Sanwal P. Sarraf

Evaluation And Specification Of Micro-Machined Optics For Laser Printing

The quality of optical surfaces generated by single-point diamond machining has been evaluated for laser printing applications. Microfinish topography of the surfaces has been analyzed by differential bidirectional laser scattering. Random and periodic surface structure, derived from the Fourier transform of the scattered-light power spectrum, are compared with interferometric surface roughness measurement. Surface tolerance may be specified for a class of laser printers by comparing the scattered intensity distribution with the analytical model of image degradation due to optical scattering. Roughness parameters have also been characterized as a function of tool radius and feed rate. Surface flatness and relative surface parameters are measured for a polygonal laser deflector. Measurement techniques are described. The characteristics of some commercially supplied micro-machined optics are discussed.

Air Spindle For Laser Scanner

The design and analysis of a novel motor and bearing assembly for a polygonal laser scanner are discussed. Static and dynamic characteristics of this assembly are investigated. A detailed analysis of bearing stiffness and load capacity at various rotational speeds is presented. The analysis also treats the dependence of magnitude and phase angle of the bearing reaction on the frequency of motion. The criterion for a relative transverse and angular oscillatory motion stability of the bearing surface is discussed. The analysis is compared with experimental results from a prototype.