JPS57171877A - Detecting device for degradation of light source in facsimile device - Google Patents
Detecting device for degradation of light source in facsimile deviceInfo
- Publication number
- JPS57171877A JPS57171877A JP56056216A JP5621681A JPS57171877A JP S57171877 A JPS57171877 A JP S57171877A JP 56056216 A JP56056216 A JP 56056216A JP 5621681 A JP5621681 A JP 5621681A JP S57171877 A JPS57171877 A JP S57171877A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- reference white
- original
- white
- degradation
- 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
- H04N1/40—Picture signal circuits
- H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE:To detect the degradation of a light source, by providing a reference white outside the original read region and in the read range of a picture reading element and comparing the output of the picture reading element for this reference white with a reference value. CONSTITUTION:A reference white 14 is fixed in a prescribed position outside the original read range and in the read range of a photoelectric transducer. The reference white has a quantity of reflection light equal to or more than that of the white ground of an oridinary paper for a light source 11 which illuminates an original 10. Reflection lights from the original 10 and the reference white 14 illuminated by the light source 11 are reflected by a mirror 13 and are incident to the photoelectric transducer. The signal from the reference white 14 is held in a peak holding circuit and is displayed. The secular change of the peak holding voltage is compared with a reference voltage to monitor the brightness of the light source 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56056216A JPS57171877A (en) | 1981-04-16 | 1981-04-16 | Detecting device for degradation of light source in facsimile device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56056216A JPS57171877A (en) | 1981-04-16 | 1981-04-16 | Detecting device for degradation of light source in facsimile device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57171877A true JPS57171877A (en) | 1982-10-22 |
Family
ID=13020902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56056216A Pending JPS57171877A (en) | 1981-04-16 | 1981-04-16 | Detecting device for degradation of light source in facsimile device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57171877A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043962A (en) * | 1983-08-20 | 1985-03-08 | Usac Electronics Ind Co Ltd | System for detecting lowering of light quantity of image reader |
| JPS6264063U (en) * | 1985-10-14 | 1987-04-21 | ||
| JPS62118672A (en) * | 1985-11-19 | 1987-05-30 | Konishiroku Photo Ind Co Ltd | Picture reader |
| JPS62188862U (en) * | 1986-05-20 | 1987-12-01 | ||
| JPS6477269A (en) * | 1987-09-18 | 1989-03-23 | Hitachi Ltd | Light quantity checking method for picture reader |
-
1981
- 1981-04-16 JP JP56056216A patent/JPS57171877A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043962A (en) * | 1983-08-20 | 1985-03-08 | Usac Electronics Ind Co Ltd | System for detecting lowering of light quantity of image reader |
| JPH0326591B2 (en) * | 1983-08-20 | 1991-04-11 | Pfu Ltd | |
| JPS6264063U (en) * | 1985-10-14 | 1987-04-21 | ||
| JPS62118672A (en) * | 1985-11-19 | 1987-05-30 | Konishiroku Photo Ind Co Ltd | Picture reader |
| JPS62188862U (en) * | 1986-05-20 | 1987-12-01 | ||
| JPS6477269A (en) * | 1987-09-18 | 1989-03-23 | Hitachi Ltd | Light quantity checking method for picture reader |
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