CN114217406B - Lens focusing mechanism, projection module and electronic equipment - Google Patents

Abstract

The invention discloses a lens focusing mechanism, a projection module and electronic equipment. The lens focusing mechanism comprises a lens, a fixed sleeve, a movable sleeve and a transmission assembly; the lens comprises a lens barrel and a lens arranged in the lens barrel; the fixing sleeve is sleeved outside the lens barrel and is provided with external threads; the movable sleeve is sleeved outside the fixed sleeve, the movable sleeve is provided with an internal thread, and the movable sleeve is in threaded connection with the fixed sleeve; the transmission component is in driving connection with the movable sleeve and the lens cone; the movable sleeve can rotate under the action of external force to axially move relative to the fixed sleeve so as to drive the transmission assembly to drive the lens to axially move. According to the technical scheme of the lens focusing mechanism, the movable sleeve is in threaded connection with the fixed sleeve, so that a user can achieve the purpose of focusing only by rotating the movable sleeve, focusing operation is simplified, and focusing efficiency is improved.

Description

Lens focusing mechanism, projection module and electronic equipment

Technical field

The present invention relates to the field of optical technology, and in particular to a lens focusing mechanism, a projection module and electronic equipment.

Background technique

With the development of science and technology, electronic imaging equipment is a display device that produces images and has been widely used in various scenarios. Equipment such as AR, VR, and projectors are increasingly favored by people.

For AR, VR, projectors and other equipment, the lens in the core component of the optical-mechanical module often requires focusing. The traditional focusing method is either suitable for one-time adjustment of the lens to find the best focusing distance. Automatic focusing of optical-mechanical products, but this method requires the development of automatic calibration equipment, which is expensive. When the total amount of product development is not high, the unit price of the product increases significantly. Either it is a manual focusing method that requires adjusting the lens position according to changes in the use environment. However, the current manual focusing method is complicated to operate, takes a long time, and has low focusing efficiency.

Contents of the invention

The main purpose of the present invention is to provide a lens focusing mechanism, which aims to simplify the structure of the focusing mechanism, facilitate user focusing, and improve focusing efficiency.

In order to achieve the above objectives, the lens focusing mechanism proposed by the present invention includes:

A lens, the lens includes a lens barrel and a lens installed in the lens barrel;

Fixed sleeve, the fixed sleeve is set on the outside of the lens barrel, and the fixed sleeve is provided with external threads;

A movable sleeve, the movable sleeve is set on the outside of the fixed sleeve, the movable sleeve is provided with internal threads, and the movable sleeve is threadedly connected to the fixed sleeve; and

A transmission assembly that drives and connects the movable sleeve and the lens barrel;

The movable sleeve can rotate under the action of external force to move axially relative to the fixed sleeve to drive the transmission assembly to drive the lens to move axially.

In an embodiment of the present invention, the transmission assembly includes:

A first limiting part, the first limiting part is provided on the inner wall of the movable sleeve, and the first limiting part is spaced apart from the end of the fixed sleeve to form an installation space;

a second limiting part, the second limiting part is provided on the outer wall of the lens barrel and is located in the installation space, and the second limiting part resists the first limiting part; and

An elastic member is connected between the second limiting part and the fixed sleeve.

In an embodiment of the present invention, the elastic member is a compression spring.

In an embodiment of the present invention, the compression spring is sleeved on the outer periphery of the lens barrel.

In one embodiment of the present invention, the first limiting part is an annular boss structure protruding inward from the inner wall of the movable sleeve;

And/or, the second limiting part is an annular boss structure protruding outward from the outer wall of the lens barrel.

In an embodiment of the present invention, in the radial direction, the end of the first limiting part is in contact with the outer wall of the lens barrel;

And/or, in the radial direction, the end of the second limiting part is in contact with the inner wall of the movable sleeve.

In one embodiment of the present invention, the transmission assembly includes a limiting boss and an annular groove. The central axis of the annular groove is collinear with the central axis of the lens barrel. The limiting boss extends into the annular groove. in the groove, and can slide along the circumferential direction of the annular groove;

One of the limiting boss and the annular groove is provided on the inner wall of the movable sleeve, and the other one is provided on the outer wall of the lens barrel.

In one embodiment of the present invention, the fixed sleeve is a lens barrel sleeve fixedly connected to the optical machine, and the movable sleeve is a nut set on the outside of the lens barrel sleeve.

In one embodiment of the present invention, the outer wall of the lens barrel is provided with an axially extending guide rail, the inner wall of the fixed sleeve is provided with a slide groove, and the guide rail is slidably matched with the slide groove.

In order to achieve the above object, the present invention also provides a projection module, including an optical engine and the above-mentioned lens focusing mechanism; wherein the fixed sleeve is fixedly connected to the optical engine; the light emitted by the optical engine passes through the The lens shoots out. The lens focusing mechanism includes:

A lens, the lens includes a lens barrel and a lens installed in the lens barrel;

Fixed sleeve, the fixed sleeve is set on the outside of the lens barrel, and the fixed sleeve is provided with external threads;

A movable sleeve, the movable sleeve is set on the outside of the fixed sleeve, the movable sleeve is provided with internal threads, and the movable sleeve is threadedly connected to the fixed sleeve; and

A transmission assembly that drives and connects the movable sleeve and the lens barrel;

The movable sleeve can rotate under the action of external force to move axially relative to the fixed sleeve to drive the transmission assembly to drive the lens to move axially.

In order to achieve the above object, the present invention also provides an electronic device, including the above-mentioned projection module.

In the lens focusing mechanism of the technical solution of the present invention, the lens is installed in the lens barrel, a fixed sleeve is provided outside the lens barrel, the fixed sleeve is provided with external threads, and a movable sleeve is installed outside the fixed sleeve, and the movable sleeve is provided with internal threads. It is threadedly connected to the fixed sleeve, and a transmission assembly is drivingly connected between the movable sleeve and the lens barrel, so that the movable sleeve can rotate under the action of external force to move axially relative to the fixed sleeve, and in turn can drive the transmission assembly to drive the lens to move axially. To achieve the effect of adjusting the lens focus. In this embodiment, through the threaded connection between the movable sleeve and the fixed sleeve, the user can achieve the purpose of focusing by simply rotating the movable sleeve, which simplifies the focusing operation and improves the focusing efficiency.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an embodiment of the lens focusing mechanism of the present invention.

Explanation of reference numbers:

label name label name 100 lens 200 Fixed sleeve 110 Lens barrel 300 activity set 111 The second limiting part 310 The first limiting part 120 lens 400 Elastic parts

The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), then the directional indications are only used to explain the position of a certain posture (as shown in the drawings). The relative positional relationship, movement conditions, etc. between the components under the display). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving “first”, “second”, etc. in the embodiments of the present invention, the descriptions of “first”, “second”, etc. are only for descriptive purposes and shall not be understood as indications or implications. Its relative importance or implicit indication of the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions in various embodiments can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist. , nor within the protection scope required by the present invention.

The present invention proposes a lens focusing mechanism, which is designed to adjust focusing through mechanical thread rotation, simplify focusing operations, and improve focusing efficiency. It can be understood that the lens focusing mechanism of this embodiment can be applied to many different types of projection modules, such as projection modules in projectors, projection modules in AR equipment, or projection modules in VR equipment, etc. .

In the embodiment of the present invention, as shown in Figure 1, the lens focusing mechanism includes a lens 100, a fixed sleeve 200, a movable sleeve 300 and a transmission assembly (not labeled).

The lens 100 includes a lens barrel 110 and a lens 120 installed in the lens barrel 110;

The fixed sleeve 200 is set on the outside of the lens barrel 110, and the fixed sleeve 200 is provided with external threads;

The movable sleeve 300 is set on the outside of the fixed sleeve 200, the movable sleeve 300 is provided with internal threads, and the movable sleeve 300 is threadedly connected to the fixed sleeve 200;

The transmission assembly drives and connects the movable sleeve 300 and the lens barrel 110;

The movable sleeve 300 can rotate under the action of external force to move axially relative to the fixed sleeve 200 to drive the transmission assembly to drive the lens 100 to move axially.

In this embodiment, the lens barrel 110 plays the role of installing and fixing the lens 120. The lens 120 is installed in the lens barrel 110. When the lens barrel 110 moves axially, it can drive the lens 120 to move axially together to achieve the focus adjustment lens 100. focal length purpose. The fixed sleeve 200 is set on the outside of the lens barrel 110, and the movable sleeve 300 is set on the outside of the fixed sleeve 200. The movable sleeve 300 is provided with internal threads, and the fixed sleeve 200 is provided with external threads. The internal threads and external threads are screwed together to achieve The movable sleeve 300 is threadedly connected to the fixed sleeve 200, so that when the movable sleeve 300 is rotated, it can move axially relative to the fixed sleeve 200. The transmission assembly drives and connects the movable sleeve 300 and the lens barrel 110, so that moving the movable sleeve 300 in the axial direction can drive the lens barrel 110 to move in the axial direction, thereby realizing the function of adjusting the focal length.

It can be understood that when the lens focusing mechanism is used in a projection module, the fixed sleeve 200 is fixedly connected to the optical machine in the projection module, the movable sleeve 300 is threadedly connected to the fixed sleeve 200, and the lens barrel 110 is set in the fixed sleeve 200. , then the movable sleeve 300 and the fixed sleeve 200 can limit the radial position of the lens barrel 100 to achieve the purpose of installing the lens 100 with the optical machine. In actual application, the fixed sleeve 200 is a lens barrel sleeve used to install the lens barrel 110, and the movable sleeve 300 is a nut structure set outside the lens barrel sleeve. Through the thread matching of the nut and the lens barrel sleeve, the user Just by turning the nut (ie, the movable sleeve 300), the lens barrel 110 can be driven to move axially through the transmission assembly, thereby achieving the purpose of focusing.

The specific structure of the transmission assembly can be determined according to the actual situation. Optionally, the transmission assembly can be a limiting rod and an annular groove structure respectively provided on the movable sleeve 300 and the lens barrel 110, so that when the movable sleeve 300 rotates, the lens barrel 110 The function of not moving radially but moving axially. Optionally, the transmission assembly can also be a structure of limiting bosses and connecting parts (elastic parts, etc.) respectively provided on the movable sleeve 300 and the lens barrel 110, and can be limited by two limiting bosses, and can also be connected through the connecting parts. Realize the function of driving the lens barrel 110 to move axially. Alternatively, the transmission assembly can also be a separate driving structure, and the axial movement function of the lens barrel 110 is directly realized through the driving structure.

Optionally, the outer wall of the lens barrel 110 is provided with an axially extending guide rail (not shown), and the inner wall of the fixed sleeve 300 is provided with a slide groove, and the guide rail is slidably matched with the slide groove. Through the cooperation between the guide rail and the slide groove, the relative sliding movement between the lens barrel 110 and the fixed sleeve 300 is made more stable and reliable.

In the lens focusing mechanism of the technical solution of the present invention, the lens 120 is installed in the lens barrel 110. A fixed sleeve 200 is installed outside the lens barrel 110. The fixed sleeve 200 is provided with external threads. A movable sleeve 300 is installed outside the fixed sleeve 200. The movable sleeve 300 is provided with internal threads, the movable sleeve 300 is threadedly connected to the fixed sleeve 200, and a transmission component is drivingly connected between the movable sleeve 300 and the lens barrel 110, so that the movable sleeve 300 can rotate under the action of external force to rotate relative to the fixed sleeve 200. Moving in an axial direction can drive the transmission component to drive the lens 100 to move axially, so as to achieve the effect of adjusting the focal length of the lens 100. In this embodiment, through the threaded connection between the movable sleeve 300 and the fixed sleeve 200, the user can achieve the purpose of focusing by simply rotating the movable sleeve 300, which simplifies the focusing operation and improves the focusing efficiency.

In one embodiment of the present invention, referring to Figure 1, the transmission assembly includes a first limiting part 310, a second limiting part 111 and an elastic member 400; the first limiting part 310 is provided on the movable sleeve 300 The inner wall of the lens barrel 110 is spaced apart from the end of the fixed sleeve 200 to form an installation space; the second limiter 111 is provided on the outer wall of the lens barrel 110 and is located in the installation space. , the second limiting part 111 resists the first limiting part 310; the elastic member 400 is connected between the second limiting part 111 and the fixed sleeve 200.

In this embodiment, the first limiting part 310 is a limiting structure in which the inner wall of the movable sleeve 300 protrudes inward, and the second limiting part 111 is a limiting structure in which the outer wall of the lens barrel 110 protrudes outward. The positioning portion 310 and the second limiting portion 111 are arranged in contact with the side away from the fixed sleeve 200 to achieve a limiting function when the lens barrel 110 moves to the axial target position. The first limiting part 310 is spaced apart from the end of the fixed sleeve 200 to form an installation space. It can be understood that when the movable sleeve 300 rotates relative to the fixed sleeve 200 and undergoes axial displacement, the internal axial direction of the installation space can be changed. stroke size on. An elastic member 400 is provided between the second limiting part 111 and the fixed sleeve 200, so that when the first limiting part 310 moves axially under the action of the movable sleeve 300, the size of the installation space changes. At this time, the second limiting part The portion 111 can move axially under the elastic force of the elastic member 400, thereby driving the lens barrel 110 to move axially to achieve the purpose of focusing.

It can be understood that the first limiting part 310 is located on the side of the second limiting part 111 away from the installation space, so the elastic member 400 is in a compressed state in the initial state. When the movable sleeve 300 is rotated, the first limiting part 310 moves away from the installation space. When the fixed base 200 moves in the direction, it is equivalent to releasing the resistance to the second limiting part 111. At this time, the elastic member 400 resumes its deformation and generates thrust force on the second limiting part 111 to push the second limiting part 111 toward The first limiting part 310 moves until the two resist each other, thereby realizing the movement function of the lens 100 in the direction away from the fixed sleeve 200; when the movable sleeve 300 is rotated to cause the first limiting part 310 to move toward the fixed base 200, the first limiting part 310 moves toward the fixed base 200. The position portion 310 pushes the second limiting portion 111 to move toward the fixed base 200 to realize the movement function of the lens 100 toward the fixed sleeve 200 .

In practical applications, the elastic member 400 may be a compression spring or a spring piece structure. In this embodiment, considering factors such as installation difficulty and process cost, the elastic member 400 uses a compression spring. Alternatively, the compression springs may be multiple evenly distributed within the installation space. Optionally, the compression spring can also be sleeved on the outer periphery of the lens barrel 110 . In this embodiment, considering the convenience of installation, a compression spring is sleeved on the outer periphery of the lens barrel 110, making the lens barrel 110 more stable and reliable during movement.

In one embodiment of the present invention, referring to FIG. 1 , the first limiting part 310 is an annular boss structure protruding inward from the inner wall of the movable sleeve 300 ; and/or the second limiting part 111 It is an annular boss structure protruding outward from the outer wall of the lens barrel 1110 .

It can be understood that the first limiting part 310 is configured as an annular boss structure, which increases the limiting area. The second limiting part 111 is configured as an annular boss structure, which increases the limiting area and also increases the contact area between the second limiting part 111 and the elastic member 400, thereby making the movement of the lens barrel 110 more stable.

In this embodiment, the first limiting part 310 and the second limiting part 111 are both configured as annular boss structures, which increases the resisting area of the first limiting part 310 and the second limiting part 111 so that both The movement is more stable.

In one embodiment of the present invention, referring to FIG. 1 , in the radial direction, the end of the first limiting portion 310 is in contact with the outer wall of the lens barrel 110 ; and/or, in the radial direction, The end of the second limiting portion 111 is in contact with the inner wall of the movable sleeve 300 .

It can be understood that by abutting the end of the first limiting portion 310 with the outer wall of the lens barrel 110 in the radial direction, the mating area of the movable sleeve 300 and the lens barrel 110 is further increased, thereby making the two The connection structure is more reliable.

By abutting the end of the second limiting part 111 with the inner wall of the movable sleeve 300 in the radial direction, the radial limiting effect of the movable sleeve 300 on the lens barrel 110 is ensured, allowing the lens barrel 110 to move axially. more stable.

In one embodiment of the present invention, the transmission assembly includes a limiting boss (not shown) and an annular groove (not shown). The central axis of the annular groove is collinear with the central axis of the lens barrel 110. The limiting boss extends into the annular groove and can slide along the circumferential direction of the annular groove;

One of the limiting boss and the annular groove is provided on the inner wall of the movable sleeve 300 , and the other one is provided on the outer wall of the lens barrel 110 .

It can be understood that a limiting boss is provided on the inner wall of the movable sleeve 300, and an annular groove is provided on the outer wall of the lens barrel 110. The limiting boss extends into the annular groove, so that when the movable sleeve 300 rotates relative to the fixed sleeve 200, When axially displaced, the limiting boss can be driven to rotate in the annular groove, and the lens barrel 110 can be driven to move axially, thereby realizing the focusing function of the lens 100 .

Similarly, an annular groove is provided on the inner wall of the movable sleeve 300, and a limiting boss is provided on the outer wall of the lens barrel 110. The limiting boss extends into the annular groove, so that when the movable sleeve 300 rotates relative to the fixed sleeve 200, During the axial displacement, the annular groove can be driven to rotate relative to the limiting boss. Through the limiting function of the annular groove and the limiting boss in the axial direction, the lens barrel 110 can be driven to move axially, thereby achieving the adjustment of the lens 100. Focus purpose.

The present invention also proposes a projection module. The projection module includes an optical machine and a lens focusing mechanism. The specific structure of the lens focusing mechanism refers to the above-mentioned embodiments. Since this projection module adopts all the technologies of all the above-mentioned embodiments, The solution, therefore, has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described again one by one. The fixed sleeve 200 is fixedly connected to the optical machine; the light emitted by the optical machine is emitted through the lens 120 .

It can be understood that the fixed sleeve 200 is equivalent to the lens barrel sleeve used to install the lens barrel 110. The fixed sleeve 200 is fixedly connected to the optical engine to realize the installation of the lens barrel 110 and the optical engine, and then to realize the installation of the lens 100 and the optical engine. function, thereby ensuring that the light emitted by the optical machine can be emitted through the lens 120 to achieve the purpose of imaging.

The fixed sleeve 200 is provided with an external thread, and a movable sleeve 300 is installed outside the fixed sleeve 200. The movable sleeve 300 is provided with an internal thread (equivalent to a nut). The movable sleeve 300 is threadedly connected to the fixed sleeve 200, and the movable sleeve 300 is connected to the lens barrel 110. There is a transmission component drivingly connected therebetween, so that the movable sleeve 300 can rotate under the action of external force to move axially relative to the fixed sleeve 200, and can drive the transmission component to drive the lens 100 to move axially to achieve the effect of adjusting the focal length of the lens 100. In this embodiment, through the threaded connection between the movable sleeve 300 and the fixed sleeve 200, the user can achieve the purpose of focusing by simply rotating the movable sleeve 300, which simplifies the focusing operation and improves the focusing efficiency.

The present invention also proposes an electronic device. The electronic device includes a projection module. The specific structure of the projection module refers to the above-mentioned embodiments. Since this electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has the characteristics of the above-mentioned embodiments. All the beneficial effects brought by the technical solutions will not be repeated here. Optionally, the electronic device may be an AR device, a VR device, a projector, etc.

The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Under the inventive concept of the present invention, equivalent structural transformations can be made using the contents of the description and drawings of the present invention, or direct/indirect applications. Other related technical fields are included in the patent protection scope of the present invention.

Claims (7)

1. A lens focus adjustment mechanism, comprising:

a lens including a barrel and a lens mounted within the barrel;

the fixing sleeve is sleeved outside the lens barrel and is provided with external threads;

the movable sleeve is sleeved outside the fixed sleeve, the movable sleeve is provided with an internal thread, and the movable sleeve is in threaded connection with the fixed sleeve; and

the transmission assembly is in driving connection with the movable sleeve and the lens cone;

the movable sleeve can rotate under the action of external force to axially move relative to the fixed sleeve so as to drive the transmission assembly to drive the lens to axially move;

the transmission assembly includes:

the first limiting part is arranged on the inner wall of the movable sleeve, and the first limiting part and the end part of the fixed sleeve are arranged at intervals to form an installation space;

the second limiting part is arranged on the outer wall of the lens barrel and positioned in the installation space, and is propped against the first limiting part; and

the elastic piece is a compression spring sleeved on the periphery of the lens barrel, and the compression spring is arranged in the installation space and is connected between the second limiting part and the fixed sleeve;

the outer wall of the lens cone is provided with an axially extending guide rail, the inner wall of the fixing sleeve is provided with a sliding groove, and the guide rail is in sliding fit with the sliding groove.

2. The lens focusing mechanism of claim 1, wherein the first limiting part is an annular boss structure protruding inwards from the inner wall of the movable sleeve;

and/or, the second limiting part is an annular boss structure which is outwards protruded from the outer wall of the lens cone.

3. The lens focusing mechanism according to claim 1, wherein an end of the first stopper abuts against an outer wall of the lens barrel in a radial direction;

and/or, in the radial direction, the end part of the second limiting part is abutted with the inner wall of the movable sleeve.

4. The lens focusing mechanism according to claim 1, wherein the transmission assembly comprises a limit boss and an annular groove, the central axis of the annular groove is collinear with the central axis of the lens barrel, and the limit boss extends into the annular groove and can slide along the circumferential direction of the annular groove;

one of the limit boss and the annular groove is arranged on the inner wall of the movable sleeve, and the other one of the limit boss and the annular groove is arranged on the outer wall of the lens cone.

5. The lens focusing mechanism according to any one of claims 1 to 4, wherein the fixed sleeve is a lens barrel sleeve fixedly connected to the optical machine, and the movable sleeve is a nut sleeved outside the lens barrel sleeve.

6. A projection module comprising a light engine and the lens focusing mechanism according to any one of claims 1 to 5; wherein the fixed sleeve is fixedly connected with the optical machine; light emitted by the optical machine is emitted out through the lens.

7. An electronic device comprising the projection module of claim 6.