CN1311444C - Optical disk device - Google Patents
Optical disk device Download PDFInfo
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- CN1311444C CN1311444C CNB2004100488327A CN200410048832A CN1311444C CN 1311444 C CN1311444 C CN 1311444C CN B2004100488327 A CNB2004100488327 A CN B2004100488327A CN 200410048832 A CN200410048832 A CN 200410048832A CN 1311444 C CN1311444 C CN 1311444C
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Abstract
In order to reproduce signals from a double-layer optical disc having two signal recording surfaces, a focus jump that the focusing of an objective lens from the one signal recording surface to the other signal recording surface is quickly achieved, is necessary. When a focus error signal (FE) from a pickup (60, 70) reaches a predetermined threshold value (Vcomp), a deceleration signal for decelerating the objective lens (42) is supplied to an actuator (47). Preferably, a deceleration pulse voltage is lowered step by step. The deceleration pulse voltage is determined in accordance with the maximum value (DFEmax) of a differential focus error signal (DFE) generated by differentiating the focus error signal (FE). Preferably, the address seeking is done simultaneously with the focus jump. The focus jump is performed in accordance with the layer-to-layer distance which is measured beforehand. The focus jump is performed by using a lens (143) having a controllable focal distance. Preferably, whether the layer is the first layer or the second layer is judged based on the reflected luminous power. If the focus error signal (FE) from the other layer is not obtained even when a certain time passages after the focus jump is started, the objective lens (42) is moved in the reverse direction.
Description
The application be that March 26, application number in 1999 are 97198298.8 the applying date, invention and created name divides an application for the patented invention application of " optical disc apparatus ".
Technical field
The present invention relates to optical disc apparatus, in more detail, relate to the optical disc apparatus that the multiplayer optical disk with a plurality of signal recording layers is carried out information regeneration or record.
Background technology
The recording capacity of general CD (mini disk) that provides now or CD-ROM (mini disk ROM (read-only memory)) is the 640M byte, but follows densification recently, and the DVD (digital video disc) of the recording capacity with 4.7G byte is provided.The thickness of CD or CD-ROM is 1.2mm, and diameter is 12cm.The thickness of DVD is half of CD or CD-ROM, is 0.6mm, and diameter is identical with CD or CD-ROM, is 12cm.In addition, also having designed by making signal recording surface is the two-layer DVD-dual layer that makes recording capacity reach the 8.5G byte (for example, people's work " the one-sided mode double-layer CD that reads " such as the pretty method of your will, the domestic technique report, the 41st volume, the 6th phase, 10～16 pages, Dec nineteen ninety-five).
When making double-layer CD regeneration, can consider such two kinds of renovation process: the method that makes two signal recording surface regeneration from a side of dish with two recording layers (signal recording surface); And the method that makes a signal recording surface regeneration from the both sides of dish respectively., make the method for a signal recording surface regeneration respectively from both sides, owing under the situation that makes another signal recording surface regeneration behind the regeneration ending of a signal recording surface again, the back side of dish must be turned over, so pretty troublesome.In addition, in the regenerative process of carrying out a signal recording surface, can not carry out the regeneration of another signal recording surface at once.Therefore, make the method for two signal recording surface regeneration become main flow from a side.
Shown in Figure 59, the one-sided double-layer CD that reads mode has following two recording layers: with aluminium etc. is the reflection-type recording layer 1 with the reflectivity more than 70% of material; And be the semitransparent type recording layer 2 with the reflectivity about 30% of material with gold etc., between these two recording layers 1,2, clip thickness and be about ultraviolet hardening resin about 40 microns as middle layer 3.Here, on reflection-type recording layer 1 and semitransparent type recording layer 2, writing down the information shown in Figure 60 respectively.That is, specifically, data and ID are arranged, comprise among the ID: address (track number), floor information (level number) and magnetic track information (track format information, district's information, track wise, reflectivity) as information.
Like this because the recording layer type that is translucent is arranged in double-layer CD, thus by from a side illuminating laser beam, it is focused on each recording layer respectively, can the information of reading and recording on this recording layer by optic pick-up device.
In addition, in double-layer CD, in order in the regenerative process of a recording layer, directly laser beam to be focused on another recording layer, begin to carry out the regeneration of another recording layer, and object lens are moved along optical axis direction, carry out so-called focus and shift (for example, the spy opens flat 8-171731 communique).
, in existing focus branch mode, shift the back in order to seek destination address, have elongated problem of access time in focus.
In addition, the distance between two-layer in the double-layer CD is in fact domestic at the model of whole dish to be not to be homogeneous, has discrete along radial direction.Therefore, focus is transferred to which position in the double-layer CD, have the problem that is difficult to correctly shift.
In addition, it is that the mechanical means that the governor motion that utilizes focus servo control to use makes object lens move along optical axis direction carries out that present focus shifts, so need the long time for the focus that makes laser beam moves to another recording layer from a recording layer, in addition, also there is the problem that breaks down easily in conventional device.
In addition, if on the record surface of DVD pin hole is arranged, then the layer information of address will be indeterminate, the problem that existence can not identification layer.
In addition, having on the dish under the situation of wound or surface blur, can not be from reflecting surface detection of focus error signal, object lens can not slow down, and have the problem of collision panel surface.
Summary of the invention
The object of the present invention is to provide a kind of optical disc apparatus that can correctly carry out the focus transfer.
Another object of the present invention is to provide a kind of optical disc apparatus that can shorten the hunting time of destination address.
Another object of the present invention is to provide a kind of any position in multiplayer optical disk can both carry out the optical disc apparatus of focus transfer accurately.
Another object of the present invention is to provide a kind of and can promptly carry out the optical disc apparatus that focus shifts.
Even another object of the present invention is to provide a kind of scar that on signal recording surface, has, also can discern the optical disc apparatus of each layer.
Another object of the present invention is to provide a kind of optical disc apparatus of object lens collision optical disc surface can prevent that focus from shifting the time.
If according to the present invention, then make information be recorded in the optical disc apparatus that the CD on the multilayer signal record surface regenerates and have: by object lens with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; When information readout device has focused on light beam on one deck signal recording surface in the multilayer, for on the signal recording surface that light beam is focused on another layer and generate the signal for faster make object lens quicken usefulness and the accelerator of supply information readout device along the normal direction of signal recording surface; And when the focus error signal that obtains from information readout device reaches predetermined level, generate and make the reduce-speed sign of object lens deceleration usefulness and the reduction gear of supply information readout device.
Above-mentioned predetermined level is preferably between the zero level and peak level of focus error signal.The voltage of reduce-speed sign is predetermined like this, promptly begins to be scheduled to the time that focus error signal reaches till the predetermined level corresponding to generate signal for faster from accelerator.
Above-mentioned predetermined level is preferably between the zero level and peak level of focus error signal.The service time of reduce-speed sign is predetermined like this, promptly begins to be scheduled to the time that focus error signal reaches till the predetermined level corresponding to generate signal for faster from accelerator.
Above-mentioned reduction gear preferably reduces the voltage of reduce-speed sign by stages.
Above-mentioned optical disc apparatus preferably also has the derivator that focus error signal is carried out differential.Reduction gear changes the voltage of reduce-speed sign corresponding to by the maximal value of the focus error signal of differential.
Above-mentioned optical disc apparatus preferably also has: storage is corresponding to the memory storage of a plurality of voltages of being scheduled to by the maximal value reduce-speed sign of the focus error signal of differential; And response is read the readout device of the voltage of the correspondence a plurality of voltages by the maximal value of the focus error signal of differential from memory storage.Reduction gear changes over the voltage of being read by readout device with the voltage of reduce-speed sign.
If according to another aspect of the present invention, then make information be recorded in the optical disc apparatus that the CD on the multilayer signal record surface regenerates and have: by object lens with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; When information readout device has focused on light beam on one deck signal recording surface in the multilayer, for on the signal recording surface that light beam is focused on another layer and generate the signal for faster make object lens quicken usefulness and the accelerator of supply information readout device along the normal direction of signal recording surface; And after generating signal for faster and begin to have passed through official hour from accelerator, generate and make the reduce-speed sign of object lens deceleration usefulness and the reduction gear of supply information readout device.
If according to another aspect of the present invention, then make information be recorded in the optical disc apparatus that the CD on the multilayer signal record surface regenerates and have: with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; Make information readout device move the drive unit of usefulness along signal recording surface; When information readout device has focused on a certain signal recording surface in the multilayer, generate the accelerator that focuses on the signal for faster of using on the signal recording surface of another layer; Along with being supplied to, according to the present address of information readout device sense information and the information of layer, the calculation element of the amount of movement of computing information readout device as the address of target with as the information of the layer of target; And control device, it drives drive unit, so that make information readout device move the amount of movement that is calculated, makes accelerator generate signal for faster simultaneously, and the supply information readout device, so that focus on the signal recording surface of destination layer.
If according to another aspect of the present invention, then make information be recorded in the device that the CD on the multilayer regenerates and have: with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; The different a plurality of points of distance at the center of distance CD detect first at interval the interfloor distance pick-up unit of the layer of the CD that is mounted; Storage is by the memory storage at first interval of interfloor distance pick-up unit detection; And control device, when the regeneration of the ground floor of CD, carry out under the situation of regeneration of the second layer, this control device is according to being stored in first in the memory storage at interval, and second of the ground floor and the second layer at interval when calculating regeneration, and the control information readout device focuses on light beam on the second layer.
Above-mentioned control device preferably includes: generation moves information readout device so that change its signal for faster apart from usefulness to CD, and the accelerator of supply information readout device; And generate to prevent information readout device that light beam is focused on the reduce-speed sign of the variable size of using on the second layer and the reduction gear of supply information readout device.
Above-mentioned control device preferably includes: generates and information readout device to be moved so that change its signal for faster apart from the variable size of usefulness to CD, and the accelerator of supply information readout device; And the reduce-speed sign of generate preventing information readout device that light beam is focused on to use on the second layer, and the reduction gear of supply information readout device.
Above-mentioned control device preferably includes: generates and information readout device to be moved so that change its signal for faster apart from the variable size of usefulness to CD, and the accelerator of supply information readout device; And the reduce-speed sign of the variable size of generate preventing information readout device that light beam is focused on to use on the second layer, and the reduction gear of supply information readout device.
Above-mentioned interfloor distance pick-up unit preferably can obtain to have the device of the focus error signal of two different peak values of polarity, control device generates and information readout device is moved so that change its signal for faster apart from usefulness to CD, and supply information readout device, the reduce-speed sign of generate preventing information readout device that light beam is focused on simultaneously to use on the second layer, and the supply information readout device, any time between two peak values can both switch to reduce-speed sign with the signal for faster of supply information readout device.
Above-mentioned interfloor distance pick-up unit preferably can obtain to have the focus error signal of two different peak values of polarity.Above-mentioned control device generates and information readout device is moved so that change its signal for faster apart from usefulness to CD, and in the middle of two peak values constantly before the supply information readout device, the reduce-speed sign of generate preventing information readout device that light beam is focused on simultaneously to use on the second layer, and the centre constantly after the supply information readout device.
If according to another aspect of the present invention, then make information be recorded in the device that the CD on the multilayer regenerates and have: with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; Generation moves information readout device so that change its signal for faster apart from usefulness to CD, and the accelerator of supply information readout device; And generate to prevent information readout device to make light beam focus on the reduce-speed sign of the variable size of using on the desirable layer and the reduction gear of supply information readout device.
If according to another aspect of the present invention, the optical disc apparatus that information is regenerated from the multiplayer optical disk with a plurality of recording layers has: laser instrument; Comprise and to be directed to the optical system of the lens of using on the multiplayer optical disk from the laser beam of laser instrument; And corresponding to the recording layer that should regenerate in a plurality of recording layers, the change device of the focal length of change lens.
Said lens is the parallel light tube lens preferably.
Above-mentioned parallel light tube lens preferably include: first lens; Second lens that is oppositely arranged with first lens; And be sandwiched in transparent component between first and second lens.Above-mentioned change device changes the refractive index of transparent component corresponding to the recording layer that should regenerate in a plurality of recording layers.
Above-mentioned transparent component preferably includes: first transparency electrode; Second transparency electrode that is oppositely arranged with first transparency electrode; And be sandwiched in liquid crystal between first and second transparency electrode.Above-mentioned change device comprises the recording layer that should regenerate corresponding in a plurality of recording layers, and the voltage of regulation is added in liquid crystal display drive circuit between first and second transparency electrode.
Above-mentioned optical disc apparatus preferably also has: the measurement mechanism of the distance between each recording layer of a plurality of position measurements in multiplayer optical disk; Store the memory storage of the distance of measuring by measurement mechanism with its position; And, determine definite device of afore mentioned rules voltage according to distance of storing in the memory storage and position.
If according to another aspect of the present invention, the optical disc apparatus that then makes information be recorded in the optical disc reproducing on the signal recording surface of the different ground floor of reflectivity and the second layer at least respectively has: light beam irradiates is detected its reflected light on CD, the information readout device that reads a certain signal in signal, focus error signal and the tracking error signal of output information; Store the memory storage that reads the level of a certain signal output signal, focus error signal and the tracking error signal from the information of the ground floor of information readout device output and the second layer in advance; And when the identification of ground floor and the second layer at need, the ground floor stored in a certain signal and the memory storage signal, focus error signal and the tracking error signal from reading of the information of information readout device output and the level of the second layer are compared, discern the recognition device of the ground floor or the second layer.
If according to another aspect of the present invention, then make information be recorded in the optical disc apparatus that the CD on the signal recording surface of multilayer regenerates and have: with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; When information readout device focuses on a certain layer signal record surface in the multilayer, generate and make it focus on the signal for faster of using on another layer signal record surface, and the accelerator of supply information readout device; And in the stipulated time of will speed up signal supply information readout device from accelerator after, counting, fail when information readout device obtains the reflected light of regulation, generate the reduce-speed sign of preventing information readout device to use, and the reduction gear of supply information readout device.
If according to another aspect of the present invention, then make information be recorded in the optical disc apparatus that the CD on the signal recording surface of multilayer regenerates and have: with light beam irradiates on CD, by detecting the information readout device of its reflected light sense information; When information readout device focuses on a certain layer signal record surface in the multilayer, generate and make it focus on the signal for faster of using on another layer signal record surface, and the accelerator of supply information readout device; And will speed up signal supply information readout device from accelerator after, fail to generate the reduce-speed sign of preventing information readout device to use when information readout device obtains the reflected light of specified level, and the reduction gear of supply information readout device.
Above-mentioned accelerator generates signal for faster after being preferably in and having prevented information readout device by reduction gear once more, and the supply information readout device.
Above-mentioned information readout device is preferably exported the signal that S shape control signal focuses on as expression, when reduction gear does not obtain S shape control signal in official hour, generates reduce-speed sign.
The afore mentioned rules time utilizes signal for faster to focus on the several times of needed time on another layer signal record surface when preferably being selected as on certain one deck in focusing on multilayer.
The reflected light of the level of a second aspect of the present invention regulation preferably is selected as from number/one's of the reflected light level of information readout device acquisition level.
Description of drawings
The oscillogram of the focus error signal that obtains under Fig. 1 situation that to be the focus that makes object lens move along two signal recording surfaces.
Fig. 2 is the sectional view of the structure of expression DVD-dual layer.
Fig. 3 is the sectional view of the structure of expression CD.
Fig. 4 is the structural drawing of optical pickup unit that can carry out the exchange regeneration of the different CD of substrate thickness.
Fig. 5 is the skeleton view of the structure of expression optical pickup unit shown in Figure 4.
Fig. 6 is the planimetric map that expression polarized light shown in Figure 5 is selected the polarization characteristic of element.
Fig. 7 is the block diagram of all structures of the expression optical disc apparatus that comprises Fig. 4 and optical pickup unit shown in Figure 5.
Fig. 8 is the block diagram of structure of the optical disc apparatus of expression example 1 of the present invention.
Fig. 9 is the decomposition diagram of the structure of expression governor motion shown in Figure 7.
Figure 10 is the circuit diagram of expression focus carry circuit shown in Figure 7.
Figure 11 is the process flow diagram of one of program stored example among the expression ROM shown in Figure 8.
The oscillogram of focus error signal, acceleration pulse and deceleration pulse when Figure 12 A～12C is DSP shown in Figure 8 according to works shown in Figure 11.
Figure 13 is another routine process flow diagram of program stored among the expression ROM shown in Figure 8.
The oscillogram of focus error signal, acceleration pulse and deceleration pulse when Figure 14 A～14C is DSP shown in Figure 8 according to works shown in Figure 13.
Figure 15 is another routine process flow diagram of program stored among the expression ROM shown in Figure 8.
The oscillogram of focus error signal, acceleration pulse and deceleration pulse when Figure 16 A～16C is DSP shown in Figure 8 according to works shown in Figure 15.
Figure 17 is another routine process flow diagram of program stored among the expression ROM shown in Figure 8.
The oscillogram of the speed of focus error signal, acceleration pulse, deceleration pulse and object lens when Figure 18 A～18D is expression DSP shown in Figure 8 according to works shown in Figure 17.
Figure 19 is another routine process flow diagram of program stored among the expression ROM shown in Figure 8.
The oscillogram of focus error signal, differential focus error signal and acceleration pulse when Figure 20 A～20C is DSP shown in Figure 8 according to works shown in Figure 19.
Figure 21 is one of the look-up table of the relation between the maximal value of the voltage of the deceleration pulse that applies the second time shown in an expression Figure 19 and Figure 20 A～20C and differential focus error signal illustration.
Figure 22 is the block diagram of structure of the optical disc apparatus of expression example 2 of the present invention.
Figure 23 is the process flow diagram of the work usefulness of explanation optical disc apparatus shown in Figure 22.
Figure 24 is the key diagram that the focus in the explanation optical disc apparatus shown in Figure 22 shifts and the job search of destination address is used.
Figure 25 A and Figure 25 B are the focus error signal in the expression work shown in Figure 24 and the sequential chart of screw drive signal.
Figure 26 is the sectional view that the actual single face of making of expression reads the structure of dual layer discs.
Figure 27 is the block diagram of structure of the optical disc apparatus of expression example 3 of the present invention.
Figure 28 is the key diagram that the surveying work of the interfloor distance that carries out of explanation optical disc apparatus shown in Figure 9 is used.
Figure 29 A is the oscillogram that is illustrated in the expression focus error signal that obtains when the Zhou Jinhang focus is retrieved in the dish, Figure 29 B is the oscillogram that is illustrated in the expression focus error signal that obtains when the Zhou Jinhang focus is retrieved in the dish, and Figure 29 C is the oscillogram that is illustrated in the expression focus error signal that obtains when the dish periphery is carried out the focus retrieval.
Figure 30 A is the process flow diagram of testing of distance between the bilayer of expression CD.
Figure 30 B is the process flow diagram of first example of expression focus transfer work.
Figure 31 A～31C be explanation in work shown in Figure 30 in dual layer discs the focus in week shift the sequential chart of usefulness.
Figure 32 A～32C is usefulness is shifted in explanation in the focus of dual layer discs periphery in a work shown in Figure 30 sequential chart.
Figure 33 is the process flow diagram of second example of expression focus transfer work.
Figure 34 A～34C be explanation in work shown in Figure 33 in dual layer discs the focus in week shift the sequential chart of usefulness.
Figure 35 A～35C is usefulness is shifted in explanation in the focus of dual layer discs periphery in a work shown in Figure 33 sequential chart.
Figure 36 is the block diagram of all structures of the optical disc apparatus of expression example 4 of the present invention.
Figure 37 is the block diagram of the structure of expression optic pick-up device shown in Figure 36.
Figure 38 is the side view of the structure of expression many focuses parallel light tube lens shown in Figure 37.
Figure 39 is the refractive index of expression TN type liquid crystal shown in Figure 38 and the curve map that applies the relation of voltage.
Figure 40 is the curve map after the major part of curve shown in Figure 39 is amplified in expression.
Figure 41 is the curve map of the relation of the refractive index of the distance from the substrate surface of multiplayer optical disk to focus and TN type liquid crystal shown in Figure 38 in the expression optic pick-up device shown in Figure 37.
Figure 42 is the planimetric map of the structure of expression photodetector shown in Figure 37.
Figure 43 is the process flow diagram of the surveying work of the interfloor distance stored among the expression ROM shown in Figure 36.
Figure 44 is the process flow diagram of the definite work that applies voltage of storing among the expression ROM shown in Figure 36.
Figure 45 is the key diagram of the surveying work of expression interfloor distance shown in Figure 9.
Figure 46 A is the oscillogram that is illustrated in the expression focus error signal that obtains when the Zhou Jinhang focus is retrieved in the dish, Figure 46 B is the oscillogram that is illustrated in the expression focus error signal that obtains when the Zhou Jinhang focus is retrieved in the dish, and Figure 46 C is the oscillogram that is illustrated in the expression focus error signal that obtains when the dish periphery is carried out the focus retrieval.
Figure 47 be represent voltage not to be added in shown in Figure 38 how burnt, the key diagram of the light path of the laser beam in the time of on the transparency electrode in the some parallel light tube lens.
Figure 48 is the key diagram of the light path of the laser beam of expression when being added in voltage on the transparency electrode in many focuses parallel light tube lens shown in Figure 38.
Figure 49 is the block diagram of all structures of the optical disc apparatus of expression example 5 of the present invention.
Figure 50 is the planimetric map of the structure of the expression photodetector that generates tracking error signal.
Figure 51 is the process flow diagram that the initialization of explanation optical disc apparatus shown in Figure 49 is used.
Figure 52 is the process flow diagram of using with the tracking error signal identification layer.
Figure 53 is the process flow diagram of using with the regenerated signal identification layer.
Figure 54 is the block diagram of structure of the optical disc apparatus of expression example 6 of the present invention.
Figure 55 is the process flow diagram of the work usefulness of the optical disc apparatus shown in explanation Figure 54.
Figure 56 A～56C is the key diagram of the work usefulness of the optical disc apparatus shown in explanation Figure 54.
Figure 57 is the block diagram of structure of the optical disc apparatus of expression example 7 of the present invention.
Figure 58 is the process flow diagram of the work usefulness of the optical disc apparatus shown in explanation Figure 57.
Figure 59 is the sectional view that the expression single face reads the simple structure of dual layer discs.
Figure 60 is the key diagram that the single face shown in expression Figure 59 reads the information of double-deck disc recording.
Embodiment
Below, the example that present invention will be described in detail with reference to the accompanying.In addition, identical or suitable part is marked with identical symbol among the figure, does not repeat its explanation.
[example 1]
For information being regenerated from two signal recording surfaces, need be in the regenerative process of a signal recording surface or after the regeneration focus of the object lens in the optical pickup unit be altered on another signal recording surface by a illuminating laser beam from CD.In existing method, under situation about focus being altered to from a signal recording surface on another signal recording surface,, object lens are slowed down if begin to observe focus error signal from this another signal recording surface., as shown in Figure 1, during the transfer of transferring to another signal recording surface from a signal recording surface in the Ttran, focus error signal FE with respect to the big situation of the difference of peak value under, comprise about 10% noise.Therefore, whether the detected signal that is difficult to judge rightly is the focus error signal FE from the signal recording surface that should regenerate, shifts so can not carry out correct focus.
Therefore, the purpose of example 1 of the present invention is to provide a kind of like this optical disc apparatus, promptly can make the different CD of substrate thickness exchange the optical pickup unit of regeneration main using, make information from having double-layer CD when regeneration of two signal recording surfaces, the focal position of laser beam can be switched to optical disc apparatus on another signal recording surface exactly from a signal recording surface.
With reference to Fig. 2, there are two signal recording surfaces 5,9 position of DVD-dual layer 1 is 0.6 at the distance substrate surface (permissible error is ± 0.05) mm.Should, DVD-dual layer 1 is to utilize the substrate 2 and 10 of thick 0.6 (permissible error is ± 0.05) mm that ultraviolet hardening resin 6 will be made of polycarbonate etc. to paste to form.The hole 3 that signal recording surface 5 is formed by the inboard at substrate 2 and be covered with hole 3 metallic reflective coatings that form 4 and constitute.The hole 7 that signal recording surface 9 is formed by the inboard at substrate 10 and be covered with hole 7 metallic reflective coatings that form 8 and constitute.Because the thickness of ultraviolet hardening resin is 40～70 microns, signal recording surface 5 has only 40～70 microns distance to signal recording surface 9.
In addition, with reference to Fig. 3, there is a signal recording surface 24 position of CD20 is 1.2 at the distance substrate surface (permissible error is ± 0.1) mm.The hole 22 that signal recording surface 24 is formed by a side of the substrate 21 that constitutes at transparent polycarbonate etc. and be covered with hole 22 metallic reflective coatings that form 23 and constitute.On signal recording surface 24, form diaphragm 25.
The ratings and the regeneration condition of CD and DVD-dual layer have been shown in the following table 1.
Table 1
| Kind | CD | Two-layer equation DVD | |
| Ratings | Reading face side group thickness of slab | 1.2mm (1.1～1.3mm) | 0.6mm (0.55～0.65mm) |
| Shortest pit length | 0.90μm (0.80～1.0μm) | 0.40μm (0.3～0.5μm) | |
| Track pitch | 1.6μm (1.5～1.7μm) | 0.74μm (0.73～0.75μm) | |
| Reflectivity | More than 70% | 20～40％ | |
| Regeneration condition | Spot diameter | 1.5μm (1.4～1.6μm) | 0.9μm (0.85～0.95μm) |
| Numerical aperture | 0.35 (0.30～0.40) | 0.60 (0.55～0.65) | |
| Wavelength | 635nm (620～650nm) | ||
The substrate thickness of reading face one side of CD is 1.2, and (allowed band: 1.1～1.3) mm, shortest pit length are 0.9 (allowed band: 0.8～1.0) μ m, track pitch are that 1.6 (allowed band: 1.5～1.7) μ m, reflectivity are more than 70%.On the other hand, the substrate thickness of reading face one side of DVD-dual layer is 0.6 (allowed band: 0.55～0.65) mm, shortest pit length is 0.40, and (allowed band: 0.30～0.50) μ m, track pitch is that 0.74 (allowed band: 0.73～0.75) μ m, reflectivity are more than 20～40%.
In addition, in regeneration condition, the wavelength of laser beam is 635 (allowed bands: 620～650) nm, the spot diameter of the laser beam of CD is 1.5 (allowed bands: 1.4～1.6) μ m, the effective numerical aperture of object lens is 0.35 (allowed band: 0.30～0.40), the spot diameter of the laser beam of DVD-dual layer is that 0.9 (allowed band: 0.85～0.95) μ m, the effective numerical aperture of object lens is 0.60 (allowed band: 0.55～0.65).
Fig. 4 and Fig. 5 represent the structure of optical pickup unit of the interchangeable regeneration of CD and DVD-dual layer.With reference to Fig. 4 and Fig. 5, optical pickup unit 60 has: the polarized light that wavelength takes place be the semiconductor laser 31 of the laser beam of 635nm, the plane of polarization rotating element 32 that makes the plane of polarization rotation of laser beam, diffraction grating 35, half-reflecting mirror 36, parallel light tube lens 37, selectively laser beam is seen through is selected element 38, object lens 42 and photodetector 43.Laser beam from semiconductor laser 31 is passed through plane of polarization rotating element 32 and diffraction grating 35, arrive half-reflecting mirror 36, half of light beam is reflected on half-reflecting mirror 36, by parallel light tube lens 37 it is become directional light, see through polarized light and select element 38, focused on by object lens 42, the substrate by CD is radiated on the signal recording surface 5.After being selected element 38 and parallel light tube lens 37 by signal recording surface 5 laser light reflected bundles by object lens 42, polarized light, return half-reflecting mirror 36, half of light beam sees through on half-reflecting mirror 36, is focused on the photodetector 43, thereby is detected.
In addition, it is with the polarized light filter 40 that two sheet glass 39 will be arranged on the outer peripheral portion that the is equivalent to laser beam formation that is clipped in the middle that polarized light is selected element 38, the light filter 41 that does not have polarization characteristic is arranged on the middle body of laser beam.Polarized light filter 40 has the characteristic that the laser beam of the polarization direction that only makes regulation sees through, and in Fig. 4, only makes along the laser beam that is parallel to paper direction polarization to see through.Therefore, polarized light selects element 38 to have characteristic shown in Figure 6.That is, polarized light selects the peripheral part 38a of element 38 to utilize polarized light filter 40, only makes along the laser beam of horizontal direction polarization among the figure to see through, and the polarization direction of interior perimembranous 38b and laser beam irrespectively makes laser beam see through.Though polarized light filter 40 sees through the laser beam of along continuous straight runs polarization, its transmissivity is about 70～90%.Therefore, if be not provided with at any light filter of interior perimembranous 38b, then laser beam is different in the transmissivity of interior perimembranous and peripheral part, and this becomes makes the reproducing characteristic main reasons for decrease.Therefore, be necessary light filter 41 is arranged on the interior circumferential portion that polarized light is selected element 38.
The substrate thickness of explanation signal reading face one side is the reproduction operation of the DVD-dual layer of 0.6mm now.When making DVD-dual layer regeneration, voltage is added on the plane of polarization rotating element 32 from laser drive circuit 44.Its result, the wavelength that is parallel to paper direction polarization from the edge of semiconductor laser 31 is that the laser beam of 635nm is utilized plane of polarization rotating element 32, its plane of polarization does not directly see through with not being rotated, by diffraction grating 35, incides on the half-reflecting mirror 36.Half is reflected the laser beam of this incident on half-reflecting mirror 36, by parallel light tube lens 37 it is become directional light, utilize polarized light to select element 38 that its outer peripheral portion is not covered and see through all sidedly, focused on by object lens 42, the substrate 2 by DVD-dual layer 1 is radiated on the signal recording surface 5 again.The spot diameter that is radiated at the laser beam on the signal recording surface 5 is 0.9 (allowed band: 0.80～1.0) μ m.After this work is identical with the explanation of Fig. 3, so do not repeat its explanation.
Secondly, illustrate that the substrate thickness that signal reads side is the reproduction operation of the CD of 1.2mm.Make CD when regeneration, making alive not on plane of polarization rotating element 32.Its result, the wavelength that is parallel to paper direction polarization from the edge of semiconductor laser 31 is that the laser beam of 635nm is utilized plane of polarization rotating element 32, sees through after making its plane of polarization half-twist, by diffraction grating, incides on the half-reflecting mirror 36.Half of the laser beam of this incident reflected by half-reflecting mirror 36, by parallel light tube lens 37 it is become directional light, utilize polarized light to select 38 of elements that its outer peripheral portion is covered, focus on, be radiated on the signal recording surface 24 behind the substrate 21 by CD20 through object lens 42.0.55～0.65), beam effective diameter is under the situation of object lens of 4mm (the allowed band: that is 0.60 in numerical aperture, making polarized light select the diameter of the interior perimembranous 38b of element 38 is 2.3 (permissible error is ± 0.2) mm, is 0.35 (allowed band: 0.30～0.40) so that make the actual numerical value aperture.In addition, under the situation beyond beam effective diameter is 4mm,, be 0.35 so that make the actual numerical value aperture according to the diameter of the definite interior perimembranous 38b of this ratio.In addition, the laser beam spots diameter that is radiated on the signal record 24 is 1.5 (allowed bands: 1.4～1.6) μ m.After this work is identical with the explanation of Fig. 3, so do not repeat its explanation.
With reference to Fig. 7, the optical disc apparatus of the interchangeable regeneration of CD that substrate thickness is different is described.Utilize the object lens 42 in the governor motion 47 control optical pickup units 60, so that on the magnetic track that the signal that laser beam is focused on desire regeneration forms as the hole row, the substrate 2 by CD is radiated on the signal recording surface 5.Detect by signal recording surface 5 laser light reflected bundles with photodetector 43, detect as regenerated signal.The regenerated signal that detects with photodetector 43 is fed to prime amplifier 45, after the amplification of stipulating, is fed to decision circuitry 48, RF demodulator circuit 53 and servo circuit 46.Servo circuit 46 is according to the tracking error signal of being sent here, regulating and controlling mechanism 47.In addition, decision circuitry 48 is discerned the kind of the CD of installing in the regenerating unit according to the signal of being sent here, and gives instruction circuit 49 with recognition result.In order to switch the numerical aperture of object lens 42, so that be suitable for the CD discerned, instruction circuit 49 is exported to NA commutation circuit 50 according to the recognition result of sending here with instruction.In addition, in order to switch to the demodulator circuit of the regeneration that is suitable for the CD discerned, instruction circuit 49 is according to the recognition result of sending here, also instruction is exported to the actual numerical value aperture that characteristic commutation circuit 51.NA commutation circuit 50 is switched object lens 42 by liquid crystal display drive circuit 44, characteristic commutation circuit 51 is switched RF demodulator circuit 53.
Fig. 8 is that expression is the block diagram of all structures of optical disc apparatus of this example 1 at center with the focus carry circuit 46a in the servo circuit shown in Figure 7 46.With reference to Fig. 8, focus carry circuit 46a has: to carry out the A/D transformation component 54 of AD conversion from the output signal of prime amplifier 45; The digital signal processor (DSP) 55 of program according to the rules to handling from the output signal of A/D transformation component 54; Storage makes the ROM (read-only memory) (ROM) 56 of the program of DSP55 work usefulness etc.; The random-access memory (ram) 57 that the look-up table that storage is made and is used by DSP55 is used; To carry out the D/A transformation component 58 of DA conversion from the output signal of DSP55; And response drives the driver 59 of the governor motion 47 in the optical pickup unit 60 from the output signal of D/A transformation component 58.
As shown in Figure 9, governor motion 47 comprises: the lens carrier 701 that keeps object lens 42; Be looped around lens carrier 701 focusing coil 702 on every side; Be installed in tracking coil 703a and 703b on the both ends of the surface of focusing coil 702 along the Y direction; Be installed in four spring leafs 704 on the both ends of the surface of lens carrier 701 along directions X; The fixed mount 705 of support spring sheet 704; Be inserted into the yoke 707 in two recesses 706 of lens carrier 701 respectively; The permanent magnet 708 in the magnetic field that generation is vertical with respect to focusing coil 702 and tracking coil 703a, 703b; Support the yoke 709 of permanent magnet 708; And the yoke base 710 of supporting yoke 707,709.
As shown in figure 10, driver 59 comprises resistor 61, capacitor 63, switch 65 and amplifier 62.Under the situation of carrying out focus servo control, switch 65 is positioned at terminal 66 1 sides, and focus error signal FE is directly supplied with the non-inverting input of amplifier 62.Therefore, amplifier 62 response focus error signal FE supply with focusing coil 702 with focus driving voltages, utilize governor motion 47 that object lens 42 are moved along the Z direction.On the other hand, under the situation of carrying out the focus transfer, switch 65 is positioned at terminal 67 1 sides, and the voltage of the tie point of resistor 61 and capacitor 63 is supplied to the non-inverting input of amplifier 62.Meanwhile, indicate the focus of carrying out the focus transfer to shift the inverting input that indicator signal JP is supplied to amplifier 62.
Focus jump routine shown in Figure 11 is stored among the ROM56 shown in Figure 8.
Secondly, with reference to Figure 11 and Figure 12 A～12C the focus transfer work of carrying out according to this example 1 is described.
If CD is packed in the regenerating unit, then after having carried out focus servo and tracking servo, make the rotating speed rotation of CD with regulation, make signal from optical disc reproducing.Even after not carrying out focus servo and tracking servo, also can make the rotating speed rotation of CD with regulation, also can after having carried out focus servo, make CD begin rotation.In the regeneration of DVD-dual layer, laser beam is focused on any one face in signal recording surface 5 and 9, for example focus on the signal recording surface 5, make signal regeneration., from the process of signal recording surface 5 regeneration, suppose when making signal at signal, focus is transferred on the signal recording surface 9 from signal recording surface 5, be necessary to carry out again focus servo, laser beam is focused on the signal recording surface 9 from signal recording surface 9 regeneration.Utilize the focus carry circuit 46a in the servo circuit shown in Figure 7 46, regulating and controlling mechanism 47 carries out focus and shifts.
If object lens 42 are moved along the normal direction of signal recording surface, then shown in Figure 12 A, roughly S-shaped focus error signal FE takes place.P1 among Figure 12 A and P2 are respectively the focal positions on signal recording surface 5 and 9.Can obtain the such focus error signal of S1 from signal recording surface 5.Can obtain the such focus error signal of S2 from signal recording surface 9.Object lens 42 are positioned at focusing point P1 in the regenerative process of signal recording surface 5.In that focus is transferred to from signal recording surface 5 under the situation on the signal recording surface 9, the acceleration pulse shown in Figure 12 B is added on the governor motion 47.When the position of object lens 42 point of arrival P3, can obtain the such focus error signal FE of S2.
In the past, when object lens 42 have arrived some P3, object lens 42 were slowed down, stopped at the focusing point P2 of signal recording surface 9, and came like this object lens 42 are controlled., during the transfer shown in Figure 12 A, comprise noise shown in Figure 1 in the Ttran.Therefore, although to desiring the focusing point is quickened from the object lens 42 that signal recording surface 5 moves to signal recording surface 9, retardation is indeterminate.Therefore, be difficult to make object lens 42 to stop at focusing point P2.
Therefore, in this example 1, when object lens 42 are between the some P2 of focus error signal FE and P3, be applied in the acceleration pulse shown in Figure 12 B (S1).Therefore, object lens 42 begin to move to focusing point P2 from focusing point P1, but during this period, focus error signal FE is taken into DSP55 (S2).In DSP55, this focus error signal FE that is taken into and predetermined threshold value Vcomp are compared (S3).If focus error signal FE is bigger than threshold value Vcomp, just apply the deceleration pulse shown in Figure 12 C (S4).Here, threshold value Vcomp is set between the zero level and peak level of focus error signal FE.Therefore, object lens 42 slow down between some P3 that the focus error signal FE from signal recording surface 9 is begun to observe and focusing point P2.Object lens 42 begin to carry out focus servo after arriving focusing point P2 again.
Here, during focus error signal FE is from a P3 to peaking, begin to apply deceleration pulse, but during also can be, begin to apply deceleration pulse from peak value to a P2.Apply deceleration pulse in different positions, supply with the magnitude of current difference of focusing coil 702.That is, when beginning to apply deceleration pulse, need to supply with bigger electric current in the near position of distance focusing point P2.
More than illustrated to make focus transfer to the situation of signal recording surface 9, but conversely, made situation that focus transfers to signal recording surface 5 from signal recording surface 9 too from signal recording surface 5.
In order to control the period that applies of acceleration pulse clearly, also can apply deceleration pulse according to this threshold value to the poor setting threshold of the peak value of focus error signal FE.Here, threshold value Vcomp and-Vcomp is poor with respect to the peak value of focus error signal FE, be set in 0～100% the scope.Focus is transferred to from signal recording surface 5 under the situation of signal recording surface 9, the level of focus error signal FE is moved to the direction of arrow 14 from a P3, when surpassing threshold value Vcomp, applying deceleration pulse.On the other hand, focus is transferred under the situation of signal recording surface 5 from signal recording surface 9, used threshold value-Vcomp.In the case, carrying out focus when object lens 42 are positioned at focusing point P2 shifts.Therefore object lens 42 move to the some P4 of the focus error signal of the S1 that obtains from signal recording surface 5.After this level of focus error signal FE moves along the direction of arrow 15, so apply deceleration pulse when surpassing threshold value-Vcomp.In addition, after the difference of the peak value of mensuration focus error signal, setting threshold Vcomp reaches-Vcomp.
In addition, also can determine the voltage of deceleration pulse according to shifting to count to focus error signal FE and reach time till the threshold value Vcomp from beginning to carry out focus.For example, put P1 from focusing under the situation that focusing point P2 moves at object lens 42, measure in advance to shift and begin to reach time till the threshold value Vcomp and the time till reach for the second time at first,, determine the voltage of deceleration pulse according to the time of this mensuration to focus error signal FE from focus.
With reference to Figure 13 and Figure 14 A～14C, if object lens 42 apply acceleration pulse when being positioned at focusing point P1.Then object lens 42 just move to focusing point P2.If focus error signal FE reaches threshold value Vcomp, just apply the deceleration pulse of the voltage Vbrk1 corresponding with time t1.After if focus error signal FE surpasses threshold value Vcomp, when reaching threshold value Vcomp once more, just apply the deceleration pulse of the voltage Vbrk2 corresponding with time t2.Voltage Vbrk2 is set than voltage Vbrk1 is little for the first time for the second time.The scope of these voltage Vbrk1, Vbrk2 is 1～2V.In that focus is transferred to from signal recording surface 9 under the situation of signal recording surface 5, can adopt in such a way equally.
Above basis begins to reach time t1 or t2 till the threshold value Vcomp to focus error signal FE from applying acceleration pulse, has determined the voltage Vbrk1 or the Vbrk2 of deceleration pulse, but also can determine the application time of deceleration pulse according to time t1 or t2.
With reference to Figure 15 and Figure 16 A～16C, if object lens 42 apply acceleration pulse when being positioned at focusing point P1.Then object lens 42 just move to focusing point P2.If focus error signal FE surpasses threshold value Vcomp, just only with time t1 time corresponding Tbrk1 in apply deceleration pulse.After if focus error signal FE surpasses threshold value Vcomp, when reaching threshold value Vcomp once more, just only with time t2 time corresponding Tbrk2 in apply deceleration pulse.The application time Tbrk2 of deceleration pulse is set shortlyer than primary application time Tbrk1 for the second time.These application times Tbrk1, Tbrk2 are 1 Millisecond.In that focus is transferred to from signal recording surface 9 under the situation of signal recording surface 5, can adopt in such a way equally.
In addition, if setting threshold as mentioned above applies deceleration pulse, just can judge whether to have carried out the focus transfer from a certain signal recording surface.Promptly, if focus error signal FE applies deceleration pulse when having surpassed threshold value Vcomp, then can conclude from signal recording surface 5 and shift to the focus that signal recording surface 9 carries out, if focus error signal FE applies deceleration pulse when having surpassed threshold value-Vcomp, then can conclude from signal recording surface 9 and shift to the focus that signal recording surface 5 carries out.
The situation of the DVD-dual layer with two signal recording surfaces more than has been described, but has the invention is not restricted to this, also can be applicable to DVD with the signal recording surface more than three.
If adopt above-mentioned example 1, then, when having reached predetermined threshold value, focus error signal applies acceleration pulse owing to can exchange in the optical disk reproducing apparatus of regeneration at CD and DVD-dual layer, shift so can carry out correct focus.
In addition, in above-mentioned example 1, though when focus error signal FE has reached the threshold value Vcomp of regulation, apply deceleration pulse, but also can replace following method, promptly measure in advance from applying acceleration pulse and begin to reach time t1 or t2 till the threshold value Vcomp of regulation to focus error signal FE, after carrying out under the situation that focus shifts, after applying acceleration pulse, having passed through the time t1 or t2 of this mensuration, apply deceleration pulse.
In addition, also the program shown in the process flow diagram among Figure 17 can be deposited in and replace said procedure among the ROMS6.
In the case, with reference to Figure 17 and Figure 18 A～18D, shift if carry out focus from focusing point P1 to a focusing point P2, then at first will gain is that 1 acceleration pulse is added on the governor motion 47, so object lens 42 are sharply quickened.When then focus error signal FE has arrived zero cross point (some P4), acceleration pulse apply end.
Then to apply gain be 1.5 deceleration pulse to the some P3 that begins sharply to increase at focus error signal FE, so object lens 42 are a significant slowdown.If then focus error signal FE has reached threshold value Vcomp (some P5), then the gain of deceleration pulse drops to 1.25.If then focus error signal FE reaches peak value (some P6), then the gain of deceleration pulse further drops to 0.75.If then focus error signal FE has reached threshold value Vcomp (some P7) again, then the gain of deceleration pulse further drops to 0.5.If last focus error signal FE arrives zero cross point (some P2), then deceleration pulse applies end.
Gain corresponding with each point and threshold value Vcomp are deposited among the RAM57 shown in Figure 8.
As mentioned above,, after this reduce the voltage of deceleration pulse by stages, so after object lens 42 slow down sharp, at leisure near the focusing point owing to apply the deceleration pulse of the voltage bigger at first than acceleration pulse.Its result can shorten the time that focus shifts, and object lens 42 are converged in the focusing point reliably simultaneously.
In addition, also can replace said procedure, and the program shown in the flow process among Figure 19 is deposited among the ROM56 shown in Figure 8.At this moment shown in Figure 20 A～20C, the voltage Vbrk2 that reaches maximum after-applied deceleration pulse at the variable quantity of focus error signal FE determines according to the maximal value DFEmax of differential focus error signal DFE.The relation of the maximal value DFEmax of the voltage Vbrk2 of deceleration pulse and differential focus error signal DFE is shown in Figure 21 for the second time.Such relation is deposited among the RAM57 shown in Figure 8 as look-up table.
With reference to Figure 19 and Figure 20 A～20C, carrying out at first applying the acceleration pulse that voltage is Vacc under the situation of focus transfer from N layer to the (N+1) layer.Move to (N+1) layer so the focusing of object lens 42 point begins to leave the N layer, initial focus error signal FE appears at minus side.If focusing point is near (N+1) layer, then the focus error signal FE of (N+1) layer appears at positive side.
If focus error signal FE surpasses threshold value Vcomp, then apply deceleration pulse and replace acceleration pulse.At this moment, threshold value Vcomp is set to such an extent that get final product by positive side slightly than zero level.The voltage Vbrk1 of the deceleration pulse that applies at first can preestablish.Focus error signal FE by differential, calculates differential focus error signal DFE in DSP55.
If differential focus error signal DFE reaches maximal value DFEmax, just the look-up table from RAM57 is read the voltage Vbrk2 corresponding with this maximal value DFEmax.Look-up table can not be stored among the RAM57 yet, and is stored among the ROM56.Because the focus error signal of maximal value DFEmax when to be focus error signal FE ascending velocity maximum, so when the translational speed of object lens 42 was big, it is big that maximal value DFEmax becomes, the translational speed of object lens 42 hour, maximal value DFEmax diminishes.When maximal value DFEmax was big, voltage Vbrk2 was set greatly, was set for a short time in maximal value DFEmax hour.That is, focusing point is near (N+1) layer the time, and under the big situation of the translational speed of object lens 42, the voltage Vbrk2 of deceleration pulse is set greatly, and under the little situation of the translational speed of object lens 42, the voltage Vbrk2 of deceleration pulse is set for a short time.
If read the voltage Vbrk2 of the deceleration pulse corresponding like this from look-up table, just apply the deceleration pulse that this voltage is Vbrk2 with the maximal value DFEmax of differential focus error signal DFE.
Then clock is reset to 0, if the value t of clock through preset time Tbrk, then voltage be Vbrk2 deceleration pulse apply end.Then, begin to carry out focus servo control, control focusing point desires to focus on the object lens 42 on (N+1) layer.At this moment, become time till maximum beginning to focusing point arrives (N+1) layer from differential focus error signal DFE, can determine time T brk by prediction.
In addition, though here according to the clock measuring voltage be Vbrk2 deceleration pulse apply the period that finishes and switch to focus servo, but also can for example become than threshold value Vcomp hour, finish applying of deceleration pulse, switch to focus servo at focus error signal FE.
If adopt example 1 as described above, then because the translational speed of object lens 42 when big, the voltage of deceleration pulse is set greatly, the translational speed of object lens 42 hour, the voltage of deceleration pulse is set for a short time, so the focusing point of object lens 42 accurately and promptly can be focused on (N+1) layer.
[example 2]
In existing optical disc apparatus, under the address of given destination as target and situation as the layer information of target, at first with focus after present layer is transferred to layer as target, control by the feed mechanism of adapter, so that seek destination address.
, because DVD can carry out high density recording,, require access destination address as quickly as possible so it is very big to be used as the possibility that the storer of computing machine uses., in existing method, carried out just controlling after focus shifts and sought destination address, so there is the long problem of time of visit usefulness.
Therefore, the fundamental purpose of example 2 of the present invention is to provide a kind of searching of carrying out focus transfer and destination address simultaneously, can shorten the optical disc apparatus of access time.
Figure 22 is the block diagram of expression example 2 of the present invention.In Figure 22, the DVD-dual layer 1 that single face reads utilizes spindle motor 16 to be rotated driving, the information of sharp all adapter 60 reading and recording on dish 1.Export signals such as focus error signal FE from adapter 60, after amplifying with prime amplifier 45, supply with A/D transformation component 54, simulating signal is transformed into digital signal.This digital signal is fed to DSP (digital signal processor) 55.
On DSP55, connecting ROM56 and RAM57.The program that ROM56 storage control DSP55 uses, the RAM57 storage is from coiling 1 information that obtains.DSP55 carries out program stored among the ROM56, according to canned data among the RAM57, utilizes signal for faster or reduce-speed sign, makes adapter 60 carry out the control that focus servo is used, and makes adapter 60 seek the control of usefulness simultaneously.DSP55 exports to D/A transformation component 58 with the digital signal that focus shifts control usefulness, and D/A transformation component 58 becomes simulating signal with this digital signal conversion, and supplies with driver 59.Driver 59 utilizes signal for faster and reduce-speed sign control adapter 60
In addition, DSP55 seeks in order to make adapter 60, and output PWM (Pulse WideModulation) signal is supplied with integrator 11.Integrator 11 is supplied with driver 12 as the screw drive signal after with the pwm signal integration, and driver 12 utilizes this screw drive signal, drives feed mechanism 13, and adapter 60 is sought.
Figure 23 is the process flow diagram of the work usefulness of explanation example 2 of the present invention, and Figure 24, Figure 25 A and 25B are the key diagrams that the focus in the explanation example 2 of the present invention shifted and sought the work usefulness of destination address.
Secondly, with reference to Figure 22～Figure 25 A and 25B, the concrete work of example 2 of the present invention is described.If from the address of the destination of outside supply dish 1 with as the layer information of target, then adapter 60 obtains the position and the layer information of addressing, DSP55 calculates the amount of movement from the present position to the target location.For example, as shown in figure 24, adapter 60 now focuses on the a2 point of semitransparent type recording layer 2, according to instruction, if supplied with the instruction of using on the a1 point that focuses on reflection-type recording layer 1, just calculate the amount of movement of ordering to a1 from the a2 point from the outside, DSP55 will be after will disconnecting to the energising of tracking coil 703a, 703b shown in Figure 9, pwm signal is exported to integrator 11, integrator 11 with this pwm signal integration after, the screw drive signal shown in the output map 25B.Driver 12 utilizes this screw drive signal, drives feed mechanism 13.Therefore, adapter 60 utilizes feed mechanism 13 to begin to move.
When exporting with pwm signal, DSP exports to D/A transformation component 58 with focus error signal FE.This focus error signal FE is transformed into simulating signal by D/A transformation component 58, and supplies with driver 59.Driver 59 makes adapter 60 begin to carry out focus and shifts according to the focus error signal FE of this simulating signal formula.Therefore, adapter 60 moves to reflection-type recording layer 1 as the second layer from the semitransparent type recording layer 2 as ground floor, finishes focus and shifts.
At this moment, DSP55 judges whether adapter 60 has arrived the a1 point of reflection-type recording layer 1, if no show continues output screw drive signal.Then,, make the mobile end that is undertaken by feed mechanism 13, transfer on the reflection-type recording layer 1 on the appointed magnetic track, begin to follow the tracks of, arrive address as target if adapter 60 arrives near the destination addresses.
As mentioned above, if adopt this example 2, then owing to utilize the screw drive signal, the address that adapter 60 is sought as target, on one side according to focus error signal FE, make adapter that focus is transferred to the second layer from ground floor,, can improve value as the storer of computing machine so can shorten the access time.
As mentioned above, if adopt this example 2, then because along with having supplied with as the address of target and the information of layer, information calculations amount of movement according to present address and layer, drive unit is driven,, generate signal for faster simultaneously so that make information readout device only move the amount of movement that is calculated, so that focus on as target the layer signal recording surface on, so can shorten the access time.
[example 3]
In above-mentioned dual layer discs, in fact the distance between it is two-layer is not uniformly in the scope of whole dish, therefore has following problem.
Figure 26 is the sectional view of the structure of the actual dual layer discs of making of expression.In addition, this sectional view is to be illustrated in the structure from the center to periphery along radius in the dual layer discs of disc.As shown in figure 26, along with the difference of manufacture method, the thickness of the ultraviolet hardening resin in interior week (middle layer 3) is 40 microns, and is different therewith, increases more the closer to perimeter thicknesses, and the thickness of the dual layer discs periphery that has becomes 60～70 microns.In addition, along with the difference of manufacture method, the dispersing between 40～70 microns of the thickness in the middle layer 3 of dish.
As mentioned above, actual dual layer discs increases from interior thoughtful periphery interfloor distance, so the above-mentioned switching point that switches to deceleration pulse from acceleration pulse is away from initial point (during ground floor regeneration), so the size one of deceleration pulse regularly, the application time of deceleration pulse is shorter than the application time of acceleration pulse.
The product that applies voltage and application time of these pulses, might be moved excessively so if the application time of deceleration pulse is shorter than the application time of acceleration pulse, adapter just can not fully prevent corresponding to the drive amount of adapter.
Example 3 of the present invention is finished in order to eliminate this problem, suitably carries out the optical disc apparatus that focus shifts when its purpose is to provide the dissimilar optical disc reproducing of a kind of distance between two-layer.
Figure 27 is the structured flowchart of the optical disc apparatus of expression example 3 of the present invention.
As shown in figure 27, this optical disc apparatus has: the spindle motor 16 that makes the DVD1 rotation that the single face that is installed reads; Laser beam irradiation on dual layer discs 1, is read the information that is recorded on the dual layer discs 1 by detecting its reflected light,, control to the adapter (PU) 60 of the vertical range between the dual layer discs 1 by the governor motion 47 that install inside; Amplification is from the prime amplifier 45 of the signals such as focus error signal FE of adapter 60 outputs; To be transformed into the A/D transformation component 54 of digital signal from the simulating signal of prime amplifier 45 outputs; Storage is from the random-access memory (ram) 57 of the information of dual layer discs 1 acquisition; To from the information stores of the digital signal of A/D transformation component 54 output among RAM57, generate the digital signal processor (DSP) 55 of the digital signal of the position of specifying adapter 60 simultaneously according to canned data among the RAM57; The program that storage control DSP55 uses read private memory (ROM) 56; To become the D/A transformation component 58 of simulating signal from the digital signal conversion of DSP55 output; And according to signal from 58 outputs of D/A transformation component, generate signal for faster and reduce-speed sign, by will speed up signal supply governor motion 47 adapter 60 is moved, simultaneously by reduce-speed sign being supplied with the driver 59 that governor motion 47 prevents adapter 60 to move.
Secondly, the working condition of the optical disc apparatus of this example 3 is described.
At first, this optical disc apparatus detects in the dual layer discs that installs in the distance that has write down to the different a plurality of points of the distance at center between information two-layer.
Figure 28 and Figure 29 A～29C are the figure that the distance detection method of explanation between two-layer used.
Shown in Figure 28 and Figure 29 A～29C, adapter 60 for example moves according to the order that reads week, periphery DVD-dual layer 1 interior thoughtful from single face, detects focus error signal FE at each point.Here, the distance (time) between positive peak P3, the P4 of focus error signal FE is shown in Figure 29 A～29C, and the distance between two-layer is big more the closer to periphery.
Below, with reference to the flow process among Figure 30 A, specify the distance detection work between two-layer.
At first, in step S1, judge the kind of the CD that installs.
Secondly, judge in step S2 whether the CD that installs is two-layer equation digital video disc (DVD-Dual), if DVD-dual layer just enters step S3.
In step S3, make adapter 60 move to the interior week of dual layer discs 1, in step S4, change the distance between adapter 60 and the dual layer discs 1, and meanwhile with laser beam irradiation on dual layer discs 1, begin to measure its catoptrical focusing retrieval.
In step S5, the focus error signal FE that obtains according to the mensuration of carrying out in step S4 calculates distance between the ground floor and the second layer by DSP55.
In step S6, will deposit among the RAM57 together with the address information that expression locates by the distance that DSP55 calculates.
In step S7, finish to focus on retrieval, in step S8, adapter 60 is moved to the middle week of the dual layer discs 1 that installs.
Change locates on one side in step S9, Yi Bian carry out the work from above-mentioned steps S4 to step S7 repeatedly, adapter 60 is moved to the periphery of the dual layer discs 1 that installs in step S10.
Below, from step S11 to step S14, carry out work once more repeatedly from step S4 to step S7, in step S15, finish to detect the program of the distance between two-layer in periphery.
DSP55 and the ROM56 that controls it are like this in the distance that detects to the different a plurality of points of the distance at center on the dual layer discs 1 that installs between two-layer.
In addition, though above-mentioned explanation is about detecting the situation of the distance between two-layer the interior week of dual layer discs 1, middle week, periphery 3, following table 2 shows at 34 and detects the distance between two-layer and deposit it one of specifying information example of the situation among the RAM57 in.
Table 2
| Numbering | Radius (mm) | Track number | Distance between the ground floor and the second layer (micron) |
| 1 | 25 | 40245 | 30.0 |
| 2 | 26 | 82134 | 30.0 |
| 3 | 27 | 125665 | 30.0 |
| 4 | 28 | 170839 | 30.0 |
| 5 | 29 | 217656 | 30.0 |
| 6 | 30 | 266115 | 30.0 |
| 7 | 31 | 316217 | 31.3 |
| 8 | 32 | 367962 | 32.7 |
| 9 | 33 | 421349 | 34.0 |
| 10 | 34 | 476379 | 35.3 |
| 11 | 35 | 533052 | 36.7 |
| 12 | 36 | 591368 | 40.7 |
| 13 | 37 | 651326 | 44.7 |
| 14 | 38 | 712927 | 48.7 |
| 15 | 39 | 776170 | 52.7 |
| 16 | 40 | 841056 | 56.7 |
| 17 | 41 | 907585 | 58.0 |
| 18 | 42 | 975757 | 59.3 |
| 19 | 43 | 1045571 | 60.7 |
| 20 | 44 | 1117028 | 62.0 |
| 21 | 45 | 1190128 | 63.3 |
| 22 | 46 | 1264870 | 64.7 |
| 23 | 47 | 1341255 | 66.0 |
| 24 | 48 | 1419283 | 67.3 |
| 25 | 49 | 1498953 | 68.7 |
| 26 | 50 | 1580266 | 70.0 |
| 27 | 51 | 1663222 | 66.0 |
| 28 | 52 | 1747821 | 62.0 |
| 29 | 53 | 1834062 | 58.0 |
| 30 | 54 | 1921946 | 54.0 |
| 31 | 55 | 2011472 | 50.0 |
| 32 | 56 | 2102641 | 43.3 |
| 33 | 57 | 2195453 | 36.7 |
| 34 | 58 | 2289908 | 30.0 |
In this table 2, radius is meant the distance of the Determination of distance point to two-layer from the center of the dual layer discs 1 that installs.
Secondly, with reference to the process flow diagram shown in Figure 30 B, first example of the focus transfer work of the regeneration of carrying out the second layer in making the ground floor regenerative process of dual layer discs 1 is described.
At first in step S1, the information of address (track number) that adapter 60 is obtained the layer information of the layer that expression regenerates now and represented to make now which place regeneration of this layer from dual layer discs 1.
Secondly in step S2, DSP55 is according to above-mentioned address information, and according to the proportional distribution that obtains from the data that originally were stored in the RAM57, calculate the interfloor distance of this position, and calculating makes desire that the adapter 60 that light beam focuses on the desirable layer is moved the acceleration pulse of usefulness and prevents this deceleration pulse that moves usefulness gain separately.
In step S3, according to the result of calculation in step S2, digital signal is exported to D/A transformation component 58 from DSP55, and the acceleration pulse driver 23 with the gain of calculating in step S2 is supplied with the governor motion 47 of adapter 60.
In step S4, follow moving of adapter 60, measure the variation of focus error signal FE, judge whether the size of focus error signal FE has surpassed threshold value.
At this moment, under the situation that has surpassed threshold value, enter next step S5.
In step S5, according to the result of calculation in step S2, digital signal is exported to D/A transformation component 58 from DSP55, and the deceleration pulse with the gain of calculating in step S2 is supplied with the governor motion 47 of adapter 60 by driver 23.
In step S6, judge by adapter 60 whether the focus error signal FE that is obtained becomes 0 level.At this moment, detecting under the situation of point (zero cross point) that focus error signal FE becomes 0 level, enter next step S7, the deceleration that adapter 60 moves finishes.
Figure 31 A～31C and Figure 32 A～32C are respectively that explanation is carried out the figure that focus shifts usefulness in the interior week and the periphery of dual layer discs 1.
Shown in Figure 31 A～31C, in the interior week of dual layer discs 1, the moment (or position) T1 that surpasses the threshold value that is set at focus error signal FE, the signal of supplying with governor motion 47 is switched to deceleration pulse from acceleration pulse, and above-mentioned threshold value is set to 20% the size of poor (P6-P5) of two different peak values of the polarity of focus error signal FE.
That is, in Figure 31 A～31C, will speed up pulse from initial point to T1 and supply with governor motion 47, deceleration pulse is supplied with governor motion 47 from T1 to T2.Here, make the amplitude of these two pulses identical, area A 3 corresponding with the drive amount of adapter 60 and area A 4 equate.
Different therewith, shown in Figure 32 A～32C since write down distance between information two-layer in the periphery of dual layer discs 1 than big in interior week, so the time (distance) from the peak value P5 of focus error signal FE to peak value P6 become greatly.And the moment T3 that focus error signal FE surpasses threshold value also lags behind than the T1 shown in Figure 31 A-31C.
Therefore, because the amplitude of acceleration pulse is identical with the situation shown in Fig. 5 B, so acceleration pulse is with big to the corresponding area A 5 specific area A3 of the drive amount of adapter 60.In the case, identical with the situation in the interior week shown in Figure 31 A～31C, surpass the T3 of threshold value to zero cross point T4 from focus error signal FE, only will have with the deceleration pulse of acceleration pulse same-amplitude and supply with governor motion 47, so because the effect of deceleration pulse, the prevention drive amount identical with the drive amount of acceleration pulse generation do not supplied with adapter 60.So, shown in Figure 32 C, make during from T3 to T4 the gain of deceleration pulse rise to the size of calculating by DSP55, so that deceleration pulse forms the area A 6 with area A 5 identical sizes.Its result, the adapter 60 that is quickened by acceleration pulse utilizes deceleration pulse to slow down reliably, can excessively not move and can suitably prevent.At this moment, the size of change deceleration pulse makes the acceleration of adapter 60 decelerations corresponding to change.
In addition, equally also can consider the acceleration that adapter 60 is quickened by changing the size of acceleration pulse, changing.
Secondly, with reference to process flow diagram shown in Figure 33, second example of focus transfer work is described.
In step S1, adapter 60 is obtained the expression present value address information and the layer information of the position of regeneration now, and this point is identical with first example of above-mentioned focus transfer work.
Secondly, utilize the address information that is obtained by adapter 60 in step S2, DSP55 is according to the range data that is stored in advance between two-layer among the RAM57, proportionally Distribution Calculation acceleration-deceleration switching point (hereinafter to be referred as " switching point ").Here, so-called switching point is meant that the signal that will supply with governor motion 47 switches to moment (position) of deceleration pulse from acceleration pulse, specifically, can be set at the mid point of two different peak values of the polarity of the focus error signal FE that tries to achieve by calculating.
In step S3, apply acceleration pulse to governor motion 47 from driver 23.
In step S4, whether reached switching point after judging the mobile beginning of adapter 60, execution in step S5 under situation about having reached.
In step S5, if stop to supply with acceleration pulse to governor motion 47, then deceleration pulse is supplied to governor motion 47 simultaneously.
In step S6, whether the size of detection of focus error signal FE has reached preset threshold, under the situation that has reached threshold value, and execution in step S7.
In step S7, judge whether the size of focus error signal FE becomes 0 (detection zero cross point) once more.Detecting under the situation of zero cross point, in step S8, finish to supply with deceleration pulse to governor motion 47, prevent adapter 60.
Figure 34 A～34C and Figure 35 A～35C are respectively the key diagrams that focus transfer work that explanation is carried out in the interior week and the periphery of dual layer discs 1 is used.
Shown in Figure 34 A～34C, the middle T6 constantly that has moment T5, the T7 of two different cutting edge of a knife or a sword values of polarity at focus error signal FE, switched to deceleration pulse to governor motion 47 signal supplied from acceleration pulse, and area A 7 shown in Figure 34 B and Figure 34 C difference and area A 8 are equated.In addition, shown in Figure 35 A～35C, in periphery, time (distance) T9～T11 between the polarity of focus error signal FE different two cutting edge of a knife or a sword value T7, T8 is than the big this point of (distance) T5～T7 of interior all following time of situation shown in Figure 34 A～34C, and other is all identical.
That is, the signal of supplying with governor motion 47 from driver 59 is switched to deceleration pulse at the mid point T10 of the polarity of focus error signal FE different two cutting edge of a knife or a sword value T7, T8 from acceleration pulse, and area A 9 that Figure 35 B and 35C illustrate respectively and area 10 equate.
In addition, the signal that driver 59 is supplied with governor motion 47 suitably changes the size of these pulses from acceleration pulse to the switching of deceleration pulse, and any time between the polarity of focus error signal FE different two cutting edge of a knife or a sword value T7, T8 is considered when switching too.
In addition, the polarity of acceleration pulse in above-mentioned Figure 31 A～31C, Figure 32 A～32C, Figure 34 A～34C, Figure 35 A～35C and their explanation or deceleration pulse is to be determined by the moving direction of adapter 60 with respect to dual layer discs 1.
In addition, more generally, the dual layer discs 1 of above-mentioned explanation can illustrate too with the multilayer disc that can record the information in the multilayer certainly.As mentioned above,, then in a plurality of layers, write down in the CD of information,, also can suitably realize the focusing correction (focus transfer) of different layers regeneration usefulness even under the dissimilar situation of interfloor distance if adopt example 3.In addition, can avoid moving excessively of information readout device.In addition, can also prevent moving of object lens with variable speed.
[example 4]
Because it is that the mechanical means that the governor motion that utilizes focus servo control to use makes object lens move along optical axis direction carries out that in the past focus shifts, so that the focusing of laser beam o'clock to move to the time that another recording layer needs from a recording layer long, in addition, conventional device also breaks down easily.
In addition, in fact the distance between double-layer CD two-layer is not uniformly in the scope of whole dish, has discrete along radial direction.Therefore, to carry out that focus shifts all be difficult to any correct position ground in double-layer CD.
Example of the present invention 4 is finished in order to address the above problem, and its purpose is to provide a kind of can carry out the optical disc apparatus that focus shifts rapidly.Another purpose is to provide a kind of any position in CD can both correctly carry out the optical disc apparatus that focus shifts.
Figure 36 is the block diagram of all structures of the optical disc apparatus of expression example 4 of the present invention.With reference to Figure 36, the optical disc apparatus of regeneration with double-layer CD 1 of two recording layers has: the spindle motor 16 that makes double-layer CD 1 rotation; Laser beam irradiation on double-layer CD 1, is read the optical pickup unit (PU) 70 that is recorded in the information on the double-layer CD 1; Amplification is from the prime amplifier 45 of optical pickup unit 70 regenerated signal RF, focus error signal FE and tracking error signal TE; To carry out the A/D transformation component 54 of AD conversion from the output signal of prime amplifier 45; Program according to the rules is to the digital signal processor of handling from the output signal of A/D transformation component 54 (DSP) 55; Storage makes a readout memory (ROM) 56 of the program of DSP55 work usefulness etc.; The random-access memory (ram) 57 of the table that storage is made and used by DSP55 etc.; To carry out the D/A transformation component 58 of DA conversion from the output signal of DSP55; And response drives the driver 59 of the governor motion 47 in the adapter 70 from the output signal of D/A transformation component 58.
Figure 37 is the block diagram of the structure of expression optical pickup unit 70 shown in Figure 36.With reference to Figure 37, optical pickup unit 70 has: the semiconductor laser 141 that generates laser beam; Make half-reflecting mirror 142 from the laser beam vertical reflection of semiconductor laser 141; Make the many focuses parallel light tube lens 143 that are parallel or almost parallel from the laser beam of half-reflecting mirror 142; Make from the laser beam of many focuses parallel light tube lens 143 catoptron vertically upward 144 along the reflection of Z (optical axises of object lens 145) direction; To focus on object lens 145 on first recording layer 5 and second recording layer 9 from the laser beam of catoptron 144 vertically upward with respect to what double-layer CD 1 was provided with; Make object lens 145 along Z (optical axis) direction move, carry out focus servo control, make object lens 145 move, carry out the governor motion 47 of tracking servo control along X (tracking) direction simultaneously; Detection is seen through the photodetector 146 of the laser beam of many focuses parallel light tube lens 143 and half-reflecting mirror 142 by double-layer CD 1 reflection back; According to detection signal DE1～DE4, generate the regeneration FETE signal generating circuit 147 of regenerated signal RF, focus error signal FE and tracking error signal TE from photodetector 146; And the liquid crystal display drive circuit 148 that drives TN type liquid crystal 305 usefulness in many focuses parallel light tube lens 143.
Here, half-reflecting mirror 142, many focuses parallel light tube lens 143, vertically upward catoptron 144 and object lens 145 constitute will be from the optical system of laser beam direction double-layer CD 1 usefulness of semiconductor laser 141.
As shown in figure 38, many focuses parallel light tube lens 143 comprise lens 301; The lens 302 relative with lens 301; The transparency electrode 303 that on the inner surface of lens 301, forms; The transparency electrode 304 that on the inner surface of lens 302, forms; And be sandwiched in TN type liquid crystal 305 between transparency electrode 303 and 304.As transparency electrode 303 and 304, preferably use ITO, SnO
2, TiO
2Deng.In addition, also can replace TN type liquid crystal 305 with S TN type liquid crystal.
Liquid crystal display drive circuit 148 responses are added in the voltage of stipulating between the transparency electrode 303 and 304 of many focuses parallel light tube lens 143 from the output signal of driver shown in Figure 36 59.
Figure 39 is the refractive index of expression TN type liquid crystal 305 and the curve map that applies the relation of voltage, and Figure 40 is the curve map after the major part among Figure 39 is amplified.As Figure 39 and shown in Figure 40, the refractive index of TN type liquid crystal 305 changes along with the variation that is added in the voltage between transparency electrode 303 and 304.Therefore, the focal length of many focuses parallel light tube lens 143 changes along with the variation that applies voltage.The relation of the refractive index of distance from the substrate surface of double-layer CD 1 to the focusing point of laser beam and TN type liquid crystal 305 has been shown among Figure 41.
As shown in figure 42, photodetector 146 is cut apart sensor 601～604 by four and is constituted.Cut apart sensor 601～604 and generate detection signal DE1～DE4 according to the light income of laser beam respectively.
Regeneration FETE signal generating circuit 147 with the summation of detection signal DE1～DE4 as regenerated signal RF (DE1+DE2+DE3+DE4) output, simultaneously with detection signal DE1 and DE3's and with detection signal DE2 and DE4 and difference as focus error signal FE (=(DE1+DE3)-(DE2+DE4)) output.
Figure 43 and program shown in Figure 44 are stored among the ROM56.Flow table among Figure 43 is shown in a plurality of measurements first recording layer 5 in the double-layer CD 1 and the program of the distance between second recording layer 9.Flow process shown in Figure 44 is represented with reference to the table of measuring position of storing among the RAM57 and interfloor distance (above-mentioned table 2), determines to be added in the voltage between transparency electrode 303 and 304.
In ROM56, also storing the table shown in the following table 3.The expression of this table from the substrate surface of double-layer CD 1 to signal recording surface (recording layer) distance and be added in the relation of the voltage on the TN type liquid crystal 305.
Table 3
| Distance from the substrate surface to the record surface (mm) | Be added in the voltage (V) on the liquid crystal |
| 0.600 | 0 |
| 0.607 | 2.80 |
| 1.615 | 3.25 |
| 0.624 | 3.65 |
| 0.632 | 4.00 |
| 0.639 | 4.40 |
| 0.648 | 4.70 |
| 0.655 | 5.00 |
| 0.664 | 5.30 |
| 0.672 | 5.62 |
| 0.682 | 6.00 |
Secondly, the work of Figure 36 and optical disc apparatus shown in Figure 37 be described, reference process flow diagram shown in Figure 43 at first illustrates the surveying work method of interfloor distance.
If CD is installed on the spindle motor 16, just judge whether the CD of this installation is DVD-dual layer (S1).Under the situation of DVD-dual layer, transfer to step S3, but under the situation of non-DVD-dual layer, transfer to other step.
Then, as shown in figure 45, optical pickup unit 70 moves along the radial direction of double-layer CD 1, and the interior week (track number for " 40245 ") that stops at double-layer CD 1 (S3).Begin to carry out focus servo (S4) then in this position.More particularly, driver 59 increases or reduces the focus driving voltages that is added on the focusing coil 702 according to the indication from DSP55.Therefore object lens 42 move along its optical axis direction, from the focus error signal FE shown in the regeneration FETE signal generating circuit 147 output map 46A.Because double-layer CD 1 has two recording layers 5,9, so two sigmoid curves in focus error signal FE, occur.DSP55 calculated track number and is first recording layer 5 of " 40245 " and the distance (S5) between second recording layer 9 according to two cutting edge of a knife or a sword value P3 of such sigmoid curve shape and the time between the P4, should be apart from depositing RAM57 (S6) in track number " 40245 ".So all focus servos finish (S7) in dish.
Then, optical pickup unit 70 moves to the position (S8) of track number for " 82134 ", and the same with above-mentioned steps S4～S7, DSP55 carries out focus servo (S9).Therefore, track number deposits among the RAM57 with this track number for the interfloor distance of " 82134 ".
Equally, optical pickup unit 70 moves along radial direction, and DSP55 calculates interfloor distance in a plurality of positions in double-layer CD 1, deposits among the RAM57 this distance of calculating in (S10～S13) with the track number of this position of expression.
In Figure 45, also show the optical pickup unit 70 that stops at week in the dish for the interfloor distance in week in the measuring disk, and the optical pickup unit 70 that stops at the dish periphery for the interfloor distance of measuring disk periphery.When in addition, in dish Zhou Jinhang focus servo being shown in Figure 46 B from the focus error signal FE of regeneration FETE signal generating circuit 147 outputs.In addition, the focus error signal FE that exports from regeneration FETE signal generating circuit 147 has been shown in Figure 46 C when the dish periphery is carried out focus servo.
The above results, the table shown in the above-mentioned table 2 is deposited among the RAM57.
Secondly, with reference to Figure 37 the reproduction operation situation that optical disc apparatus carries out is described.
When at first making the information regeneration of first recording layer 5, voltage is not added between the transparency electrode 303 and 304 of many focuses parallel light tube lens 143 (voltage that adds 0V).As shown in figure 40, not during making alive the refractive index of TN type liquid crystal 305 be 1.500.Therefore, as Figure 37 and shown in Figure 47, penetrate the back from semiconductor laser 141 and become parallel beam by many focuses parallel light tube lens 143 by half-reflecting mirror 142 laser light reflected bundles.After parallel beam quilt catoptron 144 reflections vertically upward from many focuses parallel light tube lens 143, incide in the object lens 145.This collimated laser beam is focused on first recording layer 5 by object lens 145.
By object lens 145, vertically upward behind catoptron 144, the many focuses parallel light tube lens 143, get back to half-reflecting mirror 142 at laser light reflected bundle on first recording layer 5, see through half-reflecting mirror 142 again, incide on the photodetector 146.Then, in regeneration FETE signal generating circuit 147,, generate regenerated signal RF, focus error signal FE and tracking error signal TE according to detection signal DE1～DE4 from photodetector 146.
Here, for the information that directly makes second recording layer 9 in the information regeneration process that makes first recording layer 5 begins regeneration, be necessary that the focusing of the laser beam of will be undertaken by object lens 145 o'clock moves to second recording layer 9 from first recording layer 5.Shift in order to carry out such focus, DSP55 determines to be added in the suitable voltage on the TN type liquid crystal 305 according to the flow process among Figure 44.
More particularly, DSP55 reads track number (S21) the present regeneration from first recording layer 5, with reference to the table of storing among the RAM57 2, reads the interfloor distance (S22) at this track number place.Then, DSP55 calculates the distance of the substrate surface of double-layer CD 1 to the signal recording surface of second recording layer 9 according to this interfloor distance of reading, and refers again to table 3 and reads the voltage (S23) that is added on the TN type liquid crystal 305.Therefore, shift, determine the best voltage that applies in order to carry out focus on the magnetic track in regeneration now.
In addition, do not have in table 2 under the situation of the track number in the regeneration now, DSP55 reads the interfloor distance at the track number place before and after it respectively, calculates the interfloor distance at the track number place in the present regeneration by interpolation.In addition, in table 1 not under the situation of the distance from the substrate surface to the signal recording surface too, DSP55 reads the apply voltage corresponding with the distance before and after it respectively, by interpolation calculate with above-mentioned calculate apart from the corresponding voltage that applies.
After applying voltage and determining, DSP55 is by D/A transformation component 26 and driver 59, and indication liquid crystal display drive circuit 148 is added in its voltage of determining that applies between transparency electrode 303 and 304.So the voltage that applies that liquid crystal display drive circuit 148 just will be determined is added between transparency electrode 303 and 304.For example, if apply the voltage of 4.0V, then as Figure 39 and shown in Figure 40, the refractive index of TN type liquid crystal 305 changes to 1.510 from 1.500.Therefore, the focal length of many focuses parallel light tube lens 143 is elongated.
As Figure 37 and shown in Figure 48, from semiconductor laser 41 penetrate the back by half-reflecting mirror 142 laser light reflected bundles behind too much focus parallel light tube lens 143, become wideer a little than parallel.Then, this laser beam is incided on the object lens 145 by after catoptron 144 reflects vertically upward, is focused it on second recording layer 9 by object lens 42.
The laser light reflected bundle is identical with the situation of above-mentioned first recording layer 5 on second recording layer 9, incides in the photodetector 146, so generate regenerated signal RF, focus error signal FE and tracking error signal TE.
As mentioned above, if adopt this optical disc apparatus, then be inserted into the refractive index of the TN type liquid crystal 305 in many focuses parallel light tube lens 143 by change, change the focal length of many focuses parallel light tube lens, therefore with the focusing point of the laser beam of carrying out for mobile object lens 145 in the past object lens 145 are compared along the existing mechanical method that Z (optical axis) direction moves, can promptly carry out focus and shift, and can not cause fault.
In addition, a plurality of positions in double-layer CD 1 are measured interfloor distance in advance, should distance store with the position, distance and position according to this storage, determine that the best that is added on the TN type liquid crystal 305 applies voltage, even interfloor distance has discrete double-layer CD, also can correctly carry out focus and shift.
In above-mentioned example,, also can replace the parallel light tube lens and insert in the object lens though liquid crystal is inserted in the parallel light tube lens.In addition, the transparent component with the refractive index that can control can also be inserted in the lens, replace transparency electrode 303,304 and TN type liquid crystal 305, can get final product according to the focal length of the recording layer change lens that should regenerate in a word.
In addition, in above-mentioned example, utilize governor motion 47 that object lens 145 are moved along Z (optical axis) direction, carry out focus servo, but also can change continuously, carry out focus servo by making the voltage on the TN type liquid crystal 305 that is added in many focuses parallel light tube lens 143.
As mentioned above, if adopt example 4 of the present invention, then, shift so can promptly carry out focus owing to along with focal length is changed in the variation of the recording layer that should regenerate.
In addition, because liquid crystal is inserted in the parallel light tube lens, voltage along with the variation of the recording layer that should regenerate with regulation is added between the transparency electrode of liquid crystal both sides, shifts so can more promptly carry out focus than existing mechanical method, and is not easy to break down.
In addition, a plurality of position measurement interfloor distances in multiplayer optical disk, should distance store with the position, position and distance according to this storage, determine to be added in the assigned voltage between the transparency electrode of liquid crystal both sides, even, also can correctly carry out focus and shift so have at interfloor distance under the situation of discrete multiplayer optical disk.
[example 5]
In the existing again optical disc apparatus, if on the record surface of DVD, pin hole is arranged, then will be wrong etc. from the data of DVD regeneration, produce the indefinite situation of layer information of address, even carry out the focus transfer, can not transfer on the destination layer sometimes.In the case, can not know destination layer, will make a mistake.
Therefore, the fundamental purpose of example 5 of the present invention is to provide to be had on a kind of signal recording surface under the situation of hindering and can not judge layer, can utilize the different situations of each layer reflectivity to discern the video disc device of each layer.
Figure 49 is the block diagram of expression example 5 of the present invention.In Figure 49, the DVD dual layer discs 1 that single face reads is driven by spindle motor 16 and rotates, and is read the information of record on the dish 1 by adapter 60.Read signal RF, focus error signal FE and tracking error signal TE from the information of adapter 60 output signal record surfaces, these signals are amplified the back by prime amplifier 45 and supply with A/ D transducer 72,54,71, are transformed into digital signal, supply with DSP55.
Connecting ROM56 and RAM57 on the DSP55.ROM56 is used to store the program that control DSP55 uses, and RAM57 is used to store from coiling 1 information that obtains.DSP55 carries out program stored among the ROM56.According to canned data among the RAM57, according to signal for faster or reduce-speed sign, carry out adapter 60 is carried out the control that focus servo is used, make adapter 60 seek the control of usefulness simultaneously.DSP55 exports to D/A transformation component 58 with the digital signal that focus shifts control usefulness, and D/A transformation component 58 becomes simulating signal with this digital signal conversion, gives driver 59.Driver 59 is according to signal for faster and reduce-speed sign control adapter 60.
Figure 50 is the figure that explanation tracking signal TE uses.Adopt three light beam modes in this embodiment.The photodetector 43 of central authorities is photodetectors shown in Figure 2, and signal RF and focus error signal FE are read in its output.Be provided with photodetector 74 and 75 about magnetic track, this photodetector 43 is clipped in the middle, the poor e-f of photodetector 74 and 75 output signal becomes tracking error signal TE.
Figure 51 is the process flow diagram of the work usefulness of explanation the invention process form 5, and Figure 52 is the process flow diagram of the work usefulness when reading of data not is described equally.
At first, carry out coiling 1 initialization when reading according to the order of step shown in Figure 51.That is, after Fig. 4 and semiconductor laser 31 shown in Figure 5 were started working, drives spindle motor 16 drove focusing coil shown in Figure 9 702 again, carries out focus servo.Therefore, for example to focus on ground floor shown in Figure 2 be on the semitransparent type recording layer 5 to adapter 60.At this moment photodetector 74 shown in Figure 50 and 75 the poor e-f that detects signal are used as tracking error signal TE and give prime amplifier 45 and amplify, and are transformed into digital signal by A/D transducer 71 and supply with DSP55.DSP55 deposits the detected value of tracking error signal TE in region R AM1, begins simultaneously to follow the tracks of.
After beginning to follow the tracks of, from coiling 1 reading of data.The output signal RF that reads of these data is exported from photodetector 43, gives prime amplifier 45 and amplifies, and be transformed into digital signal by A/D transformation component 54.DSP55 deposits this detected value that reads output signal RF among the region R AM2 of RAM57 in.
Secondly, with focus be from ground floor semitransparent type recording layer 5 to transfer to the second layer be on the reflection-type recording layer 9 time, stop to follow the tracks of.Then, output, is transformed into digital signal by A/D transformation component 54 and gives DSP55 after prime amplifier 45 amplifications from the tracking error signal TE of photodetector 43.DSP55 exports to D/A transformation component 58 with tracking error signal TE, after this tracking error signal TE is transformed into simulating signal, drives focusing coil 702 by driver 59.Therefore, focus is transferred to the second layer is on the reflection-type recording layer 9 to adapter 60.At this moment, DSP55 deposits the detection level of tracking error signal TE among the region R AM3 of RAM57 in.After this, begin to follow the tracks of, detect from the level that reads output signal RF of adapter 60 outputs, detected value is at this moment deposited among the region R AM4 of RAM57.
Secondly, mistake etc. appears and under the situation about can not read, DSP55 can not judge the ground floor or the second layer in the data on the dish.At this moment enter the step shown in Figure 54, DSP55 detects the level from the tracking error signal TE of adapter 60.Then, DSP55 is with the ground floor stored among the region R AM1 of RAM57 and the RAM3 and the detected value addition of the tracking error signal on the second layer, level to the tracking error signal TE of 1/2 value of this additive value and detection compares, if the value that detects is little, just predicate ground floor, if the value that detects greatly, just predicates the second layer.
In the above description, though be that electrical level judging with tracking error signal is the ground floor second layer, but also can detect with the level of the regenerated signal RF of data.The flow process of this situation is shown in Figure 53.In the case, detected value addition with the regenerated signal RF that stores among the region R AM2 of RAM57 and the RAM4,1/2 the value of this additive value and the regenerated signal RF of detection are compared, if the value that detects is little, just predicate ground floor, if the value that detects greatly, just predicates the second layer.
Reflectivity to each signal in the ground floor and the second layer in the table 4 contrasts.In table 4, signal FE, the RE among the DVD of ground floor, the reflectivity of TE are 100% o'clock, and ground floor is different with the reflectivity of signal in the second layer, the reflectivity height of the second layer.The front illustrated with Figure 59, and this is because the semitransparent type recording layer 5 of ground floor has 30% reflectivity different therewith, and the reflection-type recording layer 9 of the second layer has due to 70% the reflectivity.
Table 4
| One deck DVD | Two-layer DVD ground floor | The two-layer DVD | |
| FE | |||
| 100％ | 36％ | 39 | |
| RF | |||
| 100％ | 33％ | 38％ | |
| TE (3 light beam) | 100％ | 33％ | 43％ |
| TE (DPD) | 100％ | 60％ | 86％ |
Therefore, shown in the flow process among Figure 51, if storage signal TE or RF are at the detected value of the ground floor and the second layer under original state, even then the data on the dish make a mistake and can not read, if the detected value of at this moment signal and the detected value of storage are compared, just can easily judge it is the ground floor or the second layer according to its reflectivity.
In addition, in above-mentioned example 5, though judged the ground floor and the second layer according to tracking error signal TE or regenerated signal RF, but it is as shown in table 4, because tracking error signal TE is different with the reflectivity on the second layer at ground floor, so also can discern the ground floor and the second layer with this tracking error signal.
As mentioned above, if adopt example 5 of the present invention, then since to any one signal in regenerated signal, focus error signal and the tracking error signal and in advance the storage ground floor and the detection signal of the second layer compare, discern the ground floor or the second layer, even it is so wrong and can not discern each layer time, also can easily discern on dish.
[example 6]
In existing dish device, the situation that pulse can take place when hindering can not obtain from the reflecting surface of dish is arranged on the panel surface, perhaps can not obtain pulse from reflecting surface owing to surface vibration or impact etc.Because the pulse that detects from dish by all photodetectors can obtain focus error signal FE, so after detecting peak value from the focus error signal FE of ground floor, under situation about not detecting from the peak value of the second layer, do not give governor motion with deceleration pulse, governor motion can produce the misoperation of impact disc.
Therefore, the fundamental purpose of example 6 of the present invention is to provide a kind of optical disc apparatus that can prevent the misoperation that focus shifts.
Figure 54 is the block diagram of expression example 6 of the present invention.In Figure 54, single face reads DVD-dual layer by spindle motor 16 driven in rotation, from signals such as adapter 60 output focus error signal FE, by giving A/D transformation component 54 after prime amplifier 45 amplifications, simulating signal is transformed into digital signal.This digital signal is fed to DSP55.
Connecting ROM56 and RAM57 on the DSP55.ROM56 is used to store the program that control DSP uses, and RAM57 is used to store from coiling 1 information that obtains.DSP55 carries out program stored among the ROM56, according to canned data among the RAM57, and according to signal for faster or reduce-speed sign, the control of specifying adapter 60 positions to use.DSP55 will control the digital signal of usefulness and export to D/A transformation component 58, and D/A transformation component 58 becomes simulating signal with this digital signal conversion, give driver 59.Driver 59 is according to signal for faster and reduce-speed sign control adapter 60.
Figure 55 is the process flow diagram of the work usefulness of explanation example 6 of the present invention, and Figure 56 A～56C is the figure of the work usefulness of explanation example 6 of the present invention.
In this example 6, will speed up after signal gives adapter 60, begin to carry out the control that focus shifts, pick up counting simultaneously, if passed through the regular hour, shift just carry out reverse focus.More particularly, shown in Figure 56 A, N-1 layer, N layer and N+1 layer are arranged, transfer to N layer on from the N-1 layer focus of adapter 60 after, again focus is transferred on the N+1 layer.
DSP55 shifts in order to carry out focus from N course N+1 layer, exports signal for faster in the time of the aa～bb of the focus error signal FE shown in Figure 56.After this signal for faster is transformed into simulating signal by D/A transformation component 58, amplify, drive focusing coil 702 shown in Figure 9 by driver 59.At this moment, DSP55 restarts after making the inner clock-reset of installing.This clock is made of hardware such as counters and gets final product, and perhaps also can use the software gate time.
DSP55 judges whether the count value of clock has surpassed predetermined value Tout.If do not surpass Tout, just the level of detection of focus error signal FE.Then, if the level of focus error signal FE is the zero cross point shown in the cc point among Figure 56 B, constipation bundle focus shifts., if clock has surpassed Tout,, prevent that adapter 60 from impacting cards as beginning to carry out reverse transition unusually.Here, carry out focus from N course N+1 layer and shift the needed time and for example be 2 milliseconds, then can in 5 milliseconds time of its several times, select Tout.
[example 7]
Figure 57 is the block diagram of expression example 7 of the present invention.In this example 7, exported the signal for faster that focus shifts usefulness after, when the light quantity level has surpassed predetermined value, just carry out reverse focus and shift.Therefore, shown in Figure 57, not only export focus error signal FE, and output light amount signal p, give DSP55 after in A/D transducer 72, being transformed into digital signal from prime amplifier 45.Structure in addition is identical with Figure 54.
Figure 58 is the process flow diagram of the work usefulness of explanation example 7 of the present invention.Secondly, with reference to Figure 58 of this example 7, the work of this example 7 is described.At first, identical with above-mentioned example 6, DSP55 will speed up signal and gives D/A transformation component 58, carries out the control that focus shifts.Signal for faster is transformed into simulating signal by D/A transformation component 58, gives the focusing coil 702 of adapter 60 after being amplified by driver 59.The reflected light that photodetector 43 detects from dish, prime amplifier 45 output light amount signal p and focus error signal FE.Each signal is given DSP55 after being transformed into digital signal by A/ D transducer 72 and 54 respectively.DSP55 measures light amount signal p, and it is compared with the light value Pout that is scheduled to shown in Figure 56 A～56C.If light amount signal p is littler than predetermined light value Pout, just detect the level of the focus error signal of N+1 layer.If this level is this zero cross point of cc point shown in Figure 56 B, constipation bundle focus shifts.
,, then predicate unusually, begin to carry out reverse transition, prevent adapter 60 impact discs if light amount signal p has surpassed light value Pout.
As mentioned above, if adopt example 7 of the present invention, then when on the signal recording surface of any one deck that focuses on CD, for on the signal recording surface that focuses on another layer and when having exported signal for faster, if when in official hour, not obtaining reflected light or not obtaining the reflected light of specified level, just give information readout device with reduce-speed sign, can prevent to impact CD.
Claims (1)
1. one kind makes information be recorded in the optical disc apparatus that the CD on the multilayer signal record surface is regenerated, and it is characterized in that having:
Light beam irradiates on described CD (1), is read the information readout device of described information (60) by detecting its reflected light;
Make described information readout device (60) move the drive unit (12,13) of usefulness along signal recording surface;
When described information readout device (60) focuses on arbitrary layer the signal recording surface in the described multilayer, produce focus transfer device (55) in order to the focus transfer signal on the signal recording surface that focuses on another layer;
Along with being supplied to, from the current address of described information readout device sense information and the information of layer, calculate the calculation element (55) of the amount of movement of described information readout device (60) as the address of target with as the information of the layer of target; And
Control device (55), it drives described drive unit, so that make described information readout device move the amount of movement that calculates by described calculation element, make described focus transfer device produce the focus transfer signal simultaneously, and supply with described information readout device, so that focus on the signal recording surface of destination layer.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8202525A JP2000200431A (en) | 1996-07-31 | 1996-07-31 | Focus jumping method |
| JP202525/96 | 1996-07-31 | ||
| JP256826/96 | 1996-09-27 | ||
| JP317559/96 | 1996-11-28 | ||
| JP336666/96 | 1996-12-17 | ||
| JP344011/96 | 1996-12-24 | ||
| JP345866/96 | 1996-12-25 | ||
| JP345630/96 | 1996-12-25 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971982988A Division CN1257496C (en) | 1996-07-31 | 1997-07-28 | Optical disc device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1700316A CN1700316A (en) | 2005-11-23 |
| CN1311444C true CN1311444C (en) | 2007-04-18 |
Family
ID=16458943
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100488365A Expired - Fee Related CN1331129C (en) | 1996-07-31 | 1997-07-28 | Optical disk device |
| CNB2004100488312A Expired - Fee Related CN1311443C (en) | 1996-07-31 | 1997-07-28 | Optical disk device |
| CNB2004100488327A Expired - Fee Related CN1311444C (en) | 1996-07-31 | 1997-07-28 | Optical disk device |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100488365A Expired - Fee Related CN1331129C (en) | 1996-07-31 | 1997-07-28 | Optical disk device |
| CNB2004100488312A Expired - Fee Related CN1311443C (en) | 1996-07-31 | 1997-07-28 | Optical disk device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2000200431A (en) |
| CN (3) | CN1331129C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001319344A (en) * | 2000-03-03 | 2001-11-16 | Sony Computer Entertainment Inc | Focus controller, recording medium and optical disk reproducing device |
| KR100382731B1 (en) * | 2000-12-20 | 2003-05-09 | 삼성전자주식회사 | Focus jumping method of multi-layer disc |
| US7936645B2 (en) | 2006-01-31 | 2011-05-03 | Panasonic Corporation | Optical disc device |
| JP2008287754A (en) * | 2007-05-15 | 2008-11-27 | Sony Corp | Optical information recording method, optical information reproduction method, optical information recording device and optical information reproduction device |
| KR101070675B1 (en) | 2009-11-12 | 2011-10-07 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Method for accessing a record layer of optical disc |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07254157A (en) * | 1994-03-14 | 1995-10-03 | Hitachi Ltd | Optical disk device |
| JPH08185633A (en) * | 1994-12-29 | 1996-07-16 | Sony Corp | Focus controller |
-
1996
- 1996-07-31 JP JP8202525A patent/JP2000200431A/en active Pending
-
1997
- 1997-07-28 CN CNB2004100488365A patent/CN1331129C/en not_active Expired - Fee Related
- 1997-07-28 CN CNB2004100488312A patent/CN1311443C/en not_active Expired - Fee Related
- 1997-07-28 CN CNB2004100488327A patent/CN1311444C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07254157A (en) * | 1994-03-14 | 1995-10-03 | Hitachi Ltd | Optical disk device |
| JPH08185633A (en) * | 1994-12-29 | 1996-07-16 | Sony Corp | Focus controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1331129C (en) | 2007-08-08 |
| CN1700315A (en) | 2005-11-23 |
| JP2000200431A (en) | 2000-07-18 |
| CN1700316A (en) | 2005-11-23 |
| CN1700317A (en) | 2005-11-23 |
| CN1311443C (en) | 2007-04-18 |
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