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US 4,788,422 AGranted
High resolution rotary encoder having appositely rotating disks
AssigneeSharp Kabushiki Kaisha
InventorToshiaki Fujiwara
Life of this patent
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Abstract
A rotary encoder having first and second slit disks are disposed between a light emitting diode and a light sensor coaxially in proximity to each other, the two slit disks each having a large number of slits formed radially at equal intervals in a peripheral edge portion of the disks, the first slit disk being connected to and rotated by a rotational shaft, and the second slit disk being rotated by interlocking gears in a direction opposite to that of the first disk.
Claims7
A rotary encoder which comprises:
- a first disk having a first plurality of slits formed at equal intervals in the peripheral edge thereof;
- a second disk disposed adjacent to and coaxial with said first disk, wherein said second disk has a second plurality of slits formed at equal intervals in the peripheral edge thereof and aligned corresponding to said first plurality of slits, said first and second disks having first and second outer faces;
- a light emitting source disposed at said first outer face;
- and
- a light sensor disposed at said second outer face for sensing light emitted from said light emitting source through said first and second pluralities of slits;
- wherein said first and second disks rotate in opposite directions .
3 more elements
Dependencies are inferred from the claim text.