JPS644926A - Optical type head device - Google Patents
Optical type head deviceInfo
- Publication number
- JPS644926A JPS644926A JP62161672A JP16167287A JPS644926A JP S644926 A JPS644926 A JP S644926A JP 62161672 A JP62161672 A JP 62161672A JP 16167287 A JP16167287 A JP 16167287A JP S644926 A JPS644926 A JP S644926A
- Authority
- JP
- Japan
- Prior art keywords
- diffraction grating
- plane
- light source
- light
- optical device
- 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
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE:To realize three functions by an optical device block and to simplify the constitution of an optical system constituent, by forming separately three condensing spots by a first diffraction grating, and providing a processing function for a beam splitter and the detection of the deviation of focus by a second diffraction grating. CONSTITUTION:An optical device is constituted of the optical device block 30 having a first plane 35 at a light source 1 side confronting with a second lane 36 at a condenser means 7 side, and the first diffraction grating 31 is formed on the first plane 35, and the second diffraction grating 32 on the second plane 36. The first diffraction grating 31 forms three condensing spots separately on an information recording medium, and the second diffraction grating 32 introduces an emitted light beam from the light source 1 to a condensing means 7 as transmission 0th-order diffracted light, and also, separates the light beam reflected from the information recording medium from emitted light from the light source 1 as transmission 1st-order diffracted light, and also, performs a processing to detect the deviation of the focus. In such a way, it is possible to realize the function of a lens, etc., with one optical component, and to reduce the cost and the assembling time of a device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62161672A JPH073700B2 (en) | 1987-06-29 | 1987-06-29 | Optical head device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62161672A JPH073700B2 (en) | 1987-06-29 | 1987-06-29 | Optical head device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7342135A Division JP2629657B2 (en) | 1995-12-28 | 1995-12-28 | Optical element block of optical head device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS644926A true JPS644926A (en) | 1989-01-10 |
JPH073700B2 JPH073700B2 (en) | 1995-01-18 |
Family
ID=15739649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62161672A Expired - Lifetime JPH073700B2 (en) | 1987-06-29 | 1987-06-29 | Optical head device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH073700B2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6455745A (en) * | 1987-08-26 | 1989-03-02 | Sharp Kk | Optical pickup device |
JPS6455746A (en) * | 1987-08-26 | 1989-03-02 | Sharp Kk | Optical pickup device |
JPS6486337A (en) * | 1987-09-28 | 1989-03-31 | Nippon Denki Home Electronics | Hologram |
JPH0279231A (en) * | 1988-09-16 | 1990-03-19 | Nec Home Electron Ltd | Hologram unit and optical pickup |
JPH03250437A (en) * | 1989-08-04 | 1991-11-08 | Ricoh Co Ltd | Optical information recording and reproducing device and dual diffraction grating |
JPH05250699A (en) * | 1991-12-31 | 1993-09-28 | Samsung Electron Co Ltd | Optical pickup |
US5253237A (en) * | 1989-06-06 | 1993-10-12 | Sharp Kabushiki Kaisha | Optical head device |
US5727009A (en) * | 1994-07-29 | 1998-03-10 | Sanyo Electric Co., Ltd. | Semiconductor laser apparatus and optical pickup apparatus using the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5317705A (en) * | 1976-08-02 | 1978-02-18 | Hitachi Ltd | Automatic focusing system |
JPS6028044A (en) * | 1983-07-26 | 1985-02-13 | Toshiba Corp | Optical information reader |
-
1987
- 1987-06-29 JP JP62161672A patent/JPH073700B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5317705A (en) * | 1976-08-02 | 1978-02-18 | Hitachi Ltd | Automatic focusing system |
JPS6028044A (en) * | 1983-07-26 | 1985-02-13 | Toshiba Corp | Optical information reader |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6455745A (en) * | 1987-08-26 | 1989-03-02 | Sharp Kk | Optical pickup device |
JPS6455746A (en) * | 1987-08-26 | 1989-03-02 | Sharp Kk | Optical pickup device |
JPS6486337A (en) * | 1987-09-28 | 1989-03-31 | Nippon Denki Home Electronics | Hologram |
JPH0279231A (en) * | 1988-09-16 | 1990-03-19 | Nec Home Electron Ltd | Hologram unit and optical pickup |
US5253237A (en) * | 1989-06-06 | 1993-10-12 | Sharp Kabushiki Kaisha | Optical head device |
JPH03250437A (en) * | 1989-08-04 | 1991-11-08 | Ricoh Co Ltd | Optical information recording and reproducing device and dual diffraction grating |
JPH05250699A (en) * | 1991-12-31 | 1993-09-28 | Samsung Electron Co Ltd | Optical pickup |
US5727009A (en) * | 1994-07-29 | 1998-03-10 | Sanyo Electric Co., Ltd. | Semiconductor laser apparatus and optical pickup apparatus using the same |
Also Published As
Publication number | Publication date |
---|---|
JPH073700B2 (en) | 1995-01-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080118 Year of fee payment: 13 |