JP2540842B2 - Fluorescent body electrodeposition equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fluorescent electrodeposition apparatus suitable for application in the case of forming a fluorescent surface of a cathode ray tube, for example, a portable small flat cathode ray tube. .

[Outline of Invention]

The present invention, an electrodeposition liquid tank containing the electrodeposition liquid of the phosphor,
And a holding means for holding the cathode ray tube panel, and the holding means holds the cathode ray tube panel portion immersed in the electrodeposition liquid in the electrodeposition liquid tank, and the fluorescent surface of the cathode ray tube panel part. As a structure having an electrode brush consisting of a number of thin metal wires that make electrical contact with the conductive layer formed in the forming part, voltage application between the conductive layer of the panel part and the counter electrode immersed in the electrodeposition liquid is ensured. Try to be stable.

[Conventional technology]

A cathode ray tube, for example, a small flat type cathode ray tube, has a flat glass cathode ray tube, for example, as shown in FIG. 6, a perspective view, FIG. 7 is a longitudinal sectional view thereof, and FIG. 8 is an exploded perspective view of the tube body. It consists of the body (1).

The tube body (1) is provided with first and second panel portions (3) and (4) which are opposed to each other and are joined and sealed by frit attachment so as to form a flat space (2) therebetween. The first and second panel portions (3) and (4) are similarly formed on one side by a funnel portion (5) that is joined and sealed by frit attachment. The funnel portion (5) is bonded and sealed to the first and second panel portions (3) and (4) at the large-diameter side open end (5a), and the small-diameter side open end (5b) is filled with electrons. The neck portion (7) in which the gun (6) is housed is welded.

As shown in the exploded perspective view of FIG. 8, the first and second panel portions (3) and (4) have main surfaces (3a) and (4a) facing each other and a funnel portion (5) thereof. Peripheral side surface (3b) extending from each of the other three side edges except the side edge joined to
And (4b), and the end faces corresponding to each other of the peripheral side faces (3b) and (4b) are frit-attached to form a flat space (2) between both panel parts (3) and (4). In this way, the panel portions (3) and (4) have side edges (3b) and (4b) that do not exist so that the flat space (2) communicates with the space inside the funnel portion (5). In the above, it is joined and sealed by frit attachment to the large-diameter open end (5a) of the funnel portion (5).

A conductive layer (8) made of, for example, an aluminum vapor-deposited film is formed on a predetermined portion of the inner surface of the surface (3a) of the first panel portion (3), and a fluorescent surface (9) is coated on the conductive layer (8) by electrodeposition. Is formed. A transparent conductive layer (11) is vapor-deposited on the fluorescent surface (9) through a protective film (10), for example. An inner conductive film (12) made of, for example, a carbon coating film is deposited on the inner surface of the funnel portion (5). And this internal conductive film (1
2) electrically connected to the funnel part (5), eg 1
From the anode button (13) provided on the side surface, through this conductive film (12), to the transparent conductive layer (11), and hence to the fluorescent surface (9), and further to the high voltage electrode of the electron gun (6), the high voltage required The anode voltage is applied.

In such a structure, the electron beam b generated from the electron gun (6) is bombarded on the fluorescent surface (9) so that the light emission from this is observed, for example, from the surface (4a) side of the panel section (4). Has been done. (14) shows a horizontal / vertical electromagnetic deflector for the electron beam b.

In the cathode ray tube having such a structure, the main surface of the panel portion (3) is joined to the above-mentioned first and second panel portions (3) and (4) and the funnel portion (5) prior to joining. Fluorescent body electrodeposition is performed in which a fluorescent surface (9) is formed on the conductive layer (8) formed on a predetermined portion of the inner surface of (3a).

Fluorescent body electrodeposition for forming such a fluorescent surface (9) is performed by, for example, attaching and holding a panel portion (3) having a conductive layer (8) formed on a predetermined portion of the inner surface thereof to a holding means thereof. The holding means is sequentially moved to a work position where each work is performed. First, the panel portion (3) is brought to the air blow work position to perform air blow processing to blow out dust and the like, and then brought to the fluorescent body electrodeposition work position and the fluorescent body electrodeposition placed here. The panel is immersed in the electrodeposition liquid in the liquid tank, and electricity is applied between the conductive layer (8) in the panel portion (3) and the electrode immersed in the electrodeposition liquid tank so that the conductive layer (8) is placed on the conductive layer (8). Fluorescent body electrodeposition on
After that, the panel holding means pulls the panel out of the electrodeposition liquid tank and brings it to the washing work position for washing.

In the case of such a method, the fluorescent electrodeposition work is
While the panel portion (3) was immersed in the electrodeposition solution, one electrode was electrically connected to the conductive layer (8) on the inner surface of the panel portion (3) and immersed in the electrodeposition solution. A power source is connected to the other counter electrode to apply a voltage to electrodeposit the phosphor on the conductive layer (8). However, since the connecting portion of the electrode to the conductive layer (8) serves as a mask that inhibits the attachment of the fluorescent substance, a defective portion in which the electrodeposition of the fluorescent substance is inhibited occurs. By the way, a structure in which the fluorescent surface (9) formed on the inner surface of the first panel portion (3) is observed from the side of the second panel portion (4) facing the fluorescent surface (9) as in the flat cathode ray tube described above. When taken, almost the entire contour of the fluorescent surface (9) is observed from the panel portion (4) side, so that the defective portion of the fluorescent body due to the electrode connecting portion at the time of electrodeposition to the conductive layer (8), that is, It is required that the electrode connecting portion has a surface area as small as possible and is provided outside the original contour of the fluorescent surface (9). However, when the area of the connecting portion of the electrodeposition electrode to the conductive layer (8) is reduced in this way, problems occur in stability of electrical connection, contact resistance and the like.

[Problems to be solved by the invention]

The present invention solves the problems of the area and electrical contact of the connecting portion of the electrodeposition electrode with respect to the conductive layer on the inner surface of the cathode ray tube panel in the fluorescent electrodeposition described above, and ensures a low resistance contact with a small area portion. To be able to connect the electrodeposited electrodes.

[Means for solving problems]

The present invention, as shown in FIG.
The cathode ray tube panel has an electrodeposition liquid tank (22) containing (1) and a holding means (23) for holding the cathode ray tube panel section (3), and the holding means (23) holds it. Conductive layer (8) formed on the fluorescent surface forming part of the cathode ray tube panel part (3) with the part (3) immersed in the electrodeposition liquid (51) in the electrodeposition liquid tank (22)
An electrode brush (27) consisting of a number of thin metal wires that make electrical contact with the electrode brush is provided.

As shown in FIG. 2, the electrode brush (27) is made up of a large number of, for example, 100 pieces, for example, stainless SUS 304, and a thin metal wire (30) having a diameter of, for example, 0.15 mm, is provided with support pieces ( It is formed by soldering to (31) with solder (32).

On the other hand, on the conductive layer (8) of the panel portion (3), as shown in FIG. 3, a small triangular protrusion (8a) is integrally formed outside the fluorescent surface forming portion, This protrusion (8a)
At, the free end of the thin metal wire (30) of the electrode brush (27) is elastically brought into pressure contact.

[Action]

When performing the fluorescent electrodeposition in the above-mentioned configuration, the protruding part of the conductive layer (8) of the panel part (3) is placed in the fluorescent electrodeposition liquid (51) contained in the electrodeposition liquid tank (22). Electrode brush (2a) on (8a)
The tip of 7) is soaked in an elastically pressed state, and the counter electrode (36) is soaked so as to face the inner surface of the panel (3), and this electrode (36) is used as the positive electrode side for both electrodes (27). ) And (36) is connected to a DC power supply (not shown), the fluorescent electrodeposition is performed on the conductive layer (8) of the panel section (3).

In this case, since the power source is connected to the conductive layer (8) by the elastic contact of the electrode brush (27) composed of a large number of metal fine wires (30), the connection is well made. That is, in this case, since the free ends of the thin metal wires (30) individually come into contact with the protruding portions (8a) of the conductive layer (8), they can be brought into good contact with each other, and further, during the electrodeposition work, The electrode brush (27) on the negative electrode side is also fluorescently electrodeposited, that is, coated with an insulating layer, but the electrode brush (27) is composed of a brush, that is, a large number of thin metal wires (30). Since the fluorescent substance is peeled off due to friction between the thin wires (30), bending, etc., electrical contact with the conductive layer (8) is always made with good low resistance contact even after repeated use. be able to.

The electrode brush (27) is composed of the thin metal wire (30) as described above, and the tip of the electrode brush (27) elastically contacts the protrusion (8a) of the conductive layer (8) of the panel (3). However, if the thin metal wire (30) is too thick, it will be repeated and the fluorescent substance will adhere by electrodeposition to prevent electrical contact with the protrusion (8a). Conversely, if it is too thin, electrical connection will occur. However, it is desirable to set the diameter to about 0.1 mm. If the number of thin metal wires is too small, the protrusion (8a)
Since there is a risk of insufficient contact with the above, it was found that about 100 wires should be selected as described above.

〔Example〕

 An embodiment of the present invention will be described.

In this example, an electrodeposition liquid tank (22) for performing fluorescent electrodeposition
Separately from the above, in order to perform the fluorescent electrodeposition, a preliminary electrodeposition liquid tank (21) is provided in which the panel portion (3) of the cathode ray tube body for performing the fluorescent electrodeposition is simply immersed in the electrodeposition liquid. With respect to the original electrodeposition liquid of (1), its wear is reduced to allow repeated use, and bubbles can be prevented from causing defects on the fluorescent surface.

In this example, as shown in FIG. 5, it has a panel holding means (23) which can be rotated around the central axis 0.

The panel holding means (23) is, for example, as shown in FIGS. 1 and 4, a support shaft (24) extending in the vertical direction, and a holding member for the panel portion on which the panel portion (3) is placed or clamped. Have (25). A rotating arm (26) is provided at the lower end of the support shaft (24), and an electrode brush (27) is provided at the tip thereof.
Is attached.

On the other hand, the support shaft (24) is provided with a sleeve (28) that slides along the longitudinal direction, and is provided between one end of the sleeve (28) and the rotary arm at one end thereof in accordance with the vertical movement of the sleeve (28). The protrusion (29a) engages with the guide groove (52) provided in the support shaft (24) and moves along the guide groove (52), whereby the rotating arm (26) is rotated clockwise and counterclockwise. A connecting arm (29) for rotating is provided.

A rotating arm (26) is elastically pushed downward by a spring (34) interposed between a sleeve (28) and a flange (33) integrally projected from the support shaft (24). ) Is brought to a predetermined rotational position in the clockwise direction, and the thin metal wire (30) of the electrode brush (27) elastically collides with the protruding portion (8a) of the conductive layer (8) of the panel portion (3). It is designed to do.

As shown in FIG. 5, the panel holding means (23) sequentially turns and holds in a plurality of areas on one circumference centered on the central axis 0, areas A _{1 to} A ₁₂ divided into 12 in the drawing. Is made to come. In the illustrated example, one panel holding means (23) is provided, but a plurality of panel holding means (23) are sequentially rotated in different regions in the same rotation direction, for example, clockwise rotation in the figure. It can be placed in a position and placed in different areas at the same time.

The first area A ₁ is an area where the panel section (3) is attached to the panel holding means (23), and the second area A ₂ is the panel section (3) attached to the holding means (23). ) Is blown to the panel portion or holding means (23) and further the electrode brush (27) to remove dust and the like adhering to the immersion material of the electrodeposition liquid in a subsequent step for cleaning. The first and second electrodeposition liquid tanks (21) and (22) containing the electrodeposition liquid are arranged in the regions A ₃ and A ₄ , respectively, which are air blow regions, and the fifth to ninth regions are arranged. First to fifth cleaning tanks (41) to (45) are arranged in A _{5 to} A ₉ , respectively. These first to first
The fifth cleaning layers (41) to (45) contain a cleaning liquid, for example, isoflopyl alcohol, and the cleaning liquid is circulated in some of the cleaning tanks or is agitated by a magnetic stirrer or the like. Done The area A ₁₀ and A ₁₁ of the first 10 and second 11 is configured as a dry area. The final area A ₁₂ is an area where the panel holding means (23) is detached from the panel portion (3).

In such a structure, the conductive layer (8) for forming the fluorescent surface of the panel portion (3), that is, for performing the fluorescent electrodeposition on the holder (25) of the panel holding means (23) in the region A _1. Place it toward the outer circumference.

Then, the panel holding means (23) is brought to the area A ₂ , and the panel portion (3), the holding means (23) and the electrode brush (27) are brought.
Performs an air blow process that blows clean air to the product to remove adhered substances.

Next, the panel holding means (23) is brought to the area A ₃ and its supporting shaft (24) is lowered to move the panel portion (3) to the electrodeposition liquid tank (2
Immerse in the electrodeposition solution in 1).

Then, this is pulled up and the panel portion (3) in a state in which the electrodeposition liquid is sufficiently adhered and wetted is brought to the position of the fourth area A ₄ , and the supporting shaft (24) is lowered again to lower the panel portion (3). 3) is immersed in the electrodeposition liquid in the second electrodeposition liquid tank (22). This area
The A _4, abutting poles (35 to abutment with the projecting portion which protrudes from the sleeve (28) of the holding means (23) as shown in Figure 1 (28A) by lowering of the support shaft (24) ) Is arranged and the panel holding means (23) is brought into this area A ₄ to lower the support shaft (24). At this time, the protrusion (28A) abuts against the abutment pole (35), whereby the sleeve (28) is lifted as shown by the arrow a against the biasing force of the spring (34). The rotating arm (26) is brought to the clockwise rotating position so that the electrode brush (27) projects from the conductive layer (8) of the panel (3) (8a).
Abut. In addition, the counter electrode (36) is immersed in the second electrodeposition liquid tank (22), and electricity is applied between the counter electrode (36) and the electrode brush (27) to cause the fluorescent electrodeposition. Work is done. In this manner, the electro-deposition of the phosphor, that is, the fluorescent surface (9) is formed on the conductive layer (8) on the inner surface of the panel portion (3).

After the electrodeposition work is completed, the support shaft (2
4) is lifted, and at the same time, the projection (28A) of the sleeve (28) is released from the butting pole (35), and the sleeve (28) restores the spring (34) as shown in FIG. The force moves downward along the support shaft (24), and accordingly, the rotating arm (26) rotates counterclockwise, and the electrode brush (27) causes the conductive layer (8) of the panel portion (3) to move. ) Separated from the protrusion (8a).

In this way, the support shaft (24) is pulled up, the panel portion (3) is pulled up from the second electrodeposition liquid tank (22), and then it is moved to the fifth region A ₅ to be supported again. The shaft (24) is lowered to immerse the panel section (3) in the cleaning liquid in the first cleaning tank (41) for cleaning.

The support shaft (24) is lifted again and the panel portion (3) is lifted from the cleaning tank (41), and the same operation is repeated, and the cleaning is sequentially performed in the _{sixth to ninth} regions A6 to A9.

Thereafter, a drying process is applied to each of the areas A ₁₀ and A ₁₁ , and the area is brought to the area A ₁₂ where the panel portion (3) is removed from the panel holding means (23).

The abutment pole (35) described above is provided only in the fourth region A ₄ , and as the support shaft (24) descends, it abuts the protrusion (28A) of the sleeve as described above and the electrode brush (27). ) Is to be rotated.

The electrodeposition liquids contained in the first and second electrodeposition liquid tanks (21) and (22) may have the same composition. For example, as the electrodeposition liquid, an electrodeposition liquid prepared by mixing a mixture of a fluorescent substance, indium oxide, aluminum nitrate and lanthanum nitrate with pure water, ifpropyl alcohol and glycerin and ultrasonically dispersing them can be used.

In the above example, the electrophoretic deposition of the panel (3) is performed in each of the ₁₂ areas A _{1 to} A ₁₂ as shown in FIG. It is possible to make various changes without being limited to the arrangement of, for example, a plurality of electrodeposition liquid tanks are arranged as the preliminary electrodeposition liquid tank (21), or the cleaning tank is not limited to the first to fifth Various modifications can be made such as arranging less or more than this.

As in the above-mentioned example, when the electrodeposition treatment is simply performed by dipping the panel portion (3) in another electrodeposition liquid tank prior to the electrodeposition treatment work by immersion in the electrodeposition liquid, , The panel portion (3) to be subjected to the fluorescent electrodeposition when immersed in the electrodeposition liquid for performing the original electrodeposition treatment work, and in actuality, the panel holding portion supporting the panel portion (3), and further It is in a state where it is previously wetted with the electrodeposition liquid in a portion of the panel portion (3) where the conductive layer (8) is immersed in the electrodeposition liquid such as a power feeding means,
In addition, when the electrodeposition solution is pulled up from the first electrodeposition solution, air bubbles are peeled off by the electrodeposition solution in the first electrodeposition solution tank (21), so that the electrodeposition solution is immersed in the second electrodeposition solution tank. The bubbles are effectively avoided, and the bubbles prevent defects in the attachment of the phosphor. Further, when the original electrodeposition solution tank (22) is immersed in the electrodeposition solution, the immersion product is already inserted in a wet state with the electrodeposition solution as described above, so that the second electrodeposition solution tank (22) When the soaked product is pulled up by this after the electrodeposition work in
As the electrodeposition liquid is removed along with this pulling up, a large amount of the electrodeposition liquid in the second electrodeposition liquid tank (22) where the original electrodeposition treatment is carried out is caused, a composition change occurs, and the electrodeposition liquid is contaminated. It is possible to effectively avoid such wear and to increase the number of times of repeated use of the electrodeposition liquid in the second electrodeposition liquid tank. Incidentally, in this way, the preliminary electrodeposition bath (2
When soaking in 1), the yield of defective products due to defects caused by bubbles on the fluorescent surface can be reduced and the yield can be improved by 10 to 15% compared to the case where this is not done. It was possible and the liquid life was improved by 30%.

〔The invention's effect〕

According to the present invention, the electrode brush (27) composed of a large number of thin metal wires (30) is used to feed power to the conductive layer (8) of the panel portion (3).
Since it is performed by the above method, the contact can be performed well. Therefore, by this, the protruding portion (8a) of the conductive layer (8) as a contact portion with the electrode brush (27).
Can be made sufficiently small, which brings about an advantage that the presence of the protruding portion (8a) of the electrode connecting portion is less noticeable toward the left in image observation.

In addition, since a large number of thin metal wires (30) are arranged, it is difficult for the fluorescent substance to adhere to the electrode brush (27) due to mutual rubbing, bending of each thin wire (30), etc. (2) can be connected to the protruding portion (8a) with low resistance, and good fluorescent electrodeposition can be performed, and its industrial advantages are great.

[Brief description of drawings]

FIG. 1 is a side view of an example of the device of the present invention, FIG. 2 is a front view of an example of an electrode brush, FIG. 3 is an inner view of a panel portion, and FIG. 4 is a side view of the panel holding means in one operating state. FIG. 5 is a layout view of an application example of the device of the present invention, FIG. 6 is a perspective view of a cathode ray tube for performing electrodeposition of a fluorescent substance by the device of the present invention, and FIG.
FIG. 8 is a longitudinal sectional view thereof, and FIG. 8 is an exploded perspective view of the tubular body. (1) is a flat glass cathode ray tube, (3) is a panel section,
(8) is a conductive layer, (9) is a fluorescent surface, (23) is a panel holding means, (27) is an electrode brush, (30) is its fine metal wire,
(21) and (22) are first and second electrodeposition liquid tanks.

Claims (1)

(57) [Claims] 1. An electrodeposition bath containing an electrodeposition liquid for a fluorescent substance, and holding means for holding a cathode ray tube panel portion, wherein the holding means is provided with a cathode ray tube panel portion held by the holding means. It has an electrode brush composed of a large number of fine metal wires that are in electrical contact with the conductive layer formed in the fluorescent surface forming portion of the cathode ray tube panel while being immersed in the electrodeposition liquid in the electrodeposition liquid tank. Fluorescent body electrodeposition equipment consisting of.