JP3364676B2 - CRT device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CRT (Cathode-
Ray Tube; cathode ray tube) relates equipment, and more particularly, to CRT device using <br/> degaussing coils for the CRT can be sufficiently high demagnetizing performance compact. In particular, it is useful for a television broadcast receiver and a computer display device.

[0002]

2. Description of the Related Art FIG. 7 is an explanatory diagram showing an example of a conventional CRT device 500. FIG. 6A is a perspective view of the inside of the CRT device 500 as viewed from the back. (B) is sectional drawing. The CRT device 500 performs color selection according to the electron gun 2 that emits electron beams R, G, B corresponding to each of the three primary colors (red, green, blue) and the incident angles of the electron beams R, G, B. Shadow mask 3 with holes and slits
And a CRT attached to the front of the CRT 4 for removing the magnetism of the shadow mask 3.
Degaussing Coil (Degaussing Coil) 5
1, the CRT 4 and the CRT degaussing coil 51
And a cabinet 5 for accommodating the. The degaussing current i flowing through the CRT degaussing coil 51 is
It is a gradually decreasing AC current that decays with time.

As shown in FIG. 8, the CRT degaussing coil 51 is constructed, for example, by winding an insulating film conducting wire 51a having a wire diameter φ1 = 0.45 to 0.8 mm for about 100 turns and insulating it with an insulating tape T. is there.

FIG. 9 is a block diagram showing another example of a conventional CRT device 600. (A) is a perspective view of the inside of the CRT device 600 as viewed from the back. (B) is sectional drawing. The CRT device 600 performs color selection according to the electron gun 2 that emits electron beams R, G, B corresponding to each of the three primary colors (red, green, blue) and the incident angles of the electron beams R, G, B. Shadow mask 3 with holes and slits
CRT 4 having CRTs, CRT degaussing coils 61-1 and 61-2 mounted above and below the rear surface of the CRT 4 for removing magnetizing of the shadow mask 3, and the CRT.
4 and the cabinet 5 that houses the CRT degaussing coils 61-2 and 61-2.
The degaussing current i flowing through the CRT degaussing coils 61-1 and 61-2 is a gradually decreasing AC current that decays with time.

As shown in FIG. 10, the CRT degaussing coils 61-1 and 61-2 have insulating film conductors 62a and 62b having a wire diameter φ2 = 0.6 mm when the screen size of the CRT 4 is 21 inches, for example. Is wound for about 100 turns, insulated with insulating tapes Ta and Tb, and then curved according to the roundness of the neck and funnel. Also, the CR
The degaussing coils 61-1 and 61-2 for T are, for example, the CR described above.
When the screen size of T4 is 36 inches, the wire diameter φ2 = 1.
The insulation film conductive wires 62a and 62b of 0 mm are wound for about 75 turns, insulated with the insulation tapes Ta and Tb, and then curved according to the roundness of the neck or the funnel.

[0006]

In the conventional CRT device 500 (600), the demagnetizing coil 51 (61) for CRT is used.
-1, 61-2) and the shadow mask 3 are large in distance, the demagnetizing magnetic force is easily attenuated, and the insulating film conducting wire 51a
Since it is necessary to wind (61a) 75 to 100 turns, there is a problem that the degaussing coil 51 (61-1, 61-2) for CRT becomes large. Instead of increasing the number of windings,
It may be possible to increase the amplitude of the degaussing current i, but new problems such as easy heat generation occur. An object of the present invention is to provide a CRT device using a CRT for degaussing coil which can sufficiently high demagnetizing performance compact.

[0007]

According to a first aspect of the present invention, in the present invention, there is provided a transparent insulating sheet in which a light-transmitting insulating material is formed into a sheet shape, and the inside of the transparent insulating sheet in a mode capable of generating a demagnetizing magnetic field. Conductive wire laid on the transparent insulating sheet
Alternatively, a degaussing coil for CRT having a formed conductive pattern is mounted on the display tube surface of the CRT.
To provide a CRT device . C according to the first aspect
In the RT device , the magnetic field for degaussing is generated from the conductive wire or the conductive pattern integrated with the transparent insulating sheet. Therefore, by mounting the transparent insulating sheet on the display tube surface of the CRT , the degaussing magnetic field is not significantly attenuated and degaussed. Target area (generally shadow
Mask) . Therefore, sufficient degaussing performance can be obtained even if the number of windings of the conductive wire or the conductive pattern or the number of elements is reduced to reduce the size.

[0008] In a second aspect, the present invention is transparent to light.
A first transparent insulating sheet made of a sheet of insulating material and an eraser
The first transparent insulating sheet in a mode capable of generating a magnetic field for magnetism
Lined upConductive wire or formed conductive pattern
And its conductive wireOr conductive patternAcross the first
The second transparent insulating sheet joined on the transparent insulating sheet
CRT degaussing coil equippedOn the display screen of the CRT
CRT device characterized by being mountedI will provide a. the above
CRT from the second viewpointapparatusThen, the first transparent insulation sheet
A magnetic field for degaussing between the second transparent insulating sheet and the
The conductive wire or conductive pattern for
Or both sides of the insulation pattern can be completely protected by insulation layers
It is possible to further improve the electrical interference with the outside and changes in characteristics over time.
It can be reduced.

[0009]

[0010]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this.

First Embodiment FIG. 1 shows a CRT device 1 according to the first embodiment of the present invention.
It is explanatory drawing which shows 00. (A) is a CRT device 100
It is the perspective view which looked at the inside of a from the front. (B) is sectional drawing. This CRT device 100 has three primary colors (red, green,
It has an electron gun 2 for emitting electron beams R, G, B corresponding to each color of (blue) and a shadow mask 3 with holes or slits for color selection according to the incident angles of the electron beams R, G, B. CRT4 and display screen D of CRT4
CRT degaussing coil 1 for removing magnetizing of the shadow mask 3, and the CRT 4 and the C
And a cabinet 5 accommodating the RT degaussing coil 1. Examples of the shadow mask 3 include a round hole shadow mask, a slot shadow mask, and an aperture grill shadow mask.

As shown in FIGS. 1 and 2, the CRT is
The degaussing coil 1 for use has a sheet-like first transparent insulating sheet 11a made of a light-transmitting insulating material, and a conductive material wired on the first transparent insulating sheet 11a in a manner capable of generating a degaussing magnetic field. The wire 12 and the first wire sandwiching the conductive wire 12
Second transparent insulating sheet 11b joined to the transparent insulating sheet 11a, and a lead wire 13 and a connector for flowing a degaussing current i supplied from an internal circuit (not shown) of the CRT device 100 to the conductive wire 12. And 14 are provided. Since the wire diameter φ of the conductive wire 12 is very small, for example, 0.03 to 0.1 mm, it is not noticeable on the screen.

FIG. 3 is an explanatory view showing a manufacturing process of the CRT degaussing coil 1. As shown in FIGS. 3A and 3B, conductive wires 12 are laid in a ladder shape on the transparent insulating sheet 11a. As shown in FIG. 3C, the lead wire 13
Is connected to the conductive wire 12. As shown in FIG. 3D, a second transparent insulating sheet 11b is bonded onto the first transparent insulating sheet 11a with the conductive wire 12 interposed therebetween.

FIG. 4 is a waveform diagram showing an example of the degaussing current (i in FIG. 1) flowing through the CRT degaussing coil 1. The degaussing current ie is a gradually decreasing alternating current that decays with time.

According to the above CRT device 100, the CRT
Since the CRT degaussing coil 1 in which the conductive wire 12 is sandwiched between the transparent insulating sheets 11a and 11b is attached on the display tube surface D of 4, the conductive wire 12 can be brought close to the shadow mask 3 and conductive. Even if the number of windings of the wire 12 (the number of elements) is reduced to reduce the size, the magnetizing of the shadow mask 3 can be sufficiently removed by the demagnetizing current i having a small amplitude. As a numerical example, if the product of the initial amplitude of the degaussing current i and the number of turns (the number of elements) required about 75 [aperture turn] in the past, the degaussing coil 1 for CRT has a 16 [aperture turn]. ] It can be reduced to the extent.

In the CRT device 100, the CRT degaussing coil 1 in which the conductive wire 12 is laid on the transparent insulating sheet 11a may be attached to the display tube surface D of the CRT 4.

-Second Embodiment- FIG. 5 is a perspective view showing a CRT degaussing coil 21 according to a second embodiment of the present invention. The CRT degaussing coil 21 includes a first transparent insulating sheet 11a, a conductive pattern 22 formed on the first transparent insulating sheet 11a in a manner capable of generating a degaussing magnetic field, and the conductive pattern 2 thereof.
The second transparent insulating sheet 11b is bonded to the first transparent insulating sheet 11a by sandwiching the second transparent insulating sheet 11a. According to the CRT degaussing coil 21 described above, the conductive pattern 22 having a small thickness can be easily manufactured in a short time by using a technique such as vapor deposition or etching, so that the thickness can be further reduced and the production efficiency can be improved.

-Third Embodiment-FIG. 6 is a CRT device 3 according to a third embodiment of the present invention.
It is explanatory drawing which shows 00. (A) is a CRT device 300
It is the perspective view which looked at the inside of a from the front. (B) is sectional drawing. In the CRT device 300, a conductive pattern 32 in a form capable of generating a degaussing magnetic field is printed on the display tube surface D of the CRT 4. The above CRT device 3
According to No. 00, since the conductive pattern 32 acting as a degaussing coil is directly formed on the display tube surface D of the CRT 4, the entire device can be made more compact, and the configuration can be further simplified to reduce the cost.

[0020]

According to the CRT device of the present invention, a conductive wire or a conductive pattern capable of generating a magnetic field for degaussing is integrated with a transparent insulating sheet and provided on the display tube surface of the CRT. Generally, it can be easily mounted near the shadow mask. As a result, sufficient degaussing performance can be obtained even if the number of turns and the number of turns of the coil are reduced to reduce the size.

[0021] Also, it is possible to suitably except for the magnetic susceptibility of the shadow mask of C RT, the color purity of the screen can be sufficiently increased.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a CRT device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a CRT degaussing coil mounted on the CRT device of FIG.

FIG. 3 is an explanatory view showing a manufacturing process of the CRT degaussing coil shown in FIG. 2;

FIG. 4 is a waveform diagram showing an example of a degaussing current.

FIG. 5 is a perspective view showing a CRT degaussing coil according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a CRT device according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing an example of a conventional CRT device.

8 is a perspective view showing a degaussing coil mounted on the CRT device of FIG. 6. FIG.

FIG. 9 is a perspective view showing another example of a conventional CRT device.

10 is a perspective view showing a degaussing coil mounted on the CRT device of FIG. 8. FIG.

[Explanation of symbols]

100,300 CRT device 1,21 CRT degaussing coil 2 electron gun 3 shadow mask 4 CRT 5 cabinets 11a, 11b Transparent insulating sheet 12 Conductive wire 13 lead wire 14 Connector 22, 32 Conductive pattern D display surface

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 29/86-29/98 H01J 29/00 H04N 9/29

Claims (2)

(57) [Claims] 1. A transparent insulating sheet in which a light-transmitting insulating material is formed into a sheet shape, and a conductive wire or a formation wire laid in or on the transparent insulating sheet in a mode capable of generating a degaussing magnetic field. The degaussing coil for CRT having the conductive pattern is mounted on the display tube surface of the CRT.
A CRT device characterized by the above . 2. A first transparent insulating sheet in the form of a sheet made of an insulating material that transmits light, and a conductive wire laid on the first transparent insulating sheet in a manner capable of generating a degaussing magnetic field.
Is the formed conductive pattern and its conductive lines or conductive patterns.
A degaussing coil for a CRT, comprising a second transparent insulating sheet bonded on the first transparent insulating sheet with a turn sandwiched therebetween.
Is mounted on the display tube surface of the CRT.
RT device .