JPS57130064A - Picture recorder - Google Patents
Picture recorderInfo
- Publication number
- JPS57130064A JPS57130064A JP56017092A JP1709281A JPS57130064A JP S57130064 A JPS57130064 A JP S57130064A JP 56017092 A JP56017092 A JP 56017092A JP 1709281 A JP1709281 A JP 1709281A JP S57130064 A JPS57130064 A JP S57130064A
- Authority
- JP
- Japan
- Prior art keywords
- picture element
- lda
- time
- laser diodes
- tone
- 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
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]
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Fax Reproducing Arrangements (AREA)
Abstract
PURPOSE:To ensure the stabilized recording of a half-tone picture, by varying the conducting time of a semiconductor laser diode LDA or the conducting time and the number of laser diodes constituting the LDA and having the emission of light. CONSTITUTION:The (n) units of laser diodes constituting an LDA5 are all simultaneously made to conduct for a time of tp=p/16 while a scan is carried out in the main scanning direction. While the conduction is discontinued for these laser diodes for the rest time of p-p/16. Thus p/16 and p-p/16 are identical to the bright and dark parts respectively to obtain a relative half-tone picture element having an effective product of 1/16 unit picture element XAXXB. Thereafter, the conducting time (tp) is varied as tp=p/8, p/2 and (p) to modulate the area with every unit picture element. As a result, a relative half-tone picture element is obtained. In such way, the light of an LDA received an area modulation with every unit picture element is projected on a photoreceptor and then converted into an electric charge image to carry out the toner development, transcription and heating fixing. Thus a stabilized half-tone picture can be recorded on the ordinary paper.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56017092A JPS57130064A (en) | 1981-02-06 | 1981-02-06 | Picture recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56017092A JPS57130064A (en) | 1981-02-06 | 1981-02-06 | Picture recorder |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18365192A Division JPH0691931A (en) | 1992-07-10 | 1992-07-10 | Image recording device |
JP21034993A Division JPH0723007B2 (en) | 1993-08-25 | 1993-08-25 | Image recorder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57130064A true JPS57130064A (en) | 1982-08-12 |
JPH0470635B2 JPH0470635B2 (en) | 1992-11-11 |
Family
ID=11934340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56017092A Granted JPS57130064A (en) | 1981-02-06 | 1981-02-06 | Picture recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57130064A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59188271A (en) * | 1983-04-11 | 1984-10-25 | Konishiroku Photo Ind Co Ltd | Beam scanning type printer |
JPS6021260A (en) * | 1983-07-15 | 1985-02-02 | Nippon Telegr & Teleph Corp <Ntt> | Gradation recording system |
JPS6349463A (en) * | 1986-08-19 | 1988-03-02 | Fujitsu Ltd | Gradation recorder |
JP2009061643A (en) * | 2007-09-05 | 2009-03-26 | Casio Comput Co Ltd | Exposure device and image forming apparatus |
US7898562B2 (en) | 2007-09-05 | 2011-03-01 | Casio Computer Co., Ltd. | Exposing device and image forming apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4925811A (en) * | 1972-04-05 | 1974-03-07 | ||
JPS5234739A (en) * | 1975-09-12 | 1977-03-16 | Hitachi Ltd | Light printer |
-
1981
- 1981-02-06 JP JP56017092A patent/JPS57130064A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4925811A (en) * | 1972-04-05 | 1974-03-07 | ||
JPS5234739A (en) * | 1975-09-12 | 1977-03-16 | Hitachi Ltd | Light printer |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59188271A (en) * | 1983-04-11 | 1984-10-25 | Konishiroku Photo Ind Co Ltd | Beam scanning type printer |
JPS6021260A (en) * | 1983-07-15 | 1985-02-02 | Nippon Telegr & Teleph Corp <Ntt> | Gradation recording system |
JPS6349463A (en) * | 1986-08-19 | 1988-03-02 | Fujitsu Ltd | Gradation recorder |
JP2009061643A (en) * | 2007-09-05 | 2009-03-26 | Casio Comput Co Ltd | Exposure device and image forming apparatus |
JP4548462B2 (en) * | 2007-09-05 | 2010-09-22 | カシオ計算機株式会社 | Exposure apparatus and image forming apparatus |
US7898562B2 (en) | 2007-09-05 | 2011-03-01 | Casio Computer Co., Ltd. | Exposing device and image forming apparatus |
US8199182B2 (en) | 2007-09-05 | 2012-06-12 | Casio Computer Co., Ltd. | Exposing device and image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0470635B2 (en) | 1992-11-11 |
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