JP2003070768A - System for detecting posture of vdt worker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for detecting a posture of a VDT worker to realize right working environment with less fatigue and obstacles. SOLUTION: A position and/or a sight distance of a worker 5 facing the display 4 of an information processing device 3 is detected by an eye-sight sensor 6 placed on the display 4. When a detected value exceeds a arrange optimum for work, an alarm is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture detection system for a VDT worker, and more particularly to a posture detection system for a VDT worker for detecting the posture of the VDT worker and realizing a correct working environment with less fatigue and obstacles. The present invention relates to a posture detection system.

[0002]

2. Description of the Related Art In recent years, in offices, factories or homes,
An information processing device having a display such as a personal computer (hereinafter referred to as “personal computer”) has been commonly used, and its usage time has been lengthened. Here, since people who work with a personal computer or the like do the work while looking at the screen of a flat panel display such as a CRT display or liquid crystal, a VDT (Visual Display Termi
nal: Visual display device) Called an operator.

What can generally be said about a human posture from a physiological point of view is that it is preferable that a human does not have one correct posture but that the posture can be changed freely. In other words, the muscles need to be moved appropriately because they will get tired if they continue to have the same tension without exerting a great force. Regarding the posture of the VDT worker involved in program development, the distance between the display and the worker, that is, the visual distance, is 46.1 on average.
There is statistical data of cm, and the standard deviation showing fluctuation is 7.4 cm. This data means that the VDT worker continues to be in a very restrained posture, and the neck pain and stiff shoulder in the VDT worker, which has become a problem in recent years, as well as fatigue such as dry eye and visual acuity deterioration, It causes a failure.

In order to avoid physical fatigue and obstacles in such a VDT worker, work in a correct posture, take an appropriate break and move the body, and perform work for a certain time or more per day. There are things such as not being there, but even if you know it, it is true that you are absorbed in the work and are in a bad posture, or you are working for a long time in the same posture. However, conventionally, even in such a case, no mechanical system has been provided to issue a warning or advise.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to provide a posture detection system for a VDT worker for realizing a correct working environment with less fatigue and obstacles. In point.

[0006]

In order to solve the above-mentioned problems, the present invention provides the display of an operator's eye position or visual distance or both eye position and visual distance with respect to the display of an information processing device. A posture detection system for a VDT worker is constructed, which is detected by a visual sensor provided and gives an alarm when the detected value exceeds an appropriate work range.

An alarm is issued when the value detected by the visual sensor is within a proper work range for a certain period of time or more, or when the integrated time within the proper work range is equal to or longer than a set time. I chose

Here, a CCD camera is mounted as the visual sensor on the upper part of the display, and the image data of the eyes of the worker imaged by the CCD camera is processed by the image processing software incorporated in the information processing device. It is preferable that

As the alarm and means for issuing the alarm, any one of vibration by a vibrating body provided in a chair, light emission by a light emitting body arranged at a predetermined position, sounding by a speaker, display on the display, or a combination thereof. Is preferably used.

[0010]

Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. 1 to 3 show a VD using a posture detection system for a VDT worker according to the present invention.
In the figure, reference numeral 1 is a desk, 2 is a chair, 3 is a personal computer, 4 is a display, 5 is a worker, and 6 is a work.
Is a visual sensor, and 7 is the operator's eyes.

For VDT work, the top plate 8 of the desk 1 is connected to the personal computer 3
The display 4 is placed, the worker 5 sits on the chair 2, and the keyboard 9 placed on the front part of the top 8 is operated. From an ergonomic point of view, the line of sight of the person sitting relaxed on the chair 2 is inclined downward by about 35 degrees from the horizontal. The most important optimum position of the display 4 is within ± 15 degrees of the horizontal and vertical directions of the line of sight. Further, the distance between the eyes 7 of the worker 5 and the display 4, that is, the optimum range of the visual distance is determined by various factors.
It is said that the manufacturer's numerical value is 40 cm or more, and the optimum viewing distance for office work in a sitting position is 60 cm, but it is usually 45 depending on the preference of individual workers 5 and the difference in work content. ~ 75cm range (60 ± 15c
m) is the proper working range.

Therefore, the position of the chair 2 or the display 4 and the display 4 are adjusted so that the angle of the line of sight and the viewing distance are substantially center values within an appropriate range when the worker 5 is sitting relaxed on the chair 2. It is important to adjust the height and angle. The posture set to be optimal in this initial stage is called an optimum posture, and the setting is called an optimum setting.

The VDT worker posture detection system of the present invention is a system for detecting the position or the visual distance of the eyes 7 of the worker 5 or both the eye position and the visual distance with respect to the display 4 of the information processing device (personal computer 3). It is detected by the visual sensor 6 arranged at 4, and an alarm is issued when the detected value exceeds the proper working range. This work proper range is a range that is expanded from the above-mentioned optimum posture by an allowable range, and is set in advance. Alternatively, it can be set each time depending on the preference of the individual worker 5 and the difference in work content. For example, in the state of the optimum posture, by pressing the setting button or the like, the value detected by the visual sensor 6 is registered in the posture detection system, and the value deviated within the allowable range from this value is associated with the proper work range. It is possible to do so.

If the value detected by the visual sensor 6 exceeds the proper work range, the work posture becomes bad, causing fatigue or obstacle. In that case, a warning is issued and the work posture is always correct. Encourage them to work in.

The value detected by the visual sensor 6 is
An alarm is issued when the work continues within the proper work range for a certain period of time or when the integrated time within the proper work range exceeds the set time. Here, the fact that the value detected by the visual sensor 6 is within the proper working range for a certain period of time or longer means that the worker 5 is in a restrained posture, and physiologically. This will impede the blood flow action of the muscle pump due to repeated contraction of muscles, causing pain and stiffness in the shoulders and neck. Usually, this fixed time is about one hour. Further, if the value detected by the visual sensor 6 is longer than the set time within the proper working range, the working time for one day becomes long, causing eye fatigue and dry eyes. It also issues a warning in some cases. Usually, this set time is about 5 hours.

More specifically, a CCD camera is mounted as the visual sensor 6 on the display 4,
It is preferable in terms of cost to process the image data of the eyes 7 of the worker 5 imaged by the CCD camera by the image processing software installed in the information processing device (personal computer 3). However, in addition to the personal computer 3, image processing may be performed by an arithmetic device dedicated to the posture detection system of the present invention. The CCD camera may be the one provided in the display 4 of the personal computer 3 or the one attached to the display 4 afterwards.

In order to detect the position of the eye 7 from the image data picked up by the CCD camera 6, the contour of the eye 7 is recognized, the contour is calculated from the deviation from the optical axis of the CCD camera 6, and the visual distance is calculated. In order to detect, the absolute distance is calculated using the signal generated by the autofocus function when the eye 7 is focused using the autofocus function of the CCD camera 6. Alternatively, it is also possible to use the image data of the eye 7 in the proper posture as a reference and compare it with the image data when the eye 7 moves to detect the positional deviation and calculate the relative distance.

As the alarm and means for issuing the alarm, vibration by a vibrating body provided on the chair 2, light emission by a light emitting body arranged at a predetermined position, sounding by a speaker (both not shown), and the display 4 Any of the representations or combinations thereof can be used. In this case, it is also preferable to issue the above-mentioned alarm with a fluctuation of 1 / f.

FIG. 1 shows a state of VDT work in a proper posture. In the figure, D1 is the eye 7 and the CCD camera 6.
Is a distance that is actually measured, and L1 is a distance that is calculated by using the value of D1 described above. The visual distance used for actually determining the proper working range is L1.

FIG. 2 shows a state in which the worker 5 is in a forward leaning posture and the visual distance L2 is shortened. D2 is the distance between the eye 7 and the CCD camera 6. Further, FIG. 3 shows a state in which the worker 5 is in the backward tilted posture and the visual distance L3 is long. D3 is the distance between the eye 7 and the CCD camera 6.

[0021]

The V of the invention according to claim 1 is as described above.
The DT worker posture detection system detects the position or the visual distance of the worker's eyes with respect to the display of the information processing device or both the position of the eyes and the visual distance by a visual sensor arranged on the display, and the detected value is When the work proper range is exceeded, an alarm is issued, and the worker can be urged to take a correct posture with less fatigue and obstacles in the VDT work.

According to the second aspect of the present invention, even if the VDT work is performed in the correct posture, if the same posture is maintained or the work is continued for a long time, fatigue or trouble will occur. By doing so, efficient VDT work can be performed.

According to the third aspect, since the information processing device in the VDT work can be shared as a part of the attitude detection system, it can be provided at a low cost.

According to the fourth aspect, when the work proper range is exceeded, the operator can be surely notified of the alarm.

[Brief description of drawings]

FIG. 1 is a simplified side view showing a state where an operator is performing VDT work in an appropriate posture.

FIG. 2 is a simplified side view showing a state in which a worker is performing a VDT work in a forward tilted posture.

FIG. 3 is a simplified side view showing a state in which a worker is performing a VDT work in a backward tilted posture.

[Explanation of symbols]

1 desk Two chairs 3 Information processing equipment (PC) 5 workers 6 Visual sensor (CCD camera) 7th eye 8 Top plate 9 keyboard

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Claims (4)

[Claims] 1. A visual sensor disposed on the display detects the eye position or the visual distance of an operator or both the eye position and the visual distance with respect to a display of an information processing device, and the detected value indicates a proper work range. A posture detection system for a VDT worker, which is characterized in that an alarm is issued when it exceeds. 2. An alarm is issued when the value detected by the visual sensor is within a proper work range for a certain period of time or more, or when the integrated time within the proper work range is a set time or more. The posture detection system for a VDT worker according to claim 1. 3. A CCD camera as the visual sensor is mounted on the upper part of the display, and the image data of the eyes of a worker imaged by the CCD camera is processed by image processing software incorporated in the information processing device. The posture detection system for a VDT worker according to claim 1 or 2. 4. The alarm and means for issuing an alarm,
The vibration by the vibrating body provided on the chair, the light emission by the light emitting body arranged at a predetermined position, the sound output by the speaker, the display on the display, or a combination thereof is used. VDT worker posture detection system.