Abstract: An electromagnetic actuator applied to a camera shutter device includes a rotatable disk-shaped rotor (10) magnetized with different polarities and having an output portion (10b), a first plate-like yoke (40) with a first magnetic pole part (41) opposed to the outer peripheral surface of the rotor (10) and a second plate-like yoke (50) with a second magnetic pole part (51) opposed to the outer peripheral surface of the rotor (10), and a first coil (20) and a second coil (30) wound around the joint areas of the yokes so that the first and second coils become flat in the same direction as the first yoke (40) and the second yoke (50). By virtue of this configuration, the electromagnetic actuator can be thinned. Furthermore, the camera shutter device using this electromagnetic actuator and thus the camera can be thinned and miniaturized.

Abstract: A focal plane shutter for cameras is provided with a shutter blade which can be actuated to both directions for opening and for closing a photographing optical path by an electromagnetic apparatus. When a rotor is rotated to the direction corresponding to the direction of conduction of coils an actuating member which is formed in one with the rotor make arms rotate by its actuating pin and actuates four blades of the shutter blade about upward and downward direction. A brake member rotatably arranged together with on a friction plate on a shaft has bent portions formed near tip portions of the arm portions which are inserted in a slot on a shutter base plate. An operation for opening the shutter blade is braked by the actuating pin contacting, pressing and moving one of the bent portions at termination stage, and a closing operation is braked by the actuating pin contacting, pressing and moving another bent portion at the termination stage.

Abstract: A first blade actuating member and a second blade actuating member have pins, respectively. A movable contact member, which is urged to rotate in a counterclockwise direction, has locking arms and a contact piece member. When the first blade actuating member is rotated in the counterclockwise direction in photographing, the movable contact member causes a locking arm of to follow a pin of the first blade actuating member and causes the contact piece portion to come into contact with the contact piece portion of a stationary contact portion to thereby detect an abnormal actuation of the first blade actuating member by offset from normal timing.

Abstract: A superconductor having at least one Hg—M—Cu—O (M=Ba, Sr and/or Ca) superconducting film provided on a substrate and having a thickness of between 300 Å to 950 Å. The superconductor may be prepared by forming, on a substrate, a precursor laminate composed of a first, M—Cu—O film and a second, Hg—O film. The precursor laminate film-bearing substrate is placed in a closed vacuum chamber together with a first pellet of HgO, MO and CuO and a second pellet of MO and CuO. The contents in the chamber are heated to form, on the substrate, a superconducting Hg—M—Cu—O film. The thickness of the first M—Cu—O film of the precursor is controlled so that the thickness of the superconducting Hg—M—Cu—O film is in the range of between 300 Å to 950 Å.

Abstract: A first blade actuating member and a second blade actuating member have pins, respectively. A movable contact member, which is urged to rotate in a counterclockwise direction, has locking arms and a contact piece member. When the first blade actuating member is rotated in the counterclockwise direction in photographing, the movable contact member causes a locking arm of to follow a pin of the first blade actuating member and causes the contact piece portion to come into contact with the contact piece portion of a stationary contact portion to thereby detect an abnormal actuation of the first blade actuating member by offset from normal timing.

Abstract: A superconductor having at least one Hg-M-Cu—O (M=Ba, Sr and/or Ca) superconducting film provided on a substrate and having a thickness of between 300 Å to 950 Å. The superconductor may be prepared by forming, on a substrate, a precursor laminate composed of a first, M-Cu—O film and a second, Hg—O film. The precursor laminate film-bearing substrate is placed in a closed vacuum chamber together with a first pellet of HgO, MO and CuO and a second pellet of MO and CuO. The contents in the chamber are heated to form, on the substrate, a superconducting Hg-M-Cu—O film. The thickness of the first M-Cu—O film of the precursor is controlled so that the thickness of the superconducting Hg-M-Cu—O film is in the range of between 300 Å to 950 Å.

Abstract: A superconductor having at least one Hg—M—Cu—O (M=Ba, Sr and/or Ca) superconducting film provided on a substrate and having a thickness of between 300 Å to 950 Å. The superconductor may be prepared by forming, on a substrate, a precursor laminate composed of a first, M—Cu—O film and a second, Hg—O film. The precursor laminate film-bearing substrate is placed in a closed vacuum chamber together with a first pellet of HgO, MO and CuO and a second pellet of MO and CuO. The contents in the chamber are heated to form, on the substrate, a superconducting Hg—M—Cu—O film. The thickness of the first M—Cu—O film of the precursor is controlled so that the thickness of the superconducting Hg—M—Cu—O film is in the range of between 300 Å to 950 Å.

Abstract: An electromagnetic actuator applied to a camera shutter device includes a rotatable disk-shaped rotor (10) magnetized with different polarities and having an output portion (10b), a first plate-like yoke (40) with a first magnetic pole part (41) opposed to the outer peripheral surface of the rotor (10) and a second plate-like yoke (50) with a second magnetic pole part (51) opposed to the outer peripheral surface of the rotor (10), and a first coil (20) and a second coil (30) wound around the joint areas of the yokes so that the first and second coils become flat in the same direction as the first yoke (40) and the second yoke (50). By virtue of this configuration, the electromagnetic actuator can be thinned. Furthermore, the camera shutter device using this electromagnetic actuator and thus the camera can be thinned and miniaturized.

Abstract: A light-shielding blade material is provided that contributes to increased focal plane shutter speeds. A focal plane shutter has a front blade group and a rear blade group, each being composed of a plurality of light-shielding blades. At least one of these light-shielding blades is made of a Be—Al alloy material containing 40% by weight or more of Be, and has a thickness of 40 to 150 microns. This light-shielding blade is light in weight and high in stiffness, thereby significantly contributing the increased focal plane shutter speeds.

Abstract: A light-shielding blade material is provided that contributes to increased focal plane shutter speeds. A focal plane shutter has a front blade group and a rear blade group, each being composed of a plurality of light-shielding blades. At least one of these light-shielding blades is made of a Be-Al alloy material containing 40% by weight or more of Be, and has a thickness of 40 to 150 microns. This light-shielding blade is light in weight and high in stiffness, thereby significantly contributing the increased focal plane shutter speeds.

Abstract: A light-shielding blade material is provided that contributes to increased focal plane shutter speeds. A focal plane shutter has a front blade group and a rear blade group, each being composed of a plurality of light-shielding blades. At least one of these light-shielding blades is made of a Be-Al alloy material containing 40% by weight or more of Be, and has a thickness of 40 to 150 microns. This light-shielding blade is light in weight and high in stiffness, thereby significantly contributing the increased focal plane shutter speeds.

Abstract: A light-shielding blade for use in cameras utilizes a film of para-type aromatic polyamide for its base material. The light-shielding blade has a single-layer structure using an aramid film as its blade material. The film is added with carbon black at a ratio of 2 to 10 percent by weight relative to a total weight of the blade material. Alternatively, the light-shielding blade has a laminated structure with a plurality of aramid films stacked each other and having a thickness of 2 to 30 microns each, a total thickness being set to a range of 50 to 200 microns.

Abstract: A focal plane shutter comprising a front blade braking lever functioning to press a front blade actuating lever to a rotating shaft thereof by utilizing resilience of a front blade actuating spring at a final stage of an exposure operation performed by the front blade actuating lever and a rear blade braking lever functioning to press a rear blade actuating lever to a rotating shaft thereof by utilizing resilience of a rear blade actuating spring at a final stage of an exposure operation performed by the rear blade actuating lever. This focal plane shutter is simple in structure thereof, capable of controlling exposure of film with high accuracy and maintaining initial performance thereof for a long term, and can be manufactured at a low cost.

Abstract: The camera shutter device incorporated with lens shifting mechanism comprises a driving motor which is so controlled as to be rotated in the normal direction in the focusing process, and in the reverse and normal directions in the exposure process, a cam ring allowing a lens barrel to be shifted from a standard position to at least one forward-shifted position by the rotation of the driving motor in the normal direction in the focusing process, and a shutter blades opening and closing lever allowing the shutter blades to be opened and closed by the rotations of the driving motor in the reverse and normal directions in the exposure process. The camera shutter device permits simplifying the overall structure thereof and the operating sequence from the focusing operation to the exposure operation, and reducing the force and turning stroke required for shutter setting.

Abstract: A blade type focal plane shutter wherein an exposure aperture is made to be always covered with a front blade group and rear blade group in a mirror-down state by operatively connecting a quick return mirror and a blade opening and closing controlling mechanism with each other in order to obtain a high light shielding property with the front blade group and rear blade group except when an exposure is made.

Abstract: The resistance welding machine of this invention has an arm carrying a movable electrode and provided with a supporting bore, a power receiving bushing fitted in the supporting bore, and a power feeding shaft mounted on the main body of the welding machine on which a second electrode, is also mounted. The power feeding shaft is received by the bore of the power receiving bush to support the arm while supplying electric power to the movable electrode. A plurality of grooves are formed in the inner peripheral surface of the power receiving bushing to receive powders generated as a result of local wear due to sliding contact between the power feeding shaft and the power receiving bushing. The grooves are filled with grease which adsorbs and holds the powders.

Abstract: A light leakage preventing device for reflex cameras wherein a flexible light intercepting member is provided between the upper edge of a reflecting mirror and the vertical wall of a mirror box and a light intercepting member which can be brought to a light intercepting position in association with the movement of the reflecting mirror is provided between the lower edge of the reflecting mirror and the bottom wall of the mirror box so that, when the reflecting mirror is in a position in which it can conduct a light from an object to be photographed to a view finder, the light leakage from the upper edge and lower edge of the reflecting mirror to a film can be positively prevented.

Abstract: A bound preventing device for focal plane shutters which is provided with a rear blade operating arm which can move a rear blade between an exposure aperture covering position and opening position and a brake lever which is set in the motion track of the rear blade operating arm and can collide with a rear blade operating lever in order to control the rear blade operating arm in the final stage of the motion of the rear blade operating arm so as to prevent bounds when the motion of the rear blade ends. This brake lever can also catch the rear blade operating arm when it collides with the rear blade operating arm.

Abstract: A blade type focal plane shutter comprising a plurality of auxiliary shutter blades which are pivoted on the side of an exposure aperture and can move between the unfolded position and folded position, a main shutter blade for forming an exposure slit which is rotatably supported on two of the auxiliary shutter blades and an actuating member which is pin-slot connected to the auxiliary shutter blades to move the auxiliary shutter blades and main shutter blade between the unfolded position and folded position so that the entire shutter can be made small and can be manufactured at a low cost.

Abstract: A blade type focal plane shutter wherein an auxiliary arm is always biased with a spring so that backlashes at pivotably connecting points between a driving arm and shutter blades and between the auxiliary arm and shutter blades may not have a bad influence on the shutter opening and closing motions. This focal plane shutter is provided with a braking lever which can catch a closing driving lever to prevent a bound from being caused when the motion of the shutter blades for exposure ends.