US PATENT SUBCLASS 396 / 62
.~ Illumination angle responds to focal length or distance

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61  DF  FLASH SYSTEM RESPONSIVE TO FOCAL LENGTH OR DISTANCE {1}
62.~ Illumination angle responds to focal length or distance

DEFINITION

Classification: 396/62

Illumination angle responds to focal length or distance:

(under subclass 61) Subject matter wherein an output light beam area of the artificial light varies according to the focal length of the exposure objective.

SEE OR SEARCH THIS CLASS, SUBCLASS:

175, for a variable illumination angle device, in general.