JPH03114812U

JPH03114812U -

Info

Publication number: JPH03114812U
Application number: JP2319790U
Authority: JP
Priority date: 1990-03-09
Filing date: 1990-03-09
Publication date: 1991-11-26

Description

[Brief explanation of the drawing]

第１図は本考案実施例の光線方向規制装置を示
す図、第２図は実施例における透過特性を示す図
、第３図は実施例の光線方向規制装置を使用した
車両用表示装置を示す図、第４図は従来の光制御
板の断面構造を示す図、第５図は同従来の光制御
板の透過特性を示す図である。１１……第１プリズム、１２……第２プリズム
、１３……第１補正プリズム、１４……第２補正
プリズム、１１Ａ，１２Ａ……第１界面、１１Ｂ
，１２Ｂ……第２界面。 Fig. 1 is a diagram showing a light direction regulating device according to an embodiment of the present invention, Fig. 2 is a diagram showing transmission characteristics in the embodiment, and Fig. 3 is a diagram showing a vehicle display device using the light direction regulating device according to the embodiment. 4 are diagrams showing the cross-sectional structure of a conventional light control plate, and FIG. 5 is a diagram showing the transmission characteristics of the conventional light control plate. 11...First prism, 12...Second prism, 13...First correction prism, 14...Second correction prism, 11A, 12A...First interface, 11B
, 12B... second interface.

Claims

[Claims for Utility Model Registration] (1) The first prism and the second prism, in which the prism angle formed by the first interface and the second interface that meet are set, are placed in the first prism such that the directions of the prism angles are opposite to each other. The second interface of the prism and the first interface of the second prism are arranged to face each other, and a first correction prism having a prism angle equal to that of the first prism is arranged between the first prism and the second prism. and a second correction prism having the same prism angle as the second prism and placed on the second interface side of the second prism so that the directions of the prism angles are opposite to each other. A light ray direction regulating device arranged so that a plurality of light rays having different incident angles incident from a first interface of the first prism are totally reflected at a second interface of the prism and a light ray totally reflected at the second interface of the first prism. At the same time, the refraction angle of the light beam transmitted through the second interface is corrected by the first correction prism, and the light beam is transmitted through the second interface of the first prism and the first correction prism. splits a plurality of light rays incident on the first interface of the second prism into light rays that are totally reflected at the second interface of the prism and light rays that pass through this second interface, and transmits through this second interface. By correcting the refraction angle of the light ray with the second correction prism, the range of the incident angle at the first interface of the first prism of the light ray that can pass through the second correction prism is regulated. A light beam direction regulating device. (2) The light ray according to claim 1, wherein at least the first prism and the second prism have a third interface sandwiched between the first interface and the second interface which has been subjected to a non-reflection treatment in a dark color. Direction regulating device.