JPS55113170A - Record size detection circuit - Google Patents

Record size detection circuit

Info

Publication number
JPS55113170A
JPS55113170A JP1838079A JP1838079A JPS55113170A JP S55113170 A JPS55113170 A JP S55113170A JP 1838079 A JP1838079 A JP 1838079A JP 1838079 A JP1838079 A JP 1838079A JP S55113170 A JPS55113170 A JP S55113170A
Authority
JP
Japan
Prior art keywords
counting
photo
pulse
record
detection
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
JP1838079A
Other languages
Japanese (ja)
Inventor
Hiromichi Tanaka
Akihiro Asada
Osamu Imamura
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 claimed from JP18380A external-priority patent/JPS5594927A/en
Publication of JPS55113170A publication Critical patent/JPS55113170A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To improve record-size decision precision by a simple constitution by generating a photo-detection hole detecting/counting pulse at the rise and fall of a detection pulse for photo detection holes provided in a turntable. CONSTITUTION:Couples of photo detection holes 114-a to 114-c provided in turntable 101 are detected by photo detecting element 106, whose output is applied to differential rectifier circuit 310 and that connected to inverter 312 to generate a counting pulse at the rise and fall of a photo detection pulse through OR circuit 311, and counter 304 generates a record-size decision counting output. Therefore, the counting of counter 304 is carried out by double counting pulses and error decisionson the record size due to a wow and flutter, etc., are reduced.
JP1838079A 1980-01-07 1979-02-21 Record size detection circuit Pending JPS55113170A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18380A JPS5594927A (en) 1979-01-09 1980-01-07 Low molecular acrylate resin containing hydroxyl group and tertiary amino group

Publications (1)

Publication Number Publication Date
JPS55113170A true JPS55113170A (en) 1980-09-01

Family

ID=11466876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1838079A Pending JPS55113170A (en) 1980-01-07 1979-02-21 Record size detection circuit

Country Status (1)

Country Link
JP (1) JPS55113170A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575857A1 (en) * 1984-11-29 1986-07-11 Canon Kk Optical information storage apparatus
US5289451A (en) * 1984-11-29 1994-02-22 Canon Kabushiki Kaisha Optical information recording/reproduction apparatus including means for detecting the type of recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575857A1 (en) * 1984-11-29 1986-07-11 Canon Kk Optical information storage apparatus
US5289451A (en) * 1984-11-29 1994-02-22 Canon Kabushiki Kaisha Optical information recording/reproduction apparatus including means for detecting the type of recording medium

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