Hitachi, Ltd.

Other

Hiatchi, Ltd.

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

Yasuo Otsuka

Masahiko Yatsu

Mikio Shiraishi

Takesuke Maruyama

Tomohiro Miyoshi

Satoshi Ohuchi

Nobuyuki Kaku

Kenji Fuse

Taro Imahase

Toru Numata

Hidehiro Ikeda

Koji Hirata

Naoyuki Ogura

Shigeru Mori

Tohru Sasaki

Naohiro Ozawa

Nobuhiro Katase

Atsushi Ishibashi

Shigehisa Hagura

Takeshi Hoshino

Futoshi Yamasaki

Masaharu Deguchi

Takashi Kakuda

Makoto Fukatsu

Yutaka Matsuda

Seiichi Sekiguchi

Takuya Shiaki

Mikiharu Kuwata

Koichi Umezawa

Nobuhiko Konuma

Hidetomo Yoshimura

Akira Shimizu

Kazunari Nakagawa

Shigeru Inaoka

Kazutaka Sato

Michihiro Watanabe

Taisaku Seino

Hideyuki Kawase

Kazutoshi Konno

Hiromitsu Fukuda

Youichi Narui

Masahisa Aoyagi

Katsuo Ohki

Tsuguo Suzuki

Kimio Oga

Michio Miura

Yasuyuki Kojima

Hiroshi Minoda

Toyota Honda

Kichizaemon Okazaki

Toshio Tanizoe

Akihiko Asada

A projection type display apparatus includes a housing having a first side on which an air intake opening is arranged and a second side on which an air exhaust opening is arranged, a light source for supplying light, and a light valve device which modulates the light output from the light source. A first fan is provided which draws air from the air intake opening into the housing, and a first ventilation path is coupled with the air intake opening so as to lead air flow from the air intake opening toward a lower portion of the light valve. A second ventilation path is formed from the lower portion of the light valve to an upper portion of the light valve, and a second fan is provided which draws out air flowing from the second ventilation path through the air exhaust opening to outside of the housing.

Optical equipment with at least first and second ventilation paths

Projection type display apparatus with ventilation

The present invention discloses the structure of the array lens that at least any one of the diagonal size, vertical size and lateral size of lens cell is set to almost 1/(4.5 or more) for each corresponding size of the display elements, the structure that the diagonal size of lens cell is set to almost 0.18 inch or less, the structure that the total number of lens cells is set to almost 240 or more and the structure that the lens focal distance of lens cell is set to almost 30 mm or less.

Optical unit and image display apparatus

A projection type display apparatus includes a housing having a first side having an air intake opening and a second side having an air exhaust opening, a light source for supplying light, and a light valve device which modulates the light output from the light source. A centrifugal fan is associated with the air intake opening so as to draw air from the air intake opening. A first ventilation path is coupled with the air intake opening so as to lead air flow from the air intake opening toward a lower portion of the light valve, and a second ventilation path is formed from the lower portion of the light valve to an upper portion of the light valve. An exhaust fan is associated with the air exhaust opening so as to draw out air flowing from the second ventilation path through the air exhaust opening.

Projection type display apparatus

A liquid crystal projector comprises an illuminating optical system including a light source, a color separating optical system for separating illuminating light rays emitted by the illuminating optical system into light rays of three colors, a projection lens unit comprising a projection lens, a cross dichroic prism disposed near a light receiving end of the projection lens, and a plurality of liquid crystal panels arranged around the cross dichroic prism, and a light source power supply for supplying power to the light source. The projection lens unit, the color separating optical system, the illuminating optical system and the light source power supply are arranged in that order. The liquid crystal projector has an outside size in a horizontal plane of 263 mm by 318 mm or below. The liquid crystal panels have a display screen size of 0.9 in. A cooling fan for cooling the plurality of liquid crystal panels is disposed beside the projection lens.

Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same

A projection type display apparatus including a discharge lamp for supplying light, a light valve device and first and second air intake openings arranged on different sides of the apparatus. A centrifugal fan is associated with the first air intake opening so as to draw in outside air and form a first ventilation air flow from the first air intake opening through a lower side of the light valve device so as to cool the light valve device. A fan is associated with the second air intake opening so as to draw in outside air and form a second ventilation air flow so as to cool optical elements including lenses. An exhaust opening is arranged on a further side of the apparatus, and an exhaust is fan arranged proximate to a discharge lamp so as to draw out air including the first and second ventilation air flow therethrough.

Optical apparatus

In order to prevent dust from sticking to the LCD panel, to prevent the LCD panel from being heated and to suitably adjust the position of the LCD panel, a duct is provided between cooling means for a light source and cooling means for a LCD panel to send cooling air from the LCD panel side to the light source side. Therefore, a light incidence/reflection plane of the LCD panel is disposed in an almost hermetically closed space and an optical path from an integrator lens to the LCD panel is formed in the almost hermetically closed space.

Image display mechanism and image display device

An optical equipment having a discharge lamp for supplying light and a light valve device for projecting the light from the equipment having an air intake opening arranged on one side of the equipment. A ventilation device is associated with the air intake opening so as to draw in air from outside of the equipment through the air intake opening and a ventilation path arranged so as to extend from an outlet of the ventilation device continuously. The ventilation path includes a partition member proximate to an outlet of the ventilation device and air flow through the ventilation path is divided into a plurality of air flows by the partition member so as to cool different parts of the light valve device respectively.

For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element for converting light from a light source into display picture depending on a driving signal; an optical projection system containing a first optical element and for projecting said light signal toward an object of projection; exit side polarizing elements ; a holding member for holding them with the liquid crystal display element ; and cooling medium incident side polarizing elements , wherein, a space is defined by either one of the incident side polarizing elements and the liquid crystal display element , the first optical element , between the liquid crystal display element and the first optical element , and the holding member , and said space is filled up with the cooling medium

Liquid crystal display apparatus and optical device for use therein

The present invention discloses the structure of the array lens that at least any one of the diagonal size, vertical size and lateral size of lens cell is set to almost 1/(4.5 or more) for each corresponding size of the display elements. The diagonal size of lens cell is set to almost 0.18 inch or less. The total number of lens cells is set to almost 240 or more. Finally, the lens focal distance of lens cell is set to almost 30 mm or less.

Array lens, lighting optical system, optical unit and imaging apparatus

Growing community of inventors

Chigasaki, Japan

Yasuo Otsuka