CN212623315U - High-power telecentric lens - Google Patents
High-power telecentric lens Download PDFInfo
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- CN212623315U CN212623315U CN202021226593.0U CN202021226593U CN212623315U CN 212623315 U CN212623315 U CN 212623315U CN 202021226593 U CN202021226593 U CN 202021226593U CN 212623315 U CN212623315 U CN 212623315U
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Abstract
The invention belongs to the field of optical detection elements, and particularly relates to a high-power telecentric lens, which sequentially comprises the following steps of: the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power. The diaphragm is positioned between the third lens and the fourth lens, and the second lens and the third lens, and the fourth lens and the fifth lens are cemented lenses. The optical path of the invention is transmitted from left to right, and the light emitted from the object plane is finally imaged on the image plane after passing through the lenses, wherein the calibers of the first lens to the sixth lens are all less than 20mm, the total length of the lens is not more than 120mm, the imaging quality is good, the installation and the use are convenient, the processing cost of the lenses is reduced, the whole size of the detection equipment is further reduced, and the invention has wide application prospect.
Description
Technical Field
The invention belongs to the field of optical detection elements, and particularly relates to a high-power telecentric lens.
Background
When optical measurement is adopted, when one or more parameters to be measured of a measured object are detected with high precision, the imaging lens is a vital optical element, and the traditional lens has larger measurement deviation due to different object distances and different magnifications, so that the measurement precision is seriously influenced. The telecentric lens can reduce or even eliminate the interference of parallax on the measurement precision, and can keep the magnification constant within a certain object distance range. Because cell-phone cover plate glass's two-dimensional code size is less, usually about 0.2 x 0.2mm, the telecentric lens of low magnification is because magnification is not enough, can't satisfy high accuracy and detect, this telecentric lens that just needs the check out test set to use has higher optical magnification, however, current telecentric lens can't satisfy above-mentioned demand, current telecentric lens has still that the camera lens is longer, the big scheduling problem of camera lens in addition mostly, lead to the structure complicated, the operation is used inconveniently.
Disclosure of Invention
In view of the above, the high-power telecentric lens has the advantages of reasonable structural design, convenience in operation and use, low manufacturing cost, good imaging quality and high measurement precision, the vertical magnification can reach 8X, the high-power telecentric lens can greatly meet the precision requirement when being applied to the quick size detection and two-dimensional code recognition of cover plate glass, the problems of long and large lens and other complex structures existing in the conventional telecentric lens can be solved, and the size and the processing cost of the whole telecentric lens are further reduced.
The specific technical scheme is as follows:
a high-power telecentric lens includes, in order from an object side to an image side along an optical axis:
the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power;
the surface of the first lens at the object side is a spherical surface bending to the image side, and the surface of the first lens at the image side is a spherical surface bending to the object side;
the surface of the second lens at the object side is a spherical surface bent to the image side, and the surface of the second lens at the image side is a spherical surface bent to the object side;
the surface of the third lens at the object side is a spherical surface bent to the object side, and the surface of the third lens at the image side is a spherical surface bent to the image side;
the surfaces of the object side and the image side of the fourth lens are spherical surfaces bent to the object side;
the surface of the fifth lens at the object side is a spherical surface bent to the object side, and the surface of the fifth lens at the image side is a spherical surface bent to the image side;
the surfaces of the sixth lens at the object side and the image side are spherical surfaces bending to the object side.
Further, the magnification of the high-power telecentric lens is 8 times.
Further, the second lens and the third lens of the high-power telecentric lens are cemented lenses, and the fourth lens and the fifth lens are cemented lenses.
Further, the total length of the high-power telecentric lens is less than 140 mm.
Further, the clear aperture of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is less than 20 mm.
Further, the diaphragm size is 1.66 mm.
Further, the object space working distance of the high-power telecentric lens is 110 mm.
Further, the depth of field of the high-power telecentric lens is 0.07 mm.
Further, the working F # of the high-power telecentric lens is 52.
Further, the object space view field range of the high-power telecentric lens is phi 1 mm.
The high-power telecentric lens has the beneficial effects that the high-power telecentric lens sequentially comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power from an object side to an image side along an optical axis, light rays emitted by the object side at the object side during imaging sequentially pass through the lenses, and finally an image plane at the image side is imaged, so that the structure design is reasonable, the total length of the lens is short, the overall size of the detection equipment is favorably reduced, the installation and debugging are convenient, the magnification is 8 times, the depth of field is 0.07mm, the imaging quality of the lens is good, and the measurement precision is high.
Drawings
FIG. 1 is a schematic diagram of an optical path structure of a high-power telecentric lens according to the present invention;
FIG. 2 is a system diagram of a high-power telecentric lens according to the present invention in a white light working environment;
FIG. 3 is a system MTF diagram of the high-power telecentric lens of the present invention in a white light working environment;
FIG. 4 is a diagram of distortion and curvature of field of the high-power telecentric lens of the present invention in a white light working environment;
FIG. 5 is a graph showing the relative illumination of the high-power telecentric lens according to the present invention;
FIG. 6 is a system point chart of the high-power telecentric lens of the invention under the condition of monochromatic wavelength of 587.6 nm;
FIG. 7 is a distortion and curvature of field diagram of the high-power telecentric lens of the invention under the condition of monochromatic wavelength of 587.6 nm;
FIG. 8 is a system MTF diagram of the high-power telecentric lens of the invention under the condition of monochromatic wavelength of 587.6 nm;
wherein, 1 is an object plane, 2 is a first lens, 3 is a second lens, 4 is a third lens, 5 is a diaphragm, 6 is a fourth lens, 7 is a fifth lens, 8 is a sixth lens, and 9 is an image plane.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
Referring to fig. 1, a schematic diagram of an optical path structure of the high-power telecentric lens according to the embodiment of the present invention includes, in order from an object side to an image side: the lens comprises a first lens 2 with positive focal power, a second lens 3 with positive focal power, a third lens 4 with negative focal power, a diaphragm 5, a fourth lens 6 with positive focal power, a fifth lens 7 with negative focal power and a sixth lens 8 with positive focal power. The second lens 3 and the third lens 4, and the fourth lens 6 and the fifth lens 7 are lenses glued together, and the diaphragm 5 is located between the third lens 4 and the fourth lens 6. The optical path of the invention is transmitted from left to right, and the light emitted by the object plane 1 finally forms an image on the image plane 9 after passing through the lenses, wherein the apertures of the first lens 2 to the sixth lens 8 are all smaller than 20mm, the total length of the lens is not larger than 120mm, the imaging quality is good, the installation and the use are convenient, and the size of the whole detection equipment is further reduced. Preferably, in this embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all made of glass materials.
More specific implementation modes of the invention are specifically developed as follows:
the surface of the first lens 2 at the object side is a spherical surface bending to the image side, and the surface at the image side is a spherical surface bending to the object side; the surface of the second lens 3 at the object side is a spherical surface bending to the image side, and the surface at the image side is a spherical surface bending to the object side; the surface of the third lens 4 on the object side is a spherical surface bent to the object side, and the surface on the image side is a spherical surface bent to the image side; the surfaces of the fourth lens 6 at the object side and the image side are spherical surfaces bent to the object side; the surface of the fifth lens 7 on the object side is a spherical surface curved toward the object side, and the surface of the image side is a spherical surface curved toward the image side; the surfaces of the sixth lens element 8 on the object side and the image side are spherical surfaces curved toward the object side. The parameters of each optical element of the high-power telecentric lens meet the following table.
It should be noted that, in the above table, the first surface corresponds to the surface of the first lens 2 on the object side, the second surface corresponds to the surface of the first lens 2 on the image side, the third surface corresponds to the surface of the second lens 3 on the object side, the fourth surface corresponds to the bonding surface of the second lens 3 and the third lens 4, the fifth surface corresponds to the surface of the third lens 4 on the image side, the seventh surface corresponds to the surface of the fourth lens 6 on the object side, the eighth surface corresponds to the bonding surface of the fourth lens 6 and the fifth lens 7, the ninth surface corresponds to the surface of the fifth lens 7 on the image side, the tenth surface corresponds to the surface of the sixth lens 8 on the object side, the eleventh surface corresponds to the surface of the sixth lens 8 on the image side, R is the curvature radius corresponding to the surface of each optical element, T is the air space corresponding to each optical element, Nd is the refractive index corresponding to each optical element for d light, and Vd is the abbe number corresponding to each optical element material.
In table 1, the object space working distance of the high-power telecentric lens is 110mm, the object space field range is phi 1mm, the working F # of the system is 52, the magnification of the telecentric lens is 8 times, and the working wavelengths are reference design wavelengths of 486.13270nm, 587.56180nm and 656.27250 nm. The aperture of the telecentric lens is smaller than 20mm, the size of the diaphragm 5 is 4.276mm, the influence of stray light can be effectively avoided by the arrangement of the diaphragm 5, and the imaging quality is improved. The telecentric lens of the embodiment is designed to have the telecentricity smaller than 0.1 degree, in telecentric optical imaging, the depth of field is an important parameter, the size of the depth of field determines the clear range of an image, and the depth of field of the telecentric lens of the embodiment is 0.07 mm.
The point chart is used for researching the imaging quality of the system through the concentration ratio of the light rays reaching the image surface, as can be seen from the graph in FIG. 2, the light rays reaching the image surface of the system are all in the range of Airy spots, and the maximum value of RMS RADIUS of the telecentric lens is 22.3 μm and is smaller than the diffraction limit value of 41.49 μm under the fields of 0 view, 0.3 view, 0.5 view, 0.707 view and 1.0 view. The transfer function (MTF) of the optical system is shown in fig. 3, and it can be seen that the MTF value of the system is relatively close to the diffraction limit. As shown in fig. 4, although the distortion and the field curvature do not affect the imaging quality, the size of the distortion affects the imaging accuracy during the size detection, and the distortions at the three wavelengths of the system are all below 0.03% by correction. The energy concentration of the optical system is shown in fig. 5.
The high-power telecentric lens of the embodiment is suitable for a white light source and a monochromatic light source, when the wavelength of the monochromatic light source is selected to be 587.6nm, the imaging quality is as shown in fig. 6, 7 and 8, and it can be seen that the imaging quality of the optical system under the condition of the monochromatic wavelength of 587.6nm has little change compared with the imaging quality under the condition of visible light, wherein the spot is further improved compared with the white light.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. A high-power telecentric lens includes, in order from an object side to an image side along an optical axis:
the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power;
the surface of the first lens at the object side is a spherical surface bending to the image side, and the surface of the first lens at the image side is a spherical surface bending to the object side;
the surface of the second lens at the object side is a spherical surface bent to the image side, and the surface of the second lens at the image side is a spherical surface bent to the object side;
the surface of the third lens at the object side is a spherical surface bent to the object side, and the surface of the third lens at the image side is a spherical surface bent to the image side;
the surfaces of the object side and the image side of the fourth lens are spherical surfaces bent to the object side;
the surface of the fifth lens at the object side is a spherical surface bent to the object side, and the surface of the fifth lens at the image side is a spherical surface bent to the image side;
the surfaces of the sixth lens at the object side and the image side are spherical surfaces bending to the object side.
2. A high-power telecentric lens according to claim 1 wherein the high-power telecentric lens has a magnification of 8.
3. The telecentric lens of claim 1, wherein the second and third lenses of the telecentric lens are cemented lenses and the fourth and fifth lenses are cemented lenses.
4. A telecentric lens according to claim 1 wherein the total length of the telecentric lens is less than 140 mm.
5. The high-power telecentric lens according to claim 1 or 2, wherein the clear aperture of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is less than 20 mm.
6. High-power telecentric lens according to claim 1 or 2, characterized in that the aperture size is 1.66 mm.
7. A telecentric lens according to claim 1 or 2, wherein the object working distance of the telecentric lens is 110 mm.
8. The high-power telecentric lens of claim 1 or 2, wherein the high-power telecentric lens has a depth of field size of 0.07 mm.
9. A telecentric lens according to claim 1 or 2, wherein the high-power telecentric lens has a working F # of 52.
10. A telecentric lens according to claim 1 or 2, wherein the object field range of the telecentric lens is Φ 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226593.0U CN212623315U (en) | 2020-06-29 | 2020-06-29 | High-power telecentric lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021226593.0U CN212623315U (en) | 2020-06-29 | 2020-06-29 | High-power telecentric lens |
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| CN212623315U true CN212623315U (en) | 2021-02-26 |
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| CN202021226593.0U Active CN212623315U (en) | 2020-06-29 | 2020-06-29 | High-power telecentric lens |
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