JPS5676678A - Exposure light for video reader - Google Patents
Exposure light for video readerInfo
- Publication number
- JPS5676678A JPS5676678A JP15383779A JP15383779A JPS5676678A JP S5676678 A JPS5676678 A JP S5676678A JP 15383779 A JP15383779 A JP 15383779A JP 15383779 A JP15383779 A JP 15383779A JP S5676678 A JPS5676678 A JP S5676678A
- Authority
- JP
- Japan
- Prior art keywords
- size
- terminal
- trigger circuit
- exposure
- exposure light
- 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
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
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE:To avoid the useless energy of exposure light source, by giving lighting only required width in matching with the size of original. CONSTITUTION:The length of a filament 11 of an exposure lamp 10 is taken sufficient to cover the short side of A-3 size. At the position to cover the short side of B-4 size, an intermediate terminal 12m is installed. The first bidirectional thyristor 131 is connected to the terminal 122, and the 2nd thyristor 132 is connected to the intermediate terminal 12m, and they are connected with the 1st trigger circuit 171 and the 2nd trigger circuit 172 respectively. With this constitution, when the original is B-4 size, and ''1'' is given to the 1 input of the AND gate 162, the trigger circuit 172 turns on the 2nd thuristor 132 and gives AC power supply between the terminal 121 and the intermediate terminal 12m to illuminate the exposure lamp 10 for the part corresponding to the width of B-4 size. Thus, the exposure to unnecessary part is not required to save the energy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15383779A JPS5676678A (en) | 1979-11-28 | 1979-11-28 | Exposure light for video reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15383779A JPS5676678A (en) | 1979-11-28 | 1979-11-28 | Exposure light for video reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5676678A true JPS5676678A (en) | 1981-06-24 |
Family
ID=15571171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15383779A Pending JPS5676678A (en) | 1979-11-28 | 1979-11-28 | Exposure light for video reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5676678A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58169142A (en) * | 1982-03-25 | 1983-10-05 | ジー・ティー・イー・プロダクツ・コーポレイション | Copying machine lamp with two lengthes |
JPS6352567A (en) * | 1986-08-22 | 1988-03-05 | Canon Inc | Picture reader |
US4954891A (en) * | 1988-07-11 | 1990-09-04 | Process Automation Business, Inc. | Light guided illuminating/sectioning device for sheet inspection system |
US5726774A (en) * | 1994-06-17 | 1998-03-10 | Canon Kabushiki Kaisha | Document reading device with light-shielding member that prevents a local temperature increase in a document placing table |
-
1979
- 1979-11-28 JP JP15383779A patent/JPS5676678A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58169142A (en) * | 1982-03-25 | 1983-10-05 | ジー・ティー・イー・プロダクツ・コーポレイション | Copying machine lamp with two lengthes |
JPS6352567A (en) * | 1986-08-22 | 1988-03-05 | Canon Inc | Picture reader |
US4954891A (en) * | 1988-07-11 | 1990-09-04 | Process Automation Business, Inc. | Light guided illuminating/sectioning device for sheet inspection system |
US5726774A (en) * | 1994-06-17 | 1998-03-10 | Canon Kabushiki Kaisha | Document reading device with light-shielding member that prevents a local temperature increase in a document placing table |
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