Combiner mounting and stowage mechanism
US4664475A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Aug 14, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0156
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A mounting and stowage mechanism erects a head-up display combiner into the pilot's line-of-sight. One end of a crank is mounted on the combiner and is pivoted on a first link which is pivoted to a frame. A support link is pivoted on the combiner and on a drag link which is pivoted to the frame. A connecting link is pivoted to both the first link and the outer pivot of the drag link to complete a compound 4-bar linkage which controls the path of the combiner between the erected position and a stowed position out of the pilot's line-of-sight. Manual control is through a handle which is mounted on a slider for linear motion and is connected to the end of the crank remote from the combiner. The mechanism is rendered insensitive to motion in the combiner-erect position by assuring that the instant centers of the links carrying the combiner are located at twice the focal length from the combiner along a line that runs through the center of curvature of the combiner and its focal point. The mechanism thus reduces optical errors caused by play or vibration in the mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.