JPS6489038A - Focus controller - Google Patents

Focus controller

Info

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
Application number
JP24430587A
Other languages
Japanese (ja)
Inventor
Takeshi Ishika
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Intelligent Technology Co Ltd
Original Assignee
Toshiba Corp
Toshiba Intelligent Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Intelligent Technology Co Ltd filed Critical Toshiba Corp
Priority to JP24430587A priority Critical patent/JPS6489038A/en
Publication of JPS6489038A publication Critical patent/JPS6489038A/en
Pending legal-status Critical Current

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.
JP24430587A 1987-09-30 1987-09-30 Focus controller Pending JPS6489038A (en)

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)

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