Ericsson DIALOG - Handset Ergonomics and Acoustics

3,7 Hands et
Fig. 24
The hand-
s et
16
The handset cord and the instrument cord each have a mechanical
unloading devi ce (fig. 23), designed as metal detents. each fastened
to a hole in the base plate. The other end of the handset resp.
instrument cord has the same unloading device which fits into a
slot in the transmitter cup in the l ower part of the handset resp.
into the wall terminal box.
The handset (fig. 24) is made of the same plastic material as the
instrument case.
The handset is well balanced for easy and comfortab le handlin g.
The distance and angle between the earpiece and mouthpiece are
especially designed to provide the correct speaking position for the
average telephone user.
The mouthpiece is of the flat type. Owing to its design and
position in relation to the mouth, the voice of the speaker is
caught in the most suitable way, regarding efficiency and intelli-
gibility as well as comfort.
The earpiece is shallow , i.e. it provides resonance space for good
acoustic matching to the ear volume.
Fig. 25
The dif-
ferent
parts of
the hand-
set
(Front
view of
the trans-
mitter cup)
The transmitter and receiver insets are designed as easily
changeable capsules (fig. 25) thus facilitating comfortab le and
speedy maintenance. Contact sprin gs are silver plated to ensure
good contact. The receiver has screw connections.
The connection wires which are laid inside the hollow handset
shaft are easily removed.
The transmitter is placed in a removable cup (fig. 25-26) in the
lower part of the handset. The rear of the cup is provided with
terminals for connecting the handset-cord conductors as well as
a slot for the mechanical unloading device.
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