Back-end array splicing structure of a multi-channel large field of view and high-resolution imaging system

Abstract

A back-end array splicing structure of a multi-channel large field of view high-resolution imaging system relates to the field of optical imaging technology. To solve the mechanical interference problem of short-wave infrared detectors in existing short-wave infrared band imaging systems, it includes a primary imaging lens group, multiple coordinate discontinuous elements, multiple secondary imaging lens groups, and multiple detectors; the secondary imaging lens groups are evenly arranged. When the number of secondary imaging lens groups is odd, the central secondary imaging lens group is located at the center of the array and directly corresponds to the detector; the remaining secondary imaging lens groups are arranged in an array around the central secondary imaging lens group, and the back-end array optical path is dispersed through the inserted coordinate discontinuous elements and finally reaches multiple detectors; the present invention proposes a spatial arrangement method of the coordinate discontinuous elements to solve the mechanical interference problem between multiple back-end array secondary imaging lens groups or between multiple array detectors, and provides a solution for the layout of multiple large-size array detectors of a multi-channel large field of view high-resolution imaging system.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and particularly to a rear-end array splicing imaging optical system of an array splicing optical imaging system. Background Art

[0002] A multi-channel large field of view and high-resolution imaging system is mainly composed of a front group primary imaging system, a rear group secondary imaging system, and multiple detectors, and is mainly divided into two types: array splicing of the front group imaging system and array splicing of the rear group secondary imaging system.

[0003] In the Chinese patent publication number "CN 108205194 A" with the patent name "A Visible Light and Infrared Composite System Based on a Spherical Concentric Primary Mirror", the overlapping area of the long-wave camera field of view is 10%, and the overlapping area is small. When the overlapping field of view area is small, mechanical collision can be avoided. However, when the system requires the use of a large-size short-wave infrared camera and a large overlapping field of view area is required, how to solve the mechanical collision problem will become a difficult point. Especially for a short-wave infrared band imaging system, due to the limitations of existing technologies, the mechanical size of a short-wave infrared detector is much larger than that of a conventional detector. Taking the outer shell size of a short-wave infrared detector as 55mm×55mm×78mm as an example, the mechanical interference problem of the short-wave infrared detector is particularly prominent. Summary of the Invention

[0004] In order to solve the mechanical interference problem of the short-wave infrared detector in the existing short-wave infrared band imaging system, the present invention provides a rear-end array splicing structure of a multi-channel large field of view and high-resolution imaging system.

[0005] The technical solution for the present invention to solve the technical problem is as follows:

[0006] A rear-end array splicing structure of a multi-channel large field of view and high-resolution imaging system, the structure including a primary imaging lens group, multiple coordinate discontinuity elements, multiple secondary imaging lens groups, and multiple detectors;

[0007] When the number of the secondary imaging lens groups is odd or even, they are evenly arranged. When the number of the secondary imaging lens groups is odd, the central secondary imaging lens group is located at the center of the array and directly corresponds to the detector; the remaining secondary imaging lens groups are arranged around the central secondary imaging lens group in an array, and the rear-end array optical path is dispersed through the inserted coordinate discontinuity elements and finally reaches multiple detectors; when the number of the secondary imaging lens groups is even, each secondary imaging lens group is dispersed by the inserted coordinate discontinuity elements to the rear-end array optical path and finally reaches the detector;

[0008] When the coordinate discontinuity element is located between the primary imaging lens group and multiple secondary imaging lens groups, each coordinate discontinuity element causes the secondary imaging lens group and the detector in the corresponding channel to deflect synchronously. In this case, the secondary imaging lens group and the detector are on the same axis. When the coordinate discontinuity element is located between multiple secondary imaging lens groups and the detector, each coordinate discontinuity element causes the detector in the corresponding channel to deflect. In this case, the secondary imaging lens group and the detector are no longer on the same axis.

[0009] The object is first imaged by the primary imaging lens group and then secondarily imaged by the secondary imaging lens group. The coordinate discontinuity element is selectively inserted between the primary imaging lens group and the secondary imaging lens group or between the secondary imaging lens group and the detector, thereby dispersing the rear-end array branches and avoiding mechanical collisions. The final image is received by multiple detectors respectively.

[0010] Advantages of the present invention:

[0011] The present invention proposes a spatial arrangement method of the coordinate discontinuity element, which solves the mechanical interference problem between multiple rear-end array secondary imaging lens groups or between multiple array detectors while ensuring field of view overlap, and provides a solution for the layout of multiple large-size array detectors in a multi-channel large field of view high-resolution imaging system.

[0012] The present invention proposes a technical solution to avoid mechanical interference between adjacent rear-end array secondary imaging lens groups or between adjacent array detectors, and solves the problem of mechanical interference between multiple detectors in a common array system caused by the too large size of short-wave infrared detectors. Description of the Drawings

[0013] Figure 1 Schematic structural diagram of a multi-channel large field of view high-resolution imaging system according to an embodiment of the present invention, with a structural arrangement form of 1×3 and the coordinate discontinuity element located between the primary imaging lens group and the secondary imaging lens group;

[0014] Figure 2 Schematic structural diagram of a multi-channel large field of view high-resolution imaging system according to an embodiment of the present invention, with a structural arrangement form of 1×3 and the coordinate discontinuity element located between the secondary imaging lens group and the detector;

[0015] Figure 3 Schematic structural diagram of a multi-channel large field of view high-resolution imaging system according to an embodiment of the present invention, with a structural arrangement form of 3×3 and the coordinate discontinuity element located between the secondary imaging lens group and the detector. Detailed Embodiments

[0016] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0017] The rear - end array splicing structure of a multi - channel large - field - of - view high - resolution imaging system, which structure includes a primary imaging lens group 1, a plurality of coordinate discontinuous elements 2, a plurality of secondary imaging lens groups 3 and a plurality of detectors 4;

[0018] When the number of secondary imaging lens groups 3 is odd or even, they are evenly arranged. When the number of secondary imaging lens groups 3 is odd, a single secondary imaging lens group 3 is located at the center of the array and directly corresponds to the detector 4; the remaining secondary imaging lens groups 3 have their optical paths changed by the inserted coordinate discontinuous elements 2, and the optical paths are deflected to the detector 4 and dispersed to the surrounding. When the number of secondary imaging lens groups 3 is even, each secondary imaging lens group 3 has its optical path changed by the inserted coordinate discontinuous elements 2, and the optical paths are deflected to the detector 4 and dispersed to the surrounding.

[0019] When the coordinate discontinuous element 2 is located between the primary imaging lens group 1 and the plurality of secondary imaging lens groups 3, the coordinate discontinuous element 2 deflects both the secondary imaging lens group 3 and the detector 4, and the secondary imaging lens group 3 and the detector 4 are on the same axis; when the coordinate discontinuous element 2 is located between the plurality of secondary imaging lens groups 3 and the detector 4, the coordinate discontinuous element 2 deflects the detector 4, and the secondary imaging lens group 3 and the detector 4 are no longer on the same axis.

[0020] The object is imaged once by the primary imaging lens group 1, then the rear - end array branches are dispersed by the coordinate discontinuous element 2 to avoid mechanical collision, and then imaged twice by the secondary imaging lens group 3, and finally received separately by a plurality of detectors 4.

[0021] The coordinate discontinuous element 2 is a spatial reflection element. The spatial reflection element can be realized by a mirror, a reflecting prism or a special - shaped mirror with a certain spatial pose relationship, etc.

[0022] Embodiment 1:

[0023] As Figure 1 shown, in an embodiment of the present invention, the rear - end array splicing structure of a multi - channel large - field - of - view high - resolution imaging system includes a primary imaging lens group 1, two coordinate discontinuous elements 2, three secondary imaging lens groups 3 and three detectors 4, forming an adjacent linear arrangement form, namely, a 1×3 linear arrangement form.

[0024] The two coordinate discontinuous elements 2 of this embodiment are respectively located between the primary imaging lens group 1 and the two secondary imaging lens groups 3. A single secondary imaging lens group 3 is located at the center of the array and directly corresponds to the detector 4. The coordinate discontinuous element 2 reflects the remaining light beams in the upper and lower directions in the vertical direction.

[0025] At this time, the back focal length of the multi - channel large - field - of - view high - resolution imaging system needs to satisfy the following formula:

[0026]

[0027] Wherein, is the included angle between the central axis of the secondary imaging lens group 3 and the central axis of the coordinate discontinuity element 2, is the distance from the primary imaging lens group 1 to the secondary imaging lens group 3, is the distance from the primary imaging lens group 1 to the coordinate discontinuity element 2, is the distance from the coordinate discontinuity element 2 to the secondary imaging lens group 2, is the included angle between the centerlines of adjacent secondary imaging lens groups 3, is the back intercept of the secondary imaging lens group 3, is the semi-height of the detector 4.

[0028] Embodiment 2:

[0029] As Figure 2 shown, the back-end array splicing structure of the multi-channel large field of view high-resolution imaging system includes a primary imaging lens group 1, two coordinate discontinuity elements 2, three secondary imaging lens groups 3 and three detectors 4, forming an adjacent linear arrangement form, namely a 1×3 linear arrangement form.

[0030] The coordinate discontinuity element 2 of this embodiment is located between multiple secondary imaging lens groups 3 and the detector 4. The coordinate discontinuity element 2 deflects the detector 4, and the secondary imaging lens group 3 and the detector 4 are no longer on the same axis. A single secondary imaging lens group 3 is located at the center of the array and directly corresponds to the detector 4. The coordinate discontinuity element 2 reflects the remaining light beams in the upper and lower two directions in the vertical direction.

[0031] At this time, the back intercept of the multi-channel large field of view high-resolution imaging system needs to satisfy the following formula:

[0032]

[0033] Wherein, is the included angle between the central axis of the secondary imaging lens group 3 and the central axis of the coordinate discontinuity element 2, is the distance from the primary imaging lens group 1 to the secondary imaging lens group 3, is the back intercept of the secondary imaging lens group 3, is the distance from the secondary imaging lens group 3 to the coordinate discontinuity element 2, is the distance from the coordinate discontinuity element 2 to the detector 4, is the included angle between the centerlines of adjacent secondary imaging lens groups 3, is the semi-height of the detector 4.

[0034] Embodiment 3:

[0035] As Figure 3As shown, the back-end array splicing structure of the multi-channel large field of view high-resolution imaging system includes a primary imaging lens group 1, eight coordinate discontinuity elements 2, nine secondary imaging lens groups 3, and nine detectors 4.

[0036] That is, when the number of secondary imaging lens groups 3 is 9 and they are arranged in a 3×3 layout, a single secondary imaging lens group 3 is located at the center of the array and directly corresponds to the detector 4; eight coordinate discontinuity elements 2 are inserted between the remaining eight secondary imaging lens groups 3 and the eight detectors 4 respectively. The coordinate discontinuity elements 2 deflect the light, and the light beam starts from the left in the horizontal direction and is reflected clockwise in turn to the left in the horizontal direction, to the upper left, upward in the vertical direction, to the upper right, to the right in the horizontal direction, to the lower right, downward in the vertical direction, and to the lower left, and finally is received by the eight detectors 4 respectively.

[0037] At this time, the condition for the detector array of the multi-channel large field of view high-resolution imaging system not to have mechanical collision is that the back focal length of the multi-channel large field of view high-resolution imaging system needs to satisfy the following formula;

[0038]

[0039] In the formula, is the spatial distance between adjacent coordinate discontinuity elements 2, is the distance from the primary imaging lens group 1 to the secondary imaging lens group 3, is the back focal length of the secondary imaging lens group 3, is the distance from the secondary imaging lens group 3 to the coordinate discontinuity element 2, is the distance from the coordinate discontinuity element 2 to the detector 4, is the included angle between the central axes of adjacent secondary imaging lens groups 3, is the semi-height of the detector 4.

[0040] In this article, specific examples are used to elaborate on the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. The back-end array splicing structure of a multi-channel large field of view and high-resolution imaging system, characterized in that The structure includes a primary imaging lens group (1), a plurality of coordinate discontinuous elements (2), a plurality of secondary imaging lens groups (3), and a plurality of detectors (4); When the number of the secondary imaging lens groups (3) is odd or even, they are evenly arranged. When the number of the secondary imaging lens groups (3) is odd, the central secondary imaging lens group (3) is located at the center of the array, directly corresponding to the detector (4), and the remaining secondary imaging lens groups (3) are arranged around the central secondary imaging lens group in an array. The coordinate discontinuous element (2) inserted disperses the optical path of the rear-end array, and finally reaches a plurality of detectors (4); when the number of the secondary imaging lens groups (3) is even, each secondary imaging lens group (3) has the coordinate discontinuous element (2) inserted to disperse the optical path of the rear-end array, and finally reaches the detector (4); When the coordinate discontinuous element (2) is located between the primary imaging lens group (1) and the plurality of secondary imaging lens groups (3), each coordinate discontinuous element (2) causes the secondary imaging lens group (3) and the detector (4) in the corresponding channel to deflect synchronously. In this case, the secondary imaging lens group (3) and the detector (4) are on the same axis; when the coordinate discontinuous element (2) is located between the plurality of secondary imaging lens groups (3) and the detector (4), each coordinate discontinuous element (2) causes the detector (4) in the corresponding channel to deflect. In this case, the secondary imaging lens group (3) and the detector (4) are no longer on the same axis; The object is first imaged by the primary imaging lens group (1) and then secondarily imaged by the secondary imaging lens group (3); the coordinate discontinuous element (2) is inserted between the primary imaging lens group (1) and the secondary imaging lens group (3) or between the secondary imaging lens group (3) and the detector (4) according to the selection, so as to disperse the rear-end array branch, and mechanical collision can be avoided; the final image is received separately by a plurality of detectors (4); When the coordinate discontinuous element (2) is located between the primary imaging lens group (1) and the secondary imaging lens group (3), and the number of the secondary imaging lens groups (3) is less than 5, the condition for the detector array of the multi-channel large field of view high-resolution imaging system not to have mechanical collision is that its back intercept needs to satisfy the following formula: , where is the angle between the central axis of the secondary imaging lens group (3) and the central axis of the coordinate discontinuity element (2), is the distance from the primary imaging lens group (1) to the secondary imaging lens group (3), is the distance from the primary imaging lens group (1) to the coordinate discontinuity element (2), is the distance from the coordinate discontinuity element (2) to the secondary imaging lens group (3), is the angle between the centerlines of adjacent secondary imaging lens groups (3), is the back focal length of the secondary imaging lens group (3), is the semi-height of the detector (4).

2. The back-end array splicing structure of a multi-channel large field of view high-resolution imaging system according to claim 1, characterized in that, The coordinate discontinuous element (2) is a spatial reflection element.

3. The back-end array splicing structure of a multi-channel large field of view high-resolution imaging system according to claim 1, characterized in that When the coordinate discontinuous element (2) is located between the plurality of secondary imaging lens groups (3) and the detector (4), and the number of the secondary imaging lens groups (3) is less than 5, the condition for the detector array of the multi-channel large field of view high-resolution imaging system not to have mechanical collision is that its back intercept needs to satisfy the following formula: , where is the angle between the central axis of the secondary imaging lens group (3) and the central axis of the coordinate discontinuity element (2), is the distance from the primary imaging lens group (1) to the secondary imaging lens group (3), is the back intercept of the secondary imaging lens group (3), is the distance from the secondary imaging lens group (3) to the coordinate discontinuity element (2), is the distance from the coordinate discontinuity element (2) to the detector (4), is the angle between the centerlines of adjacent secondary imaging lens groups (3), is the semi-height of the detector (4).

4. The back-end array splicing structure of a multi-channel large field of view high-resolution imaging system according to claim 1, characterized in that, When the coordinate discontinuous element (2) is located between the primary imaging lens group (1) and the plurality of secondary imaging lens groups (3), and the number of the secondary imaging lens groups (3) is greater than 5, the condition for the detector array of the multi-channel large field of view high-resolution imaging system not to have mechanical collision is that its back intercept needs to satisfy the following formula: , where is the spatial distance between adjacent coordinate discontinuity elements (2), is the distance from the primary imaging lens group (1) to the secondary imaging lens group (3), is the distance from the primary imaging lens group (1) to the coordinate discontinuity element (2), is the distance from the coordinate discontinuity element (2) to the secondary imaging lens group (3), is the back focal length of the secondary imaging lens group (3), is the angle between the central axes of adjacent secondary imaging lens groups (3), is the semi-height of the detector (4).

5. The back-end array splicing structure of a multi-channel large field of view high-resolution imaging system according to claim 1, characterized in that, When the coordinate discontinuous element (2) is located between the plurality of secondary imaging lens groups (3) and the detector (4), and the number of the secondary imaging lens groups (3) is greater than 5, the condition for the detector array of the multi-channel large field of view high-resolution imaging system not to have mechanical collision is that its back intercept needs to satisfy the following formula: , where is the spatial distance between adjacent coordinate discontinuity elements (2), is the distance from the primary imaging lens group (1) to the secondary imaging lens group (3), is the back intercept of the secondary imaging lens group (3), is the distance from the secondary imaging lens group (3) to the coordinate discontinuity element (2), is the distance from the coordinate discontinuity element (2) to the detector (4), is the angle between the central axes of adjacent secondary imaging lens groups (3), is the semi-height of the detector (4).

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