DE7215384U - SPEAKER PANEL - Google Patents

Description

Patent attorney · · ■ ■ ■ '■ Dt> l.-Ing. Walter Jacked! Stuttgart M, MiiiMliinti 40 ψ

WEGA RADIO

society with limited

Liability A 32 871 - mU

FeUbaeh aen .. _{M m}

"Loudspeaker bezel ¹¹

The invention relates to speaker panels with a Outer edge and a center as well as over the, for example plate-shaped aperture, in particular grid-like distributed holes

In known loudspeaker panels of this type, there are only holes of the same size in rows and in addition right-angled columns provided. This makes it necessary to determine the hole size, the hole pitch and the Coordinate the width of the unperforated edge to avoid material tension or similar material behavior to keep within limits. In addition, the acoustic reproduction properties of those provided with such diaphragms Loudspeaker boxes are impaired by the fact that a noticeable effect is caused by reflections at the holes The sound pressure curve collapses in a relatively narrow frequency range.

The invention is based on the object of designing a loudspeaker grille of the type described at the beginning, that the disadvantages described are avoided in a simple manner.

This is achieved according to the invention in that holes closer to the center of the diaphragm are larger than further distant holes are. Due to the shrinking

Loctning on the edge of the speaker bezel will increase its stability significantly increased and material stresses are reduced and better distributed. Since the perforation in the middle, i.e. the largest in the radiation area of the loudspeaker, can, due to the larger open screen surface, the Sound permeability can be increased. Due to the different hole size, any occurring concentrate acoustic reflection phenomena are not spread over a narrow frequency range, but are evenly distributed; Long-falsifying breaks in the sound pressure curve are avoided by the design according to the invention.

This is further improved as the size of holes towards the center of the diaphragm increases in several stages and especially when all the holes towards the center of the diaphragm are increasingly larger.

In an advantageous embodiment, the smallest Holes about half as cast as the largest L <5chex ·, so that there are no differences that are too great.

The mode of action according to the invention is further improved, when the size of holes from at least two opposite sides of the center, in particular two parallel outer edges of the diaphragm increases towards the center. It is particularly advantageous if the size of holes increases from all outer edges to the center of the diaphragm. But it is also conceivable that the size of holes only from two opposite outer edges increases towards the center.

To simplify the structure and to further improve the acoustic properties of the loudspeaker grille are

It I

in the center field of the diaphragm several holes of the same size in two mutually transverse holes Directions provided next to each other, so that the largest, holes of the speaker grille in a relatively large field are provided.

The holes can be provided in a simple manner distributed like a grid that the center distance of neighboring Holes of different sizes, in particular all neighboring holes, is approximately the same. It is also for this purpose expedient if the holes are in particular parallel rows and columns at right angles thereto, in particular parallel columns are provided.

In a simple embodiment cuts (cut) the common axial plane (s) of the holes in at least one row, in particular the common axial planes of the holes of all rows coincide with the common axial plane of the holes of at least one column, in particular the common axial planes of the holes of all columns in the axis of one of the holes of this column, i.e. the holes of adjacent Rows or columns are not offset from one another.

The sound permeability can, however, be increased by opening the holes in adjacent rows and / or columns against each other, preferably offset by the calf hole division are provided so that a relatively large number of holes can be accommodated.

To further simplify the structure, all holes in rows and / or columns are essentially the same size. In some However, it is useful if the end of

Il If

14 11 '

I I I;

I I I I till

r 4 -

Holes lying in rows and / or columns are smaller than the remaining holes in the respective associated cell or column, which are preferably of the same size as one another. The advantages of the two last-mentioned training courses can be achieved at the same time ⁷ ? , Sat alternating rows or columns with holes of the same size and rows or

Columns with smaller holes at the ends are provided. ·

The holes can be circular, long or angular, such as square or similar.

The invention is explained in more detail below with further details; the drawings show several exemplary embodiments with the parts essential for the invention

again. These parts are, as far as

they cannot be taken directly from the drawings, explained with reference to the drawings. They are shown in:

1 shows a perforated diaphragm according to the invention in view,

FIG. 2 shows four further embodiments in representations - * corresponding to FIG. 1.

As FIG. 1 shows, a perforated diaphragm 1 according to the invention is essentially rectangular and provided in a grid-like manner with holes 2 to 4 of different sizes. The holes 2 closest to the outer edges 5, 6 of the loudspeaker bezel 1 are the smallest, while the holes 4, which are provided in the center field which is the center of the loudspeaker bezel 1, are the largest, namely about twice as large as the smallest holes 2 are. The drawings only show the basic structure; In practice, considerably more rows (approx. 20 × 40) and more graduations of the hole diameter are provided.

In the embodiment shown in Fig. 1, the holes 2, 3 and 4 are in rectangular perforated rings and so on The center of the loudspeaker bezel 1, the perforated

wreaths run parallel to the outer edges 5, 6. The holes 2 to 4 are thus provided in rows 7 to 9 and in columns 10-12 lying at right angles to them, the holes in the outermost rows 7 and in the outermost columns 10 being all the same size, while in the adjacent rows 8 and 12 respectively Columns 10, the holes 2 provided at the ends are smaller than the remaining U 3. Lines 9h ^ provided adjacent to this. Columns 12 each have three holes 2 to 4 of different sizes at their ends. In the middle of the loudspeaker panel 1, all holes 4 are the same size. In the embodiment according to FIG. 1, the holes are thus provided with the same pitch and a straight line.

2 to 5 have the same reference numerals as in FIG. 1, but in FIG. 2 with the index a, in FIG. 3 with the index b, in FIG. 4 with the index c and in FIG 5 used with the index d.

In the loudspeaker grille la according to FIG. 2, the holes 2a, 3a, 4a are equally spaced but staggered provided with a triangular pattern, the holes being adjacent Lines 7a, 8a, 9a and columns 10a, 11a, 12a are each offset from one another by half a division.

In the case of the loudspeaker screen Ib according to FIG. 3, the holes are 2b, 3b, 4b in the same pitch, but diagonally offset Series provided so that there is a greater distance between adjacent holes compared to FIG. 2.

While in the embodiments according to FIGS the size of the holes from all the outer edges of the speaker

»Ti I

lit 1 1

aperture increases towards the center, the arrangement according to Fig. 4 is provided so that the size of the holes 2c, 3c, 4c only from the two longer outer edges 5c of the Orifice plate Ic to the center. increases, while the Size of all holes in the respective row 7c or 8c or 9c is the same. Similar to training According to Fig. 1, the perforation is also provided with the same pitch and in a straight line in this embodiment.

The loudspeaker cover Id according to FIG. 5 has a perforation in which the size of the holes 2d, 3d, 4d also only increases from two opposite outer edges 5d in the direction of the center, but here a diagonally offset row similar to FIG. 3 is provided.

Claims (18)

A 32 871 - raU the claims: 1. Loudspeaker bezel with an outer edge and a center as well as a plate-shaped over the, be Isweise formed aperture in particular holes distributed in a grid-like manner, characterized in that closer Holes (4) located at the center of the diaphragm (1) are larger than holes (jj or 2) further away. 2. Aperture according to claim 1, characterized in that the size of holes (2 to 4) to the center of the Aperture O) increases in several steps. 3. Cover according to claim 1 or 2, characterized in that that all holes (2 to 4) are increasingly larger towards the center of the diaphragm. 4. Aperture according to one of the preceding claims, characterized in that the size of holes (2 to 4) of at least two opposite sides of the center of the aperture (l) increases to this center. 5. Aperture according to claim 4, characterized in that the size of holes (2 to 4) of two parallel Outer edges, preferably the two longer outer edges (5) of the aperture (Ί) increases towards the center. 6. Aperture according to one of the preceding claims, characterized in that the size of holes ⁽ 2 to 4) increases from all outer edges (5, 6) to the center of the aperture (l). . Screen according to one of the preceding claims, characterized characterized in that a center field of the diaphragm. (1) several holes (4) having the same size in two mutually transverse directions side by side. 8. Cover according to one of the preceding claims, characterized in that holes (2 or 3 or 4) of the same size are provided in perforated rings around the center, the perforated rings preferably parallel to the outer edges (5, 6). the aperture ^f l ") run. 9. Cover according to one of the preceding claims, characterized characterized in that the axial spacing of adjacent holes (2, 3, 4) of different sizes, in particular of all neighboring holes is about the same. 10. Aperture according to any one of the preceding claims, characterized characterized in that the center distance of adjacent holes is different, preferably with the webs between adjacent holes are of the same width. 11. Screen according to one of the preceding claims, characterized in that the holes (2, 3 * ² O in, in particular parallel, rows (7, 8, 9) .and rectangular, in particular parallel columns UO, 11, 12) are provided are. 12. Aperture according to claim 11, characterized in that the common axial plane of the holes (2 or 3 or 4) at least one row, in particular all rows, at least with the common axial plane of the holes a column, in particular all columns in the Actes each one of the holes of the associated column cuts (cut). 13 · Cover according to claim 11 or 12, characterized in that that the holes (2a, 3a, 4a) of adjacent rows (7a, 8a, 9a) and / or columns (10a, 11a, 12a) are provided offset from one another, preferably offset by half the hole pitch. 14. Aperture according to one of the preceding claims, characterized in that the holes (2a, 3a »4a) are offset Strings with a triangular pattern are provided. 15 · Screen according to one of the preceding claims, characterized in that the holes (2b, 3b, 4c) in diagonally staggered rows are provided. l6. Aperture according to one of claims 11 to 15 »thereby. indicates that essentially all holes (2c or 3c or 4c) ^v of rows (7c or 8c or 9c) ^N and / or columns are of the same size. 17 · Cover according to one of claims 11 to 14, characterized in that that the holes (2) located at the ends of rows (8 or 9) or columns (11 or 12) are smaller than the remaining holes (3 or 4) of the respective associated 3 cases or gaps, which are preferably one below the other are the same size. 18. Aperture according to one of claims 11 to 17 »marked thereby t that. alternating lines (8b) - respectively. • · ■ ι .. -
• f ι;
Ii ₁ ;
* marked that the holes are circular, [Q Lines - (9b) Columns (lib) with holes of the same size and the end up or columns (12b) with smaller holes are provided. there- 19 panel according to one of the preceding claims, long- by angular as well as square or similar around, are. 721538Ί20.7.72