Vehicle interior lighting device

Abstract

To provide a vehicle interior lighting device capable of achieving suppression of increase in size and suppression of increase in manufacturing cost.SOLUTION: A vehicle interior lighting device 1 is a vehicle interior lighting device 1 which is mounted on a wall surface 3 of a vehicle interior to illuminate the vehicle interior, and includes a light source 21 disposed to emit light toward a direction opposite to the wall surface 3 side, and a reflection member 40 disposed to intersect with an optical axis of the light emitted by the light source 21, where the reflection member 40 has a first convex surface 141 disposed to intersect with an optical axis of the light source 21, and the reflection member 40 is inclined downward in a direction away from an intersection point between the optical axis and the first convex surface 141.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle interior lighting device. [Background technology]

[0002] Patent Document 1 discloses an in-vehicle air purifier in which a gap is provided between the ceiling and the casing, and indirect lighting having an LED element and a lens is disposed in the gap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-45185 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for vehicle interior lighting devices to be smaller in size and to have their manufacturing costs reduced.

[0005] In the in-vehicle air purifier of Patent Document 1, a gap for the LED element is provided between the ceiling and the casing, which increases the thickness of the in-vehicle air purifier. Furthermore, a lens is used to diffuse the light emitted by the LED element, but the lens increases the size of the in-vehicle air purifier and increases manufacturing costs. Therefore, the in-vehicle air purifier of Patent Document 1 has the problem of being unable to suppress both the increase in size and the increase in manufacturing costs.

[0006] In view of the above-mentioned problems, an object of the present disclosure is to provide a vehicle interior lighting device that can suppress an increase in size and an increase in manufacturing costs. [Means for solving the problem]

[0007] In one embodiment of the present disclosure, an interior lighting device for a vehicle is attached to a wall surface of the vehicle compartment and illuminates the vehicle compartment, and includes a light source arranged to emit light in a direction opposite to the wall surface, and a reflective member arranged to intersect with the optical axis of the light emitted by the light source, wherein the reflective member has a first convex surface arranged to intersect with the optical axis of the light source, and the reflective member is inclined downward in a direction away from the intersection of the optical axis and the first convex surface. [Effects of the Invention]

[0008] According to the vehicle interior lighting device of the present disclosure, it is possible to suppress an increase in size and an increase in manufacturing costs. [Brief explanation of the drawings]

[0009] [Figure 1A] FIG. 1A is a schematic perspective view showing the interior of a vehicle in which a vehicle interior lighting device according to an embodiment is arranged. [Figure 1B] FIG. 1B is a schematic perspective view of a vehicle interior lighting device according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the vehicle interior lighting device taken along line AA in FIG. 1B. [Figure 3] FIG. 3 is a plan view showing a plurality of light sources and a reflecting member. [Figure 4] FIG. 4 is a cross-sectional view of the vehicle interior lighting device taken along line BB in FIG. 1B. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0011] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, components, arrangement positions and connection forms of the components, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not recited in the independent claims are described as optional components.

[0012] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0013] 1B, a predetermined direction orthogonal to the thickness direction of the flat interior lighting device is defined as the X-axis positive direction, a direction orthogonal to the X-axis positive direction is defined as the Y-axis positive direction, and a direction perpendicular to the X-axis positive direction and the Y-axis positive direction, which is the thickness direction of the flat interior lighting device, is defined as the Z-axis positive direction. The directions in FIG. 1B are also applied to FIG. 2 and subsequent figures.

[0014] Furthermore, in the following embodiments, expressions such as X-axis direction, rectangular shape, and approximately parallel are used. For example, X-axis direction does not only mean the perfect X-axis direction, rectangular shape means a perfect rectangle, and approximately parallel means completely parallel, but also means substantially X-axis direction, substantially rectangular, and substantially parallel, that is, including an error of, for example, a few percent. Furthermore, X-axis direction, rectangular shape, and approximately parallel mean X-axis direction, rectangular shape, and approximately parallel within the range in which the effects of the present disclosure can be achieved. The same applies to other expressions using "direction," "shape," and "approximately."

[0015] (Embodiment) <Configuration> Hereinafter, the vehicle interior lighting device 1 of the present disclosure will be specifically described with reference to FIGS. 1A to 4. FIG.

[0016] FIG. 1A is a schematic perspective view showing the interior of a vehicle in which a vehicle interior lighting device 1 according to an embodiment is disposed. FIG. 1B is a schematic perspective view of the vehicle interior lighting device 1 according to an embodiment. (a) of FIG. 1B shows a state in which the vehicle interior lighting device 1 is turned off. (b) of FIG. 1B shows a state in which the vehicle interior lighting device 1 is turned on. FIG. 2 is a cross-sectional view of the vehicle interior lighting device 1 taken along line AA in FIG. 1B. FIG. 3 is a plan view showing a plurality of light sources 21 and a reflective member 40. The substrate 22 is indicated by a two-dot chain line. FIG. 4 is a cross-sectional view of the vehicle interior lighting device 1 taken along line BB in FIG. 1B.

[0017] 1A and 1B (a) and (b), the vehicle interior lighting device 1 is a room lamp that is attached to a wall surface 3 of the vehicle interior and can illuminate the interior of the vehicle. Note that the vehicle interior lighting device 1 may be a lighting device integrated with vehicle interior equipment installed in the vehicle interior, or a lighting device mounted on an overhead console, etc. In this embodiment, the wall surface 3 is set to be approximately parallel to the XY plane.

[0018] The vehicle interior lighting device 1 is a plate-like device that is flat in the Z-axis direction and substantially parallel to the XY plane. The vehicle interior lighting device 1 has a rectangular or circular shape in plan view. The shape of the vehicle interior lighting device 1 may be other known shapes and is not limited to the shape of this embodiment. In this embodiment, a rectangular vehicle interior lighting device 1 is exemplified.

[0019] Specifically, as shown in FIGS. 1B and 2, the vehicle interior lighting device 1 includes a support member 10, a light emitting module 20, a lighting control unit (not shown), and a device main body.

[0020] The support member 10 is attached to a wall surface 3 of the vehicle compartment. In this embodiment, the support member 10 is attached to the wall surface 3 of the ceiling of the vehicle compartment. The support member 10 is attached to the wall surface 3 by fastening members such as bolts and screws (not shown).

[0021] The support member 10 is a plate-like member that is flat in the Z-axis direction and has a rectangular or circular shape that corresponds to the shape of the vehicle interior lighting device 1. The shape of the support member 10 may be any other known shape and is not limited to that of the present embodiment. The support member 10 is disposed along the wall surface 3 of the vehicle interior, that is, disposed on the wall surface 3 so as to be approximately parallel to the XY plane.

[0022] The support member 10 may house an illumination control unit for controlling the light-emitting module 20. Furthermore, the support member 10 may house a power supply circuit for supplying direct current to the light-emitting module 20. In this case, the power supply circuit may be included in the components of the vehicle interior lighting device 1.

[0023] Specifically, the support member 10 supports the substrate 22 of the light-emitting module 20 and has a support body 11 attached to the wall surface 3 of the vehicle compartment, and a translucent flange 12.

[0024] The support body 11 is a member that is flat in the Z-axis direction and has a rectangular or circular shape that corresponds to the shape of the vehicle interior lighting device 1. The shape of the support body 11 may be any other known shape and is not limited to the present embodiment. The light-emitting module 20 is attached to the surface of the support body 11 on the negative Z-axis direction side. An annular flange 12 that extends in the outer direction is formed on the annular outer peripheral side surface of the support body 11. The flange 12 is formed along the annular outer peripheral side surface of the support body 11.

[0025] The entire support member 10 may be made of a light-transmitting material, or only the flange 12 may be made of a light-transmitting material. The flange 12 may have a light-diffusing function. For example, the flange 12 may be textured or coated with a light-diffusing material. The light-transmitting material may be, for example, an acrylic resin.

[0026] The light emitting module 20 includes a light source 21 and a substrate 22 .

[0027] Each of the multiple light sources 21 can emit, for example, white light. Each of the multiple light sources 21 is, for example, an LED (Light Emitting Diode). Specifically, each of the multiple light sources 21 is, for example, a blue light-emitting element that emits blue light. Note that, as the multiple light sources 21, green light-emitting elements that emit green light and / or red light-emitting elements that emit red light can also be used. In each of the multiple light sources 21, a yellow phosphor that is a wavelength converter is disposed on the light emission side of the blue light-emitting element. The yellow phosphor is a phosphor that is excited by blue light and emits yellow light. Each of the multiple light sources 21 can emit white light that is a mixture of blue light and yellow light. In other words, the multiple light sources 21 can emit light that can illuminate the interior of the vehicle.

[0028] The plurality of light sources 21 are arranged in a row along the outer peripheral edge portion 22a of the substrate 22. In the embodiment, the substrate 22 has a circular or rectangular shape corresponding to the shape of the vehicle interior lighting device 1, and therefore the plurality of light sources 21 are arranged in a ring shape along the outer peripheral edge portion 22a of the substrate 22.

[0029] The substrate 22 is, for example, a rigid substrate, but may also be a flexible substrate. The substrate 22 is provided with pattern wiring for supplying direct current from a power supply circuit to each of the plurality of light sources 21, for example.

[0030] As shown in FIGS. 2 and 3 , the substrate 22 is attached to the surface of the support member 10 on the negative Z-axis side so as to be oriented substantially parallel to the XY plane. A plurality of light sources 21 are mounted on the surface of the substrate 22 on the negative Z-axis side. That is, each of the light sources 21 is disposed in the vehicle interior lighting device 1 so that its optical axis is substantially parallel to the Z-axis direction and the light is emitted in the negative Z-axis direction. Therefore, when the vehicle interior lighting device 1 is attached to a ceiling wall surface 3 in the vehicle interior, each of the light sources 21 emits light vertically downward. The light emitted vertically downward from the light source 21 is reflected by a reflecting member 40 (described later) and irradiated onto the wall surface 3 of the vehicle interior. This allows the interior of the vehicle to be indirectly illuminated. The optical axis is the axis of the main light emitted by the light source 21.

[0031] The lighting control unit can control the lighting mode of the light-emitting module 20. For example, the lighting control unit may include a dimming circuit and a color-adjusting circuit that can adjust the brightness and color of each of the multiple light sources 21. In this case, the lighting control unit has a dimming function that can adjust the brightness and color of the light emitted by each of the multiple light sources 21. The lighting control unit can achieve the dimming function and the color-adjusting function by controlling the amount of current supplied from the power supply circuit to each of the multiple light sources 21.

[0032] Furthermore, the illumination control unit can also control the on / off and light emission time of each of the plurality of light sources 21 by controlling the current supplied to the light emitting module 20.

[0033] The lighting control unit is realized by, for example, an LSI (Large Scale Integration), which is an integrated circuit (IC). Note that the integrated circuit is not limited to an LSI, and may be a dedicated circuit or a general-purpose processor. In the embodiment, the lighting control unit is a microcontroller. The microcontroller includes, for example, a non-volatile memory in which a program is stored, a volatile memory which is a temporary storage area for executing the program, an input / output port, and a processor which executes the program. Furthermore, the lighting control unit may be a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which the connections and settings of circuit cells in the LSI can be reconfigured. The functions performed by the lighting control unit may be realized by software or by hardware.

[0034] 2, the device body is a plate-like member that is flat in the Z-axis direction and has a rectangular or circular shape corresponding to the shape of the vehicle interior lighting device 1. The shape of the device body may be any other known shape and is not limited to that of the present embodiment. The device body is disposed along the wall surface 3 of the vehicle interior, that is, attached to the surface of the substrate 22 on the negative Z-axis side so as to be substantially parallel to the XY plane.

[0035] A storage space for storing small items may be formed in the center of the device body, and another lighting device may be placed therein, an audio device may be placed therein, or an operation panel for operating the in-vehicle equipment may be placed therein.

[0036] An annular groove 41 is formed along the outer peripheral edge of the device body. The groove 41 is recessed in the negative Z-axis direction from the surface of the device body on the positive Z-axis side.

[0037] When the device main body is attached to the light-emitting module 20, the substrate 22 of the light-emitting module 20 is disposed so as to protrude radially (along the XY plane) from the center of the device main body surrounded by the groove 41 of the device main body. The multiple light sources 21 are disposed along the outer peripheral edge 22a of the substrate 22, and therefore the groove 41 of the device main body is disposed on the surface of the protruding portion of the substrate 22 on the negative Z-axis direction side. Therefore, the multiple light sources 21 are disposed along the longitudinal direction of the groove 41. It can be said that the groove 41 is formed along the arrangement direction of the multiple light sources 21.

[0038] The device body may be a reflective member 40 (having a light reflecting function) that reflects light emitted from each of the plurality of light sources 21. Furthermore, the groove portion 41 of the device body may be a reflective member 40 that reflects light emitted from each of the plurality of light sources 21. In this embodiment, the device body is configured with a reflective member 40.

[0039] The reflective member 40 is a member made of a white resin material, a member made of a metal material painted white, a member made of a metal material such as aluminum, or a member made of a resin material with a metal film added.

[0040] The multiple light sources 21 are positioned within grooves 41. The reflecting member 40 is disposed so as to intersect with the optical axis of the light emitted from each of the multiple light sources 21. This allows the reflecting member 40 to reflect the light emitted from each of the multiple light sources 21 toward the wall surface 3 of the vehicle interior. The optical axis is an axis extending from the light source 21 in the negative Z-axis direction.

[0041] Here, the configuration of the grooves 41 formed in the reflecting member 40 of the device body will be described in more detail.

[0042] As shown in Fig. 4, the groove 41 has a one-side edge 43a and an other-side edge 43b that form the opening 42 of the groove 41. The one-side edge 43a faces the other-side edge 43b across the opening 42. As shown in Fig. 3, in this embodiment, the groove 41 has an annular shape when viewed from the Z-axis direction, and therefore the one-side edge 43a and the other-side edge 43b also have an annular shape. The one-side edge 43a is located on the inner periphery of the groove 41, and the other-side edge 43b is located on the outer periphery of the groove 41 and has a larger diameter than the one-side edge 43a.

[0043] As shown in FIG. 4, when the device main body is attached to the light-emitting module 20, the substrate 22 is disposed so as to protrude from the one-side edge 43a toward the other-side edge 43b. At this time, the substrate 22 is disposed so as not to block the opening 42 between the one-side edge 43a and the other-side edge 43b. In other words, a gap S is formed between the outer peripheral edge 22a of the substrate 22 and the other-side edge 43b of the groove 41. The multiple light sources 21 are disposed along the outer peripheral edge 22a of the substrate 22, and therefore are disposed along the one-side edge 43a and the other-side edge 43b. As a result, light emitted from each of the multiple light sources 21 and reflected by the reflective member 40 passes through this gap S and is irradiated onto the wall surface 3 of the vehicle interior.

[0044] When the multiple light sources 21, the one-side edge portion 43a, and the other-side edge portion 43b are viewed overlapping each other (when viewed along the X-axis direction or the Y-axis direction), the other-side edge portion 43b has a standing wall portion 44 that covers the multiple light sources 21. The standing wall portion 44 extends in the positive direction of the Z-axis so as to be closer to the wall surface 3 of the vehicle interior than the one-side edge portion 43a.

[0045] A gap S between the outer peripheral edge 22a of the substrate 22 and the other-side edge 43b is covered by a light-transmitting flange 12 that extends from the outer peripheral side surface of the support body 11 toward the other-side edge 43b. The tip of the annular flange 12 abuts against the tip of the annular other-side edge 43b, specifically, against the annular standing wall 44. For this reason, the flange 12 is disposed so as to cover this gap S.

[0046] When the flange 12 and the other-side edge 43b are viewed overlapping each other (when viewed along the X-axis direction or the Y-axis direction), the standing wall 44 extends to cover the flange 12. Therefore, when the vehicle interior lighting device 1 is turned on, the standing wall 44 can reflect light emitted from the translucent flange 12 along the X-axis direction and the Y-axis direction. Therefore, the light is emitted from the gap S between the outer peripheral edge 22a of the substrate 22 and the other-side edge 43b of the groove 41 and irradiated onto the wall surface 3 of the vehicle interior, so that the amount of light irradiated onto the wall surface 3 of the vehicle interior can be ensured.

[0047] As shown in Figure 2, the groove portion 41 has a first convex surface 141 arranged so as to intersect with the optical axis of the light source 21, a concave surface 143 recessed relative to the first convex surface 141, and a second convex surface 142 protruding relative to the concave surface 143.

[0048] The first convex surface 141, the concave surface 143, and the second convex surface 142 are formed on an inner surface 45 of the groove portion 41. The inner surface 45 of the groove portion 41 is composed of a first side surface 45a on the outer periphery of the one-side edge portion 43a, a second side surface 45b on the inner periphery of the other-side edge portion 43b, and a bottom surface 45c (surface on the negative Z-axis direction side) between the one-side edge portion 43a and the other-side edge portion 43b and facing the opening 42. The second side surface 45b of the other-side edge portion 43b faces the first side surface 45a of the one-side edge portion 43a, the light-emitting module 20, and the flange portion 12. The inner surface 45 of the groove portion 41 is formed along the longitudinal direction of the groove portion 41 so that the first convex surface 141, the concave surface 143, the second convex surface 142, and the concave surface 143 are arranged in this order repeatedly. In this embodiment, the first convex surface 141, the concave surface 143, the second convex surface 142 and the concave surface 143 are formed on the bottom surface 45c of the groove portion 41 along the longitudinal direction of the groove portion 41, so that the order of the first convex surface 141, the concave surface 143, the second convex surface 142 and the concave surface 143 is repeated.

[0049] The heights of the first convex surface 141 and the second convex surface 142 may be the same or different. The depth of the concave surface 143 may be the same as the heights of the first convex surface 141 and the second convex surface 142 or may be different.

[0050] On the bottom surface 45c of the groove portion 41, the first convex surface 141 and the concave surface 143 are arranged in this order, so that the bottom surface 45c slopes downward along the circumferential direction of the annular groove portion 41, in a direction away from the intersection of the optical axis and the first convex surface 141. Furthermore, because the concave surface 143 and the second convex surface 142 are arranged in this order, the bottom surface 45c slopes downward and then upward. Furthermore, because the second convex surface 142 and the concave surface 143 are arranged in this order, the bottom surface 45c of the annular groove portion 41 has a wave surface formed by repeating this order of the first convex surface 141, the concave surface 143, the second convex surface 142, and the concave surface 143.

[0051] As described above, on the bottom surface 45c of the groove portion 41, the first convex surface 141, the concave surface 143, the second convex surface 142, and the plurality of light sources 21 have the following relationships.

[0052] The plurality of light sources 21 are arranged in a one-to-one correspondence with the plurality of first convex surfaces 141. Specifically, the plurality of light sources 21 are arranged in a one-to-one correspondence such that the optical axes of the plurality of light sources 21 intersect with the plurality of first convex surfaces 141. In the present embodiment, the optical axes of the plurality of light sources 21 intersect with the vertices of the plurality of first convex surfaces 141 in a one-to-one correspondence.

[0053] In this case, on the bottom surface 45c of the groove portion 41 where the arrangement order of the first convex surface 141, the concave surface 143, the second convex surface 142, and the concave surface 143 is repeated, the second convex surface 142 is arranged so as to correspond to the space between two adjacent light sources 21 among the plurality of light sources 21. In other words, the second convex surface 142 is arranged between the optical axes of two adjacent light sources 21 among the plurality of light sources 21. In the present embodiment, the concave surface 143, the second convex surface 142, and the concave surface 143 are arranged between the optical axes of two adjacent light sources 21 among the plurality of light sources 21. In this configuration, since the concave surface 143 and the second convex surface 142 are arranged between the two adjacent light sources 21 among the plurality of light sources 21, the light emitted from the light source 21 is reflected in the positive direction of the Z axis by an upslope spanning from the concave surface 143 to the second convex surface 142. As a result, the light emitted from each of the multiple light sources 21 and reflected on the uphill slope passes through the gap S between the outer peripheral edge 22a of the substrate 22 and the other side edge 43b of the groove portion 41, and is irradiated onto the wall surface 3 of the vehicle compartment.

[0054] The gradient of the first inclined surface 51 formed across the first convex surface 141 and the concave surface 143 is greater than the gradient of the second inclined surface 52 formed across the concave surface 143 and the second convex surface 142. In other words, the first convex surface 141 is steeper than the second convex surface 142. As a result, the direction of light emitted from the light source 21 and reflected by the first inclined surface 51 is different from the direction of light emitted from the light source 21 and reflected by the second inclined surface 52. Specifically, the angles of incidence and reflection of light incident on and reflected from the first inclined surface 51 are smaller than the angles of incidence and reflection of light incident on and reflected from the second inclined surface 52, so the light reflected by the first inclined surface 51 reaches a farther distance along the circumferential direction of the annular groove portion 41 than the light reflected by the second inclined surface 52. This makes it easier for the light emitted by the light sources 21 to mix, and the light emitted by each of the multiple light sources 21 and reflected by the reflective member 40 is more uniformly irradiated onto the wall surface 3 of the vehicle interior.

[0055] The concave surface 143 has a hemispherical shape in which the cross section when the reflecting member 40 is cut along the arrangement direction of the plurality of light sources 21 is an arc, and the cross section when the reflecting member 40 is cut along a direction perpendicular to the arrangement direction of the plurality of light sources 21 is also an arc. In other words, the concave surface 143 is formed in a hemispherical or bowl shape.

[0056] In this case, the light emitted from each of the multiple light sources 21 is reflected by the concave surface 143 of the reflecting member 40 and directed toward the positive direction of the Z axis. Therefore, the light is emitted from the gap S between the outer peripheral edge 22a of the substrate 22 and the other side edge 43b of the groove 41 and is irradiated onto the wall surface 3 of the vehicle interior, so that the amount of light irradiated onto the wall surface 3 of the vehicle interior can be ensured.

[0057] 2 and 4, in such a vehicle interior lighting device 1, light emitted from the light source 21 is incident on and reflected by the reflecting member 40, i.e., the bottom of the groove 41. The light reflected by the reflecting member 40 is incident on the flange 12 of the support member 10, which is disposed in the gap S between the outer peripheral edge 22a of the substrate 22 and the other side edge 43b of the groove 41. Because the flange 12 is translucent, the incident light passes through the flange 12 and is emitted to illuminate the wall surface 3 of the vehicle interior.

[0058] <Action and effect> The following describes the effects of the vehicle interior lighting device 1 according to this embodiment.

[0059] As described above, the vehicle interior lighting device 1 of technology 1 in this embodiment is attached to the wall surface 3 of the vehicle interior and illuminates the vehicle interior, and includes a light source 21 arranged to emit light in the direction opposite to the wall surface 3, and a reflecting member 40 arranged to intersect with the optical axis of the light emitted by the light source 21, and the reflecting member 40 has a first convex surface 141 arranged to intersect with the optical axis of the light source 21, and the reflecting member 40 is inclined downward in a direction away from the intersection of the optical axis and the first convex surface 141.

[0060] For example, in the conventional configuration in which the light source is disposed between the support member and the wall surface, the thickness of the vehicle interior lighting device increases, resulting in an increase in the size of the vehicle interior lighting device.

[0061] However, according to this embodiment, in order to irradiate light to the outside and illuminate the interior of the vehicle compartment, light source 21 is arranged so that the optical axis of the light is oriented in a direction perpendicular to the wall surface 3 of the vehicle compartment, and reflective member 40 is arranged opposite light source 21, so that the wall surface 3 of the vehicle compartment can be illuminated, eliminating the need to arrange light source 21 between support member 10 and wall surface 3. Since light source 21 and reflective member 40 can be arranged in different locations, an increase in the thickness of vehicle interior lighting device 1 can be suppressed.

[0062] Furthermore, with the light source 21 and the reflecting member 40 arranged in this manner, the light emitted from the light source 21 is reflected by the reflecting member 40 and irradiated onto the vehicle interior wall surface 3. In this embodiment, the optical path length of the light emitted from the light source 21 can be made longer than the optical path length when the light emitted from the light source is directly irradiated onto the vehicle interior wall surface. This eliminates the need to diffuse the light emitted from the light source using a lens as in the prior art. As a result, it is possible to prevent the vehicle interior lighting device 1 from becoming larger and the manufacturing costs from rising.

[0063] Therefore, according to this vehicle interior lighting device 1, it is possible to prevent the device from becoming too large and the manufacturing costs from rising.

[0064] The vehicle interior lighting device 1 of Technology 2 in this embodiment is the vehicle interior lighting device 1 described in Technology 1. In this case, the reflective member 40 further has a concave surface 143 recessed relative to the first convex surface 141, and the reflective member 40 is formed so that the first convex surface 141 and the concave surface 143 are arranged in this order.

[0065] According to this, the direction in which the light emitted from light source 21 is reflected by first convex surface 141 differs from the direction in which the light emitted from light source 21 is reflected by concave surface 143. Since the light emitted from light source 21 is more likely to be reflected by reflecting member 40 and mixed, the light reflected by reflecting member 40 is more uniform and more likely to be irradiated onto wall surface 3 of the vehicle interior. As a result, uneven brightness of the light irradiated onto wall surface 3 of the vehicle interior can be suppressed.

[0066] Furthermore, the vehicle interior lighting device 1 according to Technology 3 of this embodiment is the vehicle interior lighting device 1 described in Technology 2. In this case, the reflecting member 40 further has a second convex surface 142 that protrudes relative to the concave surface 143, and the reflecting member 40 is formed so that the first convex surface 141, the concave surface 143, and the second convex surface 142 are arranged in this order, and the gradient of the first inclined surface 51 formed across the first convex surface 141 and the concave surface 143 is greater than the gradient of the second inclined surface 52 formed across the concave surface 143 and the second convex surface 142.

[0067] According to this, the angle of incidence and the angle of reflection of light incident on and reflected from the first inclined surface 51 are smaller than the angle of incidence and the angle of reflection of light incident on and reflected from the second inclined surface 52, so the light reflected from the first inclined surface 51 reaches a farther distance than the light reflected from the second inclined surface 52. Since the light emitted from the light source 21 is reflected by the reflecting member 40 and is more likely to be mixed, the light reflected by the reflecting member 40 is more uniform and is irradiated onto the wall surface 3 of the vehicle interior. As a result, uneven brightness of the light irradiated onto the wall surface 3 of the vehicle interior can be suppressed.

[0068] Furthermore, the vehicle interior lighting device 1 of Technology 4 in this embodiment is the vehicle interior lighting device 1 described in Technology 3. In this case, the vehicle interior lighting device 1 includes a plurality of light sources 21, and the second convex surface 142 is disposed so as to correspond to a space between two adjacent light sources 21 among the plurality of light sources 21.

[0069] For example, when a light source is placed on the positive Z-axis side of the second convex surface, the second convex surface has a gentler slope than the first convex surface, so even if the light emitted by the light source is reflected by the second convex surface, it is less likely to reach farther along the arrangement direction of the multiple light sources than it would be on the first convex surface.

[0070] However, according to the present embodiment, the second convex surface 142 is disposed so as to correspond to the space between two adjacent light sources 21, and therefore the wall surface 3 located directly above the second convex surface 142 (in the positive direction of the Z axis) does not become excessively bright. Therefore, the light emitted by the light source 21 and reflected by the reflective member 40 is more uniformly irradiated onto the wall surface 3 of the vehicle interior. As a result, uneven brightness of the light irradiated onto the wall surface 3 of the vehicle interior can be suppressed. Furthermore, two corresponding second inclined surfaces 52 can be formed on one second convex surface 142 so as to reflect the light emitted by each of the two adjacent light sources 21.

[0071] Furthermore, the vehicle interior lighting device 1 of Technology 5 in this embodiment is the vehicle interior lighting device 1 described in Technology 1. In this case, the reflective member 40 further has a concave surface 143 recessed relative to the first convex surface 141 and a second convex surface 142 protruding relative to the concave surface 143, and the reflective member 40 is formed so that this order of the first convex surface 141, the concave surface 143, the second convex surface 142, and the concave surface 143 is repeated.

[0072] This allows the reflective member 40 to reflect more uniform light, which can be irradiated onto the vehicle interior wall surface 3 along the longitudinal direction of the groove portion 41. As a result, it is possible to suppress uneven brightness of the light irradiated onto the vehicle interior wall surface 3.

[0073] The vehicle interior lighting device 1 of Technology 6 in this embodiment is the vehicle interior lighting device 1 according to any one of Technologies 1 to 3. In this case, the vehicle interior lighting device 1 includes a plurality of light sources 21, and the plurality of light sources 21 are arranged in one-to-one correspondence with the plurality of first convex surfaces 141.

[0074] This allows the reflective member 40 to reflect light from each light source 21, making it possible to irradiate more uniform light onto the vehicle interior wall surface 3. As a result, it is possible to suppress uneven brightness of the light irradiated onto the vehicle interior wall surface 3.

[0075] The vehicle interior lighting device 1 of Technology 7 in this embodiment is the vehicle interior lighting device 1 described in Technology 4 or 6. In this case, the concave surface 143 has a hemispherical shape, in which the cross section when the reflective member 40 is cut along the arrangement direction of the plurality of light sources 21 is an arc shape, and the cross section when the reflective member 40 is cut along a direction perpendicular to the arrangement direction of the plurality of light sources 21 is also an arc shape.

[0076] According to this, in the arrangement direction of the plurality of light sources 21, the direction in which the light emitted from the light source 21 is reflected by the first inclined surface 51 differs from the direction in which the light emitted from the light source 21 is reflected by the second inclined surface 52. This makes it easier for the light emitted from the light source 21 to be mixed. As a result, the light emitted from the light source 21 and reflected by the reflective member 40 becomes more uniform and is more easily irradiated onto the wall surface 3 of the vehicle interior.

[0077] Furthermore, in a direction perpendicular to the arrangement direction of the plurality of light sources 21, the light emitted from each of the plurality of light sources 21 is reflected by the concave surface 143 of the reflecting member 40 and tends to head toward the vehicle interior wall surface 3. As a result, the light passes through the gap S between the outer peripheral edge portion 22a of the substrate 22 and the other side edge portion 43b of the groove portion 41 and tends to be irradiated onto the vehicle interior wall surface 3, so that the amount of light irradiated onto the vehicle interior wall surface 3 can be ensured.

[0078] Furthermore, the vehicle interior lighting device 1 of Technology 8 in this embodiment is the vehicle interior lighting device 1 described in Technology 7. In this case, the reflective member 40 has grooves 41 formed along the arrangement direction of the plurality of light sources 21, and an inner surface 45 of the grooves 41 is formed along the longitudinal direction of the grooves 41 so that the arrangement order of the first convex surface 141, the concave surface 143, the second convex surface 142, and the concave surface 143 is repeated, and the plurality of light sources 21 are arranged in the grooves 41.

[0079] This allows the reflective member 40 to reflect more uniform light, which can be irradiated onto the vehicle interior wall surface 3 along the longitudinal direction of the groove portion 41. As a result, it is possible to suppress uneven brightness of the light irradiated onto the vehicle interior wall surface 3.

[0080] Furthermore, since a plurality of light sources 21 can be arranged in the groove portion 41, it is possible to prevent an increase in the thickness of the vehicle interior lighting device 1. Therefore, it is possible to prevent the vehicle interior lighting device 1 from becoming larger.

[0081] Furthermore, the vehicle interior lighting device 1 of Technology 9 in this embodiment is the vehicle interior lighting device 1 described in Technology 8. In this case, the groove portion 41 has one side edge portion 43a and the other side edge portion 43b that form the opening 42, the one side edge portion 43a faces the other side edge portion 43b across the opening 42, the multiple light sources 21 are arranged along the one side edge portion 43a, and the other side edge portion 43b has a standing wall portion 44 that extends in the opposite direction to the direction of light emitted from the multiple light sources 21 along the optical axis so as to cover the multiple light sources 21 when viewed along the arrangement direction of the multiple light sources 21 and the one side edge portion 43a.

[0082] With this, when the vehicle interior lighting device 1 is turned on, the upright wall portion 44, which has a light reflecting function, can reflect light along the X-axis direction and the Y-axis direction. The light passes through the gap S between the outer peripheral edge portion 22a of the substrate 22 and the other side edge portion 43b of the groove portion 41 and is easily irradiated onto the wall surface 3 of the vehicle interior, so that the amount of light irradiated onto the wall surface 3 of the vehicle interior can be ensured.

[0083] Furthermore, the vehicle interior lighting device 1 of Technology 10 in this embodiment is the vehicle interior lighting device 1 described in Technology 9. In this case, the vehicle interior lighting device 1 includes a substrate 22 on which a plurality of light sources 21 are mounted, and a support member 10. The support member 10 supports the substrate 22 and has a support main body 11 attached to a wall surface 3 of the vehicle interior, and a translucent flange 12 extending from the support main body 11 toward the other side edge 43b and abutting the other side edge 43b.

[0084] This allows the flange 12 to cover the gap S between the other-side edge 43b and the substrate 22, making it difficult for foreign matter to enter the groove 41. As a result, it is possible to suppress uneven brightness of the light irradiated onto the wall surface 3 of the vehicle interior.

[0085] The vehicle interior lighting device 1 of Technology 11 in this embodiment is the vehicle interior lighting device 1 described in Technology 10. In this case, the standing wall portion 44 extends to cover the flange portion 12 when viewed along the alignment direction of the flange portion 12 and the other-side edge portion 43b.

[0086] With this, when the vehicle interior lighting device 1 is turned on, the upright wall portion 44, which has a light reflecting function, can reflect the light emitted from the flange portion 12 along the X-axis direction and the Y-axis direction. The light passes through the gap S between the outer peripheral edge portion 22a of the substrate 22 and the other side edge portion 43b of the groove portion 41 and is easily irradiated onto the wall surface 3 of the vehicle interior, so that the amount of light irradiated onto the wall surface 3 of the vehicle interior can be ensured.

[0087] (Other variations) While the vehicle interior lighting device according to the present disclosure has been described above based on the above-mentioned embodiments, the present disclosure is not limited to these embodiments. As long as the modifications do not deviate from the spirit of the present disclosure, various modifications conceivable by those skilled in the art may also be included within the scope of the present disclosure.

[0088] In addition, this disclosure also includes forms obtained by making various modifications to the above embodiments that a person skilled in the art would think of, and forms realized by arbitrarily combining the components and functions of the embodiments within the scope that does not deviate from the intent of this disclosure. [Industrial Applicability]

[0089] The present disclosure can be used, for example, in a lighting device for the interior of a moving body such as a vehicle. [Explanation of symbols]

[0090] 1 Vehicle interior lighting system 3 Wall 10 Support member 11 Support body part 12 Tsuba section 21 Light source 22 PCB 40 Reflective material 41 Groove 43a One side edge 43b Other side edge 44 Vertical wall 45 Inner 51 1st slope 52 Second slope 141 1st convex surface 142 Second convex surface 143 Concave surface

Claims

1. A vehicle interior lighting device that is attached to a wall surface of a vehicle interior and illuminates the vehicle interior, a light source disposed to emit light in a direction opposite to the wall surface; a reflecting member disposed so as to intersect with an optical axis of the light emitted by the light source, the reflecting member has a first convex surface disposed so as to intersect with the optical axis of the light source; The reflecting member is inclined downward in a direction away from the intersection point between the optical axis and the first convex surface. Vehicle interior lighting system.

2. the reflecting member further has a concave surface recessed relative to the first convex surface, The reflecting member is formed so that the first convex surface and the concave surface are arranged in this order. The vehicle interior lighting device according to claim 1 .

3. the reflecting member further has a second convex surface that protrudes relative to the concave surface, the reflecting member is formed so that the first convex surface, the concave surface, and the second convex surface are arranged in this order, The gradient of a first inclined surface formed across the first convex surface and the concave surface is greater than the gradient of a second inclined surface formed across the concave surface and the second convex surface. The vehicle interior lighting device according to claim 2.

4. The vehicle interior lighting device includes a plurality of the light sources, The second convex surface is disposed so as to correspond to a space between two adjacent light sources among the plurality of light sources. The vehicle interior lighting device according to claim 3.

5. the reflecting member further has a concave surface recessed relative to the first convex surface and a second convex surface protruding relative to the concave surface, The reflecting member is formed so that the first convex surface, the concave surface, the second convex surface, and the concave surface are arranged in this order repeatedly. The vehicle interior lighting device according to claim 1 .

6. The vehicle interior lighting device includes a plurality of the light sources, The plurality of light sources are arranged in a one-to-one correspondence with the plurality of first convex surfaces. The vehicle interior lighting device according to any one of claims 1 to 3.

7. The concave surface has a hemispherical shape, in which a cross section of the reflecting member cut along the arrangement direction of the plurality of light sources is arc-shaped, and a cross section of the reflecting member cut along a direction perpendicular to the arrangement direction of the plurality of light sources is also arc-shaped.

5. The vehicle interior lighting device according to claim 4.

8. The reflecting member has a groove formed along an arrangement direction of the plurality of light sources, the first convex surface, the concave surface, the second convex surface, and the concave surface are formed on the inner surface of the groove along the longitudinal direction of the groove so as to be arranged in a repeated order; The plurality of light sources are disposed in the groove.

8. The vehicle interior lighting device according to claim 7.

9. the groove has one side edge and the other side edge that form an opening; the one-side edge portion faces the other-side edge portion across the opening, The plurality of light sources are arranged along the one side edge portion, The other-side edge portion has a standing wall portion extending in a direction opposite to the direction of light emitted from the plurality of light sources along the optical axis so as to cover the plurality of light sources when viewed along the arrangement direction of the plurality of light sources and the one-side edge portion.

9. The vehicle interior lighting device according to claim 8.

10. a substrate on which a plurality of the light sources are mounted; a support member; The support member supports the substrate and has a support body portion attached to the wall surface of the vehicle compartment, and a light-transmitting flange portion extending from the support body portion toward the other side edge portion and abutting against the other side edge portion. The vehicle interior lighting device according to claim 9.

11. The upright wall portion extends to cover the flange portion when viewed along the direction in which the flange portion and the other-side edge portion are aligned. The vehicle interior lighting device according to claim 10.

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