JPS6489040A - Focus controller - Google Patents

Focus controller

Info

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
Application number
JP24430887A
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 JP24430887A priority Critical patent/JPS6489040A/en
Publication of JPS6489040A publication Critical patent/JPS6489040A/en
Pending legal-status Critical Current

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.
JP24430887A 1987-09-30 1987-09-30 Focus controller Pending JPS6489040A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01205734A (en) * 1988-02-12 1989-08-18 Matsushita Electric Ind Co Ltd Optical head device

Cited By (1)

* Cited by examiner, † Cited by third party
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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