JP2006281449A - Case molding member and case molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a case molding member satisfied from a qualitative aspect especially in a case molding member having a wall part integrally molded on the inner surface side of a case main body, and its molding method. <P>SOLUTION: The case molding member 1 is molded using a mold composed of a core mold and a cavity mold and comprises a perspective part 16 (case main body) having a face part 14 and a peripheral wall 15 and the wall part 17 integrally molded on the inner surface side of the peripheral wall 15. The protruded part 18 protruded from the wall part 17 and positioned by the core mold is provided on the leading end side of the peripheral wall 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a case forming member having a wall portion integrally formed on the inner surface side of a case body and a forming method thereof.

For example, an instrument case mounted on a motorcycle has a transparent glass 9 and a case 8 in consideration of waterproofness, dustproofness and assembly workability as disclosed in FIG. Often formed integrally. As described on page 7 of the specification, the method for forming a case described in Patent Document 1 uses a transparent synthetic resin glass 9 integrated with a pre-formed light guide plate 10 as a fixed mold and a movable mold. The case 8 is molded by pouring molten resin into the gap between the fixed mold and the movable mold, that is, the gap located on the outer peripheral surface of the light guide plate 10, and the glass 9 and the case 8 are integrated. Is formed.
Japanese Utility Model Publication No. 54-160045

  However, the glass 9 in Patent Document 1 has a long light guide plate 10 portion, and the lower end of the light guide plate 10 is opened. Therefore, when the glass 9 (light guide plate 10) alone is molded, the lower end side of the light guide plate 10 may be slightly distorted. If the case 8 is molded in a state of being deformed to the outside, the plate thickness of the case 8 at the deformed portion may become thin and the light guide plate 10 surface may be exposed. Alternatively, although not disclosed, the case 8 may be integrally formed on the inner peripheral surface of the light guide plate 10. In that case, a gap corresponding to the thickness of the case 8 is provided in the inner periphery of the light guide plate 10 and the molding die is disposed (there is a gap between the molding die and the light guide plate 10). Due to the injection pressure, the lower end side of the light guide plate 10 is easily deformed inward, and the light guide plate 10 may be cracked or broken.

  The present invention has been made in view of such points, and in particular, a case molding member and a molding method thereof that satisfy quality in case of a case molding member having a wall portion integrally formed on the inner surface side of the case body. The purpose is to provide.

  In order to achieve the above object, the present invention is a case molding member molded using a molding die, wherein the case molding member is integrally molded on a case body having a surface portion and a peripheral wall, and at least on the inner surface side of the peripheral wall. And a protruding portion that protrudes from the wall portion and can be positioned by the molding die.

  Further, a case forming member comprising a case main body having a surface portion and a peripheral wall, a wall portion integrally formed on at least an inner surface side of the peripheral wall, and a protruding portion protruding from the wall portion on the distal end side of the peripheral wall, A molding method of a case molding member that is molded using a molding die comprising a core mold and a cavity mold, the projecting portion of the case body being inserted into a guide hole provided in the core mold, and the case body After positioning the core mold, the core mold and the mold are closed, and synthetic resin is injected into the molding space.

  In particular, even a case forming member having a wall portion integrally formed on the inner surface side of the case main body, a case forming member satisfying quality and a forming method thereof can be obtained.

  A display device for a vehicle to which a case forming member of the present invention is applied will be described as an embodiment. FIG. 1 is a cross-sectional view of the display device, and FIG. 2 is a rear view of the case forming member. FIG. 3 is a partial perspective view of a single case body viewed from the back side. FIG. 4 shows a schematic mold structure when the case molding member is molded, and is a cross-sectional view of a state where the molding die is open. FIG. 5 shows a schematic mold structure when the case molding member is molded, It is sectional drawing of the state which closed the shaping die. In the present embodiment, the case body is described as a see-through portion.

  The display device includes a case forming member 1 and a liquid crystal display 2 housed in the case forming member 1. The liquid crystal display 2 includes, for example, a liquid crystal display panel 3 on which the speed, travel distance, fuel remaining amount, time, and the like of the vehicle are displayed, and a diffusion plate 4 that is disposed on the back side of the liquid crystal display panel 3 and has light transmittance. A holder 5 made of a white synthetic resin, on which the liquid crystal display panel 3 and the diffusion plate 4 are supported, a hard circuit board 6 disposed behind the holder 5 and electrically connected to the liquid crystal display panel 3, and a liquid crystal A panel holder 8 having a frame-like edge 7 covering the periphery of the display panel 3 and a light emitting diode 9 mounted on the circuit board 6 as a light source for illuminating the liquid crystal display panel 3 from behind are provided.

  The diffusing plate 4 is made of a light-transmitting synthetic resin, and is subjected to fine wrinkles (unevenness) or dimming printing so that the light from the light emitting diodes 9 illuminates the liquid crystal display panel 3 uniformly. Note that the diffuser plate 4 may be omitted if satisfactory illumination is obtained.

  The panel retainer 8 is made of a metal material such as aluminum or stainless steel. The panel retainer 8 prevents the liquid crystal display panel 3 and the diffusion plate 4 from being detached from the holder 5 and fixes the holder 5 supporting the liquid crystal display panel 3 and the diffusion plate 4 to the circuit board 6. An edge 7 that covers (suppresses) the periphery of the liquid crystal display panel 3, an enclosure 10 that is provided along the holder 5, and a plurality of legs 11 that are provided on the lower end side of the enclosure 10. Have.

  The circuit board 6 is provided with control means such as a drive circuit and a power supply circuit for driving the liquid crystal display panel 3 (not shown) in addition to the light emitting diode 9 for illuminating the liquid crystal display panel 3 as described above. Further, a through hole 12 is provided at a position corresponding to the foot 11 of the panel retainer 8, and the liquid crystal display panel 3, the holder 5 and the like are formed on the circuit board 6 by inserting and bending the foot 11 into the through hole 12. It is attached and fixed. Reference numeral 13 denotes a cover that covers the back side of the circuit board 6.

  The case molding member 1 includes a surface portion 14, a transparent portion 16 (case body) made of a colorless and transparent synthetic resin having a peripheral wall 15 extending in a substantially orthogonal direction from the periphery of the surface portion 14, and a peripheral wall of the transparent portion 16. The wall portion 17 is made of, for example, black synthetic resin and is integrally formed on the inner surface X side and the front end surface Y side. In addition, six protruding portions 18 are partially provided on the distal end side of the peripheral wall 15, and the protruding portions 18 protrude from the wall portion 17.

  As will be described later, the protrusion 18 is provided to position the see-through portion 16 on the forming die when the case forming member 1 is formed using a forming die. The case forming member 1 in which the deformation (inclination) of the peripheral wall 15 of the see-through portion 16 is suppressed can be obtained by integrally forming the portion 17.

  Next, a method for forming the case forming member 1 will be described with reference to FIGS. 4 and 5. A fluoroscopic part 16 as shown in FIG. 3 is injection-molded in advance. Thereafter, the see-through portion 16 is set on the core die P of the molding die. At that time, the six projecting portions 18 provided in the see-through portion 16 are inserted into the guide holes Q provided in the core die P, and the see-through portion 16 and the core die P are positioned. Next, the core mold P and the mold mold R of the molding die are closed, and black synthetic resin is injected into the molding space S that becomes the wall portion 17. Then, as shown in FIG. 1 or FIG. 2, the case forming member 1 in which the see-through portion 16 and the wall portion 17 are integrated is obtained.

  In this way, the protrusion 18 is provided on the distal end side of the peripheral wall 15 of the see-through portion 16 having the surface portion 14 and the peripheral wall 15, and this protrusion 18 is inserted into the guide hole Q provided in the core die P of the molding die. After positioning the fluoroscopic part 16 and the core mold P, the core mold P and the cavity mold R are closed, and black synthetic resin is injected into the molding space S. Even if the peripheral wall 15 of the portion 16 is slightly distorted, the peripheral wall 15 is integrally formed at the normal position by positioning the protruding portion 18 and the core mold P.

  Even if the synthetic resin is injected in a state where there is a gap between the core mold P and the peripheral wall 15 of the see-through portion 16, the protruding portion 18 provided on the peripheral wall 15 and the core mold P are positioned. Even if the injection pressure at the time of injection molding is applied, the peripheral wall 15 is not deformed (inclined) inward. Therefore, there is no possibility that the see-through portion 16 is cracked or broken, and the case forming member 1 satisfying quality can be formed by a simple method of positioning the see-through portion 16 and the molding die. .

  In the present embodiment, the wall portion 17 is provided on the inner periphery of the surface portion 14 and on the inner surface X side and the front end surface Y side of the peripheral wall 15, but it may be provided at least on the inner surface X side of the peripheral wall 15.

Sectional drawing of the display apparatus to which the case shaping | molding member of this invention is applied. The back view of the case molding member. The partial perspective view which looked at the case body (perspective part) separately from the back side. Sectional drawing of the state which shows the outline metal mold | die structure at the time of shape | molding the case shaping | molding member, and the shaping die is open. Sectional drawing of the state which showed the general mold structure at the time of shape | molding the case shaping | molding member, and closed the shaping die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case shaping | molding member 2 Liquid crystal display 14 Surface part 15 Perimeter wall 16 Transparent part (case main body)
X Inner surface Y End surface 17 Wall 18 Protrusion P Core mold (molding mold)
Q Guide hole R Cavity mold (molding mold)
S Molding space

Claims (2)

  A case molding member molded using a molding die, wherein the case molding member includes a case body having a surface portion and a peripheral wall, and a wall portion integrally formed on at least the inner surface side of the peripheral wall, A case forming member, characterized in that a protruding portion that protrudes from the wall portion on the front end side and that can be positioned by the molding die is provided.   A case molding member comprising: a case main body having a surface portion and a peripheral wall; a wall portion integrally formed on at least an inner surface side of the peripheral wall; and a protruding portion protruding from the wall portion on a distal end side of the peripheral wall. A molding method of a case molding member that is molded using a molding die comprising a mold and a mold, wherein the protruding portion of the case body is inserted into a guide hole provided in the core mold, and the case body and the core A method for molding a case molding member, wherein after positioning the mold, the core mold and the mold are closed and a synthetic resin is injected into a molding space.

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