JP2015063264A - Lighting device in vehicle cabin and vehicle cabin lighting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device in a vehicle cabin which enables a lighting section to be adjusted so that proper luminance is obtained in a view point of an occupant thereby inhibiting the occupant from being annoyed even when physical frames of the occupants are different.SOLUTION: A lighting device in a vehicle cabin includes: a lighting section 4 which is attached to the interior of a vehicle cabin and lights an object in the vehicle cabin; a view point determination section 11 which determines a view point of an occupant; an angle calculation section 12 which calculates an angle formed by the occupant's visual line to the vehicle front side and the occupant's visual line to the lighting section; a luminance determination section 13 which determines the allowable luminance of the lighting section 4 according to the angle; and a lighting adjustment section 14 which adjusts the lighting section 4 so that the luminance becomes the allowable luminance.

Description

  The present invention relates to a vehicle interior lighting device and a vehicle interior lighting method.

  Conventionally, there is one that illuminates an operation unit with an illumination member attached to the interior of an automobile and assists the visual recognition of the operation unit (see, for example, Patent Document 1). In Patent Document 1, an illumination member incorporated in a door is turned on so that an inner handle used for getting off and a power window switch used for opening a window can be easily seen during traveling.

JP 2010-701116 A

  However, the positional relationship between the viewpoint of the occupant and the lighting member changes due to the difference in the physique of the occupant. For this reason, when the occupant's physique is relatively small, the brightness of reflected light at the occupant's viewpoint usually increases, and the occupant may feel troublesome.

  In view of the above-described problems, the object of the present invention is to adjust the illumination unit so that the brightness is appropriate for the occupant's viewpoint even when the occupant's physique is different, and to prevent the occupant from feeling annoying It is providing the vehicle interior lighting device and vehicle interior lighting method which can do.

  According to an aspect of the present invention, the vehicle interior lighting device includes an illumination unit that illuminates an object in the vehicle interior, determines a viewpoint of the occupant, a line-of-sight direction from the viewpoint to the front of the vehicle, and a line of sight to the illumination unit An angle formed with the direction is calculated, an allowable luminance is determined according to the angle, and the illumination unit is adjusted to achieve the allowable luminance.

  ADVANTAGE OF THE INVENTION According to this invention, even when a passenger | crew's physique differs, a lighting part can be adjusted so that it may become suitable brightness from a passenger | crew's viewpoint, and it can suppress that a passenger | crew feels troublesome In addition, a vehicle interior lighting method can be provided.

It is a block diagram which shows an example of the vehicle interior lighting apparatus which concerns on embodiment of this invention. It is the schematic which shows an example of the door interior component which concerns on embodiment of this invention. FIG. 3A is a top view showing a state when a relatively large occupant is seated in the vehicle interior according to the embodiment of the present invention. FIG. 3B is a side view corresponding to FIG. FIG. 4A is a top view showing a state when a relatively small occupant is seated in the vehicle interior according to the embodiment of the present invention. FIG. 4B is a side view corresponding to FIG. It is the schematic for demonstrating the luminance light distribution characteristic in the reflective surface which concerns on embodiment of this invention. It is the schematic which shows an example of the map showing the luminance distribution which concerns on embodiment of this invention. It is a table | surface which shows an example of the brightness | luminance data which matched the angle | corner with the gaze direction to the vehicle front which concerns on embodiment of this invention, and the gaze direction to an illumination part, and permissible brightness | luminance. It is the schematic for demonstrating an example of the viewpoint determination method which concerns on embodiment of this invention. It is a flowchart for demonstrating an example of the indoor lighting control method which concerns on embodiment of this invention. It is a block diagram which shows an example of the vehicle interior lighting apparatus which concerns on the 1st modification of embodiment of this invention. It is a block diagram which shows an example of the vehicle interior lighting apparatus which concerns on the 2nd modification of embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  The vehicle interior lighting device according to the embodiment of the present invention can be mounted on a vehicle such as an automobile. As shown in FIG. 1, the vehicle interior lighting device according to the embodiment of the present invention includes a control device 1, a seat position detection unit 2, a storage device 3, and a lighting unit 4.

  As shown in FIG. 2, the illumination unit 4 is an indirect illumination that is disposed on the door trim 5 and illuminates the inner handle (object) 6. The illumination unit 4 is embedded in the door trim 5 in the vicinity of the inner handle 6 so as not to directly illuminate the passenger compartment and the passenger. The occupant's visibility can be improved by the reflected light that the illumination unit 4 illuminates the inner handle 6. As the illumination unit 4, a light source such as a light emitting diode (LED) or organic electroluminescence (EL) illumination can be used.

  The illumination unit 4 is not particularly limited to the one that illuminates the inner handle 6. For example, the illumination unit 4 may illuminate an operation unit such as a power window switch attached to the armrest or a trunk opener attached to the feet of the passenger. Moreover, the position where the illumination part 4 is arrange | positioned is not specifically limited, It arrange | positions in the position which is easy to illuminate an operation part. For example, when illuminating a power window switch, the illumination unit 4 may be disposed in the vicinity of the armrest. When the trunk opener is illuminated, the illumination unit 4 may be disposed near the floor surface of the door trim 5. Moreover, the illumination part 4 may be arrange | positioned at interior materials other than the door trim 5 located in front and a downward direction of a passenger | crew's viewpoint.

  FIG. 3A and FIG. 3B show a situation when the occupant (driver) 100 is seated on a seat in the passenger compartment. Here, as shown in FIGS. 3A and 3B, the traveling direction of the vehicle is defined as the x direction, the vehicle width direction is defined as the y direction, and the vertical direction is defined as the z direction. The traveling direction (x direction) of the vehicle is substantially the same as the line of sight L1 forward of the vehicle while the occupant 100 is driving. Further, the three-dimensional coordinate of the position (reference point) P0 of the illumination unit 4 is (x0, y0, z0), and the three-dimensional coordinate of the viewpoint (eye point) P1 of the occupant 100 is (x1, y1, z1). The position P0 of the illumination unit 4 can be set at an arbitrary position such as a light source surface or a reflection surface of the illumination unit 4.

  4 (a) and 4 (b) show a state in which an occupant 100 having a smaller physique than the occupant 100 shown in FIGS. 3 (a) and 3 (b) is seated on a seat in the passenger compartment. . As shown in FIGS. 3A to 4B, when the physique of the occupant 100 is different, the position of the viewpoint P1 is substantially the same in the y direction, but greatly changes in the x direction and the z direction. For example, when the physique of the occupant 100 becomes relatively small, the distance D1 between the position P0 of the illumination unit 4 and the viewpoint P1 becomes small, the line of sight L1 from the viewpoint P1 of the occupant 100 to the front of the vehicle, and the illumination unit from the viewpoint P1. The angle θ1 formed by the line of sight L2 toward the position P0 of 4 increases. Thus, since the distance D1 and the angle θ1 with respect to the illumination unit 4 change due to the difference in the physique of the occupant 100, the luminance of the reflected light that the illumination unit 4 illuminates the inner handle 6 also changes.

Here, the luminance is the brightness per unit area of the light source. In general, the luminance of the light source surface and the reflection surface is constant regardless of the distance between the light source and the viewpoint. FIG. 5 shows luminance light distribution characteristics when incident light indicated by a thick solid line is incident on the reflecting surface at an incident angle θi. The dashed-dotted line in FIG. 5 indicates the light distribution characteristic of the luminance _LPD when the reflecting surface is an ideal uniform diffuse reflecting surface. The Lambertian reflecting surface, the luminance L _PD of the reflected light does not depend on the reflection angle [theta] r, it is constant even when observed from any angle.

  However, the luminance distribution characteristic of the reflective surface varies greatly depending on the material and surface shape of the reflective surface. For this reason, the normal reflection surface diffuses non-uniformly, and the luminance changes depending on the reflection angle θr. In general, the light distribution characteristic of the luminance L (θr) as shown by the dotted line in FIG. 5 is obtained, the luminance L (θr) in the regular reflection direction is large, and the luminance is decreased as it deviates from the regular reflection direction.

  In addition, the interior parts of the vehicle represented by the door trim 5 have few flat portions on the surface, and the reflective surface of the indirect illumination by the illuminating unit 4 often has a curved shape with design properties. For this reason, when the reflection angle θr changes, the change in the luminance L (θr) becomes very large.

  For example, in the illumination unit 4 that illuminates the inner handle 6, when the angle θ1 formed by the line of sight L1 of the occupant 100 toward the front of the vehicle and the line of sight L2 toward the position P0 of the illumination unit 4 is 40 ° or more, the luminance is almost completely diffused. Although it does not change so much, if it is less than 40 °, the reflectivity may be remarkably lowered and the luminance may be reduced. Thus, when the angle θ1 of the occupant 100 with respect to the illumination unit 4 changes due to the difference in the physique of the occupant 100, the reflection angle θr of the reflected light incident on the viewpoint P1 also changes, so the brightness of the reflected light at the viewpoint P1 changes. To do.

FIG. 6 shows a map M of luminance distribution characteristics of an area covering the door trim 5 in the vehicle interior when the viewpoint P1 is fixed. The map M is obtained experimentally, and the area covering the door trim 5 in the vehicle compartment is divided into small areas, and the allowable luminance is measured for each light source arranged in accordance with the layout for each small area. Here, the “allowable luminance” is the luminance set by the light source when the upper limit value of luminance that can be allowed by the occupant 100 at the viewpoint P1 (which can be arbitrarily set, for example, 0.1 cd / m ² ). means. In FIG. 6, it is divided into four levels of hatching according to the luminance value, and shows that the luminance is higher in the order of the small areas A1, A2, A3, A4. Actually, a luminance value is displayed for each small area of the map M. A plurality of maps M are created by changing the angle θ1 formed by the line of sight L1 forward of the occupant 100 and the line of sight L2 toward the position P0 of the illumination unit 4.

  FIG. 7 is a table (luminance data) in which an angle θ1 formed by the line of sight L1 forward of the occupant 100 and the line of sight L2 toward the position P0 of the illuminating unit 4 is associated with the luminance allowable at the viewpoint P1 of the occupant 100. Indicates. The luminance data is obtained experimentally, and can be created, for example, by extracting the luminance of a common area from a plurality of maps M created by changing the viewpoint P1. In FIG. 7, the luminance data is divided into four stages, but it may be divided into two or three stages, and may be further divided into multiple stages (five stages or more).

  For example, a hard disk drive (HDD) or a semiconductor memory can be used as the storage device 3. The storage device 3 stores a map M as shown in FIG. 6 in advance for each viewpoint P1. Furthermore, the storage device 3 uses the three-dimensional coordinates (x0, y0, z0) of the position P0 of the illumination unit 4, the type of the illumination unit 4, the shape and material (reflectance) of the reflection surface of the illumination unit 4 as vehicle information. Store in advance. Furthermore, the storage device 3 stores a program for the control device 1 to execute a series of processes.

  The seat position detection unit 2 detects information on the seat position where the occupant 100 is seated, and transmits a detection signal to the control device 1. As shown in FIG. 8, the seat position information includes the horizontal distance (seat slide amount) D11 from the center position P11 of the steering wheel 20 to the saddle position P12 and the vertical direction from the floor surface 23 to the saddle position P12. And an angle (torso angle) θt at which the torso (torso) is inclined with respect to the vertical direction when the occupant 100 is seated around the thigh position P12. The seat slide amount D11 and the seat lift amount D12 can be detected from the position of the seat cushion 21. Further, the torso angle θt can be detected from the amount of inclination of the seat back 22.

  As the control device 1 shown in FIG. 1, a central processing unit (CPU), a ROM, a RAM, an electronic control unit (ECU) mainly composed of an I / O interface, and the like can be used. The control device 1 includes a viewpoint determination unit 11, an angle calculation unit 12, a luminance determination unit 13, and an illumination adjustment unit 14 when the process executed by the control device 1 is functionally captured.

  The viewpoint determination unit 11 determines the three-dimensional coordinates (x1, y1, z1) of the viewpoint P1 according to the physique of the occupant 100 based on the information on the seat position detected by the seat position detection unit 2. For example, the viewpoint determination unit 11 can estimate the dimensions D21 to D23 corresponding to the physique shown in FIG. 8 based on the seat slide amount D11 detected by the seat position detection unit 2. The dimension D21 is a dimension in the horizontal direction from the top of the head to the viewpoint P1. The dimension D22 is a dimension in the vertical direction from the shoulder position P13 to the viewpoint P1. The dimension D23 is a dimension from the shoulder position P13 to the buttocks position P12. Furthermore, the viewpoint determination unit 11 determines the three-dimensional coordinates (x1, y1, z1) of the viewpoint P1 by correcting the estimated viewpoint P1 based on the seat lift amount D12 and the torso angle θt.

  As the three-dimensional coordinates (x1, y1, z1) of the viewpoint P1, for example, the position coordinates of a single eye (right eye or left eye) may be calculated, or the position coordinates of the center of both eyes may be calculated. Alternatively, the position coordinates of both eyes may be calculated and the subsequent processing may be performed individually.

  The angle calculation unit 12 includes the three-dimensional coordinates (x1, y1, z1) of the viewpoint P1 determined by the viewpoint determination unit 11 and the three-dimensional coordinates (x0, y0) of the position P0 of the illumination unit 4 stored in the storage device 3. , Z0), an angle θ1 formed by the line of sight L1 of the occupant 100 toward the front of the vehicle and the line of sight L2 toward the position P0 of the illumination unit 4 is calculated.

The luminance determination unit 13 calculates the allowable luminance of the illumination unit 4 according to the angle θ1 calculated by the angle calculation unit 12. For example, the luminance determination unit 13 reads the luminance data shown in FIG. 7 from the storage device 3 and determines the allowable luminance according to the angle θ1 calculated by the angle calculation unit 12. For example, using the luminance data shown in FIG. 7, if the angle θ1 calculated by the angle calculation unit 12 is 50 °, the allowable luminance is determined to be 1 cd / m ² .

  In addition, the luminance determination unit 13 reads the map M corresponding to the angle θ1 calculated by the angle calculation unit 12 from the map M as shown in FIG. 6 from the storage device 3, and the illumination unit 4 in the map M It is also possible to extract the luminance of the small area corresponding to, and determine the allowable luminance. In addition, the luminance determination unit 13 uses the angle θ1 calculated by the angle calculation unit 12, the position of the irradiation surface of the illumination unit 4 read from the storage device 3, the vehicle information such as the material (reflectance) and shape of the reflection surface. Based on this, the allowable luminance of the illumination unit 4 may be calculated.

  The illumination adjusting unit 14 adjusts the luminance of the illuminating unit 4 so that the allowable luminance determined by the luminance determining unit 13 is obtained. For example, when the current luminance of the illumination unit 4 is higher than the allowable luminance determined by the luminance determination unit 13, the luminance of the illumination unit 4 is adjusted to be small. On the other hand, when the current luminance of the illumination unit 4 is smaller than the allowable luminance determined by the luminance determination unit 13, the luminance of the illumination unit 4 may be adjusted to be increased.

  Next, an example of the vehicle illumination method according to the embodiment of the present invention will be described with reference to the flowchart of FIG. This series of processing is repeated, for example, continuously or every predetermined period while the vehicle is traveling.

  In step S10, the illumination adjustment unit 14 turns on the illumination unit 4 based on the operation of the ignition key of the occupant 100 or the like. In step S11, the illumination adjustment unit 14 determines whether or not the vehicle is traveling based on the current vehicle speed and the like. If it is determined that the vehicle is not running, the viewpoint P1 of the occupant 100 is not fixed at the time of getting on and off, preparation for driving, or parking, and there is almost no difference in the way the person feels brightness. Complete the process because it is possible.

  On the other hand, if it is determined in step S11 that the vehicle is traveling, the seat position of the occupant 100 is fixed, and the viewpoint P1 in a posture capable of driving is fixed, so the process proceeds to step S12. In step S12, the seat position detection unit 2 detects the seat position where the occupant 100 is seated. In step S <b> 13, the viewpoint determination unit 11 determines the three-dimensional coordinates (x1, y1, z1) of the viewpoint P <b> 1 of the occupant 100 based on the seat position detected by the seat position detection unit 2.

  In step S <b> 14, the angle calculation unit 12 determines the three-dimensional coordinates (x1, y1, z1) of the viewpoint P <b> 1 determined by the viewpoint determination unit 11 and the position P <b> 0 of the illumination unit 4 stored in advance in the storage device 3. From the coordinates (x0, y0, z0), an angle θ1 formed by the line of sight L1 forward of the occupant 100 and the line of sight L2 toward the position P0 of the illumination unit 4 is calculated.

  In step S <b> 15, the luminance determination unit 13 determines the allowable luminance of the illumination unit 4 according to the angle θ <b> 1 calculated by the angle calculation unit 12 based on the map M and luminance data stored in the storage device 3.

  In step S <b> 16, the illumination adjustment unit 14 adjusts the luminance of the illumination unit 4 so as to be the allowable luminance determined by the luminance determination unit 13.

  According to the embodiment of the present invention, the angle θ1 formed by the line of sight L1 forward of the occupant 100 and the line of sight L2 toward the position P0 of the illumination unit 4 is calculated, and the luminance of the illumination unit 4 is determined according to the angle θ1. Since the adjustment is performed, the brightness of the illumination unit 4 is adjusted so that the brightness is appropriate at the viewpoint P1 of the occupant 100 even if the positional relationship between the viewpoint P1 and the illumination unit 4 changes when the occupant 100 of different physique is seated. can do. Therefore, the occupant 100 can perform safe driving without feeling indirect lighting by the lighting unit 4 bothering.

  Further, by determining (estimating) the viewpoint P1 from the seat position of the occupant 100, the viewpoint P1 corresponding to the physique of the occupant 100 can be determined.

(First modification)
The vehicle interior lighting device according to the first modification of the embodiment of the present invention is different from the embodiment of the present invention in that an imaging unit 7 is provided instead of the seat position detection unit 2 as shown in FIG. Different.

  The imaging unit 7 is an in-vehicle camera attached in the passenger compartment, and images the face of the occupant 100. The viewpoint determination unit 11 specifies the viewpoint P1 of the occupant 100 from the image captured by the imaging unit 7, and determines the three-dimensional coordinates (x1, y1, z1) of the viewpoint P1. As a method for specifying the viewpoint P1 from the captured image, a general face recognition technique can be used. Since the other configuration of the vehicle interior lighting device according to the first modification of the embodiment of the present invention is substantially the same as that of the embodiment of the present invention, redundant description is omitted.

  According to the first modification of the embodiment of the present invention, the seat position detection unit 2 shown in FIG. 1 uses the imaging unit 7 to capture the face of the occupant 100 and identify the viewpoint P1 from the captured image. Even when the physique and viewpoint P1 of the occupant 100 calculated (estimated) based on the detected seat position are different from the physique and viewpoint P1 of the actual occupant 100, the viewpoint P1 is determined more accurately. be able to. Furthermore, since the camera used for the crime prevention and doze prevention can be used as the imaging unit 7, the viewpoint P1 can be specified with a simple configuration.

(Second modification)
The vehicle interior lighting device according to the second modification of the embodiment of the present invention is different from the embodiment of the present invention in that the illumination unit 4 includes a plurality of indirect lights 41 to 44 as shown in FIG. Different.

  The illumination unit 4 includes a right door indirect illumination 41 disposed on the right (driver's side) door, a left door indirect illumination 42 disposed on the left (passenger side) door, and a right floor indirect illumination 43 disposed on the right floor. And left floor indirect illumination 44 disposed on the left floor. The right door indirect illumination 41 and the left door indirect illumination 42 illuminate operation sections such as inner handles on the driver's seat side and the passenger seat side, respectively. The right floor indirect illumination 43 and the left floor indirect illumination 44 illuminate operation parts such as a trunk opener on the driver seat side and the passenger seat side, respectively.

  The angle calculation unit 12 calculates, for each of the indirect lights 41 to 44, an angle formed by the line of sight of the occupant in front of the vehicle and the line of sight of each of the indirect lights 41 to 44. The luminance determination unit 13 determines the allowable luminance of each indirect illumination 41 to 44 according to the angle calculated by the angle calculation unit 12. For example, the permissible brightness of each of the indirect lights 41 to 44 is determined by extracting the brightness of the area corresponding to each of the indirect lights 41 to 44 from the map M shown in FIG. Moreover, the brightness | luminance data as shown in FIG. 7 may be produced for every indirect illumination 41-44, and permissible brightness | luminance may be determined using the brightness data for every indirect illumination 41-44, respectively. The illumination adjustment unit 14 adjusts each of the indirect illuminations 41 to 44 so that the allowable luminance determined by the luminance determination unit 13 is obtained.

  Here, for example, when the brightness of the plurality of indirect lights 41 to 44 is uniformly changed according to the speed of the vehicle, the brightness varies due to the difference in the distance between the viewpoint P1 and the indirect lights 41 to 44, The passenger may feel annoyed. On the other hand, according to the second modification of the embodiment of the present invention, when the plurality of indirect lights 41 to 44 are provided, the plurality of indirect lights 41 to 44 are controlled according to the physique of the occupant 100, respectively. can do. Therefore, it is possible to achieve appropriate luminance at the viewpoint P1 of the occupant 100, and the occupant can perform safe driving without feeling inconvenience.

  In addition, according to the 2nd modification of embodiment of this invention, although the case where it had four indirect lighting 41-44 was demonstrated, the number of indirect lighting is not specifically limited, It was two or three. It may be more than one (five or more).

  Moreover, the illuminance information according to the angle formed by the line of sight of the occupant 100 in front of the vehicle and the line of sight of each of the indirect lights 41 to 44 is stored in the storage device 3 in advance, and the illumination adjustment unit 14 Illuminance corresponding to the angle formed by the line of sight toward the front of the vehicle and the line of sight to each of the indirect lights 41 to 44 is summed, and the illuminance of each of the indirect lights 41 to 44 is such that the sum of the illuminances is not more than a predetermined threshold value. May also be adjusted. In this case, appropriate illuminance can be provided at the viewpoint P1 of the occupant 100, and the occupant 100 can perform safe driving without feeling inconvenience.

(Other embodiments)
As described above, the present invention has been described according to the embodiment. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the embodiment of the present invention, the case where the occupant 100 is a driver has been described, but an occupant other than the driver may be targeted. When a plurality of occupants 100 are seated, the vehicle interior lighting method according to the embodiment of the present invention may be applied to each occupant 100.

  In the embodiment of the present invention, the case where the sheet position detection unit 2 is provided will be described. In the first modification of the embodiment of the present invention, the case where the imaging unit 7 is provided instead of the sheet position detection unit 2 will be described. However, both the sheet position detection unit 2 and the imaging unit 7 may be provided and used appropriately.

  Further, in the embodiment of the present invention, the indirect illumination for illuminating the operation unit such as the inner handle 6 as the illumination unit 4 has been described, but the present invention is not particularly limited thereto. For example, the illumination unit 4 may illuminate an object such as an interior part such as a door pocket.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 ... Control apparatus 2 ... Seat position detection part 3 ... Memory | storage device 4 ... Illumination part 5 ... Door trim 6 ... Inner handle 7 ... Imaging part 11 ... Viewpoint determination part 12 ... Angle calculation part 13 ... Luminance determination part 14 ... Illumination adjustment part 20 ... Steering 21 ... Seat cushion 22 ... Seat back 23 ... Floor surface 41-44 ... Indirect lighting 100 ... Crew

Claims (5)

An illumination unit that is mounted in a vehicle interior and illuminates an object in the vehicle interior;
A viewpoint determination unit that determines the viewpoint of the occupant;
An angle calculation unit that calculates an angle formed by a line of sight from the viewpoint to the front of the vehicle and a line of sight to the illumination unit;
A luminance determining unit that determines an allowable luminance of the illumination unit according to the angle;
A vehicle interior lighting device comprising: an illumination adjustment unit that adjusts the illumination unit to achieve the allowable luminance. A seat position detector for detecting a seat position on which the occupant is seated;
The vehicle interior lighting device according to claim 1, wherein the viewpoint determination unit determines the viewpoint based on a seat position detected by the seat position detection unit. An imaging unit for imaging the occupant's face;
The vehicle interior lighting device according to claim 1, wherein the viewpoint determination unit determines the viewpoint based on an image captured by the imaging unit. It has a plurality of the illumination parts,
The angle calculation unit calculates, for each illumination unit, an angle formed by a line of sight of the occupant in front of the vehicle from the viewpoint and a line of sight to the illumination unit,
The luminance determination unit determines the allowable luminance of the plurality of illumination units according to the angle;
The vehicle interior lighting device according to any one of claims 1 to 3, wherein the illumination adjustment unit adjusts the plurality of illumination units so as to achieve the allowable luminance. Determining the occupant's point of view;
Calculating an angle formed by a line of sight from the viewpoint to the front of the vehicle and a line of sight to an illumination unit that illuminates an object in the vehicle interior;
Determining an allowable luminance of the illumination unit according to the angle;
Adjusting the illumination unit so as to achieve the allowable luminance.

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