公开(公告)号：US5446594A

公开(公告)日：1995-08-29

申请号：US215936

申请日：1994-03-21

申请人： John C. Nelson ,  Dennis F. Vanderwerf

发明人： John C. Nelson ,  Dennis F. Vanderwerf

IPC分类号： G03B21/132 ,  G02B3/08

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： A low-profile transmissive overhead projector employs a folded optical path and an off-axis Fresnel lens condensing system which includes a catadioptric lens element. This lens provides a fast condensing system which allows collimation, dispersion, or concentration of light striking the lens at a high angle of incidence, with efficient transmission to the far edge of the lens. This also enables additional reduction in the OHP base height by allowing the single mirror to be mounted at a flatter angle, with the light source still maintained at a position below (and adjacent) the stage. A novel catadioptric lens design further imparts achromaticity to the element, so that it may be constructed of any material, regardless of its index of refraction. The condensing system may have a single or doublet catadioptric lens.

摘要翻译： 低调透射高架投影仪采用折叠光路和离轴菲涅尔透镜冷凝系统，其包括反射折射透镜元件。 该透镜提供快速冷凝系统，其允许以高入射角度对透镜进行准直，分散或集中，并有效地透射到透镜的远边缘。 这也使得通过允许单个反射镜以更平坦的角度安装OHP基座高度，使得光源仍然保持在阶段（并且靠近）的位置。 新颖的反射折射透镜设计进一步赋予元件不消色性，使得它可以由任何材料构成，而不管折射率如何。 冷凝系统可以具有单个或双折射反射折射透镜。

公开(公告)号：US5442415A

公开(公告)日：1995-08-15

申请号：US288697

申请日：1994-08-15

申请人： Zu W. Chao

发明人： Zu W. Chao

IPC分类号： G03B21/132 ,  G03B21/28

CPC分类号： G03B21/28 ,  G03B21/132 ,  Y10S353/03

摘要： An armless transparency projector comprises: a projector main body having an opening; a light source lamp installed inside the projector main body for emitting light needed to project a picture on a distant screen; a Fresnel lens tilted at an angle as to catch the light from the light source, and installed inside the projector main body for holding a transparency; an image reflecting mirror installed inside the projector main body for reflecting the converging light from the Fresnel lens; and a projector lens installed inside the projector main body for projecting the image converged through the aperture of the projector lens along the light axis, to the distant screen.

摘要翻译： 无臂透明投影仪包括：具有开口的投影仪主体; 安装在投影仪主体内的光源灯，用于发射在远处屏幕上投影图像所需的光; 菲涅尔透镜以一定角度倾斜以捕获来自光源的光，并且安装在投影仪主体内以保持透明度; 安装在投影仪主体内部的用于反射来自菲涅耳透镜的会聚光的图像反射镜; 以及投影仪透镜，其安装在投影仪主体内部，用于将沿投影透镜的孔径会聚的图像沿着光轴投射到远处的屏幕。

公开(公告)号：US5416541A

公开(公告)日：1995-05-16

申请号：US243199

申请日：1994-05-16

申请人： Stephen C. Fog

发明人： Stephen C. Fog

IPC分类号： G03B21/132 ,  G03B21/30

CPC分类号： G03B21/132 ,  G03B21/30 ,  Y10S353/03

摘要： A folding, portable overhead projector includes a thin stage body housing a fresnel lens on its top surface. The stage body is thicker on one side to form a lamp enclosure. A hinged mirror is provided within the stage body below the fresnel lens and a hinged lamp socket is provided within the lamp enclosure. Two pairs of folding legs are hingedly coupled to the stage body and the lamp enclosure and fold out from under the projector to lower the mirror and lamp and form a collapsible base for the projector. When unfolded, the legs tilt the lamp and the mirror so that light from the lamp is reflected by the mirror up through the fresnel lens on the stage. A collapsible bellows, a light baffle, and the mirror provide a substantially light and airtight enclosure for the lamp and mirror. Additional pairs of folding legs provide balance for the projector. At least one pair of legs are biased by a torsion spring and all of the legs are coupled to each other so that opening and closing is performed in a single action. An articulating foldable arm carrying a projection lens and mirror is attached to the lamp enclosure and is positionable over the stage. A high efficiency cooling fan cools both the lamp add the stage. Interlock and temperature safety switches are provided as well as unswitched accessory outlets. The projector is extremely light weight and collapses to a thin package which can fit into a brief case.

摘要翻译： 折叠便携式高架投影仪包括在其顶表面上容纳菲涅耳透镜的薄台体。 台身在一侧较厚，形成灯罩。 在菲尼尔透镜下方的舞台体内设置铰链镜，并且在灯罩内提供铰接的灯座。 两对折叠腿铰接地连接到舞台主体和灯罩，并从投影机下方折叠以降低镜子和灯泡，并形成投影机的可折叠底座。 当展开时，腿倾斜灯和镜子，使得来自灯的光被镜子反射通过舞台上的菲涅尔透镜。 可折叠的波纹管，光挡板和镜子为灯和镜提供了基本上轻便且气密的外壳。 额外的折叠腿对可为投影机提供平衡。 至少一对腿被扭转弹簧偏置，并且所有腿彼此联接，使得打开和关闭在单个动作中执行。 携带投影透镜和反射镜的铰接折叠臂附接到灯罩并且可定位在台上。 高效率的冷却风扇冷却灯泡，增加了舞台。 提供联锁和温度安全开关以及未开关的附件插座。 投影机重量非常轻，并且可以折叠成一个可以装入简易外壳的薄包装。

公开(公告)号：US5404186A

公开(公告)日：1995-04-04

申请号：US267558

申请日：1994-06-28

申请人： William T. Stokes

发明人： William T. Stokes

IPC分类号： G03B21/132 ,  G06F15/02 ,  G09B5/00 ,  G03B21/00

CPC分类号： G09B5/00 ,  G03B21/132 ,  G06F15/0216 ,  Y10S353/03 ,  Y10S353/05

摘要： A hand-held calculator has a transparent window carrying a liquid crystal display as well as transparent number and function key locations such that when placed on an overhead projector, the calculator can be used to demonstrate to a classroom of students all operations performed in a sequence of mathematical operations. The plastic casing of the calculator has one or more small holes passing through the casing at corners, so that a string or line can be used to tether the calculator to the overhead projector, preventing damage to the calculator from a fall to the floor. A further feature of the calculator is a protrusion or foot at each corner of the back of the calculator casing, for holding the back surface of the calculator slightly above the light platform of the overhead projector, for cooling of the liquid crystal display by air passing between the light table and calculator.

摘要翻译： 手持式计算器具有透明的窗口，携带液晶显示器以及透明的数字和功能键位置，使得当放置在高架投影仪上时，计算器可用于向学生向课堂展示按顺序执行的所有操作 的数学运算。 计算器的塑料外壳有一个或多个小孔穿过外壳在角落处，从而可以使用弦或线将计算器系在高架投影仪上，防止计算器从落地到地面受到损坏。 计算器的另一个特征是在计算器外壳背部的每个角落处的突起或脚，用于将计算器的后表面稍微保持在高架投影仪的光平台上方，用于通过空气通过来冷却液晶显示器 在光台和计算器之间。

公开(公告)号：US5319400A

公开(公告)日：1994-06-07

申请号：US1301

申请日：1993-01-06

申请人： Alan J. Herbert ,  Dwight L. Evans ,  Terrance J. Russell

发明人： Alan J. Herbert ,  Dwight L. Evans ,  Terrance J. Russell

IPC分类号： G03B21/32 ,  G03B21/132 ,  G03G7/00 ,  G03B21/30

CPC分类号： G03G7/00 ,  G03B21/132 ,  Y10S353/03

摘要： A sheet of imageable film for use in an overhead projector is provided with at least one, and preferably two, opaque flaps attached in a foldable manner to the film so that the flaps may be unfolded to prevent unwanted light from shining past the edges of the transparency.

摘要翻译： 一种在高架投影仪中使用的可成像薄膜片具有至少一个，优选两个不透明的翼片，其以可折叠的方式附接到薄膜上，使得折片可以展开，以防止不需要的光照射通过 透明度。

公开(公告)号：US5296882A

公开(公告)日：1994-03-22

申请号：US988851

申请日：1992-12-21

申请人： John C. Nelson ,  Robert M. Fesler ,  Dennis F. Vanderwerf

发明人： John C. Nelson ,  Robert M. Fesler ,  Dennis F. Vanderwerf

IPC分类号： G03B21/132 ,  G03B21/28

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： A low-profile transmissive overhead projector employs a folded optical path and an off-axis Fresnel lens condensing system which includes a catadioptric lens element. This lens provides a fast condensing system which allows collimation, dispersion, or concentration of light striking the lens at a high angle of incidence, with efficient transmission to the far edge of the lens. This also enables additional reduction in the OHP base height by allowing the single mirror to be mounted at a flatter angle, with the light source still maintained at a position below (and adjacent) the stage. A novel catadioptric lens design further imparts achromaticity to the element, so that it may be constructed of any material, regardless of its index of refraction. The condensing system may have a single or doublet catadioptric lens.

摘要翻译： 低调透射高架投影仪采用折叠光路和离轴菲涅尔透镜冷凝系统，其包括反射折射透镜元件。 该透镜提供快速冷凝系统，其允许以高入射角度对透镜进行准直，分散或集中，并有效地透射到透镜的远边缘。 这也使得通过允许单个反射镜以更平坦的角度安装OHP基座高度，使得光源仍然保持在阶段（并且靠近）的位置。 新颖的反射折射透镜设计进一步赋予元件不消色性，使得它可以由任何材料构成，而不管折射率如何。 冷凝系统可以具有单个或双折射反射折射透镜。

公开(公告)号：US5052798A

公开(公告)日：1991-10-01

申请号：US497879

申请日：1990-03-23

申请人： Terry L. Mardis

发明人： Terry L. Mardis

IPC分类号： G03B21/132

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： A highlighter module, adaptable to an overhead viewer is disclosed. The highlighter, when placed on top of an overhead viewer, will highlight a segment of the displayed information by moving a curtain to the desired location. This curtain, attached to tension cables, forms a continuous movement in either direction. The highlighter can be used with or without a cable remote control.

摘要翻译： 公开了一种适用于俯视观测器的荧光笔模块。 荧光笔放置在顶部观看者的顶部时，将通过将窗帘移动到所需位置来突出显示所显示信息的一部分。 连接在张力电缆上的这种窗帘在任一方向上形成连续的运动。 荧光笔可以使用或不使用电缆遥控器。

公开(公告)号：US4839731A

公开(公告)日：1989-06-13

申请号：US219342

申请日：1988-07-15

申请人： Yasuhiko Saka

发明人： Yasuhiko Saka

IPC分类号： G03B21/132 ,  G03B21/00 ,  G03B33/12 ,  H04N1/00 ,  H04N1/50

CPC分类号： H04N1/00249 ,  H04N1/50 ,  Y10S353/03 ,  Y10S84/03

摘要： A color overhead projector including a thermochromic film, a color filter, erasing means for erasing an image formed on the film, reading means for reading a color image to be projected, writing means for writing the color image to be projected into the film, and projecting means for projecting the color image written into the film onto a screen by illumining the film via the color filter.

摘要翻译： 一种彩色高架投影仪，包括热致变色膜，滤色器，用于擦除形成在胶片上的图像的擦除装置，用于读取要投影的彩色图像的读取装置，用于将要投影的彩色图像写入到胶片中的写入装置，以及 投影装置，用于通过经由滤色器照射胶片，将写入胶片的彩色图像投影到屏幕上。

公开(公告)号：US4436392A

公开(公告)日：1984-03-13

申请号：US455424

申请日：1983-01-03

申请人： Dennis F. Vanderwerf

发明人： Dennis F. Vanderwerf

IPC分类号： G03B21/132 ,  G03B21/14

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： An overhead projector which projects a distortion-free image onto a vertical screen at an oblique angle above the horizontal plane. In a first embodiment of the invention, a projection lens and mirror are displaced from the center of a transparency stage in the direction of projection and a thin, linear, incrementally-grooved prismatic sheet is positioned parallel to the stage and between the stage and a lighting means to redirect light transmitted through the stage and the transparency to the projection lens. In a second embodiment of the invention, the grooved prism is formed as an integral part of the lighting means.

摘要翻译： 一种高架投影仪，其以水平面上方的倾斜角度将无失真图像投影到垂直屏幕上。 在本发明的第一实施例中，投影透镜和反射镜从突出方向的透明度台的中心位移，并且薄的，线性的，渐进凹槽的棱镜片平行于平台定位，并且在平台和平台之间 照明装置将透过舞台的光线和透明度重定向到投影透镜。 在本发明的第二实施例中，开槽棱镜形成为照明装置的组成部分。

公开(公告)号：US4353627A

公开(公告)日：1982-10-12

申请号：US194827

申请日：1980-10-07

申请人： Takashi Maemori

发明人： Takashi Maemori

IPC分类号： G03B21/132 ,  G03B1/48 ,  G03B21/14

CPC分类号： G03B21/132 ,  Y10S353/03 ,  Y10S353/05 ,  Y10S353/06

摘要： An over head projector has a standard projection lens for projecting the whole view of an original image and a partial projection lens for projecting a part of the original image in enlarged scale. One of the projection lenses is selectively brought to a projection position for projecting the original image onto a projection screen. A stage for supporting the original image is vertically movable and is moved up and down when the projection lens is changed. The selection of the projection lens and the vertical movement of the stage are associated with each other so that the original image is always at a proper position with respect to the focal length of the selected projection lens.

摘要翻译： 一顶投影机具有用于投影原始图像的整个视图的标准投影透镜和用于以放大比例投影原始图像的一部分的部分投影透镜。 其中一个投影透镜选择性地被带到用于将原始图像投影到投影屏幕上的投影位置。 用于支撑原始图像的平台可垂直移动，并且当投影透镜改变时上下移动。 投影透镜的选择和平台的垂直运动彼此相关联，使得原始图像总是处于相对于所选择的投影透镜的焦距的适当位置。