JPS6230077Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a piezoelectric pickup that converts guitar string vibrations into electrical signals, and the purpose is to make the pickup mounting part special or designed, or to make the structure larger or more complex. The present invention provides an inexpensive piezoelectric pickup that can be easily attached to a guitar of general structure and has excellent durability.The drawings will be explained below.

In FIG. 1, reference numeral 1 denotes a pickup base body having a thin rod 1a made of polyurethane rubber or the like and a flat base 1b attached to one end of the rod 1a, either integrally with the rod or separately. The outer dimensions of the thin rod 1a are as follows:
It is adapted to be inserted together with the bridge into the groove formed in the bridge support member of the guitar shown in the figure, and the area of the base 1b is adapted to accommodate a connector for a signal transmission cord, which will be described later. 2 is a flexible cable-type piezoelectric element that is embedded over almost its entire length inside the thin rod 1a of the base and forms a mechanical-electrical conversion section P together with the thin rod 1a, with one end extending from an arbitrary point on the top surface of the base 1b. As shown in detail in Figure 2, this flexible cable-type piezoelectric element 2 has a core 2a of metal twisted wire or the like, and on its outer periphery, a piezoelectric layer 2b made of a composite piezoelectric material of piezoelectric ceramic powder and rubber or resin, a metal winding tape,
After a conductive layer 2c of carbon paste or the like is successively formed to cover the core 2a, an electric field is applied between the core 2a and the conductive layer 2c to polarize the piezoelectric layer 2b uniformly over its entire length. A cable-type piezoelectric element of this construction is preferable for the purposes of this invention. That is, even if the cross-sectional dimension of the thin rod 2a of the base is 2 mm square, it can be easily made with an outer diameter of 1.4 mmφ, which is small enough to be embedded inside the thin rod, and it has high enough strength against external stresses such as impact, tension, and bending, and can be obtained inexpensively by continuous extrusion molding. 3 is placed on the base stand 1b, and the cable-type piezoelectric element 2
The core material 2a and conductive layer 2c at one end of the piezoelectric element 2 are electrically connected to terminals 3a, 3b via an impedance conversion element 4, and a signal carrying cord 5 is connected to the signal carrying cord 5 for supplying the electrical signal generated in the cable-type piezoelectric element 2 to an amplifier speaker system (not shown). The impedance conversion element 4 is intended to remove noise signals and reliably extract only the signal due to string vibration, but is not necessarily required.

In addition, if the piezoelectric pickup is a cordless type, install a connector on the base 1b instead of the above connector.
A small transmitter such as an FM transmitter may be installed, and one end of the cable-type piezoelectric element may be electrically connected to the transmitter with or without an impedance conversion element.

Next, FIG. 3 shows an example of application of the piezoelectric pickup according to the present invention shown in FIG. A string bridge 13 inserted in the groove 11a so that the top protrudes
is bridged between a plurality of string stops 14 arranged in parallel close to the bridge support member and a string tension adjuster (not shown) attached to the tip of the guitar neck, and is in elastic contact with the top of the bridge 12. The piezoelectric pickup PU of the present invention has a plurality of stretched strings, which are included in guitars with a general structure. It is inserted and attached together with the bridge 12 directly below.

According to the embodiment of the present invention, the mechanical vibrations generated by pulling the string 13 are transmitted through the bridge 12.
It is converted into an electrical signal by the mechano-electric converter P of the piezoelectric pickup. This electrical signal is applied directly to the amplifier speaker system through the signal carrier cord 5, or is radiated into the air as a radio wave by a transmitter and input to an amplifier speaker system equipped with a receiver to acoustically drive the speaker.

The piezoelectric pick-up of the present invention has the above-mentioned structure, and the mechanical-electric conversion part of the pick-up has an external shape that allows it to be inserted into the groove of the bridge support member together with the bridge. It can be directly attached to a guitar with a general structure without having to design or make the structure of the part large or complicated. Furthermore, the present invention uses a flexible cable-type piezoelectric element that has high mechanical strength and is easy to manufacture. Therefore, piezoelectric pickups with excellent durability can be offered on the market at low cost.

[Brief explanation of the drawing]

FIG. 1 shows a piezoelectric pickup according to the present invention.
A is a plan view, B is a front cross-sectional view taken along line A-A, and C is a front cross-sectional view taken along line A-A.
FIG. 2 is a cutaway perspective view of the main part of the cable-type piezoelectric element used in the present invention, and FIG. 3 shows the piezoelectric pickup of the present invention attached to a guitar bridge support member, with A being a perspective view of the main part, and B being a sectional view taken along line H-H in FIG. 1: Base, 1a: Thin rod, 1b: Base, 2:
... cable-type piezoelectric element, 3... connector for signal transmission cord, 11... bridge support member, 11a...
The grooves are 12...string bridge.

Claims (1)

[Scope of utility model registration request] A thin rod made of a flexible material adapted to be inserted into the groove of the bridge support member together with the bridge, and a signal carrying cord connector or a small cordless transmitter, etc. can be installed at one end of the rod. A flexible cable-type piezoelectric element is embedded in a thin rod of the base body over almost its entire length to constitute a mechanical-electric transducer, and one end of the piezoelectric element A piezoelectric pickup for a guitar, characterized in that the pickup is led out from a base and electrically connected to a connector or transmitter on the base.