Industrial endoscope zoom lens

Abstract

The utility model discloses a zoom lens of an industrial endoscope, and belongs to the field of shooting lenses of industrial endoscopes. The lens is provided with ten lenses including one single-face concave lens, one double-face convex lens, two single-face convex lenses, two concave-convex lenses and four plane lenses, the positions of all the lenses are reasonable, imaging is clear, stable and reliable, the imaging performance is excellent, focusing is rapid and stable, and the lens is suitable for industrial automatic endoscopes. According to the device, the two plane lenses are curvature adjusting lenses, the curvature of the lenses can be adjusted by electrifying, and the focal length and the light refraction path are influenced through curvature change, so that the focus position is dynamically adjusted or the aberration of an optical system is compensated, and the imaging flexibility and quality of the lenses are improved; meanwhile, the diaphragm is further arranged between the fifth lens and the sixth lens, aberration (such as spherical aberration and coma aberration) and light spots in the optical system can be reduced, the resolution ratio and imaging definition of the optical system are improved, and meanwhile the diaphragm can effectively control the view field range of the system.

Description

TECHNICAL FIELD

[0001] The utility model relates to an industrial endoscope zoom lens belongs to the field of shooting lens of industrial endoscope. BACKGROUND

[0002] Industrial lens as important accessories of machine vision in industrial automation needs to have stable and reliable structure and excellent imaging performance. With the rapid development of industrial automation, the market has higher requirements for the imaging performance and structural stability of industrial lens. The industrial lens in the prior art cannot meet the development needs of automation equipment more and more, therefore the existing industrial lens still has the following defects: 1, the imaging effect is poor;2, the focusing efficiency is low, and the focusing is unstable;3, the imaging range is small.

[0003] To meet the high-end needs of such automation industry in the market, the present application has developed an industrial endoscope zoom lens. UTILITY MODEL CONTENTS

[0004] The utility model discloses an industrial endoscope zoom lens, which can effectively solve the above problems.

[0005] To solve the above technical problems, the utility model is realized through the following technical schemes:

[0006] It comprises first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens and photosensitive chip arranged in sequence from left to right;

[0007] The first lens, fourth lens, seventh lens and tenth lens are plane mirrors;The second lens is a concave lens;The third lens, fifth lens and eighth lens are convex lenses;The sixth lens and ninth lens are concave-convex lenses;

[0008] The right end face of the second lens is a concave surface, the left and right end faces of the third lens and the fifth lens are convex surfaces, and the convex height of the left end face is less than that of the right end face;The left and right end faces of the eighth lens are symmetrically convex convex surfaces;The left end face of the sixth lens and the ninth lens is a concave surface, and the right end face is a convex surface.

[0009] Further, a diaphragm is arranged between the fifth lens and the sixth lens, and a first spacer ring is arranged between the diaphragm and the fifth lens.

[0010] Further, a second spacer ring is arranged between the seventh lens and the eighth lens.

[0011] Further, the shell assembly includes an inner shell for mounting the fifth lens and the sixth lens; a first outer shell for mounting the first lens, the second lens, and the third lens; a second outer shell for mounting the eighth lens, the ninth lens, and the tenth lens; and a third outer shell for mounting the photosensitive chip; the fourth lens is mounted between the first outer shell and the inner shell, and the seventh lens is mounted between the second outer shell and the inner shell.

[0012] Further, the first outer shell is internally provided with a first limiting ring, the third lens is in contact with the first limiting ring; the second outer shell is internally provided with a second limiting ring, the ninth lens is in contact with the second limiting ring, and the second outer shell is internally provided with a mounting ring groove, and the tenth lens is fixed in the mounting ring groove.

[0013] Further, the first outer shell is provided with a first through groove, and the second outer shell is provided with a second through groove; the first through groove is provided with a first circuit board, one end of the first circuit board is connected with a first conductive plate, and the first circuit board is arranged between the fourth lens and the inner shell; the second through groove is provided with a second circuit board, one end of the second circuit board is connected with a second conductive plate, and the second circuit board is arranged between the inner shell and the seventh lens.

[0014] As preferred, the optical glass brand of the second lens is H-ZLaf4LA, the diameter of the second lens is 2.9.00-0.01 / -0.025mm, the center thickness is 0.292+0.02mm, the radius of the left end circular arc surface of the second lens is INFINITY +0.1mm, and the radius of the right end circular arc surface of the second lens is 1.346±0.1mm.

[0015] As preferred, the optical glass brand of the third lens is H-ZF52, the diameter of the third lens is 2.9.00-0.01 / -0.025mm, the center thickness is 0.692+0.02mm, the radius of the left end circular arc surface of the third lens is 12.17929 +0.1mm, and the radius of the right end circular arc surface of the third lens is -2.73711±0.1mm.

[0016] As preferred, the optical glass brand of the fifth lens is H-QK3L, the diameter of the fifth lens is 1.800-0.01 / -0.025mm, the center thickness is 0.509+0.02mm, the radius of the left end circular arc surface of the fifth lens is 10.17517 +0.1mm, and the radius of the right end circular arc surface of the fifth lens is -1.43372±0.1mm.

[0017] Preferably, the optical glass of the sixth lens is of grade H-K9L, the diameter of the sixth lens is 1.800-0.01 / -0.025mm, the center thickness is 0.148+0.02mm, the radius of the left end arc surface of the sixth lens is -1.0061+0.1mm, and the radius of the right end arc surface of the sixth lens is -1.16108±0.1mm.

[0018] Preferably, the optical glass of the seventh lens is H-LaK52, the diameter of the seventh lens is 2.700-0.01 / -0.025mm, the center thickness is 0.65+0.02mm, the radius of the left end arc surface of the seventh lens is 3.709841+0.1mm, and the radius of the right end arc surface of the seventh lens is -3.70984±0.1mm.

[0019] Preferably, the optical glass of the eighth lens is H-LaK52, the diameter of the eighth lens is 2.700-0.01 / -0.025mm, the center thickness is 0.22+0.02mm, the radius of the left end arc surface of the eighth lens is -1.46254+0.1mm, and the radius of the right end arc surface of the eighth lens is -4.478±0.1mm.

[0020] Preferably, the first lens is sapphire and the tenth lens is an IR filter.

[0021] The beneficial effects are:

[0022] This lens has a total of ten lenses, including one single-sided concave lens, one double-sided convex lens, two single-sided convex lenses, two concave-convex lenses, and four plane lenses. The positions of each lens are reasonably set, resulting in clear, stable, and reliable imaging with excellent imaging performance and fast and stable focusing. It is particularly suitable for machine vision mechanisms in industrial automation.

[0023] Two of the plane lenses in this device are curvature-adjustable lenses, which can be electrically adjusted to change their curvature. By changing the curvature, the focal length and light refraction path are affected, thereby dynamically adjusting the focal position or compensating for aberrations in the optical system, improving the imaging flexibility and quality of the lens. At the same time, an aperture stop is set between the fifth and sixth lenses, which can reduce aberrations (such as spherical aberration and coma) and spot in the optical system, thereby improving the resolution and image sharpness of the optical system. The aperture stop can also effectively control the field of view of the system. Attached Figure Description

[0024] For ease of explanation, this utility model is described in detail below with reference to the specific embodiments and accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 is a sectional view of the utility model;

[0027] Figure 3 is a sectional view of the utility model;

[0028] Figure 4 is an exploded view of the lens of the utility model;

[0029] Figure 5 is a parts view of the lens of the utility model;

[0030] Figure 6 is an optical path diagram of the utility model.

[0031] Explanation of reference signs:

[0032] 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, seventh lens; 8, eighth lens; 9, ninth lens; 10, tenth lens; 11, photosensitive chip; 12, first spacer ring; 13, diaphragm; 14, second spacer ring; 15, shell assembly; 151, inner shell; 152, first outer shell; 153, second outer shell; 154, third outer shell; 155, first limiting ring; 156, second limiting ring; 16, first through slot; 17, second through slot; 18, first circuit board; 19, second circuit board; 20, first conductive plate; 21, second conductive plate. DETAILED DESCRIPTION

[0033] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0034] It should be noted that in the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more than two; the directions or position relations indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated devices or elements must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as a limitation of the utility model.

[0035] In addition, the terms "first", "second", "third" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance.

[0036] Meanwhile, in the description of the utility model, unless another explicit provision and limitation, the term "connected", "connection" should be broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium.

[0037] Reference Figures 1-6 For an embodiment of the utility model of an industrial endoscope zoom lens,

[0038] Comprise first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7, eighth lens 8, ninth lens 9, tenth lens 10, photosensitive chip 11 arranged in order from left to right;

[0039] First lens 1, fourth lens 4, seventh lens 7, tenth lens 10 are plane mirrors;Second lens 2 is a concave lens;Third lens 3, fifth lens 5, eighth lens 8 are convex lenses;Sixth lens 6, ninth lens 9 are concave-convex lenses;

[0040] The right end face of second lens 2 is a concave surface, and the left and right end faces of third lens 3 and fifth lens 5 are both convex surfaces, and the convex height of the left end face is less than that of the right end face;The left and right end faces of eighth lens 8 are symmetrically convex convex surfaces;The left end face of sixth lens 6 and ninth lens 9 is a concave surface, and the right end face is a convex surface.

[0041] The device is a zoom lens applied to an industrial endoscope, and the optical path diagram during specific work refers to Figure 6 , which can well expand the shooting range, improve the accuracy of the shooting image and facilitate subsequent operation.

[0042] The first lens 1 in the device mainly filters stray light or useless waveband light, provides more pure incident light for subsequent lens groups, protects the optical system and reduces the influence of strong light or harmful waveband light on the subsequent optical path.

[0043] Second lens 2 is a concave lens and is located at the front end of the optical path, and its main function is to preliminarily diverge the incident light so that the light enters the subsequent lens group at an appropriate angle. This function lays the foundation for the optical path design of the entire optical system and improves the optical performance of the subsequent lens.

[0044] The third lens 3 is a convex lens, which has the effect of preliminarily converging the light rays diverged by the second lens 2, providing a relatively uniform light field for the subsequent curvature adjusting lens, coordinating the light path distribution of the front and rear lenses to ensure the rationality of the light path and the imaging accuracy, and adjusting the angle and direction of the light path through a certain refraction effect, so that the light beam is more concentrated, and the incident light is optimized for the fourth lens 4 in the next stage.

[0045] The fourth lens 4 and the seventh lens 7 have the same effect, that is, the curvature will change after being energized, and the change of the curvature will affect the refraction ability of the lens to the light rays, so that the light rays are focused to different positions; the change of the curvature affects the focal length and the light refraction path, so as to dynamically adjust the focal point position or compensate for the aberration of the optical system, and improve the imaging flexibility and quality of the lens.

[0046] The fifth lens 5 is a convex lens, which has the effect of further converging the light rays adjusted by the fourth lens 4, reducing the divergence angle of the light rays, and enhancing the concentration of the light beam; the design of this lens not only improves the overall performance of the system, but also lays a foundation for the subsequent dynamic adjustment and imaging optimization.

[0047] The fifth lens 5 and the sixth lens 6 are provided with a diaphragm 13, and the first spacer ring 12 is arranged between the diaphragm 13 and the fifth lens 5.

[0048] The main function of the first spacer ring 12 in the device is to fix the fifth lens 5 and provide a reasonable gap between them to ensure the accuracy of the position of the lens and the light path; at the same time, the first spacer ring 12 can block the stray light between the lenses to some extent, avoiding its entry into the subsequent light path, thereby improving the signal-to-noise ratio of the optical system and the imaging quality.

[0049] The core function of the diaphragm 13 in the device is to limit the passing range of the light rays, allowing only the effective light beam in the central region to enter the next light path, and shielding the useless light beam or stray light at the edge to avoid adversely affecting the imaging quality; by limiting the size of the light beam, the diaphragm 13 can reduce the aberration (such as spherical aberration and coma) and light spot in the optical system, thereby improving the resolution and imaging clarity of the optical system; at the same time, the diaphragm 13 can effectively control the field of view of the system to meet the optical design requirements, avoiding the deviation of the light from the imaging range due to the too wide field of view.

[0050] The sixth lens 6 is a concave-convex lens, the concave surface has the effect of divergence, and the concave part of the sixth lens 6 has the effect of divergence on the incident light rays, making the distribution of the light rays more uniform, which helps to avoid the light rays being too concentrated near the optical axis.

[0051] The convex surface has the effect of convergence, which reduces the divergence angle of the light rays and provides relatively concentrated or directional light rays for the subsequent optical elements.

[0052] The eighth lens 8 is a double convex lens, both sides are symmetrical convex, has stronger convergence ability. In the system, the light beam is more concentrated to meet the needs of subsequent optical elements or imaging sensors.

[0053] The second spacer ring 14 has the same effect as the first spacer ring 12, both of which block stray light between lenses to avoid entering the subsequent light path, thereby improving the signal-to-noise ratio of the optical system and the imaging quality.

[0054] The ninth lens 9 is also a meniscus lens, but the concave and convex surfaces are arranged in the opposite direction of the sixth lens 6; the concave surface of the ninth lens 9 is mainly used for divergence, and the light after divergence enters the lens, and the contact with the convex surface will be converged again, which helps to avoid the light being too concentrated near the optical axis.

[0055] The tenth lens 10 and the first lens 1 have the same effect, both of which are filtering lenses, mainly for further selective filtering and optimization of light to ensure that the light entering the photosensitive chip 11 meets the requirements.

[0056] The photosensitive chip 11 in the device can convert light of different wavelengths (such as visible light, infrared light, or ultraviolet light) into current or voltage signals. This process is based on the photoelectric effect or other physical principles; it is an imaging sensor.

[0057] It also includes a housing assembly 15, which includes an inner housing 151 for mounting the fifth lens 5 and the sixth lens 6; a first outer housing 152 for mounting the first lens 1, the second lens 2, and the third lens 3; a second outer housing 153 for mounting the eighth lens 8, the ninth lens 9, and the tenth lens 10; a third outer housing 154 for mounting the photosensitive chip 11; the fourth lens 4 is installed between the first outer housing 152 and the inner housing 151, and the seventh lens 7 is installed between the second outer housing 153 and the inner housing 151.

[0058] The inner housing 151 in the device is mainly used for the installation of the fifth lens 5 and the sixth lens 6; and the first spacer ring 12 and the diaphragm 13 are installed in the inner housing 151; after the inner housing 151 is installed, the first outer housing 152 and the second outer housing 153 are installed outside the inner housing 151 through threaded connection; and the first lens 1, the second lens 2, and the third lens 3 are installed in the first outer housing 152, and the eighth lens 8, the ninth lens 9, and the tenth lens 10 are installed in the second outer housing 153; so that all the lenses form an optical axis.

[0059] The first outer housing 152 is provided with a first limiting ring 155, and the third lens 3 contacts the first limiting ring 155; the second outer housing 153 is provided with a second limiting ring 156, and the ninth lens 9 contacts the second limiting ring 156; and a mounting ring groove is provided in the second outer housing 153, and the tenth lens 10 is fixed in the mounting ring groove.

[0060] The first limiting ring 155 in the device limits the position of the third lens 3, and the second limiting ring 156 limits the positions of the eighth lens 8 and the ninth lens 9 in combination with the second spacer ring 14; and the second limiting ring 156 divides the second housing 153 into two mounting spaces, one of which forms a mounting ring groove for mounting the tenth lens 10.

[0061] The first housing 152 is provided with a first through slot 16, and the second housing 153 is provided with a second through slot 17; the first through slot 16 is provided with a first circuit board 18, one end of the first circuit board 18 is connected with a first conductive plate 20, and the first circuit board 18 is arranged between the fourth lens 4 and the inner housing 151; the second through slot 17 is provided with a second circuit board 19, one end of the second circuit board 19 is connected with a second conductive plate 21, and the second circuit board 19 is arranged between the inner housing 151 and the seventh lens 7.

[0062] The first through slot 16 in the device is mainly to provide a line connection structure for power supply of the fourth lens 4, and the second through slot 17 is to provide a line connection structure for power supply of the seventh lens 7; the middle parts of the first circuit board 18 and the second circuit board 19 are both provided with through holes, which can allow light to pass through smoothly, and the first conductive plate 20 connected with the first circuit board 18 can supply power to the fourth lens 4 after being electrified, and the second conductive plate 21 connected with the second circuit board 19 can supply power to the seventh lens 7 after being electrified.

[0063] The optical glass of the second lens has a brand of H-ZLaf4LA, a diameter of 2.9.00-0.01 / -0.025mm, a center thickness of 0.292+0.02mm, a radius of the left end circular arc surface of INFINITY +0.1mm, and a radius of the right end circular arc surface of 1.346±0.1mm.

[0064] The optical glass of the third lens has a brand of H-ZF52, a diameter of 2.9.00-0.01 / -0.025mm, a center thickness of 0.692+0.02mm, a radius of the left end circular arc surface of 12.17929 +0.1mm, and a radius of the right end circular arc surface of -2.73711±0.1mm.

[0065] The optical glass of the fifth lens has a brand of H-QK3L, a diameter of 1.800-0.01 / -0.025mm, a center thickness of 0.509+0.02mm, a radius of the left end circular arc surface of 10.17517 +0.1mm, and a radius of the right end circular arc surface of -1.43372±0.1mm.

[0066] The optical glass of the sixth lens is H-K9L, the diameter is 1.800-0.01 / -0.025mm, the center thickness is 0.148+0.02mm, the radius of the left end circular arc surface is -1.0061+0.1mm, and the radius of the right end circular arc surface is -1.16108+0.1mm.

[0067] The optical glass of the seventh lens is H-LaK52, the diameter is 2.700-0.01 / -0.025mm, the center thickness is 0.65+0.02mm, the radius of the left end circular arc surface is 3.709841+0.1mm, and the radius of the right end circular arc surface is -3.70984+0.1mm.

[0068] The optical glass of the eighth lens is H-LaK52, the diameter is 2.700-0.01 / -0.025mm, the center thickness is 0.22+0.02mm, the radius of the left end circular arc surface is -1.46254+0.1mm, and the radius of the right end circular arc surface is -4.478+0.1mm.

[0069] The first lens is sapphire, the tenth lens is an IR filter, and the fourth lens is a TLENS lens.

[0070] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments are not required to be enumerated, and the changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A zoom lens for an industrial endoscope, characterized in that: The system includes a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8), a ninth lens (9), a tenth lens (10), and a photosensitive chip (11), arranged from left to right. The first lens (1), the fourth lens (4), the seventh lens (7), and the tenth lens (10) are plane mirrors. The second lens (2) is a concave lens. The third lens (3), the fifth lens (5), and the eighth lens (8) are convex lenses. The sixth lens (6) and the ninth lens (9) are concave-convex lenses. The right end face of the second lens (2) is concave. The left and right end faces of the third lens (3) and the fifth lens (5) are convex, and the height of the convexity of the left end face is less than the height of the convexity of the right end face. The left and right sides of the eighth lens (8) are symmetrically convex. The left end face of the sixth lens (6) and the ninth lens (9) is concave, and the right end face is convex.

2. The industrial endoscope zoom lens according to claim 1, characterized in that: An aperture stop (13) is provided between the fifth lens (5) and the sixth lens (6), and a first spacer (12) is provided between the aperture stop (13) and the fifth lens (5).

3. The industrial endoscope zoom lens according to claim 2, characterized in that: A second spacer (14) is provided between the seventh lens (7) and the eighth lens (8).

4. The industrial endoscope zoom lens according to claim 3, characterized in that: It also includes a housing assembly (15), which includes an inner housing (151) for mounting the fifth lens (5) and the sixth lens (6); a first outer housing (152) for mounting the first lens (1), the second lens (2), and the third lens (3); a second outer housing (153) for mounting the eighth lens (8), the ninth lens (9), and the tenth lens (10); a third outer housing (154) for mounting the photosensitive chip (11); the fourth lens (4) is mounted between the first outer housing (152) and the inner housing (151), and the seventh lens (7) is mounted between the second outer housing (153) and the inner housing (151).

5. The industrial endoscope zoom lens according to claim 4, characterized in that: The first housing (152) is provided with a first limiting ring (155) inside, and the third lens (3) is in contact with the first limiting ring (155); the second housing (153) is provided with a second limiting ring (156) inside, and the ninth lens (9) is in contact with the second limiting ring (156). A mounting ring groove is provided inside the second housing (153), and the tenth lens (10) is fixed in the mounting ring groove.

6. The industrial endoscope zoom lens according to claim 5, characterized in that: The first outer shell (152) is provided with a first through groove (16), and the second outer shell (153) is provided with a second through groove (17); a first circuit board (18) is provided in the first through groove (16), one end of the first circuit board (18) is connected to a first conductive plate (20), and the first circuit board (18) is located between the fourth lens (4) and the inner shell (151); a second circuit board (19) is provided in the second through groove (17), one end of the second circuit board (19) is connected to a second conductive plate (21), and the second circuit board (19) is located between the inner shell (151) and the seventh lens (7).

Images