Laser Scanning Notebook

“…Even if the focal guide is shaped to conform to this aspheric surface, the spot velocity remains not perfectly uniform. Achievement of both a circular arc and uniform spot velocity is provided only by a scanner operating in radial symmetry 4,9,13,14 This is accomplished for this "wideband recording' task with a rotating pyramidal polygon operating 'tilted axis", as illustrated in Fig. 9; a 1966 design for which the circular locus theorem" was originally developed.…”

Section: Ill Progress In Historical Perspectivementioning

confidence: 99%

Key notes to the advancement of optical scanning (Keynote Paper)

Beiser¹

2005

SPIE Proceedings

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In forming an historical perspective of the development of optical scanning, we ask a probing question: What was the first major optical scanning innovation? We offer one having unexpected attributes, and seek audience ideas. We then demonstrate the pioneering work in Optical Scanning for information transfer --some created long before we arrived on the scene. Our job has been and is --Make it Faster and Better.The body of the presentation addresses how our technology advanced to this useful state. We then view some key signs of this progress Major device development starts with the mirrored reflectors, articulated in oscillation or in rotation. The High Inertia catagory concldues with holographic scanning. The Low Inertia groups, initiated with the Oscillatory scanners, continue into the Acoustooptic and the very fast Electrooptic domains. The quest for economic practicality gains special attention for the control of scanned beam misplacement, leading to precise opto-mechanical pixel and line positioning from cost-effective articulating scanning devices. The development concludes by describing some recent advancing technogies which utilize novel disciplines for precise low inertia random-access scanning.Some of the early progress was derived from work conducted by research groups which limited information distribution. Such constraint resulted from, e.g, security requirements, or specialized operational fields of interest, or simply from lack of interaction. Consequently, with limited early information transfer, other groups having related expertise or interest were delayed in the pursuit of this development. Commendation is accorded to the SPIE for recognizing early in the '70s (our First Conference entitled, Laser Recording, Vol. 53) the need for effective information transfer, by supporting and sustaining the forums for this technology for more than three decades.

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“…Whence, DNaX/e. (1) The prismatic polygon having n facets parallel to the axis (each displaced in angle by 2Tr/n), partially illuminated by an input beam (residing in a plane normal to the axis), reflects an output beam (in the same plane as the input beam) scanned through the full useful angle ê2 (2rrIn) 4r1Ti/n (2) in which ii is the duty cycle and n is the number of facets. The first 2 represents the optical doubling of the mechanical scan angle.…”

Section: Development Of Design Equationsmentioning

confidence: 99%

“…The diffraction-limited scanned resolution (1,4,7) is expressed as NeD/ax, in which N is the total number of accessible elements of resolution, E is the full optical scan angle, D is the illuminated aperture width (in direction of scan), a is the aperture shape factor (1,7) and X is the wavelength. Whence, DNaX/e.…”

Section: Development Of Design Equationsmentioning

confidence: 99%

<title>Design equations for a polygon laser scanner</title>

Beiser¹

1991

SPIE Proceedings

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The characteristics of a rotating polygon scanner in relation to its flat field lens are expressed as a function of relatively fixed system parameters. They include the desired resolution, number of facets,scan duty cycle, and desired pupil relief distance (to the flat field lens or to the first physical obstruction in the optical path). Account is taken of beam enlargement on the facet due to non-normal landing, and of provision to avoid excessive beam truncation at the ends of scan. Also, the location of the polygon with respect to the optical axis is determined from system parameters. Equations are provided which govern the polygon dimensions and its relationship to associated components, and application procedure is summarized.

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Laser Scanning Notebook

Cited by 6 publications

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<title>180 Mega-Pixel Per Second Optical Image Recording</title>

<title>180 Mega-Pixel Per Second Optical Image Recording</title>

Key notes to the advancement of optical scanning (Keynote Paper)

<title>Design equations for a polygon laser scanner</title>

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