Abstract: A multiple light emission control system delivers an emission initiate signal and an emission interrupt signal to each of a plurality of electronic flashes from a camera, in accordance with an adjustable circuit for establishing a relative proportion of flashlight emission from the plurality of electronic flashes.

Abstract: A method of automatically adjusting focus conditions of photographic optical system is disclosed. In the method at least a part of optical image formed on a predetermined focal plane by an optical system is projected onto first and second photocell arrays in the front and the rear of a surface conjugated to the predetermined focal plane, and onto at least one of other photocell arrays arranged between the first and second photocell arrays. Outputs of first, second and other photocell arrays are arithmetically operated in accordance with respective given evaluation functions thereby obtaining first, second and other evaluation values. These evaluation values are compared with each other and the optical system is intermittently shifted in the optical axis direction with first or second moving step in the case of decision from the compared result that the optical system is positioned within or outside a predetermined range including the in-focused position.

Abstract: An automatic exposure controller for camera permits a free selection between a spotwise photometry, an auto-mode and a manual photographing mode. When switching from the spotwise photometry mode to another photographing mode, photometric information which is stored during the spotwise photometry mode is cleared.

Abstract: An apparatus and method for recording optically an information signal on a disk-like record medium as a spiral track or concentrical tracks by modulating a main beam by the information signal to be recorded and projecting the modulated main beam onto the record medium. In order to obtain a tracking error signal, a sub beam is also projected on the record medium at an edge of an adjacent track which has been previously recorded and the sub beam reflected by the record medium is detected by a light detector to produce the tracking error signal which is then supplied to a high pass filter to remove a low frequency component from the tracking error signal.

Abstract: A focus detecting camera comprises a switching circuit for an automatic release which is operated in response to an in-focus detection signal, a shutter release button mechanism which is capable of maintaining a partially depressed condition of a shutter release button and an automatic release switch which is brought into operation prior to a shutter release operation, in cooperation with said shutter release button mechanism. Under the condition in which the automatic release switch is in operation with the release button partially depressed, the shutter release is performed by activation of the automatic release switching circuit in response to an in-focus detection signal which is detected when a moving object being photographed reaches a preset distance position.

Abstract: An exposure control circuit for camera comprises an integrating circuit including a plurality of capacitors for integrating a photocurrent which depends on the brightness of an object being photographed. The integrated voltage is compared against a decision voltage which depends on a particular value of film speed. The level of the decision voltage is switched either manually or automatically for low and high values of film speed as the combined capacitance of the integrating capacitors is switched.

Abstract: A control circuit for a power supply associated with an electronic flash unit prevents a wasteful power dissipation of a power supply cell which is internally housed within an electronic flash unit, by automatically interrupting the operation of a voltage booster contained within the electronic flash unit in response to an output from a timer circuit which is internally housed within photographic camera whenever the camera is not operated over a given time interval.

Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively. The photosensitive member may be subjected to steps of imagewise irradiation simultaneously with charging, then inverse charging, then uniform exposure and the like to form a positive or a negative electrostatic latent image. The electrostatic latent image thus formed is repeatedly subjected to a developing and a transfer step to produce a number of copies.

Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively.

Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively.

Abstract: A tape cassette loading device for a cassette tape recorder comprises a brushless motor capable of immediately starting to rotate in response to an external starting drive in a direction determined by such drive and also capable of immediately stopping in response to an external braking effort. A movement of a cassette holder is transmitted through a holder drive mechanism to the motor, thereby controlling the motor.

Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively.

Abstract: An apparatus for communicating information relating to taking lens comprises a magneto-electric transducer element disposed on a camera body adjacent to a lens mount thereof, and a magnet disposed on the rear end of a lens barrel which receives an interchangeable lens. The magnet produces a magnetic effect upon the transducer element of a magnitude which depends on the value of functional information of each interchangeable lens.

Abstract: An apparatus for testing an automatic electronic flash is used with the combination of a single lens reflex camera of TTL direct photometry type and a TTL automatic electronic flash. The apparatus includes a test switch which is connected in parallel with a synchro contact contained in the camera for initiating the emission of flashlight and which is closed to test the emission of flashlight from a flash discharge tube. In this manner, by closing the test switch, the emission of flashlight from the electronic flash can be tested and the amount of illumination controlled by an exposure control circuit contained in the camera, without operating a shutter.

Abstract: A lens shutter camera includes a distance adjusting mechanism which is operated by the rotation of a single ring in one direction as it is driven by a drive source such as a motor. A distance adjustment is performed by a movement of a movable taking lens barrel in the direction of an optical axis thereof. Rotation of the ring in the other direction operates a lens shutter mechanism to open the shutter blades. A shutter closing spring is charged by a shutter controlling electromagnet, and is enabled to close the shutter blades.

Abstract: An overexposure indicator for an automatic electronic flash produces a time factor signal of a given duration after an emission terminate signal is delivered to an electronic flash. When the amount of flashlight emitted by the electronic flash reaches an arbitrary multiple of a proper value of exposure, a detection output is produced. The indicator indicates the occurrence of an overexposure whenever detection output is produced during the time the time factor signal is present.

Abstract: An acoustic reproducing apparatus is provided which includes first and second channels and first and second speakers, all disposed in a housing with a sound path for acoustically coupling the first and second speakers. The sound path has disposed therein sound absorbing material which forms a low pass filter which operates to add the low frequency signal component of the first channel to the second channel and also operates to add the low frequency signal component of the second channel to the first channel to produce a composite low frequency signal with greater amplitude which is reproduced in phase by each of the first and second speakers.

Abstract: A photographing mode switching device for a camera includes a position detecting member associated with a mode switching member and a mounting detecting member which detects the mounting of an electronic flash on the camera. A flash photographing mode is established only when the both detecting members indicate that the mode switching member has been displaced to a position where a flash photography is enabled and that the electronic flash has been mounted on the camera.

Abstract: A fundus camera includes an objective lens which is movable in a plane perpendicular to the principal optical axis thereof. The camera also includes an optical system comprising four reflecting surfaces which move as the objective lens is moved to compensate for an optical path length, the arrangement being such that a visual axis of an eye being examined can be brought into alignment with the principal optical axis of the objective lens without changing the length of the observation and photographing light path, by means of a movement of only part of the optical system and without moving the entire main body.

Abstract: An ultrasonic microscope is formed with an impedance matching layer composed of a chalcogenide glass film on a spherical lens portion of an ultrasonic condensing lens which contacts with an acoustic field medium.