Optical position detection device, hand device, and display device with position detection function
View Patent ↗A position detection device includes: a light source adapted to form a light intensity distribution of a detection light beam; a first detector adapted to receive a reflected light beam of the detection light beam reflected by an object in a detection area where the light intensity distribution is formed; a transmissive member disposed between the detection area and the light source, and between the detection area and the first detector, and having a first surface directed toward the detection area and a second surface directed toward the light source; a second detector adapted to receive a light beam reflected by the second surface out of the detection light beam; a position detector adapted to detect the object based on the detection result in the first detector; and a light blocking member disposed between the second detector and the detection area, and adapted to block the reflected light beam.
1. A position detection device adapted to detect a position of a target object, comprising:
a light source section forming a light intensity distribution of a detection light beam;
a first light detector receiving a reflected light beam of the detection light beam reflected by the target object;
a transmissive member disposed between a detection area and the light source section, and between the detection area and the first light detector;
a second light detector receiving a light beam reflected by the transmissive member out of the detection light beam emitted from the light source section; and
a light blocking member disposed between the second light detector and the transmissive member, and adapted to block the reflected light beam.
2. The position detection device according to claim 1 , wherein
the second light detector is disposed at a position overlapping the first light detector in a plan view with respect to a flat surface of the transmissive member.
3. The position detection device according to claim 1 , wherein
the light source section forms a first light intensity distribution in which the intensity varies in a direction from a first side toward a second side opposite to the first side in the detection area, and a second light intensity distribution having an intensity variation in a direction from the second side toward the first side that is different from the first light intensity distribution, and
the position detection device detects a position of the target object based on a comparison result between a detection result in the first light detector when forming the first light intensity distribution, and a detection result in the first light detector when forming the second light intensity distribution.
4. The position detection device according to claim 1 , wherein
the light source section forms a first light intensity distribution in which the intensity varies in a direction from a first side toward a second side opposite to the first side in the detection area, and a second light intensity distribution having an intensity variation in a direction from the second side toward the first side that is different from the first light intensity distribution, and varies an emission intensity of the detection light beam so that the detection result in the first light detector when forming the first light intensity distribution and the detection result in the first light detector when forming the second light intensity distribution become equal to each other, and
the position detection device detects a position of the target object based on one of the emission intensity of the detection light beam after varying the emission intensity of the detection light beam and the detection result in the second light detector.
5. The position detection device according to claim 3 , wherein environment light enters the first light detector and the second light detector.
6. A hand device provided with a position detection device adapted to detect a position of a target object, comprising:
a light source section forming a light intensity distribution of a detection light beam;
a first light detector receiving a reflected light beam of the detection light beam reflected by the target object;
a transmissive member disposed between a detection area and the light source section, and between the detection area and the first light detector;
a second light detector receiving a light beam reflected by the transmissive member out of the detection light beam emitted from the light source section;
a light blocking member disposed between the second light detector and the transmissive member, and adapted to block the reflected light beam; and
a hand adapted to grip the target object.
7. A display device with a position detection function adapted to detect a position of a target object, comprising:
a light source section forming a light intensity distribution of a detection light beam;
a first light detector receiving a reflected light beam of the detection light beam reflected by the target object;
a transmissive member disposed between the detection area and the light source section, and between a detection area and the first light detector;
a second light detector receiving a light beam reflected by the transmissive member out of the detection light beam emitted from the light source section;
a light blocking member disposed between the second light detector and the transmissive member, and adapted to block the reflected light beam; and
an image generation device adapted to display an image.