CN215116951U - Infrared temperature measurement lens - Google Patents
Infrared temperature measurement lens Download PDFInfo
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- CN215116951U CN215116951U CN202121651914.6U CN202121651914U CN215116951U CN 215116951 U CN215116951 U CN 215116951U CN 202121651914 U CN202121651914 U CN 202121651914U CN 215116951 U CN215116951 U CN 215116951U
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- object side
- image side
- infrared temperature
- temperature measurement
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Abstract
The utility model discloses an infrared temperature measuring lens, which comprises a first lens, a diaphragm and a second lens from an object side to an image side along an optical axis, wherein the first lens and the second lens respectively comprise an object side surface facing to the object side and enabling imaging light to pass and an image side surface facing to the image side and enabling the imaging light to pass; the first lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the first lens satisfies: nd1 is more than or equal to 1.8, wherein Nd1 is the refractive index of the first lens, and the second lens satisfies the following conditions: 4< | f2 | <7, where f2 is the focal length of the second lens. The utility model discloses infrared temperature measurement camera lens is only two lenses, and simple structure is compact, and the total length is short with lower costs, and it has the temperature drift compensation function, and resolution ratio is high, and the imaging quality is high.
Description
Technical Field
The utility model relates to the technical field of optics, particularly, relate to an infrared temperature measurement camera lens.
Background
The infrared temperature measuring lens can utilize self thermal radiation imaging of a measured object, so that the infrared temperature measuring lens can be used in all-weather environments. The existing infrared temperature measuring lens mainly has the following defects: the resolving power is low; the number of lenses is large, the total length is long, the structure is complex and the cost is high; poor temperature drift, high and low temperature, volatile coke.
In view of the above, the inventor of the present application invented an infrared temperature measurement lens.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an infrared temperature measurement camera lens of total length and temperature drift compensation function has.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an infrared temperature measurement lens sequentially comprises a first lens, a diaphragm and a second lens from an object side to an image side along an optical axis, wherein the first lens and the second lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the first lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the first lens satisfies: nd1 is more than or equal to 1.8, wherein Nd1 is the refractive index of the first lens, and the second lens satisfies the following conditions: 4< | f2 | <7, where f2 is the focal length of the second lens.
Further, the object-side surface and the image-side surface of the first lens are both aspheric surfaces.
Further, the object-side surface and the image-side surface of the second lens are both aspheric surfaces.
Furthermore, the materials of the first lens and the second lens are both chalcogenide glass.
After the technical scheme is adopted, the utility model has the advantages of as follows:
the utility model discloses infrared temperature measurement camera lens is only two lenses, and simple structure is compact, and the total length is short with lower costs, and it has the temperature drift compensation function, and resolution ratio is high, and the imaging quality is high.
Drawings
Fig. 1 is a light path diagram of a lens barrel according to embodiment 1 of the present invention;
fig. 2 is a MTF graph of the lens of embodiment 1 of the present invention under 8um-14um light;
fig. 3 is a light path diagram of a lens barrel according to embodiment 2 of the present invention;
fig. 4 is a MTF graph of the lens of embodiment 2 of the present invention under 8um-14um light;
fig. 5 is a light path diagram of a lens barrel according to embodiment 3 of the present invention;
fig. 6 is the utility model discloses the MTF curve graph of 3 camera lenses under 8um-14um light.
Description of reference numerals:
1-first lens, 2-diaphragm, 3-second lens, 4-protective sheet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in 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 the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, and are only for convenience of description and simplification of the present invention, but do not indicate or imply that the device or element of the present invention must have a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 6, the present invention discloses an infrared thermometric lens, which sequentially includes a first lens 1, a diaphragm 2 and a second lens 3 along an optical axis from an object side to an image side, wherein the first lens 1 and the second lens 3 respectively include an object side facing the object side and allowing imaging light to pass therethrough and an image side facing the image side and allowing imaging light to pass therethrough;
the first lens 1 has positive diopter, the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;
the second lens element 3 has a positive refractive power, and the first lens element 1 has a convex object-side surface and a concave image-side surface.
The object-side surface and the image-side surface of the first lens element 1 are aspheric surfaces, and the object-side surface and the image-side surface of the second lens element 3 are aspheric surfaces. Therefore, the resolution of the lens can be improved, and the total length of the lens can be shortened, so that the lens is compact and miniaturized.
In some embodiments, the first lens 1 satisfies: nd1 is more than or equal to 1.8, wherein Nd1 is the refractive index of the first lens 1. The first lens 1 is made of a high-refractive-index material, so that the outer diameter of the lens of the first lens 1 can be effectively reduced, and the miniaturization of the lens is further realized.
In some embodiments, the second lens 3 satisfies: 4< | f2 | <7, where f2 is the focal length of the second lens 3. The design of the second lens 3 is beneficial to the athermalization design of the lens, so that the lens can keep the focal length, the image surface or the image quality unchanged or slightly changed even if thrown away in a larger temperature range, and the temperature drift compensation function is realized, thereby ensuring the imaging quality.
In some embodiments, the materials of the first lens 1 and the second lens 3 are both chalcogenide glasses. By adopting chalcogenide glass, the cost can be effectively reduced while the use requirement of the lens is met.
The mini infrared imaging lens of the present invention will be described in detail with reference to the following embodiments.
Example 1
As shown in fig. 1, an infrared thermometric lens includes, in order from an object side to an image side along an optical axis, a first lens 1, a diaphragm 2 and a second lens 3, where the first lens 1 and the second lens 3 each include an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough;
the first lens 1 has positive diopter, the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;
the second lens 3 has positive diopter, the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;
the object-side surface and the image-side surface of the first lens element 1 are aspheric surfaces, and the object-side surface and the image-side surface of the second lens element 3 are aspheric surfaces.
The first lens 1 and the second lens 3 are made of chalcogenide glass.
Detailed optical data of this example are shown in table 1.
Table 1 detailed optical data for example 1
In this embodiment, the lens focal length f =6.8mm, the aperture FNO =1.0, the field angle FOV =31 °, the image height IMH =3.84mm, and the total optical length TTL =11.9 mm.
In this embodiment, please refer to fig. 2 for the MTF graph under the light of 8um to 14um, which shows that the MTF value of the lens is maintained at a higher level, and the resolution and the imaging quality are high.
Example 2
As shown in fig. 3, the surface convexoconcave and the refractive index of each lens of this example are substantially the same as those of the lens of example 1, and the optical parameters such as the curvature radius of the surface of each lens and the lens thickness are different.
Detailed optical data of this example are shown in table 2.
Table 2 detailed optical data of example 2
In this embodiment, the lens focal length f =6.8mm, the aperture FNO =1.0, the field angle FOV =31 °, the image height IMH =3.84mm, and the total optical length TTL =12 mm.
In this embodiment, please refer to fig. 4 for the MTF graph under the light of 8um to 14um, which shows that the MTF value of the lens is maintained at a higher level, and the resolution and the imaging quality are high.
Example 3
As shown in fig. 5, the surface convexoconcave and the refractive index of each lens of this example are substantially the same as those of the lens of example 1, and the optical parameters such as the curvature radius of the surface of each lens and the lens thickness are different.
Detailed optical data of this example are shown in table 3.
Table 3 detailed optical data for example 3
In this embodiment, the lens focal length f =6.8mm, the aperture value FNO =1.0, the field angle FOV =31 °, the image height IMH =3.84mm, and the total optical length TTL =13 mm.
In this embodiment, please refer to fig. 6 for the MTF graph under the light of 8um to 14um, which shows that the MTF value of the lens is maintained at a higher level, and the resolution and the imaging quality are high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. An infrared temperature measurement lens is characterized in that: the imaging lens sequentially comprises a first lens, a diaphragm and a second lens from an object side to an image side along an optical axis, wherein the first lens and the second lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the first lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has positive diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the first lens satisfies: nd1 is more than or equal to 1.8, wherein Nd1 is the refractive index of the first lens, and the second lens satisfies the following conditions: 4< | f2 | <7, where f2 is the focal length of the second lens.
2. The infrared temperature measurement lens of claim 1, wherein: the object side surface and the image side surface of the first lens are both aspheric surfaces.
3. The infrared temperature measurement lens of claim 1, wherein: the object side surface and the image side surface of the second lens are both aspheric surfaces.
4. The infrared temperature measurement lens of claim 1, wherein: the first lens and the second lens are made of chalcogenide glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121651914.6U CN215116951U (en) | 2021-07-20 | 2021-07-20 | Infrared temperature measurement lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121651914.6U CN215116951U (en) | 2021-07-20 | 2021-07-20 | Infrared temperature measurement lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215116951U true CN215116951U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121651914.6U Active CN215116951U (en) | 2021-07-20 | 2021-07-20 | Infrared temperature measurement lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215116951U (en) |
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2021
- 2021-07-20 CN CN202121651914.6U patent/CN215116951U/en active Active
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