The linear scale and the structure of linear scale.！

linear scalse(grating ruler), also referred to as grating displacement sensor (encoder sensor), is the use of an optical grating feedback device measuring principle. Scale often used in CNC machine tools, closed-loop servo system, it can be used as the linear displacement or angular displacement detection. The measurement signal into a digital pulse output with detection range, high precision, fast response characteristics. For example, in CNC machine tools often used to coordinate the tool and the workpiece is detected, and to observe the effect of motion tracking error error passes to play a compensation tool.

Grating scale grating and the grating by reading the first two parts. Scale grating generally fixed on the machine moving parts, raster scanning head mounted on a fixed machine part, mounted on the index grating raster reading head. Grating structure is shown on the right.

A key part of the grating structure of the grating detection means detecting apparatus is a raster reading head, which consists of a light source, a converging lens, indicating gratings, optoelectronic components and adjustment mechanism and other components. Many forms of reading head grating structure, according to the reading head into the structural characteristics and use the occasion to directly receive formula Readhead (or silicon photocell reading head, mirrored reading head, type spectroscope reading head, metal grating reflective reading head).

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