JP2007155595A - Portable timepiece with led lighting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable timepiece with LED lighting having few restrictions in layout and no restrictions in design. <P>SOLUTION: The portable timepiece with LED lighting is provided with a contact spring 23 passed through a movement 15. The contact spring 23 electrically connects an integrated-circuit-mounting circuit board 22, which is provided for the side of a back lid 13 of the movement and mounted with an integrated circuit, to a LED-mounting circuit board 17, which is provided for the side of a dial 18 of the movement and mounted with LEDs 44. The portable timepiece with LED lighting is provided as the LEDs with LEDs for internal lighting for lighting up the inside of a timepiece case and LEDs for external lighting for lighting up the outside of the timepiece. In the portable timepiece with LED lighting provided as the LEDs with the LEDs for internal lighting, light of the LEDs for internal lighting may be reflected at a skirting part 48 of the timepiece case 10 to light up the inside of the time piece case, and the LEDs for internal lighting may be mounted on the LED-mounting circuit board in such a way that the direction of light emission of the LEDs for internal lighting may be turned in the direction of a plane of the dial. <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).

  Conventionally, in this type of portable timepiece with LED illumination, for example, as shown in FIG. 11, an internal illumination LED 4 and an external illumination LED 5 are directly mounted on an integrated circuit mounting circuit board 3 of a movement 2 provided in a watch case 1. It was. The LED for internal illumination 4 and the LED for external illumination 5 are mounted on the integrated circuit mounting circuit board 3 together, for example, three at a regular interval of 120 degrees in the circumferential direction. Then, the light emitted from the internal illumination LED 4 is reflected by the parting portion 7a of the case 7 through the three notches 6a on the outer periphery of the dial 6 to illuminate the inside of the watch case 1, and is emitted from the external illumination LED 5. The light passes through the windshield 8 through the round holes 6b of the dial 6 and illuminates the outside of the watch case 1.

  Thereby, by turning on the internal illumination LED 4, even in a dark place, illuminate the inside of the watch case 1, illuminate the time display unit, easily check the time, and turn on the external illumination LED 5, Even in dark places, the outside of the watch case 1 was illuminated and illuminated so that the keyholes were visible.

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

  However, in the above-described conventional portable timepiece with LED lighting, since the internal illumination LED 4 and the external illumination LED 5 are directly mounted on the integrated circuit mounting circuit board 3, an integrated circuit, a capacitor, and the like are mounted, and various output terminals, etc. The positions of the LEDs 4 and 5 cannot be freely selected on the integrated circuit mounting circuit board 3 having the above.

  Accordingly, an object of the present invention is to provide an LED-illuminated portable timepiece that has few design restrictions and is not subject to design restrictions.

  In order to achieve such an object, the present invention provides an integrated circuit mounting circuit board for mounting an integrated circuit provided on the back cover side of the movement and an LED mounted on the dial side of the movement in a portable timepiece with LED illumination. A contact spring for electrically connecting the LED-mounted circuit board is provided through the movement.

  As the LED, an internal illumination LED that illuminates the inside of the watch case and an external illumination LED that illuminates the outside of the watch case can be provided.

  When the internal illumination LED is provided as an LED, the internal illumination LED is reflected at the part of the watch case to illuminate the interior of the watch case, or the light emission direction of the internal illumination LED is the plane direction of the dial. The LED for internal illumination may be attached to the LED-mounted circuit board so as to be suitable.

  According to this invention, since the LED is mounted not on the integrated circuit mounted circuit board but on the dedicated LED mounted circuit board, the position of the LED can be selected relatively freely, and the design can be improved. it can.

  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.

  In addition, when the interior of the watch case is reflected by reflecting the light from the LED for internal illumination at the part of the watch case, it is easy to check the time while hiding the notches on the dial and the LEDs etc. It can be.

  In addition, when the internal illumination LED is mounted on the LED-mounted circuit board so that the light emission direction of the internal illumination LED is in the plane direction of the dial, the internal illumination LED directly irradiates the inside of the watch case, so that light attenuation The watch case can be illuminated more brightly.

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 example, 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 one circumferential groove of 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 one circumferential groove of 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 is performed to push 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, 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, which are 12 o'clock and 6 o'clock sides, are formed with 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 a dark place, by turning on the winding stem 24, the internal lighting 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 portion 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.

  As described above, 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 side of the movement 15. The integrated circuit mounting circuit board 22 and the LED mounting circuit board 17 were electrically connected by using a contact spring 23 penetrating 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.

  By the way, in the example of illustration mentioned above, the case where the LED 44 for internal illumination which illuminates the inside of the watch case 10 was used as LED was demonstrated. However, instead of the internal illumination LED, for example, an LED such as an external illumination LED 5 that illuminates the outside of the watch case 1 in FIG. 11 is provided as the LED, and such an external illumination LED is provided on the dial side of the movement. A contact spring which is mounted on a dedicated LED-mounted circuit board 17 to be provided and has an LED-mounted circuit board 17 and an integrated circuit-mounted circuit board which is provided on the back cover side of the movement and mounts an integrated circuit, penetrating the movement. You may make it connect electrically.

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 explanatory drawing sectional drawing and the dial plan view of the conventional wristwatch which uses LED for external illumination with LED for internal illumination as LED.

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 Hand 22 Integrated circuit mounting circuit board 23 Contact spring 38 Integrated circuit 44 LED for internal illumination
48 Parting out

Claims (5)

  A contact spring that electrically connects the integrated circuit mounting circuit board, which is mounted on the movement back cover and mounts the integrated circuit, and the LED mounting circuit board, which is mounted on the dial side of the movement and mounts the LED, penetrates the movement. A portable timepiece with LED illumination, comprising:   The portable timepiece with LED illumination according to claim 1, further comprising an LED for internal illumination that illuminates the inside of the watch case as the LED.   3. The portable timepiece with LED illumination according to claim 2, wherein the interior of the watch case is illuminated by reflecting light from the internal illumination LED at a parting portion of the watch case. 4.   The portable timepiece with LED illumination according to claim 2, wherein the LED for internal illumination is attached to the LED-mounted circuit board so that a light emission direction of the LED for internal illumination is directed in a plane direction of the dial. . The portable timepiece with LED illumination according to claim 2, wherein the LED includes an external illumination LED that illuminates the outside of the watch case.

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