JPS5493870A - Apparatus for stepwise controlling intensity of light - Google Patents
Apparatus for stepwise controlling intensity of lightInfo
- Publication number
- JPS5493870A JPS5493870A JP16018777A JP16018777A JPS5493870A JP S5493870 A JPS5493870 A JP S5493870A JP 16018777 A JP16018777 A JP 16018777A JP 16018777 A JP16018777 A JP 16018777A JP S5493870 A JPS5493870 A JP S5493870A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- lamp
- relay
- contact
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
PURPOSE: To provide an apparatus for stepwise controlling brightness of a lamp, in which brightness of the lamp is changed stepwise by controlling a switching element to a certain conduction phase angle at the time when charging of a capacitor is completed, whereby switching from full-lighted mode to brightness-controlled mode can be effected instantly.
CONSTITUTION: Provided that changeover switch 5 is turned to the side of first contacts 6, 6a with wall switch 7 being kept in its ON-position, lamp 3 is fully lighted since it is connected to power source E via ballast B, first contact 6a of changeover switch 5 and wall switch 7. Simultaneously with this full lighting of lamp 3, relay Ry is energized momentarily via the circuit of power source E, the first contact 6a of changeover switch 5, capacitor 19, relay Ry, diode 20 and power source E, whereby relay contact (r) is closed momentarily and residual charge of capacitor 1 is discharged through resistance 9. When the switch 5 is turned to the side of a second contact 8, on the other hand, relay Ry is not energized and transistor Tr is kept in its OFF-condition since charging of capacitor 1 is completed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16018777A JPS5493870A (en) | 1977-12-30 | 1977-12-30 | Apparatus for stepwise controlling intensity of light |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16018777A JPS5493870A (en) | 1977-12-30 | 1977-12-30 | Apparatus for stepwise controlling intensity of light |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5493870A true JPS5493870A (en) | 1979-07-25 |
Family
ID=15709695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16018777A Pending JPS5493870A (en) | 1977-12-30 | 1977-12-30 | Apparatus for stepwise controlling intensity of light |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5493870A (en) |
-
1977
- 1977-12-30 JP JP16018777A patent/JPS5493870A/en active Pending
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