CN114371466A

CN114371466A - Laser range finder and adjusting method thereof

Info

Publication number: CN114371466A
Application number: CN202111570554.1A
Authority: CN
Inventors: 王振兴
Original assignee: Shenzhen Changmaoxiang Electronics Co ltd
Current assignee: Shenzhen Changmaoxiang Electronics Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-04-19

Abstract

A laser range finder and its adjustment method, including a beam source, a photoelectric detector, at least one beam shaping optical mirror, an optical mirror support, circuit board, a beam distribution optical mirror and a junction device; said beam source comprising a first electro-optical assembly for emitting a laser beam along an optical axis, said photodetector comprising a second electro-optical assembly for receiving a reflected and/or scattered received beam by said target object along an optical axis, said beam shaping optic for forming a laser beam and/or a received beam along an optical axis, said optic holder having a first receptacle for holding said first electro-optical assembly and a second receptacle for holding said at least one beam shaping optic, said circuit board having a further receptacle for holding said second electro-optical assembly, said connecting means for connecting the optic holder to the circuit board; the beam distribution optics are mounted on an adjustment support.

Description

Laser range finder and adjusting method thereof

Technical Field

The invention relates to the technical field of laser measurement, in particular to a laser range finder with coaxial transmitting optical axis and receiving optical axis.

Background

A laser distance measuring device is a measuring device for a laser distance measuring system, comprising an electro-optical component designed as a beam source, a further electro-optical component designed as a detector, a transmitting optical mirror and a receiving optical mirror. The beam source and the emission optics are referred to as emission means; and the detector and the receiving optics are referred to as receiving means. The beam source emits a laser beam along an optical axis. The laser beam is bundled by the emission optical mirror and directed to a target object. The received beam reflected and/or scattered by the target object is shaped by the receiving optics and directed towards the detector along one optical axis. The measuring device is divided into a paraxial configuration, in which the optical axes of the transmitting and receiving devices extend offset in parallel, and a coaxial configuration, in which the optical axes of the transmitting and receiving devices overlap one another and are separated by means of a beam-distributing optical mirror. In the coaxial arrangement, the transmitting and receiving optics are integrated into a common beam shaping optics that shapes the laser beam and the receiving beam.

Document CN201210157986.4 discloses a measuring device for distance measurement, comprising an electro-optical component designed as a beam source, a further electro-optical component designed as a detector, a beam shaping optical mirror, a beam distributing optical mirror, an optical mirror holder and a circuit board. The optical lens holder is connected to the circuit board via a connecting device. The beam source is designed as a laser diode which produces a laser beam in the visible spectrum, for example a red laser beam with a wavelength of 635nm or a green laser beam with a wavelength of 532 nm. The detector is designed as a photodiode, the characteristics of which are matched to the laser diode. A control and evaluation device is connected to the beam source and the detector and determines the distance to the target object from a time difference between the reference beam and the received beam detected by the detector.

The beam shaping optical mirror is configured as a lens that shapes both the emitted laser beam and the received beam. The laser beam is separated from the coaxially extending received beam by means of a beam distribution optical mirror. The beam distribution optics are arranged in the beam path of the emitted laser beam between the beam source and the beam shaping optics and in the beam path of the reflected and/or scattered received beam between the beam shaping optics and the detector. The beam splitter optics are designed as a polarizing beam splitter, which is designed to transmit predominantly light with the polarization direction of the emitted laser beam (transmission factor greater than approximately 80%) and to reflect partially unpolarized light (reflection factor of approximately 50%). The radiation beam reflected at the target object, i.e. the reflected part of the received radiation beam, has a high intensity and has the same polarization direction as the emitted laser beam, whereas the radiation beam scattered at the target object, i.e. the scattered part of the received radiation beam, is unpolarized. By means of the beam splitter optics, the portion of the received beam that is reflected at the target object and is therefore polarized is strongly attenuated in order to prevent overshooting of the detector.

The circuit board is the carrier for the electrical and electro-optical components and is used for mechanical fixing and electrical connection. The printed circuit board is made of an electrically insulating material, such as fiber-reinforced plastic, polytetrafluoroethylene or ceramic, with connected conductor tracks. These components are soldered onto the soldering surface or into the soldering eye and in this way are simultaneously mechanically held and electrically connected. The larger component may be secured to the circuit board by means of gluing and screwing.

The beam source, the beam shaping optics and the beam distribution optics are arranged on an optics holder. The optical mirror holder has a first receptacle for a first electro-optical component designed as a beam source, a second receptacle for a beam shaping optical mirror and a third receptacle for a beam splitter optical mirror. A second electro-optical component, which is designed as a detector, is arranged in a further receptacle on the circuit board, wherein the circuit board serves as a further optical mirror support for the second electro-optical component.

The optical lens holder is formed as a one-piece optical lens holder which is not composed of a plurality of parts but is composed of one material. The integral optic holder has no connecting zone between the first and second connection partners. The optical lens holder is made of a metallic material, for example zinc. The metallic optic support results in electrical shielding between the electro-optical components and reduces electrical cross-talk between the beam source and the detector. Zinc has a high temperature stability, so that temperature fluctuations frequently encountered by laser distance measuring systems exert only a small influence on the setting state of the installed components and the measurement behavior of the measuring device. Furthermore, the zinc can be machined in a die-casting process with high precision, so that the seats are accommodated, very precisely manufactured and mutually positioned.

The detector is arranged on the front side of the circuit board facing the optical mirror support and is fixedly connected to the circuit board via a soldered connection, and the detector can be assembled and soldered automatically, for example, during the production of the circuit board. The detector is only connected to the circuit board and is mechanically held without a connection directly connecting the detector to the optic holder. The side of the optical mirror holder facing the detector in the mounted state is open at least in the region of the detector and is connected with the first contact surface via a connecting device to a second contact surface arranged on the front side of the circuit board. The connecting device is designed to be releasable at least during the adjustment of the measuring device and the adjustment of the detector.

The beam source emits a diverging primary laser beam along an optical axis. The primary laser beam strikes the polarization beam splitter, whereupon the largest possible portion is transmitted and strikes the beam shaping optics as a divergent secondary laser beam in the direction of the optical axis. The beam shaping optical mirror bundles the laser beam and directs the cubic laser beam having a small divergence to the target object in the optical axis direction.

The received radiation reflected and/or scattered by the target object, which is referred to below as the primary received radiation, impinges on a beam shaping optical mirror, which focuses the primary received radiation and directs it as a secondary received radiation to a beam distribution optical mirror. The optical axis of the secondary received beam is coaxial with the optical axis of the secondary laser beam. The secondary receive beam is at least partially reflected by the beam-distributing optical mirror and the reflected portion is directed as a tertiary receive beam along the optical axis towards the detector. The beam distribution optics are responsible for distinguishing the optical axis of the tertiary received beam from the optical axis of the primary laser beam.

The beam source and the beam shaping optics are each configured to be adjustable in their receiving seats at least during the adjustment of the measuring device in a forward and/or backward direction extending parallel to the associated optical axis, the forward and/or backward direction also being referred to as the adjustment direction. The beam source and the beam-shaping optics are adjustable during adjustment of the measuring device only in the respective adjustment direction and are not provided with adjustability in a plane direction perpendicular to the optical axis.

The adjustment of the measuring device is carried out by means of an optical instrument comprising a lens and a digital camera chip arranged in the focal plane of the lens. The optical instrument is adjusted to a desired object distance, wherein the object distance can be adjusted to a finite distance of, for example, 10m or to an infinite distance. The measuring device is arranged in front of the lens in such a way that the lens captures the three laser beams and images of the active area of the detector and images them on the camera chip. Both the laser beam and the image of the active surface of the detector are simultaneously represented on the camera chip.

The adjustment of the measuring device is effected in two steps: in a first step, the optical components in the optical mirror support are adjusted in their respective adjustment directions, and in a second step, after the adjustment of the optical mirror support, the detector is adjusted in a plane perpendicular to the associated optical axis. The first and second receptacles in the optical mirror support are designed such that the optoelectronic component and the beam shaping optical mirror are adjustable only in their adjustment direction, and adjustment in a plane perpendicular to the optical axis is not possible.

In a first step, the beam splitter optic is first placed in the third receptacle and fixed to the optic holder. The connection can be designed to be releasable or non-releasable. The beam source and the beam-shaping optics are then placed into their receiving seats. For adjusting the beam shaping optics and the beam source, a circuit board with a detector is adapted to the optics holder in a stop manner and is releasably connected to the optics holder by means of a connecting device.

The beam-shaping optical mirror is moved in its adjustment direction until the optical instrument adjusted to the desired object distance detects a sharp image of the active area of the detector by the beam-shaping optical mirror, wherein the image is sharp at high contrast. At maximum image resolution, the beam-shaping optics are adjusted to a desired distance from the active surface of the detector, which distance corresponds to the object distance of the optical instrument. The second receptacle for the beam shaping optical mirror is designed, for example, as a press fit and the beam shaping optical mirror is fixed by a clamping force of the press fit; the displacement of the beam-shaping optical element in the adjustment direction takes place with a sufficiently large pressure force against the clamping force of the press fit. Alternatively or in addition to the press fit, the beam shaping optics can be connected to the optic holder in a material-locking manner, for example by means of an adhesive connection.

The beam source is adjusted after the beam shaping optics. The beam source emits a laser beam which is monitored by means of the optical device. The beam source is moved in said direction until the optical instrument detects a minimum focus of the laser beam by means of the beam shaping optics. In this case, the beam waist of the laser beam is located in the desired distance. The first receptacle for the beam source is configured, for example, as a press fit and the beam source is fixed by means of a clamping force of the press fit; the movement of the beam source in the adjustment direction takes place with a sufficiently large pressure force against the clamping force of the press fit. Alternatively or in addition to the press fit, the beam source can be connected to the optical mirror holder in a material-locking manner, for example by means of an adhesive connection.

The detector is adjusted after the optical lens holder is adjusted. Since the detector is not releasably connected to the circuit board via a soldered connection, the adjustment of the detector relative to the optical mirror support takes place via the circuit board. For this purpose, the connection device, which is designed to be releasable at least during the adjustment of the measuring device, is released between the optical lens holder and the circuit board. The beam source is switched on and emits a laser beam which is picked up by the optical instrument together with an image of the active detector area. The laser beam forms a focal point on the camera chip and the effective detector surface forms a sharp image, which is superimposed on the focal point of the laser beam. The circuit board is moved with the optical mirror carrier in a stop manner in a plane oriented perpendicularly to the optical axis of the three received beams until the focal point of the laser beam is located in a defined region of the active surface of the detector on the camera chip. The position of the focal point of the laser beam coincides with the position of a received beam focused on the photodiode, which is scattered by a target object arranged in the object distance of the optical device.

The adjusted circuit board is then connected to the optic holder. This permanent connection is achieved in two steps. In a first step, the printed circuit board is connected to the optical lens holder via an adhesive connection in a force-free manner. In a second step, the circuit board is connected to the optical lens holder via a screw connection. Alternatively, the circuit board can first be screwed under sufficient contact pressure and then additionally reinforced with a glue.

During the gluing, the forces are transmitted in a planar manner from one to the other connection object. The adhesive bonding does not require a change of the bonding object and can perform the reverse operation without damaging the bonding object in many cases. But the adhesive connection may change under the influence of temperature. At low temperatures this may lead to embrittlement of the adhesive bond and at high temperatures to softening of the adhesive bond. In the case of a threaded connection, stress concentrations occur on the connection partners, while the space between them is hardly subjected to force transmission. Advantageously, the threaded connection is only subjected to small temperature influences. Furthermore, the screw connection produces an electrical connection between the optic holder and the circuit board.

The inventor finds that, in the above technical solution, the adjustment of the measuring device is implemented in two steps: in a first step, the optical components in the optical mirror support are adjusted in their respective adjustment directions, and in a second step, after the adjustment of the optical mirror support, the detector is adjusted in a plane perpendicular to the associated optical axis. Wherein the adjustment of the detector relative to the optic holder is effected via an adjustment of the circuit board.

Because many electronic components are disposed on the circuit board, trimming the circuit board may cause the electronic components to be detached.

Disclosure of Invention

The invention aims to provide a laser range finder, which realizes fine adjustment of a measuring device by a method of adjusting a beam distribution optical lens.

The technical scheme adopted by the invention is as follows: a laser rangefinder for measuring the distance between a reference mark and a target object (1); the laser range finder comprises a beam source, a photoelectric detector (2), at least one beam shaping optical mirror (3), an optical mirror bracket (4), a circuit board (5), a beam distribution optical mirror (6) and a connecting device (7); said beam source comprising a first electro-optical assembly (11) for emitting a laser beam along an optical axis, said photodetector comprising a second electro-optical assembly for receiving a reflected and/or scattered reception beam by said target object along an optical axis, said beam shaping optic for forming a laser beam (12) and/or a reception beam (13) along an optical axis, said optic holder having a first receptacle (41) for holding said first electro-optical assembly (11) and a second receptacle (42) for holding said at least one beam shaping optic, said circuit board having a further receptacle (51) for holding said second electro-optical assembly, said connection means for connecting the optic holder to the circuit board;

characterized in that the beam-distributing optics are mounted on an adjusting mount (8) having a third receptacle (45) for fixing the adjusting mount; during the adjustment of the laser distance measuring device, the first electro-optical component arranged in the optical mirror support is adjustable in the direction of the associated optical axis relative to the optical mirror support and can be fixed in the adjusted position; in addition, the beam distributing optics mounted on the adjusting carriage are adjustable relative to the optics carriage and fixable in the adjusted position.

Furthermore, the adjusting bracket comprises a pendulum structure (81), the third accommodating seat (45) is provided with a pendulum bearing hole (451) matched with the pendulum structure, and the beam distribution optical lens (6) is assembled on the pendulum structure; by adjusting the pendulum body structure to slightly swing in the bearing hole, the beam distribution optical lens on the pendulum body structure also swings, so that the direction of the optical axis associated with the beam distribution optical lens is adjusted.

In particular, the pendulum structure (81) comprises a displacement plate (811) for fixing the beam distribution optics and a spherical shell-like ledge (812) cooperating with the pendulum aperture (451), the spherical shell-like ledge being able to slightly swing within the pendulum aperture; the displacement plate is provided with at least three adjusting holes (813), and each adjusting hole is provided with a matched adjusting screw rod (814) and a matched thread; the third accommodating seat is provided with a mounting hole (452) matched with the adjusting hole, and the pendulum body and the third accommodating seat are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod, so that the beam distribution optical lens on the displacement plate also swings along with the adjustment of the position of the optical axis of the beam distribution optical lens.

Optionally, the second electro-optical component is arranged at a front position of the circuit board facing the optical mirror bracket and fixedly connected with the circuit board; during the adjustment of the laser distance measuring device, the circuit board is adjustable relative to the optical mirror support in a plane substantially perpendicular to the associated optical axis of the second electro-optical component and can be fixed in the adjusted position.

Optionally, the second electro-optical component is arranged at a rear position of the circuit board, which is back to the optical mirror bracket; during the adjustment of the laser distance measuring device, the second electro-optical component is adjustable relative to the circuit board in a plane substantially perpendicular to the associated optical axis of the second electro-optical component and can be fixed in the adjusted position.

In particular, during the adjustment of the laser distance measuring device, the beam shaping optical mirror arranged in the optical mirror support is adjustable in the direction of the associated optical axis relative to the optical mirror support and can be fixed in the adjusted position.

In particular, the connecting device, which connects the first contact surface of the optical lens holder to the second contact surface of the circuit board, is designed as a screw connection.

In particular, the connecting device, which connects the first contact surface of the optical lens holder to the second contact surface of the circuit board, is designed as an adhesive and screw connection.

A method for adjusting a laser range finder comprises the following steps:

adjusting a first electro-optical component (11) in the optic holder (4) along an adjustment direction;

-fixing the photodetector (2) to the circuit board (5);

the angle of the beam splitter is adjusted by adjusting the holder (8) such that the laser beam (12) and the received beam (13) are coaxial.

The beam-shaping optical element (3) in the optical element holder (4) is adjusted along the adjustment direction.

The invention has the beneficial effects that: the laser range finder adjusting device skillfully adjusts the beam distribution optical lens through the adjusting bracket, realizes the adjustment of the laser range finder, and overcomes the defect that the laser range finder is adjusted through adjusting a circuit board in the prior art.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention; embodiment 1 is a coaxial laser distance measuring device having a beam source, a photodetector and a beam splitter optic, the beam source being inserted into the optic holder, the photodetector being arranged in a front position of the circuit board facing the optic holder and being fixedly connected to the circuit board during adjustment of the laser distance measuring device.

FIG. 2 is a schematic three-dimensional view of an adjustment bracket of the present invention;

FIG. 3 is an exploded view of the adjusting bracket of the present invention;

FIG. 4 is a schematic cross-sectional view of an adjusting bracket according to the present invention;

fig. 5 shows an embodiment 2 of an in-line laser distance measuring device with a beam source, a photodetector and a beam splitter optic, the beam source being inserted into the optic holder, the photodetector being arranged at a rear position of the circuit board facing away from the optic holder and being adjustable relative to the circuit board during adjustment of the laser distance measuring device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention. 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 of embodiment 1, a laser rangefinder for measuring the distance between a reference mark and a target object (1); the laser range finder comprises a beam source, a photoelectric detector (2), at least one beam shaping optical mirror (3), an optical mirror bracket (4), a circuit board (5), a beam distribution optical mirror (6) and a connecting device (7); the beam source comprising a first electro-optical component (11) for emitting a laser beam along an optical axis, the photodetector comprising a second electro-optical component, for receiving a receive beam reflected and/or scattered by said target object along an optical axis, the beam-shaping optics are used to form a laser beam (12) and/or a received beam (13) along an optical axis, the optical mirror support has a first receptacle (41) for holding the first electro-optical component (11) and a second receptacle (42) for holding the at least one beam-shaping optical mirror, the circuit board has a further receptacle (51) for fixing the second electro-optical component, the connecting device is used for connecting the first contact surface of the optical lens bracket with the second contact surface (52) of the circuit board;

the beam-distributing optics are mounted on an adjusting mount (8) having a third receptacle (45) for holding the adjusting mount; during the adjustment of the laser distance measuring device, the first electro-optical component arranged in the optical mirror support is adjustable in the direction of the associated optical axis relative to the optical mirror support and can be fixed in the adjusted position; in addition, the beam distributing optics mounted on the adjusting carriage are adjustable relative to the optics carriage and fixable in the adjusted position.

The adjusting bracket comprises a pendulum body structure (81), the third accommodating seat (45) is provided with a pendulum bearing hole (451) matched with the pendulum body structure, and the beam distribution optical lens (6) is assembled on the pendulum body structure; by adjusting the pendulum body structure to slightly swing in the bearing hole, the beam distribution optical lens on the pendulum body structure also swings, so that the direction of the optical axis associated with the beam distribution optical lens is adjusted.

The pendulum body structure (81) comprises a displacement plate (811) for fixing the beam distribution optical lens and a spherical shell-shaped convex edge (812) matched with the pendulum bearing hole (451), 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 (813), and each adjusting hole is provided with a matched adjusting screw rod (814) and a matched thread; the third accommodating seat is provided with a mounting hole (452) matched with the adjusting hole, and the pendulum body and the third accommodating seat are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod, so that the beam distribution optical lens on the displacement plate also swings along with the adjustment of the position of the optical axis of the beam distribution optical lens.

The second electro-optical component is arranged on a front side of the circuit board facing the optical mirror support and is fixedly connected with the circuit board.

During the adjustment of the laser distance measuring device, the beam shaping optics arranged in the optics holder are adjustable in the direction of the associated optical axis relative to the optics holder and can be fixed in the adjusted position.

The connecting means connecting the first contact surface of the optic holder with the second contact surface (52) of the circuit board may be an adhesive and a screw connection.

During the adjustment of the laser distance measuring device, the beam source (or the first electro-optical component (11)) and the beam shaping optical mirror (3) are each adjustable in a forward and/or backward direction extending parallel to the associated optical axis, wherein the forward and/or backward direction is also referred to as the adjustment direction.

The method for adjusting the laser range finder disclosed in example 1 is as follows:

-fixing the photodetector (2) to the circuit board (5);

Embodiment 2 as shown in fig. 1, fig. 2, fig. 3, fig. 5, differs from embodiment 1 in the arrangement of the beam source (or first electro-optical component (11)) and the photodetector (2) (or second electro-optical component). Unlike embodiment 1, the beam source is disposed on the circuit board and the photodetector is disposed in the optical mirror holder.

Embodiment 2 comprises an optical mirror holder in which a detector 2 comprising a first electro-optical component, a beam shaping optical mirror 3 and a beam distributing optical mirror 6 are arranged, and a circuit board 5 on which a beam source 11 is arranged as a second electro-optical component. The circuit board 5 is detachably connected to the optical mirror mount 4 via the connecting device 7 at least during the adjustment of the laser distance measuring device 21.

The adjustment method of example 2 is as follows:

-fixing the photodetector (2) to the circuit board (5);

the angle of the beam splitter is adjusted by adjusting the holder (8) so that the laser beam is coaxial with the received beam.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A laser rangefinder for measuring the distance between a reference mark and a target object (1); the laser range finder comprises a beam source, a photoelectric detector (2), at least one beam shaping optical mirror (3), an optical mirror bracket (4), a circuit board (5), a beam distribution optical mirror (6) and a connecting device (7); said beam source comprising a first electro-optical assembly (11) for emitting a laser beam along an optical axis, said photodetector comprising a second electro-optical assembly for receiving a reflected and/or scattered reception beam by said target object along an optical axis, said beam shaping optic for forming a laser beam (12) and/or a reception beam (13) along an optical axis, said optic holder having a first receptacle (41) for holding said first electro-optical assembly (11) and a second receptacle (42) for holding said at least one beam shaping optic, said circuit board having a further receptacle (51) for holding said second electro-optical assembly, said connection means for connecting the optic holder to the circuit board;

2. Laser rangefinder according to claim 1, characterized in that the adjustment bracket comprises a pendulum structure (81), on which the beam distribution optics (6) is mounted, and in that the third housing seat (45) is provided with a pendulum aperture (451) cooperating with the pendulum structure; by adjusting the pendulum body structure to slightly swing in the bearing hole, the beam distribution optical lens on the pendulum body structure also swings, so that the direction of the optical axis associated with the beam distribution optical lens is adjusted.

3. The laser distance meter according to claim 2, characterized in that said pendulum structure (81) comprises a displacement plate (811) for fixing said beam distribution optics and a spherical-shell-like ledge (812) cooperating with said bearing hole (451), said spherical-shell-like ledge being able to slightly oscillate within said bearing hole; the displacement plate is provided with at least three adjusting holes (813), and each adjusting hole is provided with a matched adjusting screw rod (814) and a matched thread; the third accommodating seat is provided with a mounting hole (452) matched with the adjusting hole, and the pendulum body and the third accommodating seat are connected through the adjusting hole, the mounting hole and a matched adjusting screw rod and threads; the position of the displacement plate can be slightly adjusted by adjusting any adjusting screw rod, so that the beam distribution optical lens on the displacement plate also swings along with the adjustment of the position of the optical axis of the beam distribution optical lens.

4. The laser rangefinder of claim 1 wherein the second electro-optical assembly is disposed on a front face of the circuit board facing the optic holder; during adjustment of the laser distance measuring device, the circuit board is adjustable relative to the optical mirror support in a plane substantially perpendicular to the associated optical axis of the second electro-optical component.

5. The laser range finder of claim 1, wherein the second electro-optical assembly is disposed on a circuit board at a rear location facing away from the optic holder; during adjustment of the laser distance measuring device, the second electro-optical component is adjustable relative to the circuit board in a plane substantially perpendicular to the associated optical axis of the second electro-optical component.

6. Laser rangefinder according to claim 1 or 2, characterized in that the beam shaping optical mirror arranged in the optical mirror support is adjustable in the direction of the associated optical axis relative to the optical mirror support during adjustment of the laser rangefinder and fixable in the adjusted position.

7. Laser distance measuring device according to one of claims 1 to 6, wherein said connecting means connecting the optic holder to the circuit board are screw connections.

8. A method of adjusting a laser rangefinder as claimed in any of claims 1 to 7 comprising the steps of:

-fixing the photodetector (2) to the circuit board (5);

9. A method of adjusting a laser rangefinder as claimed in claim 8, comprising the steps of: the beam-shaping optical element (3) in the optical element holder (4) is adjusted along the adjustment direction.