TWI471627B - Lens module and method for assembly same - Google Patents

Description

Lens module and assembly method thereof

The invention relates to a lens module and an assembly method thereof.

Compared to general optical instruments, camera lenses are more complex and often consist of a considerable number of lenses. In the optical design, the relative positions of these lenses are designed as completely ideal, that is, the image quality at the time of design is completed under the ideal condition that the optical axes of each lens completely coincide, each lens There is no concentricity error, and the accuracy error of the lens barrel in the mechanical manufacturing process is also neglected. It is considered that the relative position of each lens in the lens barrel is absolutely accurate.

However, in view of the limitation of the mechanical manufacturing process, each lens is loaded into the lens barrel with different degrees of inclination or deviation of the optical axis, thereby generating a concentricity error, which inevitably affects the imaging quality of the assembled lens. Moreover, due to the limitation of the manufacturing precision of the lens barrel, there is also a certain error in the mutual spacing of the lenses in the vertical direction.

At present, in order to ensure that the lenses and the lens barrels have good concentricity after assembly, the lenses are usually placed directly in the lens barrel, and each lens and the lens barrel are connected to a special assembly lathe through a centering instrument. Quasi-fixed to ensure the concentricity requirements of each lens. However, in the above method, a special assembly lathe is required, which is costly and difficult to operate, and this method cannot correct the error of the relative spacing between the lenses. When the lens module is assembled, even if a defective product appears during the test, it cannot be reworked and can only be scrapped.

In view of the above, it is necessary to provide a lens module which is simple in structure and capable of finely adjusting the concentricity and relative spacing of the lens group after assembly, and a method of assembling the lens module.

A lens module includes: a first lens barrel having a through hole, the inner wall of the through hole is provided with an annular level protrusion along a circumferential direction thereof, and the annular level protrusion is divided into the through hole a through hole and a second through hole, the annular level protrusion having a first bearing surface, the first bearing surface being composed of a plurality of identical regions continuously distributed in the circumferential direction and a smooth transition between adjacent regions Each of the regions is composed of a convex plane higher than the first bearing surface, a concave plane lower than the first bearing surface, and a plane coincident with the first bearing surface, and a smooth transition between the surfaces; at least one first a second lens barrel having a body portion, a first end surface, and a second end surface, wherein the third through hole penetrates the body portion, the first end surface, and the second surface toward the object side An end surface, the second lens barrel is embedded in the first through hole of the first lens barrel, and at least one groove or rib is disposed in the second end surface of the second lens barrel, and the groove or the rib is used for the groove Cooperating with a fixture to rotate the second lens barrel relative to the first lens barrel; a non-optical portion of the second lens having a second mating surface, the second lens being fixed in the third through hole of the second lens barrel, the second mating surface and the ring in the first lens barrel The shape-level projections are opposed to each other, and a plurality of bosses are disposed in the second mating face of the second lens, the positions of which correspond to the same planes in the region composed of the convex plane, the concave plane and the plane, respectively.

And the assembling method of the lens module, the method comprising: assembling the at least one second lens into the third through hole in the second lens barrel, and dispensing and fixing the at least one first lens; The second through hole of the first lens barrel is fixed by dispensing; it will be assembled The second lens barrel is assembled into the first through hole of the first lens barrel, and the protrusion is supported on the annular level protrusion; the lens module is tested, if the test does not meet the requirements, Then, using a jig to rotate the second lens barrel through the groove or the rib to perform fine adjustment until the test result of the lens module meets the requirements.

Compared with the prior art, the lens module of the present invention fixes the first lens and the second lens in the first lens barrel and the second lens barrel respectively, and the second lens barrel is embedded in the first lens barrel. a plurality of grooves are disposed in an end surface of the second lens barrel, and the plurality of grooves are used to pass the second lens barrel to rotate the second lens relative to the first lens barrel, and at the same time, a plurality of bosses are disposed in the mating surface of the second lens that cooperates with the first lens barrel, and the bearing surface of the first lens barrel for carrying the second lens is disposed in a convex-concave plane to cooperate with the boss And the boss can slide in the plane of the convex and concave. Through this structure, the concentricity of the lens group in the lens module can be finely adjusted and the relative spacing between the lenses can be finely adjusted, so that the lens module can be unqualified during assembly or after assembly. The lens module is fine-tuned to increase the yield of the product.

1‧‧‧ lens module

10‧‧‧ first lens barrel

20‧‧‧second lens barrel

14‧‧‧ first lens

30‧‧‧second lens

11‧‧‧through hole

12‧‧‧ bumps

110‧‧‧ first through hole

111‧‧‧Second through hole

121‧‧‧First bearing surface

1210‧‧‧Area

1211‧‧‧ concave plane

1212‧‧‧ convex plane

1213‧‧‧ plane

21‧‧‧ Body Department

22‧‧‧ first end face

23‧‧‧second end face

24‧‧‧ third through hole

25‧‧‧ Groove

31‧‧‧Second mating surface

32‧‧‧Boss

1 is a perspective view of a lens module provided by the present invention.

2 is a perspective exploded view of a lens module provided by the present invention.

3 is a partial enlarged view of the lens module shown in FIG. 2.

4 is a cross-sectional view of the lens module of the present invention taken along line IV-IV of FIG. 1.

The invention will now be described in further detail with reference to the accompanying drawings.

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the lens module 1 of the present invention includes a first lens barrel 10 , a second lens barrel 20 , a first lens 14 , and a second lens 30 .

The first lens barrel 10 has a through hole 11 therein, and an annular horizontal level protrusion 12 is disposed along the circumferential direction of the inner wall of the through hole 11, and the protrusion 12 divides the through hole 11 into a first through hole. 110 and a second through hole 111 having a first bearing surface 121, the first bearing surface 121 being composed of a plurality of identical regions 1210 continuously distributed along the circumferential direction thereof, and smoothing between adjacent regions transition.

The region 1210 is composed of a concave plane 1211 that is lower than the first bearing surface 121, a convex plane 1212 that is higher than the first bearing surface 121, and a plane 1213 that coincides with the first bearing surface 121. The three types of surface edges The circumferential direction is continuously distributed, and a smooth transition between the faces is achieved. In the three types of planes, based on the plane 1213, the height difference between the other two types of planes and the plane 1213 can be set according to different design requirements, but the optimum range should be [-0.01mm, +0.01 Mm].

In the present invention, the widths of the concave plane 1211, the convex plane 1212, and the plane 1213 may be designed to be equal width or may be designed to be unequal width. In the present embodiment, the height of the concave plane 1211 is set to -0.01 mm, and the height of the convex plane 1212 is set to 0.01 mm. The first bearing surface 121 is composed of four identical regions 1210 composed of the concave plane 1211, the convex plane 1212 and the plane 1213.

The first lens 14 is fixed in the second through hole 111. In the embodiment, the number of the first lenses 14 is three. Of course, the number of the first lenses 14 may be any integer greater than or equal to 1.

The second barrel 20 is embedded in the first through hole 110 of the first barrel 10 . The second lens barrel 20 has a body portion 21, a first end surface 22 and a second end surface 23, and a third through hole 24 The body portion 21, the first end surface 22, and the second end surface 23 are worn.

The first end surface 22 of the second lens barrel 20 is opposite to the first bearing surface 121 of the protrusion 12, and the second end surface 23 of the second barrel 20 is provided with at least one groove 25 for the groove 25 The second lens barrel 20 is rotated relative to the first lens barrel 10 in cooperation with a jig. In this embodiment, the number of the grooves 25 is six. Of course, in the present invention, the groove 25 can also be designed as a rib.

The second lens 30 is fixed in the third through hole 24 of the second lens barrel 20. The non-optical portion of the second lens 30 has a second mating surface 31 opposite to the annular level protrusion 12 in the first barrel 10. A plurality of bosses 32 are disposed in the second mating face 31, the positions of which correspond to the same planes in the region 1210 of the plurality of concave planes 1211, convex planes 1212 and planes 1213, respectively. In the present embodiment, the number of the bosses 32 is four, which are evenly distributed in the second mating face 31 and respectively in the region 1210 composed of the concave plane 1211, the convex plane 1212 and the plane 1213. Corresponding to the same plane. It can be understood that the number of the bosses 32 can also be smaller than the number of the regions 1210 composed of the concave plane 1211, the convex plane 1212, and the plane 1213.

The method for assembling the lens module 1 provided by the present invention comprises the following steps:

(1) The second lens 30 is assembled into the third through hole 24 of the second lens barrel 20 such that the second mating surface 31 of the second lens 30 is located at the first end surface 22 of the second lens barrel 20. The same side of the second barrel 20 is fixed by dispensing.

(2) The first lens 14 is assembled into the second through hole 111 of the first barrel 10, and is fixed by dispensing.

(3) The second lens barrel 20 in which the second lens 30 is assembled is placed in the first through hole 110 of the first lens barrel 10, and the boss 32 in the second mating surface 31 of the second lens 30 is made. Undertake The first bearing surface 121 of the annular level protrusion 12 is placed on the first bearing surface 121, and the bosses 32 are respectively engaged with the plane 1213 of the first bearing surface 121 that does not belong to the same area.

(4) The lens module 1 is tested. If the test does not meet the requirements, the second lens barrel 20 is rotated through the groove or the rib 25 by a jig (for example, a thin rod) to make the protrusion 32. Cooperate with the convex surface or the concave surface until the test result of the lens module 1 meets the requirements.

After the lens module 1 passes the test, the second lens barrel 20 assembled with the second lens 30 at this time is glued and fixed in the first through hole 110 of the first lens barrel 10 to prevent mutual contact with each other. slide.

The test machine that tests the lens module 1 may be an MTF (Modulation Transfer Function) tester.

According to the lens module 1 of the present invention, the second lens 30 fixed in the second lens barrel can be moved in the axial direction and the radial direction relative to the lens group fixed in the first lens barrel 10, through which A structure can finely adjust the concentricity of the lens group in the lens module and finely adjust the relative spacing between the lenses. Therefore, during the assembly of the lens module or after the assembly is completed, the unqualified lens module can be fine-tuned to increase the yield of the product.

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‧‧‧ first lens barrel

20‧‧‧second lens barrel

30‧‧‧second lens

11‧‧‧through hole

12‧‧‧ bumps

1210‧‧‧Area

1211‧‧‧ concave plane

1212‧‧‧ convex plane

1213‧‧‧ plane

21‧‧‧ Body Department

22‧‧‧ first end face

23‧‧‧second end face

24‧‧‧ third through hole

25‧‧‧ Groove

31‧‧‧Second mating surface

32‧‧‧Boss

Claims (10)

A lens module includes: a first lens barrel having a through hole, the inner wall of the through hole is provided with an annular level protrusion along a circumferential direction thereof, and the annular level protrusion defines the through hole a first through hole and a second through hole, the annular level protrusion having a first bearing surface, the first bearing surface being composed of a plurality of identical regions continuously distributed in the circumferential direction and a smooth transition between adjacent regions Each of the regions is composed of a convex plane higher than the first bearing surface, a concave plane lower than the first bearing surface, and a plane coincident with the first bearing surface, and a smooth transition between the surfaces; at least one a lens that is fixed in the second through hole of the first lens barrel; a second lens barrel having a body portion, a first end surface and a second end surface, a third through hole penetrating the body portion, the first end surface, and a second end surface facing the object side, the second lens barrel is embedded in the first through hole of the first lens barrel, and at least one groove or rib is disposed in the second end surface of the second lens barrel; a second lens, the non-optical portion of the second lens has a second mating surface, the second The piece is fixed in the third through hole of the second lens barrel, the second mating surface is opposite to the annular level protrusion in the first barrel, and a plurality of second mating surfaces of the second lens are disposed a boss having a position corresponding to the same plane in the region consisting of a convex plane, a concave plane, and a plane, the groove or the rib being used to fit a jig to make the second barrel relative to the first The lens barrel is rotated such that the plurality of bosses slide in the convex plane, the concave plane and the plane to finely adjust the distance between the first lens and the second lens. The lens module of claim 1, wherein the convex plane, the concave plane, and the plane have the same width in the circumferential direction. The lens module of claim 1, wherein: the convex plane, the concave plane, and the flat The faces have different widths in the circumferential direction. The lens module of claim 2, wherein the width of the boss in the circumferential direction is smaller than the width of the convex plane, the concave plane, and the plane in the circumferential direction. The lens module of claim 4, wherein the number of the bosses is equal to the number of regions consisting of a convex plane, a concave plane, and a plane. The lens module of claim 4, wherein the number of the bosses is smaller than the number of regions consisting of a convex plane, a concave plane, and a plane. The lens module of claim 5, wherein the convex plane, the concave plane, and the plane are based on the plane, and the height range of the convex plane and the concave plane relative to the plane is [- 0.01mm, +0.01mm]. A method for assembling a lens module according to claim 1, wherein the step of assembling the at least one second lens into the third through hole in the second lens barrel and fixing the glue; The at least one first lens is assembled into the second through hole of the first lens barrel and is fixed by dispensing; the second lens barrel assembled with the second lens is assembled into the first through hole of the first lens barrel, and Supporting the boss against the annular level protrusion; testing the lens module, if the test does not meet the requirements, using a jig to rotate the second barrel through the groove or the rib to fine-tune Until the test results of the lens module meet the requirements. The method of assembling a lens module according to claim 8, wherein the lens module is tested using a modulation transfer function tester. The method for assembling a lens module according to claim 8, wherein: after the lens module passes the test, the second lens barrel assembled with the second lens at this time is glued to the first mirror. The first through hole of the cylinder is prevented from sliding against each other after being subjected to an external force.