Kabushiki Kaisha Toshiba

Toshiba Medical Systems Corporation

Masaru Kitamura

Yoshinori Honguh

Yasuo Saito

Masahiko Yamazaki

Shuya Nambu

Masaharu Shimizu

Yasutada Nakagawa

Hisayuki Mihara

Machiko Iso

Hideki Ide

Kenji Igarashi

Katsuya Yamada

Shigeru Sakuta

Yuzuru Takashima

Akiji Wakabayashi

Tsuguo Kishi

Ryuhachiro Doji

The angle of each collimator plate with respect to an X ray focal point is determined by fitting the collimator plate in grooves formed in upper and lower supports each having an integral structure. In addition, the warpage of each collimator plate is corrected and its flatness is maintained by fitting the periphery of the collimator plate which is on the X ray detector side in a corresponding groove of an abutment plate provided on the X ray detection surface side of the upper and lower supports. Furthermore, each collimator plate is supported by the corresponding grooves of the upper and lower supports and the corresponding groove of the abutment plate on at least three sides.

X-ray CT apparatus collimator, method of manufacturing the X-ray CT apparatus collimator, and X-ray CT apparatus

A projection type image display apparatus for projecting an image onto a screen includes a light source, a beam shape converter, a beam divider, a beam superimposer, a processing unit, and a projection lens. In operation, the light source emits a light beam. The beam shape converter converts a sectional shape of the light beam into a different shape. For example, the beam shape converter can convert a circular cross section into a rectangular cross section. The beam divider then spatially divides the converted light beam into plural light beams. The beam divider can include, for example, a first prism array that divides the converted light beam horizontally and vertically into four beams. The beam superimposer superimposes the plural light beams onto a target surface, such as a liquid crystal panel. The beam superimposer can include, for example, a second prism array and a beam collimator that superimpose the plural light beams on the target surface. The processing unit supplies a signal so as to display an image on the target surface. The projection lens projects the image onto the screen by the superimposed beam. This apparatus can improve the uniformity of illuminance distribution and the light utilization efficiency, while maintaining high directivity of light.

Illumination apparatus and a projection type image display apparatus using it

Growing community of inventors

Yokohama, Japan

Masaru Kitamura