Collapsible lens shade
US4205895A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1978 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Mar 31, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B11/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A collapsible lens shade comprises a foldable bellows connected between front and second plate-like members. A track member is pivotally connected to one of the front and rear plate-like members, preferably the front member, and locking means is provided for locking the track in a position extending from the member to which it is pivotally connected. Slide means is coupled to the other of the front and rear members to permit same to slide along the length of the track member when the track member is in its extended, locked position, and second locking means is provided for locking the slide means at selected positions along the length of the track means. Replaceable adaptors are preferably provided to enable the lens shade to be used with lenses of various barrel diameters. Also, means for inserting filters or other special effect plates is provided, as well as a flash or accessory shoe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.