CN216977794U - Confocal measuring lens of wide-angle spectrum - Google Patents
Confocal measuring lens of wide-angle spectrum Download PDFInfo
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- CN216977794U CN216977794U CN202123450877.5U CN202123450877U CN216977794U CN 216977794 U CN216977794 U CN 216977794U CN 202123450877 U CN202123450877 U CN 202123450877U CN 216977794 U CN216977794 U CN 216977794U
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Abstract
The utility model belongs to the technical field of optical measurement, and particularly relates to a large-angle spectrum confocal measurement lens which comprises a first lens group, a diaphragm and a second lens group; the first lens group, the diaphragm and the second lens group are sequentially arranged from an image space to an object space; the focal length of the first lens group is positive, and the focal length of the second lens group is positive. The utility model has novel structure and ingenious design, the first lens group enlarges and collimates the aperture of the input light source light so as to facilitate the lens to obtain longer working distance and measuring angle; the second lens group separates and focuses light with different wavelengths to different positions of an optical axis, when the light hitting the object plane is reflected back to the lens, the light is finally coupled into the optical fiber and transmitted to the external processor, and the external processor judges data such as thickness and height difference of the surface of the object to be measured through the wavelength of the reflected light. The utility model has high measurement precision, large measurement angle and low cost.
Description
Technical Field
The utility model belongs to the technical field of optical measurement, and particularly relates to a large-angle spectrum confocal measurement lens.
Background
At present, the spectrum confocal measurement is more and more widely applied to the field of precision detection, and a plurality of lenses with different specifications are provided according to the difference of measurement precision, the size and the measuring range of a measuring light spot and the maximum measurement angle.
At present, curved surface screens are applied more and more widely, spectral confocal measurement lenses with the characteristics of high precision, large detection angle and the like are required to be applied to the detection of the curved surface profile of the curved surface glass, the lenses are rare and high in cost, and the research and development application is bottleneck.
SUMMERY OF THE UTILITY MODEL
The utility model provides a large-angle spectrum confocal measuring lens aiming at the problems in the prior art, and the large-angle spectrum confocal measuring lens is high in measuring precision, large in measuring angle and low in cost.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a large-angle spectrum confocal measuring lens comprises a first lens group, a diaphragm and a second lens group; the first lens group, the diaphragm and the second lens group are sequentially arranged from an image space to an object space;
the focal length of the first lens group is positive, and the focal length of the second lens group is positive.
Wherein the focal length of the first lens group is F1, and the focal length of the second lens group is F2, so that 2.55< F1/F2< 3.83.
The first lens group comprises a third lens group and a fourth lens group which are sequentially arranged from an image space to an object space;
the focal length of the third lens group is negative, and the focal length of the fourth lens group is positive.
Wherein the focal length of the first lens group is set to F1, and the focal length of the third lens group is set to F11, then-0.41 < F11/F1< -0.62.
Wherein, the focal length of the first lens group is F1, the focal length of the fourth lens group is F12, and 0.62< F12/F1< 0.94.
The third lens group comprises a first lens and a second lens which are sequentially arranged from an image space to an object space, the fourth lens group comprises a third lens and a fourth lens which are sequentially arranged from the image space to the object space, the focal length of the first lens is negative, and the focal length of the second lens, the focal length of the third lens and the focal length of the fourth lens are positive.
Wherein the focal length of the first lens ranges from-25.7 mm to-21 mm; the focal length range of the second lens is 39 mm-48 mm, the focal length range of the third lens is 310 mm-370 mm, and the focal length range of the fourth lens is 185.5 mm-228 mm.
The second lens group comprises a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an image space to an object space, and the focal length of the fifth lens, the focal length of the sixth lens and the focal length of the seventh lens are all positive.
Wherein a focal length of the fifth lens ranges from 194.2mm to 237.9 mm; the focal length range of the sixth lens is 117.1mm to 145.2mm, and the focal length range of the seventh lens is 133.4mm to 164 mm.
Wherein a refractive index of the seventh lens is greater than 1.9.
The utility model has the beneficial effects that: the utility model has novel structure and ingenious design, optical fibers for receiving and transmitting are arranged on one side of an image space, a light source is adopted to irradiate a measured object, the light source sequentially passes through the first lens group and the second lens group for dispersion treatment, and the first lens group enlarges and collimates the aperture of the input light source light so that the lens can obtain longer working distance and measuring angle; the second lens group separates and focuses light with different wavelengths to different positions of an optical axis, when the light hitting the object plane is reflected back to the lens, the light is finally coupled into the optical fiber and transmitted to the external processor, and the external processor judges data such as thickness and height difference of the surface of the object to be measured through the wavelength of the reflected light. The utility model has high measurement precision, large measurement angle and low cost.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a light path diagram of the present invention.
FIG. 3 is a schematic diagram of a second lens group according to the present invention.
The reference numerals are respectively: 1. a first lens group, 2, a diaphragm, 3, a second lens group;
11. a third lens group, 12, a fourth lens group;
111. a first lens 112, a second lens 121, a third lens 122, and a fourth lens;
301. fifth lens element 302, sixth lens element 303, and seventh lens element
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
A confocal measuring lens of a large-angle spectrum is shown in figures 1-3 and comprises a first lens group 1, a diaphragm 2 and a second lens group 3; the first lens group 1, the diaphragm 2 and the second lens group 3 are arranged in sequence from an image space to an object space;
the focal length of the first lens group 1 is positive, and the focal length of the second lens group 3 is positive.
Specifically, an optical fiber for transmitting and receiving is arranged on one side of an image side, a light source is adopted to irradiate a measured object, the light source sequentially passes through the first lens group 1 and the second lens group 3 to carry out dispersion processing, after light striking the object surface is reflected back to the lens, the light is finally coupled into the optical fiber and transmitted to an external processor, and the external processor judges data such as thickness, height difference and the like of the surface of the measured object through the wavelength of reflected light. The middle first lens group 1 enlarges the aperture of the input light source and collimates the input light source so that the lens can obtain longer working distance and measuring angle; the second lens group 3 separately focuses light of different wavelengths to different positions on the optical axis.
In the confocal measurement lens with a large angle spectrum according to the present embodiment, the first lens group 1 includes a third lens group 11 and a fourth lens group 12 arranged in sequence from an image side to an object side;
the focal length of the third lens group 11 is negative, and the focal length of the fourth lens group 12 is positive.
The confocal measurement lens of wide-angle spectrum described in this example, the third lens group 11 includes first lens 111 and second lens 112 arranged in order from the image space to the object space, the fourth lens group 12 includes third lens 121 and fourth lens 122 arranged in order from the image space to the object space, the focal length of first lens 111 is negative, the focal length of second lens 112, the focal length of third lens 121 and the focal length of fourth lens 122 are positive.
Specifically, the focal length of the first lens 111 is negative, and light rays can be diverged, so that the overall structure of the first lens 111/the third lens 121 is compact, and then the light rays are collimated by the second lens 112, the third lens 121, and the fourth lens 122 in sequence; the third lens group 11 adopts a reverse telephoto type structure, and the lens length can be shortened.
In the confocal measurement lens with a large angle spectrum according to this embodiment, the second lens group 3 includes a fifth lens 301, a sixth lens 302 and a seventh lens 303 that are sequentially arranged from an image space to an object space, and a focal length of the fifth lens 301, a focal length of the sixth lens 302 and a focal length of the seventh lens 303 are all positive. Specifically, the second lens group 3 adopts a aplanatic lens structure, so that spherical aberration, coma aberration and astigmatism can be eliminated, the numerical aperture of an object space is increased, and the measurement angle of a lens is increased.
In the confocal measurement lens with a large angle spectrum, the focal length of the first lens group 1 is F1, and the focal length of the second lens group 3 is F2, so that 2.55< F1/F2< 3.83.
Specifically, the measurement accuracy of the arrangement is high, the inclination angle of the measured surface can be up to 44.8 degrees, the maximum working measurement distance can be up to 20.4mm, and the spectrum focusing range is not 1.8 mm.
In the confocal measurement lens with a large angle spectrum, the focal length of the first lens group 1 is F1, and the focal length of the third lens group 11 is F11, so that-0.41 < F11/F1< -0.62.
In the confocal measuring lens with a large angle spectrum, the focal length of the first lens group 1 is F1, the focal length of the fourth lens group 12 is F12, and 0.62< F12/F1< 0.94.
Specifically, the arrangement makes the first lens group 1 compact in structure, and the light is collimated after being dispersed.
In the confocal measuring lens with a large-angle spectrum described in the embodiment, the focal length of the first lens 111 ranges from-25.7 mm to-21 mm; the focal length of the second lens 112 ranges from 39mm to 48mm, the focal length of the third lens 121 ranges from 310mm to 370mm, and the focal length of the fourth lens 122 ranges from 185.5mm to 228 mm.
In the confocal measurement lens with a large angle spectrum described in this example, the focal length of the fifth lens 301 ranges from 194.2mm to 237.9 mm; the focal length of the sixth lens 302 ranges from 117.1mm to 145.2mm, and the focal length of the seventh lens 303 ranges from 133.4mm to 164 mm.
In the confocal measurement lens with a large angle spectrum described in this example, the refractive index of the second lens 112 and the refractive index of the seventh lens 303 are greater than 1.9.
Specifically, the larger the refractive index of the lens is, the more beneficial the correction of the spherical aberration of the system is, so that the focused light spot of the light on the object plane is smaller, and the measurement result is more accurate.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A confocal measuring lens of wide-angle spectrum which characterized in that: comprises a first lens group, a diaphragm and a second lens group; the first lens group, the diaphragm and the second lens group are sequentially arranged from an image space to an object space;
the focal length of the first lens group is positive, and the focal length of the second lens group is positive.
2. The confocal measurement lens of claim 1, wherein: the focal length of the first lens group is F1, and the focal length of the second lens group is F2, so that 2.55< F1/F2< 3.83.
3. The high-angle spectral confocal measurement lens of claim 1, wherein: the first lens group comprises a third lens group and a fourth lens group which are sequentially arranged from an image space to an object space;
the focal length of the third lens group is negative, and the focal length of the fourth lens group is positive.
4. The high-angle spectral confocal measurement lens of claim 3, wherein: the focal length of the first lens group is set to F1, and the focal length of the third lens group is set to F11, so that-0.41 < F11/F1< -0.62.
5. The high-angle spectral confocal measurement lens of claim 3, wherein: the focal length of the first lens group is F1, and the focal length of the fourth lens group is F12, so that 0.62< F12/F1< 0.94.
6. A high-angle-spectrum confocal measurement lens according to claim 3, wherein: the third lens group comprises a first lens and a second lens which are sequentially arranged from an image space to an object space, the fourth lens group comprises a third lens and a fourth lens which are sequentially arranged from the image space to the object space, the focal length of the first lens is negative, and the focal length of the second lens, the focal length of the third lens and the focal length of the fourth lens are positive.
7. The high-angle spectral confocal measurement lens of claim 6, wherein: the focal length range of the first lens is-25.7 mm to-21 mm; the focal length range of the second lens is 39mm to 48mm, the focal length range of the third lens is 310mm to 370mm, and the focal length range of the fourth lens is 185.5mm to 228 mm.
8. The high-angle spectral confocal measurement lens of claim 1, wherein: the second lens group comprises a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an image space to an object space, and the focal length of the fifth lens, the focal length of the sixth lens and the focal length of the seventh lens are positive.
9. The high-angle spectral confocal measurement lens of claim 8, wherein: the focal length range of the fifth lens is 194.2mm to 237.9 mm; the focal length range of the sixth lens is 117.1mm to 145.2mm, and the focal length range of the seventh lens is 133.4mm to 164 mm.
10. The confocal measurement lens of claim 8, wherein: the refractive index of the seventh lens is greater than 1.9.
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| CN202123450877.5U CN216977794U (en) | 2021-12-31 | 2021-12-31 | Confocal measuring lens of wide-angle spectrum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136215A (en) * | 2021-12-31 | 2022-03-04 | 东莞市普密斯精密仪器有限公司 | A large-angle spectral confocal measurement lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136215A (en) * | 2021-12-31 | 2022-03-04 | 东莞市普密斯精密仪器有限公司 | A large-angle spectral confocal measurement lens |
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