JPH0574993B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a degaussing coil that is attached around the picture tube of a television receiver to remove the influence of magnetization caused by an external magnetic field on an aperture grill built into the picture tube of a television receiver. This relates to the installation method.

[Conventional technology]

Since the aperture grill built into the picture tube of a television receiver is made of a thin steel plate, the aperture grill may become magnetized by external magnetic fields such as earth's magnetism. Therefore, when the aperture grill is magnetized, the trajectory of the electron beam from the electron gun is disturbed near the aperture grill, resulting in a screen with degraded color purity.

Therefore, conventionally, in order to eliminate the influence of magnetization of the aperture grill, demagnetizing coils 2 to 5 were arranged around the picture tube 1 using a picture tube shield plate (not shown), as shown in FIGS. 4 and 5. However, each time the power is turned on, demagnetization of the aperture grille caused by an external magnetic field is demagnetized by degaussing coils 2 to 5 forming an automatic degaussing circuit.

[Problem that the invention seeks to solve]

In conventional television receivers, degaussing coils 2 to 5 are arranged around the picture tube 1 as shown in FIGS. 4 and 5 to demagnetize the aperture grille. Since the area (in the vertical direction of the picture tube 1) is small, the aperture grill cannot be sufficiently demagnetized.

By the way, in a normal television receiver, even with the conventional arrangement of the degaussing coils 2 to 5, the influence of magnetization of the aperture grill rarely appears on the screen to the extent that it causes color shift.

However, if the degaussing effect of the aperture grill is not sufficient, especially in large-sized television receivers, there is a problem that the screen will have degraded color purity when using fine pitch to obtain a high-quality screen.

In order to solve the above-mentioned problems, the present applicant first developed a degaussing coil mounting device (Utility Model Application No. 58-68778) which increased the projected area of the degaussing coil so that the aperture grill could be sufficiently demagnetized. Proposed.

FIG. 6 is a perspective view showing a degaussing coil mounting device previously proposed by the present applicant, in which 11 is a picture tube constituting a television receiver, and 12, 13, 14, and 15 are picture tubes 11 attached to the front casing. These are first, second, third, and fourth attachment parts provided at four corners for attachment.

Reference numeral 16 denotes a first degaussing coil, which is connected to the picture tube 11 from the upper surface of the picture tube 11 through the lower part of the first attachment part 12.
It is formed into a loop shape that passes from the upper back side to the lower part of the second attachment part 13.

Reference numeral 17 denotes a second degaussing coil, which passes from the bottom surface of the picture tube 11 to the upper part of the third mounting part 14, and connects the picture tube 11
It has a loop shape that passes from the lower back surface to the upper part of the fourth attachment part 15.

18 are the first and second degaussing coils 16 and 17;
A band stretched over the back of the picture tube 11,
The second degaussing coils 16 and 17 are fixed to the picture tube 11. Note that the portion indicated by the two-dot chain line is the front casing to which the picture tube 11 is attached.

As shown in FIG.
When the demagnetizing coils 16, 17 are arranged and fixed with the band 18, the first and second demagnetizing coils 16, 17
By applying an attenuating alternating current to the first and second degaussing coils 16 and 17 by an automatic degaussing circuit, the aperture grill built into the picture tube 11 can be effectively demagnetized. Therefore, the electron beam from the electron gun of the picture tube 11 is not disturbed near the aperture grill, and a screen with clear color purity can be obtained even with a fine-pitch picture tube.

However, the work of attaching the picture tube 11 to the front housing and attaching the first and second degaussing coils 16 and 17 around the picture tube 11 is done manually within the narrow front housing. Therefore, an accident occurs in which the first and second degaussing coils 16 and 17 are damaged during the installation work, resulting in problems such as poor work efficiency and difficulty in the installation work.

This invention was made in order to solve the above-mentioned problems, and the degaussing coil can be attached around the picture tube without damaging the degaussing coil, and the degaussing coil can be easily attached to the picture tube. This provides a method for installing the coil.

[Means for solving problems]

The method for installing the degaussing coil of this invention is to temporarily fix the degaussing coil to the inner wall of the front casing using a holding tool, then insert the picture tube from the rear of the front casing and hold it in place. Attach.
The degaussing coil is tilted toward the back side of the picture tube with two attachment portions on one side of the picture tube positioned within the loop of the degaussing coil.

[Effect]

In this invention, before inserting the picture tube into the front housing, the degaussing coil is temporarily fixed to the inner wall surface of the front housing using a presser. damage is prevented.
Furthermore, since the picture tube can be vertically inserted and attached into the front housing, the assembly process can be easily automated.

〔Example〕

Figures 1a to 1e are process diagrams showing the order of the method of installing the degaussing coil of the present invention. B
A cross section along the line is shown.

FIG. 2 is an enlarged perspective view of the presser, and FIG. 3 is an enlarged perspective view showing a portion of the presser and degaussing coil attached to the front casing, and the same reference numerals as in FIG. 2 indicate the same parts. In these figures, 21 is the front casing of the television receiver, which includes a bezel 22 and a front cabinet 24.
A rib 23 for regulating the position of the first and second degaussing coils 16 and 17 is provided at a predetermined location of the bezzle 22, and a plurality of bolts 25 are installed at the joint between the bezzle 22 and the front cabinet 24. It is attached as a fixed part. Note that the positions of the bolts 25 are made to correspond to the respective mounting portions 12 to 15 of the picture tube 11.

Reference numeral 26 denotes a holding device consisting of a locking piece 27 and a guide piece 28, which when attached to the corner of the front case 21 as shown in FIG. 1c and FIG. A gap is formed between the wall surfaces in which the first and second degaussing coils 16 and 17 are inserted.

Next, the attachment of the picture tube 11 and the first and second degaussing coils 16 and 17 will be explained.

First, as shown by the dotted lines in FIG. Place it via. And the second
The holding tool 26 shown in the figure is locked to the corner of the front cabinet 24 of the front case 21, and the first and second degaussing coils 16, 17 are placed between the front cabinet 24 and the guide piece 28 as shown in FIG. intervening, the first and second degaussing coils 1 as shown in FIG.
6 and 17 are fixed to the wall of the front casing 21. In this state, the first and second degaussing coils 1
6 and 17 are fixed at the four corners with pressers 26, when the picture tube 11 is inserted into the front housing 21 from the direction perpendicular to the plane of the paper in FIG. , the second degaussing coils 16, 17 can be inserted without damaging them. Then, the bolts 25 can be inserted into each of the attachment parts 12 to 15 provided on the picture tube 11.

Next, when the respective pressers 26 temporarily holding the first and second degaussing coils 16 and 17 are removed from the front casing 21, the first and second degaussing coils 16 and 17 are removed.
can be deformed toward the back side of the picture tube 11, so as shown in FIG. and fix the first and second degaussing coils 16, 17 to the picture tube 11.
The state is as shown in Figure e or Figure 6.

In this invention, since the first and second degaussing coils 16 and 17 are attached as described above, the picture tube 11
The picture tube 11 and the first and second degaussing coils 16 and 17 are not damaged when inserted.
Demagnetizing coils 16 and 17 can be attached. Furthermore, since the first and second degaussing coils 16 and 17 are temporarily fixed along the wall surface of the front casing 21 with a presser 26, the picture tube 11 can be attached by automatic assembly, and the assembly is easy. Work efficiency can be improved.

In addition, in the above embodiment, the first and second degaussing coils 16 and 17 were arranged above and below the front housing 21, but
It goes without saying that the first and second degaussing coils 16 and 17 can be arranged on the left and right sides of the front housing 21 and attached to the picture tube 11 in a similar configuration.

〔Effect of the invention〕

As explained above, the degaussing coil installation method of the present invention involves inserting and attaching the picture tube into the front casing with a pair of degaussing coils fixed to the wall of the front casing using a holder, and then attaching the holder to the wall of the front casing. Since the degaussing coils are removed and placed on the back side of the picture tube, and the degaussing coils are fixed in a predetermined shape, it is possible to position the two mounting parts on one side of the picture tube within the loop of the degaussing coil. This can be done easily, and each degaussing coil will not be damaged when inserted into the front housing of the picture tube. Furthermore, since the picture tube can be attached automatically, there are advantages such as improved working efficiency in assembling the television receiver.

[Brief explanation of the drawing]

Figures 1 a to e are process diagrams showing the method of attaching the degaussing coil of the present invention, Figure 2 is an enlarged perspective view of the presser;
Fig. 3 is an enlarged perspective view showing a part of the presser and degaussing coil attached to the front casing, Figs. 4 and 5 are rear views of the picture tube showing the mounting position of the conventional degaussing coil, and Fig. 6 1 is a perspective view showing a degaussing coil mounting device previously filed by the present applicant. In the figure, 11 is a picture tube, 12, 13, 14, 15
are the first, second, third, and fourth mounting parts, 16, 17
are the first and second degaussing coils, 18 is the band, 21
22 is a bezel, 23 is a rib, 24 is a front cabinet, 25 is a bolt, 26 is a presser, 27 is a locking piece, and 28 is a guide piece.

Claims (1)

[Claims] 1 Via a plurality of ribs provided inside the front casing of the television receiver on the side where the picture tube surface is located,
A part of a pair of loop-shaped degaussing coils is placed,
The other part of the degaussing coil is temporarily fixed to the inner surface of the front casing by a presser attached to the corner of the open end of the front casing, and then the picture tube is inserted into the front casing. Fixing the attachment part of the picture tube inside the front casing, removing the holding tool, and lowering the pair of loop-shaped degaussing coils that were temporarily held by the holding tool to the back side of the picture tube. A method for attaching a degaussing coil, characterized in that the degaussing coil is brought into abutment with a funnel portion of the picture tube.