Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-09-28
2008-07-22
Epps, Georgia Y. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S23700G, C347S020000, C347S023000, C347S037000
Reexamination Certificate
active
07402828
ABSTRACT:
A liquid ejecting head is operable to eject liquid toward a target medium. A light emitter is operable to emit light. A light receiver is adapted to receive the light emitted from the light emitter, and operable to output a signal in accordance with an amount of the received light, thereby detecting a position of the liquid ejecting head. A transparent member is elongated in a first direction and disposed between the light emitter and the light receiver. A line pattern is provided with the transparent member so as to oppose the light emitter, and including light transmitting sections and light shielding sections which are alternately arranged in the first direction with a first pitch. Each of the light transmitting sections is adapted to allow the light emitted from the light emitter to pass through. Each of the light shielding sections is adapted to shield the light emitted from the light emitter. A width of each of the light transmitting sections in the first direction varies relative to a second direction perpendicular to the first direction. The light receiver includes a substrate elongated in the first direction. A plurality of light receiving elements are arrayed on the substrate in the first direction such that positions of adjacent light receiving elements relative to the second direction are made different in accordance with the width of each of the light transmitting sections.
REFERENCES:
patent: 2004/0238725 (2004-12-01), Ornellas et al.
patent: 2000241198 (2000-09-01), None
patent: 2004-202963 (2004-07-01), None
patent: 2005-81691 (2005-03-01), None
Igarashi Hitoshi
Nakata Satoshi
Edwards Angell Palmer & & Dodge LLP
Epps Georgia Y.
Legasse Jr. Francis M
Penny, Jr. John J.
Seiko Epson Corporation
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