A linear grating scale
A technology of linear grating and grating line, applied in the direction of converting sensor output, measuring device, instrument, etc., can solve the problems of high difficulty and waste of production cost, and achieve the effect of low cost, simple production and high measurement accuracy
Active Publication Date: 2017-04-19
ZHUHAI EASSON MEASUREMENT TECH +1
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Problems solved by technology
This is a waste of production cost, and the difficulty is relatively high
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[0019] Such as figure 1 and figure 2 As shown, in this embodiment, the present invention includes a main scale assembly and a moving reading part, a glass grating scale is arranged on the main scale assembly, and an incremental code track 1 and an absolute code are set on the glass grating scale. track 2, incremental grating lines 3 at equal intervals are arranged on the incremental code track 1, a scanning unit is arranged in the moving reading part, and the scanning unit includes a glass indicating grating, and the moving reading part is set It is on one side of the main scale assembly and can move back and forth along the length direction of the main scale assembly. Several groups of reference marks 4 are arranged at intervals on the absolute code track 2 and the glass indicating grating, and each group of the reference marks 4 corresponds to a unique distance code, and the distance code is obtained by a pseudo-random coding method. The scanning unit scans the glass grat...
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The invention aims to provide a linear grating ruler which is convenient to manufacture, low in cost and high in measuring accuracy. The linear grating ruler comprises a main ruler component and a mobile reading part, a glass grating ruler is arranged on the main ruler component, an increment code channel and an absolute code channel are arranged on the glass grating ruler, increment grating lines at equal intervals are arranged on the increment code channel, a glass indicating grating is arranged in the mobile reading part which is arranged on on side of the main ruler component and can move back and forth along the length direction of the same, a plurality of reference marks are arranged on each of the absolute code channel and the glass indicating grating at intervals, each reference mark corresponds to a unique distance code, a scanning unit generates reference signals according to the reference marks on the absolute code channel, and the reference signals refer to defined position and defined width of the absolute code channel relative to the increment code channel to obtain position of the increment code channel. The linear grating ruler can be applied in the field of measuring.
Description
technical field [0001] The invention relates to a measuring device, in particular to a linear grating ruler. Background technique [0002] Linear encoders are measurement feedback devices that work on the optical principle of gratings. Linear encoders are often used in machine tools, machining centers and measuring instruments. At present, most grating rulers only have one zero position. When this kind of grating ruler is applied to a large machine or instrument, it takes a lot of time to find the zero position and return to zero after the equipment is turned on. This brings great inconvenience to use. It is necessary to set multiple position reference points on the linear encoder. [0003] HEIDENHAIN has two linear tracks on the glass grating of the linear encoder, one is a periodic incremental linear track, and the other is a reference mark track. The fiducial mark track adopts the distance code arrangement method, and the position reference points are arranged on the ...
Claims
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IPC IPC(8): G01D5/347
Inventor 张传敏黄志良张松涛
Owner ZHUHAI EASSON MEASUREMENT TECH