GB1482522A - Exposing scanners for image reproduction - Google Patents
Exposing scanners for image reproductionInfo
- Publication number
- GB1482522A GB1482522A GB4598973A GB4598973A GB1482522A GB 1482522 A GB1482522 A GB 1482522A GB 4598973 A GB4598973 A GB 4598973A GB 4598973 A GB4598973 A GB 4598973A GB 1482522 A GB1482522 A GB 1482522A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diode
- signal
- light
- screen
- facsimile
- 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
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
- H04N1/40081—Soft dot halftoning, i.e. producing halftone dots with gradual edges
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Abstract
1482522 Facsimile CROSFIELD ELECTRONICS Ltd 19 Sept 1974 [2 Oct 1973] 45989/73 Heading H4F A facsimile exposing scanner includes a row of light sources 8, Fig. 1, illuminating side-byside areas of a record medium 4 and includes control signal generating means connected to receive a common image representing signal and controlling discretely the intensities of light from the sources at the surface of medium 4. The light forms a strip spanning a single scan line on the record medium, so that half tone image dots may be formed during the scanning motion. The light emitting diodes 8 are operable at a plurality of discrete energy levels allowing an intensity profile, across a dot, of the form shown in Fig. 3(c). This is achieved by the inclusion of at least one gradation circuit 13 having an input/output characteristic of the form shown in Fig. 4. A common image representing signal is compared for each diode 8 with a screen signal from a screen pattern generator 14. If the ratio between these signals exceeds a first predetermined value the diode is energized to a first low level. One or more graded versions of the common signal are also compared with the screen signal appropriate to the diode and if this ratio exceeds a second or subsequent predetermined value the diode is further energized to a second or subsequent higher level. In this manner the degree of etching control is improved.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4598973A GB1482522A (en) | 1973-10-02 | 1973-10-02 | Exposing scanners for image reproduction |
| DE19742446427 DE2446427A1 (en) | 1973-10-02 | 1974-09-28 | EXPOSURE SCANNER FOR IMAGE REPRODUCTION |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4598973A GB1482522A (en) | 1973-10-02 | 1973-10-02 | Exposing scanners for image reproduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1482522A true GB1482522A (en) | 1977-08-10 |
Family
ID=10439386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4598973A Expired GB1482522A (en) | 1973-10-02 | 1973-10-02 | Exposing scanners for image reproduction |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2446427A1 (en) |
| GB (1) | GB1482522A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0047145A2 (en) * | 1980-09-01 | 1982-03-10 | Crosfield Electronics Limited | A method of producing a half-tone reproduction |
| US4468706A (en) * | 1979-02-13 | 1984-08-28 | Coulter Systems Corporation | Imaging by varying the placement of elements in the pixels |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120937A (en) * | 1981-01-21 | 1982-07-28 | Dainippon Screen Mfg Co Ltd | Formation of halftone plate image |
| JPS5978353A (en) * | 1982-10-28 | 1984-05-07 | Dainippon Screen Mfg Co Ltd | Dot forming method of mesh plate picture recording device |
| US5440360A (en) * | 1988-12-12 | 1995-08-08 | Prio Corporation | Reflective stimulus for computer screen simulation for eye examinations |
-
1973
- 1973-10-02 GB GB4598973A patent/GB1482522A/en not_active Expired
-
1974
- 1974-09-28 DE DE19742446427 patent/DE2446427A1/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4468706A (en) * | 1979-02-13 | 1984-08-28 | Coulter Systems Corporation | Imaging by varying the placement of elements in the pixels |
| EP0047145A2 (en) * | 1980-09-01 | 1982-03-10 | Crosfield Electronics Limited | A method of producing a half-tone reproduction |
| EP0047145A3 (en) * | 1980-09-01 | 1984-12-19 | Crosfield Electronics Limited | A method of producing a half-tone reproduction |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2446427A1 (en) | 1975-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19940918 |