Abstract: A digital sound signal reproducing device 10 includes a reduced number of guide rolls and so forth by changing the mounting position of a sound drum 13. The digital sound signal reproducing device 10 is made up of a guide sprocket 11, a guide roll 14 and a sound drum 13, about which runs an image film 1. The sound drum 13 carries a optical readout device 20 for reading out and reproducing digital sound signals recorded on a digital sound signal recording portion 5 of the image film 1. The guide sprocket 11 is arranged in the vicinity of an image film supply port 10A supplied with the image film 1. The guide roll 14 is arranged in the vicinity of an image film output port 10B from which the image film 1 is led out. The guide sprocket 11 includes an image film running adjustment device 30 adapted for applying a running load on the image film 1 supplied to the optical readout device 20.

Abstract: A digital sound signal reading means 20 is provided in association with a sound drum 13 on which an image film 1 delivered from a cinema film supply unit 50 circumferentially travels to carry out reading and reproduction of digital sound signals recorded in a digital sound signal recording portion 5 of the image film 1. An image film traveling adjustment unit 30 is disposed at least at the position of the preceding stage of the image film traveling path. The image film traveling adjustment unit 30 applies traveling load in dependency upon traveling state of the image film 1 to allow the image film 1 to travel up to the digital sound signal reading means 2 in a stable state thus to allow it to carry out reading and reproduction of digital sound signals.

Abstract: An infra-red radiation detector element and its manufacture. The detector element has a mesa (31) of infra-red sensitive material, e.g. cadmium mercury telluride, with separate metal electrodes (64 and 55, see FIG. 17) formed on side-walls of the mesa (31) from a metal layer 33. This permits a significant proportion of the current flow occurring between the electrodes (64 and 55) in operation of the element to pass across the bulk of the mesa (31) between its side-walls and not adjacent its top surface where the carrier recombination velocity may be higher. The mesa (31) is formed by ion-etching using a masking layer (24) e.g. of photoresist, and this permits reproducible etching over a uniform depth and the obtaining of a topographically rough surface to which the subsequently-deposited metal layer (33) can have good adhesion. The electrodes are formed from this layer (33) by a lift-off technique using the same masking layer (24).

Abstract: In a sound motion picture camera of the type adapted for selective use of a sound magazine and a silent magazine and having separate drives for intermittent advancement and constant-speed transport of the film respectively on an exposure station and a sound recording station, the speed of rotation of a motor for the intermittent film drive is adjusted in accordance with the preselected value of picture frame speed when the used magazine is of the silent type, and varied as taking either of two discrete values faster and slower than the normal picture frame speed, depending upon whether a slack loop of the film formed between the exposure station and the sound recording station is decreased or increased from the predetermined length thereof, when the used magazine is of the sound type.

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: A movie camera capable of magnetic recording on a loaded film simultaneously with filming includes a pinch roller carried by a bracket which is swingable relatively to the camera body. The pinch roller is movable relatively to the bracket. The bracket is movable in response to the closing operation of a lateral cover of the camera to a position where the pinch roller is adjacent to a capstan and restrained immovably in the position. In response to the operation of a release element for initiating recording, the pinch roller is moved by a spring member into rolling engagement with the film to urge the same into contact with the capstan for recording on the film along a recording track.

Abstract: The present invention relates to a motion picture camera which includes an openable cover for loading a film magazine containing a film capable of recording sound information. A sound recording device for recording the sound information on the film and a movable device for moving either the sound recording device or the film to a position at which the sound can be recorded is also included. An operation device for operating the opening and the closing of the openable cover can be displaced to three positions, i.e. the first, the second and the third position. The operation is carried out stepwise so that, at the first position, the movable device operates while the openable cover is locked; at the second position, the movable device does not operate while the openable cover is locked; and at the third position, the movable device does not operate while the openable cover is freed. At least one of the three position being non-linear with respect to the other two.

Abstract: The present invention relates to a camera capable of simultaneous film and sound recording and into which film magazine housing a film with a sound recording belt can be loaded. The camera has a sound recording device for recording sound on said sound recording belt of the film while photographing is made and also a driving device to continuously run the above mentioned film against said sound recording device. The camera can be shifted to the simultaneous sound recording state in response to the shutter release operation of the camera being in the preparation completion state for photographing with simultaneous sound recording.

Abstract: Disclosed is a film speed control device for a single-system sound camera capable of simultaneous picture/sound recording in which an intermittent film transport mechanism at the exposure station and a constant speed film transport mechanism at a sound station having a magnetic recording head are driven synchronously by separate drive motors. In the control device, the impedance of a high frequency coil is changed in response to changes in the size of a film loop between the stations to control the rate of operation of the intermittent film transport so as to maintain constant the size of the film loop. The output of the high frequency oscillator is used for AC bias for the magnetic recording head, and is rectified for use as a power source for the recording amplifier.