The digital clock is a clock type that displays the time digitally (ie in numbers or other symbols), as opposed to the analog clock, where time is indicated by the rotating hand position.
Video Digital clock
History
The earliest digital pocket watch was the invention of the Austrian engineer Josef Pallweber who invented his "jumping clock" mechanism in 1883. Instead of the conventional dial, clock-jumps featured two windows in an enamel dial, where hours and minutes were visible on rotating discs. The second hand remains conventional. In 1885, the Pallweber mechanism was already in the pocket watch market by CortÃÆ'  © bert and IWC; arguably contributing to the resurgence and subsequent commercial success of the IWC. The principles of the clock-hopping Pallweber movement have appeared in watches by the 1920s (Cortà © bert) and are still in use today (Chronoswiss Digiteur). While the original inventor did not have a watch brand at the time, his name had been raised by a newly established watch manufacturer.
Plato Clock uses a similar idea but a different layout. These spring pieces consist of a glass cylinder with columns inside, which are attached to small digital cards with numbers printed on them, which flip over as time passes. Plato Clock introduced in St. Louis World Fair in 1904, produced by Ansonia Clock Company. Eugene Fitch of New York patented the clock design in 1903. 13 years earlier Josef Pallweber had patented the same invention using a digital card (different from his 1885 patents using moving disks) in Germany (DRP No. 54093). The German factory Aktiengesellschaft fÃÆ'¼r Uhrenfabrikation Lenzkirch made digital clocks in 1893 and 1894.
The earliest patent for a digital alarm clock was registered by D.E Protzmann and others on October 23, 1956, in the United States. Protzmann and his colleagues also patented another digital clock in 1970, which is said to use a minimal number of moving parts. Two-side plates held digital numbers between them, while electric motors and cam teeth were out of controlled motion.
In 1970, the first digital watch with LED screens was mass-produced. Called Pulsar, and produced by Hamilton Watch Company, these watches were hinted at two years earlier when the same company created a digital clock prototype for Kubrick's 2001: A Space Odyssey. Throughout the 1970s, although the cost of digital watches was considerable, the popularity of the device continued to increase.
Over the years, many types of digital alarm clocks have been developed.
In Soviet Russia, the 7-segment digital clock is known as Electronics 7.
Maps Digital clock
Construction
Digital clocks typically use 50 or 60 hertz AC power oscillations or 32,768 hertz crystal oscillators as in quartz clocks to keep time. Most digital clocks display the clock in 24 hour format; in the United States and some other countries, the more commonly used clock sequence option is the 12 hour format (with some AM or PM indications). Some watches, like many digital watches, can be diverted between 12 hours and 24 hours. The analog-style facial emulation often uses the LCD screen, and it is also sometimes described as "digital".
Displays
To represent time, most digital clocks use seven segment LEDs, VFDs, or LCDs for each of the four digits. They generally also include other elements to indicate whether the time is AM or PM, whether the alarm is set, and so on.
Settings
If people find it difficult to manage time in some digital clock designs on electronic devices where clocks are not important functions, they may not be set at all, displaying defaults after being turned on, 00:00 or 12:00.
Digital clocks that run on mains electricity and do not have batteries must be reset each time the power crashes or when moved. Even if power is interrupted for a second, most hours still have to be reset. This is a special issue with an alarm clock that does not have a "battery" backup, because even a very short power out at night usually causes the clock to fail to trigger an alarm in the morning.
To reduce the problem, many devices designed to operate on household electricity combine the battery backup to maintain time during a power outage and during the time of disconnection from the power supply. Recently, some devices incorporate methods to set up time automatically, such as using radio time-out signals from atomic clocks, getting time from existing satellite television or computer connections, or by setting up at the factory and then maintaining the time since then with movement quartz supported by an internal rechargeable battery. Commercial digital clocks are usually more reliable than consumer watches. Multi-decade backup batteries can be used to sustain time as long as power is lost.
Using
Because digital clocks can be very small and inexpensive devices that increase the popularity of product design, they are often incorporated into all types of devices such as cars, radios, televisions, microwave ovens, standard ovens, computers, and cell phones. Sometimes its usefulness is debatable: a common complaint is that when time has to be set to Daylight Saving Time, many hours of households have to be re-adjusted. Automatic sync integration by radio timestamp reduces this problem (see Clock radio).
References
External links
- How it Works Digital Clock
- Digital Watch History
- Museum of Digital Rare Antique LCD Watch
Source of the article : Wikipedia
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