![]() These projectors can project only one slide at a time. ★ Single slide projectors have only one holder slot that is built into a compact case, which contains the bulb and lenses. Two or more slides can be put in and they can be projected simultaneously. Every ring can be advanced, put in independently, and can also be locked together. ★ Dual slide projectors consist of a number of holder trays that are made up of an inner and outer ring. The trays can be horizontal or upright, though horizontal trays are mostly preferred. A stepper motor rotates these trays, and another corresponding system drops each slide in front of the light bulb to be projected. ★ Carousel slide projectors have circular trays, which consist of 20 to 140 slide holders. Types of Slide Projectors and their Operating Tips Low cost paper prints, digital cameras, DVD media, video display monitors, and digital projectors have replaced the slide projectors to a large extent. It was a time when family members and friends would gather just to view slide shows of their photographs. In the 1950s and 1960s, they were a common form of entertainment. This form of projection also helps in preventing the interruption of the audience in the light stream or bumping into the projector. The other way of doing it, would be to project the image onto a translucent “rear projection” screen, which is often used for continuous and automatic display for close viewing. Light passes through the transparent slide and lenses, as a result of which, the visible image is enlarged and projected onto a perpendicular flat screen, and the audience can view its reflection. The glass transmits visible wavelengths but it absorbs infrared. A reflector and “condensing” lens that directs the light to the slideĪ flat piece of heat-absorbing glass is put in the light path between the condensing lens and the slide, so that the slide is not damaged.A fan-cooled electric light bulb or any other light source.It consists of the following four, main parts: Read further to know more about this brilliant invention.Ī slide projector is a device used to view photographic slides. It allows you to watch your photographs on a big screen, and makes the experience more enjoyable and entertaining. ![]() A slide projector lets you relive your memories in style.
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