Patent ID: 7010222

Claim:
A lens-fitted photo film unit, having a photo film holder chamber and a cassette holder chamber, said photo film holder chamber being loaded with a roll of unexposed photo film, and said cassette holder chamber being loaded with a cassette for winding and containing said photo film after being exposed, said lens-fitted photo film unit comprising: said cassette comprising a cassette shell and a spool rotatably mounted therein, the cassette shell including first and second end portions, and a middle portion disposed between said first and second end portions, said first end portion having an outer diameter d 1 , said second end portion having an outer diameter d 2 , wherein said outer diameter d 1 is in a standardized range according to 135 type of a photo film cassette; said cassette holder chamber including first and second chamber end regions, and a chamber middle region, said first and second chamber end regions receiving respectively said first and second end portions, said chamber middle region receiving said middle portion, said first chamber end region having an inner diameter D 1 , said second chamber end region having an inner diameter D 2 ; wherein said cassette and said cassette holder chamber satisfy a condition of: d 2 ≦D 2 <d 1 ≦D 1 .