JPS5570942A - Tracking error detector - Google Patents

Tracking error detector

Info

Publication number
JPS5570942A
JPS5570942A JP14238878A JP14238878A JPS5570942A JP S5570942 A JPS5570942 A JP S5570942A JP 14238878 A JP14238878 A JP 14238878A JP 14238878 A JP14238878 A JP 14238878A JP S5570942 A JPS5570942 A JP S5570942A
Authority
JP
Japan
Prior art keywords
light
light source
tracking error
semiconductor laser
spot
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.)
Granted
Application number
JP14238878A
Other languages
Japanese (ja)
Other versions
JPS6136296B2 (en
Inventor
Toru Fujishima
Masanori Ogino
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14238878A priority Critical patent/JPS5570942A/en
Publication of JPS5570942A publication Critical patent/JPS5570942A/en
Publication of JPS6136296B2 publication Critical patent/JPS6136296B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To obtain the tracking error information, by locating the spot image of point light source to track direction and combining the condition change information with self coupling effect of semiconductor laser, in the optical system disc player. CONSTITUTION:The light from the semiconductor laser light source 2 is reflected on the video disc surface 4 via the lenses 3, 3', the light including the recording information returns to the light source 2, and the light including the self coupling effect of the light source 2 is incident to the information reading photo detector 1. In this case, when the light spot 5 from the light source 2 is located on the track, the light sources 2a, 2b are located so that the light spots 5a, 5b from the semiconductor laser light sources 2a, 2b are positioned by clipping the track and the light emitting plane of each light source is on the plane almost orthogonal to the light axis. Accordingly, the light output from the light sources 2a and 2b is changed on the position change of the spot 5, and the tracking error signal can be obtained with the operation 8 of the output of the photo detectors 1a and 1b corresponded.
JP14238878A 1978-11-20 1978-11-20 Tracking error detector Granted JPS5570942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14238878A JPS5570942A (en) 1978-11-20 1978-11-20 Tracking error detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14238878A JPS5570942A (en) 1978-11-20 1978-11-20 Tracking error detector

Publications (2)

Publication Number Publication Date
JPS5570942A true JPS5570942A (en) 1980-05-28
JPS6136296B2 JPS6136296B2 (en) 1986-08-18

Family

ID=15314195

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14238878A Granted JPS5570942A (en) 1978-11-20 1978-11-20 Tracking error detector

Country Status (1)

Country Link
JP (1) JPS5570942A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759007A (en) * 1981-12-10 1988-07-19 Discovision Associates Storage medium track pitch detector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445859A (en) * 1987-08-10 1989-02-20 Hirano Kinzoku Co Ltd Tenter type hot air treatment apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759007A (en) * 1981-12-10 1988-07-19 Discovision Associates Storage medium track pitch detector

Also Published As

Publication number Publication date
JPS6136296B2 (en) 1986-08-18

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