JPS6347399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm structure for a flat-plate speaker that has increased surface rigidity and does not produce distorted sound during vibration.

An example of a general flat-plate speaker is shown in Figure 1~
There is something like the one shown in Figure 3.

In the figure, reference numeral 1 is a diaphragm, and the diaphragm 1 is a thin plate with a large number of bulging semicylindrical protrusions 2 arranged side by side.
It is integrally formed by vacuum forming or the like, leaving a planar peripheral edge 3 around it. A voice coil C is wound around the protrusion 2.

The diaphragm 1 is a pair of upper and lower bellows-shaped supports that are respectively attached along the opening edge 5a between the opening edge 5a of the frame 5 attached to the base plate 4 and the base plate 4. It is clamped and fixed between members 6a and 6b. Reference numeral 7 designates a large number of magnets attached to the base plate 4, located below each protrusion 2 of the diaphragm 1, and an iron plate 8 is provided above the magnet 7 to concentrate magnetic flux. 9
10 is a lead wire connected to the voice coil C. A large number of holes are provided on the base plate 4 to allow air to move between the diaphragm 1 and the base plate 4. 10 is a lead wire connected to the voice coil C.

When a sound current is passed through the voice coil C, the flat speaker configured in this manner causes the diaphragm 1 to vibrate and generate sound waves, thereby functioning as a speaker.

However, in the diaphragm 1 formed by arranging a large number of semicylindrical protrusions 2 in parallel, the surface of each protrusion 2 is smooth, so the surface rigidity of each protrusion 2 is low, and therefore the surface of the entire diaphragm is Since the rigidity is low, there is a problem that, during vibration, a certain part of the diaphragm 1 may bend along the direction in which the protrusions 2 are arranged, causing distorted noise.

For this reason, there has been a demand for a diaphragm that increases the surface rigidity of each protrusion of the diaphragm itself and increases the surface rigidity of the entire diaphragm.

The present invention meets these demands by providing a plurality of peaks and valleys alternately and sequentially in the longitudinal direction on each protrusion of the diaphragm, and between adjacent peaks, one peak overlaps the other peak. The purpose of the present invention is to solve the above problem by forming a curved trough that penetrates into the trough.

The present invention will be explained below based on the drawings.

FIG. 4 is a diagram showing a first embodiment of the invention.

In the figure, reference numeral 11 denotes a diaphragm, and the diaphragm 11 is a thin plate with a large number of bulging protrusions 12 arranged side by side, and is integrally formed by vacuum forming with a flat peripheral edge 13 left around the periphery. Voice coil C is installed on the protrusion 12.
is wrapped around.

Each protrusion 12 of the diaphragm 11 is provided with a plurality of peaks 14 in the shape of a hipped roof in sequence in the longitudinal direction of the protrusion 12. In addition, the mountain portions 14, 14 adjacent to each other
A curved valley portion 15 is formed in which one peak portion 14 enters the other peak portion 14 between them. Although some of such protrusions 12 are omitted in the figure, a large number of these protrusions 12 are arranged in parallel over the entire surface of the diaphragm 11. These troughs 15 are arranged so as to be continuous in a sawtooth shape in the direction in which the protrusions 12 are lined up in all the protrusions 12 that are arranged in parallel.

Note that the curved shape of the valley portion 15 is not limited to a broken line as shown in the figure, but may be a curved line such as a U-shape.

In addition, as a modified example of the mountain portion 14, the top portion is flattened as shown in FIG. 7, and a new surface 16 is formed.
has been added to further improve surface rigidity.

Next, the action will be explained.

When the diaphragm 11 vibrates by passing sound current through voice coils C that are arranged in parallel on the diaphragm 11 and are wound around the ridges 12, for example, when the diaphragm 11 vibrates, each ridge 12 has peaks 14 and troughs 15 in the longitudinal direction. A plurality of curved troughs 15 are formed in sequence between adjacent peaks 14, 14, where one peak 14 enters the other peak 14, thereby increasing the surface rigidity of each protrusion 12 itself and the entire surface rigidity. Since it is raised, the surface of the diaphragm 11 expands or contracts without being partially deformed. Therefore, no distorted sound is generated.

In this embodiment, the protrusion 12 shown in FIGS.
Although an example is shown in which a large number of protrusions 12 are arranged in parallel on the diaphragm 11, it is of course possible to form a diaphragm in which the protrusions 12 shown in FIGS. 4 and 7 are appropriately combined. It is.

A second embodiment is shown in FIGS. 8 to 10.

In this embodiment, each protrusion 22 of a diaphragm 21 having a planar peripheral edge 23 on its periphery is provided with a plurality of peaks 24 in the shape of a hipped roof, alternating with troughs 25 in the longitudinal direction of the protrusion 22. The adjacent mountain part 24
A curved trough 25 is formed in between, where one peak 24 enters the other peak 24. The diaphragm 21 is formed by arranging a large number of such protrusions 22 in parallel at the positions omitted by the two-dot chain lines. In this point, it is the same as the first embodiment, but in this embodiment, as shown in FIG. 9 and FIG.
The positions of the protrusions 22, 22 that are adjacent to each other are offset in the direction in which the protrusions 22 are lined up, and the protrusions 22 are disposed discontinuously as a whole.

In this embodiment, the troughs 25 of adjacent protrusions 22, 22 are arranged discontinuously so as to be different from each other in the direction in which the protrusions 22 are arranged, thereby further increasing surface rigidity than in the first embodiment.

As explained above, according to this invention,
The configuration is such that each protrusion of the diaphragm is provided with a plurality of peaks and valleys alternately in the longitudinal direction, forming a curved valley where one peak enters the other peak between adjacent peaks. Therefore, the surface rigidity of each protrusion of the diaphragm itself is increased, and even if the valleys match the direction in which the protrusions are arranged, the valleys are not straight but serrated, so the overall surface rigidity is also increased. Therefore, when the diaphragm vibrates, no large deformation occurs in a part of the diaphragm, so that no distorted sound is produced.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a general flat-plate speaker, Figure 2 is a vertical cross-sectional view of the same flat-plate speaker with other parts cut away, Figure 3 is a perspective view showing the diaphragm of the flat-plate speaker, and Figure 3 is a perspective view showing the diaphragm of the flat-plate speaker. FIG. 4 is a plan view showing the diaphragm structure of a speaker according to the first embodiment of the present invention, FIG. 5 is a cross-sectional view taken along the line - - of FIG. 4, and FIG.
7 is a plan view showing different shapes of peaks formed on the protrusions of the diaphragm structure of the same flat-plate speaker, and FIG. 8 is a diagram of a flat-plate speaker according to a second embodiment of the present invention. A plan view showing the diaphragm structure, FIG. 9 is a cross-sectional view taken along the line -- in FIG. 8, and FIG. 10 is a cross-sectional view taken along the line -- in FIG. 6. 11, 21... diaphragm, 12, 22... protrusion,
14, 24...Yamabe, 15,25...Tanibe.

Claims (1)

[Scope of Claims] 1. A diaphragm structure of a flat plate speaker in which a large number of bulging protrusions around which a voice coil is wound are arranged in parallel on a thin plate, leaving a planar peripheral portion around the bulges, wherein each of the protrusions A flat plate characterized in that a plurality of peaks and valleys are provided alternately and sequentially in the longitudinal direction of the strip, and a curved valley is formed between the adjacent peaks so that one peak enters the other peak. type speaker diaphragm structure.