![]() The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. Therefore, the transparency is placed face up (toward the mirror and focusing lens), in contrast with a 35mm slide projector or film projector (which lack such a mirror) where the slide's image is non-reversed on the side opposite the focusing lens.Ī related invention for enlarging transparent images is the solar camera. That mirror also accomplishes a reversal of the image in order that the image projected onto the screen corresponds to that of the slide as seen by the presenter looking down at it, rather than a mirror image thereof. For the latter purpose, the projector includes a mirror just before or after the focusing lens to fold the optical system toward the horizontal. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement that the transparency be placed face up (and readable to the presenter). They were widely used in education and business before the advent of video projectors.Īn overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. These are placed on the glass platen of the projector, which has a light source below it and a projecting mirror and lens assembly above it (hence, "overhead"). In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film (also known as "foils" or " transparencies") with the image to be projected either printed or hand-written/drawn. Overhead projector in operation during a classroom lessonĪn overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience. JSTOR ( February 2008) ( Learn how and when to remove this template message). Unsourced material may be challenged and removed.įind sources: "Overhead projector" – news Please help improve this article by adding citations to reliable sources. ![]() ![]() See for details.ĤVolume is measured in 3D in the CIE L*a*b* coordinate space.This article needs additional citations for verification. The Epson iProjection App does not support all files and formats. Not all Epson projectors are able to be networked. Check your owner’s manual to determine if a wireless LAN module must be purchased separately to enable a wireless connection. Color brightness will vary depending on usage conditions.ģ For wireless functionality, including via the Epson iProjection App, the projector must be configured on a network, either through the Ethernet port on the projector (check model specifications for availability) or via a wireless connection. Color light output measured in accordance with IDMS 15.4 white light output measured in accordance with ISO 21118.Ģ Color brightness (color light output) measured in accordance with IDMS 15.4. IMPORTANT SAFETY INFORMATION ABOUT USAGE ENVIRONMENTS FOR MOUNTED PROJECTORS ►ġ Color brightness (color light output) and white brightness (white light output) will vary depending on usage conditions. Compatible with the latest laptops and media players - supports HDMI, the standard in connectivity, for digital video and audio with just one cable.Fast wireless setup for your mobile device - just scan the on-screen QR code using your phone or tablet.Share HD videos directly from your smartphone, tablet or streaming device - supports Chromecast via HDMI®, plus Roku and MHL-enabled devices.Turn your projector into a smart display - supports full wireless mirroring for Miracast-enabled devices.Fast, easy image adjustments - auto horizontal and vertical keystone correction, plus Screen Fit to quickly adjust the image to fit the screen, even if the projector is placed off center.Far more accurate color with Epson - 3LCD, 3-chip technology for high Color Brightness 2 and wide Color Gamut 4.Wireless - project from your laptop, tablet, or smartphone 3 without plugging into the projector, so you can move freely about the room.Brilliant Full HD performance - 1080p resolution (1920 x 1080) for sharp, widescreen images.Look for two numbers - look for both high color brightness and high white brightness.Lightweight and travel friendly - thin as a laptop weighs just 4 lb.
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