JPS5482248A - Beam detection circuit for laser recorder - Google Patents

Beam detection circuit for laser recorder

Info

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
Application number
JP14974277A
Other languages
Japanese (ja)
Inventor
Masaaki Mori
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14974277A priority Critical patent/JPS5482248A/en
Publication of JPS5482248A publication Critical patent/JPS5482248A/en
Pending legal-status Critical Current

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
JP14974277A 1977-12-13 1977-12-13 Beam detection circuit for laser recorder Pending JPS5482248A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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