JPS6489038A - Focus controller - Google Patents
Focus controllerInfo
- Publication number
- JPS6489038A JPS6489038A JP24430587A JP24430587A JPS6489038A JP S6489038 A JPS6489038 A JP S6489038A JP 24430587 A JP24430587 A JP 24430587A JP 24430587 A JP24430587 A JP 24430587A JP S6489038 A JPS6489038 A JP S6489038A
- Authority
- JP
- Japan
- Prior art keywords
- detecting
- signal
- light beam
- light
- recording medium
- 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 stably control a focus and to simplify a detecting circuit by processing a detecting signal from the signal output terminal of a detecting means and converting it to a signal to control least a focusing means. CONSTITUTION:A light beam emitted from a light source 11 is focused on an information recording medium 1 by using a focusing means, and light beam components passing through plural refracting bodies provided in the light path of the light beam reflected from the information recording medium 1 and arranged in a point symmetry and the light beam components made incident without passing the refracting bodies are detected. The detected detecting signal is processed, the control signal is generated, and the condition of the light beam focused on the information recording medium 1 is controlled by the control signal. Thus, a blurring detecting signal is made hard to receive the influence of the shade of a guiding groove, and the light detector 19 is divided into 2n- number of light detecting areas. Since the areas are mutually connected to each other and connected to four detecting signal output terminals, the circuit constitution of a converting circuit processing the detecting signal can be simplified.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24430587A JPS6489038A (en) | 1987-09-30 | 1987-09-30 | Focus controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24430587A JPS6489038A (en) | 1987-09-30 | 1987-09-30 | Focus controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6489038A true JPS6489038A (en) | 1989-04-03 |
Family
ID=17116761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24430587A Pending JPS6489038A (en) | 1987-09-30 | 1987-09-30 | Focus controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6489038A (en) |
-
1987
- 1987-09-30 JP JP24430587A patent/JPS6489038A/en active Pending
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