JP3239283B2 - Horn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horn used in automobiles and the like.

[0002]

2. Description of the Related Art As a conventional horn, there is a horn shown in FIGS.
No. 7-190600, JP-A-61-249097). An electromagnetic drive means 3 having a pole 2 in the center is provided in a case 1 of the horn. An armature 4 is provided so as to face the electromagnetic driving means 3, and a diaphragm 5 and a resonator (also called a resonator) 6 are attached to the armature 4. The peripheral edge of the diaphragm 5 is attached to the peripheral flange 1 a of the case 5.

[0003] The case 1 is provided with an interrupter 9 comprising a first contact member 7 and a second contact member 8.
The tip of the second contact member 8 is engaged with the lower side of the armature 4 so that the second contact member 8 can be freely moved toward and away from the first contact member 7. That is, in the normal state, the second contact member 8 is in contact with the first contact member 7 by its own elastic force, but is pushed in the same direction by the movement of the armature 4 in the separation direction B, and As the armature 4 moves away from the contact member 7 and moves in the connection direction A, the first contact member 7 can be contacted again. The first contact member 7 and the second contact member 8 are connected with electric wires 11 and 12 forming a current circuit including the electromagnetic driving means 3 and the power supply 10, respectively. 2 contact members 8
Is connected, a current flows to the electromagnetic driving means 3, and if the two are separated, the current is cut off.

Next, an operation state of the alarm will be described.
When a current flows from the power supply 10 to the electromagnetic driving means 3, the pole 2 is electromagnetized, and the armature 4 is attracted and moves in the separating direction B. Then, the second contact member 8 is separated from the first contact member 7 by being pushed by the armature 4 and the current to the electromagnetic driving means 3 is cut off, so that the electromagnetic driving means 3 loses the magnetic force. When the pole 2 of the electromagnetic driving means 3 is hit by the above, the elastic force of the diaphragm 5 causes the pole 2 to return to its original state. When the second contact member 8 comes into contact with the first contact member 7 again, a current is again supplied to the electromagnetic driving means 3. Flows. By violently repeating such an operation, the diaphragm 5 reciprocally vibrates to generate a sound wave, and the sound wave emitted from the vibration plate 5 is amplified by the resonator 6 so as to be emitted outside as an alarm sound. It has become.

[0005]

However, in such a conventional technique, an intermittent current is applied to the electromagnetic driving means 3 to reciprocate the armature 4 and the diaphragm 5, thereby causing the diaphragm to move. 5 generates a sound wave, but there is a disadvantage in that the timing of the magnetic force applied from the electromagnetic driving means 3 to the armature 4 is disadvantageous in view of the energy efficiency of the armature 4.

That is, considering the vibration of the armature 4 itself, since the armature 4 is connected to the peripheral flange 1a of the case 1 via the diaphragm 5 which is an elastic member, FIG. As shown in (1), the armature 4 vibrates at a constant amplitude S in the connection direction A and the separation direction B from the reference position according to the spring constant of the diaphragm 5. Here, considering the timing of the magnetic force acting on the armature 4, the contact is turned on at the reference position (amplitude 0) of the armature 4, the current starts to flow to the electromagnetic drive means 3, and the contact is turned off by a half wavelength. Although the current is interrupted, a predetermined delay d ₁ occurs until the current starts to flow (starts flowing in an equilibrium state) even when the contact is turned on due to the transient phenomenon of the electromagnetic driving means (coil) 3. without stop current soon after contact OFF, the decreases slowly with same through a predetermined delay d _2.

Accordingly, the magnetic force range R acting on the armature 4 does not match the range from the contact ON to the contact OFF, and is shifted by the predetermined delays d ₁ and d ₂ .
Then, when focusing on the vibration state of the armature 4 in the force range R of a state shifted in this manner, in a portion of the movement range T ₁ of the the connecting direction A of the armature 4,
While the armature 4 moves in the connection direction A, the magnetic force acts to pull the armature 4 in the opposite separating direction B, so that the vibration energy of the armature 4 is partially lost, and the energy efficiency is reduced. It is very disadvantageous in terms of. Conventionally, such inefficiency in energy conversion has been dealt with by increasing the size of the armature 4 or the like, but this is not preferable because the horn becomes large.

In order to solve such an inconvenient state, for example, a model as shown in FIG. 5B is ideal. That is, the magnetic force range R is increased by a larger delay D ₁ , D ₂
Shifting through, by matching the movement range T ₂ and force range R in the separating direction B of the armature 4, if the armature 4 to move to separating direction B is accelerated by the magnetic force, efficient energy conversion line Will be

The present invention has been made by paying attention to such a conventional technique, and provides a horn which enables such efficient energy conversion.

[0010]

According to the horn of the present invention, in order to achieve the above-mentioned object, the armature has a second armature.
The contact member is engaged in both the connection direction and the separation direction with respect to the contact member, and the movement allowance is secured from the amplitude reference position of the armature to each engagement point with the first contact member in both directions. is there.

[0011]

According to the horn of the present invention, the armature engages with the second contact member after a predetermined moving allowance in the connecting direction and the separating direction, so that the second contact member is in contact with the first contact member. As a result, the timing at which the contacts are turned on and the contacts are turned off is greatly shifted. Accordingly, since the magnetic force range in which the electromagnetic driving means tries to pull in the separating direction and the range in which the armature tends to move in the connecting direction are reduced, the degree of energy loss of the armature is reduced, and the efficiency is reduced. Energy conversion becomes possible. In particular, if the moving margin is set so that the magnetic force range by the electromagnetic driving means substantially matches the moving range of the armature in the separating direction, ideal energy efficiency with no energy loss can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to FIGS.
It will be described based on. In addition, the same reference numerals are given to portions common to the related art, and overlapping description will be omitted.

A first contact member 16 constituting an interrupter 15 is attached to a part of a case 13 of the horn according to this embodiment via an insulating elastic member 14. Under the first contact member 16, a second contact member 17 that can be connected to the first contact member 16 is provided. A pivot pin 18 is formed on the second contact member 17. By attaching the pivot pin 18 to the tip of a support piece 19 fixed to the case 13, the entire second contact member 17 is connected in the connection direction A and It rotates in the separating direction B. There is a slight sliding force between the rotation pin 18 and the support piece 19, and a spring 20 is provided between the second contact member 17 and the support piece 19. The spring 20 has a small urging force (however, slightly stronger than the above-mentioned sliding force).
The contact member 17 is in contact with the contact member 17 from below, and the second contact member 17 is rotated at a slow speed in the connection direction A, and the electrical connection between the support piece 19 and the second contact member 17 is established. It works to make sure.

An upper engagement piece 22 and a lower engagement piece 23 are formed on the second contact member 17 as "engagement points" protruding toward the armature 21 at predetermined intervals. ing. On the other hand, a flange 21 a protruding outward is formed on a side surface of the armature 21, and the flange 21 a is formed on the upper engagement piece 2 of the second contact member 17.
2 and the lower engagement piece 23. As shown in FIG. 1, the flange 21a is located at the reference position of zero amplitude where the diaphragm 5 is not vibrating.
And the lower engagement piece 23, and moving margins L ₁ and L ₂ at equal intervals are secured on both upper and lower sides. Further, one electric wire 24 of the electromagnetic driving means 3 is connected to the first
The other electric wire 25 is connected to the contact member 16 and the case 13
It is connected to the inner surface of Therefore, current flows from the case 13 to the support piece 19, and current flows from the support piece 19 to the second contact member 17 via the rotation pin 18 and the spring 20.

Next, the operation of the horn according to this embodiment will be described. First, let the state of FIG. 1 be a start state,
The switch of the power supply 10 is turned on. Then, an electric current flows through the electromagnetic driving means 3, so that the pole 2 of the electromagnetic driving means 3 becomes an electromagnet and attracts and moves the armature 21 in the separating direction B. That is, the flange 21a of the armature 21 through the movement margin L ₂ lower from the reference position of the amplitude 0 (Fig. 1 state), (see FIG. 2A) hits the lower engaging pieces 23, the lower the second contact member 17 (See FIG. 2B) to separate the second contact member 17 from the first contact member 16 and turn off the contact. Even if the contact is turned off, the armature 21 moves by a predetermined amount in the separating direction B due to the inertial force.
Armature 21 rebounds on pole 2).

Then, the diaphragm 5 starts to move in the connection direction A by the elastic restoring force, and the flange 2 of the armature 21 is moved.
1a is rotated per from below into the upper engaging pieces 22 firstly through a moving allowance L ₁ (see Fig. 2C), the second contact member 17 in the connecting direction A, a second contact member 17 to the first contact member 16 Make contact (see FIG. 2D). As a result, although the contact is turned on, the inertia force of the armature 21 and the current flowing through the electromagnetic driving means 3 are delayed due to a transient phenomenon, and the magnetic force does not act immediately. Therefore, the second contact member 17 further moves in the connection direction A side. (See FIG. 2E). In the meantime, the pole 2 of the electromagnetic driving means 3 becomes an electromagnet, and draws the armature 21 in the separating direction B again (FIG. 2F). By vigorously repeating such an operation, the diaphragm 5 reciprocates and generates sound waves.

Here, the vibration system of the armature 21 will be described. The armature 21 has a case 13
The armature 21 having a constant mass (m ₁ ) is connected to the case 13 by the diaphragm 5 having a constant spring constant (k ₁ ). I have. Therefore, the eigenvalue (f ₁ ) of this spring system is expressed by the following equation (1). f ₁ = (1 / 2π) · (k ₁ / m ₁ ) ^0.5 ───────── (1)

In this embodiment, k ₁ = 132300 N /
m, m ₂ = 0.027 kg, and the frequency of the sound wave (eigenvalue f ₁ ) is about 350 Hz.

On the other hand, since the second contact member 17 is also rotatable about the pivot pin 18 and the spring 20 is combined with the second contact member 17, the second contact member 17 also uses the pivot pin 18. A spring system with a center is formed. Assuming that the mass of the second contact member 17 is (m ₂ ) and the spring constant of the spring 20 is (k ₂ ), the eigenvalue (f ₂ ) of this spring system is
The following equation (2) is obtained. f ₂ = (1 / 2π) · (k ₂ / m ₂ ) ^0.5 ───────── (2)

The characteristic value (f ₂ ) of the second contact member 17
However, if the value is larger than the characteristic value (f ₁ ) of the armature 21, the second contact member 17 will move irrespective of the engagement with the armature 21, so that the characteristic value (f ₂₎ of the second contact member 17 ) Needs to be smaller than the eigenvalue (f ₁ ) of the armature 21. Therefore, the smaller the spring constant (k ₂ ) of the spring 20, the more preferable. In this embodiment, the characteristic value (f ₂ ) of the second contact member 17 is about 1 / the value (f ₁ ) of the armature 21.
6 is set. The mass (m) of the second contact member 17
_It is not preferable to make ₂ ) too large because the inertia of the second contact member 17 is increased and the movement of the second contact member 17 cannot be controlled.

The operation timing as described above is shown in FIG. When attention is paid to the amplitude of the armature 21 shown at the top, the armature 21 does not hit the pole 2 in the first movement in the separation direction B, so that the armature 21 returns to the connection direction A gently. 21 is repelled by hitting the pole 2, so that the movement in the separation direction B is instantaneously switched to the movement in the connection direction A.

The flange 21a of the armature 21
Are engaged with the upper engagement piece 22 and the lower engagement piece 23 through the fixed movement allowances L ₁ and L ₂ , so that the movement allowances L ₁ and L ₂ are added to the movement allowances L ₁ and L ₂ . Since the corresponding delay is added, the magnetic force range R is greatly shifted by D ₁ and D ₂ ,
And the magnetic force range R, will be the moving range T ₂ of the the separating direction B of the second rotating member 17 are matched, it acts to accelerate the movement of the separating direction B of the second rotating member 17 . Therefore, there is no energy loss, and ideal energy efficiency can be obtained. As can be seen from the graph representing the amplitude of the second rotating member 17 in FIG.
When no force is applied to the armature 21 from the armature 21, the second rotating member 17 is slightly rotated in the connection direction A at a constant gradient θ corresponding to the urging force of the spring 20. Therefore, no matter at what timing the switch is turned off, it is possible to always start from the state shown in FIG.

In the above description, the magnetic force range R and the second
An example is shown in which fully align your and moving range T ₂ of the the separating direction B of the rotary member 17, the present invention is not intended only necessarily fully be matched, moving allowance L _1, L
By providing ₂ , the magnetic force range R and the moving range T _{2 in} the separating direction B are increased as much as possible to improve the energy efficiency.

[0024]

The horn according to the present invention has the contents as described above, and the armature engages with the second contact member after a predetermined moving margin in the connecting direction and the separating direction. Therefore, the timing at which the second contact member is turned on and the contact is turned off when the second contact member is presented as the first contact member is greatly shifted. Accordingly, since the magnetic force range in which the electromagnetic driving means tries to pull in the separating direction and the range in which the armature tends to move in the connecting direction are reduced, the degree of energy loss of the armature is reduced, and the efficiency is reduced. Energy conversion becomes possible. In particular, if the moving margin is set so that the magnetic force range by the electromagnetic driving means substantially matches the moving range of the armature in the separating direction, ideal energy efficiency with no energy loss can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a horn according to an embodiment of the present invention.

FIGS. 2A to 2F are diagrams illustrating the movement of a second rotating member.

FIG. 3 is a graph showing operation timing.

FIG. 4 is a sectional view showing a conventional horn.

FIGS. 5A and 5B are graphs each showing a relationship between an armature amplitude and a magnetic force range.

[Explanation of symbols]

Reference Signs List 3 electromagnetic drive means 5 diaphragm 13 case 15 interrupter 16 first contact member 17 second contact member 21 armature 22 upper engagement piece (engagement point) 23 lower engagement piece (engagement point) A connection direction B separation direction L ₁ , L ₂ Movement allowance R Magnetic force range

Claims (2)

(57) [Claims] An armature is provided at a central portion of a diaphragm having a peripheral portion fixed to a case, and a first contact member fixed to the case is engaged with the armature to contact / separate from the first contact member. An audible sound is generated by providing an interrupter comprising a freely movable second contact member, and reciprocatingly vibrating the armature in a connecting direction and a separating direction by electromagnet means which is intermittently excited through the interrupter. Wherein the armature engages the second contact member in both the connecting direction and the detaching direction, and moves from the amplitude reference position of the armature to each engagement point with the second contact member in both directions. A horn that has a guaranteed fee. 2. The horn according to claim 1, wherein the moving margin is set such that the magnetic force range of the electromagnetic driving means substantially matches the moving range of the armature in the separating direction.