JPS5813873B2 - hodosokuteisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that uses a plurality of "day"-shaped segments to detect the light intensity of a clock that digitally displays time, and to measure the rate.

The purpose of this device is to accurately measure digitally displayed clocks.

With the development of clocks with photoelectric daisicle time display mechanisms, it has become difficult to measure time using conventional mechanical clocks and electronic (analog) clocks, which utilize the ticking, magnetic leakage, and hand movement.

Therefore, we came up with the invention of this light amount detection device for rate measurement.

This invention measures the rate by converting the magnified cycle of light quantity changes in the display mechanism of a timepiece into an electrical signal using a photoelectric conversion element, and then amplifying the signal and comparing it with a standard signal.

Therefore, as one embodiment of this device, the daily difference measurement of a watch having a liquid crystal display mechanism will be explained with reference to FIGS. 1, 2, and 3.

In Figure 1, the display illuminance of the watch is adjusted to the sensitive area of the photoelectric conversion element ■ using the illumination lamp ■, and the amount of change in light within the field of view is increased by enlarging the display surface of the watch using the magnifying glass ■. A change in the contrast of the segment is detected and input to a photoelectric conversion element.

The incident light is converted into an electric signal by a photoelectric conversion element, and a change in the amount of light on the time display surface is converted into an electric signal.

The detected signal enters the standard clock (2), which is amplified by the amplifier (2), and the daily difference is measured by comparing it with the standard clock.

In the case of a digital display clock, unlike the rate measurement of an analog display clock, which detects the position of a pointer that always moves on a fixed trajectory, it detects changes in the contrast of the display segments, so the "day" shaped segment The overall contrast change is not constant and difficult to measure.

FIG. 2 shows a timing chart of contrast changes in each segment of the "Japanese" character segment.

FIG. 2 is an example of a segment displaying seconds digits, in which numbers from 0 to 9 are sequentially displayed every second, and return to the initial display of 0 at intervals of 10 seconds.

Most of the contrasts in each segment at that time do not have a constant period.

Of the seven segments from ■ to ■ that make up the Japanese character, ■
and ■, that is, the upper right segment and lower right segment of the ``mark'' shape have periodicity.

Therefore, by observing only the ■ or ■ segments,
Rate measurement is possible by detecting the period of contrast change.

Incidentally, by performing appropriate arithmetic processing, it is also possible to measure the rate by detecting contrast changes in other segments, but in that case, the measuring device becomes expensive.

Furthermore, for more accurate measurements, there is also a method of using digit display for 10 seconds.

This device uses a seconds digit display to measure daily differences.

Next, expansion of a predetermined segment (FIG. 3) will be explained.

The center of the segment to be enlarged is aligned with the center of the field of view of the magnifying glass, and the position of the photoelectric conversion element is aligned so that it goes to the center of the field of view.

This is because even if some segments other than the segment to be measured fall within the field of view, stable measurement values can be obtained with little worry of noise.

This device enables accurate measurement of rate using changes in the time display surface of a clock, and has the effect of mechanizing rate measurement.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the device, FIG. 2 is a timing chart of liquid crystal display segments, and FIG. 3 is an enlarged view of the segments using a magnifying glass. ■・・・Clock, ■・・・Lighting, ■・・・
・・Magnifying glass, ■・・・Photoelectric conversion element, ■・・・・
・・Amplifier, ■・・・Standard clock, ■〜■・・・・
...Each segment.

Claims (1)

[Claims] 1. A rate measuring device for a watch that digitally displays the time using a plurality of "day" shaped segments, which includes means for illuminating and enlarging the segments, a photoelectric conversion element that converts changes in light intensity into electrical signals, and a device that amplifies the electrical signals. An amplification/comparison means for comparison with a standard signal is provided, and the upper right or lower right segment of the seven segments constituting the "Japanese"-shaped segment is irradiated and enlarged, and a contrast change of the segment is detected in light quantity; A rate measuring device characterized in that the rate is measured based on the period of the contrast change.