Patent ID: 11919114
Assignee: DISCO CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A measuring apparatus for measuring positional relation between a chuck table for holding a workpiece thereon and a processing tool for cutting or grinding the workpiece held on the chuck table, the measuring apparatus comprising:
a broadband light source;
a mirror for reflecting light emitted from the broadband light source to travel toward a surface of the processing tool facing the workpiece;
a chromatic aberration condensing lens disposed between the broadband light source and the mirror or between the mirror and the processing tool;
a light branching unit branching reflected light from the surface of the processing tool facing the workpiece that has been reflected by the mirror and traveled back through the chromatic aberration condensing lens; and
a position detecting unit detecting an intensity of the reflected light that corresponds to a wavelength of the reflected light branched by the light branching unit;
wherein a position of the processing tool is detected based on the intensity of the reflected light.