Disposable camera with simplified film advance and indicator

• US 4,268,150 A
• Filed: 01/28/1980
• Issued: 05/19/1981
• Est. Priority Date: 01/28/1980
• Status: Expired due to Term

• Current Assignee: Laurence Chen
• Original Assignee: Laurence Chen
• Inventors: Chen, Laurence
• Primary Examiner(s): GRIFFIN, DONALD
• Application Number:
  US06/115,932
• Time in Patent Office: 477 Days
• Field of Search: 354/275, 354/206, 354/213, 354/217, 354/218, 354/170, 354/171
• US Class Current: 396/396
• CPC Class Codes: G03B 17/36 Counting number of exposures of film strips G03B1/66
• CPC Class Codes: G03B 17/42 Interlocking between shutter operation and advance of film or change of plate or cut-film

Abstract

An inexpensive, small size, disposable camera is provided. The camera utilizes a preloaded film and includes a film strip indicator which is driven by the shutter mechanism for display at the front of the camera. A novel film advance mechanism is also provided that obtains a uniform and precise alignment of a film frame which coincides with a film numerical designation using conventional film without requiring a sprocket drive.

Claims

1. A disposable camera including a spring biased, rotatable film wind up roll;

an end piece mounted on the wind up roll and bearing a circular groove thereon, and a plurality of equidistant stops spaced within the groove;

a film supply roll for feeding the wind up roll;

a downwardly biased member attached to the camera body and including a spring biased sheet with an engagement finger adapted to provide a sliding fit with the groove of the end piece to releasably engage the stops within the grooves and prevent rotation of the film wind up roll when thus engaged;

a lens;

a shutter;

a spring biased shutter actuator, indluding a retaining finger having a shallow indent, the retaining finger being adapted to elevate the engagement finger out of contact with a groove stop upon release of the shutter until the downwardly biased member engages a succeeding stop in the groove, and continued elevation of the shutter causes the retaining finger and downwardly biased member to separate, and the engagement finger to re-enter the groove and prevent further film windup when the engagement finger contacts a succeeding stop;

an edge portion of the downwardly biased member being sized to contact the indent of the retaining finger and stabilize movement of the engagement finger within the groove.

2. The disposable camera of claim 1, in which each stop provides a vertical leading edge for engagement with the downwardly biased member, and a trailing edge having an inclined portion thereby permitting the downwardly biased member to make contact therewith and reenter the groove.

3. The disposable camera of claim 1, including a top cover adapted to fit into the end piece thereby improving alignment of the wind up roll.

4. The disposable camera of claim 1, including a film bushing surrounding the film supply roll, and sponge means disposed between the camera body and the film, thereby improving film alignment.

5. The disposable camera of claim 1, employing a sprocketted film.

6. The disposable camera of claim 1, employing a 110 sprocketted film.

7. The disposable camera of claim 1, including a camera cover adapted to interfit with the end piece, thereby maintaining alignment of the wind up roll during film advancement.

8. The disposable camera of claim 1, including a rotatable disc defining a central orifice coinciding with the lens, the disc being driven from the shutter actuator and bearing indicia at its periphery corresponding to the film position.