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US 2009/0213719 A1Published application
Optical encoding disc and optical encoder having same
AssigneeHon Hai Precision Industry Co., Ltd.
InventorJEN-TSORNG CHANG
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Abstract
An exemplary optical encoding disc includes a plurality of concentric annular tracks. Each track includes a plurality of coding units. Each coding unit includes a light converging portion and a light diverging portion. The light converging portions and the light diverging portions are arranged alternately along a circumferential direction of the optical encoding disc.
Claims20
An optical encoding disc comprising:
- a plurality of concentric annular tracks, each track comprising a plurality of coding units, each coding unit comprising a light converging portion and a light diverging portion, the light converging portions and the light diverging portions being arranged alternately along a circumferential direction of the optical encoding disc.
An optical encoder comprising:
- an optical encoding disc comprising a plurality of concentric annular tracks, each track comprising a plurality of coding units, each coding unit comprising a light converging portion and a light diverging portion, the light converging portions and the light diverging portions being arranged alternately along a circumferential direction of the optical encoding disc;
- a light source module configured for emitting a light beam towards the optical encoding disc;
- a motor coupled with the optical encoding disc and configured for driving the optical encoding disc to rotate;
- and
- an optical detection system comprising a plurality of photo-detectors arranged in a line parallel to a radius of the optical encoding disc, each photo-detector being corresponding to each track of the optical encoding disc respectively, each photo-detector being configured for receiving the light beam transmitted through the corresponding track, and generating a voltage according to an intensity of the received light beam.
2 more elements
An optical encoding disc comprising:
- a first annular track comprising a plurality of first coding units periodically arranged along a circumferential direction thereof, an angular period of the first encoding units being θT1, each first coding unit comprising a first light converging portion and a first light diverging portion, the light converging portions and the light diverging portions being arranged alternately along a circumferential direction of the optical encoding disc;
- and
- a second annular track, the first track and the second track being concentric, the second track comprising a plurality of second coding units periodically arranged along a circumferential direction thereof, an angular period of the second encoding units being θT2, wherein θT2=2*θT1, each second coding unit comprises a second light converging portion and a second light diverging portion, the light converging portions and the light diverging portions being arranged alternately along a circumferential direction of the optical encoding disc an interface between the first light converging portion and the first light diverging portion is aligned with a middle line of the second light converging portion or the second light diverging portion.
Dependencies are inferred from the claim text.