JPS54161763A - Lamp filament snapping detection circuit - Google Patents
Lamp filament snapping detection circuitInfo
- Publication number
- JPS54161763A JPS54161763A JP6996878A JP6996878A JPS54161763A JP S54161763 A JPS54161763 A JP S54161763A JP 6996878 A JP6996878 A JP 6996878A JP 6996878 A JP6996878 A JP 6996878A JP S54161763 A JPS54161763 A JP S54161763A
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- filament
- snapping
- potential
- turned
- 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
Abstract
PURPOSE: To enable the immediate detection of filament snapping of a lamp through a simple construction, by connecting dummy diodes and a resistor to a no-lamp part of a lamp matrix, detecting the abnormal potential of a current circuit and turning on an indicator lamp.
CONSTITUTION: When an indicator 1 for indicating a turned-on lamp shows "0, 1, 1, 0", transistors Qb, Qf along axes X, Y are turned on through decoders 2a, 2b to supply an electrical current to the lamp LD22 connected at an intersection as to the axes X, Y to turn on the lamp. If the filament of the lamp snaps, the potential on the plus input of a sense amplifier 4 rises. Therefore, the potential is compared with a reference potential VREF. If the potential is higher than the reference potential, a lamp filament snapping flag 5 is set and a light emitting diode LDa for indicating the snapping of the lamp filament is turned on by a driver 6. A series circuit consisting of the dummy diodes D11, D43, D44 and the resistor r is coupled to each intersection with no lamp to distinguish between the filament snapping of the lamp and its absence.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6996878A JPS54161763A (en) | 1978-06-10 | 1978-06-10 | Lamp filament snapping detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6996878A JPS54161763A (en) | 1978-06-10 | 1978-06-10 | Lamp filament snapping detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54161763A true JPS54161763A (en) | 1979-12-21 |
Family
ID=13417951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6996878A Pending JPS54161763A (en) | 1978-06-10 | 1978-06-10 | Lamp filament snapping detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54161763A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5787094A (en) * | 1980-09-17 | 1982-05-31 | Aerospatiale | Device for inspecting plural indicator lamps |
-
1978
- 1978-06-10 JP JP6996878A patent/JPS54161763A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5787094A (en) * | 1980-09-17 | 1982-05-31 | Aerospatiale | Device for inspecting plural indicator lamps |
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