JP4109613B2 - Translucent display and method for manufacturing the same - Google Patents

Description

  The present invention provides a vehicle interior switch, an audio cover, or a translucent display body such as a vehicle exterior back panel in which display is performed such that characters, symbols, patterns, etc. shine out by irradiating light from behind. It relates to the manufacturing method.

Generally, a translucent display body such as a vehicle interior switch, an audio cover, or a vehicle exterior back panel is manufactured using a so-called two-color molding method in which two colors or two types of resins are integrally molded. In such a two-color molding method, a thermoplastic resin is usually used for both two-color or two-type resins. Then, conventionally, a primary resin layer having a display portion with characters or symbols protruding from the design surface of the translucent base material is molded, and after that, only the front end surface of the display portion is left so as to be light-shielding. A method for manufacturing a translucent display body in which a secondary resin layer is laminated on a design surface of a primary resin layer and integrated is known (see, for example, Patent Document 1).
JP-A-9-52254

  However, in the method for producing a translucent display by the two-color molding method as described above, both the primary resin layer and the secondary resin layer are made of a thermoplastic resin material. Since the thermoplastic resin material has a relatively high viscosity even in a molten state, it is difficult to enter every corner of the narrow cavity. For this reason, it was technically difficult to form the secondary resin layer thin.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a translucent display body and a method for manufacturing the same, in which it is easy to reduce the thickness of the surface material constituting the design surface.

In order to achieve the above object, the invention described in claim 1 is a method of manufacturing a light-transmitting display body having a light-transmitting portion and a light-blocking portion on a design surface, and a first step of forming a base material And a second step of forming a surface material on the surface of the base material in a layered manner, wherein the first step provides light transmission to the first cavity formed by the fixed mold and the first moving mold. A step of forming a base material having a convex portion on the surface by filling the resin having the resin, and the second step includes clamping the fixed mold and the second moving mold to form a tip of the convex portion. A second cavity is formed between the surface of the base material and the second moving mold, and the second cavity is filled with a light-shielding paint. a step of forming a surface material, the second cavity, as well as to 300μm thickness of not less than 20μm The gist is that the light transmitting portion and the light shielding portion are flush with each other, and the viscosity of the paint is 30 Pa · s to 50 Pa · s at 25 degrees Celsius .

Therefore, since the second cavity has a thickness of 20 μm or more and 300 μm or less, it is easy to reduce the thickness of the surface material constituting the design surface .

Moreover, since the light transmission part and the light-shielding part are flush with each other , the design surface is not uneven, so that the design property of the design surface can be improved.
Further, since the viscosity of the paint is 30 Pa · s or more and 50 Pa · s or less at 25 degrees Celsius, even if the thickness of the second cavity is as narrow as 20 μm or more and 300 μm or less, the corner in the second cavity is Since it is possible to make the paint enter as much as possible, it is easy to reduce the thickness of the surface material.
The gist of the invention described in claim 2 is that, in the invention described in claim 1 , the base material includes a surface extending in parallel with a direction in which the first and second moving molds open. To do.

  Therefore, even if the cross section of the design surface is U-shaped, that is, the design surface is bent at a right angle, the light shielding portion can be easily formed on the design surface. Therefore, it is convenient for molding a vehicle interior switch, an audio cover, and the like.

The gist of the invention described in claim 3 is that, in the invention described in claim 1 or 2 , the paint is a liquid thermosetting paint.
Therefore, since the liquid thermosetting paint has adhesiveness, it is possible to improve the peel resistance of the surface material with respect to the base material. In addition, since the liquid thermosetting paint has a low viscosity, even if the second cavity is narrow, the liquid thermosetting paint can easily enter every corner of the second cavity.

Invention of Claim 4 is a translucent display body provided with the light transmissive part and the light-shielding part in the design surface, Comprising: It manufactures with the manufacturing method as described in any one of Claims 1-3. and summarized in that it was.

  Therefore, since the thickness of the surface material is not less than 20 μm and not more than 300 μm, it is easy to reduce the thickness of the surface material constituting the design surface, and the translucent display can be made compact.

  ADVANTAGE OF THE INVENTION According to this invention, the translucent display body and its manufacturing method with which it is easy to make thin the thickness of the surface material which comprises a design surface can be provided.

Hereinafter, an embodiment in which the present invention is embodied in a vehicle interior switch will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the switch 11 as a light-transmitting display body of this embodiment includes a base material 12 and a surface material formed on the surface of the base material 12 so as to cover the surface in a layered manner. 13 and has a covered cylindrical shape having an upper wall 14 and a peripheral wall 15. The base material 12 is formed in a covered cylindrical shape from a resin having optical transparency. Protrusions 12a are formed on the upper surface of the base 12 so as to represent a predetermined pattern or the like. Here, the “light-transmitting resin” includes all resins that can transmit light regardless of being colored or colorless, or transparent or translucent, and is preferably made of a white resin. Examples of this resin include acrylic resin, polycarbonate resin, and urethane resin.

  The surface material 13 is made of a liquid thermosetting paint having a light shielding property, and is formed so as to cover the surface of the base material 12 other than the convex portions 12a. Here, “having light shielding properties” means a state of being colored to the extent that light cannot be transmitted. The surface material 13 is formed thinner than the base material 12. The thickness of the surface material 13 is preferably 20 μm or more and 300 μm or less, and more preferably 50 μm or more and 200 μm or less. When the thickness of the surface material 13 is less than 20 μm, it is difficult to block light, and when it is larger than 300 μm, it is not suitable for downsizing of the switch 11.

  And the thickness of the surface material 13 and the height of the convex part 12a of the said base material 12 are the same. That is, the front end surface 12b of the convex portion 12a and the surface 13a of the surface material 13 are flush with each other. The surface 13a of the surface material 13 constitutes the design surface 11a of the switch 11 and constitutes a light shielding portion, and the tip surface 12b of the convex portion 12a constitutes the design surface 11a of the switch 11, The light transmission part is comprised.

  Therefore, when the switch 11 irradiates light from behind (below), the light shielding portion blocks light and only the light transmitting portion transmits light, so that a predetermined pattern or the like shines on the design surface 11a. Is displayed.

Next, a manufacturing method of the switch 11 will be described with reference to FIGS.
A first mold 20 and a second mold 21 for manufacturing the switch 11 will be described.
The first mold 20 for molding the base material 12 includes a fixed mold 22 and a first moving mold 23, and the first cavity 24 is formed by clamping the mold in the vertical direction. It is like that. The second mold 21 for molding the surface material 13 on the surface of the substrate 12 is obtained by replacing the first moving mold 23 with a second moving mold 25, that is, the fixed mold 22 and The second moving mold 25 is configured. The second mold 21 is configured so that a second cavity 26 is formed between the surface of the substrate 12 and the second movable mold 25 by clamping the mold in the vertical direction.

The step of manufacturing the switch 11 includes a first step of forming the base material 12 and a second step of forming the surface material 13 on the surface of the base material 12 in layers.
As shown in FIG. 3, the first step is to fill the first cavity 24 formed by the fixed mold 22 and the first moving mold 23 with the resin having light transmittance from a gate (not shown). This is a step of forming the base material 12 having the convex portions 12a on the surface by solidifying. In this first step, after forming the base material 12, the first moving mold 23 is moved upward to open the first mold 20, and the first moving mold 23 is replaced with the second moving mold 25. To do. At this time, the side surface 12c of the base material 12 extends in parallel with the direction in which the first moving mold 23 opens.

  As shown in FIGS. 4 and 5, in the second process, the fixed mold 22 and the second moving mold 25 are placed in a state where the base material 12 molded in the first process is placed on the fixed mold 22. Are clamped to bring the tip end surface 12b of the convex portion 12a of the base 12 into close contact with the molding surface 25a of the second moving mold 25. Subsequently, in the second step, after the second cavity 26 is formed between the surface of the substrate 12 and the molding surface 25a of the second moving mold 25, the second cavity 26 has the light shielding property from a gate (not shown). The liquid thermosetting coating material is filled and cured to form a surface material 13 on the surface of the substrate 12. Accordingly, the switch 11 is formed by performing the second step after performing the first step.

  In the second step, the thickness of the second cavity 26 is preferably 20 μm or more and 300 μm or less, and more preferably 50 μm or more and 200 μm or less. Further, in the second step, the liquid thermosetting paint preferably has a viscosity of 3 Pa · s or more and 100 Pa · s or less at 25 degrees Celsius, preferably 30 Pa · s or more and 50 Pa · s or less. More preferably, it is used. When the viscosity of the liquid thermosetting paint at 25 degrees Celsius is less than 3 Pa · s, the liquid thermosetting paint enters the joint between the fixed mold 22 and the second moving mold 25, and burrs are generated. There is a risk that. Further, when the viscosity of the liquid thermosetting paint at 25 degrees Celsius is greater than 100 Pa · s, the liquid thermosetting paint may not sufficiently flow into every corner of the second cavity 26.

  Therefore, in the second step, the liquid thermosetting paint can be sufficiently poured into every corner even in the second cavity 26 having a very thin thickness as described above. At this time, since the front end surface 12b of the convex portion 12a of the substrate 12 and the molding surface 25a of the second moving mold 25 are in close contact, the surface material 13 is not formed on the front end surface 12b. .

After the switch 11 is formed, the second moving mold 25 is opened upward, and then the switch 11 is removed from the second mold 21.
According to the embodiment detailed above, the following effects are exhibited.

  -Since the 2nd cavity 26 is 20 micrometers or more and a thickness of 300 micrometers or less, it becomes easy to make thickness of the surface material 13 which comprises the said design surface 11a thin. For this reason, the switch 11 can be made compact. In addition, since the switch 11 does not become thicker, the operability of the switch 11 can be improved.

  -Since the front end surface 12b of the convex part 12a of the base material 12 and the surface 13a of the surface material 13 are the same, an unevenness | corrugation does not arise in the design surface 11a. For this reason, the designability of the design surface 11a can be improved.

  Since the side surface 12c of the base 12 is parallel to the direction in which the first and second moving molds 23 and 25 open, the cross section of the design surface 11a is a U-shape, that is, the design surface 11a. Even if it is bent at a right angle, the light shielding portion can be easily formed on the design surface 11a. Therefore, it is convenient for molding a vehicle interior switch or an audio cover having a design surface bent at a right angle. Furthermore, in the molding method in which the first moving mold 23 and the second moving mold 25 are exchanged, the thickness of the surface material 13 formed on the surface of the side surface 12c of the base 12 is set to the upper surface of the base 12 It is easy to make it the same as the thickness of the surface material 13 formed.

-Since the said liquid thermosetting type paint has adhesiveness, the peeling resistance of the surface material 13 with respect to the base material 12 can be improved.
The viscosity of the liquid thermosetting paint is 3 Pa · s or more and 100 Pa · s or less at 25 degrees Celsius, so even if the second cavity 26 is very narrow (thickness is 20 μm or more and 300 μm or less), the second cavity 26 Since the liquid thermosetting paint enters every corner, it is easy to reduce the thickness of the surface material 13 as compared with the case of using a thermoplastic resin. For this reason, the switch 11 can be formed compactly.

In addition, the said embodiment can also be changed and actualized as follows.
-You may use the translucent display body of the said embodiment for the emblem, back panel, center pillar, etc. of the front grille of a vehicle.

  -The light transmission part and the light-shielding part may not be flush with each other. For example, the tip surface 12 b of the convex portion 12 a of the base material 12 may protrude from the surface 13 a of the surface material 13, or the tip surface 12 b may be recessed from the surface 13 a of the surface material 13.

  The surface extending from the base material 12 in parallel with the direction in which the first and second moving molds 23 and 25 are opened may be omitted, and the base material 12 may have a flat plate shape.

The perspective view of the switch of embodiment. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. Sectional drawing which shows the effect | action at the time of base-material shaping | molding. Sectional drawing when a 2nd cavity is formed with a base material and a 2nd movement metal mold | die. Sectional drawing when filling a 2nd cavity with a liquid thermosetting type coating material.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Switch as a translucent display body, 11a ... Design surface, 12 ... Base material, 12a ... Convex part, 12b ... Front end surface which comprises a design surface and a light transmissive part, 12c ... The said 1st and 2nd moving mold Side surface as a surface extending parallel to the direction in which the mold opens, 13... Surface material, 13a... Design surface and surface constituting light shielding part, 22... Fixed mold, 23. 25 ... second moving mold, 26 ... second cavity.

Claims (4)

A method for producing a light-transmitting display body comprising a light-transmitting portion and a light-shielding portion on a design surface,
A first step of forming a base material, and a second step of forming a surface material into a layer on the surface of the base material,
The first step is a step of forming a substrate having a convex portion on the surface by filling a resin having light permeability into a first cavity formed by a fixed mold and a first moving mold.
In the second step, the fixed mold and the second moving mold are clamped to bring the tip end surface of the convex portion into contact with the second moving mold, and the surface of the base material and the second moving mold Forming a second cavity between the two moving molds, filling the second cavity with a light-shielding paint, and molding a surface material;
The second cavity has a thickness of 20 μm or more and 300 μm or less, and the light transmission part and the light shielding part are flush with each other,
A method for producing a translucent display , wherein the viscosity of the paint is 30 Pa · s to 50 Pa · s at 25 degrees Celsius . 2. The method for manufacturing a translucent display body according to claim 1 , wherein the substrate includes a surface extending in parallel with a direction in which the first and second moving molds open . The method for manufacturing a translucent display according to claim 1 , wherein the paint is a liquid thermosetting paint . A translucent display body having a light transmission part and a light shielding part on a design surface,
  The translucent display body manufactured by the manufacturing method as described in any one of Claims 1-3.

Images