Yazaki Corporation

Fujitsu Corporation

Toshiaki Fujiwara

Masaya Sugita

Tsuyoshi Matsumoto

Yoshiyuki Furuya

Hirokazu Aritake

Masayuki Kato

Fumio Yamagishi

Tadashi Iino

Masato Nakashima

Junji Tomita

Takanori Watanabe

Kazuyuki Sasaki

Masao Suzuki

Hidenobu Korenaga

Koichi Takoa

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.

Headup display apparatus

A non-regular reflection type holographic mirror which can reduce, when mounted as a reflection plate on a windshield of a vehicle, the inclination of a display image visually discerned by reflection and a process of manufacturing the same. The holographic mirror comprises a hologram plate including a transparent support member and a photosensitive agent layer formed on the transparent support member and having interference fringes formed therein such that the hologram plate has a function of a concave mirror at a first portion of the hologram plate and another function of a convex mirror at a second portion of the hologram plate on opposite sides of a horizontal center line. A reflection type display apparatus for a vehicle employing a non-regular reflection type hologram or a regular reflection type hologram constituting a concave mirror as a hologram combiner wherein a virtual image of a display unit is reversed into an erect image and compensated for in contraction to improve the discernibility.

Non-regular reflection type holographic mirror and method of producing

Growing community of inventors

Shizuoka, Japan

Toshiaki Fujiwara