公开(公告)号：US4894725A

公开(公告)日：1990-01-16

申请号：US167750

申请日：1988-03-15

申请人： Gene K. Sendelweck

发明人： Gene K. Sendelweck

IPC分类号： H04N5/68 ,  H04N5/14

CPC分类号： H04N5/141

摘要： A diode clamp in a kine driver circuit clamps the voltage at the grid (G1) element of a picture tube to a level derived from the voltage at the cathode element of the picture tube. Deriving the grid (G1) voltage from the cathode voltage ensures that if the kine driver amplifier saturates, the voltage applied to the grid (G1) will always be less than that applied to the cathode. Thus, excessive beam current is prevented from flowing immediately following cold cathode turn-on, which excessive beam current would otherwise cause a phenomenon known as "focus flutter".

摘要翻译： 电源驱动电路中的二极管钳位将显像管的栅格（G1）元件处的电压钳位到从显像管阴极元件的电压得到的电平。 从阴极电压导出电网（G1）电压可确保如果电源驱动放大器饱和，施加到电网（G1）的电压将始终小于施加到阴极的电压。 因此，在冷阴极接通之后，防止过大的电流流动，否则过多的电流将导致称为“焦点颤动”的现象。

公开(公告)号：US3898381A

公开(公告)日：1975-08-05

申请号：US43232574

申请日：1974-01-10

申请人： PHILIPS CORP

发明人： AMSEN WILLEM HENDRIK ,  HOVENS PAULUS JOSEPH MARIA

IPC分类号： H04N5/68 ,  H04N5/14 ,  H04N5/59 ,  H04N3/16

CPC分类号： H04N5/141

摘要： A beam current clamping control circuit in which in case of a too large deviation of the desired value of the field frequency measured beam current an accelerated correction of this deviation is effected.

摘要翻译： 一种光束电流钳位控制电路，其中在场频测量的光束电流的期望值的偏差过大的情况下，实现了该偏差的加速校正。

公开(公告)号：US3735039A

公开(公告)日：1973-05-22

申请号：US3735039D

申请日：1971-12-06

申请人： ZENITH RADIO CORP

发明人： TRZYNA W

IPC分类号： H04N5/14 ,  H04N5/00

CPC分类号： H04N5/141

摘要： An excessive beam current indicator circuit in a television receiver for indicating whenever the beam current in a cathoderay tube exceeds a predetermined, maximum ''''safe'''' level. The indicator circuitry utilizes the anode current supplied to the second anode of a cathode-ray tube to develop a voltage drop across a resistor interposed in the anode lead. The voltage drop, representative of the actual beam current, is applied to a switch device, such as a neon bulb, causing it to ignite whenever its firing potential is exceeded. Proper selection of the resistor insures that the neon device will light only when the beam current exceeds the maximum ''''safe'''' level.

摘要翻译： 电视接收机中的过大的光束电流指示器电路，用于在阴极射线管中的束电流超过预定的最大“安全”电平时指示。 指示器电路利用提供给阴极射线管的第二阳极的阳极电流，以在插入在阳极引线中的电阻器上产生电压降。 代表实际光束电流的电压降施加到诸如氖灯等开关装置，使其每当超过其触发电位时点燃。 正确选择电阻器可确保仅当光束电流超过最大“安全”电平时，霓虹灯才会点亮。

公开(公告)号：US3569621A

公开(公告)日：1971-03-09

申请号：US3569621D

申请日：1968-11-29

申请人： ZENITH RADIO CORP

发明人： KRUG ROBERT W

IPC分类号： H04N3/20 ,  H04N5/14 ,  H04N3/18

CPC分类号： H04N5/141 ,  H04N3/20

摘要： A control circuit for preventing the application of accelerating potential in excess of a predetermined maximum value to the cathode-ray picture tube of a television receiver. Positive polarity pulses are amplitude related to the applied accelerating potential derived from the receiver horizontal deflection system and impressed on a neon bulb. When these pulses exceed a predetermined amplitude corresponding to the predetermined maximum value of accelerating potential, the bulb fires and causes a positive bias to be impressed on the control grid of the receiver luminance amplifier. This increases the beam current in the cathode-ray tube, heavily loading down the power supply and preventing the accelerating potential from remaining at an excessive level.

公开(公告)号：US4298886A

公开(公告)日：1981-11-03

申请号：US102685

申请日：1979-12-12

申请人： Geoffrey W. Perkins

发明人： Geoffrey W. Perkins

IPC分类号： H04N5/59 ,  H04N5/14 ,  H04N5/68

CPC分类号： H04N5/141

摘要： A peak beam current leveler for use in a television receiver system which is responsive to the magnitude of the beam current supplied to the cathode of the cathode ray tube (CRT) exceeding a predetermined peak level to adjust the cathode peak beam current accordingly. The cathode beam current is supplied by a gain controlled video amplifier to the cathode through the base-emitter junction of a transistor. The collector electrode of the transistor is connected with a resistor for providing a voltage level proportional to the peak beam cathode current. A comparator circuit is utilized to provide a gain control signal that controls the gain of the gain controlled video amplifier such that the higher the beam current the more gain reduction that occurs. Thus, the level of the peak current is automatically reduced to maintain good focusing of the display on the CRT.

摘要翻译： 一种用于电视接收机系统中的峰值光束电流调节器，其响应于提供给阴极射线管（CRT）的阴极的束电流的大小超过预定峰值电平，以相应地调节阴极峰值电流。 阴极射束电流由增益控制的视频放大器通过晶体管的基极 - 发射极点提供给阴极。 晶体管的集电极连接一个电阻器，用于提供与峰值光束阴极电流成比例的电压电平。 使用比较器电路来提供控制增益控制的视频放大器的增益的增益控制信号，使得波束电流越高发生的增益减小越多。 因此，自动降低峰值电流的电平，以保持显示器在CRT上的良好聚焦。

公开(公告)号：US4200882A

公开(公告)日：1980-04-29

申请号：US929021

申请日：1978-07-28

申请人： Peter J. H. Janssen

发明人： Peter J. H. Janssen

IPC分类号： H04N9/72 ,  H04N5/14 ,  H04N9/20 ,  H04N9/73 ,  H04N17/04

CPC分类号： H04N9/20 ,  H04N5/141

摘要： Multi-gun color television display apparatus having for each gun an identical beam current reference level control system wherein the relative position of a reference level in the video signal and a setting voltage of the electron guns are periodically shifted for obtaining, for the control system outside the measuring periods, a coincidence of the reference level in the video signal and the cut-off point of each of the electron guns for a proper color rendition at a low brightness.

摘要翻译： 对于每个枪具有相同的射束电流参考电平控制系统的多枪彩色电视显示装置，其中视频信号中的基准电平的相对位置和电子枪的设定电压周期性地移位，以获得外部的控制系统 测量周期，视频信号中的参考电平与每个电子枪的截止点的一致性，用于在低亮度下进行适当的色彩再现。

公开(公告)号：US3674932A

公开(公告)日：1972-07-04

申请号：US3674932D

申请日：1971-02-16

申请人： RCA CORP

发明人： GRIEPENTROG DAL FRANK

IPC分类号： H04N5/14 ,  H04N5/19 ,  H04N5/58

CPC分类号： H04N5/141

摘要： A normally saturated transistor having its collector electrode serially coupled with the brightness control for a television kinescope, its emitter electrode grounded, and its base electrode coupled to sense the amount of current flowing through such device is effective to dynamically adjust the direct current bias of the video signal chain when that current exceeds a predetermined value, with the change in bias being in an offsetting direction to reduce the kinescope drive. Such an arrangement proves advantageous in eliminating the need for a brightness limiter control potentiometer- of the type utilized in U.S. Pat. No. 3,541,240, for example-which, though normally preset prior to delivery of the receiver to a purchasing customer, could become misadjusted and result in damage to the television picture tube.

公开(公告)号：US3612756A

公开(公告)日：1971-10-12

申请号：US3612756D

申请日：1969-04-24

申请人： HITACHI LTD

发明人： AKATSU MITSUHARU ,  YONEYAMA TAKAO ,  IWASAKI TADAHIKO

IPC分类号： H04N5/14 ,  H04N9/28

CPC分类号： H04N5/141

摘要： A beam current limiting circuit for a cathode-ray tube (CRT) having at least a cathode, a grid and an anode comprising an anode circuit having a fly back transformer including a primary coil and a secondary coil, a power source, a high voltage rectifier for rectifying flyback pulses generated across the secondary coil, a beam current responsive means inserted between the power source and the secondary coil, a grid bias means, and switching means. The beam current responsive means is connected to the switching means and generates a control voltage whose value is so determined to be lower than the grid bias voltage while the beam current is larger than a predetermined value. The switching means is responsive to the control voltage and changes its conductive or nonconductive condition to supply the control voltage to the grid when the beam current exceeds the predetermined value, so that the beam current is prevented from exceeding the predetermined value.

公开(公告)号：US3598913A

公开(公告)日：1971-08-10

申请号：US3598913D

申请日：1968-12-18

申请人： PHILIPS CORP

发明人： JANSSEN PETER JOHANNES HUBERTU

IPC分类号： H04N5/14 ,  H04N5/18 ,  H04N5/16

CPC分类号： H04N5/185 ,  H04N5/141

摘要： This invention relates to a control circuit for a television receiver which features a gated circuit which passes the flyback signal a different selected amount than the video intensity signal. Therefore, the ratio of the flyback signal to that of intensity signal is controllable. The flyback signal is used to control the beam current intensity by use of a rectifier circuit.

公开(公告)号：US20140197314A1

公开(公告)日：2014-07-17

申请号：US13752291

申请日：2013-01-28

申请人： AVIGILON CORPORATION

发明人： Sina Afrooze ,  Michael Neufeld ,  Guoqian Sun ,  Piotr Celler ,  Colin Janssen ,  Jeremy Hale ,  Frederick Ramsay

IPC分类号： H05B37/02 ,  G01J5/10

CPC分类号： H05B37/02 ,  G01J5/10 ,  G06K9/00771 ,  H04N5/141 ,  H04N5/2256 ,  H04N5/23296 ,  H04N5/2354 ,  H04N5/33 ,  H05B33/0842 ,  H05B37/0227

摘要： A method for generating an infrared (IR) beam for illuminating a scene to be imaged comprises providing at least two IR emitters, including a first IR emitter operable to emit a wide beam component of the IR beam, and a second IR emitter operable to emit a narrow beam component of the IR beam, wherein the wide beam component has a linear profile that has a lower standard deviation than a linear profile of the narrow beam component. The method also comprises selecting a desired linear profile for the IR beam, and selecting a power ratio of power directed to the first IR emitter and power directed to the second IR emitter that produces the IR beam with the desired linear profile when the narrow beam component and wide beam component are combined; and directing power to the first and second IR emitters at the selected power ratio to generate the wide and narrow beam components, and combining the generated wide and narrow beam components to produce the IR beam.

摘要翻译： 用于产生用于照亮要成像的场景的红外（IR）光束的方法包括提供至少两个IR发射器，其包括可操作以发射IR光束的宽光束分量的第一IR发射器，以及可操作以发射的第二IR发射器 IR光束的窄光束分量，其中宽光束分量具有比窄光束分量的线性轮廓具有更低的标准偏差的线性轮廓。 该方法还包括为红外光束选择期望的线性分布，以及当窄光束分量（λ）和光束分量（λ）被选择时，选择指向第一IR发射器的功率的功率比和指向第二IR发射器的功率，其产生具有期望线性分布的IR光束 并组合宽光束分量; 并以所选择的功率比将功率引导到第一和第二IR发射器，以产生宽而窄的波束分量，以及组合产生的宽和窄波束分量以产生IR波束。