Star Micronics Company Limited

Shigeru Sugiyama

Hajime Kitamura

Yoshio Imahori

Naohiro Fujinami

Hitoshi Yamashima

Tomoyuki Sato

Fuminori Moritake

Hisashi Kubota

Katsuyoshi Ohmori

Hidekazu Urano

Masami Kushida

Speaker for vehicle

Pump

A low cost dynamic speaker ( ) prevents damage of the diaphragm ( ) when the speaker ( ) is mounted on a printed circuit board ( ). An insulating ring ( ) is attached to the front surface of the diaphragm ( ) at the periphery. The insulating ring ( ) has a pair of terminal pins ( ) supported thereon for continuity of the lead wire ( ) with the conductor ( ) of the printed circuit board ( ). The conducting portion (24 ) of each of the terminal pins ( ) is protruded forward beyond the annular flat surface ( ) of the insulating ring ( ).

Speaker

The diaphragm is supported by the frame at the outer edge thereof. The pair of terminal members is mounted on the frame, and a pair of lead wire drawn from the voice coil is fixed to the land portion of the terminal member for electrical continuity. Since the land portion is disposed on the upper side of the frame, fixation of the lead wire can be performed without turning the frame upside down. This simplifies the manufacturing process of the speaker and also prevents a breakage of the lead wire that conventionally happens when the frame is turned upside down. Further, this prevents the operator from touching the lead wire since no part of the lead wire is exposed outside the frame after the fixation.

A speaker holder includes a speaker engagement portion ( ) abutting the bottomed cylindrical portion ( A) of the frame ( ) of the speaker ( ) and a plurality of engagement legs ( ) extending from the speaker engagement portion ( ). The speaker (10) is disposed tightly between the speaker engagement portion ( ) and the printed circuit board ( ) and fixed thereto via the engagement legs ( ).

Speaker holder

Fixing of a voice coil ( ) to a diaphragm ( ) is performed by caulk-fixing a coil supporting member ( ) to the diaphragm ( ) and by fit-supporting the voice coil ( ) by the coil supporting member ( ). Hereby, the voice coil is physically fixed to the diaphragm ( ) and its fixing strength is heightened. The caulk-fixing is performed by subjecting a caulking projection of the coil supporting member ( ) to a plastic deformation thereby to provide a caulk-fixed portion ( ), whereby deformation injurious to the acoustic property does not occur in the diaphragm ( ). Further, the fit-supporting is performed by interposing a flange portion ( ) formed at an upper end portion ( ) of the voice coil ( ) between an engaging portion ( ) of the coil supporting member ( ) and a central flat portion ( ) of the diaphragm ( ) and holding it by them from upper and lower sides.

A frame ( ) supporting a diaphragm ( ) by its outer periphery is constructed by a connecting ring ( ) and a base ( ) which comprises a bottomed cylinder portion ( A) and a mounting portion ( B) which extends radially outward from the bottomed cylinder portion ( A) which is a part of the magnetic circuit unit ( ). The connection is achieved by the caulking of the ring ( ) and the mounting portion ( B) with the diaphragm ( ) clamped therebetween.

By forming a flange portion ( ) protruding inward in the radial direction at an upper end portion ( ) of a voice coil ( ), a coiling sectional shape of the voice coil ( ) is set to a L-shape. And, the upper end portion ( ) of this voice coil ( ), is bonded and fixed to a central flat portion ( ) of a diaphragm ( ). Hereby, by only increasing slightly the weight of the usual voice coil having an I-shaped coiling section, the large bonding area can be obtained between the voice coil ( ) and the diaphragm ( ), so that separation of the voice coil ( ) can be prevented. Further, since other portions of the voice coil ( ) than the upper end portion ( ) thereof have the usual coil thickness, it is not necessary to expand the width of a cylindrical magnetic gap G in a magnetic circuit unit ( ), whereby it is prevented that electroacoustic conversion efficiency of a speaker ( ) lowers.

Growing community of inventors

Shizuoka, Japan

Shigeru Sugiyama