Flat-top reflection-based optical encoders

Details Flat-top reflection-based optical encoders Flat-top reflection-based optical encoders

2006-04-14

2009-02-24

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Optical

C341S011000

Reexamination Certificate

active

07495583

ABSTRACT:
A reflection-based optical encoding apparatus for the detection of position and/or motion of a mechanical device includes an encoding medium having at least a first reflective portion, and an encoder housing having a light-emitting source and a light-detecting sensor embedded within, the encoder housing being placed in proximity to the encoding medium such that a functional light path can be established from the light-emitting source to the light-detecting sensor via the first reflective portion of the encoding medium. The encoder housing includes a first flat facet positioned between the light-emitting source and the encoding medium, the first flat facet having a first angle relative to a common geometric plane such that light passing from the light-emitting source to the encoding medium is refracted along a first angled path in a manner that the refracted light strikes a desired location of the encoding medium.

REFERENCES:
patent: 5448358 (1995-09-01), Ishizuka et al.
patent: 6668645 (2003-12-01), Gilmour et al.
patent: 2003/0193016 (2003-10-01), Chin et al.
patent: 2006/0097051 (2006-05-01), Foo et al.

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