Projection unit with separable lamp capsule and slidable means f

Details Projection unit with separable lamp capsule and slidable means f Projection unit with separable lamp capsule and slidable means f

1981-04-13

1983-06-21

Brown, David H.

Illumination

Light source and modifier

Including reflector

362296, F21V 700

Patent

active

043897002

ABSTRACT:
A projection unit for use within a slide or film projector, or a microfilm viewer. The unit comprises an electrically insulative holder, a socket forming part of the holder's rear upstanding segment, a glass reflector secured to the holder's front segment such that its forward aperture aligns with an opening in the front segment, a tungsten-halogen lamp removably located within the socket and not engaging any of the interior surfaces of the reflector, and a slidable ejector (e.g., elongated bar member) for engaging the sealed end of the lamp and ejecting it out through the glass reflector's forward opening. Replacement of the lamp is thus possible without replacing the glass reflector. In addition, the invention maintains constant referencing characteristics to thereby enable successive, similar lamps to be precisely oriented within the reflector without the need for a prefocusing operation.

REFERENCES:
patent: 2264951 (1941-12-01), Naysmith
patent: 2864938 (1958-12-01), Shaw et al.
patent: 3314331 (1967-04-01), Wiley
patent: 3502864 (1970-03-01), Wagner
patent: 3621232 (1971-11-01), Hough et al.
patent: 3639750 (1972-02-01), Anthonijsz
patent: 3731133 (1973-05-01), McRae et al.
patent: 3789212 (1974-01-01), Wagner
patent: 4156901 (1979-05-01), Haraden et al.
patent: 4219870 (1980-08-01), Haraden et al.
patent: 4320439 (1982-03-01), Wiley

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