CN1808588A - Optical disk apparatus - Google Patents

Optical disk apparatus Download PDF

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Publication number
CN1808588A
CN1808588A CNA2006100050928A CN200610005092A CN1808588A CN 1808588 A CN1808588 A CN 1808588A CN A2006100050928 A CNA2006100050928 A CN A2006100050928A CN 200610005092 A CN200610005092 A CN 200610005092A CN 1808588 A CN1808588 A CN 1808588A
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Prior art keywords
indicator
signal
mentioned
focus
dvd
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CN100405479C (en
Inventor
山田真一
守屋充郎
枝广泰明
高峰浩一
渡边克也
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

Disclosed is a disk device. An optical sensing head with two focuses including a focus of a recording disk of a replay thick plaque and a focus of a recording disk of a thin plaque is used to replay the information from the recording disk. The following devices are arranged, wherein, a moving device is used to make the two focuses move along the direction perpendicular to the information surface; an optical testing device is used to accept the reflected light from the recording disk; a focus deviation detecting device is used to detect the focusing state of the light beam irradiated on the information surface according to the output signal of the optical testing device; a focusing control device is used to control the focusing state of the light beam to reach the regulated state according to the output signal of the focus deviation detecting device; and a timing signal generating device is used to generate action of the focusing control device according to the output signal of the focus deviation detecting device.

Description

Optical disc apparatus
The application is that the patent No. is 02120401.2, the applying date is on July 26th, 1996, denomination of invention is divided an application for the application of " optical disc apparatus ".
Technical field
The optical disc apparatus of multiple indicator of compact disc (hereinafter referred to as CD) and digital video record dish (hereinafter referred to as DVD) etc. the present invention relates to reset.
Background technology
Optical disc apparatus is the beam condenser that laser instrument produces to be shone on the indicator in the rotation device of the signal that is write down on the playback of recorded dish.
Represented on Figure 25 is that general CD is the enlarged drawing of compact disc.Be formed with Bit String P on the indicator, these Bit Strings form each recording track.On the face of this bit that is formed with indicator, promptly on information faces, coating by vaporization has aluminium as reflectance coating.Light beam shines this dish from the lower side of figure, and the interval of recording track is that gauge is 1.6 μ m, and recording track is provided as spiral fashion.During the information that on the playback track, write down, carry out focus control, the focus of light beam is on the information faces, promptly be on the part that aluminium mirror coating is arranged, simultaneously, carry out tracking Control, the focus of this light beam is positioned on the recording track.The diameter of above-mentioned indicator is about 120mm, and its substrate thickness is 1.2mm, and in addition, the wavelength of light beam is 780nm.
In recent years, the existing indicator that has improved recording density, the digital video record dish (calling DVD in the following text) of recording digital picture data for example, below as an example that has improved the indicator of recording density, be illustrated with DVD.But, in the present invention, be not limited to this indicator as the indicator that has improved recording density.
DVD compares with above-mentioned CD, and recording density is about its 5 times, and in order to reach this recording density, its gauge is accomplished 0.74 μ m, has just improved recording density (the data number of unit length on the recording track).Corresponding to the raising of above-mentioned recording density, the wavelength decreases of light beam is to 650nm.And even indicator exists, for the information that is write down on the playback dish stably, the substrate thickness of dish will be accomplished 0.6mm, and this substrate thickness becomes thinner than CD substrate, and the diameter of dish is basic identical with the diameter that CD coils.
Below, this dish is called 1 laminar DVD, in DVD, except 1 laminar DVD, also has the indicator of structure as shown in figure 26, i.e. 2 laminar DVD, even in this 2 laminars, light beam also is from the downside irradiation, and is the same with 1 laminar DVD, from the make progress place of 0.6mm of downside the record surface of recorded information is arranged, below it is referred to as the 1st layer.On the 1st layer, use the reflectance coating of metal and so on, its reflectivity is low, and therefore, the part of light beam can see through the 1st layer to about 35%, and the 1st layer has just become the 1st record surface.On the 1st layer, clip the middle layer of 40 μ m, the face of a recorded information is arranged, below it is called the 2nd layer.By the 2nd layer of reflection, by middle layer, the 1st layer and substrate, this 2nd layer has just become the 2nd information faces again by above-mentioned the 1st layer light beam.Therefore, this information of layers 1 and 2 of just can resetting.And the 2nd layer with aluminium etc. as material, its reflectivity is about 90%.This indicator, promptly the recording capacity of 2 laminar DVD is 2 times of 1 laminar DVD.When the 1st information faces of resetting this 2 laminar DVD, the 1st information faces is carried out focus control, when resetting the 2nd information faces, focus after the 1st information faces moves on the 2nd information faces, is carried out focus control to the 2nd information faces.
In same optical disc apparatus under the situation of playback CD and DVD, because their substrate thickness difference, the optical system that playback CD uses and the optical system of playback of DVD just must be set, switch according to indicator.But, exist CD and DVD all not to be built in situation in the cartridge, and cartridge is provided with the hole of identification usefulness, differentiate the type of dish with the hole, just can not come the switchable optics system in this case according to this mark.
When once the indicator that is called as CD-R (compact disc that can write again) of record only (optical system of using corresponding to CD) when packing optical disc apparatus into, if the optical system of misuse DVD, will be corrupt, its reason is because general CD-R dish adopts the material of organic pigment class as recording film, absorptivity height for wavelength 650nm, the light of this wavelength of high absorption 650nm will be organic pigment class material damage.
As mentioned above, owing to exist CD and DVD not to be built in situation in the cartridge, and cartridge is provided with the hole of identification usefulness, differentiates the type of dish with the hole, just can not come the switchable optics system according to this mark in this case.Therefore, although be CD, when using the dvd pickup system because CD is different with the employed baseplate material of DVD, can not be from this CD playback information normally.
Summary of the invention
Purpose of the present invention is exactly in order to solve original problem, even a kind of CD or DVD that is not built in the cartridge is provided, also to coil the optical disc apparatus that kind is differentiated.
Purpose of the present invention is exactly in order to solve original problem, even provide a kind of under the situation in the indicator insertion optical disc apparatus that is called as CD-R that can only write down once, also can carry out differentiation, and can not destroy the optical disc apparatus of material of the organic pigment class of above-mentioned CD-R the dish kind of this CD-R and DVD.
For realizing above-mentioned purpose, the optical disc apparatus as the solution of the present invention 1 comprises: wavelength is the light source about 650nm; And mobile device, when being used for the information faces playback information from CD the focus of the light beam of described light emitted is moved on information faces with vertical direction; With the total reflection light amount detecting device, have: detect from catoptrical a plurality of photodetectors of the CD reflection of being loaded; The current signal of described a plurality of photodetector outputs is converted to a plurality of current-to-voltage convertors of voltage signal; With the totalizer of the voltage signal addition of described a plurality of current-to-voltage convertors output, this total reflection light amount detecting device detects from the total reflection light quantity of the CD reflection of being loaded as the output signal of described totalizer; And discriminating gear, be used for output signal at the described total reflection light amount detecting device when driving described mobile device and make described focus when the value of regulation is following by information faces, be judged as is to be the CD of the organic color material of the high-absorbility about 650nm as recording film with the wavelength, differentiated for being with the high organic color material of the absorptivity of the wavelength about 650nm during by described discriminating gear when the described CD of being loaded as the CD of recording film, do not carry out based on described light source to the information record of the described CD of being loaded and/or reset.
The solution of the present invention 2,3 provides a kind of optical disc apparatus.
Be provided with as the optical disc apparatus of the solution of the present invention 4 and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator, accept to differentiate under the situation of the catoptrical optical detection device from indicator, level that the above-mentioned optical detection device output valve when driving above-mentioned mobile device and making above-mentioned focus by information faces is lower than regulation for the discriminating gear of organic color material as the indicator of recording film perpendicular to information faces.
The optical disc apparatus of the solution of the present invention 5 is that the output signal that is provided with in the optical disc apparatus of the solution of the present invention 4 records according to above-mentioned optical detection device detects the focus offset signal pick-up unit that the focus of representing the beams focusing state on the information faces that shines departs from detection signal; Be lower than in the amplitude of above-mentioned focus offset signal detection signal under the situation of level of regulation, above-mentioned discriminating gear is differentiated the indicator of being packed into for the indicator of organic color material as recording film.
The optical disc apparatus of the solution of the present invention 6 is that the intensity when above-mentioned discriminating gear makes the intensity of light beam be lower than playback information comes indicator is differentiated in the optical disc apparatus of the solution of the present invention 4 records.
Be provided with as the optical disc apparatus of the solution of the present invention 7 and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator, accept perpendicular to information faces from indicator catoptrical optical detection device, differentiate the discriminating gear that the indicator of being packed into has the indicator of an information faces or has the indicator of two information faces; Above-mentioned optical detection device output valve when driving above-mentioned mobile device and making above-mentioned focus by information faces is lower than under the situation of level of regulation, and above-mentioned discriminating gear is differentiated for being the indicator with two information faces.
Optical disc apparatus as the solution of the present invention 8 is that the output signal that is provided with in the optical disc apparatus of the solution of the present invention 7 records according to above-mentioned optical detection device detects the focus offset signal pick-up unit that the focus of representing the beams focusing state on the information faces that shines departs from detection signal; Be lower than in the amplitude that above-mentioned focus departs from detection signal under the situation of level of regulation, above-mentioned discriminating gear is differentiated the indicator of being packed into for being the dish with two information faces.
Be provided with as the optical disc apparatus of the solution of the present invention 9 and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator perpendicular to information faces, acceptance is from the catoptrical optical detection device of indicator, the maximal value of the information playback signal amplitude of the above-mentioned optical detection device when making above-mentioned focus by information faces according to the above-mentioned mobile device of driving is differentiated the indicator that the indicator of being packed into is the thick substrate material or is approached the discriminating gear of the indicator of baseplate material.
Optical disc apparatus as the solution of the present invention 10 is the optical system of the optical system of the recorded information of playback of recorded dish as the dish usefulness of thin baseplate material in the optical disc apparatus of the solution of the present invention 1 record.
Optical disc apparatus as the solution of the present invention 11 is in the solution of the present invention 1,2, and the output valve at above-mentioned optical detection device in the optical disc apparatus of 3,4,7 or 9 records surpasses under the situation of setting, and the control mobile device reduces the focus translational speed.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 12, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, represent that according to the output signal detection of above-mentioned optical detection device the focus of the beams focusing state on the information faces that shines departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action; Drive above-mentioned mobile device and make focus away from indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, and above-mentioned focus control device is failure to actuate; Drive above-mentioned mobile device and make above-mentioned focus near indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 13, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, represent that according to the output signal detection of above-mentioned optical detection device the focus of the beams focusing state on the information faces that shines departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action; Driving above-mentioned mobile device makes focus near indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, when not reading information, drive above-mentioned mobile device and make above-mentioned focus away from indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action.
Be to use the optical sensing head of two focuses of focus of the dish of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 14, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, represent that according to the output signal detection of above-mentioned optical detection device the focus of the beams focusing state on the information faces that shines departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action, the indicator that differentiation is packed into is the indicator of thick substrate material or the discriminating gear of the indicator of thin baseplate material; Under situation for the indicator of thick substrate material differentiated the indicator of being packed into by above-mentioned discriminating gear, drive above-mentioned mobile device to make above-mentioned focus near indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 15, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, represent that according to the output signal detection of above-mentioned optical detection device the focus of the beams focusing state on the information faces that shines departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action, the indicator that differentiation is packed into is the indicator of thick substrate material or the discriminating gear of the indicator of thin baseplate material; At above-mentioned discriminating gear is the indicator differentiation of being packed into to approach under the situation of the indicator of baseplate material, drives above-mentioned mobile device to make above-mentioned focus away from indicator, and the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 16, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, represent that according to the output signal detection of above-mentioned optical detection device the focus of the beams focusing state on the information faces that shines departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action, the indicator that differentiation is packed into is the indicator of thick substrate material or the discriminating gear of the indicator of thin baseplate material; Under situation for the indicator of thick substrate material differentiated the indicator of being packed into by above-mentioned discriminating gear, drive above-mentioned mobile device to make above-mentioned focus near indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action; At above-mentioned discriminating gear is the indicator differentiation of being packed into to approach under the situation of the indicator of baseplate material, drives above-mentioned mobile device to make above-mentioned focus away from indicator, and the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information with playback thick substrate material as the optical disc apparatus of the solution of the present invention 17, be provided with mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces, accept from dish catoptrical have the 1st and the 2nd photosensitive region optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Above-mentioned the 1st photosensitive region of above-mentioned optical detection device is accepted the reflected light in centre, and above-mentioned the 2nd photosensitive region is accepted the reflected light at peripheral position; Drive above-mentioned mobile device, make above-mentioned two focuses by information faces, above-mentioned discriminating gear is differentiated the indicator that the indicator of being packed into is the thick substrate material according to the signal that detects on the above-mentioned the 1st and the 2nd photosensitive region or is approached the indicator of baseplate material.
The optical disc apparatus of the solution of the present invention 18 be the suitable beam focus of the level detection of the information playback signal that detects from above-mentioned optical detection device of the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 17 is put down in writing near indicator has reached information faces, and the indicator that the signal that detects on the 1st and the 2nd photosensitive region according to this moment is differentiated the thick substrate material still is the indicator of thin baseplate material.
The optical disc apparatus of the solution of the present invention 19 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 18 is put down in writing is reaching on the indicator near the information faces according to the suitable beam focus that recently detects of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device.
The optical disc apparatus of the solution of the present invention 20 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 17 is put down in writing comprises the division arithmetic device of removing the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the reception light quantity AS1Lp of the 1st photosensitive region when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the measuring device of the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information playback signal; According to the value of AS2Lp with (value of AS1Lp * ENVp) recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material.
The optical disc apparatus of the solution of the present invention 21 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 17 is put down in writing comprises from the output signal of the 1st photosensitive region with from the additive operation device of the output signal addition of the 2nd photosensitive region, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the reception light quantity AS1Lp of the 1st photosensitive region when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) with (value of AS1Lp * ENVp) recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information with playback thick substrate material as the optical disc apparatus of the solution of the present invention 22, be provided with mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces, accept from dish the catoptrical the 1st and the 2nd optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Above-mentioned the 2nd optical detection device is accepted than above-mentioned the 1st optical detection device reflected light of wide region more; The signal that above-mentioned discriminating gear makes above-mentioned two focuses be detected by the above-mentioned the 1st and the 2nd optical detection device by information faces according to the above-mentioned mobile device of driving is differentiated the indicator that the indicator of being packed into is the thick substrate material or is approached the indicator of baseplate material.
The optical disc apparatus of the solution of the present invention 23 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 22 is put down in writing uses the suitable beam focus of the level detection of the information playback signal that is detected by above-mentioned optical detection device reaching on the dish near the information faces, and still is the indicator of thin baseplate material according to the indicator that the signal that the 1st and the 2nd optical detection device of this moment detects is differentiated the thick substrate material.
The optical disc apparatus of the solution of the present invention 24 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 23 is put down in writing is reaching on the dish near the information faces according to the suitable beam focus that recently detects of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device.
The optical disc apparatus of the solution of the present invention 25 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 22 is put down in writing comprises the division arithmetic device of removing the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to the value of AS2Lp with (it is the indicator of thick substrate material or the indicator of thin baseplate material that the ratio of the value of AS1Lp * ENVp) is not differentiated the indicator of being packed into.
The optical disc apparatus of the solution of the present invention 26 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 22 is put down in writing comprises from the output signal of the 1st optical detection device with from the additive operation device of the output signal addition of the 2nd optical detection device, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) with (value of AS1Lp * ENVp) recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material.
As the optical disc apparatus of the solution of the present invention 27 are optical disc apparatus of any one indicator of the light beam of the irradiation line focus indicator resetting indicator with an information faces and have two information faces, be provided with mobile device that the focus that makes light beam moves along the direction perpendicular to information faces, accept from dish catoptrical have the 1st and the 2nd photosensitive region optical detection device, differentiate the discriminating gear that the indicator of being packed into has the indicator of an information faces or has the indicator of two information faces; Above-mentioned the 1st photosensitive region of above-mentioned optical detection device is accepted the reflected light in centre, and above-mentioned the 2nd photosensitive region is accepted the reflected light at peripheral position; Drive above-mentioned mobile device, make above-mentioned focus by information faces, above-mentioned discriminating gear is differentiated the indicator that indicator with an information faces still has two information faces according to the signal that detects on the above-mentioned the 1st and the 2nd photosensitive region.
The optical disc apparatus of the solution of the present invention 28 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 27 is put down in writing uses the level detection beam focus of the information playback signal that is detected by above-mentioned optical detection device to reach near the information faces, and the signal that detects on the 1st and the 2nd photosensitive region according to this moment is differentiated the indicator that indicator with an information faces still has two information faces.
The optical disc apparatus of the solution of the present invention 29 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 28 is put down in writing has reached near the information faces according to the beam focus of detection recently of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device.
The optical disc apparatus of the solution of the present invention 30 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 27 is put down in writing comprises the division arithmetic device of removing the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the reception light quantity AS1Lp of the 1st photosensitive region when the above-mentioned mobile device of mensuration driving makes above-mentioned focus make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the measuring device of the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information playback signal; According to the value of AS2Lp with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces.
The optical disc apparatus of the solution of the present invention 31 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 27 is put down in writing comprises from the output signal of the 1st photosensitive region with from the additive operation device of the output signal addition of the 2nd photosensitive region, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the reception light quantity AS1Lp of the 1st photosensitive region when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned focus by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) is with (dish of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces.
As the optical disc apparatus of the solution of the present invention 32 are optical disc apparatus of any one indicator of the light beam of the irradiation line focus indicator resetting indicator with an information faces and have two information faces, be provided with mobile device that above-mentioned focus is moved along the direction perpendicular to information faces, accept from dish the catoptrical the 1st and the 2nd optical detection device, differentiate the discriminating gear that the indicator of being packed into has the indicator of an information faces or has the indicator of two information faces; Above-mentioned the 2nd optical detection device is accepted than above-mentioned the 1st optical detection device reflected light of wide region more; Above-mentioned discriminating gear is differentiated the indicator that indicator with an information faces still has two information faces according to driving signal that above-mentioned mobile device makes above-mentioned two focuses be detected by the above-mentioned the 1st and the 2nd optical detection device by information faces.
The optical disc apparatus of the solution of the present invention 33 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 32 is put down in writing uses the level detection beam focus of the information playback signal that is detected by above-mentioned optical detection device to reach near the information faces, and differentiates according to the signal that the 1st and the 2nd optical detection device of this moment detects that the indicator of being packed into has the indicator of an information faces or the indicator with two information faces.
The optical disc apparatus of the solution of the present invention 34 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 33 is put down in writing has reached near the information faces according to the focus that recently detects the light beam that is suitable for indicator of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device.
The optical disc apparatus of the solution of the present invention 35 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 32 is put down in writing comprises the division arithmetic device of removing the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the above-mentioned mobile device of mensuration driving makes above-mentioned focus make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to the value of AS2Lp with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces.
The optical disc apparatus of the solution of the present invention 36 is that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 32 is put down in writing comprises from the output signal of the 1st optical detection device with from the additive operation device of the output signal addition of the 2nd optical detection device, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned focus by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) is with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 37, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, the dish that differentiation is packed into is the indicator of thick substrate material or the discriminating gear of the indicator of thin baseplate material, drive the information faces pick-up unit that focus that above-mentioned mobile device makes two above-mentioned focuses detect the light beam that is suitable for coiling by information faces by the output signal of above-mentioned optical detection device has reached information faces; The indicator that the differentiation recently of the maximal value ASLmax of the output signal of the above-mentioned optical detection device when the output signal level ASLp of the aforementioned lights pick-up unit when detecting information faces according to above-mentioned information faces pick-up unit makes two above-mentioned focuses by information faces with the above-mentioned mobile device of driving is packed into is the indicator of thick substrate material or the indicator of thin baseplate material.
The optical disc apparatus of the solution of the present invention 38 is that the above-mentioned information faces pick-up unit in the optical disc apparatus that the solution of the present invention 37 is put down in writing has reached near the information faces according to the focus that recently detects the light beam that is suitable for indicator of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information from the indicator with playback thick substrate material as the optical disc apparatus of the solution of the present invention 39, record mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces, accept from indicator catoptrical optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Driving above-mentioned mobile device makes two above-mentioned focuses pass through information faces, obtain the maximal value AS1Lmax of output valve of above-mentioned optical detection device and the maximal value ENVmax of information playback signal amplitude, recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material according to this ENVmax and AS1Lmax.
Be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information as the optical disc apparatus of the solution of the present invention 40, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, the focus that detects the beams focusing state on the information faces that shines according to the output signal of above-mentioned optical detection device departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the focus that detects the light beam that is suitable for indicator according to the output signal of above-mentioned optical detection device has reached near the information faces pick-up unit the information faces; Above-mentioned focus control device comprises the adjustable multiplying arrangement of magnification that the above-mentioned focus of amplification departs from the output signal of pick-up unit; Drive above-mentioned mobile device and make two above-mentioned focuses by information faces, the output valve of the above-mentioned optical detection device during according to the information faces detection signal that produces above-mentioned information faces pick-up unit is set the magnification of above-mentioned multiplying arrangement.
Optical disc apparatus as the solution of the present invention 41 is in the optical disc apparatus that the solution of the present invention 40 is put down in writing, set after the magnification of above-mentioned multiplying arrangement, the output signal that detects above-mentioned multiplying arrangement reaches the level of regulation, makes above-mentioned focus control device action.
The optical disc apparatus of the solution of the present invention 42 is that the above-mentioned information faces pick-up unit in the optical disc apparatus that the solution of the present invention 40 is put down in writing has reached near the information faces according to the focus that recently detects the light beam that is suitable for indicator of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device.
As the optical disc apparatus of the solution of the present invention 43, in the solution of the present invention 17,22,27,32,37, or in 39 optical disc apparatus of being put down in writing, control above-mentioned mobile device and make twice of each focus by after the information faces indicator of being packed into being differentiated.
As the optical disc apparatus of the solution of the present invention 44, in the solution of the present invention 17,22,27,32,37, or 39 in the optical disc apparatus of being put down in writing, and controls above-mentioned focus control device and makes above-mentioned focus by during the information faces, makes the vibration a little on perpendicular to the direction of recording track of above-mentioned focus.
As the optical disc apparatus of the solution of the present invention 45, in the solution of the present invention 17,22,27,32,37, or 39 in the optical disc apparatus of being put down in writing, and surpasses under the situation of the value that sets in the output valve of above-mentioned optical detection device, controls the translational speed that above-mentioned mobile device makes it to reduce above-mentioned focus.
Description of drawings
Fig. 1 is the block scheme according to the optical disc apparatus of the 1st embodiment of the present invention;
Fig. 2 represents is the position (be respectively figure (a), (b), (c), (d) and (e)) of FE signal, AS1 signal, AS1L signal, ENV signal and focal point F among above-mentioned the 1st embodiment;
Fig. 3 is the DVD1 for the differentiation that the indicator among the 1st embodiment is described, DVD2, and CD, the various situations of CD-R (be respectively figure (a), (b), (c), (d) oscillogram of) ENV signal, AS1L signal;
Fig. 4 is the block scheme according to the optical disc apparatus of the 2nd embodiment of the present invention;
Fig. 5 is the block scheme of the optical disc apparatus under the life cycle measuring circuit situation in the foregoing description 2;
Fig. 6 is the block scheme according to the optical disc apparatus of the 3rd embodiment of the present invention;
Fig. 7 is the mode chart that has the optical system of two focuses in the foregoing description 3;
Fig. 8 is the DVD1 in the foregoing description 3, DVD2, the various situations of CD (be respectively figure (a), (b), (c) oscillogram of) FE signal, ENV signal;
Fig. 9 is the DVD1 for the differentiation of the indicator in explanation the foregoing description 3, DVD2, and CD, the various situations of CD-R (be respectively figure (a), (b), (c), (d) oscillogram of) ENV signal, AS1L signal;
Figure 10 is the block scheme according to the optical disc apparatus of the 4th embodiment of the present invention;
Figure 11 is the mode chart of the photodetector 411 in the foregoing description 4;
Figure 12 is the process flow diagram of action of the device of the foregoing description 4;
Figure 13 is the DVD1 in the foregoing description 4, DVD2, and CD, the various situations of CD-R (be respectively figure (a), (b), (c) oscillogram of) FE signal, ENV signal, AS1L signal, AS1 signal, ENV/AS1;
Figure 14 is the process flow diagram of first half of action of the device of the foregoing description 4;
Figure 15 is the process flow diagram of latter half of action of the device of the foregoing description 4;
Figure 16 is for DVD, the oscillogram of the action of the optically focused camera lens 170 in the various situations of CD (being respectively figure (a), (b)) expression the foregoing description 4;
Figure 17 is the oscillogram for the FE signal of the action of the amplifier 453 in explanation the foregoing description 4;
Figure 18 is the block scheme that uses the optical disc apparatus under two photodetector situations in the foregoing description 4;
Figure 19 is the mode chart of two photodetectors in the foregoing description 4;
Figure 20 is the block scheme according to the optical disc apparatus of the 5th embodiment of the present invention;
Figure 21 represents the position of optically focused camera lens 170 and the oscillogram of FE signal (figure (a), (b)) for explanation the foregoing description 5; And the circuit block diagram (figure (c), (d)) of expression signal processing circuit 500 and CD usefulness information playback circuit thereof;
Figure 22 represents the position of optically focused camera lens 170 and the oscillogram of FE signal (figure (a), (b)) for explanation the foregoing description 5;
Figure 23 described is value Z and the relation of indicator classification and the method for using this relation to differentiate in the foregoing description 3;
What Figure 24 was represented is that indicator 100 is 1 laminar DVD among the embodiment 4,2 laminar DVD, and the ENV/ASL under the situation of CD when reaching peaked state DVD concern ((a)) with focus and CD with the position of focus and information faces; And from folded light beam ((b)) facing to the information faces of the indicator 100 of photodetector 411;
Figure 25 is the mode chart of the CD in original example;
Figure 26 is the mode chart of general 2 laminar DVD.
Embodiment
Embodiment 1
Below with Fig. 1 optical disc apparatus according to embodiments of the invention 1 is described.
The optical disc apparatus of present embodiment 1 is to 1 laminar DVD, 2 laminar DVD, the device that CD and CD-R differentiate.In Fig. 1, the 100th, indicator, this indicator are carried on the carriage 149; The 147th, microcomputer (to call microcomputer in the following text), when indicator 100 was carried on the carriage 149, this micom drives motor 118 moved carriage 149, thereby indicator 100 was loaded in the rotating shaft 102 of motor 101.
Laser instrument 105 (wavelength 650nm), coupling camera lens 106, polarized light beam splitter 107,1/4 wavelength plate 108, completely reflecting mirror 109, photodetector 111, motor 128 and actuator 112 are installed on transfer bed 104,127, with the handover motor 103 of linear motor for example etc. this transfer bed 104 is moved along the radial direction of indicator 100.
Go out by the beam emissions that the laser instrument 105 that is installed on the above-mentioned transfer bed 104 produces, form after the directional light by coupling camera lens 106, by polarized light beam splitter 107 and 1/4 wavelength plate 108; By completely reflecting mirror 109 reflections, be radiated on the information faces of indicator 100 by 110 focusing of optically focused camera lens then again.Optically focused camera lens 110 and actuator 112 are used under the situation of playback of DVD; Under the situation of playback CD, driving motor 128 switches to CD to system with optically focused camera lens 126 and actuator 127, to substitute actuator 112 and the optically focused camera lens 110 that above-mentioned DVD uses.In the device of original C D special use, CD uses the laser instrument of wavelength as 780nm, and the optically focused camera lens 126 that above-mentioned CD uses is designed to the camera lens 105 of wavelength 650nm, and has considered the substrate thickness 1.2mm of CD.
From the reflected light of the information faces of indicator 100 reflection by behind the optically focused camera lens 110, by completely reflecting mirror 109 reflections, again by 1/4 wavelength plate 108, polarized light beam splitter 107, detector lens 113 and cylinder camera lens 116, shine by on 4 photodetectors of having cut apart 111.Optically focused camera lens 110 is installed in the moving part of actuator 112, and actuator 112 constitutes with permanent magnet with permanent magnet and tracking with coil, focusing by focusing on coil, tracking.Therefore, in case power amplification circuit 133 is added in voltage on the coil (not shown) of focusing usefulness of actuator 112, electric current just flows through coil (focus on and use coil), and being focused on the magneticaction of using the permanent magnet (not shown), condenser light 110 is just gone up in the direction vertical with the face of indicator 100 (above-below direction of figure) and is moved.Like this, just control optically focused camera lens 110, the focus of light beam is on the information faces of indicator 100 all the time according to the focus error signal that departs from of the information faces of focus and the indicator of expression light beam.
In case power amplification circuit 136 is added in voltage on the coil (not shown) of tracking usefulness of actuator 112, electric current just flows through this coil, and is followed the tracks of the magneticaction with the permanent magnet (not shown).Optically focused camera lens 110 is just gone up in direction (left and right directions of figure) promptly vertical with track on the indicator 100 on the radial direction of indicator 100 and is moved.
Be transformed to each electric current from the reflected light on the above-mentioned photodetector 111 of being irradiated to of indicator by 4 photodetectors of cutting apart 111, and be input to I/V transducer 114,115,119,120 respectively.I/V transducer 114,115,119,120 is the current transformation of being imported corresponding voltage; Totalizer 121,122,123,124 from 4 above-mentioned I/V transducers 114,115, two input signals of each of 119,120 are added up, and differential amplifier 125 is delivered in per two of its output separately, 117, the difference of the voltage of the output that two input voltages of differential amplifier 117 computings are above-mentioned totalizer 123,124, and export the value that computing obtains.
Optical system shown in Figure 1 constitutes the focus error detection mode that generally is referred to as Astigmatism methord, therefore, the output of differential amplifier 117 has just become the focus error signal that departs from (calling the FE signal in the following text) of the information faces of the focal point of expression light beam 150 and indicator 100, this FE signal is through phase compensating circuit 130, switch 131 and totalizer 132 are sent to power amplification circuit 133, this power amplification circuit 133 is added to voltage the focusing of actuator 112 with on the coil (not shown), like this, phase compensating circuit 130 is exactly the circuit that makes the focus control system stability, drive optically focused camera lens 110 according to above-mentioned FE signal, or driving optically focused camera lens 126 is on the information faces focus of light beam all the time under the situation that switches to optically focused camera lens 126.
The difference of the voltage of the output that two input voltages of above-mentioned differential amplifier 125 computings are above-mentioned totalizer 121,122, and export the value that computing obtains.Optical system shown in Figure 1 constitutes the tracking error detection mode that generally is referred to as the method for recommending.Therefore, the output of differential amplifier 125 has just become the tracking error signal that departs from (calling the TE signal in the following text) of the track of the focal point of expression light beam 150 and indicator 100, this TE signal is sent to power amplification circuit 136 through switch 134, phase compensating circuit 135, and this power amplification circuit 136 is added to voltage the tracking of actuator 112 with on the coil (not shown).Like this, phase compensating circuit 135 is exactly the circuit that makes tracking control system stable, drive optically focused camera lens 110 according to above-mentioned TE signal, or the focus of light beam is positioned on the above-mentioned recording track all the time at driving optically focused camera lens 126 under the situation that switches to optically focused camera lens 126.
Totalizer 148 be output into the signal that whole outputs of above-mentioned photodetector 111 are added up, this signal is exactly the signal of expression from the total reflection light quantity of indicator.Following this output signal is called the AS1 signal, this signal be with the byte on the indicator have or not and the signal that changes, AS1 signal of this expression total reflection light quantity is sent to envelope detected circuit 143 and is the signal processing circuit (not shown) of demodulating information.
143 outputs of above-mentioned envelope detected circuit are by the signal level of the alternating component that byte produced on the indicator, below this output signal are referred to as the ENV signal.Low-pass filter 165 (to call LPF in the following text) is removed by the alternating component that byte was produced on the indicator from above-mentioned AS1 signal, below the AS1 signal by this LPF165 is called the AS1L signal.Above-mentioned AS1L signal, ENV signal and FE signal are by analog-to-digital converter 142,144, and 140 (to call the A/D transducer in the following text) are transformed to digital signal, and deliver in the microcomputer 147.
The following describes action according to the optical disc apparatus of embodiment 1.
When being loaded into indicator 100 on the carriage 149, above-mentioned microcomputer 147 is installed to indicator 100 in the rotating shaft 102 of motor 101 with regard to driving motor 118.
Next, microcomputer 147 is set to D/A transducer 145 to setting, make transfer bed 104 move to the inner periphery of indicator 100 through power amplification circuit 139 by transferring motor 103, driving motor 128 switches to optically focused camera lens 110 and the actuator 112 that DVD uses to optically focused camera lens and actuator simultaneously.
Further, microcomputer 147 makes motor 101 rotations.The revolution of defined when the revolution of motor is made as the information of resetting its inner periphery in DVD; When motor 101 reached the revolution of defined, this motor 101 was delivered to the terminal a of microcomputer 147 to the OK signal, and when this OK signal was sent here, microcomputer 147 was delivered to drive circuit for laser 129 to instruction through terminal b, made laser instrument be in the emission state that penetrates light.In addition, microcomputer 147 is provided with emissive porwer through D/A transducer 146 at drive circuit for laser 129.And even be loaded under the situation of this optical disc apparatus at the indicator of CD-R, the emissive porwer of this laser instrument also is to destroy the low intensity value of the information of this CD-R dish.
Further, microcomputer 147 is set numerical value in D/A transducer 141, and after totalizer 132 and power amplification circuit 133 temporarily lower optically focused camera lens 110, goes up at leisure again, that is: away from after the dish, shift near at leisure again.At this moment, switch 131,134 is in the state of disconnection, so can not be according to the focusing of FE signal and TE signal driving actuator 112 with coil and tracking coil.And, during optically focused camera lens 110 is moved, microcomputer 147 is taken into above-mentioned FE signal, AS1L signal and ENV signal through A/D transducer 140, LPF165 and A/D transducer 142 and A/D transducer 144 respectively, it is 1 laminar DVD that this microcomputer 147 is differentiated the indicator 100 of being packed in this optical disc apparatus according to the FE signal that is taken into, AS1L signal and ENV signal, 2 laminar DVD, CD, and any indicator of CD-R.
Carry out after the above-mentioned differentiation, at above-mentioned indicator of packing into is under the situation of CD-R, because might destroy the information that is write down on the indicator 100, so, above-mentioned microcomputer 147 just drives above-mentioned motor 118 and comes movable support bracket 149, indicator 100 is got rid of from device gone.At above-mentioned indicator of packing into is under the situation of CD, above-mentioned microcomputer 147 driving motors 128, and actuator and optically focused camera lens switched to actuator 127 and the optically focused camera lens 126 that CD uses.
Then, above-mentioned microcomputer 147 control drive circuit for laser 129, and be carry out the CD of above-mentioned discrimination result or DVD any according to the indicator of packing into, the emissive porwer of above-mentioned laser instrument 105 is set at the value that corresponds respectively to CD or DVD.And the output valve of D/A transducer 141 made zero, through totalizer 132 switch 131,134 closures, form each loop like this, with power amplification circuit 133, above-mentioned actuator 112 is controlled in 136 output, thereby carries out focus control and tracking Control, and the information that is write down on the playback indicator 100.
Like this, just under newly being encased in situation in the rotating shaft 102 of motor 101, indicator 100 just uses the differentiation of the indicator of microcomputer 147, therefore, for example temporarily stop after the playback of information of indicator, under the situation that begins again to reset, with regard to the differentiation of no longer coiling, thereby can shorten the leading time that begins above-mentioned playback time again.
FE signal, AS1L signal and ENV signal are described below.
The oscillogram of each signal of optically focused camera lens 110 when the state that lowers slowly rises when having represented among Fig. 2 (a)～(e) to be encased in 1 laminar DVD (DVD1) in this optical disc apparatus.In Fig. 2 (a)～(e), the longitudinal axis is represented the level of signal, the transverse axis express time.Fig. 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d) and Fig. 2 (e) represent the position of FE signal, AS1 signal, AS1L signal, ENV signal and focal point F respectively.When the focus of the light beam that shines indicator is aluminium mirror coating by the face that has write down information, above-mentioned FE signal, AS1 signal, AS1L signal and each signal of ENV signal change, when the consistent time t1 of the information faces of the position of the focus of above-mentioned light beam and dish, above-mentioned FE signal is zero.At this, the waveform of the above-mentioned FE signal during generally the information faces of the focus of light beam by indicator is referred to as the S curve.Above-mentioned AS1 signal slowly increases with the information faces that the focus of light beam shifts near indicator, and slowly reduces from the information faces of indicator far away with the focus of light beam, and this changed along with the having or not of byte on the indicator; Above-mentioned AS1L signal becomes the level according to the above-mentioned AS1 signal of the byte on the dish is changed the signal average; Above-mentioned ENV signal is the signal of expression according to the level variation of the reflection light quantity that has or not of the byte on the dish; The position of the focal point F of the light beam that the waveform of Fig. 2 (e) is represented is decided by the signal level that microcomputer 147 outputs to D/A transducer 141.
Here, shown in the waveform of Fig. 2 (e), microcomputer 147 makes the position of the focal point F of light beam move lentamente during time t2 at time t0, and this is to make the variation of signal level slow because of moving slowly, just can correctly carry out the mensuration of above-mentioned FE signal, AS1L signal and ENV signal.And during between time t0～time t2 as the AS1L signal surpass reference value W during.In this period above-mentioned AS1L signal surpass reference value W be because this period inner light beam focus be in indicator information faces near.Therefore, time t0～time t2 during be exactly can correctly to carry out the mensuration of each signal because move slowly the position of the focal point F of light beam and can shorten time of differentiating indicator during.
Below, according to the result who detects above-mentioned FE signal, AS1L signal, ENV signal the mode that the indicator that undertaken by microcomputer 147 is differentiated is described.
Above-mentioned microcomputer 147 calculates the maximal value of the above-mentioned FE signal, AS1L signal and the ENV signal that are taken into.
Expression is above-mentioned ENV signal and the AS1L signal of optically focused camera lens 110 when slowly rising among Fig. 3 (a)～(d), and in Fig. 3 (a)～(d), the longitudinal axis is represented signal level, the transverse axis express time.The situation of Fig. 3 (a) expression 1 laminar DVD (being designated as DVD1); The situation of Fig. 3 (b) expression 2 laminar DVD (being designated as DVD2); The situation of Fig. 3 (c) expression CD; The situation of Fig. 3 (d) expression CD-R.
In the waveform of Fig. 3 (a), Kenv and Kas are the ENV signal during the mobile optically focused camera lens 110 and the maximal value of AS1L signal; Equally, Fig. 3 (b), the Lenv among Fig. 3 (c) and Fig. 3 (d), Las, Menv, Mas, Nenv, Nas also are the maximal values of respective signal.
The level of above-mentioned ENV signal and AS1L signal is a maximal value with 1 laminar DVD (DVD1), then is minimum value with CD-R.The ENV signal of 2 laminar DVD (DVD2) and the level Lenv of AS1L signal, Las is than these values (Kenv of 1 laminar DVD (DVD1), Kas) low is because the 1st layer the reflectivity of 2 laminar DVD (DVD2) is about 35%, and this value is lower than the reflectivity of 1 laminar DVD (DVD1) about 90%.
(DVD1, (Kenv, Lenv) low is because the ENV signal of this CD is to measure with the optical system that DVD uses to these values DVD2) to the level Menv of the ENV signal of CD than DVD.
In addition, the ENV signal of CD and CD-R and AS1L signal (Menv and Nenv, Mas and Nas) have difference to be because the absorptivity of the 650nm of CD-R is bigger than the absorptivity of CD.
In the waveform of Fig. 3 (a), Kenv and Kas are the ENV signal during the mobile optically focused camera lens 110 and the maximal value of AS1L signal; Equally, Fig. 3 (b), the Lenv among Fig. 3 (c) and Fig. 3 (d), Las, Menv, Mas, Nenv, Nas also are the maximal values of respective signal.
When calculating the maximal value of above-mentioned FE signal, AS1L signal and ENV signal, microcomputer 147 stores the Pas that satisfies Nas＜Pas＜Mas, Nas＜Pas＜Las and Nas＜Pas＜Kas relation in advance, and the maximal value of AS1L signal and Pas comparison, under the maximal value of the AS1L signal situation littler than Pas, it is CD-R that the indicator of being packed into is differentiated, at this indicator is under the situation of CD-R, and driving motor 118 and carriage 149 is moved discharges dish 100 from device.
Then, microcomputer 147 computing Kenv/Kas, Lenv/Las, Menv/Mas, Nenv/Nas, here the peaked reason of removing ENV with the maximal value of AS1L signal is the discrete peaked influence to the ENV signal for the emissive porwer of the reflectivity of absorbing recording dish 100 and laser instrument 105.Experiment obtains, and under 1 laminar DVD (DVD1) and 2 laminar DVD (DVD2), this value is approximately 6, and under the situation of CD, is approximately 2.Therefore, if above-mentioned value greater than under 4 the situation, microcomputer 147 just is judged as DVD to indicator, this is worth less than under 4 the situation, then is judged as CD., if the magnification of ENV signal is different with the ASL signal, because at this moment the difference as a result of division arithmetic will change fiducial value according to magnification.
The indicator of being packed in this optical disc apparatus is under the situation of CD, and microcomputer 147 switches to actuator 127 and the optically focused camera lens 126 that CD uses to actuator and optically focused camera lens with regard to driving motor 128.
The indicator of being packed in this optical disc apparatus is under the situation of DVD, microcomputer 147 stores the Qenv that satisfies Lenv＜Qenv＜Kenv relation in advance, and the ENV signal measured and the value of this Qenv compared, differentiate 1 laminar DVD (DVD1) or 2 laminar DVD (DVD2) according to its result relatively.
In the present embodiment, be the differentiation of carrying out 1 laminar DVD (DVD1) and 2 laminar DVD (DVD2) with the maximal value of ENV signal, still, also can differentiate with the maximal value of the amplitude of FE signal or the maximal value of AS1L signal.This is the same with the reason that produces difference in the level of ENV signal, that is: because 1 laminar DVD is different with the reflectivity of 2 laminar DvD, and make the level of amplitude of FE signal or the level of AS1L signal produce difference.
In embodiment 1, be that the level with the AS1L signal carries out the differentiation of CD-R, still, also can differentiate with the level of FE signal or the level of ENV signal.This be because according to the situation of AS1L signal under same reason, promptly, make the FE signal of CD-R or the level of ENV signal compare lower with CD because the absorptivity of CD and CD-R is different.
In present embodiment 1, the differentiation of CD and DVD is to carry out according to the maximal value of removing the ENV signal with the maximal value of AS1L, experiment shows, because the maximal value of the ENV signal of 2 laminar DVD is greater than the value of the Shot Detection that should use with CD and with the maximal value of the ENV signal of the CD of DVD Shot Detection, so, can be according to the maximal value cause 1 laminar DVD of this ENV signal and 2 laminar DVD antiradar reflectivities different, DVD and CD because of not using the different of output that the only detector lens of its substrate thickness is detected, the absorptivity of CD and CD-R different are differentiated 1 laminar DVD, 2 laminar DVD, CD and CD-R.Like this, under the situation about differentiating according to the maximal value of ENV signal, owing to do not carry out division arithmetic, the processing of microcomputer 147 just can be differentiated simply.
In present embodiment 1, also can reduce the emissive porwer of laser instrument 105 earlier, as whether being the differentiation of CD-R, after optically focused camera lens 110 the 1st time moves the CD-R that really admits a fault to the direction vertical with indicator, again the emissive porwer of laser instrument 105 is improved, carry out the 2nd time of the vertical direction of the indicator of optically focused camera lens 110 is moved, carry out the differentiation of DVD, CD.At this moment, owing to can improve the level that detection signal in contrast to noise by the emissive porwer that improves laser instrument, so, just can improve the precision of differentiation widely.
In present embodiment 1, the optical system of using DVD to use is carried out the differentiation of indicator, and still, also the optical system that can use CD to use is differentiated., at this moment, because the magnitude relationship of ENV signal, FE signal is just in time conversely, so, must its decision condition of change.
In present embodiment 1, be that optically focused camera lens 110 is slowly shifted near after indicator 100 temporarily zooms out, instrumentation FE signal, ENV signal and AS1L signal at this moment, but slowly zoom out again after also can temporarily shifting near indicator 100 to optically focused camera lens 110, come instrumentation each above-mentioned signal at this moment, can both obtain and above-mentioned same effect.
As mentioned above, optical disc apparatus according to present embodiment 1 is a maximal value of measuring AS1L signal and ENV signal, the value that the maximal value of removing the ENV signal with the maximal value of AS1L signal is obtained is compared with predetermined reference value again, so, can differentiate the DVD of thin substrate thickness and the DVD of thick substrate thickness.
Because the maximal value of AS1L signal is compared with predetermined reference value, so, can enough simple formations differentiate the CD-R indicator.
Because the intensity when falling the intensity of light beam than the information of playback indicator is low, so, even the indicator of being packed into is CD-R, when the differentiation indicator, also can not destroy the information of indicator.
Because the maximal value of ENV signal amplitude is compared with predetermined reference value, because the maximal value of above-mentioned ENV signal is lower than the level of regulation, so can enough simple formations differentiate 1 laminar DVD and 2 laminar DVD.
Owing to measure the maximal value of EVN signal amplitude, and its result compared with predetermined reference value, so this just can enough simple formations differentiate substrate thickness thin DVD and the thick DVD of substrate thickness.
Because the optical system with the thin indicator of substrate is carried out the differentiation of indicator, so, when the indicator that the substrate thickness of packing into approaches, just can shorten the information time before of energy playback of recorded dish.
Because in case the level of AS1L signal reaches more than the reference value W, the translational speed of optically focused camera lens 110 just slows down, this just makes the level of AS1L signal, ENV signal and FE signal become slow, therefore, microcomputer 147 just can obtain the correct maximal value of the amplitude of AS1L signal, ENV signal and FE signal, thereby can improve the reliability that indicator is differentiated.
In embodiment 1, be to carry out the differentiation of CD-R with the maximal value of AS1L signal, still, also can differentiate with the maximal value of the amplitude of FE signal.This is because the low same reason of level of the AS1L signal of the level ratio CD of the AS1L signal of CD-R, makes the level of FE signal amplitude of level ratio CD of amplitude of FE signal of CD-R lower.Therefore, even in this case, also can obtain the same effect under the situation with above-mentioned use AS1L signal.
In the present embodiment, be the differentiation of carrying out 1 laminar DVD and 2 laminar DVD with the maximal value of ENV signal, still, also can differentiate with the maximal value of FE signal or the maximal value of AS1L signal.This is the same with the reason that produces difference in the level of ENV signal amplitude, under 1 laminar DVD and 2 laminar DVD situations, also produces difference in the maximal value of AS1L signal.Therefore, even in this case, also can obtain with above-mentioned use ENV RST under same effect.
Embodiment 2
The 2nd embodiment of the present invention below is described.
Fig. 4 is the block scheme according to the optical disc apparatus of the 2nd embodiment of the present invention.In Fig. 4,, carry out the differentiation (, can not carry out the differentiation of 1 laminar DVD and 2 laminar DVD) of DVD and CD with present embodiment 2 with the same part of same symbolic representation in the foregoing description 1.
In the optical disc apparatus according to present embodiment 2, new additional parts are bandpass filter 160 and comparer 161 in the formation of the optical disc apparatus of the foregoing description 1, and bandpass filter 160 can only make the signal of assigned frequency pass through.Input signal surpasses under the situation of setting, and comparer 161 is just exported high level signal.Therefore, can whether be that high level is differentiated the signal that whether records the passband of bandpass filter 160 on indicator 100 with the output valve of comparer 161.At this, the passband of above-mentioned bandpass filter 160 is set near the 4MHz.
The following describes action according to the optical disc apparatus of embodiment 2.
The same with the above embodiments 1, when being loaded into indicator 100 on the carriage 149, microcomputer 147 is installed to indicator 100 in the rotating shaft 102 of motor 101 with regard to driving motor 118.
Next, microcomputer 147 is set to D/A transducer 145 to setting, make transfer bed 104 move to the inner periphery of indicator 100 through power amplification circuit 139 by transferring motor 103, driving motor 128 switches to optically focused camera lens 110 and the actuator 112 that DVD uses to optically focused camera lens and actuator simultaneously.Microcomputer 147 makes motor 101 rotation, here, and the revolution of defined when the rotation number of motor is made as the information of playback inner periphery under the DVD situation.In addition, microcomputer 147 setting value in D/A transducer 141, and optically focused camera lens 110 temporarily away from after the indicator 100, shift near at leisure again.At this moment, switch 131,134 is in the state of disconnection, so can not be according to the focusing of FE signal and TE signal driving actuator 112 with coil and tracking coil.
Above explanation is identical with the situation among the embodiment 1.
The following describes the method for discrimination of the indicator in the present embodiment 2.
The highest frequency of the signal that is write down on the DVD is about 4MHz, and the linear velocity of DVD is about 3.3m/s.Under the situation of CD, linear velocity is about 1.3m/s, and at this moment the highest frequency of the signal of being reset is about 700KHz.Highest frequency when therefore, making the CD rotation with the linear velocity of DvD just is 700KHz * (3.27/1.3)=1.8MHz.So, during mobile optically focused camera lens,, in detection signal, there is the signal content of 4MHz if comparer 161 is output as high level, judge that the indicator that is loaded is DVD.Action after differentiating is the same with the above embodiments 1.
According to the above-mentioned example of present embodiment 2, use bandpass filter 160 by the signal content of 4MHz, its output uses comparer 161 to detect, and detects the signal content whether 4MHz is arranged, and differentiation is DVD or CD; But also can be output signal 2 values of this bandpass filter 160, its high level of instrumentation or low level extended period, thereby detect the signal content whether 4MHz is arranged, at this, DVD situation under, high level or low level extended period are about 125ns.
Represented block scheme on Fig. 5 as such configuration example, with the difference of the block scheme of Fig. 4 is to be the output of totalizer 148 Hi-pass filter 700 (call HPF700) of AS1 signal as input, the comparer 701 of the output of HPF700 as input, the output of comparer 701 as the cycle measuring circuit 702 of input and the output of cycle measuring circuit 702 as the microcomputer of importing 747, HPF700 is the wave filter that the radio-frequency component of input signal is passed through, and the cutoff frequency of HPF700 is set to the frequency that frequency content that the information that write down on the indicator 100 is kept is passed through.Therefore, the signal content of the information that is write down on the indicator 100 is input in the comparer 701, comparer 701 is to be that benchmark is transformed to high level or low level 2 value circuit to input signal with the zero level, like this, the signal that just become signal content 2 values of the information that is write down on the indicator 100 of the output of comparer 701.The high level of cycle measuring circuit 702 instrumentation input signals and low level time, and the instrumentation value delivered to microcomputer 747.In case send instrumentation value about 125ns here by above-mentioned cycle measuring circuit 702, microcomputer 747 just is judged to be DVD to the indicator of being packed into.125ns is corresponding to the signal content of 4MHz.And in microcomputer 747, the action that is taken into the instrumentation value and carries out action and microcomputer 147 outside the differentiation of indicator is identical.
As mentioned above, if optical disc apparatus according to present embodiment 2, owing to can detect corresponding to the signal that whether comprises the frequency content of regulation in the catoptrical AS1 signal from indicator with bandpass filter shown in Figure 4 160 and comparer 161, so, can high DVD and the low CD of line recording density of discriminant line recording density.
In addition, owing to can detect corresponding to the signal that whether comprises the frequency content of regulation in the catoptrical AS1 signal from indicator with Hi-pass filter shown in Figure 5 700, comparer 701 and cycle measuring circuit 702, so, can high DVD and the low CD of line recording density of discriminant line recording density.
Embodiment 3
Embodiments of the invention 3 below are described.
Fig. 6 is the block scheme of expression according to the formation of the optical disc apparatus of present embodiment 3.A part of together with symbolic representation identical in the foregoing description 1, difference according to the device of the optical disc apparatus of present embodiment 3 and the foregoing description 1 is an actuator 112,127 and optically focused camera lens 110,126 be replaced into actuator 172, optically focused camera lens 170 and holographic Figure 171.
Mode chart with Fig. 7 illustrates this optical system, and holographic Figure 171 only is formed near the optical axis center of light beam 150; Light beam 150 by optically focused camera lens 170 is pooled the focal point F DVD that focal point F CD that CD uses and DVD use, and the focal point F DVD that the focal point F CD that CD uses uses than DVD is on the farther position of optically focused camera lens 170.The distance of the focal point F DVD that focal point F CD that CD uses and DVD use is about 300 μ m, and the focus intensity of the focal point F DVD that DVD uses is about 2 times of focus intensity of the focal point F CD that uses of CD.
In Fig. 6, the same with the foregoing description 1, when being loaded into indicator 100 on the carriage 149, microcomputer 147 is installed to indicator 100 in the rotating shaft 102 of motor 101 with regard to driving motor 118.Next, make transfer bed 104 move to the inner periphery of indicator 100 through power amplification circuit 139 by transferring motor 103.Further, microcomputer 147 makes motor 101 rotations.The revolution of defined when the revolution of motor is made as the information of resetting its inner periphery in DVD; When motor 101 reaches the revolution that sets, this motor 101 is delivered to the terminal a of microcomputer 147 to the OK signal, when this OK signal is sent here, microcomputer 147 setting value in D/A transducer 141, and after optically focused camera lens 170 temporarily lowered, go up at leisure again.At this moment, switch 131,134 is in the state of disconnection.
Microcomputer 147 moves to after the upper limit position optically focused camera lens 170, carries out the differentiation of indicator.When discrimination result is that indicator is under the situation of CD-R, driving motor 118, movable support bracket 149 discharges indicator 100 from device.At indicator is under the situation of CD, after once more optically focused camera lens 170 being lowered, goes up at leisure again, surpasses the level of regulation and FE signal under the timing of initial zero crossing at the ENV signal, and Closing Switch 131 is carried out the focus control action.
At indicator is under the situation of DVD, and optically focused camera lens 170 is descended at leisure from indicator 100, and the while, under the timing of initial zero crossing, Closing Switch 131 was carried out the focus control action at the FE signal.
Below be described in detail in the reason that under CD and DVD situation, changes the moving direction of optically focused camera lens 170 when carrying out the focus control action.
Represented in Fig. 8 is FE signal and ENV signal under the situation that slowly rises again after optically focused camera lens 170 is temporarily lowered, the transverse axis express time.Under the situation of the optical system with two focuses, the focal point F DVD that focal point F CD that uses according to CD and DVD use changes FE signal and ENV signal.The situation of 2 laminars shown in the situation of 1 laminar DVD shown in Fig. 8 (a) and Fig. 8 (b) all is to make FE signal and ENV signal change (left side among the figure) at the focal point F CD that uses with CD at first, and after this focal point F DVD that uses with DVD again makes FE signal and ENV signal change (right side among the figure).To be CD focal point F CD be on the farther position of optically focused camera lens 170 than DVD focal point F DVD its reason.Therefore, under the situation of DVD, lower at leisure again after optically focused camera lens 170 is temporarily gone up, perhaps under the timing (time t12 or t13) that the FE signal zero intersects, make the focus control system acting the 2nd time (respectively at 1 laminar DVD, under the situation of 2 laminar DVD).Under the situation of CD, slowly lower again after optically focused camera lens 170 temporarily gone up, surpass under the level of regulation and the initial timing (time t1) that the FE signal zero intersects at the ENV signal simultaneously and make the focus control system acting.Be owing to there is the situation of the waveform of representing with dotted line in the FE signal under the CD situation that produces Fig. 8 (c) on the substrate surface (time t10) as the reason of condition the ENV signal.
The following describes the discriminant approach of the indicator that microcomputer 147 carries out.
Slowly between the rising stage, microcomputer 147 is taken into FE signal, AS1L signal, ENV signal, and measures its maximal value at optically focused camera lens 170.
Fig. 9 is represented is ENV signal, the AS1L signal of optically focused camera lens 170 when slowly rising, and the longitudinal axis is represented signal level, the transverse axis express time.
Fig. 9 (a), (b), (c) with situation, the situation of 2 laminar DVD, the situation of CD and the situation of CD-R of (d) representing 1 laminar DVD respectively.
In the waveform of Fig. 9 (a), Senv represents the maximal value of the ENV signal during the mobile optically focused camera lens 170; Equally, Sas represents the maximal value of AS1L signal; Fig. 9 (b), (c), the situation of waveform (d) also is the same.
CD with focal point F CD, DVD with focal point F DVD when consistent with separately information faces, the signal level of ENV signal and AS1L signal uprises.The peaked situation of ENV signal is 1 laminar DVD (Senv) maximum, and 2 laminar DVD and CD (Tenv, Uenv) equal substantially, CD-R (Venv) minimum.The peaked situation of AS1L signal be 1 laminar DVD (Sas) and CD (Uas) greatly and equal substantially, the maximal value (Tas) of the AS1L signal of 2 laminar DVD is littler than CD (Uas), (Vas) minimum of CD-R.
(Tenv, Tas) (Senv, Sas) low reason is that the reflectivity of the 1st layer luminance factor 1 laminar DVD of 2 laminar DVD is low than 1 laminar DVD for the ENV signal of 2 laminar DVD and the maximal value of AS1L signal.
In CD, be CD with the light quantity of focal point F CD with the level (Uenv) of the ENV signal of focal point F CD than the low reason of level (Senv) of the ENV signal of above-mentioned 1 laminar DVD approximately be DVD with 50% of focal point F DVD light quantity according to CD.In CD according to DVD with the level (Uenv) of the ENV signal of focal point F DVD than being because the DVD focal point F DVD that under the prerequisite of the substrate thickness of 0.6mm, designs with the low reason of level (Senv) of the ENV signal of focal point F DVD according to DVD among the 1 laminar DVD, its focus is smudgy.
The ENV signal of CD and CD-R, poor (Uenv and Venv's is poor, and Uas and Vas's is poor) in the AS1L signal are because the absorptivity of the 650nm of CD-R is bigger than the absorptivity of CD.
The peaked above-mentioned microcomputer 147 of having measured above-mentioned FE signal, AS1L signal, ENV signal stores the Was of the relation that satisfies Vas＜Was＜Uas, Vas＜Was＜Tas and Vas＜Was＜Sas in advance, and the maximal value of above-mentioned AS1L signal and this Was comparison, if this maximal value is lower than Was, just the indicator of being packed into is judged to be CD-R; The indicator of being packed into is being judged to be under the situation of CD-R, carriage 149 is being moved, indicator 100 is being discharged from device with regard to driving motor 118.
Then, microcomputer 147 computing Senv/Sas, Tenv/Tas, Uenv/Uas.Senv/Sas and Tenv/Tas are equal substantially.Uenv/Uas is littler than Senv/Sas and Tenv/Tas.
Microcomputer 147 stores the value Z that predesignates, and removes the resulting value of maximal value of ENV signal and above-mentioned value Z comparison with the maximal value of AS1L signal, and differentiating the indicator of being packed into is DVD or CD.
The value of explanation Z below.
In the indicator of standard, measure Senv/Sas, Tenv/Tas, Uenv/Uas in advance, and determine this value Z according to its result.DVD is being set in 2 times the device of CD with the intensity of focal point F CD with the intensity of focal point F DVD, and the value of this Z is approximately 6 in 1 laminar DVD and 2 laminar DVD; Under the situation of CD, be approximately 2.Therefore the Z value is between 2 to 6.Even in order also correctly to differentiate indicator under the discrete situation of the characteristic of indicator, setting value Z satisfies 6/Z=Z/2.This Z value is approximately 4.Represented among Figure 23 is the value Z in the present embodiment 3 and the relation of indicator classification.The resulting value of maximal value of removing the ENV signal with the maximal value of AS1L signal greater than 4 situation under, be judged to be DVD; If be judged to be CD less than 4.But, because the result of division arithmetic is different because of the difference of the magnification of ENV signal and AS1L signal, so under the situation that has changed magnification, correspondingly just necessary change value Z; In addition, having changed under DVD usefulness focal point F DVD and the situation of CD, also must recently change fiducial value corresponding to intensity with the ratio of the intensity of focal point F CD.
As mentioned above, if optical disc apparatus according to present embodiment 3, owing to measure the maximal value of AS1L signal and the maximal value of ENV signal earlier, remove the maximal value of ENV signal with the maximal value of AS1L signal, again the gained result is compared with predetermined reference value, so, even use the focus of indicator and the optical disc apparatus of the optical sensing head of 2 focuses of the focus of the indicator of the thin baseplate material of resetting, also can differentiate the DVD of thin baseplate material and the CD of thick substrate material with playback thick substrate material.
When the indicator of being packed into is judged to be the CD of thick substrate material, microcomputer 147 just is set in the value of regulation in the D/A transducer 141, and mobile optically focused camera lens 170 is near indicator 100, and, in a single day microcomputer 147 detects the timing of carrying out focus control, with regard to Closing Switch 131, carry out focus control.Therefore, even use the focus of indicator and the optical disc apparatus of the optical sensing head of 2 focuses of the focus of the indicator of the thin baseplate material of resetting, also can in the CD of thick substrate material, normally carry out focus control with playback thick substrate material.
In addition, when the indicator of being packed into being judged to be the DVD of thin baseplate material, microcomputer 147 just is set in the value of regulation in the D/A transducer 141, and mobile optically focused camera lens 170 leaves indicator 100.And, in case microcomputer 147 detects the timing of carrying out focus control,, carry out focus control with regard to Closing Switch 131.Therefore, even use the focus of indicator and the optical disc apparatus of the optical sensing head of 2 focuses of the focus of the indicator of the thin baseplate material of resetting, no matter how baseplate material thickness can both normally carry out focus control with playback thick substrate material.
Embodiment 4
Embodiments of the invention 4 below are described.
Figure 10 is the block scheme according to the optical disc apparatus of present embodiment 4.Because the mark with embodiment 3 in identical label, so omitted explanation.Difference from Example 3 is amplifier 453, totalizer 454,462 and the D/A transducer 455 of photodetector 411, microcomputer 447, I/V transducer 450, low-pass filter 451, A/D transducer 452,461, gain-variable.
Photodetector 411 is that sensitive surface is carried out 5 photodetectors of cutting apart, and its structure is additional again sensitive surface on the photodetector 111 in the foregoing description 3.Figure 11 has represented the formation of this photodetector 411.That is: for the photodetector 111 of the foregoing description 3 is made of four sensitive surfaces such as sensitive surface A, B, C, D, photodetector 411 among the embodiment 4 is made of five sensitive surfaces such as sensitive surface A, B, C, D, E, therefore, just become the formation of an additional sensitive surface E on above-mentioned photodetector 111.Above-mentioned sensitive surface A, B, C and D constitute the inside portion of photodetector 411, the about 200 μ m in one side of this inside portion.Sensitive surface E constitutes the outside portion of photodetector 411, the about 2mm in one side of this outside portion.
At this, the output of the totalizer 148 of the output signal additive value of expression sensitive surface A, B, C, D is called the AS1 signal.Therefore, with embodiment 1,2,3 is the same, and differential amplifier output 117 shown in Figure 10 has just become the FE signal that departs from of the information faces of the focal point of expression light beam 150 and indicator.And the focal point that has been output into expression light beam 150 of differential amplifier 125 and the TE signal that departs from of recording track.The output of the sensitive surface E that is added is sent to I/V transducer 450.The output of I/V transducer 450 is sent to adding circuit 462 and LPF460.The output signal of totalizer 462 is the output signal added signal whole sensitive surfaces of photodetector 411, below this signal is called the AS signal.Equally, the output signal of LPF451 is called the ASL signal, the output signal of I/V transducer 450 is called the AS2 signal, and the output signal of LPF460 is called the AS2L signal.Above-mentioned ASL signal is sent to A/D transducer 461.Microcomputer 447 is taken into the output signal of A/D transducer 461, and same, microcomputer 447 is taken into the AS2L signal through A/D transducer 452.The action of I/V transducer 450 is identical with the action of I/V transducer 120, and is same, LPF451 and 160, A/D transducer 461 and 452, does same action with LPF165, A/D transducer 142 respectively.Amplifier 453 is the amplifiers that change gain with the instruction of microcomputer 447.Totalizer 454, D/A transducer 455 are done the action same with totalizer 132, D/A transducer 41 respectively.
The action of device shown in Figure 10 is described with process flow diagram shown in Figure 12.
In Figure 10, the same with embodiment 3, when indicator being loaded on the carriage 149, microcomputer 447 is with regard to driving motor 118, indicator 100 is installed in the rotating shaft 102 of motor 101 (step S1).
Then, microcomputer 447 usefulness D/A transducers 145, power amplification circuit 139 drive and carry motor 103, and transfer bed 104 is moved (step S2) to the inner periphery direction of indicator 100; And microcomputer 447 makes motor 101 rotations.Revolution is made as the revolution (step S3) of defined under the situation of the information of playback inner periphery when DVD.
In this state, microcomputer 447 judges that indicator 100 is DVD, CD or CD-R (step S4), will be described with regard to the method for discrimination of this indicator below.
At this, the formation of above-mentioned discriminant approach is that indicator 100 is more approached in the position the when position of the optically focused camera lens 170 of juggling finish time is carried out than focus control is normal.
The following describes indicator 100 and be the action under the DVD situation.
Microcomputer 447 is set the magnification (step S5) of amplifier 453 according to the value AS1Lp that is measured in the juggling (p represents " peak value ").Then, D/A transducer 141 slowly lowers optically focused camera lens 170 through totalizer 132 and power amplification circuit 133, and amplifies the FE signal that at this moment detects with amplifier 453; Detect the timing (step S6) of the initial zero crossing of FE signal according to the output valve of carrying out the A/D conversion with A/D transducer 140.In case detect the timing of this zero crossing, just the output valve of D/A transducer 141 is made zero, Closing Switch 131 is carried out focus control action (step S6) simultaneously.Above-mentioned AS1Lp is described in the back.
Coming declare record dish 100 below is the action of the situation of CD.
Identical with the situation of DVD, microcomputer 447 is set the magnification (step S7) of amplifier 453 according to the value AS1Lp that is measured in the juggling.And the revolution of motor 101 is set at revolution under the situation of playback CD inner periphery.
Then, temporarily lowered (step S8) afterwards at optically focused camera lens 170, slowly go up again, and according to the output valve of A/D transducer 140 under the timing of the initial zero crossing of FE signal, the output that detects envelope detected circuit 143 is the initial timing (step S9) that the ENV signal surpasses specified level.In case detect this zero crossing regularly, just the output valve of D/A transducer 141 is made zero, simultaneously, Closing Switch 131 is carried out focus control action (step S9).
The reason that the moving direction of optically focused camera lens 170 changes because of CD and DVD as mentioned above.Therefore, when in device, packing DVD into,, compare the playback of commencing signal at short notice with the situation of the CD that packs into because need not carry out the action that condenser light descends for the time being.Therefore, compare with CD under the situation of packing into continually, on average, have in the strong point of replay signal at short notice at DVD.
At indicator is under the situation of CD-R, and driving motor 118 moves carriage 149, and indicator 100 is discharged (step S10).
Below, the indicator discriminant approach that carries out as the microcomputer of describing later 447 is described with above-mentioned content.
After Figure 13 represents optically focused camera lens 170 temporarily lowered, FE signal under the situation about slowly going up again, ENV signal, AS1L signal, ASL signal and the value of removing the resulting value ENV/ASL of ENV signal level with the ASL signal level, the longitudinal axis is represented signal level, and transverse axis is represented the time.
Figure 13 (a) (b), represents the situation of 1 laminar DVD on (c) respectively, the situation of 2 laminar DVD, the situation of CD.
ENV signal and AS1L signal come variable signal with focal point F CD and DVD with focal point F DVD by CD, in the FE signal, when above-mentioned focal point F CD and FDVD pass through information faces, can cause the variation of the level that is commonly referred to as the S curve.
If experiment, under the situation of DVD, the value of ENV/ASL is the DVD focal point F DVD state consistent with information faces for maximum state.Its reason is described below.Because the ASL signal has the low-frequency component of reflection light quantity, so ENV/ASL is recorded the ratio that the byte on the dish is modulated with regard to the light beam that expression is radiated on the indicator.Therefore because on the indicator that is loaded only focus to be in state on the information faces of indicator be the state of the information of playback of recorded dish effectively, so under the DVD state consistent with information faces with focal point F DVD, the ENV/ASL maximum.In 1 laminar DVD, in the time t31 of the waveform of Figure 13 (a), ENV/ASL maximum.In 2 laminar DVD, DVD is with the focal point F DVD time t32 of the waveform of Figure 13 (b) consistent with two information faces respectively, and under the t33, ENV/ASL is equal substantially, and all is maximal value.Under the situation of CD, under the time t30 of CD with the waveform of focal point F CD Figure 13 (c) consistent with information faces, the ENV/ASL maximum.
In present embodiment 4, with whole sensitive surface A of photodetector 411, B, C, D, the suffered light quantity ASL of E obtains the ENV signal, promptly uses sensitive surface A, B, and C, the suffered light quantity of D asks the ENV signal also can obtain same result.And, remove the value of ENV with the value of ASL and come computing, it is also passable to replace ASL with AS1L, also can obtain same result.
Under such situation, when ENV/ASL is maximum state, use the AS2L level of the waveform that from the ASL level, deducts the AS1L level to remove in the AS1L/AS2L value that the AS1L level calculates, the value of 1 laminar DVD is all bigger than the value of the value of 2 laminar DVD and CD.Promptly in 1 laminar DVD, the intensity of the light beam in the centre of photodetector 411 uprises.
Below with Figure 24 its reason is described.
What Figure 24 was represented is in present embodiment 4, indicator is respectively 1 laminar DVD, ENV/ASL's is maximum state under the situation of 2 laminar DVD and CD, with the position relation of focal point F CD with information faces, Figure 24 (b) represents the folded light beam from the information faces of indicator 100 to photodetector 411 to Figure 24 (a) expression DVD with focal point F DVD and CD.
The situation of 1 laminar DVD at first is described, under the situation of 1 laminar DVD, it is when information faces and DVD are consistent with focal point F DVD that ENV/ASL reaches maximum.Folded light beam from information faces is compiled with detector lens 113, and incides on the photodetector 411 through cylinder camera lens 116.Therefore, DCD just converges at focus the center of photodetector 411 with the folded light beam RBDVD of light beam; Because not on information faces, so CD incides on the overall optical detecting device 411 with the folded light beam RBCD of light beam, integral body is illuminated CD faintly with focal point F CD.
The following describes the situation of 2 laminars, under the situation of 2 laminar DVD, it is when the 1st information faces or the 2nd information faces and DVD are consistent with focal point F DVD that ENV/ASL reaches maximum.The 1st information faces and the DVD consistent situation of focal point F DVD have been represented among the figure.AS1L/AS2L when AS1L/AS2L when the 1st information faces uses focal point F DVD consistent with DVD and the 2nd information faces and DVD use focal point F DVD consistent is same value substantially.
Under the situation of this 2 laminar DVD, DVD comes together in focus at the center of photodetector 411 with light beam from the folded light beam RBDVD1 of the 1st information faces, the DVD that sees through the 1st information faces is reflected by the 2nd information faces with light beam with light beam and CD simultaneously, and become folded light beam RBDVD2 and folded light beam RBCD respectively, and be mapped to photodetector 411 on the whole.This is because CD FCD focus and inconsistent with the focal point F DVD and the information faces of light beam through the DVD of the 1st information faces.
Because the reflectivity height of the information faces of the luminance factor 2 laminar DVD of the information faces of 1 laminar DVD, so the reception light quantity of the inboard of the photodetector 411 under the situation of 1 laminar DVD (being produced by folded light beam RBDVD) is just than reception light quantity (by the folded light beam RBDVD1 generation) height of the inboard of the photodetector under the situation of 2 laminar DVD 411.Under the situation of the 2nd laminar DVD, incide the outside of photodetector 411 from the folded light beam RBDVD2 of the 2nd information faces of DVD light beam, folded light beam RBCD1 from the 1st and the 2nd information faces of CD light beam, 2 also are added to above this, so the reception light quantity in the outside of the photodetector 411 under the situation of the reception light amount ratio 1 laminar DVD in the outside of the photodetector 411 under the situation of 2 laminar DVD (being produced by folded light beam RBCD) is big.Therefore, as mentioned above, the value of AS1L/AS2L is except that the value of 1 laminar DVD, and is bigger than the value of 2 laminar DVD.
The situation of bright CD furthermore, under the situation of CD, the maximal value of ENV/ASL occurs in information faces and CD with focal point F CD consistent the time.Therefore, CD just converges at focus the center of photodetector 411 with the folded light beam RBCD of light beam; Because DVD uses focal point F DVD not on information faces, so DVD incides on the overall optical detecting device 411 with the folded light beam RBDVD of light beam.
Because DVD is with the strength ratio CD of the focal point F DVD intensity height with focal point F CD, so the reception light quantity of the inboard of the photodetector 411 under the situation of 1 laminar DVD (being produced by folded light beam RBDVD) just than the reception light quantity (being produced by folded light beam RBCD) of the inboard of the photodetector under the situation of CD 411 greatly.Under the situation of CD, because DVD incides the outside of photodetector 411 with the folded light beam RBDVD of light beam, so the reception light quantity in the outside of the photodetector 411 under the situation of the reception light amount ratio 1 laminar DVD in the outside of the photodetector 411 under the situation of CD (being produced by folded light beam RBCD) is big.
Therefore, as mentioned above, the value of the AS1L/AS2L of 1 laminar DVD is greater than the value of CD.
Experiment shows that the value of the AS1L/AS2L of 1 laminar DVD is approximately 2 laminar DVD, 1.5 times of the AS1L/AS2L under each situation of CD.As mentioned above, relevant ENV/ASL is the level ENVp of the ENV signal under the maximal value state, and this level value among the 1 laminar DVD is greater than this level value under 2 laminar DVD and each situation of CD.Under the situation of the indicator of standard, no matter the maximal value ASLmax of ASL is what dish, 1 laminar DVD, and 2DVD laminar and CD, its value is all equal substantially.
The mode of differentiating 1 laminar DVD below is described.
Optically focused camera lens 170 is moved along the direction perpendicular to the information faces of indicator, simultaneously, calculate ENV/ASL, and store AS1Lp, AS2Lp, ASLp and the ENVp of this value when reaching peaked timing.In addition, the maximal value ASLmax of the ASL in measuring during whole that optically focused camera lens 170 moves, come the value according to following formula calculating Y with above value:
Y＝(ENVp/ASLmax)×AS1Lp/AS2Lp
This Y value of 1 laminar DVD is more much bigger than the value of the value of 2 laminar DVD and CD.Experiment as can be known, the value of 1 laminar DVD is approximately 4 times of value of the value of 2 laminar DVD and CD.Therefore, in advance the intermediate value of the value of the value of the value of 1 laminar DVD, 2 laminar DVD and CD is calculated, this value and Y value are compared, this just can be judged to be 1 laminar DVD to indicator.At this moment, owing to use ASLmax, so even the reflectivity of indicator etc. are very discrete, the Y value can be not influenced yet.
In present embodiment 4, use above-mentioned Y value to differentiate, because above-mentioned reason also can use the value Y2 of following formula to differentiate.
Y2＝AS1Lp/AS2Lp
And, under the discrete little situation of the reflectivity of indicator, also can use the value Y3 of following formula to differentiate.
Y3＝ENVp×AS1Lp/AS2Lp
In the device of present embodiment 4, the 1 laminar DVD that can reset, 2 laminar DVD and CD, but under the situation of the device that two kinds of dishes with the DVD of 1 laminar and CD are object, can differentiate 1 laminar DVD and CD by the value of above-mentioned Y.That is: can differentiate the indicator of thin baseplate material and the indicator of thick sill.
Below the mode of the other 2 laminar DVD in area pellucida and CD.
Optically focused camera lens 170 is moved along the direction perpendicular to the information faces of indicator, calculate ENV/ASL simultaneously, the value ASLp of the ASL when measuring its value and reaching peaked timing; In addition, measure the maximal value ASLmax of the ASL during mobile optically focused camera lens 170 whole, come calculated value Z according to following formula by above value:
Z＝ASLp/ASLmax
This value Z of 2 laminar DVD is bigger than this value of CD.
This is because in 2 laminar DVD,, also is injected into basically on the photodetector 411 by the 2nd layer of beam reflected through the 1st layer with under focal point F DVD and the 1st layer of situation that information faces is consistent at DVD.This is because the interval between the 1st layer and the 2nd layer is short to the cause of about 40 μ m.DVD also is same with focal point F DVD with the 2nd layer of situation that information faces is consistent.
In CD, use under the focus situation consistent at DVD with information faces, DVD is reflected by information faces with the light beam of focal point F DVD, almost all is injected on the photodetector 411.In this state, ASL reaches maximal value.This is because CD is little with the luminous flux of focal point F DVD with the light flux ratio DVD of focal point F CD.In addition, in CD, under the focal point F CD of the CD situation consistent with information faces, DVD becomes fuzzy light with the light beam of focal point F DVD by the information faces reflection, and exceeds the scope of photodetector 411.This is because CD is approximately the cause of 300 μ m with the distance of focal point F DVD with focal point F CD and DVD.Therefore, and compare under the DVD focal point F DVD situation consistent with information faces, the level of ASL is just low.
Experiment shows that the Z value of 2 laminar DVD is approximately 1, and the value of CD is approximately 0.5.Therefore, precompute the intermediate value G of the value of the value of 2 laminar DVD and CD, it and Z value relatively, just can distinguish 2 laminar DVD and CD again.
Under the situation of 1 laminar DVD, because DVD is big with the luminous flux of the light flux ratio CD focal point F CD of focal point F DVD, so even CD exceeds photodetector 411 scopes with the reflected light of focal point F CD, the value of ASLp almost can be not influenced yet.Therefore, the Z value just is essentially 1.In the above-mentioned explanation of present embodiment 4, distinguish 2 laminar DVD and CD with the Z value, still, also can distinguish 1 laminar DVD and CD with it.That is: also can differentiate the indicator of thin baseplate material and the indicator of thick substrate material with the Z value.
The action of the microcomputer 447 in the above-mentioned differentiation is described with the process flow diagram of Figure 14 and Figure 15 below.
Microcomputer 447 is Lmax substitution FODA variable (step S11); And the value of FODA variable is set in the D/A transducer 141 (step S12), thus, camera lens 170 is moved up.Wherein, Lmax is the value of the top position of the CD information faces that is in indicator with focal point F CD and DVD with focal point F DVD.Then, be an action of a back, each variable of AS1Lp, AS2Lp, ASLp, ENVp, ASLmax and Qmax make zero (step S13); And, as the later action of a b, be from variable FODA, deducting among the resulting value substitution of the S variable FODA (step S14); The value of this variable FODA is set in the D/A transducer 141 (step S15).At this, S is more much smaller than Lmax, and be on the occasion of.Therefore, D/A transducer 141 output valve diminish, and through totalizer 132 and power amplifier 133 make optically focused camera lens 170 a little downward direction move.In this state, microcomputer 447 calculates ENV/ASL, and it is updated to (step S16) among the variable Q; Microcomputer 447 compares (step S17) to the value of variable Q and variable Qmax; Be updated to Qmax (step S18) in following value of variable Q of the little situation of variable Qmax; Microcomputer 447 is updated to variables A S2Lp to the value of AS2L, and is same, and the value of the value of ASS1L and ENV is updated to (step S19) in AS1Lp and the ENVp respectively; Then, microcomputer 447 is the value of ASL compare with the value of variables A SLmax (step S20); Under the little situation of the value of variables A SLmax, the value substitution variables A SLmax (step S21) of ASL.
(being NO in the judgement of step S22) turns back to the b point under the situation of value greater than Lmin of variable FODA; (being YES in the judgement of step S22) transfers to the later action of next c point under the situation of value less than Lmin of variable FODA.Lmin is that CD is in the locational value below the information faces of indicator with focal point F DVD with focal point F CD and DVD.
According to the action from an a to a c, CD uses focal point F DVD to pass through the information faces of an indicator with focal point F CD and DVD, and Figure 15 represents the later processing of c point.
Processing from a c to a d is the same substantially with above-mentioned processing from a b to a c, and its difference is that S is added to the resulting value substitution of variable FODA variable FODA (step S11a); Directly transfer to step S16 from step S12; And processing finishes when the value of the variable FODA moment bigger than Lmax (being YES among the step S22a).According to the action from a c to a d, CD passes through the information faces of an indicator with focal point F DVD with focal point F CD and DVD.Therefore, according to the action from an a to a d, CD passes through the information faces of twice indicator with focal point F DVD with focal point F CD and DVD.Like this, just can correctly detect ENV/ASL and reach maximum timing.During a b arrived some d, microcomputer 447 arrived totalizer 454 to sinewave output through D/A transducer 455, and through phase compensating circuit 135 and power amplification circuit 136 it was delivered to optically focused camera lens 170.Therefore, optically focused camera lens 170 just vibrates on the direction perpendicular to recording track.Often be between track and the track because can prevent focus, thus the information that is write down on the track of resetting easily, and can determine the correct level value of ENV signal.
In Figure 16, represented to be undertaken the variation of the position of the optically focused camera lens 170 during the differentiation of indicator by above-mentioned action.Among the figure, transverse axis express time, the longitudinal axis are represented the position of camera lens, and its positive dirction is represented the direction near indicator 100.Figure 14 and some a shown in Figure 15, c, d correspond respectively to the some a among Figure 16, c, d.At the time point of juggling end, above optically focused camera lens 170 is in.At indicator is under the situation of DVD, and optically focused camera lens 170 descends at leisure, detects the zero cross point of initial FE signal simultaneously, the line focusing of going forward side by side control action.Under the situation of CD, optically focused camera lens 170 descends earlier, rises at leisure again, detects the zero cross point of initial FE signal simultaneously, the line focusing of going forward side by side control action.
Therefore, compare with the situation of the CD that packs in situation about DVD being encased in the device, can be after the juggling of indicator, replay signal in the short time.
The situation that exposed installation is decided the magnification of amplifier 453 according to the value of AS1Lp below.The setting of this magnification is the timing of correctly carrying out the focus control action, at first with Figure 17 the timing of carrying out the focus control action is described.
Figure 17 represents the FE signal of 1 laminar DVD situation, transverse axis express time.Optically focused camera lens 170 is descended at leisure, make focal point F DVD that DVD uses near information faces.The FE signal is initially negative value, in the information faces moment vanishing consistent with focus, after this for just.The timing that focuses on action is the information faces time point f consistent with focus.There, detect the FE signal greater than comparative level Lc, and, detect hysteresis regularly in order to reduce, be necessary to make comparative level Lc to approach zero.But, owing to include noise etc. in the FE signal, so can not make it be entirely zero level.
Therefore, so-called comparative level Lc is not zero level Lz, and in Figure 17, the timing of time point f has just become to carry out the timing of focus control action., under the situation that the intensity of the reflectivity of the information faces of indicator and light beam 150 has reduced, the amplitude of FE signal also descends.Even comparative level is identical, if the amplitude of FE signal reduces, it is big that detected hysteresis also becomes.The worst situation is the situation that amplitude that the FE signal occurs does not reach comparative level.In the drawings, dotted line is represented the FE signal that amplitude lowers, and in this case, just can not detect the timing of carrying out the focus control action, therefore, just can not carry out the focus control action.
The variation of the intensity of the reflectivity of the information faces of indicator and light beam 150 becomes the variation of the level of the AS1Lp signal of focus when consistent with information faces, if that is: the reflectivity of the information faces of Jian Liing lowers, the level of AS1Lp signal just reduces pro rata with it, therefore, set the magnification of amplifier 453 if be DVD with the level of the AS1Lp under the focal point F CD situation consistent with focal point F DVD or CD with information faces according to the focus that is encased in the indicator correspondence in the device, even the reflectivity of the information faces of indicator etc. changes, also can obtain the FE signal of certain amplitude.Like this, just the decline of the amplitude of FE signal shown in Figure 17 can not take place, and can correctly and positively detect the timing that focuses on action.
At this, the amplitude of the FD signal under the standard state is made as H, the AS1Lp signal is made as J, and the amplitude under the situation that the FD signal has descended is made as H/2.At this moment, because AS1Lp is directly proportional with the amplitude of FE signal, so AS1Lp just becomes J/2.Because AS1Lp is J/2, be 50% of standard state, so microcomputer 447 is just brought up to 2 times to the magnification of amplifier 453.So, the amplitude that is input to the FE signal of A/D transducer 140 just becomes and is H, and is identical with the standard state value, so can detect the timing of carrying out the focus control action definitely.
In present embodiment 4, under the situation of DVD (1 laminar), it is the DVD focal point F DVD timing consistent with information faces that the value of ENV/ASL reaches maximum timing; Under the situation of 2 laminar DVD pVD with the consistent timing of any information faces in focal point F DVD and two information faces; Under the situation of CD, be the CD focal point F CD timing consistent with information faces.Experiment shows, because ENV/AS1L also shows the characteristic same with ENV/ASL, so, in the present invention, also can replace ENV/ASL with ENV/AS1L, and, in the present invention, be to detect the ENV signal, still from the AS signal, also can detect, can both obtain same characteristic from the AS1 signal.
In the above embodiments 4, a photodetector 411 that adopts five sensitive surfaces to constitute is illustrated, if change the structure of optical system, also can adopt two photodetectors to constitute.Figure 18 has represented to adopt the block diagram of two photodetectors, and the square frame mark identical label identical with Figure 10 omits its explanation.With the block scheme dissimilarity of Figure 10 be photodetector 111, half-reflecting mirror 601 and photodetector 602; These photodetectors 111, half-reflecting mirror 601 and photodetector 602 all are installed on the transfer bed 104.
Photodetector 111 is that the sensitive surface E of the photodetector 411 of Figure 10 is removed, only by sensitive surface A, and B, C, the photodetector that D constitutes.Photodetector 602 is the sensitive surface A photodetector 411, B, and C, D remove the photodetector that only is made of sensitive surface E.Figure 19 (a) (b) represents photodetector 111 respectively, the mode chart of photodetector 602; In the photodetector 602 of Figure 19 (b), oblique line partly is a sensitive surface, and these photodetectors 111,602 are mounted to such an extent that the center P point of its photodetector is consistent with incident light axis separately with the Q point.
Light beam by cylinder camera lens 116 was called two light beams in 601 minutes by half-reflecting mirror, and a light beam incides photodetector 111, and another light beam incides photodetector 602.Photodetector 602 is installed in from half-reflecting mirror 601 to photodetector 602 distance and from the equidistant position of half-reflecting mirror 601 to half detecting devices 111.Therefore, just the situation with shown in Figure 10 is identical with 450 input signal for I/V transducer 114,115,119,120, so the action of the device also formation with Figure 10 is identical.
As mentioned above, optical disc apparatus according to present embodiment 4, have in the optical disc apparatus of optical sensing head of two focuses of the focus that the focus that the indicator of playback thick substrate material uses and the indicator of resetting thin baseplate material use in use, come the reflected light at inspection center position and the catoptrical intensity separately at peripheral position with photodetector 411, just can differentiate the indicator of thick substrate material and the indicator of thin baseplate material according to the ratio of this intensity again.
In addition, the reception light quantity of the photodetector 411 when reaching maximum owing to employing ENV signal is so can correctly carry out the differentiation of indicator.
Because the reception light quantity of the photodetector 411 the when value that adopts the ENV signal to obtain divided by the level of ASL signal reaches maximum, so, also can correctly carry out the differentiation of indicator even the reflectivity of indicator 100 is discrete.
Because with (reception light quantity AS1Lp and the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information signal of the 1st photosensitive region of recently measuring photodetector 411 of AS1Lp * ENVp) and AS2Lp are so can improve the discrimination precision of indicator.
Because reception light quantity AS1Lp, the reception light quantity AS2Lp of the 2nd photosensitive region, the range value ENVp and the ASLmax of information signal with the 1st photosensitive region of recently measuring photodetector 411 of AS1Lp * ENVp and AS2Lp * ASLmax, even, also can correctly carry out the differentiation of indicator so the reflectivity of indicator is discrete.
Even under the situation of the photodetector 411 that constitutes Figure 10 by photodetector shown in Figure 180 111 and photodetector 602, also can access same effect.
According to present embodiment 4, have in the optical disc apparatus of optical sensing head of two focuses of the focus that the focus that the indicator of playback thick substrate material uses and the indicator of resetting thin baseplate material use in use, come the reflected light at inspection center position and the catoptrical intensity separately at peripheral position with photodetector 411, just can differentiate indicator that an information faces is arranged and the indicator that two information faces are arranged according to the ratio of this intensity again.
Because the reception light quantity of the photodetector 411 when adopting the ENV signal to reach maximum is so can correctly carry out the differentiation of indicator.
Because the reception light quantity of the photodetector 411 the when value that adopts the ENV signal to obtain divided by the level of ASL signal reaches maximum, so, also can correctly carry out the differentiation of indicator even the reflectivity of indicator 100 is discrete.
Because with (reception light quantity AS1Lp and the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information signal of AS1Lp * ENVp) and the 1st photosensitive region of recently measuring photodetector 411 of AS2Lp are so can improve the discrimination precision of indicator.
Because reception light quantity AS1Lp, the reception light quantity AS2Lp of the 2nd photosensitive region, the range value ENVp and the ASLmax of information signal with the 1st photosensitive region of recently measuring photodetector 411 of AS1Lp * ENVp and AS2Lp * ASLmax, even, also can correctly carry out the differentiation of indicator so the reflectivity of indicator is discrete.
Even under the situation of the photodetector 411 that constitutes Figure 10 by photodetector shown in Figure 180 111 and photodetector 602, also can access same effect.
According to present embodiment 4, have in the optical disc apparatus of optical sensing head of two focuses of the focus that the focus that the indicator of playback thick substrate material uses and the indicator of resetting thin baseplate material use in use, detect focus suitable on the indicator 100 that is loaded near information faces the time reception light quantity ASLp and focus is moved after the maximal value ASLmax of reception light quantity, obtain the ratio of ASLp and ASLmax, again according to this value than just differentiating the indicator of thick substrate material and the indicator of thin baseplate material.
Because the reception light quantity of the photodetector 411 the when value that adopts the ENV signal to obtain divided by the level of ASL signal reaches maximum, so, also can correctly detect suitable focus and be near the information faces even the reflectivity of indicator 100 is discrete.
According to present embodiment 4, have in the optical disc apparatus of optical sensing head of two focuses of the focus that the focus that the indicator of playback thick substrate material uses and the indicator of resetting thin baseplate material use in use, detect focus suitable on the indicator 100 that is loaded near information faces the time, change the magnification of amplifier 453 that amplification focus in the focus control device departs from the variable magnification of detection signal according to the value that receives light quantity AS1Lp, so even the reflectivity of indicator is discrete, the amplitude of FE signal also is certain, thus can make the timing of carrying out focus control action correct.
Because after changing the magnification of amplifier 453, the focus control action is carried out in the timing when reaching the level of regulation by the output signal of amplifier 453, so the timing of the mistake that can cause by noise etc. does not focus on action.
Because the reception light quantity of the photodetector 411 the when value that adopts the ENV signal to obtain divided by the level of ASL signal reaches maximum, so, also can detect suitable focus by correct timing and be near the information faces even the reflectivity of indicator 100 is discrete.
According to present embodiment 4 and since two focuses of the focus that the indicator of the focus that the indicator of playback thick substrate material is used and the thin baseplate material of resetting is used respectively twice by information faces, so can correctly detect reflection light quantity from indicator 100.
Embodiment 5
The following describes embodiments of the invention 5.
Figure 20 represents the block scheme of the optical disc apparatus of embodiments of the invention 5, and the square frame mark identical with embodiment 3 be with same label, its explanation of Therefore, omited, with the foregoing description 3 differences be signal processing circuit 500 and microcomputer 547.
The information that the output signal AS1 of signal processing circuit 500 usefulness totalizers 148 resets and write down on indicator 100, and be transformed into numerical data and deliver to microcomputer 547, and, the information that signal processing circuit 500 can be reset CD and DVD, the switching of action is undertaken by the instruction of microcomputer 547.
With Figure 21 (a), (b) waveform shown in illustrates the action of device shown in Figure 20.The waveform of Figure 21 (a) is represented the position of condenser head 170, the output signal that the waveform table differential of Figure 21 (b) is divided amplifier 117, i.e. FE signal.
In Figure 20, when being loaded into indicator 100 on the carriage 149, microcomputer 547 is installed to indicator 100 in the rotating shaft 102 of motor 101 with regard to driving motor 118.Next, transfer bed 104 is moved to the inner periphery of indicator 100, microcomputer 547 makes motor 101 rotations.The rotation number of motor 101 is set at the revolution of the inner periphery under the CD situation.Shown in the t210 of the waveform of Figure 21 (a), microcomputer 547 to D/A transducer 141, and temporarily lowers setting value to optically focused camera lens 170, after this goes up at leisure again.At this moment, switch 131,134 is in the state of disconnection.Here, the output signal of D/A transducer 141 is sent to actuator 172 through adding circuit 133 and power amplification circuit 139, so the output signal level of D/A transducer 141 is just corresponding to the position of optically focused camera lens 170.
Optically focused camera lens 170 rises at leisure, and the ENV signal surpasses the level of regulation and when the timing of the initial zero crossing of FE signal, switch 131 closures, carries out the focus control action simultaneously.At this moment be the timing of t211 of the waveform of Figure 21 (b).As the explanation of above-mentioned embodiment 3, be under the situation of CD at indicator 100, to be CD be in timing on the disc information face with focal point F CD in the timing of this focus control action.Therefore, the focus control action just makes CD be on the information faces of CD with focal point F CD.And microcomputer 547 Closing Switch 134 are carried out focus control.Microcomputer 547 switches to signal processing circuit 500 operating state of the information of playback CD.So the information of signal processing circuit 500, and it is delivered to microcomputer 547 with regard to being write down on the playback of recorded dish 100.At Figure 21 (a), (b) in, the represented waveform of dotted line is not carry out the focus control waveform in when action, that is: be waveform illustrated among the embodiment 3.
Below further specify above-mentioned signal processing circuit 500 with Figure 21 (c) and Figure 21 (d).
The block scheme of the above-mentioned signal processing circuit 500 of Figure 21 (c) expression, input end 601 is connected on the totalizer 148, is used for importing the AS1 signal; Output terminal 605 is connected on the microcomputer 547, and CD is to be used for resetting the circuit of information of CD with information playback circuit 602; DVD comes the circuit of playback of DVD information with information playback circuit 603.Switch 606 comes the signal of switch terminal a or end b according to the level of control end d, and is exported by end c, and input end 604 is connected on the control end d of switch 606.
The above-mentioned CD of Figure 21 (d) expression block scheme of information playback circuit 602, the AS1 signal is imported into input end 704, and output terminal 705 is connected on the switch 606, Hi-pass filter 700 filtering low frequency components.When the level of input signal is higher than zero level, comparer 701 output high level signals, and the level of input signal is when being lower than zero level, then output low level signal.Cycle sign indicating number shape testing circuit 706 detects the cycle sign indicating number shape of frame beginning place, and here, so-called frame is the interior frame of signal format of CD.Translation circuit 702 is transformed to the data and the output of 8 bytes to each of 17 byte datas of being exported; The benchmark that is used for the data of input signal are divided into 17 byte datas is regularly as the timing according to the output signal of cycle sign indicating number shape testing circuit 706.This conversion is to carry out according to the map table based on the modulator approach EFM (8-14 modulation) of CD mode, and in EFM, the data of 14 bytes in 17 bytes have information, and the obtained value of the data of this 14 byte is restricted to 256 kinds.Therefore, map table is 256 kinds of input data conversions 8 byte datas corresponding with it just.The output signal of translation circuit 702 is sent to error correction circuit 703, and error correction circuit 703 carries out the error correction of CD mode.
Because CD is on the information faces of CD with focal point F CD, just become a kind of data in the map table 256 kinds so be input to the data of translation circuit 702, therefore, the input data are by conversion correctly, thereby come the information that write down on the playback of recorded dish 100.
Coming declare record dish 100 below is action under the situation of DVD.No matter whether indicator is DVD, carry out focus control and regularly all be CD and be in timing on the information faces of indicator with focal point F CD, therefore, focus control makes CD be on the information faces of indicator with focal point F CD.And microcomputer 547 Closing Switch 134 are carried out focus control, and microcomputer 547 also switches to the playback operating state to signal processing circuit 500.
But, the modulator approach of CD mode is different with the modulation of DVD, therefore, the data that are input to the translation circuit 702 in the signal processing circuit 500 just are different from 256 kinds of data in the map table, like this, the not output data of translation circuit 702, therefore, because error correction circuit 703 is failure to actuate, use can not be delivered to information in the microcomputer 547.
Can not send information here from signal processing circuit 500 in case microcomputer 547 is known, just being judged as indicator 100 is DVD.And cut-off switch 131,134 is set to the state that focus control and tracking Control are failure to actuate.Later action Figure 22 (a), (b) waveform shown in illustrates, and the waveform of Figure 22 (a) is represented the position of condenser head 170, and it is the FE signal that the waveform table differential of Figure 22 (b) is divided the output signal of amplifier 117.
As mentioned above, microcomputer 547 is set at the rotation number of motor 101 revolution of the inner periphery under the DVD situation.Shown in the t310 of the waveform of Figure 22 (a), microcomputer 547 arrives D/A transducer 141 to setting value, and optically focused camera lens 170 temporarily shifted near indicator 100, after this at leisure optically focused camera lens 170 is fallen again, simultaneously when the timing of the initial zero crossing of FE signal, switch 131 closures, carry out the focus control action.At this moment be the timing of t311 of the waveform of Figure 22 (b).As the explanation of above-mentioned embodiment 3, be under the situation of DVD at indicator 100, to be DVD be in timing on the disc information face with focal point F DVD in the timing of this focus control action, and microcomputer 547 Closing Switch 134 are carried out focus control.Microcomputer 547 switches to signal processing circuit 500 operating state of the information of playback of DVD.So, the information of signal processing circuit 500 with regard to being write down on the playback of recorded dish 100, and it is delivered to microcomputer 547.In Figure 22, the represented waveform of dotted line is the waveform when not carrying out the focus control action, that is: be waveform illustrated among the embodiment 3.
In embodiment 5, microcomputer 547 be provided with CD for begin the action, but also can be set to DVD to indicator 100 at first and begin the action.At this moment, the revolution of motor 101 is set at the revolution of the inner periphery under the DVD situation, and the 170 temporary transient rises of optically focused camera lens are fallen at leisure more afterwards, under the timing of the initial zero crossing of FE signal, carries out the action of focus control action and tracking Control.Signal processing circuit 500 is set under the operating state of information of playback of DVD, when playback information not, be set at the state that focus control and tracking Control are failure to actuate, and, judge that indicator 100 is CD, the revolution of motor 101 is set at the revolution of the inner periphery under the CD situation.After microcomputer 547 temporarily lowers optically focused camera lens 170, rise at leisure again, when the ENV signal surpasses the level of regulation and the timing in the initial zero crossing of FE signal, carry out the focus control action, and follow the tracks of action simultaneously.Signal processing circuit 500 is set at the operating state of the information of playback CD.
As mentioned above, optical disc apparatus according to present embodiment 5, the optical sensing head of two focuses of focus that has the dish of the focus of dish of playback thick substrate material and thin baseplate material in use comes in the optical disc apparatus of playback information, even use inappropriate focus to focus on action owing under the situation that focuses on action with inappropriate focus, also detecting signal processing circuit, so can focus on action with suitable focus once more.
As mentioned above, according to the optical disc apparatus of the solution of the present invention 1, be provided with and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator, accept perpendicular to information faces from indicator catoptrical optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Driving above-mentioned mobile device makes above-mentioned focus pass through information faces, obtain the maximal value ASILmax of output valve of above-mentioned optical detection device and the maximal value ENVmax of information playback signal amplitude, differentiating the indicator of being packed into according to the ratio of this ENVmax and ASILmax with above-mentioned discriminating gear is the indicator of thick substrate material or the indicator of thin baseplate material, so this just can differentiate the DVD of thin baseplate material and the CD of thick substrate material.
According to the optical disc apparatus of the solution of the present invention 2, be provided with and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator, accept perpendicular to information faces from indicator catoptrical optical detection device, from above-mentioned optical detection device detect the frequency content of regulation signal supervisory instrument, to differentiate the indicator of being packed into be the discriminating gear of the low indicator of high indicator of line recording density or line recording density; The output signal of the above-mentioned signal supervisory instrument when making above-mentioned focus by information faces according to the above-mentioned mobile device of driving, differentiating the indicator of being packed into above-mentioned discriminating gear is high indicator of line recording density or the low indicator of line recording density, so this just can high indicator and the low indicator of line recording density of discriminant line recording density.
According to the optical disc apparatus of the solution of the present invention 3, the indicator that is provided with and makes the mobile device that moves along the direction perpendicular to information faces from the focus of the light beam of the information faces playback information of indicator, accepts self-recording catoptrical optical detection device, the high level of the output signal of 2 value devices of output signal 2 values of above-mentioned optical detection device, the above-mentioned 2 value devices of instrumentation or the cycle measuring device of low level time, differentiation are packed into is the discriminating gear of the low indicator of high indicator of line recording density or line recording density; The output signal of the above-mentioned cycle measuring device when making above-mentioned focus by information faces according to the above-mentioned mobile device of driving, differentiating the indicator of being packed into above-mentioned discriminating gear is high indicator of line recording density or the low indicator of line recording density, so this just can high indicator and the low indicator of line recording density of discriminant line recording density.
Optical disc apparatus according to the solution of the present invention 4, be provided with and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator, accept to differentiate under the situation of the catoptrical optical detection device from indicator, level that the above-mentioned optical detection device output valve when driving above-mentioned mobile device and making above-mentioned focus by information faces is lower than regulation for the discriminating gear of organic color material as the indicator of recording film perpendicular to information faces, so, can enough simple formations differentiate the CD-R indicator.
According to the optical disc apparatus of the solution of the present invention 5, be that the output signal that is provided with in the optical disc apparatus of the solution of the present invention 4 records according to above-mentioned optical detection device detects the focus offset signal pick-up unit that the focus of representing the beams focusing state on the information faces that shines departs from detection signal; Be lower than in the amplitude of above-mentioned focus offset signal detection signal under the situation of level of regulation, it is the indicator of organic color material as recording film that above-mentioned discriminating gear is differentiated the indicator of being packed into, so this just can differentiate the indicator of organic color material as recording film.
Optical disc apparatus according to the solution of the present invention 6, be in the optical disc apparatus of the solution of the present invention 4 records, intensity when above-mentioned discriminating gear makes the intensity of light beam be lower than playback information comes dish is differentiated, so, even the indicator of being packed into is CD-R, when differentiating indicator, also can not destroy the information of indicator.
According to the optical disc apparatus of the solution of the present invention 7, be provided with and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator, accept perpendicular to information faces from indicator catoptrical optical detection device, differentiate the discriminating gear that the indicator of being packed into has the indicator of an information faces or has the indicator of two information faces; Above-mentioned optical detection device output valve when driving above-mentioned mobile device and making above-mentioned focus by information faces is lower than under the situation of level of regulation, above-mentioned discriminating gear is differentiated for being to have two information faces indicators, so, can enough simple formations, be lower than specified level by the maximal value of above-mentioned ENV signal and differentiate 1 laminar DVD and 2 laminar DVD.
According to the optical disc apparatus of the solution of the present invention 8, be that the output signal that is provided with in the optical disc apparatus of the solution of the present invention 7 records according to above-mentioned optical detection device detects the focus offset signal pick-up unit that the focus of representing the beams focusing state on the information faces that shines departs from detection signal; Be lower than in the amplitude that above-mentioned focus departs from detection signal under the situation of level of regulation, above-mentioned discriminating gear is differentiated the indicator of being packed into for being the indicator with two information faces, so this just can differentiate 1 laminar DVD and 2 laminar DVD.
Optical disc apparatus according to the solution of the present invention 9, be provided with and make the mobile device that moves along direction from the focus of the light beam of the information faces playback information of indicator perpendicular to information faces, acceptance is from the catoptrical optical detection device of indicator, the maximal value of the information playback signal amplitude of the above-mentioned optical detection device when making above-mentioned focus by information faces according to the above-mentioned mobile device of driving is differentiated the indicator that the indicator of being packed into is the thick substrate material or is approached the discriminating gear of the indicator of baseplate material, so, can enough simple formations differentiate the DVD of thin baseplate material and the CD of thick substrate material.
Optical disc apparatus according to the solution of the present invention 10, it is the optical system of in the optical disc apparatus of the solution of the present invention 1 record, the optical system of the recorded information of playback of recorded dish being used as the indicator of thin baseplate material, so under the situation of the indicator of the thin baseplate material of packing into, can shorten the time before can the information of playback of recorded dish.
Optical disc apparatus according to the solution of the present invention 11, be in the solution of the present invention 1,2,3,4, output valve at above-mentioned optical detection device in the optical disc apparatus of 7 or 9 records is under the situation above setting, the control mobile device reduces the focus translational speed, so this level that just can slow down AS1L signal, ENV signal and FE signal changes, and obtain the correct maximal value of AS1L signal, ENV signal and FE signal amplitude, thereby can improve the reliability that indicator is differentiated.
Optical disc apparatus according to the solution of the present invention 12, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material to come the optical disc apparatus of playback information, be provided with and make the mobile device that focus moves along the direction perpendicular to information faces on above-mentioned two with playback thick substrate material, acceptance is from the catoptrical optical detection device of dish, detect the focus that focus that expression shines the beams focusing state on the information faces departs from detection signal according to the output signal of above-mentioned optical detection device and depart from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action; Drive above-mentioned mobile device and make focus away from indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, and above-mentioned focus control device is failure to actuate; Driving above-mentioned mobile device makes above-mentioned focus near indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, so, come in the optical disc apparatus of playback information at optical sensing head with above-mentioned two focuses, even the indicator discriminating gear is not set, also can on the indicator of the indicator of thick substrate material and thin baseplate material, carry out the focus control action with suitable focus, and under the situation of the indicator of the thick substrate material of having packed into, also has the effect of the leading time that can shorten device.
Optical disc apparatus according to the solution of the present invention 13, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material to come the optical disc apparatus of playback information, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, detect the focus that focus that expression shines the beams focusing state on the information faces departs from detection signal according to the output signal of above-mentioned optical detection device and depart from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action; Driving above-mentioned mobile device makes focus near indicator, signal according to above-mentioned timing signal generator makes above-mentioned focus control device action, when not reading information, driving above-mentioned mobile device makes above-mentioned focus away from indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, even the indicator discriminating gear is not set, also can on the indicator of the indicator of thick substrate material and thin baseplate material, carry out the focus control action with suitable focus, and under the situation of the indicator of the thick substrate material of having packed into, also has the effect of the leading time that can shorten device.
Optical disc apparatus according to the solution of the present invention 14, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of dish, detect the focus that focus that expression shines the beams focusing state on the information faces departs from detection signal according to the output signal of above-mentioned optical detection device and depart from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action, the indicator that differentiation is packed into is the dish of thick substrate material or the discriminating gear of the indicator of thin baseplate material; Under situation for the indicator of thick substrate material differentiated the indicator of being packed into by above-mentioned discriminating gear, driving above-mentioned mobile device makes above-mentioned focus near indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, so, this just can carry out the focus control action with suitable focus on the indicator of the indicator of thick substrate material and thin baseplate material, and under the situation of the indicator of the thick big sheet material material of having packed into, also has the effect of the leading time that can shorten device.
Optical disc apparatus according to the solution of the present invention 15, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, detect the focus that focus that expression shines the beams focusing state on the information faces departs from detection signal according to the output signal of above-mentioned detection device and depart from pick-up unit, the focus state that the output signal that departs from pick-up unit according to above-mentioned focus is controlled the above-mentioned light velocity reaches the focus control device of specified states, the output signal that departs from pick-up unit according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action, the indicator that differentiation is packed into is the indicator of thick substrate material or the difference device of the indicator of thin baseplate material; At above-mentioned difference device is the indicator differentiation of being packed into to approach under the situation of the indicator of baseplate material, driving above-mentioned mobile device makes above-mentioned focus away from indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, so, this just can carry out the focus control action with suitable focus on the indicator of the indicator of thick substrate material and thin baseplate material, and has the effect of the leading time that can shorten device.
Optical disc apparatus according to the solution of the present invention 16, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, detect the focus that focus that expression shines the beams focusing state on the information faces departs from detection signal according to the output signal of above-mentioned optical detection device and depart from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the output signal that departs from device according to above-mentioned focus produces the timing signal generator of the timing signal make above-mentioned focus control device action, the indicator that differentiation is packed into is the indicator of thick substrate material or the discriminating gear of the indicator of thin baseplate material; Under situation for the indicator of thick substrate material differentiated the indicator of packing into by above-mentioned discriminating gear, drive above-mentioned mobile device and make above-mentioned focus near the record indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action; At above-mentioned discriminating gear is the indicator differentiation of being packed into to approach under the situation of the indicator of baseplate material, driving above-mentioned mobile device makes above-mentioned focus away from indicator, the signal of replying above-mentioned timing signal generator makes above-mentioned focus control device action, so, this just can carry out the focus control action with suitable focus on the indicator of the indicator of thick substrate material and thin baseplate material, even under the situation of the indicator of the indicator of the thick substrate material of having packed into and the thin baseplate material of having packed into, also all have the effect of the leading time that can shorten device.
Optical disc apparatus according to the solution of the present invention 17, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information with playback thick substrate material, be provided with mobile device that above-mentioned two focuses are moved along the direction that overweights information faces, accept from indicator catoptrical have the 1st and the 2nd photosensitive region optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Above-mentioned the 1st photosensitive region of above-mentioned optical detection device is accepted the reflected light in centre, and above-mentioned the 2nd photosensitive region is accepted the reflected light at peripheral position; Drive above-mentioned mobile device, make above-mentioned two focuses pass through information faces, above-mentioned discriminating gear is differentiated the indicator that the indicator of being packed into is the thick substrate material according to the signal that detects on the above-mentioned the 1st and the 2nd photosensitive region or is approached the indicator of baseplate material, so, have the effect of the indicator of the indicator that can differentiate the thick substrate material and thin baseplate material.
Optical disc apparatus according to the solution of the present invention 18, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 17 is write down is used by the suitable beam focus of the level detection of the information playback signal of above-mentioned optical detection device and reached on the indicator near the information faces, and the still indicator of thin baseplate material of the indicator of the thick substrate material of differentiating according to the signal that detects on the 1st and the 2nd photosensitive region at this moment, so, have the effect that can correctly carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 19, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 18 is put down in writing is reaching on the indicator near the information faces according to the suitable beam focus that recently detects of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device, so, even the reflectivity of indicator etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
According to the optical disc apparatus of the solution of the present invention 20, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 17 is put down in writing comprises the measuring device of removing the range value ENVp of the reception light quantity AS2Lp of the division arithmetic device of the amplitude of information playback signal, the reception light quantity AS1Lp that measures the 1st photosensitive region when driving above-mentioned mobile device and making above-mentioned two focuses make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the 2nd photosensitive region and information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device; According to the value of AS2Lp with (value of AS1Lp * ENVp) recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material, so, have the effect that can improve record indicator discrimination precision.
According to the optical disc apparatus of the solution of the present invention 21, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 17 is put down in writing comprises from the output signal of the 1st photosensitive region with from the additive operation device of the output signal addition of the 2nd photosensitive region, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the measuring device of the reception light quantity AS2Lp of reception light quantity AS1Lp the 2nd photosensitive region of the 1st photosensitive region when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses by information faces and the operation values of above-mentioned division arithmetic device reach maximum and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) with (value of AS1Lp * ENVp) recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material, so, even the reflectivity of indicator etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 22, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information with playback thick substrate material, be provided with mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces, accept from indicator the catoptrical the 1st and the 2nd optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Above-mentioned the 2nd optical detection device is accepted than above-mentioned the 1st optical detection device reflected light of wide region more; The signal that above-mentioned discriminating gear makes above-mentioned two focuses be detected by the above-mentioned the 1st and the 2nd optical detection device by information faces according to the above-mentioned mobile device of driving is differentiated the indicator that the indicator of being packed into is the thick substrate material or is approached the indicator of baseplate material, so, have the effect that can differentiate thick substrate stores record dish and thin baseplate material indicator
Optical disc apparatus according to the solution of the present invention 23, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 22 is put down in writing uses the suitable beam focus of the level detection of the information playback signal that is detected by above-mentioned optical detection device reaching on the indicator near the information faces, and still be the indicator of thin baseplate material according to the indicator that the signal that at that time the 1st and the 2nd optical detection device detects is differentiated the thick substrate material, so, have the effect that can correctly carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 24, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 23 is put down in writing is reaching on the indicator near the information faces according to the suitable beam focus that recently detects of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device, so, even the reflectivity of indicator etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
According to the optical disc apparatus of the solution of the present invention 25, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 22 is put down in writing comprises the division arithmetic device of removing the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to the value of AS2Lp with (value of AS1Lp * ENVp) recently differentiate the indicator that the indicator of being packed into is the thick substrate material or the indicator of thin baseplate material, so, have the effect that can improve the indicator discrimination precision.
According to the optical disc apparatus of the solution of the present invention 26, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 22 is put down in writing comprises from the output signal of the 1st optical detection device with from the additive operation device of the output signal addition of the 2nd optical detection device, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned two focuses by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) with (value of AS1Lp * ENVp) recently to differentiate the indicator of being packed into be the indicator of thick substrate material, so, even the reflectivity of indicator etc. are discrete, also have the effect that can correctly carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 27, be reset indicator with an information faces and have the optical disc apparatus of any one indicator of the indicator of two information faces of the light beam of irradiation line focus, be provided with mobile device that the focus that makes light beam moves along the direction perpendicular to information faces, accept from indicator catoptrical have the 1st and the 2nd photosensitive region optical detection device, differentiate the discriminating gear that the indicator of being packed into has the indicator of an information faces or has the indicator of two information faces; Above-mentioned the 1st photosensitive region of above-mentioned optical detection device is accepted the reflected light in centre, and above-mentioned the 2nd photosensitive region is accepted the reflected light at peripheral position; Drive above-mentioned mobile device, make above-mentioned focus pass through information faces, above-mentioned discriminating gear is differentiated the indicator that indicator with an information faces still has two information faces according to the signal that detects on the above-mentioned the 1st and the 2nd photosensitive region, so, have and can differentiate indicator and have the effect of the indicator of two information faces with an information faces.
Optical disc apparatus according to the solution of the present invention 28, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 27 is put down in writing uses the level detection beam focus of the information playback signal that is detected by above-mentioned optical detection device to reach near the information faces, and differentiate the indicator that indicator with an information faces still has two information faces according to the signal that detects on the 1st and the 2nd photosensitive region at that time, so, have the effect that can correctly carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 29, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 28 is put down in writing has reached near the information faces according to the beam focus of detection recently of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device, so, even the reflectivity of indicator etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
According to the optical disc apparatus of the solution of the present invention 30, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 27 is put down in writing comprises the measuring device of removing the range value ENVp of the reception light quantity AS2Lp of the division arithmetic device of the amplitude of information playback signal, the reception light quantity AS1Lp that measures the 1st photosensitive region when driving above-mentioned mobile device and making above-mentioned focus make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the 2nd photosensitive region and information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device; According to the value of AS2Lp with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces, so, have and can improve indicator and differentiate smart effect of filling.
According to the optical disc apparatus of the solution of the present invention 31, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 27 is put down in writing comprises from the output signal of the 1st photosensitive region with from the additive operation device of the output signal addition of the 2nd photosensitive region, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the reception light quantity AS1Lp of the 1st photosensitive region when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned focus by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the reception light quantity AS2Lp of the 2nd photosensitive region and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) is with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces, so, even the reflectivity of indicator etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 32, be reset indicator with an information faces and have the optical disc apparatus of any one indicator of the indicator of two information faces of the light beam of irradiation line focus, be provided with mobile device that above-mentioned focus is moved along the direction perpendicular to information faces, accept from dish the catoptrical the 1st and the 2nd optical detection device, differentiate the discriminating gear that the dish of being packed into has the indicator of an information faces or has the indicator of two information faces; Above-mentioned the 2nd optical detection device is accepted than above-mentioned the 1st optical detection device reflected light of wide region more; Above-mentioned discriminating gear is differentiated the indicator that indicator with an information faces still has two information faces according to driving signal that above-mentioned mobile device makes above-mentioned two focuses be detected by the above-mentioned the 1st and the 2nd optical detection device by information faces, so, have and can differentiate indicator with an information faces and indicator with two information faces.
Optical disc apparatus according to the solution of the present invention 33, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 32 is put down in writing uses the level detection beam focus of the information playback signal that is detected by above-mentioned optical detection device to reach near the information faces, and differentiate according to the signal that at that time the 1st and the 2nd optical detection device detects that the indicator of being packed into has the indicator of an information faces or the indicator with two information faces, so, have the effect that can correctly carry out the differentiation of indicator.
According to the optical disc apparatus of the solution of the present invention 34, be that the above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 33 is put down in writing has reached near the information faces according to the focus that recently detects the light beam that is suitable for indicator of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device;
According to the optical disc apparatus of the solution of the present invention 35, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 32 is put down in writing comprises the measuring device of removing the range value ENVp of the output signal level AS2Lp of the division arithmetic device of the amplitude of information playback signal, the output signal level AS1Lp that measures the 1st optical detection device when driving above-mentioned mobile device and making above-mentioned focus make the operation values of above-mentioned division arithmetic device reach maximum by information faces, the 2nd optical detection device and information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device; According to the value of AS2Lp with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces, so, have the effect that can improve the indicator discrimination precision.
According to the optical disc apparatus of the solution of the present invention 36, be that above-mentioned discriminating gear in the optical disc apparatus that the solution of the present invention 32 is put down in writing comprises from the output signal of the 1st optical detection device with from the additive operation device of the output signal addition of the 2nd optical detection device, remove the division arithmetic device of the amplitude of information playback signal with the value of the low frequency signal level of the output signal of above-mentioned optical detection device, the output signal level AS1Lp of the 1st optical detection device when the maximal value ASLmax of the above-mentioned adder when the above-mentioned mobile device of mensuration driving makes above-mentioned focus by information faces and the operation values of above-mentioned division arithmetic device reach maximum, the measuring device of the output signal level AS2Lp of the 2nd optical detection device and the range value ENVp of information playback signal; According to (value of AS2Lp * ASLmax) is with (indicator of being packed into of recently differentiating of the value of AS1Lp * ENVp) has the indicator of an information faces or the indicator with two information faces, so, even the reflectivity of indicator etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 37, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with the thick sill of resetting, acceptance is from the catoptrical optical detection device of dish, the indicator that differentiation is packed into is the indicator of thick substrate material or the discriminating gear of the indicator of thin baseplate material, drive the information faces pick-up unit that focus that above-mentioned mobile device makes two above-mentioned focuses detect the light beam that is suitable for coiling by information faces by the output signal of above-mentioned optical detection device has reached information faces; The indicator that the differentiation recently of the maximal value ASLmax of the output signal of the above-mentioned optical detection device when the output signal level ASLp of the aforementioned lights pick-up unit when detecting information faces according to above-mentioned information faces pick-up unit makes two above-mentioned focuses by information faces with the above-mentioned mobile device of driving is packed into is the indicator of thick substrate material or the indicator of thin baseplate material, so this just can differentiate the indicator of thick substrate material and the indicator of thin baseplate material.
Optical disc apparatus according to the solution of the present invention 38, be that above-mentioned information faces pick-up unit in the optical disc apparatus that the solution of the present invention 37 is put down in writing has reached near the information faces according to the focus that recently detects the light beam that is suitable for indicator of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device, so, even the reflectivity of record etc. are discrete, also has the effect that correctly to carry out the differentiation of indicator.
Optical disc apparatus according to the solution of the present invention 39, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information from the indicator with playback thick substrate material, be provided with mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces, accept from dish catoptrical optical detection device, differentiate the indicator that the indicator of being packed into is the thick substrate material or the discriminating gear of the indicator of thin baseplate material; Driving above-mentioned mobile device makes two above-mentioned focuses pass through information faces, obtain the maximal value AS1Lmax of output valve of above-mentioned optical detection device and the maximal value ENVmax of information playback signal amplitude, the indicator of being packed into according to the differentiation recently of this ENVmax and AS1Lmax is the indicator of thick substrate material or the indicator of thin baseplate material, so this just can differentiate the indicator of thick substrate material and the indicator of thin baseplate material.
Optical disc apparatus according to the solution of the present invention 40, be to use the optical sensing head of two focuses of focus of the indicator of the focus of indicator and thin baseplate material thickness to come the optical disc apparatus of playback information, be provided with the mobile device that above-mentioned two focuses are moved along the direction perpendicular to information faces with playback thick substrate material, acceptance is from the catoptrical optical detection device of indicator, the focus that detects the beams focusing state on the information faces that shines according to the output signal of above-mentioned optical detection device departs from pick-up unit, depart from the output signal of pick-up unit according to above-mentioned focus and control the focus control device that above-mentioned beams focusing state reaches specified states, the focus that detects the light beam that is suitable for indicator according to the output signal of above-mentioned optical detection device has reached near the information faces pick-up unit the information faces; Above-mentioned focus control device comprises the adjustable multiplying arrangement of magnification that the above-mentioned focus of amplification departs from the output signal of pick-up unit; Driving above-mentioned mobile device makes two above-mentioned focuses pass through information faces, the output valve of the above-mentioned optical detection device during according to the information faces detection signal that produces above-mentioned information faces pick-up unit is set the magnification of above-mentioned multiplying arrangement, so, even the reflectivity of indicator etc. are discrete, also have the amplitude that can make the FE signal and reach the effect that necessarily and correctly reaches the timing of carrying out the focus control action.
Optical disc apparatus according to the solution of the present invention 41, be in the optical disc apparatus that the solution of the present invention 40 is put down in writing, set after the magnification of above-mentioned multiplying arrangement, the output signal that detects above-mentioned multiplying arrangement reaches the level of regulation, make above-mentioned focus control device action, so the focus control action is carried out in the timing of the mistake that do not use because noise etc. causes.
Optical disc apparatus according to the solution of the present invention 42, be that above-mentioned information faces pick-up unit in the optical disc apparatus that the solution of the present invention 40 is put down in writing reaches near the information faces according to the focus that recently detects the light beam that is suitable for indicator of the low frequency signal level of the output signal of the level of information playback signal and above-mentioned optical detection device, so, even the reflectivity of indicator etc. are discrete, also have can enough correct timings detect suitable focus be in information faces near.
Optical disc apparatus according to the solution of the present invention 43, in the solution of the present invention 17,22,27,32,37, or 39 in the optical disc apparatus of being put down in writing, control above-mentioned mobile device twice of each focus differentiated by the indicator to being packed into after the information faces, so, can correctly detect the effect that reflection light quantity improves the discrimination precision of indicator thereby have.
Optical disc apparatus according to the solution of the present invention 44, in the solution of the present invention 17,22,27,32,37, or in 39 optical disc apparatus of being put down in writing, control above-mentioned focus control device and make the even numbers focus by during the information faces, above-mentioned focus is vibrated on perpendicular to the direction of recording track a little, because can prevent that focus is in the centre position between track and the track, so, the effect of the discrimination precision that improves indicator just had.
Optical disc apparatus according to the solution of the present invention 45, in the solution of the present invention 17,22, in 27,32,37 or 39 optical disc apparatus of being put down in writing, output valve at above-mentioned optical detection device surpasses under the situation of the value that sets, control the translational speed that above-mentioned mobile device makes it to reduce above-mentioned focus, so, the effect of the discrimination precision that improves indicator had.

Claims (1)

1. optical disc apparatus is characterized in that comprising:
Wavelength is the light source about 650nm; With
Mobile device moves the focus of the light beam of described light emitted when being used for the information faces playback information from CD with vertical direction on information faces; With
The total reflection light amount detecting device has: detect from catoptrical a plurality of photodetectors of the CD reflection of being loaded; The current signal of described a plurality of photodetector outputs is converted to a plurality of current-to-voltage convertors of voltage signal; With the totalizer of the voltage signal addition of described a plurality of current-to-voltage convertors output, this total reflection light amount detecting device detects from the total reflection light quantity of the CD reflection of being loaded as the output signal of described totalizer; And
Discriminating gear, be used for output signal at the described total reflection light amount detecting device when driving described mobile device and make described focus when the value of regulation is following by information faces, be judged as is to be the CD of the high organic color material of absorptivity about 650nm as recording film with the wavelength
Differentiated for being with the high organic color material of the absorptivity of the wavelength about 650nm during by described discriminating gear when the described CD of being loaded as the CD of recording film, do not carry out based on described light source to the information record of the described CD of being loaded and/or reset.
CNB2006100050928A 1995-07-27 1996-07-26 Optical disk apparatus Expired - Fee Related CN100405479C (en)

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Application Number Priority Date Filing Date Title
JP19168195 1995-07-27
JP191681/1995 1995-07-27
JP060512/1996 1996-03-18

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CNB021204012A Division CN1244105C (en) 1995-07-27 1996-07-26 Optical disc device

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CN1808588A true CN1808588A (en) 2006-07-26
CN100405479C CN100405479C (en) 2008-07-23

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CNB2006100050928A Expired - Fee Related CN100405479C (en) 1995-07-27 1996-07-26 Optical disk apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63153456A (en) * 1986-12-18 1988-06-25 Yokogawa Electric Corp Optical disk testing system
JPS63109366U (en) * 1986-12-27 1988-07-14
JPH0581685A (en) * 1991-09-24 1993-04-02 Sony Corp Optical disk device
US5373499A (en) * 1993-07-22 1994-12-13 International Business Machines Corporation Multilayer optical disk and system having multiple optical paths include identical total disk substrate thickness

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