Hitachi Consumer Electronics Co., Ltd.

Hitachi Maxell, Limited

Hitachi, Ltd.

Kazumasa Ueoka

Atsushi Ishibashi

Yoshihiro Iwama

Yuta Kawaguchi

Chohei Ono

Kazuomi Kaneko

Masayuki Ohki

Shinro Inui

Takafumi Ishizu

Shinji Matsumoto

Mikio Shiraishi

Minoru Ikeda

Takashi Yamamoto

Toshiyuki Moriya

Takeshi Saito

Sho Nozue

Kei Adachi

Fusamitsu Tsubata

Satoshi Nakayama

Hiroto Miura

Kazuo Shikita

Nobuyuki Honda

A projection image display apparatus capable of maintaining the positional accuracy of an integrator optical system even when subjected to an external force is provided. The projection image display apparatus includes an integrator optical system which converges and uniformizes a light emitted from a light source, a color separating optical system which separates the colors of the light emitted from the integrator optical system, a color synthesizing optical system which synthesizes lights separated by the color separating optical system, a projection optical system which emits the light, which has been synthesized by the color synthesizing optical system, onto a projection surface, a first optical case which fixes and houses the integrator optical system, the color separating optical system, and the color synthesizing optical system at respective predetermined positions, and a second optical case which fixes and houses optical components of the integrator optical system at predetermined positions, and the second optical case is attached to the first optical case.

Projection image display apparatus

Provided is a projection video display device with which precision of location of each component of the optical engine and the projection optical assembly is maintained and display video quality not impaired even if exterior force is sustained. A projection video display device comprises an optical engine () which projects light which is emitted from a light source () upon a liquid-crystal panel () and forms a video, and a projection optical assembly () which projects an enlargement of the video which is emitted from the optical engine (). The projection optical assembly () and the optical engine () are configured to be anchored to a common base () which retains these in an integrated manner, with the common base () being attached to the casing of the device.

Projection video display device

Projector

Video projector

Adjustment of the illumination range to a liquid crystal panel of a liquid crystal projector requires time in fixing upon adjustment and accordingly it is an object to make the adjustment effectively. In an adjustment mechanism of the illumination range of illumination means to the liquid crystal panel in an optical engine unit of the liquid projector, the spring property is provided in a lens holder for holding a lens and the lens is temporarily held by friction of the spring portion to the optical engine case after adjustment. Then, the adhesion processing is made to complete the adjustment.

Projection type image display with adjustable lens holding structure

Growing community of inventors

Yokohama, Japan

Kazumasa Ueoka