Filter mechanism with interconnected heat and color filters for

Details Filter mechanism with interconnected heat and color filters for Filter mechanism with interconnected heat and color filters for

1976-05-27

1977-08-23

Henry, Jon W.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350316, 350318, 351 9, 351 26, 351 28, 351 29, G02B 522, G02B 700, A61B 310, A61B 307

Patent

active

040436462

ABSTRACT:
A filter mechanism for use with a source of white light permits selective color filtration of the white light, as well as unfiltered light transmission. A color filter support, having a plurality of spaced color filters, mounts the filters for selective movement in and out of the path of light from the source. A heat protection filter support mounts a heat protection filter for movement between an active position in the path of light from the source and an inactive position out of the path of light. In a preferred embodiment, the color filter support and heat filter support are mechanically coupled so that when a color filter is placed in the path of light, the heat filter is in its active position, but when no color filter is placed in the light path the heat filter is in its inactive position.

REFERENCES:
patent: 1062081 (1913-05-01), Converse et al.
patent: 3195398 (1965-07-01), Shaw
Wald, Josa, Mar. 1945, pp. 187-189, vol. 35, No. 3.

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