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Single ring absolute coded disk

A single-turn absolute type and code disc technology, which is applied in the direction of converting sensor output, measuring devices, instruments, etc., can solve the problems of increasing the difficulty of assembly and adjustment process and reducing the structural size of the code disc, so as to realize miniaturization, reduce the structural size and The effect of volume, size reduction

Inactive Publication Date: 2008-01-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quasi-absolute code wheel combines the characteristics of the incremental and absolute code wheels, which reduces the number of code channels for position coding, reduces the structural size of the code wheel, and then reduces the structural size of the encoder with it as the core. But at the beginning, the first position code must be obtained through a self-guiding process, and if a higher number of digits is to be obtained, more photodetectors must be placed, which increases the difficulty of the assembly process

Method used

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Embodiment Construction

[0012] The present invention is implemented by the structure shown in FIG. 4 . The material is K9 glass, put the cleaned K9 glass into a vacuum coating machine for chrome plating; apply positive photoresist BP212; pre-bake for 1 min at a temperature of 100-110°C; expose with a GGZL1000 straight-tube ultraviolet high-pressure mercury lamp; Afterwards, at a temperature of 20±1°C, put it in a 0.5% sodium hydroxide solution for development for 5 minutes; post-bake for 20-30 minutes at a temperature of 120°C; put it in a cerium sulfate solution for 20 minutes; and finally Obtained after degumming with acetone. The exposure is completed on the circular engraving machine by making a perforated belt according to the pattern of the single-turn absolute code disc to control the exposure device.

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Abstract

The invention provides a one-turn absolute encoding disc and pertains to the photoelectric inspection technology. The disc comprises transparent and non-transparent code stripes that are arranged in alternative way. The encoder taking the disc as core uses a linear array CCD as a receiving and dividing element, one CCD window contains 7-8 graduations. By an acquiring card, the signals output by CCD are sent into a computer, by two-valued processing, the number of 0 and 1 contained in each CCD window are obtained, an integral 7 numbers are combined together. The group of the current location is obtained by looking up the table of group code; program is written according to the angle-positioning arithmetic and by using advanced computer language VB. In this way, the value of the rotation angle can be obtained. Wherein, the table of group code is established based on the codes obtained.

Description

1. Technical field: [0001] The invention belongs to a single-turn absolute code disc related to the technical field of photoelectric detection. 2. Background technology: [0002] The code disc has been widely used as the core component of the photoelectric displacement testing equipment, especially the photoelectric shaft encoder. The code disc is a circular indexing element engraved with a number of uniformly distributed light-transmitting or opaque grid lines on the circular area of ​​​​the glass or metal surface. The circles are arranged in a certain order. A radial position has only a unique binary or other binary code, so different digital codes can be output at different positions, and the angular position code output after processing is a single-valued function of the rotation angle. The code disc has the advantages of fixed zero point, strong anti-interference ability, no need to re-zero when restarting after power failure, and no cumulative error. [0003] The num...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
Inventor 陈赟
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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