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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

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.

4. 发明专利

JP2001222839A OPTICAL PICKUP DEVICE 失效
公开(公告)号：JP2001222839A
公开(公告)日：2001-08-17
申请号：JP2000366438
申请日：2000-12-01
申请人： SANKYO SEIKI SEISAKUSHO KK , TOSHIBA CORP
发明人： YANAGISAWA KATSUSHIGE , HOTTA TORU , KASUGA IKUO , KINOSHITA AKIRA
IPC分类号： G02B5/30 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To carry out adequate recording operation, etc. by suppressing light quantity loss with an optical pickup device of a plural light source type having a common optical system and a common light receiving element. SOLUTION: The optical system of the optical pickup device has a half mirror (first beam splitter) 13 and a prism 14 (second beam splitter) 14 for introducing a first laser beam L1 for CDs and a second laser beam L2 for DVDs to an optical recording medium side and the common light receiving element 19. The half mirror 13 is nearly 20% in the transmittance of the first laser beam L1 which is P polarized light and the prism 14 is nearly 75% in the transmittance of the second laser beam L2 in which the P polarized light and S polarized light coexist. The first laser beams for CDs may be introduced to the optical recording medium without being accompanied by the light quantity loss and simultaneously the return light Lr of the sufficient light quantity may be returned to the light receiving element 19 for the purpose of forming a servo signal and therefore the sure CD recording operation may be realized by using the first laser beam.

5. 发明专利

JP2001160239A METHOD FOR MANUFACTURING OPTICAL PICKUP 失效
公开(公告)号：JP2001160239A
公开(公告)日：2001-06-12
申请号：JP34354899
申请日：1999-12-02
申请人： TOSHIBA CORP , SANKYO SEIKI SEISAKUSHO KK
发明人： TONO HIROYUKI , SHINODA MASAYUKI , KASUGA IKUO , OKINA TOSHIHIKO , YANAGISAWA KATSUSHIGE , HOTTA TORU
IPC分类号： G11B7/22
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup which may be easily assembled within a prescribed range of the angle errors of two lenses of the optical pickup of a two lens type of a shaft sliding type and an optical disk device using this optical pickup. SOLUTION: This optical pickup device 1 has an objective lens 9 for DVDs, an objective lens 8 for CDs and a sliding shaft 6 and a lens holder 7 designed to control the tracking and focusing of the respective lenses by the rotation around the sliding shaft 6 and the operation of the axial movement thereof. The individual objective lenses are fixed into guide holes (fixing parts) 78 and 79 formed in the prescribed positions of the lens holder by a sticking method using adhesion. As a result, the track errors and crosstalks are decreased and the stable reproduction of information from the individual optical disks is made possible.

6. 发明专利

JP2001184695A OPTICAL HEAD DEVICE 失效
公开(公告)号：JP2001184695A
公开(公告)日：2001-07-06
申请号：JP37156499
申请日：1999-12-27
申请人： TOSHIBA CORP , SANKYO SEIKI SEISAKUSHO KK
发明人： KINOSHITA AKIRA , KASUGA IKUO , OKINA TOSHIHIKO , YANAGISAWA KATSUSHIGE , HOTTA TORU
IPC分类号： G11B7/125 , G02B5/30 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To obtain the optimum circular polarization for a second light source and to reduce the effect of double refractivity of a recording medium in using light from a first light source, even in such an arrangement of optical elements that light beams from the first and second light sources form a common optical path. SOLUTION: The device is provided with the first and second light sources 11, 21 for reproducing a storage medium of low and high density respectively, with the first lens means 12, 13, 14 that guide the light beams emitted from these two light sources to the common optical path, and with the lens means 8, 9 that converge the light beams of the common optical path to emit to the data recording face of the storage medium. In addition, as a phase delay element 40, one with a phase delay of roughly 90+180 n degrees (n is an integer) is provided for the light beam of the second wavelength and one with roughly 180 n degrees for the first wavelength.

7. 发明专利

JP2001160230A OPTICAL HEAD DEVICE 失效
公开(公告)号：JP2001160230A
公开(公告)日：2001-06-12
申请号：JP34274799
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 , KUROSAWA HIDEO , SAI HIDENORI , SHINODA MASAYUKI
IPC分类号： G11B7/09 , G11B7/12
摘要： PROBLEM TO BE SOLVED: To provide an optical head device having a use lens detecting mechanism capable of always well maintaining use lens detecting sensitivity without being affected by a mounting posture. SOLUTION: The optical head device 1 has the use lens detecting mechanism 20 for detecting which of objective lenses 101 and 103 exists in an operating position. The use lens detecting mechanism 20 has a light reflection surface 21 formed at a lens holder 102 in order to reflect part of a laser beam while the objective lens 103 is used and a photodetector 22 mounted at a holder supporting unit 105 in order to receive the reflected light reflected by the light reflection surface 21. The major axis direction MJ of an FFP of the laser beam L aligns to a direction where the light reflection surface 21 is installed. Then, even if the light reflection surface 21 formed at the lens holder 10 is moved by the mounting posture, the photodetector 22 may be always irradiated with the reflected laser beam L21 of a sufficient light quantity and therefore the use lens detection is eventually executed with the always good detection sensitivity without being affected by the mounting posture.

8. 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.

9. 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.

10. 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.

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