Optical unit for detecting object and coordinate input apparatus using same
First Claim
1. An object detecting optical unit for detecting a direction or a position of an object, which is placed on a detecting plane surface and irradiated by light, by detecting the existence or non-existence of a retroreflective light reflected by a retroreflective member, said optical unit comprising:
- a light projection means having a plurality of light sources and a plurality of lenses which correspond to said light sources, wherein said plurality of light sources and said plurality of lenses are arranged in such a manner as to form a fan shaped projection pattern which is substantially parallel to said detecting plane surface, said projection pattern being as if projected from a virtual one point light source; and
a light receiving means having a slit, or a lens and a linear photoreceptive group, wherein said slit or lens and said linear photoreceptive group are arranged in such a manner as to form a light receiving pattern with a view field corresponding to said fan shaped projection pattern formed by said light projection means.
8 Assignments
0 Petitions
Accused Products
Abstract
An object detecting optical unit for detecting a direction or a position of an object placed on a detecting plane surface is disclosed. The optical unit detects existence or non existence of a retroreflective light reflected by a retroreflective member. A light projection device is formed by a plurality of light sources and corresponding lenses, arranged in to form a fan shaped projection pattern parallel to the detecting plane surface, the projection pattern being as if projected from a virtual one point light source. A light receiving device is included which has a slit or lens and linear photoreceptive group, arranged in such a manner as to form a light receiving pattern with a view field corresponding to the fan shaped projection pattern. A position coordinate input apparatus using the optical unit is also disclosed.
-
Citations
10 Claims
-
1. An object detecting optical unit for detecting a direction or a position of an object, which is placed on a detecting plane surface and irradiated by light, by detecting the existence or non-existence of a retroreflective light reflected by a retroreflective member, said optical unit comprising:
-
a light projection means having a plurality of light sources and a plurality of lenses which correspond to said light sources, wherein said plurality of light sources and said plurality of lenses are arranged in such a manner as to form a fan shaped projection pattern which is substantially parallel to said detecting plane surface, said projection pattern being as if projected from a virtual one point light source; and
a light receiving means having a slit, or a lens and a linear photoreceptive group, wherein said slit or lens and said linear photoreceptive group are arranged in such a manner as to form a light receiving pattern with a view field corresponding to said fan shaped projection pattern formed by said light projection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A position coordinate input apparatus having at lease two sets object detecting optical units provided respectively at predetermined positions, each of said optical units conducting a calculation for the direction of an object placed on a detecting plant surface, thereby calculating the coordinates of said object using the triangulation principle, and then inputting the attained position coordinate information into an information processing device, each of said optical units comprising:
-
a light projection means having a plurality of light sources and a plurality of lenses which correspond to said light sources, wherein said plurality of light sources and said plurality of lenses are arranged in such a manner as to form a fan shaped projection pattern which is substantially parallel to said detecting plane surface, said projection pattern being as if projected from a virtual one point light source; and
a light receiving means having a slit, or a lens and a linear photoreceptive group, wherein said slit or lens and said linear photoreceptive group are arranged in such a manner as to form a light receiving pattern with a view field corresponding to said fan shaped projection pattern formed by said light projection means. - View Dependent Claims (10)
-
Specification