JPS5453815A - Display unit for fluorescent lamp deterioration - Google Patents
Display unit for fluorescent lamp deteriorationInfo
- Publication number
- JPS5453815A JPS5453815A JP12064877A JP12064877A JPS5453815A JP S5453815 A JPS5453815 A JP S5453815A JP 12064877 A JP12064877 A JP 12064877A JP 12064877 A JP12064877 A JP 12064877A JP S5453815 A JPS5453815 A JP S5453815A
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent lamp
- output
- deterioration
- subjected
- reference voltage
- 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
Landscapes
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To prevent the deterioration of output picture signals by detecting automatically the deterioration of a fluorescent lamp by using a photo diode array in facsimile, etc.
CONSTITUTION: Before manuscript 4 reaches read slit 5, the irradiating light of fluorescent lamp 1 is reflected from a white plate having a uniform background of slit 5 and is condensed onto photo diode array 3. Then, the output signal is obtained as a picture signal voltage at the center of each scanning period through analogue switches 8A and 8B, capacities 10A and 10B and buffer amplifiers 11A and 11B after being subjected to sample hold in 8. The output of amplifier 11A is compared with the fluorescent lamp deterioration reference voltage by 12A, and meanwhile, the output of both amplifiers is subjected to subtraction in 14 and addition in 15, and the output is compared with the fluorescent lamp deterioration reference voltage by 12B. Then, NOR is operated in 16 by both comparison outputs, so that lamp 1 can be decided to be deteriorated when LED 17 is lit
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12064877A JPS5453815A (en) | 1977-10-06 | 1977-10-06 | Display unit for fluorescent lamp deterioration |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12064877A JPS5453815A (en) | 1977-10-06 | 1977-10-06 | Display unit for fluorescent lamp deterioration |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5453815A true JPS5453815A (en) | 1979-04-27 |
Family
ID=14791418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12064877A Pending JPS5453815A (en) | 1977-10-06 | 1977-10-06 | Display unit for fluorescent lamp deterioration |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5453815A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4760465A (en) * | 1984-11-29 | 1988-07-26 | Ricoh Company, Ltd. | Electronic blackboard which detects an abnormal operating condition by reading a non-image section of a writing surface at power-up |
-
1977
- 1977-10-06 JP JP12064877A patent/JPS5453815A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4760465A (en) * | 1984-11-29 | 1988-07-26 | Ricoh Company, Ltd. | Electronic blackboard which detects an abnormal operating condition by reading a non-image section of a writing surface at power-up |
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