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公开(公告)号：US4548480A
公开(公告)日：1985-10-22
申请号：US459242
申请日：1983-01-19
CPC分类号： G02B13/16
摘要： A projection lens apparatus for projecting an image from a CRT onto a remote screen. The lens apparatus is basically a Petzval type for a large aperture ratio and comprises three lenses. The first lens is a plastic lens having at least one aspherical surface and the third lens has a bi-aspherical surface. To reduce the thermal drift of the focal position, the second lens is a glass lens, having relatively largely positive optical power.
摘要翻译： 一种用于将来自CRT的图像投影到远程屏幕上的投影透镜装置。 透镜装置基本上是用于大孔径比的Petzval型，并且包括三个透镜。 第一透镜是具有至少一个非球面的塑料透镜，第三透镜具有双非球面。 为了减少焦点位置的热漂移，第二透镜是玻璃透镜，具有较大的正光学功率。
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公开(公告)号：US4810076A
公开(公告)日：1989-03-07
申请号：US866585
申请日：1986-05-23
CPC分类号： G02B5/005
摘要： A selective shading device has a number of shading plates or planar members and a supporting body that holds the plates or planar members in such a manner that they are arrranged radially with respect to an optical axis. The device blocks sagittal bundles of rays. A preferred example of the supporting body is a cylindrical frame that holds the shading plates perpendicularly to the inner surface thereof. Alternatively, the shading planar members are formed within a lens element along the edge thereof.
摘要翻译： 选择性遮光装置具有多个遮光板或平面构件以及支撑体，其以相对于光轴径向布置的方式保持板或平面构件。 装置阻挡矢状束束。 支撑体的优选实例是将遮光板垂直于其内表面保持的圆柱形框架。 或者，阴影平面构件沿其边缘形成在透镜元件内。
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公开(公告)号：US4704009A
公开(公告)日：1987-11-03
申请号：US805385
申请日：1985-12-04
摘要： A projection lens having a large aperture ratio has 3 units for projecting an enlargemen of an image appearing on a CRT onto a screen. The first unit from the screen has a negative power so that the entrance pupil is moved toward the screen to thereby improve off-axis vignetting factor. The second unit consists of two positive power lens elements so that the positive power of the entire system is shared by the second unit and the temperature characteristic is improved by using a positive power glass lens element as one of the two positive power lens elements. The third unit has a negative power to correct curvature of field.
摘要翻译： 具有大孔径比的投影透镜具有3个单元，用于将出现在CRT上的图像的放大图像投影到屏幕上。 来自屏幕的第一单元具有负功率，使得入射光瞳向屏幕移动，从而改善离轴渐晕因子。 第二单元由两个正功率透镜元件组成，使得整个系统的正功率由第二单元共享，并且通过使用正功率玻璃透镜元件作为两个正功率透镜元件之一来提高温度特性。 第三单元具有校正曲率的负电力。
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公开(公告)号：US4690515A
公开(公告)日：1987-09-01
申请号：US802341
申请日：1985-11-25
摘要： A compact projection lens for projecting an enlargement of an image appearing on a cathode ray tube (CRT) onto the screen. The projection lens has a first lens having a positive optical power and at least one aspheric surface, surface of the first lens that faces the screen being convex, a second lens having bi-convex surfaces and a positive optical power, and a third lens having a negative optical power and an aspheric concave surface facing the second lens. The focal length f.sub.1 of the first lens and the focal length f.sub.2 of the second lens are selected for satisfying a condition of0.55
摘要翻译： 一种紧凑的投影透镜，用于将出现在阴极射线管（CRT）上的图像放大到屏幕上。 投影透镜具有具有正光焦度的第一透镜和面向屏幕的第一透镜的至少一个非球面表面，具有双凸表面和正光焦度的第二透镜，以及第三透镜，具有 负光学功率和面对第二透镜的非球面凹面。 选择第一透镜的焦距f1和第二透镜的焦距f2以满足0.55
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公开(公告)号：US4792218A
公开(公告)日：1988-12-20
申请号：US139451
申请日：1987-12-30
摘要： A high definition projection lens for projecting on a screen an enlargement of an image appearing on a high resolution CRT is disclosed. The projection lens comprises a first lens having a positive optical power and a convex surface facing the screen, a meniscus second lens having a positive optical power, a third lens having bi-concave surfaces and a negative optical power, a fourth lens having a positive optical power, a fifth lens having bi-convex surfaces and a positive optical power, and a sixth lens having a negative power and an aspheric concave surface facing the fifth lens.
摘要翻译： 公开了一种用于在屏幕上投影出现在高分辨率CRT上的图像的放大的高分辨率投影透镜。 投影透镜包括具有正光焦度和面向屏幕的凸面的第一透镜，具有正光焦度的弯液面第二透镜，具有双凹面和负光焦度的第三透镜，具有正光焦度的第四透镜 光功率，具有双凸表面和正光焦度的第五透镜，以及具有负功率的第六透镜和面向第五透镜的非球面凹面。
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公开(公告)号：US4453178A
公开(公告)日：1984-06-05
申请号：US331471
申请日：1981-12-16
摘要： A projection television apparatus having a retrofocus type projection lens system which has a sufficiently long back focus, a small F number and a large distortion. The lens system is constructed with five components and five lenses and comprises a first lens which is a negative meniscus lens that has at its screen side a convex surface, a second lens which is a biconvex lens, a third lens which is a biconcave lens, a fourth lens which is a positive lens, and a fifth lens which is a biconvex lens, and which is defined by the following four conditions, i.e.1.4f
摘要翻译： 一种投影电视装置，具有后焦点足够长，F值小，大失真等的后焦点型投影透镜系统。 透镜系统由五个部件和五个透镜构成，并且包括：第一透镜，其是在其屏幕侧具有凸面的负弯月形透镜，作为双凸透镜的第二透镜，作为双凹透镜的第三透镜， 作为正透镜的第四透镜和作为双凸透镜的第五透镜，其由以下四个条件限定，即：1.4f <| f1 <1.9f（i）0.35f
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7.发明授权Single optical lense with diffraction limit converging capability and wide field angle 失效具有衍射极限收敛能力和宽视场角的单光学透镜
公开(公告)号：US4842388A
公开(公告)日：1989-06-27
申请号：US60618
申请日：1987-06-11
CPC分类号： G02B3/04
摘要： A single lens having first and second aspherical surfaces each having a positive power is usable for, an objective lens of an optical pickup for an optical recording medium. The lens satisfies the following conditions:0.1
摘要翻译： 具有正功率的第一和第二非球面的单透镜可用于光学记录介质的光学拾取器的物镜。 透镜满足以下条件：0.1 <| m| <0.5 0.9 <（d / f）<1.2其中m表示放大率; d表示透镜的厚度; f表示透镜的焦距。
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公开(公告)号：US4400722A
公开(公告)日：1983-08-23
申请号：US261136
申请日：1981-05-04
CPC分类号： H04N9/31
摘要： A projection television apparatus which has three monochromatic cathode-ray tubes, two type of dichroic mirrors, and a lens. Red, green and blue images from the three tubes are combined into the color image by the two types of dichroic mirrors and the resulting image is enlarged and projected on the screen by one lens. The two types of dichroic mirrors are crossed at a right angle in the shape of an "X". Each type of dichroic mirror is split in two through the line of intersection and the two parts of the respective dichroic mirrors of each type have different transmission characteristics, so that color shading is improved.
摘要翻译： 一种具有三个单色阴极射线管，两种分色镜和透镜的投影电视设备。 来自三个管的红色，绿色和蓝色图像通过两种分色镜组合成彩色图像，并且所得到的图像被放大并通过一个透镜投影在屏幕上。 两种分色镜以“X”的形状以直角交叉。 每种类型的分色镜通过交叉线分成两部分，每种分色镜的两部分具有不同的传输特性，从而提高了色调。
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9.发明授权Apparatus for high-density minimal crosstalk recording and reproducing of terminance and chrominance signals using a magnetic tape 失效用于使用磁带记录和再现终端和色度信号的高密度最小串扰的装置
公开(公告)号：US4811119A
公开(公告)日：1989-03-07
申请号：US890347
申请日：1986-07-30
摘要： A magnetic tape recording/reproducing apparatus for recording video signals on a magnetic tape without providing a guard band between each two adjacent signal tracks. The apparatus comprises a first switching circuit for exchanging 2-channel component signals every nH period to obtain two combined signals each composed of the 2-channel signals which alternate every nH period, two modulators for modulating the two combined signals, a head section having two pairs of rotarty magnetic heads for recording the modulated signals on the magnetic tape so that each two adjacent blocks contain a same channel component signal and for reproducing the recorded signals from the magnetic tape, two demodulators for demodulating the reproduced signals, and a second switching circuit for exchanging the demodulated signals every nH to obtain the 2-channel component signals. With this arrangement, the recording density is remarkably increased and the cross talk interference hardly occur.
摘要翻译： 一种用于在磁带上记录视频信号而不在每个两个相邻信号轨道之间提供保护带的磁带记录/再现装置。 该装置包括用于每nH个周期交换2信道分量信号的第一切换电路，以获得两个组合信号，每个组合信号由每nH周期交替的2信道信号组成，两个用于调制两个组合信号的调制器， 用于将调制信号记录在磁带上的两对旋转磁头，使得每两个相邻的块包含相同的信道分量信号，并且用于从磁带再现记录的信号，用于解调再生信号的两个解调器和第二切换电路 用于每nH交换解调信号以获得2信道分量信号。 利用这种布置，记录密度显着增加，并且几乎不发生串扰干扰。
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公开(公告)号：US4621292A
公开(公告)日：1986-11-04
申请号：US661326
申请日：1984-10-16
CPC分类号： G01S17/48 , G02B7/32 , G03B21/53 , H04N5/23212
摘要： An automatic focusing device for a video camera includes a projector for projecting an infrared ray used for measuring distances and a converging lens for focusing reflected infrared ray light from an object whose distance is to be measured. A light spot detector and a computer are provided for determining whether the video camera is in focus. A lens encoder is utilized to determine the position of a focusing lens and a lens driving unit moves the position of a photographic lens used for photographing the object forwardly or backwardly in dependence upon outputs from the lens encoder and computer so as to automatically focus the video camera in response to the infrared rays reflected from the object to be photographed.
摘要翻译： 用于摄像机的自动聚焦装置包括投影用于测量距离的红外线的投影仪和用于聚焦来自待测距离的物体的反射红外线光的会聚透镜。 提供光点检测器和计算机用于确定摄像机是否处于焦点。 利用透镜编码器来确定聚焦透镜的位置，并且透镜驱动单元根据来自透镜编码器和计算机的输出将用于拍摄物体的摄影镜头的位置向前或向后移动，以便自动对焦视频 照相机响应于要拍摄的物体反射的红外线。
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