Chapter 2
Getting Started
—
Setting up
ENGLISH -
41
ET-D3LEF70C
D
L
L1
θ
Lens optical axis
Screen
Note
f
This illustration is prepared on the assu
m
ption that the projected i
m
age size and position ha
v
e been aligned to
fi
t full in the screen.
f
This illustration is not in accurate scale.
f
The lens optical axis is the sy
mm
etrical axis passing through the center of the optical i
m
age syste
m
. This does not
m
atch
w
ith the i
m
age
center position at the ho
m
e position. The ho
m
e position is an origin position of the lens shift
(v
ertical position and horizontal position of the
lens
)
based on the calibration result.
f
As the front end of the projection lens approaches closer to the center point of the spherical screen and center axis of the cylindrical screen,
the focus and brightness unifor
m
ity of the
w
hole projected i
m
age is enhanced.
L
Projection distance
(
distance fro
m
the front end of the projection lens to the screen surface
)
L
1
Lens protrusion di
m
ension
(
distance fro
m
the front surface of the projector to the front end of the projection
lens
)
θ
Projection angle of
v
ie
w
(
angle fro
m
the lens optical axis
)
D
Exit pupil position
(
Unit:
m)
Supported range of projection
distance
(
L
)
2
to
∞
Lens protrusion di
m
ension
(
L
1)
0
.
3
85
For
m
ula for exit pupil position
(
D
)
*
1
= -
10
-8
x
θ
3
-
3
x
10
-7
x
θ
2
-
1
.7
3
x
10
-5
x
θ
+
0
.
02342
*
1
Unit for the
v
alue to assign the
θ
is °. Values obtained by the for
m
ula
(m)
contain a slight error.
Projection angle of view (
θ
) (Unit:
°
)
Value of exit pupil position (D) (approximate value) (Unit: m)
10
0
.
0232
20
0
.
022
9
30
0
.
0224
40
0
.
021
6
5
0
0
.
020
6
6
0
0
.
01
9
1
7
0
0
.
01
7
3
8
0
0
.
01
5
0
9
1
.6
0
.
011
6
Note
f
For the adjust
m
ent range of the projected i
m
age position
w
ith the lens shift, refer to “Lens shift range
”
(
x
page 86
)
.
