JPS56115077A - Laser recording device - Google Patents

Laser recording device

Info

Publication number
JPS56115077A
JPS56115077A JP1809280A JP1809280A JPS56115077A JP S56115077 A JPS56115077 A JP S56115077A JP 1809280 A JP1809280 A JP 1809280A JP 1809280 A JP1809280 A JP 1809280A JP S56115077 A JPS56115077 A JP S56115077A
Authority
JP
Japan
Prior art keywords
pulse
high frequency
picture signal
gates
converter
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
JP1809280A
Other languages
Japanese (ja)
Other versions
JPS643389B2 (en
Inventor
Hiroshi Ono
Masahiro Onishi
Shigenori Aisaka
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP1809280A priority Critical patent/JPS56115077A/en
Publication of JPS56115077A publication Critical patent/JPS56115077A/en
Publication of JPS643389B2 publication Critical patent/JPS643389B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]

Abstract

PURPOSE:To realize a recording of a picture having a rich half tone, by controlling one of several semiconductor lasers by the number of pulses or the pulse duration and according to the size of the input signal and thus delivering several tens of modulation levels by making use of the high frequency modulation characteristics. CONSTITUTION:The input picture signal 9 is amplified up to a prescribed level by the waveform shaping amplifier 10 and then applied to the A/D converter 11. The high frequency pulse 19 supplied from the high frequency oscillator 15 is divided by the divider 12 to produce the sampling pulse 20. The pulse 20 is then applied to the converter 11, digital value collating circuit 22 and counter 14 each. Then the concentration is decided by the comparator 30 for the picture signal sampled by the converter 11, and then the picture signal is applied to the gate 16. Then the signal corresponding to the concentration of the picture signal sent from the coincidence circuit 13 that detectes the coincidence of the outputs between the circuit 22 and the counter 14 is applied to the gates 16 and 16'. The pulse 19 given from the oscillator 15 is applied to the gates 16 and 16', and the semiconductor lasers 1 and 1' are controlled by the outputs of the gates 16 and 16'. Then the lasers 1 and 1' are modulated by the high frequency pulse.
JP1809280A 1980-02-15 1980-02-15 Laser recording device Granted JPS56115077A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1809280A JPS56115077A (en) 1980-02-15 1980-02-15 Laser recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1809280A JPS56115077A (en) 1980-02-15 1980-02-15 Laser recording device

Publications (2)

Publication Number Publication Date
JPS56115077A true JPS56115077A (en) 1981-09-10
JPS643389B2 JPS643389B2 (en) 1989-01-20

Family

ID=11961985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1809280A Granted JPS56115077A (en) 1980-02-15 1980-02-15 Laser recording device

Country Status (1)

Country Link
JP (1) JPS56115077A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4835781A (en) * 1987-02-25 1989-05-30 Fuji Photo Film Co., Ltd. Drooping elimination device for semiconductor laser
US4849980A (en) * 1986-12-29 1989-07-18 Fuji Photo Film Co., Ltd. Laser beam recording method and apparatus
US11698144B2 (en) 2021-01-15 2023-07-11 Swagelok Company Spring return valve handle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4849980A (en) * 1986-12-29 1989-07-18 Fuji Photo Film Co., Ltd. Laser beam recording method and apparatus
US4835781A (en) * 1987-02-25 1989-05-30 Fuji Photo Film Co., Ltd. Drooping elimination device for semiconductor laser
US11698144B2 (en) 2021-01-15 2023-07-11 Swagelok Company Spring return valve handle

Also Published As

Publication number Publication date
JPS643389B2 (en) 1989-01-20

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