Control apparatus for resetting a shielding wheel of a stepwise

Details Control apparatus for resetting a shielding wheel of a stepwise Control apparatus for resetting a shielding wheel of a stepwise

1998-07-23

2000-02-29

Spyrou, Cassandra

Illumination

Light source and modifier

Condition responsive

362284, 362293, 362324, F21V 2128

Patent

active

060301007

ABSTRACT:
A control apparatus capable of resetting a shielding wheel of a stepwise light projecting device to a predetermined starting position includes a photosensor, a slotted wheel and a control circuit unit. The device includes a stepping motor, an output shaft which extends outwardly from front and rear lateral walls of the motor, and the shielding wheel fixed to a front end of the shaft. The photosensor includes a phototransmitter and a photoreceiver spaced from the phototransmitter to define a channel therebetween. The slotted wheel is mounted on a rear end of the shaft, and has a circumferential portion that extends into the channel and that is formed with a radial slot to permit transmission of radiant energy from the phototransmitter to the protoreceiver only when the shielding wheel is in the starting position. When the shielding wheel is in the starting position, the control circuit unit activates the stepping motor to rotate the shielding wheel in a stepwise manner in order to result in a predetermined stepwise light projecting effect.

REFERENCES:
patent: 3045208 (1962-07-01), Tiberio
patent: 3603722 (1971-09-01), Graham
patent: 4600976 (1986-07-01), Callahan
patent: 4878109 (1989-10-01), Hillis
patent: 4914556 (1990-04-01), Richardson
patent: 5513083 (1996-04-01), Chang
patent: 5665305 (1997-09-01), Belliveau
patent: 5868482 (1999-02-01), Edlinger

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