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US 6,617,572 B2Granted
Displacement information detection apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoh Ishizuka
Life of this patent
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AssigneeCanon Kabushiki Kaisha
InventorKoh Ishizuka
Estimating the term…
A displacement information detection apparatus includes a light generation unit, a first unit including a first grating for displacement information detection and one or more lens members for original detection, and a second unit including a second grating for displacement detection, which cooperates with the first grating, and an origin detection mark. The apparatus also includes at least one first light-receiving element for receiving light generated by the light generation unit and propagated via the first and second gratings, and outputting a signal including relative displacement information between the first and second units. The apparatus also includes one or more second light-receiving elements for receiving light generated by the light generation unit and propagated via the lens member. The second light-receiving elements output a signal indicating an origin based on a change in light-receiving state when the origin detection mark is present in the optical path of light leaving the lens member.
A scale apparatus, for a displacement information detection apparatus, provided with scale means for use in detecting relative displacement information between a relativity displaceable reading means and said scale means when said scale means is optically read by the reading means, said scale apparatus comprising:
A scale, for use in a displacement information detection apparatus including a slit member and detection means, comprising:
Dependencies are inferred from the claim text.