A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system, and requires less space to mount. Rays of light emitted from a light valve of the project are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays p...

The projector has an essentially afocal projection system, in particular for the reproduction of three-dimensional images. This system has a system of convex lenses (1) on the side of the object and a Fresnel lens (2) on the side of the image. The lenses are larger than the transverse dimension of the object to be reproduced. By providing a double reflection (3, 4), this projection system is able to generate, in addition to the reproduction of two-dimensional images, a three-dimensional image of...

Light pre-polarized in a particular plane is divided into a plurality of paths, where each path includes a reflecting mirror, a dichroic mirror and a liquid crystal display. The light in each display is selectively modulated and combined for projection purposes. The displays are rubbed in directions coordinate with the display peripheries to enhance the contrast of the light passing through the display.

A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system, and requires less space to mount. Rays of light emitted from a light valve of the projector are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays...

A projector includes a plurality of cabinets arranged in rows and columns and each of the cabinets has a screen located at its front end with a plurality of the screens being adapted to collectively form a large display screen on which an image is formed. The cabinet further includes a screen a screen frame for holding edges of the screen, a screen holder, which is secured to the screen by the screen frame, a screen bracket for mounting the screen holder to the cabinet, a mechanism for securing ...

A projector has projecting optical systems. The projecting optical systems have image formers and projecting lenses for projecting the images onto a screen. The optical axes of the projecting lenses are intersected with each other on the side of the screen. The image formers are arranged such that an image surface of each image former is coincident with the screen in accordance with Scheimpflug's rule.

A projector having a light valve which operates by alternatively transmitting incident light or scattering such light has adjustable illumination and projection apertures to maximize contrast ratio and brightness according to ambient light conditions.

A projector including a non-polarized light source, a polarizing beam-splitter receiving light from the non-polarized light source and a selectably actuable polarization rotating light valve having light polarized in one sense from the polarizing beam-splitter impinging thereon from a first direction and having light polarized in an opposite sense from the polarizing beam-splitter impinging thereon from a second direction.

A projector for magnifying and projecting an image displayed on LCDs and illuminated by a light source through a projecting lens is designed so that the adherence of dust to the LCDs and the rise of the temperature of the LCDs is suppressed. The peripheral portions of the LCDs are supported by supporting frames. And, the LCDs are hermetically held by a front side glass and a rear side glass which are closely mounted to the peripheral portions of the supporting frames with an adhesive.

A projector which projects a flat picture or image in a horizintal plane onto a vertical screen. Because the projection optic used is arranged above one corner of a four cornered picture and can be rotated about a vertical axis the projector can be placed not only on one side of the projected picture, which is thus not obstructed by the projector and it's operator, but alternatively to the either side thereof. The picture can be square or rectangular. The invention can be applied both with overh...