JPS6464142A - Optical head in optical disk recording and reproducing device - Google Patents
Optical head in optical disk recording and reproducing deviceInfo
- Publication number
- JPS6464142A JPS6464142A JP62222753A JP22275387A JPS6464142A JP S6464142 A JPS6464142 A JP S6464142A JP 62222753 A JP62222753 A JP 62222753A JP 22275387 A JP22275387 A JP 22275387A JP S6464142 A JPS6464142 A JP S6464142A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- light beam
- polarized light
- reflected
- mirror
- 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.)
- Pending
Links
Abstract
PURPOSE:To reduce the weight of a moving optical system, and to shorten the access time, by dividing an optical system for executing the recording or reproduction to and from an optical disk, into a fixed optical system and a mobile optical system, and providing a focus driving member on the fixed optical system. CONSTITUTION:A linearly polarized light of a second laser diode 69 for constituting a fixed optical system 60 is converted to a parallel luminous flux by its own collimator lens and reflected by a plane of polarization 64a of a polarized light beam splitter 64 through a half mirror 66, and emitted to a mobile optical system 80 side, as a circularly polarized light through a 1/4 wavelength plate 65. In such a way, by a built-in mirror 81 and an objective lens 82, a light beam is projected to the bit surface of an optical disk 100, and a reflected light is returned to the same path and allowed to reach a 1/4 wavelength plate 65, changed to a linearly polarized light therein and reflected by the plane of polarization 64a of the splitter 64, as a light beam being different by 90 deg., and allowed to reach a photodetector 70 through the half mirror 66. In this case, the detector 70 is divided into two in advance, its output voltage is made different from that of a detector 68 for projecting a light beam to the mirror 66 first, and a collimator lens 62 provided on a focus driving member 63 is moved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62222753A JPS6464142A (en) | 1987-09-04 | 1987-09-04 | Optical head in optical disk recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62222753A JPS6464142A (en) | 1987-09-04 | 1987-09-04 | Optical head in optical disk recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6464142A true JPS6464142A (en) | 1989-03-10 |
Family
ID=16787367
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62222753A Pending JPS6464142A (en) | 1987-09-04 | 1987-09-04 | Optical head in optical disk recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6464142A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02294945A (en) * | 1989-05-09 | 1990-12-05 | Ricoh Co Ltd | Optical recording and reproducing device |
-
1987
- 1987-09-04 JP JP62222753A patent/JPS6464142A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02294945A (en) * | 1989-05-09 | 1990-12-05 | Ricoh Co Ltd | Optical recording and reproducing device |
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