Abstract: An optical equipment having a discharge lamp for supplying light and a light value device for projecting the light from the equipment having an air intake opening arranged on one side of the equipment. A ventilation device is associated with the air intake opening so as to draw in air from outside of the equipment through the air intake opening and a ventilation path, including a plurality of air flow paths which are independent, respectively, and arranged from an outlet of the ventilation device to the light valves continuously. Ventilated air flows through the air flow paths so as to cool respectively different parts of the light valve device.

Abstract: The present invention relates to an information providing system. More particularly, this invention relates to an information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus. The information management apparatus comprises a main information reproducing means for reproducing main information recorded in a given recording medium; and a reproduction management means for managing the main information reproducing means for reproducing the main information. The present invention provides a receiving means provided with a means for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing means provided with a reproduction disabling means for limiting the reproduction of main information.

Abstract: The present invention relates to an information providing system. More particularly, this invention relates to an information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus. The information management apparatus comprises a main information reproducing means for reproducing main information recorded in a given recording medium; and a reproduction management means for managing the main information reproducing means for reproducing the main information. The present invention provides a receiving means provided with a means for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing means provided with a reproduction disabling means for limiting the reproduction of main information.

Abstract: A display optical unit includes a light valve which modulates light to form picture information, a light splitter which splits light into a plurality of color components and for directing each of the color components to the light valve, an illumination unit which directs light emanated from a light source to the light splitter, and a projection lens which magnifies and projects the modulated light having the picture information for displaying a picture. An optical axis of the projection lens is shifted from an optical axis of the illumination unit and the light splitter, and a projection lens unit including the light valve and the projection lens has a positioning mechanism which determines a position thereof when attached and is attachable and detachable in a direction perpendicular to an optical axis of the projection lens unit.

Abstract: A display optical unit and apparatus in which the optical axis of a projection lens is shifted from the optical axis of an illumination unit and light splitter. The projection lens is attachable and detachable in a direction in which the optical axes are shifted from each other. A light valve or a polarizer is cooled by cooling winds blown by a cooling device to the light valve or polarizer through a plurality of wind supply openings are arranged in directions different from one another and within the range of 45 degrees to 315 degrees so as to enable cooling of the display optical unit.

Abstract: An optical equipment having a discharge lamp for supplying light, and first, second and third light valves for projecting the light from the equipment, having an air intake opening arranged on one side of the equipment, a ventilation device associated with the air intake opening so as to draw in air from outside of the equipment through the air intake opening and a ventilation path arranged between an outlet of the ventilation device and the first, second and third light valves. The ventilation path includes a plurality of partition members which divide the ventilation path into first, second and third air flow paths so as to cool the first, second and third light valves respectively by air from the ventilation device.

Abstract: A liquid crystal projector comprises an illuminating optical system including a light source, a color separating optical system for separating illuminating light rays emitted by the illuminating optical system into light rays of three colors, a projection lens unit comprising a projection lens, a cross dichroic prism disposed near a light receiving end of the projection lens, and a plurality of liquid crystal panels arranged around the cross dichroic prism, and a light source power supply for supplying power to the light source. The projection lens unit, the color separating optical system, the illuminating optical system and the light source power supply are arranged in that order. The liquid crystal projector has an outside size in a horizontal plane of 263 mm by 318 mm or below. The liquid crystal panels have a display screen size of 0.9 in. A cooling fan for cooling the plurality of liquid crystal panels is disposed beside the projection lens.

Abstract: In optical equipment, such as a liquid crystal projector, a discharge lamp supplies light through a light valve device to project a light beam on a screen. A cooling system is provided to cool the light valve device, including a ventilation device, such as a centrifugal fan, for drawing in air through an air intake opening in the case of the optical equipment and an air flow path for supplying the drawn in air to the light valve device along plural paths. For this purpose, guide members are provided in the air flow path to divide and direct the air flow to individual parts of the light valve device along the plural paths.

Abstract: A liquid crystal projector comprises an illuminating optical system including a light source, a color separating optical system for separating illuminating light rays emitted by the illuminating optical system into light rays of three colors, a projection lens unit comprising a projection lens, a cross dichroic prism disposed near a light receiving end of the projection lens, and a plurality of liquid crystal panels arranged around the cross dichroic prism, and a light source power supply for supplying power to the light source. The projection lens unit, the color separating optical system, the illuminating optical system and the light source power supply are arranged in that order. The liquid crystal projector has an outside size in a horizontal plane of 263 mm by 318 mm or below. The liquid crystal panels have a display screen size of 0.9 in. A cooling fan for cooling the plurality of liquid crystal panels is disposed beside the projection lens.

Abstract: A first tape cassette adapted to be interchangeably used with a second tape cassette of a different thick case thickness is provided. A first tape cassette includes a first case having a first total thickness. The first case having a bottom face which is formed with an indentation and a first depression formed within the indentation. The indentation is used for positioning the cassette in a plane parallel to its bottom face. The second tape cassette includes a second case having a second total thickness that is smaller than the first total thickness of the first case. The second case has a bottom face which is formed with a second reference depression opened towards the bottom face. The second reference depression is for positioning the second tape cassette in a plane parallel to its bottom face.

Abstract: The present invention relates to an information providing system. More particularly, this invention relates to an information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus. The information management apparatus comprises a main information reproducing means for reproducing main information recorded in a given recording medium; and a reproduction management means for managing the main information reproducing means for reproducing the main information. The present invention provides a receiving means provided with a means for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing means provided with a reproduction disabling means for limiting the reproduction of main information.

Abstract: The present invention relates to an information providing system. More particularly, this invention relates to an information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus. The information management apparatus comprises a main information reproducing means for reproducing main information recorded in a given recording medium; and a reproduction management means for managing the main information reproducing means for reproducing the main information. The present invention provides a receiving means provided with a means for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing means provided with a reproduction disabling means for limiting the reproduction of main information.

Abstract: A cartridge changer having a predetermined width across a predetermined rotational plane, includes a rack being rotatable and storing at least first and second cartridges in a predetermined rotational plane, wherein at least one distance extending across the first and second cartridges in the predetermined rotational plane and through a rotational axis of the rack is greater than the predetermined width of the cartridge changer, and a rotator for rotating the rack in the predetermined rotational plane, so as to exchange a position of the first and second cartridges within the rotational plane without exceeding the predetermined width of the cartridge changer. The rotator more specifically performs a combination of rotation and shifting of the first and second cartridges with respect to one another within the rotational plane to accomplish exchange of the first and second cartridges within the rotational plane without exceeding the predetermined width of the cartridge changer.

Abstract: A tape cassette which can maintain stably the accuracy of the reference planes for determining the height of the tape cassette and which allows enhancement in accuracy of positioning, height positioning reference planes being provided inwardly a specified distance apart from an outside casing surface of the tape cassette such that the reference plane for determining the height of the tape cassette relative to the apparatus is not provided on the outside casing surface of the tape cassette, thus the reference planes remain free from contact with any mechanism for loading the tape cassette or with any foreign matter in transport, thus the reference planes can be kept free from damage.

Abstract: The present invention relates to an information providing system. More particularly, this invention relates to an information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus. The information management apparatus comprises a main information reproducing means for reproducing main information recorded in a given recording medium; and a reproduction management means for managing the main information reproducing means for reproducing the main information. The present invention provides a receiving means provided with a means for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing means provided with a reproduction disabling means for limiting the reproduction of main information.

Abstract: A magnetic tape recording and reproducing plug-in unit including a case with a front plate having an insertion opening through which a magnetic tape cassette is inserted, a bottom plate, a top plate, and a pair of side plates each formed with a pair of guide slots arranged for guiding the cassette to a loading position. The slide plates are attached to the side plates so as to be slidable within the case, each slide plate formed with a pair of cam slots arranged for moving the cassette to the loading position. A cassette holder is disposed inside the pair of slide plates for holding the cassette and has pins extending through the cam slots into the guide slots of the side plates. A recording and reproducing device is mounted on the bottom plate. A driving device drives the slide plates. An electronic circuit is disposed at the rear of the recording and reproducing device.

Abstract: A capstanless tape feed control system of a reel-drive type is capable of accurately detecting the respective working radii of a supply reel and a take-up reel and the total length of the tape, of efficiently controlling tape speed and of preventing damage to the tape. The tape feed control system calculates the working radii of the supply reel and the take-up reel and the total length of the tape while the leading end of the tape is moving toward the take-up reel, and detects tape speed on the basis of data representing the total length of the tape and the radius ratio between the supply reel and the take-up reel. The tension of the tape and the reel driving torque are detected while the tape is being fed and the working radii of the supply reel and the take-up reel are calculated on the basis of the tension and the reel driving torque.

Abstract: As a method of increasing the storage capacity of a magnetic recording and reproducing apparatus for recording and reproducing information to and from a magnetic tape in a cartridge, there is a helical scan recording method in which the magnetic tape is diagonally wound around a drum which rotates a magnetic head. With an apparatus adapted to this method, the disposition of the cartridge and the take-up reel for taking up the magnetic tape on the same plane arises a necessity of considerably bending the magnetic tape at the drum portion and, accordingly, the magnetic tape is damaged. In order to prevent the damage of the foregoing type, the tape passage surface from the cartridge to the drum and the tape passage from the drum to the take-up reel are formed by an angle at which the direction in which the magnetic tape is moved is changed due to winding of the magnetic tape around the drum so that the magnetic tape is not bent excessively.

Abstract: A cassette transport configuration provides a cassette insertion slot for introducing a cassette cartridge, guide rails for guiding and positioning each cassette cartridge and a plurality of cassette detecting elements for detecting the correct positioning of each cassette. The detecting elements are spaced apart on an upper inner portion of the insertion slot.

Abstract: A tape cassette which can maintain stably the accuracy of the reference planes for determining the height of the tape cassette and which allows enhancement in accuracy of positioning, height positioning reference planes being provided inwardly a specified distance apart from an outside casing surface of the tape cassette such that the reference plane for determining the height of the tape cassette relative to the apparatus is not provided on the outside casing surface of the tape cassette, thus the reference planes remain free from contact with any mechanism for loading the tape cassette or with any foreign matter in transport. Thus, the reference planes can be kept free from damage.