JP2007155594A - Movement for watch with led (light emitting diode) lighting, and watch with led (light emitting diode) lighting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movement for a watch with LED lighting that is compact and thin without a risk causing increase of an IC cost and increase of size by achieving miniaturization of a battery, and to provide the watch with LED lighting. <P>SOLUTION: The movement for the watch with LED lighting comprises a boosting function for performing boosting by a charge pump circuit having no voltage stabilization circuit. The boosting function may be integrally provided with a counting function driving the watch in an integrated circuit. Alternatively, the watch for LED lighting is provided with the movement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is an LED for external illumination used for illuminating a keyhole or the like outside a watch case, for example, in a dark place, or for internal illumination that illuminates the hour hand, minute hand, second hand etc. in the watch case when the time is desired. The present invention relates to a portable timepiece with LED illumination having a light emitting diode). And in such a portable timepiece with LED lighting, it is related with the movement for portable timepieces with LED lighting provided in a timepiece case.

  For example, Patent Literature 1 describes an illuminated timepiece in which an LED is driven by a lithium battery that generates a voltage exceeding a threshold voltage. In such a timepiece with illumination, since the threshold is required to be 1.5 V or more, a lithium battery having a battery voltage of 3.0 V is used to drive the time measuring function and directly drive the LED for illumination.

  For example, in a conventional illuminated watch, a 3.0V lithium ion secondary battery with φ16 mm × thickness 2.0 mm, a clock function IC, and a PFM (pulse frequency modulation) as shown in FIG. It is equipped with an IC for voltage boosting function using a voltage stabilization charger pump circuit by control. When the threshold is 1.5V to 3.0V, such as visible light LED such as red, the LED is turned on with a battery, and blue When the threshold is required to be 3.0 V or more as in the case of the LED of the system color, the output voltage of the battery is increased using the boost function IC, and the LED is lit.

  In the step-up function IC using the voltage stabilizing charger pump circuit by PFM control, the output voltage is detected by the comparator 1 and fed back. When the output voltage decreases, the frequency of the oscillation circuit 2 of the charger pump is increased to increase the frequency of the battery. The output voltage was up.

Japanese Utility Model Publication 64-10693 JP-A-6-162809

  However, for example, a 3.0 V lithium battery has a diameter of 10 mm or more and is difficult to reduce in size. In addition, since the blue LED requires a threshold of 3.0 V or more, sufficient light emission cannot be obtained with a lithium battery alone. For this reason, a voltage boosting function using a voltage stabilization charger pump circuit by PFM control as in the prior art. When the IC is used, when the input voltage decreases when the voltage drops due to battery consumption, the output voltage also decreases, feedback is applied, the current consumption increases, the battery load increases, and further increase in battery capacity is required. There is a problem, and the circuit configuration is complicated, so that it is difficult to integrate with, for example, an IC for timekeeping function, which causes an increase in IC cost and an increase in IC size.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the size of a battery, without causing an increase in IC cost and an increase in IC size and the like, and a movement for a portable timepiece with LED lighting and LED lighting that can be reduced in size and thickness. It is to provide a portable watch with a watch.

  In order to achieve such an object, a first aspect of the present invention is characterized in that a movement for an LED-illuminated portable timepiece is provided with a boosting function for boosting by a charger pump circuit having no voltage stabilizing circuit. The boosting function is preferably provided in an integrated circuit (IC) integrally with a clocking function for driving a timepiece.

  In order to achieve the above-described object, a second aspect of the present invention is a portable timepiece with LED illumination, characterized by comprising the movement for portable timepiece with LED illumination according to the first aspect. In the winding stem of this portable timepiece, at least the LED lighting operation should be performed together with the time setting operation.

  For example, when you want to know the time, use the LED for internal illumination that illuminates the hour hand, minute hand, second hand, etc. in the watch case, for example, and the LED for external illumination used when illuminating the keyhole outside the watch case in a dark place. use. The internal illumination LED is mounted on an integrated circuit mounting circuit board that is provided on the back cover side of the movement and on which the integrated circuit is mounted. Alternatively, it is mounted on an LED-mounted circuit board provided on the dial side of the movement, and the LED-mounted circuit board is provided on the back cover side of the movement to mount the integrated circuit and the movement is provided therethrough. Electrical connection is made via a contact spring.

  According to the present invention, the voltage is boosted by the charger pump circuit that does not have the voltage stabilization circuit, so that the current consumption of the LED is reduced as the battery deteriorates, and therefore, as an LED driving power source that is conventionally restricted to a 3V battery. It is possible to use a 1.5V battery with inferior battery capacity, and to provide a movement for an LED-illuminated portable watch and an LED-illuminated portable watch that can be reduced in size and thickness by reducing the size of the battery. . In addition, it is possible to simplify the circuit configuration and eliminate the risk of increasing the IC cost and increasing the IC size. If the boosting function and the timekeeping function are integrally provided in one integrated circuit, the IC space can be reduced and further miniaturization can be achieved.

  Here, in the winding stem, if at least the LED lighting operation is performed together with the time adjustment operation, it is not necessary to provide a push button switch for performing the LED lighting operation separately from the winding stem for performing the time adjustment operation. The size can be reduced and the design can be improved. Particularly effective for women.

  If an LED for internal illumination that illuminates the inside of the watch case is provided as the LED, the time display unit can be illuminated by illuminating the inside of the watch case even in a dark place, thereby facilitating time confirmation. Further, when an external illumination LED for illuminating the outside of the watch case is provided, the outside of the watch case can be illuminated so that the light can be seen even in a dark place. When the internal illumination LED is mounted on an integrated circuit mounting circuit board, there is no need to provide a dedicated circuit board, and a further reduction in size and thickness can be achieved. Moreover, if it mounts on a circuit board for exclusive use, the arrangement | positioning freedom degree of LED can be raised.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a longitudinal section of a wrist watch which is a portable timepiece with LED illumination according to the present invention.

  Reference numeral 10 in the figure denotes a watch case including a case 11, a windshield 12 and a back cover 13. In the timepiece case 10, a movement 15 for a portable timepiece with LED illumination is accommodated by positioning with an inner frame 14. The movement 15 includes a metal base plate 16, and a dial 18 is attached to the windshield 12 side of the base plate 16 via an LED-mounted circuit board 17. Outside the dial 18, hands 20 such as an hour hand, a minute hand, and a second hand are provided in a space between the windshield 12. On the other hand, an integrated circuit mounting circuit board 22 is attached to the back cover 13 side of the base plate 16. The integrated circuit mounting circuit board 22 is electrically connected to the LED mounting circuit board 17 via a contact spring 23 that penetrates the movement 15.

  FIG. 2 shows a portable watch movement 15 with LED illumination. (A) shows a plane viewed from the windshield 12 side by removing the outside from the LED-mounted circuit board 17, (B) shows the right side, and (C) shows the back.

  In the figure, 24 is a winding stem provided so as to protrude from the movement 15, 25 is a coin-type battery, 26 is a drive coil, 27 is a timepiece motor, and 28 is a rotation transmission wheel train. In this invention, the movement 15 can be made small and thin, the diameter D in the 12 o'clock to 6 o'clock direction is φ18.10 mm, the diameter W in the 3 o'clock to 9 o'clock direction is 15.3 mm, and the thickness t is 3.15 mm. It is.

3A shows the winding stem 24, and FIG. 3B shows the engagement of the winding stem presser 30 thereto.
As shown in the figure, the winding stem 24 includes a first part a for operating the switch composed of a wide circumferential groove, a second part b for positioning composed of a plurality of narrow circumferential grooves, and a time formed by a gear. A third portion c for correction is provided. The tip of the winding stem presser 30 is engaged with the second portion b.

  FIG. 4 shows a state in which the winding stem 24 is assembled to the movement 15. (A) shows a part of the back, and (B) shows the side.

  The winding stem 24 is inserted into the main plate 16 from the 3 o'clock position to the 9 o'clock position so that it can be inserted and removed in the axial direction. As described above, the tip of the winding stem presser 30 is inserted into the second part b to prevent it from coming off, and the LED lighting switch spring 31 is engaged with the first part a. The LED lighting switch spring 31 is provided with a switch contact portion 33 facing the switch contact portion 32 of the integrated circuit mounting circuit board 22 described above. In the figure, reference numeral 34 is a small wheel having crown teeth 35, and 36 is a reset lever.

  Then, when an LED lighting operation for pushing the winding stem 24 from the normal state shown in the figure by pushing a crown (not shown) attached to the leading end of the winding stem 24 is performed, the leading end of the winding stem presser 30 slides on the slope of the second part b, and the winding stem 24 moves toward the center of the base plate 16, deflects the LED lighting switch spring 31 to contact the switch contact portion 33 with the switch contact portion 32 of the integrated circuit board 22, thereby turning on the switch. The LED 44 described later is turned on.

  On the other hand, when the winding stem 24 is pulled out from the illustrated normal state with a crown (not shown), the leading end of the winding stem presser 30 gets over the slope of the winding stem 24 and engages with an adjacent circumferential groove, and the third portion c The gear is engaged with the crown teeth 35 of the small iron wheel 34, and the time setting operation can be performed by rotating the winding stem 24 around the axis with the crown.

FIG. 5 shows the surface of the integrated circuit mounting circuit board 22 as viewed from the back cover side.
As shown in the figure, on the integrated circuit mounting circuit board 22, a crystal resonator 37, a crystal oscillation capacitor C1, a charger pump capacitor C2, and an integrated circuit (IC) 38 are mounted. Since it is only necessary to increase the charge pump capacitor C2 as compared with an analog-only circuit board, the size can be reduced. Reference numeral 32 in the figure denotes a switch contact portion where the switch contact portion 33 of the LED lighting switch spring 31 contacts or leaves. In the figure, reference numeral 40 is an output terminal for the timepiece motor 27, and 41 is a reset terminal. One end of the contact spring 23 described above is pressed against the back surface of the integrated circuit mounting circuit board 22.

6A shows the surface of the LED-mounted circuit board 17 viewed from the windshield 12 side, and FIG. 6B shows the back surface.
The LED-mounted circuit board 17 has an oval shape as shown in the figure, and both ends in the longitudinal direction on the 12 o'clock to 6 o'clock side are formed to have a diameter of 26 mm. Is installed. An LED connection pattern 45 is formed on the back surface, and the other end of the contact spring 23 described above is pressed against the position 46.

  FIG. 7 shows a circuit configuration of the movement 15 for a portable timepiece with LED illumination according to the present invention. FIG. 8 shows the configuration of the charger pump circuit. FIG. 9A shows an LED lighting timing chart, and FIG. 9B shows a characteristic table as an example of forward current / forward voltage characteristics in a white LED.

  In the illustrated example, the integrated circuit 38 integrally has a boosting function for boosting by a charger pump circuit that does not have a voltage stabilizing circuit, and a clocking function for driving a timepiece. The charger pump circuit shown in FIG. 8 does not have a voltage stabilization circuit, so that when the input voltage decreases, the output voltage also decreases, so that no extra load is applied to the battery 25.

  The voltage is supplied to the charger pump capacitor C2 in response to the oscillation (switching) frequency of the charger pump. Subsequently, the energy charged in the charger pump capacitor C2 is supplied to the terminal of the LED 44 by the output of the charger pump. At this time, the terminal voltage of the LED 44 changes as shown in FIG. 9A due to the balance between the capacity of the charger pump capacitor C2 and the current flowing through the LED 44.

  As shown in FIG. 9B, in order to pass a current of 3 mA to 4 mA between the terminals of the LED 44 using a 1.5V silver battery as the battery 25, the charger pump capacitor C2 may be set to 1 μF. The luminous intensity was about 30 mcd with good results. Furthermore, the consumption current of the silver battery at this time was 8 mA with respect to the maximum current of 10 mA in current characteristics, and a result with no problem as the current characteristics of the silver battery was obtained.

  Thus, in the example shown in the figure, boosting is performed by a charger pump circuit that does not have a voltage stabilization circuit, so that the current consumption of the LED 44 decreases with the deterioration of the battery 25, and thus is limited to conventional 3V batteries. As the LED drive power source, it is possible to use a 1.5V battery with inferior battery capacity, and the movement 25 for the LED-illuminated portable watch and the LED-illuminated cell-phone that can be reduced in size and thickness by reducing the size of the battery 25. A clock can be provided. In addition, it is possible to simplify the circuit configuration and eliminate the risk of increasing the IC cost and increasing the IC size. In addition, in this example, since the boosting function and the timekeeping function are integrally provided in one integrated circuit 38, the IC space can be reduced and further miniaturization can be achieved.

  Further, since the winding stem 24 performs the LED lighting operation together with the time setting operation, there is no need to provide a push button switch for performing the LED lighting operation separately from the winding stem 24 for performing the time setting operation. The size can be reduced and the design can be improved. Particularly effective for women.

  In the example described above, the LED-mounted circuit board 17 is provided on the windshield 12 side of the movement 15, and the LED 44 is mounted on the LED-mounted circuit board 17. Then, for example, in the dark place, by turning on the winding stem 24, the internal illumination LED 44 is turned on, and the light emitted from the LED 44 is reflected by the parting portion 48 of the case 11 as shown in FIG. Is applied to the time display part on the dial 18 so that the time can be easily confirmed. However, with such a configuration, the light is attenuated because it is reflected by the body 11, and in particular when a plastic case is used, a sufficient amount of light cannot be applied to the time display unit.

In FIG. 10, the other example of the attachment method of LED44 to the LED mounting circuit board 17 is shown.
In this example, the internal illumination LED 44 is attached to the LED-mounted circuit board 17 so that the LED 44 is vertical and the solder 49 is used so that the light emission direction of the LED 44 is the plane direction of the dial 18. In this way, the inside of the watch case 10 can be directly illuminated, and the inside of the watch case 10 can be illuminated more brightly without attenuation of light.

  In the above example, the integrated circuit mounting circuit board 22 on which the integrated circuit 38 is mounted is provided on the back cover 13 side of the movement 15, while the LED mounting circuit board 17 on which the internal illumination LED 44 is mounted is provided on the dial 18 of the movement 15. The integrated circuit mounting circuit board 22 and the LED mounting circuit board 17 are electrically connected to each other by using a contact spring 23 that penetrates the movement 15. As described above, when the LEDs 44 are mounted on the dedicated LED mounting circuit board 17, the degree of freedom in arrangement of the LEDs 44 can be increased.

  FIG. 11 shows an example in which the LED 44 is mounted on the integrated circuit mounting circuit board 22. FIG. 12A shows a plane when the movement 15 is viewed from the windshield 12 side, and FIG. 12B shows a back surface when viewed from the back cover 13 side. FIG. 13 shows the surface of the integrated circuit mounting circuit board 22 viewed from the back cover 13 side.

  As shown in FIG. 13, the protrusion 50 is formed on the integrated circuit mounting circuit board 22, and the LED 44 is attached to the attachment position at the tip of the protrusion 50. Then, as shown in FIGS. 12A and 12B, the protruding portion 50 protrudes from the movement 15 and is assembled to the movement 15 so that the LED 44 faces the dial side 18. Similarly, as shown in FIG. 11, the light emitted from the LED 44 is reflected by the parting part 48 of the case 11 to irradiate the inside of the watch case 10 and illuminate the time display part on the dial 18. As described above, when the internal illumination LED 44 is mounted on the integrated circuit mounting circuit board 22, it is not necessary to provide a dedicated circuit board, and a further reduction in size and thickness can be achieved.

  In the above-described example, the case where the LED is the internal illumination LED 44 that illuminates the inside of the watch case 10 has been described. However, the LED is not limited to the internal illumination but may be an external illumination that illuminates the outside of the watch case 10.

FIG. 14 shows a wristwatch that uses the external illumination LED 52 together with the internal illumination LED 44 as the LED.
The internal illumination LEDs 44 and the external illumination LEDs 52 are mounted on the same circuit board 53, three by three at regular intervals of 120 degrees in the circumferential direction. For example, blue light emitted from the internal illumination LED 44 is reflected by the parting part 48 of the case 11 through the three notches 54 on the outer periphery of the dial 18 to illuminate the inside of the watch case 10. For example, orange light emitted from the external illumination LED 52 passes through the windshield 12 through the round hole 55 of the dial 18 and illuminates the outside of the watch case 10.

  Thereby, even in a dark place, the time display unit can be illuminated by illuminating the inside of the watch case 10 and the time can be easily confirmed. Further, the keyhole or the like can be seen by illuminating the outside of the watch case 10 and applying light even in a dark place.

It is a longitudinal cross-sectional view of the wristwatch which is a portable timepiece with LED illumination by this invention. The movement for a portable watch with LED illumination stored in the wristwatch is shown, (A) is a plan view showing the outside from the LED-mounted circuit board and viewed from the windshield side, (B) is a right side view thereof, (C ) Is a rear view. (A) shows the winding stem used in the movement, and (B) shows the engagement of the winding stem presser to the winding stem. The state which assembled | attached the winding stem to the movement is shown, (A) is a partial rear view, (B) is a side view. It is the surface view which looked at the integrated circuit mounting circuit board assembled | attached to the movement from the back cover side. (A) is the surface view which looked at the LED mounting circuit board from the windshield side, (B) is a back view. It is an electric circuit block diagram of the movement for portable timepieces with LED illumination by this invention. It is the charger pump circuit block diagram. (A) is an LED lighting timing chart, and (B) is a characteristic table showing an example of forward current / forward voltage characteristics in a white LED. It is sectional drawing of the wristwatch which differs in the attachment method of LED to a LED mounting circuit board. It is sectional drawing of the wristwatch which mounted LED on the circuit board mounted with an integrated circuit. (A) is the top view which looked at the movement accommodated in the wristwatch from the windshield side, (B) is the back view seen from the back cover side. It is a surface view of the circuit board mounted with an integrated circuit to be assembled to the movement. It is explanatory sectional drawing and the dial plan view of a wristwatch which uses LED for external illumination with LED for internal illumination as LED. It is a charger pump circuit block diagram with the conventional voltage stabilization circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Watch case 11 Case 12 Windshield 13 Back cover 15 Movement 17 LED mounting circuit board 18 Dial 20 Needle 22 Integrated circuit mounting circuit board 23 Contact spring 24 Winding stem 38 Integrated circuit 44 LED for internal illumination
52 LED for external illumination

Claims (8)

  A movement for an LED-illuminated portable timepiece having a boosting function of boosting by a charger pump circuit having no voltage stabilization circuit.   The movement for a portable timepiece with LED lighting according to claim 1, further comprising an integrated circuit integrally having the boosting function and a timekeeping function for driving the timepiece.   A portable timepiece with LED illumination, comprising the movement for portable timepiece with LED illumination according to claim 1 or 2.   The movement for a portable timepiece with LED illumination according to claim 3, further comprising a winding stem that performs at least an LED lighting operation together with a time adjustment operation.   The portable timepiece with LED illumination according to claim 3 or 4, further comprising an LED for internal illumination that illuminates the inside of the watch case.   The portable timepiece with LED illumination according to claim 5, wherein the LED for internal illumination is mounted on an integrated circuit mounting circuit board which is provided on the back cover side of the movement and mounts the integrated circuit.   An integrated circuit mounting circuit board for mounting the integrated circuit is provided on the back cover side of the movement, while an LED mounting circuit board for mounting the internal illumination LED is provided on the dial side of the movement, and the integrated circuit mounting circuit board is provided. The LED-illuminated portable timepiece according to claim 5, wherein the LED-mounted circuit board is electrically connected to each other through a contact spring that penetrates the movement.   The portable timepiece with LED illumination according to claim 3 or 4, further comprising an external illumination LED for illuminating the outside of the watch case.

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