JPS6476427A - Signal detecting optical system for optical head - Google Patents

Signal detecting optical system for optical head

Info

Publication number
JPS6476427A
JPS6476427A JP23179987A JP23179987A JPS6476427A JP S6476427 A JPS6476427 A JP S6476427A JP 23179987 A JP23179987 A JP 23179987A JP 23179987 A JP23179987 A JP 23179987A JP S6476427 A JPS6476427 A JP S6476427A
Authority
JP
Japan
Prior art keywords
light receiving
focusing
receiving part
areas
signal 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
JP23179987A
Other languages
Japanese (ja)
Inventor
Koichiro Nishikawa
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP23179987A priority Critical patent/JPS6476427A/en
Publication of JPS6476427A publication Critical patent/JPS6476427A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the interference of a tracking error component with focusing error detection by providing a third light receiving part, which does not use focusing error detection, between first and second light receiving parts of a photodetector. CONSTITUTION:A first light receiving part 21 consisting of two light receiving areas 22a and 22b, and a third light receiving part 23 provided between first and second light receiving parts 21 and 22 are arranged in the photodetector provided on the position where a return beam is circular at the time of focusing an optical disk. By this constitution, most of tracking error areas E and E' are positioned in the third light receiving part 23 and occupy only a small area in the first and second light receiving parts 21 and 22 used for focusing error detection in the focusing state of the optical disk, and the disturbance component applied to a focusing error signal by the change of the quantity of light in tracking error areas E and E' is suppressed.
JP23179987A 1987-09-16 1987-09-16 Signal detecting optical system for optical head Pending JPS6476427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23179987A JPS6476427A (en) 1987-09-16 1987-09-16 Signal detecting optical system for optical head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23179987A JPS6476427A (en) 1987-09-16 1987-09-16 Signal detecting optical system for optical head

Publications (1)

Publication Number Publication Date
JPS6476427A true JPS6476427A (en) 1989-03-22

Family

ID=16929205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23179987A Pending JPS6476427A (en) 1987-09-16 1987-09-16 Signal detecting optical system for optical head

Country Status (1)

Country Link
JP (1) JPS6476427A (en)

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