Distance measuring device

Abstract

To provide a distance measuring device that has a simple configuration and can easily collect distance measurement results. [Solution] The distance measuring device 1 includes a passage section 13 through which a tape 2 connected to a moving object 3 passes, an optical distance sensor 11 that irradiates light onto the tape 2 as it passes through the passage section 13 to measure the distance the tape 2 travels, and a transmission section 12 that collects the distance traveled by the optical distance sensor 11 and transmits it to a display device.

Description

Technical Field

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[0003]

[0001] The present invention relates to a moving distance measuring device.

Background Art

[0002] In physics classes in school education and the like, an experiment is conducted to measure the moving distance of a mechanical trolley to measure its speed. In such an experiment, a recording timer is used as a moving distance measuring device for the mechanical trolley. The recording period of the recording timer is constant (1 / 50 seconds or 1 / 60 seconds). If a recording tape is attached to the moving mechanical trolley, the distance between the points recorded on the recording tape can be measured, and by dividing the distance between the points by the time interval, the speed of the mechanical trolley at any time can be calculated.

[0003] Since it takes time to collect the measurement results in the experiment of the mechanical trolley, it is desirable to automate the aggregation when conducting experiments in various patterns, such as when changing the inclination angle of the running surface. Patent Document 1 discloses a system that substitutes a recording timer by automatically measuring and measuring the position of a mechanical trolley without using a recording tape by utilizing electronic components such as sensors.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0006] This invention has been made in view of these problems, and aims to provide a distance measuring device that can easily collect measurement results of the distance traveled by a moving object with a simple configuration, while using tape similar to a recording timer. [Means for solving the problem]

[0007] The present invention provides a distance measuring device comprising: a passage section through which a tape connected to a moving object passes; an optical distance sensor that measures the distance traveled by irradiating light onto the tape passing through the passage section; and a transmission unit that collects the distance traveled by the tape obtained by the optical distance sensor and transmits it to a display device. [Effects of the Invention]

[0008] According to the present invention, the distance measuring device irradiates light onto a tape passing through a passage section and measures the distance the tape travels using an optical travel sensor. The transmission unit then transmits the collected distance to an external display device. By transmitting the data to a display device in this manner, the collection of measurement results for the distance traveled by a moving object can be easily achieved.

[0009] Furthermore, the distance-measuring device of the present invention measures the distance traveled by the tape in the same way as the recording timer used in experiments using a dynamics cart in school education. Therefore, learners can easily understand that the measurement results obtained by the distance-measuring device observe the same physical phenomenon as the measurement results obtained by the recording timer. Moreover, the optical movement sensor is a general-purpose device used in mice and the like, making it easy to procure and inexpensive, thus lowering the barrier to introduction in learning environments. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of the travel distance measuring device of this embodiment. [Figure 2] Figure 1 is an exploded perspective view of the distance measuring device shown. [Figure 3] This figure shows the software configuration of the distance measurement device shown in Figure 1. [Figure 4] Figure 3 shows an example of a display on the display device shown. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, the same reference numerals are used for identical components, and redundant descriptions are omitted.

[0012] Figure 1 is a schematic diagram of the travel distance measuring device 1 of this embodiment. For the purposes of this explanation, the longitudinal direction (lower left / upper right direction in the figure) of the travel distance measuring device 1 will be referred to as the x-axis, the short direction (lower right / upper left direction in the figure) as the y-axis, and the height direction (down / up direction in the figure) as the z-axis. Also, for readability, the directions of up, down, left, and right in the figure may be used in the explanation, but the travel distance measuring device 1 can be placed in any direction, not limited to the directions shown in the figure.

[0013] The distance measuring device 1 comprises a roughly rectangular sensor unit 11 located above the sensor unit 11, and a roughly rectangular control unit 12 located below the sensor unit 11 with a larger base than the sensor unit 11. The tape 2 is connected to the dynamics trolley 3, and the tape 2 moves longitudinally (in the y-axis direction) in accordance with the movement of the dynamics trolley 3 in the y-axis direction. The control unit 12 is provided with a passage section 13 through which the tape 2 can slide in the y-axis direction. The passage section 13 is a space whose upper part is covered by the sensor unit 11, but it has a separation section extending in the y-axis direction on the lower left side of the figure. The tape 2 is inserted into the passage section 13 through this separation section. The dynamics trolley 3 is an example of a moving object.

[0014] The distance measuring device 1 measures the distance traveled by the tape 2 as it passes through the passage section 13 and transmits the measurement results to an external device. The user can use these measurement results to observe the changes in the distance traveled and the speed of the dynamics trolley 3 over time. The distance measuring device 1 can be used for various purposes, not limited to the distance traveled by the dynamics trolley 3.

[0015] The sensor unit 11 has an optical distance sensor and acquires the distance traveled by the tape 2 in the y-axis direction. The sensor unit 11 is provided with a switch 14 and an LED 15 on its top surface. The start / stop of distance measurement by the sensor unit 11 is controlled according to the operation of the switch 14. The LED 15 is lit while the sensor unit 11 is measuring the distance traveled by the tape 2. Note that the start / stop of distance measurement by the sensor unit 11 may be operated by an external device instead of the switch 14.

[0016] The control unit 12 is connected to an external device (not shown in Figure 1), such as a computer, via cable 4. For example, the connection is made via USB (Universal Serial Bus). The control unit 12 receives power from the external device via cable 4 and transmits the measurement results acquired by the sensor unit 11 to the external device. Note that two or more wires for power supply and signal transmission may be provided between the distance measuring device 1 and the external device.

[0017] Figure 2 is an exploded perspective view of the distance measuring device 1. Figure 2 shows the sensor unit 11 and the control unit 12 in a disassembled state, and the distance measuring device 1 is constructed by assembling the sensor unit 11 and the control unit 12. Hereafter, the assembly of the sensor unit 11 and the control unit 12 will be simply referred to as "assembly". The sensor unit 11 and the control unit 12 are connected by a connecting wire 16, and the control of the sensor unit 11 and the transmission and reception of measurement results are performed via the connecting wire 16.

[0018] On the surface of the sensor unit 11 facing the control unit 12, a sensor area 112 on which the sensing part 111 is provided and a sensor-side connection area 114 on which the sensor-side connection part 113 of the connection wiring 16 is located are arranged side by side in the x-axis direction. The height of the surface of the sensor area 112 in the z-axis direction toward the control unit 12 during assembly is configured such that, in the direction of movement of the tape 2 (y-axis direction), the central part is higher than the vicinity of the entrance 131 and exit 132 of the tape 2. The sensor-side connection area 114 has an edge portion 115 on its outer circumference that protrudes toward the control unit 12.

[0019] The sensing unit 111 is an optical movement sensor that illuminates a portion of the tape 2 as it passes through the passage section 13 at predetermined intervals and acquires the reflected light. A distance measuring unit (not shown in Figure 2) is provided inside the sensor unit 11. The distance measuring unit detects the unevenness of the tape 2 using the difference in intensity within a predetermined area of ​​the reflected light acquired by the sensing unit 111, and acquires the distance traveled by the tape 2 in the y-axis direction by comparing the detection results of the unevenness over time. The sensor unit 11 only needs to be able to measure the distance in the direction of movement (y-axis) of the tape 2, and may also be able to measure the distance traveled in two axes in the xy plane. As an example, the sensor unit 11 can measure with a polling rate (number of scans per second) of 25 to 100,000 Hz and a resolution of 200 to 30,000 DPI (Dots Per Inch, the number of measurable points in 1 inch (2.54 cm)). Furthermore, by setting the polling rate to the same as that of the recording timer (50Hz / 60Hz), it becomes easier to compare the measurement results with those of the recording timer.

[0020] On the surface of the control unit 12 facing the sensor unit 11, there are provided a passage area 121 through which the tape 2 passes, a control unit side connection area 123 where the control unit side connection part 122 of the connection wiring 16 is provided, and an exposed area 124 that is exposed without being covered by the sensor unit 11 during assembly, which are arranged side by side in the x-axis direction. During assembly, the sensor side connection area 114 of the sensor unit 11 and the control unit side connection area 123 of the control unit 12 are connected, and the sensor area 112 of the sensor unit 11 and the passage area 121 of the control unit 12 face each other.

[0021] In the passage area 121, except for the part adjacent to the control unit side connection area 123, an edge part 125 protruding toward the sensor unit 11 side is provided. The edge part 125 is composed of a part extending in the y-axis direction and two parts extending in the x-axis direction that are connected with rounded corners.

[0022] In the control unit side connection area 123, a recess 126 that is rectangular in the xy plane and has a depth in the z-axis direction is provided. The recess 126 is defined by the exposed area 124 in the x-axis direction and by side walls 127 extending in the x-axis direction in the y-axis direction. The edge part 115 of the sensor area 112 of the sensor unit 11 fits into the recess 126. By this fitting, the sensor unit 11 is connected to the control unit 12 during assembly.

[0023] Here, the surface of the sensor area 112 of the sensor unit 11 and the bottom surface within the edge part 125 of the passage area 121 of the control unit 12 that face each other during assembly are referred to as the sensor surface and the sensor facing surface, respectively. Further, the side surface on the sensor area 112 side of the edge part 115 of the sensor side connection area 114 of the sensor unit 11, which is connected to the sensor surface and the center facing surface during assembly and can support the tape 2 in the width direction, is referred to as the width direction support surface 116. The passage part 13 of the tape 2 is defined by these sensor surface (sensor area 112), sensor facing surface (passage area 121), and width direction support surface 116.

[0024] When the passage region 121 is assembled, the height in the z-axis direction toward the sensor unit 11 (amount of upward protrusion) is configured such that, in the direction of movement of the tape 2 (y-axis direction), the central part is higher than the vicinity of the entrance 131 and exit 132 of the tape 2.

[0025] As described above, the height of the surface of the sensor area 112 in the z-axis direction toward the control unit 12 during assembly is configured such that, in the direction of movement of the tape 2 (y-axis direction), the central part is higher than the vicinity of the entrance 131 and exit 132 of the tape 2. Therefore, during assembly, the distance between the sensor area 112 of the sensor unit 11 and the passage area 121 of the control unit 12, i.e., the height of the passage area 13 in the z-axis direction, is narrower in the y-axis direction than the vicinity of the entrance 131 and exit 132 of the tape 2. As a result, the tape 2 is positioned in the height direction (z-axis direction) at the position where it is read by the sensing unit 111 located in the central part, thus suppressing a decrease in reading accuracy.

[0026] The passage region 121 of the control unit 12 has an opening 128 extending in the width direction (x direction) at the center of the tape 2's movement direction (y direction). In the illustrated example, there are two openings 128 along the tape 2's movement direction (y direction). A claw portion 129 is provided inside the opening 128. The end of the claw portion 129 on the side of the control unit side connection region 123 is fixed, while the opposite end is left unfixed and is a free end.

[0027] The claw portion 129 has a passage area 121 and a surface at a face position, and on the free end side surface, it has a guide member 130 that can position the tape 2 in the width direction (x-axis direction). The guide member 130 has a side surface (guide surface) on the control unit side connection area 123 side, and this side surface is used to position the tape 2 in the width direction. Therefore, during assembly, the spacing between the side surface of the guide member 130 and the width direction support surface 116 of the sensor unit 11 is designed to be equal to the width of the tape 2.

[0028] Here, the passage portion 13 is the space between the sensor surface (sensor area 112) and the sensor-facing surface (passage portion 121). In the width direction (x-axis direction) of the tape 2, one side of the passage portion 13 is closed by the width direction support surface 116 of the sensor unit 11, but the opposite side is separated and open. This separated portion is provided along the entire length of the movement direction (y-axis direction) of the tape 2. When attaching the tape 2 to the travel distance measuring device 1, the tape 2 is slid in the width direction from the separated portion and inserted into the passage portion 13.

[0029] The upper surface of the guide member 130 is configured to become lower (thicker in the z-axis direction) from the side (guide surface) on the fixed end side toward the free end side of the claw portion 129. With this configuration, when sliding the tape 2 from the separation portion into the passage portion 13, the surface on the free end side of the guide member 130 is configured to be lower, so the tape 2 can be inserted into the passage portion 13 without being obstructed by the guide member 130.

[0030] Furthermore, the side surface (guide surface) of the fixed end of the guide member 130 comes into contact with the sensor area 112 (sensor surface) of the sensor unit 11 during assembly. This contact between the side surface (guide surface) and the sensor area 112 (sensor surface) fixes the tape 2 in the width direction within the passage section 13, preventing it from slipping out of the passage section 13.

[0031] Furthermore, since the claw portion 129 on which the guide member 130 is provided has a free end on the side where the guide member 130 is provided, the guide member 130 is not fixed and can move in the vertical direction. When sliding the tape 2 from the separation portion into the passage portion 13, even if the side surface (guide surface) on the fixed end side of the guide member 130 is in close contact with the sensor surface (sensor area 112), the tape 2 can be inserted into the passage portion 13 beyond the guide member 130.

[0032] An inlet 131 and an outlet 132 for the tape 2 are provided in the passage region 121 and the control unit side connection region 123. In detail, the inlet 131 and the outlet 132 are defined by the edge 125 of the passage region 121 and the side surface of the side wall 127 of the control unit side connection region 123 at positions opposite each other in the y-axis direction. The opposing sides of these edge 125 and side wall 127 are tapered so as to narrow from the outside to the inside of the travel distance measuring device 1. Even if the tape 2 is displaced in the width direction (x-axis direction) when the dynamics trolley 3 moves, the tapered shape of the inlet 131 prevents the tape 2 from being damaged by the corner of the edge 125. Note that both the inlet 131 and the outlet 132 do not need to be tapered; at least one of them may be tapered.

[0033] Figure 3 is an explanatory diagram of the operation of the software of the distance measuring device 1. The distance measuring device 1 is connected to a computer 5 via a cable 4. The computer 5 is configured to communicate with a server 7 via a network 6. The computer 5 downloads and runs the software from the server 7, and displays the measurement results from the distance measuring device 1 on the screen. Because the software is run on a cloud-based platform such as a Progressive Web Application (PWA), it is not necessary to install the control software for the distance measuring device 1 on the computer 5.

[0034] The distance measuring device 1 is designed so that it is not recognized by the computer 5 as a device that accepts user input, such as a mouse or keyboard. For example, in the Human Interface Device (HID) specification, the distance measuring device 1 is configured as a different type of device from user input devices such as a mouse (0x02) or keyboard (0x06) in a generic desktop. Generally, optical distance sensors are used in optical mice, so in a generic setting, the computer 5 would recognize the distance measuring device 1 as a mouse. In such a case, the mouse pointer on the screen would move according to the distance traveled, and there is a risk that the mouse pointer would move to an unintended location each time a measurement is taken. Therefore, by making the distance measuring device 1 recognized as a different type of device from user input devices, it is possible to prevent the measurement results from being treated as operations of the computer 5.

[0035] The sensor unit 11 comprises a sensor control unit 31 and a distance measuring unit 32. The sensor control unit 31 controls the irradiation of light at predetermined intervals and the measurement of reflected light by the sensing unit 111, and the distance measuring unit 32 calculates the distance traveled at predetermined intervals based on the measurement results of the reflected light collected by the sensing unit 111.

[0036] The control unit 12 comprises an overall control unit 33 and a measurement result collection unit 34. The overall control unit 33 controls the entire distance measuring device 1, including the sensor unit 11. The measurement result collection unit 34 converts the data acquired by the distance measuring unit 32 into a predetermined format and transmits it to the computer 5.

[0037] The overall control unit 33 controls the start / stop of measurement by the travel distance measuring device 1 in response to operations by the switch 14 and / or the computer 5. The overall control unit 33 also controls the illumination of the LED 15 of the sensor unit 11 while the travel distance is being measured.

[0038] A power control unit 35 is provided within the distance measuring device 1. When the distance measuring device 1 operates using power supplied from the computer 5, the power control unit 35 converts the supplied power into drive power for the sensor unit 11 and the control unit 12. If the drive power for the sensor unit 11 and the control unit 12 are different, the power control unit 35 converts and supplies them to predetermined drive power for each.

[0039] Figure 4 shows the screen on the computer 5 during operation of the distance measuring device 1. As shown in the figure, the drawing area 41 in the center of the screen displays the coordinates in a time series using the x-axis (42X) and y-axis (42Y). Also, on the right side of the figure, there is a total time result display area 43 that can display the measurement results for all time points. The display scale of the x-axis (42X) and y-axis (42Y) is variable.

[0040] The drawing area 41 and the all-time results display area 43 display at least one piece of information, such as distance, velocity, or acceleration, according to the selection made by the selection unit 44. Within the drawing area 41, the distance traveled at each measurement time is shown as black circles, and an approximation line passing through these black circles is shown. Distance and velocity may be approximated by quadratic or linear functions. Since it is desirable for acceleration to be a constant value, it may be approximated by a linear function, similar to velocity. The all-time results display area 43 displays information for all time points of any of the distance, velocity, or acceleration displayed in the drawing area 41. In the illustrated example, distance is indicated by the selection unit 44. The legend display unit 45 contains the display marks for distance, velocity, and acceleration in the drawing area 41.

[0041] The user can view details of the measurement results for any time within the drawing area 41 by selecting the measurement result for that time. In the figure, one of the measurement results within the drawing area 41 is selected, and the selected measurement result 46 is indicated by a larger black circle than the measurement results for other times. When the user selects the selected measurement result 46, which is one of the measurement results within the drawing area 41, the measurement result display area 47 displays detailed information (distance / velocity / acceleration) for each time shown in the drawing area 41. Note that the contents of the illustrated measurement result display area 47 represent only a portion of the measurement results.

[0042] According to this embodiment of the travel distance measuring device 1, the following effects can be obtained.

[0043] The travel distance measuring device 1 of this embodiment includes a passage section 13 through which a tape 2 connected to a moving object, a dynamics cart 3, passes; an optical travel distance sensor (sensor unit 11) that irradiates light onto the tape 2 as it passes through the passage section 13 to measure the travel distance of the tape 2 in the longitudinal direction; and a transmission unit (control unit 12) that collects the travel distance acquired by the optical travel distance sensor (sensor unit 11) and transmits it to a display device (computer 5).

[0044] The sensor unit 11 irradiates light onto the tape 2 as it passes through the passage section 13 to measure the longitudinal distance traveled by the tape 2. The control unit 12 collects the distance traveled measured by the sensor unit 11 and transmits the collected distance traveled to the computer 5. By using the sensor unit 11 to measure the longitudinal distance traveled by the tape 2 in this way, it is possible to easily collect the measurement results of the movement distance of the dynamics trolley 3.

[0045] Furthermore, in experiments using a recording timer, the longitudinal distance traveled by tape 2 is measured, so learners can easily understand that the recording timer and the distance measuring device 1 of this application are measuring the longitudinal distance traveled by the same tape 2. Moreover, the sensor unit 11, which is an optical movement sensor, is a general-purpose device used in mice and the like, making it easy to procure and inexpensive. Also, for example, when a moving object is in free fall, it is necessary to acquire measurement results with high resolution, but even high-resolution optical movement sensors are relatively inexpensive. Therefore, the introduction cost in learning environments can be reduced, promoting widespread adoption.

[0046] The passage section 13 of the travel distance measuring device 1 in this embodiment is a space defined by a sensor surface on which a sensing unit 111 is provided, a sensor-facing surface opposite to the sensor surface, and a width-direction support surface 116 that connects to the sensor surface and the sensor-facing surface and supports the tape 2 in the width direction, with a gap on the opposite side of the width-direction support surface 116. By providing such a gap, the tape 2 can be slid in the width direction from this gap and inserted into the passage section 13, making it easy to attach the tape 2 to the travel distance measuring device 1.

[0047] The distance measuring device 1 of this embodiment further includes a guide member 130 on the sensor-facing surface, which has a guide surface that guides the tape 2 on the side of the separated portion. With this guide member 130, even if the passage portion 13 has a separated portion on the side opposite the width-direction support surface 116, the tape 2 is stably guided in the width direction by the guide member 130. As a result, the tape 2 can pass through the passage portion 13 stably without shifting in the width direction.

[0048] The guide member 130 of the travel distance measuring device 1 in this embodiment is configured to be lower in the thickness direction of the tape 2 from the guide surface side toward the separation portion side. With this configuration, when sliding the tape 2 from the separation portion into the passage portion 13, insertion is possible without being obstructed by the guide member 130.

[0049] In the travel distance measuring device 1 of this embodiment, the guide surface of the guide member 130 is in contact with the sensor surface. The guide surface on the fixed end side of the guide member 130 positions the tape 2 in the width direction within the passage section 13. As a result, the contact between the guide surface and the sensor area 112 (sensor surface) fixes the tape 2 in the width direction within the passage section 13, suppressing it from slipping out of the passage section 13.

[0050] The sensor-facing surface of the distance measuring device 1 in this embodiment is provided with an opening 128 that extends in the width direction of the tape 2. A claw portion 129 is positioned in this opening 128, with one end fixed on the width direction support surface 116 side and the other end being a free end. The claw portion 129 has a surface flush with the sensor-facing surface, and a guide member 130 is provided on the surface of the free end side (separation side).

[0051] Since the guide member 130 is provided on the free end side of the claw portion 129, the guide member 130 is not fixed and can move in the vertical direction. As a result, when sliding the tape 2 from the separation portion into the passage portion 13, the tape 2 can be smoothly inserted into the passage portion 13 even when the guide surface of the guide member 130 is in close contact with the sensor surface.

[0052] The passage section 13 of the travel distance measuring device 1 in this embodiment includes an inlet 131 and an outlet 132 for the tape 2. At least one of the inlet 131 and the outlet 132 is configured to be wider from the inside to the outside in the width direction. Furthermore, even if the tape 2 is displaced in the width direction (x-axis direction) when the dynamics trolley 3 moves, damage to the tape 2 can be suppressed because the opposing sides of the edge 125 and side wall 127 constituting the inlet 131 and the outlet 132 are designed to be wider outwards.

[0053] In this embodiment, the distance between the sensor area 112 (sensor surface) of the sensor unit 11 of the travel distance measuring device 1 and the passage area 121 (sensor-facing surface) of the control unit 12 is such that, in the direction of movement of the tape 2 (y-axis direction), the distance at the position of the sensing unit 111 is shorter than the distance at the entrance 131 and exit 132. With this configuration, the tape 2 to be read is positioned in the height direction (z-axis direction) at the sensing unit 111, thereby improving reading accuracy.

[0054] In this embodiment, the sensing unit 111 of the sensor unit 11 is recognized by the display device (computer 5) as a device of a different type from the user operation device. Optical movement sensors are also used in optical mice, but if an optical movement sensor is used as the sensor unit 11, the computer 5 may mistakenly recognize the movement distance measuring device 1 as a mouse, and the mouse pointer on the screen may move according to the measurement result. In this embodiment, by recognizing the sensing unit 111 as a device different from the user operation device, unintended movement of the mouse pointer can be prevented.

[0055] This invention allows for various embodiments and modifications without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. In other words, the scope of the invention is indicated not by the embodiments, but by the claims. Various modifications made within the scope of the claims and the equivalent scope of the invention are considered to be within the scope of the invention. [Explanation of Symbols]

[0056] 1. Distance measuring device 2 tapes 3 Mechanical trolley (moving object) 5. Computers (external devices) 11. Sensor unit (optical movement sensor) 12 Control Unit (Transmitter Unit) 13 Passage section 111 Sensing part 112 Sensor area (sensor surface) 114 Sensor-side connection area 115 Edge 116 Width support surface 121 Passage area (sensor-facing surface) 123 Control Unit Side Connection Area 125 Edge 128 Aperture 129 Nail area 130 Guide member 131 Entrance 132 Exit

Claims

1. A passage section through which a tape connected to a moving object passes, An optical travel sensor measures the distance traveled by irradiating light onto the tape as it passes through the passage section, The system includes a transmitting unit that collects the distance traveled by the optical movement sensor and transmits it to a display device, The travel distance measuring device wherein the passage portion is a space defined by a sensor surface on which the sensing portion of the optical travel amount sensor is provided, a sensor-facing surface opposite to the sensor surface, and a width-direction support surface connected to the sensor surface and the sensor-facing surface and supporting the tape in the width direction of the tape, and has a separation portion on the side opposite to the width-direction support surface.

2. The travel distance measuring device according to claim 1, further comprising a guide member having a guide surface for guiding the tape in the width direction on the side of the separated portion of the sensor-facing surface.

3. The travel distance measuring device according to claim 2, wherein the guide member is configured to become lower in the thickness direction of the tape from the side of the guide surface toward the side of the separation portion.

4. The travel distance measuring device according to claim 2 or 3, wherein the guide surface is in contact with the sensor surface.

5. The travel distance measuring device according to claim 4, further comprising a claw portion provided in an opening extending in the width direction on the sensor-facing surface, with one end fixed on the side of the width-direction support surface, the side of the separation portion being a free end, having a surface flush with the sensor-facing surface, and the guide member provided on the surface on the side of the free end.

6. The passage section includes an entrance and an exit for the tape. The travel distance measuring device according to claim 1, wherein at least one of the inlet and outlet is configured to widen in the width direction toward the outside of the passage portion.

7. The distance between the sensor surface and the sensor-facing surface is shorter than the entrance and exit points in the direction of movement of the tape at the position where the optical travel amount sensor is provided, according to claim 6.

8. The distance measuring device according to claim 1, wherein the optical distance sensor is recognized in the display device as a device of a different type from the user operation device.

9. A distance measuring system comprising a dynamics cart and a distance measuring device, The aforementioned distance measuring device is A passage section through which the tape connected to the aforementioned dynamics trolley passes, An optical travel sensor measures the distance traveled by irradiating light onto the tape as it passes through the passage section, A distance measurement system comprising: a transmitting unit that collects the distance traveled obtained by the optical distance sensor and transmits it to a display device.

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