Injection molding die apparatus

Abstract

An injection molding die apparatus for forming a rear cover of a display device according to an embodiment disclosed herein may comprise a first die unit having a shape corresponding to a first surface of the rear cover. The injection molding die apparatus may include a second die unit that can be coupled to the first die unit and has a shape corresponding to a second surface opposite to the first surface of the rear cover. The first die unit may include a first die body. The first die unit may include at least one pair of insert cavities that protrude from a lower portion of the first die body. The second die unit may include a second die body that includes at least one pair of recessed portions for accommodating at least a portion of each of the insert cavities when the injection molding die apparatus is closed. The second die unit may include at least one pair of slide cores that are arranged to surround at least a portion of the insert cavities accommodated in the recessed portions when the injection molding die apparatus is closed, and include a slider that can move while contacting a portion of both side surfaces of the insert cavities.

Description

Injection mold device

[0001] Various embodiments of the present disclosure relate to an injection mold device for a rear cover of a display device.

[0002] A display device is a device that outputs images to a screen. Examples of display devices include televisions and computer monitors. The display device includes a display module on which images are displayed and a cover that covers at least a portion of the display module. The display device may further include a stand for supporting the display body, which includes the display module and the cover, on the ground or on furniture.

[0003] The stand can be coupled to the display body by inserting a portion of it into a fastening hole provided at the rear of the cover.

[0004] Typically, display device covers are formed through injection molding. Injection molding is a plastic molding method that involves injecting molten resin into upper and lower molds that correspond to the shape of the product, and then cooling the injected resin to form the product.

[0005] When the cover of a display device is injection molded, a fastening hole for fixing the stand is also molded together. However, if the temperatures of the upper and lower molds of the injection mold device are controlled differently during the injection process, the thermal expansion values ​​of the upper and lower molds will differ due to the temperature difference between the upper and lower molds. In this case, the part where the upper and lower molds come into contact and form the fastening hole may be pressed (or dented), thereby damaging the mold. In addition, the part where the upper and lower molds come into contact and form the fastening hole may be lifted, resulting in quality defects such as flash (or burr).

[0006] Various embodiments of the present disclosure can provide a lower mold having a slide structure that moves in a direction that offsets the difference in thermal expansion value when a difference in thermal expansion value occurs between the molds due to a temperature difference between the upper mold and the lower mold.

[0007] An injection molding device for forming a rear cover of a display device according to one embodiment of the present disclosure may include a first mold portion having a shape corresponding to a first surface of the rear cover. The injection molding device may include a second mold portion, which is connectable to the first mold portion and has a shape corresponding to a second surface of the rear cover opposite the first surface. The first mold portion may include a first mold body. The first mold portion may include at least one pair of insert cavities protruding from a lower portion of the first mold body. The second mold portion may include a second mold body including at least one pair of recessed portions that accommodate at least a portion of each of the insert cavities when the injection molding device is closed. The second mold portion may include at least one pair of slide cores, which are arranged to surround at least a portion of the insert cavities accommodated in the recessed portions when the injection molding device is closed, and which include sliders configured to be movable while in contact with portions of both sides of the insert cavities.

[0008] According to various embodiments of the present disclosure, when a difference in thermal expansion values ​​occurs between molds due to a temperature difference between upper and lower molds, the contact portion of the insert block forming the joint portion of the stand and the slide core are maintained in contact by a slider having a movable structure, thereby preventing excessive pressing (or stamping) or lifting between the contact portions, thereby reducing damage to the mold or quality defects such as flash occurring in the fastening hole of the stand joint portion.

[0009] The effects that can be achieved by the exemplary embodiments of the present disclosure can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain, from the following description. In other words, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0010] In connection with the description of the drawings, the same or similar reference numerals may be used for identical or similar components.

[0011] FIG. 1 is a front perspective view of a display device according to one embodiment of the present disclosure.

[0012] FIG. 2 is a rear perspective view of a display device according to one embodiment of the present disclosure.

[0013] FIG. 3 is a perspective view of a display device with the rear cover and stand separated according to one embodiment of the present disclosure.

[0014] FIG. 4 is an enlarged view of portion A of FIG. 3 according to one embodiment of the present disclosure.

[0015] FIG. 5 is an enlarged view of portion B of FIG. 3 according to one embodiment of the present disclosure.

[0016] FIG. 6 is an exploded perspective view of an injection mold device according to one embodiment of the present disclosure.

[0017] FIG. 7 is a vertical cross-sectional view of an injection mold device according to one embodiment of the present disclosure.

[0018] FIG. 8 is an enlarged view of portion C of FIG. 7 according to one embodiment of the present disclosure.

[0019] FIG. 9 is a portion of a horizontal cross-sectional view of an injection mold apparatus according to one embodiment of the present disclosure.

[0020] FIG. 10 is a perspective view of a slide core according to one embodiment of the present disclosure.

[0021] FIG. 11 is an exploded perspective view of a slide core according to one embodiment of the present disclosure.

[0022] FIG. 12 is an enlarged view of a portion of a cross-sectional view of an injection molding device according to one embodiment of the present disclosure.

[0023] FIG. 13a is an enlarged view of portion D shown in FIG. 12 according to one embodiment of the present disclosure.

[0024] Figure 13b is an enlarged view of a portion of a cross-sectional view of an injection mold device according to a comparative example of the present disclosure.

[0025] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to include various modifications, equivalents, or substitutes of the embodiments.

[0026] The singular form of a noun corresponding to an item may include one or more items, unless the context clearly indicates otherwise.

[0027] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0028] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0029] When a component (e.g., a first component) is referred to as being “coupled” or “connected” to another component (e.g., a second component), with or without the terms “functionally” or “communicatively,” it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0030] The terms “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0031] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0032] When we say that a component is “on” another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0033] The term “and / or” includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0034] The operating principle and embodiments of the present invention will be described with reference to the attached drawings below.

[0035] FIG. 1 is a front perspective view of a display device according to one embodiment of the present disclosure.

[0036] FIG. 2 is a rear perspective view of a display device according to one embodiment of the present disclosure.

[0037] FIG. 3 is a perspective view of a display device with the rear cover and stand separated according to one embodiment of the present disclosure.

[0038] FIG. 4 is an enlarged view of portion A of FIG. 3 according to one embodiment of the present disclosure.

[0039] FIG. 5 is an enlarged view of portion B of FIG. 3 according to one embodiment of the present disclosure.

[0040] Referring to FIGS. 1 to 5, a display device (100) according to one embodiment may include a display module (110), a cover (120), and a stand (130).

[0041] According to one embodiment, the display module (110) may be configured to output image information. In one embodiment, the display module (110) may include a self-luminous device that electrically excites a fluorescent organic compound, such as an organic light emitting diode (OLED), to emit light, or a light-receiving display device that includes a separate light source, such as a liquid crystal display (LCD). In one embodiment, the display module (110) may include a display panel that is provided to be deformable, and a display driver for driving the display panel. The display panel may include, for example, a liquid crystal display panel. The liquid crystal display panel may include a thin film transistor substrate including a thin film transistor, a color filter substrate facing the thin film transistor substrate, and a liquid crystal layer provided between the thin film transistor substrate and the color filter substrate. The display driver may include a circuit board for driving the display device (100) and a backlight unit disposed on the rear surface of the liquid crystal display panel. Although the liquid crystal display panel has been described as an example of the display panel, the present disclosure is not limited thereto.

[0042] According to one embodiment, the cover (120) may form the overall appearance of the display device (100). The cover (120) may be referred to as a housing.

[0043] According to one embodiment, the cover (120) may include a first cover (121) and a second cover (122) coupled with the first cover (121).

[0044] According to one embodiment, the first cover (121) may cover at least a portion of one side (e.g., the front side) (e.g., the side facing the FR direction) of the display module (110). In one embodiment, the first cover (121) may have an opening formed on the inside. One side (e.g., the front side) of the display module (110) may be visible from the outside through the opening of the first cover (121). In one embodiment, the first cover (121) may be arranged to surround an edge of the display module (110). The first cover (121) may be referred to as a front cover or a front housing.

[0045] According to one embodiment, the second cover (122) may cover one side (e.g., the rear side) (e.g., the side facing the R direction) of the display module (110). When the first cover (121) and the second cover (122) are combined, a space may be formed between the first cover (121) and the second cover (122) to accommodate components of the display device (100), such as the display module (110). The covers (121, 122) may protect components of the display device (100), including the display module (110) accommodated in the space, from the outside. The second cover (122) may be called a rear cover or a rear housing.

[0046] According to one embodiment, one side (e.g., the rear) of the second cover (122) may be provided with one or more fastening portions (123) to which a stand (130) is coupled. In one embodiment, the fastening portions (123) may be positioned adjacent to the lower end of the second cover (122).

[0047] According to one embodiment, the fastening portions (123) may be provided in at least one pair. In one embodiment, at least one pair of fastening portions (123) may be arranged to be spaced apart from each other along the length direction of the display device (100) (e.g., parallel to the long side of the second cover (122)) along the lower end of the second cover (122). In one embodiment, at least one pair of fastening portions (123) may be arranged to be symmetrical with respect to the center line (CL) of the second cover (122). Here, the center line (CL) may be a vertical line passing through the center of the display device (100).

[0048] According to one embodiment, the fastening portion (123) may be recessed from one side (e.g., the rear side) of the second cover (122) to form a receiving space (1231) in which at least a portion of the stand (130) is received.

[0049] In one embodiment, the fastening member (123) may include at least one pair of fastening ribs (1233), each of which includes a fastening hole (1234) into which at least a portion of a fastening projection (134) of a stand (130) to be described later is inserted. In one embodiment, each pair of fastening ribs (1233) may be spaced apart from each other in the vertical direction along both sides (1232) of the second cover (122).

[0050] According to one embodiment, the fastening rib (1233) may protrude from one side (1232) of the second cover (122). In one embodiment, each of the pair of fastening ribs (1233) may be provided on each of the two side surfaces (1232) that are parallel to the short side of the second cover (122) among the several side surfaces of the fastening portion (123) defining the receiving space (1231). In one embodiment, each of the pair of fastening ribs (1233) may be arranged to face each other on each of the two side surfaces (1232) of the second cover (122).

[0051] According to one embodiment, one side of the fastening rib (1233) facing the fastening rib (1233) positioned on the opposite side may be open to form a fastening hole (1234). By inserting the fastening protrusion (134) of the stand (130) into the fastening hole (1234) of each fastening rib (1233), the stand (130) may be coupled to the second cover (122).

[0052] According to one embodiment, the stand (130) may be configured to support a display assembly (or display body) including a display module (110) and a cover (120). The display assembly may be a combination (or assembly) of the display module (110) and the cover (120).

[0053] According to one embodiment, the number of stands (130) may correspond to the number of fastening parts (123) of the second cover (122). For example, the stand (130) may include at least two stands (130a, 130b). The two or more stands (130a, 130b) may be arranged symmetrically with respect to the center line (CL) of the second cover (122).

[0054] According to one embodiment, the stand (130) may include a base (131), a support (132), a fastening plate (133) and at least one pair of fastening protrusions (134).

[0055] According to one embodiment, the base (131) may be placed on an installation surface of the display device (100), such as the ground. In one embodiment, the base (131) may have an overall hexahedral shape, but the present disclosure is not limited thereto.

[0056] According to one embodiment, the support member (132) may extend obliquely from the upper surface of the base (131). The support member (132) may be coupled to one surface (e.g., the rear surface) of the fastening plate (133).

[0057] In one embodiment, the fastening plate (133) may have a flat shape. In one embodiment, the fastening plate (133) may be coupled to one side (e.g., the front side) of the support portion (132). For example, the fastening plate (133) may be coupled to one side opposite to the fastening plate (133) to which the support portion (132) is coupled. In one embodiment, the width and / or length of the fastening plate (133) may be substantially the same as the width and / or length of the fastening portion (123) of the second cover (122).

[0058] According to one embodiment, each of at least one pair of fastening protrusions (134) may be arranged on both front edges of the fastening plate (133). In one embodiment, each fastening protrusion (134) may include a first part (1341) protruding from the front of the fastening plate (133) and a second part (1342) extending from the first part (1341) in a direction perpendicular to the longitudinal direction of the fastening plate (133). The stand (130) may be coupled to the second cover (122) by inserting each of the second parts (1342) of the at least one pair of fastening protrusions (134) into a fastening hole (1234) of a corresponding fastening rib (1233).

[0059] Hereinafter, with reference to FIGS. 6 to 12, an injection mold device (200) for injection molding a second cover (122) (hereinafter, rear cover) of a display device (100) will be described.

[0060] FIG. 6 is an exploded perspective view of an injection mold device according to one embodiment of the present disclosure.

[0061] FIG. 7 is a vertical cross-sectional view of an injection mold device according to one embodiment of the present disclosure.

[0062] FIG. 8 is an enlarged view of portion C of FIG. 7 according to one embodiment of the present disclosure.

[0063] FIG. 9 is a portion of a horizontal cross-sectional view of an injection mold apparatus according to one embodiment of the present disclosure.

[0064] Referring to FIGS. 6 to 9, an injection mold device (200) according to one embodiment can form a rear cover (122) of a display device (e.g., the display device (100) of FIGS. 1 to 3) by injecting (or injecting) resin therein and cooling and solidifying the injected resin.

[0065] According to one embodiment, the injection molding device (200) may include a first mold portion (210) and a second mold portion (220) coupled to the first mold portion (210).

[0066] According to one embodiment, the first mold part (210) may be configured to be movable in a direction away from (e.g., in the +Z-axis direction) or toward (e.g., in the -Z-axis direction) the second mold part (220). For example, the first mold part (210) may open the second mold part (220) by moving away from the second mold part (220). For example, the first mold part (210) may close the second mold part (220) by moving toward the second mold part (220). The first mold part (210) may be referred to as a movable mold part.

[0067] According to one embodiment, the first mold portion (210) may include a first mold base (211), a first mold (212) coupled to one side (e.g., in the -Z-axis direction) of the first mold base (211), and at least one pair of insert blocks (213) disposed at the bottom of the first mold (212). The first mold (212) may be referred to as an upper mold, a cavity body, or a first mold body. The insert blocks (213) may be referred to as an insert cavity.

[0068] According to one embodiment, the first mold (212) may include a first molded portion (2121) having a shape corresponding to the outer surface (122a) of the rear cover (122) of the display device. In one embodiment, the first molded portion (2121) may be provided concavely so as to have a shape corresponding to the outer surface (122a) of the rear cover (122) of the display device.

[0069] According to one embodiment, the insert block (213) may protrude from the lower portion of the first mold (212). The insert block (213) may be provided integrally with the first mold (212), but the present disclosure is not limited thereto. In one embodiment, the insert block (213) may be positioned at a position facing the recessed portion (223) of the second mold (222) when the injection mold device (200) is closed. In one embodiment, at least one pair of insert blocks (213) may be spaced apart from each other along the longitudinal direction (e.g., ±Y-axis direction) of the first molding portion (2121). In one embodiment, each of the at least one pair of insert blocks (213) may be arranged symmetrically with respect to the center of the first mold (212).

[0070] According to one embodiment, the second mold portion (220) may have a fixed structure that does not move, unlike the first mold portion (210). The second mold portion (220) may be referred to as a fixed-side mold portion.

[0071] According to one embodiment, the second mold portion (220) may include a second mold base (221), a second mold (222) coupled to one side (e.g., in the +Z-axis direction) of the second mold base (221), at least one pair of recessed portions (223) for receiving at least a portion of the first mold (212) (e.g., at least a portion of the insert block (213)) during an injection process, and at least one pair of slide cores (224) seated in the at least one pair of recessed portions (223). The second mold (222) may be referred to as a lower mold, a core body, or a second mold body. The slide core (224) may be referred to as an insert core.

[0072] According to one embodiment, the second mold (222) may include a second molded portion (2221) having a shape corresponding to the inner surface (122b) of the rear cover (122) of the display device. In one embodiment, the second molded portion (2221) may be provided convexly so as to have a shape corresponding to the inner surface (122b) of the rear cover (122) of the display device.

[0073] According to one embodiment, the recessed portion (223) is positioned adjacent to the lower end of the second molding portion (2221) and may be recessed from one surface (e.g., a surface facing the +Z-axis direction) of the second mold (222). In one embodiment, the recessed portion (223) may form a space in which the slide core (224) is seated. In one embodiment, at least a portion of the first mold (212) (e.g., a lower portion of the insert block (213)) may be inserted into the recessed portion (223) during the injection process. In one embodiment, at least one pair of recessed portions (223) may be spaced apart from each other along the longitudinal direction (e.g., the ±Y-axis direction) of the second molding portion (2221). In one embodiment, each of the pair of recessed portions (223) may be arranged symmetrically with respect to the center of the second mold (222).

[0074] According to one embodiment, the slide core (224) may be coupled to the recessed portion (223). In one embodiment, the slide core (224) may include a slide body (2241) and a slider (2243) slidably provided on the inside of the slide core body (2241). Hereinafter, the shape, structure, and / or operation of the slide core (224) will be described with reference to FIGS. 10 to 13A.

[0075] According to one embodiment, the slide core (224) and the insert block (213) may be provided to form a fastening portion (123) for coupling with a stand (e.g., stand (130) of FIG. 3) in the rear cover (122) of the display device (100) during the injection process.

[0076] In one embodiment, the slide core (224) may be arranged to form an inner surface (e.g., a surface facing the -Z axis) of the fastening portion (123) of the rear cover (122) during the injection process. In one embodiment, the slide core (224) may include at least one pair of first fastening rib forming portions (22433) for forming fastening ribs (e.g., fastening ribs (1233) of FIG. 5) of the fastening portion (123).

[0077] According to one embodiment, the insert block (213) may be provided to form an outer surface (e.g., a surface facing the +Z axis) of the fastening portion (123) of the rear cover (122) during the injection process. According to one embodiment, the insert block (213) may be formed at a lower portion of the insert block (213) and may include at least one pair of second fastening rib forming portions (2131) that are recessed across a lower surface (e.g., a surface facing the -Z axis) of the insert block (213) and one side (e.g., one of the surfaces facing the ±Y axis) connected to the lower surface. In one embodiment, the second fastening rib forming portions (2131) may be arranged to surround the first fastening rib forming portions (22433) of the slide core (224) when the injection mold device (200) is closed.

[0078] When the injection mold device (200) is closed, a gap (s) into which resin is injected (or, injected) may be formed between the first mold (212) and the second mold (222). During the injection process, the resin flows into the gap (s) and is hardened, thereby forming the outer surface (112a) and the inner surface (112b) of the rear cover (112). For example, during the injection process, the resin flowing into the gap (s) along the lower surface (212a) of the first mold (212) and the surface of the insert block (213) can form the outer surface of the fastening portion (123) for joining the stand (130), and the resin flowing into the gap (s) along the upper surface (222a) of the second mold (222) and the surface of the slide core (224) can form the inner surface of the fastening portion (123) for joining the stand. In addition, since no resin flows into the portion where the first fastening rib forming portion (22433) of the slide core (224) and the second fastening rib forming portion (2131) of the insert block (213) come into contact during the injection process, a fastening hole (e.g., fastening hole (1234) of FIG. 4) into which at least a portion of the fastening protrusion of the stand (e.g., fastening protrusion (134) of FIG. 4) is inserted can be formed.

[0079] According to one embodiment, the injection molding device (200) may include a heating device (not shown). In one embodiment, the heating device may be provided in each of the first mold portion (210) and the second mold portion (220), but the present disclosure is not limited thereto. The heating device may control the temperatures of the first mold portion (210) and the second mold portion (220) differently. For example, the heating device may control the temperature of the first mold portion (210) to a high temperature (e.g., 85°C) to improve the quality of the outer surface (122a) of the rear cover (122) of the display device (100). For example, the heating device may control the temperature of the second mold portion (220) to a low temperature (e.g., 49°C) to cool the rear cover (122) of the display device (100).

[0080] When the injection mold device (200) is heated by the heating device, the first mold part (210) and / or the second mold part (220) may be thermally expanded in a direction away from the center (e.g., CP) of each mold (212, 222) (e.g., in a direction parallel to the center line (e.g., CL1, CL2)).

[0081] FIG. 10 is a perspective view of a slide core according to one embodiment of the present disclosure.

[0082] FIG. 11 is an exploded perspective view of a slide core according to one embodiment of the present disclosure.

[0083] FIG. 12 is an enlarged view of a portion of a cross-sectional view of an injection molding device according to one embodiment of the present disclosure.

[0084] According to one embodiment, the configuration of the slide core (224) of FIGS. 10 to 12 may be all or part of the same as the configuration of the slide core (224) of FIGS. 6 to 9.

[0085] The embodiments illustrated in FIGS. 10 to 12 can be optionally combined with the embodiments of FIGS. 6 to 11.

[0086] Referring to FIGS. 10 and 11, a slide core (224) according to one embodiment may include a slide core body (2241) and at least one slider (2243) slidably disposed on the inside of the slide core body (2241).

[0087] According to one embodiment, the slide core body (2241) can be seated in a recessed portion (e.g., the recessed portion (223) of FIG. 6) of a second mold (e.g., the second mold (222) of FIG. 6). The slide core body (2241) can be fixed to the second mold (222) through a fastening member such as a bolt.

[0088] According to one embodiment, the inner side of the slide core body (2241) may include a first recess (22411) for forming a fastening portion (e.g., fastening portion (123) of FIG. 3) of a rear cover (e.g., rear cover (122) of FIG. 3) of a display device (e.g., display device (100) of FIGS. 1 and 2), and a second recess (22412) for accommodating a slider (2243).

[0089] According to one embodiment, the recess (22411) may be recessed from one side facing the insert block (e.g., the insert block (213) of FIG. 7) when the injection mold device (e.g., the injection mold device (200) of FIG. 7) is closed, and may extend along the length direction of the slide core body (2241).

[0090] In one embodiment, the second recess (22412) may be provided to have a step with respect to the first recess (22411). For example, the second recess (22412) may be recessed more deeply into one surface of the slide core body (2241) than the first recess (22411).

[0091] In one embodiment, the second recess (22412) may penetrate both sides of the slide core body (2241) and extend along the width direction of the slide core body (2241). In one embodiment, the second recess (22412) may include a first open end (22412a) open to one side of the slide core body (2241) and a second open end (22412b) open to the other side of the slide core body (2241). The slider (2243) may be slidably disposed on the inside of the slide core body (2241) through the open ends (22412a, 22412b) of the second recess (22412). The second recess (22412) may be referred to as a slider receiving portion (22412). The opening position of the first open end (22412a) may be in a direction away from the center of the second mold (222) (or in the direction of thermal expansion), and the opening position of the second open end (22412b) may be in a direction approaching the center of the second mold (222) (or in the opposite direction of thermal expansion). In the slide core (224), the formation positions of the first open end (22412a) and the second open end (22412b) may be reversed depending on whether the slide core (224) is arranged to the left or right with respect to the center line (CL1) of the second mold body (222).

[0092] According to one embodiment, the second recesses (22412a, 22412b) may be provided in multiple numbers. For example, the number of second recesses (22412) may correspond to the number of sliders (2243), and may be spaced apart from each other along the length direction of the slide core body (2241).

[0093] According to one embodiment, the slider (2243) may include a slider body (22431), a pair of side walls (22432) spaced apart from each other at an edge of the slider body (22431), and at least one pair of first fastening rib forming portions (22433) provided on each of the pair of side walls (22432). In one embodiment, a plurality of sliders (2243a, 2243b) may be provided, and may be movably arranged in each of the corresponding second recesses (22412).

[0094] In one embodiment, the slider body (22431) may have a plate shape overall. In one embodiment, the slider body (22431), when received in the second recess (22412), may form a plane identical to the surface of the slide core body (2241) together with a pair of side walls (22432).

[0095] In one embodiment, each of a pair of side walls (22432) may protrude from an edge of the slider body (22431). In one embodiment, each of the side walls (22432) may have a shape corresponding to the open ends (22412a, 22412b).

[0096] According to one embodiment, at least one pair of first fastening rib forming portions (22433) may protrude from each of one side of a pair of opposing side walls (22432). At least one pair of first fastening rib forming portions (22433) may be spaced apart along the length direction of the pair of side walls (22432).

[0097] Fig. 12 is an enlarged view of a portion of a vertical cross-section of the injection mold device (200) when the injection mold device (100) is closed.

[0098] Fig. 12 is a drawing created based on a slide core (224) placed on the left side (e.g., in the +Y-axis direction) of the center line (CL1) of the second mold portion (220) of Fig. 6.

[0099] Referring to FIG. 12, the slider (2243) of the slide core (224) can be slidably arranged in the second recess (22432) of the slide core body (22431). Although not specified in the drawing, one end of the slider (2243) accommodated in the second recess (22432) can be spaced apart from one surface of the recess (223) of the adjacent second mold (222). In this case, a gap (g) can be formed between one end of the slider (2243) and one surface of the recess (223). The gap (g) can be located within the first open end (22412a) of the second recess (223). For example, a gap (g) may be provided in one of the open ends (22412a, 22412b) that is located far from the center of the second mold (222) (e.g., the first open end (22412a)). The gap (g) may be designed by taking into account the difference in thermal expansion values ​​between the molds as a spare space for compensating for the difference in thermal expansion values ​​due to the temperature difference between the first mold part (210) and the second mold part (220). The gap (g) may be referred to as a thermal expansion gap.

[0100] FIG. 13a is an enlarged view of portion D shown in FIG. 12 according to one embodiment of the present disclosure.

[0101] Figure 13b is an enlarged view of a portion of a cross-sectional view of an injection mold device according to a comparative example of the present disclosure.

[0102] Figures 13a and 13b are drawings created based on the slide core (224) positioned on the left side (e.g., in the +Y-axis direction) of the center line (CL1) of the second mold portion (220) of Figure 6.

[0103] FIG. 13a is a drawing showing the thermal expansion of the insert block (213) and the movement of the slider (2243) corresponding to the thermal expansion of the insert block (213) when a difference in thermal expansion values ​​occurs between the molds as the temperature of the first mold part (210) is controlled to be higher than the temperature of the second mold part (220) by a heating device (not shown).

[0104] FIG. 13b is a drawing showing a comparative example for explaining a phenomenon in which a part (22433) of the second mold part (220a) that was previously in contact with the lower portion of the insert block (213) is pressed or lifted due to the difference in thermal expansion value when a difference in thermal expansion value occurs between the molds as the temperature of the first mold part (210) is controlled to be higher than the temperature of the second mold part (220a) by a heating device.

[0105] According to one embodiment, the injection mold device of FIG. 13a (e.g., the injection mold device (200) of FIG. 6) may include a first mold portion (210) and a second mold portion (220). According to one embodiment, the injection mold device of FIG. 13b (e.g., the injection mold device (200) of FIG. 6) may include a first mold portion (210) and a second mold portion (220a).

[0106] The configuration of the first mold portion (210) of FIGS. 13a and 13b may be all or partly identical to the configuration of the first mold portion (210) of FIGS. 6 and 7. The configuration of the second mold portion (220, 220a) of FIGS. 13a and 13b may be all or partly identical to the configuration of the second mold portion (220) of FIGS. 6 and 7.

[0107] The embodiment illustrated in FIG. 13a can be optionally combined with the embodiments of FIGS. 6 to 12.

[0108] Referring to FIG. 13a, when the temperature of the first mold portion (e.g., the first mold (212) and / or the insert block (213)) is set higher than the temperature of the second mold portion (e.g., the second mold (222) and / or the slide core (224)) by the heating device, the lower portion of the insert block (213) (e.g., the second fastening rib forming portion (2131)) is deformed (or expanded) in a direction away from the center of the injection mold device (e.g., DR1). At this time, the first fastening rib forming portion (22433) of the slider (2243) comes into contact with the deformed (or expanded) second fastening rib forming portion (2131), and thus moves in the deformation direction (e.g., DR1) of the second fastening rib forming portion (2131) due to an external force resulting from the contact (e.g., a force causing deformation of the second fastening rib forming portion (2131). The slider (2243) moves to eliminate the thermal expansion gap (e.g., gap (g) in Fig. 12), thereby compensating for the thermal expansion value due to the temperature difference.

[0109] Referring to FIG. 13b, the second mold part (220a) of FIG. 13b has a structure in which, during an injection process, a part (e.g., a first fastening rib forming part (22433a)) comes into contact with the insert block (213) to form a fastening part (e.g., a fastening part (123) of FIG. 3) of a rear cover (e.g., a rear cover (122) of FIG. 3), but unlike the second mold part (220) of FIG. 13a, it does not have a movable structure such as a slider (2243). In the structure of the second mold portion (220a) of FIG. 13b, when the temperature of the first mold portion (e.g., the first mold (212) and / or the insert block (213)) is set higher than the temperature of the second mold portion (220a) by the heating device, the lower portion of the insert block (213) (e.g., the second fastening rib forming portion (2131)) is deformed (or expanded) in a direction away from the center of the injection mold device (e.g., DR1).

[0110] At this time, looking at the area (P1) that is relatively far from the center of the second mold portion (220a) based on the insert block (213), the first fastening rib forming portion (22433a) of the second mold portion (220a) comes into contact with the second fastening rib forming portion (2131) that is deformed (or expanded). However, due to the difference in thermal expansion values ​​of the fastening rib forming portions (2131a, 22433a) caused by the temperature difference, excessive pressing (or denting) occurs between the molds in the area (P1), thereby causing damage (e.g., wear, denting) to the molds.

[0111] In addition, when looking at the area (P2) relatively close to the center of the second mold portion (220a) based on the insert block (213), the first fastening rib forming portions (22433b) of the second mold portion (220a) move apart from each other due to the difference in thermal expansion values ​​of the fastening rib forming portions (2131b, 22433b) caused by the temperature difference, and a gap is formed therebetween. When the gap is formed, a quality defect such as a flash (or burr) occurs in the fastening hole for fastening the stand during injection molding of the rear cover.

[0112] An injection mold device (200) for molding a rear cover (122) of a display device (100) according to one embodiment of the present disclosure may include a first mold portion (210) having a shape corresponding to a first surface (122a) of the rear cover (122). The injection mold device (200) may include a second mold portion (220) that is connectable with the first mold portion (210) and has a shape corresponding to a second surface (122b) opposite to the first surface (122a) of the rear cover (122). The first mold portion (210) may include a first mold body (212) and at least one pair of insert cavities (213) protruding from a lower portion of the first mold body (212). The second mold part (220) may include a second mold body (222) including at least one pair of recessed portions (223) that accommodate at least a portion of each of the insert cavities (213) when the injection mold device (200) is closed. The second mold part (220) may include at least one pair of slide cores (224) that include sliders (2243) that are arranged to surround at least a portion of the insert cavities (213) accommodated in the recessed portions (223) when the injection mold device (200) is closed and are configured to be movable while in contact with portions (2131) of both sides of the insert cavities (213).

[0113] According to one embodiment, the injection molding device (200) may include a heating device configured to control the temperature of the first mold portion (210) and the second mold portion (220).

[0114] According to one embodiment, the heating device may be configured to heat the first mold part (210) and the second mold part (220) to different temperatures during the injection process.

[0115] According to one embodiment, the heating device can heat the first mold part (210) to a higher temperature than the second mold part (220) during the injection process. Each of the insert cavities (213) can be expanded in a direction away from the center of the injection mold device (200) by the heating device. Each of the sliders (2243) can maintain contact with the insert cavity (213) and move along the direction in which the insert cavity (213) is expanded.

[0116] According to one embodiment, the first mold part (210) can move along a first direction for opening and closing the second mold part (220). The slider (2243) can be provided to move along a second direction perpendicular to the first direction.

[0117] According to one embodiment, the at least one pair of recessed portions (223) may be positioned adjacent to an edge of the second mold body (222) and spaced apart from each other along the edge of the second mold body (222).

[0118] According to one embodiment, each of the at least one pair of recessed portions (223) may be arranged symmetrically with respect to a center line (CL1) passing through the center of the second mold body (222).

[0119] According to one embodiment, the slide core (224) may include a slide core body (2241) and a slider receiving portion (22412) penetrating the slide core body (2241) and having open ends (22412a, 22412b) so that the slider (2243) can be inserted.

[0120] According to one embodiment, one end of the slider (2243) may be spaced apart from one surface of the recessed portion (223) facing the center line (CL1) passing through the center of the second mold body (222) to form a predetermined gap (g).

[0121] According to one embodiment, the gap (g) may be designed by considering the difference in thermal expansion values ​​of the first mold part (210) and the second mold part (220) when the temperature of the first mold part (210) is higher than the temperature of the second mold part (220).

[0122] According to one embodiment, the slider (2243) may include a slider body (22431) and a pair of side walls (22432) that protrude from opposite edges of the slider body (22431) and face each other.

[0123] According to one embodiment, each of the side walls (22432) may include a first fastening rib forming portion (22433) protruding from a surface facing the adjacent other side wall (22432) and having one surface in contact with the insert cavity (213).

[0124] According to one embodiment, one surface of the first fastening rib forming portion (22433) in contact with the insert cavity (213) may be an inclined surface.

[0125] According to one embodiment, the insert cavity (213) may include a second fastening rib forming portion (2131) surrounding the first fastening rib forming portion (22433) and having one surface in contact with the first fastening rib forming portion (22433).

[0126] According to one embodiment, one surface of the second fastening rib forming portion (2131) that comes into contact with the first fastening rib forming portion (22433) may be an inclined surface.

Claims

1. In an injection mold device (200) for molding a rear cover (122) of a display device (100), A first mold portion (210) having a shape corresponding to the first surface (122a) of the rear cover (122); and It includes a second mold part (220) that is combineable with the first mold part (210) and has a shape corresponding to a second surface (122b) opposite to the first surface (122a) of the rear cover (122), The above first mold part (210) is A first mold body (212); and at least one pair of insert cavities (213) protruding from the lower portion of the first mold body (212), The above second mold part (220) is When the injection mold device (200) is closed, a second mold body (222) including at least one pair of recessed portions (223) that accommodate at least a portion of each of the insert cavities (213); and An injection mold device comprising at least one pair of slide cores (224) arranged to surround at least a portion of the insert cavity (213) accommodated in the recessed portion (223) when the injection mold device (200) is closed, and including a slider (2243) configured to be movable while in contact with a portion (2131) of both sides of the insert cavity (213).

2. In paragraph 1, An injection molding device comprising a heating device configured to control the temperature of the first mold portion (210) and the second mold portion (220).

3. In paragraph 2, An injection mold device, wherein the heating device is configured to heat the first mold part (210) and the second mold part (220) to different temperatures during an injection process.

4. In paragraph 2, The above heating device heats the first mold part (210) to a higher temperature than the second mold part (220) during the injection process, Each of the above insert cavities (213) is expanded in a direction away from the center of the injection mold device (200) by the heating device, An injection mold device in which each of the above sliders (2243) maintains contact with the insert cavity (213) and moves along the direction in which the insert cavity (213) expands.

5. In any one of paragraphs 1 to 4, The first mold part (210) moves along the first direction for opening and closing the second mold part (220), An injection mold device in which the above slider (2243) is provided to be movable along a second direction perpendicular to the first direction.

6. In any one of paragraphs 1 to 5, At least one pair of recessed portions (223) above, An injection mold device, which is positioned adjacent to the edge of the second mold body (222) and spaced apart from each other along the edge of the second mold body (222).

7. In any one of paragraphs 1 to 6, Each of the above at least one pair of recessed portions (223) An injection mold device arranged symmetrically with respect to a center line (CL1) passing through the center of the second mold body (222).

8. In any one of paragraphs 1 to 7, The above slide core (224) is Slide core body (2241); and An injection mold device comprising a slider receiving portion (22412) penetrating the slide core body (2241) and having open ends (22412a, 22412b) so that the slider (2243) can be inserted.

9. In paragraph 8, One end of the above slider (2243) is An injection mold device that forms a predetermined gap (g) by being spaced apart from one surface of the recessed portion (223) facing the center line (CL1) passing through the center of the second mold body (222).

10. In paragraph 9, An injection mold device in which the above gap (g) is designed in consideration of the difference in thermal expansion values ​​of the first mold part (210) and the second mold part (220) when the temperature of the first mold part (210) is higher than the temperature of the second mold part (220).

11. In any one of paragraphs 1 to 10, The above slider (2243) is, Slider body (22431); and An injection mold device comprising a pair of side walls (22432) protruding from both edges of the slider body (22431) and facing each other.

12. In paragraph 11, An injection mold device, wherein each of the side walls (22432) includes a first fastening rib forming portion (22433) protruding from a surface facing the adjacent other side wall (22432) and having one surface in contact with the insert cavity (213).

13. In paragraph 12, An injection mold device, wherein one surface of the first fastening rib forming portion (22433) in contact with the above insert cavity (213) is an inclined surface.

14. In paragraph 12 or 13, An injection mold device, wherein the insert cavity (213) surrounds the first fastening rib forming portion (22433) and includes a second fastening rib forming portion (2131) having one surface that contacts the first fastening rib forming portion (22433).

15. In paragraph 14, An injection mold device, wherein one surface of the second fastening rib forming portion (2131) in contact with the first fastening rib forming portion (22433) is an inclined surface.

Images