KR20020061855A - Bi-potential mask type cathode ray tube - Google Patents

Abstract

PURPOSE: A bi-potential mask type cathode ray tube is provided to stabilize driving characteristic of the cathode ray tube and minimize badness due to movement and rotation of an element. CONSTITUTION: A bi-potential mask type cathode ray tube comprises a stud pin(22) and a screen voltage applying element(30). The stud pin(22) is stuck into a skirt and has a lower part(22a) into which the screen voltage applying element(30) is inserted and an upper part(22b) into which a coupling spring(20) is inserted. The screen voltage applying element(30) has a coupling groove(34a) corresponding to the lower part(22a), and many metal pins(36) for contacting a conductive film and a phosphor film screen. When the screen voltage applying element(30) is inserted into the stud pin lower part(22a), the conductive film is electrically connected to the phosphor film screen. The stud pin(22) and the screen voltage applying element(30) are combined with at least one plane contact so as to avoid movement and rotation of the screen voltage applying element(30).

Description

Bi-potential mask type cathode ray tube}

The present invention relates to a bi-potential mask type (hereinafter referred to as a "BIP type") cathode ray tube for supplying a differential potential to a fluorescent screen and a shadow mask, and more particularly, to a screen voltage applying member. The present invention relates to a BIP-type cathode ray tube capable of preventing flow and more stably supplying screen voltage.

In general, a cathode ray tube is a display device that emits a fluorescent screen by using an electron beam emitted from an electron gun, and implements a predetermined screen. The known configuration is as shown in FIG. 8, and is applied to a screen signal in the illustrated electron gun 1. When the corresponding three-strip electron beam 3 is emitted, the electron beam 3 is deflected by the magnetic field in which the deflection yoke 5 is generated to form a raster on the fluorescent film screen 7, thereby forming a shadow mask, which is a color-selective electrode. By (9) it is separated into the corresponding R, G, B fluorescent film to realize the correct color.

Here, the cathode ray tube of the general configuration uses the high voltage supplied to the anode button 11 through the built-in graphite film 15 on the inner surface of the funnel 13 and the final acceleration electrode (G4 electrode or anode) of the electron gun 1 and the shadow mask ( 9) and a fluorescent film screen 7. As a result, the electron beam focused at the G1 to G3 electrodes of the electron gun 1 is finally accelerated to control to reach the fluorescent film screen 7.

On the other hand, the BIP type cathode ray tube insulates the fluorescent screen 7 and the shadow mask 9 in the above-described structure, and applies a voltage higher than the shadow mask 9 to the fluorescent screen 7 to accelerate between these members. It consists of a structure that forms an electric field. As a result, the beam passing apertures 9a of the shadow mask 9 serve as an electron lens to focus the electron beam passing therethrough.

Therefore, the BIP-type cathode ray tube has the advantage of effectively improving the brightness of the screen by focusing the electron beam compared to the general cathode ray tube and lowering the internal voltage of the funnel 13 facing the deflection yoke 5 to reduce the deflection power.

However, the BIP-type cathode ray tube must secure an insulating structure between the fluorescent film screen 7 and the shadow mask 9 and stably supply the screen voltage and the mask voltage to the members, respectively. Supplying a differential potential presents significant technical difficulties.

In particular, in order to transfer the screen voltage supplied to the separate anode button to the fluorescent screen 7 without energizing the mask voltage, the anode button and the fluorescent screen are maintained while being insulated from the stud pin 17 to which the mask voltage is applied. It is essential to secure a specific structure that connects (7), that is, constitutes an application path of the screen voltage.

To this end, screen voltage applying members of various configurations have been devised to provide a corresponding voltage to a fluorescent screen by having a plurality of metal pins mounted in an insulated state on a stud pin, but most of the members are circular coupling holes corresponding to stud pin shapes. Formed to form a structure that is fitted to the stud pin.

As the circular coupling hole is formed corresponding to the circular stud pins as described above, the screen voltage applying member is easily rotated about the stud pins due to the impact on the cathode ray tube or the assembly with other components. May cause flow.

Rotation and flow of the screen voltage applying member cause a poor supply of the screen voltage, such as causing a poor contact with the fluorescent film screen or damaging the fluorescent film screen by scratching, thereby causing a poor driving of the BIP type cathode ray tube. Will act as.

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to stabilize the driving characteristics of the cathode ray tube by supplying the screen voltage to the fluorescent film screen more stably by preventing the flow and rotational movement of the screen voltage applying member. In addition, to provide a BIP-type cathode ray tube that can minimize the occurrence of defects due to the flow and rotational movement of the member.

1 is a cross-sectional view of a bi-potential mask type cathode ray tube according to the present invention.

2 is a front view of the face panel viewed in the direction of the electron gun;

3 is an exploded perspective view of the stud pin and the screen voltage applying member and the coupling spring.

4 is a side view in the engaged state.

5 to 7 are exploded perspective views of the stud pin and the screen voltage applying member according to another embodiment of the present invention.

8 is a cross-sectional view of a typical cathode ray tube.

In order to achieve the above object, the present invention,

Fluorescent film screens and shadow masks that are supplied with differential potentials while being insulated from each other, a plurality of stud pins fixed to the inner surface of the skirt portion of the face panel, and coupling holes corresponding to the stud pin shape are formed and inserted into the stud pins. It comprises a screen voltage applying member for supplying a screen voltage to the fluorescent film screen having a plurality of metal pins extending in the direction of the tube,

Provided is a bi-potential mask type cathode ray tube in which the stud pin and the screen voltage applying member fitted to the stud pin are coupled by at least one surface in a flat surface contact.

That is, the coupling hole of the stud pin and the screen voltage applying member may be formed in a polygonal shape including a triangular, square, and pentagonal shape as a non-circular shape, or may be formed in a semicircle or semi-elliptic shape.

As a result, the present invention has the advantage of preventing the flow and rotational movement of the screen voltage applying member to the stud pin to supply the screen voltage more stably, and to minimize the occurrence of defects due to the flow and rotational movement of the member.

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

1 is a cross-sectional view of a BIP type cathode ray tube according to the present embodiment, and FIG. 2 is a front view of the face panel viewed from the electron gun direction.

As shown, the BIP type cathode ray tube basically combines the face panel 2, the funnel 4, and the neck portion 6 to form a vacuum bulb 8, and the screen portion 2a of the face panel 2 is formed. The inner surface of the fluorescent film screen 10 is arranged in a plurality of R, G, B fluorescent film, the outer surface of the funnel (4) and the inner surface of the neck portion 6, the deflection yoke 12 and the electron gun (14) It consists of an integrally mounted configuration.

The shadow mask 16, which forms a plurality of beam passing apertures 16a, is supported by the mask frame 18, and a plurality of coupling springs 20 fixed to the outside of the mask frame 18 are provided on the face panel 2. Removably coupled to the stud pin 22 provided on the inner surface of the skirt (2b). As a result, the shadow mask 16 is fixedly installed in the face panel 2 while facing the fluorescent screen 10.

Here, the present embodiment provides a skirt portion 2b from which the conductive material is removed on the inner surface to keep the fluorescent screen 10 and the shadow mask 16 in an insulated state, and separates the screen voltage and the mask voltage from each other. It is applied to the fluorescent screen 10 and the shadow mask 16 through the application path.

To this end, for example, when the screen voltage and the mask voltage are supplied through a separate voltage source from the bulb 8, two anode buttons 24a and 24b are installed in the funnel 4, and each anode button 24 is provided. ) May provide a separate voltage application path for applying the voltage supplied to the fluorescent film screen 10 and the shadow mask 16.

As an example, the conductive film 26 is formed from the first anode button 24a to which the screen voltage is supplied, to the frit coating portion where the face panel 2 is fused as shown in the figure, and the conductive film 26 and The internal graphite film 28 may be formed on the inner surface of the funnel 4 in an insulated state to receive a mask voltage through the second anode button 24b.

As a result, a contact voltage (30) is formed on at least one stud pin (22) connecting the conductive film (26) and the fluorescent film screen (10) to the contact spring (28). 32 is provided in the mask frame 18, the screen voltage and the mask voltage can be transmitted to the fluorescent screen 10 and the shadow mask 16 through these members.

At this time, the present embodiment provides a screen voltage applying member and a stud pin having a new structure that can prevent the flow and rotational movement of the screen voltage applying member 30 mounted on the stud pin 22, FIG. 4 is an exploded perspective view of the stud pin and the screen voltage applying member according to the present embodiment, and FIG.

First, the stud pin 22 will be described. The stud pin 22 is embedded in the skirt portion 2b when the face panel is manufactured and fixed to the bottom portion 22a to which the screen voltage applying member 30 is fitted. The lower end portion 22a is formed to protrude to a smaller diameter and consists of a circular upper end portion 22b into which the coupling spring 20 is fitted.

In addition, the screen voltage applying member 30 is fixed to both ends of the body portion 34 and the body portion 34 formed with a coupling hole 34a corresponding to the shape of the lower end portion 22a of the stud pin, and the tube axis direction (Z in the figure). Axially extending) so that both ends are composed of a plurality of metal pins 36 each of which contacts the conductive film 26 on the inner surface of the funnel 4 and the aluminum deposited film of the fluorescent film screen 10.

The body 34 is made of an insulating material having excellent heat resistance to sufficiently withstand the high temperature in the cathode ray tube manufacturing process while maintaining insulation with the stud pin 22 to which the mask voltage is supplied, and both ends of the metal pins 36. In order to protect the silver conductive film 26 and the fluorescent film screen 10, it is preferable to form concave toward the inside of the cathode ray tube.

Thus, in the cathode ray tube assembly process, the operator inserts the screen voltage applying member 30 into the stud pin lower end 22a to electrically connect the conductive film 26 and the fluorescent film screen 10, and the stud pin upper end 22b. The coupling spring 20 is inserted into the mask frame 18 to fix the inside of the face panel 2.

Here, in the present embodiment, the screen voltage applying member 30 coupled to the stud pin 22 is coupled to the stud pin 22 so that the screen voltage applying member 30 does not cause relative rotational movement and flow around the stud pin 22. At least one surface is to be bonded by a flat surface contact.

In other words, the lower end portion 22a of the stud pin and the coupling hole 34a of the screen voltage applying member 30 corresponding thereto are non-circular, and as a specific example, the lower end 22a of the stud pin and the screen voltage applying member ( The coupling hole 34a of 30 has a square shape as shown.

Thus, in the state where the screen voltage applying member 30 is fitted to the stud pin 22, even if a force is applied to any part of the screen voltage applying member 30, the shape rotates or flows around the stud pin 22. Since it can be prevented from occurring, the screen voltage applying member 30 can accurately maintain the mounting position in the state fixed to the stud pin 22.

Therefore, even when a force is applied to the screen voltage applying member 30 or an external impact is applied to the cathode ray tube during assembly with other components, the screen voltage applying member 30 maintains the mounting position as it is, the metal pin The end of the 36 allows the conductive film 26 and the fluorescent film screen 10 to be continuously connected so that the screen voltage can be stably supplied at all times.

As such, the lower end portion 22a of the stud pin and the coupling hole 34a of the screen voltage applying member 30 corresponding thereto are formed in a non-circular shape so that the mounting position of the screen voltage applying member 30 can be maintained firmly. The coupling hole 34a of the lower end portion 22a of the stud pin and the screen voltage applying member 30 may have a polygonal shape including a pentagonal shape or other triangular shape as shown in FIG. .

6, the coupling hole 34a of the stud pin lower end 22a and the screen voltage applying member 30 may be formed in a semi-circular shape, and as another embodiment, a circular or the like, such as a semi-elliptic type shown in FIG. 7. A part of the oval may be formed in a cut shape.

In addition to the above-mentioned shape, the coupling hole 34a of the stud pin lower end 22a and the screen voltage applying member 30 may be formed in any shape that can prevent rotational movement and flow of the screen voltage applying member 30. Do.

Therefore, the present embodiment maintains the mounting position of the screen voltage applying member 30 within the cathode ray tube so that the metal pins 36 stably connect the conductive film 26 and the fluorescent screen 10 at all times. The screen voltage supplied to the first anode button 24a can be more stably supplied.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As such, the present invention can effectively prevent rotational movement and flow of the screen voltage applying member by forming the coupling hole of the screen voltage applying member and the lower end of the stud pin corresponding thereto in a non-circular shape. As a result, the driving voltage of the cathode ray tube is stabilized by supplying the screen voltage more stably, and it is possible to minimize the occurrence of defect of the cathode ray tube by preventing contact failure or membrane damage of the metal pin due to rotation or flow of the screen voltage applying member. Has an advantage.

Claims (8)

Fluorescent film screens and shadow masks that are supplied with differential potentials while being insulated from each other, a plurality of stud pins fixed to the inner surface of the skirt portion of the face panel, and coupling holes corresponding to the stud pin shape are formed and inserted into the stud pins. It comprises a screen voltage applying member for supplying a screen voltage to the fluorescent film screen having a plurality of metal pins extending in the direction of the tube, A bi-potential mask type cathode ray tube, in which the stud pin and the screen voltage applying member fitted to the stud pin are coupled to each other by at least one surface in a flat surface contact. The method of claim 1, The screen voltage applying member is made of an insulating material, and has a body portion that forms a non-circular coupling hole in the center, and a plurality of metal pins fixed to both ends of the body portion and extending in the axial direction to apply the screen voltage to the fluorescent screen. Bi-potential mask type cathode ray tube which consists of. The method of claim 1, The stud pin is a bi-potential mask type cathode ray tube consisting of a circular upper end portion to which the coupling spring is fixed, and a non-circular lower end portion to which the screen voltage applying member is fixed. The method of claim 2 or 3, And a coupling hole between the lower end of the stud pin and the screen voltage applying member, the bi-potential mask type cathode ray tube having a polygonal shape including square and pentagonal shapes. The method of claim 2 or 3, Bi-potential mask type cathode ray tube of which the coupling hole between the lower end of the stud pin and the screen voltage applying member is formed by cutting a part of a circular shape including a semicircle shape. The method of claim 2 or 3, Bi-potential mask type cathode ray tube of which the coupling hole between the lower end of the stud pin and the screen voltage applying member is formed by cutting a portion of an oval including a semi-elliptic shape. The method of claim 1, A separate anode button for supplying the screen voltage is installed in the funnel, and a conductive film is formed from the anode button to the frit coating portion where the face panel is fused so that the metal pins of the screen voltage applying member contact the conductive film and the fluorescent screen, respectively. Bi-potential mask type cathode ray tube to supply screen voltage. The method of claim 1, A bi-potential mask type cathode ray tube having a contact spring provided in a mask frame for supporting a shadow mask, wherein one end of the contact spring is brought into contact with a built-in graphite film on the inner surface of the funnel to supply a mask voltage.