US 6,674,197 B2 · Electromagnetic sound generator

Abstract

An electromagnetic sound generator is proposed that can be easily and inexpensively fabricated for producing an indicating sound to enable use in an automobile or other similar environment. A spool (2) on which a coil (3) has been wound, a core (4) that is movable up and down, and a round spring (5) are installed inside a cup-shaped yoke (1); whereby supplying or cutting off the supply of current to the coil (3) causes the core (4) to strike, in single beats in accordance with drive, against the yoke (1) itself or on the side of spring (5) to produce a sound. The yoke (1), which is the magnetic circuit for driving, also serves as a sound generator, and the provision of openings such as slits in the upper surface and side surfaces of the cup-shaped yoke (1) enhances sound effects such as the tone, volume and direction of emission of the generated sound. When converting a directional indicator for an automobile to electronic circuits, the present invention enables the production of a sound for checking operation of the directional indicator that resembles the sound of a relay-type directional indicator.

Claims17

Dependent claims

An electromagnetic sound generator comprising:

a cup-shaped yoke;
a spool on which a coil is wound, said spool having a hole through its central portion and being installed so as to contact the inner surface of said yoke;
a spring having an edge that is secured to the edge of the open end of said yoke;
a core that is constituted by a cylindrical main body part and a plate part that is formed on the lower side of said main body part, said main body part being inserted inside said hole through said spool and being movable up and down inside said hole, the lower surface of said plate part being secured to the central portion of said spring, and said core being movable up and down as a unit with the central portion of said spring;
and
a back plate that limits displacement in the direction of the lower surface of said core;
wherein attractive force causes said core to strike said yoke when current is conducted to said coil, and resilience of said spring causes said core to strike said back plate when current is cut off;
thereby producing sound.

5 more elements

An electromagnetic sound generator, comprising:

a cup-shaped yoke;
a spool on which a coil is wound, that has a hole through its central portion, and that is installed so as to contact the inner surface of said yoke;
a spring having an edge that is secured to the edge of the open end of said yoke and having at least one protrusion that protrudes from the edge toward the central portion;
and
a core that is constituted by a cylindrical main body part and a plate part that is formed on the lower side of said main body part, that is inserted inside said hole through said spool and that is movable up and down inside said hole, the lower surface of said plate part being secured to the central portion of said spring, said core being movable up and down as a unit with the central portion of said spring;
and displacement of said core in the direction of its lower surface being limited by said protrusion of said spring;
wherein attractive force causes said core to strike said yoke when current is conducted to said coil, and resilience of said spring causes said core to strike said protrusion of said spring when current is cut off;
thereby producing sound.

5 more elements

Dependencies are inferred from the claim text.

Electromagnetic sound generator

Life of this patent

Electromagnetic sound generator

Life of this patent

Abstract

Claims17