A linearly dispersive optical spectrum confocal linearly dispersive lens

Abstract

The application discloses a linear dispersion spectrum confocal linear dispersion lens, which sequentially comprises a light splitting prism, a first lens assembly, a fifth lens, a diaphragm, a sixth lens, a second lens assembly and a tenth lens from an object side to an image side along an optical axis; the linear dispersion spectrum confocal linear dispersion lens is configured to meet the following conditions: an F number is 1.67, a focal length meets 150mm<=F1<=250mm, an object side numerical aperture meets 0.35<=NA1<=0.45, an object side line length meets 8mm<=L1<=12mm, an image side numerical aperture meets 0.23<=NA2<=0.3, and an image side line length meets 12mm<=L2<=15mm. The first lens assembly changes a light beam from a diffusion state to a converging state; the fifth lens and the sixth lens diverge the converging light beam and compensate for non-linear dispersion of the first lens assembly; the second lens assembly converges the light beam again; and the tenth lens expands a divergence angle of the light beam and corrects accumulated dispersion nonlinearity and aberration. It can be seen that the dispersion lens realizes a larger numerical aperture and a larger scanning line length at a light source end, the nonlinearity is only 0.5%, reaches an ultra-high precision standard, and the linear performance is extreme.

Claims

1. A linear dispersive spectral confocal linear dispersive lens, characterized in that, Along the optical axis, from the object side to the image side, it successively includes: a beam splitter prism, a first lens assembly with a positive optical focal length, a fifth lens with a negative optical focal length, an aperture stop, a sixth lens with a negative optical focal length, a second lens assembly with a positive optical focal length, and a tenth lens with a negative optical focal length; the linear dispersion spectral confocal linear dispersion lens is configured to satisfy: the F-number is 1.67, 150 mm ≤ F1 ≤ 250 mm, 0.35 ≤ NA1 ≤ 0.45, 8 mm ≤ L1 ≤ 12 mm, 0.23 ≤ NA2 ≤ 0.3, 12 mm ≤ L2 ≤ 15 mm, where F1 is the focal length, NA1 is the object-side numerical aperture, L1 is the object-side line length, NA2 is the image-side numerical aperture, and L2 is the image-side line length.

2. The linear dispersive spectral confocal linear dispersive lens according to claim 1, characterized in that: The first lens assembly includes a first lens, a second lens, a third lens, and a fourth lens; the object side surface of the first lens is concave, and the image side surface is convex; the object side surface of the second lens is convex, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave.

3. A linear dispersive spectral confocal linear dispersive lens according to claim 2, characterized in that: The refractive index N1 of the first lens satisfies 1.40 < N1 < 1.65, the Abbe number Vd1 satisfies Vd1 > 60, and the optical power A1 satisfies 0.005 < A1 < 0.01; the refractive index N2 of the second lens satisfies 1.40 < N2 < 1.65, the Abbe number Vd2 satisfies Vd2 > 60, and the optical power A2 satisfies 0.005 < A2 < 0.01; the refractive index N3 of the third lens satisfies 1.40 < N3 < 1.65, the Abbe number Vd3 satisfies Vd3 > 60, and the optical power A3 satisfies 0.005 < A3 < 0.015; the refractive index N4 of the fourth lens satisfies 1.65 < N4 < 1.85, the Abbe number Vd4 satisfies 50 > Vd = 40, and the optical power A4 satisfies 0.005 < A4 < 0.015; the air gap T1 between the first lens and the second lens satisfies 0.2 mm < T1 < 12 mm, the air gap T2 between the second lens and the third lens satisfies 0.2 mm < T2 < 1 mm, and the air gap T3 between the third lens and the fourth lens satisfies 0.2 mm < T3 < 1 mm.

4. A linear dispersive spectral confocal linear dispersive lens according to claim 2, characterized in that: The lens materials of the first lens, the second lens, and the third lens are all heavy crown glass, and the lens material of the fourth lens is lanthanum flint glass.

5. A linear dispersive spectral confocal linear dispersive lens according to claim 1, characterized in that: The second lens assembly includes a seventh lens, an eighth lens, and a ninth lens; the object side surface of the seventh lens is convex, and the image side surface is convex; the object side surface of the eighth lens is convex, and the image side surface is convex; the object side surface of the ninth lens is convex, and the image side surface is concave.

6. A linear dispersive spectral confocal linear dispersive lens according to claim 5, characterized in that: The refractive index N7 of the seventh lens satisfies 1.40 < N7 < 1.65, the Abbe number Vd7 satisfies Vd7 > 60, and the optical power A7 satisfies 0.005 < A7 < 0.01; the refractive index N8 of the eighth lens satisfies 1.40 < N8 < 1.65, the Abbe number Vd8 satisfies Vd8 > 60, and the optical power A8 satisfies 0.005 < A8 < 0.015; the refractive index N9 of the ninth lens satisfies 1.65 < N9 < 1.85, the Abbe number Vd9 satisfies 50 > Vd9 > 40, and the optical power A9 satisfies 0.005 < A9 < 0.015; the air gap T between the seventh lens and the eighth lens satisfies 0.2mm < T7 < 1mm, and the air gap T8 between the eighth lens and the ninth lens satisfies 0.2mm < T8 < 1mm.

7. A linear dispersive spectral confocal linear dispersive lens according to claim 5, characterized in that: The lens materials of the seventh lens and the eighth lens are both heavy crown glass, and the lens material of the ninth lens is lanthanum flint glass.

8. A linear dispersive spectral confocal linear dispersive lens according to claim 1, characterized in that: The object side of the fifth lens is a plane, and the image side is a concave surface; the refractive index N5 of the fifth lens satisfies 1.65 < N5 < 1.85, the Abbe number Vd5 satisfies 30 > Vd5 > 23, and the optical power A5 satisfies -0.03 < A5 < -0.01; the air gap T4 between the fifth lens and the first lens assembly satisfies 0.2mm < T4 < 5mm, the air gap T5 between the fifth lens and the sixth lens satisfies 0.2mm < T5 < 10mm, and the lens material of the fifth lens is heavy flint glass.

9. A linear dispersive spectral confocal linear dispersive lens according to claim 1, characterized in that: The object side of the sixth lens is a concave surface, and the image side is a concave surface; the refractive index N6 of the sixth lens satisfies 1.65 < N6 < 1.85, the Abbe number Vd6 satisfies 30 > Vd6 > 23, and the optical power A6 satisfies -0.03 < A6 < -0.01; the air gap T6 between the sixth lens and the second lens assembly satisfies 5mm < T6 < 60mm, and the lens material of the sixth lens is heavy flint glass.

10. A linear dispersive spectral confocal linear dispersive lens according to claim 1, characterized in that: The object side of the tenth lens is a plane, and the image side is a concave surface; the refractive index N10 of the tenth lens satisfies 1.65 < N10 < 1.85, the Abbe number Vd10 satisfies 30 > Vd10 > 23, and the optical power A10 satisfies -0.03 < A10 < -0.01; the air gap T9 between the tenth lens and the second lens assembly satisfies 0.2mm < T9 < 5mm, the working distance TC from the tenth lens to the image plane satisfies 30mm < TC < 70mm, and the lens material of the tenth lens is heavy flint glass.

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