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Precautions while using Overhead Projectors
During most corporate meets, business owners hire projectors from reliable, take proper precautions
1. Overhead projectors
Business owners often use overhead projectors to present ideas visually during presentations. Overhead projectors display images onto a screen via a bright lamp, a large fresnel lens, a smaller objective lens and a mirror. Although overhead projector designs vary by manufacturer, design elements shared across manufacturers can pose certain dangers to you and your audience.
2. Function
An overhead projector is a metal box with mirrors, lenses and a bright light. The bright light from a bulb reflects on the Fresnel lens inside the overhead. The light then bounces to a reflecting mirror under a stage where you set the overhead transparency. This image is in reverse form. A convex mirror then reflects an enlarged image with the proper orientation from the overhead transparency to a screen behind the speaker and the overhead.
3. Types
The three types of overhead projectors are the transmissive, reflective and opaque. The transmissive overhead projector is the most commonly used type. It relies on the Fresnel lens to reflect the image from the overhead transparency to the screen. Reflective overhead projectors work from an overhead light source rather than one underneath the presenters hand as in a transmissive overhead projector. This type of overhead projector gets the most use in large auditoriums. An opaque overhead projector allows you to show three dimensional objects as well as overhead transparencies.
4. Precautions
Business owners can reduce these dangers by using overhead projectors per manufacturer safety rules. For example, if you have a child who spends time with you at your business, don t allow her to play or stand near the projector at any time whether it s in use or not. Position the projector close to an electrical socket, or use bright yellow or red reflective tape to alert others of the cord s position. Additionally, move seats away from the projector. If your mouth or throat gets dry when speaking, place a drink several feet from the projector, excuse yourself during the presentation and walk a couple of steps to your drink when you need it.
5. Toxins
Given that an overhead projector can overheat enough to make parts melt or catch fire, another danger of using this equipment is potential exposure to toxic smoke. When certain parts, such as plastic, metal or fire retardant chemicals heat up or burn in equipment, toxic chemicals and heavy metals enter the air. Even with adequate indoor ventilation, you might experience short term or long term health issues including skin or eye irritation, upper respiratory problems, headache, nausea, fatigue or cancer, or exacerbation of pre existing issues like asthma.


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