High-precision coder

Abstract

A high-precision coding wheel and a coder formed thereby, including a code wheel (1). The code wheel (1) is of cylindrical shape, with a through-hole (2) for inserting a rotation shaft (6) being provided on the cylinder axis thereof. The wheel surface of the code wheel (1) is provided with code strips (3) as much as possible, and each code strip (3) is parallel to the axis of the code wheel (1). By replacing a code disc with a coding wheel and providing code strips (3) on the wheel surface of the coding wheel, in the situation where the diameter is the same and the widths of the code strips (3) are the same, the number of the code strips (3) provided on the wheel surface of the code wheel (1) is far more than that of the code strips provided on a conventional code disc, which utilizes the radius of the code wheel (1) to the greatest extent, and therefore, the number of code strips which can be provided is maximized, improving the physical resolution of the coder with the same diameter to the greatest extent. In addition, by providing code strips(3) on the wheel surface of the code wheel (1) and by virtue of the code strip (3) being in the shape of a standard rectangle, the present invention can be well suited to small-diameter photoelectric coders.

Description

technical field [0001] The invention relates to a small-volume and high-precision encoder, in particular to a high-precision encoder wheel and the encoder formed therefrom. Background technique [0002] An encoder is a device that compiles and converts signals or data into signal forms that can be used for communication, transmission and storage. The encoder converts the angular displacement or the linear displacement into an electrical signal, the former becomes a code disc, and the latter is called a yardstick. According to the readout method, the encoder can be divided into two types: contact type and non-contact type. The contact type adopts the brush output, and the brush touches the conductive area or the insulating area to indicate whether the state of the code is "1" or "0"; the non-contact type accepts the sensitive element is a photosensitive element or a magnetic sensitive element, and when the photosensitive element is used, the transmission type The state of t...

AI Technical Summary

Problems solved by technology

Since the birth of the disc encoder, the method of setting the code bar on the side of the code disc has been used. Due to the limitation of the radius of the code disc, the inner and outer radii of the code bar set on the side of the code disc must be smaller than the diameter of the code disc, so its The equivalent radius of the midpoint of the inner and outer radii must be smaller than the radius of the code disc, which limits the number of code bars that can actually be set in the case of sensors with the same resolution; because the code bar of the traditional disc encoder is set on the side of the code disc, its code bar The distance between the code bar and the code bar is fan-shaped, limited by the ability of the photoelectric sensor, the difference between the inner and outer radius of the fan cannot be lower than a certain value, so the photoelectric type is greatly restricted on the small-diameter encoder, generally the diameter is smaller Small encoders can only use magnetoelectric, but magnetoelectric is much worse than photoelectric in terms of temperature adaptability and anti-electromagnetic interference

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