Position detecting device, liquid ejecting apparatus and...

Details Position detecting device, liquid ejecting apparatus and... Position detecting device, liquid ejecting apparatus and...

2006-09-26

2010-06-08

Huffman, Julian D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S019000

Reexamination Certificate

active

07731330

ABSTRACT:
A position detecting device for detecting a position of an object, includes a light emitting portion that emits light, a light receiving portion that receives the light from the light emitting portion, and a scale that is arranged between the light emitting portion and the light receiving portion, and includes a position detecting pattern and a smear detecting pattern. The position detecting pattern has a first light transmitting portion for transmitting the light from the light emitting portion and a first light interception portion for intercepting the light from the light emitting portion which are alternately arranged in a detection range of the object. The smear detecting pattern for detecting smear of the scale has a second light transmitting portion for transmitting the light from the light emitting portion and a second light interception portion for intercepting the light from the light emitting portion which are alternately arranged.

REFERENCES:
patent: 5302944 (1994-04-01), Curtis
patent: 5563591 (1996-10-01), Jacobs et al.
patent: 2004-202963 (2004-07-01), None
patent: 2005-081691 (2005-03-01), None

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