EP0654356A2 - Dispositif émettant par la tranche à grande portée - Google Patents

Dispositif émettant par la tranche à grande portée Download PDF

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Publication number
EP0654356A2
EP0654356A2 EP94308636A EP94308636A EP0654356A2 EP 0654356 A2 EP0654356 A2 EP 0654356A2 EP 94308636 A EP94308636 A EP 94308636A EP 94308636 A EP94308636 A EP 94308636A EP 0654356 A2 EP0654356 A2 EP 0654356A2
Authority
EP
European Patent Office
Prior art keywords
edge emitter
assembly
light
emitter assemblies
edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94308636A
Other languages
German (de)
English (en)
Other versions
EP0654356A3 (fr
Inventor
Norman Joseph Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0654356A2 publication Critical patent/EP0654356A2/fr
Publication of EP0654356A3 publication Critical patent/EP0654356A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays

Definitions

  • This invention relates generally to a high resolution light source formed from a thin film electroluminescent edge emitter assembly and, more particularly, to a wide track edge emitter assembly adapted for greater than standard width applications.
  • an electroluminescent device generally, and particularly a thin film electroluminescent edge emitting device, may be utilized to provide an electronically controlled, high resolution light source.
  • a thin film electroluminescent edge emitting device may be utilized to provide an electronically controlled, high resolution light source.
  • This patent discloses a thin film electroluminescent line array emitter structure which includes a first dielectric layer disposed on a common electrode, a second dielectric layer spaced from the first dielectric layer, a phosphor layer interposed between the first and second dielectric layers and an excitation or top electrode disposed on the second dielectric layer. At least one of the electrodes, for example, the excitation or top electrode, is segmented to form a plurality of individual control electrodes. The plurality of individual control electrodes in combination with the remaining structure define a plurality of individual light-emitting pixels.
  • Japanese Laid-Open Patent Application KoKi Number 63-91998 discloses an EL luminescent edge emitter array in which the upper side of metallic electrode wraps around the reflecting end surface of the luminescent layer. Each of the EL elements in the array is surrounded by an insulating film whose refractive index is lower than that of the EL layer. The array further includes a discharge prevention area between the bottom electrode and the reflecting end of the top metallic electrode.
  • United States Patent No. 4,951,064 discloses a thin film electroluminescent edge emitter assembly which includes a packaging assembly surrounding at least a portion of the edge emitter structure to enclose the linear array of light-emitting pixels in a contaminant-free environment.
  • the wall of the packaging assembly adjacent to the array of pixels is made from a translucent material which permits light energy emitted by selected pixels of the array interior to the packaging assembly to pass through the wall of the packaging assembly.
  • a series of edge emitter assemblies are provided within the same packaging to permit wide track printing.
  • adjacent edge emitter end portions overlap.
  • the translucent material light emitting edges of adjacent edge emitters are offset. As a result, the focal point of the adjacent edge emitter assemblies do not converge on the photoreceptor. Thus, the emitter assembly does not provide a continuous line.
  • edge emitter assembly adapted to provide wide track printing wherein the edge emitter assembly provides a composite, continuous light source for a light-receiving surface.
  • a thin film electroluminescent, composite light source assembly for directing light onto a light-receiving surface or photoreceptor is provided.
  • An elongated rod means is positioned above the light-receiving surface.
  • the rod means preferably has two angled bottom surfaces which are provided axially on the rod means.
  • a plurality of edge emitter assemblies are axially arranged on the rod means.
  • Each of the edge emitter assemblies includes a thin film electroluminescent edge emitter structure disposed on a layer of substrate material.
  • Each edge emitter structure has a configuration to define a linear array of spaced-apart light-emitting pixels.
  • Each of the pixels includes a first surface disposed on the layer of substrate material associated therewith. A second surface spaced apart from the first surface, and a light-emitting edge surface extending between the first and second surfaces.
  • the plurality of edge emitter assemblies is oriented relative to each other on the rod means so that each assembly is positioned on the opposite bottom surface as that of its adjacent assemblies.
  • the light emitting edge surfaces of the pixels of each of the edge emitter assemblies are focused on the same line of the light receiving surface.
  • Each end portion of one of the edge emitter assemblies overlaps an end portion of one of its adjacent assemblies. This arrangement enables the light-emitting pixels of the plurality of edge emitter assemblies to form a composite array of light-emitting pixels of a desired overall length.
  • Lens means can be provided on the rod means immediately in the path of the light from each edge emitter assembly to the light-receiving surface.
  • the lens means is adapted to focus and direct the light from the edge emitter assembly to the desired line on the light-receiving surface.
  • Figure 1 is a schematic end view of a first presently preferred embodiment of the wide track edge emitter assembly of the present invention.
  • Figure 2 is a schematic bottom view of the wide track edge emitter assembly of Figure 1.
  • Figure 3 is a schematic end view of a second presently preferred embodiment of the wide track edge emitter assembly of the present invention.
  • Figure 4 is a schematic end view of a third presently preferred embodiment of the wide track edge emitter assembly of the present invention.
  • the wide track edge emitter assembly design of the present invention includes two or more edge emitters mounted to a central rod to expose a page greater than 8.5 inches wide to the assembly.
  • a standard edge emitter requires approximately 10 inches of space to expose 8.5 inches. Accordingly, when two or more edge emitters are used, the units must join or overlap the active part of each other and print in coincidence but without overlap to avoid double exposure. Two or more sections of a line being exposed may be aligned physically at the focal point on the photoreceptor or photo-sensitive paper. In an alternate mounting method, the emitters may be physically offset, with electronics controlling time delays between information arrivals at the various segments of the assembly.
  • Figure 1 is a cross section of wide track edge emitter assembly 10.
  • Assembly 10 includes a central rod 12, preferably having a generally triangular cross section.
  • Rod 12 includes base 14 by which assembly 10 can be secured above a light-receiving surface 16.
  • Rod 12 also includes angled sides 18 and 20 upon which a plurality of edge emitter assemblies 22 are provided.
  • a lens 24 may also be provided on each of sides 18 and 20 below each edge emitter assembly 22.
  • the light emitted by edge emitter assembly 22 and focused by lens 24 is directed to a single focal point 26 provided on light-receiving surface 16.
  • Assembly 10 is positioned at an appropriate height above light-receiving surface 16 so that the focal point 26 for the light emitted by the assemblies 22 on both sides 18 and 20 is at the same point.
  • Edge emitter assemblies 22 provided on sides 18 and 20 are axially offset from one another as shown in Figure 2. This alternating and overlapping arrangement is known in the art as stitching. By being axially offset on opposing sides 18 and 20, edge emitter assemblies 22 provide a continuous, composite array of light-emitting pixels of a desired overall length. Electrical interconnetion of the edge emitter assemblies 22 enables the continuous printing of a line on light receiving surface 16.
  • rod 12 is provided with grooves 28 on each of sides 18 and 20. Grooves 28 cooperate with lips 30 provided in each edge emitter assembly 22 to provide axial adjustment of edge emitter 22 along the length of rod 12.
  • each edge emitter assembly 22 can be precisely located relative to its adjacent assemblies 22.
  • edge emitter assemblies 22 are also adapted to be adjustable transverse to the longitudinal axis of rod 12.
  • Figures 3 and 4 show alternative embodiments for wide track edge emitter assembly 10.
  • the stitching arrangement of edge emitter assemblies 22 shown in Figure 2 is applied.
  • the wide track edge emitter assembly 32 of Figure 3 and wide track assembly 34 of Figure 4 merely provide different arrangements for the rod 12.
  • Wide track assembly 32 of Figure 3 is narrower in cross-section but deeper in height than wide track assembly 10.
  • Wide track assembly 34 of Figure 4 is wider in cross-section but shorter in height than wide track assembly 10.
  • the particular arrangement of rod 12 chosen for wide track edge emitter assembly 10 is merely a function of the space available for the wide track assembly 10.
  • the angle of sides 18 and 20 of rod 12 is selected so that the focal points of the edge emitting light on either side of the rod converge on light receiving surface 16 along the line to be printed.
  • One advantage of the wide track edge emitter assembly 10 of the present invention is the ease with which electrical connections can be made in the assembly.
  • a single conduit provided in rod 12 can be used to connect each of the edge emitter assemblies 22 to one another.
  • This electrical connection can be easily arranged because the electrical connection for each edge emitter assembly 22 are made on the upper end of the assembly. Such electrical connection is strongly desirable to enable a continuous and sequential printing of a line by the combination of edge emitter assemblies 22.
  • the protective coating provided on the edge emitter surface prevents the convergence of the focal points on the same line on the photoreceptor.
  • electrical connections are much more difficult in the face-to-face assembly because electrical connections cannot be made in the buss bar because the connectors are on opposing sides of the bar.
  • Each of lenses 24 provided on rod 12 are hard fastened to the rod 12. All the lenses are cofocused.
  • Each edge emitter assembly 22 can be adjusted up or down along its respective side 18 or 20 so that it has a proper focal point 26 on light receiving surface 16.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electroluminescent Light Sources (AREA)
  • Facsimile Heads (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
EP94308636A 1993-11-24 1994-11-23 Dispositif émettant par la tranche à grande portée Withdrawn EP0654356A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15775693A 1993-11-24 1993-11-24
US157756 1993-11-24

Publications (2)

Publication Number Publication Date
EP0654356A2 true EP0654356A2 (fr) 1995-05-24
EP0654356A3 EP0654356A3 (fr) 1998-01-07

Family

ID=22565133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94308636A Withdrawn EP0654356A3 (fr) 1993-11-24 1994-11-23 Dispositif émettant par la tranche à grande portée

Country Status (2)

Country Link
EP (1) EP0654356A3 (fr)
JP (1) JPH07232453A (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318597A (en) * 1979-08-21 1982-03-09 Oki Electric Industry Co., Ltd. Optical print head for optical printing devices
JPS61205154A (ja) * 1985-03-08 1986-09-11 Oki Electric Ind Co Ltd 光プリントヘツドの発光素子モジユ−ル整列方法
JPS63112172A (ja) * 1986-10-31 1988-05-17 Nec Corp Ｌｅｄアレイヘツド
US4875057A (en) * 1988-09-01 1989-10-17 Eastman Kodak Company Modular optical printhead for hard copy printers
US4899184A (en) * 1989-04-24 1990-02-06 Westinghouse Electric Corp. Multiplexed thin film electroluminescent edge emitter structure and electronic drive system therefrom
EP0428088A2 (fr) * 1989-11-13 1991-05-22 Alcatel SEL Aktiengesellschaft Imprimante électro-optique
JPH05100555A (ja) * 1991-10-11 1993-04-23 Matsushita Electric Ind Co Ltd 光ヘツド

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318597A (en) * 1979-08-21 1982-03-09 Oki Electric Industry Co., Ltd. Optical print head for optical printing devices
JPS61205154A (ja) * 1985-03-08 1986-09-11 Oki Electric Ind Co Ltd 光プリントヘツドの発光素子モジユ−ル整列方法
JPS63112172A (ja) * 1986-10-31 1988-05-17 Nec Corp Ｌｅｄアレイヘツド
US4875057A (en) * 1988-09-01 1989-10-17 Eastman Kodak Company Modular optical printhead for hard copy printers
US4899184A (en) * 1989-04-24 1990-02-06 Westinghouse Electric Corp. Multiplexed thin film electroluminescent edge emitter structure and electronic drive system therefrom
EP0428088A2 (fr) * 1989-11-13 1991-05-22 Alcatel SEL Aktiengesellschaft Imprimante électro-optique
JPH05100555A (ja) * 1991-10-11 1993-04-23 Matsushita Electric Ind Co Ltd 光ヘツド

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 039 (M-559), 5 February 1987 & JP 61 205154 A (OKI ELECTRIC IND CO LTD), 11 September 1986, *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 356 (M-745), 26 September 1988 & JP 63 112172 A (NEC CORP), 17 May 1988, *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 451 (P-1595), 18 August 1993 & JP 05 100555 A (MATSUSHITA ELECTRIC IND CO LTD), 23 April 1993, *

Also Published As

Publication number Publication date
EP0654356A3 (fr) 1998-01-07
JPH07232453A (ja) 1995-09-05

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