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公开(公告)号：US4970429A
公开(公告)日：1990-11-13
申请号：US843368
申请日：1986-03-24
CPC分类号： H01J29/563
摘要： Picture pickup device comprising a television camera tube having an electron gun, and a photo-sensitive target in an evacuated envelope. An electron beam generated by the electron gun is focused by focusing means onto the target. The electron beam is deflected by deflection means and describes a line raster across the target. The electron beam forms an elongated spot on the target. The longitudinal axis of the spot is perpendicular to the lines of the raster and has a length which is substantially equal to the line spacing. The elongated spot is obtained with the aid of an adjustable multipolar stigmator which, viewed in the direction of propagation of the electron beam, is provided in front of the focusing and deflection means, coaxially around the axis of the envelope and the electron gun. The shape of the spot can be adjusted in an optimum manner so that stern waves are completely suppressed. It is possible to provide the stigmator in or around the tube and to adjust it by magnetization, if required, through the wall of the envelope.
摘要翻译： 图像拾取装置包括具有电子枪的电视摄像机管和在真空外壳中的光敏靶。 由电子枪产生的电子束通过聚焦装置聚焦在靶上。 电子束被偏转装置偏转，并描绘了目标上的线条光栅。 电子束在靶上形成细长的斑点。 光点的纵轴垂直于光栅的线，其长度基本上等于线间距。 借助于可调节的多极点阵器，在电子束的传播方向上观察，在聚焦和偏转装置的前面，同轴地设置在外壳和电子枪的轴线上，获得细长的光点。 可以以最佳方式调整光斑的形状，使得尾部波被完全抑制。 可以在管内或周围提供标示器，并且如果需要，通过信封的壁通过磁化进行调节。
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公开(公告)号：US4966614A
公开(公告)日：1990-10-30
申请号：US158081
申请日：1988-02-16
IPC分类号： C03B19/14 , C03B37/018 , C03C17/02 , C23C16/04
CPC分类号： C23C16/045 , C03B37/0183 , C03B37/01884 , C03C17/02
摘要： In the P.C.V.D. process, in principal the quartz tube need not be rotated during the deposition of the glass layers. However, it has been found in practice that an improvement in the quality of the glass fibers can be obtained if the quartz tube is rotated regularly over an angle of 360.degree./n. n is preferably equal to an integer from 2 to 12.
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公开(公告)号：US4965711A
公开(公告)日：1990-10-23
申请号：US501399
申请日：1990-03-27
IPC分类号： H03H19/00
CPC分类号： H03H19/004
摘要： A switched capacitor network includes an input terminal (2) an output terminal (2), a series arrangement of a first and a second switching transistor, each having a control electrode (S.sub.1) for receiving a first (S.sub.1 ) and a second switching signal, respectively, and a capacitance between the junction point of the two switching transistors and a point of constant potential. The two switching transistors have a zone in common and the capacitance (S.sub.s) is exclusively constituted by the parasitic capacitance of the zone (17). This structure results in a switched capacitor network with an increased time constant.
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公开(公告)号：US4956565A
公开(公告)日：1990-09-11
申请号：US337021
申请日：1989-04-12
IPC分类号： H03K17/61 , H03F1/32 , H03K17/615
CPC分类号： H03F1/32
摘要： A transistor output stage including an output transistor having its base coupled to the emitter of a driver transistor is driven into saturation by a current source which is connected to the base of the driver transistor. When a small output current is flowing through the load connected to the collector of the output transistor, the surplus of the current from the current source is drained from the base of the driver transistor to the collector of the output transistor via the collector-emitter path of a limiting transistor having its base connected to the base of the output transistor. This reduces the power dissipation in the driver transistor and improves the power efficiency of the transistor output stage.
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公开(公告)号：US4956554A
公开(公告)日：1990-09-11
申请号：US302716
申请日：1989-01-26
申请人： Geoffrey Baker , Roger Pearce , Paul L. Williamson
发明人： Geoffrey Baker , Roger Pearce , Paul L. Williamson
CPC分类号： H01L37/02 , G01J5/34 , H01L2224/48091 , H01L2224/73204 , H01L2224/73265
摘要： An infra-red radiation detector has a pyroelectric element (10), comprising for example TGS material, supported in spaced relationship over a heatsink body (16) for stabilizing the temperature of the element in operation with the space between opposing faces of the element (10) and body (16) containing a thermally-conductive, non-hardening and non-gaseous gel-like medium (22) such as silicon dielectric gel which thermally couples the element with the body. A small quantity of material such as solder or epoxy may be used to bond the element to the body and fix the spacing therebetween or, alternatively, the element may be supported over and bonded to the body simply by means of the medium (22) itself. Capillary action may conveniently be used to introduce the medium into the space between the element and the body.
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76.发明授权
公开(公告)号：US4953024A
公开(公告)日：1990-08-28
申请号：US347314
申请日：1989-05-03
申请人： Gaetano Caronna
发明人： Gaetano Caronna
CPC分类号： H04N19/50
摘要： In a predictive encoding circuit the transmission of prediction errors to the predictive decoding circuit is selectively suppressed and prediction errors having a predetermined value are applied to the prediction circuit in both the encoding circuit and in the decoding circuit, instead of the non-transmitted prediction errors. In order to determine which prediction errors are not transmitted, a masking function value is determined for an actual pixel in the encoding circuit. This is a linear combination of weighted difference between two pixel values of a predetermined cluster of pixels located in the vicinity of the actual pixel. The actual prediction error is not transmitted only if, for example this masking function value is within a certain range and the previous prediction error has been transmitted. In the decoding circuit the masking function values are determined, starting from the regained local pixel values.
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公开(公告)号：US4951292A
公开(公告)日：1990-08-21
申请号：US371876
申请日：1989-06-26
CPC分类号： H01S5/227 , H01S5/028 , H01S5/12 , H01S5/2277
摘要： In DFB/DBR semiconductor diode lasers, competition may arise between the DFB (Distributed Feed-Back) mode corresponding to the period of the grid present and the FP (=Fabry-Perot) mode determined by the relative distance of the mirror surfaces, as a result of which the laser does not operate in one single mode. By providing an antireflex layer, this problem is suppressed, but other disadvantages are obtained, such as a large line width. However, by providing a phase layer on the antireflection coating, the operation of the laser in a single mode is combined with a comparatively narrow line width. Furthermore, a reflective coating can be applied to the phase layer. In this case, both the module and the phase of the effective reflection can be adjusted substantially independently of each other, as a result of which a narrow line width and SLM can be more readily combined.The antireflex coating, the phase layer and the reflective coating can be manufactured by means of not more than two materials having a suitable refractive index. Two particularly suitable materials are hafnium oxide and silicon dioxide, which can be applied to the mirror surfaces by means of the comparatively simple and attractive vapor deposition technique.
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公开(公告)号：US4951003A
公开(公告)日：1990-08-21
申请号：US352421
申请日：1989-05-16
申请人： Willem De Jager , Evert Seevinck
发明人： Willem De Jager , Evert Seevinck
CPC分类号： H03F3/45089 , H03F1/3211
摘要： A amplifier circuit comprises first transistor (T.sub.1) and a second transistor (T.sub.2) whose emitters are each connected via a first resistors (R.sub.1) to a point (2) which is connected to the power-supply terminal (3) by means of a current source (1). The bases of said transistors are connected to input terminals (4,5) and via a second resistor (R.sub.2) each to the base of a third transistor (T.sub.3) whose emitter is connected to the terminal (2). The linearity of the circuit is improved by arranging a fourth transistor (T.sub.4) and a fifth transistor (T.sub.5) in series with the collector-emitter paths of the first transistor (T.sub.1) and the second transistor (T.sub.2) which fourth and fifth transistor have their bases connected to a reference terminal (7) and have their emitters interconnected by means of a third resistor (R.sub.3).
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公开(公告)号：US4949460A
公开(公告)日：1990-08-21
申请号：US301918
申请日：1989-01-13
申请人： Olivier Sterk
发明人： Olivier Sterk
IPC分类号： B26B19/20
CPC分类号： B26B19/20
摘要： A hair trimmer is provided having a housing provided with a stationary cutter and a cutter which can be driven relative to the stationary cutter, the housing comprising a comb attachment which is adjustable relative to the housing. The housing is provided with a rotatable annular adjusting element which forms part of a spiral-groove coupling between the housing and the comb attachment.
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公开(公告)号：US4946248A
公开(公告)日：1990-08-07
申请号：US179106
申请日：1988-04-08
申请人： Ulrich Grzesik , Erich Schurmann
发明人： Ulrich Grzesik , Erich Schurmann
CPC分类号： G02B6/3855 , G02B6/245 , G02B6/3838 , G02B6/3652
摘要： The connection end of a light waveguide (LWG) is bonded to a holder for use in coupling the LWG to a plug connector. Two axially extending centering surfaces are provided which enable aligning the connection end of the LWG in a guide groove of the connector. Such centering surfaces are exposed axial zones of the glass sheath layer of the LWG, in which zones the outer primary coating of the LWG have been removed. Removal thereof is preferably effected by a cutting tool.
摘要翻译： 光波导（LWG）的连接端与用于将LWG耦合到插头连接器的支架结合。 提供了两个轴向延伸的对中表面，其使得LWG的连接端能够对准连接器的引导槽。 这种定心表面是LWG的玻璃护套层的暴露的轴向区域，其中已经去除了LWG的外部初级涂层。 其切割优选通过切削工具实现。
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