JPH0354477Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Field of industrial application) The present invention relates to a dome-shaped speaker, and in particular to a dome-shaped speaker that can simplify the assembly process and improve performance. be.

(Prior Art) A conventional dome-shaped speaker is constructed as shown in the sectional view of FIG. In the figure, numeral 30 is an external magnetic circuit section, which includes a yoke 31, a center pole 32, a magnet 33, and a top plate 3.
Each member is fixed with adhesive, but when forming the gap 35, a jig having a cylindrical portion corresponding to the gap is fitted onto the center pole 32, and the top plate 34 is fixed by adhesive. are doing. 40 is a vibration system, and a dome-shaped vibration 41
There is one in which the coil bobbin part 42 is integrally formed and a curved edge part 43 is separately adhered thereto, and another in which the dome-shaped diaphragm 41 and the edge part 43 are integrally formed and the coil bobbin part 42 is adhered thereto. . When assembling, the outer periphery of the edge portion 43 is placed between the damper members 37, 37 so as to be sandwiched between the mounting step portion 36 formed on the top plate 34, and thereby the voice coil 44 is attached to the gap 35.
Although the voice coil is placed at a predetermined position within the gap and covered with the frame 50, a jig is also used when incorporating the diaphragm so that the voice coil is placed at a predetermined position within the gap.

(Problems to be solved by the invention) In the conventional dome-shaped speaker shown in Fig. 3 mentioned above, various jigs are used in each assembly process.
Because it is necessary to set a clearance to pull out these jigs after the adhesive has hardened, these clearances, dimensional tolerances of each part, and work variations can lead to cumulative errors that can cause gap gaps to become large or incorrect. This became uniform and became a factor in performance deterioration. Furthermore, in conventional dome-shaped speakers, since adhesives are used to fix each member, time is required for the adhesives to dry and solidify, resulting in time loss in the assembly process.

We have previously proposed a dome-shaped speaker and various related structures that solve the above-mentioned conventional drawbacks and can be easily assembled without using assembly jigs or adhesive means. It is as shown in FIG.

That is, the dome part 11, the coil bobbin part 12, and the edge part 13 extending horizontally from the lower end thereof are integrally molded, and the coil bobbin part 12
A voice coil 14 is formed on the edge part 1 to constitute the vibration system 10, and this is incorporated into the magnetic circuit 20.
3 is held between edge press members 15 and 16 made of a flexible material such as foamed urethane. In the figure, 23 is a magnet, 24 is a top plate, a step 25 is provided on the inner periphery, and a guide ring 26 is fitted between this step and the outer periphery of the pole portion 22 of the yoke 21. Stepped portion 25
A magnetic pole ring 28 made of a magnetic material is arranged to form a magnetic gap 27, and between the magnetic gap 27 and the guide ring 26, the edge holding member 1 is disposed.
5 and 16 sandwich the edge portion 13. 29 is a frame.

In this type of dome-shaped speaker, the shape and structure of the guide ring are extremely important in order to form a magnetic gap and accurately guide the edge of the diaphragm.

An object of the present invention is to improve this type of dome-shaped speaker from this point of view, and to provide a dome-shaped speaker that is easier to assemble.

"Structure of the invention" (Means for solving the problems) A dome-shaped speaker according to the invention includes a dome-shaped diaphragm, a coil bobbin part, and an edge part extending horizontally from the lower end of the diaphragm. In a dome-shaped speaker in which a system is incorporated into a magnetic circuit part, as a guide ring member to be arranged to regulate the magnetic circuit constituent members when forming the magnetic cap and to guide the edge part when arranging the vibration system.
It is formed into a substantially step-like shape by an outer peripheral flat part, a vertical part continuous thereto, and an inner peripheral flat part extending horizontally from the vertical lower end, and the outer peripheral flat part is held between the magnet and the top plate. The inner edge of the inner peripheral flat portion is brought into contact with the outer periphery of the yoke pole portion.

(Function) When assembling the magnetic circuit, with the magnet placed on the yoke, fit the inner edge of the inner flat part of the guide ring member to the outer periphery of the pole part, and place the outer flat part on the magnet. , the edge portion of the vibration system is sandwiched between edge pressing members and the edge portion is disposed on the inner peripheral flat portion. In this state, the top plate is placed and the flat outer peripheral portion is held between the magnet and the top plate. This allows a predetermined magnetic gap to be formed between the top plate and the pole portion.

The outer periphery of the edge part of the vibration system is guided by the inner surface of the vertical part of the guide ring member and is automatically centered and set, so that the voice coil is automatically set at a predetermined position within the gap, and a jig for setting the diaphragm, etc. etc., so there is no need to set unnecessary gap intervals, and the magnetic gap can be set so as to form the minimum gap necessary for the movement of the coil bobbin and voice coil. This makes it possible to increase the magnetic flux density and improve efficiency, and the gap formed as described above becomes uniform over the entire circumference, making the magnetic flux distribution uniform and reducing distortion etc. be able to.

In particular, since the guide ring member arranged in this manner is arranged so that its outer peripheral flat portion is sandwiched between the magnet and the top plate, there is no risk of it falling into the inside of the magnetic circuit.

(Example) An example of a dome-shaped speaker according to the present invention will be explained based on FIG. 1 showing a partially enlarged cross-sectional view, and the same parts as in FIG. Omitted.

In the figure, reference numeral 1 denotes a magnetic circuit section, which is composed of a yoke 2 having a pole section 3, a magnet 4, and a top plate 5. The vibration system 10 to be incorporated into this magnetic circuit section 1 has the same structure as that explained with reference to FIG.
1. The coil bobbin portion 12 and the edge portion 13 are integrally molded, and the voice coil 14 is also formed.

In the present invention, a guide ring member 6 is arranged for the purpose of regulating the magnetic circuit components when forming the magnetic gap 7 and guiding the edge portion 13 when arranging the vibration system 10. It is formed into a substantially step-like shape by a portion 6a, a vertical portion 6b continuous thereto, and an inner peripheral flat portion 6c extending horizontally from the vertical lower end, and the outer peripheral flat portion 6a is formed between the magnet 4 and the top plate 5. At the same time, the inner edge of the inner peripheral flat portion 6c is brought into contact with the outer periphery of the yoke pole portion 3.

An arrangement step 5a is formed on the inner peripheral side of the lower surface of the top plate 5, and the outer peripheral flat portion 6a of the guide ring member 6 is fitted into this arrangement step. It should be made as thin as possible so as not to interfere with the process, and its width should also be made as small as possible.

Next, to explain an assembly example, when assembling the magnetic circuit, the inner edge of the inner peripheral flat part 6c of the guide ring member 6 is fitted to the outer periphery of the pole part 3 with the magnet 4 placed on the yoke 2. At the same time, the outer peripheral flat part 6a is placed on the magnet 4, and the edge part 13 of the vibration system 10 is held between the edge holding members 15 and 16, and the edge part is placed on the inner peripheral flat part 6c. When the top plate 5 is placed in this state, the outer circumferential flat portion 6a fits into the placement step portion 5a and is held between the magnet 4 and the top plate 5.
As a result, a predetermined magnetic gap 7 can be formed between the top plate 5 and the pole portion 3.

Further, the outer peripheral end of the edge portion 13 of the vibration system 10 is guided by the inner surface of the vertical portion 6b of the guide ring member 6 and is automatically centered and set, so that the voice coil 14 is automatically set at a predetermined position within the gap 7. Since the guide ring member 6 arranged in this manner is arranged such that its outer peripheral flat portion 6a is sandwiched between the magnet and the top plate, there is no risk of it falling into the magnetic circuit.

"Effect of the invention" According to the dome-shaped speaker according to the invention, when assembling the magnetic circuit and arranging the vibration system, the guide ring member can accurately guide the assembly and facilitate assembly. In addition, since the outer peripheral flat part of the guide ring member is held between the magnet and the top plate, it has the advantage that it will not fall into the magnetic circuit, making it ideal for this type of dome-shaped speaker.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of essential parts showing an embodiment of a dome-shaped speaker according to the present invention. FIG. 2 is a cross-sectional view of the main parts of the dome-shaped speaker that we previously proposed, and FIG. 3 is a cross-sectional view of a conventional dome-shaped speaker. 1: Magnetic circuit section, 2: Yoke, 3: Pole section,
4: Magnet, 5: Top plate, 5a: Arrangement stepped portion, 6: Guide ring member, 6a: Flat outer periphery, 6b: Vertical portion, 6c: Flat inner periphery, 7: Magnetic gap, 10: Vibration system, 11 : Dome-shaped diaphragm part, 12: Coil bobbin part, 13: Edge part, 1
4: Voice coil.

Claims (1)

[Scope of Claim for Utility Model Registration] A dome-shaped speaker in which a magnetic circuit part incorporates a vibration system comprising a dome-shaped diaphragm, a coil bobbin part, and an edge part extending horizontally from the lower end of the dome-shaped speaker, A guide ring member is arranged to regulate the magnetic circuit constituent members during formation and to guide the edge portion when arranging the vibration system, and the guide ring member includes a flat outer peripheral portion, a vertical portion continuous to the flat portion, and a vertical portion extending from the lower end of the vertical portion. The flat part of the inner periphery extends horizontally to form a substantially step-like shape, and the flat part of the outer periphery is sandwiched between the magnet and the top plate, and the inner edge of the flat part of the inner periphery is connected to the outer periphery of the yoke pole part. A dome-shaped speaker characterized by being brought into contact with.