Ternary system clobber-free number wheel code disk sensor

Abstract

A ternary non-clobber character wheel dial sensor includes a mechanical counter frame, a mechanical character wheel arranged on a shaft in the frame, flexile printed circuits inserted in the character wheel and a connecting bottom plate. The sensor is characterized in that the radial plane of the character wheel is zoned and coded according a ternary coding method. The left flexible printed circuit of the character wheel is equipped with three light emitting diodes for lighting. The relative position of the right flexible printed circuit is equipped with three receiving triodes for reading. The flexible printed circuit is electrically connected with a microprocessor through the connecting bottom plate bus. The beneficial effects of the invention are that binary code discs are substituted by ternary code discs. No clobber is on any position of a code disc. Compared with a present five bits binary code disc, the quantity of the photodiodes and photo triodes is reduced by two fifths. And the aims of simple structure, convenience, practicality and lowered cost are achieved. The invention can be applied various metering instruments using mechanical counter and absolute code angle displacement sensors.

Description

technical field [0001] The invention belongs to the photoelectric-digital conversion technology of code discs, and in particular relates to a character wheel code disc sensor which uses a ternary encoding method to photoelectrically convert digital quantities of a mechanical code disc into electrical signals for output. Background technique [0002] In the past ten years, a series of remote direct-reading water meters, gas meters, electricity meters, and products have come out. The Chinese patent "Character wheel code disc photoelectric digital intelligent sensor" (ZL.98203808.9) realizes the remote measurement function of the data displayed by the mechanical character wheel counter of the measuring instrument. It designs the character wheel as a photoelectric character wheel code wheel, inserts a frame-type photoelectric bus plug-in component in the character wheel gap, and uses the bus method to read the corresponding character wheel data from the code wheel sector. It is...

AI Technical Summary

Problems solved by technology

It can be seen from Table 1 that there are 3 binary numbers changing at the same time in each step, and there are many uncertain codes in the "transition state", and the possibility of garbled codes due to improper rotation of the character wheel is high

The actual use results still cannot completely eliminate garbled characters, but also increase software complexity and hardware costs

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