A rotation angle detection structure of a lens group cam barrel and a lens assembly

Abstract

The utility model relates to a kind of rotation angle detection structure of lens group cam cylinder and lens assembly, it includes: first rack, its connection lens group's focusing cam cylinder outer peripheral surface;First motor, its first rotation output shaft is connected with the first motor gear engaged with first rack;First encoder, it has the first encoder gear engaged with the first rack, for obtaining the rotation angle of focusing cam cylinder;Second rack, it connects the outer peripheral surface of zoom cam cylinder of lens group;Second motor, its second rotation output shaft is connected with the second motor gear engaged with second rack;And, second encoder, it has the second encoder gear engaged with the second rack, for obtaining the rotation angle of zoom cam cylinder.The application can be completed by encoder to focusing cam cylinder, zoom cam cylinder rotation angle detection, and by encoder on encoder gear and rack direct engagement transmission, to greatly reduce structure volume and weight, improve user experience.

Description

Technical Field

[0001] This utility model relates to the field of imaging equipment technology, and in particular to a rotation angle detection structure for a lens assembly cam cylinder and a lens assembly. Background Technology

[0002] Currently, in the use of imaging equipment, zooming and focusing are usually achieved by rotating the corresponding lens components. For example, the lens group is driven to move linearly by rotating the cam cylinder to complete zoom or focus control.

[0003] In the above process, in order to obtain good imaging quality, it is necessary to obtain the rotation angle of the cam cylinder so as to control the zoom or focus accuracy according to the rotation angle. The commonly used structure is to set a rotation angle detection component on the periphery of the cam cylinder. For example, in the patent application with application number 202122224873.9 and patent name "adjustable lens", a curve grating main scale and a reading head are set on the periphery of the sleeve. The rotation angle of the sleeve is obtained by reading the angle value on the curve grating main scale through the reading head.

[0004] However, the above structural design, due to the setting of the curve grating main scale and reading head, results in the excessive size and weight of the entire lens assembly, leading to a poor customer experience. At the same time, it can only obtain the rotation angle of one sleeve to meet the control requirements for zoom, but it cannot be used in imaging devices that have both zoom and focusing structures, thus limiting its application scenarios. Utility Model Content

[0005] The purpose of this invention is to provide a rotation angle detection structure for a lens cam cylinder and a lens assembly. It can detect the rotation angle of the focusing cam cylinder and the zoom cam cylinder through an encoder, and transmit power through direct meshing of the encoder gear and rack on the encoder, thereby significantly reducing the structural volume and weight and improving the user experience.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] On the one hand, a rotation angle detection structure for a mirror assembly cam cylinder is provided, which includes:

[0008] The first rack connects to the outer peripheral surface of the focusing cam cylinder of the lens assembly;

[0009] The first motor has a first motor gear connected to its first rotating output shaft that meshes with the first rack.

[0010] A first encoder having a first encoder gear meshing with the first rack for acquiring the rotation angle of the focusing cam cylinder;

[0011] The second rack connects to the outer circumferential surface of the zoom cam cylinder of the lens assembly;

[0012] The second motor has a second motor gear connected to its second rotational output shaft that meshes with the second rack.

[0013] And a second encoder having a second encoder gear meshing with the second rack for obtaining the rotation angle of the zoom cam cylinder.

[0014] Preferably, the central axes of the first rotary output shaft and the second rotary output shaft are parallel to each other.

[0015] Preferably, the central axes of both the first and second rotating output shafts are parallel to the optical axis.

[0016] Preferably, the rotation angle detection structure further includes:

[0017] A first mounting base is connected to the end face of the focusing cam cylinder away from the zoom cam cylinder and has multiple first mounting positions for mounting a first motor and / or a first encoder.

[0018] Preferably, the rotation angle detection structure further includes:

[0019] The second mounting base connects to the end face of the zoom cam cylinder away from the focusing cam cylinder and has multiple second mounting positions for mounting the second motor and / or the second encoder.

[0020] On the other hand, a lens assembly is also provided, which includes the above-mentioned rotation angle detection structure, a focusing cam cylinder, a zoom cam cylinder, a focusing lens group disposed in the focusing cam cylinder, a zoom lens group disposed in the zoom cam cylinder, and a lens disposed at the end of the zoom cam cylinder away from the focusing cam cylinder.

[0021] Preferably, the focusing cam cylinder and the zoom cam cylinder of the lens assembly are coaxially arranged.

[0022] In summary, this utility model has the following advantages compared with the prior art:

[0023] The rotation angle detection structure in this invention uses an encoder with higher detection accuracy to detect the rotation angle of the focusing cam cylinder and the zoom cam cylinder, so as to achieve precise adjustment of focusing and zooming according to the rotation angle. At the same time, the encoder gear and rack on the encoder directly mesh and drive, eliminating the need for a gearbox and motor, thereby greatly reducing the size and weight of the structure and improving the user experience. Attached Figure Description

[0024] Fig. 1 This is an overall structural diagram of the rotation angle detection structure in this utility model from a first perspective.

[0025] Fig. 2This is an overall structural diagram of the rotation angle detection structure in this utility model from a second perspective. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] like Figs. 1-2 As shown, this embodiment provides a rotation angle detection structure for a mirror assembly cam cylinder, which includes:

[0029] The first rack 1 is connected to the outer peripheral surface of the focusing cam cylinder 100 of the lens assembly;

[0030] The first motor 2 has a first rotating output shaft, and a first motor gear 21 is connected to the first rotating output shaft, and the first motor gear 21 meshes with the first rack 1;

[0031] The first encoder 3 has a first encoder gear 31 that meshes with the first rack 1;

[0032] The second rack 4 is connected to the outer peripheral surface of the zoom cam cylinder 200 of the lens assembly;

[0033] The second motor 5 has a second rotating output shaft, and a second motor gear 51 is connected to the second rotating output shaft. The second motor gear 51 meshes with the second rack 4.

[0034] The second encoder 6 has a second encoder gear 61 that meshes with the second rack 4;

[0035] When the first rotation output shaft of the first motor 2 rotates, the focusing cam cylinder 100 is driven to rotate through the meshing transmission between the first motor gear 21 and the first rack 1, and the first encoder 3 is driven to rotate synchronously with the focusing cam cylinder 100 through the meshing transmission between the first encoder gear 31 and the first rack 1, so as to obtain the rotation angle of the focusing cam cylinder 100 according to the first encoder 3.

[0036] When the second rotation output shaft of the second motor 5 rotates, the zoom cam cylinder 200 is driven to rotate through the meshing transmission between the second motor gear 51 and the second rack 4, and the second encoder 6 is driven to rotate synchronously with the zoom cam cylinder 200 through the meshing transmission between the second encoder gear 61 and the second rack 4, so as to obtain the rotation angle of the zoom cam cylinder 200 according to the second encoder 6.

[0037] Furthermore, in this embodiment, the focusing cam cylinder 100 and the zoom cam cylinder 200 of the lens assembly are coaxially arranged, and the central axis of the focusing cam cylinder 100 and the zoom cam cylinder 200 coincides with the optical axis. When the focusing cam cylinder 100 rotates, the rotation of the focusing cam cylinder 100 is converted into the linear motion of the focusing lens assembly through the focusing cam cylinder arc-shaped guide groove 101 opened on the outer peripheral surface of the focusing cam cylinder 100 and the focusing cam cylinder guide screw moving along the focusing cam cylinder arc-shaped guide groove 101, so as to achieve focusing.

[0038] When the zoom cam cylinder 200 rotates, the rotation of the zoom cam cylinder 200 is converted into the linear motion of the zoom lens assembly through the zoom cam cylinder arc-shaped guide groove 201 opened on the outer peripheral surface of the zoom cam cylinder 200 and the zoom cam cylinder guide screw moving along the zoom cam cylinder arc-shaped guide groove 201, so as to achieve zoom.

[0039] The technical solution of driving the linear motion of the corresponding lens group by rotating the focusing cam cylinder 100 and the zoom cam cylinder 200 is the prior art, such as 201821847819.1 - a cam cylinder assembly for an optical zoom lens, 202110004877.8 - an electrically controlled optical zoom system, etc., which will not be elaborated further.

[0040] Furthermore, the central axes of the first rotary output shaft and the second rotary output shaft are parallel to each other, and both of their central axes are parallel to the central axes of the focusing cam cylinder 100 and the zoom cam cylinder 200.

[0041] Meanwhile, the first encoder 3 and the second encoder 6 can be one or more of the following: absolute encoder, incremental encoder, magnetic encoder, and photoelectric encoder.

[0042] Therefore, the rotation angle detection structure in this embodiment can simultaneously detect the rotation angles of the focusing cam cylinder and the zoom cam cylinder, so as to achieve precise adjustment of focusing and zooming according to the rotation angle. At the same time, the structure of this embodiment is simple in design. It uses an encoder with higher detection accuracy to replace the grating ruler and the reading head used in the prior art. The encoder gear and rack on the encoder directly mesh and drive, eliminating the need for a gearbox and motor, thereby greatly reducing the size and weight of the structure and improving the user experience.

[0043] Example 2:

[0044] The only difference between this embodiment and Embodiment 1 is that the rotation angle detection structure further includes:

[0045] The first mounting base 7 is connected to the end face of the focusing cam cylinder 100 away from the zoom cam cylinder 200, and has multiple first mounting positions 71, and the first motor 2 and / or the first encoder 3 are respectively connected to the first mounting positions 71 at different positions.

[0046] The second mounting base 8 is connected to the end face of the zoom cam cylinder 200 away from the focusing cam cylinder 100, and has multiple second mounting positions 81, with the second motor 5 and / or the second encoder 6 respectively connected to the second mounting positions 81 at different positions.

[0047] Therefore, in this embodiment, the motor and encoder can be installed in different positions to adapt to the structural design requirements of different products, ensuring that the cam cylinder can be driven to rotate normally and the rotation angle of the cam cylinder can be obtained while avoiding position interference.

[0048] Example 3:

[0049] This embodiment provides a lens assembly, which includes the rotation angle detection structure described in embodiment 1 or 2, a focusing cam cylinder 100, a zoom cam cylinder 200, a focusing lens group disposed in the focusing cam cylinder 100, a zoom lens group disposed in the zoom cam cylinder 200, and a lens 300 disposed at the end of the zoom cam cylinder 200 away from the focusing cam cylinder 100.

[0050] In summary, the rotation angle detection structure in this application uses an encoder with higher detection accuracy to replace the grating ruler and the reading head used in the prior art. It can simultaneously detect the rotation angle of the focusing cam cylinder and the zoom cam cylinder, so as to achieve precise adjustment of focusing and zooming according to the rotation angle. At the same time, the structure of this application has a simple design. It directly meshes the encoder gear and rack on the encoder, eliminating the need for a gearbox and motor, thereby greatly reducing the size and weight of the structure and improving the user experience.

[0051] Furthermore, by setting up mounting bases, the motor and encoder can be adjusted to different mounting positions to adapt to the structural design requirements of different products and avoid positional interference.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for detecting the rotation angle of a mirror assembly cam cylinder, characterized in that, include: The first rack connects to the outer peripheral surface of the focusing cam cylinder of the lens assembly; The first motor has a first motor gear connected to its first rotating output shaft that meshes with the first rack. A first encoder having a first encoder gear meshing with the first rack for acquiring the rotation angle of the focusing cam cylinder; The second rack connects to the outer circumferential surface of the zoom cam cylinder of the lens assembly; The second motor has a second motor gear connected to its second rotational output shaft that meshes with the second rack. And a second encoder having a second encoder gear meshing with the second rack for obtaining the rotation angle of the zoom cam cylinder.

2. The rotation angle detection structure as described in claim 1, characterized in that, The central axes of the first and second rotary output shafts are parallel to each other.

3. The rotation angle detection structure as described in claim 1, characterized in that, The central axes of both the first and second rotating output shafts are parallel to the optical axis.

4. The rotation angle detection structure as described in claim 1, characterized in that, The rotation angle detection structure further includes: A first mounting base is connected to the end face of the focusing cam cylinder away from the zoom cam cylinder and has multiple first mounting positions for mounting a first motor and / or a first encoder.

5. The rotation angle detection structure as described in claim 1, characterized in that, The rotation angle detection structure further includes: The second mounting base connects to the end face of the zoom cam cylinder away from the focusing cam cylinder and has multiple second mounting positions for mounting the second motor and / or the second encoder.

6. A lens assembly, characterized in that, It includes the rotation angle detection structure as described in any one of claims 1-5, a focusing cam cylinder, a zoom cam cylinder, a focusing lens group disposed in the focusing cam cylinder, a zoom lens group disposed in the zoom cam cylinder, and a lens disposed at the end of the zoom cam cylinder away from the focusing cam cylinder.

7. The lens assembly as claimed in claim 6, characterized in that, The focusing cam cylinder and the zoom cam cylinder of the lens assembly are coaxially arranged.

Images