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JPS5681990A - Edge intensifying device - Google Patents

Edge intensifying device

Info

Publication number
JPS5681990A
JPS5681990A JP15856279A JP15856279A JPS5681990A JP S5681990 A JPS5681990 A JP S5681990A JP 15856279 A JP15856279 A JP 15856279A JP 15856279 A JP15856279 A JP 15856279A JP S5681990 A JPS5681990 A JP S5681990A
Authority
JP
Japan
Prior art keywords
laser
edge
medium
transistors
transistor
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
JP15856279A
Other languages
Japanese (ja)
Other versions
JPS6359276B2 (en
Inventor
Yukio Sato
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP15856279A priority Critical patent/JPS5681990A/en
Publication of JPS5681990A publication Critical patent/JPS5681990A/en
Publication of JPS6359276B2 publication Critical patent/JPS6359276B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To clearly reproduce a fine line or the like in a device for digitally modulating and recording a laser beam by intensifying only the laser modulation current at the edge of a digital signal. CONSTITUTION:Laser beam from a laser oscillator is irradiated to the surface of a photosensitive drum as a photosensitive medium, and a latent image is formed on the medium. When the beam is repeated in oscillation and stoppage using the digital signal, the spot of the beam becomes smooth at the periphery of the signal and accordingly similarly becomes smooth at the medium. The device circuit is composed of a laser modulator circuit 3, a phase shifter 4, an exclusive OR gate 5, a semiconductor laser LD, and transistors Q1, Q2. Thus, the output of the laser LD is modulated at the transistor Q1, is superimposed at the transistor Q2, thereby increasing the laser drive current at the edge larger than the part except the edge. The resistors R1, R2 at the collectors of the transistors Q1, Q2 are set by R1>>R2.
JP15856279A 1979-12-06 1979-12-06 Edge intensifying device Granted JPS5681990A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15856279A JPS5681990A (en) 1979-12-06 1979-12-06 Edge intensifying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15856279A JPS5681990A (en) 1979-12-06 1979-12-06 Edge intensifying device

Publications (2)

Publication Number Publication Date
JPS5681990A true JPS5681990A (en) 1981-07-04
JPS6359276B2 JPS6359276B2 (en) 1988-11-18

Family

ID=15674407

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15856279A Granted JPS5681990A (en) 1979-12-06 1979-12-06 Edge intensifying device

Country Status (1)

Country Link
JP (1) JPS5681990A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891474A (en) * 1981-11-27 1983-05-31 Konishiroku Photo Ind Co Ltd Semiconductor laser driver
US4878068A (en) * 1986-09-08 1989-10-31 Canon Kabushiki Kaisha Beam recorder having a varying beam intensity for maintaining a true reproduced image
US4905023A (en) * 1986-11-14 1990-02-27 Canon Kabushiki Kaisha Image forming apparatus including digital image signal input means
US4965747A (en) * 1988-05-10 1990-10-23 Canon Kabushiki Kaisha Image forming apparatus
JP2006237092A (en) * 2005-02-23 2006-09-07 Nec Corp Laser diode modulator and modulation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52144289A (en) * 1976-05-27 1977-12-01 Fujitsu Ltd Circuit for driving semiconductor laser
JPS5356985A (en) * 1976-11-02 1978-05-23 Fujitsu Ltd Light emitting element driving circuit
JPS53116791A (en) * 1977-03-23 1978-10-12 Toshiba Corp Driving circuit of semiconductor light emitting element

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52144289A (en) * 1976-05-27 1977-12-01 Fujitsu Ltd Circuit for driving semiconductor laser
JPS5356985A (en) * 1976-11-02 1978-05-23 Fujitsu Ltd Light emitting element driving circuit
JPS53116791A (en) * 1977-03-23 1978-10-12 Toshiba Corp Driving circuit of semiconductor light emitting element

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891474A (en) * 1981-11-27 1983-05-31 Konishiroku Photo Ind Co Ltd Semiconductor laser driver
US4878068A (en) * 1986-09-08 1989-10-31 Canon Kabushiki Kaisha Beam recorder having a varying beam intensity for maintaining a true reproduced image
US4905023A (en) * 1986-11-14 1990-02-27 Canon Kabushiki Kaisha Image forming apparatus including digital image signal input means
US4965747A (en) * 1988-05-10 1990-10-23 Canon Kabushiki Kaisha Image forming apparatus
JP2006237092A (en) * 2005-02-23 2006-09-07 Nec Corp Laser diode modulator and modulation method thereof

Also Published As

Publication number Publication date
JPS6359276B2 (en) 1988-11-18

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