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1. 发明专利

JP2001143307A OPTICAL PICKUP 失效
公开(公告)号：JP2001143307A
公开(公告)日：2001-05-25
申请号：JP32798699
申请日：1999-11-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI , MORI TAIICHI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a small-sized and thin type optical integrated element capable of recording/reproducing to/from optical disks having different recording densitys. SOLUTION: In the optical pickup reproducing information from recording media, a package unit 1 storing plural light sources 2, 3 transmitting respective light for reading information having different recording density from the optical recording media and plural light receiving elements 4, 6 for receiving reflected light from respective optical recording media, an exiting optical means exiting respective light from the plural light sources 2, 3 to the optical recording media as the same optical axis, and an incident optical means making reflected light from respective recording media having the different recording density incident on respective corresponding plural light receiving elements are provided. The exiting optical means and the incident optical means are disposed on the package unit 1 in a laminated state.

2. 发明专利

JPH10177735A OPTICAL PICKUP 失效
公开(公告)号：JPH10177735A
公开(公告)日：1998-06-30
申请号：JP33535796
申请日：1996-12-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HARUGUCHI TAKASHI , KOJIMA KOKI , KONO HARUHIKO
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup easy to thin by removing the impedimental main cause of the thinning of the optical pickup. SOLUTION: This optical pickup is provided with a light source emitting light, a photodetector light receiving reflection light from an optical recording medium, a reflection means 2 reflecting the emitted light from the light source so as to become nearly vertical to the recording surface of the optical recording medium and an objective lens 3 focusing the emitted light through the reflection means 2 on the recording surface of the optical recording medium, and is constituted so as to make the light source and the photodetector come close to the optical recording medium than the reflection means 2.

3. 发明专利

JPH10154344A OPTICAL PICKUP 失效
公开(公告)号：JPH10154344A
公开(公告)日：1998-06-09
申请号：JP31034896
申请日：1996-11-21
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI , HARUGUCHI TAKASHI , NAKAJIMA KAZUYUKI , FURUKAWA FUMINOBU
IPC分类号： G11B7/09 , G11B7/00 , G11B7/123 , G11B7/125 , G11B7/1275 , G11B7/135 , G11B7/1353 , G11B7/1362 , G11B7/1365 , G11B7/1374 , G11B7/139
摘要： PROBLEM TO BE SOLVED: To provide the optical pickup which records and reproduces optical disks having different recording densities, is small in its size, thin in its thickness and low in the power consumption. SOLUTION: The pickup has an objective lens 16, a first optical unit 4 which has light emitting and receiving elements used to record and to reproduce a high density optical disk 17, a second optical unit 8 which has light emitting and receiving elements used to record and to reproduce a low density optical disk, a beam splitter 10 which guides the optical axes of the units 4 and 8 to a same optical axis and a wavelength filter 15 which changes the diameter of the luminous flux made incident on the lens 16 while conducting recordings and reproducings of the disk 17 and the low density optical disk. Thus, recording and reproducing of the high and low density optical disks are easily performed.

4. 发明专利

JPH08338936A OPTICAL HEAD DEVICE 失效
公开(公告)号：JPH08338936A
公开(公告)日：1996-12-24
申请号：JP14600495
申请日：1995-06-13
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KIYOMATSU SATOSHI , KOJIMA KOKI
IPC分类号： G02B7/04 , G11B7/09 , G11B7/135
摘要： PURPOSE: To provide an optical head device stable and fast in operation performance and capable of being made compact and light in weight. CONSTITUTION: An objective lens 29 is freely moved in the focusing direction thereof and the movement thereof within a surface including a tracking direction and being parallel with a disk surface is restricted by a wire 33 inserted in a through-hole which is coaxial with an optical axis and whose diameter is very small. Therefore, the lens 29 is not deflected or inclined. Besides, a focusing control action or a tracking control action can be executed without widening the thickness of the optical head device.

5. 发明专利

JPH08286014A OBJECTIVE LENS OF OPTICAL PICKUP 失效
公开(公告)号：JPH08286014A
公开(公告)日：1996-11-01
申请号：JP8931495
申请日：1995-04-14
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KIYOMATSU SATOSHI , KOJIMA KOKI
IPC分类号： G02B5/18 , G02B3/08 , G02B5/32
摘要： PURPOSE: To provide the objective lens of an optical pickup performing optical signal output where light condensing performance is high and which is stable by correcting astigmatic component incoporated in outgoing light from a semiconductor laser. CONSTITUTION: An astigmatic correcting means 19 correcting the astigmatic component which the objective lens 13 has is provided at the incident surface 18 of the objective lens 13 from the semiconductor laser 11. The astigmatic correcting means 19 is constituted of a nearly cylindrical surface that has a bus in the minor axis direction N of the incident ellipitic luminous flux 20 of the semiconductor laser 11. Also, it is realized by a hologram and a distribution refractive index plate.

6. 发明专利

JPH04291034A OPTICAL PICKUP 失效
公开(公告)号：JPH04291034A
公开(公告)日：1992-10-15
申请号：JP5664991
申请日：1991-03-20
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI
IPC分类号： G02B5/32 , G02B7/18 , G02B7/182 , G11B7/135
摘要： PURPOSE:To reduce the size and weight of an image forming system and to make it compact by using the image forming system of an optical disk as a limited optical system and using an optical element having a negative power reflection surface as a light polarization element. CONSTITUTION:Laser light emitting from a semiconductor laser 1 is polarized by a convex mirror 2a, made incident on an objective lens 3, passes through the objective lens 3 and collected on an optical disk 4. At this time, the reflection light by the convex mirror 2a expands than the reflection light as in the case of using a flat mirror depending on the curvature of the convex mirror 2a. Accordingly, even when the respective distance among a light source 1, light polarization element 2a and an objective lens 3 is reduced, the size of the beam diameter of the light incident on the objective lens 3 can be set to a desired opening and so the small-sized, light-weighted and compact optical pickup for the optical system can be obtained.

7. 发明专利

JPH1049904A OPTICAL PICKUP 失效
公开(公告)号：JPH1049904A
公开(公告)日：1998-02-20
申请号：JP19871496
申请日：1996-07-29
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a compact optical pickup capable of dealing with different kinds of optical disks and securing sufficient signal intensity. SOLUTION: This optical pickup device includes two semiconductor lasers 1 and 2 for emitting identical or different wavelength laser light, a photodetector 8 composed of a plurality of light receiving elements, a heat sink 9 having two semiconductor lasers 1 and 2 and the photodetector 8, a housing having a laser light transmitting window while sealing the heat sink 9, two polarized beam splitters 3 and 4, a reflection mirror 5, a 1/4 wavelength plate 6 and a grating 7. The light separating surfaces of the two polarized beam splitters 3 and 4 and the reflection surface of the reflection mirror 5 are placed in parallel to each other, the housing 2, the polarized beam splitters 3 and 3, the reflection mirror 5, the 1/4 wavelength plate 6 and the grating 7 are integrally provided and thus, difference kinds of optical disk are dealt with and sufficient signal intensity is secured by a compact form.

8. 发明专利

JPH05101434A OPTICAL PICKUP 失效
公开(公告)号：JPH05101434A
公开(公告)日：1993-04-23
申请号：JP25625391
申请日：1991-10-03
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI , HORINOUCHI SHOGO , KIYOMATSU SATOSHI
IPC分类号： G11B7/135
摘要： PURPOSE:To miniaturize the optical pickup to be used for an optical information recorder. CONSTITUTION:The exit light from a semiconductor laser 1 which generates a laser beam moves back and forth within a diffraction optical element 8 consisting of a reflection type diffraction element 5 as a 1st reflection surface, a reflection type diffraction element 4 as a 2nd reflection surface, a diffraction element 5 as a condensing optical element and a diffraction element 2 which introduces the laser beam to a multidivision photodetector 6. The reflected light reflected on a disk moves back and forth again in this element. The prescribed optical path length is attained by the small-sized constitution in this way.

9. 发明专利

JPH10222862A OPTICAL PICKUP 失效
公开(公告)号：JPH10222862A
公开(公告)日：1998-08-21
申请号：JP2019097
申请日：1997-02-03
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI , HARUGUCHI TAKASHI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pick up capable of recording and reproducing optical disks different in recording density, small in size, thin in thickness and reduced in the power consumption by providing two optical units and one optical system and sharing the system among the units. SOLUTION: Optical units 4 and 8 are arranged at a 90 degree angle with a beam splitter as a starting point. The unit 8 is arranged in the direction which is approximately parallel to the optical axis from a collimating lens 16 to an objective lens 20 and the unit 4 is arranged in the direction which is approximately normal to the optical axis from a wavelength filter 17 to the lens 20. The lens 16 and the unit 4 are arranged so that the location of an optical source 2 becomes the focal distance of the lens 16 in terms of the optical path length in an air medium and an optical source 6 is set closer to the lens 16 than the source 2 in terms of an air length. Thus, the outgoing light beams of the source 2 become parallel light beams after passing a collimating lens 14. The divergence angle of the outgoing light beams of the source 6 is reduced after passing the lens 16.

10. 发明专利

JPH0963104A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JPH0963104A
公开(公告)日：1997-03-07
申请号：JP21198395
申请日：1995-08-21
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOJIMA KOKI , GOTO HIROSHI , KIYOMATSU SATOSHI
IPC分类号： G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To enable recording/reproducing an optical disk having a different recording density, to make a device small in size and to improve the reliability by moving an aperture arranged in an optical path and changing a numerical aperture of an objective lens. SOLUTION: When an optical disk 14 of low density is recorded/ reproduced, a light beam from a semiconductor laser 12 is passed through an aperture 2a and made incident on an objective lens 13. At this time, the aperture 2a is arranged so that the numerical aperture of the lens 13 becomes 0.45. The lens 13 forms a spot 17 on the recording surface of the disk 14 by means of its converging action, the beam is reflected according to recorded information formed on the recording surface and picked up as a recorded signal. When a disk has high density, the aperture 2a is moved to the laser 12 and arranged so that the numerical aperture of the lens 13 becomes 0.6. By controlling the beam so as to enlarging a light beam of a peripheral beam from the laser 12, it is passed through the lens 13 of the numerical aperture 0.6 and the spot 17 is formed on the recording surface of the disk 14.

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