Browse Prior Art Database

BOILING ACTIVATED IMAGE BAR

IP.com Disclosure Number: IPCOM000025899D
Original Publication Date: 1988-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 153K

Publishing Venue

Xerox Disclosure Journal

Abstract

In Figure 1, an end view of a linear array of light shutters or valves for use as a print bar 10 in conjunction with a xerographic engine is shown. It utilizes the formation of a vapor film created by boiling a transparent liquid above an electrically heated resistive area to redirect a light beam by the means of total internal reflection. In the absence of boiling the light is transmitted with high efficiency. This is a modification of the Thermally Activated Image Bar disclosed in U.S.

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 55% of the total text.

Page 1 of 4

XEROX DISCLOSURE JOURNAL

BOILING ACTIVATED IMAGE BAR
Nancy B. Goodman
Robert W. Anderson

Proposed Classification

U.S. C1.3461160 Int. C1. Gold 15/14

NG. 1

'0'

Volume 13 Number 6 November/December 1988 297

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

Page 2 of 4

BOILING ACTIVATED IMAGE BAR (Cont'd)

34

16.20 mil THICK

ADHESIVE

36 34

l2 v

FIG. 2

  - Smils AT EQTTOM

TROUGH- 8 mils AT TOP.

FIG. 3

     XEROX DISCLOSURE JOURNAL Volume 13 Number 6 NovembedDecember 1988

298

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

Page 3 of 4

BOILING ACTIVATED IMAGE BAR (Cont'd)

In Figure 1, an end view of a linear array of light shutters or valves for use as a print bar 10 in conjunction with a xerographic engine is shown. It utilizes the formation of a vapor film created by boiling a transparent liquid above an electrically heated resistive area to redirect a light beam by the means of total internal reflection. In the absence of boiling the light is transmitted with high efficiency. This is a modification of the Thermally Activated Image Bar disclosed in U.S. Patent No. 4,701,772.

The print bar 10 comprises two transparent prisms 12 and 14 sandwiching a transparent liquid 16 which has an index of refraction matched to that of the prisms. The liquid 16 is contained between the prisms by a continuous seal 18 which also acts as a spacer to maintain a uniform thickness of the liquid. An array of thin film heaters 20 are deposited on the confronting surface 15 of prism 14. Addressing electrodes on surface 15 have been omitted. These electrodes permit the selective pulsing of individual heaters by current pulses having the magnitude and duration sufficient to cause a temporary vapor film to be formed on the heaters. Light from a suitable light source is formed into sheets of light 22 and focused on the surface of the heaters by a lens system not shown.

The mode shown in Figure 1 utilizes the top surface of the vapor film 24, instead of the interface with the heater, to form the reflective surface. A photoreceptor (not shown) is placed in osition "D". In the absence of boiling,

shown by dashed arrow 26. This mode relies on the fact that upon heating the fluid, one obtains sheet boiling over the heater region rather than a single hemispherical bubble. At threshold, these bubbles coalesce into a flat sheet of vapor and the li ht is directed toward position "C", shown by arrow 28, by

In another mode, the photoreceptor is placed at position "C", so that, in the presence of boiling, the light is to...