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US 6,989,639 B2Granted
Television image receiving apparatus and CRT display apparatus
AssigneeFunai Electric Co., Ltd.
InventorKoji Kamizawa
Life of this patent
Estimating the term…
Abstract
In a configuration equipped with an anode current detecting resistor connected between a ground side terminal of secondary coils wound around a flyback transformer and generating a high voltage for an anode of a CRT, it is equipped with declination detecting device which detects declination of a voltage of the ground side terminal, and control device which stops an operation of a horizontal output transistor, after a state is shifted from a power OFF state to a power ON state, when the declination detecting device 5 does not detect declination of a voltage of the ground side terminal in case that a predetermined period has passed.
Claims5
A television image receiving apparatus comprising:
- a main body of the television image receiving apparatus including a front panel;
- a display part disposed on the front panel of the main body, and on which information such as ON and OFF of power is displayed;
- a flyback transformer;
- a secondary coil generating a high voltage for an anode of a CRT and wound around the flyback transformer, and the secondary coil having a ground side terminal;
- an anode current detecting resistor connected between the ground side terminal of the secondary coil and a power route with a predetermined voltage;
- a declination detecting means detecting declination of a voltage of the ground side terminal;
- and
- a control means stopping an operation of a horizontal output transistor and warning display for showing an abnormality of a connection of a route of the high voltage by using the display part, when the declination detecting means does not detect the declination of the voltage of the ground side terminal, even when time, at which it is assumed that a tube surface of the CRT is brighten up, has passed, after a state is shifted from a power OFF state to a power ON state, wherein
- the declination detecting means includes a capacitor, one terminal of which is connected to the ground side terminal, and a pull-up resistor connected between the other terminal of the capacitor and a logic circuit positive power source, and
- a detection result is outputted from the other terminal of the capacitor.
7 more elements
A CRT display apparatus comprising:
- a flyback transformer;
- a secondary coil generating a high voltage for an anode of a CRT and wound around the flyback transformer, and the secondary coil having a ground side terminal;
- an anode current detecting resistor connected between the ground side terminal of the secondary coil and a power route with a predetermined voltage;
- declination detecting means detecting declination of a voltage of the ground side terminal;
- and
- control means stopping an operation of a horizontal output transistor when the declination detecting means does not detect the declination of the voltage of the ground side terminal, even when a predetermined time has passed, after a state is shifted from a power OFF state to a power ON state.
3 more elements
A television image receiving apparatus comprising:
- a main body of the television image receiving apparatus including a front panel;
- a display part disposed on the front panel of the main body, and on which information such as ON and OFF of power is displayed;
- a flyback transformer;
- a secondary coil generating a high voltage for an anode of a CRT and wound around the flyback transformer, and the secondary coil having a ground side terminal;
- an anode current detecting resistor connected between the ground side terminal of the secondary coil and a power route with a predetermined voltage;
- a declination detecting device detecting declination of a voltage of the ground side terminal;
- and
- a control device stopping an operation of a horizontal output transistor and warning display for showing an abnormality of a connection of a route of the high voltage by using the display part, when the declination detecting device does not detect the declination of the voltage of the ground side terminal, even when time, at which it is assumed that a tube surface of the CRT is brighten up, has passed, after a state is shifted from a power OFF state to a power ON state, wherein
- the declination detecting device includes a capacitor, one terminal of which is connected to the ground side terminal, and a pull-up resistor connected between the other terminal of the capacitor and a logic circuit positive power source, and
- a detection result is outputted from the other terminal of the capacitor.
7 more elements
Dependencies are inferred from the claim text.