Lens injection molding runner and injection mold of AR lens

Abstract

The utility model discloses a lens injection molding runner and an injection mold of an AR (Augmented Reality) lens, the lens injection molding runner comprises a main runner, a plurality of sub-runners and sprues thereof, the main runner is communicated with each sub-runner, each sub-runner is communicated with one sprue, and each sprue is communicated with one mold cavity of the AR lens; a groove which is sunken towards the interior of the runner is formed in the position, close to the pouring gate, of each sub-runner, and the groove is arched in the runner direction of the sub-runner. According to the utility model, the occurrence probability of a spraying phenomenon can be reduced, spraying marks on the AR lens formed by injection molding are avoided, and the appearance yield of the AR lens is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to AR lens technical field especially relates to a lens injection runner, injection mold of AR lens. BACKGROUND

[0002] AR and other surreal experiences have been widely used in aerospace, aviation, military, education, navigation, retail, warehousing, tourism, social interaction, games and other aspects. For example, HUD (Head Up Display) is the most widely used AR technology in vehicles, so that drivers can see the windshield glass speed, navigation and other driving information without lowering their heads, thereby improving the driver's attention. AR technology has penetrated into all aspects of people's production and life, and more and more people feel the convenience and colorful life brought by technological development.

[0003] AR lens is usually designed to be large, with a maximum length of about 42mm and a maximum width of about 20mm. The maximum length and width are generally designed to fit the human eye, so that a large enough field of view can be ensured, and the thickness is distributed between 1.3 and 1.8mm.

[0004] Due to the large size of AR lens, a fan-shaped gate is usually used. During injection molding, the melt is ejected from the nozzle of the injection molding machine, enters the main runner, then enters the branch runner, and finally enters the product through the gate to complete the injection filling process. Considering the large and thin design of AR lens, in order to fill smoothly, the thickness of the gate is generally designed to be close to the thickness of the product. When the injection speed is too fast, the plastic flow is unstable, which leads to easy spraying during filling. The sprayed melt is in a snake shape, which has a great impact on the appearance of AR lens and seriously reduces the yield. In order to eliminate the spray marks, slow injection speed is generally used to pass through the gate, and then the injection speed is appropriately increased after the melt flows through the gate. In addition, when the material temperature or mold temperature is too low, the melt viscosity is high, the shear stress is large, and the melt is easy to break, which is prone to spraying. By increasing the material temperature or mold temperature, the spraying effect can be inhibited, but these need to be controlled based on the molding conditions, which has certain control difficulty and requires large economic cost. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a lens injection runner and injection mold for AR lens, which can reduce the probability of spraying and avoid the occurrence of spraying marks on the AR lens formed by injection molding, thereby ensuring the appearance yield of the AR lens.

[0006] In order to solve the above technical problems, the utility model discloses a first aspect discloses a kind of lens injection flow channel of AR lens, including main flow channel, multiple branch flow channel and its gate, the main flow channel is communicated with each branch flow channel, each branch flow channel is communicated one gate, each gate is communicated one mold cavity of the AR lens;Each branch flow channel is provided with recess in the position close to the gate towards flow channel interior, and the recess is in the flow channel direction of this branch flow channel It is arc-shaped.

[0007] As an optional implementation, the diameter of the branch flow channel is 4-5mm.

[0008] As another optional implementation, the radius of the recess is 2-2.5mm.

[0009] As another optional implementation, the distance between the recess and the end of the branch flow channel in the direction of flow channel is 0.3-0.6mm.

[0010] As another optional implementation, the gate is a fan-shaped gate.

[0011] As another optional implementation, the direction of the main flow channel is vertical direction.

[0012] As another optional implementation, the direction of the branch flow channel is horizontal direction.

[0013] As another optional implementation, the recess is located at the bottom of the branch flow channel.

[0014] The utility model discloses a second aspect discloses a kind of injection mold of AR lens, including the lens injection flow channel as described in the utility model first aspect.

[0015] Compared with prior art, the utility model embodiment has the following beneficial effects:

[0016] The recess is provided on the branch flow channel close to the gate, and the main role of the recess is to slow down the speed of the molten glue flowing through the gate, to avoid the molten glue from being sprayed when entering the mold cavity of the AR lens;Wherein, the recess is arc-shaped, when the molten glue flows to the recess, it is equivalent to the molten glue " climbing " upward, the flow resistance increases, so the flow rate decreases, which can ensure that the molten glue flows into the gate uniformly and relatively slowly from the end of the flow channel, rather than directly rushing into the gate from the flow channel at a high speed, which can reduce the probability of occurrence of the spraying phenomenon, avoid the spraying marks on the AR lens formed by injection molding, and ensure the appearance yield of the AR lens. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] Figure 1 is a structural schematic view of a lens injection runner of an AR lens disclosed by the embodiments of the present application;

[0019] Figure 2 is a partial enlarged schematic view of part A in Figure 1

[0020] Figure 3 is another structural schematic view of a lens injection runner of an AR lens disclosed by the embodiments of the present application. DETAILED DESCRIPTION

[0021] In order to make the personnel in the technical field better understand the present application scheme, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0022] Embodiment one

[0023] Referring to Figures 1-3 , the embodiments of the present application disclose a lens injection runner of an AR lens, which comprises a main runner 1, a plurality of sub-runners 2 and a gate 3 corresponding to the sub-runners 2. Figures 1-3 The main runner 1 is communicated with each of the sub-runners 2, each of the sub-runners 2 is communicated with one of the gates 3, and each of the gates 3 is communicated with one of the mold cavities 4 of the AR lens. The molten glue in the main runner 1 flows into each of the sub-runners 2 and then flows into the mold cavity 4 of the AR lens corresponding to the gate 3 through the corresponding gate 3 of the sub-runner 2. Each of the sub-runners 2 is provided with a groove 21 recessed towards the inside of the runner at a position close to the gate 3, and the groove 21 is arched in the direction of the runner of the sub-runner 2. The groove 21 is used to increase the flow resistance and reduce the flow speed of the molten glue in the runner.

[0024] ​The utility model discloses an embodiment is provided with recess 21 on the position of runner 3 close to the position of runner 3 on the runner 2, the main role of this recess 21 is to make the speed of melt glue flow through runner 3 slow, avoid the phenomenon of injection when melt glue enters the mold cavity 4 of AR lens, wherein, recess 21 is arc, when melt glue flows to recess 21, equivalent to melt glue in upward " climbing the hill ", flow resistance increases, therefore flow rate reduces, this can guarantee that melt glue evenly and relatively slowly from the end of flow channel flows into runner 3, instead of directly from flow channel into runner 3 with higher speed, can reduce the probability of the occurrence of injection phenomenon, avoid the injection of AR lens and appear injection mark, guarantee the appearance yield of AR lens.

[0025] In an alternative embodiment, the diameter of the runner 2 is 4-5mm.

[0026] In another alternative embodiment, the radius of the recess 21 is 2-2.5mm.

[0027] In another alternative embodiment, the distance between the recess 21 and the end of the runner 2 in the direction of flow channel is 0.3-0.6mm.

[0028] In another alternative embodiment, the runner 3 is a fan-shaped runner 3.

[0029] In another alternative embodiment, the direction of the main runner 1 is vertical direction.

[0030] In another alternative embodiment, the direction of the runner 2 is horizontal direction.

[0031] In another alternative embodiment, the recess 21 is located at the bottom of the runner 2.

[0032] The main role of the groove 21 is to slow down the speed of the molten glue flowing through the gate 3, so as to avoid the spraying phenomenon of the molten glue when entering the AR lens. The R value (groove radius) of the groove 21 and the distance L of the groove 21 from the end of the flow distribution channel 2 are two important factors affecting the speed reduction effect of the molten glue. If the R value of the groove 21 is too large, the arch amplitude of the groove 21 is smaller, and therefore the speed reduction effect of the molten glue is poorer. If the distance L of the groove 21 from the end of the flow distribution channel 2 is farther, the molten glue cannot be slowed down near the gate 3, and cannot prevent the spraying effect. Therefore, appropriate R value and distance L can obtain the best speed reduction effect. Through repeated practice, different combination schemes of R value and distance L are formulated, and then the mold is made and tested, and finally it is determined that when the diameter of the flow distribution channel 2 is generally distributed in 4-5mm, the R value is between 2-2.5, and the distance L is between 0.3-0.6mm, the speed reduction effect is better, and the spraying phenomenon does not occur on the AR lens, so that the appearance problem of the spraying trace is not caused. In addition, through practical experience, it is found that the diameter of the flow distribution channel 2 of the AR lens is generally distributed in 4-5mm, which is the most suitable. If the diameter of the flow distribution channel 2 is too large, not only the water gate material is wasted, but also the speed reduction effect of the groove 21 is not good. If the diameter of the flow distribution channel 2 is too small, the injection pressure is too high, the injection speed is accelerated, and the spraying phenomenon is also caused.

[0033] Embodiment two

[0034] The utility model discloses an injection mold of AR lens, including the lens injection runner as the embodiment one has described, still can include the mold cavity of AR lens as the embodiment one has described.

[0035] The utility model discloses an injection mold of AR lens, including the lens injection runner as the embodiment one has described, still can include the mold cavity of AR lens as the embodiment one has described.

[0035] The utility model discloses an injection mold of AR lens, including the lens injection runner as the embodiment one has described, still can include the mold cavity of AR lens as the embodiment one has described.

Claims

1. A lens injection molding runner for an AR lens, comprising a main runner, a plurality of branch runners, and gates thereof, wherein the main runner is connected to each of the branch runners, each of the branch runners is connected to a gate, and each of the gates is connected to a mold cavity of the AR lens; characterized in that: Each of the branch runners is provided with a groove recessed toward the inside of the runner at a position close to the gate, and the groove is arched in the runner direction of the branch runner; The branch flow channel includes a descending flow channel, and the groove is located at the tail end of the descending flow channel; The diameter of the diversion channel is 4-5 mm; The radius of the groove is 2-2.5 mm; The distance between the groove and the end of the branch channel in the direction of the channel is 0.3-0.6 mm.

2. The lens injection molding channel according to claim 1, characterized in that: The gate is a fan-shaped gate.

3. The lens injection molding channel according to claim 1, characterized in that: The direction of the main flow channel is vertical.

4. The lens injection molding channel according to claim 1, characterized in that: The direction of the branch channel is horizontal.

5. The lens injection molding channel according to claim 1, characterized in that: The groove is located at the bottom of the branch channel.

6. An injection mold for AR lenses, characterized in that: The lens injection molding channel comprises the lens injection molding channel as described in any one of claims 1 to 5.

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