An optical code reading device comprises a light source and scanning head for projecting light for illuminating a code to be read, only one single mode optical fiber for transferring the light from the light source so that the spot size can be made as small as possible and shape of the light can be a...http://www.google.com/patents/US4847490?utm_source=gb-gplus-sharePatent US4847490 - Optical code reading device whose laser reading light is transmitted by only one single mode optical fiber
