JPS641126A - Optical pickup device - Google Patents

Optical pickup device

Info

Publication number
JPS641126A
JPS641126A JP15495587A JP15495587A JPS641126A JP S641126 A JPS641126 A JP S641126A JP 15495587 A JP15495587 A JP 15495587A JP 15495587 A JP15495587 A JP 15495587A JP S641126 A JPS641126 A JP S641126A
Authority
JP
Japan
Prior art keywords
optical path
path length
length difference
photodetectors
glass
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
JP15495587A
Other languages
Japanese (ja)
Other versions
JPH011126A (en
Inventor
Hiroshi Yoshimatsu
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP15495587A priority Critical patent/JPS641126A/en
Publication of JPH011126A publication Critical patent/JPH011126A/en
Publication of JPS641126A publication Critical patent/JPS641126A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To attain small size of a device by arranging a 1st and 2nd photodetectors on same plane and making 1st or 2nd light outputted from an optical path length difference generating means comprising a lamination of glass and uniaxial crystal substance into the 1st or 2nd focus error photodetector in front or at the back of its focus.
CONSTITUTION: The optical path length difference generating means 13 comprising a lamination of glass and uniaxial crystal substance having an optical axis of a prescribed direction is arranged with a tilt of nearly 45° with respect to the optical path. When the optical path length difference generating means 13 passes reflected light from a collimator lens 3, the light passing through the glass 15 is separated into a normal ray and an abnormal ray in the process of passing through a crystal 16, a difference is caused to the optical path length of two output lights in response to the refractive index of them and spots 11, 12 are formed respectively to the 1st and 2nd photodetectors 7, 8. Since the two light beams collimated nearly and having an optical path length difference are obtained, the 1st and 2nd photodetectors 7, 8 are arranged on same base 14 to form the optical pickup device to be of small size.
COPYRIGHT: (C)1989,JPO&Japio
JP15495587A 1987-06-22 1987-06-22 Optical pickup device Pending JPS641126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15495587A JPS641126A (en) 1987-06-22 1987-06-22 Optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15495587A JPS641126A (en) 1987-06-22 1987-06-22 Optical pickup device

Publications (2)

Publication Number Publication Date
JPH011126A JPH011126A (en) 1989-01-05
JPS641126A true JPS641126A (en) 1989-01-05

Family

ID=15595561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15495587A Pending JPS641126A (en) 1987-06-22 1987-06-22 Optical pickup device

Country Status (1)

Country Link
JP (1) JPS641126A (en)

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