JPS622634Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pickup for a stringed instrument, and more particularly to a pickup for a stringed instrument that utilizes bending vibration of a piezoelectric element.

It is known that musical sounds from stringed instruments such as guitars and pianos are extracted as electrical signals, amplified, and then output as musical sounds from speakers. There are two known methods: (2) converting the strings directly into electrical signals, and (2) obtaining electrical signals using the vibrations transmitted from the strings to the instrument body. The present invention relates to an electric signal extraction means, that is, a pickup using the latter method.

FIG. 1 shows a schematic configuration of a conventional pickup of this type. 1 is a musical instrument main body; 2 is a bent piezoelectric element fixed to the main body 1 via supports 3 and 4; and 5 is a weight fixed to an appropriate position of the piezoelectric element 2.

When the musical instrument body 1 vibrates in response to the vibrations of the strings (not shown), the vibrations are transmitted to the piezoelectric element 2.
At this time, the weight 5 is unable to follow the vibration due to its inertia and tends to remain at a substantially fixed position. For this reason, the piezoelectric element 2 bends and vibrates, and an electric signal corresponding to the vibration is extracted via a lead wire (not shown).

The mechanical resonance frequency of the piezoelectric element depends on the shape and dimensions of the piezoelectric element 2 itself and the mass of the weight 5. If the mass of the weight 5 is reduced, the resonance frequency becomes higher, but the strain rate of the piezoelectric element 2 becomes smaller, so the electrical output becomes smaller. On the contrary, weight 5
Increasing the mass of the piezoelectric element 2 increases the strain rate and increases the electrical output, but not only does the strain force applied to the piezoelectric element 2 increase, increasing the risk of damage to the piezoelectric element, but also increases the mechanical resonance frequency of the piezoelectric element 2. decreases.

When the mechanical resonance frequency is lowered in this way, the fundamental wave of string vibration is reproduced more strongly, making it easier to raise the housing, or the contact sound generated when the player's body touches the instrument. The drawback was that even undesired vibrations were reproduced to a large extent. Furthermore, when the resonant frequency becomes low, the overtones of the string vibrations cannot be sufficiently reproduced, and undesirable timbres appear in the timbre of the reproduced musical sound.

The present invention increases the mechanical resonance frequency of a piezoelectric element, etc., without having the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to FIG. In the figure, the same reference numerals as those in FIG. Pressure screw screwed into one leg, 8
is a stopper disposed at the front end of the pressurizing screw 7;
9 is a rock nut. The piezoelectric element 2 is held between the stopper 8 and the inner wall of the other leg of the U-shaped frame 6 with a predetermined pressure.

In this case, it is desirable that the piezoelectric element 2 and the inner wall of the leg of the U-shaped frame be fixed with adhesive. Also,
Although not shown, since electrical signals are extracted from both ends of the piezoelectric element 2, electrodes and lead wires are required for this purpose. As is clear, if the U-shaped frame 6 is made of a conductive material, it can also be used as one of the electrodes. Note that the dimensions of the piezoelectric element used by the present inventor were 5 mφ x 10 mm.

As described above, according to the present invention, since the piezoelectric element 2 is clamped by the U-shaped frame 6 and the pressurizing screw 7, the mechanical resonance frequency of the piezoelectric element thread becomes high, and the overtones of the string vibration are increased. be able to reproduce it adequately. Moreover, since the compressive force applied to the piezoelectric element 2, and therefore the mechanical resonance frequency, can be adjusted arbitrarily using the screw 7, the timbre of the musical sound output from the speaker can be easily changed according to the player's preference. becomes possible.

Furthermore, in the present invention, as shown in FIG.
When the position of the piezoelectric element 2 changes, not only does the mechanical resonance frequency of the piezoelectric element 2 change, but also its vibration phase changes, allowing the timbre of the musical tone output from the speaker to be subtly changed according to one's preference. That is, if the weight 5 is moved to the left in the figure,
The higher the mechanical resonance frequency, the better the reproduction efficiency of overtones. Conversely, moving it to the right lowers the mechanical resonance frequency, emphasizing the bass and producing a so-called round sound. As shown by the dotted lines in FIG. 4, the legs of the support frame 6 are made of an elastic body bent inward, and the piezoelectric element 2 and the pad 8 are fitted between the legs, thereby compressing the piezoelectric element 2. You may apply force. Although not shown, it is natural to attach screws and weights at this time.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional pickup for stringed instruments, Fig. 2 is a side view of one embodiment of the present invention, and Figs. 3 and 4 are partial sectional views of essential parts of other embodiments of the present invention. It is. 1... Musical instrument body, 2... Bent piezoelectric element, 5...
...Weight, 6... Support frame, 7... Pressurization screw, 8
...A bet.

Claims (1)

[Claims for Utility Model Registration] (1) A support frame having two legs and having a generally U-shaped overall shape; a pressurizing screw screwed into one leg of the U-shaped frame; sandwiched between the inner wall of the other leg of the U-shaped frame and the front end of the pressurizing screw;
1. A pick-up for a stringed instrument, comprising: a piezoelectric element in the form of an elongated rod to which a predetermined compressive force is applied, and the U-shaped support frame is configured to be fixed to the main body of the stringed instrument. (2) The pick-up for a stringed instrument according to claim 1, further comprising a weight attached to the pressurizing screw so as to be movable back and forth.