JPS6146558Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an electric stringed instrument that uses the string pillow itself that supports the strings as a pick-up device.
More specifically, the present invention relates to an improvement in a pickup device so as to prevent the "+" and "-" electrode plates connected to the piezoelectric element from being shot.

Generally, in electric stringed instruments such as electric guitars, multiple pick-up devices are arranged in parallel for each string, and the vibrations of each string are picked up independently by these pick-up devices and converted into electrical signals. . FIG. 1 shows a conventional pick-up device of this type. This pick-up device 1 includes a plurality of piezoelectric elements 2 arranged in parallel in the direction in which the strings are arranged, and the bonding surface 2 of each electrode plate of these piezoelectric elements 2.
It consists of elongated plate-shaped "+" and "-" electrode plates 5 and 6 which are commonly joined to electrodes a and 2b via solders 3 and 4, respectively. in this case,
In the manufacturing process of the pick-up device 1, solder 4 formed in a plate shape is placed on the entire surface of one side of the electrode plate 6, which is normally marked with a "-", and a predetermined number of piezoelectric By placing the elements 2... and heating and melting the solder 4, the electrode plate joining surface 2b of each piezoelectric element 2 and the "-" electrode plate 6 are sequentially joined, and then the "+" electrode plate 5 is connected. Each piezoelectric element 2
are commonly placed on the electrode plate bonding surface 2a of the electrode plates, and sequentially bonded with solder 3.

However, in such a conventional manufacturing method, when the solder 4 is heated and melted, the solder that melts between the piezoelectric element 2 and the "-" electrode plate 6 is eluted between the adjacent piezoelectric elements 2, 2. When the part cools and solidifies, a swelling phenomenon occurs as shown in the figure. In this case, if the plate thickness of the piezoelectric element 2 is sufficiently large, there will be no problem, but if the plate thickness is thin, the raised portion 7 may come into contact with the back surface of the "+" electrode plate 5 and shoot. As a result, the defect rate is high, and the manufacturing process requires great care and skill, which are disadvantageous.

This idea was made in view of the above circumstances,
By bending at least one of the "+" and "-" electrodes so that the area other than the joint with the piezoelectric element is separated from the piezoelectric element, the gap between both electrodes can be set large and soldering can be carried out. To provide a pick-up device for an electric stringed instrument, which is designed to prevent short shots caused by winding and to improve productivity.

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a longitudinal cross-sectional view showing an embodiment of the pickup device according to the invention, and FIGS. 3 a and 3 b are a cross-sectional view and a plan view of the main components of the device. Components that are the same as those shown in FIG. 1 are designated by the same reference numerals. In these figures, a lower bridge 11 is located on the surface of the soundboard (top board) 10 that forms the resonator body of the electric guitar.
is fixed with adhesive, and a pickup device 1 constituting a string pillow is housed in a recess 12 formed on the upper surface of the lower bridge 11 via a case 13.

In the pickup device 1, the "+" and "-" electrode plates 5 and 6 are connected to the bonding surface 2 of the electrode plates, as in the conventional case.
A plurality of piezoelectric elements 2 bonded to a and 2b via solders 3 and 4, and a string support member made of epoxy resin or the like and commonly supporting all the strings, for example, six strings 14 on its top surface. 15 are integrally molded. In this case, "+"
As shown in the figure, the electrode plate 5 is bent in a substantially inverted V-shape at the portion that is in contact with the substantially center of each piezoelectric element 2 so as to protrude toward the back side, so that this bent portion forms a joint A to each piezoelectric element 2. These bonding portions A are bonded to each piezoelectric element 2 via solder 3. In other words, the "-" electrode plate 5
The distance G between the "+" and "-" electrode plates 5 and 6 is reduced by bending the electrode plate 5 into a substantially square shape so that the parts other than the joints A are separated from the piezoelectric element 2.
is set large. One ends of lead wires 16, 17 for signal extraction are connected to one ends of the "+" and "-" electrode plates 5, 6 by soldering, etc., and the other ends of these lead wires 16, 17 are After passing through the case 13, the lower bridge 11, and the soundboard 10 and being guided into the resonator body, it is led outside and connected to an electric circuit. Incidentally, the case 13 is made of a conductive metal and is kept at the same potential as the "-" electrode plate 6.

Therefore, in an electric guitar equipped with such a pickup device 1, when a certain string 14 is plucked to vibrate, the vibration of the string 14 is transmitted to the string receiving member 15.
is transmitted to the corresponding piezoelectric element 2 via. As a result, an electrical signal corresponding to the string vibration is generated between the "+" and "-" electrode plates 5 and 6, and this electrical signal is led to the signal processing circuit via the lead wires 16 and 17. After the signal is processed in a circuit, it is amplified and emitted as an electric sound from a speaker.

Since the pickup device according to this invention is constructed as described above, contact and bonding between the solder 4 and the "+" electrode plate 5 can be reliably prevented. That is, by bending the "+" electrode plate 5 into a substantially square shape and separating the portions other than the joints A from the piezoelectric element 2, the distance G between the two electrode plates 5 and 6 can be set large. Therefore, even if a raised part 7 is formed between the adjacent piezoelectric elements 2 when the solder 4 solidifies, it will not come into contact with or join the "+" electrode plate 5, and therefore the short can be prevented and the occurrence of defective rate can be reduced. Moreover, if such contact is small, anyone can easily perform soldering work without requiring any skill, and it is possible to improve productivity and reduce manufacturing costs.

In the above embodiment, only the "+" electrode plate 5 is bent to form the joint A with the piezoelectric element 2, but this invention is not limited to this, and the "-" electrode plate 6 is bent. It is obvious that if similar joints are provided within the allowable range, the distance between the electrode plates 5 and 6 can be set even larger, and contact between them can be prevented.

As explained above, according to the pick-up device for an electric stringed instrument according to this invention, at least one of the "+" and "-" electrodes bonded to each electrode bonding surface of the piezoelectric element is formed into a substantially square shape. Since all the other parts except the joint with the piezoelectric element are separated from the piezoelectric element, it is possible to set a large gap between the two electrodes, and it is possible to prevent shorts caused by solder build-up between the two electrodes during the soldering process during manufacturing. This can be reliably prevented, the soldering work is easy and requires no skill, and productivity and quality can be improved, which is very effective.

[Brief explanation of drawings]

1A and 1B are a sectional view and a plan view of essential parts of an example of a conventional pickup device, FIG. 2 is a sectional view of an embodiment of a pickup device according to this invention, and FIGS. 3A and 3B are the same. FIG. 2 is a cross-sectional view and a plan view of the main components of the device; FIG. 1...Pickup device, 2...Piezoelectric element, 2
a, 2b... Electrode bonding surface, 3, 4... Solder, 5...
..."+" electrode, 6... "-" electrode, 14...
String, A... joint.

Claims (1)

[Scope of utility model registration request] Each electrode joint surface of a plurality of piezoelectric elements arranged in parallel in the direction in which the strings are arranged in parallel, and "+" and "-" electrodes each having a length that extends in common to all piezoelectric elements. When bonding each, at least one of the "+" and "-" electrodes and the bonding portion with the electrode bonding surface are made to protrude toward the piezoelectric element to form a bonding portion, and the other portions are separated from the piezoelectric element. A pick-up device for an electric stringed instrument characterized by: