WO1998018038B1

WO1998018038B1 - Optical system for head up display

Info

Publication number: WO1998018038B1
Application number: PCT/HU1997/000067
Authority: WO
Filing date: 1997-10-18
Publication date: 1998-06-11
Anticipated expiration: 1999-04-22

Abstract

The imaging device has two screens and an optical system consisting of pre-eye mirrors and lenses for transmitting beams of light from the screens to the eyes. The device is characterized in that a lens system consisting of at least three members is arranged in each light path starting from the screens (7, 8) and reflected by the pre-eye mirrors (3, 4) into the pupils of the eyes (1, 2); two members of the lens system, a converging lens and a diverging lens, are placed side by side directly or with a distance, said members forming together a corrected subsystem (13, 14); and the third member of the lens system is placed separately from said subsystem and comprises a converging lens, optionally combined with a diverging lens (11, 12).

Claims

28

AMENDED CLAIMS

[received by the International Bureau on 29 April 1998 (29.04.98); original claims 1-17 replaced by amended claims 1-7 (2 pages)]

.1. Imaging device having two screens and an optical system 'consisting of pre-eye mirrors and lenses for transmitting beams of light from the screens to the eyes, c h a r a c t e r i z e d in that the two screens (7a, 8a) are arranged side by side, in the same plane, facing the same direction; in front of each screen (7a, 8a) , a first mirror (3b, 4b) is arranged defining an angle of 45°±10° relative to the plane of the screens (7a, 8a) , and an angle of 90^ώ±20^β relative to the other first mirror, said first mirrors (3b, 4b) form a V-shape with an open side turned away from the screens; the first mirrors (3b, 4b) project the light beams from the screens (7a, 8a) onto the pre-eye mirrors (3, 4) arranged parallel to the first mirrors (3b, 4b) ; and the pre-eye mirrors (3, 4) reflect said light beams further into the eyes (I, 2) of the viewer.

2. Device as claimed in claim i , c h a r a c t e r i z e d in that the left side display panel (5a), the left side first mirror (3b) , the left side pre-eye mirror (3) and the left side lenses (11/ 13) are held together by a left side housing (15); similarly, the right side display panel (6a), the right side first mirror (4b), the right side pre-eye mirror (4) and the right side lenses are held together by a right side housing (16), and said housings (15, 16) are fixed to a common framework (17) .

3. Device as claimed in claim 1 or 2, c h a r a c t e r i z e d in that one of the elements fixing the device to the head (18) is a pair of glasses (19), " and the other fixing element is an adapter (20) comprising upright guideways, preferably slides, fastening the common framework (17) to the glasses (19) .

4. Device as claimed in any one of claims 1- 3, c h a r a c t e r i z e d in that the left side housing (15) and the right side housing (16) are connected to the common framework (17) by means of horizontal guideways.

5. Device as claimed in any one of claims 1- 4, c h a r a c t e r i z e d in that the adapter fixing the device to the glasses comprises a flexible strip 7-10 cm in length, said strip having widened ends bent back in U-shape to form two clip elements (70, 71); and the middle part of the strip is a widened platform (73) with a supporting tongue (72) bent back in U-shape in the direction opposite to the direction of said clip elements (70, 71) .

6. Device as claimed in any one of claims 1- 5, c h a r a c t e r i z e d in that the operating circuits (51) of the display panels are placed separately from the head (18) in a separate box (52) or built together with the source of the video signal, e.g. computer, video player, camera, or TV receiver.

7. Device as claimed in any one of claims 1- 6, c h a r a c t e r i z e d in that two video signal inputs (63, 64) are provided on the separate box (52) to receive the left side and right side video signals of the stereoscopic image to be displayed.