KR20020019337A - Bi-potential mask type cathode ray tube - Google Patents

Abstract

PURPOSE: A bi-potential mask type cathode ray tube is provided to maintain an insulation of a phosphor film screen and a shadow mask, while supplying a bi-potential stably to the phosphor film screen. CONSTITUTION: A phosphor film screen(10) forms a plurality of R, G, B phosphor films and emits light with electron beams. A shadow mask(16) is arranged to face to the phosphor film screen so as to separate the electron beams from the corresponding phosphor film, and is supplied with a specific potential. A plurality of stud pins(22) is fixed to the inside of a skirt part in face panel. A mask frame(18) is fixed to the stud pins(22) by a hook spring and supports the shadow mask to the inside of the face panel(2). A supplying unit keeps in insulation with the stud pins and supplies a specific potential to the phosphor film screen by connecting electrically the phosphor film screen to the built-in graphite film(26) of the funnel(4).

Description

Bi-potential mask type cathode ray tube}

The present invention relates to a bi-pontential mask type (hereinafter referred to as 'BIP type') cathode ray tube for supplying a differential potential to a fluorescent screen and a shadow mask. More specifically, the present invention relates to a fluorescent screen and a shadow screen. The present invention relates to a BIP type cathode ray tube capable of stably supplying a differential potential to the fluorescent screen while maintaining a mask in an insulated state.

In general, a cathode ray tube is a display device that emits a fluorescent screen with an electron beam emitted from an electron gun, and implements a predetermined screen. The known configuration is as shown in FIG. 12, and is mounted on an inner circumferential surface of the neck part 1. When the three electron beams 5 are emitted from the electron gun 3, the electron beams 5 are deflected by the magnetic field in which the deflection yoke 7 is generated to form a raster on the fluorescent film screen 9 while forming a raster. The shadow mask 11, which is a selection electrode, is separated into a corresponding R, G, and B fluorescent film to express an accurate color.

The cathode ray tube of the general configuration is the final acceleration electrode of the fluorescent film screen 9, the shadow mask 11 and the electron gun 3 through the internal graphite film 17 coated on the inner surface of the anode button 13 and the funnel 15 A high voltage of approximately 20 to 32 kV is applied to the (G4 electrode or anode) 19 to finally accelerate the electron beam focused on the G1 to G3 electrode 21 of the electron gun 3 to reach the fluorescent film screen 9. To control.

On the other hand, the BIP type cathode ray tube insulates the fluorescent screen 9 from the shadow mask 11 and applies a voltage higher than the shadow mask 11 to the fluorescent screen 9 to form an accelerated electric field between these members. As a result, the beam passing apertures 11a formed in the shadow mask 11 become electron lenses to focus and deflect the electron beam 5 passing therethrough. Therefore, the BIP type cathode ray tube can realize more improved screen brightness than the general cathode ray tube.

However, the BIP type cathode ray tube must secure the insulating structure of the fluorescent film screen 9 and the shadow mask 11 and stably supply the differential potential to the members, but in practice, there is a considerable technical difficulty in realizing it. Follow. In particular, in order to supply the differential potentials to the members, for example, a method of supplying the differential potentials to the members directly from the outside with respective anode buttons on the face panel 23 and the funnel 15 may be applied. However, the above method has a disadvantage in that the external structure of the bulb 25 is complicated, and it is difficult to install the anode button on the face panel 23, so that practical implementation is difficult.

In addition, a method of supplying a differential potential to the fluorescent screen 9 and the shadow mask 1 through the embedded graphite film 17 applied to the inner surface of the funnel 15 may be applied, but the fluorescent screen 9 In order to stably supply the differential potential to the fluorescent film screen 9 while maintaining the shadow mask 11 in an insulated state, it is necessary to secure a specific structure for realizing this.

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to provide a BIP type cathode ray tube which can stably supply the differential potential to the fluorescent screen, while maintaining the fluorescent screen and the shadow mask in an insulated state. To provide.

Another object of the present invention is to electrically connect the embedded graphite film and the fluorescent screen applied on the inner surface of the funnel while maintaining the fluorescent screen and the shadow mask in an insulated state, thereby stably setting the differential potential to the fluorescent screen through the embedded graphite film. It is to provide a BIP-type cathode ray tube that can be supplied by.

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

Fig. 2 is a front view showing the face panel in the electron gun direction.

3 to 4 are exploded perspective and coupling side views of the insulating member and the conductive member, respectively.

5A and 5B are enlarged views of the stud pin-mask frame coupling portion when and without the insulating member and the conductive member, respectively;

6 is a partially enlarged view of FIG. 1;

7 to 11 are schematic views showing other embodiments of the insulating member and the conductive member.

12 is a cross-sectional view of a cathode ray tube according to the prior art.

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

A fluorescent film screen which forms a plurality of R, G, and B fluorescent films on the inner surface of the face panel to receive electron beams and emits light;

A shadow mask disposed opposite to the fluorescent film screen to separate the electron beam into the corresponding fluorescent film, the shadow mask being supplied with a specific potential while being insulated from the fluorescent film screen;

A large number of stud pins fixed to the skirt inner surface of the face panel,

A mask frame fixed to the stud pin by a hook spring to fix and support the shadow mask inside the face panel;

Bi-potential mask type cathodes provided on at least one stud pin and comprising means for electrically connecting the fluorescent screen and the embedded graphite film on the inner surface of the funnel while supplying a specific potential to the fluorescent screen while maintaining insulation with the stud pin. Provide a coffin.

The means may include a ring-shaped insulating member fixed to an outer circumferential surface of the stud pin and a plurality of contact protrusions fixed to the outer circumferential surface of the insulating member and extending in the axial direction, respectively, to contact the fluorescent film screen and the embedded graphite film, respectively. It is composed.

Thus, the present invention insulates the conductive member and the stud pin by the insulating member to prevent energization of the fluorescent screen and the shadow mask, while electrically connecting the fluorescent screen and the built-in graphite film through the conductive member to provide a specific potential to the fluorescent screen. It has the advantage of being able to supply stably.

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 has a face panel 2, a funnel 4, and a neck. The unit 6 is integrally coupled to form a vacuum bulb 8, and a fluorescent screen 10 in which a plurality of R, G, and B fluorescent films are arranged on the inner surface of the screen unit 2a of the face panel 2 is provided. The deflection yoke 12 and the electron gun 14 are integrally mounted to the outer circumferential surface of the funnel 4 and the inner circumferential surface of the neck portion 6, respectively.

In addition, a shadow mask 16 having a plurality of beam passing apertures 16a formed thereon is supported by the mask frame 18, and a plurality of hook springs 20 fixed to the outside of the mask frame 18 are provided with face panels 2. Removably coupled to the stud pin 22 fixed to the inner surface of the skirt (2b) of the), it is fixed to the inside of the face panel (2) so that the shadow mask 16 to face the fluorescent screen (10).

Here, the fluorescent film screen 10 and the shadow mask 16 are insulated from each other, and the shadow mask 16 is applied with the same voltage as the final acceleration electrode 24 and the embedded graphite film 26 of the electron gun 14. Then, a higher voltage than the shadow mask 16 is applied to the fluorescent screen 10. Therefore, an accelerated electric field is formed between the shadow mask 16 and the fluorescent screen 10 to focus the electron beam passing through the aperture 16a for beam passing, thereby realizing a high brightness characteristic.

As described above, since the BIP type cathode ray tube insulates the fluorescent film screen 10 and the shadow mask 16 due to the driving characteristics, it is important to stably supply the differential potential to these members. ) Is insulated from the shadow mask 16 while providing a means for stably supplying a specific potential to the fluorescent film screen 10, particularly through a separate embedded graphite film 26a.

Means provided by the present embodiment is provided to the at least one stud pin 22 of the plurality of stud pins 22 (mainly provided with four) in an insulated state while the fluorescent film screen 10 and the built-in graphite film 26a Electrically connected to supply a specific potential to the fluorescent film screen 10, as shown in Figures 3 and 4, the means is a ring-shaped insulating member 28 is fixed to the outer peripheral surface of the stud pin 22 And a conductive member 30 fixed to the outer circumferential surface of the insulating member 28 and having a plurality of contact protrusions 32 extending in the tube axis (z-axis in the figure) direction.

The insulating member 28 has an internal space corresponding to the shape of the stud pin 22 and is fixed in a state of being fitted to the outer circumferential surface of the stud pin 22. For example, the insulating member 28 is made of an insulating material such as ceramic to insulate the stud pin 22. The state is maintained, and a thread is formed on the outer circumferential surface such that the conductive member 30 is coupled to the outer circumferential surface of the insulating member 28.

In addition, the conductive member 30 forms a circular coupling hole 34a to be fitted to the outer peripheral surface of the insulating member 28 toward the center of the fixing part 34 to form an outer peripheral surface of the insulating member 28 through a screw thread formed in the insulating member 28. And a plurality of contact protrusions 32 extending in a direction parallel to the tube axis so as to be fixedly coupled to the fluorescent film screen 10 and the embedded graphite film 26a so as to be in contact with each other.

In this case, when the contact protrusion 32 is mounted inside the cathode ray tube, the contact protrusion 32 directly contacts the fluorescent film screen 10 formed on the inner surface of the face panel 2 and the embedded graphite film 26a applied to the inner surface of the funnel 4. In order to prevent damage to the film at the contact portion, it is preferable to have a round shape and to make line contact or surface contact with the fluorescent film screen 10 and the embedded graphite film 26a.

The insulating member 28 and the conductive member 30 having such a configuration are mounted on the stud pins 22 to electrically connect the fluorescent film screen 10 and the embedded graphite film 26a without generating electricity to the shadow mask 16. 5A is an enlarged view of a stud pin-mask frame coupling portion according to a general configuration, and FIG. 5B is an enlarged view of a stud pin-mask frame coupling portion on which the insulating member and the conductive member are mounted. ) And the mounting process and action of the conductive member 30 will be described in more detail.

Looking at the coupling structure of the mask frame 18 and the stud pins 22 by the hook spring 20, the hook spring 20 has a hole formed at one end of the hook spring 20 and fixed to the outer surface of the mask frame 18. While fitted to the stud pin 22, the mask frame 18 is fixed to the inner surface of the skirt portion 2b of the face panel 2 at regular intervals as shown in FIG.

Here, the insulating member 28 and the conductive member 30 are pre-installed on at least one stud pin 22 before the hook spring 20 fixed to the mask frame 18 is coupled with the stud pin 22. First, the conductive member 30 is fixed to the outer circumferential surface of the insulating member 28, the insulating member 28 is fixed to the outer circumferential surface of the stud pin 22, and then the hook spring 20 is coupled to the stud pin 22. If so, the installation of these insulating members 28 and the conductive member 30 is completed.

At this time, the conductive member 30 acts as a leaf spring so that the contact protrusion 32 presses the inner surface of the face panel 2 and the funnel 4 with a predetermined elastic force. To this end, the conductive member 30 is formed such that the contact protrusion 32 is bent to have a predetermined height difference at the fixed portion 34, and the face panel 2 at one end of the hook spring 20 facing the stud pin 22. The distance d1 to the inner surface of the skirt portion 2b is set to be smaller than the overall height d2 of the combination of the insulating member 28 and the conductive member 30 shown in FIG.

As a result, when the conductive member 30 is mounted on the cathode ray tube, the contact member 32 is compressed by the difference between d2 and d1 to cause elastic deformation, so that the contact protrusions 32 face the inner surfaces of the face panel 2 and the funnel 4. Pressurization by elastic force makes it firmly contact with the fluorescent film screen 10 and the embedded graphite film 26a.

Accordingly, the conductive member 30 electrically connects the embedded graphite film 26a and the fluorescent screen 10 by the contact protrusion 32 to transfer the high voltage provided to the embedded graphite film 26a to the fluorescent screen 10. In addition, it is insulated from the stud pin 22 by the insulating member 28 to stably supply a specific potential to the fluorescent screen 10 without the energization of the shadow mask 16.

On the other hand, the application of voltage to the shadow mask 16 can be realized by a conventional contact spring 36, which forms a built-in graphite film 26 of various paths on the inner surface of the funnel 4, as shown in FIG. As described above, when the contact spring 36 is connected between the mask frame 18 and the embedded graphite film 26, the contact spring 36 is applied to the embedded graphite film 26 through the conductive contact spring 36 and the mask frame 18. The high voltage may be transferred to the shadow mask 16.

7 to 10 are exploded perspective views showing various other embodiments of the insulating member and the conductive member. First, the embodiment shown in FIG. 7 shows one end of the insulating member 28 to which the conductive member 30 is inserted. Assuming the upper end 28a, the outer diameter of the upper end 28a is reduced and provided with a pair of fixing protrusions 38, and the fixing part 34 of the conductive member 30 is provided with an insulating member 28. A coupling hole 34a having a corresponding shape is formed so that the conductive member 30 is firmly fixed by a pair of fixing protrusions 38 at the upper and lower end portions 28a and 28b of the insulating member 28.

8 shows the rectangular shape of the lower end 28b of the insulating member 28 in the configuration of FIG. 7 and extends the conductive member 30 in the direction toward the embedded graphite film 26a. Three contact protrusions 32 are formed at one end of the fixing part 34 to form six contact protrusions 32.

In the embodiment shown in FIG. 9, the upper and lower ends 28a and 28b of the insulating member 28 and the coupling holes 34a of the conductive member 30 are formed in a square shape in the configuration of FIG. 8. 34 is configured to further increase the number of the contact protrusions 32 formed, the embodiment shown in FIG. 10 is a screw thread instead of the fixing projections on the outer peripheral surface of the upper end 28a of the insulating member 28 in the configuration of FIG. It is made of a configuration formed.

As described above, the insulating member 28 and the conductive member 30 provided in various embodiments may be more easily mounted on the cathode ray tube when the stud pin 22 is made higher to secure their installation space. .

In addition, as shown in FIG. 11, the means provided in this embodiment may include a packing insulating member 40 on the inner circumferential surface of the coupling hole of the conductive member 30 instead of the insulating member, and the packing insulating member 40 may include a stud. While insulating the pin 22 and the conductive member 30 serves to fix the conductive member 30 to the stud pin 22, the conductive member 30 has a plate spring action to support the stud pin 22 as a support. do.

Thus, the conductive member 30 is directly mounted on the outer circumferential surface of the stud pin 22 while maintaining the insulating state with the stud pin 22 by the packing insulating member 40, and the built-in graphite film 26a and the fluorescent film screen 10 May be electrically connected to each other to stably supply a specific potential to the fluorescent screen 10.

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 described above, the present invention includes an insulating member and a conductive member in at least one stud pin to stably supply a specific potential to the fluorescent screen without the energization of the shadow mask. That is, the contact protrusion of the conductive member contacts the internal graphite film and the fluorescent screen, respectively, and electrically connects them, so that the high voltage supplied to the internal graphite film can be supplied to the fluorescent screen, and the insulating member provides a conductive member and a stud pin. Insulation can effectively prevent the driving failure of the BIP type cathode ray tube caused by energization with the shadow mask.

Claims (11)

A fluorescent screen for forming a plurality of R, G, and B fluorescent films on the inner surface of the screen panel to receive and emit electron beams; A shadow mask disposed opposite to the fluorescent film screen to separate the electron beam into the corresponding fluorescent film, the shadow mask being supplied with a specific potential while being insulated from the fluorescent film screen; A plurality of stud pins fixed to the inner surface of the skirt portion of the face panel; A mask frame fixed to the stud pin by a hook spring to fix and support a shadow mask inside the face panel; Bi-potential mask type cathodes provided on at least one stud pin and comprising means for electrically connecting the fluorescent screen and the embedded graphite film on the inner surface of the funnel while supplying a specific potential to the fluorescent screen while maintaining insulation with the stud pin. tube. The method of claim 1 wherein said means is An annular insulating member fixed to an outer circumferential surface of the stud pin; A bi-potential mask type cathode ray tube comprising a conductive member fixed to an outer circumferential surface of the insulating member and having a plurality of contact protrusions extending in the tube axis direction, the conductive member being in contact with the fluorescent film screen and the embedded graphite film, respectively. The method of claim 2, A bi-potential mask type cathode ray tube, wherein the insulating member forms a thread on a portion of an outer circumferential surface of the insulating member for coupling with the conductive member. The method of claim 2, Bi-potential mask type cathode ray tube of the insulating member is formed to reduce the outer diameter of the upper end facing the conductive member compared to the lower end for coupling with the conductive member, and to form at least one fixing projection on the outer peripheral surface of the upper end. The method of claim 4, wherein A bi-potential mask type cathode ray tube having an upper end and a lower end of the insulating member having a circular shape. The method of claim 4, wherein A bi-potential mask type cathode ray tube of which the upper and lower ends of the insulating member have circular and rectangular shapes, respectively. The method of claim 4, wherein A bi-potential mask type cathode ray tube having an upper end and a lower end of the insulating member having a rectangular shape. The method of claim 2, The conductive member has a coupling hole corresponding to the shape of the insulating member outer circumferential surface and a fixing portion fixed to the insulating member outer circumferential surface, and bent to have a predetermined height difference with the fixing portion, extending in the tube axis direction from both ends of the fixing portion. A bi-potential mask type cathode ray tube composed of a plurality of contact protrusions respectively contacting a screen and an embedded graphite film. The method of claim 8, Bi-potential mask type cathode ray tube of the conductive member to form a coupling hole of a circular or square shape corresponding to the outer peripheral surface shape of the upper end of the insulating member. The method of claim 8, The bi-potential that the overall height combined with the insulating member and the conductive member is set to be greater than the distance from one end of the hook spring facing the stud pin to the inner surface of the face panel skirt so that the conductive member is elastically deformed when mounted on the cathode ray tube. Masked cathode ray tube. The method of claim 1 wherein said means is A conductive member fixed to an outer circumferential surface of the stud pin through a coupling hole and electrically contacting the embedded graphite film and the fluorescent film screen, respectively; Bi-potential mask type cathode ray tube provided on the inner circumferential surface of the coupling hole of the conductive member is composed of a packing insulating member for insulating and fixing the conductive member to the stud pin.