Transmission device and pan-tilt camera

Abstract

The invention discloses a transmission device and a pan-tilt camera, and relates to the technical field of camera equipment, the transmission device is applied to the pan-tilt camera, and the transmission device comprises a shell with a mounting cavity; the driving module is arranged on the shell, and the driving module comprises a driver and a driving gear arranged at the output end of the driver; the transmission module comprises a base, a first transmission gear and a second transmission gear, the driving gear, the first transmission gear and the second transmission gear are sequentially arranged in a meshed mode, and part of the first transmission gear and part of the second transmission gear are arranged on the side, away from the driver, of the base in a stacked mode in the second direction; the technical scheme provided by the invention has the technical effects that part of the first transmission gear and part of the second transmission gear are stacked on the side, away from the driver, of the base in the second direction, so that the thickness of the shell is thinner.

Description

Technical Field

[0001] The invention relates to the technical field of camera equipment, and in particular to a transmission device and a pan / tilt camera. Background Art

[0002] The camera gimbal is often used as an installation platform for assembling lens modules. The lens module is driven to rotate through an internal transmission device to adjust the angle of the lens module, thereby making the operation of the lens module more convenient. However, the transmission device in the existing pan-tilt head has a complex structure, which occupies a large space inside the pan-tilt head, thereby making the wall thickness of the pan-tilt head too thick. Summary of the invention

[0003] The main purpose of the present invention is to provide a transmission device and a pan / tilt camera, aiming to reduce the thickness of the shell.

[0004] To achieve the above-mentioned purpose, the transmission device proposed in the present invention is applied to a pan / tilt camera, and the transmission device includes a housing having a mounting cavity; a driving module, disposed in the housing, the driving module comprising a driver and a driving gear disposed at an output end of the driver; and A transmission module, comprising a base, a first transmission gear and a second transmission gear, wherein the base is arranged in the installation cavity, a first installation position and a second installation position are arranged on one side of the base, the first installation position and the second installation position are arranged along a first direction, the first installation position is used for installation of a driver, and the second installation position is used for installation of a lens module, the rotation axes of the driving gear, the first transmission gear and the second transmission gear are arranged along the first direction, the driving gear, the first transmission gear and the second transmission gear are meshed in sequence, a part of the first transmission gear and a part of the second transmission gear are stacked and arranged on a side of the base away from the driver along the second direction, and the second transmission gear is used for transmission connection with the lens module; The driving module is used to drive the driving gear, the first transmission gear and the second transmission gear to rotate, so that the second transmission gear drives the lens module to rotate; The first direction and the second direction intersect.

[0005] In one embodiment, the transmission module also includes a third transmission gear, which is arranged on a side of the base close to the first transmission gear, and the first transmission gear, the third transmission gear and the second transmission gear are meshed in sequence, part of the third transmission gear and part of the first transmission gear are stacked along the second direction, and part of the third transmission gear and part of the second transmission gear are stacked along the second direction.

[0006] In one embodiment, the base has a first mounting wall and a second mounting wall on both sides along the second direction, the first mounting wall is provided with the first mounting position and the second mounting position spaced apart along the first direction, the second mounting wall is provided with a step portion protruding along the second direction, the step portion is provided with a third mounting position for installing the drive gear, and the second mounting wall is provided with a fourth mounting position for installing the first transmission gear and the second transmission gear.

[0007] In one embodiment, the first transmission gear includes a first sub-gear and a first mother gear connected to each other, the first sub-gear and the first mother gear are coaxially arranged, the third transmission gear includes a second sub-gear and a second mother gear connected to each other, the second sub-gear and the second mother gear are coaxially arranged, and the driving gear, the first mother gear, the first sub-gear, the second mother gear, the second sub-gear and the second transmission gear are meshed in sequence.

[0008] In one embodiment, the number of teeth of the driving gear is smaller than the number of teeth of the first mother gear or the number of teeth of the second mother gear, the number of teeth of the first mother gear is greater than the number of teeth of the first sub-gear, the number of teeth of the second mother gear is greater than the number of teeth of the second sub-gear, and the transmission ratio of the driving gear to the transmission module is not less than 30 and not greater than 36.

[0009] In one embodiment, the transmission module also includes a gear shaft, which includes a first connecting section, a second connecting section and a shaft head, wherein two ends of the second connecting section are respectively connected to the first connecting section and the shaft head, and the gear shaft is installed in the base through the first connecting section, and the gear shaft is installed in the first transmission gear or the third transmission gear through the second connecting section.

[0010] In one embodiment, the first connecting segment includes a third connecting segment and a fourth connecting segment, the third connecting segment is located on a side of the fourth connecting segment away from the second connecting segment, and the outer diameter of the third connecting segment is smaller than the outer diameter of the fourth connecting segment; And / or, the second connecting segment has a groove, the groove is extended along the circumference of the second connecting segment, and the groove is used to store lubricant.

[0011] In one embodiment, the transmission device also includes a limit assembly, the limit assembly includes an optical coupling baffle and an optical coupling plate, the optical coupling baffle is arranged on the second transmission gear, the optical coupling plate is arranged on the side of the base close to the second transmission gear, the optical coupling plate is provided with an optical coupling, the optical coupling plate has a first position and a second position for controlling the rotation stroke of the lens assembly, the optical coupler is arranged at the first position, and the optical coupler is used to control the drive to stop when the optical coupling baffle is located at the first position.

[0012] In one embodiment, the driving gear is made of copper, the first transmission gear is made of polyester rubber, and the second transmission gear and the third transmission gear are made of polyester rubber or polyoxymethylene.

[0013] The present invention further proposes a pan-tilt camera, comprising a lens module and the transmission device as described in the above embodiment, wherein the lens module comprises a camera head and a transmission shaft connected to each other, and the transmission shaft is in transmission connection with the second transmission gear.

[0014] The technical solution of the present invention forms a multi-stage transmission module by adopting a driving gear, a first transmission gear and a second transmission gear, arranges the driver and the lens assembly to be installed on one side of the base, and arranges part of the first transmission gear and part of the second transmission gear to be stacked along the second direction on the side of the base away from the driver, thereby improving the utilization rate of the space in the installation cavity and making the thickness of the shell thinner. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A partial structural schematic diagram of an embodiment of a transmission device provided by the present invention; Figure 2 A schematic diagram of the exploded structure of an embodiment of a transmission device provided by the present invention; Figure 3 A structural side view of an embodiment of a transmission device provided by the present invention; Figure 4 for Figure 3 Structural cross-sectional view along AA direction; Figure 5 A schematic structural diagram of a base at an angle in an embodiment of a transmission device provided by the present invention; Figure 6 A schematic structural diagram of a base at another angle in an embodiment of a transmission device provided by the present invention; Figure 7 This is a schematic diagram of the structure of a gear shaft in an embodiment of a transmission device provided by the present invention.

[0017] Description of Figure Numbers: 1. Shell; 11. Mounting cavity; 2. Drive module; 21. Driver; 22. Drive gear; 3. Transmission module; 31. Base; 311. First mounting wall; 3111. First mounting position; 3112. Second mounting position; 312. Second mounting wall; 3121. Step portion; 3122. Third mounting position; 3123. Fourth mounting position; 32. First transmission gear; 321. First sub-gear; 322. First mother gear; 33. First Second transmission gear; 34, third transmission gear; 341, second sub-gear; 342, second mother gear; 35, gear shaft; 351, first connecting section; 3511, third connecting section; 3512, fourth connecting section; 352, second connecting section; 3521, groove; 353, shaft head; 4, limit assembly; 41, optical coupling baffle; 42, optical coupling plate; 421, optical coupling; 422, first position; 423, second position; 5, lens module.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] The invention provides a transmission device.

[0023] See also Figure 1 and Figure 2 In one embodiment of the present invention, the transmission device is applied to a pan-tilt camera, and the transmission device includes a housing 1, a drive module 2 and a transmission module 3; the housing 1 has a mounting cavity 11; the drive module 2 is arranged in the housing 1, the drive module 2 includes a driver 21 and a drive gear 22 arranged at the output end of the driver 21; and the transmission module 3 includes a base 31, a first transmission gear 32 and a second transmission gear 33, the base 31 is arranged in the mounting cavity 11, and a first mounting position 3111 and a second mounting position 3112 are provided on one side of the base 31, the first mounting position 3111 and the second mounting position 3112 are arranged along a first direction, the first mounting position 3111 is used for installing the driver 21, and the second mounting position 3112 is used for For installation of the lens module 5, the rotation axes of the driving gear 22, the first transmission gear 32 and the second transmission gear 33 are arranged along the first direction, the driving gear 22, the first transmission gear 32 and the second transmission gear 33 are meshed in sequence, part of the first transmission gear 32 and part of the second transmission gear 33 are stacked along the second direction on the side of the base 31 away from the driver 21, and the second transmission gear 33 is used for transmission connection with the lens module 5; the driving module 2 is used to drive the driving gear 22, the first transmission gear 32 and the second transmission gear 33 to rotate, so that the second transmission gear 33 drives the lens module 5 to rotate; wherein, the first direction and the second direction intersect.

[0024] The technical solution of the present invention forms a multi-stage transmission module 3 by adopting a driving gear 22, a first transmission gear 32 and a second transmission gear 33, and arranges the driver 21 and the lens assembly to be installed on one side of the base 31, and arranges part of the first transmission gear 32 and part of the second transmission gear 33 to be stacked along the second direction on the side of the base 31 away from the driver 21, thereby improving the utilization rate of the space in the installation cavity 11, thereby making the thickness of the shell 1 thinner.

[0025] In this embodiment, the first direction may be consistent with the up-down direction, and the second direction may be consistent with the front-back direction. The housing 1 may be set as the housing 1 of the pan / tilt head, and the housing 1 is used to install the drive module 2 and the transmission module 3, thereby improving the stability of the rotation of the driver 21, the drive gear 22, the first transmission gear 32 and the second transmission gear 33. The driver 21 may be set as a driver 21 such as an electric motor or a motor, and the driver 21 may serve as a power source for the entire transmission device, thereby providing power for the rotation of the lens module 5. By setting the drive gear 22 on the output shaft of the driver 21, it is convenient for the driver 21 to transmit power to the transmission module 3 through the drive gear 22. A first mounting position 3111 and a second mounting position 3112 may be provided on one side of the base 31 away from the first transmission gear 32 and the second transmission gear 33. The first mounting position 3111 and the second mounting position 3112 may be arranged at intervals along the first direction. The driver 21 and the lens module 5 are respectively installed at the first mounting position 3111 and the second mounting position 3112. The driving gear 22, the first transmission gear 32 and the second transmission gear 33 are installed on the other side of the base 31. The arrangement of the driver 21, the driving gear 22, the first transmission gear 32 and the second transmission gear 33 in the space required for the shell 1 is reduced, thereby reducing the thickness of the shell 1 along the second direction, making the shell 1 more beautiful. By arranging the first installation position 3111 below the second installation position 3112, and arranging the rotation axes of the driving gear 22, the first transmission gear 32, and the second transmission gear 33 along the first direction and from the first installation position 3111 toward the second installation position 3112, the space for arranging the driver 21, the lens module 5, the first transmission gear 32, and the second transmission gear 33 in the installation cavity 11 is reduced. The driving gear 22 is meshed with a portion of the first transmission gear 32, and a portion of the first transmission gear 32 is meshed with the second transmission gear 33, and a portion of the first transmission gear 32 and a portion of the second transmission gear 33 are stacked along the second direction. The present application arranges the positions of the first transmission gear 32 and the second transmission gear 33 on the base 31 to form a transmission module 3 with a large transmission ratio. When the driver 21 can adopt a smaller driver 21, the lens module 5 can be driven to rotate by the transmission module 3 with a large transmission ratio, thereby further reducing the space required for the driver 21, the driving gear 22, the first transmission gear 32 and the second transmission gear 33 to be arranged in the shell 1, thereby further reducing the thickness of the shell 1 along the second direction, thereby making the shell 1 more beautiful.

[0026] like Figure 2 , Figure 3 and Figure 4As shown, the transmission module 3 also includes a third transmission gear 34, and the third transmission gear 34 is arranged on a side of the base 31 close to the first transmission gear 32. The first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 are meshed in sequence, and part of the third transmission gear 34 and part of the first transmission gear 32 are stacked along the second direction, and part of the third transmission gear 34 and part of the second transmission gear 33 are stacked along the second direction.

[0027] In this embodiment, a transmission module 3 with a large transmission ratio having a three-stage gear transmission is formed by providing a first transmission gear 32, a third transmission gear 34, and a second transmission gear 33. On the premise of being able to drive the lens module 5 to rotate to adjust the angle, the power demand and size requirements of the driver 21 are further reduced, thereby further reducing the internal space of the installation cavity 11 occupied by the driver 21, thereby further reducing the thickness of the housing 1. The first transmission gear 32, the third transmission gear 34, and the second transmission gear 33 are stacked in sequence along the second direction toward one side of the second installation position 3112, thereby reducing the internal space of the installation cavity 11 occupied by the first transmission gear 32, the third transmission gear 34, and the second transmission gear 33, thereby reducing the thickness of the housing 1.

[0028] like Figure 5 and Figure 6 As shown, the base 31 has a first mounting wall 311 and a second mounting wall 312 on both sides along the second direction, the first mounting wall 311 is provided with the first mounting position 3111 and the second mounting position 3112 spaced apart along the first direction, the second mounting wall 312 is provided with a step portion 3121 protruding along the second direction, the step portion 3121 is provided with a third mounting position 3122 for installing the driving gear 22, and the second mounting wall 312 is provided with a fourth mounting position 3123 for installing the first transmission gear 32 and the second transmission gear 33.

[0029] In this embodiment, in order to improve the utilization rate of the internal space of the housing 1, the first mounting wall 311 and the second mounting wall 312 are provided on both sides of the base 31 along the second direction, and the first mounting wall 311 is provided with a first mounting position 3111 and a second mounting position 3112 at intervals along the first direction. The driver 21 and the lens module 5 are arranged on one side of the base 31 along the second direction, so that the driving gear 22, the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 are arranged on the other side of the base 31. The second mounting wall 312 is provided with a step portion 3121 protruding along the second direction, so that a height difference is formed between the step portion 3121 and the second mounting wall 312 along the second direction, so that it is more convenient for the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 to be stacked in sequence from the step portion 3121 toward the second mounting position 3112, thereby reducing the space occupied by the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 stacked in the second direction in the mounting cavity 11. The step portion 3121 is provided with a third installation position 3122 for installing the driving gear 22, and the second installation wall 312 is provided with a fourth installation position 3123 for installing the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33, thereby facilitating the installation of the driving gear 22, the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33, thereby improving the rotation stability of the driving gear 22, the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33. The step portion 3121 is located on the side of the base 31 away from the driver 21, and a first installation position 3111 for installing the driver 21 is formed between the step portion 3121 and the base 31 to reduce the space occupied by the driver 21 in the installation cavity 11.

[0030] like Figure 4 As shown, the first transmission gear 32 includes a first sub-gear 321 and a first mother gear 322 connected to each other, and the first sub-gear 321 and the first mother gear 322 are coaxially arranged. The third transmission gear 34 includes a second sub-gear 341 and a second mother gear 342 connected to each other, and the second sub-gear 341 and the second mother gear 342 are coaxially arranged. The driving gear 22, the first mother gear 322, the first sub-gear 321, the second mother gear 342, the second sub-gear 341 and the second transmission gear 33 are meshed in sequence.

[0031] In this embodiment, by adopting the coaxial arrangement of the first sub-gear 321 and the first mother gear 322, the number of teeth of the first sub-gear 321 can be smaller than the number of teeth of the first mother gear 322, and by adopting the coaxial arrangement of the second sub-gear 341 and the second mother gear 342, the number of teeth of the second sub-gear 341 can be smaller than the number of teeth of the second mother gear 342. The second mother gear 342 and the first mother gear 322 partially overlap when stacked in the second direction, and the second mother gear 342 and the second transmission gear 33 partially overlap when stacked in the second direction, thereby making it more convenient to stack the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 in the second direction, thereby reducing the space occupied by the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 when stacked in the second direction.

[0032] like Figure 2 As shown, the number of teeth of the driving gear 22 is smaller than the number of teeth of the first mother gear 322 or the number of teeth of the second mother gear 342, the number of teeth of the first mother gear 322 is greater than the number of teeth of the first sub-gear 321, the number of teeth of the second mother gear 342 is greater than the number of teeth of the second sub-gear 341, and the transmission ratio of the driving gear 22 to the transmission module 3 is not less than 30 and not greater than 36.

[0033] In this embodiment, the transmission ratio between the driving gear 22 and the transmission module 3 is set to be not less than 30 and not more than 36. In this range, according to the size of the transmission ratio between the driving gear 22 and the transmission module 3, the size of the driver 21 can be more accurately defined, thereby matching the corresponding power output. At the same time, it can avoid the situation where the power provided by the driver 21 cannot drive the lens module 5 to rotate, thereby affecting the use of the lens module 5 to adjust the angle.

[0034] In this embodiment, the transmission ratio between the driving gear 22 and the transmission module 3 can be set to 33.3, under the premise of driving the lens module 5 to rotate, thereby reducing the space occupied by the installation cavity 11 due to the size of the driver 21.

[0035] like Figure 2 and Figure 7 As shown, the transmission module 3 also includes a gear shaft 35, and the gear shaft 35 includes a first connecting section 351, a second connecting section 352 and a shaft head 353, and the two ends of the second connecting section 352 are respectively connected to the first connecting section 351 and the shaft head 353, and the gear shaft 35 is installed in the base 31 through the first connecting section 351, and the gear shaft 35 is installed in the first transmission gear 32 or the third transmission gear 34 through the second connecting section 352.

[0036] In this embodiment, the gear shaft 35 can assemble the first transmission gear 32 or the third transmission gear 34 to the base 31 by means of a riveting process, thereby improving the stability of the rotation of the first transmission gear 32 or the third transmission gear 34. An annular groove for assembling a retaining spring is provided between the shaft head 353 and the second connecting section 352, and the gear shaft 35 is assembled to the first transmission gear 32 or the third transmission gear 34 through the retaining spring structure, thereby replacing the existing gear shaft 35 assembled to the transmission gear by screws, thereby improving the stability of the first transmission gear 32 or the third transmission gear 34 assembled to the base 31.

[0037] like Figure 7 As shown, the first connecting section 351 includes a third connecting section 3511 and a fourth connecting section 3512, the third connecting section 3511 is located on a side of the fourth connecting section 3512 away from the second connecting section 352, and the outer diameter of the third connecting section 3511 is smaller than the outer diameter of the fourth connecting section 3512; And / or, the second connecting segment 352 has a groove 3521, and the groove 3521 is extended along the circumference of the second connecting segment 352, and the groove 3521 is used to store lubricant.

[0038] In this embodiment, the base 31 may have a plurality of assembly holes (not shown) for assembling the gear shaft 35 on the fourth mounting position 3123. The outer diameter of the third connecting segment 3511 may be smaller than the outer diameter of the fourth connecting segment 3512. The outer diameter of the fourth connecting segment 3512 is set to be consistent with the outer diameter of the assembly hole, so that the third connecting segment 3511 is used as a positioning segment, thereby making it easier to press the gear shaft 35 into the assembly hole. The gear shaft 35 is provided with a groove 3521 on the second connecting segment 352, so that the lubricant can be temporarily stored in the groove 3521, thereby making the first transmission gear 32 or the second transmission gear 33 rotate more smoothly.

[0039] like Figure 3 As shown, the transmission device also includes a limit assembly 4, and the limit assembly 4 includes an optical coupling baffle 41 and an optical coupling plate 42. The optical coupling baffle 41 is arranged on the second transmission gear 33, and the optical coupling plate 42 is arranged on the side of the base 31 close to the second transmission gear 33. The optical coupling plate 42 is provided with an optical coupler 421, and the optical coupling plate 42 has a first position 422 and a second position 423 for controlling the rotation stroke of the lens assembly. The optical coupler 421 is arranged at the first position 422, and the optical coupler 421 is used to control the driver 21 to stop when the optical coupling baffle 41 is located at the first position 422.

[0040] In this embodiment, the transmission device also includes a control system electrically connected to the optical coupler 421 and the driver 21. The shape of the optical coupling plate 42 can be set to be an arc shape, so as to better adapt to the arc shape of the motion trajectory of the optical coupling baffle 41. When the lens module 5 is placed horizontally, it starts to rotate under the drive of the driver 21 and the transmission module 3, and the optical coupling baffle 41 moves to the optical coupler 421 under the drive of the second transmission gear 33. The optical coupler 421 feeds back a first signal to the control system. The control system controls the driver 21 to stop rotating according to the first signal, and the lens module 5 just rotates to positive 90 degrees. The driver 21 is controlled by the control system to rotate in the opposite direction to drive the lens module 5 to rotate in the opposite direction by 180 degrees. The control system controls the driver 21 to stop rotating so that the lens module 5 rotates to negative 90 degrees. By adopting the mutual cooperation of the control system, the optical coupling baffle 41, the optical coupler 421 and the driver 21, the angular difference between the first position 422 and the second position 423 along the circumferential direction of the optical coupling plate 42 can be set to 180 degrees, which corresponds to the rotation stroke of the lens module 5 of positive and negative 90 degrees, so as to improve the accuracy of switching the lens assembly between positive 90 degrees and negative 90 degrees.

[0041] In this embodiment, the driving gear 22 is made of copper, the first transmission gear 32 is made of polyester rubber, and the second transmission gear 33 and the third transmission gear 34 are made of polyester rubber or polyoxymethylene.

[0042] In the present embodiment, the driving gear 22 is made of copper material, which has the characteristics of high precision and wear resistance, so that it is more suitable for the driver 21 to drive the driving gear 22 to rotate at high speed for a long time, thereby improving the service life of the driving gear 22. The first transmission gear 32 is made of polyester rubber material, which has the characteristics of wear resistance, high toughness and self-lubrication, so that the meshing of the first transmission gear 32 and the driving gear 22 realizes the contact of two soft and hard materials, thereby reducing the noise problem of the driving gear 22 driving the first transmission gear 32 to rotate synchronously at high speed. The first transmission gear 32 made of polyester rubber has high toughness, which can reduce the gap between the first transmission gear 32 and the third transmission gear 34, so that the first transmission gear 32 and the third transmission gear 34 are assembled in a slightly interference fit manner, thereby greatly reducing the transmission virtual position problem between the first transmission gear 32 and the third transmission gear 34, thereby improving the accuracy of the lens module 5 rotating to a preset angle. The second transmission gear 33 and the third transmission gear 34 made of polyester rubber have high toughness, which can reduce the gap between the second transmission gear 33 and the third transmission gear 34, so that the second transmission gear 33 and the third transmission gear 34 are assembled in a slightly interference fit manner, thereby greatly reducing the transmission virtual position problem between the second transmission gear 33 and the third transmission gear 34, thereby improving the accuracy of the lens module 5 rotating to a preset angle. The second transmission gear 33 and the third transmission gear 34 made of polyoxymethylene have high wear resistance, self-lubricating property and thermal deformation temperature, thereby improving the service life of the second transmission gear 33 and the third transmission gear 34.

[0043] The present invention also proposes a pan-tilt camera, which includes a lens module 5 and a transmission device. The specific structure of the transmission device refers to the above embodiment. Since the pan-tilt camera adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The lens module 5 includes a camera and a transmission shaft connected to each other, and the transmission shaft is in transmission connection with the second transmission gear 33.

[0044] In this embodiment, the working principle of the pan-tilt camera is as follows: the driver 21 rotates to drive the driving gear 22 to rotate, the driving gear 22 drives the first transmission gear 32, the third transmission gear 34 and the second transmission gear 33 to rotate in turn, the second transmission gear 33 drives the transmission shaft to rotate, so that the transmission shaft drives the camera to rotate.

[0045] In this embodiment, the lens module 5 also includes a mounting seat for installing a transmission shaft, and a first bone position (not shown) is protruding from one side of the mounting seat close to the transmission device, and a second bone position (not shown) is protruding from both sides of the base 31 close to the second mounting position 3112, and the second bone position is located below the first bone position. The two second bone positions cooperate with the first bone position to form two mechanical limit points. When the optical coupler 421 is damaged, the lens module 5 rotates relative to the transmission device until the first bone position abuts against one of the second bone positions, so that the first bone position and the second bone position limit the lens module 5 from continuing to rotate, so as to prevent the lens module 5 from rotating too much and damaging other components.

[0046] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transmission device, applied to a pan / tilt camera, characterized in that: The transmission device comprises: A housing having a mounting cavity; a driving module, disposed in the housing, the driving module comprising a driver and a driving gear disposed at an output end of the driver; and A transmission module, comprising a base, a first transmission gear and a second transmission gear, wherein the base is arranged in the installation cavity, a first installation position and a second installation position are arranged on one side of the base, the first installation position and the second installation position are arranged along a first direction, the first installation position is used for installation of a driver, and the second installation position is used for installation of a lens module, the rotation axes of the driving gear, the first transmission gear and the second transmission gear are arranged along the first direction, the driving gear, the first transmission gear and the second transmission gear are meshed in sequence, a part of the first transmission gear and a part of the second transmission gear are stacked and arranged on a side of the base away from the driver along the second direction, and the second transmission gear is used for transmission connection with the lens module; The driving module is used to drive the driving gear, the first transmission gear and the second transmission gear to rotate, so that the second transmission gear drives the lens module to rotate; Wherein, the first direction and the second direction intersect.

2. The transmission device according to claim 1, characterized in that: The transmission module also includes a third transmission gear, which is arranged on a side of the base close to the first transmission gear. The first transmission gear, the third transmission gear and the second transmission gear are meshed in sequence, part of the third transmission gear and part of the first transmission gear are stacked along the second direction, and part of the third transmission gear and part of the second transmission gear are stacked along the second direction.

3. The transmission device according to claim 2, characterized in that: The base has a first mounting wall and a second mounting wall on both sides along the second direction, the first mounting wall is provided with the first mounting position and the second mounting position spaced apart along the first direction, the second mounting wall is provided with a step portion protruding along the second direction, the step portion is provided with a third mounting position for installing the drive gear, and the second mounting wall is provided with a fourth mounting position for installing the first transmission gear and the second transmission gear.

4. The transmission device according to claim 2, characterized in that: The first transmission gear includes a first sub-gear and a first mother gear connected to each other, and the first sub-gear and the first mother gear are coaxially arranged. The third transmission gear includes a second sub-gear and a second mother gear connected to each other, and the second sub-gear and the second mother gear are coaxially arranged. The driving gear, the first mother gear, the first sub-gear, the second mother gear, the second sub-gear and the second transmission gear are meshed in sequence.

5. The transmission device according to claim 4, characterized in that: The number of teeth of the driving gear is smaller than the number of teeth of the first mother gear or the second mother gear, the number of teeth of the first mother gear is greater than the number of teeth of the first sub-gear, the number of teeth of the second mother gear is greater than the number of teeth of the second sub-gear, and the transmission ratio of the driving gear to the transmission module is not less than 30 and not greater than 36.

6. The transmission device according to claim 2, characterized in that: The transmission module also includes a gear shaft, which includes a first connecting section, a second connecting section and a shaft head, wherein two ends of the second connecting section are respectively connected to the first connecting section and the shaft head, and the gear shaft is installed in the base through the first connecting section, and the gear shaft is installed in the first transmission gear or the third transmission gear through the second connecting section.

7. The transmission device according to claim 6, characterized in that: The first connecting section includes a third connecting section and a fourth connecting section, the third connecting section is located on a side of the fourth connecting section away from the second connecting section, and the outer diameter of the third connecting section is smaller than the outer diameter of the fourth connecting section; And / or, the second connecting segment has a groove, the groove is extended along the circumference of the second connecting segment, and the groove is used to store lubricant.

8. The transmission device according to claim 2, characterized in that: The transmission device also includes a limit assembly, which includes an optical coupling baffle and an optical coupling plate. The optical coupling baffle is arranged on the second transmission gear, and the optical coupling plate is arranged on a side of the base close to the second transmission gear. The optical coupling plate is provided with an optical coupling, and the optical coupling plate has a first position and a second position for controlling the rotation stroke of the lens assembly. The optical coupling is arranged at the first position, and the optical coupling is used to control the driver to stop when the optical coupling baffle is located at the first position.

9. The transmission device according to any one of claims 2 to 8, characterized in that: The driving gear is made of copper, the first transmission gear is made of polyester rubber, and the second transmission gear and the third transmission gear are made of polyester rubber or polyoxymethylene.

10. A pan / tilt camera, characterized in that: It comprises a lens module and a transmission device as described in any one of claims 1 to 9, wherein the lens module comprises a camera and a transmission shaft connected to each other, and the transmission shaft is in transmission connection with the second transmission gear.

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