Optical instrument in which eyepiece tube and objective tube are surrounded in cast resin to make a rigid core enclosed in foamed synthetic resin
US4056303A · kind A · utility
5Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1976 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | May 18, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical instrument, for example a field-glass, in which the image-erecting system, the eyepiece tube and the objective tube are embedded in synthetic resin to form the housing of the instrument. The image-erecting system and the eyepiece and objective tubes and, if required, the hinge mechanism, are wholly or partially surrounded in cast resin to make a rigid core and this rigid core is partially or wholly enclosed in foamed synthetic resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.