TWM522839U - Optical lens and injection-molding mold thereof - Google Patents

Abstract

The present invention discloses an optical lens and its associated injection-molding mold. The optical lens injection-molding mold includes a plate-type die seat and a nozzle. The plate-type die seat defines a mold cavity chamber, and the mold cavity chamber includes an optical effective region central passage and a non-optical effective region annulus passage. The plate-type die seat has a plurality of turbulent structures formed in the non-optical effective region annulus passage. When melt is entering the mold cavity chamber from the nozzle, the turbulent structures disturbs the flow of melt and lowers the flow rate of melt in the non-optical effective region annulus passage. Thereby, the melt is fully filled the optical effective region central passage prior to the non-optical effective region annulus passage so that there will be not any defect formed at an optical effective region of the optical lens and therefore the defect-free rate of optical lens is enhanced.

Description

Optical lens and its injection molding die

The present invention relates to an injection molding die and a correspondingly injected optical lens, and more particularly to an optical lens excellent in the production of a high-yield injection molding die and a corresponding injection molding.

With the advancement of technology, it has gradually developed towards the process of micro-shaped parts. In addition to the smaller and smaller requirements on the diameter of optical lenses, there is also a demand for thinner thickness in the thickness, that is, the optical lenses are miniaturized in size. development of. At the same time, due to the diversification of functions of electronic devices, there have been cases and demands for mounting optical lenses on mobile electronic devices in the industry. For example, an optical lens is combined with a laser light source to form an application function that illuminates structured light.

1 is a front perspective view of a conventional injection molding die. As shown, the conventional injection molding die 1 has an upper curved structure 10 which is curved upwardly; FIG. 2 is a conventional lens injection molding die. A schematic perspective view of the back side, the conventional injection molding die 1 has a lower curved surface structure 11 which is also curved upwardly. In the manufacturing process of the optical lens, the melt flows from the gate 12 into the chamber of the conventional injection molding die, and the chamber is defined by the upper curved structure and the lower curved structure, and a new system can be taken out after the melt is cooled. A curved optical lens.

Figure 3 is a cross-sectional view taken along line A-A of Figure 1 as a section angle. In FIG. 3, since the lower curved structure 11 is arched toward the chamber 15, most of the melt is guided to flow toward the two ring sides of the lower curved structure 11, as indicated by the fluid pointing arrow 17; The portion of the melt then slowly flows across the lower curved structure 11 from above the lower curved structure 11, as indicated by the fluid pointing arrow 18.

However, the channel height on the two ring sides of the chamber 15 of the conventional injection molding die 1 is higher than the channel height in the central region of the chamber 15 of the conventional injection molding die 1, and therefore the melt is less resistant to resistance. Flowing through the two ring sides, the flow rate on the two ring sides will be faster than the center area, which will result in the flow of the melt in the chamber during the manufacture of the lens as shown in FIG. However, the disadvantage is that the melt 8 has first filled the two loop sides (ie, the non-optical effective area of the lens) before the melt 8 has finished filling the central region (ie, the optically active region of the lens), and the final lens is formed. There will be voids or fuses 19 formed in the central region of the lens (i.e., the optically active area of the lens) that severely affect the optical performance of the lens.

In view of the above, in order to be able to manufacture and manufacture optical lenses that can be used, it is an object of the art to provide an injection molding die capable of producing lenses having good optical properties.

The main purpose of the present invention is to provide a well-formed optical lens and an injection molding die, which are provided with a plurality of spoiler structures to adjust the flow rate and direction of the melt at the non-optical effective area of the optical lens, thereby avoiding the void. A large number of holes or melt lines or stress residual effects or birefringence blocks are formed at the optically effective area of the optical lens.

One preferred embodiment of the present invention is to provide an optical lens injection molding. A mold for injecting a melt to form an optical lens, the optical lens injection molding die comprising a disk mold holder and a nozzle. The disc mold base defines a cavity chamber and a gate communicating with the cavity chamber, the cavity chamber including: an optical effective area central flow passage defined in the interior of the disc mold base Between an upper curved surface and a lower curved surface, the optical lens has an outer shape corresponding to the upper curved surface and the lower curved surface; and a non-optical effective region circumferential flow path surrounding and communicating with the optical effective region central flow path and the gate Connected, wherein the disc-shaped die holder is formed with a plurality of spoiler structures in the circumferential flow path of the non-optical effective region. The nozzle is coupled to the disc mold base, and a melt is injected into the cavity chamber through the gate, wherein the spoiler structures block the flow of the melt in the circumferential flow path of the non-optical effective region, such that The melt preferentially fills the central active channel of the optically active region.

In a preferred embodiment, the disc mold base is a disc-shaped mold base, and the spoiler structures are a plurality of spoiler bumps and/or spoiler pockets.

In a preferred embodiment, the number of the nozzles is plural.

In a preferred embodiment, the disc 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 cavity chamber.

In a preferred embodiment, the spoiler structures are annularly arranged in the annular flow path of the non-optical effective area and surround the central flow path of the optical effective area.

In a preferred embodiment, at least one of the spoiler structures is disposed adjacent to the gate of the non-optical active area circumferential flow path.

In a preferred embodiment, two of the spoiler structures are disposed adjacent to the gate of the non-optical effective area circumferential flow path, and the injection direction of one of the gates is a reference line, and is symmetrically disposed on Both sides of the baseline.

In a preferred embodiment, the center of curvature of the upper curved surface and the lower curved surface The center of curvature is on the same side of the disc-shaped mold base.

In a preferred embodiment, the upper curved surface and the lower curved surface are upwardly arched, and the spoiler structures protrude upward toward the upper curved surface.

Another preferred embodiment of the present invention is to provide an optical lens obtained by injection molding of an optical lens injection molding die, the optical lens comprising: a mirror body, an optical effective area, and a non-optical effective area; The complex spoiler corresponds to the structure. The optically active region is located in a central portion of the mirror body for a plurality of beams to pass through. The non-optical effective area is located at a peripheral portion of the mirror body and surrounds the optically active area. The spoiler corresponding structures are formed in the non-optical effective area and surround the optically active area.

In a preferred embodiment, the mirror body includes a gate surface, wherein at least one of the spoiler corresponding structures is adjacent to the gate surface.

In a preferred embodiment, the mirror body includes a gate surface, wherein two of the spoiler corresponding structures are adjacent to the gate surface, and a normal line direction of the gate surface is a reference line , symmetrically disposed on both sides of the reference line.

In a preferred embodiment, 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 in the same direction.

In a preferred embodiment, the inner surface of one of the spoiler corresponding structures is curved and arched in the same direction as the upper curved surface and the lower curved surface.

In a preferred embodiment, a sprayed layer is formed on the non-optical effective area, and the sprayed layer has a wave-eliminating effect to reduce reflection or diffusion of light.

In a preferred embodiment, the spoiler corresponding structures are a plurality of spoiler corresponding recess structures and/or spoiler corresponding protrusion structures.

1‧‧‧ injection molding

11‧‧‧ Lower surface structure

12‧‧‧Gate

15‧‧‧ chamber

19‧‧‧ holes or melting lines

2‧‧‧Optical lens injection molding die

21‧‧‧Disc die holder

21a‧‧‧Upper mold base

21b‧‧‧ lower mold base

210‧‧‧ cavity chamber

210a‧‧‧The central active channel of the optical effective area

210b‧‧‧Non-optical effective zone circumferential flow channel

211‧‧‧ gate

212‧‧‧Upper inner surface

212a‧‧‧ lower surface

213‧‧‧ lower inner surface

213a‧‧‧ lower surface

214‧‧‧ spoiler structure

22‧‧‧Nozzles

29‧‧‧ holes or melting lines

4‧‧‧Optical lenses

40‧‧‧Mirror body

40a‧‧‧Optical effective area

40b‧‧‧Non-optical effective area

43‧‧‧Gate Noodle

44‧‧‧Scattering corresponding structure

45‧‧‧ Spraying layer

8‧‧‧ Melt

9‧‧‧ Melt

L‧‧‧ baseline

P‧‧‧ surface vertices

Figure 1 is a perspective view of the front side of a conventional injection molding die.

Figure 2 is a perspective view of the back of a conventional injection molding die.

Fig. 3 is a cross-sectional view showing the conventional injection molding die of Fig. 1 taken along the line A-A.

Figure 4 is a diagram showing the flow of melt in a chamber during the manufacture of a lens by a conventional injection molding die.

Fig. 5 is a perspective view showing the front side of the optical lens injection molding die of the present invention.

Figure 6 is a perspective view of the back side of the optical lens injection molding die of the present invention.

Fig. 7 is a cross-sectional view showing the optical lens injection molding die of Fig. 5 taken along the line B-B.

Figure 8 is a schematic plan view of the optical lens of the present invention.

Fig. 9 is a schematic view showing the corresponding plane and section of the optical lens of the present invention.

Fig. 10 is a view showing the flow of the melt in the cavity chamber during the manufacture of the optical lens by the optical lens injection molding mold of the present invention.

5 is a schematic perspective view of the front side of the optical lens injection molding die of the present invention; FIG. 6 is a schematic perspective view of the back side of the optical lens injection molding die of the present invention; FIG. 7 is a cross-sectional view taken along line B-B of FIG. As shown in FIG. 5 to FIG. 7, the optical lens injection molding die 2 of the present invention comprises a disk-shaped die holder 21 and a nozzle 22, and the nozzle 22 is coupled to the disk-shaped die holder 21, and the interior thereof is empty. They are also connected. The upper surface of the disc-shaped mold base 21 is arched upward in an arc shape, and a curved surface apex P is formed at the center point to manufacture an optical lens having a similar curved surface.

The interior of the disc mold base 21 defines a cavity chamber 210 (see FIG. 7) and a gate 211 that communicates with the cavity chamber 210 (see FIGS. 5 and 6). In detail, during the manufacturing process, the melt system flows out of the nozzle 22 and is injected into the cavity chamber 210 through a gate 211. In the manufacturing process of optical lens injection molding, the melt 9 will gradually fill the cavity chamber 210 (please refer to the oblique line region of Fig. 10 for the flow of the melt 9), waiting for melting. After the body 9 is solidified, an optical lens can be taken out by cutting or cutting, and then used as a lens assembly. As for the material of the melt 9 referred to herein, it may be a molten plastic, a molten glass or other thermoplastic transparent material.

Referring to FIG. 7, the disc-shaped mold base 21 of the optical lens injection molding die 2 has an upper inner surface 212 and a lower inner surface 213, and an upper inner surface 212 and a lower inner surface 213 are defined between the optical lenses. The contoured cavity chamber 210 is contoured. The cavity chamber 210 is a flow channel for the melt 9 to flow through, and includes an optical effective region central flow channel 210a and a non-optical effective region circumferential flow channel 210b. The optical effective region central flow channel 210a is defined on the upper inner surface. The upper surface 212a of 212 and the lower surface 213a of the lower inner surface 213 are between.

The upper curved surface 212a and the lower curved surface 213a may both be arched upward in an arc shape. 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 disk mold base 21. And since the shape of the optical lens after the solidification of the melt 9 is corresponding to the inner surface 212 and the lower inner surface 213 of the disc-shaped mold base 21, the solidified melt 9 can be based on the inner surface of the actual disc-shaped mold base and The lower inner surface has a different contour and is designed to have a contour such as a convex-concave lens, a meniscus lens, a convex-convex lens, and a concave-concave lens.

Fig. 8 is a schematic plan view showing the surface of the optical lens produced by using the optical lens injection molding die 2 of the present invention; Fig. 9 is a schematic view showing the corresponding surface and cross section of the optical lens of the present invention, and referring to Figs. 8 and 9 together. As described above, in the optical lens 4 manufactured by the optical lens injection molding die 2 of the present invention, the optical lens 4 includes a mirror body 40, a curved surface 41 formed on the mirror body 40, and a lower curved surface 42, on which The curved surface 41 and the lower curved surface 42 are formed corresponding to the upper surface 212 and the lower inner surface 213 of the optical lens injection molding die 2, so in the embodiment, the curved surface 41 and the lower curved surface 42 of the optical lens 4 also have the same orientation. Curved arches.

Furthermore, the optical lens 4 further includes an optical effective area 40a defined on the mirror body 40 and a non-optical effective area 40b. In a preferred embodiment, the optically active region 40a is located in a central portion of the mirror body 40 for aligning with a source of light, and the plurality of beams from the source of light can pass through the optically active region 40a. The non-optical effective area 40b is located at the peripheral portion of the mirror body 40 and surrounds the surrounding optical effective area 40a.

It should be noted here that after the melt 9 is solidified but the newly produced optical lens 4 has not been taken out from the optical lens injection molding die 2, the optical effective region 40a of the optical lens 4 is in the optical cavity of the cavity chamber 210. The effective area central flow channel 210a, the non-optical effective area 40b of the optical lens 4 is located in the non-optical effective area circumferential flow channel 210b of the cavity chamber 210, which is the phase of the optical lens 4 and the optical lens injection molding die 2 during molding. Corresponding to the regional relationship.

Next, the non-optical effective area circumferential flow path 210b will be described. From FIGS. 6 and 7, it is apparent that the non-optical effective area circumferential flow channel 210b surrounds and communicates with the optical effective area central flow path 210a, and the spoiler structure 214 protrudes upward from the lower inner surface 213 toward the upper inner surface 212, and protrudes Formed in the non-optical effective area circumferential flow channel 210b. The optical lens injection molding die 2 of the present invention is provided with a plurality of spoiler structures 214 for the purpose of non-optical effective flow when the melt 9 is injected into the cavity chamber 210. The melt 9 of the circumferential channel 210b performs the function of the turbulence deceleration, and the melt 9 of the central active channel 210a of the optical effective region, which is not provided with the turbulent structure, continues to fill the cavity without interference and without deceleration. Room 210. It should be particularly noted herein that the spoiler structure 214 can be purely a plurality of spoiler bumps, or a combination of a plurality of spoiler bumps and spoiler pockets, or a purely complex spoiler pocket. For convenience of description, the present embodiment uses the spoiler structure 214 as a plurality of spoiler bumps as an example, but is not limited thereto.

In a preferred embodiment, as shown in FIG. 10, the flow velocity of the melt 9 of the central active flow path 210a of the optical effective region is similar to the flow velocity of the melt 9 of the non-optical effective region circumferential flow channel 210b, so that The optical effective area central flow path 210a is filled before the melt 9 has filled the non-optical effective area circumferential flow path 210b.

With the above arrangement, the optical effective area central flow path 210a is filled with priority over the non-optical effective area circumferential flow path 210b, and the optical effective area central flow path 210a will not be formed with voids or melting lines 29. That is, when the melt 9 solidifies to form an optical lens, corresponding to the spoiler structure 214 of the optical lens injection molding die 2, the optical lens 4 will have a plurality of spoiler corresponding structures 44 formed in the non-optical effective region 40a, and the turbulence The respective structures 44 are spaced apart and arranged in a ring shape around the optically active area 40a. Moreover, the holes or the fuses 29 are also formed in the non-optical effective area 40b of the optical lens 4, and the defects such as the holes or the melting lines 29 existing in the non-optical effective area 40b of the optical lens 4 are not affected at all. Optical properties of optical lenses. Because, in general, the non-optical effective area 40b is designed to be free of the passage of the beams to reduce reflection or diffusion during imaging. In view of the above arrangement, voids or melt lines or improper double or multi-refractive-index blocks will not be formed in the optically effective area of the optical lens 4, which has a very large improvement effect on the optical performance of the optical lens 4.

In addition, the arrangement of the spoiler corresponding structures 44 formed on the non-optical effective area 40b of the optical lens 4 can have a guiding effect, so that the optical lens 4 allows diffusion when the lens is combined with a plurality of lenses. The light onto it is gradually introduced into the interior of the spoiler corresponding structure 44 of the optical lens 4 without being leaked out. Moreover, the spoiler corresponding structure 44 of the optical lens 4 is formed corresponding to the contour of the spoiler structure 214 of the optical lens injection molding die 2, so that the spoiler corresponding structure 44 can be correspondingly matched to become a spoiler corresponding recess structure and/or Flow corresponding to the protruding structure. Further, in the embodiment of the optical lens injection molding die 2, the spoiler structure 214 is a preferred example of the plurality of spoiler bumps. Here, the spoiler corresponding structure 44 of the optical lens 4 is a spoiler corresponding recess structure.

Preferably, the non-optical effective area 40b of the optical lens 4 is also spray-sprayed to form a sprayed layer 45 having a wave-eliminating effect to reduce reflection or diffusion of light.

In addition, it should be additionally noted that since the melted mold 9 needs to be opened after the solidification of the melt 9 to push out the solidified optical lens 4, it is preferably arranged as shown in FIG. 5 and FIG. The die holder 21 includes an upper die holder 21a and a lower die holder 21b. The upper die holder 21a and the lower die holder 21b are assembled to form a cavity chamber 210. After the optical lens is solidified and formed, the upper mold base 21a and the lower mold base 21b can be manipulated and separated to obtain the finished optical lens 4. Furthermore, in order to cope with the general optical lens, the disc-shaped mold base 21 is designed as a disc-shaped mold base 21.

In order to achieve the best effect of the arrangement of the spoiler structure 214, the spoiler structure 214 is arranged in a ring shape in the non-optical effective area circumferential channel 210b, and surrounds the optical effective area central flow path 210a to make the non-optical effective area ring The melt 9 of the peripheral flow path 210b generates turbulence and decelerates. In a preferred embodiment, at least one of the spoiler structures 214 is disposed adjacent the gate 211 of the non-optical active area circumferential channel 210b. At least one of the spoiler corresponding structures 44 is adjacent to one of the gate faces 43 of the optical lens 4 in the perspective of the optical lens 4.

In another preferred embodiment, two of the spoiler structures 214 are disposed adjacent to the gate 211 of the non-optical effective region circumferential channel 210b, and the implantation direction of one of the gates 211 is a reference line, symmetric. It is disposed on both sides of the reference line, thereby blocking the flow of the melt flowing into the non-optical effective area circumferential flow channel 210b on both sides, and achieving the function of deceleration. Thus, the optical lens 4 in which the two of the spoiler corresponding structures 44 are formed adjacent to the gate surface 43 can be manufactured. If the normal direction of one of the gate faces 43 of the optical lens 4 is a reference line L, the spoiler correspondingly Two of the structures 44 are symmetrically formed on both sides of the reference line L, respectively.

In summary, the optical lens injection molding die of the present invention has a complex spoiler structure, thereby reducing the flow velocity of the melt in the circumferential flow path of the non-optical effective region, so that the melt preferentially fills the central flow path of the optical effective region, thereby avoiding Defects such as open holes or melt lines or improper stress are formed in the optically effective area of the optical lens, which improves the optical lens yield. The placement of voids or fuses formed in the non-optical effective area of the optical lens does not affect the optical properties. And because the corresponding periodic spoiler corresponding structure arrangement strengthens the stress intensity of the lens, the lens group has strong force and tolerance tolerance when the lens group is formed into a mirror group.

The above embodiments are merely illustrative of the principles and effects of the present invention, as well as the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any person skilled in the art can make changes or equal arrangements that can be easily accomplished without departing from the technical spirit and spirit of the present invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the patent application described later.

29‧‧‧ holes or melting lines

4‧‧‧Optical lenses

40‧‧‧Mirror body

40a‧‧‧Optical effective area

40b‧‧‧Non-optical effective area

43‧‧‧Gate Noodle

44‧‧‧Scattering corresponding structure

L‧‧‧ baseline

Claims (16)

An optical lens injection molding die for injecting a melt to form an optical lens, and the optical lens injection molding die comprises: a disk-shaped die holder defining a cavity chamber and communicating with the cavity cavity a gate, the cavity chamber includes: an optical effective area central flow path defined between one of the curved surface and the lower curved surface of the disk mold base, such that the optical lens shape corresponds to the upper curved surface and the lower surface a curved surface; and a non-optical effective area circumferential flow path surrounding and communicating with the central flow path of the optical effective area, and communicating with the gate, wherein the disk mold base forms a plurality of spoiler structures in the circumferential flow path of the non-optical effective area; And a nozzle coupled to the disc mold base, through which a melt is injected into the cavity chamber, wherein the spoiler structures block the flow of the melt in the circumferential flow path of the non-optical effective region, The melt is preferentially filled to fill the central active channel of the optical active zone. The optical lens injection molding die of claim 1, wherein the disc-shaped mold base is a disc-shaped mold base, and the spoiler structures are plural spoiler bumps and/or spoiler pockets. . The optical lens injection molding die of claim 1, wherein the disk die holder comprises an upper die holder and a lower die holder, and the upper die holder and the lower die holder are combined to form the cavity cavity. room. The optical lens injection molding die of claim 1, wherein the spoiler structures are arranged in a ring shape in the circumferential flow path of the non-optical effective region, and A central flow path around the optically active area. The optical lens injection molding die of claim 1, wherein at least one of the spoiler structures is disposed adjacent to the gate of the non-optical effective region circumferential flow path. The optical lens injection molding die of claim 1, wherein two of the spoiler structures are disposed adjacent to the gate of the non-optical effective region circumferential flow channel and injected into one of the gates The direction is a reference line and is symmetrically disposed on both sides of the reference line. The optical lens injection molding die of claim 1, wherein a center of curvature of the upper curved surface and a center of curvature of the lower curved surface are located on the same side of the disc-shaped mold base. The optical lens injection molding die of claim 1, wherein the upper curved surface and the lower curved surface are upwardly arched, and the spoiler structures protrude upward toward the upper curved surface. The optical lens injection molding die according to claim 1, wherein the number of the nozzles is plural, and the nozzles are coupled to the disk mold base. An optical lens is obtained by injection molding of an optical lens injection molding die, the optical lens comprising: a mirror body; an optical effective region located at a central portion of the mirror body for a plurality of beams to pass through; a non-optical effective a region, located at a peripheral portion of the mirror body, surrounding the optically active region; and a plurality of spoiler corresponding structures formed in the non-optical effective region and surrounding the optically active region. The optical lens of claim 10, wherein the mirror body comprises a gate surface, wherein at least one of the spoiler corresponding structures is adjacent to the gate surface. The optical lens of claim 10, wherein the mirror body comprises a gate surface, wherein two of the spoiler corresponding structures are adjacent to the gate surface, and one of the gate surfaces is The line direction is a reference line and is symmetrically disposed on both sides of the reference line. The optical lens of 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. The optical lens of claim 13, wherein an inner surface of each of the spoiler corresponding structures is curved in the same direction as the upper curved surface and the lower curved surface. The optical lens of claim 10, wherein the non-optical effective area is formed with a sprayed layer having a wave-eliminating effect to reduce reflection or diffusion of light. The optical lens of claim 10, wherein the spoiler corresponding structures are a plurality of spoiler corresponding recess structures and/or spoiler corresponding protrusion structures.