CN216816931U

CN216816931U - Laser range finder

Info

Publication number: CN216816931U
Application number: CN202220259994.9U
Authority: CN
Inventors: 王振兴
Original assignee: Shenzhen Changmaoxiang Electronics Co ltd
Current assignee: Shenzhen Changmaoxiang Electronics Co ltd
Priority date: 2021-12-01
Filing date: 2022-02-08
Publication date: 2022-06-24
Anticipated expiration: 2032-02-08

Abstract

A laser range finder comprises a light path base main body, a PCB (printed Circuit Board), a transmitting light path and a receiving light path, wherein a pendulum body is arranged on a shell of the light path base main body, and a light path element on the transmitting light path or the receiving light path is arranged in the center of the pendulum body; the shell of the optical path base main body is provided with a pendulum bearing hole matched with the pendulum body, and the installation angle of the optical path element is slightly changed by adjusting the pendulum body to slightly swing in the pendulum bearing hole, so that the angle of an optical axis is slightly adjusted, and the transmitting optical path and the receiving optical path are kept coaxial.

Description

Laser range finder

Technical Field

The utility model relates to the technical field of laser measurement, in particular to a laser range finder.

Background

A laser distance measuring device is a device for accurately measuring the distance to a target (also called laser distance measurement) by using laser light. The laser range finder has the advantages of simple operation, high measurement precision, long working distance, strong anti-interference capability and the like, and is widely applied to military and civil use. A laser range finder typically includes a laser emitting system and a laser receiving system, with two separate optical systems each having a respective optical axis. When the laser distance measuring instrument works, firstly, a laser emitting system is used for emitting a laser beam to a measured target, and scattered laser echoes are received by a laser receiving system, so that the distance between the measured target and an observation point is determined by using measurement parameters such as light speed, time difference and the like. Therefore, the optical axis precision of the transmitting optical axis and the receiving optical axis has a very critical influence on the accuracy of the laser ranging. The existing laser distance measuring instrument on the market is difficult to realize optical axis adjustment by adopting fixed connection between the transmitting optical axis and the receiving optical axis and the machine body, and at the moment, the incident light path of the optical lens often deviates from the target center of the machine body, so that accurate coincidence is difficult to realize. Particularly, when a distance measurement is performed on a distant target, a positioning error of the optical axis is further amplified, which seriously affects the distance measurement accuracy.

The laser ranging sensor is realized by that a transmitting module emits light, a receiving module receives the light, and the ranging function is realized by a TOF time measuring method. In the laser ranging sensor assembling and adjusting process, precise adjustment is needed to ensure the transmitting and receiving precision.

Currently, the common adjusting method is to adjust the laser module or adjust the laser distance measuring sensor. For example, patent document CN202020464067.1 discloses an automatic receiving adjustment device for a laser ranging sensor, which includes: the device comprises a three-dimensional electric displacement table, a controller, a receiving circuit board, a transmitting fixing frame, a transmitting plate, a supporting base and a detection surface; the receiving circuit board is provided with a receiving detector, a fixing surface of the three-dimensional electric displacement table is provided with a receiving circuit board bracket, and the three-dimensional electric displacement table is used for driving the receiving circuit board to move in the X direction, the Y direction or the Z direction; the transmitting fixing frame is arranged on the transmitting plate, a transmitting light source and a receiving lens are arranged on the transmitting plate, and the transmitting plate is fixed on the supporting base; the detection surface is arranged right in front of the emission fixing frame and is vertical to the optical axis of the receiving lens; the controller is used for adjusting the three-dimensional electric displacement table, completing the movement of the receiving circuit board and realizing the adjustment and fixation of the receiving part of the laser ranging sensor. The three-dimensional electric displacement platform is respectively connected with three motors in the X direction, the Y direction or the Z direction, and the motors are used for driving the receiving circuit board to move in the X direction, the Y direction or the Z direction. Be provided with 4 reference columns and 4 mounting holes on three-dimensional electronic displacement platform's the installation face, receiving circuit board support is rectangular planar structure, receiving circuit board support's one end is provided with the concave groove, receiving circuit board support's the other end is provided with 8 holes, wherein 4 holes with 4 reference columns of three-dimensional electronic displacement platform correspond the setting, 4 holes in addition with 4 mounting holes of three-dimensional electronic displacement platform correspond the setting. The launching fixing frame is a concave structure which rotates by 90 degrees, the lower surface and the bottom surface of the launching fixing frame are horizontal planes, the side surface of the launching fixing frame is a vertical surface, and two threaded holes are formed in the top end of the launching fixing frame. The edge of receiving circuit board is provided with 4 through-hole pads, be provided with 4 welding copper posts on the transmitting plate, 4 through-hole pads of receiving circuit board with 4 welding copper posts of transmitting plate correspond the setting. The three-dimensional electric displacement platform with the transmission mount sets up on the support base, the expelling plate sets up in the transmission mount, receive circuit board support with the mesa of three-dimensional electric displacement platform is connected, receive circuit board sets up receive circuit board support's the other end, receive circuit board support sets up the rear of transmission mount, receive circuit board support with transmission mount parallel arrangement, 4 welding copper posts of expelling plate set up in 4 through-hole pads of receive circuit board, the detection face sets up the dead ahead of transmission mount, the detection face with the distance of transmission mount is greater than 10 meters, the detection face with the optical axis of the receiving lens that sets up on the expelling plate is perpendicular. Optionally, the controller is connected to a motor on the three-dimensional electric displacement platform, and is configured to control the receiving circuit board to move in an X direction, a Y direction, or a Z direction; the controller is in communication connection with the receiving circuit board and is used for collecting the receiving data of the receiving circuit board in real time for analysis and controlling the movement of the three-dimensional electric displacement platform according to the receiving data.

Patent document with application number CN201810266203.3 discloses a laser rangefinder system, including transmission light path and receiving light path, the transmission light path is provided with the laser instrument, the receiving light path is provided with signal reception processing apparatus, still be provided with the FSM speculum on the transmission light path, laser rangefinder system still includes piezoelectricity pendulum platform, piezoelectricity pendulum bench subsides are equipped with the FSM speculum is used for control the transmission direction of transmission light is adjusted to the FSM speculum.

The inventor finds that the fine adjustment of the optical axis is completed through electric control, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a laser range finder, which realizes fine adjustment of an optical axis by a manual control method.

The technical scheme adopted by the utility model is as follows: a laser range finder comprises a light path base main body, a PCB (printed circuit board), a transmitting light path and a receiving light path, wherein a pendulum body is arranged on a shell of the light path base main body, and a light path element on the transmitting light path or the receiving light path is arranged at the center of the pendulum body; the shell of the optical path base main body is provided with a pendulum bearing hole matched with the pendulum body, and the installation angle of the optical path element is slightly changed by adjusting the pendulum body to slightly swing in the pendulum bearing hole, so that the angle of an optical axis is slightly adjusted, and the transmitting optical path and the receiving optical path are coaxial.

The optical path elements include, but are not limited to, a diode for emitting laser light, a collimating lens and a laser emitting mirror for focusing the emitted laser light on an emission optical path, and a receiving collimating lens and a laser receiving mirror for receiving the focused emitted laser light on a receiving optical path.

Further, the emission light path sequentially comprises a diode for emitting laser light and an emission collimating lens for focusing the emission laser light; the receiving light path sequentially comprises a receiving collimating lens, a receiving laser mirror and a photoelectric sensor for receiving emitted light; the laser range finder also comprises a pendulum body, and a pendulum bearing hole matched with the pendulum body is formed in a shell of a light path base main body of the laser range finder, so that the pendulum body can freely and slightly swing in the pendulum bearing hole; the emission collimating lens is fixed at the center of the pendulum body, and the position of the emission collimating lens is adjusted by adjusting the position of the pendulum body, so that the optical axis of emitted laser is adjusted.

Furthermore, the laser range finder also comprises a second pendulum body, and a second pendulum bearing hole matched with the second pendulum body is formed in the shell of the light path base main body of the laser range finder, so that the second pendulum body can freely and slightly swing in the second pendulum bearing hole; the laser receiving reflector is fixed at the center of the second pendulum body, and the position of the laser receiving reflector is adjusted by adjusting the position of the second pendulum body, so that the optical axis of the received laser is adjusted.

Further, the pendulum body comprises a displacement plate for fixing the emission collimation lens and a spherical shell-shaped convex edge matched with the pendulum bearing hole, and the spherical shell-shaped convex edge can slightly swing in the pendulum bearing hole; the displacement plate is provided with at least three adjusting holes, and each adjusting hole is provided with a matched adjusting screw rod and a matched thread; the shell of the light path base main body is provided with a mounting hole matched with the adjusting hole, and the pendulum body and the shell of the light path base main body are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; and the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod.

Further, the second pendulum body comprises a displacement plate for fixing the laser receiving reflector and a spherical shell-shaped convex edge matched with the second pendulum bearing hole, and the spherical shell-shaped convex edge can slightly swing in the second pendulum bearing hole; the displacement plate is provided with at least three adjusting holes, and each adjusting hole is provided with a matched adjusting screw rod and a matched thread; the shell of the light path base main body is provided with a mounting hole matched with the adjusting hole, and the pendulum body and the shell of the light path base main body are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; and the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod.

Further, the receiving light path at least comprises a filter used for filtering non-emitted light wavelength.

Furthermore, an annular soft rubber ring or a spring is arranged between the adjusting hole and the shell and used for resetting the position of the pendulum body.

The utility model has the beneficial effects that: the utility model skillfully sets the pendulum body to finely adjust the laser optical axis in real time, quickly and accurately calibrate the laser receiving and transmitting optical axis, avoids the regular factory return adjustment of a distance measuring system, improves the continuous working time and environmental adaptability of the distance measuring machine, and provides guarantee for the realization of distance measuring performance and distance measuring precision.

Drawings

FIG. 1 is a schematic exploded view of the structure of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG. 3 is a schematic diagram of the optical path of an embodiment of the present invention;

FIG. 4 is a schematic diagram of the connection between the pendulum and the pendulum hole on the housing of the optical circuit base main body according to the embodiment of the present invention;

FIG. 5 is a schematic exploded view of the pendulum structure according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a pendulum according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a pendulum hole on a housing of an optical circuit base main body according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, an optical axis fine-tuning method for a laser range finder includes a light path base body, a PCB, a transmitting light path and a receiving light path, and includes the following steps:

installing an optical path element on the transmitting optical path or the receiving optical path at the center of the pendulum body; the shell of the optical path base main body is provided with a pendulum bearing hole matched with the pendulum body, and the installation angle of the optical path element is slightly changed by adjusting the pendulum body to slightly swing in the pendulum bearing hole, so that the angle of an optical axis is slightly adjusted, and the transmitting optical path and the receiving optical path are coaxial.

Further, the optical path elements include, but are not limited to, a diode for emitting laser light, a collimating lens and a laser emitting mirror for focusing the emitted laser light on an emission optical path, and a receiving collimating lens and a laser receiving mirror for receiving the focused emitted laser light on a receiving optical path.

Further, the pendulum body comprises a displacement plate for fixing the optical path element and a spherical shell-shaped convex edge matched with the pendulum bearing hole, and the spherical shell-shaped convex edge can slightly swing in the pendulum bearing hole; the displacement plate is provided with at least three adjusting holes, and each adjusting hole is provided with a matched adjusting screw rod and a matched thread; the shell of the light path base main body is provided with a mounting hole matched with the adjusting hole, and the pendulum body and the shell of the light path base main body are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; and the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, a laser rangefinder includes an optical path base body 1, a PCB board 2, an emission optical path 3 and a reception optical path 4; the optical path base body 1 comprises a housing 11, a first panel 12, a second panel 13 and a third panel 14; the emission light path sequentially comprises a diode 31 for emitting laser, an emission collimating lens 32 for focusing the emitted laser, an emission laser reflecting mirror 33 and a second emission laser reflecting mirror 34; the receiving light path sequentially comprises a receiving collimating lens 41, a receiving laser mirror 42 and a photoelectric sensor 43 for receiving emitted laser; the laser range finder further comprises a pendulum body 5, and a pendulum bearing hole 111 matched with the pendulum body 5 is formed in a shell 11 of a light path base main body of the laser range finder, so that the pendulum body 5 can freely and slightly swing in the pendulum bearing hole 111; the emission collimating lens 32 is fixed at the center of the pendulum body 5, and the position of the emission collimating lens 32 is adjusted by adjusting the position of the pendulum body 5, so that the optical axis of the emitted laser is adjusted.

The pendulum body 5 comprises a displacement plate 51 for fixing the emission collimation lens 32 and a spherical shell-shaped convex edge 52 matched with the pendulum bearing hole, and the spherical shell-shaped convex edge 52 can slightly swing in the pendulum bearing hole 111; the displacement plate 51 is provided with at least three adjusting holes 511, and each adjusting hole is provided with a matched adjusting screw rod 512 and threads; the outer shell 11 of the optical path base main body is provided with a mounting hole 112 matched with the adjusting hole 511, and the pendulum body 5 and the outer shell 11 of the optical path base main body are connected with each other through the adjusting hole 511, the mounting hole 112, the matched adjusting screw rod 512 and threads; by adjusting any adjusting screw 512, the position of the displacement plate 51 can be adjusted slightly.

The laser range finder further comprises a second pendulum body 6, and a second pendulum bearing hole 113 matched with the second pendulum body 6 is formed in a shell 11 of a light path base main body of the laser range finder, so that the second pendulum body 6 can freely and slightly swing in the second pendulum bearing hole 113; the laser receiving reflector 42 is fixed at the center of the second pendulum 6, and the position of the laser receiving reflector 42 is adjusted by adjusting the position of the second pendulum 6, so that the optical axis of the received laser is adjusted.

Further, the second pendulum body 6 comprises a displacement plate 61 for fixing the laser receiving mirror 42 and a spherical shell-shaped ledge 62 matched with the second pendulum bearing hole 113, wherein the spherical shell-shaped ledge 62 can slightly swing in the second pendulum bearing hole 113; the displacement plate is provided with at least three adjusting holes 611, and each adjusting hole 611 is provided with a matched adjusting screw rod 612 and threads; the outer shell 11 of the optical path base main body is provided with an installation hole 114 matched with the adjusting hole 611, and the pendulum body 6 and the outer shell 11 of the optical path base main body are connected through the adjusting hole 611, the installation hole 114, the matched adjusting screw rod 612 and threads; by adjusting any adjusting screw 612, the position of the displacement plate 61 can be adjusted slightly.

Further, the receiving light path at least comprises a filter for filtering non-emitted light wavelength.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the utility model, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims

1. A laser range finder comprises a light path base main body, a PCB (printed circuit board), a transmitting light path and a receiving light path, and is characterized in that a pendulum body is arranged on a shell of the light path base main body, and a light path element on the transmitting light path or the receiving light path is arranged at the center of the pendulum body; the shell of the optical path base main body is provided with a pendulum bearing hole matched with the pendulum body, and the installation angle of the optical path element is slightly changed by adjusting the pendulum body to slightly swing in the pendulum bearing hole, so that the angle of the optical axis is slightly adjusted, and the transmitting optical path and the receiving optical path are coaxial.

2. The laser range finder of claim 1, wherein the emission optical path comprises a diode for emitting laser light and an emission collimating lens for focusing the emitted laser light in that order; the receiving light path sequentially comprises a receiving collimating lens, a receiving laser mirror and a photoelectric sensor for receiving emitted light; the laser range finder also comprises a pendulum body, and a pendulum bearing hole matched with the pendulum body is formed in a shell of a light path base main body of the laser range finder, so that the pendulum body can freely and slightly swing in the pendulum bearing hole; the emission collimating lens is fixed at the center of the pendulum body, and the position of the emission collimating lens is adjusted by adjusting the position of the pendulum body, so that the optical axis of emitted laser is adjusted.

3. The laser range finder of claim 2, wherein the laser range finder further comprises a second pendulum body, and a second pendulum hole matched with the second pendulum body is arranged on a housing of the optical path base main body of the laser range finder, so that the second pendulum body can freely and slightly swing in the second pendulum hole; the laser receiving reflector is fixed at the center of the second pendulum body, and the position of the laser receiving reflector is adjusted by adjusting the position of the second pendulum body, so that the optical axis of the received laser is adjusted.

4. The laser range finder of claim 2, wherein the pendulum comprises a displacement plate for fixing the emission collimating lens and a spherical shell-shaped ledge matching with the bearing hole, the spherical shell-shaped ledge can slightly swing in the bearing hole; the displacement plate is provided with at least three adjusting holes, and each adjusting hole is provided with a matched adjusting screw rod and a matched thread; the shell of the light path base main body is provided with a mounting hole matched with the adjusting hole, and the pendulum body and the shell of the light path base main body are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; and the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod.

5. The laser range finder of claim 1, wherein the receive optical path comprises at least one filter for filtering non-emitted wavelengths.

6. The laser rangefinder of claim 4 wherein an annular soft rubber ring or spring is provided between the adjustment aperture and the housing for repositioning the pendulum.