JPS6235283A - Analog hand stand-by device for analog digital display timepiece - Google Patents

Abstract

PURPOSE:To reset a timepiece to a normal display state in a short period and to make its digital display easy to read by advancing an analog hand fast to a specific stand-by position when the hand overlaps with the digital display part and then advancing it fast to the current time after digital clocking. CONSTITUTION:A reference clock from an oscillator 10 is frequency-divided 12 to obtain a specific clock signal, which is supplied to respective parts as a time signal, a clocking signal, and a synchronizing signal. Further, analog hands 14a and 14b and the display part 24 are provided in a display area and the hands 14a and 14b are rotated by a motor 16 connected to a motor driving circuit 20. Further, the circuit 20 is provided with a correct time counter 22, a hand position detecting circuit 36, a changeover switch circuit 30, a hand resetting circuit 40, a fast advance control circuit 38, a display switching circuit 28, etc. Then, when the hands 14a and 14b overlaps with the display part 24, thereby are advanced fast to the specific stand-by position and then advanced fast to the current time after digital clocking to enter the normal display state in a short time, thereby making the digital display easy to read.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an analog pointer retraction device for an analog/digital display timepiece, in particular, an analog pointer retraction device for an analog/digital display timepiece, in which the analog pointer displays the time, while the digital display section displays the time and functions such as a stopwatch, timer, etc. This invention relates to an improved analog pointer retracting device for retracting the analog pointer from the digital display section to make the analog pointer easier to read when the digital timer is displayed in an analog/digital display clock that displays time other than the time. It is.

[Prior Art] Analog-digital display watches that combine an analog display that displays the time based on the rotational position of a hand with a digital display that displays the time itself on a liquid crystal display, etc. are well known, and have been put to practical use as various wristwatches or table clocks. There is.

Japanese Patent Application Laid-Open No. 56-51690 discloses an example of an electronic watch that combines such hands with a digital display, and the user can read the desired time using any display of his/her preference.

However, in this type of analog-digital display watch, in order to make effective use of the display area, the analog pointer overlaps the digital display section, making it difficult to read the digital display section that is usually located at the bottom. Was.

As an improvement of the conventional analog digital display clock, for example, Japanese Patent Application Laid-open No. 55-124089 or No. 58-886
As shown in No. 92 and the like, an apparatus has been proposed that has a plurality of digital display sections and displays the digital display at a position that avoids overlapping with other hands when the two displays overlap.

[Problems to be Solved by the Invention] However, in a device that performs digital display at multiple locations, a plurality of digital display units are needlessly required.
As the equipment became larger, this became a major factor in the price increase.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to:
Focusing on the fact that the overlap between the two becomes a problem when one displays the time and the other performs timekeeping operations necessary for other stopwatch or timer functions, we It is an object of the present invention to provide an improved analog pointer retracting device which retracts the analog pointer to a predetermined position only when each display operation is performed and makes the digital display easy to read.

In practice, when both the analog and digital displays display the same time, this overlap is not so much of a problem; rather, a watch that always places the digital display in a fixed position and reads the time using the analog hand when the two display overlap. This is extremely effective in design and in reducing the size and cost of the device.

When the analog display is actually performed by a hand driven by a motor, even if the two overlap, unlike the conventional device described above, it is possible to read the time with sufficient accuracy using only the analog hand.

However, when operating a stopwatch or timer that is different from the normal time display on such a display watch, such a digital display no longer provides a display that is completely unrelated to the analog display, and furthermore, these special functions When the digital display is in operation, the user focuses only on the time display rather than knowing the time. Considering this type of usage, the digital display is limited only when it is performing display operations other than time display. In practice, it is extremely beneficial to save the analog pointer.

Therefore, the present invention is characterized in that only in such special cases, the analog pointer is temporarily retracted to a predetermined position where it does not overlap with the digital display section, so that the digital display can be preferentially made easier to see.

[Means and operations for solving the problems] In order to achieve the above object, the present invention includes a changeover switch that switches between a time display and a timekeeping display on a digital display section, and the timekeeping is performed by the operation of this changeover switch. During operation, when the analog pointer overlaps the digital display section, it is fast-forwarded to a predetermined retracted position, and when the changeover switch returns from the clock display to the time display, the analog pointer changes to the current time. It is characterized by forwarding the instep until they match.

The overlapping of the image displays is detected by a pointer position detection circuit, and a fast forward signal is supplied to a motor that rotates the analog pointer using a motor drive circuit controlled by a fast forward control circuit. Both hands are retracted by fast forwarding from the overlap to the 40 minute position where they can be retracted, and for the hour hand, for example, to the 8 o'clock position.

The current time will deviate from the pointer position due to the evacuation, but
This current time is memorized by a correct time counter that sequentially counts the displayed time signal, while the position of the finger button is memorized by a provisional time counter that counts the pointer position signal, and the return operation of the changeover switch When time display starts again, the analog hand is fast-forwarded until it catches up with the current time.

Of course, if the timekeeping operation is still continuing even when the contents of the two counters match, the current time display is unnecessary, so hold the analog pointer in the retracted position until the timekeeping operation is complete. It is also possible to keep it.

[Example] Preferred embodiments of the present invention will be described below based on the drawings.

Structure of Embodiment FIG. 1 shows the overall structure of a preferred embodiment of an analog digital display timepiece incorporating an analog m4 saving device according to the present invention.

Oscillator 10, which forms the reference clock source, is typically a crystal oscillator and outputs a highly accurate high frequency reference clock signal.

The reference clock signal is frequency-divided into a predetermined clock signal by a frequency dividing circuit 12, and is supplied to each part of the device as a time signal, a clock signal, or other synchronization signal.

In order to perform analog display, analog hands 14 are provided in the display area of the watch, and in the embodiment, the desired analog display is performed using the hour hand and minute hand.

A motor 16 is provided to rotate the pointer 14;
Usually, it consists of a stepping motor, and the rotation of this motor is transmitted to each of the finger hooks 14 through a reduction gear train 18, and m4 rotation for displaying the desired time and fast forwarding for time correction or retraction of the finger 21, which will be described later, are performed. It will be done.

The motor 16 is controlled by a motor drive circuit 20, and the motor drive circuit 20 can control the drive speed of the motor 16 based on normal feed and rapid feed signals supplied from the frequency dividing circuit 12.

A right time counter 22 is provided in synchronization with the display time signal supplied from the motor drive circuit 20 to the motor 16, and this right time counter 22 is used when the analog hand 14 is displaying the normal time. Store the display time that matches the hand position.

The contents of the hourly time counter 22 are then supplied to a digital display unit 24 including a liquid crystal display element, etc., so that the digital display unit 24 can display a desired time.

In the analog digital display timepiece to which the present invention is applied, both the analog pointer 14 and the digital display section 24 display the time, and the digital display section 24 can perform a timekeeping operation different from the normal time display. In the embodiment, a timekeeping operation as a stopwatch is shown.

That is, the device is provided with a stopwatch counter 26, and either the hourly time counter 22 or the stopwatch counter 26 is selected by a display switching circuit 28 and supplied to the digital display section 24.

Therefore, the digital display section 24 selectively displays the selected time or clock signal, and the display switching circuit 28 switches the display switching circuit 28 using the changeover switch circuit 30.
It is controlled by signals from

Of course, the device is provided with an operation switch 32 in order to perform various operations such as stopping or returning the stopwatch counter 26 to one half.

The changeover switch circuit 30 has a built-in changeover switch, which will be described later, and allows the user to select either the time display or the M hour display as necessary for the digital display section.

In the present invention, it is clear that the above-mentioned hourly time counter 22 matches the display content of the analog hand 14 in the normal display state, but while the analog hand 114 is in the retracting operation, the display content of both becomes inconsistent. It is.

That is, although the hourly time counter 22 has only the current displayed time as its content, the analog pointer 14 is disabled from displaying the current time when it is retracted from the digital display section 24.

In the present invention, a temporary time counter 34 is provided to store and hold the contents of the analog phase opening 14 as is, and this temporary time counter 34 is connected to the analog pointer 14.
Even when the pointer is retracted, the current position of the pointer remains unchanged.

The content of the provisional time counter is detected by the pointer position detection circuit 36. For example, in the embodiment, when the analog pointer 14 is between 20 and 39 minutes for the minute hand and between 4:00 and 7:00 for the hour hand, the analog pointer 14 is detected by the pointer position detection circuit 36. is the digital display section 24
Outputs a signal indicating that the

Therefore, based on such a pointer position detection signal, the motor drive circuit 20 can rapidly advance the pointer to retreat from the digital display section when the analog pointer 14 overlaps the digital display section 24.

In the present invention, the pointer retraction position is predetermined, and when the digital display section 24 is usually provided at the lower center of the dial, the above-mentioned shape can be normally prevented if the pointer 14 advances to the 40 minute position. The position is suitable as a retreat position.

Therefore, when the pointer 14 moves sequentially due to the rapid forwarding,
The hand position at this time is read by the temporary time counter 34, and the hand position detection circuit 36 cuts off the detection signal when the hand 14 moves to a predetermined retracted position, and stops the fast forwarding by the motor drive circuit 20. This fast forward stop is
It is mainly controlled by the fast forward control circuit 38.

A pointer return circuit 4 is operated in conjunction with the changeover switch circuit 30.
0 is provided, and when the timekeeping operation of a stopwatch or the like ends, the pointer return circuit 40 issues a command to return the pointer by operating a changeover switch.

In the present invention, when the return command is issued, the analog pointer 14 is driven to fast forward from the retracted position, and the hourly time counter 22 and temporary time counter 34 match and match when the analog phase opening catches up with the current time. A signal is output from the circuit 42 and the return to normal analog display is completed.

In the embodiment, when the current time passes the retracted position during a timekeeping operation, the analog pointer 14 remains at the retracted position until a pointer return command is issued.

Effects of the Embodiment The embodiment of the present invention has the above configuration, and its effects will be explained below.

FIG. 2A shows the state of the time and clock display in a state where the analog pointer 14 does not overlap the digital display section 24,
The actual appearance of the display screen is shown in FIG.

In FIG. 2A, the signal indicates a display time signal which is supplied from the frequency dividing circuit 12 to the motor drive circuit 20 to drive the motor 16 and is also supplied to the hourly time counter 22. It is used as a signal to move the motor 16 one step at a time and to count up the hourly time counter 22 one at a time. Therefore, the exact time counter 22 indicates the current time itself.

FIG. 3A shows time 1 of FIG. 2A. The current time is 10:10, and in this state, the analog finger t1
14a (hours) and 14b (minutes) do not overlap with the negative display section 24. On the other hand, signal 1] is a pointer position signal that is supplied from the frequency dividing circuit 12 directly or via the motor drive circuit 20 to the temporary time counter 34, and indicates a one-minute cycle signal during normal time display. The signal also matches the content of the analog pointer 14 during evacuation and fast forwarding, which will be described later.

Therefore, near time t1 in FIG. 2A, the display time signal and the pointer position signal H completely match.

FIG. 3B shows a state in which the digital display unit 24 has been switched from displaying the previous time to displaying the time of a stopwatch at the time 10:10, and the display content means 090 seconds. Time t2 in FIG. 2A indicates this switching timing, but at this time, as mentioned above, the analog phase opener 14 does not interact with the digital display section 24, so
The pointer 14 is not retracted, and the display time signal and the pointer position signal H are still the same signal.

11 Ri 1 Emperor 1 Figure 2B shows the pointer 14 (minute hand 14) as shown in Figure 4.
b) shows the finger retracting action when the digital display section is switched to the timekeeping display when the digital display section 24 is in line with the digital display section 24, and in the embodiment, the switching is performed at 9:32.

The figure shows the effect when the digital timekeeping operation period during which the hands are retracted is long and the current time exceeds the retracted position of the hands when returning to the time display. Figure 4 shows the movement of the hands. ing.

At the time of switching (t3) in FIG. 4A, a fast forward signal is supplied from the motor drive circuit 20 to the motor 16, and the pointer 14b rapidly moves to a predetermined position, for example, the 40 minute position. It is also supplied to the provisional time counter 34 as time 1. as shown in FIG. 4B. The hand 14 is rapidly forwarded and the provisional time counter 34 is rapidly counted up.

In FIG. 4B, the digital display section 24 has already been switched to a digital clock display. As is clear from FIG. 848, when this digital time display is displayed, the pointer 14 is in a position completely retracted from the display section 24, and the user can read the display extremely easily without being obstructed by the pointer 14. becomes.

Time t5 indicates the position of 9R40 minutes, and from this time the current time advances beyond the retracted position of the hand 14, but in this embodiment the hand 14 still remains at the retracted position. When the timekeeping operation returns to the time display at time t6, the hand 14 is fast-forwarded at time t6, catches up to the current time at time t7, and then returns to normal hand movement.

FIG. 5 shows another aspect of this embodiment, in which the pointer 14 does not overlap the display section 24 when the digital display is switched from the time display to the timekeeping display, but when the two overlap during the timekeeping operation. Indicates evacuation operation.

From 1oFRio in FIG. 5A, the digital display section 24 switches to a timekeeping display as shown in FIG. 5B. In this state, the pointer 14 does not make any retraction operation, but when the time reaches 10:20 (FIG. 5C) The two overlap, and in this state, the pointer 14 is retracted to the 10:40 position shown in FIG. 5D, as described above. Then, when the display section 24 returns to displaying the time as shown in FIG. 5E, the hands 14 perform a fast forward chasing action until the current time reaches 10:40, and when the two coincide, the hands return to normal movement as described above. As shown in FIG. 5F, the same time is displayed in both analog and digital formats.

As explained above, according to the present invention, when the analog pointer overlaps with the digital display section, a predetermined retreat is performed when the digital display section displays the time, and the digital display section returns to the normal time display. When the watch returns, the analog hand moves quickly to track the current time, and after the two match, the analog hand starts moving normally.

Each individual circuit will be explained below.

Time/clock switching and finger return Figure 6 shows a changeover switch circuit 30 and a pointer return circuit 40.
The changeover switch circuit 30 is provided with a changeover switch 50 to switch the display on the digital display section 24 from the normal time display to the timekeeping display of a stopwatch, and by turning on the changeover switch 50, Flip-flop (referred to as FF) 51 to rQJ
A signal is output, and an inhibit period detection clock A synchronized with the clock φ2 (128 Hz) is output by the Antogame I-52.

The switching signal G, which is the output of the FF 51, is supplied to the AND gate 52, and is also supplied to the F of the pointer return circuit 40.
The return signal B is supplied to the F groups 53, 54, and 55, and the return signal B is output from the AND gate 56 at a time slightly delayed from the return of the changeover switch 50, that is, the OFF operation.

FIG. 7 shows the relationship between the switching signal G, the time detection clock Δ, and the return signal B.

Positive time counter and provisional time counter In FIG. 8, a positive time counter 22, a provisional time counter 34,
An example of the matching circuit 42 is shown. The counters 22 and 34 are respectively decimal counters 57 (60),
Hexadecimal counter 58 (61) and Decimal counter 59
(62) and output the minutes digit, tens digit, and hour signal, respectively. The respective signals are compared in the comparison circuit 63 of the coincidence circuit/12, and when the two match, the one-shot circuit 35 outputs a coincidence signal.

In the present invention, the coincidence signal is used as a signal to cause the analog pointer to fast-forward when the changeover switch returns to time display operation, and to stop fast-forwarding when the pointer display time matches the current time.

Overlap Detection FIG. 9 shows an example of the pointer position l detection circuit 36, and its operation is shown in the timing chart of FIG. 10.

The pointer position detection circuit 36 consists of a minute prohibition zone detection circuit 66 and an hour prohibition zone detection circuit 67, the former being FF68.69.
．． 70. ANDGATE 71. The latter also includes an FF 73, 74, 75, 76, an AND gate 77, and an OR gate 78. Both detection circuits 66
．． The OR gates 72 and 78 of 67 are supplied with the switching signal G inverted by the inverter 80 through the OR gate 79 and the coincidence signal at the time of addition)f), whereby both the detection circuits 66 and 67 display digital When the section 24 is displaying time (when the switching signal G is rHJ), it is always in a reset state, and this reset is canceled when the digital display section 24 returns to displaying time. As shown in FIG. 10, the prohibited section detection circuit 66 cyclically sequentially receives two types of signals "2" and "3" from the combinations of X+', X2-, and X3- (7) due to its logic circuit configuration. Output. Therefore, these signals r2J and r3J are input to the hexadecimal counter 61 of the provisional time counter 34 shown in FIG.
If you compare the outputs X+, X2, and X3, this
×3 indicates the 10th digit of the minute, so it is the temporary time, that is, the finger 21.
When the position of 14 is from 20 minutes to 39 minutes, the comparison circuit 81 compares the X and X- as the 10th digit of the minute, thereby detecting that the phase division It 14 b is in the desired minute prohibited section. be able to.

Similarly, the time prohibition section detection circuit 67 detects the outputs JY+-, Y2-, . . . as shown in FIG. Y3”.

The combination of Y4 - is r4J r5J r6J r
By outputting four types of signals 7J and comparing them with the output Y of the decimal counter 60 of the provisional time counter 34 in the comparator circuit 82, it is possible to detect the hour prohibition period detection signal when the hour hand 14a is between 4 o'clock and 7 o'clock. It can be output.

The above-mentioned both minute and hour prohibited section detection signals are outputted from the OR gate 83 as a prohibited section detection signal E when any of them is output.

The motor drive circuit 20 is mainly shown in FIG.
A drive current is supplied to the stator coil 89 of the stepping motor 16 via the motor 7.88, and the rotor 90 is rotated by the repetition frequency of the pulses at this time.

The pointer position signal 1'' is output as a signal obtained by selectively switching between a display time signal consisting of a normal clock feed or correction feed signal and a 16 Hz fast feed signal from the AND gates 91 and 92 and the OR gate 93.

FF94 is used to switch between the normal display time signal and the fast-forward signal (161-IZ) for evacuation and chasing.
is provided, and when the AND gate 92 is selected by this fast-forward switching signal T, the pointer position signal H is switched to a fast-forward signal for evacuation.

In order to reset the FF 94, the coincidence signal from the coincidence circuit 42 mentioned above is supplied to the reset input of the FF 94, and after the evacuation and chasing of the analog pointer are completed, the FF 94 is reset.
F94 is reset and the switching signal T becomes rLJ.

On the other hand, when the prohibited section detection signal E is outputted from the pointer position detection circuit 36 and at the same time this stitch switching signal G indicates the time display, the FF 94 is set by the set input from the AND gate 98, and the fast forward switching signal T is set. is output, and in response to the pointer position signal H, the motor 16 fast-forwards the pointer 14 to the retracted position or fast-forwards the pointer 14 to the current time, and at U, 1, the temporary clock counter 34 is set to the finger-side position and counted up. do.

Is time t in Figure 7 displayed? X1324 indicates a state in which the timekeeping display has been switched, and as shown in FIG. 4, when the pointer 14 overlaps the display section 24, a prohibited section detection signal E is output, which causes a fast forward switching signal T to be output.
Fast forwarding will start.

The rapid forwarding is stopped when the pointer 14 moves to a predetermined retracted position as shown in FIG. 4B, but the stop control is controlled by F.
This is done by F99. In other words, FF99 is reset]
. . , the AND gates 91 and 92 cut off the power from both hands and stop outputting the pointer position signal T1. Resetting 1 to FF99 is performed by the return signal B shown in FIG.

Further, the FF 99 is set by an AND gate 100, and the inputs of the AND gate 100 are supplied with signals C and Q from a fast forward control circuit 38 as shown below.

An example of the fast-forward control circuit 38 is shown in FIG.
．． 104, 105, FFs 106, 107, and AND gate 108 output a fast forward stop trigger signal C.

The prohibited period detection signal E intermittently resets each of the FFs 103 to 105 at a cycle longer than the prohibited period detecting clock Δ, and when the reset is released, the prohibited period detecting clock A performs the inverting action of the FF group. Therefore, when the prohibited section detection signal E is repeatedly output, the prohibited section detection clock A does not have time to invert the highest IFF stage 105 and is not output, but the pointer 14 moves to a predetermined retracted position and As shown in FIG. 7, when the prohibited section detection signal E becomes rLJ continuously, the prohibited section detection clock A easily inverts the final stage 105, thereby making it possible to output the fast forward stop trigger signal C. However, first. 2nd stage FF103,
104 is an inverter 109. Or game 1-110
Since the fast forward 1-rega signal C is reset by the switching signal G via the digital clock display, such a fast-forward 1-rega signal C is not output for any purpose other than the digital time display.

Therefore, the motor driving circuit 20 is operated to perform fast forwarding by means of the fast forwarding stop trigger signal C of the fast forwarding control circuit 38.
It is understood that the fast forwarding stops when the timer reaches a predetermined retreat position, for example, the 40 minute position.

Furthermore, in order to start fast forwarding of the motor drive circuit 20 described above, the FF 99 must be set, and for this purpose a signal Q is required.
8, this FFI 11 is formed in FF111.
is reset by a coincidence signal in the fast-forward state of the pointer, and is also reset at time 1 in FIG. Then, the signal Q becomes rHJ, and after that, the fast forward stop trigger makes the signal C valid until the analog pointer catches up with the current time. That is, when the normal time is being indicated, this signal Q is rLJ.
Therefore, the FF 99 always sets its output S to rHJ, and never stops fast forwarding or stops supplying the normal time signal.

Overall timing of FIG. 4 In FIG. 7, when the changeover switch 50 is turned on, the changeover signal G becomes rHJ at time tv (+3), and after a slight delay, the prohibited section detection signal E is output. j
As a result, the fast-forward switching signal T is supplied to the hand-feed and provisional time counter 34 using the fast-forward clock as the hand position signal H (to).

The time indicator +2 indicates the output of the signal Q that enables the stop of fast forwarding, and on the other hand, the fast forwarding started from time t11 continues, and at time t+3 (+4), the pointer retreats from the display section 24 and the signal S is output. Fast forwarding ends when the flag is reversed to "L".

When the user completes the timekeeping operation of a stopwatch or the like and turns off the switch 50 (time TM), the switching signal G becomes rLJ, and after a short time elapses, the switch 50 turns off at time t.
A return signal B is output to +5, and as a result, FF99 of the motor drive circuit 20 is reset. Therefore, the AND gates 91 and 92 listen, and at this time, the FF 94 still holds the fast-forward switching signal T in the rHJ state, so
The output H of the OR gate 93 becomes a fast-forward clock, and the analog hand is fast-forwarded. This fast-forward tracking is performed in the same way even when the current time has overtaken the retracted position of the analog hand, or before it has overtaken it. In the present invention, by increasing the frequency of the fast-forward signal, Even if you fast forward the minutes, it is possible to make the analog hand catch up to the current time in a short time.

At time t16, the -number circuit 42 outputs a coincidence signal, and thereby the fast-forward switching signal T changes to rL.
J, the chasing fast-forward is completed, and the pointer position signal H becomes a normal time display signal, allowing the normal time display state to be restored.

[Effects of the Invention] As explained above, according to the present invention, in an analog-digital watch that combines an analog pointer display and a digital display, and in which the digital display can selectively display both time and timekeeping, the analog pointer When it overlaps the digital display, it is fast-forwarded to a predetermined retracted position, and after digital timekeeping is completed, the analog hand is fast-forwarded to follow the current time, allowing the normal time display to be returned in a short time. It becomes possible to obtain a clock whose time display is easy to read.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing a preferred embodiment of an analog/digital display timepiece incorporating a pointer retraction device according to the present invention, and Fig. 2A shows a display position signal in a state where the pointer and the digital display section do not overlap. 2B is a timing chart showing the relationship between the display time signal and the pointer position signal, which shows the fast-forwarding effect when the analog pointer overlaps the digital display; FIGS. 3A and 3B are timing charts showing the relationship between the pointer position signal and the pointer position signal. 4A and 48.4C are explanatory diagrams showing the analog and digital display states corresponding to FIG. 2A, FIGS. 4A and 48.4C are explanatory diagrams showing analog and digital display sections corresponding to FIG. 2B,
Figures 58.5C, 50, 5E, and 5F are explanatory diagrams of the analog and digital display sections showing other display states of this example, and Figure 6 shows an example of the changeover switch circuit and pointer return circuit in Figure 1. FIG. 7 is a timing chart showing the overall operation of FIG. 9 is a circuit diagram showing an example of the pointer position detection circuit in FIG. 1, FIG. 10 is an explanatory diagram of the pointer position detection function in FIG. 9, and FIG. 11 is an example of the motor drive circuit in FIG. 1. FIG. 12 is a circuit diagram showing an example of the fast-forward control circuit in FIG. 1. 10... Reference clock source 14... Analog pointer 16... Motor 20... Motor drive circuit 22... Right time counter 24... Digital display section 30... Changeover switch circuit 34... Temporary time counter 36 ... Pointer position detection circuit 38 ... Fast forward control circuit 40 ... Pointer return circuit 42 ... -Several circuits

Claims (1)

[Claims] (1) A reference clock source, a motor driven by the reference clock to enable fast forwarding, an analog pointer rotated by the motor to display an analog time, and selectively displaying a desired time and timekeeping contents based on the reference clock. a digital display section for digital display, and an analog/digital display clock in which the analog pointer overlaps the digital display section; a changeover switch for switching the time and timekeeping operation of the digital display; a temporary time counter that counts a pointer position signal supplied to a motor to rotate the analog pointer; and a digital display of the contents of the temporary time counter. a pointer position detection circuit that detects that the pointer overlaps with the area; a coincidence circuit that compares the contents of the correct time counter and the provisional time counter; a motor drive circuit that drives the motor to enable fast forwarding; Controlling the fast forwarding of the motor drive circuit, when the changeover switch selects the timekeeping operation, when the analog pointer overlaps the digital display section, the analog pointer is quickly moved back to a predetermined position, and the changeover switch returns to the timekeeping operation. An analog pointer retraction device for an analog/digital display clock, comprising: a fast-forwarding control circuit for rapidly forwarding an analog pointer until it matches the current time;