Epson 51c 정보 가이드
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Knoware University at http://knoware.epson.com
detailed Epson product information online in the EPSON
Knoware University at http://knoware.epson.com
Summer 2002
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Answers
What is projector “throw distance” and how can I find out the throw distance
of an Epson projector?
of an Epson projector?
To set up a projector properly requires an understanding of where to position the projector realtive
to the screen. Putting the projector too far away makes the image too large and faint. Placing the
projector too close to the screen makes the image toosmall. A projector’s throw distance is a calcu-
lation that gives you the optimum distance for placing your projector.
to the screen. Putting the projector too far away makes the image too large and faint. Placing the
projector too close to the screen makes the image toosmall. A projector’s throw distance is a calcu-
lation that gives you the optimum distance for placing your projector.
The basic rule is that light intensity decreases in inverse proportion to the square of the distance.
Did You Know?
So how do you determine your optimal throw distance? Whether you are presenting in a classroom, confer-
ence room, training room, or auditorium, you will need to know one of these two things in order to correctly
position the projector:
ence room, training room, or auditorium, you will need to know one of these two things in order to correctly
position the projector:
At a two-foot distance, light
will be 1⁄4 the intensity and
cover 4 times the area as the
same beam of light at a one-
foot distance.
will be 1⁄4 the intensity and
cover 4 times the area as the
same beam of light at a one-
foot distance.
Screen Size — Once you know your room size and layout, you will need to know the size of the screen.
If the room you are presenting in has a built-in screen, measure the dimensions of the screen, including
the diagonal (corner to corner). This will determine where to postion your projector to adequately fi ll
the screen. If the room layout does not accommodate the throw distance you need, one alternative is to
use a projector with a replaceable lens that will provide either a longer or shorter thow distance than the
standard lens allows.
If the room you are presenting in has a built-in screen, measure the dimensions of the screen, including
the diagonal (corner to corner). This will determine where to postion your projector to adequately fi ll
the screen. If the room layout does not accommodate the throw distance you need, one alternative is to
use a projector with a replaceable lens that will provide either a longer or shorter thow distance than the
standard lens allows.
Throw distance — If you know the throw distance you require (based on the room layout) and what the
projector can handle, you can easily calculate the optimal screen size using the chart below. Basically,
the longer your throw distance, the larger your screen size will be.
projector can handle, you can easily calculate the optimal screen size using the chart below. Basically,
the longer your throw distance, the larger your screen size will be.
EPSON PowerLite 51c/71c
Screen size:
Screen size:
Wide
36”
71”
105”
140”
175”
210”
279”
313”
348”
Tele
29”
58”
87”
116”
144”
173”
231”
260”
305”
Distance
4.2’
8.3’
12.5’
16.7’
20.8’
25’
33.33’
37.5’
41.7’
Distance
Intensity
Image Size
1 foot
2 feet
3 feet
1/4
1/9
1
1X
4X
9X