Common-aperture multimode optical system

Abstract

The utility model provides a common-aperture multimode optical system. The common-aperture multimode optical system comprises a first lens group, a beam splitting lens, an infrared detection assembly and a laser detection assembly which are coaxially arranged, the light splitting lens is arranged between the first lens group and the infrared detection assembly, the light splitting lens transmits infrared band light and reflects laser band light, the infrared detection assembly is located on a transmission light path of the light splitting lens, and the laser detection assembly is located on a reflection light path of the light splitting lens. The laser detection assembly is arranged between the first lens group and the beam splitting lens. According to the utility model, the internal lens is adopted to fold an optical path in the optical axis direction, the internal space of the optical system is efficiently utilized to realize a multiband optical path function, the spatial layout is compact, the optical axis stability is high, and the internal lens is adopted to replace a beam splitter to split light, so that the transmittance of the system is improved, and asymmetric aberration caused by the beam splitter is avoided. And the complexity of an aberration correction light path is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical design, and in particular relates to a common aperture multi-mode optical system. Background Art

[0002] In some applications, optical sensing systems are required to possess multispectral imaging and laser ranging capabilities, enabling rapid perception of surrounding conditions throughout the day and night under diverse environmental conditions, enabling real-time tracking and precise measurement of targets. Traditional solutions for achieving multi-mode detection rely on distributed multispectral detection systems or common-aperture internal beam splitters.

[0003] However, traditional distributed multispectral detection systems have separate components, resulting in low space utilization and difficulty in miniaturization. Furthermore, the distributed structural layout creates significant differences in the mechanical environments of each component, making it difficult to ensure consistent optical axes. Furthermore, the use of a common aperture internal beam splitter also results in low internal space utilization, poor imaging quality due to inherent aberrations in the beam splitter, and poor temperature adaptability. Utility Model Content

[0004] The purpose of the utility model is to provide a common aperture multi-mode optical system, which can at least solve some of the defects in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A common-aperture multi-mode optical system comprises a coaxially arranged first lens group, a spectroscopic lens, an infrared detection assembly, and a laser detection assembly; the spectroscopic lens is disposed between the first lens group and the infrared detection assembly, the spectroscopic lens transmits infrared light and reflects laser light, the infrared detection assembly is located on the transmitted light path of the spectroscopic lens, the laser detection assembly is located on the reflected light path of the spectroscopic lens, and the laser detection assembly is disposed between the first lens group and the spectroscopic lens.

[0007] Furthermore, the first lens group includes a coaxially arranged lens 1 and a lens 2, wherein the lens 2 is located between the lens 1 and the laser detection assembly, and both the lens 1 and the lens 2 are meniscus-shaped structures with the convex surface facing away from the side of the spectroscopic lens.

[0008] Furthermore, the cross-section thickness of the lens 1 is uniform, and the cross-section of the lens 2 is thick in the middle and thin at both ends.

[0009] Furthermore, the incident surface of the beam splitter lens is coated with a beam splitting film.

[0010] Furthermore, the light-transmitting surface of the beam splitter lens is a diffraction surface.

[0011] Furthermore, the infrared detection component includes an infrared detector and a compensation component for compensating for optical path aberrations, and the compensation component is located between the spectroscopic lens and the infrared detector.

[0012] Furthermore, the compensation component includes a coaxially arranged lens three and lens four, the lens four is located between the lens three and the infrared detector, and both the lens three and the lens four are meniscus-shaped structures with the convex surface facing one side of the splitter lens.

[0013] Furthermore, the laser detection assembly includes a second lens group for collecting laser energy and a laser detector, and the second lens group is located between the beam splitting lens and the laser detector.

[0014] Furthermore, the second lens group includes a coaxially arranged lens five and a lens six, the lens six is ​​located between the lens five and the laser detector, and the lens five and the lens six are meniscus-shaped structures with the convex surface facing the side of the spectroscopic lens.

[0015] Furthermore, the laser detection assembly also includes a filter, and the filter is located between the second lens group and the beam splitter lens.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The common-aperture multi-mode optical system provided by the present invention uses internal lenses (i.e., spectroscopic lenses) to split light instead of using a spectroscopic plate to split light, thereby improving the transmittance of the system and avoiding the asymmetric aberration caused by the spectroscopic plate, thereby greatly reducing the complexity of the aberration correction optical path.

[0018] (2) The common-aperture multi-mode optical system provided by the present invention adopts internal lenses to fold the optical path in the direction of the optical axis, and effectively utilizes the internal space of the optical system to realize the multi-band optical path function. The spatial layout is compact, the optical axis stability is high, and it is also conducive to the athermal design of the optical path and the performance maintenance of the system at high and low temperatures.

[0019] The present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the common aperture multi-mode optical system of the utility model.

[0021] Explanation of the accompanying reference numerals: 1. Lens one; 2. Lens two; 3. Spectroscopic lens; 4. Lens three; 5. Lens four; 6. Infrared detector; 7. Filter; 8. Lens five; 9. Lens six; 10. Laser detector. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; and in the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0026] like Figure 1As shown, this embodiment provides a common-aperture multimode optical system, comprising a coaxially arranged first lens group, a beam splitter lens 3, an infrared detection assembly, and a laser detection assembly; the beam splitter lens 3 is disposed between the first lens group and the infrared detection assembly, and transmits infrared light and reflects laser light. The infrared detection assembly is located on the transmitted light path of the beam splitter lens 3, and the laser detection assembly is located on the reflected light path of the beam splitter lens 3. The laser detection assembly is disposed between the first lens group and the beam splitter lens 3. In this embodiment, the first lens group is used to collect wide-band light, including infrared light and laser light. The beam splitter lens 3 is used to transmit infrared light and reflect laser light, thereby achieving spectroscopic separation of infrared light and laser light. The infrared detection assembly is used to receive infrared light transmitted by the beam splitter lens 3 to perform infrared optical path imaging, and the laser detection assembly is used to receive laser light reflected by the beam splitter lens 3 to achieve laser spot tracking and angle detection functions.

[0027] During operation, the broadband light collected by the first lens group is incident on the beam splitter lens 3. At this lens, the infrared light is transmitted to the infrared detection assembly, completing infrared optical path imaging. Simultaneously, the laser light is reflected and folded toward the optical axis to the laser detection assembly, enabling laser spot tracking and angle detection. The common-aperture multimode optical system provided in this embodiment uses an internal lens (i.e., the beam splitter lens 3) to fold the optical path along the optical axis, efficiently utilizing the internal space of the optical system to achieve multi-band optical path functionality. This results in a compact spatial layout and high optical axis stability. Furthermore, the use of internal lenses for light splitting instead of beam splitters improves the system's transmittance while avoiding the asymmetric aberrations introduced by the beam splitter, significantly reducing the complexity of the aberration correction optical path.

[0028] As a specific embodiment, the first lens group includes coaxially arranged lens 1 and lens 2, located between lens 1 and the laser detection assembly. Both lens 1 and lens 2 are meniscus-shaped structures, with the convex surface facing away from the beam splitter lens 3. This allows light rays passing through lens 1 and lens 2 in sequence to converge toward the optical axis and be incident on beam splitter lens 3, thereby further improving the system's transmittance and the compactness of its spatial layout. Optimally, the cross-sectional thickness of lens 1 is designed to be uniform, while the cross-sectional thickness of lens 2 is designed to be thicker in the middle and thinner at both ends.

[0029] Optionally, the spectroscopic lens 3 has a structure that is thin in the middle and thick at both ends; optimized, a spectroscopic film can be coated on the incident surface of the spectroscopic lens 3 to transmit infrared light and reflect laser light, thereby improving the spectroscopic effect of the spectroscopic lens; the transmission light output surface of the spectroscopic lens 3 is designed as a diffraction surface, which can correct the chromatic aberration of the transmitted infrared light, and is conducive to the athermal design of the optical path.

[0030] In an optional embodiment, the infrared detection component includes an infrared detector 6 and a compensation component, and the compensation component is located between the spectroscopic lens 3 and the infrared detector 6, wherein the compensation component is used to compensate for the aberration of the front optical path and realize the aberration correction of the infrared optical path. Since the internal lens is used instead of the spectroscopic plate for splitting light in this embodiment, the asymmetric aberration caused by the spectroscopic plate will not be generated, thereby reducing the complexity of the aberration correction optical path. On this basis, in some embodiments, the compensation component can be designed to include coaxially arranged lens three 4 and lens four 5, and the lens four 5 is located between the lens three 4 and the infrared detector 6. The lens three 4 and the lens four 5 are both meniscus structures with the convex surface facing the side of the spectroscopic lens 3. The infrared band light transmitted by the spectroscopic lens 3 passes through the lens three 4 and the lens four 5 in turn for aberration compensation and then is incident on the infrared detector 6, thereby improving the imaging quality of the infrared optical path.

[0031] As a specific embodiment, the laser detection assembly includes a second lens group and a laser detector 10. The second lens group is located between the beam splitter lens 3 and the laser detector 10. The laser light reflected by the beam splitter lens 3 passes through the second lens group and collects the laser energy on the laser detector 10, thereby realizing the laser spot tracking and angle detection functions. Specifically, the second lens group includes a coaxially arranged lens 5 8 and a lens 6 9. The lens 6 9 is located between the lens 5 8 and the laser detector 10. The lenses 5 8 and 6 9 are meniscus structures with the convex surface facing the side of the beam splitter lens 3.

[0032] Optimally, the laser detection assembly further includes a filter 7, which is located between the second lens group and the beam splitter lens 3. The filter 7 is used to achieve narrow-band filtering of the laser light path, thereby improving the laser spot tracking and angle detection effects.

[0033] In summary, the common-aperture multi-mode optical system provided by the present invention adopts internal lens splitting instead of beam splitting, which improves the transmittance of the system and does not produce asymmetric aberrations caused by the beam splitter, greatly reducing the complexity of the aberration correction optical path; and by folding the optical path in the optical axis direction through the internal lens, the internal space of the optical system is efficiently utilized to realize the multi-band optical path function, with a compact spatial layout and high optical axis stability, and is conducive to the athermal design of the optical path and the maintenance of system performance at high and low temperatures.

[0034] The above examples are merely illustrative of the present invention and do not limit the scope of protection of the present invention. Any design that is identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. A common-aperture multimode optical system, characterized in that: It includes a coaxially arranged first lens group, a spectroscopic lens, an infrared detection component and a laser detection component; the spectroscopic lens is arranged between the first lens group and the infrared detection component, the spectroscopic lens transmits infrared band light and reflects laser band light, the infrared detection component is located on the transmitted light path of the spectroscopic lens, the laser detection component is located on the reflected light path of the spectroscopic lens, and the laser detection component is arranged between the first lens group and the spectroscopic lens.

2. The common-aperture multimode optical system according to claim 1, wherein: The first lens group includes a coaxially arranged lens 1 and a lens 2, wherein the lens 2 is located between the lens 1 and the laser detection assembly, and both the lens 1 and the lens 2 are meniscus structures with the convex surface facing away from the side of the beam splitter lens.

3. The common-aperture multimode optical system according to claim 2, wherein: The cross-section thickness of the lens 1 is uniform, and the cross-section of the lens 2 is thick in the middle and thin at both ends.

4. The common-aperture multimode optical system according to claim 1, wherein: The incident surface of the beam splitter lens is coated with a beam splitting film.

5. The common-aperture multimode optical system according to claim 1, wherein: The light-transmitting surface of the beam splitter lens is a diffraction surface.

6. The common-aperture multimode optical system according to claim 1, wherein: The infrared detection component includes an infrared detector and a compensation component for compensating for optical path aberrations, and the compensation component is located between the beam splitting lens and the infrared detector.

7. The common-aperture multimode optical system according to claim 6, wherein: The compensation component includes a coaxially arranged lens three and lens four, wherein the lens four is located between the lens three and the infrared detector, and both the lens three and the lens four are meniscus-shaped structures with the convex surface facing one side of the beam splitting lens.

8. The common-aperture multi-mode optical system according to claim 1, wherein: The laser detection assembly includes a second lens group for collecting laser energy and a laser detector, wherein the second lens group is located between the beam splitting lens and the laser detector.

9. The common-aperture multimode optical system according to claim 8, wherein: The second lens group includes a coaxially arranged lens five and a lens six, wherein the lens six is ​​located between the lens five and the laser detector, and the lens five and the lens six are meniscus-shaped structures with the convex surface facing the side of the beam splitter lens.

10. The common-aperture multi-mode optical system according to claim 8, wherein: The laser detection assembly further includes a filter, which is located between the second lens group and the beam splitter lens.

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