公开(公告)号：US5325218A

公开(公告)日：1994-06-28

申请号：US999230

申请日：1992-12-31

申请人： Stephen J. Willett ,  Gary L. Tritle

发明人： Stephen J. Willett ,  Gary L. Tritle

IPC分类号： G02F1/13 ,  G02F1/1335 ,  G02F1/13357 ,  G02F1/1347 ,  G02F1/133 ,  G03B21/00

CPC分类号： G02F1/13473 ,  G02F1/133536 ,  G02F1/133621 ,  G02F2001/133543 ,  G02F2201/343 ,  Y10S353/03 ,  Y10S353/05

摘要： A liquid crystal display (LCD) panel employs a cholesteric polarizer which passes light of a first circular polarization, but reflects light of a second circular polarization. The LCD panel may be monochrome or color; in the color embodiments, several different color filters are used, each having one or more cholesteric polarizers tuned to a specific bandwidth in the visible spectrum. These polarizers replace dyed (neutral or dichroic) polarizers of prior art LCD panels, and provide improved color purity. The invention may be enhanced by providing a light recycling scheme whereby the handedness of the circularly polarized light reflected by the polarizers is changed and redirected back to the polarizers. This recycling scheme may also be adapted to provide an overhead projector having a high output polarized light source, particularly useful in conjunction with an LCD panel.

摘要翻译： 液晶显示器（LCD）面板采用通过第一圆偏振光，但反射第二圆偏振光的胆甾型偏振器。 LCD面板可能是单色或彩色; 在颜色实施例中，使用几种不同的滤色器，每种滤色器具有调谐到可见光谱中的特定带宽的一个或多个胆甾型偏振器。 这些偏振器代替现有技术的LCD面板的染色（中性色或二向色）偏振片，并提供改善的色纯度。 本发明可以通过提供一种光循环方案来增强，由此偏振器反射的圆偏振光的旋转性被改变并被重定向回到偏振器。 该回收方案还可以适于提供具有高输出偏振光源的高架投影仪，其特别适用于LCD面板。

公开(公告)号：US5245370A

公开(公告)日：1993-09-14

申请号：US960562

申请日：1992-10-22

申请人： James E. Peterson

发明人： James E. Peterson

IPC分类号： G03B21/132

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

摘要： An adjustment mechanism for use with an overhead projector having a post extending upwardly to support a projection head attached to the attachment mechanism incudes a wear pad partially surrounding the post, a friction pad disposed opposite the wear pad with respect to the post and a spring for urging the friction pad into the post.

摘要翻译： 一种用于具有向上延伸以支撑附接到附接机构的突出头的柱头的高架投影仪的调节机构包括部分地围绕柱的磨损垫，相对于柱而与耐磨垫相对布置的摩擦垫，以及用于 推动摩擦垫进入柱子。

公开(公告)号：US5035502A

公开(公告)日：1991-07-30

申请号：US400158

申请日：1989-08-28

申请人： William T. Stokes

发明人： William T. Stokes

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

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. Another feature of the calculator is an improved keyboard of relatively small domain size for each key, with a spacer grid on the back surface of the keyboard membrane panel overlay element, effective to provide pressure isolation of an active key from adjacent keys and also to prevent other pressures on the keyboard from causing mistaken entries. A further feature of the calculator is a protrusion or foot at each corner of the back of the calculator casing. Finally, the calculator in a preferred embodiment has a plurality of different background colors for different groups of the transparent function keys.

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。 计算器的塑料外壳在拐角处有一个或多个穿过外壳的小孔。 计算器的另一个特征是每个键具有相对小的域大小的改进的键盘，在键盘膜面板覆盖元件的后表面上具有间隔栅格，有效地提供活动键与相邻键的压力隔离，并且还防止 键盘上的其他压力导致错误输入。 计算器的另一个特征是在计算器外壳的后部的每个角落处的突起或脚。 最后，优选实施例中的计算器具有用于不同组的透明功能键的多种不同的背景颜色。

公开(公告)号：US5013148A

公开(公告)日：1991-05-07

申请号：US378979

申请日：1989-07-12

申请人： Jiro Ozeki

发明人： Jiro Ozeki

IPC分类号： G03B1/46 ,  G03B1/48 ,  G03B21/04 ,  G03B21/132 ,  G03B21/64

CPC分类号： G03B21/64 ,  G03B21/132 ,  Y10S353/03

摘要： Projector comprising a housing, a support frame formed with a carrying surface for carrying a flexible file sheet in which transparent materials are arranged in the form of a matrix longitudinally and transversely, light source device arranged in the housing at one side of the support frame, projecting lens device arranged at the other side of the support frame, the support frame being mounted on the housing for a reciprocating movement in a first direction, the support frame being provided with guide rails for movably carrying the file sheet in a second direction perpendicular to the first direction. The projector further comprises retaining device for retaining the file sheet onto the carrying surface. The retaining device is mounted on the support frame for slidable or rotatable movement relative to the file sheet so that the transparent material can be easily changed in the file sheet without focus readjustment.

摘要翻译： 投影仪包括壳体，支撑框架，形成有承载表面，用于承载灵活的文件片，其中透明材料纵向和横向以矩阵的形式布置，光源装置布置在支撑框架的一侧的壳体中， 投影透镜装置布置在支撑框架的另一侧，支撑框架安装在壳体上用于沿第一方向往复运动，支撑框架设置有导轨，用于沿垂直于第二方向的第二方向可移动地携带文件片 第一个方向。 投影仪还包括用于将文件片保持在承载表面上的保持装置。 保持装置安装在支撑框架上以相对于文件片材可滑动或可旋转运动，使得透明材料可以容易地在文件夹中改变而不进行聚焦重新调整。

公开(公告)号：US4953971A

公开(公告)日：1990-09-04

申请号：US258605

申请日：1988-10-17

申请人： Robert R. Highfill

发明人： Robert R. Highfill

IPC分类号： G03B21/132 ,  G03B21/134

CPC分类号： G03B21/132 ,  G03B21/134 ,  Y10S353/03 ,  Y10S353/05

摘要： An interactive image projection apparatus for the projection of computer generated images on a projection surface in cooperation with a light source and projection optics for projecting a beam of light from the light source onto the projection surface. The apparatus includes a substantially transparent image display device disposed in the beam of light and including means for receiving image-defining signals from a computer and producing an image based on the image-defining signals that is projected onto the projection surface in the beam of light. A touch screen, at least a portion of which is substantially transparent, is disposed in the beam of light between the image display device and the projection surface and includes means for generating a signal when touched for use as input information at the computer. Preferably, the touch screen is supported directly over the image display device. The signal from the screen may be used to modify the projected image to facilitate interaction in a convenient manner which promotes the interest and maintains the attention of persons viewing the image.

摘要翻译： 一种交互式图像投影装置，用于与光源和投影光学器件配合投影计算机产生的图像在投影表面上，用于将来自光源的光束投射到投影表面上。 该装置包括设置在光束中的基本透明的图像显示装置，并且包括用于从计算机接收图像定义信号的装置，并且基于投射到光束中的投影表面上的图像定义信号产生图像 。 其至少一部分基本上是透明的触摸屏设置在图像显示装置和投影表面之间的光束中，并且包括用于在触摸时产生用于计算机的输入信息的信号的装置。 优选地，触摸屏直接支撑在图像显示装置上。 来自屏幕的信号可以用于修改投影图像，以促进以方便的方式的交互，这促进了对观看图像的人的兴趣并保持观众的关注。

公开(公告)号：US4880303A

公开(公告)日：1989-11-14

申请号：US155202

申请日：1988-02-12

申请人： Peter-Hein Grunwald

发明人： Peter-Hein Grunwald

IPC分类号： G03B21/132

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： An overhead projector comprises a housing the upper side of which is closed by a transparent writing plate under which there is a Fresnel lens. A lamp in the housing is provided with a cold light reflector and a condenser lens for directing light upwardly through the Fresnel lens and writing plate. A projection head mounted above the writing plate on a support arm extending up from the rear side of the housing and comprising an objective lens and a deflection mirror directs the light received from the lamp through the Fresnel lens and writing plate onto a projection screen. A liquid crystal display in a frame hingedly mounted on the rear side of the housing can be swung between an operative position overlying, but spaced from the writing plate and an idle position up against the support arm where it is held by a magnet. The liquid crystal display is controlled by a computer disposed in the housing and fed from a common power supply for the lamp and a ventilating fan located in the housing for cooling the lamp, computer and liquid crystal display. The support arm is hinged so that it can be swung down to a travel position overlying the liquid crystal display and may be recessed on its forward side to accommodate the liquid crystal display.

摘要翻译： 高架投影仪包括壳体，其上侧由透明书写板封闭，在该底板下面有菲涅尔透镜。 壳体中的灯具有冷光反射器和用于将光向上引导通过菲涅耳透镜和书写板的聚光透镜。 安装在书写板上方的支撑臂上的投影头，该支撑臂从壳体的后侧向上延伸并且包括物镜和偏转镜，将从灯接收的光通过菲涅尔透镜和书写板引导到投影屏幕上。 铰链安装在壳体后侧的框架中的液晶显示器可以在覆盖但与书写板间隔开的操作位置和与支撑臂相对的空闲位置之间摆动，在该位置处由磁体保持。 液晶显示器由设置在壳体中的计算机控制，并从用于灯的公共电源供给，并且设置在壳体中的用于冷却灯，计算机和液晶显示器的通风扇。 支撑臂被铰接，使得其可以向下摆动到覆盖液晶显示器的行进位置，并且可以在其前侧凹入以容纳液晶显示器。

公开(公告)号：US4851924A

公开(公告)日：1989-07-25

申请号：US220171

申请日：1988-07-18

申请人： Takuma Nakamura ,  Yasuhiko Saka

发明人： Takuma Nakamura ,  Yasuhiko Saka

IPC分类号： B41J3/407 ,  B41M5/28 ,  G03B21/132 ,  H04N1/00

CPC分类号： H04N1/0035 ,  B41M5/282 ,  G03B21/132 ,  Y10S353/03

摘要： An overhead projector having scanning device for scanning an original image thereby generating electric signals corresponding to the original image, selecting device for selecting one of a thermochromic film and a thermographic paper, a first heating device for heating the film thereby erasing an image formed formerly in the film, a second heating device for heating the film in accordance with the electric signals transmitted from the scanning device to form an image corresponding to the original image in the film when the film is selected by the selecting device and for jheating the thermographic paper in accordance with the electric signals transmitted from the scanning device to print an image corresponding to the original image in the thermographic paper when the thermographic paper is selected by the selecting device, andprojecting device for projecting the image formed in the film on a given screen.

摘要翻译： 一种具有扫描装置的高架投影仪，用于扫描原始图像，从而产生对应于原始图像的电信号，用于选择热变色膜和热敏照相纸之一的选择装置，用于加热膜的第一加热装置，从而擦除先前形成的图像 该胶片是用于根据从扫描装置发送的电信号加热胶片的第二加热装置，以便当通过选择装置选择胶片时，形成与胶片中的原始图像相对应的图像，并且将热敏纸张加热 根据从扫描装置发送的电信号，当由选择装置选择热敏纸时，将与原图像对应的图像打印在热敏照相纸中;以及投影装置，用于将形成在胶片中的图像投影到给定屏幕上。

公开(公告)号：US4846570A

公开(公告)日：1989-07-11

申请号：US155298

申请日：1988-02-12

申请人： Nobuo Kanai

发明人： Nobuo Kanai

IPC分类号： G03B21/132

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： An overhead projector which has a stage for supporting an original thereon comprises an optical system for collecting light to the entrance pupil of a projection lens and a movable mirror for directing light from an illumination light source to an optical system.The movable mirror is movable with the movement of the projection lens parallel to the plane of the stage for placing an original thereon so that trapezoidal distortion and loss of focus which occur when the projection lens projects an image at an oblique angle are avoided. The position for the collection of the illumination light by the optical system is changed according to the movement of the projection lens, and illumination light is always collected at the position of the entrance pupil of the projection lens.

摘要翻译： 具有用于支撑原稿的台架的高架投影仪包括用于将光收集到投影透镜的入射光瞳的光学系统和用于将来自照明光源的光引导到光学系统的可移动镜。 可移动反射镜可随着投影透镜的移动平行于用于放置原稿的平面的运动而移动，从而避免了当投影透镜以倾斜角投影图像时发生的梯形失真和焦点损失。 通过光学系统收集照明光的位置根据投影透镜的移动而改变，并且总是在投影透镜的入射光瞳的位置收集照明光。

公开(公告)号：US4118114A

公开(公告)日：1978-10-03

申请号：US698116

申请日：1976-06-21

申请人： Raymond H. Anderson ,  Gregory S. Lewer

发明人： Raymond H. Anderson ,  Gregory S. Lewer

IPC分类号： G02B1/04 ,  G02B3/08 ,  G03B21/132 ,  G03B21/14

CPC分类号： G03B21/132 ,  G02B1/04 ,  G02B3/08 ,  Y10S353/03

摘要： An overhead projector that uses as a condensing lens a linear echelon lens structure comprising a combination of linear echelon lens elements between the light source and stage of the projector to minimize glare emanating from the condensing lens.

摘要翻译： 一种高架投影仪，其使用线性梯形透镜结构作为聚光透镜，其包括在投影仪的光源和舞台之间的线性梯形透镜元件的组合，以最小化从聚光透镜发出的眩光。

公开(公告)号：US4080052A

公开(公告)日：1978-03-21

申请号：US758988

申请日：1977-01-13

申请人： Robert E. Levin ,  Robert P. Bonazoli

发明人： Robert E. Levin ,  Robert P. Bonazoli

IPC分类号： G03B21/132 ,  G03B21/14

CPC分类号： G03B21/132 ,  Y10S353/03

摘要： An overhead projection system which includes a planar lens assembly having two concentrically-oriented condensing lenses. The outer lens has a greater focal length than the inner lens to receive light reflected from the system's reflector while the inner condensing lens receives direct lighting from the system's light source. Accordingly, the inner lens images the light source at the projection lens of the system and the outer lens images the virtual image of the light source.

摘要翻译： 一种架空投影系统，其包括具有两个同心取向的会聚透镜的平面透镜组件。 外透镜具有比内透镜更大的焦距以接收从系统的反射器反射的光，而内聚光透镜从系统的光源接收直接照明。 因此，内透镜在系统的投影透镜处对光源进行成像，外透镜成像光源的虚像。