JPS59155238U - Dimmer device for vehicle display device - Google Patents
Dimmer device for vehicle display deviceInfo
- Publication number
- JPS59155238U JPS59155238U JP4962483U JP4962483U JPS59155238U JP S59155238 U JPS59155238 U JP S59155238U JP 4962483 U JP4962483 U JP 4962483U JP 4962483 U JP4962483 U JP 4962483U JP S59155238 U JPS59155238 U JP S59155238U
- Authority
- JP
- Japan
- Prior art keywords
- dimmer
- vehicle display
- duty ratio
- square wave
- wave signal
- 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
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の車両用表示装置の調光装置のブロック線
図、第２図は方形波発振回路の出力のデユーティ比と表
示ランプの相対輝度との関係を示す調光特性図、第３図
は本考案による車両用表示装置の調光装置の一実施例を
示すブロック線図、第４図は本考案に用いられるデユー
ティ比検出回路の一実施例、第５図はデユーティ比検出
回路におけるタイミングチャート、第６図は方形波発振
回路の出力のデユーティ比と表示ランプの相対輝度との
関係を示す調光特性図である。
１・・・方形波発振回路、２・・・可変抵抗器、３用う
ンプ駆動回路、４・・・減光回路、５・・・ライティン
グ・スイッチ、６・・・表示ランプ、７・・・デユーテ
ィ比検出回路。Fig. 1 is a block diagram of a conventional dimmer of a vehicle display device, Fig. 2 is a dimmer characteristic diagram showing the relationship between the duty ratio of the output of the square wave oscillation circuit and the relative brightness of the display lamp, and Fig. 3 The figure is a block diagram showing one embodiment of the dimming device for a vehicle display device according to the present invention, FIG. 4 is an embodiment of the duty ratio detection circuit used in the present invention, and FIG. The timing chart in FIG. 6 is a dimming characteristic diagram showing the relationship between the duty ratio of the output of the square wave oscillation circuit and the relative brightness of the display lamp. DESCRIPTION OF SYMBOLS 1... Square wave oscillation circuit, 2... Variable resistor, 3 pump drive circuit, 4... Dimming circuit, 5... Lighting switch, 6... Display lamp, 7...・Duty ratio detection circuit.
Claims (1)
度を調光可能とし、かつライティング・スイッチがオン
しているときには該表示用ランプの輝度を減光する車両
用表示装置の調光装置において、前記方形波信号のデユ
ーティ比を検知する検知手段と、前記方形波信号のデユ
ーティ比が所定値になったときに減光機能を解除する解
除手段とを設けたことを特徴とする車両用表示装置の調
光装置。In a dimmer device for a vehicle display device, which controls the duty ratio of a square wave signal to make the brightness of a display lamp dimmable, and reduces the brightness of the display lamp when a lighting switch is on. , a vehicle display comprising: a detection means for detecting the duty ratio of the square wave signal; and a canceling means for canceling the dimming function when the duty ratio of the square wave signal reaches a predetermined value. Device dimmer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4962483U JPS59155238U (en) | 1983-04-05 | 1983-04-05 | Dimmer device for vehicle display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4962483U JPS59155238U (en) | 1983-04-05 | 1983-04-05 | Dimmer device for vehicle display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59155238U true JPS59155238U (en) | 1984-10-18 |
Family
ID=30180123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4962483U Pending JPS59155238U (en) | 1983-04-05 | 1983-04-05 | Dimmer device for vehicle display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59155238U (en) |
-
1983
- 1983-04-05 JP JP4962483U patent/JPS59155238U/en active Pending
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