Laser distance measuring device giving consideration to mirror reflection and diffuse reflection

Abstract

The utility model discloses a laser ranging device considering mirror reflection and diffuse reflection. The laser ranging device comprises a laser; the optical switcher is detachably integrated on the laser device, and the optical switcher comprises a plurality of optical components and is used for changing laser emitted from the laser device to the surface of an object to be measured so as to switch diffuse reflection type distance measurement and specular reflection type distance measurement on the surface of the object to be measured. Distance measurement of different surfaces can be realized through whether the optical switcher is installed or not, the application range is wide, and operation is convenient. The laser transmitter of the laser device matched with the distance measuring device is integrated, the whole distance measuring device is small in size, and the feasibility of installation and distance measurement in precision equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser ranging technical field especially is involved in a laser ranging device of giving consideration to mirror surface reflection and diffuse reflection. BACKGROUND

[0002] Linear laser ranging technology occupies an important position in today's measurement field. Its core components cover laser emitter, imaging system (typical such as camera) and the object to be measured. The laser emitter emits a linear laser beam, which is projected onto the surface of the object to be measured. Due to the diversity of the geometry of the object surface, including height difference and complex shape change, the light distribution formed by the reflection of the laser on the object surface presents significant differences. Then, the imaging system captures the reflected light and generates an image. In this image, the position offset of the laser line and the distortion characteristics of the shape are accurately recorded. By analyzing these changes in depth and combining the information of the key parameters of the system determined in advance, such as the fixed distance between the laser emitter and the imaging system, the principle of similarity based on triangle is used for precise calculation, and then the distance data of each point on the object surface relative to the measurement system can be accurately determined, and finally the complete contour shape information of the object is constructed, which provides a very key data basis for many industrial measurement, three-dimensional reconstruction and other application scenarios.

[0003] In related technologies, the laser ranging devices developed on the market are all for measuring distance in one of the diffuse reflection or mirror reflection. When measuring points with uncertain reflection conditions (may be mirror reflection or diffuse reflection), the incident angle of the laser needs to be rotated according to the specific reflection type, or the angle between the incident light and the plane where the target point is located is changed by moving the target point, so as to realize the distance measurement of the target point. If there are multiple points of diffuse reflection and mirror reflection on the surface of the object to be measured, it is easy to cause the receiver to be unable to receive the signal, and the object surface cannot be effectively measured, and the angle of the laser needs to be adjusted or the target point needs to be moved. No matter which way, it is easy to cause the target point to be measured to be offset, and in a high-precision device with limited space, it is very difficult to adjust the angle of the laser and move the object to be measured. In addition, during the movement, it is difficult to ensure that the target point to be measured is moved to the appropriate position, resulting in deviation between the target point and the actual measurement point, and poor accuracy of the measurement result. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a laser ranging device considering mirror reflection and diffuse reflection, which can realize distance measurement on different surfaces by installing or not installing an optical switch, and the whole device has small volume, wide application range and convenient operation.

[0005] The laser ranging device considering mirror reflection and diffuse reflection has the following effects: first, different from the prior art which only considers one case of diffuse reflection or mirror reflection, the application can realize ranging on different surfaces through the installation of the optical switcher, is widely applicable, and is easy to operate.

[0006] The laser ranging device considering mirror reflection and diffuse reflection has the following effects: first, different from the prior art which only considers one case of diffuse reflection or mirror reflection, the application can realize ranging on different surfaces through the installation of the optical switcher, is widely applicable, and is easy to operate.

[0007] According to some embodiments of the utility model, the laser directly emits to the target point of the measured object surface and the laser emits to the target point of the measured object surface through the optical switcher.

[0008] According to some embodiments of the utility model, the multiple optical components include: an emission lens for receiving the laser of the laser and projecting the laser to form emission light; a mirror assembly, the mirror assembly includes at least two mirrors, one of the mirrors is used for receiving the emission light and reflecting to another mirror to form first reflected light, another mirror is used for receiving the first reflected light and reflecting to the measured object surface to form second reflected light, the third reflected light formed by the diffuse reflection or mirror reflection of the second reflected light by the measured object returns to the laser.

[0009] According to some embodiments of the utility model, the emission lens is a plano-concave cylindrical lens.

[0010] According to some embodiments of the utility model, one side of the plano-concave cylindrical lens is a plane and the other side is a concave surface, and the plane faces the laser of the laser.

[0011] According to some embodiments of the utility model, the emission lens is arranged in front of the emission port of the laser, one of the mirrors is arranged in front of the emission lens along the emission direction of the laser, and another mirror is arranged on one side of the mirror, and at least two mirrors are arranged obliquely relative to the emission direction.

[0012] According to some embodiments of the present application, the optical switch further comprises: an optical component fixing structure for fixing a plurality of optical components and fixedly connected with the laser; and an optical component fixing structure shell covering the optical component fixing structure and abutting against the laser.

[0013] According to some embodiments of the present application, the optical component fixing structure has an inner cavity, a plurality of the optical components are fixed on the cavity wall of the inner cavity, and the opening at one end of the inner cavity faces the emission port of the laser and the opening at the other end faces the surface of the object to be measured.

[0014] According to some embodiments of the present application, a first mounting hole is formed on the optical component fixing structure, a second mounting hole is formed on the laser, a first connecting piece is fixed to the laser after being inserted into the first mounting hole and the second mounting hole; and / or, a third mounting hole is formed on the optical component fixing structure, a fourth mounting hole is formed on the optical component fixing structure shell, and a second connecting piece is fixed to the optical component fixing structure shell after being inserted into the second mounting hole and the fourth mounting hole.

[0015] According to some embodiments of the present application, the laser comprises: a shell, a transmitter and a receiver, the transmitter and the receiver are arranged in the shell, and the optical switch is detachably integrated on the shell.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0018] Figure 1 is a schematic diagram of the internal structure of the laser and the optical switch according to the embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the external structure of the laser and the optical switch according to the embodiment of the present application Figure 1 ;

[0020] Figure 3 is a schematic diagram of the external structure of the laser and the optical switch according to the embodiment of the present application Figure 2 ;

[0021] Figure 4 is a schematic diagram of the light beam of the laser without the optical switch according to the embodiment of the present application;

[0022] Figure 5 Fig. 1 is a schematic diagram of the dimensions of a laser local structure and an optical switch external structure according to an embodiment of the present application.

[0023] Reference signs:

[0024] 1, laser; 2, optical switch; 3, surface of an object to be measured; 4, transmitting lens; 5, reflecting mirror; 6, optical component fixing structure; 601, inner cavity; 602, first mounting hole; 7, optical component fixing structure shell; 701, fourth mounting hole; 8, third reflected light. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below, and the embodiments described with reference to the drawings are exemplary, and the embodiments of the present application will be described in detail below.

[0026] Reference will be made to Figures 1-5 a laser ranging device considering both mirror reflection and diffuse reflection according to an embodiment of the present application.

[0027] As Figures 1-5 shown, the laser ranging device comprises a laser 1 and an optical switch 2, the optical switch 2 is detachably integrated on the laser 1, the optical switch 2 comprises a plurality of optical components, and is used for changing laser emitted from the laser 1 to a surface 3 of an object to be measured, so as to switch diffuse reflection type ranging and mirror reflection type ranging of the surface 3 of the object to be measured.

[0028] It can be understood that when the optical switch 2 is not installed on the laser 1, the laser 1 can be used to realize ranging of one of diffuse reflection type and mirror reflection type of the surface 3 of the object to be measured. When the optical switch 2 is installed on the laser 1, the optical switch 2 and the laser 1 are integrated, and ranging of the other of diffuse reflection type and mirror reflection type of the surface 3 of the object to be measured can be realized.

[0029] For example, in the present example, as Figure 4 shown, the single laser 1 can realize diffuse reflection type ranging of the surface 3 of the object to be measured. When the optical switch 2 is installed on the laser 1, as Figure 1 shown, the laser emitted by the laser 1 is projected to the surface 3 of the object to be measured after passing through a plurality of optical elements in the optical switch 2, so as to realize mirror reflection type ranging of the surface 3 of the object to be measured. It should be noted that the present example and the drawing description are for the case that the measured point of the surface 3 of the object to be measured may have diffuse reflection or mirror reflection.

[0030] In fact, it can also be another implementation, that is, a single laser 1 can realize the measurement of the mirror reflection type of the surface 3 of the object to be measured. When the optical switch 2 is integrated on the laser 1, the measurement of the diffuse reflection type of the surface 3 of the object to be measured can be realized. In this way, the mirror reflection type and the diffuse reflection type of the surface 3 of the object to be measured can be switched by installing the optical switch 2 without moving the laser 1 or the object to be measured.

[0031] Of course, the laser 1 and the laser 1 integrated with the optical switch 2 can also measure different surfaces 3 of the object to be measured, and can also measure different target points of the surface 3 of the object to be measured, and so on. It is only necessary to selectively install the optical switch 2 according to the reflection of the surface 3 of the object to be measured.

[0032] In addition, the size of the entire laser ranging device is as shown in Figure 5 L1 is the width of the laser 1, and L2 is the thickness of the laser 1. Specifically, L1* L2 can be 58mm* 19mm. In this way, the structure is very small and compact, and can be applied to high-precision equipment with small reserved space.

[0033] Therefore, compared with the prior art, the laser ranging device of the present application takes into account both mirror reflection and diffuse reflection, and includes a laser 1 and an optical switch 2. Unlike the prior art which only considers one of the two cases, the present application can realize the measurement of different surfaces by installing or not installing the optical switch 2, which is widely applicable and easy to operate. In addition, the laser 1 with the optical switch 2 is integrated, and the entire laser ranging device is small in size, which improves the feasibility of installation and measurement in precision equipment.

[0034] According to some embodiments of the present application, the target point of the surface 3 of the object to be measured directly emitted by the laser 1 is the same as the target point of the surface 3 of the object to be measured emitted by the laser 1 through the optical switch 2.

[0035] In this way, the target point measured by the laser remains unchanged before and after the installation of the optical switch 2. Unlike the prior art, the switching of mirror reflection and diffuse reflection measurement will cause the target point of the surface to be measured to deviate, and the measurement result of the laser ranging device of the present application is more accurate and reliable.

[0036] In the present example, as shown in Figure 1 and Figure 4 When measuring the target point A of the surface 3 of the object to be measured which may have both diffuse reflection and mirror reflection characteristics, the laser 1 or the object to be measured does not need to be moved, and only the optical switch 2 needs to be installed. During this period, the measured point remains unchanged, further improving the accuracy of the measurement.

[0037] According to some embodiments of the present application, the plurality of optical components comprises: a transmitting lens 4 and a mirror assembly. The transmitting lens 4 is used to receive the laser of the laser 1 and project the laser to form a transmitting light. The mirror assembly comprises at least two mirrors 5, one of which is used to receive the transmitting light and reflect it onto the other mirror 5 to form a first reflected light, and the other mirror 5 is used to receive the first reflected light and reflect it onto the surface 3 of the object to be measured to form a second reflected light, and the third reflected light 8 formed by the diffuse reflection or specular reflection of the second reflected light by the object to be measured returns to the laser 1.

[0038] Since the optical path between the emitting point of the laser 1 and the target point A of the surface 3 of the object to be measured is determined, by setting the transmitting lens 4, the optical path of the laser can be changed, so that the optical path from the emitting point of the laser 1 to the target point A of the surface 3 of the object to be measured is unchanged. And by setting the mirror 5, the optical path of the laser can be changed, so that the laser from the emitting point of the laser 1 is projected to the target point A of the surface 3 of the object to be measured after passing through a plurality of optical components.

[0039] In the present example, as shown in Figure 1 When the laser 1 provided with the optical switch 2 measures the target point A of the surface to be measured, first, the laser emitted by the laser 1 is projected onto the transmitting lens 4, and after passing through the transmitting lens 4, the transmitting light is formed and projected onto one of the mirrors 5, and after passing through the one of the mirrors 5, the first reflected light is formed and reflected onto the other mirror 5, and after passing through the other mirror 5, the second reflected light is formed and reflected onto the target point A of the surface 3 of the object to be measured, thereby realizing the specular reflection type distance measurement.

[0040] According to some embodiments of the present application, the transmitting lens 4 is a plano-concave cylindrical lens.

[0041] According to some embodiments of the present application, one side of the plano-concave cylindrical lens is a plane, and the other side is a concave surface, and the plane faces the laser of the laser 1.

[0042] As shown in Figure 1 The plane of the plano-concave cylindrical lens faces the emitting port of the laser 1, which can make the installation distance between the plano-concave cylindrical lens and the emitting port of the laser 1 smaller compared to the concave surface of the plano-concave cylindrical lens facing the emitting port of the laser 1, so that the internal structure of the optical switch 2 is more compact, and further ensures that the volume of the laser distance measuring device of the present application is small, thereby improving the feasibility of installing and measuring distance in precision equipment in limited space.

[0043] Further, the center of the flat concave cylindrical lens and the center of the emitting port of the laser 1 are located on the same straight line along the emitting direction of the laser 1. In this way, the projection effect can be well ensured.

[0044] According to some embodiments of the present application, the emitting lens 4 is arranged in front of the emitting port of the laser 1, one of the mirrors 5 is arranged in front of the emitting lens 4 along the emitting direction of the laser 1, and the other mirror 5 is arranged on one side of the one mirror 5, and the at least two mirrors 5 are arranged in an inclined manner relative to the emitting direction.

[0045] In the present example, as shown in Figure 1 , if the to-be-measured point of the surface 3 of the to-be-measured object is reflected as a mirror reflection, the optical switch 2 is installed on the laser 1. The laser 1 emits laser light, which passes through the emitting lens 4, changes the light path through the one mirror 5, and makes the light path incident on the other mirror 5 at a certain angle. The light path is reflected by the other mirror 5 to the target point A, and finally reflected back into the laser 1, thereby completing the entire laser ranging process. If the to-be-measured point is reflected as a diffuse reflection, as shown in Figure 4 , the optical switch 2 is removed, and the laser 1 emits laser light to the target point A, which is reflected to the laser 1 through diffuse reflection, thereby completing the ranging process.

[0046] According to some embodiments of the present application, the optical switch 2 further comprises an optical component fixing structure 6 and an optical component fixing structure shell 7. The optical component fixing structure 6 is used for fixing a plurality of optical components and is fixedly connected with the laser 1. The optical component fixing structure shell 7 is arranged on the optical component fixing structure 6 and abuts against the laser 1.

[0047] In this way, the optical component fixing structure 6 is detachably connected to the laser 1, and a plurality of optical components are fixed inside the optical component fixing structure 6, so that the plurality of optical components act on the laser light. In addition, the optical component fixing structure 6 is provided with the optical component fixing structure shell 7, so that the laser light passing through the inside of the optical component fixing structure 6 is not affected by the outside, and the appearance of the laser ranging device is also modified.

[0048] According to some embodiments of the present application, the optical component fixing structure 6 has an inner cavity 601, a plurality of optical components are fixed on the cavity wall of the inner cavity 601, and the opening at one end of the inner cavity 601 faces the emitting port of the laser 1, and the opening at the other end faces the surface 3 of the to-be-measured object.

[0049] As shown in Figure 1 , the laser light emitted by the laser 1 is projected into the inner cavity 601 of the optical component fixing structure 6 from one end, passes through the plurality of optical components in the inner cavity 601, and is projected to the surface 3 of the to-be-measured object from the other end of the inner cavity 601.

[0050] According to some embodiments of the present invention, a first mounting hole 602 is formed on the optical component fixing structure 6, a second mounting hole is formed on the laser 1, and a first connector is fixed to the laser 1 after passing through the first mounting hole 602 and the second mounting hole.

[0051] like Figure 3 As shown, the optical component fixing structure 6 has two first mounting holes 602, and correspondingly, the laser 1 has two second mounting holes (not shown in the attached figure) in the thickness direction. A first connector is then inserted through the first mounting holes 602 and the second mounting holes and fixed to the laser 1, achieving a fixed connection between the two and facilitating assembly and disassembly. Specifically, the optical component fixing structure 6 and the laser 1 are connected and fixed by two M2.5 hexagon socket head cap screws.

[0052] According to some embodiments of the present invention, a third mounting hole is formed on the optical component fixing structure 6, a fourth mounting hole 701 is formed on the outer shell 7 of the optical component fixing structure, and the second connector passes through the fourth mounting hole 701 and the third mounting hole and is fixed to the optical component fixing structure 6.

[0053] like Figure 2 As shown, the optical component fixing structure 6 has two third mounting holes (not shown in the attached figure), and correspondingly, the optical component fixing structure housing 7 has two fourth mounting holes 701. A second connector is sequentially inserted through the fourth mounting holes 701 and the third mounting holes and then fixed to the optical component fixing structure 6, thus achieving a fixed connection between the two. Specifically, the optical component fixing structure 6 and the optical component fixing structure housing 7 are connected and fixed by two M2.5 hexagon socket head cap screws.

[0054] In addition, plane 2a of optical component fixing structure 62 is attached to plane 1a of laser 1, plane 2b of optical component fixing structure 6 is attached to plane 1b, and plane 2c of optical component fixing structure 6 is attached to plane 1b.

[0055] According to some embodiments of the present invention, the laser 1 includes a housing, a transmitter, and a receiver, wherein the transmitter and receiver are disposed within the housing, and the optical switcher 2 is detachably integrated onto the housing.

[0056] With this setup, the laser emitted by the transmitter is projected into the optical switcher 2, passes through multiple optical components, and is then projected onto the test point on the surface 3 of the object under test. After passing through the surface 3 of the object under test, the laser finally returns to the receiver.

[0057] Compared with the prior art, the laser ranging device of this invention has the following advantages:

[0058] First, unlike the prior art only considering one case of diffuse reflection or specular reflection, the utility model can realize distance measurement on different surfaces through the installation or non-installation of the optical switch 2, has wide application range and is convenient to operate.

[0059] Second, unlike the prior art, switching between specular reflection and diffuse reflection distance measurement will cause the position deviation of the target point of the measured surface, the target point measured by the laser is always unchanged before and after the installation of the optical switch 2, and the measurement result of the laser distance measuring device of the utility model is more accurate and reliable.

[0060] Third, the laser 1 adapted to the optical switch 2 is integrated, the whole laser distance measuring device is small in size, and the feasibility of installation and distance measurement in precision equipment is improved.

[0061] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0062] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0063] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A laser ranging device that combines specular reflection and diffuse reflection, characterized by, The utility model relates to a laser range finder, and particularly relates to a laser range finder with optical switch. The laser range finder (1) is directly emitted to the target point of the object surface (3) and is the same as the target point of the object surface (3) emitted by the laser range finder (1) through the optical switch (2). The multiple optical components include:

2. The laser ranging device with specular and diffuse reflection according to claim 1, characterized in that, The emitting lens (4) is used for receiving the laser of the laser range finder (1) and projecting the laser to form emitting light; 3. The laser ranging device with specular and diffuse reflection according to claim 1, wherein, The mirror assembly includes at least two mirrors (5), one of which is used for receiving the emitting light and reflecting to the other mirror (5) to form the first reflected light, and the other mirror (5) is used for receiving the first reflected light and reflecting to the object surface (3) to form the second reflected light, and the third reflected light formed by the object surface diffusing or specularly reflecting the second reflected light returns to the laser range finder (1). The emitting lens (4) is a plano-concave cylindrical lens. One side of the plano-concave cylindrical lens is a plane and the other side is a concave surface, and the plane faces the laser of the laser range finder (1).

4. The laser ranging device with specular and diffuse reflection according to claim 3, characterized in that, The emitting lens (4) is arranged in front of the emitting port of the laser range finder (1), one of the mirrors (5) is arranged in front of the emitting lens (4) along the emitting direction of the laser range finder (1), and the other mirror (5) is arranged on one side of the mirror (5), and the at least two mirrors (5) are inclined relative to the emitting direction.

5. The laser ranging device with specular and diffuse reflection according to claim 4, characterized in that, The optical switch (2) further includes:

6. The laser ranging device with specular and diffuse reflection according to claim 3, wherein, The optical component fixing structure (6) is used for fixing the multiple optical components and is fixedly connected with the laser range finder (1); 7. The laser ranging device with specular and diffuse reflection according to claim 1, wherein, The optical component fixing structure shell (7) is arranged on the optical component fixing structure (6) and abuts against the laser range finder (1). The optical component fixing structure (6) has an inner cavity (601), and the multiple optical components are fixed on the cavity wall of the inner cavity (601), one end of the inner cavity (601) is open towards the emitting port of the laser range finder (1), and the other end is open towards the object surface (3). The optical component fixing structure (6) is provided with a first mounting hole (602), the laser range finder (1) is provided with a second mounting hole, a first connecting piece is arranged in the first mounting hole (602) and the second mounting hole and is fixed to the laser range finder (1); and / or 8. The laser ranging device according to claim 7, wherein The optical component fixing structure (6) is provided with a third mounting hole, the optical component fixing structure shell (7) is provided with a fourth mounting hole (701), and a second connecting piece is arranged in the fourth mounting hole (701) and the third mounting hole and is fixed to the optical component fixing structure (6).

9. The laser ranging device according to claim 6, wherein ​ ​ 10. The laser ranging device according to claim 1, wherein The laser (1) comprises a housing, an emitter and a receiver, which are arranged in the housing, and the optical switch (2) is detachably integrated on the housing.

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