Distance measuring sensor
By introducing adjustable thread ring and specular reflection technology into the triangular ranging laser displacement sensor, the problem of the sensor being unable to be miniaturized is solved, and the optical path length is reduced and the measurement accuracy is maintained.
Patent Information
- Application Number
- CN202421161339.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-05-24
AI Technical Summary
The existing triangular ranging laser displacement sensor cannot be adjusted separately because the focus of the laser beam convergence path cannot be achieved to reduce the length of the axial optical path, thus limiting the miniaturization of the device.
By introducing an adjustable threaded ring into the sensor, the distance between the transmitting lens and the transmitting PCBA plate is adjustable, focusing adjustment is achieved, and the axial optical path length is reduced by specular reflection in the receiver device.
The optical path length and overall size are reduced under the same image distance conditions, which is conducive to the miniaturization of sensors and ensures measurement accuracy.
Smart Images
Figure CN222838188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sensors, in particular to a distance measuring sensor. Background Art
[0002] Measuring the distance of a target has a wide range of needs and applications in various fields. Distance measurement within a few meters usually adopts the principle of optical triangulation. The reason is that triangulation can obtain higher distance measurement accuracy over a short distance. Compared with measuring the distance of a single point, it can quickly measure the distance of multiple points and provide more powerful functions. Therefore, laser displacement sensors for triangulation distance measurement came into being.
[0003] The existing triangulation laser displacement sensor is generally composed of a laser diode, a laser beam focusing lens, an imaging lens group and a detector. Its characteristic is that there is an angle between the laser beam focusing optical path and the imaging detection optical path. When the position of the object surface changes, the image formed on the detector also moves accordingly. Through the relationship between image shift and actual displacement, the actual object displacement can be obtained by detecting and calculating the image shift.
[0004] However, due to the technical characteristics that the distance between the laser diode and the laser beam converging lens is fixed, the focus of the laser beam converging light path cannot be adjusted individually. Under the same image distance conditions, it is impossible to achieve the purpose of reducing the axial optical path length and thus reducing the overall size, which limits the miniaturization development of the device. Utility Model Content
[0005] The purpose of the utility model is to provide a distance measuring sensor to solve the problems raised in the above background technology.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A distance measuring sensor, comprising:
[0008] A base, the base comprising a mounting seat Ib and a mounting seat IIa integrated with the mounting seat Ib;
[0009] An emitting device, the emitting device is mounted on the mounting seat Ib, and the emitting device includes an emitting PCBA board and an emitting lens;
[0010] A receiving device, wherein the receiving device is mounted on the mounting seat IIa;
[0011] The transmitting lens can be moved relative to the transmitting PCBA board for focusing adjustment;
[0012] The transmitting PCBA board is used to emit light, which is focused by the transmitting lens and irradiated on the object to be measured. The object to be measured reflects the light spot, and the receiving device is used to receive the reflected light spot.
[0013] Preferably, the optical axes of the emitting PCBA board and the emitting lens coincide with each other.
[0014] Preferably, the transmitting PCBA board is fixed on the mounting seat Ib by fixing bolts, and the transmitting lens is threadedly mounted on the mounting seat Ib by an adjustable thread ring a.
[0015] Preferably, an optical axis hole d for light to pass through is provided on the mounting seat Ib.
[0016] Preferably, the transmitting lens and the receiving device are located on the same side.
[0017] Preferably, the receiving device comprises a receiving lens, a metal-coated reflector and a receiving array PCBA board, wherein the metal-coated reflector and the transmitting lens are located on the same side.
[0018] Preferably, the receiving lens, the metal-coated reflector and the receiving array PCBA board are distributed in a triangular shape.
[0019] Preferably, the reflected light spot is reflected by the mirror surface of the metal-coated reflector through the receiving lens, and finally received by the receiving array PCBA board.
[0020] Preferably, the receiving array PCBA board is fixed on the mounting seat IIa by fixing bolts.
[0021] Preferably, the mounting seat Ib and the mounting seat IIa are provided with base fixing gaskets with mounting holes c.
[0022] Compared with the prior art, the beneficial effects of the utility model are:
[0023] The utility model has an emitting optical axis of an emitting lens and a receiving optical axis of a receiving lens in the same plane and at a certain angle to each other. The distance of the measured object is calculated by the triangular relationship between the reflected light spot and the received light spot relative to the receiving lens. This is a non-contact measurement. The measured object is not affected by any measuring force from the sensor, and will not cause deformation or position change of the measured object.
[0024] The utility model can adjust the distance between the transmitting lens and the transmitting PCBA board through the adjustable thread ring, has a simple structure, is easy to process, and can accurately adjust the focus.
[0025] The utility model has a transmitting optical axis and a receiving optical axis in the same plane, a lens focal length, and a receiving surface window opening that are relatively large, thus meeting relatively large measurement requirements.
[0026] The utility model has a receiving optical path, which is composed of a receiving lens and a reflective mirror with a coating on the reflecting surface. Through mirror reflection, under the condition of the same image distance, the axial optical path length is reduced, the overall size is reduced, and the miniaturization development of the sensor is beneficial. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 This is a structural diagram of a distance measurement sensor according to an exemplary embodiment of the present utility model.
[0029] Figure 2 An exemplary embodiment of the present invention Figure 1 Rear view of.
[0030] Figure 3 An exemplary embodiment of the present invention Figure 1 Right view of .
[0031] Figure 4 An exemplary embodiment of the present invention Figure 3 Schematic diagram of the cross-section at AA in the middle.
[0032] In the figure: 1-base, 1a-mounting seat II, 1b-mounting seat I, 1c-mounting hole, 1d-optical axis hole, 1e-receiving surface window, 2-transmitting lens, 2a-adjustable threaded ring, 2b-notch, 3-receiving lens, 4-metal-coated reflector, 5-transmitting PCBA board, 6-receiving array PCBA board, 7-fixing bolt, 8-hollow, 9-groove. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0036] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0039] See also Figures 1 to 4 , the utility model provides a technical solution:
[0040] A distance measuring sensor, comprising:
[0041] A base 1, wherein the base 1 comprises a mounting seat Ⅰ1b and a mounting seat Ⅱ1a integrated with the mounting seat Ⅰ1b;
[0042] An emitting device, the emitting device is mounted on the mounting seat Ⅰ1b, and the emitting device includes an emitting PCBA board 5 and an emitting lens 2;
[0043] A receiving device, wherein the receiving device is mounted on the mounting seat II1a;
[0044] The transmitting lens 2 can be moved relative to the transmitting PCBA board 5 for focusing adjustment;
[0045] The transmitting PCBA board 5 is used to emit light (ie, the emitted light described below), which is focused by the transmitting lens 2 and irradiated onto the object to be measured. The object to be measured reflects the light spot, and the receiving device is used to receive the reflected light spot.
[0046] In a specific embodiment, if Figure 4 As shown, the optical axes of the emitting PCBA board 5 and the emitting lens 2 coincide with each other, and the focal length of the emitting lens 2 is .
[0047] In a specific embodiment, if Figure 1 and Figure 4As shown, the emission PCBA board 5 is fixed on the mounting seat Ⅰ1b by a fixing bolt 7, and the emission lens 2 is threadedly mounted on the mounting seat Ⅰ1b by an adjustable thread ring 2a. By adjusting the fixing bolt 7, the emission PCBA board 5 mounted on the mounting seat Ⅰ1b is adjusted, and the direction of the optical axis of the emitted light can be fine-tuned.
[0048] In a specific embodiment, if Figure 1 and Figure 4 As shown, the distance between the transmitting lens 2 and the transmitting PCBA board 5 can be adjusted by threading through the adjustable thread ring 2a, which has a simple structure, convenient processing, and accurate focus adjustment. The adjustable thread ring 2a is screwed into the mounting seat Ⅰ1b, and then a part of the transmitting lens 2 is sleeved in the mounting seat Ⅰ1b and connected to the adjustable thread ring 2a. The two can be relatively sleeved and rotated, or fixedly connected. The adjustable thread ring 2a has a notch 2b. When a tool such as a flat screwdriver is inserted into the notch 2b, the adjustable thread ring 2a can be adjusted to drive the transmitting lens 2 to move forward and backward in the axial direction, so that the front and back adjustments can be made to achieve focus adjustment.
[0049] In a specific embodiment, if Figure 4 As shown, the mounting seat Ⅰ1b is provided with an optical axis hole 1d for light to pass through, so as to facilitate the light emitted by the PCBA board 5 to pass through.
[0050] In a specific embodiment, if Figure 3 As shown, the transmitting lens 2 and the receiving device are located on the same side, that is, Figure 3 On the base 1 on the middle right.
[0051] In a specific embodiment, if Figure 1 or Figure 3 As shown, the receiving device includes a receiving lens 3, a metal-coated reflector 4 and a receiving array PCBA board 6, wherein the metal-coated reflector 4 and the transmitting lens 2 are located on the same side, and the receiving lens 3, the metal-coated reflector 4 and the receiving array PCBA board 6 are distributed in a triangular shape, and the reflected light spot is reflected by the mirror surface of the metal-coated reflector 4 through the receiving lens 3, and finally received by the receiving array PCBA board 6, and the receiving array PCBA board 6 is fixed on the mounting seat II1a by fixing bolts 7. The mounting seat II1a has a receiving surface window 1e, and the receiving lens 3 is located on the receiving surface window 1e, and the mounting seat II1a is in a triangular shape.
[0052] In a specific embodiment, if Figure 3 As shown, the mounting seat Ⅰ1b and the mounting seat Ⅱ1a are equipped with a base fixing gasket with a mounting hole 1c. The base 1 has a hollow 8 and a groove 9, which can reduce the overall weight of the sensor and facilitate miniaturization and lightweight. The base fixing gasket makes it easy to install and use the sensor in combination with other components.
[0053] In a specific embodiment, the technical feature of the sensor is based on the principle of triangulation distance measurement. The emitting optical axis of the emitting lens 2 and the receiving optical axis of the receiving lens 3 are in the same plane and form a certain angle with each other. The distance of the object to be measured is calculated through the triangular relationship between the reflected light spot and the received light spot relative to the receiving lens 3. This is a non-contact measurement. The object to be measured is not affected by any measuring force from the sensor, and will not cause deformation or position change of the object to be measured.
[0054] In a specific embodiment, the receiving device, as one side of the receiving optical path, is composed of a receiving lens 3, a metal-coated reflector 4 and a receiving array PCBA board 6. Through mirror reflection, under the same image distance condition, the axial optical path length is reduced and the overall size is reduced.
[0055] In a specific embodiment, the emitting device, as one side of the emitting light path, is composed of an emitting lens 2 and an emitting PCBA board 5. The focus and emitting direction of the emitted light can be adjusted separately, and the overall structure is compact and small.
[0056] In a specific embodiment, the transmitting tube is mounted on a small transmitting PCBA board 5, which is fixed to the base 1 by fixing bolts 7 and can be slightly adjusted in a direction perpendicular to the transmitting optical axis to compensate for part processing deviations and deflection of the transmitting optical axis caused by assembly errors.
[0057] In a specific embodiment, the adjustment of the optical axis direction of the emitted light does not affect the fixed position of the emitting lens, and the optical axis deflection adjustment and the focus adjustment are independent of each other and do not interfere with each other.
[0058] In a specific embodiment, the emitting optical axis and the receiving optical axis are in the same plane, the focal length of the lens and the angle of the optical axis are designed, and the receiving surface window 1e has a larger opening to meet larger measurement requirements.
[0059] The present utility model, the undescribed parts are prior art.
[0060] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.
Claims
1. A distance measuring sensor, characterized in that: include: A base (1), the base (1) comprising a mounting seat I (1b) and a mounting seat II (1a) integrated with the mounting seat I (1b); An emitting device, the emitting device being mounted on a mounting seat I (1b), and comprising an emitting PCBA board (5) and an emitting lens (2); A receiving device, wherein the receiving device is mounted on the mounting seat II (1a); The transmitting lens (2) is movable relative to the transmitting PCBA board (5) for focusing adjustment; The transmitting PCBA board (5) is used to emit light, which is focused by the transmitting lens (2) and irradiated onto the object to be measured. The object to be measured reflects the light spot, and the receiving device is used to receive the reflected light spot.
2. A distance measuring sensor according to claim 1, characterized in that: The optical axes of the emitting PCBA board (5) and the emitting lens (2) coincide with each other.
3. A distance measuring sensor according to claim 1, characterized in that: The transmitting PCBA board (5) is fixed on the mounting seat I (1b) by means of fixing bolts (7), and the transmitting lens (2) is threadedly mounted on the mounting seat I (1b) by means of an adjustable threaded ring (2a).
4. A distance measuring sensor according to claim 3, characterized in that: The mounting seat I (1b) is provided with an optical axis hole (1d) for light to pass through.
5. A distance measuring sensor according to claim 1, characterized in that: The transmitting lens (2) and the receiving device are located on the same side.
6. A distance measuring sensor according to claim 1, characterized in that: The receiving device comprises a receiving lens (3), a metal-coated reflector (4) and a receiving array PCBA board (6), wherein the metal-coated reflector (4) and the transmitting lens (2) are located on the same side.
7. A distance measuring sensor according to claim 6, characterized in that: The receiving lens (3), the metal-coated reflector (4) and the receiving array PCBA board (6) are distributed in a triangular shape.
8. A distance measuring sensor according to claim 7, characterized in that: The reflected light spot is reflected by the mirror surface of the metal-coated reflector (4) through the receiving lens (3), and is finally received by the receiving array PCBA board (6).
9. A distance measuring sensor according to claim 7, characterized in that: The receiving array PCBA board (6) is fixed on the mounting seat II (1a) by means of fixing bolts (7).
10. A distance measuring sensor according to claim 1, characterized in that: The mounting seat I (1b) and the mounting seat II (1a) are equipped with a base fixing gasket with a mounting hole (1c).