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JPS57123567A - Detector for non-signal recording part of record disk - Google Patents

Detector for non-signal recording part of record disk

Info

Publication number
JPS57123567A
JPS57123567A JP937181A JP937181A JPS57123567A JP S57123567 A JPS57123567 A JP S57123567A JP 937181 A JP937181 A JP 937181A JP 937181 A JP937181 A JP 937181A JP S57123567 A JPS57123567 A JP S57123567A
Authority
JP
Japan
Prior art keywords
output
signal recording
record disk
photodetecting element
recording part
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
JP937181A
Other languages
Japanese (ja)
Inventor
Masahisa Goto
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 JP937181A priority Critical patent/JPS57123567A/en
Publication of JPS57123567A publication Critical patent/JPS57123567A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect the non-signal recording parts of various record disks securely by automatically controlling DC level of the output of a photodetecting element.
CONSTITUTION: A record disk 5 is irradiated with optical beam from a light emitting element 1 and reflected optical beam from the record disk 5 is received by a photodetecting element 2 to detect the non-signal recording part of the record disk 5 on the basis of variation in photodetection output. In this case, integrating, inverting and amplifying circuits 29 and 30 are connected to the output terminal of the photodetecting element 2, whose output is integrated, inverted and amplified to control DC output level of the photodetecting element 2 by the output of said processing.
COPYRIGHT: (C)1982,JPO&Japio
JP937181A 1981-01-23 1981-01-23 Detector for non-signal recording part of record disk Pending JPS57123567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP937181A JPS57123567A (en) 1981-01-23 1981-01-23 Detector for non-signal recording part of record disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP937181A JPS57123567A (en) 1981-01-23 1981-01-23 Detector for non-signal recording part of record disk

Publications (1)

Publication Number Publication Date
JPS57123567A true JPS57123567A (en) 1982-08-02

Family

ID=11718605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP937181A Pending JPS57123567A (en) 1981-01-23 1981-01-23 Detector for non-signal recording part of record disk

Country Status (1)

Country Link
JP (1) JPS57123567A (en)

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