TW201520024A - Mold configured to form a lens, lens and manufacturing method of a lens - Google Patents

Abstract

A mold configured to form a lens is provided. The mold includes a cavity, an exhaust chamber, a first exhaust channel and a least one second exhaust channel. The exhaust chamber is disposed around the cavity. The first exhaust channel connects the exhaust chamber with the cavity and has a first depth. The second exhaust channel communicates the exhaust chamber with the cavity and has a second depth. The first depth is different from the second depth. Besides, a lens and manufacturing method of lens are also provided.

Description

Mold, lens and lens manufacturing method for forming lens

The present invention relates to a mold, a lens, and a method of manufacturing a lens for forming a lens.

In recent years, as electronic products are moving toward light, thin, short, and small trends, the length of the lens disposed on electronic products (such as mobile phones with photography functions) has also been reduced, so the upper lens is also relatively thin. thickness. However, when a thin lens is formed, it is liable to cause a problem of poor molding.

In particular, the cavity structure from which the lens is made typically includes a central optically active region and a surrounding non-optical active region. When the liquid resin material used to form the lens is injected into the cavity, it will flow smoothly around the cavity, but due to the gap around the cavity and the center of the cavity, the resin material will enter the center of the cavity. Resistance is generated, so the resin material also flows in the peripheral direction, and the resin material flows to the periphery of the cavity faster than the center of the cavity. Thus, once the resin material is saturated around the cavity, and the mold is not effectively exhausted, the air injected into the cavity with the resin is coated inside the lens to form a common wind phenomenon. This wind phenomenon In the optical field of the lens, it will affect the transmittance and refractive index of the lens.

In order to solve this problem, the existing method is to provide an exhaust passage communicating with the cavity on the surface of the mold on one side of the cavity, but the depth of the exhaust passage is not easy to handle. If the depth of the exhaust passage is too shallow, the air in the cavity will not flow out, but if the depth of the exhaust passage is too deep, the resin material in the cavity will overflow into the exhaust passage and after the lens is formed. The portion of the lens that produces flash (ie, the so-called burrs). If the burr is more prominent with respect to other edge portions of the lens, it may cause the lens to be easily deviated from the optical axis position when assembled, thereby affecting the image quality.

The present invention provides a mold for forming a lens which can provide a lens which is optically good and easy to assemble, and which simplifies the process of the lens.

The present invention provides a lens that is easy to assemble and has a low cost.

The present invention provides a method of manufacturing a lens which can provide a lens which is excellent in optical quality and easy to assemble, and has a relatively simplified process.

A mold for forming a lens according to an embodiment of the present invention includes a cavity, an exhaust chamber, a first exhaust passage, and at least a second exhaust passage. The exhaust chamber is located at the periphery of the cavity. The first exhaust passage communicates with the exhaust chamber and the cavity and has a first depth. The second exhaust passage communicates with the exhaust chamber and the cavity and has a second depth. The first depth is different from the second depth.

A lens according to an embodiment of the invention includes a first optical surface and a second light School face and an edge. The second optical surface is opposite the first optical surface. The edge connects the first optical surface and the second optical surface, and the edge includes an overflow portion and at least one circular arc portion. At least one arc portion is connected to the flash portion, wherein a distance from the flash portion to the center of the lens is smaller than a distance from the arc portion to the center of the lens.

A method of manufacturing a lens according to an embodiment of the present invention includes the following steps. A mold is provided to form a cavity, wherein the cavity communicates with the at least one second exhaust passage via a first exhaust passage to an exhaust chamber located at a periphery of the cavity. The first exhaust passage and the second exhaust passage have a first depth and a second depth, respectively, and the first depth is different from the second depth. A material is filled into the cavity, and the gas in the cavity is discharged to the exhaust chamber via the first exhaust passage and the second exhaust passage. The material is allowed to cool and solidify to form a lens within the cavity.

In an embodiment of the invention, the mold has an escape cross section and at least one arc inner surface to define a cavity. The first exhaust passage communicates with the cavity via the escape section, and the distance from the escape section to the center of the cavity is less than the distance from the inner surface of the arc to the center of the cavity.

In an embodiment of the invention, the mold further includes a injection hole communicating with the cavity, and the injection hole and the first exhaust passage are respectively disposed on opposite sides of the cavity.

In an embodiment of the invention, the distance between the intersection of the injection hole and the cavity to the center of the cavity is smaller than the distance from the inner surface of the arc to the center of the cavity.

In an embodiment of the invention, the cross-sectional area of the escape cross section is substantially the same as the cross-sectional area of the injection hole and the cavity.

In an embodiment of the invention, the first depth is greater than the second depth.

In an embodiment of the invention, the first depth ranges from 0.015 mm to 0.025 mm and the second depth ranges from 0.005 mm to 0.007 mm.

In an embodiment of the invention, the first exhaust passage and the second exhaust passage are arranged along a circumference of the cavity, and the first exhaust passage and the second exhaust passage communicate with each other.

In an embodiment of the invention, the mold includes a first mold and a second mold. A cavity, an exhaust chamber, a first exhaust passage, and at least a second exhaust passage are formed between the first mold and the second mold. The first depth is a spacing between the first mode and the second mode at the first exhaust passage, and the second depth is a spacing between the first mode and the second mode at the second exhaust passage.

In an embodiment of the invention, the lens further includes a convex portion. The convex portion is located on the opposite side of the overflow portion and is connected to the circular arc portion, wherein the distance from the convex portion to the center of the lens is smaller than the distance from the circular arc portion to the center of the lens, and the shapes of the flash portion and the convex portion are different.

In an embodiment of the invention, wherein the material does not overflow into the second exhaust passage when the material is filled in the cavity, the material slightly spills into the first exhaust passage.

In an embodiment of the invention, portions of the material that are slightly spilled into the first exhaust passage are not removed.

In an embodiment of the invention, the mold includes a first mold and a second mold, and the method of forming the cavity includes superposing the first mold and the second mold to form Chengmo points. The mold simultaneously forms an exhaust chamber, a first exhaust passage, and at least a second exhaust passage, wherein the first depth is a distance between the first mold and the second mold at the first exhaust passage, and the second depth is The spacing between the die and the second die at the second exhaust passage.

Based on the above, the mold and the lens manufacturing method of the embodiment of the present invention can effectively reduce the exhaust cavity by the design that the first exhaust passage and the second exhaust passage have different first depths and second depths, respectively. The area where the cavities communicate with each other can still make the air in the cavity easy to circulate, thereby avoiding the occurrence of the wind phenomenon, and further forming a lens with good optical quality and easy assembly. On the other hand, since the mold narrows the portion where the exhaust chamber communicates with the cavity, it can also effectively reduce the risk that the material in the cavity will overflow into the exhaust chamber, thereby reducing the lens to be formed at the edge of the lens after molding. The range of the flash section. As such, the flashing portion of the lens of the embodiment of the present invention will not need to be removed, thereby helping to save the manufacturing process and cost of the lens without affecting the subsequent assembly process of the lens.

The above described features and advantages of the invention will be apparent from the following description.

100,500‧‧‧ mould

110‧‧‧ cavity

120‧‧‧Exhaust chamber

130‧‧‧First exhaust passage

140, 540‧‧‧second exhaust passage

150‧‧‧ injection hole

400‧‧‧ lens

410‧‧‧First optical surface

420‧‧‧second optical surface

430‧‧‧ edge

431‧‧‧Ferry Department

432‧‧‧Arc Department

433‧‧‧ convex

MD1‧‧‧ first model

MD2‧‧‧ second mode

SE‧‧‧ escape section

SC‧‧‧ arc inner surface

D, d1, d2‧‧ depth

L1, L2, L3, W1, W2, W3‧‧‧ distance

C110, C400‧‧‧ Central

A-A, B-B‧‧‧ cut line

S110, S120, S130‧‧‧ steps

1 is a side elevational view of a mold for forming a lens in accordance with an embodiment of the present invention.

2A is a top view of the cavity of FIG. 1.

Figure 2B is a cross-sectional view of the cavity of Figure 2A taken along line A-A.

2C is a cross-sectional view of the cavity of FIG. 2A taken along line B-B.

3 is a flow chart of a method of manufacturing a lens according to an embodiment of the present invention.

4A is a front elevational view of a lens in accordance with an embodiment of the present invention.

4B is a side elevational view of the lens of FIG. 4A.

4C is a cross-sectional view of the lens of FIG. 4A.

Figure 5 is a front elevational view of another embodiment of a mold for forming a lens in accordance with one embodiment of the present invention.

1 is a side elevational view of a mold for forming a lens in accordance with an embodiment of the present invention. 2A is a top view of the second mold of FIG. 1. Referring to FIG. 1 to FIG. 2A , the mold 100 for forming a lens of the embodiment includes a cavity 110 , an exhaust cavity 120 , a first exhaust passage 130 , at least a second exhaust passage 140 , and a note . Hole 150. For example, as shown in FIG. 1 , in the embodiment, the mold 100 includes a first mold MD1 and a second mold MD2, and a cavity 110 and a row are formed between the first mold MD1 and the second mold MD2. The air chamber 120, the first exhaust passage 130, and the at least one second exhaust passage 140.

Further, as shown in FIG. 2A, the mold 100 has an escape section SE and at least one arc inner surface SC to define the cavity 110. On the other hand, in the present embodiment, the injection hole 150 communicates with the cavity 110, and is disposed on the opposite side of the cavity 110 from the first exhaust passage 130, respectively. In more detail, the first exhaust passage 130 communicates with the cavity 110 via the escape section SE, wherein the cross-sectional area of the escape section SE is substantially The same as the cross-sectional area where the injection hole 150 meets the cavity 110. In addition, the first exhaust passage 130 and the second exhaust passage 140 are arranged along the circumference of the cavity 110, and the exhaust chamber 120 is located at the periphery of the cavity 110, and the first exhaust passage 130 and the second exhaust passage 140 are connected to each other. The air chamber 120 and the cavity 110, and the first exhaust passage 130 and the second exhaust passage 140 are also in communication with each other. The structural design of the first exhaust passage 130 and the second exhaust passage 140 will be further explained below with reference to FIGS. 2B to 2C.

Figure 2B is a cross-sectional view of the cavity of Figure 2A taken along line A-A. 2C is a cross-sectional view of the cavity of FIG. 2A taken along line B-B. Referring to FIG. 2B and FIG. 2C , the exhaust chamber 120 has a depth D, and the first exhaust passage 130 and the second exhaust passage 140 respectively have a first depth d1 and a second depth d2, and the first depth d1 Different from the second depth d2. In more detail, please refer to FIG. 1 , FIG. 2B and FIG. 2C simultaneously, the depth D is the distance between the first mode MD1 and the second mode MD2 at the exhaust cavity 120 , and the first depth d1 is the first mode MD1 and the second The spacing of the die MD2 at the first exhaust passage 130, and the second depth d2 is the spacing of the first die MD1 and the second die MD2 at the second exhaust passage 140. In more detail, in the embodiment, the first depth d1 is greater than the second depth d2, and the first depth d1 and the second depth d2 are both smaller than the depth D. For example, the range of the depth D falls between 0.1 mm and 0.2 mm, the range of the first depth d1 falls between 0.015 mm and 0.025 mm, and the range of the second depth d2 falls between 0.005 mm and 0.007 mm. However, the invention is not limited thereto. In addition, it should be noted that the above numerical ranges are merely illustrative and are not intended to limit the invention.

In this way, the mold 100 passes through the first exhaust passage 130 and the second exhaust The channel 140 has different structural designs of the first depth d1 and the second depth d2, respectively, which can effectively reduce the area of the exhaust cavity 120 communicating with the cavity 110, and still enable the air in the cavity 110 to be easily circulated to avoid The formation of a wind phenomenon can further form a lens with good optical quality. In addition, since the mold 100 reduces the portion of the exhaust chamber 120 that communicates with the cavity 110, the risk of the material in the cavity 110 overflowing into the exhaust chamber 120 can be effectively reduced, thereby reducing the lens formation. The area of the flash that is produced by the edge of the lens.

In addition, referring to FIG. 2A again, in the present embodiment, the distance L1 of the escape section SE to the center C110 of the cavity is smaller than the distance L2 of the inner surface SC of the arc to the center C110 of the cavity, and the injection hole 150 and the cavity 110 The distance L3 from the communication to the center C110 of the cavity is smaller than the distance L2 from the inner surface SC of the circular arc to the center C110 of the cavity. Thus, when the material is filled into the cavity 110 by the injection hole 150, the convex portion formed by the overflow portion and the injection hole 150 can be restricted to a certain range, thereby avoiding the subsequent assembly process that affects the molded lens.

3 is a flow chart of a method of manufacturing a lens according to an embodiment of the present invention. Referring to FIG. 3, in the embodiment, the manufacturing method of the lens can be performed by using the mold 100 of FIG. 1, for example, but the invention is not limited thereto. The method of manufacturing the lens of this embodiment includes the following steps. First, in step S110, a mold 100 is provided to form a cavity 110. For example, referring to FIG. 1 , the method for forming the cavity 110 of the present embodiment includes superposing the first mold MD1 of the mold 100 and the second mold MD2 to form the cavity 110, wherein the cavity 110 passes through the first row. The air passage 130 communicates with the second exhaust passage 140 to the exhaust chamber 120 located at the periphery of the cavity 110. On the other hand, Figure 1. 2B and 2C, the exhaust chamber 120 has a depth D, and the first exhaust passage 130 and the second exhaust passage 140 have a first depth d1 and a second depth d2, respectively, and the first depth d1 Different from the second depth d2. In more detail, the first depth d1 is greater than the second depth d2, and the first depth d1 and the second depth d2 are both smaller than the depth D.

Next, step S120 is performed to fill a material into the cavity 110, and the gas in the cavity 110 is discharged to the exhaust cavity 120 via the first exhaust passage 130 and the second exhaust passage 140. In this embodiment, the material of the material is, for example, a resin material, but the invention is not limited thereto. In more detail, in the embodiment, the mold 100 has different first depth d1 and second depth d2 by the first exhaust passage 130 and the second exhaust passage 140, respectively, and effectively reduces the exhaust chamber. In the case where the area of the cavity 110 is in contact with the cavity 110, the air in the cavity 110 can be easily circulated to avoid the occurrence of a wind phenomenon, and a lens of good optical quality can be formed. For example, when the material is filled in the cavity 110, the air in the cavity 110 can be made first by vacuuming the cavity 110 or by injecting resin into the cavity 110 itself. The exhaust passage 130 and the second exhaust passage 140 are output to the exhaust chamber 120 such that the space in the cavity 110 can be completely filled with material and the material does not overflow to the second exhaust passage 140. Further, in the present embodiment, the material slightly overflows to the first exhaust passage 130 to form an overflow portion 431 (shown in FIG. 4A).

Thereafter, step S130 is performed to cool and solidify the material to form a lens in the cavity 110. In the present embodiment, since the mold 100 reduces the portion of the exhaust chamber 120 that communicates with the cavity 110, the risk of the material in the cavity 110 overflowing into the exhaust chamber 120 can be effectively reduced, thereby reducing the risk. The lens is formed at the edge of the lens The range of flash sections produced. Thus, when the material is filled into the cavity 110 by the injection hole 150, the convex portion formed by the overflow portion and the injection hole 150 can be restricted to a certain range, and the material slightly overflows to the first exhaust passage 130. The portion may need not be removed, helping to save the manufacturing process of the molded lens, and thus reducing the manufacturing cost without affecting the subsequent assembly process of the molded lens.

4A is a front elevational view of a lens in accordance with an embodiment of the present invention. 4B is a side elevational view of the lens of FIG. 4A. 4C is a cross-sectional view of the lens of FIG. 4A. Referring to FIG. 4A to FIG. 4C , in the embodiment, the lens 400 can be formed by using the mold 100 of FIG. 1 and the mold 100 of FIG. 3 , but the invention is not limited thereto. In the present embodiment, the lens 400 includes a first optical surface 410, a second optical surface 420, and an edge 430. The second optical surface 420 is opposite to the first optical surface 410, and the edge 430 is connected to the first optical surface 410 and the second optical surface 420, and the edge 430 includes an overflow portion 431, at least one arc portion 432, and a convex portion 433. . At least one arc portion 432 is connected to the flash portion 431, wherein a distance W1 from the flash portion 431 to the lens center C400 is smaller than a distance W2 from the arc portion 432 to the lens center C400. The convex portion 433 is located on the opposite side of the overflow portion 431 and is connected to the circular arc portion 432. The distance W3 of the convex portion 433 to the lens center C400 is smaller than the distance W2 between the circular arc portion 432 and the lens center C400.

In this way, since the flash portion 431 and the convex portion 433 are both limited to a certain range, they do not need to be removed, thereby contributing to reducing the manufacturing process and manufacturing cost of the lens 400 without affecting the subsequent assembly process of the lens 400. Still, the lens 400 can be easily assembled into the lens without causing the optical axis to deviate. In addition, in the present embodiment, as shown in FIG. 4A, the flashing portion 431 is an arcuate edge 430, and the convex portion The shape of 433 is different. In other words, the lens 400 has an asymmetrical shape, which will help to make the lens 400 easy to recognize the assembly direction when assembled, and avoid misjudgment during assembly.

In addition, the first exhaust passage 130 and the second exhaust passage 140 of the mold 100 are exemplified as being in communication with each other, but the invention is not limited thereto. Further description of possible variations of the first exhaust passage 130 and the second exhaust passage 140 will be made below in conjunction with FIG.

Figure 5 is a front elevational view of another embodiment of a mold for forming a lens in accordance with one embodiment of the present invention. Referring to FIG. 5, the mold 500 of the present embodiment is similar to the mold 100 of FIG. 2A, and the differences are as follows. In the present embodiment, the mold 500 has a plurality of second exhaust passages 540, and the first exhaust passages 130 and the second exhaust passages 540 of the mold 500 are disposed to be separated from each other. In this embodiment, since the mold 500 can also have different first depth d1 and second depth d2 structure design, the first exhaust passage 130 and the second exhaust passage 540 can effectively reduce the exhaust cavity 120. The area communicating with the cavity 110 still allows the air in the cavity 110 to be easily circulated to avoid the occurrence of air entrainment and to effectively reduce the risk of material in the cavity 110 overflowing into the exhaust cavity 120. Therefore, the mold 500 also has the advantages mentioned in the mold 100, and will not be described again here. In addition, the mold 500 can also be used to perform the lens manufacturing method shown in FIG. 3 and to manufacture the lens 400 shown in FIG. 4A, and all have the advantages mentioned in the foregoing embodiments, and are not described herein again.

In summary, the mold and the lens manufacturing method of the embodiment of the present invention have different first depths and first portions by the first exhaust passage and the second exhaust passage, respectively. The two-depth design will effectively reduce the area where the exhaust chamber communicates with the cavity, and still allow the air in the cavity to be easily circulated to avoid the occurrence of air entrapment, thereby forming a lens of good optical quality. On the other hand, since the mold narrows the portion where the exhaust chamber communicates with the cavity, it can also effectively reduce the risk that the material in the cavity will overflow into the exhaust chamber, thereby reducing the lens to be formed at the edge of the lens after molding. The range of the flash section. As such, the flashing portion of the lens of the embodiment of the present invention will not need to be removed, thereby helping to save the manufacturing process and cost of the lens without affecting the subsequent assembly process of the lens. In addition, the shape of the flashing portion of the lens is different from that of the convex portion, which will help the lens to be assembled and easy to recognize the assembly direction, thereby avoiding misjudgment during assembly.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Mold

110‧‧‧ cavity

120‧‧‧Exhaust chamber

130‧‧‧First exhaust passage

140‧‧‧Second exhaust passage

150‧‧‧ injection hole

SE‧‧‧ escape section

SC‧‧‧ arc inner surface

L1, L2, L3‧‧‧ distance

C110‧‧‧Central

A-A, B-B‧‧‧ cut line

Claims (16)

A mold for forming a lens, comprising: a cavity; an exhaust cavity located at a periphery of the cavity; a first exhaust passage communicating with the exhaust cavity and the cavity and having a first depth; At least one second exhaust passage communicating with the exhaust cavity and the cavity and having a second depth, and the first depth is different from the second depth. The mold for forming a lens according to claim 1 has an escape cross section and at least one circular arc inner surface to define the cavity, and the first exhaust passage communicates via the escape cross section. a cavity, and the distance from the escape cross section to the center of the cavity is less than the distance from the inner surface of the arc to the center of the cavity. The mold for forming a lens according to claim 2, further comprising a injection hole communicating with the cavity, and the opposite of the injection hole and the first exhaust passage respectively disposed on the cavity side. The mold for forming a lens according to claim 3, wherein a distance between the injection hole and the cavity to the center of the cavity is smaller than a distance from the inner surface of the circular arc to the center of the cavity. The mold for forming a lens according to claim 3, wherein the cross-sectional area of the escape section is substantially the same as the cross-sectional area of the injection hole and the cavity. a mold for forming a lens according to claim 1, wherein The first depth is greater than the second depth. The mold for forming a lens according to claim 1, wherein the first depth ranges from 0.015 mm to 0.025 mm, and the second depth ranges from 0.005 mm to 0.007 mm. . The mold for forming a lens according to claim 1, wherein the first exhaust passage and the second exhaust passage are arranged along a circumference of the cavity, and the first exhaust passage and the first The two exhaust passages communicate with each other. The mold for forming a lens according to claim 1, comprising: a first mold; and a second mold, wherein the mold hole is formed between the first mold and the second mold a first depth is a distance between the first mold and the second mold at the first exhaust passage, and the second depth is the cavity, the first exhaust passage, and the at least one second exhaust passage a spacing between the first die and the second die at the second exhaust passage. A lens comprising: a first optical surface; a second optical surface opposite the first optical surface; and an edge, wherein the edge connects the first optical surface and the second optical surface, and the edge comprises: An overflow portion; and at least one arc portion connected to the flash portion, wherein a distance from the flash portion to a center of the lens is smaller than a distance from the arc portion to a center of the lens. The lens of claim 10, further comprising: a convex portion is disposed on an opposite side of the flashing portion and connected to the circular arc portion, wherein a distance from the convex portion to a center of the lens is smaller than a distance from the circular arc portion to a center of the lens, and the flashing portion and the The shape of the convex portion is different. A method of manufacturing a lens, comprising: providing a mold to form a cavity, wherein the cavity communicates with the at least one second exhaust passage via a first exhaust passage to an exhaust chamber at a periphery of the cavity; The first exhaust passage and the second exhaust passage respectively have a first depth and a second depth, and the first depth is different from the second depth; filling a material into the cavity, and Gas in the cavity is discharged to the exhaust chamber via the first exhaust passage and the second exhaust passage; and the material is cooled and solidified to form a lens in the cavity. The method of manufacturing the lens of claim 12, wherein the mold has an escape cross section and at least one arc inner surface, the first exhaust passage communicating with the escape cross section, and the escape cross section to the The distance from the center of the cavity is less than the distance from the inner surface of the arc to the center of the cavity. The method of manufacturing a lens according to claim 12, wherein when the material is filled in the cavity, the material does not overflow to the second exhaust passage, and the material slightly overflows to the first An exhaust passage. The method of manufacturing a lens according to claim 14, wherein a portion of the material that overflows to the first exhaust passage is not removed. The method of manufacturing a lens according to claim 12, wherein the mold comprises a first mold and a second mold, and the method of forming the mold cavity comprises: Superposing the first mold and the second mold to form the cavity, the mold simultaneously forming the exhaust chamber, the first exhaust passage, and the at least one second exhaust passage, wherein the first depth a spacing between the first die and the second die at the first exhaust passage, and the second depth is a spacing between the first die and the second die at the second exhaust passage.