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US Patent 4978891 - Electrodeless lamp system with controllable spectral output

US Patent Issued on December 18, 1990
Estimated Patent Expiration Date: Icon_subject April 17, 2009Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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Abstract

An electrodeless lamp system and method for providing light output having a controlled spectral distribution. A lamp having a fill which is not fully vaporized at the lamp operating temperature and which emits in a characteristic region of the spectrum is used. A function generator generates a function signal, and the magnitude of the lamp output in the characteristic region or the ratio of such magnitude and a magnitude in a different characteristic region is compared with the function signal. The difference signal is used to control the amount of cooling gas which is incident on the lamp bulb to control the spectral distribution of the radiation which is emitted by the lamp.

Inventor

Assignee

Application

No. 344863 filed on 04/17/1989

US Classes:

315/117, Automatic control of the temperature modifier315/151, Load device irradiating the radiant energy responsive device315/248, Induction-type discharge device load315/326, DISCHARGE DEVICE LOAD315/344Electromagnetic influenced discharge device

Field of Search

315/248, Induction-type discharge device load315/117, Automatic control of the temperature modifier315/118, Load device circuit controlled by the temperature modifying medium315/326, DISCHARGE DEVICE LOAD315/344, Electromagnetic influenced discharge device315/112, WITH LOAD DEVICE TEMPERATURE MODIFIER315/151, Load device irradiating the radiant energy responsive device313/13Having control means for the temperature modifier

Examiners

Primary: LaRoche, Eugene R.
Assistant: Neyzari, Ali

Attorney, Agent or Firm

US Patent References

3604500, 3786308, 4256404, Optoelectronic feedback control for a spectrometer
Issued on: 03/17/1981
Inventor: Walker
4431947, Controlled light source
Issued on: 02/14/1984
Inventor: Ferriss ,   et al.
4449821, Process colorimeter
Issued on: 05/22/1984
Inventor: Lee
4485332, Method & apparatus for cooling electrodeless lamps
Issued on: 11/27/1984
Inventor: Ury ,   et al.
4695757Method and apparatus for cooling electrodeless lamps
Issued on: 09/22/1987
Inventor: Ury ,   et al.

International Classes

H05B 041/24
H01J 015/04

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