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1. US5895915 - Bi-directional scanning system with a pixel clock system

Office
United States of America
Application Number 08899805
Application Date 24.07.1997
Publication Number 5895915
Publication Date 20.04.1999
Grant Number 5895915
Grant Date 20.04.1999
Publication Kind A
IPC
H01J 3/14
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
3Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
14Arrangements for focusing or reflecting ray or beam
G01N 21/64
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
63optically excited
64Fluorescence; Phosphorescence
G02B 21/00
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
21Microscopes
G02B 26/10
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
26Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating or modulating
08for controlling the direction of light
10Scanning systems
G06T 1/00
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
1General purpose image data processing
H04N 1/113
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
04Scanning arrangements
113using oscillating or rotating mirrors
CPC
G02B 26/10
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
26Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating
08for controlling the direction of light
10Scanning systems
Applicants General Scanning, Inc.
Inventors DeWeerd Herman
Stokes Brian
Bengtsson Hans
Honkanen Peter
Agents Cesari and McKenna, LLP
Title
(EN) Bi-directional scanning system with a pixel clock system
Abstract
(EN)

A bi-directional optical scanning system includes a spring-stiffened, taut-band mechanical subsystem that translates rotational motion of a servo-controlled actuator to translational (scan line or "fast axis") motion of a sample relative to a stationary objective lens. A first taut steel band attaches to a first end of a shuttle that moves the sample over the fast axis. The band then wraps partially in one direction around a light-weight wheel that is rotated by the servo-controlled actuator. The second end of the band attaches to a pre-loaded spring that is, in turn, attached to the wheel. A second taut steel band wraps partially around the wheel in the opposite direction, with one end of the band attached to the wheel and the other end attached to a second end of the shuttle. When the wheel rotates in one direction, the first band pulls the shuttle, and thus, the sample, in the forward scan direction. When the wheel rotates in the opposite direction, the second band pulls the shuttle and the sample in the backward scan direction. As the wheel rotates, the first band fits into a slit in the second band where the two bands would otherwise overlap. Each band thus remains tightly wrapped around the wheel. The wrap angle associated with the overlay of the first band on the wheel is carefully chosen to ensure that the band does not slip relative to the wheel in response to forces associated with the acceleration of the sample or differences in thermal expansion of the wheel and the band. There is thus a known relationship between the rotational movement of the wheel and the translational movement of the sample even under varying environmental conditions.