Abstract: Disclosed is a digital micromirror device (DMD) based projector in which the position of a stylus with respect to a projected image can be determined automatically. In one embodiment, the stylus includes a detector capable of detecting illumination from a single pixel and the plurality of pixels in the DMD array are sequentially energized until a pixel reflects light to the stylus detector. Since the location of that pixel is known, the position of the stylus adjacent that pixel on the image is also known. In another embodiment, light is emitted from the stylus and the DMD array is sequenced in order to reflect light from the array to a photodetector. Again, when a pixel is sequenced so as to reflect light to the detector, the position of the stylus with respect to the image is related to the image of the pixel with respect to the pixel's location in the array.

Abstract: Disclosed is a method and apparatus for one or more operators to interact with a computer-controlled image projection-system. An operator-controlled radiation projector projects a beam of radiation which may be visible or invisible on the image created by the computer-controlled image projection system. A position sensing device determines the position of the projected radiation relative to the projected image and provides position information to the computer. In a preferred embodiment, the computer can then generate an additional image at or related to the spot of radiation permitting the operator to draw or paint pictures on the computer-projected image. In an additional preferred embodiment, the use of the position sensing device can be utilized to sense the position of a spot projected by one or more of a multiple gun projector which in a closed loop feedback loop can be used to control alignment of images projected by the multiple gun projector.

Abstract: Disclosed is a liquid crystal display unit comprising liquid twisted nematic liquid crystal material sandwiched between two polarizers. Transparent electrodes are provided on each side of the layer of liquid crystal for locally energizing liquid crystal material in the vicinity of two energized transparent electrodes. Polarized light passing through one polarizer is twisted or not twisted depending upon the energization state of the liquid crystal material and depending upon the second polarizer orientation does or does not pass therethrough. Accordingly, depending upon energization locations, images are formed which can be projected upon a screen. In preferred embodiments the liquid crystal display unit is used in conjunction with a cabinet to provide a low stress work station. A further embodiment includes a folded optical path in combination with the liquid crystal display so as to provide a compact projector.

Abstract: Meat portioning apparatus supports meat products on an endless conveyor to move through a light stripe at which upstream and downstream cameras view the light stripe and convert spaced apart points of light to electric signals representing various magnitudes of light brightness, the magnitude of brightness above a predetermined minimum representing areas of peripheral fat on the meat product. The electric signals of magnitude above the predetermined minimum are utilized by a computer to control one or more line-type cutters to cut the meat product along lines which remove the areas of fat from the meat product.

Abstract: Disclosed is a method and apparatus for one or more operators to interact with a computer-controlled image projection system. An operator-controlled radiation projector projects a beam of radiation which may be visible or invisible on the image created by the computer-controlled image projection system. A position sensing device determines the position of the projected radiation relative to the projected image and provides position information to the computer. In a preferred embodiment, the computer can then generate an additional image at or related to the spot of radiation permitting the operator to draw or paint pictures on the computer-projected image.

Abstract: Disclosed is a liquid crystal display unit comprising liquid twisted nematic liquid crystal material sandwiched between two polarizers. Transparent electrodes are provided on each side of the layer of liquid crystal for locally energizing liquid crystal material in the vicinity of two energized transparent electrodes. Polarized light passing through one polarizer is twisted or not twisted depending upon the energization state of the liquid crystal material and depending upon the second polarizer orientation does or does not pass therethrough. Accordingly, depending upon energization locations, images are formed which can be projected upon a screen. In preferred embodiments the liquid crystal display unit is used in conjunction with a cabinet to provide a low stress work station. A further embodiment includes a folded optical path in combination with the liquid crystal display so as to provide a compact projector.

Abstract: Disclosed is a liquid crystal display unit comprising liquid twisted nematic liquid crystal material sandwiched between two polarizers. Transparent electrodes are provided on each side of the layer of liquid crystal for locally energizing liquid crystal material in the vicinity of two energized transparent electrodes. Polarized light passing through one polarizer is twisted or not twisted depending upon the energization state of the liquid crystal material and depending upon the second polarizer orientation does or does not pass therethrough. Accordingly, depending upon energization locations, images are formed which can be projected upon a screen. In preferred embodiments the liquid crystal display unit is used in conjunction with a cabinet to provide a low stress work station. A further embodiment includes a folded optical path in combination with the liquid crystal display so as to provide a compact projector.

Abstract: The optical system projects discrete images in adjoining relation on a view screen to form a single image with substantial no illuminance discontinuity at the juncture of the images. A pair of afocal lenses split the light rays from a source for passage through segments of the lenses and each discrete image display. The light rays from the image displays are returned to an optical axis through a projection lens such that the adjoining margins of the images on the view screen pass along the optical axis of the projection lens.

Abstract: Disclosed is a liquid crystal display unit comprising liquid twisted nematic liquid crystal material sandwiched between two polarizers. Transparent electrodes are provided on each side of the layer of liquid crystal for locally energizing liquid crystal material in the vicinity of two energized transparent electrodes. Polarized light passing through one polarizer is twisted or not twisted depending upon the energization state of the liquid crystal material and depending upon the second polarizer orientation does or does not pass therethrough. Accordingly, depending upon energization locations, images are formed which can be projected upon a screen. In preferred embodiments the liquid crystal display unit is used in conjunction with a cabinet to provide a low stress work station. A further embodiment includes a folded optical path in combination with the liquid crystal display so as to provide a compact projector.

Abstract: Disclosed is a liquid crystal display unit comprising liquid twisted nematic liquid crystal material sandwiched between two polarizers. Transparent electrodes are provided on each side of the layer of liquid crystal for locally energizing liquid crystal material in the vicinity of two energized transparent electrodes. Polarized light passing through one polarizer is twisted or not twisted depending upon the energization state of the liquid crystal material and depending upon the second polarizer orientation does or does not pass therethrough. Accordingly, depending upon energization locations, images are formed which can be projected upon a screen. In preferred embodiments the liquid crystal display unit is used in conjunction with a cabinet to provide a low stress work station. A further embodiment includes a folded optical path in combination with the liquid crystal display so as to provide a compact projector.

Abstract: A machine and telephone controller for complex machine functions which is operated by simply looking at it and winking the eye in a preset code. Photocell and electronic logic circuitry stop a sequencing digital display at the desired numerals and activates the machine or telephone for the displayed number which may indicate either a function of a machine or a telephone number to be dialed.

Abstract: An improved oculometer yielding simplified data accumulation and reduction techniques because of the use of a cylindrical lens system which optically integrates the light reflected from the eye being studied. The use of the cylindrical lens system and a linear sensing element reduces the location data required by a factor of a square root and makes digital processing of the information practical.