JP2016068629A - On-vehicle illuminator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an on-vehicle illuminator which has a configuration of using a laser light source for a light source part and is capable of easily adjusting illuminance patterns.SOLUTION: An on-vehicle illuminator of this invention comprises a light source part including a laser light source, a plurality of hologram elements into which laser light emitted from the laser light source is entered, and a control part that controls the strength of laser light. At least a part of the plurality of hologram elements have mutually different pieces of information recorded, which reproduce patterns with mutually different illuminances on incidence of laser light. The control part controls the strength of laser light entered into each of the plurality of hologram elements, thereby enabling a change in synthetic illuminance patterns reproduced into an irradiation target region by the synthesis of illuminance patterns.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an in-vehicle light source device, and more particularly to an in-vehicle light source device including a light source unit that emits laser light.

  For example, Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique of generating white light by combining laser beams emitted from semiconductor lasers of R, G, and B colors and using the white light as an in-vehicle light source device.

  In addition, the light distribution (illuminance pattern) emitted from the in-vehicle light source device has a certain standard defined by the standard. For example, Patent Document 2 below discloses a technique in which information for realizing an illuminance pattern that satisfies this light distribution standard is recorded in a hologram element in advance, and laser light is irradiated onto the hologram element. .

JP 2013-125893 A JP 2012-146621 A

  In an in-vehicle illuminating device, it may be required to realize an illuminance pattern according to a situation, for example, switching between a high beam and a low beam. However, the technique of Patent Document 2 is a configuration in which an illuminance pattern recorded in advance is reproduced, and the illuminance pattern cannot be changed depending on the situation. In addition to switching between the high beam and the low beam, for example, when a pedestrian crosses, it is difficult to cope with a complicated change in illuminance pattern in which the illuminance is increased toward the pedestrian.

  In view of the above problems, an object of the present invention is to realize an in-vehicle illumination device that uses a laser light source for a light source unit and can easily adjust an illuminance pattern.

The in-vehicle lighting device of the present invention is
A light source unit including a laser light source;
A plurality of hologram elements to which laser light emitted from the light source unit is incident;
A control unit for controlling the intensity of the laser beam,
At least some of the plurality of hologram elements have different information recorded therein, and when the laser beam is incident, the illumination target areas are reproduced with different illumination patterns,
The control unit controls the intensity of the laser light incident on each of the plurality of hologram elements, so that the combined illuminance pattern that is synthesized and reproduced in the irradiation target region can be changed. It is comprised by these.

  The on-vehicle illumination device includes a plurality of hologram elements that can reproduce different illuminance patterns, and is configured to change the intensity of laser light incident on each hologram element. For example, it is assumed that the irradiation target area is divided into a plurality of small areas, and the hologram elements that illuminate the small areas are different for each small area. At this time, the intensity of the laser light incident on each hologram element is changed so that the illumination is weakened or not illuminated at all for a small area, and is illuminated at a high intensity for another small area. By doing so, it is possible to freely adjust the combined illuminance pattern reproduced in the irradiation target region.

  Each of the plurality of hologram elements may be recorded with different information, and some of the hologram elements may be recorded with the same information.

  Incidentally, as described above, in an in-vehicle lighting device, for example, in a headlamp, an illuminance pattern (light distribution) that is a reference to be realized in front of a predetermined distance is determined. That is, there is a rule (standard) that the portion should not be too bright or too dark.

  Here, in the case of emitting laser light directly as a headlamp, in view of realizing the illuminance pattern required by the standard, the energy density of the laser light is high, so that it is directly visible to the human eye. Then, there is a concern that the image is formed on the retina and affects the human body. However, according to the above configuration, the laser light is once incident on the hologram element, and the irradiation target region is irradiated with the diffracted light emitted from the hologram element. Since the size of the hologram element is sufficiently larger than the size of the laser light source, the energy density of the diffracted light is lowered even when the laser light is directly used. Thereby, the another effect that the bad influence with respect to a human body can be avoided is also show | played.

  When laser light is incident on the hologram element, the incident angle of the laser light on the hologram element is 30 ° or more so as to minimize the amount of transmitted light and specularly reflected light directly emitted to the outside. More preferably, it is about 40 ° or less. In addition, the said vehicle-mounted illuminating device is good also as a structure provided with the light-shielding member for light-shielding the said transmitted light and the said regular reflection light, and it is good also as a thing provided with a light-diffusion member. In the latter case, the light diffused by the light diffusing member can be used as light for vehicle decoration.

In addition to the above features, the in-vehicle lighting device has
An external environment acquisition unit for inputting a control signal corresponding to the external environment to the control unit;
The controller is
According to the control signal, information on the intensity of the laser beam to be incident on each of the plurality of hologram elements is stored,
When the control signal is input from the external environment acquisition unit, the intensity of the laser light incident on each of the plurality of hologram elements is controlled based on the stored information to enter the external environment. It is another feature that the composite illuminance pattern corresponding thereto is reproduced in the irradiation target area.

  As the external environment acquisition unit, for example, an imaging device, a vehicle speed sensor, a steering angle sensor, an illuminance sensor, a radar, or the like mounted on a conventional automobile can be used. The external environment acquisition unit may be composed of one or more of these.

  For example, when the external environment acquisition unit is configured by a radar, when an obstacle such as a person or an animal is detected by the radar, a control signal indicating that the obstacle exists at a specific location ahead is output to the control unit. In this case, the event that an obstacle is detected corresponds to the “external environment”.

  Upon receiving this control signal, the control unit controls the intensity of each laser beam based on the stored information in order to realize a combined illuminance pattern that increases the illuminance at the location where the obstacle exists. More specifically, the control unit performs control such as increasing the intensity of the laser light incident on the hologram element that illuminates the area where the illuminance is to be increased, higher than the laser light incident on the hologram element illuminating the other area. Do. Thereby, the illuminance pattern (synthetic illuminance pattern) reproduced in the irradiation target area is automatically changed according to the external environment.

  The light source unit may include a different laser light source corresponding to each of the plurality of hologram elements. In this case, the laser light emitted from each laser light source is incident only on the hologram element assigned to the laser light source.

  On the other hand, it is also possible to adopt a configuration in which laser light emitted from the same laser light source is incident on a plurality of hologram elements. In this case, it is possible to employ a configuration in which an optical member that changes the traveling direction of the laser light is provided, and the hologram elements that are the targets of the laser light are sequentially changed by controlling the optical member.

That is, the in-vehicle lighting device has the above-described features,
An optical member disposed between the light source unit and the plurality of hologram elements;
The optical member sequentially changes the hologram element to which the laser light is incident from among the plurality of hologram elements by sequentially changing the traveling direction of the laser light emitted from the light source unit. Is another feature.

  As this optical member, for example, a polygon mirror, a galvano scanner, a rotary oscillating mirror, a refractive index modulation type scanner, or the like can be used. Here, as the rotation oscillating mirror, a circular mirror attached to the motor so that the normal vector of the reflecting surface is inclined at a predetermined angle with respect to the rotation axis of the motor can be used. The refractive index modulation type scanner is a scanner using an electro-optic effect. When the optical member is formed of a polygon mirror, the hologram element to be irradiated can be changed by changing the position on the surface of the polygon mirror where the laser beam is incident.

  Here, the control unit may change the intensity of the laser light in synchronization with the timing at which the optical member changes the traveling direction of the laser light. For example, when the optical member is composed of a polygon mirror, the control unit controls the rotation speed of the polygon mirror, or information on the rotation start location, rotation speed, and elapsed time of the polygon mirror is input to the control unit. Thus, the control unit can recognize the position on the surface of the polygon mirror where the laser beam is incident at each time. When the position on the surface of the polygon mirror on which the laser beam is incident is changed, the incident angle of the laser beam on the polygon mirror is changed, so that the traveling direction of the laser beam reflected by the polygon mirror is changed. Therefore, by arranging a plurality of hologram elements in advance so that the laser beam is incident on different hologram elements according to the reflection angle at the polygon mirror, the hologram element on which the laser beam is incident at each time can be obtained. Be controlled.

  In other words, the control unit can recognize the timing at which the hologram element on which the laser beam reflected by the polygon mirror is incident is switched, and the control unit controls the intensity of the laser beam at this timing, so that each hologram element is controlled. The intensity of the incident laser beam can be adjusted. Similarly, when the optical member is configured by other than a polygon mirror, the control unit can recognize the timing at which the laser beam is incident on each hologram element. The intensity of the laser beam incident on each hologram element can be adjusted.

The light source unit includes a semiconductor laser element that emits colors of R, G, and B,
The controller may be configured to change the intensity of the laser beam emitted from the semiconductor laser element for each color.

  By adopting such a configuration, it is possible to adjust not only the combined illuminance pattern to be reproduced in the irradiation target area but also the color temperature thereof. Therefore, laser light emitted from the same semiconductor laser element can be used, for example, for both a headlamp and a winker.

The in-vehicle lighting device is
An optical fiber that guides the laser light emitted from the light source unit;
Another feature is that the laser light emitted from the optical fiber is incident on the plurality of hologram elements.

  In a conventional in-vehicle lighting device, a light source for a headlight is disposed in the vicinity of the engine room. However, according to said structure, since a laser light source can be kept away from the engine room used as a heat source, the lifetime of a laser light source can be extended.

  According to the vehicle-mounted illumination device of the present invention, since the illuminance pattern can be easily adjusted while using the laser light source for the light source unit, a highly flexible illumination device can be realized.

It is a block diagram which shows typically the structure of one Embodiment of a vehicle-mounted illuminating device. It is a block diagram which shows typically an example of a structure of a light source part. It is typical drawing for demonstrating an example of the synthetic | combination illumination intensity pattern reproduced | regenerated in an irradiation object area | region. It is typical drawing for demonstrating an example of the synthetic | combination illumination intensity pattern reproduced | regenerated in an irradiation object area | region. It is a block diagram which shows typically the structure of another one Embodiment of a vehicle-mounted illuminating device.

  FIG. 1 is a block diagram schematically showing a configuration of an embodiment of an in-vehicle lighting device according to the present invention. The in-vehicle lighting device 1 includes a light source unit 2, a plurality of hologram elements 3 (3a, 3b, 3c,...), A control unit 4, an external environment acquisition unit 5, an optical fiber 6, and an optical member 7. Moreover, the vehicle-mounted illuminating device 1 is provided with lens systems, such as the collimating lens 8 and a condensing lens, as needed.

  FIG. 2 is a block diagram schematically illustrating an example of the configuration of the light source unit 2. The light source unit 2 includes a laser element 2R that emits red laser light, a laser element 2G that emits green laser, and a laser element 2B that emits blue laser. Each of the laser elements (2R, 2G, 2B) can be composed of a semiconductor laser element. Laser light emitted from each laser element (2R, 2G, 2B) is collimated by collimating lenses (31, 32, 33) as necessary, and then synthesized by dichroic mirrors (34, 35). Is output as white light.

  Returning again to FIG. 1, the white laser light emitted from the light source unit 2 enters the optical fiber 6 and then propagates through the optical fiber 6. Then, after this laser beam is emitted from the optical fiber 6, it enters the optical member 7 through the collimator lens 8. Hereinafter, the laser light emitted from the optical fiber 6 is appropriately referred to as “laser light 20”.

  The optical member 7 has a configuration that can sequentially change the traveling direction of the laser light 20. In the present embodiment, a case where the optical member 7 is configured by a polygon mirror will be described as an example. The polygon mirror is also called a rotary polygon mirror, and has a large number of mirror surfaces provided parallel or inclined to the rotation axis. By rotating the polygon mirror, the angle at which the laser beam 20 is incident on the mirror surface changes each time. As the incident angle of the laser beam 20 changes, the traveling direction of the reflected laser beam changes. Therefore, the traveling direction of the laser beam 20 can be sequentially changed by the polygon mirror.

  The optical member 7 is not limited to a polygon mirror as long as the traveling direction of the laser light 20 can be changed sequentially, and a galvano scanner, a rotating and oscillating mirror, a refractive index modulation scanner, or the like is also used. You can also.

  The in-vehicle illumination device 1 includes a plurality of hologram elements 3 (3a, 3b, 3c,...), And a hologram on which the laser light 20 is incident according to the traveling direction of the laser light 20 changed by the optical member 7. Element 3 (3a, 3b, 3c,...) Is adjusted. In the following description, when a plurality of hologram elements (3a, 3b, 3c,...) Are collectively described, they are referred to as “hologram elements 3” as appropriate. 3a, 3b, 3c, ...) ".

  Each hologram element (3a, 3b, 3c,...) Records information different from each other. When the laser beam 20 is incident, the illuminance based on the recorded information in a predetermined area within the irradiation target area 11 Play the pattern. Each hologram element (3a, 3b, 3c,...) Can be configured using an inorganic material or an organic material such as a photopolymer.

  The hologram elements 3 may be integrated by connecting the hologram elements (3a, 3b, 3c,...), Or the hologram elements (3a, 3b, 3c,...) Are separated from each other. It doesn't matter. Further, among the hologram elements (3a, 3b, 3c,...), A hologram element in which the same information is recorded in part may be included.

  The optical member 7 realizes a function of switching at high speed the hologram elements (3a, 3b, 3c,...) To which the laser light 20 is incident by rotating at high speed. When the laser beam 20 is incident on each hologram element 3, an illuminance pattern based on information recorded on the hologram element 3 is formed in a predetermined area within the irradiation target area 11 based on information recorded on the hologram element 3. Play. Since the hologram element (3a, 3b, 3c,...) To which the laser beam 20 is incident is switched in a short time by the optical member 7, the illuminance reproduced by the plurality of hologram elements 3 on the irradiation target region 11 A combined illuminance pattern obtained by combining the patterns is visually recognized. For example, the optical member 7 may be realized in a time of about 1/70 seconds or less for scanning the incidence of the laser beam 20 on all the hologram elements 3. In general, the blinking condition that cannot be recognized by the human eye is 70 Hz or more. Therefore, by switching the scanning time to about 1/70 seconds or less as described above, switching of each illuminance pattern is not visually recognized. Visible as a combined illumination pattern.

  Here, the composite illuminance pattern will be described with reference to FIGS. 3 and 4 are schematic diagrams for explaining an example of the combined illuminance pattern reproduced in the irradiation target region 11.

  For example, the small region 11a in the irradiation target region 11 is a region that is reproduced by the hologram element 3a when the laser beam 20 is incident on the hologram element 3a. Similarly, the small region 11b in the irradiation target region 11 is a region that is reproduced by the hologram element 3b when the laser beam 20 is incident on the hologram element 3b, and the small region 11c is the laser beam 20 on the hologram element 3c. This is a region that is reproduced when is incident.

  In the example of FIG. 3, the irradiation target area 11 is divided into 30 small areas. Here, the in-vehicle illumination device 1 includes 30 hologram elements (3a, 3b, 3c,...), And each hologram element (3a, 3b, 3c,...) Is in a different small area in the irradiation target area 11. Assume that diffracted light is illuminated. At this time, if the laser light 20 is incident on all the hologram elements 3, all the small areas in the irradiation target area 11 are illuminated, while the laser light 20 must be incident on all the hologram elements 3. The small areas in the irradiation target area 11 are not illuminated.

  Here, FIG. 4 is a diagram showing an example of a certain combined illuminance pattern, in which (a) corresponds to an example of an illuminance pattern for a low beam, and (b) corresponds to an example of an illuminance pattern for a high beam.

  For example, when it is desired to realize an illuminance pattern for a low beam, the laser beam 20 is incident on the hologram element 3 (for example, the hologram elements 3a and 3b) scheduled to illuminate a small area surrounded by a solid line, This is realized by not allowing the laser light 20 to enter the hologram element 3 (for example, the hologram element 3c) that is to illuminate the enclosed small region.

  More specifically, the control unit 4 sets the output of the light source unit 2 to a predetermined value in the time zone in which the traveling direction of the laser beam 20 is toward the hologram element 3 where the laser beam needs to be incident, In the time zone in which the traveling direction of the laser beam 20 is toward the hologram element 3 that does not require the laser beam to be incident, the control unit 4 sets the output of the light source unit 2 to be significantly lower than the predetermined value or Set the output to zero.

  The controller 4 may be able to recognize which hologram element 3 is incident with the laser beam 20 in each time zone. When the optical member 7 is composed of a polygon mirror, each hologram is previously set so that the reflected light of the laser beam 20 is incident on different hologram elements (3a, 3b, 3c,...) According to the reflection angle at the polygon mirror. Elements (3a, 3b, 3c,...) Are arranged. For example, if the control unit 4 is configured to recognize the timing of switching the surface of the polygon mirror on which the laser beam 20 is incident and the rotation speed of the polygon mirror, the laser beam 20 is incident at each time zone. It is possible to recognize which hologram element 3 is.

  In the present embodiment, the in-vehicle lighting device 1 includes an external environment acquisition unit 5. The external environment acquisition unit 5 outputs a predetermined control signal corresponding to the external environment to the control unit 4, and the control unit 4 adjusts the light intensity of the light source unit 2 so as to obtain a combined illuminance pattern based on the control signal. To do.

  As an example, the external environment acquisition unit 5 may include a speed sensor. In this case, when it is determined that the speed sensor is faster than the predetermined speed, the external environment acquisition unit 5 outputs a control signal to that effect to the control unit 4. When a control signal indicating high speed is input to the control unit 4, the light source is set so that the combined illuminance pattern obtained in the irradiation target region 11 has a predetermined high beam shape as shown in FIG. 4B, for example. The light intensity of part 2 is adjusted. Similarly, when the speed sensor determines that the speed is lower than the speed, based on the control signal input from the external environment acquisition unit 5, the control unit 4 displays the composite illuminance pattern obtained in the irradiation target region 11. For example, the light intensity of the light source unit 2 is adjusted so as to obtain a predetermined low beam as shown in FIG.

  With this configuration, when the speed of the vehicle is high, the headlamp automatically switches to a high beam and can automatically pay attention to oncoming vehicles and pedestrians located far away. .

  The control unit 4 may store in advance what kind of composite illuminance pattern should be generated in the irradiation target region 11 in accordance with the control signal input from the external environment acquisition unit 5.

  In the above example, the external environment acquisition unit 5 is configured to include a speed sensor, and the case where the combined illuminance pattern obtained in the irradiation target region 11 is changed according to the speed detected by the speed sensor has been described. This is merely an example, and various modes are possible.

  As another example, the external environment acquisition unit 5 may include an illuminance sensor that detects illuminance outside the vehicle. For example, based on the control signal from the illuminance sensor, the control unit 4 can control the irradiation target region 11 to be in a non-illuminated state when the illuminance outside the vehicle is equal to or lower than a predetermined illuminance. In this case, more specifically, it can be realized by controlling the light output of the light source unit 2 to zero or almost zero by the control unit 4. By adopting such a configuration, the headlamp can be automatically turned on when the illuminance falls below a certain level, such as the moment when the vehicle enters the tunnel during daytime driving or at sunset.

  As another example, the external environment acquisition unit 5 may be configured to include a steering angle sensor, or may be configured to include a radar or an imaging device. In the former example, the control unit 4 adjusts the light output of the light source unit 2 based on the control signal from the external environment acquisition unit 5, for example, the handle is cut in the irradiation target region 11. It is possible to realize a composite illuminance pattern that increases the illuminance of the side region. In the latter example, the control unit 4 adjusts the light output of the light source unit 2 based on the control signal from the external environment acquisition unit 5, for example, in the irradiation target region 11, such as radar or imaging. It is possible to realize a composite illuminance pattern in which the illuminance of a region on the side where an obstacle such as a pedestrian or an animal detected by the device is high is increased.

  According to the in-vehicle lighting device 1 of the present embodiment described above, the control unit 4 performs the timing at which the laser beam 20 is incident on each of the plurality of hologram elements (3a, 3b, 3c,...). By controlling the intensity of the laser light 20, that is, the light output of the light source unit 2, the illuminance pattern (combined illuminance pattern) obtained in the irradiation target region 11 can be changed. That is, compared with the conventional in-vehicle illumination device, the in-vehicle illumination device 1 of the present invention can greatly improve the degree of freedom of changing the illuminance pattern obtained in the irradiation target region 11, that is, the light distribution.

  In particular, the in-vehicle lighting device 1 has a configuration in which the light distribution can be changed by adjusting the light output of the light source unit 2 based on the control signal from the external environment acquisition unit 5 by the control unit 4. Appropriate lighting according to the external environment that changes from moment to moment is possible.

  In the in-vehicle illumination device 1 according to the present embodiment, R, G, and B laser beams emitted from the laser elements (2R, 2G, and 2B) provided in the light source unit 2 are guided by the optical fiber 6. The light emitted from the optical fiber 6 enters the plurality of hologram elements 3 through the optical member 7. Then, the diffracted light by the hologram element 3 illuminates the irradiation target region 11. That is, for example, it is possible to arrange the hologram element 3 in a place where a conventional vehicle headlamp was present and arrange the light source unit 2 in a place away from this place.

  Although the conventional vehicle headlamp is in the vicinity of the engine room, according to the above configuration, the light source unit 2 can be installed at a position away from the engine room. The laser element may change its optical characteristics or deteriorate its life characteristics due to heat. According to the above configuration, when the light source unit 2 includes the laser element, the light source unit 2 is an engine that is a heat source. There is also an advantage that it can be arranged away from the room.

[Another embodiment]
Hereinafter, another embodiment will be described.

  <1> In the above-described embodiment, the control unit 4 adjusts the output of the light source unit 2 based on the control signal, and adjusts the illuminance for each small region (11a,...) In the irradiation target region 11, It was assumed that the composite illuminance pattern obtained in the irradiation target area 11 was controlled. Here, the control unit 4 may adjust the color temperatures of R, G, and B of the light source unit 2 based on the control signal. More specifically, the control unit 4 may adjust the light output for each color for each laser element (2R, 2G, 2B) included in the light source unit 2 based on the control signal. .

  By adopting such a configuration, the in-vehicle illumination device 1 can adjust the color temperature in addition to the adjustment of the composite illuminance pattern in the irradiation target region 11, and therefore, for example, the headlamp and the blinker light source are the same. The light source unit 2 can be realized. In this embodiment, at least one of the hologram elements (3a, 3b, 3c,...) Stores information for illuminating the irradiation target area 11 as a blinker.

  It is assumed that the external environment acquisition unit 5 includes detection means for acquiring a turn signal instruction from the driver. At this time, when the control unit 4 recognizes that there is an instruction from the winker based on the control signal from the external environment acquisition unit 5, the laser light 20 is incident on the hologram element assumed to function as a winker. At the timing, control is performed to increase the output of the laser element 2R and the laser element 2G and decrease the output of the laser element 2B. As a result, the blinker is lit with an illuminance that is more orange than the headlamp. Thereafter, at the timing when the laser beam 20 is incident on the hologram element assumed to function as a headlamp, control is performed to lower the outputs of the laser elements 2R and 2G and increase the output of B.

  Next, all light outputs of the laser element 2R, the laser element 2G, and the laser element 2B are set to zero or almost zero at a timing when the laser light 20 is incident on the hologram element assumed to function as a winker. Thereby, the blinker is turned off. Thereafter, at the timing when the laser beam 20 is incident on the hologram element assumed to function as a headlamp, control is performed to lower the outputs of the laser elements 2R and 2G and increase the output of the laser element 2B.

  Hereinafter, while the control signal indicating that the driver has instructed the turn signal is being input to the control unit 4, by repeating such control, the headlight and the turn signal of the turn signal in which the predetermined illumination pattern is realized A composite illumination pattern consisting of blinking is reproduced in the irradiation target area 11. In this example, the light output is alternately turned on / off every cycle at the timing when the laser beam 20 is incident on the hologram element assumed to function as a winker. Alternatively, on / off control of the light output may be performed.

  Here, the case where the light source unit 2 serves as both the headlight and the light source of the winker has been described. .

  <2> FIG. 5 is a block diagram schematically illustrating a configuration of another embodiment of the in-vehicle lighting device. The in-vehicle lighting device 1a shown in FIG.

  In the embodiment described above with reference to FIG. 1, the optical element 7 controls the traveling direction of the laser light, so that the hologram element (3a) to which the laser light emitted from one light source unit 2 is incident is entered. , 3b, 3c, ...). On the other hand, like the vehicle-mounted illumination device 1a shown in FIG. 5, the number of light source units 2 (2a, 2b, 2c,...) Corresponding to each hologram element (3a, 3b, 3c,. The unit 4 may be configured to be able to control the light output for each light source unit (2a, 2b, 2c,...). In this case, as shown in FIG. 5, the in-vehicle lighting device 1 a does not necessarily include the optical member 7.

  <3> In the above embodiment, a part of hologram elements (3a, 3b, 3c,...) Form different illuminance patterns in the same small area within the irradiation target area 11. Information may be recorded.

  <4> In the above embodiment, the in-vehicle lighting device (1, 1a) does not necessarily have to include the external environment acquisition unit 5. In this case, it can be set as the structure which the control part 4 determines a synthetic | combination illumination intensity pattern based on the signal input by the driver | operator or the passenger.

DESCRIPTION OF SYMBOLS 1, 1a: In-vehicle illuminating device 2: Light source part 3 (3a, 3b, 3c ...): Hologram element 4: Control part 5: External environment acquisition part 6: Optical fiber 7: Optical member 8: Collimating lens 11: Irradiation object Areas 11a, 11b, 11c,...: Small areas in the irradiation target area 20: Laser light 31, 32, 33: Collimate lenses 34, 35: Dichroic mirror

Claims (6)

A light source unit including a laser light source;
A plurality of hologram elements to which laser light emitted from the light source unit is incident;
A control unit for controlling the intensity of the laser beam,
At least some of the plurality of hologram elements have different information recorded therein, and when the laser beam is incident, the illumination target areas are reproduced with different illumination patterns,
The control unit controls the intensity of the laser light incident on each of the plurality of hologram elements, so that the combined illuminance pattern that is synthesized and reproduced in the irradiation target region can be changed. It is comprised in the vehicle-mounted illuminating device characterized by the above-mentioned. An external environment acquisition unit for inputting a control signal corresponding to the external environment to the control unit;
The controller is
According to the control signal, information on the intensity of the laser beam to be incident on each of the plurality of hologram elements is stored,
When the control signal is input from the external environment acquisition unit, the intensity of the laser light incident on each of the plurality of hologram elements is controlled based on the stored information to enter the external environment. The in-vehicle illumination device according to claim 1, wherein the combined illuminance pattern corresponding to the irradiation target region is reproduced. An optical member disposed between the light source unit and the plurality of hologram elements;
The optical member sequentially changes the hologram element to which the laser light is incident from among the plurality of hologram elements by sequentially changing the traveling direction of the laser light emitted from the light source unit. The in-vehicle illuminating device according to claim 1 or 2.   The in-vehicle illumination device according to claim 3, wherein the control unit changes the intensity of the laser light in synchronization with a timing at which the optical member changes a traveling direction of the laser light. The light source unit includes a semiconductor laser element that emits colors of R, G, and B,
5. The in-vehicle illumination device according to claim 3, wherein the control unit is configured to change an intensity of the laser light emitted from the semiconductor laser element for each color. An optical fiber that guides the laser light emitted from the light source unit;
The on-vehicle illumination device according to claim 1, wherein the laser light emitted from the optical fiber is incident on the plurality of hologram elements.

Images