JPH11248546A - Buzzer attachment structure for electronic thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure capable of obtaining a large buzzer volume at the time of attaching a piezoelectric buzzer composed by sticking a piezoelectric element on a metallic diaphragm inside an electronic thermometer. SOLUTION: A buzzer assembly 1 composed by loading the piezoelectric buzzer 10 and a contactor 40 for electric connection on a planar buzzer pedestal 30 provided with a through-hole 31 for emitting sound in a prescribed shape is inserted to a prescribed clearance inside a case main body 50 capable of housing the buzzer assembly 1 and provided with the terminal part of an electronic circuit for driving the buzzer on an inner surface, the piezoelectric buzzer 10 is attached inside the case main body 50 and the contactor and the terminal part are electrically connected. Also, the piezoelectric buzzer 10 is loaded on the buzzer pedestal 30 by positioning the through-hole 31 for emitting the sound below the piezoelectric element 11 and sticking the plate surface side edge of the metallic diaphragm 12 to the peripheral edge of the through-hole for emitting the sound. For the shape of the through-hole 31 for emitting the sound, a circular shape provided with a diameter equal to or more than the diameter of the piezoelectric element 11 or the shape similar to it is preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a piezoelectric buzzer is mounted in a case body of an electronic thermometer.

[0002]

2. Description of the Related Art Conventionally, as one type of thermometer used for measuring body temperature, the temperature of the skin or mucous membrane surface is measured by using a heat-sensitive electrical element as a sensor, and the temperature considered as body temperature, that is, the equilibrium temperature is measured. 2. Description of the Related Art There is known an electronic thermometer integrally configured to detect a temperature and to report and display the temperature.

[0003] Among such electronic thermometers, a type in which the buzzer sound of a piezoelectric buzzer is used as a means for notifying the end of temperature measurement or the occurrence of an abnormality is usually obtained by attaching a metal diaphragm to a piezoelectric element such as piezoelectric ceramics. The piezoelectric buzzer having the above structure is used. The piezoelectric buzzer is mounted at a predetermined position inside the electronic thermometer, and is driven by a buzzer drive circuit to emit a buzzer sound when notification is required. First, when a signal of a predetermined frequency is sent from the buzzer drive circuit to the piezoelectric buzzer, a predetermined voltage is applied between the metal vibration plate and the electrode of the piezoelectric element, whereby the piezoelectric element has its own characteristic. Vibration occurs at the frequency, and the attached metal diaphragm resonates and emits sound.

As a mechanism for mounting such a piezoelectric buzzer in a case of an electronic thermometer, for example, a mechanism in which the piezoelectric buzzer is directly fixed to a back cover of a case body constituting an outer cover (Japanese Patent Laid-Open No. 64-18031). A device that incorporates various components of an electronic thermometer together with a board module (Japanese Patent Laid-Open No. 9-218106) has been disclosed.

[0005]

However, the piezoelectric buzzer mounted by these mechanisms has a drawback that the vibration of the piezoelectric element and the metal diaphragm is easily hindered. As a result, the buzzer sound pressure drops below the original value, and it is difficult to obtain a sufficient sound volume. When buzzer notification is needed, such as at the end of temperature measurement,
Since the case body of the electronic thermometer is in contact with the human body, etc., which is the object to be measured, the vibration of the piezoelectric buzzer comes in contact with the mechanism that is fixed directly to the back lid part of the case body that constitutes the jacket. Obstructed by the object being measured. Further, in a mechanism in which the shape of the board module on which various components of the electronic thermometer are mounted is processed and incorporated together, the vibration of the piezoelectric buzzer is hindered by the board module. As described above, in the buzzer structure mounted by the conventional mechanism, since the vibration of the piezoelectric buzzer is hindered, a sufficient sound volume has not been obtained, and an improvement in the sound volume has been desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional piezoelectric buzzer mounting structure, and has an improved sound pressure and a buzzer notification sound of a sufficient volume to easily obtain a buzzer notification sound. Its purpose is to provide.

[0007]

That is, the present invention relates to a buzzer mounting mechanism for an electronic thermometer for mounting a piezoelectric buzzer having a piezoelectric element stuck on a metal diaphragm in a case main body. A buzzer assembly having a piezoelectric buzzer and a contact for electrical connection mounted on a plate-shaped buzzer pedestal having a through-hole for use therein can store the buzzer assembly and have a terminal portion of a buzzer driving electronic circuit. The piezoelectric buzzer is inserted into a predetermined gap in the case main body provided on the inner surface, the piezoelectric buzzer is mounted in the case main body, and the contact and the terminal portion are electrically connected, and the piezoelectric buzzer is The sound emitting through-hole is located below the piezoelectric element, and a plate surface edge of the metal vibration plate is attached to a periphery of the sound emitting through-hole, and is mounted on the buzzer base. I have.

[0008] Further, a further feature of the present invention is that the shape of the through-hole for sound emission is a circle having a diameter larger than the diameter of the piezoelectric element or a shape similar thereto.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1A shows a buzzer base according to the present invention,
FIG. 3 is a diagram schematically illustrating a state in which a piezoelectric buzzer is fixed using a double-sided adhesive sheet and a contact for electrical connection is attached to form a buzzer assembly 1. FIG.
(B) is a perspective view showing how the buzzer assembly of the present invention is attached to an electronic thermometer. FIG. 2 is a top view of the buzzer assembly 1, and FIG. 3 is a cross-sectional view taken along a line AA in FIG.

Prior to describing the buzzer mounting structure of the present invention, the buzzer assembly 1 will be described. As shown in FIGS. 1A, 2, and 3, a piezoelectric buzzer 10 according to the present embodiment has a metal vibration plate 12 having a diameter larger than that of a disk-shaped piezoelectric element 11 attached to the lower surface thereof. The outer periphery of the piezoelectric element 11 has a configuration in which an edge of the metal vibration plate 12 protrudes.

In the present embodiment, the piezoelectric buzzer 10 has the structure shown in FIG.
As shown in (a), it is fixed on the double-sided adhesive sheet 20 and mounted on the plate surface of the buzzer base 30. The buzzer pedestal 30 has a circular sound emitting through hole 31 formed therein.
The diameter of the sound emission through hole 31 is slightly larger than the diameter of the piezoelectric element 11 constituting the piezoelectric buzzer 10.
Not to interfere with the vibration of Double-sided adhesive sheet 2
0, similarly, so as not to hinder the vibration of the piezoelectric element 11.
A window 21 having a size substantially equivalent to the size of the sound emitting through-hole 31 is opened, and the double-sided adhesive sheet 20 is formed by adhering the edge of the metal diaphragm to the periphery of the sound emitting through-hole. I have.

The double-sided adhesive sheet 20 only needs to have a minimum area necessary to provide sufficient strength for fixing the edge of the metal diaphragm 12 to the buzzer pedestal 30. It is not necessary that the entire area of the surface in contact with the buzzer base 30 be stuck. And the shape is especially
The shape is not limited to the shape shown in FIG.

The shape of the sound emitting through-hole 31 is also different from that of the piezoelectric element 11.
In order to meet the object of the present invention that the vibration of the piezoelectric element 11 is not hindered, any shape having a diameter equal to or larger than the diameter of the piezoelectric element 11 or a shape similar thereto may be limited to the shapes shown in these drawings. is not. Further, the means for fixing the piezoelectric buzzer to the buzzer pedestal is not limited to sticking with the double-sided adhesive sheet, and application such as application of an adhesive is also possible. In forming the buzzer assembly, the application of the double-sided adhesive sheet and the application of the adhesive may be performed on either the piezoelectric buzzer side or the buzzer base.

In this embodiment, a contact 40 for electrical connection for transmitting an electric signal for driving to the piezoelectric buzzer 10 is provided.
A contact spring formed from a plate-like spring as shown in FIGS. 2 and 3 is used as the contact spring. 2 and 3 show how the contact spring and the piezoelectric buzzer 10 are arranged. As shown in FIG. 2, one end of one contact spring 41 elastically contacts the metal vibration plate 12, and one end of the other contact spring 42 elastically contacts the piezoelectric element 11. The other ends of the contact springs 41 and 42 elastically contact the terminals of the buzzer drive electronic circuit for electrical connection when the buzzer assembly 1 is inserted and stored in the gap in the case body. It has a shape to gain. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 in the direction of the arrow. One end of a contact spring 41 elastically contacts the metal diaphragm 12, and the other end is a buzzer driving electronic device. The figure shows a state where the terminal is bent upward so as to be able to elastically contact the terminal of the circuit. Metal diaphragm 12
Below the piezoelectric element 11 attached to the
1 is formed.

The contact for electrical connection according to the present invention is not limited to a specific shape, but the above-mentioned shape for making an elastic contact is not limited to a piezoelectric buzzer when a buzzer assembly is formed. It is particularly preferable because the fixing strength of the piezoelectric buzzer to the buzzer pedestal can be improved by attaching it after attaching. Other shapes that can be used as contacts include, for example, the use of lead wires and direct contact with the terminals of electronic circuits.

In this embodiment, as shown in FIG.
On the periphery of the sound emission through hole 31 of the buzzer pedestal 30, there is provided a step portion 32 having a shape and a depth substantially fitting to the outer shape of the metal vibration plate 12 and the contact springs 41 and 42 of the piezoelectric buzzer 10. Such a step portion 32 does not necessarily have to be provided.

FIG. 1B shows a buzzer assembly 1 having the above configuration.
FIG. 1C is a perspective view showing a state in which the electronic thermometer is attached to the case main body of the electronic thermometer, and FIG. 1C is a diagram schematically showing a cross section near the rear end of the case main body of the electronic thermometer into which the buzzer assembly 1 is inserted. is there. As shown in FIG. 1 (c), projections 51 are formed on both sides inside the case from the vicinity of the opening toward the distal end. And the buzzer base 30
The buzzer assembly 1 having the piezoelectric buzzer 10 and the contact 40 for electrical connection mounted thereon is slid and inserted into the gap 52 formed by the projection 51 and at the same time, a terminal portion of an electronic circuit for driving the buzzer (illustrated in FIG. Contact) and contact 40
And thereby make an electrical connection.

At this time, the piezoelectric buzzer 10 affixes the periphery of the metal diaphragm 12 to the periphery of the sound emitting through-hole 31.
Since the sound emitting through hole 31 is provided below the piezoelectric element 11, the vibration is not easily hindered. Further, since the buzzer pedestal 30 is not fixed to the outer cover of the case body 50 or the internal board module, vibration of the piezoelectric buzzer 10 is less likely to be hindered.

[0019]

As described above, according to the present invention,
When mounting the piezoelectric buzzer inside the case body of the electronic thermometer, the buzzer mounting structure of the electronic thermometer that improves the sound pressure and easily obtains the buzzer notification sound of sufficient volume because the element that prevents the vibration of the piezoelectric element is eliminated as much as possible Is provided. Further, the simplification of the assembling work of the electronic thermometer can be facilitated.

[Brief description of the drawings]

FIG. 1A is a diagram schematically showing a state of forming a buzzer assembly according to the present invention, FIG. 1B is a perspective view showing a state of attaching the buzzer assembly to an electronic thermometer, and FIG. FIG. 4 is a cross-sectional view near the rear end of the case main body.

FIG. 2 is a top view of a buzzer assembly according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Buzzer assembly 10 ... Piezoelectric buzzer 11 ... Piezoelectric element 12 ... Metal diaphragm 20 ... Double-sided adhesive sheet 21 ... Window part 30 ... Buzzer pedestal 31 ... Sound emission through hole 32 ... Step Part 40: Contacts 41, 42 for electrical connection Contact spring 50: Case body 51: Projection 52: Gap

Claims (2)

[Claims] 1. A buzzer mounting structure for an electronic thermometer in which a piezoelectric buzzer having a piezoelectric element adhered to a metal vibration plate is mounted in a case body, wherein a plate-shaped buzzer having a through hole for sound emission having a predetermined shape. A buzzer assembly comprising a piezoelectric buzzer and a contact for electrical connection mounted on a pedestal is provided in a case body in which the buzzer assembly can be stored and a terminal portion of an electronic circuit for driving a buzzer is provided on an inner surface. Inserted in a predetermined gap, the piezoelectric buzzer is mounted in the case body, the contacts are electrically connected to the terminals, and the piezoelectric buzzer is
The sound emitting through-hole is located below the piezoelectric element, and a peripheral edge of the metal vibration plate is attached to a periphery of the sound emitting through-hole, and is mounted on the buzzer base. Buzzer mounting structure for electronic thermometer. 2. A buzzer mounting structure for an electronic clinical thermometer, wherein the sound emitting through-hole has a circular shape having a diameter equal to or greater than the diameter of the piezoelectric element or a shape similar thereto.