Patent ID: 11879717
Assignee: DISCO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A measuring apparatus comprising:
a holding unit for holding a measurand on a holding surface of a rotatable chuck table; and
a measuring unit for measuring a height of an upper surface of the measurand held by the holding unit or a thickness of the measurand held by the holding unit, wherein the measuring unit includes:
a light source for emitting light in a predetermined wavelength band,
a first optical fiber for transmitting the light emitted from the light source,
a branching member for branching the light transmitted by the first optical fiber to at least two measuring optical fibers,
a head unit having a plurality of heads including respective beam condensers for converging the light branched by the branching member onto the measurand,
a shutter device for shifting timings of application of the light from the heads to the measurand, wherein the shutter device includes a shutter associated with each of the heads, positioned between the associated head and the holding surface of the holding unit when in a closed position,
a second optical fiber branched from the branching member, for transmitting returning light reflected from the measurand and transmitted through the measuring optical fibers,
a spectroscopic unit having a light detector for detecting the returning light transmitted through the second optical fiber, and
a controller for controlling operation of the shutter device to control the timings of application of the light from the heads to the measurand, while the chuck table is being rotated, and for controlling the light detector to detect the returning light from the heads individually.