Laser range finder

Abstract

The utility model discloses a laser range finder which comprises an objective lens unit, an ocular lens unit and a laser range finding unit. The objective lens unit comprises an objective lens group, a beam splitter prism group and a corrector; the corrector comprises a fixed seat and a movable seat, an assembly hole is formed in the center of the fixed seat, the movable seat is slidably assembled in the assembly hole, a plurality of electromagnetic coils are assembled on the fixed seat at intervals in the circumferential direction of the fixed seat, a magnet is assembled on the movable seat, and a correction lens is embedded in a middle hole of the movable seat. The correction lens can slide under the magnetic cooperation of the electromagnetic coil and the magnet so as to correct the imaging light path; the laser ranging unit comprises a transmitting assembly and a receiving assembly. The transmitting assembly comprises a laser transmitter and a transmitting lens. The receiving assembly comprises a laser receiver and a receiving lens, and a steering lens is further arranged between the laser receiver and the receiving lens. According to the utility model, through arranging the corrector, jitter correction can be carried out on an imaging light path so as to improve imaging definition and distance measurement accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of ranging technology, specifically relating to a laser rangefinder. Background Technology

[0002] Rangefinders enable observation and aiming at the object being measured, and can also display the distance to the object in real time. However, in actual use, handheld rangefinders can experience shaking and offset, leading to image deviation and affecting the accuracy of distance measurement. Furthermore, in existing rangefinders, the laser signal goes directly into the laser receiving module after passing through the objective lens group, making it impossible to adjust the focus of the laser. This limits the position of the laser ranging unit and makes it impossible to maintain the overall compactness of the rangefinder structure. Summary of the Invention

[0003] This utility model addresses the aforementioned technical problems by providing a laser rangefinder. The objective of this utility model is achieved through the following technical solution:

[0004] A laser rangefinder includes an objective lens unit, an eyepiece unit, and a laser ranging unit. The objective lens unit includes an objective lens group, a beam splitter prism group, and a corrector disposed between the objective lens group and the beam splitter prism group. The corrector includes a fixed base and a movable base. The fixed base has a central mounting hole, and the movable base is slidably mounted in the mounting hole via a guide shaft. Multiple electromagnetic coils are spaced apart along the circumference of the fixed base. A magnet that magnetically engages with the electromagnetic coils is mounted on the movable base. A correction lens is embedded in the central hole of the movable base. The correction lens can slide under the magnetic force of the electromagnetic coils and the magnet to correct the imaging optical path. The laser ranging unit includes a transmitting component and a receiving component. The transmitting component includes a laser emitter and a transmitting lens disposed between the laser emitter and the beam splitter prism group. The receiving component includes a laser receiver and a receiving lens, and a steering lens is further disposed between the laser receiver and the receiving lens.

[0005] Preferably, four electromagnetic coils and four magnets are provided, with each electromagnetic coil and magnet corresponding to another one. The four magnets are arranged in pairs facing each other, with the line connecting two magnets extending along a first direction and the line connecting the other two magnets extending along a second direction, and the first direction being perpendicular to the second direction.

[0006] Preferably, the eyepiece unit includes an eyepiece group and a display screen. The display screen and the eyepiece group are arranged sequentially along the visible light propagation direction and are located behind the beam splitter prism group. The objective lens group and the correction lens are arranged sequentially along the imaging light path and are located in front of the beam splitter prism group.

[0007] Preferably, the laser emitter and the emitting lens are disposed on the first optical path and located below the beam splitter prism group, and the first optical path is perpendicular to the imaging optical path.

[0008] Preferably, the receiving lens and the steering lens are disposed on the second optical path, and the second optical path is perpendicular to the first optical path.

[0009] Preferably, the laser receiver is disposed in the third optical path, and the third optical path is perpendicular to the second optical path.

[0010] Preferably, the objective lens group includes a cemented objective lens and a single objective lens, with the cemented objective lens positioned in front of the single objective lens.

[0011] Preferably, the eyepiece assembly includes a cemented eyepiece lens and a single eyepiece lens, with two single eyepiece lenses provided, and the cemented eyepiece lens is positioned in front of the single eyepiece lens.

[0012] Preferably, the emitting lens is a convex lens or a concave lens and is positioned directly below the beam splitter prism group.

[0013] Preferably, the steering lens is a plane mirror, and its setting angle is 45 degrees.

[0014] Compared with the prior art, this utility model has the following technical effects: by setting a corrector, the imaging optical path can be corrected, avoiding imaging offset caused by rangefinder jitter, thereby improving imaging clarity and ranging accuracy; the corrector structure is reasonably set and simple to operate. The magnetic force of the magnet and the electromagnetic coil can adjust the position of the correcting lens in two vertical directions to achieve precise focusing; by setting the emitting lens and the steering lens in the laser ranging unit, the convergence point of the laser signal can be adjusted, thereby removing the limitation on the position of the laser emitter and laser receiver, making adjustment more convenient, and further contributing to the compactness of the overall structure of the rangefinder. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the corrector structure in this utility model;

[0017] The following are labels in the diagram: beam splitter prism 11; cemented objective lens 121; single objective lens 122; corrector 20; mounting base 21; coil slot 211; moving base 22; corrector lens 23; display screen 31; cemented eyepiece lens 321; single eyepiece lens 322; laser emitter 41; emitting lens 42; receiving lens 43; laser receiver 44; steering lens 45. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0019] See Figures 1-2This utility model discloses a laser rangefinder, which includes an objective lens unit, an eyepiece unit, and a laser rangefinder unit.

[0020] The objective lens unit includes an objective lens group, a beam splitter 11 group, and a corrector 20 disposed between the objective lens group and the beam splitter 11 group. The corrector 20 includes a fixed base 21 and a movable base 22. The fixed base 21 has a central mounting hole, and the movable base 22 is slidably mounted in the mounting hole via a guide shaft. The fixed base 21 is circumferentially fitted with multiple electromagnetic coils, and the movable base 22 is fitted with a magnet that magnetically engages with the electromagnetic coils. A corrector lens 23 is embedded in the central hole of the movable base 22. The corrector lens 23 can slide under the magnetic force of the electromagnetic coils and the magnet to correct the imaging optical path, avoiding imaging shift caused by rangefinder jitter, thereby improving imaging clarity and ranging accuracy. Four electromagnetic coils and four magnets are provided, with each electromagnetic coil and magnet corresponding to the other. The mounting base 21 is provided with a coil slot 211 for assembling the electromagnetic coils. The four magnets are arranged in pairs facing each other, with the line connecting two magnets extending along a first direction and the line connecting the other two magnets extending along a second direction. The first direction is perpendicular to the second direction. The corrector has a reasonable structure and is easy to operate. The magnetic force of the magnets and the electromagnetic coils can adjust the position of the correcting lens 23 in two vertical directions to achieve precise focusing.

[0021] The eyepiece unit includes an eyepiece group and a display screen 31. The display screen 31 and the eyepiece group are arranged sequentially along the visible light propagation direction and are located behind the beam splitter 11 group. The eyepiece group includes an eyepiece cemented lens 321 and an eyepiece single lens 322. There are two eyepiece single lenses 322, and the eyepiece cemented lens 321 is arranged in front of the eyepiece single lens 322. The eyepiece cemented lens 321 is used to diverge and amplify the distance information, and the eyepiece single lens 322 is used to converge the diverged and amplified distance information.

[0022] The objective lens group and the correction lens 23 are arranged sequentially in the imaging optical path and are located in front of the beam splitter 11 group; the objective lens group includes an objective lens cementing lens 121 and an objective lens 122, and the objective lens cementing lens 121 is arranged in front of the objective lens 122.

[0023] The laser emitter 41 and emitting lens 42 are disposed on the first optical path and located below the beam splitter 11 group, with the first optical path perpendicular to the imaging optical path. The receiving lens 43 and steering lens 45 are disposed on the second optical path, with the second optical path perpendicular to the first optical path. The laser receiver 44 is disposed on the third optical path, with the third optical path perpendicular to the second optical path. The emitting lens 42 is a convex lens and is disposed directly below the beam splitter 11 group. The steering lens 45 is a plane mirror with a 45-degree angle. By setting the emitting lens 42 and steering lens 45 in the laser ranging unit and reasonably setting the positions of each optical component, the focal point of the laser signal can be adjusted, thereby removing the restriction on the positions of the laser emitter 41 and laser receiver 44, making adjustment more convenient, and contributing to the compactness of the overall structure of the rangefinder.

[0024] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open-ended meaning, that is, equivalent to "at least comprising...", and should not be understood as having a closed-ended meaning, that is, its meaning should not be understood as "only comprising...". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0025] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model should be included within the protection scope of this utility model.

Claims

1. A laser range finder comprising an objective lens unit, an ocular lens unit, and a laser range finding unit; characterized by, The objective lens unit comprises an objective lens group, a light splitting prism group, and a corrector arranged between the objective lens group and the light splitting prism group; the corrector comprises a fixed seat and a moving seat, the fixed seat is centrally provided with an assembly hole, the moving seat is slidingly assembled in the assembly hole through a guide shaft, a plurality of electromagnetic coils are arranged on the fixed seat at intervals in the circumferential direction, a magnet is arranged on the moving seat and magnetically cooperates with the electromagnetic coils, a correction lens is embedded on the moving seat and can slide under the magnetic cooperation of the electromagnetic coils and the magnet to compensate and correct the imaging light path; the laser ranging unit comprises a transmitting assembly and a receiving assembly, the transmitting assembly comprises a laser transmitter and a transmitting lens arranged between the laser transmitter and the light splitting prism group; the receiving assembly comprises a laser receiver and a receiving lens, and a turning lens is further arranged between the laser receiver and the receiving lens.

2. A laser range finder according to claim 1, wherein, The electromagnetic coils and the magnets are both provided with four, the electromagnetic coils and the magnets one-to-one correspond and cooperate, the four magnets are oppositely arranged in pairs, the connecting lines of the two magnets extend in a first direction, the connecting lines of the other two magnets extend in a second direction, and the first direction is perpendicular to the second direction.

3. A laser range finder according to claim 1, wherein, The eyepiece unit comprises an eyepiece group and a display screen, the display screen and the eyepiece group are sequentially arranged on the visible light path in the propagation direction of visible light and are located behind the light splitting prism group; the objective lens group and the correction lens are sequentially arranged on the imaging light path and are located in front of the light splitting prism group.

4. A laser range finder according to claim 3, wherein, The laser transmitter and the transmitting lens are arranged on a first light path and are located below the light splitting prism group, and the first light path is perpendicular to the imaging light path.

5. A laser range finder according to claim 4, wherein, The receiving lens and the turning lens are arranged on a second light path, and the second light path is perpendicular to the first light path.

6. A laser range finder according to claim 5, wherein, The laser receiver is arranged on a third light path, and the third light path is perpendicular to the second light path.

7. A laser rangefinder according to any one of claims 1 to 6, characterized in that The objective lens group comprises an objective lens cemented lens and an objective lens single lens, and the objective lens cemented lens is arranged in front of the objective lens single lens.

8. A laser range finder according to any one of claims 3 to 6, wherein, The eyepiece group comprises an eyepiece cemented lens and two eyepiece single lenses, and the eyepiece cemented lens is arranged in front of the eyepiece single lenses.

9. The laser range finder of claim 1, wherein, The transmitting lens is a convex lens or a concave lens and is arranged directly below the light splitting prism group.

10. A laser range finder according to claim 9, wherein, The turning lens is a plane mirror, and the setting angle thereof is 45 degrees.

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