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:
Mar. 05, 1996
Filed:
Dec. 05, 1994
Masayuki Kato, Kanagawa, JP;
Hirokazu Aritake, Kanagawa, JP;
Tsuyoshi Matsumoto, Kanagawa, JP;
Junji Tomita, Kanagawa, JP;
Fumio Yamagishi, Kanagawa, JP;
Masato Nakashima, Kanagawa, JP;
Masao Suzuki, Shizuoka, JP;
Toshiaki Fujiwara, Shizuoka, JP;
Masaya Sugita, Shizuoka, JP;
Koichi Takoa, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A headup display apparatus consists of a projection optical system unit installed in the dashboard of a car and a reflection member on the windshield. The projection optical system unit contains an indicator and an off-axis reflective hologram which reflects display light of the indicator toward the windshield, which in turn reflects it toward the viewing point of a driver. As a result, the display is seen superimposed on the exterior view. When external light as from the sun enters the projection optical system unit traveling in a direction reverse to the path of the display light, the off-axis reflective hologram reflects the incident external light toward a direction different from that of the outgoing display light to minimize an abnormal illumination of the indicator surface which would otherwise render the display unrecognizable. Behind the hologram is installed a heat dissipating member that receives infrared rays that have transmitted the hologram in order to dissipate heat.