Displaceable doubled-over sheet configuration, useful particularly for a variable light transmission device
US5742430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Jul 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3033
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A device is provided including a flexible sheet having extents encompassing at least a circular area, said flexible sheet doubled-over upon itself through the center of the circular area such that the resultant respective halves of said circular area overlap and form a semicircular field of view; and a sleeve for maintaining the overlapping configuration of said doubled-over flexible sheet, yet allowing said flexible sheet to be displaced about the center of said circular area within the doubled-over configuration. In a particular embodiment, the encompassed circular area of said flexible sheet has at least one light-transmissive region within the circular area, such that transmission of light through the aforementioned field of view can be varied by said displacement of the flexible sheet within said doubled-over configuration. Such embodiment, when employing a polarizing sheet as said flexible sheet, can be used as a variable light transmission device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.