JPS584797B2 - Digital Hiyoji Dokei - Google Patents

Description

[Detailed Description of the Invention] When the present invention is built into a glow discharge tube that digitally displays time measurement values, an auxiliary display unit for minute division display or AM, PM display, etc. is attached, and this second display is provided. The present invention relates to a digital display timepiece configured to display seconds by lighting up a display unit or a display unit, for example, at one-second intervals.

Generally, digital display watches use display elements such as incandescent bulbs, glow discharge tubes, light emitting diodes, or liquid crystals to display the hours and minutes, but they often do not display the seconds.

For this reason, not only is it impossible to know the time in seconds, but it is also inconvenient that it takes one minute at worst to know whether or not the clock is operating normally.

In addition, in the case of a type that displays seconds, the light emitting display that changes every moment not only causes strong irritation to the human eye and is unpleasant, but also causes a dash of current to flow or generates noise each time it flashes. There are other inconveniences.

According to the digital display clock of the present invention, as mentioned above, the auxiliary display unit of the glow discharge tube that digitally displays the time measurement value is lit at a cycle of, for example, one second, and the elapsed time can only be known in seconds. You can immediately know whether the clock is measuring time correctly or not.

Further, according to the present invention, a DC voltage and a repetitive pulse wave voltage of a magnitude sufficient to faintly light the auxiliary display unit are applied to the auxiliary display unit, and low-intensity light and high-intensity light are alternately applied. Moreover, since it is generated periodically, the stimulation given to the human eye is extremely small, and the fear of dash current and noise generation is eliminated.

Furthermore, by switching between lighting using both DC voltage and pulse wave voltage and lighting using only one of them, it is also possible to distinguish, for example, between the wake-up operation set and other states.

The digital display timepiece of the present invention will be explained in detail below with reference to embodiments shown in the drawings.

In FIG. 1, glow discharge tubes 2 installed in a cabinet 1 are arranged in display units 3, 4, and 2 for displaying two-digit time numbers.
It has built-in display units 5 and 6 for displaying digits and minutes, auxiliary display units 7 for hour and minute separator display, and auxiliary display units 8 and 9 for AM and PM display. In order to display the current time in response to the output of the time measuring device, the lighting operation is performed using a well-known circuit configuration.

10 indicates a pilot lamp.

The auxiliary display unit 7 is a direct current display unit 7 indicated by ED in FIG. voltage and a pulse wave voltage E having a constant period T superimposed thereon
Lights up when P is input.

The DC voltage ED has a magnitude sufficient to light up the auxiliary display unit 7 at low brightness, and has a period t overlapping with the pulse wave voltage EP.
1, the auxiliary display unit 7 is lit with high brightness.

It is assumed that the period T is selected to be one second, for example, and the pulse wave voltage EP is taken out from the clock pulse generator of the time measuring device.

According to the digital display timepiece according to the present invention configured as described above, the auxiliary display unit 7 has a period t that appears every second.
1, and low-intensity lighting during the remaining period t2, which not only makes it possible to immediately see the passage of time in seconds and the presence or absence of time measurement operations, but also provides visual stimulation because the difference in brightness of the lighting is small. The degree of

In addition, not only is the generation of dash current and noise suppressed, but the ionization of the gas inside the discharge tube is always maintained by the auxiliary display unit 7 that is always lit, and the display units 3, 4, and 2 digits for the 2-digit time display are There is an advantage that even if the display units 5 and 6 for displaying numbers repeatedly flash by time-division operation, there is no ignition delay when lighting.

In the above embodiment, the display unit 7 for displaying the hours and minutes is blinked, but instead of this, the auxiliary display units 8, 9, etc. for displaying AM and PM may be blinked.

Of course, the period T of the pulse wave voltage EP is not limited to 1 second, but can be selected to 2 seconds, 3 seconds, or the like.

[Brief explanation of the drawing]

FIG. 1 is a front view of a digital display timepiece embodying the present invention.
FIG. 2 is a waveform diagram of the voltage applied to the auxiliary display unit of the glow discharge tube of the same timepiece. 1... Cabinet, 2... Glow discharge tube, 3, 4, 5, 6... Display unit, 7, 8, 9
...Auxiliary display unit.

Claims (1)

[Claims] 1. A glow discharge tube that digitally displays time measurement values has a built-in auxiliary display unit for displaying hours and minutes or for displaying AM and PM, and the voltage of the power supply connected to the auxiliary display unit is as follows. A digital display timepiece characterized by comprising a DC component large enough to faintly light up an auxiliary display unit, and a pulse wave component with a period of seconds, superimposed on the DC component.