JPS5927653Y2 - Electronics - Google Patents

Description

[Detailed description of the invention] This invention relates to an electronic device in which a printed circuit board carrying an electronic circuit including a flat IC such as a dual in-line IC or a flat package IC is housed in an upper case and a lower case. In particular, the present invention relates to a push button switch that controls the electronic circuit, which is placed above the IC so that the IC also serves as reinforcement for supporting the push button switch, and the outer shape of the casing is made more compact.

Hereinafter, an embodiment of the electronic device of the present invention shown in the drawings will be described. Reference numeral 1 is a digital display type pulse rate meter, and this pulse rate meter 1 has a pulse rate sensor 2 attached to the user's earlobe as shown in FIG.
The pulse rate sensor 2 extracts the pulse rate in synchronization with the user's pulse rate, electrically processes it in the pulse rate meter 1, and displays the user's pulse rate on the display window 3. is displayed numerically.

In this pulse rate meter 1, reference numeral 4 denotes a printed circuit board on which an electronic circuit for electrically processing the pulse pulses is mounted. Along with electronic circuit components such as 6b, a one-chip microcomputer IC7, which is a dual in-line flat type IC that calculates the pulse rate by calculating the pulse rate, is attached.

8 is a push button switch that controls this electronic circuit, and this push button switch 8 has five sets of switch parts 9a, 9b, 9C, and 9d.
, 9e, and five sets of push buttons 11a located above these switch parts 9a...9e to short-circuit these switch parts 9a...9e, 11 b , 11 C, 11 d , 11
This switch board 10 is positioned above the microcomputer IC 7 and connected to the printed circuit board 10 by a plurality of lead wires 13. are doing.

Furthermore, 14 is an upper case having the above-mentioned display window 3, and this upper case 14 has five through holes 15a, 15b, 15 at a location facing the microcomputer IC7.
C.

15 d and 15 e are drilled, and these through holes 1
A pair of hooks 16 and 16 for hooking and fixing the edge of the switch board 10 are provided on the back surface of the upper case 14 with the edges 5a, 15e and 5a in between, projecting inward.

Also, 17 is a lower case paired with this upper case 14,
A protrusion 18 for supporting the printed circuit board 10 is provided, and a power source battery 1 is provided on the outside of the bottom surface of the lower case 17.
9, and the battery storage recess 20 is closed by a battery cover 21 so as to be openable and closable.

And a push button 11a provided on the elastic plate 12...11
By making the push button switch 8 protrude from the through hole 15a...15e and by locking the switch board 10 onto the hook pieces 16, 16, the push button switch 8 is attached to the upper case 14.
The printed circuit board 4 is attached to the back side of the lower case 1.
7 is sandwiched between the protrusion 18 and the fixing protrusion 22 of the upper case 14 and fixed with the screw 23 to secure the switch board 1.
With the back surface of the microcomputer IC 7 in contact with the top surface of the microcomputer IC 7, the push-pin switch 8 is attached to the upper case 14.
and the microcomputer IC7.

By slightly inclining the facing surfaces of the fixing ridges 21 of the upper case 14 and the ridges 18 of the lower case 17, the printed circuit board 4 is fixed with a slight inclination with respect to the upper case 14 and the first case 17. It is configured as follows.

The electronic device of the present invention is as described above, and in particular, in an electronic device in which a printed circuit board on which an electronic circuit including a biased IC is mounted is installed inside an upper case and a lower case, the IC in the upper case is
A push button switch for controlling the electronic circuit is arranged between the upper case and the IC so that the push button protrudes from the through hole. By suppressing the push button of a push button switch, the operating force applied to the push button switch is spread to the printed circuit board via the flat IC, so there is no risk of damaging the push button switch, and the reliability of the switch can be increased. ,
Furthermore, even if an excessive operating force is applied, the push button switch does not come off the hook and fall into the housing, making it possible to use the push button switch stably for a long period of time.

Furthermore, according to the present invention, the push button switch is placed above the flat IC, which is lower in height than ordinary electronic circuit components, so the overall structure of the casing can be made thinner, resulting in a compact and easy-to-use electronic device. be able to.

[Brief explanation of drawings]

The drawings all show an embodiment of the digital display type pulse rate monitor of the electronic device of the present invention, and Fig. 1 is an overall view of the state of use, Fig. 2
Figure A is a front view, Figure 2 is a side view, Figure 2C is a partially sectional side view, and Figure 3 is an exploded perspective view. 7...Microcomputer IC14...
...Printed circuit board, 14...Top case, 17.
...Lower case, 15a, 15b, 15C, 1
5d, 15e...Through hole, 8...Push button switch.

Claims (1)

[Scope of utility model registration request] In a case in which a printed circuit board carrying an electronic circuit including a flat IC is installed inside an upper case and a lower case, a through hole is bored in a portion of the upper case opposite to the IC, and a push button for controlling the electronic circuit is provided. An electronic device comprising a switch disposed between the upper case and the IC such that a push button of the switch protrudes from the through hole.