Lighting device

Abstract

A lighting device (1) comprises: a light source (10) having a light emission surface (11) that emits light; a first light-shielding member (20) having a first opening (21) through which a portion of the light emitted from the light source (10) passes, and a first light-shielding part (22) that shields a portion of the outer peripheral region of the light emitted from the light source (10); a lens (30) that condenses the light that has passed through the first opening (21); a second light-shielding member (40) having a second opening (41) through which a portion of the light emitted from the lens (30) passes, and a second light-shielding part (42) that shields a portion of the outer peripheral region of the light emitted from the lens (30); and a shade (50) positioned on the reverse side of the second light-shielding member (40) from the lens (30) and configured to surround the second opening (41) when viewed from the optical axis direction of the light source (10).

Description

lighting equipment

[0001] The present disclosure relates to a lighting device, for example, a vehicle interior lighting device installed in the interior of an automobile.

[0002] A spotlight is a known lighting device that can illuminate an area more brightly with illumination light. A spotlight irradiates a specific narrow area with illumination light by concentrating light emitted from a light source using a lens.

[0003] As an example of this type of lighting device, Patent Document 1 discloses a spotlight that uses two lenses to suppress the spread of light emitted from a light source, thereby increasing the light utilization efficiency, and also blocks unnecessary light using a light-blocking member.

[0004] Japanese Patent Application Laid-Open No. 2014-175126

[0005] However, in the spotlight disclosed in Patent Document 1, the opening diameter of the light-blocking member is large, so stray light generated inside the housing cannot be completely blocked, and the user may experience glare due to the light caused by this stray light. Moreover, in the spotlight disclosed in Patent Document 1, the light exit surface (light-emitting surface) of the second lens, which is the light exit portion of the spotlight, is largely exposed, so the light exit surface of the second lens is conspicuous and the external design is poor.

[0006] In recent years, there has been a demand for the interior of a vehicle such as an automobile to be an environment in which occupants can spend time comfortably. In particular, in the future, it is expected that autonomous driving technology will enable occupants, including the driver, to engage in various activities unrelated to driving while the vehicle is moving, so the interior of the vehicle must be a living space that is more user-friendly and comfortable. Therefore, technology is being considered that installs lighting devices in the interior of an automobile and creates a space within the interior using illumination light emitted from the lighting devices.

[0007] However, if a lighting device is simply installed inside the vehicle cabin, the light-emitting part of the lighting device (e.g., a translucent cover) will be exposed inside the vehicle cabin, causing the illumination light to be shone onto the faces of occupants, causing them to feel glare, and the light-emitting part of the lighting device will be visible to occupants, resulting in a poor exterior design.

[0008] The present disclosure has been made to solve such problems, and aims to provide a lighting device that can reduce the glare felt by the user and has an excellent appearance design.

[0009] In order to achieve the above object, one aspect of the lighting device according to the present disclosure includes: a light source having a light emission surface that emits light; a first shading member having a first opening through which a portion of the light emitted from the light source passes and a first shading portion that blocks a portion of an outer peripheral region of the light emitted from the light source; a lens that collects the light that has passed through the first opening; a second shading member having a second opening through which a portion of the light emitted from the lens passes and a second shading portion that blocks a portion of the outer peripheral region of the light emitted from the lens; and a shade that is located on the opposite side of the second shading member from the lens and is configured to surround the second opening when viewed from the optical axis direction of the light source.

[0010] According to the present disclosure, it is possible to realize a lighting device that can suppress glare felt by the user and has an excellent appearance design.

[0011] FIG. 1 is a cross-sectional view of a lighting device according to an embodiment. FIG. 2 is a diagram for explaining the definition of a cross section in a cylindrical coordinate system. FIG. 3 is a cross-sectional view for explaining a specific structure of a lighting device according to an embodiment. FIG. 4 is a diagram for explaining a specific structure of a lighting device according to an embodiment. FIG. 5 is a diagram for explaining another example of a specific structure of a lighting device according to an embodiment. FIG. 6 is a diagram for explaining a method of assembling a lighting device according to Example 1. FIG. 7 is a diagram for explaining a method of assembling a lighting device according to Example 2. FIG. 8 is a diagram showing an installation example of a lighting device according to Example 3. FIG. 9 is a cross-sectional view of a lighting device according to Example 3. FIG. 10 is an external perspective view of a lighting device according to Example 3. FIG. 11 is a cross-sectional view of a lighting device according to Modification 1. FIG. 12 is a cross-sectional view of a lighting device according to Modification 2. FIG. 13 is a cross-sectional view of a lighting device according to Modification 3. FIG. 14 is a cross-sectional view of a lighting device according to Modification 4. FIG. 15 is a cross-sectional view of a lighting device according to Modification 5. FIG. 16 is a half cross-sectional view showing a modification of a shade.

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that each of the embodiments described below represents a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, 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. Therefore, among the components in the following embodiments, components that are not described in the independent claims that represent the highest concept of the present disclosure will be described as optional components.

[0013] The drawings are schematic diagrams and are not necessarily drawn to scale. Therefore, the scales of the drawings are not necessarily the same. In the drawings, the same reference numerals are used to denote substantially the same components, and redundant explanations will be omitted or simplified.

[0014] In this specification, the terms "up" and "down" do not refer to the upward direction (vertically upward) and downward direction (vertically downward) in absolute spatial recognition, but may be used as terms defined by relative positional relationships.

[0015] (Embodiment) First, the configuration of a lighting device 1 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view of the lighting device 1 according to the embodiment.

[0016] The cross section in Fig. 1 is a cross section at an arbitrary cross section S defined by the cross section definition of the cylindrical coordinate system shown in Fig. 2. Specifically, as shown in Fig. 2, if the optical axis direction of the light source 10 of the lighting device 1 is defined as the Z direction, the radial direction perpendicular to the optical axis is defined as the r direction, and the rotation direction around the optical axis is defined as the θ direction, then the arbitrary cross section S of the lighting device 1 is a cross section obtained by cutting the lighting device 1 along a plane passing through the optical axis.

[0017] 1 is, for example, a lighting fixture that emits illumination light. In this embodiment, the illumination device 1 is a spotlight that emits illumination light to a specific narrow area.

[0018] 1, the lighting device 1 includes a light source 10, a first light-blocking member 20, a lens 30, a second light-blocking member 40, a shade 50, and a housing 60. In this embodiment, there is only one lens 30.

[0019] The light source 10 is a light-emitting portion of the lighting device 1, and has a light exit surface 11 that emits light. The light exit surface 11 is perpendicular to the optical axis of the light source 10. The center point O of the light exit surface 11 is the light-emitting center of the light source 10. The optical axis of the light source 10 passes through the center point O of the light exit surface 11.

[0020] The light source 10 is an LED light source configured by LEDs (Light Emitting Diodes). Therefore, the light distribution of the light emitted from the light emitting surface 11 is a Lambertian light distribution. Specifically, the light distribution angle of the light emitted from the light emitting surface 11 is 120° at an arbitrary cross section S. In other words, the light emitted from the light emitting surface 11 is divergent light with a spread.

[0021] In this embodiment, the light source 10 is a packaged surface mount device (SMD) type LED element.

[0022] The light source 10, which is a surface-mounted LED element, includes a package (container) made of white resin with a recess, an LED chip primarily mounted on the bottom surface of the recess, and a sealing member encapsulated in the recess. The sealing member is made of a light-transmitting resin material such as silicone resin. The sealing member may also be a phosphor-containing resin that contains a wavelength conversion material such as a phosphor.

[0023] The LED chip is an example of a semiconductor light-emitting element that emits light using a predetermined DC power, and is a bare chip that emits monochromatic visible light. The LED chip is, for example, a blue LED chip that emits blue light when powered. In this case, in order to obtain white light, the sealing member contains a yellow phosphor such as YAG (yttrium aluminum garnet) that fluoresces using the blue light from the blue LED chip as excitation light.

[0024] The light source 10 configured in this manner is a BY type white LED light source composed of a blue LED chip and a yellow phosphor. Specifically, the yellow phosphor absorbs a portion of the blue light emitted by the blue LED chip, becomes excited, and emits yellow light. This yellow light mixes with the blue light not absorbed by the yellow phosphor to produce white light. Note that the sealing member may contain a red phosphor or a green phosphor in addition to the yellow phosphor.

[0025] 1, there is one light source 10, but this is not limiting. That is, there may be a plurality of light sources 10. In this case, a single light-emitting unit is configured by the plurality of light sources 10, and the center of the light-emitting unit becomes the optical axis.

[0026] The light emitted from the light source 10 serves as the illumination light for the lighting device 1. In the present embodiment, white light is emitted from the light source 10, and therefore the lighting device 1 emits white light as the illumination light. The color temperature range of the light emitted by the light source 10 is, for example, 3000 K to 7000 K, but is not limited thereto.

[0027] Although not shown, the light source 10 is mounted on a printed circuit board, which is a mounting substrate. The light source 10 and the mounting substrate constitute a light source module, and this light source module is fixed to the housing 60.

[0028] The light source 10 emits light using power supplied from a power supply circuit. The power supply circuit receives AC power and converts it into DC power at a predetermined level by rectifying, smoothing, stepping down, etc. The DC power generated by the power supply circuit is supplied to the light source 10, causing the light source 10 to emit light. The power supply circuit may, for example, constitute a constant current circuit, but the current supplied to the light source 10 may be limited by a constant voltage circuit and a resistor. The power supply circuit may be built into the lighting device 1, or may be installed separately from the lighting device 1 outside the lighting device 1.

[0029] A first light-blocking member 20, a lens 30, and a second light-blocking member 40 are arranged in this order on the light emission side of the light source 10. The first light-blocking member 20, the lens 30, and the second light-blocking member 40 are positioned on the optical axis of the light source 10.

[0030] The first light-blocking member 20 is disposed between the light source 10 and the lens 30. The first light-blocking member 20 is disposed opposite the light source 10 with a predetermined distance therebetween.

[0031] The first light-shielding member 20 has a first opening 21 through which a portion of the light emitted from the light source 10 passes, and a first light-shielding portion 22 that blocks a portion of the outer peripheral region of the light emitted from the light source 10. The first light-shielding member 20 is a flat light-shielding plate having the first opening 21.

[0032] The first opening 21 is provided at a position facing the light source 10 in the optical axis direction of the light source 10. The center of the first opening 21 coincides with the optical axis of the light source 10. The opening shape of the first opening 21 is circular.

[0033] The light emitted from the light source 10 in the Lambertian light distribution has its outer peripheral region shielded by the first light-shielding portion 22, and the remaining portion not shielded by the first light-shielding portion 22 passes through the first opening 21. In other words, only the inner peripheral region of the light emitted from the light source 10 passes through the first opening 21. Note that the first light-shielding member 20 may be configured so that most of the light emitted from the light source 10 passes through the first opening 21.

[0034] The first light-shielding member 20 also blocks stray light resulting from light emitted from the light source 10. For example, the first light-shielding member 20 blocks light (stray light) that is reflected by the inner wall of the housing 60 out of the light emitted from the light source 10. This makes it possible to prevent stray light generated in the space between the first light-shielding member 20 and the light source 10 from passing through the first opening 21 and entering the lens 30.

[0035] The first light-shielding member 20 (first light-shielding portion 22) may block light by absorbing it, or by specularly reflecting or diffusely reflecting it. However, from the viewpoint of suppressing stray light, it is preferable that the first light-shielding member 20 block light by absorbing it. In this case, the first light-shielding member 20 may be made of a light-absorbing material having a light transmittance of 10% or less, for example. The light-absorbing material may be a resin material or a metal material. In this embodiment, the light-absorbing material constituting the first light-shielding member 20 is a black resin material. This allows light that reaches the first light-shielding portion 22 of the first light-shielding member 20 to be efficiently absorbed and blocked.

[0036] The lens 30 is disposed between the first light-shielding member 20 and the second light-shielding member 40. The lens 30 is disposed at a predetermined distance from each of the first light-shielding member 20 and the second light-shielding member 40. The optical axis (lens axis) of the lens 30 coincides with the optical axis of the light source 10.

[0037] The lens 30 is a translucent optical member that controls the distribution of light incident thereon. In this embodiment, the light emitted from the light source 10 is incident on the lens 30, and therefore the lens 30 controls the distribution of light emitted from the light source 10.

[0038] The lens 30 is a condensing lens that condenses the light emitted from the light source 10. Specifically, the lens 30 condenses the light that is emitted from the light source 10 and passes through the first opening 21 of the first light-shielding member 20. The lens 30 is, for example, a convex lens.

[0039] Specifically, light passing through the central portion of lens 30 converges to become condensed light FL that forms a focal point FP. In this embodiment, focal point FP is the rear focal point located on the light emission side of lens 30. Focus FP is a cross point of control light controlled by lens 30. In other words, a cross point is formed in the ray trajectory of light emitted from lens 30. On the other hand, light passing through the peripheral portion of lens 30 is condensed to become parallel light.

[0040] The lens 30 is formed in a predetermined shape so as to have a predetermined lens function. The lens 30 is formed using a light-transmitting material. Specifically, the lens 30 is made of a transparent resin material such as acrylic or polycarbonate, or a transparent material such as glass.

[0041] The second light-blocking member 40 is disposed on the light-emitting side of the lens 30. The second light-blocking member 40 is disposed at a predetermined distance from the lens 30.

[0042] The second light-shielding member 40 has a second opening 41 through which a portion of the light emitted from the lens 30 passes, and a second light-shielding portion 42 that blocks a portion of the outer peripheral region of the light emitted from the lens 30. The second light-shielding member 40 is a flat light-shielding plate having the second opening 41.

[0043] The second opening 41 is provided at a position facing the lens 30 in the optical axis direction of the light source 10. The center of the second opening 41 coincides with the optical axis of the light source 10. Therefore, the center of the second opening 41 coincides with the center of the first opening 21 of the first light-shielding member 20 and also coincides with the center of the lens 30. The opening shape of the second opening 41 is circular.

[0044] The second light-blocking member 40 suppresses the spread of light emitted from the lens 30. In other words, the second light-blocking member 40 limits the spread angle of the light emitted from the lens 30.

[0045] Specifically, the light condensed by the lens 30 and emitted from the lens 30 has its outer peripheral region shielded by the second light-shielding portion 42, and the remaining portion not shielded by the second light-shielding portion 42 passes through the second opening 41. That is, only the inner peripheral region of the light emitted from the lens 30 passes through the second opening 41. For example, parallel light emitted from the peripheral portion of the lens 30 is shielded by the second light-shielding portion 42, and light emitted from the central portion of the lens 30 passes through the second opening 41 of the second light-shielding member 40 to become condensed light FL that reaches a focal point FP. In this embodiment, the focal point FP is located outside the second opening 41 (in the light traveling direction). Specifically, the focal point FP is located inside the shade 50.

[0046] In this way, the second light-blocking member 40 cuts off a portion of the light emitted from the lens 30, thereby limiting the spread angle of the light emitted from the lens 30. Note that the second light-blocking member 40 may be configured so that most of the light emitted from the lens 30 passes through the second opening 41.

[0047] The second light-shielding member 40 also blocks stray light resulting from light emitted from the lens 30. For example, the second light-shielding member 40 blocks light (stray light) that is reflected by the inner wall of the housing 60 out of the light emitted from the lens 30, and blocks stray light from outside the effective range of the lens 30. This makes it possible to prevent stray light generated in the space between the first light-shielding member 20 and the second light-shielding member 40 from passing through the second opening 41.

[0048] The light that has passed through the second opening 41 of the second light-shielding member 40 is irradiated in an arbitrary irradiation range onto an arbitrary light irradiation surface (light irradiation region) LS as illumination light of the lighting device 1. Therefore, the second opening 41 of the second light-shielding member 40 is a light exit portion of the lighting device 1.

[0049] Like the first light-shielding member 20, the second light-shielding member 40 may block light by absorbing it or by specularly or diffusely reflecting it. However, from the perspective of suppressing stray light, it is preferable that the second light-shielding member 40 block light by absorbing it, like the first light-shielding member 20. In this case, the second light-shielding member 40 may be made of a light-absorbing material having a light transmittance of 10% or less, for example. The light-absorbing material may be a resin material or a metal material. In this embodiment, the light-absorbing material constituting the second light-shielding member 40 is a black resin material. This allows light that reaches the second light-shielding portion 42 of the second light-shielding member 40 to be efficiently absorbed and blocked. The material of the second light-shielding member 40 is the same as the material of the first light-shielding member 20, but may also be different from the material of the first light-shielding member 20.

[0050] The shade 50 is located on the opposite side of the second light-blocking member 40 from the lens 30 side. The shade 50 is configured to surround the second opening 41 of the second light-blocking member 40 when viewed from the optical axis direction of the light source 10.

[0051] The shade 50 has a cylindrical body through which light that has passed through the second opening 41 of the second light-blocking member 40 passes. In the present embodiment, the shade 50 is cylindrical as a whole. The cylindrical shade 50 has a first opening 51 on the second light-blocking member 40 side and a second opening 52 on the opposite side to the first opening 51. Specifically, the shade 50 is cylindrical, and the first opening 51 and the second opening 52 each have a circular opening shape. Furthermore, the cylindrical axis of the shade 50 coincides with the optical axis of the light source 10.

[0052] The shade 50 is configured to make the second light-blocking member 40 less visible to the user. Specifically, the shade 50 is configured to make the second opening 41 of the second light-blocking member 40 (i.e., the light-emitting portion of the lighting device 1) and the light-emitting surface of the lens 30 (i.e., the lens light-emitting surface) less visible to the user. In the present embodiment, the shade 50 extends along the optical axis direction of the light source 10. As a result, the second opening 41 of the second light-blocking member 40 is located at a position recessed from the second opening 52 of the shade 50, making the second opening 41 of the second light-blocking member 40 less visible to the user. In other words, by recessing the second opening 41 of the second light-blocking member 40 (the light-emitting portion of the lighting device 1) with respect to the design surface of the lighting device 1, the second opening 41 and the light-emitting surface of the lens 30 (the lens light-emitting surface) become less noticeable.

[0053] In the present embodiment, the inner diameter of the shade 50 gradually increases with increasing distance from the second light-blocking member 40. Therefore, the opening diameter of the second opening 52 is larger than the opening diameter of the first opening 51. For this reason, as shown in FIG. 1 , the inner surface 50a of the shade 50 is an inclined surface, and the inner surface of the shade 50 is a cone-shaped portion. In this way, by gradually increasing the inner diameter of the shade 50 with increasing distance from the second light-blocking member 40, the second opening 41 of the second light-blocking member 40 can be made less visible. Furthermore, by adjusting the inclination angle of the inner surface 50a (inclined surface) of the shade 50, it is possible to make it more difficult for illumination light from the lighting device 1 to enter the user's eyes.

[0054] In the present embodiment, the shade 50 is configured so that light that has passed through the second opening 41 of the second light-blocking member 40 does not enter the inner surface 50a of the shade 50. In other words, the inner surface 50a (inclined surface) of the shade 50 is designed so that the condensed light (control light) of the lens 30, which is part of the light emitted from the light source 10 and has passed through the lens 30 and exited from the second opening 41 of the second light-blocking member 40, does not enter the inner surface 50a of the shade 50.

[0055] The diameter of the first opening 51 is the same as the diameter of the second opening 41 of the second light-shielding member 40. That is, the openings of the first opening 51 and the second opening 41 coincide with each other. In the present embodiment, the opening surface of the second opening 52 coincides with the opening surface of the opening 61 in the housing 60, but this is not limiting.

[0056] On the other hand, the outer diameter of the shade 50 is constant. Therefore, the thickness of the shade 50 gradually decreases with increasing distance from the second light-blocking member 40. The outer surface of the shade 50 is in contact with the inner surface of the housing 60.

[0057] In this embodiment, there is no gap between the shade 50 and the second light-blocking member 40, and the shade 50 is in close contact with the second light-blocking member 40. In this case, the shade 50 may be shaped to the second light-blocking member 40 and configured integrally with the second light-blocking member 40.

[0058] The shade 50 blocks light by absorbing it. In this case, the shade 50 may be made of a light-absorbing material having a light transmittance of 10% or less, for example. The light-absorbing material may be a resin material or a metal material. In this embodiment, the light-absorbing material constituting the shade 50 is a black resin material. This allows the light that reaches the shade 50 to be efficiently absorbed and blocked.

[0059] As described above, the shade 50 is designed so that the condensed light (control light) from the lens 30 does not enter the inner surface 50a of the shade 50, but stray light may reach the inner surface 50a of the shade 50. In this case, the stray light that reaches the inner surface 50a of the shade 50 can be absorbed and removed by the shade 50. This eliminates the reflection of light on the inner surface 50a of the shade 50, thereby preventing light caused by stray light from directly entering the user's eyes.

[0060] The housing 60 contains the light source 10, the first light-blocking member 20, the lens 30, the second light-blocking member 40, and the shade 50. That is, the light source 10, the first light-blocking member 20, the lens 30, the second light-blocking member 40, and the shade 50 are stored in the housing 60. The light source 10, the first light-blocking member 20, the lens 30, the second light-blocking member 40, and the shade 50 are fixed to the housing 60. The housing 60 is an outer member that forms the outer shell of the lighting device 1.

[0061] The housing 60 has an opening 61 through which light emitted from the lens 30 passes. Specifically, the housing 60 has a cylindrical body having the opening 61. The opening 61 is formed on the front end surface of the housing 60. In this embodiment, the housing 60 has a cylindrical shape with a bottom. Therefore, the opening shape of the opening 61 is circular. The cylindrical axis of the housing 60 and the optical axis of the light source 10 coincide with each other.

[0062] The housing 60 is made of a resin material, but may also be made of a metal material. The inner surface of the housing 60 is preferably black. This allows light incident on the inner surface of the housing 60 to be absorbed, thereby preventing stray light from emitting to the outside from the lighting device 1.

[0063] As described above, the lighting device 1 according to this embodiment includes the light source 10, the first shading member 20 having the first opening 21 through which a portion of the light emitted from the light source 10 passes and the first shading portion 22 that blocks a portion of the peripheral region of the light emitted from the light source 10, the lens 30 that collects the light that has passed through the first opening 21, the second shading member 40 having the second opening 41 through which a portion of the light emitted from the lens 30 passes and the second shading portion 42 that blocks a portion of the peripheral region of the light emitted from the lens 30, and the shade 50 that is located on the opposite side of the second shading member 40 from the lens 30 side and is configured to surround the second opening 41 when viewed from the optical axis direction of the light source 10.

[0064] In this way, by providing two light-blocking members, the first light-blocking member 20 and the second light-blocking member 40, and further providing a shade 50 on the light-exiting side of the second light-blocking member 40, it is possible to suppress stray light from the lighting device 1 and make the second opening 41 of the second light-blocking member 40 (the light-exiting portion of the lighting device 1) less visible to the user. In other words, the shade 50 sets the second opening 41 of the second light-blocking member 40 (the light-exiting portion of the lighting device 1) at a specified line-of-sight angle. This suppresses glare felt by the user, thereby achieving a glare-less lighting device 1. In other words, the shade 50 functions as a glare-less cone for achieving a glare-less lighting device. For example, when the lighting device 1 is installed in the passenger compartment of an automobile, as shown in FIG. 1 , passengers inside the passenger compartment cannot see the second opening 41 (the light-exiting portion) of the second light-blocking member 40. Furthermore, by providing the shade 50, the second opening 41 (light exit portion) of the second light-blocking member 40 can be recessed, so that the second opening 41 (light exit portion) and the light exit surface (lens light-emitting surface) of the lens 30 do not stand out unduly. In this way, the lighting device 1 according to the present embodiment can suppress glare felt by the user and can achieve a lighting device 1 with excellent external design.

[0065] Here, the specific structure (particularly the dimensional relationship) of the lighting device 1 will be described with reference to Fig. 3. Fig. 3 is a cross-sectional view for explaining the specific structure of the lighting device 1 according to the embodiment. Note that the cross section in Fig. 3 is a cross section at an arbitrary cross section S, similar to Fig. 1.

[0066] As shown in Figure 3, at an arbitrary cross section S of the lighting device 1, the width of the light emission surface 11 of the light source 10 is Wo, the opening width of the first opening 21 of the first light-shielding member 20 is W1, and the opening width of the second opening 41 of the second light-shielding member 40 is W2.

[0067] In this case, it is preferable that the relationship W1 ≥ W2 is satisfied, so that the spread of light that has passed through the first opening 21 of the first light-shielding member 20 and the lens 30 can be limited by the second opening 41 of the second light-shielding member 40.

[0068] Furthermore, it is preferable that the relationship W1≧Wo is satisfied, which can reduce unnecessary light emitted from the light source 10 from entering the space between the first light-shielding member 20 and the second light-shielding member 40 (the lens chamber in which the lens 30 is disposed).

[0069] 3 , the rear focal length of the lens 30 (the distance from the rear principal point LP of the lens 30 to the focal point FP) is denoted by fb, the distance from the focal point FP of the lens 30 to the light irradiation surface LS is denoted by xf, and the spread width of the illumination light from the illumination device 1 on the light irradiation surface LS is denoted by Df. This spread width Df is the spot diameter of the illumination light from the illumination device 1 (the illumination image perpendicular to the optical axis).

[0070] In this case, if the second light-shielding member 40 does not block the condensed light FL from the lens 30, it is preferable that the relationship fb / W1∽xf / Df or fb / W2∽xf / Df be satisfied. In other words, where a and b are constants, it is preferable that the relationship fb / W1=a×(xf / Df) or fb / W2=b×(xf / Df) be satisfied. This makes it possible to extract only the necessary condensed light FL from the lens 30 and project an image perpendicular to the optical axis onto the light-irradiated surface LS, regardless of the relative relationship between the position of the second light-shielding member 40 and the position of the focal point FP.

[0071] Furthermore, in an arbitrary cross section S of the lighting device 1 shown in Figure 3, the length of the light source 10 in the optical axis direction at the inner surface 21a of the first opening 21 of the first light-shielding member 20 is defined as t1, and the length of the light source 10 in the optical axis direction at the inner surface 41a of the second opening 41 of the second light-shielding member 40 is defined as t2.

[0072] In this case, it is preferable that at least one of the relationships 0<t1≦2 mm and 0<t2≦2 mm is satisfied. By satisfying the relationship 0<t1≦2 mm, it is possible to prevent stray light from being generated when light passing through the first opening 21 is reflected by the inner circumferential surface 21 a of the first opening 21. Similarly, by satisfying the relationship 0<t2≦2 mm, it is possible to prevent stray light from being generated when light passing through the second opening 41 is reflected by the inner circumferential surface 41 a of the second opening 41.

[0073] Furthermore, in an arbitrary cross section S of the lighting device 1 shown in Figure 3, the angle between the focused light FL of the lens 30 that has passed through the second opening 41 of the second light-shielding member 40 and the optical axis of the light source 10 is defined as θ1, the line connecting the edge point P1 of the second opening 41 of the second light-shielding member 40 and the edge point P2 of the ridge line Ls of the inner surface 50a of the shade 50 is defined as a straight line L1, and the angle between the straight line L1 and the optical axis of the light source 10 is defined as θ2.

[0074] In this case, it is preferable that the relationship θ2≧θ1 is satisfied, and that the ridge line Ls of the inner surface 50a of the shade 50 does not extend beyond the straight line L1 toward the optical axis. This prevents the condensed light FL of the lens 30 that has passed through the second opening 41 from entering the inner surface 50a of the shade 50. It is also preferable that the relationship θ2≧0° is satisfied. With this configuration, when the second light-blocking member 40 and the shade 50 are manufactured integrally by injection molding, the injection-molded product can be easily released from the mold.

[0075] 3 and 4 , if the distance from the rear principal point LP of the lens 30 to the second light-shielding member 40 in the optical axis direction of the light source 10 is x2, the angle θ1, the rear focal length fb, the opening width W2, and the distance x2 are preferably set to satisfy the relationship W2≦2|fb−x2|×tan θ1. This makes it possible to limit the spread of the light (condensed light FL) emitted from the lens 30 by the second opening 41 of the second light-shielding member 40, and also to prevent stray light generated inside the housing 60 from emitting from the second opening 41.

[0076] 5, the angle θ1, the rear focal length fb, the opening width W2, and the distance x2 may be set to satisfy the relationship W2>2×|fb−x2|×tan θ1. In this case, the spread of the light (collected light FL) emitted from the lens 30 is not limited by the second opening 41 of the second light-shielding member 40. However, there is a risk that stray light generated inside the housing 60 may be emitted from the second opening 41.

[0077] Here, a specific example of the lighting device 1 will be described below, including an assembly method.

[0078] 6A and 6B are diagrams for explaining a method of assembling the lighting device 100 according to Example 1. Fig. 6A shows the lighting device 100 before assembly, and Fig. 6B shows the lighting device 100 after assembly.

[0079] 6(a) and 6(b), the lighting device 100 includes a first component 101 including the light source 10, a second component 102 including the first light-blocking member 20, a third component 103 including the lens 30, a fourth component 104 including the second light-blocking member 40 and the shade 50, and a fifth component 105. The first component 101 includes the light source 10 and a substrate 12 on which the light source 10 is mounted. The fifth component 105 is a cover member.

[0080] As shown in FIG. 6A , when assembling the lighting device 100 , the fifth part 105 , the first part 101 , the second part 102 , the third part 103 and the fourth part 104 are aligned along the optical axis direction of the light source 10 .

[0081] Then, along the optical axis direction of the light source 10, the fifth part 105 and the fourth part 104 sandwich the first part 101, the second part 102, and the third part 103, thereby connecting the fifth part 105, the first part 101, the second part 102, the third part 103, and the fourth part 104.

[0082] At this time, the protrusion 103 a of the third part 103 is fitted into the recess 104 a of the fourth part 104. In addition, the leg portion 103 b of the third part 103 is inserted into the insertion hole 102 a of the second part 102 and the insertion hole 101 a of the first part 101, and the tip of the leg portion 103 b of the third part 103 is fitted into the recess 105 a of the fifth part 105.

[0083] 6B, the lighting device 100 can be obtained. At this time, the first part 101, the second part 102, and the third part 103 are sandwiched between the fifth part 105 and the fourth part 104 in the optical axis direction of the light source 10.

[0084] 6 can be used to easily assemble the lighting device 100. Furthermore, by assembling the lighting device 100 using the method shown in Fig. 6, the centers of the fifth part 105, the first part 101, the second part 102, the third part 103, and the fourth part 104 can be easily aligned with the optical axis of the light source 10.

[0085] 7 shows another embodiment. Fig. 7 is a diagram for explaining a method of assembling a lighting device 200 according to the second embodiment. Fig. 7(a) shows the lighting device 200 before assembly, and Fig. 7(b) shows the lighting device 200 after assembly.

[0086] As shown in (a) and (b) of Figures 7, the lighting device 200 includes a first part 201 including the light source 10, a second part 202 including a part of the first light-shielding member 20, the second light-shielding member 40, and the shade 50, a third part 203 including the lens 30, and a fourth part 204 including another part of the first light-shielding member 20.

[0087] As shown in FIG. 7A , when assembling the lighting device 200 , the first part 201 and the third part 203 are sandwiched between the second part 202 and the fourth part 204 in a direction perpendicular to the optical axis of the light source 10 .

[0088] Then, the second part 202 and the fourth part 204 sandwich the first part 201 and the third part 203 in a direction perpendicular to the optical axis of the light source 10, thereby connecting the second part 202, the first part 201, the third part 203 and the fourth part 204.

[0089] 7B, the lighting device 200 can be obtained. At this time, the first part 201 and the third part 203 are sandwiched between the second part 202 and the fourth part 204 in a direction perpendicular to the optical axis of the light source 10.

[0090] By using the method shown in Fig. 7, it is possible to easily assemble the lighting device 200. Furthermore, since the lighting device 200 shown in Fig. 7 has a smaller number of parts than the lighting device 100 shown in Fig. 6, by assembling the lighting device 200 by the method shown in Fig. 7, it is possible to assemble the lighting device 200 at low cost.

[0091] Next, another specific example of the lighting device 1 and an example of its use will be described with reference to Figs. 8 to 10. Fig. 8 is a diagram showing an installation example of the lighting device 300 according to Example 3. Fig. 9 is a cross-sectional view of the lighting device 300 according to Example 3. Fig. 10 is a perspective view showing the appearance of the lighting device 300 according to Example 3.

[0092] As shown in FIG. 8 , the lighting device 300 is installed in the passenger compartment of an automobile 2. That is, the lighting device 300 is a vehicle interior lighting device (vehicle interior lighting). In this embodiment, the lighting device 300 is installed on the ceiling 2a inside the passenger compartment. Furthermore, the illumination light from the lighting device 300 is irradiated onto a predetermined area of ​​the door trim 2b inside the passenger compartment. The lighting device 300 irradiates the illumination light obliquely toward the door trim 2b. Furthermore, the illumination light from the lighting device 300 has an elliptical light distribution and is conical light. Therefore, the illumination area illuminated by the illumination light from the lighting device 300 is elliptical.

[0093] As shown in FIGS. 9 and 10, the lighting device 300 includes a light source 10, a first light-blocking member 20, a lens 30, a second light-blocking member 40, a shade 50, and a housing 60.

[0094] Although the shapes of the light source 10, the first light-shielding member 20, the lens 30, the second light-shielding member 40, the shade 50, and the housing 60 are different between the lighting device 300 and the lighting device 1 in the above embodiment, the actions (functions) of the light source 10, the first light-shielding member 20, the lens 30, the second light-shielding member 40, the shade 50, and the housing 60 are the same between the lighting device 300 in this example and the lighting device 1 in the above embodiment.

[0095] The lighting device 300 of this embodiment is also a glareless lighting fixture, and is configured so that the light emitting portion of the lighting device 300 is not visible to passengers in the vehicle cabin.

[0096] (Modifications) Modifications of the lighting device 1 according to the embodiment will be described below.

[0097] (Modification 1) FIG. 11 is a cross-sectional view of an illumination device 1A according to Modification 1. As shown in FIG.

[0098] In the lighting device 1 of the above embodiment, the focus FP of the light emitted from the lens 30 is located on the side of the second light-shielding member 40 in the light propagation direction. However, as shown in FIG. 11 , in the lighting device 1A of this modified example, the focus FP of the light emitted from the lens 30 is located on the lens 30 side of the second light-shielding member 40.

[0099] In this case, if the rear focal length of the lens 30 is fb and the distance from the rear principal point LP of the lens 30 to the second light-blocking member 40 in the optical axis direction of the light source 10 is x2, the relationship fb≦x2 is satisfied. This makes it possible to prevent stray light generated inside the housing 60 from emitting from the second opening 41.

[0100] (Modification 2) FIG. 12 is a cross-sectional view of an illumination device 1B according to Modification 2. As shown in FIG.

[0101] 12 , lighting device 1B in this modification further includes a third light-shielding member 70 disposed between light source 10 and first light-shielding member 20, in addition to lighting device 1 in the above-described embodiment. Third light-shielding member 70 has a third opening 71 through which a portion of the light emitted from light source 10 passes.

[0102] By adding such a third light-blocking member 70 , stray light such as reflected light generated in front of the light emission surface 11 of the light source 10 can be blocked by the third light-blocking member 70 .

[0103] (Modification 3) FIG. 13 is a cross-sectional view of an illumination device 1C according to Modification 3. As shown in FIG.

[0104] 13 , in contrast to the lighting device 1 in the above embodiment, the lighting device 1C in this modification has a gap between the second light-shielding member 40 and the shade 50, and further includes a fourth light-shielding member 80 shaped on the portion of the shade 50 on the second light-shielding member 40 side. The fourth light-shielding member 80 has a fourth opening 81 through which light that has passed through the second opening 41 of the second light-shielding member 40 passes.

[0105] By adding such a fourth light-shielding member 80, all stray light that exists in the peripheral region beyond the focused light FL of the lens 30 that exits from the second opening 41 of the second light-shielding member 40 can be blocked by the fourth light-shielding member 80.

[0106] 13, the third light-shielding member 70 does not have to be provided. In other words, there may be only three light-shielding members: the first light-shielding member 20, the second light-shielding member 40, and the fourth light-shielding member 80.

[0107] (Modification 4) FIG. 14 is a cross-sectional view of an illumination device 1D according to Modification 4. As shown in FIG.

[0108] In the lighting device 1 of the above embodiment, the inner surface 21a of the first opening 21 of the first light-shielding member 20 is a vertical surface (a surface parallel to the optical axis of the light source 10), but as shown in Figure 14, in the lighting device 1D of this modified example, the inner surface 21a of the first opening 21D of the first light-shielding member 20D is an inclined surface.

[0109] When the inclination angle of the inner circumferential surface 21 a (inclined surface) of the first opening 21D is θa and the spread angle of the light emitted from the light source 10 is θc, the relationship θa ≧ θc is satisfied. This makes it possible to prevent stray light from being generated when light passing through the first opening 21D of the first light-blocking member 20D is reflected by the inner circumferential surface 21 a of the first opening 21D. As an example, when θc = 120°, θa = 130°.

[0110] (Modification 5) FIG. 15 is a cross-sectional view of an illumination device 1E according to Modification 5. As shown in FIG.

[0111] In the lighting device 1 of the above embodiment, the inner surface 41a of the second opening 41 of the second light-shielding member 40 is a vertical surface (a surface parallel to the optical axis of the light source 10), but as shown in Figure 15, in the lighting device 1E of this modified example, the inner surface 41a of the second opening 41E of the second light-shielding member 40E is an inclined surface.

[0112] If the inclination angle of the inner peripheral surface 41 a (inclined surface) of the second opening 41E is θb and the angle formed between the condensed light FL of the lens 30 that has passed through the second opening 41E and the optical axis of the light source 10 is θ1, then the relationship θb ≥ 2 × θ1 is satisfied. This makes it possible to prevent stray light from being generated when light passing through the second opening 41E of the second light-shielding member 40E is reflected by the inner peripheral surface 41 a of the second opening 41E.

[0113] Furthermore, in the above-described embodiment, the inner surface 50a of the shade 50 is an inclined surface, but this is not limited thereto. Specifically, as shown in FIG. 15 , the inner surface 50a of the shade 50E may be a vertical surface (a surface parallel to the optical axis of the light source 10). In other words, the inner diameter of the shade 50E may be constant. Specifically, the cross-sectional shape of the shade 50E shown in FIG. 15 is L-shaped. A shade 50E having such a shape can be applied to the above-described embodiment and other modified examples.

[0114] (Other Modifications) Although the lighting device according to the present disclosure has been described above based on the embodiment and modifications 1 to 5, the present disclosure is not limited to the embodiment and modifications 1 to 5.

[0115] For example, the shade 50 in the above embodiment has a flat inclined inner surface 50a as shown in FIG. 16(a). However, this is not limited to this. Specifically, the inner surface 50a may be a concave inclined surface as shown in FIG. 16(b) of the shade 50F, a convex inclined surface as shown in FIG. 16(c) of the shade 50G, or a stepped inclined surface as shown in FIG. 16(d) of the shade 50H. Furthermore, the inner surface 50a may be a partially recessed inclined surface as shown in FIG. 16(e) of the shade 50I. Specifically, the shade 50I shown in FIG. 16(e) has an L-shaped cross section as a whole, and only the first opening 51 and the second opening 52 are inclined surfaces. Note that FIGS. 16(a) to 16(e) show half cross sections of the shades 50 to 50I.

[0116] Furthermore, in the above embodiment and variants 1 to 5, the opening shape of the first opening 21 of the first light-shielding member 20 and the opening shape of the second opening 41 of the second light-shielding member 40 were both perfect circles, but this is not limited to this.

[0117] The opening shapes of the first opening 21 and the second opening 41 can be any shape depending on the desired light distribution of the illumination light emitted from the lighting device 1. Specifically, the opening shapes of the first opening 21 and the second opening 41 may be elliptical, polygonal such as rectangular, or star-shaped. In this case, the opening shapes of the first opening 21 and the second opening 41 may be elliptical with slits, or rectangular with slits and rounded corners. By making the opening shapes of the first opening 21 and the second opening 41 elliptical with the major axis direction aligned, the light distribution of the illumination light emitted from the lighting device 1 can be elliptical. Note that the opening shapes of the first opening 21 and the second opening 41 may be the same or different.

[0118] Furthermore, in the above-described embodiment and variations 1 to 5, the light source 10 is an SMD-type LED element, but this is not limited thereto. In other words, the light source module composed of the light source 10 and the mounting substrate is not limited to an SMD-type LED module. Specifically, the light source module may be a COB (chip-on-board) type LED module. In this case, the light source 10 includes an LED chip (bare chip) directly mounted on the mounting substrate and a sealing member that seals the LED chip. The LED chip may be one or more. When multiple LED chips are mounted on the substrate 12, the multiple LED chips may be collectively sealed with a sealing member or individually sealed. Furthermore, the sealing member may contain a wavelength conversion material such as a yellow phosphor, as described above.

[0119] Furthermore, in the above-described embodiment and variations 1 to 5, the light source 10 is a B-Y type white LED light source that emits white light using a blue LED chip and a yellow phosphor, but this is not limited thereto. For example, a phosphor-containing resin containing red and green phosphors may be used in combination with a blue LED chip to emit white light. Furthermore, in order to improve color rendering, red and green phosphors may be mixed in addition to the yellow phosphor. Furthermore, an LED chip that emits a color other than blue may be used. For example, an ultraviolet LED chip that emits ultraviolet light with a shorter wavelength than the blue light emitted by a blue LED chip may be used, and white light may be emitted using blue, green, and red phosphors that are excited mainly by the ultraviolet light to emit blue, red, and green light.

[0120] In the above-described embodiment and modifications 1 to 5, the light source 10 is configured by an LED, but this is not limiting. Specifically, the light source 10 may be configured by other solid-state light-emitting elements such as a semiconductor laser, an organic electroluminescence (EL) element, or an inorganic EL element.

[0121] Furthermore, in the above-described embodiment and modifications 1 to 5, the lighting device 1 is a spotlight, but this is not limiting and the lighting device 1 may be a lighting fixture other than a spotlight.

[0122] In the above-described embodiment and modifications 1 to 5, the lighting device 1 is installed in the cabin of an automobile vehicle, but this is not limiting. The lighting device 1 may also be installed in the cabin of a vehicle other than an automobile, such as a railway vehicle.

[0123] Furthermore, in the above-described embodiment and modifications 1 to 5, the lighting device 1 is an interior lighting device installed inside the vehicle cabin, but this is not limiting. The lighting device 1 may be installed in a location other than the interior of the vehicle. For example, the lighting device 1 may be installed on a construction material such as a ceiling or wall of a building such as a house or a store. The lighting device 1 may also be used as a light source device such as a backlight.

[0124] In addition, the present disclosure also includes forms obtained by applying various modifications that a person skilled in the art would conceive of to the above-described embodiment and Modifications 1 to 5, and forms realized by arbitrarily combining the components and functions of the above-described embodiment and Modifications 1 to 5 within the scope of the present disclosure. The present disclosure also includes any combination of one or more components in each of the multiple claims described in the claims at the time of filing. Furthermore, when a dependent claim described in the claims at the time of filing is made into a multiple claim or multiple multiple claim that cites any multiple claims (for example, when a multiple claim or multiple multiple claim is made so that each claim cites all of its parent claims), all forms obtained by combining all claims included in that multiple claim or multiple multiple claim are also included in the present disclosure.

[0125] REFERENCE SIGNS LIST 1, 1A, 1B, 1C, 1D, 1E, 100, 200, 300 Lighting device 2 Automobile 2a Ceiling 2b Door trim 10 Light source 11 Light exit surface 12 Substrate 20, 20D First light-blocking member 21, 21D First opening 21a Inner peripheral surface 22 First light-blocking portion 30 Lens 40, 40E Second light-blocking member 41, 41E Second opening 41a Inner peripheral surface 42 Second light-blocking portion 50, 50E, 50F, 50G, 50H, 50I Shade 50a Inner surface 51 First opening 52 Second opening 60 Housing 61 Opening 70 Third light-blocking member 71 Third opening 80 Fourth light-blocking member 81 Fourth opening 101, 201 First component 101a Insertion holes 102, 202 Second part 102a Insertion holes 103, 203 Third part 103a Protrusion 103b Legs 104, 204 Fourth part 104a Recess 105 Fifth part 105a Recess

Claims

1. A lighting device comprising: a light source having a light emission surface that emits light; a first light-shielding member having a first opening through which a portion of the light emitted from the light source passes and a first light-shielding portion that blocks a portion of the peripheral region of the light emitted from the light source; a lens that collects the light that has passed through the first opening; a second light-shielding member having a second opening through which a portion of the light emitted from the lens passes and a second light-shielding portion that blocks a portion of the peripheral region of the light emitted from the lens; and a shade located on the opposite side of the second light-shielding member from the lens, and configured to surround the second opening when viewed from the optical axis direction of the light source.

2. The lighting device according to claim 1, further comprising a third light-blocking member disposed between the light source and the first light-blocking member, the third light-blocking member having a third opening through which a portion of the light emitted from the light source passes.

3. The lighting device according to claim 1, wherein a gap is provided between the second light-blocking member and the shade, and a fourth light-blocking member is provided on the portion of the shade facing the second light-blocking member, and the fourth light-blocking member has a fourth opening through which light that has passed through the second opening passes.

4. The lighting device according to any one of claims 1 to 3, wherein the shade is configured so that light that has passed through the second opening does not enter the inner surface of the shade.

5. The lighting device according to any one of claims 1 to 3, wherein the relationship fb≦x2 is satisfied, where fb is the rear focal length of the lens and x2 is the distance from the rear principal point of the lens to the second light-blocking member in the optical axis direction of the light source.

6. The lighting device according to any one of claims 1 to 3, wherein, in any cross section of the lighting device, the relationship W2≦2|fb−x2|×tan θ1 is satisfied, where θ1 is the angle between the condensed light of the lens that has passed through the second opening and the optical axis of the light source, fb is the rear focal length of the lens, x2 is the distance from the rear principal point of the lens to the second light-blocking member in the optical axis direction of the light source, and W2 is the opening width of the second opening.

7. The lighting device according to any one of claims 1 to 3, wherein, in any cross section of the lighting device, the relationship W2 > 2 × |fb - x2 | × tan θ1 is satisfied, where θ1 is the angle between the condensed light of the lens that has passed through the second opening and the optical axis of the light source, fb is the rear focal length of the lens, x2 is the distance from the rear principal point of the lens to the second light-blocking member in the optical axis direction of the light source, and W2 is the opening width of the second opening.

8. The lighting device according to any one of claims 1 to 3, wherein, in any cross section of the lighting device, the angle formed between the condensed light of the lens that has passed through the second opening and the optical axis of the light source is θ1, the line connecting the edge point of the second opening and the edge point of the ridge line of the inner surface of the shade is straight line L1, and the angle formed between the straight line L1 and the optical axis of the light source satisfies the relationship θ2 ≧ θ1, and the ridge line of the inner surface of the shade does not protrude further towards the optical axis than the straight line L1.

9. The lighting device according to any one of claims 1 to 3, wherein, in any cross section of the lighting device, a line connecting an edge point of the second opening and an edge point of a ridge line on the inner surface of the shade is defined as a straight line L1, and an angle formed by the straight line L1 and the optical axis of the light source is defined as θ2, so that the relationship θ2 ≧ 0° is satisfied.

10. The lighting device according to any one of claims 1 to 3, wherein, in any cross section of the lighting device, the relationship W1 ≧ W2 is satisfied, where W1 is the opening width of the first opening and W2 is the opening width of the second opening.

11. The lighting device according to any one of claims 1 to 3, wherein, in any cross section of the lighting device, the relationship W1 ≧ Wo is satisfied, where Wo is the width of the light exit surface of the light source and W1 is the opening width of the first opening.

12. The lighting device according to any one of claims 1 to 3, comprising a first part including the light source, a second part including the first light-blocking member, a third part including the lens, a fourth part including the second light-blocking member and the shade, and a fifth part, wherein the first part, the second part, and the third part are sandwiched between the fifth part and the fourth part in the optical axis direction of the light source.

13. The lighting device described in any one of claims 1 to 3, comprising: a first part including the light source; a second part including a part of the first light-blocking member, the second light-blocking member, and the shade; a third part including the lens; and a fourth part including another part of the first light-blocking member, wherein the first part and the third part are sandwiched between the second part and the fourth part in a direction perpendicular to the optical axis of the light source.

14. The lighting device according to any one of claims 1 to 3, wherein the length of the light source in the optical axis direction on the inner circumferential surface of the first opening is t1, and the length of the light source in the optical axis direction on the inner circumferential surface of the second opening is t2, satisfying at least one of the relationships 0 < t1 ≦ 2 mm and 0 < t2 ≦ 2 mm.

15. The lighting device according to claim 14, wherein the inner peripheral surface of the first opening is an inclined surface, and the relationship θa ≧ θc is satisfied, where θa is the inclination angle of the inclined surface and θc is the spread angle of light emitted from the light source.

16. The lighting device according to claim 14, wherein the inner peripheral surface of the second opening is an inclined surface, and the relationship θb ≥ 2 × θ1 is satisfied, where θb is the inclination angle of the inclined surface and θ1 is the angle between the focused light of the lens that has passed through the second opening and the optical axis of the light source.

17. The lighting device according to any one of claims 1 to 3, wherein the illumination light emitted from the lighting device is irradiated onto an arbitrary light irradiation surface, the rear focal length of the lens is fb, the distance from the focal point of the lens to the light irradiation surface is xf, the opening width of the first opening is W1, and the spread width of the illumination light from the lighting device on the light irradiation surface is Df, and when the second light-shielding member does not block the condensed light of the lens, the relationship fb / W1 = a × (xf / Df) or fb / W2 = b × (xf / Df) is satisfied, where a and b are constants.

18. The lighting device according to any one of claims 1 to 3, wherein the lighting device is an interior lighting device installed in the interior of a vehicle.

Images