Abstract: A projection display device includes an optical unit, a cooling fan for cooling the circumference of light valves of the optical unit, and an exterior cabinet accommodating the optical unit and the cooling fan. The cooling fan is in the form of a sirocco fan. Cooling air of the cooling fan is brought to the circumference of the light valves through a duct, and is distributed by air-quantity controlling means arranged in the duct for effective cooling thereof.

Abstract: A display apparatus of the projection type is improved in that, when a lamp valve breaks or is to be replaced, glass fragments and so forth thereof are prevented from being scattered into the inside of an outer housing of a projector apparatus through a cooling air intake port in a portion of the outer casing below the lamp valve and a comparatively small number of cooling fans are used to reduce the size and the weight of the overall display apparatus while optical modulation elements, a light source element and so forth can be forcibly cooled in a high efficiency. Cooling air blasted from an air blasting fan is blasted through an air blasting duct to three spatial optical modulation elements, a PS conversion element and a discharge lamp to forcibly air-cool the elements. A lamp box in which the light source is accommodated and which is removably mounted in an outer housing has a cooling air intake port through which cooling air is taken in to the light source.

Abstract: A projector device, which is simple and small and able to display images brighter and also able to improve the usefulness considerably. The effective reflecting lights of the mirror deflection type light modulators are focused into images at the position right in front of the projection lens, and the effective reflection lights are partly turned and focused on the two-dimensional position detector means for detecting the vertical and horizontal positions of the formed images.

Abstract: A glasses type head mounted display apparatus for seeing a virtual image through left and right lens systems provided with corresponding left and right display portions displaying left and right pictures, respectively. The display apparatus includes left and right slide mechanisms for moving the respectively left and right display portions on the main point axes of the lens systems and on segment lines through the central points of the left and right lens systems and focuses of the left and right lens systems so that the user sees through the left and right lens systems a virtual image synthesized with pictures of the left and right display portions.

Abstract: A disk magazine (1) for containing a plurality of disks (8) includes a detachable lid (4) for covering its disk outlet (2), enabling to take out the disks, a plurality of disk-pushing means (6) for pushing out the disks (8) one by one through the outlet (2). This prevents dust from entering or disks from popping out the magazine when the disk magazine (1) is not in use. A compact recording/reproducing apparatus provided detachably with the disk magazine (1) can be constructed if a single motor (85) is used to drive a pushing lever (87) for selectively thrusting the disk pushing means (6) to selectively push said disk (8) out of the disk magazine (1), and disk transfer means for loading the pushed disk (8) onto, or unloading it from, the recording/reproducing drive unit. A pushing lever (87) is connected to a press piece (107) which pushes portions (11a) of magazine slide levers (11) to be pushed, thereby causing discs to be pushed out of the magazine (1).

Abstract: A disk magazine (1) for containing a plurality of disks (8) includes a detachable lid (4) for covering its disk outlet (2), openable to take out the disks, a plurality of disk-pushers (6) for pushing out the disks (8) one by one through the outlet (2). This arrangement prevents dust from entering or disks from popping out of the magazine when the disk magazine (1) is not in use. A compact recording/reproducing apparatus provided detachably with the disk magazine (1) can be constructed using a single motor (85) to drive a pushing lever (87) for selectively thrusting the disk pushers (6) to selectively push disks (8) out of the disk magazine (1), and using upper and lower disk feed rollers for loading the pushed disk (8) onto, or unloading it from, a recording/reproducing drive unit.

Abstract: A 2-pyridyl-thiazolidin-4-one derivative represented by the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom, an C.sub.1 -C.sub.20 alkyl group, an C.sub.2 -C.sub.20 alkenyl group, an C.sub.2 -C.sub.20 alkynyl group, an aryl group, a C.sub.3 -C.sub.8 cycloalkyl group or an aralkyl group which may have a substituent, R.sub.3 is a hydrogen atom, an C.sub.1 -C.sub.20 alkyl group, an C.sub.2 -C.sub.20 alkenyl group, an C.sub.2 -C.sub.20 alkynyl group, a C.sub.3 -C.sub.

Abstract: A process for treating electric furnace dust comprising mixing electric furnace dust and a reducing agent with a material for reducing the slag melting point, preheating the mixture, adding the preheated mixture to molten slag which is being subjected to bubbling using oxygen-containing gas, heating the whole mixture, collecting volatilized material, and cooling the remainder.

Abstract: A disk loading device has a slide base driven by a driving motor, a first rotary unit rotatably mounted on the slide base, a second rotary unit similarly rotatably mounted on the slide base, means for biasing said first and second rotary units into rotation, guide means mounted parallel to the sliding direction of the slide base and operable to regulate the rotation of said first and second rotary units against biasing of said biasing means and allowing for movement of said first and second rotary units that are moved as one with said slide base, disk position control means mounted to the slide base and at a position facing to said first and second rotary units, and disk transport means mounted to the slide base and operable to transport the disk in a direction prependicular to the sliding direction of the slide base, said first rotary unit being rotated against said biasing means by the joint operation of the disk insertion and the disk position control means and returned under the control of said guide mean