KR950010638Y1 - Electron gun aging tester - Google Patents

Abstract

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Description

CRT Aging Tester

1 is a circuit diagram of one embodiment of the CRT aging test apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

H: Heater S1: Heater Switch

S2: Catswood Switch S3: Control Switch

S4: Screen switch T: Timer

This article relates to a CRT tester, and more particularly to a CRT tester for testing the aging of electron guns in a CRT and the repair between grids.

After the electron gun is enclosed in the neck glass, the electron gun is put into an aging process to facilitate the release of hot electrons from the cathode electrode and to analyze the cathode characteristics.

After the aging process, a separate process such as repair to remove stray emission due to foreign matter between grids is required.

It is an object of the present invention to provide a device capable of aging a tube, in particular a color tube, and at the same time removing foreign matter between grid electrodes for repairing a stray emission of abnormal light emission.

This paper is characterized by the provision of a circuit and a timer to automatically perform this CRT test between the cathode and each grid electrode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The figure is a circuit diagram showing the connection state of the CRT test apparatus in this paper.

Heater switch S1 for shorting the heater voltage Ef applied to the heater H, the control switch voltage applied to the cathode switch S2 for shorting the connection of the cathode K, and the G1 grid electrode G1 ( Control switch S3 for shorting Ec1, screen voltage applied to G2 grid electrode G2, screen switch S4 for shorting, and focus voltage Ec3 applied to G3 grid electrode G3 Each having a focus switch S5.

Each switch is connected to the ground line in the case of unconnected power, and the resistance switch R for the cathode protection and the ammeter M for the measurement of the cathode current are connected in series to the cathode switch S2.

The heater switch S1, the cathode switch S2, the control switch S3, the screen switch S4, and the focus switch S5 are interlocked and short-circuited, respectively. That is, the heater switch (S1)-the cathode switch (S2), the heater switch (S1)-control switch (S3), the heater switch (S1)-screen switch (S4), the heater switch (S1)-focus switch (S5) At the same time, the wiring and power-on state are turned on and off.

The heater voltage Ef is applied higher than the normal heater voltage to perform the heating activation action to remove residual gas after exhausting, and the control voltage Ec1 removes contamination or gas on the electrode surface by electron impact action.

Screen voltage (Ec2) activates the grid electrode as a clean action of current and promotes adsorption to getter film by ionizing gas, and focus voltage (Ec3) is a voltage to remove foreign matters by performing clean action of electrode itself. Will be authorized.

The heater switch (S1) and each switch is turned on / off in turn with a predetermined time interval, this operation is performed by a timer (T). That is, the timer T turns on the heater switch S1 and the switches S2, S3, S4, and S5 in turn at a predetermined time interval so as to be connected or shorted after a voltage is applied.

Although the above-described CRT test apparatus of one color has been described with respect to the electron gun of one color, the assembly of the electron gun for three electron beams of red, blue, and green is provided with a switch which sequentially or automatically switches them, respectively. Of course you can.

The above-described CRT test apparatus sequentially short-circuits each switch to apply a voltage between the heater and each grid electrode so that the aging process is automatically performed and removes foreign substances and improves the vacuum in the tube by the action of the above-described voltages. Has an effect.

Claims (1)

Heater switch S1 for shorting the heater voltage Ef, Cathode switch S2 for shorting the connection between the protection resistor R and the cathode K which is connected in series with the ammeter M, and the control voltage Ec1. Has a control switch S3 for shorting (), a screen switch S4 for controlling the screen voltage Ec2, a focus switch S5 for controlling the focus voltage Ec3, and the heater switch S1 and a cathode switch. (S2), the control switch (S3), the heater switch (S1) and the screen switch (S4), the heater switch (S1) and the focus switch (S5) are sequentially turned on / off by the timer (T) to supply power Braun tube aging (Aging) test apparatus, characterized in that.