SPATIALLY LIGHT SEPARATING PHOTOMETER

摘要

PURPOSE:To make it possible to supply equal light beams to two photometric optical systems through different courses without using a semitransparent mirror by irradiating light to be measured to two adjacent faces of a rotary polygon mirror and reflecting equal beams in two direction. CONSTITUTION:Noticing that an inclined angle formed by two adjacent faces of the rotary polygon mirror 20 having N faces in 3604o/N and an angle (light guiding angle) formed by two reflected light beams of incident light made incident from the same direction on the two adjacent faces in 720 deg./N, equal spatially separated scanning light beams are simultaneously led into two optical systems. A light beam 15 radiated from a light emitting point is made incident upon an incident slit 41 at first in accordance with the rotation 26 of the rotary polygon mirror 20, and finally a light beam 16 radiated from a light emitting point 12 is made incident upon an incident slit 41 along a circular arc 19 passing the center of a light emitting source. Light is similarly made incident also to an incident slit 46. Consequently, the quantity of light to be used can be increased twice without increasing the size of the rotary polygon mirror 20 and a semi-transparent mirror or a light dividing means which may generate the loss of light can be omitted because equal light can be supplied to the two photometric means through different courses.