| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable observing a recorded three-dimentional image in a wider scope. SOLUTION: In a method by means of which laser beams are made to cross in the intetior of a work made of a transparent material, dot-shaped trace TC is formed by temperature rise at the cross point CP, and then a three- dimentional image FT is recorded. In this case, a work WK1 is supported so as to be shiftable in the direction along a projecting direction of a first laser beam 21a and along a projecting direction of a second laser beam 22a respectively, and further so as to be rotatable around a center axis AX which is a shaft in parallel with the direction of injecting direction of the second laser beam 22a and passing through the center of the work WK, and then by shifting or turning the work WK1, the location of the cross point CP in the work WK is decided, the trace TC is formed, and the trace TC is distributed.</p> |
