TWI453493B - Lens module - Google Patents

Description

Lens module

The present invention relates to an optical system, and more particularly to a lens module.

With the development of camera technology, the lens module has been widely used in various types of camera devices, and the fixed-focus lens module is the favorite of camera professionals. A conventional fixed-focus lens module generally includes a lens barrel, a lens holder, and a lens group, a spacer ring, and a filter housed in the lens barrel.

In the conventional fixed-focus lens module, the mirror base and the lens barrel are closely matched and locked by a thread, that is, a threaded fit forms a locking force between the lens barrel and the lens holder. When focusing, generally adjust the focus ring to adjust the distance between the lens group and the image sensor in the lens module, so that the lens module can obtain better imaging results. When assembling the lens module, align the first assembled part of the lens barrel with the corresponding part of the lens holder, and then rotate relative to each other until the lens barrel and the lens holder are assembled. The lens barrel and the lens holder and their assembly manners cause the following problems in the conventional lens module. In the thread matching and locking, there is generally a phenomenon in which the locking force between different threads is different or uneven, which makes the lens barrel and The torque/torque between the mirror mounts is not easy to control, ie it is not easy to adjust the precise position between the lens barrel and the mirror mount. Therefore, it is difficult to quickly obtain a better focus position by simply adjusting when focusing, which makes focusing difficult.

In view of this, it is necessary to provide a lens module that is easy to implement and can effectively improve the problems of the conventional lens module.

A lens module includes a lens barrel and a lens holder for housing the lens barrel. The lens barrel includes, in order from the object side to the image side, a first threaded portion and a shaft portion that are connected to each other; the first threaded portion is provided with an external thread; and the mirror holder includes interconnected elements from the object side to the image side in order. a second threaded portion and a shaft hole portion, wherein the second threaded portion is provided with an internal thread that cooperates with the external thread; the lens module further includes an elastic member disposed in the lens holder, the external thread and The internal thread forms a loose fit so as not to be interlocked therebetween, and an inner wall of the shaft hole portion is provided with a convex ring protruding inwardly, and the elastic member is disposed around the shaft hole portion and located at the An end surface of the convex ring facing the object side and an end surface of the lens barrel facing the image side end face.

Compared with the prior art, the lens barrel and the lens holder in the lens module of the present invention are matched by loosely fitting and non-locking threads, and the elastic element is used to lock the lens barrel and the lens holder. It is different from the way in which the lens barrel and the lens holder are closely matched and locked by the thread in the conventional lens module. Therefore, the lens module of the present invention has the following advantages: First, the locking force is not formed by the threaded engagement between the lens barrel and the lens holder. Therefore, there is no difference in the locking force between the screw threads in the conventional thread matching. Uniform phenomenon can avoid the focus adjustment process is difficult to adjust due to different or uneven locking force. Secondly, the process of assembling the lens barrel and the lens holder, the looseness of the thread makes the adjustment between the lens barrel and the lens holder easy to be adjusted, so that the phenomenon that the lens barrel and the lens holder are stuck with each other due to the incomplete positioning of the thread is less likely to occur. Quickly assemble the lens barrel module.

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

Referring to FIG. 1 , FIG. 2 and FIG. 3 , an embodiment of the invention provides a lens module 20 including a lens barrel 201 , a lens holder 202 and a spring 203 .

The lens barrel 201 is open at both ends and penetrates. The inside of the lens barrel 201 houses components such as a lens group, a spacer ring, and a filter (not shown). The lens barrel 201 includes, in order from the object side to the image side, a first threaded portion 2011 and a shaft portion 2012 that are connected to each other. The first threaded portion 2011 is provided with an external thread 2013. The shaft portion 2012 has a first end face 2015 facing the image side.

The lens holder 202 houses the lens barrel 201. The lens holder 202 includes a second threaded portion 2021 and a shaft hole portion 2022 which are connected to each other in order from the object side to the image side. The second threaded portion 2021 is provided with an internal thread 2023. The internal thread 2023 forms a loose fit with the external thread 2013 of the lens barrel 201 such that the internal thread 2023 and the external thread 2013 of the lens barrel 201 do not interlock with each other. The shaft hole portion 2022 forms a shaft hole engagement with the shaft portion 2012 of the lens barrel 201. The inner wall of the shaft hole portion 2022 is provided with an inwardly projecting convex ring 2024 having a second end surface 2025 facing the object side.

Preferably, the inner diameter of the shaft hole portion 2022 is smaller than the inner diameter of the inner thread 2023, whereby the lens barrel 201 can be smoothly loaded into the lens holder 202 from the object side group of the lens holder 202.

After the lens barrel 201 and the lens holder 202 are assembled in position, there is a gap between the convex ring 2024 and the first end surface 2015 of the lens barrel 201 facing the image side to mount the spring 203.

The spring 203 is an annular spring, and the outer diameter of the spring 203 is less than or equal to the inner diameter of the shaft hole portion 2022. The spring 203 is disposed on the shaft hole portion 2022 and located between the first end surface 2015 and the second end surface 2025.

Preferably, the spring 203 abuts against the first end surface 2015 and the second end surface 2025, whereby when the spring 203 is compressed, a force is formed on the first end surface 2015 and the second end surface 2025. Further, the force of the spring 203 can lock the lens barrel 201 and the lens holder 202 to each other. At the same time, when the lens module 20 is in focus, the force of the spring 203 can maintain the stability of the lens barrel 201 and the lens holder 202, and avoid the phenomenon that the lens barrel 201 is shaken and the optical axis is tilted.

The elastic piece 2031 is equally formed on the annular portion 2030 of the spring 203. In the embodiment, the elastic piece 2031 is opened in the same direction. Thereby, when the spring 203 provided in the shaft hole portion 2022 is compressed, a force that is equally distributed along the outer circumferential surface of the shaft portion 2011 of the lens barrel 201 and parallel to the optical axis of the lens module 20 is formed. Of course, the elastic piece 2031 can also be opened in the reverse direction.

In the embodiment, the elastic piece 2031 is provided with four pieces. Of course, three, five or six pieces may be equally provided as long as the outer circumferential surface of the shaft portion 2011 of the lens barrel 201 can be equally distributed. The force acting in parallel with the optical axis of the lens module 20 may be sufficient.

In this embodiment, the spring 203 is an annular spring. Of course, the spring 203 may also be a spring plate. Any force that is equally distributed along the outer circumferential surface of the shaft portion 2011 of the lens barrel 201 and that is parallel to the optical axis of the lens module 20 may be generated.

Preferably, the shaft hole portion 2022 is matched with the shaft hole of the shaft portion 2012 as a transition fit or a clearance fit, and after the lens barrel 201 is engaged with the lens holder 202, the shaft of the lens barrel 201 is axially shaped. The outer circumferential surface of the portion 2012 and the inner circumferential surface of the shaft hole portion 2022 of the lens holder 202 are bonded to each other. Thereby, the shaft hole between the shaft portion 2012 and the shaft hole portion 2022 has a guiding action, and relative rotation between the lens barrel 201 and the lens holder 202 is easily achieved, and the lens barrel 201 and the lens holder 202 are easily controlled. The torque/torque between them facilitates the assembly of the lens barrel 201 and the lens holder 202 as well as the focusing of the lens module 20.

The external thread 2013 of the lens barrel 201 is loosely engaged with the internal thread 2023 of the lens holder 202, whereby there is no thread tight fit between the lens barrel 201 and the lens holder 202, and the locking force between the screw teeth is different or not Uniform phenomenon avoids the occurrence of biting in the thread fit.

Preferably, the number of turns of the external thread 2013 and the internal thread 2023 is 2 to 3 turns, thereby facilitating the loose fit of the external thread 2013 and the internal thread 2023, and facilitating the lens barrel 201 and the mirror. Processing of the seat 202.

When the lens module 20 is assembled, the spring 203 is inserted into the shaft hole portion 2022 of the lens holder 202 and abuts against the second end surface 2025, and then the lens holder 202 is fixed, and the lens barrel 201 is inserted from the object side of the lens holder 202, and is appropriately The rotating barrel 201 is pushed until the lens barrel 201 and the lens holder 202 are assembled in position. At this time, the spring 203 is in a compressed state, and the lens barrel 201 and the lens holder 202 are mutually interlocked under the force of the spring 203.

When focusing the lens module 20, since the relatively uniform torque/torque between the lens barrel 201 and the lens holder 202 and the guiding action of the shaft hole matching, the focusing can be conveniently performed. Further, due to the action of the spring 203, the stabilization of the lens barrel 201 and the lens holder 202 during the focusing process can be ensured.

Compared with the prior art, the lens barrel and the lens holder in the lens module of the present invention are matched by loosely fitting and non-locking threads, and the elastic element is used to lock the lens barrel and the lens holder. It is different from the way in which the lens barrel and the lens holder are closely matched and locked by the thread in the conventional lens module. Therefore, the lens module of the present invention has the following advantages: First, the locking force is not formed by the threaded engagement between the lens barrel and the lens holder. Therefore, there is no difference in the locking force between the screw threads in the conventional thread matching. Uniform phenomenon can avoid the focus adjustment process is difficult to adjust due to different or uneven locking force. Secondly, the process of assembling the lens barrel and the lens holder, the looseness of the thread makes the adjustment between the lens barrel and the lens holder easy to be adjusted, so that the phenomenon that the lens barrel and the lens holder are stuck with each other due to the incomplete positioning of the thread is less likely to occur. Quickly assemble the lens barrel module.

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.

20‧‧‧Lens module

201‧‧‧Mirror tube

202‧‧‧Mirror seat

203‧‧ ‧ spring

2011‧‧‧First threaded part

2012‧‧‧Axis

2013‧‧‧ external thread

2015‧‧‧ first end face

2021‧‧‧Second thread

2022‧‧‧ shaft hole

2023‧‧‧ internal thread

2024‧‧‧ convex ring

2025‧‧‧second end face

2030‧‧‧Rings

2031‧‧‧Shrap

1 is an exploded perspective view of a lens module according to an embodiment of the present invention.

FIG. 2 is a perspective view of the lens module shown in FIG. 1 after assembly.

3 is a cross-sectional view of the lens module shown in FIG. 2 taken along the III-III direction.

20‧‧‧Lens module

201‧‧‧Mirror tube

202‧‧‧Mirror seat

203‧‧ ‧ spring

2011‧‧‧First threaded part

2012‧‧‧Axis

2013‧‧‧ external thread

2021‧‧‧Second thread

2022‧‧‧ shaft hole

2023‧‧‧ internal thread

2030‧‧‧Rings

2031‧‧‧Shrap

Claims (10)

A lens module includes: a lens barrel including a first threaded portion and a shaft portion connected to each other from the object side to the image side; the first threaded portion is provided with an external thread; and the housing is received a lens holder of the lens barrel, the mirror holder includes, in order from the object side to the image side, a second threaded portion and a shaft hole portion connected to each other, and the second threaded portion is provided with an internal thread that cooperates with the external thread; wherein: The lens module further includes an elastic member disposed in the lens holder, the external thread forming a loose fit with the internal thread so as not to be interlocked therebetween, and an inner wall of the shaft hole portion is provided a convex ring that protrudes inwardly, the elastic member being disposed around the axial hole portion between an end surface of the convex ring facing the object side and an end surface of the lens barrel facing the image side. The lens module of claim 1, wherein: after the lens barrel and the lens holder are assembled in position, a gap is formed between the convex ring and an end surface of the lens barrel facing the image side to set The elastic element. The lens module according to claim 1, wherein the elastic member abuts against an end surface of the convex ring facing the object side and an end surface of the lens barrel facing the image side. The lens module of claim 1, wherein the elastic element is an annular spring or a spring plate. The lens module of claim 1, wherein: the force direction of the elastic element is parallel to an optical axis of the lens module to lock the lens barrel and the lens holder. The lens module of claim 1, wherein the inner diameter of the shaft hole portion is smaller than the inner diameter of the inner thread to facilitate the assembly of the lens barrel into the lens holder. The lens module of claim 1, wherein the shaft portion of the lens barrel and the shaft hole portion of the lens holder form a shaft hole. The lens module according to claim 1, wherein an outer circumferential surface of the shaft portion of the lens barrel and an inner circumferential surface of the shaft hole portion of the lens holder are in contact with each other. The lens module of claim 1, wherein the lens barrel cooperates with the shaft hole of the lens holder to be a transition fit or a clearance fit. The lens module of claim 1, wherein: the number of threads of the external thread and the number of threads of the internal thread are 2 to 3 turns.