CN106514957A - Optical lens and injection molding die thereof - Google Patents

Abstract

The invention provides an optical lens and an injection molding die thereof. The optical lens injection molding die comprises a disc-shaped die holder and a nozzle. The disc-shaped die holder defines a die cavity chamber and a pouring gate communicated with the die cavity chamber, the die cavity chamber comprises an optical effective area central flow channel and a non-optical effective area circumferential flow channel, and the optical effective area central flow channel is defined between an upper curved surface and a lower curved surface in the disc-shaped die holder; the non-optical effective area circumferential runner surrounds and is communicated with the optical effective area central runner and is communicated with the pouring gate. The disc-shaped die holder is provided with a plurality of turbulence structures in the non-optical effective area and in the circumferential flow channel. The nozzle is connected with the disc-shaped die holder and injects a melt into the die cavity through the pouring gate. The flow-disturbing structures disturb the flow velocity of the melt in the peripheral flow channel of the non-optical effective area, so that the melt preferentially fills the central flow channel of the optical effective area, and defects are not generated in an optical effective area of the optical lens, thereby improving the yield of the optical lens.

Description

Optical lens and its injection mold

technical field

The present invention relates to an injection molding mold and an optical lens for corresponding injection, in particular to an injection molding mold with high production yield and an excellent optical lens for corresponding injection.

Background technique

With the advancement of science and technology, it has gradually developed towards the process of miniaturization of objects. In addition to the smaller and smaller diameter requirements of optical lenses, there is also a requirement for thinner and thinner thickness, that is, optical lenses are moving toward miniaturization. develop. At the same time, due to the diversification of functions of electronic devices, the industry has begun to have situations and demands for mounting optical lenses on mobile electronic devices. For example, optical lenses and laser light sources are combined to form an application function of illuminating structured light.

Fig. 1 is a perspective view of a traditional injection molding mold, as shown in the figure, a traditional injection molding mold 1 has an upper curved surface structure 10 upwardly arched in an arc; Fig. 2 is a view of another angle of a traditional lens injection molding mold In a three-dimensional schematic view, a traditional injection molding mold 1 has a lower curved surface structure 11 that also arches upward in an arc shape. In the manufacturing process of optical lenses, the melt flows from the gate 12 into the cavity of the traditional injection molding mold, and the cavity is defined by the upper curved surface structure and the lower curved surface structure. After the melt cools down, a new product can be taken out. A curved optical lens.

Fig. 3 is a cross-sectional view with the A-A line segment as the cross-sectional angle in Fig. 1 . In Fig. 3, since the lower curved surface structure 11 is arched towards the chamber 15, most of the melt will be guided to flow rapidly toward the two ring sides of the lower curved surface structure 11, as shown by the fluid pointing arrow 17; as for the other part of the melt The fluid then slowly crosses and flows through the lower curved structure 11 from above the lower curved structure 11 , as indicated by the fluid pointing arrow 18 .

However, the channel height of the two ring sides of the cavity 15 of the conventional injection molding mold 1 is higher than the channel height of the central region of the cavity 15 of the conventional injection molding mold 1, and therefore the melt will be less resistant Therefore, the flow velocity on the two ring sides will be faster than that in the central area, which will lead to the flow of the melt in the chamber during the lens manufacturing process as shown in Figure 4. However, its disadvantage is that before the melt 8 has completely filled the central area (that is, the optical effective area of the lens), the melt 8 has already filled the two ring sides (that is, the non-optical effective area of the lens), and when the final lens is formed , there will be voids or fusion lines 19 formed in the central area of the lens (that is, the optically effective area of the lens), which seriously affects the optical performance of the lens.

In view of this, in order to produce usable optical lenses, it is an urgent problem to be solved in the technical field to provide an injection molding mold capable of producing lenses with good optical properties.

Contents of the invention

The technical problem to be solved by the present invention is to provide a well-formed optical lens and its injection molding mold in view of the above-mentioned deficiencies in the prior art. The flow velocity and direction at the non-optically effective area are slowed down, thereby avoiding the formation of multiple or birefringent index blocks with voids, fusion lines, or stress residual effects at the optically effective area of the optical lens.

The technical solution adopted by the present invention to solve the technical problem is to provide an optical lens injection molding mold for injecting a melt to form an optical lens. The optical lens injection molding mold includes a disc mold base and a nozzle. The disc-shaped mold base defines a mold cavity chamber and a gate connected with the mold cavity chamber. The mold cavity chamber includes a central flow channel in an optically effective area and a peripheral flow channel in a non-optically effective area. The central flow channel in the optically effective area A channel is defined between an upper curved surface and a lower curved surface inside the disc-shaped mold base, so that the shape of the optical lens corresponds to the upper curved surface and the lower curved surface; the non-optical effective area is surrounded by a circumferential flow channel and communicated with the center of the optical effective area The runner communicates with the gate, wherein the disc-shaped mold base forms a plurality of spoiler structures around the runner in the non-optically effective area. The nozzle is connected to the disc-shaped mold base, and a melt is injected into the mold cavity through the gate; wherein, the plurality of spoiler structures hinder the flow of the melt in the non-optically effective zone circumferential channel, As a result, the melt preferentially fills the central flow channel of the optically effective region.

Preferably, the disc-shaped mold base is a disc-shaped mold base, and the plurality of flow-disturbing structures are a plurality of flow-disturbing protrusions and/or flow-disturbing recesses.

Preferably, the disc-shaped mold base includes an upper mold base and a lower mold base, and the upper mold base and the lower mold base are assembled to jointly form the mold cavity.

Preferably, the plurality of flow disturbing structures are arranged in a ring shape in the peripheral flow channel of the non-optically effective area, and surround the central flow channel of the optically effective area.

Preferably, at least one of the plurality of flow turbulence structures is disposed adjacent to the gate of the non-optically effective region circumferential flow channel.

Preferably, two of the plurality of flow turbulence structures are disposed adjacent to the gate of the non-optical effective region circumferential flow channel, and are symmetrically disposed on the reference line with an injection direction of the gate as a reference line. both sides of the line.

Preferably, the center of curvature of the upper curved surface and the center of curvature of the lower curved surface are located on the same side of the disc-shaped mold base.

Preferably, the upper curved surface and the lower curved surface are upwardly arched, and the plurality of spoiler structures protrude upward toward the upper curved surface.

Preferably, there are multiple nozzles, and the multiple nozzles are connected to the disc-shaped mold base.

The present invention also provides an optical lens, which is obtained by injection molding of an optical lens injection mold. The optical lens includes a lens body, an optical effective area, a non-optical effective area, and a plurality of corresponding structures for disturbing flow. The optical effective area Located in the central portion of the mirror body for multiple beams to traverse. The non-optically effective area is located at the peripheral portion of the mirror body, surrounding and surrounding the optically effective area. The plurality of flow disturbance corresponding structures are formed in the non-optically active area and surround the optically active area.

Preferably, the mirror body includes a gate face, wherein at least one of the plurality of flow disrupting corresponding structures is adjacent to the gate face.

Preferably, the mirror body includes a gate surface, wherein two of the plurality of spoiler corresponding structures are adjacent to the gate surface, and are arranged symmetrically with a normal direction of the gate surface as a reference line on both sides of the baseline.

Preferably, the mirror body includes an upper curved surface and a lower curved surface, wherein the upper curved surface and the lower curved surface are curved and arched with the same orientation.

Preferably, an inner surface of the plurality of flow-disturbing corresponding structures is curved and arched in the same direction as the upper curved surface and the lower curved surface.

Preferably, the non-optically effective area is formed with a sprayed layer having a wave-absorbing effect to reduce reflection or diffusion of light.

Preferably, the plurality of flow-disturbing corresponding structures are a plurality of corresponding flow-disturbing concave structures and/or corresponding current-disturbing protrusion structures.

The optical lens injection molding mold of the present invention is provided with multiple turbulence structures, thereby reducing the flow rate of the melt in the peripheral channel of the non-optically effective area, so that the melt preferentially fills the central channel of the optically effective area, thereby avoiding voids Defects such as fusion lines or improper stress residues are formed in the optical effective area of the optical lens, thereby improving the yield of the optical lens, and leaving holes or fusion lines formed in the non-optical effective area of the optical lens will not affect the optical characteristics. And because the corresponding structural arrangement of the corresponding periodic turbulence strengthens the stress intensity of the lens, so that when the lens of the present invention is assembled into a lens group, it has a strong force and tolerance tolerance.

Description of drawings

FIG. 1 is a perspective view of a conventional injection molding mold.

FIG. 2 is a three-dimensional schematic diagram of another angle of a conventional injection molding mold.

FIG. 3 is a cross-sectional view of the conventional injection mold in FIG. 1 taken along the line segment A-A.

Figure 4 shows the flow of the melt in the cavity of a conventional injection molding mold during lens manufacturing.

FIG. 5 is a three-dimensional schematic view of the injection molding mold for the optical lens of the present invention.

FIG. 6 is a schematic perspective view of another angle of the injection molding mold for the optical lens of the present invention.

Fig. 7 is a sectional view of the injection molding mold for the optical lens taken along the line B-B in Fig. 5 .

Fig. 8 is a schematic top view of the optical lens of the present invention.

Fig. 9 is a corresponding top view and cross-sectional schematic diagram of the optical lens of the present invention.

FIG. 10 shows the flow of the melt in the mold cavity during the production of the optical lens by the injection molding mold for the optical lens of the present invention.

detailed description

5 is a schematic perspective view of the injection mold for optical lenses of the present invention; FIG. 6 is a schematic perspective view of another angle of the injection molding mold for optical lenses of the present invention; FIG. As shown in FIGS. 5 to 7 , the optical lens injection molding mold 2 of the present invention includes a disc-shaped mold base 21 and a nozzle 22 , the nozzle 22 is connected to the disc-shaped mold base 21 , and its internal space is also connected. The upper surface of the disc-shaped mold base 21 arches upwards in an arc shape, and a curved surface vertex P is formed at the central point to manufacture an optical lens with a similar curved surface.

The disc-shaped mold base 21 defines a mold cavity chamber 210 (please refer to FIG. 7 ) and a gate 211 communicating with the mold cavity chamber 210 (please refer to FIGS. 5 and 6 ). In detail, during the manufacturing process, the melt flows out from the nozzle 22 and is injected into the mold cavity 210 through a gate 211 . What needs to be explained here is that during the manufacturing process of optical lens injection molding, the melt 9 will gradually fill the mold cavity 210 (please refer to the hatched area in FIG. 10 representing the pouring of the melt 9), waiting for After the melt 9 is solidified, it can be taken out by splitting or cutting to obtain an optical lens, which is then used for lens assembly. As for the material of the melt 9 referred to here, it can be a molten plastic, a molten glass or other thermoplastic transparent materials.

Please refer to Fig. 7, the disc-shaped mold base 21 of the optical lens injection molding mold 2 of the present invention has an upper inner surface 212 and a lower inner surface 213, and a boundary between the upper inner surface 212 and the lower inner surface 213 is used to place the optical lens The mold cavity cavity 210 formed by the outer contour. The mold cavity chamber 210 is a channel space for the melt 9 to flow through, which includes a central flow channel 210a in the optically effective area and a peripheral flow channel 210b in the non-optically effective area. The central flow channel 210a in the optically effective area is defined on the upper inner surface 212 between the upper curved surface 212a of the lower inner surface 213 and the lower curved surface 213a of the lower inner surface 213 .

Wherein, both the upper curved surface 212 a and the lower curved surface 213 a may be arcuate upwards. In other words, the center of curvature of the upper curved surface 212 and the center of curvature of the lower curved surface 213 are located on the same side of the disc-shaped mold base 21 . And because the optical lens profile after the melt 9 injects and solidifies can correspond to the upper inner surface 212 and the lower inner surface 213 of the disc mold base 21, so the solidified melt 9 can be formed according to the upper inner surface and the lower inner surface 213 of the actual disc mold base. The contours of the lower inner surface are different, and are designed to form contours such as convex-concave lens, concave-convex lens, convex-convex lens, and concave-concave lens.

FIG. 8 is a schematic top view of an optical lens manufactured by using the optical lens injection mold 2 of the present invention; FIG. 9 is a schematic top view and a corresponding cross-sectional view of the optical lens of the present invention, and please refer to FIG. 8 and FIG. 9 together. As mentioned above, for the optical lens 4 manufactured by the optical lens injection molding mold 2 of the present invention, the optical lens 4 includes a mirror body 40, an upper curved surface 41 and a lower curved surface 42 formed on the mirror body 40, wherein The upper curved surface 41 and the lower curved surface 42 are formed corresponding to the upper inner surface 212 and the lower inner surface 213 of the optical lens injection molding mold 2, so in this embodiment, the upper curved surface 41 and the lower curved surface 42 of the optical lens 4 also have the same orientation Curved and arched.

Furthermore, the optical lens 4 further includes an optically effective area 40a and a non-optically effective area 40b defined on the lens body 40 . In a preferred embodiment, the optical effective area 40a is located at the central part of the mirror body 40, so that when matched with a light source, multiple light beams from the light source can pass through the optical effective area 40a. As for the non-optically effective area 40b, it is located at the peripheral portion of the mirror body 40 and surrounds the optically effective area 40a.

What needs special attention here is that after the melt 9 is solidified but the newly made optical lens 4 has not been taken out from the optical lens injection molding mold 2, the optical effective area 40a of the optical lens 4 is located in the optical area of the mold cavity 210. The central flow channel 210a of the effective area, and the non-optical effective area 40b of the optical lens 4 is located in the non-optical effective area peripheral flow channel 210b of the cavity chamber 210, which is the phase between the optical lens 4 and the optical lens injection molding mold 2 when the optical lens 4 is molded. correspond to regional relations.

Next, the non-optical effective region circumferential flow channel 210b will be introduced. From Fig. 6 and Fig. 7, it is obvious that the non-optical effective area circumferential flow channel 210b surrounds and communicates with the optically effective area central flow channel 210a, and the spoiler structure 214 protrudes upward from the lower inner surface 213 toward the upper inner surface 212, and protrudes The peripheral channel 210b is formed in the non-optically effective area. The purpose of the plurality of turbulence structures 214 in the injection molding mold 2 of the present invention is to perform turbulence deceleration on the melt 9 flowing through the non-optical effective zone circumferential channel 210b when the melt 9 is injected into the mold cavity 210 In contrast, the melt 9 in the central flow channel 210a of the optically effective area without a spoiler structure will continue to fill the mold cavity 210 without interference and without deceleration. It should be noted here that the spoiler structure 214 can be purely a plurality of spoiler protrusions, or a combination of a plurality of spoiler protrusions and spoiler recesses, or simply a plurality of spoiler recesses. For the convenience of description, the present embodiment uses the example in which the spoiler structure 214 is a plurality of spoiler bumps, but it is not limited thereto.

In a preferred embodiment, as shown in FIG. 10, the flow velocity of the melt 9 in the central flow channel 210a of the optically effective region is close to the flow velocity of the melt 9 in the peripheral flow channel 210b in the non-optically effective region, so that the The melt 9 fills the central flow channel 210a of the optically effective area before filling the peripheral flow channel 210b of the non-optically effective area.

With the above configuration, the central flow channel 210a in the optically effective area is filled prior to the peripheral flow channel 210b in the non-optically effective area, and the central flow channel 210a in the optically effective area will not have empty holes or melt lines 29 formed. That is, when the melt 9 is solidified to form an optical lens, corresponding to the turbulence structure 214 of the optical lens injection mold 2, the optical lens 4 will have a plurality of turbulence corresponding structures 44 formed in the non-optically effective area 40b, and the turbulence The flow corresponding structures 44 are arranged at intervals and arranged in a ring around the optical effective area 40a. And, voids or fusion lines 29 are also formed in the non-optical effective area 40b of the optical lens 4, and these defects such as voids or fusion lines 29 existing in the non-optical effective area 40b of the optical lens 4 will not affect at all. The optical properties of optical lenses. Generally speaking, the non-optically active area 40b is designed to prevent the light beams from passing through as much as possible, so as to reduce reflection or diffusion during the imaging process. Due to the above configuration, voids, fusion lines, or improper bi- or multi-refractive-index blocks will not be formed in the optically effective area of the optical lens 4 , which greatly improves the optical performance of the optical lens 4 .

In addition, the arrangement of the turbulence corresponding structure 44 formed on the non-optical effective area 40b of the optical lens 4 can have a waveguide effect, so that when the optical lens 4 forms a lens group with a plurality of lenses, the diffusion The light thereon is gradually introduced into the interior of the flow-disturbing corresponding structure 44 of the optical lens 4 without leaking out. Furthermore, the corresponding structure 44 of the turbulence of the optical lens 4 is formed corresponding to the contour of the turbulence structure 214 of the injection molding mold 2 of the optical lens, so the corresponding structure 44 of the turbulence can be correspondingly matched to become a corresponding concave structure of the turbulence and/or a turbulence. The flow corresponds to the protruding structure. Referring again to the aforementioned embodiment of the optical lens injection mold 2 , the spoiler structure 214 is a preferred example of a plurality of spoiler protrusions, and the spoiler corresponding structure 44 of the optical lens 4 is a spoiler corresponding concave structure.

Preferably, a sprayed layer 45 can also be sprayed on the non-optically effective area 40 b of the optical lens 4 , and the sprayed layer 45 has a wave absorbing effect to reduce reflection or diffusion of light.

What needs to be additionally explained here is that after the melt 9 is solidified, the disc mold base 21 needs to be opened to push out the solidified optical lens 4, so the preferred setting is, as shown in Figures 5 and 6, the disc The mold base 21 includes an upper mold base 21 a and a lower mold base 21 b , the upper mold base 21 a and the lower mold base 21 b are combined to form a mold cavity 210 . After the optical lens is solidified and formed, the upper mold base 21 a and the lower mold base 21 b can be controlled and separated to obtain the finished optical lens 4 . Furthermore, in order to cope with the circular shape of general optical lenses, the disc-shaped mold base 21 is designed as a disc-shaped mold base 21 .

In order to achieve the best effect in the setting of the spoiler structure 214, the spoiler structure 214 is arranged in a ring in the non-optical effective area peripheral flow channel 210b, and surrounds the optical effective area central flow channel 210a, so that the non-optical effective area circumferential flow channel The melt 9 at 210b is turbulent and decelerated. In a preferred embodiment, at least one of the spoiler structures 214 is disposed at a place adjacent to the gate 211 of the non-optically effective region circumferential channel 210b. From the perspective of the optical lens 4 , that is, at least one of the flow-disturbing corresponding structures 44 is adjacent to a gate surface 43 of the optical lens 4 .

In another preferred embodiment, two of the spoiler structures 214 are arranged at the gate 211 adjacent to the peripheral flow channel 210b in the non-optically effective region, and are symmetrical with an injection direction of the gate 211 as a reference line. They are arranged on both sides of the reference line to prevent the flow of the melt when it flows into the non-optically effective area circumferential channel 210b on both sides, so as to achieve the function of deceleration. In this way, it is possible to manufacture and form the optical lens 4 in which two of the disturbing flow corresponding structures 44 are adjacent to the gate surface 43. If a normal direction of the gate surface 43 of the optical lens 4 is used as a reference line L, the disturbance flow corresponding Two of the structures 44 are symmetrically formed on both sides of the reference line L accordingly.

To sum up, the optical lens injection molding mold of the present invention is provided with a plurality of turbulent structures, thereby reducing the flow rate of the melt in the peripheral channel of the non-optically effective area, so that the melt preferentially fills the central channel of the optically effective area, In order to avoid defects such as voids, fusion lines, or improper stress remaining in the optical effective area of the optical lens, the yield of the optical lens is improved. The voids or fusion lines formed in the non-optically effective area of the optical lens will not affect the optical characteristics. And because the corresponding structural arrangement of the corresponding periodic turbulence strengthens the stress intensity of the lens, so that when the lens is assembled into a lens group, it has a strong force and tolerance tolerance.

The above-mentioned embodiments are only for illustrating the principles and effects of the present invention, as well as explaining the technical features of the present invention, and are not intended to limit the protection scope of the present invention. Any changes or equivalence arrangements that can be easily accomplished by any person of ordinary skill in the art without violating the technical principle and spirit of the present invention fall within the scope of the present invention. Therefore, the protection scope of the present invention should be as listed in the claims.

Claims (16)

1. An optical lens injection molding mold for injecting a melt to form an optical lens, characterized in that the optical lens injection molding mold comprises: A disc-shaped mold base defines a mold cavity chamber and a gate communicating with the mold cavity chamber, and the mold cavity chamber includes: The central channel of the optical effective area is defined between an upper curved surface and a lower curved surface inside the disc-shaped mold base, so that the shape of the optical lens corresponds to the upper curved surface and the lower curved surface; and The non-optically effective area circumferential flow channel surrounds and communicates with the optically effective area central flow channel and communicates with the gate, wherein the disc-shaped mold base forms a plurality of flow turbulence structures on the non-optically effective area circumferential flow channel; and a nozzle, connected to the disc-shaped mold base, injects a melt into the mold cavity through the gate; Wherein, the plurality of turbulence structures obstruct the flow of the melt in the peripheral channel of the non-optically effective area, so that the melt preferentially fills the central channel of the optically effective area. 2. The optical lens injection molding mold according to claim 1, wherein the disc-shaped mold base is a disc-shaped mold base, and the plurality of spoiler structures are a plurality of spoiler bumps and/or spoiler pit. 3. The optical lens injection molding mold according to claim 1, wherein the disc-shaped mold base includes an upper mold base and a lower mold base, and the upper mold base and the lower mold base are combined to form the mold cavity Chamber. 4 . The injection molding mold for optical lenses according to claim 1 , wherein the plurality of turbulent structures are arranged in a ring shape in the peripheral channel of the non-optically effective area, and surround the central channel of the optically effective area. 5 . The injection molding mold for optical lenses as claimed in claim 1 , wherein at least one of the plurality of flow turbulence structures is disposed adjacent to the gate of the non-optically effective region circumferential flow channel. 6 . 6. The optical lens injection molding mold as claimed in claim 1, wherein two of the plurality of turbulence structures are arranged adjacent to the gate of the non-optically effective region circumferential flow channel, and are formed by the gate An injection direction of the port is a reference line, which is symmetrically arranged on both sides of the reference line. 7. The optical lens injection mold as claimed in claim 1, wherein the center of curvature of the upper curved surface and the center of curvature of the lower curved surface are located on the same side of the disc-shaped mold base. 8 . The injection molding mold for optical lenses as claimed in claim 1 , wherein the upper curved surface and the lower curved surface are upwardly arched, and the plurality of spoiler structures protrude upward toward the upper curved surface. 9 . The injection mold for optical lens as claimed in claim 1 , wherein there are a plurality of nozzles, and the plurality of nozzles are connected to the disc-shaped mold base. 10 . 10. An optical lens obtained by injection molding of an optical lens injection mold, characterized in that the optical lens comprises: Mirror body; The optical effective area is located in the central part of the mirror body, through which multiple light beams pass; a non-optical active zone located at the peripheral portion of the mirror body surrounding the optically active zone; and A plurality of flow disturbance corresponding structures are formed in the non-optically effective area and surround the optically effective area. 11. The optical lens according to claim 10, wherein the lens body comprises a gate surface, wherein at least one of the plurality of flow-disturbing corresponding structures is adjacent to the gate surface. 12. The optical lens according to claim 10, wherein the lens body comprises a gate surface, wherein two of the plurality of flow-disturbing corresponding structures are adjacent to the gate surface, and A normal direction is a reference line, which is symmetrically arranged on both sides of the reference line. 13. The optical lens according to claim 11 or 12, wherein the mirror body comprises an upper curved surface and a lower curved surface, wherein the upper curved surface and the lower curved surface are curved and arched in the same direction. 14 . The optical lens according to claim 13 , wherein an inner surface of the plurality of turbulence corresponding structures is curved and arched in the same direction as the upper curved surface and the lower curved surface. 15. The optical lens according to claim 10, characterized in that a sprayed layer having a wave-suppressing effect to reduce reflection or diffusion of light is formed on the non-optically effective area. 16 . The optical lens according to claim 10 , wherein the plurality of corresponding structures for disturbing the flow are a plurality of recessed structures and/or corresponding protrusions for disturbing the flow. 17 .