JP2010078363A - Awakening system and awakening method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an awakening system and an awakening method which attains a comfortable awakening. <P>SOLUTION: The awakening system 1 is installed in a vehicle 2 to be used and includes: a camera 10 for photographing a face image of an occupant 4; a light source 20 for awakening the occupant 4 by emitting light to an eye of the occupant 4; a navigation system 30; and a control ECU 40. The control ECU 40 measures the degree of opening of an eyelid from the face image photographed by the camera 10 and reduces the brightness of the light emitted by the light source 20 when the eyelid opens. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an awakening device and an awakening method for comfortably waking up a subject.

  Conventionally, as a technique for awakening a sleeping subject comfortably (awakening from sleep), for example, an air conditioner, a lighting, a curtain, etc. are operated according to the wake-up time to promote the awakening of the subject. Proposed.

In addition, as a device that promotes awakening mounted on a vehicle, for example, a control device for a vehicle awakening illumination device mounted on a vehicle has been proposed (see Patent Document 1). In this apparatus, the apparatus operates at a timing when the passenger of the vehicle needs to wake up, and wakes up the passenger by irradiating the passenger with light.
JP 2006-27534 A

  In the above-described device, even when the sleeping passenger is awakened by light irradiation, the passenger is irradiated with the same light as before the awakening. Therefore, even if the passenger wakes up and opens his eyes, the bright light to wake up enters the eyes and feels uncomfortable when it is too bright, or the afterimage of the light burns into the eyes and feels strange That happened.

  In this way, the conventional technology for promoting awakening by stimulating the target person is when the time when it is necessary to wake up or when the vehicle has moved to a specific range, etc. It was just to activate the lighting and other devices. For this reason, even if the subject wakes up, the same operation as that in the state where the subject is not awakened is performed. There was a problem of feeling pleasant.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a wake-up device and a wake-up method that realize a comfortable wake-up.

  The invention according to claim 1, which has been made to solve the above-described problem, comprises: awakening means for waking up the subject person; means for detecting the awakening state of the subject person; and means for controlling the operation of the means for waking up. It is an awakening device. And according to the detected awakening state of the subject, the operation of the awakening means is controlled.

  In the awakening device configured as described above, the operation of the awakening means can be made in accordance with the awakening state of the target person, so that it is not possible to receive the same stimulus from the awakening means before and after awakening. Pleasant feeling can be reduced and comfortable awakening can be realized.

  The specific configuration of the awakening means is not particularly limited as long as it can provide a stimulus for awakening the subject. For example, the structure which utters a sound to a subject or shakes a subject can be considered, and it is good to comprise so that those operation | movement may be adjusted according to an arousal state.

  In addition to the above, it is conceivable to configure the wake-up device according to claim 2. In the wake-up device according to claim 1, the wake-up means is a light source device that irradiates light to the subject. And a subject's arousal state is detected based on the opening degree of a subject's eyelid, and the light quantity which reaches | attains a subject's eyes is adjusted according to the awakening state.

  With the awakening device configured in this manner, the subject can be awakened by irradiating light, and the amount of light corresponding to the awakened state reaches the eyes, so that the subject is uncomfortable. Can be reduced.

  In order to adjust the amount of light reaching the eyes of the subject, the following two methods are conceivable. The 1st is the structure which adjusts the light quantity of the light which a light source device irradiates according to the awakening state of a subject like the awakening apparatus of Claim 3.

The second configuration is a configuration in which the irradiation direction of the light emitted from the light source device is changed according to the awakening state of the subject as in the awakening device according to claim 4.
If it is the structure of such Claim 3 or Claim 4, the light quantity of the light which reaches | attains a subject's eyes can be adjusted easily.

  In addition, the specific method of measuring the opening degree of the eyelid is not particularly limited. For example, as in the awakening device of claim 5. It is good also as measuring the opening degree of a subject's eyelid based on the picture which photoed the field containing the subject's eyes.

  With the awakening device configured in this way, it is not necessary to attach a sensor or the like to the subject's body in order to measure the eyelid opening of the subject, so that the subject can feel uncomfortable by attaching the sensor or the like. Giving can be suppressed.

  By the way, as a specific policy for adjusting the amount of light, the amount of the light reaching the subject decreases as the degree of opening of the subject's eyelid increases as in the awakening device according to claim 6. You may comprise as follows.

  With the wake-up device configured in this way, the amount of light increases when the eyelid before the subject wakes up or when the eyelid opening is small, and when the subject wakes up and the eyelid opens The amount of light decreases. Therefore, it is possible to reduce the subject from receiving discomfort by irradiating strong light even though the subject is awake.

  Further, as in the wake-up device according to claim 7, when the opening of the eyelid of the subject increases to a predetermined opening, the light irradiation by the light source device is stopped. It is no longer possible to irradiate light in a state where the subject is awakened, and it is possible to suppress discomfort by irradiating the subject's eyes with light. Further, it is possible to eliminate the trouble of the subject performing an operation for stopping the light irradiation by the light source device.

  In addition, since the size of the eyes and the opening degree of the eyelid at the time of awakening vary among individuals, it is convenient to set the predetermined opening degree described above for each subject. For this purpose, as in the wakeful device according to claim 8, the structure includes storage means for storing the opening degree of the eyelid in the awake state of the subject person, and is based on the opening degree of the eyelid stored in the storage means. The predetermined opening may be determined.

With the awakening device configured as described above, it is possible to appropriately determine that the subject has been awakened without being affected by individual differences in eyelid opening at the time of awakening.
The invention according to claim 9 is the awakening device according to any one of claims 2 to 8, comprising a means for acquiring the illuminance around the subject, and based on the acquired illuminance, The amount of light emitted from the light source device is adjusted.

With the awakening device configured in this way, control according to the surrounding environment can be performed.
The invention described in claim 10 is the wake-up device according to any one of claims 2 to 9, wherein the light source device emits light having directivity.

With the awakening device configured as described above, the irradiation destination of light can be limited, so that it is possible to reduce discomfort to surrounding people by irradiating light around the subject.
By the way, each wake-up device described above may be configured to operate at any timing. For example, it may be configured to operate immediately when the subject is not awakened, or may be configured to operate when a predetermined time has elapsed since the subject is not awakened.

  Further, as a configuration other than the above, as in the wakeful device according to claim 11, a condition setting unit that sets a condition for the wakeup unit to operate, and whether or not a condition set by the condition setting unit is satisfied And a determination unit that determines whether the awakening unit is activated when the determination unit determines that the above-described condition is satisfied.

With the awakening device configured as described above, the awakening device operates under the conditions set by the subject, so that the subject can wake up at a desired timing.
In addition, each awakening apparatus mentioned above is mounted in a vehicle and used like the awakening apparatus of Claim 12, It is good also as awakening the passenger of a vehicle as an object person.

With the awakening device configured as described above, it is possible to comfortably awaken the passenger of the vehicle.
The invention according to claim 13 is an awakening method for waking up a subject using an awakening means. It is characterized by detecting the awakening state of the subject and controlling the operation of the awakening means in accordance with the detected awakening state of the subject.

With such an awakening method, the subject can be comfortably awakened as in the case of using the awakening device according to claim 1.
In the awakening method, as the awakening means, it is conceivable to use a light source device that irradiates light to the subject as described in claim 14. In that case, the awakening state of the subject is detected based on the opening degree of the eyelid of the subject, and the operation of the light source device is controlled according to the detected awakening state of the subject, It is advisable to adjust the amount of light that arrives.

With such a wake-up method, the same effect as when the wake-up device according to claim 2 is used can be obtained.
In the awakening method described above, the following two methods are conceivable for adjusting the amount of light reaching the eyes of the subject. The first is a method of adjusting the amount of light emitted from the light source device, as in the awakening method according to claim 15.

The second is a method of changing the irradiation direction of the light emitted from the light source device, as in the awakening method according to claim 16.
With such an awakening method according to claim 15 or claim 16, the amount of light reaching the eyes of the subject can be easily adjusted.

Embodiments of the present invention will be described below with reference to the drawings.
[Example]
(1) Overall Configuration A top perspective view of the awakening system 1 in the present embodiment is shown in FIG. 1 (a), and a side perspective view is shown in FIG. 1 (b). A block diagram of the awakening system 1 is shown in FIG.

  The awakening system 1 is used by being mounted on a vehicle 2, and as shown in FIGS. 1A and 1B, in front of each seat 3 (left direction in FIGS. 1A and 1B). The camera 10 and the light source device 20 disposed in the vehicle, the navigation system 30 disposed on the dashboard, the control ECU 40, and the solar radiation sensor 50.

  Among these, the camera 10 shoots a face image of the occupant 4 and is arranged toward the occupant 4 in the front direction of the occupant 4 in the vehicle 2. More specifically, the camera 10 for photographing the passenger 4 in the driver seat and the passenger seat is arranged on the dashboard of the vehicle 2, and the camera 10 for photographing the passenger 4 in the rear seat is the driver seat and the passenger seat. It is arranged behind the seat. These cameras 10 are configured to take a face image of the front of the passenger 4 at predetermined time intervals and sequentially transmit image data indicating the taken face image to the control ECU 40.

  The light source device 20 irradiates the passenger 4 with light to wake up the passenger 4, and includes a lighting circuit 22, a light source 24, a driving unit 26 that drives a reflecting member (not shown), and the like. The lighting circuit 22 lights the light source 24 in accordance with an input signal from the control ECU 40. The light source 24 uses an LED bulb having directivity, and is configured to be able to change the luminance of light by PWM control. The light emitted from the light source 24 is reflected by the reflecting member and reaches the face of the passenger 4.

  The drive unit 26 moves the destination of the light irradiated by the light source 24 by driving the reflection member described above. The reflecting member is arranged in such a positional relationship that the light emitted from the light source 24 reaches the vicinity of the face of the passenger 4 in advance, and the destination of the light moves within a predetermined range by driving the reflecting member by the driving unit 26. To do.

  The navigation system 30 includes a control device 31 that controls the entire navigation system 30, a position detection device 32 including a GPS receiver, a gyroscope, a vehicle speed sensor, a storage device 34 that stores map data, a map display image, and the like. The device includes a display device 36 for displaying various images, an input device 38 for inputting various instructions by the passenger 4, and performs map display processing, route guidance processing, and the like, and also has a clock function. Yes.

  In the map display process, the current position of the vehicle is calculated based on each detection signal from the position detection device 32, and a map or the like near the current position is displayed on the display device 36 based on the map data stored in the storage device 34. It is processing to do. Further, the route guidance process calculates a destination route which is an optimum route from the current position to the destination set by the passenger based on the map data stored in the storage device 34, and calculates the current position and the destination. This is a process of performing travel guidance to the destination in consideration of the relationship with the ground route. At this time, the estimated arrival time at the destination is also calculated at regular intervals.

  The above-described display device 36 is configured to display not only the image display of the map display process and the route guidance process described above but also the image display in the input operation of the awakening system 1 or the like. The input device 38 is configured to accept not only the navigation system 30 but also the input operation of the awakening system 1.

  The control ECU 40 is mainly configured by a known microcomputer including a CPU 42, a ROM 44, a RAM 46, an input / output interface 48 (I / O 48), and a bus line connecting these components.

  The control ECU 40 executes an awakening control process, an irradiation setting process, etc., which will be described later, in accordance with an application program read from the ROM 44 and various data stored in the RAM 46. The control ECU 40 stores the image data in the RAM 46 every time the image data is received from the camera 10. Then, based on the image data, the eyelid opening is measured in an awakening control process to be described later.

The control ECU 40 is connected to the solar radiation sensor 50. This solar radiation sensor 50 is arrange | positioned on the dashboard which the sunlight of the inside of the vehicle 2 reaches | attains, and measures illumination intensity.
(2) Processing by Control ECU 40 Hereinafter, various processing executed by the control ECU 40 will be described.
(2.1) Awakening Control Process A processing procedure of the awakening control process will be described with reference to FIG. This awakening control process is started when an operation for starting this process is performed on the input device 38 of the navigation system 30.

  In this awakening control process, first, the eyelid opening degree of the passenger 4 is measured (S1). The measurement of the opening degree of the eyelid is realized by specifying a region indicating the eye in the image data indicating the face image taken by the camera 10 and measuring the height thereof. More specifically, for example, the technique described in Japanese Patent Laid-Open No. 7-313459 can be used.

  Next, the first eyelid opening measured in S1 is stored in the RAM 46 (S2). The eyelid opening stored here is stored as the eyelid opening in the awake state of the occupant 4 and is used to determine that the occupant 4 has awakened in S12 described later.

  Next, an awakening condition is set (S3). Here, a condition for causing the light source device 20 to start an operation of irradiating the passenger 4 with light to wake the passenger 4 is input to the passenger 4. A screen shown in FIG. 4A is displayed on the display device 36 of the navigation system 30. The passenger 4 selects whether the condition is determined based on the destination of the vehicle 2 or the time.

  When the destination is selected, after the destination (place name, facility name, position on the map, etc.) is set on the destination setting screen (not shown), the vehicle 2 is displayed on the time setting screen shown in FIG. It is input how many hours (minutes) before the set destination is reached to activate the light source device 20 (irradiate light). When the time is selected, the time for operating the light source device 20 is input on the time setting screen shown in FIG.

The selection and input are accepted by the input device 38. The input information is stored in the RAM 46, and is used to determine whether or not the awakening condition is satisfied in S5 described later.
Next, information indicating the estimated arrival time at the destination or the current time is acquired from the navigation system 30 (S4).

  Next, the information acquired in S4 and the information stored in the RAM 46 in S3 are compared to determine whether or not the wake-up condition is satisfied (S5). Specifically, it is determined that the condition is satisfied when the interval between the estimated arrival time at the destination and the current time is equal to or less than the set time, or when the current time is after the set time. If the awakening condition is not satisfied (S5: No), the process returns to S4.

  On the other hand, if the awakening condition is satisfied (S5: Yes), an irradiation setting process is performed (S6). In this irradiation setting process, the amount of light reaching the eyes of the passenger 4 is adjusted by setting the brightness of the light emitted from the light source device 20. Details of this irradiation setting process will be described later.

Next, irradiation of light to the passenger 4 is started (S7).
Next, the eyelid opening degree of the passenger 4 is measured (S8). Here, the eyelid opening is measured using a method similar to the measurement of the eyelid opening by S1. As a result of this measurement, if the eyelid opening degree is 0, that is, if the eyelid is closed (S9: Yes), the process returns to S8.

  On the other hand, if the opening degree of the eyelid is not 0, that is, if the eyelid is open even a little (S9: No), brightness adjustment is performed (S10). Here, the brightness of light emitted from the light source device 20 is adjusted. FIG. 5A schematically shows changes in luminance. In FIG. 5A, the vertical axis represents luminance and the horizontal axis represents the progress of this process.

  A in the figure is the timing at which light irradiation is started in S7, B is the timing when the eyelid is closed in S9 (that is, S9: Yes), and C is the first. This is the timing when the brightness adjustment is started in S10, and D is the timing when it is determined that the passenger 4 is awake in S12 (that is, S12: Yes).

  The brightness of the light emitted from the light source device 20 is initially lower than a predetermined maximum (between A and B). However, when the eyelid is closed, the brightness is increased to promote awakening. Increasing (brightness between BC). When the eyelid starts to open, the brightness decreases as the degree of opening increases (the brightness between C and D). In S10, the luminance adjustment between CDs is performed. Specifically, in S9 or S11 described later, the luminance is changed so that the luminance decreases as the eyelid opening increases in accordance with the eyelid opening measured in the last executed step.

  FIG. 5A shows an example of a change in luminance. In the drawing, A to D are positions indicating processing stages, and therefore, the intervals are not necessarily as shown in FIG. Further, since the luminance between C and D changes with the change in the eyelid opening, it does not always become linear as shown in FIG. If it is not determined that the eyelid is closed in S9 and the process proceeds to S10, the brightness adjustment between B and C is skipped and the C stage is reached. An example of the change in luminance at that time is shown in FIG.

  Furthermore, in this S10, the irradiation destination of light is moved according to the opening degree of the eyelid. Specifically, as the eyelid opening increases, the drive unit 26 is operated so that the light irradiation destination is positioned away from the eyes of the passenger 4.

Next, the eyelid opening degree of the passenger 4 is measured (S11). Here, the eyelid opening is measured using a method similar to the measurement of the eyelid opening by S1.
Next, it is determined whether or not the eyelid opening measured in S11 is equal to or smaller than a predetermined opening (S12). The predetermined opening is a value obtained by multiplying the value by α (α ≦ 1) with the eyelid opening measured in S1 as a reference. As a result of this determination, if the eyelid opening is equal to or smaller than the predetermined opening (S12: Yes), the process returns to S10.

On the other hand, if the opening degree of the eyelid is equal to or greater than the predetermined opening degree (S12: No), the light irradiation by the light source device 20 is stopped (S13), and this process is terminated.
(2.2) Irradiation setting process The process procedure of an irradiation setting process is demonstrated based on FIG. This irradiation setting process is started in S6 of the awakening control process.

  In this irradiation setting process, first, the measured value of the solar radiation sensor 50 is read (S21). Next, based on the measurement value read in S21, it is determined whether or not the present is daytime (S22).

  If it is determined in S22 that it is daytime (S22: Yes), daytime luminance is set (S23). Here, the luminance of the light source 24 is set to a luminance higher than the luminance setting for night described later. Thereafter, this process ends.

On the other hand, when it is not determined as daytime in S22 (S22: No), the luminance setting for night is set (S24). Here, the brightness of the light source 24 is set to a brightness lower than the above-described daytime brightness setting. Thereafter, this process ends.
(3) Effect In the awakening system 1 configured as described above, the luminance of light increases when the eyelid is closed, and the luminance of light decreases as the eyelid opens. Further, as the eyelid opens, the light irradiation destination moves to a position away from the eyes.

  Therefore, when the passenger 4 is not awakened, the passenger 4 receives a strong light to promote awakening, and when the eyelids are awakened and the eyelids are opened, the light is weakened, and the passenger 4 receives an uncomfortable feeling such as burning the eyes. Disappears. Therefore, the passenger 4 can realize a comfortable awakening.

  Further, in the awakening system 1, since the eyelid opening is measured using the camera 10, a sensor or the like needs to be attached to the body of the passenger 4 in order to measure the eyelid opening of the passenger 4. Therefore, it is possible to suppress discomfort to the passenger 4 by attaching a sensor or the like.

  Moreover, since the irradiation of light is stopped when the eyelid of the passenger 4 reaches a predetermined opening, it is possible to prevent the passenger 4 from irradiating the eyes with light and to suppress discomfort, and to irradiate the light from the light source device 20. It is possible to eliminate the trouble of the passenger 4 performing an operation for stopping the vehicle.

  Furthermore, since the predetermined opening degree of the eyelid is determined from the opening degree of the eyelid when the occupant 4 is awakened, the occupant 4 is awakened without being affected by individual differences in the eyelid opening degree at the time of awakening 4. Can be determined appropriately.

  Further, the daylight and nighttime are judged by the solar radiation sensor 50, and the brightness of the light is adjusted accordingly, so that problems such as receiving too much light at night and too weak light radiating in the daytime may occur. Can be suppressed.

Moreover, since the awakening system 1 starts the light irradiation operation in accordance with the conditions set by the passenger 4, the passenger 4 can wake up at a desired timing.
Moreover, since the awakening system 1 uses the light source 24 with high directivity, it is possible to reduce discomfort to surrounding people by irradiating light around the subject. Especially at night, when the interior of the vehicle 2 becomes brighter, the driver's visibility becomes worse. However, with the above configuration, such a problem is less likely to occur.
(4) Modifications Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various forms can be taken as long as they belong to the technical scope of the present invention. Not too long.

  For example, in the above-described embodiment, the configuration using the light source device 20 that irradiates light to wake up the occupant 4 is exemplified, but the configuration may be used to wake up the occupant 4 using other devices. For example, a configuration in which a device that generates sound, a device that vibrates the seat 3 or operates a part of the seat 3, etc. may be used as the awakening device that awakens the passenger 4. In that case, what is necessary is just to control operation | movement of an awakening apparatus according to the awakening state of the passenger 4. FIG. In the flow of the awakening control process, the processes of S1, S2, and S6 are eliminated, the operation of the awakening apparatus is started in S7, and the operation of the awakening apparatus is controlled so that the stimulus to the passenger 4 is reduced in S10, and S13 The operation of the awakening device may be stopped at

  Moreover, in the said Example, although the structure which uses the light source 24 with high directivity was illustrated, you may use a fluorescent lamp, a light bulb, etc. with low directivity. With this configuration, although light reaches other than the passenger 4, the burden on the eyes of the passenger 4 can be reduced.

Moreover, although the drive part 26 illustrated the structure which drives a reflection member in the said Example, the structure which changes the irradiation direction of light by displacing the light source 24 may be sufficient.
Moreover, in the said Example, although the drive part 26 illustrated the structure which operate | moves after an eyelid opens, the structure which drives the drive part 26 before an eyelid opens may be sufficient. For example, it is conceivable that the light irradiation destination is alternately moved between the eyes of the passenger 4 and other points so as to stimulate the passenger 4 to promote awakening.

Side view showing awakening system Block diagram showing the awakening system Flowchart showing processing procedure of waking control processing The figure which shows the screen which is shown on the display device Graph showing the relationship between brightness and arousal state Flow chart showing processing procedure of irradiation setting processing

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Awakening system, 2 ... Vehicle, 3 ... Seat, 4 ... Passenger, 10 ... Camera, 20 ... Light source device, 22 ... Lighting circuit, 24 ... Light source, 26 ... Drive part, 30 ... Navigation system, 31 ... Control device 32 ... Position detecting device, 34 ... Storage device, 36 ... Display device, 38 ... Input device, 40 ... Control ECU, 42 ... CPU, 44 ... ROM, 46 ... RAM, 48 ... Input / output interface, 50 ... Solar radiation sensor

Claims (16)

Awakening means to wake the subject,
Awakening detection means for detecting awakening state of the subject;
Control means for controlling the operation of the awakening means,
The control unit controls the operation of the wake-up unit according to the wake-up state of the subject detected by the wake-up detection unit. The awakening means is a light source device that irradiates light to the subject,
The awakening detection means detects the awakening state of the subject based on the eyelid opening of the subject.
2. The wake-up device according to claim 1, wherein the control unit adjusts the amount of the light reaching the eyes of the subject according to the wake-up state of the subject detected by the wake-up detection unit. . The wake-up device according to claim 2, wherein the control means adjusts the amount of light emitted from the light source device according to the wake-up state of the subject detected by the wake-up detection means. The said control means changes the irradiation direction of the light which the said light source device irradiates according to the awakening state of the said subject detected by the said awakening detection means. The Claim 2 or Claim 3 characterized by the above-mentioned. Awakening device. The said arousal detection means measures the opening degree of the eyelid of the said subject based on the image which image | photographed the area | region containing the said subject's eyes. Awakening device. The wake-up device according to any one of claims 2 to 5, wherein the control means reduces the amount of the light reaching the subject as the eyelid opening of the subject increases. . The said control means stops irradiation of the light by the said light source device, when the opening degree of the eyelid of the said subject becomes large and becomes a predetermined opening degree. The awakening device according to any one of the above. Comprising storage means for storing the eyelid opening in the awake state of the subject,
The wake-up device according to claim 7, wherein the predetermined opening degree is determined based on an eyelid opening degree stored in the storage means. Illuminance information acquisition means for acquiring the illuminance around the subject,
The awakening according to any one of claims 2 to 8, wherein the control means adjusts the amount of light emitted by the light source device based on the illuminance acquired by the illuminance information acquisition means. apparatus. The awakening device according to any one of claims 2 to 9, wherein the light source device emits light having directivity. Condition setting means for setting conditions for the awakening means to operate;
Determination means for determining whether the condition set by the condition setting means is satisfied,
The wake-up device according to any one of claims 1 to 10, wherein the control means activates the wake-up means when the determination means determines that the condition is satisfied. The awakening device according to any one of claims 1 to 11, wherein the awakening device is used by being mounted on a vehicle and awakens a passenger of the vehicle as the subject. An awakening method for waking up a subject using an awakening means,
Detecting the awake state of the subject,
An awakening method comprising controlling the operation of the awakening means in accordance with the detected awakening state of the subject. The awakening means is a light source device that irradiates light to the subject,
The awake state of the subject is to be detected based on the eyelid opening of the subject,
The awakening method according to claim 13, wherein the amount of the light reaching the eyes of the subject is adjusted by controlling the operation of the light source device according to the awakening state of the subject. The awakening method according to claim 14, wherein the adjustment of the amount of light is realized by adjusting the amount of light emitted from the light source device. The awakening method according to claim 14, wherein the adjustment of the amount of light is realized by a change in an irradiation direction of light emitted from the light source device.