SCANNER DEVICE AND DEVICE FOR MEASURING THREE-DIMENSIONAL SHAPE OF OBJECT
First Claim
1. A scanner apparatus that scans an object (M) with a line pattern (U) of light and imports surface information of the object (M), comprising:
- an illumination unit (100, 110) that projects the line pattern (U) of light onto the object (M);
a pattern scanning mechanism (200) that changes a projection position of the line pattern (U) on the object (M) with time; and
an imaging unit (300, 301 to 303) that captures an image of the object (M) onto which the line pattern (U) is projected from a predetermined direction, and imports surface information of the object (M), whereinthe illumination unit (100, 110) includesa coherent light source (50) that generates a coherent light beam (L50),a hologram recording medium (45, 46, 85) on which an image (35) of a scatter body (30) having a shape corresponding to the line pattern (U) is recorded, anda light beam scanning device (60, 65) that irradiates the light beam (L60, L65) onto the hologram recording medium (45, 46, 85) and scans the light beam so that an irradiation position of the light beam (L60, L65) on the hologram recording medium (45, 46, 85) changes with time, whereinan image of the scatter body (30) is recorded as a hologram on the hologram recording medium (45, 46, 85) by using reference light (L23, Lref) irradiated along an optical path,the coherent light source (50) generates a light beam (L50) with a wavelength capable of reproducing the image (35) of the scatter body,the light beam scanning device (60, 65) scans the light beam (L60, L65) so that an irradiation direction of the light beam (L60, L65) onto the hologram recording medium (45, 46, 85) is along the optical path of the reference light (L23, Lref), andthe line pattern (U) is projected by reproduction light of a hologram obtained from the hologram recording medium (45, 46, 85).
1 Assignment
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Accused Products
Abstract
A laser beam is reflected by a light beam scanning device and irradiated onto a hologram recording medium. On the hologram recording medium, an image of a linear scatter body is recorded as a hologram by using reference light that converges on a scanning origin. The light beam scanning device bends the laser beam at the scanning origin and irradiates the laser beam onto the hologram recording medium. At this time, by changing a bending mode of the laser beam with time, an irradiation position of the bent laser beam on the hologram recording medium is changed with time. Diffracted light from the hologram recording medium produces a reproduction image of the linear scatter body on a light receiving surface of the stage. When an object is placed on the light receiving surface, a line pattern is projected by hologram reproduction light, so that the projected image is captured and a three-dimensional shape of the object is measured.
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Citations
26 Claims
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1. A scanner apparatus that scans an object (M) with a line pattern (U) of light and imports surface information of the object (M), comprising:
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an illumination unit (100, 110) that projects the line pattern (U) of light onto the object (M); a pattern scanning mechanism (200) that changes a projection position of the line pattern (U) on the object (M) with time; and an imaging unit (300, 301 to 303) that captures an image of the object (M) onto which the line pattern (U) is projected from a predetermined direction, and imports surface information of the object (M), wherein the illumination unit (100, 110) includes a coherent light source (50) that generates a coherent light beam (L50), a hologram recording medium (45, 46, 85) on which an image (35) of a scatter body (30) having a shape corresponding to the line pattern (U) is recorded, and a light beam scanning device (60, 65) that irradiates the light beam (L60, L65) onto the hologram recording medium (45, 46, 85) and scans the light beam so that an irradiation position of the light beam (L60, L65) on the hologram recording medium (45, 46, 85) changes with time, wherein an image of the scatter body (30) is recorded as a hologram on the hologram recording medium (45, 46, 85) by using reference light (L23, Lref) irradiated along an optical path, the coherent light source (50) generates a light beam (L50) with a wavelength capable of reproducing the image (35) of the scatter body, the light beam scanning device (60, 65) scans the light beam (L60, L65) so that an irradiation direction of the light beam (L60, L65) onto the hologram recording medium (45, 46, 85) is along the optical path of the reference light (L23, Lref), and the line pattern (U) is projected by reproduction light of a hologram obtained from the hologram recording medium (45, 46, 85). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An object surface information acquisition method for importing surface information of an object (M) by projecting a line pattern (U) of light onto the object (M), comprising:
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a preparation step of creating a hologram recording medium (45, 46, 85) by recording an image (35) of a scatter body (30) for forming a line pattern (U) as a hologram on a recording medium (40, 80); a projection step of irradiating a coherent light beam (L60) onto the hologram recording medium (45, 46, 85) in a state where the object (M) is disposed at a position to be irradiated with reproduction light of a hologram obtained from the hologram recording medium (45, 46, 85) and scanning the light beam (L60) on the hologram recording medium (45, 46, 85) so that an irradiation position changes with time, and projecting the line pattern (U) onto the object (M); and an imaging step of capturing an image of the object (M) onto which the line pattern (U) is projected from a predetermined direction, and importing surface information of the object (M), wherein in the preparation step, coherent illumination light (L12) is irradiated onto the scatter body (30) so that scattered light (L30) obtained from the scatter body (30) is used as object light, coherent light (L23, Lref) with the same wavelength as that of the illumination light (L12) is irradiated onto the recording medium (40, 80) along an optical path so as to be used as reference light, and interference fringes formed by the object light and the reference light are recorded on the recording medium (40, 80) to prepare the hologram recording medium (45, 46, 85), and in the projection step, a light beam (L60, L65) with a wavelength capable of reproducing the image (35) of the scatter body is scanned so as to advance toward an irradiation position on the hologram recording medium (45, 46, 85) by passing through an optical path along the optical path of the reference light (L23, Lref).
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14. A scanner apparatus that scans an object (M) with a line pattern (U) of light and imports surface information of the object (M), comprising:
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an illumination unit (120) that projects the line pattern (U) of light onto the object (M); a pattern scanning mechanism (200) that changes a projection position of the line pattern (U) on the object (M) with time; and an imaging unit (300, 301 to 303) that captures an image of the object (M) onto which the line pattern (U) is projected from a predetermined direction, and imports surface information of the object (M), wherein the illumination unit (120) includes a coherent light source (50) that generates a coherent light beam (L50), a microlens array (48) including a collection of a large number of independent lenses, and a light beam scanning device (60) that irradiates the light beam (L50) onto the microlens array (48) and scans the light beam so that an irradiation position of the light beam (L60) on the microlens array (48) changes with time, wherein each of the independent lenses included in the microlens array (48) has a function of refracting light irradiated from the light beam scanning device (60) and forming a linear irradiation region (I) on a nearby surface (R) near the object (M), and is configured so that all irradiation regions (I) formed by the independent lenses become substantially the same common region on the nearby surface (R).
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15. A scanner apparatus that scans an object (M) with a line pattern (U) of light and imports surface information of the object (M), comprising:
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an illumination unit (100, 110, 120) that projects the line pattern (U) of light onto the object (M); a pattern scanning mechanism (200) that changes a projection position of the line pattern (U) on the object (M) with time; and an imaging unit (300, 301 to 303) that captures an image of the object (M) onto which the line pattern (U) is projected from a predetermined direction, and imports surface information of the object (M), wherein the illumination unit (100, 110, 120) includes a coherent light source (50) that generates a coherent light beam (L50), a light beam scanning device (60, 65) that carries out beam scanning by controlling either or both of a direction and a position of the light beam (L50), and an optical diffusing element (45, 46, 48) that diffuses and emits an incident light beam, the light beam scanning device (60, 65) emits the light beam (L50) generated by the coherent light source (50) toward the optical diffusing element (45, 46, 48), and scans the light beam so that an incidence position of the light beam (L60) on the light diffusing element (45, 46, 48) changes with time, and the optical diffusing element (45, 46, 48) has a function of forming a linear irradiation region (I) on a nearby surface (R) near the object (M) by diffusing an incident light beam, and is configured so that formed irradiation regions (I) become substantially the same common region on the nearby surface (R) regardless of the incidence position of the light beam.
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16. An apparatus for measuring a three-dimensional shape of an object (M), comprising:
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an illumination unit (100, 110) that projects a line pattern (U) of light onto the object (M); an imaging unit (300, 301 to 303) that captures an image of the object (M) onto which the line pattern (U) is projected from a predetermined direction; and a shape analysis unit (400) that creates three-dimensional shape data (T) of the object (M) by analyzing the line pattern (U) on the image (G) captured with the imaging unit (300, 301 to 303), wherein the illumination unit (100, 110) includes a coherent light source (50) that generates a coherent light beam (L50), a hologram recording medium (45, 46, 85) on which an image (35) of a scatter body (30) having a shape corresponding to the line pattern (U) is recorded, and a light beam scanning device (60, 65) that irradiates the light beam (L60, L65) onto the hologram recording medium (45, 46, 85) and scans the light beam so that an irradiation position of the light beam (L60, L65) on the hologram recording medium (45, 46, 85) changes with time, wherein an image of the scatter body (30) is recorded as a hologram on the hologram recording medium (45, 46, 85) by using reference light (L23, Lref) irradiated along an optical path, the coherent light source (50) generates a light beam (L50) with a wavelength capable of reproducing the image (35) of the scatter body, the light beam scanning device (60, 65) scans the light beam (L60, L65) so that an irradiation direction of the light beam (L60, L65) onto the hologram recording medium (45, 46, 85) is along the optical path of the reference light (L23, Lref), and the line pattern (U) is projected by reproduction light of a hologram obtained from the hologram recording medium (45, 46, 85). - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification