A facsimile transmitter includes a lamp for directing a light beam toward a scanner which reflects the light onto a document to be reproduced, picks up the light reflected from the document and directs such light to a photomultiplier operable to send to a reproducing recorder as electrical signal proportional to the intensity of the light and the shade value of the document. The lamp is accurately pre-located and pre-mounted in a permanent holder which is detachably secured to a lamp housing and which, as an incident to attachment to the housing, automatically locates the lamp in a precisely established position to produce light of maximum intensity, the pre-mounted lamp being located in such position by the holder regardless of dimensional irregularities in the lamp. To focus the light beam on the document accurately and to direct the reflected light along an exact path toward the photomultiplier, the scanner is formed as two initially adjustable telescopic units carrying relatively simple plane mirrors adapted to be adjusted into precisely established positions by sliding and rotating the units and thereafter held permanently in such positions by bonding the units rigidly together.
CROSS-REFERENCE TO A RELATED APPLICATION
This application is a division of our copending application Ser. No. 726,408, filed May 3, 1968 now U.S. Pat. No. 3,555,266.
A simplified scanner for facsimile transmission. A cylindrical member supports the material to be scanned and a tubular member extends concentrically into the cylinder. A laser beam passes through the tubular member and is focused to a spot on the inner surface of the cylinder. Either the tubular member or the cylinder is caused to rotate about, and translate along, their common axis with the aid of air bearings. In this manner, spiral scanning is effected with only one moving member. The foregoing abstract is not to be taken either as a complete exposition or as a limitation of the present invention. In order to understand the full nature and extent of the technical disclosure of this application, reference must be had to the following detailed description and the accompanying drawings as well as to the claims.
