Laser displacement sensor

Abstract

The utility model provides a laser displacement sensor. The laser displacement sensor comprises a housing; the optical base is arranged in the shell, and a light projection base and a light receiving base are integrally formed on the optical base; the light projection part is fixed on the light projection seat; the light receiving part comprises a light receiving substrate and a light sensing element arranged on the light receiving substrate, the light receiving seat comprises a groove matched with the light receiving substrate, and the light receiving substrate is inserted into the groove in the mode that the position can be adjusted only in the depth direction of the groove; the photosensitive element is provided with a slender photosensitive area. According to the laser displacement sensor provided by the utility model, light receiving spots formed by reflection of an object can be kept incident to the photosensitive area through the elongated photosensitive area and the pixel points arranged in the photosensitive area in a narrow form, so that light receiving adjustment can be completed only by adjusting the position of the light receiving substrate in the depth direction of the groove; and meanwhile, the light projection part is fixedly arranged and does not need to be adjusted, so that the assembly working hours are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of sensors, specifically a laser displacement sensor. Background Technology

[0002] Laser displacement sensors measure distance by emitting and receiving laser light reflected from objects. A laser displacement sensor includes a light-emitting section for emitting the laser and a light-receiving section for receiving the reflected laser light, and it measures distance based on the principle of triangulation. To ensure accurate measurement results, the light-emitting and light-receiving sections of the laser displacement sensor require separate adjustments for light emission and reception, respectively.

[0003] When adjusting the light projection of the projection section, the size of the projection spot needs to be ensured to guarantee the size of the pixel occupied by the light received by the photosensitive element in the light-receiving section. Currently, the size of the projection spot is adjusted by placing the projection lens in a movable structure and adjusting the distance between the projection lens and the light source by moving the position of the projection lens back and forth.

[0004] When adjusting the light-receiving part, the reflected light from near and far objects differs, causing the reflected light spot to shift in the left-right direction. To ensure the light spot is received by the photosensitive element, the photosensitive element needs to be adjusted accordingly in the left-right direction. Furthermore, due to manufacturing and installation errors in the original optical design, the photosensitive element's installation position may deviate from the ideal point. Additionally, if the near and far points are not properly adjusted, the light spot received by the photosensitive element will not exhibit the ideal waveform, requiring adjustment of the photosensitive element in the front-back direction. Moreover, the vertical position of the light spot on the photosensitive element affects the change in the received light waveform, thus affecting measurement accuracy; therefore, vertical adjustment of the photosensitive element is also necessary.

[0005] Therefore, in order to ensure the position of the light spot on the photosensitive element, the position of the photosensitive element needs to be adjusted up and down, left and right, and front and back in the existing laser displacement sensor so that the light spot corresponds to the ideal photosensitive position of the photosensitive element. It takes a lot of time to adjust the light reception and also a lot of time to adjust the light projection, resulting in a long assembly time. Utility Model Content

[0006] To address the above problems, this utility model provides a laser displacement sensor that eliminates the need for adjustment of the light-projecting part, while the light-receiving part only requires adjustment in one direction, effectively reducing assembly time.

[0007] This utility model discloses a laser displacement sensor, including a housing and an optical base disposed inside the housing. The optical base is integrally formed with a light-projecting base and a light-receiving base.

[0008] The projection section is integrated with the projection base;

[0009] The light-receiving part includes a light-receiving substrate and a photosensitive element disposed on the light-receiving substrate. The light-receiving base includes a groove that matches the light-receiving substrate. The light-receiving substrate is inserted into the groove in such a way that its position can be adjusted only in the depth direction of the groove.

[0010] The photosensitive element has a long and narrow photosensitive area.

[0011] According to the above technical solution, by having a long and narrow photosensitive area, the light spot formed by the reflection of the object can be kept incident on the photosensitive area. Therefore, the light receiving adjustment can be completed simply by adjusting the position of the light receiving substrate in the depth direction of the groove, which effectively reduces the time required for light receiving adjustment and reduces assembly time.

[0012] Optionally, the aspect ratio of the photosensitive area is 32:1-64:1, preferably 64:1.

[0013] Optionally, the photosensitive area has narrow, elongated pixels arranged along its long side.

[0014] According to the above technical solution, by setting the pixels to a narrow and elongated form, the number of pixels that can be accommodated in the photosensitive area can be effectively increased, thereby further ensuring that the light spot can remain incident on the photosensitive area.

[0015] Optionally, the aspect ratio of the pixels is 8:1-24:1, preferably 12:1.

[0016] Optionally, the projection unit includes a projection element and a projection lens, with the projection element and projection lens respectively fixedly mounted at both ends of the projection base.

[0017] According to the above technical solution, the projection unit is fixedly installed in the projection base, eliminating the need for projection adjustment and further reducing assembly time.

[0018] Optionally, the light-receiving part also includes a light-receiving lens and a reflector, which are mounted on an optical base to focus and reflect the light incident through the light-receiving lens to the photosensitive element.

[0019] Optionally, the optical base is provided with a first through hole and a second through hole, and the housing is provided with a first mounting hole and a second mounting hole. The first through hole and the first mounting hole are correspondingly provided, and the second through hole and the second mounting hole are correspondingly provided, and the optical base is fixed to the housing by screws.

[0020] According to the above technical solution, the connection and installation between the optical base and the housing can be quickly completed by using screws. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of the laser displacement sensor in an embodiment of this utility model;

[0022] Figure 2 This is a top view of the laser displacement sensor in an embodiment of the present invention;

[0023] Figure 3 This is a side view of the projection section in an embodiment of the present invention.

[0024] Figure 4 This is a top-view cross-sectional view of the light-projecting part in an embodiment of this utility model.

[0025] Figure 5 This is a schematic diagram of the optical base in an embodiment of the present invention;

[0026] Figure 6 This is an exploded view of the optical base in an embodiment of this utility model;

[0027] Figure 7 This is a schematic diagram showing the location of the photosensitive area in an embodiment of this utility model;

[0028] Figure 8 This is an enlarged schematic diagram of the photosensitive area in an embodiment of this utility model.

[0029] Reference numerals: laser displacement sensor 100, housing 10, first mounting hole 101, optical base 20, first through hole 201, second through hole 202, projection base 21, projection element 211, projection lens 212, light receiving base 22, groove 221, light receiving substrate 23, photosensitive element 24, photosensitive area 241, pixel 2411, measurement area 2412, margin area 2413, light receiving lens 25, reflector 26. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Figure 1 This is a schematic diagram of the structure of the laser displacement sensor in an embodiment of this utility model.

[0032] like Figure 1 As shown, the laser displacement sensor 100 of this embodiment includes a housing 10, an optical base 20, and a light-emitting part and a light-receiving part disposed in the optical base 20.

[0033] refer to Figure 2 The optical base 20 is disposed inside the housing 10, and the optical base 20 is integrally formed with a light-projecting base 21 and a light-receiving base 22.

[0034] Specifically, the optical base 20 is provided with a first through hole 201 and a second through hole 202, and the housing 10 is provided with a first mounting hole 101 and a second mounting hole (not shown in the figure). The first through hole 201 is correspondingly provided with the first mounting hole 101, and the second through hole 202 is correspondingly provided with the second mounting hole. The optical base 20 is fixed to the housing 10 by screws. The installation by screws can quickly complete the fixed connection between the housing 10 and the optical base 20.

[0035] Furthermore, the first through hole 201 is located between the light-projecting base 21 and the light-receiving base 22 and is set close to the light-projecting base 21, and the second through hole 202 is located in the light-receiving part, so that the corresponding positions of the light-projecting part and the corresponding positions of the light-receiving part at both ends of the optical base 20 are fixed, further ensuring that the optical base 20 as a whole can be stably connected to the housing 10 after being fixed with screws.

[0036] The projection unit is integrated with the projection base 21. (Reference) Figure 3 and Figure 4 The projection section includes a projection element 211 and a projection lens 212, which are respectively fixedly disposed at both ends of the projection base 21.

[0037] Specifically, the projection element 211 is an LD projection element. The projection element 211 and the projection lens 212 are fixedly mounted in the projection base 21, which is integrally formed with the optical base 20, by matching their shapes to corresponding mounting slots, and remain on the same optical axis, saving some collimation components. The laser emitted by the projection element 211 will be collimated and emitted through the center of the projection lens 212. Simultaneously, the projection element 211 and the projection lens 212 are respectively located at both ends of the projection base 21 and inside the projection base 21, which protects the projection element 211 and the projection lens 212 and ensures the stability of the emitted laser.

[0038] In this embodiment, by directly mounting the light-emitting element 211 and the light-emitting lens 212 in the light-emitting base 21 which is integrally formed with the optical base 20, the number of structural components of the light-emitting part is effectively reduced and the assembly time of the light-emitting part is reduced.

[0039] refer to Figure 5 and Figure 6 The light-receiving part includes a light-receiving substrate 23 and a photosensitive element 24 disposed on the light-receiving substrate 23. The light-receiving base 22 includes a groove 221 that matches the light-receiving substrate 23. The light-receiving substrate 23 is inserted into the groove 221 in such a way that its position can be adjusted only in the depth direction of the groove 221.

[0040] Specifically, the light-receiving substrate 23 is inserted into the groove 221, and the height of the light-receiving substrate 23 is lower than the depth of the groove 221, which facilitates the position adjustment of the light-receiving substrate 23 in the depth direction of the groove 221. At the same time, by adjusting the insertion position of the light-receiving substrate 23 in the depth direction of the groove 221, the position of the photosensitive element 24 can be adjusted, so that the photosensitive area 241 reaches the ideal optical position.

[0041] The photosensitive element 24 has an elongated photosensitive area 241. The aspect ratio of the photosensitive area 241 is 32:1 to 64:1, preferably 64:1.

[0042] In this embodiment, the photosensitive element 24 is a CMOS chip. Specifically, refer to... Figure 7 and Figure 8 In this embodiment, the photosensitive element 24 is provided with an elongated photosensitive area 241, and a plurality of narrow and elongated pixels 2411 are arranged in the photosensitive area 241.

[0043] The aspect ratio of the pixel 2411 is 8:1-24:1, preferably 12:1, and multiple pixels 2411 are arranged along the length of the photosensitive area 241.

[0044] Specifically, the elongated photosensitive area 241 has a long photosensitive range in the left and right directions. Therefore, even if the position of the light spot incident on the photosensitive area 241 is deviated due to the distance of the object or due to manufacturing and installation errors, the light spot can still remain in the photosensitive area 241.

[0045] Furthermore, the photosensitive area 241 includes a measurement area 2412 located in the middle and margin areas 2413 located on both sides of the measurement area. The measurement area 2412 is the actual light-receiving measurement range in the photosensitive area. By setting the pixel 2411 to a narrow and elongated form, the width of a single pixel 2411 is reduced, thereby allowing more pixels 2411 to be accommodated in the overall photosensitive area. The number of pixels 2411 that can be sampled for light increases. While ensuring that margin areas 2413 are left on both sides, the measurement area 2412 has enough pixels 2411 for light sampling. This further ensures that the CMOS chip does not need to be adjusted left and right or front and back, but only up and down, that is, adjusting the insertion position of the light-receiving substrate 23 in the depth direction of the groove 221 to complete the light-receiving adjustment.

[0046] All three light spots—near spot A, mid spot B, and far spot C—can be received by pixels 2411 in the measurement area 2412. Near spot A, reflected from an object at a near position, will be located on the left side of the measurement area 2411, with a single pixel length Y: near spot length Y2 ≈ 1:7. Mid spot B, reflected from an object at a mid position, will be located in the middle of the measurement area 2411, with a single pixel length Y: mid spot length Y1 ≈ 1:3. Far spot C, reflected from an object at a far position, will be located on the right side of the measurement area 2411, with a single pixel length Y: far spot length Y3 ≈ 1:9. The CMOS chip only needs to be adjusted vertically to position pixel 2411 in the middle of the light spot to complete the light reception adjustment, effectively reducing assembly time.

[0047] The light-receiving part also includes a light-receiving lens 25 and a reflector 26, which are mounted on the optical base 20 to focus and reflect the light incident through the light-receiving lens 25 to the photosensitive element 24.

[0048] Specifically, the light-receiving part is hollow, and a light-receiving lens 25 is provided on the same side as the projection lens 212. The reflector 26 is positioned in the light-emitting direction of the light-receiving lens 25 and is tilted at an angle to the light-receiving lens 25. The optical base 20 has corresponding mounting holes for the light-receiving lens 25 and the reflector 26 for fixed mounting. The light emitted by the projection part is reflected by the object and then converged by the light-receiving lens 25 to the reflector 26, and then reflected by the reflector 26 to the photosensitive element 24.

[0049] In the laser displacement sensor 100 of this invention, the photosensitive element 24 has an elongated photosensitive area 241 and pixels 2411 arranged in a narrow and elongated manner within the photosensitive area 241. Light reception adjustment can be completed simply by adjusting the insertion position of the light-receiving substrate 23 in the depth direction of the groove 221, effectively reducing assembly time. Simultaneously, the light-projecting element 211 and the light-projecting lens 212 are fixedly mounted on the light-projecting base 21, eliminating the need for light projection adjustment and further reducing assembly time. Furthermore, the laser displacement sensor 100 integrates the light-projecting element 211, the light-projecting lens 212, the light-receiving substrate 23, the photosensitive element 24, the light-receiving lens 25, and the reflector 26 into a single unit via the optical base 20 and the light-projecting base 21 and the light-receiving base 22 integrally formed with the optical base 20. This ensures the stability of the optical system within the optical base 20 and results in a compact structure.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laser displacement sensor characterized by, Comprise: A shell; An optical base arranged in the shell, the optical base being integrally formed with a light-emitting base and a light-receiving base; A light-emitting part combined with the light-emitting base; A light-receiving part comprising a light-receiving substrate and a photosensitive element arranged on the light-receiving substrate, the light-receiving base comprising a groove matched with the light-receiving substrate, the light-receiving substrate being inserted into the groove in a position-adjustable manner only in the depth direction of the groove; The photosensitive element has an elongated photosensitive area.

2. The laser displacement sensor according to claim 1, characterized by, The aspect ratio of the photosensitive area is 32:1-64:

1.

3. The laser displacement sensor according to claim 1, characterized by, Pixel points in a narrow and long form are arranged along the long side direction in the photosensitive area.

4. The laser displacement sensor according to claim 3, characterized by The aspect ratio of the pixel points is 8:1-24:

1.

5. The laser displacement sensor according to claim 1, characterized by, The light-emitting part comprises a light-emitting element and a light-emitting lens, which are respectively fixedly arranged at both ends of the light-emitting base.

6. The laser displacement sensor according to claim 1, characterized by, The light-receiving part further comprises a light-receiving lens and a mirror, which are mounted on the optical base, focus and reflect light incident through the light-receiving lens to the photosensitive element.

7. The laser displacement sensor according to claim 1, wherein, The optical base is provided with a first through hole and a second through hole, the shell is provided with a first mounting hole and a second mounting hole, the first through hole is correspondingly arranged with the first mounting hole, and the second through hole is correspondingly arranged with the second mounting hole and fixed to the shell by screwing.

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