Kabushiki Kaisha Machida Seisakusho

Jiro Fuse

A projector system includes an optical converter element of a cylindrical shape, and a light beam-generating device for generating a plurality of light beams. Optical axes of the plurality of light beams are spaced from one another in a direction of the circumference of the optical converter element and intersecting one another substantially at one point lying on the axis of the optical converter element. The optical axes of the plurality of light beams are inclined at the same angle with respect to the axis of the optical converter element, so that when the plurality of light beams are incident on the optical converter element, an outgoing light beam is emitted from the optical converter element in such a manner that the outgoing light beam extends along an imaginary conical surface coaxial with the optical converter element. This outgoing light beam can be converted by a collimator lens into a light beam extending along an imaginary cylindrical surface. The light beam extending along the imaginary conical surface or the imaginary cylindrical surface is applied to an annular portion of an object to be detected, so that part of this light beam leaking through a flaw in the annular portion is detected by a photosensor.

Projector system and system for detecting flaw

A laser beam admitting device comprises a support structure for supporting an optical fiber having a core and a clad layer surrounding the core. Laser beam is admitted into a beam admitting end of the optical fiber through a condensing optical system. The support structure supports the optical fiber at a supporting location remote from the beam admitting end thereof. The support structure includes a tubular portion extending from the supporting location toward the beam admitting end of the optical fiber. The tubular portion has its inner diameter greater than an outer diameter of the clad layer of the optical fiber. A beam leakage material is disposed between the tubular portion and the clad layer, to allow the laser beam admitted into the clad layer to be diffused to the tubular portion.

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Kasukabe, Japan

Jiro Fuse