PURPOSE: To provide a device, which has high resolution, can be used for a sample having the large area and can read the large amount of data quickly, by providing the assembly of photodetectors, and individually receiving the fluorescence generated from an emitting part of each electronic beam.

CONSTITUTION: When an original picture 6 is brought into a part beneath a light source 7, transparent circles are aligned in the lateral direction. The visible laser from the light source 7 advances along the straight line. The images of the transparent circles are projected on a photoelectric surface 9. Four photoelectron beams corresponding to the transparent circles are emitted from the photoelectric surface 9. The amounts of the electron beams become the amounts of electrons, which are about 10 times, in dynodes 10, 14 and 15. The electron beams enter into an electron lens 16 and refracted. The focal points are focused in a sample 23. The beams are transmitted through the sample 23 and absorbed into the transparent electrode at the surface of a film 22. Since the sample 23 is formed by fluorescent dyeing, visible fluorescence is generated by the hit of the electron beam. The light is expanded with the optical lens of a photodetector group 24 having a microscope. The image is projected on a photodetector group at the lower end. The information of each focal point is recorded into the memory device of a computer through an individual channel.