JPS647332A - Focus controller - Google Patents
Focus controllerInfo
- Publication number
- JPS647332A JPS647332A JP16289487A JP16289487A JPS647332A JP S647332 A JPS647332 A JP S647332A JP 16289487 A JP16289487 A JP 16289487A JP 16289487 A JP16289487 A JP 16289487A JP S647332 A JPS647332 A JP S647332A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lenses
- light
- reflected
- converged
- 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
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To attain stable focus control by using a detection light from a combination lens comprising a spherical lens having a positive refraction and two astigmatism lenses having a negative refraction so as to control the focus of a converged light onto a recording medium. CONSTITUTION:A radiated laser beam L is reflected in the recording film of an optical disk 1 and the divergent reflected laser beam is converged into a collimated luminous flux by an objective lens 16 at focusing. The light is reflected in the half prism 14 and led to a spherical lens 17 having a positive refraction in the combination lens 10, passes through the lens 17 and is made incident in the two astigmatism lenses 18, 20 having a negative refraction being components of the lens 10 arranged in the optical path of the beam L. The side end face of the lenses 18, 20 is arranged so as to be in contact with each other on the optical axis of the lens 17. The light beam from the lenses 18, 20 is subject to detection of two kinds of signals by the photodetector 19 and the focus of the converged light onto the disk 1 is controlled by using the two kinds of the signals. Thus, stable focus control is attained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16289487A JPS647332A (en) | 1987-06-30 | 1987-06-30 | Focus controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16289487A JPS647332A (en) | 1987-06-30 | 1987-06-30 | Focus controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647332A true JPS647332A (en) | 1989-01-11 |
Family
ID=15763266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16289487A Pending JPS647332A (en) | 1987-06-30 | 1987-06-30 | Focus controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647332A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5153864A (en) * | 1989-03-31 | 1992-10-06 | Kabushiki Kaisha Toshiba | Focusing detection optical path for an optical information processing system |
-
1987
- 1987-06-30 JP JP16289487A patent/JPS647332A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5153864A (en) * | 1989-03-31 | 1992-10-06 | Kabushiki Kaisha Toshiba | Focusing detection optical path for an optical information processing system |
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