Light intercepting device of a camera
US4324470A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1981 |
| Grant date | Apr 13, 1982 |
| Priority date | — |
| Expiry date | Jan 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a camera which has a through-hole formed in a portion of a wall forming a chamber for containing therein a magazine of roll film wound around a spool shaft which faces the end surface of the spool shaft and to which is mountable an electric film rewind device having a drive shaft inserted into the chamber through the through-hole and coupled to the spool shaft and wherein a light-intercepting ring having a contact surface bearing against the end surface of the spool shaft and biased axially of the spool shaft toward the interior of the chamber is slidably fitted in the through-hole, the light-intercepting ring has on said contact surface an annular ridge projected axially of the spool shaft. The ridge is provided at a location which is adjacent to and along the end surface during the contact thereof with the end surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.