Vehicle lamp

Abstract

The present invention suppresses a decline in the appearance of a pattern irradiated on a road surface. The vehicle lamp includes: a light source; a plate-shaped light source-side lens that has a metasurface section that converts the wavefront of the light from the light source, and that emits the wavefront-converted light; a light shielding member having a slit through which a part of the emitted light passes; and a projection lens that forms an irradiation pattern by irradiating the road surface with light that has passed through a slit formed so as to have a longitudinal direction in one direction, the metasurface portion having a column portion, the metasurface portion includes a plurality of column portions disposed at a predetermined pitch in a first direction parallel to a longitudinal direction of the slit and a second direction orthogonal to the first direction about a reference position corresponding to an optical axis of the light source side lens, and the metasurface portion has a central region including the reference position. The center region includes a portion in which the diameter of the column portion gradually decreases as the distance from the reference position increases, and in the center region, the change in the diameter of the column portion on one side in the first direction is gentle than the change in the diameter of the column portion on the other side in the first direction with respect to the reference position.

Description

Technical Field

[0001] The present disclosure relates to vehicle lamps. Background Art

[0002] There is known a vehicle lamp that can irradiate a pattern on a road surface (for example, refer to Patent Document 1).

[0003] In addition, in a vehicle lamp, as a condenser lens that condenses light from a light source, a structure having a so-called meta-lens is known (for example, refer to Patent Document 2). Further, there is known a vehicle lamp having a light source-side lens that condenses light from a light source, a lamp shade that shields a part of the light condensed by the light source-side lens, and a projection lens that projects the light passing through the lamp shade in front of the vehicle. In such a vehicle lamp, as the light source-side lens, a structure having a so-called meta-lens is known (for example, refer to Patent Document 2). The meta-lens is, for example, plate-shaped and has a metasurface portion that changes the wavefront of light from the light source.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-111465

[0007] Patent Document 2: International Publication No. 2022 / 025031 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] The vehicle lamp described in Patent Document 1 has a structure in which a condenser lens condenses light from a light source toward a slit of a light-shielding member, and a projection lens irradiates the light that has passed through the slit onto the road surface. In this structure, a convex lens is used as the condenser lens. Therefore, corresponding to the thickness of the convex lens, it is necessary to dispose the exit surface of the convex lens on the light-shielding member side, and it is necessary to increase the condensing angle toward the slit. If the condensing angle of the condenser lens becomes large, the light passing through the slit enters the outer peripheral side of the projection lens, and thus is likely to be affected by the aberration of the projection lens. In this case, there is a possibility that the edge portion of the pattern formed on the road surface becomes blurred and the appearance of the pattern such as color fringes is generated.

[0010] In addition, in such a vehicle lamp described in Patent Document 2, if light enters a portion of the meta-lens other than the metasurface portion, there is a possibility that the light becomes stray light when it exits the meta-lens.

[0011] In addition, in the vehicle lamp described in Patent Document 2, the lamp cover is treated as a single component. In this structure, when assembling, it is necessary to accurately align the light source-side lens and the lamp cover, which imposes a large burden.

[0012] The present disclosure is a solution proposed in view of the above circumstances, and aims to provide a vehicle lamp capable of suppressing a deterioration in the appearance of a pattern irradiated on a road surface, a vehicle lamp capable of suppressing light from entering a portion of the condenser lens different from the metasurface portion, and a vehicle lamp capable of reducing the burden during assembly.

[0013] Solution to the problem

[0014] The vehicle lamp according to the first aspect of the present invention includes: a light source that emits light; a light source-side lens that is plate-shaped and has a metasurface portion that transforms the wavefront of the light from the light source and emits the light with the wavefront transformed; a light-shielding member that has a slit that allows a part of the light emitted from the light source-side lens to pass through; and a projection lens that irradiates the light that has passed through the slit onto a road surface to form an irradiation pattern. The slit is formed to have a long-side direction in one direction. The metasurface portion has column portions that are arranged at a predetermined pitch in a first direction parallel to the long-side direction of the slit and a second direction orthogonal to the first direction with a reference position corresponding to the optical axis of the light source-side lens as the center. The metasurface portion has a central region that includes the reference position and includes a portion where the diameter of the column portions gradually decreases as the distance from the reference position increases. In the central region, the change in the diameter of the column portions on one side in the first direction with respect to the reference position is gentler than the change in the diameter of the column portions on the other side in the first direction.

[0015] According to the vehicle lamp of the second aspect of the present invention based on the vehicle lamp of the first aspect, in the central region of the metasurface portion, the change in the diameter of the column portions is the same on one side and the other side in the second direction starting from the reference position.

[0016] According to the vehicle lamp of the third aspect of the present invention based on the first or second aspect, in the central region of the metasurface portion, the change in the diameter of the column portions on one side in the first direction starting from the reference position is gentler than the change in the diameter of the column portions on one side or the other side in the second direction starting from the reference position.

[0017] According to the vehicle lamp described in any one of the first to third aspects of the present invention, in the central region of the metasurface portion, the change in the diameter of the pillar portion on the other side of the first direction from the reference position is sharper than the change in the diameter of the pillar portion on one or the other side of the second direction from the reference position.

[0018] According to the vehicle lamp described in any one of the first to fourth aspects of the present invention, in the central region of the metasurface portion, the peak position where the diameter of the pillar portion becomes the largest in the first direction is arranged on one side closer to the reference position.

[0019] According to the vehicle lamp described in any one of the first to fifth aspects of the present invention, in the central region, based on the reference position, the number of pillar portions in the first direction is larger than the number of pillar portions in the second direction.

[0020] According to the vehicle lamp described in any one of the first to sixth aspects of the present invention, in the central region, the number of pillar portions arranged on one side of the first direction from the reference position is more than 20% larger than the number of pillar portions respectively arranged on one side and the other side of the second direction from the reference position, and the number of pillar portions arranged on the other side of the first direction from the reference position is less than 10% of the number of pillar portions respectively arranged on one side and the other side of the second direction from the reference position.

[0021] According to the vehicle lamp described in any one of the first to seventh aspects of the present invention, the metasurface portion sets the phase distribution in such a way that the phase changes periodically in the radial direction along the incident surface from the central portion including the reference position. The central region is a region corresponding to the first period of the phase distribution including the reference position. The metasurface portion has a peripheral region, which is formed in a ring shape surrounding the central region and corresponds to the periods after the second period of the phase distribution. The peripheral region is formed such that the diameter of the pillar portion gradually decreases as it moves away from the central region along the incident surface.

[0022] According to the vehicle lamp of the ninth aspect described above, the peripheral region is provided with multiple layers in the direction of moving away from the central region to the outside, and the number of peak positions where the diameter of the pillar portion on the other side is the largest is larger than that on one side of the first direction.

[0023] The vehicle lamp according to the tenth aspect of the present invention includes: a light source that emits light; a condenser lens that condenses the light emitted from the light source; and a projection lens that irradiates the light condensed by the condenser lens to form an irradiation pattern. The condenser lens is a flat plate shape having an incident surface into which light from the light source enters and an exit surface that emits the light incident from the incident surface. The incident surface has a metasurface portion that transforms the wavefront of the light from the light source into a converging direction. A stray light suppression portion is further provided, and the stray light suppression portion shields the light that enters a portion of the condenser lens different from the metasurface portion.

[0024] According to the vehicle lamp of the tenth aspect of the present invention, in the eleventh aspect of the present invention, the stray light suppression portion is provided on the condenser lens.

[0025] According to the vehicle lamp of the tenth aspect or the eleventh aspect of the present invention, in the twelfth aspect of the present invention, the stray light suppression portion is provided around the metasurface portion in the incident surface of the condenser lens.

[0026] According to the vehicle lamp described in any one of the tenth aspect to the twelfth aspect of the present invention, in the thirteenth aspect of the present invention, it further includes: a light source substrate on which the light source is mounted; and a frame member that is fixed to the light source substrate and supports the condenser lens. The condenser lens is joined to the frame member via a bonding layer, and the stray light suppression portion includes at least a part of the bonding layer.

[0027] According to the vehicle lamp described in any one of the tenth aspect to the thirteenth aspect of the present invention, in the fourteenth aspect of the present invention, it further includes: a cover member that supports the incident surface of the condenser lens, covers the metasurface portion, and allows the light from the light source to pass through on the metasurface portion side; and a spacer that is disposed between the cover member and the incident surface, and the stray light suppression portion is provided on the spacer.

[0028] According to the vehicle lamp described in any one of the tenth aspect to the fourteenth aspect of the present invention, in the fifteenth aspect of the present invention, it further includes a light shielding member that has a slit through which a part of the light condensed by the condenser lens passes. The projection lens irradiates the light that has passed through the slit onto the road surface to form the irradiation pattern, and the stray light suppression portion is provided between the light source and the light shielding member.

[0029] The vehicle lamp according to the sixteenth aspect of the present invention includes: a light source that emits light; a light source-side lens that has an incident surface into which light from the light source enters, a metasurface portion provided on the incident surface and transforming the wavefront of the light, an exit surface that emits the light with the wavefront transformed, and a light-shielding portion provided on the exit surface and having a slit that allows a part of the light to pass through; and a projection lens that irradiates the light that has passed through the slit in the light source-side lens to form an irradiation pattern.

[0030] In the vehicle lamp according to the seventeenth aspect of the present invention based on the sixteenth aspect, the light-shielding portion is formed in a thin film shape using a metal material.

[0031] In the vehicle lamp according to the eighteenth aspect of the present invention based on the sixteenth aspect or the seventeenth aspect, the light-shielding portion has a first opening portion that constitutes the slit.

[0032] In the vehicle lamp according to the nineteenth aspect of the present invention based on any one of the sixteenth aspect to the eighteenth aspect, it further includes: a light source substrate on which the light source is mounted; and a frame member that is fixed to the light source substrate, the light source-side lens is supported by the frame member, and a positioning portion is provided on at least one of the light source-side lens and the frame member.

[0033] In the vehicle lamp according to the twentieth aspect of the present invention based on the nineteenth aspect, the light-shielding portion has a second opening portion corresponding to the positioning portion.

[0034] In the vehicle lamp according to the twenty-first aspect of the present invention based on the nineteenth aspect, the light source substrate has a mounting surface on which the light source is mounted, the frame member is fixed to the mounting surface, and it further includes a connector that is provided on a surface of the light source substrate opposite to the mounting surface and is connected to the outside.

[0035] In the vehicle lamp according to the twenty-second aspect of the present invention based on any one of the sixteenth aspect to the twenty-first aspect, one such light source is provided.

[0036] In the vehicle lamp according to the twenty-third aspect of the present invention based on any one of the sixteenth aspect to the twenty-second aspect, in the metasurface portion, the dimension in the short side direction of the slit is larger than the slit, and the dimension in the long side direction of the slit is smaller than the slit.

[0037] Advantages of the Invention

[0038] According to the present disclosure, it is possible to provide a vehicle lamp that can suppress the appearance degradation of the pattern irradiated on the road surface, a vehicle lamp that can suppress light from entering a portion of the condenser lens different from the metasurface portion, and a vehicle lamp that can reduce the burden during assembly. Description of the Drawings

[0039] Figure 1 It is an exploded perspective view showing an example of a vehicle lamp according to the first embodiment.

[0040] Figure 2 It is a view showing the state of the vehicle lamp as observed from the front.

[0041] Figure 3 It is a view showing an example of a light source side lens.

[0042] Figure 4 It is a view showing an example of the phase distribution in the metasurface portion.

[0043] Figure 5 It is a view showing an example of observing the metasurface portion in the axial direction of the optical axis.

[0044] Figure 6 It is showing Figure 5 a view of the change in the diameter of the column portion in the metasurface portion shown in

[0045] Figure 7 It is a view showing an example of the operation of the vehicle lamp according to the first embodiment.

[0046] Figure 8 It is a view showing an example of the operation of the vehicle lamp according to the first embodiment.

[0047] Figure 9 It is a view showing an example of the irradiation pattern formed on the road surface by the vehicle lamp.

[0048] Figure 10 It is a perspective view showing an example of a vehicle lamp according to the second embodiment.

[0049] Figure 11 It is an exploded perspective view showing an example of a vehicle lamp according to the second embodiment.

[0050] Figure 12 It is a view showing the state of the vehicle lamp as observed from the axial direction of the optical axis.

[0051] Figure 13 It is a view showing an example of a condenser lens.

[0052] Figure 14 It is a view showing an example of the operation of the vehicle lamp according to the second embodiment.

[0053] Figure 15 It is a view showing an example of the irradiation pattern formed on the road surface by the vehicle lamp.

[0054] Figure 16It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in the vehicle lamp of the second embodiment.

[0055] Figure 17 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in the vehicle lamp of the second embodiment.

[0056] Figure 18 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in the vehicle lamp of the second embodiment.

[0057] Figure 19 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in the vehicle lamp of the second embodiment.

[0058] Figure 20 It is a perspective view showing an example of the condenser lens.

[0059] Figure 21 It is a perspective view showing an example of the condenser lens.

[0060] Figure 22 It is a perspective view showing an example of the condenser lens.

[0061] Figure 23 It is a perspective view showing an example of the condenser lens.

[0062] Figure 24 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in another example of the vehicle lamp.

[0063] Figure 25 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in another example of the vehicle lamp.

[0064] Figure 26 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in another example of the vehicle lamp.

[0065] Figure 27 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in another example of the vehicle lamp.

[0066] Figure 28 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in another example of the vehicle lamp.

[0067] Figure 29 It is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in another example of the vehicle lamp.

[0068] Figure 30 This is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in a vehicle lamp representing another example.

[0069] Figure 31 This is a diagram showing the structure of the fixed parts of the light source unit, the condenser lens, and the frame member in a vehicle lamp representing another example.

[0070] Figure 32 This is a perspective view showing the structure of the condenser lens of a modified example.

[0071] Figure 33 This is a perspective view showing the structure of the frame member of a modified example.

[0072] Figure 34 This is an exploded perspective view showing an example of a vehicle lamp of the third embodiment.

[0073] Figure 35 This is an exploded perspective view showing an example of a vehicle lamp of the third embodiment.

[0074] Figure 36 This is a diagram showing an example of the state in which the vehicle lamp of the third embodiment is assembled.

[0075] Figure 37 This is a diagram showing an example of the state in which the vehicle lamp of the third embodiment is assembled.

[0076] Figure 38 This is a diagram showing an example of the state in which the vehicle lamp of the third embodiment is assembled.

[0077] Figure 39 This is a diagram showing an example of the light source side lens of the third embodiment.

[0078] Figure 40 This is a diagram showing an example of the light source side lens of the third embodiment.

[0079] Figure 41 This is a diagram showing an example of the light source side lens of the third embodiment.

[0080] Figure 42 This is a diagram showing an example of the operation of the vehicle lamp of the third embodiment.

[0081] Figure 43 This is a diagram showing an example of the operation of the vehicle lamp of the third embodiment.

[0082] Figure 44 This is a diagram showing an example of the irradiation pattern formed on the road surface by the vehicle lamp. Detailed Implementation Modes

[0083] <First Embodiment>

[0084] Hereinafter, a first embodiment of a vehicle lamp according to the present disclosure will be described with reference to the drawings. In addition, the present invention is not limited to this embodiment. In addition, the constituent elements in the following embodiments include constituent elements that can be replaced and are easily replaceable by those skilled in the art, or constituent elements that are substantially the same.

[0085] Figure 1 is an exploded perspective view showing an example of the vehicle lamp 100 of the first embodiment. Figure 2 is a view showing the state of observing the vehicle lamp 100 from the front. As Figure 1 and Figure 2 shown, the vehicle lamp 100 includes a light source unit 10, a light source-side lens 80, a light-shielding member 30, a projection lens 40, and a support member 50.

[0086] The light source unit 10 includes a light source 11 and a substrate 12. The light source 11 is, for example, a semiconductor-type light source such as an LED. The light source 11 has a light-emitting surface 11a that emits light. The light-emitting surface 11a is disposed opposite to the incident surface 80a of the light source-side lens 80. The light source 11 emits light of a single color, for example, orange (amber) light, from the light-emitting surface 11a. For example, one light source 11 is disposed. In addition, a plurality of light sources 11 may also be provided. In addition, the color of the light emitted from the light-emitting surface 11a is not limited to orange.

[0087] The substrate 12 mounts the light source 11. The substrate 12 is formed with wirings, circuits, etc. that transmit signals to the light source 11. The substrate 12 is fixed to a base portion 51 of a support member 50 described later.

[0088] The light source-side lens 80 emits the light emitted from the light source 11 toward the light-shielding member 30 side. The light source-side lens 80 is formed of a light-transmitting material such as quartz glass into, for example, a plate shape such as a flat plate shape. The light source-side lens 80 can be formed to have a thickness (dimension in the front-rear direction) of about 0.1 mm to 1 mm. The light source-side lens 80 can be fixed to the substrate 12 or can be fixed to the base portion 51 of the support member 50 described later. Figure 3 is a view showing an example of the light source-side lens 80. In addition, in Figure 3 in addition to the light source-side lens 80, the light source unit 10 and the light-shielding member 30 described later are also shown.

[0089] As Figure 3 shown, the light source-side lens 80 has an incident surface 80a and an exit surface 80b. The incident surface 80a and the exit surface 80b are, for example, planar. In addition, the incident surface 80a and the exit surface 80b may also be curved surfaces. The light source-side lens 80 is disposed such that the incident surface 80a faces the light source 11 and the exit surface 80b faces the light-shielding member 30.

[0090] The light source side lens 80 is a so-called metasurface lens having a metasurface portion 81, for example, on the surface of the light source side lens 80, such as an incident surface 80a. In addition, the metasurface portion 81 may also be provided on the exit surface 80b. The metasurface portion 81 can adopt a structure provided on at least one of the incident surface 80a and the exit surface 80b. The metasurface portion 81 transforms the incident wave surface from the light source 11 toward the slit 33 described later. The metasurface portion 81 is formed using, for example, GaN (gallium nitride), Si3N4 (silicon nitride), or the like. By the action of the metasurface portion 81 provided on the incident surface 80a, the wave surface of the light incident from the incident surface 80a is transformed toward the slit 33 described later and exits from the exit surface 80b. Therefore, the light exiting from the exit surface 80b is in a state of being condensed in the same manner as when exiting from the lens surface of a convex lens, that is, it converges toward the optical axis AX side in accordance with the shape of the slit 33 of the light shielding member 30 described later.

[0091] The metasurface portion 81 has a plurality of column portions 82. The column portions 82 are columnar and protrude from the incident surface 80a toward the light source 11 side. The plurality of column portions 82 are arranged in a matrix at a predetermined pitch, for example, in the left-right direction and the front-back direction. The dimensions of the plurality of column portions 82 in a predetermined direction are each 2 times or less the wavelength of the light emitted from the light source 11. In this way, by setting the dimensions of the plurality of column portions 82 in a predetermined direction to 2 times or less the wavelength of the light from the light source 11, the stability of the phase becomes higher, it is easier to manufacture, and thus the cost can be reduced. In the present embodiment, for the predetermined direction, it can be set to any dimension in the front-back direction or the left-right direction, for example.

[0092] The plurality of column portions 82 can be formed by techniques such as electron beam lithography and ion etching, for example. In addition, in the light source side lens 80, the metasurface portion 81 and the portion other than the metasurface portion 81 can be made of materials having different dielectric constants and permeabilities.

[0093] In the light source side lens 80, the metasurface portion 81 is set in the range where the light emitted from the light source 11 at an emission angle of a predetermined angle α or less enters. That is, on the incident surface 80a of the light source side lens 80, a plurality of column portions 82 are formed in the range where the light emitted from the light source 11 at an emission angle of a predetermined angle α or less enters. In addition, the light source side lens 80 is formed with a plurality of column portions 82 in such a manner that the converging angle of the light traveling toward the light shielding member 30 is, for example, a predetermined angle β or less with respect to the optical axis AX side in the horizontal direction.

[0094] In the present embodiment, the distance between the substrate 12 and the incident surface 80a of the light source side lens 80 is set as D1, the distance from the incident surface 80a to the light shielding member 30 is set as D2, regarding the slit 33 of the light shielding member 30 described later, the distance from the optical axis AX to both ends in the left - right direction is set as D3, and regarding the metasurface portion 81, the dimension from the optical axis AX to both ends in the left - right direction is set as D4. Here, when the distance D1 is set to 2.5 mm, the distance D2 is set to 13.5 mm, the distance D3 is set to 2 mm, and the distance D4 is set to 4.0 mm, the predetermined angle α can be set to, for example, 60°, and the predetermined angle β can be set to, for example, 15°. In addition, the values of each of the distances D1 to D4 and the values of the predetermined angles α and β are not limited to the above values. The specific structure of the metasurface portion 81 will be described later.

[0095] Return Figure 1 and Figure 2 The light shielding member 30 has a slit forming portion 31 and a frame portion 32. In the light shielding member 30, the slit forming portion 31 and the frame portion 32 are formed as a single member in a flat plate shape. The entire light shielding member 30 is formed using a material that can block light. As such a material, for example, materials such as metals can be cited, but other materials can also be used. In addition, the light shielding member 30 may have a structure in which the slit forming portion 31 and the frame portion 32 are formed of different members.

[0096] The slit forming portion 31 is, for example, circular in shape. The slit forming portion 31 has a slit 33. The slit 33 allows a part of the light emitted from the light source side lens 80 to pass through. The slit 33 is formed, for example, in a state where three are arranged in the up - down direction. The number and arrangement of the slits 33 are not limited to the above. In the present embodiment, the slit 33 is formed as a whole to have a long side direction in one direction, for example, the up - down direction. In addition, the slit 33 may have a structure in which, as a whole, it has a long side direction in a direction different from the up - down direction, such as the left - right direction or the inclined direction.

[0097] The frame portion 32 projects linearly from the slit forming portion 31 in the left - right direction. The frame portion 32 has a shape with rounded corners on both sides in the left - right direction. The front and rear surfaces of the frame portion 32 are flat. The frame portion 32 has a positioning opening 32a and a fixing opening 32b. The positioning opening 32a is for inserting a positioning projection 53a of a support member 50 described later. The fixing opening 32b is for inserting a fixing member 90 described later.

[0098] Viewed from the front, the light shielding member 30 is formed so as to cover the light source side lens 80. With this structure, the light passing through the light source side lens 80 can be blocked by the light shielding member 30.

[0099] The projection lens 40 has a lens part 41, a cylindrical part 42, and a frame part 44. The lens part 41 projects the light that has passed through the slit 33 onto the road surface in front of the vehicle to form an illumination pattern. In the projection lens 40, the lens part 41, the cylindrical part 42, and the frame part 44 are formed as one component. In addition, the projection lens 40 may also be structured such that at least one of the lens part 41, the cylindrical part 42, and the frame part 44 is formed of different components. The lens part 41 is formed of a material that allows the light from the light source 11 to pass through. As such a material, for example, resin materials such as propylene can be cited, but other materials can also be used. In this case, by integrally molding using the material that constitutes the lens part 41, the entire projection lens 40 can be easily formed. The projection lens 40 is structured to be formed as a whole using a material different from that of the light source-side lens 80, but it can also be formed as a whole using the same material as the light source-side lens 80. In addition, in the projection lens 40, at least a part of the portions different from the lens part 41, that is, the cylindrical part 42 and the frame part 44, can also be formed using a material different from that of the lens part 41.

[0100] The lens part 41 has an incident surface 41a and an exit surface 41b (refer to Figure 7 ). The incident surface 41a allows the light that has passed through the slit 33 to enter. The exit surface 41b emits the light that has entered from the incident surface 41a forward.

[0101] The cylindrical part 42 holds the lens part 41. The cylindrical part 42 is, for example, cylindrical. The cylindrical part 42 connects between the lens part 41 and the frame part 44. The cylindrical part 42 is provided so as to project forward with respect to the frame part 44. With this structure, the lens part 41 is in a state of being disposed in front of the frame part 44.

[0102] The frame portion 44 holds the lens portion 41 via the cylindrical portion 42. The frame portion 44 is flat plate-shaped. The frame portion 44 has an annular portion 45 that projects upward and downward from the cylindrical portion 42, and a strip-shaped portion 46 that projects left and right from the cylindrical portion 42. The annular portion 45 is formed in an annular shape along the outer periphery of the cylindrical portion 42. The strip-shaped portion 46 is arranged linearly in the left and right directions from the cylindrical portion 42. The corner portions on both sides in the left and right directions of the strip-shaped portion 46 are rounded. The strip-shaped portion 46 has a positioning opening 46a and a fixing opening 46b. The positioning projection 53a of the support member 50 described later is inserted into the positioning opening 46a. The fixing member 90 described later is inserted into the fixing opening 46b. The strip-shaped portion 46 has contact portions 46c, 46d. The contact portion 46c is arranged along the outer periphery of the positioning opening 46a and projects rearward from the strip-shaped portion 46. The contact portion 46d is arranged along the outer periphery of the fixing opening 46b and projects rearward from the strip-shaped portion 46. The front end surfaces in the projecting directions of the contact portions 46c, 46d are formed in a planar shape. The frame portion 44 contacts the light shielding member 30 at the contact portions 46c, 46d. According to this structure, by appropriately defining the dimensions such as the height in the projecting directions of the contact portions 46c, 46d in the strip-shaped portion 46, the positional accuracy of the frame portion 44 can be ensured.

[0103] The support member 50 has a base portion 51, fins 52, and a fixing portion 53. The base portion 51 is flat plate-shaped. The base portion 51 has a support surface 51a for supporting the light source portion 10. The support surface 51a is the front surface of the base portion 51 and supports the substrate 12.

[0104] The fins 52 project rearward from the base portion 51. A plurality of fins 52 are provided. The fins 52 dissipate the heat generated in the light source 11.

[0105] The fixing portion 53 projects forward from the support surface 51a of the base portion 51. The fixing portion 53 fixes the frame portion 32 and the frame portion 44. The fixing portion 53 has a positioning projection 53a and a fixing opening 53b. The positioning projection 53a and the fixing opening 53b are provided on the front end surface 53c of the fixing portion 53.

[0106] The positioning projection 53a projects forward and penetrates in the front-rear direction through the positioning opening 32a provided in the frame portion 32 and the positioning opening 46a in the strip-shaped portion 46 of the frame portion 44. The fixing opening 53b is for inserting the fixing member 90 described later.

[0107] The end surface 53c is formed in a planar shape, for example. The end surface 53c is formed perpendicular or substantially perpendicular to the optical axis AX.

[0108] The fixing member 90 fixes the frame portion 32 and the frame portion 44 to the fixing portion 53. The fixing member 90 uses a connecting member such as a screw. The fixing member 90 passes through the fixing opening 32b provided in the frame portion 32, the fixing opening 46b of the strip portion 46 provided in the frame portion 44, and is inserted into the fixing opening 53b of the fixing portion 53.

[0109] Next, the structure of the metasurface portion 81 will be specifically described. Figure 4 It is a diagram showing an example of the phase distribution in the metasurface portion 81. As Figure 4 shown, the metasurface portion 81 sets the phase distribution in such a manner that the phase periodically changes in the radial direction along the incident surface 80a from a reference region 81a including a reference position Q corresponding to the optical axis AX of the light source-side lens 80. Specifically, the metasurface portion 81 has a portion corresponding to a first period, in which the phase changes from 2π to 0 in the radial direction from the reference region 81a in the phase distribution. In the present embodiment, the portion corresponding to this first period is the central region 83.

[0110] The metasurface portion 81 has portions corresponding to each period after the second period outside the central region 83. The phase of the portion corresponding to the second period changes from 2π to 0 in the radial direction from the outer peripheral portion of the central region 83. In the present embodiment, the portion corresponding to this second period is the peripheral region 84. In addition, the phase of the portion corresponding to the third period in the phase distribution changes from 2π to 0 in the radial direction from the outer peripheral portion of the peripheral region 84. In the present embodiment, the portion corresponding to this third period is the peripheral region 85. In addition, the phase of the portion corresponding to the fourth period in the phase distribution decreases from 2π in the radial direction from the outer peripheral portion of the peripheral region 85. In the present embodiment, the portion corresponding to this fourth period is the peripheral region 86.

[0111] Figure 5 It is a diagram schematically showing an example of the case of observing the metasurface portion 81 from the axial direction of the optical axis AX. As Figure 5 shown, in the metasurface portion 81, a plurality of column portions 82 are arranged at a predetermined interval in a first direction C1 and a second direction C2 with the reference position Q as the center throughout the entire central region 83 and the peripheral regions 84, 85, and 86. The first direction C1 is a direction parallel to the long side direction of the slit 33 along the incident surface 80a. The second direction C2 is a direction orthogonal to the first direction C1 along the incident surface 80a. In the present embodiment, the first direction C1 is the up-down direction, and the second direction C2 is the left-right direction.

[0112] In the metasurface portion 81, the central region 83 includes the reference position Q and has a portion where the diameter of the column portion 82 becomes smaller as it moves away from the reference position Q. In the central region 83, in the above-mentioned reference region 81a (refer to Figure 4, Figure 5 ) In this case, the diameter of the column portion 82 becomes the largest. In the present embodiment, the diameters of the column portions 82 disposed in the reference region 81a are the same. In the central region 83, as the distance from the reference region 81a in the radial direction increases, the diameter of the column portion 82 gradually decreases.

[0113] In the central region 83 and in the reference region 81a, the central positions in the first direction C1 and the second direction C2 are the peak positions 81b where the diameter of the column portion 82 becomes the largest. The peak position 81b is a position shifted downward in the first direction C1 with respect to the reference position Q. In this way, the peak position 81b is disposed below the reference position Q in the first direction C1.

[0114] In the central region 83, based on the reference position Q, the number of column portions 82 in the first direction C1 is larger than the number of column portions 82 in the second direction C2. In the central region 83, the number of column portions 82 disposed on the lower side of the first direction C1 starting from the reference position Q is more than 20% larger than the number of column portions 82 disposed on the left side and the right side of the second direction C2 starting from the reference position Q, respectively. In addition, the number of column portions 82 disposed on the upper side of the first direction C1 starting from the reference position Q is less than 10% smaller than the number of column portions 82 disposed on the left side and the right side of the second direction C2 starting from the reference position Q, respectively. In addition, the number of the above-mentioned column portions 82 in the first direction C1 and the second direction C2 does not include the column portion 82 at the reference position Q. In addition, the number of the above-mentioned column portions 82 is an example and is not limited to the above number.

[0115] Figure 6 It represents Figure 5 a graph showing the change in the diameter of the column portion 82 in the metasurface portion 81 shown. In Figure 6 , the change in diameter from the reference position Q toward the lower side (one side of the first direction) and the upper side (the other side of the first direction) of the first direction C1 is represented by blank squares and a dotted line, and the change in diameter from the reference position Q toward the left side (one side of the second direction) and the right side (the other side of the second direction) of the second direction C2 is represented by black circles and a solid line.

[0116] As shown in Figure 5 and Figure 6As shown, in the central region 83, with respect to the reference position Q, compared to the upper side of the first direction C1, the change in the diameter of the column portion 82 on the lower side of the first direction C1 is gentle in the direction away from the reference position Q. That is, when leaving equal distances from the reference position Q to the lower side and the upper side of the first direction C1 respectively, in terms of the ratio of the change in the diameter of the column portion 82, the lower side is smaller than the upper side. In other words, in the central region 83, with respect to the reference position Q, compared to the lower side of the first direction C1, the change in the diameter of the column portion 82 on the upper side of the first direction C1 is sharp in the direction away from the reference position Q. That is, when leaving equal distances from the reference position Q to the lower side and the upper side of the first direction C1 respectively, in terms of the ratio of the change in the diameter of the column portion 82, the upper side is larger than the lower side.

[0117] In addition, in the central region 83, starting from the reference position Q, on the left side and the right side of the second direction C2, the change in the diameter of the column portion 82 is the same. That is, in the central region 83, when taking the reference position Q as a reference, the change in the diameter of the column portion 82 is symmetric in the second direction C2.

[0118] In the central region 83, the change in the diameter of the column portion 82 on the lower side of the first direction C1 starting from the reference position Q is gentler than the change in the diameter of the column portion 82 on the left side (or the right side) of the second direction C2 starting from the reference position Q. That is, when leaving equal distances from the reference position Q to the lower side of the first direction C1 and the left side (or the right side) of the second direction C2 respectively, in terms of the ratio of the change in the diameter of the column portion 82, the lower side of the first direction C1 is smaller than the left side (or the right side) of the second direction C2.

[0119] In the central region 83, the change in the diameter of the column portion 82 on the upper side of the first direction C1 starting from the reference position Q is sharper than the change in the diameter of the column portion 82 on the left side (or the right side) of the second direction C2 starting from the reference position Q. That is, when leaving equal distances from the reference position Q to the upper side of the first direction C1 and the left side (or the right side) of the second direction C2 respectively, in terms of the ratio of the change in the diameter of the column portion 82, the upper side of the first direction C1 is larger than the left side (or the right side) of the second direction C2.

[0120] In the central region 83, the column portion 82 with the largest diameter in the first direction C1 is arranged in the region extending downward from the reference position Q including the reference position Q. Specifically, the column portion 82 at the reference position Q and the multiple column portions 82 arranged downward from the reference position Q have the largest diameter in the first direction C1.

[0121] In addition, the peripheral regions 84, 85, and 86 are formed in a ring shape so as to surround the outer periphery of the central region 83. The peripheral regions 84, 85, and 86 are provided with multiple layers in the direction away from the central region 83 along the incident surface 80a. In each of the peripheral regions 84, 85, and 86, the column portion 82 is formed such that its diameter gradually decreases as it moves away from the central region 83 along the incident surface 80a. In the peripheral regions 84, 85, and 86, the number of peak positions 81c where the diameter of the column portion 82 on the upper side is the largest is larger than that on the lower side in the first direction C1.

[0122] Next, an example of the operation of the vehicle lamp 100 configured as described above will be described. Figure 7 and Figure 8 is a diagram showing an example of the operation of the vehicle lamp 100 according to the first embodiment. Figure 7 It is a view observed from above, Figure 8 and is a view observed from the left. In Figure 8 , the structure on the side of the light source 11 and the light source-side lens 80 is enlarged and shown. According to the driver's operation of the direction indicator or the like, or in conjunction with the lighting of the hazard warning lamp or the like, the vehicle lamp 100 emits light from the light-emitting surface 11a of the light source 11.

[0123] The light L emitted from the center of the light-emitting surface 11a enters the incident surface 80a of the light source-side lens 80, and through the action of the metasurface portion 81 provided on the incident surface 80a, the wavefront is transformed into a curved wavefront in the converging direction. The light L after the wavefront transformation is emitted forward from the exit surface 80b in such a manner that: in the first direction C1, the light diffuses downward, and the diffusion upward is suppressed (refer to Figure 8 ), and in the second direction C2, the light converges toward the optical axis AX side (refer to Figure 3 and Figure 7 ). In addition, in the present embodiment, the light L is emitted in a direction parallel or substantially parallel to the optical axis AX at the uppermost part in the first direction C1.

[0124] The light L emitted forward from the exit surface 80b reaches the slit forming portion 31 of the light shielding member 30. A part of the light L that reaches the slit forming portion 31 passes through the slit 33 of the light shielding member 30, and the remaining part is shielded by the light shielding member 30. In the present embodiment, through the metasurface portion 81, the light L reaches the slit forming portion 31 in a state of diffusing downward in the first direction C1, so that the light L is effectively supplied in a manner that covers the slit 33 having a long side direction in the first direction C1. The light L that has passed through the slit 33 enters the incident surface 41a of the lens portion 41 and is emitted from the exit surface 41b toward the front of the vehicle.

[0125] Figure 9 is a diagram showing an example of the irradiation pattern formed on the road surface by the vehicle lamp 100. As shown in Figure 9As shown, light L emitted in front of the vehicle forms an illumination pattern P having a long side direction in one direction on the road surface in front of the vehicle. The illumination pattern P is illuminated with sufficient brightness over the entire long side direction.

[0126] As described above, the vehicle lamp 100 of the present embodiment includes: a light source 11 that emits light; a light source side lens 80 that is plate-shaped and has a metasurface portion 81 that transforms the wavefront of the light from the light source 11 and emits the light with the wavefront transformed; a light shielding member 30 that has a slit 33 through which a part of the light condensed by the light source side lens 80 passes; and a projection lens 40 that irradiates the light passing through the slit 33 onto the road surface to form the illumination pattern P. The slit 33 is formed to have a long side direction in one direction. The metasurface portion 81 has a column portion 82 that is arranged at a predetermined interval in a first direction C1 parallel to the long side direction of the slit 33 and a second direction C2 orthogonal to the first direction C1 with a reference position Q corresponding to the optical axis of the light source side lens 80 as the center. The metasurface portion 81 has a central region 83 that includes the reference position Q and includes a portion where the diameter of the column portion 82 gradually decreases as it moves away from the reference position Q. With respect to the reference position Q, the change in the diameter of the column portion 82 on one side of the first direction C1 in the central region 83 of the metasurface portion 81 is gentler than that on the other side of the first direction C1.

[0127] According to this structure, the light source side lens 80 is a flat plate shape having an incident surface 80a and an exit surface 80b, and the metasurface portion 81 that transforms the wavefront of the light from the light source 11 into a converging wavefront is provided on the incident surface 80a. Therefore, compared with the case of using a convex lens, the thickness can be reduced. Thus, a structure can be formed in which the position of the exit surface 80b is arranged on the light source 11 side, and the condensing angle T toward the light shielding member 30 can be reduced. Therefore, the illumination pattern P can be formed without using a portion where the influence of aberration in the projection lens 40 is large, and the appearance degradation of the illumination pattern P can be reduced. In addition, in the structure where the slit 33 has a long side direction in one direction, in the central region 83 of the metasurface portion 81 with respect to the reference position Q, the change in the diameter of the column portion 82 on one side of the first direction C1 is gentler than that on the other side. Therefore, through the metasurface portion 81, the light L reaches the slit forming portion 31 in a state of being diffused downward in the first direction C1. Thus, the light L is effectively supplied so as to cover the slit 33 having a long side direction in one direction, and the illumination pattern P having a long side direction in one direction is illuminated with sufficient brightness over the entire long side direction. Thereby, the appearance degradation of the pattern irradiated on the road surface can be suppressed.

[0128] In the vehicle lamp 100 of the present embodiment, in the central region 83 of the metasurface portion 81, starting from the reference position Q, the change in the diameter of the column portion 82 is the same on one side and the other side of the second direction C2. According to this structure, light can reach the slit 33 with a uniform light amount in the second direction C2. As a result, the irradiation pattern P is irradiated with a uniform brightness in the short side direction.

[0129] In the vehicle lamp 100 of the present embodiment, in the central region 83 of the metasurface portion 81, the change in the diameter of the column portion 82 on one side of the first direction C1 starting from the reference position Q is gentler than the change in the diameter of the column portion 82 on one side or the other side of the second direction C2 starting from the reference position Q. According to this structure, the light L can be appropriately diffused downward in the first direction C1.

[0130] In the vehicle lamp 100 of the present embodiment, in the central region 83 of the metasurface portion 81, the change in the diameter of the column portion 82 on the other side of the first direction C1 starting from the reference position Q is steeper than the change in the diameter of the column portion 82 on one side or the other side of the second direction C2 starting from the reference position Q. According to this structure, the diffusion of the light L can be suppressed above the first direction C1, and the light L can be appropriately diffused downward.

[0131] In the vehicle lamp 100 of the present embodiment, in the central region 83 of the metasurface portion 81, the peak position 81b where the diameter of the column portion 82 becomes the largest in the first direction C1 is arranged on one side closer to the reference position Q. According to this structure, the light L can be appropriately diffused downward in the first direction C1.

[0132] In the vehicle lamp 100 of the present embodiment, in the central region 83, based on the reference position Q, the number of column portions 82 in the first direction C1 is larger than the number of column portions 82 in the second direction C2. According to this structure, the light L can be appropriately diffused downward in the first direction C1.

[0133] In the vehicle lamp 100 of the present embodiment, in the central region 83, the number of column portions 82 arranged on one side of the first direction C1 starting from the reference position Q is more than 20% larger than the number of column portions 82 respectively arranged on the left side and the right side of the second direction C2 starting from the reference position Q, and the number of column portions 82 arranged on the other side of the first direction C1 starting from the reference position Q is less than 10% smaller than the number of column portions 82 respectively arranged on the left side and the right side of the second direction C2 starting from the reference position Q. According to this structure, the light L can be appropriately diffused downward in the first direction C1.

[0134] In the vehicle lamp 100 of the present embodiment, the metasurface portion 81 sets the phase distribution such that the phase periodically changes from the reference position Q in the radial direction along the incident surface 80a. The central region 83 is a region corresponding to the first period of the phase distribution including the reference position Q. The metasurface portion 81 has peripheral regions 84, 85, and 86, which are formed in a ring shape so as to surround the central region 83 and correspond to the periods after the second period of the phase distribution. The peripheral regions 84, 85, and 86 are formed such that the diameter of the column portion 82 gradually decreases as it moves away from the central region 83 along the incident surface 80a. According to this structure, the light L can be appropriately diffused downward in the first direction C1.

[0135] In the vehicle lamp 100 of the present embodiment, the peripheral regions 84, 85, and 86 are provided in multiple layers in the direction of leaving the central region 83 toward the outside. Compared with one side of the first direction C1, the number of peak positions 81c where the diameter of the column portion 82 is the largest is larger on the other side. According to this structure, the light L can be appropriately diffused downward in the first direction C1.

[0136] The technical scope of the present disclosure is not limited to the above embodiments and can be appropriately changed without departing from the gist of the present disclosure. For example, in the above embodiment, the structure in which the vehicle lamp 100 is disposed at the front of the vehicle M is described as an example, but it is not limited thereto. The vehicle lamp 100 may also be a structure disposed at the rear or side of the vehicle M and is a structure that forms an irradiation pattern on the road surface behind or beside the vehicle M.

[0137] <Second Embodiment>

[0138] Hereinafter, a second embodiment of the vehicle lamp of the present disclosure will be described based on the drawings. In addition, the present invention is not limited to this embodiment. In addition, the constituent elements in the following embodiments include constituent elements that can be replaced by those skilled in the art and are easily replaceable, or substantially the same constituent elements.

[0139] Figures 10 to 12 It is a diagram showing an example of the vehicle lamp 200 of the second embodiment. Figure 10 It is a perspective view, Figure 11 It is an exploded perspective view, Figure 12 It is a view observed from the axial direction of the optical axis AX. As Figures 10 to 12 shown, the vehicle lamp 200 includes a light source unit 10, a condenser lens 20, a light shielding member 30, a projection lens 40, a support member 50, and a frame member 60.

[0140] The light source unit 10 includes a light source 11 and a substrate (light source substrate) 12. The light source 11 is, for example, a semiconductor light source such as an LED. The light source 11 has a light emitting surface 11a that emits light. The light emitting surface 11a is disposed opposite to the incident surface 20a of the condenser lens 20. The light source 11 emits light of a single color, for example, orange (amber) light, from the light emitting surface 11a. For example, one light source 11 is disposed. In addition, a plurality of light sources 11 may also be provided. Further, the color of the light emitted from the light emitting surface 11a is not limited to orange.

[0141] The substrate 12 has a mounting surface 12a. The light source 11 is mounted on the mounting surface 12a. The substrate 12 is formed with wirings, circuits, etc. for supplying power to the light source 11. The substrate 12 has openings 14 and 15. A threaded member 16 is inserted into the opening 14. The threaded member 16 fixes the substrate 12 to a base portion 51 of a support member 50 described later. A positioning pin 55 provided on the base portion 51 of the support member 50 described later is inserted into the opening 15.

[0142] The condenser lens 20 converges and emits the light emitted from the light source 11 toward the light shielding member 30 side. The condenser lens 20 is formed of a light transmissive material such as quartz glass into a plate shape such as a flat plate shape, for example. The condenser lens 20 can be formed to have a thickness (dimension in the front-rear direction) of about 0.1 mm to 1 mm. The condenser lens 20 can be fixed to the substrate 12 or can be fixed to the base portion 51 of the support member 50 described later. Figure 13 It is a diagram showing an example of the condenser lens 20. Further, in Figure 13 in addition to the condenser lens 20, the light source unit 10 and a light shielding member 30 described later are also shown.

[0143] As Figure 13 shown, the condenser lens 20 has an incident surface 20a and an exit surface 20b. The incident surface 20a and the exit surface 20b are, for example, planar. In addition, the incident surface 20a and the exit surface 20b may also be curved surfaces. The condenser lens 20 is disposed such that the incident surface 20a faces the light source 11 and the exit surface 20b faces the light shielding member 30.

[0144] The condenser lens 20 is a so-called meta-lens having a metasurface portion 21 on the incident surface 20a. The metasurface portion 21 can adopt a structure provided on at least one of the incident surface 20a and the exit surface 20b. The metasurface portion 21 transforms the incident wave surface from the light source 11 toward the slit 33 described later. The metasurface portion 21 is formed using, for example, GaN (gallium nitride), Si3N4 (silicon nitride), or the like. Due to the action of the metasurface portion 21 provided on the incident surface 20a, the wave surface of the light incident from the incident surface 20a is transformed toward the slit 33 described later and exits from the exit surface 20b. Therefore, the light exiting from the exit surface 20b is in a condensed state in the same manner as when exiting from the lens surface of a convex lens, that is, it converges toward the optical axis AX side in conformity with the shape of the slit 33 of the light shielding member 30 described later.

[0145] The metasurface portion 21 has a plurality of column portions 22. The column portions 22 are columnar and protrude from the incident surface 20a toward the light source 11 side. The plurality of column portions 22 are arranged in a matrix at a predetermined pitch, for example, in the left-right direction and the front-rear direction. The dimensions of the plurality of column portions 22 in a predetermined direction are each 2 times or less the wavelength of the light emitted from the light source 11. Thus, by setting the dimensions of the plurality of column portions 22 in a predetermined direction to 2 times or less the wavelength of the light from the light source 11, the stability of the phase becomes higher, it is easier to fabricate, and thus the cost can be reduced. In the present embodiment, for the predetermined direction, for example, any dimension in the front-rear direction or the left-right direction can be set.

[0146] The plurality of column portions 22 can be formed by techniques such as electron beam lithography and ion etching, for example. Further, in the condenser lens 20, the metasurface portion 21 and the portion other than the metasurface portion 21 can be made of materials having different dielectric constants and permeabilities.

[0147] In the condenser lens 20, the metasurface portion 21 is set in the range where the light emitted from the light source 11 at an emission angle of a predetermined angle α or less enters. That is, on the incident surface 20a of the condenser lens 20, a plurality of column portions 22 are formed in the range where the light emitted from the light source 11 at an emission angle of a predetermined angle α or less enters. In addition, the condenser lens 20 is formed with a plurality of column portions 22 in such a manner that the condensing angle of the light traveling toward the light shielding member 30 is, for example, a predetermined angle β or less in the horizontal direction with respect to the optical axis AX side.

[0148] In the present embodiment, the distance between the substrate 12 and the incident surface 20a of the condenser lens 20 is set as D1, the distance from the incident surface 20a to the light-shielding member 30 is set as D2, with respect to the slit 33 of the light-shielding member 30 described later, the distance from the optical axis AX to both ends in the left-right direction is set as D3, and with respect to the metasurface portion 21, the dimension from the optical axis AX to both ends in the left-right direction is set as D4. Here, when the distance D1 is 2.5 mm, the distance D2 is 13.5 mm, the distance D3 is 2 mm, and the distance D4 is 4.0 mm, the predetermined angle α can be set to, for example, 60°, and the predetermined angle β can be set to, for example, 15°. In addition, the values of the distances D1 to D4 and the values of the predetermined angles α and β are not limited to the above values.

[0149] Return Figures 10 to 12 , the light-shielding member 30 has a slit formation portion 31 and a protruding portion 532. In the light-shielding member 30, the slit formation portion 31 and the protruding portion 532 are formed as a single member in a flat plate shape. The entire light-shielding member 30 is formed using a material capable of blocking light. As such a material, for example, materials such as metals can be cited, but other materials can also be used. In addition, the light-shielding member 30 may also have a structure in which the slit formation portion 31 and the protruding portion 532 are formed of different members.

[0150] The slit formation portion 31 is, for example, circular in shape. The slit formation portion 31 has a slit 33. The slit 33 allows a part of the light condensed by the condenser lens 20 to pass through. The slit 33 is formed, for example, in a state where three are arranged in the up-down direction. The number and arrangement of the slits 33 are not limited to the above.

[0151] The protruding portion 532 protrudes linearly from the slit formation portion 31 in the left-right direction. The protruding portion 532 has a shape with rounded corners on both sides in the left-right direction. The front and rear surfaces of the protruding portion 532 are flat. The protruding portion 532 has openings 532a, 532b. The opening 532a is for inserting the protruding portion 553a of the support member 50 described later. The opening 532b is for inserting the threaded member 54 described later.

[0152] When viewed from the front, the light-shielding member 30 is formed so as to cover the condenser lens 20. With this structure, the light that has passed through the condenser lens 20 can be blocked by the light-shielding member 30.

[0153] The projection lens 40 has a lens portion 41, a cylindrical portion 42, and a protruding portion 43. The lens portion 41 projects the light that has passed through the slit 33 onto the road surface in front of the vehicle to form an illumination pattern. In the projection lens 40, the lens portion 41, the cylindrical portion 42, and the protruding portion 43 are formed as a single member.

[0154] In addition, the projection lens 40 may also be a structure in which at least one of the lens part 41, the cylindrical part 42, and the protruding part 43 is formed of different components. The lens part 41 is formed using a material that allows the light from the light source 11 to pass through. As such a material, for example, resin materials such as acrylic can be cited, but other materials can also be used. In this case, by integrally molding using the material constituting the lens part 41, the entire projection lens 40 can be easily formed. The projection lens 40 is a structure formed integrally using a material different from that of the condenser lens 20, but it can also be formed integrally using the same material as the condenser lens 20. In addition, in the projection lens 40, at least a part of the portion different from the lens part 41, that is, the cylindrical part 42 and the protruding part 43, can also be formed using a material different from that of the lens part 41.

[0155] The lens part 41 has an incident surface 41a and an exit surface 41b (see Figure 14 ). The incident surface 41a allows the light that has passed through the slit 33 to enter. The exit surface 41b emits the light that has entered from the incident surface 41a forward.

[0156] The cylindrical part 42 holds the lens part 41. The cylindrical part 42 is, for example, cylindrical. The cylindrical part 42 connects between the lens part 41 and the protruding part 43. The cylindrical part 42 is provided so as to protrude forward with respect to the protruding part 43. With this structure, the lens part 41 is disposed in front of the protruding part 43.

[0157] The protruding part 43 holds the lens part 41 via the cylindrical part 42. The protruding part 43 is flat. The protruding part 43 has openings 43a, 43b. The openings 43a, 43b are used for positioning with the fixing part 553 of the support member 50 described later.

[0158] The support member 50 has a base part 51, fins 52, and a fixing part 553. The base part 51 is flat. The base part 51 has a support surface 51a for supporting the light source unit 10. The support surface 51a is the front surface of the base part 51 and supports the substrate 12.

[0159] The fins 52 protrude rearward from the base part 51. A plurality of fins 52 are provided. The fins 52 release the heat generated in the light source 11.

[0160] The fixing part 553 protrudes forward from the support surface 51a of the base part 51. The fixing part 553 fixes the protruding part 532 and the protruding part 43. The fixing part 553 has a protruding part 553a and an opening 553b.

[0161] The protruding part 553a protrudes forward and penetrates through the opening 532a of the protruding part 532 and the opening 43a of the protruding part 43 in the front-rear direction.

[0162] Insert the threaded member 54 into the opening 553b. The threaded member 54 fixes the protruding portion 532 and the protruding portion 43 to the fixing portion 553. The threaded member 54 is inserted into the opening 553b of the fixing portion 553 through the opening 532b of the protruding portion 532 and the opening 43b of the protruding portion 43.

[0163] Figure 14 FIG. is an example showing the operation of the vehicle lamp 200 according to the second embodiment. According to the driver's operation of the direction indicator or the like, or in conjunction with the lighting of the hazard warning lamp or the like, the vehicle lamp 200 emits light from the light emitting surface 11a of the light source 11.

[0164] The light L emitted from the light emitting surface 11a enters the incident surface 20a of the condenser lens 20. Through the action of the metasurface portion 21 provided on the incident surface 20a, the incident wavefront is transformed into a curved wavefront in the converging direction. The light L after the wavefront transformation is emitted forward from the exit surface 20b in a state of converging toward the optical axis AX side.

[0165] The light L emitted forward from the exit surface 20b reaches the slit forming portion 31 of the light shielding member 30. A part of the light L reaching the slit forming portion 31 passes through the slit 33 of the light shielding member 30, and the remaining part is shielded by the light shielding member 30. The light L that has passed through the slit 33 enters the incident surface 41a of the lens portion 41 and is emitted from the exit surface 41b toward the front of the vehicle.

[0166] Figure 15 FIG. is an example showing the irradiation pattern formed on the road surface by the vehicle lamp 200. As Figure 15 shown, an irradiation pattern P is formed on the road surface in front of the vehicle by the light L emitted to the front of the vehicle.

[0167] The vehicle lamp 200 of the present embodiment has a structure in which the condenser lens 20 is flat and has a metasurface portion 21 on the incident surface 20a. Therefore, compared with the case of using a convex lens, it can be thinned, and the position of the exit surface 20b can be brought closer to the light source 11 side. Therefore, compared with the case of using a convex lens, the converging angle T can be reduced. In this case, the light L that has passed through the slit 33 does not reach the outer peripheral side of the incident surface 41a of the projection lens 40. Therefore, the irradiation pattern P can be formed without using the portion where the aberration in the projection lens 40 has a large influence. Therefore, the irradiation pattern P can be clearly formed.

[0168] Figures 16 to 19 FIG. is a view showing the structure of the fixing portion of the light source portion 10, the condenser lens 20, and the frame member 60 in the vehicle lamp 200 according to the second embodiment. Figure 16 is an exploded perspective view, Figure 17 is a view observed from the axial direction of the optical axis AX, Figure 18 is Figure 17The B - B cross-sectional view in Figure 19 is an enlarged view of Figure 18 a part (part C). As Figures 16 to 19 shown, the condenser lens 20 is fixed to the substrate 12 via the frame member 60.

[0169] The frame member 60 is arranged so as to surround the periphery of the light source 11. The frame member 60 is manufactured, for example, by performing stamping processing on materials such as metal plates. The frame member 60 can also be formed using materials different from metal materials.

[0170] The frame member 60 has a base portion 61, a wall portion 62, and a support portion 63. The base portion 61 is plate-shaped and fixed to the substrate 12. The base portion 61 is formed in a rectangular ring shape so as to surround the periphery of the light source 11. The base portion 61 is joined to the mounting surface 12a of the substrate 12 via the joining layer 64. The joining layer 64 is formed using a metal material such as solder, for example. In this way, the frame member 60 is fixed to the substrate 12 by metal joining. In addition, the joining of the frame member 60 and the substrate 12 can also use temporary fixing using an adhesive or the like in combination.

[0171] The joining layer 64 is provided in the substrate 12 in a state where a part of the periphery of the light source 11 is left vacant. In the present embodiment, the joining layer 64 is arranged on the left and right sides of the light source 11. In addition, the joining layer 64 is not arranged on the upper and lower sides of the light source 11. That is, the joining layer 64 is provided in a state where the upper and lower sides of the light source 11 in the substrate 12 are left vacant. In addition, in the portion of the substrate 12 where the joining layer 64 is not provided, wirings 13 connected to the light source 11 and the like are arranged (refer to Figure 15 , Figure 16 etc.).

[0172] The wall portion 62 projects forward in the axial direction of the optical axis AX from the base portion 61 in the light traveling direction. The wall portion 62 is formed in a rectangular shape so as to surround the periphery of the light source 11.

[0173] The support portion 63 is provided at the front end in the protruding direction of the wall portion 62. The support portion 63 is plate-shaped and arranged so as to cover the portion surrounded by the wall portion 62. The support portion 63 is arranged parallel or substantially parallel to the substrate 12. The support portion 63 has an opening 63a. The opening 63a allows the light emitted from the light source 11 to pass through. The opening 63a is, for example, circular, but is not limited to this structure and can also be other shapes.

[0174] Positioning portions 25, 65 are provided on the condenser lens 20 and the frame member 60 (refer to Figure 16etc.). The positioning portion 25 is provided at one of the four corners of the condenser lens 20. The positioning portion 25 has a structure in which the corner is cut off. Further, the positioning portion 65 is provided at one of the four corners of the base portion 61 of the frame member 60. The positioning portion 65 has a structure in which the corner is cut off. The positioning portions 25 and 65 are provided, for example, at corresponding corners. In the present embodiment, the positioning portions 25 and 65 are arranged at the lower right corner with respect to the optical axis AX.

[0175] By providing the positioning portions 25 and 65, when the condenser lens 20 is fixed to the frame member 60, it is possible to perform positioning while confirming whether the positioning portion 25 and the positioning portion 65 are arranged at positions corresponding to the optical axis AX. Therefore, the condenser lens 20 can be arranged at an appropriate position with respect to the frame member 60. Further, when the frame member 60 is fixed to the substrate 12, it is possible to perform positioning while confirming whether the positioning portion 65 is arranged at an appropriate position. Therefore, the frame member 60 can be arranged at an appropriate position with respect to the substrate 12.

[0176] The condenser lens 20 is joined to the frame member 60 via a joining layer 23, for example. When viewed from the axial direction of the optical axis AX, the joining layer 23 is arranged around the metasurface portion 21 in the incident surface 20a of the condenser lens 20. The joining layer 23 is formed of, for example, a low melting point glass. Further, the joining layer 23 is not limited to the low melting point glass and may be formed of other materials such as a metal material and an adhesive.

[0177] Figures 20 to 23 is a perspective view showing an example of the condenser lens 20. In Figures 20 to 23 shows a state in which the condenser lens 20 is obliquely viewed from the incident surface 20a side. Figure 20 The condenser lens 20 shown (hereinafter referred to as the condenser lens 20A) is, for example, rectangular in shape. The condenser lens 20A has a metasurface portion 21 formed in a circular range of the incident surface 20a. In the condenser lens 20A, the above-described positioning portion 25 is formed at one corner.

[0178] Figure 21The condenser lens 20 shown (hereinafter referred to as condenser lens 20B) is the same as the condenser lens 20A. For example, it has a rectangular shape. A metasurface portion 21 is formed in a circular range of the incident surface 20a, and the above-mentioned positioning portion 25 is formed at one corner. In the condenser lens 20B, a bonding layer 23B is provided on the incident surface 20a. The bonding layer 23B is provided so as to surround the periphery of the metasurface portion 21 on the incident surface 20a. The bonding layer 23B is provided with a distance left between it and the outer peripheral portion of the metasurface portion 21. In the condenser lens 20B, the bonding layer 23B is provided on substantially the entire surface around the metasurface portion 21. The bonding layer 23B is formed into a thin film shape using a metal material such as metal evaporation, for example. In addition, the bonding layer 23B can be soldered as a base layer. The bonding layer 23B is used as a stray light suppression portion 24B, and this stray light suppression portion 24B shields the light incident on a portion of the condenser lens 20B different from the metasurface portion 21.

[0179] Figure 22 The condenser lens 20 shown (hereinafter referred to as condenser lens 20C) is the same as the condenser lenses 20A and 20B. For example, it has a rectangular shape. A metasurface portion 21 is formed in a circular range of the incident surface 20a, and the above-mentioned positioning portion 25 is formed at one corner. In the condenser lens 20C, a bonding layer 23C is provided on the incident surface 20a. The bonding layer 23C is formed into a strip shape along the two sides in the left-right direction of the metasurface portion 21 on the incident surface 20a. The bonding layer 23C is formed into a thin film shape using a metal material such as solder, for example. The bonding layer 23C is used as a stray light suppression portion 24C, and this stray light suppression portion 24C shields the light incident on a portion of the condenser lens 20C different from the metasurface portion 21.

[0180] Figure 23 The condenser lens 20 shown (hereinafter referred to as condenser lens 20D) is the same as the condenser lenses 20A, 20B, and 20C. For example, it has a rectangular shape. A metasurface portion 21 is formed in a circular range of the incident surface 20a, and the above-mentioned positioning portion 25 is formed at one corner. In the condenser lens 20D, a bonding layer 23D and a coating layer 26D are provided on the incident surface 20a. The bonding layer 23D is formed into a strip shape along the two sides in the left-right direction of the metasurface portion 21 on the incident surface 20a. The bonding layer 23D is formed into a thin film shape using a metal material such as solder, for example. The coating layer 26D is provided so as to cover the entire surface or substantially the entire surface around the metasurface portion 21 on the incident surface 20a, for example. The coating layer 26D is formed into a thin film shape using a coating material, for example. In addition, the coating layer 26D can also be formed on the incident surface 20a in a portion other than the portion where the bonding layer 23D is provided around the metasurface portion 21. The bonding layer 23D and the coating layer 26D are used as a stray light suppression portion 24D, and this stray light suppression portion 24D shields the light incident on a portion of the condenser lens 20D different from the metasurface portion 21.

[0181] Figures 24 to 27 These are views showing other examples of the vehicle lamp according to the second embodiment. Specifically, Figures 24 to 27 This is a view showing the structure of the fixed portions of the light source unit 10, the condenser lens 20, and the frame member 60 in the vehicle lamp 300 of another example. Figure 24 This is an exploded perspective view, Figure 25 This is a view observed from the axial direction of the optical axis AX, Figure 26 This is Figure 25 a cross-sectional view taken along D - D in Figure 27 This is a view showing an enlarged part (part E) of Figure 26 . As shown in Figures 24 to 27 , in the vehicle lamp 300, the condenser lens 20 is joined to the frame member 60 via the cover member 70. In addition, regarding other structures of the vehicle lamp 300, they are the same as those of the above-described vehicle lamp 200, and thus the description is omitted or simplified.

[0182] The cover member 70 is provided on the incident surface 20a side with respect to the condenser lens 20 and is arranged so as to cover the metasurface portion 21. The cover member 70 is, for example, a rectangular plate. When observed from the axial direction of the optical axis AX, the cover member 70 is formed, for example, to have the same or substantially the same size as the condenser lens 20.

[0183] The cover member 70 allows the light from the light source 11 to pass through on the metasurface portion 21 side. The cover member 70 can be formed of the same material as the metasurface portion 21 in the condenser lens 20 or can be formed of the same material as the portions other than the metasurface portion 21 in the condenser lens 20. When observed from the axial direction of the optical axis AX, the cover member 70 is formed to have a size that overlaps with the frame member 60. A portion corresponding to the positioning portion 25 of the condenser lens 20 is provided in the cover member 70, that is, a positioning portion 76 is provided at the lower right corner with respect to the optical axis AX.

[0184] In the present embodiment, the cover member 70 is joined to the frame member 60 via the bonding layer 73. When observed from the axial direction of the optical axis AX, the bonding layer 73 is arranged in a region corresponding to the periphery of the metasurface portion 21 in the incident surface 20a of the condenser lens 20. In the present embodiment, the bonding layer 73 is formed in a ring shape along the outer periphery of the cover member 70. The bonding layer 73 is formed, for example, of a low melting point glass. In addition, the bonding layer 73 is not limited to the low melting point glass and can also be formed of other materials such as a metal material or an adhesive.

[0185] The cover member 70 is disposed at a distance from the metasurface portion 21 in the axial direction of the optical axis AX. A spacer 71 is disposed between the metasurface portion 21 and the cover member 70. The spacer 71 is, for example, in the shape of a rectangular plate. The spacer 71 has an opening 71a within the range of the metasurface portion 21 when viewed from the axial direction of the optical axis AX. When viewed from the axial direction of the optical axis AX, the spacer 71 is formed such that the dimensions of the outer contour are the same as or substantially the same as those of the condenser lens 20 and the cover member 70. In addition, regarding the dimensions of the spacer 71, they may also be the same as or substantially the same as those of the condenser lens 20 and the cover member 70. The spacer 71 can be formed using, for example, the same material as the condenser lens 20 or the cover member 70. In the spacer 71, positioning portions 77 are provided at portions corresponding to the positioning portion 25 of the condenser lens 20 and the positioning portion 76 of the cover member 70, that is, the lower right corner portion of the optical axis AX.

[0186] In addition, the spacer 71 can also be formed using a material such as a metal material that blocks light from the light source 11. In this case, the spacer 71 functions as a stray light suppression portion 24 that blocks light incident on portions other than the metasurface portion 21. In addition, the stray light suppression portion 24 can also be formed by forming a thin film such as a metal film or a coating film on the surface of the spacer 71.

[0187] The spacer 71 is joined to the cover member 70 via a joining layer 74. In addition, the spacer 71 is joined to the condenser lens 20 via a joining layer 75. When viewed from the axial direction of the optical axis AX, the joining layers 74 and 75 are disposed in a region overlapping with the joining layer 73, that is, a region corresponding to the periphery of the metasurface portion 21 in the incident surface 20a of the condenser lens 20. In the present embodiment, the joining layers 74 and 75 are formed in a ring shape along the outer peripheries of the cover member 70, the spacer 71, and the condenser lens 20. The joining layers 74 and 75 are formed using, for example, a low-melting-point glass. In addition, the joining layers 74 and 75 are not limited to the low-melting-point glass and may be formed of other materials such as a metal material or an adhesive.

[0188] In the present embodiment, the condenser lens 20, the cover member 70, and the spacer 71 are disposed in a stacked state overlapping in the axial direction of the optical axis AX. In this structure, the cover member 70 supports the incident surface 20a of the condenser lens 20 via the spacer 71.

[0189] In the vehicle lamp 300, similar to the vehicle lamp 200, the frame member 60 is disposed so as to surround the periphery of the light source 11. In addition, the joining layer 64 that joins the frame member 60 to the substrate 12 is provided in the substrate 12 in a state where a part of the periphery of the light source 11 is left vacant. In the portion of the substrate 12 where the joining layer 64 is not provided, wiring 13 and the like (refer to Figure 25 etc.) connected to the light source 11 are disposed.

[0190] In addition, in the present embodiment, the spacer 71 may not be provided. In this case, the following structure may also be adopted: a part of the cover member 70 protrudes toward the incident surface 20a side of the condenser lens 20, and the condenser lens 20 is supported in a state where the protruding part is in contact with the incident surface 20a.

[0191] Figure 28 And Figure 29 FIGS. are diagrams showing other examples of the vehicle lamp according to the second embodiment. Specifically, Figure 28 And Figure 29 FIGS. are diagrams showing the structures of the fixed parts of the light source unit 10, the condenser lens 20, and the frame member 160 in the vehicle lamp 400 of other examples. Figure 28 is a perspective view, Figure 29 is an exploded perspective view.

[0192] In Figure 28 And Figure 29 In the vehicle lamp 400 shown in FIGS., the frame member 160 is formed of ceramic. The frame member 160 has a base portion 161 and a wall portion 162. The base portion 161 is plate-shaped and is fixed to the substrate 12. The base portion 161 is formed in a rectangular ring shape so as to surround the periphery of the light source 11. The base portion 161 has an opening 161a. The light emitted from the light source 11 passes through the opening 161a. The opening 161a is, for example, rectangular, but is not limited to this structure, and may be other shapes such as circular. The base portion 161 is joined to the substrate 12 via a joining layer 164. The joining layer 164 is formed of a metal material such as solder, for example. In addition, the joining of the frame member 160 to the substrate 12 may also use temporary fixing using an adhesive or the like in combination.

[0193] The joining layer 164 is provided on the substrate 12 in a state where a part of the periphery of the light source 11 is left vacant. In the present embodiment, the joining layer 164 is disposed on the left and right sides of the light source 11. In addition, the joining layer 164 is not disposed on the upper and lower sides of the light source 11. That is, the joining layer 164 is provided on the substrate 12 in a state where the upper and lower sides of the light source 11 are left vacant. In addition, wiring 13 or the like (see Figure 29 etc.) connected to the light source 11 is disposed in the portion of the substrate 12 where the joining layer 164 is not provided.

[0194] The wall portion 162 protrudes forward from the base portion 161 in the axial direction of the optical axis AX toward the traveling direction of light. The wall portion 162 is formed in a rectangular shape so as to surround the periphery of the light source 11. A planar support portion 163 is formed at the end portion of the wall portion 162 in the protruding direction. The support portion 163 is formed parallel or substantially parallel to the substrate 12. The support portion 163 supports the condenser lens 20. In the wall portion 162, a positioning portion 165 is provided at a portion corresponding to the positioning portion 25 of the condenser lens 20, that is, at the lower right corner portion of the optical axis AX.

[0195] By providing the frame member 160 made of ceramic, it is possible to suppress the installation area of the frame member 160 in the substrate 12. In addition, compared with a frame member made of metal, the frame member 160 has a smaller coefficient of linear expansion, and the difference in the coefficient of linear expansion from that of the condenser lens 20 becomes smaller. Therefore, the reliability of the bonding between the frame member 160 and the condenser lens 20 is improved. In addition, compared with a frame member made of metal, the frame member 160 has improved electrical insulation, and thus does not electrically interfere with conductor patterns such as wirings formed on the substrate 12. Therefore, the degree of freedom in designing the conductor pattern on the substrate 12 is improved. And, compared with a frame member made of metal, the frame member 160 has improved heat dissipation efficiency, and thus the heat dissipation performance of the substrate 12 can be improved.

[0196] Figure 30 And Figure 31 is a view showing another example of the vehicle lamp according to the second embodiment. Specifically, Figure 30 And Figure 31 is a view showing the structure of the fixed portions of the light source portion 10, the condenser lens 20, and the frame member 260 in another example of the vehicle lamp 500. Figure 30 is a perspective view, Figure 31 is an exploded perspective view.

[0197] As Figure 30 And Figure 31 shown, the frame member 260 has a base portion 261, a wall portion 262, and a support portion 263. Regarding the base portion 261 and the support portion 263, they have the same structure as the base portion 61 and the support portion 63 of the above-mentioned frame member 60. In addition, in the present embodiment, the wall portion 262 has a structure having a ventilation portion 262a in addition to the structure of the above-mentioned wall portion 62. The ventilation portion 262a communicates the inner peripheral side and the outer peripheral side of the frame member 260. By providing the ventilation portion 262a, the heat generated by the light source 11 can be efficiently released to the outside of the frame member 260 by convection.

[0198] Figure 32 is a perspective view showing the structure of a modified example of the condenser lens 20E. As Figure 32 shown, the condenser lens 20E is the same as the above-mentioned condenser lens 20B (refer toFigure 21 ) They are the same, for example, in a rectangular shape. A metasurface portion 21 is formed within the circular range of the incident surface 20a, and a bonding layer 23E is provided on the incident surface 20a. The bonding layer 23E is the same as the bonding layer 23B of the condenser lens 20B, and is formed in a thin film shape using a metal material such as metal evaporation on substantially the entire surface around the metasurface portion 21 on the incident surface 20a. The bonding layer 23E is used as a stray light suppression portion 24E, and the stray light suppression portion 24E shields the light incident on a portion of the condenser lens 20B different from the metasurface portion 21. In addition, different from the bonding layer 23B of the condenser lens 20B, an opening portion 25E is provided at a position corresponding to one corner portion. The opening portion 25E can be used as a positioning portion for positioning the condenser lens 20E.

[0199] Figure 33 It is a perspective view showing the structure of the frame member 60F which is a modified example. As Figure 33 shown, the frame member 60F is the same as the above-mentioned frame member 60, and has a base portion 61F, a wall portion 62F, and a support portion 63F. Regarding the wall portion 62F and the support portion 63F, they are the same as the wall portion 62 and the support portion 63 of the frame member 60. The base portion 61F has a structure in which an opening portion 65F is provided in addition to the structure of the base portion 61 of the frame member 60. The opening portion 65F is provided at a position corresponding to one corner portion of the base portion 61F. The opening portion 65F can be used as a positioning portion for positioning the frame member 60F.

[0200] As described above, the vehicle lamp 200 of the present embodiment includes: a light source 11 that emits light; a condenser lens 20 that condenses the light emitted from the light source 11; and a projection lens 40 that irradiates the light condensed by the condenser lens 20 to form an irradiation pattern P. The condenser lens 20 is in a flat plate shape having an incident surface 20a for the light from the light source 11 to enter and an exit surface 20b for emitting the light incident from the incident surface 20a. The incident surface 20a has a metasurface portion 21 that transforms the wavefront of the light from the light source 11 into a converging direction, and also includes a stray light suppression portion 24 that shields the light incident on a portion of the condenser lens 20 different from the metasurface portion 21.

[0201] According to this structure, the condenser lens 20 is plate-shaped with an incident surface 20a and an exit surface 20b. The metasurface portion 21 that transforms the wavefront of the light from the light source 11 into a converging wavefront in the converging direction is provided on the incident surface 20a. Therefore, compared with the case of using a convex lens, the thickness can be made thinner. As a result, a structure can be formed in which the position of the exit surface 20b is arranged on the light source 11 side, and the converging angle T toward the light shielding member 30 can be reduced. Therefore, the irradiation pattern P can be formed without using a portion where the aberration in the projection lens 40 has a large influence, and thus the degradation of the appearance of the irradiation pattern P can be suppressed. In addition, the stray light suppression portion 24 can shield the light incident on a portion of the condenser lens 20 different from the metasurface portion 21, and thus the light emitted from the condenser lens 20 can be suppressed from becoming stray light.

[0202] In the vehicle lamp 200 of the present embodiment, the stray light suppression portion 24 is provided on the condenser lens 20. According to this structure, the light incident on a portion of the condenser lens 20 different from the metasurface portion 21 can be more reliably shielded.

[0203] In the vehicle lamp 200 of the present embodiment, the stray light suppression portion 24 is provided around the metasurface portion 21 on the incident surface 20a of the condenser lens 20. According to this structure, the light incident on a portion of the condenser lens 20 different from the metasurface portion 21 can be more reliably shielded.

[0204] In the vehicle lamp 200 of the present embodiment, it further includes: a substrate 12 on which the light source 11 is mounted; and a frame member 60 that is fixed to the substrate 12 and supports the condenser lens 20. The condenser lens 20 is joined to the frame member 60 via a joining layer 23, and the stray light suppression portion 24 includes at least a part of the joining layer 23. According to this structure, at least a part of the joining layer 23 can be used as the stray light suppression portion 24, and thus it can be manufactured effectively.

[0205] In the vehicle lamp 300 of the present embodiment, it further includes: a cover member 70 that supports the incident surface 20a of the condenser lens 20, covers the metasurface portion 21, and allows the light from the light source 11 to pass through the metasurface portion 21 side; and a spacer 71 that is disposed between the cover member 70 and the incident surface 20a. The stray light suppression portion 24 is provided on the spacer 71. According to this structure, the light incident on a portion of the condenser lens 20 different from the metasurface portion 21 can be more reliably suppressed.

[0206] In the vehicle lamps 200, 300, 400, 500 of the present embodiment, a light shielding member 30 is further provided. The light shielding member 30 has a slit 33 that allows a part of the light condensed by the condenser lenses 20 to 20E to pass through. The projection lens 40 irradiates the light that has passed through the slit 33 onto the road surface to form an irradiation pattern P. The stray light suppression unit 24 is provided between the light source 11 and the light shielding member 30. According to this structure, it is possible to suppress a decrease in the appearance of the irradiation pattern P formed on the road surface. In addition, it is possible to more reliably suppress the light emitted from the condenser lens 20 from becoming stray light between the light source 11 and the light shielding member 30.

[0207] The technical scope of the present disclosure is not limited to the above embodiment, and can be appropriately changed without departing from the gist of the present disclosure. For example, in the above embodiment, the structure in which the vehicle lamp 200 is arranged at the front of the vehicle M is taken as an example for description, but it is not limited thereto. The vehicle lamp 200 may also be a structure arranged at the rear or side of the vehicle M, and is a structure for forming an irradiation pattern on the road surface behind or beside the vehicle M. In addition, in the vehicle lamps 200, 300, 400, 500 of the present embodiment, the structure for forming the irradiation pattern P on the road surface is taken as an example for description, but it is not limited thereto. For example, even if it is a structure for forming an irradiation pattern at a place other than the road surface in front of or behind the vehicle M, the technology of the present disclosure can be applied.

[0208] <Third Embodiment>

[0209] Hereinafter, a third embodiment of the vehicle lamp of the present disclosure will be described based on the drawings. In addition, the present invention is not limited to this embodiment. In addition, the constituent elements in the following embodiments include constituent elements that can be replaced by those skilled in the art and are easily replaceable, or substantially the same constituent elements.

[0210] Figure 34 and Figure 35 is an exploded perspective view showing an example of the vehicle lamp 600 of the third embodiment. Figure 34 shows a state of obliquely observing from the front side, Figure 35 shows a state of obliquely observing from the back side. Figures 36 to 38 is a view showing an example of a state in which the vehicle lamp 600 of the third embodiment is assembled. Figure 36 shows a state of observing from the front side, Figure 37 shows a state of observing from the left side, Figure 38 shows a state of observing from the lower side. As Figures 34 to 38 shown, the vehicle lamp 600 includes a light source unit 610, a light source side lens 620, a projection lens 630, and a frame member 640.

[0211] The light source unit 610 includes a light source 611 and a substrate (light source substrate) 612. The light source 611 is, for example, a semiconductor-type light source such as an LED. The light source 611 has a light-emitting surface 611a that emits light. The light-emitting surface 611a is disposed opposite to the incident surface 620a of the light source-side lens 620. The light source 611 emits light of a single color, for example, orange (amber) light, from the light-emitting surface 611a. For example, one light source 611 is provided. In addition, a plurality of light sources 611 may also be provided. Further, the color of the light emitted from the light-emitting surface 611a is not limited to orange.

[0212] The substrate 612 has a mounting surface 612a. The light source 611 is mounted on the mounting surface 612a. The substrate 612 has a connector surface 612b on the side opposite to the mounting surface 612a. A connector 614 is connected to the connector surface 612b. The substrate 612 is formed with wirings, circuits, etc. for supplying power to the light source 611. A through hole that penetrates the mounting surface 612a and the connector surface 612b is provided in the substrate 612. Via this through hole, the mounting surface 612a and the connector surface 612b are electrically connected.

[0213] The light source-side lens 620 emits the light from the light source 611 toward the projection lens 630 side. The light source-side lens 620 is formed of a light-transmissive material such as quartz glass, for example, in a plate shape such as a flat plate shape. The light source-side lens 620 can have a thickness (dimension in the front-rear direction) set to, for example, 0.3 mm or more and 1.5 mm or less.

[0214] Figures 39 to 41 It is a diagram showing an example of the light source-side lens 620 of the third embodiment. Figure 39 It is a diagram viewed from the front side (the projection lens 630 side), Figure 40 It is a diagram viewed from the back side (the light source unit 610 side), Figure 41 It shows along Figure 39 The structure of the cross section taken along A - A in. As Figures 39 to 41 shown, the light source-side lens 620 has an incident surface 620a and an exit surface 620b. The incident surface 620a and the exit surface 620b are, for example, planar. In addition, the incident surface 620a and the exit surface 620b may also be curved surfaces. The light source-side lens 620 is arranged such that the incident surface 620a faces the light source 611 side and the exit surface 620b faces the projection lens 630 side.

[0215] The light source side lens 620 is a so-called metalens having a metasurface portion 621 on the incident surface 620a. The metasurface portion 621 transforms the incident wavefront from the light source 611 toward the slit 624 described later. The metasurface portion 621 is formed using, for example, GaN (gallium nitride), Si3N4 (silicon nitride), or the like. By the action of the metasurface portion 621 provided on the incident surface 620a, the wavefront of the light incident from the incident surface 620a is transformed toward the exit surface 620b, and the light after the wavefront transformation reaches the exit surface 620b. The light that reaches the light shielding portion 623 described later in the exit surface 620b is shielded by the light shielding portion 623, and the light that reaches the slit 624 passes through the slit 624 and is emitted from the exit surface 620b. The light emitted from the exit surface 620b is the same as the case of being emitted from the lens surface of the convex lens in the horizontal direction, and becomes a state of being condensed in a manner of converging toward the optical axis AX side, and in the vertical direction, from the upper part to the lower part of the exit surface 620b, the light becomes a state of diffusing from the horizontal direction toward the lower side.

[0216] The metasurface portion 621 has a plurality of columnar portions 622 (see Figure 42 ). The columnar portions 622 are columnar and protrude from the incident surface 620a toward the light source 611 side. The plurality of columnar portions 622 are arranged in a matrix at a predetermined pitch, for example, in the left-right direction and the front-back direction. In addition, the plurality of columnar portions 622 may be configured in a circular shape or a concentric circular shape. For example, any dimension in the front-back direction or the left-right direction of the plurality of columnar portions 622 is 2 times or less the wavelength of the light emitted from the light source 611. In this way, by setting any dimension in the front-back direction or the left-right direction of the plurality of columnar portions 622 to 2 times or less the wavelength of the light from the light source 611, the stability of the phase becomes higher, it is easier to fabricate, and thus the cost can be reduced.

[0217] The plurality of columnar portions 622 can be formed by techniques such as electron beam lithography, nanoimprinting, and ion etching. In addition, in the light source side lens 620, the metasurface portion 621 and the portion other than the metasurface portion 621 can be made of materials having different dielectric constants and permeabilities.

[0218] When viewed from the light source 611 side, the metasurface portion 621 is formed in a circular shape, for example (see Figure 40 etc.). The metasurface portion 621 sets the phase distribution in such a manner that the phase periodically changes concentrically in the radial direction from a circular region including the optical axis AX of the light source side lens 620 (see Figure 40the dashed-line portion). In addition, the center of the concentric circles and the optical axis AX may be offset in the vertical direction or the like, for example. In each period of the phase distribution, the diameter of the column portion 622 can be set to gradually decrease as the phase becomes smaller. The metasurface portion 621 is set such that the diameter of the light-emitting range in the light-emitting surface 611a of the light source 611 and the diameter of the metasurface portion 621 are, for example, 1:4. For example, when the light-emitting surface 611a has dimensions of 1 mm in length and 1 mm in width, the diameter of the light-emitting range becomes 1 mm. In this case, the diameter of the metasurface portion 621 can be set to about 4 mm. In Figure 40 FIG. Figure 40 shows an example of the position, size, and range of the slit 624 when viewed from the axial direction of the optical axis AX with a one-dot chain line. In Figure 40 In the example shown in FIG. Figure 40 , the size of the metasurface portion 621 in the short-side direction (horizontal direction) of the slit 624 described later is larger than that of the slit 624. In addition, the size of the metasurface portion 621 in the long-side direction (vertical direction) of the slit 624 is smaller than that of the slit 624. In other words, when viewed from the axial direction of the optical axis AX, the metasurface portion 621 is formed in the range extending from the slit 624 in the horizontal direction and in the range inside the slit 624 in the vertical direction.

[0219] The light source-side lens 620 has a light-shielding portion 623 on the light-emitting surface 620b. The light-shielding portion 623 is formed in a thin-film shape using a metal material or the like, for example. The light-shielding portion 623 can be formed by various methods such as printing, lamination, and evaporation. The light-shielding portion 623 has a first opening 623a and a second opening 623b. In the light source-side lens 620, the light-emitting surface 620b is in a state covered by the light-shielding portion 623. In addition, in the light source-side lens 620, the light-emitting surface 620b is in an exposed state at the portions where the first opening 623a and the second opening 623b are formed.

[0220] The first opening 623a constitutes the slit 624. The slit 624 allows a part of the light whose wavefront has been transformed in the metasurface portion 621 to pass through. The slit 624 is formed, for example, in a state extending in the vertical direction. In addition, the number and arrangement of the slits 624 are not limited to the above. For example, the slits 624 may be formed in a state arranged in three in the vertical direction as shown by the one-dot chain line in Figure 39 FIG. Figure 39 . Thus, in the present embodiment, the light-shielding portion 623 having the slit 624 is provided in the light source-side lens 620. In other words, the light source-side lens 620 has a light-shielding function that allows a part of the light whose wavefront has been transformed to pass through. Therefore, a light-shielding member may be provided separately.

[0221] The second opening 623b forms the positioning portion 625. The positioning portion 625 is provided at at least one of the four corners of the light source side lens 620. In the present embodiment, a structure is adopted in which one positioning portion 625 is provided at each of the opposed corners, and a total of two positioning portions 625 are provided. In addition, the number, size, and arrangement of the positioning portions 625 are not limited to the above. By providing the positioning portion 625, when the light source side lens 620 is fixed to the frame member 640, it is possible to perform positioning while confirming whether the positioning portion 625 is arranged at a position corresponding to the optical axis AX by image recognition or the like. Therefore, the light source side lens 620 can be arranged at an appropriate position with respect to the frame member 640.

[0222] Return Figures 34 to 38 , the projection lens 630 has a lens portion 631 and legs 632. The lens portion 631 projects the light that has passed through the slit 624 onto the road surface in front of the vehicle to form an illumination pattern. In the projection lens 630, the lens portion 631 and the legs 632 are formed as one component. The projection lens 630 may also have a structure in which the lens portion 631 and the legs 632 are formed of different components. The lens portion 631 is formed of a material that allows the light from the light source 611 to pass through. As such a material, for example, resin materials such as acrylic can be cited, but other materials can also be used.

[0223] The lens portion 631 has an incident surface 631a and an exit surface 631b (refer to Figure 38 ). The incident surface 631a allows the light that has passed through the slit 624 to enter. The exit surface 631b emits the light that has entered from the incident surface 631a forward. The legs 632 are provided on both sides of the lens portion 631 in the left-right direction. The legs 632 are fixed to the substrate 612.

[0224] The frame member 640 has a base portion 641 and a wall portion 642. The base portion 641 is plate-shaped and is fixed to the substrate 612. The base portion 641 is formed in a rectangular ring shape so as to surround the periphery of the light source 611. The base portion 641 has an opening 641a. The opening 641a allows the light emitted from the light source 611 to pass through. The opening 641a is, for example, rectangular, but is not limited to this structure, and may be other shapes such as circular. The base portion 641 is joined to the substrate 612 via a joining layer 644. The joining layer 644 is formed of a metal material such as solder, for example. In addition, the joining of the frame member 640 and the substrate 612 may also use temporary fixing using an adhesive or the like in combination.

[0225] The bonding layer 644 is provided in the substrate 612 in a state where a part around the light source 611 is left vacant. In the present embodiment, the bonding layer 644 is disposed on the left and right sides of the light source 611. In addition, the bonding layer 644 is not disposed on the upper and lower sides of the light source 611. That is, the bonding layer 644 is provided in a state where the upper and lower sides of the light source 611 in the substrate 612 are left vacant. In addition, wirings or the like connected to the light source 611 may be disposed in the portions of the substrate 612 where the bonding layer 644 is not provided.

[0226] The wall portion 642 projects forward in the axial direction of the optical axis AX from the base portion 641 toward the traveling direction of light. The wall portion 642 is formed in a rectangular shape so as to surround the periphery of the light source 611. A planar support portion 643 is formed at the end portion in the protruding direction of the wall portion 642. The support portion 643 is formed parallel or substantially parallel to the substrate 612. The support portion 643 supports the light source side lens 620. The wall portion 642 is a structure having a ventilation portion 641c (refer to Figure 35 and Figure 38 ). The ventilation portion 641c communicates the inner peripheral side and the outer peripheral side of the frame member 640. By providing the ventilation portion 641c, heat generated by the light source 611 can be efficiently released to the outside of the frame member 640 by convection. In addition, the ventilation portion 641c can be configured to open the space of the wiring formed on the mounting surface 612a of the substrate 612 in a state where the frame member 640 is fixed to the substrate 612. In this case, interference between the wiring formed on the mounting surface 612a and the frame member 640 can be avoided.

[0227] The frame member 640 is formed of, for example, ceramic. In addition, the frame member 640 may be formed of metal. In the present embodiment, by providing the frame member 640 made of ceramic, the installation area of the frame member 640 in the substrate 612 can be suppressed. In addition, compared with a frame member made of metal, the frame member 640 has a smaller coefficient of linear expansion, and the difference in the coefficient of linear expansion from that of the light source side lens 620 becomes smaller. Therefore, the reliability of the bonding between the frame member 640 and the light source side lens 620 is improved. In addition, compared with a frame member made of metal, the frame member 640 has improved electrical insulation, and thus does not electrically interfere with conductor patterns such as wirings formed on the substrate 612. Therefore, the degree of freedom in designing the conductor patterns on the substrate 612 is improved. And, compared with a frame member made of metal, the frame member 640 has improved heat dissipation efficiency, and thus the heat dissipation property of the substrate 612 can be improved.

[0228] Figure 42 and Figure 43FIG. 0 is a diagram showing an example of the operation of a vehicle lamp 600 according to the third embodiment. According to the driver's operation of a direction indicator or the like, or in conjunction with the lighting of a hazard warning lamp or the like, the vehicle lamp 600 emits light from the light emitting surface 611a of the light source 611.

[0229] The light L emitted from the light emitting surface 611a enters the incident surface 620a of the light source side lens 620, and due to the action of the metasurface portion 621 provided on the incident surface 620a, the wavefront of the light L is transformed toward the exit surface 620b. As Figure 42 shown, the light L after wavefront transformation reaches the exit surface 620b in a state of converging toward the optical axis AX side in the horizontal direction. In addition, as Figure 43 shown, the light L after wavefront change reaches the exit surface 620b in such a manner that the light diffuses downward in the vertical direction and the diffusion of the light upward is suppressed. In the present embodiment, the light L reaches the uppermost part in the vertical direction of the exit surface 620b in a state parallel or substantially parallel to the optical axis AX. As Figure 42 and Figure 43 shown, a part of the light L that reaches the exit surface 620b passes through the slit 624 of the light shielding portion 623, and the remaining part is shielded by the light shielding portion 623. The light L that has passed through the slit 624 enters the incident surface 631a of the lens portion 631 of the projection lens 630 and is emitted from the exit surface 631b toward the front of the vehicle.

[0230] Figure 44 FIG. 15 is a diagram showing an example of the irradiation pattern formed on the road surface by the vehicle lamp 600. As Figure 44 shown, an irradiation pattern P is formed on the road surface in front of the vehicle by the light L emitted to the front of the vehicle. When the slit 624 is shaped such that a plurality of slits are arranged in the vertical direction, the irradiation pattern P is also formed in a state where a plurality of patterns are arranged in the front-rear direction (refer to the single-dot chain line in Figure 44 ).

[0231] In the vehicle lamp 600 of the present embodiment, the light source side lens 620 has a flat plate shape and has a metasurface portion 621 on the incident surface 620a. Therefore, compared with the case of using a convex lens, it can be made thinner. Therefore, compared with the case of using a convex lens, the condensing angle can be reduced. In this case, the light L that has passed through the slit 624 does not reach the outer peripheral side of the incident surface 631a of the projection lens 630. Therefore, the irradiation pattern P can be formed without using the portion where the aberration in the projection lens 630 has a large influence. Therefore, the irradiation pattern P can be clearly formed.

[0232] As described above, the vehicle lamp 600 according to the present embodiment includes: a light source 611 that emits light; a light source-side lens 620 that has an incident surface 620a into which light from the light source 611 is incident, a metasurface portion 621 provided on the incident surface 620a and transforming the wavefront of the light, an exit surface 620b that emits the light with the wavefront transformed, and a light-shielding portion 623 provided on the exit surface 620b and having a slit 624 that allows a part of the light to pass through; and a projection lens 630 that irradiates the light that has passed through the slit 624 in the light source-side lens 620 to form an illumination pattern P.

[0233] According to this structure, since the light-shielding portion 623 having the slit 624 is provided integrally with the light source-side lens 620, it is not necessary to separately provide a light-shielding member. Therefore, the number of components of the vehicle lamp 600 can be reduced. In addition, when assembling the vehicle lamp 600, it is not necessary to align the light source-side lens 620 and the light-shielding member. Thus, the burden during the assembly of the vehicle lamp 600 can be reduced.

[0234] In the vehicle lamp 600 according to the present embodiment, the light-shielding portion 623 is formed in a thin film shape using a metal material. According to this structure, by forming it in a thin film shape using a metal material, the light-shielding portion 623 can be easily formed on the light source-side lens 620.

[0235] In the vehicle lamp 600 according to the present embodiment, the light-shielding portion 623 has a first opening portion 623a that constitutes the slit 624. According to this structure, when forming the light-shielding portion 623 on the light source-side lens 620, the slit 624 can be easily formed by forming the first opening portion 623a using lithography or the like.

[0236] The vehicle lamp 600 according to the present embodiment further includes: a substrate 612 on which the light source 611 is mounted; and a frame member 640 that is fixed to the substrate 612, the light source-side lens 620 being supported by the frame member 640, and a positioning portion 625 being provided on at least one of the light source-side lens 620 and the frame member 640. According to this structure, since the light source-side lens 620 is supported by the substrate 612 via the frame member 640, the light source-side lens 620 can be stably supported. And when the size of the light source-side lens 620 or the relative position between the light source-side lens 620 and the light source 611 changes, it is only necessary to change the frame member 640, so it is possible to easily cope with multiple varieties. In addition, by providing the positioning portion 625, the position accuracy of at least one of the light source-side lens 620 and the frame member 640 can be improved during assembly.

[0237] In the vehicle lamp 600 of the present embodiment, the light shielding portion 623 has a second opening portion 623b corresponding to the positioning portion 625. According to this structure, when forming the light shielding portion 623 on the light source side lens 620, the second opening portion 623b can be easily formed by using lithography or the like, thereby enabling the positioning portion 625 to be easily formed.

[0238] In the vehicle lamp 600 of the present embodiment, the substrate 612 has a mounting surface 612a on which the light source 611 is mounted. The frame member 640 is fixed to the mounting surface 612a, and a connector 614 is further provided. The connector 614 is provided on the connector surface 612b of the substrate 612 opposite to the mounting surface 612a and is connected to the outside. According to this structure, by providing the connector 614 on the connector surface 612b of the substrate 612 opposite to the mounting surface 612a, a corresponding space can be opened on the mounting surface 612a side. Therefore, interference with other components constituting the vehicle lamp 600 can be suppressed. In addition, as other components, for example, when other functional lamps are provided in the vehicle lamp 600, components of such other functional lamps can be cited.

[0239] In the vehicle lamp 600 of the present embodiment, one light source 611 is provided. According to this structure, by setting the number of light sources 611 to one, power consumption and heat generation can be reduced.

[0240] In the vehicle lamp 600 of the present embodiment, the size of the metasurface portion 621 in the short side direction (horizontal direction) of the slit 624 is larger than that of the slit 624, and the size in the long side direction (vertical direction) of the slit 624 is smaller than that of the slit 624. According to this structure, for light that is condensed in the short side direction of the slit 624 and diffused in the long side direction of the slit 624 in the metasurface portion 621, it can effectively pass through the slit 624.

[0241] The technical scope of the present disclosure is not limited to the above embodiments and can be appropriately changed without departing from the gist of the present disclosure. For example, in the above embodiment, the structure in which the vehicle lamp 600 is arranged at the front of the vehicle M is taken as an example for description, but it is not limited thereto. The vehicle lamp 600 may also be a structure arranged at the rear or side of the vehicle M, and is a structure that forms an irradiation pattern on the road surface behind or beside the vehicle M.

[0242] In addition, in the vehicle lamp 600 of the above embodiment, the structure in which the irradiation pattern P is formed on the road surface is taken as an example for description, but it is not limited thereto. For example, even if it is a structure that forms an irradiation pattern at a place other than the road surface in front of or behind the vehicle M, the technology of the present disclosure can be applied.

[0243] In addition, in the vehicle lamp 600 of the above-described embodiment, the case where the positioning portion 625 is constituted by the second opening portion 623b formed in the light-shielding portion 623 has been described as an example, but it is not limited thereto. The positioning portion 625 may be, for example, another structure such as a structure in which a corner portion of the light source-side lens 620 is cut off.

[0244] Reference Signs

[0245] AX - optical axis, C1 - first direction, C2 - second direction, D1, D2, D3, D4 - distances, L - light, M - vehicle, P - irradiation pattern, Q - reference position, T - condensing angle, 10 - light source unit, 11 - light source, 11a - light emitting surface, 12 - substrate, 20, 20A, 20B, 20C, 20D, 20E - condensing lenses, 20a, 41a - incident surfaces, 20b, 41b - exit surfaces, 21 - metasurface part, 22 - column part, 23, 23B, 23C, 23D, 23E, 64, 73, 74, 75, 164 - bonding layers, 24, 24B, 24C, 24D, 24E - stray light suppression parts, 25, 65 - positioning parts, 25E, 43b, 63a, 65F, 71a, 161a, 532a, 532b, 553b - openings, 26D - coating layer, 30 - light shielding member, 31 - slit forming part, 32, 44 - frame parts, 32a, 46a - positioning openings, 32b, 46b, 53b - fixing openings, 33 - slit, 40 - projection lens, 41 - lens part, 41a, 80a - incident surfaces, 41b, 80b - exit surfaces, 42 - cylindrical part, 43, 532 - protruding parts, 45 - annular part, 46 - strip part, 46c, 46d - contact parts, 50 - support member, 51 - base part, 51a - support surface, 52 - fin, 53 - fixing part, 53a - positioning protrusion, 53c - end face, 54 - threaded part, 60, 60F, 160, 260 - frame members, 62, 62F, 162, 262 - wall parts, 63, 63F, 163, 263 - support parts, 70 - cover member, 71 - spacer, 80 - light source side lens, 81 - metasurface part, 81a - reference area, 81b, 81c - peak positions, 82 - column part, 83 - central area, 84, 85, 86 - peripheral areas, 90 - fixing member, 100, 200, 300, 400, 500, 600 - vehicle lamps, 262a - ventilation part, 553 - fixing part, 553a - protrusion, 610 - light source unit, 611 - light source, 611a - light emitting surface, 612 - substrate, 612a - mounting surface, 612b - connector surface, 614 - connector, 620 - light source side lens, 620a, 631a - incident surfaces, 620b, 631b - exit surfaces, 621 - metasurface part, 622 - column part, 623 - light shielding part, 623a - first opening, 623b - second opening, 624 - slit, 625 - positioning part, 630 - projection lens, 631 - lens part, 632 - leg part, 640 - frame member, 641 - base part, 641a - opening, 641c - ventilation part, 642 - wall part, 643 - support part, 644 - bonding layer.

Claims

1. A vehicle lamp, characterized in that, Comprising: A light source that emits light; A light source-side lens, which is plate-shaped and has a metasurface portion that transforms the wavefront of the light from the above-mentioned light source, and emits the light after the wavefront transformation; A light-shielding member that has a slit through which a part of the light emitted from the light source-side lens passes; and A projection lens that irradiates the light that has passed through the slit onto the road surface to form an irradiation pattern, The above-mentioned slit is formed in such a way that it has a long side direction in one direction, The above-mentioned metasurface portion has columnar portions, and the columnar portions are arranged at a predetermined pitch in a first direction parallel to the long side direction of the slit and in a second direction orthogonal to the first direction, with a reference position corresponding to the optical axis of the light source-side lens as the center, The above-mentioned metasurface portion has a central region that includes the above-mentioned reference position and includes a portion where the diameter of the columnar portions gradually decreases as it moves away from the reference position, In the above-mentioned central region, with respect to the above-mentioned reference position, the change in the diameter of the columnar portions on one side in the first direction is gentler than the change in the diameter of the columnar portions on the other side in the first direction.

2. The vehicle lamp according to claim 1, wherein In the above-mentioned central region of the above-mentioned metasurface portion, starting from the above-mentioned reference position, on one side and the other side in the second direction, the change in the diameter of the columnar portions is the same.

3. The vehicle lamp according to claim 1, wherein In the above-mentioned central region of the above-mentioned metasurface portion, starting from the above-mentioned reference position, the change in the diameter of the columnar portions on one side in the first direction is gentler than the change in the diameter of the columnar portions on one side or the other side in the second direction starting from the above-mentioned reference position.

4. The vehicle lamp according to claim 1, wherein In the above-mentioned central region of the above-mentioned metasurface portion, starting from the above-mentioned reference position, the change in the diameter of the columnar portions on the other side in the first direction is steeper than the change in the diameter of the columnar portions on one side or the other side in the second direction starting from the above-mentioned reference position.

5. The vehicle lamp according to claim 1, wherein In the above-mentioned central region of the above-mentioned metasurface portion, the peak position where the diameter of the columnar portions becomes the largest in the first direction is arranged on one side closer to the above-mentioned reference position.

6. The vehicle lamp according to claim 1, wherein In the above-mentioned central region, based on the above-mentioned reference position, the number of the columnar portions in the first direction is larger than the number of the columnar portions in the second direction.

7. The vehicle lamp according to claim 6, wherein In the above-mentioned central region, the number of the columnar portions arranged on one side in the first direction starting from the above-mentioned reference position is more than 20% larger than the number of the columnar portions respectively arranged on one side and the other side in the second direction starting from the above-mentioned reference position, and the number of the columnar portions arranged on the other side in the first direction starting from the above-mentioned reference position is less than 10% less than the number of the columnar portions respectively arranged on one side and the other side in the second direction starting from the above-mentioned reference position.

8. The vehicle lamp according to claim 1, characterized in that: The phase distribution of the metasurface part is set in such a way that the phase changes periodically from the central part including the reference position in the radial direction along the incident surface. The central region is a region corresponding to the first period of the phase distribution including the reference position. The metasurface part has a peripheral region, which is formed in a ring shape surrounding the central region and corresponds to the periods after the second period of the phase distribution. The peripheral region is formed such that the diameter of the column part gradually decreases as it moves away from the central region along the incident surface.

9. The vehicle lamp according to claim 8, characterized in that: The peripheral region is provided with multiple layers in the direction of leaving the central region towards the outside, and the number of peak positions where the diameter of the column part on the other side is the largest is larger than that on one side of the first direction.

10. A vehicle lamp, characterized in that, Comprising: A light source that emits light; A condenser lens that condenses the light emitted from the light source; and A projection lens that irradiates the light condensed by the condenser lens to form an irradiation pattern. The condenser lens is in a flat plate shape having an incident surface for the light from the light source to enter and an exit surface for the light entering from the incident surface to exit. The metasurface part for transforming the wavefront of the light from the light source into a converging direction is provided on the incident surface. It further comprises a stray light suppression part that shields the light entering the part of the condenser lens different from the metasurface part.

11. The vehicle lamp according to claim 10, characterized in that: The stray light suppression part is provided on the condenser lens.

12. The vehicle lamp according to claim 11, characterized in that: The stray light suppression part is provided around the metasurface part on the incident surface of the condenser lens.

13. The vehicle lamp according to claim 10, characterized in that, It further comprises: A light source substrate on which the light source is mounted; and A frame member that is fixed to the light source substrate and supports the condenser lens. The condenser lens is joined to the frame member via a bonding layer. The stray light suppression part includes at least a part of the bonding layer.

14. The vehicle lamp according to claim 10, wherein It further comprises: A cover member that supports the incident surface of the condenser lens, covers the metasurface part, and allows the light from the light source to pass through on the metasurface part side; and A spacer that is disposed between the cover member and the incident surface. The stray light suppression part is provided on the spacer.

15. The vehicle lamp according to claim 10, characterized in that: It further comprises a light shielding member having a slit through which a part of the light condensed by the condenser lens passes. The projection lens irradiates the light passing through the slit onto the road surface to form the irradiation pattern. The stray light suppression part is provided between the light source and the light shielding member.

16. A vehicle lamp, characterized in that, Comprising: A light source that emits light; A light source side lens, which has an incident surface into which light from the above-mentioned light source enters, a metasurface portion provided on the above-mentioned incident surface for transforming the wavefront of the above-mentioned light, an exit surface for emitting the light after the wavefront transformation, and a light-shielding portion provided on the above-mentioned exit surface and having a slit for allowing a part of the above-mentioned light to pass through; and A projection lens, which irradiates the above-mentioned light that has passed through the above-mentioned slit in the above-mentioned light source side lens to form an irradiation pattern.

17. The vehicle lamp according to claim 16, wherein The above-mentioned light-shielding portion is formed in a thin film shape using a metal material.

18. The vehicle lamp according to claim 17, wherein The above-mentioned light-shielding portion has a first opening portion that constitutes the above-mentioned slit.

19. The vehicle lamp according to claim 17, wherein It further includes: A light source substrate on which the above-mentioned light source is mounted; and A frame member fixed to the above-mentioned light source substrate, The above-mentioned light source side lens is supported by the above-mentioned frame member, A positioning portion is provided on at least one of the above-mentioned light source side lens and the above-mentioned frame member.

20. The vehicle lamp according to claim 19, wherein The above-mentioned light-shielding portion has a second opening portion corresponding to the above-mentioned positioning portion.

21. The vehicle lamp according to claim 19, wherein The above-mentioned light source substrate has a mounting surface for mounting the above-mentioned light source, The above-mentioned frame member is fixed to the above-mentioned mounting surface, It further includes a connector, which is provided on the surface of the above-mentioned light source substrate opposite to the above-mentioned mounting surface and is connected to the outside.

22. The vehicle lamp according to claim 16, wherein One above-mentioned light source is provided.

23. The vehicle lamp according to claim 16, wherein In the above-mentioned metasurface portion, the dimension in the short side direction of the above-mentioned slit is larger than the above-mentioned slit, and the dimension in the long side direction of the above-mentioned slit is smaller than the above-mentioned slit.

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