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 Title: |
US5109747:
Piezoelectric bridge sound pick-up for string instruments
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Spuler, Rolf; 8405 Winterthur, Switzerland
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| Assignee: |
None
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| Published / Filed: |
1992-05-05
/ 1990-09-25
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| Application Number: |
US1990000587732
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| IPC Code: |
Advanced:
G10H 3/18;
Core:
G10H 3/00;
IPC-7:
G01H 3/18;
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| U.S. Class: |
Current:
084/731;
084/DIG.024;
Original:
084/731;
084/DIG.24;
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| Field of Search: |
084/731,DIG. 24
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| Priority Number: |
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| Abstract: |
A piezoelectric bridge sound pick-up string instruments has a separate subassembly for each string. Each subassembly has a metal base body (4) with a pocket (4.1) for a piezoelectric sensor element (7), a sensor holder (5) and a pressure piece (8). The pocket is at right angles to the string and is tilted in accordance with the string pressure direction. The sensor element is embedded in an electrically insulating holder, which has a break in its central area (6) and allows a certain deflection of the sensor element. To an electrode on the under surface of the sensor element is fitted a conductor (9) for passing out a signal with positive potential. On an opposite, upper electrode surface is provided a pressure piece with a semi-circular cross-section, which transfers by friction the alternating pressure of the string (14) and functions as an electrical connection of ground potential.
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| Attorney, Agent or Firm: |
Farley, Walter C. ;
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| Primary / Asst. Examiners: |
Witkowski, Stanley J.;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 12 claims |
I claim:
1. A piezoelectric bridge sound pickup for a single strip of a string instrument comprising the combination of
- a metal base body supported on a surface of the instrument, said base body having a bottom wall of at least 2 mm thickness, said bottom wall having an upper support surface;
- an electrically insulating holder supported by said support surface;
- a piezoelectric element supported on said holder and insulated from said base body by said holder;
- a pressure piece resting on said piezoelectric element between said piexoelectric element and said string so that said string passes over and contacts said pressure piece and exerts alternating forces along a line through said pressure piece as said string vibrates; and
- means between said pressure piece and said base body for elastically holding said pressure piece in position and for partially damping vibrations caused by said string,
- said upper support surface of said bottom wall being inclined relative to the surface of the instrument so as to lie in a plane substantially perpendicular to said line along which said string vibrates.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 13 U.S. patent(s) that reference this one
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