Light-source switching and driving unit

Details Light-source switching and driving unit Light-source switching and driving unit

1996-06-18

1998-11-10

Lazarus, Ira S.

Illumination

Automatic substitution of power supply or light source

362 35, 362286, 362287, 362386, F21V 1904

Patent

active

058333436

ABSTRACT:
The present invention is a light-source switching and driving unit where an accurate stop operation and a strong holding force are obtained and which is capable of reducing a noise and preventing an impact to light-source lamps. In this unit, a plurality of light-source lamps for being switched and used are disposed. When a burnout sensor detects the burnout of a lamp being currently used, a spare light-source lamp is moved to a predetermined position by a stepping motor. In switching one lamp to another lamp, a pulse generating circuit generates a drive pulse which gradually increases when the stepping motor is started and a drive pulse which gradually decreases when the stepping motor is stopped. The stepping motor is driven by these drive pulses. With this, in switching one lamp to another lamp, a slow operation can be realized when the motor is started and when the motor is stopped.

REFERENCES:
patent: 3577173 (1971-05-01), Blomgren
patent: 3964040 (1976-06-01), Behl
patent: 4034259 (1977-07-01), Schoch
patent: 4112344 (1978-09-01), Klein
patent: 4137913 (1979-02-01), Georgi
patent: 4311586 (1982-01-01), Baldwin et al.
patent: 4402038 (1983-08-01), Hartung et al.
patent: 4415951 (1983-11-01), Recane et al.
patent: 4460353 (1984-07-01), Deckert et al.
patent: 5534854 (1996-07-01), Bradbury et al.

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