Nippon Avionics Co., Ltd.

Tomohide Inada

Sumiya Hobo

Hisao Takayama

Kazuaki Wakatsuki

Masao Kashiwada

Motoyuki Totsuka

Keisuke Akamatsu

Toshio Nara

Katsutoshi Umetani

Tsuneyuki Horii

Takao Hoshiai

A linear polarization/conversion apparatus includes a light source, a polarizing beam splitting means, first and second focusing lenses, and first to fourth total reflection mirrors. The light source includes a reflector having a paraboloid of revolution. The polarizing beam splitting means splits light from the light source into a linearly polarized transmission light component and a linearly polarized reflection light component. The first and second focusing lenses are respectively disposed to oppose exit surfaces, of the polarizing beam splitting means, from which the linearly polarized transmission and reflection light components emerge. The first and second total reflection mirrors are inclined at 45.degree. with respect to the exit surfaces, respectively, so as to totally reflect the linearly polarized transmission and reflection light components from the first and second focusing lenses. The third and fourth total reflection mirrors are respectively inclined at 45.degree. with respect to the reflection optical axes of the first and second total reflection mirrors to totally reflect the light, reflected by the first and second total reflection mirrors, in the same direction.

Linear polarization/conversion apparatus

A liquid crystal color projection apparatus includes a light source, dichroic mirrors, transmission type liquid crystal panels, a beam mixing section, two parallel side plates, and bar members. The dichroic mirrors separate light, supplied from the light source, into red, green, and blue beams. The transmission type liquid crystal panels are respectively arranged on the optical paths of the three color beams separated by the dichroic mirrors so as to form images corresponding to the three color beams. The beam mixing section mixes image beams from the transmission liquid crystal panels to reproduce a color image. The side plates have plural pairs of engaging portions, arranged at symmetrical positions, for fixing the dichroic mirrors and the liquid crystal panels at predetermined positions. Each of the bar members has two end portions fixed to one pair of engaging portions of the side plates, thus fixing and holding two arbitrary end portions of each of the dichroic mirrors and the liquid crystal panels thereon.

Liquid crystal color projection apparatus for modifying and projecting

An apparatus for measuring the three-dimensional position and attitude of upper and lower clutches attached on patient's maxillary and mandibular teeth for computerized measurement of the mandibular movements necessary for the fabrication of dental prostheses is disclosed. The apparatus includes a part of a sphere that is fixed to the mandible and which is marked with a reference line and a part of another sphere of substantially the same radius as that of the above sphere, which is fixed to the maxilla and which is also marked with a reference line. The surfaces of the two spheres are caused to slide against each other, with their centers being in alignment, thereby achieving the measurement of the relative attitude of the two spheres.

Apparatus for determining the three-dimensional position and attitude

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Tokyo, Japan

Tomohide Inada