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1. 发明专利

JPS61234182A TELEVISION RECEIVER 失效
公开(公告)号：JPS61234182A
公开(公告)日：1986-10-18
申请号：JP7461985
申请日：1985-04-09
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OTSUJI MINORU
IPC分类号： H04N5/64
摘要： PURPOSE:To obtain a good video image having no interference on a picture plane of a cathode ray tube by directly connecting a conductive film outside the cathode ray tube to an earth of a power circuit by a lead wire to prevent an interference signal generated on the conductive film outside the cathode ray tube from entering a video image amplifying circuit. CONSTITUTION:A grounding conductive wire 2 formed in a U-shape is contacted with an outer conductor 5 made of graphite of a cathode ray tube 1 and therefrom in one way, connected to an earth of a printing plate 4 of a neck section by an earth wire 3. In the other way, it is connected to an earth of a print plate of a power circuit 9 by another earth wire 7 through a resistor 8 having an impedance below 100OMEGA for instance, 10OMEGA on the print plate. According to the above-mentioned construction, an unnecessary voltage produced on the conductive film outside the cathode ray tube is flowed to the earth of the power circuit to reduce the influence of the interference to the neck print and thereby obtain a good quality of a picture image. For a distance pulse in the tube, the pulse below 100OMEGA is prevented from entering a signal system circuit to prevent the destruction of a semiconductor element of the signal system circuit.

2. 发明专利

JPH02154574A HORIZONTAL POSITION CORRECTION CIRCUIT 失效
公开(公告)号：JPH02154574A
公开(公告)日：1990-06-13
申请号：JP30799088
申请日：1988-12-06
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OTSUJI MINORU
IPC分类号： H04N3/227
摘要： PURPOSE:To form an excellent picture without horizontal position dislocation by providing a DC feedback circuit between a flyback transformer and the time constant terminal of a horizontal oscillation circuit. CONSTITUTION:One terminal of a resistor R14 is connected to a high voltage winding negative terminal 28 in a DC negative feedback circuit and the other terminal is connected to the center terminal of a variable resistor R11. A negative voltage proportional to a beam current caused across the high winding negative terminal 28 connecting to the resistor R14 is applied to the horizontal oscillator time constant terminal 29 when the beam current is increased. That is, the fluctuation of the horizontal oscillating frequency caused by the phase distortion of a horizontal pulse due to the increase in the beam current is neutralized by applying the negative voltage proportional to the beam current through the proper selection of the resistance to the resistor R14 so as to keep the oscillating frequency constant. Thus, the dislocation in the horizontal center is prevented and an excellent pattern is obtained.

3. 发明专利

JPS63257810A POWER SUPPLY PROTECTING CIRCUIT 失效
公开(公告)号：JPS63257810A
公开(公告)日：1988-10-25
申请号：JP9250287
申请日：1987-04-15
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OTSUJI MINORU
IPC分类号： G05F1/56
摘要： PURPOSE:To prevent a power supply circuit from abnormal temp. rise at the time of shorting a load by allowing a Zener diode inserted between the I/O terminals of the titled circuit to fuse a fuse based on a breakdown phenomenon of a power supply circuit due to the shorting of the load. CONSTITUTION:The Zener diode D21 is prepared for equivalently reducing the internal impedance of the power supply circuit at the time of shorting the load and the cathode and anode of the diode D21 are respectively connected to the fuse H21 side of a resistor R21 and the emitter of a TR Q21. Since an operation voltage when the current of the diode D21 is 20mA is 6V when a voltage to be applied to the diode D21 is 5V e.g., the diode D21 is cut off. Since a load resistor R31 is shorted, a high voltage is impressed to the diode D21, so that the diode D21 is conducted at a low impedance and the fuse H21 is instantaneously conducted and fused.

4. 发明专利

JPH0210975A AUTOMATIC BEAM CURRENT LIMITING CIRCUIT 失效
公开(公告)号：JPH0210975A
公开(公告)日：1990-01-16
申请号：JP16010388
申请日：1988-06-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OTSUJI MINORU
IPC分类号： H04N5/59
摘要： PURPOSE:To realize a circuit without oscillation caused due to a rapid change in a beam current by providing a negative feedback circuit of an AC component in a feedback circuit of a detection voltage to a video amplifier circuit. CONSTITUTION:The circuit consisting of a capacitor C13, a diode D12 and a resistor R17 is an AC negative feedback circuit and a parallel circuit comprising the diode D12 and the resistor R17 is connected in series with the capacitor C13. The negative side of the capacitor C13 is connected to a cross point between a resistor R14 and a resistor R15, the cathode of the diode D12 is connected to a terminal 18 and the AC change component of the negative voltage caused at the terminal 18 is fed to the cross point between the resistors R14 and R15 through the capacitor C13 from the diode D12. The negative AC feedback circuit is provided to apply the AC change component of the negative voltage caused at the terminal 18 to the capacitor C12 quickly, then the response of the negative feedback circuit is quickened.

5. 发明专利

JPS62287709A PULSE GENERATING CIRCUIT 失效
公开(公告)号：JPS62287709A
公开(公告)日：1987-12-14
申请号：JP13234986
申请日：1986-06-06
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OTSUJI MINORU
IPC分类号： H03K3/57 , H04N3/20
摘要： PURPOSE:To generate a single pulse at the off-state of a power switch by one power supply circuit by discharging an electric charge of a capacitor through a transistor at the time of power switch OFF and obtaining a single pulse from its collector. CONSTITUTION:In closing a power switch 2, a voltage Ev is charged in the capacitor 8 momentarily through a diode 7. In opening the power switch 2, since a resistor 6 is connected to an output terminal 4 of a power supply circuit 3, the voltage at the terminal 4 is decreased with a time constant. When the output voltage of the terminal 4 is decreased more than a value Ev-VD1 (forward voltage of the diode 7), a TR 9 is conductive and the electric charge in the capacitor 8 is discharged through the emitter, collector of the TR 9 and a resistor 10. In this case, a pulse is obtained at an output terminal 11.

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