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    • 8. 发明授权
    • Hologram screen and a method of producing the same
    • 全息图及其制作方法
    • US06597477B2
    • 2003-07-22
    • US10106777
    • 2002-03-26
    • Kenichiro TakadaMasahiro Shiozawa
    • Kenichiro TakadaMasahiro Shiozawa
    • G02B532
    • G02B27/0103G02B5/32G02B2027/0118
    • In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′, v′) at the point A is given by (u′A, v′A) and the value of the CIE 1976 chromaticity coordinate (u′, v′) at the point B is given by (u′B, v′B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference &Dgr;u′v′ between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by, &Dgr;u′v′=[(u′A−u′B)2+(v′A−v′B)2]1/2  (1) Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference &Dgr;u′v′ between two points A and B is derived from the above formula (1) and given by 0.01 or less, where, the formula (2) is expressed by, H/2L=0.1  (2) in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen in the direction of the height.
    • 在用于根据通过从图像投影仪散射和扩散图像光而获得的输出光再现图像的全息图屏幕中,当白光(图像光)投影在全息图屏幕上时; 并且当在全息屏幕的表面上的可选的两个点A和B处的两点之间的距离为20cm或更小时,并且点A处的CIE1976色度坐标(u',v')的值为 由(u'A,v'A)给出,并且点B处CIE 1976色度坐标(u',v')的值由(u'B,v'B)给出; 从全息屏的表面垂直的输出光具有颜色分布,其中两点A和B之间的色差DELTAu'v'由下式(1)导出并由0.06或更小给出,其中,式 (1)表示。此外,从全息图的表面输出到由下式(2)定义的视点的输出光具有其中两个之间的色差DELTAu'v'的颜色分布 点A和B由上式(1)得出,给出为0.01以下,其中式(2)由公式(2)表示,L是视点与中心之间的距离 全息屏幕,H是全息屏幕在高度方向上的长度。
    • 9. 发明授权
    • Method for producing a hologram and a display device using the same
    • 制造全息图的方法和使用该全息图的显示装置
    • US06198554B1
    • 2001-03-06
    • US08741175
    • 1996-10-29
    • Tomoyuki KandaKazutoshi KoieKatsuyoshi NishiiMasahiro ShiozawaKatsumi KamiyaAtsuo Ishizuka
    • Tomoyuki KandaKazutoshi KoieKatsuyoshi NishiiMasahiro ShiozawaKatsumi KamiyaAtsuo Ishizuka
    • G03H102
    • G02B5/32G03H1/0256G03H1/04G03H1/0404G03H1/0486G03H1/22G03H1/265G03H1/28G03H2001/2239G03H2001/306G03H2223/14G03H2240/51G03H2240/53G03H2250/32G03H2260/10H04N7/144
    • A method for producing a hologram recording an interference fringe formed by an object light and a reference light on a photosensitive dry plate, and the object light either having diffusing and scattering characteristics or being passed through an optical diffusion body, mainly includes the following steps: In a first step, a ratio &eegr;RO/&eegr;OO of a first diffraction efficiency &eegr;OO and a second diffraction efficiency &eegr;RO, is calculated. The diffraction efficiency &eegr;OO is dependent on two object light beams. The efficiency &eegr;RO is dependent on the object light and the reference light. In a second step, the intensity EO of the object light and the intensity ER of the reference light is adjusted in such a way that the ratio &eegr;RO/&eegr;OO is set to at least 10 and the efficiency &eegr;OO does not exceed 5%. A display device using the above hologram is structured by a display unit for generating a signal light; a hologram screen formed by either reflection or transmission hologram, and a projecting unit for projecting the signal light to the hologram screen. According to the present invention, it is possible to easily produce a hologram, for example, a screen hologram, having no cloudiness or cloudy state when an observer observes an image displayed on the screen, and to a display device using the above hologram screen.
    • 一种用于产生记录由感光干板上的物体光和参考光形成的干涉条纹的全息图的方法以及具有漫射和散射特性或通过光漫射体的目标光主要包括以下步骤: 在第一步骤中,计算第一衍射效率etaOO和第二衍射效率etaRO的比率ηηRO/ eta。 衍射效率etaOO取决于两个物体光束。 效率etaRO取决于物体光和参考光。 在第二步骤中,调整对象光的强度EO和参考光的强度ER,使得etaRO / eta00的比率设定为至少10,效率etaOO不超过5%.A显示 使用上述全息图的装置由用于产生信号光的显示单元构成; 通过反射或透射全息图形成的全息屏幕和用于将信号光投射到全息屏幕的投影单元。根据本发明,可以容易地生成全息图,例如没有浑浊的全息图 或观察者观察屏幕上显示的图像时的混浊状态,以及使用上述全息图的显示装置。