Abstract: An end face polishing apparatus has a lapping board mounted to undergo rotation and revolving movement, a lapping member having a polishing surface and disposed on the lapping board for rotation and revolving movement therewith, a polishing fixture for supporting a workpiece having an end face, and a pressing member. During a polishing operation, preselected portion thereof to bring the end face of the workpiece into pressure contact with the polishing surface of the lapping member and to dispose the preselected portion at a position closer to the polishing surface than to a center of gravity of the polishing fixture to thereby polish the end face of the workpiece during rotation and revolving movement of the lapping board.

Abstract: An end face polishing machine has a jig plate for supporting at least one workpiece. A polishing plate is mounted to undergo rotation and revolving movement. A polishing sheet is disposed over the polishing plate for rotation and revolving movement therewith. An elastic member having a hardness that varies with temperature is disposed between the polishing sheet and the polishing plate. A pressing unit presses the end face of the workpiece against a surface of the polishing sheet during rotation and revolving movement of the polishing plate to thereby polish the end face of the workpiece during a polishing operation. A temperature control unit controls the temperature of the elastic member during the polishing operation to thereby polish the end face of the workpiece into a spherical surface during the polishing operation.

Abstract: An end face polishing apparatus with improved polishing precision regardless of the length of ferrules when end faces of the ferrules are polished is provided. In an end face polishing apparatus polishing a rod-shaped member mounted at a polishing fixture by pressing the rod-shaped member against a lapping member on a lapping machine provided on a surface plate that is supported at the main body of the apparatus to rotate and rock, there are a plurality of rod-shaped guide members provided at the polishing fixture radially outwardly projecting and a tubular member capable of supporting the polishing fixture through the guide members on the surface plate. In this way, the guide member sat the polishing fixture and the tubular member abut against each other so that the movement of the polishing fixture in the pressing direction is restricted.

Abstract: An end face polishing apparatus with improved polishing precision regardless of the length of ferrules when end faces of the ferrules are polished is provided. In an end face polishing apparatus polishing a rod-shaped member mounted at a polishing fixture by pressing the rod-shaped member against a lapping member on a lapping machine provided on a surface plate that is supported at the main body of the apparatus to rotate and rock, there are a plurality of rod-shaped guide members provided at the polishing fixture radially outwardly projecting and a tubular member capable of supporting the polishing fixture through the guide members on the surface plate. In this way, the guide members at the polishing fixture and the tubular member abut against each other so that the movement of the polishing fixture in the pressing direction is restricted.

Abstract: An end surface polishing device and an end surface polishing method capable of controlling the polishing amount of the rod-shaped members and shortening the polishing processing time are disclosed. The end surface polishing device for polishing a rod-shaped member attached to a holder in a pushing way, with a polishing member attached to a polishing plate provided on a main body and supported in a rotational and slidable way, is provided with distance detecting means for detecting the relative position of the holder and the polishing plate and measuring means for measuring the actual polishing length of the rod-shaped member supported by the holder, from the position detected by the distance detecting means.

Abstract: A memory control circuit for controlling a memory bus and a memory includes buffers, counters, data transfer circuits, and a bus arbiter having a state machine. Each of the data transfer circuits transmits a request signal demanding start of the data transfer on the basis of at least one of the count values of the counters. If the data transfer circuit associated with the current state transmits the request signal, the bus arbiter transmits an acknowledge signal granting start of the data transfer. Each of the data transfer circuits starts the data transfer at receipt of the acknowledge signal, and stops the data transfer being executed on the basis of either number of pieces of data transferred after the receipt of the acknowledge signal or the count value of at least one of the counters.

Abstract: A jig plate is opposed to a polishing plate, for polishing the face of a ferrule cylindrical member in contact with the polishing plate at a predetermined angle into a convex curve inclined relative to a plane perpendicular to the axis. The jig plate includes a holding part for detachably holding an optical connector plug to a jig plate body having a mounting part to an end face polishing machine. The holding part holds the optical connector plug while correcting the target direction of the inclination of the polished convex curve of the ferrule cylindrical member held by the optical connector plug to turn in the direction opposite to the rotating direction of the polishing plate with respect to a plane including the center of the jig plate body and the axis of an optical fiber. Thus the direction of inclination coincides with the reference direction of the optical connector plug.

Abstract: A circuit for detecting a valid range of a video signal, has a detection window signal generator for generating a detection region window signal which has a low level during at range of time containing a point of time when the vertical sync signal changes its level or another point of time when the horizontal sync signal changes its level, and a valid range detector for detecting the valid range, during which the video signal has a level equal to or greater than a threshold and the detection region window signal has a high level.

Abstract: An optical fiber end face polishing apparatus has an inspection unit for introducing light into the optical fiber and detecting light from an end of the optical fiber, a moving unit for relatively moving the polishing member and the optical fiber in three directions and in a rotating direction, and a coordinate acquiring unit for acquiring a position of the polishing member while detecting the return light. A boundary between the core and clad of the optical fiber is detected with the inspection unit in at least three directions from the outer circumference of end face in its radial direction while polishing toward its axial center. The position of the center of the core is acquired as a coordinate value, and polishing is performed using the center position of the core as a reference.

Abstract: An end face polishing machine having a polishing board supported on a machine body, and an optical fiber retaining jig, and adapted to polish a free end portion of an optical fiber retained by the jig, to the shape of a wedge by a polishing member fixed to the polishing board, the machine including an inspection unit adapted to take a picture image of a free end portion of the optical fiber retained by the jig, and ascertain the position of a core on an end face of the optical fiber.

Abstract: An end face polishing apparatus has a support member mounted for undergoing rotational movement. A tubular member is mounted on the support member for rotation therewith. The tubular member has a first surface connected to a main surface of the support member and a second surface extending in an axial direction at a first distance from the main surface of the support member. A lapping member is mounted on the support member for rotation therewith. The lapping member has a first surface connected to the main surface of the support member and a second surface extending in the axial direction at a second distance from the main surface of the support member smaller than the first distance.

Abstract: A sync signal generator circuit including a first counter which is reset each time it detects a reference edge of the input sync signal, a first register for holding a first value immediately before the first counter is reset, a reset signal generator for generating reset pulses, a second counter which is reset each time it receives a reset pulse, a second register for holding a second value immediately before the second counter is reset, and a sync pulse generator for generating an output sync signal on the basis of the reset pulses. The reset pulse is generated each time the counted value of the second counter matches a predetermined value or each time the first counter detects the reference edge while an absolute value of a difference between the counted value of the second counter and the second value held in the second register is not greater than a permissible value of period fluctuations.

Abstract: The invention is an endface polishing method and an endface polishing apparatus improving polishing accuracy of an optical fiber and making polishing time and polishing work shorten. Polishing is performed making a boundary line center axis while observing the boundary line of brightness and darkness formed at outer circumference face of an optical fiber by irradiating substantial parallel light from the predetermined direction crossing at the right angle to the axis of the optical fiber in an endface polishing method polishing a tip end of the optical fiber held by a jig by a polishing member attached at a polishing disk in an apparatus providing the polishing disk supported by a main body of the apparatus and the jig holding the optical fiber.

Abstract: To provide an optical connector promoting reliability by reducing insertion loss of an optical fiber and downsized, there is provided an optical connector plug having a ferrule including a cylindrical member for the ferrule for holding an optical fiber and a flange member provided at a rear end portion of the cylindrical member for the ferrule, an urge spring provided on a side of a rear end portion of the flange member of the ferrule, and a plug housing for holding the ferrule and the urge spring directly at inside thereof and directly engaged with an optical connector adapter inserted with a front end portion of the ferrule to carry out optical connection, in which the plug housing is formed with a slit capable of inserting the optical fiber in a radius direction thereof at a portion of an outer periphery thereof over an axial direction.

Abstract: An optical functioning component in which strength is maintained while miniaturization is achieved and a number of parts can be decreased to reduce a cost is provided. In an optical functioning component including an attenuation ferrule provided on its front end side and having an attenuation mechanism, an optical connection sleeve for holding a rear end of the ferrule, a frame for holding the ferrule and the optical connection sleeve and a housing for holding the frame so that the frame can move axially and freely by a predetermined amount, a front end side of the housing has a roughly equal shape to a front end of a plug housing of an optical connector-plug connectable to an optical connector-adaptor engaged with the former front end side, and a rear end of the housing has a shape that the optical connector-plug with the plug housing removed can engage.

Abstract: There is provided an end face polishing apparatus and a method of polishing an end face that allow an optical fiber to be processed with improved accuracy. There is provided an inspection unit for introducing inspection light into the optical fiber and detecting return light from an end face of the optical fiber or light transmitted by the optical fiber coming from the end face, a moving unit for positioning and moving relative positions of the polishing member and the optical fiber in the direction of a Z-axis that is the axial direction of the optical fiber, in the directions of X- and Y-axes orthogonal to the direction of the Z-axis, and in a rotating direction about the Z-axis, and a coordinate acquiring unit for acquiring a moving position of the polishing member as a coordinate by substantially moving the polishing member with the moving unit while detecting the return light or transmitted light from the optical fiber with the inspection unit.

Abstract: Provided is a PC connector to be removed of useless stress during attached/detached thus being stably attached/detached. A flange part is provided in a polygonal or disk form circumferentially projecting on the flange member at a tip side thereof. In a holding part holding the flange member, an engaging part is formed axially of the optical fiber and in a predetermined engaging width. The flange part has a predetermined clearance to the engaging part at an axial tip side thereof. A rotation positioning part restricts a movement in rotational direction of the flange part. A rotation allowing part is provided to form, on a rear-end side of the rotation positioning part, a clearance greater than the clearance of between the rotation positioning part and the engaging part.

Abstract: An end surface polishing device and an end surface polishing method capable of controlling the polishing amount of the rod-shaped members and shortening the polishing processing time are disclosed. The end surface polishing device for polishing a rod-shaped member attached to a holder in a pushing way, with a polishing member attached to a polishing plate provided on a main body and supported in a rotational and slidable way, is provided with distance detecting means for detecting the relative position of the holder and the polishing plate and measuring means for measuring the actual polishing length of the rod-shaped member supported by the holder, from the position detected by the distance detecting means.

Abstract: The invention provides an end face polishing device high in polishing speed. The end face polishing device has a pressing unit pressing an end face of a fixed bar member to a polishing sheet and a driving unit driving the polishing sheet in roulette shape moving while rotating on circumference parallel to the end face of the bar member.

Abstract: An end face polishing method that can improve polishing accuracy of an end face of a ferrule and increase return loss in opposite connection is to be provided. In the end face polishing method in which the end face of a rod shape member is polished by pressing the rod shape member attached to a jig board to an abrasive member on a polishing board which is supported by a main body of an apparatus to be rotated and oscillated, by using the plurality of abrasive members whose hardnesses are higher than the rod shape member and different from the rod shape member, the end face of the rod shape member is polished with the abrasive members in a manner that the abrasive member is exchanged in the order from that of higher hardness to that of lower hardness.