Image projector

Details Image projector Image projector

2006-09-26

2006-09-26

Dowling, William C. (Department: 2851)

Optics: image projectors

Lamp control

Reexamination Certificate

active

07111944

ABSTRACT:
In an image projector for enlarging and projecting an image on a screen, a condition of a discharge lamp is judged so as to alarm that the discharge lamp has been damaged or life of the discharge lamp reaches to a late stage to a user. A driving circuit of the image projector comprises: a driving signal generator generating a driving signal applied to the discharge lamp, and executing feedback control so as to make power consumption of the discharge lamp substantially constant; a lamp condition judger judging that the discharge lamp has been damaged, the discharge lamp has been normally lighted or not lighted or life of the discharge lamp reaches to a late stage corresponding to a value of voltage or current of the driving signal; and an alarm output unit outputting an alarm corresponding to the result of judgment of the lamp condition judger.

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patent: 05-038481 (1993-02-01), None
patent: 2000-048989 (2000-02-01), None

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