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    DEVICE FOR DISPLAY OF IMAGE ON SCREEN
    1.
    发明专利
    DEVICE FOR DISPLAY OF IMAGE ON SCREEN 失效

    公开(公告)号：JPH08271855A

    公开(公告)日：1996-10-18

    申请号：JP4709896

    申请日：1996-03-05

    Applicant: IBM

    Inventor： DOANY FUAD ELIAS ,  DOVE DEREK BRIAN ,  SINGH RAMA NAND ,  ROSENBLUTH ALAN EDWARD ,  CHIU GEORGE L ,  CIPOLLA THOMAS MARIO ,  WILCZYNSKI JANUSZ STANISLAW

    IPC: G02F1/13 ,  G02F1/1335 ,  G03B21/00 ,  H04N5/74 ,  H04N9/31

    Abstract: PROBLEM TO BE SOLVED: To provide an efficient and compact optical system for full color high resolution projection type display using a reflective double-refracting spatial light modulator such as a liquid crystal light valve. SOLUTION: This optical system is provided with reflective double-refracting light valves 26-28, a polarized beam splitter 22, color image coupling prisms 30-32, a lighting system 18, a projection lens 38, color/contrast control filters 43-46 and a screen 39 arranged in constitution to provide an advantage of high resolution color display. This optical system is provided with a quarter wavelength plate 48 arranged to suppress stray reflection from the projection lens 38. This optical system is also provided with a second quarter wavelength plate 50 arranged at the screen 39, and a polarizing film 52 arranged at the second quarter wavelength plate 50 so as to restrain the light in the surroundings from illuminating the screen 39 and entering the optical system.

    5.
    发明专利
    未知

    公开(公告)号：BR8606399A

    公开(公告)日：1987-10-13

    申请号：BR8606399

    申请日：1986-12-23

    Applicant: IBM

    Inventor： FAN BUNSEN ,  TIBBETTS RAYMOND EUGENE ,  WILCZYNSKI JANUSZ STANISLAW ,  WHITMAN DAVID FRANCIS

    IPC: H01S3/101 ,  G02B5/02 ,  G02B5/08 ,  G02B27/09 ,  G03F7/20 ,  H01L21/027 ,  H01L21/30 ,  H01S3/10 ,  G02F1/29

    Abstract: A coherent laser beam (12) having a possibly non-uniform spatial intensity distribution is transformed into an in­coherent light beam having a substantially uniform spatial intensity distribution by homogenizing the laser beam with a light tunnel (22) (a transparent light passageway having flat internally reflective side surfaces).When the cross-section of the tunnel is a polygon (as preferred) and the sides of the tunnel are all parallel to the axis of the tunnel (as preferred), the laser light at the exit of the light tunnel (or alternatively at any image plane with respect thereto) will have a substantially uniform intensity distribution and will be incoherent only when the aspect ratio R of the tunnel (length divided by width) equals or exceeds the cotangent of the input beam divergence angle ϑ and whenW min = L coh (R + (1 + R²) 1/2 ) > 2RL coh, where W min is the minimum required width for the light tunnel, and L coh is the effective coherence length of the laser light being homogenized.

    7.
    发明专利
    未知

    公开(公告)号：DE69125328D1

    公开(公告)日：1997-04-30

    申请号：DE69125328

    申请日：1991-07-18

    Applicant: IBM

    Inventor： SINGH RAMA NAND ,  WILCZYNSKI JANUSZ STANISLAW

    IPC: G02B13/24 ,  G02B13/26 ,  G02B17/00 ,  G02B17/08 ,  G02B27/00 ,  G02B27/18 ,  G03F7/20

    Abstract: An optical system having a substantially flat image field (14) is disclosed. The optical system is formed from optical subsystem(18, 12, 20, 22) wherein an input optical subsystem (8) forms an intermediate image (10) which is the object of an output optical system (12). The intermediate image has a curvature which compensates that from the remaining optical components of the system to result in a substantially flat image for the optical system. Preferably, the optical elements preceding the intermediate image and the optical elements succeeding the intermediate image are separately corrected for odd aberrations. The optical elements preceding the intermediate image and the optical elements succeeding the intermediate image compensate for each other and result in a substantially aberration free flat image for the optical system. The optical system preferably contains an input optical subsystem (8) and an output optical subsystem (12) wherein the input optical subsystem is a catadioptric system and wherein the output optical system is a dioptric system. Most preferably the input optical system is a 1X catadioptric system and the output optical system is an NX dioptric system. The optical systems of the present invention are used for subquarter micron photolithography tools for microelectronic fabrication, such as scanners and steppers.

    9.
    发明专利
    未知

    公开(公告)号：DE69611560T2

    公开(公告)日：2001-06-21

    申请号：DE69611560

    申请日：1996-02-13

    Applicant: IBM

    Inventor： CHIU GEORGE LIANG-TAI ,  CIPOLLA THOMAS MARIO ,  DOANY FUAD ELIAS ,  DOVE DEREK BRIAN ,  ROSENBLUTH ALAN EDWARD ,  SINGH RAMA NAND ,  WILCZYNSKI JANUSZ STANISLAW

    IPC: G02F1/13 ,  G02F1/1335 ,  H04N5/74 ,  H04N9/31

    Abstract: An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration offering advantages for a high resolution color display. In particular, the present invention includes a color splitting prism assembly having a plurality of output faces through which a separate color component is directed to be reflected by a respective light valve. Color absorbing filters are disposed at each of the output faces to absorb the color components not corresponding to the color directed through each output face.

    10.
    发明专利
    未知

    公开(公告)号：DE3778387D1

    公开(公告)日：1992-05-27

    申请号：DE3778387

    申请日：1987-01-16

    Applicant: IBM

    Inventor： FAN BUNSEN ,  TIBBETTS RAYMOND EUGENE ,  WILCZYNSKI JANUSZ STANISLAW ,  WHITMAN DAVID FRANCIS

    IPC: H01S3/101 ,  G02B5/02 ,  G02B5/08 ,  G02B27/09 ,  G03F7/20 ,  H01L21/027 ,  H01L21/30 ,  G02B27/00

    Abstract: A coherent laser beam (12) having a possibly non-uniform spatial intensity distribution is transformed into an in­coherent light beam having a substantially uniform spatial intensity distribution by homogenizing the laser beam with a light tunnel (22) (a transparent light passageway having flat internally reflective side surfaces).When the cross-section of the tunnel is a polygon (as preferred) and the sides of the tunnel are all parallel to the axis of the tunnel (as preferred), the laser light at the exit of the light tunnel (or alternatively at any image plane with respect thereto) will have a substantially uniform intensity distribution and will be incoherent only when the aspect ratio R of the tunnel (length divided by width) equals or exceeds the cotangent of the input beam divergence angle ϑ and whenW min = L coh (R + (1 + R²) 1/2 ) > 2RL coh, where W min is the minimum required width for the light tunnel, and L coh is the effective coherence length of the laser light being homogenized.

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