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    • 1. 发明专利
    • Monogrammic signalling device
    • GB1047668A
    • 1966-11-09
    • GB1914565
    • 1965-05-06
    • WILLIAM ROSS AIKEN
    • G09F9/37G09G3/16G09G3/34
    • 1,047,668. Monogrammic signs. W. R. AIKEN. May 6, 1965 [June 1, 1964], No. 19145/65. Heading G5C. A monogrammic sign comprises rows and columns of units U each including a vane 14 movable from a horizontal to an inclined position by applying electric potential to side electrodes 20a, 20b of all the units in the associated row, and thence to a substantially vertical, exposed position by applying potential to top electrodes 24 of the units in the associated column. A transparent viewing window may be of conductive material or have a conductive edging 44 for holding the vane in exposed position or repelling it to concealed position. As shown, control means for activating selected units includes punched tape movable between (a) conductive bars and terminals resiliently urged into contact therewith (Fig. 4, not shown), or (b) light-emitting blocks and photo-sensitive cells (Fig. 7, not shown). The vane 14 may be of metal foil or regenerated cellulose.
    • 2. 发明专利
    • Automatic volume control
    • GB1125678A
    • 1968-08-28
    • GB582467
    • 1967-02-07
    • WILLIAM ROSS AIKEN
    • G05F1/12G05F1/44G05F1/652H03G1/00H03G3/20H03G3/30H03G7/06H03G11/02
    • 1,125,678. Automatic volume control. W. R. AIKEN. 7 Feb., 1967, No. 5824/67. Heading H4R. An automatic volume control arrangement 10 comprises a line 14 to which is applied an input such as a speech signal 42; a variable attenuator constituted by a fixed resistor 12 and a photo-sensitive resistor 16; an output line 20; a lamp 22 for illuminating the resistor 16; a power circuit for the lamp 22 including a transistor 24 which is regulated, in response to output variations, by a first control signal derived from the output line 20 by way of a potentiometer 30, a rectifier having a tansistor 32, and a line 33; and a circuit, including the series connection of a resistor 40 and a capacitor 40, from which is derived a second control signal of lesser value than the first, this second signal being held at the control transistor 24 for a predetermined duration upon decline of the said first control voltage. In operation, when the input signal increases suddenly the first control voltage likewise increases suddenly to cause transistor 24 to conduct strongly, whereby the brightness of the lamp rapidly increases and the output is attenuated; the control current surge also charges capacitor 36, but because of the presence of resistor 40, the capcitor voltage will not reach the magnitude of the first control voltage. After the output signal has dropped to its desired level, the initial surge of control current disappears, but the capacitor 36 then discharges and maintains a somewhat lower and gradually decreasing control voltage at the base of transistor 24 so that the flow of current through the lamp 22 is maintained for a limited time at the level required to hold the output within the desired limits, thereby preventing premature release of the control exercised on the input signal. A rheostat 26, is connected across the collector/emitter circuit of transistor 24 and is so adjusted that the lamp 22 is held on the threshold of illumination when no control signal is present on the base of the transistor.
    • 3. 发明专利
    • Voltage stabilizer
    • GB1092129A
    • 1967-11-22
    • GB3173465
    • 1965-07-26
    • WILLIAM ROSS AIKEN
    • G05F1/12G05F1/44G05F1/652
    • 1,092,129. Automatic voltage control. W.R. AIKEN. July 26, 1965 [July 27, 1964], No. 31734/65. Heading G3R. A voltage stabilizer includes a photosensitive resistor 12 responsive to a lamp 20 whose degree of illumination is dependent upon output voltage variations, so that changes in the alternating output voltage on line 18, caused by a varying input signal on terminal 14, produce corresponding corrective changes in the resistance of element 12 whereby the output voltage tends to remain constant. The lamp 20 is supplied from a source 9 by way of a transistor 22 which is controlled by a further transistor 26 responsive to output voltage variations as detected by a circuit R which includes a rectifier; the control voltage from transistor 26 is applied to the base of transistor 22 over a differentiating circuit 30, 32, 34, so that the arrangement is also responsive to the rate of change of voltage on output line 18.