Metal working – Method of mechanical manufacture – Electrical device making
Patent
1997-01-07
1999-11-02
Scherbel, David A.
Metal working
Method of mechanical manufacture
Electrical device making
H04R 3100
Patent
active
059746556
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a method of mounting at least one loudspeaker, and a loudspeaker mounting arranged in accordance with the method, for instance telephone handsets. Depending partly on their field of use, communications equipment may often include at least one microphone and at least one loudspeaker, which may be fixedly mounted in the equipment.
DESCRIPTION OF THE BACKGROUND ART
There are several ways in which a loudspeaker can be fitted to communications equipment. At present, the usual way is to mount the circuit board and loudspeaker separately in a plastic casing with some form of connection therebetween. The loudspeaker is most often suspended softly in a rubber for instance, so as to avoid resonances in a surrounding structure. In those instances when the loudspeakers are mounted on circuit boards, the loudspeakers are always placed with their diaphragms facing away from the board. Loudspeaker mounting processes are required to be simple and inexpensive and the mounting shall fulfill the acoustic requirements placed on the mounting.
DE-A1-3346461 teaches a method of mounting electroacoustic transducers on a conductor plate that has holes opposite the transducers.
SE-B-451933 teaches a loudspeaker equipped arrangement in which the loudspeaker is mounted in a hole in the circuit board with the diaphragm facing away from the circuit board and with a vibration damping ring placed between the hole and the loudspeaker.
DE-A1-3003714 teaches a telephone apparatus that has an electroacoustic transducer mounted on a circuit board.
SUMMARY OF THE INVENTION
With the intention of simplifying the mounting of a loudspeaker on a circuit board in a telephone apparatus while still obtaining the requisite seal and damping between the loudspeaker and the board so as to achieve good sound production, the loudspeaker has been affixed to the board with double adhesive tape with the diaphragm facing towards the board, which has at least one hole located opposite the loudspeaker. The number of holes provided and the size of said holes can be adapted to provide the best sound production, depending on application. With this type of loudspeaker mounting, all components can be collected on the board, therewith simplifying manufacture of the telephone apparatus as such, irrespective of whether the circuit board is in the handheld (receiver) part of the telephone apparatus or in some other part thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a stage in an inventive loudspeaker mounting process prior to mounting the loudspeaker.
FIG. 2 shows an inventive loudspeaker mounting.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1 is a simplified illustration of a telephone apparatus circuit board 1 that has an integrated loudspeaker circuit. A loudspeaker 2 is shown in a position prior to lowering and affixing the loudspeaker onto the circuit board 1. Located between the loudspeaker and the circuit board is a flat ring 3 which may be comprised of elastic double-adhesive material, such as elastic double adhesive tape. The circuit board is perforated with holes 4 in the region beneath the loudspeaker for production of loudspeaker sound. The loudspeaker is connected electrically to the circuit board by twin conductors 5. In the illustrated case, the means by which the necessary seal against the board and the transmission of occurrent mechanical vibrations are dampened has the form of an adhesive tape annulus.
FIG. 2 shows the loudspeaker firmly mounted on-the circuit board with the aid of the adhesive tape annulus, with the loudspeaker diaphragm facing towards the board in the region of the holes 4.
The actual procedure of mounting the loudspeaker on the board is preceded by securing an adhesive annulus 3 to the board 1 after having positioned the annulus in accordance with markings on the board. When the annulus has been fixed in position, the loudspeaker 2 is pressed onto the annulus. It has been found that the bond afforded by a double adhesive annulus, ie an annulus that is a
REFERENCES:
patent: 4931029 (1990-06-01), Hwang
Gustafsson Sune
Lindman Lennart
Mellgren Ronny
Halpern Benjamin M.
Scherbel David A.
Telefonaktiebolaget LM Ericsson
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