Browse Prior Art Database

OPTO-MECHANICAL LIGHT BAR SPATIAL FREQUENCY

IP.com Disclosure Number: IPCOM000026071D
Original Publication Date: 1990-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 77K

Publishing Venue

Xerox Disclosure Journal

Abstract

The spatial resolution of conventional light bars; i.e., liquid crystal shutter arrays or light emitting diode (LED) arrays, is fixed during the manufacturing process. The cost and complexity of these devices increases with increasing spatial resolution. A scanning configuration which enables an imaging resolution virtually independent of the light bar spatial resolution is shown in Figure 1. An image bar 8 has a stationary horizontal slit 10 which is in parallel with the light axis of bar 8 and a moving diagonal slit 12 superimposed over slit 10. A moving spot of light is generated from left to right as the diagonal slit 12 moves from top to bottom. The spot size is determined by the overlapping slit areas 14. Referring to Figure 2, elements 10 and 12 are repeated in register with pixels 18 of a light bar such that a series of flying spots are generated when the diagonal slits 12 are in motion. The motion required to generate the moving spot can be provided by a rotating endless loop (i.e., cylinder, flexible belt, etc.) moving at a constant velocity or by an oscillating member. When oscillatory motion is used to generate the moving spot, the shape of the diagonal slit can be adjusted such that the spot scans at a constant velocity; i,e, during acceleration or deceleration.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 84% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

OPTO-MECHANICAL LIGHT BAR Proposed Classification SPATIAL FREQUENCY U.S. C1.355/67
Lloyd F. Bean
Int. Carl D. Washington C1. G03b 27/54

FIG. I

10 10 12

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 1 January/February 1990 39

[This page contains 1 picture or other non-text object]

Page 2 of 2

OPTO-MECHANICAL LIGHT BAR SPATIAL FREQUENCY(Cont'd)

The spatial resolution of conventional light bars; i.e., liquid crystal shutter arrays or light emitting diode (LED) arrays, is fixed during the manufacturing process. The cost and complexity of these devices increases with increasing spatial resolution. A scanning configuration which enables an imaging resolution virtually independent of the light bar spatial resolution is shown in Figure 1. An image bar 8 has a stationary horizontal slit 10 which is in parallel with the light axis of bar 8 and a moving diagonal slit 12 superimposed over slit 10. A moving spot of light is generated from left to right as the diagonal slit 12 moves from top to bottom. The spot size is determined by the overlapping slit areas 14. Referring to Figure 2, elements 10 and 12 are repeated in register with pixels 18 of a light bar such that a series of flying spots are generated when the diagonal slits 12 are in motion. The motion required to generate the moving spot can be provided by a rotating endless loop (i.e., cylinder, flexible belt, etc.) moving at a constant velocity or by an oscillating member. When oscillatory mo...