One-time use camera with film winding detection to enable exposure-related component
US6304722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Jan 11, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2219/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A one-time use camera comprising a filmstrip having successive frames including first- and last-to-be-exposed frames and a pre-exposure frame immediately preceding the first-to-be-exposed frame, a backframe opening at which the respective frames of the filmstrip beginning with the first-to-be exposed frame and ending with the last-to-be-exposed frame are exposed during picture-taking, a film cartridge which contains a film take-up spool that is manually rotated decreasing angles of rotation to wind the respective frames of the filmstrip beginning with the pre-exposure frame from the backframe opening onto said spool, and an exposure-related component that must be enabled in order to operate, is characterized in that a rotation-sensing detector for sensing rotation of the spool is connected with the exposure-related component to enable the exposure-related component when the spool is rotated an angle of rotation no greater than an angle sufficient to wind the last-to-be exposed frame onto the spool, whereby the exposure-related component can be enabled each time the spool is rotated to wind one of the frames of the filmstrip onto the spool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.