describe the parts of overhead projector?
Answers
- Lamp and Reflector - The lamp is the light source, and it is found on the base (box) of the overhead projector. The reflector is placed being the lamp, so that it can direct the light forward toward a mirror. ... Projection Stage -This is a glass surface where transparencies are placed to be projected.
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Answer:Parts of an OHP
This image to the left is a detailed diagram of the major parts of an overhead projector. To the right, are all of the numbered parts that correspond with the diagram of the overhead projector (left).
Lamp and Reflector - The lamp is the light source, and it is found on the base (box) of the overhead projector. The reflector is placed being the lamp, so that it can direct the light forward toward a mirror. The reflector is key because it prevents light from being spread inside the base. If there wasn't a reflector, the image being projected would be very dim. The condenser is used to focus or condense the light onto the mirror, it is positioned between the lamp and the mirror in the base.
Blower - It is important to have a cooling fan because the base unit produces a large amount of heat, and the overhead projector requires a fan to prevent it from blowing out. An electric motor powers the blower, and attached to the motor is the fan that releases cool air within the base of the unit.
Base Mirror - A mirror can be found in the base unit, which is at an approximate angle of 45 degrees. This mirror is there to change the angle of the light produced by the lamp and reflector from its original horizontal direction. Then light is reflected and directed upward by this mirror through the projector's stage.
Projection Stage -This is a glass surface where transparencies are placed to be projected. The projection stage is also where the Fresnel lens are placed to focus and magnify the image upward. The Fresnel lens have a unique/fuzzy appearance to it because the surface of the Fresnel lens is made of concentric rings.
Upper Section - Above the stage, there are more parts that consist of a focusing knob, an objective lens that admits light sent through the Fresnel lens and another mirror to guide the image ahead onto the wall/screen. the focus knob is used to focus image or written material by moving the upper section
up or down.
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