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A Vernier Absolute Photoelectric Encoder Single Turn Absolute Position Reading Device and Method

A photoelectric encoder and absolute position technology, which is applied in the direction of measuring devices, instruments, and conversion sensor outputs, etc., can solve problems such as difficult coding tasks, solve the problem of high-resolution position information reading, and realize the effect of miniaturized applications

Active Publication Date: 2021-11-23
BEIJING JINGDIAO GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional encoders are difficult to meet the above requirements, and it is difficult to perform encoding tasks in these applications

Method used

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  • A Vernier Absolute Photoelectric Encoder Single Turn Absolute Position Reading Device and Method
  • A Vernier Absolute Photoelectric Encoder Single Turn Absolute Position Reading Device and Method
  • A Vernier Absolute Photoelectric Encoder Single Turn Absolute Position Reading Device and Method

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Embodiment Construction

[0017] combine Figure 1-Figure 2 , a single-turn absolute position reading device of a vernier absolute photoelectric encoder, comprising a light-emitting element 1, a grating code disc 2, a photoelectric sensor chip 3, and an electrical signal processing device 4. There are three circles of code tracks on the grating code disc 2, which are respectively the main code track, the vernier code track, the segment code track, and the three circle code tracks respectively have , , A reticle contains a certain phase relationship. The photoelectric sensor chip 3 installed on the electrical signal processing device 4 has three groups of patterns in the radial direction, corresponding to the engraved lines of the three circles of the grating code disc 2, receiving light from the light-emitting element 1 and passing through the grating code. The light from the disk and the slit is converted into an electrical signal, and the sine and cosine signals of different phases are output a...

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Abstract

The invention relates to a single-turn absolute position reading device and method of a vernier absolute photoelectric encoder, which solves the problem of reading position information of small-volume encoders in practical applications without increasing the number of physical engraved lines of the encoder. The rate is high, and it meets the requirement that the initial absolute position can be obtained immediately after power-on. The device includes a light-emitting element, a grating code disc, a photoelectric sensor chip and an electrical signal processing device. The photoelectric sensor chip receives light from the light-emitting element and passes through the grating code disc and the slit, and converts the received light signal into three The channel differential sine and cosine voltage signals are amplified and adjusted by the electrical signal processing device, quantized and calibrated, and subdivided and processed to obtain the phase angles of the three-channel electrical signals corresponding to the current position. A single-turn absolute position reading method of a vernier absolute photoelectric encoder is used in the invention. According to the phase angle and its difference, a unique single-turn absolute position value is spliced ​​and sent out in a serial data format.

Description

technical field [0001] The invention relates to a vernier absolute photoelectric encoder, more specifically, it relates to a single-turn absolute position reading device and method of a vernier absolute photoelectric encoder. Background technique [0002] Photoelectric encoders are sensors that convert mechanical angular displacement (angle or length) into electrical signals, and are widely used in industrial fields such as CNC machine tools and robots to obtain position and speed information. [0003] There are two types of photoelectric encoders: incremental and absolute. The incremental encoder has a simple structure and can provide relative position, but it needs to provide a zero point for reference positioning, that is, the absolute position coordinates can only be established after the operation of searching for the reference point Z signal is performed first after power-on. Compared with the incremental encoder, the position of the absolute encoder is uniquely deter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/347
CPCG01D5/347
Inventor 仲婷婷石忠东
Owner BEIJING JINGDIAO GRP CO LTD
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