JP2885874B2 - How to apply fluorescent material for fluorescent lamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly, to a method of applying a phosphor to a uniform thickness on the entire inner surface of a concave portion of a container having a concave portion.

2. Description of the Related Art Conventionally, a method of applying a phosphor suspension to an application surface includes, for example, holding a glass tube vertically and flowing down the phosphor suspension using a nozzle from an upper end opening of the glass tube. The phosphor was applied to the inner surface of the tube to a uniform thickness.

According to such a conventional phosphor coating method, a phosphor film having a relatively uniform thickness can be formed on a cylindrical one such as a glass tube. In the application to the inner surface of the shaped part, since the phosphor suspension is accumulated on the bottom part of the concave part, there is a problem that the phosphor film has an uneven thickness with a thick bottom part and a thin side part. There is also a problem that automation is not an issue, and mass production of a uniform light emitting unit is difficult.

The present invention has been made to solve the above problems,
It is an object of the present invention to provide a method of applying a phosphor of a fluorescent lamp, in which a phosphor film having a uniform thickness can be easily formed on the entire inner surface of a concave portion formed on a light emitting portion base.

Means for Solving the Problems In order to achieve the above object, a method for applying a phosphor of a fluorescent lamp according to the present invention comprises: immersing a phosphor applicator in a phosphor suspension and pulling up the phosphor applicator; Then, the phosphor suspension is attached to the outer peripheral surface, and then the phosphor applicator is inserted into the concave portion of the fluorescent lamp container, and the phosphor applicator is moved vertically, horizontally, and up and down to form the recess. The phosphor suspension that is in contact with the entire inner surface of the shape portion and adheres to the phosphor applicator is applied to the entire inner surface of the concave portion.

Further, the application of the phosphor suspension to the entire inner surface of the concave portion is performed by an orthogonal robot that operates vertically, horizontally and vertically.

Function The present invention provides a phosphor coating device having a phosphor suspension adhered therein in a vertical shape within a concave portion formed in a container by the above-described method.
Move in the horizontal and vertical directions to contact the entire inner surface of the concave part,
Since the phosphor suspension is applied to the entire inner surface of the concave portion, a phosphor film having a uniform thickness can be formed without accumulating the phosphor suspension on the bottom portion of the concave portion. In addition, by moving the phosphor applicator vertically, horizontally and vertically to apply
This makes it possible to use a Z-orthogonal robot, which facilitates automation.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a phosphor applicator 1 is made of stainless steel that is not immersed in an organic binder, and a fluorescent lamp container 2 is provided.
Following the concave portion 3 formed in the above, the shape and the size are inserted into the concave portion 3 with a small gap, and the mounting portion 1a is mounted on the coating apparatus. The container 2 is made of ceramic and has a surface 2a.
A concave portion 3 serving as a light emitting portion is formed in the light emitting portion. Then, after a phosphor film is formed on the entire inner surface of the concave portion 3, an electrode or the like is attached and the one surface 2a is covered and sealed with a glass plate or the like, and the fluorescent material used for a picture element or the like of a large color image display device is formed. It becomes a lamp.

The dimensions of the concave portion 3 in the embodiment of the present invention are 3 cm long and 1 c wide.
m, depth 1 cm, and the dimensions of the phosphor applicator 1 are 2.4
cm, width 0.7 cm, depth 0.7 cm. The phosphor coating is formed on the concave portion 3 of the container 2 thus formed as follows.

At least the lower surface and the outer peripheral surface of the phosphor applicator 1 are immersed in a phosphor suspension f (not shown) in which a rare earth phosphor is dispersed in a butyl acetate solution of ethylcellulose, and then the phosphor applicator 1 is pulled up to emit fluorescent light to the phosphor applicator 1. The body suspension f is attached (see FIG. 1 (b)). Next, the phosphor applicator 1 is inserted into the concave portion 3 formed in the container 2 so as to be vertically, horizontally, and vertically (hereinafter, referred to as a vertical direction).
(Referred to as XYZ directions), and the phosphor applicator 1 is brought into contact with the entire inner surface of the concave portion 3 so that the phosphor suspension f attached to the phosphor applicator 1 is applied to the entire inner surface of the concave portion 3. Apply (see FIG. 1 (c)). Thereafter, the phosphor applicator 1 is pulled up from the inside of the concave portion 3, and the application of the phosphor suspension f to the entire inner surface of the concave portion 3 is completed (see FIG. 1 (d)).

Container 2 coated with phosphor suspension f as described above
Is dried to form a phosphor film on the entire inner surface of the concave portion 3. Observation of the phosphor film revealed that the phosphor film had a substantially uniform thickness.

Phosphor suspension of a plurality of colors in FIG. 2 of a plurality formed in the container 2 concave portions 3a, 3b, for example, green and red emission suspension f _R, a concave portion 3b concave portion 3a shows a case of applying a phosphor suspension f _G respectively, the phosphor in a plurality of concave portions 3a, a plurality of phosphor applicator 1b corresponding to 3b, the coating method similar to the method described above with reference to 1c The suspensions f _R and f _G are applied to form a phosphor film.

FIG. 3 shows a case in which the phosphor coating method of the second embodiment described above is automated, and the phosphor coating tools 1b, 1c, 1d is attached at required intervals. Under the arm 11, the arranged containers 2, 2,... (In this embodiment, three concave portions 3a, 3b, 3c are formed in one container 2) are arranged in the X-axis direction. A transfer device C for intermittently transferring in one direction is provided. 13R, 13G, 13B is a tank for reserving the phosphor suspension f _R, f _G, the f _B.

To explain the operation of the above device, the arm 11 moves leftward on the Y axis, then moves downward on the Z axis, and moves the phosphor applicators 1b, 1c, 1d to the fluorescent light in the tanks 13R, 13G, 13B. Body suspension f _R ,
It is immersed in f _G and f _B respectively, and then returns to the original position through the reverse process. After that, the arm 11 moves downward on the Z axis,
A container in which the phosphor applicators 1b, 1c, and 1d are placed on the transfer device C
Insert into the concave portions 3a, 3b, 3c of 2,2, ... Subsequently, the arm 11 continuously moves in the XYZ directions, and the phosphor applicators 1b, 1c, 1
d is brought into contact with all the inner surfaces of the concave portions 3a, 3b, 3c, and the phosphor suspension f
_R, respectively applied f _G, the f _B concave portion 3a, 3b, the entire inner surface of 3c.

In this way, the phosphor suspensions f _R , f _R on the concave portions 3a, 3b, 3c
_G, After completion the application of f _B, the transfer device C is applied the container 2,2,
…… is transferred to the left on the X axis and discharged from the transfer device c.
It is transported by a transport belt 16 to a drying device (not shown).

The XYZ orthogonal type robot repeats the above operation, whereby the application of the phosphor suspensions f _R , f _G , f _B to the concave portions 3a, 3b, 3c is automatically performed.

As described above, according to the method for applying the phosphor of the fluorescent lamp of the embodiment of the present invention, the phosphor suspension f is attached to the phosphor applicator 1 and the phosphor applicator 1 is formed in the concave portion formed in the container 2. 3 and moved in the XYZ directions to contact the entire inner surface of the concave portion 3 and apply the phosphor suspension f to the entire inner surface of the concave portion 3.
A phosphor film having a uniform thickness can be formed.

In addition, since the phosphor applicator is moved while moving in the XYZ directions, an XYZ orthogonal type robot can be used, and automation is facilitated.

Effect of the Invention As described above, according to the present invention, the phosphor applicator to which the phosphor suspension is attached is placed inside the concave portion formed in the container.
The phosphor suspension is moved to the XYZ direction to abut the entire inner surface of the concave part, and the phosphor suspension is applied to the entire inner surface of the concave part, so that the phosphor suspension is uniform without accumulating on the bottom part of the concave part. It is possible to form a phosphor film having a suitable thickness. Also, set the phosphor coating tool to XY
Since the coating is performed while being moved in the Z direction, it is possible to use an XYZ orthogonal type robot, and it is possible to provide a method of applying the fluorescent substance of the fluorescent lamp, which can be easily automated.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view for explaining the steps of a method of applying a phosphor to a fluorescent lamp according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the second embodiment, and FIG. FIG. 3 is a perspective view of an automatic coating method by the XYZ orthogonal robot. 1 ... Phosphor coating device, 2 ... Container, 3 ... Concave part, f ...
... Phosphor suspension, R ... XYZ orthogonal robot.

Continued on the front page (72) Inventor Rikuo Kasuya 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Denshi Kogyo Co., Ltd. 56) References JP-A-62-188124 (JP, A) JP-A-1-217829 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 9/22

Claims (2)

(57) [Claims] 1. A phosphor applicator is immersed in a phosphor suspension and pulled up to attach the phosphor suspension to at least a lower surface and an outer peripheral surface of the phosphor applicator. The fluorescent material inserted into the concave portion of the lamp vessel and moved in the vertical, horizontal, and vertical directions so as to contact the entire inner surface of the concave portion and adhere to the fluorescent material applying device. A method for applying a phosphor for a fluorescent lamp, comprising applying a body suspension to the entire inner surface of the concave portion. 2. A method for applying a phosphor suspension to the entire inner surface of a concave portion.
2. The method for applying a phosphor of a fluorescent lamp according to claim 1, wherein the method is performed by an XYZ orthogonal type robot.