JPS62184386A - Screen image display type electronic metronome - Google Patents

Abstract

PURPOSE:To obtain tact effect with good visibility by receiving luminous flux in a tact rod shape by a mirror which is amplitude-rotated with an electromagnetic force according to electrically generated tempo data, and projecting reflected light which moves reciprocally to right and left and forming an image. CONSTITUTION:By causing a current to flow through a coil 4 as shown in a figure, the coil 4 and a magnet 7 repulse each other according to the Fleming's left-hand rule and a coil frame 5 rotates around a torsion bar 6 as an axis of rotation as shown by an arrow. If the current is ceased, the coil frame 5 returns to its neutral stable position with the restitutive force of the torsion bar 6. Then, at the time of a current having the opposite polarity from said current is applied to the coil, the coil frame 5 rotates in the opposite direction from the arrow according to the coil 4 and when the current is ceased, the frame returns to its original neutral stable position. Thus, an alternating pulse current synchronized with a tempo is applied to the coil 4, a mirror 3 enter amplitude rotation in synchronism with the tempo. For the purpose, the tempo is adjusted by adjusting the period of the alternating pulses applied to the coil.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronic metronome that projects an image that moves back and forth on a screen in accordance with tempo data, thereby providing a diagonal display.

(Summary of the Invention) The present invention receives light having a predetermined spot shape with a mirror that rotates in amplitude according to tempo data, and projects the reflected light that moves back and forth from side to side on a screen as an image, thereby displaying the tempo. It is an electronic metronome. Amplitude rotation control of the mirror is performed electrically. This provides a tempo display that looks as if the tact bar is vibrating from side to side without actually using the tact bar, which is highly effective for visual recognition.

(Prior Art) Conventionally used metronomes include, for example, mechanical metronomes in which a tact bar is vibrated left and right. However, since the mechanical metome uses a mainspring as its driving force, the mainspring had to be wound frequently, which was inconvenient. There was also the inconvenience that the tempo varied depending on the amount of winding of the mainspring.

- Square crystal Some electronic metronomes in use display the tempo with flashing lights or intermittent sounds. ) was inferior compared to

Furthermore, recently, an electronic metronome has been developed that uses an electric meter to display the tempo in order to produce a tact effect.

(Problems to be Solved by the Invention) The electronic metronome using an electric meter mentioned last in the prior art has a tact effect, and since it is electronic, there is no need to wind the mainspring. However, it had the following problems.

In other words, the electric meter has poor tracking ability and cannot respond when the tempo becomes fast. Furthermore, it is difficult to use a large meter needle like a tact rod due to the driving force, and only small meter needles can be used in practice, making it impossible to obtain a tact effect with good visibility.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems. For this purpose, I obtained the following purchasing means.

In other words, in the present invention, a light beam having a predetermined spot shape (for example, a tact rod shape) is received by a mirror that rotates in amplitude by electromagnetic force according to electrically generated tempo data, and the reflected light beam moves back and forth from side to side. An electronic metronome was constructed in which light is projected onto a screen to create an image, and this image is used to display Lambo.

(Function) As a result, a tact effect can be obtained, as if the image of the tact rod or the like is moving left and right in synchronization with the tempo, without actually using the tact rod or the electricity meter button.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a basic configuration diagram of a screen image display type electronic metronome. Reference numeral 1 denotes a fixed light source, which emits a light beam 2 that forms a predetermined spot shape (for example, a tact rod shape, an animal shape, etc.). The light beam 2 may be natural white light or may be colored light. 3 is a mirror that reflects the incident light beam 2; A coil 4 is placed on the same plane as the mirror 3.

5 is a coil frame on which the mirror 3 and the coil 4 are placed. A torsion bar 6 supports the coil frame 5 from above and below. 7 (It is a horseshoe-shaped magnet and the coil frame 5 is [1
1. Reference numeral 8 denotes an electric circuit section which applies an alternating current pulse whose polarity changes according to a desired tempo setting input value to the coil 4. 9 is a screen made of ground glass or the like. A spot of the reflected light beam 10 reflected by the mirror 3 is photographed and displayed as an image 11.

FIG. 2 is an explanatory diagram of the operation of the screen image display type electronic meter [1 Norm]. Figure (A) is a front view of the vicinity of the driving means, and Figure (B) is a plan view. In Figure (A), the torsion bar 6 supports the coil frame 5 from below along an axis that substantially coincides with the rotation axis of the coil 4. The torsion bar 6 is in a neutral stable position in the state shown in FIG.

In Figure (B), the coil 4 is placed between the poles of the horseshoe magnet 7. Now, if we do not apply current to the coil 4 in the direction shown in Figure (B), according to Fleming's left hand rule, the coil 4
and the magnet 7 repel each other, and the coil frame 5 is connected to the torsion bar 6.
Rotate in the direction of the arrow using as the rotation axis. When the current is turned off,
The coil frame 5 returns to the neutral stable position due to the restoring force of the torsion bar 6. When a current with the opposite polarity to the previous current is applied to the coil, the coil frame 5 rotates in the direction of the arrow opposite to the previous one according to the coil 4, and when the current is cut off, it returns to its original neutral stable position. If an alternating pulse current synchronized with the tempo is applied to the coil 4 in this manner, the mirror 3 will rotate with amplitude in synchronization with the tempo. Therefore, the tempo is adjusted by adjusting the cycle of alternating pulses applied to the 11th pulse. Further, the amplitude value is determined by the peak value of the AC pulse.

FIG. 3 is a schematic front view of the screen image display type electronic metronome. On the screen 9 made of frosted glass,
A spot image 11 of a reflected light beam 10 moving back and forth left and right according to the amplitude rotation of the mirror 3 is shown. This image 11
swings just like a tact rod, producing a tact effect. Reference numeral 12 denotes a tempo setting dial, through which a desired tempo value is manually input. The tempo can be set and input from 40 beats per minute to 208 beats per minute. 13 is a speaker which transmits the beat by sound. The reciprocating motion of the shadow 8111 and the sound from the speaker 13 are synchronized.

FIG. 4 is a block diagram of the electric circuit section 8.

Reference numeral 14 denotes a reference signal generation circuit, which is composed of, for example, a crystal oscillation circuit. Reference numeral 15 is a variable frequency dividing circuit which divides the frequency of the reference signal. A tempo value input circuit 16 includes a tempo setting dial, and controls the frequency division ratio of the variable frequency divider circuit 15 so that a pulse signal having the same period as the tempo value is obtained.

17 is a coil signal generating circuit which inputs the pulse output of the variable frequency dividing circuit 15 and synthesizes an alternating pulse in synchronization with the pulse output. , 18 is a drive circuit which amplifies the alternating pulses to a desired value and then applies them to the coil 4. The J3 tempo pulse signal is applied to the speaker 13 via the speaker signal generation circuit 19 and the speaker drive circuit 20.

(Effects of the Invention) According to the present invention, the image projected on the screen allows
It is possible to display a tempo with a visual effect similar to that of a tact bar. Therefore, it can provide the same tact effect with good visibility as a mechanical metronome. Also, unlike the system that uses an electric meter needle as a tact bar, an optical system is used, so it can adequately follow high-speed tempos.

Furthermore, even if the image is made sufficiently large, it has the effect of requiring less power consumption, unlike driving an electric meter needle.

[Brief explanation of drawings]

Figure 1 is a basic configuration diagram of the screen image display type electronic meter [''Nome], Figures 2 (A) and (B) are operation explanatory diagrams of the screen image display type electronic meter 1-1 No. 11, and Figure 3 is the screen A front overview view of the image display type electronic metronome and FIG. 4 are a block diagram of the electric circuit section. 1... Light source 3... Mirror 4... Coil 5... Coil frame 6... Torsion bar 7... Magnet 8... Electric circuit section 9... Screen 11... Image 12... ... Tempo setting dial 14 ... Reference signal generation circuit 15 ... Variable frequency division circuit 16 ... Tempo value input circuit 17 ... Coil signal 8 generation circuit 18 ... Drive circuit Applicant Seiko Denryo 1 Industry Co., Ltd.'s 7 Thorn shadow 1t & hop a Baby metronome basic o/ko diagram Figure 1 Zufreen shadow I elephant moxibustion ho 2 Electronic metronome Otsu's front tip U perspective diagram Figure 3

Claims (5)

[Claims] (1) a light source that emits light having a predetermined spot shape;
A screen image display consisting of a mirror surface that receives and reflects the light, a drive means that rotates the mirror surface in amplitude according to arbitrarily set and input tempo data, and a screen that receives the reflected light spot that moves back and forth and displays an image. Electronic metronome. (2) The screen image display type electronic metronome according to claim 1, wherein the spot shape of the light emitted from the light source is a tact type. (3) The screen image display type electronic metronome according to claim 1, wherein the spot shape of the light emitted from the light source is in the shape of an animal. (4) The screen image display type electronic metronome according to claim 1, wherein the light emitted from the light source is colored light. (5) The driving means includes a torsion bar that supports the mirror surface along the rotation axis of the mirror surface, a coil placed on the back side of the mirror surface, a circuit that applies an alternating current synchronized with tempo data to the coil, and A screen image display type electronic metronome according to claim 1, which comprises a permanent magnet that exerts a magnetic force on a coil.