CN217846780U - Lens system for industrial detection - Google Patents

Abstract

The present application relates to a lens system for industrial inspection, comprising: a solid lens module, a liquid lens module, a lens driving module and a controller; the lens driving module is electrically connected with the liquid lens module and the controller respectively; the solid lens module comprises an eyepiece submodule and an objective submodule; the liquid lens module is positioned between the eyepiece sub-module and the objective sub-module; the controller is used for acquiring the lens imaging condition of the industrial detection system; the lens driving module is used for sending a driving signal to the liquid lens module according to the imaging condition of the lens; the liquid lens module is used for responding to the driving signal and adjusting the focal power of the liquid lens module. The lens system can be adopted to reduce the volume of the lens system and increase the stability of the system.

Description

Lens system for industrial detection

Technical Field

The application relates to the technical field of liquid lenses, in particular to a lens system for industrial detection.

Background

In a machine vision system, a required image is acquired by utilizing an optical imaging principle of a lens, captured contents are transmitted to a computer or other equipment for processing in a data line or wireless communication mode, and the machine vision system is widely applied to the fields of various commercial cash register, express logistics, storage transportation, intelligent manufacturing, defect detection and the like and becomes an important ring of an Internet of things ecosystem. In order to realize clear code reading at different object distances, a motor focusing lens is generally adopted, and when the lens is located at different working object distances, the motor drives the lens to move so as to realize focusing.

Because a motor is needed in the traditional motor focusing lens, the focusing time of a common stepping motor is long, and the traditional motor focusing lens is not suitable for scenes needing to be rapidly identified; the VCM motor has high focusing speed but poor vibration resistance, and in many industrial scenes, the vibration inside the machine is large, and the VCM motor is not durable; the stepping motor and the VCM motor are mechanical devices and have self limitations; however, the conventional C-interface machine vision lens needs to be focused by manually twisting an object distance adjusting ring, and is not suitable for scenes requiring automatic focusing.

Therefore, the lens for machine vision in the prior art has the problem of low use efficiency.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a lens system for industrial inspection. The assembled dot matrix screen has stronger mechanical vibration resistance.

A lens system for industrial inspection, the lens system comprising: a solid lens module, a liquid lens module, a lens driving module and a controller; the lens driving module is respectively electrically connected with the liquid lens module and the controller; the solid lens module comprises an eyepiece submodule and an objective submodule; the liquid lens module is positioned between the eyepiece sub-module and the objective sub-module;

the controller is used for acquiring the lens imaging condition of the industrial detection system;

the lens driving module is used for sending a driving signal to the liquid lens module according to the imaging condition of the lens;

the liquid lens module is used for responding to the driving signal and adjusting the focal power of the liquid lens module.

In the working process of the industrial detection lens system, the imaging condition of the lens of the industrial detection system is obtained based on the controller; the lens driving module sends a driving signal to the liquid lens module according to the imaging condition of the lens; the liquid lens module adjusts the focal power of the liquid lens module in response to the driving signal. Thus, the lens system for industrial detection needs to quickly focus on objects with different object distances; meanwhile, with the expansion of the application range, the object distance range of the use scene is larger and larger. The liquid lens module can play a unique advantage, the curvature of one surface of the liquid lens module can be changed under the action of the lens driving module, when different object distances are focused, the focusing power of the liquid lens module is changed to focus the different object distances, and the focusing power can reach millisecond level, and the liquid lens module is used as an internal component of the lens, so that the structural stability is better than other external mechanical parts, and the mechanical vibration resistance is stronger; meanwhile, the back coke is fixed, other mechanical parts are not needed, the size is reduced, and the stability of the system is also improved.

In one embodiment, the liquid lens module comprises at least two liquid sub-lenses; wherein the size of the liquid sub-lens close to the eyepiece sub-module is smaller than or equal to the size of the liquid sub-lens far from the eyepiece sub-module.

In one embodiment, the content corresponding to each of the liquid sub-lenses in the liquid lens module is a transparent liquid, and the content includes at least liquid water and liquid oil, and when the liquid lens module does not receive the driving signal, a contact surface between the liquid water and the liquid oil protrudes from the liquid water to the liquid oil.

In one embodiment, the liquid lens module has five liquid sub-lenses, wherein in a direction from the objective sub-module to the eyepiece sub-module, a second corresponding liquid sub-lens of the liquid lens module is composed of the liquid water, and a third corresponding liquid sub-lens is composed of the liquid oil.

In one embodiment, the liquid lens module has five liquid sub-lenses, wherein the lens system has a diaphragm unit located at a position corresponding to a third liquid sub-lens of the liquid lens module;

the diaphragm unit is used for limiting the light beam in the optical system, wherein the diaphragm comprises an aperture diaphragm and a field diaphragm.

In one embodiment, an eyepiece submodule and an objective submodule in the solid lens module form a double-gauss structure, and the eyepiece submodule and the objective submodule respectively comprise at least two glass lenses.

In one embodiment, the objective sub-module has four of the glass lenses; the first glass lens has negative diopter from the objective sub-module to the eyepiece sub-module, and the object side surface and the image side surface of the glass lens are convex surfaces; the second glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; the third glass lens has negative diopter, and the object side surface of the glass lens is a concave surface, and the image side surface of the glass lens is a convex surface; the fourth glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; wherein, the convex part is convex towards the object side surface, and the convex part is concave towards the image side surface.

In one embodiment, the eyepiece sub-module has four of the glass lenses; the first glass lens has positive diopter from the objective submodule to the eyepiece submodule, and the object side surface of the glass lens is a convex surface and the image side surface of the glass lens is a concave surface; the second glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; the third glass lens has negative diopter, and the object side surface of the glass lens is a concave surface, and the image side surface of the glass lens is a convex surface; the fourth glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; wherein, the convex part is convex towards the object side surface, and the convex part is concave towards the image side surface.

In one embodiment, the reciprocal of the corresponding relative aperture of the lens system is 5.0, the total optical length is 30 mm, the effective focal length is 8 mm, the optical back focus is 5.4 mm, the imaging target surface is 1/1.8 inch, and the diagonal field angle is 56.7 degrees.

In one embodiment, the surface types of the glass lenses corresponding to the eyepiece sub-module and the objective sub-module and the liquid sub-lenses corresponding to the liquid lens module are spherical.

Drawings

FIG. 1 is a block diagram of a lens system for industrial inspection in one embodiment;

FIG. 2 is an isometric view of a lens structure for industrial inspection in one embodiment;

fig. 3 is a schematic diagram illustrating a specific composition of a liquid lens module in a lens structure for industrial inspection according to an embodiment.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of indicated technical features is significant. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.

To facilitate understanding by those skilled in the art, fig. 1 provides a block diagram of a lens system for industrial inspection; wherein the set of lens systems comprises: a solid lens module 110, a liquid lens module 120, a lens driving module 130, and a controller 140; the lens driving module 130 is electrically connected to the liquid lens module 120 and the controller 140 respectively; the solid lens module 110 includes an eyepiece sub-module and an objective sub-module; the liquid lens module 120 is located between the eyepiece and objective sub-modules.

The controller 140 is configured to obtain a lens imaging condition of the industrial detection system.

The lens driving module 130 is configured to send a driving signal to the liquid lens module 120 according to the lens imaging condition.

Wherein the liquid lens module 120 is configured to adjust an optical power of the liquid lens module 120 in response to the driving signal.

To facilitate understanding by those skilled in the art, fig. 2 provides a schematic view of a lens structure for industrial inspection. As shown in fig. 2, 210 is a first glass lens, 220 is a second glass lens, 230 is a third glass lens, 240 is a fourth glass lens, 250 is a combination of a plurality of sub-liquid lenses, 260 is a fifth glass lens, 270 is a sixth glass lens, 280 is a seventh glass lens, 290 is an eighth glass lens, 2100 is an optical filter, and 2110 is an imaging target surface.

To facilitate understanding by those skilled in the art, fig. 3 provides a schematic diagram of a liquid lens module in a lens structure for industrial inspection, as shown in fig. 3.

In practical application, the controller can be integrated in the lens or externally arranged outside the lens; the processing capacity of the controller can select chips with different processing capacities according to the shooting capacity of the lens, and can also select a server for data calculation.

In practical applications, the lens driving module may output signals related to electricity, such as voltage, current, etc., and by changing the strength of the electrical signal, the intrinsic property of the target object may be changed, for example, the lens driving module acts on the liquid lens module, and the curvature between the contact surfaces in each liquid lens submodule may be changed to change the optical path.

In practical application, the liquid lens module can adopt different ready-made models, and the corresponding liquid lens module can also be designed according to actual requirements. The liquid in the liquid lens module can be at least two kinds of transparent liquid with equal density and different refractive indexes, the transparent liquid in the two adjacent liquid lens sub-modules is different liquid, the separation thin films in the two adjacent liquid lens sub-modules have elasticity, and when an electric signal is input, the liquid can be changed according to the body type change of the liquid.

In the specific implementation, according to the direction of the propagation path of the light, the mounting sequence of the lens system for industrial detection is specifically an objective lens sub-module, a liquid lens module, an eyepiece sub-module, a controller and a lens driving module. The objective lens sub-module and the eyepiece sub-module comprise at least two glass lenses; the liquid lens module comprises at least two liquid lens sub-modules, and the adjacent liquid lens sub-modules are different transparent liquids and are separated by a plasticity separation unit; the controller and the lens driving module can be arranged in the lens or outside the lens, and the controller and the lens driving module can be replaced at will according to the imaging requirement.

According to the technical scheme of the embodiment, after a lens system for industrial detection is started, a target detection object is shot, a controller in the system can detect the imaging condition of the lens of the industrial detection system, and if the imaging condition meets the requirement, a feedback signal is fed back to a lens driving module so as to block the lens driving module from sending an electric signal to a liquid lens module; if the imaging condition does not meet the requirement, an adjusting signal is sent to the lens driving module, the lens driving module can generate a driving electric signal about the adjustment of the liquid lens module according to the imaging condition and the adjusting signal of the lens, and the driving electric signal is used for driving the inherent properties of contents in different liquid lens sub-modules in the liquid lens module to change the light path of the whole lens, so that the requirement is met when the controller detects the image of the imaging target surface.

In the working process of the industrial detection lens system, the imaging condition of the lens of the industrial detection system is obtained based on the controller; the lens driving module sends a driving signal to the liquid lens module according to the imaging condition of the lens; the liquid lens module adjusts the focal power of the liquid lens module in response to the driving signal. Thus, the lens system for industrial detection needs to quickly focus on objects with different object distances; meanwhile, along with the expansion of the application range, the object distance range of the use scene is larger and larger. The liquid lens module can exert unique superiority, the curvature of one surface of the liquid lens module can be changed under the action of the lens driving module, when different object distances are focused, the focusing can be carried out on the different object distances by changing the focal power of the liquid lens module, the millisecond level can be reached, and the liquid lens module is used as an internal component of a lens, so that the structural stability is better than that of other external mechanical components, and the mechanical vibration resistance is stronger; meanwhile, the back coke is fixed, other mechanical parts are not needed, the size is reduced, and the system stability is improved.

In one embodiment, the liquid lens module comprises at least two liquid sub-lenses; wherein the size of the liquid sub-lens close to the eyepiece sub-module is smaller than or equal to the size of the liquid sub-lens far from the eyepiece sub-module.

In specific implementation, the liquid lens module at least comprises two liquid sub-lenses, and the content in each liquid sub-lens is transparent liquid sensitive to an electric signal; for two adjacent liquid sub-lenses, the filling transparent liquid therein is different substances, and generally has different refractive indexes, and for example, may be two kinds of water and oil with equal density and different refractive indexes. Aiming at different liquid sub-lenses, the size of the liquid sub-lens far away from the objective lens is smaller than or equal to that of the liquid sub-lens close to the objective lens, and the different liquid sub-lenses at the same distance with the objective lens are arranged in a superposition mode, wherein the superposition mode can be a mode of vertically superposing, horizontally paralleling, sleeving inside and outside, and the like.

According to the technical scheme of the embodiment, at least two liquid sub-lenses are arranged in the liquid lens module, and each liquid sub-lens can adjust the thickness of transparent liquid according to the input of an electric signal, so that the path of incident light entering through the objective lens sub-module can be changed; due to the change of the shape of the transparent liquid of each liquid sub-lens, the curvature of the contact surface between two adjacent liquid sub-lenses changes, which generally changes the focusing condition and focus of the light beam. The size of the liquid sub-lens close to the objective lens end is slightly larger than that of the liquid sub-lens far from the objective lens end, which is beneficial for forming a whole body between the liquid sub-lenses to change the light path of the same light beam.

In this embodiment, through setting up two piece at least liquid sub-lenses, restricted the size of liquid sub-lens moreover, can the liquid lens module be stronger to the controllability of light path for the change of light path is more accurate, can adapt to different business demands.

In one embodiment, the content corresponding to each of the liquid sub-lenses in the liquid lens module is a transparent liquid, and the content includes at least liquid water and liquid oil, and when the liquid lens module does not receive the driving signal, a contact surface between the liquid water and the liquid oil protrudes from the liquid water to the liquid oil.

In the specific implementation, the filling material in any one of the liquid sub-lenses in the liquid lens module is transparent plastic liquid, and the transparent liquid shows sensitive feedback to the electrical signal, especially the sensitivity of the expansion rate. The two liquid sub-lenses are filled with liquid water and transparent liquid oil, the two liquid sub-lenses are adjacent, and the middle part of the two liquid sub-lenses is divided by an isolating film with strong plasticity. When the liquid lens module does not receive any electric signal, the natural state of the isolation film is that the isolation film protrudes from the liquid sub-lens filled with water to the liquid sub-lens filled with transparent liquid oil, and a certain curvature is kept.

According to the technical scheme, different transparent liquids are filled in the liquid sub-lenses in the liquid lens module, the light path of the incident beam can be well changed through the transparent liquids, and the transparent liquids in the liquid sub-lenses generally have different refractive indexes so as to meet different light path changing requirements. For the two liquid sub-lenses, the fillers are liquid water and transparent liquid oil, the densities of the two liquid sub-lenses are equal, but the refractive indexes of the two liquid sub-lenses are different, and light rays firstly pass through the liquid sub-lenses with the liquid water and then enter the liquid sub-lenses with the transparent liquid oil through the middle isolating films; when the optical path needs to be changed, the electric signals are respectively loaded into the two liquid sub-lenses, and the liquid water and the liquid oil in the two liquid sub-lenses change the respective shapes under the action of voltage, so that the curvature of the isolation film is changed, and the change of the optical path and the change of the focal point are caused.

In this embodiment, through the content that sets up different liquid sub-lenses for different liquid sub-lenses have different refracting indexes, when the loading signal of telecommunication, can change the light path of liquid lens module, and wherein there are two liquid sub-lens's filler to be liquid water and transparent liquid oil, make the light path of liquid lens module change ability stronger, and stability is higher.

In one embodiment, the liquid lens module has five liquid sub-lenses, wherein in a direction from the objective sub-module to the eyepiece sub-module, a corresponding second liquid sub-lens of the liquid lens module is composed of the liquid water, and a corresponding third liquid sub-lens is composed of the liquid oil.

In the concrete implementation, the liquid lens module comprises five liquid sub-lenses in total, any one liquid sub-lens is filled with contents by adopting transparent liquid, and the liquid sub-lens relatively close to the objective lens sub-module is larger than or equal to the liquid sub-lens of the objective lens sub-module based on the relative principle. The liquid sub-lenses of the first, fourth and fifth blocks may be filled with any transparent liquid, the liquid water of the second liquid sub-lens, the transparent liquid oil of the third liquid sub-lens, and the plastic film of the separation film between the liquid sub-lenses of the second and third liquid sub-lenses, which can vary with the body type of the filler.

In the technical solution of this embodiment, each liquid sub-lens in the liquid lens module is filled with a transparent liquid, the second liquid sub-lens is filled with liquid water, and the third liquid sub-lens is filled with transparent liquid oil, and the liquid water and the liquid oil have equal density and unequal refractive index, and after filling, the five liquid sub-lenses are combined into a whole and separated from each other by a separation film. The liquid sub-lenses of the first, fourth, and fifth blocks are not limited to any transparent liquid. For the addition of the electric signal, a voltage is generally applied to the second liquid sub-lens and the third liquid sub-lens, so that the body types of the liquid water and the liquid oil are changed, the curvature of the contact surfaces of the liquid water and the liquid oil is obviously changed, and the purpose of changing the light path is achieved.

Through setting up five liquid sub lens, and second piece liquid sub lens filler is water, and third piece liquid sub lens filler is liquid oil, can reach and change liquid water also liquid oil's size when adding voltage for the curvature of both contact surfaces changes, changes the focus of lens.

In one embodiment, the liquid lens module has five liquid sub-lenses, wherein the lens system has a diaphragm unit located at a position corresponding to a third liquid sub-lens of the liquid lens module; the diaphragm unit is used for limiting the light beam in the optical system, wherein the diaphragm comprises an aperture diaphragm and a field diaphragm.

In specific implementation, five liquid sub-lenses are arranged in the liquid lens module, wherein the position of the third liquid sub-lens is the position of the diaphragm unit corresponding to the whole lens system, and the filler of the third liquid sub-lens is transparent liquid oil, so that the diaphragm unit corresponding to the lens system can be directly formed by adopting liquid oil, and an additional diaphragm original piece can also be added.

According to the technical scheme of the embodiment, according to the requirement of the lens system, the diaphragm unit corresponding to the lens system is arranged on the third liquid sub-lens in the liquid lens module. Because the third liquid sub-lens adopts liquid oil as the filler, the diaphragm corresponding to the lens system can be formed under the action of the electric signal, and the appointed diaphragm original piece can be added according to the requirement, so that the diaphragm correspondingly limits the light beam in the optical system.

In this embodiment, by setting the diaphragm unit to the lens system, a further limiting effect on the light beam entering the lens system can be achieved, and the diaphragm may be an aperture diaphragm or a field diaphragm.

In one embodiment, the eyepiece submodule and the objective submodule in the solid lens module form a double-gauss structure, and the eyepiece submodule and the objective submodule respectively have at least two glass lenses.

In the concrete implementation, the solid lens module comprises an eyepiece submodule and an objective submodule which are respectively positioned at two ends of a lens system, the combination of the two glass lenses is of a double Gaussian structure, the eyepiece submodule or the objective submodule is formed by combining at least two glass lenses, and each glass lens has respective function.

According to the technical scheme of the embodiment, the eyepiece submodule and the objective submodule in the solid lens module both use double-Gaussian structures, and the structures are beneficial to reducing the control freedom degree of a lens system for a large amount of aberration, so that the aberration caused by oblique rays is reduced, and meanwhile, the chromatic aberration can be controlled.

In one embodiment, the objective submodule has four of the glass lenses; the first glass lens has negative diopter from the objective sub-module to the eyepiece sub-module, and the object side surface and the image side surface of the glass lens are convex surfaces; the second glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; the third glass lens has negative diopter, and the object side surface of the glass lens is a concave surface, and the image side surface of the glass lens is a convex surface; the fourth glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; wherein the convex part is convex toward the object side surface and the convex part is concave toward the image side surface.

In a specific implementation, the configuration of the objective submodule is shown as 210-240 in fig. 2. The objective sub-module is composed of a double-gauss structure, and from the objective sub-module to the eyepiece sub-module, there are a first glass lens 210, a second glass lens 220, a third glass lens 230, and a fourth glass lens 240, respectively, wherein the first lens has a negative diopter, the second lens has a positive diopter, the third lens has a negative diopter, and the fourth lens has a positive diopter. An incident light beam enters the lens system from the convex surface of the first glass lens 210, is refracted by the four glass lenses, and exits from the concave surface of the fourth glass lens in the direction close to the eyepiece.

According to the technical scheme of the embodiment, the eyepiece submodule adopts a double-Gaussian structure and inherits the advantages of the structure, so that the first glass lens has negative diopter, and the convex-convex surface combination is favorable for restraining the incident angle of light; the negative and positive diopter combination of the third four glass lenses is beneficial to reducing chromatic aberration.

In the embodiment, the incident angle of the incident light can be effectively restricted and the chromatic aberration can be reduced by adjusting the incident beam through the eyepiece submodule structure formed by adopting the double-Gaussian structure.

In one embodiment, the eyepiece sub-module has four of the glass lenses; the first glass lens has positive diopter from the objective submodule to the eyepiece submodule, and the object side surface of the glass lens is a convex surface and the image side surface of the glass lens is a concave surface; the second glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; the third glass lens has negative diopter, and the object side surface of the glass lens is a concave surface, and the image side surface of the glass lens is a convex surface; the fourth glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; wherein, the convex part is convex towards the object side surface, and the convex part is concave towards the image side surface.

In a specific implementation, the configuration of the objective submodule is shown as 260-290 in fig. 2. The eyepiece sub-module adopts a double-Gaussian structure, and comprises a fifth glass lens 260, a sixth glass lens 270, a seventh glass lens 280 and an eighth glass lens 290 from the eyepiece sub-module to the eyepiece sub-module, wherein the fifth glass lens has positive diopter; the sixth glass lens has positive diopter, and the seventh glass lens has negative diopter; the eighth glass lens has a positive refractive power. The incident light beam enters the eyepiece submodule from the convex surface of the fifth glass lens 260 close to the objective lens, and exits from the convex surface of the eighth glass lens far away from the objective lens through refraction of the four glass lenses.

According to the technical scheme of the embodiment, the diopter combination of the sixth glass lens and the seventh glass lens is beneficial to reducing the vignetting amount of the system, so that the light incoming amount of the marginal field of view is larger, and the illumination of the full field of view is improved. Through optimization, the analytic force of 100lp/mm of a full field of view within an object distance of 500mm-50mm is more than 40%, the analytic force of 50lp/mm of the full field of view within an object distance of 0.1m is more than 50%, and the integral analytic force is good; and the whole distortion is small, the relative illumination is very high, and the method is suitable for most industrial detection scenes.

In the embodiment, the incident light beams are adjusted by the eyepiece submodule structure formed by adopting a double-Gaussian structure, so that the light incoming amount of the marginal field of view is effectively increased, and the illumination of the full field of view is improved.

In one embodiment, the reciprocal of the relative aperture of the lens system is 5.0, the total optical length is 30 mm, the effective focal length is 8 mm, the optical back focus is 5.4 mm, the imaging target surface is 1/1.8 inch, and the diagonal field angle is 56.7 degrees.

In specific implementation, for initial data setting of a lens system, the reciprocal of the relative aperture is 5.0, the total optical length is 30 mm, the effective focal length is 8 mm, the optical back focus is 5.4 mm, the imaging target surface is 1/1.8 inch, and the diagonal field angle is 56.7 degrees.

According to the technical scheme, the reciprocal of the preset relative aperture of the lens system is 5.0, the total optical length is 30 mm, the effective focal length is 8 mm, the optical back focus is 5.4 mm, the imaging target surface is 1/1.8 inch, the diagonal angle of view is 56.7 degrees, incident light beams enter the lens system from the objective sub-module, and clear images are generated on the imaging target surface of the lens system by adjusting the parameters.

In this embodiment, by adjusting the preset parameters of the lens system, a clear image can be generated on the imaging target surface in the lens system.

In one embodiment, the surface types of each glass lens corresponding to the eyepiece sub-module and the objective sub-module and each liquid sub-lens corresponding to the liquid lens module are spherical.

In the specific implementation, at least one surface of each glass lens corresponding to the eyepiece submodule and the objective submodule in the lens system is a spherical surface; since each liquid sub-lens in the liquid lens module can change its body type according to an electrical signal, the surface of each liquid sub-lens is generally a conventional plane, and is not particularly required.

According to the technical scheme, for incident light, the eyepiece submodule, the objective submodule and the liquid lens module are used for adjusting the light path, so that light beams reflected from the shooting surface and entering the lens system can form clear images in the imaging target surface.

In this embodiment, the optical path of the light beam is changed by using a combination of a plurality of curved lenses, so that the imaging target surface can form a clear image.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A lens system for industrial inspection, the lens system comprising: a solid lens module, a liquid lens module, a lens driving module and a controller; the lens driving module is electrically connected with the liquid lens module and the controller respectively; the solid lens module comprises an eyepiece submodule and an objective submodule; the liquid lens module is positioned between the eyepiece sub-module and the objective sub-module;

the controller is used for acquiring the lens imaging condition of the industrial detection system;

the lens driving module is used for sending a driving signal to the liquid lens module according to the imaging condition of the lens;

the liquid lens module is used for responding to the driving signal and adjusting the focal power of the liquid lens module.

2. The lens system of claim 1, wherein the liquid lens module comprises at least two liquid sub-lenses; wherein the size of the liquid sub-lens close to the eyepiece sub-module is smaller than or equal to the size of the liquid sub-lens far from the eyepiece sub-module.

3. The lens system according to claim 2, wherein a content of each of the liquid sub-lenses in the liquid lens module is a transparent liquid, and includes at least liquid water and liquid oil, and when the liquid lens module does not receive the driving signal, a contact surface between the liquid water and the liquid oil protrudes from the liquid water toward the liquid oil.

4. The lens system of claim 3, wherein the liquid lens module has five of the liquid sub-lenses, wherein a corresponding second of the liquid sub-lenses of the liquid lens module is comprised of the liquid water and a corresponding third of the liquid sub-lenses is comprised of the liquid oil in a direction from the objective sub-module to the eyepiece sub-module.

5. The lens system according to claim 3, wherein the liquid lens module has five liquid sub-lenses, and wherein the lens system has a diaphragm unit located at a position corresponding to a third liquid sub-lens of the liquid lens module;

the diaphragm unit is used for limiting the light beam in the optical system, wherein the diaphragm comprises an aperture diaphragm and a field diaphragm.

6. The lens system of claim 1, wherein the eyepiece sub-module and the objective sub-module in the solid lens module form a double gauss-like structure, the eyepiece sub-module and the objective sub-module each having at least two glass lenses.

7. The lens system of claim 6, wherein the objective sub-module has four of the glass lenses; the first glass lens has negative diopter from the objective sub-module to the eyepiece sub-module, and the object side surface and the image side surface of the glass lens are convex surfaces; the second glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; the third glass lens has negative diopter, and the object side surface of the glass lens is a concave surface, and the image side surface of the glass lens is a convex surface; the fourth glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; wherein, the convex part is convex towards the object side surface, and the convex part is concave towards the image side surface.

8. The lens system of claim 6, wherein the eyepiece sub-module has four of the glass lenses; the first glass lens has positive diopter from the objective submodule to the eyepiece submodule, and the object side surface of the glass lens is a convex surface and the image side surface of the glass lens is a concave surface; the second glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; the third glass lens has negative diopter, and the object side surface of the glass lens is a concave surface, and the image side surface of the glass lens is a convex surface; the fourth glass lens has positive diopter, and the object side surface of the glass lens is a convex surface, and the image side surface of the glass lens is a concave surface; wherein the convex part is convex toward the object side surface and the convex part is concave toward the image side surface.

9. The lens system as claimed in claim 1, wherein the reciprocal of the relative aperture of the lens system is 5.0, the total optical length is 30 mm, the effective focal length is 8 mm, the optical back focus is 5.4 mm, the imaging target surface is 1/1.8 inch, and the diagonal field angle is 56.7 degrees.

10. The lens system of claim 9, wherein the surface types of each glass lens corresponding to the eyepiece sub-module and the objective sub-module and each liquid sub-lens corresponding to the liquid lens module are spherical.

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