JPH0528198U - Thin dome speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] The speaker shape is made thin and the energy of vibration resonance is absorbed to improve the reproduced sound quality of the speaker. [Structure] A structure in which the internal space of the diaphragm communicates with the space provided outside the frame.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a thin dome type loudspeaker mainly used for mounting on a vehicle, which can be easily housed and mounted by a structure having a small height.

[0002]

[Prior Art]

 As shown in the cross-sectional view of FIG. 5 and the plan view of FIG. 6, the structure of a conventional dome-shaped speaker of this type is a circle formed by an inner magnet type magnetic circuit (04) incorporating a permanent magnet (02). A voice coil (08) attached to the tip of a dome-shaped diaphragm (03) is suspended in the ring-shaped magnetic air gap (04a), and the frame (07) is attached to the edge (03e) formed on the outer edge of the diaphragm (03). ), And the upper edge of the outer frame (01) is pressed against the packing (05) to support it. Then, the space (03a) between the inner surface of the diaphragm (03) and the center pole (04b) was filled with the sound absorbing material (03b), and the air vent hole (04c) drilled in the center of the magnetic circuit (04). ), A sound absorbing material (09b) such as cotton is packed in a cover (09) covering the rear surface of the magnetic circuit (04).

Therefore, with such a configuration, the standing wave vibration of the vibrating plate (03) generated by the vibration of the vibrating plate (03) transfers the energy of resonance to the sound absorbing material (03b) of the space (03a). , And the sound absorbing material (09b) in the space (09a) occupying the inside of the cover (09) suppresses, absorbs, and cancels, so that peaks and dips due to vibration resonance are eliminated and the sound quality of the reproduced sound of the speaker is eliminated. Good effect.

[0004]

[Problems to be solved by the device]

 However, the conventional dome-type speaker with such a structure requires a considerably large space and a large volume of sound absorbing materials (03b) and (09b). In order to obtain a large product, the height (oh) is inevitably increased, and even if a magnet with a thin shape is used, such as a neodymium magnet, which has a large coercive force, the height (oh ) Becomes bulky, making it difficult to store and install as an in-vehicle speaker.

Therefore, in order to solve the problem of the conventional dome-shaped speaker having such a structure, the present invention proposes a space (07) outside the frame (07), which has not been considered as a dead space. In order to utilize 07a), the height of the cover is made low, a small thin space is maintained on the lower surface of the lower plate (04d) of the magnetic circuit (04), and the outer frame (01) is used. Also, the space (07a) is formed by expanding outward to the outer periphery of the frame (07), and through the inner side of the diaphragm (03) and the magnetic gap (04a), the space inside the diaphragm (03). (03a) is a thin dome type speaker having a configuration in which the space (03a) is enlarged and secured by communicating the space (07a) between the frame (07) and the cover. If necessary, a sound absorbing material (07b) may be packed and held in the rear surface of the lower plate (04d) of the magnetic circuit (04) and the rear space (07a). With the above configuration, it is not necessary to pack the sound absorbing material (09b) in the cover (09) with a high rear surface of the conventional magnetic circuit (04), and the speaker shape is made thin and the energy of vibration resonance is absorbed. The thin dome type speaker is intended to improve the playback sound quality of the speaker.

[0006]

[Means for Solving the Problems]

 The structure of the first invention for achieving the object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. It is slightly different from the lower surface side of the magnetic circuit (4) having the central hole (4c). In the speaker where the outer wall of the cover (9) that holds and covers the space of (7) is expanded to the outer periphery of the outer frame (1) to form the space (7a) below the frame (7), Hold a thin space (7c) between the lower plate (4d) of the circuit (4) and the inner space (3a) of the diaphragm (3) through the center hole (4c). The thin dome type speaker is configured to communicate with the space (7a) between the frame (7) and the cover (9) and expand and secure the space (3a). If necessary, the sound absorbing material (7b) is packed and held in the space (7c) on the rear surface of the lower plate (4d) of the magnetic circuit (4) and the space (7a).

The second invention of the present invention is that the cover (9) closely covers the lower surface side of the magnetic circuit (4) having the central hole (4c) in the sectional view of FIG. 3 and the plan view of FIG. In a speaker in which the outer wall is expanded outward to the outer periphery of the outer frame (1) to form a space (7a) on the lower outer side of the frame (7), the lower plate (4d) of the magnetic circuit (4) The inner space (3a) of the diaphragm (3) communicates with the space (7a) of the frame (7) by the slit (4e) communicating with the center hole (4c) formed on the lower surface of the frame (7). This is a dome-shaped speaker. If necessary, the sound absorbing material (7b) is packed and held in the slit (4e) on the rear surface of the lower plate (4d) of the magnetic circuit (4) and the space (7a).

[0008]

[Action]

 Since the first and second inventions have such a structure, the inner space (3a) of the dome-shaped diaphragm (3) is passed through the central air vent hole (4c) to the lower plate of the magnetic circuit (4). The space (7c) formed on the lower surface of (4d) or the space (7a) formed between the space (7c) and the outer periphery of the frame (7) can be communicated and expanded via a duct. The resonance energy can be absorbed by the sound absorbing materials (3b) and (7b).

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of the first invention, FIG. 1 is a sectional view thereof, and FIG. 2 is a plan view thereof. That is, (4) is an inner magnet type magnetic circuit in which, for example, a central hole (4c) incorporating a neodymium permanent magnet (2) is bored, and the center pole (4b) and the magnetic plate part (7d) of the frame (7) are The voice coil (8) attached to the tip of the tome-shaped diaphragm (3) is suspended in the annular magnetic gap (4a) formed by the edge (3e) formed on the outer edge of the diaphragm (3). It is attached to the frame (7) via the packing (5), and is pressed and supported by the inner edge of the outer frame (1) from above.

Therefore, the cover (9) covering the outside of the magnetic circuit (4) is provided with a space (7c) having a small thickness between the cover and the lower surface of the lower plate (4d) of the magnetic circuit (4). The outer space (7a) is formed by expanding the outer frame (1) to the outer periphery of the outer frame (1) and forming the space (7a) on the lower and outer sides of the frame (7). The thin dome type speaker has a structure in which the space (3a) is expanded and secured by communicating with the space (7a) between the frame (7) and the cover (9). If necessary, the sound absorbing material (7b) is packed and held in the spaces (7a) and (7c). With such a configuration, the space (3a) inside the diaphragm (3) is connected to the space (7c) below the lower magnetic plate (4d), the frame (7) and the cover through the air vent (4c). It is extended to the space (7a) between (9) and communicates.

A second invention is, in the sectional view of FIG. 3 and the plan view of FIG. 4, (4) is an inner magnet type magnetic circuit having a central hole (4c) in which, for example, a neodymium permanent magnet (2) is incorporated. Then, inside the annular magnetic gap (4a) formed by the center pole (4b) and the magnetic plate part (7d) of the frame (7), the voice coil (8) attached to the tip of the dome-shaped diaphragm (3) ), Attach it to the frame (7) via the packing (5) with the edge (3e) formed on the outer edge of the diaphragm (3), and press it from above with the inner edge of the outer frame (1). Support.

[0012] Then, the cover (9) covering the outside of the magnetic circuit (4) is placed in close contact with the lower surface of the lower plate (4d) of the magnetic circuit (4), and up to the outer periphery of the outer frame (1). A slit (4e) communicating with a central hole (4c) formed in the lower surface of the lower plate (4d) of the magnetic circuit (4) is formed by expanding outward to form the lower outer space (7a) of the frame (7). ), The inner space (3a) of the diaphragm (3) communicates with the space (7a) between the frame (7) and the cover (9), and the space (3a) is expanded and secured. Is a thin dome type speaker. If necessary, the space (7a) and the slit (4e) are filled with the sound absorbing material (7b) and held. With such a structure, the space (3a) inside the diaphragm (3) passes through the air vent hole (4c) and the slit (4e) on the lower surface of the lower magnetic plate (4d) to cover the frame (7). It is expanded and communicated with the space (7a) between (9).

The packing (5) can be omitted by attaching the upper surface of the diaphragm (3) of the first and second inventions to the lower surface of the inner edge of the outer frame (1).

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to only the structures of these embodiments, and includes the above-mentioned configuration requirements of the present invention, and The present invention can be carried out with appropriate modifications within the scope of achieving the object of the present invention and having the following effects.

[0015]

[Effect of the device]

 As is apparent from the above description, since the first and second inventions have such a structure, the height of the cover (9) is low and the neodymium magnet is used as the permanent magnet. By adopting this, the overall height (h) of the speaker can be reduced, and it can be easily stored and installed even in thin places such as automobile doors, which is not only convenient for handling, but also has a large volume in inventory. In addition to the effect that space can be utilized without needing, the inner space (3a) inside the dome-type diaphragm (3) can be connected to the space (7c) between the lower plate (4d) and the cover (9). Or, through the slit (4e), it can be expanded by communicating with the space (7a) formed between the outer lower surface of the frame (7) and the cover (9), and those spaces (3a), (7a) Also, the sound absorbing materials (3b) and (7b) in the slit (4e) absorb the resonance energy of the diaphragm (3), which also has the effect of improving the reproduction sound quality. It

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the first invention.

FIG. 2 is a plan view of an embodiment of the first invention.

FIG. 3 is a sectional view of an embodiment of the second invention.

FIG. 4 is a plan view of an embodiment of the second invention.

FIG. 5 is a sectional view of a conventional example.

FIG. 6 is a plan view of a conventional example.

[Explanation of symbols]

 (1) Outer frame (3) Vibration plate (3a) Space (4) Magnetic circuit (4c) Center hole (4d) Bottom plate (5) Packing (7) Frame (7a) Space (9) Cover (4e) Slit

Claims (2)

[Scope of utility model registration request] 1. An outer wall of a cover (9) for holding and covering a small space and a lower surface of a magnetic circuit (4) having a center hole (4c),
In the speaker in which the space (7a) outside the frame (7) is expanded to the outer circumference of the outer frame (1), the center hole (4c)
The space (3a) inside the diaphragm (3) through the frame
A thin dome type speaker having a structure communicating with the space (7a) of (7). 2. The outer wall of the cover (9), which closely covers the lower surface side of the magnetic circuit (4) having the central hole (4c) formed therein, is expanded outward to the outer periphery of the outer frame (1). Lower outer space (7a) of frame (7)
In the speaker formed with, the slit (4e) communicating with the central hole (4c) formed on the outer surface of the lower plate (4d) of the magnetic circuit (4) allows the inner space (3a) of the diaphragm (3). A thin dome type speaker having a structure in which the above is communicated with the space (7a) of the frame (7).