Absolute position length measurement type encoder
a technology of absolute position length and encoder, which is applied in the direction of converting sensor output optically, instruments, measurement devices, etc., can solve the problems of reducing the degree of freedom of selection of light-receiving elements, adversely affecting the size and performance of absolute position length measurement type encoder, and the production cost. , to achieve the effect of reducing the minimum line width, reducing the cost of production, and reducing the accuracy
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embodiment 1
[0051]Embodiment 1 according to the present invention will be described using FIG. 1 through FIG. 4. FIG. 1 is a schematic view showing the entirety of an absolute position length measurement type encoder of the present invention, FIG. 2 is a perspective view schematically showing the relationship between a light-emitting element, a scale and a light-receiving element, and FIG. 3 is a schematic view showing the scale, FIG. 4 is a schematic view of a light-receiving element.
[0052]First, a brief description is given of the entire configuration of the present embodiment.
[0053]Mainly as shown in FIG. 1, an absolute position length measurement type encoder 100 includes
[0054]a scale 102 (Refer to FIGS. 2 and 3) in which an ABS pattern 104 based on a pseudorandom code is provided,
[0055]a light-receiving element 112 for receiving bright and dark patterns formed by the scale 102 and
[0056]a signal processing circuit 118 for processing signals subjected to output of the light-receiving elemen...
embodiment 2
[0083]Next, a description is given of Embodiment 2 according to the present invention with reference to FIG. 5 through FIG. 7.
[0084]FIG. 5 is a schematic view showing the entirety of an absolute position length measurement type encoder according to Embodiment 2, FIG. 6 is a flowchart showing actions from a space-dividing number conversion circuit to a position data synthesizing circuit, and FIG. 7 is a schematic view showing signals corresponding to respective steps of FIG. 6.
[0085]As shown in FIG. 5, the absolute position length measurement type encoder 101 has a configuration similar to the absolute position length measurement type encoder 100 as the entirety according to Embodiment 1. However, the encoder 101 differs from the encoder 100 in that the signal processing circuit 119 includes an edge position detection circuit 128, a peak position detection circuit 130, and a decoding circuit 132 in the front stage of a correlation circuit 134, and includes a position data synthesizin...
embodiment 3
[0107]In the above-described embodiments, it was configured that bright and dark patterns are imaged all in the X-axis direction of the ABS light-receiving element array 114 by a single lens 110. However, the present invention is not limited thereto. For example, shown in FIG. 8, it may be possible that a lens array in which a plurality of minor lenses 109A through 109E are juxtaposed in the lens 109 is used. In this case, since images 111 of bright and dark patterns are left-right reversed on the ABS light-receiving element array 115, it is necessary that the reading direction of image data is reversed to the moving direction for each of the minor array 115A through 115E of the ABS light-receiving element array 115. However, since the ABS pattern 104 and the ABS light-receiving element array 115 may be disposed in proximity to each other, the absolute position length measurement type encoder itself can be thinned, and can be made durable against disturbance.
[0108]Also, in the abov...
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