Runco Home Theater Projection System 用户手册

Throw distance is the distance measured from the front of the projector to the screen. 
This is an important calculation in any projector installation as it determines whether or not 
you have enough room to install your projector with a desired screen size and if your 
image will be the right size for your screen.

You can quickly estimate the throw distance by taking the width of the screen and 
multiplying it by the lens throw ratio; see Figure 3-1. The result of this calculation tells you 
roughly how far back the projector should be positioned from the screen in order to 
project a focused image large enough to fill the screen.

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Estimating Throw Distance
Throw Distance (TD)  = 
Screen Width (w)  x  Lens Throw Ratio

TD

Scr

een width (w)