Coordinate input apparatus
First Claim
1. A coordinate input apparatus which detects a pointed position to an effective coordinate input region, comprising:
- a light projecting unit constructed to project light to the effective coordinate input region;
a reflection unit constructed to retroreflect the light projected by said light projecting unit;
a light receiving unit constructed to receive light from one of said light projecting unit and said reflection unit;
a moving unit constructed to move a set of said light projecting unit, said light receiving unit, and said reflection unit in order to change a light amount received by said light receiving unit;
a determination unit constructed to determine whether the light amount received by said light receiving unit is appropriate for calculating the pointed position in the effective coordinate input region; and
a notification unit constructed to notify a determination result of said determination unit.
1 Assignment
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Accused Products
Abstract
A coordinate input apparatus includes a light projecting unit configured to project light parallelly to an effective coordinate input region, a reflection unit configured to retroreflect the light projected by the light projecting unit, and a light receiving unit configured to receive light from the light projecting unit or the reflection unit. The coordinate input apparatus includes a moving unit configured to move a set of the light projecting unit, light receiving unit, and reflection unit in a direction perpendicular to the effective coordinate input region in order to ensure a light amount with which a pointed position in the effective coordinate input region can be calculated based on variations of a light amount distribution obtained from the light receiving unit.
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Citations
19 Claims
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1. A coordinate input apparatus which detects a pointed position to an effective coordinate input region, comprising:
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a light projecting unit constructed to project light to the effective coordinate input region; a reflection unit constructed to retroreflect the light projected by said light projecting unit; a light receiving unit constructed to receive light from one of said light projecting unit and said reflection unit; a moving unit constructed to move a set of said light projecting unit, said light receiving unit, and said reflection unit in order to change a light amount received by said light receiving unit; a determination unit constructed to determine whether the light amount received by said light receiving unit is appropriate for calculating the pointed position in the effective coordinate input region; and a notification unit constructed to notify a determination result of said determination unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus which detects a pointed position to an effective coordinate input region, comprising:
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a first housing constructed to incorporate at least two first sensor units each comprising a first light receiving unit and a first light projecting unit constructed to project light to the effective coordinate input region; a second housing constructed to incorporate at least two second sensor units each comprising a second light receiving unit and a second light projecting unit constructed to project light to the effective coordinate input region; at least two first moving units constructed to move said at least two first sensor units in order to change a light amount received by said first light receiving unit of each of said at least two first sensor units; at least two second moving units constructed to move said at least two second sensor units in order to change a light amount received by said second light receiving unit of each of said at least two second sensor units; a determination unit constructed to determine whether the light amounts received by said first and second light receiving units are appropriate for calculating the pointed position in the effective coordinate input region; and a notification unit constructed to notify a determination result of said determination unit, wherein said first housing and said second housing are arranged on two facing sides of a rectangular region forming the effective coordinate input region, said first housing comprises a first reflection unit constructed to retroreflect light projected by said second light projecting unit of the second sensor units, said second housing comprises a second reflection unit constructed to retroreflect light projected by said first light projecting units of the first sensor unit, said first light receiving unit receives light from one of said second light projecting unit and said second reflection unit, and said second light receiving unit receives light from one of said first light projecting unit and said first reflection unit. - View Dependent Claims (15, 16)
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17. An assembly used with another assembly in an apparatus which detects a pointed position to an effective coordinate input region, wherein said assembly and said another assembly are arranged on two facing sides of a rectangular region forming the effective coordinate input region, the assembly comprising:
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at least two sensor units each comprising a light receiving unit and a light projecting unit constructed to project light to the effective coordinate input region; a reflection unit constructed to retroreflect light projected by at least two other sensor units of said another assembly; at least two moving units constructed to move said at least two sensor units in order to change a light amount received by said light receiving unit of each of said at least two sensor units; a determination unit constructed to determine whether the light amount received by said light receiving unit is appropriate for calculating the pointed position in the effective coordinate input region; and a notification unit constructed to notify a determination result of said determination unit, and wherein said light receiving unit receives light projected by said at least two other sensor units of said another assembly and light retroreflected by another reflection unit of said another assembly. - View Dependent Claims (18, 19)
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Specification