JPS5482248A - Beam detection circuit for laser recorder - Google Patents
Beam detection circuit for laser recorderInfo
- Publication number
- JPS5482248A JPS5482248A JP14974277A JP14974277A JPS5482248A JP S5482248 A JPS5482248 A JP S5482248A JP 14974277 A JP14974277 A JP 14974277A JP 14974277 A JP14974277 A JP 14974277A JP S5482248 A JPS5482248 A JP S5482248A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- capacitor
- resistance
- output signal
- circuit
- 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
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To achieve the prevention of occurrence of errors, etc. by differentiating the output signal of a photoelectric transducer twice thereby detecting the central part.
CONSTITUTION: After the output signal (a) of the circuit consisting of a photoelectric transducer 6 and resistance R1 in a laser recorder is differentiated in a differentiation circuit consisting of a capacitor C1 and resistance R2, it is inversion amplified in an AC amplifier consisting of a capacitor C2 and amplifier A1 and is thereafter differentiated in a differentiation circuit consisting of capacitor C3 and resistance R3. After it is next inverted in an AC amplifier consisting of a capacitor C4 and amplifier A2, it is amplified with an AC amplifier consisting of a capacitor C5 and amplifier A3 to detect the central part, which is then clipped with a diode D1 and the component above a fixed voltage is drawn out and is subjected for waveform shaping in a Schmitt circuit A4. Then, even if the angle of inclination of a rotary polyhedral mirror 4 is not constant at each face, the output signal (e) becomes constant and modulation by picture signal is accomplished by letting the gate switch in a driving circuit 2 be turned ON.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14974277A JPS5482248A (en) | 1977-12-13 | 1977-12-13 | Beam detection circuit for laser recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14974277A JPS5482248A (en) | 1977-12-13 | 1977-12-13 | Beam detection circuit for laser recorder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5482248A true JPS5482248A (en) | 1979-06-30 |
Family
ID=15481785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14974277A Pending JPS5482248A (en) | 1977-12-13 | 1977-12-13 | Beam detection circuit for laser recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5482248A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6230212A (en) * | 1985-07-31 | 1987-02-09 | Copal Electron Co Ltd | Origin detector for optical scan |
JPS6392164A (en) * | 1986-10-07 | 1988-04-22 | Ricoh Co Ltd | Optical scanning device |
US5793036A (en) * | 1995-09-29 | 1998-08-11 | Asahi Kogaku Kogyo Kabushiki Kaisha | Synchronizing signal generating circuit for optical scanning device |
US5883657A (en) * | 1995-09-29 | 1999-03-16 | Asahi Kogaku Kogyo Kabushiki Kaisha | Synchronizing signal generating circuit for optical multiple-scanning device |
-
1977
- 1977-12-13 JP JP14974277A patent/JPS5482248A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6230212A (en) * | 1985-07-31 | 1987-02-09 | Copal Electron Co Ltd | Origin detector for optical scan |
JPS6392164A (en) * | 1986-10-07 | 1988-04-22 | Ricoh Co Ltd | Optical scanning device |
US5793036A (en) * | 1995-09-29 | 1998-08-11 | Asahi Kogaku Kogyo Kabushiki Kaisha | Synchronizing signal generating circuit for optical scanning device |
US5883657A (en) * | 1995-09-29 | 1999-03-16 | Asahi Kogaku Kogyo Kabushiki Kaisha | Synchronizing signal generating circuit for optical multiple-scanning device |
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