JPS64403A - Illuminating device - Google Patents
Illuminating deviceInfo
- Publication number
- JPS64403A JPS64403A JP15449687A JP15449687A JPS64403A JP S64403 A JPS64403 A JP S64403A JP 15449687 A JP15449687 A JP 15449687A JP 15449687 A JP15449687 A JP 15449687A JP S64403 A JPS64403 A JP S64403A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- fluorescent lamp
- luminous flux
- detection signal
- case
- 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
- Length Measuring Devices By Optical Means (AREA)
Abstract
PURPOSE: To stabilize illuminance by providing cooling means and controlling a luminous flux to a specified value while maintaining a fluorescent lamp in the controllable state of the luminous flux.
CONSTITUTION: A hermetically sealed case 11 has a transparent glass window 11a on the front face and the fluorescent lamp 1 is mounted on the side face thereof. Cooling air is circulated in the case by pipes 12. An optical sensor 21 mounted on the side wall of the case 11 detects the luminous flux of the fluorescent lamp 1 and outputs a detection signal to a control circuit 22 consisting of a differential operational amplifier. The circuit 22 outputs a control signal to a power supply circuit 23 in such a manner that the detection signal attains a set value. The circuit 23 regulates the impressed voltage of the fluorescent lamp 1 upon receipt of the control signal. A memory circuit 24 stores the value of the detection signal at the point of the time when commanded by a command circuit 25 as the set value of the circuit 22 and, therefore, the illuminance is stably controlled to the specified value simply by applying the command at the point of the time when the luminous flux stabilizes.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-154496A JPH01403A (en) | 1987-06-23 | lighting equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-154496A JPH01403A (en) | 1987-06-23 | lighting equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS64403A true JPS64403A (en) | 1989-01-05 |
JPH01403A JPH01403A (en) | 1989-01-05 |
Family
ID=
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