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年龄不是距离 13岁少年获投影技术专利

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发表于 2009-6-10 10:00:20 | 显示全部楼层 |阅读模式
【IT168 资讯】有人说过,“该被发明的东西,已经都被发明出来了”。但这句话目前已经被一个美国13岁的少年打破了。
  

  示意图

  一位名叫David Baker的美国13岁男孩,日前已经凭借其独创的光线投射系统获得了专利认证。通过这套系统,可以制造出外形如钢笔状的微型投影机。这项技术通过将3套RGB激光光源相结合,投射出最终成像的光线。当光线通过镜头投射出去时,它们只是一个个的像素点,而这套系统是通过镜头的来回移动实现整幅画面的输出。这个镜头移动的过程频率为每秒30次,如此高速的移动使得通过激光技术的投影机展现的不再是一个个像素点,而是一幅完整的图像。
  但创意好归好,转到实际应用方面还是有不少的问题。首先最大的问题就是,如此高频率的镜头动作,投影机寿命到底能坚持多久?其次目前激光技术在投影机领域还处于非常初级的发展阶段,究其原因还是因为只能投射出单一像素点,根本无法形成一副图像。采用这项技术之后的实际效果到底如何,还有待时间的考验。

http://projector.it168.com/a2009/0604/583/000000583202.shtml
 楼主| 发表于 2009-6-10 10:02:00 | 显示全部楼层
激光投影具有色纯度高、色域大,尺寸灵活可变和更安全环保三大优点。


但是目前还受到绿激光模块以及光学调制方面的影响而处于研究阶段
但是由于自身的优势
必将在未来的投影显示领域发挥着巨大的作用
 楼主| 发表于 2009-6-10 10:04:56 | 显示全部楼层
目前固态绿激光器主要通过倍频的方式从其他波长得到
因此限制了其应用
 楼主| 发表于 2009-6-10 10:05:36 | 显示全部楼层
激光投影机没有红外线以及紫外线的困扰,不仅仅减除了紫外、红外过滤装置,同时更洁净的输出结果,让用户更为愿意使用。
 楼主| 发表于 2009-6-10 10:06:26 | 显示全部楼层
激光投影机都不需要镜头,这大大降低了投影机的成本。
而且不存在聚焦问题
不会有投影模糊的现象
 楼主| 发表于 2009-6-10 10:09:11 | 显示全部楼层
三洋的激光投影机采用的是与Microvision Show WX诶四的三原色激光光源,由于技术的进步,三洋表示其产品可支持全高清(1920×1080)分辨率,亮度达到惊人的7000 ANSI流明,而且它可以从不到150英寸的距离投射出100英寸的画面。

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 楼主| 发表于 2009-6-10 10:16:29 | 显示全部楼层
1、        光源本身的电光转换效率低,但是由于产生的光本身的利用效率高,因此整体来说,效率要高于目前普遍使用的普通光源。正是基于这个原因,很低的流明输出便可以得到较好的显示效果。
 楼主| 发表于 2009-6-10 10:18:35 | 显示全部楼层
其他的优势以后慢慢收集呈现
:lol
 楼主| 发表于 2009-6-10 10:18:39 | 显示全部楼层
不过缺点也是存在的
如下几个:
1、        单就“光”的利用来说,激光一定要比通常的光源好,尤其是相干特性优良,能够达到屏幕的光线比率要比通常的光源高得多。另一方面,固态激光光源尚存在发光 效率太低的问题,无法与现在的一些发光技术相提并论,而且因为安全问题无法把功率无限制提高,在一定程度上限制了它的应用范围。因此阵列式的使用更加现实。
2、        因为光线的波长是固定的三种,所以实现的颜色层次更好、颜色饱和度更高,这是其他光源所无法想像的。另一方面,激光的频率是固定的,在光线到达屏幕的时候,反射回来的光线会改变相位,因而可能导致射入与射出光线之间的干扰,可能加强也可能减弱。这可能让敏感的用户看到亮点或者暗点,这是激光无法改变的现实状态,也是激光作为光源的最大弱点之一。
其实还有安全问题
不过个人认为阵列小概率激光作为光源会更有市场潜力
 楼主| 发表于 2009-6-10 10:54:17 | 显示全部楼层

What is a Laser Projector?

The theater laser projector was built around a Spectra-Physics model 164 ion laser back in the early 1970s. Designers realized that special output mirrors could be used to allow lasing to occur simultaneously at red, yellow, green, and blue wavelengths. The raw beam, a beam that appeared white to the eye, was shot with a high refractive-index prism, which achieved a separation of about two degrees between blue and red. It was with this technology that the laser projector was created.

The original laser projection system was put into an enclosed relay rack cabinet of approximately 2 1/2 feet (about 0.76 meters) square by 6 feet (about 1.83 meters) tall. Needless to say, the first laser projector was huge as compared to today’s laser projector. A ½ inch (1.27 centimeters) thick aluminum plate sectioned off the cabinet of the original laser projector. The laser head, which was 4 feet (about 1.22 meters) long, was mounted vertically on one side of the plate. The laser head pointed downward.

The laser beam of the laser projector was then reflected through a hole to the opposite side of the plate. The projector's optical equipment was mounted on that side. The white laser beam was refracted into its component colors by a prism, which is a piece of glass or quartz-like material that reflected the beams. The four individual colored beams were then reflected through four acousto-optic modulators (AOMs), which forced the intensity of the individual beams to be varied electronically. This varied the frequencies from DC to more than 5 kHz depending on the need.

The very first image produced by a laser projector was not well defined. With the changes that have been made to the basic laser projector over the years, however, the laser projector is now the heart of any graphics system.

Most full-color projectors use polychromatic AOMs (PCAOMs). These control the blanking and color selection in the laser projector. They are usually used with what is referred to as "white-light" beams to create full-color graphics. The new type of laser projector is capable of doing things that the original creators never fathomed.

With this type of laser projector, a white-light laser beam enters the PCAOM crystal from the right, while a radio-frequency (RF) signal is injected from the top. The RF signal sets up a diffraction pattern, which acts as a prism.

A laser projector is basically sound and light playing together. The result is two beams exiting on the left and becoming the desired color. There is also a "waste" beam containing all of the colors except the desired color. Together, these light beams can create any image desired.
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