Ternary system clobber-free number wheel code disk sensor

Abstract

The ternary non-garbled character wheel code wheel sensor includes a mechanical counter frame, a mechanical character wheel installed on the rotating shaft in the frame, a flexible circuit board inserted between the character wheels and a connecting base plate, and is characterized in that: The radial plane of the character wheel is coded according to the ternary coding method. Three light-emitting diodes are placed on the left flexible circuit board of the character wheel to emit light, and three receiving transistors are placed on the corresponding position of the right flexible circuit board to read codes. , the flexible circuit board is electrically connected to the microprocessor through the connecting backplane bus. Beneficial effects of the present invention: use a three-digit ternary code disk instead of a binary code disk to achieve no garbled codes at any position of the code disk. Compared with the current five-digit binary code disk, the number of photodiodes and phototransistors is reduced by 2 / 5, achieving The utility model has the advantages of simple structure, convenience and practicality, and the purpose of cost reduction. It can be applied to various measuring instruments using mechanical counters 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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