TWI408485B - Assembling method for lens module - Google Patents

Description

Assembly method of lens module

The invention relates to a method for assembling a lens module.

Lens modules are widely used in cameras or optical instruments, and are usually composed of optical components such as a lens barrel and a lens holder. 1 is a lens module 10 including a lens holder 12, a lens barrel 14, a lens group 16, a spacer ring 18, and a filter 20. The lens group 16, the spacer ring 18, and the filter 20 are sequentially fixed in the lens barrel 14 in the optical axis direction, and the spacer ring 18 is closely fixed to the filter 20. The outer wall of the lens barrel 14 and the inner wall of the lens holder 12 are provided with screws, and the lens barrel 14 is screwed into the lens holder 12 to be fixed.

In the assembly process of the lens module, the components to be bonded are generally fixed by a dispensing process, and the components include optical elements such as filters and spacer rings. The specific method is to use a small dispensing needle to apply the glue drop point at the intersection of the filter and the spacer ring.

However, this method has many problems in automatic dispensing. For example, the dispensing needle needs multiple positioning, which is not only time consuming, but also easily causes the dispensing needle to be misaligned, which causes the dispensing failure to affect the dispensing quality. In the automatic dispensing process, it is impossible to control the amount of dispensing according to the specific situation, which often causes the problem of too much or too little dispensing. Excessive dispensing will spill over to other components and cause contamination. Too little dispensing will result in poor bonding. These will directly affect the quality of the lens module, because one of the reasons for the failure of the lens module during use is the drop of the filter in the lens module.

In view of this, it is necessary to provide a lens module assembly method capable of improving assembly yield. The invention provides a method for assembling a lens module. The method comprises the steps of: placing a lens group in a lens barrel; loading a spacer ring into the lens barrel; applying a glue to the glue to be glued; removing the spray gun, placing the filter in the lens barrel and placing it on the spacer ring .

Compared with the prior art, in the assembly process of the lens module, the present invention uses a spray gun instead of a needle dispensing device to perform dispensing, so that the glue adheres to the optical component interface to be bonded in a mist form. When the instantaneous amount of glue is too large, due to the control of the nozzle and the high pressure gas, the glue in the spray gun will not be immediately ejected to cause fouling on other components. Moreover, the spray gun is used for sizing, and the coating is relatively uniform, which effectively ensures the quality of the dispensing, enhances the adhesion between the optical components, and reduces the probability that the lens module will fail due to the detachment of the filter.

10‧‧‧Lens module

12, 32‧‧‧ lens mount

14, 34‧‧ ‧Mirror tube

16, 36‧ ‧ lens group

18, 38‧‧‧ spacer ring

20, 40‧‧‧ Filters

340‧‧‧Mirror port

342‧‧‧Mirror tube side wall

360‧‧‧first lens

362‧‧‧second lens

380‧‧‧ Upper surface of spacer ring

44‧‧‧Testing device

46‧‧‧Base

48, 50‧‧‧ spray gun

480, 502‧‧‧ spray gun body

482, 506‧‧‧ nozzle

484, 510‧‧‧Compressed gas pipeline

486, 508‧‧‧ liquid material pipeline

504‧‧‧ sprinkler

Figure 1 is a schematic diagram of a lens module.

2 is a flow chart of a method for assembling a lens module according to an embodiment of the present invention.

3 to FIG. 5 are schematic diagrams showing a method of assembling a lens module according to an embodiment of the present invention.

Figure 6 is a schematic illustration of a spray gun used in an assembly process provided by an embodiment of the present invention.

Figure 7 is a schematic illustration of a spray gun used in an assembly process provided by another embodiment of the present invention.

FIG. 8 is a schematic diagram of a lens module assembly method according to another embodiment of the present invention.

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

This embodiment provides a method for assembling a lens module. Referring to FIG. 2 and referring to FIG. 3 to FIG. 5 simultaneously, a lens holder 32, a lens barrel 34, a lens group 36, a spacer ring 38, and a filter 40 are provided. The lens group 36 includes a first lens 360 and a second lens 362.

First, the cleaned second lens 362 and the first lens 360 are sequentially loaded into the lens barrel 34 and fixed to the mirror. In the tube 34. The lens barrel 34 is screwed into the lens mount 32 to be fixed. The first lens 360 and the second lens 362 may be spherical lenses or aspherical lenses.

Next, the lens barrel 34 and the lens holder 32 are placed in the test device 44, and the positions of the first lens 360, the second lens 362, and the test device 44 are adjusted to perform focusing. The test device 44 includes an image sensor 440 that can be focused by the image sensor 440 and an external chip (not shown). The image sensor can be a Charge Coupled Device (CCD) image sensor or a Complementary Metal-Oxide Semiconductor (CMOS) image sensor.

The lens barrel 34 and the lens holder 32 are taken out from the test device 44, and the lens holder 32 is fixed to a uniformly rotatable base 46, and the optical axis of the lens group 36 is coincident with the rotation axis of the base 46. The spacer ring 38 is fixed in the lens barrel 34, and the spacer ring 38 is located between the first lens 360 and the barrel port 340.

The position of the lance 48 is adjusted to align the spacer ring 38 with the barrel side wall 342. The spray gun 48 is opened and the base 46 is simultaneously rotated at a constant speed, during which the position of the spray gun 48 remains unchanged. The glue sprayed from the lance 48 is only uniformly sprayed onto the upper surface 380 of the spacer ring 38 and the barrel side wall 342 without spilling over other optical components. When the base 46 is rotated one revolution, the base 46 is stopped to rotate while the spray gun 48 is closed. The spray gun 48 is lifted away from the table, and the filter 40 is placed in the lens barrel 34 and placed on the upper surface 380 of the spacer ring 38.

Referring to FIG. 6, the spray gun 48 mainly includes a body 480. The body 480 has a nozzle 482 at one end thereof, and the other end of the body communicates with the compressed gas line 484 and the liquid material line 486. The compressed gas ejects the liquid material through the nozzle 482. And atomization. In this embodiment, the liquid material is a glue having a viscosity coefficient of 100 to 6000 cps.

In another preferred embodiment of the present invention, the multi-head spray gun 50 can also be used to spray glue to the upper surface 380 of the spacer ring 38 and the side wall 342 of the barrel. Please refer to FIG. 7, the multi-nozzle spray gun 50 pack A body 502 is included. One end of the body 502 is a pie-shaped spray head 504 having a plurality of uniformly arranged convex nozzles 506 at the circumference of the spray head 504. The other end of the body 502 communicates with the liquid material line 508 and the compressed gas line 510, and the compressed gas sprays the glue through the nozzle 506 to atomize. Referring to FIG. 8, the nozzle 504 of the spray gun 50 is matched with the size of the lens barrel 34 of the lens module to be assembled. During the assembly process, a plurality of nozzles 506 are aligned with the joint of the spacer ring 38 and the lens barrel side wall 342. The glue sprayed from the lance 50 is sprayed only on the upper surface 380 of the spacer ring 38 and the barrel side wall 342 without spilling over other optical components. Using the multi-nozzle nozzle 504, the glue can be uniformly applied to the upper surface 380 of the spacer ring 38 of the lens module to be assembled at one time without rotating the lens barrel 34 and the lens holder 32.

Although embodiments of the present invention use a spray gun only during sizing of the spacer ring during assembly, a spray gun can be used to smear other optical components during assembly.

The above-mentioned assembly method for the lens module has the advantages that the dispensing is performed by using a spray gun instead of the needle dispensing device, and the glue is attached to the optical component interface to be bonded in a mist-like manner. When the instantaneous amount of glue is too large, due to the control of the nozzle and the high pressure gas, the glue in the spray gun will not be immediately ejected to cause fouling on other components. Moreover, the spray gun is used for sizing, and the coating is relatively uniform, which effectively ensures the quality of the dispensing, enhances the adhesion between the optical components, and reduces the probability that the lens module will fail due to the detachment of the filter.

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.

32‧‧‧ lens mount

34‧‧‧Mirror tube

340‧‧‧Mirror port

342‧‧‧Mirror tube side wall

36‧‧‧ lens group

360‧‧‧first lens

362‧‧‧second lens

38‧‧‧ spacer ring

380‧‧‧ Upper surface of spacer ring

46‧‧‧Base

48‧‧‧ spray gun

Claims (5)

A method for assembling a lens module, comprising the steps of: placing a lens group in a lens barrel; placing a spacer ring in the lens barrel; using a spray gun to apply glue to a place to be glued; and removing the spray gun, and filtering the filter Put it into the spacer ring in the lens barrel and fix it by glue. The method of assembling a lens module according to claim 1, wherein the spray gun is a single nozzle spray gun, and in the process of glueing the spray gun, the method further comprises the following steps: keeping the spray gun stationary, the lens barrel along the lens group The optical axis rotates. The method of assembling a lens module according to claim 1, wherein the spray gun is a multi-nozzle spray gun, and the spray gun comprises a plurality of evenly arranged nozzles, and in the process of glueing with the spray gun, several nozzles are simultaneously gum. The method of assembling a lens module according to claim 1, wherein after the lens group is placed in the lens barrel, the method further comprises the steps of: mounting the lens barrel on the lens holder; and attaching the lens holder and the lens barrel Placed in the test device for focusing; and the lens holder and the lens barrel are removed from the test device. The method of assembling a lens module according to the fourth aspect of the invention, wherein, after the lens barrel is mounted in the lens holder, before the glue is applied to the lens holder, the method further comprises the steps of: fixing the lens holder to a uniform rotation On the pedestal, the optical axis of the lens group coincides with the rotation axis of the susceptor.