JPS6419534A - Optical pickup - Google Patents

Optical pickup

Info

Publication number
JPS6419534A
JPS6419534A JP17386087A JP17386087A JPS6419534A JP S6419534 A JPS6419534 A JP S6419534A JP 17386087 A JP17386087 A JP 17386087A JP 17386087 A JP17386087 A JP 17386087A JP S6419534 A JPS6419534 A JP S6419534A
Authority
JP
Japan
Prior art keywords
lens
spot
grating
plaid
lightening
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
JP17386087A
Other languages
Japanese (ja)
Inventor
Masayuki Kato
Fumio Yamagishi
Hiroyuki Ikeda
Tomoji Maeda
Masafumi Inagaki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17386087A priority Critical patent/JPS6419534A/en
Publication of JPS6419534A publication Critical patent/JPS6419534A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To reduce the number of parts and to realize miniaturization and lightening by using a plaid square inline type grating lens in a concentric shape for a diffraction grating and generating a side spot at both sides of a main spot. CONSTITUTION:The inline type grating lens 31 having an about concentric plaid square is used as the diffraction grating of an optical pickup. The specified light using efficiency relaying on a polarizing state is given to this lens 31 and side spots 13b, 13c are generated at both sides of the beam spot (main spot) 13a for reading a signal according to the diffraction efficiency distribution of a laser light thereby. The conventional beam focusing lens is made unnecessary, the number of parts is reduced and the miniaturization and lightening are realized by using the grating lens equipped with both of a side spot forming function and beam focusing function.
JP17386087A 1987-07-14 1987-07-14 Optical pickup Pending JPS6419534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17386087A JPS6419534A (en) 1987-07-14 1987-07-14 Optical pickup

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17386087A JPS6419534A (en) 1987-07-14 1987-07-14 Optical pickup

Publications (1)

Publication Number Publication Date
JPS6419534A true JPS6419534A (en) 1989-01-23

Family

ID=15968483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17386087A Pending JPS6419534A (en) 1987-07-14 1987-07-14 Optical pickup

Country Status (1)

Country Link
JP (1) JPS6419534A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100887219B1 (en) * 2004-03-31 2009-03-06 가부시키가이샤 도쿄 웰드 Method of classifying and conveying work

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100887219B1 (en) * 2004-03-31 2009-03-06 가부시키가이샤 도쿄 웰드 Method of classifying and conveying work

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