Telesure Lane

Auto & General Park

Telesure Lane

Randburg

2055

Gauteng

South Africa

-25.9803685

28.0138512

59 4 Av

Linden Place

4 Av

Johannesburg

2195

Gauteng

South Africa

-26.14101

27.99213

15 Alexandra St

Alexandra St

Randburg

2194

Gauteng

South Africa

-26.18639

28.05165

5 Second Rd

Fountain Grove Suite 7

Second Rd

Johannesburg

2196

Gauteng

South Africa

-26.14845

28.0429

18 Napier Rd

Napier Rd

Johannesburg

2109

Gauteng

South Africa

-26.18284

28.0146

Overhead projector

An overhead projector is a projector that throws an enlarged image of a transparency onto a surface above and behind the person using it. Images are redirected by an overhead mirror.

Overhead projectors were largely used both in offices, schools and churches before other technologies were introduced that led to their decrease in use.
Overhead projectors use either of the three optics. Namely direct optics, folded optics and reflected light optics. All these serve the same purpose that is to allow the projector to project an image on a surface, they however vary in technique.

A direct optics projector puts the optics and light source in a straight line, allowing the image to be reflected from a mirror onto the screen. Such an overhead projector is very common and affordable. It however does have its cons such as getting hot during usage. Folded optics allow one to put the mirror in between the lamp and lens, the light source is surrounded by an elliptical faceted reflector. Last but not least, a reflected light optic makes use of a lens that is specially designed and backed up by a mirror. Light is directed towards the lens and travels through it to the main projective lens

Overhead projectors are quite useful and are easy to use as compare to other digital projector versions that have been introduced over the years. To find out more about overhead projectors, browse our Yellow Pages listings.

Overhead projector

An overhead projector is a projector that throws an enlarged image of a transparency onto a surface above and behind the person using it. Images are redirected by an overhead mirror.

Overhead projectors were largely used both in offices, schools and churches before other technologies were introduced that led to their decrease in use.
Overhead projectors use either of the three optics. Namely direct optics, folded optics and reflected light optics. All these serve the same purpose that is to allow the projector to project an image on a surface, they however vary in technique.

A direct optics projector puts the optics and light source in a straight line, allowing the image to be reflected from a mirror onto the screen. Such an overhead projector is very common and affordable. It however does have its cons such as getting hot during usage. Folded optics allow one to put the mirror in between the lamp and lens, the light source is surrounded by an elliptical faceted reflector. Last but not least, a reflected light optic makes use of a lens that is specially designed and backed up by a mirror. Light is directed towards the lens and travels through it to the main projective lens

Overhead projectors are quite useful and are easy to use as compare to other digital projector versions that have been introduced over the years. To find out more about overhead projectors, browse our Yellow Pages listings.

...Read More