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US 8,279,450 B2Granted
Intra-oral measurement device and intra-oral measurement system
AssigneePanasonic Corporation
InventorsSadafumi Oota, Seiji Hamano, Fumio Sugata
Life of this patent
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Abstract
The present invention aims to provide an intra-oral measurement device and an intra-oral measurement system capable of measuring an inside of an oral cavity at high accuracy without increasing a size of the device, and includes a light projecting unit for irradiating a measuring object including at least a tooth within an oral cavity with light, a lens system unit for collecting light reflected by the measuring object, a focal position varying mechanism for changing a focal position of the light collected by the lens system unit, and an imaging unit for imaging light passed through the lens system unit.
Claims19
An intra-oral measurement device comprising:
- a light projecting unit for irradiating a measuring object including at least a tooth within an oral cavity with light;
- a lens system unit for collecting light reflected by the measuring object;
- a focal position varying mechanism for changing a focal position of the light collected by the lens system unit;
- an imaging unit for imaging light passed through the lens system unit;
- a pre-scan light projecting device for emitting guide light focused at a position distant from the light projecting unit by a distance set in advance;
- and
- an image processing unit, which without image the light passed through the lens system unit with the imaging unit when a circularity of the guide light emitted from the pre-scan light projecting device and projected onto the measuring object is lower than a threshold value set in advance, and images the light passed through the lens system unit with the imaging unit when the circularity of the guide light is higher than the threshold value set in advance.
4 more elements
An intra-oral measurement device comprising:
- a light projecting unit for irradiating a measuring object including at least a tooth within an oral cavity with light;
- a lens system unit for collecting light reflected by the measuring object;
- a focal position varying mechanism for changing a focal position of the light collected by the lens system unit;
- an imaging unit for imaging light passed through the lens system unit;
- a pre-scan light projecting device for emitting guide light focused at a position distant from the light projecting unit by a distance set in advance;
- and
- an image processing unit, which without image the light passed through the lens system unit with the imaging unit when an amount of shift between a light quantity distribution of the guide light emitted from the pre-scan light projecting device and projected onto the measuring object and an ideal light quantity distribution of the guide light is lower than a threshold value set in advance, and images the light passed through the lens system unit with the imaging unit when the amount of shift is higher than the threshold value set in advance.
4 more elements
An intra-oral measurement system comprising:
- a light projecting unit for irradiating a measuring object including at least a tooth within an oral cavity with light;
- a lens system unit for collecting light reflected by the measuring object;
- a focal position varying mechanism for changing a focal position of the light collected by the lens system unit;
- an imaging unit for imaging light passed through the lens system unit;
- a three-dimensional image converting unit for calculating three-dimensional coordinates of the measuring object using a plurality of images, having different focal positions, imaged by the imaging unit;
- a pre-scan light projecting device for emitting guide light focused at a position distant from the light projecting unit by a distance set in advance;
- and
- an image processing unit, which without image the light passed through the lens system unit with the imaging unit when a circularity of the guide light emitted from the pre-scan light projecting device and projected onto the measuring object is lower than a threshold value set in advance, and images the light passed through the lens system unit with the imaging unit when the circularity of the guide light is higher than the threshold value set in advance.
5 more elements
An intra-oral measurement system comprising:
- a light projecting unit for irradiating a measuring object including at least a tooth within an oral cavity with light;
- a lens system unit for collecting light reflected by the measuring object;
- a focal position varying mechanism for changing a focal position of the light collected by the lens system unit;
- an imaging unit for imaging light passed through the lens system unit;
- a three-dimensional image converting unit for calculating three-dimensional coordinates of the measuring object using a plurality of images, having different focal positions, imaged by the imaging unit;
- a pre-scan light projecting device for emitting guide light focused at a position distant from the light projecting unit by a distance set in advance;
- and
- an image processing unit, which without image the light passed through the lens system unit with the imaging unit when an amount of shift between a light quantity distribution of the guide light emitted from the pre-scan light projecting device and projected onto the measuring object and an ideal light quantity distribution of the guide light is lower than a threshold value set in advance, and images the light passed through the lens system unit with the imaging unit when the amount of shift is higher than the threshold value set in advance.
5 more elements
Dependencies are inferred from the claim text.