Lens-fitted photographic film unit
There is disclosed a lens-fitted photographic film unit preloaded with an unexposed photographic film. A light regulating filter is disposed between the photographic film and a shutter blade. Light from a subject is applied to the light regulating filter only when the shutter blade is opened. The light regulating filter is obtained by coating a base with an electrochromic material, and light transmittance thereof is changed depending on a voltage to be applied. When a photometric switch is turned on, a photometric circuit measures brightness of the subject. According to the brightness of the subject, a controller controls the voltage to be applied to the light regulating filter.
1 . A lens-fitted photographic film unit preloaded with an unexposed photographic film comprising:
a shutter blade swingable between a closing position and an opening position, said photographic film being exposed by light from a subject at said opening position;
a light regulating member disposed between said shutter blade and said photographic film, light transmittance of said light regulating member being changed depending on a voltage; and
a driver for applying said voltage to said light regulating member.
2 . A lens-fitted photographic film unit as defined in claim 1 , said lens-fitted photographic film unit further comprising:
a photometric device for measuring brightness of said subject; and
a controller for controlling said driver so as to apply said voltage to said light regulating member in accordance with the brightness of said subject measured by said photometric device.
3 . A lens-fitted photographic film unit as defined in claim 2 , said lens-fitted photographic film unit further comprising a dark box disposed in front of said photographic film, said dark box being provided with said light regulating member.
4 . A lens-fitted photographic film unit as defined in claim 3 , wherein said light regulating member includes a support and an electrochromic material coated on said support.
5 . A lens-fitted photographic film unit as defined in claim 4 , said lens-fitted photographic film unit further comprising a photometric switch for turning said photometric device on and off.
6 . A lens-fitted photographic film unit as defined in claim 5 , said lens-fitted photographic film unit further comprising:
an electronic flash device; and
an electronic flash switch for turning said electronic flash device on and off, wherein
said controller adjusts said voltage depending on an on-state and an off-state of said electronic flash switch.