KR950003511B1 - Spring supporting frame of crt - Google Patents

Abstract

The doming compensation characteristics and the productivity are improved by adopting the spring unit. The spring unit includes a coupler (31) having a hole (9) through which a stud pin (5) of a pannel is inserted, an elastic unit (32) projected from the coupler (31), a welding unit (33) supporting a frame, a low expansion unit (34), having the length (L1) of 0.4<=L1<=0.8L and the thickness of 0.4<=T1<=0.8T where L is the length of a high expansion unit (37) and T is the thickness of the high one.

Description

Spring for frame support of cathode ray tube

1 is a plan view showing a frame support spring of the cathode ray tube according to the present invention.

2 is a side view showing a frame support spring of the cathode ray tube according to the present invention.

3 is a view for explaining a method for manufacturing a frame support spring according to the present invention.

4 is a front view showing the assembly state of the panel portion of a typical cathode ray tube.

5 is a plan view showing a frame support spring of a conventional cathode ray tube.

* Explanation of symbols for main parts of the drawings

9: hole 31: coupling portion

32: elastic part 33: welding part

34: low expansion part 36: low expansion member

37: high expansion member

The present invention relates to a frame support spring of a cathode ray tube, and more particularly, to a frame support spring of an cathode ray tube improved to improve the doming compensation of a good shadow mask and to shorten the manufacturing process and improve productivity.

A typical shadow mask type cathode ray tube consists of at least a bulb consisting of a panel, a panel, and a neck, and an electron gun is applied to the neck, and an phosphor of RG B is applied to the inner surface of the panel, and is separated from the phosphor at a distance. The shadow mask is placed.

Here, the shadow mask allocates three electron beams emitted from the electron gun to each corresponding mold and body of RG B applied to the inner surface of the panel, and is coupled to the frame to form a shadow mask structure, which structure supports the frame. It is installed inside the panel by the spring.

The conventional known shadow mask structure will be described in more detail with reference to FIG. 4 as follows.

The shadow mask 1 through which the electron beam passes is formed in a substantially rectangular shape, and is mounted on a frame 2 for supporting the same, and three to four frame supporting springs 3 are attached to the side portions of the frame 2. By fitting the hole formed in the free end of the spring 3 into the stud pin 5 protruding inside the panel 4, the shadow mask structure is suspended in the panel.

Here, since the electron beam passing through the shadow mask 1 is only about 25% of the total amount, the electron beam is hit around the remaining electron beam to generate heat, which eventually causes thermal deformation of the shadow mask. It will work.

It is already known that the method of using bimetal as the frame support spring 3 is quite effective to overcome thermal deformation of the shadow mask. On the other hand, Japanese Patent Publication No. 49-9581 (March 5, 1974) describes a method using three or four bimetal springs to elastically suspend the shadow mask of a cathode ray tube to a face panel.

FIG. 5 is a view illustrating a frame supporting spring known in the related art by applying the bimetal as described above. Referring to the drawings, the support structure of the shadow mask will be described in more detail. When the shadow mask 1 is thermally expanded by the collision of an electron beam, the frame support spring 3 shown in the drawing has its upper portion (in the figure) at the lower portion. Compared to the high expansion, the spring (3) is then slightly pulsated relative to the stud pin (5) of the panel as a reference point, the crush is such that the shadow mask (1) is face panel By moving toward (4), the aperture of the shadow mask 1 and the trajectory of the electron beam coincide with each other, whereby color shift due to thermal expansion of the shadow mask 1 can be prevented in advance.

By the way, according to the frame support spring 3 described above, the structure of this spring, in particular, it is difficult to join the two pieces of metals 7 and 8 having different thermal strain coefficients to each other, that is, high expansion. After the metal (7) and the low-expansion rapid (8) are manufactured by the respective molds, the two parts are welded again, which complicates the manufacturing process, and when welding the two parts, thermal expansion between the traps The welding becomes poor due to the difference of, and as a result, it causes the shadowing of the shadow mask to act as a factor.

Accordingly, an object of the present invention is to provide a spring for supporting a frame of a cathode ray tube, which is to overcome the above-mentioned problems and improves the shadowing of the shadow mask without overcompensation or uncompensation.

In accordance with the above object, the present invention provides a coupling part including a hole inserted into the stud pin of the panel, an elastic part extending from the coupling part, a welding part for supporting the frame, and a length of 0.4L, which is coupled to the frame together with the welding part. ≤L ₁ ≤0.8L, proposes a frame support springs of the tube-part low-expansion thickness is formed in the range of 0.4T≤T ₁ ≤0.8T.

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

1 is a view showing a frame support spring of the cathode ray tube according to the present invention, in order to avoid the overlap of the drawings, the same parts as those in FIGS.

As can be seen from the drawing, the frame support spring according to the present invention has a coupling part 31 including a hole 9 fitted into the stud pin of the panel, and extends from the coupling part and is bent toward the shadow mask. The elastic part 32, the welding part 33 for supporting the frame on which the shadow mask is mounted, and the welding part 33 together with the welding part 33 are welded to the frame and have a low expansion ratio having a relatively low expansion ratio compared to the above-described components. It is comprised by the part 34.

Here, the coupling portion 31, the elastic portion 32 and the welding portion 33 is formed integrally, and is formed of a metal having a relatively high expansion rate compared to the low expansion portion 34, the high expansion member It is preferable to make general stainless steel, and the said low expansion part 34 is made of an invar alloy.

In addition, as shown in FIG. 2, the low-expansion portion 34 has a length of about 0.4L ≦ L ₁ ≦ 0.8L and a thickness of about 0.4T ≦ T ₁ ≦ 0.8T. Several experiments have shown that doming can be compensated.

That is, in the case of the conventionally known bi-metal spring, the compensation of the shadow mask is made within approximately 30 minutes after applying power to the cathode ray tube. A comparative example of the frame support spring according to the present invention is as follows. same.

Example 1

When L ₁ <0.4L, T ₁ <0.4T; 40 minutes or more (very poor compensation)

Example 2

0.4L≤L ₁ ≤0.8L, 0.4T≤T ₁ ≤0.8T; Doming reward in 20 minutes

Example 3

0.8L <L ₁ , 0.8T (T ₁ ; over 30 minutes

Therefore, according to the frame support spring of the present invention described above, since the welding failure caused by joining two pieces of metal 7 and 8 having different thermal strain coefficients to each other can be eliminated, the shadowing mask is helped. There is an advantage that can be well compensated.

3 is a view for explaining a method for manufacturing the frame support spring of the present invention, wherein the low-expansion member 36 is approximately 0.4T ≦ T ₁ ≦ with respect to the thickness T of the high-expansion member 37. Prepare a base material bonded to 0.8T, and the die (so that the joint line of the low expansion portion 34 and the welding portion 33 of the spring 30 coincides with the junction line of the low expansion member 36 and the high expansion member 37) (Not shown) and then the base material is punched to form a coupling portion including a low-expansion portion 34 of the spring 30, a weld portion 33, and a hole 9 inserted into the stud pins 5 of the panel. (31) and the elastic part 32 which connects this coupling part 31 and the said welding part 33 is formed at once.

In addition, although only one frame supporting spring is shown in FIG.

Therefore, according to the manufacturing method of the frame support spring of the present invention, it is possible to overcome the disadvantages that were a problem by joining two pieces of metal (7, 8) having a different thermal deformation coefficient to each other, After preparing the base material formed by joining the 36 and the rubbing member 37 to each other, the spring is manufactured by punching the base material, so that welding defects can be eliminated unlike before, and the manufacturing process is easy, and the productivity is improved. It has practicality that can be made.

As described above, the present invention is to improve the structure of the spring support spring, it is possible to compensate well the shadowing of the shadow mask, as well as to improve the productivity of the product by shortening the manufacturing process, It also has practicality of savings.

Claims (1)

A spring for suspending a frame on which a shadow mask is mounted on a stud pin of a cathode ray tube panel, the coupling portion 31 including a hole 9 fitted into the stud pin of the panel, and an elastic portion extending from the coupling portion. (32), a weld portion 33 for supporting the frame, and a weld portion 33 coupled to the frame together with a length of 0.4 ≦ L ₁ ≦ 0.8L and a thickness of 0.4T ≦ T ₁ ≦ 0.8T Frame support spring of the cathode ray tube, characterized in that consisting of a low-expansion portion (34).