Lamp changing system for projectors

Details Lamp changing system for projectors Lamp changing system for projectors

1977-05-25

1979-02-27

Smith, Alfred E.

Electric lamp and discharge devices: systems

Automatic substitution of the load device or electrode

Plural substitution of load devices or electrodes

315159, H05B 3910, H05B 4146

Patent

active

041421299

ABSTRACT:
A photocell illuminated by the projection lamp of a slide projector controls a spring-biased longitudinally movable lamp exchange carrier. Lamp failure causes a change of state in the photocell that electronically releases an electromagnetic lock and allows the spring-tensioned lamp carrier to change positions. The last spare lamp is screened from the photocell, causing the electronic circuit to energize a fluorescent diode to indicate that the last spare lamp is being used.

REFERENCES:
patent: 2892966 (1959-06-01), Smyth
patent: 3027491 (1962-03-01), Seidler
patent: 3308338 (1967-03-01), Seidler
patent: 3914645 (1975-10-01), Li Donnici
patent: 3950741 (1976-04-01), Schroeder

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