CN216901120U - Large-view-field image space telecentric conoscopic optical system for industrial chromaticity and brightness detection - Google Patents

Abstract

The utility model discloses a large-view-field image space telecentric cone-beam optical system for industrial chromaticity and brightness detection, which consists of a front group lens and a rear group lens, wherein a sixth spherical lens is arranged between the front group lens and the rear group lens, the front group lens comprises a first spherical lens, a second spherical lens, a third spherical lens, a fourth spherical lens and a fifth cemented spherical lens, and the rear group lens comprises a seventh spherical lens, an eighth spherical lens, a ninth spherical lens, a tenth spherical lens, an eleventh spherical lens, a twelfth cemented spherical lens, a thirteenth spherical lens, a fourteenth spherical lens and an image surface. The utility model has the beneficial effects that: the system can quickly and accurately acquire the visual angle performance measurement data of the display in real time, measure the chromaticity, brightness and contrast of the distribution of a plurality of angle light sources under a large visual angle, acquire the visual angle data of a complete cone through single measurement, quickly provide an accurate measurement result, and enable the system to become a choice for various research and development projects and on-line production quality control application.

Description

Large-view-field image space telecentric conoscopic optical system for industrial chromaticity and brightness detection

Technical Field

The utility model relates to the technical field of optical systems, in particular to a large-view-field image space telecentric conoscopic optical system for industrial chromaticity and brightness detection.

Background

With the development of science and technology, the industrial revolution is no longer stopped at the level of simple industrial development, the machine vision can replace the traditional manual detection method, the efficiency and the effect of industrial manufacturing are greatly improved, the product quality of the market is greatly improved, and the industrial lens is used as an important component of the machine vision and directly influences the overall performance of the system. The conventional method for detecting the brightness and the chromaticity of the flat panel display device on the market mainly adopts point-type vertical measurement or area array measurement, but the method can only measure the brightness of the specific angle, the actual display device has different light-emitting angles, and when the measurement angle changes, the measurement result of the brightness is greatly influenced, so that the chromaticity and the chromaticity uniformity are influenced, and the traditional industrial lens cannot meet the measurement of the brightness and the chromaticity of a plurality of angles.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a large-field image telecentric conoscopic optical system for industrial chromaticity and brightness detection, so as to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: a large-view-field image space telecentric cone-beam optical system for industrial chromaticity and brightness detection comprises a front group lens and a rear group lens, wherein a sixth spherical lens is arranged between the front group lens and the rear group lens, and the front group lens comprises a first spherical lens, a second spherical lens, a third spherical lens, a fourth spherical lens and a fifth cemented spherical lens; the primary image surface of the front group of lenses is arranged between the fifth cemented spherical lens and the sixth spherical lens; the rear group of lenses comprises a seventh spherical lens, an eighth spherical lens, a ninth spherical lens, a tenth spherical lens, an eleventh spherical lens, a twelfth cemented spherical lens, a thirteenth spherical lens, a fourteenth spherical lens and an image plane.

Preferably, each field of view chief ray is located between the fourteenth spherical lens and the image plane.

Preferably, the other end of the first spherical lens, which is far away from the second spherical lens, is an entrance pupil.

Preferably, one side of the sixth spherical lens close to the fifth cemented spherical lens is a primary image plane.

Preferably, the first spherical lens, the second spherical lens, the third spherical lens, the fourth spherical lens, the fifth cemented spherical lens, the seventh spherical lens, the eighth spherical lens, the eleventh spherical lens, the thirteenth spherical lens and the fourteenth spherical lens are all spherical lenses with positive focal power.

Preferably, the sixth spherical lens, the ninth spherical lens, the tenth spherical lens and the twelfth cemented spherical lens are spherical lenses with negative optical power.

Preferably, the entrance pupil is disposed at the foremost end of the front group of lenses, and is located at the object space focal plane position, so as to ensure that the chief ray incident on the image plane meets the requirement of an image space telecentric light path.

Preferably, the first spherical lens, the second spherical lens, the third spherical lens and the fourth spherical lens are curved entrance pupils for collecting light rays with large angles, and the fifth cemented spherical lens is an achromatic lens, which is beneficial to balancing axial and lateral chromatic aberration generated by the first spherical lens, the second spherical lens, the third spherical lens and the fourth spherical lens.

Preferably, the first spherical lens, the second spherical lens, the third spherical lens, the fourth spherical lens, the fifth cemented spherical lens, the seventh spherical lens, the eighth spherical lens, the ninth spherical lens, the tenth spherical lens, the eleventh spherical lens, the twelfth cemented spherical lens, the thirteenth spherical lens and the fourteenth spherical lens satisfy the following conditional expressions:

-100≤f1/f≤-1，-0.5≤d1/f≤-0.01 (1)

-20≤f2/f≤-1，-0.5≤d2/f≤-0.01 (2)

-20≤f3/f≤-1，-0.5≤d3/f≤-0.01 (3)

-50≤f4/f≤-1，-0.5≤d4/f≤-0.01 (4)

-100≤f5/f≤-1，-2≤d5/f≤-0.01 (5)

1≤f6/f≤50，-10≤d6/f≤-0.02 (6)

-20≤f7/f≤-1，-0.5≤d7/f≤-0.01 (7)

-20≤f8/f≤-1，-2≤d8/f≤-0.02 (8)

0.5≤f9/f≤10，-1≤d9/f≤-0.01 (9)

0.5≤f10/f≤20，-0.5≤d10/f≤-0.01 (10)

-10≤f11/f≤-1，-1≤d11/f≤-0.01 (11)

0.5≤f12/f≤20，-1≤d12/f≤-0.01 (12)

-20≤f13/f≤-1，-5≤d13/f≤-0.02 (13)

-20≤f14/f≤-1，-10≤d14/f≤-0.1 (14)，

wherein f is the focal length of the combined lens, f1 is the focal length of the first spherical lens, and d1 is the distance between the first spherical lens and the second spherical lens; f2 is the focal length of the second spherical lens, d2 is the distance between the second spherical lens and the third spherical lens; f3 is the focal length of the third spherical lens, d3 is the distance between the third spherical lens and the fourth spherical lens; f4 is the focal length of the fourth spherical lens, d4 is the distance between the fourth spherical lens and the fifth cemented spherical lens; f5 is the focal length of the fifth cemented spherical lens, d5 is the distance between the fifth cemented spherical lens and the sixth spherical lens; f6 is the focal length of the sixth spherical lens, d6 is the distance between the sixth spherical lens and the seventh spherical lens; f7 is the focal length of the seventh spherical lens, d7 is the distance between the seventh spherical lens and the eighth spherical lens; f8 is the focal length of the eighth spherical lens, d8 is the distance between the eighth spherical lens and the ninth spherical lens; f9 is the focal length of the ninth spherical lens, d9 is the distance between the ninth spherical lens and the tenth spherical lens; f1 is the focal length of the tenth spherical lens, d1 is the distance between the tenth spherical lens and the eleventh spherical lens; f11 is the focal length of the eleventh spherical lens, d11 is the distance between the eleventh spherical lens and the twelfth cemented spherical lens; f12 is the focal length of the twelfth cemented spherical lens, d12 is the distance between the twelfth cemented spherical lens and the thirteenth spherical lens; f13 is the focal length of the thirteenth spherical lens, d13 is the distance between the thirteenth spherical lens and the fourteenth spherical lens; f14 is the focal length of the fourteenth spherical lens, and d2 is the distance between the fourteenth spherical lens and the image plane.

Advantageous effects

The large-view-field image space telecentric conoscopic optical system for industrial chromaticity and brightness detection provided by the utility model can quickly and accurately acquire the viewing angle performance measurement data of a display in real time aiming at flat panel display manufacturers on the market, can measure the chromaticity, brightness and contrast of a plurality of angle light sources distributed under a large viewing angle, quickly provides an accurate measurement result by acquiring the viewing angle data of a complete cone through single measurement, and can become an ideal choice for various research and development projects and on-line production quality control application.

Drawings

FIG. 1 is a large field-of-view, image-space telecentric conoscopic objective optic path diagram of the present invention;

FIG. 2 is a schematic diagram of a conventional lens chromaticity and luminance measurement;

FIG. 3 is a schematic diagram of measuring chromaticity and brightness of a conoscope lens according to the present invention;

fig. 4(a) is a graph of MTF of the conoscopic lens at an object distance of infinity in example 1;

FIG. 4(b) is a graph of MTF of conoscopic lens at object distance of 750mm in example 1;

FIG. 4(c) is a graph of the MTF of the conoscopic lens of example 1 at an object distance of 500 mm;

FIG. 4(d) is a graph of the MTF of the conoscopic lens at an object distance of 250mm in example 1;

FIG. 5 is a distortion diagram of a conoscopic lens in example 1;

FIG. 6 is a telecentric view of the conoscope lens in example 1;

FIG. 7(a) graphs of MTF of conoscopic lens at an object distance of infinity in example 2;

FIG. 7(b) graph of MTF of conoscopic lens at object distance of 750mm in example 2;

FIG. 7(c) MTF graph of conoscopic lens at object distance of 500mm in example 2;

FIG. 7(d) graphs of MTF of conoscopic lens at an object distance of 250mm in example 2;

FIG. 8 is a distortion diagram of a conoscopic lens in example 2;

fig. 9 is a graph of the telecentricity of the conoscope lens in example 2;

FIG. 10(a) graphs of MTF of conoscopic lens at an object distance of infinity in example 3;

FIG. 10(b) graphs of MTF of conoscopic lens at object distance of 750mm in example 3;

FIG. 10(c) graphs of MTF of conoscopic lens at object distance of 500mm in example 3;

FIG. 10(d) graphs of MTF of conoscopic lens at an object distance of 250mm in example 3;

fig. 11 is a distortion diagram of the conoscope lens in embodiment 3;

fig. 12 is a conoscopic lens telecentricity diagram in example 3.

Reference numerals

1-first spherical lens, 2-second spherical lens, 3-third spherical lens, 4-fourth spherical lens, 5-fifth cemented spherical lens, 6-sixth spherical lens, 7-seventh spherical lens, 8-eighth spherical lens, 9-ninth spherical lens, 10-tenth spherical lens, 11-eleventh spherical lens, 12-twelfth cemented spherical lens, 13-thirteenth spherical lens, 14-fourteenth spherical lens, 15-entrance pupil, 16-primary image plane, 17-each field of view chief ray, 18-image plane.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example 1

The utility model is further described with reference to the following figures and examples:

a conoscopic optical system telecentric with a large-field image space for industrial chroma and brightness detection is disclosed in FIG. 1: the spherical lens comprises a front group lens and a rear group lens, wherein a sixth spherical lens 6 is arranged between the front group lens and the rear group lens, and the front group lens comprises a first spherical lens 1, a second spherical lens 2, a third spherical lens 3, a fourth spherical lens 4 and a fifth cemented spherical lens 5; the primary image surface 16 of the front group of lenses is arranged between the fifth cemented spherical lens and the sixth spherical lens; the rear group of lenses comprises a seventh spherical lens 7, an eighth spherical lens 8, a ninth spherical lens 9, a tenth spherical lens 10, an eleventh spherical lens 11, a twelfth cemented spherical lens 12, a thirteenth spherical lens 13, a fourteenth spherical lens 14 and an image plane 18; an entrance pupil 15 serving as a diaphragm of the cone light optical system is placed at the foremost end of the front group of lenses and is located at the position of an object focal plane.

The preferable scheme of the scheme is as follows: the first spherical lens 1, the second spherical lens 2, the third spherical lens 3 and the fourth spherical lens 4 in the front group of lenses are all positive lenses and are bent to the entrance pupil, light with an angle of 0-140 degrees is collected into the front group of lenses, the front group of lenses converge light rays with different visual fields at a primary image surface 16, and glass with the refractive index larger than 1.6 is selected, so that the aperture size of the front group is favorably reduced, and the field curvature aberration generated by a part of large angles is favorably eliminated; the fifth cemented spherical lens 5 is beneficial to eliminating the axial chromatic aberration and the magnification chromatic aberration generated by the front group; the sixth spherical lens is used as the whole field lens for eliminating the field curvature aberration of the front group part; the rear group has the function of ensuring that the emergent light path of the cone light optical system is a telecentric light path and balancing the field curvature aberration generated by the front group; the seventh spherical lens 7 and the eighth spherical lens 7 are used for eliminating the following problems related to the field of view: coma, astigmatism, field curvature; the ninth spherical lens 9 and the tenth spherical lens 10 are negative lenses and are used for balancing spherical aberration, astigmatism and field curvature of the whole group of cone beam optical system; the twelfth cemented spherical lens 12 is for: balancing spherical aberration, axial chromatic aberration and magnification chromatic aberration; the thirteenth spherical lens 13 and the fourteenth spherical lens 14 are used for eliminating spherical aberration and astigmatism, and changing the direction of the chief ray 17 of each field of view, which is helpful for realizing an image space telecentric optical path.

The cone optical system has reasonable focal power distribution, can effectively inhibit aberration, and designs the telecentric cone optical objective with a large field of view and an image space. The FOV is the imaging field of view and the CRA is telecentricity (parallelism of the chief ray to the optical axis).

FOV is more than or equal to 120 degrees and less than or equal to 140 degrees.

CRA is less than or equal to 0.05 degree.

The diaphragm of the traditional lens is generally positioned in the lens as shown in fig. 2, when the object to be detected has the field diaphragm, the edge field is easily blocked, so that the large field direction imaging cannot be obtained; fig. 3 illustrates the imaging principle of the conoscopic optical system, in which the lens is designed to simulate the size, position and field of view of human eyes, and unlike other lenses in which the aperture is located inside the lens, since the aperture is located in front of the lens, the connected imaging system can acquire the complete field of view (FOV) of the display without being blocked by lens hardware.

The diameter D of the entrance pupil of the lens is 3.6mm, the field of view is 120 degrees, the focusing is realized by moving the relative distance between the front group and the rear group, and the focusing range is 250mm to infinity. The design parameters of the optical system are shown in table 1, the focusing distances of the front group and the rear group of different object distances are shown in table 2, MTF curves of different object distances in a full field are respectively shown in fig. 4(a), fig. 4(b), fig. 4(c) and fig. 4(d), the MTF values are all more than or equal to 0.3 at 100lp/mm, and the optical system has high resolution; distortion is shown in fig. 5, which is less than 35% and within acceptable ranges; the telecentricity of the conoscopic lens is shown in fig. 6, and the telecentricity CRA is less than or equal to 0.05.

The 3.6mm entrance pupil matches the size of the human eye entrance pupil, which enables the measurement system to measure the display under the same conditions as when viewed by the observer.

TABLE 1 design parameters of 120-degree conoscopic optical system in field of view

TABLE 2 focusing distances of front and rear groups of different object distances of 120-degree cone light optical system

Object distance (0stop)	Thickness (14 sides)
		Infinity	49.710946
1000	50.118181
		500	50.523156
250	51.336590

Example 2:

the diameter D of the entrance pupil of the lens is 3.6mm, the field of view is 130 degrees, the focusing is realized by moving the relative distance between the front group and the rear group, and the focusing range is 250mm to infinity. The design parameters of the optical system are shown in table 3, the focusing distances of the front group and the rear group with different object distances are shown in table 4, the MTF curves of different object distances in the full field are respectively shown in fig. 7(a), 7(b), 7(c) and 7(d), the MTF values are all more than or equal to 0.3 at 100lp/mm, and the optical system has high resolution; distortion is shown in fig. 8, which is less than 43% and is within the acceptable range; the telecentricity of the conoscopic lens is shown in fig. 9, and the telecentricity CRA is less than or equal to 0.05.

TABLE 3 field of view 130 degree conoscopic optical system design parameters

TABLE 4 focusing distances of front and rear groups of 130-degree field conoscopic optical system with different object distances

Object distance (0stop)	Thickness (14 sides)
		Infinity	50.200981
1000	50.53356
		500	50.86634
250	51.53286

Example 3:

the diameter D of the entrance pupil of the lens is 3.6mm, the field of view is 140 degrees, the focusing is realized by moving the relative distance between the front group and the rear group, and the focusing range is 250mm to infinity. The design parameters of the optical system are shown in table 5, the focusing distances of front and rear groups with different object distances are shown in table 6, the MTF curves of different object distances in a full field are respectively shown in fig. 10(a), fig. 10(b), fig. 10(c) and fig. 10(d), the MTF values are all more than or equal to 0.15 at 100lp/mm, and the optical system has high resolution; distortion is shown in fig. 11, which is less than 50%, within an acceptable range; the telecentricity of the conoscopic lens is shown in fig. 12, and the telecentricity CRA is less than or equal to 0.05.

TABLE 5 design parameters of 140 ° field conoscopic optical system

TABLE 6 focusing distances of front and rear groups of 140-degree field conoscopic optical systems with different object distances

Object distance (0stop)	Thickness (14 sides)
		Infinity	50.183452
1000	50.460141
		500	50.734773
250	51.288693

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the contents of the present invention within the scope of the protection of the present invention.

Claims (9)

1. A large-view-field image space telecentric cone-beam optical system for industrial chromaticity and brightness detection comprises a front group lens and a rear group lens, wherein a sixth spherical lens is arranged between the front group lens and the rear group lens, and the front group lens comprises a first spherical lens, a second spherical lens, a third spherical lens, a fourth spherical lens and a fifth cemented spherical lens; the primary image surface of the front group of lenses is arranged between the fifth cemented spherical lens and the sixth spherical lens; the rear group of lenses comprises a seventh spherical lens, an eighth spherical lens, a ninth spherical lens, a tenth spherical lens, an eleventh spherical lens, a twelfth cemented spherical lens, a thirteenth spherical lens, a fourteenth spherical lens and an image plane.

2. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: and chief rays of each field of view are arranged between the fourteenth spherical lens and the image plane.

3. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: the other end of the first spherical lens, which is far away from the second spherical lens, is an entrance pupil.

4. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: and one side of the sixth spherical lens, which is close to the fifth cemented spherical lens, is a primary image surface.

5. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: the first spherical lens, the second spherical lens, the third spherical lens, the fourth spherical lens, the fifth cemented spherical lens, the seventh spherical lens, the eighth spherical lens, the eleventh spherical lens, the thirteenth spherical lens and the fourteenth spherical lens are all spherical lenses with positive focal power.

6. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: the sixth spherical lens, the ninth spherical lens, the tenth spherical lens and the twelfth cemented spherical lens are spherical lenses with negative focal power.

7. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: and the entrance pupil is arranged at the foremost end of the front group of lenses and is positioned at the position of an object space focal plane and used for ensuring that the principal ray incident to the image plane meets the requirements of an image space telecentric light path.

8. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: the first spherical lens, the second spherical lens, the third spherical lens and the fourth spherical lens are bent to the entrance pupil and used for collecting light rays with large angles, and the fifth cemented spherical lens is an achromatic lens and is beneficial to balancing axial and transverse chromatic aberration generated by the first spherical lens, the second spherical lens, the third spherical lens and the fourth spherical lens.

9. The industrial chroma brightness detection telecentric conoscopic optical system with a large-field image space according to claim 1, wherein: the first spherical lens, the second spherical lens, the third spherical lens, the fourth spherical lens, the fifth cemented spherical lens, the seventh spherical lens, the eighth spherical lens, the ninth spherical lens, the tenth spherical lens, the eleventh spherical lens, the twelfth cemented spherical lens, the thirteenth spherical lens and the fourteenth spherical lens satisfy the following conditional expressions:

-100≤f1/f≤-1，-0.5≤d1/f≤-0.01 （1）

-20≤f2/f≤-1 ，-0.5≤d2/f≤-0.01 （2）

-20≤f3/f≤-1，-0.5≤d3/f≤-0.01 （3）

-50≤f4/f≤-1 ，-0.5≤d4/f≤-0.01 （4）

-100≤f5/f≤-1 ，-2≤d5/f≤-0.01 （5）

1≤f6/f≤50，-10≤d6/f≤-0.02 （6）

-20≤f7/f≤-1，-0.5≤d7/f≤-0.01 （7）

-20≤f8/f≤-1，-2≤d8/f≤-0.02 （8）

0.5≤f9/f≤10，-1≤d9/f≤-0.01 （9）

0.5≤f10/f≤20，-0.5≤d10/f≤-0.01 （10）

-10≤f11/f≤-1，-1≤d11/f≤-0.01 （11）

0.5≤f12/f≤20，-1≤d12/f≤-0.01 （12）

-20≤f13/f≤-1，-5≤d13/f≤-0.02 （13）

-20≤f14/f≤-1，-10≤d14/f≤-0.1 （14），

wherein f is the focal length of the combined lens, f1 is the focal length of the first spherical lens, and d1 is the distance between the first spherical lens and the second spherical lens; f2 is the focal length of the second spherical lens, d2 is the distance between the second spherical lens and the third spherical lens; f3 is the focal length of the third spherical lens, d3 is the distance between the third spherical lens and the fourth spherical lens; f4 is the focal length of the fourth spherical lens, d4 is the distance between the fourth spherical lens and the fifth cemented spherical lens; f5 is the fifth cemented spherical lens focal length, d5 is the fifth cemented spherical lens to sixth spherical lens separation; f6 is the focal length of the sixth spherical lens, d6 is the distance between the sixth spherical lens and the seventh spherical lens; f7 is the focal length of the seventh spherical lens, d7 is the distance between the seventh spherical lens and the eighth spherical lens; f8 is the focal length of the eighth spherical lens, d8 is the distance between the eighth spherical lens and the ninth spherical lens; f9 is the focal length of the ninth spherical lens, and d9 is the distance between the ninth spherical lens and the tenth spherical lens; f10 is the focal length of the tenth spherical lens, d10 is the distance between the tenth spherical lens and the eleventh spherical lens; f11 is the focal length of the eleventh spherical lens, d11 is the distance between the eleventh spherical lens and the twelfth cemented spherical lens; f12 is the focal length of the twelfth cemented spherical lens, d12 is the distance between the twelfth cemented spherical lens and the thirteenth spherical lens; f13 is the focal length of the thirteenth spherical lens, d13 is the distance between the thirteenth spherical lens and the fourteenth spherical lens; f14 is the focal length of the fourteenth spherical lens, and d2 is the distance between the fourteenth spherical lens and the image plane.

Images