JPH023599Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Fields> The invention can be used, for example, in various watches, cameras, microwave ovens, calculators, portable devices, etc. video. tape. The present invention relates to an acoustic transducer used as a sound reporting component for a recorder or a pager.

<Prior art> As this type of acoustic transducer, electromagnetic or piezoelectric types are known, but in order to improve the sound pressure level and at the same time protect the acoustic transducer, a resonance box is installed in the acoustic transducer. It is common to insert a sound emitting cylinder. FIG. 1 is a diagram showing a conventional example of this type of acoustic transducer, in which an electromagnetic type or piezoelectric type acoustic transducer 2 is built inside a cylindrical outer case 1 made of synthetic resin, etc. The exterior case 1
It has a structure in which a cylindrical sound emitting tube 4 having a sound emitting hole 3 provided in the center of the upper surface is fitted into one end side of the body. The exterior case 1 and the sound emitting cylinder 4 are coaxially fitted together so that their outer peripheral surfaces are located on the same plane. Therefore, the outer case 1 and the sound emitting cylinder 4
There is no difference in level between the joints.

<Problem to be solved by the invention> As mentioned above, the outer case 1 and the sound emitting cylinder 4 are
Make sure that their outer peripheral surfaces are on the same plane,
In the conventional product that is coaxially fitted, there is no step between the inner and outer peripheral surfaces at the joint between the outer case 1 and the sound emitting tube 4, so that the radial shape of the sound emitting tube relative to the outer case 1 is The sound emitting cylinder does not change when the body 4 is connected, and can be made smaller by keeping the outer diameter to the shape of the outer case 1. There are advantages such as no misalignment, falling off, etc. of parts 4, improving reliability, and eliminating steps where moisture, dirt, etc. tend to accumulate, making it difficult for water to seep into the interior.

However, in the conventional example described above, the structure was such that the sound emitting cylinder 4 was simply fitted in a planar manner to one end surface side of the cylindrical outer case 1. The bond strength between 4 is weak,
There was a drawback that the sound emitting cylinder 4 could be misaligned, changing the sound emitting characteristics, or falling off. The above drawbacks can be solved by pouring adhesive into the joint surface A to fix the outer case 1 and the sound emitting tube 4, but in this case, there is a drawback that the assembly work becomes extremely troublesome.

Therefore, the problem of the present invention is to solve the problems while retaining the above-mentioned conventional advantages, and to easily and reliably assemble the outer case and the sound emitting cylinder without using adhesives or the like. The object of the present invention is to provide a highly reliable acoustic transducer.

<Means for Solving the Problems> In order to solve the above problems, the present invention has a method of fitting one end of the cylindrical part of the sound emitting cylinder to one end of the cylindrical part of the cylindrical exterior case in which the acoustic converter is built-in. In the acoustic transducer, the sound emitting cylinder and the exterior case are fitted in a concave-convex manner by utilizing their elasticity, and the concave portion and the convex portion constituting the concave-convex fitting are formed in a convex-concave manner. It is characterized in that it has bonding surfaces that are in close contact with each other on the upper surface side and the lower surface side when viewed in the matching direction, and the bonding surfaces on the upper surface side and the lower surface side are inclined and continuous.

<Function> Since the sound emitting cylinder and the outer case are fitted in a concave and convex manner using each other's elasticity, the sound emitting cylinder can be integrally connected to the outer case without using adhesives or the like. can. This makes assembly very easy.

Furthermore, since the concave portion and the convex portion constituting the concave-convex fitting have bonding surfaces that come into close contact with each other on the upper and lower surfaces when viewed in the fitting direction, play (backlash) in the fitting direction is eliminated. It is possible to obtain an acoustic transducer with excellent acoustic characteristics that does not generate rattling noise or the like due to rattling.

Moreover, the concave portion and the convex portion have bonding surfaces that are in close contact with each other on the upper surface side and the lower surface side when viewed in the fitting direction, and the bonding surfaces on the upper surface side and the lower surface side are connected at an angle. , the strength of the mating connection between the sound emitting cylinder and the exterior case is increased, and the adhesion is also increased, preventing the sound emitting cylinder from shifting or falling off, and can be easily removed from the joint surface without using adhesive. A highly reliable acoustic transducer that can reliably prevent water from entering can be obtained.

Furthermore, since the joint surfaces on the upper surface side and the lower surface side are inclined and connected, when cutting out the mold after molding the outer case and the sound emitting cylinder, it is possible to remove the mold in the fitting direction. Easy to pull out.

<Example> FIG. 2 is a front partial sectional view of an acoustic transducer according to the present invention. In the figure, the same reference numerals as in FIG. 1 indicate the same components. As shown in the figure, in the present invention, the outer periphery of one end of the cylindrical part constituting the exterior case 1 made of a suitable material such as synthetic resin, and the cylinder of the sound emitting cylindrical body 4 also made of synthetic resin etc. By forming substantially S-shaped uneven parts 101 and 41 on the inner periphery of one end of the part, respectively, and allowing the uneven parts 101 and 41 to fit closely together, the uneven parts 101 and 41 are made to fit into the uneven parts by utilizing their elasticity. , one end of the cylindrical portion of the sound emitting cylinder 4 is coupled to one end of the cylindrical portion of the outer case 1.

The uneven parts 101 and 4 forming the above-mentioned uneven fitting
1 has bonding surfaces that come into close contact with each other on its upper surface (b) and lower surface (c) when viewed in the fitting direction. The joint surfaces of the upper surface side B and the lower surface side C have uneven parts 101 and 41.
Since it has a substantially S-shape, it is continuous in a curved manner.

With such a structure, the sound emitting cylinder 4 can be integrally connected to the outer case 1 without using an adhesive or the like, making assembly very simple.

Moreover, since the uneven parts 101 and 41 have bonding surfaces that come into close contact with each other on the upper surface side B and the lower surface side C when viewed in the fitting direction, the respective bonding surfaces on the upper surface side B and the lower surface side C are It serves as a barrier surface against play (backlash) in the mating direction, prevents the occurrence of play, and provides an acoustic transducer with excellent acoustic characteristics that does not generate rattling noise or the like due to play.

Moreover, the uneven parts 101 and 41 have bonding surfaces that come into close contact with each other on the upper surface side B and the lower surface side C when viewed in the fitting direction, and the bonding surfaces on the upper surface side B and the lower surface side C are inclined. Because they are continuous, the strength of the fitting connection between the sound emitting cylinder 4 and the exterior case 2 is increased, and the adhesion is also increased, preventing the sound emitting cylinder 4 from shifting or falling off, and using adhesive. A highly reliable acoustic transducer that can reliably prevent water from seeping through the joint surfaces can be obtained without having to do anything.

Furthermore, since the joining surfaces of the upper surface side B and the lower surface side C are inclined and connected, when cutting out the mold after molding the outer case 2 and the sound emitting cylinder 4, it is possible to pull out in the fitting direction. Therefore, the die-cutting work is easy.

In addition to the above embodiments, the concave-convex fitting structure includes:
As shown in FIG. 3, an annular convex portion 41 and an annular concave portion 10
A structure such as concave-convex fitting with 1 is conceivable.

FIG. 4 shows an example in which the present invention is applied to an electromagnetic acoustic transducer. A cylindrical permanent magnet 8 is arranged so as to surround the electromagnet consisting of the coil 5 and the iron core 6, and is further placed in the upper opening of the outer case 1 with a gap G between it and the tip end surface 61 of the iron core 6. It has a structure in which opposing disc-shaped diaphragms 9 are mounted. Then, an uneven portion 101 is formed on the outer periphery of the upper end of the exterior case 1, and the uneven portion 10
1, an uneven portion 4 formed on the inner surface of the sound emitting cylinder 4
It has a structure in which 1 is fitted in a concave and convex manner. 10 is a printed circuit board attached to the yoke 7 by adhesive or other means.

This electromagnetic acoustic transducer can be used for various watches, cameras,
Microwave, calculator, portable. video. tape. There is a tendency for parts to be made smaller and smaller as sound reporting parts for recorders or pagers, but the present invention eliminates the need for gluing, making assembly easier and improving reliability even when miniaturized. can be done.

<Effects of the invention> As described above, according to the invention, the following effects can be obtained.

(a) Since the sound emitting cylinder and the outer case are fitted in a concave and convex manner by utilizing their elasticity, the sound emitting cylinder can be integrally connected to the outer case without using adhesive or the like. It is possible to provide an acoustic transducer that can be easily assembled.

(b) Since the concave and convex portions that make up the concave-convex fitting have bonding surfaces that come into close contact with each other on the top and bottom sides when viewed in the mating direction, play (backlash) in the mating direction is eliminated. , it is possible to provide an acoustic transducer with excellent acoustic characteristics that does not generate rattling noise or the like due to rattling.

(c) The concave portion and the convex portion have bonding surfaces that come into close contact with each other on the upper surface side and the lower surface side when viewed in the mating direction,
Since the joint surfaces on the upper surface side and the lower surface side are inclined and connected, the strength of the fitting connection between the sound emitting cylinder and the exterior case is increased, and the adhesion is also increased, preventing the position of the sound emitting cylinder from shifting or Falling off etc. is prevented,
It is possible to provide a highly reliable acoustic transducer that can reliably prevent water from seeping through the bonded surfaces without using adhesives.

(d) Since the joint surfaces on the upper surface side and the lower surface side are inclined and connected, when cutting out the mold after molding the outer case and the sound emitting cylinder, it is possible to pull out in the fitting direction, It is possible to provide an acoustic transducer that can be easily cut out.

[Brief explanation of drawings]

Figure 1 is a front partial sectional view of a conventional acoustic transducer.
FIG. 2 is a front partial cross-sectional view of the acoustic transducer according to the present invention, FIG. 3 is a cross-sectional view of main parts of another example of the acoustic transducer according to the present invention, and FIG. 4 is an electromagnetic acoustic transducer according to the present invention. FIG. 3 is a front partial cross-sectional view of the transducer. 1...Exterior case, 2...Acoustic converter, 3...Sound emission hole, 4...Sound emission cylinder.

Claims (1)

[Claims for Utility Model Registration] An acoustic transducer in which one end of a cylindrical part of a sound emitting cylinder is fitted into one end of a cylindrical part of a cylindrical exterior case in which an acoustic transducer is built-in, comprising: The sound emitting cylinder and the outer case are fitted in a concave-convex manner by utilizing their elasticity, and the concave portions and convex portions forming the concave-convex fitting are located on the upper surface side and the lower surface side when viewed in the fitting direction. An acoustic transducer, characterized in that the acoustic transducer has bonding surfaces that are in close contact with each other, and the bonding surfaces on the upper surface side and the lower surface side are connected to each other in an inclined manner.