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1. 发明专利

JP2001160238A OPTICAL HEAD DEVICE AND OPTICAL DISK DRIVE DEVICE 失效
公开(公告)号：JP2001160238A
公开(公告)日：2001-06-12
申请号：JP34355099
申请日：1999-12-02
申请人： TOSHIBA CORP , SANKYO SEIKI SEISAKUSHO KK
发明人： KINOSHITA AKIRA , KASUGA IKUO
IPC分类号： G11B7/135 , G11B19/12
摘要： PROBLEM TO BE SOLVED: To provide a device having a reproducing function of DVDs and CDs and a recording ad reproducing function of CD system recording media, such as CD-Rs and CD-RWs. SOLUTION: The captioned numbers 8 and 9 denote objective lenses which are selectively changed over to focus and cast incident light to disks CD and DVD and to allow the passage of the reflected light from the disks to a direction reverse from incidence. First and second light sources 11 and 21 emit first and second light rays. Beam splitter 12 and 13, a collimating lens 14 and a return mirror 15 introduce the first and second light rays to the objective lens and introduce the first and second disk reflected light rays to a photodetector 19. The photodetector 19 detects the first and second reflected light rays, converts these light rays to electric signals and outputs these signals.

2. 发明专利

JP2001160228A OPTICAL PICKUP DEVICE AND METHOD FOR MANUFACTURING THE SAME 失效
公开(公告)号：JP2001160228A
公开(公告)日：2001-06-12
申请号：JP34295699
申请日：1999-12-02
申请人： SANKYO SEIKI SEISAKUSHO KK , TOSHIBA CORP
发明人： YANAGISAWA KATSUSHIGE , HOTTA TORU , KASUGA IKUO , OKINA TOSHIHIKO , KINOSHITA AKIRA , SAI HIDENORI
IPC分类号： G11B7/00 , G11B7/12 , G11B7/125 , G11B7/127 , G11B7/22
摘要： PROBLEM TO BE SOLVED: To prevent respective light sources of an optical pickup device having the plural light sources from falling to an overheating state. SOLUTION: The optical pickup device 1 has a laser diode 2 for recording having a calorific value as a stationary side light source mounted at a mounting section 5 of its device frame 4 and a laser diode 3 for reproducing as a regulation side light source held in a holder 6 fixed by an adhesive 7 by opening a spacing 46 on the flank 45 of the device frame. The heat generated by the laser diode 2 for recording is efficiently released via the device frame 4 and the heat generated by the laser diode 3 is also efficiently released via the holder 6 fixed by the adhesive 7 partially packed in the device frame 4 by opening the spacing 46.

3. 发明专利

JPH09265645A OBJECTIVE LENS DRIVING DEVICE FOR OPTICAL PICKUP 失效
公开(公告)号：JPH09265645A
公开(公告)日：1997-10-07
申请号：JP7551696
申请日：1996-03-29
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： KASUGA IKUO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To prevent a power feeding flexible printed board from being obstructive to movement of a lens holder and also the occurrence of a flaw or a short circuit of a conductive foil of the board due to contact with the lens holder by making the board 2-layered structive and disposing this board between the lens holder and a frame to be slackened in a circular-arcuate shape. SOLUTION: The flexible printed board 8 is provided round from the side of the frame 2 to the side of the lens holder 3, and this structure is of two layers composed of an insulating base layer 801 consisting of polyimide, etc., and a wiring pattern of a copper foil 803, and is very flexible. This board 8 is disposed in an approximately circular-arcuate shape between the lens holder 3 and the frame 2 to position its wiring pattern of the copper foil 803 under the exposing state on the inner side. By this method, rotary motion of the lens holder 3 is not obstructed by the flexible board 8. In addition, there is no fear of occurrence of a short circuit and disconnection, etc., due to contact of the copper foil 803 under the exposed state with other parts, and then flexure resistance is enhanced.

4. 发明专利

JPH09265643A OBJECTIVE LENS DRIVING DEVICE FOR OPTICAL PICKUP 失效
公开(公告)号：JPH09265643A
公开(公告)日：1997-10-07
申请号：JP7158296
申请日：1996-03-27
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： KASUGA IKUO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To provide a new structure for removing the play between an objective lens and a sliding shaft in a shaft sliding type objective lens driving device of an optical pickup. SOLUTION: An objective lens driving device 20 of an optical pickup is provided with a pair of magnetic pieces 10A, 10B for returning a lens holder 1 to a magnetically neutral position. The magnetic pieces 10A, 10B are mounted on the position shifted by the same angle in the reverse direction to the magnetically neutral position (straight line L1) on the outer periphery of the lens holder 1. Depressing force F pressing the holder in the lateral direction to a sliding shaft 7 is exerted on the lens holder 1 by magnetic force generated between the magnetic pieces 10A, 10B and the corresponding tracking magnet part. The play between the lens holder 1 and the sliding shaft 7 is removed by the depressing force. By the simple constitution for changing the mounting position of a pair of magnetic pieces 10A, 10B for returning the lens holder 1 to the magneti-cally neutral position, the play between the lens holder 1 and the sliding shaft 7 is removed.

5. 发明专利

JPH08124183A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JPH08124183A
公开(公告)日：1996-05-17
申请号：JP24881995
申请日：1995-09-01
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： TAKEDA TADASHI , HAYASHI YOSHIO , KASUGA IKUO , HIGASHIURA KAZUO
IPC分类号： G11B7/09 , G11B7/135
摘要： PURPOSE: To eliminate the effect of a desensitized area of a divided photodetector, to detect a signal highly sensitively and to simplify a device by providing a hologram element provided with a hologram pattern of which diffraction condition is different from each other on an optical path between a light source and a recording medium. CONSTITUTION: A tracking error signal TE and a focusing error signal FE are obtained by luminous fluxes (± first-order light beams) diffracted by the hologram element having a diffraction grating, and on the other hand, a zero- order light component not diffracted is used only for obtaining a high frequency signal RF. Thus, since the necessity using the divided detector is eliminated for detecting the high frequency signal RF, and the effect of the desensitized area of the photodetector is eliminated, the signal with an excellent jitters characteristic is detected without changing the amplitude of the high frequency signal RF even when a spot size is increased/decreased, and a spot position is moved. Further, by integrating the photodetectors, and by using only irreducible minimum photodetectors 21-23, signal processing is simplified.

6. 发明专利

JPH06271770A POLY(ARYLENE SULFIDE) RESIN COMPOSITION AND OPTICAL PICKUP PART MADE USING THE SAME 失效
公开(公告)号：JPH06271770A
公开(公告)日：1994-09-27
申请号：JP31260593
申请日：1993-11-17
申请人： SHIKOKU CHEM , SANKYO SEIKI SEISAKUSHO KK
发明人： OGAWA SHOGO , HATA HAJIME , HAYAKAWA MASAMICHI , KASUGA IKUO
IPC分类号： C08K3/00 , C08K7/02 , C08K7/18 , C08L81/02 , G11B7/12
摘要： PURPOSE:To provide the subject composition which has excellent flowability and good moldability and is useful as the material of a reliable optical pickup part which does not cause optical axis shifting even when the atmosphere changes. CONSTITUTION:20-40wt.% poly(arylene sulfide) resin is mixed with 20-55wt.% fibrous filler and 5-60wt.% particulate filler having a specific gravity less than 3.5 and comprising aluminum borate, a blast furnace slag, etc., to obtain the objective composition having a specific gravity of 1.7 or higher.

7. 发明专利

JPH01317234A OBJECTIVE LENS DRIVING DEVICE 失效
公开(公告)号：JPH01317234A
公开(公告)日：1989-12-21
申请号：JP14846388
申请日：1988-06-16
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： KASUGA IKUO , KAMATA TORU
IPC分类号： G11B7/09
摘要： PURPOSE:To improve the reliability and to attain a low price for an objective lens driving device by producing the restoring force in a 2-dimensional way in both focusing and tracking directions by means of a pair of magnetic pieces. CONSTITUTION:A focusing drive coil 4 and a tracking drive coil 3 are fixed on the outer circumference of a lens holder 1 at the symmetrical positions centering on an axis 7. The magnets 6 set opposite to both coils 3 and 4 are polarized and magnetized in both focusing and tracking directions respectively. Then the magnetic pieces 10 are set into a magnetic circuit including the polarized and magnetized magnets 6. Thus the restoring force is produced 2- dimensionally in both focusing and tracking directions by the magnetic attracting force action on the pieces 10. As a result, an objective lens is held at a neutral point and to improve the reliability of an objective lens driving device together with reduction of the cost.

8. 发明专利

JPS61239436A METHOD FOR DETECTING TRACKING ERROR SIGNAL 失效
公开(公告)号：JPS61239436A
公开(公告)日：1986-10-24
申请号：JP8106985
申请日：1985-04-16
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： HAYASHI YOSHIO , KASUGA IKUO
IPC分类号： G11B7/09
摘要： PURPOSE:To eliminate a tracking error due to offset by deleting the offset out of a tracking error signal. CONSTITUTION:A photodetector 4 is divided symmetrically into light receiving parts 41/42 and 43/44 centering on an axis corresponding to the bit array direction (recording track direction). The output signals A and B of parts 41 and 42 are added together by an addition circuit 61 via amplifiers 51 and 52. While the output signals A and B of parts 43 and 44 are added together by an addition circuit 62 via amplifiers 53 and 54. The signal components produced by pit trains are deleted out of the output signals E and F of both circuits 61 and 62 through low pass filters (LPFs) 8 and 9 having cut-off frequency of about 20kHz. Then the output signal H of the LPF 9 is subtracted from the output signal G to the LPF 8 by a subtraction circuit 63. The output signal K of the circuit 63 is equal to a tracking error signal detected by the push-pull method and includes offset.

9. 发明专利

JP2001160237A OPTICAL HEAD DEVICE AND OPTICAL DISK DRIVE DEVICE 失效
公开(公告)号：JP2001160237A
公开(公告)日：2001-06-12
申请号：JP34354999
申请日：1999-12-02
申请人： TOSHIBA CORP , SANKYO SEIKI SEISAKUSHO KK
发明人： KINOSHITA AKIRA , KASUGA IKUO
IPC分类号： G11B7/09 , G11B7/12 , G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a device having a reproducing function of DVDs and CDs and a recording and reproducing function of CD system recording media, such as CD-Rs and CD-RWs. SOLUTION: The captioned number 8 denotes an objective lens of a focal length f1 and a numerical aperture NA1 and the captioned number 9 denotes an objective lens of a numerical aperture NA2 and (f1/f2)>(NA2/NA1), f1>f2. The captioned numbers 8 and 9 are selectively changed over to focus and cast incident light to a disk CD and DVD and to allow the passage of the reflected light from the disks to a direction reverse from incidence. First and second light sources 11 and 21 emit first and second light rays. Beam splitters 12 and 13, a collimating lens 14 and a return mirror 15 introduce the first and second light rays to the objective lens and introduce the first and second disk reflected light rays corresponding to the first and second light rays to a photodetector 19. The photodetector 19 detects the first and second reflected light rays, converts these light rays to electric signals and outputs these signals.

10. 发明专利

JP2001023179A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001023179A
公开(公告)日：2001-01-26
申请号：JP19254099
申请日：1999-07-07
申请人： SANKYO SEIKI SEISAKUSHO KK
发明人： HOTTA TORU , KASUGA IKUO , YANAGISAWA KATSUSHIGE
IPC分类号： G11B7/08 , G02B7/10 , G11B7/085 , G11B7/22
摘要： PROBLEM TO BE SOLVED: To obtain an optical pickup device with an inclination angle-adjusting mecha nism for adjusting the inclination angle of an objective lens around the axial line in the tangential direction of an optical disk and around the axial line in the radius direction of the optical disk by turning an inclination angle-adjusting screw. SOLUTION: The optical pickup device 1 is provided with a first inclination angle- adjusting mechanism for inclining an objective lens 2 with a first axial line L1 that is extended in the tangential direction of an optical disk and at the same time passes through the center of a sub axis guide groove 501 as the center, and a second inclination angle-adjusting mechanism for inclining the objective lens 2 with a second axial line L2 that agrees with the center of a spindle being extended in the radius direction of the optical disk as a center. Then, each inclination angle-adjusting mechanism adjusts the inclination angle of the objective lens by adjusting the inclination of a spindle guide frame 4 and a sub-axis guide frame 5 being mounted by turning respective inclination angle-adjusting screws so that it can be inclined with the first and third axial lines L1 and L3 as a center for a main frame 3. Both the inclination angle- adjusting mechanisms are in the same structure and adjust inclination angle around both the axes by turning an inclination angle-adjusting screw.

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