JPH0743672Y2 - Electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electronic timepiece having a function of measuring temperature, pressure and the like using a semiconductor sensor.

[Conventional technology]

Conventionally, an example of forming a check terminal portion of an electronic wristwatch is shown in FIGS. 5 and 6. In each drawing, (a) is a plan view, (b) is a sectional view, 3 is a circuit board, and 3e is a check terminal pattern formed by etching a copper foil.

[Problems to be solved by the invention]

In semiconductor sensors, it is necessary to perform offset adjustment and tilt adjustment in order to absorb variations in characteristics, but check terminals for adjustment such as monitor terminals, data transfer terminals, and write terminals are provided in FIGS. 5 and 6. When the pin probe 22 hits the check terminal pattern 3e for adjustment as shown in FIGS. 7 and 8, the circuit board 3 is always bent. When the circuit board is bent, the IC chip is also bent through the bonding portion and the mold, causing a change in the channel length and channel width of the transistor forming the semiconductor sensor, that is, a change in the sensor characteristics. That is, the conventional structure has a fatal defect that the sensor characteristics cannot be accurately measured and the adjusted sensor value deviates from the ideal value.

The present invention eliminates such problems, and its purpose is to provide a high-quality electronic device in which the sensor characteristics cannot be accurately measured after adjustment of the semiconductor sensor and the adjusted sensor value does not deviate from the ideal value. To provide a clock.

[Means for solving problems]

The electronic timepiece of the present invention is an electronic timepiece having a circuit board on which an IC chip having a semiconductor sensor is mounted, and a crystal oscillator conductively connected to the circuit board, wherein the circuit board forms an electric circuit. Conductive wiring is disposed, the conductive wiring has a check terminal portion and a crystal resonator connecting portion to which the crystal resonator is conductively connected, and the check terminal portion is a transparent member formed inside an outer shape of the circuit board. The crystal resonator connecting portion is formed in a cantilever shape in the hole, and the crystal unit connecting portion is arranged near an end portion of a cantilever portion formed by a slit cut inward from the outer peripheral portion of the circuit board. The conductive wiring connecting the connection terminal of the IC chip and the crystal resonator connecting portion is arranged on the slit obliquely or parallel to the longitudinal direction of the slit.

[Action]

Since the electronic timepiece of the present invention is formed in the shape of a cantilever with the check terminal projecting inside the through hole, even if the pin probe hits the pattern (copper pattern) when adjusting to absorb the variation in the characteristics of the semiconductor sensor. Only the foil) is displaced and the circuit board does not bend. Therefore, the characteristics of the semiconductor sensor do not change during and after adjustment.

〔Example〕

Hereinafter, the present invention will be described in detail by taking a high-precision electronic wrist watch that performs temperature compensation of a crystal oscillator by a semiconductor temperature sensor in an IC chip as an example.

In the electronic wristwatch of this embodiment, if the rate temperature characteristic of the crystal oscillator is compensated in the state where the semiconductor temperature sensor changes in characteristic, the temperature characteristic may be tilted or convex and downward, and the annual difference is 10 seconds. It is impossible to guarantee a high accuracy of ~ 20 seconds, so it is necessary to suppress the characteristic changes of the semiconductor temperature sensor as much as possible.

FIG. 1 is a plan view of the electronic wrist watch of this embodiment, and FIG.
Shown in the figure. In FIGS. 1 and 2, reference numeral 1 denotes a CMOS-for analog electronic timepiece having a function of compensating for the secondary temperature characteristic of the crystal unit 2 based on the information of the semiconductor temperature sensor built in the 1a portion. A tuning fork type crystal unit having an IC chip, 2 which oscillates at about 32768Hz and has a secondary temperature characteristic, a flexible circuit board on which the IC chip 1 is mounted by face down boding and a crystal unit 2 is soldered. A base for a watch body that is molded from synthetic resin and has a dowel for positioning each part, a body for receiving and escaping each part, and a metal screw pin for fixing each part. The ground plane 5 is a crystal unit 2, a circuit board 3, a coil 6,
A circuit retainer plate for fixing parts such as the stator 9 to the main plate 4 with screws 14, 15, 16 and 17, 6 is a coil, 7 is a magnetic core of the coil 6, 8 is a coil lead board, 9 is a stator, and 10 is an oxidation for a watch. Silver battery, 11 is a winding stem, 12 is a train wheel setting lever, 13 is a train wheel bridge,
14 to 18 are screws, 19 is a battery negative terminal, 20 is a battery insulating plate, and 21 is a mold for surely mounting the IC chip 1 on the circuit board 3.

FIG. 3 shows a detailed plan view of the circuit board 3. In FIG. 3, 3a is a slit, 3b is a crystal unit mounting portion, 3c and 3d are crystal unit lead patterns, and 3e, 3f, 3g, 3h, 3i, 3j and 3k are check terminal patterns. Check terminal pattern
3e, 3f, 3h, 3i, 3j are formed so as to project into the through hole formed in the circuit board 3, and the check terminal patterns 3g, 3k are inside the slit cut from the outer edge of the circuit board 3. It is formed so as to overhang.

As shown in the plan sectional view and the detailed view of FIG. 3, the circuit board 3 of this embodiment measures the temperature characteristics of each of the semiconductor temperature sensor and the crystal unit 2 formed in the 1a portion of the IC chip 1. For monitoring, a data transfer terminal for adjusting the offset and inclination of the semiconductor temperature sensor in accordance with the temperature characteristics of the crystal unit 2, and a semiconductor in which the transferred data is also incorporated in the IC chip 1. Since the check terminal patterns 3e, 3f, 3g, 3h, 3i, 3j, 3k such as writing terminals for writing in the non-volatile memory are cantilevered overhang patterns, as shown in FIG. Even when the pin probe 22 hits the check terminal pattern when measuring or adjusting the temperature characteristics of the semiconductor temperature sensor, only the pattern (copper foil) is displaced and the circuit board itself is not bent. Therefore, since the IC chip 1 is not bent and the shape of the transistor forming the semiconductor temperature sensor is not changed in the portion 1a, the temperature characteristic of the sensor after adjustment matches the temperature characteristic of the crystal unit 2. In addition, 3e to 3k are thinned in the vicinity of the support portion of the cantilever so that when the pin probe comes into contact, stress concentration occurs in this portion and only the pattern is surely displaced.

In the electronic wristwatch of this embodiment, the circuit board 3 is fixed around the screw 14 and the screw 15, and the IC chip 1
Set the height of the base plate 4a and the bending height of the circuit retainer plate 5 so that the board around is completely free, and increase the distance from the fixed part to the IC chip 1 so that the screws 14 and 15 are loose. At this time, the bending condition of the circuit board near the IC chip 1 is not changed.

Further, in the circuit board of this embodiment, since the slit 3a along the IC chip 1 is provided between the mounting portion of the IC chip 1 and the crystal oscillator 2, the fixed state of the crystal oscillator 2 changes and the circuit board Even if the height of the 3b part changes, the circuit board of the IC chip 1 mounting part does not change. Further, by making the crystal oscillator lead patterns 3c and 3d overhanging the slit 3a substantially parallel to the slit 3a and lengthening them, the change in height caused in the crystal oscillator mounting portion 3b is also caused by the IC chip. I try not to affect.

As described in detail above, in the high-precision electronic wrist watch of the present embodiment, the characteristics of the semiconductor temperature sensor do not change due to the change in the fixed state of the circuit board 3 and the contact of the pin probe, and therefore the sensor is caused by mechanical factors. It is possible to produce a highly reliable high-precision electronic timepiece whose characteristics do not change over time with high yield.

Even if the circuit board alone is made into a fixed state that is almost the same as the state where the circuit board 3 is incorporated into the watch body, the characteristics of the semiconductor temperature sensor do not change when the circuit board 3 is incorporated into the watch body. Since it is possible to measure the temperature characteristics of the crystal oscillator and the sensor in a single state and adjust the temperature characteristics, the device for measurement and adjustment can be downsized and simplified. In the case of the present embodiment, the circuit board 3 is flexible and the temperature characteristics can be measured and adjusted in a line by using the tape (film) carrier method, so that automation of the measurement and adjustment and simplification of the apparatus can be facilitated.

Further, since the high-precision electronic wrist watch of this embodiment can create temperature characteristics in the state of the circuit board alone, after-sales service in the market can also be handled by exchanging the circuit board, reducing the repair cost and the repair period. Is possible.

[Effect of device]

Since the electronic watch of the present invention has the check terminal for adjusting the semiconductor sensor formed in the shape of a cantilever protruding inside the through hole formed in the outer shape of the circuit board, it is possible to absorb the variation in the characteristics of the semiconductor sensor. Even if the pin probe hits during adjustment, only the pattern (copper foil) is deformed and the circuit board itself is not bent. Therefore, the IC chip will not bend and the characteristics of the semiconductor sensor will not change, so the characteristics of the sensor can be measured accurately, and the characteristics of the adjusted semiconductor sensor will be ideal, yielding an electronic watch with a high-quality semiconductor sensor. Can be well served.

Further, in the pattern, the crystal resonator connecting portion to which the crystal resonator is conductively connected is near the end of the cantilevered portion formed by the slit formed by cutting inward from the outer peripheral portion of the circuit board. When the crystal unit comes into contact with other members such as the base plate or the middle frame not only after being completed as a circuit block and assembled into the timepiece body by being arranged in the timepiece body, Can be absorbed by the base of the cantilevered portion.

Therefore, it is possible to reduce the mechanical load on the pad portion which is the electrode of the IC chip and the IC chip itself due to the deformation of the substrate, and to stabilize the reliability of conduction of the IC chip and the internal operation of the IC built-in semiconductor sensor and the like. It is a thing.

In addition, the IC chip pad and the crystal unit connection section are connected to each other by conductive wiring that is arranged diagonally or parallel to the slit longitudinal direction, so that the crystal unit connection section and the IC chip when the circuit block is installed The difference in cross-sectional height between the mounting portion and the mounting portion can be absorbed by the conductive wiring on the slit to prevent the substrate deformation from being transmitted to the IC chip mounting portion.

Therefore, together with the fact that the above-mentioned check terminals are formed by overhanging in the through holes of the circuit board, the crystal unit is connected to the cantilever shape part of the board and the slits formed on the circuit board By arranging the conductive wiring for the crystal oscillator in the, it is possible to maximize the effect of preventing the deformation of the circuit board of the IC chip mounting part and stabilizing the operation of the semiconductor sensor built in the IC chip.

In the embodiment, the electronic wristwatch in which the temperature of the crystal oscillator is compensated by the semiconductor temperature sensor in the IC chip is described as an example, but the present invention is an electronic desk calculator or electronic device having a semiconductor sensor for measuring temperature, pressure, etc. It can also be applied to small electronic devices such as thermometers.

[Brief description of drawings]

FIG. 1 is a plan view of an electronic wrist watch showing an embodiment of the present invention,
2 is a sectional view of the circuit portion of FIG. 1, FIG. 3 is a detailed plan view of the circuit board 3 of the present invention, and FIG. 4 is a sectional view when the pin probe hits the check terminal pattern of the present invention. Figure,
5 and 6 are plan sectional views of the conventional check terminal, and FIGS. 7 and 8 are sectional views when the pin probe hits the conventional check terminal portion. 1 …… IC chip 1a …… Sensor section 2 …… Crystal resonator 3 …… Circuit board 3a …… Slit 3b …… Crystal resonator mounting section 3c, 3d …… Crystal resonator lead pattern 3e to 3k …… Check Terminal pattern 4 ...... Base plate 5 ...... Circuit holding plate 5a ...... Circuit holding plate crystal fixing part 5b, 5c ...... Circuit holding plate bending position 6 ...... Coil 7 ...... Magnetic core 8 ...... Coil lead board 9 ... … Stator 10 …… Silver oxide battery for watch 11 …… Winding stem 12 …… Straining lever 13 …… Wheel train holder 14 ～ 18 …… Screw 19 …… Battery negative terminal 20 …… Battery insulating plate 21 …… Mold

Continuation of the front page (56) Reference JP-A-58-7584 (JP, A) JP-A-50-120870 (JP, A) Actual opening 57-692 (JP, U) Actual opening 61-184973 (JP , U) Actually open 60-23787 (JP, U) Actually open 59-104562 (JP, U) Actually open 61-63864 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An electronic timepiece having a circuit board on which an IC chip incorporating a semiconductor sensor is mounted, and a quartz oscillator conductively connected to the circuit board, wherein the circuit board is a conductive wiring forming an electric circuit. And the conductive wiring has a check terminal portion and a crystal resonator connecting portion to which the crystal resonator is conductively connected, and the check terminal portion is inside a through hole formed inside the outer shape of the circuit board. The crystal resonator connecting portion is formed in a cantilever shape, and is arranged in the vicinity of an end portion of a cantilever-shaped portion formed by a slit cut inward from the outer peripheral portion of the circuit board, An electronic timepiece characterized in that a conductive wiring connecting a connection terminal of an IC chip and the crystal resonator connecting portion is arranged on the slit obliquely or in parallel with a longitudinal direction of the slit.