Abstract: This type of electrophotography is practiced using a device comprising a holder, a photographic film mounted in the holder, and a light-tight sleeve connected to the holder to enable an object to be placed in contact with the film. An electrode is disposed inside the holder on the opposite side of the film from the object under investigation. A pulse generator capable of producing high voltage pulses having a high-frequency component is connected to the electrode.

Abstract: A shutter of a camera having an opening member for opening a shutter aperture and a closing member for closing the aperture. The focal plane shutter shields the aperture from light by both the opening member and the closing member immediately after termination of film exposure.

Abstract: An improved apparatus for photographing body cavities having an apparatus for photographing cavities of the body having a pair of tubular cameras, each containing a film-holding spider; a lighting element intermediate said cameras having a filament producing a glow discharge upon application of current; a tubular shutter slidably enclosing said cameras; means to move said cameras axially of said tubular shutter to permit exposure of said film in said spiders; and means to supply air to said apparatus and to expel air into a body cavity, the improvement comprising means to supply a safe level of current to said lighting element.

Abstract: A camera can create a combined image on the film with two different light sources, and it comprises a slide projecting device mounted between the camera lens and the camera body. Upon inserting a mask and a slide transparency into the slide projecting device, the subject image on the slide will be projected and merged with external image coming through the camera lens to form a combined image on the film without using darkroom montage technique or photo studio facilities; it is particularly useful and convenient for a sight-seeing traveller to put his (or her) own portrait against a landscape or architecture background without bothering other people to take a picture for him (or her) or using a tripod.

Abstract: Disclosed is a variable magnification image formation apparatus wherein an image of an original is formed on a photosensitive member by the use of a zoom lens assembly of the type in which the focal length is changed by rotating a zoom ring about the optical axis and wherein the zoom ring is rotated by wire in synchronism with movement of the zoom lens assembly.

Abstract: In one embodiment of the invention, a first elongate member is slidably associated with a second elongate member, and the second member is extendable relative to the first member. The second elongate member is arrestable and securable in various positions relative to the first member.An angle-shaped camera support has tubular members attached to each leg of the support, and selectively each tubular member slidably receives the second elongate member. A camera is mountable on one leg of the support and may be releasably arrested and as desired secured releasably in various locations on the second elongate member.In another embodiment of the invention, a main body portion has an extending arm to which is pivotably mounted a camera support shelf. The main body portion is slidable upon the second elongate member, and it is releasably arrestable and securable as desired in various positions on the second elongate member.

Abstract: A display device in a view finder of a camera includes an illumination light source for illuminating the display portion and an illumination light leading body. The body has a reflecting surface and two permeable surfaces having such a refracting force such that the light emitting portion of the illumination light source is almost conjugate with the position of the pupil while observing the image in the view finder. The apparatus is arranged in such a manner that the illumination light beam is incident upon the one permeable surface of the illumination light leading body and goes out at the other permeable surface so as to illuminate the display portion. Accordingly, the display portion is observed together with the image in the view finder.

Abstract: An ear defender for a headset, the ear defender comprising a rigid shell having holes in a central portion to permit the passage of ambient sound and including a valve mechanism to close the holes as required. The shell consists essentially of a unitary construction, being formed as a one-piece moulding. The valve mechanism consists of a fixed plate and sliding plate both of which have holes which can be aligned to open the valve or misaligned to close the valve. The valve is mounted wholly within the shell so providing protection for the valve mechanism. Access to the valve and to other components within the shell is thus provided entirely from one side of the shell.

Abstract: In the disclosed camera an electromagnetic device serves to actuate a shutter release mechanism, and a drive is arranged repeatedly to drive the electromagnetic device following a shutter release signal to permit sequential control of a plurality of actions such as a shutter release, a mirror dropping action, a film winding lock release action, etc. with a single electromagnetic device.

Abstract: A dual lens camera having a relatively long focus lens and a relatively short focus lens either one of which is selected for telephotographing and wide angle photographing is provided with a movable mirror and an exposure aperture located behind the short focus lens, and a fixed mirror located behind the long focus lens with an angle of inclination more than a right angle relative to the optical axis thereof. Upon wide angle photographing, the light passed through the short focus lens can travels straightly to the exposure aperture. When selecting the long focus lens to effecting telephotographing, the movable mirror is pivoted to position in front of the exposure aperture so as to reflect the reflected light by the fixed mirror and thereby organize a Z-shaped optical path for the long focus lens. Simultaneously, the short focus lens is shifted in the direction perpendicular to the optical axis thereof for the purpose of the pivotal movement of the movable mirror without any interference therewith.

Abstract: An exposure control shutter of a camera having an exposure opening, comprising first and second plane shutter blades, each shutter blade having a relatively large aperture and a relatively small aperture. The first and second shutter blades, one being disposed top of the other, are slidingly movable with respect to each other from a neutral position in which the camera exposure opening is closed to either a first exposure position in which the relatively large apertures of the first and second shutter blades meet in the camera exposure opening to define a low-speed, large-aperture-size exposure or a second exposure position in which the relatively small apertures meet in the camera exposure opening to define a high-speed, small-aperture-size exposure. A spring is provided for biasing the first and second shutter blades to maintain them in the neutral position.

Abstract: A camera loading door interlock which is simple and inexpensive, and yet which assures the proper loading/unloading sequence for a disk-type camera in which the film cartridge incorporates a dark slide which must not be opened before the camera loading door is securely closed, and which must be closed before the camera loading door is opened.

Abstract: Disclosed is an exposure amount control device for a copying machine comprising an exposure amount control circuit for controlling an exposure amount by controlling light of the exposure lamp for illuminating an original document to be copied and a digital light control signal generator for supplying a digital light control signal of a variable duty factor to the exposure amount control circuit. The digital light control signal generator includes a light intensity increase/decrease setting circuit and an oscillator for generating an oscillation output of a variable oscillation period in accordance with a light intensity signal from the light intensity increase/decrease setting circuit. The oscillation output of the oscillator is converted to an on-off light signal, which is supplied to the exposure amount control circuit as the digital light control signal.

Abstract: A still camera includes a housing having a film chamber that is open to one side of the camera housing and is designed for drop-in loading of the film cartridge and leader. A channel leads from this side of the camera to the film path and a cavity is located at one end of the film path for receiving the film cartridge while a cavity is located at the other end of the film path which houses a take-up spool. The take-up spool has a slot for receiving the film leader and the camera incorporates drive mechanism for automatically aligning the slot of the take-up spool with the channel when the chamber door is opened. The drive mechanism forms part of the film transport system.

Abstract: In a caseless camera, a cover plate having a contact member at the rear side thereof is slidably mounted at the front side of a camera body between its closing and opening positions. An electric flash mounted inside the camera body traversely movably between its restoring and operating positions is provided with an inclined step at the front side thereof. The contact member of the cover plate contacts and downwardly push the inclined step of the electric flash so as to return the electric flash to its restoring position, when the electric flash is in its operating position, upon the sliding movement of the cover plate from its opening positions to its closing position.

Abstract: A device for fixing a camera to a tripod which comprises a base and a slider to which a camera is to be fitted. Both base and slider are prepared from synthetic resin. The slider is slidably fitted on the base. One of the slider and base is provided with a projection, and the other thereof is provided with an integral elastically deformable piece. This deformable piece involves a protrusion engageable with the above-mentioned projection when the slider is set on the base, and a free end which allows for the elastic deformation to remove the slide from the base.

Abstract: A photographic camera comprising a principal lens assembly and a converter lens assembly for providing a focal length different from that of the principal lens assembly when used. The converter lens assembly is carried by an intermediate barrel for the support of the principal lens assembly through a lens mount such that the converter assembly can move together with the principal lens assembly. A switching mechanism is also used for selectively bringing the converter lens assembly into and out of alignment with the optical axis of the principal lens assembly.

Abstract: A still camera includes a housing having a film chamber for receiving a film cartridge having a film leader with the chamber defining a film path communicating with an edge of the housing through a channel. The film chamber also has a cavity at one end of the film path for drop-in loading of the cartridge in the direction of the plane of the film and a cavity at the opposite end housing a take-up spool. An imaging area is located at one side of the film path and a pressure plate is generally aligned with the imaging area on opposite side of the film path and biased towards the imaging area. A mechanism is provided for moving the pressure plate away from the imaging area to accommodate film loading and unloading, as well as film rewind.

Abstract: A focusing-screen holder (13) provided with a focusing screen (14) is connected to a camera back (11) by means of springs (15). At least one cam plate (17) is located on the focusing-screen holder (13). This cam plate (17) can be swung between two end positions by means of an actuating handle (26) and cooperates with a slide face (22) of the camera back (11). In its first end position, cam plate (17) enables the focusing screen holder (13) to enter into abutting relation with the camera back (11) through the force of the springs (15). By swivelling the cam plate (17) to its second end position, the focusing-screen holder (13) is lifted off the camera back (11) against the force of the springs (15). The cam plate (17) has a radial cam (52) which is in abutting relation with an actuating pin (50). The latter is under the effect of a retarding mechanism (36) so that swivelling motions of the cam plate (17) from the second to the first end position are damped, dependent upon the actual velocity.

Abstract: A silencer of the resonance absorption type in a motor-compressor for refrigerators in which the resonance chamber is formed by a blind cylindrical bore in the cylinder block and communicates with the refrigerant gas duct through an opening in the valve plate.