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GB1451082A - Exposing scanners for image reproduction - Google Patents

Exposing scanners for image reproduction

Info

Publication number
GB1451082A
GB1451082A GB4598873A GB4598873A GB1451082A GB 1451082 A GB1451082 A GB 1451082A GB 4598873 A GB4598873 A GB 4598873A GB 4598873 A GB4598873 A GB 4598873A GB 1451082 A GB1451082 A GB 1451082A
Authority
GB
United Kingdom
Prior art keywords
diodes
intensity
emitting diodes
light
response
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.)
Expired
Application number
GB4598873A
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.)
Crosfield Electronics Ltd
Original Assignee
Crosfield Electronics 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 Crosfield Electronics Ltd filed Critical Crosfield Electronics Ltd
Priority to GB4598873A priority Critical patent/GB1451082A/en
Priority to DE19742446435 priority patent/DE2446435C2/en
Publication of GB1451082A publication Critical patent/GB1451082A/en
Expired 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
    • H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales
    • H04N1/40031—Circuits exciting or modulating particular heads for reproducing continuous tone value scales for a plurality of reproducing elements simultaneously
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Color, Gradation (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Heads (AREA)

Abstract

1451082 An exposing scanner CROSFIELD ELECTRONICS Ltd 16 Sept 1974 [2 Oct 1973] 45988/73 Heading H4F An exposing scanner for reproducing images on light sensitive paper 4 comprises a revolving drum 5 for mounting the paper and a scanning head 6 mounted on a lead screw 7. The head 6 comprises a row of light emitting diodes 8 which produce a strip of light on the paper 4 the light intensity of the diodes being uniformly varied in response to a common input signal. The common input signals come from a conventional input scanner 9 and are received and amplified by an amplifier 10. A current control unit 11 containing respective control circuits for each diode permits the response of the diode to be adjusted to provide uniform intensity across the line or any required intensity profile. The control circuit for producing continuous tone images by uniformly varied intensity of the diodes in response to the common input signal. is described with reference to Fig. 2 (not shown) and that for producing half tone images constructed of dots of varying intensity produced by switching some or all the diodes on or off in Fig. 3 (not shown). The light emitting diodes may be of the gallium arsenide or gallium phosphide type. Red emitting diodes may be used with panchromatic film and green emitting diodes may be used with orthochromatic film. The optical system may include an aperture to define the size of the spot.
GB4598873A 1973-10-02 1973-10-02 Exposing scanners for image reproduction Expired GB1451082A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4598873A GB1451082A (en) 1973-10-02 1973-10-02 Exposing scanners for image reproduction
DE19742446435 DE2446435C2 (en) 1973-10-02 1974-09-28 Circuit arrangement for setting the intensity of several light sources arranged next to one another in an image reproduction device for rasterized reproduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4598873A GB1451082A (en) 1973-10-02 1973-10-02 Exposing scanners for image reproduction

Publications (1)

Publication Number Publication Date
GB1451082A true GB1451082A (en) 1976-09-29

Family

ID=10439379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4598873A Expired GB1451082A (en) 1973-10-02 1973-10-02 Exposing scanners for image reproduction

Country Status (2)

Country Link
DE (1) DE2446435C2 (en)
GB (1) GB1451082A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005956A1 (en) * 1980-02-16 1981-09-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Integrated circuit LED display - has diodes grouped into regions with shared electrode

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074319A (en) * 1976-12-13 1978-02-14 Bell Telephone Laboratories, Incorporated Light emitting diode array imaging system - parallel approach
DE2938224A1 (en) * 1979-09-21 1981-04-09 Siemens AG, 1000 Berlin und 8000 München OPTICAL DEVICE FOR CONTACTLESS WRITING
DE2938301A1 (en) * 1979-09-21 1981-04-09 Siemens AG, 1000 Berlin und 8000 München OPTICAL DEVICE FOR CONTACTLESS WRITING, IN PARTICULAR FOR FACSIMILE RETURN OF IMAGES AND TEXT
US4476474A (en) * 1981-04-02 1984-10-09 Canon Kabushiki Kaisha Dot recording apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2323222A1 (en) * 1973-05-09 1974-11-14 Hoh & Hahne Hohlux Gmbh METHOD AND DEVICE FOR THE ELECTROOPTICAL REPRODUCTION OF HALFTONE IMAGES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005956A1 (en) * 1980-02-16 1981-09-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Integrated circuit LED display - has diodes grouped into regions with shared electrode

Also Published As

Publication number Publication date
DE2446435A1 (en) 1975-04-10
DE2446435C2 (en) 1984-09-06

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940915