Reflection type encoder based on A and B signal output

Abstract

The utility model discloses a reflective encoder based on A and B signal output. The reflective encoder comprises a substrate, a light emitting end, a light receiving end, a light insulation structure, a code disc and a photosensitive diode. The light-emitting end and the light-receiving end are installed on the substrate in a separated mode through a light isolation structure, and the light-emitting end and the light-receiving end are both electrically connected with the substrate. The coded disc is rotatably arranged above the light-emitting end and the light-receiving end, a plurality of reflective stripes are formed on the coded disc at intervals, the photosensitive diodes are arranged in the light-receiving end in an array mode, and the reflective stripes face the light-emitting end and the photosensitive diodes. The utility model relates to the technical field of coding equipment, and can solve the problems of large use limitation and high requirement on installation precision of an optical encoder in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of encoding equipment, in particular to a reflective encoder based on A and B signal outputs. Background Art

[0002] Chinese utility model patent CN213455515U discloses an optical encoder component, which consists of an encoder mechanical unit and a photoelectric unit. The encoder mechanical unit includes a base and a cover, the photoelectric unit is a circuit board with an optical module, and the optical module includes a light-emitting element and a photosensitive element. The encoder mechanical unit is combined with the photoelectric unit circuit board through the base, and the encoder mechanical unit cooperates with the photoelectric unit to realize the generation of photoelectric signals.

[0003] The optical encoder assembly is connected to the optoelectronic unit circuit board through a mechanical unit via a base, which is large in size and has a small scope of application for mechanical installation, resulting in large limitations on the use of the optical encoder assembly; at the same time, mechanical connection has high requirements for installation accuracy. Therefore, it is necessary to provide a reflective encoder based on A and B signal outputs, which can solve the problems of large limitations on the use of optical encoders and high requirements for installation accuracy in the prior art. Summary of the invention

[0004] The purpose of the utility model is to provide a reflective encoder based on A and B signal outputs, which can solve the problems of large usage limitations and high installation precision requirements of optical encoders in the prior art.

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

[0006] A reflective encoder based on A and B signal output comprises a substrate, a light emitting end, a light receiving end, a light isolating structure, a code disk and a photosensitive diode; the light emitting end and the light receiving end are separated by the light isolating structure and installed on the substrate, and the light emitting end and the light receiving end are electrically connected to the substrate; the code disk is rotatably arranged above the light emitting end and the light receiving end, a plurality of reflective stripes are formed on the code disk at intervals, a plurality of groups of photosensitive diodes are arranged in an array in the light receiving end, and the reflective stripes are arranged facing the light emitting end and the plurality of groups of photosensitive diodes.

[0007] The code disc is in a disc-shaped structure, and a plurality of reflective stripes are arranged in a circle and coaxially arranged on the code disc.

[0008] Several groups of photosensitive diodes are arranged in a straight line array, so that when a certain reflective stripe rotates with the code disk to the upper area between the photosensitive diode and the light-emitting end, the reflected light is reflected on one group of photosensitive diodes to form a light stripe.

[0009] Each group of the photosensitive diodes comprises a plurality of photosensitive diode units arranged at equal intervals, the plurality of photosensitive diode units are arranged in a straight-line array, and light stripes are formed on the photosensitive diode units of the plurality of groups of photosensitive photosensitive diodes.

[0010] The arrangement period of the plurality of reflective stripes is T, the travel period of the light stripes is T1, and T1=M×T.

[0011] The photosensitive diode units at corresponding array positions in the plurality of groups of photosensitive diodes are arranged in parallel with a period T2.

[0012] The vertical distance between the central axes of two adjacent photosensitive diode units is (T2) / n, wherein n is the number of photosensitive diode units in each group of photosensitive diodes.

[0013] The light-emitting end includes a light-emitting chip and a light-emitting end package. The light-emitting chip is fixed on the substrate through conductive silver glue and electrically connected to the substrate through gold wire. The light-emitting chip is packaged on the substrate through the light-emitting end package and is located on one side of the light-isolating structure.

[0014] The light receiving end includes a light receiving chip and a light receiving end package. The light receiving chip is fixed on the substrate through conductive silver glue and electrically connected to the substrate through gold wires. The light receiving chip is packaged on the substrate through the light receiving end package and is located on the other side of the light isolation structure; a plurality of groups of photosensitive diodes are arranged on the top surface of the light receiving chip.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model is provided with a light-emitting end, a light-receiving end, a code disk and a photosensitive diode. The light-emitting end emits a light beam to the code disk, and the reflection stripes of the code disk reflect the light beam to the photosensitive diode on the light-receiving end. As the code disk rotates, the reflected light forms moving light stripes on each group of photosensitive diodes. Each photosensitive diode unit converts the light signal into an electrical signal, and a square wave signal is obtained after curve processing of the electrical signal. A stable square wave signal can be generated to realize a coding function based on light reflection. The utility model has a simple structure and excellent signal. The utility model can be widely used in servo motors, stepper motors, printers, sewing machines, displacement detection equipment, angle detection equipment and other equipment.

[0017] 2. The utility model is provided with a substrate, a light-emitting end, a light-receiving end and a light-isolating structure. The light-emitting end and the light-receiving end are packaged on the substrate. The light-emitting end and the light-receiving end are electrically connected to the substrate and separated by the light-isolating structure. This ensures that the light-emitting function of the light-emitting end and the light-receiving function of the light-receiving end do not affect each other, and also greatly reduces the size of the entire product. The substrate can be installed on the equipment that needs to be encoded by mounting, reflow soldering, etc., allowing a larger installation tolerance and a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the front view of the reflective encoder based on A and B signal output of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the code disk in the reflective encoder based on A and B signal output of the utility model;

[0020] Figure 3 It is a top view of the light receiving chip in the reflective encoder based on A and B signal output of the utility model;

[0021] Figure 4 It is the electrical signal curve diagram of the photodiode units A+, B+, A-, and B- in the reflective encoder based on the A and B signal outputs of the utility model;

[0022] Figure 5 It is a graph of electrical signals calculated by the reflective encoder based on the A and B signal outputs of the utility model;

[0023] Figure 6 It is a square wave signal diagram of the reflective encoder based on A and B signal outputs of the utility model.

[0024] In the figure, 1 is a substrate, 2 is a light emitting end, 201 is an emitted light, 202 is a reflected light, 203 is a light emitting chip, 204 is a light emitting end package, 3 is a light receiving end, 301 is a light receiving chip, 302 is a light receiving end package, 4 is a light isolation structure, 5 is a code disk, 501 is a reflective stripe, and 6 is a photosensitive diode. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Please see attached Figure 1 and attached Figure 2 A reflective encoder based on A and B signal output includes a substrate 1, a light-emitting end 2, a light-receiving end 3, a light-isolating structure 4, a code disk 5 and a photosensitive diode 6; the light-emitting end 2 and the light-receiving end 3 are separated and installed on the substrate 1 by the light-isolating structure 4, and the light-emitting end 2 and the light-receiving end 3 are both electrically connected to the substrate 1; the code disk 5 is rotatably arranged above the light-emitting end 2 and the light-receiving end 3, and a plurality of reflective stripes 501 are formed on the code disk 5 at intervals, and a plurality of groups of photosensitive diodes 6 are arranged in an array in the light-receiving end 3, and the reflective stripes 501 are arranged facing the light-emitting end 2 and the plurality of groups of photosensitive diodes 6.

[0027] The light emitting end 2 is used to emit a light beam to the code disk 5, and the light beam is reflected to the photodiode 6 in the light receiving end 3 through the reflective stripes 501, so that the light signal is converted into an electrical signal by the photodiode 6. Each group of photodiodes 6 can be divided into two groups, A and B, to output electrical signals, so as to realize the encoding function based on the output of A and B signals. The light isolation structure 4 can be made of opaque or light absorbing materials, and is used to form a light barrier between the light emitting end 2 and the light receiving end 3, so as to prevent the light beam of the light emitting end 2 from directly irradiating the light receiving end 3 and interfering with the encoding function, and ensure the excellent quality of the electrical signal.

[0028] The light-emitting end 2 and the light-receiving end 3 are packaged on a substrate 1, and the substrate 1 can be fixedly installed on various devices that require encoding functions by mounting, reflow soldering, etc., such as servo motors, stepper motors, printers, sewing machines, displacement detection equipment, angle detection equipment, etc., which can reduce the product size, facilitate and simplify installation, and allow a larger installation tolerance.

[0029] Please see attached Figure 2 The code disc 5 is in a disc-shaped structure, and a plurality of reflective stripes 501 are arranged in a circle and are coaxially arranged on the code disc 5 .

[0030] The code disk 5 can realize the rotation control of the specified direction and speed through the motor and other equipment, so that the code disk 5 drives the plurality of reflective stripes 501 to move above the light-emitting end 2 and the light-receiving end 3, so that the reflective stripes 501 reflect the light to different photosensitive diodes 6 in the light-receiving end 3. When the code disk 5 rotates, the plurality of reflective stripes 501 pass above the light-emitting end 2 and the light-receiving end 3 in sequence.

[0031] Please see attached Figure 1 and attached Figure 3 The plurality of groups of photodiodes 6 are arranged in a straight line array, so that when a certain reflective stripe 501 rotates with the code disk 5 to the upper area between the photodiode 6 and the light-emitting end 2, the reflective stripe 501 receives the emitted light 201 from the light-emitting end 2 and reflects the reflected light 202 to one of the groups of photodiodes 6, forming a light stripe.

[0032] By utilizing the reflective stripes 501 at different positions and the rotation of the reflective stripes 501, the reflected light 202 can be reflected onto group A or group B photodiodes of different photosensitive diodes 6, so that as the code disk 5 rotates, the light stripes formed by the reflected light 202 on several groups of photosensitive diodes 6 move synchronously.

[0033] Please see attached Figure 1 Attached Figure 3 Each group of the photosensitive diodes 6 includes a plurality of photosensitive diode units arranged at equal intervals, the plurality of photosensitive diode units are arranged in a straight-line array, and light stripes are formed at intervals on the photosensitive diode units of the plurality of groups of photosensitive diodes 6.

[0034] Each photodiode unit can receive the reflected light 202 and convert the optical signal of the reflected light 202 into an electrical signal. Converting the optical signal into an electrical signal by using a photodiode unit is a conventional method in the art, and its conversion process and working principle are not described here. Multiple photodiode units constitute group A and group B photodiodes, which output electrical signals respectively.

[0035] The arrangement period of the plurality of reflective stripes 501 is T, the formation period of the light stripes is T1, and T1=M×T, wherein M is a natural number, and the value of M can be adaptively selected according to actual coding function requirements.

[0036] The photosensitive diode units at corresponding array positions in the plurality of groups of photosensitive diodes 6 are arranged in parallel with a period T2, preferably, T1=T2.

[0037] The formation period T1 of the light stripes and the arrangement period T2 of the photodiode units can be adaptively adjusted according to actual encoding requirements, and can be set to T1=T2, or T1=2×T2, etc.

[0038] The vertical distance between the central axes of two adjacent photosensitive diode units is (T2) / n, wherein n is the number of photosensitive diode units in each group of photosensitive diodes 6 .

[0039] The center distance between two adjacent photosensitive diode units is (T2) / n. When T1=T2, as the code disk 5 rotates at a uniform speed, the reflected light 202 can form light stripes on the photosensitive diode units, and the light stripes move along the first photosensitive diode unit of each group of photosensitive diodes 6 to form a first electrical signal curve, and the light stripes move along the second photosensitive diode unit of each group of photosensitive diodes 6 to form a second electrical signal curve, and so on, forming n electrical signal curves in sequence, and using the n electrical signal curves to generate a square wave signal, that is, a coding signal curve.

[0040] Please see attached Figure 1 The light-emitting end 2 includes a light-emitting chip 203 and a light-emitting end package 204. The light-emitting chip 203 is fixed on the substrate 1 through conductive silver glue and electrically connected to the substrate 1 through gold wire. The light-emitting chip 203 is packaged on the substrate 1 through the light-emitting end package 204 and is located on one side of the light-isolating structure 4.

[0041] The light-emitting end package 204 can be made of transparent epoxy glue, which is convenient for packaging the light-emitting chip 203 without affecting the light-emitting chip 203 from emitting light 201. The light-emitting chip 203 is electrically connected to the substrate 1 through conductive silver glue and gold wire to ensure the transmission of electrical signals of the product.

[0042] Please see attached Figure 1The light receiving end 3 includes a light receiving chip 301 and a light receiving end package 302. The light receiving chip 301 is fixed on the substrate 1 through conductive silver glue and electrically connected to the substrate 1 through gold wire. The light receiving chip 301 is packaged on the substrate 1 through the light receiving end package 302 and is located on the other side of the light isolation structure 4; a plurality of groups of photosensitive diodes 6 are arranged on the top surface of the light receiving chip 301.

[0043] The light receiving end package 302 can be made of transparent epoxy glue, which is convenient for packaging the light receiving chip 301 and does not affect the light receiving chip 301 receiving the reflected light 202. The light receiving chip 301 is electrically connected to the substrate 1 through conductive silver glue and gold wire to ensure the electrical signal transmission of the product.

[0044] Preferably, the top surfaces of the light-emitting end 2 , the light-receiving end 3 and the light-isolating structure 4 are of the same height.

[0045] Please see attached Figure 1 To Attachment Figure 6 , the working process and working principle of the utility model are:

[0046] After the substrate 1 is installed on the product, the code disc 5 is installed above the product at a certain height, with the side with the reflective stripes 501 facing the product. The installation height of the code disc 5 relative to the light-emitting end 2 and the light-receiving end 3 is adjusted according to the emission and reflection requirements of the light.

[0047] The light emitting chip 203 of the light emitting end 2 emits a light beam, i.e., an emission light 201, to the code disc 5. When the code disc 5 rotates, when a reflective stripe 501 rotates to the upper part between the light emitting end 2 and the light receiving end 3, a certain emission light 201 is irradiated on the reflective stripe 501, and other emission light 201 is absorbed by the code disc 5 or reflected to the area outside the photosensitive diode 6.

[0048] The reflected light 202 is reflected to one of the photodiode units on the top surface of the light receiving chip 301 in the light receiving end 3 by the reflective stripes 501, forming light stripes. After receiving the reflected light 202, the photodiode unit converts the optical signal into an electrical signal.

[0049] Each group of photosensitive diodes 6 includes four photosensitive diode units arranged in a straight line, namely A+, B+, A-, and B-. The photosensitive diode units A+ in each group of photosensitive diodes 6 are arranged in parallel with a period of T2, the photosensitive diode units B+ in each group of photosensitive diodes 6 are arranged in parallel with a period of T2, the photosensitive diode units A- in each group of photosensitive diodes 6 are arranged in parallel with a period of T2, the photosensitive diode units B- in each group of photosensitive diodes 6 are arranged in parallel with a period of T2, the vertical spacing between the central axes of two adjacent photosensitive diode units is (T2) / 4, the arrangement period of the reflective stripes 501 on the code disk 5 is T, the formation period of the light stripes is T1, and T1=T2.

[0050] As the code disk 5 rotates, the light stripes move relatively on the upper surface of the photodiode array at the same time. The electrical signals of the photodiode units A+, B+, A-, and B- are shown in the attached figure. Figure 4 As shown, the signal output based on A and B is realized. Photodiode unit A+ is connected to photodiode unit A-, and photodiode unit B+ is connected to photodiode unit B-. The calculated electrical signal is as shown in the attached figure. Figure 5 As shown. Figure 5 The electrical signals shown are processed into square wave signals, as shown in the attached Figure 6 As shown, the encoding function based on A and B signal output is realized, which can be applied to servo motors, stepper motors, printers, sewing machines and other equipment, and can also be used for displacement detection equipment, angle detection equipment, etc.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope 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 protection scope of the present invention.

Claims

1. A reflective encoder based on A and B signal output, characterized by: The invention comprises a substrate (1), a light-emitting end (2), a light-receiving end (3), a light-isolating structure (4), a code disk (5) and a photosensitive diode (6); the light-emitting end (2) and the light-receiving end (3) are separated and mounted on the substrate (1) by the light-isolating structure (4), and the light-emitting end (2) and the light-receiving end (3) are both electrically connected to the substrate (1); the code disk (5) is rotatably arranged above the light-emitting end (2) and the light-receiving end (3), a plurality of reflective stripes (501) are formed at intervals on the code disk (5), and a plurality of groups of photosensitive diodes (6) are arranged in an array in the light-receiving end (3), and the reflective stripes (501) are arranged facing the light-emitting end (2) and the plurality of groups of photosensitive diodes (6).

2. The reflective encoder based on A and B signal output according to claim 1, characterized in that: The code disc (5) is in a disc-shaped structure, and a plurality of reflective stripes (501) are arranged in a circular pattern and are coaxially arranged on the code disc (5).

3. The reflective encoder based on A and B signal output according to claim 2, characterized in that: A plurality of groups of photosensitive diodes (6) are arranged in a straight line array, so that when a certain reflective stripe (501) rotates with the code disk (5) to the upper area between the photosensitive diode (6) and the light-emitting end (2), the reflected light (202) is reflected on one of the groups of photosensitive diodes (6) to form a light stripe.

4. The reflective encoder based on A and B signal output according to claim 3 is characterized in that: Each group of photosensitive diodes (6) comprises a plurality of photosensitive diode units arranged at equal intervals, the plurality of photosensitive diode units being arranged in a straight-line array, and light stripes are formed at intervals on the photosensitive diode units of a plurality of groups of photosensitive diodes (6).

5. The reflective encoder based on A and B signal output according to claim 3, characterized in that: The arrangement period of the plurality of reflective stripes (501) is T, the formation period of the light stripes is T1, and T1=M×T.

6. The reflective encoder based on A and B signal output according to claim 3, characterized in that: The photosensitive diode units at corresponding array positions in the plurality of groups of photosensitive diodes (6) are arranged in parallel at a period T2.

7. The reflective encoder based on A and B signal output according to claim 6, characterized in that: The vertical distance between the central axes of two adjacent photosensitive diode units is (T2) / n, wherein n is the number of photosensitive diode units in each group of photosensitive diodes (6).

8. The reflective encoder based on A and B signal output according to claim 1 or 3, characterized in that: The light-emitting end (2) comprises a light-emitting chip (203) and a light-emitting end package (204); the light-emitting chip (203) is fixed on the substrate (1) by means of conductive silver glue and is electrically connected to the substrate (1) by means of a gold wire; the light-emitting chip (203) is packaged on the substrate (1) by means of the light-emitting end package (204) and is located on one side of the light-isolating structure (4).

9. The reflective encoder based on A and B signal output according to claim 1, characterized in that: The light receiving end (3) comprises a light receiving chip (301) and a light receiving end package (302); the light receiving chip (301) is fixed on the substrate (1) by means of conductive silver glue and is electrically connected to the substrate (1) by means of a gold wire; the light receiving chip (301) is packaged on the substrate (1) by means of the light receiving end package (302) and is located on the other side of the light isolation structure (4); and a plurality of groups of photosensitive diodes (6) are arranged on the top surface of the light receiving chip (301).

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