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Manufacturers : Presentation equipment : Overhead projectors

Overhead projectors are devices which produce magnified images on a screen or wall of indicia-bearing transparencies, typically clear plastic sheets including textual and/or graphical information. An overhead projector is used to project an enlarged image recorded on a film onto a projection screen. An verhead projector projects enlarged images onto a screen from a transparent original such as a transparency or a liquid crystal panel. Overhead projectors are often used on conferences, lectures and educational or presentation meetings to project images and drawings recorded on transparent sheet materials, such as chart films, on a remote screen standing vertically and located remote from the overhead projector. An overhead projector generally has a structure in which an image projection sheet on which an image for projection is formed is placed on a stage, the image on the image projection sheet is enlargedly projected on a screen through a projection lens by the light emanating from a light source illuminating the image projection sheet. An verhead projector is provided with a projection lens for projecting images onto a screen from a transparent original, and a reflection mirror for reflecting the light from a light source toward the screen. A Fresnel lens is commonly disposed inside the stage for converging light from the light source on the projection lens. Genarally, there are two types of overhead projectors differing in position of the light source: the reflection type and the light transmission type. Transmissive overhead projectors are generally comprised of a base having a transparent stage area, a light source inside the base, a projection head mounted above the stage, and a condensing lens system located near the stage for directing the light towards the projector head. Transmissive projectors have the light source below the stage and an overhead arm carrying a projection lens and a mirror. Light is focused and transmitted through the transparency on the stage toward the projection lens which is located by the arm over the stage and reflected by the mirror. The light source of the light transmission type is arranged beneath the stage, on which a Fresnel lens is placed to support the original material. Reflective projectors carry the light source in the overhead arm and have a reflective surface below the stage. Light shines down onto the stage and is reflected back up through the material which is placed on the stage. The light source of the reflection type is arranged in a unit incorporating the projector head, and the stage has a fresnel mirror that supports the original material.


Listings on Presentation equipment : Overhead projectors

  • ACCO Brands Corporation
    Supplier of branded office products, including staplers, shredders, punches and trimmers, sheet protectors, report covers, and binding and laminating machines and supplies, white boards, easels, overhead projectors, transparencies and screens, binders, filing systems, storage boxes, labels, clips and fasteners, and accounting supplies, mice, trackballs, keyboards, computer security devices and mobile accessories, planners and calendars. USA.

    http://www.accobrands.com
  • Opel Instruments Pvt. Ltd.
    Manufacturer of automatic slide projectors, over head projectors, DLP and LCD projectors, scrolling displays, OHP trollies, and OHP accesories. India.

    http://www.opel-instruments.com
  • Ricoh Elemex Corporation
    Manufacturer of sorters, staplers, document feeders, image scanners, overhead projectors, electric whiteboards and multimedia boards, atch movements, puppet robots, multipurpose robots, gas leakage alarm systems, intelligent gas meters, remote-reading systems for water meters, alkaline-ionized water apparatuses, oral irrigators, smoke purifiers, air purifiers and scalp purifiers. Japan.

    http://www.ricohelemex.co.jp
  • Vega International
    Manufacturer of projection systems and projection optics, including overhead projectors (transmissive desktop, transmissive portable, reflective portable), opaque projectors, optical elements and projection lenses for AV equipment, and conference room furniture. Slovenija.

    http://www.vega.si

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