TWI453492B - 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 that is open at both ends and penetrates through, and a lens holder that cooperates with the lens barrel. The lens barrel includes, in order from the object side to the image side, a shaft portion connected to each other and a first thread portion provided with an external thread; the lens holder is provided with a through hole for receiving the lens barrel, and the mirror base is self-object The side to image side includes, in order, a shaft hole portion connected to each other and a second thread portion provided with an internal thread that cooperates with the external thread, the external thread forming a loose fit with the internal thread so that the two are not interlocked The outer diameter of the shaft portion is smaller than the outer diameter of the outer thread, and the first thread portion has a first end surface connecting the shaft portion and the first thread portion toward the object side, The inner diameter of the shaft hole portion is smaller than the outer diameter of the inner thread, the shaft hole portion has a second end surface connecting the shaft hole portion and the second thread portion toward the image side, and the lens module further includes An elastic member disposed at a periphery of the shaft portion and located between the first end surface and the second end surface.

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 shaft portion 2011 and a first thread portion 2012 that are connected to each other. In the present embodiment, the shaft portion 2011 has a cylindrical axis shape, and of course, it may have a stepped shaft shape. The first threaded portion 2012 is provided with an external thread 2013. An outer diameter of the shaft portion 2011 is smaller than an outer diameter of the outer thread 2013, whereby an end of the first thread portion 2012 close to the shaft portion 2011 forms an orientation side with the shaft portion 2011 The first end face 2014. The first end surface 2014 connects the shaft portion 2011 and the first thread portion 2012 and faces the object side.

The lens holder 202 defines a through hole 2020 for receiving the lens barrel 201. The lens holder 202 includes a shaft hole portion 2021 and a second thread portion 2022 which are connected to each other from the object side to the image side. The shaft hole portion 2021 forms a shaft hole engagement with the shaft portion 2011 of the lens barrel 201. The second threaded portion 2022 is provided with an internal thread 2023 that loosely engages with the external thread 2013 of the lens barrel 201. An inner diameter of the shaft hole portion 2021 is smaller than an outer diameter of the inner thread 2023, whereby an end of the shaft hole portion 2021 adjacent to the second thread portion 2022 and the second thread portion 2022 form an image-facing side. The second end face 2024. The second end surface 2024 connects the shaft hole portion 2021 and the second thread portion 2022 toward the image side.

The external thread 2013 of the lens barrel 201 is loosely engaged with the internal thread 2023 of the lens holder 202 so that the two are not interlocked therebetween, and the external thread 2013 and the lens barrel 201 and the lens holder 202 are not passed. The internal thread 2023 is locked. Therefore, there is no difference or unevenness in the locking force between the different threads in the threaded tight fit between the lens barrel 201 and the lens holder 202, thereby avoiding the occurrence of biting in the thread matching.

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.

In the present embodiment, the spring 203 is an annular spring having an annular portion 2030 and a resilient piece 2031 provided on the annular portion 2030. One end of the elastic piece 2031 is connected to the annular portion 2030, and the other end is lifted toward one end surface away from the elastic piece 2031 to form a free end. The spring 203 is sleeved on the periphery of the shaft portion 2011 of the lens barrel 201 and disposed between the first end surface 2014 and the second end surface 2024. Therefore, when the spring 203 is compressed, a force is formed on the first end surface 2014 and the second end surface 2024, so that the loosely fitted external thread 2013 and the internal thread 2023 abut against each other to form a locking force, that is, the spring 203. The force of the lens barrel 201 and the lens holder 202 can be interlocked with each other. At the same time, when the lens module 20 is in focus, the force of the spring 203 can maintain the stability when the lens barrel 201 and the lens holder 202 are locked, and the phenomenon that the lens barrel 201 is tilted relative to the lens holder 202 to cause the optical axis to tilt.

In the embodiment, the elastic piece 2031 is equally formed on the annular portion 2030 of the spring 203, and the elastic piece 2031 is opened toward the same side of the annular portion 2030. Thereby, when the spring 203 that is placed around the lens barrel 201 is compressed, an urging force that is equally distributed along the outer circumferential surface of the shaft portion 2011 of the lens barrel 201 and that is the same as the optical axis direction of the lens module 20 is formed. Of course, the elastic pieces 2031 may also be respectively opened to opposite sides of the annular portion 2030.

In this embodiment, the elastic piece 2031 is provided with four pieces. Of course, three, five or six pieces may be equally provided. Further, the spring 203 is not limited to the annular spring in the embodiment, and may be other elastic members such as 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 the same as the optical axis direction of the lens module 20 may be generated.

Preferably, the lens barrel 201 cooperates with the shaft hole of the lens holder 202 to form a transition fit or a clearance fit, and after the lens barrel 201 is engaged with the lens holder 202, the shaft portion 2011 of the lens barrel 201 The outer circumferential surface and the inner circumferential surface of the shaft hole portion 2021 of the lens holder 202 are fitted to each other. Thereby, the shaft hole between the shaft portion 2011 and the shaft hole portion 2021 has a guiding action, and relative rotation between the lens barrel 201 and the lens holder 202 is easily realized, 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.

Further, the end surface of the lens barrel 201 near the image side is provided with a card slot 2016. When the lens module 20 is assembled, the lens barrel 201 can be clamped or fixed by the fixture and the card slot 2016, so as to facilitate the lens barrel 201. The lens barrel 201 is assembled and matched with the lens holder 202.

Further, a groove 2017 is provided at an end of the lens barrel 201 facing the object side, and the groove 2017 is used for cooperating with a focus ring (not shown) to adjust the lens module 20 through the focus ring. focal.

When the lens module 20 is assembled, the spring 203 is sleeved into the shaft portion 2011 of the lens barrel 201 and abuts against the first end surface 2014, and then the fixture is engaged with the card slot 2016 to fix the lens barrel 201, and then The lens holder 202 is placed into the lens barrel 201 and rotated as appropriate until the lens barrel 201 and the lens holder 202 are assembled in position. Of course, the lens holder 202 can also be fixed during assembly, and then the lens barrel 201 is clamped and rotated by the jig with the jig 2017 until the lens barrel 201 and the lens holder 202 are assembled.

When focusing the lens module 20, the loose fit between the lens barrel 201 and the lens holder 202 can achieve lighter focus adjustment, and the shaft hole between the lens barrel 201 and the lens holder 202 has a certain guiding effect. Therefore, it is easy to control the torque/torque between the lens barrel 201 and the lens holder 202, facilitating focusing. In addition, the action of the spring 203 can both lock the loosely fitted lens barrel 201 and the lens holder 202 to each other, and ensure the stability of the lens barrel 201 and the lens holder 202 during the focusing process.

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‧‧‧Axis

2012‧‧‧First threaded part

2013‧‧‧ external thread

2014‧‧‧ first end face

2016‧‧‧ card slot

2017‧‧‧ Groove

2020‧‧‧through hole

2021‧‧‧ shaft hole

2022‧‧‧Second thread

2023‧‧‧ internal thread

2024‧‧‧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 II-II direction.

20‧‧‧Lens module

201‧‧‧Mirror tube

202‧‧‧Mirror seat

203‧‧ ‧ spring

2011‧‧‧Axis

2012‧‧‧First threaded part

2013‧‧‧ external thread

2014‧‧‧ first end face

2016‧‧‧ card slot

2017‧‧‧ Groove

2020‧‧‧through hole

2021‧‧‧ shaft hole

2022‧‧‧Second thread

2023‧‧‧ internal thread

2030‧‧‧Rings

2031‧‧‧Shrap

Claims (9)

A lens module includes: a lens barrel that is open at both ends and penetrates, the lens barrel includes a shaft portion and a first thread portion that are connected to each other from the object side to the image side, and the first thread portion is provided An external thread; and a lens holder that cooperates with the lens barrel, the lens holder is provided with a through hole for receiving the lens barrel, and the lens holder includes a shaft hole portion and a connecting portion from the object side to the image side in order a second threaded portion, wherein the second threaded portion is provided with an internal thread that cooperates with the external thread, wherein: the external thread forms a loose fit with the internal thread so that the two are not interlocked, the shaft is The outer diameter of the portion is smaller than the outer diameter of the outer thread, and the first threaded portion has a first end surface connecting the shaft portion and the first thread portion toward the object side, and an inner diameter of the shaft hole portion Less than an outer diameter of the internal thread, the shaft hole portion has a second end surface connecting the shaft hole portion and the second thread portion toward the image side, and the lens module further includes an elastic member, the elasticity An element is disposed around the periphery of the shaft portion and located at the first end surface and the second end Between. 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 elastic element has the same force direction as the optical axis of the lens module to lock the lens barrel and the lens holder. 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 end surface of the lens barrel facing the image side is provided with a card slot. The lens module of claim 1, wherein the number of threads of the external thread and the internal thread is 2 to 3 turns. The lens module of claim 1, wherein: the end of the lens barrel facing the object side is further provided with a groove for engaging with the focus ring.