JPH0318899Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to, for example, a thermometer equipped with a subcase that covers a digital liquid crystal display and electric circuit components of the thermometer.

(b) Conventional technology Conventionally, the digital liquid crystal display of a thermometer has a display protection plate formed of a flat transparent material to protect it from external forces such as water droplets, dust, and shock due to its structure. It is covered from above with an appropriate space, and is further held and fixed on both sides by indicator guides.

(c) Problems to be devised However, since the above-mentioned conventional thermometer has a display protection plate and a display guide made of separate members, it is not possible to use this arrangement as is. has the following problems.

Since the display protection plate and the display guide are formed and disposed as separate members, the number of parts increases, and the number of man-hours for managing and assembling the parts increases, resulting in an increase in costs.

Due to its nature, static electricity flows along the surface of a component. In other words, in a structure in which the display protection plate is formed as a separate transparent flat plate and covers the liquid crystal display and the air circuit components from above, how can the adhesiveness with the case be strengthened and the path of static electricity discharge blocked? Even if it is configured as possible, the electrical circuit will be directly reached through the small gap between the contact surfaces, and due to the short creepage distance, the discharge will be strong, and the destructive force to the electrical circuit components will be large and the degree of damage will be large. It was.

Therefore, the object of this invention is to provide a thermometer that is designed to reduce costs by reducing the number of components and to increase the creepage distance to protect electrical circuit components from damage caused by static electricity.

(d) Means for solving the problem This invention is an electronic thermometer with a digital display, and a display window is formed in the case body of the thermometer, and a sub-substrate that covers the electric circuit part including the display is used. The case is formed into a bottomed box-like body with at least a transparent bottom, the bottom side of the sub-case faces the display window of the case body, and the covering display faces the display window of the case body. The thermometer is characterized in that the subcase is housed and fixed in the case body.

(e) Functions and effects of the invention According to this invention, at least the bottom of the sub-case that covers the electric circuit portion is formed transparent, and the display protection plate and display guide formed of a separate transparent material are eliminated. As a result, the number of parts is reduced, and the management and assembly of the parts can be simplified, making it possible to significantly reduce costs.

Furthermore, because the liquid crystal display and electrical circuit parts are attached to the closed part of the sub-case, which also serves as a display protection plate and is electrically isolated from the outside, static electricity is not discharged directly into the electrical circuit, and the sub-case is electrically isolated from the outside. It flows along a long creepage around the outer circumference of the case.

Therefore, electric circuit components can be protected from destruction due to electrostatic discharge, and this has many practical effects in terms of economy and functionality.

(F) Embodiment of the invention An embodiment of the invention will be described below in detail based on the drawings.

The drawings show an electronic thermometer, and in Figures 1 and 2, the electronic thermometer is shown in its case (case body).
A temperature measuring section 2 and a sub-case 3 are arranged inside the device.

The case 1 has an indicator hole (or window) 4 and a rubber contact hole 5 in its upper surface on the rear end side, a cover hole 6 in its lower surface, and a sub-case hole 7 in its rear surface. It will be done.

The sub-case 3 consists of a transparent box-like body with a bottom.
The closed part is divided into a circuit part 10 to which a liquid crystal display 8 and a printed circuit board 9 are attached, and a battery part 12 to which a battery 11 is attached.After the parts are attached to the circuit part 10 and the battery part 12, the It is inserted into the case 1 through the sub-case hole 7 and fixed.

The circuit section 10 has a vertically elongated display window 13 at the upper end of the closed section and at a position corresponding to the above-mentioned display hole 4.
In addition, contact holes 14 are drilled at positions corresponding to the rubber contact holes 5, and further,
A display mounting hole 15 for mounting the liquid crystal display 8 is integrally formed in the lower part thereof.

The display mounting hole 15 has an appropriate size on each of the four sides from the display window 13 described above, and a step 16 is formed to provide an appropriate space from the display window 13, so that the liquid crystal display 8 can be mounted. ing.

Moreover, a board mounting hole 17 formed to mount the printed circuit board 9 is integrally formed in the lower part thereof.

The board mounting hole 17 is formed so that each of its four sides has an appropriate size relative to the liquid crystal display 8 described above, and a printed circuit board 9 is mounted and fixed therein.

A rubber contact 18 is attached to one end of the printed circuit board 9, and the electrical circuit can be opened and closed from above the case 1 as required.

Further, in the electric circuit portion, at positions corresponding to the connection terminal portions formed at both ends of the electric circuit of the liquid crystal display 8 described above, iter connectors 19 are vertically arranged in parallel and erect. At the same time as it is electrically connected to the display 8, the liquid crystal display 8 is pushed upward and the liquid crystal display 8 is clamped between the step 16 mentioned above.

The battery section 12 has a battery contact therein, and the battery 11 is removably attached thereto, and supplies electricity to the electric circuit section.

The cover 20 has the cover hole 6 of the case 1 described above.
It is fitted and fixed to form a sealed space in the circuit section 10 of the sub-case 3 described above to protect the electric circuit components from intrusion of water droplets, dust, etc.

In addition, a thin hinge 21 is integrally formed in the portion divided into the circuit section 10 and the battery section 12 to form a battery section cover 22 that can be opened and closed to form an airtight space for the battery section 12. The battery 11 is attached and detached by opening and closing it.

FIG. 3 shows the discharge path of the electronic thermometer according to the embodiment, in which electrical circuit parts such as a liquid crystal display 8 and a printed circuit board 9 are attached to the closed part of the electrically cut-off sub-case 3. Therefore, static electricity is not directly discharged to the circuit section 10 but flows along the outer circumference of the sub-case 3.

Therefore, electric circuit components can be protected from destruction due to electrostatic discharge.

Further, as shown in FIG. 4, the discharge path of the conventional electronic thermometer is directly from between the display protection plate 23 and the case 24, which are formed by separate members, to the liquid crystal display 8 of the circuit section 10 and the printed circuit board 9. , display guide 2
Due to the short creepage distance, the electric discharge was powerful and the destructive power to the electric circuit components was large, causing great damage.

However, as described above, this embodiment can solve the above-mentioned problems.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention, with Figure 1 being a longitudinal cross-sectional view of the entire electronic thermometer, Figure 2 being a cross-sectional view taken along line A-A in Figure 1, and Figure 3 being a cross-sectional view of the electronic thermometer. FIG. 4 is a static electricity discharge path diagram corresponding to the AA cross section of FIG. 1, and FIG. 4 is a static electricity discharge path diagram corresponding to FIG. 1... Case, 3... Sub case, 4... Display hole, 8... Liquid crystal display, 9... Printed board, 10
...Circuit section.

Claims (1)

[Scope of Claim for Utility Model Registration] An electronic thermometer with a digital display, a sub-case that forms a display window in the case body of the thermometer and covers an electric circuit portion including the display,
The sub-case is formed into a box-like body with at least a transparent bottom, and the bottom side of the sub-case faces the display window of the case body, and the covering display is arranged so as to face the display window of the case body. A thermometer characterized in that the sub-case is housed and fixed in the case body.