Today's LEDs have reflector cups and focusing optics to focus and collimate their output.

今天的LED让反射杯和焦点的光学来焦点和校准他们的输出。

youdao

Dynamic focus voltage error of projection display system was studied in this article. Parabola dynamic focus method, projection tube shape and optics processing were analyzed.

从投影显示系统典型的动态聚焦方法与投影管特殊的荧光屏结构以及光学处理等方面对投影显示系统的动态聚焦电压误差进行研究。

youdao

It is the focus to get eigen equation of all kinds cross section waveguide in guide wave optics.

求解各类截面波导的本征方程，一直是导波光学研究的焦点问题。

youdao

We've been generally unimpressed with the latest round of basic point-and-shoots, including those from Samsung's mid-range Smart series, but we do tend to take heed whenever a manufacturer opts to focus on optics rather than bumping up the megapixel count to boost sticker appeal.

ENGADGET: Samsung EX2F point-and-shoot with f/1.4 lens hands-on (video)

Shortly after we caught wind of Android "consideration" within Samsung's camera division, a report surfaced that implied a change in course for the Galaxy giant -- the Korean company was ramping up mirrorless camera production at the cost of scaling back point-and-shoots, and the move appeared to represent a general shift away from compacts with a heavier focus on improving optics in smartphones.

ENGADGET: Editorial: Android cameras -- could Samsung's Galaxy gamble save the point-and-shoot industry?

The small size of the LED light chip allows another advantage arising from the physics of optics: Engineers can employ collaterally small lenses making it possible to efficiently extract, direct and focus the lumens, achieving useful illumination with far fewer lumens--and far less energy--wasted.

FORBES: The LED Illumination Revolution