Music – Instruments – Electrical musical tone generation
Reexamination Certificate
1998-01-28
2001-09-18
Witkowski, Stanley J. (Department: 2837)
Music
Instruments
Electrical musical tone generation
C084S728000, C336S110000, C336S220000, C336S221000
Reexamination Certificate
active
06291758
ABSTRACT:
BACKGROUND OF THE INVENTION
It is well known that a pickup consisting of a single monolithic coil will pick up stray electromagnetic radiation and transmit this radiation (when coupled to a musical instrument amplifier) in the form of noise, which is audible as low frequency 60 HZ hum. There is also electrostatic noise, in the form of high frequency buzzing, at the pickup's resonant peak frequency. By combining a pair of coils as employed in the humbucking pickup principle, the audible noise factor is considerably reduced but not completely eliminated. As shown in U.S. Pat. No. 4,442,749, the humbucking principle can be applied in a pickup with the coils arranged in a concentric configuration, with a metal plate formed into a U shaped channel common only to the upper coil section of the pickup. This configuration is inductively unbalanced, which compromises the noise reduction capability of the pickup.
SUMMARY OF THE INVENTION
The present invention in one of its aspects has symmetrically balanced coils arranged in a concentric configuration, with a ferromagnetic steel plate centrally common to both coils; it incorporates the humbucking pickup principle for maximum noise immunity.
There is an improved means for increasing the volume of magnetic flux through the coils of the pickup, which correspondingly increases the output voltage and signal amplitude of the pickup.
There is an improved means for adding or subtracting inductive components to enhance the sound and tonal characteristics of the pickup, without compromising noise immunity.
There is an improved means for incorporating magnetic pole pieces of varying length in the pickup to control the output, balance, and sensitivity for varying diameter musical strings.
There is an improved means for increasing isolation between the pickup coils to reduce phase cancellation of common frequencies, which allows the pickup to exhibit an improved harmonic content for richer sound and tonal quality.
REFERENCES:
patent: 3916751 (1975-11-01), Stich
patent: 4283982 (1981-08-01), Armstrong
patent: 4442749 (1984-04-01), Di Marzio et al.
patent: 4524667 (1985-06-01), Duncan
patent: 5168117 (1992-12-01), Anderson
patent: 5834999 (1998-11-01), Kinman
Fender Musical Instruments Corporation
Stradling Yocca Carlson & Rauth
Witkowski Stanley J.
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