The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1996
Filed:
Mar. 17, 1994
Kohki Oikawa, Omiya, JP;
Tomonari Ishikawa, Omiya, JP;
Kansei Corporation, Omiya, JP;
Abstract
The present invention provides an apparatus for a head up display for the use of a motor vehicle, which can make a presentation of an image information in a remote place and which can remove a height-wise positional displacement of a double image and distortion of the double image caused by the curved shape of a vehicle front glass to the extent possible. In the apparatus for a head up display for the use of a motor vehicle according to the present invention, a projector (3) has a middle mirror (6) for reflecting an image information (9) such as characters or marks toward a reflective face. The middle mirror (6) includes a portion (18) of the parabolic reflective face which is located away from a main axis of a parabolic mirror. The portion (18) of the parabolic reflective face includes a first curved surface having a small curvature, corresponding to that portion of a vehicle front glass (2) which has a large curvature, and a second curved surface having a large curvature, corresponding t that portion of the vehicle front glass (2) which has a small curvature, so that distortion of the image information due to difference in curvature of the vehicle front glass (2) is corrected and a height-wise positional displacement of a double image, which may occur when the image information is looked through a pair of eyes (10) and (11) of a person riding on the motor vehicle, is corrected.