JPS6489040A - Focus controller - Google Patents
Focus controllerInfo
- Publication number
- JPS6489040A JPS6489040A JP24430887A JP24430887A JPS6489040A JP S6489040 A JPS6489040 A JP S6489040A JP 24430887 A JP24430887 A JP 24430887A JP 24430887 A JP24430887 A JP 24430887A JP S6489040 A JPS6489040 A JP S6489040A
- Authority
- JP
- Japan
- Prior art keywords
- light beam
- refracting
- passing
- beam components
- detecting
- 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 improve the sensitivity of a focus detection with the whole system kept compact by detecting convergence character light beam components passing through a refracting part and the light beam components of the convergence character not passing the refracting part, and converting them to a control signal. CONSTITUTION:A light beam emitted from a light source 11 is focused on an information recording medium 1 by using a focusing means, and the light beam components passing through plural refracting bodies provided in the light path of the reflected light beam and arranged in a point symmetry and the light beam components made incident without passing the refracting bodies are detected. The condition of the light beam focused on the information recording medium 1 is controlled by the control signal generated after the detected detecting signal is processed. Thus, since a blurring detecting signal is made hard to receive the influence of the shade of a guiding groove and a focus detecting optical system contains a combination lens having positive refracting force and negative refracting force, though the optical system is substantially compact, a focusing condition can be controlled with high sensitivity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24430887A JPS6489040A (en) | 1987-09-30 | 1987-09-30 | Focus controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24430887A JPS6489040A (en) | 1987-09-30 | 1987-09-30 | Focus controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6489040A true JPS6489040A (en) | 1989-04-03 |
Family
ID=17116804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24430887A Pending JPS6489040A (en) | 1987-09-30 | 1987-09-30 | Focus controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6489040A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01205734A (en) * | 1988-02-12 | 1989-08-18 | Matsushita Electric Ind Co Ltd | Optical head device |
-
1987
- 1987-09-30 JP JP24430887A patent/JPS6489040A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01205734A (en) * | 1988-02-12 | 1989-08-18 | Matsushita Electric Ind Co Ltd | Optical head device |
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