JP7574709B2 - Ultraviolet irradiation equipment - Google Patents

Description

An embodiment of the present invention relates to an ultraviolet irradiation device.

Conventionally, systems have been disclosed that turn a load on and off based on the results of detection by a human presence sensor or other sensors.

JP 2012-164570 A

Meanwhile, ultraviolet irradiation devices are known that sterilize viruses and bacteria on the surface of objects and in the air by irradiating them with ultraviolet light. There is a set upper limit to the amount of ultraviolet light that the human body can receive in a day, and for example, when using the above-mentioned ultraviolet irradiation device in a manned environment, it may be necessary to set conditions such as forcibly turning off the light source after a certain time has elapsed or changing the irradiation conditions depending on the distance from the object to be irradiated. For this reason, in the conventional technology, there is a demand for improving user convenience.

The problem that this invention aims to solve is to provide an ultraviolet irradiation device that can improve user convenience.

The ultraviolet irradiation device according to the embodiment includes an ultraviolet light source, a sensor unit, and a reception unit. The sensor unit has a light receiving unit that receives infrared light , and a light emitting unit that emits infrared light . When the light receiving unit receives an infrared signal from a terminal device, the reception unit receives control according to the received infrared signal. The sensor unit includes a distance sensor that measures the distance from the ultraviolet light source to the irradiation target when the light receiving unit receives reflected light of infrared light emitted from the light emitting unit. The reception unit receives settings for a lighting pattern of the ultraviolet light source according to the distance measured by the distance sensor.

The present invention provides an ultraviolet irradiation device that can improve user convenience.

FIG. 1 is a diagram illustrating an example of an ultraviolet irradiation system according to the first embodiment. FIG. 2 is a block diagram showing an example of the configuration of the ultraviolet ray irradiation system according to the first embodiment. FIG. 3 is a flowchart showing an example of the flow of irradiation control processing in the ultraviolet irradiation device according to the first embodiment. FIG. 4 is a block diagram showing an example of the configuration of an ultraviolet irradiating device according to a modified example of the first embodiment. FIG. 5 is a diagram illustrating an example of an ultraviolet ray irradiation device according to the second embodiment. FIG. 6 is a block diagram showing an example of the configuration of an ultraviolet irradiating device according to the second embodiment. FIG. 7 is a diagram illustrating an example of distance information.

The ultraviolet irradiation device according to the embodiment will be described below with reference to the drawings. Components having the same functions in the embodiments will be given the same reference numerals, and duplicated descriptions will be omitted. Note that the ultraviolet irradiation device described below is merely an example, and is not intended to limit the embodiment.

The ultraviolet irradiation device 1 according to the embodiment described below includes an ultraviolet light source 2, a sensor unit 10, and a reception unit 21. The sensor unit 10 has a light receiving unit 5 that receives infrared light. When the light receiving unit 5 receives an infrared signal from a terminal device 50, the reception unit 21 receives control according to the received infrared signal.

The reception unit 21 in the embodiment described below receives the setting of the time when the ultraviolet light source 2 starts to turn on.

The reception unit 21 in the embodiment described below receives the setting of the time when the ultraviolet light source 2 is turned off.

The reception unit 21 in the embodiment described below receives the setting of the time for which the ultraviolet light source 2 will remain lit.

The reception unit 21 in the embodiment described below receives the current time setting.

The sensor unit 10 according to the embodiment described below includes a distance sensor (third sensor 3A) that measures the distance from the ultraviolet light source 2 to the irradiation target. The reception unit 21 receives the setting of the lighting pattern of the ultraviolet light source 2 according to the distance measured by the distance sensor.

The ultraviolet irradiation device 1B according to the embodiment described below turns off the ultraviolet light source 2 when the distance to the irradiation target is equal to or less than a threshold value.

The reception unit 21 in the embodiment described below receives control in response to an infrared signal received by the light receiving unit 5 when the ultraviolet light source 2 is turned off.

[First embodiment]
(Configuration of ultraviolet irradiation system)
Fig. 1 is a diagram showing an example of an ultraviolet irradiation system according to a first embodiment. As shown in Fig. 1, the ultraviolet irradiation system 100 has an ultraviolet irradiation device 1 and a terminal device 50. The ultraviolet irradiation system 100 is a system that realizes sterilization and virus suppression of objects and spaces including structures in, for example, an unmanned or manned indoor environment. Fig. 1 shows the ultraviolet irradiation system 100 having one ultraviolet irradiation device 1, but the ultraviolet irradiation system 100 may have multiple ultraviolet irradiation devices 1 depending on the size of a target area.

The ultraviolet irradiation device 1 has an ultraviolet light source 2, a first sensor 3, a second sensor 6, and an alarm unit 7. The ultraviolet irradiation device 1 is used by being fixed to, for example, a ceiling or a wall surface.

The ultraviolet light source 2 has, for example, one or more excimer lamps and irradiates ultraviolet light. The ultraviolet light source 2 irradiates ultraviolet light having a wavelength of, for example, 200 to 230 nm. The ultraviolet light source 2 may be a light source other than an excimer lamp, such as an LED (Light Emitting Diode). In addition, a filter that blocks light other than a specific wavelength may be provided, and the light irradiated from the ultraviolet light source 2 may be output through the filter. The ultraviolet light source 2 may have a light-emitting element that can be adjusted.

The first sensor 3 has a light-emitting unit 4 and a light-receiving unit 5. The light-emitting unit 4 has a light-emitting element that emits infrared light. The light-receiving unit 5 receives reflected infrared light emitted from the light-emitting unit 4. The first sensor 3 is, for example, a proximity sensor that detects that a person has approached the ultraviolet light source 2. The first sensor 3 detects that a person has approached within a predetermined range, for example, within 1 m, of the ultraviolet light source 2. Furthermore, when the first sensor 3 detects that a person has approached within the predetermined range, the ultraviolet irradiation device 1 stops or interrupts the illumination of the ultraviolet light source 2 and turns off the ultraviolet light source 2.

The light receiving unit 5 can also receive an infrared signal transmitted from the terminal device 50. The first sensor 3 determines whether the infrared light received by the light receiving unit 5 is an infrared signal. When it is determined that the light receiving unit 5 has received an infrared signal from the terminal device 50, the ultraviolet irradiator 1 executes control according to the received infrared signal. Whether or not the signal is an infrared signal can be determined, for example, based on the presence or absence of a code signal. For example, when the light receiving unit 5 receives infrared light including a code signal, it determines that the received infrared light is an infrared signal. When the light receiving unit 5 receives infrared light not including a code signal, it determines that the received infrared light is not an infrared signal. The first sensor 3 may check the type of the code signal and determine that the infrared light received by the light receiving unit 5 is an infrared signal.

The second sensor 6 is, for example, a human presence sensor that detects the presence or absence of a person or animal in the area irradiated by the ultraviolet light source 2. The second sensor 6 can be, for example, an infrared sensor, an ultrasonic sensor, a visible light sensor, etc.

The notification unit 7 notifies information regarding the operating state of the ultraviolet irradiation device 1, the presence or absence of abnormalities, etc. The notification unit 7 has a first lamp 8 and a second lamp 9. The first lamp 8 has one or more light-emitting elements, and notifies the lighting status of the ultraviolet light source 2. For example, the first lamp 8 is turned on to notify that the ultraviolet light source 2 is on. Also, the first lamp 8 is turned off to notify that the ultraviolet light source 2 is off, for example.

The second lamp 9 has one or more light-emitting elements and indicates the operating status of the ultraviolet irradiation device 1. For example, the second lamp 9 indicates that the ultraviolet irradiation device 1 is in operation by lighting up. The second lamp 9 also indicates an abnormality in the ultraviolet irradiation device 1 by blinking, for example. The second lamp 9 may also indicate the need to replace the ultraviolet light source 2 by, for example, a difference in the emitted light color.

The information reported by the notification unit 7 is not limited to the above. The notification unit 7 may, for example, report the status of detection by the second sensor 6. The notification unit 7 may also report the lighting mode of the ultraviolet light source 2, which will be described later, by varying the illumination state of the first lamp 8 and/or the second lamp 9. The illumination state of the first lamp 8 and/or the second lamp 9 may include, for example, lighting colors and combinations thereof, blinking intervals, etc. Furthermore, the notification unit 7 may report the various information as described above, for example, by sound, etc.

The terminal device 50 is, for example, a terminal device owned by an administrator of the ultraviolet irradiation device 1 or a user who uses a facility in which the ultraviolet irradiation device 1 is installed. The terminal device 50 transmits operation information corresponding to a user's operation as an infrared signal. In addition, as the terminal device 50, for example, a portable remote controller that controls the on/off of the ultraviolet irradiation device 1 can be adopted. In addition, the terminal device 50 may be a portable terminal device such as a smartphone, tablet terminal, or laptop computer, or may be a remote controller fixed within the facility.

(Functional configuration of each device according to the embodiment)
The process executed by the ultraviolet irradiation device 1 described above will be described in detail with reference to Fig. 2 together with the configuration of each device included in the ultraviolet irradiation system 100 according to the embodiment. Fig. 2 is a block diagram showing an example of the configuration of the ultraviolet irradiation system according to the first embodiment. Note that the description of the contents described in Fig. 1 will be omitted or simplified as appropriate.

First, the configuration of the ultraviolet irradiation device 1 will be described. The ultraviolet irradiation device 1 according to this embodiment includes the ultraviolet light source 2 and the notification unit 7 described with reference to FIG. 1, a sensor unit 10, a control unit 20, a memory unit 30, and a timer 40.

The sensor unit 10 has the first sensor 3 and the second sensor 6 described with reference to FIG. 1. The sensor unit 10 outputs the detection result obtained by the first sensor 3 acting as a proximity sensor to the control unit 20. Furthermore, when the light receiving unit 5 (see FIG. 1) of the first sensor 3 receives an infrared signal from the terminal device 50, the sensor unit 10 outputs the received infrared signal to the control unit 20. Furthermore, the sensor unit 10 outputs the detection result obtained by the second sensor 6 acting as a human presence sensor to the control unit 20.

The control unit 20 has a reception unit 21, a sensor control unit 22, a lighting control unit 23, and an alarm control unit 24.

The control unit 20 has an internal memory for storing programs that define various processing procedures and required data, and executes various processes using these. The control unit 20 is implemented by a microcomputer or the like. The microcomputer is equipped with a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), and a storage device such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The ROM stores programs for controlling each part of the ultraviolet irradiation device 1 and applications for executing various processes. The microcomputer controls the ultraviolet irradiation device 1 and realizes various functions by the processor such as the CPU executing the programs and applications stored in the ROM. The RAM is used as a memory area required for the processor such as the CPU to execute calculations. The control unit 20 may also realize the control of the ultraviolet irradiation device 1 and various functions by reading programs stored in the storage unit 30 and executing the read programs.

The reception unit 21 receives control in response to the infrared signal received by the light receiving unit 5. When the light receiving unit 5 receives an infrared signal output from the terminal device 50, the reception unit 21 receives control in response to the infrared signal.

The reception unit 21, for example, receives a setting of the time when the ultraviolet light source 2 starts to light up. The reception unit 21 receives a setting of the time when the ultraviolet light source 2 continues to light up. When the reception unit 21 receives control related to the setting of the light-on start time and the light-on duration, the reception unit 21 executes a setting process based on the control received by the reception unit 21, and stores the setting information 32 in the memory unit 30. The reception unit 21 may also receive a setting of the time when the ultraviolet light source 2 turns off.

The reception unit 21 may receive a current time setting. When the infrared signal output from the terminal device 50 to the light receiving unit 5 contains information about the current time, the reception unit 21 can receive the current time setting. When the reception unit 21 receives the current time setting, the reception unit 21 sets the timer 40 based on the received current time. The timer 40 is, for example, an internal timer that the ultraviolet irradiation device 1 has, and is capable of measuring a predetermined time (for example, 24 hours).

The reception unit 21 may also receive an instruction to turn on/off the ultraviolet light source 2. The reception unit 21 may further receive an instruction to turn on/off the ultraviolet irradiation device 1.

The reception unit 21 may also receive control in response to an infrared signal received by the light receiving unit 5 when the ultraviolet light source 2 is turned off. This can reduce malfunction of the ultraviolet irradiation device 1 due to, for example, erroneous detection of an infrared signal.

The sensor control unit 22 controls the operation of the first sensor 3 and the second sensor 6 of the sensor unit 10. The sensor control unit 22 controls the on/off of the first sensor 3 and the second sensor 6. The sensor control unit 22 may also change the detection sensitivity of the first sensor 3 and/or the second sensor 6 as necessary.

The lighting control unit 23 controls the lighting of the ultraviolet light source 2. The lighting control unit 23 may, for example, refer to the setting information 32 stored in the memory unit 30 and turn on the ultraviolet light source 2 in a predetermined lighting pattern. The lighting pattern is, for example, lighting control that temporarily turns off the ultraviolet light source 2 that is turned on and turns it on intermittently. The lighting pattern is, for example, expressed as a combination of a regularly repeated lighting time (for example, 15 seconds) and a lighting off time (for example, 200 seconds). The lighting control unit 23 refers to the setting information 32 pre-stored in the memory unit 30 and turns on the ultraviolet light source 2 in a predetermined lighting pattern according to the conditions.

The lighting control unit 23 may also refer to the setting information 32 and timer 40 stored in the memory unit 30, for example, and turn on the ultraviolet light source 2 at a preset lighting start time. The lighting control unit 23 may also turn off the ultraviolet light source 2 at a preset lighting end time. The lighting control unit 23 may also refer to the setting information 32 stored in advance in the memory unit 30, and turn off the ultraviolet light source 2 after a predetermined time has elapsed.

Furthermore, when the reception unit 21 receives control to turn on/off the ultraviolet light source 2, the lighting control unit 23 turns the ultraviolet light source 2 on and off according to the received control content. Also, when the ultraviolet light source 2 is dimmable, the lighting control unit 23 may control the dimming rate of the ultraviolet light source 2 according to the control content received by the reception unit 21.

The notification control unit 24 controls notifications by the notification unit 7. The notification control unit 24 controls the first lamp 8 and the second lamp 9 of the notification unit 7. The notification control unit 24 refers to notification information 33 pre-stored in the memory unit 30, and operates the notification unit 7 in a manner corresponding to information on the operating state of the ultraviolet irradiation device 1, the presence or absence of an abnormality, etc.

The storage unit 30 stores programs for implementing various controls of the ultraviolet irradiation device 1. The storage unit 30 is implemented, for example, by a semiconductor memory element such as a random access memory (RAM) or a flash memory, or a storage device such as a hard disk or an optical disk. The storage unit 30 stores, for example, pattern information 31, setting information 32, and notification information 33.

Pattern information 31 is one or more preset lighting patterns. The ultraviolet irradiation device 1 can register the lighting patterns in the setting information 32 by associating the lighting patterns with the intended use, installation location, etc., from among the multiple lighting patterns.

The setting information 32 is information related to the lighting control of the ultraviolet light source 2. The setting information 32 may include, for example, the lighting start time, lighting end time or lighting duration, lighting mode, etc., of the ultraviolet light source 2.

The notification information 33 is information related to the notification control of the notification unit 7. In the notification information 33, for example, information related to the operating state of the ultraviolet irradiation device 1 and the presence or absence of an abnormality is registered in association with the notification mode by the notification unit 7.

Next, the configuration of the terminal device 50 will be described. The terminal device 50 has an operation unit 51, a timer unit 52, a transmitter unit 53, and a memory unit 54.

The operation unit 51 receives control instructions from the user for the ultraviolet irradiation device 1 of the ultraviolet irradiation system 100. For example, when the operation unit 51 receives from the user an instruction to turn on, turn off, or set/change the start time, duration, or end time of the ultraviolet light source 2 of the ultraviolet irradiation device 1, the operation unit 51 outputs a control instruction indicating the received setting/change of the turn on, turn off, start time, duration, or end time of the light to the ultraviolet irradiation device 1 via the transmission unit 53.

The clock unit 52 keeps track of the current time. The transmitter 53 transmits an infrared signal that corresponds the control instruction received by the operation unit 51 to the current time. The memory unit 54 stores programs for implementing various controls of the terminal device 50.

In this way, the ultraviolet irradiation device 1 includes a reception unit 21 that receives control according to the received infrared signal when the light receiving unit 5 that receives infrared rays receives an infrared signal from the terminal device 50. This can improve user convenience.

The terminal device 50 may have, for example, a display unit (not shown) that displays the operation content by the operation unit 51. The terminal device 50 may also have, for example, an operation control unit such as a touch panel in which the operation unit 51 and the display unit are integrated.

Next, the processing procedure executed by the ultraviolet irradiation device 1 according to the first embodiment will be described with reference to FIG. 3. FIG. 3 is a flowchart showing an example of the processing procedure executed by the ultraviolet irradiation device according to the first embodiment.

The light receiving unit 5 of the ultraviolet irradiation device 1 receives infrared rays (step S11). The first sensor 3 determines whether the light receiving unit 5 has received an infrared signal from the terminal device 50 (step S12). If the light receiving unit 5 has received an infrared signal (step S12, Yes), the acceptance unit 21 accepts control according to the received infrared signal (step S13) and repeats the processing from step S12 onwards.

If the light receiving unit 5 does not receive an infrared signal (step S12, No), the light receiving unit 5 continues to perform sensor detection using the first sensor 3, which is a proximity sensor (step S14), and the first sensor 3 determines whether it has detected proximity (step S15). If the first sensor 3 detects proximity (step S15, Yes), the reception unit 21 ends the illumination of the ultraviolet light source 2 via the lighting control unit 23 (step S16). Then, if the first sensor 3 does not detect proximity (step S15, No), the ultraviolet irradiation device 1 returns to step S12 and repeats the subsequent processes.

(Modification of the ultraviolet irradiation device according to the first embodiment)
Fig. 4 is a block diagram showing an example of the configuration of an ultraviolet irradiation device according to a modification of the first embodiment. As shown in Fig. 4, an ultraviolet irradiation device 1A according to this modification is different from the ultraviolet irradiation device 1 according to the first embodiment in that it has a clock 40a instead of the timer 40.

The clock 40a is, for example, a real-time clock. By having the clock 40a in the ultraviolet irradiation device 1A, for example, it becomes unnecessary to obtain the current time from the terminal device 50, thereby improving convenience.

Second Embodiment
Fig. 5 is a diagram illustrating an example of an ultraviolet ray irradiation device according to the second embodiment. Fig. 6 is a block diagram illustrating an example of a configuration of an ultraviolet ray irradiation device according to the second embodiment.

As shown in Figures 5 and 6, the ultraviolet irradiation device 1B according to the second embodiment differs from the ultraviolet irradiation device 1 according to the first embodiment in that it has a third sensor 3A instead of the first sensor 3 as a proximity sensor. The third sensor 3A is a distance sensor that measures the distance from the ultraviolet light source 2 to the irradiation target. The third sensor 3A can measure the distance, for example, by receiving reflected light from the irradiation target that is reflected by the irradiation target when infrared light is irradiated from the light-emitting unit 4A with the light-receiving unit 5A.

The distance to the irradiation target measured by the third sensor 3A can be used, for example, to set or change the lighting pattern of the ultraviolet light source 2. As shown in FIG. 6, the memory unit 30 of the ultraviolet irradiation device 1B stores distance information 34.

Figure 7 is a diagram showing an example of distance information. As shown in Figure 7, distance information 34 is associated with "distance to irradiation target" and "lighting pattern." "Distance to irradiation target" is the distance to the irradiation target measured by the third sensor 3A. "Lighting pattern" indicates a pattern ID that identifies one of the multiple lighting patterns stored in pattern information 31.

For example, if the distance to the irradiation target measured by the third sensor 3A is equal to or less than the threshold value α, the reception unit 21 refers to the distance information 34 and turns off the ultraviolet light source 2 via the lighting control unit 23. If the distance to the irradiation target measured by the third sensor 3A is equal to or greater than the threshold value β, the reception unit 21 refers to the distance information 34 and sets or changes the lighting pattern of the ultraviolet light source 2 to "0002" via the lighting control unit 23.

The irradiation target for which the distance is measured by the third sensor 3A may be, for example, an object or a person. When the irradiation target is an object, the third sensor 3A can be used, for example, for initial setting of the lighting pattern when the ultraviolet irradiation device 1B is installed. On the other hand, when the irradiation target is a person, the third sensor 3A can be used, for example, for stable management of the amount of ultraviolet exposure in a manned environment in the ultraviolet irradiation device 1B after installation.

[Other Modifications]
In the above-described embodiments, the ultraviolet light source 2 is turned off after the lighting duration has elapsed or at the lighting end time after the lighting start, but the ultraviolet light source 2 may continue to be turned on. In such a case, the ultraviolet irradiation device can be operated in an unmanned lighting mode in which the ultraviolet light source 2 is turned off when the second sensor 6 of the sensor unit 10 detects a person.

In addition, in each of the above-described embodiments, the sensor unit 10 has two sensors, but it may have three or more sensors. For example, the sensor unit 10 may have a first sensor 3, a second sensor 6, and a third sensor 3A.

As described above, the ultraviolet irradiation device 1 according to the embodiment includes an ultraviolet light source 2, a sensor unit 10, and a reception unit 21. The sensor unit 10 has a light receiving unit 5 that receives infrared light. When the light receiving unit 5 receives an infrared signal from the terminal device 50, the reception unit 21 receives control according to the received infrared signal. This can improve user convenience.

In addition, the reception unit 21 according to the embodiment receives the setting of the time when the ultraviolet light source 2 starts to turn on. This can improve the convenience for the user.

The reception unit 21 in the embodiment described below receives the setting of the time when the ultraviolet light source 2 is turned off. This can improve the convenience for the user.

The reception unit 21 in the embodiment described below receives the setting of the time for which the ultraviolet light source 2 will remain lit. This improves user convenience.

The reception unit 21 in the embodiment described below receives the setting of the current time. This can improve the convenience for the user.

The sensor unit 10 according to the embodiment described below includes a distance sensor (third sensor 3A) that measures the distance from the ultraviolet light source 2 to the irradiation target. The reception unit 21 receives the setting of the lighting pattern of the ultraviolet light source 2 according to the distance measured by the distance sensor. This can improve user convenience.

The ultraviolet irradiation device 1B according to the embodiment described below turns off the ultraviolet light source 2 when the distance to the irradiation target is equal to or less than a threshold value. This improves user convenience.

The reception unit 21 in the embodiment described below receives control in response to an infrared signal received by the light receiving unit 5 when the ultraviolet light source 2 is turned off. This reduces malfunction of the ultraviolet irradiation device 1 due to erroneous detection of an infrared signal, thereby improving user convenience.

Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims, as well as the scope and gist of the invention.

Reference Signs List 1 Ultraviolet irradiation device 2 Ultraviolet light source 3 First sensor 4 Light emitter 5 Light receiver 6 Second sensor 7 Notification unit 10 Sensor unit 20 Control unit 21 Reception unit 22 Sensor control unit 23 Illumination control unit 24 Notification control unit 30 Storage unit 31 Pattern information 32 Setting information 33 Notification information 34 Distance information 50 Terminal device 100 Ultraviolet irradiation system

Claims (7)

an ultraviolet light source;
a sensor unit having a light receiving unit that receives infrared rays and a light emitting unit that emits infrared rays ;
a reception unit that, when the light receiving unit receives an infrared signal from a terminal device, receives control corresponding to the received infrared signal;
Equipped with
the sensor unit includes a distance sensor that measures a distance from the ultraviolet light source to an irradiation target when the light receiving unit receives reflected light of the infrared ray emitted from the light emitting unit,
The reception unit receives a setting of a lighting pattern of the ultraviolet light source according to the distance measured by the distance sensor.
Ultraviolet irradiation device. The ultraviolet irradiating device according to claim 1 , wherein the reception unit receives a setting of a time when the ultraviolet light source starts to be turned on. The ultraviolet irradiating device according to claim 2 , wherein the reception unit receives a setting of a time at which the ultraviolet light source is to be turned off. The ultraviolet irradiating device according to claim 2 , wherein the reception unit receives a setting for a time period during which the ultraviolet light source continues to be turned on. 5. The ultraviolet irradiation device according to claim 2, wherein the reception unit receives a setting of a current time. 6. The ultraviolet irradiation device according to claim 1, wherein the ultraviolet light source is turned off when the distance to the irradiation target is equal to or less than a threshold value. The ultraviolet irradiating device according to claim 1 , wherein the reception unit receives control in response to the infrared signal received by the light receiving unit when the ultraviolet light source is turned off.

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