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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a handset used in an intercom system, and more particularly to a handset structure
using a ceramic receiver.
2. Description of the Related Art Heretofore, as shown in FIGS. 5 and 6, a receiver unit 50 of a
handset used in an intercom apparatus comprises an earpiece 61 which strikes the ear, a sound
emitting hole 62 for receiving sound, and a resonance for determining acoustic characteristics.
The space 66, the partition 63 for obtaining a space for resonance, the ceramic receiver 65, and
the packing 64 for preventing the gap from being formed between the partition 63 and the
ceramic receiver 65.
Further, the space for resonance 66 fixes the ceramic receiver 65 to the partition wall 63 and has
the same shape as the outer periphery of the partition wall 63, thereby securing a space capacity
by the packing 64 for bringing the ceramic receiver into close contact.
In such a handset, the received sound emitted from the ceramic receiver is an acoustic resonance
circuit composed of the resonance space 66 and the sound emission hole 62 of the earpiece, the
sound emission hole 62 and the user's outer ear, The reception characteristic is obtained by an
acoustic resonance circuit composed of the space capacity between the earpieces.
At this time, a space capacity formed between the resonance space 66 and the outer ear of the
user and the earpiece is a capacitor (C), and the sound emission hole 62 constitutes an LC
resonance circuit as an inductance (L).
By the way, in the conventional structure of the interphone handset, since the characteristics are
determined by the ceramic receiver, the space for resonance and the sound emission hole, the
earpiece portion is made of a mold once. It is difficult to change the characteristics easily, and the
characteristics of the earpiece of the user, especially the receiver's ear characteristics, especially
the high frequency range of the elderly caused by aging, are significantly lower, and there is no
conventional correction function for the elderly. The handset was difficult to hear.
SUMMARY OF THE INVENTION The present invention is made to eliminate the above-mentioned
conventional problems, and an object of the present invention is to provide a structure which can
correct the high frequency range inexpensively with a simple structure without using a
complicated electric circuit.
A handset structure according to the present invention comprises a ceramic receiver for emitting
a received voice, a partition for holding the ceramic receiver, a packing for bringing the ceramic
receiver into close contact with the partition, a ceramic receiver and the partition And a packing
for surrounding the resonance, a gap provided in the partition, a movable piece for covering the
partition, and a knob for operating the movable piece, the movable piece being a gap It is
characterized in that it has a spring property which can cover from the fully closed to the fully
open steplessly.
According to such a handset structure, by controlling the opening area of the gap provided in the
partition wall with the movable piece, the space capacity of the resonant space between the
ceramic receiver of the handset and the partition wall is increased, and acoustically low.
Deterioration of the tone range can be generated, and the high tone range can be relatively
corrected as the bass range decreases.
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a handset structure
according to the present invention will be described in detail with reference to the drawings.
The external appearance of the handset according to the present invention is, as shown in FIG. 1,
comprised of an earpiece 11 that hits the ear, a sound emission hole 12 for receiving sound, and
a knob 19 for sound quality adjustment. As shown in FIG. 2, it comprises a resonant space 16 for
determining the acoustic characteristics, a partition 13 for obtaining the resonant space, and a
packing 14 in which the ceramic receiver 15 is inserted between the partitions 13.
Further, the packing 14 has a circular shape like the shape of the outer periphery of the partition
13 and has a structure in which no gap is formed between the ceramic receiver 15 and the
partition 13.
The gap 17 is provided on the side surface of the partition wall 13 constituting the resonance
space for the purpose of generating sound leakage, and constitutes an opening in a triangular
shape that logarithmically extends from the top to the bottom.
As shown in FIGS. 3A and 3B, the movable piece 18 has a cylindrical portion 21 for holding the
movable piece holding rib 20 provided on the partition wall 13 and a packing for sealing the gap
17. The cylindrical portion 21 is fitted to the movable piece holding rib 20 as shown in FIG. 3C.
Further, as shown in FIG. 4, the movable piece is structured such that the gap is fully opened at
the position of 19a by the knob 19 attached to the receiver 1, and the gap is completely closed at
the position of 19b It is done.
The operation of the handset structure according to the invention will now be described.
As described above, the space on the front surface of the ceramic receiver 15 acoustically plays
the role of the capacitor C1, and the sound emission hole 12 of the earpiece 11 can be treated as
the inductance L1.
The C1 and L1 constitute an LC resonance circuit, and the inductance L1 and the space
capacitance C2 of the outer ear of the receiver similarly constitute a resonance circuit, and when
the gap 17 is fully closed, the space capacitance of the resonance space 16 is C1, and in addition
to the single characteristics of the ceramic receiver 15, the reception characteristics desired by a
healthy person are obtained, but when the gap 17 is fully open, the space capacity C1 of the
resonance space 16 is open and low Due to the reduction of the sound pressure in the range, the
characteristics of the high range relatively increase.
By controlling the opening area of the gap 17 from the fully closed position to the fully open
position by the movable piece 18, it is possible to control steplessly from a reception sound easy
for a healthy person to hear to a reception sound corrected for high frequency range used by an
elderly person .
Thus, the gap 17 can be varied steplessly from full open to full close until the knob 19 moves
from 19a to 19b, and the change of the open area changes the capacity of the capacitor C1 from
C1 to open As a result, the bass range is varied from the normal characteristic to the
characteristic in which the bass range is lowered.
As apparent from the above description, in the structure of the handset according to the present
invention, the acoustic characteristics can be adjusted steplessly according to the characteristics
of the ear from the healthy to the elderly according to the characteristics of the ear of the
receiver It is possible to obtain
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