JPS6489037A - Focus controller - Google Patents

Focus controller

Info

Publication number
JPS6489037A
JPS6489037A JP24430487A JP24430487A JPS6489037A JP S6489037 A JPS6489037 A JP S6489037A JP 24430487 A JP24430487 A JP 24430487A JP 24430487 A JP24430487 A JP 24430487A JP S6489037 A JPS6489037 A JP S6489037A
Authority
JP
Japan
Prior art keywords
light beam
passing
refracting body
detecting
components
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
JP24430487A
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 JP24430487A priority Critical patent/JPS6489037A/en
Publication of JPS6489037A publication Critical patent/JPS6489037A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To make an optical system, in which a high-sensitive detecting signal is obtained compact by detecting light beam components passing through a refracting body and the light beam components not passing through the refracting body, and generating a control signal. CONSTITUTION:A reflecting light beam from an information recording medium 1 is focused by a focusing means, and the approximate half of the focused light beam are shielded by a shielding means 18. The approximate half of the components of the light beam not to be shielded by the shielding means 18 pass through the refracting body and are directed to a light detecting means 19. At the time of passing through the refracting body, to the light beam components, a divergence character is slightly given. Consequently, the light beam components passing through the refracting body and the light beam components not passing through the refracting body are directed to focusing points mutually different, and beam spot segments different in size are formed on the light detecting means 19. The form change is detected by the detecting means, and converted to the control signal by a control means. Thus, the compact optical system detecting a focus and a track with a high sensitivity can be obtained.
JP24430487A 1987-09-30 1987-09-30 Focus controller Pending JPS6489037A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24430487A JPS6489037A (en) 1987-09-30 1987-09-30 Focus controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24430487A JPS6489037A (en) 1987-09-30 1987-09-30 Focus controller

Publications (1)

Publication Number Publication Date
JPS6489037A true JPS6489037A (en) 1989-04-03

Family

ID=17116746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24430487A Pending JPS6489037A (en) 1987-09-30 1987-09-30 Focus controller

Country Status (1)

Country Link
JP (1) JPS6489037A (en)

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