CN111338078B - A Few Pixel Optical Imaging System - Google Patents

Abstract

The invention discloses an optical imaging system with few pixels, comprising: a first microlens array, a second microlens array, a third microlens array and an aberration calibration lens group; The light of the field of view, the light of the third field of view, the light of the fourth field of view and the light of the fifth field of view pass through the first microlens array, the second microlens array, the third microlens array and the aberration calibration lens in sequence. After grouping, the first aberration correction light, the second aberration correction light, the third aberration correction light, the fourth aberration correction light and the fifth aberration correction light are obtained, the first aberration correction light, the second aberration correction light The light, the third aberration-corrected light, the fourth aberration-corrected light, and the fifth aberration-corrected light form a quadratic rectangular image plane. The invention gathers the light of the long-line primary image plane to form a rectangular secondary image plane, and only needs a common area array detector to complete the photoelectric conversion, so that a large field of view imaging system can be realized.

Description

A Few Pixel Optical Imaging System

technical field

The invention belongs to the technical field of optical imaging systems, and in particular relates to an optical imaging system with few pixels.

Background technique

With the continuous enrichment of application fields, the current demand for large-field optical systems continues to increase, which not only increases the difficulty of designing the optical system itself, but also increases the demand for detectors with large area arrays or long linear arrays, especially The imaging system using the push-broom mode requires an ultra-long linear array of detectors. Although this problem can be solved by developing detectors with more pixels or using detector splicing technology, the development and splicing of detectors usually require the joint completion of many professionals. For the whole system, it will increase huge manpower and material cost. Therefore, it is necessary to solve this problem by changing the design of the optical system, such as reducing the focal length of the system, and the size of the phase surface can be reduced under the same field of view, but the resolution of the system will also decrease, which may not meet the application.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, an optical imaging system with few pixels is provided, in which a secondary image plane rearrangement optical system is added after the original primary image plane, and the long linear primary image plane is added to the rearrangement optical system. The light beams are gathered again to form a rectangular secondary image plane. At this time, only the commonly used area array detector can complete the photoelectric conversion, so that the large field of view imaging system can be realized.

The object of the present invention is achieved through the following technical solutions: an optical imaging system with few pixels, comprising: a first microlens array, a second microlens array, a third microlens array and an aberration calibration lens group; The primary image plane is divided into the light of the first field of view, the light of the second field of view, the light of the third field of view, the light of the fourth field of view and the light of the fifth field of view; the light of the first field of view, the light of the second field of view The light of the field of view, the light of the third field of view, the light of the fourth field of view and the light of the fifth field of view pass through the first microlens array, the second microlens array, the third microlens array and the aberration calibration lens in sequence respectively. After grouping, the first aberration correction light, the second aberration correction light, the third aberration correction light, the fourth aberration correction light and the fifth aberration correction light are obtained, the first aberration correction light, the second aberration correction light The light, the third aberration-corrected light, the fourth aberration-corrected light, and the fifth aberration-corrected light form a quadratic rectangular image plane; wherein, the primary image plane is a long line array.

In the above-mentioned few-pixel optical imaging system, the first microlens array includes a first microlens (1-1), a fourth microlens (1-2), a seventh microlens (1-3), and a tenth microlens ( 1-4) and the thirteenth microlens (1-5); the second microlens array includes a second microlens (2-1), a fifth microlens (2-2), an eighth microlens (2-3) ), an eleventh microlens (2-4) and a fourteenth microlens (2-5); the third microlens array includes a third microlens (3-1), a sixth microlens (3-2), The ninth microlens (3-3), the twelfth microlens (3-4) and the fifteenth microlens (3-5); the aberration calibration lens group includes a first lens (4), a second lens (5), a third lens (6) and a fourth lens (7); the light in the first field of view passes through the first microlens (1-1), the second microlens (2-1) and the third microlens in sequence (3-1), and then pass through the first lens (4), the second lens (5), the third lens (6) and the fourth lens (7) in sequence to obtain the first aberration-corrected light; the light of the second field of view Pass through the fourth microlens (1-2), the fifth microlens (2-2) and the sixth microlens (3-2) in sequence, and then pass through the first lens (4), the second lens (5), the The third lens (6) and the fourth lens (7) obtain the second aberration-corrected light; the light in the third field of view passes through the seventh microlens (1-3), the eighth microlens (2-3), the ninth The tiny lens (3-3) is then passed through the first lens (4), the second lens (5), the third lens (6) and the fourth lens (7) in sequence to obtain a third aberration-corrected light; the fourth field of view The light rays pass through the tenth microlens (1-4), the eleventh microlens (2-4), the twelfth microlens (3-4), and then the first lens (4), the second lens ( 5), the third lens (6) and the fourth lens (7) obtain the fourth aberration correction light; the light of the fifth field of view passes through the thirteenth microlens (1-5) and the fourteenth microlens (2) in turn -5) and the fifteenth tiny lens (3-5), and then pass through the first lens (4), the second lens (5), the third lens (6) and the fourth lens (7) in order to obtain the fifth aberration Correction light; the first aberration correction light, the second aberration correction light, the third aberration correction light, the fourth aberration correction light and the fifth aberration correction light form a quadratic rectangular image surface.

In the above-mentioned few-pixel optical imaging system, the distance between the primary image plane and the left mirror surface of the first micro lens (1-1) is 10mm, and the curvature radius of the left mirror surface of the first micro lens (1-1) is -27.4mm, The curvature radius of the right mirror surface of the first micro lens (1-1) is -30.9mm, the thickness of the first micro lens (1-1) is 10mm, and the right mirror surface of the first micro lens (1-1) and the second micro lens The distance between the left mirror surface of the lens (2-1) is 19.8mm, the light-passing aperture of the left mirror surface of the first microlens (1-1) is 8.8mm, and the light-passing aperture of the right mirror surface of the first microlens (1-1) The aperture is 11.6mm; the curvature radius of the left mirror surface of the fourth microlens (1-2) is -27.6mm, the curvature radius of the right mirror surface of the fourth microlens (1-2) is -30.9mm, and the fourth microlens ( 1-2) The thickness is 10mm, the distance between the right mirror surface of the fourth microlens (1-2) and the left mirror surface of the fifth microlens (2-2) is 19.8mm, and the The clear aperture of the left mirror surface is 8.5mm, the clear aperture of the right mirror surface of the fourth micro lens (1-2) is 11.1mm; the curvature radius of the left mirror surface of the seventh micro lens (1-3) is -27.6mm, The curvature radius of the right mirror surface of the seventh microlens (1-3) is -30.9mm, the thickness of the seventh microlens (1-3) is 10mm, and the right mirror surface of the seventh microlens (1-3) is the same as the eighth microlens. The pitch of the left mirror surface of the lens (2-3) is 19.8mm, the aperture of the left mirror surface of the seventh microlens (1-3) is 8.2mm, and the light transmission diameter of the right mirror surface of the seventh microlens (1-3) The aperture is 10.7mm; the curvature radius of the left mirror surface of the tenth microlens (1-4) is -27.6mm, the curvature radius of the right mirror surface of the tenth microlens (1-4) is -30.9mm, and the tenth microlens ( 1-4) The thickness is 10mm, the distance between the right mirror surface of the tenth microlens (1-4) and the left mirror surface of the eleventh microlens (2-4) is 19.8mm, and the tenth microlens (1-4) The clear aperture of the left mirror surface is 8.5mm, the clear aperture of the right mirror surface of the tenth micro lens (1-4) is 11.1mm; the curvature radius of the left mirror surface of the thirteenth micro lens (1-5) is -27.6 mm, the curvature radius of the right mirror surface of the thirteenth microlens (1-5) is -30.9mm, the thickness of the thirteenth microlens (1-5) is 10mm, and the right mirror of the thirteenth microlens (1-5) The distance between the mirror surface and the left mirror surface of the fourteenth microlens (2-5) is 19.8mm, the clear aperture of the left mirror surface of the thirteenth microlens (1-5) is 8.8mm, and the thirteenth microlens (1- 5) The clear aperture of the right mirror surface is 11.6mm.

In the above-mentioned few-pixel optical imaging system, the curvature radius of the left mirror surface of the second micro lens (2-1) is -299.1 mm, the curvature radius of the right mirror surface of the second micro lens (2-1) is 153.9 mm, and the second micro lens (2-1) has a curvature radius of 153.9 mm. The thickness of the microlens (2-1) is 10mm, the distance between the right mirror surface of the second microlens (2-1) and the left mirror surface of the third microlens (3-1) is 4.4mm, and the second microlens (2- The clear aperture of the left mirror surface of 1) is 13.4mm, the clear aperture of the right mirror surface of the second micro lens (2-1) is 14.1mm; the curvature radius of the left mirror surface of the fifth micro lens (2-2) is - 299.1mm, the curvature radius of the right mirror surface of the fifth microlens (2-2) is 153.9mm, the thickness of the fifth microlens (2-2) is 10mm, and the right mirror surface of the fifth microlens (2-2) is the same as the The spacing between the left mirror surfaces of the six microlenses (3-2) is 4.4mm, the aperture of the left mirror surface of the fifth microlens (2-2) is 12.4mm, and the right mirror surface of the fifth microlens (2-2) The clear aperture is 14.9mm; the curvature radius of the left mirror surface of the eighth microlens (2-3) is -299.1mm, the curvature radius of the right mirror surface of the eighth microlens (2-3) is 153.9mm, and the eighth microlens The thickness of (2-3) is 10mm, the distance between the right mirror surface of the eighth microlens (2-3) and the left mirror surface of the ninth microlens (3-3) is 4.4mm, and the eighth microlens (2-3) The clear aperture of the left mirror surface is 11.4mm, the clear aperture of the right mirror surface of the eighth micro lens (2-3) is 11.8mm; the curvature radius of the left mirror surface of the eleventh micro lens (2-4) is -299.1 mm, the radius of curvature of the right mirror surface of the eleventh microlens (2-4) is 153.9mm, the thickness of the eleventh microlens (2-4) is 10mm, and the right mirror surface of the eleventh microlens (2-4) The distance from the left mirror surface of the twelfth microlens (3-4) is 4.4mm, the clear aperture of the left mirror surface of the eleventh microlens (2-4) is 12.4mm, and the eleventh microlens (2-4) ) of the right mirror surface has a clear aperture of 12.9mm; the curvature radius of the left mirror surface of the fourteenth microlens (2-5) is -299.1mm, and the curvature radius of the right mirror of the fourteenth microlens (2-5) is 153.9mm, the thickness of the fourteenth microlens (2-5) is 10mm, and the distance between the right mirror surface of the fourteenth microlens (2-5) and the left mirror surface of the fifteenth microlens (3-5) is 4.4mm , the clear aperture of the left mirror surface of the fourteenth micro lens (2-5) is 12.4mm, and the clear aperture of the right mirror surface of the fourteenth micro lens (2-5) is 12.9mm.

In the above-mentioned few-pixel optical imaging system, the curvature radius of the left mirror surface of the third microlens (3-1) is 653.6mm, the curvature radius of the right mirror surface of the third microlens (3-1) is -71.9mm, and the third microlens (3-1) has a curvature radius of -71.9mm. The thickness of the micro lens (3-1) is 9.99 mm, the distance between the right mirror surface of the third micro lens (3-1) and the left mirror surface of the first lens (4) is 40 mm, and the The clear aperture of the left mirror surface is 16.3mm, the clear aperture of the right mirror surface of the third micro lens (3-1) is 17.3mm; the curvature radius of the left mirror surface of the sixth micro lens (3-2) is 653.6mm, the first The radius of curvature of the right mirror surface of the six microlens (3-2) is -71.9mm, the thickness of the sixth microlens (3-2) is 9.99mm, and the right mirror surface of the sixth microlens (3-2) is connected to the first lens The pitch of the left mirror surface of (4) is 40mm, the clear aperture of the left mirror surface of the sixth microlens (3-2) is 14.9mm, and the clear aperture of the right mirror surface of the sixth microlens (3-2) is 15.8mm ; The curvature radius of the left mirror surface of the ninth microlens (3-3) is 653.6mm, the curvature radius of the right mirror surface of the ninth microlens (3-3) is -71.9mm, and the The thickness is 9.99mm, the distance between the right mirror surface of the ninth microlens (3-3) and the left mirror surface of the first lens (4) is 40mm, and the clear aperture of the left mirror surface of the ninth microlens (3-3) is 13.5 mm, the clear aperture of the right mirror surface of the ninth microlens (3-3) is 14.3mm; the curvature radius of the left mirror surface of the twelfth microlens (3-4) is 653.6mm, and the twelfth microlens (3- 4) The radius of curvature of the right mirror surface is -71.9mm, the thickness of the twelfth microlens (3-4) is 9.99mm, and the The spacing of the left mirror surface is 40mm, the clear aperture of the left mirror surface of the twelfth micro lens (3-4) is 14.9mm, and the clear aperture of the right mirror surface of the twelfth micro lens (3-4) is 15.8mm; The curvature radius of the left mirror surface of the fifteenth microlens (3-5) is 653.6mm, the curvature radius of the right mirror surface of the fifteenth microlens (3-5) is -71.9mm, and the fifteenth microlens (3-5) The thickness is 9.99mm, the distance between the right mirror surface of the fifteenth micro lens (3-5) and the left mirror surface of the first lens (4) is 40mm, and the light passing through the left mirror surface of the fifteenth micro lens (3-5) The aperture is 16.3mm, and the clear aperture of the right mirror surface of the fifteenth micro lens (3-5) is 17.3mm.

In the above-mentioned few-pixel optical imaging system, the curvature radius of the left mirror surface of the first lens (4) is 70.3 mm, the curvature radius of the right mirror surface of the first lens (4) is 146.8 mm, and the thickness of the first lens (4) is 9.99mm, the distance between the right mirror surface of the first lens (4) and the left mirror surface of the second lens (5) is 15.2mm, the clear aperture of the left mirror surface of the first lens (4) is 40mm, and the first lens (4) The clear aperture of the right mirror is 40mm.

In the above-mentioned few-pixel optical imaging system, the curvature radius of the left mirror surface of the second lens (5) is -106.6 mm, the curvature radius of the right mirror surface of the second lens (5) is -112 mm, and the thickness of the second lens (5) is 8.2mm, the distance between the right mirror surface of the second lens (5) and the left mirror surface of the third lens (6) is 0.7mm, the clear aperture of the left mirror surface of the second lens (5) is 40mm, and the second lens (5) ), the clear aperture of the right mirror surface is 40mm.

In the above-mentioned few-pixel optical imaging system, the radius of curvature of the left mirror surface of the third lens (6) is -93.7 mm, the radius of curvature of the right mirror surface of the third lens (6) is -132.1 mm, and the radius of curvature of the third lens (6) is -132.1 mm. The thickness is 7.2mm, the distance between the right mirror surface of the third lens (6) and the left mirror surface of the fourth lens (7) is 29mm, and the clear aperture of the left mirror surface of the third lens (6) is 35mm, and the third lens (6) ), the clear aperture of the right mirror surface is 35mm.

In the above-mentioned few-pixel optical imaging system, the curvature radius of the left mirror surface of the fourth lens (7) is 25.1 mm, the curvature radius of the right mirror surface of the fourth lens (7) is 23.1 mm, and the thickness of the fourth lens (7) is 10.2mm, the distance between the right mirror surface of the fourth lens (7) and the secondary rectangular image surface is 4.2mm, the clear aperture of the left mirror surface of the fourth lens (7) is 20mm, and the diameter of the right mirror surface of the fourth lens (7) is 20mm. The clear aperture is 20mm.

Compared with the prior art, the present invention has the following beneficial effects:

(1) In the present invention, the required detectors of the large-field optical system are changed from long linear array detectors to conventional area array detectors, which greatly reduces the requirements for detectors, and the types of detectors that can be selected are more abundant. It also reduces the cost of custom detectors.

(2) Due to the abundance of optional detector types and the introduction of the secondary image plane rearrangement optical system, there is a greater degree of freedom for the design of the traditional optical system in front of the primary image. Other metrics such as aberrations can be further optimized. At the same time, because the design of the optical system is more flexible, the entire optical system with a large field of view can be applied to more fields.

(3) The present invention can further reduce the aberration of the system by using the optical system after the primary image plane, and improve the imaging quality. Especially since the newly added secondary image plane rearrangement group is designed separately for each small part of the primary image plane, the aberration of each part can be reduced as much as possible, which is equivalent to dividing the large field of view into many continuous of small fields of view and optimized for the aberrations of each small field of view. Finally, the overall aberration is balanced by the common lens group. Therefore, the resulting aberrations are better than those of traditional large-field optical systems.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 is a schematic diagram of a few-pixel optical imaging system provided by an embodiment of the present invention;

2 is a schematic diagram of an optical path of a secondary image plane rearrangement optical system unit provided by an embodiment of the present invention;

3 is another optical path schematic diagram of a secondary image plane rearrangement optical system unit provided by an embodiment of the present invention;

4 is another optical path schematic diagram of a secondary image plane rearrangement optical system unit provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of a conventional optical system plus a few-pixel optical imaging system provided by an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

1 is a schematic diagram of a few-pixel optical imaging system provided by an embodiment of the present invention; FIG. 2 is a schematic diagram of an optical path of a secondary image plane rearrangement optical system unit provided by an embodiment of the present invention; FIG. 3 is provided by an embodiment of the present invention. Another schematic diagram of the optical path of the secondary image plane rearrangement optical system unit; FIG. 4 is another schematic diagram of the optical path of the secondary image plane rearrangement optical system unit provided by the embodiment of the present invention.

As shown in FIGS. 1 to 4 , the few-pixel optical imaging system includes a first microlens array, a second microlens array, a third microlens array and an aberration calibration lens group; wherein,

After passing through the image plane once, the incident light is divided into the light of the first field of view, the light of the second field of view, the light of the third field of view, the light of the fourth field of view and the light of the fifth field of view;

The light of the first field of view, the light of the second field of view, the light of the third field of view, the light of the fourth field of view and the light of the fifth field of view pass through the first microlens array, the second microlens array, the The first aberration correction light, the second aberration correction light, the third aberration correction light, the fourth aberration correction light and the fifth aberration correction light are obtained after the three micro lens arrays and the aberration correction lens group. The aberration correction light, the second aberration correction light, the third aberration correction light, the fourth aberration correction light and the fifth aberration correction light form a quadratic rectangular image plane; wherein, the primary image plane is a long line array.

The first microlens array includes a first microlens 1-1, a fourth microlens 1-2, a seventh microlens 1-3, a tenth microlens 1-4 and a thirteenth microlens 1-5;

The second microlens array includes a second microlens 2-1, a fifth microlens 2-2, an eighth microlens 2-3, an eleventh microlens 2-4 and a fourteenth microlens 2-5;

The third microlens array includes a third microlens 3-1, a sixth microlens 3-2, a ninth microlens 3-3, a twelfth microlens 3-4 and a fifteenth microlens 3-5;

The aberration calibration lens group includes a first lens 4, a second lens 5, a third lens 6 and a fourth lens 7;

The light rays of the first field of view pass through the first microlens 1-1, the second microlens 2-1 and the third microlens 3-1 in sequence, and then pass through the first lens 4, the second lens 5, the third lens 6 and the The fourth lens 7 obtains the first aberration correction light;

The light rays of the second field of view pass through the fourth microlens 1-2, the fifth microlens 2-2 and the sixth microlens 3-2 in sequence, and then pass through the first lens 4, the second lens 5, the third lens 6 and the The fourth lens 7 obtains the second aberration correction light;

The light in the third field of view passes through the seventh microlens 1-3, the eighth microlens 2-3, and the ninth microlens 3-3 in sequence, and then passes through the first lens 4, the second lens 5, the third lens 6 and the The fourth lens 7 obtains the third aberration correction light;

The light in the fourth field of view passes through the tenth microlens 1-4, the eleventh microlens 2-4, and the twelfth microlens 3-4 in sequence, and then passes through the first lens 4, the second lens 5, and the third lens in sequence 6 and the fourth lens 7 obtain the fourth aberration correction light;

The light of the fifth field of view passes through the thirteenth microlens 1-5, the fourteenth microlens 2-5 and the fifteenth microlens 3-5 in sequence, and then passes through the first lens 4, the second lens 5, the third lens Lens 6 and fourth lens 7 obtain fifth aberration correction light;

The first aberration correction light, the second aberration correction light, the third aberration correction light, the fourth aberration correction light and the fifth aberration correction light form a quadratic rectangular image plane.

The distance between the primary image plane and the left mirror surface of the first micro lens 1-1 is 10mm, the curvature radius of the left mirror surface of the first micro lens 1-1 is -27.4mm, and the curvature radius of the right mirror surface of the first micro lens 1-1 is -30.9mm, the thickness of the first microlens 1-1 is 10mm, the distance between the right mirror surface of the first microlens 1-1 and the left mirror surface of the second microlens 2-1 is 19.8mm, and the first microlens 1- The clear aperture of the left mirror surface of 1 is 8.8mm, and the clear aperture of the right mirror surface of the first micro lens 1-1 is 11.6mm;

The curvature radius of the left mirror surface of the fourth microlens 1-2 is -27.6mm, the curvature radius of the right mirror surface of the fourth microlens 1-2 is -30.9mm, the thickness of the fourth microlens 1-2 is 10mm, and the fourth microlens 1-2 has a thickness of 10mm. The distance between the right mirror surface of the micro lens 1-2 and the left mirror surface of the fifth micro lens 2-2 is 19.8mm, the aperture of the left mirror surface of the fourth micro lens 1-2 is 8.5mm, and the fourth micro lens 1-2 The clear aperture of the right mirror is 11.1mm;

The curvature radius of the left mirror surface of the seventh microlens 1-3 is -27.6mm, the curvature radius of the right mirror surface of the seventh microlens 1-3 is -30.9mm, the thickness of the seventh microlens 1-3 is 10mm, and the seventh microlens 1-3 has a thickness of 10mm. The distance between the right mirror surface of the microlens 1-3 and the left mirror surface of the eighth microlens 2-3 is 19.8mm, and the aperture diameter of the left mirror surface of the seventh microlens 1-3 is 8.2mm, and the seventh microlens 1-3 The clear aperture of the right mirror is 10.7mm;

The curvature radius of the left mirror surface of the tenth microlens 1-4 is -27.6mm, the curvature radius of the right mirror surface of the tenth microlens 1-4 is -30.9mm, the thickness of the tenth microlens 1-4 is 10mm, and the tenth microlens 1-4 has a thickness of 10mm. The distance between the right mirror surface of the micro-lens 1-4 and the left mirror surface of the eleventh micro-lens 2-4 is 19.8mm, and the clear aperture of the left mirror surface of the tenth micro-lens 1-4 is 8.5mm, and the tenth micro-lens 1- The clear aperture of the right mirror of 4 is 11.1mm;

The curvature radius of the left mirror surface of the thirteenth microlens 1-5 is -27.6mm, the curvature radius of the right mirror surface of the thirteenth microlens 1-5 is -30.9mm, and the thickness of the thirteenth microlens 1-5 is 10mm , the distance between the right mirror surface of the thirteenth microlens 1-5 and the left mirror surface of the fourteenth microlens 2-5 is 19.8mm, and the clear aperture of the left mirror surface of the thirteenth microlens 1-5 is 8.8mm. The clear aperture of the right mirror surface of the thirteen micro lenses 1-5 is 11.6mm;

The curvature radius of the left mirror surface of the second micro lens 2-1 is -299.1 mm, the curvature radius of the right mirror surface of the second micro lens 2-1 is 153.9 mm, the thickness of the second micro lens 2-1 is 10 mm, and the second micro lens 2-1 has a thickness of 10 mm. The distance between the right mirror surface of the lens 2-1 and the left mirror surface of the third micro lens 3-1 is 4.4 mm, the clear aperture of the left mirror surface of the second micro lens 2-1 is 13.4 mm, and the The clear aperture of the right mirror is 14.1mm;

The curvature radius of the left mirror surface of the fifth micro lens 2-2 is -299.1 mm, the curvature radius of the right mirror surface of the fifth micro lens 2-2 is 153.9 mm, the thickness of the fifth micro lens 2-2 is 10 mm, and the fifth micro lens 2-2 has a thickness of 10 mm. The distance between the right mirror surface of the lens 2-2 and the left mirror surface of the sixth microlens 3-2 is 4.4mm, the clear aperture of the left mirror surface of the fifth microlens 2-2 is 12.4mm, and the The clear aperture of the right mirror is 14.9mm;

The curvature radius of the left mirror surface of the eighth microlens 2-3 is -299.1mm, the curvature radius of the right mirror surface of the eighth microlens 2-3 is 153.9mm, the thickness of the eighth microlens 2-3 is 10mm, and the eighth microlens 2-3 has a thickness of 10mm. The distance between the right mirror surface of the lens 2-3 and the left mirror surface of the ninth micro lens 3-3 is 4.4 mm, the clear aperture of the left mirror surface of the eighth micro lens 2-3 is 11.4 mm, and the The clear aperture of the right mirror is 11.8mm;

The curvature radius of the left mirror surface of the eleventh microlens 2-4 is -299.1mm, the curvature radius of the right mirror surface of the eleventh microlens 2-4 is 153.9mm, the thickness of the eleventh microlens 2-4 is 10mm, The distance between the right mirror surface of the eleventh microlens 2-4 and the left mirror surface of the twelfth microlens 3-4 is 4.4 mm, and the clear aperture of the left mirror surface of the eleventh microlens 2-4 is 12.4 mm. The clear aperture of the right mirror surface of a tiny lens 2-4 is 12.9mm;

The curvature radius of the left mirror surface of the fourteenth microlens 2-5 is -299.1mm, the curvature radius of the right mirror surface of the fourteenth microlens 2-5 is 153.9mm, the thickness of the fourteenth microlens 2-5 is 10mm, The distance between the right mirror surface of the fourteenth microlens 2-5 and the left mirror surface of the fifteenth microlens 3-5 is 4.4 mm, and the clear aperture of the left mirror of the fourteenth microlens 2-5 is 12.4 mm. The clear aperture of the right mirror of the four micro lenses 2-5 is 12.9mm;

The curvature radius of the left mirror surface of the third micro lens 3-1 is 653.6 mm, the curvature radius of the right mirror surface of the third micro lens 3-1 is -71.9 mm, the thickness of the third micro lens 3-1 is 9.99 mm, and the third micro lens 3-1 has a thickness of 9.99 mm. The distance between the right mirror surface of the microlens 3-1 and the left mirror surface of the first lens 4 is 40 mm, the clear aperture of the left mirror surface of the third microlens 3-1 is 16.3 mm, and the diameter of the right mirror surface of the third microlens 3-1 The clear aperture is 17.3mm;

The curvature radius of the left mirror surface of the sixth microlens 3-2 is 653.6mm, the curvature radius of the right mirror surface of the sixth microlens 3-2 is -71.9mm, the thickness of the sixth microlens 3-2 is 9.99mm, and the sixth microlens 3-2 has a thickness of 9.99mm. The distance between the right mirror surface of the micro lens 3-2 and the left mirror surface of the first lens 4 is 40mm, the aperture of the left mirror surface of the sixth micro lens 3-2 is 14.9mm, and the right mirror surface of the sixth micro lens 3-2 is 14.9mm. The clear aperture is 15.8mm;

The curvature radius of the left mirror surface of the ninth microlens 3-3 is 653.6mm, the curvature radius of the right mirror surface of the ninth microlens 3-3 is -71.9mm, the thickness of the ninth microlens 3-3 is 9.99mm, and the ninth microlens 3-3 has a thickness of 9.99mm. The distance between the right mirror surface of the microlens 3-3 and the left mirror surface of the first lens 4 is 40mm, the aperture of the left mirror surface of the ninth microlens 3-3 is 13.5mm, and the diameter of the right mirror surface of the ninth microlens 3-3 is 13.5mm. The clear aperture is 14.3mm;

The curvature radius of the left mirror surface of the twelfth microlens 3-4 is 653.6 mm, the curvature radius of the right mirror surface of the twelfth microlens 3-4 is -71.9mm, and the thickness of the twelfth microlens 3-4 is 9.99mm , the distance between the right mirror surface of the twelfth microlens 3-4 and the left mirror surface of the first lens 4 is 40mm, the clear aperture of the left mirror surface of the twelfth microlens 3-4 is 14.9mm, and the twelfth microlens 3 The clear aperture of the right mirror of -4 is 15.8mm;

The curvature radius of the left mirror surface of the fifteenth micro lens 3-5 is 653.6 mm, the curvature radius of the right mirror surface of the fifteenth micro lens 3-5 is -71.9 mm, and the thickness of the fifteenth micro lens 3-5 is 9.99 mm , the distance between the right mirror surface of the fifteenth microlens 3-5 and the left mirror surface of the first lens 4 is 40mm, the aperture of the left mirror of the fifteenth microlens 3-5 is 16.3mm, and the fifteenth microlens 3 The clear aperture of the right mirror of -5 is 17.3mm;

The curvature radius of the left mirror surface of the first lens 4 is 70.3mm, the curvature radius of the right mirror surface of the first lens 4 is 146.8mm, the thickness of the first lens 4 is 9.99mm, the right mirror surface of the first lens 4 and the second lens 5 The spacing of the left mirror surface is 15.2mm, the clear aperture of the left mirror surface of the first lens 4 is 40mm, and the clear aperture of the right mirror surface of the first lens 4 is 40mm;

The curvature radius of the left mirror surface of the second lens 5 is -106.6mm, the curvature radius of the right mirror surface of the second lens 5 is -112mm, the thickness of the second lens 5 is 8.2mm, the right mirror surface of the second lens 5 and the third lens The spacing of the left mirror surface of 6 is 0.7mm, the clear aperture of the left mirror surface of the second lens 5 is 40mm, and the clear aperture of the right mirror surface of the second lens 5 is 40mm;

The curvature radius of the left mirror surface of the third lens 6 is -93.7mm, the curvature radius of the right mirror surface of the third lens 6 is -132.1mm, the thickness of the third lens 6 is 7.2mm, and the right mirror surface of the third lens 6 and the fourth The spacing of the left mirror surface of the lens 7 is 29mm, the clear aperture of the left mirror surface of the third lens 6 is 35mm, and the clear aperture of the right mirror surface of the third lens 6 is 35mm;

The curvature radius of the left mirror surface of the fourth lens 7 is 25.1mm, the curvature radius of the right mirror surface of the fourth lens 7 is 23.1mm, the thickness of the fourth lens 7 is 10.2mm, and the right mirror surface of the fourth lens 7 is a quadratic rectangular image. The distance between the surfaces is 4.2 mm, the clear aperture of the left mirror surface of the fourth lens 7 is 20 mm, and the clear aperture of the right mirror surface of the fourth lens 7 is 20 mm.

Working principle: The primary image plane is a long line array. According to the different imaging positions of different fields of view, the primary image plane is divided into five parts, each part contains the light corresponding to the field of view, and the light passes through the corresponding micro lens group and aberration calibration lens. After the grouping, a quadratic rectangular image plane is formed, thereby reducing the requirements of the optical system for the detector, which is helpful for the design of an optical system with a larger field of view.

The light propagates in a straight line during the propagation of each lens, and follows the law of refraction when entering different media: n ₁ sinθ ₁ =n ₂ sinθ ₂ , the parameters of each optical element are shown in the following table:

FIG. 5 is a schematic diagram of a conventional optical system plus a few-pixel optical imaging system provided by an embodiment of the present invention. As shown in Figure 5, the secondary image plane rearrangement optical system is placed between the traditional optical system and the detector; after the light passes through the traditional optical system, the light converges to form a primary image, and each part of the primary image plane corresponds to a group of secondary image plane rearrangements group, this part of the light is gathered again to form a secondary image plane; the detector module receives the light at the secondary image plane for photoelectric conversion to obtain the final image.

The traditional optical system is a classic optical system often used in engineering, such as an off-axis three-mirror system. For these traditional optical systems, when the required field of view continues to increase, the area of the primary image plane also continues to increase, gradually forming a long linear shape. At this time, a linear array detector with a large number of pixels needs to be customized to complete the photoelectric conversion. It increases the difficulty and cost of developing the whole system.

The secondary image plane rearrangement optical system is designed separately for each part of the primary image plane, converging the light behind the primary image plane separately, and finally reducing the aberration of each part through the common lens group to form a secondary image plane. Compared with the long linear shape of the primary image surface, the secondary image surface becomes a rectangular image surface. At this time, only a conventional area array detector is needed to complete the photoelectric conversion.

As shown in Figure 5, the primary image plane formed by the light passing through the traditional optical system is long and linear. The long linear image plane is divided into several small parts, and the secondary image plane rearrangement group is designed separately for each part, as shown in the figure As shown in Figure 2 to Figure 4, the secondary image plane rearrangement groups of each part are arranged consecutively, and the light rays corresponding to the primary image plane are converged, and finally converge to form a secondary image plane after passing through the common lens group. It can be seen that compared with the long-line shape of the primary image surface, the rectangular secondary image surface is easier to achieve photoelectric conversion.

The invention changes the required detector of the large field of view optical system from a long linear array detector to a conventional area array detector, which greatly reduces the requirements for the detector, and has more kinds of optional detectors. It also reduces the cost of custom detectors.

Due to the abundance of optional detector types and the introduction of the secondary image plane rearrangement optical system, there is a greater degree of freedom in the design of the traditional optical system in front of the primary image. Other indicators such as difference are further optimized. At the same time, because the design of the optical system is more flexible, the entire optical system with a large field of view can be applied to more fields.

The invention can further reduce the aberration of the system by using the optical system after the primary image plane, and improve the imaging quality. Especially since the newly added secondary image plane rearrangement group is designed separately for each small part of the primary image plane, the aberration of each part can be reduced as much as possible, which is equivalent to dividing the large field of view into many continuous of small fields of view and optimized for the aberrations of each small field of view. Finally, the overall aberration is balanced by the common lens group. Therefore, the resulting aberrations are better than those of traditional large-field optical systems.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can use the methods and technical contents disclosed above to improve the present invention without departing from the spirit and scope of the present invention. The technical solutions are subject to possible changes and modifications. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention belong to the technical solutions of the present invention. protected range.

Claims (7)

1. A few-pixel optical imaging system, comprising: the optical lens comprises a first micro lens array, a second micro lens array, a third micro lens array and an aberration calibration lens group; wherein,

the incident light passes through the primary image surface and is divided into light of a first view field, light of a second view field, light of a third view field, light of a fourth view field and light of a fifth view field;

the light rays of the first field, the light rays of the second field, the light rays of the third field, the light rays of the fourth field and the light rays of the fifth field sequentially pass through the first micro lens array, the second micro lens array, the third micro lens array and the aberration calibration lens group respectively to obtain first aberration correction light rays, second aberration correction light rays, third aberration correction light rays, fourth aberration correction light rays and fifth aberration correction light rays, and the first aberration correction light rays, the second aberration correction light rays, the third aberration correction light rays, the fourth aberration correction light rays and the fifth aberration correction light rays form a secondary rectangular image surface; wherein, the primary image surface is in a long linear array type;

the first micro lens array comprises a first micro lens (1-1), a fourth micro lens (1-2), a seventh micro lens (1-3), a tenth micro lens (1-4) and a thirteenth micro lens (1-5);

the second micro lens array comprises a second micro lens (2-1), a fifth micro lens (2-2), an eighth micro lens (2-3), an eleventh micro lens (2-4) and a fourteenth micro lens (2-5);

the third micro lens array comprises a third micro lens (3-1), a sixth micro lens (3-2), a ninth micro lens (3-3), a twelfth micro lens (3-4) and a fifteenth micro lens (3-5);

the aberration calibration lens group comprises a first lens (4), a second lens (5), a third lens (6) and a fourth lens (7);

the light of the first field of view sequentially passes through a first micro lens (1-1), a second micro lens (2-1) and a third micro lens (3-1), and then sequentially passes through a first lens (4), a second lens (5), a third lens (6) and a fourth lens (7) to obtain first aberration correction light;

the light of the second field of view sequentially passes through a fourth micro lens (1-2), a fifth micro lens (2-2) and a sixth micro lens (3-2), and then sequentially passes through a first lens (4), a second lens (5), a third lens (6) and a fourth lens (7) to obtain second aberration correction light;

the light of the third field of view sequentially passes through a seventh tiny lens (1-3), an eighth tiny lens (2-3) and a ninth tiny lens (3-3), and then sequentially passes through a first lens (4), a second lens (5), a third lens (6) and a fourth lens (7) to obtain third aberration correction light;

the light of the fourth field of view sequentially passes through tenth micro lenses (1-4), eleventh micro lenses (2-4) and twelfth micro lenses (3-4), and then sequentially passes through the first lens (4), the second lens (5), the third lens (6) and the fourth lens (7) to obtain fourth aberration correction light;

the light of the fifth field of view sequentially passes through a thirteenth micro lens (1-5), a fourteenth micro lens (2-5) and a fifteenth micro lens (3-5), and then sequentially passes through a first lens (4), a second lens (5), a third lens (6) and a fourth lens (7) to obtain a fifth aberration correction light;

the first aberration correction light ray, the second aberration correction light ray, the third aberration correction light ray, the fourth aberration correction light ray and the fifth aberration correction light ray form a secondary rectangular image surface;

the distance between the primary image surface and the left mirror surface of the first micro lens (1-1) is 10mm, the curvature radius of the left mirror surface of the first micro lens (1-1) is-27.4 mm, the curvature radius of the right mirror surface of the first micro lens (1-1) is-30.9 mm, the thickness of the first micro lens (1-1) is 10mm, the distance between the right mirror surface of the first micro lens (1-1) and the left mirror surface of the second micro lens (2-1) is 19.8mm, the clear aperture of the left mirror surface of the first micro lens (1-1) is 8.8mm, and the clear aperture of the right mirror surface of the first micro lens (1-1) is 11.6 mm;

the curvature radius of the left mirror surface of the fourth micro lens (1-2) is-27.6 mm, the curvature radius of the right mirror surface of the fourth micro lens (1-2) is-30.9 mm, the thickness of the fourth micro lens (1-2) is 10mm, the distance between the right mirror surface of the fourth micro lens (1-2) and the left mirror surface of the fifth micro lens (2-2) is 19.8mm, the clear aperture of the left mirror surface of the fourth micro lens (1-2) is 8.5mm, and the clear aperture of the right mirror surface of the fourth micro lens (1-2) is 11.1 mm;

the curvature radius of the left mirror surface of the seventh micro lens (1-3) is-27.6 mm, the curvature radius of the right mirror surface of the seventh micro lens (1-3) is-30.9 mm, the thickness of the seventh micro lens (1-3) is 10mm, the distance between the right mirror surface of the seventh micro lens (1-3) and the left mirror surface of the eighth micro lens (2-3) is 19.8mm, the clear aperture of the left mirror surface of the seventh micro lens (1-3) is 8.2mm, and the clear aperture of the right mirror surface of the seventh micro lens (1-3) is 10.7 mm;

the curvature radius of the left mirror surface of the tenth micro lens (1-4) is-27.6 mm, the curvature radius of the right mirror surface of the tenth micro lens (1-4) is-30.9 mm, the thickness of the tenth micro lens (1-4) is 10mm, the distance between the right mirror surface of the tenth micro lens (1-4) and the left mirror surface of the eleventh micro lens (2-4) is 19.8mm, the clear aperture of the left mirror surface of the tenth micro lens (1-4) is 8.5mm, and the clear aperture of the right mirror surface of the tenth micro lens (1-4) is 11.1 mm;

the curvature radius of the left mirror surface of the thirteenth micro lens (1-5) is-27.6 mm, the curvature radius of the right mirror surface of the thirteenth micro lens (1-5) is-30.9 mm, the thickness of the thirteenth micro lens (1-5) is 10mm, the distance between the right mirror surface of the thirteenth micro lens (1-5) and the left mirror surface of the fourteenth micro lens (2-5) is 19.8mm, the clear aperture of the left mirror surface of the thirteenth micro lens (1-5) is 8.8mm, and the clear aperture of the right mirror surface of the thirteenth micro lens (1-5) is 11.6 mm.

2. The few-pixel optical imaging system of claim 1, wherein: the curvature radius of the left mirror surface of the second micro lens (2-1) is-299.1 mm, the curvature radius of the right mirror surface of the second micro lens (2-1) is 153.9mm, the thickness of the second micro lens (2-1) is 10mm, the distance between the right mirror surface of the second micro lens (2-1) and the left mirror surface of the third micro lens (3-1) is 4.4mm, the clear aperture of the left mirror surface of the second micro lens (2-1) is 13.4mm, and the clear aperture of the right mirror surface of the second micro lens (2-1) is 14.1 mm;

the curvature radius of the left mirror surface of the fifth micro lens (2-2) is-299.1 mm, the curvature radius of the right mirror surface of the fifth micro lens (2-2) is 153.9mm, the thickness of the fifth micro lens (2-2) is 10mm, the distance between the right mirror surface of the fifth micro lens (2-2) and the left mirror surface of the sixth micro lens (3-2) is 4.4mm, the clear aperture of the left mirror surface of the fifth micro lens (2-2) is 12.4mm, and the clear aperture of the right mirror surface of the fifth micro lens (2-2) is 14.9 mm;

the curvature radius of the left mirror surface of the eighth micro lens (2-3) is-299.1 mm, the curvature radius of the right mirror surface of the eighth micro lens (2-3) is 153.9mm, the thickness of the eighth micro lens (2-3) is 10mm, the distance between the right mirror surface of the eighth micro lens (2-3) and the left mirror surface of the ninth micro lens (3-3) is 4.4mm, the clear aperture of the left mirror surface of the eighth micro lens (2-3) is 11.4mm, and the clear aperture of the right mirror surface of the eighth micro lens (2-3) is 11.8 mm;

the curvature radius of the left mirror surface of the eleventh micro lens (2-4) is-299.1 mm, the curvature radius of the right mirror surface of the eleventh micro lens (2-4) is 153.9mm, the thickness of the eleventh micro lens (2-4) is 10mm, the distance between the right mirror surface of the eleventh micro lens (2-4) and the left mirror surface of the twelfth micro lens (3-4) is 4.4mm, the clear aperture of the left mirror surface of the eleventh micro lens (2-4) is 12.4mm, and the clear aperture of the right mirror surface of the eleventh micro lens (2-4) is 12.9 mm;

the curvature radius of the left mirror surface of the fourteenth micro lens (2-5) is-299.1 mm, the curvature radius of the right mirror surface of the fourteenth micro lens (2-5) is 153.9mm, the thickness of the fourteenth micro lens (2-5) is 10mm, the distance between the right mirror surface of the fourteenth micro lens (2-5) and the left mirror surface of the fifteenth micro lens (3-5) is 4.4mm, the clear aperture of the left mirror surface of the fourteenth micro lens (2-5) is 12.4mm, and the clear aperture of the right mirror surface of the fourteenth micro lens (2-5) is 12.9 mm.

3. The few-pixel optical imaging system of claim 1, wherein: the curvature radius of the left mirror surface of the third micro lens (3-1) is 653.6mm, the curvature radius of the right mirror surface of the third micro lens (3-1) is-71.9 mm, the thickness of the third micro lens (3-1) is 9.99mm, the distance between the right mirror surface of the third micro lens (3-1) and the left mirror surface of the first lens (4) is 40mm, the clear aperture of the left mirror surface of the third micro lens (3-1) is 16.3mm, and the clear aperture of the right mirror surface of the third micro lens (3-1) is 17.3 mm;

the curvature radius of the left mirror surface of the sixth micro lens (3-2) is 653.6mm, the curvature radius of the right mirror surface of the sixth micro lens (3-2) is-71.9 mm, the thickness of the sixth micro lens (3-2) is 9.99mm, the distance between the right mirror surface of the sixth micro lens (3-2) and the left mirror surface of the first lens (4) is 40mm, the clear aperture of the left mirror surface of the sixth micro lens (3-2) is 14.9mm, and the clear aperture of the right mirror surface of the sixth micro lens (3-2) is 15.8 mm;

the curvature radius of the left mirror surface of the ninth micro lens (3-3) is 653.6mm, the curvature radius of the right mirror surface of the ninth micro lens (3-3) is-71.9 mm, the thickness of the ninth micro lens (3-3) is 9.99mm, the distance between the right mirror surface of the ninth micro lens (3-3) and the left mirror surface of the first lens (4) is 40mm, the clear aperture of the left mirror surface of the ninth micro lens (3-3) is 13.5mm, and the clear aperture of the right mirror surface of the ninth micro lens (3-3) is 14.3 mm;

the curvature radius of the left mirror surface of the twelfth micro lens (3-4) is 653.6mm, the curvature radius of the right mirror surface of the twelfth micro lens (3-4) is-71.9 mm, the thickness of the twelfth micro lens (3-4) is 9.99mm, the distance between the right mirror surface of the twelfth micro lens (3-4) and the left mirror surface of the first lens (4) is 40mm, the clear aperture of the left mirror surface of the twelfth micro lens (3-4) is 14.9mm, and the clear aperture of the right mirror surface of the twelfth micro lens (3-4) is 15.8 mm;

the curvature radius of the left mirror surface of the fifteenth micro lens (3-5) is 653.6mm, the curvature radius of the right mirror surface of the fifteenth micro lens (3-5) is-71.9 mm, the thickness of the fifteenth micro lens (3-5) is 9.99mm, the distance between the right mirror surface of the fifteenth micro lens (3-5) and the left mirror surface of the first lens (4) is 40mm, the clear aperture of the left mirror surface of the fifteenth micro lens (3-5) is 16.3mm, and the clear aperture of the right mirror surface of the fifteenth micro lens (3-5) is 17.3 mm.

4. The few-pixel optical imaging system of claim 1, wherein: the curvature radius of the left mirror surface of the first lens (4) is 70.3mm, the curvature radius of the right mirror surface of the first lens (4) is 146.8mm, the thickness of the first lens (4) is 9.99mm, the distance between the right mirror surface of the first lens (4) and the left mirror surface of the second lens (5) is 15.2mm, the clear aperture of the left mirror surface of the first lens (4) is 40mm, and the clear aperture of the right mirror surface of the first lens (4) is 40 mm.

5. The few-pixel optical imaging system of claim 1, wherein: the curvature radius of the left mirror surface of the second lens (5) is-106.6 mm, the curvature radius of the right mirror surface of the second lens (5) is-112 mm, the thickness of the second lens (5) is 8.2mm, the distance between the right mirror surface of the second lens (5) and the left mirror surface of the third lens (6) is 0.7mm, the clear aperture of the left mirror surface of the second lens (5) is 40mm, and the clear aperture of the right mirror surface of the second lens (5) is 40 mm.

6. The few-pixel optical imaging system of claim 1, wherein: the curvature radius of the left mirror surface of the third lens (6) is-93.7 mm, the curvature radius of the right mirror surface of the third lens (6) is-132.1 mm, the thickness of the third lens (6) is 7.2mm, the distance between the right mirror surface of the third lens (6) and the left mirror surface of the fourth lens (7) is 29mm, the clear aperture of the left mirror surface of the third lens (6) is 35mm, and the clear aperture of the right mirror surface of the third lens (6) is 35 mm.

7. The few-pixel optical imaging system of claim 1, wherein: the curvature radius of the left mirror surface of the fourth lens (7) is 25.1mm, the curvature radius of the right mirror surface of the fourth lens (7) is 23.1mm, the thickness of the fourth lens (7) is 10.2mm, the distance between the right mirror surface of the fourth lens (7) and the secondary rectangular image surface is 4.2mm, the clear aperture of the left mirror surface of the fourth lens (7) is 20mm, and the clear aperture of the right mirror surface of the fourth lens (7) is 20 mm.

Images