JPS5611627A - Optical reproducing unit - Google Patents
Optical reproducing unitInfo
- 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
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
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) |
-
1979
- 1979-07-03 JP JP8452479A patent/JPS5611627A/en active Pending
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