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AssigneeFuji Photo Film Co., Ltd.
InventorKoichi Takahashi
Estimating the term…
A photographic film cassette has a cassette shell, a spool contained in the cassette shell, and photographic film wound on the spool in a form of a roll. A leader of the photographic film is exited from the cassette shell through a passage mouth when the spool is rotated in the unwinding direction. A passageway is formed between the passage mouth and a roll chamber and has first and second inside faces which face respectively the emulsion and back surfaces of the photographic film. A first pair of ridges are formed on the first inside face, and contact on the emulsion surface in an area outside of exposure-designated image areas relative to a width of the strip of the photographic film. A second pair of ridges are formed on the second inside face, and contact on the back surface in an area outside of exposure-designated image area relative to the strip width. The two pairs ridges regulate a tendency of the photographic film to curl. In a preferred embodiment, a photographic film receiving gate of a camera is provided with a pair of ridges and pair of steps for regulation of the curl.
A photographic film cassette including a cassette shell having a roll chamber defined therein, a spool contained in said roll chamber in a rotatable manner, and photographic film having an emulsion surface and a back surface and being wound on said spool in a form of a roll with said emulsion surface facing an inside of said roll, said photographic film having a leader which passes through a passage mouth defined in said cassette shell when said spool is rotated in an unwinding direction, said photographic film cassette comprising:
A photographic film cassette including a cassette shell having a roll chamber defined therein, a spool contained in said roll chamber in a rotatable manner, and photographic film having an emulsion surface and a back surface and being wound on said spool in a form of a roll with said emulsion surface facing an inside of said roll, said photographic film having a leader which passes through a passage mouth defined in said cassette shell when said spool is rotated in an unwinding direction, said photographic film cassette comprising:
A photographic film cassette including a cassette shell having a roll chamber defined therein, a spool contained in said roll chamber in a rotatable manner, and photographic film having an emulsion surface and a back surface and being wound on said spool in a form of a roll with said emulsion surface facing an inside of said roll, said photographic film having a leader which passes through a passage mouth defined in said cassette shell when said spool is rotated in an unwinding direction, said photographic film cassette comprising:
A method of producing a photographic film cassette, said film cassette including a cassette shell having a roll chamber defined therein, a spool contained in said roll chamber in a rotatable manner, and photographic film wound on said spool in a form of a roll, said photographic film having a leader which is passed through a passage mouth formed in said cassette shell when said spool is rotated in an unwinding direction, said photographic film cassette further comprising a passageway formed between said passage mouth and said roll chamber for allowing said photographic film to pass therethrough, said passageway being defined between opposite first and second inside faces, said cassette further including a shutter rod arranged in said passageway for preventing ambient light from entering said roll chamber, said shutter rod being supported in a rotatable manner between said first and second shell halves to be moveable between closed and open positions in said passageway, a slot being formed through said shutter rod and being defined by first and second opposite walls, when said shutter rod is in said closed position, said walls block said passageway to prevent ambient light from entering said roll chamber, and, when said shutter rod is in said open position, said slot is aligned with said passageway to allow said photographic film to pass through said passageway, a first pair of projections formed on said first wall for coming in contact with said photographic film and a second pair of projections formed on said second wall for coming in contact with said photographic film, said first and second pair of projections regulating a tendency of said photographic film to curl relative to said a width-wise direction of said photographic film due to engagement with said film, said method comprising the steps of:
A camera for use with a photographic film cassette including a spool contained in a cassette shell in a rotatable manner, and photographic film wound on said spool in the form of a roll, said photographic film having a leader which passes through a passage mouth formed in said cassette when said spool is rotated in an unwinding direction, said camera comprising:
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Locating light-sensitive material within camera: locating spools or other rotatable holders of coiled film
Holders for containing light-sensitive material and adapted to be inserted within the camera: details of spools
Apparatus or arrangements for taking photographs or for projecting or viewing them
Term ended 29 Jun 2013 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a photographic film cassette, a camera for use therewith, and a method of manufacturing the cassette. More particularly, the present invention relates to an improvement of a photographic film cassette, having a moveable closing structure, in which a leader of a photographic film can be advanced to the outside of a cassette shell when a spool is rotated in an unwinding direction, and a camera and a manufacture method associated with such a cassette.
2. Description of the Related Art
The above objects and advantages of the present invention will become more apparent from the following detailed description when read in connection with the accompanying drawings, in which:
FIG. 1 is an exploded perspective view illustrating a photographic film cassette according to a preferred embodiment of the present invention;
FIG. 2 is a sectional view illustrating the cassette in a state in which a shutter plate is closed;
FIG. 1 illustrates a photographic film cassette of a preferred embodiment. A cassette shell 10 consists of a pair of shell halves 7 and 8. A photographic film 2 is wound around a spool 12 which is disposed in the cassette shell 10. The relevant parts, other than the film 2, are made from resin.
The upper shell half 7 is provided with a pair of arcuate ridges 15 which extend into a roll chamber 10a defined in the cassette shell 10. The lower shell half 8 is provided with a pair of arcuate ridges 16, as illustrated in FIG. 2. While the cassette shell 10 contains the spool 12 with the photographic film 2, the ridges 15 and 16 are in contact with the outermost turns of a roll 2d of the photographic film 2 to prevent the photographic film 2 form loosening around the spool 12. Note that the ridges 15 and 16 are in contact with the photographic film 2 at positions which are outside of the picture frame image areas, to be created on the photographic film 2, in the width-wide direction of the photographic film 2. Thus images on the photographic film 2 will not be scratched due to contact with the ridges 15 and 16. Of course, any known structure can be utilized for preventing loosening of the roll 2d. For example, the flanges 12a of the spool 12 can have circumferential lips formed thereon.
Ports 7a and 8a are formed on the shell halves 7 and 8, respectively. A passageway 22 and a passage mouth 20 are defined between the ports 7a and 8a (see FIG. 2). A separator claw 24 is formed on the lower shell half 8 on the innermost portion of the port 8a. When the roll 2d of the photographic film 2 is rotated by rotation of the spool 12, the claw 24 separates a leader 2c of the photographic film 2 from the roll 2d. The photographic film 2 is wound between the flanges 12a of the spool 12 with an emulsion surface 2a of the photographic film 2 facing the core of the spool. A trailer of the photographic film 2 is retained or anchored on the spool 12 in a known manner.