CN211086772U

CN211086772U - Large-aperture large-target-surface long-focus high-low-temperature confocal optical device

Info

Publication number: CN211086772U
Application number: CN201922186579.6U
Authority: CN
Inventors: 王立忠; 姜月; 高屹东
Original assignee: PHENIX OPTICAL CO Ltd
Current assignee: PHENIX OPTICAL CO Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-07-24
Anticipated expiration: 2029-12-09

Abstract

The utility model discloses a big target surface of light ring burnt confocal optical device of high low temperature of length, this device includes the first glass spherical lens L1 of the convex-concave negative focal power that sets gradually along light incident direction, the second glass spherical lens L2 of biconcave negative focal power and the first cemented lens J1 that the third glass spherical lens L3 of biconvex positive focal power was glued and is formed, the fourth glass spherical lens L4 of biconvex positive focal power, the fifth plastic aspheric lens L5 of convex-concave negative focal power, the sixth glass spherical lens L6 of biconcave negative focal power and the second cemented lens J2 that the seventh glass spherical lens L7 of biconvex positive focal power was glued and is formed, the eighth glass spherical lens L8 of biconvex positive focal power, the ninth plastic aspheric lens L9 of biconvex negative focal power, this camera lens adopts 7G2P structure, the cost is reduced.

Description

Large-aperture large-target-surface long-focus high-low-temperature confocal optical device

Technical Field

The utility model discloses mainly to the security protection control and guarantee not the confocal optical device of high low temperature of big target face long focus of big light ring of out of focus at-40 ℃ -85 ℃.

Background

At present, the domestic closed circuit monitoring industry (CCTV) is developed towards miniaturization, multifunction and strong environment adaptability, and under the form of extremely intense domestic competition, the fixed focus lens cannot meet the requirements of customers in different regions, for example, the northeast market of China requires a designed monitoring device which is placed outdoors and is not defocused all the year round, the temperature of the northeast of China is often minus 30 ℃ in winter, and the highest temperature of the northeast of China can reach about 31 ℃ in summer. Considering the circuit heating factor of the monitoring camera, it becomes necessary to design an optical imaging device with a large aperture and a non-offset focal plane within-40 deg.C to 85 deg.C. Performing data statistics according to authority statistics of public security organs: nearly 70% of crimes occur at night or in dark regions, and darkness becomes a natural protective umbrella for criminals, and in view of color loss, unclear details and insufficient brightness under the infrared light supplement of the existing camera, the imaging quality of the current front-end camera under the weak light is difficult to find out to become a short plate for security and protection big data development, so that a large-aperture camera capable of realizing bright, clean and colorful pictures under low illumination is very necessary.

SUMMERY OF THE UTILITY MODEL

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

A7G 2P glass-plastic mixed structure high-low temperature confocal optical device with a focal length of 12mm comprises a first glass spherical lens L1 with convex-concave negative focal power, a second glass spherical lens L2 with double-concave negative focal power and a third glass spherical lens L3 with double-convex positive focal power, which are sequentially arranged along the light incidence direction, a first cemented lens J1 formed by cementing the first glass spherical lens L with convex-concave negative focal power, a fourth glass spherical lens L4 with double-convex positive focal power, a fifth plastic aspheric lens L5 with convex-concave negative focal power, a sixth glass spherical lens L6 with double-concave negative focal power and a seventh glass spherical lens L7 with double-convex positive focal power, a second cemented lens J2 with double-convex positive focal power, an eighth glass spherical lens L8 with double-concave negative focal power and a ninth plastic aspheric lens L9 with convex-concave negative focal power, wherein the focal lengths, the refractive indexes and the curvature radiuses of the seven glass spherical lenses of the optical device respectively meet the following conditions:

f₁＝-23.3±5％	n₁＝1.6±5％	R₁₁＝133±5％	R₁₂＝12±5％
				f₂＝-10.2±5％	n₂＝1.85±5％	R₂₁＝-13±5％	R₂₂＝29±5％
f₃＝15.9±5％	n₃＝1.74±5％	R₃₁＝29±5％	R₃₂＝-18±5％
				f₄＝24.8±5％	n₄＝1.52±5％	R₄₁＝32±5％	R₄₂＝-107±5％
f₅＝56.2±5％	n₅＝2.0±5％	R₅₁＝22±5％	R₅₂＝54±5％
				f₆＝-9.8±5％	n₆＝1.64±5％	R₆₁＝-22±5％	R₆₂＝14±5％
f₇＝14.3±5％	n₇＝1.85±5％	R₇₁＝14±5％	R₇₂＝-18±5％
				f₈＝17.3±5％	n₈＝1.59±5％	R₈₁＝13±5％	R₈₂＝-35±5％
f₉＝-38.4±5％	n₉＝1.57±5％	R₉₁＝43±5％	R₉₂＝16±5％

TABLE 1

In the above table: f. of₁-f₉Respectively correspond to the focal lengths of the first glass spherical lens L1 to the ninth plastic aspheric lens L9 in turn, wherein n is₁-n₉The refractive indexes of the first glass spherical lens L1 and the ninth plastic aspheric lens L9 are respectively and sequentially corresponding to R₁₁And R₁₂Corresponding to the radius of curvature, R, of the first glass spherical lens L1₂₁And R₂₂Corresponding to the radius of curvature of the second glass spherical lens L2, R₃₁And R₃₂Corresponding to the radius of curvature of the third spherical glass lens L3, R₄₁And R₄₂Corresponding to the radius of curvature, R, of the fourth spherical glass lens L4₅₁And R₅₂Corresponding to the radius of curvature of the fifth plastic aspheric lens L5, R₆₁And R₆₂Corresponding to the radius of curvature of the sixth glass spherical lens L6, R₇₁And R₇₂Corresponding to the radius of curvature of the seventh glass spherical lens L7, R₈₁And R₈₂Corresponding to the radius of curvature of the eighth spherical glass lens L8, R₉₁And R₉₂Corresponding to the radius of curvature of the ninth plastic aspheric lens L9, wherein "-" indicates that the direction is negative.

The aspheric equations of the plastic aspheric lenses L5, L9 satisfy:

in the above formula, the parameter c is a curvature radius, y is a radial coordinate, and k is a conic coefficient, wherein the fifth plastic aspheric lens L5 includes an R value₅₁Face and R₅₂The ninth plastic aspheric lens L9 includes opposite R₉₁Face and R₉₂The parameters of the face are as follows:

TABLE 2

The utility model discloses a focal power of 2 pieces of plastic aspheric surface lens of diaphragm image space and the sum of the focal power of three pieces of spherical lens are in following scope

Wherein f is₅，f₆，f₇，f₈，f₉See table 1.

The value of FNO of the utility model is in the following range

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

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 85 ℃.

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 a first glass spherical lens L1 with convex-concave negative focal power, a second glass spherical lens L2 with biconcave negative focal power, and a first cemented lens J1 cemented with a third glass spherical lens L3 with biconvex positive focal power, a fourth glass spherical lens L4 with biconvex positive focal power, a fifth plastic aspheric lens L5 with convex-concave negative focal power, a sixth glass spherical lens L6 with biconcave negative focal power, and a seventh glass spherical lens L with biconvex positive focal power, which are sequentially arranged along the light incident direction7, a second cemented lens J2 formed by cementing, an eighth glass spherical lens L8 with double convex positive focal power and a ninth plastic aspheric lens L9 with convex-concave negative 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 R₉₂In this case, numerals 1 to 7 respectively correspond to mirror surfaces of lenses L1 to L4, 8 denotes a STOP, 9 to 19 respectively correspond to mirror surfaces of lenses L5 to L10, and 20 denotes an image plane.

1. When the focal length, the refractive index and the curvature radius of the seven glass lenses of the nine lenses of the utility model respectively satisfy the following conditions:

TABLE 1

The aspheric equations of the plastic aspheric lenses L5, L9 satisfy:

TABLE 2

When the focal length, refractive index and curvature radius, thickness of nine pieces of glass lens of this utility model satisfy above-mentioned table 1 condition respectively, can see that the MTF curve does not all appear serious out of focus phenomenon under 20 degrees centigrade normal atmospheric temperature, 40 ℃ low temperature below zero, 85 ℃ high temperature above zero limit condition by figure 3, figure 4, figure 5.

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

1. The confocal optical device is characterized by comprising a first glass spherical lens L1 with convex-concave negative focal power, a second glass spherical lens L2 with double-concave negative focal power, a first cemented lens J1 formed by cementing a third glass spherical lens L3 with double-convex positive focal power, a fourth glass spherical lens L4 with double-convex positive focal power, a fifth plastic aspheric lens L5 with convex-concave negative focal power, a sixth glass spherical lens L6 with double-concave negative focal power, a second cemented lens J2 formed by cementing a seventh glass spherical lens L7 with double-convex positive focal power, an eighth glass spherical lens L8 with double-convex positive focal power and a ninth plastic aspheric lens L9 with convex-concave negative focal power, wherein the focal length, the refractive index and the curvature radius of the nine glass lenses of the optical device respectively meet the following conditions:

f₁＝-23_.3±5％ n₁＝1.6±5％ R₁₁＝133±5％ R₁₂＝12±5％ f₂＝-10.2±5％ n₂＝1.85±5％ R₂₁＝-13±5％ R₂₂＝29±5％ f₃＝15.9±5％ n₃＝1.74±5％ R₃₁＝29±5％ R₃₂＝-18±5％ f₄＝24.8±5％ n₄＝1.52±5％ R₄₁＝32±5％ R₄₂＝-127±5％ f₅＝56.2±5％ n₅＝2.0±5％ R₅₁＝22±5％ R₅₂＝54±5％ f₆＝-9.8±5％ n₆＝1.64±5％ R₆₁＝-22±5％ R₆₂＝14±5％ f₇＝14.3±5％ n₇＝1.85±5％ R₇₁＝14±5％ R₇₂＝-18±5％ f₈＝17.3±5％ n₈＝1.59±5％ R₈₁＝13±5％ R₈₂＝-36±5％ f₉＝-38.4±5％ n₉＝1.57±5％ R₉₁＝43±5％ R₉₂＝16±5％

2. The optical device as claimed in claim 1, wherein the aspheric equation of the fifth plastic aspheric lens L5 with convex-concave negative power and the aspheric equation of the ninth plastic aspheric lens L9 with convex-concave negative power satisfy:

3. the optical device of claim 1, further comprising a stop image side, wherein the sum of the focal power of the 2 plastic aspheric lenses and the focal power of the three spherical lenses is in the following range:

4. the confocal optical device with large aperture, large target surface, long focal length, high temperature and low temperature according to claim 1, wherein the value of FNO is in the following range

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