Zoom optical unit
US4884878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1986 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Nov 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is disclosed an optical unit which is primarily intended to retrofit existing work piece processing machines such as coordinate measuring machines, milling machines or EDM machines. The optical unit includes a zoom lens with a lens housing, and an optical coupling for a video camera. The lens housing isolates the optical elements against vibration during adjustment of the zoom lens, and for this purpose a flexible belt link is provided between a lens focusing knob and the zoom lens. An optical coupling having a relay or copying lens and an extender lens is included between the video camera and the zoom lens. This coupling effectively decrease the back focal length of the high magnification zoom lens and greatly compress the overall assembly. The optical coupling includes a coupling housing having a focusing cylinder that rotatably adjusts the position of the relay lens. The focusing cylinder has a base ring which is fixedly secured to the base unit of the assembly by mounting screws that are received in substantially larger through bores, thereby permitting shifting of the center line of the coupling assembly, compensating for any imperfections in alignment of the camera or z…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.