JPS604363Y2 - Color cathode ray tube shadow mask support structure - Google Patents

Description

[Detailed description of the invention] This invention was developed in the process of manufacturing color cathode ray tubes, in which a shadow mask serving as a color selection mechanism can be mechanically attached to and removed from a face panel having a fluorescent surface. This invention relates to a mask support structure.

FIG. 1 is a partially cutaway side view of a conventional color cathode ray tube.

In this figure, reference numeral 1 denotes a glass bulb, which consists of a face panel 3 having a fluorescent screen 2 formed on its inner surface, a funnel 4, and a neck 5.

A support pin 7 is protruded (planted) on the inner surface of the funnel contact ON and e in the face panel 3, and a shadow mask 8 as a color selection mechanism is supported on this support pin 7 so as to face the fluorescent screen 2. has been done.

After the face panel 3 and the funnel 4 are welded with a frit glass 9, which is a welding glass, an electron gun 10 that emits an electron beam to the fluorescent screen 2 is enclosed in the neck 5, and the inside of the glass bulb 1 is maintained in a vacuum state. be done.

When manufacturing a color cathode ray tube, three colors of fluorescent elements are exposed to light corresponding to each color on the inner surface of the face panel 3 using a shadow mask 8.

After the fluorescent element is cured, unnecessary portions of the fluorescent material, that is, portions that were not irradiated with light during exposure, are washed away with water.

The shadow mask 8 is removed from the face panel 3 each time the fluorescent elements of each color are exposed and washed with water as described above.

As shown in FIG. 2, a large number of apertures 11 through which electron beams pass are formed in the shadow mask 8, and the peripheral edges of the apertures 11 are supported by a rectangular frame 12.

Also, each of the four sides of the frame 12 has a spring member 1 on every other side.
3, it is detachably supported by each support pin 7 of the face panel 3.

As shown in FIG. 3, the spring member 13 includes a fixing part 14 welded and fixed to the outer surface of the frame 12, a removable part 16 having a hole 15 that fits and locks into the support pin 7 of the face panel 3, and these fixing parts 14. and an elastic section 17 that connects the attachment/detachment section 16.

FIG. 3 shows the frame 12 of the shadow mask 8 with the spring member 1
3 is an enlarged view of a state where the support pin 7 of the face panel 3 is attached via the support pin 7 of the face panel 3.

When removing the shadow mask 8 from the face panel 3, it is necessary to bend the attachment/detachment portion 16 of the spring member 13 using the elastic portion 17 as shown by the broken line.

Incidentally, the spring member 13 is made of a steel plate with a thickness of 0.75Trgn.

In actual work, as shown in FIG. 4, the elastic part 17 is pressed by pressing the frame 12 against the support pin 7 side with the thumb 18 and pressing the detachable part 16 of the spring member 13 against the frame 12 side with the index finger 19. Flex it in the direction of arrow A, and remove the attachment/detachment part 16.
is detached from the support pin 7.

First, do this for one spring member 13 on the long side of the shadow mask 8, and then use both hands to pull the spring member 13 on the short side of the shadow mask 8 from each support pin 7 to the face panel 3. Then take out the shadow mask 8.

Attachment of the shadow mask 8 to the face panel 3 is performed by the reverse operation to the above.

In the above configuration, it is necessary to attach or detach the shadow mask 8 from the face panel 3 at least two times per minute in terms of production efficiency, and the actual number of attachments or removals is four times in total. Since this operation is required at least once, finger strength and skin strength are required, and it is necessary to attach and detach the shadow mask 8 without touching the inner surface of the face panel 3. It is a constant struggle and requires a high level of skill.

This invention was made to eliminate the above-mentioned drawbacks, and aims to provide a shadow mask support structure for a color cathode ray tube that can mechanize the attachment and detachment of the shadow mask and reduce manufacturing costs.

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 5 is a front view of a shadow mask support structure for a color cathode ray tube according to an embodiment of this invention.

In FIG. 5, parts having the same functions as those shown in FIGS. 1 to 4 are given the same numbers.

In FIG. 5, the shadow mask 8 is supported via a spring member 13 by a support pin 7 protruding from the inner surface of the funnel connection portion 6 in the face panel 3, as in the conventional case. .

As shown in FIG. 6, the spring member 13 has a fixing part 14 that is welded and fixed to the frame 12 of the shadow mask 8, and a detachable part 16 that has a hole 15 that fits and engages with the support pin 7 of the face panel 3. , consists of an elastic part 17 that diagonally connects the fixed part 14 and the detachable part 16, and the detachable part 16
A projecting piece 21 is provided on both sides of one end of the frame 12 in parallel with the frame 12 and projecting toward the fixed part 14 to form an acute corner part 20 with the elastic part 17.

The shadow mask 8 shown in FIG.
7, a rod-shaped jig 22 is inserted into the corner portion 22 formed between the elastic portion 17 of the spring member 13 and the protruding piece 21 in the direction of arrow B and engaged. In other words, after positioning, as shown by arrow A, frame 12
All you have to do is move to .

Then, as shown by the broken line, the spring member 1 is fixed by the jig 22.
The elastic portion 17 of 3 is bent, and the detachable portion 16 is detached from the support pin 7, allowing the shadow mask 8 to be taken out from the face panel 3.

When reattaching the shadow mask 8 to the face panel 3, perform the operation in reverse to the above to open the hole 1 of the spring member 13.
5 may be fitted onto the support pin 7.

In this way, the shadow mask 8 can be attached to and removed from the face panel 3 without directly touching the spring member 13.

Moreover, the movement of the jig 22 during attachment and detachment of the shadow mask 8 is constant, and therefore, due to this movement, it is possible to mechanize the attachment and detachment process of the shadow mask 8, which hitherto required a skilled person, and to reduce manufacturing costs. .

FIG. 8 is a perspective view of the spring member 13 in its original form, that is, immediately after punching.

As can be seen from this, the spring member 13 according to the present invention only needs to be provided with the protruding piece 21 in the conventional one, and it can also be easily obtained by integrally forming the fixed part 14, the detachable part 16, and the elastic part 17. I can do it.

As can be seen from the above explanation, according to this invention, support pins are provided on the inner surface of the funnel connection part of the face panel,
In a color cathode ray tube in which a frame of a shadow mask is detachably supported on this support pin via a spring member, by simply changing the shape of a part of the member,
The process of attaching and detaching the shadow mask, which hitherto required skilled workers, can be mechanized and manufacturing costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of a conventional color cathode ray tube;
The figure is a perspective view of a conventional shadow mask structure, FIG. 3 is a partially enlarged front view of a conventional shadow mask support structure, FIG. 4 is an explanatory diagram for manually attaching and detaching a conventional shadow mask, and FIG.
The figure is a front view of a shadow mask support structure for a color cathode ray tube according to an embodiment of this invention, FIG. 6 is a perspective view of a spring member according to this invention, and FIG. 7 is a use of the spring member shown in FIG. 6. The explanatory drawing, FIG. 8, is a perspective view of the spring member shown in FIG. 6 in its original state. 3...Face panel, 6...Funnel connection part, 7...Support pin, butt...Shadow mask, 12...Frame, 13 ...
... Spring member, 14... Fixed part, 15...
... Hole, 16 ... Detachable part, 17 - Curved/elastic part, 20 ... Corner part, 21 ... Protruding piece. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a color cathode ray tube in which a support pin is protruded from the inner surface of the funnel connection part of the face panel and a frame of a shadow mask is detachably supported on the support pin via a spring member, the spring member is fitted and engaged with the support pin. It consists of a removable part provided with a hole for fixing, a fixed part fixed to the frame, and an elastic part connecting the fixed part and the removable part diagonally. A shadow mask support structure for a color cathode ray tube, characterized in that a protrusion protrudes in parallel toward the fixed part and forms an acute corner with the elastic part.