CN211375162U - Large-aperture high-low temperature confocal optical lens - Google Patents

Abstract

The utility model discloses a confocal optical lens of high low temperature of large aperture, this device includes the first glass spherical lens L1 of the positive focal power of convex-concave that sets gradually along light incident direction, the second spherical lens L2 of convex-concave negative focal power, the third glass spherical lens L3 of biconcave negative focal power, the fourth glass spherical lens L4 of plano-convex positive focal power, the fifth spherical lens L5 of plano-convex positive focal power, the sixth spherical lens L6 of biconvex positive focal power, the third glass spherical lens L7 of biconcave negative focal power, the sixth spherical lens L8 of biconvex positive focal power, the sixth spherical lens L9 of biconcave positive focal power; the lens L7 and the lens L8 are cemented together to form a cemented lens. The lens adopts a 9G structure, and tolerance sensitivity of the lens is reduced through reasonable focal power distribution and material distribution; meanwhile, the device is not defocused under the environmental condition of minus 40 ℃ to +70 ℃.

Description

Large-aperture high-low temperature confocal optical lens

Technical Field

The utility model discloses mainly to the security protection control and guarantee at-40 deg.C ~ 70 deg.C large aperture optical lens that not defocus.

Background

At present, the domestic security monitoring is developed towards miniaturization, multiple functions and strong environment adaptability, and under the form of extremely strong domestic competition, the fixed-focus lens cannot meet the requirements of customers in different regions, for example, the market in northeast China requires a designed monitoring device which is placed outdoors and cannot be out of focus all the year round, the temperature in northeast China is always minus 30 ℃ in winter, and the highest temperature in summer can reach about 31 ℃. Considering the circuit heating factor of the monitoring camera, it becomes necessary to design an optical imaging device with large aperture and no deviation of focal plane in-40 deg.C to +70 deg.C.

SUMMERY OF THE UTILITY MODEL

The utility model mainly provides a security protection monitoring is at-40- +70 ℃ large aperture optical lens that not defocus.

In order to meet the design requirements, the utility model provides a technical scheme as follows:

the high-low temperature confocal optical device with the focal length of 11.6mm and a 9G full-glass structure comprises a convex-concave positive-focal-power first glass spherical lens L1, a convex-concave negative-focal-power second spherical lens L2, a double-concave negative-focal-power third glass spherical lens L3, a plano-convex positive-focal-power fourth glass spherical lens L4, a plano-convex positive-focal-power fifth spherical lens L5, a double-convex positive-focal-power sixth spherical lens L6, a double-concave negative-focal-power third glass spherical lens L7, a double-convex positive-focal-power sixth spherical lens L8 and a double-concave positive-focal-power sixth spherical lens L9 which are sequentially arranged in the light incidence direction; the focal length, the refractive index and the surface radius of the nine lenses of the device respectively satisfy the conditions of the following table 1:

f1＝-33.91±5％	n1＝1.91±5％	R11＝12.667±5％	R12＝17.992±5％
				f2＝-15.11±5％	n2＝1.60±5％	R21＝43.321±5％	R22＝7.534±5％
f3＝-10.061±5％	n3＝1.76±5％	R31＝-9.960±5％	R32＝35.767±5％
				f4＝16.97±5％	n4＝1.88±5％	R41＝Infinity	R42＝-15.075±5％
f5＝-29.69±5％	n5＝1.81±5％	R51＝24.245±5％	R52＝Infinity
				f6＝23.26±5％	n6＝1.50±5％	R61＝15.862±5％	R62＝-38.867±5％
f7＝-9.44±5％	n4＝1.72±5％	R71＝-36.493±5％	R72＝8.481±5％
				f8＝12.80±5％	n4＝1.46±5％	R81＝8.481±5％	R82＝-15.610±5％
f9＝28.49±5％	n4＝1.59±5％	R91＝13.067±5％	R92＝45.721±5％

TABLE 1

In the above table: f. of₁-f₉The focal lengths of the first glass spherical lens L1 and the ninth glass spherical lens 9 respectively correspond to the focal lengths in sequence; n is₁-n₉The refractive indexes of the first glass spherical lens L1 and the ninth glass spherical lens L9 respectively correspond in sequence; the R is₁₁And R₁₂Corresponding to the curvature radius of the first glass spherical lens L1, R₂₁And R₂₂Corresponding to the curvature radius of the third spherical glass lens L2, R₃₁And R₃₂Corresponding to the radius of curvature of the fourth spherical glass lens L4, R₅₁And R₅₂Corresponding to the curvature radius of the third spherical glass lens L5, R₆₁And R₆₂Corresponding to the radius of curvature of the fourth spherical glass lens L6, R₇₁And R₇₂Corresponding to the curvature radius of the third spherical glass lens L7, R₈₁And R₈₂Corresponding to the fourth glass sphere spherical lens L8, R₉₁And R₉₂Corresponds to the radius of curvature of the third aspherical lens L9, wherein "-" indicates that the direction is a negative direction.

The utility model discloses FNO value satisfy the condition formula:

where f is the system focal length and D is the entrance pupil diameter.

The utility model discloses a field of view angle FOV satisfies the conditional formula:

40°≤FOV≤60°。

the utility model discloses an optics total length TTL and camera lens focal length value EFL satisfy the condition formula:

the optical lens provided by the utility model can effectively ensure that the utility model can not defocus in the temperature change of-40 ℃ to 70 ℃; the large aperture makes the lens can form clear image under weak light.

Drawings

Fig. 1 is a lens assembly diagram according to a first embodiment of the present invention.

Fig. 2 is a schematic view of an optical path according to a first embodiment of the present invention;

FIG. 3 is a MTF chart of the present invention under a low temperature of 20 deg.C;

FIG. 4 is a MTF chart of the present invention under the environment of normal temperature-40 deg.C;

fig. 5 is an MTF graph of the present invention at a high temperature of 70 ℃.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.

Referring to fig. 1 and 2, the present invention includes convex-concave positive lights arranged in sequence along the incident direction of lightA first glass spherical lens L1 with focal power, a second spherical lens L2 with convex-concave negative focal power, a third glass spherical lens L3 with double concave negative focal power, a fourth glass spherical lens L4 with plano-convex positive focal power, a fifth spherical lens L5 with plano-convex positive focal power, a sixth spherical lens L6 with double convex positive focal power, a third glass spherical lens L7 with double concave negative focal power, a sixth spherical lens L8 with double convex positive focal power and a sixth spherical lens L9 with double concave positive focal power; wherein the lens L1 comprises opposite R₁₁Face and R₁₂The lens L2 includes opposite R₂₁Face and R₂₂The lens L3 includes opposite R₃₁Face and R₃₂The lens L4 includes opposite R₄₁Face and R₄₂The lens L5 includes opposite R₅₁Face and R₅₂The lens L6 includes opposite R₆₁Face and R₆₂The lens L7 includes opposite R₇₁Face and R₇₂The lens L8 includes opposite R₈₁Face and R₈₂The lens L9 includes opposite R₉₁Face and R₉₂And (5) kneading.

When the focal length, refractive index and surface radius of the nine lenses of the utility model are respectively satisfied with the following conditions of 1:

f1＝-33.91±5％	n1＝1.91±5％	R11＝12.667±5％	R12＝17.992±5％
				f2＝-15.11±5％	n2＝1.60±5％	R21＝43.321±5％	R22＝7.534±5％
f3＝-10.061±5％	n3＝1.76±5％	R31＝-9.960±5％	R32＝35.767±5％
				f4＝16.97±5％	n4＝1.88±5％	R41＝Infinity	R42＝-15.075±5％
f5＝-29.69±5％	n5＝1.81±5％	R51＝24.245±5％	R52＝Infinity
				f6＝23.26±5％	n6＝1.50±5％	R61＝15.862±5％	R62＝-38.867±5％
f7＝-9.44±5％	n4＝1.72±5％	R71＝-36.493±5％	R72＝8.481±5％
				f8＝12.80±5％	n4＝1.46±5％	R81＝8.481±5％	R82＝-15.610±5％
f9＝28.49±5％	n4＝1.59±5％	R91＝13.067±5％	R92＝45.721±5％

TABLE 1

When the focal length, refractive index and surface radius of the nine lenses of the utility model respectively satisfy the conditions of the above table 1, the MTF curve can be seen from fig. 4 and 5 under the limit conditions of normal temperature at 20 ℃, low temperature at minus 40 ℃, high temperature at minus 70 ℃ and the like without serious defocusing phenomenon.

The above description is only for the preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (5)

1. The large-aperture high-low-temperature confocal optical lens is characterized by comprising a first glass spherical lens L1 with convex-concave positive focal power, a second spherical lens L2 with convex-concave negative focal power, a third glass spherical lens L3 with double-concave negative focal power, a fourth glass spherical lens L4 with plano-convex positive focal power, a fifth spherical lens L5 with plano-convex positive focal power, a sixth spherical lens L6 with double-convex positive focal power, a third glass spherical lens L7 with double-concave negative focal power, a sixth spherical lens L8 with double-convex positive focal power and a sixth spherical lens L9 with double-concave positive focal power which are sequentially arranged in the light incidence direction.

2. The large-aperture high-low temperature confocal optical lens of claim 1, wherein: the focal length, the refractive index and the surface radius of the nine spherical lenses respectively meet the following conditions:

f₁＝-33.91±5％ n₁＝1.91±5％ R₁₁＝12.667±5％ R₁₂＝17.992±5％ f₂＝-15.11±5％ n₂＝1.60±5％ R₂₁＝43.321±5％ R₂₂＝7.534±5％ f₃＝-10.061±5％ n₃＝1.76±5％ R₃₁＝-9.960±5％ R₃₂＝35.767±5％ f₄＝16.97±5％ n₄＝1.88±5％ R₄₁＝Infinity R₄₂＝-15.075±5％ f₅＝-29.69±5％ n₅＝1.81±5％ R₅₁＝24.245±5％ R₅₂＝Infinity f₆＝23.26±5％ n₆＝1.50±5％ R₆₁＝15.862±5％ R₆₂＝-38.867±5％ f₇＝-9.44±5％ n₄＝1.72±5％ R₇₁＝-36.493±5％ R₇₂＝8.481±5％ f₈＝12.80±5％ n₄＝1.46±5％ R₈₁＝8.481±5％ R₈₂＝-15.610±5％ f₉＝28.49±5％ n₄＝1.59±5％ R₉₁＝13.067±5％ R₉₂＝45.721±5％

in the above table: f. of₁-f₉The focal lengths of the first glass spherical lens L1 and the ninth glass spherical lens 9 respectively correspond to the focal lengths in sequence; n is₁-n₉The refractive indexes of the first glass spherical lens L1 and the ninth glass spherical lens L9 respectively correspond in sequence; the R is₁₁And R₁₂Corresponding to the curvature radius of the first glass spherical lens L1, R₂₁And R₂₂Corresponding to the curvature radius of the third spherical glass lens L2, R₃₁And R₃₂Corresponding to the radius of curvature of the fourth spherical glass lens L4, R₅₁And R₅₂Corresponding to the curvature radius of the third spherical glass lens L5, R₆₁And R₆₂Corresponding to the radius of curvature of the fourth spherical glass lens L6, R₇₁And R₇₂Corresponding to the curvature radius of the third spherical glass lens L7, R₈₁And R₈₂Corresponding to the fourth glass sphere spherical lens L8, R₉₁And R₉₂Corresponds to the radius of curvature of the third aspherical lens L9, wherein "-" indicates that the direction is a negative direction.

3. A large-aperture high-low temperature confocal optical lens according to claim 1, wherein: the value of the aperture FNO of the optical lens meets the condition formula:

where f is the system focal length and D is the entrance pupil diameter.

4. The confocal optical lens with the large aperture and the high and low temperature as claimed in claim 1, wherein the FOV of the optical lens satisfies the conditional formula:

40°≤FOV≤60°。

5. the confocal optical lens with a large aperture and a high temperature as claimed in claim 1, wherein the total optical length TTL and the lens focal length EFL of the optical lens satisfy the following conditional formula:

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