JPS61139189A - Handset - Google Patents

Abstract

PURPOSE:To reduce a change in sound quality due to a change in a contact condition of a handset and an ear by forming a sound opening for connecting a front surface and a rear surface of a diaphragm of an ear piece unit at an outside periphery of the ear piece part of a housing. CONSTITUTION:At an outside periphery of an ear piece part 2 of a housing 1, a sound opening 5 for connecting acoustically a front surface and a rear surface of a disphragm 4 of a receifing unit 3 is formed. For instance plural sound openings 5 are disposed at the outer periphery of the ear piece 2 of the housing 1, and communicate an inside and an outside of the housing and acoustically connect the front surface of the diaphragm 4 of the receiving unit 3 with the rear surface thereof. Thereby, since a part of a sound wave from the sound opening is leaked through the inside of the housing 1 in case of contacting tightly to the ear, a raise of a sound pressure, in the section of the ear piece part 2 is reduced. Namely since a similar operation to the case when there is a clearance between a handset and the ear is carried out, even if a contact condition with the ear is changed, a change in a acoustic change is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a handset mainly used in telephones.

A conventional handset will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a cross-sectional view of the receiving portion of a conventional telephone handset, where 1 is the housing of the handset, 2 is the receiving unit 0, 3 is the receiving unit, and 4 is the moving plate of the receiving unit 3. When listening to this handset, the earpiece 2 of the housing 1 is placed against the ear. At this time, a small sealed volume is formed in front of the diaphragm 4 of the receiving unit 3. It is designed so that predetermined acoustic characteristics can be obtained in this state.

Problems to be Solved by the Invention According to the above conventional configuration, there is no F between the earpiece 81$2 and the ear.
When a gap is created, air leaks outside, and the level of the bass region in particular decreases, resulting in a harsher sound.

Figure 4 shows the characteristic change at this time, which is only 0.5 m.
It can be seen that even a gap of - shows a large change in characteristics.

SUMMARY OF THE INVENTION An object of the present invention is to provide a handset that solves the above problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the handset of the present invention includes a sound hole on the outer peripheral part of the earpiece of the housing to acoustically couple the front and rear surfaces of the diaphragm of the earpiece unit. It was formed.

Effect With the above configuration, even when the handset is placed in the ear, some of the sound waves leak into the housing from the sound hole.
The behavior is similar to when there is a gap between the hand center and the ear.

X Flow Side Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a partially cutaway side view of a receiver part of a handset according to an embodiment of the present invention, and the same components as those shown in FIG. In FIG. 1, reference numeral 5 denotes a sound hole. A plurality of sound holes 5 are provided around the outside of the earpiece 2 of the housing 1, and are used to communicate between the inside and outside of the housing 1. The front and rear surfaces of the diaphragm 4 of the unit 3 are acoustically coupled.

The effects of the above configuration will be explained below.

Even when the handset is placed in close contact with the ear, some of the sound waves leak into the housing 1 from the sound hole 5, so that the rise in sound pressure at the earpiece 2 is reduced.

In other words, the operation is similar to that when there is a gap between the handset and the ear, so even if the close contact with the ear changes, the sound W
This means that there are few changes in temporality.

The relationship between the earpiece 2, which transmits sound to the ear, and the sound hole 5, which allows sound to escape to the inside, is such that the acoustic impedance of the sound hole 5 is increased so that the energy of the sound transmitted to the ear is not reduced too much. do it like this.

In addition, in the conventional configuration, since the sound hole 5 does not exist, the volume between the ear and the handset is in a sealed state and is 1lllf.
'l'l, but in this embodiment it is in an open state.Therefore, the receiving unit 3 is used to realize the desired acoustic characteristics.
The design conditions are different from the conventional ones, and it is necessary to set the to (R low resonance frequency) near the lower limit of the required reproduction band (300 to 5 OOH).

In the handset of this embodiment, the ear! ! FIG. 2 shows an example of changes in characteristics when the FW situation changes.

It can be seen that the change in characteristics is smaller compared to the conventional example shown in FIG.

VJ Results of the Invention As described above, according to the present invention, changes in sound quality due to changes in the state of contact between the handset and the ear can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the receiving part of a handset according to an example of the present invention, and FIG. 2 is an explanatory diagram of changes in characteristics when the state of close contact with the ear changes in the same handset.
Figure 3 is a cross-sectional view of the receiving part of a conventional handset;
The figure is an explanatory diagram of changes in characteristics when the handset is in close contact with the ear. DESCRIPTION OF SYMBOLS 1... Housing, 2... Earpiece part, 3... Receiving unit, 4... Vibration plate, 5... Sound hole agent
Yoshihiro Morimoto No Figure 2 101) 100 300 /k 2K 5
K (Hz)

Claims (1)

[Claims] 1. A handset in which a sound hole is formed on the outer periphery of the earpiece of the housing to acoustically connect the front and rear surfaces of the diaphragm of the receiver unit.