Composite and display device using the same

Abstract

To firmly attach a resin molded article onto a surface of a glass substrate without damaging the surface of the glass substrate when integrally molding the resin molded article, which is an engaging portion, with a surface of a glass-made display panel.SOLUTION: A resin molded article 3 is molded in a three stage configuration of a sheet part 31 in contact with a glass substrate 2, a turret-shaped base part 32 provided on an upper surface of the sheet part 31, and a protrusion part 33 which is an engaging portion, provided on an upper surface of the base part 32. By setting a horizontal cross-sectional area of the base part 32 smaller than a horizontal cross-sectional area of the sheet part 31, bonding area with respect to the glass substrate 2 is ensured, thereby bonding strength is heightened. By making the sheet part 31 thinner, the occurrence of sink marks is prevented.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a composite of glass and a resin member used in a display panel of an electronic device such as a car navigation system. [Background technology]

[0002] Display panels for video display devices are made of synthetic resin or glass, but glass panels are often used in high-end devices because the texture of the panel matches the display panel. The display panel is attached to the front frame of the housing that houses the electronic device, and in many cases, the back side of the glass display panel is attached to the front frame using adhesive tape or the like.

[0003] The method of attaching and fixing the display panel to the housing using adhesive tape or the like is cumbersome, requiring the preparation of the adhesive tape required for fixing, adjustments to accurately position the fixing position, etc. Furthermore, if the display panel needs to be replaced due to scratches or damage, it is difficult to replace if the display panel is fixed with adhesive tape or the like.

[0004] Therefore, instead of the above-mentioned fixing method by adhesion, a method is being considered in which a locking portion such as a rib made of a resin material is integrally attached to the back side of a glass display panel by outsert molding, and the locking portion is connected to a locking portion provided on the front frame portion of the housing to attach the display panel to the housing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-159114 Summary of the Invention [Problem to be solved by the invention]

[0006] When a locking portion is provided on the back side of a glass display panel by outsert molding, if the locking portion is thick and wide, there is a problem that the difference in thermal contraction between the glass and the resin causes the locking portion to be insufficiently fixed to the back side of the display panel, making the locking portion prone to peeling off. Furthermore, from the viewpoint of design, it is desirable to fix a display panel to a housing by bending a thin glass substrate when attaching it. In an embodiment in which a locking portion is provided on the back side of a thin glass substrate that can be bent by outsert molding, a new problem was discovered: slight sink marks occur on the front side of the glass substrate due to thermal contraction of the resin used for the locking portion. Furthermore, when fixing a display panel by bending it, the adhesive tape may gradually peel off.

[0007] Conventionally, in order to prevent sink marks from occurring on the back side of the locking portion of a resin molded product, a molding die with a slide core is used, and the locking portion is made into an undercut shape to reduce the volume of the resin and the amount of thermal shrinkage of the resin. However, when the locking portion is made hollow by undercutting, the bonding area between the glass substrate and the locking portion becomes small, making it difficult to obtain sufficient bonding strength. Furthermore, there are problems such as the slide core sliding relative to the glass substrate along the surface of the glass substrate during molding damaging the glass substrate or the printed layer or adhesive layer provided on the glass substrate.

[0008] In view of the problems inherent in conventional technology, the present invention aims to provide a method for firmly attaching a resin molding such as the locking portion to the back side of a glass display panel using a molding die having a slide core, without damaging the surface of the glass substrate with the slide core. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides a composite of glass and a resin member, in which a resin molded body is fixed to one surface of a glass substrate by injection molding, the resin molding has a sheet portion in contact with the glass substrate, a base portion provided on an upper surface of the sheet portion, and a protrusion portion provided on an upper surface of the base portion; In a cross section along the surface of the glass substrate, the area of ​​the base portion is smaller than the area of ​​the sheet portion. The base portion is formed with a hollow portion therein facing the seat portion. It is characterized by:

[0010] In the composite of the present invention, the resin molding disposed on one surface of the glass substrate is provided in a three-stage structure consisting of a sheet portion in contact with the glass substrate, a base portion on the sheet portion, and a protrusion portion corresponding to the locking portion, and as described above, in a cross section along the surface of the glass substrate, that is, in a cross section along the horizontal direction when the glass substrate is placed on a horizontal surface, the cross-sectional area of ​​the base portion is set smaller than the cross-sectional area of ​​the sheet portion. The base portion is formed with a hollow portion therein facing the seat portion. Since the horizontal cross-sectional area of ​​the sheet portion is larger than the horizontal cross-sectional area of ​​the base portion above it, the bonding area with respect to the glass substrate is secured and the sheet portion, which is the part that is bonded to the glass substrate, can be formed thin, thereby preventing the resin molded body from peeling off from the glass substrate or the occurrence of sink marks on the glass substrate due to the difference in thermal shrinkage between the resin molded body and the glass substrate.

[0011] In the composite of the above configuration, the resin molding disposed on one side of the glass substrate is such that, in a cross section along the surface of the glass substrate, the area of ​​the portion of the base joined to the sheet portion is larger than the area of ​​the upper surface portion of the base portion where the protrusions are provided. Reduce the area It can be set and formed. According to this, the protrusion, which needs to be formed to a certain thickness in order to form the locking portion, is formed on the upper surface of the base portion provided on the seat portion, and the horizontal cross-sectional area of ​​the portion of the base portion joined to the seat portion is made larger than the portion where the protrusion is joined. Smaller Set and resin composition The shape is glassSince the glass substrate is formed so that the thickness is greater at a position (the position of the protrusion) slightly above the surface of the glass substrate via the base, it is possible to effectively prevent sink marks from occurring in the glass substrate due to thermal shrinkage of the protrusions. When a thick resin molded body is bonded to the surface of the glass substrate, the resin molded body, especially the protrusions, undergo significant thermal shrinkage, which tends to cause sink marks in the glass substrate, but the above-mentioned configuration makes it less likely for sink marks to occur.

[0012] As shown in Figure 6, a composite of the above configuration can be formed by injection molding a resin molded body onto the surface of a glass substrate using a cavity (fixed mold) and a core (movable mold) having a slide core, and it is preferable that the base portion, which has a smaller horizontal cross-sectional area than the sheet portion, is provided in a thin shape with undercuts that are connected in a tower-like shape on the sheet portion. In this case, the hollow tower-shaped base portion is arranged on the sheet portion, and therefore, during molding, the slide core slides relatively along the surface of the sheet portion, not along the surface of the substrate, as shown in the same figure (B). Therefore, there is no risk of the slide core coming into contact with the glass substrate and damaging the surface of the glass substrate, or damaging the printed layer or adhesive layer provided on the glass substrate. The base has a turret shape to reduce the contact area between the sheet and the protrusions, preventing the thermal contraction of the protrusions from affecting the sheet. The horizontal cross-sectional shape of the base in the embodiment described below is U-shaped, but it may also be a through-hole shape or a V-shape.

[0013] The composite of the present invention can be constructed by using a glass substrate formed by partially laminating a printed layer and an adhesive layer on the surface of a transparent glass plate, and by placing a resin molded body on the surface of this adhesive layer. As will be described later, when the composite of the present invention is a display panel for car navigation, the glass substrate can be formed by forming a black print layer in a strip shape along the four peripheral sides of a glass plate that is rectangular in plan view on the back side of the glass plate, and laminating an adhesive layer on the surface of this print layer.

[0014] The ink for forming the printing layer may be any ink that can be printed directly onto a glass plate. Use From the viewpoint of adhesion to glass, it is preferable to add a silane coupling agent. The ink contains a black colorant such as carbon black, and the printed layer forms a black colored portion on the surface of the glass plate.

[0015] The adhesive layer may be any adhesive that can bond the printed layer to the resin molded body to be outsert molded. Commercially available binder inks and adhesion enhancers for use in injection molding can be used.

[0016] The glass substrate having a printed layer and an adhesive layer laminated on one side of the glass plate preferably has a thickness of 0.2 mm or more and 2.0 mm or less, and more preferably 0.5 mm or less when used to curve and fix glass. A thickness of 0.5 mm or less is preferable because the glass substrate can be curved and installed in a housing, and a thickness of 0.2 mm or more is preferable because the glass substrate is less likely to break even when curved.

[0017] The resin molding disposed on one surface of the glass substrate preferably has a sheet thickness of 0.3 mm to 1.5 mm, and the base thickness can also be set to 0.3 mm to 1.5 mm. If the thickness is 0.3 mm or more, the resin can be injected uniformly between the glass substrate and the slide core provided in the core (movable mold), and the surface of the glass substrate and the base portion can be firmly joined. If the thickness is 1.5 mm or less, the resin volume of the sheet portion can be reduced, and the amount of shrinkage of the resin member can be reduced, thereby preventing sink marks on the surface side of the glass substrate. The thickness is preferably 1.2 mm or less, and more preferably 1.0 mm or less. The base portion is disposed on the sheet portion at a position closer to one longitudinal side thereof so that the slide core, which undercuts the base portion during outsert molding, slides on the sheet portion. The sheet portion is preferably formed to have a length at least equal to or greater than the length (width) of the base portion. When the slide core is removed from the glass panel outward, the resin is injected with a portion of the slide core protruding outward from the glass panel when viewed from above. Therefore, the length of the sheet portion can be set to be approximately equal to that of the base portion, but it is preferable that the length be at least equal to that of the base portion. The protrusion of the resin molded body is a part that protrudes upward from the base and constitutes the locking part as described above, and when the composite of the present invention is used as a display panel, for example, the protrusion is coupled to the locking part on the side of the display device to which the display panel is attached, thereby fixing the display panel to the display device. The protrusion is formed in a shape that corresponds to the locking part, such as a boss or rib, that engages or fits into the locking part. The structure allows the protrusion and the locked portion to engage and fit together, making it possible to engage and fit even when the glass is curved.

[0018] The resin molded body is preferably made of a resin with low heat shrinkage, and can be formed using, for example, a polystyrene-based resin, a polybutylene-based resin, or a polycarbonate-based resin. To minimize shrinkage during molding, it is preferable that the resin contains an appropriate amount of glass fiber, for example, about 30% by mass of the entire material. If a polycarbonate resin containing glass fiber is used as the material, the shrinkage of the resin molded body can be reduced, and sink marks are less likely to occur.

[0019] The composite of the present invention can be used in display panels for devices that display various types of information. Examples of display devices include in-vehicle devices such as car navigation systems, and other electronic devices equipped with panel displays such as liquid crystal displays and organic EL displays. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram showing both the front and back surfaces of an embodiment of a display panel that is a composite of the present invention, in which the front and back surfaces are separated. [Figure 2] 2 is an enlarged cutaway perspective view of a portion of the display panel of FIG. 1 where a resin molded body is disposed. [Figure 3] 2 is a top view of the resin molded body of the display panel of FIG. 1. FIG. [Figure 4] 2 is an enlarged cross-sectional view of a portion of the display panel of FIG. 1 where a resin molded body is disposed. [Figure 5] 10(A), (B) and (C) are diagrams showing other forms of the base portion. [Figure 6] 1A and 1B are diagrams showing the configuration of a molding die for a resin molded body of a display panel. DETAILED DESCRIPTION OF THE INVENTION

[0021] The composite of the present invention will be described below based on embodiments. However, the embodiments shown below are merely examples for embodying the technical concept of the present invention, and the present invention is not limited to the forms described below.

[0022] Figures 1 to 4 show an embodiment in which the composite of the present invention is applied to a display panel for car navigation. The display panel 1 is constructed by arranging multiple resin moldings 3 integrally on the back side of a horizontally elongated rectangular glass substrate 2.

[0023] The glass substrate 2 is formed with a thickness of about 0.5 mm overall, with black colored portions 22 provided in strips along the four peripheral sides of the rear surface of a transparent, horizontally elongated rectangular glass plate 21.

[0024] The colored portion 22 is formed by laminating an adhesive layer 22b on a printed layer 22a provided on the rear surface side of the glass plate 21 (see FIG. 4).

[0025] In detail, the colored portion 22 is formed by applying an ink made of an acrylic urethane resin containing a black colorant and a silane coupling agent in a frame shape along the periphery of the back side of the glass plate 21 to form a printed layer 22a, and after the printed layer 22a has dried, applying a two-component curing polyurethane ink to its surface, drying it, and laminating an adhesive layer 22b on the top surface of the printed layer 22a.

[0026] As shown in FIG. 1, the resin moldings 3 are attached integrally to the four corners of the glass substrate 2 on the upper surface of the colored portions 22 formed on the rear surface of the glass substrate 2 .

[0027] In detail, the resin molding 3 is made of polycarbonate resin containing glass fiber and is attached integrally to the back side of the glass substrate 21 by outsert molding. As shown in Figures 2 and 3, a base portion 32 is connected to the upper surface of a thin sheet portion 31 joined to the surface of the colored portion 22, and a protrusion portion 33 is integrally formed on the upper surface of this base portion 32.

[0028] The seat portion 31 has a rectangular band shape in a plan view, and a base portion 32 is provided at a position offset to one side of the upper surface of the seat portion 31. The base portion 32 is formed in a tower shape with its interior undercut, and a cylindrical boss 33 is provided in the center of the upper surface. The base portion 32 is formed with a hollow portion therein facing the seat portion 31 . More specifically, the base portion 32, which is the connecting portion between the sheet portion 31 and the protrusion portion 33, is configured so that the cross-sectional area of ​​the base portion 32 is smaller than the cross-sectional area of ​​the sheet portion 31 in a cross section along the surface of the glass substrate 2, and so that the cross-sectional area of ​​the portion joined to the sheet portion 31 is smaller than the cross-sectional area of ​​the upper surface from which the protrusion portion 33 protrudes. Each of these parts is formed to a thickness of 0.3 mm or more and 1.5 mm or less. The base part 32 is formed to have a length (width) that is half or less the length of the sheet part 31.

[0029] The display panel 1 has a colored portion 22 formed by laminating a printed layer 22a and an adhesive layer 22b on the rear surface of a glass plate 21. Glass substrate 2 The glass substrate 2 is formed, and a molding die having a slide core on the back side is attached to the glass substrate 2, molten resin is injected into the cavity and solidified to form the resin molding 3, and the molding die is then slid away from the glass substrate 2 to produce the resin molding 3. Furthermore, the slide core that undercuts the base portion 32 slides relatively along the surface of the sheet portion 31 and does not come into contact with the surface of the glass substrate 2, so that the glass substrate 2 is not damaged.

[0030] The display panel 1 manufactured as described above is attached by connecting the protrusion 33 of the resin molding 3 provided on the back side of the glass substrate 2 to the connecting portion provided on the front frame portion of the housing of the car navigation system that houses the electronic devices, thereby forming the display surface of the car navigation system.

[0031] According to the display panel 1 of this embodiment, the resin molding 3 arranged on the rear surface side of the glass substrate 2 has a three-stage structure consisting of a sheet portion 31 in contact with the glass substrate 2, a base portion 32 thereon, and a protrusion portion 33. In a cross section along the surface of the glass substrate 2, the cross-sectional area of ​​the sheet portion 31 is larger than the cross-sectional area of ​​the base portion 32 thereon. This ensures a bonding area with respect to the glass substrate 2, and allows the sheet portion 31 to be formed thin. Can, Ga The bonding strength of the resin molding 3 to the glass substrate 2 is increased, making it difficult for the resin molding 3 to peel off from the glass substrate 2. Furthermore, since the protrusions 33, which must be formed to a certain thickness in order to form the locking portions, are formed on the upper surface of the base portion 32, sink marks may occur on the glass substrate 2 due to the difference in thermal contraction between the glass substrate 2 and the resin molding 3. occurs This can be effectively suppressed.

[0032] In the above embodiment, the horizontal cross-sectional shape of the base portion 32 is U-shaped, but if the connection area between the sheet portion 31 and the protrusion portion 33 can be reduced to suppress the effect of thermal contraction of the protrusion portion 33 on the sheet portion 31, the horizontal cross-sectional shape can be made to be any other appropriate shape, such as a V-shaped shape in a plan view as shown in Figure 5 (Figure 5(A)), a comb-tooth shape (Figure 5(B)), or a through-hole shape (Figure 5(C)). In the above embodiment, the composite of the present invention is applied to the display panel of a car navigation system, but it can also be applied to the display panel of other information display devices. In this case, the display panel is formed to a size corresponding to the display device, and an appropriate number of resin molded bodies are provided on the back surface of the glass substrate at appropriate positions on the back surface of the glass substrate according to the size of the display device. The shapes and combinations of the glass substrate and resin molded body that constitute the composite of the present invention are merely examples, and various modifications can be made based on design requirements and the like within the scope of the present invention. [Explanation of symbols]

[0033] 1 composite (face panel), 2 glass substrate, 21 glass plate, 22 colored portion, 22a printed layer, 22b adhesive layer, 3 resin molded body, 31 sheet portion, 32 base portion, 33 protrusion portion

Claims

1. A composite of glass and a resin member in which a resin molded body is fixed to one surface of a glass substrate by injection molding, the resin molding has a sheet portion in contact with the glass substrate, a base portion provided on an upper surface of the sheet portion, and a protrusion portion provided on an upper surface of the base portion; A composite, characterized in that, in a cross section along the surface of the glass substrate, the area of ​​the base portion is smaller than the area of ​​the sheet portion, and the base portion is formed having a hollow portion therein facing the sheet portion.

2. 2. The composite according to claim 1, wherein in a cross section along the surface of the glass substrate, the area of ​​the portion of the base portion bonded to the sheet portion is smaller than the area of ​​the upper surface portion of the base portion on which the protrusion portion is provided.

3. 3. The composite body according to claim 1, wherein the base portion is formed in a tower shape.

4. 4. The composite according to claim 1, wherein the glass substrate is formed by partially laminating a printed layer and an adhesive layer on the surface of a transparent glass plate, and a resin molded body is disposed on the surface of the adhesive layer.

5. 5. The composite according to claim 1, wherein the glass substrate has a thickness of 0.5 mm or less.

6. 6. The composite according to claim 1, wherein the thickness of the sheet portion is 0.3 mm or more and 1.5 mm or less.

7. 7. The composite according to claim 1, wherein the resin molding is made of a polycarbonate resin containing glass fibers.

8. A display device using the composite according to any one of claims 1 to 7 as a display panel.

9. A car navigation system using the composite of any one of claims 1 to 7 as a display panel.

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