Projector Overhead Lamp
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ELMO CX-350 Xenon 16mm projector
From Entertainment to Education: Video Projectors
There was a time when movie halls came to existence, people thronged around the movie halls just to get a glance of their favorite movie. Today time has changed and people have the resources to see their favorite movies at their home too. This revolution has been bought about by the projectors.
‘Projectors’ the term used for the devices that takes video or image signals and produce the particular video and images on the screen that is provided along with it to view the images produced. Since the day of coming projectors has become a major part of lot of important work, be it watching a movie, giving some educational notes or viewing certain images. There are two main types of projectors available the overhead projector and the video projector.
Even today lot of schools and colleges use the overhead projectors for giving some educational notes and even messages to the students. So what really are overhead projectors, basically many of us would have seen what overhead projector is, manufacturing wise speaking an overhead projector consist mainly of a bright shining lamp, the lamp is basically placed inside a box with a fan too attached to it in order to keep the lamp cool. The type of projector you are using determines the quality of image that is produced. Mainly the overhead projectors are used for producing images and viewing notes. These types of projectors are used in educational institutions like colleges and schools. The latest addition that has been done to the overhead projectors is the LCD display. This addition is due to the rise in the demand of LCD projector as they provide clearer image and view and quite handy to use.
The next are the LCD projectors, these are the modern innovations of the overhead projectors. LCD (liquid crystal display) use a colored display panel which is basically used in front of a bright shining lamp thus, producing the videos and images that are given it through the signals produced by the DVDs player, CDs player or the computers. These types of projectors are easily transportable because of the portable nature and light weight. These features have increased the demands of these Portable LCD projectors to a larger extent.
The main attention is given to the scalar while looking for a video projector. The best feature of any video projector can be attributed to the number of processors it uses while working. When you go in for any projector mainly the video projectors, always opt for the projectors that have the highest resolution power. The more is the resolution power more is the quality of images that are produced by the projector.
From entertainment to education projectors have done it all, they have played a major part in our lives. Many of us opt for these projectors at home; it is essential to check the functions and the quality that these projectors have. Always go for a reputed agency that provides these projectors search the net and choose the best that suits your demands.
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for more info please visit Portable LCD projectors and LCD Projectors UK
RELATED TO LENSES.................?
A teacher uses an overhead projector for showing slides in a classroom, but students complained that the image is too small. The teacher then enlarged the image by moving the projector away from the screen, but the image becomes blurred. The image would get clear again by
A. moving the lens closer to the slide.
B. moving the lens farther from the slide.
C. decreasing the amount of light in the room.
D. increasing the power of the projector lamp.
CAN SOMEONE PLEASE EXPLAIN??
it is the properties of a convex lens
F = focal point of lens
Do = object (slide) distance from the lens
if Do < F
the image is virtual upright located on the object side as in magnifying glass ( cannot be projected on the screen)
if Do = F no image
if Do > F
the image is real inverted located on the other side of the lens (on the screen), the fun part is to investigate the properties further
lets say lens radius R, such that R = 2 * F
if Do > R the image is smaller but blurred as distance increases
if Do = R the image is same size as the object but sharp (focused)
if Do < R the image is bigger but blurred as distance decreases
God will not allowed you to have a sharp and bigger size image at the same time
after the teacher moves the projector away from the screen [Do < R] the image becomes larger but also becoming less sharp, so the slide has to be moved farther away from the lens
