JP3063800U - Electromagnetic converter - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In an electromagnetic transducer, a spring suspension for generating vibration is liable to be distorted due to generation of harmonics or abnormal vibration from a mounting portion, and has elasticity and damping properties in place of this. Means and a mounting method with high vibration transmission efficiency became necessary. SOLUTION: The foaming resin (sponge) 15 shown in FIG. 1 which replaces the suspension springs 3 and 7 shown in FIGS.
Filling the space opposite to the above, and strongly bonding the metal substrate 11 to the panel or casing with epoxy 14 or the like.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a structure of an electromagnetic transducer that generates a wide-range vibration from a low-frequency vibration to a high-frequency vibration.

[0002]

[Prior art]

 The conventional wide-range vibration generating electromagnetic converter has a structure in which a magnet 2 with a yoke 1 is suspended on a case 4 by a spring 3 as shown in FIG. 2 or a mounting board 6 of a coil 5 by a spring 7 as shown in FIG. An armature coil (hereinafter simply referred to as a coil) 5 is mounted on the diaphragm 8 as shown in FIG. 2 or a printed circuit board on which the coil 5 is mounted as shown in FIG. 6 was further attached to a panel or a housing 10 by screws 9.

[0003]

[Problems to be solved by the invention]

 In the above-mentioned conventional electromagnetic converter, the suspension of the spring for generating low-frequency vibration is liable to generate harmonics and abnormal vibration from the mounting part, and the necessary damper is difficult to add due to miniaturization. No effect was obtained, and when the panel or housing was tightened with screws or the like, abnormal vibrations were generated due to gaps, and the transmission efficiency of vibrations was reduced. For this reason, a means having elasticity to replace the spring suspension and damping properties to replace the damper and a mounting method with high transmission efficiency are required.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the electromagnetic converter according to the present invention, as shown in FIG. 1, uses a metal substrate 11 as a substrate and strongly adheres it to a panel or a housing with an epoxy 14 or the like without gaps to increase the transmission efficiency of wide-range vibration. At the same time, the low-frequency vibration is enhanced by the mass effect of the metal substrate 11, and the suspension springs 3, 7 of the magnet 2 with the yoke 1 for low-frequency vibration shown in FIGS. Filling the opposing space with the resin (sponge) 15 provided a damper effect on higher harmonics, and low-frequency vibrations in the central axis directions 16 and 17 with no abnormal vibration with small distortion were obtained.

[0005]

[Embodiment]

 The embodiment of the invention will be described with reference to the drawings. In FIG. 1, the material of the metal plate 12 is selectively aluminum-based, copper-based, or iron-based. The printed circuit sheet 13 is attached to the metal plate 12 and the cylindrical coil 5 is attached thereto. The magnet 2 with the yoke 1 is opposed to the metal plate 12 with a movable gap. In this case, the conventional metal springs 3 and 7 shown in FIGS. 2 and 3 tend to cause abnormal vibration at the mounting portion thereof. Silicon or urethane foam resin (sponge) 15 is filled and integrated into the opposing space, and low frequency vibration is adjusted by adjusting the natural vibration by the large mass of the magnet 2 with the yoke 1 and the elastic property of the filling sponge 15. Frequency vibration mass of the coil 5 and the metal substrate to the mass of the yoke 1 with the magnet 2 is higher natural vibration by the elasticity of the sponge 15 is obtained because very small. In any case, vibration with small distortion can be obtained by suppressing harmonics by the sponge damper effect. When this electromagnetic transducer was strongly bonded to a metal substrate on the housing of a portable device, and a wide range of oscillating current was applied to the coil, vibration with low distortion from low to high frequency was obtained. Example 100-115dB 100Hz 100gr 0.6G for 100-1000Hz

[0006]

【Example】

 FIG. 1 shows an embodiment of the present invention, in which a cylindrical coil 5 is mounted on a metal substrate 11 comprising a metal plate 12 and a printed circuit sheet 13 adhered thereto. This is an electromagnetic transducer that fills a space with a foamed resin (sponge) 15 and generates vibrations 16 and 17 in the central axis direction.

[0007]

[Effect of the invention]

 By the present invention, vibrations with small distortion and no abnormal noise can be obtained by suppressing the generation of harmonics in the wide-range vibration, and sound is generated by adhering to the panel or casing, and the natural vibration in the low-range vibration is vibrated. The application as a rater was enabled. Furthermore, filling with foamed resin (sponge) facilitated the miniaturization and mass production of equipment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the electromagnetic converter of the present invention.

FIG. 2 is a sectional view of a conventional electromagnetic (vibration sound generation) converter.

FIG. 3 is a sectional view of a conventional electromagnetic converter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke 2 Magnet 3 Spring 4 Case 5 Armature coil, (easy) coil 6 Printed circuit board 7 Spring 8 Diaphragm 9 Screw 10 Housing 11 Metal substrate 12 Metal plate 13 Printed circuit sheet 14 Epoxy 15 Foam resin (sponge) 16 Central axis Direction Up 17 Central axis direction Down

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[Procedure amendment]

[Submission date] May 31, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (1)

[Utility model registration claims] A cylindrical armature coil is mounted on a metal substrate on which a printed circuit sheet is adhered to a metal plate, and a magnet with a yoke is opposed to the armature coil. An electromagnetic transducer that generates a wide range of vibration.