Infrared confocal lens and imaging equipment
An infrared confocal and lens technology, applied in the field of imaging lenses, can solve the problems of a large number of lenses, which cannot meet the needs of low-cost and miniaturized markets, and achieve the effect of small size, excellent optical performance, and corrected chromatic aberration
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no. 1 example
[0084] see figure 1 , which is a schematic structural view of the infrared confocal lens 100 provided in the first embodiment of the present invention, the infrared confocal lens 100 includes: a first lens L1, a second lens L2, Stop ST, third lens L3, fourth lens L4, filter G1.
[0085] The first lens L1 has negative refractive power, its object side S1 is concave, and its image side S2 is concave at the near optical axis;
[0086] The second lens L2 has a positive refractive power, and its object side S3 and image side S4 are both convex;
[0087] The third lens L3 has a positive refractive power, and its object side S5 and image side S6 are both convex;
[0088] The fourth lens L4 has a negative refractive power, its object side S7 is a concave surface, its image side S8 is a convex surface near the optical axis, and a concave surface away from the optical axis, that is, the image side S8 of the fourth lens has an inflection point .
[0089] Wherein, the first lens L1 , ...
no. 2 example
[0100] see Figure 5 , which is a schematic structural view of the infrared confocal lens 200 provided in the second embodiment of the present invention, the structure of the infrared confocal lens 200 in the second embodiment of the present invention is roughly the same as that of the infrared confocal lens 100 in the first embodiment The same, but the difference is that the radius of curvature and material selection of each lens are different, and the relevant parameters of each lens are shown in Table 3.
[0101] table 3
[0102]
[0103] Table 4 shows the aspherical parameters of the infrared confocal lens 200 in this embodiment.
[0104] Table 4
[0105]
[0106] In this embodiment, the field curvature diagram of the infrared confocal lens 200, the MTF diagram in the visible light band and the MTF diagram in the infrared band are respectively as follows Figure 6 , Figure 7 and Figure 8 shown.
[0107] Depend on Figure 6 It can be seen that the field curvatu...
no. 3 example
[0110] see Figure 9 , which is a schematic structural diagram of the infrared confocal lens 300 provided in the third embodiment of the present invention, the structure of the infrared confocal lens 300 provided in the third embodiment of the present invention is the same as that of the infrared confocal lens 100 in the first embodiment They are roughly the same, except that the image side S8 of the fourth lens of the infrared confocal lens 300 in this embodiment is concave and has no inflection point, which is easier to process. In addition, the radius of curvature, thickness, and air gap of each lens are also different, and the relevant parameters of each lens are shown in Table 5.
[0111] table 5
[0112]
[0113] Table 6 shows the aspherical parameters of the infrared confocal lens 300 in this embodiment.
[0114] Table 6
[0115]
[0116] In this embodiment, the field curvature diagram of the infrared confocal lens 300, the MTF diagram in the visible light band...
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