Hitachi, Ltd.

Maxell, Ltd.

Hitachi Industry & Control Solutions, Ltd.

Hitachi Consumer Electronics Co., Ltd.

Hitachi Maxell, Limited

Other

Hiatchi, Ltd.

Hitachi, Ltd., and Hitachi Video and Information Systems, Inc.

Masahiko Yatsu

Koji Hirata

Takanori Hisada

Toshinori Sugiyama

Hidehiro Ikeda

Naoyuki Ogura

Yasuo Otsuka

Kazuomi Kaneko

Takesuke Maruyama

Tomohiro Miyoshi

Futoshi Yamasaki

Satoshi Ohuchi

Shigeki Hoshino

Taro Imahase

Shuji Kato

Hiroyuki Kajikawa

Yasuhiko Kunii

Naohiro Ozawa

Masaharu Deguchi

Takashi Kakuda

Yutaka Matsuda

Takuya Shiaki

Yuki Matsumiya

Satoshi Ouchi

Masayuki Fukui

Tsutomu Nakashima

Hiroyuki Nakamura

Nobuo Masuoka

Nobuyuki Kaku

Atsushi Ishibashi

Shigehisa Hagura

Takeshi Hoshino

Kenji Fuse

Makoto Fukatsu

Seiichi Sekiguchi

Mikiharu Kuwata

Nobuhiko Konuma

Hidetomo Yoshimura

Koichi Umezawa

Mikio Shiraishi

Shigeru Mori

Akio Misawa

Kazunari Nakagawa

Tomoki Yamamoto

Junichi Ikoma

Toru Numata

Shigeru Inaoka

Hironobu Satoh

Masanori Tsumura

Kayono Kimura

Shigeyuki Itoh

Hiroki Yoshikawa

Kenji Ogiro

Kenji Matsumoto

Yutaka Takami

Tetsu Ohishi

Iwao Aizawa

Masayuki Ohki

Takanori Nishiyama

Manabu Wakabayashi

Hiroshi Tomita

Yuki Nagano

Kei Adachi

Hiroto Takita

Kazuya Ozawa

Hiroshi Sasaki

Akira Arimoto

Yoshiho Seo

Nobuyuki Kimura

Satoshi Nakayama

Kazutaka Tsuji

Masahiro Yamamoto

Kenji Kobayashi

Hiroki Kaneko

Kenji Sano

Megumi Kurachi

Takashi Naitou

Tomoki Kobori

Kazuo Shikita

Katsuyuki Watanabe

Chohei Ono

Daisuke Imafuku

Tatsuya Ishikawa

Motoyuki Miyata

Takumi Nakada

Tetsuya Ohshima

Hiroyuki Akata

Osamu Ebina

Junichi Yokoyama

Tatsuya Nakazawa

Eiji Kawawa

Michiaki Abe

Masanori Takaji

An object of the present invention is to provide a vehicle that includes a display panel, a light source that irradiates light to the display panel, a first optical system that forms, onto a screen plate, a first optical image of a video on the display panel, and a second optical system that converts the first optical image into a second optical image that is a virtual image. The first and second optical systems are configured such that the first optical system's optical axis, at an incident surface side of the screen plate, is parallel to the second optical system's optical axis at an emission surface side of the screen plate. The first optical image formed on the screen plate is obtained by enlarging the video, and the virtual image is obtained by enlarging the first optical image formed on the screen plate by the second optical system.

Projection optical system and head-up display device and vehicle including projection optical system and head-up display device

The information display apparatus has a housing with an opening and a transparent cover formed on the opening, the housing includes image-light generating means configured to generate image light that displays the image information and an optical system configured to allow a driver of the vehicle to recognize image information based on the image light from the image-light generating means as a virtual image in front of the windshield. When S-polarized light on the windshield is assumed to be a first polarized wave while polarized light that orthogonally crosses the S-polarized light in a polarizing direction is assumed to be a second polarized wave, the image-light generating means is configured to generate the image light made of the first polarized wave, and a transmittance/reflectance control means blocks a part of the first polarized wave and the second polarized wave of incident external light entering the housing from the opening.

Vehicle

The information display apparatus configured to display video information of a virtual image on a reflecting surface of conveyance includes: a display configured to display the video information; and a virtual image optical system configured to display a virtual image at a front of the conveyance by reflecting light emitted from the display by means of the reflecting surface. The virtual image optical system includes a concave mirror and an optical element. The optical element is arranged between the display and the concave mirror, and is configured to correct distortion of the virtual image obtained so as to correspond to a viewpoint position of a driver on a basis of a shape of the concave mirror and a shape of the optical element. The information display apparatus further includes a virtual image double image conversion reducer configured to reduce double image conversion of the virtual image.

Information display apparatus

A head-up display apparatus includes a display panel configured to display an image, and a reflecting mirror configured to reflect light from the display panel. An optical distance between the reflecting mirror and the display panel is changed to continuously change a display position of a virtual image from a distant place to an adjacent position such that a virtual image obtained by being reflected at an upper portion of a windshield is formed farther than a virtual image obtained by being reflected at a lower portion of the windshield when viewed from a viewpoint position of a driver.

A HUD system and light source apparatus can be manufactured with miniaturization at low cost. A head-up display apparatus includes: an image display apparatus generating image light to be projected; an optical system performing predetermined correction to the image light emitted from the image display apparatus; and a concave mirror reflecting the image light corrected by the optical system to project it onto a windshield or combiner. The image display apparatus includes: a solid light source; a collimating optical system converting, into parallel light, the light from the solid light source; a lighting optical system configured by an optical member that polarizes a direction of a light beam generated by the collimating optical system and simultaneously expands a width of the light beam; and a display apparatus, the image display apparatus being configured to be arranged across and opposite the optical system on an optical axis of the concave mirror.

Head-up display apparatus and image display apparatus thereof

An object of the present invention is to provide a compact head-up display device. The head-up display device of the present invention includes an image forming unit that emits image light containing image information, and an eyepiece optical system that displays a virtual image by reflecting the image light, in which the eyepiece optical system includes a concave lens, a free curved surface lens, and a free curved surface concave mirror disposed in order from the image forming unit side along the emission direction of the image light.

Projection optical system and head-up display device

A small information display apparatus capable of displaying video information on a windshield as a virtual image is provided. An information display apparatus configured to display video information of a virtual image on a windshield of a conveyance includes: a liquid crystal panel arranged as a video display apparatus configured to form the video information; and a virtual image optical system provided with a windshield for displaying the virtual image at a front of the conveyance by reflecting video of the liquid crystal panel by means of the windshield. The virtual image optical system is configured by arranging a concave mirror and an optical element between the concave mirror and the video display apparatus.

A HUD device and an image display apparatus for solving a problem that a HUD image cannot be seen in a HUD device that displays a virtual image when wearing the sunglasses having polarization function are provided. A head up display device for a vehicle is provided with an image display apparatus configured to project an image onto a windshield or a combiner by polarized light and means of converting polarization of polarized light of the image projected from the image display apparatus, the means being provided on a part of a light path from the image display apparatus to the windshield or the combiner.

Head up display device and image display apparatus therefor

An information display apparatus and an information display method configured to display video information of a virtual image on a windshield of conveyance is provided. The information display apparatus includes: a display configured to display the video information; and a virtual image optical system configured to display a virtual image at a front of the conveyance by reflecting light emitted from the display by means of the windshield. The virtual image optical system includes a concave mirror and an optical element. A reflective film is formed on a reflecting surface of the concave mirror. A protective film for preventing moisture absorption is formed on a facing surface. By forming end surfaces of the two surfaces as a curved surface or an inclined surface and forming them on the end surfaces to block moisture, moisture absorption of plastic is prevented.

Information display apparatus and reflecting mirror used therein

A projection optical system includes an eyepiece optical system configured to refract and reflect a light emitted from an image forming unit for forming image information to display a virtual image, wherein the eyepiece optical system includes at least a concave lens, a folding mirror, and a concave mirror which are successively placed in order from the image forming unit including a liquid crystal display panel. The projection optical system configured as above is provided on a head-up display.

Projection optical system and head-up display

Growing community of inventors

Fujisawa, Japan

Masahiko Yatsu