COORDINATE INPUT APPARATUS, LIGHT RECEIVING APPARATUS OF THE COORDINATE INPUT APPARATUS, AND MANUFACTURING METHOD OF THE SAME
First Claim
1. A coordinate input apparatus comprising:
- a reflection unit formed in a peripheral portion of a coordinate input effective region, and adapted to retroreflect incident light;
a light projection unit adapted to project light toward the coordinate input effective region; and
a light receiving unit formed at a corner of the coordinate input effective region,coordinate values of a pointed position being calculated based on a light amount distribution obtained by said light receiving unit,wherein said light receiving unit comprises at least;
a light receiving element;
a light receiving lens;
an adjusting unit adapted to adjust a positional relationship between said light receiving element and said light receiving lens; and
a light transmissive plate arranged between said light receiving element and said light receiving lens, and adapted to define a focal length of said light receiving lens, andsaid light transmissive plate is arranged between said light receiving element and said light receiving lens in a state in which an optical axis between said light receiving element and said light receiving lens is adjusted by said adjusting unit with said light transmissive plate being removed.
1 Assignment
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Accused Products
Abstract
A light receiving unit of a coordinate input apparatus includes a light receiving element, a light receiving lens, an adjusting unit for adjusting the positional relationship between the light receiving element and light receiving lens, and a light transmissive plate which is arranged between the light receiving element and light receiving lens, and defines the focal length of the light receiving lens. The light transmissive plate is arranged between the light receiving element and light receiving lens in a state in which the optical axis between the light receiving element and light receiving lens is adjusted by the adjusting unit with the light transmissive plate being removed.
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Citations
9 Claims
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1. A coordinate input apparatus comprising:
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a reflection unit formed in a peripheral portion of a coordinate input effective region, and adapted to retroreflect incident light; a light projection unit adapted to project light toward the coordinate input effective region; and a light receiving unit formed at a corner of the coordinate input effective region, coordinate values of a pointed position being calculated based on a light amount distribution obtained by said light receiving unit, wherein said light receiving unit comprises at least; a light receiving element; a light receiving lens; an adjusting unit adapted to adjust a positional relationship between said light receiving element and said light receiving lens; and a light transmissive plate arranged between said light receiving element and said light receiving lens, and adapted to define a focal length of said light receiving lens, and said light transmissive plate is arranged between said light receiving element and said light receiving lens in a state in which an optical axis between said light receiving element and said light receiving lens is adjusted by said adjusting unit with said light transmissive plate being removed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light receiving apparatus of an optical coordinate input apparatus, comprising:
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a light receiving element; a light receiving lens; an adjusting unit adapted to adjust a positional relationship between said light receiving element and said light receiving lens; and a light transmissive plate arranged between said light receiving element and said light receiving lens, and adapted to define a focal length of said light receiving lens, wherein said light transmissive plate is arranged between said light receiving element and said light receiving lens in a state in which an optical axis between said light receiving element and said light receiving lens is adjusted by said adjusting unit with said light transmissive plate being removed.
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8. A method of manufacturing a light receiving apparatus of an optical coordinate input apparatus, comprising:
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an adjustment step of adjusting an optical axis between a light receiving element and light receiving lens of the light receiving apparatus, as adjustment of a positional relationship between the light receiving element and the light receiving lens, such that a focus is adjusted to a distance shorter than a farthest point distance of a coordinate input effective region of the coordinate input apparatus from the light receiving apparatus within a viewing range of the light receiving apparatus; and an attaching step of attaching, between the light receiving element and the light receiving lens, a light transmissive plate having a thickness with which a focus of the light receiving apparatus is adjusted to the farthest point distance within the viewing range of the light receiving apparatus, after the adjustment step. - View Dependent Claims (9)
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Specification