JPH03225722A - How to dry electrodeposited substrates - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention utilizes electrophoresis to electrodeposit phosphor particles dispersed in an electrodeposition liquid onto segment electrodes arranged in an array on the surface of an electrodeposition substrate. The present invention also relates to a method of drying an electrodeposited substrate on which a phosphor screen has been formed by this electrodeposition.

(Prior Art) A method of electrodepositing phosphor particles using electrophoresis on a large number of segment electrodes arranged in an array on the surface of an electrodeposited substrate is disclosed in, for example, Japanese Patent Laid-Open No. 62-291836. An electrodeposition liquid in which phosphor particles are dispersed is placed in an electrodeposition bath, and a polygonal electrodeposited substrate is immersed in the electrodeposition liquid, and segment electrodes are placed on the surface of each electrodeposition substrate. A method is known in which a counter electrode is provided facing the segment electrode, a power source is connected between the counter electrode and the segment electrode to form an electric field, and phosphor particles are electrodeposited on the segment electrode.
As a method for drying an electrodeposited substrate on which a phosphor screen has been formed by this method, a method is widely known in which the electrodeposited substrate is removed from the electrodeposition solution and then dried in the state in which it is taken out.

(Problem to be Solved by the Invention) However, when the electrodeposited substrate is dried while being removed from the electrodeposition liquid as described above, the electrodeposition liquid remains on the surface of the electrodeposition substrate having a fluorescent screen. remains attached, so that when the electrodeposition liquid dries, the phosphor particles dispersed in the electrodeposition liquid remain on the surface of the electrodeposition substrate. These remaining phosphor particles tend to adhere to the phosphor screen on the segment electrodes that have already been formed by electrodeposition, which causes problems such as variations in the area of the phosphor screen and connection of dots on the phosphor screen. Further, even if it does not adhere to the fluorescent screen, if it adheres to the conductive material after the fluorescent tube is manufactured, it emits light, causing a problem of flare that causes variations in the amount of light.

Therefore, in the present invention, when the electrodeposited substrate is taken out from the electrodeposition solution,
The present invention provides a simple and highly reliable method for drying an electrodeposited substrate that eliminates the adverse effects of phosphor particles in the electrodeposition liquid remaining on the surface of the electrodeposited substrate.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention utilizes electrophoresis to form a large number of phosphor particles dispersed in an electrodeposition liquid in an array on the surface of an electrodeposition substrate. In this method, the electrodeposited substrate is taken out from the electrodeposition solution and dried, wherein the longitudinal direction of the segment electrode array formed on the surface of the electrodeposition substrate is horizontal, The electrodeposited substrate is placed in a direction such that the substrate surface is not parallel to the horizontal plane and dried.

Further, in the above method, a liquid having a high solubility in the dispersion medium of the phosphor particles dispersed in the electrodeposition liquid, or the above-mentioned dispersion medium, is poured onto the surface of the electrodeposition substrate having the phosphor screen in the early stage of drying.

(Function) According to the present invention, the amount of phosphor particles remaining on the electrodeposited substrate surface having a phosphor screen is extremely small.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Prior to that, first, an example of the structure of the electrodeposited substrate used in the embodiment of the present invention will be specifically explained.

In FIG. 5, reference numeral 6 indicates an electrodeposition substrate, and this electrodeposition substrate 6 consists of an aluminum electrode 2 patterned on a glass substrate 1 and a resist 3 arranged in the same manner on the glass substrate 1. It is composed of minute segment electrodes 4. In addition, phosphor particles dispersed in an electrodeposition liquid are electrodeposited on the segment electrodes 4 using electrophoresis to form a phosphor screen 5.

Here, the longitudinal direction of the segment electrodes 4 arranged and formed on the electrodeposited substrate surface is the direction in which the electrode rows are long, and is the direction indicated by the arrow a in the figure.

In addition, when there are multiple rows of 2 to 3 or more electrode rows,
By comparing the continuous length of the electrode rows with the continuous length of multiple electrode rows, the direction in which the electrode rows are continuous is determined to be the longitudinal direction.

Next, an embodiment corresponding to claim 1 of the present invention will be described in detail based on the drawings.

The electrodeposited substrate 6 described with reference to FIG. 5 has a fluorescent screen 5 formed in an electrodeposition liquid in which phosphor particles are dispersed using electrophoresis, and the electrodeposited substrate on which this fluorescent screen 5 is formed. 6 is dried after being taken out from the electrodeposition solution, and by this drying, excess electrodeposition solution adhering to the surface of the electrodeposition substrate is removed.

In performing this drying, the electrodeposited substrate 6 taken out from the electrodeposition solution is placed so that the longitudinal direction of the segment electrodes 4 arranged on the surface of the electrodeposition substrate is horizontal and as shown in FIG. The substrate is fixedly mounted on a jig 7 and dried under the condition that the surface of the substrate is not parallel to the horizontal plane. At this time,
Since the surface of the electrodeposited substrate is dried at an angle of θ with respect to the horizontal plane, the electrodeposition liquid 8 adhering to the surface of the electrodeposited substrate having the fluorescent screen 5 easily flows down in a short period of time. As a result, the phosphor particles 9 dispersed in the electrodeposited liquid 8 also flow down, so that the phosphor particles 9 are dried without remaining on the surface of the electrodeposited substrate.

Furthermore, since the longitudinal direction of the segment electrodes 4 is horizontal as described above, the electrodeposition liquid 8 attached to the electrodeposition substrate surface
When the phosphor particles 9 inside flow down, they have only a few opportunities to approach the phosphor screen 5 formed on the segment electrode 4, making it more difficult for the phosphor particles 9 to adhere to the phosphor screen 5.

In this example, the angle of inclination between the surface of the electrodeposited substrate and the horizontal plane shown in FIG. Depending on the positional relationship, etc., the longitudinal direction of the segment electrodes 4 arranged on the electrodeposited substrate surface should be horizontal, and the electrodeposition substrate surface should not be parallel to the horizontal plane. By selecting an appropriate angle, better drying can be achieved.

For example, as shown in FIG. 2 (1), if the electrodeposited substrate surface is set at an angle perpendicular to the horizontal plane and dried, the fluorescent screen 5 is positioned above the electrodeposited substrate. By doing so, only a small amount of the electrodeposition liquid 8 adhering to the electrodeposition substrate 6 comes into contact with the phosphor screen 5, so that the amount of phosphor particles 9 adhering to the phosphor screen 5 is also significantly reduced.

Furthermore, as shown in Figure (2), when the electrodeposited substrate is installed at an angle such that the surface faces a horizontal plane and dried, the properties of the phosphor particles 9 in the electrodeposited solution 8 are precipitated. If the electrodeposited substrate 6 is easily dried, the electrodeposition liquid 8 adhering to the electrodeposition substrate 6 will flow down in a hanging state, so that extremely effective drying can be performed without directly contacting the phosphor screen 5.

Next, an embodiment corresponding to claim 2 of the present invention will be described in detail based on the drawings.

As shown in FIG. 3, reference numeral 6 is the electrodeposited substrate explained in FIG. 5, and this electrodeposited substrate 6 taken out from the electrodeposition solution
was fixedly installed using the jig 7 as described in the above embodiment, and in order to wash away the electrodeposition liquid that had adhered to the electrodeposition substrate 6 having the phosphor screen 5 in the initial dry state, from above the surface of the electrodeposition substrate 6, A dispersion medium 10 containing phosphor particles dispersed in this electrodeposition liquid is poured.

When pouring this dispersion medium 10, it is poured through a supply pipe 11 installed above the electrodeposited substrate, but at a slow speed so as not to shine directly onto the fluorescent screen 5 on the surface of the electrodeposited substrate. Sprinkle.

This is because no time has elapsed since the phosphor particles were electrodeposited, so that they do not adversely affect the phosphor screen 5 that has already been formed.

Note that a sufficient effect can be obtained by pouring the dispersion medium 10 for about 10 seconds, and at this time, instead of using the above-mentioned dispersion medium, a liquid that easily dissolves in the dispersion medium of the electrodeposition liquid may be used. Either one may be used since they can have the same effect.

Furthermore, in this embodiment, it is not necessary to make the longitudinal direction of the segment electrodes 4 horizontal as described above, and as shown in FIG. The supply pipe 11 may be fixedly installed so that the dispersion medium 10 is poured over the electrodeposition substrate 6, and the electrodeposition liquid 8 adhering to the surface of the electrodeposition substrate may be washed away while rotating the holder 12.

This makes it possible to more reliably remove the phosphor particles adhering to the surface of the electrodeposited substrate and to perform better drying than the drying method according to claim 1.

(Effects of the Invention) As explained above, in the method for drying an electrodeposited substrate according to the present invention, the amount of phosphor particles remaining on the surface of the electrodeposited substrate having a fluorescent screen can be reduced to an extremely small amount. When the electrodeposited substrate is removed from the electrodeposition solution, it is possible to remove the adverse effects of the phosphor particles of the electrodeposition liquid adhering to the electrodeposition substrate on the phosphor screen, making it simple and reliable. It is possible to dry an electrodeposited substrate with a high content.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment corresponding to claim 1 of the present invention, FIG. 2 is a side view showing another embodiment corresponding to claim 1 of the present invention, and FIG. 3 is a side view showing another embodiment corresponding to claim 1 of the present invention. , a side view showing an embodiment corresponding to claim 2 of the present invention, No. 4
The figure is a side view showing another embodiment corresponding to claim 2 of the present invention, and FIG. 5 is a perspective view showing an example of the structure of an electrodeposited substrate used in the embodiment of the present invention. 1... Glass substrate, 2... Aluminum electrode, 3...
... Resist, 4... Segment electrode, 5... Fluorescent screen, 6... Electrodeposition substrate, 7... Jig, 8... Electrodeposition liquid, 9
...phosphor particles, 10...dispersion medium, 11...supply pipe, 12...to holder 4, 0 7y￥riJ 咄 hen a figure 40 form 5 country

Claims (1)

[Claims] 1. Using electrophoresis, phosphor particles dispersed in an electrodeposition liquid are electrodeposited onto a large number of segment electrodes arranged in an array on the surface of an electrodeposition substrate. In the method of removing from the electrodeposition solution and drying it, the longitudinal direction of the segment electrode array formed on the surface of the electrodeposition substrate is horizontal, and the electrodeposition is carried out in a direction such that the surface of the electrodeposition substrate is not parallel to the horizontal plane. A method for drying an electrodeposited substrate, characterized by drying the electrodeposited substrate in a state in which it is installed. 2. In claim 1, a liquid having a high solubility in the dispersion medium of the phosphor particles dispersed in the electrodeposition liquid, or a liquid having high solubility in the dispersion medium of the phosphor particles dispersed in the electrodeposition liquid, is poured onto the surface of the electrodeposited substrate having the phosphor screen in the early stage of drying, and then dried. A drying method characterized by: