KR200438209Y1 - Varifocal lens of the surveillance camera for visible and near infrared wavelength - Google Patents

Abstract

The present invention relates to a variable focus lens of a visible light beam and a near infrared wavelength band surveillance camera having excellent resolution in the visible wavelength band as well as in the near infrared wavelength band, and has a convex surface on the object side and a concave surface on the image side. 1 lens L1, a negative second lens L2 having a concave surface on the object side and an image side, and a positive third lens L3 having a convex surface on the object side and an image side, and installed movably in the optical axis direction A focus lens group; Positive fourth lens L4 having convex surfaces on object side and image side, Negative fifth lens L5 having concave surface on object side and convex surface on image side, Convex surface on object side and image side Positive sixth lens L6, negative seventh lens L7 having a convex surface on the object side and concave surface on the image side, positive eighth lens L8 having a convex surface on the object side and image side, object A zoom lens group composed of a ninth lens L95 having a convex surface on the side and an image side and a tenth lens L10 having a concave surface on the object side and a convex surface on the image side, the zoom lens group being movably installed in the optical axis direction; In the focal variable lens of the surveillance camera composed of the aperture (S) disposed between the third lens (L3) and the fourth lens (L4), the refractive index and the dispersion coefficient of the first to tenth lens to a predetermined value The MTF value, which is an evaluation item of lens resolution performance, is superior to that of existing lenses, and the MTF values in the visible and near infrared wavelength bands are not significantly different, so that the resolution performance can be maintained in the band. It is.

Description

VARIFOCAL LENS OF THE SURVEILLANCE CAMERA FOR VISIBLE AND NEAR INFRARED WAVELENGTH}

1 is an arrangement state of the variable focus lens of the visible light and near-infrared surveillance camera according to the present invention, Figure 1a is a long focal position, Figure 1b is a middle focal position, Figure 1c is a view showing a short focal position.

FIG. 2 is an MTF graph according to a variable focus state of a conventional lens, and FIGS. 2A and 2B are MTF graphs in a visible and near infrared wavelength band according to a long focal point position, and FIGS. 2C and 2D are visible according to an intermediate focal point position. MTF graphs in the light and near-infrared wavelength bands, and FIGS. 2E and 2F are MTF graphs in the visible and near-infrared wavelength bands according to short focal positions.

3 is an MTF graph according to a long focal position of the lens of the present invention, FIG. 3A is an MTF graph in the visible light wavelength band, and FIG. 3B is an MTF graph in the near infrared wavelength band.

4 is a diagram illustrating various aberration curves in the visible light wavelength band according to the long focal position of the lens of the present invention.

5 is a view showing various aberration curves in the near infrared wavelength band according to the long focal position of the lens of the present invention.

6 is an MTF graph according to the intermediate focus position of the lens of the present invention, FIG. 6A is an MTF graph in the visible light wavelength band, and FIG. 6B is an MTF graph in the near infrared wavelength band.

7 is a view showing various aberration curves in the visible light wavelength band according to the intermediate focus position of the lens of the present invention.

8 is a view showing various aberration curves in the near infrared wavelength band according to the intermediate focus position of the lens of the present invention.

9 is an MTF graph according to the short focal position of the lens of the present invention, FIG. 9A is an MTF graph in the visible light wavelength band, and FIG. 9B is an MTF graph in the near infrared wavelength band.

10 is a view showing various aberration curves in the visible light wavelength band according to the short focal position of the lens of the present invention.

11 is a view showing various aberration curves in the near infrared wavelength band according to the short focal position of the lens of the present invention.

<Description of the symbols for the main parts of the drawings>

L1 ~ L10: 1st-10 lenses

S: aperture

The present invention relates to a variable focus lens of a surveillance camera, and more particularly, to a variable focus lens of a visible and near infrared wavelength band surveillance camera having excellent resolution in the visible wavelength band as well as the near infrared wavelength band.

The focusable lens of a general surveillance camera is composed of a group of focus lenses having a positive and negative magnification and a zoom lens group that can move in the optical axis direction, using a visible light wavelength band during the day, and a separate lighting device such as a street lamp at night. To shoot the subject.

However, when the surveillance camera is used in a place where the street lamp is installed at night, the camera is exposed to the camera, and thus the surveillance camera has been used in an uneconomical state in terms of power consumption. Recently, with the development of camera technology that can monitor in the dark as well as bright places, it is possible to observe objects illuminated with a near-infrared light emitting diode (LED: Light Emitting Diode, wavelength band: 830nm to 900nm) that is invisible to the human eye. The demand for this is increasing.

However, in the case of such an infrared camera, since daylight is abundant in natural light, the infrared camera can be used without difficulty in visible light wavelength band, but at night when natural light is insufficient, resolution in the near infrared wavelength band is remarkably decreased.

Applicant has previously disclosed a surveillance camera capable of providing the best resolution in the visible wavelength band and the near infrared wavelength band as disclosed in Utility Model Registration Nos. 0393932 and 0393933 in order to solve the above problems with the focus-type lens. We have developed a lens for use. However, the above technique has been applied to a focus fixed lens, and has not been applied to a variable lens composed of a focus lens group and a zoom lens group to move the zoom lens group in the optical axis direction.

The present invention solves the problem of resolution deterioration in the near-infrared band caused by the wide-ranging wavelength (400 nm to 900 nm) of the focal length lens even in the variable-focus type lens, thereby providing the best resolution in the visible and near-infrared wavelength bands. An object of the present invention is to provide a variable focus lens of the surveillance camera that can provide.

In order to achieve the above object, the variable focus lens of the surveillance camera according to the present invention, the negative first lens (L1) having a convex surface on the object side and a concave surface on the image side, the concave surface on the object side and the image side A focus lens group composed of a negative second lens L2 and a positive third lens L3 having convex surfaces on the object side and the image side, the focus lens group being movable in the optical axis direction; Positive fourth lens L4 having convex surfaces on object side and image side, Negative fifth lens L5 having concave surface on object side and convex surface on image side, Convex surface on object side and image side Positive sixth lens L6, negative seventh lens L7 having a convex surface on the object side and concave surface on the image side, positive eighth lens L8 having a convex surface on the object side and image side, object A zoom lens group composed of a ninth lens L95 having a convex surface on the side and an image side and a tenth lens L10 having a concave surface on the object side and a convex surface on the image side, the zoom lens group being movably installed in the optical axis direction; In the variable focus lens of the surveillance camera consisting of an aperture (S) disposed between the third lens (L3) and the fourth lens (L4), the refractive index (N _d1 ~ N _d10 ) of the first to tenth lens ) And the dispersion coefficient (V _d1 ~ V _d10 ) is characterized in that the following range.

N _d1 = 1.80420, V _d1 = 46.5,

N _d2 = 1.72916, V _d2 = 54.7,

N _d3 = 1.80518, V _d3 = 25.5,

N _d4 = 1.61800, V _d4 = 63.4,

N _d5 = 1.76182, V _d5 = 26.6,

N _d6 = 1.48749, V _d6 = 70.4,

N _d7 = 1.83481, V _d7 = 42.7,

N _d8 = 1.48749, V _d8 = 70.4,

N _d9 = 1.48749, V _d9 = 70.4,

N _d10 = 1.83481, V _d10 = 42.7

In addition, in the surveillance camera lens according to the present invention, if the sign of the radius of curvature is expressed as negative (-) when the center is on the left side and positive (+) when the center is on the left side, The first lens L1 has a curvature radius of 26.838 mm, an effective diameter of 18.20 mm, an image curvature radius of 6.064 mm, an effective diameter of 11.54 mm, a center thickness D ₁ of 0.70 mm, and a second lens L1. The lens L2 has a radius of curvature of -22.137 mm and an effective diameter of 11.54 mm, an image curvature of 11.082 mm and an effective diameter of 10.90 mm, a center thickness D ₂ of 0.60 mm, and a third lens. (L3) has a curvature radius of 10.197 mm, an effective diameter of 11.70 mm, a curvature radius of an image side of 264.074 mm, an effective diameter of 11.70 mm, a center thickness (D ₃ ) of 2.29 mm, and a fourth lens (L4). ) Has a radius of curvature of 14.456mm, an effective diameter of 10.00mm, a radius of curvature of -14.456mm, an effective diameter of 10.00mm, and a center thickness of 2.3 (D ₄ ). The fifth lens L5 has a radius of curvature of -8.507mm and an effective diameter of 9.10mm, a radius of curvature of an image side of -16.715mm and an effective diameter of 10.00mm, and a center thickness (D ₅ ) of 0.60. The sixth lens L6 has a radius of curvature of 7.134 mm and an effective diameter of 9.60 mm, an radius of curvature of an image side of -46.333 mm and an effective diameter of 9.60 mm, and a center thickness (D ₆ ) of 2.686 mm. The seventh lens L7 has a curvature radius of 29.879 mm and an effective diameter of 9.60 mm, an image curvature radius of 8.339 mm and an effective diameter of 8.20 mm, and a center thickness D ₇ of 0.60 mm. The eighth lens L8 has a curvature radius of 21.077 mm and an effective diameter of 9.20 mm, an image curvature radius of -21.077 mm and an effective diameter of 9.20 mm, and a center thickness D ₈ of 1.50 mm. 9 The lens L9 has a radius of curvature of 14.420 mm, an effective diameter of 8.30 mm, an image of a curvature radius of -8.951 mm, an effective diameter of 8.30 mm, a center thickness of D ₉ of 2.00 mm, and a tenth thickness. Lens L10 is the The radius of curvature is -6.221mm, the effective diameter is 7.69mm, the radius of curvature of the upper side is -16.767mm, the effective diameter is 8.30mm, the center thickness (D ₁₀ ) is 0.55mm,

The center distance B ₁ between the first lens L1 and the second lens L2 is 4.969 mm, and the center distance B ₂ between the second lens L2 and the third lens L3 is 0.10 mm, the center distance B ₃ between the third lens L3 and the aperture S is 2.0213 mm in the long focus position, 1.396 mm in the middle focus position, 11.437 mm in the short focus position, and the aperture ( The center distance B ₄ between S) and the fourth lens L4 is 0.737 mm in the long focus position, 5.574 mm in the middle focus position, 10.624 mm in the short focus position, and the fourth lens L4 and the fifth lens. The center distance B ₅ between the lenses L5 is 1.014 mm, the center distance B ₆ between the fifth lens L5 and the sixth lens L6 is 0.10 mm, and the sixth lens L6. ) And the center distance B ₇ between the seventh lens L7 is 0.10 mm, and the center distance B ₈ between the seventh lens L7 and the eighth lens L8 is 1.205 mm. The center distance B ₉ between the eighth lens L8 and the ninth lens L9 is 0.10 mm, and the ninth lens L9 and the tenth The center distance B ₁₀ between the lenses L10 is 0.463 mm.

The radius of curvature of each of the first to tenth lenses L1 to L10 is within a range of ± 6 rings by the number of Newton's rings, and the center thickness of the first to tenth lenses L1 to L10 ( The allowable range of D ₁ to D ₁₀ is within a range of ± 0.1 mm, and the allowable range of the center interval B ₁ to B ₁₀ between the first to tenth lenses L1 to L10 and the aperture S is ±. 0.1mm range, and the brightness fno of the first to tenth lenses (L1 to L10) is characterized in that within the range of 1.4 to 3.5.

In addition, in the variable lens of the surveillance camera according to the present invention, the first to tenth lenses (L1 to L10), the radius of curvature, the effective diameter, the center thickness (D ₁ ~ D ₁₀ ) and the center interval (B ₁ ~ B) ₁₀ ) n times the curvature radius, the effective diameter, the center thickness and the center interval, wherein n is characterized in that in the range of 0.5 to 1.5.

Hereinafter, with reference to the accompanying drawings will be described in more detail the focus variable lens of the surveillance camera according to the present invention.

1a to 1c is a view showing the arrangement of the variable focus lens of the visible light and near-infrared surveillance camera according to the present invention, Figure 1a is a long focal point position (TELE), Figure 1b is a long focus according to the transfer position of the zoom lens group The position MID, FIG. 1C shows a state located at the short focal position WIDE.

The variable focus lens according to the present invention has a wide viewing angle of 91 ° and an aperture ratio of F2.4. In addition, the variable focus lens of the surveillance camera according to the present invention, for the visible light and near-infrared surveillance that captures the object by natural light such as sunlight during the day and the subject by infrared light emitted from an infrared illuminating device (not shown) at night The camera's variable focus lens.

In general, in order for a lens to exhibit good resolution in the visible and near infrared wavelength bands, the lens arrangement, the shape of the lens, as well as the refractive index (N _d ) and the dispersion coefficient (V _d ) of the lens are important factors. In addition, it also plays an important role in the curvature radius, the effective diameter, the center thickness (D) and the center distance (B) of the lens.

As shown in FIG. 1, the variable focus lens of the surveillance camera according to the present invention includes a focus lens group formed by sequentially arranging first to third lenses L1 to L3 from an object (subject) side to an image side, and an object. The zoom lens group formed by sequentially arranging the fourth to tenth lenses L4 to L10 from the side to the image side is formed on the central axis of the light, and the third lens L3 of the focus lens group and the fourth lens of the zoom lens group An aperture S for selectively converging the light passing through the focus lens group is disposed between the blocks L4, and a filter L11 and a cover glass L12 are disposed after the tenth lens L10 of the zoom lens group. After that, the image sensor surface is arranged.

The focus lens group consisting of the first to third lenses L1 to L3 is composed of negative and positive lenses, so that the entire focusing lens group is formed to secure a wide viewing angle from the object side and to secure a sufficient postfocal distance. The fourth to tenth lenses L4 to L10 are formed of negative and positive lenses to form a positive zoom lens group in which the entire group diverges from the focus lens and converges the light beam passing through the aperture.

In addition, the focus lens group of the first to third lenses L1 to L3 and the zoom lens group of the fourth to ten lenses L4 to L10 are spaced apart from each other by a predetermined interval.

The present inventors, by a number of experiments, as a variable focus lens having the arrangement as described above,

Refractive index (N _{d1 ~ 10} ) and dispersion coefficient (V _{d1 ~ 10} ) of the first to ten lenses (L1 to L10) are configured with the following values,

N _d1 = 1.80420, V _d1 = 46.5,

N _d2 = 1.72916, V _d2 = 54.7,

N _d3 = 1.80518, V _d3 = 25.5,

N _d4 = 1.61800, V _d4 = 63.4,

N _d5 = 1.76182, V _d5 = 26.6,

N _d6 = 1.48749, V _d6 = 70.4,

N _d7 = 1.83481, V _d7 = 42.7,

N _d8 = 1.48749, V _d8 = 70.4,

N _d9 = 1.48749, V _d9 = 70.4,

N _d10 = 1.83481, V _d10 = 42.7

When the sign of the radius of curvature is expressed as negative (-) when the center is on the left side and positive (+) when the center is on the left side, the first lens L1 has a radius of curvature of the object side. 26.838 mm, the effective diameter is 18.20 mm, the radius of curvature of the image side is 6.064 mm, the effective diameter is 11.54 mm, the center thickness (D ₁ ) is 0.70 mm, and the second lens (L2) has the radius of curvature of the object side- 22.137mm, effective diameter is 11.54mm, the radius of curvature of the image side is 11.082mm, the effective diameter is 10.90mm, the center thickness (D ₂ ) is 0.60mm, the third lens (L3) has a radius of curvature of the object side is 10.197mm The effective diameter is 11.70 mm, the radius of curvature of the image side is 264.074 mm, the effective diameter is 11.70 mm, the center thickness D ₃ is 2.29 mm, and the fourth lens L4 has a radius of curvature of the object side of 14.456 mm, the effective diameter. Is 10.00mm, the radius of curvature of the image side is -14.456mm, the effective diameter is 10.00mm, the center thickness D ₄ is 2.30mm, and the fifth lens L5 has the radius of curvature of the object side -8. 507mm, effective diameter is 9.10mm, the radius of curvature of the image side is -16.715mm, the effective diameter is 10.00mm, the center thickness (D ₅ ) is 0.60mm, and the sixth lens (L6) has the radius of curvature of the object side at 7.134mm. The effective radius is 9.60 mm, the radius of curvature of the image side is -46.333 mm, the effective diameter is 9.60 mm, the center thickness (D ₆ ) is 2.686 mm, and the seventh lens (L7) has a radius of curvature of the object side of 29.879 mm, The effective diameter is 9.60mm, the radius of curvature of the image side is 8.339mm, the effective diameter is 8.20mm, the center thickness (D ₇ ) is 0.60mm, and the eighth lens (L8) has a radius of curvature of the object side of 21.077mm, the effective diameter of 9.20 mm, the radius of curvature of the image side is -21.077 mm, the effective diameter is 9.20 mm, the center thickness (D ₈ ) is 1.50 mm, and the ninth lens (L9) has the radius of curvature of the object side of 14.420 mm and the effective diameter of 8.30 mm. mm, the radius of curvature of the image side is -8.951mm, the effective diameter is 8.30mm, the center thickness (D ₉ ) is 2.00mm, the tenth lens (L10) has a radius of curvature of the object side is -6.221mm, the effective diameter is 7.69 mm, upper side The radius of curvature is made of a -16.767mm, and the effective diameter is 8.30mm, a center thickness (D ₁₀₎ 0.55mm,

In addition, the center distance B ₁ between the first lens L1 and the second lens L2 is 4.969 mm, and the center distance B between the second lens L2 and the third lens L3. ₂ ) is 0.10mm, the center distance (B ₃ ) between the third lens (L3) and the aperture (S) is 2.0213mm in the long focus position, 1.396mm in the middle focus position, 11.437mm in the short focus position, The center distance B ₄ between the aperture S and the fourth lens L4 is 0.737 mm in the long focus position, 5.574 mm in the middle focus position, 10.624 mm in the short focus position, and the fourth lens L4. And the center distance B ₅ between the fifth lens L5 is 1.014 mm, and the center distance B ₆ between the fifth lens L5 and the sixth lens L6 is 0.10 mm, and the sixth The center distance B ₇ between the lens L6 and the seventh lens L7 is 0.10 mm, and the center distance B ₈ between the seventh lens L7 and the eighth lens L8 is 1.205 mm. , and the center distance (B ₉₎ is 0.10mm between the eighth lens (L8) of the ninth lens (L9), the ninth lens (L9) Claim 10, the center distance (B ₁₀₎ is 0.463mm between the lens (L10), I found out that it can have a high resolution in a broadband of 400nm ~ 900nm.

This is summarized in Table 1 and Table 2 below.

<Table 1>

lens Refractive index (Nd) Dispersion coefficient (Vd) Bending Radius (mm) Effective diameter (mm) Center thickness (D) (mm) First lens L1 1.80420 46.5 Object side 26.838 18.20 0.70 Upper side 6.064 11.54 Second lens (L2) 1.72916 54.7 Object side -22.137 11.54 0.60 Upper side 11.082 10.90 Third lens (L3) 1.80518 25.5 Object side 10.197 11.70 2.29 Upper side 264.074 11.70 Fourth lens (L4) 1.61800 63.4 Object side 14.456 10.00 2.30 Upper side -14.456 10.00 Fifth lens (L5) 1.76182 26.6 Object side -8.507 9.10 0.60 Upper side -16.715 10.00 Sixth lens (L6) 1.48749 70.4 Object side 7.134 9.60 2.686 Upper side -46.333 9.60 Seventh lens (L7) 1.83481 42.7 Object side 29.879 9.60 0.60 Upper side 8.339 8.20 8th lens (L8) 1.48749 70.4 Object side 21.077 9.20 1.50 Upper side -21.077 9.20 9th lens (L9) 1.48749 70.4 Object side 14.420 8.30 2.00 Upper side -8.951 8.30 10th lens (L10) 1.89481 42.7 Object side -6.221 7.69 0.55 Upper side -16.767 8.30

<Table 2>

lens Center distance (B) (mm) Between the first lens L1 and the second lens L2 4.969 Between the second lens L2 and the third lens L3 0.10 Between the third lens L3 and the aperture S Long Focus Position 2.0213 Middle Focus Position 1.396 Short Focus Position 11.437 Between the iris S and the fourth lens L4 Long focus position 0.737 Middle focus position 5.574 Short focus position 10.624 Between the fourth lens L4 and the fifth lens L5 1.014 Between the fifth lens L5 and the sixth lens L6 0.10 Between the sixth lens L6 and the seventh lens L7 0.10 Between the seventh lens L7 and the eighth lens L8 1.205 Between the eighth lens L8 and the ninth lens L9 0.10 Between the ninth lens L9 and the tenth lens L10 0.463

In addition, the radius of curvature of each of the first to tenth lenses L1 to L10 is within the range of ± 6 rings by the number of Newton's rings, and is the center of the first to tenth lenses L1 to L10. The allowable range of the thicknesses D ₁ to D ₁₀ is within a range of ± 0.1 mm, and the allowance of the center interval B ₁ to B ₁₀ between the first to tenth lenses L1 to L10 and the aperture S is allowed. The range is in the range of ± 0.1 mm, and the brightness fno of the first to tenth lenses L1 to L10 is more preferably in the range of 1.4 to 3.5.

In addition, the first to tenth lenses L1 to L10 may have a radius of curvature, an effective diameter, a radius of curvature n, an effective diameter, and a center thickness n times the center thicknesses D ₁ to D ₁₀ and the center intervals B ₁ to B ₁₀ . And a central interval, wherein n may be in the range of 0.5 to 1.5.

The optical performance of the variable focus lens of the surveillance camera having the above conditions will be described with reference to FIGS. 2 to 11.

FIG. 2 is an MTF graph of a conventional focal variable lens, and FIGS. 2A and 2B are visible light beams at a long focal point position and an MTF graph in a near infrared wavelength band, and FIGS. 2C and 2D are visible light beams at a mid focal point position. And MTF graphs in the near infrared wavelength band, and FIGS. 2E and 2F are MTF graphs in the visible light and near infrared wavelength band according to the short focal position. 3, 6 and 9 are MTF graphs according to the long focus position, the middle focus position and the short focus position of the variable focus lens of the present invention, and FIGS. 3A, 6A and 9A are MTF graphs in the visible light wavelength band. 3B, 6B and 9B are MTF graphs in the near infrared wavelength band.

The MTF (Modulation Transfer Function) graph is a curve indicating numerically the overlapping degree when light originating from two points of an object passes through the lens and forms on the imaging surface. As shown in FIGS. 3, 6, and 9, the present invention According to the lens, it can be seen that the MTF values according to the long focal position, the intermediate focal position, and the short focal position exhibit excellent values not only in the visible wavelength band but also in the near infrared wavelength band.

4, 7 and 10 are various aberration curves in the visible light wavelength band according to the long focal position, the middle focal position and the short focal position of the lens of the present invention, (a) astigmatism curve, (b Is a vertical spherical aberration curve, (c) is a focal shift graph according to color (wavelength), (d) is a distortion aberration curve, and (e) is a lateral chromatic aberration curve. 5, 8 and 11 are various aberration curves in the near infrared wavelength band according to the long focal position, the middle focal position and the short focal position of the present invention lens, (a) is astigmatism curve, (b) is a vertical sphere The surface aberration curve (c) shows a focal shift graph according to color (wavelength), (d) shows a distortion aberration curve, and (e) shows a lateral chromatic aberration curve.

As shown in Figs. 4, 5, 7, 8, 10 and 11, the variable focus lens of the surveillance camera according to the present invention having the conditions as described above has a good aberration correction state, It can be seen that the resolution of the periphery is also suitable.

As described above, according to the variable focus lens of the surveillance camera according to the present invention, the MTF value, which is an evaluation item of the lens resolution performance according to the long focus position, the middle focus position, and the short focus position, is much better than the MTF value of the existing lenses. In addition, the MTF values in the visible and near infrared wavelength bands are not significantly different, and are improved to maintain the constant resolution performance in the band. The best resolution can be provided in the wavelength band and the near infrared wavelength band.

Claims (3)

A negative first lens L1 having a convex surface on the object side and a concave surface on the image side, A negative second lens L2 having a concave surface on the object side and an image side and a positive convex surface on the object side and image side A focal lens group composed of a third lens L3 movably installed in an optical axis direction; Positive fourth lens L4 having convex surfaces on object side and image side, Negative fifth lens L5 having concave surface on object side and convex surface on image side, Convex surface on object side and image side Positive sixth lens L6, negative seventh lens L7 having a convex surface on the object side and concave surface on the image side, positive eighth lens L8 having a convex surface on the object side and image side, object A zoom lens group composed of a ninth lens L95 having a convex surface on the side and an image side and a tenth lens L10 having a concave surface on the object side and a convex surface on the image side, the zoom lens group being movably installed in the optical axis direction; In the focal variable lens of the visible light and the near infrared surveillance camera composed of the aperture (S) disposed between the third lens (L3) and the fourth lens (L4), The refractive index (N _d1 ~ N _d10 ) and the dispersion coefficient (V _d1 ~ V _d10 ) of the first to the tenth lens is in the following range, the variable focus type lens of the visible and near infrared surveillance cameras. N _d1 = 1.80420, V _d1 = 46.5, N _d2 = 1.72916, V _d2 = 54.7, N _d3 = 1.80518, V _d3 = 25.5, N _d4 = 1.61800, V _d4 = 63.4, N _d5 = 1.76182, V _d5 = 26.6, N _d6 = 1.48749, V _d6 = 70.4, N _d7 = 1.83481, V _d7 = 42.7, N _d8 = 1.48749, V _d8 = 70.4, N _d9 = 1.48749, V _d9 = 70.4, N _d10 = 1.83481, V _d10 = 42.7 The method of claim 1, The sign of the radius of curvature with respect to the central axis of the light is expressed as negative when its center is on the left and positive when it is on the right, The first lens L1 has a curvature radius of 26.838 mm and an effective diameter of 18.20 mm, an image curvature radius of 6.064 mm and an effective diameter of 11.54 mm, and a center thickness D ₁ of 0.70 mm. The second lens L2 has a radius of curvature of -22.137 mm and an effective diameter of 11.54 mm on the object side, an image curvature radius of 11.082 mm and an effective diameter of 10.90 mm, and a center thickness D ₂ of 0.60 mm. The third lens L3 has a curvature radius of 10.197 mm and an effective diameter of 11.70 mm, an image curvature radius of 264.074 mm and an effective diameter of 11.70 mm, and a center thickness D ₃ of 2.29 mm. The fourth lens L4 has a radius of curvature of 14.456 mm, an effective diameter of 10.00 mm, an radius of curvature of an image side of -14.456 mm, an effective diameter of 10.00 mm, and a center thickness (D ₄ ) of 2.30 mm. The fifth lens L5 has a radius of curvature of -8.507mm and an effective diameter of 9.10mm, a curvature radius of an image side of -16.715mm and an effective diameter of 10.00mm, and a center thickness (D ₅ ) of 0.60mm. , The sixth lens L6 has a radius of curvature of 7.134 mm and an effective diameter of 9.60 mm, an radius of curvature of an image side of -46.333 mm and an effective diameter of 9.60 mm, and a center thickness (D ₆ ) of 2.686 mm. The seventh lens L7 has a curvature radius of 29.879 mm and an effective diameter of 9.60 mm, a curvature radius of an image side of 8.339 mm, an effective diameter of 8.20 mm, and a center thickness D ₇ of 0.60 mm. The eighth lens L8 has a curvature radius of 21.077 mm and an effective diameter of 9.20 mm on the object side, a curvature radius of -21.077 mm and an effective diameter of 9.20 mm on an image side, and a center thickness D ₈ of 1.50 mm. The ninth lens L9 has a radius of curvature of 14.420 mm and an effective diameter of 8.30 mm, an radius of curvature of an image side of -8.951 mm, an effective diameter of 8.30 mm, and a center thickness (D ₉ ) of 2.00 mm. The tenth lens L10 has a radius of curvature of -6.221 mm and an effective diameter of 7.69 mm on the side of the object, a radius of curvature of -16.767 mm on an image side of 8.30 mm, and a center thickness (D ₁₀ ) of 0.55 mm. , The center distance B ₁ between the first lens L1 and the second lens L2 is 4.969 mm, and the center distance B ₂ between the second lens L2 and the third lens L3 is 0.10 mm, the center distance B ₃ between the third lens L3 and the aperture S is 2.0213 mm in the long focus position, 1.396 mm in the middle focus position, 11.437 mm in the short focus position, and the aperture ( The center distance B ₄ between S) and the fourth lens L4 is 0.737 mm in the long focus position, 5.574 mm in the middle focus position, 10.624 mm in the short focus position, and the fourth lens L4 and the fifth lens. The center distance B ₅ between the lenses L5 is 1.014 mm, the center distance B ₆ between the fifth lens L5 and the sixth lens L6 is 0.10 mm, and the sixth lens L6. ) And the center distance B ₇ between the seventh lens L7 is 0.10 mm, and the center distance B ₈ between the seventh lens L7 and the eighth lens L8 is 1.205 mm. The center distance B ₉ between the eighth lens L8 and the ninth lens L9 is 0.10 mm, and the ninth lens L9 and the tenth The center distance (B ₁₀ ) between the lens (L10) is 0.463mm, The radius of curvature of each of the first to tenth lenses L1 to L10 is within a range of ± 6 rings by the number of Newton's rings, and the center thickness of the first to tenth lenses L1 to L10 ( The allowable range of D ₁ to D ₁₀ is within a range of ± 0.1 mm, and the allowable range of the center interval B ₁ to B ₁₀ between the first to tenth lenses L1 to L10 and the aperture S is ±. The range of 0.1mm, and the brightness fno of the first to tenth lenses (L1 to L10) is in the range of 1.4 to 3.5, the variable focus lens of the visible light and near infrared surveillance camera. The method of claim 2, The first to tenth lenses L1 to L10 may have a radius of curvature, an effective diameter, a center radius (D ₁ to D ₁₀ ), and a center radius (B ₁ to B ₁₀ ) of n times the radius of curvature, an effective diameter, a center thickness, and a center. It has a spacing, wherein n is in the range of 0.5 to 1.5, the variable focus lens of the visible light and near infrared surveillance camera.

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