TWI506250B - Angle detection method of angle encoder - Google Patents

Description

Angle encoder angle detection method

The invention relates to a detection method, in particular to an angle detection method of an angle encoder.

In the precision machinery industry, high-precision five-axis machining machines, CNC lathes, CNC milling machines, etc. are often used. In addition to accurate displacement detection, the aforementioned machining machines must also have accurate angular rotation detection. Only to achieve precise processing needs.

In the past, a method for detecting an angle, as disclosed in the patent application TW 92132177, is to provide a synchronous rotating main grating on the turntable, and a fixed sub-grating on the optical reading head, and a light source above the main grating. The emitted light is received by the optical pickup after passing through the main grating and the sub-grating. After analyzing the light and dark changes of the light, the rotation angle of the turntable can be known.

However, the complexity of the structure of the previously disclosed patent requires the use of special parts, that is, the additional processing of the main grating and the sub-grating is required to achieve the purpose of detecting the angle.

Therefore, an angle detecting method for an angle encoder which can simplify the structure and can also accurately detect the rotation angle is currently relevant to the relevant industry. One of the research and development goals.

Accordingly, it is an object of the present invention to provide an angle detecting method for an angle encoder that can accurately detect the angle of rotation.

Therefore, the angle detecting method of the angle encoder includes the following steps: (A) preparation: preparing an angle encoder, the angle encoder comprising a turntable and a fixed disk which are arranged in parallel and share a rotating shaft The angle encoder further includes an angle detecting device, and the turntable rotates relative to the fixed disk; (B) rotates: the turntable rotates at an angle with respect to the fixed disk; (C) illumination: the angle detecting device is mounted on the angle On the fixed disk, the angle detecting device comprises a laser light source, a capturing unit and a micro processing unit, and the laser light source illuminates the surface of the rotating disk to strengthen the characteristic of the track on the surface of the rotating plate; (D) Capture: the capture unit receives the reflected light of the laser light source, and extracts a laser spot image on the surface of the turntable; and (E) image processing: the micro processing unit calculates the image based on the feature image on the surface of the turntable The angle of rotation of the turntable.

The utility model has the advantages that the laser spot characteristic image generated by the existing trace on the surface of the turntable is supplied to the micro processing unit for calculation of the rotation angle, and no additional processing or special parts are used, so that a lot of manufacturing costs can be saved.

1‧‧‧ Angle detection device

100‧‧‧Preparation steps

11‧‧‧Laser light source

200‧‧‧Rotation steps

12‧‧‧Capture unit

300‧‧‧Lighting steps

121‧‧‧Optical components

400‧‧‧Select steps

122‧‧‧Photosensitive element

500‧‧‧Image processing steps

13‧‧‧Microprocessing unit

600‧‧‧Building database steps

2‧‧‧Angle encoder

700‧‧‧Create instant feature image steps

21‧‧‧ shaft

22‧‧‧ Turntable

23‧‧‧ Fixed disk

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a flow chart illustrating a first preferred embodiment of the angle detecting method of the angle encoder of the present invention. FIG. 2 is a schematic view showing a turntable, a fixed disk, and an angle detecting device of the first preferred embodiment; and FIG. 3 is a schematic view showing the component arrangement relationship of the first preferred embodiment Figure.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 and FIG. 2, in a first preferred embodiment of the angle detecting method of the angle encoder of the present invention, the angle encoder 2 includes a turntable 22 and a fixed disk 23 which are arranged in parallel and share a rotating shaft 21, and the rotating disk 22 is rotated relative to the fixed disk 23. The angle encoder 2 further comprises an angle detecting device 1 which can be mounted on a processing machine or other mechanism that needs to detect an angle.

Referring to FIG. 3, the angle detecting device 1 is mounted on the fixed disk 23. The angle detecting device 1 includes a laser light source 11, a capturing unit 12, and a micro processing unit 13, wherein the capturing unit 13 The unit 12 includes an optical component 121 for converting a laser spot image into a digital signal, and a micro processing unit 13 for calculating a displacement of the turntable 22 relative to the fixed disk 23. And converted to an angle Out.

First, a preparation step 100 is performed: preparing the angle encoder 2.

Next, a turning step 200 is performed: the turntable 22 is rotated by an angle with respect to the fixed disk 23.

Successively, an illumination step 300 is performed in which the laser source 11 of the angle detecting device 1 irradiates the surface of the turntable 22 with light to enhance the characteristic of the surface of the turntable 22.

Then, a capturing step 400 is performed: the capturing unit 12 receives the reflected light of the laser light source 11 and extracts a laser spot image on the surface of the turntable 22, and it is worth mentioning that the surface of the turntable 22 is Different texture features at different locations, so the resulting laser spot feature images are also different from each other.

Finally, an image processing step 500 is performed: the micro processing unit 13 calculates the displacement amount of the turntable 22 relative to the fixed disk 23 according to the feature image on the surface of the turntable 22, and converts it into an angular output.

It is further explained that the micro processing unit 13 can compare the rotation angle of the turntable 22 according to the absolute position ratio, and can also use the incremental displacement amount ratio to align the rotation angle of the turntable 22.

If the micro processing unit 13 is to compare the rotation angle of the turntable 22 according to the absolute position ratio, it is necessary to perform a step 600 of establishing a database: the surface of the turntable 22 is divided into a plurality of regions, and the regions are Feature images are stored in a database. In the image processing step, the micro processing unit 13 compares the feature image with the library feature image to calculate the rotation angle of the turntable 22.

If the micro-processing unit 13 is to use the incremental displacement ratio to align the rotation angle of the turntable 22, it is necessary to perform a step 700 of establishing an instant feature image: the micro-processing unit 13 stores the feature image before the rotation of the turntable 22 . In the image processing step, the micro processing unit 13 shifts the amount of the feature image before and after the rotation of the turntable 22 to calculate the rotation angle of the turntable 22.

In summary, since the surface of the turntable 22 has different texture features at different positions, the generated laser spot image images are also different from each other, and the micro processing unit 13 can also be based on different laser spot characteristics. The image is compared to calculate the rotation angle of the turntable 22, that is, there is no need to additionally process the turntable 22 or use special parts to be mounted on the turntable 22, so that a lot of manufacturing costs can be saved, so the book can be achieved. The purpose of the invention.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

1‧‧‧ Angle detection device

11‧‧‧Laser light source

12‧‧‧Capture unit

121‧‧‧Optical components

122‧‧‧Photosensitive element

13‧‧‧Microprocessing unit

2‧‧‧Angle encoder

22‧‧‧ Turntable

Claims (3)

An angle detecting method for an angle encoder, the angle detecting method comprising the following steps: (A) preparing: preparing an angle encoder, the angle encoder comprising a turntable and a fixed disk which are arranged in parallel and share a rotating shaft, The angle encoder further includes an angle detecting device, and the turntable rotates relative to the fixed disk; (B) rotates: the turntable rotates at an angle with respect to the fixed disk; (C) illumination: the angle detecting device is mounted on the fixed disk The angle detecting device comprises a laser light source, a capturing unit and a micro processing unit, wherein the laser light source illuminates the surface of the rotating surface to strengthen the characteristic of the surface of the rotating surface; (D) capturing : the capturing unit receives the reflected light of the laser light source, and extracts a laser spot image on the surface of the turntable; and (E) image processing: the micro processing unit calculates the image according to the feature image on the surface of the turntable The angle of rotation of the turntable. The angle detecting method of the angle encoder according to claim 1, further comprising a step (F) before the step (B), establishing a database: dividing the dial into a plurality of regions, and performing feature images of the regions Stored in the database, in the step (E), the micro processing unit compares the feature image with the database feature image to calculate the rotation angle of the turntable. The angle detecting method of the angle encoder according to claim 1, wherein the step (B) further comprises a step (G) of establishing an instant feature image: the micro processing unit stores the feature image before the rotating of the rotating disk, the step In (E), the micro processing unit shifts the amount of the feature image before and after the rotation of the turntable to calculate the rotation angle of the turntable.