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    Projection screen and image display apparatus
    3.
    发明申请
    Projection screen and image display apparatus 审中-公开
    投影屏幕和图像显示设备

    公开(公告)号：US20070002281A1

    公开(公告)日：2007-01-04

    申请号：US11450677

    申请日：2006-06-09

    申请人： Hiroki Yoshikawa ,  Takanori Hisada ,  Tetsu Ohishi ,  Koji Hirata ,  Daisuke Imafuku

    发明人： Hiroki Yoshikawa ,  Takanori Hisada ,  Tetsu Ohishi ,  Koji Hirata ,  Daisuke Imafuku

    IPC分类号： G03B21/14

    CPC分类号： G03B21/10 ,  G03B21/625

    摘要： A fresnel lens sheet has a fresnel center in the vicinity of a lower end, and includes first and second fresnel lens portions respectively formed into concentrically circular shapes. The first fresnel lens portion exists inside a reference circumference, and the second fresnel lens portion exists outside the reference circumference. A conjugate point distance of the second fresnel lens portion is shorter than a conjugate point distance of the first fresnel lens portion. The reference circumference passes through vicinities of cross points between a horizontal centerline, which halves the fresnel lens sheet into upper and lower portions, and left and right ends of the fresnel lens sheet.

    摘要翻译： 菲涅尔透镜片在下端附近具有菲涅耳中心，并且包括分别形成为同心圆形的第一和第二菲涅耳透镜部。 第一菲涅耳透镜部分存在于参考圆周内，第二菲涅尔透镜部分存在于参考圆周外。 第二菲涅尔透镜部分的共轭点距离比第一菲涅尔透镜部分的共轭点距离短。 参考圆周穿过菲涅耳透镜片的水平中心线之间的交叉点附近，该中心线将菲涅尔透镜片半部分分成上下部分，以及左右两端。

    Image display apparatus, as well as, Fresnel lens sheet and screen to be used therein
    5.
    发明授权
    Image display apparatus, as well as, Fresnel lens sheet and screen to be used therein 有权
    图像显示装置，以及其中使用的菲涅耳透镜片和屏幕

    公开(公告)号：US07551352B2

    公开(公告)日：2009-06-23

    申请号：US11200354

    申请日：2005-08-08

    申请人： Tetsu Ohishi ,  Hiroki Yoshikawa ,  Takanori Hisada ,  Koji Hirata ,  Masahiko Yatsu ,  Daisuke Imafuku

    发明人： Tetsu Ohishi ,  Hiroki Yoshikawa ,  Takanori Hisada ,  Koji Hirata ,  Masahiko Yatsu ,  Daisuke Imafuku

    IPC分类号： G03B21/56 ,  G03B21/60

    CPC分类号： H04N5/74 ,  G03B21/10 ,  G03B21/625

    摘要： To eliminate or otherwise reduce non-uniform brightness of an image of a display apparatus, an image is projected through a projection optical system having a projection lens (2), curved surface reflection mirrors (4 and 5), and a reflection mirror (6) onto a rear surface of the rear-surface projection type screen (3). The rear-surface projection type screen includes a Fresnel lens sheet (8), wherein the prism surfaces of the Fresnel lens are formed in an aspheric configuration, thereby letting the light beams from the screen to exit at an exit angle of about zero (0) degree relative to a line perpendicular to the screen surface, over most of the entire surface thereof. It is possible to obtain a projection image that having uniform brightness in an image display apparatus while maintaining a thin cabinet (7) profile.

    摘要翻译： 为了消除或以其他方式减少显示装置的图像的不均匀亮度，通过具有投影透镜（2），弯曲表面反射镜（4和5）和反射镜（6）的投影光学系统投影图像 ）到后表面投影型屏幕（3）的后表面上。 背面投影型屏幕包括菲涅耳透镜片（8），其中菲涅尔透镜的棱镜表面形成为非球面形状，从而使来自屏幕的光束以大约零（0 ）相对于垂直于屏幕表面的线，在其大部分整个表面上。 在保持薄柜（7）轮廓的同时，可以获得在图像显示装置中具有均匀亮度的投影图像。

    Image display apparatus, as well as, Fresnel lens sheet and screen to be used therein
    7.
    发明申请
    Image display apparatus, as well as, Fresnel lens sheet and screen to be used therein 有权
    图像显示装置，以及其中使用的菲涅耳透镜片和屏幕

    公开(公告)号：US20060092511A1

    公开(公告)日：2006-05-04

    申请号：US11200354

    申请日：2005-08-08

    申请人： Tetsu Ohishi ,  Hiroki Yoshikawa ,  Takanori Hisada ,  Koji Hirata ,  Masahiko Yatsu ,  Daisuke Imafuku

    发明人： Tetsu Ohishi ,  Hiroki Yoshikawa ,  Takanori Hisada ,  Koji Hirata ,  Masahiko Yatsu ,  Daisuke Imafuku

    IPC分类号： G03B21/56

    CPC分类号： H04N5/74 ,  G03B21/10 ,  G03B21/625

    摘要： For dissolving ununiformity in the brightness of a projection image within a display image apparatus, obtaining an enlarged projection image through an oblique projection of image lights onto a rear-surface projection type screen, wherein an image from an image generating source 1 is projected through a projection optical system, having a projection lens 2, curved surface reflection mirrors 4 and 5, a reflection mirror 6, from a rear surface of the rear-surface projection type screen 3, within a housing 7 being narrow in depth thereof; the rear-surface projection type screen includes a Fresnel lens sheet 8, wherein the prism surfaces of the Fresnel lens making up the Fresnel lens sheet are formed in an aspheric configuration, thereby letting the light beams from the screen to exit at an exit angle of about zero (0) degree, almost all over the entire surface thereof. With this, it is possible to obtain a projection image, being uniform in the brightness thereof as a whole, and thin-sizing of the image display apparatus, as well.

    摘要翻译： 为了溶解显示图像装置内的投影图像的亮度的不均匀性，通过图像光的倾斜投影获得放大的投影图像到背面投影型屏幕上，其中来自图像生成源1的图像通过 投影光学系统，具有投影透镜2，曲面反射镜4和5，来自后表面投影型屏幕3的后表面的反射镜6在壳体7内的深度较窄; 后表面投影型屏幕包括菲涅耳透镜片8，其中构成菲涅尔透镜片的菲涅耳透镜的棱镜表面形成为非球面形状，从而使来自屏幕的光束以出射角 大约零（0）度，几乎遍及其整个表面。 由此，可以获得整体上的亮度均匀的投影图像，以及图像显示装置的薄型化。

    Screen, a fresnel lens sheet used for the screen, and an image display apparatus using the screen
    8.
    发明授权
    Screen, a fresnel lens sheet used for the screen, and an image display apparatus using the screen 有权
    屏幕，用于屏幕的菲涅尔透镜片以及使用该屏幕的图像显示装置

    公开(公告)号：US07440186B2

    公开(公告)日：2008-10-21

    申请号：US11281819

    申请日：2005-11-18

    申请人： Hiroki Yoshikawa ,  Tetsu Ohishi ,  Daisuke Imafuku ,  Koji Hirata

    发明人： Hiroki Yoshikawa ,  Tetsu Ohishi ,  Daisuke Imafuku ,  Koji Hirata

    IPC分类号： G03B21/56 ,  G02B3/08

    CPC分类号： G03B21/10 ,  G03B21/625

    摘要： The present invention provides a technology suitable for shortening a depth of a image display apparatus while obtaining a picture of high quality. According to the invention, a total reflection prism portion is provided on a side of a Fresnel lens sheet toward a picture source. The total reflection prism portion reflects an incident light to a direction toward an optic axial center of the Fresnel lens sheet to have the same outgoing. On the other hand, a first refractive prism portion, by which light of a predetermined incident angle or less is refracted to outgo to a direction along an optical axis of the Fresnel lens sheet, and a second refractive prism portion, by which light reflected to the direction toward the optic axial center of the Fresnel lens sheet is changed to the direction along the optical axis.

    摘要翻译： 本发明提供一种适于在获得高品质图像的同时缩短图像显示装置的深度的技术。 根据本发明，在菲涅尔透镜片的朝向图像源的一侧设置全反射棱镜部分。 全反射棱镜部分将入射光反射到朝向菲涅耳透镜片的光学轴向中心的方向以具有相同的出射。 另一方面，第一折射棱镜部分，通过该第一折射棱镜部分，预定入射角或更小的光被折射到沿着菲涅尔透镜片的光轴的方向偏离，并且第二折射棱镜部分被反射到 朝向菲涅尔透镜片的光轴中心的方向改变为沿着光轴的方向。

    Image display device
    9.
    发明申请
    Image display device 审中-公开
    图像显示装置

    公开(公告)号：US20070052341A1

    公开(公告)日：2007-03-08

    申请号：US11452373

    申请日：2006-06-14

    申请人： Daisuke Imafuku ,  Hiroki Yoshikawa ,  Tetsu Ohishi

    发明人： Daisuke Imafuku ,  Hiroki Yoshikawa ,  Tetsu Ohishi

    IPC分类号： H01J1/62

    CPC分类号： H05B33/22 ,  G09G3/3413 ,  G09G2310/024 ,  G09G2320/0626 ,  G09G2360/145 ,  H04N9/3155 ,  H04N9/3182 ,  H04N9/3194

    摘要： The invention provides a technology suited to suppress decrease in the brightness of an image while preventing reduction in the contrast of the image caused by external light coming from the outside (from the viewer side of the image) of a screen. An image display surface (screen) of a projection type display device is provided with a front protective sheet including an optical filter member for absorbing specific wavelengths in the external light, especially among peak wavelengths of a three-wavelength fluorescent lamp. Moreover, LED's of three colors are used as a light source for forming an image. At least one of these LED's emits a light of a different wavelength from a peak wavelength that the front protective sheet absorbs. By this configuration, it is possible to prevent reduction in the contrast of an image caused by external light without decreasing the brightness of the image display device.

    摘要翻译： 本发明提供了一种适合于抑制图像的亮度降低的技术，同时防止从外部（来自图像的观看者侧）的外部光引起的图像的对比度降低。 投影型显示装置的图像显示面（屏幕）设置有前保护片，其包括用于吸收外部光中的特定波长的滤光器构件，特别是在三波长荧光灯的峰值波长中。 此外，三种颜色的LED用作形成图像的光源。 这些LED中的至少一个发射与前保护片吸收的峰值波长不同波长的光。 通过这种配置，可以防止由外部光引起的图像的对比度降低，而不会降低图像显示装置的亮度。

    Screen, Fresnel lens sheet used for the same, and image display apparatus using the same
    10.
    发明授权
    Screen, Fresnel lens sheet used for the same, and image display apparatus using the same 有权
    用于其的屏幕，菲涅尔透镜片和使用其的图像显示装置

    公开(公告)号：US07403335B2

    公开(公告)日：2008-07-22

    申请号：US11011188

    申请日：2004-12-15

    申请人： Hiroki Yoshikawa ,  Tetsu Ohishi ,  Koji Hirata ,  Daisuke Imafuku

    发明人： Hiroki Yoshikawa ,  Tetsu Ohishi ,  Koji Hirata ,  Daisuke Imafuku

    IPC分类号： G03B21/60 ,  G03B21/00 ,  G03B21/26 ,  G03B21/14 ,  G03B21/28

    CPC分类号： G03B21/10 ,  G03B21/625

    摘要： The present invention provides a screen suitable for reducing the longitudinal dimension of a set. The present invention includes two prism sections. One is a totally reflective prism section (10) provided at the image generation source side of a Fresnel lens sheet (6). The other is a refractive prism section (11) provided at the image-watching side of the Fresnel lens sheet. The refractive prism section (11) includes a refractive face (e) for refracting incident light and making the light exit toward the image-watching side, a plane (f) approximately parallel to the principal plane of the Fresnel lens sheet, and a connection face (g) for continuously forming the face (e) and the plane (f).

    摘要翻译： 本发明提供了一种适于减小组的纵向尺寸的屏幕。 本发明包括两个棱镜部分。 一个是设置在菲涅耳透镜片（6）的图像生成源侧的全反射棱镜部（10）。 另一个是设置在菲涅尔透镜片的图像观看侧的折射棱镜部分（11）。 折射棱镜部分（11）包括用于折射入射光并使光从摄像侧射出的折射面（e），大致平行于菲涅尔透镜片的主平面的平面（f），以及连接 面（g）用于连续地形成面（e）和平面（f）。