JPH10322424A - Vibrator and call reception device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the sensitivity by a human body about vibration sufficiently by adhering a piezoelectric element to both front and rear sides of an elastic plate and fixing a mass to one end of the elastic plate. SOLUTION: An elastic thin and long plate 3 that is made of a stainless steel, a spring steel, a phosphorus bronze or a toll steel has conductivity and high elasticity, the plate 3 is twisted (2) at the middle in the lengthwise direction. The twist angle is preferably within a range of 20-90 deg., and a piezoelectric element 4 is adhered to both front and rear sides of the elastic plate 3 that is extended horizontally or vertically around the middle part with the twist 2. The piezoelectric element is made of a proper material such as a binary system like a lead ziroconate titanate or a ternary system like a composite perovskite oxide Pb(Zr, Ti)O3 , or a lithium niobate (LiNbO3 ) single crystal. A mass 5 properly shaped to be a square tip, a rod tip, a trapezoidal tip, or a cone tip is fixed to one end of the elastic plate 3 by a proper means such as adhesion with a thermosetting adhesive like epoxy resin, screw fastening, or spot welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating body which is incorporated in a receiving device such as a portable telephone or a pager and which allows a human body to sense an incoming call from outside and a receiving device using the same.

[0002]

2. Description of the Related Art Hitherto, in a receiving device built in a cellular phone or the like, means for detecting an incoming call from the outside by a human body include sounding and mechanical vibration. In contrast, the term "pronunciation" refers to a method in which an incoming call from an external device is received and a sounding body incorporated in the receiving device causes a sound in an audible frequency range to be sensed by the human body. The term "mechanical vibration" refers to an incoming call from the outside. In response to this, a mechanical vibration is induced from a vibrating body incorporated in the receiving device to be sensed by the human body. Here, the vibrator uses the one that causes vibration by the eccentric rotation of the mass body 32 by the coreless motor 31 as shown in FIG. There is a piezo bimorph. Here, reference numeral 42 denotes an elastic plate serving as a substrate to which the piezoelectric element is adhered, and reference numeral 43 denotes a mass body for increasing vibration stress and vibration amplitude.

[0003]

2. Description of the Prior Art Among the above-mentioned prior arts, the one based on sound generation not only causes discomfort to the audible people but also causes annoyance. The battery, which is the power supply for the coreless motor, is extremely depleted and requires frequent replacement. In addition, permanent magnets and copper wire coils are required, making it difficult to reduce the size and weight. However, there is a problem that the sensitivity to the human body is not sufficient in the conventional method, so that the human body cannot be reliably detected.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a vibrator in which the sensitivity of a human body, which is a drawback of the piezoelectric bimorph, is sufficiently increased while maintaining the superiority of the piezoelectric bimorph among the aforementioned means for detecting an incoming call to the human body. And a receiving device using the same.

[0005]

Means for solving the problem will be described below with reference to FIGS. 1 and 2. The vibrating body 1 according to the present invention is an elongated elastic plate 3 in which a twist 2 is inserted in a middle part in the longitudinal direction, and each elastic plate 3 extends left and right or up and down around the middle part in the longitudinal direction. And a structure in which the mass element 5 is fixed to one end of the elastic plate 3. The receiving device 6 according to the present invention has a configuration in which the vibrating body 1 according to the present invention is built in the receiving device 6 and the other end of the vibrating body 1 on which the mass body 5 is not fixed is fixed in the receiving device. It can be made to be cantilevered.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The elastic plate 3 used in the vibrator according to the present invention is an elongated elastic plate made of any one of stainless steel, spring steel, phosphor bronze, tool steel and the like, and having conductivity and high elasticity. The one in which the twist 2 is inserted in the middle part in the longitudinal direction is used. However, the angle of the twist 2 is set in the range of 20 ° to 90 °, and the piezoelectric elements 4 are attached to both front and back surfaces of each elastic plate 3 extending right and left or up and down around the middle part where the twist 2 is inserted. . This is what is called a bimorph. Here, the piezoelectric element 4 to be attached to the elastic plate 3 is not limited to the two-sided attachment of the elastic plate 3 and there is a problem that the bending displacement of the elastic plate cannot be large. It may be sticking.

The piezoelectric element 4 attached to the elastic plate 3 is made of a binary or ternary composite perovskite oxide such as lead zirconate titanate Pb (ZΓ, Ti) O ₃ , lithium niobate (LiNbO ₃ ). Crystal, lithium tantalate (Li
An appropriate material such as TaO ₃ ) single crystal is used. The bonding of the piezoelectric element 4 to the elastic plate 3 is performed by applying a heating and pressurizing treatment using a thermosetting adhesive such as an epoxy resin or a polymer film having an adhesive property.

At one end of an elastic plate 3 which is one of the components of the vibrating body 1, a mass body 5 having an appropriate shape such as a square piece, a bar piece, a trapezoidal piece, a conical piece is fixed. Here, the mass 5 is fixed by using a thermosetting adhesive such as an epoxy resin.
It is performed by an appropriate means such as screwing and spot welding.

In order to cause the flexure vibration from the vibrator 1, power must be supplied to the piezoelectric element 4. However, the power supply is performed by externally applying an alternating voltage to the electrodes formed on the surface of the piezoelectric element so that an electric field is formed in the thickness direction of the piezoelectric element 4. Here, the connection of the power supply line for applying the alternating voltage is performed such that both electrodes formed on the outer surface of the piezoelectric element 4 attached to the front and back surfaces of the elastic plate have the same potential.

The vibrating body 1 according to the present invention is built in a receiving device 6. However, the built-in form is a so-called cantilever support in which the other end of the vibrating body 1 on which the mass body 5 is not fixed is fixed in the receiving device.

[0011]

The vibration frequency range in which a human body senses an incoming call from outside by mechanical vibration is 50 to 200 Hz. However, if the vibrator 1 is configured to resonate within the vibration frequency range and an alternating voltage is externally applied to the piezoelectric element 4, the piezoelectric element 4 expands in a positive half cycle and contracts in a negative half cycle. In response to this, the elastic plate 3 serving as the piezoelectric element sticking substrate causes a bending bending vibration having a cycle corresponding to the frequency of the alternating voltage. Here, the bending and bending vibration of the elastic plate 3 becomes a periodic external force, and reciprocating linear vibration is caused by the inertial force generated from the mass body 5 fixed to one end of the elastic plate constituting the vibrator. The incoming call is perceived as a skin stimulus by the human body that comes into contact therewith via the receiving device 6.

Incoming device 6 using vibrator 1 according to the present invention
The manner of sensing by the skin stimulus resulting from the conventional receiver differs significantly from that provided by the conventional receiving device. This is because the elastic plate 3 which is a component of the vibrating body 1 according to the present invention is provided with the torsion 2 at an intermediate portion in the longitudinal direction thereof, and is thus supplied from the mass body 5 constituting the vibrating body 1 by power supply. This is because the vibration is a combined vibration in the vertical direction and the horizontal direction or in the diagonal direction opposite to the diagonal direction, and as a result, the vibration position of the mass body 5 reciprocates in the horizontal direction over time to expand the vibration area.

The reason why the vibration generated from the receiving device 6 according to the present invention can cause the above-described vibration is that the torsion 2 placed in the elastic plate 3 constituting the vibrating body 1 is centered on the left and right sides. Alternatively, the vibration induced from the elastic plate 3 extending vertically has anisotropy. In this regard, since the vibration from the receiving device by the conventional vibrator is a one-point vibration that vibrates in only one direction, the vibration area is small. Therefore, the sensitivity of the human body due to skin stimulation is not always sufficient.
On the other hand, the vibration caused by the receiving device 6 according to the present invention is a compound / linear vibration that vibrates in the horizontal direction or the reverse diagonal direction with the lapse of time in addition to the vertical direction or the diagonal direction. Irrespective of the contact state of the human body, the human body can be sensed and the sensitivity due to skin irritation becomes sufficiently high.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is 35 mm long and 5 m wide.
m, a 90 ° twist 2 is inserted into the middle portion of the elastic plate 3 made of stainless steel (SUS304) having a thickness of 0.5 mm in the longitudinal direction, and each of the elastic plates 3 extending right and left around the middle portion. Piezoelectric element 4 made of lead zirconate titanate having a length of 12 mm, a width of 4 mm, and a thickness of 0.1 mm on the front and back surfaces
Affix. At one end of the elastic plate 3, a 5 mm square metal piece made of a cube is fixed as a mass body 5, and at the other end, the elastic plate 3 is vertically extended to a wide surface of the receiving device 6 at any place in the receiving device. Or, it is constituted by fixing it obliquely.

[0015]

The first effect of the present invention is that the vibration caused by the terminating device 6 according to the present invention is applied not only vertically or obliquely to the wide surface of the terminating device 6 but also horizontally or reverse obliquely with time. This is a composite / linear vibration that vibrates also in the direction, so that it is possible to reliably detect the incoming call to the human body regardless of the state of contact of the receiving device 6 with the human body.

The second effect of the present invention is that the so-called bimorph structure in which the piezoelectric elements 4 are adhered to the front and back surfaces of the elastic plate 3 as the vibrator 1 according to the present invention is formed in two pairs on one elastic plate 3. As a result, the vibration stress and vibration amplitude induced from the vibrating body 1 are larger than those of the prior art, so that the sensitivity to the human body through skin stimulation can be made sufficiently high.

[Brief description of the drawings]

FIG. 1 is a side view of a vibrating body according to the present invention.

FIG. 2 is an internal view of a receiving device incorporating a vibrating body according to the present invention.

FIG. 3 is a front view of a conventional vibration body.

FIG. 4 is a plan view of another conventional vibrating body.

[Explanation of symbols]

 1. Exciter 2 Twist 3. Elastic body 4. Piezoelectric element 5. Mass body 6. Receiving device 31. Coreless motor 32. Mass body 41. Piezoelectric element 42. Elastic plate 43. Mass body

Claims (3)

[Claims] A piezoelectric element is provided on both front and back surfaces of an elongated elastic plate having a middle portion in the longitudinal direction twisted and extending left and right or up and down around the middle portion in the longitudinal direction. A vibrating body having a configuration of sticking and a configuration of fixing a mass body to one end of the elastic plate. 2. The vibrating body according to claim 1, wherein the angle of the twist to be inserted into the intermediate portion in the longitudinal direction of the elastic plate is in the range of 20 ° to 90 °. 3. A structure in which the vibrating body having the structure of claim 1 is built in a receiving device, and a structure in which the other end of the vibrating body on which the mass body is not fixed is fixed in the receiving device and cantilevered. An incoming device made of.