US 7,248,793 B2 · Lens-fitted photo film unit

Abstract

A lens-fitted photo film unit provides a daylight photography mode to select no flash emission and the small stop, a daylight synchro photography mode to select normal flash emission and the small stop, and a night view synchro photography mode to select reduced flash emission and the large stop. The small stop is composed of the small stop aperture of f/16 and an ND filter of transmittance of 25% to be attached to cover the small stop aperture. The shutter speed is set at 1/64 sec. in any modes. The photo film preloaded in the lens-fitted photo film unit has ISO sensitivity 3200. The stable photographing is achieved under the wide range of brightness by the changeover of the stop, without the change of the shutter speed. In brightness of EV 9 to 11, the exposure amount becomes proper either in the daylight photography mode and in the night view synchro photography mode.

Claims8

Dependent claims

A lens-fitted photo film unit comprising:

a photo film preloaded in said lens-fitted photo film unit, ISO sensitivity of said photo film being 3200;
a shutter device disposed in a photography optical path for exposing said photo film, shutter speed of said shutter device being set at 1/64 sec.;
a photography mode selection device for selecting at least one of first and second photography modes;
and
an aperture changeover means for controlling exposure amount on said photo film in cooperation with said photography mode selection device, said aperture changeover means being set in a small stop state when said first photography mode is selected, and being set in a large stop state when said second photography mode is selected, said exposure amount being controlled by a first aperture of f/16 and an ND filter having transmittance of 25% in said small stop state, and being controlled by a second aperture of f/5.6 in said large stop state.

2 more elements

Dependencies are inferred from the claim text.

Lens-fitted photo film unit

Life of this patent

Lens-fitted photo film unit

Life of this patent

Abstract

Claims8