Lens driving structure

Abstract

The utility model relates to the field of optical element mounting mechanisms, in particular to a lens driving structure. Comprising a lens barrel, a zoom group is arranged in the lens barrel, a first driving device is arranged on the lens barrel, the first driving device is used for driving the zoom group, and the first driving device is arranged in the moving direction of the zoom group; the lens cone is provided with a position sensor, the first driving device is controlled by the position sensor, and the position sensor is arranged along the moving direction of the zoom group. Through the arrangement of the first driving device and the position sensor, more optical groups do not need to be arranged, the zooming speed of the zooming group can be greatly increased, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the field of optical element installation mechanisms, in particular to a lens driving structure. Background Art

[0002] A true zoom lens, also called a parfocal lens, is one that maintains focus as the focal length changes. Most consumer zoom lenses cannot maintain perfect focus but are still parfocal in design. The convenience of variable focal length comes at the cost of complexity—and some compromises in image quality, weight, size, aperture, autofocus performance, and cost.

[0003] The driving element that drives the zoom group in the zoom lens will directly determine the zoom speed of the zoom lens. The currently commonly used large-magnification zoom lenses have a long travel, so the zoom lenses are usually slow when zooming. It is difficult for users to control the zoom lens at a specific angle for a long time, and the user experience is poor. Utility Model Content

[0004] The utility model will solve the existing technical problems and provide a lens driving structure. By setting a first driving device and a position sensor, there is no need to set more optical groups, which can greatly speed up the zoom speed of the zoom group and enhance the user experience.

[0005] The technical solution provided by the utility model is as follows:

[0006] A lens driving structure comprises a lens barrel, a zoom group is arranged in the lens barrel, a first driving device is arranged on the lens barrel, the first driving device is used to drive the zoom group, and the first driving device is arranged along the moving direction of the zoom group;

[0007] The lens barrel is provided with a position sensor, the first driving device is controlled by the position sensor, and the position sensor is arranged along the moving direction of the zoom group.

[0008] In the technical solution, by providing the first driving device and the position sensor, it is not necessary to provide more optical groups, which can greatly speed up the zoom speed of the zoom group and enhance the user experience.

[0009] Preferably, an aperture is further provided in the lens barrel, the zoom group and the position sensor are arranged on both sides of the lens barrel, and the aperture extends outwardly along the radial direction of the lens barrel.

[0010] In this technical solution, the possibility of aperture extension is achieved through the position limitation of the zoom group and the position sensor, thereby achieving the effect of a large aperture of the lens.

[0011] Preferably, a moving group and a second driving device are further provided in the lens barrel, the main optical axis of the moving group is collinear with the main optical axis of the zoom group, and the second driving device is used to drive the moving group;

[0012] The moving distance of the zoom group is greater than that of the moving group.

[0013] In this technical solution, in this embodiment, by moving the group and the second driving device, multiple groups in the lens are linked, thereby increasing the zoom effect of the lens.

[0014] When the ratio of the moving distance of the zoom group to the moving distance of the moving group is less than a first preset parameter, the second driving device is a linear ultrasonic motor.

[0015] The focus time of the mobile group is substantially similar to the zoom time of the zoom group. The user can freely set the second preset parameter according to the response speed requirements of the customer, which can also reduce costs to a certain extent.

[0016] Preferably, when the moving distance of the moving group is less than a second preset parameter, the second driving device is a stepping motor.

[0017] In the technical solution, the type of the second driving device is limited by the restriction of the second preset parameter, thereby controlling the cost to a certain extent.

[0018] Preferably, the second driving device and the moving group are provided in plurality, and the second driving devices of adjacent moving groups are provided on both sides of the lens barrel.

[0019] In this technical solution, by limiting the position of the second driving device, the possibility of interference between adjacent second driving devices is reduced, the miniaturization of the lens is achieved, the parallelism of multiple second driving devices when driven is increased, and the reliability of the movement of the moving group is increased.

[0020] Preferably, the position sensor is not coplanar with the second driving device and the first driving device.

[0021] In the technical solution, by setting the position sensor, the possibility of interference between the position sensor and the second driving device and the first driving device is reduced, thereby achieving miniaturization of the lens.

[0022] Preferably, the position sensor is a GMR sensor or an MR sensor or an AMR sensor or a TMR sensor.

[0023] Preferably, the first driving device is a linear ultrasonic motor.

[0024] Compared with the prior art, the lens driving structure provided by the utility model has the following beneficial effects:

[0025] 1. By setting the first driving device and the position sensor, there is no need to set more optical groups, which can greatly speed up the zoom speed of the zoom group and enhance the user experience.

[0026] 2. The focus time of the mobile group is basically close to the zoom time of the zoom group. The user can freely set the second preset parameter according to the customer's response speed requirements, which can also reduce costs to a certain extent.

[0027] 3. By limiting the position of the second driving device, the possibility of interference between adjacent second driving devices is reduced, miniaturization of the lens is achieved, and the parallelism of multiple second driving devices when driving is increased, thereby increasing the reliability of the movement of the mobile group. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of a lens driving structure.

[0029] Figure 1 This is a structural schematic diagram of a lens driving structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the internal structure of a lens driving structure of the utility model;

[0031] Figure 3 It is a structural schematic diagram of another lens driving structure of the utility model;

[0032] Figure 4 This is a structural schematic diagram of another lens driving structure of the utility model;

[0033] Description of the accompanying drawings: 1. Lens barrel; 2. Zoom group; 3. First driving device; 4. Position sensor; 5. Aperture; 6. Moving group; 7. Second driving device. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, a lens driving structure comprises a lens barrel 1, wherein a zoom group 2 is arranged in the lens barrel 1, and the zoom group 2 can move along the main optical axis direction of the lens, that is, the zoom group 2 can move left and right, and a first driving device 3 is arranged on the lens barrel 1, wherein the first driving device 3 is used to drive the zoom group 2, and the first driving device 3 is arranged along the moving direction of the zoom group 2.

[0038] The lens barrel 1 is provided with a position sensor 4 , and the first driving device 3 is controlled by the position sensor 4 . The position sensor 4 is arranged along the moving direction of the zoom group 2 . Specifically, the position sensor 4 can sense the position of the zoom group 2 and send a position signal of the zoom group 2 to the first driving device 3 .

[0039] Specifically, in this embodiment, the position sensor 4 is a GMR sensor or an MR sensor or an AMR sensor or a TMR sensor, and the first driving device 3 is a linear ultrasonic motor. Therefore, for the zoom group 2 during the zooming process of the large-magnification zoom lens, the linear ultrasonic motor can achieve rapid zooming.

[0040] In this embodiment, by disposing the first driving device 3 and the position sensor 4, it is not necessary to dispose more optical groups, which can greatly speed up the zoom speed of the zoom group 2 and improve the user experience.

[0041] An aperture 5 is also provided in the lens barrel 1, and the zoom group 2 and the position sensor 4 are arranged on both sides of the lens barrel 1. The aperture 5 extends outward along the radial direction of the lens barrel 1. Specifically, the zoom group 2 and the position sensor 4 are respectively arranged on the upper and lower sides of the lens barrel 1. In the current state, the blades of the aperture 5 can extend to both sides of the lens barrel 1 and are elliptical, thereby achieving the effect of a large aperture 5.

[0042] In this embodiment, the possibility of extending the aperture 5 is realized by limiting the position of the zoom group 2 and the position sensor 4, thereby achieving the effect of a large aperture 5 of the lens.

[0043] The lens barrel 1 is further provided with a moving group 6 and a second driving device 7, the main optical axis of the moving group 6 is collinear with the main optical axis of the zoom group 2, and the second driving device 7 is used to drive the moving group 6;

[0044] The moving distance of the zoom group 2 is greater than that of the moving group 6 .

[0045] Specifically, in this embodiment, the moving group 6 is arranged on the right side of the zoom group 2. The moving group 6 is the focus group of the lens, and the moving distance of the moving group 6 is smaller than that of the zoom group 2. Therefore, a relatively low-priced stepper motor can be used to realize the movement of the moving group 6.

[0046] In this embodiment, the multi-group linkage in the lens is realized by moving the group 6 and the second driving device 7, thereby increasing the zoom effect of the lens.

[0047] Preferably, when the moving distance of the mobile group 6 is less than the second preset parameter, the second driving device 7 is a stepping motor. Specifically, if the focusing speed of the mobile group 6 for the lens is within 0.8s, the driving speed of the stepping motor for the mobile group 6 is about 16mm / s, so the first preset parameter can be set to 14mm, that is, when the moving distance of the mobile group is less than 14mm, when the second driving device 7 is a stepping motor, the focusing of the mobile group 6 can be completed within the time required by the customer.

[0048] In this embodiment, the type of the second driving device 7 is limited by the restriction of the second preset parameter, thereby controlling the cost to a certain extent.

[0049] Example 2

[0050] like Figure 2 , Figure 3 and Figure 4 As shown, on the basis of Example 1, in this embodiment, the second driving device 7 and the moving group 6 are provided in plurality, and the second driving devices 7 of adjacent moving groups 6 are provided on both sides of the lens barrel 1 .

[0051] That is, when there are multiple second driving devices 7, the multiple second driving devices 7 are respectively arranged on the upper and lower sides of the lens barrel 1; in this embodiment, by limiting the position of the second driving devices 7, the possibility of interference between adjacent second driving devices 7 is reduced, the miniaturization of the lens is achieved, and the parallelism of the multiple second driving devices 7 when driven is increased, thereby increasing the reliability of the movement of the moving group 6.

[0052] Preferably, when the ratio of the moving distance of the zoom group 2 to the moving distance of the moving group 6 is smaller than a first preset parameter, the second driving device 7 is a linear ultrasonic motor.

[0053] Specifically, in the present embodiment, the driving speed of the stepper motor for the moving group 6 is about 16 mm / s, and the driving speed of the linear ultrasonic motor is about 200 mm / s. If the moving distance of the zoom group 2 is 50 mm, and the moving distance of the moving group 6 is 12 mm, the zoom time of the zoom group 2 is 0.25 s, and the focusing time of the moving group 6 is 0.75 s. It is difficult to meet the requirements of customers with higher requirements on the response speed. Therefore, selecting the second driving device 7 as a linear ultrasonic motor can increase the focusing speed of the moving group 6.

[0054] In this embodiment, the ratio of the moving distance of zoom group 2 to the moving distance of zoom group 6 is 4, so the focusing time of zoom group 6 is much longer than the zooming time of zoom group 2.

[0055] When the ratio of the moving distance of zoom group 2 to the moving distance of moving group 6 is 10, that is, if the moving distance of zoom group 2 is 80 mm, the moving distance of moving group 6 is 8 mm, the zoom time of zoom group 2 is 0.4 s, and the focus time of moving group 6 is 0.5 s, the focus time of moving group 6 is basically close to the zoom time of zoom group 2, and the user can freely set the second preset parameter according to the customer's response speed requirements. For example, setting the second preset parameter to 6 can speed up the response speed of the lens to a certain extent and reduce the cost to a certain extent.

[0056] The position sensor 4 is not coplanar with the second driving device 7 and the first driving device 3 .

[0057] That is, in this embodiment, the second driving device 7 and the first driving device 3 are respectively arranged on the upper and lower sides of the lens barrel 1, so the position sensor 4 is arranged on the front and rear sides of the lens barrel 1; in this embodiment, through the arrangement of the position sensor 4, the possibility of interference between the position sensor 4 and the second driving device 7 and the first driving device 3 is reduced, thereby realizing the miniaturization of the lens.

[0058] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A lens driving structure, characterized in that: It comprises a lens barrel, a zoom group is arranged in the lens barrel, a first driving device is arranged on the lens barrel, the first driving device is used to drive the zoom group, and the first driving device is arranged along the moving direction of the zoom group; The lens barrel is provided with a position sensor, the first driving device is controlled by the position sensor, and the position sensor is arranged along the moving direction of the zoom group.

2. A lens driving structure according to claim 1, characterized in that: An aperture is also arranged in the lens barrel, the zoom group and the position sensor are arranged on both sides of the lens barrel, and the aperture extends outwardly along the radial direction of the lens barrel.

3. The lens driving structure according to claim 1, characterized in that: A moving group and a second driving device are also provided in the lens barrel, the main optical axis of the moving group is collinear with the main optical axis of the zoom group, and the second driving device is used to drive the moving group; The moving distance of the zoom group is greater than that of the moving group.

4. The lens driving structure according to claim 3, characterized in that: When the ratio of the moving distance of the zoom group to the moving distance of the moving group is less than a first preset parameter, the second driving device is a linear ultrasonic motor.

5. The lens driving structure according to claim 3, characterized in that: When the moving distance of the moving group is less than a second preset parameter, the second driving device is a stepping motor.

6. The lens driving structure according to claim 3, characterized in that: The second driving device and the moving group are arranged in plurality, and the second driving devices of adjacent moving groups are arranged on both sides of the lens barrel.

7. The lens driving structure according to claim 6, characterized in that: The position sensor is not coplanar with the second driving device and the first driving device.

8. The lens driving structure according to claim 1, characterized in that: The position sensor is a GMR sensor, an MR sensor, an AMR sensor, or a TMR sensor.

9. The lens driving structure according to claim 1, characterized in that: The first driving device is a linear ultrasonic motor.

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