Iris leaf for optical component
US4009946A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1975 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Feb 21, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Iris leaves for optical components such as diaphragms or shutters are injection-molded, together with integral pivot pins, of thermoplastic resin which is given a mat appearance by a roughening of the mold-cavity surfaces. In the case of a composite leaf consisting of two legs articulated to each other, each leg is a curved foil whose cross-section tapers from its convex to its concave edge to facilitate relative swinging of the legs. The mold cavities are duplicated in confronting surfaces of coacting mold halves and open into deeper sprue channels whose junctions with the cavities are formed by converging slots in shearing bolts that are guided in transverse bores encroaching upon the convex cavity edges, a displacement of these shearing bolts by a distance greater than the foil thickness severing the molded leaves from the runners before the mold is opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.