Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1988-12-21
1990-05-15
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335297, 336 83, 336196, H01F 300
Patent
active
049261517
ABSTRACT:
A coil (33, 33a) is wound on a bobbin (22, 22a), one flange (24, 24a) of which has an end surface provided with a central projection (26, 26a) on its center and first and second end projections (27, 27a; 28, 28a) on its opposite end portions respectively, thereby to define first and second cavities (29, 29a; 30, 30a). First and second electrodes (31, 31a; 32, 32a) are provided to extend from the first and second end portions of the flange toward its side surface. First and second terminals (34, 34a; 35, 35a) of the coil are respectively received in the first and second cavities, which in turn are filled with solder members (36, 36a; 37, 37a) to electrically connect the first and second terminals to the first and second electrodes respectively. The first and second end projections are adapted to reduce the volume of solder required for mounting the chip-type coil element as well as to substantially prevent the coil element from inclination, thereby to prevent a tombstoning phenomenon.
REFERENCES:
patent: 1517770 (1924-11-01), Ziegler
patent: 3824518 (1974-07-01), Slenker
patent: 4245207 (1981-01-01), Murakami et al.
patent: 4314221 (1982-02-01), Satou et al.
patent: 4696100 (1987-09-01), Yamamoto et al.
patent: 4769900 (1988-09-01), Morinaga et al.
patent: 4801912 (1989-01-01), McElheny et al.
Harris George
Murata Manufacturing Co. Ltd.
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