JPS5611627A - Optical reproducing unit - Google Patents

Optical reproducing unit

Info

Publication number
JPS5611627A
JPS5611627A JP8452479A JP8452479A JPS5611627A JP S5611627 A JPS5611627 A JP S5611627A JP 8452479 A JP8452479 A JP 8452479A JP 8452479 A JP8452479 A JP 8452479A JP S5611627 A JPS5611627 A JP S5611627A
Authority
JP
Japan
Prior art keywords
signal
nand circuit
optical beam
output
recording groove
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
JP8452479A
Other languages
Japanese (ja)
Inventor
Shinichi Tanaka
Ikuo Matsuda
Tsuneo Hirose
Kazuji Kobayashi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8452479A priority Critical patent/JPS5611627A/en
Publication of JPS5611627A publication Critical patent/JPS5611627A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To simplify the constitution, by scanning the information recording groove with optical beam via the oscillating mirror in sinusoidal wave oscillation, detecting the reflection light beam moving backward to the incident optical beam, converting the PPM modulation output signal into PWM modulation signal, and reproducing the information through PWM demodulation.
CONSTITUTION: The oscillation mirror 11 is oscillated with sufficiently greater amplitude through the drive signal fs of the signal generator 10, and the information recording groove is scanned with optical beam via the half mirror. The drive signal inputs the signal (g) to the NAND circuit 23 via the phase unit 12, rectifying circuit 13 and Schmitt trigger 14. The optical pulse signal from the recording groove transmits the half mirror and it is detected at the photoelectric detection 16, and it is taken for the logical product with the output of the Schmitt trigger 19 at the NAND circuit 21 via the amplifier 17, differentiating unit 18 and comparator 20, noise is removed, the output (g) is the signal i via FF2, it is taken for the logical product with the signal j at the NAND circuit 23 and PWM demodulation is made via the low-pass filter 24 to obtain the reproduction signal.
COPYRIGHT: (C)1981,JPO&Japio
JP8452479A 1979-07-03 1979-07-03 Optical reproducing unit Pending JPS5611627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8452479A JPS5611627A (en) 1979-07-03 1979-07-03 Optical reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8452479A JPS5611627A (en) 1979-07-03 1979-07-03 Optical reproducing unit

Publications (1)

Publication Number Publication Date
JPS5611627A true JPS5611627A (en) 1981-02-05

Family

ID=13833020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8452479A Pending JPS5611627A (en) 1979-07-03 1979-07-03 Optical reproducing unit

Country Status (1)

Country Link
JP (1) JPS5611627A (en)

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