Gadget Review: Office Overhead Projectors
Office overhead projectors have become instrumental in the success of lectures and presentations during seminars, conferences; business meetings and even in classrooms. Alongside slide projectors are visual aids that present ideas more legibly by projecting it on a large screen to capture the attention of a wider audience.
The office overhead projector was initially used by the United States Armed Forces, particularly during the waning days of the Second World War. And corporate offices, schools and related entities caught on after the War, making it a potent tool during presentations.
How it Works?
An office overhead projector is typically like a large box containing a very powerful lamp (usually halogen lamp) coupled with a fan. Since the lamp generates heat during use, the fan obviously is designed to cool and prevent the lamp from burning out quickly.
The box is outfitted with Fresnel lenses (similar to those used in lighthouses) that collimates the light emitted off by the lamp. Transparencies from usual office supplies are placed directly over the Fresnel lens. As light shines through, light travels through the lens and into the transparencies. It is then directed towards a mirror that redirects the light forward into the large screen located on the wall above the box.
To aid in the accurate redirection of the collimated light, a long arm with a mirror and lens is installed on top of the box. This extra arm is responsible for focusing the light and directing it forward towards the overhead screen. Due to the design setup, the mirror permits both the presenter and the audience to clearly see the image displayed on the screen. Moreover, the height of the mirror on top of the box can be adjusted, not only to focus the image but also to project a larger or smaller image, depending entirely on the distance of the screen to the projector.
Overhead Projector versus Slide Projector
The popularity of the overhead projector zoomed to prominence with the streamlined use of inkjet and laser printers. Transparencies can now be printed easily in offices adding convenience to presentations. Slide projectors on the other hand are entirely different, instead of office printed transparencies, photographic film slides are used. So, when used during presentations, a lot of effort normally goes with the preparation and search for studios that develop photographic films. These films are inserted into the cavities of the carousel type or single and dual type slide projector.
While both the office overhead projectors and slide projectors provide the needed boost during presentations, the overhead type offers better advantages in the preparation of projected materials that can come from usual office supplies and printed inside offices.
The office overhead projector was initially used by the United States Armed Forces, particularly during the waning days of the Second World War. And corporate offices, schools and related entities caught on after the War, making it a potent tool during presentations.
How it Works?
An office overhead projector is typically like a large box containing a very powerful lamp (usually halogen lamp) coupled with a fan. Since the lamp generates heat during use, the fan obviously is designed to cool and prevent the lamp from burning out quickly.
The box is outfitted with Fresnel lenses (similar to those used in lighthouses) that collimates the light emitted off by the lamp. Transparencies from usual office supplies are placed directly over the Fresnel lens. As light shines through, light travels through the lens and into the transparencies. It is then directed towards a mirror that redirects the light forward into the large screen located on the wall above the box.
To aid in the accurate redirection of the collimated light, a long arm with a mirror and lens is installed on top of the box. This extra arm is responsible for focusing the light and directing it forward towards the overhead screen. Due to the design setup, the mirror permits both the presenter and the audience to clearly see the image displayed on the screen. Moreover, the height of the mirror on top of the box can be adjusted, not only to focus the image but also to project a larger or smaller image, depending entirely on the distance of the screen to the projector.
Overhead Projector versus Slide Projector
The popularity of the overhead projector zoomed to prominence with the streamlined use of inkjet and laser printers. Transparencies can now be printed easily in offices adding convenience to presentations. Slide projectors on the other hand are entirely different, instead of office printed transparencies, photographic film slides are used. So, when used during presentations, a lot of effort normally goes with the preparation and search for studios that develop photographic films. These films are inserted into the cavities of the carousel type or single and dual type slide projector.
While both the office overhead projectors and slide projectors provide the needed boost during presentations, the overhead type offers better advantages in the preparation of projected materials that can come from usual office supplies and printed inside offices.
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