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WO2004068188A2 - Systeme d'imagerie par modulation a zone reflechissante - Google Patents

Systeme d'imagerie par modulation a zone reflechissante Download PDF

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Publication number
WO2004068188A2
WO2004068188A2 PCT/US2004/002174 US2004002174W WO2004068188A2 WO 2004068188 A2 WO2004068188 A2 WO 2004068188A2 US 2004002174 W US2004002174 W US 2004002174W WO 2004068188 A2 WO2004068188 A2 WO 2004068188A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
reflective area
modulator
retrofit kit
beam splitter
Prior art date
Application number
PCT/US2004/002174
Other languages
English (en)
Other versions
WO2004068188A3 (fr
Inventor
Jae Eun Yu
Jinyong Wu
Original Assignee
Umi Group Incorporated
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 Umi Group Incorporated filed Critical Umi Group Incorporated
Publication of WO2004068188A2 publication Critical patent/WO2004068188A2/fr
Publication of WO2004068188A3 publication Critical patent/WO2004068188A3/fr

Links

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
    • B41J2/465—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 masks, e.g. light-switching masks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/1013—Beam splitting or combining systems for splitting or combining different wavelengths for colour or multispectral image sensors, e.g. splitting an image into monochromatic image components on respective sensors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining

Definitions

  • This invention relates generally to an apparatus and method for spatially and temporally modulating a light beam and imaging modulated light onto a photosensitive media.
  • Prior art digital printing systems either use laser or light emitting diode (LED) light sources, which are very complicated and expensive. These systems cannot be easily retrofitted into existing mini-lab or photosensitive media printing systems.
  • Existing technology uses liquid crystal modulator which does not have sufficiently high fill factor and thus requires interpolation. Current systems do not have straightforward light uniformization systems resulting in inefficient and expensive systems.
  • Photographic images are traditionally printed onto photographic paper using conventional film based optical printers.
  • the photographic industry is converting to digital imaging.
  • One step in the digital imaging process is to utilize images obtained from digital cameras or scanned film exposed in traditional ER559320034US 079-01 photographic cameras to create digital image files that are then printed onto photographic paper.
  • the current invention relates to the area of digital image printing of digital image files onto photographic paper.
  • a more contemporary approach uses a single spatial light modulator such as a Texas mstruments digital micromirror device (DMD) as shown in U.S. Pat. No. 5,061,049 or liquid crystal device (LCD) modulator to modulate an incoming optical beam.
  • DMD Texas mstruments digital micromirror device
  • LCD liquid crystal device
  • the second approach is to use a liquid crystal spatial light modulator.
  • Liquid crystal modulators are a low cost solution for applications involving spatial light modulators.
  • Several photographic printers using commonly available LCD technology have been proposed. Some examples of such systems are described in U.S. Pat. Nos. 5,652,661; 5,701,185; and 5,745,156.
  • Most designs revolve around the use of a transmissive spatial light modulator such as depicted in U.S. Pat. Nos. 5,652,661 and 5,701,185.
  • most spatial light modulators have been designed for use in transmission. While such a method offers several advantages in ease of optical design for printing, there are several drawbacks to the use of conventional transmissive LCD technology.
  • Transmissive spatial light modulators generally have reduced aperture ratios and the use of (thin film transistor) TFT on glass technology does not promote the pixel-to-pixel uniformity desired in many printing applications. Furthermore, in order to ER559320034US 079-01 provide large numbers of pixels, many high resolution transmissive LCDs possess footprints of several inches. Such a large footprint can be unwieldy when combined with a print lens. As a result, most LCD printers using transmissive technology are constrained to either low resolution or small print sizes. To print high resolution 8 in. by 10 in. images with at least 300 pixels per inch requires 2400 by 3000 pixels. Transmissive spatial light modulators with such resolutions are not readily available. Most of the activity in spatial light modulators has been directed at projection display.
  • the projectors are optimized to provide maximum luminous flux to the screen with secondary emphasis placed on contrast, resolution and uniformity.
  • Another drawback for transmissive LCD systems is that the image formed on the photosensitive material does not appear continuous because the aperture ratio is low.
  • spatial dithering may compensate for some of the low aperture ratio, spatial dithering involves the use of complicated and expensive mechanic equipment and the introduction of line artifacts.
  • An object of the present invention is to overcome the above-mentioned drawbacks of digital image printing on photographic paper, namely cost and resolution,
  • High resolution reflective LCDs with high contrast (greater than 100:1) such as described in U.S. Pat. Nos. 5,325,137 and 5,805,274 has opened possibilities for printing that were previously unavailable.
  • the inventive printer is based on a reflective LCD spatial light modulator illuminated sequentially, and where the LCD spatial light modulator may be sub-apertured and dithered in two directions, and possibly three to increase the resolution.
  • This method has been applied to transmissive LCD systems due to the already less than perfect fill factor. Incorporating dithering into a reflective LCD printing system would allow high- resolution printing while maintaining a small footprint. Also, because of the naturally high fill factor present in many reflective LCD technologies, the dithering can be omitted with no detriment to the continuity of the printed image.
  • the use of a single LCD serves to significantly reduce the cost of the printing system.
  • the use of an area spatial light modulator sets the exposure times at sufficient length to avoid or significantly reduce reciprocity failure.
  • a reflective LCD designed for projection display can be incorporated into the printing design with little or no modification to the reflective LCD itself.
  • a method of exposing an area of photosensitive media using at least one reflective area modulator comprises the steps of collecting light from a light source, such as LED, laser, quartz halogen light, fiber optic source, and the like, focusing the collected light through a light uniformization unit where light from the light uniformization unit will be uniform in distribution for uniform illumination, sequentially illuminating the at least one reflective area modulator with light of different colors matching the sensitivities of the different layers in the photosensitive media with a color wheel, using the light of different colors for periods of time corresponding to sensitivities of the corresponding layers of the photosensitive media, passing the light through an optical assembly comprising lens elements to control the light for proper size onto the reflective area modulator, passing the light through a polarization beam splitter element to polarize the light and to discriminate from undesired non-image-forming light reflected by the reflected area modulator, sending image data to the reflective area modulator sequentially to match the corresponding color wheel portion, with a control system
  • a light source such as LED, laser
  • a method of retrofitting conventional mini-lab photographic systems comprises the above methods and upgrading the mini-lab system to use the apparatus to convert the conventional mini-lab system into a system that uses the present inventive method without replacing the entire mini-lab system.
  • a method of exposing an area of a photosensitive media, using at least one reflective area modulator comprises the steps of illuminating with a light source (halogen lamp, laser, LED, and the like) to produce red, green, and blue light in sequence; passing the light through a fiber optic component, light pipe, diffuser box, light valve or lenslet arrays to uniformize the light, condensing the light to illuminate digital film, storing digital images in computer memory, reading the digital images into a computer system, sharpening the image resolution, removing red-eye defects, inserting additional data, transferring processed images onto a reflective area modulator, passing light through a polarization beam splitter, through a projection lens, passing desired light onto digital film, while rejecting undesirable light.
  • a light source halogen lamp, laser, LED, and the like
  • Figure 1 illustrates a layout of a reflective spatial light modulator printing system according to the present invention, using a halogen lamp and a light pipe.
  • Figure 2 illustrates a layout of a reflective spatial light modulator printing system according to the present invention, using a halogen lamp and a fiber optic unit.
  • Figure 3 is a top plan view of a reflective LCD modulator.
  • Figure 4 illustrates a layout of a reflective spatial light modulator printing system according to an alternative embodiment.
  • Figure 5 illustrates a typical mini-lab imaging apparatus, with a negative carrier according to the prior art.
  • Figure 6 illustrates a mini-lab imaging apparatus, comprising a retrofit kit according to one embodiment of the present invention.
  • FIG. 1 illustrates a printer referred to in general by numeral 10.
  • a light source in the form of a broadband visible source with a color filter wheel can be employed. More specifically, a light source such as a halogen lamp 20 can be employed in conjunction with a color filter wheel 40 to ER559320034US 079-01 provide the required color sequential illumination.
  • Rotating color filter wheel 40 separates the illumination in time into red, green and blue spectral bands, and also provides a light blocking position to provide zero illumination blocking intervals.
  • Printer 10 is comprised of a light source 20 which can be in the form of a halogen lamp; light uniformizer, such as a light pipe, 30; a polarization beamsplitter element 50 which can be in the form of a beamsplitting cube; a reflective spatial light modulator 60 in the form of a reflective liquid crystal device (LCD) modulator; a data path (not shown) for providing image information to modulator 60; and a print lens assembly 70.
  • Printer 10 provides a two dimensional image or swaths of area to light sensitive media 80 located at an image plane 150.
  • the color wheel 40 is rotated to select desired colors, for example, red, green, and blue Color wheel 40 spins to three distinct positions for the three distinct colors.
  • Light pipe 30 is designed to illuminate a nearly square or rectangular aperture matching the aspect ratio of the reflective LCD. In general, axially symmetric components are employed in the illumination.
  • a relay lens 90 is positioned immediately before polarization beamsplitter element 50.
  • polarization beamsplitter element 50 may not provide adequate extinction between s polarization state of light and p polarization state of light
  • a linear polarizer 38 may be incorporated prior to beamsplitter element 50.
  • Linear polarizer 38 is used to isolate the polarization state parallel to the axis of polarization beamsplitter element 50. This serves to reinforce the polarization state determined by polarization beamsplitter element 50, decrease leakage light and increase the resulting contrast ratio.
  • Spatial light modulator 60 of this system is designed for a two dimensional reflective polarization based spatial light modulator as is shown in FIG. 3.
  • Modulator 110 includes a plurality of modulator sites 92 that are individually modulatable. Light passes through modulator 110, is reflected off the back of the modulator 110, and returns through modulator 110. If a modulator site 92 is "on" or bright, during the round-trip through modulator 110, the polarization state of the light is rotated. In an ER559320034US 079-01 ideal case the light is rotated 110 degrees. However, this degree of rotation is rarely easily achieved. If a given modulator site is "off or dark, the light is not rotated.
  • the light that is not rotated is not passed straight through the beamsplitter element 50 but is redirected away from the media plane by beamsplitter element 50. It should be noted that light that is rotated by LCD modulator 110 might become elliptically polarized. Upon passing through a linear polarizer, the light will regain linearity. However, light that is not passed through a linear polarizer will retain ellipticity. For this reason, a second linear polarizer 48 may be located between the beamsplitter element 50 and the print lens assembly 70.
  • a print lens assembly 70 Following modulator 60 and beamsplitter element 50 in FIG. 1 is a print lens assembly 70.
  • Lens assembly 70 provides the correct magnification of the image of modulator 60 to image plane 150 where media 80 is located.
  • Print lens assembly 70 is designed to provide magnification relating to a given image size at image plane 150.
  • Printer 10 is comprised of a light source 20 which can be in the form of a halogen lamp, fiber optic component 100; a relay lens 120; a polarization beamsplitter element 50 which can be in the form of a beamsplitting cube; a reflective spatial light modulator 60 which can be in the form of a reflective liquid crystal device (LCD) modulator; a data path (not shown) for providing image information to the modulator 60; and a print lens assembly 70.
  • Printer 10 provides a two dimensional image or swaths of area to light sensitive media 80 located at an image plane 150.
  • the color wheel 40 is rotated to select desired colors, for example, red, green, and blue. Color wheel 40 spins to three distinct positions for the three distinct colors. ER559320034US 079-01
  • Optical fiber component 100 is provided to carry the light from light source, which can be remote from the printer to the spatial light modulator. In general, axially symmetric components may be employed in the illumination. Following fiber optical component 100 is a relay lens 120 that may be positioned immediately before polarization beamsplitter element 50.
  • a fiber optic element 100 uniformizes light from the light source, 20.
  • the light source 20 may be in the form of a broad band visible source (for example, a halogen lamp) in conjunction with a color wheel 40 to provide color sequential illumination.
  • Rotating color filter wheel 40 may separate the illumination in time into red, green and blue spectral bands, and also may provide a light blocking position to provide zero illumination blocking intervals.
  • an LED lamp 200 is used as light_ source of the printer 10. More specifically, the LED lamp is comprised of integrated red, green, and blue LEDs 210, 220, 230, to provide red green, and blue spectral bands.
  • the LED components of the LED lamp may be comprised of the type manufactured by the Norlux Corporation with model number HEX-RGB-A.
  • the LED lamp may be modulated in accordance with the spectral sensitivity of the photosensitive media 80 used and synchronized to the image data provided to modulator 60 by an electronic control circuit (not shown).
  • Printer 10 is thus comprised of an LED lamp 200, light uniformizer, such as a light pipe 30; a relay lens 90; a polarization beamsplitter element 50 which can be in the form of a beamsplitting cube; a reflective liquid crystal device (LCD) modulator; a data path (not shown) for providing reflective spatial light modulator 60; and a print lens assembly 70.
  • Printer 10 provides a two dimensional image or swaths of area to light sensitive media 80 located at an image plane 150.
  • Light pipe 30 is designed to illuminate a nearly square or rectangular aperture matching the aspect ratio of the modulator.
  • axially symmetric components ER559320034US 079-01 are employed in the illumination.
  • a relay lens 90 that is positioned immediately before polarization beamsplitter element 50.
  • the printer moves the media to a next position and another image is recorded.
  • a conventional mini-lab imaging apparatus 320 is illustrated in Figure 5.
  • Such an apparatus may comprise a lens deck station 210, a negative carrier 290, a processor section 220, a culler section 230, a sorter 240, a replenisher tank 250, a paper deck section 250, a printer control section 270, and a light source section 280.
  • a photographic negative (not shown) is inserted into the negative carrier 290, which may also comprise an RGB dichloric filter (not shown).
  • FIG. 6 depicts a mini-lab imaging apparatus 330 retrofitted according to the present invention.
  • the mini-lab imaging apparatus 330 may be a conventional mini-lab imaging apparatus 320, retrofitted to print digital images.
  • the mini-lab imaging apparatus 330 may comprise a lens desk station 210, a retrofit kit 300, a processor section 220, a culler section 230, a sorter 240, a replenisher tank 250, a paper deck section 250, a printer control section 270, a light source section 280, and a computer 340 for controlling exposure of images.
  • the mini-lab imaging apparatus 320 may be retrofitted to process and print digital images by inserting a retrofit kit 300 into the light path of the mini-lab imaging apparatus, for example, between the light source section 280 and the lens deck section 210.
  • a retrofit kit 300 into the light path of the mini-lab imaging apparatus, for example, between the light source section 280 and the lens deck section 210.
  • One may also connect a computer 340 and software.
  • Other components of the mini-lab imaging apparatus 320 may be removed to facilitate retrofitting, and additional components may be used to enable and improve the processing and printing of digital images.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Projection-Type Copiers In General (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

L'invention a trait à un appareil et à un procédé permettant d'imprimer des zones de bandes en deux dimensions sur un support photosensible, qui font appel à au moins un modulateur spatial de lumière à cristaux liquides réfléchissant. Dans ledit appareil et selon ledit procédé, des dispositifs optiques d'éclairage reçoivent de la lumière d'une source lumineuse, et imagent ladite lumière au niveau d'un élément diviseur de faisceau à polarisation. Ledit élément diviseur de faisceau à polarisation image un état de polarisation de ladite lumière au niveau du modulateur spatial de lumière, afin de générer un éclairage sensiblement collimaté au niveau du modulateur spatial de lumière.
PCT/US2004/002174 2003-01-27 2004-01-27 Systeme d'imagerie par modulation a zone reflechissante WO2004068188A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US35236503A 2003-01-27 2003-01-27
US10/352,365 2003-01-27

Publications (2)

Publication Number Publication Date
WO2004068188A2 true WO2004068188A2 (fr) 2004-08-12
WO2004068188A3 WO2004068188A3 (fr) 2005-07-07

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PCT/US2004/002136 WO2004068147A2 (fr) 2003-01-27 2004-01-26 Systeme d'imagerie a modulation de zone reflechissante
PCT/US2004/002174 WO2004068188A2 (fr) 2003-01-27 2004-01-27 Systeme d'imagerie par modulation a zone reflechissante

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7466262B2 (en) 2003-07-03 2008-12-16 Navcom Technology, Inc. Positioning system with a sparse antenna array
US7315275B2 (en) 2003-07-03 2008-01-01 Navcom Technology, Inc. Positioning system with intentional multi-path signal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6215547B1 (en) * 1998-11-19 2001-04-10 Eastman Kodak Company Reflective liquid crystal modulator based printing system
US6779893B2 (en) * 2003-01-24 2004-08-24 Intel Corporation Non-collinear light engine for color imaging systems

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Publication number Publication date
TW200500642A (en) 2005-01-01
WO2004068147A2 (fr) 2004-08-12
WO2004068188A3 (fr) 2005-07-07

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