Lens module

The present invention discloses a lens module, which includes a base, an elastic element, an optical lens, and a receiving element. The base includes a bottom portion and an extension portion extending vertically along the bottom portion. A stepped surface is formed where the bottom portion is connected with the extension portion. An internal thread is formed on an inner wall of the extension portion. The elastic element is disposed on the stepped surface. The receiving element is used for receiving the optical lens. The receiving element includes a threaded portion and a receiving portion connected with the threaded portion. The threaded portion is provided with an external thread. The external thread matches with the internal thread. The external thread connects the internal thread by threading to connect the receiving element with the base by threading. The elastic element abuts against the threaded portion to provide a pretightening force for the receiving element.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application of International Application No. PCT/CN2014/079352, filed Jun. 6, 2014, the content of which is incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION

The present invention relates to a lens module.

As the photography technology becomes mature and sophisticated, requirements for photography become increasingly higher. Filters, such as UV filters, portrait filters, diffusion filters, and starlight filters, used as an auxiliary in professional photography have already been applied widely to amateur photography. As a result, people can capture highlights whenever and wherever possible by using the equipment very conveniently. The existing fixed mode of the filters is mainly applied to ordinary handheld cameras, and the lens would loosen and come off due to vibration if applied to an aerial vehicle, which may affect the shooting.

BRIEF SUMMARY OF THE INVENTION

A technical problem to be mainly solved in the present invention is to provide a lens module that can solve the problem of loosening and coming off due to vibration.

To solve the foregoing technical problem, a technical solution adopted in the present invention is as follows. A lens module is provided, including: a base, which includes a bottom portion and an extension portion extending vertically along the bottom portion, with a stepped surface being formed where the bottom portion is connected with the extension portion, and an internal thread being formed on an inner wall of the extension portion; an elastic element disposed on the stepped surface; an optical lens; and a receiving element used for receiving the optical lens, the receiving element including a threaded portion and a receiving portion connected with the threaded portion, the threaded portion being provided with an external thread, the external thread matching with the internal thread, the external thread being connected with the internal thread by threading to connect the receiving element with the base by threading, and the elastic element abutting against the threaded portion to provide a pretightening force for the receiving element.

The sum of the height of the threaded portion along a direction perpendicular to the stepped surface and the height of the elastic element along the direction perpendicular to the stepped surface is greater than the height of the extension portion along the direction of the stepped surface.

Both the bottom portion and the extension portion are ring-like, and the extension portion and the bottom portion are integrally formed.

The lens module further includes an abutting member. The abutting member is received in the extension portion and fixed to the stepped surface, and the abutting member is disposed between the optical lens and the stepped surface.

The height of the abutting member along a direction perpendicular to the stepped surface is equal to a distance from the optical lens to the stepped surface, and a top surface of the abutting member away from the stepped surface abuts against the optical lens.

The lens module further includes multiple bolts. The bottom portion is provided with multiple threaded holes. An outer wall of the abutting member is provided with multiple threaded studs in a manner of being corresponding to positions of the multiple threaded holes. The multiple threaded bolts, each corresponding to one of the threaded holes, are connected with the respective threaded studs by threading to fix the abutting member onto the stepped surface.

Two sides of each of the threaded holes are provided with a positioning column respectively, and each of the threaded studs is located between two of the positioning columns.

The abutting member is fixed onto the stepped surface by glue.

An inner wall of the abutting member includes an inclined face. The diameter of the inclined face gradually decreases from one end away from the stepped surface to the other end close to the stepped surface, and the inclined face is provided with multiple decorative steps.

A circular first opening is formed on the bottom portion. The abutting member is a hollow ring-like structure, which includes a circular second opening. The diameter of the second opening is less than that of the first opening. The diameter of one end of the inclined face away from the stepped surface is greater than the diameter of the second opening and the diameter of the first opening, but is less than the inner diameter of the extension portion, and the diameter of one end of the inclined face close to the stepped surface is less than the diameter of the second opening and the diameter of the first opening.

The elastic element abuts against the inner wall of the extension portion.

The elastic element is made of rubber.

One end of the receiving portion away from the threaded portion is provided with a third opening. One end of the receiving portion close to the third opening is provided with a first receiving groove, and the first receiving groove is used for receiving the optical lens.

The end of the receiving portion close to the third opening is further provided with a second receiving groove. The first receiving groove is in communication with the second receiving groove. The lens module further includes a gasket, and the gasket is received in the second receiving groove and at the same time abuts against the optical lens.

The thickness of the optical lens is equal to the depth of the first receiving groove, and the thickness of the gasket is equal to the depth of the second receiving groove.

The gasket is made of a metal material and is provided with a notch.

The lens module is disposed on an unmanned aerial vehicle.

The optical lens is a filter.

The present invention has the following beneficial effects. As different from the situation in the prior art, in the lens module according to the present invention, the elastic element abuts against the threaded portion and is used for providing a pretightening force for the receiving element. Therefore, the receiving element can be prevented from loosening and coming off during vibration. At the same time, as the extension portion of the base is provided with an internal thread, and the external thread is connected with the internal thread of the extension portion by threading, the volume of the receiving element can be effectively reduced and the manufacturing cost is reduced.

DETAILED DESCRIPTION OF THE INVENTION

The technical solution in embodiments of the present invention is clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It is apparent that the embodiments described are merely some embodiments of the present invention instead of all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts should fall within the protection scope of the present invention.

Referring toFIGS. 1-4together, a lens module100according to an embodiment of the present application is disposed on an unmanned aerial vehicle (not shown). The unmanned aerial vehicle can be used as an auxiliary device for photographing, taking pictures, monitoring, and sampling, and it can be carried in an air-based field (for example, a rotor aircraft or a fixed wing aircraft), a water-based field (for example, a submarine or a ship), a land-based field (for example, a motor vehicle) or a space-based field (for example, a satellite, a space station, or a spaceship) and the like. The unmanned aerial vehicle includes a gimbal and a carried object carried on the gimbal. The gimbal is used to achieve fixing of the carried object, randomly adjust attitude of the carried object (for example, changing the height, tilt angle and/or direction of the carried object), and stably maintain the carried object on the determined attitude. The carried object may be a photographic device such as a camera and a video camera, which includes the lens module100.

The lens module100includes a base10, an abutting member20, an elastic element30, a receiving element40, an optical lens50, and a gasket60. The abutting member20and the elastic element30are received in the base10. The gasket60and the optical lens50are both received in the receiving element40, and the receiving element40is connected with the base10by threading and abuts against the elastic element30.

The base10is hollow and cylindrical, which includes a ring-like bottom portion11and an extension portion12extending vertically along the bottom portion11. The extension portion12is also ring-like. In this embodiment, the extension portion12is integrally formed with the bottom portion11. The radius of the extension portion12is greater than that of the bottom portion11, and thus a stepped surface110is formed where the bottom portion11is connected with the extension portion12. The bottom portion11is provided with three threaded holes111. On the stepped surface110, corresponding to the three threaded holes111, two sides of each of the threaded holes111are provided with a positioning column112respectively. In this embodiment, the positioning column112is integrally formed with the bottom portion11. A circular first opening114is formed in the bottom portion11.

It can be understood that, in other embodiments, the number of the threaded holes111is not limited to three, and may be set according to needs to two or more than three, for example.

It can be understood that, in other embodiments, all the six positioning columns112can be omitted to save the manufacturing cost.

In this embodiment, an internal thread120is formed on an inner wall of the extension portion12.

The abutting member20is also a hollow and cylindrical structure, which includes a circular second opening200. In this embodiment, the diameter of the second opening200is less than that of the first opening114. An outer wall of the abutting member20is provided with three threaded studs201in a manner of being corresponding to the three threaded holes111. The abutting member20is installed to the stepped surface110. An inner wall of the abutting member20includes an inclined face202, and the diameter of the inclined face202gradually decreases from one end that is away from the stepped surface110to the other end that is close to the stepped surface110. The inclined face202is provided with multiple decorative steps203. The diameter of one end of the inclined face202away from the stepped surface110is greater than the diameter of the second opening200and the diameter of the first opening114, but is less than the inner diameter of the extension portion12. The diameter of one end of the inclined face202close to the stepped surface110is less than the diameter of the second opening200and the diameter of the first opening114.

It can be understood that the number of the threaded studs201corresponds to that of the threaded holes111, and may also be set to two or more than three.

The elastic element30is made of a rubber material. In this embodiment, the diameter of the elastic element30is greater than that of the first opening114and is substantially equal to the inner diameter of the extension portion12. The elastic element30is disposed on the stepped surface110and abuts against the inner wall of the extension portion12.

It can be understood that the elastic element30may also be made of another elastic material, which is not limited to this embodiment.

The receiving element40includes a threaded portion401and a receiving portion402connected with the threaded portion401. The receiving element40is connected with the extension portion12by threading. Specifically, the threaded portion401is provided with an external thread4010, and the external thread4010matches with the internal thread120. The sum of the height of the threaded portion401along a direction perpendicular to the stepped surface110and the height of the elastic element30along the direction perpendicular to the stepped surface110is slightly greater than the height of the extension portion12along the direction of the stepped surface110. The external thread4010of the threaded portion401is connected with the internal thread120of the extension portion12by threading, and the elastic element30provides a pretightening force. As the lens module100of this embodiment is disposed on the unmanned aerial vehicle, the receiving element40can be prevented from loosening and coming off during vibration.

In this embodiment, the receiving element40is provided with an external thread4010, the extension portion12of the base10is provided with an internal thread120, and the external thread4010is connected with the internal thread120of the extension portion12by threading. This can effectively reduce the volume of the receiving element40and reduce the manufacturing cost.

One end of the receiving portion402away from the threaded portion401is provided with a third opening403. One end of the receiving portion402close to the third opening403is provided with a first receiving groove4021and a second receiving groove4022. The first receiving groove4021is in communication with the second receiving groove4022. The diameter of the first receiving groove4021is slightly greater than that of the second receiving groove4022.

In this embodiment, the optical lens50is a filter. The thickness of the optical lens50is substantially equal to the depth of the first receiving groove4021, and the optical lens50is received in the first receiving groove4021.

The gasket60is made of a metal material. In this embodiment, the gasket60is made of aluminum. In order to make it easy to install the gasket60to the second receiving groove4022, the gasket60is provided with a notch601. The thickness of the gasket60is substantially equal to the depth of the second receiving groove4022. The gasket60is received in the second receiving groove4022and at the same time abuts against the optical lens50. The inner diameter of the gasket60is greater than the diameter of one end of the inclined face202away from the stepped surface110.

It can be understood that the gasket60may also be made of another metal material, which is not limited to this embodiment.

In this embodiment, the lens module100further includes three bolts70, and the number of the bolts70corresponds to that of the threaded studs201. During assembly, the abutting member20first abuts against the stepped surface110of the base10, each of the threaded studs201is located between two of the positioning columns112to make each of the threaded studs201aligned with one of the threaded holes111. Then, three of the bolts70are, each corresponding to one of the threaded holes111, connected with the respective threaded studs201by threading to make the abutting member20fixed onto the stepped surface110and received in the extension portion12at the same time. Then, the elastic element30is disposed on the stepped surface110, and the elastic element30is sandwiched between the threaded studs201and the inner wall of the extension portion12. Afterwards, the optical lens50is disposed in the first receiving groove4021, and the gasket60is disposed in the second receiving groove4022and abuts against the optical lens50to make the optical lens50abut against the first receiving groove4021. Finally, the external thread4010of the receiving element40is connected with the internal thread120of the extension portion12by threading to connect the receiving element40with the base10by threading, and the threaded portion401of the receiving element40abuts against the elastic element30. As the abutting member20is disposed between the optical lens50and the stepped surface110, and the height of the abutting member20along the direction perpendicular to the stepped surface110is equal to the distance from the optical lens50to the stepped surface110, a top surface of the abutting member20away from the stepped surface110abuts against the optical lens50, and the elastic element30provides a pretightening force for the receiving element40.

It can be understood that, in other embodiments, it is also feasible to directly fix the abutting member20onto the stepped surface110by glue, which is not limited to this embodiment.

It can be understood that, in an actual application, the abutting member20may also be omitted, which is not limited to this embodiment.

In the lens module according to the present invention, the elastic element abuts against the threaded portion to provide a pretightening force for the receiving element. Therefore, the receiving element can be prevented from loosening and coming off during vibration. At the same time, as the extension portion of the base is provided with an internal thread, and the external thread is connected with the internal thread of the extension portion by threading, the volume of the receiving element can be effectively reduced and the manufacturing cost is reduced.

The above descriptions are merely embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process variation made by using contents of the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, should be likewise included in the patent protection scope of the present invention.