On-vehicle head up display device with double images angularly separated less than a monocular resolving power
First Claim
1. An on-vehicle head-up display apparatus wherein a windshield glass having inner and outer surfaces of a vehicle is utilized as a catoptric system to reflect an image of various information in the vehicle from said inner and outer surfaces of said windshield glass, comprising:
- display means for indicating said information; and
an optical system positioned between said windshield glass and said display means for forming an indication image of said indicated information having an object point therein, light beams from said object point impinging upon said inner and outer surfaces of the windshield glass to be reflected to form a virtual image in a doubled state at a finite distance outside the windshield glass, and said optical system forming said indication image beyond said display means to form an angle defined by said reflected light beams reflecting from said inner and outer surfaces thereof, which is smaller than a monocular resolving power.
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Abstract
In an on-vehicle head up display device employing a catopric system for a windshield glass of an automobile to project a display image onto an inner surface of the windshield glass, an optical system for letting a virtual image of the display image of a display means enter the windshield glass is adapted to make an angle formed by light beams of the virtual image entering the windshield glass less than a monocular resolving power. Further, an optical means for correcting parallax of the light beams of the virtual image is provided between the optical system and the windshield glass. Thus, a double image formation and binocular parallax may be eliminated.
40 Citations
5 Claims
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1. An on-vehicle head-up display apparatus wherein a windshield glass having inner and outer surfaces of a vehicle is utilized as a catoptric system to reflect an image of various information in the vehicle from said inner and outer surfaces of said windshield glass, comprising:
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display means for indicating said information; and an optical system positioned between said windshield glass and said display means for forming an indication image of said indicated information having an object point therein, light beams from said object point impinging upon said inner and outer surfaces of the windshield glass to be reflected to form a virtual image in a doubled state at a finite distance outside the windshield glass, and said optical system forming said indication image beyond said display means to form an angle defined by said reflected light beams reflecting from said inner and outer surfaces thereof, which is smaller than a monocular resolving power. - View Dependent Claims (2, 3, 4, 5)
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Specification