Hot pressing jig and hot pressing method

Abstract

The hot-pressing jig is used for preparing a front light guide plate, the hot-pressing jig comprises a light guide plate limiting plate and an anti-sticking supporting device, the light guide plate limiting plate is provided with a limiting surface, the anti-sticking supporting device is arranged on the limiting surface, the anti-sticking supporting device comprises a plurality of anti-sticking spacing devices, and the anti-sticking spacing devices are arranged on the limiting surface. The multiple anti-sticking distance pieces are arranged in the direction away from the light guide plate limiting plate, a first material containing cavity is formed between the anti-sticking distance piece adjacent to the light guide plate limiting plate and the light guide plate limiting plate, and a second material containing cavity is formed between any two adjacent anti-sticking distance pieces. The first material containing cavity and the second material containing cavity are both used for containing front light guide plate blanks, the first material containing cavity is provided with a first hot-pressing port, the second material containing cavity is provided with a second hot-pressing port, and the first hot-pressing port and the second hot-pressing port are located on the same side. The invention further discloses a hot pressing assembly, a front light guide plate hot pressing method and a front light guide plate.

Description

Technical Field

[0001] The invention relates to the field of optical element manufacturing, and in particular to a hot pressing jig, a hot pressing assembly, a hot pressing method for a front light guide plate, and a front light guide plate. Background Art

[0002] The existing hot pressing process for the front light guide plate usually adopts a single-piece hot pressing method, which makes it difficult to achieve efficient hot pressing of multiple thin plates at the same time, and this method is inefficient.

[0003] In addition, when multiple thin plates are stacked and hot-pressed, problems such as adhesion and deformation may occur on the hot-pressed surface, resulting in poor overall performance of the multiple front light guide plates prepared by hot-pressing, affecting the quality of subsequent screens. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to a certain extent. To this end, the present invention provides a hot pressing jig, a hot pressing assembly, a hot pressing method for a front light guide plate, and a front light guide plate.

[0005] In order to achieve the above-mentioned purpose, as a first aspect of the present invention, a hot pressing jig is provided, which comprises a light guide plate limit plate and an anti-sticking support device, wherein the light guide plate limit plate has a limit surface, and the anti-sticking support device is arranged on the limit surface, and the anti-sticking support member comprises a plurality of anti-sticking spacers, and the plurality of anti-sticking spacers are arranged in a direction away from the light guide plate limit plate, and a first material holding cavity is formed between the anti-sticking spacers adjacent to the light guide plate limit plate and the light guide plate limit plate, and a second material holding cavity is formed between any two adjacent anti-sticking spacers, and both the first material holding cavity and the second material holding cavity are used to accommodate the front light guide plate blank, and the first material holding cavity has a first hot pressing port, and the second material holding cavity has a second hot pressing port, and the first hot pressing port and the second hot pressing port are located on the same side.

[0006] Furthermore, the height of the first material containing cavity and the height of the second material containing cavity match the thickness of the front light guide plate blank.

[0007] Furthermore, the height of the first material containing cavity and the height of the second material containing cavity are between 0.1 mm and 0.7 mm.

[0008] Furthermore, the anti-adhesion support device includes a first anti-adhesion support device and a second anti-adhesion support device, the first anti-adhesion support device is arranged opposite to the second anti-adhesion support device, the multiple anti-adhesion spacers (121) include multiple first anti-adhesion spacers and multiple second anti-adhesion spacers, the first anti-adhesion spacer is arranged on the first anti-adhesion support device (12a), the second anti-adhesion spacer is arranged on the second anti-adhesion support device (12b), and the first anti-adhesion spacer corresponds to the second anti-adhesion spacer one by one.

[0009] Further, the anti-sticking spacer includes a transverse limiting member and a longitudinal limiting member, the longitudinal limiting member is arranged on a side of the transverse limiting member close to the second material containing cavity, the thickness of the transverse limiting member is greater than the thickness of the longitudinal limiting member, so that the anti-sticking spacer has a step structure, in which the transverse limiting member is used to limit the front light guide plate blank in the transverse direction;

[0010] The longitudinal limiter includes a first surface and a second surface relative to each other, the first surface and / or the second surface corresponds to the limiter surface, the first surface and / or the second surface contacts the front light guide plate blank, and the longitudinal limiter is used to longitudinally limit the front light guide plate blank.

[0011] Furthermore, the thickness of the anti-adhesive spacer satisfies the following formula:

[0012] D = d + h;

[0013] Wherein, D is the thickness of the anti-adhesive spacer, and D is greater than or equal to 0.3 mm;

[0014] d is the thickness of the longitudinal limiter, which is greater than or equal to 0.15 mm;

[0015] h is the height of the second material holding cavity.

[0016] Furthermore, the hot pressing jig also includes an anti-scratch member, which is arranged on the surface of the anti-sticking spacer on the side away from the light guide plate limiting plate, and the anti-scratch member is used to contact the surface of the front light guide plate blank.

[0017] Furthermore, the hot pressing jig further comprises a bottom plate, which is arranged at the bottom of the hot pressing jig, and a third material holding cavity is formed between the bottom plate and the adjacent anti-sticking spacer.

[0018] As a second aspect of the present invention, a hot pressing assembly is disclosed, including a hot pressing jig and a pressing head, wherein the hot pressing jig is the hot pressing jig mentioned above, and the pressing head is arranged on one side close to the first hot pressing port and / or the second hot pressing port of the hot pressing jig.

[0019] As a third aspect of the present invention, a hot pressing method for a front light guide plate is disclosed, comprising:

[0020] Stacking multiple pieces of front light guide plate blanks and placing them into a hot pressing jig, the hot pressing jig is the above-mentioned hot pressing jig, wherein the front light guide plate blanks are arranged in the first material holding cavity and / or the second material holding cavity, and any two adjacent front light guide plate blanks are separated by the anti-sticking spacer, so that there is a gap between the adjacent front light guide plate blanks, and the size of the front light guide plate blanks along the depth direction of the hot pressing jig is greater than the depth of the hot pressing jig, so that the front light guide plate blanks protrude from the hot pressing jig through the first hot pressing port and / or the second hot pressing port, exposing the end face of the front light guide plate blanks for hot pressing;

[0021] The front light guide plate blank is hot-pressed by using a pressing head to obtain the front light guide plate, wherein the pressing head hot-presses the front light guide plate blank through the first hot-pressing port and / or the second hot-pressing port.

[0022] Furthermore, a protruding dimension of the front light guide plate blank protruding from the hot pressing jig is between 0.5 mm and 2 mm.

[0023] Furthermore, the hot pressing of the front light guide plate blank by using a pressing head includes hot rolling and / or hot flat pressing.

[0024] As a fourth aspect of the present invention, a front light guide plate is disclosed. The front light guide plate is manufactured by the above-mentioned hot pressing method, and the thickness of the front light guide plate is between 0.1 mm and 0.7 mm.

[0025] Beneficial effects of the present invention:

[0026] The hot pressing jig provided by the present invention is suitable for hot pressing multiple front light guide plate blanks together. The first and second material holding cavities formed by the light guide plate limit plate and the anti-sticking support device can stack and place multiple front light guide plate blanks for subsequent hot pressing of multiple pieces. The jig is set in an integral form for easy taking and storage. Multiple hot pressing jigs are stacked in advance to place multiple front light guide plate blanks waiting for hot pressing, which greatly shortens the preparation and fixing time before hot pressing and improves production efficiency.

[0027] The light guide plate limiting plate can withstand the external force used for fixing and evenly disperse the force during the hot pressing process, so that the multiple thin plates stacked in the fixture will not be deformed, contaminated or offset due to the local uneven external force. In addition, the light guide plate limiting plate has a limiting surface, and the deformation of the front light guide plate blank in the first material holding cavity during hot pressing can be limited by the limiting surface, thereby ensuring that the hot pressing end face is stable and not deformed, thereby improving the hot pressing effect;

[0028] An anti-sticking support device is provided in the jig, and the anti-sticking support device includes a plurality of anti-sticking spacers. The plurality of anti-sticking spacers that are micro-machined by precision machinery are laminated to form an integrated anti-sticking support device, which has higher dimensional accuracy and is more conducive to the storage and stacking of thin plates with precise dimensions. In addition, the integrated anti-sticking spacer has a greater fixed supporting force, avoiding a decrease in the supporting connection strength due to separation.

[0029] Multiple anti-sticking spacers can store multiple front light guide plate blanks, which can expand the number of stored sheets and improve production efficiency. The more anti-sticking spacers there are, the more sheets can be stored and the larger the fixture size is. On the one hand, the anti-sticking spacers are used to provide support, and on the other hand, they are used to fix the stored thin plates to prevent the thin plates from sliding to one side, squeezing to one side, or causing an incomplete and uneven hot pressing surface.

[0030] A second material holding cavity is formed between any two adjacent anti-sticking spacers, and the second material holding cavity is used to accommodate the front light guide plate blanks. The purpose is to separate the stacked multiple pieces of front light guide plate blanks by the anti-sticking spacers to create a gap between them. On the one hand, it can prevent the molten material between adjacent plates from sticking together due to the pressure of the molten raw material or the molten protective film pressure head generated when the subsequent pressing roller heats the pressure surface of the front light guide plate blanks. The anti-sticking spacers separate the formed molten materials from each other. On the other hand, the anti-sticking spacers stack the multiple pieces of front light guide plate blanks at intervals, so that the pressure of hot pressing is transferred from the original single-plate force-bearing surface to the force-bearing surface of multiple plates, and the force-bearing area is greatly increased, so that the pressure of hot pressing can be effectively and evenly distributed, so that the thin plate is not easily deformed during hot pressing, thereby improving the transfer effect.

[0031] The first material holding cavity has a first hot pressing port, and the second material holding cavity has a second hot pressing port, and the first hot pressing port and the second hot pressing port are located on the same side. Having the same hot pressing port enables the front light guide plate blank to be placed in the corresponding material holding cavity through the two ports, and ensures that the plate in the first material holding cavity and the plate in the second material holding cavity have the hot pressing surface on the same side, unifying the hot pressing and improving the hot pressing efficiency; on the other hand, it also makes the placement direction of the plate in the first material holding cavity correspond to that of the plate in the second material holding cavity, avoiding the plates in the two cavities from being placed at an inclined angle to each other, resulting in uneven force on the subsequent hot pressing surface;

[0032] The hot pressing jig of the present invention can also be used as a storage device to stack and place multiple pieces of front light guide plate blanks in advance to wait for hot pressing, which greatly shortens the preparation and fixing time before hot pressing. At the same time, it can also be used as a conveying device to convey multiple pieces of front light guide plate blanks; it can also be used as an interval fixing device to hot press multiple pieces of front light guide plate blanks at intervals to avoid melting and adhesion of the protective film, prevent deformation during hot pressing, improve the hot pressing effect, and enhance production efficiency.

[0033] The novel hot pressing jig and hot pressing method provided by the present invention can effectively improve the hot pressing efficiency of the front light guide plate blank, realize hot pressing of multiple pieces at the same time, greatly save costs, and at the same time, the front light guide plate obtained after hot pressing has good transfer effect and higher light guiding quality.

[0034] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present invention will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present invention. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings:

[0036] Figure 1 A front schematic diagram of an embodiment of the hot pressing jig provided by the present invention;

[0037] Figure 2 A front schematic diagram of another embodiment of the hot pressing jig provided by the present invention;

[0038] Figure 3 A front schematic diagram of one side of an embodiment of a hot pressing jig provided by the present invention;

[0039] Figure 4 A partially enlarged schematic diagram of the hot pressing jig provided by the present invention;

[0040] Figure 5 A schematic top view of an embodiment of the hot pressing jig provided by the present invention;

[0041] Figure 6 A front schematic diagram of an embodiment of a bottom plate of a hot pressing jig provided by the present invention;

[0042] Figure 7 A front schematic diagram of another embodiment of the hot pressing jig provided by the present invention;

[0043] Figure 8 A schematic top view of another embodiment of the hot pressing jig provided by the present invention.

[0044] Description of Reference Numerals

[0045] 1: Hot pressing fixture 3: Front light guide plate blank

[0046] 11: Light guide plate limit plate 111: First material holding cavity

[0047] 12: Anti-adhesion support device 12a: First anti-adhesion support device

[0048] 12b: Second anti-adhesion support device 121: Anti-adhesion spacer

[0049] 121a: lateral limiter 121b: longitudinal limiter

[0050] 122: Second material chamber 4: Bottom plate

[0051] 4a: Bolt 4b: Nut

[0052] 5: Anti-scratch parts DETAILED DESCRIPTION

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0054] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0055] It should be pointed out that in the present invention, "inner side" refers to the side closer to the object, and "outer side" refers to the side away from the object.

[0056] The inventors have found through research that the existing hot pressing process for front light guide plates usually adopts a single-piece hot pressing method, which makes it difficult to achieve efficient hot pressing of multiple thin plates at the same time, and this method is inefficient. In addition, when multiple thin plates are stacked for hot pressing, protective films are affixed to the upper and lower surfaces of each thin plate. When multiple thin plates are stacked for hot pressing, the protective film near the hot pressing surface is easy to melt, causing the lower protective film of the upper thin plate to stick to the upper protective film of the lower plate. With the trend of front light plates becoming thinner and thinner, the traditional hot pressing method of light guide plates is prone to problems such as deformation of the thin plate due to force and inability to transfer when applied to thinner PC thin plates. The above problems result in poor overall performance of multiple front light guide plates prepared by hot pressing, affecting the quality of subsequent screens.

[0057] As a first aspect of the present invention, a hot pressing jig is provided, which is used to prepare a front light guide plate, such as Figure 1 and Figure 2As shown, the hot pressing jig 1 includes a light guide plate limiting plate 11 and an anti-sticking support device 12, the light guide plate limiting plate has a limiting surface, the anti-sticking support device 12 is arranged on the limiting surface, the anti-sticking support device includes a plurality of anti-sticking spacers 121, the plurality of anti-sticking spacers 121 are arranged in a direction away from the light guide plate limiting plate 11, and a first material holding cavity 111 is formed between the anti-sticking spacers adjacent to the light guide plate limiting plate 11 and the light guide plate limiting plate 11, a second material holding cavity 122 is formed between any two adjacent anti-sticking spacers, the first material holding cavity and the second material holding cavity are both used to accommodate the front light guide plate blank 3, and the first material holding cavity has a first hot pressing port, the second material holding cavity has a second hot pressing port, and the first hot pressing port and the second hot pressing port are located on the same side.

[0058] The hot pressing jig provided by the present invention is suitable for hot pressing multiple front light guide plate blanks together. The first and second material holding cavities formed by the light guide plate limit plate and the anti-sticking support device can stack and place multiple front light guide plate blanks for subsequent hot pressing of multiple pieces. The jig is set in an integral form for easy taking and storage. Multiple hot pressing jigs are stacked in advance to place multiple front light guide plate blanks waiting for hot pressing, which greatly shortens the preparation and fixing time before hot pressing and improves production efficiency.

[0059] The light guide plate limiting plate 11 can withstand the external force used for fixing during the hot pressing process and evenly disperse the force, so that the multiple pieces of front light guide plate blanks 3 stacked in the jig will not be deformed, contaminated or offset due to local uneven external forces. In addition, the light guide plate limiting plate 11 has a limiting surface. The deformation of the front light guide plate blank 3 in the first material cavity during hot pressing can be limited by the limiting surface to ensure that the hot pressing end face is stable and not deformed, thereby improving the hot pressing effect. In the present application, the light guide plate limiting plate 11 can be a whole plate. Of course, the present application is not limited to this. The light guide plate limiting plate 11 can also be a plurality of connecting fixing rods for connecting relatively arranged anti-sticking spacers or a plurality of top plates arranged at intervals. In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the light guide plate limit plate includes a side portion and a middle portion, the side portion is connected to the anti-adhesion spacer, the middle portion is arranged in the middle of the side portion, the side portion extends toward the middle direction to form the middle portion, and the thickness of the middle portion along the height direction of the fixture is less than the thickness of the side portion. This arrangement can form a first material holding cavity between the light guide plate limit plate and the adjacent anti-adhesion spacer, and the blank placed in this space is the blank at the top of the hot pressing fixture. In some embodiments, the top view schematic diagram of the hot pressing fixture of the present invention is as follows: Figure 5 As shown, the light guide plate limiting plate 11 is a plate body with a rectangular or square structure, and its shape is suitable for the current front light guide plate blank, and the front light guide plate blank 3 can be perfectly inserted and placed in the hot pressing fixture.

[0060] An anti-sticking support device 12 is provided in the fixture, and the anti-sticking support device

[0061] It includes multiple anti-sticking spacers 121, and multiple anti-sticking spacers that are micro-machined by precision machinery are laminated into an integrated anti-sticking support device, which has higher dimensional accuracy and is more conducive to the storage of thin plates with precise stacking dimensions; in addition, the integrated anti-sticking spacer has a greater fixed supporting force, avoiding the decrease in supporting connection strength due to separation.

[0062] A plurality of anti-sticking spacers 121 can store a plurality of front light guide plate blanks 3, which can expand the number of sheets stored and improve production efficiency. The more anti-sticking spacers there are, the more sheets can be stored and the larger the size of the fixture. The anti-sticking spacers are used to provide support on the one hand and to fix the stored thin sheets on the other hand to prevent the thin sheets from sliding to one side, being squeezed to one side or causing an incomplete and uneven hot pressing surface.

[0063] A second material holding cavity 122 is formed between any two adjacent anti-sticking spacers 121. The second material holding cavity 122 is used to accommodate the front light guide plate blank 3. It is to enable the stacked multiple pieces of front light guide plate blank 3 to be separated by the anti-sticking spacer 121 and to have a gap between them. On the one hand, it can avoid the adhesion of the molten material between adjacent plates due to the pressure of the molten raw material or the molten protective film under the pressure of the pressure head when the front light guide plate blank is subsequently hot pressed. The anti-sticking spacer separates the formed molten materials from each other. On the other hand, the anti-sticking spacer 121 stacks the multiple pieces of front light guide plate blank 3 at intervals, so that the pressure of hot pressing is transformed from the original single-plate force-bearing surface to the force-bearing surface of multiple plates, and the force-bearing area is greatly increased, so that the pressure of hot pressing can be effectively and evenly distributed, so that the thin plate is not easily deformed during hot pressing, thereby improving the transfer effect.

[0064] The first material holding cavity 111 has a first hot pressing port, and the second material holding cavity 122 has a second hot pressing port, and the first hot pressing port and the second hot pressing port are located on the same side. Having the same hot pressing port enables the front light guide plate blank 3 to be placed in the corresponding material holding cavity through the two ports, and ensures that the front light guide plate blank 3 in the first material holding cavity 111 and the front light guide plate blank 3 in the second material holding cavity have the same hot pressing surface, unifying the hot pressing and improving the hot pressing efficiency; on the other hand, it also makes the placement directions of the front light guide plate blanks 3 in the first material holding cavity and the second material holding cavity correspond to each other, avoiding the inclined placement angle between the blanks in the two cavities, resulting in uneven force on the subsequent hot pressing surface;

[0065] The hot pressing jig of the present invention can also be used to stack and place multiple pieces of front light guide plate blanks in advance waiting for hot pressing, which greatly shortens the preparation and fixing time before hot pressing.

[0066] The present invention does not impose any special restrictions on the height of the first material cavity and the height of the second material cavity. It is only necessary to satisfy that the height of the first material cavity and the height of the second material cavity match the thickness of the front light guide plate blank. For example, the heights of the multiple second material cavities 122 are consistent. For another example, the heights may also be inconsistent. The material cavity is used for subsequent stacking and insertion of the front light guide plate blank. The height can be set according to the size of the thin plate. For example, if the thickness of the blank is 0.1mm, the height of the material cavity must be greater than the thickness of the blank, so that the blank can be inserted into the material cavity later. The height of the material cavity is preferably greater than 0.1mm; for another example, if the thickness of the blank is 0.4mm, the height of the material cavity is preferably greater than 0.4mm; for another example, if the thickness of the blank is 0.2mm, and the upper and lower surfaces of the blank are respectively provided with a 0.05mm protective film, the height of the material cavity is preferably greater than 0.3mm. Preferably, the height of the first material holding cavity and the second material holding cavity is between 0.1 mm and 0.7 mm. If the height is set too thin, the blank cannot be inserted and fixed, while if the height is too thick, the number of blanks that can be stacked and stored in the hot pressing fixture of the same size will be reduced, thereby reducing production efficiency and increasing production costs.

[0067] When multiple blanks are hot pressed, the anti-sticking spacers are set to prevent the protective films of adjacent blanks from melting and sticking, and evenly disperse the hot pressing force of the multiple blanks, so that the blanks are not easily deformed during hot pressing. Thinner and thinner front light plates can be produced to meet thickness requirements, and the transfer production process can be simplified and the efficiency of producing front light guide plates can be improved.

[0068] In the present disclosure, the anti-adhesion support device 12 includes a first anti-adhesion support device 12a and a second anti-adhesion support device 12b, the first anti-adhesion support device 12a is arranged opposite to the second anti-adhesion support device 12b, the plurality of anti-adhesion spacers 121 includes a plurality of first anti-adhesion spacers and a plurality of second anti-adhesion spacers, the first anti-adhesion spacers are arranged on the first anti-adhesion support device 12a, the second anti-adhesion spacers are arranged on the second anti-adhesion support device 12b, and the first anti-adhesion spacers correspond to the second anti-adhesion spacers one by one. That is, the anti-adhesion support devices can be a group arranged opposite to each other, wherein the anti-adhesion spacers are also arranged opposite to each other and correspond one by one, such as Figure 1 He Ru Figure 2 shown.

[0069] Of course, the present invention does not specifically limit the specific form of the anti-adhesion support device. The anti-adhesion support device can also be an integral part, that is, the first anti-adhesion support device 12a and the second anti-adhesion support device 12b are connected to form an integrated anti-adhesion support device. In this case, in addition to being relatively arranged, the anti-adhesion support device of the present invention also includes a back plate, and the back plate is also composed of a plurality of anti-adhesion spacers. The back plate connects the first anti-adhesion support device 12a and the second anti-adhesion support device 12b that are relatively arranged, and together with the light guide plate limit plate 11, a receiving cavity with a bottom opening and a side opening is formed. At the same time, the back plate also plays a role in fixing the end face of one side of the blank to reduce the deviation during hot pressing. The back plate can be a plate or a third anti-adhesion spacer, that is, it has anti-adhesion spacers with the first and second anti-adhesion spacers, and they correspond one to one.

[0070] Preferably, the anti-sticking spacers are arranged relative to each other and can serve as the clamping ends on both sides of the blank to clamp and fix the blank, thereby improving the fixing force of the hot pressing jig on multiple blanks, and preventing the blanks from shifting or sliding due to the shaking of the jig. At the same time, the blanks are easier to insert and stack in the jig.

[0071] like Figure 1 and Figure 2 As shown, the anti-sticking spacer 121 includes a transverse limiter 121a and a longitudinal limiter 121b. The longitudinal limiter 121b is arranged on the side of the transverse limiter 121a close to the second material holding cavity 122. The thickness of the transverse limiter 121a is greater than the thickness of the longitudinal limiter 121b, so that the anti-sticking spacer 121 has a step structure. In the step structure, the transverse limiter 121a is used to limit the front light guide plate blank laterally to prevent the blank from sliding and deviating to one side, avoiding extrusion to one side or causing uneven hot pressing surface; the transverse limiter preferably has a flat surface, so that the anti-sticking spacer device can relatively completely protect the blank in the jig, and when the blank is under pressure and contacts with the transverse limiter, the flat surface can alleviate the compressive deformation of the blank. Compared with the uneven transverse limiter surface, it avoids further deformation of the blank caused by local force on the contact surface with the transverse limiter.

[0072] The longitudinal limiter 121b includes a first surface and a second surface relative to each other, the first surface and / or the second surface corresponds to the limiter surface, the first surface and / or the second surface is in contact with the front light guide plate blank, and the longitudinal limiter is used to limit the longitudinal position of the front light guide plate blank, limit the longitudinal deformation of the blank during the hot pressing process, avoid shrinkage of the blank, and uneven inclination of the hot pressing surface; and separate adjacent blanks to avoid the molten raw material or the molten protective film being subjected to the pressure of the pressure roller and causing the molten material between adjacent plates to stick together.

[0073] For ease of understanding, the dimensions of the hot press jig are explained below using a formula.

[0074] The thickness of the anti-adhesive spacer satisfies the following formula:

[0075] D = d + h;

[0076] Wherein, D is the thickness of the anti-adhesive spacer, and D is greater than or equal to 0.3 mm;

[0077] d is the thickness of the longitudinal stopper, d is greater than or equal to 0.15 mm;

[0078] h is the height of the second material holding chamber.

[0079] The sum of the thickness of the longitudinal limiter and the height of the second material cavity on one side is the thickness of the anti-sticking spacer. For example, in order to produce and process 0.4mm billets, a 0.05mm protective film is provided on the upper and lower surfaces of the billets, and the total thickness of the billets is 0.5mm. If the billets can be stacked in a hot pressing jig and separated by anti-sticking spacers, the height h of the second material cavity needs to be greater than or equal to 0.5mm. In order to facilitate the mechanical processing of the jig, the size of the longitudinal limiter d is usually above 0.2mm. If d is set to 0.2mm, the thickness of D as the anti-sticking spacer is 0.7mm.

[0080] Generally, for ease of machining, the thickness D of the release spacer is greater than or equal to 0.3 mm. Preferably, the thickness D of the release spacer is greater than or equal to 0.4 mm.

[0081] The present invention does not impose any special restrictions on the thickness d of the longitudinal limiter. Preferably, d is greater than or equal to 0.15 mm. If d is too thin, its supporting force will be reduced, and the blank cannot be effectively clamped, supported, and fixed. At the same time, machining errors may occur when machining the fixing portion because d is too thin, and the mechanical precision is insufficient. Therefore, the thickness of d is preferably greater than or equal to 0.2 mm. However, if d is too thick, the number of blanks that can be stacked will be reduced, reducing production efficiency. The thickness of d can be designed according to the actual size of the jig and the hot-pressed blank. For example, in order to clamp and fix thicker blanks, it is necessary to design thicker longitudinal limiters, such as 0.5 mm blanks with 0.3 mm longitudinal limiters. At the same time, in order to stack more blanks, the overall size of the hot-pressing jig is enlarged to facilitate the design of more blank placement space and increase the number of blanks to be placed. On the other hand, the size of the longitudinal limiter is in the range of micrometers to millimeters, so there may be slight elastic deformation when supporting the blank, thereby generating some elastic clamping force on the blank. For example, under the influence of gravity, when the blank is supported by the anti-sticking spacer, the longitudinal limiter bends downward, and the height of the material cavity becomes smaller. When the next piece of blank is placed, the longitudinal limiter on the upper surface side bends, squeezing the space in the material cavity, and stacking them in sequence until the blank at the bottom is stacked. After bending, the longitudinal limiter contacts the blank and generates some clamping force on the blank, producing a fixing effect.

[0082] In order to ensure that the size and tolerance of the hot pressing jig for machining meet the requirements, the requirements here mean that the blank can be inserted into the hot pressing jig manually or by robot without extrusion or other deformation. At the same time, the lateral limiter in the step structure of the jig is in contact with the inserted blank, so that the blank will not deviate and slide in the jig during subsequent hot pressing. The longitudinal limiter supports the blank and spaces the adjacent blanks. Therefore, there is a minimum size limit requirement for the hot pressing jig for machining. The larger the size, the easier the machining is, but the number of stacked blanks will be reduced.

[0083] The present invention does not specifically limit the size of the longitudinal limiter along the accommodating cavity (hereinafter referred to as width). As an optional implementation, Figure 1 and Figure 2 As shown, the widths of multiple longitudinal limit members are consistent, ranging from 5 mm to 35 mm. If the width is too small, the blank cannot be effectively supported and fixed. At the same time, the longitudinal limit members also have a certain clamping function, as mentioned above; if the width is too wide, the bending effect of the longitudinal limit members will be more obvious, the stacking effect will be poor, and raw materials will be wasted, increasing costs.

[0084] Figure 3 The enlarged schematic diagram in the middle circle B is as follows Figure 4 As shown, the hot pressing jig further includes a scratch-proof member 5, which is arranged on the surface of the side of the anti-sticking spacer 121 away from the light guide plate limit plate 11, and the scratch-proof member 5 is used to contact the surface of the front light guide plate blank 3 to prevent the front light guide plate blank 3 from being scratched by the longitudinal limit member 121b when inserted into the hot pressing jig. Preferably, the scratch-proof member can be foam, which has elasticity. At the same time, if the thickness of the blank is greater than the height of the second material cavity, the blank will squeeze the foam during the insertion process, so that the jig firmly clamps the blank, which is conducive to hot pressing without deformation.

[0085] In some embodiments, the hot pressing fixture further includes a base plate, such as Figure 6 , Figure 7 and Figure 8As shown, the bottom plate 4 is arranged at the bottom of the hot pressing jig, and a third material holding cavity is formed between the bottom plate and the adjacent anti-adhesive spacer. The bottom plate closes the bottom opening of the hot pressing jig, and the bottom plate 4 is connected to the adjacent anti-adhesive spacer 121. Bolts 4a are also arranged on the bottom plate. Correspondingly, through holes are arranged in the anti-adhesive spacer device and the light guide plate limit plate of the jig so that the bolts can pass through. In this way, during the process of combining the bottom plate 4 with the hot pressing jig 1, the bolts on the bottom plate pass through the through holes, and the bolts 4a that pass through and protrude from the light guide plate limit plate are tightened and fixed with nuts 4b. The bottom plate can fix the jig on the hot pressing device on the one hand, and can form a third material holding cavity between the adjacent anti-adhesive spacer on the other hand. The third material holding cavity can be used to hold the front light guide plate blank, which increases the number and space of the hot pressing jig to hold blanks.

[0086] The present invention does not impose any special restrictions on the material of the hot pressing jig, as long as it can be processed into a hot pressing jig and has a certain strength. For example, the hot pressing jig is made of high-strength plastic material; for another example, the hot pressing jig is made of ceramic or glass. Preferably, the hot pressing jig is made of metal material, which has high strength and does not deform easily, and is easy to machine.

[0087] As a second aspect of the present disclosure, a hot pressing assembly is provided, including a hot pressing jig and a pressing head. The hot pressing jig is the hot pressing jig provided in the first aspect of the present disclosure, and the pressing head is arranged on a side close to the first hot pressing port and / or the second hot pressing port of the hot pressing jig. A plurality of front light guide plate blanks are accommodated in the hot pressing jig, and the pressing head performs hot pressing on the blanks from the first hot pressing port and / or the second hot pressing port of the hot pressing jig, so that multiple sheets can be hot pressed simultaneously without deformation, and the protective film can be prevented from melting and sticking, which greatly improves the efficiency of hot pressing and saves costs. The front light guide plate obtained by using the hot pressing assembly of the present invention has a good transfer effect and a higher light guiding quality.

[0088] As a third aspect of the present disclosure, a method for hot pressing a front light guide plate is disclosed, comprising the following steps:

[0089] In step S100, multiple sheets of front light guide plate blanks are stacked and placed in a hot pressing jig, and the hot pressing jig is the hot pressing jig described above. Specifically, the front light guide plate blanks are arranged in the first material holding cavity and / or the second material holding cavity, and any two adjacent front light guide plate blanks are separated by an anti-sticking spacer, so that there is a gap between adjacent front light guide plate blanks, and the dimension of the front light guide plate blanks along the depth direction of the hot pressing jig is greater than the depth of the hot pressing jig, so that the front light guide plate blanks protrude from the hot pressing jig through the first hot pressing port and / or the second hot pressing port, exposing the end face of the front light guide plate blanks for hot pressing, such as Figure 5 and Figure 8As shown, the present invention does not impose any special limitation on the protrusion size. Preferably, the protrusion size of the front light guide plate blank protruding from the hot pressing jig is between 0.5 mm and 2 mm. If the protrusion is too short, the blank may bend and deform and shrink during the hot pressing, causing the hot pressing end face to shrink in the jig and unable to expose the end face for hot pressing. However, if the protrusion is too long, the hot pressing deformation of the blank may be more serious.

[0090] In step S100, the present invention can stack multiple sheets of blanks in advance and place them in multiple hot pressing jigs, waiting for subsequent hot pressing, saving preprocessing time, and transporting the hot pressing jigs storing the blanks to the hot pressing equipment for hot pressing, which is more conducive to achieving fully automated processing, reducing labor costs, and improving production efficiency.

[0091] In step S110, the front light guide plate blank is hot pressed by a pressing head to obtain the front light guide plate. Specifically, the pressing head hot presses the front light guide plate blank through the first hot pressing port and / or the second hot pressing port. Preferably, the front light guide plate blank is hot pressed by hot rolling or hot flat pressing. Because the jig separates multiple pieces of blanks, the molten waste generated by the pressure head when hot pressing the end face of the blank will not stick to the adjacent blanks, and the spacing provides a certain storage space for the molten waste; in addition, because the hot pressing jig limits the accommodating space of a single piece of blank to the accommodating cavity, and the remaining end faces of the blank are also restricted and blocked by the hot pressing jig, when the blank is deformed by the pressure of the pressure head, it will be confined to a small space, limiting the greater deformation of the blank, so that the blank maintains a basically unchanged shape and position, which is conducive to hot pressing, so as to achieve a better transfer effect; at the same time, hot pressing multiple pieces of blanks together changes the original single-piece end face force into multiple pieces of force, increases the pressure area, and can evenly disperse the hot pressing pressure. In this case, the hot pressing pressure can be increased without causing further deformation of the blank, and a better transfer effect can be obtained.

[0092] The hot pressing method provided by the present invention can effectively improve the hot pressing efficiency and realize hot pressing of multiple blanks at the same time, which greatly saves costs. At the same time, the transfer effect is good and the light guiding quality of the front light guide plate is also higher.

[0093] The present invention does not impose any special limitation on the thickness of the front light guide plate blank, which only needs to be able to be stacked and placed in a hot pressing fixture. Preferably, the thickness of the front light guide plate blank is between 0.1 mm and 0.7 mm.

[0094] The present invention does not impose any special restrictions on the material of the front light guide plate blank. Preferably, the front light guide plate blank is made of a PC (polycarbonate) thin plate.

[0095] As a fourth aspect of the present invention, a front light guide plate is disclosed. The front light guide plate is prepared by the above-mentioned hot pressing method. Preferably, the thickness of the front light guide plate is between 0.1 mm and 0.7 mm.

[0096] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A hot pressing jig, which is used to prepare a front light guide plate, characterized in that: The hot pressing jig (1) comprises a light guide plate limiting plate (11) and an anti-sticking support device (12), wherein the light guide plate limiting plate has a limiting surface, and the anti-sticking support device (12) is arranged on the limiting surface, and the anti-sticking support device comprises a plurality of anti-sticking spacers (121), wherein the plurality of anti-sticking spacers (121) are arranged in a direction away from the light guide plate limiting plate (11), and a first material receiving cavity (111) is formed between the anti-sticking spacers adjacent to the light guide plate limiting plate (11) and the light guide plate limiting plate (11), and a second material receiving cavity (122) is formed between any two adjacent anti-sticking spacers, and both the first material receiving cavity and the second material receiving cavity are used to accommodate the front light guide plate blank, and the first material receiving cavity has a first hot pressing port, and the second material receiving cavity has a second hot pressing port, and the first hot pressing port and the second hot pressing port are located on the same side.

2. The hot pressing jig according to claim 1, characterized in that: The height of the first material containing cavity (111) and the height of the second material containing cavity (122) match the thickness of the front light guide plate blank.

3. The hot pressing jig according to claim 2, characterized in that: The height of the first material containing cavity (111) and the height of the second material containing cavity (122) are between 0.1 mm and 0.7 mm.

4. The hot pressing jig according to claim 1, characterized in that: The anti-adhesion support device (12) includes a first anti-adhesion support device (12a) and a second anti-adhesion support device (12b), the first anti-adhesion support device (12a) and the second anti-adhesion support device (12b) are arranged opposite to each other, the plurality of anti-adhesion spacers (121) include a plurality of first anti-adhesion spacers and a plurality of second anti-adhesion spacers, the first anti-adhesion spacer is arranged on the first anti-adhesion support device (12a), the second anti-adhesion spacer is arranged on the second anti-adhesion support device (12b), and the first anti-adhesion spacer corresponds to the second anti-adhesion spacer one by one.

5. The hot pressing jig according to claim 1, characterized in that: The anti-sticking spacer (121) comprises a transverse limiting piece (121a) and a longitudinal limiting piece (121b); the longitudinal limiting piece is arranged on a side of the transverse limiting piece (121a) close to the second material containing cavity (122); the thickness of the transverse limiting piece is greater than the thickness of the longitudinal limiting piece, so that the anti-sticking spacer (121) has a step structure; in the step structure, the transverse limiting piece is used to limit the transverse position of the front light guide plate blank; The longitudinal limiting member (121b) comprises a first surface and a second surface opposite to each other, the first surface and / or the second surface correspond to the limiting surface, the first surface and / or the second surface are in contact with the front light guide plate blank, and the longitudinal limiting member is used for longitudinally limiting the front light guide plate blank.

6. The hot pressing jig according to claim 5, characterized in that: The thickness of the anti-adhesive spacer (121) satisfies the following formula: D = d + h; Wherein, D is the thickness of the anti-adhesive spacer (121), and D is greater than or equal to 0.3 mm; d is the thickness of the longitudinal limiting member (121b), and d is greater than or equal to 0.15 mm; h is the height of the second material holding cavity (122).

7. The hot pressing jig according to any one of claims 1 to 6, characterized in that: The hot pressing jig further includes an anti-scratch member, which is disposed on a surface of the anti-sticking spacer on a side away from the light guide plate limiting plate, and is used to contact the surface of the front light guide plate blank.

8. The hot pressing jig according to any one of claims 1 to 6, characterized in that: The hot pressing jig further includes a bottom plate, which is disposed at the bottom of the hot pressing jig, and a third material holding cavity is formed between the bottom plate and the adjacent anti-sticking spacer.

9. A hot pressing assembly, comprising a hot pressing jig and a pressing head, characterized in that: The hot pressing jig is the hot pressing jig according to any one of claims 1 to 8, and the pressing head is arranged on one side of the first hot pressing port and / or the second hot pressing port of the hot pressing jig.

10. A hot pressing method for a front light guide plate, characterized in that: include: Stacking multiple pieces of front light guide plate blanks and placing them in a hot pressing jig, the hot pressing jig being the hot pressing jig according to any one of claims 1 to 8, wherein the front light guide plate blanks are arranged in the first material holding cavity and / or the second material holding cavity, and any two adjacent front light guide plate blanks are separated by the anti-sticking spacer, so that there is a gap between adjacent front light guide plate blanks, and the dimension of the front light guide plate blanks along the depth direction of the hot pressing jig is greater than the depth of the hot pressing jig, so that the front light guide plate blanks protrude from the hot pressing jig through the first hot pressing port and / or the second hot pressing port, exposing the end face of the front light guide plate blanks for hot pressing; The front light guide plate blank is hot-pressed by using a pressing head to obtain the front light guide plate, wherein the pressing head hot-presses the front light guide plate blank through the first hot-pressing port and / or the second hot-pressing port.

11. The hot pressing method according to claim 10, characterized in that: The protrusion dimension of the front light guide plate blank protruding from the hot pressing jig is between 0.5 mm and 2 mm.

12. The hot pressing method according to any one of claims 10 or 11, characterized in that: The hot pressing of the front light guide plate blank by using a pressing head includes hot rolling and / or hot flat pressing.

13. A front light guide plate, characterized in that: The front light guide plate is prepared by the hot pressing method according to any one of claims 10 to 12, and the thickness of the front light guide plate is between 0.1 mm and 0.7 mm.

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