Pointing device comprising a light control part and electronic apparatus comprising an input device
AssigneeSharp Kabushiki Kaisha
InventorTakahiro Watanabe
Life of this patent
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Abstract
A pointing device including a touching surface, a light emitting diode, an imaging element, and a first light control part. A fingertip is placed on the touching surface. The light emitting diode illuminates the touching surface from a side opposite to a side where the fingertip is placed. The imaging element receives light reflected from the fingertip. The first light control part controls light, which is emitted from the light emitting diode and reaches the touching surface, so that the light is evenly incident to the touching surface. The pointing device improves detection accuracy and prevents malfunctions, even when there is deviation in an output from a light source. In addition, an electronic apparatus including an input device can be provided.
Claims8
A pointing device, comprising:
- a touching surface on which an object is placed;
- a light emitting element for illuminating the touching surface from a side opposite to a side where the object is placed;
- and
- an imaging element for receiving light reflected from the object, the pointing device further comprising a first light control part subduing a deviation in a distribution of a light intensity on the touching surface by controlling light which is emitted from the light emitting element and reaches the touching surface, and a second light control part absorbing light which does not contribute to illumination of the touching surface out of the light emitted from the light emitting element;
- the light emitting element emitting light whose light intensity is deviated with respect to a radiation angle, and
- the first light control part and the second light control part being positioned on a light path from the light emitting element to the touching surface, wherein the light emitting element is covered with a first resin section, the first light control part is provided on a first surface of the first resin section, and the first light control part diffuses light emitted from the light emitting element and is designed such that an interface on the light path has a bump structure, the bump structure having concavities and convexities repeated periodically which scatter light reaching the bump structure, and the second light control part is provided on a second surface of the first resin section.
An electronic apparatus comprising a pointing device as an input device,
- the pointing device comprising:
- a touching surface on which an object is placed;
- a light emitting element for illuminating the touching surface from a side opposite to a side where the object is placed;
- an imaging element for receiving light reflected from the object;
- and
- a first light control part subduing a deviation in a distribution of a light intensity on the touching surface by controlling light which is emitted from the light emitting element and reaches the touching surface, and a second light control part absorbing light which does not contribute to illumination of the touching surface out of the light emitted from the light emitting element;
- the light emitting element emitting light whose light intensity is deviated with respect to a radiation angle, and
- the first light control part and a second light control part being positioned on a light path from the light emitting element to the touching surface, wherein the light emitting element is covered with a first resin section, the first light control part is provided on a first surface of the first resin section, and the first light control part diffuses light emitted from the light emitting element and is designed such that an interface on the light path has a bump structure, the bump structure having concavities and convexities repeated periodically which scatter light reaching the bump structure, and the second light control part is provided on a second surface of the first resin section.
Dependencies are inferred from the claim text.