Scene-brightness-dependent control of flashbulb flash duration

Details Scene-brightness-dependent control of flashbulb flash duration Scene-brightness-dependent control of flashbulb flash duration

1976-10-22

1978-07-11

Miller, J D

Illumination

Photographic lighting

Including specific light modifier

362 4, 362 5, G03B 1502

Patent

active

041005902

ABSTRACT:
An apparatus is described for effecting scene-brightness-dependent control of the duration of the flash produced by a flashbulb flash unit having at least one flashbulb. The apparatus includes a housing so configured and dimensioned that it can be pushed over and onto the flashbulb flash unit. The housing is provided with at least one controllable-transparency optical unit located to occupy the position in front of the flashbulb of the flash unit when the housing has been pushed into place over the flash unit. The housing furthermore contains an automatic scene-brightness-dependent flash-duration control circuit connected to the optical unit and operative for controlling the duration of the flash produced by the flashbulb by keeping the optical unit transparent for a scene-brightness-dependent exposure interval and then automatically rendering the optical unit non-transparent.

REFERENCES:
patent: 3456101 (1969-07-01), Rentschler et al.
patent: 3517196 (1970-06-01), Owens
patent: 3597044 (1971-08-01), Castellano
patent: 3783260 (1974-01-01), Broadt et al.

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