Photoelectric encoder

Abstract

The invention relates to a photoelectric encoder. The photoelectric encoder comprises a circuit board, a rotating shaft, a code disc and a base, wherein the base comprises a bottom plate and a supporting plate; fixing components are symmetrically arranged on two sides of the annular supporting plate; each fixing component comprises a fixing plate, a driving rod, a first spring, a first handheld block and a locking part; each driving rod penetrates the annular supporting plate and is fixedly connected with the fixing plate; the first spring sleeves the middle portion of the driving rod; the two fixing plates are oppositely abutted against the outer wall of the lower part of the rotating shaft under the action of the first spring, so that a gap is reserved between the upper surface of the code disc and the lower surface of the circuit board; the driving rods are connected with the annular supporting plate through the locking parts. According to the design, a bearing is omitted through arrangement of the fixing components, the thickness of the encoder is effectively reduced while the air gap between the code disc and the photovoltaic conversion chip on the circuit board is ensured, the cost is saved, the volume is small, and the photoelectric encoder is more suitable for the requirement of miniaturization of a servo device.

Description

technical field [0001] The invention relates to the technical field of electronic measurement, in particular to a photoelectric encoder. Background technique [0002] Photoelectric encoder is a sensor that converts the mechanical geometric displacement of the output shaft into pulse or digital quantity through photoelectric conversion. It is mainly used in various numerical control equipment and is the most widely used sensor at present. Photoelectric encoder is mainly composed of code Composed of a disc and a photoelectric detection device, in the servo system, the code disc and the motor are coaxial so that the rotation of the motor drives the rotation of the code disc, and then a number of pulse signals are output through the photoelectric detection device, which can be calculated according to the number of pulses per second of the signal The current speed of the motor. One of the core problems of the incremental photoelectric encoder is to accurately ensure the air gap ...

AI Technical Summary

Problems solved by technology

One of the core problems of the incremental photoelectric encoder is to accurately ensure the air gap between the code disc and the photoelectric conversion chip on the circuit board. The integrated photoelectric encoder is the mainstream product in the servo market at present. For the integrated encoder Generally speaking, the upper and lower bearings are required to install the rotating shaft inside, so that the rotating shaft can rotate stably in the photoelectric encoder. The arrangement of the two bearings makes the overall shafting size of the photoelectric encoder easy to be fixed, resulting in its existence such as large volume, cost advanced defects

Images