CN1155730A - Integrated optical pickup system capable of reading optical disks of different thicknesses - Google Patents

Integrated optical pickup system capable of reading optical disks of different thicknesses Download PDF

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Publication number
CN1155730A
CN1155730A CN 96120856 CN96120856A CN1155730A CN 1155730 A CN1155730 A CN 1155730A CN 96120856 CN96120856 CN 96120856 CN 96120856 A CN96120856 A CN 96120856A CN 1155730 A CN1155730 A CN 1155730A
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China
Prior art keywords
pickup system
optical pickup
light beam
integrated
integrated optical
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Pending
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CN 96120856
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Chinese (zh)
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崔良吾
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WiniaDaewoo Co Ltd
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Daewoo Electronics Co Ltd
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Priority to CN 96120856 priority Critical patent/CN1155730A/en
Publication of CN1155730A publication Critical patent/CN1155730A/en
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Abstract

An integrated optical pickup system for reading information signals recorded on a recording surface of a selected optical disk, is comprised of a first glass substrate equipped with means for generating a first and a second focused light beams, letting one of the focused light beams impinge onto the recording surface of the selected optical disk and collimating the focused light beam reflected from the selected optical disk, wherein each of the focused light beams is focused onto the recording surface of a corresponding optical disk, respectively; and a second glass substrate, integrated therein with a detector capable of measuring the intensity of a light beam detected and a reflection layer, thereby allowing the integrated optical pickup system to read the information signals off the recording surface of the selected optical disk.

Description

Can read the integrated optical pickup system of a plurality of CDs
The present invention relates to a kind of integrated optical pickup system; And, more specifically, relate to a kind of improved integrated optical pickup system that can read the CD of different-thickness.
As everyone knows, short wavelength light source and large-numerical aperture (NA) are the important optical considerations that is used to realize the optical pickup of HIGH-DENSITY OPTICAL STORAGE.Usually, the large-numerical aperture lens, for example 0.6, preferably be used to its thickness and for example be 0.6 millimeter glimmer dish; Thereby, if an optical head that is used to read the glimmer dish is used to read 1.2 millimeters traditional CDs, then may spherical aberration take place owing to the difference of disc thickness, this aberration must be revised.
Thereby the bifocus optical head that has holographic optical elements (HOE) (HOE) is introduced into head it off.Figure 1 illustrates is used to regenerate is stored in the bifocus optical head 100 of the information signal on a glimmer dish and the thick CD, these two dishes are contained on the pan arrest, wherein each CD has a corresponding record surface, this system is described in for example " the Dual FocusOptical Head for 0.6mm and 1.2mmDisks " of Kanda and Hayashi, SPIE the 2338th volume, Optical Data Storage (1994)/283.This bifocus optical head 100 comprises: one is used to produce the light source 126 of a light beam, one beam splitter 106, one collimation lens 108, one HOE 110, one object lens 112, one cylindrical lens 104 and one has the detecting device 102 of four photovoltaic elements, and wherein HOE110 is designed to concavees lens, these concavees lens+focal length of 1 order diffraction light beam 128 is greater than the focal length of 0 order diffraction light beam 124.
In this optical head 100, when a glimmer dish 116 is contained on the pan arrest, from 0 order diffraction light beam 124 of HOE 110 transmissions be used to regenerate information signal on the record surface 118 of glimmer dish 116.In this case, enter HOE110 from light source 126 emitted light beams of a for example laser diode through beam splitter 106 and collimation lens 108, this beam splitter 106 will be incident on and be installed on a lip-deep beam portion sub reflector wherein and its part is passed, and this collimation lens 108 is used to make the parallel beam from beam splitter 106.In this situation, for 0 order diffraction light beam 124 of parallel beam, the HOE110 role is a parallel-plate.This 0 order diffraction light beam 124 is focused on the record surface 118 of glimmer dish 116 by object lens 112.When 0 order diffraction light beam 124 from glimmer dish 116 when object lens 112 are reflected onto HOE110, the HOE110 role is again a parallel-plate.0 order diffraction light beam 124 passes cylindrical lens 104 and the astigmatism that becomes after passing collimation lens 108 and beam splitter 106, make detecting device 102 read information signal on the record surface 118 of glimmer dish 116.
Simultaneously, for the information signal on the record surface 120 of the thick CD 122 of regenerating, used from the HOE110 transmission+1 order diffraction light beam 128.Should be noted that, in the optical head 100+1 order diffraction light beam 128, remove beyond the HOE110, the function of optics and similar are in for 0 order diffraction light beam 124.In this case, HOE110 is lens together with object lens 112 roles, is used for+1 order diffraction light beam 128 is focused on the record surface 120 of thick CD 122.Therefore, the optical head 100 that is used for glimmer dish 116 information signal on the record surface 120 of thick CD 122 of can regenerating.
Yet, have many problems relevant with above-mentioned optical head 100.This optical head 100 of prior art requires a lot of heavy discrete parts, makes its assembling and calibration very complicated and expensive, needs a cylindrical lens 104 that is used for the detection of focus error signal again, makes this optical head 100 complicated more thus.
Therefore, fundamental purpose of the present invention provides an integrated optical pickup system that has reduced size, and its assembling and calibration are simpler.
According to the present invention, one integrated optical pickup system is provided, be used to read an information signal that is recorded on the record surface of a selected CD, should from N CD, select by selected CD, N is a positive integer, other all different of any one record surface in N CD and distance and all between this integrated optical pickup system wherein, this optic pick-up system comprises: one first photoconduction, be used to produce N convergent beam one of them directive should be selected the record surface of CD, and it is collimated after the reflection of the record surface of this selected CD at that bundle described in this convergent beam, wherein each in N convergent beam can be focused on the corresponding cd-rom recording surface respectively; With one second photoconduction, this photoconduction has the detecting device and that can measure the intensity of tested light beam to be used for this collimated light beam guiding and focuses on optical device on this detecting device, reads down the information signal on the record surface of this selected CD thus.
Above and other purpose of the present invention and advantage will be from below in conjunction with becoming apparent the accompanying drawing description of preferred embodiments, wherein:
Fig. 1 represents the schematic side view of the optic pick-up system of prior art;
Fig. 2 illustrates the diagrammatic cross-section according to an integrated optical pickup system of the present invention;
Fig. 3 illustrates the planimetric map according to an optical device of the present invention.
Figure 2 shows that an integrated optical pickup system 200, it comprises one first glass substrate 210 and one second glass substrate 212, each glass substrate has a upper surface and a lower surface, one is used to produce the semiconductor laser 220 of a light beam, one reflection collimation lens 240, one reflectance coating 280, one has the optical device 260 of a first 262 and a second portion 264, one detects the photodetector 290 that lens 250 and have a pair of receiving plane 292,294, the wherein upper surface of the lower surface of first glass substrate 210 and second glass substrate 212 coupling.Semiconductor laser 220 is attached to the lower surface of first glass substrate 210, and reflectance coating 280 is formed on the lower surface of first glass substrate 210 apart from 220 1 sections preset distance parts of semiconductor laser, and wherein reflectance coating 280 is made by the light reflecting material of for example Ag.Use the conditional electronic bundle writing system of a band curve pattern generator, reflection collimation lens 240 and optical device 260 are integrated on the upper surface of first glass substrate 210, relative with reflectance coating 280.
In this system 200, be mapped on the reflection collimation lens 240 by a light beam of semiconductor laser 220 emission, reflection collimation lens 240 and semiconductor laser 220 are relative to be that a parallel beam is to obtain a collimated light beam thus with this beam collimation also.This collimated light beam reflexes to optical device 260 by reflectance coating 280 that can the antireflection part collimated light beam, and what wherein this light beam was reflected is that part ofly being crossed optical device 260 with transmission after the reflection of one of record surface 272,276.
With reference to figure 3, show a planimetric map with optical device 260 of a first 262 and a second portion 264, this optical device 260 is integrated on first glass substrate 210.Each part of optical device 260 all has many gratings, wherein each grating all is an ellipse will become a light beam with the collimated beam that oblique angle θ is incident to optical device 260 thus, this light beam is assembled with an optical axis that is formed by the focus on first record surface of the central point of optical device 260 and glimmer dish 274, and wherein this optical axis is represented by a dotted line in Fig. 2.It is asymmetric that this ellipse is designed to its grating cycle, groove depth or raster shape, is converged to a light beam of assembling with optical axis with a collimated light beam that will have oblique angle θ.The optimal slot degree of depth of first 262 is different with grid cycle and second portion 264, thereby each of first 262 and second portion 264 all has different focal lengths.Therefore CD 270 and 274 is adjusted to such position: the collimated light beam that the second portion 264 of optical device 260 will be penetrated thereon focuses on second record surface 272 of thick CD 270, and the collimated light beam that the first 262 of optical device 260 will penetrate thereon focuses on first record surface 276 of glimmer dish 274.
When having first record surface 276 and thickness is when for example 0.6 millimeter glimmer dish 274 is installed on the pan arrest, the light that passes the first 262 of optical device 260 information signal on first record surface 276 of glimmer dish 274 that is used to regenerate, wherein optical device 260 is relative with first record surface 276 of glimmer dish 274.
Back with reference to figure 2, the collimated light beam that passes optical device 260 is divided into transmission respectively and crosses the first 262 of optical device 260 and first convergent beam and second convergent beam of second portion 264.In Fig. 2, this first and this second convergent beam represent by a solid line and a dotted line respectively.When first convergent beam is focused on first record surface 276 of glimmer dish 274, because the first 262 of optical device 260 is different with the focal length of second portion 264, so second convergent beam can not focus on this first record surface 276.Crossed the first 262 of optical device 260 to obtain one first collimated light beam thus from the first convergent beam transmission of first record surface, 276 reflections.This first collimated light beam is penetrated by reflectance coating 280 and is being detected on the lens 250.These detection lens 250 are integrated on the lower surface of second glass substrate 212, and are relative with photodetector 290 with reflectance coating 280.The effect that detects lens 250 is a cylindrical lens, utilizes an astigmatic method to be used for reading for example information signal of a focus error signal from first and second record surfaces 276,272 thus.Detect lens 250 with first collimated beam to the receiving plane 292,294 of photodetector 290, the second wherein tested convergent beam does not converge on the receiving plane 292,294 of photodetector 290 because first record surface 276 that reflects second convergent beam from the distance of first 262 less than its focal length.The receiving plane 292,294 of photodetector 290 can be measured the intensity of detected light beam.
In addition, for example be 1.2 millimeters thick CD 270 when being installed on the pan arrest when having second record surface 272 and thickness, utilize regenerate information signal on second record surface 272 of thick CD 270 of the light of the second portion 264 that passes optical device 260.The light beam that passes optical device 260 also is divided into transmission respectively and crosses the first 262 of optical device 260 and one first convergent beam and one second convergent beam of second portion 264.
In this case, second convergent beam is focused on second record surface 272 of thick CD 270, but because the first 262 of optical device 260 is different with the focal length of second portion 264, so first convergent beam can not focus on second record surface 272.Cross the second portion 264 of optical device 260 to obtain one second collimated light beam thus from the second convergent beam transmission of second record surface, 272 reflections.This second collimated light beam passes reflectance coating 280 and is mapped on the detection lens 250.Detect lens 250 with this second collimated beam on the receiving plane 292,294 of photodetector 290, wherein the first convergent beam out-focus that on the receiving plane 292,294 of photodetector 290, detects thereon because second record surface 272 that reflects first convergent beam from the distance of second portion 264 greater than its focal length.In the intensity distributions of the second detected convergent beam of photodetector 290 places in response to thick CD 270 apart from the displacement of optical device 260 and change.Photodetector 290 is through reflectance coatings 280 and detect the light distribution that lens 250 detect these second convergent beams, makes photodetector 290 read the information signal of a focus signal for example or a regeneration information signal from second record surface 272 of thick CD 270 thus.
Compare with prior art integrated optical pickup system 100, integrated optical pickup system 200 of the present invention can be used to read information signal selectively from glimmer dish and thick CD.Thereby this makes integrated optical pickup system 200 read this information signal by an integrated optical device 260 on first glass substrate 210 to reach.
Though the description of this invention is with reference to preferred embodiment, under the prerequisite that does not deviate from the spirit and scope of the present invention that following additional copy claim proposed, can make other modifications and variations.

Claims (18)

1, a kind of integrated optical pickup system that is used for the information signal of reading and recording on the record surface of a selected CD, should from N CD, select by selected CD, N is a positive integer, wherein the record surface and the distance between this integrated optical pickup system of each in N CD are different, and this optic pick-up system comprises:
One first optical devices, be used to produce N convergent beam one of them is incident upon the record surface of this selected CD, and it is collimated after the reflection of the record surface of this selected CD at that bundle described in this converging light, wherein each in N convergent beam can be focused on respectively on the record surface of a corresponding CD; With
One second optical devices, this device have the detecting device and that can measure the intensity of tested light beam to be used for this collimated light beam guiding and focus on optical device on this detecting device, read down the information signal on the record surface of this selected CD thus.
2, integrated optical pickup system as claimed in claim 1, wherein these first optical devices comprise:
The semiconductor laser instrument is used to produce a light beam;
One first optical coupler is used to collimate this light beam; And
One second optical coupler, be used for this collimated light beam is divided into N part, and each part in described N of this collimated light beam part is focused at N different focal position, wherein each focal position produces a described N convergent beam thus corresponding to the position of the record surface of each corresponding CD.
3, integrated optical pickup system as claimed in claim 2, wherein these first optical devices also comprise a reflectance coating, are used for partly reflexing to second optical coupler by the part of the light beam of first optical coupler collimation.
4, integrated optical pickup system as claimed in claim 3, wherein this second optical coupler in these first optical devices is sent it to this optical device second optical devices at this collimated light beam after record surface reflection.
5, integrated optical pickup system as claimed in claim 4, wherein this detecting device has one first and one second receiving plane.
6, integrated optical pickup system as claimed in claim 5, wherein each receiving surface can both be measured the intensity of tested light beam.
7, integrated optical pickup system as claimed in claim 6, wherein this detecting device is placed in the focus place of this optical device.
8, integrated optical pickup system as claimed in claim 3, wherein this collimated ray becomes an oblique angle of being scheduled to the optical axis that is formed by the mid point of second optical coupler and convergent point that should selected CD.
9, integrated optical pickup system as claimed in claim 1, wherein said several N are 2.
10, a kind of integrated optical pickup system that is used for the information signal of reading and recording on the record surface of a selected CD, should from N CD, select by selected CD, N is a positive integer, wherein the record surface and the distance between this integrated optical pickup system of each in N CD are different, and this optic pick-up system comprises:
One first glass substrate, have a upper surface and a lower surface, be equipped be used to produce N bar convergent beam with on the record surface that one of them is incident upon selected CD and after that bundle described in this convergent beam is reflected from the record surface of this selected CD with the device of its collimation, wherein the upper surface of this first glass substrate is relative with this CD;
One second glass substrate has a upper surface and a lower surface, is equipped with one and detects lens, and wherein these detection lens are integrated in the lower surface of this second glass substrate, and the coupling of the upper surface of the lower surface of this first glass substrate and this second glass substrate; And
One detecting device has one first and one second receiving plane, is used for reading down information signal from the record surface of selected CD.
11, as the integrated optical pickup system of claim 10, wherein this first glass substrate comprises:
The semiconductor laser instrument is used to produce a light beam, and wherein this semiconductor laser is attached to the pre-position on the lower surface of this first glass substrate;
One reflectance coating, a part that is used to reflect this light beam, wherein this reflectance coating is formed on the lower surface of this first glass substrate, apart from this semiconductor laser one preset distance;
One mirror lens is integrated on the upper surface of this first glass substrate, is used to collimate this light beam and it is directed at this reflectance coating; And
One optical device, being used for this collimated beam is N N convergent beam on the different focal positions, wherein the position of each focus is corresponding to the position of the record surface of each corresponding CD, and this optical device is integrated on the upper surface of first glass substrate, and is relative to produce convergent beam thus with the record surface of selected CD.
12, as the integrated optical pickup system of claim 11, it is relative with this reflectance coating with this detecting device respectively wherein should to detect lens.
13, as the integrated optical pickup system of claim 12, wherein said number N is 2.
14, as the integrated optical pickup system of claim 13, wherein this optical device has one first and one second portion, and wherein this first and second part is respectively ellipse and oval ring-like.
15, as the integrated optical pickup system of claim 14, wherein each part of this optical device has many gratings, will change the light beam that converges on the optical axis that the convergent point by the central point of this optical device and record surface that should selected CD forms thus with the collimated light beam that an oblique angle is propagated into.
16, as the integrated optical pickup system of claim 15, wherein the best grid groove depth of this first and grating cycle are different from second portion, so that each part all has different focal lengths.
17, as the integrated optical pickup system of claim 16, wherein this reflectance coating is made from silver.
18, as the integrated optical pickup system of claim 10, wherein this detecting device is placed in the focus place of these detection lens.
CN 96120856 1995-11-27 1996-11-27 Integrated optical pickup system capable of reading optical disks of different thicknesses Pending CN1155730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 96120856 CN1155730A (en) 1995-11-27 1996-11-27 Integrated optical pickup system capable of reading optical disks of different thicknesses

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR43819/95 1995-11-27
CN 96120856 CN1155730A (en) 1995-11-27 1996-11-27 Integrated optical pickup system capable of reading optical disks of different thicknesses

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CN1155730A true CN1155730A (en) 1997-07-30

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CN 96120856 Pending CN1155730A (en) 1995-11-27 1996-11-27 Integrated optical pickup system capable of reading optical disks of different thicknesses

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102043242B (en) * 2009-10-26 2012-07-11 致伸科技股份有限公司 Laser scanning reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102043242B (en) * 2009-10-26 2012-07-11 致伸科技股份有限公司 Laser scanning reader

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