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Ring illuminator
| Details |
Inventors: Shimokawa, Seiji; Nagahama, Tatsuya; Obata, Kuniaki; Matsubara, Hirotaka;
Assignee: Mitutoyo Corporation (Kawasaki, JP)
Primary Examiner: Sember; Thomas M.
Assistant Examiner: Truong; Bao Q
Attorney, Agent or Firm: Oliff & Berridge, PLC
A plurality of light emitting elements comprise a number of groups having light emitting colors different from each other. The light emitting element groups are arranged in ring shapes about an optical axis of an optical system in a plane or planes substantially orthogonal to the optical axis. A combining unit combines radiation light beams of different light emitting colors to generate illumination light having a given hue. The combining unit is provided downstream of the light emitting elements along a light emitting direction. A focusing unit focuses the illumination light in the direction toward the optical axis and is provided downstream of the combining unit. Accordingly, it is possible to direct illumination light having uniform and non-irregular hue, the hue corresponding to a surface color of an object to be measured, to the object to be measured. |
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DETAILED DESCRIPTION This invention provides a ring illuminator having a reduced size.
This invention separately provides a ring illuminator that can sufficiently enhance the accuracy of the image detection.
This invention separately provides a ring illuminator that enhances the illumination efficiency of the object to be measured.
In various exemplary embodiments, a ring illuminator according to this invention includes a light source having a plurality of light emitting elements.
The light emitting elements are arranged around an optical axis of an optical system.
The light emitting elements are formed of at least two groups of light emitting elements having light emitting colors that are different from each other.
In various exemplary embodiments, for each group of light emitting elements of the same type, those light emitting elements are arranged in a ring shape around the optical axis in a single plane, which, in various exemplary embodiments, is substantially orthogonal to the optical axis.
A combining unit is located downstream of the light emitting directions of the light emitting elements.
The combining unit combines radiation light beams, radiated from the light emitting elements, having light emitting colors different from each other.
The combining unit outputs combined illumination light having a given hue.
Further, a focusing unit is located downstream of an advancing direction of the combined illumination light.
The focusing unit focuses the combined illumination light at a given position along the optical axis.
In various exemplary embodiments, the ring shape of the light emitting elements around the optical axis includes a circular annular arrangement, a triangular annular arrangement, a quadratic annular arrangement, a polygonal annular arrangement including a pentagonal annular arrangement or any other appropriate closed curve arrangement about the optical axis.
Further, an elliptical annular arrangement or an oblong annular arrangement around the optical axis are also included in the ring shape
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