WO2023279242A1

WO2023279242A1 - Lens assembly of image acquisition device, and image acquisition device

Info

Publication number: WO2023279242A1
Application number: PCT/CN2021/104563
Authority: WO
Inventors: 滕文猛; 胡涛; 韩守谦
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2023-01-12

Abstract

A lens assembly (100, 200, 410) and an image acquisition device (400). The lens assembly (100, 200, 410) comprises a focusing lens (140, 221, 414). The lens assembly (100, 410) further comprises a distance measurement module (110, 411), a drive module (120, 412) and a control module (130, 413), wherein the distance measurement module (110, 411) is used to measure a first distance between the lens assembly (100, 410) and a focus area in a scene; and the control module (130, 413) is used to control the drive module (120, 412) according to the first distance, such that the drive module (120, 412) drives the focusing lens (140, 414) to focus. A focusing system is integrated inside the lens assembly (100, 200, 410), such that the lens assembly (100, 200, 410) can independently complete automatic focusing without depending on cooperation with a body (410) of the image acquisition device (400), thus achieving better compatibility.

Description

Lens assembly of image acquisition device and image acquisition device

technical field

The present application relates to the field of imaging, and in particular to a lens assembly of an image acquisition device and an image acquisition device.

Background technique

During the image acquisition process, in order to ensure that a clear image is acquired, it is often necessary for the image acquisition device to complete focusing before image acquisition. However, image acquisition devices, such as cameras, generally achieve autofocus through the joint work of the body and lens components, but at present, only the body and lens components produced by the same manufacturer can cooperate to complete autofocus, that is, the lens components can only be matched with the model and lens components. The body that matches its own model cannot be used with other bodies to complete autofocus.

Contents of the invention

In view of this, embodiments of the present application provide a lens assembly of an image acquisition device and an image acquisition device.

In the first aspect, an embodiment of the present application provides a lens assembly, the lens assembly includes a focusing lens, and the lens assembly further includes a distance measuring module, a driving module, and a control module;

The ranging module is used to measure the first distance between the lens assembly and the focus area in the scene;

The control module is configured to control the driving module according to the first distance, so that the driving module drives the focusing lens to focus.

In the second aspect, the embodiment of the present application provides an image acquisition device, including a lens assembly and a body, the lens assembly is mounted on the body, the lens assembly includes a focusing lens, and the lens assembly also includes a distance measuring module , drive module and control module;

The lens assembly provided by the embodiment of the present application uses the ranging module to measure the first distance between the lens assembly and the focus area in the scene, and then the control module calculates whether the current lens assembly is in the in-focus state according to the measured first distance, and then controls the The driving module drives the focusing lens to focus. This application integrates the focusing system inside the lens assembly, so that the lens assembly can independently complete autofocus without relying on the cooperation with the body of the image acquisition device, so that the lens assembly can be commonly used in the body of more image acquisition devices , the compatibility of lens components is better.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a lens assembly shown in an exemplary embodiment of the present application.

Fig. 2 is a schematic structural diagram of a more specific lens assembly shown in an exemplary embodiment of the present application.

Fig. 3 is a schematic structural diagram of an image acquisition device shown in an exemplary embodiment of the present application.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. And in case of conflict, the various embodiments can be combined with each other.

In the process of collecting images, the current image acquisition equipment completes the automatic focusing through the linkage between the fuselage and the lens assembly. The main control module controls the lens assembly to complete autofocus according to the detection result. In order for the body to normally control the lens assembly to complete autofocus, it is necessary to ensure that the body and the lens assembly can work together. However, at present, only the body and lens assembly produced by the same manufacturer can match each other. For the body produced by different manufacturers and the lens assembly, it may be that the body and the lens assembly cannot cooperate with each other to complete autofocus due to the failure of normal communication between the body and the lens assembly. The components cannot communicate normally; or the positions of the electronic contacts on the connection bayonet between the body and the lens set by different manufacturers may not match, resulting in the normal communication between the body and lens components through the electronic contacts may not be possible; or Is the damage of electronic contacts, etc. The current lens components can only be used with the fuselage produced by the same manufacturer and whose model matches its own model. This type of lens component has poor compatibility and is not universal enough.

In view of at least the above-mentioned problems, the embodiment of the present application first proposes a lens assembly of an image acquisition device, wherein the image acquisition device can be a camera, a video camera, a camera, a scanner, etc., and the image acquisition device can be composed of a body and a lens assembly , the body and the lens assembly may be detachably connected, or may be non-detachable (that is, integrated), which is not limited.

Specifically, referring to FIG. 1, FIG. 1 is a schematic structural diagram of a lens assembly shown in an exemplary embodiment of the present application, wherein the lens assembly 100 includes a ranging module 110, a driving module 120, a control module 130, and a focusing lens 140;

The ranging module 110 is configured to measure a first distance between the lens assembly 100 and the focus area in the scene;

The control module 130 is configured to control the driving module 120 according to the first distance, so that the driving module 120 drives the focusing lens 140 to focus.

The lens assembly 100 provided in the embodiment of the present application uses the ranging module 110 to measure the first distance between the lens assembly and the focus area in the scene, and then the control module 130 calculates whether the current lens assembly 100 is in focus according to the measured first distance state, and then control the driving module 120 to drive the focusing lens 140 to focus. This application integrates the focusing system inside the lens assembly 100, so that the lens assembly 100 can independently complete autofocus without relying on the cooperation with the body of the image acquisition device, so that the lens assembly 100 can be commonly used in more image acquisition devices The camera body and the lens assembly 100 have better compatibility.

The focus area mentioned herein can be understood as the corresponding area of the preset area on the image captured by the image acquisition device in the scene, and the preset area can be any area preset on the screen, for example, it can be the central area, of course It is not limited to this. In addition, the preset area can be one or more points, or one or more areas, and the specific configuration can be set by technicians according to the required focus mode.

The ranging module 110 may be a time of flight (Time Of Flight, TOF) sensor, specifically, it may be a laser distance sensor, an ultrasonic distance sensor, an infrared ranging sensor, etc. Measure the time it takes for an object, particle or wave to fly a certain distance in a fixed medium, and combine the flight speed of the object, particle or wave to calculate the distance of the flight to achieve distance measurement. The driving module 120 may be a driving motor, and the control module 130 drives the focusing lens 140 to focus by controlling the driving motor. The lens assembly 100 may also include a lens group, which may include lenses for focusing, zooming, etc., and the focusing lens 140 may be packaged in the lens group and move along the optical axis of the lens group, so that the control module 130 When controlling the driving module 120 to drive the focusing lens 140 to focus, the driving module 120 may drive the focusing lens 140 to move to a reasonable position along the optical axis of the lens group to complete focusing. In addition, the number of focusing lenses 140 may be one or more, and technicians can set it according to actual needs.

Further, when the lens assembly 100 is installed on the body of the image acquisition device and works normally, the distance measuring module 110 can continuously measure the first distance between the lens assembly 100 and the focus area in the scene in real time, and the control module 130 automatically controls the driving module 120 to perform a focusing operation according to the first distance, so that the lens assembly 100 can automatically complete the focusing without the user triggering a focusing instruction.

In addition, when the control module 130 receives the focus instruction, it may respond to the focus instruction to control the distance measurement module 110 to perform distance measurement, and control the drive module 120 to perform the focus operation according to the first distance measured by the distance measurement module 110. Yes, the control module 130 may execute the focusing operation after receiving the focusing instruction triggered by the lens assembly 100 . Wherein, the lens assembly 100 can be provided with a control for the user to trigger the focus command, and the user can input the focus command by operating the control. The specific form of the control is not limited, for example, it can be a button, a knob, etc. It may be a depressible button or a non-depressible button, and it is not limited thereto. In addition to triggering the focus command through the control, in order to make the focus trigger more convenient, in some cases, a voice recognition module can also be configured in the lens assembly 100, which can be used to receive and recognize the user's voice input, so that the user can pass the input Voice commands such as "focus" and "focus in XX focus mode" are sent to the control module 130 to execute the focus operation after the voice recognition module recognizes the focus command. It can be understood that the methods of triggering the focus command mentioned above are only for illustration and not limitation. How to set the trigger mode of the focus command can be set by technicians according to requirements. Thus, the lens assembly 100 can complete focusing when the user triggers a focusing instruction, thereby preventing the lens assembly 100 from continuously performing the focusing operation, and reducing the power consumption of the lens assembly 100 to a certain extent.

In an embodiment, the lens assembly 100 may further include a bayonet, and the lens assembly 100 may be fastened to the body of the image acquisition device through the bayonet. Further, the bayonet socket on the lens assembly 100 can also be provided with electronic contacts, so that the lens assembly 100 can also be electrically connected to the body of the image acquisition device through the electronic contacts while being engaged with the body of the image acquisition device. , so that the lens assembly 100 can communicate with the camera body.

In the case that the lens assembly 100 is installed on the body of the image acquisition device and can normally exchange data with the body, the focusing instruction can also be triggered by the body, for example, it can be triggered by related controls configured on the body, Specifically, the focus instruction can be triggered when the user clicks a focus-related button; or it can also be triggered through the touch display screen equipped on the fuselage. Specifically, the focus instruction can be triggered when the user clicks the touch display screen on the fuselage. Of course It is not limited to this.

When the fuselage triggers the focusing command, the main control unit on the fuselage can directly respond to the focusing command, obtain the first distance measured by the ranging module 110 and control the driving module 120 to drive the focusing lens 140 to focus according to the first distance; or When the body triggers the focus command, the focus command can be sent to the control module 130 on the lens assembly 100 through the electronic contact on the bayonet, and the control module 130 receives the focus command triggered by the body through the electronic contact. In this case, perform the corresponding focusing operation.

In some cases, when the body of the image acquisition device triggers the focus command, the body can also issue information carrying the focus position to the lens assembly 100 through the electronic contacts on the bayonet, for example, the user touches the display screen on the body The focus position information clicked on, or the default focus position information, the control module 130 in the lens assembly 100 can determine the focus area in the scene according to the received information carrying the focus position, and control the distance measurement module 110 to perform distance measurement and control The driving module 120 performs a focusing operation.

In one embodiment, the control module 130 controls the driving module 120 to drive the focusing lens 140 to focus according to the first distance measured by the measuring module 110. Specifically, according to the focal length of the lens assembly 100, the first distance measured by the measuring module 110, the focusing lens The second distance between 140 and the image sensor on the body of the image acquisition device controls the driving module 120 so that the driving module 120 drives the focusing lens 140 to focus. Specifically, focusing can be performed according to related imaging formulas, such as the Gaussian imaging formula:

Where f represents the focal length, u represents the object distance, and v represents the image distance. The object distance u is determined by the first distance measured by the measurement module 110, and the focal length f adopted by the lens assembly 100 is obtained at the same time, and the image distance v is determined according to the second distance between the focusing lens 140 and the image sensor on the body of the image acquisition device, And the image distance v is adjusted so that the adjusted focal length f, the object distance u and the image distance v satisfy the formula 1, thereby completing the focusing.

It should be noted that although the object distance u is actually the distance between the focus area in the scene and the focus lens 140, since the position of the measurement module 110 on the lens assembly 100 is relatively small from the position of the focus lens 140, it is also The first distance measured by the measuring module 100 can be directly used as the approximate object distance u. Of course, in order to ensure the focusing accuracy to the greatest extent, the accurate object distance u can also be obtained for focusing in combination with the first distance measured by the measuring module 110 and the distance between the measuring module 110 and the focusing lens 140 .

How to improve focus accuracy is introduced with a more specific embodiment. In one embodiment, the focusing lens 140 may be arranged between the measurement module 110 and the bayonet mount on the lens assembly 100, thus, the first distance measured by the measurement module 110 and the distance between the distance measuring module 110 and the focusing lens 140 may be Determine the object distance u by the distance between them, for example, add the first distance and the distance between the ranging module 110 and the focusing lens 140 to obtain the object distance u; meanwhile, the distance between the focusing lens 140 and the bayonet and the flange Determine the second distance between the focus lens 140 and the image sensor on the body of the image acquisition device, for example, add the distance between the focus lens 140 and the bayonet and the flange distance to obtain the image distance v, where the flange distance That is, when the lens assembly 100 is installed on the image acquisition device, the distance between the mount of the lens assembly 100 and the image sensor on the body of the image acquisition device. Thus, the focusing lens 140 is driven to move along the optical axis of the lens module 100 by controlling the driving module 120, so that the result of adding the reciprocal of the object distance u and the reciprocal of the image distance v is the reciprocal of the focal length f, that is, the adjusted The image distance v, the object distance u, and the image distance v satisfy Formula 1, thereby completing focusing.

It can be understood that the above embodiment describes how to determine the accurate object distance u and image distance v for focusing when the focusing lens 140 is arranged between the distance measuring module 110 and the bayonet. In the case where the interface is arranged in other ways, for example, when the distance measuring module 110 is set between the focusing lens 140 and the bayonet, the object distance u and the image distance v can still be determined based on similar principles for focusing, because the principles are similar , will not be introduced here.

In one embodiment, when the lens assembly 100 is installed on the body of the image acquisition device and can normally exchange data with the body, if the body is equipped with a detection module for focus detection, the control The module 130 can also receive the detection signal of the detection module through the electronic contact on the bayonet, and determine whether the current image acquisition device is in focus according to the detection signal, and then control the driving module 120 to drive the focusing lens 130 along the lens assembly 100 The optical axis of the camera moves to achieve focusing. The detection module for focus detection provided on the fuselage can be set by referring to focusing methods such as contrast focusing and phase focusing in related technologies, and will not be introduced here.

In one embodiment, because the electronic contacts on the mount of the lens assembly 100 cannot match the electrical contacts on the bayonet mount of the image capture device, the lens assembly 100 may only be installed on the body of the image capture device , but not only the data exchange between the lens assembly 100 and the body cannot be performed, but even the body cannot supply power to the lens assembly 100, which may result in failure to complete autofocus. In view of this problem, further, a power supply module can also be provided on the lens assembly 100 to supply power to the lens assembly 100, so that the lens assembly can realize its own power supply. Further, the lens assembly 100 may also include an aperture for realizing exposure.

Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of a more specific lens assembly shown in an exemplary embodiment of the present application. The lens assembly 200 includes a TOF module 210 , a lens group 220 , a focus key 230 , a mount 240 , and an aperture 250 . The lens group 220 includes a focusing lens 221 , and an electronic contact 241 is provided on the mount 240 . In addition to the components shown in the figure, the lens assembly 200 also includes a control chip (not shown in the figure) and a driving motor (not shown in the figure). Therefore, when the lens assembly 200 is installed on the body 300 of the image acquisition device, the lens assembly 200 is engaged with the bayonet socket on the body 300 through the bayonet socket 240, and the image sensor 310 on the body performs photoelectric conversion to generate an image. .

The lens assembly 200 can independently complete autofocus. The specific process can be that when the user triggers the focus instruction through the focus key 230, the control chip responds to the focus instruction and controls the TOF module 210 to perform distance measurement, and the TOF module 210 feeds back the measured distance To the control chip, the control chip determines whether the current lens assembly 200 is in a focus state based on the measured distance fed back by the TOF module, and controls the drive motor to drive the focusing lens 221 in the lens group 220 along the light of the lens assembly 200 when focusing is required. Axis movement to achieve focus.

The process of controlling the focus by the control chip may be to measure the distance u1 between the TOF module 210 and the focus area in the scene through the TOF module 210, and at the same time obtain the distance u2 between the focusing lens 221 and the TOF module 210 to determine the object distance u; And obtain the distance v1 and the flange distance v2 between the focusing lens 221 and the bayonet 240 to determine the image distance v, and adjust the image distance v in combination with the focal length f so that the adjusted image distance v, object distance u and focal length f satisfy Formula 1 also makes u1, u2, v1, v2 and f satisfy the following relationship:

Autofocus is thus achieved.

The lens assembly provided by the embodiment of the present application can independently complete auto-focus, so that the lens assembly has better compatibility and higher versatility. And through the distance focusing method, one frame of focus can be achieved, and the focusing speed is extremely fast.

The embodiment of the present application also provides an image acquisition device, see FIG. 3, which is a schematic structural diagram of an image acquisition device shown in an exemplary embodiment of the present application. The image acquisition device 400 includes a lens assembly 410 and a body 420. The lens assembly 410 is mounted on the body 420, and the lens assembly 410 includes a ranging module 411, a driving module 412, a control module 413 and a focusing lens 414;

The ranging module 411 is configured to measure a first distance between the lens assembly 410 and the focus area in the scene;

The control module 413 is configured to control the driving module 412 according to the first distance, so that the driving module 412 drives the focusing lens 413 to focus.

For the introduction of the image acquisition device provided by the present application, reference may be made to the description of the previous embodiments, which will not be expanded here.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. The term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The methods and devices provided by the embodiments of the present application have been described in detail above. The principles and implementation methods of the present application have been explained by using specific examples in this paper. The descriptions of the above embodiments are only used to help understand the methods and methods of the present application. core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the application .

Claims

A lens assembly of an image acquisition device, the lens assembly includes a focusing lens, and is characterized in that the lens assembly also includes a distance measuring module, a driving module, and a control module;

The ranging module is used to measure the first distance between the lens assembly and the focus area in the scene;

The control module is configured to control the driving module according to the first distance, so that the driving module drives the focusing lens to focus.
The lens assembly according to claim 1, wherein the control module is specifically configured to: perform a focusing operation when a focusing instruction triggered by the lens assembly is received.
The lens assembly according to claim 2, wherein a control is provided on the lens assembly, and the focusing instruction is triggered by the control.
The lens assembly according to claim 1, wherein the lens assembly further comprises a bayonet, and the lens assembly is fastened to the body of the image acquisition device through the bayonet.
The lens assembly according to claim 4, wherein an electronic contact is provided on the bayonet, and the lens assembly is electrically connected to the body of the image acquisition device through the electronic contact.
The lens assembly according to claim 5, wherein the control module is specifically configured to: perform a focusing operation when a focusing instruction triggered by the body is received through the electronic contact.
The lens assembly according to claim 6, wherein the control module is further configured to receive information carrying a focus position through the electronic contacts.
The lens assembly according to claim 4, wherein the control module is specifically used for:

Control the driving module according to the focal length of the lens assembly, the first distance, and the second distance between the focusing lens and the image sensor on the body, so that the driving module drives the focusing lens focus.
The lens assembly according to claim 8, wherein the focusing lens is arranged between the distance measuring module and the mount.
The lens assembly according to claim 9, wherein the control module is specifically used for:

Determine the object distance according to the first distance and the distance between the ranging module and the focusing lens; and determine the second distance according to the distance between the focusing lens and the bayonet and the flange distance , get the image distance;

The driving module is controlled to drive the focusing lens to move along the optical axis of the lens module, so that the result of adding the reciprocal of the object distance and the reciprocal of the image distance is the reciprocal of the focal length.
The lens assembly according to claim 5, wherein the body is provided with a detection module for focus detection;

The control module is also used to receive the detection signal of the detection module through the electronic contact, and control the drive module to drive the focusing lens to move along the optical axis of the lens assembly according to the detection signal to complete focusing .
The lens assembly according to claim 1, further comprising a power supply module for supplying power to the lens assembly.
The lens assembly according to claim 1, further comprising an aperture.
The lens assembly according to claim 1, wherein the ranging module is a time-of-flight (TOF) sensor.
An image acquisition device, comprising a lens assembly and a body, the lens assembly is mounted on the body, the lens assembly includes a focusing lens, it is characterized in that the lens assembly also includes a distance measuring module, a drive module and a control module;

The ranging module is used to measure the first distance between the lens assembly and the focus area in the scene;

The control module is configured to control the driving module according to the first distance, so that the driving module drives the focusing lens to focus.
The image acquisition device according to claim 15, wherein the control module is specifically configured to: perform a focusing operation when a focusing instruction triggered by the lens assembly is received.
The image acquisition device according to claim 16, wherein a control is provided on the lens assembly, and the focusing instruction is triggered by the control.
The image acquisition device according to claim 15, wherein the lens assembly further includes a bayonet, and the lens assembly is engaged with the body of the image acquisition device through the bayonet.
The image acquisition device according to claim 18, wherein an electronic contact is provided on the bayonet, and the lens assembly is electrically connected to the body of the image acquisition device through the electronic contact.
The image acquisition device according to claim 19, wherein the control module is specifically configured to: perform a focusing operation when a focusing instruction triggered by the fuselage is received through the electronic contact.
The image acquisition device according to claim 19, wherein the control module is further configured to receive information carrying a focus position through the electronic contacts.
The image acquisition device according to claim 18, wherein the control module is specifically used for:

Control the driving module according to the focal length of the lens assembly, the first distance, and the second distance between the focusing lens and the image sensor on the body, so that the driving module drives the focusing lens focus.
The image acquisition device according to claim 22, wherein the focusing lens is arranged between the ranging module and the mount.
The image acquisition device according to claim 23, wherein the control module is specifically used for:

Determine the object distance according to the first distance and the distance between the ranging module and the focusing lens; and determine the second distance according to the distance between the focusing lens and the bayonet and the flange distance , get the image distance;

The driving module is controlled to drive the focusing lens to move along the optical axis of the lens module, so that the result of adding the reciprocal of the object distance and the reciprocal of the image distance is the reciprocal of the focal length.
The image acquisition device according to claim 19, wherein the body is provided with a detection module for focus detection;

The control module is also used to receive the detection signal of the detection module through the electronic contact, and control the drive module to drive the focusing lens to move along the optical axis of the lens assembly according to the detection signal to complete focusing .
The image acquisition device according to claim 15, wherein the lens assembly further comprises a power supply module for supplying power to the lens assembly.
The image capture device according to claim 15, wherein the lens assembly further comprises an aperture.
The image acquisition device according to claim 15, wherein the ranging module is a time-of-flight (TOF) sensor.