JPS5548869A - Detection circuit for record size - Google Patents

Detection circuit for record size

Info

Publication number
JPS5548869A
JPS5548869A JP12153678A JP12153678A JPS5548869A JP S5548869 A JPS5548869 A JP S5548869A JP 12153678 A JP12153678 A JP 12153678A JP 12153678 A JP12153678 A JP 12153678A JP S5548869 A JPS5548869 A JP S5548869A
Authority
JP
Japan
Prior art keywords
counter
signal
record size
time point
turntable
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
JP12153678A
Other languages
Japanese (ja)
Other versions
JPS6235178B2 (en
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 to JP12153678A priority Critical patent/JPS5548869A/en
Publication of JPS5548869A publication Critical patent/JPS5548869A/en
Publication of JPS6235178B2 publication Critical patent/JPS6235178B2/ja
Granted 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
    • G11B19/124—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving the detection of diameter of disks

Abstract

PURPOSE:To prevent the mis-detection of record size due to wow and flutter, by constituting the circuit with logic IC and converting the serial record size signal into parallel signal. CONSTITUTION:When the photo electric conversion signal 302 is inputted and the level is changed at the time point a in Fig. from L to H, the switch 310-a is closed, and the counter 303 receives the turn control signal 301 and starts the count from the time point e. Further, the counter 304 starts count from the time point b. When the counter 303 counts the number of pulses N taking one revolution of the turntable as one period, it is self-reset and the signal of the output 306 of the counter 304 is at latch output. Simultaneously, the counter 304 is reset. Since the counter start time of the counters 304 and 303 has time difference by almost the pulse width of photo electric conversion pulse of the serial electric signal 302, the malfunction to the period variation of turntable is avoided.
JP12153678A 1978-10-04 1978-10-04 Detection circuit for record size Granted JPS5548869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12153678A JPS5548869A (en) 1978-10-04 1978-10-04 Detection circuit for record size

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12153678A JPS5548869A (en) 1978-10-04 1978-10-04 Detection circuit for record size

Publications (2)

Publication Number Publication Date
JPS5548869A true JPS5548869A (en) 1980-04-08
JPS6235178B2 JPS6235178B2 (en) 1987-07-31

Family

ID=14813666

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12153678A Granted JPS5548869A (en) 1978-10-04 1978-10-04 Detection circuit for record size

Country Status (1)

Country Link
JP (1) JPS5548869A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58132584U (en) * 1982-03-02 1983-09-07 石川島播磨重工業株式会社 desalination equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58132584U (en) * 1982-03-02 1983-09-07 石川島播磨重工業株式会社 desalination equipment

Also Published As

Publication number Publication date
JPS6235178B2 (en) 1987-07-31

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