JP2020044999A - Vehicular lighting fixture - Google Patents

Abstract

To provide a vehicular lighting fixture capable of suppressing feeling of discomfort.SOLUTION: A head lamp 1 includes: a phase modulation section 53 which modulates the phase of light from a light source 51; image sensors 82R, 82G, and 82B which receive light emitted from the phase modulation section 53; and a control section 71. The image sensors 82R, 82G, and 82B receive image-forming light. The control section 71 acquires light which is emitted from the phase modulation section 53 controlled so that the phase distribution of the emitted light becomes first phase distribution and is received by the image sensors 82R, 82G, and 82B as a first image, calculates a second image, calculates second phase distribution, acquires light which is emitted from the phase modulation section 53 controlled so that the phase distribution of the emitted light becomes the second phase distribution as a third image and is received by the image sensor, calculates a fourth image, calculates third phase distribution, calculates fourth phase distribution in which random phase distribution is imparted to the third phase distribution, and defines the fourth phase distribution as the first phase distribution.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular lamp having a phase modulation element.

  As a vehicle lamp, a vehicle headlight represented by an automobile headlight, a drawing device that draws an image on a road surface, and the like are known. By the way, various configurations have been studied in order to make a projected image in a vehicle lamp into a desired image.

  Patent Literature 1 below discloses a near-eye device that projects an image using a spatial modulation element that is a type of a phase modulation element that modulates the phase of incident light and diffracts and emits the incident light. It is conceivable to use such a spatial modulation element for a vehicle lamp.

JP 2006-519790 A

  The image projected by the spatial modulation element of Patent Document 1 is an image corresponding to the phase distribution of light emitted from the spatial modulation element. For this reason, it is necessary to obtain a phase distribution such that a desired image is projected, and to control the spatial modulation element so that the light emitted from the spatial modulation element has the phase distribution. In the near-eye apparatus of Patent Document 1, this phase distribution is calculated using an iterative Fourier transform method. However, in the iterative Fourier transform method, the calculation of the Fourier transform and the inverse Fourier transform is repeated many times until the calculation result converges, so that the calculation time tends to be long. For this reason, there is a concern that the time required to project a desired image will be long.

  Accordingly, an object of the present invention is to provide a vehicular lamp that can reduce the time required to project a desired image.

  In order to achieve the above object, a vehicular lamp of the present invention includes a light source that emits light, and a plurality of two-dimensionally arranged dots into which light from the light source enters, and sets the phase of the incident light to the plurality of dots. A phase modulation unit that modulates each dot, an image sensor that receives a part of light emitted from the phase modulation unit, and a control unit. Receiving, the control unit controls the phase modulation unit so that a phase distribution of light emitted from the phase modulation unit becomes a first phase distribution, and the first control process is performed. A first image acquisition process for acquiring the partial light emitted from the phase modulation unit and received by the image sensor as a first image, and a second image for calculating a second image obtained by bringing the first image closer to a target image An image calculation process, and a luminance component of the second image A second phase distribution calculation process of calculating a second phase distribution obtained by converting a phase distribution into a phase distribution, and a second phase distribution controlling process that controls the phase modulation unit so that a phase distribution of light emitted from the phase modulation unit becomes the second phase distribution. 2 control processing; third image acquisition processing for acquiring, as a third image, the part of light emitted from the phase modulation unit and subjected to the second control processing and received by the image sensor; A fourth image calculation process for calculating a fourth image in which the pixel array of the fourth image is transposed, a third phase distribution calculation process for calculating a third phase distribution obtained by converting a luminance distribution of the fourth image into a phase distribution, Calculating a fourth phase distribution in which a random phase distribution is added to the three phase distributions, and replacing the fourth phase distribution with the first phase distribution. Calculate phase distribution It is characterized in.

  In such a vehicle lamp, as described above, the phase modulation unit modulates the phase of the light from the light source for each of a plurality of dots, so that the light whose phase distribution is modulated is emitted from the phase modulation unit. Since the lights having different phases interfere with each other and are diffracted, the light emitted from the phase modulation unit is diffracted according to the phase distribution of the light. Therefore, by controlling the phase modulation unit by the control unit and adjusting the phase distribution of the light emitted from the phase modulation unit, the diffraction of the light emitted from the phase modulation unit can be controlled, and the light emitted from the phase modulation unit can be controlled. The light to be emitted can be light for projecting a desired image. For this reason, in this vehicle lamp, the control unit calculates a target phase distribution which is a phase distribution of light emitted from the phase modulation unit and projecting a target image.

  Specifically, as described above, the control unit performs the first control process, the first image acquisition process, the second image calculation process, the second phase distribution calculation process, the second control process, and the third control process. A phase distribution generation process including an image acquisition process, a fourth image calculation process, a third phase distribution calculation process, and a replacement process performs an iterative Fourier transform of the phase distribution of light to obtain a target phase corresponding to the target image. Calculate the distribution.

  In the first image acquisition process, the control unit emits light from the phase modulation unit controlled so that the phase distribution of the light emitted from the phase modulation unit becomes the first phase distribution by the first control process, and the image sensor receives the light. Light is acquired as a first image. As described above, since the image sensor receives the formed light, the first image is an image formed by forming the light emitted from the phase modulation unit. Here, it is known that an image obtained by imaging light is an image obtained by performing a Fourier transform on the phase distribution of the light. For this reason, this first image is generally an image obtained by Fourier-transforming the first phase distribution. Therefore, in this vehicular lamp, the calculation of the Fourier transform of the first phase distribution is omitted by using the Fourier transform effect generated by imaging light.

  The control unit calculates a second image in which the first image obtained by the first image obtaining process is closer to the target image in the second image calculating process, and calculates the luminance distribution of the second image in the second phase distribution calculating process. Is converted to a phase distribution to calculate a second phase distribution. The conversion of the luminance distribution into the phase distribution is performed by proportionally converting each luminance of the luminance distribution of the second image into a phase by a predetermined coefficient, and calculating a remainder when each phase is divided by 2π. It is an operation of replacing the remainder with the corresponding luminance.

  In the third image acquisition process, the control unit emits light from the phase modulation unit controlled so that the phase distribution of the light emitted from the phase modulation unit by the second control process becomes the second phase distribution, and the image sensor receives the light. Light is acquired as a third image. In the fourth image calculation process, a fourth image obtained by transposing the pixel array of the third image is calculated. Here, it is known that an image obtained by transposing an image obtained by imaging light is an image obtained by performing an inverse Fourier transform on the phase distribution of the light. Therefore, the fourth image is an image obtained by performing an inverse Fourier transform on the second phase distribution. Therefore, in this vehicular lamp, a part of the calculation of the inverse Fourier transform of the second phase distribution is omitted by using the Fourier transform effect generated by imaging light.

  The control unit calculates a third phase distribution obtained by converting the luminance distribution of the fourth image into a phase distribution in the third phase distribution calculation process, and assigns a random phase distribution to the third phase distribution in the replacement process. A fourth phase distribution is calculated, and the fourth phase distribution is set as a first phase distribution. As the control unit repeats each of the above processes, the second image approaches the target image including the luminance, and the phase distribution of light that projects such a second image is calculated. The conversion of the luminance distribution into the phase distribution is performed in the same manner as in the above-described second phase distribution calculation process by proportionally converting each luminance of the luminance distribution of the fourth image into a phase by a predetermined coefficient, and converting each phase by 2π. The remainder is calculated when the division is performed, and the calculated remainder is replaced with the corresponding luminance.

  As described above, in this vehicular lamp, a part of the calculation of the Fourier transform and the calculation of the inverse Fourier transform in the iterative Fourier transform of the phase distribution of the light are omitted by using the Fourier transform effect generated by imaging light. ing. Therefore, this vehicle lamp can reduce the amount of calculation when calculating the target phase distribution and shorten the calculation time as compared with the case where the Fourier transform and the inverse Fourier transform in the iterative Fourier transform are performed by calculation. Therefore, the vehicle lamp can reduce the time required to project a desired image.

  The second image compares each pixel in the first image with each pixel in the target image, and calculates a brightness of each pixel in the first image from a brightness of a corresponding pixel in the target image. Alternatively, an image in which the luminance of a pixel larger than a predetermined value is replaced with a luminance smaller than the luminance may be determined.

  The wavelength band of the partial light may be at least a part of a wavelength band included in another partial light emitted from the phase modulation unit.

  The vehicle lamp may further include a Fourier transform lens that forms an image of the partial light.

  With this configuration, it is possible to stably form an image of a part of light emitted from the phase modulation unit.

  Alternatively, the control unit may control the phase modulation unit to form an image of the partial light emitted from the phase modulation unit.

  With such a configuration, it is possible to form an image of a part of the light emitted from the phase modulation unit without providing a Fourier transform lens or the like, and the vehicle lamp can have a simple configuration.

  In this case, the vehicular lamp may further include a projection lens that adjusts a divergence angle of another part of the light emitted from the phase modulation unit.

  Another part of the light emitted from the phase modulation unit propagates so as to diverge after being imaged. Since the divergence angle of the light is adjusted by the projection lens in the vehicle lamp, the light whose divergence angle is adjusted can be emitted to the outside of the vehicle. Therefore, the size of the image to be projected can be easily set to a desired size as compared with the case where no projection lens is provided.

  The image processing apparatus may further include a light splitting unit that splits the light emitted from the phase modulation unit into the partial light and the other partial light.

  With such a configuration, even if the light source does not have a light emitting element in which the emitted light is incident only on the image sensor, the image sensor can receive part of the light emitted from the phase modulation unit, The vehicular lamp may have a simple configuration.

  In this case, the spectroscopic unit may change a separation ratio of the part of the light with respect to the other part of the light, and may increase the separation ratio at least during the third image acquisition processing. good.

  The image formed by the light emitted from the phase modulation unit that is controlled such that the phase distribution of the light emitted from the phase modulation unit becomes the second phase distribution is significantly different from the target image. Therefore, when the phase modulation unit is controlled in this manner, an image that is significantly different from the target image is projected outside the vehicle. In such a vehicular lamp, in such a case, the light splitting unit increases the separation ratio of some light with respect to other light. For this reason, the intensity of the light emitted to the outside of the vehicle is reduced, and an image greatly different from the target image becomes less conspicuous, and it is possible to suppress a driver, a person outside the vehicle, and the like from feeling uncomfortable.

  In this case, the light source may adjust the intensity of the emitted light according to the change in the separation ratio.

  By increasing the separation ratio as described above, the intensity of light received by the image sensor is increased. In this vehicle lamp, as described above, the intensity of the emitted light is adjusted according to the change in the separation ratio. For this reason, the vehicular lamp can suppress an increase in the intensity of light received by the image sensor according to a change in the separation ratio, and can suppress a problem from occurring in the image sensor.

  The light source includes a plurality of light emitting elements, and the part of the light and the other part of the light are emitted from the separate light emitting elements, and the part of the light is combined with the other part of the light. The light may be received by the image sensor without being waved.

  With such a configuration, the intensity of light received by the image sensor and the intensity of light emitted to the outside of the vehicle can be individually adjusted. For this reason, for example, it becomes easy for the image sensor to receive light having an intensity corresponding to the performance of the image sensor, or to irradiate light having a desired intensity to the outside of the vehicle.

  In this case, the part of the light may not be emitted from the light emitting element when the control unit does not perform the phase distribution generation processing.

  With such a configuration, the power consumption of the light source can be reduced as compared with the case where the light source constantly emits some light.

  The light source has a plurality of light emitting elements, the phase modulation section has a plurality of phase modulation elements provided for each of the plurality of light emitting elements, and at least two of the light emitting elements emit light having different wavelength bands from each other. It is good to do.

  In this vehicular lamp, light of different wavelength bands is emitted from at least two light emitting elements, and light whose phase distribution is modulated is emitted from a phase modulation element corresponding to these light emitting elements. That is, light beams having different wavelength bands are emitted from at least two phase modulation elements. For this reason, this vehicle lamp can project an image of a desired color.

  In this case, the image sensor is provided for each of the at least two phase modulation elements respectively corresponding to the at least two light emitting elements that emit light having different wavelength bands, and the target image includes the at least two light emitting elements. And the control unit may calculate the target phase distribution by the phase distribution generation processing for each of the at least two light emitting elements.

  In this vehicular lamp, a target phase distribution is calculated by a phase distribution generation process for each of at least two phase modulation elements that emit light having different wavelength bands. For this reason, the control unit can control at least two phase modulation elements that emit light having different wavelength bands based on the respective target phase distributions. For this reason, this vehicular lamp can suppress the occurrence of color bleeding in the projected image. Further, the vehicular lamp can project an image composed of a plurality of colors.

  The light source has a plurality of light emitting elements, the phase modulation unit has at least one phase modulation element, and at least two of the light emitting elements emit light having different wavelength bands from each other, and have different wavelength bands from each other. The at least two light-emitting elements that emit light emit the light alternately for each light-emitting element, and the plurality of lights that emit from the at least two light-emitting elements enter a common phase modulation element. The phase modulation element on which the light from at least two light emitting elements is incident may modulate the phase of the light for each of the plurality of dots according to the wavelength band of the incident light.

  In this vehicle lamp, light having different wavelength bands is sequentially emitted from the phase modulation element on which light from at least two light emitting elements is incident. By the way, when light of different wavelength bands, that is, light of different colors is repeatedly irradiated with a cycle shorter than the temporal resolution of human vision, the human is irradiated with light in which the lights of different colors are combined by the afterimage phenomenon. Can be recognized. For this reason, when light having different wavelength bands is emitted from this phase modulation element at a period shorter than the time resolution of human vision, light emitted from this phase modulation element can be visually synthesized by humans. it can. Therefore, the vehicular lamp can project an image of a desired color by the light emitted from the phase modulation element. Further, in this vehicle lamp, since the phase modulation element that modulates the phase distribution of the light emitted from at least two light emitting elements can be a common phase modulation element, the number of components can be reduced.

  In this case, the image sensor is provided for the phase modulation element on which the light from the at least two light emitting elements is incident, and the target image is provided for each of the at least two light emitting elements; May calculate the target phase distribution by the phase distribution generation processing for each of the at least two light emitting elements.

  In this vehicle lamp, a target phase distribution is calculated for each of at least two light emitting elements that emit light having different wavelength bands. For this reason, the control unit can perform control in accordance with a common phase modulation element on which light emitted from at least two light emitting elements is incident and a wavelength band of light incident on the phase modulation element. For this reason, this vehicular lamp can suppress the occurrence of color bleeding in the projected image. Further, the vehicular lamp can project an image composed of a plurality of colors.

  As described above, according to the present invention, it is possible to provide a vehicular lamp that can reduce the time required to project a desired image.

It is a figure showing roughly the vehicular lamp in a 1st embodiment of the present invention. FIG. 2 is an enlarged view of the optical system unit shown in FIG. 1. FIG. 3 is a front view of the phase modulation element shown in FIG. 2. FIG. 4 is a diagram schematically showing a cross section in a thickness direction of a part of the phase modulation element shown in FIG. 3. 1 is a block diagram including a part of a vehicle lamp and a lamp control system according to a first embodiment of the present invention. It is a figure showing the example of the picture projected by the light emitted from the vehicular lamp in a 1st embodiment of the present invention. FIG. 4 is a diagram illustrating a control flowchart of a control unit according to the first embodiment of the present invention. FIG. 9 is a diagram illustrating a control flowchart of a control unit in a phase distribution generation process. It is a figure showing a vehicular lamp in a 2nd embodiment of the present invention similarly to FIG. It is an enlarged view of the optical system unit shown in FIG. It is a figure showing an optical system unit in a 3rd embodiment of the present invention like FIG. It is a figure showing an optical system unit in a 4th embodiment of the present invention like FIG. It is a figure showing an optical system unit in a 5th embodiment of the present invention like FIG.

  Hereinafter, embodiments for implementing a vehicular lamp according to the present invention will be exemplified with reference to the accompanying drawings. The embodiments illustrated below are for the purpose of facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved from the following embodiments without departing from the gist thereof.

(1st Embodiment)
FIG. 1 is a diagram illustrating a vehicle lamp according to the present embodiment, and is a diagram schematically illustrating a vertical cross section of the vehicle lamp. The vehicular lamp of the present embodiment is a headlamp 1 for an automobile. The headlights for automobiles are generally provided in each of the left and right directions in front of the vehicle, and the left and right headlights are configured substantially symmetrically in the left and right directions. Therefore, in this embodiment, one headlamp will be described. As shown in FIG. 1, the headlamp 1 of the present embodiment includes a housing 10 and a lamp unit 20 as main components.

  The housing 10 includes a lamp housing 11, a front cover 12, and a back cover 13 as main components. The front of the lamp housing 11 is open, and the front cover 12 is fixed to the lamp housing 11 so as to close the opening. An opening smaller than the front is formed behind the lamp housing 11, and the back cover 13 is fixed to the lamp housing 11 so as to close the opening.

  The space formed by the lamp housing 11, the front cover 12 closing the front opening of the lamp housing 11, and the back cover 13 closing the rear opening of the lamp housing 11 is a lamp room R. The lamp unit 20 is accommodated therein.

  The lamp unit 20 of the present embodiment mainly includes a heat sink 30, a cooling fan 40, a cover 59, and an optical system unit 50, and is fixed to the housing 10 by a configuration (not shown).

  The heat sink 30 has a metal base plate 31 extending in a substantially horizontal direction, and a plurality of heat radiation fins 32 are provided integrally with the base plate 31 on a lower surface side of the base plate 31. The cooling fan 40 is arranged with a gap from the radiating fin 32 and is fixed to the heat sink 30. The heat sink 30 is cooled by the airflow generated by the rotation of the cooling fan 40. A cover 59 is arranged on the upper surface of the base plate 31 of the heat sink 30.

  The cover 59 is fixed on the base plate 31 of the heat sink 30. The cover 59 has a substantially rectangular shape, and is made of, for example, a metal such as aluminum. The optical system unit 50 is housed in the space inside the cover 59. An opening 59 </ b> H through which light emitted from the optical system unit 50 can be transmitted is formed at a front portion of the cover 59. In order to make the inner walls of the cover 59 have a light absorbing property, it is preferable that these inner walls are subjected to black alumite processing or the like. Since the inner wall of the cover 59 has a light absorbing property, even when the inner wall is irradiated with light due to unintended reflection or refraction, the irradiated light is reflected and emitted from the opening 59H in an unintended direction. Can be suppressed.

  FIG. 2 is an enlarged view of the optical system unit shown in FIG. In FIG. 2, the heat sink 30, the cover 59, and the like are omitted for easy understanding. As shown in FIG. 2, the optical system unit 50 of the present embodiment includes a light source 51, a phase modulation unit 53, a first light receiving optical system 54R, a second light receiving optical system 54G, and a third light receiving optical system 54B. , A combining optical system 55.

  The light source 51 of the present embodiment emits light in a predetermined wavelength band. That is, the light source 51 emits light of a plurality of wavelengths. Specifically, the light source 51 has three light emitting elements 51R, 51G, 51B and three collimating lenses 52R, 52G, 52B. The three light emitting elements 51R, 51G, and 51B are laser elements that emit laser beams in predetermined wavelength bands different from each other. In this embodiment, the light emitting element 51R emits red laser light having a peak power wavelength of, for example, 638 nm, the light emitting element 51G emits green laser light having a peak power wavelength of, for example, 515 nm, and the light emitting element 51B emits power. Emits blue laser light having a peak wavelength of, for example, 445 nm. For this reason, these light emitting elements 51R, 51G, and 51B emit light having different wavelength bands. The optical system unit 50 has a circuit board (not shown), and the light emitting elements 51R, 51G, and 51B are mounted on the circuit board.

  The collimator lens 52R is a lens that collimates the laser light emitted from the light emitting element 51R in the fast axis direction and the slow axis direction. The collimating lens 52G is a lens that collimates the laser beam emitted from the light emitting element 51G in the fast axis direction and the slow axis direction, and the collimating lens 52B is configured to collimate the laser beam emitted from the light emitting element 51B in the fast axis direction and the slow axis direction. It is a collimating lens. Instead of the collimating lenses 52R, 52G, and 52B, a collimating lens that collimates the laser beam in the fast axis direction and a collimating lens that collimates the slow axis direction may be separately provided.

  The phase modulation unit 53 of the present embodiment has three phase modulation elements 53R, 53G, 53B. Each of the phase modulation elements 53R, 53G, and 53B includes a plurality of two-dimensionally arranged dots, and is configured to modulate the phase of incident light for each of the plurality of dots. Are emitted from the respective phase modulation elements 53R, 53G, 53B. Since the lights having different phases interfere with each other and are diffracted, the lights emitted from the respective phase modulation elements 53R, 53G and 53B are diffracted according to the phase distribution of the light. Therefore, it can be understood that each of the phase modulation elements 53R, 53G, and 53B diffracts and emits the incident light. The phase modulation elements 53R, 53G, and 53B of the present embodiment are reflection-type phase modulation elements that modulate the phase distribution of light while reflecting incident light. For example, LCOS (Liquid), which is a reflection-type liquid crystal panel, is used. Crystal on Silicon).

  The phase modulation element 53R corresponds to the light emitting element 51R, the phase modulation element 53G corresponds to the light emitting element 51G, and the phase modulation element 53B corresponds to the light emitting element 51B. That is, these phase modulation elements 53R, 53G, 53B are provided for each of the light emitting elements 51R, 51G, 51B of the light source 51. The red laser light emitted from the light emitting element 51R and collimated by the collimating lens 52R is incident on the phase modulation element 53R, and the phase modulation element 53R is a first light DLR that modulates the phase distribution of the red laser light. Is emitted. The green laser light emitted from the light emitting element 51G and collimated by the collimating lens 52G is incident on the phase modulation element 53G, and the phase modulation element 53G modulates the phase distribution of the green laser light. Is emitted. The blue laser light emitted from the light emitting element 51B and collimated by the collimating lens 52B enters the phase modulation element 53B, and the phase modulation element 53B modulates the phase distribution of the blue laser light into a third light DLB. Is emitted. Therefore, the wavelength bands of the lights DLR, DLG, and DLB emitted from the phase modulation unit 53 are the same as the wavelength bands of the light emitted from the light source 51.

  The first light receiving optical system 54R is provided for the phase modulation element 53R, and includes a spectral unit 80R, a Fourier transform lens 81R, and an image sensor 82R. The light splitting unit 80R splits the first light DLR emitted from the phase modulation element 53R into some light and some other light. Part of the light separated by the light splitting unit 80R enters the Fourier transform lens 81R, and part of the other light exits from the first light receiving optical system 54R. For this reason, the light emitted from the first light receiving optical system 54R is a part of the first light DLR emitted from the phase modulation element 53R, and this light is also referred to as the first light DLR below. As the light splitting unit 80R, for example, a prism type beam splitter, a plane type beam splitter, a wedge substrate, and the like are given. The light separation ratio in the light splitting unit 80R of the present embodiment is fixed.

  The Fourier transform lens 81R is a lens that forms an image of a part of the light separated by the light splitting unit 80R. The Fourier transform lens 81R of the present embodiment is a lens in which the entrance surface and the exit surface are formed in a convex shape.

  The image sensor 82R is an optical element that converts light received on the light receiving surface into an electric signal and outputs the electric signal. The image sensor 82R has a plurality of light receiving units that receive light, and outputs light incident on the light receiving surface as a two-dimensional image. . The image sensor 82R is arranged such that the light receiving surface is located at or near the focal point of the Fourier transform lens 81R, and receives light formed by the Fourier transform lens 81R. Examples of the image sensor 82R include a CCD (Charge Coupled Device) image sensor and a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

  The second light receiving optical system 54G is provided for the phase modulation element 53G, and includes a spectral unit 80G, a Fourier transform lens 81G, and an image sensor 82G. The third light receiving optical system 54B is provided for the phase modulation element 53B, and includes a spectral unit 80B, a Fourier transform lens 81B, and an image sensor 82B. The light splitting unit 80G separates the second light DLG emitted from the phase modulation element 53G into a part of light and another light, and the light splitting unit 80B outputs the third light DLB emitted from the phase modulation element 53B. Into some light and some other light. As the light splitting units 80G and 80B, for example, similar to the light splitting unit 80R, a prism type beam splitter, a plane type beam splitter, a wedge substrate, and the like are given. Part of the light separated by the light splitting unit 80G enters the Fourier transform lens 81G, and part of the other light exits from the second light receiving optical system 54G. Further, a part of the light separated by the light splitting unit 80B enters the Fourier transform lens 81B, and another part of the light exits from the third light receiving optical system 54B. Therefore, the light emitted from the second light receiving optical system 54G is a part of the second light DLG emitted from the phase modulation element 53G, and the light emitted from the third light receiving optical system 54B is emitted from the phase modulation element 53B. It is a part of the third light DLB to be emitted. Hereinafter, light emitted from the second light receiving optical system 54G is also referred to as a second light DLG, and light emitted from the third light receiving optical system 54B is also referred to as a third light DLB. In the present embodiment, the light separation ratio in the light splitting units 80G and 80B is constant.

  The Fourier transform lens 81G is a lens that forms an image of a part of the light separated by the spectral unit 80G, and the Fourier transform lens 81B is a lens that forms an image of a part of the light that is separated by the spectral unit 80B. These Fourier transform lenses 81G and 81B of the present embodiment are lenses having an incident surface and an exit surface formed in a convex shape.

  Each of the image sensors 82G and 82B is an optical element that converts light received on the light receiving surface into an electric signal and outputs the electric signal, similarly to the image sensor 82R. Each of the image sensors 82G and 82B has a plurality of light receiving units for receiving light, and outputs light incident on the light receiving surface as a two-dimensional image. The image sensor 82G is arranged so that the light receiving surface is located at or near the focal point of the Fourier transform lens 81G, and receives light formed by the Fourier transform lens 81G. The image sensor 82B is arranged so that the light receiving surface is located at or near the focal point of the Fourier transform lens 81B, and receives light formed by the Fourier transform lens 81B. Examples of the image sensors 82G and 82B include, for example, a CCD image sensor, a CMOS image sensor, and the like, like the above-described image sensor 82R.

  The combining optical system 55 has a first optical element 55f and a second optical element 55s. The first optical element 55f is an optical element that combines the first light DLR emitted from the first light receiving optical system 54R and the second light DLG emitted from the second light receiving optical system 54G. In the present embodiment, the first optical element 55f combines the first light DLR and the second light DLG by transmitting the first light DLR and reflecting the second light DLG. Further, the second optical element 55s is an optical element that combines the first light DLR and the second light DLG combined by the first optical element 55f and the third light DLB emitted from the third light receiving optical system 54B. Element. In the present embodiment, the second optical element 55 s transmits the first light DLR and the second light DLG combined by the first optical element 55 f and reflects the third light DLB to form the first light DLR. The DLR, the second light DLG, and the third light DLB are combined. As such a first optical element 55f and a second optical element 55s, there can be mentioned a wavelength selection filter in which an oxide film is laminated on a glass substrate. By controlling the type and thickness of the oxide film, it is possible to transmit light having a wavelength longer than a predetermined wavelength and reflect light having a wavelength shorter than this wavelength.

  Thus, the first light DLR, the second light DLG, and the third light DLB are combined in the combining optical system 55, and this light is emitted from the combining optical system 55. In FIGS. 1 and 2, the first light DLR is indicated by a solid line, the second light DLG is indicated by a broken line, and the third light DLB is indicated by a dashed line. These lights DLR, DLG, and DLB It is shown staggered.

  Next, the configurations of the phase modulation element 53R, the phase modulation element 53G, and the phase modulation element 53B included in the phase modulation section 53 will be described in detail.

  In the present embodiment, the phase modulation element 53R, the phase modulation element 53G, and the phase modulation element 53B have the same configuration. Therefore, the phase modulation element 53R will be described below, and the description of the phase modulation element 53G and the phase modulation element 53B will be appropriately omitted.

  FIG. 3 is a front view of the phase modulation element shown in FIG. In FIG. 3, a region 51A where the laser beam emitted from the collimator lens 52R is incident is shown by a broken line. The phase modulation element 53R has a rectangular outer shape, and has a plurality of modulators two-dimensionally arranged in the rectangle, and each modulator modulates the phase distribution of light incident on the modulator. Then, light whose phase distribution is modulated is emitted. Each modulating section includes a plurality of two-dimensionally arranged dots. This modulator is formed so as to be located at least one in a region 51A where the laser light emitted from the collimator lens 52R is incident. As shown in FIG. 3, a driving circuit 60R is electrically connected to the phase modulation element 53R. The driving circuit 60R includes a scanning line driving circuit connected to the side of the phase modulation element 53R and a phase modulation element. A data line driving circuit connected to one side of the element 53R in the up-down direction.

  FIG. 4 is a diagram schematically showing a cross section in a thickness direction of a part of the phase modulation element shown in FIG. As shown in FIG. 4, the phase modulation element 53R of the present embodiment mainly includes a silicon substrate 62, a drive circuit layer 63, a plurality of electrodes 64, a reflection film 65, a liquid crystal layer 66, a transparent electrode 67, and a light-transmitting substrate 68. It is provided as a simple configuration.

  The plurality of electrodes 64 are two-dimensionally arranged on one surface side of the silicon substrate 62 so as to correspond to the respective dots DT of the modulation section. The drive circuit layer 63 is a layer in which circuits connected to the scan line drive circuit and the data line drive circuit of the drive circuit 60R shown in FIG. 3 are arranged, and is arranged between the silicon substrate 62 and the plurality of electrodes 64. You. The translucent substrate 68 is arranged on one side of the silicon substrate 62 so as to face the silicon substrate 62, and is, for example, a glass substrate. The transparent electrode 67 is disposed on the surface of the light transmitting substrate 68 on the silicon substrate 62 side. The liquid crystal layer 66 has liquid crystal molecules 66 a and is arranged between the plurality of electrodes 64 and the transparent electrode 67. The reflection film 65 is disposed between the plurality of electrodes 64 and the liquid crystal layer 66, and is, for example, a dielectric multilayer film. Laser light emitted from the collimator lens 52R enters from the surface of the translucent substrate 68 opposite to the silicon substrate 62 side.

  As shown in FIG. 4, light L entering from a surface of the light-transmitting substrate 68 opposite to the silicon substrate 62 side passes through the transparent electrode 67 and the liquid crystal layer 66, is reflected by the reflection film 65, and is reflected by the liquid crystal layer 66. The light passes through the transparent electrode 67 and is emitted from the light-transmitting substrate 68. Here, when a voltage is applied between the specific electrode 64 and the transparent electrode 67, the orientation of the liquid crystal molecules 66a of the liquid crystal layer 66 located between the electrode 64 and the transparent electrode 67 changes, and The refractive index of the liquid crystal layer 66 located between the first electrode 64 and the transparent electrode 67 changes. Since the orientation of the liquid crystal molecules 66a changes according to the applied voltage, the refractive index also changes according to this voltage. Since the optical path length of the light L passing through the liquid crystal layer 66 changes as described above by changing the refractive index of the liquid crystal layer 66, the light transmitted through the liquid crystal layer 66 and emitted from the phase modulation element 53R changes. The phase can be changed. As described above, since the plurality of electrodes 64 are arranged corresponding to each dot DT of the modulation section, the voltage applied between the electrode 64 corresponding to each dot DT and the transparent electrode 67 is controlled. This modulates the phase of the light emitted from each dot DT. By adjusting the refractive index of the liquid crystal layer 66 in each dot DT in this way, the phase modulating element 53R modulates the phase of light emitted from the dot DT, and emits light having a modulated phase distribution. As described above, since the lights having different phases interfere with each other and are diffracted, the light emitted from the phase modulation element 53R is diffracted according to the phase distribution of the light. For this reason, the phase modulation element 53R adjusts the refractive index of the liquid crystal layer 66 in each dot DT to control the phase distribution of the emitted light, thereby making the light distribution pattern a desired light distribution pattern, For example, the region irradiated with light can be changed.

  In the present embodiment, the phase modulation element 53R modulates the phase of the light in each dot DT such that the phase distribution of the light emitted from each modulation unit in the phase modulation element 53R has the same phase distribution. Further, the phase modulation element 53G modulates the phase of light in each dot DT such that the phase distribution of light emitted from each modulation section in the phase modulation element 53G has the same phase distribution. Further, the phase modulation element 53B modulates the phase of the light in each dot DT such that the phase distribution of the light emitted from each modulation section in the phase modulation element 53B has the same phase distribution. Then, the light distribution pattern of the light emitted from the modulation unit is modulated by modulating the phase of the light in each dot DT such that the phase distribution of the light emitted from the modulation unit becomes the phase distribution of the light of the desired light distribution pattern. A desired light distribution pattern can be obtained.

  FIG. 5 is a block diagram including a part of the vehicle lamp and the lamp control system according to the present embodiment. As shown in FIG. 5, in the lamp control system 70 of the present embodiment, the drive circuits 60R, 60G, 60B, the power circuits 61R, 61G, 61B, the target image generation unit 73, the light switch 74, the storage unit 75, and the image sensor 82R. , 82G, 82B, etc., are electrically connected to the control unit 71, and the detection device 72 is electrically connected to the target image generation unit 73. The control unit 71 may be provided in the lamp unit 20 and may be a part of the electronic control device of the vehicle.

  Drive circuit 60G is electrically connected to phase modulation element 53G, and drive circuit 60B is electrically connected to phase modulation element 53B. Similarly to the drive circuit 60R, the drive circuits 60G and 60B include a scanning line drive circuit connected to the side of the phase modulation elements 53G and 53B, and data connected to one side of the phase modulation elements 53R and 53B in the vertical direction. A line drive circuit. The drive circuits 60R, 60G, and 60B adjust the voltages applied to the dots DT of the phase modulation elements 53R, 53G, and 53B, respectively, based on the signal input from the control unit 71. The phase modulation elements 53R, 53G, 53B adjust the refractive index of the liquid crystal layer 66 in each dot DT according to the voltage applied by the drive circuits 60R, 60G, 60B. In this embodiment, each dot is set such that the phase distribution of the light emitted from each of the modulation units in the phase modulation elements 53R, 53G, and 53B becomes the target phase distribution calculated by the later-described phase distribution generation processing of the control unit 71. The refractive index of the liquid crystal layer 66 in DT is adjusted.

  In the present embodiment, the target phase distribution is calculated for each of the phase modulation elements 53R, 53G, 53B. The respective target phase distributions include a first light DLR that is a part of light emitted from the phase modulation element 53R, a second light DLG that is a part of light emitted from the phase modulation element 53G, and a phase modulation element. The third light DLB, which is a part of the light emitted from 53B, has a phase distribution in which a desired light distribution pattern is formed by the light combined by the combining optical system 55. This desired light distribution pattern includes a luminance distribution. For this reason, in the present embodiment, when a specific light distribution pattern is formed by light obtained by combining lights DLR, DLG, and DLB, which are parts of light emitted from the phase modulation elements 53R, 53G, and 53B, the light DLR, Each of DLG and DLB overlaps with the specific light distribution pattern and has an intensity distribution based on the intensity distribution of the specific light distribution pattern. Further, at a portion where the intensity is high in the light distribution pattern formed by the light obtained by combining the light DLR, DLG, and DLB, the light DLR, DLG, and DLB that are a part of the light emitted from the phase modulation elements 53R, 53G, and 53B. Also increase in strength.

  As shown in FIGS. 1 and 2, a first light DLR that is a part of light emitted from the phase modulation element 53R, a second light DLG that is a part of light emitted from the phase modulation element 53G, The third light DLB, which is a part of light emitted from the phase modulation element 53B, is combined by the combining optical system 55. The combined light exits from the opening 59H of the cover 59 and exits from the headlight 1 via the front cover 12. This light is a light obtained by combining a part of the light emitted from each of the phase modulation elements 53R, 53G, 53B based on the target phase distribution of each of the phase modulation elements 53R, 53G, 53B. Is a light distribution pattern based on these target phase distributions.

  The power supply circuit 61R is electrically connected to the light emitting element 51R, the power supply circuit 61G is electrically connected to the light emitting element 51G, and the power supply circuit 61B is electrically connected to the light emitting element 51B. A power supply (not shown) is connected to these power supply circuits 61R, 61G, and 61B. Each of the power supply circuits 61R, 61G, and 61B adjusts the power supplied from the power supply to the light emitting elements 51R, 51G, and 51B based on the signal input from the control unit 71, and emits the light from the light emitting elements 51R, 51G, and 51B. The intensity of the laser light to be adjusted. Note that the power supply circuits 61R, 61G, and 61B may adjust the power supplied to the light emitting elements 51R, 51G, and 51B by PWM (Pulse Width Modulation) control. In this case, by adjusting the duty cycle, the intensity of the laser light emitted from these light emitting elements 51R, 51G, 51B is adjusted.

  The detection device 72 detects a predetermined target object located in front of the vehicle. Examples of the object detected by the detection device 72 include a vehicle such as a preceding vehicle and an oncoming vehicle, a pedestrian, and a sign. In addition, as a configuration of the detection device 72, for example, a configuration including a camera, an image processing unit, a detection unit, and the like, which are not illustrated, may be mentioned. The camera photographs the front of the vehicle, and an image photographed by the camera includes at least a part of an area irradiated with light emitted from the headlight 1. The image processing unit performs image processing on an image captured by the camera. The detection unit detects the presence of the target and the position of the target from the information processed by the image processing unit. When the detection device 72 detects a predetermined target object located in front of the vehicle, the detection device 72 sends information on the presence of the target object and the position of the target object to the target image generation unit 73. The location of the object is, for example, a relative position of the object with respect to a light distribution pattern of light emitted from the headlight 1 on a vertical plane at a predetermined distance from the vehicle. The area where the object is located is also included. It should be noted that the objects detected by the detection device 72, the number of types of the objects, and the configuration of the detection device 72 are not particularly limited. For example, the detection device 72 may be configured to detect the presence and the position of the target object in a non-contact manner using, for example, a millimeter wave radar or an infrared radar instead of the camera. A combination of a radar and an infrared radar may be used to detect the presence and location of the target without contacting the target.

  The target image generation unit 73 calculates an image projected by light emitted from the headlight 1 based on information on the position of the target object detected by the detection device 72, and controls the information regarding the image. 71. In the present embodiment, the target image generator 73 calculates a target image projected by the headlight 1 based on an image captured by a camera (not shown) of the detection device 72. Then, the first target image that is a red component image, the second target image that is a green component image, and the third target image that is a blue component image of the target image are output to the control unit 71 as target image information. I do. That is, it can be understood that the target image generation unit 73 provides a target image for each of the light emitting elements 51R, 51G, and 51B that emit light having different wavelength bands. In the present embodiment, the target image generation unit 73 causes the headlight 1 to project an image of a light distribution pattern in which at least a part of a region overlapping with the detected target in the light distribution pattern of the high beam is darkened. Calculate as an image.

  The light switch 74 is a switch for instructing the driver to emit or not emit light from the headlight 1. For example, when the light switch 74 is turned on, the light switch 74 outputs a signal instructing projection of an image from the headlight 1.

  The storage unit 75 stores information on a predetermined image projected by the headlight 1. Specifically, the predetermined image of the present embodiment is an image of a light distribution pattern of a high beam. Then, a predetermined light phase distribution corresponding to the image of the high beam light distribution pattern is stored. Specifically, a first reference phase distribution that is a phase distribution of light emitted from the phase modulation element 53R, a second reference phase distribution that is a phase distribution of light emitted from the phase modulation element 53G, and a The third reference phase distribution, which is the phase distribution of the emitted light, is stored. The first reference phase distribution is a phase distribution of light emitted from the phase modulation element 53R such that the light emitted from the phase modulation element 53R has a light distribution pattern for projecting an image obtained by extracting a red component in a predetermined image. The second reference phase distribution is a phase distribution of light emitted from the phase modulation element 53G such that the light emitted from the phase modulation element 53G has a light distribution pattern that projects an image obtained by extracting a green component in a predetermined image. The third reference phase distribution is a phase distribution of light emitted from the phase modulation element 53B such that the light emitted from the phase modulation element 53B has a light distribution pattern for projecting an image obtained by extracting a blue component in a predetermined image.

  FIG. 6 is a diagram illustrating an example of an image projected by light emitted from the vehicle lamp according to the present embodiment. Specifically, FIG. 6A is a predetermined image stored in the storage unit 75, and is a diagram illustrating an image of a high-beam light distribution pattern. FIGS. 6B and 6C are target images calculated by the target image generator 73. FIG. 6B is a diagram showing an image of a light distribution pattern in which a specific region is darkened in the high beam light distribution pattern, and FIG. 6C is another specific region in the high beam light distribution pattern which is darkened. FIG. 3 is a diagram showing an image of a light distribution pattern. For easy understanding, in FIG. 6, in each image, a scene ahead of the vehicle when projecting the image is superimposed, S indicates a horizontal line, and a light distribution pattern is indicated by a thick line, This light distribution pattern is a light distribution pattern formed on a vertical plane 25 m away from the vehicle.

  The light distribution pattern PH of the high beam of the image shown in FIG. 6A is white. In the high beam light distribution pattern PH, the area LA1 has the highest luminance, and the luminance decreases in the order of the area LA2, the area LA3, and the area LA4.

  The light distribution pattern P1 of the image shown in FIG. 6B is a light distribution pattern in which a specific area AR1 in the high beam light distribution pattern PH is darkened. That is, the luminance of the specific area AR1 in the light distribution pattern P1 is lower than the luminance of the specific area AR1 in the high beam light distribution pattern PH. This specific area AR1 overlaps with the entire pedestrian PE detected as an object by the detection device 72. The luminance distribution in the light distribution pattern P1 other than the specific area AR1 is the same as the luminance distribution in the high beam light distribution pattern PH other than the area AR1. When the headlight 1 projects the image shown in FIG. 6B, the light of the light distribution pattern P1 is emitted, and it is possible to suppress the pedestrian PE from feeling dazzling light emitted from the headlight 1. .

  The light distribution pattern P2 of the image shown in FIG. 6C is a light distribution pattern in which another specific area AR2 different from the specific area AR1 in the high beam light distribution pattern PH is darkened. That is, the luminance of the specific area AR2 in the light distribution pattern P2 is lower than the luminance of light in the specific area AR2 in the high beam light distribution pattern PH. This specific area AR2 overlaps the entire oncoming vehicle OV detected as a target by the detection device 72. The luminance distribution in the light distribution pattern P2 other than the specific area AR2 is the same as the luminance distribution in the high beam light distribution pattern PH other than the area AR2. When the headlight 1 projects the image shown in FIG. 6 (C), the light of the light distribution pattern P2 is irradiated, and the driver of the oncoming vehicle OV feels dazzling light emitted from the headlight 1. Can be suppressed. In FIG. 6A, a specific area AR2 in the high beam light distribution pattern PH is indicated by a broken line. In the present embodiment, the specific area AR2 in the light distribution pattern P2 is located within the area LA2, and the light intensity of the specific area AR2 is lower than the intensity of the area LA2.

  Next, the operation of the headlight 1 of the present embodiment will be described. Specifically, an operation of changing the light distribution pattern of light emitted according to the situation in front of the vehicle from the high beam light distribution pattern PH to another light distribution pattern will be described. FIG. 7 is a diagram illustrating a control flowchart of the control unit according to the present embodiment.

  First, in step SP1, when the light switch 74 is turned on and a signal instructing light emission from the light switch 74 is input to the control unit 71, the control flow of the control unit 71 proceeds to step SP2. On the other hand, if this signal is not input to the control unit 71 in step SP1, the control flow of the control unit 71 proceeds to step SP6.

  In step SP2, if the detection device 72 does not detect a predetermined target located in front of the vehicle and information about the target image is not input to the control unit 71 from the target image generation unit 73, the control flow of the control unit 71 is step SP3. Proceed to. On the other hand, when this information is input to the control unit 71 in step SP2, the control flow of the control unit 71 proceeds to step SP4.

  In step SP3, the control unit 71 controls the phase modulation elements 53R, 53G, and 53B based on the predetermined light phase distribution corresponding to the image of the high beam light distribution pattern stored in the storage unit 75. Specifically, the control unit 71 outputs a signal based on this information to the drive circuits 60R, 60G, and 60B, and the drive circuits 60R, 60G, and 60B output a signal based on the signal input from the control unit 71 to the phase modulation element. The voltage applied to each of the dots DT of 53R, 53G, and 53B is adjusted. In this voltage, the phase distribution of the light emitted from the phase modulation element 53R becomes the first reference phase distribution, the phase distribution of the light emitted from the phase modulation element 53G becomes the second reference phase distribution, and the voltage is emitted from the phase modulation element 53B. The voltage is set so that the phase distribution of the emitted light becomes the third reference phase distribution. In addition, the control unit 71 outputs a predetermined signal to the power supply circuits 61R, 61G, and 61B, and the power supply circuits 61R, 61G, and 61B output light-emitting elements 51R, 51G, and 51 from the power supply based on the signal input from the control unit 71. A predetermined power is supplied to 51B. For this reason, the light emitting elements 51R, 51G, and 51B each emit laser light having a predetermined intensity. Laser light emitted from the light emitting elements 51R, 51G, 51B enters the corresponding phase modulation elements 53R, 53G, 53B, and light DLR, DLG, DLB is emitted from the phase modulation elements 53R, 53G, 53B. Some of these lights DLR, DLG, and DLB are combined by the combining optical system 55, and the combined light is emitted from the headlight 1. Here, since the phase distribution of the light emitted from the phase modulation elements 53R, 53G, 53B is set to be the reference phase distribution corresponding to the image of the high beam light distribution pattern PH, the white high beam light distribution pattern PH light is emitted from the headlight 1.

  In the present embodiment, in step SP3, the control unit 71 simultaneously controls the phase modulation elements 53R, 53G, 53B and the light emitting elements 51R, 51G, 51B. However, the control unit 71 may perform these controls sequentially.

  In step SP2, when the detection device 72 detects a predetermined target located in front of the vehicle and information regarding the target image is input from the target image generation unit 73 to the control unit 71, the control flow of the control unit 71 is step SP4. Proceed to. In step SP4, the control unit 71 performs a phase distribution generation process. The phase distribution generation processing is performed on each of the phase modulation element 53R, the phase modulation element 53G, and the phase modulation element 53B. In the present embodiment, the phase distribution generation processing for the phase modulation elements 53R, 53G, and 53B is the same processing. For this reason, the phase distribution generation processing for the phase modulation element 53R will be described below, and the description of the phase distribution generation processing for the phase modulation elements 53G and 53B will be omitted as appropriate.

  FIG. 8 is a diagram illustrating a control flowchart of the control unit in the phase distribution generation processing. As shown in FIG. 8, the phase distribution generation processing includes a first control processing, a first image acquisition processing, a second image calculation processing, a second phase distribution calculation processing, a second control processing, and a third image processing. It includes an acquisition process, a fourth image calculation process, a third phase distribution calculation process, and a replacement process. In the phase distribution generation processing, first, in step SP11, the control unit 71 controls the phase modulation element 53R such that the phase distribution of light emitted from the phase modulation element 53R becomes a predetermined first phase distribution as a first control processing. Control. Specifically, the control unit 71 outputs a signal to the drive circuit 60R based on a predetermined first phase distribution, and the drive circuit 60R outputs each signal of the phase modulation element 53R based on a signal input from the control unit 71. The voltages applied to the dots DT are respectively adjusted. This voltage is set so that the phase distribution of the light emitted from the phase modulation element 53R becomes a predetermined first phase distribution. Note that the predetermined first phase distribution is not particularly limited as long as it is a random phase distribution.

  Next, in step SP12, as the first image acquisition process, the control unit 71 acquires, as the first image, light emitted from the phase modulation element 53R subjected to the first control process and received by the image sensor 82R. Specifically, the control unit 71 outputs a predetermined signal to the power supply circuit 61R, and the power supply circuit 61R supplies predetermined power from the power supply to the light emitting element 51R based on the signal input from the control unit 71. For this reason, laser light of a predetermined intensity is emitted from the light emitting element 51R, this laser light is incident on the phase modulation element 53R, and light whose phase distribution is modulated is emitted from the phase modulation element 53R. The light emitted from the phase modulation element 53R is separated into a part of light and another part of light by the light splitting unit 80R, and the light separated by the light splitting unit 80R is imaged by the Fourier transform lens 81R. The imaged light is received by the image sensor 82R. The image sensor 82R converts the received light into an electric signal and outputs the electric signal to the control unit 71 as a two-dimensional image. Thus, the control unit 71 acquires the two-dimensional image output from the image sensor 82R as the first image. Here, it is known that an image obtained by imaging light is an image obtained by performing a Fourier transform on the phase distribution of the light. For this reason, the first image is an image obtained by performing a Fourier transform on a predetermined first phase distribution. Therefore, in the phase distribution generation processing, the Fourier transform operation of the first phase distribution is omitted by using the Fourier transform effect generated by imaging light.

  Next, in step SP13, the control unit 71 calculates, as a second image calculation process, a second image in which the first image acquired in step SP12 is brought closer to the first target image input from the target image generation unit 73. The first target image is a red component image of the image projected from the headlight 1 as described above. Specifically, the control unit 71 of the present embodiment determines that the number of pixels in the vertical direction of the first target image is the same as the number of pixels in the vertical direction of the first image, and the number of pixels in the horizontal direction of the first target image is Image processing is performed on the first image so that the number of pixels in the horizontal direction of the first image is the same. This image processing is not particularly limited. However, this image processing is image processing in which the image in the first image is not deformed. For example, image processing in which the image is enlarged or reduced, or image processing in which a part of the image is cut out to form a new image Alternatively, the image processing is a combination of these image processings. Note that this image processing may be omitted. For example, the number of pixels in the vertical direction of the first target image is equal to the number of pixels in the vertical direction of the first image, and the number of pixels in the horizontal direction of the first target image is equal to the number of pixels in the horizontal direction of the first image. This image processing can be omitted by using the image sensor 82R.

  Next, the control unit 71 of the present embodiment compares each pixel in the first image subjected to the image processing with each pixel in the first target image. Then, the control unit 71 determines that, among the luminances of the respective pixels in the first image on which the image processing has been performed, the luminance of a pixel that is higher than the luminance of the corresponding first target image by a predetermined value or more is smaller than the luminance. The image replaced with the luminance is calculated, and the calculated image is set as a second image. The outline of the image in the second image calculated in this way is closer to the outline of the image in the first target image than the outline of the image in the first image. In this way, the control unit 71 calculates an image in which the first image is brought closer to the first target image. The second image calculation process only needs to be able to calculate a second image in which the first image is close to the first target image, and the method of calculating the second image is not particularly limited.

  Next, in step SP14, as the second phase distribution calculation processing, the control unit 71 calculates a second phase distribution obtained by converting the luminance distribution of the second image calculated in step SP13 into a phase distribution. More specifically, the conversion of the luminance distribution into the phase distribution is performed by proportionally converting each luminance of the luminance distribution of the second image into a phase by a predetermined coefficient, and calculating a remainder when each phase is divided by 2π. , The calculated remainder is replaced with the corresponding luminance. Note that the luminance is converted, for example, so that each dot DT of the phase modulation element 53R is smaller than the maximum modulation amount that can modulate the phase of light.

  Next, in step SP15, as a second control process, the control unit 71 controls the phase modulation element 53R such that the phase distribution of the light emitted from the phase modulation element 53R becomes the second phase distribution calculated in step SP14. . Specifically, the control unit 71 outputs a signal to the drive circuit 60R based on the second phase distribution, and the drive circuit 60R outputs a signal to each of the dots DT of the phase modulation element 53R based on the signal input from the control unit 71. The voltage applied to each is adjusted. This voltage is such that the phase distribution of the light emitted from the phase modulation element 53R becomes the second phase distribution. On the emission surface of the phase modulation element 53R controlled in this way, an image substantially the same as the second image calculated by the second image calculation process is displayed. That is, displaying the second image calculated by the second image calculation process on the emission surface of the phase modulation element 53R can be understood as performing the second phase distribution calculation process and the second control process. In the present embodiment, in steps SP13 to SP15, laser light of a predetermined intensity is kept emitted from the light emitting element 51R. However, the laser light from the light emitting element 51R may not be emitted.

  Next, in step SP16, the control unit 71 acquires, as a third image, light emitted from the phase modulation element 53R subjected to the second control processing and received by the image sensor 82R as a third image. Since the laser light of the predetermined intensity is kept emitted from the light emitting element 51R, the laser light emitted from the light emitting element 51R enters the phase modulation element 53R, and the light whose phase distribution is modulated is The light exits from the phase modulation element 53R. When the laser light from the light emitting element 51R is not emitted, the control unit 71 causes the light emitting element 51R to emit a laser light having a predetermined intensity in the same manner as in step SP12. The light emitted from the phase modulation element 53R is separated into a part of light and another part of light by the light splitting unit 80R, and the light separated by the light splitting unit 80R is imaged by the Fourier transform lens 81R. The imaged light is received by the image sensor 82R. The image sensor 82R converts the received light into an electric signal and outputs the electric signal to the control unit 71 as a two-dimensional image. Thus, the control unit 71 acquires the two-dimensional image output from the image sensor 82R as the third image.

  Next, in step SP17, the control unit 71 calculates, as a fourth image calculation process, a fourth image in which the pixel array of the third image acquired in step SP16 is transposed. Here, it is known that an image obtained by transposing an image obtained by imaging light is an image obtained by performing an inverse Fourier transform on the phase distribution of the light. Therefore, the fourth image is an image obtained by performing an inverse Fourier transform on the second phase distribution. Therefore, in the phase distribution generation processing, a part of the calculation of the inverse Fourier transform of the second phase distribution is omitted by using the Fourier transform effect generated by imaging light.

  Next, in step SP18, the control unit 71 calculates a third phase distribution obtained by converting the luminance distribution of the fourth image calculated in step SP17 into a phase distribution, as a third phase distribution calculation process. Specifically, similarly to step SP14, the conversion of this luminance distribution into a phase distribution is performed by proportionally converting each luminance of the luminance distribution of the fourth image into a phase by a predetermined coefficient, and dividing each phase by 2π. In this case, the remainder is calculated, and the calculated remainder is replaced with the corresponding luminance. Note that the luminance is converted, for example, so that each dot DT of the phase modulation element 53R is smaller than the maximum modulation amount that can modulate the phase of light.

  Next, in step SP19, the control unit 71 calculates a fourth phase distribution in which a random phase distribution is added to the third phase distribution calculated in step SP18 as a replacement process, and returns to step SP11 to return to the fourth phase distribution. A first control process is performed using the distribution as a predetermined first phase distribution. Note that the random phase distribution is not particularly limited.

  As described above, when the processing from step SP11 to step SP19 is defined as one cycle, the control unit 71 performs this cycle a predetermined number of times. By performing this cycle a plurality of times, the first image acquired in step SP12 converges so as to approach the first target image input from the target image generation unit 73. The image obtained by further bringing the first image closer to the first target image further closer to the first target image is the second image, and the second phase distribution obtained by converting the luminance distribution of the second image into the phase distribution is substantially inverse Fourier transformed. The converted result is the third phase distribution. That is, the third phase distribution is a phase distribution that becomes an image approaching the first target image when the third phase distribution is subjected to inverse Fourier transform, and light having such a phase distribution is applied to an area that is separated by a predetermined distance or more. Accordingly, an image approaching the first target image is projected on the area. The control unit 71 of this embodiment sets the third phase distribution as the first target phase distribution for the phase modulation element 53R, and ends the phase distribution generation processing. In the present embodiment, a laser beam having a predetermined intensity is kept emitted from the light emitting element 51R in steps SP16 to SP19. However, the laser light from the light emitting element 51R may not be emitted.

  The control unit 71 performs the phase distribution generation processing for the phase modulation element 53G and the phase modulation element 53B at the same time as the phase distribution generation processing for the phase modulation element 53R, and the second target phase distribution and the phase modulation element for the phase modulation element 53G. A third target phase distribution for 53B is also calculated. Then, the control flow of the control unit 71 proceeds to step SP5.

  In step SP5, the control section 71 controls the phase modulation element 53R such that the phase distribution of the light emitted from the phase modulation element 53R becomes the first target phase distribution calculated in step SP4. Further, similarly to the phase modulation element 53R, the control unit 71 controls the phase modulation element 53R so that the phase distribution of the light emitted from the phase modulation element 53G becomes the second target phase distribution calculated in step SP4. The phase modulation element 53R is controlled such that the phase distribution of the light emitted from the modulation element 53B becomes the third target phase distribution calculated in step SP4. Specifically, the control unit 71 outputs signals to the driving circuits 60R, 60G, and 60B based on the first target phase distribution, the second target phase distribution, and the first target phase distribution, respectively. 60G and 60B respectively adjust the voltage applied to each dot DT of the phase modulation elements 53R, 53G and 53B based on the signal input from the control unit 71. The voltage applied to each dot DT of the phase modulation element 53R is such that the phase distribution of the light emitted from the phase modulation element 53R becomes the first target phase distribution. The voltage applied to each dot DT of the phase modulation element 53G is such that the phase distribution of the light emitted from the phase modulation element 53G becomes the second target phase distribution. The voltage applied to each dot DT of the phase modulation element 53B is a voltage such that the phase distribution of the light emitted from the phase modulation element 53B becomes the third target phase distribution. Since the laser light of a predetermined intensity is kept emitted from the light emitting elements 51R, 51G, 51B, the laser light emitted from the light emitting elements 51R, 51G, 51B enters the phase modulation elements 53R, 53G, 53B, respectively. I do. For this reason, light whose phase distribution becomes the first target phase distribution is emitted from the phase modulation element 53R, and light whose light phase distribution becomes the second target phase distribution is emitted from the phase modulation element 53G. The light whose phase distribution becomes the third target phase distribution is emitted from the phase modulation element 53B. The light emitted from the phase modulation element 53R is light that projects a first target image which is an image of a red component of the target image projected from the headlight 1, and the light emitted from the phase modulation element 53G is Light that projects a second target image, which is a green component image of the target image projected from the headlight 1, is emitted from the phase modulation element 53B. The light is used to project a third target image that is an image of a blue component. As shown in FIGS. 1 and 2, the light emitted from the phase modulation elements 53R, 53G, and 53B is partially separated from the other light by the spectral units 80R, 80G, and 80B, respectively. Is separated into Some of these lights separated by the light splitting units 80R, 80G, and 80B are received by the image sensors 82R, 82G, and 82B, respectively. The light is combined at 55 and emitted from the headlight 1 via the front cover 12.

  In this way, the target image calculated by the target image generator 73 is projected by the headlight 1. As illustrated in FIGS. 6B and 6C, in the target image calculated by the target image generation unit 73, at least a part of the region of the high beam light distribution pattern PH overlapping the target is dark. Since the light distribution pattern is an image of the light distribution pattern, the light of such a light distribution pattern is emitted from the headlight 1.

  As described above, when a signal instructing light emission from the light switch 74 is not input to the control unit 71 in step SP1 and the control flow of the control unit 71 proceeds to step SP6, the control unit 71 sets the light emitting elements 51R, By controlling 51G and 51B, the laser light from the light emitting elements 51R, 51G and 51B is not emitted. In this case, the power supply circuits 61R, 61G, and 61B stop supplying power from the power supply to the light emitting elements 51R, 51G, and 51B based on the signal input from the control unit 71. Therefore, the light emitting elements 51R, 51G, and 51B do not emit laser light, and the headlight 1 does not emit light.

  As described above, the headlight 1 of the present embodiment emits the light of the high-beam light distribution pattern PH when the detection device 72 does not detect a predetermined target located in front of the vehicle. On the other hand, when the detection device 72 detects a predetermined target object located in front of the vehicle, the headlight 1 has a light distribution pattern P1, P2 in which at least a part of the target object and a specific region to be darkened overlap. Emit light.

  As described above, the headlamp 1 of the present embodiment includes the light emitting elements 51R, 51G, 51B that emit light, the phase modulation elements 53R, 53G, 53B, the image sensors 82R, 82G, 82B, and the control unit. 71. The phase modulation elements 53R, 53G, 53B include a plurality of two-dimensionally arranged dots DT on which light from the light emitting elements 51R, 51G, 51B is incident, and modulate the phase of the incident light for each of the plurality of dots DT. . The image sensors 82R, 82G, and 82B receive a part of light emitted from the phase modulation elements 53R, 53G, and 53B. Part of the light emitted from the phase modulation elements 53R, 53G, and 53B forms an image, and the formed image of the light is received by the image sensors 82R, 82G, and 82B.

  The control unit 71 performs a first target phase distribution corresponding to a first target image that is a red component of the target image by a phase distribution generation process, a second target phase distribution corresponding to a second target image that is a green component of the target image, And a third target phase distribution corresponding to a third target image which is a blue component of the target image. The phase distribution generation process includes a first control process, a first image acquisition process, a second image calculation process, a second phase distribution calculation process, a second control process, a third image acquisition process, and a fourth image It includes a calculation process, a third phase distribution calculation process, and a replacement process. The first control process is a process of controlling the phase modulation elements 53R, 53G, 53B such that the phase distribution of the light emitted from the phase modulation elements 53R, 53G, 53B becomes the first phase distribution, respectively. The first image acquisition processing is a part of the light emitted from each of the phase modulation elements 53R, 53G, 53B subjected to the first control processing, and the part of the light received by the image sensors 82R, 82G, 82B respectively. This is a process of acquiring light as the first images. The second image calculation processing includes a second image in which the first image received by the image sensor 82R is closer to the first target image, and a second image in which the first image received by the image sensor 82G is closer to the second target image. And a second image in which the first image received by the image sensor 82B is brought closer to the third target image. The second phase distribution calculation process is a process of calculating a second phase distribution corresponding to the luminance distribution of each second image calculated in the second image calculation process. The second control processing is performed such that the phase distributions of the light emitted from the phase modulation elements 53R, 53G, and 53B become the respective second phase distributions calculated by the second phase distribution calculation processing. This is a process for controlling 53B. The third image acquisition processing is a part of the light emitted from the phase modulation elements 53R, 53G, and 53B subjected to the second control processing, and the part of the light received by the image sensors 82R, 82G, and 82B. Each is a process of acquiring a third image. The fourth image calculation process is a process of calculating a fourth image obtained by transposing the pixel array of each third image acquired in the third image acquisition process. The third phase distribution calculation process is a process of calculating a third phase distribution corresponding to the luminance distribution of each of the fourth images calculated in the fourth image calculation process. In the replacement process, a fourth phase distribution in which a random phase distribution is added to each of the third phase distributions calculated in the third phase distribution calculation process is calculated, and these fourth phase distributions are each set as a first phase distribution. Processing.

  In the headlight 1 of the present embodiment, as described above, the phase modulation elements 53R, 53G, and 53B modulate the phase of the light from the light-emitting elements 51R, 51G, and 51B for each of the plurality of dots DT. Are emitted from the phase modulation elements 53R, 53G, 53B. Since the lights having different phases interfere with each other and are diffracted, the light emitted from the phase modulation elements 53R, 53G and 53B is diffracted according to the phase distribution of the light. Therefore, by controlling the phase modulation elements 53R, 53G, 53B by the control unit 71 and adjusting the phase distribution of the light emitted from the phase modulation elements 53R, 53G, 53B, the light is emitted from the phase modulation elements 53R, 53G, 53B. Light diffraction can be controlled. Then, a desired image can be projected by the combined light of the light emitted from the phase modulation elements 53R, 53G, and 53B.

  Further, the control unit 71 performs the iterative Fourier transform of the phase distribution of light by the above-described phase distribution generation processing, and obtains a first target phase distribution corresponding to the first target image, which is a red component of the target image, and a green color of the target image. A second target phase distribution corresponding to a second target image as a component and a third target phase distribution corresponding to a third target image as a blue component of the target image are calculated.

  In the first image acquisition process, the light emitted from the phase modulation elements 53R, 53G, and 53B is controlled so that the phase distribution of the light emitted from the phase modulation elements 53R, 53G, and 53B becomes the first phase distribution. The light received by each of 82G and 82B is acquired as a first image. As described above, since the image sensors 82R, 82G, and 82B receive the imaged light, the respective first images are images formed by the light emitted from the phase modulation elements 53R, 53G, and 53B. Here, it is known that an image obtained by imaging light is an image obtained by performing a Fourier transform on the phase distribution of the light. For this reason, each first image is generally an image obtained by Fourier-transforming the first phase distribution. Therefore, in the headlight 1 of the present embodiment, the calculation of the Fourier transform of each first phase distribution is omitted by using the Fourier transform effect generated by imaging light.

  Further, in the third image acquisition process, the light emitted from the phase modulation elements 53R, 53G, and 53B controlled so that the phase distribution of the light emitted from the phase modulation elements 53R, 53G, and 53B becomes the second phase distribution is output to the image sensor. The light received by 82R, 82G, and 82B is acquired as a third image. Then, in the fourth image calculation process, a fourth image obtained by transposing the pixel arrangement of each third image is calculated. Here, it is known that an image obtained by transposing an image obtained by imaging light is an image obtained by performing an inverse Fourier transform on the phase distribution of the light. For this reason, each of the fourth images is generally an image obtained by performing an inverse Fourier transform on the second phase distribution. Therefore, in the headlight 1 of the present embodiment, a part of the calculation of the inverse Fourier transform of the second phase distribution is omitted by using the Fourier transform effect generated by imaging light.

  As described above, in the headlamp 1 of the present embodiment, one of the operations of the Fourier transform and the inverse Fourier transform in the iterative Fourier transform of the phase distribution of light is performed by using the Fourier transform effect generated by imaging light. Parts are omitted. For this reason, the headlight 1 of the present embodiment reduces the amount of calculation when calculating the target phase distribution and reduces the calculation time as compared with the case where the Fourier transform and the inverse Fourier transform in the iterative Fourier transform are performed by calculation. Can be shortened. Therefore, the headlight 1 of the present embodiment can reduce the time required to project a desired image.

  Further, in the headlight 1 of the present embodiment, the light source 51 has a plurality of light emitting elements 51R, 51G, 51B, and the phase modulation unit 53 has a plurality of phase modulations provided for each of the plurality of light emitting elements 51R, 51G, 51B. It has elements 53R, 53G, and 53B. These light emitting elements 51R, 51G, and 51B emit light having different wavelength bands. Therefore, light in which the phase distribution of the light emitted from the light emitting element 51R is modulated is emitted from the phase modulation element 53R corresponding to the light emitting element 51R. Light in which the phase distribution of light emitted from the light emitting element 51G is modulated is emitted from the phase modulation element 53G corresponding to the light emitting element 51G, and light in which the phase distribution of light emitted from the light emitting element 51B is modulated is transmitted to the light emitting element 51B. The light is emitted from the corresponding phase modulation element 53B. That is, light beams having different wavelength bands are emitted from the plurality of phase modulation elements 53R, 53G, and 53B. For this reason, the headlight 1 of the present embodiment can project an image of a desired color by the light obtained by combining the light.

  Further, in the headlight 1 of the present embodiment, as described above, the plurality of light receiving optical systems 54R, 54G, and 54B correspond to the plurality of light emitting elements 51R, 51G, and 51B that emit light having different wavelength bands. Provided for each of the plurality of phase modulation elements 53R, 53G, and 53B. Therefore, the image sensors 82R, 82G, and 82B are provided for each of the plurality of phase modulation elements 53R, 53G, and 53B. Further, in the headlight 1 of the present embodiment, the first target image which is a red component of the target image, the second target image which is a green component of the target image, and the third target image which is a blue component of the target image. Is provided. That is, the target image is provided for each of the light emitting elements 51R, 51G, and 51B that emit light having different wavelength bands. Further, the control section 71 calculates a target phase distribution by the above-described phase distribution generation processing for each of the plurality of phase modulation elements 53R, 53G, 53B. Therefore, the control unit 71 can control the phase modulation elements 53R, 53G, and 53B that emit lights having different wavelength bands based on the respective target phase distributions. For this reason, the headlight 1 of the present embodiment can suppress the occurrence of color bleeding in the projected image. Further, the headlight 1 of the present embodiment can project an image composed of a plurality of colors. Since these phase modulation elements 53R, 53G, and 53B correspond to the light emitting elements 51R, 51G, and 51B, respectively, it can be understood that the control unit 71 calculates the target phase distribution for each of the light emitting elements 51R, 51G, and 51B.

  In addition, the headlight 1 of the present embodiment includes the light splitting units 80R, 80G that separate the lights DLR, DLG, DLB emitted from the phase modulation elements 53R, 53G, 53B into a part of light and another part of light, respectively. , 80B. For this reason, even if the light source 51 does not have a light emitting element in which the emitted light enters only the image sensors 82R, 82G, and 82B, a part of the light emitted from the phase modulation unit 53 is transmitted to the image sensors 82R, 82G, and 82B. Light can be received, and the headlamp 1 can have a simple configuration.

  Further, in the headlamp 1 of the present embodiment, the respective light receiving optical systems 54R, 54G, and 54B form light DLRs, DLGs, and DLBs, which are partial lights separated by the spectral units 80R, 80G, and 80B. Fourier transform lenses 81R, 81G, and 81B are provided. For this reason, the headlight 1 of the present embodiment can stably form an image of the lights DLR, DLG, and DLB, which are partial lights emitted from the phase modulation elements 53R, 53G, and 53B.

(2nd Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIGS. It should be noted that components that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals unless otherwise specified, and duplicate descriptions are omitted.

  FIG. 9 is a view showing a vehicle lamp according to a second embodiment of the present invention, similarly to FIG. 1, and FIG. 10 is an enlarged view of the optical system unit shown in FIG. In FIG. 10, illustration of the heat sink 30, the cover 59, and the like is omitted for easy understanding. As shown in FIGS. 9 and 10, the headlamp 1 of the present embodiment is different from the headlamp 1 in that the lamp unit 20 includes a projection lens 85, a first light receiving optical system 54 </ b> R, a second light receiving optical system 54 </ b> G, and a third light receiving optical system. The system 54B differs from the headlight 1 of the first embodiment in that the system 54B does not include the Fourier transform lenses 81R, 81G, and 81B. The projection lens 85 is a lens that adjusts the divergence angle of incident light. Lights DLR, DLG, and DLB emitted from the optical system unit 50 enter the projection lens 85, and the divergence angles of these lights DLR, DLG, and DLB are adjusted by the projection lens 85. In the present embodiment, the projection lens 85 is a lens in which the entrance surface and the exit surface are formed in a convex shape.

  The control unit 71 in the present embodiment controls each of the phase modulation elements 53R, 53G, and 53B to form an image of each of the light emitted from the phase modulation elements 53R, 53G, and 53B. Specifically, the control unit 71 outputs the first light DLR, which is the light emitted from the phase modulation element 53R and separated by the spectroscopic unit 80R toward the combining optical system 55, and the spectroscopic unit 80G output from the phase modulation element 53G. The second light DLG, which is the light separated to the combining optical system 55 side by the above, and the third light DLB, which is the light emitted from the phase modulation element 53R and separated to the combining optical system 55 side by the spectroscopic unit 80B, are , The phase modulation elements 53R, 53G, 53B are respectively controlled so as to form an image at substantially the same position. The light DLR, DLG, and DLB thus imaged propagate so as to diverge after being imaged. The position where these lights DLR, DLG, and DLB form an image is closer to the optical system unit 50 than the projection lens 85 is. By doing so, the divergence angles of the light DLR, DLG, DLB are adjusted by the projection lens 85, and the light DLR, DLG, DLB light whose divergence angle is adjusted is transmitted from the headlight 1 via the front cover 12. Emit.

  When the phase modulation elements 53R, 53G, and 53B are controlled as described above, the light emitted from the phase modulation element 53R and separated by the spectral unit 80R toward the image sensor 82R and the light emitted from the phase modulation element 53G and dispersed by the spectral unit 80G. The light separated on the image sensor 82G side and the light emitted from the phase modulation element 53B and separated on the image sensor 82B side by the spectral unit 80B also form an image. That is, it can be understood that the control unit 71 controls the phase modulation elements 53R, 53G, and 53B to image these lights. In the present embodiment, the image sensor 82R is arranged such that the light separated on the image sensor 82R side by the spectroscopic unit 80R forms an image or a light receiving surface is located near the image forming position. Further, the image sensor 82G is arranged so that the light separated on the image sensor 82G side by the spectroscopic unit 80G or the light receiving surface is located near the image forming position, and the image sensor 82B is controlled by the spectroscopic unit 80B. It is arranged such that the light receiving surface is located near the image forming position of the light separated on the image sensor 82B side or this image forming position. Therefore, the image sensor 82R receives light emitted from the phase modulation element 53R and forms an image, the image sensor 82G receives light emitted from the phase modulation element 53G and forms an image, and the image sensor 82B The light emitted from the phase modulation element 53B to form an image is received. Accordingly, similarly to the first embodiment, the headlamp 1 of the present embodiment uses the Fourier transform effect generated by imaging light to perform an inverse operation of the Fourier transform in the iterative Fourier transform of the phase distribution of light. Part of the Fourier transform operation can be omitted. Therefore, the headlight 1 of the present embodiment reduces the amount of calculation when calculating the target phase distribution and shortens the calculation time as compared with the case where the Fourier transform and the inverse Fourier transform in the iterative Fourier transform are performed by calculation. I can do it.

  Further, the headlight 1 of the present embodiment includes a projection lens 85 that adjusts the divergence angle of light emitted from the phase modulation elements 53R, 53G, and 53B and emitted to the outside of the vehicle. For this reason, the headlight 1 of the present embodiment can emit the light whose divergence angle has been adjusted to the outside of the vehicle, and can reduce the size of the image to be projected as compared with the case where the projection lens 85 is not provided. Easy to size.

  In the headlight 1 of the present embodiment, the control unit 71 controls each of the phase modulation elements 53R, 53G, and 53B to control each of the lights DLR, DLG, and DLB emitted from the phase modulation elements 53R, 53G, and 53B. Make an image. The light that forms an image is received by the image sensors 82R, 82G, and 82B. For this reason, the headlight 1 of the present embodiment can form an image of a part of the light emitted from the phase modulation elements 53R, 53G, and 53B without including a Fourier transform lens or the like, and It may be a simple configuration.

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to FIG. It should be noted that components that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals unless otherwise specified, and duplicate descriptions are omitted.

  FIG. 11 is a diagram showing an optical system unit according to the third embodiment of the present invention, similarly to FIG. In FIG. 11, illustration of the heat sink 30, the cover 59, and the like is omitted for easy understanding. As shown in FIG. 11, the optical system unit 50 of the present embodiment is such that the light source 51 further includes a test light emitting element 51T and a collimating lens 52T, and the phase modulation unit 53 further includes a test phase modulation element 53T. 3 is different from the optical system unit 50 of the first embodiment. Further, the optical system unit 50 of the present embodiment includes a Fourier transform lens 81T and an image sensor 82T instead of the first light receiving optical system 54R, the second light receiving optical system 54G, and the third light receiving optical system 54B. And the optical system unit 50 of the first embodiment.

  The test light emitting element 51T of this embodiment emits red laser light having a peak power wavelength of, for example, 638 nm, similarly to the light emitting element 51R. The test light emitting element 51T is mounted on a circuit board (not shown) like the other light emitting elements 51R, 51G, and 51B, and is controlled by the control unit 71.

  The collimating lens 52T is a lens that collimates the laser light emitted from the test light emitting element 51T in the fast axis direction and the slow axis direction.

  The test phase modulation element 53T of this embodiment is a reflection-type phase modulation element that modulates the phase distribution of light while reflecting incident light, similarly to the other phase modulation elements 53R, 53G, and 53B. It is controlled by the unit 71. A red laser beam emitted from the test light emitting element 51T and collimated by the collimating lens 52T enters the test phase modulation element 53T, and the test phase modulation element 53T modulates the phase distribution of the red laser light. The emitted light DLT is emitted.

  The Fourier transform lens 81T is a lens that forms an image of the light DLT emitted from the test phase modulation element 53T. The Fourier transform lens 81T of the present embodiment is a lens in which the entrance surface and the exit surface are formed in a convex shape.

  The image sensor 82T is an optical element that converts light received on the light receiving surface into an electric signal and outputs the electric signal. The image sensor 82T has a plurality of light receiving units that receive light, and controls the light incident on the light receiving surface as a two-dimensional image as a two-dimensional image. 71. The image sensor 82T is arranged so that the light receiving surface is located at or near the focal point of the Fourier transform lens 81T, and receives light formed by the Fourier transform lens 81T.

  In the present embodiment, the lights DLR, DLG, and DLB emitted from the phase modulation elements 53R, 53G, and 53B of the phase modulation unit 53 are respectively combined by the combining optical system 55 and irradiated to the outside of the vehicle. On the other hand, the light DLT emitted from the test phase modulation element 53T of the phase modulation unit 53 is formed into an image without being combined with the lights DLR, DLG, and DLB emitted from the phase modulation elements 53R, 53G, and 53B. The light is received by the sensor 82T. For this reason, the light DLT emitted from the test phase modulation element 53T is imaged as a part of the light emitted from the phase modulation unit 53 and received by the image sensor 82T, and the other part of the light is emitted by the phase modulation element 53R, It can be understood that light DLR, DLG, DLB emitted from 53G, 53B is irradiated to the outside of the vehicle. Further, as described above, the peak wavelength of the light emitted from the test light emitting element 51T is the same as the peak wavelength of the light emitted from the light emitting element 51R. Therefore, the wavelength band of the light DLT emitted from the test phase modulation element 53T is a part of the wavelength band of the light DLR, DLG, DLB emitted from the phase modulation elements 53R, 53G, 53B.

  In the present embodiment, the target image generation unit 73 calculates a test target image which is a red component image of the target image projected from the headlight 1, and the phase distribution generation processing in the control unit 71 determines that the emitted light is The test is performed on the test phase modulation element 53T received by the image sensor 82T. Note that the control flowchart of the control unit in the phase distribution generation processing in the present embodiment is the same as that in the first embodiment, and therefore the phase distribution generation processing in the present embodiment will be described with reference to FIG. In addition, the same or similar processing as the phase distribution generation processing in the first embodiment will not be described repeatedly unless otherwise specified.

  In step SP11 of the phase distribution generation processing in the present embodiment, the control unit 71 controls the test phase modulation element 53T such that the phase distribution of the light emitted from the test phase modulation element 53T becomes a predetermined first phase distribution. I do. Further, the control unit 71 controls the test light emitting element 51T so that laser light having a predetermined intensity is emitted from the test light emitting element 51T. Next, in step SP12, the control unit 71 acquires, as a first image, light emitted from the test phase modulation element 53T subjected to the first control processing and received by the image sensor 82T. The control unit 71 calculates the second image in step SP13, and calculates the second phase distribution in step SP14, as in the first embodiment. Next, in step SP15, the control unit 71 controls the test phase modulation element 53T such that the phase distribution of the light emitted from the test phase modulation element 53T becomes the second phase distribution calculated in step SP14. Next, in step SP16, the control unit 71 acquires, as a third image, light emitted from the test phase modulation element 53T subjected to the second control processing and received by the image sensor 82T. The control unit 71 calculates the fourth image in step SP17 and calculates the third phase distribution in step SP18, as in the first embodiment. In step SP19, the control unit 71 calculates a fourth phase distribution in which a random phase distribution is added to the third phase distribution, as in the first embodiment, and returns to step SP11 to calculate the fourth phase distribution. A first control process is performed as a predetermined first phase distribution. The control unit 71 performs a cycle from step SP11 to step SP19 a predetermined number of times, as in the first embodiment, and calculates a test target phase distribution for the test phase modulation element 53T. Further, the control unit 71 controls the test light emitting element 51T so that the laser light from the test light emitting element 51T is not emitted, and ends the phase distribution generation processing. Therefore, the test light emitting element 51T of the present embodiment does not emit laser light when the phase distribution generation processing is not performed.

  Based on the test target phase distribution calculated by the above-described phase distribution generation processing, the control unit 71 in the present embodiment performs a first target phase distribution for the phase modulation element 53R and a second target phase distribution for the phase modulation element 53G. And a third target phase distribution for the phase modulation element 53B. Specifically, the control unit 71 sets the test target phase distribution as the first target phase distribution for the phase modulation element 53R. The wavelength band of light emitted from the test light emitting element 51T is substantially the same as the wavelength band of light emitted from the light emitting element 51R. For this reason, the light emitted from the phase modulation element 53R controlled so that the phase distribution of the light emitted from the phase modulation element 53R becomes the first target phase distribution is the light that projects the red component image of the target image. Becomes Further, the control unit 71 performs correction on the first target phase distribution to calculate a second target phase distribution. In this correction, the first target phase distribution is a phase distribution of light emitted from the phase modulation element 53G, and is a phase distribution such that this light becomes light that projects a green component image of a target image. Correction. In addition, the control unit 71 calculates the third target phase distribution by performing correction on the first target phase distribution. In this correction, the first target phase distribution is a phase distribution of light emitted from the phase modulation element 53B, and is a phase distribution such that this light becomes light that projects a blue component image of a target image. Correction. These corrections are corrections based on the wavelength band of light emitted from each of the phase modulation elements 53G and 53B. As such a correction, for example, a correction based on a predetermined proportional constant can be given.

  Then, the control unit 71 controls the phase modulation element 53R based on the first target phase distribution calculated as described above, and controls the phase modulation element 53G based on the second target phase distribution calculated as described above. And controls the phase modulation element 53B based on the third target phase distribution calculated as described above. Lights DLR, DLG, and DLB emitted from these phase modulation elements 53R, 53G, and 53B are radiated to the outside of the vehicle.

  In the headlamp 1 of the present embodiment, as described above, lights having different wavelength bands are emitted from the plurality of phase modulation elements 53R, 53G, and 53B. For this reason, the headlight 1 of the present embodiment can project an image of a desired color by the light obtained by combining the light.

  Further, in the headlight 1 of the present embodiment, light emitted from the light emitting elements 51R, 51G, 51B enters the phase modulating elements 53R, 53G, 53B of the phase modulating section 53, and these phase modulating elements 53R, 53G. , 53B, respectively, are combined by the combining optical system 55 and irradiated to the outside of the vehicle. On the other hand, the light emitted from the test light emitting element 51T is incident on the test phase modulation element 53T of the phase modulation unit 53, and the light DLT emitted from the test phase modulation element 53T is imaged by the image sensor 82T. Received. That is, the light DLR, DLG, DLB and the light DLT are emitted from separate light emitting elements. The light DLT is received by the image sensor 82T without being combined with the lights DLR, DLG, and DLB. Therefore, the intensity of the light DLT received by the image sensor 82T and the intensity of the light DLR, DLG, and DLB emitted to the outside of the vehicle can be individually adjusted. Therefore, for example, it becomes easy to cause the image sensor 82T to receive light having an intensity corresponding to the performance of the image sensor 82T, or to irradiate the outside of the vehicle with light having a desired intensity.

  In the headlight 1 of the present embodiment, the light DLT received by the image sensor 82T is not emitted from the test light emitting element 51T when the control unit 71 does not perform the phase distribution generation processing. Therefore, the power consumption of the light source 51 can be reduced as compared with the case where the light DLT received by the image sensor 82T is constantly emitted.

  In the headlight 1 of the present embodiment, the control unit 71 calculates a first target phase distribution for the phase modulation element 53R among the plurality of phase modulation elements 53R, 53G, and 53B by a phase distribution generation process. The target phase distribution for the other phase modulation elements 53G and 53B is calculated from one target phase distribution. For this reason, the headlamp 1 of the present embodiment can calculate the target phase distribution for each of the plurality of phase modulation elements without having a plurality of image sensors, and the headlamp 1 can have a simple configuration. .

  Further, in the headlight 1 of the present embodiment, the control unit 71 has a phase distribution of light emitted from the phase modulation element 53G, and this light is light that projects a green component image of a target image. The second target phase distribution corresponding to the phase modulation element 53G is calculated by performing the correction that provides such a phase distribution to the first target phase distribution. Further, the control unit 71 corrects the phase distribution of the light emitted from the phase modulation element 53B such that the light becomes a light that projects the blue component image of the target image. A third target phase distribution corresponding to the phase modulation element 53B is calculated by applying the target phase distribution. Therefore, the target phase distribution corresponding to each of the phase modulation elements 53R, 53G, 53B is a phase distribution corresponding to the wavelength band of the light DLR, DLG, DLB emitted from each of the phase modulation elements 53R, 53G, 53B. . For this reason, the headlight 1 of the present embodiment can suppress the occurrence of color bleeding in the target image projected by the light obtained by combining the lights DLR, DLG, and DLB. Note that the control unit 71 may set the first target phase distribution as the second target phase distribution, and may set the first target phase distribution as the third target phase distribution. However, from the viewpoint of suppressing the occurrence of color bleeding in an image to be projected, the control unit 71 calculates the second target phase distribution and the third target phase distribution by correcting the first target phase distribution. Is preferred.

  In the headlight 1 of the present embodiment, as described above, the wavelength band of the light DLT emitted from the test phase modulation element 53T, which is a part of the light emitted from the phase modulation section 53, is equal to the phase modulation section 53. Are part of the wavelength band of the lights DLR, DLG, and DLB emitted from the phase modulation elements 53R, 53G, and 53B, which are other parts of the light emitted from. However, the wavelength band of the light DLT emitted from the test phase modulation element 53T may be different from the wavelength band of the light DLR, DLG, DLB emitted from the phase modulation elements 53R, 53G, 53B. That is, the wavelength band of the light emitted from the test light emitting element 51T among the light emitting elements of the light source 51 may be different from the wavelength bands of the other light emitting elements 51R, 51G, and 51B. For example, the wavelength band of light emitted from the test light emitting element 51T may be the wavelength band of invisible light. In this case, even if the light emitted from the test light emitting element 51T is unintentionally applied to the outside of the vehicle, it is possible to suppress the influence of the light on the projected image. When the wavelength band of the light emitted from the test light emitting element 51T is different from the wavelength bands of the other light emitting elements 51R, 51G, and 51B, the control unit 71 calculates, for example, the number calculated by the above-described phase generation processing. The same correction as that applied to the second target phase distribution and the third target phase distribution is performed on one target phase distribution. Therefore, from the viewpoint of reducing the calculation amount of the control unit 71, it is preferable that the wavelength band of the light emitted from the test light emitting element 51T is at least a part of the other light emitting elements 51R, 51G, and 51B.

  By the way, in the phase distribution generation processing, the image formed by the light emitted from the phase modulation element controlled so that the phase distribution of the light emitted from the phase modulation element becomes the second phase distribution is significantly different from the target image. However, in the headlight 1 of the present embodiment, the light DLT emitted from the test phase modulation element 53T during the phase distribution generation processing is received by the image sensor 82T and is not irradiated to the outside of the vehicle. For this reason, since an image greatly different from the target image is not emitted to the outside of the vehicle, it is possible to suppress a driver or a person outside the vehicle from feeling uncomfortable.

  In the present embodiment, the headlight 1 includes three light emitting elements 51R, 51G, and 51B different from the test light emitting element 51T. However, the headlight 1 only needs to include at least one light emitting element separate from the test light emitting element 51T.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described in detail with reference to FIG. It should be noted that components that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals unless otherwise specified, and duplicate descriptions are omitted.

  FIG. 12 is a diagram showing an optical system unit according to the fourth embodiment of the present invention, similarly to FIG. In FIG. 12, illustration of the heat sink 30, the cover 59, and the like is omitted for easy understanding. As shown in FIG. 12, the optical system unit 50 of this embodiment includes a common light receiving optical system 54S instead of the first light receiving optical system 54R, the second light receiving optical system 54G, and the third light receiving optical system 54B. 3 is different from the optical system unit 50 of the first embodiment.

  The common light receiving optical system 54S of the present embodiment includes a spectral unit 80S, an optical filter 86, a Fourier transform lens 81S, and an image sensor 82S. The light splitting unit 80S separates the lights DLR, DLG, and DLB emitted from the combining optical system 55 into a part of light and another part of light. As the light splitting unit 80S, for example, similar to the light splitting unit 80R of the first embodiment, a prism type beam splitter, a flat type beam splitter, a wedge substrate, and the like are given. Part of the light separated by the light splitting unit 80S is incident on the optical filter 86, and part of the other light is emitted from the common light receiving optical system 54S and irradiated to the outside of the vehicle. For this reason, the light emitted from the common light receiving optical system 54S is a part of the light DLR, DLG, and DLB emitted from the combining optical system 55, and this light is hereinafter also referred to as light DLR, DLG, and DLB. The light separation ratio in the light splitting unit 80R of the present embodiment is fixed.

  The optical filter 86 is an optical element that transmits any one of the lights DLR, DLG, and DLB emitted from the plurality of phase modulation elements 53R, 53G, and 53B and does not transmit the other light. In the present embodiment, the optical filter 86 transmits the first light DLR emitted from the phase modulation element 53R and does not transmit the lights DLG and DLB emitted from the phase modulation elements 53G and 53B. As such an optical filter 86, for example, the same wavelength selection filter as the first optical element 55f can be used.

  The Fourier transform lens 81S is a lens that forms an image of the first light DLR transmitted through the optical filter 86. The Fourier transform lens 81S of the present embodiment is a lens in which the entrance surface and the exit surface are formed in a convex shape.

  The image sensor 82S is an optical element that converts light received on the light receiving surface into an electric signal and outputs the electric signal. The image sensor 82S has a plurality of light receiving units that receive light, and controls the light incident on the light receiving surface as a two-dimensional image as a two-dimensional image. 71. The image sensor 82S is arranged such that the light receiving surface is located at or near the focal point of the Fourier transform lens 81S, and receives light formed by the Fourier transform lens 81S. A part of the first light DLR thus separated by the light splitting unit 80S is received by the image sensor 82S, and another part of the first light DLR is emitted outside the vehicle. For this reason, the wavelength band of the light received by the image sensor 82S is the wavelength band of the other part of the light DLR, DLG, and DLB emitted from the phase modulation elements 53R, 53G, and 53B and separated by the spectroscopic unit 80S. Part.

  In the present embodiment, the target image generation unit 73 calculates a first target image, which is an image of a red component of the target image projected from the headlight 1, and the control unit 71 performs a phase distribution generation process on the emitted light. A part is performed on the phase modulation element 53R that is received by the image sensor 82S. The control unit 71 calculates a first target phase distribution for the phase modulation element 53R in the same manner as in the phase distribution generation processing of the third embodiment, and from this first target phase distribution, calculates a first target phase distribution for the other phase modulation elements 53G and 53B. Calculate the target phase distribution. For example, the control unit 71 performs the same correction as in the third embodiment on the first target phase distribution, and calculates the target phase distribution for the other phase modulation elements 53G and 53B.

  The control unit 71 controls the phase modulation element 53R based on the calculated first target phase distribution, controls the phase modulation element 53G based on the calculated second target phase distribution, and calculates the calculated third target phase. The phase modulation element 53B is controlled based on the distribution. Then, light DLR, DLG, DLB emitted from these phase modulation elements 53R, 53G, 53B is irradiated to the outside of the vehicle.

  In the headlamp 1 of the present embodiment, as described above, lights having different wavelength bands are emitted from the plurality of phase modulation elements 53R, 53G, and 53B. For this reason, the headlight 1 of the present embodiment can project an image of a desired color by the light obtained by combining the light.

  Further, in the headlamp 1 of the present embodiment, as described above, the control unit 71 determines the first target phase distribution for the phase modulation element 53R among the plurality of phase modulation elements 53R, 53G, 53B by the phase distribution generation processing. Then, a target phase distribution for the other phase modulation elements 53G and 53B is calculated from the first target phase distribution. Therefore, similarly to the third embodiment, the headlamp 1 of the present embodiment can calculate the target phase distribution for each of the plurality of phase modulation elements without including the plurality of image sensors. The illuminator 1 can have a simple configuration.

  In the headlight 1 of the present embodiment, a part of the light separated by the light splitting unit 80S is incident on the optical filter 86. For this reason, since the wavelength band of the other part of the light separated by the spectroscopic unit 80S is the same as the wavelength band of the light emitted from the phase modulation unit 53, it is possible to suppress a change in the tint of the projected image. obtain.

  In the headlight 1 of the present embodiment, the control unit 71 performs the same correction as that of the third embodiment on the first target phase distribution to calculate the target phase distribution for the other phase modulation elements 53G and 53B. I do. For this reason, the headlight 1 of the present embodiment can suppress the occurrence of color bleeding in the target image projected by the light obtained by combining the lights DLR, DLG, and DLB, as in the third embodiment. .

  In the present embodiment, the optical filter 86 on which a part of the light separated by the light splitting unit 80G is incident has been described as an example. However, it is only necessary that a part of the light separated by the light splitting unit 80G is incident on the optical filter 86 and the light transmitted through the optical filter 86 is received by the image sensor 82S. For example, the optical filter 86 may be arranged so that light emitted from the Fourier transform lens 81S enters the optical filter 86.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described in detail with reference to FIG. It should be noted that components that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals unless otherwise specified, and duplicate descriptions are omitted.

  FIG. 13 is a diagram showing an optical system unit according to the fifth embodiment of the present invention, similarly to FIG. 13, illustration of the heat sink 30, the cover 59, and the like is omitted for easy understanding. As shown in FIG. 13, the phase modulation unit 53 of the first embodiment includes a single phase modulation element 53S instead of the three phase modulation elements 53R, 53G, and 53B. Different from 53. Further, the optical system unit 50 of the present embodiment is different from the first embodiment in that a common light receiving optical system 54S is provided instead of the first light receiving optical system 54R, the second light receiving optical system 54G, and the third light receiving optical system 54B. It is different from the optical system unit 50 of the embodiment.

  In the present embodiment, the configuration of the phase modulation element 53S is the same as the configuration of the phase modulation elements 53R, 53G, and 53B of the first embodiment. Light emitted from the combining optical system 55 enters the phase modulation element 53S. Specifically, the laser light emitted from the light emitting element 51R is collimated by the collimating lens 52R, passes through the first optical element 55f and the second optical element 55s of the combining optical system 55, and enters the phase modulation element 53S. . Laser light emitted from the light emitting element 51G is collimated by the collimator lens 52G, reflected by the first optical element 55f of the combining optical system 55, transmitted through the second optical element 55s, and enters the phase modulation element 53S. Laser light emitted from the light emitting element 51B is collimated by the collimating lens 52B, reflected by the second optical element 55s of the combining optical system 55, and incident on the phase modulation element 53S. Note that the laser light emitted from these light emitting elements 51R, 51G, 51B only needs to enter the phase modulation element 53S, and the configuration of the combining optical system 55 is not limited. For example, these laser beams may be incident on the phase modulation element 53S without passing through the combining optical system 55. In other words, the light emitting elements 51R, 51G, 51B, the collimating lenses 52R, 52G, 52B, and so on, so that the laser light emitted from the light emitting elements 51R, 51G, 51B enters the phase modulation element 53S without passing through the combining optical system 55. The phase modulation element 53S may be provided.

  In the present embodiment, the power supplied to the light emitting elements 51R, 51G, 51B is adjusted, and laser light is emitted alternately for each of the light emitting elements 51R, 51G, 51B. That is, when the light emitting element 51R emits laser light, the light emitting element 51G and the light emitting element 51B do not emit laser light, and when the light emitting element 51G emits laser light, the light emitting element 51R and the light emitting element 51B do not emit laser light. Does not emit laser light, and when the light emitting element 51B emits laser light, the light emitting element 51R and the light emitting element 51G do not emit laser light. Then, the emission of the laser light for each of the light emitting elements 51R, 51G, 51B is sequentially switched. Therefore, laser beams having different wavelength bands emitted from the light emitting elements 51R, 51G, and 51B sequentially enter the phase modulation element 53S, and the phase modulation element 53S sequentially emits light obtained by modulating the phase distribution of the incident laser light. I do. For this reason, the phase modulation element 53S sequentially emits lights having different wavelength bands in synchronization with the switching of the emission of the laser light for each of the light emitting elements 51R, 51G, and 51B.

  The common light receiving optical system 54S of the present embodiment includes a light splitting unit 80S, a Fourier transform lens 81S, and an image sensor 82S. The light splitting unit 80S separates the light emitted from the phase modulation element 53S into some light and some other light. Part of the light separated by the spectroscopy unit 80S enters the Fourier transform lens 81S, and another part of the light exits from the common light receiving optical system 54S and is irradiated to the outside of the vehicle. The light separation ratio in the spectroscopic unit 80S of the present embodiment is constant.

  The Fourier transform lens 81S is a lens that forms an image of a part of the light separated by the light splitting unit 80G. The Fourier transform lens 81S of the present embodiment is a lens in which the entrance surface and the exit surface are formed in a convex shape.

  The image sensor 82S is an optical element that converts light received on the light receiving surface into an electric signal and outputs the electric signal. The image sensor 82S has a plurality of light receiving units that receive light, and controls the light incident on the light receiving surface as a two-dimensional image as a two-dimensional image. 71. The image sensor 82S is arranged such that the light receiving surface is located at or near the focal point of the Fourier transform lens 81S, and receives light formed by the Fourier transform lens 81S. As described above, a part of the light emitted from the phase modulation element 53S and separated by the spectroscopic unit 80G is received by the image sensor 82S. Therefore, the wavelength band of the light received by the image sensor 82S is a part of the wavelength band of the light DLR, DLG, and DLB emitted from the phase modulation elements 53R, 53G, and 53B.

  Next, emission of light from the phase modulation element 53S of the present embodiment will be described. Specifically, a case will be described as an example where the headlight 1 emits light of a high-beam light distribution pattern that is a predetermined light distribution pattern.

  In the present embodiment, the control unit 71 controls the phase modulation element 53S in synchronization with the switching of the emission of the laser light for each of the light emitting elements 51R, 51G, and 51B as described above. Therefore, the phase modulation element 53S modulates the phase distribution of the incident laser light according to the wavelength band of the laser light, and the light having the modulated phase distribution is emitted from the phase modulation element 53S. Further, similarly to the first embodiment, the control unit 71 controls the phase modulation element 53S based on a predetermined light phase distribution corresponding to the image of the high beam light distribution pattern stored in the storage unit 75. . Specifically, when the laser light emitted from the light emitting element 51R enters the phase modulation element 53S, the control unit 71 determines that the phase distribution of the light emitted from the phase modulation element 53S is the first reference phase distribution. Thus, the phase modulation element 53S is controlled. For this reason, when the laser light emitted from the light emitting element 51R is incident on the phase modulation element 53S, the light of the light distribution pattern that projects an image obtained by extracting the red component in the image of the high beam light distribution pattern is applied to the phase modulation element 53S. Shoot from. Further, when the laser light emitted from the light emitting element 51G is incident on the phase modulation element 53S, the control unit 71 sets the phase so that the phase distribution of the light emitted from the phase modulation element 53S becomes the second reference phase distribution. The modulation element 53S is controlled. For this reason, when the laser light emitted from the light emitting element 51G is incident on the phase modulation element 53S, the light of the light distribution pattern that projects the image obtained by extracting the green component in the image of the high beam light distribution pattern is applied to the phase modulation element 53S. Shoot from. Further, when the laser light emitted from the light emitting element 51B is incident on the phase modulation element 53S, the control unit 71 controls the phase so that the phase distribution of the light emitted from the phase modulation element 53S becomes the third reference phase distribution. The modulation element 53S is controlled. For this reason, when the laser light emitted from the light emitting element 51B is incident on the phase modulation element 53S, the light of the light distribution pattern that projects the image obtained by extracting the blue component in the image of the high beam light distribution pattern is applied to the phase modulation element 53S. Shoot from.

  The phase modulation element 53S modulates the phase distribution of the incident laser light according to the wavelength band of the incident laser light in this manner, so that the high-beam red component light, the high-beam green component light, and the high-beam blue The light of the component is sequentially emitted. That is, the phase modulation element 53S sequentially emits the first light DLR, the second light DLG, and the third light DLB in the first embodiment. These lights DLR, DLG, and DLB are respectively emitted from the openings 59H of the cover 59, and sequentially emitted to the outside of the headlight 1 via the front cover 12. At this time, the first light DLR, the second light DLG, and the third light DLB are radiated such that regions illuminated with each other overlap with each other at a focal position at a predetermined distance from the vehicle. . This focal position is, for example, a position 25 m away from the vehicle. Note that the first light DLR, the second light DLG, and the third light DLB are emitted such that the outlines of the regions to which the respective lights DLR, DLG, and DLB are irradiated substantially coincide at this focal position. Is preferred. Further, in the present embodiment, the lengths of the respective emission times of the laser beams emitted from the light emitting elements 51R, 51G, 51B are substantially the same, so that the respective emission times of the light DLR, DLG, DLB are also equal. Generally the same.

  By the way, when light of different colors is repeatedly irradiated with a period shorter than the temporal resolution of human vision, the person can recognize that the light obtained by combining the lights of different colors is irradiated by the afterimage phenomenon. In the present embodiment, when the time from when the light emitting element 51R emits laser light to when the light emitting element 51R emits laser light is shorter than the time resolution of human vision, the time resolution of human vision The light DLR, DLG, and DLB emitted from the phase modulation element 53S are repeatedly irradiated with a short period, and the first red light DLR, the second green light DLG, and the third blue light DLB are caused by an afterimage phenomenon. Synthesized. As described above, the emission times of the lights DLR, DLG, and DLB are substantially the same, and the intensity of the laser light emitted from the light emitting elements 51R, 51G, and 51B is a predetermined intensity. You. Therefore, the color of the light combined by the afterimage phenomenon is the same white as the light combined with the lights DLR, DLG, and DLB in the first embodiment. In addition, since the phase distribution of these lights DLR, DLG, and DLB emitted from the phase modulation element 53S is set to be the reference phase distribution corresponding to the image of the high beam light distribution pattern PH, the light distribution of the white high beam is performed. Light of the pattern PH is emitted from the headlight 1.

  The cycle at which the laser light is repeatedly emitted from the light emitting elements 51R, 51G, and 51B is preferably 1/15 s or less from the viewpoint of suppressing the flickering of the light combined by the afterimage phenomenon. The temporal resolution of human vision is approximately 1/30 s. In the case of a vehicle lamp, the flicker of light can be suppressed if the light emission cycle is about twice. If this cycle is 1/30 s or less, it substantially exceeds the temporal resolution of human vision. Therefore, it is possible to further suppress the flicker of light. In addition, from the viewpoint of further suppressing the perception of light flicker, it is preferable that this cycle is 1/60 s or less.

  Next, the phase distribution generation processing of the control unit 71 in the present embodiment will be described. Note that the control flowchart of the control unit in the phase distribution generation processing in the present embodiment is the same as that in the first embodiment, and therefore the phase distribution generation processing in the present embodiment will be described with reference to FIG. In addition, the same or similar processing as the phase distribution generation processing in the first embodiment will not be described repeatedly unless otherwise specified.

  In the present embodiment, the control unit 71 performs the first image acquisition process and the third image generation process in the phase distribution generation process according to the timing at which light is emitted from the phase modulation element 53S. It is different from the control unit 71 in the embodiment.

  In the present embodiment, similarly to the first embodiment, the target image generator 73 includes a first target image that is a red component image of the target image projected from the headlight 1 and a second target image that is a green component image. A target image and a third target image which is a blue component image are calculated. The phase distribution generation processing in the control unit 71 is performed for each of the light emitting elements 51R, 51G, and 51B. Specifically, the control unit 71 performs the first image acquisition processing and the third image generation processing in the phase distribution generation processing for the light emitting element 51R when the light from the light emitting element 51R is incident on the phase modulation element 53S. Do. For this reason, the wavelength band of the light emitted from the phase modulation element 53R and received by the image sensor 82R is the same as the wavelength band of the light emitted from the light emitting element 51R. Therefore, the first image and the third image acquired by the image sensor 82S by the control unit 71 respectively correspond to the light emitted from the light emitting element 51G. The control unit 71 calculates a target phase distribution for the light emitting element 51R using the first image and the third image acquired in this way. In addition, the control unit 71 performs the first image acquisition processing and the third image generation processing in the phase distribution generation processing for the light emitting element 51G when the light from the light emitting element 51G is incident on the phase modulation element 53S. Therefore, the wavelength band of light emitted from the phase modulation element 53S and received by the image sensor 82S is the same as the wavelength band of light emitted from the light emitting element 51G, and the first image and the third image acquired by the image sensor 82S. Each image corresponds to light emitted from the light emitting element 51G. The control unit 71 calculates a target phase distribution for the light emitting element 51G using the first image and the third image acquired in this manner. Further, the control unit 71 performs the first image acquisition processing and the third image generation processing in the phase distribution generation processing for the light emitting element 51B when the light from the light emitting element 51B is incident on the phase modulation element 53S. Therefore, the wavelength band of the light emitted from the phase modulation element 53S and received by the image sensor 82S is the same as the wavelength band of the light emitted from the light emitting element 51G, and the first image and the third image acquired by the image sensor 82S. Each image corresponds to light emitted from the light emitting element 51B. The control unit 71 calculates a target phase distribution for the light emitting element 51G using the first image and the third image acquired in this manner.

  The control unit 71 simultaneously performs a phase distribution generation process on each of the light emitting elements 51R, 51G, and 51B. In the present embodiment, the control unit 71 proceeds with the phase distribution generation processing for the light emitting elements 51R, 51G, and 51B according to the wavelength band of the light incident on the phase modulation element 53S. Specifically, the control unit 71 performs the first image acquisition processing or the third image generation processing in the phase distribution generation processing on the light emitting element 51R when the light from the light emitting element 51R is incident on the phase modulation element 53S. . The control unit 71 performs the first image acquisition process or the third image generation process in the phase distribution generation process on the light emitting element 51G when the light from the light emitting element 51G is incident on the phase modulation element 53S. Further, the control unit 71 performs the first image acquisition processing or the third image generation processing in the phase distribution generation processing on the light emitting element 51B when the light from the light emitting element 51B is incident on the phase modulation element 53S. That is, the control unit 71 obtains an image from the image sensor 82S in accordance with the switching of the light received by the image sensor 82S. Therefore, it takes time to calculate the target phase distribution for each of the light emitting elements 51R, 51G, and 51B. You can save time. Note that the target phase distribution for each of the light emitting elements 51R, 51G, 51B may be sequentially calculated. For example, after calculating the target phase distribution for the light emitting element 51R, the target phase distribution for the light emitting element 51G may be calculated, and then the target phase distribution for the light emitting element 51B may be calculated.

  The control unit 71 controls the phase modulation element 53S based on the calculated target phase distribution for each of the light emitting elements 51R, 51G, 51B. Specifically, when the light from the light emitting element 51R is incident on the phase modulation element 53S, the control unit 71 sets the phase distribution of the light emitted from the phase modulation element 53S to be the calculated target phase distribution for the light emitting element 51R. To control the phase modulation element 53S. The first light DLR that is the light of the red component of the target image is emitted from the phase modulation element 53S controlled as described above. Further, when light from the light emitting element 51G is incident on the phase modulation element 53S, the control unit 71 performs phase modulation so that the phase distribution of the light emitted from the phase modulation element 53S becomes the calculated target phase distribution for the light emitting element 51G. The element 53S is controlled. The second light DLG, which is the green component light of the target image, is emitted from the phase modulation element 53S controlled in this way. Further, when light from the light emitting element 51B is incident on the phase modulation element 53S, the control unit 71 performs phase modulation such that the phase distribution of the light emitted from the phase modulation element 53S becomes the calculated target phase distribution for the light emitting element 51B. The element 53S is controlled. The third light DLB, which is light of the blue component of the target image, is emitted from the phase modulation element 53S controlled in this way. The lights DLR, DLG, and DLB are combined by an afterimage phenomenon, and a target image is projected by the headlight 1.

  In the headlight 1 of the present embodiment, as described above, the lights DLR, DLG, and DLB having different wavelength bands are sequentially emitted from the phase modulation element 53S on which the lights from the three light emitting elements 51R, 51G, and 51B are incident. As described above, when light of different wavelength bands, that is, light of different colors, is repeatedly irradiated with a cycle shorter than the temporal resolution of human vision, the person irradiates the light obtained by combining the lights of different colors due to the afterimage phenomenon. It can be recognized that it has been. For this reason, when the light beams DLR, DLG, and DLB having different wavelength bands are emitted from the phase modulation element 53S at a period shorter than the time resolution of human vision, the light emitted from the phase modulation element 53S is output from the human. It can be visually synthesized. Therefore, the headlight 1 of the present embodiment can project an image of a desired color by the lights DLR, DLG, and DLB emitted from the phase modulation element 53S.

  In addition, in the headlight 1 of the present embodiment, the phase modulation element that modulates the phase distribution of the light emitted from the three light emitting elements 51R, 51G, and 51B can be a common phase modulation element. May decrease.

  Further, in the headlight 1 of the present embodiment, an image sensor 82S is provided for the three light emitting elements 51R, 51G, and 51B that emit light having different wavelength bands, and a target is provided for each of the light emitting elements 51R, 51G, and 51B. A phase distribution is calculated. For this reason, the control unit 71 controls the common phase modulation element 53S on which the light emitted from the three light emitting elements 51R, 51G, and 51B enters according to the wavelength band of the light incident on the phase modulation element 53S. Can be. For this reason, the headlight 1 of the present embodiment can suppress the occurrence of color bleeding in the projected image. Further, the headlight 1 of the present embodiment can project an image composed of a plurality of colors.

  In the present embodiment, the three light emitting elements 51R, 51G, and 51B emit light alternately for each of the light emitting elements 51R, 51G, and 51B. However, it is only necessary that at least two light emitting elements emit light alternately for each of the light emitting elements. In this case, the light emitted from the phase modulation element into which the light emitted from at least two light emitting elements is incident is combined by an afterimage phenomenon, and the light combined by the afterimage phenomenon and the light emitted from another phase modulation element are combined. Then, a desired image is projected. Further, in this case, an image formed of a plurality of colors can be projected by providing an image sensor for a phase modulation element on which light emitted from at least two light emitting elements is incident.

  Further, in the present embodiment, the phase distribution generation processing in the control unit 71 is performed on each of the light emitting elements 51R, 51G, and 51B. However, the phase distribution generation processing in the control unit 71 only needs to be performed on at least one light emitting element. In this case, the control unit 71 calculates a target phase distribution for another light emitting element from the target phase distribution calculated by the phase distribution generation processing. For example, the control unit 71 may perform the same correction as in the third embodiment on the target phase distribution calculated by the phase distribution generation processing to calculate the target phase distribution for another light emitting element.

  As described above, the present invention has been described with reference to the above embodiments, but the present invention is not limited to these embodiments.

  For example, in the above embodiment, the headlight 1 that projects an image in front of the vehicle has been described as an example, but the image projected by the vehicle lamp is not particularly limited.

  In the above-described embodiment, the phase distribution generation processing includes the first control processing, the first image acquisition processing, the second image calculation processing, the second phase distribution calculation processing, the second control processing, and the third image processing. An acquisition process, a fourth image calculation process, a third phase distribution calculation process, and a replacement process were included. However, the phase distribution generation processing may include processing other than these processings. For example, a determination process may be included that compares the second image calculated by the second image calculation process with the target image and determines whether the difference between the second image and the target image is within a predetermined range. . In this case, the control unit 71 may end the phase distribution generation processing when the difference is within a predetermined range, and may reduce the calculation time in the phase distribution generation processing.

  In the above embodiment, the target image is an image of a light distribution pattern in which a part of a predetermined light distribution pattern is darkened. In this case, the control unit 71 sets the first image in the first cycle of the phase distribution generation processing as the image of the predetermined light distribution pattern stored in the storage unit 75, and performs the first control in the first cycle of the phase distribution generation processing. The phase distribution generation processing may be performed by omitting the processing and the first image acquisition processing. According to such a configuration, the calculation time in the phase distribution generation processing can be reduced. In this case, since the target image is not significantly different from the image of the predetermined light distribution pattern, the phase distribution generation processing further includes the above-described determination processing, and thus the cycle until the calculation in the phase distribution generation processing converges. The number can be reduced. Therefore, the calculation time in the phase distribution generation processing can be reduced.

  In the first and second embodiments, the light emitting elements 51R, 51G, and 51B emit light having different wavelength bands, and the image sensors 82R and 82G are respectively applied to the phase modulation elements 53R, 53G, and 53B. , 82B. However, a light receiving optical system may be provided for at least one of the phase modulation elements 53R, 53G, and 53B. According to such a configuration, an image of a desired color can be projected. In this case, the target phase distribution for the phase modulation element having no corresponding light receiving optical system is calculated from the target phase distribution calculated by the phase distribution generation processing, for example, as in the third embodiment. Further, the image sensor may be provided for each of at least two phase modulation elements respectively corresponding to at least two of the light emitting elements 51R, 51G, and 51B that emit light having different wavelength bands. According to such a configuration, an image composed of a plurality of colors can be projected. In this case, the target phase distribution for the phase modulation element having no corresponding light receiving optical system is calculated from the target phase distribution calculated by the phase distribution generation processing, for example, as in the third embodiment.

  In the above embodiment, the phase modulation elements 53R, 53G, 53B, and 53S are reflection-type phase modulation elements. However, it is sufficient that the phase modulation element includes a plurality of two-dimensionally arranged dots and can modulate the phase of the incident light for each of the plurality of dots. For example, the phase modulation element may be an LCD (Liquid Crystal Display), which is a liquid crystal panel, or a GLV (Grating Light Valve) in which a plurality of reflectors are formed on a silicon substrate. The LCD is a transmission type phase modulation element. This LCD controls the voltage applied between a pair of electrodes sandwiching the liquid crystal layer in each dot to control the phase of light emitted from each dot, similarly to the LCOS which is a reflective liquid crystal panel described above. The change amount is adjusted, and the light distribution pattern of the emitted light can be made a desired light distribution pattern. This pair of electrodes is a transparent electrode. GLV is a reflection type phase modulation element. By electrically controlling the deflection of the reflector, the GLV can diffract incident light and emit the light, and can change the light distribution pattern of the emitted light to a desired light distribution pattern.

  In the above embodiment, the phase modulation elements 53R, 53G, 53B, and 53S having a plurality of modulation units have been described as examples. However, the number, size, outer shape, and the like of the modulators are not particularly limited. For example, the phase modulation element may include one modulation unit, and the phase distribution of the incident light may be modulated by the one modulation unit.

  In the first to fourth embodiments, the optical system unit 50 including a plurality of light emitting elements and a plurality of phase modulation elements corresponding to the respective light emitting elements on a one-to-one basis has been described as an example. However, the plurality of phase modulation elements may be formed integrally. As a configuration of such a phase modulation element, a configuration in which the phase modulation element is divided into a plurality of regions corresponding to the plurality of light emitting elements on a one-to-one basis can be given. The phase modulation element having such a configuration modulates the phase distribution of light emitted from the light emitting element corresponding to the region in each region. According to such a vehicle lamp, since a plurality of phase modulation elements are formed integrally, the number of components can be reduced.

  In the above-described embodiment, the first optical element 55f transmits the first light DLR and reflects the second light DLG to combine the first light DLR and the second light DLG. The second optical element 55s transmits the first light DLR and the second light DLG combined by the first optical element 55f, and reflects the third light DLB, thereby forming the first light DLR and the second light DLR. DLG and the third light DLB were synthesized. However, for example, the third light DLB and the second light DLG are combined in the first optical element 55f, and the third light DLB and the second light DLB combined in the first optical element 55f are combined in the second optical element 55s. The light DLG and the first light DLR may be configured to be combined. In this case, in the above embodiment, the positions of the light emitting element 51R, the collimating lens 52R, and the phase modulating element 53R and the light emitting element 51B, the collimating lens 52B, and the phase modulating element 53B are switched. In the above embodiment, a bandpass filter that transmits light in a predetermined wavelength band and reflects light in another wavelength band may be used for the first optical element 55f and the second optical element 55s. Further, in the above embodiment, the combining optical system 55 only needs to combine the lights emitted from the respective phase modulation elements, and is not limited to the configuration of the above embodiment or the above configuration.

  In the above embodiment, the optical system unit 50 includes the combining optical system 55 that combines the first light DLR, the second light DLG, and the third light DLB. However, the optical system unit 50 may not include the combining optical system 55.

  In the above-described embodiment, the spectroscopic units 80R, 80G, 80B, and 80S in which the light separation ratio is constant have been described as an example. However, the spectroscopic unit may be capable of changing the light separation ratio. Examples of the spectroscopic unit having a variable separation ratio include a device having a beam splitter that can change the separation ratio by changing an incident angle and an actuator that rotates the beam splitter. In the case of such a configuration, at least at the time of the third image acquisition process of the phase modulation generation process, the spectroscopic unit may change the separation ratio so that the intensity of light emitted to the outside of the vehicle decreases. That is, when the light is separated into a part of light and another part of light by the light splitting unit, and the light is partially received by the image sensor, at least at the time of the third image acquisition processing, the light splitting unit Alternatively, the separation ratio of this part of light with respect to this other part of light may be larger than this separation ratio in the first image acquisition processing. In this case, the intensity of the light emitted to the outside of the vehicle is reduced, so that an image greatly different from the target image becomes less noticeable, and it is possible to suppress a driver or a person outside the vehicle from feeling uncomfortable. Further, when the light splitting unit can change the separation ratio as described above, the light source may adjust the intensity of the emitted light according to the change in the separation ratio. By increasing the above separation ratio, the intensity of light received by the image sensor is increased. However, the light source adjusts the intensity of the emitted light according to the change in the separation ratio. For this reason, it is possible to suppress an increase in the intensity of light received by the image sensor in accordance with the change in the separation ratio, and to suppress a problem in the image sensor. In addition, even when the light separation ratio of the light splitting unit is fixed, the light source may reduce the intensity of the emitted light at least during the third image acquisition processing of the phase modulation generation processing. Also in this case, an image that is significantly different from the target image becomes less conspicuous, and it is possible to suppress a driver or a person outside the vehicle from feeling uncomfortable.

  In the above-described embodiment, the target image generated by the headlight 1 is calculated by the target image generator 73. However, the target image may be stored in the storage unit 75 or the like in advance, and the control unit 71 may read out the target image. The target image may be input to the control unit 71 from outside, for example, from a control device of the vehicle.

  In the above-described embodiment, the lamp unit 20 does not include the imaging lens system including the imaging lens on which the light emitted from the optical system unit 50 is incident. However, the lamp unit 20 may include an imaging lens system, and may emit light emitted from the optical system unit 50 via the imaging lens system. With such a configuration, it is possible to easily project a large image. Here, “wide” means that the light distribution pattern formed on a vertical plane separated from the vehicle by a predetermined distance is wider.

  In the above embodiment, the optical system unit 50 including the light source having a plurality of light emitting elements and the phase modulating section having the plurality of phase modulating elements has been described as an example. However, the optical system unit may include a light source having at least one light emitting element and a phase modulation unit having at least one phase modulation element. For example, the optical system unit may include one light emitting element that emits white laser light and one phase modulation element that receives white laser light emitted from the light emitting element.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which can shorten the time until it projects a desired image is provided, and it can be utilized in the field of vehicle lamps, such as a motor vehicle.

1 ... headlight (vehicle lamp)
Reference Signs List 10 housing 20 lamp unit 50 optical system unit 51 light source 51R, 51G, 51B light emitting element 51T test light emitting element 53 phase modulation unit 53R , 53G, 53B, 53S... Phase modulator 53T... Test phase modulators 54R, 54G, 54B... Light receiving optical system 55... Synthetic optical system 55f. · Second optical element 71 ··· control units 80R, 80G, 80B and 80S ··· spectral parts 81R, 81G, 81B, 81S and 81T ··· Fourier transform lenses 82R, 82G, 82B, 82S and 82T ··· Image sensor 85: Projection lens

Claims (15)

A light source for emitting light,
Includes a plurality of two-dimensionally arranged dots into which light from the light source is incident, and a phase modulation unit that modulates the phase of the incident light for each of the plurality of dots.
An image sensor that receives a part of light emitted from the phase modulation unit,
A control unit;
With
The image sensor receives the part of the formed light,
The control unit includes:
A first control process of controlling the phase modulation unit so that a phase distribution of light emitted from the phase modulation unit becomes a first phase distribution;
A first image acquisition process of acquiring, as a first image, the partial light emitted from the phase modulation unit that has been subjected to the first control process and received by the image sensor;
A second image calculation process for calculating a second image obtained by bringing the first image closer to the target image;
A second phase distribution calculation process of calculating a second phase distribution obtained by converting the luminance distribution of the second image into a phase distribution;
A second control process of controlling the phase modulation unit such that a phase distribution of light emitted from the phase modulation unit becomes the second phase distribution;
A third image acquisition process of acquiring, as a third image, the partial light emitted from the phase modulation unit that has been subjected to the second control process and received by the image sensor;
A fourth image calculation process of calculating a fourth image obtained by transposing the pixel array of the third image;
A third phase distribution calculation process of calculating a third phase distribution obtained by converting the luminance distribution of the fourth image into a phase distribution;
Calculating a fourth phase distribution obtained by adding a random phase distribution to the third phase distribution, and replacing the fourth phase distribution with the first phase distribution;
A target phase distribution corresponding to the target image is calculated by a phase distribution generation process including: The second image compares each pixel in the first image with each pixel in the target image, and calculates a brightness of each pixel in the first image from a brightness of a corresponding pixel in the target image. 2. The vehicular lamp according to claim 1, wherein an image in which the luminance of a pixel larger than a predetermined value is replaced by a luminance smaller than the luminance is also used. The vehicular lamp according to claim 1, wherein the wavelength band of the partial light is at least a part of a wavelength band included in another partial light emitted from the phase modulation unit. The vehicular lamp according to any one of claims 1 to 3, further comprising a Fourier transform lens that forms an image of the partial light. 4. The vehicular lamp according to claim 1, wherein the control unit controls the phase modulation unit to form an image of the partial light emitted from the phase modulation unit. 5. . The vehicular lamp according to claim 5, further comprising a projection lens that adjusts a divergence angle of another part of the light emitted from the phase modulation unit. The vehicular lamp according to any one of claims 1 to 6, further comprising a spectroscopy unit that separates the light emitted from the phase modulation unit into the partial light and the other partial light. . The spectroscopic unit may change a separation ratio of the part of the light with respect to the other part of the light, and may increase the separation ratio at least at the time of the third image acquisition processing. Item 8. The vehicle lamp according to item 7. The vehicular lamp according to claim 8, wherein the light source adjusts the intensity of the emitted light in accordance with a change in the separation ratio. The light source has a plurality of light emitting elements,
The part of the light and the other part of the light are emitted from the separate light emitting elements,
The vehicular lamp according to any one of claims 1 to 6, wherein the part of the light is received by the image sensor without being combined with the other part of the light. . The vehicular lamp according to claim 10, wherein the part of the light is not emitted from the light emitting element when the control unit does not perform the phase distribution generation processing. The light source has a plurality of light emitting elements,
The phase modulation unit has a plurality of phase modulation elements provided for each of the plurality of light emitting elements,
The vehicular lamp according to any one of claims 1 to 11, wherein at least two of the light emitting elements emit light having different wavelength bands. The image sensor is provided for each of at least two phase modulation elements respectively corresponding to the at least two light emitting elements that emit light having different wavelength bands,
The target image is provided for each of the at least two light emitting elements,
The vehicular lamp according to claim 12, wherein the control unit calculates the target phase distribution by the phase distribution generation processing for each of the at least two light emitting elements. The light source has a plurality of light emitting elements,
The phase modulation unit has at least one phase modulation element,
At least two of the light emitting elements emit light having different wavelength bands from each other,
The at least two light emitting elements that emit the light having different wavelength bands from each other emit the light alternately for each light emitting element.
The plurality of lights emitted from the at least two light emitting elements enter a common phase modulation element,
2. The phase modulation element on which the light from the at least two light emitting elements is incident modulates the phase of the light for each of the plurality of dots according to a wavelength band of the incident light. 12. The vehicle lighting device according to any one of items 1 to 11. The image sensor is provided for the phase modulation element on which the light from the at least two light emitting elements is incident,
The target image is provided for each of the at least two light emitting elements,
The vehicular lamp according to claim 14, wherein the control unit calculates the target phase distribution by the phase distribution generation processing for each of the at least two light emitting elements.

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