WO2015145607A1

WO2015145607A1 - On-board lighting device

Info

Publication number: WO2015145607A1
Application number: PCT/JP2014/058486
Authority: WO
Inventors: 真阿部; 明年菊地
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2014-03-26
Filing date: 2014-03-26
Publication date: 2015-10-01

Abstract

　One example of a problem to be solved by the present invention is to overcome operation complexity and high costs, and to use space more efficiently. The present invention is an on-board lighting device (1, 3, 4), characterized in being provided with a laser light source (11) installed in a vehicle interior, a mirror (12, 32, 42) for reflecting light from the laser light source (11), and a control means (13, 33) for controlling the orientation of the mirror (12, 32, 42) relative to the radiated direction of the light, the control means (13, 33) controlling the orientation of the mirror (12, 32, 42) so that the light is radiated toward a ceiling (22) inside the vehicle interior.

Description

In-vehicle lighting system

The present invention relates to an in-vehicle lighting device.

A lamp that is installed on the ceiling of a passenger compartment and illuminates the entire interior of the passenger compartment is known as an in-vehicle lighting device. There has also been proposed an illumination device that reflects light having directivity with a mirror and performs spot irradiation for alerting a passenger (see, for example, Patent Document 1).

JP 2013-39845 A

Conventionally, individual lighting devices are often provided for overall illumination and spot irradiation. The reason for this is that light having no directivity, such as light emitted from a lamp, is suitable for overall illumination, whereas light having directivity, as described above, is suitable for spot illumination. Yes. In addition, regarding the provision of a plurality of illumination devices for overall illumination or spot illumination, there are problems such as complicated operation, high cost, and poor space efficiency. Thus, as an example of a problem to be solved by the present invention, problems such as overcoming complexity of operation and high cost and improving space efficiency can be cited as an example.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a laser light source installed in a vehicle interior, a mirror that reflects light from the laser light source, and a direction of the mirror with respect to an irradiation direction of the light. And a control means for controlling the mirror, wherein the control means controls the direction of the mirror so that the light is emitted to the ceiling side of the vehicle interior. .

It is a schematic diagram which shows the vehicle-mounted illuminating device of 1st Example. It is a schematic diagram which shows the vehicle-mounted illuminating device of another example. It is a flowchart showing the flow of control with respect to the vehicle interior and exterior illumination in the vehicle-mounted illumination device of a present Example. It is a figure which shows an example of the image projected on a part of ground under the opened door. It is a figure which shows an example of the image projected on a part of upper surface of a dashboard at the time of first driving of an engine etc. in the morning. It is a schematic diagram which shows a mode that an irradiation area and an irradiation shape are changed. It is a schematic diagram which shows the vehicle-mounted illuminating device of 2nd Example.

Hereinafter, an in-vehicle illumination device according to an embodiment of the present invention will be described. An in-vehicle illumination device according to an embodiment of the present invention includes a laser light source installed in a vehicle interior, a mirror that reflects light from the laser light source, and a control unit that controls the direction of the mirror with respect to the light irradiation direction. It is equipped with. And a control means controls the direction of a mirror so that light may be irradiated to the ceiling side of a vehicle interior. In this in-vehicle illuminating device, the light emitted from the laser light source, which has directivity and can be used as spot illumination, is irradiated on the ceiling side in the vehicle interior by controlling the direction of the mirror by the control means. The irradiated light is absorbed and diffusely reflected by the ceiling in the vehicle interior, and illuminates the entire vehicle interior as indirect light. In addition, since the light that is the source of the indirect light has directivity, for example, the direction of the mirror is changed by the control means, and direct light as spot illumination is irradiated to a desired part. Is also possible. Thus, according to the vehicle-mounted illumination device according to the embodiment of the present invention, both the overall illumination of the passenger compartment and the spot illumination are possible, as compared to providing the illumination device for each illumination individually. Therefore, the cost and complexity of operation can be suppressed, and the space efficiency in the passenger compartment is improved.

In the in-vehicle illumination device according to the embodiment of the present invention, it is preferable that the ceiling is provided with a light absorbing member that absorbs part of the irradiated light. Here, the light absorbing member may be a normal interior member of an automobile, and may utilize the light absorptivity and diffusibility that the interior member originally has. Alternatively, it may be a member that has desired absorption and diffusibility and controls the intensity of indirect light to a desired intensity. With such a light absorbing member, indirect light more suitable for overall illumination can be obtained.

In the in-vehicle illumination device according to the embodiment of the present invention, it is also preferable that the control means controls the direction of the mirror so that the light is irradiated to a part of the lower part than the ceiling inside and outside the vehicle interior. is there. Thereby, it is possible to easily switch between overall illumination of the vehicle interior by indirect light and spot illumination by direct light on a part of the portion lower than the ceiling.

In a preferred in-vehicle illumination device that controls the mirror so that a part of the part lower than the ceiling is irradiated, it is further preferred that the laser light source projects an image drawn using a dot matrix. is there. According to this preferred in-vehicle illumination device, a desired image such as an image for representing some information with characters or figures or an image for illuminating a range of a desired size or shape is projected upon spot illumination. be able to.

Further, in the above-described preferable in-vehicle illumination device provided with a laser light source that projects an image drawn using a dot matrix, the laser light source has a plurality of light emitting elements that emit light of different colors. Further preferred. Examples of the different colors include red (R), green (G), and blue (B), which are known as the three primary colors of light. By using such a laser light source, a color image can be projected upon spot illumination.

Further, in the above-described preferable in-vehicle illumination device including a laser light source that projects an image drawn using a dot matrix, the laser light source changes the area of the image drawn using the dot matrix, thereby It is further preferable to change the irradiation area. By using such a laser light source, a desired irradiation area can be obtained for spot illumination.

Further, in the above-described preferable in-vehicle illumination device provided with a laser light source that projects an image drawn using a dot matrix, the laser light source changes the shape of the image drawn using the dot matrix, thereby It is further preferable to change the irradiation shape. By using such a laser light source, a desired irradiation shape can be obtained for spot illumination.

Further, in the above-described preferable in-vehicle illumination device provided with a laser light source that projects an image drawn using a dot matrix, it is further preferable that the portion irradiated with light is as follows. That is, it is more preferable that the part is a part of the upper surface of the dashboard, a part of the floor in front of the seat, or a part of the ground under the opened door. These parts are all easily spotted by the passenger and are suitable as spot illumination parts. In addition, since the light from the laser light source has a deep focal depth, even when an image is projected onto the above-described plurality of parts having different optical path lengths from the laser light source, a focus shift can be suppressed. That is, according to this more preferable in-vehicle illumination device, spot illumination by fine irradiation expression can be performed on a plurality of parts that are easily noticeable by the passenger as described above.

Further, in the above-mentioned preferable in-vehicle lighting device in which the control means controls the direction of the mirror so that the part is irradiated, a part of the upper surface of the dashboard, a part of the floor in front of the seat, or a part of the ground Further, it is more preferable that a character image is projected. Thereby, various information can be displayed on the part which is easily noticeable to the passenger as described above.

Further, in the above-described preferable in-vehicle illumination device in which light that draws an image including a character is irradiated on the part, the mirror is a half mirror, and the light is lower than the ceiling side in the vehicle interior and the ceiling in the vehicle interior. It is more preferable to irradiate a part of Accordingly, it is possible to display the information for the passenger and at the same time perform the overall illumination with the indirect light.

A vehicle-mounted illumination device according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic diagram showing an in-vehicle illumination device according to a first embodiment. The in-vehicle illumination device 1 shown in FIG. 1 is installed on a ceiling 21 of a passenger compartment of an automobile 2 and is an illumination device that can switch between overall illumination by indirect light and spot illumination by direct light. . FIG. 1A shows a state in which the overall illumination is performed by the in-vehicle illumination device 1. FIG. 1B shows a state in which spot illumination is performed by the in-vehicle illumination device 1. The in-vehicle illumination device 1 includes a laser projector 11, a movable mirror 12, and a movable mirror control unit 13.

The laser projector 11 is a light source in which a plurality of RGB three-color LEDs are two-dimensionally arranged. The laser projector 11 draws and projects a color image using a dot matrix. Since the emitted light of each LED is directional laser light, the projection light of the laser projector 11 has directivity in the projection direction. Further, in this embodiment, the laser projector 11 is fixed to the ceiling 21 so as to emit projection light substantially in parallel with the ceiling 21 toward the front in the traveling direction D1 of the automobile 2. The laser projector 11 corresponds to an example of a laser light source according to the present invention.

The movable mirror 12 is a mirror that reflects the projection light of the laser projector 11. The movable mirror 12 is supported by the movable mirror control unit 13. In the present embodiment, the movable mirror 12 is disposed in front of the laser projector 11 in the traveling direction D1 of the automobile 2. This movable mirror 12 corresponds to an example of a mirror according to the present invention.

Here, in the movable mirror 12, the reflecting surface of the projection light of the laser projector 11 is a curved surface that is convexly curved in the traveling direction D1 of the automobile 2 for the reason described below.

The laser projector 11 has a rectangular parallelepiped shape, and the projection light emission port at the tip thereof has a rectangular shape. The laser projector 11 is made thin in the vertical direction in the passenger compartment so as not to give the passenger a feeling of overhead pressure in the passenger compartment. As a result, the projection light exit has a rectangular shape that is thin in the vertical direction. In the laser projector 11, an image is drawn so as to be accommodated in the thin rectangular exit. For this reason, if it projects as it is, the range which can be projected about the advancing direction D1 of the motor vehicle 2 may become narrow. Therefore, in the present embodiment, the reflecting surface of the movable mirror 12 is a curved surface that is convexly curved in the traveling direction D 1 of the automobile 2. For this reason, the image drawn by the projection light of the laser projector 11 is extended and reflected by the curved surface in the traveling direction D1 of the automobile 2. In the present embodiment, this expands the range that can be projected in the traveling direction D1 of the automobile 2.

The movable mirror control unit 13 controls the direction of the movable mirror 12 with respect to the light irradiation direction from the laser projector 11. The movable mirror control unit 13 is fixed to the ceiling 21 and supports the movable mirror 12 in front of the laser projector 11. In this embodiment, the movable mirror control unit 13 supports the movable mirror 12 so as to be rotatable about two rotation shafts shown in FIG. The first rotation axis Ax 1 is an axis that is substantially orthogonal to the traveling direction D 1 of the automobile 2 and that is substantially parallel to the ceiling 21. The second rotation axis Ax2 is an axis substantially parallel to both the traveling direction D1 of the automobile 2 and the ceiling 21. Then, the movable mirror control unit 13 rotates the movable mirror 12 around the first rotation axis Ax1 in the first rotation direction R1 shown in FIG. It is rotated around the rotation axis Ax2 in the second rotation direction R2 shown in FIG. The movable mirror control unit 13 controls the direction of the movable mirror 12 with respect to the light irradiation direction by such rotation. The movable mirror control unit 13 corresponds to an example of a control unit referred to in the present invention.

First, the movable mirror control unit 13 rotates the first rotation direction R1 so that the projection light of the laser projector 11 is directed toward the ceiling 21 in the vehicle interior as schematically shown in FIG. The direction of the movable mirror 12 is controlled so as to be irradiated. The reflected light L1 from the movable mirror 12 at this time is reflected by the ceiling 21. In general, the interior member 21a of the automobile ceiling 21 is subjected to so-called embossing. For this reason, the reflected light L1 is absorbed and diffusely reflected by the ceiling 21, and becomes indirect light L2 to illuminate the entire interior of the vehicle. The interior member 21a subjected to the texture processing corresponds to an example of the light absorbing member according to the present invention.

Further, the movable mirror control unit 13 causes the projection light of the laser projector 11 to be lower than the ceiling 21 in the vehicle interior as schematically shown in FIG. 1B by the rotation in the first rotation direction R1. The direction of the movable mirror 12 is controlled so that a part of the part is irradiated. Furthermore, the movable mirror control unit 13 controls the direction of the movable mirror 12 so that a part of the ground outside the vehicle is also irradiated by the rotation in the second rotation direction R2. The reflected light from the movable mirror 12 at this time is directly used as spot light as the direct light L3.

As described above, in this embodiment, the overall illumination by the indirect light L2 and the spot illumination by the direct light L3 are switched by the biaxial rotation control with respect to the movable mirror 12 by the movable mirror control unit 13.

Here, in this embodiment, as an example of the in-vehicle illumination device according to the present invention, the in-vehicle illumination device 1 in which the movable mirror 12 is disposed in front of the laser projector 11 in the traveling direction D1 of the automobile 2 is illustrated. Yes. However, the arrangement of the laser projector and the movable mirror is not limited to this form, and may be another arrangement as follows.

FIG. 2 is a schematic diagram showing another on-vehicle lighting device. In another example of the in-vehicle illumination device 3 shown in FIG. 2, a laser projector 31 is disposed in front of the movable mirror 32 in the traveling direction D 1 of the automobile 2. In this in-vehicle lighting device 3, the laser projector 31 is fixed to the ceiling 21 so as to emit projection light substantially parallel to the ceiling 21 toward the rear in the traveling direction D1. Also in this example, the movable mirror 32 is supported by the movable mirror control unit 33 so as to be rotatable by the two-axis control as described above. The whole mirror illumination by the indirect light L2 and the spot illumination by the direct light similar to the direct light L3 in FIG. 1B can be switched by the rotation of the movable mirror 32.

This completes the explanation of the other example and returns to the explanation of the first embodiment. In this embodiment, as shown in FIG. 1 (b), spot illumination is performed by a part Ar1 on the upper surface of the dashboard, a part Ar2 on the floor in front of the seat, and a part Ar3 on the ground below the opened door. , And four parts of the part Ar4 on the seat are switchable. This switching is performed by the movable mirror control unit 33 controlling the direction of the movable mirror 12 so that the projection light of the laser projector 11 is directed to each part.

Here, the vehicle-mounted lighting device of the present embodiment performs lighting inside and outside the vehicle according to the following control flow. FIG. 3 is a flowchart showing a flow of control for illumination inside and outside the vehicle interior in the in-vehicle illumination device of this embodiment. First, at the following timing, the vehicle-mounted lighting device 1 is automatically turned on, and the control represented by the flowchart of FIG. 3 is started. The timing includes, for example, when the door is opened after unlocking the door from the outside of the vehicle, when the motor of the engine or electric vehicle is driven for the first time in the morning, or when the door is opened with the engine key on. At these timings, any information service for passengers and spot lighting for alerting are performed.

The control represented by the flowchart of FIG. 3 is also started at the timing when the following instruction is given by the rider on board the illumination by the in-vehicle illumination device 1 via the operation unit (not shown). . Examples of this instruction include an instruction for overall illumination and spot illumination by the in-vehicle illumination device 1, an instruction for switching between overall illumination and spot illumination, and the like.

When the control represented by the flowchart of FIG. 3 is started, it is determined whether or not the overall illumination by the indirect light L2 is designated (step S1) and whether or not the spot illumination by the direct light L3 is designated (step S1). Step S2) is performed.

Here, in the present embodiment, when the control represented by the flowchart of FIG. 3 is automatically started as described above, spot illumination by the direct light L3 is automatically designated at the start. In the flowchart of FIG. 3, when spot illumination by the direct light L3 is designated (Yes determination in step S2), the following determination is performed for the spot illumination (step S3). In step S3, it is determined whether the spot illumination is pure spot illumination for illuminating the hand or spot illumination for information service or alerting (step S3).

In the present embodiment, when the control represented by the flowchart of FIG. 3 is automatically started, as described above, some information service for the passenger and spot lighting for alerting are performed. In the flowchart of FIG. 3, the direction of the movable mirror 12 is controlled so that the next part is directly irradiated with the light L 3 in the case of spot lighting for information service or alerting (Yes determination in step S 3). (Step S4). The part irradiated at this time is any one of a part Ar1 on the upper surface of the dashboard, a part Ar2 on the floor in front of the seat, or a part Ar3 on the ground under the opened door. Following the control of the movable mirror 12, the laser projector 11 emits projection light, and spot lighting for information service and alerting is performed by the direct light L3 reflected by the movable mirror 12 (step S5).

Here, when the control represented by the flowchart of FIG. 3 is started when the door is opened after the door is unlocked from outside the vehicle, a part Ar3 (see FIG. 1B) of the ground below the opened door is started. Spot lighting is performed. And the spot illumination at this time becomes illumination which projects the following images for information services.

FIG. 4 is a diagram showing an example of an image projected on a part of the ground under the opened door. In the example of FIG. 4, a character image Gr1 for information service that conveys welcome to the passenger with the characters “Welcome” is projected onto a part Ar3 of the ground below the opened door 22. The image at this time may be a character image including characters other than “Welcome”, or may be a graphic image such as a logo of an automobile manufacturer.

As described above, the laser projector 11 draws and projects an image using a dot matrix, and in this embodiment, the above-described character image and graphic image are drawn using the dot matrix in the laser projector 11. It is. Spot irradiation to a part of the ground Ar3 under the door 22 ends when the passenger gets on and closes the door 22.

Further, when the control represented by the flowchart of FIG. 3 is started in response to the first driving of the engine or the like in the morning, a part Ar1 of the upper surface of the dashboard or a part Ar2 of the floor in front of the seat (FIG. 1B) Spot lighting is performed. Which of the two parts is subjected to spot illumination depends on a setting operation performed in advance by the passenger. In any case, the spot illumination at this time is illumination for projecting the following image for the information service. Hereinafter, an image projected by the spot illumination will be described on the assumption that a part Ar1 on the upper surface of the dashboard is set as a spot illumination part at the time of first driving of the engine or the like.

FIG. 5 is a diagram showing an example of an image projected on a part of the upper surface of the dashboard when the engine or the like is driven for the first time in the morning. In the example of FIG. 4, a character image Gr2 for information service that conveys morning greetings to the passengers with the characters “Good Morning” is projected onto a part Ar1 on the upper surface of the dashboard. The image at this time may be a character image including characters other than “Good Morning”, or may be any graphic image that conveys a morning greeting, for example. . In this way, spot irradiation for drawing an image that conveys a morning greeting ends after a certain period of time has elapsed.

In addition, as described above, when an event that requires an alert to the passenger is detected, such as when the door is opened with the engine key on, the detection of such an event is triggered. The control represented by the flowchart of FIG. 3 is started. In the present embodiment, spot lighting is performed on a part Ar1 on the upper surface of the dashboard and a part Ar2 on the floor in front of the seat even in the case of such alerting. For example, when the door is opened with the engine key on, a character image for an information service that calls the passenger's attention, such as “Kye Inserted”, is projected on a part Ar1 etc. on the top surface of the dashboard. Is done. Such spot lighting for projecting an image for alerting ends when the causal event for alerting is resolved.

In addition, as described above, the laser projector 11 projects a color image, and in the present embodiment, the above-described character image and graphic image are projected in color.

Here, in addition to the case where the control represented by the flowchart of FIG. 3 is automatically started as described above, the flowchart of FIG. 3 is also used when spot illumination is instructed by a passenger on board. The control to represent is started and spot illumination is performed. In the present embodiment, the spot lighting instruction by the passenger is, for example, designated as pure spot lighting for illuminating a hand or spot lighting for some information service such as navigation information. Done.

When spot illumination for information service is designated by the passenger, a Yes determination is made in step S3 in the flowchart of FIG. 3, and the processing in steps S4 and S5 is executed. As a result, an image for information service is projected by spot lighting on a part Ar1 on the upper surface of the dashboard and a part Ar2 on the floor in front of the seat. In the present embodiment, it is possible for the passenger to instruct the projection location of such an image to switch from the part Ar2 of the floor in front of the seat to the part Ar1 of the upper surface of the dashboard and vice versa. It has become. When such switching is instructed, the movable mirror control unit 13 controls the direction of the movable mirror 12 so that an image is projected at the designated projection location.

On the other hand, when pure spot illumination is designated by the passenger, the determination is No in step S3 in the flowchart of FIG. 3, and the process proceeds to step S5. In step S5, the movable mirror control unit 13 controls the direction of the movable mirror 12 so that the projection light of the laser projector 11 is directed to a part Ar4 on the seat (see FIG. 1B). Subsequently, the laser projector 11 performs projection light irradiation (step S6).

Here, in the present embodiment, since the laser projector 11 draws and projects an image using a dot matrix, the irradiation area of the spot illumination can be changed by changing the area of the image. Furthermore, the irradiation shape of the spot illumination can be changed by changing the shape of the image drawn using the dot matrix.

FIG. 6 is a schematic diagram showing how the irradiation area and the irradiation shape are changed. FIG. 6A shows an example in which spot illumination with a rectangular irradiation shape is performed with an irradiation area over a part Ar4 on both of the two seats 23. FIG. 6B shows an example in which spot illumination with a circular irradiation shape is performed with an irradiation area limited to a part Ar4 on the seat of one seat 23. FIG. 6C shows an example in which star-shaped spot illumination is performed with an irradiation area limited to a part Ar4 on the seat of one seat 23.

In the example of FIG. 6 (a), the irradiation area over part Ar4 on both seats is realized by the laser projector 11 drawing an image for spot illumination over the rectangular exit port. In the example of FIG. 6B and the example of FIG. 6C, the irradiation area limited to only part Ar4 on the seat of one of the seats 23 is shown in FIG. This is realized by drawing an image for spot illumination only on a part of the left side. In addition, a circular irradiation shape or a star-shaped irradiation shape is realized by the laser projector 11 drawing an image of such a shape with a dot matrix.

Further, the laser projector 11 projects a color image. For this reason, in a present Example, it is possible to perform spot illumination with a desired color. For example, spot illumination with white light, warm color light, cold color light, or the like is possible.

Here, as described above, in this embodiment, the reflecting surface of the movable mirror 12 is convexly curved, and the image drawn by the laser projector 11 is stretched and reflected in the traveling direction D1 of the automobile 2. . In FIG. 6, an irradiation shape that is a rectangular shape, an oval shape, or an oblong shape extended by the movable mirror 12 is shown in a balloon. The irradiation shape extended by the movable mirror 12 is contracted in the traveling direction D1 of the automobile 2 in the process of being projected, and becomes a desired shape such as a rectangular shape, a circular shape, or a star shape at the projection site.

In the spot illumination described above, the irradiation area and irradiation shape can be switched according to a switching instruction from the passenger. Also, the color of the illumination can be switched according to a switching instruction from the passenger. This spot lighting is continued until the passenger gives an instruction to switch to spot lighting or general lighting for information services, or until an instruction to turn off is given.

Further, the control represented by the flowchart of FIG. 3 is also started when the entire lighting by the indirect light L2 is instructed by the passenger on board. In this case, in the flowchart of FIG. 3, a Yes determination is made in step S1, and the process proceeds to step S7.

In step S7, as shown in FIG. 1A, the direction of the movable mirror 12 is controlled by the movable mirror control unit 13 so that the projection light of the laser projector 11 is irradiated onto the ceiling 21. Then, as shown in FIG. 6A, the laser projector 11 projects and projects a plain image over the entire emission port. Thereby, the projection light full of the emission port is reflected by the movable mirror 12 and irradiated onto the ceiling 21. As described above, the interior member 21a of the ceiling 21 has been subjected to graining, and the projection light is absorbed and diffusely reflected by the ceiling 21, and this reflected light becomes indirect light L2 to illuminate the entire interior of the vehicle. put out.

Further, in the present embodiment, as in the spot illumination described above, the color in the overall illumination can be performed in a desired color according to a switching instruction from the passenger. For example, it is possible to perform overall illumination with white light, warm color light, cold color light, or the like.

In the in-vehicle illumination device 1 of the first embodiment described above, the light emitted from the laser projector 11 and having directivity and usable as spot light is the direction of the movable mirror 12 by the movable mirror control unit 13. The light is irradiated to the ceiling 21 side in the vehicle interior by the control. The irradiated light is absorbed and diffusely reflected by the ceiling 21 in the vehicle interior, and illuminates the entire vehicle interior as indirect light L2. Further, since the light that is the source of the indirect light L2 is laser light and has directivity, the movable mirror control unit 13 changes the direction of the movable mirror 12 to directly perform spot illumination on a desired part. It is also possible to irradiate the light L3. Thus, according to the vehicle-mounted illumination device 1 of the present embodiment, both the overall illumination of the passenger compartment and the spot illumination are possible. Compared with the case where the illumination device for each illumination is provided individually, the cost and It is possible to reduce the complexity of the operation.

Further, in the in-vehicle lighting device 1 of the present embodiment, the ceiling 21 is provided with an interior member 21a that absorbs and diffusely reflects a part of the light irradiated with the embossing process. Such an interior member 21a makes it possible to obtain indirect light L2 that is more suitable for overall illumination.

Moreover, in the vehicle-mounted illuminating device 1 of a present Example, the movable mirror control part 13 is irradiated so that light can be switched to the ceiling 21 side and a part of part lower than the ceiling 21 in a vehicle interior so that switching is possible. The direction of the movable mirror 12 is controlled. Thereby, it is possible to easily switch between the overall illumination of the vehicle interior by the indirect light L2 and the spot illumination by the direct light L3 for a part of the portion lower than the ceiling 21.

Further, in the in-vehicle lighting device 1 of the present embodiment, the laser projector 11 projects an image drawn using a dot matrix. As a result, it is possible to project a desired image such as an image for representing some information with characters or figures, an image for illuminating a range of a desired size or shape, and the like in spot illumination.

Further, in the in-vehicle illumination device 1 of the present embodiment, the laser projector 11 has RGB three-color LEDs. As a result, it is possible to project a color image upon spot illumination.

In the in-vehicle lighting device 1 of the present embodiment, the laser projector 11 changes the light irradiation area by changing the area of the image drawn using the dot matrix. Thereby, the illumination range of spot illumination can be changed to a desired range.

In the in-vehicle illumination device 1 of the present embodiment, the laser projector 11 changes the shape of the image drawn using the dot matrix, thereby changing the light irradiation shape. This makes it possible to obtain a desired irradiation shape for spot illumination.

Further, in the in-vehicle illumination device 1 of the present embodiment, the movable mirror control unit 13 controls the direction of the movable mirror 12 as follows in the spot illumination. That is, the movable mirror control unit 13 changes the direction of the movable mirror 12 so that it is projected onto a part Ar1 on the upper surface of the dashboard, a part Ar2 on the floor in front of the seat, or a part Ar3 on the ground under the opened door 22. Control. These parts are all easily spotted by the passenger and are suitable as spot illumination parts. The light from the laser projector 11 is laser light and has a deep focal depth. For this reason, even if an image is projected on the above-mentioned plurality of parts having different optical path lengths from the laser projector 11, a focus shift can be suppressed. That is, according to the vehicle-mounted illumination device 1 of the present embodiment, spot illumination with fine irradiation expression can be performed on a plurality of parts that are easily noticeable by the passenger as described above.

Further, in the in-vehicle lighting device 1 of the present embodiment, a character image is projected onto a part Ar1 on the upper surface of the dashboard, a part Ar3 on the floor in front of the seat, or a part Ar3 on the ground below the door 22. Thereby, it is possible to display various information on a part that is easily noticeable to the passenger as described above.

The movable mirror 12 may be driven by a generally known polar coordinate system (r, θ) mechanism or an orthogonal coordinate system (x, y) mechanism.

Next, an in-vehicle illumination device according to a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment described above in that the movable mirror is a half mirror. Hereinafter, the second embodiment will be described by paying attention to differences from the first embodiment, and the description of the same points will be omitted.

FIG. 7 is a schematic diagram showing the in-vehicle illumination device of the second embodiment. In FIG. 2, the same reference numerals as those in FIG. 1 are given to components equivalent to the components of the in-vehicle lighting device 1 of the first embodiment shown in FIG. 1. A duplicate description of elements is omitted.

In the in-vehicle lighting device 4 of the second embodiment, the movable mirror 41 is a half mirror. A fixed mirror 42 is disposed in front of the movable mirror 41 in the traveling direction D2 of the automobile 2. The fixed mirror 42 reflects the light transmitted through the movable mirror 41 and is fixed to the ceiling 21 in such a direction that the light is applied to the ceiling 21 side.

FIG. 7 shows a state in which spot illumination is performed on a part Ar1 on the upper surface of the dashboard by direct light L3 in the in-vehicle illumination device 4 of the present embodiment. Since the movable mirror 41 is a half mirror, a part of the projection light of the laser projector 11 is reflected by the movable mirror 41 and projected onto a part Ar1 on the upper surface of the dashboard, but the rest is transmitted through the movable mirror 41. Then head to the fixed mirror 42. This transmitted light is reflected by the fixed mirror 42 and irradiated on the ceiling 21 side. And it is absorbed and diffusely reflected by the interior member 21a of the ceiling 21, and becomes the second indirect light L4 to illuminate the entire interior of the vehicle.

Needless to say, the in-vehicle lighting device 4 of the second embodiment can also reduce the cost and complexity of operation as in the in-vehicle lighting device 1 of the first embodiment described above. .

Furthermore, in the in-vehicle illumination device 4 of the present embodiment, the movable mirror 41 is a half mirror, and light is applied to the ceiling 21 side in the vehicle interior and a part of the portion lower than the ceiling 21 in the vehicle interior. Thereby, it is possible to perform overall illumination with the second indirect light L4 at the same time as performing spot illumination.

It should be noted that the above-described two embodiments are merely representative forms of the present invention, and the present invention is not limited to these embodiments. That is, those skilled in the art can implement various modifications in accordance with conventionally known knowledge without departing from the scope of the present invention. Of course, such modifications are also included in the scope of the present invention as long as the configuration of the in-vehicle lighting device of the present invention is provided.

For example, in the two embodiments described above, a laser projector 11 (laser light source), a movable mirror 12 (mirror), and a movable mirror control unit 13 (control means) are provided as examples of the in-vehicle illumination device according to the present invention. The vehicle-mounted illumination device 1 which became a separate body is illustrated. However, the vehicle-mounted illumination device according to the present invention is not limited to this, and for example, a laser light source, a mirror, and a control unit may be housed in one case and integrated. .

Further, for example, in the two embodiments described above, as an example of the in-vehicle illumination device according to the present invention, the projection light from the laser projector 11 (laser light source) is immediately reflected by the movable mirror 12 (mirror) to the projection site. The in-vehicle lighting device 1 heading toward is illustrated. However, the vehicle-mounted illumination device according to the present invention is not limited to this, and for example, projection light from a laser light source may be guided to a projection site by a plurality of mirrors including a movable mirror.

Further, for example, in the two embodiments described above, as an example of the in-vehicle illumination device according to the present invention, the in-vehicle illumination device 1 in which pure spot illumination is performed only on a part Ar4 on the seat is illustrated. Yes. However, the in-vehicle illumination device according to the present invention is not limited to this, and for example, pure spot illumination may be performed on part Ar1 on the upper surface of the dashboard.

Further, for example, in the two embodiments described above, as an example of the in-vehicle illumination device according to the present invention, the in-vehicle illumination device 1 in which a part Ar4 on the seat is removed as a spot illumination part for information service is provided. Illustrated. However, the in-vehicle lighting device according to the present invention is not limited to this, and for example, a part of the spot lighting for information service and Ar4 on the seat may be added.

Further, for example, in the two embodiments described above, as an example of the in-vehicle illumination device according to the present invention, the in-vehicle illumination device 1 in which spot illumination is performed on the front seat side in the vehicle interior is illustrated. However, the vehicle-mounted illumination device according to the present invention is not limited to this, and for example, spot illumination may be performed on the rear seat side of the vehicle interior.

Further, for example, in the above-described two embodiments, the interior member 21a subjected to graining is illustrated as an example of the light absorbing member referred to in the present invention. However, the light absorbing member referred to in the present invention is not limited to this. For example, the light absorbing member is provided separately from the interior member 21a of the ceiling 21 and has desired absorptivity and diffusibility, and the indirect light intensity is set to a desired intensity. It may be a member for controlling.

Also, for example, in the two embodiments described above, the movable mirror control unit 13 that performs biaxial rotation control with respect to the movable mirror 12 is illustrated as an example of the control means according to the present invention. However, the control means referred to in the present invention is not limited to this, and may be, for example, one that performs rotation control of one axis, or one that performs rotation control of three or more axes. May be.

Further, for example, in the two embodiments described above, as an example of the in-vehicle illumination device according to the present invention, the in-vehicle illumination device 1 that changes the light irradiation direction by moving only the movable mirror 12 (mirror) is illustrated. . However, the vehicle-mounted illumination device according to the present invention is not limited to this, and for example, the laser light source may be moved together with the mirror to change the light irradiation direction.

1,3,4 In-

vehicle lighting device

11,31

Laser projector

12,32,41

Movable mirror

13,33 Movable mirror control unit 21 Ceiling 21a Interior member 42 Fixed mirror Ar1 Part of dashboard top surface Ar2 Floor in front of seat Part Ar3 Part of the ground under the open door Ar4 Part of the seat

Claims

A laser light source installed in the passenger compartment;
A mirror that reflects light from the laser light source;
Control means for controlling the orientation of the mirror with respect to the light irradiation direction;
With
The in-vehicle illuminating device, wherein the control means controls the direction of the mirror so that the light is irradiated to a ceiling side in the vehicle interior.
The in-vehicle lighting device according to claim 1, wherein the ceiling is provided with a light absorbing member that absorbs a part of the irradiated light.
The in-vehicle illumination device according to claim 1, wherein the control unit controls the direction of the mirror so that the light is irradiated to a part of a portion lower than the ceiling inside and outside the vehicle interior. .
The in-vehicle lighting device according to claim 3, wherein the laser light source projects an image drawn using a dot matrix.
The in-vehicle illumination device according to claim 4, wherein the laser light source includes a plurality of light emitting elements that emit light in different colors.
The in-vehicle illumination device according to claim 4, wherein the laser light source changes an irradiation area of the light by changing an area of an image drawn using the dot matrix.
The in-vehicle illumination device according to claim 4, wherein the laser light source changes an irradiation shape of the light by changing a shape of an image drawn using the dot matrix.
The in-vehicle use according to claim 4, wherein the portion irradiated with light is a part of an upper surface of a dashboard, a part of a floor in front of a seat, or a part of the ground under an open door. Lighting device.
The in-vehicle lighting device according to claim 8, wherein a character image is projected on a part of an upper surface of the dashboard, a part of the floor in front of the seat, or a part of the ground.
The said mirror is a half mirror, The said light is irradiated to the ceiling side in the said vehicle interior, and a part of part lower than the said ceiling inside the said vehicle interior, The light of Claim 9 characterized by the above-mentioned. In-vehicle lighting device.