JPS6020073Y2 - Analog display device for electronic clocks - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an analog display device in an electronic watch that displays the display in the same way as a hand.

Conventionally, electronic clocks with digital display have mainly been used.

This is convenient when reading the time as it is, but when reading intuitively the time interval from the current time to the time, the conventional pointer display is easier to read.

From this point of view, it has been proposed that electronic watches have a display similar to the conventional pointer display.

This invention provides an electronic watch with a display similar to that of conventional hands.

In particular, the present invention provides an analog display device for an electronic timepiece that also displays a second hand, which also serves as a minute display.

Hereinafter, an embodiment of an analog display device for an electronic timepiece according to this invention will be described with reference to the drawings.

In FIGS. 1 and 2, six bar-shaped display elements are formed on one surface of a circular insulating plate 11 at equiangular intervals around the center thereof.

In this example, a fluorescent display is used.

A fluorescent display element is provided for 60 lines from S59 to S59.

Each display element S. Anode 12 is formed on substrate 11 along this position at position -859, and phosphor layer 13 is formed on it.
are formed to constitute a rod-shaped display element.

Rod-shaped element S for hour display.

Two short display elements T are located on the extension of the display element So outside the arrangement circle of −559.

is provided, and from this, a display element "595109 S15."595109 S15.
. . . Corresponding to display element T1. T2. T3...
... will be established.

Rod-shaped display element S.

A disk-shaped inner electrode 16 centered at -559 is provided facing these display elements, and a plate ring-shaped outer electrode 17 is further provided outside the disk-shaped electrode 16 to face the display elements.

In this example, since the display is a phosphor display, the inner electrode 16 and the outer electrode 17 are configured as a grid.

The boundaries of these inner electrodes 16 and outer electrodes 17 are made as close as possible to each other, and their positions are selected so as to face, for example, a ⅓ position on the outside in the longitudinal direction of the rod-shaped element 8.

A cathode 18 is disposed on the opposite side of the inner electrode 16 and outer electrode 17 from the substrate 11.

When displaying the hour, a voltage is applied to the inner electrode 16,
No voltage is applied to the outer electrode 17 and one of the rod-shaped elements is selected for display, and when displaying minutes, both the outer electrode 17 and the inner electrode 16 and one display element are selected. selected and displayed.

The equal division display and the hour display are not performed at the same time, but are performed periodically at different times, for example, alternately.

To the human eye, the images are switched at high speed and displayed as if they were being displayed continuously.

In this invention, in addition to the hours and minutes, seconds are also displayed in the same manner as minutes, that is, one rod-shaped display element, an outer electrode, and an inner electrode are selected for display.

A drive circuit for this purpose is configured as shown in FIG. 3, for example.

A clock pulse from a reference oscillator 21 is frequency-divided by a frequency divider circuit 22 and further frequency-divided by a frequency divider circuit 23.

This frequency-divided output is made to be a one-second clock pulse, and this output is supplied to a second counter 25 through a changeover switch 24.

The switch 24 is for time adjustment, and can be switched to the output side of the frequency divider circuit 22 for low-speed adjustment, and can be switched to the output side of the oscillator 21 for high-speed adjustment, and can be switched to the output side of the oscillator 21 for high-speed adjustment. It is possible to supply the output of

The second counter 25 is supplied to a decoder/display drive circuit 27 through a second drive circuit 26.

The carry pulse of the second counter 25, that is, the pulse every minute, is given to a counter 28, and the count contents of this counter 28 are passed through a minute drive circuit 29 to a decoder/display drive circuit 27.
supplied to

Counter 3 of 1 minute pulse is 1112 from minute counter 28
1 to produce pulses every 12 minutes, the pulses are counted by the hour counter 32, and the counted contents are supplied to the decoder/display drive circuit 37 through the hour drive circuit 33.

For example, a switching pulse generation circuit 34 that oscillates at a frequency of several KHz is provided, and its output is supplied to a 3-bit ring counter 35, which output terminals "s," 2! ”3
The three outputs are the second drive circuit 26 and the minute drive circuit 2, respectively.
9. The pulse is supplied to each chip selection terminal of the time drive circuit 33, and while the pulse is applied, the drive circuit is in an operating state and operates to supply the contents of the corresponding counter to the decoder/display drive circuit 27. .

On the other hand, a display voltage is always applied to the inner electrode 16 from the terminal 36, but the display voltage to the outer electrode 17 through the terminal 37 is determined by the output of the terminal for selecting the time drive circuit 33 being given through the inverter 38, and the display voltage being applied to the outer electrode 17 through the terminal 37. When the circuit 33 is in operation, the outer electrode 17 is at a low level; otherwise, the outer electrode 17 is at a high level.

For example, as shown in FIG.
Pulses are generated sequentially from i, "2?"3, and the second drive circuit 26 and minute drive circuit 2 are activated by the generation of the pulses, respectively.
9, the drive circuit 33 becomes operational.

On the other hand, the inner electrode 16 is always kept at a high level to which a display voltage is applied, as shown in FIG. A display voltage is applied.

For example, at the time of 0:03:05, when the clock is at a high level, the second drive circuit 26 is driven, and the content of the second counter 25 at that time is 5, and a voltage is applied to the display element S5, so that the display element S5 Luminescent display is displayed over the entire length.

Next, when the terminal t2 becomes high level, the minute drive circuit 29 becomes operational, and at this time, the count content of the minute counter 28 is 3, and therefore a voltage is applied to the display element S3, which also emits light over its entire length. .

Next, when the terminal t3 becomes high level and the hour drive circuit 33 enters the driving state, the content of the hour counter 32 is 0 and the display element S is at that time.

However, at this time, the display voltage is not applied to the outer electrode 17 and is at a low level, so that the display element S.

does not extend over its entire length, but only the portion facing the inner electrode 16 exhibits a short luminous display.

In this way, the display of each part, minute, and hour corresponding to 0:03:05 is switched and performed, and because the speed was switched to a higher speed than the second signal, the movement status of the second hand is also displayed. become.

The right hand portion of FIG. 4 similarly shows the waveforms of various parts when 1 hour, 6 minutes, and 2 seconds is displayed.

As described above, according to the analog display device for an electronic timepiece according to this invention, by displaying the seconds using the same driving state as for displaying the minutes, it is possible to display the analog display including the second hand.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of an analog display device for an electronic watch according to this invention, FIG. 2 is a sectional view taken along line A-A, and FIG.
The figure is a block diagram showing an example of the electric circuit, and FIG. 4 is a waveform diagram of its operating state. So~Turtle, : Rod-shaped display element, 16: Inner electrode, 17: Outer electrode, 25: Second counter, 28: Minute counter, 32:
Hour counter, 26: Second drive circuit, 29: Minute drive circuit, 3
3: Time drive circuit, 27: Decoder and display drive circuit, 34
: pulse generator, 35: switching pulse generator.

Claims (1)

[Claims for Utility Model Registration] The basic clock is divided by at least a second counter, a minute counter, and an hour counter, the second counter counts clocks with a one-second period, and the minute counter counts clocks with a one-minute period. The above-mentioned hour counter counts a 12-minute cycle clock, and the contents of the above-mentioned hour counter are periodically given to the display driving circuit, and the contents of the minute counter and the contents of the above-mentioned hour counter are periodically set without matching. The display driving circuit drives the fluorescent display tube, and when the contents of the time counter are given, a short radial pattern is applied to the center of the display surface of the fluorescent display tube at an angle corresponding to the time. In an analog electronic watch, when the content of the minute counter is given, a radial display longer than the hour display is displayed at an angle corresponding to the content with respect to the center. 60 rod-shaped display elements each consisting of an anode and a phosphor layer are formed radially on a substrate at equal angular intervals, and the center of each rod-shaped display element is a disc-shaped inner grid electrode with the center S. A ring-shaped outer grid electrode is disposed facing the element and close to the outer periphery of the inner grid electrode, and is disposed opposite to the rod-shaped display element. A switching display signal generator is provided, which includes a cathode arranged opposite to the element, and repeatedly generates a second display signal, a minute display signal, and an hour display signal in sequence, and is controlled by the second display signal to control the second counter. The contents of the minute counter are supplied to the display drive circuit, the contents of the minute counter are supplied to the display drive circuit under the control of the minute display signal, and the contents of the hour counter are supplied to the display drive circuit under the control of the hour display signal. A display voltage is always applied to the inner grid electrode, and a display voltage is applied to the outer grid when the minute display signal and second display signal are generated, but the application is stopped when the hour display signal is generated. . An analog display device for an electronic timepiece, wherein the display drive circuit is configured to decode the contents of an input counter and apply an anode voltage to a corresponding one of the bar-shaped display elements.