JPS6484447A - Optical head device - Google Patents

Optical head device

Info

Publication number
JPS6484447A
JPS6484447A JP62239040A JP23904087A JPS6484447A JP S6484447 A JPS6484447 A JP S6484447A JP 62239040 A JP62239040 A JP 62239040A JP 23904087 A JP23904087 A JP 23904087A JP S6484447 A JPS6484447 A JP S6484447A
Authority
JP
Japan
Prior art keywords
light
photoelectric converting
spots
light quantity
irradiation
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
JP62239040A
Other languages
Japanese (ja)
Other versions
JPH0778902B2 (en
Inventor
Hideaki Sato
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62239040A priority Critical patent/JPH0778902B2/en
Publication of JPS6484447A publication Critical patent/JPS6484447A/en
Publication of JPH0778902B2 publication Critical patent/JPH0778902B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To constitute a transversal filter, and to perform the correction of a reproduced signal by providing a means to adjust the respective irradiation light quantity of plural light fluxes or the means to adjust the output of respective photoelectric converting means. CONSTITUTION:Emitted light from light sources 1,2,3 forms three irradiation spots 14,15,16 on a track 12 on a recording medium 11 by an optical system 8, and its reflected light is changed again in its direction by a beam splitter 7, and reforms an image on a photoelectric converting element 9, and the light of signal spots 17,18,19 is photoelectric-converted in a lump. Through this consti tution, one record pit comes to be read three times successively as being delayed by the irradiation spots 14,15,16 and the photoelectric converting element 9, and if the light quantity is made variable respectively and independently by light quantity setting circuits 4,5,6, output level is made variable, and the trans versal filter can be constituted.
JP62239040A 1987-09-25 1987-09-25 Optical head device Expired - Fee Related JPH0778902B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62239040A JPH0778902B2 (en) 1987-09-25 1987-09-25 Optical head device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62239040A JPH0778902B2 (en) 1987-09-25 1987-09-25 Optical head device

Publications (2)

Publication Number Publication Date
JPS6484447A true JPS6484447A (en) 1989-03-29
JPH0778902B2 JPH0778902B2 (en) 1995-08-23

Family

ID=17038984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62239040A Expired - Fee Related JPH0778902B2 (en) 1987-09-25 1987-09-25 Optical head device

Country Status (1)

Country Link
JP (1) JPH0778902B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0536083A (en) * 1991-08-01 1993-02-12 Sharp Corp Optical recording and reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0536083A (en) * 1991-08-01 1993-02-12 Sharp Corp Optical recording and reproducing device

Also Published As

Publication number Publication date
JPH0778902B2 (en) 1995-08-23

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees