Laser ranging module and height measuring instrument

Abstract

The utility model discloses a laser ranging module and height measuring instrument, including the casing that is used for shielding laser, also including light-transmitting cover plate, ranging circuit board and lens, the casing has first mounting groove, second mounting groove, emission channel and receiving channel, ranging circuit board is assembled in the first mounting groove, and the lens is assembled in the second mounting groove. The cover plate is embedded in the second mounting groove and forms sealing fit, the cover plate abuts against channel openings of the transmitting channel and the receiving channel, a laser transmitting part and a laser receiving part are packaged on a laser ranging chip of the ranging circuit board, the laser transmitting part corresponds to the transmitting channel, the laser receiving part corresponds to the receiving channel, and a lens is assembled in the transmitting channel. Laser emission and laser receiving are integrated on the same laser ranging chip, and an irradiation field and a field angle of the laser ranging chip are both within a preset specification range, so that re-calibration and assembly are not needed before use, rapid and accurate height measurement is realized, the structure is simple, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of height measurement, in particular to a laser distance measuring module and a height measuring instrument. Background Art

[0002] Height is an indicator of healthy development and is valued by many parents. Height measuring instruments often use mechanical scales to measure height. If used in hospitals and other application scenarios, the pressure plate must be manually operated and the value must be read with the eyes, and there must be contact with the person being measured, which brings the risk of cross infection.

[0003] In recent years, ultrasonic height meters based on ultrasonic ranging have appeared, but they also have the disadvantage of a large ultrasonic divergence angle. When used, they require no obstacles around, otherwise there will be significant interference, resulting in low measurement accuracy.

[0004] In addition, some height measuring instruments use laser ranging. The working principle is that the light emitting module (i.e., the emitting unit) emits a light beam (such as an infrared laser), and the lens is located on the optical path of the light emitting module. The light beam collimated by the lens is emitted to the surface of the person being measured, and then the light beam is reflected to the receiving chip (i.e., the receiving unit) and calculated based on the time of flight method (i.e., TOF) to determine the height of the person being measured.

[0005] However, its transmitting unit and receiving unit are independent discrete devices, which makes the overall structure complex and costly. In addition, it needs to be assembled and calibrated in advance before use, which makes operation inconvenient. Utility Model Content

[0006] Therefore, in order to solve the above problems, the utility model provides a laser ranging module and a height measuring instrument, which not only integrates laser emission and laser reception on the same laser ranging chip to avoid re-assembly and calibration during use, but also has a simple structure and is easy to operate.

[0007] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0008] The utility model provides a laser ranging module, comprising a shell for shielding laser, and also comprising a light-transmitting cover plate, a ranging circuit board with a laser ranging chip, and a lens for adjusting the irradiation field of the laser emitted by the laser ranging chip; the shell has a first mounting groove and a second mounting groove which are arranged in an upper and lower manner and spaced from each other, and a transmitting channel and a receiving channel located between the first mounting groove and the second mounting groove, one end of the transmitting channel and the receiving channel are both connected to the first mounting groove, and the other end is both connected to the second mounting groove; the first mounting groove is located in the shell, and the outer wall of the shell is provided with a mounting groove opening which passes through the second mounting groove; the ranging circuit board is assembled in the first mounting groove, the cover plate passes through the mounting groove opening, and then is embedded in the second mounting groove to form a sealing fit, and the cover plate abuts against the channel openings of the transmitting channel and the receiving channel; the laser ranging chip is encapsulated with a laser emitting part and a laser receiving part, the laser emitting part corresponds to the transmitting channel, the laser receiving part corresponds to the receiving channel, and the lens is assembled in the transmitting channel.

[0009] Furthermore, the lens can adjust the illumination field of the laser emitted by the laser ranging chip in a range of 1 to 35 degrees.

[0010] Furthermore, the cross-sectional shape of the emission channel is narrow at the top and wide at the bottom.

[0011] Furthermore, the cross-sectional shape of the receiving channel is narrow at the top and wide at the bottom.

[0012] Furthermore, the cover plate is sealed and fixed in the second mounting groove by glue.

[0013] Furthermore, an overflow glue groove for accommodating overflow glue is provided on the upper groove wall of the second mounting groove.

[0014] The utility model also provides a height measuring instrument, comprising a measuring support platform and the above-mentioned laser distance measuring module, wherein the measuring support platform has a mounting plate and a base which are arranged in an upper and lower manner and are parallel to each other, the laser distance measuring module is assembled on the mounting plate, and the base is used for the person being measured to stand.

[0015] Furthermore, the laser ranging modules are arranged in a plurality, and the plurality of laser ranging modules are fixedly assembled on the mounting plate at intervals.

[0016] Furthermore, the number of the laser ranging modules is at least one, a slidable slider is mounted on the mounting plate, and at least one laser ranging module is fixedly mounted on the slider.

[0017] Furthermore, the moving track of the slider is in an 8-shape or a Z-shape.

[0018] The technical solution provided by the utility model has the following beneficial effects:

[0019] The laser ranging chip is packaged with a laser emitting part and a laser receiving part, so that laser emitting and laser receiving are integrated on the same laser ranging chip at the same time. Then, a ranging circuit board with a laser ranging chip is assembled in the first mounting groove of the shell, the lens is assembled in the emitting channel, and the cover plate is embedded in the second mounting groove of the shell to form a sealing fit, so as to form a laser ranging module with a simple structure. The irradiation field and the field of view angle of the laser ranging chip are both within the preset specification range, and it is ensured that the laser ranging module does not need to be calibrated again or reassembled before use, so that the height of the person being measured can be measured quickly and accurately, and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a cross-sectional view of the laser ranging module in Example 1;

[0021] Figure 2 Shown is an exploded view of the laser ranging module in Example 1;

[0022] Figure 3 The figure shows the appearance of the housing in the first embodiment;

[0023] Figure 4 Shown is a schematic diagram of a height measuring instrument in Embodiment 2;

[0024] Figure 5 The figure shows the appearance of the height measuring instrument in the second embodiment;

[0025] Figure 6 Shown is a schematic diagram of a height measuring instrument in Embodiment 3;

[0026] Figure 7 Shown is a schematic diagram of a height measuring instrument in the fourth embodiment;

[0027] Figure 8 Shown is a schematic diagram of another height measuring instrument in the fourth embodiment. DETAILED DESCRIPTION

[0028] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0030] Embodiment 1

[0031] Reference Figures 1 to 3 As shown, the first embodiment provides a laser ranging module for height measurement, the laser ranging module includes a housing 1 for shielding laser, a light-transmitting cover plate 4, a ranging circuit board 2 with a laser ranging chip 21, and a lens 3 for adjusting the irradiation field of the laser ranging chip 21. The housing 1 has a first mounting groove 11 and a second mounting groove 12 which are arranged in an upper and lower manner and spaced from each other, and a transmitting channel 13 and a receiving channel 14 located between the first mounting groove 11 and the second mounting groove 12. One end of the transmitting channel 13 and the receiving channel 14 are both connected to the first mounting groove 11, and the other end is connected to the first mounting groove 11. The second mounting groove 12 and the first mounting groove 11 are located in the shell 1. The outer wall of the shell 1 is provided with a mounting groove which passes through to the second mounting groove 12. The ranging circuit board 2 is assembled in the first mounting groove 11. The cover plate 4 passes through the mounting groove and is then embedded in the second mounting groove 12 to form a sealed fit. The cover plate 4 abuts against the channel openings of the transmitting channel 13 and the receiving channel 14. The laser ranging chip 21 is encapsulated with a laser emitting part 211 and a laser receiving part 212. The laser emitting part 211 corresponds to the transmitting channel 13, and the laser receiving part 212 corresponds to the receiving channel 14. The transmitting channel 13 is equipped with a lens 3.

[0032] In this embodiment, the cross-sectional shapes of the transmitting channel 13 and the receiving channel 14 are narrow at the top and wide at the bottom. The narrow parts of the transmitting channel 13 and the receiving channel 14 are respectively close to the laser transmitting part 211 and the laser receiving part 212, and the wide parts of the transmitting channel 13 and the receiving channel 14 are close to the cover plate 4. This ensures that the adjustment range of the irradiation field and the field of view angle of the laser ranging chip 21 is large enough, and the lasers in the transmitting channel 13 and the receiving channel 14 do not interfere with each other and are both shielded by the shell 1.

[0033] The lens 3 is fixed to the wide part of the emission channel 13 by glue, and the lens 3 is located between the laser emitting part 211 and the cover plate 4. By selecting different types of lenses 3, the irradiation field of the laser emitted by the laser ranging chip 21 (i.e., the FOI of the laser ranging chip 21) can be adjusted. That is, the adjustment range of the irradiation field of the laser emitted by the laser ranging chip 21 by the lens 3 is 1 to 35 degrees, and then the field of view angle of the laser receiving part 212 (i.e., the FOV of the laser ranging chip 21) is adjusted to control the ranging accuracy and range of the laser ranging module to match the height and standing posture of the person being measured.

[0034] The larger the irradiation field of the laser ranging chip 21 of this embodiment is, the larger the viewing angle of the laser ranging chip 21 is.

[0035] On the contrary, the smaller the irradiation field of the laser ranging chip 21 of this embodiment is, the smaller the viewing angle of the laser ranging chip 21 is.

[0036] Under the same conditions, if the laser ranging chip 21 has a larger FOV, the corresponding measuring range is shorter and the ranging accuracy is also lower, but the standing posture requirement of the measured person is lower and the standing position (i.e., standing position) range of the measured person is larger, which is conducive to the convenience of height measurement operation.

[0037] If the laser ranging chip 21 has a smaller FOV, the corresponding range is larger and the ranging accuracy is also higher, but the standing posture requirements of the person being measured are higher, and the person being measured needs to stand at the center corresponding to the laser irradiation, which is not conducive to the convenience of height measurement.

[0038] The laser emitting unit 211 emits a laser (such as an infrared laser), which first passes through the emitting channel 13 and then passes through the lens 3. After the laser is collimated by the lens 3, it passes through or through the cover plate 4 (such as the cover plate 4 is made of a material that can transmit infrared lasers) and hits the surface of the person being measured. The laser is then reflected and passes through the cover plate 4 and the receiving channel 14 in sequence until it is received by the laser receiving unit 212 and calculated based on the time-of-flight method (i.e., TOF) to determine the height of the person being measured.

[0039] The laser ranging chip 21 is encapsulated with a laser emitting part 211 and a laser receiving part 212, so as to realize the integration of laser emitting and laser receiving on the same laser ranging chip 21 at the same time. Then, the ranging circuit board 2 with the laser ranging chip 21 is assembled in the first mounting groove 11 of the housing 1, the lens 3 is assembled in the emitting channel 13, and the cover plate 4 is embedded in the second mounting groove 12 of the housing 1 to form a sealing fit, so as to form a laser ranging module with a simple structure. The cost of the laser ranging module is also low, and the irradiation field and the field of view angle of the laser ranging chip 21 are within the preset specification range, and it is ensured that the laser ranging module does not need to be calibrated again or reassembled before use, so as to realize the rapid and accurate measurement of the height of the person being measured, which is convenient to operate.

[0040] In another preferred embodiment, the cover plate 4 is fixed in the second installation groove 12 by glue sealing, and the upper groove wall of the second installation groove 12 is provided with a glue overflow groove 15 for accommodating overflow glue.

[0041] In this specific embodiment, the ranging circuit board 2 is provided with a communication interface 22 for connecting to an external device, the input end of the communication interface 22 is connected to the output end of the laser ranging chip 21, and the ranging circuit board 2 can be powered by the power supply end of the communication interface 22.

[0042] After the height test of the person being measured is completed, the laser ranging chip 21 processes the data signal related to the height of the person being measured, and then transmits the data signal to the external device through the communication interface 22 to realize the direct display of the height value.

[0043] In addition, the cover plate 4 is glued and fixed in the second mounting groove 12 by glue. The cover plate 4 covers the channel openings of the transmitting channel 13 and the receiving channel 14, which can prevent foreign matter such as dust from the outside from entering the transmitting channel 13 and the receiving channel 14, thereby avoiding the laser in the transmitting channel 13 and the receiving channel 14 from being affected.

[0044] During the glue bonding process between the cover plate 4 and the housing 1 , excess glue flows into the glue overflow groove 15 to prevent the glue from overflowing the front side of the cover plate 4 (ie, the surface facing the air), thereby avoiding affecting the overall appearance.

[0045] Of course, in other embodiments, the cover plate 4 and the housing 1 may also be fixed together by adhesive tape bonding, screwing, or nesting.

[0046] Embodiment 2

[0047] Reference Figure 4 and Figure 5 As shown, embodiment 2 provides a height measuring instrument, including a measuring support platform 6 and the laser ranging module 5 of embodiment 1, the measuring support platform 6 has a mounting plate 61 and a base 63 which are arranged upper and lower and parallel to each other, the laser ranging module 5 is fixedly mounted on the mounting plate 61, and the base 63 is used for the person being measured to stand.

[0048] In this specific embodiment, an indicator mark 631 for indicating the standing position of the person being measured is provided on the base 63, and the mounting plate 61 and the base 63 are connected and fixed by a vertical support rod 62, and the mounting plate 61 and the base 63 are respectively perpendicular to the vertical support rod 62 to ensure that the mounting plate 61 and the base 63 are parallel to each other to ensure the accuracy of the height measurement of the person being measured.

[0049] The number of laser ranging modules 5 is one, and the irradiation field (i.e., FOI) of the laser ranging chip of the laser ranging module 5 is set to 6 to 8 degrees to ensure that the field of view (i.e., FOV) of the laser ranging chip is within a larger range, thereby ensuring that the measurement range of the laser ranging module 5 is also larger, which is beneficial to reducing the requirements for the standing posture and position of the person being measured.

[0050] The laser emitting part of the laser ranging module 5 emits a laser, which first passes through the emitting channel and then passes through the lens shown. After the laser is collimated by the lens shown, it passes through or penetrates the cover plate and hits the surface of the person being measured. Then the laser is reflected and passes through the cover plate and the receiving channel in sequence until it is received by the laser receiving part. The height of the person being measured is calculated based on the time-of-flight method. Then, the height data is transmitted from the laser ranging chip to an external device (such as a computer) through the communication interface, and the height value of the person being measured is displayed on the external device.

[0051] The laser ranging module 5 and the measuring support platform 6 constitute a height measuring instrument with a simple structure. The cost of the height measuring instrument is also low. The irradiation field and the field of view angle of the laser ranging chip of the laser ranging module 5 are both within the preset specification range, and it is ensured that the height measuring instrument does not need to be calibrated again or reassembled before use, so that the height of the person being measured can be measured quickly and accurately, which is convenient to operate.

[0052] Embodiment 3

[0053] Reference Figure 6 As shown, embodiment 3 provides a height measuring instrument. The structure of embodiment 3 is substantially the same as that of embodiment 2, except that: the number of laser ranging modules 5 is 5, the 5 laser ranging modules 5 are fixedly assembled on the mounting plate 61 at intervals, and the 5 laser ranging modules 5 are arranged in a cross shape.

[0054] The illumination field (i.e., FOI) of the laser ranging chip of the laser ranging module 5 is set to 1 to 2 degrees to ensure that the field of view (i.e., FOV) of the laser ranging chip is within a smaller range and to avoid mutual interference among the laser ranging modules 5.

[0055] When the person being measured stands within the range of the indication mark, the five laser ranging modules 5 respectively measure the height of the person being measured once to form height data corresponding to five different body positions, and transmit the five height data to the external device for processing through the communication interface. The external device processes all the collected height data according to a certain logic program (such as the maximum value of all the height data is the height measured by the height measuring instrument), and displays the height value of the person being measured on the external device. The height value displayed on the external device is the height measured by the height measuring instrument, which can avoid the problem of inaccurate height measurement due to the person being measured standing crookedly.

[0056] Of course, in other embodiments, the number of laser ranging modules 5 can also be 2, 3, 4 or more than 6, and multiple laser ranging modules 5 are fixedly assembled on the mounting plate 61 at intervals, which can also achieve accurate measurement of the height of the person being measured.

[0057] Embodiment 4

[0058] Reference Figure 7 As shown, embodiment 4 provides a height measuring instrument. The structure of embodiment 4 is substantially the same as that of embodiment 2, except that a slidable slider is mounted on the mounting plate 61, a single laser ranging module 5 is fixedly mounted on the slider, and the movable track of the slider is in an 8-shape.

[0059] During specific implementation, a driving assembly for driving the slider to move is installed on the mounting plate 61, and the mounting plate 61 is provided with an 8-shaped slideway. The slider can be slidably installed on the slideway, and the driving assembly drives the slider to move along the slideway to form a dynamic scan of an 8-shaped active trajectory.

[0060] The irradiation field (i.e., FOI) of the laser ranging chip of the laser ranging module 5 is set to 1 to 2 degrees. After the height measuring instrument completes the dynamic scanning, the single laser ranging module 5 measures the height of the person being measured multiple times to form multiple height data, and transmits all the height data to the external device for processing through the communication interface. The external device processes all the collected height data according to a certain logic program (such as the maximum value of all the height data is the height measured by the height measuring instrument), and displays the height value of the person being measured on the external device. The height value displayed on the external device is the height measured by the height measuring instrument. This can also avoid the problem of inaccurate height measurement due to the person being measured standing crookedly.

[0061] Of course, in other embodiments, the number of laser ranging modules 5 may be more than two, and a plurality of laser ranging modules 5 may be fixedly mounted on the slider, so that the height of the person being measured can be accurately measured.

[0062] In addition, the moving track of the slider can also be in the shape of a field, a sun or the like. Figure 8 The Z-shape etc. shown will not be described in detail here.

[0063] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A laser ranging module, comprising a housing for shielding laser, characterized in that: It also includes a light-transmitting cover plate, a distance measuring circuit board having a laser distance measuring chip, and a lens for adjusting the irradiation field of the laser emitted by the laser distance measuring chip; The housing has a first mounting slot and a second mounting slot which are arranged in an upper and lower manner and spaced from each other, and a transmitting channel and a receiving channel located between the first mounting slot and the second mounting slot, one end of the transmitting channel and the receiving channel are both connected to the first mounting slot, and the other end of the transmitting channel and the receiving channel are both connected to the second mounting slot; The first installation slot is located in the shell, and the outer wall of the shell is provided with an installation slot extending through to the second installation slot; The ranging circuit board is assembled in the first mounting groove, the cover plate passes through the mounting groove, and then is embedded in the second mounting groove to form a sealing fit, and the cover plate abuts against the channel openings of the transmitting channel and the receiving channel; The laser ranging chip is packaged with a laser emitting part and a laser receiving part, the laser emitting part corresponds to the emitting channel, the laser receiving part corresponds to the receiving channel, and the lens is installed in the emitting channel.

2. The laser ranging module according to claim 1, characterized in that: The lens can adjust the illumination field of the laser emitted by the laser ranging chip in a range of 1 to 35 degrees.

3. The laser ranging module according to claim 1, characterized in that: The cross-section of the emission channel is narrow at the top and wide at the bottom.

4. The laser ranging module according to claim 1, characterized in that: The cross-sectional shape of the receiving channel is narrow at the top and wide at the bottom.

5. The laser ranging module according to any one of claims 1 to 4, characterized in that: The cover plate is sealed and fixed in the second mounting groove by glue.

6. The laser ranging module according to claim 5, characterized in that: The upper groove wall of the second installation groove is provided with a glue overflow groove for accommodating the overflowed glue.

7. A height measuring instrument, characterized in that: It comprises a measuring support platform and the laser ranging module as described in any one of claims 1-6, wherein the measuring support platform has a mounting plate and a base which are arranged in an upper and lower manner and are parallel to each other, the laser ranging module is mounted on the mounting plate, and the base is used for a person to be measured to stand.

8. The height measuring instrument according to claim 7, characterized in that: There are multiple laser distance measuring modules, and the multiple laser distance measuring modules are fixedly assembled on the mounting plate at intervals.

9. The height measuring instrument according to claim 7, characterized in that: The number of the laser distance measuring modules is at least one, a slidable slider is mounted on the mounting plate, and at least one laser distance measuring module is fixedly mounted on the slider.

10. The height measuring instrument according to claim 9, characterized in that: The moving track of the slider is in an 8-shape or a Z-shape.

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