CN1722155B - Display panel, control display panel and method for integrally molding insert material - Google Patents

Abstract

The invention discloses a display panel suitable for being installed on an electronic device, which comprises a first printed display layer, a transparent material layer provided on the first printed display layer, and a transparent material layer provided on the transparent material layer corresponding to the first A second printed display layer of the printed display layer. The first printed display layer, the transparent material layer and the second printed display layer are integrally formed with each other. The second printed display layer is displayed through the layer of transparent material from the side of the first printed display layer.

Description

Display panel, control type display panel and method for integral molding embedded material

technical field

The present invention relates to a display panel, a control type display panel and an insert molding method for integrally molding an insert material such as a board.

Background technique

Recently, display panels integrally molded with films and resin materials are widely used in display portions of electronic devices ranging from home electric devices such as microwave ovens and rice cookers to communication devices such as mobile phones. Some panels are equipped with a switching function part called a membrane switch (sheet switch).

In order to simplify the operation procedure of the electronic device, the display panel is required to have a simple structure. However, with the multi-functional trend in electronic devices, simpler structures lead to more complex operations. On the contrary, when various switches such as a menu key and a setting key are provided in the display panel in order to simplify operations, the structure of the display panel itself becomes complicated, which leads to high cost. Therefore, in order to use a display panel with a simple structure and simplify its operation, a configuration having a two-layer structure in a display area of the display panel has been used to improve display efficiency within a limited display/operation area.

In order to form the display area of the display panel into a double-layer structure, a method is available in which a printed layer (foil) is formed by an in-molding method on the front and rear surfaces of a panel base such as a transparent resin having translucency. ). In this way, by forming the display area of the display panel into a double-layer structure, the density of information to be displayed is increased and a user-friendly display panel is obtained.

As a method for simultaneously integrally molding a printing plate, there is known an insert molding method in which a printing plate printed in advance on a front surface is placed in a mold, and then, a resin material is injected into the mold and pressurized; Thereby, the printing plate and the resin material are integrally molded (for example, JP-A-6-209849). Insert molding as described above includes a front embedding method and a rear embedding method in which the former arranges a printing plate on a front side surface of a molded article, and the latter arranges a printing plate on a rear side surface of a molded article having translucency.

However, in the process of adhering the above-mentioned front printed board and rear printed board to the panel base of transparent resin or the like using adhesive, double-sided tape, etc., the gap between the rear printed board and the panel base can be seen from the front side. Adhesive surfaces, which lead to undesirable appearance conditions. Simultaneously, the display panel is illuminated from the rear side by a light source such as LED, and occasionally, uneven display and/or incorrect display due to light leakage can be seen from the front side surface of the display panel. This is caused by the fact that if there is any gap between the rear printed board and the panel base, then light can easily leak from there. In order to prevent uneven display or incorrect display, both sides above need to be bonded seamlessly and reliably; and when bonding them, uneven bonding and inclusion of dust need to be avoided.

As a method of bonding the panel base and the printed board with highly intimate contact, insert molding can be utilized. However, when the above-mentioned display panel is formed by insert molding, problems arise in either of the front embedding method and the rear embedding method.

FIG. 36A shows a switch part of a display panel, which is formed by the front insert method. Fig. 36B is a schematic sectional view showing a display portion of the same display panel. In this front embedding method, light from the light source 4 on the illuminated (on state) side passes through the transparent portion 3a of the printed board 3A arranged on the front side surface of the display panel 1A. However, since the thickness of the panel base 6 reaches the optical path length up to the transparent portion 3a, part of the light from the light source 4 reaches the adjacent transparent portion 3b. Light leakage occurs because the transparent portion 3b allows light from the light source 5 located on the non-illumination side (off state) of FIG. 36B to pass therethrough. That is, the transparent portion 3b that should not be illuminated is illuminated. As a result, mixing and display of light from adjacent light sources results in unsatisfactory visibility for the display panel.

On the other hand, FIG. 37A shows a switch part of a display panel molded by the rear insert method. Fig. 37B is a schematic sectional view showing a display portion of the same display panel. In this rear embedding method, a printed board 3B is arranged on the rear surface of the display panel 1B. Therefore, since the printed portion is arranged next to the light source, light leakage is eliminated. In this way, even when the light sources are arranged close to each other, light can be displayed without light mixing. However, on the other hand, when the switch pressing member 8 is pressed repeatedly to switch on/off the switch 7, since the pressing direction is consistent with the direction of peeling the printed board 3B from the panel base 6, the peeling of the printed board 3B is accelerated.

In addition, when the display panel 1B is viewed from the "V" direction in FIG. 37B, since the panel base 3 is transparent, the bonding unit 9 (including ribs, ribs, hooks, screw holes, etc.), causing appearance problems.

Therefore, a display panel having a printed board of a double-layer structure has now been proposed. That is, on the front side surface of the structure formed by the above-mentioned front embedding method, another layer, ie, the transparent material 10 applied on the front surface thereof along with the printing plate 3D, is superimposed. 38A and 38B show examples of the display panel of the two-layer structure. Due to this structure, the holding unit 9 is hidden by the printed area of the printed board 3C; thus, problems in appearance can be eliminated. By arranging so that the switching operation is performed through the outermost printed board 3D; this also solves the peeling problem. However, in order to bond the transparent material 10 to the printed board 3D and the panel base 6 to the printed board 3C, a total of two injection molding processes are required. Furthermore, another step of connecting the shaped sheets to each other is required, which complicates the manufacturing process. In addition, the performance of ink or the like needs to be able to withstand high temperatures for a long period of time. Therefore, this method is difficult to put into practical use. In addition, as in the front embedding method, as shown in FIG. 36B , in this method, the problem of light leakage is not eliminated due to the thickness of the panel base 6 .

Furthermore, as an example of the insert molding method, there is known an insert molding method in which connectors fix resin channels (for example, refer to JP-B-5-065329 (pages 2-3 and FIG. 1 )).

In the insert molding method disclosed in JP-B-5-065329, the injection port communicating with the cavity is arranged in the central area of the lower mold, and at the periphery of the injection port, a connecting piece communicating with the cavity is embedded such that It extends and retracts. The injection port is supported on the first injection plate and communicated with the screw extrusion molding machine. The connector protrudes from the second spray plate disposed on the first spray plate and is supported by the pin. The connecting piece is located on one side of the cavity and is provided with a flange fitted into an annular groove formed in a peripheral portion of the injection port. The second ejection plate is equipped with a reset pin passing through the lower die, and retracts the second ejection plate by engaging with the upper die, and when the connecting piece is lowered, the flange engages with the inner side of the annular groove.

In the insert molding method according to JP-B-5-065329, the connecting member is fixed to the resin channel, and the insert material is also fixed to the connecting member. Accordingly, the resin supplied to the inside of the cavity flows between the embedding materials, and the embedding materials are molded into the structure of the mold by injection pressure or extrusion pressure including the injection pressure. At the same time, the materials are combined into a sandwich form in between, thereby completing the molding.

However, the insert molding method according to JP-B-5-065329 has the following problems. That is, although the front and rear surfaces of the molded product are covered with the insert material, the insert material occasionally peels off in the state where the resin material and the insert material are integrally molded in the molded product; or the resin material occasionally separates between the mold and the insert during molding. flow between materials. The embedding material is occasionally twisted in the molding die due to the force of the flowing resin material; therefore, it is difficult to stably mold the desired structure.

Contents of the invention

The present invention has been made in consideration of the above-mentioned problems. A first object of the present invention is to provide a display panel and a control type display panel equipped therewith, which are simple in structure, can simplify operations and have high durability without causing any appearance problems.

Furthermore, a second object of the present invention is to provide an insert molding method capable of stably forming a desired structure by reliably integrally molding a plate.

The above purpose can be achieved by the following structure.

A display panel adapted to be mounted on an electronic device, comprising:

a first printed display layer;

a layer of transparent material provided on the first printed display layer; and

a second printed display layer provided on the layer of transparent material such that it corresponds to the first printed display layer,

wherein the first printed display layer, the layer of transparent material and the second printed display layer are integrally formed with one another; and

Wherein the second printing display layer is displayed through the transparent material layer from the side of the first printing display layer.

According to the display panel, a display with depth and translucency can be obtained with a simple structure in which the second printed display layer is displayed from the first printed display layer through the transparent material layer.

Preferably, the first printed display layer is a first printed plate comprising a translucent substrate and a first printed area formed on the substrate.

According to the display panel, by using the first printed display layer as the first printed board, the durability of the printed display layer can be increased by the board material.

Preferably, the second printed display layer is a second printed plate comprising a translucent substrate and a second printed area formed on the substrate.

According to the display panel, by using the second printed display layer as the second printed board, the durability of the printed display layer can be increased by the board material.

Preferably, the first printed display layer is a first printed plate comprising a translucent substrate and a first printed area formed on the substrate. The second printed display layer is a second printed plate that includes a translucent substrate and a second printed area formed on the substrate. The transparent material layer has a first through hole. The second printed board has a second through hole communicating with the first through hole. The first printed board has a single board layer in an area corresponding to the first through hole.

According to the display panel, at the position of the through hole, by forming the first printed board of a single board layer, the first printed board can function as a switch operation portion operated by pressing. Furthermore, the first printing plate does not peel off from the transparent material layer due to this pressing operation.

Preferably, single ply regions in the first panel are embossed.

According to this display panel, by processing a single sheet layer area as embossment, a state in which the sheet is partially raised outward can be obtained, and the portion processed as embossment appears to be floating in a three-dimensional space. Thereby, the design performance of the display panel is increased and the part processed as embossment is easy to be visually recognized.

Preferably, at least a part of the first printing area is printed with a medium having light diffusing properties.

According to the display panel, since the printed area of the medium diffuses and transmits the irradiated light, only the printed area thereof is illuminated; visibility can be increased.

Preferably, at least a part of the second printing area is printed with a medium having light diffusing properties.

According to the display panel, the medium printed area diffuses and transmits the irradiated light. Therefore, only its printed area is illuminated, increasing visibility. In addition, the rear side is prevented from being seen from the front surface side of the display panel.

Preferably, a bonding portion for fixing the display panel is formed on a periphery of the transparent material layer. The first printing area of the first printing plate has an opaque area arranged corresponding to the joint portion.

According to this display panel, by arranging the first printed area at a position opposite to the joint portion, the joint portion cannot be seen from the display side of the display panel. In this way, there is no problem with appearance.

Preferably, the first printed display layer is a first printed plate comprising a translucent substrate and a first printed area formed on the substrate. The second printed display layer is a second printed plate comprising a translucent substrate and a second printed area formed on the substrate. A bent portion in which an end portion of at least one of the first printed board and the second printed board extends from a surface of the transparent material layer to a side end surface of the transparent material layer is formed on at least a part of the outer periphery of the transparent material layer. .

According to the display panel, a bent portion in which the printed board is bent toward the side end surface of the transparent material layer is formed. Thereby, in an insert molding process where it is difficult to achieve accurate alignment between the plate end and the end of the transparent material layer, it is possible to prevent the plate from protruding from the end of the transparent material layer, and to eliminate cutting processing in the case of the plate protruding.

Preferably, the first printed display layer is a first printed plate comprising a translucent substrate and a first printed area formed on the substrate. The second printed display layer is a second printed plate comprising a translucent substrate and a second printed area formed on the substrate. A rib portion is provided on the periphery of the transparent material layer so as to protrude toward the second printed board side. The surface of the rib portion is connected to the surface of the transparent material layer. A bent portion in which an end portion of at least one of the first printed board and the second printed board extends from the surface of the transparent material layer to a side end surface of the transparent material layer is formed at least on the surface of the rib portion.

According to the display panel, by extending the printed board toward the front surface of the rib to provide the curved portion, alignment accuracy for arranging the board to the mold can be eased. Therefore, productivity is increased and production cost is reduced.

Preferably, the first printed display layer is a first printed plate comprising a translucent substrate and a first printed area formed on the substrate. The second printed display layer is a second printed plate comprising a translucent substrate and a second printed area formed on the substrate. Protruding portions are provided on the transparent material layer. An opening portion is formed on at least one of the first printed board and the second printed board such that the protruding portion is exposed from the opening portion. A bent portion in which an end portion of the periphery of the opening portion of at least one of the first printed board and the second printed board extends along a side surface of the transparent material layer convex portion is formed on a periphery of the transparent material layer convex portion.

According to the display panel, by extending the printed board to the periphery of the convex portion, the end portion of the printed board can be easily handled.

According to the present invention, a control type display panel is also provided, comprising:

display panel;

switch pressing parts arranged in the first and second through holes; and

A switch unit that performs a switch operation by receiving an operation in which the switch pressing member is pressed by a single layer of the first printed board.

According to this control type display panel, the switch operation is performed by pressing the switch pressing member through the printed board layer.

Preferably, the first printing area of the first printing plate has opaque areas.

According to the control type display panel, by forming the opaque printed area, it is possible to realize a state in which the single sheet layer is floating in a three-dimensional space. Thereby, visibility is improved and operability is also increased.

According to the present invention, a control type display panel is also provided, comprising:

display panel, and

a light source arranged on the second printed board side of the display panel,

wherein a second printing area is formed on the second printing plate to correspond to an irradiation position of the light source; and

Wherein the second printing plate comprises an area treated with a medium having light diffusing properties.

According to the control type display panel, by selectively irradiating light from the light source to a specific area of the second medium printing plate, the irradiated area is illuminated; thereby, a display with high visibility can be obtained. Furthermore, the part of the returned light that has passed through the display panel is not reflected or returned to the display side. Therefore, each media printing area to be selectively displayed can be arranged in a narrow area. Thereby, higher-density display can be realized, thereby improving operability.

Due to the display panel according to the present invention, it is possible to obtain a display panel which is simple in structure, easy to handle and has high durability without causing any appearance problems; control display panel.

In addition, according to the present invention, there is also provided a mosaic molding method, including:

providing an upper mold, and a lower mold arranged relative to the upper mold;

providing a plate component disposed in the cavity formed by the upper mold and the lower mold; and

spraying resin material onto the portion of the plate extending from the cavity such that the interior of the cavity is filled with the resin material to form a molded article bonded to the plate

Preferably, a gate for injecting the resin material is formed above the extended portion of the plate.

Preferably, the insert molding method further includes a cutting process for cutting a part of the molded article with the extension.

According to this insert molding method, a gate for filling a resin material is formed over a portion of the plate extending from the cavity. Therefore, since the molding is completed while pressing the board with the gate, the board is integrally molded while being securely placed without peeling or bending. In this way, the plate can be stably shaped into the desired configuration.

Preferably, the width of the plate extension is greater than the diameter of the gate.

According to the insert molding method, since the width of the plate extension is formed wider than that of the gate, it is possible to uniformly and stably withstand the pressure applied by the gate.

Preferably, the gate is arranged substantially at the center of the extension portion as viewed from a direction in which the resin component is ejected from the gate.

According to this insert molding method, the pressure applied by the gate can be applied to the plate extension extending to both sides of the gate. Therefore, even when the temperature of the filling resin material is high, the accuracy of plate positioning can be improved.

Preferably, the plates are arranged on both sides within the cavity.

According to the insert molding method, by arranging the plates on both sides inside the cavity, double-sided insert molding can be realized in which the two plates arranged on both sides of the cavity are reliably integrally molded.

Preferably, the molded article is a control type display panel having a switch unit.

According to the insert molding method, when the molded product is used for a control panel having switches, since the board is reliably integrally molded, it is possible to form a control panel molded into a stable structure.

According to the insert molding method of the present invention, problems such as peeling or bending of the board, and difficulty in stably molding the board into a desired structure can be eliminated. In this way, since the board can be reliably integrally formed, an effect is obtained in which the board can be stably formed into a desired structure.

Description of drawings

By describing in detail the preferred embodiments of the present invention in conjunction with the accompanying drawings, the above objects and advantages of the present invention will become clearer, in these drawings:

1 is a cross-sectional view schematically showing the structure of a display panel according to the present invention, which is used to illustrate the characteristics of the display panel;

Fig. 2 is a front view of a microwave oven with a display panel installed;

Fig. 3 is an exploded perspective view showing the assembly of the display panel on the opening/closing door;

4 is an external perspective view of the display panel;

Figures 5A and 5B represent a front panel and a rear panel for the display panel in Figure 4;

Figure 6 is a perspective view of the rear panel;

Fig. 7 is a sectional view showing a display panel and an opening/closing door along VII-VII in Fig. 6;

8A and 8B are views showing a display panel and display states of "output" and "temperature" on its rear plate on which a medium is printed;

9A and 9B show display states of the lamp display portion;

10A, 10B and 10C represent the molding process of the display panel;

11 is a cross-sectional view of a display panel;

Figures 12A and 12B are end arrangements of the front and rear plates in an enlarged portion of part B shown in Figure 11;

Figure 13 is an enlarged sectional view of part C shown in Figure 11;

Fig. 14 shows the installation position part of the knob in the display panel;

15 is a cross-sectional view schematically showing a recess formed in a display panel;

16 is a partial sectional view schematically showing a rear panel equipped with a display panel and a light source;

17 is an external perspective view of a display panel showing a modification of the display panel;

Fig. 18 is a sectional view of a display panel showing another variation of the display panel;

19 is a cross-sectional view showing an insert molding method according to a second embodiment of the present invention;

20A is a sectional view of the first step of the insert molding method shown in FIG. 19; FIG. 20B is a sectional view of the second step of the insert molding method shown in FIG. 19; FIG. 20C is a sectional view of the third step of the insert molding method shown in FIG. Cross-sectional view; FIG. 20D is a cross-sectional view of the fourth step of the mosaic molding method shown in FIG. 19; FIG. 20E is a cross-sectional view of the fifth step of the mosaic molding method shown in FIG. 19;

Fig. 21 is a schematic diagram of the door and the periphery thereof in the insert molding method shown in Fig. 19;

Fig. 22 is an external view of the door and its periphery for molding the first half in the insert molding method shown in Fig. 19;

Fig. 23 is an external view of the door and its periphery for the second half of molding in the insert molding method shown in Fig. 19;

24 is a sectional view illustrating an insert molding method according to a third embodiment of the present invention;

Fig. 25 illustrates the state in the first half of molding in the insert molding method shown in Fig. 24;

FIG. 26 illustrates the state in the second half of molding in the insert molding method shown in FIG. 24;

Fig. 27 is a cross-sectional view of the molded article formed by insert molding shown in Fig. 24;

Figure 28 is an external perspective view of a portion of an acceptable product formed according to the insert molding method shown in Figure 24;

29 is an external perspective view of a portion of a defective product formed by the insert molding method shown in FIG. 24;

Fig. 30 is a perspective view of the inside of the mold omitting the upper mold in the insert molding method shown in Fig. 24;

Fig. 31 is a cross-sectional view illustrating board mounting in the insert molding method shown in Fig. 24;

Fig. 32 is a partially enlarged cross-sectional view of a plate in the insert molding method described in Fig. 24;

Fig. 33 is an assembly view of a molded product formed according to the insert molding method shown in Fig. 24;

Fig. 34 is an external view showing a modification of the plate in the insert molding method shown in Fig. 24;

Figure 35 is an external view showing a variant of the plate different from that shown in Figure 34;

36A and 36B represent schematic cross-sectional views of a switch part and a display portion of a display panel molded by a conventional front embedding method;

37A and 37B represent schematic cross-sectional views of a switch component and a display portion of a display panel formed by a conventional rear embedding method; and

38A and 38B show schematic cross-sectional views of an example of a display panel of a conventional two-layer structure.

Detailed ways

Below, preferred embodiments of the display panel and the control display panel according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view illustrating the structure of a display panel according to a first embodiment of the present invention;

The display panel 100 is installed on an electronic device. The display panel 100 mainly includes: a panel base 11 formed of a transparent material (for example, transparent resin), and a printing plate 13 (referred to as a front plate) adhered on the front side surface of the panel base 11 as a first printed display layer. And a printing plate 15 (referred to as a rear plate) as a second printed display layer adhered on the rear side surface of the panel base 11. The display panel 100 is an inlay molding product in which a front plate 13 and a rear plate 15 are integrally formed, facing each other with a panel base 11 sandwiched therebetween.

The front plate 13 is a plate having a transparent property, which is printed on a part of the translucent base, and integrally formed with the printed layer 17 arranged on the front surface at the side of the panel base 11 . On the other hand, the rear plate 15 is printed in color and has an opaque property integrally formed with the printed layer 19 arranged on the front surface of the panel base 11 side.

The panel base 11 is formed of a transparent material such as ABS resin, polycarbonate resin, or acrylic resin. The front plate 13 and the rear plate 15 are formed by using a plate such as PET (polyethylene terephthalate) resin having a thickness of about 0.05 to 0.3 mm.

The printed layer 19 of the rear plate 15 is arranged to be visible from the front plate 13 side through the panel base 11 . According to the display panel 100 as this embodiment, the rear plate 15 is observed through the transparent panel base 11 and the front plate 13 . Thus, a display with a quality sense of depth and translucency is given, wherein the printed layer 17 of the front plate 13 is arranged on the front side and the printed layer 19 of the back plate 15 is arranged on the rear side. When the thickness of the panel base 11 is 1 mm or more, the translucent appearance quality can be further improved. That is, images on the printing layer 17 , such as characters and/or images provided to the front panel 13 , are reflected on the rear panel 15 through the panel substrate 11 . Thereby, since these characters and images are three-dimensionally expressed, the characters and images become eye-catching, and design performance is also improved. In this way, depth and translucency are further improved. Furthermore, due to the integral formation, the degree of bonding in the front plate 13, the rear plate 15, and the panel base 11 is increased; thus, light can pass through uniformly. In this way, a display with stable quality and translucent aesthetic quality can be obtained.

A through hole 21 is formed in a part of the panel base 11 and the rear plate 15 , which passes through the panel base 11 and the rear plate 15 at the same position. The front board 13 is formed as a single board layer in a region 23 corresponding to the through hole 21 . The area 23 of the front panel 13 is embossed to form a bulge towards the outside of the panel. The switch pressing member 25 is accommodated in the through hole 21 . When the switch pressing member 25 is pressed through the area 23 (referred to as a raised portion) of the front panel 13, the switch 27 is switched between on and off according to the pressing operation.

When molding the display panel 100 , the embossed portion 23 is formed by pressing a convex mold against the front plate 13 to plastically deform the front plate 13 . The embossed portion 23 can be used as a push button switch by being deformed from a convex to a flat or concave shape. The embossed portion 23 and the embossed outer edge portion 29 of the front plate 13 are colored by printing so that the switch pressing member 25 and the switch 27 cannot be viewed from the outside of the display panel 100 .

Also, the embossed portion 23 appears as if it rises three-dimensionally on the front panel 13 . Therefore, the design performance of the display panel 100 is improved to increase the visibility of the embossed portion 23 .

Light sources 31 and 33 (for example, LEDs) are arranged on the rear panel 15 side of the display panel 100 . The light sources 31 and 33 are spaced apart from the display panel 100 . The regions 19a and 19b of the rear plate 15 correspond to the irradiation positions of the light sources 31 and 33, and are printed with a medium so as to be given light diffusing properties. Media printing is a printing method that uses inks without pigments. When the light from the light source illuminates the media printing areas 19a and 19b, the light passes through and is emitted from the entire media printing area while being diffused. Areas other than the media print area are also mask printed on the print layer to prevent light from the light source from passing through. Furthermore, it may be preferable to arrange so that each of the light sources 31 and 33 is partitioned by the partition wall 35 to avoid interference of irradiated light and influence of external light.

When the light source 31 is turned on (ON) and the light source 33 is turned off (OFF), all of the medium printing area 19 a facing the on-state light source 31 is brightly illuminated. On the other hand, when the medium printed area 19b faces the light source 33 in the off state, only the reflected light of the light from the display surface side can be seen. That is, by selectively turning on/off the light sources 31 and 33, the media print areas 19a and 19b can be selectively illuminated. Accordingly, for example, the status of an electronic device in which the display panel 100 is mounted can be displayed.

Light output from the light source 31 may be reflected as return light L by the boundary surface of the panel base 11 . But the return light L is not reflected again or returned to the display side. Therefore, even when the light sources 31 and 33 are placed adjacently, light leakage does not appear. Thus, high-quality display is obtained.

At the end of the display panel 100 , joining hooks 37 are integrally formed as joining units for fixing the display panel 100 to an object to be joined (for example, an electronic device). Therefore, if the front plate 13 is transparent, since the panel base 11 is also transparent, there arises a problem that the engagement hook 37 is seen from the display side. Accordingly, the front panel 13 has a colored and thus opaque printed area 39 in at least the area corresponding to the engagement hook 37 . This printed area 39 hides the engaging hooks 37 of the panel base 11 from the display side. Thereby, problems in appearance are eliminated. In addition, since the peripheral area is constituted by the printed area 39, satisfactory design performance can be obtained, and the non-displayed portion can be hidden without any awkward feeling.

Next, an example in which the above-described display panel 100 is mounted to a microwave oven as an electronic device will be described.

FIG. 2 is a front view of a microwave oven installed with a display panel according to the present invention.

The microwave oven 200 is a heating and cooking device that supplies high-frequency waves (microwaves) and the like into a heating chamber containing an object to be heated to heat the object. A heating chamber is formed inside a box-type main body container 41 with a front opening. An opening/closing door 43 for opening and closing to take an object to be heated into/out of the heating chamber is provided on the front of the main body container 41 . The opening/closing door 43 is hinged at its lower end to the lower edge of the main body container 41 so that it can be freely pulled forward to open and pushed in to close. In the lower part of the opening/closing door 43, the display panel 100 according to the present invention is installed.

In this case, the display panel 100 is also used as an operation panel of the microwave oven 200, and is provided with menu keys and the like. In addition to various operation switches, such as a start key for instructing to start heating, a manual mode cooking key; an automatic cooking key for selecting a prepared cooking program; a knob 45 for setting temperature, time or the like; A display portion 47 for displaying setting status on a liquid crystal display device or the like; and a light source 49 for a notification unit for notifying setting menus, operation procedures, and the like. The display panel 100 is attached to the device by engaging the lower portion of the hook 37 below the opening/closing door 43 .

Fig. 3 is an exploded perspective view illustrating the steps of assembling the display panel to the opening/closing door.

In a lower portion of the opening/closing door 43, an operation and control unit accommodation space 51 is formed. In this operation and control unit accommodating space 51, the display panel 100 is fixed along the rear panel 55 mounted with the circuit board 53 with the rear panel 55 sandwiching them. As shown in FIG. 1 , the switch pressing member 25 , the switch 27 , the light sources 31 and 33 , the partition wall 35 , and the like are arranged on the rear panel 55 . By assembling the rear panel 55 to the display panel 100, a control type display panel having input and display (notification) functions is constituted. Here, the structure in which the control type display panel is fitted to the opening/closing door 43 has been described. However, a control type display panel may also be provided on a portion other than the opening/closing door 43 .

Here, an example of the structure of the microwave oven 200 in which the display panel 100 according to the present invention is provided will be described in further detail.

FIG. 4 is an external perspective view of the display panel 100 .

This display panel 100 has: an embossed portion 57 corresponding to heating mode selection keys such as “range”, “baking” and “grill/steam” shown as examples; an embossed portion 59 corresponding to An automatic heating key for completing heating of a specific object according to a program in which a specific heating object (here, heating a beverage) is set; an embossed portion 61 corresponding to a cancel key for canceling an operation; and an embossed portion 63 corresponding to an indication Start button to start heating. At the same time, the display panel 100 also has a plurality of selection display parts 69, such as a display area 65 with a light on when grilling and heating, and a display area 67 with a light on when steaming and heating, in which The selection display portion 69 as a notification unit is selectively opened to notify the heating setting content.

In addition, the display panel 100 has a transparent portion 71 for the display portion 47 shown in FIG. 2 and is formed with an opening 73 for fitting the knob 45 . In the vicinity of the installation position of the knob 45 , a display area 75 containing a character string or the like that is selectively lit corresponding to the heating mode setting is arranged.

As shown in FIG. 1 , the display panel 100 having the above-mentioned appearance includes the configuration that the front plate 13 and the rear plate 15 are respectively provided with printed layers, and are integrally formed with the panel base 11 .

5A and 5B show front and rear plates for the display panel shown in FIG. 4 .

The front panel 13 shown in FIG. 5A has a raised portion 57 corresponding to the heating mode selection key, a raised portion 59 corresponding to the automatic heating key, a raised portion 61 corresponding to the cancel key and a raised portion corresponding to the start key. Part 63; each of them is printed with characters indicating the content of the key and an opaque base. A transparent portion 77 for a light indicator is formed on the embossed portion 63 corresponding to the activation key. Strip-shaped medium printing areas 79 a and 79 b are formed along upper and lower edge portions to include positions corresponding to edge portions where the display panel 100 is disposed to engage the hooks 37 . At the same time, printing areas are formed on the peripheries of the openings 73, respectively. Areas other than the printed area in the above-mentioned front plate 13 are transparent.

The rear panel 15 is formed with the same opening 73 as the front panel 13 . Part of display area 75, light display portion 69, and areas 83 and 84 are all media printed; other character strings ("1-layer" (1-shelf), "2-layer", "grill", " Steam", "Auto Menu", etc.). Furthermore, regardless of these displays, an opaque pattern 85 that will color the entire panel is printed as a base for the entire panel.

These front plate 13 and rear plate 15 are integrally assembled on the panel base 11 having translucency. Thereby, a display with the perceived quality of depth and translucency as shown in FIG. 4 is obtained. At the same time, the part for operating the microwave oven is printed on the front panel 13 side, and the set content and status are displayed on the rear panel 15 side. Thereby, the visibility and operability of the microwave oven are improved, and user-friendliness is also increased.

Next, the lighting effect from the rear side of the display panel 100 will be described in detail.

Figure 6 is a perspective view of the rear panel. 7 is a sectional view showing a display panel portion and an opening/closing door taken along line VII-VII in FIG. 6 .

As shown in FIG. 6, in the circuit board 53 assembled to the rear panel 55, a plurality of LEDs 87 used as display light sources are arranged corresponding to the light display portion 69, the display area 75, and areas 83 and 84 in the rear panel 15. In addition, a partition wall 35 for covering the periphery of each LED 87 is formed. The relationship between each LED 87 and the partition wall 35 is shown in detail in FIG. 7 .

In the display panel 100 , as described above, the light output from the light source is occasionally reflected by the boundary surface of the panel base 11 to generate return light. However, the return light is neither reflected again nor returned to the display side. Therefore, even when the LEDs 87 are arranged close to each other, no light leakage is exhibited.

In addition, the LED 87 is arranged away from the display panel 100 and separated from the surrounding environment by the partition wall 35. Thereby, external light is prevented from entering the inside of the partition wall 35 . In this way, only the light having the LED 87 directly facing the display panel 100 component is selectively irradiated to the display panel 100. Due to the above-described configuration, light leakage prevention functions in various ways, thereby obtaining a higher-quality display.

8 and 9 show states in which light display is performed while preventing light leakage.

Fig. 8 shows the display area 75 where the media is printed on the rear plate 15, and the on/off status of "Output" and "Temperature" are shown in Figs. 8A and 8B. As described above, by performing medium printing on the character (drawn characters) portion such as "output" and "temperature", when the character portion is not illuminated, it appears as if there is no character; thus a simple design is obtained. As a result, a display mode that is convenient to use is obtained.

FIG. 8A shows a state in which only the characters of "output" are illuminated when the content to be displayed on the display section 47 (refer to FIG. 2) is an output value. FIG. 8B shows a state in which only the characters of "temperature" are illuminated when the content to be displayed on the display section 47 (refer to FIG. 2) is temperature. As described above, by illuminating characters such as "output" and "temperature" themselves, the user can be clearly notified of the content displayed on the display section 47 without misunderstanding.

In the notification method of illuminating the characters themselves as described above, the user can recognize the displayed content in a state where all the characters to be displayed can be seen and unnecessary illuminated displays are not found around them. Therefore, it is necessary to illuminate characters to be displayed with uniform luminance; and it is necessary to ensure that characters that should not be displayed close thereto are prevented from being illuminated. However, due to the miniaturization trend of electronic devices (eg, microwave ovens), the available area for display on the display panel is limited and the display density is increased. Furthermore, with the trend of higher device performance, the amount of content to be displayed is also increasing. As a result, characters that need to be distinguished from each other are required to be displayed very close to each other. Therefore, in the conventional method of preventing light leakage in which the partition wall 35 is formed around the light source, there arises a problem that adjacent characters are illuminated.

The above situation is the same as that in the light display portion shown in FIG. 9 . The distribution distance D of the LEDs must be arranged to be smaller, and light on the side to be turned on must be prevented from leaking to the side to be turned off. However, in conventional methods for preventing light leakage, it is difficult to prevent light leakage in a reliable manner.

However, in the display panel according to the present invention, since a configuration is employed that reliably prevents return light of the light source from being reflected to the display side, light leakage does not occur. Therefore, by using this display panel 100, the partition wall 35 designed in a conventional light leakage prevention method ensures stable high-quality display without light leakage without special design modification.

Next, an example of the molding method of the display panel 100 will be briefly introduced.

FIG. 10 shows the molding sequence of the display panel.

The display panel 100 is extruded and molded in a mold of an injection molding machine. First, as shown in FIG. 10A, the front plate 13 is placed on a mold 91; and the rear plate 15 is placed on another mold 93. The mold 91 is formed with a concave portion 91a for forming an embossed portion; a convex portion 93a is formed on the mold 93 corresponding to the concave portion 91a. The rear plate 15 is placed on the mold 93, and the embossed portion 93a is inserted through the opening 73.

Then, as shown in FIG. 10B, the molds 91 and 93 are closed and the temperature of the molds is controlled to a predetermined temperature. A molding material such as a transparent resin material is injected into the mold and kept under pressure. Here, molding material is injected between the front plate 13 and the rear plate 15 arranged in the mold cavity. Since the convex portion 93a of the die 93 presses the front plate 13 against the concave portion 91a of the die 91, the front plate 13 is deformed along the concave portion 91a and embossed. Next, as shown in FIG. 10C , after cooling for a predetermined period of time, the mold is opened, and the molded product (display panel 100 ) is taken out. In this method, the front panel 13 and the rear panel 15 are integrally formed with the panel base 11 (the molding material sandwiched therebetween), and the embossed portion is formed on a part of the front panel 13 .

Hereinafter, the display panel 100 will be specifically described in order.

FIG. 11 is a cross-sectional view of the display panel. 12A and 12B respectively show examples of the end structures of the front plate and the rear plate in the enlarged part of the part B shown in FIG. 11 . FIG. 13 is an enlarged sectional view of a portion C shown in FIG. 11 .

12A shows an example of part B in FIG.

The end portion of the rear plate 15 is arranged on a portion more inward than the side end surface 11 b of the panel base 11 . The reason for this is as follows; that is, in the insert molding process, precise alignment between the end of the plate and the end of the resin is difficult, and when the plate protrudes from the end of the resin, the molded product is processed or the board cut off. Furthermore, in the case of disposing the rear plate inside the resin end, when viewed from the front side of the display panel 100, the joint between the rear plate 15 and the resin portion becomes visible, if the joint Leaving it intact can cause cosmetic problems. Therefore, by forming the media printed area 39 at the end of the front plate 13 to hide the junction, the problem of appearance is eliminated. As for the alignment between the plate end of the front plate 13 and the resin end, according to such a configuration, it is possible to eliminate the misalignment problem by forming the bent portion 97 in the same way as above.

In the bent portion 97, the turning length La from the end of the front plate 13 is at least 2 mm or more to allow a margin for offset. Further, a medium printed area 39 is formed in which the length Lb from the side end surface 11b of the panel base 11 is 2 mm or more. As for the end of the rear panel 15, the length Lc from the side end surface 11b of the panel base 11 is preferably set to 0.3 mm or less.

When the panel base 11 has sufficient space in thickness, it may be arranged so that the rear plate 15 turns as shown in FIG. 12B .

In part C shown in FIG. 13 , ribs 99 are formed at the ends of the panel base 11 . To prevent the ribs 99 from being seen from the front side, the front panel 13 has a medium printed area 39 and an opaque printed area 40 . The end portion of the front plate 13 is turned toward the inner side surface 99a of the rib plate 99 by a length La. On the other hand, the end portion of the rear plate 15 is turned toward the inner side surface 99b of the rib plate 99 by the length Ld. The length Ld is preferably set to 1 mm or more in order to secure a margin for board alignment.

Furthermore, on the outer side surface 99a of the rib 99, an opening 98 for injecting a transparent resin material into the panel base 11 is formed. Defects and the like caused by cutting openings 98 after molding are hidden by media printed areas 39 and opaque printed areas 40 .

Next, a configuration will be described in which a front plate and a rear plate are formed on a convex portion and a through hole formed in a part of the front surface of the display panel 100 .

Fig. 14 illustrates the mounting portion of the knob on the display panel.

The panel base 11 of the display panel 100 has an opening 73 through which a shaft for fitting a knob (refer to FIGS. 2 and 3 ) is inserted. On the periphery of the through hole, a convex portion 103 protruding toward the display side is formed. The front plate 13 extends along the outer edge surface of the convex portion 103 with its end located at a distance Le from the front end surface 103 a of the convex portion 103 . The length Le is set to 1 mm or less. The rear plate 15 is turned toward the edge portion of the opening 73 by the length Ld. The length Ld is set to 0.5 mm or more. As described above, the end portion of the front plate 13 is disposed at a point forward of the front end surface 103a of the convex portion 103, and the bent portion 105 is formed in the rear plate 15. Thereby, the arrangement of the ends of each plate is done, which also simplifies the manufacturing process.

Next, a structure in which a rear plate is formed on a convex portion formed in a portion of the front surface of the display panel 100 will be described.

15 is a schematic cross-sectional view of a concave portion formed on a display panel.

In the panel base 11 of the display panel 100, a concave portion 111 is formed at a position opposed to the display portion 47 (refer to FIG. 2). The rear plate 15 is formed along the convex front surface of the concave portion 111 in a region corresponding to the concave portion 111 . The area of the back plate 15 facing the concave portion 111 is transparent. Therefore, the rear plate 15 is previously deformed into a convex shape in a position facing the display portion 47, and in this convex portion, double-sided insert molding is performed.

In this structure, since the concave portion 111 is formed at a position facing the display device 117, the distance between the display device 117 and the display panel 100 can be reduced, as shown by P1 in FIG. 15 . As a result, the transparency of display light is increased, and the viewing angle is widened.

Conventionally, the display panel 100 is formed of a plate having an elasticity of about 0.2 to 0.3 mm. In this case, in order to prevent the display device from coming into contact with the display part when the finger presses it, the display panel 100 and the display device of the display part are arranged at a predetermined separation distance, as shown by dotted line P2 in FIG. 15 . As a result, the display area and viewing angle of the display unit are limited. However, due to the arrangement of the present invention, the above-mentioned limitations can be greatly alleviated. As for the concave portion 111, by setting the recessed amount H from the front surface of the panel base 11 to about 1 mm, it is possible to secure a necessary depth for the turning process of the rear plate 14.

Next, the end structure of the display panel 100 will be described.

Fig. 16 is a partial sectional view schematically showing a rear panel having a display panel and a light source. The rear panel 55 including the light sources 31 and 33 and the partition wall 35 is assembled to the rear side of the display panel 100 opposite to the display side. The light from the light source 31 in the on state illuminates the printed layer 19a of the front plate 13. Here, the illuminating light passes through the display panel 100 toward the display side, and a part thereof is directed toward the side end surface of the panel base 11 due to reflection at the boundary surface or the like. In this case, a so-called light edge phenomenon that illuminates the end of the display panel 100 occurs. Therefore, in the structure of the present invention, the side end surface of the display panel 100 is formed with a medium printing area 39, thereby hiding the above-mentioned light edge. Here, a media print area 39 is used. However, the present invention is not limited by the above. Solid printing can be used. In FIG. 16 , upper and lower side end surfaces on the display panel 100 are shown. However, the printing area may preferably be formed on the entire periphery around the display panel 100 if necessary. Thus, the light edge can be well hidden. Therefore, problems in appearance can be reliably prevented.

Next, a modification having a structure in which the engaging unit of the display panel has no fitting hook will be described.

FIG. 17 is an external perspective view of a display panel according to this variation.

Ribs 121 are formed at side end portions of the panel base 11 of the display panel 150 . Through holes 123 are formed in the rib plate 121 . The display panel 150 is arranged such that the display panel 150 itself does not have an engaging hook, but an engaging hook is formed on an object to be joined; and thus, the engaging hook is engaged with the through hole 123 in the display panel 150 . In addition, if necessary, a through hole 125 fixed by screwing may be formed to increase the connection strength of the assembled object.

According to the structure of the display panel 150, only simple ribs 121 and through holes 123 are formed instead of engagement hooks formed in a plurality of faces. The structure and manufacturing process are thus simplified.

Also, the display panel may have the following structure.

FIG. 18 is a cross-sectional view of a display panel.

In the display panel 160 of this structure, a stepped portion 68 is formed on a portion where the rear side light display portion 69 of the panel base 11 is arranged. That is, the characters of "grilling", "steaming" and the like are arranged on the rear panel 15 such that the characters are arranged on the inclined surfaces 70 and 72 of the stepped portion 68 of the panel base 11 .

Direct the normal direction of the inclined surfaces 70 and 72 toward the user of the display panel 160 . Thus, the characters arranged on the inclined surfaces 70 and 72 can be easily visually recognized. An elegant appearance and a high-quality feel of the display panel 160 can be obtained.

Hereinafter, examples of preferred embodiments of the insert molding method according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 19 is a sectional view illustrating an insert molding method according to a second embodiment of the present invention. 20A to 20E show molding processes for the insert molding method shown in FIG. 19 . Fig. 21 is a schematic view of a gate and its periphery in the insert molding method shown in Fig. 19 . Fig. 22 is an external view of the gate and its periphery in the first half of the insert molding method shown in Fig. 19 . Fig. 23 is an external view of the gate and its periphery in the second half of the insert molding method shown in Fig. 19 .

As shown in FIG. 19 , the insert molding method of the second embodiment of the present invention uses a molding machine 10 including an upper mold 11 and a lower mold 12 . The plate 14 is placed on the side of the lower mold 12 in the cavity 13 formed by the upper mold 11 and the lower mold 12 .

A concave portion 15 is formed in the upper mold 11 , and a convex portion 16 facing the concave 15 is formed in the lower mold 12 . A gate 17 for filling a resin material is formed between an end portion of the upper mold 11 and an end portion of the lower mold 12 . The upper mold 11 and the lower mold 12 are separated at a parting line PL.

Plate 14 is made of a thin plate piece of macromolecular material with a thermal resistance of 160 to 180°C. An extension portion 18 extending toward the end of the lower mold 12 is formed on the base end side. On the extension 18 of the plate 14 a gate 17 is arranged.

Next, molding steps of insert molding performed by the molding machine 10 will be described with reference to FIGS. 20A to 20E.

As shown in FIG. 20A , in the first step, the upper mold 11 is separated from the lower mold 12 .

As shown in FIG. 20B , in the second step, a plate 14 is arranged on the lower mold 12 . Here, the extension 18 of the plate 14 is arranged so as to extend over the lower mold 12 towards the end of the lower mold 12 . On the side opposite to the extended portion 18 , a bent portion 19 is formed at the end of the plate 14 . The bent portion 19 is not bent at a right angle corresponding to the edge portion of the upper mold 11, but is bent at an angle of about 45°.

As shown in Figure 20C, in the third step, an upper mold moving mechanism (not shown) starts moving the upper mold 11 to the lower mold 12, and when a cavity of predetermined capacity is formed between the lower mold 12 and the upper mold 11 At 13 o'clock, the movement of the upper mold 11 is stopped. From the gate 17 arranged above the extended portion 18 of the plate 14 , a resin material 20 heated at a high temperature is pressurized and supplied to the inside of the cavity 13 . Here, as the resin material 20, polycarbonate resin whose molding temperature is 270 to 280°C, elastic polyethylene terephthalate resin (PET) whose molding temperature is 240°C, and acrylic resin whose molding temperature is 230°C can be used. Nitrile-butadiene-styrene (ABS). Since the gate 17 is arranged above the extension portion 18 , the resin material 20 supplied from the gate 17 to the inside of the cavity 13 is supplied inside the entire cavity 13 when the extension portion 18 is squeezed. And, the resin material is cooled for a predetermined time.

In the fourth step, as shown in FIG. 20D , the upper mold 11 is reversely moved by the upper mold moving mechanism. Here, the plate 14 is integrally molded with the resin material 20 , and the extension portion 18 is also integrally molded with the resin material 20 . Due to the movement of the pressurized resin material 20, the bent portion 19 of the plate 14 is formed into a right angle.

In the fifth step, as shown in FIG. 20E , the molding member 21 is removed from the positioning pin (not shown) of the lower mold 12 in which the extension portion 18 of the plate 14 is integrally molded with the resin material 20 . Burrs are removed from the extension portion 18 of the plate 14 and the gate 17 portion of the resin material 20; thus, a molded product 22 is formed.

As shown in FIG. 21 , the extension portion 18 of the plate 14 extends up to portions on both sides of the gate 17 with a width W (for example, 10 mm) larger than the inner diameter φD of the gate 17 (for example, 7 mm). Thus, the pressure applied by the resin material 20 supplied from the gate 17 can be uniformly and stably received. Thus, the plate 14 is integrally molded at a predetermined position relative to the resin material 20 without displacement during molding.

As shown in FIGS. 22 and 23 , in a third step shown in FIG. 20C , a resin material 20 heated at a high temperature is supplied to the inside of the cavity 13 from the gate 17 arranged above the extending portion 18 of the plate 14 . At this time, even the extended portion 18 of the plate 14 floats away from the bent lower mold 12 while the pressure of the resin material 20 injected from the gate 17 supports the extended portion 18 . Due to the great pressure of the resin material 20 from the extended portion 18 side, the plate 14 is reliably in close contact with the resin material 20 .

According to the insert molding method of the second embodiment, the gate 17b for filling the resin material is formed above the extended portion 18 of the plate 14 extending from the cavity 13 . Therefore, molding is performed while the gate 17 is pressing down the plate 14 . The board 14 is accurately positioned and integrally formed without peeling or bending; thereby, the board 14 can be stably formed into a desired structure.

Meanwhile, according to the insert molding method of the second embodiment, the width W of the extended portion 18 of the plate 14 is formed wider than the diameter φD of the gate 17 . Therefore, it is possible to withstand the pressure from the gate 17 uniformly and stably.

Furthermore, according to the insert molding method of the second embodiment, the pressure from the gate 17 can be applied to the extended portion 18 of the plate 14 extending to both sides of the gate 17 . Even if the temperature of the filled resin material 20 is high, the positioning accuracy of the board 14 can be improved.

Next, an insert molding method according to a third embodiment of the present invention will be described with reference to FIGS. 24 to 35. FIG. Fig. 24 is a sectional view illustrating an insert molding method according to a third embodiment of the present invention. FIG. 25 illustrates the state in the first half of molding in the insert molding method shown in FIG. 24 . FIG. 26 illustrates the state in the second half of molding in the insert molding method shown in FIG. 24 . FIG. 27 is a sectional view of a shaped article formed by insert molding as shown in FIG. 24 . FIG. 28 is an external perspective view of a portion of a good product formed according to the insert molding method shown in FIG. 24. FIG. FIG. 29 is an external perspective view of a part of a defective product formed by the insert molding method shown in FIG. 24 .

Fig. 30 is a perspective view of the inside of the mold in the insert molding method shown in Fig. 24, in which the upper mold is omitted. Fig. 31 is a sectional view illustrating board mounting in the insert molding method shown in Fig. 24 . Fig. 32 is a partially enlarged sectional view of a plate in the insert molding method described in Fig. 24 . Fig. 33 is an assembly view of a molded article formed according to the insert molding method shown in Fig. 24 . FIG. 34 is an external view of a plate variation in the insert molding method shown in FIG. 24. FIG. FIG. 35 is an external view showing a modification of the plate from that shown in FIG. 34 . As for the same or equivalent parts as those in the second embodiment, their description will be omitted or simplified.

As shown in FIG. 24 , the insert molding method according to the third embodiment uses a molding machine 30 equipped with an upper mold 31 and a lower mold 32 . A rear plate 34 is arranged on the lower mold 32 side in a cavity 33 formed by the upper mold 31 and the lower mold 32 ; and a front plate 35 is arranged on the upper mold 31 side in the cavity 33 .

In the upper mold 31, a spherical concave portion 37 having a hemispherical shape is formed in the central area of the concave portion 36; in the lower mold 32, a spherical concave portion 39 having a hemispherical shape is formed in the central area of the convex portion 38, which faces A spherical concave portion 37 is arranged. Between the end of the upper mold 31 and the end of the lower mold 32, a gate 40 for filling a resin material is formed. The gate 40 is arranged above the extension 41 of the rear plate 34 .

The rear plate 34 is a plate member of transparent or translucent resin; in the spherical convex portion 39 of the lower mold 32, a circular opening 42 is formed, and a curved portion 43 is formed at an inner edge portion of this opening 42. The bent portion 43 is bent not at a right angle, but at an angle of about 45 degrees. In addition, a bent portion 44 is formed at an end portion of the rear plate 34 on a side opposite to the extended portion 41 .

The front plate 35 is an elastically deformable plate formed of transparent or translucent resin. In order to form the cavity 33 of a predetermined volume, a dome-shaped convex surface portion 45 is formed, and the plate is molded into a single state in a state when the upper mold 31 moves toward the lower mold 32 .

25 and 26, when the resin material 46 heated at high temperature is pressurized and supplied to the inside of the cavity 33 from the gate 40 arranged above the extended portion 41 of the plate 34, even when the extended portion 41 of the rear plate 34 When bending and detaching from the lower mold 32, since the extension 41 is pressed and supported by the resin material 46 injected from the gate 40, the rear plate 34 and the front plate 34 and the front plate will 35 is reliably in close contact with the resin material 46 .

As shown in FIG. 27 , from the gate 40 , a resin material 46 is pressurized and supplied into the cavity 33 . After cooling, the molds 31 and 32 were separated. The burrs are removed from the extension 41 of the rear plate 34 and the gate 40 portion in the resin material 46 . In this way, the front plate 34 as the front surface and the rear plate 35 as the rear surface are integrally molded, each disposed at a predetermined position; thereby forming the molded product 47 . In the molded product 47, since the resin material 46 is not supplied to the rear side of the convex surface portion 45 of the front plate 35, a cylindrical hole 48 is formed. Here, due to the movement of the pressurized resin material 46, the bent portion 43 of the rear plate 34 is formed into a right angle, and its bent portion 43 is formed into a plane. This raised surface portion 45 is used in a state where the movable piece of the switch (shown in FIG. 33 ) 85 is inserted into the hole 48, and the front end of the movable piece is in contact with the rear surface of the raised surface portion 45. touch.

As shown in FIG. 28, when the molded article 47 is used as a display panel, in the front surface of the raised surface portion 45 in the front plate 35, a predetermined index mark 49 is printed. Thus, by accurately positioning the front plate 35 at a predetermined position and integrally molding the resin material 46, the index mark 49 can be provided in a symmetrical manner in the central area of the raised surface portion 45.

As shown in FIG. 29, when molding the front plate 35 which is not accurately positioned at the predetermined position, the index mark 49 is displaced from the central area of the raised surface portion 45, resulting in a defective product. As described above, when the molded article 47 is used as a display panel, accurate positioning is required with respect to switches, lamps, etc. integrally assembled with the display panel. By accurately positioning the front plate 35 and the rear plate 34 at predetermined positions of the resin material 46, a high-quality molded product 47 with no displacement relative to switches, lamps, etc. can be formed.

As shown in FIG. 30 , in the extended portion 41 of the rear plate 34 , a support hole 50 is formed at an end face position relative to the position of the gate 40 . The support hole 50 is positioned by inserting a shaft 51 protrudingly formed on the lower mold 32 . Typically, holes are formed in the mold for holding the plate by vacuum suction. However, in this method, not only the plate flows and shifts in the mold when the resin is filled, but also the marks are left on the rear surface of the molded article. Therefore, by inserting the shaft 51 into the support hole 50, the rear plate 34 can be positioned at a predetermined position without displacement.

As shown in FIG. 31, the front plate 35 can be positioned only by fitting the front plate 35 into the concave portion 36 of the upper mold 31 since the molded end is bent. The convex surface portion 45 is formed by elastically deforming the spherical convex portion 39 of the lower mold 32 into a dome shape.

As shown in FIG. 32, the bent portion 43 of the opening 42 in the rear plate 34 is not bent at right angles before molding, and the bent portion 43 is formed at right angles by the movement of the pressurized resin material 46.

As shown in FIG. 33 , the molded product 47 is mounted on an electronic device 80 to be used as a display panel 90 . In this electronic device 80 , a plurality of LEDs 83 are electrically connected to a circuit board 82 mounted on a rear panel 81 . The plurality of LEDs 83 respectively display the light display portion, the display area, and the area formed by the partition wall 84 formed on the rear plate 34. The movable piece 86 of the switch 85 is inserted into the hole 48 in the raised surface portion 45, and the front end of the movable piece 86 comes into contact with the rear surface of the raised surface portion 45. In this electronic device 80, by depressing the raised surface portion 45, the movable piece 86 is moved so that the switch 85 is switched.

Next, a modification of the supporting method in the rear plate 34 will be described with reference to FIG. 34 .

As shown in FIG. 34 , in this modification, a plurality of extensions 41 , for example, eight extensions, are formed on the edge portion of the rear plate 34 . Therefore, due to the plurality of extending portions 41 , a uniform supporting force can be applied to the gate 40 . In this way, positioning accuracy can be further increased.

Next, another modification of the supporting method in the rear plate 34 will be described with reference to FIG. 35 .

As shown in FIG. 35 , according to this modification, an integral extension 41 is formed on the entire periphery of the peripheral portion of the rear plate 34 on the side of the lower mold 32 . Therefore, the supporting force near the gate 40 is further improved due to the extended portion 41 arranged all around. In this way, positioning accuracy can be further increased.

According to the insert molding method of the third embodiment, double-sided insert molding can be performed in which the rear plate 34 and the front plate 35 arranged on both sides of the cavity 33 are integrally molded stably.

In addition, according to the insert molding method of this third embodiment, by using the molded product 47 for the display panel 90 with the switch 85, it is possible to form a display panel in which the rear plate 34 and the front plate 35 are reliably integrally molded and form a stable structure.

There is a case in which two single-sided insert molding parts are combined and superimposed on each other. In this case, it is difficult for the external structures of the two molded articles to coincide with each other, so that a gap is generated between them after they are superimposed on each other. Thus, it is difficult to combine these molded articles with high precision and high yield. However, by carrying out the present invention, high-precision bonding can be achieved while aligning the outer structure of the molded product without gaps.

The present invention is not limited to the above-described embodiments, but appropriate changes, modifications, and the like can be made.

For example, basically a single gate will do. However, a plurality of gates may be additionally formed in consideration of displacement of the resin material. In such cases, these gates are preferably arranged above the plate extension.

While certain preferred embodiments have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifications can be made based on the teachings of the invention. It is apparent that such changes and modifications are within the spirit, scope and intent of the invention as defined by the appended claims.

The present invention is based on Japanese Patent Application No. 2004-039446 filed on February 17, 2004 and Japanese Patent Application No. 2004-143224 filed on May 13, 2004, the contents of which are incorporated herein by reference.

Claims (14)

1. display panel, it is suitable for being installed on the electronic installation, comprising:

First printed display layer;

Transparent material layer is provided on described first printed display layer; And

Second printed display layer is provided on the described transparent material layer and makes corresponding to described first printed display layer,

Wherein said first printed display layer and described second printed display layer are by produced by insert molding and global formation relative to one another, and transparent material layer is clipped in the middle of first printed display layer and second printed display layer; And

Wherein show described second printed display layer by described transparent material layer from described first printed display layer, one side, and

Wherein transparent material layer has the panel base of being made by transparent resin.

2. display panel as claimed in claim 1, wherein said first printed display layer is first printed panel, described first printed panel includes translucent base and is formed on described suprabasil first printing zone.

3. display panel as claimed in claim 1, wherein said second printed display layer is second printed panel, described second printed panel includes translucent base and is formed on described suprabasil second printing zone.

4. display panel as claimed in claim 1, wherein said first printed display layer is first printed panel, described first printed panel includes translucent base and is formed on described suprabasil first printing zone;

Wherein said second printed display layer is second printed panel, and described second printed panel includes translucent base and is formed on described suprabasil second printing zone;

Wherein said transparent material layer has first through hole;

Wherein said second printed panel has second through hole that communicates with described first through hole; And

Wherein said first printed panel has at the single flaggy corresponding to described first via regions.

5. display panel as claimed in claim 4, wherein handle through relief in the zone of the single flaggy in described first printed panel.

6. display panel as claimed in claim 2, at least a portion of wherein said first printing zone is handled with the dielectric printing with light diffusion property.

7. display panel as claimed in claim 3, at least a portion of wherein said second printing zone is handled with the dielectric printing with light diffusion property.

8. display panel as claimed in claim 2, the bonding part that wherein is used for fixing described display panel is formed on the periphery of described transparent material layer; And

First printing zone of wherein said first printed panel has zone of opacity, and described zone of opacity is arranged corresponding to described bonding part.

9. display panel as claimed in claim 1, wherein said first printed display layer is first printed panel, described first printed panel includes translucent base and is formed on described suprabasil first printing zone;

Wherein second printed display layer is second printed panel, and described second printed panel includes translucent base and is formed on described suprabasil second printing zone; And

Wherein be formed with sweep at least a portion at described transparent material layer edge, extend to the side end surface of described transparent material layer from the surface of described transparent material layer the end of at least one in first printed panel described in the described sweep and described second printed panel.

10. display panel as claimed in claim 1, wherein said first printed display layer is first printed panel, described first printed panel includes translucent base and is formed on described suprabasil first printing zone;

Wherein said second printed display layer is second printed panel, and described second printed panel includes translucent base and is formed on described suprabasil second printing zone;

Wherein provide floor portion in the periphery of described transparent material layer so that it is side-prominent to described second printed panel;

The surface of wherein said floor portion is connected to the surface of described transparent material layer; With

Wherein at least at the surperficial sweep that forms of described floor portion, extend to the side end surface of described transparent material layer from the surface of described transparent material layer the end of at least one in first printed panel described in the described sweep and second printed panel.

11. display panel as claimed in claim 1, wherein said first printed display layer is first printed panel, and described first printed panel includes translucent substrate and is formed on described suprabasil first printing zone;

Wherein said second printed display layer is second printed panel, and described second printed panel includes translucent base and is formed on described suprabasil second printing zone;

Wherein on described transparent material layer, provide projection;

Wherein forming opening portion in described first printed panel and second printed panel at least one makes and appears described projection from described opening portion; With

Wherein form sweep in the periphery of the projection of described transparent material layer, extend along the side surface of described transparent material layer projection the end of the opening portion periphery of at least one in first printed panel described in the described sweep and second printed panel.

12. a control type display panel comprises:

Display panel according to claim 4 to 11;

Be arranged in the switch press parts in described first through hole and second through hole; With

Carry out the switch element of switching manipulation by receiving an operation, in described operation, pass through the single flaggy push switch pressing component of described first printed panel.

13. control type display panel as claimed in claim 12, first printing zone of wherein said first printed panel has zone of opacity.

14. a control type display panel comprises:

According to the display panel of claim 6 to 11 and

Be arranged in the light source of second printed panel, one side of described display panel,

Wherein on described second printed panel, form described second printing zone with irradiation position corresponding to described light source; With

Wherein said second printed panel comprises the zone with the media processes with light diffusion property.

Images