Second adjustment system in an electronic watch
BACKGROUND OF THE INVENTION 
     This invention relates to an electronic watch, and more particularly to a second indication adjusting system in the electronic watch employing a quartz oscillator or a tuning fork type oscillator as a time base. 
     Conventionally, in such electronic watches, there is not provided a second indication adjusting function. After stopping the operation of a watch, the second indication is adjusted by setting again a second hand to a correct time. Therefore, it is impossible to avoid the inconvenience caused by the adjustment. In particular, the adjustment for a time lag of a second in the second indication is inconvenient, since it is required that the watch operation be stopped during several minutes for more than a minute in spite of only a second delay of the second indication. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of this invention to provide an electronic watch provided with a second adjustment system capable of briefly adjusting incorrect times of only a second delay or advance in a second indication without stopping the operation of the watch. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     For a fuller understanding of the invention, reference is had to the following description taken in connection with the accompanying drawings, in which: 
     FIG. 1 is a circuit block diagram illustrating a second adjustment system of the present invention; 
     FIG. 2 shows waveforms of output pulses corresponding to time signals produced by a divider; 
     FIG. 3 is a connection diagram showing an example of circuit construction of terminals for time signals; 
     FIG. 4 is a plane view showing a detailed construction of a second adjustment switch and terminals in the present invention; and 
     FIG. 5 is a perspective view of the second adjustment switch shown in FIG. 4. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will be fully described by way of the embodiment in connection with the accompanying drawings. 
     FIG. 1 shows a block representation diagram showing a circuit block of a second adjustment system of the present invention. A standard oscillating circuit A, in which a quartz oscillator is used as a time base, changes the oscillation thereof having a relatively high frequency to a signal which is applied to a divider B. The signal applied to the divider is counted down therein, so that time signals of various output pulses: 1 Hz, n Hz and 1/n Hz (n:integer) are produced. For instance, it is assumed that the time signal as mentioned above may be produced in several different combinations such as the following 
     (1) 1 Hz, 2 Hz, 1/2 Hz 
     (2) 1 Hz, 2 Hz, 5 Hz, 1/2 Hz, 1/5 Hz 
     (3) 1 Hz, 2 Hz, 5 Hz, 10 Hz, 1/2 Hz, 1/5 Hz, 1/10 Hz 
     The time signal as mentioned above is converted into a time indication by being applied through a driving circuit C to a converter D. The circuit is powered by the battery E. In normal operation of the watch, a second adjustment switch F is connected to a terminal G for a 1 Hz time signal, so that a second signal is fed to the driving circuit C and the converter D to indicate normal time. Terminal H for a time signal n Hz is provided to advance a second hand while a terminal I for a time signal 1/n Hz is provided to delay the second hand. 
     When adjusting the delay of the second hand, the second adjustment or time signal selection switch F is connected to the terminal H. At this time, provided n Hz is 2 Hz, the time signal of 2 Hz is supplied to the driving circuit C and the converter D so that the speed of the second hand increases to two times the usual speed. While, in order to adjust the advance of the second hand, the connection terminal of the second adjustment switch F is changed to the terminal I. At this time, provided 1/n Hz is 1/2 Hz, the time signal of 1/2 Hz is supplied to the driving circuit C and the converter D, whereby the speed of the second hand is reduced to a half of the usual speed. 
     In this way, after the second hand is advanced by &#34;n&#34; times or &#34;1/n&#34; times the usual speed to set the indicated time to a standard time, the connection terminal of the second adjustment switch F is changed again to the terminal G for the normal time signal. The watch operation again becomes normal where the second hand is driven once per second, so that the second indication of the watch is indicated once per second. 
     FIG. 2 shows waveforms of outputs corresponding to time signals used in the electronic watch according to the present invention. 
     FIG. 3 is a connection diagram showing an example of a circuit construction for time signal terminals in the present invention. A coil 2 is connected to I.C. chip 1 by means of a plurality of terminals. Though 1 Hz output pulse is supplied to the coil 2 in the normal operation of the electronic watch, either one output pulse of n Hz or 1/n Hz is supplied to the coil 2 in accordance with the change of the second adjustment switch to adjust the second indication. 
     FIG. 4 is a plane view showing the detailed construction of the second adjustment switch and terminals employed in the present invention. 
     FIG. 5 is a perspective view of the second adjustment switch shown in FIG. 5. 
     In FIG. 4, the second adjustment switch F comprises a rotary means 3 and a lead means 4. The rotary means 3 is in a circular form having a certain thickness and is provided with a groove 5 at its upper surface. One end of the lead means 4 is inserted into the groove 5 of the rotary means 3 while the other end thereof is connected to a terminal 6 of a driving circuit C. The rotary means 3 is mounted to a switch setting knob or button 7 in such a way that both the rotary and lead means are rotatable as one body when the switch setting knob is rotated. The rotary means is further provided with a stopper 8 for preventing its excessive rotation. The rotation is limited by means of the stopper 8 which is received by a stopper receiver 9. Terminals for time signals comprises lead members 10, 11 and 12 and contact means 13, 14 and 15 which are provided at end portions of said lead members. 
     The lead means 4 is connected to the contact means 13 of the terminal G for the 1 Hz time signal in the normal operation of the watch. When the switch setting knob 7 is rotated into a left direction in FIG. 4 in order to adjust the second indication, the rotary means 3 rotated in the left direction together with the switch setting knob 7 so that the lead means 4 moves in the same direction. The lead means 4 is disconnected from the contact means 13 and in turn touches the contact means 14 to be connected to the terminal H for the n Hz time signal. After the adjustment of the second indication is effected in this way, the switch setting knob 7 is rotated in a right direction, whereby the lead means 4 moves back to a neutral position so that it is connected to the terminal G. 
     When rotating the switch setting knob 7 in the right direction shown in FIG. 4 for adjusting the second indication, the connection of the lead member 4 changes to terminal I for the time signal 1/n Hz in the same way as mentioned above. After the adjustment of the second indication, the switch setting knob 7 is rotated in the left direction, so that the lead means 4 also moves back to the neutral position. 
     As mentioned above, in the electronic watch according to the present invention, the second indication may be precisely adjusted while the watch remains in a continuously operative state by the time signal selected by changing the second adjustment switch for advancing or delaying the second hand, since the time signal for advancing or delaying the second hand is produced from the divider. Further, since the time signal is developed in various combinations of diffrent rates, the second indication may be adjusted to a great extent by only selecting one of a plurality of terminals for the respective time signals. Furthermore, the precise adjustment of the second indication can be effected by a simple operation requiring only a setting of the second adjustment switch.