TWI416194B - Optical lens group - Google Patents

Abstract

An optical lens group includes a first lens and a second lens. The first lens and the second lens both include an optical part in the center of the lens and a non-optical part in the periphery of the lens. The non-optical part of the first lens includes a protruding stage. The non-optical part of the second lens includes a protruding platform engaging with the protruding stage of the first lens to receive the protruding stage and to fix to it, so to make the first lens and the second lens fixing with each other. The non-optical part of the first lens further includes a sub-protruding stage that locating in the top end of the protruding stage closing to the second lens. The outer surface of the sub-protruding stage has space with the protruding platform of the second lens.

Description

Optical lens set

The invention relates to an optical lens set, in particular to an optical lens set used in a lens module of an electronic product such as a mobile phone and a digital camera.

In recent years, with the development of multimedia technology, the application range of lens modules has become wider and wider, such as in electronic products such as digital cameras, video cameras, and mobile phones with camera functions.

While people are pursuing miniaturization of digital cameras, camcorders, and mobile phones with camera functions, there is a higher demand for the image quality of the objects they shoot, that is, the image of the subject is desired to be clear. The image quality of an object depends to a large extent on whether the optical axes of the lenses in the lens module are aligned during assembly. Alpheus W. Burner et al., Paper Lens Calibration For Wind Tunnel Measurements, published in the 1995 SPIE System, Videometrics IV, revealed that the optical axes of the lenses in the lens module are not The effect of alignment.

As shown in FIG. 3, a lens assembly method commonly used in the prior art is such that the periphery of the first lens 24 is disposed to have a protruding step 242, and the periphery of the second lens 26 is disposed to have a first lens 24 The step 242 is matched with the boss 262, and the contact faces of the step 242 and the boss 262 are both provided with inclined faces having the same inclination angle. When assembled, The step 242 of the first lens 24 and the entire bevel of the boss 262 of the second lens 26 are in contact with each other to ensure that the first lens 24 and the second lens 26 are fixed and not eccentric. However, this arrangement imposes strict requirements on the manufacturing tolerances of the inclined surfaces of the stage 242 and the boss 262, and there is a stress between the inclined surfaces, and the presence of stress may cause the second lens 26 to be deformed. Since the pushing force of the entire inclined surface increases with the increase of the contact area, the abutting of the entire inclined surface inevitably causes excessive stress to increase the deformation of the second lens 26, thereby affecting the imaging quality of the assembled lens module.

Therefore, it is necessary to provide an optical lens group for use in a lens module of an electronic product such as a mobile phone and a digital camera, which can improve the optical axis concentricity of each lens in the optical lens group and has less stress between the lenses, and the lens is not easily deformed.

An optical lens set comprising a first lens and a second lens, the first lens and the second lens each comprising an optical portion at a center of the lens and a non-optical portion at a periphery of the lens center, the first lens The non-optical portion has a protruding step, and the non-optical portion of the second lens has a boss that cooperates with the step of the first lens to receive the step and to secure the second lens with the first lens The lens is fixed, the first lens non-optical portion further has a sub-stage, the step is located near the top end of the second lens, and the step and the sub-stage are annular circles surrounding the optical portion of the first lens The outer diameter of the stage is greater than the outer diameter of the sub-stage, the outer surface of the stage is in contact with the inner surface of the boss, and there is a gap between the outer surface of the sub-stage and the inner surface of the boss .

Compared with the prior art, in the optical lens set of the present invention, the non-optical portion of the first lens has a sub-stage, and the stage is located near the top end of the second lens, and the sub-stage is external. There is a gap between the face and the boss of the second lens, so that the stress between the lenses can be reduced, thereby reducing the degree of deformation of the lens and the probability of deformation, so that the second lens is easier to assemble when assembled to the first lens.

10‧‧‧Optical lens group

24, 14‧‧‧ first lens

26, 16‧‧‧ second lens

242, 142‧‧ ‧

262, 162‧‧ ‧ boss

144‧‧‧Substage

148, 146‧‧‧ outer surface

166‧‧‧Stud bevel

18‧‧‧ spacer ring

1 is a cross-sectional view of an optical lens set provided by an embodiment of the present invention.

Figure 2 is a partial enlarged view of the optical lens set of Figure 1.

Figure 3 is a cross-sectional view of an optical lens set of the prior art.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is an optical lens set 10 according to an embodiment of the invention, which includes a first lens 14 and a second lens 16 .

The first lens 14 includes an optic portion at the center of the lens and a non-optical portion at the periphery of the lens for securing the lens. The optics are used to achieve a certain optical effect during the imaging process, while the non-optical portion is only used to fix the lens and does not participate in imaging. The periphery of the first lens 14 is provided with a protruding step 142. The stage 142 is annularly distributed around the center of the lens of the first lens 14.

Similarly, the second lens 16 also includes an optic portion at the center of the lens and a non-optical portion at the periphery of the lens for securing the lens. The periphery of the second lens 16 is provided with a boss 162 that cooperates with the step 142 of the first lens 14. The boss 162 of the second lens 16 is annularly distributed around the center of the lens of the second lens 16.

The contact faces of the step 142 and the boss 162 are each provided as a slope having the same inclination. Moreover, the slope of the step 142 and the slope of the boss 162 are engaged with each other to make the second mirror The sheet 16 is fixed to the first lens 14.

Further, the non-optical portion of the first lens 14 is provided with a sub-stage 144. The sub-stage 144 is located at the top of the stage 142 near the second lens 16. There is a gap between the outer surface 148 of the sub-stage 144 and the boss 162 of the second lens 16, i.e., the outer surface 148 of the sub-stage 144 does not contact the boss slope 166.

The boss slope 166 of the boss 162 of the second lens 16 is the same as the angle of the outer surface 146 of the step 142 of the first lens 14. When assembled, the outer surface 146 of the step 142 mates with the boss ramp 166 of the second lens 16.

There is a gap between the outer surface 148 of the sub-stage 144 of the first lens 14 and the land slope 166 of the second lens 16.

Further, a spacer ring 18 may be disposed between the first lens 14 and the second lens 16 to ensure a fixed spacing between the lenses.

In the optical lens assembly 10 provided by the present invention, since the outer surface 146 of the step 142 of the first lens 14 is in mating contact with the boss slope 166, the step 142 and the boss 162 can be fixed to each other to make the second lens 16 It is fixed to the first lens 14. The outer surface 148 of the sub-stage 144 is disposed in the gap between the outer surface 148 and the boss 162. Thus, the second lens 16 can be assembled more easily when assembled on the first lens 14, and the lens is replaced by the same tolerance dimension. The resulting stress problem, thereby reducing the degree of deformation and deformation of the lens, makes it easier to assemble the second lens 16 onto the first lens 14.

In the optical lens set 10 of the present invention, the material of the first lens 14 and the second lens 16 may be plastic or glass, which may be produced by injection molding, or may be made by precision grinding or molding.

Compared with the prior art, in the optical lens set of the present invention, the non-optical portion of the first lens has a sub-stage, and the step is located near the top end of the second lens, and the outer surface of the sub-stage and the second lens There is a gap between the bosses, so that the stress between the lenses can be reduced, thereby reducing the degree of deformation of the lens and the probability of deformation, so that the second lens is easier to assemble when assembled to the first lens.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧Optical lens group

14‧‧‧ first lens

16‧‧‧second lens

142‧‧‧

162‧‧‧Boss

166‧‧‧Stud bevel

18‧‧‧ spacer ring

Claims (5)

An optical lens set comprising a first lens and a second lens, the first lens and the second lens each comprising an optical portion at a center of the lens and a non-optical portion at a periphery of the lens center, the first lens The non-optical portion has a protruding step, and the non-optical portion of the second lens has a boss that cooperates with the step of the first lens to receive the step and to secure the second lens with the first lens The lens is fixed, the improvement is that the first lens non-optical portion further has a sub-stage, the step is located near the top end of the second lens, and the step and the sub-stage are both optical portions surrounding the first lens An annular circular table having an outer diameter larger than an outer diameter of the sub-stage, the outer surface of the stage being in contact with the inner surface of the boss, the outer surface of the sub-stage and the inner surface of the boss There is a gap between them. The optical lens set according to claim 1, wherein the step of the first lens is annularly distributed around the center of the lens of the first lens. The optical lens set according to claim 1, wherein the projection of the second lens is annularly distributed around the center of the lens of the second lens. The optical lens assembly of claim 1, wherein a spacer ring is further disposed between the first lens and the second lens for fixing the spacing between the two lenses. The optical lens set according to claim 1, wherein the material of the first lens and the second lens is glass or plastic.