ABSTRACT
Laser Printer ....................................................................................................... 448
System Configuration and Units ............................................................. 451
The Laser Optical Elements.............................................................. 452
Photoconductor................................................................................... 452
Toner Charging Development System............................................ 452
Hot Roll Fuser ..................................................................................... 454
Black Density Control System.......................................................... 455
Printing Performance Specification......................................................... 455
Laser Source ........................................................................................ 456
Acousto-Optical Deflector................................................................. 457
The Optical System.................................................................................... 458
System Configuration ........................................................................ 458
Resolution of Optical Devices.................................................................. 459
Line Scanner: Polygon Mirror .......................................................... 459
Feedback Control of Beam Focus ............................................................ 463
Aperture Control ................................................................................ 465
Optical Storage Disk.......................................................................................... 469
System Configuration................................................................................ 470
Optical System for Focusing .................................................................... 472
Beam Tracking ............................................................................................ 477
Disk Servo Control System....................................................................... 478
Atomic Force Microscope ................................................................................. 484
Measurement Principle ............................................................................. 484
Cantilever Deflection ......................................................................... 493
Optical Measurement of Cantilever Deflection .................................... 496
Optics for Tip Deflection Measurement ......................................... 497
Control of the Scanning Motion .............................................................. 501
Confocal Scanning Microscope........................................................................ 510
Measurement Principle ............................................................................. 510
Beam Scanning ........................................................................................... 513
Nipkow Disk............................................................................................... 518
System Resolution...................................................................................... 520
Focus Measure and Control ..................................................................... 521
Projection Television.......................................................................................... 524
Digital Micromirror Device ...................................................................... 525
Architecture of a DMD Cell.............................................................. 526
Light Pulse Width Modulation ........................................................ 532
Grating Light Valve Display .................................................................... 535
Light Diffraction by Deformable Grating Modulator................... 536
Deflection Control of Microbeam Structures ................................. 538
Visual Tracking System..................................................................................... 540
Image Processing ....................................................................................... 541
Feature Extraction ...................................................................................... 544
Visual Tracking of a Moving Object ....................................................... 548
Zoom Lens Control ............................................................................ 549
Problems.............................................................................................................. 558
References ........................................................................................................... 563
In the previous chapter, we derived a variety of functional components that
are characteristics of optomechatronic nature. These components can be
identified as a fundamental common tool that can realize optomechatronic
integration and in actual practice are becoming the essential parts of many
optomechatronic systems. In fact, this emerging trend can be observed in
a number of engineering products and systems. In this chapter, we will
illustrate several optomechatronic systems in which the optomechatronic
components are playing essential roles in performing key functional tasks.
The systems to be dealt with here include laser printers, optical storage
disks, atomic force microscopes (AFM), confocal microscopes, digital micro-
mirror devices, and visual tracking systems.
