Patent ID: 6188841
Filing Date: 2001-02-13
Classification: G02B,G03B

Abstract:
A lens-fitted film unit having a unit body which is pre-loaded with a roll of unexposed photographic film strip and equipped with a taking lens comprising a plastic lens element and an exposure mechanism including a shutter, said lens-fitted film unit comprising:a lens holder, which is movable in a direction of an optical axis of said taking lens with respect to a film plane in which said unexposed photographic film strip is situated, for fixedly holding said plastic lens element at a predetermined axial distance from said film plane; andaxial distance adjusting means capable of thermally expanding and contracting and disposed between said lens holder and said film plane for changing an axial distance of said lens holder from said film plane in said direction in accordance with a change in ambient temperature to shift a focal point of said taking lens so as thereby to compensate a variation of said focal point of said taking lens due to a change in refractive power of said plastic lens element which is caused by axial expansion or axial contraction of said plastic lens element due to said change in ambient temperature.