Electronic ruler displacement detection system and electronic measuring tape
The electronic displacement detection system addresses measurement inaccuracies in tape measures by using signal stripes and photodetectors to enhance precision and accuracy.
Patent Information
- Application Number
- CN202422368660.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-27
AI Technical Summary
Existing tape measure is inaccurate when bending, and laser rangefinders are easily blocked, resulting in inaccurate measurements.
An electronic ruler displacement detection system is adopted, including a ruler, substrate, photoelectric sensor and processing circuit, to detect displacement through signal stripes and photoelectric sensors, and to combine the processing circuit to output digital signals to improve measurement accuracy.
Accurate measurement when the tape measure is bent, avoiding the error of the laser rangefinder being blocked, and improving the accuracy of displacement detection.
Smart Images
Figure CN223106900U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electronic ruler displacement detection systems, and particularly relates to an electronic ruler displacement detection system and an electronic tape measure. Background Art
[0002] In real life, it is often necessary to use measuring devices to perform counting and precise measurement of displacement data. Currently, the commonly used measuring device is a grating measuring system. From the 1950s to the 1980s of the last century, the grating measuring system developed from the inductosyn to the grating and the magnetic grating. These three measuring systems combine absolute measurement within one grating pitch period and incremental measurement outside the period, and the measuring unit is a common metric (or imperial) scale. They each have their own advantages. Since the comprehensive technical performance of the linear grating measuring system is superior to the other two, and the manufacturing cost is lower than that of the inductosyn and the magnetic grating, the linear grating has developed the fastest, with the highest technical performance, the highest market share, and the largest industry.
[0003] In the prior art, in order to achieve electronic displacement detection, some tape measures are provided with a laser rangefinder at the open end of their housing. However, this design is easily blocked, and if the tape measure body is bent, it will lead to inaccurate measurement. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide an electronic ruler displacement detection system, which can improve the accuracy of distance detection and can be installed in an electronic tape measure to ensure the accuracy of measurement.
[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide an electronic ruler displacement detection system, including a scale and a substrate. A plurality of signal stripes are arranged at equal intervals along the length direction on the surface of the scale, and the reflectivity of the surface of the signal stripes is different from that of the surface of the scale. On the surface of the substrate, there are a first photoelectric sensor, a second photoelectric sensor, a third photoelectric sensor, a processing circuit, and a connector electrically connected through electronic circuits. The first photoelectric sensor, the second photoelectric sensor, and the third photoelectric sensor are arranged in sequence along the length direction of the substrate. The first photoelectric sensor, the second photoelectric sensor, and the third photoelectric sensor each include a light-emitting element and a receiving element. The light-emitting element is arranged facing the surface of the scale provided with the signal stripes and is used for emitting light to the surface of the scale. The receiving element is used for receiving the light reflected back from the surface of the scale and converting it into an electrical signal. A processing circuit connected to the photoelectric sensors is further provided on the substrate. The processing circuit is used for processing the electrical signal and outputting a digital signal. The connector is connected to the processing circuit and is used for outputting the digital signal obtained by processing through the processing circuit.
[0006] Preferably, the processing circuit includes a first comparator and a second comparator. The inverting input terminal of the first comparator is respectively connected to the output terminals of the receiving elements of the first optoelectronic sensor and the third optoelectronic sensor, and its non-inverting input terminal is connected to the output terminal of the receiving element of the first optoelectronic sensor; the inverting input terminal of the second comparator is respectively connected to the output terminals of the receiving elements of the first optoelectronic sensor and the third optoelectronic sensor, and its non-inverting input terminal is connected to the output terminal of the receiving element of the second optoelectronic sensor.
[0007] Preferably, when the scale moves, the phase difference between the signals of two adjacent optoelectronic sensors is 90°.
[0008] Preferably, three variable resistors respectively connected to the first optoelectronic sensor, the second optoelectronic sensor, and the third optoelectronic sensor are further provided on the substrate, and the variable resistors are used to respectively adjust the light signal intensities emitted by the light-emitting elements of the first optoelectronic sensor, the second optoelectronic sensor, and the third optoelectronic sensor.
[0009] Preferably, the reflectance of the surface of the signal stripe is lower than that of the surface of the scale.
[0010] Preferably, the input end of the connector is respectively connected to the output terminals of the first comparator and the second comparator, and the output end of the connector is connected to an external computing device.
[0011] The present utility model further provides an electronic tape measure, including a housing and a tape measure. An opening for pulling out the tape measure is provided on one side of the housing, and any one of the above-mentioned electronic ruler displacement detection systems is provided at the opening. Among them, the scale is provided on the surface of the tape measure, and the substrate is provided at the opening of the housing.
[0012] Preferably, an external computing device for receiving the digital signal and calculating the displacement distance of the scale and a display screen for displaying the displacement distance of the scale are provided on the surface of the housing.
[0013] Beneficial effects
[0014] The present utility model can be applied to various devices that require accurate measurement of displacement length, such as electronic tape measures. It can directly detect the actual displacement of the tape measure elongation, avoid errors caused by indirect distance measurement, and can effectively improve the accuracy of displacement detection. Description of the drawings
[0015] Figure 1 It is a schematic structural diagram of an electronic ruler displacement detection system.
[0016] Figure 2 It is Figure 1 An enlarged schematic diagram of the substrate structure in
[0017] Figure 3 is Figure 1 the circuit schematic diagram of the processing circuit in
[0018] Figure 4 the waveform diagram of the signal intensity received by the optoelectronic sensor receiving element.
[0019] Figure 5 the waveform diagram of the output signal of the processing circuit.
[0020] Wherein, 1 - scale; 101 - signal stripe; 2 - substrate; 201 - optoelectronic sensor one; 2011 - light emitting element; 2012 - receiving element; 202 - optoelectronic sensor two; 203 - optoelectronic sensor three; 204 - processing circuit; 2041 - first comparator; 2042 - second comparator; 205 - connector; 206 - adjustable rheostat.
[0021] The same reference numerals in each figure represent the same component. Specific embodiments
[0022] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.
[0023] As Figure 1 shown, the present invention provides an electronic scale displacement detection system, including a scale 1 and a substrate 2. A plurality of signal stripes 101 are arranged at equal intervals along the length direction on the surface of the scale 1. The period of the signal stripes 101 is T. The reflectivity of the surface of the signal stripes 101 is different from that of the surface of the scale 1. In a specific embodiment, the reflectivity of the surface of the signal stripes 101 is lower than that of the surface of the scale 1.
[0024] On the surface of the substrate 2, there are an optoelectronic sensor one 201, an optoelectronic sensor two 202, an optoelectronic sensor three 203, a processing circuit 204 and a connector 205 electrically connected through electronic circuits. The optoelectronic sensor one 201, the optoelectronic sensor two 202 and the optoelectronic sensor three 203 are arranged in sequence along the length direction of the substrate 2. The optoelectronic sensor one 201, the optoelectronic sensor two 202 and the optoelectronic sensor three 203 all include a light emitting element 2011 and a receiving element 2012. The light emitting element 2011 is arranged facing the surface of the scale 1 provided with the signal stripes 101 and is used to emit light to the surface of the scale 1. The receiving element 2012 is used to receive the light reflected back from the surface of the scale 1 and convert it into an electrical signal (as Figure 1 shown by the arrow direction in
[0025] As shown Figure 2 in the figure, a processing circuit 204 connected to the photoelectric sensor is further provided on the substrate 2, and the processing circuit 204 is an IC chip. The processing circuit 204 is configured to process the electrical signal and output a digital signal, and the connector 205 is connected to the processing circuit 204 for outputting the digital signal processed by the processing circuit 204.
[0026] As shown Figure 3 in the figure, in a specific embodiment, the processing circuit 204 includes a first comparator 2041 and a second comparator 2042. The inverting input terminal of the first comparator 2041 is respectively connected to the output terminals of the receiving elements 2012 of the first photoelectric sensor 201 and the third photoelectric sensor 203, and its non-inverting input terminal is connected to the output terminal of the receiving element 2012 of the first photoelectric sensor 201; the inverting input terminal of the second comparator 2042 is respectively connected to the output terminals of the receiving elements 2012 of the first photoelectric sensor 201 and the third photoelectric sensor 203, and its non-inverting input terminal is connected to the output terminal of the receiving element 2012 of the second photoelectric sensor 202. The input terminal of the connector 205 is respectively connected to the output terminals of the first comparator 2041 and the second comparator 2042 for receiving the output signal A output by the first comparator 2041 and the output signal B output by the second comparator 2042. After integration, the output terminal of the connector 205 is connected to an external computing device.
[0027] The distances (period T) between the first photoelectric sensor 201, the second photoelectric sensor 202, and the third photoelectric sensor 203 can be finely adjusted. In a specific embodiment, as shown Figure 4 in the figure, the distances should be such that when the scale 1 moves, the phase difference between the signals of adjacent two photoelectric sensors is about 90° or -90°.
[0028] As shown Figure 5 in the figure, the external computing device can accurately measure the moving distance of the ruler by counting the pulses and calculating the phase difference between the output signals A and B. By counting the A or B signal, multiplying the count by the period T to obtain the moving distance, the displacement measurement is realized to obtain displacement data. In addition, the direction of displacement can be determined by the phase difference between A and B. For example, when the ruler moves in a certain direction, the phase difference between A and B is 90°, and when the direction is opposite, the phase difference between A and B is -90°.
[0029] A number of resistors and capacitors are also provided in the processing circuit 204. Those skilled in the art can arrange the electronic components at appropriate positions on the substrate 2 according to common sense or according to Figure 3 the circuit schematic diagram, which will not be elaborated here.
[0030] Three adjustable variable resistors 206 respectively connected to the first photoelectric sensor 201, the second photoelectric sensor 202, and the third photoelectric sensor 203 are further provided on the substrate 2. The adjustable variable resistors 206 are used to respectively adjust the light signal intensities of the light-emitting elements 2011 of the first photoelectric sensor 201, the second photoelectric sensor 202, and the third photoelectric sensor 203, so that the intensities and amplitudes of the light signals output by the light-emitting elements 2011 of the first photoelectric sensor 201, the second photoelectric sensor 202, and the third photoelectric sensor 203 are consistent.
[0031] Based on the above electronic ruler displacement detection system, the present utility model can further provide an electronic tape measure, which includes a housing and a tape measure with a conventional design. An opening for pulling out the tape measure is provided on one side of the housing. The above-mentioned electronic ruler displacement detection system is provided at the opening. Among them, the scale 1 is provided on the surface of the tape measure, and the substrate 2 is provided at the opening of the housing. In a specific embodiment, a display screen for displaying the displacement distance of the scale is provided on the surface of the housing. Connect the connector 205 to an external computing device with a display screen, and set the display screen on the surface of the housing. The display screen, the processing circuit of the substrate 2, etc. are all powered by a battery, and the overall device is small and portable.
Claims
1. An electronic ruler displacement detection system, comprising a scale and a substrate, characterized in that, A number of signal stripes are arranged at equal intervals along the length direction on the surface of the scale, and the reflectivity of the surface of the signal stripes is different from that of the surface of the scale. On the surface of the substrate, there are a first photoelectric sensor, a second photoelectric sensor, a third photoelectric sensor, a processing circuit and a connector which are electrically connected through electronic circuits. The first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor are arranged in sequence along the length direction of the substrate. The first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor all include a light-emitting element and a receiving element. The light-emitting element is arranged facing the surface of the scale provided with the signal stripes and is used for emitting light to the surface of the scale. The receiving element is used for receiving the light reflected back by the surface of the scale and converting it into an electrical signal. A processing circuit connected to the photoelectric sensors is further arranged on the substrate. The processing circuit is used for processing the electrical signal and outputting a digital signal. The connector is connected to the processing circuit and is used for outputting the digital signal obtained by processing by the processing circuit.
2. The displacement detection system of an electronic ruler according to claim 1, characterized in that, The processing circuit includes a first comparator and a second comparator. The inverting input terminal of the first comparator is respectively connected to the output terminal of the receiving element of the first photoelectric sensor and the output terminal of the receiving element of the third photoelectric sensor, and its non-inverting input terminal is connected to the output terminal of the receiving element of the first photoelectric sensor; the inverting input terminal of the second comparator is respectively connected to the output terminal of the receiving element of the first photoelectric sensor and the output terminal of the receiving element of the third photoelectric sensor, and its non-inverting input terminal is connected to the output terminal of the receiving element of the second photoelectric sensor.
3. An electronic ruler displacement detection system according to claim 1, characterized in that, When the scale moves, the phase difference of the signals between two adjacent photoelectric sensors is 90°.
4. An electronic ruler displacement detection system according to claim 1, characterized in that, Three adjustable resistors respectively connected to the first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor are further arranged on the substrate. The adjustable resistors are used for respectively adjusting the light signal intensities emitted by the light-emitting elements of the first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor.
5. An electronic ruler displacement detection system according to claim 1, characterized in that, The reflectivity of the surface of the signal stripes is lower than that of the surface of the scale.
6. The electronic ruler displacement detection system according to claim 2, characterized in that The input terminal of the connector is respectively connected to the output terminals of the first comparator and the second comparator, and the output terminal of the connector is connected to an external computing device.
7. An electronic tape measure, comprising a housing and a tape measure, wherein an opening for pulling out the tape measure is provided on one side of the housing, and it is characterized in that, An electronic ruler displacement detection system as described in any one of claims 1 to 6 is provided at the opening, wherein The scale is arranged on the surface of the tape measure, and the substrate is arranged at the opening of the housing.
8. An electronic tape measure according to claim 7, wherein, An external computing device for receiving the digital signal and calculating the displacement distance of the scale and a display screen for displaying the displacement distance of the scale are arranged on the surface of the housing.