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3M Multimedia Projector MP8620 Theory and Diagrams

3M 1999 4-6

4-6.

Keystone Correction

A correct projection image on the MP8620 should be

square and in focus. A projection image that is wider at

the top and has a softened focus has keystoning.

Keystoning is visible on the MP8620 when the

projection to screen angle is greater than sixteen

degrees. As the front of the projector is raised the

projection angle increases. At sixteen degrees the

projection image is still square and in focus, at nineteen

degrees keystoning can be seen.

The MP8620 is keystone corrected at a ratio of 3.9 to 1

to provide a square focused image as shown. Restated,

for every 3.9 feet of projection distance the image is

raised 1 foot. This feature allows for 80% of the

projection image to appear above the lens center with

only 20% appearing below.

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Quantum Data 801GX Manual de Serviço Página 44