Abstract: This invention relates to a optical fiber type colorimeter, and in particularly it refers to a colorimeter which uses optical fibers to transmit light to sample or reference matter. Scattered light reflected from matter surface is received by a optical fiber and then transmitted to a grating which splits light into spectrum. An A/D converter is connected to the driver circuit to communicated signal to computer for analysis of chromatic value, and determination of chrominace of sample, especially for analysis of some solid, products like textile, paper or brick. Since optical fibers are used in this invention, it enables more flexible installation of this invention. Moreover, precision of measurement is no longer affected by testing environment. The fabrication cost is lowered without the use of conventional reflective mirror.

Abstract: It is a lens comprising three elements for a scanning device; the lens is particularly for providing a linear scanning. A beam enters the lens from its front focus by rotating a constant angular velocity, will become a beam in parallel with the axis of the lens and moving at a contant speed when passing through the lens; the distance H between the beam and the axis of the lens, the contained angle .theta. between the incident beam and the axis of the lens have the relation of H=KF.theta., in which F is the focal length of the lens, and K is a constant.