JPH04206227A - Baking method of applied tube for fluorescent lamp and device therefor - Google Patents

Abstract

PURPOSE:To apply for the baking of an applied tube for thin cylindrical fluorescent lamp which is longer than standard size by rotating a long and thin cylindrical hollow glass tube laterally, by rotating it around the shaft, and whereby heating it for each length in the furnace, so as to bake it. CONSTITUTION:A baking device is composed of a plurality of rotational rollers 5 for rotating a straight applied tube 1 for fluorescent lamp laterally, and for thus retaing it, an annular furnace 3 provided with a heating band 7 on the inside surface, a supporting board 4 for supporting the furnace and the rotational roller 5, and of a wire 6 for winding one end on a take-up means, and for mounting other end on the applied tube 1. Regarding the baking method, while the applied tube 1 for fluorescent lamp to which fluorescent paint is applied, is put laterally, the baking device is rotated around the shaft of the applied tube 1, in such a way that the applied tube is heated for each part of length from one end to the other end, so as to be baked. The applied tube 1 for thin cylindrical fluorescent lamp which is longer than standard size can thus be appropriately baked, while an applied tube 1 of standard size can also be baked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for firing coating tubes for fluorescent lamps, which are generally widely used. The present invention relates to a method and apparatus for firing coated tubes for fluorescent lamps, which are useful for firing tubes.

(Prior Art) Currently, linear fluorescent lamps are widely used mainly as home and industrial lighting equipment.

In a fluorescent lamp, a phosphor is coated on the inner surface of a hollow glass tube, the phosphor is caused to emit light by an electric discharge inside the hollow glass tube, and is used as a light source for illumination or the like.

Phosphors (for example, calcium halophosphate) are generally refined into powder, and it is not possible to directly and uniformly fix this powdered phosphor onto the inner surface of a hollow glass tube. Generally speaking, this powdered phosphor is mixed with a viscous organic solvent (e.g. nitrocellulose) to make a liquid fluorescent paint, and then this fluorescent paint is uniformly applied to the inner surface of a hollow glass tube. is used. The hollow glass tube coated with fluorescent paint is called a coated tube for fluorescent lamps.

However, this organic solvent is unnecessary after application, so
It must be removed in some way after application. Therefore, by taking advantage of the property that phosphors do not deteriorate even at high temperatures, but organic solvents burn and evaporate when heated to high temperatures, we heated the coated tube for fluorescent lamps in a furnace, removed the organic solvents by combustion, and produced phosphors. A commonly used method is to fix the material to the inner surface of a hollow glass tube.

This method is called firing of coated tubes for fluorescent lamps.

Currently, the common method for firing is to simultaneously heat the entire coated tube for a fluorescent lamp, and therefore the firing furnace needs to be large enough to cover the entire coated tube.

As mentioned above, fluorescent lamps are widely used mainly for illumination and are therefore in high demand. Therefore, fluorescent lamps are now mass-produced with standardized lengths and diameters, and firing furnaces are also made and used in sizes that suit the size of the fluorescent lamps.

On the other hand, when fluorescent lamps are used for special purposes, such as technology that uses them for dimensional inspection of products rather than for lighting,
A lamp that is longer than the width of the product being inspected may be required. However, conventional standardized fluorescent lamps cannot satisfy the above conditions. Therefore, it may be necessary to specially manufacture a linear fluorescent lamp with a long overall length that satisfies the above conditions.

(Problems to be Solved by the Invention) There are several problems in manufacturing fluorescent lamps that are longer than standard dimensions, one of which concerns the firing furnace. That is, as described above, the conventional method for firing coated tubes for fluorescent lamps is generally to heat the entire coated tube for fluorescent lamps in a dedicated furnace depending on the size of the fluorescent lamp.

Therefore, in order to fire a coated tube for a fluorescent lamp that is longer than the standard size using the conventional firing method, it is necessary to use a large-sized firing furnace corresponding to the length. However, since there is little demand for such long fluorescent lamps, it is undesirable from a cost standpoint to construct a large furnace specifically for them.

In view of the above-mentioned problems, the present invention is suitable for firing coated tubes for fluorescent lamps having a substantially elongated cylindrical shape longer than conventional standard dimensions, and is also applicable to firing coated tubes for fluorescent lamps having conventional standard dimensions.
Moreover, it is an object of the present invention to provide a method and apparatus for firing a coated tube for a fluorescent lamp, which can be realized simply and at low cost.

(Means for Solving the Problems) In order to solve the above problems, the method for firing a coated tube for a fluorescent lamp according to the present invention is to lay down a substantially elongated cylindrical hollow glass tube after coating with fluorescent paint, This method is characterized by heating and firing each section from one end to the other end while rotating the tube around its axis.

Further, in order to solve the above problems, the present invention provides a baking device for coated tubes for fluorescent lamps, which includes a furnace that is approximately circular and has a heating means (for example, a gas burner) on its inner surface, and a hollow glass tube after coating with fluorescent paint. a rotary holding means for holding the glass tube while rotating it around its axis; The apparatus is characterized in that it has a moving means for moving the annular furnace so as to pass through the center of the annular furnace in the axial direction, and performs the firing method described above.

As the rotation holding means here, for example, two elongated rotating rollers having a sufficient length in the axial direction are installed parallel to each other, horizontally, and at positions where their outer peripheral surfaces are close to each other. The book is installed parallel to the axial direction of the rotating roller, and its outer circumferential surface is in contact with the outer circumferential surface of the two rollers, and the two rotating rollers are rotated in the same direction around the axis. There is a device that holds the application tube while rotating it.

(Operations and Effects) The method and apparatus for firing a coated tube for a fluorescent lamp according to the present invention is a method and apparatus for firing a coated tube for a fluorescent lamp.
While lying on its side and rotating around the axis of the glass tube,
Since each part of the glass tube is heated and fired in a furnace from one end to the other, there is no need to heat the entire glass tube at the same time as in conventional firing methods, and it is possible to create an approximately elongated cylindrical tube that is longer than the standard size. It is suitable for firing coated tubes for fluorescent lamps, is adaptable to firing coated tubes for fluorescent lamps of standard dimensions, and can be realized simply and with low-cost equipment.

(Example) Examples of the method and apparatus for firing a coated tube for a fluorescent lamp according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view schematically showing the overall configuration of an embodiment of the firing apparatus for fluorescent lamp coated tubes according to the present invention, FIG. 2 is a view seen from the top, and FIG. Figure III-I
II end view, and FIG. 4 is an IV-IV end view of FIG.

First, the configuration of the firing apparatus of this example will be explained. 1st
As shown in FIGS. 3 to 3, the baking device of the present embodiment includes a large number of rotating rollers 5 that hold a linear coating tube 1 for a fluorescent lamp while rotating it horizontally, and a substantially annular roller. A furnace 3 having a heating zone 7 on its inner surface, a support pedestal 4 that supports the furnace and the rotating roller 5, and one end of which is wound around a winding means (not shown) and the other end of which is attached to the application tube 1. It consists of a wire 6 attached.

The rotating roller 5 is supported by a support means (not shown) so that its axial direction is horizontal, and a rotational force is applied around the axis by a driving means (not shown).

The rotating rollers 5 are supported in sets of two with their outer peripheral surfaces close to each other, and each set of rotating rollers 5 is arranged in a row in the axial direction at a predetermined interval.

As shown in FIG. 4, the outer circumferential surface of the application tube 1 comes into contact with the outer circumferential surface of each of the two rotating rollers 5, and as the rotating rollers 5 rotate in the direction of arrow B, the coating tube 1 is rotated in the direction of arrow C. It is held by the rotating roller 5 while rotating. Also, Figures 1 to 3
As shown in the figure, a connecting member 8 is attached to the coating tube 1 side of the wire 6.
is provided to prevent twisting of the wire 6 due to rotation of the coating tube 1.

Next, a method of firing a coated tube for a fluorescent lamp according to the present invention will be explained based on the operation of the firing apparatus of this embodiment.

As shown in Figures 1 to 3, the coated tube for fluorescent lamps is
While being rotated and held by a rotating roller 5, it is moved to pass through the center of the circular furnace 3 in the direction of arrow A by a wire 6 attached to the negative end.

At this time, as shown in FIG. 3, the coating tube 1 is heated by the heating zone 7 on the inner surface of the furnace 3, and is fired in sections from one end to the other end. Since the coating tube 1 is rotating around the axis during firing, bending or warping of the coating tube can be prevented.

The method and apparatus for firing a coated fluorescent lamp tube according to the present invention have been described above based on one embodiment, but the present invention is not limited to this embodiment. For example, in the embodiment described above, the applicator tube 1 is pulled by the wire 6, but the applicator tube 1 may be moved while being pushed. Further, in the above embodiment, the furnace 3 is fixed to the support frame 4,
Although the coating tube 1 is made movable, it is also possible to make the furnace 3 movable. Hereinafter, an embodiment in which the furnace 3 is made movable will be described based on the drawings.

FIG. 5 is a perspective view showing the overall structure of another embodiment of the firing apparatus for a coated tube for a fluorescent lamp according to the present invention.

As shown in FIG. 5, the baking device of this embodiment includes two rotating rollers 5 that hold a linear coating tube 1 for fluorescent lamps while rotating it horizontally, and a substantially annular roller 5 that holds the coating tube 1 horizontally. It consists of a furnace 3 having a heating zone on its side, and a support pedestal 4 that rotatably supports the rotary roller 5 around an axis and supports the furnace 3 so as to be movable in the direction of the arrow AB in the figure.

The feature of this embodiment is that the furnace 3 is installed movably on the support pedestal 4, whereas in the previous embodiment, the furnace 3 is fixedly installed on the support pedestal 4. The method of firing the coating tube l is as follows:
In the above embodiment, the coating tube 1 was fired while being moved, whereas in this embodiment, the furnace 3 is different in that the coating tube 1 is fired part by length from one end to the other end while moving. However, there is no difference in that the method for firing a coated tube for a fluorescent lamp according to the present invention is carried out.

As explained above, the method and apparatus for firing a coated tube for a fluorescent lamp according to the present invention can be modified in various ways without impairing its effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall configuration of an embodiment of the firing apparatus for fluorescent lamp coated tubes according to the present invention, FIG. 2 is a view seen from the top, and FIG. 3 is a JII iH end view, FIG. 4, FIG. 2 IV-Jv end view, and jf!
Figure i5 is a perspective view showing the overall configuration of another embodiment of the firing apparatus for a coated tube for a fluorescent lamp according to the present invention.

Claims (1)

[Claims] 1) After uniformly applying a fluorescent paint made by mixing a powdered phosphor in a viscous organic solvent to the inner surface of a substantially elongated cylindrical hollow glass tube, In a method of firing a fluorescent lamp in which a tube is heated in a furnace to remove the organic solvent in the fluorescent paint and fix only the phosphor to the inner surface of the hollow glass tube, the hollow glass tube after the fluorescent paint is applied. 1. A method for firing a fluorescent lamp, which comprises heating and firing each length of the glass tube from one end to the other in the furnace while rotating the glass tube on its axis around its axis. 2) a substantially annular furnace having a heating means on its inner surface; a rotating holding means for holding the hollow glass tube coated with the fluorescent paint while rotating it around its axis; and the rotating holding means or the above-mentioned The hollow glass tube in which the rotation holding means holds at least one of the approximately annular furnaces,
A coated tube for a fluorescent lamp, comprising a moving means for moving the substantially annular furnace so as to pass through the center in the axial direction, and for carrying out the method for firing a coated tube for a fluorescent lamp according to claim 1. firing equipment.