摘要:
A method for manufacturing an optical fiber comprises setting a heating condition for heating a glass rod, which is a parent material of the optical fiber, and an elongating speed of the glass rod based on a prescribed numerical value which changes with a progress of elongation of the glass rod; heating and elongating the glass rod to generate a preform based on the heating condition and the elongating speed which are set by the setting; and drawing the preform to a filament-like form by further heating the preform to generate the optical fiber.
摘要:
A method for fusing an optical fiber preform comprises fusing the preform while blowing an oxidative gas against the preform to be fused from upper and lower directions of a fusing burner unit. An apparatus for carrying out the method includes a plurality of nozzles for preventing deposition of silica cloud, which are each set at an angle, &thgr;, of blowing the oxidative gas relative to the preform being drawn such 20°≦&thgr;≦60°.
摘要:
A heat treatment device of the light irradiation type with a long service life, in which effective, adequate cooling of the lamps (10) prevents devitrification of the lamp emission portion, even if the power supplied to the lamps is increased to accelerate the temperature increase of the wafer, is achieved by the provision of air injection lines (14) in a mirror (11), in which the lamps are mounted, for blowing in air into the vicinity of the lamps (10), and at least one air exhaust line (23) for evacuation of air from the vicinity of the lamps (10).
摘要:
A process and device are provided for controlling a gap between a mask and a workpiece in a proximity exposure device in which there are only a few processes of measurement of the exposure gap and parallel adjustment, in which even for a large workpiece the gap between the mask and the workpiece can be controlled without contact of the workpiece with the mask, and in which no special skill is needed to adjust the gap. The process and device includes moving a workpiece carrier composed of a first movement device and a second movement device, the latter being located on a carrier driven by the first movement device and consisting of several workpiece carrier support parts which move the workpiece carrier up and down and control its slope. The size of the gap between the bottom of a mask and the top of a workpiece located on the workpiece carrier is measured at several locations. Based on the size of the gap, the positions of the workpiece carrier support parts, when the several workpiece carrier support parts move, are recorded as a parallel zero point in a control element. The motion of the workpiece carrier support parts is executed such that the workpiece carrier is located parallel to the mask. When starting to use the device, the workpiece carrier support parts are each in a standby state after they have been moved to the parallel zero points recorded in the control element. When the workpiece is being exposed, it is placed on, and held securely to, the workpiece carrier and raised by means of the first movement device until the alignment gap position is reached.
摘要:
Disclosed is a SCARA robot having a robot body, a mount movable vertically of the robot body, a first arm having one end operatively connected to the mount such that the first arm may turningly move in a horizontal plane, a second arm having one end operatively connected to the opposite end of the first arm such that the second arm may turningly move in a horizontal plane, and an R shaft rotatably mounted on the free end of the second arm, wherein stepping motors 12, 22, 32 and 42 are provided to move the first and second arms, the R-shaft and the mount respectively, and encoders are provided to count the stepping pulses of the stepping motors. The counted pulses are feedbacked to CPU1 so that the CPU1 may correct errors when the errors are detected between the counted number of pulses and a required number of pulses. When the errors are detected, the stepping motors may be stopped and the errors may be indicated.
摘要:
A disk brake in which a cylinder bore of a caliper is decentered toward the exit side in the rotational direction of a disk with respect to friction pads, and claw portions of the caliper are also decentered toward the exit side with respect to the friction pads. The entrance-side and exit-side claw portions have approximately the same wall thickness in the circumferential direction of the disk. When the brake is activated, the claw portions exhibit approximately the same rigidity so that the surface pressure of each claw portion pressing the outer friction pad can is kept uniform, and non-uniform.
摘要:
A disk brake mounting member having a pair of left and right arms spaced apart from each other in the circumferential direction of a disk. A pair of left and right pin holes are formed in the left and right arms, respectively, with different bore diameters. The pin holes are fitted with sliding pins, respectively, which support a caliper slidably in the axial direction of the disk. The arms are previously provided with left and right projections near the respective open ends of the pin holes so as to be in symmetry with each other. At least one of the projections is formed into a shape different from that of the other when the pin holes are formed in the arms by machining. Also disclosed is a method of producing the disk brake mounting member. According to this method, a mounting member is first cast to have left and right projections. One of the projections is then cut off.
摘要:
A disc brake mounting member has a pair of mounts to be secured to a non-rotating part of a vehicle on one side of a disc rotatably provided in the vehicle. The mounting member also has a pair of arms positioned on the outer side of the mounts in a radial direction of the disc for supporting a caliper so that the caliper can slide in the direction of the axis of the disc. The mounts are integrally formed with abutting surfaces, installation holes, and projections. Projections function as stoppers to be engaged by the non-rotating part of the vehicle when the mounting member is inserted between the disc and the non-rotating part.
摘要:
There is provided a photomultiplier in which a transmittance of an incident light and a photosensitivity is high and a hysteresis characteristic is excellent. Therefore, in the present invention, a photocathode 16, dynodes 17a to 17c and an anode 18 are supported between insulating material substrates 12a and 12b provided in a glass bulb 11. A transparent conductive film 19 is formed on an inside wall surface of a light entrance portion 15. The transparent conductive film 19 electrically contacts with a pad 20 which is led through a terminal 14 to the outside. The same potential as the photocathode 12 is applied through the pad 20 to the transparent conductive film 19. The incident light directly impinges on the photocathode 16 through the glass bulb 11 and the transparent conductive film 19 at a place corresponding to the light entrance portion 15. As a result, the incident light reaches the photocathode 12 with not being interfered at all, and the transmittance of the incident light is improved. Since a predetermined potential is applied to the transparent conductive film 19, the change of the potential of the inside wall surface of the glass bulb 11 is performed at high speed, and the hysteresis becomes extremely small.
摘要:
A friction pad for a disk brake is designed so that a wear sensor can be firmly secured to the friction pad. A circular cylindrical projection is formed on a backing plate of the friction pad by extrusion so that a wear sensor adapted to sound an alarm by coming in contact with a disk is fitted onto the projection and secured to the backing plate by caulking the projection. The projection is so deformed that the diameter d.sub.1 and height h.sub.1 of a resulting radially enlarged portion satisfy the relationship of (d.sub.1 -3.4).times.h.sub.1 .gtoreq.2.5, thereby preventing rotation of the wear sensor and rising of the enlarged portion.