1
Takahoko Yoshida, Masayuki Muranaka, Hiroki Yoshikawa, Koji Hirata, Isao Yoshizaki, Masakuni Teratani, Nobuhiro Konuma: Rear projection screen and method of producing the same. Hitachi, Antonelli Terry Stout & Kraus, November 19, 1991: US05066099 (75 worldwide citation)

A rear projection screen for use in a rear projection image display device comprises one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, the last sheet member comprising a transparent material as a base thereof, and a light d ...


2
Atsuo Osawa, Hiroki Yoshikawa, Shigeru Mori, Naoyuki Ogura: Projection lens and image display device. Hitachi, Mattingly Stanger & Malur P C, October 10, 2000: US06130786 (40 worldwide citation)

An image display device which is compact on the whole and low in cost, and which uses a plurality of projection lens systems each of which is constituted by five lens groups including a first aspherical lens group, a second aspherical lens group, a third biconvex lens group, a fourth aspherical lens ...


3
Koji Hirata, Takahiko Yoshida, Hiroki Yoshikawa, Masayuki Muranaka, Atsuo Osawa, Yutaka Matuda: Rear-projection type image display apparatus and rear-projection type screen. Hitachi, Antonelli Terry Stout & Kraus, January 16, 1996: US05485308 (36 worldwide citation)

A rear-projection screen for a rear-projection image display apparatus comprises a Fresnel lens sheet, a first lenticular lens sheet, and a second lenticular lens sheet or a Fresnel lens sheet, first and second lenticular lens sheets and a light absorbing sheet. A light entrance surface of the first ...


4
Tetsu Ohishi, Takahiko Yoshida, Hiroki Yoshikawa, Yutaka Matsuda, Hideo Tanide, Shigeru Mori, Atsuo Osawa, Koji Hirata: Multi-display apparatus. Hitachi, Antonelli Terry Stout & Kraus, July 20, 1999: US05926153 (27 worldwide citation)

A multi-display apparatus includes a plurality of rear projection-type display devices each in which projection light from image sources is projected through projection lenses onto a rear projection surface of a rear projection screen to form a picture image on a front viewing surface of the rear pr ...


5
Takahiko Yoshida, Koji Hirata, Hiroki Yoshikawa, Masayuki Muranaka, Isao Yoshizaki, Atsuo Osawa: Rear-projection screen and a rear projection image display employing the rear-projection screen. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, March 21, 1995: US05400114 (24 worldwide citation)

A rear-projection screen for a rear-projection image display comprising a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface ...


6
Takahiko Yoshida, Koji Hirata, Atsuo Ohsawa, Kiyoshi Wada, Hiroki Yoshikawa: Rear projection type image display apparatus and transmission type screen used therein. Hitachi, Antonelli Terry Stout & Kraus, March 25, 1997: US05613748 (22 worldwide citation)

A transmission screen for a rear projection type image display apparatus having at least one image generation source for displaying images, at least one projection lens for enlarging and projecting images displayed on the at least one image generation source onto a rear portion of the transmission s ...


7
Takahiko Yoshida, Koji Hirata, Atsuo Osawa, Kiyoshi Wada, Hiroki Yoshikawa: Rear projection type image display apparatus and transmission type screen used therein. Hitachi, Antonelli Terry Stout & Kraus, January 7, 1997: US05590943 (20 worldwide citation)

A transmission screen for a rear projection type image display apparatus having at least one image generation source for displaying images, at least one projection lens for enlarging and projecting images displayed on the at least one image generation source onto a rear portion of the transmission s ...


8
Takahiko Yoshida, Hiroki Yoshikawa, Shigeru Mori, Koji Hirata, Tooru Numata, Isao Yoshizaki, Mitsuo Okimoto: Optical system for projection type image display device. Hitachi, Antonelli Terry Stout & Kraus, April 7, 1992: US05103302 (20 worldwide citation)

A projection type image display device provided with three projecting lenses projecting light emitted by cathode-ray tubes of different colors, red, green and blue, on a screen while enlarging an image is disclosed, in which clapper plates are disposed preferably in front of the red and the blue ima ...


9
Akio Sakazume, Hiroki Yoshikawa, Hiroaki Matsushima: Control system for compressor motor used with air-conditioning unit. Hitachi, Antonelli Terry & Wands, January 27, 1987: US04638643 (20 worldwide citation)

A control system for a compressor motor used with an air conditioning unit is disclosed. A current for generating a non-rotating magnetic field is supplied to the compressor motor to preheat a compressor. A current for generating a rotating magnetic field is also supplied to the compressor motor tog ...


10
Takahiko Yoshida, Koji Hirata, Hiroki Yoshikawa, Masayuki Muranaka, Isao Yoshizaki, Atsuo Osawa: Rear-projection screen and a rear projection image display employing the rear-projection screen. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, April 30, 1996: US05513037 (19 worldwide citation)

A rear-projection screen for a rear-projection image display comprises a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface ( ...