CN1170932A - Optical pickup - Google Patents
Optical pickup Download PDFInfo
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- CN1170932A CN1170932A CN97114962A CN97114962A CN1170932A CN 1170932 A CN1170932 A CN 1170932A CN 97114962 A CN97114962 A CN 97114962A CN 97114962 A CN97114962 A CN 97114962A CN 1170932 A CN1170932 A CN 1170932A
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- light
- light source
- recording medium
- beam splitter
- photo
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/123—Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/139—Numerical aperture control means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1395—Beam splitters or combiners
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
An optical head capable of compatibly adopting disks of different formats includes a first optical source for emitting light having a predetermined wavelength, a second optical source for emitting light having a wavelength different from that of light emitted from the first optical source, an objective lens for focusing light emitted from the respective first and second optical sources on a recording medium placed in the optical player, a light path changing unit disposed on a light path between the first and second optical sources and the objective lens for changing the traveling path of incident light, a first optical detector for receiving light emitted from the first optical source and is incident via the recording medium and the light path changing unit, and a second optical detector for receiving light emitted from the second optical source and is incident via the recording medium and the light path changing unit.
Description
The present invention relates to a kind of optical head, relate in particular to a kind of optical head of disc-shaped recording medium that can compatible different-format.
But the optical head that is applicable to the digital video disk machine (DVDP) of high density recording and information reproduction should and reproduce at digital video disk (DVD) record, and can also be at the recording medium of CD class, for example a kind of mini disk (CD), CD-R (re-recordable), CD-I, record such as CD-G and reproduction are so that obtain compatibility.
Yet the standard thickness of existing C D class dish is 1.2mm, and owing to the reasons such as numerical aperture of admissible dish droop error, object lens, the standard thickness of DVD is 0.6mm.Therefore, when the optical head with DVD writes down and reproduces the information that is recorded on the CD, because the difference of its thickness will produce spherical aberration.Because this spherical aberration just can not obtain the enough light intensities that need recording information signal to use, the deterioration of signal perhaps can appear when reproducing.
Equally, the light source that reproduces DVD and CD has different wavelength, and wherein, the existing wavelength that reproduces the light source of CD is about 780nm, and the wavelength of reproduction DVD is about 650nm.
A kind of traditional compatible optical head, can record and reproduce the information have on the different-format dish as mentioned above, it comprises sends the light source that wavelength is about 650nm, is applicable to the DVD form, but has a kind of improved structure, this structure can compensate the thickness difference of used dish, makes the dish of different-format be used in interchangeably in the device with this compatible light head.In this case, send the optical head of the light source of 780nm wavelength light than employing, it is about 5% that its light intensity has descended, but but because it is in the allowed band of reproducing, so such problem is not serious.
Yet, during a kind of CD-R in adopting the CD class, use the light source that sends the 650nm wavelength light when the light source of 780nm wavelength light is sent in use, can produce the difference of sensitivity aspect.That is, be significant so follow the difference of the relevant reflectivity of wavelength, as shown in Figure 1, because CD-R has one deck organic dye film recording layer.So, using wavelength to be about the light time of 650nm, reflectivity drops in 10%, and this can not make signal reproduction.
In order to overcome above-mentioned problem, as shown in Figure 9, to have designed a kind of traditional compatible light and learned head, it comprises first light source 21 that sends the 650nm wavelength light and the secondary light source 31 that sends the 780nm wavelength light.First light source 21 is applicable to a kind of dish 10a of relative thin, and for example DVD coils, and secondary light source 31 is applicable to a kind of thick relatively dish 10b, for example the CD dish.
The light that is sent by first light source 21 is polarized beam splitter 23 reflections, by interference light filter 33, λ/4 optical path difference sheets 11 and holographic element 13, is focused on the CD 10 by object lens 15 again.The light that interference light filter 33 sends secondary light source 31 reflexes to CD 10, again by the light by CD 10 reflections.
Because its diameter of light that first light source 21 sends is greater than the diameter that is formed on holographic element 13 supercentral diffraction patterns, so this light is not subjected to diffraction, in addition at light by also diffraction not after the holographic element 13, promptly, be zero order diffracted light, it is focused on the CD 10a of relative thin.In addition, the light that is sent by secondary light source 31 is subjected to the diffraction of diffraction pattern by holographic element 13 time, become+1 grade of light, and focus on the thick relatively CD 10b.
Compatible optical head can use CD-R as recording medium when adopting two kinds of light sources.Yet the use that forms the holographic element of diffraction pattern on it will make assembling and optical arrangement have any problem.And owing to use optical detector, just the optical axis of the light that need send two light sources is adjusted accurately.
The objective of the invention is to, provide a kind of and can be compatible with the compatible light head different-format CD, simple in structure, to overcome above-mentioned problem.
For achieving the above object, the compatible light that is provided is learned head and comprised: one sends first light source of certain wavelength light; One secondary light source, its light wavelength of sending is different from first light wavelength that light source sends; One light that first and second light sources are sent focuses to the object lens on the recording medium respectively; One is arranged on the optical path switching device between first, second light source and the object lens, is used to change the travel path of incident light; One first photo-detector, be used to receive send from first light source and via the light of recording medium and optical path switching device incident; One second photo-detector, be used to receive send from secondary light source and via the light of recording medium and optical path switching device incident.
Optical path switching device comprises: first beam splitter on light path between first light source and the object lens, be used for the light that first light source sends is reflexed to recording medium, and will lead to first photo-detector by the light of recording medium reflection again; One second beam splitter on light path between first beam splitter and the object lens is used for the light that secondary light source sends is reflexed to recording medium, and by the light by described recording medium reflection; One the 3rd beam splitter on light path between first and second beam splitters, be used for secondary light source send, by recording medium reflection and the light reflection by second beam splitter to second photo-detector.
According to a further aspect in the invention, optical path switching device comprises: first beam splitter on light path between first light source and the object lens is used for the light that first light source sends is reflexed to recording medium, and will be led to first photo-detector by the light of recording medium reflection; One second beam splitter on light path between first beam splitter and the object lens is used for the light that secondary light source sends is reflexed to recording medium, and by the light by recording medium reflection; One the 3rd beam splitter on light path between the object lens and second beam splitter, be used for the light that first and second light sources send is passed to recording medium, and transmission send from first light source, again by the light of recording medium reflection, and will send by light source, reflex to second photo-detector by the light of recording medium reflection.
In accordance with a further aspect of the present invention, optical path switching device comprises: one is positioned at first beam splitter on the light path between first light source and object lens, and the light that is used for being sent by first light source passes to recording medium, and the light of recording medium reflection is reflexed to first photo-detector; One is positioned at second beam splitter on the light path between secondary light source and object lens, is used to reflect the light that secondary light source sends, and with light directive second photo-detector of recording medium reflection; One is positioned at the 3rd beam splitter on the light path between first beam splitter and object lens, be used for send from secondary light source, reflex to recording medium by the light of second beam splitter reflection, and will reflex to second beam splitter by the light of recording medium reflection.
In accordance with a further aspect of the present invention, first light source and the mutual positioned adjacent of first photo-detector constitute one first assembly.
Above-mentioned purpose of the present invention and advantage will be clearer by describing the preferred embodiments of the present invention in detail referring to accompanying drawing, wherein:
Fig. 1 is the curve map of optical source wavelength and reflectivity when adopting CD-R as recording medium;
Fig. 2 is the optical arrangement synoptic diagram that traditional compatible light is learned head;
Fig. 3 is an optical arrangement synoptic diagram of learning head according to the compatible light of first embodiment of the invention;
Fig. 4 is an optical arrangement synoptic diagram of learning head according to the compatible light of second embodiment of the invention;
Fig. 5 is an optical arrangement synoptic diagram of learning head according to the compatible light of third embodiment of the invention;
Fig. 6 is an optical arrangement synoptic diagram of learning head according to the compatible light of fourth embodiment of the invention;
Fig. 7 is the schematic sectional view of the embodiment of first assembly employed in figure 6.
As shown in Figure 3, the compatible light of first embodiment of the invention head comprises: first and second light sources 51 and 61 that produce and send laser; First, second and the 3rd beam splitter 53,63 and 65, they are arranged on the light path as optical path switching device, to change the travel path of incident light; One object lens 41 are used for the light that light source 51 and 61 sends is focused to recording medium 10; And first and second photo- detectors 57 and 69, be used to receive light by recording medium 10 reflections, and detection information signal and error signal.
First and second light sources 51 and 61 are arranged on the different light paths, drive wherein a kind of light source selectively according to the kind of recording medium.Here, first and second light sources 51 and 61 driving mechanism are to adopt a kind of manual method of operating, promptly, the user selects to be suitable for the light source of certain recording medium 10, or a kind of automatic method of operating, that is, select light source by the detectable independent detector (not shown) that is contained in the kind of the recording medium 10 in the player.Because above-mentioned driving mechanism is known, so omit the detailed description to them.
The light that 41 pairs first and second light sources 51 of object lens and 61 send focuses on, and forms a luminous point on recording medium 10.Object lens 41 are driven by the actuator (not shown) that drives according to focus error signal and tracking error signal.
First and second photo- detectors 57 and 69 receive by first light source 51 respectively and secondary light source 61 sends and via the light of recording medium 10, first, second and the 3rd beam splitter 53,63 and 65 incidents.First and second photo- detectors 57 and 69 comprise two light receiving plates (not shown) at least, are used to receive incident light, and produce the electric signal corresponding to this light quantity.Carry out differential and/or summation amplification from the electric signal of first and second photo- detectors 57 and 69 outputs, be used for detection information signal, tracking error signal and focus error signal.
In addition, the 3rd beam splitter 65 and change to be propagated light path on the light path between first and second beam splitters 53 and 63, make first light source 61 that send, by second beam splitter 63 and by light directive second photo-detector 69 of recording medium 10 reflections.But each in first, second and the 3rd beam splitter 53,63 and 65 is coating all, make light in certain wavelength region may can be selectively by or reflection.
The second and the 3rd beam splitter 63 and 65 can be the plane or cubical.At the second and the 3rd beam splitter 63 and 65 is under the situation on plane, the astigmatism that causes owing to the inclination of two beam splitters 63 and 65, the light that sends at first light source 51 by the time should not occur, so, as shown in the figure, the second and the 3rd beam splitter 63 and 65 tilts in opposite direction, with the astigmatism between offsetting mutually.Best, the pitch angle between the second and the 3rd beam splitter 63 and 65 is 90 °.
On the light path between the object lens 41 and second beam splitter 63, also be provided with collimation lens 45.Because first light source 51 is positioned on the focus of collimation lens 45, so light that send from first light source, by collimation lens 45 becomes directional light.In addition,, that is, be positioned at, become the light that almost is similar to directional light so light A 61 that send from secondary light source, by collimation lens 45 disperses than on the short position of focal length because secondary light source is positioned at the focal position of departing from collimation lens 45.As mentioned above, 61 that send by secondary light source, can stop the generation spherical aberration through the dispersing of light of collimation lens 45, this is because when manufacturing is used for the object lens 41 of relative thin CD 10a, between the wavelength of light source and the recording medium 10 a kind of thickness difference caused.
Light that send by first light source 51 and by collimation lens 45 and object lens 41 focus on the recording medium 10a of relative thin.Light that send by secondary light source 61 and by collimation lens 45 and object lens 41 focus on the relative thick recording medium 10b.
In addition, on the light path between first beam splitter 53 and first photo-detector 57, also be provided with first sensor lens 55, the focusing of inciding the light on first photo-detector 57 is controlled.First sensor transmission 55 helps the optical arrangement of first photo-detector 57.In addition, the curvature of may command first sensor lens 55 makes the horizontal direction focal position of the light by first sensor lens 55 be different from the position of its vertical direction focus, and this just causes astigmatism.So first photo-detector 57 can be surveyed focus error signal by Astigmatism methord.
On the light path between the 3rd beam splitter 65 and second photo-detector 69, also be provided with one second sensor leads 67.The structure of second sensor leads 67 and effect be identical with first sensor lens 55 basically.
The described a kind of compatible optical head of second embodiment of the invention is illustrated among Fig. 4.Among the figure, represent components identical with label identical among Fig. 3.Referring to Fig. 4, one second beam splitter 163 is arranged on the light path between first beam splitter 53 and the object lens 41, and will reflex to recording medium 10 from the light that secondary light source 61 sends, again by the incident light from recording medium reflection.
One the 3rd beam splitter 165 on the light path between the object lens 41 and second beam splitter 163, and by from the incident light of first and second light sources 51 and 61, will be 61 that send, by light directive second photo-detector 69 of recording medium 10 reflections by secondary light source.
Here, the best second and the 3rd beam splitter 163 and 165 is as shown in Figure 4 cube shaped, and it can make the shape of the light that sends from secondary light source 61 can be owing to astigmatism is out of shape.
A kind of compatible optical head according to third embodiment of the invention, as shown in Figure 5.Among the figure, identical label is represented components identical.According to the feature of present embodiment, the 3rd beam splitter 65 and reflexes to recording medium 10 with the light that secondary light source 61 sends on the light path between first beam splitter 53 and the object lens 41, and reflection is from the incident light of recording medium 10 reflections.
Second beam splitter 63 and will be from light directive second photo-detector 69 of the 3rd beam splitter incident on the light path between secondary light source 61 and the 3rd beam splitter 65.
Preferably, first, second and the 3rd beam splitter 53,63 and 65 are shown in Figure 5 pancake.Among the figure, first beam splitter 53 and the 3rd beam splitter 65 relative tilts.Also have, first light source 51 and first beam splitter 53, the 3rd beam splitter 65, object lens 41 and recording medium 10 are point-blank.
First, second and the 3rd beam splitter 53,63 and 65 can be cubical or aforesaid flat.
See Fig. 6, a kind of compatible optical head of fourth embodiment of the invention, it comprises first and second optical modules 70 and 80, is used to launch the light of different wave length, and receives the light by recording medium 10 reflections simultaneously; Object lens 41 focus on first and second optical modules 70 and 80 light that send on the record surface of recording medium 10; One optical path switching device, for example a beam splitter 47 is arranged on the light path, to change the travel path of incident light.Represent components identical with label identical among the former figure.
According to the feature of present embodiment, light source and photo-detector are combined into an optical module.In this case, just need in light path, not insert first beam splitter, 53 (see figure 3)s and the 3rd beam splitter 65.So owing to have only a beam splitter 47 as optical path switching device, so can make simplifying the structure of optical system, the utilization factor of light is improved.
Can form by light source shown in Fig. 3 to 5 and photo-detector for one in first and second optical modules 70 and 80.
First optical module 70 can adopt when beam splitter 47 has the cubic type structure, and its formation as shown in Figure 7.In Fig. 7, first optical module 70 comprises, a substrate 71, settle first light source 151 and first photo-detector 157 on it, shell 72 covers first light source 151 and first photo-detector 157, also has an emitter window 73 on shell, settles a holographic element 74 in emitter window 73.
When first light source 151 was an edge emitting laser, first light source 151 was connected to substrate 71 by fabricated section 75.In addition, first optical module 70 comprises and a plurality ofly runs through and be fixed to lead-in wire 76 on the substrate 71, is used to drive first light source 151 and first photo-detector 157.
The structure of second optical module 80 of Fig. 6 is analogous to the structure of first optical module 70, difference is that the light of secondary light source (not shown) and the emission of second photo-detector and the light wavelength of detection are different from the light wavelength of first light source 151 and first photo-detector.
When the shape of beam splitter 47 is made inclination dull and stereotyped, be arranged on the light path first and second optical modules 70 and 80 holographic element 74 bevels, its vergence direction is opposite with the vergence direction of beam splitter 47.So the optical distortion that incides on the recording medium 10 from first light source 51 can obtain stoping.
A kind of according to compatible optical head of the present invention, comprise first and second light sources of launching different wavelengths of light, use the CD of different-thickness with kind by selecting a kind of light source of driving according to recording medium used therefor compatiblely, and can prevent to being recorded on the CD class dish destruction of data when especially coiling the information regeneration on the CD-R dish with organic dye film recording layer.In addition, use two light sources can improve the serviceable life of optical head selectively, use two photo-detectors also to be convenient to the light path arrangement of each building block.
Claims (17)
1. compatible optical head, it comprises:
One emission has first light source of predetermined wavelength;
One emission wavelength is different from the secondary light source that described first light source sends optical wavelength;
One object lens, the light that is used for respectively described first and second light sources being sent focuses on recording medium;
One optical path switching device, on the light path between described first and second light sources, described object lens are used to change the travel path of incident light;
One first photo-detector, be used to receive send by described first light source and via the light of described recording medium and described optical path switching device incident;
One second photo-detector, be used to receive send by described secondary light source and via the light of described recording medium and described optical path switching device incident.
2. compatible optical head as claimed in claim 1, wherein, described optical path switching device comprises:
One first beam splitter on light path between described first light source and the described object lens, the light that is used for being sent by described first light source reflexes to described recording medium, and will be by described first photo-detector of the light directive of described recording medium reflection;
One second beam splitter on light path between described first beam splitter and the described object lens, the light that is used for being sent by described secondary light source reflexes to described recording medium, and transmits the light by described recording medium reflection;
One the 3rd beam splitter on light path between described first and second beam splitters, be used for send from described secondary light source, by recording medium reflection and the light reflection by described second beam splitter to described second photo-detector.
3. compatible optical head as claimed in claim 2 also comprises, collimation lens, be used for be incident between described first and second light sources and described object lens on diverging light become directional light or approximately parallel light.
4. compatible optical head as claimed in claim 3, wherein, described secondary light source is positioned at the focal length of described collimation lens, make by described secondary light source send and light by described collimation lens with certain angular dispersed.
5. compatible optical head as claimed in claim 2 also comprises, first sensor lens are used to regulate the focusing of the incident light on the light path that incides at least one described first and second photo-detector.
6. compatible optical head as claimed in claim 1, wherein, described optical path switching device comprises:
One first beam splitter on light path between described first light source and the described object lens, the light that is used for being sent by described first light source reflexes to described recording medium, and will be by described first photo-detector of the light directive of described recording medium reflection;
One second beam splitter on light path between described first beam splitter and the described object lens, the light that is used for being sent by described secondary light source reflexes to described recording medium, and will be by the light by described recording medium reflection;
One second beam splitter on light path between described object lens and described second beam splitter, be used for and be mapped to described recording medium by the light that described first and second light sources send, and by send by described first light source and by the light of described recording medium reflection, and will send by described light source and reflex to described second photo-detector by the light of described recording medium reflection.
7. compatible optical head as claimed in claim 6 also comprises: collimation lens are used for and will are incident between described first and second light sources on the light path and the diverging light on the object lens becomes to directional light or is similar to parallel light.
8. compatible optical head as claimed in claim 7, wherein, described secondary light source is positioned at the focal length of described collimation lens, makes by described secondary light source to send, also pass through the light of collimation lens with certain angular dispersed.
9. compatible optical head as claimed in claim 6 also comprises, first sensor lens are used for regulating the focusing of the light on one that incides described at least first and second photo-detectors.
10. compatible optical head as claimed in claim 1, wherein, described optical path switching device comprises:
One first beam splitter on light path between described first light source and the described object lens is used for the described recording medium of light directive that will be sent by described first light source, and will be reflexed to described first photo-detector by the light of described recording medium reflection;
One is positioned at second beam splitter on the light path between described secondary light source and described object lens, is used to reflect the light that sends from described secondary light source, and will be by described second photo-detector of the light directive of described recording medium reflection; With
One the 3rd beam splitter on light path between described first beam splitter and the described object lens, be used for sending by described secondary light source, reflex to described recording medium by the light of described second beam splitter reflection, and the light of described recording medium reflection is reflexed to described second beam splitter.
11. the compatible optical head as claim 10 also comprises, collimation lens are used for the light path and the diverging light on the described object lens that incide between described first and second light sources are changed into directional light or approximately parallel light.
12. as the compatible optical head of claim 11, wherein, described secondary light source is positioned at the focal length of described collimation lens, makes light that send from secondary light source, by described collimation lens with certain angular dispersed.
13. the compatible optical head as claim 10 also comprises, first sensor lens are used for regulating the focusing of the light on one the light path that is incident on described at least first and second photo-detectors.
14. compatible optical head as claimed in claim 1, wherein, described first light source and described first photo-detector are installed toward each other, constitute one first assembly.
15. as the compatible optical head of claim 14, wherein, described first assembly comprises:
One substrate, described first light source and described first photo-detector are installed on the described substrate;
One shell has the emitter window by the light that sends from described first light source, and first light source and described first photo-detector are stated in described casing cover residence;
One holographic element is placed in the described emitter window, is used for light that send from described first light source and described object lens of process and the reception of described recording medium is directed to described first photo-detector.
16. compatible optical head as claimed in claim 1, wherein, described secondary light source and the arrangement adjacent to each other of second photo-detector constitute one second assembly.
17. as the compatible optical head of claim 16, wherein, described second assembly comprises:
One substrate is installed described secondary light source and described second detector on this substrate;
One shell has the emitter window by the light that sends from described secondary light source, and secondary light source and described second photo-detector are stated in this casing cover residence;
One holographic element is placed in the described emitter window, and the light that will be sent by described secondary light source and receive via described object lens and recording medium is directed to described secondary light source.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20725/96 | 1996-06-07 | ||
| KR1019960020725A KR100234261B1 (en) | 1996-06-07 | 1996-06-07 | Compatible optical pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1170932A true CN1170932A (en) | 1998-01-21 |
| CN1093975C CN1093975C (en) | 2002-11-06 |
Family
ID=19461391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97114962A Expired - Fee Related CN1093975C (en) | 1996-06-07 | 1997-06-07 | Optical pickup |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2818408B2 (en) |
| KR (1) | KR100234261B1 (en) |
| CN (1) | CN1093975C (en) |
| NL (1) | NL1006255C2 (en) |
| SG (1) | SG52983A1 (en) |
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| WO2020233665A1 (en) * | 2019-05-21 | 2020-11-26 | 上海必修福企业管理有限公司 | Optical system and optical method |
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| KR20000009844A (en) * | 1998-07-29 | 2000-02-15 | 사까이 히로시 | Optical pickup |
| KR100315637B1 (en) | 1999-03-31 | 2001-12-12 | 윤종용 | Optical system of DVD-ROM capable of play/record CD-RW |
| KR20030075753A (en) * | 2002-03-20 | 2003-09-26 | 삼성전자주식회사 | Compatible optical pickup |
| KR100565797B1 (en) | 2004-09-20 | 2006-03-29 | 삼성전자주식회사 | Optical pick-up apparatus for multi recoding/reproducing |
| JP2006236513A (en) * | 2005-02-28 | 2006-09-07 | Hitachi Media Electoronics Co Ltd | Optical pickup |
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| US5513164A (en) * | 1992-09-11 | 1996-04-30 | Kabushiki Kaisha Toshiba | Optical recording and reproducing apparatus |
| JP3309470B2 (en) * | 1993-03-10 | 2002-07-29 | 松下電器産業株式会社 | Optical information recording / reproducing device |
| KR0171078B1 (en) * | 1994-05-13 | 1999-04-15 | 배순훈 | A recording and reproducing optical pickup system for the optical disk with plural recording layer in one side by generating successively different wavelength laser beam |
| JPH07311945A (en) * | 1994-05-17 | 1995-11-28 | Matsushita Electric Ind Co Ltd | Optical recorder/player |
| JP3240846B2 (en) * | 1994-08-12 | 2001-12-25 | 松下電器産業株式会社 | Light head |
| DE69635559T2 (en) * | 1995-06-05 | 2006-06-14 | Nec Corp | Optical playback head device for various types of discs |
-
1996
- 1996-06-07 KR KR1019960020725A patent/KR100234261B1/en not_active IP Right Cessation
-
1997
- 1997-06-02 SG SG1997001868A patent/SG52983A1/en unknown
- 1997-06-06 NL NL1006255A patent/NL1006255C2/en not_active IP Right Cessation
- 1997-06-07 CN CN97114962A patent/CN1093975C/en not_active Expired - Fee Related
- 1997-06-09 JP JP9151390A patent/JP2818408B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031016B (en) * | 2006-03-03 | 2011-06-22 | 富士施乐株式会社 | Image reading apparatus |
| CN102396214A (en) * | 2009-04-13 | 2012-03-28 | 日本电气工程株式会社 | Image reading device |
| CN102396214B (en) * | 2009-04-13 | 2015-04-29 | 日本电气工程株式会社 | Image reading device |
| US9294651B2 (en) | 2009-04-13 | 2016-03-22 | Nec Engineering, Ltd. | Image reading device for reading document images with visible light and non-visible light being switchingly applied |
| WO2020233665A1 (en) * | 2019-05-21 | 2020-11-26 | 上海必修福企业管理有限公司 | Optical system and optical method |
| CN113939872A (en) * | 2019-05-21 | 2022-01-14 | 上海必修福企业管理有限公司 | Optical system and optical method |
| CN113939872B (en) * | 2019-05-21 | 2024-01-30 | 上海必修福企业管理有限公司 | Optical system and optical method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1079138A (en) | 1998-03-24 |
| JP2818408B2 (en) | 1998-10-30 |
| KR100234261B1 (en) | 1999-12-15 |
| CN1093975C (en) | 2002-11-06 |
| NL1006255C2 (en) | 2000-01-10 |
| NL1006255A1 (en) | 1997-12-10 |
| SG52983A1 (en) | 1998-09-28 |
| KR980004512A (en) | 1998-03-30 |
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