JPS6448232A - Optical pickup device - Google Patents

Optical pickup device

Info

Publication number
JPS6448232A
JPS6448232A JP20373787A JP20373787A JPS6448232A JP S6448232 A JPS6448232 A JP S6448232A JP 20373787 A JP20373787 A JP 20373787A JP 20373787 A JP20373787 A JP 20373787A JP S6448232 A JPS6448232 A JP S6448232A
Authority
JP
Japan
Prior art keywords
detecting
optical beam
photodetected
signal
light
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
JP20373787A
Other languages
Japanese (ja)
Inventor
Ryoichi Kawasaki
Tomio Uchida
Noriyoshi Oyama
Masami Shimizu
Kozo Suzuki
Chikashi Yoshinaga
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP20373787A priority Critical patent/JPS6448232A/en
Publication of JPS6448232A publication Critical patent/JPS6448232A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To detect the focus dislocation of an optical beam to the signal surface of a signal recording medium by comparing a signal obtained from a first detecting part and the sum signal of signals respectively obtained from second and third detecting parts. CONSTITUTION:A first detecting part 9 is formed according to one astigmatism direction generated on a detecting surface to detect the focus dislocation of the optical beam. Then, the second and third detecting parts 10 and 11 are parallely provided according to the other astigmatism direction generated on the detecting surface so that the first detecting part 9 can be put between them. When the focus dislocation is generated in one direction of the optical beam, quantity of light to be photodetected by the first detecting part 9 is increased and the quantity of light to be photodetected by the second and third detecting parts 10 and 11 is decreased. When the focus dislocation is generated in the other direction of the optical beam, inversely, the quantity of light to be photodetected by the first detecting part 9 is decreased and the quantity of light to be photodetected by the second and third detecting parts 10 and 11 is increased. Thus, the focus dislocation of the optical beam to the signal surface of the signal recording medium can be detected.
JP20373787A 1987-08-17 1987-08-17 Optical pickup device Pending JPS6448232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20373787A JPS6448232A (en) 1987-08-17 1987-08-17 Optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20373787A JPS6448232A (en) 1987-08-17 1987-08-17 Optical pickup device

Publications (1)

Publication Number Publication Date
JPS6448232A true JPS6448232A (en) 1989-02-22

Family

ID=16479019

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20373787A Pending JPS6448232A (en) 1987-08-17 1987-08-17 Optical pickup device

Country Status (1)

Country Link
JP (1) JPS6448232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5554153A (en) * 1994-08-29 1996-09-10 Cell Robotics, Inc. Laser skin perforator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5554153A (en) * 1994-08-29 1996-09-10 Cell Robotics, Inc. Laser skin perforator

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