A distance measuring optical system

Abstract

The invention relates to a distance measuring optical system, comprising a laser emitter, an object to be measured, a first reflector, an imaging lens, a support seat, a second reflector, a photosensitive target surface and a cylindrical lens barrel; the laser emitter emits a laser beam; the laser beam irradiates the object to be measured placed in the positive direction of the Y axis to form an irradiation point; the laser beam is reflected by the irradiation point to form a first reflection line; the first reflection line is irradiated on the reflection surface at the bottom of the first reflector to form a first reflection point; the first reflection line is reflected by the first reflection point to form a second reflection line; the second reflection line is irradiated on the surface of the imaging lens to form an optical center; the second reflection line passes through the imaging lens and irradiates on the second reflector to form a second reflection point; the second reflection line is reflected by the second reflection point to form a third reflection line; the third reflection line is irradiated on the photosensitive target surface located above the XZ plane to form an imaging point; the technical solution can provide a distance measuring optical system which is easy to produce and manufacture and has a simple and adjustable reflection light path.

Description

Technical Field

[0001] The present invention belongs to the technical field related to optical detection, and in particular relates to a distance measuring optical system. Background Art

[0002] In traditional equipment, the distance of an object is measured by irradiating a laser beam onto the object. The sensor for position detection is based on the principle of triangulation. It detects the position of the imaging point of the lens on the photosensitive target surface, and then obtains the distance information of the object. In order to obtain sufficient detection accuracy, a longer image distance and a larger side viewing angle are required. Under the premise of a certain detected distance, an increase in the side viewing angle will directly lead to an increase in the distance that the lens deviates from the laser beam, which directly causes an increase in the size of the sensor. On the other hand, in order to facilitate the use of the sensor, its size needs to be minimized. There are problems such as complex structure, difficult and complex optical path adjustment, and troublesome manufacturing. Summary of the invention

[0003] The object of the present invention is to provide a distance measuring optical system which is compact, simple in structure, easy to manufacture and has a simple and adjustable reflected light path.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a distance measurement optical system, comprising a laser emitter, an object to be measured, a first reflector, an imaging lens, a support seat, a second reflector and a photosensitive target surface; the laser emitter emits a laser beam; an XYZ three-dimensional coordinate system is established with the laser emitter as the origin; the direction of emission of the laser emitter is the same as the positive direction of the Y axis or forms an inclined angle with the positive direction of the Y axis; the laser beam is located on the YZ plane; the laser beam is irradiated onto the object to be measured placed on the positive direction of the Y axis to form an irradiation point; the laser beam is reflected from the irradiation point to form a first reflection line; the plane where the laser beam and the first reflection line are located is a first optical path plane; the first optical path plane is located on the XY plane; the bottom reflection surface of the first reflector is arranged on the XZ plane There is an angle of forty-five degrees; the first reflected light is irradiated onto the reflecting surface at the bottom of the first reflector to form a first reflection point; the first reflected light is reflected from the first reflection point to form a second reflected light; the plane where the second reflected light and the Z axis of the coordinate system are located is the second optical path plane; the second optical path plane is located on the XZ plane; the second reflected light passes through the optical center at the center of the imaging lens; the second reflected light passes through the imaging lens and irradiates the second reflector to form a second reflection point; the second reflector is installed on the inclined surface of the support seat; the second reflected light is reflected from the second reflection point to form a third reflected light; the plane where the third reflected light is located is the third optical path plane; the third reflected light is irradiated onto the photosensitive target surface above the XZ plane to form an imaging point.

[0005] As a further improvement of the present invention, the intersection line of the first optical path plane and the reflecting surface of the first reflector constitutes a first folding line, and the first folding line is located on the bottom surface of the first reflector and runs parallel to the X-axis of the coordinate system.

[0006] As a further improvement of the present invention, the intersection line of the second optical path plane and the reflecting surface of the second reflector constitutes a second folding line; the second folding line is located on the upper inclined plane of the second reflector and its direction forms an inclined angle with the X-axis of the coordinate system.

[0007] As a further improvement of the present invention, a rotating shaft is fixedly connected between the laser emitter and the first reflector; the rotation axis of the rotating shaft and the reflecting surface of the first reflector are in the same plane and parallel to the X-axis; the laser emitter, the first reflector and the rotating shaft are arranged side by side in sequence in the X-axis direction.

[0008] As a further improvement of the present invention, a cylindrical lens barrel is sleeved on the outside of the support seat; an imaging lens is embedded and installed on the side of the cylindrical lens barrel; a circular hole is opened on the upper surface of the cylindrical lens barrel; a cylindrical support seat is installed on the bottom of the circular hole; an adjustment groove is opened and processed on the lower surface of the support seat; a threaded hole is opened on the side of the support seat; and a limiting groove is opened on the lower side wall of the cylindrical lens barrel.

[0009] As a further improvement of the present invention, the central axis of the cylindrical lens barrel is perpendicular to the XZ plane of the coordinate system; the upper surface of the support seat is processed and set to a forty-five-degree inclined surface; and the photosensitive target surface is set directly above the circular hole.

[0010] As a further improvement of the present invention, an adjustment notch is provided at the bottom of the support seat, and the adjustment notch is in the shape of a straight groove.

[0011] As a further improvement of the present invention, the third optical path plane is perpendicular to the XZ plane.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present technical solution adopts the first reflector and the second reflector to realize a sensor optical path device that requires multi-faceted adjustment, which can effectively realize the miniaturization of the equipment and also facilitate the technical effects of debugging and manufacturing; the side of the cylindrical lens barrel of the present technical solution is embedded with a rotatably mounted imaging lens, which can conveniently adjust the viewing angle relationship between the lens and the laser beam; the laser emitter and the first reflector of the present technical solution are installed on the same rotating shaft, and when it is necessary to rotate the laser beam to measure different positions on the object, the first reflector will also rotate by the same angle, so that the angle of the first reflector can be adjusted at the same time to achieve the technical effect of quickly measuring different positions of the object to be measured; the present technical solution will image The lens is installed on the side wall of the cylindrical lens barrel, which is convenient for adjusting the viewing angle of the lens and the object. The technical solution embeds a support seat with a second reflector into a cylindrical hole of the cylindrical lens barrel and movably installs it. When the imaging point exceeds the allowable range of the photosensitive target surface and cannot be correctly imaged on the photosensitive target surface, the support seat can be rotated and adjusted to a corresponding appropriate position so that the imaging point is focused on the photosensitive target surface, thereby improving the applicability and adjustability of the equipment. The technical solution has a limiting groove on the right side of the cylindrical lens barrel and a threaded hole on the right side of the support seat. When the position of the support seat is adjusted, the external fixing bolt can be passed through the limiting groove and screwed into the threaded hole, and then tightened and fixed, thereby achieving the technical effect of quickly positioning the support seat and the reflector on top of it. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the optical path and equipment installation of the object under test at position P of the present invention.

[0014] Figure 2 It is a schematic diagram of the optical path and equipment installation of the object under test at position Q of the present invention.

[0015] Figure 3 It is a schematic diagram of the optical path and equipment installation of the object under test at position R of the present invention.

[0016] Figure 4 It is a schematic diagram of the internal structure of the cylindrical lens barrel of the present invention.

[0017] In the figure: 1. laser transmitter; 2. object to be measured; 3. first reflector; 4. imaging lens; 5. support seat; 6. second reflector; 7. photosensitive target surface; 8. cylindrical lens barrel; 9. round hole; 10. adjustment slot; 11. threaded hole; 12. limit slot; 13. rotating shaft; 14. laser beam; 15. irradiation point; 16. first reflection line; 17. first reflection point; 18. first folding line; 19. second reflection line; 20. optical center; 21. second reflection point; 22. second folding line; 23. third reflection line; 24. imaging point. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-4 The present invention provides a technical solution: a distance measuring optical system, comprising a laser emitter 1, an object to be measured 2, a first reflector 3, an imaging lens 4, a support seat 5, a second reflector 6 and a photosensitive target surface 7; an XYZ three-dimensional coordinate system is established with the laser emitter 1 as the origin; the emission direction of the laser emitter 1 is the same as the positive direction of the Y axis or forms an inclined angle with the positive direction of the Y axis; the laser beam 14 is located on the YZ plane; the laser emitter 1 emits the laser beam 14; the laser beam 14 irradiates the object to be measured 2 placed on the positive direction of the Y axis to form an irradiation point 15; the laser beam 14 is reflected by the irradiation point 15 to form a first reflection line 16; the plane where the first reflection line 16 is located is the first optical path plane; the intersection of the first optical path plane and the reflection surface of the first reflector 3 constitutes a first folding line 18; the first optical path plane is located on the XY plane; the first reflection line 16 irradiates the reflection surface at the bottom of the first reflector 3 to form a first reflection point 17 ; The bottom reflection surface of the first reflector 3 is set at an angle of forty-five degrees with the XZ plane; the first reflection line 16 is reflected through the first reflection point 17 to form the second reflection line 19; the plane where the second reflection line 19 and the Z axis of the coordinate system are located is the second optical path plane; the intersection of the second optical path plane and the reflection surface of the second reflector 6 constitutes the second folding line 22; the second optical path plane is located on the XZ plane; the second reflection line 19 irradiates the optical center 20 at the center of the imaging lens 4;; the second reflection line 19 passes through the imaging lens 4 and irradiates the second reflector 6 to form a second reflection point 21; the second reflector 6 is installed on the inclined surface of the support seat 5; the second reflection line 19 is reflected through the second reflection point 21 to form a third reflection line 23; the plane where the third reflection line 23 is located is the third optical path plane; the third optical path plane is perpendicular to the XZ plane; the third reflection line 23 is irradiated onto the photosensitive target surface 7 located above the XZ plane to form an imaging point 24.

[0020] As attached Figure 1-3 As shown, L1, L2, and L3 are the distances between the three objects to be measured and the origin from near to far; P, Q, and R are the different measurement points corresponding to the three objects to be measured. Figure 2 The Q point shown falls exactly on the principal optical axis of the lens. Figure 1 Point P in Figure 3Point R in the figure is located outside the main optical axis, and a rotating shaft 13 is fixedly connected and installed between the laser emitter 1 and the first reflector 3; the laser emitter 1, the first reflector 3 and the rotating shaft 13 are arranged side by side in the X-axis direction; an imaging lens 4 is embedded and installed on the side of the cylindrical barrel 8; a circular hole 9 is provided on the upper surface of the cylindrical barrel 8; a cylindrical support seat 5 is installed at the bottom of the circular hole 9; an adjustment notch 10 is provided on the lower surface of the support seat 5; a threaded hole 11 is provided on the side of the support seat 5; a limiting groove 12 is provided on the lower side wall of the cylindrical barrel 8; the central axis of the cylindrical barrel 8 is perpendicular to the XZ plane of the coordinate system; the upper surface of the support seat 5 is processed and set to a forty-five-degree inclined surface; the second reflector 6 is fixedly installed on the upper surface of the support seat 5; the photosensitive target surface 7 is arranged just above the circular hole; a screwdriver or other adjustment tool can be inserted into the adjustment notch 10 of the cylindrical barrel 7 to adjust its azimuth angle.

[0021] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distance measuring optical system, Features: The invention comprises a laser emitter (1), an object to be measured (2), a first reflector (3), an imaging lens (4), a support seat (5), a second reflector (6) and a photosensitive target surface (7); the laser emitter (1) emits a laser beam (14); an XYZ three-dimensional coordinate system is established with the laser emitter (1) as the origin; the emission direction of the laser emitter (1) is the same as the positive direction of the Y axis or forms an inclined angle with the positive direction of the Y axis; the laser beam (14) is located on the YZ plane; the laser beam (14) is irradiated onto the object to be measured (2) placed in the positive direction of the Y axis to form an irradiation point (15); the laser beam (14) is reflected by the irradiation point (15) to form a first reflection line (16); the laser beam (14) and the plane where the first reflection line (16) is located is the first optical path plane; the first optical path plane is located on the XY plane; the bottom reflection surface of the first reflector (3) is set at a forty-five degree angle with the XZ plane; the first reflection line (16) is irradiated onto the reflection surface at the bottom of the first reflector (3) to form a first reflection point (17); the first reflection line (16) is reflected by the first reflection point (17) to form a second reflection line (19); the plane where the second reflection line (19) and the Z axis of the coordinate system are located is the second optical path plane; the second optical path plane is located on the XZ plane; the second reflection line (19) irradiates the optical center at the center of the imaging lens (4) (20); the second reflected light (19) passes through the imaging lens (4) and is irradiated on the second reflector (6) to form a second reflection point (21); the second reflector (6) is mounted on the inclined surface of the support seat (5); the second reflected light (19) is reflected through the second reflection point (21) to form a third reflected light (23); the plane where the third reflected light (23) is located is a third optical path plane; the third reflected light (23) is irradiated on a photosensitive target surface (7) located above the XZ plane to form an imaging point (24); a rotating shaft (13) is fixedly connected between the laser emitter (1) and the first reflector (3); the rotation axis of the rotating shaft (13) is aligned with the first reflector (3); The reflecting surface of the optical mirror (3) is in the same plane and parallel to the X-axis; the laser emitter (1), the rotating shaft (13), and the first reflector (3) are arranged side by side in the X-axis direction; the support seat (5) is sleeved with a cylindrical lens barrel (8) on the outside; an imaging lens (4) is embedded and installed on the side of the cylindrical lens barrel (8); a circular hole (9) is opened on the upper surface of the cylindrical lens barrel (8); a cylindrical support seat (5) is installed at the bottom of the circular hole (9); an adjustment notch (10) is opened and processed on the lower surface of the support seat (5); a threaded hole (11) is opened on the side of the support seat (5); and a limit groove (12) is opened on the lower side wall of the cylindrical lens barrel (8).

2. A distance measuring optical system according to claim 1, Features: The intersection line of the first optical path plane and the reflecting surface of the first reflector (3) forms a first folding line (18); the first folding line (18) is located on the bottom surface of the first reflector (3) and runs parallel to the X-axis of the coordinate system.

3. A distance measuring optical system according to claim 1, Features: The intersection line of the second optical path plane and the reflection surface of the second reflector (6) forms a second folding line (22); the second folding line (22) is located on the upper inclined plane of the second reflector (6) and its direction forms an inclined angle with the X-axis of the coordinate system.

4. A distance measuring optical system according to claim 3, Features: The central axis of the cylindrical lens barrel (8) is perpendicular to the XZ plane of the coordinate system; the upper surface of the support seat (5) is processed to be an inclined surface at a degree of forty-five; and the photosensitive target surface (7) is arranged directly above the circular hole.

5. A distance measuring optical system according to claim 3, Features: The adjustment notch (10) is in the shape of a straight groove.

6. A distance measuring optical system according to claim 3, Features: The third optical path plane is perpendicular to the XZ plane.

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