JPH0915060A - Switch structure for electronic clinical thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance achievement degree of automation in the assembling work of switch and to prevent intrusion of foreign matter due to breakage of film or defective bonding by eliminating a film applied around a push button part in order to close a cut groove. SOLUTION: In the switch structure for electronic clinical thermometer, a push button part 24 is provided on the surface of casino 22 of an electronic clinical thermometer 20 and a contact piece 9 and terminals 10a, 10b are arranged thereunder so that the contact piece 9 is depressed together with the push button part 24 and brought into contact with the terminals 10a, 10b. A flexible part 25 is provided around the push button part 24 and the casing 22 is molded integrally with the push button part 24 through the flexible part 25 so that the push button part 24 is depressed through resilient deformation of the flexible part 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch structure of an electronic clinical thermometer, and more particularly to a switch of an electronic clinical thermometer of a type in which a contact piece and a terminal are brought into contact with each other by pushing a push button portion provided on the surface of the casing. Regarding the structure.

[0002]

2. Description of the Related Art Generally, a conventional electronic thermometer 1 has an external shape as shown in FIG. 5, a display window 3 for digitally displaying the measured body temperature on the surface of a plastic casing 2, and a switch. A push button portion 4 for turning on and off is provided adjacent to the push button portion 4.

As shown in FIGS. 5 and 6, one side of the push button portion 4 is connected to the casing 2 by a thin hinge 6, and the remaining three sides are cut into a groove 7 between them.
And has a rectangular shape, and the push button portion 4 is also integrally formed when the casing 2 is molded.

Further, in order to prevent dust, dirt, moisture and the like from entering the casing 2 through the cut groove 7 formed around the push button portion 4, as shown in FIG. The peripheral portion of the portion 4 is attached to the lower surface of the casing 2 with an adhesive material 17.
It is covered with the film 16 attached in (1).

In this type of push button switch, as shown in FIG. 7, a contact piece 9 and a pair of terminals 10a and 10b which are switched by the pushing operation of the push button portion 4 are arranged inside the casing 2. There is. Contact piece 9
Is a block of conductive rubber,
It is fitted and held by the movable portion 12 of the middle frame body 11 arranged in the casing 2. The movable portion 12 is provided at the tip of the thin plate portion 13, and is pushed down by the thin plate portion 13 bending downward, and the contact piece 9 also moves downward accordingly. On the other hand, the terminals 10a and 10b are connected to the inner frame 1
It is provided adjacent to the upper surface of the circuit board 14 held by No. 1, and when the movable portion 12 is pushed down, both of them come into contact with the contact piece 9 at the same time. It should be noted that an electronic component 15 and the like which are operated by switching the terminals 10a and 10b are mounted on the lower surface of the circuit board 14.

In the switch structure having such a structure, as shown in FIG. 8, when the push button portion 4 is pushed down by the finger 8, the thin hinge portion 6 is bent and the push button portion 4 is pushed down together with the film 16. At this time, push button part 4
The movable portion 12 of the middle frame body 11 is pressed by the lower surface of the contact piece 9
Moves downward, and the lower surface of the contact piece 9 is connected to the terminals 10a, 10b.
Contact Then, the contact piece 9 comes into contact with the terminal 1
The switches 0a and 10b are electrically connected and the switch is turned on.
On the other hand, when the finger 8 is released, the push button portion 4 and the movable portion 12 are elastically restored, the push button portion 4 returns to its original position, the contact piece 9 and the terminals 10a and 10b are separated, and the switch is turned off. Become.

[0007]

In the electronic thermometer 1 having the above-mentioned structure, it is difficult to automate the entire assembly line. Although the assembling work such as assembling the inner frame body 11 into the casing 2 or assembling and holding the circuit board 14 in the inner frame body 11 can be automated, the film 16 is attached around the lower surface of the push button portion 4. This is because only the work for closing the kerf 7 had to rely on manual work.

Further, since the cut groove 7 provided around the push button portion 4 is closed by the film 16, there is adhesion failure even at one place, or the film 16 is repeatedly attached to the film 16 by repeated press deformation by the push button portion 4. If there is tearing, dust, dirt, moisture, etc. will come from the casing 2
There was a risk that it would invade inside.

Therefore, the object of the present invention is to eliminate the above-described film sticking work to increase the automation achievement rate of the assembly work, and to eliminate the risk of foreign matter entering due to defective adhesion or film tearing. To do.

[0010]

In order to solve the above problems, the present invention provides a push button portion on the surface of a casing of an electronic thermometer, and a contact piece and a terminal are arranged below the push button portion. When pressed, the contact piece is also pushed down, and in a switch structure of an electronic thermometer in which the contact piece and the terminal are brought into contact with each other, a flexible portion is provided around the push button portion, and the flexible portion is interposed. The casing and the push button portion are integrally formed, and the push button portion can be pressed by elastically deforming the flexible portion without providing a cut groove around the push button portion unlike the conventional case. It is characterized by

[0011]

According to the above-mentioned means, by providing the flexible portion around the push button portion, the push button can be pressed by elastically deforming the flexible portion, and accordingly the contact piece is also attached. Then, the contact piece is brought into contact with the switch terminal to establish continuity.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a switch structure of an electronic thermometer according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an external view of an electronic thermometer 20 according to the present invention, and FIG. 2 is an enlarged view of a main part. The external shape of the electronic thermometer 20 is almost the same as the conventional one, and the display window 23 and the push button portion 24 are provided adjacent to each other on the surface of the plastic casing 22, but the shape of the push button portion 24 is Unlike the conventional one, it has a round shape. Around the push button portion 24, a concentric flexible portion 25 is provided so as to surround the push button portion 24. As shown in FIG. 3, the flexible portion 25 is formed integrally with the casing 22 and the push button portion 24, but by forming the flexible portion 25 to be thinner than the casing 22 and the push button portion 24, the push button When the portion 24 is pushed, elastic bending deformation can be performed.

As described above, in this embodiment, since the flexible portion 25 is provided, it is not necessary to provide a conventional cut groove between the casing 22 and the push button portion 24. There is no possibility that dust or the like will enter the casing 22.

Although the push button portion 24 and the flexible portion 25 are molded in the same material as the casing 22 by one color in the above embodiment, they need not be molded together in the same material. It is also possible to use an elastomer as the material of 24 and the flexible portion 25, and to construct by two-color molding. In this case, since the elastomer itself has flexibility, it is not necessary to form the flexible portion 25 into a thin shape, and the feel when pressing the push button portion 24 is also good, and further, the flexible portion 25 Since the width of the concentric circles can be narrower than the above, the appearance is also excellent.

As shown in FIG. 3, the push button portion 2 is provided.
4, a contact piece 9 in which conductive rubber is formed in a block shape and a pair of terminals 10a and 10b are provided below the same as in the conventional example.
Is arranged. The contact piece 9 is fitted and held in the movable portion 12 of the middle frame body 11, and the terminals 10 a and 10 b are arranged on the upper surface of the circuit board 14. Electronic components 15 and the like are mounted on the lower surface side of the circuit 14.

Therefore, in the switch structure of the present embodiment having the above-described structure, as shown in FIG. 4, when the push button portion 24 is pushed by the finger 8, the flexible portion 25 around the push button portion 24 becomes concentric. The bending is depressed as a whole and the push button portion 24 is pushed down. Further, the lower surface of the push button portion 24 is the inner frame body 11
The movable part 12 is pushed down and the contact piece 9 is moved downward to bring the lower surface of the contact piece 9 into contact with the terminals 10a and 10b. Then, when the contact piece 9 contacts, the terminals 10a and 10b are electrically connected to each other, and the switch is turned on. On the other hand, when the finger 8 is released, the flexible portion 25 and the movable portion 12 are elastically restored,
The push button portion 24 returns to its original position and the contact piece 9
The terminals are separated from the terminals 10a and 10b, and the switch is turned off.

[0017]

As described above, according to the switch structure of the electronic thermometer according to the present invention, the flexible portion is provided around the push button portion, and the casing and the push button portion are provided via this flexible portion. Since it is integrally formed, it is not necessary to provide a cut groove or a film around the push button portion as in the conventional case. Therefore, it is not necessary to attach the film by hand to close the cut groove, and the automation achievement rate of the assembly work of the electronic thermometer can be increased accordingly.

Further, since there is no need for a film around the push button portion for closing the groove as in the conventional case, the inside of the casing has a completely sealed structure, and foreign matter and moisture from the outside into the casing. I was able to completely eliminate the fear of intrusion.

[Brief description of the drawings]

FIG. 1 is an external view of an electronic thermometer according to the present invention.

FIG. 2 is an enlarged plan view of a push button portion of the electronic thermometer shown in FIG.

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

FIG. 4 is a cross-sectional view showing a state when a push button portion is pressed in FIG.

FIG. 5 is an external view of a conventional electronic thermometer.

6 is an enlarged plan view of a push button portion of the electronic thermometer shown in FIG.

7 is a cross-sectional view taken along the line BB of FIG.

FIG. 8 is a cross-sectional view showing a state when a push button portion is pressed in FIG.

[Explanation of symbols]

 9 contact piece 10a terminal 10b terminal 20 electronic thermometer 22 casing 24 push button part 25 flexible part

Claims (1)

[Claims] 1. A push button portion is provided on a surface of a casing of an electronic thermometer, and a contact piece and a terminal are arranged below the push button portion. When the push button portion is pressed, the contact piece is also pushed down to contact the contact piece. In a switch structure of an electronic clinical thermometer, which is brought into contact with the terminal, a flexible portion is provided around the push button portion, and the casing and the push button portion are integrally molded through the flexible portion, A switch structure for an electronic thermometer, wherein the push button portion can be pressed by elastically deforming the portion.