JPH0110071Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of the diaphragm attachment part of a horn speaker.

To explain a conventional general horn speaker with reference to FIG. A coil bobbin 7 around which a voice coil 6 is wound is disposed, a dome-shaped diaphragm 8 is coupled to the tip of the coil bobbin 7, and the outer periphery of the edge 9 of the diaphragm 8 is fixed to the front plate 3 by fixing rings 10, 10'. is fixed.

Further, reference numeral 11 denotes a back cover for blocking sound pressure on the back of the diaphragm 8 and protecting the vibration system components.The back cover 11 forms a back chamber 12 of a certain volume on the back of the diaphragm 8. Ru.

Furthermore, 13 is an equalizer, 14 is a sound path bored in the center pole 2, and 15 is a speaker horn connected to the back plate 4.

In a horn speaker with such a configuration,
The air gap 16 between the diaphragm 8 and the equalizer 13 acts as stiffness and forms an acoustic high-frequency cutoff filter, but the smaller the distance d between the diaphragm 8 and the equalizer 13, the smaller the volume of the air gap 16, and the stiffness becomes lower. It is well known that as the horn speaker becomes larger, the high cutoff frequency becomes higher and the reproduction bandwidth of the horn speaker becomes wider.

However, if this distance d is too small, the diaphragm 8 and equalizer 13 will come into contact with each other in the low range, producing noise. Therefore, the distance d is determined from a design standpoint that takes into account the playback bandwidth and allowable input required for the horn speaker. It is strictly regulated.

However, in actual horn speakers, it is difficult to maintain the distance d at an accurate value due to dimensional tolerances of various parts around the magnetic circuit and diaphragm, and it is difficult to maintain a product with stable performance. Therefore, in reality, a method is used in which a spacer 17 is inserted between the fixing rings 10, 10' and the three surfaces of the front plate, and the distance d is maintained at a specified value by adjusting the thickness or quantity of the spacer 17. , the adjustment was extremely time-consuming.

This invention is a horn speaker in which the mounting method of the diaphragm is improved in order to eliminate the drawbacks of the conventional example described above, and as shown in FIG. On the other hand, on the upper surface of the plate 20, a recess 22, an annular projection 23 (FIG. 3), or a positioning ring 24 (FIG. 4) having a threaded portion 21 on the inner circumferential surface for screwing with the fixing ring 18 is provided. The diaphragm is held in a predetermined position by screwing the fixing ring 18 into the recess 22 and the like.

The diaphragm of the horn speaker of the present invention is held in the magnetic circuit with the above-mentioned configuration, so to adjust the distance d, which greatly affects the characteristics, simply rotate the fixing ring in which the diaphragm is incorporated, and then use the adhesive All you have to do is to fix the fixing ring in the recess etc. using a method such as the above. Specifically, a relay terminal for the voice coil wire is provided on the fixing ring, and a signal current is applied to the fixing ring.
It is also possible to make adjustments while monitoring the characteristics, and it has an advantage not available with conventional structures in that horn speakers with stable characteristics and quality can be easily mass-produced.

[Brief explanation of the drawing]

Figure 1 is a half-sectional view of a conventional horn speaker.
FIG. 2 is a half-sectional view of the horn speaker of the present invention, and FIGS. 3 and 4 are half-sectional views of essential parts of other embodiments of the present invention. 2 is a center pole, 8 is a diaphragm, 14 is a sound path, 15 is a speaker horn, 18 is a fixing ring, 19 is a screw portion, 20 is a plate, 21 is a screw portion, 22 is a recess, 23 is an annular projection, 24 is a This is a positioning ring.

Claims (1)

[Scope of utility model registration request] In a horn speaker configured to introduce sound waves emitted from a dome-shaped diaphragm 8 into a speaker horn 15 via a sound path 14 formed in a center pole 2 of a magnetic circuit, the diaphragm 8 is connected to the magnetic circuit. A screw portion 19 is provided on the outer periphery of the fixing ring 18 to be attached, and a recess 22 for attaching the diaphragm is provided on the upper surface of the plate 20 of the magnetic circuit, the recess 22 having a screw portion 21 on the inner periphery to be screwed into the outer circumferential thread portion 19 of the fixing ring 18. , the fixing ring 18 is inserted into the recess 22.
A horn speaker characterized in that a diaphragm 8 is held in a predetermined position by screwing.