Abstract: A lens drive device capable of operating either of a first interchangeable lens barrel having a photographic lens movable relative to the barrel in a prescribed range with switches arranged at the terminal ends of the range so that when movement of the photographic lens reaches the terminal end, a motor driving the focusing lens member is stopped, and a second interchangeable lens barrel having no switches for stopping the focusing lens drive motor, wherein when the first barrel is in use, the lens drive signal is stopped based on the aforesaid switch, and when the second barrel is in use, the aforesaid signal is stopped in a prescribed time measured from the start of rotation of the motor.

Abstract: A focus detecting device for determining a focused state of a photo taking optical system through a video signal obtained from an image sensor comprises a detecting circuit arranged to detect focused degrees obtained by scanning at a plurality of scanning line parts of an image sensing plane; a correlation determining circuit arranged to determine a correlation between positions on scanning lines at which the focused degrees are detected during the processes of the scanning lines; and a computing circuit arranged to determine a focused state by computing the focused degrees detected from the scanning line parts which are determined to be correlated to each other by the correlation determining circuit.

Abstract: A distance measuring apparatus which emits light toward an object, receiving light reflected by the object, and measuring the distance of the object. This apparatus includes receiving means for receiving the reflected light, and the receiving means has at least two receiving areas. According to a disclosed technique, a mean value of photoelectric outputs from the respective receiving areas is calculated, and the distance of the object is measured on the basis of the difference between the mean value and the photoelectric output from either of the receiving areas. According to another disclosed technique, stabilization is provided with respect to amplifier means for amplifying the photoelectric outputs from the receiving means and integrating means.

Abstract: The invention relates to an active type AF apparatus. In an AF type apparatus for radiating light from a projecting means to an object, receiving light reflected by the object by first and second photosensor portions, and obtaining distance data based on outputs form the photosensor portions, the signals from the first and second photosensor portions are time-divisionally integrated in the same direction by a single integrating circuit and distance data is obtained based on data on integrated values.

Abstract: In a focus adjusting device having a light projecting source for projecting distance measuring light onto an object, a light sensing element divided into a plurality of light sensing areas for sensing the light reflected by the object, and a control member for controlling a lens to be at an in-focus position based on a signal from the light sensing element, a boundary line between the divided light sensing areas of the light sensing element is formed with a number of straight lines or curves, so that the boundary is comb-tooth formed or saw-tooth formed in such a manner that a part of one divided area is positioned in the other divided area.

Abstract: In the disclosed distance measuring device a focal point of an optical system is detected by measuring a distance to an object to be measured with light projecting and receiving means according to the principle of the trigonometric distance measuring method. The device is of the type having light projecting means, light receiving means and the optical axis of the optical system arranged on different planes. Projection of a light flux by the light projecting means is effected within a first plane which contains the optical axis of the optical system and the light projecting means and the reflection of the light from the light flux in projecting means is received within a second plane which contains the optical axis of the optical system and the light receiving means, so that the distance to the object can be always accurately measured on the optical axis of the optical system without any parallax.

Abstract: A range finding system suited for a video camera comprising range detection means for projecting a radiation beam toward an object and receiving a reflected beam coming from the object to detect the object distance, means for generating, on the basis of an image signal of the object, a compensation signal depending upon the radiation reflecting condition of that portion of the object which is irradiated by the radiation beam, and means responsive to this compensation signal for giving compensation to a detection signal of the range detection means.

Abstract: Disclosed is an automatic focus control system including an active type automatic focusing device. The system further includes detecting apparatus which produces a characteristic signal when detecting that an image forming optical apparatus is in an out-of-focus condition, and control means which renders the automatic focusing device in an inoperative condition when the optical apparatus reaches an in-focus condition. It also renders the focusing device in an operative condition in response to the characteristic signal produced by the detecting apparatus.

Abstract: The disclosed automatic focus adjusting device is of the active type whose focusing apparatus becomes operative either when an image of an object goes out of focus, or when the object image has started to move. In one embodiment, a first detecting circuit receptive of index signals reflected from the object detects when the object becomes out of focus based on the high frequency component of the index signal. A second detecting circuit also receptive of index signals reflected from the object detects when the object has moved. An automatic focus control circuit reinstitutes the focusing operation in response to either or both of the detecting circuits. Accordingly, an in-focus object is kept in-focus despite changes in object brightness or movement.

Abstract: The disclosed automatic focus adjusting device has a first distance measuring circuit of the active type and a second distance measuring circuit of the passive type. Based on output signals from the distance measuring circuits, a focusing lens is driven by either the first or second distance measuring circuits. When switching between distance measuring circuits to obtain a change in output signals from the distance measuring circuits, the system makes the selected measuring circuit continue operating until the output signal exceeds a prescribed range of values.

Abstract: A spring clutch which has two wrapped springs wound in different directions from each other and which is arranged to transmit the rotation of a drive source to two members to be driven by effecting change-over from one member to another. The transmission of the rotation is arranged to be immediately cut off at any desired point by operating a change-over member.

Abstract: A motion picture camera provided with an automatic focusing device is arranged to have an image of light emitted from an infrared ray emitting diode projected toward an object to be photographed, and to detect an in-focus state by detecting a peak value of output voltage from a light sensitive element as the direction of the emitted light is varied by a rotatable distance measuring cam. The automatic focusing device is adapted for a zoom lens assembly and is arranged to drive an imaging lens, supported by a shaft which is guided by plate shaped masks at both ends of the lens assembly, in the direction of the lens optical axis. The force for driving the imaging lens is kept low, so that the imaging lens can be accurately adjusted by a rotatable focusing cam during a focusing operation. The rotational position of the distance measuring cam, and that of the focusing cam, are provided in the form of resistance values which vary according to the cam lifts, or in the form of digital codes.

Abstract: A camera having a distance measuring optical system and a photograph taking optical system is provided with an optical member carrying body formed by unifying a carrying member carrying at least a part of the photograph taking optical system and a carrying member carrying the distance measuring optical system. The optical member carrying body is molded with a synthetic resin and an internal reinforcement member such as a metal plate.

Abstract: In the disclosed motion picture shutter angle control device, a motor serves exclusively for varying the shutter opening angle formed with a number of shutter blades. A detector detects when a predetermined shutter opening angle is obtained and delivers a signal which is used in a fade operation and the overlap operation to change the maximum opening angle.

Abstract: The present invention relates to a camera having an automatic focus adjusting device, being characterized in that the motor for the focus adjustment is not provided particularly, whereby the motor for the shutter operation and the film feeding is changed over by means of a clutch so as to be used for the focus adjustment.

Abstract: In the disclosed motion picture system a shutter drive control circuit renders it possible to operate a rotary shutter in various exposure control modes including a mode in which rotation of the shutter is stopped for each long exposure of motion picture frame, the system can defer release of the shutter to the exposure aperture closed position pending completion of a picture frame exposure in any of the modes. The system terminates the preceding manual actuation of a shutter trigger when the taking of the particular picture frame is in progress.

Abstract: In the disclosed automatic exposure control device for a motion picture camera and so on, a diaphragm driving arrangement drives a diaphragm arrangement. An exposure control arrangement having a light sensing element for sensing scene light and producing an electrical output corresponding to the scene brightness, controls the diaphragm driving arrangement on the basis of the output of the light sensing element, the sensitivity information of the film to be used and so on, so that a proper exposure can be obtained. A diaphragm presetting arrangement electrically controls the diaphragm driving arrangement independently of the exposure control arrangement to set the diaphragm arrangement at an intermediate opening position. A selector normally disables the control of the diaphragm driving arrangement by means of the exposure control arrangement and enables the control of the diaphragm driving arrangement by arrangement of the diaphragm presetting means.

Abstract: A motion picture camera provided with a device which ensures satisfactory film exposure by cutting off unnecessary electric power supply to an electrical circuit of an information indicating lamp or the like in response to a camera setting action made to allow the camera to operate even after the operator thereof moves away from the camera.

Abstract: A self-timer for cinecameras wherein an electric delay circuit is used for detecting a length of time from the release to the commencement of a photographing process which takes place with an electric power having been actually supplied to a film feeding motor. The amount of the rotation made by the film feeding motor from the start of the rotation of the motor is either mechanically or electrically detected. When the detected amount of rotation reaches a preset value corresponding to a number of frames of the film required for self-timer photographing, the motor is stopped to terminate the photographing operation, so that the photographing operation with the self-timer can be accomplished exactly for a preset number of frames.

Abstract: The present invention relates to a motion picture camera which includes a color conversion filter for adapting the tungsten type film to the daylight photography, a manual operation means capable of taking the filter out of the photographic optical path and compensating the sensitivity of the exposure meter device in accordance with the removal of the filter so as to adapt the tungsten type film to the tungsten light photography and a detecting means for removing the filter from the photographic optical path by detecting that the film is of the daylight type so that the tungsten type film as well as the daylight film can be used.