Abstract: A motion picture projector is provided with a manually shiftable mode controller assembly for selecting various operational modes and apparatus for the automatic threading and rewinding of film. The operative mechanical components of the projector are mounted on a unitarily molded housing including molded structures and portions that independently and cooperatively with other control assemblies and interfitting structures provide features and improved operational characteristics. The molded housing interfits with a take-up reel cover, a control assembly cover and a rear cover that rotatably engages a carrying handle. Structure to define a film path, an automatic threading assist structure, a film speed detent structure and a position defining structure for the mode controller assembly are also provided by and integrally molded with the housing.

Abstract: For use in a sound motion picture camera adapted to handle both sound and lent film and having a driven capstan at the sound station thereof, the capstan drive motor is used to power a driven component of an automatic focusing system by which a focusable objective lens can be focused automatically on a remote subject. By a control switch, associated with the camera operation control member, either manual or automatic focusing modes can be selected, the automatic mode being further selectable as being continuous during film transport operation or limited to a period before film transport operation begins.

Abstract: Disclosed is a blower assembly for use in dispersing heat from an image projector with minimum air flow noise by interposing a constant torque clutch formed of a dual wound spring between the blower and a motor output drive to permit the rate of rotation of the blower to vary in response to variations in air weight due to changes in temperature, atmospheric pressure, and moisture content.

Abstract: A pinch roller actuating device for a sound motion picture camera including portion connected to a rotatable pinch roller to maintain the roller out of and in engagement with a capstan responsive to a movable camera actuating member having a limiting stop which defines the maximum displacement of the actuating member. A spring member is provided to move the pinch roller into engagement with the capstan after the actuating member is displaced beyond its mid-point. A bracket is arranged to prevent movement by the spring when the stopper engages the connecting portion, and instantly engages the pinch roller with the capstan by being suddenly moved by the spring member when the connection between the stopper and the connecting portion is released.

Abstract: A chromatically neutral viewfinder optical system of positive forward and rearward elements and including therebetween a substantially zero power doublet which neutralizes chromatic errors generated by the positive elements.

Abstract: A control for varying the speed of advancement of film is described for use in a film projector in which the film is advanced by a shuttle tooth which engages perforations in the film and advances the film along a path between a light source and a projector aperture. The control includes a rotary shutter assembly having one or more shutter blades for interrupting the light from the light source. As the shutter assembly rotates, the shuttle tooth is reciprocated in the direction of film feed by a rotary cam having one or more cam lobes mechanically coupled to the shuttle tooth. The rotation of the cam lobes is synchronized to the rotation of the shutter blades such that the shuttle tooth is positioned for engagement with the perforations associated with the next successive film frame to be projected whenever a shutter blade interrupts the light source.

Abstract: The disclosure relates to a fade circuit for a motion picture camera of the type which includes an automatic exposure control. The fade circuit includes a light emitting diode which illuminates the light sensitive device of the automatic exposure control to augment the ambient light levels normally received by the light sensitive device. The intensity of the light emitted by the light emitting diode is controlled by a variable current source which provides the light emitting diode with continuously increasing or decreasing current for increasing or decreasing the intensity of the light from the light emitting diode. Fade-in is obtained as the light intensity of the light emitting diode is gradually decreased from an initial intensity sufficient to close the diaphragm opening to zero intensity to allow the diaphram to assume an opened condition corresponding to ambient light levels.

Abstract: This invention relates to an objective optical sub-system having fewer elements and improved performance specifications as compared to an objective it will replace.

Abstract: To eliminate the recording of undesirable sounds which can occur upon stang a sound motion picture camera in which sound is recorded simultaneously as the picture is recorded, a circuit shorting switch is installed in parallel with the sound recording head, and a film transport motor control switch is arranged to function opposite to the circuit shorting switch but in cooperation with that switch to stabilize the amplifier before film movement begins.

Abstract: This invention relates to a large aperture optical system of short focal length primarily intended for efficiently transmitting monochromatic light rays in optical instruments with an extraordinarily high degree of correction over a prescribed field.

Abstract: A lens system primarily for a copier is a plastic and glass lens design of reflex configuration enabling lower manufacturing cost with a higher degree of optical correction than a comparable all glass straight through design of similar optical characteristics. In the preferred embodiment, the plastic element is formed with aspheric surfaces.

Abstract: Disclosed is an optical design for a variable focal length lens of large effective aperture which is focusable over an extended range including the "macro" range and is provided with a high degree of correction.

Abstract: A lens system primarily for a copier is a reflex, plastic and glass lens design enabling lower manufacturing costs with a higher degree of optical correction than a comparable all glass straight through design of similar optical characteristics. In the preferred embodiment, selected of the plastic elements is formed with aspheric surfaces.

Abstract: A photographic objective comprises a plurality of lens elements, the outer two of which are adjustable axially by a small amount for fine adjustment of the focal length of the lens system to permit matching mass produced lens systems in pairs so that the focal lengths of every pair of such lenses can be adjusted within very close tolerances.

Abstract: An optical system for an eyepiece designed primarily to be used to observe an image formed by an optical instrument, such as an image intensifier, when viewing scenes under adverse or low light conditions. The system is designed with fewer elements than comparable designs of similar optical performance, and in the embodiments shown, five elements provide the required correction for high quality imaging of the viewed scene.

Abstract: A motion picture camera for simultaneous recording of picture and sound is provided with a starting and stopping device for controlling film transport mechanisms and displacing same into and out of operative orientation with the film as the camera is actuated and deactuated wherein the size of the film loop is maintained substantially constant before or after and during camera operation.

Abstract: An economical optical system without elements of more exotic optical materials for imaging light rays from an ultra-violet or near ultra-violet light source of an optical instrument.

Abstract: An economical optical system for imaging light rays from a near ultra-violet light source of an optical instrument without elements of special optical materials.

Abstract: For driving exposure control vanes in photographic equipment in response to ariations in the quantity of light, a moving magnet type instrument has a magnet which is positioned proximate a fixed field coil wound on a two piece frame. The magnet is formed as a unitary component of magnetic material and plastic material interlocked against separation, and is arranged for displacement in bearings in the frame proximate which a magnet biassing material is arranged to urge the magnet into a position whereby the supported vane is maintained at a relatively constant spacing with respect to a fixed camera component.

Abstract: A film cartridge designed for permanent mounting on a movie projector having an automatic feed mechanism. The cartridge includes a generally rectangular housing for enclosing the entire film reel. A reciprocating spindle is slidably mounted by a pair of pins to captivate the film reel in an approximately precise orientation to permit the automatic feed mechanism to strip the leading edge from the reel and guide the leading edge into the machine. The reciprocal movement of the spindle is accomplished by a cam slot provided in a sliding cover permitting the insertion and removal of film reels without the expense of a cassette for each reel.