JPS58171197A - Dynamic loudspeaker - Google Patents

Abstract

PURPOSE:To improve an assembling property, by forming a frame by plastic and fitting a hole having approximately the same outer diameter as an upper york at the center of the frame, a step part locking and fixing the upper end surface of a magnet and a notched part oriented from the center to the periphery. CONSTITUTION:A diaphragm 22 is put on the frame 23 of a speaker and its position is fixed on the step part 24 in the diametrical direction. The frame 17 is fitted and fixed to/on the step part 42 of the speaker frame 23 and holds the periphery of the diaphragm 2. A lead plate 25 is adhered and fixed to/on the lower surface of the frame 17. The frame 17 is molded as one united body by injecting a plastic material comparatively stable at its size and provided with a center hole 27, a back blow hole 19 and a notched part 20. A voice coil 21 is adhered and fixed to/on the lower surface of the diaphragm 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an electrodynamic speaker, and in particular, to improving the dimensional accuracy of a magnetic gap and improving assembly.

This invention relates to an electrodynamic speaker with good workability.

Figure 1 shows the structure of a conventional electrodynamic type speaker. In the figure, the 11ri magnetic core is integrated with the lower yoke 2, 3 is a ring-shaped magnet, and the upper A yoke 4 is mounted to form an outer magnetic type magnetic circuit. 5 is a frame, which supports the periphery of the vibration f27, and
The voice coil 6 is fixed, and the lead terminal 9 of the voice coil passes through the entire back hole 10 of the frame and is connected to the lead board 8 provided on the lower surface of the frame. The frame 7 has a stepped portion 11 and locks the periphery of the lower yoke 2.

In ATI speakers, it is necessary to insert the voice coil into a narrow magnetic gap, and the design is designed to minimize manufacturing variations that contribute to this dimension.
Reducing the size of the voice coil is an important point, and from the viewpoint of assembly work, the electrical connection process from the voice coil wire terminal to the lead board occupies a large portion.

In FIG. 1, the assembly order is as follows: the voice coil 6 is fixed to the diaphragm to form a diaphragm unit, and the lower yoke 2 is attached to the frame 5. Magnet 5. The frame 5 is constructed by incorporating the upper yoke 4 to form a magnetic circuit unit, and finally fixing the diaphragm unit and the magnetic circuit. Since it is necessary to form the peripheral fixing utility part 12 in a complicated shape, it is more advantageous in terms of cost to form it from a plastic material by integral injection molding. However, plastic molded products generally suffer from heat shrinkage after molding and pressure differences depending on the shape, resulting in poor dimensional stability. For example, the inner diameter of the diaphragm fixing step 12 serves as a guide when the diaphragm 7 is attached, so the higher the dimensional accuracy, the less likely the voice coil will be displaced. The above-described dimensional fluctuation of the plastic molded product increases as its absolute value increases, and therefore, the inner diameter of the stepped portion 12 is also relatively large, resulting in poor accuracy.

Also, focusing on the diaphragm 7, the diaphragm 7 is formed by molding from cone paper or plastic sheet, but in order to obtain good vibration characteristics, it is formed into a cone shape and a corrugated edge portion around the periphery. It is normal to do so. 1st
When bending the diaphragm 7 shown in the figure, the dimensional accuracy of the bending is not very high, and therefore the outer diameter of the diaphragm 7 is also unstable.

For this reason, in order to insert the voice coil 6 into a narrow gap, visual position adjustment is required when attaching the diaphragm 7 to the frame 5, which is a very inefficient process. Regarding the processing of the lead wire 9, first, the voice coil 6 is fixed to the diaphragm 7, and then the lead terminal is pulled out in the outer circumferential direction along the lower surface of the diaphragm 7, and the adhesive generates the vibration @7. is fixed to the bottom surface of the Thereafter, when the diaphragm 7 and the frame 5 are fixed, the lead terminal 9 is passed through the back hole 1o of the frame and connected to the slope board 8 on the lower surface of the frame. In this case, it is necessary to pass the hole through, and the lead processing cannot be done all at once, and various processes must be carried out without the lead end being completely processed, making the intervening processes difficult to handle. From the above points, the present invention provides an electrodynamic speaker structure that facilitates obtaining dimensional accuracy of the magnetic gap and is also preferable from the viewpoint of assembly work.

FIG. 2 is a sectional view of the entire electrodynamic speaker according to the present invention, and FIG. 3 is a bottom half view of the diaphragm unit before the magnetic circuit unit is incorporated. The present invention is also characterized by the order in which each part is assembled, and all parts are assembled from the bottom in FIG.

The configuration will be described below in accordance with the assembly order.

The diaphragm 22 is made by heat-pressing a plastic sheet material such as polyethylene terephthalate and bending it into the cross-sectional shape shown in FIG. The vibration gi22 is placed on the speaker frame 23, and its position in the radial direction is locked by the stepped portion 24. The frame 17 is fitted into and fixed to the stepped portion 24 of the speaker frame 23, and clamps the periphery of the diaphragm 220. On the lower surface of the frame 17, there is an I
A J + do board 25 is fixed with adhesive. Frame 17
is integrally injection molded from a relatively dimensionally stable plastic material such as polycarbonate, and has a central hole 27 and a step 1.
8. It has a back hole 19 and a notch 20.

The voice coil 21 is formed into a hollow cylindrical shape 9 and is adhesively fixed to the lower surface of the diaphragm 22. During this installation, it is positioned and fixed using a jig that matches the diameter of the central hole 27 of the frame 7. Lead terminal 2 of voice coil 21
6 is processed as shown in FIG. That is, the frame 17 is provided with a notch 20 extending from the central hole 27 to the periphery, and using this notch 20, the lead terminal 26 is first guided in the peripheral direction along the lower surface of the diaphragm 22. Glued and fixed to the bottom of the frame. After that, the lead board 25 is soldered or welded through the notch 20 in 1. connected emotionally.

With the above configuration, the voice coil 21. Vibration plate 22, frame 17. The speaker frame 23 is integrated to complete a diaphragm unit.

On the other hand, magnetic circuit, upper yoke 16. @Stone 15. The lower yoke 13 having the magnetic core 14 constitutes a magnetic circuit unit.

The upper yoke 16 has a hollow disk shape, and its outer diameter is approximately the same as the diameter of the central hole 20 of the frame 17. A hollow ring-shaped magnet 15 having at least an outer diameter larger than that of the upper yoke 16 is adhesively fixed to the lower surface of the upper yoke 16 .

A lower yoke 13 is attached to the lower surface of the ring magnet 15, and the lower yoke 15 has a magnetic core 14 in the center.
The position of this magnetic core 14 is adhesively fixed using a jig so that it has a predetermined gap from the inner diameter of the upper yoke 16. Above is p.
1 magnetic circuit unit is assembled.

The magnetic circuit unit is incorporated into the lower surface of the diaphragm unit, and the center hole 20 of the frame 17 and the outer diameter of the lower yoke 16 fit together, and the outer peripheral end of the magnet 15 is connected in the thickness direction by the stepped portion 18 of the frame 170. and is fixed by adhesive on the locking surface.

The present invention i is assembled with the shape as described above, the voice coil 21 is inserted into the gap of the magnetic circuit, and the voice coil is driven by an electric signal supplied from Motoya Reed to operate as an electrodynamic speaker. It is something.

The features of this application are that the dimensional accuracy of the magnetic gap is improved;
Also, by improving the processing of the lead terminals, the ease of assembling the entire speaker is significantly improved.

First of all, improving dimensional accuracy, the important point is the upper yoke 16
and the magnetic gap between the magnetic core 14 and the relative position of the voice coil 21. In the present invention, the hole diameter of the central hole 20 of the frame 17 is set as a reference, and the fluctuation factors that contribute to variations are reduced. Rearrangement of voice coil 21:
At the time of attachment, the central hole 20 of the frame 17 can be used, and this dimension is smaller in absolute value than the inner diameter of the stepped portion 12 of the frame 5 shown in FIG. 1 and the outer diameter of the diaphragm 7. , the dimensional variation @ during manufacturing can be reduced. In Fig. 1, the relative position between the voice coil 6 and the magnetic gap @V
C is the outer diameter of the swing-in plate 6 Z, the diameter of the support part of the frame 5, and its eccentricity S the diameter of the support part of the upper yoke 4 of the frame 5 The inner diameter of the upper yoke 5 , the position of the voice coil relative to the outer diameter of the recording head 6 makes a big difference! However, in this application, & the central hole diameter 7 of the frame 17, the voice coil 2 for the central hole diameter of the frame 17.
1 is installed at position a.The inner and outer diameter dimensions of the upper yoke are smaller.

In particular, in the conventional diagram, 1 and 2.5 are large fluctuation factors, but in the present application, the larger 7 is [7C'.

The absolute value is greatly reduced. That is, voice coil 1
This is because the hole diameter of the center hole 20 of the frame can be used as a reference when installing the hole 6, and since this hole diameter is highly accurate,
The accuracy of the installation is also high, which causes significantly less variation overall. Therefore, as a result, fine adjustment of the position during assembly becomes unnecessary, and the efficiency can be improved or the size of the magnetic gap can be reduced, contributing to an improvement in the efficiency of the speaker.

Next, regarding the improvement of assembly workability, in this application,
Since the lead skin end 26 is guided through the notch 20, it is easier to guide the lead skin end 26 than through the conventional back hole 10. In addition, since the lead terminals are fixed in the same process after the voice coil 21 is fixed to the diaphragm 22, there is no longer a situation where the lead terminals are left unprocessed and floating. No consideration is required.In other words, the frame 17.diaphragm 22.voice coil 21 [in the combined state, it can flow in the process, the delicate voice coil,
Since the diaphragm is integrated with the Nb-based frame, rough handling is possible. Further, according to the present application,
Speaker frame 25. Vibration plate 22゜7L/-mu 217,
Q-do board 25. Voice coil 21, magnetic circuit in this order,
Everything can be assembled from the bottom, which not only makes the process more efficient, but also has the advantage of being advantageous when it comes to automation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional 111II type speaker, FIG. 2 is a sectional view of a simplified electric speaker according to the present invention, and FIG. S is a partial plan view of FIG. 2. 15...Lower yoke 14...Magnetic core 15...Magnet 16...Upper yoke 17...Frame 18... ... Frame center hole step part 19 ... Back hole 20 ... Notch 9 notch 21 ... Voice coil 22 ... Swing side 2S ... ...Speaker frame 24...Speaker frame stepped portion 25...Lead T5 plate 26...Lead terminal 27...More than the center hole of the frame Applicant Corporation Daini Seikosha

Claims (1)

[Claims] It consists of a disk-shaped upper yoke with a central hole, a lower yoke with a magnetic core, and a ring-shaped magnet placed between the lower yoke and the upper yoke. , an external magnetic circuit that forms a magnetic gap between the sides of the magnetic core, a voice coil inserted into the magnetic gap, a diaphragm to which the voice coil is fixed, a diaphragm that supports the periphery of the diaphragm, and the magnetic circuit. In an electrodynamic speaker comprising at least a frame to which is fixed, and a lead board attached to the frame, the outer diameter of the magnet is larger than the outer diameter of the upper yoke, and the frame is made of a plastic material. It is well-formed, and has a hole in the center having approximately the same outer diameter as the outer diameter of the upper yoke, a stepped portion for locking and fixing the upper end surface of the magnet, and a notch extending from the center hole to the peripheral portion, An electrodynamic speaker with a lead board attached to the bottom of the frame.