JP5762338B2 - Indoor visual environment control system - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor optical environment control system, and more particularly, to an indoor environment that controls the optical environment in a room part of a living room provided with a daylighting window to reduce energy consumption and improve an illumination environment. The present invention relates to a light visual environment control system.

  In Japan, most of the nighttime lighting in the room of a living room is a method (ceiling light) in which one or more lighting fixtures are installed on the ceiling in one room. ) It is done focusing only on the illuminance above. For this reason, only the “quantity” of light is considered, and little consideration has been given to the “quality” of light, so residents tend to seek excessive brightness or needlessly much. Currently, lighting equipment is turned on. Also, there is a small correlation between the light output irradiated indoors by the luminaire and the visual comfort felt by the occupant. For example, if the light output is large, the light output is too bright and the visual comfort is reversed. May be damaged, and power (exergy) will be excessively consumed.

  For this reason, as a new index reflecting the directionality of light by the lighting fixtures arranged in the space, the average value of the illuminance on the four vertical side surfaces of the virtual hexahedron is divided by the illuminance on the horizontal top surface. By using the vertical horizontal illuminance ratio (RVH), which is the calculated value, a lighting design method has been developed that enables nighttime lighting design that appropriately evaluates the brightness of the interior space of a living room such as a house. (For example, see Patent Document 1).

  In addition, in the time period from dawn to evening, when natural light can be taken, power consumption by lighting fixtures can be effectively suppressed by actively taking natural light into the indoor space of a living room. On the other hand, the illumination of only natural light is greatly influenced by the weather or the like. For this reason, a light control device has been developed that keeps the illuminance of combined light of natural light and light from artificial lighting (lighting fixture) constant (for example, see Patent Document 2). In the light control device of Patent Literature 2, when the output of the first sensor that measures the illuminance of natural light, the second sensor that measures the illuminance of combined light of natural light and artificial illumination, and the first sensor fluctuate The first control means for keeping the brightness inside the building constant by adjusting the illuminance of the artificial lighting.

JP 2011-233330 A Japanese Patent Laid-Open No. 11-255103

  However, in the light control device of Patent Document 2, natural light is guided to the ceiling back part of a living room such as a house through a duct so that the combined light of natural light and artificial lighting can be emitted from the ceiling toward the room. Since the illumination device is dimmed so that the illuminance is constant, it is difficult to perform illumination that appropriately evaluates the brightness of the indoor space, for example, at night when natural light cannot be collected. Further, since the light control device of Patent Document 2 does not have a function of blocking or suppressing natural light, for example, in a room in a living room such as a house, the natural light that is collected is too strong, for example, a resident or the like. If you feel dazzling, it is difficult to reduce this. Furthermore, since the natural light collected includes heat, it is necessary to consider the temperature environment of the indoor space due to natural light.

  INDUSTRIAL APPLICABILITY The present invention provides a room light that can effectively manage visual comfort and energy savings by managing the indoor visual environment of a room such as a house all day, not only at night but also in the daytime. The object is to provide a visual environment control system.

The present invention is an indoor optical environment control system that controls the indoor optical environment of a living room portion provided with a daylighting window on the outer wall surface, and is capable of reducing energy consumption and improving the illumination environment, An indoor illuminance sensor device installed at a predetermined location in the room, an outdoor illuminance sensor device installed at a predetermined location outdoors, an outdoor temperature measurement device installed at a predetermined location outdoors, and the lighting window are covered. A light-shielding opening and closing device that opens and closes the light-shielding member that can be opened and closed, and a wired or wireless connection to these devices, and based on information obtained from these devices, indoor lighting and the opening and closing of the light-shielding member The indoor illuminance sensor device is composed of five illuminance meters respectively provided on the hexahedral horizontal top surface portion and the four vertical side surface portions. Illuminance with vertical side Each of the control devices can measure, and when the illuminance measured by the outdoor illuminance sensor device falls below a predetermined value, the control device switches to the night illumination mode, and the illuminance measured by the outdoor illuminance sensor device is predetermined. When the temperature measured by the outdoor temperature measuring device falls below a predetermined value, the lighting priority mode is switched, and the illuminance measured by the outdoor illuminance sensor device exceeds the predetermined value, and the outdoor temperature measuring device. When the temperature measured by the above is higher than a predetermined value, the solar control mode is switched to the solar shading mode , and the control device measures the hexahedron measured by the indoor illuminance sensor device in the daylighting priority mode. when 4-way of the average value of the illuminance of the vertical side portion average vertical illuminance (E _V) exceeds a predetermined value, the light shielding portion Closing the, when the average vertical illuminance (E _V) is below a predetermined value, by providing indoor light visual environment control system for controlling to open the light shielding member, which has achieved the above objects It is.

Further, according to the indoor light vision environment control system of the present invention, the control device is configured to calculate an average illuminance value of the four vertical side surfaces of the hexahedron measured by the indoor illuminance sensor device in the daylighting priority mode. When the average vertical surface illuminance (E _V ) value exceeds 60 Lx, the light shielding member is closed, and when the average vertical surface illuminance (E _V ) value is less than 6 Lx, the light shielding member is opened. It is preferable to control so as to.

Furthermore, according to the indoor optical vision environment control system of the present invention, the control device is configured to calculate an average illuminance value of the four vertical side surfaces of the hexahedron measured by the indoor illuminance sensor device in the night illumination mode. The vertical vertical illuminance rate (RVH), which is a value obtained by dividing the average vertical plane illuminance (E _V ) by the illuminance (E _H ) of the horizontal top surface, is a predetermined value, and the average vertical plane illuminance (E _V ) is It is preferable to control indoor lighting so as to have a predetermined value.

Furthermore, according to the indoor optical vision environment control system of the present invention, the control device is configured to obtain an average of the illuminances of the four vertical side surfaces of the hexahedron measured by the indoor illuminance sensor device in the night illumination mode. The value of the vertical horizontal illuminance ratio (RVH), which is a value obtained by dividing the average vertical plane illuminance (E _V ) that is the value by the illuminance (E _H ) of the horizontal top surface portion, is 0.3 to 1.5, and the average vertical it is preferable that the value of the surface illuminance (E _V) to control the lighting in the room so that 6～60Lx.

  Further, according to the indoor light vision environment control system of the present invention, it is preferable that the control device performs control so as to close the light shielding member in the solar radiation shielding mode.

  According to the indoor optical environment control system of the present invention, the indoor optical environment in a living room, such as a house, is managed in total not only at night but also in the daytime, thereby reducing visual comfort and energy saving. Effectively.

It is explanatory drawing of the indoor optical visual environment control system which concerns on preferable one Embodiment of this invention. It is explanatory drawing of the indoor illumination intensity sensor apparatus each provided in the horizontal top | upper surface part of a hexahedron, and the four vertical side parts.

The indoor optical vision environment control system 10 according to a preferred embodiment of the present invention shown in FIG. 1 is used in, for example, a residential building, and the optical vision of a room 13 of a living room 13 in which a lighting window 12 is provided on an outer wall surface 11. The environment is managed not only at night but also in the daytime, so that it can be managed all day long so that visual comfort and energy saving can be achieved. That is, as described in JP 2011-233330 A, the indoor optical vision environment control system 10 of the present embodiment is provided with a virtual hexahedron at the center of the living room, for example, under a predetermined light environment. Measure the illuminances E _V1 , E _V2 , E _V3 , E _V4 , and E _H on each of the five surfaces excluding the bottom of the virtual hexahedron (see FIG. 2), and the average illuminance E _V = (E _V1 + E on the four vertical sides) _V2 + E _V3 + E _V4 ) / 4 The vertical vertical illuminance ratio (RVH) obtained by dividing the average vertical illuminance by 4 by the illuminance E _H on the horizontal top surface is used as a brightness indicator. As a result, it was found that a room with a light visual environment in which a feeling of brightness was appropriately evaluated and a suitable feeling of brightness was obtained can be formed, so that the illuminances E _V1 , E _V2 , E _V3 , E _V4, set the indoor illumination sensor device 14 which can measure the room to E _H This makes it possible to easily form a light vision environment in a room space at night, and in combination with this, the outdoor illuminance sensor device 15 installed outdoors or the outdoor temperature. By using the measuring device 16, the natural light taken into the room through the daylighting window 12 is controlled so that the indoor visual environment can be managed in total not only at night but also in the daytime.

  As shown in FIG. 1, the indoor optical environment control system 10 according to the present embodiment controls the indoor optical environment of the living room portion 13 in which the daylighting window 12 is provided on the outer wall surface 11 to reduce energy consumption. A control system capable of reducing and improving the lighting environment, an indoor illuminance sensor device 14 installed at a predetermined indoor location, an outdoor illuminance sensor device 15 installed at a predetermined outdoor location, and an outdoor An outdoor temperature measuring device 16 installed at a predetermined location, a light shielding opening / closing device 18 that opens and closes a light shielding member 17 that covers the lighting window 12 and that can be opened and closed, and these devices are connected by wire or wirelessly. Based on the information obtained from these devices, the control device 19 is configured to control indoor lighting and opening / closing of the light shielding member.

  As shown in FIG. 2, the indoor illuminance sensor device 14 includes four illuminance meters 21 provided on the horizontal top surface 20 a of the hexahedron 20 and the four vertical side surfaces 20 b, respectively. The control device 19 switches to the night illumination mode when the illuminance measured by the outdoor illuminance sensor device 15 falls below, for example, 5Lx as a predetermined value. When the illuminance measured by the outdoor illuminance sensor device 15 exceeds a predetermined value such as 5Lx and the temperature measured by the outdoor temperature measurement device 16 falls below a predetermined value such as 28 ° C., the lighting priority mode is switched. The illuminance measured by the outdoor illuminance sensor device 15 exceeds a predetermined value, for example, 5Lx, and the outdoor temperature measurement device 16 Measured temperature is adapted to switch to solar radiation shielding mode when exceeded example 28 ℃ as a predetermined value (see Table 1).

Moreover, in this embodiment, the control apparatus 19 is the average value of the illumination intensity of the four vertical side surface parts 20b of the hexahedron 20 measured by the indoor illumination sensor apparatus 14 as shown in Table 1 in the lighting priority mode. When a certain average vertical plane illuminance (E _V ) exceeds 60 Lx as a predetermined value, the light shielding member 17 is closed, and when the average vertical plane illuminance (E _V ) falls below a predetermined value, preferably below 6 Lx. Then, the light shielding member 17 is controlled to be opened.

Furthermore, in this embodiment, as shown in Table 1, the control device 19 is an average value of the illuminance of the four vertical side surfaces 20b of the hexahedron 20 measured by the indoor illuminance sensor device 14 in the night illumination mode. The vertical horizontal illuminance ratio (RVH), which is a value obtained by dividing a certain average vertical plane illuminance (E _V ) by the illuminance (E _H ) of the horizontal top surface portion 20a, is preferably 0.3 to 1.5 as a predetermined value, and so that the average vertical plane illuminance (E _V) is preferably a 6~60Lx as a predetermined value, controls the room lighting.

  Furthermore, in the present embodiment, the control device 19 controls the light shielding member 17 to be closed in the solar radiation shielding mode.

  In this embodiment, as shown in FIG. 1, as a living room portion 13 having a daylighting window 12 provided on the outer wall surface 11, for example, an upper lighting fixture capable of dimming in a living room having a size of about 10 tatami mats, for example, upper A light 22a is provided and a reading light 22b is provided. The upper light 22a contributes as “atmosphere lighting” mainly for the purpose of creating an atmosphere in the room floor space, and the reading light 22b is mainly used for the purpose of reading and writing characters. It contributes as lighting. These indoor lighting fixtures can be switched on and off by a control signal from the control device 19 having a microchip by being connected to the control device 19 preferably wirelessly. In addition, the irradiated light output can be adjusted as appropriate.

  In addition, instead of or in addition to the upper light 22a and the reading lamp 22b, various lighting fixtures such as a ceiling light, a stand light, a floor light, and an indirect lighting can be used as a dimmable indoor lighting fixture. It is also possible to appropriately select an installation location where an effect can be obtained and install it in the living room portion 11. The light source by these indoor lighting fixtures can also be LEDs that are considered to have low power consumption.

  Moreover, in this embodiment, the table | surface arrange | positioned in the center part of a living room is a typical position suitable for evaluating the feeling of brightness in the living room part 11, as a predetermined location where the indoor illumination sensor device 14 is installed, for example. An indoor illuminance sensor device 14 is provided on 23. As shown in FIG. 2, the indoor illuminance sensor device 14 preferably has a regular hexahedron-shaped box as a hexahedron 20, and five illuminance meters 21 are connected to the horizontal top surface 20 a of the hexahedron 20 by the box and the four sides. It is comprised by attaching in the state which faced each vertical side part 20b. Accordingly, the five illuminance meters 21 can measure the illuminances of the horizontal top surface portion 20a and the four vertical side surface portions 20b of the hexahedron 20, respectively. The indoor illuminance sensor device 14 is preferably wirelessly connected to the control device 19 so that the data measured by the illuminometer 21 can be appropriately transmitted to the control device 19 having a microchip.

  It should be noted that the hexahedron 20 forming the horizontal top surface 20a and the four vertical side surfaces 20b whose illuminance is measured by the five illuminometers 21 does not necessarily have to be a hexahedral box, for example, a virtual By attaching the five illuminance meters 21 using various support members so that the illuminance meters 21 are respectively arranged facing the horizontal top surface portion 20a and the vertical side surface portion 20b of the hexahedron 20, these illuminance meters 21 Can be used as the indoor illuminance sensor device 14 in such a manner that the illuminance sensor device faces the horizontal top surface portion 20a and the four vertical side surface portions 20b of the virtual hexahedron 20 respectively. As the illuminometer 21, for example, various known illuminometers including a photo IC diode can be used.

  Further, in the present embodiment, as shown in FIG. 1, a lighting window 12 is provided on the outer wall surface 11 of the living room section 13, and the lighting window 12 is preferably covered from the indoor side, and is preferably a curtain / blind. However, the light shielding member 17 is provided so as to be openable and closable. The light shielding member 17 is connected to, for example, an opening / closing control motor as the light shielding opening / closing device 18, and this opening / closing control motor 18 is preferably connected wirelessly to the control device 19. With this control signal, the opening and closing of the curtain and the opening and closing of the slats can be controlled. In addition, as the light shielding member 17 provided so as to be able to be opened and closed covering the daylighting window 12, various known publicly known light shielding members such as a roll screen, a lattice door, a shoji, and a shutter are used in addition to a curtain and a blind. be able to.

  As the outdoor illuminance sensor device 15 installed outdoors, various known illuminance sensors capable of measuring outdoor illuminance can be used. Similar to the indoor illuminance sensor device 14, an illuminance sensor that can measure the illuminances of the hexahedral horizontal top surface and the four vertical side surfaces can also be used. The outdoor illuminance sensor device 15 is preferably wirelessly connected to the control device 19 so that outdoor illuminance measurement data can be appropriately transmitted to the control device 19 including a microchip.

  As the outdoor temperature measuring device 16 installed outdoors, various known thermometers capable of measuring the outside air temperature can be used. The outdoor temperature measuring device 16 is preferably wirelessly connected to the control device 19 so that the outdoor temperature measurement data can be appropriately transmitted to the control device 19 including a microchip.

  In the present embodiment, the control device 19 is, for example, a remote controller including a microchip having a microcomputer function, and includes a sensor information accumulation unit 19a and a dimming control unit 19b as shown in FIG. The The sensor information accumulation unit 19a is connected to the indoor illuminance sensor device 14, the outdoor illuminance sensor device 15 and the outdoor temperature measurement device 16, preferably wirelessly, so that the illuminance and the outside temperature sent from these devices are measured. Accumulate data. The dimming control unit 19b performs various calculations based on measurement data and the like accumulated in the sensor information accumulation unit 19a, and outputs a signal for controlling indoor lighting and the opening / closing of the light shielding member 17 by the indoor lighting fixtures 22a and 22b. By sending the light to the upper light 22a, the reading light 22b, and the open / close control motor 18, the indoor light viewing environment of the living room 13 is controlled including the brightness of natural light taken in from the daylighting window 12.

  In the present embodiment, the control device 19 includes measurement data sent from the indoor illuminance sensor device 14, the outdoor illuminance sensor device 15, the outdoor temperature measurement device 16, etc., various calculation results, vertical horizontal illuminance rate (RVH), and the like. Is displayed, and the measurement data and the calculation result can be appropriately confirmed. The control device 19 is wirelessly connected to a power meter attached in the middle of the wiring to the upper light 22a and the reading light 22b, and can display the power consumption by these lighting fixtures on the display unit. It is like that. Further, in the present embodiment, the control device 19 is a portable type control device, and a resident or the like can operate the control device 19 while sitting on the sofa 24, for example. ing. Furthermore, in the present embodiment, the control device 19 can switch between automatic control and manual control. For example, natural light can be collected by switching to manual control, for example, from dawn to evening. Even in the time period up to, for example, by closing the light-shielding member 17 so that natural light does not enter from the daylighting window 12, a night vision mode can provide a light vision environment that can provide a moderate brightness feeling in the indoor space It becomes possible to form.

  And according to the indoor optical vision environment control system 10 of this embodiment provided with the above-mentioned structure, as shown in Table 1, for example, the illuminance measured by the outdoor illuminance sensor device 15 falls below 5 Lx as a predetermined value, for example. In this case, the control device 19 can determine that it is nighttime when natural light cannot be taken in, and can set the control mode to switch to the nighttime illumination mode. As a result, it is possible to form a light visual environment excellent in visual comfort and energy saving in an indoor space, in which a moderate brightness can be obtained in the night time zone.

Here, in the night illumination mode, for example, from the experimental result described in the specification of Japanese Patent Application No. 2011-82496 relating to the application of the present applicant, the vertical horizontal illuminance ratio (RVH) is set to 0.3 to 1.5. In addition, by setting the average vertical surface illuminance (E _V ) to 6 to 60 Lx, it is possible to perform a lighting design that appropriately evaluates the feeling of brightness in the living room and obtains a suitable feeling of brightness. As a result, the RVH is 0.3 to 1.5 as a predetermined value of the vertical horizontal illuminance ratio (RVH), and the average vertical surface illuminance is a predetermined value of the average vertical surface illuminance (E _V ). It is preferable to set so that indoor lighting by the indoor lighting fixtures 22a and 22b is controlled so that (E _V ) is 6 to 60 Lx.

  For example, when the illuminance measured by the outdoor illuminance sensor device 15 exceeds a predetermined value, for example, 5Lx, and the temperature measured by the outdoor temperature measurement device 16 falls below a predetermined value, for example, 28 ° C., for example, The control mode can be set to switch to the daylighting priority mode by determining that it is the daytime of the season or time zone in which natural light is preferably taken as needed, except during the hot summer season. This makes it possible to create an efficient optical environment that effectively uses natural light in the indoor space, and to effectively reduce the energy for heating by the heat of natural light taken into the room. Is possible.

Here, in daylighting priority mode, for example, the resident often sees the direction of the wall, and the qualitative brightness perceived through the occupant's field of view is the illuminance on the horizontal plane. From the fact that it is considered more appropriate to indicate the illuminance on the vertical plane rather than the size of the above, and from the experimental results described in the specification of the above-mentioned Japanese Patent Application No. 2011-82496, the average vertical illuminance (E _V ) is 6 with ～60Lx, since it has appropriately evaluate the brightness sensation of the room unit, that the better brightness sensation is possible to perform lighting design obtained was found, the average vertical illuminance (E _V as a predetermined value of), when the average vertical illuminance (E _V) is above the 60Lx example, set so as to avoid the chamber becoming too bright, the light shielding member 17 is closed (curtains closed · slats closed) and tail . As also the predetermined value of average vertical illuminance (E _V), when the average vertical illuminance (E _V) is below a 6Lx example, in order to avoid the room is too dark, the light shielding member 17 is opened Set (curtains open / slats open) .

  Further, for example, when the illuminance measured by the outdoor illuminance sensor device 15 exceeds a predetermined value, for example, 5 Lx, and the temperature measured by the outdoor temperature measurement device 16 exceeds a predetermined value, for example, 28 ° C., for example, The control mode can be set to switch to the solar shading mode, judging that it is a hot summer season or daytime in the time zone. As a result, the light shielding member 17 is controlled to be closed (curtain closed / slat closed), so that it is possible to effectively avoid that the indoor light viewing environment is excessively dazzled by natural light, and also natural light. It is possible to effectively reduce the energy for cooling by shutting off the heat caused by.

  Thus, according to the indoor optical environment control system 10 of the present embodiment, the indoor optical environment of the living room portion 13 such as a house is managed in total, not only at night but also in the daytime. Comfort and energy saving can be effectively achieved.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, for switching the night illumination mode or lighting priority mode and solar shading mode, etc., outdoor illumination, outside air temperature, the vertical horizontal illuminance ratio (RVH), a predetermined value such as the average vertical illuminance (E _V), the above embodiments It is not limited to the value of the form, and can be appropriately set according to the season, time zone, regional characteristics, resident preference, and the like.

DESCRIPTION OF SYMBOLS 10 Indoor light visual environment control system 11 Outer wall surface 12 Daylighting window 13 Living room part 14 Indoor illuminance sensor apparatus 15 Outdoor illuminance sensor apparatus 16 Outdoor temperature measurement apparatus 17 Light-shielding member 18 Light-shielding switchgear 19 Control apparatus 19a Sensor information integration part 19b Light control Unit 20 Hexahedron 20a Horizontal top surface portion 20b Vertical side surface portion 21 Illuminance meter 22a Upper light (indoor lighting device)
22b Reading light (indoor lighting)

Claims (5)

An indoor optical environment control system that controls the indoor optical environment of a living room portion provided with a daylighting window on the outer wall so as to reduce energy consumption and improve the lighting environment.
An indoor illuminance sensor device installed at a predetermined location in the room, an outdoor illuminance sensor device installed at a predetermined location outdoors, an outdoor temperature measurement device installed at a predetermined location outdoors, and the lighting window are covered. A light-shielding opening and closing device that opens and closes the light-shielding member that can be opened and closed, and a wired or wireless connection to these devices, and based on information obtained from these devices, indoor lighting and the opening and closing of the light-shielding member And a control device for controlling the
The indoor illuminance sensor device can measure the illuminance at the horizontal top surface portion and the four vertical side surface portions by means of five illuminance meters respectively provided on the hexahedral horizontal top surface portion and the four vertical side surface portions. And
The control device switches to the night illumination mode when the illuminance measured by the outdoor illuminance sensor device falls below a predetermined value, the illuminance measured by the outdoor illuminance sensor device exceeds the predetermined value, and the outdoor temperature measuring device When the temperature measured by the temperature falls below a predetermined value, the mode switches to daylighting priority mode, the illuminance measured by the outdoor illuminance sensor device exceeds the predetermined value, and the temperature measured by the outdoor temperature measurement device is a predetermined value. When it exceeds, it will switch to solar shading mode ,
And said control device, in the lighting priority mode, the measured by the indoor illumination sensor device, which is the average value of the illuminance of the vertical side portion average vertical illuminance (E _V) is a predetermined value of four sides of the hexahedron when exceeded, the light shielding member closes, when the average vertical illuminance (E _V) is below a predetermined value, the indoor light visual environment control system for controlling to open the light shielding member. In the daylighting priority mode, the control device has an average vertical surface illuminance (E _V ) value of 60 Lx, which is an average value of the illuminance of the four vertical side surfaces of the hexahedron measured by the indoor illuminance sensor device. The indoor light vision environment control according to claim 1 , wherein when the value exceeds, the light shielding member is closed, and when the value of average vertical plane illuminance (E _V ) falls below 6 Lx, the light shielding member is controlled to be opened. system. Said controller, in the nighttime illumination mode, the measured by the indoor illumination sensor device, wherein an average value of the illuminance of the vertical side portion of the 4-way hexahedral average vertical illuminance (E _V) of the horizontal top surface is a value obtained by dividing the illuminance (E _H), claims the vertical horizontal illuminance ratio (RVH) becomes a predetermined value, and an average vertical illuminance (E _V) controls the illumination of the room to a predetermined value The indoor optical visual environment control system according to 1 or 2 . Said controller, in the nighttime illumination mode, the measured by the indoor illumination sensor device, wherein an average value of the illuminance of the vertical side portion of the 4-way hexahedral average vertical illuminance (E _V) of the horizontal top surface The value of the vertical horizontal illuminance ratio (RVH), which is the value divided by the illuminance (E _H ), is 0.3 to 1.5, and the average vertical plane illuminance (E _V ) is 6 to 60 Lx. 4. The indoor optical environment control system according to claim 3, which controls indoor lighting. The indoor light vision environment control system according to any one of claims 1 to 4 , wherein the control device controls the light shielding member to be closed in the solar radiation shielding mode.

Images