Backlash reducing device for an objective lens assembly
US8102611B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 2008 |
| Grant date | Jan 24, 2012 |
| Priority date | — |
| Expiry date | Jun 5, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/021
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An objective lens assembly for night vision goggles including an objective lens cell having a threaded portion, an optical bench having a mating threaded portion for receiving the objective lens cell, and a snap-ring washer for reducing backlash between the objective lens cell and the optical bench. The objective lens cell includes a first wall radially extending away from an axial neck portion, the optical bench includes a second wall radially extending toward the axial neck portion and oriented substantially parallel to the first wall, and the snap-ring washer circumferentially surrounds the axial neck portion of the objective lens cell. The biasing element is configured for a relaxed mode of operation and a compressed mode of operation. In the relaxed mode, the snap-ring washer is inactive, and in the compressed mode, the snap-ring washer reduces backlash between the lens cell and the optical bench.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.