TWI403772B - Lens module and assembling method for same - Google Patents

Abstract

A lens module includes at least a barrel and at least a lens received in the barrel. The lens includes a main portion and a connecting portion. At least a lens-securing structure is set on the inside wall of the barrel for securing the lens. The connecting portion of the lens is connected with the lens-securing structure for fixing the lens in the barrel. An assembling method for the lens module is also provided.

Description

Lens module and lens module assembly method

The invention relates to a lens module, in particular to a lens module for a camera module of a mobile communication device and a lens module assembly method thereof.

In recent years, with the development of optical products, the application range of optical lenses has continued to expand, such as digital cameras and mobile phones with camera functions. Since the optical lens and the lens module including the optical lens require high precision. Therefore, the assembly process of the lens module requires high precision and stability to ensure production efficiency and yield.

Generally, the lens module is assembled by sequentially placing the optical components into the lens barrel, for example, the lens 1, the aperture plate, the lens 2, the spacer film, and the infrared cut-off piece are sequentially placed in the lens barrel. The distance between the lens and the lens is controlled by the thickness of the aperture or liner between them. However, when the aperture sheet or the spacer sheet is burred, the distance between the lenses is changed, so that the optical performance of the entire lens module is lowered.

In the above assembly method, it is necessary to wait until all the optical components are assembled in the lens barrel, and then the optical test system can be used to measure whether the lens in the lens module is eccentric. If the lens is eccentric, the lens module needs to be disassembled and reassembled and adjusted. Reduce assembly efficiency.

In view of this, it is necessary to provide a lens module and a lens module assembly method that can effectively control the lens pitch and effectively improve the assembly efficiency.

A lens module includes: at least one lens barrel and is disposed in the lens barrel At least one lens, at least one lens fixing structure is disposed inside the lens barrel, the lens includes a main body portion and a connecting portion connected to the main body portion, and the connecting portion cooperates with a lens fixing structure on the inner side of the lens barrel to achieve a lens Fixed in the lens barrel.

A lens module assembly method includes the steps of: providing a lens element including a connecting portion and a lens barrel provided with an opening on the side and a lens fixing structure on the inner side, and applying the adhesive to the side surface and the surface of the connecting portion; a lens element enters the lens barrel from the opening, the lens element cooperates with the lens fixing structure to achieve fixation of the lens element in the lens barrel; and optical axis direction and optical performance of the lens element by using an optical test system Adjust and test until the requirements are met, and the adhesive is solidified to firmly bond the lens element to the lens barrel.

Compared with the prior art, the lens module has a lens fixing structure disposed on the inner side of the lens barrel, and the lens and the lens fixing structure cooperate to achieve the fixing of the lens in the lens barrel, and the lens fixing structure has a certain distance therebetween, thereby making the lens barrel inner The distance between the lenses is fixed, which effectively ensures the optical performance of the lens module.

In addition, the lens module assembly method adjusts and tests the optical axis direction and optical performance of the lens component in the lens barrel during assembly, which can effectively save assembly time and improve assembly efficiency.

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

Please refer to FIG. 1 and FIG. 2 together for the lens module 100 according to an embodiment of the present invention. The lens module 100 includes a lens barrel 12 and a plurality of lens elements 18. The lens element 18 of the present embodiment includes a lens group 14 and an infrared cut filter 16.

The lens barrel 12 is used to carry the lens element 18 in the lens module 100. The inside of the lens barrel 12 is provided with a plurality of lens fixing structures corresponding to the lens elements 18. In this embodiment, the grooves 122 are inserted into the grooves 122 to be fixed in the lens barrel 12. Preferably, the side of the barrel is formed with an opening 124 serving as an inlet for assembling the lens element 18 into the barrel 12. The outer side of the lens barrel 12 is provided with an external thread 126 which is fixed in the lens housing (not shown) and movable in the optical axis direction of the lens module 100. When the lens barrel 12 is assembled into the lens housing, it can be engaged with the internal thread on the inner side of the lens housing to move the lens barrel 12 in the lens housing along the optical axis direction of the lens module 100 to focus the lens module 100.

The lens barrel 12 houses the lens group 14 adjacent to one end of the object side of the lens module 100. Correspondingly, the lens barrel 12 receives the infrared cut filter 16 adjacent to one end of the image side opposite to the object side of the lens module 100.

The lens set 14 of the present embodiment includes two lenses 142 and 144. The lens 142 is now taken as an example. The lens 142 includes a main body portion 142a that functions to conduct light, and a connecting portion 142b that connects the main body portion 142a to the lens barrel 12. Generally, the main body portion 142a has a circular cross section in a direction perpendicular to the optical axis thereof, and the connecting portion 142b is a protrusion provided around the side surface of the main body portion 142a and is integrated with the main body portion 142a. The lens 142 is inserted into the lens barrel 12 from the opening 124. Therefore, the design of the connecting portion 142b of the present embodiment is as long as it conforms to the optical axis of the main body portion 142a. When the optical axes of the lens module 100 are parallel, the lens can enter the lens barrel 12 through the opening 124. The ratio of the size of the opening 124 to the lens barrel 12 in the radial direction of the lens barrel 12 is preferably in the range of 1/4 to 2/5. The lens 144 and the infrared cut filter 16 respectively include a connecting portion 144b and 16b, which are assembled similarly to the lens 142.

The process of assembling the lens group 14 and the infrared cut filter 16 into the lens barrel 12 will be described below with reference to FIGS. 1 and 2:

1. Apply the adhesive to the side surface and the surface of the connecting portion 142b of the lens 142. Preferably, the adhesive has a certain solidification time.

2. The lens 142 enters the lens barrel 12 from the opening 124 and the connection portion 142b is placed into the groove 122.

3. The lens 144 and the infrared cut filter 16 are assembled into the lens barrel 12 by the same method as in the steps 1 and 2.

4. Using an optical test system (not shown) to test and adjust the optical axis direction and optical performance of the lens set 14 incorporated into the lens barrel 12 until it meets the requirements, and the adhesive is to solidify the lenses 142, 144 and infrared. After the cut filter 16 is firmly coupled to the lens barrel 12, the lens module 100 is assembled.

It can be understood that the above steps can also be adjusted. For example, the lens 144 or the infrared cut filter 16 can be assembled first, and is not limited to the embodiment.

It is also understood that the infrared cut filter 16 can also be incorporated into the lens barrel 12 by other methods, such as providing a spacer sheet between the infrared cut filter 16 and the lens adjacent thereto, and then directly through the adhesive. Bonded to the liner sheet. In addition, it may be part of the main body of the lenses 142, 144 The surface is coated with an opaque material instead of the aperture sheet to control the amount of light entering.

Further, the lens barrel 12 may not be provided with the opening 124, and the lens element is inserted into the lens barrel 12 by the axial end portion of the lens barrel 12. As shown in FIG. 3, the lens fixing structure may further be two oppositely disposed protrusions 128 protruding from the inner side of the lens barrel 12a. The connecting portions of the lens elements are disposed on the two protrusions 128 and the mirror. The groove formed by the inner surface of the barrel 12a is fitted to be fixed. Of course, the lens fixing structure may also be other structures, and is not limited to the embodiment.

Compared with the prior art, the lens module 100 of the present embodiment is provided with a groove 122 in the lens barrel 12, and the connecting portion of the lens element cooperates with the groove 122 to dispose the lens element in the lens barrel 12, due to the groove 122 Since the pitch is fixed, the distance between the lenses in the lens element is fixed, so that the assembly yield of the lens module 100 is improved. The optical performance test of the lens element and the adjustment of the optical axis direction of the lens are in the process of assembly, which can effectively save assembly time and improve assembly efficiency. In addition, the lens module 100 of the embodiment saves the cost by eliminating the spacer sheet and the aperture sheet.

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 the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application.

100‧‧‧ lens module

12,12a‧‧‧Mirror tube

122‧‧‧ Groove

124‧‧‧ openings

126‧‧‧ external thread

128‧‧‧ bumps

14‧‧‧ lens group

142,144‧‧‧ lenses

142a‧‧‧ Main body

142b, 144b, 16b‧‧‧ Connections

16‧‧‧Infrared cut filter

18‧‧‧ lens components

1 is a perspective exploded view of a lens module according to an embodiment of the present invention; 2 is a partial cross-sectional view showing a combination of the lens modules of FIG. 1; and FIG. 3 is a perspective view showing another embodiment of the lens barrel of the lens module of the present invention.

100‧‧‧ lens module

12‧‧‧Mirror tube

122‧‧‧ Groove

14‧‧‧ lens group

142,144‧‧‧ lenses

142a‧‧‧ Main body

142b, 144b, 16b‧‧‧ Connections

16‧‧‧Infrared cut filter

18‧‧‧ lens components

Claims (7)

A lens module includes: at least one lens barrel and a lens element disposed in the lens barrel including at least one lens, wherein the lens barrel is provided with at least one lens fixing structure, and a part of the surface of the lens is opaque The material functions to control the amount of light entering, and the lens includes a main body portion and a connecting portion connected to the main body portion, and the connecting portion cooperates with the lens fixing structure on the inner side of the lens barrel to fix the lens in the lens barrel. The lens module of claim 1, wherein the lens element further comprises an infrared cut filter, which is received at one end of the image side of the lens barrel. The lens module of claim 1, wherein an opening is formed on a side of the lens barrel to allow the lens to enter the lens barrel from the opening for assembly. The lens module of claim 1, wherein the lens fixing structure is two oppositely disposed protrusions. The lens module of claim 3, wherein the size of the opening ranges from 1/4 to 2/5 in a radial direction of the lens barrel. The lens module of claim 2, wherein a spacer sheet is disposed between the lens and the infrared cut filter, and the infrared cut filter is adhered to the spacer by an adhesive. Sheet surface. The lens module of claim 2, wherein a lens fixing structure corresponding to the infrared cut filter is disposed inside the lens barrel, and the infrared cut filter comprises a connecting portion, the connection The portion cooperates with the lens fixing structure to fix the infrared cut filter in the lens barrel.