JP4742341B2 - Manufacturing method of ring-integrated display panel - Google Patents

Description

  The present invention relates to a method for manufacturing a ring-integrated display panel in which an edge feeling or a sharp feeling is provided on a scale provided on a display panel such as an in-vehicle display panel, a mobile phone, or other display panel.

  In recent years, a display panel such as a vehicle-mounted display panel, a mobile phone or the like, or a display panel such as another display tends to be required to have a three-dimensional stereoscopic shape. In particular, in a display panel for vehicles, that is, a display panel used for a meter such as an automobile, the scale is formed of a translucent resin so that light is transmitted from the scale of the display panel by backlighting and shines. To be done.

  As a method conventionally used for forming such a display panel, there is a method described in Patent Document 1. In the method for producing a synthetic resin molded article described in this document, a synthetic resin sheet on which an ink film layer is printed is processed into a shape that can be loaded into a mold, and then loaded so as to be adjacent to the inner surface of the mold. In the method of injection molding the molten resin in the mold after closing the mold, a transparent or semi-transparent molten resin is used, and a light-transmitting window is provided at a predetermined position of the synthetic resin molded product It is characterized by.

  However, according to such a method of combining injection molding with the conventional squeezing process of a synthetic resin sheet, it is difficult to express an edge feeling or a sharp feeling on the scale. In particular, in order to emit a jewel-like shine by back lighting from a three-dimensional convex scale, it is required to give an edge feeling or a sharp feeling to the corner of the scale. Such processing is difficult in the method of combining injection molding with squeezing processing of the synthetic resin sheet.

Therefore, conventionally, when providing a three-dimensional convex scale on the display panel, a method has been adopted in which the display panel and its outer ring and scale are separately formed and then the respective members are joined. For this reason, there are drawbacks in that the production takes time and the cost increases.
JP 2002-178362 A

  The present invention has been made in view of the above circumstances, such as an in-vehicle display panel, a display panel such as a mobile phone, and a three-dimensional convex scale provided on a display panel such as other displays. It is an object of the present invention to provide a method of manufacturing a ring-integrated display panel that can realize a sharp feeling method at a low cost.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a ring-integrated display panel manufacturing method in which a ring-integrated display panel having a ring around a synthetic resin sheet is formed by an injection mold. In the integrated display panel manufacturing method, a ring fixing groove for fixing the ring is formed around a molding surface for imparting a surface shape of the synthetic resin sheet, and the ring fixing groove is fixed to the ring fixing groove. A pin for fixing a sheet protrudes from a required portion of the back surface of the ring, and a positioning recess formed in the periphery of the synthetic resin sheet and cut away toward the outer end of the synthetic resin sheet is formed on the pin. The synthetic resin sheet is fixed to the molding surface in a locked state, and a scale recess is formed on the molding surface according to the shape of the scale protruding from the surface side of the synthetic resin sheet. The opening is formed at a predetermined position of the synthetic resin sheet corresponding to the position where the concave portion for the scale is formed, and the molten resin injected into the back side of the synthetic resin sheet with the mold closed is formed on the synthetic resin sheet. The scale resin is filled into the scale recess through the opening, and the molten resin reaching the peripheral part of the synthetic resin sheet melts the pin to exhibit a wedge effect.

  According to a second aspect of the present invention, there is provided the ring-integrated display panel manufacturing method according to the first aspect, wherein the molten resin is made of a translucent resin.

  According to the method for manufacturing a ring-integrated display panel according to the present invention, the shape of the scale provided on the display panel is not obtained by squeezing the synthetic resin sheet, but from the opening of the synthetic resin sheet in injection molding. Since the filled molten resin is formed in accordance with the shape of the concave portion for the scale, the outer shape of the scale is formed faithfully to the shape of the concave portion for the scale, and the three-dimensional shape of the scale can express an edge feeling and a sharp feeling. It becomes possible.

  In addition, during the injection molding of the method of the present invention, the outer opening-shaped positioning recess formed in the peripheral portion of the synthetic resin sheet is locked to the ring pin fixed in the ring fixing groove around the molding surface Thus, in order to injection-mold the molten resin on the back surface of the synthetic resin sheet, the molten resin injected on the back side of the synthetic resin sheet is filled in the concave portion for the scale through the opening of the synthetic resin sheet, and the synthetic resin sheet Since the molten resin reaching the periphery can melt the pin and exert a wedge effect, the adhesive strength between the ring and the synthetic resin sheet is increased, and the positioning accuracy can be increased by the above-mentioned pin, and the synthetic resin The sheet can be formed in a beautiful state without wrinkles or the like.

  Moreover, although the ring and the synthetic resin sheet are separate bodies, at the time of the above injection molding, since the synthetic resin sheet can be injection-molded by one-shot molding while being locked to the pin of the ring, the display It is possible to obtain a method for producing an edge feeling or a sharp feeling on a scale such as a board at a low cost.

  Embodiments of the present invention will be described below with reference to the drawings.

  The in-vehicle display panel 1 shown in FIG. 1 is formed by the method for manufacturing a ring-integrated display panel according to the present invention. However, the method according to the present invention can also be applied to a display board such as a mobile phone or a display board such as another display.

  The display panel 1 is a ring-integrated display panel 1 having a ring 3 around a synthetic resin sheet 2 and is made of a transparent resin in a circumferential shape along the inside of the ring 3 provided around the synthetic resin sheet 2. Are formed, and a small-diameter hole 2a for inserting a rotation shaft for a meter needle is formed at the center of the display panel 1.

  Further, as shown in FIG. 2, a molding surface 9 having a shape to be imparted to the synthetic resin sheet 2 (see FIG. 4) is formed on the parting surface 7 of the fixed mold 6 in the mold 5 used in this embodiment. A sprue bush 10 is provided at the center of the molding surface 9. The end of the sprue bushing 10 has a protrusion 11 that protrudes from the parting surface 7 toward the cavity 8.

  Further, the fixing mold 6 is formed with a ring fixing groove 12 for fixing the ring 3 (see FIG. 3) around the molding surface 9. As shown in FIG. 9A or 9B, the ring 3 is coupled to the periphery of the synthetic resin sheet 2 forming the surface of the display panel 1, and has a three-dimensional shape with a cross section of, for example, a trapezoid. A groove shape into which the shape of the ring 3 is to be fitted is formed as a ring fixing groove 12.

  As shown in FIG. 9 (a) or (b), a sheet fixing pin 3a protrudes from a required portion on the back surface of the ring 3 fixed to the ring fixing groove 12. This pin 3a is for locking a positioning recess 13 having an outer opening shape formed in advance in the peripheral portion of the synthetic resin sheet 2, and as shown in FIG. 3, from the parting surface 7 of the mold 5 Projects to the movable mold 18 side. The outer opening shape formed in the positioning recess 13 has a shape cut away toward the outer end of the synthetic resin sheet 2. Accordingly, when the positioning recess 13 formed in the synthetic resin sheet 2 is locked to the pin 3a of the ring 3 and the synthetic resin sheet 2 is fixed to the molding surface 9, the synthetic resin sheet 2 moves in the radial direction. However, the movement of the synthetic resin sheet 2 can be absorbed by the shape of the positioning recess 13.

  Further, the molding surface 9 of the fixed mold 6 is formed with a scale concave portion 14 corresponding to the shape of the scale 4 projectingly formed on the surface side of the synthetic resin sheet 2, and the synthesis corresponding to the position where the scale concave portion 14 is formed. An opening 15 is formed at a predetermined position of the resin sheet 2.

  On the other hand, as shown in FIG. 2, the movable die 18 is provided with a submarine gate 16 communicating with the lower end portion of the sprue bushing 10. The submarine gate 16 is connected to a boss 17 provided perpendicular to the cavity 8, and the molten resin becomes a flow path through the boss 17 and into the cavity 8. The movable mold 18 is provided with a Z pin 19 at a position slightly spaced from the lower end of the sprue bush 10.

  In order to carry out the manufacturing method of the ring-integrated display panel of the present embodiment with the structure of the mold 5 described above, the mold 5 is opened as shown in FIG. 2, and in this state, as shown in FIG. A predetermined number of pins 3 a provided on the back side of the ring 3 are movable from the parting surface 7 by fitting a synthetic resin ring 3 formed in advance into the ring fixing groove 12 of the fixed mold 6. It will be in the state which protruded to the metal mold | die 18 side.

  Next, as shown in FIG. 4, the synthetic resin sheet 2 is fixed to the molding surface 9 of the fixed mold 6 by engaging the positioning recesses 13 formed in advance in the synthetic resin sheet 2 with the respective pins 3 a. At this time, a small-diameter hole 5 previously formed in the center of the synthetic resin sheet 2 is fitted to the outer periphery of the protruding portion 11 of the sprue bush 10 protruding from the parting surface 7, and the synthetic resin sheet 2 is fixed in this state. It may be mounted between the mold 6 and the movable mold 18.

  In this state, as shown in FIG. 5, by moving the movable mold 18 and closing the mold to the fixed mold 6, a cavity 8 having a predetermined shape is formed between the fixed mold 6 and the movable mold 18. Is done.

  Next, as shown in FIG. 6, when molten resin such as transparent polycarbonate is supplied from a cylinder of an injection molding machine (not shown), the molten resin flows through the submarine gate 16 from the nozzle (not shown) through the sprue bushing 10. Further, it is injected into the cavity 8 through the boss 17.

  Thus, when molten resin is inject | poured in the cavity 8, the synthetic resin sheet 2 will deform | transform according to the temperature and injection | pouring pressure which a molten resin has, and the shaping according to the molding surface 9 of the fixed metal mold | die 6 will be made. Further, the molten resin injected to the back side of the synthetic resin sheet 2 is filled into the concave portion 14 for the scale through the opening 15 of the synthetic resin sheet 2, and the molten resin reaching the peripheral portion of the synthetic resin sheet 2 is pin 3a. The wedge effect is demonstrated by melting.

  Thereafter, the molten resin in the cavity 8 is cooled and solidified to form the molding resin 20 on the back side of the synthetic resin sheet 2. 7 and FIG. 8, when the parting surface is opened, the synthetic resin molded product (display panel 1) is projected from the movable mold 18 by the unillustrated protruding pin (state of FIG. 8), and the Z pin 19 Thus, the sprue portion 21 and the submarine gate portion 22 are integrally projected from the movable mold 18.

  Then, as shown in FIG. 8, after the synthetic resin molded product (display panel 1) is taken out with the mold 5 opened, the sprue portion 21 and the submarine gate portion 22 attached to the molded product are cut. Let go. In addition, since the boss portion 23 left on the synthetic resin molded product (display panel 1) is unnecessary, it may be cut by post-processing.

  The present invention provides a simple and easy method for producing an edge feeling or sharpness by injection molding on a three-dimensional convex scale provided on a display board such as an in-vehicle display board, a mobile phone, or other display boards. It can be used as a method for manufacturing a ring-integrated display panel that can be realized at low cost.

It is a front view of the vehicle-mounted display board shape | molded by the manufacturing method of the ring integrated display board by this invention. It is sectional drawing (sectional drawing of the position corresponding to the FIG. 1A-A line) of the metal mold | die used for the manufacturing method of the ring integrated display board by this invention. It is sectional drawing which shows the state which fixed the ring to the groove | channel for ring fixation of a fixed metal mold | die in the manufacturing method of the ring integrated display board by this invention. It is sectional drawing which shows the state which fixed the ring to the groove | channel for ring fixation of a fixed metal mold | die in the manufacturing method of the ring integrated display board by this invention. It is sectional drawing which shows the state which fixed the synthetic resin sheet to the molding surface of a fixed metal mold | die in the manufacturing method of the ring integrated display board by this invention. It is sectional drawing which shows the state which closed the metal mold | die in the manufacturing method of the ring integrated display board by this invention. It is sectional drawing which shows the state which opened the metal mold | die after injection molding in the manufacturing method of the ring integrated display board by this invention. It is sectional drawing which shows the state which took out the molded article from the open metal mold | die in the manufacturing method of the ring integrated display board by this invention. (a) is a partially exploded perspective view of a synthetic resin sheet and a ring used in the method for manufacturing a ring-integrated display panel according to the present invention, and (b) is a cross-sectional view showing a state in which the synthetic resin sheet and the ring are combined. It is a figure (sectional drawing equivalent to the BB line of (a)).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display panel 2 Synthetic resin sheet 2a Small diameter hole 3 Ring 3a Pin 4 Scale 5 Mold 6 Fixed mold 7 Parting surface 8 Cavity 9 Molding surface 10 Sprue bush 11 Protrusion part 12 Ring fixing groove 13 Positioning concave part 14 Scale concave part 15 Opening 16 Submarine Gate 17 Boss 18 Movable Mold 19 Z Pin 20 Molding Resin 21 Sprue 22 Submarine Gate 23 Boss

Claims (2)

In a method for manufacturing a ring-integrated display panel having a ring-integrated display panel having a ring around a synthetic resin sheet by an injection mold, the mold is provided around a molding surface for imparting a surface shape of the synthetic resin sheet. A ring fixing groove for fixing the ring is formed, and a sheet fixing pin protrudes from a required portion of the back surface of the ring fixed to the ring fixing groove, and is formed on the periphery of the synthetic resin sheet. Further, the synthetic resin sheet is fixed to the molding surface with the positioning concave portion cut out toward the outer end of the synthetic resin sheet being locked to the pin, while the synthetic resin is fixed to the molding surface. A scale concave portion corresponding to the shape of the scale protruding from the surface side of the sheet is formed, and an opening is formed at a predetermined position of the synthetic resin sheet corresponding to the position where the scale concave portion is formed. The molten resin injected to the back side of the synthetic resin sheet with the mold closed is filled in the concave portion for the scale through the opening of the synthetic resin sheet and reaches the peripheral portion of the synthetic resin sheet A method of manufacturing a ring-integrated display panel, wherein the pin is melted to exhibit a wedge effect. 2. The method for manufacturing a ring-integrated display panel according to claim 1, wherein the molten resin is made of a translucent resin.