JPS5453815A - Display unit for fluorescent lamp deterioration - Google Patents

Display unit for fluorescent lamp deterioration

Info

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
Application number
JP12064877A
Other languages
Japanese (ja)
Inventor
Masaru Kamimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12064877A priority Critical patent/JPS5453815A/en
Publication of JPS5453815A publication Critical patent/JPS5453815A/en
Pending legal-status Critical Current

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  • 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
JP12064877A 1977-10-06 1977-10-06 Display unit for fluorescent lamp deterioration Pending JPS5453815A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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