Patent ID: 9470516
Filing Date: 2016-10-18
CPC Classification: G01B,G01N

Claim Text:
1. An unevenness detecting device detecting unevenness of a workpiece retained by workpiece holding means, the unevenness detecting device comprising: a pulsed illuminating light source emitting light having a predetermined wavelength range; a first converging lens converging the light emitted by the pulsed illuminating light source; a half-silvered mirror branching the light converged by the first converging lens; a chromatic aberration lens condensing the light branched by the half-silvered mirror and irradiating the workpiece retained by the workpiece holding means with the condensed light; a first condensing lens condensing return light reflected by the workpiece retained by the workpiece holding means and passed through the chromatic aberration lens and the half-silvered mirror; a mask disposed at a position of a focal point of the first condensing lens, the mask passing only the condensed return light; a second converging lens converging the return light passed through the mask; a diffraction grating performing light separation so as to correspond to wavelengths of the return light converged by the second converging lens; a second condensing lens condensing the return light resulting from the light separation by the diffraction grating; an imaging element disposed at a position of a focal point of the second condensing lens; control means including a memory storing an image generated by the imaging element; and output means displaying the image stored in the memory of the control means; wherein when a width direction of a detection region in which to detect the unevenness of the workpiece retained by the workpiece holding means is a Y-axis direction, and a longitudinal direction of the detection region is an X-axis direction, the mask has a slit extending in the Y-axis direction, and the imaging element generates a two-dimensional sectional shape in the Y-axis direction on a basis of the return light passed through the slit formed in the mask.