OPTICAL SENSOR, LIGHT DETECTING DEVICE, PAPER SHEET PROCESSING DEVICE, LIGHT DETECTING METHOD, AND PHOSPHORESCENCE DETECTING DEVICE
FIG12 is a cross-sectional view showing the structure of still another embodiment of an optical sensor according to the present invention
Further, in the optical sensor 10 to which the present invention is applied, the light guide 50 is not necessarily disposed in a position between the light source 30 and the photodetector 40 and the detection target T facing the optical sensor 10 as long as it can guide the excitation light from the light source 30 to the detection target T and can guide the radiation light from the detection target T to the photodetector 40. For example, as shown in FIG12, the light guide 50 may have an excitation light incident surface 51 and a radiation light emission surface 52 at the front and back, and a light incident/emission surface 53 at the lower side.
cross-sectional view
51
excitation light incident surface
30
light source
12
following Expression easily understood from Expressions
20
holder
40
photodetector photodetectors
52
radiation light emission surface
53
light incident/emission surface
10
optical sensor optical sensors
50
light guide
21
partition
70
optical filter optical filters
60
board
['6. The optical sensor according to any one of claims 1 to 5, further comprising an optical filter between the light source and the light guide unit and/or between the  photodetector and the light guide unit.', '7. The optical sensor according to any one of claims 1 to 6, wherein the light source and the photodetector are disposed on a same board.']