JPS63296598A - Loudspeaker cabinet with air-tightly enclosed housing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a loudspeaker box with a hermetically closed housing.

[Conventional technology]

Damped loudspeaker boxes must be hermetically closed on all sides to avoid acoustic short circuits and to prevent the generation of vortices, noise and noise due to gaps at certain frequencies. Structural measures are generally required to obtain a gas-tight closure.

[Problems to be solved by the present invention]

The object of the invention is to provide a hermetically closed loudspeaker box which can be assembled particularly quickly and easily with a small number of parts.

[Failure to solve the problem]

The gist of the present invention that solves the above problems is as described in claim 1. Unique configurations are described in claims 2-9.

[Actions and effects of the present invention]

The loudspeaker box according to the invention emits radiation only from approximately six parts: the loudspeaker, the front housing part and the rear housing part. These parts are each assembled manually or mechanically by a positive engagement, also a so-called snap-in engagement. This combination simultaneously results in a gas-tight closure of the parts. There is a set of parts.

No airtight closure front means are required.

It is advantageous to construct the entire loudspeaker box in such a way that the mutually opposed walls of the loudspeaker box are not located parallel to each other. In this way, an asymmetrical reflective surface and a scattered sound field are created, and standing waves that induce noise during reproduction are avoided.

For the additional avoidance of the generation of scattered sound fields and of standing waves occurring, for example in rectangular loudspeaker boxes, and to obtain reinforcement of the loudspeaker box, the inner walls of the loudspeaker box or the inner walls of the rear housing part It is advantageous to provide a large number of ribs. According to this configuration, standing waves disappear due to the asymmetric structure of the loudspeaker box and the large number of ribs, and no noise is generated during playback. In the front housing part, ribs extending radially toward the center of the bass loudspeaker are arranged, and in the rear housing part, a rectangular structure is arranged in a plane perpendicular to the radial direction of the loudspeaker. Advantageously, the ribs are arranged. The ribs are arranged differently in the front and rear sections in order to influence the sound field within the loudspeaker box in a diagonal manner. In that case, it is advantageous if the projections of the ribs of the front and rear Uzong parts have different angular positions with respect to the radial direction of the loudspeaker. According to such measures, the principles and knowledge of architectural acoustics, for example in concert halls and music salons, can be used to advantage in the construction of loudspeaker boxes, thereby improving the sound pattern, in particular the reduction of settling waves and therefore of noise during playback. Evasion is obtained.

A gas-tight closure is not necessary only in the frequency range of the audible sound signal with a lower limit of approximately 50 Hz 1, but is also necessary to maintain a given overpressure or underpressure in the loudspeaker box indefinitely. It is. Advantageously, the shape of the loudspeaker box is adapted to the shape of the cathode ray tube in the television receiver. In this way, the relatively small space between the cathode ray tube and the side wall of the television receiver can be optimally utilized, and the space available for the loudspeaker box is relatively small. °
Nevertheless, it is possible to provide the loudspeaker box with sufficient volume for sufficient damping.

〔Example〕

In FIG. 1 the loudspeaker box has a housing 1 . A loudspeaker 3 is inserted into the front wall 2 of the housing 1 from the front, that is, from the left in FIG. This locking part 4 is connected to the front wall 2
A resilient nose 5 is formed by being anchored to a rigid edge of the loudspeaker cage. The airtight closure between Franzolo and the front wall 2 in front of the loudspeaker 3 is created by inserting a seal γ made of rubber, for example. A housing part 8 is mounted on the rear end of the housing 1 in the direction indicated by the arrow 9 and securely engaged with the housing 1 by means of a number of circumferentially distributed locking parts 10. In that case,
A gas-tight closure is provided between the housing 1 and the rear housing part 8.
It is formed by a packing 11 inserted between.

The rear housing part 8 is provided with a number of ribs 12t, which serve for reinforcement and additionally for the generation of scattered sound fields due to multiple reflections and thus for the avoidance of standing waves. of·
The front surface of the housing 1 is fixed to the side wall 14 of the television receiver via a grid 13t.

The outer shape of the rear housing part 8 is adapted to the shape of a cathode ray tube 15 installed in the television receiver. This allows the television receiver to make optimal use of the relatively narrow space that exists between the side wall 14 and the cathode ray tube 15 inside the machine.

Figure F2A shows the open side of the housing part 8, and Figure 2B shows a section along line 2A--2A of Figure 2A. The housing part 8 is provided with a number of ribs 12 on its inside;
The ribs thereby form a modic-like area with a limited surface. This rib 12 is the housing part 8
It serves as a trap for reinforcement, as well as for forming a scattered sound field in the loudspeaker box and for avoiding standing waves.

An annular groove 16 is formed in the annular edge of the housing part 8), and a packing 11 made of rubber and having a circular cross section, for example, is inserted into this annular groove. The seal 11 is not designed as a closed ring for cost reasons;
It consists of a metric piece with two ends. In order to ensure that the gas-tight closure is not interrupted at either end, the annular groove 16 has two short sections 16 located next to each other.
a, 16 b. Thereby, the ends of the gasket inserted into this part isa, 16b are located directly next to each other, housing 1 and housing 8.
Later on, assembly with an endless annular seal results in a consistent gas-tight closure. Pins are provided at key points on the annular edge of the annular groove 16. This serves to ease and facilitate insertion of the seal 11 into the annular groove 16 during manual insertion of the seal.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2A is a view looking at the open side of the rear housing portion, and FIG. 2B is a sectional view taken along line 2A-2A in FIG. 2A. 1... Casing, 2... Front wall, 3... Loudspeaker,
4... Retaining part, 5... Nose, 6... Flange,
γ...Packskin, 8...Housing part, 9...
Arrow, 10... Locking part, 11... Packing, 12.
...Rib, 13...Lattice, 14...Side wall, 15...
・Brown tube, 16...Groove, 16at16b...Short part, 11...Pin Fig, 2A

Claims (1)

[Claims] 1. A loudspeaker box with a hermetically closed housing, in which the airtight closure is provided by the loudspeaker or loudspeakers on one side and by the rear housing part (8) on the other side.
), and the loudspeaker (3) and the housing part (8) are connected to the housing (1) through the locking parts (4, 10) that are securely engaged with the packings (7, 11). )
A loudspeaker box with a hermetically closed housing, characterized in that the loudspeaker box is mounted in a hermetically closed housing. 2. The mutually opposing walls of the housing (1) and/or the housing part (8) are not parallel to each other and are reinforced by internally located ribs (12). Loudspeaker box as described. 3. Loudspeaker box according to claim 1, characterized in that the shape of the housing (1) and/or the housing part (8) is adapted to the shape of the contour of a cathode ray tube (15) in a television receiver. 4. The housing (1) or the housing part (8) has a groove (1) in its annular edge for inserting the packing (11).
6) The loudspeaker box according to claim 1, comprising: 6). 5. Loudspeaker box according to claim 4, characterized in that the short sections of the grooves at both ends of the inserted packing (11) lie directly next to each other. 6. A loudspeaker box according to claim 4, wherein a protruding pin (17) is provided on the edge of the groove to facilitate manual insertion of the packing (11). 7. According to claim 2, the ribs (12) provided on the front and rear housing parts (1, 8) are geometrically differently arranged so as to influence the sound field inside the box as a diff user. loudspeaker box. 8. The ribs of the front housing part (1) extend radially with respect to the center point of the bass loudspeaker, and the ribs (12) of the rear housing part (8) extend perpendicularly to the direction of radiation of the bass loudspeaker. 8. The loudspeaker box according to claim 7, having a rectangular structure in a plane. 9. Loudspeaker box according to claim 7, wherein the projections of the ribs of the front and rear housing parts (1, 8) have different angular positions with respect to the radial direction of the loudspeaker (3).