Abstract: A rotor used for a motor includes a rotor core, and a plurality of permanent magnets embedded in a corresponding plurality of embedding holes in the rotor core configured to include flux barriers at both ends of the plurality of embedding holes in the rotor core and to include a plurality of magnetic poles. The rotor core includes a plurality of grooves on an outer peripheral surface, the plurality of grooves, with the two paired grooves, are away from an axis that becomes the q-axis when the motor is operated, and are arranged symmetrically about the axis, and the rotor core has such a cross-section that a first angle between two lines passing through the two grooves and the center of the rotor core is smaller than a second angle between the axis-side end face of the two flux barriers adjacent to each other across the axis.

Abstract: A lens driving device includes a movable part, a plate spring that movably supports the movable part, a coil provided on the movable part, and magnets facing the coil. An outer portion of the movable part includes protrusion opposing parts where first restricting protrusion and second restricting protrusions face each other in an optical axis direction and non-opposing parts where the first restricting protrusion and the second restricting protrusions do not face each other in the optical axis direction, the coil is formed by winding a conductor wire around the outer portion in a circumferential direction and includes first coil portions positioned in the protrusion opposing parts and second coil portions positioned in at least some of the non-opposing parts, and the width of the second coil portions in the optical axis direction is greater than the width of the first coil portions in the optical axis direction.

Abstract: A lens driving device includes a movable part, a plate spring that movably supports the movable part, a coil provided on the movable part, and magnets facing the coil. An outer portion of the movable part includes protrusion opposing parts where first restricting protrusion and second restricting protrusions face each other in an optical axis direction and non-opposing parts where the first restricting protrusion and the second restricting protrusions do not face each other in the optical axis direction, the coil is formed by winding a conductor wire around the outer portion in a circumferential direction and includes first coil portions positioned in the protrusion opposing parts and second coil portions positioned in at least some of the non-opposing parts, and the width of the second coil portions in the optical axis direction is greater than the width of the first coil portions in the optical axis direction.

Abstract: An optical fiber connector includes a receptacle casing, a cylinder provided in the receptacle casing, and a wire spring disposed on the inner wall of the cylinder. In the optical fiber connector, a fiber holding part provided at an end of an optical fiber is inserted into the cylinder, the outer periphery of the fiber holding part is elastically pressed by the wire spring in the direction perpendicular to an optical axis of the optical fiber, the outer periphery of the fiber holding part is brought into abutment with the inner wall of the cylinder, and the end of the optical fiber is fitted to the receptacle casing.

Abstract: An optical fiber connector including a receptacle housing and a cylindrical member disposed within the receptacle housing, with fine pores for taking dust therein being formed in an inner wall of the cylindrical member, wherein a ferrule provided at a tip end of an optical fiber is inserted into the cylindrical member, allowing dust which has entered the cylindrical member to be received within the fine pores, an outer periphery of the ferrule is brought into abutment against the inner wall of the cylindrical member, and the tip end of the optical fiber is attached to the receptacle housing.

Abstract: An optical fiber connector includes a receptacle casing, a cylinder provided in the receptacle casing, and a wire spring disposed on the inner wall of the cylinder. In the optical fiber connector, a fiber holding part provided at an end of an optical fiber is inserted into the cylinder, the outer periphery of the fiber holding part is elastically pressed by the wire spring in the direction perpendicular to an optical axis of the optical fiber, the outer periphery of the fiber holding part is brought into abutment with the inner wall of the cylinder, and the end of the optical fiber is fitted to the receptacle casing.

Abstract: The optical fiber connector of the invention comprises a first optical fiber, a first convex lens that converges light emitted from the first optical fiber, a second convex lens that converges light emitted from the first convex lens, and a second optical fiber that receives a convergent light beam from the second convex lens, wherein, when a core diameter of the first optical fiber is given by E1, a numerical aperture thereof by NA1, a core diameter of the second optical fiber by E2, a numerical aperture thereof by NA2, a focal length of the first convex lens by f1, a focal length of the second convex lens by f2, and (E1/E2)/(f1/f2)=x is introduced, a connection efficiency &eegr; of the first and the second optical fibers satisfies the following inequality (E1/E2)2<&eegr;≦(1/x)2·NA2/sin(tan−1 E1/E2·NA1/x), in 1<x<E1/E2·NA1/sin(tan−1 NA2).

Abstract: A module for optical communication which is capable of securely preventing reflection even if there are variations in the urging force of a ferrule and also of protecting an antireflection member from damage. A holding stopper for holding an antireflection member and also for positioning a ferrule is installed coaxially in a housing. A ferrule holding member for holding the ferrule is coaxially mounted on the holding stopper. When the ferrule is urged by a spring or other urging member and inserted in the ferrule holding member, the distal end of the ferrule first comes in contact with the apex of the antireflection member, causing the antireflection member to deform according to the distal end surface of the ferrule, then the distal end of the ferrule comes in contact with the reference surface of the holding stopper so that it is positioned and fixed in the direction of an optical axis.

Abstract: An optical fiber connector designed so as to reduce the number of assembly steps and the number of component parts to reduce the manufacturing cost while maintaining improved characteristics under certain environmental conditions. The optical fiber connector has a sleeve fitted to a ferrule of a plug, a clamper engaged with the plug to hold the same, and a housing in which the clamper is held. The clamper is formed of a synthetic resin and has elastically-deformable leg portions and engaging portions. Engaging projections 16g to be engaged with the engaging portions of the clamper to hold the clamper in the housing are provided in the housing.

Abstract: A module for optical communication, adapted to prevent light from being reflected on the end surface of an optical fiber when a ferrule is inserted therein, and to increase the precision with which the positioning of an end surface of the optical fiber is performed. In the module, the circumference of an anti-reflection transparent film is held in a groove of a stopper member and is pressed against the inner circumference of an elastic sleeve. When the ferrule is inserted in the sleeve, the film adheres to the end surfaces of the optical fiber and the ferrule closely and securely. Thus, no air layer is formed between the film and the end surface of the optical fiber. Laser light is not reflected on the end surface of the optical fiber. The end surface of the ferrule adheres closely to a positioning face of the stopper member, though the film intervenes therebetween.