MULTI ALARM TIMEPIECE

Abstract: In an analog type timepiece (l00), no electronic display is provided, and a plurality of alarm times are presettable. These preset alarm times can be easily recognized by using a simple hand (P4). A reference signal oscillator (l), wave shapers (4, 6, l2), stepping motors (5a, 7a, l3a), counters (l6, l7), coincidence detector (25) and a buzzer (27) are provided in the timepiece (l00), thereby sequentially quick-shifting the hand mechanism (Pl, P2) to the predetermined alarm time positions.

Description: The present invention relates to a multi alarm timepiece for indicating times with hands and having a multi alarm function for producing an alarm sound when the hands have reached each of the preset alarm times. In one conventional analog alarm timepiece, an auxiliary hand is provided coaxially with the usual hour and minute hands and an alarm time is set mechanically by the auxiliary hand. Such an analog alarm timepiece is known from, for instance, U.S. patent No. 3,775,967. In another conventional timepiece other than those using auxiliary hands, an alarm time is electronically set and an alarm sound is produced when hands have reached the preset alarm time. More particularly, a timepiece of the latter type includes hour and minute hands, an electronic time counter for counting a time identical to one indicated by the hour and minute hands, an alarm time memory circuit for electronically storing an alarm time, and a display unit for optically dis­ playing the time of the time counter and the alarm time of the alarm time memory circuit, an alarm sound being produced when the time of the time counter coin­ cides with the alarm time of the alarm time memory circuit. The above-described timepiece is disclosed in U.S. Patent No. 4,l96,583. In the former analog alarm timepiece having the auxiliary hand, since an alarm time is set mechanically, higher precision cannot be expected and a setting time error may be caused. In addition, such an alarm time­ piece employs complex mechanical structures, resulting in mechanical troubles. In the latter analog alarm timepiece having the electronic time counter and the alarm time memory cir­ cuit, a display unit for displaying the content of the time counter is required in order to match the content of the electronic time counter with the time indicated by the hands. Moreover, both the present time and an alarm time must be set, resulting in a cumbersome operation. In addition, since the latter timepiece has a dis­ play unit, the size of the timepiece is necessarily in­ creased and has a poor outer appearance from the view­ point of design. The present invention has been made in view of the above situation and has as its object to provide such an analog multi alarm timepiece that no optical display unit is provided, a plurality of alarm times can be correctly preset, and a detection can be quite easily made when the preset alarm time has been reached. To achieve the above object and other features, according to the present invention, the multi alarm timepiece comprises oscillating means for generating a reference signal, frequency dividing means for fre­ quency-dividing the reference signal of the oscillating means to produce a predetermined time period signal, stepping motor means driven by the predetermined time period signal derived from said frequency dividing means, and a hand mechanism, constituted of at least an hour hand and a minute hand, and driven by said stepping motor to indicate a time, characterized by further comprising alarm setting switch means for setting an alarm time, time difference memory means for storing first time dif­ ference data between a time indicated by said hand mechanism and an alarm time, and second time difference data from the alarm time to a succeeding alarm time, by operating said alarm setting switch means, alarm time data memory means for storing third time difference data between a present time indicated by said hand mechanism and the succeeding alarm time, detecting means for de­ tecting that said hand mechanism is driven in response to the predetermined time period signal by an amount corresponding to the third time difference data stored in said alarm time data memory means, alarm sound produc­ ing means for producing an alarm sound in response to a detection signal from said detecting means, and supply means for supplying to said alarm time data memory means the second time difference signal stored in said time difference memory means the alarm time and the next alarm time in response to the detection signal from said detecting means. With the above arrangement, although the multi alarm timepiece of the present invention is of analog type, a plurality of alarm times can be precisely set, simple and quick setting operation can be realized and the preset alarm times are quite easily detectable. Further features of the invention will become ap­ parent from the following description of a preferred embodiment of the invention, taken in conjunction with the accompanying drawings. Fig. l shows an outer appearance of a multi alarm timepiece according to the present invention; Fig. 2 is a schematic circuit diagram of the multi alarm timepiece shown in Fig. l; Figs. 3A to 3C are illustrations showing display states and the contents of counters when alarm times are preset, respectively; and Figs. 3D and 3E show alarm time display modes, respectively. MULTI ALARM TIMEPIECE Fig. l shows an outer appearance of a multi alarm timepiece according to an embodiment of the present invention. Referring to Fig. l, in addition to a hour hand Pl, a minute hand P2, and a second hand P3 each for indicating a present time, alarm time hands P4 for indicating the hour and minute of an alarm time are provided. Switches SWl to SW3 for moving hands P4 so as to set an alarm time are also provided. Crown SR is used to initialize hands Pl, P2, and P3. CIRCUIT ARRANGEMENT OF TIMEPIECE Fig. 2 shows an internal circuit diagram of analog alarm timepiece l00 according to this embodiment. Referring to Fig. 2, a clock pulse having a high frequ­ ency is produced from oscillator l. This clock pulse is frequency-divided by frequency divider 2 into a second signal Sl of a l-second period, and is then con­ verted by a scale-of-60-circuit 3 into a minute signal S2 of a l-minute period. The minute signal S2 output by a scale-of-60-circuit 3 is supplied to stepping motor driver 5 through wave shaper 4 to rotate hands P2 and Pl by driving stepping motor 5a. The second signal Sl output from frequency divider 2 is supplied to stepping motor driver 7 through wave shaper 6 so as to drive stepping motor 7a, thereby rotating hand P3 in the same manner as described above. In this manner, the present time can be indicated by hands Pl, P2, and P3. Switches SWl to SW3 shown in Fig. 2 are identical to those shown in Fig. l. A signal from switch SWl is input to flip-flop 8. Set output Q of flip-flop 8 is input to AND gates 9 and l0. AND gate 9 also receives quick-shift signal S3 constituted of 32 pulses/ second from switch SW2. AND gate l0 also receives a signal from switch SW3 and signal S3. When switch SW2 is turned on while flip-flop 8 is set, signal S3 is output from AND gate 9. Signal S3 drives stepping motor l3a through OR gate ll, wave shaper l2, and stepping motor driver l3, so as to quick-rotate hands P4 at 32 Hz. Signal S3 from AND gate 9 is also input to the reset terminals of counter l6 and alarm time data memory counter l7 through OR gates l4 and l5, respectively. The former counter l6 counts shift amounts occurring in the hand mechanism. The latter counter l7 counts data related to an alarm time, i.e., time difference between the present time and the alarm time, and stores the resultant count data. These counters l6 and l7 are arranged by a scale of 720 counter (60 times l2 being 720) for indicating l2 hours. Counter l6 receives signal S2 output from circuit 3 and counts its pulses. When switch SW2 is switched from ON to OFF, counter l6 begins to count the pulses of signal S2. When switch SW3 is turned on while flip-flop 8 is set, quick-shift signal S3 is output from AND gate l0. While switch SW3 is operated, AND gate l0a receives set output Q from flip-flop 8 and also an operation signal from switch SW3, and then outputs this operation signal from switch SW3. Signal S3 from gate l0 rotates hands P4 through OR gate ll and other relevant circuit elements in the same manner as described above. Signal S3 is also supplied to counter l7 to be counted therein. When operation of switch SW3 is stopped, the falling edge of the signal from gate l0a is detected by falling edge detector l8, and detection signal S4 is supplied to RAM controller l9. Upon receipt of signal S4, control­ ler l9 writes the number of pulses counted by counter l7 in RAM 20 as time difference data. Time difference data is written every time signal S4 is input to controller l9. It should be noted that signal S4 is also input to the reset terminal of counter l7 through delay circuit 2l and OR gate l5 after the data is written in RAM 20. As a result, counter l7 starts new data counting every time the time difference data is written in RAM 20 in response to ON/OFF of switch SW3. Signal ℓ from reset output of flip-flop is input to rising edge detector 22. When switch SWl is depress­ ed while flip-flop 8 is set, output is changed from L (low) to H (high) level and its rising edge is detect­ ed by detector 22. Detection signal S5 from detector 22 is supplied to arithmetic calculator 23 and RAM con­ troller l9. Upon receipt of signal S5, controller l9 supplies first time difference data written in RAM 20 to counter l7 and, at the same time, supplies all time data written in RAM 20 to calculator 23. Calculator 23 performs arithmetic operation of "l2 (hours) minus sum of all time difference data plus first time difference data". The calculation result is supplied to pulse generator 24. Pulse generator 24 also receives signal S3 from frequency divider 2 and then outputs pulses corresponding to the calculation result at a rate of 32 pulses/second. The pulses output from generator 24 are input to OR gate ll, and the hands of the alarm time hands are rotated through wave shaper l2, driver l3, and motor l3a, by an angular interval corresponding to the number of output pulses. Output signal ℓ from output of flip-flop 8 is also input to coincidence circuit 25. When the level of output of flip-flop 8 is changed to H level, cir­ cuit 25 detects a coincidence between data of counter l6 and data of counter l7. In this case, counter l6 has counted the minute signals S2 generated after turning off switch SW2, whereas counter l7 stores the first time difference data supplied from RAM 20. When a coin­ cidence is established between these data, coincidence circuit 25 outputs coincidence signal S6. This coin­ cidence signal S6 is input to buzzer driver 26, and buzzer 27 produces an alarm sound. Signal S6 also resets counter l6 through OR gate l4 and, at the same time, is supplied to controller l9. Counter l6 newly starts counting in response to signal S6. Upon receipt of coincidence signal S6, controller l9 supplies the second time difference written in RAM 20 to counter l7 and to pulse generator 24. Generator 24 outputs pulses corresponding to the time difference data. Therefore, in the same manner as described above, alarm time hands P4 are rotated for an angular interval corresponding to the number of pulses supplied from generator 24. Circuit 25 continues coincidence detection. When the next coincidence signal S6 is input to controller l9, controller l9 supplies third time difference data written in RAM 20 to generator 24 and counter l7, in the same manner as described above. In this way, every time coincidence signal S6 is output, a plurality of time difference data written in RAM 20 is supplied to counter l7 and generator 24. Alarm time hands P4 are rotated through an angular interval corresponding to the time difference supplied from generator 24. At the same time, circuit 25 restarts a coincidence detection. ALARM OPERATIONS Figs. 3A to 3E show displays of alarm time setting and alarm operations which are performed by operating switches SWl, SW2, and SW3. Assume that an alarm time is set at, e.g., ll:30 and 3:00. The upper blocks of Figs. 3A to 3E indicate time data of counter l6, re­ spectively, and the lower blocks thereof indicate time difference data of counter l7, respectively. In Fig. 2, suppose that switch SWl is turned on to set flip-flop 8, and thereafter switch SW2 is turned on. Upon this operation, signal S3 from frequency divi­ der 2 is supplied to stepping motor driver l3 through AND gate 9, OR gate ll, and wave shaper l2, and hands P4 start their quick-shift rotation. When hands P4 reach the present time, i.e., l0:l5, switch SW2 is turned off to stop hands P4. Counters l6 and l7 are reset while switch SW2 is ON. Therefore, at this time, neither counter l6 nor l7 stores data. After switch SW2 is turned off, switch SW3 is turned on. Upon this operation, signal S3 is output from AND gate l0, and hands P4 are rotated for quick feed in the same manner as described above. As shown in Fig. 3B, when hands P4 reach a desired alarm time, i.e., ll:30, switch SW3 is turned off to stop hands P4. At this time, counter l7 stores time difference data corresponding to the quick-shift amount of hands P4. More particularly, since hands P4 are fed quickly from the present time (l0:l5) to the alarm time (ll:30), time difference data (l:l5) is stored in counter l7. This time difference data is written in RAM 20 by signal S4 of detector l8 which detects a falling edge of an output from AND gate l0a, and counter l7 is reset immediately thereafter. It should be noted that since one minute suffices to allow the alarm time to be set, no time data is stored yet in counter l6 at this time. Subsequently, assume that a next alarm time is to be set at 3:00. In this case, switch SW3 is similarly depressed to feed hands P4 quickly to 3:00. In this condition, counter l7 stores time difference data, i.e., 3:30, obtained by subtracting the next alarm time (3:00) from the first alarm time (ll:30), as shown in Fig. 3C. This time difference data is written in RAM 20 succes­ sively after the first time difference, and counter l7 is reset immediately thereafter. Meanwhile, counter l6 counts an elapsed time (e.g., l minute, as shown in Fig. 3C) since switch SW2 was turned off. When third, fourth,... alarm times are to be et, switch SW3 is repeatedly depressed in the same manner as described above, so that third, fourth,... time dif­ ference data are sequentially written in RAM 20. After all the desired alarm times are set, switch SWl is depressed to reset flip-flop 8. Upon this operation, all the time difference data written in RAM are supplied to arithmetic calculator 23, and the arithmetic operation of "l2 (hours) minus sum of all time difference data plus first time difference data" is performed in order to quick-feed hands P4 to the positions of the first alarm time. In the example shown in Figs. 3A to 3C, "l2:00 - (l:l5 + 3:30) + l:l5" is calculated and 8:30 is obtained. Pulse generator 24 outputs signals S3 corresponding to this operation result. Therefore, alarm time hands P4 are fed quickly for an amount corresponding to 8:30 from the last alarm time (3:00) and are stopped at the first alarm time, i.e., ll:30, as shown in Fig. 3D. As a result, the first alarm time is clearly indicated. Meanwhile, the first time difference data (l:l5) written in RAM 20 is supplied to counter l7 in response to turning switch SWl off. Counter l6 continues to count the elapsed time (5 minutes). With the above operations of switches SWl to SW3, presetting all the alarm times is completed. Under this state, after the last turning off switch SW3, coin­ cidence circuit 25 detects coincidence between the time data of counter l6 and the time difference data of cou­ nter l7. When the present time reaches (ll:30), counter l6 counts (l:l5), which coincides with the time differ­ ence data (l:l5) of counter l7. Then, buzzer 27 produces an alarm sound. In synchronism with the alarming, next time differ­ ence data (3:30) is supplied to counter l7 and pulse generator 24 from RAM 20, and hands P4 are fed quickly for an amount corresponding to the time difference. More particularly, hands P4 are fed quickly from the first alarm time (ll:30) for an amount corresponding to 3:30, as shown in Fig. 3E, and are stopped at the next alarm time (3:00). As a result, the next alarm time is clearly indicated. Meanwhile, counter l6 is reset in synchronism with the coincidence detection by cir­ cuit 25, and starts counting again thereafter. When the elapsed time coincides with the time difference data (3:30) of counter l7, an alarm sound is produced and the same process as described above is performed. In this manner, when a plurality of alarm times are to be set, this operation is performed repeatedly. In the above embodiment, the alarm time hands con­ sist of an hour hand and a minute hand. However, only one hand like a conventional auxiliary hand may be pro­ vided. In this case, the hand moves in units of l2 minutes. For example, when the hand points to a posi­ tion corresponding to 5 minutes of an ordinary time­ piece, it indicates (l:00). When the hand points to a position corresponding to 6 minutes of an ordinary timepiece, it indicates (l:l2). Alternatively, the scale can be calibrated in 48 divisions, so that one scale unit corresponds to l5 minutes. Although the alarm time hands are provided at a position different from the present time hands in the above embodiment, they may be provided to be coaxial therewith.

Claims: 1. A multi-alarm timepiece comprising: oscillating means (l) for generating a reference signal; frequency dividing means (2, 3) for frequency­ dividing the reference signal of the oscillating means (l) to produce a predetermined time period signal (Sl, S2); stepping motor means (5a, 7a) driven by the pre­ determined time period signal derived from said fre­ quency dividing means; a hand mechanism (Pl, P2), including at least an hour hand and a minute hand, and driven by said stepping motor to indicate a time; alarm setting switch means (SW2, SW3) for setting an alarm time; time difference memory means (20) for storing first time difference data between a time indicated by said hand mechanism (Pl, P2) and an alarm time, and second time difference data from the alarm time to a succeeding alarm time, by operating said alarm setting switch means (SW2, SW3); alarm time data memory means (l7) for storing third time difference data between a present time indicated by said hand mechanism (Pl, P2) and the succeeding alarm time; detecting means (l6, 25) for detecting that said hand mechanism (Pl, P2) is driven in response to the predetermined time period signal by an amount corre­ sponding to the third time difference data stored in said alarm time data memory means (l7); alarm sound producing means (26, 27) for producing an alarm sound in response to a detection signal (S6) from said detecting means (l6, 25); and supply means (l9) for supplying to said alarm time data memory means (l7) the second time difference signal stored in said time difference memory means (20) in response to the detection signal (S6) from said detecting means (l6, 25). 2. A timepiece as claimed in claim l, charac­ terized in that the timepiece further comprises first alarm hand means (l2, l3, l3a, P4) for indicating the alarm time, and that said alarm setting switch means includes first switching means (SW2) for match­ ing said alarm hand means (l2, l3, l3a, P4) with said hand mechanism (Pl, P2), and second switching means (SW3) for quick-shifting up to a position indi­ cating the alarm time said alarm hand means matched with said hand mechanism by said first switching means (SW2). 3. A timepiece as claimed in claim 2, character­ ized in that said alarm hand means comprises a stepping motor (l3a) other than said stepping motor means for driving said hand mechanism. 4. A timepiece as claimed in claim l, character­ ized in that the timepiece further comprises second alarm hand means for indicating the alarm time, and that the second alarm hand means including first quick-­ shifting means (24) is quickly fed by the second time difference data between the alarm time and the succeed­ ing alarm time in order to indicate the next alarm time, said second time difference data being output from said time difference memory means (20). 5. A timepiece as claimed in claim l, character­ ized in that the timepiece further comprises third alarm hand means for indicating the alarm time, and that second quick-shifting means (l0, ll) for sequentially quick-shifting said third alarm hand means to a plurali­ ty of positions indicating a plurality of alarm times by operating said alarm setting switch means (SWl, SW2). 6. A timepiece as claimed in claim 5, character­ ized by further comprising means (23, 24) for quick-shifting said alarm hand means, which has been quick-shifted to a position indicating the alarm time by one of said first and second quick-shifting means, to a first position of the alarm time. 7. A timepiece as claimed in claim l, character­ ized in that said detecting means includes: shift amount counting means (l6) for counting said predetermined time period signals; and, a coincidence detecting circuit (25) for detect­ ing a coincidence between a counting result of said shift amount counting means and one of said first and second time difference data stored in said alarm time data memory means. 8. A timepiece as claimed in claim l, character­ ized in that said time difference memory means includes a RAM.

Inventors: NAKAZAWA, EIJI PATENT DEP.DEV.DIV. HAMURA
Applicants: CASIO COMPUTER COMPANY LIMITED
Application year: 1986
Main classification: G04C3
IPC codes: G04C23, G04C21, G04G13, G04C3