Acoustics – Combined
Patent
1995-07-07
1997-04-01
Dang, Khanh
Acoustics
Combined
181150, H05K 500
Patent
active
056168918
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a sealing panel for automobiles, in particular for sealing doors, and in which a special loudspeaker housing is formed such that he original acoustical properties of the loudspeaker are preserved.
PRIOR ART
In the construction of automobile vehicles it is necessary to seal the interiors of the doors to prevent rainwater entering the passenger compartment and coming into contact with the interior finish of the vehicle. One known way to provide this seal is to glue an impermeable film to the internal structures of the door, the function of this film being to prevent infiltration of water and entry of air and dust into the vehicle. These impermeable films are usually in the form of a plastic material film coated with an adhesive to facilitate application. Foam films can also be used, in particular polyethylene foam; polyethylene foam films are usually between 2 mm and 10 mm thick and a bead of glue is applied to their perimeter; they can be thermoformed so as to mate intimately with the pressed sheet metal supporting structure of the door. More complex structures can also be used made up of a plurality of layers of different materials, these improvements usually being intended to improve the soundproofing of the passenger compartment and to improve the comfort of the passengers.
However, the presence of the sealing panel disturbs the operation of the loudspeakers which are usually located in the door structure.
The sealing panel is in the immediate vicinity of the rear of the loudspeaker and reflects sound radiated from the rear of the loudspeaker towards the passenger compartment. The reflection of the sound from the rear of the loudspeaker significantly disturbs the acoustical quality perceived within the passenger compartment. To avoid this problem it is standard practice to cut out the sealing panel where the loudspeaker is to be located: this improves the acoustic result, but the panel is no longer able to fulfil its sealing role and rainwater or dust may infiltrate into the interior lining of the door.
OBJECT OF THE INVENTION
An object of the present invention is to propose a new type of sealing panel, especially for automobile doors, which has the advantage of preserving the acoustic response properties of the loudspeakers.
SUMMARY OF THE INVENTION
In accordance with the invention a sealing panel for automobile doors is made from a sheet material that is shaped to provide a loudspeaker housing having a special structure and the back of which is provided with cells open at one end and having at least one opening at the opposite end.
An improved acoustic property sealing panel of the invention is made from a sheet material which can be deformed into shape. The material is usually a thermosetting plastics material such as polyethylene or polypropylene and may contain reinforcing agents such as glassfibres and fireproofing agents. These sheets can be in the form of a film but it is preferable to use a plastics material in the form of a closed cell foam, the sheet having a thickness between 1 mm and 10 mm. Thermosetting composite sheets made up of a plurality of layers of different materials can also be used, especially to improve the thermal insulation and the soundproofing of the passenger compartment.
The material is shaped to mate perfectly with the structures of the door inside which it is to be fitted. The shaping is usually effected by thermoforming or hydroforming, methods well known to the person skilled in the art.
In accordance with the invention, in addition to the specific shapes due to the structure of the door, special patterns are formed at the back of the housing for the loudspeaker, the function of which is to prevent reflection of the sound radiated from the rear of the loudspeaker. To achieve this result the patterns are disposed on the outside face of the back of the housing opposite the inside face on which the loudspeaker bears and are frustoconical in shape, with a circular, square or trapezoidal cross-section. The loudspeaker housing of a seal
REFERENCES:
patent: 4277653 (1981-07-01), Pawelzick
patent: 4337380 (1982-06-01), Tezuka
patent: 4790407 (1988-12-01), Yamamoto et al.
patent: 4853966 (1989-08-01), Skrzycki
patent: 4905860 (1990-03-01), Kurihara et al.
patent: 4928788 (1990-05-01), Erickson
patent: 5117938 (1992-06-01), Whanhaeng
patent: 5414229 (1995-05-01), Rocheleau et al.
Dang Khanh
Plasto SA
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