CN115236844A - High-telecentricity lens capable of keeping continuous zoom F number same - Google Patents
High-telecentricity lens capable of keeping continuous zoom F number same Download PDFInfo
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- CN115236844A CN115236844A CN202210817103.1A CN202210817103A CN115236844A CN 115236844 A CN115236844 A CN 115236844A CN 202210817103 A CN202210817103 A CN 202210817103A CN 115236844 A CN115236844 A CN 115236844A
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- 238000005452 bending Methods 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 7
- 238000012634 optical imaging Methods 0.000 abstract 2
- 238000003384 imaging method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
Abstract
The invention belongs to the technical field of optical imaging, and particularly relates to a high-telecentricity lens capable of keeping the same continuous variable power F number. The adjusting hand wheel rotates for a certain angle, the zooming lens group A and the zooming lens group B move along the optical axis to realize zooming, and the aperture of the adjustable aperture is also linked to be opened and closed to a certain size to ensure that the F number is the same as the F number before zooming; the optical zoom can be realized by only selecting the adjusting hand wheel A, and the opening and closing calibers of the linked adjustable light rings ensure the same F number. The invention has simple operability, eliminates the prior complex operations of adjusting the aperture and the camera exposure after each zooming in order to ensure the consistency of the optical imaging illumination and the imaging picture brightness, and can finish zooming and adjusting the aperture by only rotating the adjusting hand wheel A.
Description
Technical Field
The invention belongs to the technical field of high-telecentricity lenses, and particularly relates to a high-telecentricity lens capable of keeping the same continuous variable magnification F number.
Background
The high-telecentricity lens in the industrial detection field is widely used in high-precision fields such as high-precision part processing, semiconductor industry, electronic product field and the like; two-sided telecentric lens of high magnification of long working distance as patent application 201810022560.5 discloses, including diaphragm, preceding lens group that has positive focal power and the back lens group that has negative focal power, preceding lens group, diaphragm and back lens group set gradually along the light incidence direction, just the back focus of preceding lens group with the preceding focus coincidence of back lens group.
However, when the high-telecentricity lens is used, a backlight or coaxial light mode is used for intensifying light to the detected piece, and when the backlight and coaxial light brightness are not changed, the high-telecentricity lens changes the multiplying power, the brightness of an object shot by a camera changes, and the size of an aperture needs to be adjusted to enable the F number to be the same as the previous multiplying power; or changing the brightness of the backlight light source and the coaxial light source to make the image illumination identical to the image illumination of the previous multiplying power; the illuminance in the image analysis software is a very important parameter, and if the illuminance of the measured object cannot be kept consistent, the measurement precision is deviated, which may cause inaccurate measurement. In the existing zoom high-telecentricity lens, the diaphragms are independently adjusted, and in practice, complicated operation is needed to enable the illumination intensity under multiple magnifications to be the same, but the light source brightness and the diaphragm F number cannot be kept consistent in the continuous zoom use condition, which can cause detection deviation.
Disclosure of Invention
In order to solve the problems of deviation and inaccurate measurement of the measurement precision, the invention aims to provide the high-telecentricity lens for keeping the continuous variable magnification F number the same, wherein the high-telecentricity lens can ensure that the high-telecentricity lens is subjected to zooming under the condition that a light source does not change, the F number of the diaphragm is always kept the same, and the illumination of the picture is also kept the same; the complicated operation of the variable-magnification high-telecentricity lens can be effectively reduced, and the problem that the image illumination is different when the high-telecentricity lens is continuously subjected to zooming can be solved.
Another object of the present invention is to provide a high-telecentricity lens capable of continuously varying the magnification F number by rotating a cam barrel, and simultaneously, changing the aperture size by rotating a cam plate, so as to achieve the uniform F number at any magnification of the high-telecentricity lens.
In order to achieve the above object, the technical solution of the present invention is as follows.
A high-telecentricity lens keeping the same number of continuous variable-power F comprises a fixed lens group A, a fixed lens group B, an adjustable aperture, a variable-power lens group A, a variable-power lens group B, a fixed lens group C, an adjusting hand wheel A and a lens cone C which are sequentially arranged from left to right along the direction of an optical axis, wherein an object space is on the left side and an image space is on the right side; the fixed lens group A, the fixed lens group B and the adjustable aperture are fixed on the lens barrel A, wherein the fixed lens group A is arranged on the left side of the fixed lens group B, and the fixed lens group B is arranged on the left side of the adjustable aperture; the zoom lens group A is arranged on the right side of the adjustable aperture, and the zoom lens group B is arranged on the right side of the zoom lens group A; the fixed lens group C is arranged on the right side of the zoom lens group B and is fixed on the lens cone C; the adjusting handwheel A rotates the zoom lens group A with any angle and the zoom lens group B to move forwards or backwards along the optical axis to realize zooming, and simultaneously drives the adjustable aperture to change the size, wherein the aperture size is the aperture size of F number =20 under the current magnification, namely the F number =20 under the current magnification is ensured no matter the aperture is adjusted to be large or small; the relationship between the optical variable magnification and the aperture is that the aperture is larger when the magnification is larger, and the relationship is in a positive trend; the optical magnification variation is 1 to 15 times.
Further, the fixed lens group a is composed of three convex lenses and two concave lenses.
Further, the fixed lens group B is composed of two convex lenses and two concave lenses.
Further, the variable power lens group A is composed of a concave lens and a convex lens.
Further, the variable power lens group B consists of a concave lens and a convex lens.
Further, the fixed lens group C is composed of two concave lenses and four convex lenses.
Further, the zoom lens group A and the zoom lens group B move along the optical axis for zooming and are guided by two groups of linear grooves with different lengths and inconsistent circumferential angles of the lens barrel B, two groups of curve grooves with different lengths, different bending degrees, inconsistent end point angle positions and the same total angle of each curve end point of the cam barrel are driven, the cam barrel is driven to rotate by rotating the adjusting hand wheel, and the zoom lens group A and the zoom lens group B are driven to move in the optical axis direction in the lens barrel II by rotating the cam barrel; wherein each group is defined by 3 identical grooves distributed circumferentially.
Furthermore, the cam cylinder is composed of two curve grooves which are staggered with each other, do not intersect with each other and have different curvatures; the cam barrel is provided with positioning holes distributed circumferentially and has the function that the cam barrel and the adjusting hand wheel are connected with each other to form synchronous rotation.
Further, the adjustable diaphragm is composed of a diaphragm seat, blades, a cam plate and a clamping ring, wherein the maximum rotation angle of the diaphragm is the same as that of the cam barrel curved groove; the cam plate is provided with a plane convex deflector rod, wherein the deflector rod is connected with an adjusting hand wheel A, the adjusting hand wheel A rotates to drive the cam plate to rotate, and the cam plate drives the blades to swing, so that the aperture size of the aperture is changed.
Furthermore, the adjusting hand wheel A is attached with positioning holes distributed circumferentially and has the function that the adjusting hand wheel A and the cam barrel are connected with each other to form synchronous rotation; a limiting groove is attached to the inside of the adjusting hand wheel A and is used for being connected with the raised deflector rod of the adjustable aperture cam plate to adjust the aperture size of the aperture.
Further, the aperture size of the diaphragm must be maintained at the aperture size of the current magnification F number =20.
Further, the aperture size of the diaphragm must be kept at the aperture size of the current multiplying power F =20, and a plurality of important multiplying power adjusting angles between 1 time and 15 times are set to be reflected in the cam barrel curve groove; calculating the aperture sizes of a plurality of important multiplying powers F number =20 between 1 time and 15 times; setting the angle of the adjustable diaphragm to rotate by 1 to 15 times for a plurality of diaphragm aperture sizes with the important magnification F number =20 to be the same as the rotation angle of the current magnification of the cam barrel.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the rotating adjusting hand wheel A can drive the cam barrel to rotate and drive the aperture cam plate to rotate, the cam barrel can rotate to realize continuous zooming of the high-telecentricity lens, and the cam plate can rotate to realize the change of the aperture size of the aperture; the aperture size is always equal to the aperture size of F number =20 under the current high-telecentricity lens multiplying power; the F number of the high-telecentricity lens is always equal to 20 under any multiplying power, and the relative illumination is always consistent.
Drawings
Fig. 1 is a schematic structural diagram of a high-telecentricity lens implemented by the present invention.
FIG. 2 is a schematic view of a fixed lens group A according to the present invention.
FIG. 3 is a schematic structural diagram of a fixed lens group B according to the present invention.
Fig. 4 is a schematic structural diagram of the variable power lens group a of the present invention.
Fig. 5 is a schematic structural diagram of the variable power lens group B according to the present invention.
FIG. 6 is a schematic structural diagram of a fixed lens group C according to the present invention.
FIG. 7 is a schematic view of a linkage structure of an adjustable aperture and a zoom lens set according to the present invention.
FIG. 8 is a schematic diagram of a second linkage structure of an adjustable aperture and a zoom lens set according to the present invention.
Fig. 9 is a schematic view of a third linkage structure of an adjustable aperture and a zoom lens set according to the present invention.
Fig. 10 is a schematic diagram of a cam cylinder according to the present invention in which the start angles of the curved grooves a and B coincide with each other.
Fig. 11 is a schematic design diagram of the cam cylinder according to the present invention in which the start angles of the curved grooves a and B are staggered by a certain angle.
Fig. 12 is a schematic view showing the aperture size and the cam plate rotation angle of the adjustable aperture stop of the present invention in a state where the magnification is 1 and the F-number =20.
Fig. 13 is a schematic view showing the aperture size and the cam plate rotation angle of the adjustable aperture stop of the present invention in a state where the magnification is 2 and the F-number =20.
Fig. 14 is a schematic view showing the aperture size and the cam plate rotation angle of the adjustable diaphragm of the present invention in a state where the magnification is 3 and the F-number =20.
Fig. 15 is a schematic view showing the aperture size and the cam plate rotation angle of the adjustable aperture stop of the present invention in a state where the magnification is 4 and the F-number =20.
Fig. 16 is a schematic view showing the aperture size and the cam plate rotation angle of the adjustable diaphragm of the present invention in a state where the magnification is 5 and the F-number =20.
The labels in the figure are: 1-a fixed lens group a; 101-fixed lens group A, the 1 st convex lens; 102-fixed lens group a, 1 st concave lens; 103-fixed lens group A, no. 2 convex lens; 104-fixed lens group A, 2 nd concave lens; 103-fixed lens group A, no. 3 convex lens; 2-fixed lens group B; 201-fixed lens group B, the 1 st concave lens; 202-fixed lens group B, convex lens of No. 1; 203-fixed lens group B, the 2 nd concave lens; 204-fixed lens group B, convex lens of No. 2; 3-a zoom lens group A; 301-zoom lens group A convex lens; 302-variable magnification lens group B concave lens; 4-zoom lens group B; 401-variable magnification lens group B concave lens; 402-variable power lens group B convex lens; 5-fixed lens group C; 501-fixed lens group C, the 1 st convex lens; 502-fixed lens group C, convex lens 2; 503-fixed lens group C, the 1 st concave lens; 504-fixed lens group C, the 3 rd convex lens; 505-fixed lens group C, 2 nd concave lens; 506-fixed lens group C, convex lens No. 4; 6-adjustable aperture; 7, adjusting a hand wheel A; 8-connecting screw; 9-lens barrel a; 10-a set screw; 11-a cam barrel; 12-lens barrel B; 13-set screws; 14-lens barrel C; and 15, guiding the nail.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a specific implementation process, as shown in fig. 1, the zoom lens system is composed of a fixed lens group a (1), a fixed lens group B (2), an adjustable aperture (6), a zoom lens group a (3), a zoom lens group B (4), a fixed lens group C (5), an adjusting handwheel a (7) and a lens cone C (14), which are sequentially arranged from left to right in an optical axis direction, wherein an object space is measured on the left side and an image space is measured on the right side; the fixed lens group A (1), the fixed lens group B (2) and the adjustable aperture (6) are fixed on the lens cone A (9), wherein the fixed lens group A (1) is arranged on the left side of the fixed lens group B (2), and the fixed lens group B (2) is arranged on the left side of the adjustable aperture (6); the zooming lens group A (3) is arranged on the right side of the adjustable diaphragm (6), and the zooming lens group B (4) is arranged on the right side of the zooming lens group A (3); the fixed lens group C (5) is arranged on the right side of the zoom lens group B (4) and is fixed on the lens cone C (14); the adjusting handwheel A (7) rotates the variable-power lens group A (3) with any angle and the variable-power lens group B (4) to move forwards or backwards along the optical axis to realize variable power, and the adjusting handwheel A (7) also drives the adjustable aperture to change the aperture, wherein the aperture is the aperture of the F number =20 under the current magnification; the relationship between the optical variable magnification and the aperture is that the aperture is larger when the magnification is larger, and the relationship is in a positive trend relationship; the optical magnification variation is 1 to 15 times.
As shown in fig. 2, the fixed lens group a, the 1 st convex lens (101) is at the leftmost side of the fixed lens group a (1), the fixed lens group a, the 1 st concave lens (102) is at the right side of the fixed lens group a, the 2 nd convex lens (103) is at the right side of the fixed lens group a, the 1 st concave lens (102), the fixed lens group a, the 2 nd concave lens (104) is at the right side of the fixed lens group a, the 3 rd convex lens (105) and the 2 nd concave lens (104) constitute the fixed lens group a (1); wherein the lenses to be spaced apart are spaced apart in a circular manner.
As shown in fig. 3, the fixed lens group B, the 1 st concave lens (201) is at the leftmost side of the fixed lens group B (2), the fixed lens group B, the 1 st convex lens (202) is at the right side of the fixed lens group B, the 1 st concave lens (201), the fixed lens group B, the 2 nd concave lens (203) is at the right side of the 1 st convex lens (202), the fixed lens group B, the 2 nd convex lens (204) is at the right side of the 2 nd concave lens (203), and 2 convex lenses and 2 non-concave lenses constitute the fixed lens group B (2); wherein the lenses to be spaced apart are all spaced apart in a circular manner.
The fixed lens group a (1) and the fixed lens group B (2) are both installed in the inner wall of the lens barrel a (9) as shown in fig. 1, wherein the fixed lens group B (2) is installed at the right side of the fixed lens group a (1) and at a certain distance.
As shown in fig. 4, the 1 st convex lens (301) of the variable power lens group a is arranged at the leftmost side of the variable power lens group a (3), the 1 st concave lens (302) of the variable power lens group a is arranged at the right side of the 1 st convex lens (301) of the variable power lens group a, and 1 convex lens and 1 concave lens in total form the variable power lens group a (3).
As shown in FIG. 5, the 1 st concave lens (401) of the variable power lens group B is arranged at the leftmost side of the variable power lens group B (4), the 1 st convex lens (402) of the variable power lens group B is arranged at the right side of the 1 st concave lens (401) of the variable power lens group B, and 1 convex lens and 1 concave lens form the variable power lens group B (4).
As shown in FIG. 6, the fixed lens group C1 convex lens (501) is at the leftmost side of the fixed lens group C (5), the fixed lens group C2 convex lens (502) is at the right side of the fixed lens group C1 convex lens, the fixed lens group C1 concave lens (503) is at the right side of the fixed lens group C2 convex lens (502), the fixed lens group C3 convex lens (504) is at the right side of the fixed lens group C1 concave lens (503), the fixed lens group C2 concave lens (505) is at the right side of the fixed lens group C3 convex lens (504), the fixed lens group C4 convex lens (506) is at the right side of the fixed lens group C2 concave lens (505), and 4 convex lenses and 2 non-concave lenses constitute the fixed lens group C (5), wherein the lenses which are required to be separated are all separated in a circular ring manner.
The fixed lens group C (5) is fixed in the inner wall of the barrel C (14) as shown in fig. 1, and the fixed lens group C (5) is positioned at the rightmost side of the optical system and also at the right side of the variable power lens group B (4).
As shown in fig. 8 and 9, the cam cylinder (11) has two groups of curved grooves with different lengths, different bending degrees, inconsistent end point angle positions and the same total angle of each curved end point on the circumference, wherein 3 grooves defined as the same in each group are distributed on the circumference to form 1 group;
as shown in fig. 10, fig. 10 is an expanded view of the initial design of the curved groove of the cam cylinder (11), and it can be seen that the abscissa is the circumferential angle of the cam cylinder (11) and the ordinate is the axial distance of the cam cylinder (11); the curve A and the curve B are curve groove center curves, wherein the curve A is a curve for realizing zooming by moving the zooming lens group B (4) along the optical axis, and the curve B is a curve for realizing zooming by moving the zooming lens group A (3) along the optical axis; it can be seen that the starting point of curve B is identical to the starting point of curve a in circumferential position, and the starting point of the axis is at a certain distance to avoid the interference between the two curves.
5 multiplying powers are set for conveniently explaining the curve design principle, wherein the multiplying powers are multiplying power 1, multiplying power 2, multiplying power 3, multiplying power 4 and multiplying power 5 respectively, and the multiplying power relation is that the multiplying power is from 5 to 1 and is from large multiplying power to small multiplying power; it can be seen from fig. 10 that the axial movement amounts required for the magnification variation coincidence curve a and curve B are different; it can be seen from fig. 10 that the curves a and B are different in the amount of axial movement, but the angles of rotation are identical.
As shown in fig. 11, fig. 11 is a development view of the final design of the curved groove of the cam barrel (11), and it can be seen from fig. 11 that the circumferential starting point positions of the curve a and the curve B are staggered by an angle β °, the same multiplying power rotation angles are the same, the axial distances are the same, the interference between the curved groove a and the curved groove B is avoided, the structural stability is enhanced, and the processing rigidity is enhanced.
As shown in fig. 12, fig. 12 shows the size of the aperture of the adjustable diaphragm (6) at magnification 1, wherein it can be seen that the rotation angle of the diaphragm lever is equal to the angle θ 4 ° of the magnification 1 of the curved groove of the cam barrel (11), and the rotation angle of the diaphragm lever is equal to the rotation angle of the magnification 1 of the cam barrel (11), so that the aperture of the diaphragm is always kept at the size of F number =20 in the optical system.
As shown in fig. 13, fig. 13 shows the size of the aperture of the adjustable diaphragm (6) at magnification 2, wherein it can be seen that the rotation angle of the diaphragm lever is equal to the angle θ 3 of the magnification 2 of the curved slot of the cam barrel (11), and the rotation angle of the diaphragm lever is equal to the rotation angle of the magnification 2 of the cam barrel (11), so that the aperture of the diaphragm is always maintained at the size of F number =20 in the optical system.
As shown in fig. 14, fig. 14 shows the size of the aperture of the adjustable diaphragm (6) at magnification 3, wherein it can be seen that the rotation angle of the diaphragm lever is equal to the angle θ 2 ° of the magnification 3 of the curved groove of the cam barrel (11), and the rotation angle of the diaphragm lever is equal to the rotation angle of the magnification 3 of the cam barrel (11), so that the aperture of the diaphragm is always kept at the size of F number =20 in the optical system.
As shown in fig. 15, fig. 15 shows the size of the aperture of the adjustable diaphragm (6) at magnification 4, wherein it can be seen that the rotation angle of the diaphragm lever is equal to the angle θ 1 of the magnification 4 of the curved slot of the cam barrel (11), and the rotation angle of the diaphragm lever is equal to the rotation angle of the magnification 4 of the cam barrel (11), so that the aperture of the diaphragm is always kept at the size of F number =20 in the optical system.
As shown in fig. 14, fig. 14 shows the size of the aperture of the adjustable diaphragm (6) at magnification 5, wherein it can be seen that the rotation angle of the diaphragm lever is equal to the angle θ 0 ° of the magnification 5 of the curved slot of the cam barrel (11), and the rotation angle of the diaphragm lever is equal to the rotation angle of the magnification 5 of the cam barrel (11), so that the aperture of the diaphragm is always kept at the size of F number =20 in the optical system.
As shown in fig. 9, it can be seen that there are two groups of straight slots with different lengths and different circumferential angle positions on the circumference of the lens barrel B (12), wherein each group is defined as that the same slot is distributed on the circumference with 3 as 1 group, and the lens barrel B (12) has 1 positioning screw hole and 4 fastening screw holes distributed on the circumference on the left side; as shown in fig. 1, the positioning screw (10) is positioned with the lens barrel a (9) through the positioning screw hole of the lens barrel B (12), the mutual positions of the adjustable aperture and the lens barrel a (9) and the lens barrel B (10) are ensured, and then the lens barrel a (9) and the lens barrel B are fixed by using the set screw (13).
As shown in fig. 9, a square groove 1 is provided in the left side of the lens barrel B (10), and a long circumferential groove 1 is provided at the circumferential position, wherein the square groove is used for mounting the clearance adjustable iris (6), and the circumferential groove is used for facilitating the rotation of a shift lever of the adjustable iris (6).
As shown in fig. 8 and 9, the surface of the adjusting handwheel (7) is provided with friction patterns, so that the rotating friction force is increased to facilitate rotation.
As shown in fig. 8 and 9, a square groove is arranged inside the adjusting hand wheel (7) and is used for matching with a deflector rod of the adjustable aperture (6); the right side of the adjusting hand wheel (7) is provided with 3 connecting screw holes which are used for being connected with the cam barrel (11) through connecting screws (8); the rotation of the aperture-adjustable deflector rod and the rotation of the cam barrel (11) are controlled by the adjusting hand wheel (7), and the rotation angles are kept consistent.
As shown in fig. 7, fig. 8 and fig. 9, 3 guide pins (15) are installed on the circumferences of the zoom lens group a (3) and the zoom lens group B (4), and are used for ensuring that the zoom lens group a (3) and the zoom lens group B (4) can smoothly move along the optical axis in the lens barrel B (12).
As shown in fig. 7 and 8, 3 guide pins (15) are mounted on the circumferences of the zoom lens group a (3) and the zoom lens group B (4), and the guide pins (15) are mounted in the straight groove and the curved groove of the lens barrel B (12) and the cam barrel (11); 3 connecting screws (8) are used for fixing the adjusting hand wheel (7) and the cam cylinder; the adjustable aperture (6) is arranged at the position of a circumferential groove of the lens barrel B (12), and a square groove of the adjusting hand wheel (7) is matched with a deflector rod of the adjustable aperture (6); the magnification and the aperture change can be adjusted by rotating the adjustable hand wheel (7), wherein the aperture size is always kept at the optical magnification, and the F number =20.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-decentration lens which keeps the same continuous variable magnification F number. The high-telecentricity optical system is characterized by comprising a fixed lens group A, a fixed lens group B, an adjustable aperture, a zoom lens group A, a zoom lens group B, a fixed lens group C, an adjusting hand wheel A and a lens cone C which are sequentially arranged from left to right in the optical axis direction, wherein an object space is measured on the left side, and an image space is measured on the right side; the fixed lens group A, the fixed lens group B and the adjustable aperture are fixed on the lens barrel A, wherein the fixed lens group A is arranged on the left side of the fixed lens group B, and the fixed lens group B is arranged on the left side of the adjustable aperture; the zoom lens group A is arranged on the right side of the adjustable aperture, and the zoom lens group B is arranged on the right side of the zoom lens group A; the fixed lens group C is arranged on the right side of the zoom lens group B and is fixed on the lens cone C; the adjusting hand wheel A rotates the zoom lens group A with any angle, and the zoom lens group B moves forwards or backwards along the optical axis to realize zooming, wherein the aperture size adjustment of the aperture ensures that the F number under the current magnification is =20; the relationship between the optical variable magnification and the aperture is that the aperture is larger when the magnification is larger, and the relationship is in a positive trend; the optical magnification variation is 1 to 15 times.
2. The high-telecentricity lens assembly for keeping a continuously variable power F-number the same as claimed in claim 1, wherein said fixed lens group a is composed of three convex lenses and two concave lenses.
3. The high-telecentricity lens assembly for keeping a continuously variable power F-number the same as in claim 1, wherein said fixed lens group B is composed of two convex lenses, two concave lenses.
4. The high-telecentricity lens assembly for keeping the same F-number for continuous variable power as claimed in claim 1, wherein said variable power lens group a is composed of one piece of concave lens and one piece of convex lens.
5. The high-telephoto lens system having the same continuous variable-power F-number as that of claim 1, wherein the variable-power lens group B is composed of one concave lens and one convex lens.
6. The high-telephoto lens system having the same continuous variable power F-number as that of claim 1, wherein the fixed lens group C is composed of two concave lenses and four convex lenses.
7. The high-telecentricity lens for keeping the same continuous zooming F number as claimed in claim 1, wherein the zoom lens group A and the zoom lens group B move along the optical axis for zooming and are guided by two groups of linear grooves with different lengths and inconsistent circumferential angles of the lens barrel B, two groups of curve grooves with different lengths, different bending degrees, inconsistent end point angle positions and the same total angle of each curve end point of the cam barrel are driven, the cam barrel is driven to rotate by rotating the adjusting hand wheel, and the cam barrel drives the zoom lens group A and the zoom lens group B to move along the optical axis direction in the lens barrel B; wherein each group is defined by 3 identical grooves distributed circumferentially.
8. The high-telecentricity lens for keeping the continuous variable magnification F number the same as in claim 1, wherein the cam barrel is composed of two curved grooves which are mutually dislocated, mutually intersected and have different curvatures; the cam barrel is attached with positioning holes distributed on the circumference, and the cam barrel and the adjusting hand wheel are connected with each other to form synchronous rotation.
9. The high-telephoto lens system for keeping the same F-number for continuous magnification variation as set forth in claim 1, wherein the adjustable aperture is composed of an aperture base, blades, a cam plate, and a snap ring, and wherein the maximum rotation angle of the aperture is the same as the maximum rotation angle of the curved groove of the cam barrel; the cam plate is provided with a plane convex deflector rod, wherein the deflector rod is connected with an adjusting hand wheel A, the adjusting hand wheel A rotates to drive the cam plate to rotate, the cam plate drives the blades to swing, and therefore the aperture size of the aperture is changed, and the aperture size of the aperture must be kept at the aperture size of the current multiplying power F number =20.
10. The lens with high telecentricity for keeping the same continuous variable magnification F number as in claim 1, wherein the adjusting hand wheel A is attached with circumferentially distributed positioning holes for the purpose that the adjusting hand wheel A and the cam barrel are connected with each other to form synchronous rotation; and a limiting groove is attached inside the adjusting hand wheel A and is used for connecting with the convex shifting lever of the adjustable aperture cam plate to adjust the aperture size of the aperture, and the aperture size must be kept at the aperture size of the current multiplying power F number =20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817103.1A CN115236844A (en) | 2022-07-12 | 2022-07-12 | High-telecentricity lens capable of keeping continuous zoom F number same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817103.1A CN115236844A (en) | 2022-07-12 | 2022-07-12 | High-telecentricity lens capable of keeping continuous zoom F number same |
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| Publication Number | Publication Date |
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| CN115236844A true CN115236844A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210817103.1A Pending CN115236844A (en) | 2022-07-12 | 2022-07-12 | High-telecentricity lens capable of keeping continuous zoom F number same |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040169934A1 (en) * | 2003-02-28 | 2004-09-02 | Makoto Oomura | Large zoom ratio, four-group zoom lens |
| CN107589535A (en) * | 2017-09-29 | 2018-01-16 | 福建福光股份有限公司 | The low big multiplying power long-focus high definition zoom lens of distortion |
| CN207473258U (en) * | 2017-10-11 | 2018-06-08 | 广州长步道光电科技有限公司 | A kind of manual diaphragm structure of dual extension amount of movement |
| CN112368622A (en) * | 2018-06-28 | 2021-02-12 | 株式会社尼康 | Lens barrel |
-
2022
- 2022-07-12 CN CN202210817103.1A patent/CN115236844A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040169934A1 (en) * | 2003-02-28 | 2004-09-02 | Makoto Oomura | Large zoom ratio, four-group zoom lens |
| CN107589535A (en) * | 2017-09-29 | 2018-01-16 | 福建福光股份有限公司 | The low big multiplying power long-focus high definition zoom lens of distortion |
| CN207473258U (en) * | 2017-10-11 | 2018-06-08 | 广州长步道光电科技有限公司 | A kind of manual diaphragm structure of dual extension amount of movement |
| CN112368622A (en) * | 2018-06-28 | 2021-02-12 | 株式会社尼康 | Lens barrel |
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Application publication date: 20221025 |