Wave transmission lines and networks – Coupling networks – Delay lines including a lumped parameter
Patent
1982-01-27
1984-06-05
Gensler, Paul L.
Wave transmission lines and networks
Coupling networks
Delay lines including a lumped parameter
333185, H03H 100
Patent
active
044531443
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an LC composite component such as an LC filter, delay line or the like each provided with coil and a capacitor.
BACKGROUND OF THE INVENTION
Conventionally in an LC composite component such as a delay line, an LC filter or the like, a coil is wound around a coaxial bobbin. The lead wire of the capacitor is wound around a terminal pin erected on the collar of the coaxial bobbin and the portion is connected through soldering.
In LC composite components of such construction as described hereinabove, the connection of the capacitor is unreliable, since the fixing of the capacitor to the other elements depends upon the connecting strength of the lead wire upon the terminal pin. Also, the lead wire of the capacitor is wound and soldered around the terminal pin to connect and secure the capacitor. Incorporating the capacitor into such a component takes considerable labor and thus the productivity of such components is poor.
SUMMARY OF THE INVENTION
Thus, the present invention provides an LC composite component, including a coaxial bobbin, a plurality of collars thereon defining winding grooves therebetween, coils wound in the winding grooves, each collar having a concave recess therein open at a top end thereof, terminal pins projecting upwardly from the opposite ends of the concave recess, a leadless tip type capacitor having upwardly projecting electrodes accomodated in the concave recess and the coils and the capacitor electrodes being connected with each other by the terminal pins, the capacitor or electrodes being connected to the terminal pins at the open end of the concave recess of each collar to allow the capacitor to be secured with stable, firm strength and the capacitor to be easily built-in.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partially broken-away perspective view of an LC composite component in one embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the essential portion thereof. FIG. 3 is an enlarged cross-sectional view of the essential portion in the other embodiment. FIG. 4 is a top plan view of the essential portion thereof. FIG. 5 and FIG. 6 are enlarged top plan views showing the essential portion thereof in still other embodiments.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the description of the embodiment shown in FIG. 1 and FIG. 2, reference numeral 1 is a synthetic-resin coaxial bobbin, which has a plurality of collars 2 disposed at equal intervals and has a plurality of winding grooves 3 formed between the collars 2, coils 4 being wound in the winding grooves 3. Also, a concave recess 5 is provided in the top face of the collar 2. Terminal pins 6 are planted so as to upwardly project, respectively, from both ends of the concave recess 5. A leadless tip type of square-shaped capacitor 7 such as a ceramic capacitor with upwardly projecting electrodes 7a at its both ends is accommodated in the concave recess 5 with the terminal pins 6 being planted therein. The capacitor 7 is secured through electric and mechanical connection of the electrodes 7a to the terminal pins 6 by means of soldering or the like at the open end of concave recess 5. A case 8 made of metal or the like is put on the coil 4, the coaxial bobbin 1 with the capacitor 7 being built therein. Engagement projections 9, which are provided respectively on the inner faces of both sides of the case 8, come into contact with the top faces of the collars 2 located on both ends of the coaxial bobbin 1 to perform their positioning operations to prevent the ceiling face of the case 8 from coming into contact with the terminal pin 6. Inward engagement projections 11 which are provided on the front face and the reverse face of the case 8 project into grooves 10 extending in horizontal directions in the front faces and the reverse faces of collars 2 so as to engage collars 2, thereby to connect the coaxial bobbin 1 with the case 8.
Although not shown, the lead wire of the coil 4 is wound and soldered around the necessary
REFERENCES:
patent: 3750054 (1973-07-01), Tamura et al.
patent: 4074210 (1978-02-01), Otake et al.
patent: 4163202 (1979-07-01), Tunematu et al.
Otake Hiroshi
Otani Yoshiaki
Tamura Toshiaki
Yamamura Masami
Gensler Paul L.
Lee Benny
Matsushita Electric - Industrial Co., Ltd.
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