JPS572772A - Thermal recording method - Google Patents

Thermal recording method

Info

Publication number
JPS572772A
JPS572772A JP7606780A JP7606780A JPS572772A JP S572772 A JPS572772 A JP S572772A JP 7606780 A JP7606780 A JP 7606780A JP 7606780 A JP7606780 A JP 7606780A JP S572772 A JPS572772 A JP S572772A
Authority
JP
Japan
Prior art keywords
gradation
resolution
head
resolutions
thermal recording
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
JP7606780A
Other languages
Japanese (ja)
Inventor
Yukio Tokunaga
Kazunari Kubota
Yasuhisa Ikeda
Shigeki Ishii
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP7606780A priority Critical patent/JPS572772A/en
Publication of JPS572772A publication Critical patent/JPS572772A/en
Pending 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
    • H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper

Landscapes

  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To record an image having variations in both resolution and gradation by using a single head, by using a row of heatint elements in such a form as to provide a resolution equal to a natural number times of the least common multiple of resolutions for which the head is to be used in common, in a thermal recording method for recording a gradation image. CONSTITUTION:According to this invention, a thermal recording head 8 comprises a row of heating elements 7 which are arranged in accordance with the desired printing and in such form as to provide a resolution equal to m (m is a natural number larger than 1) times of the least common multiple of the resolutions for which the head 8 is to be used in common. When the highest of said resolutions is equal to the least common multiple of them, the elements 7 is so arranged as to provide a resolution equal to n (n is a natural number larger than 1) times of the highest resolution. In addition, a gradation recording is performed by combining a gradation presenting means based on 3-level density and that based on regulation of dot area factor. Accordingly, by using a single thermal recording head, images of different resolutions can be recorded and a gradation image having at least 5 gradation levels can be obtained stably and easily. The number of dots for one picture element is selected by a resolution selecting circuit 2 in accordance with the resolution, and a plurality of gradation patterns of the same gradation are selected by a gradation pattern generating circuit 3 using random numbers.
JP7606780A 1980-06-07 1980-06-07 Thermal recording method Pending JPS572772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7606780A JPS572772A (en) 1980-06-07 1980-06-07 Thermal recording method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7606780A JPS572772A (en) 1980-06-07 1980-06-07 Thermal recording method

Publications (1)

Publication Number Publication Date
JPS572772A true JPS572772A (en) 1982-01-08

Family

ID=13594425

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7606780A Pending JPS572772A (en) 1980-06-07 1980-06-07 Thermal recording method

Country Status (1)

Country Link
JP (1) JPS572772A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558330A (en) * 1983-11-14 1985-12-10 Victor Company Of Japan, Ltd. Thermal printing head
US4679055A (en) * 1983-07-28 1987-07-07 Fuji Xerox, Co., Ltd. Method and apparatus for thermal half-tone printing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4679055A (en) * 1983-07-28 1987-07-07 Fuji Xerox, Co., Ltd. Method and apparatus for thermal half-tone printing
US4558330A (en) * 1983-11-14 1985-12-10 Victor Company Of Japan, Ltd. Thermal printing head

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