Image display apparatus

Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface

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Details

359630, 359668, 359727, 359728, G02B 2714, G02B 1308, G02B 1700

Patent

active

057680248

ABSTRACT:
An image display apparatus, e.g. a head-mounted image display apparatus, which enables observation of a clear image at a wide field angle, and which is extremely small in size and light in weight and hence unlikely to cause the observer to be readily fatigued. The image display apparatus has an image display device (6) and an ocular optical system (7). The ocular optical system (7) has a first surface (3), a second surface (4) and a third surface (5), which are disposed in the mentioned order from the observer's eyeball (1) side. The space between the first and second surfaces (3 and 4) and the space between the second and third surfaces (4 and 5) are filled with a medium having a refractive index larger than 1. The first and second surfaces (3 and 4) have different curvatures. The second surface (4) is a reflecting or semitransparent surface which is decentered with respect to an observer's visual axis (2), and which has a concave surface directed toward the observer's eyeball (1). Light rays emanating from the image display device (6) enter the observer's eyeball (1) without forming an intermediate image. The light rays are reflected once by the second surface (4) only. Thus, light rays from the image display device (6) are refracted by the third surface (5), reflected by the second surface (4), and further refracted by the first surface (3) so as to enter the observer's eyeball (1).

REFERENCES:
patent: 4026641 (1977-05-01), Bosserman et al.
patent: 4669810 (1987-06-01), Wood
patent: 4874214 (1989-10-01), Cheysson et al.
patent: 5513041 (1996-04-01), Togino
patent: 5539422 (1996-07-01), Heacock et al.
patent: 5546227 (1996-08-01), Yasugaki et al.

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