JPS57172837A - Control device for car lamp - Google Patents
Control device for car lampInfo
- Publication number
- JPS57172837A JPS57172837A JP56055115A JP5511581A JPS57172837A JP S57172837 A JPS57172837 A JP S57172837A JP 56055115 A JP56055115 A JP 56055115A JP 5511581 A JP5511581 A JP 5511581A JP S57172837 A JPS57172837 A JP S57172837A
- Authority
- JP
- Japan
- Prior art keywords
- output
- turned
- circuit
- lamp
- switch
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1415—Dimming circuits
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
PURPOSE:To suppress rush current likely to occur at the time of a switch being turned on and thereby prevent the filament from being blowing, by such a circuit configuration that the lamp is lighted with its illuminance increasing gradually actuated by the switch being turned on. CONSTITUTION:If a switch SW is turned on to light up the lamp L, a constant voltage given through a constant-voltage diode ZD1 is impressd to polarity inverting circuits IC1, IC2 through a filter circuit 5 to allow an L level output to be emitted out of the circuits IC1, IC2. Then the output from a positive sawtooth wave generator circuit 4 will become at H level after a certain while depending upon the time constant to be determined by the capacitor C4 and resistance R7. This output is compared with the one out of a saw-tooth wave oscillating circuit 3 at a comparator IC9, the output wherefrom is fed into an OR circuit IC11. The output therefrom is fed into the transistor Tr2 to actuate it and further the Tr3 is turned on to light up the lamp L in such a way as glowing by and by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56055115A JPS57172837A (en) | 1981-04-14 | 1981-04-14 | Control device for car lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56055115A JPS57172837A (en) | 1981-04-14 | 1981-04-14 | Control device for car lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57172837A true JPS57172837A (en) | 1982-10-23 |
Family
ID=12989748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56055115A Pending JPS57172837A (en) | 1981-04-14 | 1981-04-14 | Control device for car lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57172837A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5539628B2 (en) * | 1976-11-09 | 1980-10-13 |
-
1981
- 1981-04-14 JP JP56055115A patent/JPS57172837A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5539628B2 (en) * | 1976-11-09 | 1980-10-13 |
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