TW201436979A - Camera lens and manufacturing method of lens module thereof - Google Patents

Abstract

The present invention discloses a camera lens and a manufacturing method of lens module thereof. The manufacturing method of lens module includes determining a first injecting forming lens, a second injecting forming lens and a connecting lens connecting the first injecting forming lens and the second injecting forming lens, and utilizing an injecting process to simultaneously forming the first injecting forming lens and the second injecting forming lens on the two lateral surface of the connecting lens. By utilizing the injecting process to produce the modular lens module, the assembly error while installing the optical lens in the camera lens can be reduced.

Description

Lens and lens group manufacturing method thereof

The present invention relates to a lens and a method of manufacturing the lens group thereof, and more particularly to a method of manufacturing a lens group by an injection process and assembling the lens, and a lens including the lens group produced by the injection process.

At present, electronic products have gradually evolved toward light, thin and versatile. For example, smart phones, not only thin and light, but also feature high-resolution screens and high-resolution lenses, so that users can record and shoot around the scene anytime, anywhere.

Among them, the current mobile phone lens has evolved to 8 million to 12 million pixels, and in order to be incorporated into a smart phone, the mobile phone lens must also be miniaturized. However, the assembly of plastic lenses in mobile phone lenses is currently at a low yield with high precision requirements. That is to say, during the assembly process, the relative position between the imaging lenses is only slightly misaligned, for example, an imaging lens is slightly tilted or displaced, which makes the entire mobile phone lens a defective product. For example, if the mobile phone lens has an assembly error, when the mobile phone screen displays the picture captured by the mobile phone lens, uneven color tone may appear at the edge of the picture, or distortion and dispersion may occur. The assembly error is one of the causes of the above phenomenon.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a method of manufacturing a lens and a lens group thereof to solve the problem of assembly error in the prior art.

According to an aspect of the present invention, a method of manufacturing a lens group includes: determining a first injection molding lens, a second injection molding lens, and a coupling lens connecting the first injection molding lens and the second injection molding lens in the lens group; And forming the first injection molding lens and the second injection molding lens on both sides of the coupling lens by using the injection process.

Preferably, the first injection molding lens may include a first surface and a second surface opposite to each other, and the second injection molding lens includes a third surface and a fourth surface opposite to each other, and the coupling lens is coupled to the second surface. And the third surface, the injection process further comprises: providing a mold, the mold may have a first cavity opposite to the first surface and the fourth surface; providing a coupling lens in the first cavity; and emitting the first transparent material In a cavity, the first injection molding lens and the second injection molding lens are formed on both sides of the coupling lens.

Preferably, before the step of providing the connecting lens in the first cavity, the method further comprises: providing a mold, the mold further comprising a second cavity having the same shape as the second surface and the third surface; and emitting the second transparent The material is in the second cavity to form a coupling lens; and the coupling lens is moved into the first cavity.

Preferably, the mold may include a male mold and a female mold, and the female mold includes a first mold cavity and a second mold cavity, and when the second transparent material is injected into the second cavity, the second transparent material is simultaneously formed. In the male mold, the step of moving the connecting lens into the first cavity further comprises: rotating the male mold to make the connecting lens enter the first cavity.

Preferably, the first transparent material has a melting temperature lower than the second transparent material.

According to another object of the present invention, a lens is provided which includes a lens barrel and a lens group. The lens barrel includes a lens receiving groove, and the lens is assembled in the lens receiving groove. The lens group includes a first injection molding lens, a second injection molding lens, and a coupling lens. The connecting lens has a first surface and a second surface opposite to each other, the first surface is coupled to the side surface of the first injection molded lens, and the second surface is coupled to the side surface of the second injection molding lens.

Preferably, the outer shape of the first surface may correspond to the outer shape of the side of the first injection molding lens to face the first surface and the side surface of the first injection molding lens, and the second surface may be combined with the second injection. The sides of the forming lens are externally shaped to correspond to each other to face the second side and the side of the second injection molding lens.

Preferably, the lens group is formed by a two-shot injection process, wherein the first injection molding lens and the second injection molding lens may be formed of a first transparent material, and the coupling lens may be formed of a second transparent material.

Preferably, the first transparent material has a melting temperature lower than the second transparent material.

Preferably, the lens group can be formed by an insert molding process.

According to the invention, the lens and the lens group manufacturing method thereof can reduce the tilt assembly error or the displacement assembly error of the imaging lens in the lens by the modular lens group, thereby improving the assembly yield. With optical quality.

99. . . Lens

101. . . Sensing unit

110. . . Lens barrel

111. . . Lens storage slot

112. . . First position

114. . . Second position

120. . . Lens group

121. . . First imaging lens

121a. . . First injection molding lens

121b, 131b, 132b. . . First side

121c, 131c, 132c. . . Second side

122. . . Second imaging lens

122a. . . Second injection molding lens

122b. . . Third side

122c. . . Fourth side

123. . . Third imaging lens

124. . . Fourth imaging lens

131, 131a. . . First connecting lens

132. . . Second connecting lens

198. . . Second lens group

199. . . First lens group

200, 300. . . Mold

201. . . First side wall

202. . . Second side wall

210. . . Cavity

220. . . Transparent material

221. . . First transparent material

222. . . Second transparent material

310. . . Public model

320. . . Master model

321. . . First groove

322. . . Second groove

323. . . First feed port

324. . . Second feed port

330. . . First cavity

331. . . First top block

340. . . Second cavity

341. . . Second top block

Figure 1 is a lens of an embodiment of the present invention.
Fig. 2 is a flow chart showing a method of manufacturing a lens group according to an embodiment of the present invention.
3 to 7 are schematic views showing the intra-membrane injection manufacturing of the lens group according to an embodiment of the present invention.
8 to 14 are schematic views showing the manufacturing of a two-shot injection of a lens group according to an embodiment of the present invention.
15 to 16 are schematic views showing the assembly of a lens according to an embodiment of the present invention.

Hereinafter, the embodiments of the lens group and the method of manufacturing the same according to the present invention will be described with reference to the related drawings. For the sake of understanding, the same or similar elements in the following embodiments are denoted by the same reference numerals.

It is to be noted that, in the present specification, the size and thickness of the constituent members are arbitrarily illustrated for further understanding and simplicity of the description, and the present invention is not limited to the illustrated dimensions and thicknesses.

Please refer to Fig. 1, which is a lens according to an embodiment of the present invention. Among them, the lens of the present invention is used for optical imaging, and can be applied to a mobile phone lens or a computer camera lens.

As shown, the lens 99 includes a lens barrel 110 and a lens group 120. The lens group 120 of the present embodiment is exemplified by a four-piece imaging lens group, but is not limited thereto. In other embodiments of the invention, lens group 120 can be a six-piece or seven-piece imaging lens set.

The lens group 120 includes a first imaging lens 121, a second imaging lens 122, a third imaging lens 123, and a fourth imaging lens 124. It is to be noted that the present embodiment is for improving the assembly error between the first imaging lens 121, the second imaging lens 122, the third imaging lens 123, and the fourth imaging lens 124 in the first imaging lens group 121 and the second imaging. The first coupling lens 131 is further included between the lens groups 122, and the second coupling lens 132 is further included between the third imaging lens group 123 and the fourth imaging lens group 124.

More specifically, the first coupling lens 131 connects the first imaging lens group 121 and the second imaging lens 122, and the second coupling lens 132 connects the third imaging lens 123 and the fourth imaging lens 124. In this way, since the first connecting lens 131 and the second connecting lens 132 respectively connect adjacent imaging lenses, the first imaging lens 121, the second imaging lens 122, the third imaging lens 123, and the fourth imaging lens 124 can be improved. Assembly errors such as displacement or skew.

In addition, the lens unit 110 further includes a sensing unit 101 for sensing the light received by the lens group 120 and forming an image signal for transmission to a processing unit (not shown) of the mobile phone. The sensing unit 101 can be a charge. Coupling components, but not limited to them.

For ease of understanding, how to make a lens group that can improve assembly errors will be described below. The first imaging lens 121, the second imaging lens 122, and the first coupling lens 131 connecting the first imaging lens 121 and the second imaging lens 122 in the lens group of FIG. 1 are taken as an example. It is to be noted that the first imaging lens 121 and the second imaging lens 122 of the present embodiment are manufactured by injection molding.

Please refer to FIG. 2, which is a flow chart of a method of manufacturing a lens group according to an embodiment of the present invention. As shown in the figure, first, in step S11, the first injection molding lens, the second injection molding lens, and the coupling lens that connects the first injection molding lens and the second injection molding lens are determined in the lens group. Next, in step S12, the first injection molding lens and the second injection molding lens are simultaneously formed on both side faces of the coupling lens by the injection process. The first injection molding lens may be the first imaging lens 121 in FIG. 1 , and the second injection molding lens may be the second imaging lens 122 in FIG. 1 , but not limited thereto. In other embodiments of the invention, the first injection molded lens and the second injection molded lens may be other imaging lenses in the lens group 120 of FIG.

The injection process can include an in-film injection process or a dual injection process. Please refer to FIG. 1 and FIG. 3 to FIG. 7 together. FIGS. 3 to 7 are schematic views showing the intra-membrane injection manufacturing of the lens group according to an embodiment of the present invention. In this embodiment, the first imaging lens 121 and the second imaging lens 122 of FIG. 1 are taken as an example. First, the first injection molding lens 121a is determined to be the first imaging lens 121, and the second injection molding lens 121b is the second imaging lens. 122 and a first coupling lens 131a that connects the first injection molding lens 121a and the second injection molding lens 121b.

In the third embodiment, the first injection molding lens 121a includes a first surface 121b and a second surface 121c that face each other, and the second injection molding lens 122a includes a third surface 122b and a fourth surface 122c that face each other. In this embodiment, the first connecting lens 131a can completely connect the second surface 121c and the third surface 122b by the injection process.

Next, please refer to FIG. 4 to provide a mold 200. The mold 200 has a cavity 210 that is contoured relative to the first face 121b and the fourth face 122c. In more detail, the shape of the first side wall 201 of the cavity 210 is opposite to the first surface 121b of the first injection molding lens 121a, and the shape of the second side wall 202 is opposite to the fourth surface 122c of the second injection molding lens 122. That is, the first surface 121b of the embodiment is a convex surface, and the first side wall 201 is a concave surface. Similarly, because the fourth surface 122c is a convex surface, the second sidewall 202 of the first sidewall 201 is concave, but not limited thereto. In other embodiments of the present invention, if the first injection molding lens 121a is the third imaging lens 123 in FIG. 1 and the second injection molding lens 122a is the fourth imaging lens 124 in FIG. 1, the cavity 210 The first sidewall 201 and the second sidewall 202 may be outwardly shaped with respect to the third imaging lens 123 and the fourth imaging lens 124, respectively, and have an aspherical shape.

Next, as shown in Fig. 5, the first coupling lens 131a is placed in the cavity 210, and the mold clamping operation is performed. The first connecting lens 131a of the present embodiment can be formed by means other than the injection process, for example, mechanical grinding, but not limited thereto.

Next, as shown in FIG. 6, the transparent material 220 is ejected into the cavity 210. The transparent material 220 is an optical grade transparent plastic, and the plastic melting temperature thereof is preferably larger than the first connecting lens 131a to prevent the transparent material 220 from causing damage to the surface of the first connecting lens 131a during the shooting process.

Next, as shown in FIG. 7, the first injection molding lens 121a and the second injection molding lens 122a are formed on both sides of the first coupling lens 131a by performing the mold opening operation.

In addition to the in-mold ejection process, an embodiment of the present invention can further produce the lens group of Fig. 1 by the technique of a two-shot injection process. Please refer to FIG. 1 and FIG. 3 and FIG. 8 to FIG. 14 together. FIG. 8 to FIG. 14 are schematic views showing the manufacturing of the two-shot injection of the lens group according to an embodiment of the present invention. This embodiment is exemplified by the manufacture of the first imaging lens 121 and the second imaging lens 122 in FIG. First, it is determined that the first injection molding lens 121a is the first imaging lens 121, the second injection molding lens 121b is the second imaging lens 122, and the first coupling lens 131a that connects the first injection molding lens 121a and the second injection molding lens 121b. , but not limited to this. In other embodiments of the invention, the first injection molded lens and the second injection molded lens may be other imaging lenses in the lens group 120 of FIG.

Next, please refer to FIG. 8 to provide a mold 300. The mold 300 includes a male mold 310, a female mold 320, a first mold cavity 330, and a second mold cavity 340. One side of the female die 320 has a first groove 321 and a second groove 322. The first groove 321 has one side wall of the same outer shape as the second surface 121c of the first injection molding lens 121a, and the other side wall of the same outer shape as the third surface 122b of the second injection molding lens 122a. The second groove 322 has one side wall opposite to the first face 121b of the first injection molded lens 121a and the other side wall opposite to the outer shape of the fourth face 122c of the second injection molded lens 122b.

In more detail, the second surface 121c is substantially a plane, and the third surface 122b is substantially a concave surface. The first groove 321 has a substantially flat sidewall surface and a substantially concave surface opposite to the other sidewall surface. The first surface 121b and the fourth surface 122c are substantially convex side wall surfaces, and the opposite side walls of the second recess 322 are substantially concave. However, the present invention is not limited thereto. In other embodiments, the first injection molding lens and the second injection molding lens are other imaging lenses in the lens group 120 of FIG. 1, the first groove 321 and The second groove 322 may have a side wall surface opposite to the aspherical surface.

One side of the male mold 310 has a first top abutting block 331 opposite to the first recess 321 and a second top abutting block 341 opposite the second recess 322. In more detail, as shown in FIG. 9, after the male mold 310 is clamped with the female mold 320, the first recess 321 and the first top resisting block 331 surround the first cavity 330, and the second recess 322 is The second abutting block 341 surrounds the second cavity 340. At this time, the first cavity 330 has two side wall surfaces having the same outer shape as the second surface 121c of the first injection molding lens 121a and the third surface 122b of the second injection molding lens 122a. The second cavity 340 has two side wall faces that are opposite to the first face 121b of the first injection molded lens 121a and the fourth face 122c of the second injection molded lens 122a.

Next, as shown in Figure 10. The first transparent material 221 is ejected into the first cavity 330 by the first inlet 323 on the master 320. The first inlet 323 is an optical grade transparent plastic material.

Next, as shown in Figure 11. The operation of opening the mold and the separation of the male mold 310 and the female mold 320 complete the production of the first connecting lens 131a. At this time, the first coupling lens 131a is still mounted on the first abutting block 331. It should be noted that, in order to smoothly demold the first connecting lens 131a, the mother die 320 may further include a plurality of sliders 400, 401, and 402, which are installed at appropriate positions, when performing the mold opening action. The slider 402 can be slid to the position of the broken line in the figure in advance to facilitate the opening operation.

Next, as shown in Figure 12. Rotating the male mold 310, the first coupling lens 131a embedded in the first abutting block 331 is moved to the position corresponding to the second recess 322 by the rotation of the male mold 310, and at the same time, the slider 400 can be slid to its original state. s position.

Next, as shown in Figure 13. The mold clamping is performed again, and the two materials are injected. That is, the second transparent plastic material 222 is ejected from the second feed port 324 of the female die 320 to the second cavity 340, and the first transparent material 221 is also ejected from the first feed port 323 to the first die. In the hole 330. The melting temperature of the second transparent material 222 in the embodiment is preferably smaller than that of the first transparent material 221, so as to avoid damaging the first connecting lens 131a formed by the first transparent material 221 when the second transparent material is emitted. The surface.

In this manner, the first injection molding lens 121a and the second injection molding lens 122a can be closely coupled to the opposite side faces of the first coupling lens 131a by the technique of two-shot injection.

Next, as shown in Figure 14. The mold is opened again. At this time, the first coupling lens 131a, the first injection molding lens 121a, and the second injection molding lens 122a which are embedded in the first abutting block 331 can protrude from the top of the first abutting block 331. A ejector pin (not shown) causes the lens group having the first coupling lens 131a, the first injection molding lens 121a, and the second injection molding lens 122a to come out. Among them, the technique of detaching the finished product by the thimble is a technique well known in the art, and will not be described here. Here, in order to smoothly demold the lens groups of the first coupling lens 131a, the first injection molding lens 121a, and the second injection molding lens 122a, the mother die 320 may further include a plurality of sliders 400, 401 and 402, installed in an appropriate position, when performing the mold opening action, the sliders 402, 401 and 402 can be slid to the position of the broken line in the figure in advance to facilitate the opening operation.

Then, the male mold 310 is rotated again to return to the step of Fig. 12, and the double material ejection can be repeated. With the reciprocating operation between the male die 310 and the master die 320, a large number of the first connecting lens 131a and the first injection molding lens 121a and the second injection molding lens 122a connecting the first coupling lens 131a can be quickly manufactured. Lens group. In addition to this, the first injection molding lens 121a and the second injection molding lens 122a can be more firmly joined to the first coupling lens 131a by the two-shot technique.

Next, please refer to FIG. 15 to FIG. 16 , which are schematic diagrams showing the assembly of the lens according to an embodiment of the present invention. As shown, the lens 99 includes a lens barrel 110 and a first lens group 199 and a second lens group 198. A lens housing groove 111 is included in the lens barrel 110. The first lens group 199 and the second lens group 198 are lens groups formed by the above-described two-material injection or in-mold emission. That is, the first imaging lens 121 in the present embodiment may be the first injection molding lens 121a described above, and the second imaging lens 122 may be the second injection molding lens 122a described above.

In more detail, the first connecting lens 131 of the first lens group 199 has a first surface 131b and a second surface 131c opposite thereto, the first surface 131b is coupled to one side of the first imaging lens 121, and the second surface 131c is coupled to the second surface. One side of the imaging lens 122. Similarly, the second connecting lens 132 of the second lens group 198 has a first surface 132b opposite to the second surface 132c. The first surface 132b is coupled to one side of the third imaging lens 123, and the second surface 132c is coupled to the fourth imaging lens. One side of 124.

In addition, since the first lens group 199 and the second lens group 198 are formed by a two-material injection process or an in-mold emission process, the first surface 131b of the first coupling lens 131 is formed outside the first imaging lens 121. The outer shapes correspond to each other to face the first side 131b and the side surface of the first imaging lens 121 face to face. The second surface 131c of the first coupling lens 131 and the side surface of the second imaging lens 122 are mutually corresponding to each other to face the surface and the side surfaces of the second surface 131c and the second imaging lens 122. Similarly, the outer surface of the first surface 132b of the second coupling lens 132 of the second lens group 198 and the side surface of the third imaging lens 123 correspond to each other to face the first surface 132b and the third imaging lens 123. side. The second surface 132c of the second coupling lens 132 corresponds to the side surface of the fourth imaging lens 124 to face the surface and the side surfaces of the second surface 132c and the fourth imaging lens 124.

One end surface of the first lens group 199 of the present embodiment is smaller than the opposite end surface of the first lens group 199, that is, the outer surface of the first imaging lens 121 is smaller than the outer surface of the second imaging lens 122. In more detail, the side wall surface of the first lens group 199 is a stepped outer shape. The inner wall of the lens receiving groove 111 corresponds to the side wall surface of the first lens group 199, so that the first lens group 199 can be engaged with the first position 112 of the lens receiving groove 111.

Similarly, the end surface of the second lens group 198 is smaller than the opposite end surface of the second lens group 198, that is, the outer surface of the third imaging lens 123 is smaller than the outer surface of the fourth imaging lens 124. In more detail, the side wall surface of the second lens group 198 is a stepped outer shape. The inner wall of the lens receiving groove 111 corresponds to the side wall surface of the second lens group 198, so that the second lens group 198 can be engaged with the second position 114 of the lens receiving groove 111.

In this way, each of the imaging lenses in the first lens group 199 and the second lens group 198 of the present embodiment can be fixed at their relative positions by a coupling lens by a two-material injection or in-mold ejection process. Then, the modularized first lens group 199 and the second lens group 198 are placed in the lens receiving groove 111 in the lens barrel 110, so that the imaging lenses need to be separately placed into the lens barrel in the prior art. Internal, resulting in assembly errors such as displacement or tilt.

By modularizing the lens group, the assembly error of the imaging lens in the lens can be reduced, thereby improving the yield and optical quality of the assembly. For example, taking the above four imaging lenses as an example, since the modular lens group can be directly assembled, it is equivalent to installing only two sets of lens groups, which can greatly reduce assembly errors, thereby improving the lens of the present invention. Resolution.

In addition, the connection lens between the respective imaging lenses can be adjusted or further adapted to the optical relationship between the imaging lenses and the other imaging lenses. For example, in addition to reducing the assembly error, in some embodiments of the present invention, the connecting lens can further affect the control variables of the light passing through the lens group, such as changing the bending force or changing the angle at which the light is incident on the photosensitive element. Further, the focal length of the lens group of the present invention is adjusted so that the lens for mounting the lens group can be further reduced.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

S11~S12. . . Step method

Claims (10)

A method of manufacturing a lens group, comprising: determining one of a first injection molding lens, a second injection molding lens, and a coupling lens connecting one of the first injection molding lens and the second injection molding lens; The first injection molding lens and the second injection molding lens are formed on both sides of the coupling lens by an injection process. The manufacturing method according to claim 1, wherein the first injection molding lens comprises a first surface and a second surface opposite to each other, and the second injection molding lens comprises a third and a third opposite to each other. And the fourth surface, the connecting lens is coupled to the second surface and the third surface, the shooting process further comprises: providing a mold, the mold having a first shape opposite to the first surface and the fourth surface Forming the connecting lens in the first cavity; and emitting a first transparent material in the first cavity to form the first injection molding lens and the second injection molding lens in the coupling lens Both sides. The manufacturing method of claim 2, wherein before the step of disposing the connecting lens in the first cavity, the method further comprises: providing the mold, the mold further comprising the second surface and the third surface a second cavity of the same shape; a second transparent material is injected into the second cavity to form the coupling lens; and the coupling lens is moved into the first cavity. The manufacturing method of claim 3, wherein the mold comprises a male mold and a female mold, the female mold comprising the first mold cavity and the second mold cavity, when the second transparent material is injected In the second cavity, the second transparent material is simultaneously formed on the male mold, wherein the step of moving the connecting lens into the first cavity further comprises: rotating the male mold to make the connecting lens Enter the first cavity. The manufacturing method of claim 3, wherein the first transparent material has a melting temperature lower than the second transparent material. A lens comprising: a lens barrel, the lens barrel includes a lens receiving groove; and a lens group mounted on the lens receiving groove, the lens group comprising: a first injection molding lens; and a second injection molding a lens; and a connecting lens having a first surface opposite to a first surface, the first surface is coupled to one side of the first injection molding lens, and the second surface is coupled to one of the second injection molding lenses side. The lens of claim 6, wherein the first surface outer shape and the side surface of the first injection molding lens correspond to each other to face the first surface and the first injection molding lens. The side surface of the second surface is in contact with the side surface of the second injection molding lens to face the second surface and the side surface of the second injection molding lens. The lens of claim 6, wherein the lens group is formed by a two-shot ejection process, wherein the first injection molding lens and the second injection molding lens are formed by a first transparent material, the connection The lens is formed from a second transparent material. The lens of claim 8, wherein the first transparent material has a melting temperature less than the second transparent material. The lens of claim 6, wherein the lens group is formed by an insert molding process.