JPH0515838U - Desk alarm - Google Patents

Abstract

(57) [Summary] [Purpose] While sitting in front of a study desk or an office desk for a long time, it prevents the posture from unknowingly crouching and leaning forward. [Structure] The detection means 10 is installed near the rear edge of the desk 1,
A normal figure zone α and a false figure zone β are set on the coaxial line 16 extending obliquely upward from the detecting means 10 at a predetermined detection angle θ, and the normal emitting zone α and the false figure zone α are set from the light emitting portion of the detecting means 10. The detecting means 10 emits light toward the illegal appearance zone β and reflects light reflected from the object to be detected existing in any of the zones.
The position of the object to be detected is received by the light receiving part of the device and the alarm generation means issues an alarm when it is determined that the object to be detected is in the illegal zone β based on the detection signal from the detection means 10. did.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an alarm device such as a learning desk or an office desk, and more particularly to an alarm device for preventing the user from leaning forward while sitting in front of the desk for a long time.

[0002]

[Prior Art]

 If you continue to study or perform office work for a long time at a desk, you often unknowingly lose your posture and become bent forward to cover your desk. Not only accelerates physical and eye fatigue, but is not good for your health.

[0003] Therefore, it is conceivable that the desk is equipped with an alarm device that detects the state of a person who is facing the desk when the posture of the person becomes bad and issues a warning or the like to call attention. For example, as shown in FIG. 5, the alarm device includes a first detection sensor 2 provided at the front edge of the desk 1 and a second detection sensor 3 provided at the upper rear end of the desk 1. 1 The detection sensor 2 detects that a person is sitting on the chair 4 toward the desk 1, and the second detection sensor 3 detects whether or not the seated person 5 is in the correct posture at the position of the head 9. is there. The first detection sensor 2 and the second detection sensor 3 are both constituted by on / off switch sensors. For example, the determination circuit 6 as shown in FIG. An on / off signal can be input, an alarm command signal can be output to the alarm generating means 7 by a combination of these on / off signals, and a buzzer 8 or the like can be sounded to call attention.

[0004]

[Problems to be solved by the device]

 However, in the above alarm device, the second detection sensor 3 is set at substantially the same height as the head 9 of the occupant 5, and the sensor detects the head 9 of the occupant 5 to detect the posture. Therefore, even if the seated person 5 is bent forward, the posture is determined to be correct as long as the head 9 is detected. For example, not only when the head is located at the point a (position of the head when the posture is correct), but also when the head is at the point b (position of the head when the posture is incorrect), the correct posture is determined. If the head 9 reaches the position of point c when it is in the forward bending posture and is no longer detected by the second detection sensor 3, an alarm is finally issued, and as a result the points b and c If there is the head 9 between them, it will not be possible to issue an alarm as an incorrect posture.

Therefore, the technical problem to be solved by the present invention is that it is possible to reliably detect whether the posture is a correct posture or an illegal posture.

[0006]

[Means for Solving the Problems]

 In order to solve the above technical problems, the present invention provides a detecting means near the rear edge of a desk, and forms a normal zone on a coaxial line extending diagonally upward from the detecting means at a predetermined detection angle. An unauthorized zone is set, and light is emitted from the light emitting section of the detecting means toward the normal zone and the unauthorized zone, and the reflected light from the object to be detected in any zone is received by the detecting section of the detecting means. An alarm device for a desk, which receives the position of the object to be detected and, when it is determined that the object to be detected is in the illegal zone based on the detection signal from the detection means, issues an alarm from the alarm generation means. Is used as a means.

[0007]

[Action]

 According to the above-mentioned means, the detected object existing in the normal appearance zone or the illegal appearance zone is irradiated from the detection means, and the position of the detected object is detected based on the received light amount when the reflected light is received. An alarm is issued when it is determined that the detected object position is in the illegal appearance zone.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an alarm device according to the present invention. The alarm device detects a position of an object to be detected 10 and whether the object is in the normal appearance zone based on the detected value. Judgment means 11 for judging whether it is in the illegality zone, a timer circuit 12 for counting an alarm command signal continuously outputted from the judgment means 11 when the object is judged to be in the illegality zone, and beforehand. An alarm generating means 13 is provided for issuing an alarm after counting for a set predetermined time or longer.

As shown in FIG. 2, the detecting means 10 is installed at the lower end of the rear end portion of the desk 1 so that it can always detect the seated person 5 sitting on the chair 4 from the front. It is slidable in the width direction of the desk 1 according to the sitting position. The detecting means 10 is arranged at a predetermined angle θ so that light can be projected toward the normal appearance zone α and the incorrect appearance zone β which are set on the coaxial line 16 extending obliquely above the desk 1 from the installation position of the detecting means 10. The angle is adjusted. In this embodiment, the normal appearance zone α and the incorrect appearance zone β are gradually bent forward from the position a of the head 9 when the seated person 5 takes a correct posture, and the head when the posture is slightly collapsed. The position b is set based on the position b of the part 9 and the position c of the head 9 when the seating posture becomes worse due to forward bending. It is within the range of the triangle surrounded by each of the straight lines 23, 24, and 25 extended from. Further, since the coaxial line 16 is set below the position of the head 9 of the occupant 5, the light emitted from the detection means 10 must cross both the normal appearance zone α and the incorrect appearance zone β. become. In this embodiment, the normal position zone α is defined as the position b of the head 9 of the seated person 5 to point a, but the entire range from point b including the point a to the rear is defined as the normal form zone α. May be set. The light projecting angle θ of the detecting means 10 can also be appropriately adjusted according to the height of the seated person 5's back.

As shown in FIG. 3, the detecting means 10 includes a light emitting section 14 and a light receiving section 15 for receiving the reflected light when the light emitted from the light emitting section 14 hits the object to be detected. The light emitting unit 14 and the light receiving unit 15 are arranged on the base line 17 with a predetermined distance L therebetween. The light emitting unit 14 includes an infrared light emitting element 18 such as an LED, and a light projecting lens 19 which is disposed in front of the infrared light emitting element 18 and converges and projects infrared light into a beam. The light receiving section 15 includes a light receiving element 20 arranged on a baseline 17 and a light receiving lens 21 arranged in front of the light receiving element 20. The light receiving element 20 is composed of a first light receiving element 20a and a second light receiving element 20b arranged in the direction of the base line 17, and the beam projected from the infrared light emitting element 18 through the light projecting lens 19 is The light is reflected by the object to be detected at an arbitrary position on the coaxial line 16, and the reflected light is received by the light receiving element 20 through the light receiving lens 21.

In this embodiment, the position of the object to be detected existing in the normal appearance zone α or the incorrect appearance zone β is detected as follows. That is, the intersections A, B and C of the straight lines 23, 24 and 25 defining the normal appearance zone α and the incorrect appearance zone β as shown in FIG. 2 and the coaxial line 16 and the coaxial lines shown in FIG. If the points A, B, and C on the line 16 are in a corresponding positional relationship, most of the reflected light from the object to be detected near the point A is received by the first light receiving element 20a, The reflected light from the detected object near the point B is received in the vicinity of the junction between the first light receiving element 20a and the second light receiving element 20b, and the reflected light from the detected object near the point C is Most of the light is received by the second light receiving element 20b. Therefore, when the infrared light beam hits the object to be detected in the normal appearance zone α, most of the reflected light at that time is received by the first light receiving element 20a, and also in the incorrect appearance zone β. When the infrared light beam hits the object to be detected at, the reflected light at that time is almost received by the second light receiving element 20b. FIG. 4 shows the characteristics of the amount of light received by the first light receiving element 20a and the second light receiving element 20b at the points A, B, and C described above. As can be seen from this figure, in the detection at the point A, most of the light is received by the first light receiving element 20a, so that the light quantity characteristic has a light quantity peak on the first light receiving element 20a side (curve A1). Further, in the detection at the point B, since the first light receiving element 20a and the second light receiving element 20b receive almost equal amounts of light, the light amount characteristic has a light amount peak between them (curve B1), and C Since light is almost received by the second light receiving element 20b in the detection at the point, the light quantity characteristic has a light quantity peak on the side of the second light receiving element 20b (curve C1).

The determination means compares the amount of light received by the first light receiving element 20a with the amount of light received by the second light receiving element 20b, and the detected object is detected as the normal form zone α based on the comparison value. It is determined whether or not it is in the illegal zone β. That is, when the seated person 5 is in the normal form zone α, the amount of light received by the first light receiving element 20a is larger than the amount of light received by the second light receiving element 20b. When the occupant 5 is in the illegal appearance zone β, on the other hand, when the occupant 5 is in the illegal appearance zone β, the amount of light received by the second light receiving element 20b is opposite to the above. Since it is larger than the amount of light received by the first light receiving element 20a, it is determined in this case that the user is in the illegality zone β. Incidentally, when the amount of light received by the first light receiving element 20a is the same as the amount of light received by the second light receiving element 20b, it is assumed that the seated person 5 is present at the point B on the coaxial line 16 and the illegal appearance zone β. Judge that it is within. Such a determination can be easily made, for example, by converting it into a current value or a voltage value corresponding to the amount of light received by each light receiving element and comparing these values directly or indirectly. Even when the occupant 5 is located farther than the point A on the coaxial line 16, the reflected light is received by the first light receiving element 20a. To be judged.

It is to be noted that the case where the seated person 5 is detected within the normal appearance zone α is determined as being in the normal appearance zone α, but even if the seated person 5 is within the normal appearance zone α, a book or the like is illegal. When the book is detected by the detecting means 10 when leaning against the person in the figure zone β and reading the book, the distance between the book and the eyes of the occupant 5 is too close, resulting in fatigue of the occupant 5. Therefore, in this case as well, it is determined that the image is in the illegal appearance zone β.

When it is determined that the image is in the illegal appearance zone β, the determination unit outputs an alarm command signal to the timer circuit 12. This alarm command signal is continuously output while the detected object is in the illegal appearance zone β, and the timer circuit 12 counts the duration of this alarm command signal. Then, when this continuation time exceeds a preset predetermined time, the timer circuit 12 outputs an alarm signal to the alarm generating means 13. The reason why the timer circuit 12 is provided in this way is to prevent the alarm from being issued even if the illegality zone β is temporarily entered.

The alarm generation means 13 is activated upon receiving an alarm generation signal output from the timer circuit 12, and issues some alarm to the seated person 5. Various means can be considered for this warning, for example, when the buzzer, chime, or synthetic voice is used for hearing, or when a warning lamp blinks to call the attention.

It should be noted that in the above embodiment, the range located on the detection means 10 side further than the point C on the coaxial line 16 is not defined as either the normal form zone or the incorrect form zone, but up to this range The seated occupant 5 does not lean forward to read or work. Conversely, even if the seated occupant 5 leans against and reads a book within this range, the seated occupant's 5 eyes are far away and tired. Since there is no sense, it is not necessary to issue an alarm when an object is detected within this range. Therefore, it is possible to set this range as the first normal appearance zone and set the normal appearance zone α in the above embodiment as the second normal appearance zone. In this case, the object to be detected existing in the first appearance zone can be detected by causing the second light receiving element 20b, which is formed to be slightly larger, to receive the reflected light, and the reflected light can be detected by the second light receiving element 20b. It is also possible to detect that the object to be detected is present in the first normal form zone when it is out of the light receiving element 20b and there is no light receiving amount. In the case of this example, the detection in the second normal appearance zone is judged by the same criteria as in the above embodiment.

[0017]

[Effect of the device]

 As described above, according to the desk alarm device of the present invention, the position of the detected object existing in the normal form zone or the irregular form zone is detected, and based on the detected position of the detected object. Since it is determined in which zone, it is possible to reliably capture the forward bending posture of the seated person existing in the improper appearance zone.

[Brief description of drawings]

FIG. 1 is a block diagram of an alarm device according to the present invention.

FIG. 2 is a diagram showing a relationship between an arrangement position of detection means and a normal appearance zone and an unauthorized appearance zone.

FIG. 3 is an explanatory diagram showing a position detecting method by a detecting means.

FIG. 4 is a diagram showing a characteristic curve of an amount of received light depending on a difference in detection position.

FIG. 5 is an explanatory diagram showing an example of a conventional desk alarm device.

FIG. 6 is a block diagram of the alarm device in FIG.

[Explanation of symbols]

 1 desk 5 seated person 10 detection means 11 determination means 12 timer circuit 13 alarm generation means 14 light emitting section 15 light receiving section 16 coaxial line α normal appearance zone β illegal appearance zone

Claims (5)

[Scope of utility model registration request] 1. A detection means is installed in the vicinity of the rear edge of a desk, and a normal figure zone and a false figure zone are set on a coaxial line extending diagonally upward of the desk from the detection means at a predetermined detection angle, and the detection is performed. Light is emitted from the light emitting portion of the means toward the normal appearance zone and the illegal appearance zone, and the light receiving portion of the detection means receives the reflected light from the detection object existing in any zone to detect the position of the detection object. At the same time, an alarm device for a desk is characterized in that when it is determined that the object to be detected is in the illegal zone based on the detection signal from the detection means, an alarm is issued from the alarm generation means. 2. The detecting means has an angle adjusting mechanism, and the predetermined detecting angle of the detecting means can be adjusted according to the change of the normal appearance zone and the incorrect appearance zone. The desk alarm device according to 1. 3. The illegal zone and the normal zone are set in this order from the detecting means side on a coaxial line extending obliquely above the desk from the detecting means at a predetermined detection angle. The desk alarm device according to 1. 4. A first normal appearance zone, an incorrect appearance zone, and a second normal appearance zone are set in this order from the detection means side on a coaxial line extending obliquely upward from the detection means at a predetermined detection angle to the desk. The desk alarm device according to claim 1, wherein the desk alarm device is provided. 5. The alarm generating means has a timer that starts counting at the same time when it is determined that there is an object to be detected in the illegal appearance zone, and the alarm is issued after the timer has counted for a predetermined time. The alarm device for a desk according to claim 1, wherein: