CN220121075U - Wide-range spectrum confocal lens - Google Patents
Wide-range spectrum confocal lens Download PDFInfo
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- CN220121075U CN220121075U CN202321630816.3U CN202321630816U CN220121075U CN 220121075 U CN220121075 U CN 220121075U CN 202321630816 U CN202321630816 U CN 202321630816U CN 220121075 U CN220121075 U CN 220121075U
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- 238000001228 spectrum Methods 0.000 title abstract description 4
- 230000003595 spectral effect Effects 0.000 claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 238000004026 adhesive bonding Methods 0.000 claims 2
- 238000003384 imaging method Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000011521 glass Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model provides a wide-range spectral confocal lens, which is characterized by comprising the following components in sequence from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, wherein the fourth lens is a glued lens, and a diaphragm is positioned on one surface of the object side of the first lens. The lens is structurally optimized, has strong adaptability and large measurement range, can also show good imaging effect on thicker glass samples, can solve the problems of long and large lens and other complex structures of the existing spectrum confocal lens, and further reduces the size and processing cost of the whole lens.
Description
Technical Field
The utility model belongs to the field of optical detection, and particularly relates to a wide-range spectral confocal lens.
Background
The spectral confocal displacement sensor is a novel non-contact photoelectric displacement sensor with ultrahigh precision and ultrahigh stability, and compared with a laser triangulation method, the spectral confocal displacement sensor has higher resolution due to the adoption of a spectral confocal technology, is insensitive to factors such as surface texture of a measured object, inclination, stray light of surrounding environment and the like, and is widely applied. The existing spectral confocal lens is small in measurement thickness range and poor in applicability, and a thicker glass sample cannot be measured, and the problem of long lens exists, so that the use range and cost of the whole displacement measurement machine can be influenced.
Disclosure of Invention
In view of the above, the utility model provides a wide-range spectral confocal lens which is structurally optimized, has strong adaptability and large measurement range, can also show good imaging effect on a thicker glass sample, can solve the problems of long and large lens and complex structure of the existing spectral confocal lens, and further reduces the size and processing cost of the whole lens.
The specific technical scheme is as follows:
the utility model provides a wide-range spectral confocal camera lens which characterized in that includes along the optical axis from object side to image side in proper order: the lens comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, wherein the fourth lens is a glued lens, and a diaphragm is positioned on one surface of the object side of the first lens.
Further, the first lens has a spherical surface curved to the object side, and the first lens has a planar surface on the image side.
Further, the surfaces of the object side and the image side of the second lens are spherical surfaces bent to the object side.
Further, the surface of the third lens on the object side is a spherical surface bent toward the image side, and the surface of the third lens on the image side is a spherical surface bent toward the object side.
Further, the two lenses of the fourth lens are glued to form a lens, one surface of the object side of the fourth lens is a spherical surface bent to the image side, one surface of the image side is a plane, and the middle glued surface is a spherical surface bent to the object side.
Further, the surface of the fifth lens element on the object side is a spherical surface curved to the image side, and the surface of the fifth lens element on the image side is a spherical surface curved to the object side.
Further, the surfaces of the sixth lens object and the image side are bent to the spherical surface of the object side.
Further, the total length of the spectral confocal lens is not more than 85.5mm.
Further, the aperture of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is not more than 40mm.
Further, the working F# of the spectral confocal lens is 1.85-2.09, and the object side NA of the spectral confocal lens is 0.2.
The utility model has the beneficial effects that: the wide-range spectral confocal lens sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from an object side to an image side along an optical axis, wherein a diaphragm is positioned on one surface of the object side of the first lens, and light rays emitted by an object plane at the object side during imaging sequentially pass through the lenses, and finally the image plane at the image side is imaged.
Drawings
FIG. 1 is a schematic view of the optical path structure of the present utility model;
FIG. 2 is a chart of the wavelength point of 450nm in a white light operating environment according to the present utility model;
FIG. 3 is a bar graph of 575nm wavelength points in a white light operating environment according to the present utility model;
FIG. 4 is a chart of 700nm wavelength points in a white light operating environment according to the present utility model;
FIG. 5 is a graph of the MTF of the system of the present utility model at a wavelength of 450 nm;
FIG. 6 is a graph of the MTF of the system of the present utility model at a wavelength of 575 nm;
FIG. 7 is a graph of the MTF of the system of the present utility model at a wavelength of 700 nm;
FIG. 8 is a graph of the spherical aberration correction at a wavelength of 450nm according to the present utility model;
FIG. 9 is a graph of the spherical aberration correction at wavelength 575nm in accordance with the present utility model;
FIG. 10 is a graph of the spherical aberration correction at 700 nm;
the lens comprises a 1-object plane, a 2-first lens, a 3-second lens, a 4-third lens, a 5-fourth lens, a 6-fifth lens, a 7-sixth lens, a focusing image plane with the wavelength of 450nm, a focusing image plane with the wavelength of 9-575 nm, a focusing image plane with the wavelength of 10-700 nm and an 11-diaphragm.
Description of the embodiments
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model 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 utility model.
Referring to fig. 1, the wide-range spectral confocal lens of the present embodiment includes, in order from the object side to the image: the lens comprises a first lens 2 with negative focal power, a second lens 3 with positive focal power, a third lens 4 with positive focal power, a fourth lens 5 with positive focal power, a fifth lens 6 with positive focal power, a sixth lens 7 with negative focal power, wherein the fourth lens 5 is a cemented lens, and a diaphragm 11 is positioned on one surface of the object side of the first lens 2. In this embodiment, light propagates from left to right, and light rays emitted by the object plane 1 are imaged on an image plane finally after passing through the six lenses, wherein the object space NA of the spectral confocal lens is 0.2, the aperture of the light passing through the first lens 2 to the sixth lens 7 is not more than 40mm, the total length of the lens is not more than 85.5mm, the imaging quality is good, the installation and the use are convenient, and the whole size of the detection device is further reduced. Preferably, in the present embodiment, the first lens 2, the second lens 3, the third lens 4, the fourth lens 5, the fifth lens 6 and the sixth lens 7 are all made of glass materials.
Specifically, in the present embodiment, the surface of the first lens element 2 on the object side is a spherical surface curved to the object side, and the surface of the first lens element on the image side is a plane. The surfaces of the object side and the image side of the second lens 3 are spherical surfaces bent to the object side. The surface of the third lens 4 on the object side is a spherical surface bent toward the image side, and the surface on the image side is a spherical surface bent toward the object side. The two lenses of the fourth lens 5 are glued to form a lens, one surface of the object side of the fourth lens 5 is a spherical surface bent to the image side, one surface of the image side is a plane, and the middle glued surface is a spherical surface bent to the object side. The surface of the fifth lens element 6 on the object side is a spherical surface curved to the image side, and the surface on the image side is a spherical surface curved to the object side. The object and image side surfaces of the sixth lens element 7 are curved to the object side spherical surface. The parameters of each optical element of the wide-range spectral confocal lens in the embodiment meet the following table:
| surface of the body | Lens surface | R(mm) | T(mm) | Nd | Vd |
| Object plane | Plane surface | Infinity is provided | 49.23 | - | - |
| First surface (diaphragm) | Spherical surface | -26.2 | 4.3 | 1.733 | 51.7 |
| A second surface | Plane surface | Infinity is provided | 7 | ||
| Third surface | Spherical surface | -33.34 | 4.15 | 1.92 | 21.5 |
| Fourth surface | Spherical surface | -26.65 | 3.63 | ||
| Fifth surface | Spherical surface | -373.95 | 4.99 | 1.92 | 21.5 |
| Sixth surface | Spherical surface | -70.2 | 1.0 | ||
| Seventh surface | Spherical surface | 232.43 | 6 | 1.95 | 20.4 |
| Eighth face | Spherical surface | -76.96 | 4 | 1.79 | 47.5 |
| Ninth face | Plane surface | Infinity is provided | 34.7 | ||
| Tenth surface | Spherical surface | 183.34 | 5.5 | 1.92 | 21.5 |
| Eleventh surface | Spherical surface | -100.65 | 4.98 | ||
| Twelfth surface | Spherical surface | -37.62 | 4.98 | 1.91 | 32.4 |
| Thirteenth surface | Spherical surface | -40.1 | 74.083 | ||
| Image plane | Plane surface | Infinity is provided |
In the above-mentioned surface, the first surface corresponds to the surface on the object side of the first lens element 2, the second surface corresponds to the surface on the image side of the first lens element 2, the third surface corresponds to the surface on the object side of the second lens element 3, the fourth surface corresponds to the surface on the image side of the third lens element 4, the fifth surface corresponds to the surface on the object side of the third lens element 4, the seventh surface corresponds to the surface on the object side of the fourth lens element 5, the eighth surface corresponds to the intermediate bonding surface of the fourth lens element 5, the ninth surface corresponds to the surface on the image side of the fourth lens element 5, the tenth surface corresponds to the surface on the object side of the fifth lens element 6, the eleventh surface corresponds to the surface on the image side of the fifth lens element 6, the second surface corresponds to the surface on the object side of the sixth lens element 7, the thirteenth surface corresponds to the image side of the sixth lens element 7, R is the radius of curvature 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 d light, and Vd is the abbe number corresponding to the material of each optical element.
The lens is preferably suitable for a white light source, the working distance of an object space is 67.8mm, the working F# of the system is 1.85-2.09, the working wavelengths are preferably reference design wavelengths of 450nm, 575nm and 700nm, the corresponding F# under three wavelengths is 1.85, 2.035 and 2.09 respectively, the focal distances of the image surfaces under the designed three wavelengths are distributed in a straight shape along the optical axis direction, the image surfaces 8 with the wavelength of 450nm, the image surfaces 9 with the wavelength of 575nm and the image surfaces 10 with the wavelength of 700nm are sequentially arranged along the optical axis direction, and the maximum distance between the three focal points is the measuring range of the wide-range spectrum confocal lens, namely the measuring range can be 16mm.
Further verifying that the point list is to study the imaging quality of the system by focusing the light reaching the image plane, and combining with fig. 2, 3 and 4, the light reaching the image plane of the system is in the range of airy disk, and the maximum value of RMS RADIUS of the lens at the wavelengths of 450nm, 575nm and 700nm is 0.234 μm, which is less than the diffraction limit value of 1.02 μm. As shown in fig. 5, 6, and 7, the transfer function (MTF) of the optical system is such that the MTF value of the system approaches the diffraction limit. As shown in fig. 8, 9 and 10, the spherical aberration correction is shown to be less than 0.01mm at each wavelength. To sum up, the wide-range spectral confocal lens has the advantages of large measurement range, high lens resolution, good imaging effect, wide thickness range applicable to detection products and wide applicability.
It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.
Claims (10)
1. The utility model provides a wide-range spectral confocal camera lens which characterized in that includes along the optical axis from object side to image side in proper order:
the lens comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, wherein the fourth lens is a glued lens, and a diaphragm is positioned on one surface of the object side of the first lens.
2. The wide-range spectral confocal lens of claim 1 wherein the first lens has an object-side surface that is spherical and curved toward the object side and an image-side surface that is planar.
3. The wide-range spectral confocal lens of claim 1 wherein the surfaces of the second lens on the object side and the image side are spherical surfaces curved toward the object side.
4. The wide-range spectral confocal lens of claim 1 wherein the surface of the third lens on the object side is a sphere curved to the image side and the surface on the image side is a sphere curved to the object side.
5. The wide-range spectral confocal lens of claim 1 wherein the fourth lens is formed by gluing two lenses, wherein one surface of the fourth lens on the object side is a spherical surface bent toward the image side, the other surface of the fourth lens on the image side is a plane, and the intermediate gluing surface is a spherical surface bent toward the object side.
6. The wide-range spectral confocal lens of claim 1 wherein said fifth lens has an object-side surface that is spherical and curved toward the image side, and wherein said image-side surface is spherical and curved toward the object side.
7. The wide-range spectral confocal lens of claim 1 wherein the surfaces of the sixth lens element and the image side are both curved to the sphere of the object side.
8. The wide-range spectral confocal lens of claim 1, wherein the total length of the spectral confocal lens is no greater than 85.5mm.
9. The wide-range spectral confocal lens of claim 1 wherein the light apertures of the first, second, third, fourth, fifth and sixth lenses are no greater than 40mm.
10. The wide-range spectral confocal lens of claim 1 wherein the spectral confocal lens has an operating f# of 1.85-2.09 and an object NA of 0.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630816.3U CN220121075U (en) | 2023-06-26 | 2023-06-26 | Wide-range spectrum confocal lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630816.3U CN220121075U (en) | 2023-06-26 | 2023-06-26 | Wide-range spectrum confocal lens |
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| Publication Number | Publication Date |
|---|---|
| CN220121075U true CN220121075U (en) | 2023-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321630816.3U Active CN220121075U (en) | 2023-06-26 | 2023-06-26 | Wide-range spectrum confocal lens |
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| CN (1) | CN220121075U (en) |
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2023
- 2023-06-26 CN CN202321630816.3U patent/CN220121075U/en active Active
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