The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 1994
Filed:
Nov. 02, 1992
Nobuo Sugiyama, Kanagawa, JP;
Naoko Yamashita, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A photographic film cassette has a spool on which photographic film is wound, and a cassette shell for containing the spool rotatably. A photographic film passageway is formed in the cassette shell. The photographic film is passed out of and into a roll chamber through the passage. A pair of light-shielding members are attached to inside surfaces of the passageway for preventing ambient light from entering the cassette shell, and are provided respectively with innermost, midway and outermost portions, as viewed in the direction of advancement of the photographic film out of the film chamber. The respective innermost and outermost portions are spaced apart one from another. The respective midway portions are in contact one with another when a leader of the photographic film is entirely contained in the chamber. In a process for manufacturing the cassette, a horn of an ultrasonic welding device is applied to the light-shielding members, to weld them to cassette halves ultrasonically. In welding, pressure of the welding horn is varied between the midway portions and the innermost and outermost portions. The light-shielding members are thus compressed with heat for reducing the thickness thereof.