Focusing mechanism and focusing device

Abstract

The present application provides a focusing mechanism for driving a focusing module to move up and down, comprising a base, a driving assembly and a grating sensor. The driving assembly is connected to the base, and the driving assembly comprises a linear motor and a cylinder, the cylinder is used to support the focusing module, and the linear motor is used to drive the focusing module to move. The grating sensor is electrically connected to the linear motor, and is used to monitor and feedback the position of the focusing module driven by the linear motor in real time. The present application improves the accuracy of the linear motor driving the focusing module to move, and at the same time, reduces the heat generated by the linear motor and the heat transferred to the focusing module, further improving the focusing accuracy of the focusing module. The present application also provides a focusing device.

Description

Technical Field

[0001] The present application relates to the technical field of camera focusing, and in particular to a focusing mechanism and a focusing device. Background Art

[0002] As cameras in electronic devices become increasingly miniaturized, existing cameras are becoming thinner and thinner. Consequently, the distance required for back-focus adjustment is shrinking, placing increasing demands on the precision of focus adjustment in existing devices. Currently, most focusing mechanisms utilize ball screws driven by servo motors. However, due to the gap between the ball screw and the nut during machining and assembly, as well as the limited machining and assembly precision of the ball screw, achieving the required precision is difficult. Summary of the Invention

[0003] In view of this, the present application provides a focusing mechanism to solve the above problems.

[0004] The present application also provides a focusing device.

[0005] A focusing mechanism, used to drive a focusing module up and down, comprises a base, a drive assembly, and a grating sensor. The drive assembly is connected to the base and includes a linear motor and a cylinder. The cylinder supports the focusing module, and the linear motor drives the focusing module. The grating sensor is electrically connected to the linear motor and monitors and provides real-time feedback on the position of the focusing module driven by the linear motor.

[0006] In some embodiments, the grating sensor includes a grating scale and a grating reading head electrically connected to the grating scale, the grating scale is arranged on the base, and the length direction of the grating scale is consistent with the movement direction of the focusing module, and the grating reading head is used to read the relative position of the moving focusing module and the grating scale.

[0007] In some embodiments, the cylinder is further connected to a gas pressure regulating component, which includes a gas reservoir and a pressure regulating valve for controlling the gas pressure in the cylinder, and the pressure regulating valve is connected between the gas reservoir and the cylinder.

[0008] In some embodiments, the air pressure regulating component further includes an air filter connected between the air cylinder and the pressure regulating valve.

[0009] In some embodiments, the air pressure regulating member further includes a pressure sensor connected to the air cylinder.

[0010] In some embodiments, the base includes a base, a support frame and a top plate arranged on the support frame, the support frame is arranged on the base, the top plate is used to connect the focusing module, the cylinder is fixedly connected to the top plate, and the piston rod of the cylinder extends out of the top plate and is used to support the focusing module.

[0011] In some embodiments, the linear motor is disposed on the support frame, and a transmission plate is fixedly connected to the linear motor. The transmission plate is arranged along the direction from the base to the top plate, and one end of the transmission plate extends out of the top plate for being fixed to the focusing module.

[0012] In some embodiments, the linear motor is an ironless linear motor.

[0013] The present application also provides a focusing device, including a focusing module and the focusing mechanism. The focusing module includes a supporting plate and a sliding member connected to the supporting plate. The supporting plate is fixedly connected to the linear motor and the cylinder respectively. The sliding member is arranged on the surface of the supporting plate facing the base, and the support frame is provided with a sliding rail that is slidably connected to the sliding member.

[0014] In some embodiments, two sliding members are provided, and the two sliding members are respectively arranged on both sides of the supporting plate, and two corresponding sets of sliding rails are provided on the supporting frame.

[0015] In the present application, the movement distance of the focusing module can be precisely controlled through the cooperation of the linear motor and the grating sensor, thereby improving the focusing accuracy of the focusing module; by connecting the focusing module to the cylinder, the cylinder provides a force to support the focusing module, so that during the operation of the linear motor, no force is provided to support the focusing module's own gravity, thereby reducing the working output power of the linear motor, reducing the heat generated by the linear motor, further reducing the transfer of heat to the focusing module, and improving the focusing accuracy of the focusing module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a focusing device provided in an embodiment of the present application.

[0017] Figure 2 yes Figure 1 A partial exploded view of a focusing device in one embodiment is shown.

[0018] Figure 3 yes Figure 1 The figure shows a cross-sectional view of the focusing device along line III-III in one embodiment.

[0019] Figure 4 yes Figure 1 A schematic diagram of the connection between the cylinder and the air pressure regulating member in one embodiment is shown.

[0020] Figure 5 yes Figure 1 An exploded view of a sliding member in a focusing device according to an embodiment is shown.

[0021] Description of main component symbols

[0022] Focusing mechanism 100

[0023] Base 10

[0024] Base 11

[0025] Support frame 12

[0026] First Board 121

[0027] Second board 122

[0028] Third Board 123

[0029] Slide 124

[0030] Accommodating cavity 125

[0031] Top plate 13

[0032] First through hole 131

[0033] Second through hole 132

[0034] Drive assembly 20

[0035] Linear motor 21

[0036] Cylinder 22

[0037] Piston rod 221

[0038] Transmission plate 23

[0039] Grating sensor 30

[0040] Linear ruler 31

[0041] Grating reading head 32

[0042] Air pressure regulator 40

[0043] Gas cylinder 41

[0044] Air filter 42

[0045] Pressure regulating valve 43

[0046] Pressure sensor 44

[0047] Gas source 45

[0048] Focusing device 200

[0049] Focusing module 210

[0050] Carrying plate 211

[0051] Sliding member 212

[0052] Fixed plate 2121

[0053] Slider 2122

[0054] Reinforcement plate 2123

[0055] The following specific implementation methods will be combined with the above-mentioned Figure 1-5 Further explain this application. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0057] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. When an element is referred to as being "disposed on" another element, it may be directly disposed on the other element or there may be an intermediate element.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0059] In order to further illustrate the technical means and effects adopted by this application to achieve the intended purpose, the following detailed description of this application is made in conjunction with the accompanying drawings and implementation methods.

[0060] See also Figure 1 、 Figure 2 and Figure 3, an embodiment of the present application provides a focusing mechanism 100 for driving a focusing module 210 in a focusing device 200 to move up and down. The focusing module 210 is used to project the best clear point of the lens module (not shown) onto the photosensitive element to ensure the normal use of the lens module, the best field of view, and a clearer displayed image. The focusing mechanism 100 includes a base 10, a driving assembly 20, and a grating sensor 30. The driving assembly 20 is arranged on the base 10. The driving assembly 20 includes a linear motor 21 and a cylinder 22. The linear motor 21 and the cylinder 22 are both connected to the focusing module 210. The linear motor 21 drives the focusing module 210 to move, and the cylinder 22 supports the focusing module 210. The movement directions of the linear motor 21 and the cylinder 22 are consistent. The grating sensor 30 is arranged on the base 10 and is electrically connected to the linear motor 21. It is used to monitor in real time and provide timely feedback on the position of the focusing module 210 driven by the linear motor 21.

[0061] See Figure 1 and Figure 2 In some embodiments, the base 10 includes a base 11, a support frame 12, and a top plate 13 disposed on the support frame 12. The support frame 12 includes a first plate 121, a second plate 122, and a third plate 123. The second plate 122 is disposed between the first plate 121 and the third plate 123. The top plate 13 is fixedly disposed on the first plate 121, the second plate 122, and the third plate 123. The base 10, the first plate 121, the second plate 122, the third plate 123, and the top plate 13 collectively form a receiving chamber 125 having an opening. The cylinder 22 and the linear motor 21 are both disposed within the receiving chamber 125 and spaced apart. The focusing module 210 is disposed on the top plate 13.

[0062] See Figure 2 and Figure 3 In some embodiments, the linear motor 21 is mounted on the third plate 123, and a transmission plate 23 is fixedly connected to the linear motor 21. The transmission plate 23 can be fixed to the linear motor 21 by bolts and moves linearly along the base 11 to the top plate 13 with the linear motor 21. The top plate 13 has a first through-hole 131, through which the transmission plate 23 passes and is fixedly connected to the focusing module 210. The linear motor 21 drives the transmission plate 23 to move up and down, thereby driving the focusing module 210 to move up and down.

[0063] See Figure 2The grating sensor 30 includes a grating ruler 31 and a grating reading head 32. The grating ruler 31 is fixed on the surface of the first plate 121 away from the accommodating cavity 125. The length direction of the grating ruler 31 is set along the direction from the base 11 to the top plate 13. The length direction of the grating ruler 31 is consistent with the moving direction of the focusing module 210. The grating reading head 32 is set on the focusing module 210 and is fixedly connected to the focusing module 210. The grating reading head 32 moves with the movement of the focusing module 210 and reads the distance moved by the focusing module 210. Therefore, the cooperation between the grating reading head 32 and the grating ruler 31 can accurately determine the distance that the linear motor 21 drives the focusing module 210 to move, so that the focusing accuracy of the focusing module 210 reaches the nanometer level.

[0064] See Figure 2 and Figure 3 In some embodiments, the cylinder 22 is fixed to the top plate 13, which has a second through hole 132 defined therein. The piston rod 221 of the cylinder 22 passes through the second through hole 132 and is fixedly connected to the focusing module 210. During the movement of the focusing module 210, the cylinder 22 always supports the focusing module 210 and provides a force equal to the weight of the focusing module 210 itself. This allows the linear motor 21 to drive the focusing module 210 into a near-zero-load motion, further reducing the output power of the linear motor 21, thereby reducing the heat generated by the linear motor 21 and the heat transferred to the focusing module 210 via the transmission plate 23, thereby further improving the focusing accuracy of the focusing module 210.

[0065] See Figure 3 and Figure 4 In some embodiments, the air cylinder 22 is further connected to a pressure regulating member 40 for adjusting the pressure within the air cylinder 22 so that the supporting force provided by the air cylinder 22 is always balanced with the weight of the focusing module 210 and the total weight of lens modules of varying weights (not shown) placed on the focusing module 210. The air pressure regulating member 40 includes an air reservoir 41, an air filter 42, a pressure regulating valve 43, and a pressure sensor 44. The pressure sensor 44 is connected to the air cylinder 22 and is used to detect and provide feedback on the pressure within the air cylinder 22. This facilitates adjusting the amount of gas within the air cylinder 22 via the pressure regulating valve 43 to change the pressure within the air cylinder 22 and, in turn, adjust the force provided by the air cylinder 22. The air reservoir 41, air filter 42, and pressure regulating valve 43 are connected in sequence. Furthermore, one end of the air reservoir 41 is connected to an air source 45. The air filter 42 filters the air flowing from the air reservoir 41 into the cylinder 22 to protect the accuracy of the pressure regulating valve 43 and prevent impurities in the air from clogging or affecting the sensitivity of the pressure regulating valve 43. In some embodiments, the pressure regulating valve 43 is a precision pressure regulating valve 43.

[0066] See Figure 3 and Figure 4 When a lens module of a different weight (not shown) is replaced on the focusing module 210, the total weight of the focusing module 210 and the lens module changes. By adjusting the size of the pressure regulating valve 43, the pressure in the cylinder 22 can be changed, thereby changing the pressure of the cylinder 22 so that the force provided by the cylinder 22 offsets the total weight of the focusing module 210 and the lens module to be focused. This prevents the linear motor 21 from providing a force to offset the gravity of the focusing module 210 when it is moving the focusing module 210 up and down or when it is stationary, thereby reducing the heat generated by the linear motor 21 and improving the focusing accuracy of the focusing module 210. The combination of the air pressure regulating member 40 and the cylinder 22 can be applied to lens modules of different weights. At the same time, the cylinder 22 always provides support for the focusing module 210, which can prevent the linear motor 21 from stopping working and causing the focusing module 210 to move freely under the action of gravity when the power is cut off or the linear motor 21 is operated incorrectly. The setting of the cylinder 22 improves the safety of the focusing module 210 and the lens module.

[0067] See Figure 2 and Figure 3 In some embodiments, both the base 10 and the top plate 13 are made of aluminum alloy. Aluminum alloy is easy to conduct heat and can easily transfer the heat generated by the motor to the focusing module 210, affecting the focusing accuracy of the focusing module 210. In the existing technology, in order to reduce the heat exposure of the focusing module 210, air cooling with heat sink fins, water cooling with water circuits, or the use of metal materials with good heat dissipation are adopted. In this embodiment, by combining the linear motor 21 with the cylinder 22, the setting of the heat dissipation device is reduced, thereby saving production costs. In some embodiments, the linear motor 21 is a coreless linear motor 21. The coreless linear motor 21 has a large heat dissipation area, which can reduce the heat transferred to the focusing module 210.

[0068] See Figure 1 and Figure 5The present application also provides a focusing device 200, which includes a focusing module 210 and a focusing mechanism 100. The focusing module 210 is arranged on the focusing mechanism 100, and the linear motor 21 drives the focusing module 210 to move up and down. The focusing module 210 includes a carrier plate 211 and a sliding member 212 connected to the carrier plate 211. The carrier plate 211 is arranged on the top plate 13, and the transmission plate 23 and the piston rod 221 of the cylinder 22 are both fixedly connected to the carrier plate 211. The sliding member 212 is arranged on the side of the carrier plate 211. In order to ensure more stable movement of the focusing module 210, in some embodiments, two sliding members 212 are provided and are respectively located on both sides of the carrier plate 211. The sliding member 212 includes a fixed plate 2121 and a slider 2122 connected to the fixed plate 2121. The grating reading head 32 is fixed on the fixed plate 2121. Both the first plate 121 and the third plate 123 are provided with slide rails 124 for sliding engagement with the slider 212. The fixed plate 2121 is fixedly and perpendicularly connected to the carrier plate 211, and the slider 2122 is slidably connected to the slide rails 124. A reinforcing plate 2123 is also provided between the fixed plate 2121 and the carrier plate 211. This triangular structure is fixedly connected to the fixed plate 2121 and the carrier plate 211 on the same surface, thereby enhancing the stability of the connection between the carrier plate 211 and the fixed plate 2121.

[0069] In the present application, the moving distance of the focusing module 210 can be precisely controlled through the cooperation of the linear motor 21 and the grating sensor 30, thereby improving the focusing accuracy of the focusing module 210; by connecting the focusing module 210 to the cylinder 22, the cylinder 22 provides a force to support the focusing module 210, so that during the operation of the linear motor 21, the force of the focusing module 210's own gravity is not provided, thereby reducing the working output power of the linear motor 21, reducing the heat generated by the linear motor 21, further reducing the transfer of heat to the focusing module 210, and improving the focusing accuracy of the focusing module 210.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A focusing mechanism for driving a focusing module to move up and down, characterized in that: The focusing mechanism comprises: base; a drive assembly connected to the base, the drive assembly comprising a linear motor and a cylinder, the cylinder being used to support the focusing module, the linear motor being used to drive the focusing module to move, the cylinder always supporting the focusing module during movement, and the force provided by the cylinder offsetting the total weight of the focusing module and the lens module requiring focusing; The grating sensor is electrically connected to the linear motor and is used for real-time monitoring and feedback of the position of the focusing module driven by the linear motor.

2. The focusing mechanism according to claim 1, wherein: The grating sensor includes a grating scale and a grating reading head electrically connected to the grating scale. The grating scale is arranged on the base, and the length direction of the grating scale is consistent with the movement direction of the focusing module. The grating reading head is used to read the relative position of the moving focusing module and the grating scale.

3. The focusing mechanism according to claim 1, wherein: The cylinder is also connected to a gas pressure regulating component, which includes a gas reservoir and a pressure regulating valve for controlling the gas pressure in the cylinder. The pressure regulating valve is connected between the gas reservoir and the cylinder.

4. The focusing mechanism according to claim 3, wherein: The air pressure regulating component further includes an air filter, which is connected between the air storage cylinder and the pressure regulating valve.

5. The focusing mechanism according to claim 4, wherein: The air pressure regulating component further includes a pressure sensor connected to the air cylinder.

6. The focusing mechanism according to claim 1, wherein: The base includes a base, a support frame and a top plate arranged on the support frame, the support frame is arranged on the base, the top plate is used to connect the focusing module, the cylinder is fixedly connected to the top plate, and the piston rod of the cylinder extends out of the top plate and is used to support the focusing module.

7. The focusing mechanism according to claim 6, wherein: The linear motor is arranged on the support frame, and a transmission plate is fixedly connected to the linear motor. The transmission plate is arranged along the direction from the base to the top plate, and one end of the transmission plate extends out of the top plate for being fixed to the focusing module.

8. The focusing mechanism according to claim 1, wherein: The linear motor is a coreless linear motor.

9. A focusing device, comprising a focusing module, characterized in that: It also includes a focusing mechanism as described in any one of claims 1 to 8, wherein the focusing module includes a supporting plate and a sliding member connected to the supporting plate, the supporting plate is fixedly connected to the linear motor and the cylinder respectively, the sliding member is arranged on the surface of the supporting plate facing the base, and the base is provided with a sliding rail slidably connected to the sliding member.

10. The focusing device according to claim 9, wherein There are two sliding members, which are respectively arranged on both sides of the carrying plate. The base includes a support frame, and the support frame is provided with two corresponding sets of slide rails.

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