Abstract:
A motor provided with a rotor magnet circumferentially divided into n section which are alternately magnetized to different poles, a coil disposed axially of the rotor magnet, outer magnetic poles and inner magnetic poles excited by the coil being opposed to the outer peripheral surface and inner peripheral surface, respectively, of the rotor, and a holder for holding the rotor magnet at a position at which the centers of the poles of the magnet deviate from a line linking the centers of the outer magnetic poles and the center of rotation of the magnet together when the outer magnetic poles and the inner magnetic poles are not excited, whereby the motor is made into a one-phase motor to thereby stabilize the initial positioning of the rotor and also, the motor is made high in output and super-compact.
Abstract:
An electrical motor includes a cylindrical magnet divided into n regions circularly around at least an outer circumference thereof that are magnetized in alternate polarities. The motor also includes first and second coils arranged in an axial direction of the magnet. The magnet is interposed between the first and second coils. The motor further includes first and second external portions excitable by current flowing through the first and second coils, respectively, so that these portions become first and second external magnetic poles, respectively. The first and second external portions face the outer circumference of the magnet at one side and the other side thereof, respectively. The area of the first and second external portions facing the outer circumference of the first and second coils, respectively, is equal to or smaller than three-quarters of the area of the outer circumference of the first and second coils, respectively. The motor also includes first and second internal portions excitable by current flowing through the first and second coils, respectively, to cause these portions to become first and second internal magnetic poles, respectively. The first and second internal portions face the internal circumference of the magnet on the one and the other sides of the magnet, respectively.
Abstract:
A shutter device includes first and second light blocking members arranged to be movable to vary the amounts of opening. First and second motors are arranged to drive respectively the first and second light blocking members, and a control circuit is arranged to individually control the driving actions of the first and second motors.
Abstract:
A camera provided with a magnetic head for effecting at least one of writing information into a magnetic portion of a film and reading information from the magnetic portion. The camera includes a detection circuit for detecting a feed speed of the film and a prohibiting circuit for prohibiting a photographing operation of the camera when the feed speed of the film detected by the detection circuit is lower than a predetermined speed.
Abstract:
This invention relates to a camera for reading out and/or reading information from a magnetic recording portion provided to a film using a magnetic head.This invention provides a camera, wherein the film feed speed until the film passes the head position is set to be lower than a predetermined speed, so that the film can be prevented from colliding against the head portion with a shock.
Abstract:
A stepper motor includes a cylindrical rotor, a plurality of stators, a plurality of yokes, and a plurality of coils. The cylindrical rotor is made of a permanent magnet which has been magnetized radially. The rotor has two magnetized layers formed in an axial direction thereof. Each of the stators has a plurality of magnetic pole portions which are disposed such that they oppose an outer periphery of the rotor. The magnetic pole portions of the stators oppose one of the magnetized layers of the rotor. The plurality of yokes are made of a permeable material. The yokes are separated from the stators in the axial direction of the rotor. The end portions of the yokes oppose the other magnetized layer of the rotor. The plurality of yokes are shifted from the stators by a predetermined angle. The plurality of coils are disposed such that each coil excites a corresponding stator. By this arrangement, the diameter of the lens barrel of a camera containing such a stepping motor can be reduced and the output and efficiency of the stepper motor can be improved.
Abstract:
An image pickup apparatus in which an image of an object is converted by an image sensor into video signals to be supplied to a monitor is disclosed wherein a control circuit controls the substantial exposure of the image sensor and the monitor is inhibited from displaying the video signals when the exposure is not adequately controlled by the control circuit.
Abstract:
A camera of the kind using a film which has a magnetic storage part comprises a magnetic head which is arranged to read and write information out of and into the magnetic storage part of the film; and a follow-up part which is arranged to follow up a yawing movement of the film resulting from the travel of the film without allowing the magnetic head to follow the movement of the film in its traveling direction.
Abstract:
A camera using a film with a magnetic memory has a magnetic head for writing information to or reading information from the magnetic memory of the film, a pressure plate for holding the magnetic head, and a notch generally formed in the pressure plate at an area where the pressure plate holds the magnetic head.