JPH01221836A - Manufacture of shadow mask - Google Patents

Abstract

PURPOSE:To improve yield by welding the peripheral part of a mask and the side wall part of a frame with the bottom of the frame so supported as to prevent the lowering thereof. CONSTITUTION:When a frame 2 is placed on top of a contact pin 15 and a restriction pin 4 is engaged with the insertion hole of a support spring 3 for fitting the frame 2, the load thereof works on a slider 14 via the contact pin 15, thereby causing the downward motion of the slider 14. When an air cylinder 27 is operated at this position and a rod 28 is thereby pushed forward, a support block 22 advances along a rail 20 due to the effect of a compression coil spring 21, and the sloped surfaces 16 and 23 of the slider 14 and the support block 22 come in compression contact with each other via urethane rubber 24, thereby locking the downward shift of the slider 14. In this condition, a mask 1 is coupled to the upper side of the frame 2 and welding is applied thereto. According to the aforesaid construction, yield is improved without straining the frame 2 and the mask 1 during a welding process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a shadow mask for a color cathode ray tube.

[Conventional technology]

As shown in Figure 2, the shadow mask ■ is made up of a mask ■ with a slit for color selection, a frame ■ that supports this mask, and a support spring ■ that has a heat correction function and a function for attaching it to a panel. ing.

The conventional manufacturing method for this shadow mask ■ is to fit the support spring ■ provided on the frame ■ to the regulation pin ■ provided on the frame holder ■, suspend the frame in the air,
Fit the mask (held by the mask holders) onto the frame, press welding electrodes (■) from multiple locations around the mask, and apply a welding current to separate the peripheral parts of the mask and the mask frame. The manufacturing method is to weld the welded part of the fitting part.

[Problem that the invention seeks to solve]

The drawbacks of the conventional shadow mask manufacturing method described above are:
In order to maintain the welding quality, the welding electrode rod ■ is pressed against the outside of the mask with a pressure of approximately 3 kg, so a large force is applied in the direction of lowering the frame during welding, resulting in the double-dot chain line in Figure 3. As shown in , the frame (2) and the mask (2) are welded with deformation. Therefore, the so-called q value (the gap between the inside surface of the panel of the display device and the shadow mask...The shadow mask is attached to the inside surface of the panel and has a color selection function, and the q value is important for that function, and the specified value A shadow mask was manufactured that could not satisfy the following requirements (which must be held accurately), and it could not be said that this method of manufacturing a shadow mask had a good product yield.

Therefore, in order to solve the problem of poor product yield due to the conventional shadow mask manufacturing method described above, the present inventors
After much consideration, we have finally completed the present invention.

[Means for solving problems]

That is, in the present invention, the regulating pin (2) provided on the frame holder (2) is inserted into the pin insertion hole of the support spring (2), which has a pin insertion hole provided in the frame (2), the frame is suspended in the air, and the frame is When fitting the mask held by the mask holding tool and welding the periphery of the mask and the side wall of the frame, the welding is performed while supporting the bottom of the frame so that the frame does not fall. This is a method for manufacturing a shadow mask.

〔Example〕

The frame support mechanism (2) used in the method of the present invention is as shown in FIG. A block-shaped slider ■ is installed between its lower surface and the base via a compression coil spring [phase] so that it can move up and down.This slider 0 has a contact pin [phase] on its upper surface that contacts the lower surface of the frame. A protruding layer 0 whose lower surface is formed into a slope (phase) is integrally formed on the upper side surface.

On the other hand, at the rear (right side) of the slider ■, there is provided a support block [phase] that is biased forward by a compression coil spring [phase] along the rail [phase] on the base board ■ and is movable back and forth. The upper surface of this support block is formed into a slope [phase] corresponding to the slope [phase] of the lower surface of the protruding shoulder, and urethane rubber [phase] is pasted to the top surface to prevent slipping. . In addition, the above-mentioned support block [stock] has a protrusion [phase] formed at its rear, and this protrusion and a rod [phase] provided at the tip of the air cylinder [phase] fixed to the support plate [phase]. The hook fittings [phase] engage with each other so that the support block [phase] is pulled back forward (to the left) only when the rod moves forward.

The above frame support mechanism is installed at the bottom of the frame at each welding point, and under normal conditions, the slider ■ becomes the stopper [phase] due to the action of the compression coil spring [phase].
In this state, the tip of the upper contact pin ■ is located slightly above the predetermined position of the frame ■ (the position where its side is supported by the regulating pin). When the frame ■ is placed on the top of the pin 9, the compression coil spring [
The slider ■ is designed to sink slightly against the pressure of the [phase].

[For production]

Therefore, in the state shown in Figure 1 (a), if the frame ■ is placed on top of the contact pin, and the regulating pin ■ is fitted into the insertion hole of the support spring ■ and suspended in the air, the load of the frame will be applied to the contact pin ] through the slider ■, and the slider descends as shown by the two-dot chain line. At this position, operate the air cylinder @ and move the rod [phase] forward (to the left)
When the support block [phase] is pushed forward, it moves forward along the slope [phase] by the action of the compression coil spring [phase], and as shown in Figure 1 (b), the slope [phase] of the slider ■ and the slope [phase] of the support block move forward. ] are in pressure contact via the urethane rubber [phase], and the downward movement of the slider (■) is locked.

In this state, the mask ■ is fitted from above the frame ■, and the welding electrode rod ■ is pressed against the side of the mask as conventionally shown in Figure 3 for welding. are installed at the bottom of each welding part, so the frame (2) and the mask (2) will not be distorted as shown by the two-dot chain line in Figure 8 during welding.

In addition, when releasing the above-mentioned lock, if the rod is pulled back by the air cylinder [phase], the support block [phase] is released through the protrusion [phase] at the bottom of the support block [phase] by the hook fitting [phase]. The state shown in Figure 1 (A) is reached, and the slider ■ also rises as before, except for the welded shadow mask ■.

〔Effect of the invention〕

The present invention has the configuration as described above, and when welding the peripheral part of the mask and the side wall part of the frame, the bottom surface of the frame is supported to prevent the frame from going down. Even when force is applied, the frame and mask do not deform.

Therefore, it is possible to always satisfy the so-called q value, which is a strict condition, and it can be said that this method of manufacturing shadow masks has an excellent product yield. The industrial value of the present invention is high considering that the number of masks is increasing and the strength of masks is becoming weaker.

[Brief explanation of the drawing]

FIG. 1 is a side view of a support mechanism used in carrying out the method of manufacturing a shadow mask of the present invention, in which (A) shows the support mechanism before support, and (Extension) shows the support mechanism during support. FIG. 2 is a schematic side view of a conventional shadow mask manufacturing apparatus, and FIG. 3 is a partial sectional view of a conventional welded part. A Shadow mask B Support mechanism

Claims (1)

[Claims] (1) Insert the regulation pin provided on the frame holder into the pin insertion hole of the support spring provided on the side of the frame to suspend the frame, and fit the mask held by the mask holding tool onto the frame. A method for manufacturing a shadow mask, characterized in that when welding the peripheral portion of the mask and the side wall portion of the frame, the welding is performed while supporting the bottom surface of the frame so that the frame does not fall.