![]() ![]() Electronics components - capacitors, resistors, etc.Fasteners - lots of nice little screws and washers.Mirror – Hinged for adjustment, there's an inside m and an external mirror reverses the projected image so it appears properly to viewers on the wall or screen.Lens - Between the lamp and the mirror in the base of the unit is a light condenser –an internal lens through which the lamp projects light to the transparency plate above.Magnifier – above the Fresnel lens base, on pivoting, adjustable arm, is big round magnifying lens through which the projected transparency image passes to the screen or wall.How to Create a Transparency for a Projector. Heat sinks - a couple of them in this case, in addition to the fan Technically, only one type of projection equipment transmissive qualifies as overhead projection.Fan – The lamp gets really hot, so a small fan keeps the who thing cool.Fresnel Lens - This lens focuses the light into a cone shape, projecting the image on the transparency onto the magnifier and mirror above it and then to the screen clearly.The Fresnel lens on which the transparency is placed is used to redirect most of the light striking the image into a cone shape towards the focusing lens.There are two bulbs because they burn our quickly, usually within 100 hours, and the second bulb is intended to act as a spare, moved into place with a simple twist of a knob. Lamp and Reflector- A pair of high intensity bulbs sit inside the big plastic base unit of the overhead projector, situated inside a reflector to direct the light forward toward a mirror. ![]() Overhead projectors are pretty straightforward devices, consisting of a set of mirrors, lenses and magnifier, a bulb in a reflective setting (with a spare bulb, in this case), a fan to keep the whole thing cool and usually a pivoting or extending arm to adjust the mirror and magnifier, plus the electronics for the whole thing. OHP Film Overhead Projector Film - 8.5x11 for Inkjet Printer only Transparency Film 30 Sheets Uinkit OVERHEAD PROJECTOR FILM: Make teaching easier thanks. Overhead projectors use a Fresnel lens and mirrors to project a magnified image from a transparent film placed on a clear platform onto a wall or screen. Overhead Projector Transparencies McMaster-Carr (630) 833-0300 Width 8 1/2' 9' 11' 12' 18' 24' 27' 36' 40' 42' 48' 50' 54' Length 11' 1 ft. ![]()
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