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    • 1. 发明授权
      US4112460A Simplified bias and gain adjust system for color cathode ray tube 失效
    • Simplified bias and gain adjust system for color cathode ray tube
    • 彩色阴极射线管简化偏置和增益调整系统
    • US4112460A
    • 1978-09-05
    • US792610
    • 1977-05-02
    • Blayne E. Arneson
    • Blayne E. Arneson
    • H04N9/73 , H04N9/52 , H04N9/537
    • H04N9/73
    • There is disclosed a simplified bias and gain adjust system for a color cathode ray tube wherein, by a minimum of adjustments, the bias for an in-line color cathode ray tube may be adjusted to achieve color balance between the CRT's three electron guns and to achieve a maximum voltage difference between the CRT's G.sub.2 electrode and the cathode element of the dominant electron gun of the color CRT. In particular, the system includes a chrominance matrix amplifier including an amplifying element in the form of a transistor for each of the color-difference signals provided by the chrominance demodulator(s) of the color television system; the color-difference signal is applied, illustratively, to the base of each such transistor, and a luminance signal Y is applied to the emitter of each such transistor element. In particular, first and second supply voltages are applied, respectively, through a first fixed resistor and a second variable resistor to each transistor's collector the second voltage source being less than the first-mentioned voltage source. By varying the second-mentioned resistor element, the load and therefore the gain of the transistor, as well as the effective supply voltage developed at the transistor's collector, are established. In an embodiment wherein such an amplifying circuit is adapted for a three-gun cathode ray tube, a common, second variable resistor is interconnected between the collectors of at least two of the driver transistors and is adjusted to differentially control the gain and the supply voltages of the two driver transistors.
    • 公开了一种用于彩色阴极射线管的简化的偏置和增益调整系统，其中通过最小的调整，可以调整直线式彩色阴极射线管的偏压，以实现CRT的三电子枪之间的色彩平衡和 实现CRT的G2电极和彩色CRT的主电子枪的阴极元件之间的最大电压差。 特别地，该系统包括色度矩阵放大器，其包括晶体管形式的放大元件，用于由彩色电视系统的色度解调器提供的每个色差信号; 示例性地将色差信号施加到每个这样的晶体管的基极，并且将亮度信号Y施加到每个这种晶体管元件的发射极。 特别地，第一和第二电源电压分别通过第一固定电阻器和第二可变电阻器施加到每个晶体管的集电极，第二电压源小于首先提到的电压源。 通过改变第二个提到的电阻元件，建立了晶体管的负载和因此的增益，以及在晶体管的集电极处产生的有效电源电压。 在其中这种放大电路适用于三枪阴极射线管的实施例中，公共的第二可变电阻器互连在至少两个驱动晶体管的集电极之间，并被调节以差分地控制增益和电源电压 的两个驱动晶体管。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 2. 发明授权
      US4100578A AFT summing circuit for varactor-type tuning systems 失效
    • AFT summing circuit for varactor-type tuning systems
    • 变容二极管调谐系统的AFT求和电路
    • US4100578A
    • 1978-07-11
    • US793364
    • 1977-05-03
    • Blayne E. Arneson
    • Blayne E. Arneson
    • H03J7/06 , H03J7/12 , H04N5/50 , H04B1/16
    • H03J7/12 , H03J7/065
    • There is disclosed an AFT summing circuit for a varactor-type tuning system and in particular for such a tuning system including a UHF tuner and a VHF tuner. A tuning voltage derived from a suitable source indicative of the desired channel or station to be tuned is applied to one input of the AFT summing circuit, while an error signal as derived from an AFT circuit is applied to the other input, to be summed together in a manner whereby the effect of the AFT signal may be adjusted without affecting the tuning voltage. The AFT circuit output is applied at a first level when the VHF tuner is operative, and at a second attenuated level when the UHF tuner is operative. In particular, the AFT summing circuit includes first and second impedance elements for applying the AFT circuit output to first and second input terminals of an operational amplifier, and a third impedance element for applying the tuning voltage to the second input terminal. A fourth impedance element is connected in a feedback loop from the output of the operational amplifier to the first input terminal. The values of the first, second, third and fourth impedances Z.sub.1 , Z.sub.2, Z.sub.3 and Z.sub.4 are selected to satisfy the following equation in order that a substantially predetermined gain is provided to the tuning voltage, regardless of the adjustments made to the AFT circuit output: ##EQU1## Further, there is included means for applying a variable control or gain to the correction signal component of the output of the operational amplifier.
    • 公开了一种用于变容二极管型调谐系统的AFT求和电路，特别是用于包括UHF调谐器和VHF调谐器的这种调谐系统。 从指示要调谐的期望信道或站的合适的源导出的调谐电压被施加到AFT求和电路的一个输入端，而从AFT电路导出的误差信号被施加到另一个输入端，被加在一起 可以在不影响调谐电压的情况下调整AFT信号的效果。 当VHF调谐器工作时，AFT电路输出以第一电平施加，并且当UHF调谐器工作时处于第二衰减电平。 特别地，AFT求和电路包括用于将AFT电路输出施加到运算放大器的第一和第二输入端的第一和第二阻抗元件，以及用于将调谐电压施加到第二输入端的第三阻抗元件。 第四阻抗元件连接在从运算放大器的输出到第一输入端的反馈回路中。 选择第一，第二，第三和第四阻抗Z1，Z2，Z3和Z4的值以满足以下等式，以便对调谐电压提供基本上预定的增益，而不管对AFT电路输出 此外，还包括将可变控制或增益应用于运算放大器的输出的校正信号分量的装置。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 3. 发明授权
      US4090274A Gravity door closer 失效
    • Gravity door closer
    • 重力门关闭
    • US4090274A
    • 1978-05-23
    • US752651
    • 1976-12-20
    • Jack Bourgeois
    • Jack Bourgeois
    • E05D7/08 , E05F1/06
    • E05D7/081 , E05F1/063 , E05Y2900/31 , F25D2323/024 , Y10T16/53992
    • A gravity door closer for a refrigerated cabinet having a storage area to which access is gained through a door pivotable between an open position and a closed position about a vertical axis defined by upper and lower hinge units wherein a pair of vertically telescoping journalled bushings have hubs respectively mounted in openings formed in the lower surface of the door and a bracket on the cabinet, the bushings including a plurality of intermeshing circumferentially spaced camlobes defined by converging side walls terminating at flat tip walls, the side walls interengaging in the closed position and a predetermined open position such that the weight of the door tends to cause the camlobes to bottom in the grooves therebetween to establish detent positions, the flat tip walls of the camlobes contacting providing infinite door positioning in a sector between said detent positions, the torque applied to the bushings tending to rotate the same in the openings being resisted by torque arms attached to the door and the bracket at locations spaced from the hubs thereby avoiding localized shearing of the material thereabout.
    • 一种用于冷藏柜的重力门关闭装置，其具有通过可由围绕由上下铰链单元限定的垂直轴线在打开位置和关闭位置之间枢转的门而进入的存储区域，其中一对垂直伸缩的轴颈衬套具有毂 分别安装在形成在门的下表面中的开口和机柜上的支架上，衬套包括多个相互啮合的圆周间隔开的凸起，所述多个相互啮合的周向间隔开的突出部限定在终止于平坦顶端壁处的会聚侧壁，在闭合位置相互接合的侧壁和 预定的打开位置，使得门的重量倾向于使凸轮在它们之间的凹槽中的底部以建立制动位置，凸起的平坦顶端接触提供无限门定位在所述制动位置之间的扇区中，施加到 倾向于在开口中旋转的衬套被转矩臂抵抗 在与轮毂间隔开的位置处附接到门和支架，从而避免了其周围材料的局部剪切。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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