Abstract:
When rays of light (L1, L2) coming from arbitrary directions strike the incidence surface (3) at one of the ends of a transparent glass or plastic deflector (2), they repeat total reflection on opposing reflection surfaces (5a, 5b) inside the deflector (2) and the angles which they make with the perpendicular to the reflection surfaces gradually approach a critical angle delta0. Then the rays of light leave the deflector (2) from the outgoing surfaces (5a, 5b, 4) thereof and they come to possess directions of projection having an incremental component in the longitudinal direction of the deflector (2). Therefore, all the rays of light that strike the incidence surface (3) from all directions are provided with nearly the same direction of projection by passing them through the deflector (2). Typically, the deflector (2) has a wedge like plate form or a gimlet like form. Practically, a large number of deflectors (2) are juxtaposed with one another to form a board like assembly, and the rays of light are guided to strike one of the surfaces of the assembly.
Abstract:
A brightness enhancement film (40) has a plurality of linear prisms (46, 48, 50). The prisms are disposed in pairs, each pair having first and second prisms and each prism has a prism angle and a valley angle. Either the prism angles or the valley angles, but not both, are equal.
Abstract:
The proposed prism for obtaining a direct image has two reflecting faces in the form of three-dimensional reflecting holograms (2) at an angle of 90-180 DEG to each other. The plane of each of the holograms (2) is at an angle beta to the plane of the support (3) on which they are recorded, the value of beta depending on the angle alpha between the holograms (2) and on the refractive indices (n1, n2) of the support (3) and of the optical medium between them.
Abstract:
A device for deflecting and/or extending a person's field of view to enable that person to see round obstructions in his/her field of view comprising a bar prism having at least one concave face. The device is provided in a kit form for application onto a window, windscreen or mirror or the like or forms an integral part of same. In the case of its application with respect to windows when positioned adjacent a window frame in the field of view of a person the device enables that person to see objects which would normally be obscured by the frame. In the case of its use on a mirror the device significantly expands the field of view of a person e.g. a driver of a vehicle.
Abstract:
The present invention is a focusing system for focusing optically readable information over a substantial range of distances. The focusing system (10) includes a first optical wedge (12) and a second optical wedge (14) with a reciprocating drive for moving the prisms relative to each other.
Abstract:
Dispersive microlens apparatus (119) and methods are used in one mode for detecting multiple, different wavelengths (124A, 124B, 124C) from a bandwidth of wavelengths (existing within an image plane blur spot) and are used in another mode for combining a plurality of different, emitted wavelengths (151A, 151B, 151C) into a bandwave of wavelengths (at a blur spot in an image plane).