JP2590969B2 - Method of manufacturing thick indicator panel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a transparent indicator panel used for a display unit of a television receiver or the like.

2. Description of the Related Art As a means for displaying a functional operation such as a power supply in a television receiver or the like, a long transparent molded panel is used. Silk printing is applied to the back of the transparent panel, and some of the display windows, such as LEDs, are cut out of the fabric, giving the transparent panel a sense of thickness and luxury.

A conventional indicator panel will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a transparent molded panel, 2 denotes silk printing, black printing is performed on the back surface of the panel 1, characters are white, and the display window 3 is printed without fabric. Panel 1
Are manufactured by injection molding, which is the most advantageous in terms of productivity and cost. Also, the back surface is often flat.

Problems to be Solved by the Invention However, according to the above manufacturing method, in order to make a transparent resin such as an acrylic resin into a product by injection molding, the thickness must be reduced.
If the thickness is not reduced to about 4 mm, the surface will sink, and the thickness must be limited. In addition, when performing silk printing or hot stamping on the back surface, for example, if there is a sink of 0.1 mm or more, printing cannot be performed. Therefore, a thick panel is made impossible by ordinary injection molding, and is manufactured by cutting an acrylic plate or a special molding method.

The present invention has been made in view of the above problems, and has as its object to provide a manufacturing method capable of forming an indicator panel by resin molding.

Means for Solving the Problems As described above, in order to enable thick molding that could not be performed by the conventional manufacturing method, the method for manufacturing an indicator panel of the present invention employs a curvature so that the front visible portion side is convex. In addition, in-molding is performed so that printing on the rear surface is transferred in a mold.

According to the manufacturing method described above, in the thick-wall molding, the protruding surface portion of the visible portion on the front side serves as an arch-like reinforcement in the cooling process, and sink marks are concentrated on the flat portion on the back surface. In addition, the sink marks on the flat surface portion on the back side cannot be printed by secondary processing after molding, but in the case of in-mold, they are transferred in a mold, so that there is no printing problem and a thick indicator panel can be produced.

EXAMPLE Hereinafter, a method for manufacturing a thick indicator panel according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a thick indicator panel obtained by a method for manufacturing a thick indicator panel according to one embodiment of the present invention.

In FIG. 1, 11 is a panel, 12 is a transfer printing surface by in-mold, and 13 is a display window, from which a part of the fabric has been removed. FIG. 2 shows a cross-sectional shape of the panel 11,
The broken line 14 in FIG. 2 indicates an isotherm. The highest resin temperature is at the intersection H (FIG. 2) perpendicular to the front and back surfaces, and the force causing sink marks acts in the direction of the arrow as shown in FIG. , Skin layer 15
Are stretched in an arch shape, and in reality, sink marks 16 are generated on the flat surface side of the back surface, that is, on the printing surface 12. However, since the printing on the printing surface 12 having the sink is an in-mold method, it is completed when the resin is filled in the mold, and there is no problem.

The sink mark is 0.1 mm or more, but the sink mark is generated smoothly and because it is the back surface, it is not seen that the sink mark is seen when viewed from the visible part that protrudes with curvature on the surface. It is.

As described above, according to the present embodiment, it becomes possible to mass-produce a thick indicator panel by resin molding, which could not be manufactured by conventional resin molding, thereby improving productivity and reducing production cost. .

Effects of the Invention As described above, according to the present invention, under normal injection conditions,
The sink that occurs on a flat surface due to its thick wall also has one surface protruding with a curvature, so that one surface protrudes in an arch shape with a curved surface during cooling, leading the sink to the back, and in-mold on the back where the sink occurs By simultaneously performing printing as an indicator panel, the function and accuracy as exterior parts can be sufficiently ensured. As a result, the thick indicator panel can be mass-produced by resin molding, and the practical effect is large.

[Brief description of the drawings]

1A and 1B are a front view and a side view of a thick indicator panel obtained by a method of manufacturing a thick indicator according to one embodiment of the present invention, and FIG. FIG. 3 is a schematic cross-sectional view showing the reason why the flat portion has no sink mark projection, and FIGS. 3A and 4B are a front view and a side view of a conventional indicator panel. 11 ... thick indicator panel, 12 ... printed surface, 13 ...
Display part, 14 ... isotherm distribution, 15 ... skin layer, 16 ... sink mark.

Claims (1)

(57) [Claims] 1. One surface of a resin is projected with a curvature by injection molding, and the other surface is a flat surface, and printing transfer for display, coloring, etc. is performed simultaneously with molding on this flat surface. A method for producing a thick-walled indicator panel.