Automotive headup display apparatus

Details Automotive headup display apparatus Automotive headup display apparatus

1991-03-07

1992-10-20

Arnold, Bruce Y.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359 13, 359630, 340705, G02B 2714

Patent

active

051575493

ABSTRACT:
The automotive headup display apparatus contains an indicator and a reflection member and has an opening directed toward a reflection surface as on a windshield. A Fresnel lens is installed in the opening for enlarging a display image of the indicator. The reflection member is disposed facing and between the indicator and the reflection surface. The reflection member is coated with a hologram emulsion layer to have a wavelength selection capability such that only the rays of light with almost the same wavelength as display light of the indicator are reflected by the reflection membeer. With this arrangement, when external light should enter the indicator unit from the reflection surface on the windshield, those rays of light different in wavelength from the display light are not reflected toward the indicator, preventing the display of the indicator from being obscured as in the conventional apparatus.

REFERENCES:
patent: 3940204 (1976-02-01), Withrington
patent: 4457579 (1984-07-01), Thylen
patent: 4582394 (1986-04-01), Boyd
patent: 4613200 (1986-09-01), Hartman
patent: 4669810 (1987-06-01), Wood
patent: 4832427 (1989-05-01), Nanba et al.

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