JPS6486337A - Hologram - Google Patents
HologramInfo
- Publication number
- JPS6486337A JPS6486337A JP62243488A JP24348887A JPS6486337A JP S6486337 A JPS6486337 A JP S6486337A JP 62243488 A JP62243488 A JP 62243488A JP 24348887 A JP24348887 A JP 24348887A JP S6486337 A JPS6486337 A JP S6486337A
- Authority
- JP
- Japan
- Prior art keywords
- face
- light
- hologram
- diffracted
- simplify
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Optical Head (AREA)
Abstract
PURPOSE:To simplify an optical system and adjusting operation by providing a hologram face comprising two areas to focus the diffracted light to two different points, respectively to one face, and a diffraction grating face dividing the light beam into three light beams to the other face. CONSTITUTION:A laser beam from a laser light source 1 is divided into three light beams on the diffraction grating face 10B in transmitting through the hologram 10. Then the returned light reflected on a disk signal face via an objective lens 5 is diffracted by a prescribed angle on the hologram face 10A in transmitting through the hologram 10 again and its diffracted light is detected by 6-division photodetector 11. Thus, the detection of a focusing error, a tracking error and a reproducing signal is attained. Thus, the optical system is simplified so as to simplify the adjusting operation and to attain small size and light weight.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62243488A JP2701849B2 (en) | 1987-09-28 | 1987-09-28 | Optical pickup device |
US07/227,330 US4907847A (en) | 1987-09-28 | 1988-08-02 | Optical pickup and hologram therefor |
EP88112739A EP0309689B1 (en) | 1987-09-28 | 1988-08-04 | Optical pickup and hologram therefor |
DE88112739T DE3885224T2 (en) | 1987-09-28 | 1988-08-04 | Optical scanning device and holographic beam splitter therefor. |
US07/446,820 US5016954A (en) | 1987-09-28 | 1990-01-02 | Optical pickup and hologram therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62243488A JP2701849B2 (en) | 1987-09-28 | 1987-09-28 | Optical pickup device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6486337A true JPS6486337A (en) | 1989-03-31 |
JP2701849B2 JP2701849B2 (en) | 1998-01-21 |
Family
ID=17104635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62243488A Expired - Fee Related JP2701849B2 (en) | 1987-09-28 | 1987-09-28 | Optical pickup device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2701849B2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03173946A (en) * | 1989-09-21 | 1991-07-29 | Ricoh Co Ltd | Optical pickup device |
JPH03225635A (en) * | 1990-01-31 | 1991-10-04 | Nec Corp | Optical head device |
JPH03250437A (en) * | 1989-08-04 | 1991-11-08 | Ricoh Co Ltd | Optical information recording and reproducing device and dual diffraction grating |
US5272550A (en) * | 1991-10-11 | 1993-12-21 | International Business Machines Corporation | Hologram system |
US5331445A (en) * | 1992-08-18 | 1994-07-19 | International Business Machines Corporation | Increased Bragg angle sensitivity hologram system and method |
US5515353A (en) * | 1993-03-05 | 1996-05-07 | Olympus Optical Co., Ltd. | Optical head with forward and return light beam propagating along a common path |
US5602657A (en) * | 1992-12-17 | 1997-02-11 | International Business Machines Corporation | Hologram system having hologram layers with rotationally offset Bragg planes |
US6335809B1 (en) | 1999-02-10 | 2002-01-01 | Rohm Co., Ltd. | Optical pickup and hologram device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62103857A (en) * | 1985-10-31 | 1987-05-14 | Mitsubishi Electric Corp | Optical pickup device |
JPS644926A (en) * | 1987-06-29 | 1989-01-10 | Mitsubishi Electric Corp | Optical type head device |
JPS6455745A (en) * | 1987-08-26 | 1989-03-02 | Sharp Kk | Optical pickup device |
-
1987
- 1987-09-28 JP JP62243488A patent/JP2701849B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62103857A (en) * | 1985-10-31 | 1987-05-14 | Mitsubishi Electric Corp | Optical pickup device |
JPS644926A (en) * | 1987-06-29 | 1989-01-10 | Mitsubishi Electric Corp | Optical type head device |
JPS6455745A (en) * | 1987-08-26 | 1989-03-02 | Sharp Kk | Optical pickup device |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03250437A (en) * | 1989-08-04 | 1991-11-08 | Ricoh Co Ltd | Optical information recording and reproducing device and dual diffraction grating |
JPH03173946A (en) * | 1989-09-21 | 1991-07-29 | Ricoh Co Ltd | Optical pickup device |
JPH03225635A (en) * | 1990-01-31 | 1991-10-04 | Nec Corp | Optical head device |
US5272550A (en) * | 1991-10-11 | 1993-12-21 | International Business Machines Corporation | Hologram system |
US5331445A (en) * | 1992-08-18 | 1994-07-19 | International Business Machines Corporation | Increased Bragg angle sensitivity hologram system and method |
US5602657A (en) * | 1992-12-17 | 1997-02-11 | International Business Machines Corporation | Hologram system having hologram layers with rotationally offset Bragg planes |
US5515353A (en) * | 1993-03-05 | 1996-05-07 | Olympus Optical Co., Ltd. | Optical head with forward and return light beam propagating along a common path |
US6335809B1 (en) | 1999-02-10 | 2002-01-01 | Rohm Co., Ltd. | Optical pickup and hologram device |
Also Published As
Publication number | Publication date |
---|---|
JP2701849B2 (en) | 1998-01-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |