JP2000318052A - Housing case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing case having a structure capable of simultaneously decorating a surface of the case and forming a display window by a method for insert molding when a housing case body is molded. SOLUTION: The housing case 1 is formed by pressure forming a synthetic resin sheet 13 with a transparent window 2a and another opaquely decorated portion to deeply draw the sheet 13, thereafter filling a transparent synthetic resin 14 on a rear surface of the sheet, insert molding it and integrally forming a display window W with the window 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing case for a communication device or an electric device having a display window.
The present invention relates to a housing case that can simultaneously decorate a surface and form a display window by a series of manufacturing steps, and is excellent in production efficiency.

[0002]

2. Description of the Related Art In recent years, with the spread of portable telephones, housing cases constituting the appearance of portable telephones are provided with various function displays with diversification of functions, and are distinguished from other products. For this reason, various patterns have been added.

[0003] Such decoration of the housing case is performed by hot stamping on a flat surface of the three-dimensional housing case, insert molding a plate on which a pattern is printed in advance when molding the housing case, Further, there has been a method of spraying and painting a three-dimensionally molded housing case.

On the other hand, in any of these decorating methods of the housing case, a transparent display window must be formed so that the liquid crystal display device disposed in the housing case can be visually recognized from the outside. To this end, a window hole is formed in the housing case, and a separate transparent resin cover is fitted therein.

[0005]

However, in the method of manufacturing a housing case as described above, a separate process of assembling the transparent resin cover and the housing case is required, which is troublesome, and the manufacturing cost of the housing case is reduced. There was a problem that it was still high.

Of course, it is conceivable to mold the housing case with a transparent resin and then decorate the housing case opaquely by a spray painting method, while leaving the window portion unclear. Did not.

Accordingly, an object of the present invention is to propose a housing case having a high manufacturing efficiency, in which the decoration operation and the display window forming operation can be performed simultaneously with the molding of the housing case body by the insert molding technique. I do.

[0008]

SUMMARY OF THE INVENTION A housing case according to the present invention is formed by deep-drawing a synthetic resin sheet whose window is transparent and the other is opaquely decorated, and then deep drawn.
The above object can be solved by proposing a housing case in which the rear surface of the sheet is filled with a transparent synthetic resin and insert-molded, and a display window is integrally formed with the window.

Further, the synthetic resin sheet which has been decorated in advance is formed by deep drawing by pressure forming, and thereafter, after opening a window hole, the back surface of the sheet is filled with a transparent synthetic resin and insert-molded. However, the above problem can also be solved by a housing case in which the display window is integrally formed by filling the window hole with a transparent synthetic resin.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a housing case of the present embodiment, FIG. 2 is an explanatory view of a deep drawing process of a synthetic resin sheet, FIG. 3 is a cross-sectional view of the synthetic resin sheet, FIG. FIG. 2 is a partial cross-sectional view taken along line xx of the housing case in FIG. 1.

As shown in FIG. 1, a housing case 1 of a mobile phone according to the present embodiment has a case body 2 formed of a decorative synthetic resin sheet layer 13 on the front surface and a transparent synthetic resin layer 14 on the rear surface. ing.

A transparent display window W is formed in a part of the case body 2 by viewing the transparent synthetic resin layer 14 on the back surface from the window hole 2a opened in the synthetic resin sheet layer 13. A plurality of button holes 3 are drilled.

This housing case 1 is not shown,
The mobile phone is configured by holding a board on which a communication electric element, a memory, and a push button to be fitted into the button hole 3 are arranged inside these components together with the other back case.

A method of manufacturing the housing case 1 will be described with reference to FIGS. A method for producing a synthetic resin sheet by the deep drawing process will be described with reference to FIGS.

As shown in FIG. 2A, first, a synthetic resin sheet piece 11 is prepared. The body 11 of the synthetic resin sheet piece 11
A is provided with a print 11b, and in particular, is provided with an area 11w that will become a display window W (see FIG. 1) of the housing case 1 in the future.

Here, the structure of the synthetic resin sheet 11 is shown in FIG.
This will be described below. FIG. 1 is a cross-sectional view of a synthetic resin sheet piece 11. The synthetic resin sheet piece 11A is formed from a synthetic resin material such as a printed layer 11x on which characters and partial patterns are printed from the front side, PET, polycarbonate, acrylic, and the like. The base sheet 11y and an adhesive layer 11z to be thermally welded are laminated. Among them, the base sheet 11y and the adhesive layer 11z are transparent, and a portion where the print layer 11x is not applied is left as a window area 11w in a transparent state.

Then, as shown in FIG. 2 (b), the synthetic resin sheet piece 11 is placed in a predetermined mold, heated, and deep drawn by a method of pressure forming in which the sheet 11 is pressed with high-pressure air in a softened state. . Thus, the compressed air-molded synthetic resin sheet 12
Is a three-dimensional sheet 12a excluding the margin 12b.

Next, as shown in FIG. 2 (c), the synthetic resin sheet 12 is trimmed by cutting off a margin 12b.
Further, a three-dimensional synthetic resin sheet 13 is formed by piercing a button hole (not shown). Most of the surface of the three-dimensional synthetic resin sheet 13 is covered with the printing layer 11x and becomes opaque, and the window 13w is formed.
Only remain transparent.

The insert molding process using the above-mentioned three-dimensional synthetic resin sheet 13 will be described with reference to FIG.

As shown in FIG. 4 (a), in the insert molding step, a mold comprising a fixed side mold plate 21, a core side mold plate 22, and a cavity side mold plate 23 is used. The molded three-dimensional synthetic resin sheet 13 is placed in the cavity 23a of the cavity-side mold plate 23 to prepare for insert molding.

Then, as shown in FIG.
Transparent resin is injected from the molding machine nozzle 24 through the introduction paths 21a and 22a of the fixed-side mold plate 21 and the core-side mold plate 22 by combining 21, 22, and 23. At this time, the three-dimensional synthetic resin sheet 13
Is fixed to the bottom surface of the cavity 23a of the cavity-side mold plate 23 by, for example, suction means without any gap, and the three-dimensional synthetic resin sheet
The transparent synthetic resin layer 14 is formed by injecting and injecting resin from the gate 22b into the space between the core 13 and the core-side mold plate 22.

When the injected resin cools and hardens, the adhesive layer 11z (see FIG. 3) on the back surface of the three-dimensional synthetic resin sheet 13 is integrated with the injected resin, and the three-dimensional synthetic resin sheet layer 13 and the transparent synthetic resin layer 14 Is formed.

Finally, as shown in FIG. 4 (c), the fixed mold plate 21, the core mold plate 22, and the cavity mold plate 23 are separated again, and the sprue 25 is removed from the introduction paths 21a, 22a. Thus, the housing case 1 is further removed from the cavity 23a of the cavity-side mold plate 23, and the insert molding step is completed.

The structure of the housing case 1 manufactured by the deep drawing process and the insert molding process will be described with reference to FIG. FIG. 3 is a sectional view taken along line xx of FIG.

As shown in FIG. 5, the housing case 1 has an outer three-dimensional synthetic resin sheet layer 13 and an inner transparent synthetic resin layer.
14 and a portion where the printed layer 11x is not formed remains as the window region 13w. Therefore, the display window W is formed except the transparent base sheet 11y, the adhesive layer 11z, and the transparent synthetic resin layer 14 through the window region 13w.

As described above, according to the present embodiment, the housing case 1 is formed through the deep drawing step and the insert molding step. Such housing case 1
According to this, a transparent window region 13w is formed by a portion of the synthetic resin sheet layer 13 that forms a part of the housing case body 2 and where the printed layer 11x is not formed.

By forming the transparent synthetic resin layer 14 on the back surface of the synthetic resin sheet layer 13 in the insert molding step, a display window W is formed by the window region 13w and the transparent synthetic resin layer 14. For this reason, higher manufacturing efficiency can be achieved as compared with the conventional method of manufacturing the window shield as a separate component and assembling it later.

The housing case 1 may be hard-coated on the entire display window W and the like in order to enhance the scratch resistance. However, a hard-coat layer may be further formed outside the printing layer 11x in advance. Good.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a partial cross-sectional view of the housing case of the second embodiment. In this embodiment, a window hole 2a is formed in a part of the main body 2 of the housing case 1 in advance, and a transparent synthetic resin is used for the window hole 2a during an insert forming step.
a, the display window W is formed at the same time.

In the three-dimensional synthetic resin sheet 13, the window 2 a is formed in the deep drawing step. Note that, in the case of the present embodiment, unlike the case of the first embodiment, the base sheet 11y and the adhesive layer 11z constituting the three-dimensional synthetic resin sheet 13 do not need to be transparent.

Then, an insert molding step (see FIG. 4)
By injecting a transparent resin at
This transparent resin enters the window hole 2a, and the display window W is formed here. On the other hand, the synthetic resin sheet layer 13 covers the transparent synthetic resin layer 14 in portions other than the window holes 2a, and the non-transparent housing case 1 is manufactured as a whole.

The button hole 3 (see FIG. 1) is structured so that the transparent resin does not enter, and the button hole 3 is a through hole.

In order to improve the scratch resistance, the display window W
In the case where a hard coat is applied to the entirety including the above, after the housing case 1 is formed, a coating operation of the hard coat can be performed by a later spraying operation.

A third embodiment of the present invention will be described with reference to FIGS. In the present embodiment, in the above-described deep drawing step, the synthetic resin sheet piece 11 whose base layer 11y is a surface layer is used.

As shown in FIG. 7, in the present embodiment, a base sheet 11y formed of a transparent synthetic resin is formed on the front side, a printed layer 11x is formed below the base sheet 11y, and an adhesive layer 11z is formed below the base sheet 11y.
The other synthetic resin sheet piece 11B laminated in this order is used.

The synthetic resin sheet piece 11B is subjected to the deep drawing step (see FIG. 2) and the insert molding step (see FIG. 4).
After that, it is processed into the housing case 1 shown in FIG.

FIG. 8 is a partial sectional view of a housing case according to the third embodiment. As shown in the figure, the housing case 1 is composed of an outer three-dimensional synthetic resin sheet layer 13 and an inner transparent synthetic resin layer 14, and a portion where the printed layer 11x is not formed remains as a window part region 13w. The display window W is formed by the outer transparent base sheet 11y, the inner transparent adhesive layer 11z, and the inner transparent synthetic resin layer 14 through the region 13w.

In the case of the housing case of this embodiment,
Since the printing layer 11x is covered by the base sheet 11y, the synthetic resin sheet piece 11 having excellent scratch resistance can be obtained. Further, since the printed layer 11x is visually recognized through the base sheet 11y, the printed layer 11x has a deeper pattern, and a more luxurious housing case can be provided.

In each of the first to third embodiments, a housing case for a cellular phone has been described as an example. However, the present invention is not limited to this, and an electronic device having a display window is not limited thereto. Of course, it can be used for housing cases of various devices such as a TV commander and a pager terminal.

[0040]

As described above, according to the housing case of the present invention, the display window can be formed simultaneously with the molding of the housing case body by the insert molding technique, and high production efficiency can be achieved. it can.

In particular, when a synthetic resin sheet whose window is transparent and the other is opaque is used, the non-printed portion of the transparent synthetic resin sheet layer and the transparent synthetic resin layer formed on the back surface thereof are used. During the insert molding process, the display window can be integrally formed.

When a window is opened in a part of the synthetic resin sheet, the transparent synthetic resin covering the window is filled when the transparent synthetic resin layer is formed on the back surface of the sheet. The window can be formed integrally.

[Brief description of the drawings]

FIG. 1 is a perspective view of a housing case according to a first embodiment.

FIG. 2 is an explanatory view of a deep drawing step of a synthetic resin sheet.

FIG. 3 is a sectional view of a synthetic resin sheet used in a deep drawing step.

FIG. 4 is an explanatory diagram of an insert molding step.

FIG. 5 is a partial cross-sectional view taken along line xx of the housing case in FIG. 1;

FIG. 6 is a partial cross-sectional view of a housing case according to a second embodiment.

FIG. 7 is a sectional view of a synthetic resin sheet used in a deep drawing step according to a third embodiment.

FIG. 8 is a partial cross-sectional view of a housing case according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing case 2 ... Housing case main body 2a ... Window hole 3 ... Button hole 11 ... Synthetic resin sheet piece 11x ... Printing layer 11y ... Base sheet 11z ... Adhesive layer 11w ... Window area 13 ... Synthetic resin sheet (layer) 13w ... Window 14: Transparent synthetic resin (layer) W: Display window

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 105: 20 (72) Inventor Ichiro Onizawa 5-29-10 Tachibana Sumida-ku, Tokyo Yoshida Yoshida Within the Industrial Co., Ltd. (72) Inventor Yukiharu Yubara 5-29-10 Tachibana, Sumida-ku, Tokyo F-term within the Yoshida Kogyo Co., Ltd. 4E360 AA02 AB04 AB05 AB12 AB42 BA15 BC05 BD03 BD07 EA14 EA29 EE03 EE05 EE13 FA02 FA08 GA53 GB26 GC08 4F206 AD05 AD08 AD24 AD27 AH42 JA07 JB13 JF05 4F213 AC03 AH42 WA08 WA54 WB11 WC01 WF01 WK01 WK03 5K023 AA07 BB04 LL06 QQ05 RR01

Claims (2)

[Claims] 1. A synthetic resin sheet whose window is transparent and the other is opaquely decorated is formed by deep drawing by pressure forming, and then the rear surface of the sheet is filled with a transparent synthetic resin and insert-molded. A housing case, wherein a display window is formed integrally with the window. 2. A synthetic resin sheet, which has been decorated in advance, is formed by deep drawing by pressure forming, and thereafter, after opening a window hole, the back surface of the sheet is filled with a transparent synthetic resin and insert-molded. A housing case, wherein the display window is integrally formed by filling the window hole with a transparent synthetic resin.