摘要:
A biaxially stretched polyester film comprising a polyester and zirconium as an internal particle material, produced by polycondensation of terephthalic acid or its esterified derivative and alkylene glycol as the major essential monomeric components in the presence of a polycondensation catalyst, during which zirconium in the form of any compound thereof in an amount of 80 to 2500 ppm in terms of zirconium atom to the polyester as produced being introduced into the reaction system at a stage after the initiation of the reaction and before the intrinsic viscosity of the reaction mixture reaching 0.2, and subjecting the produced polyester to film forming.
摘要:
A process for production of a polyester comprising units of ethylene terephthalate as the major repeating units by supplying terephthalic acid and ethylene glycol continuously or intermittently to bis(beta-hydroxyethyl) terephthalate or its oligomer so as to carry out esterification under a pressure of not more than about 1.0 kg/cm.sup.2, followed by polycondensation, which is characterized in that at least one magnesium compound is incorporated into the reaction system in an amount of about 30 to 400 ppm in terms of Mg to the polyester when the esterification rate in the step of esterification reaches about 20-80% and at least one phosphorus compound is incorporated into the reaction system in an amount as satisfying the following equation (I) at the stage after the esterification rate reaches not less than about 91% and before the termination of the initial condensation in the step of esterification:1.2.ltoreq.Mg/P.ltoreq.20 (I)wherein Mg/P is the atomic ratio of the magnesium atom to the phosphorus atom. The produced polyester shows a high electrostatic adherence.
摘要翻译:一种通过连续或间歇地向双(β-羟乙基)对苯二甲酸酯或其低聚物供应对苯二甲酸和乙二醇作为主要重复单元的聚对苯二甲酸乙二醇酯单元的生产方法,以在不超过一个压力下进行酯化 约1.0kg / cm 2,然后进行缩聚,其特征在于当步骤中的酯化速率在聚酯中时,至少一种镁化合物以约30-400ppm的量掺入反应体系中 的酯化达到约20-80%,并且在酯化速率达到不低于约91%之后且在终止之前的阶段,至少一种磷化合物以满足以下等式(I)的量引入反应体系中 在酯化步骤中的初始缩合:1.2 Mg / P 20(I)其中Mg / P是镁原子与磷酸根的原子比 原子 所生产的聚酯显示出高的静电附着力。
摘要:
An optical pickup includes a lens holder; an objective lens provided on the lens holder and having an effective region for collecting light from a light source and an edge located outer to the effective region; and a lens protector provided on the lens holder. The lens protector protrudes toward an optical disc more than the objective lens. The edge of the objective lens includes a convexed portion protruding toward the optical disc. An apex of the effective region of the objective lens protrudes toward the optical disc more than the convexed portion of the edge. A straight line connecting a part of the edge of the objective lens and a part of the lens protector is closer to the optical disc than the apex of the effective region of the objective lens.
摘要:
One form of evaluation apparatus comprising a plurality of light sources vertically arranged by one side of a carrier line in width direction Y perpendicular to carrying direction X of the carrier line; and a light-receiving section arranged by an opposite side of the carrier line in the width direction Y perpendicular to the carrying direction X of the carrier line. Another form of evaluation apparatus comprising a plurality of light sources capable of irradiating measuring lights of given quantity; means for regulating the quantity of measuring lights from the light sources in accordance with sizes of vegetables and fruits; a light-receiving window of given openness provided in a carrier line, the light-receiving window capable of leading measuring lights having been transmitted through the vegetables and fruits toward a light-receiving section; and means for regulating quantities of transmitted light provided to the light-receiving window, the means for regulating quantities of transmitted light being capable of regulating the openness of the light-receiving window.
摘要:
A semiconductor laser; a light flux separation element that separates a light flux emitted from the semiconductor laser for a first light flux and a second light flux to come out therefrom; an objective lens on which the first light flux coming out from the light flux separation element is incident to be collected on a optical information recording medium; a light-receiving element on which the second light flux coming out from the light flux separation element is incident; an arithmetic circuit that adjusts a quantity of light emitted from the light source in response to a quantity of light incident on the light-receiving element, are provided. A light exiting-surface of the light flux separation element from which the second light flux comes out is laminated to a light incident-surface of the light-receiving element on which the second light flux is incident via an adhesive layer. It is thus possible to adjust a quantity of light at a higher degree of accuracy and higher sensitivity while achieving a significant reduction of the optical head in size.
摘要:
A pallet exchange apparatus for a machine which includes a base, a pallet exchange arm rotatably mounted on the base, a turntable rotatably mounted on the base, an engaging mechanism provided on the turntable and a pallet guide mounted on the turntable. The pallet guide is shifted between a first position where a pallet supported thereon engages with an engaging portion of the pallet exchange arm and disengages from the engaging mechanism and a second position where the pallet engages with the engaging mechanism and disengages from the engaging portion of the exchange arm. The pallet exchange arm is rotated so as to exchange the pallets engaged with the engaging portion thereof between the turntable and a table of the machine.
摘要:
Life of a tool used in a machining center having various sorts of tools can be detected by steps that a tool selection code at every execution of NC program is detected and the current-use tool number is stored, the machining distance of each tool is calculated, the machining distance is accumulated per each tool, the cumulative machining distance is compared with predetermined machining life distance to indicate the life of each tool, and then the life of each tool is determined on the basis of a result obtained in the comparing step.
摘要:
In an electronic device including a temperature sensor and an electronic component which is a heat generation source, the temperature is measured while the influence of heat from the electronic component is reduced. The electronic device includes: a base formed of a resin material; a board which is disposed at one side of the base, and includes an electronic component and a temperature sensor; and a heat sink which is disposed at the other side of the base for dissipating heat generated by the electronic component. The heat sink includes an extension part extending from the other side of the base toward a position of the board at which the electronic component is provided.
摘要:
A light emitting device includes a base, a light-emitting module, and a shielding case. The light-emitting module is fixed to the base via a curved flexible printed-circuit. The shielding case fixed to the base in such a manner that the light-emitting module is held in a position to resist a restoring force of the flexible printed-circuit which is generated by the curve of the flexible printed-circuit. The light-emitting module includes a heat source, and the shielding case includes a projection. The projection controls movement of the light-emitting module in a direction perpendicular to the direction in which the light-emitting module is held by the shielding case. The projection and the light-emitting module are bonded to each other with silicone.
摘要:
A manipulation of the shutter release button mechanism causes the first signal to be detected by the control processor, which selects in turn the still picture mode effecting still picture recording on a data recording medium. A further manipulation of the release button mechanism causes the second signal to be detected by the control processor, which selects in turn the movie picture mode effecting movie picture recording on the data recording medium. In the still picture mode, pixel signals generated by the image sensor are transferred on the frame basis, while in the movie picture mode, pixel signals are transferred on the interlaced field transfer basis. The pixel signals are converted into corresponding digital image data to be stored in the frame memory, from which the control processor read the stored image data. In the still picture mode, a frame of image data is sequentially read out from the memory and compressed as a still image to be recorded on the oprical disk. In the movie picture mode, part of a frame of image data is read out from the memory with any movement of the camera compensated for on the basis of signals obtained from the movement sensor and compressed as movie images to be recorded on the same optical disk.