Head-up display

Details Head-up display Head-up display

1995-05-10

1998-01-20

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Head up display

359 13, 359 15, 359630, 359631, G03H 100, G02B 532, G02B 2714

Patent

active

057106460

ABSTRACT:
A head-up display includes a projector which projects an image light and a hologram lens which diffracts and reflects the projected image and form a virtual image located ahead of a windshield. The hologram lens has a vertical diffraction characteristic which is equivalent to a hyperbolic or parabolic-curve mirror along a line formed by the intersection of the hologram lens and a vertical plane which includes an axis of the image light and a horizontal diffraction characteristic which is equivalent to a parabolic or elliptic curve mirror along a line which is formed by the intersection of the hologram lens and a horizontal plane which includes the axis of the image light. When the hologram is directly attached on a curved windshield which has a focal length fs (in case it is a mirror), the focal length fo of the hologram and the former focal length fs has the following relationship; 1/fo=1/fh+1/fs, where fh is a focal point when the hologram is flat.

REFERENCES:
patent: 4600271 (1986-07-01), Boyer et al.
patent: 4688880 (1987-08-01), Tatsuno et al.
patent: 4786125 (1988-11-01), Margarinos et al.
patent: 4842389 (1989-06-01), Wood et al.
patent: 5461499 (1995-10-01), Sugita et al.

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