JPS5825432Y2 - electric instrument effect device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an effect device for electric musical instruments.

Conventional electric musical instruments have a method of rotating a speaker or the like to generate effects such as tremolo, but this method has the disadvantage that the device is complicated.

The present invention is an electric musical instrument that uses a so-called magneto-electric pickup, in which a permanent magnet is installed near strings stretched on a frame, and the electromotive force generated in the strings due to vibration of the strings is amplified and emitted through a speaker. The purpose is to achieve the above effect with a simple configuration, and a permanent magnet 3 is provided near the string 2 stretched on the frame 1 to amplify the electromotive force generated in the string 2 due to the vibration of the string 2. This electric musical instrument emits sound through a speaker, and includes a support 4.11 on which a permanent magnet 5 is disposed, and a motor 6 for moving the support 4.11'.
The present invention is characterized in that a periodically variable magnetic field generating device that provides a periodically changing magnetic field to the strings 2 is provided in the vicinity of the strings 2.

The present invention will be explained below with reference to the drawings.

1 and 2 show an embodiment of the present invention, and 4 is a string 2.
It is a cylindrical support body in which a plurality of permanent magnets 5 are disposed in the axial direction corresponding to the axial direction, and is driven by a motor 6 via a gear box 7 and a gear 8.

Thus, when the motor 6 is not energized, when the string 2 is hit with the hammer 9, the vibrating string 2 cuts the magnetic flux of the permanent magnet 3, so a voltage is generated in the string 2, and this voltage is amplified by the amplifier. The sound is emitted from a speaker, etc.

It is normally used in this state, but when creating a tremolo effect, the motor 6 is energized to rotate the cylinder 4.

The permanent magnet 5 on the cylindrical body 4 moves closer and further away from the string 2. When the magnet 5 approaches the string 2, the voltage induced in the string 2 becomes sharp, and when it moves away, the voltage decreases, and the pitch also changes accordingly. It changes somewhat.

Therefore, the voltage induced in the string 2 by the permanent magnet 3 is amplitude-modulated by the voltage by the permanent magnet 5, and a musical tone with a tremolo effect is emitted from the speaker.

The embodiment shown in Figure 1 is applied to two strings, but the third string
The illustrated embodiment is applied to a single string, and the permanent magnets 5 for each string 2 are arranged on a cylinder 4 with their phases shifted from each other.

FIG. 4 shows another embodiment of the present invention, in which a periodically variable magnetic field generating device including a permanent magnet 5 is driven by a motor 6 to a gear box 7.
, consists of a frame 11 as a support for reciprocating permanent magnets 5 via a cam 10, and a permanent magnet 5 fixed to this frame 11, and the permanent magnet 5 is displaced in the direction in which the strings 2 are arranged and Provides a periodically changing magnetic field.

In the embodiment on the ground, a case has been described in which a tremolo effect is obtained, but by appropriately changing the rotational speed of the motor, the position of the permanent magnet 5, etc., it is also possible to obtain a wah, vibrado effect, etc.

As described above, according to the present invention, various effects such as tremolo can be obtained with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is a top view taken along line 1--2 in FIG. 1, and FIGS. 3 and 4 are top views of different embodiments of the present invention. 3... Permanent magnet, 4... Cylindrical body, 5... Permanent magnet, 6... Motor, 9... Hammer 10... Cam
11...Frame body.

Claims (1)

[Scope of utility model registration request] A permanent magnet 3 is provided near the string 2 stretched on the frame 1,
In an electric musical instrument that amplifies the electromotive force generated in the string 2 due to the vibration of the string 2 and emits sound from a speaker, a permanent magnet 5
A periodically variable magnetic field generating device is provided on the string 2, comprising supports 4, 11 on which are arranged and a motor 6 for moving the supports 4, 11' (r), and providing a periodically changing magnetic field to the string 2. An effect device for an electric musical instrument, characterized in that the device is installed close to each other.