Multi-channel displacement sensor

Abstract

The utility model discloses a multichannel displacement sensor which comprises a substrate, a light receiving chip, a light emitting chip and a displacement ruler. The light receiving chips and the light emitting chips are installed on the substrate and electrically connected with the substrate through gold wires, the light receiving chips and the light emitting chips form a set of light receiving and emitting chip assemblies, the multiple sets of light receiving and emitting chip assemblies are arranged on the substrate at intervals, and each set of light receiving and emitting chip assembly faces the displacement ruler. A plurality of high reflection areas and a plurality of low reflection areas are formed on the face, facing the light receiving and emitting chip assembly, of the displacement ruler, the high reflection areas and the low reflection areas are arranged in a staggered mode, and emitted light rays emitted by the light emitting chips are reflected through the high reflection areas to form reflected light rays received by the light receiving chips. The utility model relates to the technical field of displacement sensors, and can solve the problem that a displacement sensor in the prior art is complex in structure and calculation and signal processing processes.

Description

Technical Field

[0001] The utility model relates to the technical field of displacement sensors, in particular to a multi-channel displacement sensor. Background Art

[0002] Displacement sensor is a measuring tool for linear displacement and other displacement distances. For example, Chinese invention patent CN109724519B discloses an absolute linear displacement sensor based on decimal shift coding, including a light-emitting element, a movable scale substrate, a fixed scale substrate, a photoelectric detector and a signal processing circuit. The movable scale substrate has an absolute code track and an incremental code track. The absolute code track is engraved with a decimal shift code, and the incremental code track is engraved with a uniformly distributed rectangular light-transmitting surface I. The light energy emitted by the light-emitting element forms a light illumination area with alternating light intensity to act on the absolute code track and the incremental code track; the fixed scale substrate has a long strip light-transmitting surface and four groups of light-transmitting surfaces, which are arranged in a specific spatial position; the photoelectric probe of the photoelectric detector outputs an electrical signal reflecting the absolute position, which is processed to obtain an absolute position value, and four photocurrent signals reflecting the incremental displacement are processed to obtain an incremental displacement value. The absolute position value and the incremental displacement value are added to obtain the absolute linear displacement value.

[0003] The displacement sensor realizes the measurement of linear displacement sensor based on encoding technology, and its structure, calculation and signal processing process are complicated, the cost is high, and it is easy to limit its application. Therefore, it is necessary to provide a multi-channel displacement sensor that can solve the problem of complex structure, calculation and signal processing process of displacement sensor in the prior art. Summary of the invention

[0004] The utility model aims to provide a multi-channel displacement sensor, which can solve the problems of the displacement sensor structure and the complicated calculation and signal processing processes in the prior art.

[0005] The utility model is achieved in this way:

[0006] A multi-channel displacement sensor comprises a substrate, a light-receiving chip, a light-emitting chip and a displacement ruler; the light-receiving chip and the light-emitting chip are mounted on the substrate and electrically connected to the substrate through gold wires, the light-receiving chip and the light-emitting chip form a group of light-receiving and light-emitting chip assemblies, several groups of light-receiving and light-emitting chip assemblies are arranged on the substrate at intervals, and each group of light-receiving and light-emitting chip assemblies is arranged facing the displacement ruler; a plurality of high-reflection areas and a plurality of low-reflection areas are formed on a surface of the displacement ruler facing the light-receiving and light-emitting chip assemblies, the high-reflection areas and the low-reflection areas are arranged alternately, so that the emission light emitted by the light-emitting chip is reflected by the high-reflection areas to form reflected light received by the light-receiving chip.

[0007] The substrate is formed with mutually independent light receiving grooves and light emitting grooves, and several groups of light receiving and light emitting chip assemblies are arranged in the light receiving grooves at intervals, and several groups of light emitting chip assemblies are arranged in the light emitting grooves at intervals, so that the light receiving chips and the light emitting chips are isolated from each other.

[0008] The light-collecting groove and the light-emitting groove penetrate upwardly through the top surface of the substrate and are arranged facing the high-reflection area and the low-reflection area of ​​the displacement ruler.

[0009] The arrangement direction of the light receiving chips of the several groups of light receiving and emitting chip assemblies in the light receiving grooves, the arrangement direction of the light emitting chips of the several groups of light receiving and emitting chip assemblies in the light emitting grooves and the displacement direction of the displacement ruler are parallel, and are perpendicular to the arrangement direction of the light receiving chips and the light emitting chips in each group of light receiving and emitting chip assemblies.

[0010] The plurality of high-reflection areas and the plurality of low-reflection areas are arranged along the displacement direction of the displacement ruler.

[0011] The number of the light-emitting and light-receiving chip components is an even number.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model is provided with a plurality of light-receiving and light-emitting chip components and a displacement ruler formed by light-receiving and light-emitting chips, and utilizes the cooperation of light-receiving and light-emitting chips with the alternating movement of high and low reflection areas to generate a stable multi-channel electrical signal, thereby obtaining the displacement direction and displacement distance of the displacement sensor through differential and calculation processing. The processing and calculation process is simple, ensuring accurate displacement measurement, and the number of channels can be expanded according to actual needs, so the application is more convenient and has a wider range of applications.

[0014] 2. The utility model is provided with several groups of light receiving and emitting chip assemblies, light receiving grooves and light emitting grooves. The light receiving grooves are used to install several groups of light receiving and emitting chip assemblies in intervals, and the light emitting grooves are used to install several groups of light receiving and emitting chip assemblies in intervals. This ensures that the light receiving chips and the light emitting chips will not interfere with each other. The utility model has a simple structure, a small size, and a low cost, which further expands the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a stereogram of the multi-channel displacement sensor of the utility model;

[0016] Figure 2 It is a three-dimensional diagram of the substrate and the light-receiving and light-emitting chip assembly in the multi-channel displacement sensor of the utility model;

[0017] Figure 3 This is the main view of the working principle of the multi-channel displacement sensor of the utility model;

[0018] Figure 4It is a side view of the working principle of the multi-channel displacement sensor of the utility model;

[0019] Figure 5 It is a graph of four approximate sinusoidal wave signals of the multi-channel displacement sensor of the utility model;

[0020] Figure 6 These are two output signal curves of the multi-channel displacement sensor of the utility model.

[0021] In the figure, 1 is a substrate, 11 is a light receiving groove, 12 is a light emitting groove, 2 is a light receiving chip, 21 is a reflected light, 3 is a light emitting chip, 31 is an emitted light, 4 is a displacement ruler, 41 is a high reflection area, 42 is a low reflection area, and 5 is a gold wire. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Please see attached Figure 1 To Attachment Figure 4 A multi-channel displacement sensor includes a substrate 1, a light-receiving chip 2, a light-emitting chip 3 and a displacement ruler 4; the light-receiving chip 2 and the light-emitting chip 3 are mounted on the substrate 1 and electrically connected to the substrate 1 through a gold wire 5, the light-receiving chip 2 and the light-emitting chip 3 form a group of light-receiving and light-emitting chip components, and several groups of light-receiving and light-emitting chip components are arranged on the substrate 1 at intervals, and each group of light-receiving and light-emitting chip components is arranged facing the displacement ruler 4; a plurality of high-reflection areas 41 and a plurality of low-reflection areas 42 are formed on a surface of the displacement ruler 4 facing the light-receiving and light-emitting chip components, and the high-reflection areas 41 and the low-reflection areas 42 are arranged alternately, so that the emission light 31 emitted by the light-emitting chip 3 is reflected by the high-reflection area 41 to form the reflected light 21 received by the light-receiving chip 2.

[0024] The light emitting chip 3 can emit an emission light 31, which shines on the high reflection area 41 of the displacement ruler 4, and can form a strong reflection light 21 that can be received by the light receiving chip 2 after diffuse reflection, so that the light signal is converted into an electrical signal through the light receiving chip 2, and output from the substrate 1 through the gold wire 5, forming a displacement sensor based on the light signal.

[0025] The low reflection area 42 is used to absorb light, so that when the emitted light 31 shines on the low reflection area 42, the reflected light 21 received by the light receiving chip 2 is relatively weak. As the displacement ruler 4 moves, the high reflection area 41 and the low reflection area 42 alternately pass over the substrate 1, so that the light receiving chip 2 can generate a corresponding electrical signal curve with varying strengths.

[0026] The light receiving chips 2 of several groups of spaced-apart light receiving and emitting chip assemblies can generate corresponding multiple electrical signal curves. The moving distance and moving direction of the displacement ruler 4 can be obtained by differential processing and simple calculation of the multiple electrical signal curves, thereby realizing the displacement sensing measurement function based on multi-channel electrical signal curves.

[0027] Please see attached Figure 1 and attached Figure 2 The substrate 1 is formed with mutually independent light receiving grooves 11 and light emitting grooves 12, and a plurality of light receiving chips 2 of light receiving and emitting chip assemblies are arranged at intervals in the light receiving grooves 11, and a plurality of light emitting chips 3 of light receiving and emitting chip assemblies are arranged at intervals in the light emitting grooves 12, so that the light receiving chips 2 and the light emitting chips 3 are isolated from each other.

[0028] The light-receiving slots 11 and the light-emitting slots 12 are used to separate the plurality of light-receiving chips 2 and the plurality of light-emitting chips 3 , so as to prevent the emitted light 31 from directly irradiating the light-receiving chip 2 without being reflected and affecting the accuracy of the displacement measurement result.

[0029] Please see attached Figure 1 and attached Figure 2 The light-receiving groove 11 and the light-emitting groove 12 penetrate upward through the top surface of the substrate 1 and are arranged facing the high-reflection area 41 and the low-reflection area 42 of the displacement ruler 4 to ensure that the emitted light 31 is irradiated to the high-reflection area 41 or the low-reflection area 42, and the reflected light 21 is reflected to the light-receiving chip 2 corresponding to the light-emitting chip 3.

[0030] Please see attached Figure 1 The arrangement direction of the light receiving chips 2 of the several groups of light receiving and emitting chip assemblies in the light receiving groove 11, the arrangement direction of the light emitting chips 3 of the several groups of light receiving and emitting chip assemblies in the light emitting groove 12 and the displacement direction of the displacement ruler 4 are parallel, and are perpendicular to the arrangement direction of the light receiving chips 2 and the light emitting chips 3 in each group of light receiving and emitting chip assemblies, thereby ensuring the effectiveness of light emission and reflection when the several groups of light emitting chip assemblies work alternately, so as to generate stable electrical signals.

[0031] Please see attached Figure 1 The plurality of high-reflection areas 41 and the plurality of low-reflection areas 42 are arranged along the displacement direction of the displacement ruler 4 to ensure that the alternatingly arranged high-reflection areas 41 and low-reflection areas 42 can cooperate with the plurality of groups of alternatingly working light-emitting and light-receiving chip components to produce a stable electrical signal curve.

[0032] The number of the light-emitting and light-receiving chip components is an even number, preferably four groups, to facilitate differential processing of every two electrical signal curves.

[0033] Please see attached Figure 1 To Attachment Figure 6 Taking a four-channel displacement sensor as an example, the working principle of the utility model is:

[0034] The four groups of light-receiving and light-emitting chip components are marked as A, B, A-, and B- in sequence. When the displacement ruler 4 moves, the four groups of light-receiving and light-emitting chip components can be controlled by the substrate 1 to work alternately to avoid mutual interference of optical signals.

[0035] The working process of each group of light-receiving and light-emitting chip components is as follows: the light-emitting chip 3 emits an emission light 31 upward, the emission light 31 is irradiated on the high-reflection area 41 and then reflected to the light-receiving chip 2 after diffuse reflection, the light-receiving chip 2 receives the reflected light 21 and converts the optical signal into an electrical signal, and the electrical signal can be output to an external device through the gold wire 5 via the substrate 1, and an approximate sinusoidal wave signal is obtained after curve processing.

[0036] When the four groups of light-receiving and light-emitting chip components work alternately, they generate four approximately sinusoidal wave signals, which are recorded as A, A-, B, and B-, respectively. Figure 5 The four approximately sinusoidal wave signals are differentially processed: A-(A-)=C, B-(B-)=D, and two stable output signal curves C and D are obtained, as shown in Figure 6 Through the calculation and subdivision of the two output signal curves C and D by the subsequent circuit, the displacement distance and displacement direction of the displacement ruler 4 can be obtained, realizing the multi-channel displacement sensing function.

[0037] According to the requirements of displacement ranging accuracy, the utility model can be expanded to dual-channel, six-channel and other structural forms. The more channels there are, the higher the measurement accuracy. The working principle remains unchanged and will not be repeated here.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-channel displacement sensor, characterized in that: The invention comprises a substrate (1), a light receiving chip (2), a light emitting chip (3) and a displacement ruler (4); the light receiving chip (2) and the light emitting chip (3) are mounted on the substrate (1) and electrically connected to the substrate (1) via a gold wire (5); the light receiving chip (2) and the light emitting chip (3) form a group of light receiving and light emitting chip components; a plurality of groups of light receiving and light emitting chip components are arranged at intervals on the substrate (1), and each group of light receiving and light emitting chip components is arranged facing the displacement ruler (4); a plurality of high reflection areas (41) and a plurality of low reflection areas (42) are formed on a surface of the displacement ruler (4) facing the light receiving and light emitting chip components; the high reflection areas (41) and the low reflection areas (42) are arranged in an alternating manner, so that the emission light (31) emitted by the light emitting chip (3) is reflected by the high reflection areas (41) to form the reflection light (21) received by the light receiving chip (2).

2. The multi-channel displacement sensor according to claim 1, characterized in that: The substrate (1) is formed with mutually independent light receiving grooves (11) and light emitting grooves (12); a plurality of light receiving chips (2) of light receiving and light emitting chip assemblies are arranged at intervals in the light receiving grooves (11); and a plurality of light emitting chips (3) of light receiving and light emitting chip assemblies are arranged at intervals in the light emitting grooves (12), so that the light receiving chips (2) and the light emitting chips (3) are arranged in isolation from each other.

3. The multi-channel displacement sensor according to claim 2, characterized in that: The light receiving groove (11) and the light emitting groove (12) penetrate upwards through the top surface of the substrate (1) and are arranged facing the high reflection area (41) and the low reflection area (42) of the displacement ruler (4).

4. The multi-channel displacement sensor according to claim 2, characterized in that: The arrangement direction of the light receiving chips (2) of the plurality of groups of light receiving and emitting chip assemblies in the light receiving groove (11), the arrangement direction of the light emitting chips (3) of the plurality of groups of light receiving and emitting chip assemblies in the light emitting groove (12) and the displacement direction of the displacement ruler (4) are parallel, and are perpendicular to the arrangement direction of the light receiving chips (2) and the light emitting chips (3) in each group of light receiving and emitting chip assemblies.

5. The multi-channel displacement sensor according to claim 1 or 3, characterized in that: The plurality of high-reflection areas (41) and the plurality of low-reflection areas (42) are arranged along the displacement direction of the displacement ruler (4).

6. The multi-channel displacement sensor according to any one of claims 1, 2 and 4, characterized in that: The number of the light-emitting and light-receiving chip components is an even number.

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