Displacement measuring apparatus and velocity measuring apparatus which measure displacement amount of moving object

摘要

A displacement measuring apparatus 100 which measures a displacement amount of a moving object 102 includes a light source that irradiates the moving object 102 using luminous flux emitted from a light emitting area 101, a photo diode array 104, 105 that includes a plurality of light receiving areas in a movement direction of the moving object 102 and that forms an image of the luminous flux reflected on a plurality of indentations 103 of the moving object 102 to receive light, and a measurement unit that measures the displacement amount of the moving object 102 based on a movement amount of a light emitting area image 106 that is formed on the photo diode array 104, 105 by forming the image of the luminous flux.

主权项

1. A displacement measuring apparatus for measuring a displacement amount of a moving object, the displacement measuring apparatus comprising:
a light source configured to irradiate the moving object using luminous flux emitted from a light emitting area; a light receiving element including a plurality of light receiving areas arranged in a movement direction of the moving object, the light receiving element being arranged such that luminous flux emitted from the light emitting area and reflected from one concave portion, of a plurality of concave portions in the moving object, is converged on a light receiving surface of the light receiving element by reflection from the one concave portion, the luminous flux emitted from the light source being reflected only once by the one concave portion and then entering the light receiving surface; and a measurement unit configured to measure the displacement amount of the moving object based on a movement amount of a light emitting area image that is formed on the light receiving element.