CN112099179A

CN112099179A - Dual CMOS continuous zooming television system based on prism beam splitting

Info

Publication number: CN112099179A
Application number: CN202011058841.XA
Authority: CN
Inventors: 侯志超; 黄德军; 郭太波; 陈长鸣; 李新火
Original assignee: HUBEI HUAZHONG PHOTOELECTRIC SCIENCE AND TECHNOLOGY Ltd
Current assignee: Hubei Huazhong Changjiang Photoelectric Technology Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-12-18
Anticipated expiration: 2040-09-30
Also published as: CN112099179B

Abstract

The invention relates to a double CMOS continuous zooming television system based on prism beam splitting, which mainly comprises a continuous zoom lens, a beam splitting prism group, a color CMOS group and a near infrared CMOS group, wherein the beam splitting prism group is formed by bonding two right-angle prisms. After external light passes through the continuous zoom lens, the light is divided into two beams of light in a visible light wave band with the wavelength range of 0.4um-0.6um and a near infrared wave band with the wavelength range of 0.7um-0.9um by the light splitting prism group, and the two beams of light respectively enter the color CMOS group and the near infrared CMOS group for imaging and respectively correspond to two working modes of visible light imaging and near infrared imaging. The visible light imaging working mode is used for outputting a color high-definition image under the condition of good environmental visibility, so that a target can be observed clearly; the near-infrared imaging working mode is used for super-visibility observation under conditions of poor visibility such as rain, snow, mist, early morning, dusk and the like. The television system provided by the invention has the advantages of small volume, light weight, high sensitivity, strong function and the like, and has a better application prospect in various fields.

Description

Dual CMOS continuous zooming television system based on prism beam splitting

Technical Field

The invention relates to the technical field of photoelectric equipment, in particular to a double CMOS continuous zooming television system based on prism beam splitting.

Background

With the development of science and technology, imaging technology becomes an important means for acquiring high-precision information of a target. The existing imaging device is generally composed of an optical lens, a photoelectric sensor, a back-end processing circuit and the like.

In some cases, the observation field needs to be as large as possible so as to observe the situation and search the target, and after the target is found, the long-focus small-field amplification target with a long action distance and a large amplification factor is needed so as to accurately identify and track the target. Therefore, the imaging device generally adopts the zoom lens, and the photoelectric sensor senses the target optical image transmitted by the zoom lens and converts the target optical image into an electric signal, and the electric signal is processed by the rear-end processing circuit to form a target video image which can be directly observed by human eyes and output the target video image. Due to the technical limitation, the optical wavelength which can be sensed by the photoelectric sensor has a certain range, the central wavelength sensed by the color CMOS is about 0.6um generally, the inductivity of the color CMOS to the near-infrared wavelength is low, and the inductivity of the near-infrared CMOS to the near-infrared optical band is high.

In addition, when the environmental visibility is good, the imaging reconnaissance equipment in the visible light imaging working mode can provide vivid colored on-site real-time images, so that the situation can be observed conveniently, and the target can be searched conveniently; when visibility is poor (such as early morning and evening) and the target needs to be observed and tracked, the imaging component in the near-infrared working mode can observe the target over the sight distance and in a fog-penetrating mode. To achieve the goal of continuous zoom observation in the visible light imaging mode and the near infrared imaging mode, two sets of continuous zoom television systems are generally required to be used in cooperation, but the product cost, the volume and the weight are increased. Certainly, a zoom lens can be used in cooperation with a color CMOS component, and the fog-penetrating observation is realized by using the weak induction of the color CMOS component to the near-infrared band, but in the scheme, a special image processing circuit is generally added in the back end processing for improving the fog-penetrating observation effect, and meanwhile, a filter switching structure is added in front of the CMOS, so that the structure not only greatly increases the cost, but also reduces the reliability.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a dual-CMOS continuous zooming television system based on prism beam splitting with a brand-new structure, which comprises a continuous zoom lens 1, a beam splitting prism group 2, a color CMOS group 3 and a near-infrared CMOS group 4. The beam splitting prism group 2 comprises a small right-angle prism I19 and a small right-angle prism II 20, and the right-angle side of the small right-angle prism I19 is fixedly connected with the hypotenuse of the small right-angle prism II 20; after passing through the continuous zoom lens 1, the external light is refracted by the beam splitting prism group 2 into two beams of light, and the two beams of light respectively enter the color CMOS group 3 and the near-infrared CMOS group 4 for imaging, so that a visible light image and a near-infrared image are obtained.

Further, the small rectangular prism I19 and the small rectangular prism II 20 are all selected from rectangular prisms with the apex angle of 30 degrees, and the two prisms are larger and smaller.

Furthermore, the vertexes of the small right-angle prism I19 and the small right-angle prism II 20 are overlapped and then are bonded and fixed together, and a multilayer light splitting film system is plated between the binding surfaces of the two right-angle prisms.

Furthermore, the long right-angle side of the small right-angle prism I19 is fixedly connected with the hypotenuse of the small right-angle prism II 20, the other right-angle side of the small right-angle prism I19 is perpendicular to the axis of the zoom lens 1 and is opposite to incident light, the hypotenuse of the small right-angle prism I19 is arranged in parallel with the color CMOS group 3, and the long right-angle side of the small right-angle prism II 20 is arranged in parallel with the near-infrared CMOS group 4. Only with the position relation, the beam splitting prism group 2 can effectively divide the light emitted from the continuous zoom lens 1 into two beams, and the two beams enter the color CMOS group 3 and the near-infrared CMOS group 4 respectively, so that better visible light and near-infrared imaging effects are realized.

Further, a color filter 6 and a parallax trimming sheet 9 are arranged between the beam splitting prism group 2 and the color CMOS group 3, and a near-infrared filter 7 and a parallax trimming sheet 9 are arranged between the beam splitting prism group 2 and the near-infrared CMOS group 4.

Further, this continuous zoom television system still includes connecting seat 5, base 21, and beam splitting prism group 2 bonds on base 21, and base 21 passes through screw 25 and connecting seat 5 fixed connection, encapsulates beam splitting prism group 2 inside connecting seat 5 from this.

Furthermore, the connecting seat 5 is provided with three through holes, and the zoom lens 1, the color CMOS set 3 and the near-infrared CMOS set 4 are respectively and coaxially and fixedly connected with one of the through holes, thereby forming a light path channel.

Further, the color CMOS group 3 comprises a high-resolution color CMOS23 and a CMOS pedestal 22, and the near-infrared CMOS group 4 comprises a high-sensitivity near-infrared CMOS 24 and a CMOS pedestal 22; the high-resolution color CMOS23 and the high-sensitivity near-infrared CMOS 24 are respectively fixed on the respective corresponding CMOS seats 22, and the assembly body formed by the way is sleeved in the V-shaped seat 8 and is fastened by screws, and then is respectively and fixedly connected with the connecting seat 5. In brief, the color CMOS set 3 and the near-infrared CMOS set 4 are respectively and fixedly connected to the connecting base 5 through the V-shaped base 8.

Furthermore, the target light beam is split by the splitting prism group 2 to obtain two beams of light with the wavelength ranges of 0.4um-0.6um and 0.7um-0.9um, the former beam enters the color CMOS group 3 for imaging, and the latter beam enters the near-infrared CMOS group 4 for imaging.

Further, the zoom lens 1 includes an objective lens group 10, a zoom group 11, a compensation group 12, a rear fixing group 13, a lens tube 14, a zoom lens tube 15, a focusing gear 16, a zoom motor group 17, and a focusing motor group 18; a linear groove is arranged on the lens tube 14, a corresponding cam curve groove is arranged on the surface of the zoom lens tube 15, and a gear is also arranged at one end of the zoom lens tube; the surface of the focusing gear 16 is provided with a curve groove, and the end part is provided with a half-circle gear; the zoom group 11 and the compensation group 12 are fixedly arranged inside the lens tube 14, the zoom lens tube 15 is sleeved on the lens tube 14, and the rear fixing group 13 is fixed at one end of the lens tube 14 and is fixed with the objective lens group 10 and the other end of the lens tube; the pin passes through the cam curve slot on the zoom lens tube 15 and the straight line slot on the lens tube 14 and is respectively fixedly connected with the zoom group 11 and the compensation group 12; the pin is fixedly connected with the objective lens group 10 after passing through a curve groove on the focusing gear 16 and another straight line groove on the lens tube 14; a focusing motor set 18 and a zooming motor set 17 are fixed on the lens tube 14, and output shafts of the focusing motor set and the zooming motor set are respectively meshed with a gear and a focusing gear at the end part of the zooming lens tube for transmission; the zooming motor set 17 drives the zooming lens tube 15 to rotate, drives the pin to move along the cam curved groove, and the pin drives the zooming set 11 and the compensation set 12 to axially slide back and forth along the linear groove of the lens tube 14, so that the continuous zooming of the lens is realized; the focusing motor set 18 drives the focusing gear 16 to rotate, so as to drive the pin to move along the curved slot, and the pin drives the objective lens set 10 to axially slide back and forth along the other linear slot of the lens tube 14, thereby realizing the micro-focusing of the objective lens set 10.

Compared with the prior art, the invention has the beneficial effects that: (a) two 30-degree right-angle beam splitters which are stacked together are utilized to split a target light beam input by the zoom lens into two light waves, and then the two light waves are respectively input into a color CMOS group and a near-infrared CMOS group for imaging; (b) two working modes are provided, when the environmental visibility is good, the visible light imaging working mode is adopted, and at the moment, a colorful high-definition image is output, so that a target image is really restored and is convenient to observe; when facing environments with poor visibility such as rain, snow, mist, early morning, dusk and the like, a near-infrared imaging working mode is used, images output by a near-infrared CMOS group are adopted, super-visibility observation can be realized by using the fog penetration performance of a near-infrared waveband, and the two working modes are not interfered with each other and can be randomly converted or used simultaneously; (3) the television system has the advantages of simple structure, stable performance and better application prospect.

Drawings

FIG. 1 is a front view of a television system of the present invention;

FIG. 2 is a top view of the television system of the present invention;

FIG. 3 is a cross-sectional view of FIG. 1 (the cross-section being a plane perpendicular to the page and passing through the central axis);

FIG. 4 is a cross-sectional view (the cross-section being a plane parallel to the plane of the paper and passing through the central axis) of the assembly made up of the parts 2-5 of FIG. 1

FIG. 5 is a schematic structural diagram of a beam splitting prism assembly;

FIG. 6 is a perspective view of a television system of the present invention;

FIG. 7 is a perspective view of a television system of the present invention;

fig. 8 is a structural schematic diagram of a focusing gear.

The system comprises a 1-continuous zoom lens, a 2-beam splitting prism group, a 3-color CMOS group, a 4-near infrared CMOS group, a 5-connecting seat, a 6-color filter, a 7-near infrared filter, an 8-V-shaped seat, a 9-parallax trimming sheet, a 10-objective lens group, an 11-zoom group, a 12-compensation group, a 13-rear fixing group, a 14-lens tube, a 15-zoom lens tube, a 16-focusing gear, a 17-zoom motor group, an 18-focusing motor group, a 19-small right-angle prism I, a 20-small right-angle prism II, a 21-base, a 22-CMOS seat, a 23-high-resolution color CMOS, a 24-high-sensitivity near infrared CMOS and a 25-screw.

Detailed Description

In order to make the technical solution and the advantages of the present invention fully understood by those skilled in the art, the following detailed description and the accompanying drawings are included for further explanation

A double CMOS continuous zooming television system based on prism beam splitting mainly comprises a continuous zoom lens 1, a beam splitting prism group 2, a color CMOS group 3, a near infrared CMOS group 4, a connecting seat 5, a color filter 6, a near infrared filter 7, a V-shaped seat 8 and a parallax trimming 9.

The zoom lens 1 comprises an objective lens group 10, a zoom group 11, a compensation group 12, a rear fixing group 13, a lens tube 14, a zoom lens tube 15, a focusing gear 16, a zoom motor group 17 and a focusing motor group 18. The lens tube 14 is composed of two cylinders with different diameters, a linear groove a is arranged on the surface of the thick cylinder, and a linear groove b is arranged on the thin cylinder. Two cam curve grooves are symmetrically arranged on the surface of the zoom lens tube 15, and a gear is arranged at one end of the zoom lens tube. The focusing gear 16 is provided with a semi-circle gear at the end of a curve groove on the surface, and the objective lens group 10, the zoom group 11, the compensation group 12 and the rear fixing group 13 all comprise a lens frame and an optical lens group fixed in the lens frame.

During assembly, the zoom group 11 and the compensation group 12 are firstly installed inside the lens tube 14, then the zoom lens tube 15 is sleeved on the lens tube 14, and finally the objective lens group 10 is installed at one end of the lens tube 14 and the rear fixing group 13 is installed at the other end of the lens tube. Two groups of pins respectively pass through a cam curve groove on the zoom lens tube 15 and a straight line groove b on the lens tube 14 and are respectively fixedly connected with the zoom group 11 and the compensation group 12; another group of pins are fixedly connected with the objective lens group 10 after passing through a curve groove on the focusing gear 16 and a linear groove a on the lens tube 14. The focusing motor set 18 and the zooming motor set 17 are fixed on the lens tube 14, and output shafts of the focusing motor set and the zooming motor set are respectively meshed with a gear and a focusing gear at the end part of the zooming lens tube for transmission. When the zooming motor set 17 works, the zooming lens tube 15 is driven to rotate to drive the pin to move along the cam curved groove, and the pin drives the zooming set 11 and the compensation set 12 to move back and forth along the linear groove b of the lens tube 14, so that the continuous zooming of the lens is realized. When the focusing motor set 18 works, the focusing gear 16 is driven to rotate to drive the pin to move along the curved groove, and the pin drives the objective lens set 10 to move back and forth along the linear groove a of the lens tube 14, so that micro focusing of the objective lens set 10 is realized. The rear fixing group 13 is arranged at the tail part of the lens tube 14 and is mainly used for fine adjustment of the combined focal length of the continuous zoom lens system, and the imaging of the system is ensured to fall on the image surface of the imaging lens. With regard to the specific structure and principle of the zoom lens of the present invention, reference may be made to the series of achievements of the previously applied invention patents, namely "a zoom lens (CN 111239991A)", "a zoom lens with large field of view and high zoom ratio based on double-group compensation", etc.

The beam splitting prism group 2 is formed by bonding a large rectangular prism and a small rectangular prism (19 and 20) with an apex angle of 30 degrees as shown in figure 5, and a multilayer beam splitting film system is plated on the bonding surface of the two. The beam splitting prism group 2 is adhered in the base 21 by photosensitive glue and then fixedly packaged inside the connecting seat 5 by three screws. The connecting seat 5 is of a special-shaped structure, the surface of the connecting seat is provided with 3 connecting holes (through holes), and the connecting hole on the left side is fixed at the tail part of the zoom lens 1 through a screw. The connecting seat 5 is matched with the continuous zoom lens 1 through a high-precision shaft hole, so that the accuracy of a light path channel is ensured. The other two connecting holes of the connecting seat 5 are respectively positioned on the two inclined planes, the upper right inclined plane is sequentially provided with a color filter 6 and a parallax trimming 9, and the lower right inclined plane is sequentially provided with a near infrared filter 7 and a parallax trimming 9. The color CMOS group 3 is mainly composed of the CMOS pad 22 and the high resolution color CMOS23, and the near-infrared CMOS group 4 is mainly composed of the CMOS pad 22 and the high sensitivity near-infrared CMOS 24. The color CMOS group 3 and the near-infrared CMOS group 4 are sleeved on the V-shaped seat 8, compress the color filter 6, the infrared filter 7 and the parallax trimming 9, and are locked with the connecting seat 5 through 4 screws 25.

After passing through the continuous zoom lens 1, the external light is divided into two light waves of a visible light wave band with the wavelength range of 0.4um-0.6um and a near infrared wave band with the wavelength range of 0.7um-0.9um by the beam splitting prism group 2, and the two light waves respectively enter the color CMOS group 3 and the near infrared CMOS group 3 for imaging, so that the continuous zoom television system can provide two working modes of visible light imaging and near infrared imaging. When the environmental visibility is good, a visible light imaging working mode is adopted, so that a colorful high-definition image can be output, and a target image is really restored to facilitate clear observation; when the environment with poor visibility such as rain, snow, mist, early morning, dusk and the like is faced, the super-visibility observation is realized by observing the image output by the near-infrared CMOS group by using a near-infrared imaging working mode and utilizing the fog penetration performance of a near-infrared band.

Because the wavelength ranges of the light beams sensed by the color CMOS group 3 and the near-infrared CMOS group 4 are different but share the same set of zoom lens 1, the color CMOS group 3 and the near-infrared CMOS group 4 need to be respectively corrected in order to ensure respective parfocal property of visible light imaging and near-infrared imaging and parallelism of optical axes of visible light imaging and near-infrared imaging. Firstly, aligning a product to a collimator tube with the thickness of 500mm, and trimming the thickness of a parallax trimming sheet 9 in front of a color CMOS group 3 to ensure that the imaging of the large-view-field color CMOS group 3 is in the clearest state; and adjusting the continuous zoom lens 1 to a small view field, adjusting the objective lens group 10 to enable an output image of the small view field to be in the clearest state, keeping the focusing objective lens group stationary, aligning a product to another 500mm parallel tube, and trimming the thickness of a parallax trimming sheet 9 in front of the near-infrared CMOS group 4. The collimator adjusts the position of the dividing plane of the collimator to meet the detection requirement of the near infrared band. Adjusting the small visual field of the near-infrared CMOS group 4 to the clearest position, aiming the product at a distant scene, slightly trimming the thickness of a parallax trimming sheet in front of the near-infrared CMOS group 4, and ensuring that the large visual field of the near-infrared is at the clearest position; placing the product in front of an off-axis collimator, adjusting a screw 25 of a color CMOS group 3, and collimating the optical axes of large and small visual fields imaged by visible light; adjusting the zoom lens 1 to a small view field, and adjusting the objective lens group 10 to enable an output image of the small view field to be in a clearest state; keeping the objective lens group 10 still, switching to a near-infrared working mode, adjusting a screw 25 of the near-infrared CMOS group 4, and collimating the optical axes of the large and small near-infrared imaging fields.

The invention realizes the dual-mode observation of the same continuous zoom optical path, greatly improves the environmental adaptability of products, and can realize high-definition color observation when the visibility is high and super-visibility observation when the visibility is low. The whole television system has small volume, light weight and high sensitivity, and is widely applied in various fields.

Claims

1. A double CMOS continuous zooming TV system based on prism beam splitting is characterized in that: the television system comprises a continuous zoom lens (1), a light splitting prism group (2), a color CMOS group (3) and a near-infrared CMOS group (4); the light splitting prism group (2) comprises a small right-angle prism I (19) and a small right-angle prism II (20), and the right-angle side of the small right-angle prism I (19) is fixedly connected with the hypotenuse of the small right-angle prism II (20); after passing through the continuous zoom lens (1), the external light is refracted by the beam splitting prism group (2) into two beams of light, and the two beams of light respectively enter the color CMOS group (3) and the near-infrared CMOS group (4) for imaging, so that a visible light image and a near-infrared image are obtained.

2. The dual CMOS continuous zoom television system of claim 1, wherein: the small right-angle prism I (19) and the small right-angle prism II (20) are both selected from right-angle prisms with the apex angle of 30 degrees, and the two prisms are large and small.

3. The dual CMOS continuous zoom television system of claim 1, wherein: the vertexes of the small right-angle prism I (19) and the small right-angle prism II (20) are overlapped and then are bonded and fixed together, and a multilayer light splitting film system is plated between the binding surfaces of the two right-angle prisms.

4. The dual CMOS continuous zoom television system of claim 1 or 3, wherein: the long right-angle side of the small right-angle prism I (19) is fixedly connected with the bevel side of the small right-angle prism II (20), the other right-angle side of the small right-angle prism I (19) is perpendicular to the axis of the continuous zoom lens (1) and is just opposite to incident light, the bevel side of the small right-angle prism I (19) is parallel to the color CMOS group (3), and the long right-angle side of the small right-angle prism II (20) is parallel to the near-infrared CMOS group (4).

5. The dual CMOS continuous zoom television system of claim 1, wherein: a color filter (6) and a parallax trimming sheet (9) are arranged between the light splitting prism group (2) and the color CMOS group (3), and a near infrared filter (7) and a parallax trimming sheet (9) are arranged between the light splitting prism group (2) and the near infrared CMOS group (4).

6. The dual CMOS continuous zoom television system of claim 1, wherein: the television system further comprises a connecting seat (5) and a base (21), wherein the light splitting prism group (2) is fixed on the base (21), and the base (21) is fixedly connected with the connecting seat (5), so that the light splitting prism group (2) is packaged inside the connecting seat (5).

7. The dual CMOS continuous zoom television system of claim 6, wherein: the connecting seat (5) is also provided with three through holes, and the continuous zoom lens (1), the color CMOS group (3) and the near-infrared CMOS group (4) are respectively coaxially and fixedly connected with one of the through holes, so that a light path channel is formed.

8. The dual CMOS continuous zoom television system of claim 1, wherein: the color CMOS group (3) comprises a high-resolution color CMOS (23) and a CMOS seat (22), and the near-infrared CMOS group (4) comprises a high-sensitivity near-infrared CMOS (24) and a CMOS seat (22); the high-resolution color CMOS (23) and the high-sensitivity near-infrared CMOS (24) are respectively fixed on the corresponding CMOS seats (22), and the assembly body formed by the method is sleeved in the V-shaped seat (8) and fastened by screws and then respectively fixedly connected with the connecting seat (5).

9. The dual CMOS continuous zoom television system of claim 1, wherein: the target light beam is split by the light splitting prism group (2) to obtain two beams of light with the wavelength ranges of 0.4um-0.6um and 0.7um-0.9um, the former beam enters the color CMOS group (3) for imaging, and the latter beam enters the near infrared CMOS group (4) for imaging.

10. The dual CMOS continuous zoom television system of claim 1, wherein: the continuous zoom lens (1) comprises an objective lens group (10), a zoom group (11), a compensation group (12), a rear fixing group (13), a lens tube (14), a zoom lens tube (15), a focusing gear (16), a zoom motor group (17) and a focusing motor group (18); a linear groove is arranged on the lens tube (14), a corresponding cam curve groove is arranged on the surface of the zoom lens tube (15), and a gear is also arranged at one end of the zoom lens tube; the surface of the focusing gear (16) is provided with a curve groove, and the end part is provided with a half-circle gear; the zoom group (11) and the compensation group (12) are fixedly arranged in the lens tube (14), the zoom lens tube (15) is sleeved on the lens tube (14), one end of the lens tube (14) is fixedly provided with the objective lens group (10), and the other end of the lens tube (14) is fixedly provided with the rear fixing group (13); the pin is respectively fixedly connected with the zoom group (11) and the compensation group (12) after passing through a cam curve groove on the zoom lens tube (15) and a straight line groove on the lens tube (14); the pin is fixedly connected with the objective lens group (10) after passing through a curve groove on the focusing gear (16) and another straight line groove on the lens tube (14); a focusing motor set (18) and a zooming motor set (17) are fixed on the lens tube (14), and output shafts of the focusing motor set and the zooming motor set are respectively meshed with a gear and a focusing gear at the end part of the zooming lens tube for transmission; the zooming motor set (17) drives the zooming lens tube (15) to rotate, drives the pin to move along the cam curve groove, and the pin drives the zooming set (11) and the compensation set (12) to axially slide back and forth along the linear groove of the lens tube (14), so that the continuous zooming of the lens is realized; the focusing motor set (18) drives the focusing gear (16) to rotate to drive the pin to move along the curve groove, and the pin drives the objective lens set (10) to axially slide back and forth along the other linear groove of the lens tube (14), so that fine focusing of the objective lens set (10) is realized.