Adjustable liquid double-telecentric lens and intelligent production equipment

Abstract

The application provides a liquid double-telecentric lens with adjustable focus and intelligent production equipment, and relates to the technical field of optical lenses. The liquid double-telecentric lens with adjustable focus comprises a first lens, a second lens, a third lens, a liquid lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence along an optical axis from an object side to an image side. The first lens is a biconvex lens with positive focal power, the second lens is a biconvex lens with positive focal power, the third lens is a biconcave lens with negative focal power, the fourth lens is a biconcave lens with negative focal power, the fifth lens is a biconvex lens with positive focal power, and the sixth lens is a biconvex lens with positive focal power. The focus position of the liquid double-telecentric lens with adjustable focus is changed by adjusting the driving voltage or driving current of the liquid lens, so that fast focusing under different working distances is completed. The embodiment of the application realizes small volume and excellent imaging quality in a large depth of field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lenses, in particular to a liquid-focusable double-telecentric lens and intelligent production equipment. BACKGROUND

[0002] The telecentric lens is a commonly used lens in the field of machine vision automatic detection. Since the ordinary industrial lens will cause the fluctuation of the magnification when the working distance changes, the accuracy of the measurement result is affected. The original design of the telecentric lens is to correct the parallax problem of the traditional industrial lens. It can keep the magnification of the image constant within a certain working distance range, and will not damage the measurement accuracy due to the change of the height of the object position, so as to realize the high-precision detection of the object.

[0003] However, the depth of field of the existing focus-adjustable telecentric lens is relatively small, which leads to that it can only clearly image within a small working distance range. In addition, the number of lenses of the telecentric lens is generally larger under the same working distance and resolution requirements, which makes the volume of the telecentric lens relatively larger, occupies more space, and thus the cost is relatively higher. SUMMARY

[0004] The embodiment of the present application provides a liquid-focusable double-telecentric lens and intelligent production equipment, so as to realize small volume and excellent imaging quality within a large depth of field.

[0005] In a first aspect, the embodiment of the present application provides a liquid-focusable double-telecentric lens, comprising a first lens, a second lens, a third lens, a liquid lens, a fourth lens, a fifth lens and a sixth lens arranged in order along the optical axis from the object side to the image side.

[0006] The first lens is a biconvex lens with positive focal power, the second lens is a biconvex lens with positive focal power, the third lens is a biconcave lens with negative focal power, the fourth lens is a biconcave lens with negative focal power, the fifth lens is a biconvex lens with positive focal power, and the sixth lens is a biconvex lens with positive focal power.

[0007] Wherein, the focusing position of the liquid-focusable double-telecentric lens is changed by adjusting the driving voltage or driving current of the liquid lens, so as to complete the rapid focusing under different working distances.

[0008] Optionally, the second lens and the third lens are cemented to form a cemented lens; and / or, the fourth lens and the fifth lens are cemented to form a cemented lens.

[0009] Optionally, the parameters of at least two lenses in the first lens, the second lens, the fifth lens and the sixth lens are different.

[0010] And / or,

[0011] The third lens is different from the fourth lens.

[0012] Optionally, the liquid lens has a power P, and the following condition is met: -5dpt≤P≤5dpt.

[0013] Optionally, the working distance of the adjustable-focus liquid double-telecentric lens is D, and the magnification of the adjustable-focus liquid double-telecentric lens is M, and the following conditions are met:

[0014] 124mm≤D≤149mm; and / or, 0.497≤M≤0.511.

[0015] Optionally, a diaphragm is further included, and the diaphragm is located between the third lens and the liquid lens.

[0016] Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses.

[0017] Optionally, the first lens and the second lens are spaced apart, the third lens and the liquid lens are spaced apart, the liquid lens and the fourth lens are spaced apart, and the fifth lens and the sixth lens are spaced apart.

[0018] Optionally, the following conditions are met among the lenses:

[0019] The optical interval between the first lens and the second lens is between 8mm±1mm;

[0020] The optical interval between the third lens and the liquid lens is between 49mm±1mm;

[0021] The optical interval between the liquid lens and the fourth lens is between 7mm±1mm;

[0022] The optical interval between the fifth lens and the sixth lens is between 0.2mm±0.1mm.

[0023] Optionally, the following conditions are met among the lenses:

[0024] The radius of curvature of the object side surface of the first lens is 116mm±2mm, and the radius of curvature of the image side surface of the first lens is -84mm±2mm;

[0025] The radius of curvature of the object side surface of the second lens is 46mm±2mm, and the radius of curvature of the image side surface of the second lens is -50mm±2mm;

[0026] A radius of curvature of an object side surface of the third lens is -50mm±2mm, and a radius of curvature of an image side surface of the third lens is 600mm±2mm;

[0027] A radius of curvature of an object side surface of the fourth lens is -9mm±2mm, and a radius of curvature of an image side surface of the fourth lens is 25mm±2mm;

[0028] A radius of curvature of an object side surface of the fifth lens is 25mm±2mm, and a radius of curvature of an image side surface of the fifth lens is -13mm±2mm;

[0029] A radius of curvature of an object side surface of the sixth lens is 39mm±2mm, and a radius of curvature of an image side surface of the sixth lens is -47mm±2mm.

[0030] Optionally, each lens satisfies at least one of the following conditions:

[0031] A refractive index of the first lens is 1.5±0.1, and an Abbe number of the first lens is 81.5±1;

[0032] A refractive index of the second lens is 1.5±0.1, and an Abbe number of the second lens is 81.5±1;

[0033] A refractive index of the third lens is 1.6±0.1, and an Abbe number of the third lens is 35.7±1;

[0034] A refractive index of the fourth lens is 1.6±0.1, and an Abbe number of the fourth lens is 37±1;

[0035] A refractive index of the fifth lens is 1.5±0.1, and an Abbe number of the fifth lens is 56±1;

[0036] A refractive index of the sixth lens is 1.7±0.1, and an Abbe number of the sixth lens is 52.3±1.

[0037] In a second aspect, an embodiment of the present application provides an intelligent production equipment, comprising the adjustable-focus liquid double-telecentric lens of the first aspect.

[0038] The embodiment of the present application provides a liquid focus tunable double telecentric lens, through the surface setting, specific arrangement mode and radius of curvature setting of the first lens to the sixth lens, and the refractive power setting of the liquid lens in the liquid focus tunable double telecentric lens, the lens can be ensured to be small in size, and still has excellent imaging quality in a large depth of field. Through the above setting, the liquid focus tunable double telecentric lens provided by the embodiment of the present application can realize a large depth of field of 25mm, which is much higher than that of an ordinary liquid focus tunable double telecentric lens. In addition, by adjusting the driving voltage or driving current of the liquid lens, the focusing position of the liquid focus tunable double telecentric lens can be changed, rapid focusing under different working distances is completed, and the precision and efficiency of machine vision detection are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a light path principle diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application;

[0040] Figure 2 is a structure schematic diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application;

[0041] Figure 3 is a field curvature diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149mm;

[0042] Figure 4 is a distortion diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149mm;

[0043] Figure 5 is an optical transfer function diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149mm;

[0044] Figure 6 is an image plane relative luminance diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149mm;

[0045] Figure 7 is a point column diagram of the liquid focus tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149mm;

[0046] Figure 8 is a field curvature diagram of the liquid focus tunable double telecentric lens provided by the embodiment two of the present application at a working distance of 124mm;

[0047] Figure 9 is a distortion diagram of the liquid focus tunable double telecentric lens provided by the embodiment two of the present application at a working distance of 124mm;

[0048] Figure 10The optical transfer function diagram of the adjustable-focus liquid double-telecentric lens provided in the second embodiment of the present application at a working distance of 124mm is as follows:

[0049] Figure 11 The relative-illuminance diagram of the adjustable-focus liquid double-telecentric lens provided in the second embodiment of the present application at a working distance of 124mm is as follows:

[0050] Figure 12 The point-column diagram of the adjustable-focus liquid double-telecentric lens provided in the second embodiment of the present application at a working distance of 124mm is as follows. DETAILED DESCRIPTION

[0051] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the present application, but not for the limitation of the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0052] Embodiment 1

[0053] Figure 1 is the optical path principle diagram of the adjustable-focus liquid double-telecentric lens provided in the first embodiment of the present application, Figure 2 is the structural schematic diagram of the adjustable-focus liquid double-telecentric lens provided in the first embodiment of the present application, referring to Figure 1 and Figure 2 The adjustable-focus liquid double-telecentric lens comprises, in order along the optical axis from the object side to the image side, a first lens 1, a second lens 2, a third lens 3, a liquid lens 8, a fourth lens 4, a fifth lens 5 and a sixth lens 6. The above-mentioned lenses all have an object side surface facing the object side (i.e. the object side, the object plane OBJ) and an image side surface facing the image side (i.e. the image side, the image plane IMG), the above-mentioned lenses are coaxially arranged, and the common axis of the lenses is the optical axis of the adjustable-focus liquid double-telecentric lens.

[0054] The first lens 1 is a biconvex lens with positive focal power, the first lens 1 has positive focal power, the object side surface R11 of the first lens 1 is a convex surface, and the image side surface R12 of the first lens 1 is a convex surface. The second lens 2 is a biconvex lens with positive focal power, the second lens 2 has positive focal power, the object side surface R21 of the second lens 2 is a convex surface, and the image side surface R22 of the second lens 2 is a convex surface. The third lens 3 is a biconcave lens with negative focal power, the third lens 3 has negative focal power, the object side surface R31 of the third lens 3 is a concave surface, and the image side surface R32 of the third lens 3 is a concave surface. The fourth lens 4 is a biconcave lens with negative focal power, the fourth lens 4 has negative focal power, the object side surface R41 of the fourth lens 4 is a concave surface, and the image side surface R42 of the fourth lens 4 is a concave surface. The fifth lens 5 is a biconvex lens with positive focal power, the fifth lens 5 has positive focal power, the object side surface R51 of the fifth lens 5 is a convex surface, and the image side surface R52 of the fifth lens 5 is a convex surface. The sixth lens 6 is a biconvex lens with positive focal power, the sixth lens 6 has positive focal power, the object side surface R61 of the sixth lens 6 is a convex surface, and the image side surface R62 of the sixth lens 6 is a convex surface.

[0055] By adjusting the driving voltage or driving current of the liquid lens 8, the focal length of the liquid lens 8 is changed, the focusing position of the adjustable focus liquid double telecentric lens is changed, and fast focusing under different working distances is completed. The adjustable focus liquid double telecentric lens can clearly image in a wide working distance range.

[0056] The embodiment of the present application provides an adjustable focus liquid double telecentric lens. By setting the surface type of the first lens 1 to the sixth lens 6, the specific arrangement mode and the focal power, and cooperating with the position setting of the liquid lens 8 in the adjustable focus liquid double telecentric lens, the lens can still have excellent imaging quality in a large depth of field while ensuring a small volume. The adjustable focus liquid double telecentric lens is a focus adjustable lens. Through the above setting, the adjustable focus liquid double telecentric lens provided by the embodiment of the present application can realize a large depth of field of 25mm, which is much higher than that of an ordinary adjustable focus liquid double telecentric lens. In addition, by adjusting the driving voltage or driving current of the liquid lens 8, the focusing position of the adjustable focus liquid double telecentric lens is changed, and fast focusing under different working distances is completed, thereby further improving the precision and efficiency of machine vision detection.

[0057] Exemplarily, under different working distances, by adjusting the driving voltage or driving current of the liquid lens 8, the liquid part interface in the liquid lens 8 has different curvature radii, and automatic focusing under different working distances is realized. As an example, the focal power range of the liquid lens 8 is-5dpt~+5dpt, and high-definition imaging under a working distance of 124mm~149mm can be realized.

[0058] Exemplarily, the liquid lens 8 is sequentially arranged with the first liquid part and the second liquid part along the optical axis direction. The adjustable focus liquid double telecentric lens further comprises a controllable power supply, and the controllable power supply and the liquid lens 8 constitute a liquid lens module. The positive electrode of the controllable power supply is connected to the first liquid part, the negative electrode of the controllable power supply is connected to the second liquid part, and there is an interface between the first liquid part and the second liquid part. The controllable power supply provides a set voltage between the first liquid part and the second liquid part, so as to change the shape of the interface between the first liquid part and the second liquid part, change the focal length of the liquid lens 8, and realize the automatic focusing of the adjustable focus liquid double telecentric lens.

[0059] Optionally, with reference to Figure 2 , the second lens 2 and the third lens 3 are cemented to form a cemented lens. The fourth lens 4 and the fifth lens 5 are cemented to form a cemented lens. The cemented lens has the effect of eliminating chromatic aberration. In the embodiment of the present application, two cemented lenses are provided, which have a good effect of eliminating chromatic aberration. In other embodiments, the second lens 2 and the third lens 3 can be cemented to form a cemented lens, and the fourth lens 4 and the fifth lens 5 are not cemented. Alternatively, the fourth lens 4 and the fifth lens 5 are cemented to form a cemented lens, and the second lens 2 and the third lens 3 are not cemented.

[0060] Optionally, the parameters of at least two lenses of the first lens 1, the second lens 2, the fifth lens 5 and the sixth lens 6 are different. And / or, the third lens 3 is different from the fourth lens 4. The third lens 3 and the fourth lens 4 have different parameters.

[0061] Optionally, with reference to Figure 2 , the optical power of the liquid lens 8 is P, which satisfies: -5dpt≤P≤5dpt.

[0062] Further, the working distance of the adjustable focus liquid double telecentric lens is D, and the magnification of the adjustable focus liquid double telecentric lens is M, which satisfies: 124mm≤D≤149mm; and / or, 0.497≤M≤0.511.

[0063] Exemplarily, when the optical power of the liquid lens 8 is adjusted to +5dpt, the corresponding working distance of the adjustable focus liquid double telecentric lens is 124mm; when the optical power of the liquid lens 8 is adjusted to 0dpt, the corresponding working distance of the adjustable focus liquid double telecentric lens is 137mm; when the optical power of the liquid lens 8 is adjusted to -5dpt, the corresponding working distance of the adjustable focus liquid double telecentric lens is 149mm, so according to the different voltages of the driving, the optical power of the liquid lens 8 is changed, and in other words, the depth of field range of the adjustable focus liquid double telecentric lens is increased.

[0064] Exemplarily, the object-side telecentricity of the liquid-focusable dual-telecentric lens satisfies: the object-side telecentricity is greater than or equal to 0° and less than or equal to 0.1°.

[0065] Optionally, referring to Figure 2 The liquid-focusable dual-telecentric lens further comprises a diaphragm 7 located between the third lens 3 and the liquid lens 8. The main function of the diaphragm 7 is to limit the light aperture of the light beam. It should be noted that the plurality of lenses before the diaphragm 7 and the plurality of lenses after the diaphragm 7 constitute an approximately symmetric structure. For example, three lenses, i.e., the first lens 1, the second lens 2 and the third lens 3, are arranged before the diaphragm 7. Three lenses, i.e., the fourth lens 4, the fifth lens 5 and the sixth lens 6, are arranged after the diaphragm 7. The first lens 1 and the sixth lens 6 correspond to each other, the second lens 2 and the third lens 3 are bonded to form a bonded lens, which corresponds to the fourth lens 4 and the fifth lens 5 bonded to form a bonded lens. The approximately symmetric structure is conducive to eliminating aberrations, eliminating astigmatism and coma.

[0066] Optionally, referring to Figure 2 The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all glass spherical lenses.

[0067] Exemplarily, the total optical length of the liquid-focusable dual-telecentric lens is TTL, and the TTL is less than or equal to 116.4 mm. By setting the TTL to be less than or equal to 116.4 mm, the total optical length of the liquid-focusable dual-telecentric lens is reduced, the volume of the liquid-focusable dual-telecentric lens is reduced, and the miniaturization of the liquid-focusable dual-telecentric lens is realized.

[0068] Optionally, referring to Figure 2 The first lens 1 and the second lens 2 are arranged with a spacing, the third lens 3 and the liquid lens 8 are arranged with a spacing, the liquid lens 8 and the fourth lens 4 are arranged with a spacing, and the fifth lens 5 and the sixth lens 6 are arranged with a spacing. There is a certain spacing between the two lenses arranged with a spacing.

[0069] Optionally, referring to Figure 2 The optical spacing between the first lens 1 and the second lens 2 is between 8 mm±1 mm; the optical spacing between the third lens 3 and the liquid lens 8 is between 49 mm±1 mm; the optical spacing between the liquid lens 8 and the fourth lens 4 is between 7 mm±1 mm; and the optical spacing between the fifth lens 5 and the sixth lens 6 is between 0.2 mm±0.1 mm.

[0070] Optionally, referring to Figure 2, each lens satisfies at least one of the following conditions: the radius of curvature of the object side surface of the first lens 1 is 116 mm ± 2 mm, the radius of curvature of the image side surface of the first lens 1 is -84 mm ± 2 mm; the radius of curvature of the object side surface of the second lens 2 is 46 mm ± 2 mm, the radius of curvature of the image side surface of the second lens 2 is -50 mm ± 2 mm; the radius of curvature of the object side surface of the third lens 3 is -50 mm ± 2 mm, the radius of curvature of the image side surface of the third lens 3 is 600 mm ± 2 mm; the radius of curvature of the object side surface of the fourth lens 4 is -9 mm ± 2 mm, the radius of curvature of the image side surface of the fourth lens 4 is 25 mm ± 2 mm; the radius of curvature of the object side surface of the fifth lens 5 is 25 mm ± 2 mm, the radius of curvature of the image side surface of the fifth lens 5 is -13 mm ± 2 mm; the radius of curvature of the object side surface of the sixth lens 6 is 39 mm ± 2 mm, the radius of curvature of the image side surface of the sixth lens 6 is -47 mm ± 2 mm.

[0071] Optionally, with reference to Figure 2 , each lens satisfies at least one of the following conditions: the refractive index of the first lens 1 is 1.5 ± 0.1, the Abbe number of the first lens 1 is 81.5 ± 1; the refractive index of the second lens 2 is 1.5 ± 0.1, the Abbe number of the second lens 2 is 81.5 ± 1; the refractive index of the third lens 3 is 1.6 ± 0.1, the Abbe number of the third lens 3 is 35.7 ± 1; the refractive index of the fourth lens 4 is 1.6 ± 0.1, the Abbe number of the fourth lens 4 is 37 ± 1; the refractive index of the fifth lens 5 is 1.5 ± 0.1, the Abbe number of the fifth lens 5 is 56 ± 1; the refractive index of the sixth lens 6 is 1.7 ± 0.1, the Abbe number of the sixth lens 6 is 52.3 ± 1.

[0072] Table 1 shows a design value of the adjustable-focus liquid double-telecentric lens in Example 1, and the specific numerical value can be adjusted according to product requirements, which is not a limitation on the embodiments of the present application. The adjustable-focus liquid double-telecentric lens shown in Table 1 can be

[0073]

[0074] Table 1 shows a design value of the adjustable-focus liquid double-telecentric lens in Example 1, and the specific numerical value can be adjusted according to product requirements, which is not a limitation on the embodiments of the present application. The adjustable-focus liquid double-telecentric lens shown in Table 1 can be Figure 1 and Figure 2A lens generally includes two surfaces, each of which is a refractive surface. The surface numbers in Table 1 are numbered according to the surface order of each lens. Among them, surface number 1 represents the front surface (i.e. the object side surface) of the first lens 1, surface number 2 represents the rear surface (i.e. the image side surface) of the first lens 1, and so on, which will not be described here. The units of the curvature radius, thickness and focal length are all mm. The curvature radius represents the bending degree of the corresponding lens surface, a positive value represents that the surface is bent towards the image side IMG, and a negative value represents that the surface is bent towards the object side. Among them, infinity represents that the surface is a plane, and the curvature radius is infinite. The thickness represents the center axial distance from the current surface to the next surface. The refractive index represents the deflection ability of the material between the current surface and the next surface to the light, and the space represents the current position is air, and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light, and the space represents the current position is air.

[0075] Exemplarily, in embodiment one, the working F number of the liquid tunable double telecentric lens is 11, the total optical length is 116.4 mm, the working distance is 149 mm, the working waveband is 480 nm-650 nm, the maximum supported camera target surface is 2 / 3″, and the magnification is 0.5 times.

[0076] Figure 3 The field curvature graph of the liquid tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149 mm is shown in FIG. 6, and the reference is Figure 4 The distortion graph of the liquid tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149 mm is shown in FIG. 7, and the reference is Figure 3 And Figure 4 It can be seen that the optical distortion is less than 0.25%, which indicates that the field edge distortion of the liquid tunable double telecentric lens is very small, and the picture is clear and not deformed.

[0077] Figure 5 The optical transfer function graph of the liquid tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149 mm is shown in FIG. 8, and the reference is Figure 5 It can be seen that the modulation transfer function of the liquid tunable double telecentric lens is higher than 0.4 at 50 lp / mm in the full field of view, and the overall resolution is very good.

[0078] Figure 6 The image surface relative luminance graph of the liquid tunable double telecentric lens provided by the embodiment one of the present application at a working distance of 149 mm is shown in FIG. 9, and the reference is Figure 6 It can be seen that the relative luminance is above 0.98 in the full field of view, which indicates that the picture brightness uniformity of each field of view of the liquid tunable double telecentric lens is very high.

[0079] Figure 7The point array diagram of the adjustable-focus liquid double-telecentric lens provided by the embodiment one has a working distance of 149mm, and the field curvature diagram is shown in Figure 1. Figure 7 It can be seen from the diagram that the aberration of each field of view is within the Airy disk, which indicates that the image quality of the adjustable-focus liquid double-telecentric lens is close to the diffraction limit, and the imaging quality is excellent.

[0080] Embodiment two

[0081] The similarities with the above embodiment are not repeated. In this embodiment, the lens used is the same as that in the embodiment one, but the optical power of the liquid lens 8 is changed, and other parameters such as the curvature radius, thickness and air gap of each lens are the same.

[0082] Table 2: Design values of the adjustable-focus liquid double-telecentric lens in the embodiment two

[0083]

[0084] Exemplarily, in the embodiment two, the working F number of the adjustable-focus liquid double-telecentric lens is 11, the total optical length is 116.4mm, the working distance is 124mm, the working waveband is 480nm-650nm, the maximum supported camera is a 2 / 3" target surface, and the magnification is 0.5 times.

[0085] Figure 8 The field curvature diagram of the adjustable-focus liquid double-telecentric lens provided by the embodiment two has a working distance of 124mm, and the field curvature diagram is shown in Figure 2. Figure 9 The distortion diagram of the adjustable-focus liquid double-telecentric lens provided by the embodiment two has a working distance of 124mm, and the distortion diagram is shown in Figure 3. Figure 8 And Figure 9 It can be seen that the optical distortion is less than 0.3%, which indicates that the edge distortion of the adjustable-focus liquid double-telecentric lens is very small, and the picture is clear and not deformed.

[0086] Figure 10 The optical transfer function diagram of the adjustable-focus liquid double-telecentric lens provided by the embodiment two has a working distance of 124mm, and the optical transfer function diagram is shown in Figure 4. Figure 10 It can be seen that the modulation transfer function of the adjustable-focus liquid double-telecentric lens is higher than 0.4 at 50lp / mm, and the overall resolution is very good.

[0087] Figure 11 The image surface relative luminance diagram of the adjustable-focus liquid double-telecentric lens provided by the embodiment two has a working distance of 124mm, and the image surface relative luminance diagram is shown in Figure 5. Figure 11 It can be seen that the relative luminance is above 0.98 in the full field of view, which indicates that the picture brightness uniformity of each field of view of the adjustable-focus liquid double-telecentric lens is very high.

[0088] Figure 12The liquid double-telecentric lens provided in the second embodiment of the present application has a point array diagram at a working distance of 124mm, and the reference Figure 12 As can be seen from the diagram, the aberration of each field of view is within the Airy disk, which indicates that the image quality of the liquid double-telecentric lens is close to the diffraction limit, and the imaging quality is excellent.

[0089] The third embodiment

[0090] The embodiment of the present application also provides an intelligent production equipment, and the intelligent production equipment comprises the liquid double-telecentric lens in any of the above embodiments. Therefore, the intelligent production equipment has the beneficial effects of the liquid double-telecentric lens in the above embodiments, that is, the liquid double-telecentric lens can ensure a small volume and still has excellent imaging quality in a large depth of field. Therefore, the precision and efficiency of visual detection of the intelligent production equipment are improved.

[0091] Exemplarily, the intelligent production equipment comprises a dispensing machine, a coating machine, a plasma cleaning machine, an assembly machine, a screw machine and the like.

[0092] The plasma cleaning machine is also called a plasma surface treatment instrument, which is a brand-new high-tech technology that uses plasma to achieve effects that cannot be achieved by conventional cleaning methods. Plasma is a state of matter, also known as the fourth state of matter, and does not belong to the three states of solid, liquid and gas. The gas is ionized by applying sufficient energy to become a plasma state. The 'active' components of the plasma include ions, electrons, atoms, active groups, excited-state nuclei (metastable state), photons, etc. The plasma cleaning machine processes the sample surface by using the properties of these active components to achieve cleaning, coating and other purposes.

[0093] The dispensing machine is used for encapsulation dispensing.

[0094] The coating machine is used for coating products, for example, can be used for coating PCB boards in the electronic industry, so that the coated PCB board can be dustproof and waterproof.

[0095] The assembly machine is used for assembling products. For example, the flexible circuit board is assembled to the bottom of the panel by using the assembly machine.

[0096] The screw machine can automatically lock the screw on the product.

[0097] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications, combinations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A focusable liquid dual telecentric lens, characterized in that, It consists of a first lens, a second lens, a third lens, a liquid lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side; The first lens is a biconvex lens with positive optical power, the second lens is a biconvex lens with positive optical power, the third lens is a biconcave lens with negative optical power, the fourth lens is a biconcave lens with negative optical power, the fifth lens is a biconvex lens with positive optical power, and the sixth lens is a biconvex lens with positive optical power. The focusing position of the adjustable focus liquid dual telecentric lens can be changed by adjusting the driving voltage or driving current of the liquid lens, thereby achieving fast focusing at different working distances. The second lens and the third lens are cemented together to form a cemented lens; The fourth lens and the fifth lens are cemented together to form a cemented lens; Each lens satisfies the following conditions: The radius of curvature of the object side of the first lens is 116mm±2mm, and the radius of curvature of the image side of the first lens is -84mm±2mm. The radius of curvature of the object side of the second lens is 46mm±2mm, and the radius of curvature of the image side of the second lens is -50mm±2mm. The object-side radius of curvature of the third lens is -50mm±2mm, and the image-side radius of curvature of the third lens is 600mm±2mm. The radius of curvature of the object side of the fourth lens is -9mm±2mm, and the radius of curvature of the image side of the fourth lens is 25mm±2mm. The radius of curvature of the object side of the fifth lens is 25mm ± 2mm, and the radius of curvature of the image side of the fifth lens is -13mm ± 2mm. The object-side radius of curvature of the sixth lens is 39mm ± 2mm, and the image-side radius of curvature of the sixth lens is -47mm ± 2mm.

2. The adjustable-focus liquid dual-telecentric lens according to claim 1, characterized in that, The optical power of the liquid lens is P, which satisfies: -5dpt≤P≤5dpt.

3. The adjustable-focus liquid dual telecentric lens according to claim 2, characterized in that, The working distance of the adjustable-focus liquid dual telecentric lens is D, and the magnification of the adjustable-focus liquid dual telecentric lens is M, satisfying: 124mm≤D≤149mm; and / or, 0.497≤M≤0.

511.

4. The adjustable-focus liquid dual-telecentric lens according to claim 1, characterized in that, It also includes an aperture stop, which is located between the third lens and the liquid lens.

5. The adjustable-focus liquid dual-telecentric lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses.

6. The adjustable-focus liquid dual-telecentric lens according to claim 1, characterized in that, The first lens and the second lens are spaced apart, the third lens and the liquid lens are spaced apart, the liquid lens and the fourth lens are spaced apart, and the fifth lens and the sixth lens are spaced apart.

7. The adjustable-focus liquid dual-telecentric lens according to claim 6, characterized in that, Each lens satisfies at least one of the following conditions: The optical spacing between the first lens and the second lens is between 8mm and 1mm; The optical distance between the third lens and the liquid lens is between 49mm ± 1mm; The optical distance between the liquid lens and the fourth lens is between 7mm and 1mm; The optical spacing between the fifth lens and the sixth lens is between 0.2 mm and 0.1 mm.

8. The adjustable-focus liquid dual telecentric lens according to claim 1, characterized in that, Each lens satisfies at least one of the following conditions: The refractive index of the first lens is 1.5±0.1, and the Abbe number of the first lens is 81.5±1; The refractive index of the second lens is 1.5±0.1, and the Abbe number of the second lens is 81.5±1; The refractive index of the third lens is 1.6±0.1, and the Abbe number of the third lens is 35.7±1; The refractive index of the fourth lens is 1.6±0.1, and the Abbe number of the fourth lens is 37±1. The refractive index of the fifth lens is 1.5±0.1, and the Abbe number of the fifth lens is 56±1. The refractive index of the sixth lens is 1.7±0.1, and the Abbe number of the sixth lens is 52.3±1.

9. An intelligent production equipment, characterized in that, Including the adjustable focus liquid dual telecentric lens as described in any one of claims 1-8.

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