Patent ID: 11473901

Abstract:
The purpose of the present invention is to provide a height measurement device with which, even when the height of a sample surface varies considerably, it is possible, with a relatively simple configuration, to perform height measurement with high accuracy at various heights. In order to achieve the abovementioned purpose, proposed is an optical height measurement device characterized by being provided with: a stage for retaining a sample; a stage driving unit for adjusting the stage at different heights; a projection optical system for projecting light onto the sample; a detection optical system for receiving light reflected from the sample; and a processing unit for measuring the height of the sample on the basis of a signal outputted from the detection optical system, wherein the projection optical system is provided with a light source that emits light, and an optical path dividing element for branching the optical path of the light emitted from the light source, and the detection optical system is provided with a sensor for receiving light reflected from the sample, and an element for adjusting the light path of the light reflected from the sample in the direction of the sensor prior to reception of the light by the sensor.