Patent ID: 9528924
Filing Date: 2016-12-27
CPC Classification: G01N

Claim Text:
1. A photodetection device comprising: a light-transmitting transparent stage on which a detection object is placed; an excitation optical system that irradiates the detection object with excitation light emitted from a light source in a direction perpendicular to the transparent stage; a detection optical system that detects light emitted from a detection surface of the detection object placed on the transparent stage by irradiation with the excitation light; a data sampling circuit included in the detection optical system to sample an intensity of the detected light at a predetermined set interval; and an optical module that includes the light source, the excitation optical system, and the detection optical system and that two-dimensionally and relatively scans the transparent stage in a first sampling direction of the data sampling circuit and a second sampling direction intersecting the first sampling direction, wherein a scan length in the first sampling direction in the optical module is longer than a scan length in the second sampling direction, the data sampling circuit performs the sampling at a first sampling interval when the optical module performs scanning in the first sampling direction, and performs the sampling at a second sampling interval different from the first sampling interval when the optical module performs scanning in the second sampling direction, the excitation optical system includes an aperture that defines a spot shape of the excitation light to irradiate the detection object, a distance of the first sampling interval is shorter than a distance of the second sampling interval, and a spot size of the excitation light in the first sampling direction is smaller than a spot size in the second sampling direction.