JP3380914B2 - Manufacturing method of cathode ray tube - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cathode ray tube, and more particularly, to bonding a safety glass (SP) to a front surface of a panel of a cathode ray tube (CRT). It is about the method. 2. Description of the Related Art As shown in FIG. 5 (a), a CRT mainly comprises a panel 1 and a funnel 2, and a front panel (face panel) is used to strengthen the front of the conventional panel. ) As safety glass (hereinafter simply referred to as SP)
Is used. Recently, the SP surface is coated (thin film) for antireflection (Antireflection: AR), antistatic, and the like. Conventionally, such a method of bonding the safety glass or the SP as a protection plate to a panel surface of a CRT has been conventionally performed as shown in FIGS. 5 (a) and 5 (b).
A high-viscosity UV (ultraviolet) curable resin (hereinafter referred to as a seal resin) 3 for edging is applied to the peripheral edge of the front surface 1 a of the panel 1 except for a portion to be the opening 5. FIG. 6 shows a view in which the sealing resin 3 is adhered to the front surface 1a of the panel and the SP4 is mounted thereon. Next, as shown in FIG. 7 (a), a spacer 7 is arranged to form a gap 6 for keeping a constant interval between the panel front surface 1a and the SP. FIG. 8 shows the positional relationship of the spacer 7 on the panel 14 surface. Reference numeral 13 denotes an effective screen. After that, the SP4 is placed in alignment with the front surface 1a of the panel, and the SP4 is bonded to the sealing resin 3 by irradiating ultraviolet light from the front surface to cure the sealing resin 3, and sealing is performed except for the opening 5 ( Seal). Next, as shown in FIG. 9 (a), the angle between the panel front surface 1a and the base surface 11 is set to 90 °, the CRT is held with the opening 5 facing upward, and a low viscosity adhesive An ultraviolet curing resin (hereinafter referred to as an adhesive resin) 12 is injected from the opening 5 to fill the gap 6 between the panel front surface 1a and the SP4, and then the same 90 ° as shown in FIG.
Then, the step of irradiating ultraviolet rays from the front surface of the SP4 to cure the bonding resin 12 and bonding the SP4 to the panel front surface 1a is completed. When an adhesive resin is injected into the gap 6 between the front panel 1a and the safety glass SP4, the horizontal hydrostatic pressure due to the weight of the resin is SP.
4, the SP4 surface expands abnormally as shown in FIG. 7 (b). The size of the SP is 60 cm on each side, and the gap 6
If the width is 2 mm and the angle is 90 °, a water pressure of 100 kg is applied to SP4. [0007] Compared to the hydrostatic force (100 kg),
If the sealing force of the sealing resin 3 is large, it is good. However, if the sealing force is small, the sealing portion is naturally peeled off, and subsequently, the adhesive resin 12 leaks. This problem tends to occur particularly as the size of the CRT increases. Further, if the SP4 expands abnormally even if the above-mentioned seal portion does not peel off, the SP4 naturally expands.
Is out of the provided value, and requires a predetermined amount or more of the adhesive resin, which leads to an increase in manufacturing cost. Furthermore, when the adhesive resin is injected with the face panel surface facing downward (180 ° injection), the entire surface of the CRT is supported by the SP surface, so that the surface SP is damaged by contact with the support means. And dirt easily. In addition, since the face panel surface faces downward, after the adhesive resin is injected, the surface condition, for example, the presence of air and bubbles, cannot be checked, and the resin is cured as it is, resulting in a defective CRT. In order to solve the above-mentioned drawbacks, the present invention provides a method of bonding a safety glass (face plate) to a front surface of a panel of a cathode ray tube. It is another object of the present invention to provide a method of manufacturing a cathode ray tube which does not cause liquid leakage. According to the present invention, a sealing material is provided on the periphery of the front surface of a panel of a cathode ray tube, and a spacer is interposed between the sealing material and the front surface of the panel with a predetermined gap therebetween. The face panel is disposed facing the surface, the panel front face and the face panel are bonded and fixed by the sealing material, and the sealing material leaves an opening as an injection port at a part of a peripheral edge of the face panel and the panel front face. Forming a sealing frame for sealing the gap, injecting the casting resin from the opening into the gap surrounded by the sealing frame, and then curing and bonding the face panel to the front surface of the panel. In the method of manufacturing a tube, when the casting resin is injected into the gap and during curing thereafter, the front surface of the panel faces upward and the horizontal surface of the panel is formed. It is solved by the method for manufacturing a cathode ray tube, characterized in that degrees of the 10 ° to 40 °. According to the present invention, as shown in FIG. 1, the bonding resin 12 for bonding the front surface 1a of the CRT to the SP (face panel) 4 is formed in the gap. When pouring into the part 6, the angle between the front surface of the panel and the horizontal surface 11 is set to 20 ° (4 °).
(5 ° or less), the load of the hydrostatic pressure on SP4 is reduced, and liquid (resin) leakage from the seal portion is eliminated as shown in FIG. Further, as shown in FIG.
Is injected into the gap, and the curing treatment is performed at 0 ° (45 °).
In the same manner as described above, the load of the hydrostatic pressure on SP4 can be reduced. Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are schematic views showing one embodiment of the method of the present invention for bonding a safety glass (SP) as a face panel to a panel. FIG. 3 shows a flowchart of a UV (ultraviolet) resin process. First, the outer surface of the CRT panel and the inner surface of the face panel (SP) are polished (surface polished) with a glass cleaner or the like.
Then, the surface is further finished to remove dirt and dust on those surfaces. Next, a cavity 6 for injecting and filling a UV curable resin (adhesive resin) into the front surface of the panel is formed by applying a sealing resin as in the conventional case. The gap 6 is shown in FIG.
Set spacers 7 such as silicone rubber at predetermined positions (7 places in the figure) on the CRT surface shown in (1) (spacer set)
Then, it is formed by keeping the distance between the outer surface of the CRT panel and the inner surface of the face panel constant. Next, a face panel (Sa) is placed on the spacer 7.
A fety panel (SP) is placed and position adjustment (SP alignment) is performed. Thereafter, the injection port is sealed by applying a tape, and the sealing resin is cured by irradiating UV light with an irradiation energy of 360 mJ / cm ² (seal resin curing) to inject the adhesive resin. Make space for Next, in order to bond the face panel (SP) and the outer surface of the CRT, the SP is turned upward and an adhesive resin is used as a casting resin from the opening 5 as an injection port as shown in FIG. 4) After the four surfaces and the base surface are injected at an angle of 20 °, UV light (ultraviolet light) is applied at 500 mJ / c.
The adhesive resin was cured by irradiation with irradiation energy of m ² . At the time of curing the bonding resin, as shown in FIG.
The inclination was set to 0 °, that is, parallel to the base surface 11. Thereafter, the face panel surface is inspected and UV
The resin process was completed, and a CRT having a favorable face panel (SP) without peeling of the sealing resin or liquid leakage was obtained. In the above embodiment, a UV (ultraviolet) curable resin is used as the sealing material and the casting resin. In addition, a tape can be used as the sealing material without using the above resin. FIG. 4 is a diagram showing the relationship between the injection angle of the adhesive resin, the amount of SP displacement (bulge at the center portion), and the injection time of the resin. As shown in FIG. 4, when the bonding resin injection angle is 20 ° in this embodiment, it is of course 10 °, 30 °, 45 °.
Although no liquid leakage occurred in the case of °, the liquid leakage occurred in the case of 50 ° or 90 ° in the conventional method. As described above, according to the present invention, a face panel (safety glass or protective glass) of a cathode ray tube (CRT) is prevented from leaking due to peeling of a sealing portion when an adhesive resin is injected. In addition, after the bonding resin is cured, the outer surface can be manufactured to have a substantially predetermined curvature.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a method of injecting an adhesive resin for adhering a face panel (safety glass) to the panel. FIG. 2 is a schematic view showing a method of curing the adhesive resin injected in FIG. FIG. 3 is a flowchart showing a UV (ultraviolet) resin process. FIG. 4 is a diagram showing a relationship between an injection angle of a bonding resin, an SP displacement amount (bulge at a center portion), and a resin injection time. FIG. 5 is a side view and a plan view showing a state in which a sealing resin is adhered to a panel surface of a CRT in a conventional UV resin process. FIG. 6 is a partial side view showing a state in which a sealing resin is adhered to a panel surface of a CRT and a face panel (SP) is mounted thereon in a conventional UV resin process. FIG. 7 is a side view showing a state of a spacer and an adhesive resin. FIG. 8 is a plan view showing a position of a spacer. FIG. 9 is a partial side view showing a conventional example of an injection process and a curing process. [Description of Signs] 1,14 Panel 1a Panel front surface 2 Funnel 3 Seal resin 4 SP (safety glass or face panel) 5 Opening 6 Void 7 Spacer 11 Base surface 12 Adhesive resin 13 Effective screen

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-250531 (JP, A) JP-A-63-164141 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 9/24

Claims (1)

(57) [Claim 1] A sealing material is arranged on a peripheral edge of a front surface of a panel of a cathode ray tube, and a face panel is face-to-face arranged on a front surface of the panel through a predetermined gap with a spacer interposed therebetween. A sealing frame that adhesively fixes the front surface of the panel and the face panel with the sealing material and seals the gap with the sealing material leaving an opening as an inlet at a part of a peripheral edge of the face panel and the front surface of the panel; Forming, after injecting the casting resin from the opening into the space surrounded by the seal frame, curing, and bonding the face panel to the front surface of the cathode ray tube manufacturing method,
During the time and subsequent curing injecting the casting resin into the gap, the cathode ray tube, characterized in that the angle of the said front panel with the horizontal plane and 10 ° to 40 ° to the panel front surface facing up Manufacturing method.