JPH0233192A - Energy-saving display device - Google Patents

Abstract

PURPOSE:To set a display of a CRT to ON and OFF by detecting an operator's motion such as an approach, a separation, etc., by transmitting an ultrasonic wave in the prescribed direction, and also, receiving its reflected wave. CONSTITUTION:A transmitting part 3 of an ultrasonic wave center transmits steadily an ultrasonic wave in the prescribed direction by a signal fa1 from a transmission driving circuit 7, and its reflected wave is received steadily by a receiving part 4. In this state, when an operator approaches a CRT display device 1, the ultrasonic wave from the transmitting part 3 is reflected by the operator, a part thereof is detected by the receiving part 4, and the detection signal fa1 passes through a receiving circuit 8 and inputted to a microprocessor MPU 10. The MPU 10 executes an arithmetic processing operation, based on a program in a memory 9, detects phases of the transmitting and the receiving waves fa1, fa2, and sends out a power source connecting signal fd1 to an SSR driving circuit 14 in accordance with its phase difference. The phase difference which has been detected is stored as fb2 in the memory 9. The MPU 10 sends a control signal (fe) to a video RAM 12 at the time of sending out the signal fd1, and allows the device 1 to redisplay a state.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a CRT (cathode ray tube) display device installed in automatic processing machines, etc.
This invention relates to a T display device.

[Prior Art] Generally, some automatic processing machines have a control panel equipped with an operation panel and a CRT display device.

In processing machines that use a CRT to display status in this way, in order to save power and prevent ion burning on the CRT, the CRT is automatically displayed after a certain period of time after the operator performs an operation on the operation panel. Many are configured to hide the display.

[Problems to be Solved by the Invention] However, after the display on the CRT is turned off, in order to make the CRT display the status again, it is necessary to press some key on the operation panel, which is cumbersome and This was inconvenient as it was easy to make operational errors.

In order to overcome this drawback, it is also possible to apply an automatic door opening/closing mechanism to detect when an operator approaches the CRT and cause the CRT to display again. However, when such a device is used, if a package or the like is placed on the detection device, the CRT will be in a continuous display state, and the purpose of saving power or the like may not be achieved.

Therefore, an object of the present invention is to provide a CRT display device that does not operate depending on the arrangement of the above-mentioned luggage, etc., can accurately detect only the operator, and does not require the operator to perform a redisplay operation. It is in.

Another object of the present invention is to provide a CRT display device suitable for injection molding machines.

Means for Solving the Problem] According to the present invention, in a display device for driving a C'FLT and a CRT, a transmitting ultrasonic sensor that transmits ultrasonic waves and a receiving ultrasonic sensor that receives reflected waves are provided. detecting means having a sensor; and determining whether or not the operator has moved by detecting temporal changes in the detection signal from the detecting means.
An energy-saving display device characterized by comprising a control means for controlling connection and cut-off of an RT power source is obtained.

[Function] The energy-saving CRT display device according to the present invention transmits ultrasonic waves in a predetermined direction and receives reflected waves to detect movements such as approaching or separating the operator. A CRT display device that turns on and off the CRT display is obtained.

[Example] Embodiments of the present invention will be described with reference to the drawings.

First, the overall configuration of an energy-saving display device according to an embodiment of the present invention will be described.

FIG. 1 is a front view showing an example of the configuration of an energy saving display device. In this figure, a CR7 display device 1 constituting an energy-saving display device includes a CR7 screen 2 and an ultrasonic sensor provided on the CR7 screen 2. It has a wave receiving section 4 that receives reflected waves of the ultrasonic waves.

FIG. 2 is a perspective view showing the CR7 display section shown in FIG. 1 attached to a control panel. In this figure, the control panel 5
On the top, a CR7 display device 1 and an operation panel 6 are arranged side by side.

When an operator approaches the illustrated control panel 5, an ultrasonic sensor detects the operator's proximity as described later, and the CR7 screen 2 automatically lights up based on the detection signal of the ultrasonic sensor to display the status. A redisplay occurs.

Next, the configuration of the energy saving display device according to the embodiment of the present invention will be described in more detail with reference to FIG.

As shown in FIG. 3, the energy saving display device according to the embodiment of the present invention includes a detection section 20, a control section 30, and a display section 40.

The detection unit 20 has an ultrasonic sensor, and the illustrated ultrasonic sensor drives the wave transmitting unit 3 in addition to a wave transmitting unit 3 that transmits ultrasonic waves and a wave receiving unit 4 that receives reflected ultrasonic waves. It has a wave transmitting drive circuit 7 and a wave receiving circuit 8 connected to the wave receiving section 4. The wave transmitting drive circuit 7 and the wave receiving circuit 8 are controlled by the control unit 30
It is connected to a microprocessor 10 provided in the. In addition to the above-mentioned microprocessor 10, the control unit 30 includes a memory 9 coupled to the microprocessor 10, an operation panel 15, and a solid state relay (SSR) that controls connecting or disconnecting the power to the CRT. The SSR drive circuit 14 is configured to drive the SSR drive circuit 14.

The display section 40 consists of the CR7 display device 1 shown in FIGS. 1 and 2 and the video RAM 12 connected thereto,
Video RAM 12 is connected to microprocessor 10.

The operation of each part of the energy saving display device according to the embodiment of the present invention will be explained.

First, the wave transmitting section 3 of the ultrasonic sensor regularly transmits ultrasonic waves in a predetermined direction using the signal fa from the wave transmitting drive circuit 8, and the reflected waves from this direction are constantly received by the wave receiving section 4. has been done. When an operator approaches the CR7 display device 1 in this state, the ultrasonic waves emitted from the wave transmitting section 3 are reflected by the operator, and a portion of the ultrasonic waves are detected by the wave receiving section 4. The detection signal fa detected at this time is inputted to the microprocessor 10 as time-series data via the wave receiving circuit 7.

The microprocessor 10 performs arithmetic and processing operations based on a program stored in the memory 9 in advance, detects the phases of the transmitted and received waves fa, , fa, and outputs a power supply connection signal fd according to the phase difference to the SSRwAWIJ. The signal is sent to circuit 14. Further, the detected phase difference is stored in the memory 9 as fb2. The SSR drive circuit 14 receives the input power supply connection signal fd.

The 5SR13 is driven based on the 5SR13 and the power is connected to the CRT.

Furthermore, when sending out the signal fd, the microprocessor 10 causes the detection unit 30 to send out a display control signal fe to the video RAM 12 to cause the CR7 display device 1 to display the status again.

Further, when the operator stops operating the operation panel 15, the microprocessor 10 sends a power cutoff signal fd2 to the SSR drive circuit 14 after a certain period of time, and the SSR is activated.
R7 Turn off the power to the display device 1. On the other hand, if the operator
When the microprocessor 10 detects that the user has left the R7 display device 1 by monitoring ultrasonic waves, the SSR
A power cutoff signal fds is sent to the driver 14 to the SSR drive circuit, and the SSR is activated to cut off the power.

Here, when the operator is near the CR7 display device 1, the operator's movement is small, and therefore the phase difference of the detection signal fa+ representing this movement is also minute, so the detection signal fa
The SSR drive circuit 14 can also be configured so as not to shut off the power when there is a slight positive fluctuation.

FIG. 4 is a diagram showing an example of wave transmission and reception by the wave transmitting section 3 and the wave receiving section 4. In this figure, the waveform of the transmitted wave is indicated by 63, and the waveform of the received wave is indicated by 64. Based on the program read from the memory 9, the microprocessor 10 issues a pulse modulation command to the wave transmission drive circuit 8 at regular intervals (T). The wave transmitter 8 is driven to transmit ultrasonic waves for a predetermined period of time at regular intervals (T). The transmitted ultrasonic wave is reflected by an object, received by the wave receiving unit 4, and converted into an electric signal having a received waveform 64 as shown in FIG. 4 by the wave receiving circuit 8. Due to the path difference between transmitting and receiving waves, there is a difference of 7*-11i.
, t, +1, etc. are generated.

For example, if the operator does not approach, there are immovable fixed objects in the surrounding environment, so the reflected wave t is received with a substantially constant delay time compared to the transmitted wave.

However, when the operator approaches the ultrasonic sensor, the delay time t, of the reflected wave gradually becomes shorter than the delay time t, -3 of the previous pulse.

On the other hand, when the operator moves away from the CR7 display device 1, the delay time t, of the reflected wave gradually becomes longer than the delay time t,-1 of the previous pulse.

That is, if 1-++ > 1- > 1-+, leave, t
, +1<1. If < 1−−+, it can be seen that they are close.

In this case, the microprocessor 10 measures the time from when the pulse modulation command is sent until the wave is received by the wave receiving circuit, and stores it in the memory 9 . Accumulated tl +・・・・・・
The data of tm...ts-1+js+ta is Δtl=t2-t+Δj2=ts-j,
2,...Δtm=tm++ -tm+Δ
ts = t, , -t.

When Δt is large, the microprocessor 10 outputs an operation signal to the SSR drive circuit 14 to drive the SSR, and when the operator approaches, the microprocessor 10 outputs an operation signal to the SSR drive circuit 14 to drive the SSR, and the power supply is
It is connected to the R7 display device 1.

Further, the data of Δtn is stored in the memory 9.

When the microprocessor 10 determines that Δt has increased in this way, the memory 9
The power of the R7 display device 1 is turned on again, and the status is displayed again on the CR7 display device 1 via the video RAM. Further, the microprocessor 10 sends a signal to the SSR driver 14 to turn off the power to the CR7 display device 1 after a certain period of time after there is no input from the operation panel 15, thereby turning off the CR7 display device 1. If the person approaching is not the operator,
When a baggage or the like is placed, even if it is mistakenly recognized as the operator the second time, the power to the CR7 display device 1 can be turned off again after a certain period of time, and the baggage will not be identified as the operator again.

If the above operation is performed using a flowchart, it will be as shown in FIG. By turning on the switch on the operation panel, CR
7 Each part other than display device 1 is always energized, but C
Since the R7 display device 1 consumes significantly more power than the microprocessor 10, the R7 display device 1 consumes much more power than the microprocessor 10.
It is possible to prevent ion burn on the CR7 screen 2 due to energization of the CR7 display device.

[Effects of the Invention] As explained above, according to the present invention, since the approach of the operator is automatically detected, the movement is judged, and the display is re-displayed, there is no need for the operator to perform a re-display operation. It is possible to provide an energy-saving display device that can significantly save the power used for CR7 display when the operator is not present.

3 is a wave transmitter, 4 is a wave receiver, 5 is a control panel, 6 is an operation panel, 7 is a wave transmitter drive circuit, 8 is a wave receiver circuit, 9 is a memory, 10
is a microprocessor, 12 is a video RAM, and 13 is an S
SR, 14 is the SSR drive circuit, 15 is the operation panel, 16
is a power supply, 20 is a detection unit, 30 is a control unit, 40 is a display unit,
63 is a transmitting wave, and 64 is a receiving wave.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an energy saving display device according to an embodiment of the present invention, FIG. 2 is a perspective view showing an example of the energy saving display device, and FIG. 3 is a block diagram of the energy saving display device shown in FIG. 1. , FIG. 4 is a diagram showing an example of the transmitted and received waveforms of the transmitting and receiving parts of the energy saving device of FIG. 1, and FIG. 5 is a flowchart of the operation of the energy saving display device according to the embodiment of the present invention. It is a diagram. In the figure, 1 is the CR7 display device, 2 is the CR7 screen, Figure 5

Claims (1)

[Claims] 1. A display device equipped with a CRT and a CRT power source, which includes: (a) a detection means having a transmitting ultrasonic sensor that transmits ultrasonic waves and a receiving ultrasonic sensor that receives reflected waves; (b) a control means for determining the presence or absence of movement of the operator by detecting temporal changes in the detection signal from the detection means and controlling connection or cutoff of the CRT power supply. Energy display device.