WO2015198375A1 - 照明装置 - Google Patents
照明装置 Download PDFInfo
- Publication number
- WO2015198375A1 WO2015198375A1 PCT/JP2014/066550 JP2014066550W WO2015198375A1 WO 2015198375 A1 WO2015198375 A1 WO 2015198375A1 JP 2014066550 W JP2014066550 W JP 2014066550W WO 2015198375 A1 WO2015198375 A1 WO 2015198375A1
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- WIPO (PCT)
- Prior art keywords
- illuminance
- dimming rate
- light source
- time
- changes
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D29/00—Lighting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
- B60Q3/80—Circuits; Control arrangements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/16—Controlling the light source by timing means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Definitions
- the technology disclosed in this specification relates to a lighting device installed in a vehicle.
- Patent Document 1 discloses an illumination device including a light source.
- the illuminating device detects the brightness of the illumination area to be irradiated with light by the illuminating device, and calculates a difference between the detected brightness and a predetermined brightness. Then, the lighting device changes the dimming rate of the light source based on the calculated difference so that the illumination area has the predetermined brightness.
- the lighting device includes a light source, an external light sensor, and a control unit.
- the light source is installed inside the vehicle.
- the external light sensor detects the illuminance of light outside the vehicle.
- the control unit controls the light source so that the higher the illuminance detected by the external light sensor, the lower the dimming rate of the light source.
- the control unit maintains the dimming rate to maintain the dimming rate of the light source even if the illuminance changes from a low state to a high state after the illuminance change amount exceeds a predetermined value and until a predetermined period elapses. Execute control.
- the lighting device can suppress frequent changes in the dimming rate of the light source in a short period of time, and thus suppresses humans from frequently perceiving changes in the dimming rate. obtain.
- the control unit changes from a low illuminance state to a high state before the predetermined period elapses, and when the predetermined period elapses, the illuminance is a high state after the change.
- the lighting device can appropriately control the light source according to the illuminance of external light after a predetermined period has elapsed.
- the control unit performs dimming rate maintenance control from when the illuminance changes from a high state to a low state until the predetermined period elapses after the amount of change exceeds a predetermined value, and the illuminance is high from the low illuminance state. Even if the amount of change when changing to a state exceeds a predetermined value, the dimming rate maintaining control need not be executed. According to this configuration, the lighting device can appropriately control the light source according to the direction in which the illuminance changes.
- the control unit determines that the predetermined period from the first timing
- the dimming rate maintaining control is executed until the lapse of time, and the illuminance change amount is changed at the second timing before the predetermined period elapses after the illuminance change amount exceeds the predetermined value at the first timing.
- the dimming rate maintenance control is executed between the first timing and the second timing, and the dimming rate is between the second timing and the elapse of the predetermined period. Maintenance control may be executed.
- the illuminating device can perform dimming rate maintenance control over a suitable period.
- the control unit controls the light source so that the dimming rate is increased by a first value per unit time, and the illuminance changes from a low state to a high state.
- the light source may be controlled so that the dimming rate is lowered by a second value smaller than the first value per unit time. According to this configuration, the lighting device can appropriately control the change rate of the dimming rate of the light source in accordance with the direction in which the illuminance changes.
- control method a control method, a computer program, and a computer-readable recording medium for storing the computer program for realizing the lighting device are also novel and useful.
- the lighting device 10 is installed in a railway vehicle (hereinafter referred to as “vehicle”).
- the illumination device 10 includes an external light sensor 12, a light source 14, and a control unit 30.
- the external light sensor 12 detects the illuminance of light outside the vehicle and outputs an external light signal indicating the illuminance to the control unit 30.
- the light source 14 is installed inside the vehicle.
- the light source 14 is, for example, an LED (abbreviation of light emitting diode) lamp, a fluorescent lamp, a high-pressure discharge lamp, or the like.
- the control unit 30 controls the light source 14 in accordance with an external light signal input from the external light sensor 12. Specifically, the control unit 30 controls the light source 14 so that the dimming rate of the light source 14 decreases as the illuminance indicated by the external light signal increases. In other words, the control unit 30 controls the light source 14 so that the dimming rate of the light source 14 increases as the illuminance indicated by the external light signal decreases. In other words, the control unit 30 reduces the light control rate of the light source 14 to reduce the power consumption of the light source 14 in a situation where the interior of the vehicle is bright due to outside light, and the light source 14 in a situation where the interior of the vehicle is dark due to outside light. The light control rate of 14 is increased to brighten the interior of the vehicle.
- the dimming rate is an amount that defines the brightness of the light source 14, and the brightest state is 100%, and the darkest state (that is, the light source 14 is turned off) is 0%.
- the dimming rate can be paraphrased as follows.
- the dimming rate is the ratio of the actual luminous flux of the light source 14 to the maximum luminous flux (luminous flux; the unit is lm (lumen)) of the light source 14.
- luminous intensity unit: cd (candela)
- luminance luminance
- unit: cd / m 2 illuminance
- illuminance luminance; lx (lux)
- the luminous flux is substantially proportional to the amount of current (unit: A (ampere)) supplied to the light source 14. Therefore, for example, in practice, the dimming rate can be said to be the ratio of the amount of current actually supplied to the light source 14 to the maximum amount of current that can be supplied to the light source 14.
- the control unit 30 includes an external light change detection circuit 32, a dimming rate control circuit 34, and a driver circuit 36.
- the ambient light change detection circuit 32 calculates the amount of change in illuminance indicated by the ambient light signal.
- the outside light change detection circuit 32 calculates the amount of change in illuminance by calculating the differential coefficient of the outside light signal. That is, the change amount of illuminance is the change amount of illuminance in a predetermined minute period. Then, when the amount of change when the illuminance indicated by the external light signal changes from a high state to a low state exceeds a predetermined value, the external light change detection circuit 32 determines whether the predetermined period has elapsed after the change amount exceeds the predetermined value.
- a maintenance signal for maintaining the dimming rate of the light source 14 is output to the dimming rate control circuit 34.
- the external light change detection circuit 32 does not output a maintenance signal to the dimming rate control circuit 34 when the amount of change when the illuminance indicated by the external light signal changes from a low state to a high state exceeds a predetermined value. .
- the external light change detection circuit 32 includes a timer (not shown), and starts the timer when the output of the maintenance signal is started.
- the outside light change detection circuit 32 ends outputting the maintenance signal to the dimming rate control circuit 34 when the count value of the timer has passed a predetermined period (for example, 5 seconds).
- a predetermined period for example, 5 seconds.
- the external light change detection circuit 32 can output a maintenance signal to the dimming rate control circuit 34 after the change amount of the external light exceeds a predetermined value until a predetermined period elapses.
- the external light change detection circuit 32 resets the timer count value and restarts the timer if the change in illuminance exceeds the predetermined value again before the count value of the timer elapses. .
- the outside light change detection circuit 32 outputs a maintenance signal to the dimming rate control circuit 34 between the time when the amount of change in illuminance exceeds a predetermined value and the amount of change in illuminance exceeds the predetermined value again.
- a maintenance signal is output to the dimming rate control circuit 34 from when the illuminance change amount exceeds the predetermined value again until the predetermined period elapses.
- the dimming rate control circuit 34 outputs a dimming rate signal corresponding to the illuminance indicated by the external light signal to the driver circuit 36. Specifically, the dimming rate control circuit 34 outputs a dimming rate signal indicating a low dimming rate to the driver circuit 36 as the illuminance indicated by the external light signal is high, and the illuminance indicated by the external light signal is low. Then, a dimming rate signal indicating a high dimming rate is output to the driver circuit 36. However, the dimming rate control circuit 34 starts from the input of the maintenance signal from the external light change detection circuit 32 until the input of the maintenance signal ends, and the following (1) and (2) Execute the operation.
- the dimming rate control circuit 34 outputs a dimming rate signal for reducing the dimming rate of the light source 14 to the driver circuit 36 even when the illuminance indicated by the external light signal changes from a low state to a high state. Instead, a dimming rate signal for maintaining the dimming rate of the light source 14 is output to the driver circuit 36. In this way, since the dimming rate of the light source 14 is maintained, even if the illuminance of outside light changes frequently, for example, when the vehicle passes through a plurality of short tunnels continuously, the light source 14 It is possible to suppress the dimming rate of the light from changing frequently during a short period of time.
- the dimming rate control circuit 34 outputs a dimming rate signal for increasing the dimming rate of the light source 14 to the driver circuit 36 when the illuminance indicated by the external light signal changes from a high state to a low state. To do.
- the dimming rate control circuit 34 further outputs a dimming rate signal to the driver circuit 36 as follows. For example, when the vehicle enters the tunnel, the illuminance indicated by the external light signal changes rapidly from a high state to a low state. In this case, the dimming rate control circuit 34 follows a sudden change in illuminance indicated by the external light signal, and outputs a dimming rate signal indicating a low dimming rate, and then dimming indicating a high dimming rate. It changes at high speed to the state of outputting a rate signal. Thereby, immediately after the vehicle enters the tunnel, the dimming rate of the light source 14 can be instantaneously increased.
- the dimming rate control circuit 34 does not follow a sudden change in illuminance indicated by the external light signal, and outputs a dimming rate signal indicating a high dimming rate, without adjusting the dimming rate signal indicating a low dimming rate. It changes at low speed to the state of outputting the light rate signal. Thereby, immediately after a vehicle leaves a tunnel, it can suppress that the light control rate of the light source 14 falls rapidly. As a result, since it can suppress that a human perceives the change of the light control rate, it can suppress giving a human discomfort.
- the dimming rate control circuit 34 increases the dimming rate of the light source 14 by a first value per unit time (that is, high speed).
- the dimming rate of the light source 14 is smaller than the first value per unit time.
- the light source 14 is controlled so as to decrease by the value of (ie, change at a low speed).
- the driver circuit 36 controls the light source 14 in accordance with the dimming rate signal input from the dimming rate control circuit 34. Specifically, the driver circuit 36 controls the amount of current to be supplied to the light source 14 according to the dimming rate indicated by the dimming rate signal. That is, the driver circuit 36 increases the amount of current to be supplied to the light source 14 (that is, sets a high dimming rate) as the dimming rate indicated by the dimming rate signal increases, and the dimming rate signal indicates. The lower the light rate, the smaller the amount of current to be supplied to the light source 14 (that is, a lower light control rate is set).
- the light source 14 is controlled such that the higher the illuminance of external light is, the lower the dimming rate of the light source 14 is. For this reason, as shown in FIG. 2, the dimming rate of the light source 14 changes as follows according to the change in the amount of solar radiation. The amount of solar radiation changes gradually from daytime to nighttime. For this reason, the illuminance indicated by the external light signal gradually changes from a high state to a low state from daytime to nighttime.
- the external light change detection circuit 32 does not output a maintenance signal to the dimming rate control circuit 34 because the amount of change in illuminance does not exceed a predetermined value due to a gradual change in illuminance of external light. Therefore, the dimming rate control circuit 34 outputs a dimming rate signal corresponding to the illuminance indicated by the external light signal to the driver circuit 36. As a result, the driver circuit 36 responds to the dimming rate signal input from the dimming rate control circuit 34 so that the dimming rate gradually changes from a low state to a high state from daytime to nighttime. 14 is controlled.
- the dimming rate of the light source 14 changes from a low state to a high state at high speed from time t1 to time t2. Thereby, immediately after the vehicle enters the tunnel, the dimming rate of the light source 14 can be instantaneously increased.
- a value obtained by dividing the difference between the dimming rate at time t1 and the dimming rate at time t2 by the difference between time t1 and time t2 is an example of the “first value”.
- the differential coefficient is a negative value (that is, the illuminance indicated by the external light signal has changed from a high state to a low state), and the absolute value of the differential coefficient exceeds a predetermined value. Therefore, at time t1, the output of the maintenance signal is started and the timer count is started. Then, at time t3 when the count value of the timer has passed the predetermined period, the output of the maintenance signal is finished.
- the vehicle leaves the long tunnel. For this reason, the illuminance indicated by the external light signal changes rapidly from a low state to a high state. Since the maintenance signal is not output at time t4, the dimming rate of the light source 14 changes from a high state to a low state at a low speed from time t4 to time t5 according to the illuminance indicated by the external light signal. Thereby, immediately after a vehicle leaves a tunnel, it can suppress that the light control rate of the light source 14 falls rapidly.
- a value obtained by dividing the difference between the dimming rate at time t4 and the dimming rate at time t5 by the difference between time t4 and time t5 is an example of the “second value”.
- the differential coefficient is a positive value (that is, the illuminance of external light is changed from a low state to a high state). For this reason, the output of the maintenance signal is not started.
- the lighting device 10 changes the dimming rate of the light source 14 from a low state to a high state when the vehicle enters a long tunnel, and decreases the dimming rate of the light source 14 from a high state when the vehicle exits the tunnel. Change to state. Thereby, the illuminating device 10 can adjust the light control rate of the light source 14 appropriately according to the illumination intensity of external light.
- the state before time t10 is the same as the state before time t1 in FIG.
- the illuminance indicated by the external light signal changes rapidly from a high state to a low state. Therefore, the dimming rate of the light source 14 changes from a low state to a high state at high speed from time t10 to time t11.
- the change is the same as the change in the light control rate from time t1 to time t2 in FIG.
- the differential coefficient is a negative value, and the absolute value of the differential coefficient exceeds a predetermined value. Therefore, at time t10, the output of the sustain signal is started and the timer count is started.
- the illuminance indicated by the external light signal changes rapidly from a low state to a high state.
- the maintenance signal is output at time t12. For this reason, even if the illuminance indicated by the external light signal changes from a low state to a high state, the dimming rate of the light source 14 is maintained.
- the differential coefficient is a positive value, so the timer is not reset.
- the output of the maintenance signal is completed at time t13 when the count value of the timer has passed a predetermined period.
- the illuminance indicated by the external light signal changes from a low state to a high state at time t12, and the high state is maintained at time t13.
- the dimming rate of the light source 14 changes from a high state to a low state at a low speed from time t13 to time t14. This change is the same as the change in the light control rate from time t4 to time t5 in FIG.
- the vehicle passes through a short tunnel.
- the time from when the vehicle enters the tunnel until it exits is short.
- the dimming rate of the light source 14 changes at each of the time t10 when the vehicle enters the tunnel and the time t12 when the vehicle exits, the human can frequently perceive the change in the dimming rate in a short period of time.
- the lighting device 10 maintains the dimming rate of the light source 14 even when the illuminance of outside light changes from a low state to a high state at time t12 when the vehicle leaves the tunnel.
- it can be suppressed that a human frequently perceives a change in dimming rate in a short period of time.
- since it is possible to suppress human perception of so-called light flickering it is possible to suppress giving discomfort to humans.
- the illuminance indicated by the external light signal changes rapidly from a low state to a high state.
- the maintenance signal is output at the time t22. For this reason, even if the illuminance indicated by the external light signal changes from a low state to a high state, the dimming rate of the light source 14 is maintained.
- the differential coefficient is a positive value, so the timer is not reset.
- the illuminance indicated by the external light signal rapidly changes from a high state to a low state.
- the differential coefficient is a negative number, and the absolute value of the differential coefficient exceeds a predetermined value. For this reason, at time t23, the count value of the timer is reset, and the count of the timer is restarted.
- the illuminance indicated by the external light signal changes rapidly from a low state to a high state.
- the maintenance signal is output at the time t24. For this reason, the light control rate of the light source 14 is maintained.
- the differential coefficient is a positive value, so the timer is not reset.
- the output of the maintenance signal ends.
- the illuminance indicated by the external light signal changes from a low state to a high state at time t24, and the high state is maintained at time t25. For this reason, the dimming rate of the light source 14 changes from a high state to a low state at a low speed from time t25 to time t26.
- FIG. 6 a lighting device of a comparative example will be described with reference to FIG.
- the configuration (not shown) of the illumination device of the comparative example is the same as that of the illumination device 10 of the present embodiment except that the external light change detection circuit 32 is not provided.
- the vehicle in which the lighting device of the comparative example is installed passes through two short tunnels as in the case C of FIG. 5.
- the maintenance signal is not output. For this reason, the light control rate of the light source 14 increases from time t30 to time t31 when the vehicle enters the first tunnel, and the light source 14 adjusts from time t32 to time t33 when the vehicle exits the first tunnel. The light rate is lowered. Further, the light control rate of the light source 14 increases from time t33 to time t34 when the vehicle enters the second tunnel, and the light control rate of the light source 14 from time t35 to time t36 when the vehicle exits the second tunnel. Becomes lower.
- the lighting device 10 adjusts the light source 14 even when the illuminance of outside light changes from a low state to a high state at time t22 when the vehicle leaves the first tunnel. Maintain rate. Moreover, since the dimming rate of the light source 14 is maintained in a high state, the lighting device 10 does not change the dimming rate of the light source 14 even at time t23 when the vehicle enters the second tunnel. For this reason, it can suppress that a human perceives the change of the light control rate frequently in a short time. As a result, since it is possible to suppress human perception of so-called light flickering, it is possible to suppress giving discomfort to humans.
- the “vehicle” is a railway vehicle.
- the “vehicle” may be another vehicle such as a normal car or a bus.
- the absolute value of the differential coefficient when the illuminance of outside light changes from a high state to a low state exceeds a predetermined value.
- a maintenance signal is output until a predetermined period elapses (for example, between times t1 and t3 in FIG. 3), and the illuminance of outside light changes from a low state to a high state (hereinafter referred to as “second case”).
- the predetermined value of the differential coefficient exceeds the predetermined value (for example, at time t4), the sustain signal is not output.
- the maintenance signal may be output in both the first case and the second case. In this case, for example, in case C of FIG.
- a maintenance signal is output between times t20 and t24, and a predetermined period from time t24 is reached.
- a maintenance signal is output until the time has elapsed.
- a configuration may be employed in which the maintenance signal is not output in the first case, but the maintenance signal is output in the second case. In this case, for example, in case C of FIG. 5, the maintenance signal is not output at time t20, but the maintenance signal is output at time t22. For this reason, even if the illuminance of external light changes from a low state to a high state at time t22, the dimming rate of the light source 14 is maintained in a high state.
- the maintenance signal is output, and as a result, the dimming rate of the light source 14 is maintained in a high state.
- the “light control rate maintenance control” may be executed after the amount of change in illuminance exceeds a predetermined value until the predetermined period elapses.
- Modification 3 In the above-described embodiment, when the illuminance indicated by the external light signal suddenly changes from a high state to a low state, the illumination device 10 rapidly changes from a low dimming rate to a high state.
- the light source 14 is controlled so as to change at (for example, times t1 to t2 in FIG. 3).
- the lighting device 10 changes the light source 14 so that the dimming rate of the light source 14 changes from a high state to a low state at a low speed. Control (for example, time t4 to t5).
- the illumination device 10 changes so that the dimming rate of the light source 14 is rapidly changed from a high state to a low state even when the illuminance indicated by the external light signal is rapidly changed from a low state to a high state.
- the light source 14 may be controlled. That is, for example, in FIG. 3, the absolute value of the slope of the dimming rate between time t1 and time t2 (that is, the “first value” above) and the dimming rate between time t4 and time t5. May be equal to the absolute value of the slope (ie, the “second value” above).
- the control unit 30 of the lighting apparatus 10 includes hardware 32 to 36 such as logic circuits, and the hardware 32 to 36 perform the above operations (for example, FIG. 3 to FIG. 5 cases) are realized.
- the control unit 30 may include a CPU and a memory that stores a program. In this case, each operation described above may be realized by the CPU executing processing according to the program in the memory.
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- Mechanical Engineering (AREA)
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- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
Abstract
Description
(照明装置10の構成;図1)
図1を参照して、照明装置10の構成を説明する。照明装置10は、鉄道車両(以下では「車両」と呼ぶ)に設置される。照明装置10は、外光センサ12と、光源14と、制御部30と、を備える。外光センサ12は、車両の外部の光の照度を検出して、当該照度を示す外光信号を制御部30に出力する。光源14は、車両の内部に設置される。光源14は、例えば、LED(Light Emitting Diodeの略)ランプ、蛍光ランプ、高圧放電ランプ等である。
上述したように、照明装置10では、外光の照度が高い程、光源14の調光率が低くなるように、光源14が制御される。このために、図2に示されるように、日射量の変化に応じて、以下のように光源14の調光率が変化する。日射量は、日中から夜間にかけて緩やかに変化する。このため、外光信号が示す照度は、日中から夜間にかけて、高い状態から低い状態へ緩やかに変化する。外光変化検出回路32は、外光の照度が緩やかに変化することに起因して照度の変化量が所定値を超えないので、維持信号を調光率制御回路34に出力しない。従って、調光率制御回路34は、外光信号が示す照度に応じた調光率信号をドライバ回路36に出力する。この結果、ドライバ回路36は、調光率制御回路34から入力される調光率信号に応じて、日中から夜間にかけて、調光率が低い状態から高い状態へ緩やかに変化するように、光源14を制御する。
続いて、図3を参照して、車両が長いトンネルを通過するケースAについて説明する。時刻t1以前では、車両は、トンネル外を走行している。そのため、時刻t1以前では、外光信号が示す照度は比較的に高い。従って、光源14の調光率は比較的に低い。また、時刻t1以前では、外光の照度がほぼ一定であるので、照度の変化量(即ち微分係数の絶対値)が所定値を超えない。このために、時刻t1以前では、維持信号が出力されない。なお、維持信号のグラフは、時刻t1以前のようにレベルが低い状態では、維持信号が出力されていないことを示し、時刻t2のようにレベルが高い状態では、維持信号が出力されていることを示す。
続いて、図4を参照して、車両が1個の短いトンネルを通過するケースBについて説明する。なお、本実施例では、車両がトンネルを通過することを想定しているが、例えば、車両が木又はビルの近傍を通過する場合にも、同様の事象が起こる。この点は、後述の図5でも同様である。
続いて、図5を参照して、車両が2個の短いトンネルを通過するケースCについて説明する。時刻t20以前の状態は、図3の時刻t1以前の状態と同様である。時刻t20では、車両が1個目のトンネル内に入るので、外光信号が示す照度は、高い状態から低い状態へ急激に変化する。従って、光源14の調光率は、時刻t20から時刻t21にかけて、低い状態から高い状態へ高速で変化する。また、時刻t20において、維持信号の出力が開始され、タイマーのカウントがスタートされる。
続いて、図6を参照して、比較例の照明装置について説明する。比較例の照明装置の構成(図示省略)は、外光変化検出回路32を備えていないことを除き、本実施例の照明装置10と同様の構成である。図6では、比較例の照明装置が設置される車両は、図5のケースCと同様に、2個の短いトンネルを通過する。
上述したように、図5のケースC及び図6の比較例では、車両が2個の短いトンネルを通過する。この場合、車両が各トンネルに入ってから出るまでの時間が短い。また、2個のトンネルの間の間隔が短い。この場合、車両が1個目のトンネルを出てから2個目のトンネルに入るまでの時間が短い。従って、図6の比較例の構成では、車両が各トンネルに入る時刻t30,t33と出る時刻t32,t35とのそれぞれで光源14の調光率が変化するので、ヒトが短期間に調光率の変化を頻繁に知覚し得る。これに対し、図5のケースCでは、照明装置10は、車両が1個目のトンネルを出る時刻t22において、外光の照度が低い状態から高い状態へ変化しても、光源14の調光率を維持する。しかも、光源14の調光率が高い状態で維持されるので、照明装置10は、車両が2個目のトンネルに入る時刻t23においても、光源14の調光率を変化させない。このために、ヒトが短期間の間に調光率の変化を頻繁に知覚するのを抑制し得る。この結果、ヒトがいわゆる光のちらつきを知覚するのを抑制し得るので、ヒトに不快感を与えるのを抑制し得る。
Claims (5)
- 車両に設置される照明装置であって、
前記車両の内部に設置される光源と、
前記車両の外部の光の照度を検出する外光センサと、
前記外光センサによって検出される前記照度が高い程、前記光源の調光率が低くなるように、前記光源を制御する制御部と、を備え、
前記制御部は、前記照度の変化量が所定値を超えてから所定期間が経過するまでの間に、前記照度が低い状態から高い状態へ変化しても、前記光源の前記調光率を維持する調光率維持制御を実行する、照明装置。 - 前記制御部は、前記所定期間が経過するまでの間に、前記照度が低い状態から高い状態へ変化し、かつ、前記所定期間が経過する際に、前記照度が変化後の高い状態である場合に、前記光源の前記調光率が低くなるように、前記光源を制御する、請求項1に記載の照明装置。
- 前記制御部は、
前記照度が高い状態から低い状態へ変化する場合の前記変化量が前記所定値を超えてから前記所定期間が経過するまでの間に、前記調光率維持制御を実行し、
前記照度が低い状態から高い状態へ変化する場合の前記変化量が前記所定値を超えても、前記調光率維持制御を実行しない、請求項1又は2に記載の照明装置。 - 前記制御部は、
前記照度の前記変化量が第1のタイミングで前記所定値を超えてから前記所定期間が経過する前に、前記照度の前記変化量が前記所定値を再び超えない場合に、前記第1のタイミングから前記所定期間が経過するまでの間に、前記調光率維持制御を実行し、
前記照度の前記変化量が第1のタイミングで前記所定値を超えてから前記所定期間が経過する前に、前記照度の前記変化量が第2のタイミングで前記所定値を再び超える場合に、前記第1のタイミングから前記第2のタイミングまでの間に、前記調光率維持制御を実行すると共に、前記第2のタイミングから前記所定期間が経過するまでの間に、前記調光率維持制御を実行する、請求項1から3のいずれか一項に記載の照明装置。 - 前記制御部は、
前記照度が高い状態から低い状態へ変化する場合に、前記調光率が単位時間当たり第1の値だけ高くなるように、前記光源を制御し、
前記照度が低い状態から高い状態へ変化する場合に、前記調光率が単位時間当たり前記第1の値よりも小さい前記第2の値だけ低くなるように、前記光源を制御する、請求項1から4のいずれか一項に記載の照明装置。
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CA2953299A CA2953299C (en) | 2014-06-23 | 2014-06-23 | Lighting device |
JP2016528769A JP6222357B2 (ja) | 2014-06-23 | 2014-06-23 | 照明装置 |
PCT/JP2014/066550 WO2015198375A1 (ja) | 2014-06-23 | 2014-06-23 | 照明装置 |
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DE102017203018A1 (de) | 2017-02-24 | 2018-08-30 | Siemens Aktiengesellschaft | Anordnung zur Beleuchtung eines Schienenfahrzeuges und Schienenfahrzeug |
CN108995511B (zh) * | 2018-07-27 | 2021-09-24 | 京东方科技集团股份有限公司 | 车辆驾驶遮光装置、车辆及车辆驾驶遮光的方法 |
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JPH0761283A (ja) * | 1993-08-27 | 1995-03-07 | Koito Ind Ltd | 客室灯制御システム |
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US9884634B2 (en) | 2018-02-06 |
CA2953299A1 (en) | 2015-12-30 |
CA2953299C (en) | 2019-05-21 |
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