Laser radar athermal optical receiving device

Abstract

The present invention provides a laser radar athermal optical receiving device, which includes a main lens barrel, a first lens, a rear lens barrel, a second lens, a reverse compensation layer and a reverse compensation movable ring; the fixed end of the reverse compensation layer is fixedly arranged on the main lens barrel; the limit end of the reverse compensation movable ring is fixedly arranged on the movable end of the reverse compensation layer, and the connecting end of the reverse compensation movable ring is fixedly arranged on the rear lens barrel; the expansion coefficient of the reverse compensation layer is greater than the expansion coefficient of the reverse compensation movable ring. The present invention sets a reverse compensation layer and a reverse compensation movable ring with different expansion coefficients, so that when the temperature rises, the reverse compensation layer can drive the reverse compensation movable ring and the rear lens barrel to move in a direction close to the first lens, so that when the temperature rises, the distance between the first lens and the second lens is reduced; and the change caused by the change of the refractive index caused by the temperature changes and thus the change of the focal plane.

Description

Technical Field

[0001] The invention relates to a laser radar athermal optical receiving device. Background Art

[0002] At present, the laser radar athermal optical receiving device is used to collect the laser echo emitted by the laser radar and reflected by the target object. The laser radar athermal optical receiving device installs a first lens at one end of the main lens barrel and a second lens at the other end. The first lens is used to collect the laser echo scattered back from a distance, and the second lens is used to convert the laser echo passing through the first lens into parallel light. Through the arrangement of the first lens and the second lens, the laser echo scattered back from a distance is converged into centimeter-level parallel light, that is, a spot diameter of about 10 mm. Then, by setting the third lens, the parallel light is converged into a spot with a diameter of about 10 microns, so as to increase the optical energy focused at the center of the focus.

[0003] However, due to the change in temperature, the refractive index of the lens will change, resulting in a change in its focal plane. When the temperature rises, the refractive index of the lens becomes smaller, and the focal plane moves closer to the lens. Therefore, when the temperature rises, if the distance between the first lens and the second lens is not changed, the second lens cannot convert the laser echo passing through the first lens into parallel light, which in turn leads to the inability to improve the optical energy focused at the center of the focal point. In the prior art, the distance between the first lens and the second lens is usually adjusted manually or electrically, but such an operation requires the addition of an adjustment mechanism, which results in a complex system structure and inconvenient operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a laser radar athermal optical receiving device.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A laser radar athermal optical receiving device, the laser radar athermal optical receiving device comprising a main lens barrel, a first lens mounted on the main lens barrel, a rear lens barrel and a second lens mounted in the rear lens barrel, the laser radar athermal optical receiving device also comprising:

[0007] a reverse compensation layer extending from the first lens to the second lens, the reverse compensation layer comprising a fixed end away from the first lens and a movable end close to the first lens, the fixed end being fixedly disposed on the main lens barrel seat;

[0008] A reverse compensation movable ring extending from the first lens to the second lens, the reverse compensation movable ring comprising a limit end fixed to the movable end, and a connection end fixed to the rear lens barrel seat; the rear lens barrel seat can move along the axial direction of the rear lens barrel seat relative to the main lens barrel seat;

[0009] The expansion coefficient of the reverse compensation layer is greater than the expansion coefficient of the reverse compensation movable ring.

[0010] Preferably, a cavity is provided inside the main lens barrel mount, the reverse compensation layer and the reverse compensation movable ring are provided in the cavity, and the reverse compensation layer is fixed to the inner surface of the main lens barrel mount.

[0011] In this solution, the reverse compensation layer and the reverse compensation movable ring are arranged inside the main lens barrel, ensuring that the deformation or displacement of the reverse compensation layer and the reverse compensation movable ring due to temperature changes will not be disturbed by external factors.

[0012] Preferably, the laser radar athermal optical receiving device further comprises a limiting ring, and the limiting ring is embedded in the cavity;

[0013] One end of the limiting ring is fixedly connected to the main lens barrel seat;

[0014] The other end of the limiting ring is fixedly connected to the fixed end of the reverse compensation layer.

[0015] In this solution, through the setting of the limiting ring, the reverse compensation layer can be first installed on the limiting ring, and then the limiting ring is fixedly connected to the main lens barrel mount to achieve a fixed connection between one end of the reverse compensation layer and the main lens barrel mount, which is convenient for users to assemble the overall device and at the same time provides a more stable connection for the reverse compensation layer.

[0016] Preferably, the axis of the limiting ring coincides with the axis of the main lens barrel seat; and the outer surface of the connecting end is tightly against the inner surface of the limiting ring.

[0017] In this scheme, through the setting of the limit ring, the axis of the reverse compensation movable ring abutting against the limit ring and the main lens barrel mount fixed on the limit ring coincide with each other, so that the rear lens barrel mount fixed on the reverse compensation movable ring can always be perpendicular to the axis direction of the main lens barrel mount when moving, thereby ensuring that the second lens installed in the rear lens barrel mount can always be perpendicular to the axis direction of the main lens barrel mount, that is, perpendicular to the optical path.

[0018] Preferably, a gap is provided between the inner surface of the reverse compensation layer and the outer surface of the reverse compensation movable ring.

[0019] In this solution, through such an arrangement, the expansion of the reverse compensation layer in the radial direction will not affect the stable movement of the reverse compensation movable ring along the axis of the main lens barrel seat.

[0020] Preferably, the expansion coefficient of the limiting ring is smaller than the expansion coefficient of the reverse compensation layer.

[0021] In this solution, the material of the limiting ring is designed so that the limiting ring is not easily deformed by heat, so that the limiting ring can better limit the reverse compensation movable ring.

[0022] Preferably, the reverse compensation movable ring is made of aluminum alloy, and the reverse compensation layer is made of nylon.

[0023] In this solution, by combining the reverse compensation movable ring made of aluminum alloy and the reverse compensation layer made of nylon, when the temperature rises, the reverse compensation layer made of nylon deforms and expands, and the movable end extends in the direction close to the first lens, driving the reverse compensation movable ring made of aluminum alloy to move in the direction close to the first lens, thereby driving the second lens close to the first lens, offsetting the change in refractive index caused by temperature and thus changing the focal plane.

[0024] Preferably, one end of the main lens cartridge away from the first lens is fixedly connected to a detection cartridge, a third lens is provided inside the detection cartridge, and the rear lens cartridge can move axially relative to the detection cartridge along the rear lens cartridge.

[0025] In this solution, by such an arrangement, the detection tube seat will not restrict the movement of the rear lens tube seat.

[0026] Preferably, an opening is radially formed at one end of the detection tube seat close to the second lens, the opening is located between the second lens and the third lens, and a filter assembly is installed in the opening.

[0027] In this solution, by setting the opening, the filter assembly can be inserted into the opening, thereby realizing rapid installation and removal of the filter assembly.

[0028] Preferably, the filter assembly comprises a filter and a frame, the filter is installed in the frame, and the frame is clamped in the opening.

[0029] The positive and progressive effects of the present invention are:

[0030] The present invention arranges a reverse compensation layer with a large expansion coefficient and a reverse compensation movable ring with a small expansion coefficient in a main lens barrel seat, so that when the temperature rises, the reverse compensation layer can drive the reverse compensation movable ring to move in a direction close to the first lens, thereby driving the rear lens barrel seat to move in a direction close to the first lens, thereby reducing the distance between the first lens and the second lens when the temperature rises; and realizing mechanical passive heat elimination, thereby offsetting the change caused by the change of the refractive index caused by the temperature and thus the change of the focal plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a partial structural schematic diagram of a laser radar athermal optical receiving device according to a preferred embodiment of the present invention.

[0032] Figure 2 It is a schematic structural diagram of a laser radar athermal optical receiving device according to a preferred embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the enlarged structure of part A of a preferred embodiment of the present invention.

[0034] Description of Reference Numerals

[0035] Main lens barrel mount 100

[0036] Cavity 110

[0037] First lens 200

[0038] Rear lens mount 300

[0039] Second lens 400

[0040] Detection tube holder 500

[0041] Opening 510

[0042] Filter assembly 520

[0043] Filter 521

[0044] Frame 522

[0045] Reverse compensation layer 600

[0046] Fixed end 610

[0047] Activity terminal 620

[0048] Reverse compensation ring 700

[0049] Limit end 710

[0050] Connection terminal 720

[0051] Positioning ring 730

[0052] Gap 740

[0053] Limiting ring 800

[0054] The third lens 900 DETAILED DESCRIPTION

[0055] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0056] like Figure 1-Figure 3 As shown, this embodiment provides a laser radar athermal optical receiving device, which includes a main lens mount 100, a first lens 200 installed in the main lens mount 100, a rear lens mount 300, a second lens 400 installed in the rear lens mount 300, a detection mount 500, a reverse compensation layer 600 and a reverse compensation movable ring 700.

[0057] The main lens barrel mount 100 has a cavity 110 disposed therein. In this embodiment, the reverse compensation layer 600 and the reverse compensation movable ring 700 are both disposed in the cavity 110. The reverse compensation layer 600 is fixed to the inner surface of the main lens barrel mount 100, and the reverse compensation movable ring 700 is disposed inside the reverse compensation layer 600. In other embodiments, the reverse compensation layer 600 and the reverse compensation movable ring 700 may also be sleeved on the outside of the main lens barrel mount 100. Figure 1 As shown, in this example, the reverse compensation layer 600 and the reverse compensation movable ring 700 are preferably arranged inside the main lens barrel mount 100, which can better ensure that the reverse compensation layer 600 and the reverse compensation movable ring 700 are not deformed or displaced due to temperature changes without being disturbed by external factors.

[0058] The reverse compensation layer 600 extends from the first lens 200 to the second lens 400, and includes a fixed end 610 away from the first lens 200, and a movable end 620 close to the first lens 200. The fixed end 610 is fixed to the main lens barrel mount 100. In this embodiment, a threaded connection is adopted. In other embodiments, it can also be fixed by welding or other methods. This does not limit the scope of protection of the present invention.

[0059] The reverse compensation movable ring 700 extends from the first lens 200 to the second lens 400, and includes a limit end 710 fixed to the movable end 620, and a connection end 720 fixed to the rear lens barrel seat 300. The rear lens barrel seat 300 can move along the axial direction of the rear lens barrel seat 300 relative to the main lens barrel seat 100. Figure 1As shown, the connection end 720 is farther away from the first lens 200 than the limiting end 710 , that is, the connection end 720 is an end close to the second lens 400 , and the limiting end 710 is an end close to the first lens 200 .

[0060] Among them, the expansion coefficient of the reverse compensation layer 600 is greater than the expansion coefficient of the reverse compensation movable ring 700. In this embodiment, aluminum alloy is preferably selected as the material of the reverse compensation movable ring 700, and nylon is selected as the material of the reverse compensation layer 600. By matching the reverse compensation movable ring 700 made of aluminum alloy and the reverse compensation layer 600 made of nylon, when the temperature rises, the reverse compensation layer 600 made of nylon deforms and expands, and the movable end 620 extends in the direction close to the first lens 200, driving the reverse compensation movable ring 700 made of aluminum alloy to move in the direction close to the first lens 200, thereby driving the second lens 400 to move in the direction close to the first lens 200, offsetting the change caused by the change of refractive index caused by temperature and thus changing the focal plane.

[0061] In addition, the laser radar athermal optical receiving device also includes a limit ring 800, which is embedded in the cavity 110. One end of the limit ring 800 is fixedly connected to the main lens barrel 100; the other end of the limit ring 800 is fixedly connected to the fixed end 610 of the reverse compensation layer 600. Through the setting of the limit ring 800, the reverse compensation layer 600 can be first installed on the limit ring 800, and then the limit ring 800 is fixedly connected to the main lens barrel 100 to achieve a fixed connection between one end of the reverse compensation layer 600 and the main lens barrel 100, which is convenient for users to assemble the entire device. At the same time, because the wall thickness of the main lens barrel 100 and the reverse compensation layer 600 are both thin, it is impossible to achieve a tight connection by directly connecting the two through fastening components such as bolts, which will cause damage to the main lens barrel 100 and the reverse compensation layer 600, and it is impossible to achieve multiple uses.

[0062] At the same time, the axis of the limit ring 800 coincides with the axis of the main lens barrel seat 100; the limit ring 800 is installed inside the main lens barrel seat 100 and is tightly against the inner surface of the main lens barrel seat 100, and the outer surface of the connecting end 720 is tightly against the inner surface of the limit ring 800. During use, if the reverse compensation movable ring 700 is radially positioned only by the reverse compensation layer 600, then during the process of the reverse compensation layer 600 being heated and expanded, once the various positions of the reverse compensation layer 600 expand unevenly, the reverse compensation movable ring 700 connected to the reverse compensation layer 600 will be offset in the radial direction, so that the axes of the first lens 200 and the second lens 400 do not coincide. In this embodiment, through such an arrangement, the axes of the reverse compensation movable ring 700 resting on the limit ring 800 and the rear lens barrel mount 300 fixed on the reverse compensation movable ring 700 can coincide with the axis of the main lens barrel mount 100, so that the rear lens barrel mount 300 fixed on the reverse compensation movable ring 700 can always be perpendicular to the axis direction of the main lens barrel mount 100 when moving, thereby ensuring that the second lens 400 installed in the rear lens barrel mount 300 can always be perpendicular to the axis direction of the main lens barrel mount 100, that is, perpendicular to the optical path.

[0063] The expansion coefficient of the limiting ring 800 is smaller than that of the reverse compensation layer 600. By designing the material of the limiting ring 800, the limiting ring 800 is not easily deformed by heat, so that the limiting ring 800 can better limit the reverse compensation movable ring 700.

[0064] like Figure 3 As shown, a gap 740 is provided between the inner surface of the reverse compensation layer 600 and the outer surface of the reverse compensation movable ring 700. By such a configuration, the radial expansion of the reverse compensation layer 600 will not affect the stable movement of the reverse compensation movable ring 700 along the axis of the main lens barrel mount 100.

[0065] like Figure 2 As shown, the end of the main lens barrel mount 100 away from the first lens 200 is fixedly connected to the detection barrel mount 500, and a third lens 900 is provided inside the detection barrel mount 500. The third lens 900 is used to collect parallel light passing through the second lens 400. The rear lens barrel mount 300 can move along the axial direction of the rear lens barrel mount 300 relative to the detection barrel mount 500, so that the detection barrel mount 500 will not restrict the movement of the rear lens barrel mount 300.

[0066] In addition, an opening 510 is radially provided at one end of the detection tube holder 500 close to the second lens 400, and the opening 510 is located between the second lens 400 and the third lens 900. The position of the opening 510 is used to insert a filter assembly 520, and the filter assembly 520 includes a filter 521 and a frame 522, wherein the filter 521 is installed in the lens frame 522, and the lens frame 522 is clamped in the opening 510. The filter 521 can effectively reduce the interference of stray light to the radar. Through the setting of the opening 510, the filter assembly 520 can be inserted in the opening 510, and the filter assembly 520 can be quickly loaded and unloaded. At the same time, in order to reduce the laser echo energy loss caused by the filter 521, the filter 521 should be installed as perpendicular to the parallel light path as much as possible, that is, the filter 521 should be as perpendicular to the axis of the main lens tube holder 100 as much as possible. The selection band of the filter 521 is determined by the laser used by the near-infrared laser radar. Different lasers use different filters 521. The bandwidth of the filter 521 in each band is divided into multiple specifications such as 1um and 2um. While expanding the application range of the laser wavelength, it also meets the anti-interference requirements of different radars. In order to reduce the laser echo energy loss caused by the filter 521, the optical path parallelism between the second lens 400 and the third lens 900 is better than 2′.

[0067] In the present invention, a first lens 200 is installed at one end of the main lens barrel seat 100, and a reverse compensation layer 600 is installed in the cavity 110 of the main lens barrel seat 100. The end of the reverse compensation layer 600 away from the first lens 200, that is, the fixed end 610, is fixed to the end of the main lens barrel seat 100 away from the first lens 200 through a limit ring 800; the end of the reverse compensation layer 600 close to the first lens 200, that is, the movable end 620 can be slidably arranged on the main lens barrel seat 100. The reverse compensation movable ring 700 is arranged inside the reverse compensation layer 600, and the axis of the reverse compensation movable ring 700 and the main lens barrel seat 100 coincide by abutting against the limit ring 800. At the same time, the end of the reverse compensation movable ring 700 close to the first lens 200, that is, the limit end 710, is fixed to the movable end 620 through a fastening component. In other embodiments, the two can also be fixed by welding or the like, which does not limit the protection scope of the present invention. In this embodiment, a positioning ring 730 is further provided on the outer surface of the limit end 710, and the outer surface of the positioning ring 730 is tightly against the inner surface of the main lens barrel seat 100. The positioning ring 730 can cooperate with the limiting ring 800, so that when the reverse compensation movable ring 700 moves, the axis of the reverse compensation movable ring 700 can always be kept coincident with the axis of the main lens barrel seat 100. The positioning ring 730 and the reverse compensation movable ring 700 can be an integrally formed part, or they can be separate parts that are tightly connected. The end of the reverse compensation movable ring 700 away from the first lens 200, that is, the connecting end 720, is against the limiting ring 800, and is fixed with the rear lens barrel seat 300. When the temperature rises, the reverse compensation layer 600 can drive the reverse compensation movable ring 700 to move toward the first lens 200, thereby driving the rear lens barrel mount 300 to move toward the first lens 200, thereby reducing the distance between the first lens 200 and the second lens 400 when the temperature rises; mechanical passive heat elimination is achieved to offset the change in the refractive index caused by the temperature, thereby changing the focal plane. When the temperature drops, the reverse compensation layer 600 shrinks, and the movable end 620 retracts away from the first lens 200, driving the reverse compensation movable ring 700 to move away from the first lens 200, so that the rear lens barrel mount 300 connected to the connection end 720 of the reverse compensation movable ring 700 is away from the first lens 200, thereby lengthening the distance between the first lens 200 and the second lens 400.

[0068] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0069] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A laser radar athermal optical receiving device, the laser radar athermal optical receiving device comprising a main lens barrel, a first lens mounted on the main lens barrel, a rear lens barrel and a second lens mounted in the rear lens barrel, It is characterized in that The laser radar athermal optical receiving device also includes: a reverse compensation layer extending from the first lens to the second lens, the reverse compensation layer comprising a fixed end away from the first lens and a movable end close to the first lens, the fixed end being fixedly disposed on the main lens barrel seat; A reverse compensation movable ring extending from the first lens to the second lens, the reverse compensation movable ring comprising a limit end fixed to the movable end, and a connection end fixed to the rear lens barrel seat; the rear lens barrel seat can move along the axial direction of the rear lens barrel seat relative to the main lens barrel seat; The expansion coefficient of the reverse compensation layer is greater than the expansion coefficient of the reverse compensation movable ring; A cavity is provided inside the main lens barrel seat, the reverse compensation layer and the reverse compensation movable ring are provided in the cavity, and the reverse compensation layer is fixed to the inner surface of the main lens barrel seat; The laser radar athermal optical receiving device further comprises a limiting ring, which is embedded in the cavity; One end of the limiting ring is fixedly connected to the main lens barrel seat; The other end of the limiting ring is fixedly connected to the fixed end of the reverse compensation layer; The axis of the limit ring coincides with the axis of the main lens barrel mount; the limit ring is installed inside the main lens barrel mount and tightly abuts against the inner surface of the main lens barrel mount, the outer surface of the connecting end tightly abuts against the inner surface of the limit ring, a gap is provided between the inner surface of the reverse compensation layer and the outer surface of the reverse compensation movable ring, and the expansion coefficient of the limit ring is smaller than the expansion coefficient of the reverse compensation layer.

2. The laser radar athermal optical receiving device according to claim 1, It is characterized in that The material of the reverse compensation movable ring is aluminum alloy, and the material of the reverse compensation layer is nylon.

3. The laser radar athermal optical receiving device according to claim 1, It is characterized in that One end of the main lens barrel seat away from the first lens is fixedly connected to the detection barrel seat, a third lens is arranged inside the detection barrel seat, and the rear lens barrel seat can move relative to the detection barrel seat along the axial direction of the rear lens barrel seat.

4. The laser radar athermal optical receiving device according to claim 3, It is characterized in that An opening is radially formed at one end of the detection tube seat close to the second lens, the opening is located between the second lens and the third lens, and a filter assembly is installed in the opening.

5. The laser radar athermal optical receiving device according to claim 4, It is characterized in that The optical filter assembly comprises an optical filter and a lens frame, wherein the optical filter is installed in the lens frame, and the lens frame is clamped in the opening.

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