Novell Suse Linux Professional 9.2 00662644457284 ユーザーズマニュアル
製品コード
00662644457284
22
Er
gonomics
in
the
the
W
or
kplace
kplace
Ultimately, the workstation should be individually adapted to the person
and the working task. Flexibility is the key. Easily movable, rotatable, and,
ideally, screens that retract into the table are encouraged.
and the working task. Flexibility is the key. Easily movable, rotatable, and,
ideally, screens that retract into the table are encouraged.
A comfortable visual distance varies individually. At least 50 cm is required.
Some people need considerably more.
Some people need considerably more.
It is a good idea for users to look away from the screen from time to time. In
this way, their eyes can adapt to a different distance.
this way, their eyes can adapt to a different distance.
If a document is being copied, it should be at the same distance as the
screen to avoid frequent changes of focus.
screen to avoid frequent changes of focus.
The difference in luminance between the direct working area, the screen,
and the immediately surrounding areas, such as the screen case, should
not be more than three to one. For this reason, computer cases in offices are
not black. The difference between the working area and the surroundings
should not be more than ten to one.
and the immediately surrounding areas, such as the screen case, should
not be more than three to one. For this reason, computer cases in offices are
not black. The difference between the working area and the surroundings
should not be more than ten to one.
Shiny areas create large differences of luminance. This is why office furni-
ture is not available in bright colors and has a matt surface.
ture is not available in bright colors and has a matt surface.
To minimize the reflex glare on the screen, the screen and the keyboard
should be arranged so the line of vision is parallel to window panes. The
further the screen is away from the window, the better.
should be arranged so the line of vision is parallel to window panes. The
further the screen is away from the window, the better.
The screen should not be directly under a lighting strip, but to the side of it.
The line of vision should be parallel to the lighting strip.
The line of vision should be parallel to the lighting strip.
22.2.3
The Keyboard and the Wrists
It is well-known that the keyboard arrangement derived from the typewriter is
not necessarily ergonomic. During typing, the fingers, hands, arms, and shoul-
ders are strained. This leads to tense muscles. The strain caused by a keyboard of
inferior quality adds up over time. Unfortunately, the tiny movements produced
while typing are very difficult to measure. Risk factors include the RSI syndrome.
not necessarily ergonomic. During typing, the fingers, hands, arms, and shoul-
ders are strained. This leads to tense muscles. The strain caused by a keyboard of
inferior quality adds up over time. Unfortunately, the tiny movements produced
while typing are very difficult to measure. Risk factors include the RSI syndrome.
The keyboard is, without doubt, the most frequently-used computer input device.
Therefore, it must be especially well-designed. Ergonomic specialists often crit-
icize the fact that the
Therefore, it must be especially well-designed. Ergonomic specialists often crit-
icize the fact that the
Shift
and
Enter
keys are too small. Another basic problem
is the cable, which is often too short, preventing a comfortable individual place-
ment. Consider buying a wireless keyboard or an extension for the cable.
ment. Consider buying a wireless keyboard or an extension for the cable.
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