Receiving lens and laser rangefinder

Abstract

The present invention provides a receiving objective lens and a laser rangefinder, and relates to the technical field of laser rangefinders. The receiving objective lens can continuously project the reflected light of a close-range measurement target point onto a photoelectric receiver by combining an objective lens body, a first compensation lens, and a second compensation lens. When the distance between the measurement target and the receiving objective lens is relatively close, the reflected measurement light can be projected onto the photoelectric receiver under the action of the first compensation lens and the second compensation lens. Since the reflected measurement light of a target farther away from the close-range is relatively weak, and the energy gathered by the second curved surface of the first compensation lens is relatively strong, the reflected measurement light of a target closer to the close-range is relatively strong, but the energy gathered by the third curved surface is relatively weak, thus arranging the first compensation lens and the second compensation lens in close-range measurement can make the reflected light of the close-range target converge onto the photoelectric receiver both continuously and evenly, and can ensure the measurement quality of close-range measurement. This is an innovative technology.

Description

Technical Field

[0001] The present invention relates to the technical field of laser rangefinders, and in particular to a receiving objective lens and a laser rangefinder. Background Art

[0002] Laser distance meters are widely used in engineering measurement, construction measurement, and home decoration. Commonly used handheld laser distance meters are generally based on the principle of phase measurement. The measurement distance of such distance meters ranges from a few millimeters to hundreds of meters, and the measurement accuracy is above millimeters.

[0003] like Figure 1 The typical laser rangefinder optical system in the prior art shown includes a laser emitting light source 1, a collimating objective lens 2, a measuring target 3, a receiving objective lens 4, a photoelectric receiver 5, a light source adjustment circuit 6, a control unit 7, and a measurement result display unit 8.

[0004] The optical axes of the collimating lens 2 and the receiving lens 4 are parallel, and the light receiving surface of the light receiver 5 is located at the focus of the receiving lens 4. In addition, there is an inner optical path in the transmitting optical path and the receiving optical path to compensate for the drift error generated in the circuit.

[0005] When measuring a distant target 3, the reflected light is incident on the receiving lens 4 as parallel light, and then converges at the focus of the receiving lens 4, i.e., the receiving surface of the photoelectric receiver 5. When measuring a close distance, the reflected light reflected from the target 3 is incident on the receiving lens 4 as off-axis light, and there is an angle with the optical axis of the receiving lens 4, so the image is deviated from the focus of the receiving lens 4, so that the photoelectric receiver cannot receive the incident reflected measurement light, so the measurement cannot be carried out and no data is displayed. Summary of the invention

[0006] The object of the present invention is to provide a receiving objective lens and a laser rangefinder to solve the technical problem that the existing laser rangefinder cannot accurately measure the distance at a close distance or cannot measure the distance.

[0007] In a first aspect, an embodiment of the present invention provides a receiving objective lens, the receiving objective lens comprising: an objective lens body, the objective lens body comprising a first light incident surface and a first light emitting surface arranged at intervals along a light incident side toward a light emitting side, the first light incident surface comprising a first curved surface convex toward the light incident side;

[0008] A first compensation lens and a second compensation lens are disposed on the first light exiting surface, the first compensation lens includes a second light incident surface and a second light exiting surface, the second compensation lens includes a third light incident surface and a third light exiting surface, and the second light incident surface and the third light incident surface are both in contact with the first light exiting surface;

[0009] The second light-emitting surface comprises a second curved surface convex toward the light-emitting side, and the optical axis of the second curved surface is inclined toward the direction of the optical axis of the objective lens body along the direction from the light-entering side to the light-exiting side, and the second curved surface is used to converge the first incident light irradiated on the first light-entering surface, so that at least a part of the light spot of the output light of the first incident light falls on the receiving surface, and the angle between the first incident light and the optical axis of the objective lens body is within a first angle range;

[0010] The third light-emitting surface is a third curved surface that is recessed toward the light-entering side. Along the direction from the light-entering side to the light-emitting side, the optical axis of the third curved surface is inclined toward the direction where the optical axis of the objective lens body is located. The third curved surface is used to diverge the second incident light irradiated on the first light-entering surface, so that at least a part of the light spot of the outgoing light of the second incident light falls within the receiving surface; the angle between the second incident light and the optical axis of the objective lens body is within a second angle range, and the minimum value of the second angle range is equal to the maximum value of the first angle range;

[0011] The receiving surface is perpendicular to the optical axis of the objective lens body and is located at the focus of the light-emitting side of the objective lens body.

[0012] Furthermore, the first compensation lens is a spherical lens; and the second compensation lens is a cylindrical lens.

[0013] In a second aspect, an embodiment of the present invention provides a laser rangefinder, wherein the laser rangefinder includes the above-mentioned receiving objective lens.

[0014] Furthermore, the laser rangefinder further comprises a laser emitting light source, a collimating lens and a photoelectric receiver, wherein the collimating lens is used to receive light emitted by the laser emitting light source and converge it onto the measurement target;

[0015] The receiving objective lens is used to receive light reflected by the measurement target, and the photoelectric receiver is located at the focus of the light-emitting side of the objective lens body.

[0016] Furthermore, the optical axis of the collimating objective lens and the optical axis of the receiving objective lens are parallel to each other along a first direction and are spaced apart from each other;

[0017] The distance between the optical axis of the collimating objective lens and the optical axis of the receiving objective lens is 8 mm to 16 mm.

[0018] Furthermore, the second compensation lens is a cylindrical lens, and the distance between the center of the projection of the first compensation lens on the first light-emitting surface and the optical axis position of the first light-emitting surface is equal to the distance between the center of the projection of the second compensation lens on the first light-emitting surface and the optical axis position of the first light-emitting surface.

[0019] Furthermore, a positioning circle is formed with the optical axis position of the first light-emitting surface as the center of the circle and the distance between the center of the projection of the first compensation lens on the first light-emitting surface and the optical axis position of the first light-emitting surface as the radius, the center of the projection of the second compensation lens on the first light-emitting surface is on the positioning circle, and the size of the projection of the second compensation lens on the first light-emitting surface is 3 mm*2 mm, and the cylindrical direction of the second compensation lens is parallel to the radial direction of the positioning circle.

[0020] Furthermore, an angle formed by a line between a center of a projection of the first compensation lens on the first light-emitting surface and the optical axis position of the first light-emitting surface and a line between a center of a projection of the second compensation lens on the first light-emitting surface and the optical axis position of the first light-emitting surface is 80°-90°.

[0021] Furthermore, the focal length of the first curved surface is 40 mm-45 mm, the radius of curvature of the second curved surface is 120 mm-140 mm, and the radius of curvature of the third curved surface is 50 mm-70 mm.

[0022] Furthermore, the distances between the optical axis of the second curved surface and the optical axis of the third curved surface and the optical axis of the objective lens body are 3 mm to 5 mm respectively.

[0023] The receiving objective lens provided by the embodiment of the present invention comprises: an objective lens body, the objective lens body comprises a first light incident surface and a first light emitting surface arranged at intervals along the direction from the light incident side to the light emitting side, the first light incident surface comprises a first curved surface convex toward the light incident side; a first compensation lens and a second compensation lens are arranged on the first light emitting surface, the first compensation lens comprises a second light incident surface and a second light emitting surface, the second compensation lens comprises a third light incident surface and a third light emitting surface, the second light incident surface and the third light incident surface are both in contact with the first light emitting surface; the second light emitting surface comprises a second curved surface convex toward the light emitting side, and along the direction from the light incident side to the light emitting side, the optical axis of the second curved surface is inclined toward the direction where the optical axis of the objective lens body is located, and the second curved surface is used to converge the first incident light irradiated on the first light incident surface , so that at least a part of the light spot of the outgoing light of the first incident light falls on the receiving surface, and the angle between the first incident light and the optical axis of the objective lens body is within a first angle range; the third light-exiting surface is a third curved surface recessed toward the light-entering side, and along the direction from the light-entering side to the light-exiting side, the optical axis of the third curved surface is inclined toward the direction of the optical axis of the objective lens body, and the third curved surface is used to diverge the second incident light irradiated on the first light-entering surface, so that at least a part of the light spot of the outgoing light of the second incident light falls on the receiving surface; the angle between the second incident light and the optical axis of the objective lens body is within a second angle range, and the minimum value of the second angle range is equal to the maximum value of the first angle range; the receiving surface is perpendicular to the optical axis of the objective lens body, and is located at the focus of the light-exiting side of the objective lens body. The transmission principle of the objective lens is as follows: when the target is relatively far away from the receiving objective lens, the reflected measuring light is incident on the first incident surface of the objective lens body as approximately parallel light, and can be focused on the photoelectric receiver at the receiving surface; when the distance between the measuring target and the receiving objective lens is shortened, the angle between the reflected measuring light and the optical axis of the objective lens body gradually increases to within the first angle range, and the first light incident surface cannot converge the reflected measuring light to the photoelectric receiver because the optical axis of the second curved surface is inclined to the optical axis of the objective lens body, and the reflected measuring light can be directed to the photoelectric receiver at the receiving surface under the action of the second curved surface; when the distance between the measuring target and the receiving objective lens continues to shorten, the angle between the reflected measuring light and the optical axis of the objective lens body gradually increases to within the second angle range, and it is difficult to project the light to the photoelectric receiver by relying on the convergence effect, so the third curved surface is used to expand the light spot by utilizing the divergence principle of the third curved surface, thereby projecting the reflected measuring light to the photoelectric receiver.This method of combining the objective lens body, the first compensation lens and the second compensation lens can make the reflected light of the close-range measurement target point continuously projected onto the photoelectric receiver. Since the reflected measurement light of the target farther away is relatively weak, and the energy gathered by the second curved surface is relatively strong, the reflected measurement light of the target closer to the close distance is relatively strong, but the energy gathered by the third curved surface is relatively small, so in the close-range measurement, the first compensation lens and the second compensation lens are cleverly and accurately set, so that the reflected light of the close-range target can be gathered onto the photoelectric receiver continuously and evenly, and the measurement quality of the close-range measurement can be successfully guaranteed. This is a first without precedent.

[0024] The laser rangefinder provided by the embodiment of the present invention includes the above-mentioned receiving objective lens. Since the laser rangefinder provided by the embodiment of the present invention uses the above-mentioned receiving objective lens, the laser rangefinder provided by the embodiment of the present invention also has the advantages of the receiving objective lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of a laser rangefinder in the prior art;

[0027] Figure 2 A schematic diagram of a receiving objective lens provided by an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Sectional view in the AA direction;

[0029] Figure 4 for Figure 2 Cross-sectional view in the BB direction;

[0030] Figure 5 A schematic diagram of a laser rangefinder provided by an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a first compensation lens of a laser rangefinder provided by an embodiment of the present invention;

[0032] Figure 7 for Figure 6 The light spot display diagram on the photoelectric receiver;

[0033] Figure 8 A schematic diagram of a second compensation lens of a laser rangefinder provided by an embodiment of the present invention;

[0034] Fig. 9 for Figure 8 The light spot display on the photoelectric receiver in the figure.

[0035] Icon: 1-laser emitting light source; 2-collimating objective lens; 3-measurement target; 4-receiving objective lens; 5-photoelectric receiver; 6-regulating circuit; 7-control unit; 8-display unit;

[0036] 100 - objective lens body; 110 - first curved surface; 200 - first compensation lens; 210 - second curved surface; 300 - second compensation lens; 310 - third curved surface; 400 - receiving surface; 510 - second light spot; 520 - third light spot. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The receiving objective lens 4 provided in the embodiment of the present invention is used to be installed in the receiving optical path of the laser distance measurement, and is used to converge the emitted measuring light onto the receiving surface 400 of the photoelectric receiver 5 .

[0039] like Figure 2-Figure 4 As shown, the receiving objective lens 4 includes: an objective lens body 100, the objective lens body 100 includes a first light incident surface and a first light emitting surface arranged at intervals along the light incident side toward the light emitting side, the first light incident surface includes a first curved surface 110 convex toward the light incident side, the first curved surface 110 has a convergence function, and the first curved surface 110 can be an aspherical structure. The first light emitting surface can be a plane perpendicular to the optical axis of the objective lens body 100.

[0040] A first compensation lens 200 and a second compensation lens 300 are arranged on the first light-emitting surface. The first compensation lens 200 and the second compensation lens 300 can both be located in the lower half of the objective lens body 100. In the laser rangefinder, the first compensation lens 200 and the second compensation lens 300 are specifically located on a side close to the emission optical axis and are spaced apart in the left-right direction.

[0041] The first compensating lens 200 includes a second light incident surface and a second light emitting surface, and the second compensating lens 300 includes a third light incident surface and a third light emitting surface, and the second light incident surface and the third light incident surface are both bonded to the first light emitting surface. The second light incident surface and the third light incident surface can be connected to the first light emitting surface by gluing. In other embodiments, the objective lens body 100, the first compensating lens 200 and the second compensating lens 300 can be an integrated structure, and there is no seam between the second light incident surface and the third light incident surface and the first light emitting surface respectively.

[0042] The second light emitting surface includes a second curved surface 210 convex toward the light emitting side, and the optical axis of the second curved surface 210 is inclined to the optical axis of the objective lens body 100, that is, along the light incident side to the light emitting side, the optical axis of the second curved surface 210 is inclined toward the optical axis direction of the objective lens body 100, and the second curved surface 210 is used to converge the first incident light irradiated on the first light incident surface, so that at least a part of the light spot of the output light of the first incident light falls on the receiving surface 400, and the angle between the first incident light and the optical axis of the objective lens body 100 is within a first angle range.

[0043] The third light emitting surface is a third curved surface 310 recessed toward the light incident side, and the optical axis of the third curved surface 310 is inclined with respect to the optical axis of the objective lens body 100, that is, along the light incident side toward the light emitting side, the optical axis of the third curved surface 310 is inclined with respect to the optical axis direction of the objective lens body 100, and the third curved surface 310 is used for diverging the second incident light irradiated on the first light incident surface, so that at least a part of the light spot of the output light of the second incident light falls within the receiving surface 400; the angle between the second incident light and the optical axis of the objective lens body 100 is within a second angle range.

[0044] The minimum value of the second angle range is equal to the maximum value of the first angle range, so that the measurement can be performed continuously and the generation of null points (distance that cannot be measured) is avoided.

[0045] The receiving surface 400 is perpendicular to the optical axis of the objective lens body 100 and is located at the focus of the light-emitting side of the objective lens body 100, and is used to collect the light emitted by the receiving objective lens 4. Only when the light emitted by the receiving objective lens 4 is projected into the range of the receiving surface 400, the photoelectric receiver 5 can measure the distance.

[0046] like Figure 5As shown in FIG. 1 , the transmission principle of the objective lens is as follows: when the target is far away from the receiving objective lens 4, the reflected measurement light is incident on the first incident surface of the objective lens body 100 as approximately parallel light, and can be focused on the photoelectric receiver 5 at the receiving surface 400 to form a first light spot; and when the distance between the measurement target 3 and the receiving objective lens 4 is shortened, for example, shortened to 2 meters to 8 meters, the angle between the reflected measurement light and the optical axis of the objective lens body 100 gradually increases to within the first angle range (A1-A2), and the first light incident surface cannot converge the reflected measurement light to the photoelectric receiver, because the optical axis of the second curved surface 210 is inclined to the optical axis of the objective lens body 100. The reflected measuring light can be directed toward the photoelectric receiver 5 at the receiving surface 400 under the action of the second curved surface 210, and form a second light spot 510; and when the distance between the measuring target 3 and the receiving objective lens 4 continues to shorten, for example, shortened to 0.1 meters to 2 meters, the angle between the reflected measuring light and the optical axis of the objective lens body 100 gradually increases to within the second angle range (A2-A3), and it is difficult to project the light spot to the photoelectric receiver 5 by relying on the convergence effect. Therefore, the third curved surface 310 is adopted to expand the light spot by utilizing the principle of divergence of the cylindrical mirror, so as to project the reflected measuring light onto the photoelectric receiver 5, and form a third light spot 520. This method of combining the objective lens body 100, the first compensation lens 200 and the second compensation lens 300 can make the reflected light of three points of the close-range measurement target continuously projected onto the photoelectric receiver 5. Since the reflected measurement light of the target farther away is relatively weak, and the second curved surface 210 has a stronger ability to converge, and the reflected measurement light of the target closer to the close distance is relatively strong, but the energy converged by the third curved surface 310 is relatively weak, thus arranging the first compensation lens 200 and the second compensation lens 300 in the close-range measurement can make the reflected light of the close-range target converge onto the photoelectric receiver 5 continuously and evenly, and can ensure the measurement quality of the close-range measurement.

[0047] The geometric positions and curvature radii of the second curved surface 210 of the first compensation lens 200 and the third curved surface 310 of the second compensation lens 300 on the objective lens body 100 are respectively determined by the rangefinder structure, the parameters of the first curved surface 110 and the distance between the transmitting optical axis and the receiving optical axis.

[0048] The first compensation lens 200 may be a spherical lens. The second compensation lens 300 may be a cylindrical lens. The cross section of the third curved surface 310 on the cylindrical lens is a curve. After the measured reflected light passes through the first curved surface 110 and the third curved surface 310 successively, it is projected onto the photoelectric receiver 5 in a fan-shaped beam. Compared with a conventional concave mirror, the cylindrical lens has a better energy focusing effect.

[0049] like Figure 5-Figure 9As shown, the laser rangefinder provided in the embodiment of the present invention includes the above-mentioned receiving objective lens 4. Since the laser rangefinder provided in the embodiment of the present invention uses the above-mentioned receiving objective lens 4, the laser rangefinder provided in the embodiment of the present invention also has the advantages of the receiving objective lens 4.

[0050] The laser rangefinder further includes a laser emitting light source 1, a collimating lens 2 and a photoelectric receiver 5. The laser emitting light source 1 is used to emit measurement light, the collimating lens 2 is used to receive the light emitted by the laser emitting light source 1 and converge it onto the measurement target 3, the measurement target 3 reflects the measurement light, the receiving lens 4 is used to receive the light reflected by the measurement target 3, and the photoelectric receiver 5 is located at the focus of the light emitting side of the lens body 100.

[0051] The optical axis of the collimating objective lens 2 and the optical axis of the receiving objective lens 4 are parallel to each other along a first direction and are spaced apart from each other. The first compensation lens 200 and the second compensation lens 300 may be located on a side of the objective lens body 100 close to the collimating objective lens 2 .

[0052] The distance between the optical axis of the collimating objective lens 2 and the optical axis of the receiving objective lens 4 may be 8 mm to 16 mm.

[0053] The second compensating lens 300 may be a cylindrical lens, which has a better energy focusing effect than a conventional concave mirror. The distance between the center of the projection of the first compensating lens 200 on the first light exit surface and the optical axis position of the first light exit surface and the distance between the center of the projection of the second compensating lens 300 on the first light exit surface and the optical axis position of the first light exit surface may be equal.

[0054] A positioning circle is formed with the optical axis position of the first light exiting surface as the center of the circle and the distance between the center of the projection of the first compensating lens 200 on the first light exiting surface and the optical axis position of the first light exiting surface as the radius. The center of the projection of the second compensating lens 300 on the first light exiting surface may be on the positioning circle, and the projection of the second compensating lens on the first light exiting surface is a rectangle with a size of 3 mm*2 mm. The cylindrical direction of the second compensating lens may be parallel to the radial direction of the positioning circle.

[0055] The angle formed by the line between the center of the projection of the first compensation lens 200 on the first light exit surface and the optical axis position of the first light exit surface and the line between the center of the projection of the second compensation lens 300 on the first light exit surface and the optical axis position of the first light exit surface is 80-90°.

[0056] The angle between the line between the center of the projection of the first compensating lens 200 on the first light exit surface and the optical axis position of the first light exit surface and the vertical direction may be 40°-45°. The angle between the line between the center of the projection of the second compensating lens 300 on the first light exit surface and the optical axis position of the first light exit surface and the vertical direction may be 40°-45°.

[0057] The focal length of the first curved surface 110 is 40 mm to 45 mm. The radius of curvature of the second curved surface 210 is 120 mm to 140 mm. The radius of curvature of the third curved surface 310 is 50 mm to 70 mm.

[0058] The distances between the optical axis of the second curved surface 210 and the optical axis of the third curved surface 310 and the optical axis of the objective lens body 100 are 3 mm to 5 mm respectively.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A receiving objective lens, characterized in that: The receiving objective lens (4) comprises: an objective lens body (100), the objective lens body (100) comprising a first light incident surface and a first light emitting surface arranged at intervals along a direction from a light incident side toward a light emitting side, the first light incident surface comprising a first curved surface (110) convex toward the light incident side; A first compensation lens (200) and a second compensation lens (300) are arranged on the first light exiting surface, the first compensation lens (200) comprises a second light incident surface and a second light exiting surface, the second compensation lens (300) comprises a third light incident surface and a third light exiting surface, and the second light incident surface and the third light incident surface are both in contact with the first light exiting surface; The second light-emitting surface comprises a second curved surface (210) convex toward the light-emitting side, and along the direction from the light-entering side to the light-emitting side, the optical axis of the second curved surface (210) is inclined toward the direction where the optical axis of the objective lens body (100) is located, and the second curved surface (210) is used to converge the first incident light irradiated on the first light-entering surface, so that at least a part of the light spot of the outgoing light of the first incident light falls on the receiving surface (400), and the angle between the first incident light and the optical axis of the objective lens body (100) is within a first angle range; The third light-emitting surface is a third curved surface (310) that is recessed toward the light-entering side. Along the direction from the light-entering side to the light-emitting side, the optical axis of the third curved surface (310) is inclined toward the direction where the optical axis of the objective lens body (100) is located. The third curved surface (310) is used to diverge the second incident light irradiated on the first light-entering surface, so that at least a part of the light spot of the output light of the second incident light falls within the receiving surface (400); the angle between the second incident light and the optical axis of the objective lens body (100) is within a second angle range, and the minimum value of the second angle range is equal to the maximum value of the first angle range; The receiving surface (400) is perpendicular to the optical axis of the objective lens body (100) and is located at the focal point of the light-emitting side of the objective lens body (100).

2. The receiving objective lens according to claim 1, characterized in that: The first compensation lens (200) is a spherical lens; the second compensation lens (300) is a cylindrical lens.

3. A laser rangefinder, characterized in that: The laser rangefinder comprises the receiving objective lens (4) as claimed in claim 1 or 2.

4. The laser rangefinder according to claim 3, characterized in that: The laser rangefinder further comprises a laser emitting light source (1), a collimating lens (2) and a photoelectric receiver (5), wherein the collimating lens (2) is used to receive light emitted by the laser emitting light source (1) and converge the light onto a measurement target (3); The receiving objective lens (4) is used to receive light reflected by the measurement target (3), and the photoelectric receiver (5) is located at the focal point of the light-emitting side of the objective lens body (100).

5. The laser rangefinder according to claim 4, characterized in that: The optical axis of the collimating objective lens (2) and the optical axis of the receiving objective lens (4) are parallel to each other along a first direction and are spaced apart from each other; The distance between the optical axis of the collimating objective lens (2) and the optical axis of the receiving objective lens (4) is 8 mm to 16 mm.

6. The laser rangefinder according to claim 5, characterized in that: The second compensation lens (300) is a cylindrical lens, and the distance between the center of the projection of the first compensation lens (200) on the first light exit surface and the optical axis position of the first light exit surface is equal to the distance between the center of the projection of the second compensation lens (300) on the first light exit surface and the optical axis position of the first light exit surface.

7. The laser rangefinder according to claim 6, characterized in that: A positioning circle is formed with the optical axis position of the first light exiting surface as the center of the circle and the distance between the center of the projection of the first compensation lens (200) on the first light exiting surface and the optical axis position of the first light exiting surface as the radius, the center of the projection of the second compensation lens (300) on the first light exiting surface is on the positioning circle, and the size of the projection of the second compensation lens (300) on the first light exiting surface is 3 mm*2 mm, and the cylindrical direction of the second compensation lens (300) is parallel to the radial direction of the positioning circle.

8. The laser rangefinder according to claim 3, characterized in that: An angle formed by a line between a center of a projection of the first compensation lens (200) on the first light exit surface and an optical axis position of the first light exit surface and a line between a center of a projection of the second compensation lens (300) on the first light exit surface and an optical axis position of the first light exit surface is 80°-90°.

9. The laser rangefinder according to claim 3, characterized in that: The focal length of the first curved surface (110) is 40 mm to 45 mm, the radius of curvature of the second curved surface (210) is 120 mm to 140 mm, and the radius of curvature of the third curved surface (310) is 50 mm to 70 mm.

10. The laser rangefinder according to claim 3, characterized in that: The distances between the optical axis of the second curved surface (210) and the optical axis of the third curved surface (310) and the optical axis of the objective lens body (100) are 3 mm to 5 mm respectively.

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