RU5461U1 - DIGITAL WATCH - Google Patents

Abstract

An electronic clock containing a clock, a pulse counter, a decoder, a digital indicator of the current time and a control unit with start-stop schemes for timing, characterized in that the control unit includes a photodetector that is sensitive in the spectral region of the radiation of the television screen, an amplifier, to the input which is connected to a photodetector, a band-pass filter configured to transmit a variable component of the photoelectric signal with a frame or line scan frequency of the television image a signal, the input of which is connected to the output of the amplifier, and an electronic key, the input of which is connected to the output of the bandpass filter, and the output with schemes for starting and stopping the timing.

Description

ELECTRONIC CLOCK Useful model refers to the field of electronic devices, namely to electronic clocks used to measure the time spent watching TV or the time spent on a television computer monitor and other television equipment. Currently, in connection with the widespread introduction of television and the computerization of all areas of human activity, the relevance of monitoring the time of watching TV shows or working on television monitors is increasing. This is primarily due to the need to limit the impact of these devices on the eyes and psyche of people, especially children. The time of watching TV or working on a television monitor can be controlled using ordinary watches, such as electronic ones (see A. Semennikov // Desktop digital clock with a signal device. To help a radio amateur. Issue 82.-M .: DOSAAF.- 1983, p. .66). However, this requires constant distraction. There are known designs of electronic clocks that can be built directly into TV control units, which allows you to program their work, in particular, turn them on and off at specified times (see V.A. Korolkevich, A.N. Shvedov // Microprocessors in household appliances. Foreign electronic technology.Vyp.10.-M.: Central Research Institute of Electronics.- 1983, p.74). However, they actually allow you to control the operating time of the TV, and not the contact time of the viewer or operator with the monitor. 5 IPC G04F 10/00: HOIL 31/00

IS an electronic chess clock (see S. Luchin, A. Skoptsov, N. Kozlov. // Small-sized chess with a clock. To help a radio amateur. Issue 83. M .: DOSAAF.-1983, p.64). The watch has a direct countdown mode, which is started by pressing the start button and stopped by pressing the stop button in the control unit. The next time you press the start button, the time counting resumes. To set the indicator to zero, use the reset button. Another mode is the counting mode until the end of the specified time interval. At its end, a light signal is issued.

When measuring the time spent watching TV or working on a monitor using such a clock, for example, during the day, it is necessary to stop the time count in breaks by pressing the stop button and, when resuming, restart by pressing the start button. This creates inconvenience and reduces the accuracy of time control.

The proposed utility model solves the problem of automatically turning on the countdown in an electronic clock in the field of action of light radiation from a TV or monitor screen and turning off the count outside the field.

To achieve this technical result, the known device includes an electronic clock containing a clock, a pulse counter, a decoder, a digital indicator of the current e. Name and a control unit with start-stop and time-delay circuits, characterized in that the control unit includes a photodetector sensitive to the spectral region of the radiation of the television screen, an amplifier, to the input of which a photodetector is connected, a band-pass filter configured to transmit the variable component of the photoelectric signal a frequency of vertical or horizontal scanning of a television image whose input is connected to the output of the amplifier, and

an electronic key, the input of which is connected to the output of the band-pass filter, and the output with schemes for starting and stopping the countdown.

Signs that distinguish the proposed electronic clock from the above well-known, are as follows. The presence of a photodetector, sensitive in the spectral region of the radiation of the television screen, allows you to record the light radiation of the television image during viewing. The photoelectric signal amplifier of the photodetector increases the amplitude of the signal to a level sufficient to trigger the key that controls the start and stop of the timing. The band-pass filter selects the variable component of the photoelectric signal with the frame or line-scan frequency of the telezine image, preventing the key from extraneous light emission from working. An electronic key that is triggered when the voltage at its input changes, initiates, through the appropriate circuits in the control unit, the start-stop of the clock in hours when the photodetector enters the radiation area of the screen and when it exits. Returning to the radiation area leads to the resumption of the countdown.

The proposed utility model is illustrated by drawings.

In FIG. 1. presents a block diagram of an electronic clock, take it as a prototype (see S. Luchin. A. Skoptsov. N. Kozlov. // Small-sized chessboard with a clock. To help a radio amateur. Vol. 83.-M.: DOSAAF.-1983 .p. 64). The clock contains a master oscillator 1, which generates clock pulses, a control unit 2. that starts, stops, sets and resets the clock using the keypad 6 (respectively, the start, stop, set and reset buttons), counter-decoder 3. digital indicator of the current time 4 and a signaling device for the end of a predetermined period of time .-: Figure 2 presents a block diagram of a proposed utility model including a master oscillator 1. generating clock pulses, a control unit 2. performing start, stop, installation and reset os hours using the keypad 6 (respectively, the start, stop, set and reset buttons), the counter-decoder 3, the digital indicator of the current time 4, the signaling device for the end of the specified period of time 5, the photodetector 7, amplifier 8, band-pass filter 9 and key 10. The device operates as follows. A photodetector, when introduced by a viewer or an operator into the field of action of light radiation from a television screen, generates a photoelectric signal, which is amplified by an amplifier. The band-pass filter cuts off the signal components due to the presence of extraneous light in the room and electrical noise. The output of the filter is connected to the input of an electronic key that closes the control contacts in the presence of a signal and opens them in its absence. Closing contacts causes the inclusion of a countdown using the control unit. The countdown continues throughout the entire time that the viewer and the operator are in front of the television screen. Moving from the field of action the radiation of the screen leads to the disappearance at the output of the photodetector and the input of the signal key with a frame or line scan frequency. This causes the control contacts to open and interrupt the time count. Returning to the radiation field again leads to the closure of contacts and the resumption of counting. As a result, the digital readout will always display the automatically read integral time spent by the viewer or operator in front of the monitor. If necessary, you can pre-set the clock in counting mode to a specified value of the time interval. In case of exceeding the operating time of the specified interval, the signaling device is activated. To control unit

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It may also include a circuit that shuts off the TV. To control the time children watch TV, an encoder can be built into the watch, which prevents unauthorized access to the modes for setting the time interval, turning off the alarm, and the watch itself.

To determine the performance of the device, a mock-up was made with the block diagram shown in FIG. 2. In the prototype, a PD-ZA industrial silicon photodiode was used as a photodetector. The photoelectric signal amplifier was fabricated on the basis of the 544 UD1 industrial operational amplifier. The RC-type bandpass filter had a passband of 40-120 Hz, which ensured the passage of signals modulated by the frame frequency of TVs and monitors. Testing the layout showed a steady fixation of the television image and the inclusion of time counting at a distance of 5 m from the screen with a diagonal size of 51 cm on a standard TV. If necessary, the sensitivity could be increased or decreased by adjusting the gain of the amplifier. The accuracy of measuring time intervals in this device was 0.1 s.

The proposed device is simple to manufacture and can be used in industry, institutions and domestic conditions. Its use allows you to avoid overexposure to the eyes and psyche of operators working with television monitors, as well as viewers.

The device can be made in the form of watches, medallions, badges, mounted on glasses or built into the remote control of the TV. All units of the device can be manufactured using integrated semiconductor technology.

Claims (1)

An electronic clock containing a clock, a pulse counter, a decoder, a digital indicator of the current time and a control unit with start-stop schemes for timing, characterized in that the control unit includes a photodetector that is sensitive in the spectral region of the radiation of the television screen, an amplifier, to the input which is connected to a photodetector, a band-pass filter configured to transmit a variable component of the photoelectric signal with a frame or line scan frequency of the television image a signal, the input of which is connected to the output of the amplifier, and an electronic key, the input of which is connected to the output of the bandpass filter, and the output with schemes for starting and stopping the timing.