JPH0164094U - - Google Patents
Info
- Publication number
- JPH0164094U JPH0164094U JP1987159715U JP15971587U JPH0164094U JP H0164094 U JPH0164094 U JP H0164094U JP 1987159715 U JP1987159715 U JP 1987159715U JP 15971587 U JP15971587 U JP 15971587U JP H0164094 U JPH0164094 U JP H0164094U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse
- signal
- frequency dividing
- light 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.)
- Granted
Links
- 238000007493 shaping process Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Electric Clocks (AREA)
Description
第１図は、本考案の実施例に係る自動車時計の
回路図である。第２図は、従来例を説明するため
のタイムチヤート。第３図は、第１図の回路の動
作を示すタイムチヤート。
１２……螢光表示管、２０……パルス発生回路
、２２……パルス形成回路、２４……第２の分周
回路、３２……ライトスイツチ。
FIG. 1 is a circuit diagram of an automobile watch according to an embodiment of the present invention. FIG. 2 is a time chart for explaining a conventional example. FIG. 3 is a time chart showing the operation of the circuit of FIG. 1. 12... Fluorescent display tube, 20... Pulse generating circuit, 22... Pulse forming circuit, 24... Second frequency dividing circuit, 32... Light switch.
Claims (1)
分周する分周回路と、分周回路の出力により時刻
を計時するカウンタと、このカウンタの出力を表
示信号に変換するデコーダと、外部操作によりデ
ユーテイ比の異なるパルス信号を出力するパルス
発生回路と、ライトスイツチと、前記分周回路の
途中段出力信号を分周する第２の分周回路を含み
、前記パルス発生回路からのパルス信号より周期
の短いパルス信号を形成するパルス成形回路と、
このパルス成形回路からのパルス信号を前記ライ
トスイツチがオフのときのみ出力する第１のゲー
ト回路と、前記デコーダからの表示信号が入力す
るとともに前記ライトスイツチオン時あるいは前
記パルス発生回路からのパルス発生時のみ前記表
示信号を通過させる第２のゲート回路と、この第
２のゲート回路からの表示信号をアノード側に入
力するとともに前記パルス発生回路のパルス非発
生時のみ表示を行うように構成された螢光表示管
と、を有する自動車時計の調光回路において、 前記パルス成形回路の第２の分周回路のリセツ
ト端子に前記パルス発生回路からのパルス信号が
供給され、このパルス発生時には前記第２の分周
回路はリセツトされることを特徴とした自動車時
計の調光回路。[Claims for Utility Model Registration] An oscillator that generates a reference signal, a frequency dividing circuit that divides the frequency of this reference signal, a counter that measures time based on the output of the frequency dividing circuit, and converts the output of this counter into a display signal. a decoder that outputs pulse signals with different duty ratios according to an external operation; a light switch; a pulse shaping circuit that forms a pulse signal with a shorter period than the pulse signal from the circuit;
A first gate circuit outputs a pulse signal from the pulse shaping circuit only when the light switch is off, and a first gate circuit receives a display signal from the decoder and generates a pulse when the light switch is turned on or from the pulse generating circuit. a second gate circuit that allows the display signal to pass only when the pulse generating circuit is not generating the display signal; In a dimmer circuit for an automobile watch having a fluorescent display tube, a pulse signal from the pulse generation circuit is supplied to a reset terminal of a second frequency dividing circuit of the pulse shaping circuit, and when this pulse is generated, the second A dimmer circuit for an automobile clock characterized in that the frequency dividing circuit is reset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15971587U JPH0531592Y2 (en) | 1987-10-19 | 1987-10-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15971587U JPH0531592Y2 (en) | 1987-10-19 | 1987-10-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0164094U true JPH0164094U (en) | 1989-04-25 |
| JPH0531592Y2 JPH0531592Y2 (en) | 1993-08-13 |
Family
ID=31441155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15971587U Expired - Lifetime JPH0531592Y2 (en) | 1987-10-19 | 1987-10-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0531592Y2 (en) |
-
1987
- 1987-10-19 JP JP15971587U patent/JPH0531592Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0531592Y2 (en) | 1993-08-13 |