Lens automatic focus control device and shooting equipment

Abstract

The utility model discloses an automatic focus control device for a lens. The automatic focus control device for the lens comprises a shell, a driving assembly, a UWB module and a control module, the driving assembly is connected with the shell and used for adjusting the lens focus; the UWB module comprises a signal transmitter and a signal receiver, the signal transmitter is placed on a shot object, the signal receiver is connected with the shell, or the signal receiver is placed on the shot object, and the signal transmitter is connected with the shell; the control module is electrically connected with the driving assembly and the signal receiver and controls the driving assembly to work according to data fed back by the signal receiver, and automatic focus control of the lens is achieved. According to the technical scheme of the utility model, the distance between the shot object and the lens is calculated by measuring the time point of the signal from the signal transmitter to the signal receiver, and then the control module calculates the appropriate focal length according to the distance data and controls the driving assembly to adjust the focal point of the lens, thereby realizing automatic focus control. In addition, the utility model also discloses shooting equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of photographic equipment, in particular to an automatic focus control device for a lens and photographing equipment. Background Art

[0002] Cameras, video cameras, surveillance cameras and other shooting equipment are widely used tools for recording and disseminating images in modern society. In order to meet different shooting needs, shooting equipment can usually replace different lenses to adapt to different scenes and purposes. In order to facilitate the photographer to adjust the parameters of the lens, the shooting equipment usually has functions such as automatic focus and auto-focus, that is, by sensing the distance and position of the shooting object, the lens focus and auto-focus are adjusted to keep the shooting object clear and stable.

[0003] At present, there are two main technologies for realizing automatic focusing and tracking of lenses. One is the focusing and tracking technology based on image analysis, which determines whether the optimal focus is achieved by analyzing the clarity, contrast, edges and other features of the captured image; the other is the focusing and tracking technology based on ranging, which measures the distance of the photographed object by emitting and receiving infrared, laser, sound waves and other signals, and then adjusts according to the distance.

[0004] However, most of the above-mentioned automatic focus and tracking functions are built-in to the shooting equipment, which means that some different models of original lenses or third-party lenses do not support automatic focus and tracking functions, which requires the photographer to manually operate the lens to follow the focus and focus operations, increasing the difficulty and complexity of shooting. On the other hand, in some scenes, such as stadiums, stages, and shooting equipment at high positions, manual control of focus and tracking is very difficult and complicated. Utility Model Content

[0005] The main purpose of the utility model is to provide a lens automatic focus device, aiming to solve the problem that some original lenses of different models or third-party lenses do not support automatic focus and focusing functions.

[0006] To achieve the above object, the utility model provides an automatic focus follow device for a lens, the automatic focus follow device for a lens comprising:

[0007] case;

[0008] A driving assembly connected to the housing and used to adjust the focus of the lens;

[0009] The UWB module comprises a signal transmitter and a signal receiver, wherein the signal transmitter is placed on the photographed object and the signal receiver is connected to the housing, or the signal receiver is placed on the photographed object and the signal transmitter is connected to the housing;

[0010] The control module is arranged in the housing and is data-connected with the driving component and the signal receiver. The control module is used to control the driving component to work according to the data fed back by the signal receiver to realize automatic focus control of the lens.

[0011] In some embodiments, the signal receiver is detachably connected to the shell. When the signal receiver is detached from the shell, the signal receiver can be data-connected to the control module via a data cable or wirelessly.

[0012] In some embodiments, a data interface is disposed on the shell, the UWB module further comprises a mounting plate connected to the top of the shell, and the signal receiver is disposed on the mounting plate and exposed outside the shell.

[0013] In some embodiments, the signal receiver is electrically connected to the control module via a data line; or,

[0014] The mounting plate is provided with a first terminal electrically connected to the control module, the UWB is provided with a second terminal adapted to the first terminal, and when the signal receiver is mounted on the housing, the first terminal is electrically connected to the second terminal.

[0015] In some embodiments, the lens automatic focus control device includes a plurality of the signal transmitters, and the plurality of the signal transmitters are paired with the same signal receiver.

[0016] In some embodiments, the signal receiver includes multiple signal frequency bands, and the multiple signal frequency bands are respectively matched with multiple signal transmitters. The signal receiver switches the position information of different signal transmitters to the control module so that the driving component drives the lens to switch the focus target.

[0017] In some embodiments, a plug-in slot is configured on the top of the shell, and the signal receiver is plugged into the plug-in slot and electrically connected to the control module.

[0018] In some embodiments, a rotating shaft is configured on one side surface of the housing and is spaced apart from the data interface;

[0019] The drive assembly comprises:

[0020] A driving member, disposed in the housing and spaced apart from the control module;

[0021] The transmission member is rotatably disposed on the rotating shaft, the transmission member is in transmission connection with the output shaft of the driving member, and the transmission member is used to drive the lens to rotate.

[0022] In some embodiments, the automatic focus control device for a lens further includes:

[0023] A mounting bracket, one end of which is used to connect to the protective frame;

[0024] A movable fastener is configured at the bottom of the shell, and the movable fastener is detachably connected to the other end of the mounting bracket.

[0025] The utility model further provides a photographing device, comprising a lens and the aforementioned lens automatic focus control device;

[0026] A rack, the rack being detachably wound around the peripheral wall of the lens;

[0027] Host;

[0028] A protection frame is connected to the host, and the signal receiver is installed on the top of the shell and the protection frame.

[0029] The technical solution of the utility model connects a signal receiver to a shell, sets a drive component at an interval, and places a signal transmitter on the photographed object; by measuring the time point when the wireless signal arrives from the signal transmitter to the signal receiver, the distance between the photographed object and the lens is calculated, and then the control module calculates the appropriate focal length according to the distance data, and controls the drive component to adjust the focus of the lens, thereby realizing automatic focus control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the assembly of the automatic focus follow device and the lens in one embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the structure of an automatic focus device for a lens in one embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the electrical connection of a module in one embodiment of the utility model;

[0033] Figure 4 This is a schematic structural diagram of an automatic focus follow device for a lens in another embodiment of the present utility model;

[0034] Figure 5 This is a schematic diagram of the structure of an automatic focus device for a lens in one embodiment of the utility model;

[0035] Figure 6 This is a structural schematic diagram of an automatic focus follow device for a lens in another embodiment of the utility model;

[0036] Figure 7 This is a structural schematic diagram of an automatic focus follow device for a lens in yet another embodiment of the present utility model;

[0037] Figure 8The figure is a schematic structural diagram of an automatic focus follow device for a lens in another embodiment of the present invention.

[0038] Description of Figure Numbers:

[0039] 100, shell; 100a, plug-in slot; 101, power mounting interface; 102, mounting fitting part; 103, shaft; 103, data interface; 200, drive assembly; 201, drive member; 202, transmission member; 300, UWB module; 301, signal transmitter; 302, signal receiver; 302a, mounting plate; 303, main control chip; 400, control module; 500, rack; 600, mounting bracket; 700, lens; F, data cable; 701, host; 702, protective frame.

[0040] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme 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 of 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.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. 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 at the same time.

[0044] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0045] To facilitate understanding of the embodiments of the present application, the following first introduces the relevant technologies involved in the embodiments of the present application:

[0046] UWB (Ultra Wide Band) is a wireless carrier communication technology. The main feature of this technology is that it can achieve high-precision ranging, positioning, and high-speed data transmission. It does not use a sinusoidal carrier, but uses nanosecond non-sinusoidal narrow pulses to transmit data. Therefore, it occupies a large spectrum range. Although it uses wireless communication, its data transmission rate can reach more than several hundred megabits per second.

[0047] The principle of UWB precise ranging is based on the time of flight (ToF) or time difference of flight (TDOA) of the signal between two asynchronous transceivers to measure the distance between nodes. The characteristics of UWB signals are extremely narrow pulse width and extremely high time resolution, so the distance can be obtained by multiplying the speed of light.

[0048] The utility model uses the characteristics of UWB precise distance measurement to propose a lens automatic focus control device, which is applied to photographic equipment with replaceable focus and follow-focus lenses, including but not limited to cameras, video cameras, and surveillance video equipment. It is mainly reflected in the automatic focus and follow-focus of different models or non-original lenses. For ease of understanding, the following embodiments are illustrated by taking video cameras and video cameras as examples.

[0049] like Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the assembly of the automatic focus device of the lens and the lens in one embodiment of the utility model. Figure 2 This is a schematic diagram of the structure of an automatic focus device for a lens in an embodiment of the present invention. Figure 3 Schematic diagram of electrical connection of a module in one embodiment of the utility model.

[0050] The automatic focus following device for a lens provided by the utility model comprises:

[0051] Housing 100;

[0052] A driving assembly 200 connected to the housing 100 and used to adjust the focus of the lens 700;

[0053] The UWB module 300 includes a signal transmitter 301 and a signal receiver 302, wherein the signal transmitter 301 is placed on the photographed object and the signal receiver 302 is connected to the housing 100, or the signal receiver 302 is placed on the photographed object and the signal transmitter 301 is connected to the housing 100;

[0054] The control module 400 is disposed in the housing 100 and is electrically connected to the driving assembly 200 and the signal receiver 302 . The control module 400 is used to control the driving assembly 200 to work according to data fed back by the signal receiver 302 , so as to realize automatic focus control of the lens 700 .

[0055] In this embodiment, the housing 100 is a component that carries various components and is installed on the photographic device. Its material can be made of lightweight, high-strength carbon fiber. The housing 100 made of carbon fiber can reduce the weight of the entire device and ensure the strength of the housing 100. Of course, in other embodiments, materials such as plastic can also be used.

[0056] In this embodiment, the driving assembly 200 is a component for driving the lens 700 to rotate to achieve follow focus and focus, and can be a combination of a motor and a gear. For example, the motor is arranged in the housing 100, and the gear is installed on the output shaft of the motor as the execution end, and a part of the gear extends out of the housing 100 to drive the gear bar wound around the peripheral wall of the lens 700. In this way, the driving assembly 200 can drive the gear bar according to the rotation parameters calculated in real time under the control of the control module 400, thereby driving the lens 700 to rotate a corresponding angle to achieve automatic follow focus and focus.

[0057] The signal transmitter 301 and the signal receiver 302 are one of the important components of the UWB module 300 for measuring the distance between the lens 700 and the object being photographed; the signal transmitter 301 is also called a "beacon", which is mainly used to be placed at the object being photographed, such as worn on an actor, and the signal transmission switch is turned on to transmit a wireless signal. The signal receiver 302 is mainly installed at the shooting device, for example, it can be installed on the housing 100 or installed on the protective bracket 702. The signal receiver 302 is mainly used to receive the wireless signal reflected by the "beacon".

[0058] There are many distance measurement methods based on the signal transmitter 301 and the signal receiver 302, for example:

[0059] 1. Two-way time-of-flight (TW-TOF): This method calculates the distance between the signal transmitter 301 and the signal receiver 302 by measuring the time difference between the signal being sent and received. This method requires two-way communication between the "beacon" and the receiver, that is, both the "beacon" and the receiver can transmit and receive signals.

[0060] 2. Time of Arrival (TOA): This method calculates the distance between the signal transmitter 301 and the signal receiver 302 by measuring the time point when the signal arrives from the signal transmitter 301 to the signal receiver. This method only requires the signal transmitter 301 to be able to transmit signals and the signal receiver 302 to be able to receive signals, and does not require two-way communication.

[0061] 3. Time Difference of Arrival (TDOA): This method measures the time difference between the signal reaching two or more signal receivers to calculate the distance between the signal transmitter 301 and the signal receiver 302. This method also only requires the signal transmitter 301 to be able to transmit signals and the signal receiver 302 to be able to receive signals, and does not require two-way communication.

[0062] In the process of performing automatic lens focusing based on the arrival time method (TOA) of this embodiment, the UWB module 300 can determine the position by sending and receiving short pulse electromagnetic wave signals. For example, by measuring the time difference between the signal reflector 301 sending the signal to the signal receiver 302, the distance between the lens 700 and the object can be calculated.

[0063] The control module 400 further processes the distance parameter to obtain the working parameter of the driving component 200, and controls the driving component 200 to work according to the parameter to drive the lens 700 to rotate to a corresponding angle, and finally achieves the focal length of the lens 700 to be consistent with the distance of the target object, thereby achieving the purpose of automatic focusing.

[0064] During the focus tracking process, the UWB module 300 can monitor the distance between the lens 700 and the object being photographed in real time. For example, when taking photos in scenes such as stadiums and stages, the signal transmitter 301 can be worn on the actor in advance, and the signal transmission switch can be turned on to turn on the signal transmitter 301. Then, the signal receiver 302 can be installed on the shooting device to receive the wireless signal reflected by the signal transmitter 301. During the shooting process, the distance between the actor and the lens 700 changes continuously, and the time for the signal reflected by the signal transmitter 301 to reach the signal receiver 302 will also be different. The main control chip 303 (in this embodiment, the main control chip 303 integrated in the UWB module 300 can be used) 03 performs data calculations, of course, in other embodiments, it can also be integrated into the control module 400 and processed by the control module 400) can calculate the distance between the signal transmitter 301 and the signal receiver 302 by measuring the time point when the wireless signal arrives at the signal receiver 302 from the signal transmitter 301. At the same time, the main control chip 303 transmits the distance parameter to the control module 400, and the control can generate the working parameter of the driving component 200 according to the parameter, control the driving component 200 to work, so as to drive the lens 700 to rotate in real time to control the focus and achieve the purpose of following the focus.

[0065] The technical solution in this embodiment connects the signal receiver 302 to the housing 100, sets the drive assembly 200 at an interval, and places the signal transmitter 301 on the object to be photographed; by measuring the time point when the wireless signal arrives from the signal transmitter 301 to the signal receiver 302, the distance between the object to be photographed and the lens 700 is calculated, and then the control module 400 calculates the appropriate focal length based on the distance data, and controls the drive assembly 200 to adjust the focus of the lens 700, thereby realizing automatic focus control.

[0066] In addition, the device can reduce the complexity and errors of manual operation, improve the efficiency and quality of shooting, and is suitable for various occasions and environments, such as sports shooting, macro shooting, night shooting, etc.

[0067] In some embodiments, in addition to the configuration method in the above embodiment in which the signal transmitter 301 is placed at the photographed object and the signal receiver 302 is placed on the shooting device, the signal receiver 302 can also be placed at the photographed object and the signal transmitter 301 can be configured at the shooting device. Both methods can realize the calculation of the distance between the photographed object and the lens 700.

[0068] See also Figures 2 to 5 In this embodiment, the signal receiver 302 is detachably connected to the housing 100. When the signal receiver 302 is in a detached state from the housing 100, the signal receiver 302 can be data-connected to the control module 400 via a data cable or wirelessly.

[0069] In this embodiment, the housing 100 may be configured as a long strip-shaped polyhedron, and the data interface 104 may be disposed on one side of the housing 100 , and the signal receiver 302 is disposed on the top of the housing 100 .

[0070] In this embodiment, a modular design is adopted between the signal receiver 302 and the housing 100. For example, the signal receiver 302 can be a single signal receiver 302, which is installed on the top of the housing 100 by screwing, and the signal receiver 302 and the control module 400 can be electrically connected through a data line. Figure 2 As can be seen in the figure, a data interface is provided on one side of the housing, which can be connected to the data line of the signal receiver 302 to realize wired data connection. In this way, the signal receiver 302 is placed outside the housing 100 and a modular assembly method is adopted, which is conducive to subsequent maintenance and replacement, and is easy to carry.

[0071] In another embodiment, in addition to the above-mentioned wired data connection method with the control module 400, the signal receiver 302 can also use a wireless data connection method to connect to the control module 400. The wireless data connection method can get rid of the constraints of data cables and can flexibly adjust the position of the signal receiver 302, which is very convenient.

[0072] In one embodiment, the signal receiver 302 can be mounted on the top of the housing 100. As for how to stably mount the signal receiver 302 on the top of the housing 100, it can be achieved by setting a mounting plate 302a. Figure 2 As shown, a data interface is provided on the housing, and the UWB module 300 further includes a mounting plate 302 a connected to the top of the housing 100 . The signal receiver 302 is disposed on the mounting plate 302 a and exposed at the top of the housing 100 .

[0073] In this embodiment, one end of the mounting plate 302a is connected to the top of the housing 100, and the connection method can be screws, clamping, etc. After the mounting plate 302a is installed on the top of the housing 100, a plane will be presented, and the plane can be used to install the signal receiver 302. For easy disassembly, the signal receiver 302 can be connected to the mounting plate 302a by clamping. Of course, in some embodiments, the mounting plate 302a can also be integrated at the bottom of the signal receiver 302.

[0074] Continue reading Figure 2 and Figure 4In this embodiment, there are multiple ways of wired connection between the signal receiver 302 and the control module 400, which may be wired connection through a data line F or wired data connection through plugging and the like. Specifically, the signal receiver 302 is electrically connected to the control module 400 through the data line F, or the mounting plate 302a is provided with a first terminal electrically connected to the control module 400, and the signal receiver 302 is provided with a second terminal adapted to the first terminal, and when the signal receiver 302 is mounted on the housing 100, the first terminal is electrically connected to the second terminal.

[0075] The data line connection method may be that the signal receiver 302 is electrically connected to the control module 400 via a data line F, one end of the data line F is connected to the signal receiver 302 , and the other end of the data line F passes through the housing 100 and is connected to the control module 400 .

[0076] In this embodiment, one end of the data line F can be fixedly connected to the signal receiver 302, and the other end is provided with a connector, which passes through the housing 100 and is connected to the control module 400 (the data interface 104 is welded on the control module 400, and the docking end extends out of one side of the housing 100). Of course, in some embodiments, in order to implement a modular design, both ends of the data line F can be configured as connectors, and then corresponding models of data interfaces 104 are provided on the control module 400 and the signal receiver 302. As for the connector of the data line F and the model of the data interface 104, it can be an interface such as Type-C and USB. If the transmission speed is taken into consideration, the Thunderbolt 3 data transmission protocol can be adopted, which can support a data transmission speed of up to 20Gbps and a fast charging power of 100W.

[0077] In addition, you can Figure 2 As can be seen in the figure, in this embodiment, at least one interface for data line plugging is provided on the side of the housing 100 to realize the basic ranging function. However, in order to expand more measurement methods and functions, another interface can be reserved on the side of the housing. Of course, in addition to the reserved interface, the signals fed back by multiple signal receivers 302 can be concentrated through a multiplexer and transmitted to the control module 400 through a data interface 104. The principle is that multiple signals can be combined together in different ways, such as time division multiplexing, frequency division multiplexing, code division multiplexing, etc. This method can effectively improve the utilization efficiency of communication resources and realize the simultaneous transmission of multiple data streams.

[0078] As for the plug-in wired data connection mode, a first terminal may be provided on the mounting plate 302a, the first terminal being electrically connected to the control module 400, and then a second terminal adapted to the first terminal is provided on the signal receiver 302, the mounting plate 302a being mounted on the housing 100, and when the signal receiver 302 is mounted on the mounting plate 302a, the first terminal is electrically connected to the second terminal, thereby realizing a wired data connection between the signal receiver 302 and the control module 400.

[0079] See also Figure 7 In this embodiment, the lens automatic focus control device includes multiple signal transmitters 301, and the multiple signal transmitters 301 are paired with the same signal receiver 302.

[0080] For example, three signal transmitters 301 are respectively located on the top, left side and right side of the camera. These transmitters can work independently or in coordination to adapt to different shooting scenes. For example, in a dimly lit indoor environment, the three transmitters work simultaneously to provide sufficient signal information to the receiver so that the camera can quickly find and lock the focus point. In this way, even in an undesirable environment, the user can quickly take clear photos. This design of multiple signal transmitters 301 makes the camera's autofocus system more powerful and flexible, able to adapt to more shooting conditions and provide a better user experience.

[0081] Furthermore, the multiple signal receivers 302 include multiple signal frequency bands, and the multiple signal frequency bands are respectively matched with the multiple signal transmitters 301. The signal receivers 302 switch the position information of different signal transmitters 301 to the control module so that the driving component drives the lens to switch the focus target.

[0082] For example, four signal transmitters 301 are used as an example, each transmitter operates at a different signal frequency band. These transmitters are located at the top, bottom, left and right of the camera respectively. The signal receiver 302 in the camera can identify the signals from these four different positions and can switch to the corresponding signal frequency band as needed.

[0083] In an actual shooting scenario, for example, at an indoor party, the camera user wants to shoot a person walking from the left to the center. The camera control module instructs the signal receiver 302 to focus on the signal frequency band of the left signal transmitter 301. When the person enters the signal range of the left transmitter, the receiver captures the signal and transmits the position information to the control module. Then, the control module instructs the drive component to adjust the lens to ensure that the person is in a clear focus range.

[0084] As the person continues to move toward the center, the control module can switch the receiver to receive the signal band of the upper or lower transmitter to track the person's movement and maintain focus (in conjunction with the motion gimbal). This configuration of multiple signal bands and transmitters allows the camera to quickly and accurately adjust the focus in a dynamic environment, maintaining image clarity no matter how the subject moves.

[0085] In another embodiment, see Figure 4 , Figure 4 Schematic diagram of the structure of the automatic focus device of the lens in another embodiment of the utility model. In this embodiment, the top of the upper housing 100 is configured with a plug slot 100a, and the signal receiver 302 is plugged into the plug slot 100a and electrically connected to the control module 400.

[0086] In this embodiment, the insertion slot 100a provided on the top of the housing 100 is mainly used for inserting the signal receiver 302. At the same time, a pin can be provided inside the insertion slot 100a, and the pin is electrically connected to the control module 400; the portion of the signal receiver 302 inserted into the insertion slot 100a is provided with a corresponding pinhole. When the signal receiver 302 is inserted into the insertion slot 100a, it can be relatively fixed with the housing 100 and can also be electrically connected to the control module 400 at the same time, so as to facilitate signal feedback. At the same time, the signal receiver 302 and the housing 100 are detachable, which is conducive to reducing space occupancy and convenient for photographers to disassemble and carry.

[0087] In some embodiments, the automatic focus control device of the lens 700 further includes a power mounting interface 101 , which is disposed on a side wall of the housing 100 and is used to mount a battery.

[0088] In this embodiment, the external battery is used to facilitate replacement of the battery. Figure 5 As shown, a power interface and a mounting portion are set on the outer wall of the shell 100. During use, the battery can be mounted on the power mounting interface 101. The battery and the shell 100 are relatively fixed and conductive at the same time to provide working power for the entire device. After shooting for a period of time, when the battery power is low, the battery can be directly removed from the shell 100 and replaced with a fully charged battery mounted outside the shell 100, which is very convenient.

[0089] See also Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of an automatic focus device for a lens in an embodiment of the present invention. Figure 6 The figure is a schematic structural diagram of an automatic focus follow device for a lens in another embodiment of the present invention.

[0090] In this embodiment, a rotating shaft 103 is configured on one side surface of the housing 100 , and the rotating shaft 103 is spaced apart from the data interface 104 ;

[0091] The drive assembly 200 comprises:

[0092] The driving member 201 is disposed in the housing 100 and spaced apart from the control module 400 .

[0093] The transmission member 202 is rotatably disposed on the rotating shaft 103 . The transmission member 202 is in driving connection with the output shaft of the driving member 201 . The transmission member 202 is used to drive the lens 700 to rotate.

[0094] In this embodiment, the driving member 201 is a component for accurately driving the lens 700 to adjust the focal length, and can adopt a micro stepping motor, a micro servo motor, etc. This type of motor can achieve position closed-loop control through a built-in high-resolution encoder, thereby avoiding the problems of loss of step and jitter.

[0095] The transmission member 202 in this embodiment, as a component for transmitting power, can be a gear, a roller, etc. The transmission member 202 is mainly installed on the rotating shaft 103 and is connected to the output shaft of the driving member 201; when the automatic focus control device of the lens 700 is assembled on the shooting equipment, the transmission member 202 directly contacts the focus ring of the lens 700, and the rotational force of the driving member 201 is transmitted through the transmission member 202, so that the focus ring of the lens 700 rotates accordingly.

[0096] In one embodiment, to prevent the transmission member 202 and the focus ring of the lens 700 from slipping, a layer of silicone, rubber or other material may be coated on the surface of the transmission member 202 to increase the friction between the transmission member 202 and the focus ring of the lens 700 .

[0097] In some embodiments, a layer of rubber, silicone or other material may be coated on the portion of the rack 500 that contacts the peripheral wall of the lens 700. When the rack 500 is driven by the execution end of the driving assembly 200, the back of the rack 500 may be in good contact with the peripheral wall of the lens 700, thereby avoiding slipping and improving the accuracy of focus control.

[0098] Continue reading Figure 5 and Figure 6 In this embodiment, the automatic focus control device of the lens 700 further includes:

[0099] A mounting bracket 600, one end of which is used to connect with a protective frame 702;

[0100] A movable fastener 102 is configured at the bottom of the housing 100 , and the movable fastener 102 is detachably connected to the other end of the mounting bracket.

[0101] In this embodiment, the mounting bracket 600 is mainly used to stably mount the housing 100, the signal receiver 302 and other components on the photographing device; specifically, one end of the mounting bracket 600 can be directly connected to the protective frame 702 (the protective frame 702 is commonly known as a "rabbit cage" and is mainly installed outside the host 701 of the photographic device to protect the host 701. At the same time, it can also expand some installation interfaces to facilitate the installation of auxiliary equipment and devices), and the other end is detachably connected to the movable fastener 102. Through the connection and cooperation between the movable fastener 102 and the mounting bracket 600, the housing 100 can be stably mounted on the mounting bracket 600. At the same time, the distance between the transmission member 202 and the rack 500 can be adjusted during use to ensure that the execution end of the drive assembly 200 is stably engaged with the rack 500.

[0102] In some embodiments, one end of the movable fastener 102 may be hinged to the housing 100, and the other end may be provided with a locking screw. Of course, in another embodiment, the movable fastener 102 may be integrally formed with the housing 100, such as Figure 4 As shown in , one end of the movable fastener 102 is integrally formed with the housing 100 , and the other end is opened to the housing 100 and is provided with a locking screw.

[0103] The utility model further proposes a photographing device, including a lens 700, a rack 500, a main unit 701, a protective frame 702 and the aforementioned automatic focusing device for the lens. The specific structure of the automatic focusing device for the lens is referred to the above embodiment. Since the photographing device adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the rack 500 can be detachably wound around the peripheral wall of the lens 700. Figure 7 As shown, the automatic focus control device of the lens 700 of the UWB positioning technology is installed near the lens 700, and the "beacon" (signal transmitter 301) can be worn on the subject to be photographed to send wireless signals. The signal receiver 302 is installed at the housing 100 and the shooting device to receive wireless signals to measure the distance between the lens 700 and the subject in real time. Then the control module 400 controls the driving component 200 to work according to the distance parameter to drive the lens 700 to rotate to a corresponding angle, and finally the focal length of the lens 700 is rotated to be consistent with the distance of the subject to be photographed, thereby achieving the purpose of automatic focusing and following focus of the lens 700.

[0104] See also Figure 7 and 8 , Figure 7 This is a structural schematic diagram of an automatic focus device for a lens in another embodiment of the utility model. Figure 8 The figure is a schematic structural diagram of an automatic focus follow device for a lens in another embodiment of the present invention.

[0105] Except for the method of mounting the signal receiver 302 on the housing 100 in the aforementioned embodiment (from Figure 7 As can be seen in FIG. 7 , the signal receiver can also be installed on the protective frame 702, which can be seen from Figure 8 As can be seen from the figure, the data transmission method between the two can be through a wired data connection or a wireless data connection.

[0106] In this embodiment, the signal receiver 302 and the multiple signal transmitters 301 can use multi-beam technology to simultaneously transmit and receive multiple UWB signals of different frequencies, calculate the distance and direction between the lens 700 and the subject according to the flight time (ToF) and phase difference of each signal, and automatically adjust the focus parameters of the lens 700 according to the changes in distance and direction, so that the image of the subject always remains clear.

[0107] See also Figure 5 and Figure 6 In this embodiment, the automatic focusing device of the lens further includes a rack 500 , which can be wound around the peripheral wall of the lens 700 , and the rack 500 is used to engage with the transmission member 202 .

[0108] In this embodiment, the rack 500 is a component wound around the peripheral wall of the lens 700, and it can be made of a flexible material. The rack 500 made of a flexible material can better fit the peripheral wall of the lens 700. The ratchet teeth of the rack 500 can be made of a metal material to reduce wear. In this way, the rack 500 can fit the peripheral wall of the lens 700 and ensure transmission stability.

[0109] In this embodiment, the rack 500 is wound around the peripheral wall of the lens 700 in an adjustable manner. Specifically, a stop buckle (similar to the stopping principle of a cable tie) is provided at one end of the rack 500, and a stop claw is provided inside the stop buckle. When the gear 500 is assembled on the lens 700, the rack 500 is wound around the peripheral wall of the lens 700, and then the other end of the rack 500 is placed in the stop buckle. Due to the one-way stopping principle of the stop buckle, the rack 500 can be continuously pulled until the rack 500 is in contact with the outer wall of the lens 700. After stopping pulling, the stop claw is extended into the ratchet to achieve stopping.

[0110] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A lens automatic focus control device, characterized in that: include: case; A driving assembly connected to the housing and used to adjust the focus of the lens; The UWB module comprises a signal transmitter and a signal receiver, wherein the signal transmitter is placed on the photographed object and the signal receiver is connected to the housing, or the signal receiver is placed on the photographed object and the signal transmitter is connected to the housing; The control module is disposed in the housing and is data-connected to the drive assembly and the signal receiver. The control module is used to control the drive assembly to work according to data fed back by the signal receiver to achieve automatic focus control of the lens.

2. The automatic focus control device for a lens according to claim 1, characterized in that: The signal receiver is detachably connected to the shell. When the signal receiver is in a detached state from the shell, the signal receiver can be data-connected to the control module via a data line or wirelessly.

3. The automatic focusing device of a lens according to claim 2, characterized in that: The shell is provided with a data interface, the UWB module further comprises a mounting plate connected to the top of the shell, and the signal receiver is arranged on the mounting plate and exposed outside the shell.

4. The automatic focusing device of a lens according to claim 3, characterized in that: The signal receiver is electrically connected to the control module via a data line; or, The mounting plate is provided with a first terminal electrically connected to the control module, the UWB is provided with a second terminal adapted to the first terminal, and when the signal receiver is mounted on the housing, the first terminal is electrically connected to the second terminal.

5. The automatic focusing device of a lens according to claim 2, characterized in that: The lens automatic focus control device comprises a plurality of the signal transmitters, and the plurality of the signal transmitters are paired with the same signal receiver.

6. The automatic focusing device of a lens according to claim 5, characterized in that: The signal receiver includes a plurality of signal frequency bands, and the plurality of signal frequency bands are respectively matched with the plurality of signal transmitters. The signal receiver switches the position information of different signal transmitters to the control module so that the driving component drives the lens to switch the focus target.

7. The automatic focus control device for a lens according to claim 2, characterized in that: The top of the shell is configured with a plug-in slot, the signal receiver is plugged into the plug-in slot and is electrically connected to the control module.

8. The automatic focusing device of a lens according to claim 3, characterized in that: A rotating shaft is configured on one side surface of the housing and is spaced apart from the data interface; The drive assembly comprises: A driving member, disposed in the housing and spaced apart from the control module; The transmission member is rotatably disposed on the rotating shaft, the transmission member is in transmission connection with the output shaft of the driving member, and the transmission member is used to drive the lens to rotate.

9. The automatic focus control device for a lens according to claim 1, characterized in that: Also includes: A mounting bracket, one end of which is used to connect to the protective frame; A movable fastener is configured at the bottom of the shell, and the movable fastener is detachably connected to the other end of the mounting bracket.

10. A photographing device, characterized in that: A lens comprising a lens and the automatic focus control device for a lens according to any one of claims 1 to 9; A rack, the rack being detachably wound around the peripheral wall of the lens; Host; A protection frame is connected to the host, and the signal receiver is installed on the top of the shell and the protection frame.

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