Patent ID: 7304723

Claim:
A multichannel photodetector, comprising at least a reaction container, a light source unit that emits a plurality of light beams with different wavelengths along a same optical path so as to allow the plurality of light beams to enter the reaction container, and a photoreceptive unit that receives light beams output from an inside of the reaction container, wherein the light source unit comprises at least a plurality of light emitting devices and a plurality of output dichroic mirrors that are different in wavelength range of a reflectible light beam and an actinometer for monitoring light amounts of the emitted light beams, the number of the plurality of output dichroic minors is equal to the number of the plurality of light emitting devices, the plurality of light emitting devices are arranged so that output directions of the respective light emitting devices are in parallel, the plurality of output dichroic mirrors are arranged so that each of the output dichroic minors reflects one of light beams emitted by the plurality of light emitting devices, and light beams reflected by the respective output dichroic mirrors pass through the same optical path in the same direction, the actinometer being disposed between the reaction container and the output dichroic mirror positioned nearest the reaction container, and the photoreceptive unit comprises at least a plurality of photoreceptors and a plurality of photoreceptive dichroic mirrors that are different in wavelength range of a reflectible light beam, the number of the plurality of photoreceptive dichroic mirrors is equal to the number of the plurality of photoreceptors, the plurality of photoreceptors are arranged so that photoreceptive surfaces of the respective photoreceptors are parallel to each other, and the plurality of photoreceptive dichroic mirrors are arranged so that each of the light beams output from the inside of the reaction container is reflected by any one of the photoreceptive dichroic mirrors and enters one of the plurality of photoreceptors, according to a wavelength of the light beam.