Display lamp

Abstract

A display lamp (1) includes a light source, a lens (4), and a cylindrical lamp cover (5). The light source includes a central LED (2A) and a pair of side LEDs (2B, 2C) arranged on an arrangement surface parallel to a central axis (C1) and having optical axes orthogonal to the arrangement surface. The lens includes a central lens portion (4A) and a pair of side lens portions (4B, 4C). The central lens portion emits light to a central emission reference line (L1) along a reference normal (BN) to the arrangement surface. The pair of side lens portions (2B, 2C) respectively emit light to a pair of side emission reference lines (L2, L3) respectively inclined at an inclination angle of 60° opposite to each other with respect to the central emission reference line (L1). The central lens portion includes a central light incident portion (32) having a central incident surface (31) for light from the central LED to be incident, and a plurality of central light guide portions (33) branched from the central light incident portion and extending toward the lamp cover. In each of the central light guide portions, light incident from a corresponding incident region of the central incident surface toward a corresponding central exit surface is refracted to be emitted from the corresponding central exit surface toward a corresponding region of the central emission reference line.

Description

TECHNICAL FIELD

[0001] The present application relates to a display lamp. BACKGROUND

[0002] In the light emitting device disclosed in Patent Literature 1, a substrate parallel to the central axis of a substantially cylindrical cover (a lamp cover) is surrounded by a lens. Light from two LEDs arranged on both sides of the substrate is radiated to the entire circumference via the lens. That is, one LED corresponds to a 180-degree radiation angle range.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: International Publication No. 2017 / 022143 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] According to the requirement for brighter light emission, a case where three LEDs arranged in a direction orthogonal to the central axis of a cylindrical lamp cover are used, and radiation light from each LED is radiated to a corresponding circumferential region of the lamp cover via a corresponding lens portion is assumed. The distance from the LED on the side close to the central axis to the lamp cover is longer than the distance from the LED on the side away from the central axis to the lamp cover. Therefore, a difference in light intensity occurs depending on the circumferential position of the lamp cover, and it can not be possible to emit light uniformly in the circumference.

[0008] An embodiment of the present application provides a display lamp capable of emitting light brightly and uniformly in the circumference.

[0009] MEANS FOR SOLVING PROBLEMS

[0010] An embodiment of the present application provides a display lamp which emits light in a radial direction away from a center axis toward the periphery of the center axis. The lens has a support member having a placement surface parallel with respect to the center axis, and a light source including a central LED and a pair of side LEDs, the central LED being placed on the placement surface with respect to a reference normal line passing through the center axis, having an optical axis orthogonal to the placement surface, the pair of side LEDs being placed equidistantly apart from the central LED with respect to both sides of the central LED, having optical axes orthogonal to the placement surface. In addition, the lens has a lens including a central lens portion and a pair of side lens portions, the central lens portion for the light from the central LED to be incident, and emitting the light from the central LED toward a radial angle range defined by a center angle centered on the center axis, i.e., a central radial angle range centered on a central light emission reference line along the reference normal line, the pair of side lens portions each having a side incident surface for the radial light from the corresponding side LED to be incident, and emitting the radial light from the corresponding side LED toward a pair of side radial angle ranges, the pair of side radial angle ranges each containing a pair of side light emission reference lines inclined with respect to the central light emission reference line on the orthogonal plane at an inclination angle of 60° in opposite directions. In addition, the lens has a lamp cover which surrounds the support member and the lens, is cylindrical or partially cylindrical centered on the center axis, and has a light-transmitting property. The central lens portion includes a central light incident portion having a central incident surface for the light from the central LED to be incident, and a plurality of central light guide portions branched from the central light incident portion in a dendritic manner, extending toward the lamp cover in the central radial angle range. Each of the central light guide portions includes a central exit end portion having a central exit surface which emits light toward the lamp cover in the central radial angle range. In each of the central light guide portions, the light incident from a corresponding incident region of the central incident surface toward the corresponding central exit surface is refracted from the corresponding central exit surface toward a corresponding region of the central radial angle range.

[0011] In the display lamp, light is emitted with high luminous intensity by using the central LED and the pair of side LEDs. On the other hand, since the distance from the central LED to the lamp cover is longer than the distance from the side LEDs to the lamp cover, the light intensity in the central angular range tends to be lower than the light intensity in the side angular range. Therefore, in the display lamp, the emitted light from the central LED is emitted to the central angular range by the central light guide portions only by refraction. Therefore, the optical path length from the central LED to the lamp cover can be shortened, and the optical path length from the central LED lens portion to the lamp cover can be made close to the optical path length from the side LEDs to the lamp cover. Thus, light can be emitted uniformly and brightly in the circumferential direction.

[0012] In one embodiment, the plurality of central light guide portions include a central main light guide portion and a pair of central sub light guide portions, the central main light guide portion contains the central light emission reference line and emits exit light parallel to the central light emission reference line, and the pair of central sub light guide portions are disposed on both sides of the central main light guide portion when viewed in parallel to the central axis and emit diffused exit light diffused in the circumferential direction of the lamp cover

[0013] In this embodiment, the emitted light from the central LED is emitted to the central angular range via the central lens portion. The central lens portion includes a plurality of central light guide portions branched from a central light incident portion, and the plurality of central light guide portions include a central main light guide portion and a pair of central sub light guide portions on both sides of the central main light guide portion. Therefore, in the central angular range, the light intensity can be improved, and light can be emitted uniformly in the circumferential direction.

[0014] In one embodiment, in the central angular range, a pair of regions corresponding to the pair of central sub light guide portions are disposed on both sides of a region corresponding to the central main light guide portion. In this embodiment, the emitted light from the central LED can be well distributed in the central angular range.

[0015] In one embodiment, the pair of central sub light guide portions include a pair of central near sub light guide portions and a pair of central far sub light guide portions, the pair of central near sub light guide portions are disposed on both sides of the central main light guide portion, the pair of central far sub light guide portions are disposed on both sides of the pair of central near sub light guide portions, and in the central angular range, a pair of regions corresponding to the pair of central far sub light guide portions are disposed on both sides of regions corresponding to the pair of central near sub light guide portions. In this embodiment, the pair of central sub light guide portions include the pair of central near sub light guide portions and the pair of central far sub light guide portions. Therefore, when viewed in parallel to the central axis, the thickness of each of the branched sub light guide portions can be uniformized, and moldability can be improved.

[0016] In one embodiment, each of the side lens portions includes a side light incident portion having the side incident surface for the light incident from the corresponding side LED, and a plurality of side light guide portions branching from the side light incident portion and extending toward the lamp cover side within the corresponding side radiation angle range, each of the side light guide portions including a side base end portion combined with the corresponding side light incident portion, a side exit end portion having a side exit surface for the light exiting toward the lamp cover side within the corresponding side radiation angle range, and a light guide reflection surface internally reflecting the light incident from the corresponding incident region of the corresponding side incident surface toward the side base end portion while guiding the light toward the side exit end portion.

[0017] In this embodiment, the radiation light from each side LED is radiated toward the corresponding side radiation angle range via the corresponding side lens portion. The light is guided by the internal reflection of the light guide reflection surface in each side light guide portion of each side lens portion. Therefore, the optical path length from each side LED to the lamp cover via the corresponding side lens portion can be lengthened, as a result of which the difference in the optical path length from the LED to the lamp cover can be reduced in the center and the side. Therefore, the light can be emitted uniformly in the circumferential direction.

[0018] In one embodiment, the plurality of side light guide portions includes a side main light guide portion containing the corresponding side light emission reference line and exiting the exit light parallel to the corresponding side light emission reference line, and a pair of side sub light guide portions disposed on both sides across the corresponding side main light guide portion when viewed parallel to the center axis and exiting the diffused exit light diffused in the circumferential direction of the lamp cover. In this embodiment, the radiation light from each side LED is well distributed in the corresponding side radiation angle range.

[0019] In one embodiment, the distance from the central LED to the central incident surface is longer than the distance from each side LED to the corresponding side incident surface, and the lens includes a pair of inclined connecting portions connecting the central light incident portion and each side light incident portion, respectively, and being inclined opposite to each other with respect to the arrangement surface when viewed parallel to the center axis. In this embodiment, the structure in which the distance from the LED to the lens portion (incident surface) is different in the center and the side can be realized in a practical structure.

[0020] In one embodiment, the central irradiation angle range occupied by the central incident surface in the irradiation angle range of light from the central LED and the side irradiation angle range occupied by the corresponding side incident surface in the irradiation angle range of light from each side LED are equal in size when viewed parallel to the central axis. In this embodiment, by making the central irradiation angle range corresponding to the central LED and the side irradiation angle range corresponding to each side LED equal in size, the light emitted from each LED can be effectively utilized to achieve uniform light emission in the circumferential direction.

[0021] In one embodiment, the support member includes a substrate having a pair of configuration surfaces on the front surface and the back surface that are opposite to each other, the light sources are arranged at positions that are linearly symmetrical with respect to a reference line that passes through the central axis and is parallel to the pair of configuration surfaces when viewed parallel to the central axis, and the lens is linearly symmetrical in shape with respect to the reference line. In this embodiment, a display lamp that achieves uniform light emission in all directions can be implemented with a practical structure.

[0022] In one embodiment, the central irradiation angle range and each side irradiation angle range are separated in the circumferential direction around the central axis. This embodiment can be suitable for a pseudo-rotating light.

[0023] In one embodiment, the lamp cover becomes a partial cylindrical shape with the configuration surfaces as the chord when viewed parallel to the central axis. This embodiment can be suitable for a display lamp that emits light uniformly with respect to a 180° range. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1A is a front view of a display lamp according to an embodiment of the present application, Figure 1B is an exploded perspective view of a display lamp.

[0025] Figure 2 is an enlarged exploded perspective view of a main part of a display lamp.

[0026] Figure 3A and Figure 3B are perspective views of a substrate at different angles from each other.

[0027] Figure 4 is a schematic cross-sectional view of a display lamp that shows the irradiation angle ranges of light from each LED.

[0028] Figure 5 is a schematic cross-sectional view of a display lamp that shows the light paths of light emitted from each LED.

[0029] Figure 6A is a perspective view of a lens, Figure 6B is a schematic view that shows the engaged state of a lens and a substrate.

[0030] Figure 7 It is a stereoscopic image of the lens from other angles.

[0031] Figure 8A This is the front view of the lens. Figure 8B This is a side view of the lens.

[0032] Figure 9A This is a top view of the lens. Figure 9B This is a bottom view of the lens.

[0033] Figure 10A This is a schematic diagram of the central LED and the central lens section. Figure 10B This is a schematic diagram showing the light path of the radiated light from the central LED, including the central LED and the central lens.

[0034] Figure 11A This is a schematic diagram showing the light path of the emitted light from one side LED, the side LED, and the side lens portion of one side LED. Figure 11B This is a schematic diagram showing the light path of the radiated light from the other side LED, the other side LED, and the other side lens portion.

[0035] Figure 12 This is a schematic cross-sectional view of the display lamps showing the radiation angle range of each light guide section.

[0036] Figure 13 This is a schematic cross-sectional view of an indicator lamp according to another embodiment of the present invention. Detailed Implementation

[0037] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0038] Figure 1A This is a front view of a display lamp 1 according to an embodiment of the present invention. Figure 1B This is an exploded 3D view of indicator light 1.

[0039] Reference Figure 1A as well as Figure 1B The indicator lamp 1 according to one embodiment of the present invention is used in manufacturing sites such as factories and is formed into an elongated cylindrical shape. The orientation of the indicator lamp 1 during use can be arbitrarily set according to the usage conditions. However, for convenience, it will be referred to below as... Figure 1A as well as Figure 1B The diagrams will be explained with reference to the vertical orientation of the paper and the length of the indicator light 1, using the vertically arranged indicator light 1 as a reference. Specifically, in Figure 1A as well as Figure 1B In the various diagrams, the top side of the paper is used as the top side of indicator light 1, and the bottom side of the paper is used as the bottom side of indicator light 1 for illustration.

[0040] Referring to Figure 1A and Figure 1B , the display lamp 1 has a plurality of display units DU, a base unit BU that supplies electric power to the plurality of display units DU, a pair of fixing shafts 10, and a top cover 11. In the display lamp 1, the plurality of display units DU are stacked in the up-down direction. The plurality of display units DU are fastened with respect to the base unit BU via the fixing shafts 10 that pass through the plurality of display units DU that are stacked. The top cover 11 is fitted to the upper end of the uppermost display unit DU.

[0041] The display lamp 1 becomes a cylindrical shape with a center axis C1 that extends in the up-down direction as a center. In the display lamp 1, each display unit DU emits light in a radial shape away from the center axis C1 toward the periphery of the center axis C1 (refer to Figure 5 ).

[0042] Figure 2 is an exploded perspective view of the display unit DU. As Figure 2 indicated, each display unit DU includes a substrate 3 on which a plurality of LEDs (Light Emitting Diodes) 2 as light sources are mounted, a lens 4, and a lamp cover 5. The LEDs 2 include a central LED 2A and side LEDs 2B, 2C.

[0043] The lamp cover 5 is formed in a cylindrical shape and is configured to contain the lens 4 (refer to Figure 4 as a cross-sectional view of the display lamp 1). The center axis C1 of the display lamp 1 corresponds to the center axis of the lamp cover 5. The lamp cover 5 is formed of a transparent (also including translucent, colored transparent) material, and transmits light from the LEDs 2 via the lens 4 to the periphery. As shown in the drawing, a lens cut portion that achieves circumferential diffusion of the radial light can also be formed on the lamp cover 5.

[0044] As Figure 2 indicated, the lamp cover 5 includes an upper end 5a in which the diameter is reduced to form a fitting convex portion, a lower end 5b that is an open end, and an end wall portion 5c that closes the inner side of the upper end 5a. The support hole 5d in which the upper end of the lens 4 is inserted and fitted to be supported and the insertion hole 5e in which each fixing shaft 10 is inserted are formed in the end wall portion 5c.

[0045] As Figure 1B indicated, the top cover 11 is a cylindrical container that is open downward. With respect to the lower end of the top cover 11, the upper end 5a of the lamp cover 5 of the uppermost display unit DU (refer to Figure 2 ) is inserted and fitted from below. In addition, in the display units DU adjacent in the up-down direction, the upper end 5a of the lamp cover 5 of the lower side display unit DU is inserted and fitted with respect to the lower end 5b of the lamp cover 5 of the upper side display unit DU.

[0046] As Figure 1BAs shown, the base unit BU has a cylindrical seat body 12. The seat body 12 includes an upper end 12a of which the diameter is reduced to form a fitting protrusion, a lower end 12b, and an end wall portion 12c that closes the inner side of the upper end 12a. The upper end 12a of the seat body 12 is inserted into the lower end 5b of the lamp cover 5 of the lowermost display unit DU to be fitted. A cylindrical boss 12d is formed to protrude from the end wall portion 12c. The boss 12d is inserted into the lower end of the lens 4 of the lowermost display unit DU combined with the base unit BU. In addition, a fixing hole 12e is formed in the end wall portion 12c for the lower end of the fixing shaft 10 to be inserted therethrough.

[0047] Next, the substrate 3 will be described.

[0048] Figure 3A and Figure 3B are perspective views of the substrate 3 at different angles from each other. As shown in Figure 3A and Figure 3B shown, the substrate 3 is a substantially rectangular thin plate having the first direction Z1 and the second direction Z2 as two sides, and is formed of a printed wiring board. The first direction Z1 is arranged to be parallel to the central axis C1.

[0049] A direction orthogonal to the first direction Z1 and the second direction Z2 becomes a thickness direction T of the substrate 3. The substrate 3 has a surface 3a that becomes both side surfaces in the thickness direction T and is parallel to the central axis C1, and a back surface 3b. The substrate 3 has a first end portion 3c of the first direction Z1 and a second end portion 3d. The first end portion 3c corresponds to the upper end portion, and the second end portion 3d corresponds to the lower end portion. In addition, the substrate 3 has a first end portion 3e of the second direction Z2 and a second end portion 3f.

[0050] On the substrate 3, a first connector 13 and a second connector 14 that are electrically connected to the substrate 3 of the display unit DU adjacent to the substrate 3 are provided. The first connector 13 and the second connector 14 are connected to the circuit formed on the printed wiring board, that is, the substrate 3. On the back surface 3b of the substrate 3, the first connector 13 is arranged at the first end portion 3c of the first direction Z1, and the second connector 14 is arranged at the second end portion 3d of the first direction Z1. The first connector 13 is connected to the second connector 14 of the substrate 3 of the display unit DU adjacent above. The second connector 14 is connected to the first connector 13 of the substrate 3 of the display unit DU adjacent below.

[0051] A pair of locking recesses 3g arranged separately in the first direction Z1 is formed at the first end portion 3e and the second end portion 3f of the second direction Z2 of the substrate 3.

[0052] A central LED 2A and a pair of side LEDs 2B, 2C as light sources are mounted on the surface 3a and the back surface 3b of the substrate 3, respectively. That is, the surface 3a and the back surface 3b of the substrate 3 constitute the arrangement surfaces of the LEDs 2, respectively. On the surface 3a, the central LED 2A and the pair of side LEDs 2B, 2C are arranged in the second direction Z2. The central LED 2A is arranged at the central position of the substrate 3 in the second direction Z2, and the pair of side LEDs 2B, 2C are arranged on both sides of the central LED 2A.

[0053] The central LED 2A of the surface 3a and the central LED 2A of the back surface 3b are located at the same position in the second direction Z2. In addition, each of the side LEDs 2B, 2C of the surface 3a and the corresponding side LEDs 2B, 2C of the back surface 3b are located at the same position in the second direction Z2.

[0054] In addition, on each of the surface 3a and the back surface 3b, the central LED 2A and the pair of side LEDs 2B, 2C arranged in the second direction Z2 form one group G. On the surface 3a and the back surface 3b, other groups G are arranged at intervals in the first direction Zl. In the illustrated example, two groups GA, GB are provided, but the number of groups G is not limited to this, and three or more groups G (not shown) can be provided, or only one group G (not shown) can be provided.

[0055] Hereinafter, when the central LED 2A and the side LEDs 2B, 2C are collectively referred to, they are simply referred to as LEDs 2.

[0056] The central LED 2A of the surface 3a and the back surface 3b has a common optical axis AX orthogonal to the surface 3a and the back surface 3b. The optical axis AX of the central LED 2A is arranged on a reference normal line BN passing through the central axis C1 with respect to the normal line of the surface 3a and the back surface 3b.

[0057] On the intersection K of the orthogonal plane PP including the reference normal line BN and orthogonal to the central axis C1 and the surface 3a (or the back surface 3b), the pair of side LEDs 2B, 2C of the surface 3a (or the back surface 3b) are arranged at equal distances from the central LED 2A on both sides of the central LED 2A with respect to the central LED 2A. The corresponding side LEDs 2B, 2C of the surface 3a and the back surface 3b have a common optical axis AX orthogonal to the surface 3a and the back surface 3b.

[0058] Next, the lens 4 will be described.

[0059] Figure 4 is a cross-sectional view of the display lamp 1 showing the range of the emission angle from each LED 2. Figure 5 is a cross-sectional view of the display lamp 1 showing the optical path of the emitted light from each LED 2. Figure 6A is a perspective view of the lens 4,Figure 6B is a schematic diagram showing the engaged state of the lens 4 and the substrate 3. Figure 7 is a perspective view of the lens 4 from another angle. Figure 8A is a front view of the lens 4, Figure 8B is a side view of the lens 4. Figure 9A is a plan view of the lens 4, Figure 9B is a bottom view of the lens 4.

[0060] As Figure 4 shown, the lens 4 is formed in a flat cylindrical shape that surrounds the substrate 3, and has a reference axis C2 (refer to Figure 2 ) disposed in line with the central axis C1 of the lamp cover 5. The lens 4 is formed of a transparent (including translucent or colored transparent) resin such as acrylic resin, using a metal mold by injection molding or the like.

[0061] Referring to Figure 4 , Figure 6A , Figure 7 , Figure 8A , Figure 8B , Figure 9A and Figure 9B , the lens 4 includes a main body portion 20 having an upper end 20a and a lower end 20b. The main body portion 20 includes a first portion 21 opposed to the surface 3a of the substrate 3, a second portion 22 opposed to the back surface 3b of the substrate 3, and a pair of connecting portions 23 connecting end portions of the first portion 21 and the second portion 22 to each other. In addition, the lens 4 includes a first linking portion 24 provided extending upward from the upper end 20a of the main body portion 20, and a second linking portion 25 provided extending downward from the lower end 20b of the main body portion 20.

[0062] As Figure 5 shown, when viewed parallel to the central axis C1, the central position between the surface 3a and the back surface 3b and the light source position Q of the central LED 2A is disposed in line with the central axis C1. That is, when viewed parallel to the central axis C1, the light sources (the central LED 2A and the side LEDs 2B, 2C) are disposed at positions (light source positions Q) symmetrical with respect to a reference line J passing through the central axis C1 and parallel to the surface 3a and the back surface 3b of the substrate 3, and the lens 4 is a line-symmetrical shape.

[0063] As Figure 8B shown, the first portion 21 and the second portion 22 each include two lens groups MA, MB (referred to simply as lens groups M when collectively referred to) corresponding to two groups GA, GB (refer to Figure 3A and Figure 3B ) of LEDs 2 of the surface 3a and the back surface 3b of the substrate 3, respectively.

[0064] As Figure 9A andFigure 9B As shown, each lens group M of the first part 21 and the second part 22 has a central lens part 4A, a pair of side lens parts 4B and 4C, and a pair of tilting connecting parts 4E and 4F.

[0065] like Figure 4 As shown, the distance D1 from the central LED 2A to the central incident surface 31 is longer than the distances D2 and D3 from each of the side LEDs 2B and 2C to their corresponding side incident surfaces 41 (D1 > D2, D1 > D3). The distances D2 and D3 from each of the side LEDs 2B and 2C to their corresponding side incident surfaces 41 are equal (D2 = D3). When viewed parallel to the central axis C1, the pair of inclined connecting portions 4E and 4F are inclined in opposite directions relative to the surface 3a (or back surface 3b) of the substrate 3.

[0066] Next, the connecting part 23 will be described.

[0067] like Figure 9A As shown, a pair of retaining grooves 26 extending in the vertical direction are formed on the inner side of a pair of connecting portions 23. The pair of retaining grooves 26 respectively fit into the first end portion 3e and the second end portion 3f of the second direction Z2 of the retaining substrate 3 (see reference). Figure 3B The substrate 3 is positioned and supported in the thickness direction T by means of a pair of inner wall surfaces 26a of each retaining groove 26. The substrate 3 is positioned and supported in the second direction Z2 by means of the bottom surfaces 26b of a pair of retaining grooves 26.

[0068] In addition, such as Figure 6A as well as Figure 6B As shown, a portion of the bottom surface 26b of each retaining groove 26 is formed by a cantilevered elastic locking piece 27 disposed on each connecting portion 23. Figure 6B As shown, the elastic locking piece 27 includes a groove bottom forming surface 27a that forms a part of the groove bottom surface 26b and a locking protrusion 27b disposed on the groove bottom forming surface 27a.

[0069] The substrate 3 is positioned and supported in the first direction Z1 and the second direction Z2 by the locking protrusion 27b of the elastic locking piece 27 elastically locking relative to the locking recess 3g of the first end 3e and the second end 3f in the second direction Z2 of the substrate 3.

[0070] Next, refer to Figure 6A , Figure 7 , Figure 8A , Figure 8B , Figure 9A as well as Figure 9B The first connecting part 24 and the second connecting part 25 will be described.

[0071] The first connecting portion 24 is provided extending upward from the upper end 20a of the main body portion 20 and is composed of a plurality of arc-shaped connecting pieces arranged on a circumference centered on the reference axis C2. Specifically, two sets of a central connecting piece 24a and a pair of side connecting pieces 24b arranged on both sides across the central connecting piece 24a are arranged in an opposite manner on the first portion 21 side and the second portion 22 side. The connecting pieces of the opposite sets are formed in a shape that is point-symmetrical to each other with respect to the reference axis C2.

[0072] The central connecting piece 24a includes a base end 24c joined to the upper end 20a of the main body portion 20, an extension provided end 24d, and an outward protrusion 24e protruding outward from the extension provided end 24d. The extension provided end 24d of the central connecting piece 24a is elastically flexible to deform inward with respect to the base end 24c. Thus, the outward protrusion 24e functions as an elastic hook that bridges the circumferential portion of the support hole 5d (see Figure 2 ) of the end wall portion 5c of the lamp cover 5.

[0073] The second connecting portion 25 is provided extending downward from the lower end 20b of the main body portion 20 and is composed of two arc-shaped connecting pieces 25a arranged on a circumference centered on the reference axis C2. The two connecting pieces 25a are arranged in an opposite manner on the first portion 21 side and the second portion 22 side.

[0074] When the multilayered lenses 4 are stacked, the two connecting pieces 25a of the second connecting portion 25 of the upper layer side lens 4 are respectively fitted inside the connecting pieces (the central connecting piece 24a and the pair of side connecting pieces 24b) of the two sets of the first connecting portion 24 of the lower layer side lens 4.

[0075] Next, the central lens portion 4A will be described with reference to Figure 4 , Figure 10A and Figure 10B .

[0076] The central lens portion 4A includes a central light incident portion 32 having a central incident surface 31 for light incident from the corresponding central LED 2A, and a plurality of central light guide portions 33 branching from the central light incident portion 32 in a dendritic manner to extend toward the lamp cover 5 side.

[0077] The central lens portion 4A is for light from the corresponding central LED 2A to be incident via the central incident surface 31 and emit light in a central emission angle range A1 centered on the central axis C1, which is defined by a central emission reference line L1 along the reference normal line BN.

[0078] Multiple central light guides 33 include a central dominant light guide 33A and a pair of central secondary light guides 33B and 33C. The central dominant light guide 33A contains a central light emission reference line L1 and emits parallel emitted light HL parallel to the central light emission reference line L1. When viewed parallel to the central axis C1, the pair of central secondary light guides 33B and 33C are arranged on both sides of the central dominant light guide 33A, emitting diffused emitted light KL that diffuses circumferentially towards the lamp cover 5.

[0079] A pair of central sub-light guides 33B and 33C include: a pair of centrally proximal sub-light guides 33D and 33E, disposed on both sides of the centrally dominant light guide 33A, and emitting diffused light KL; and a pair of centrally distant sub-light guides 33F and 33G, disposed on both sides of the pair of centrally proximal sub-light guides 33D and 33E, and emitting diffused light KL.

[0080] The central incident surface 31 includes incident areas corresponding to each central light guide 33. Specifically, the central incident surface 31 includes an incident area 31A corresponding to the central main light guide 33A, incident areas 31D and 31E corresponding to each central near secondary light guide 33D and 33E respectively, and incident areas 31F and 31G corresponding to each central far from secondary light guide 33F and 33G respectively.

[0081] like Figure 12 As shown, within the central radiation angle range A1, a pair of regions A1B and A1C corresponding to a pair of central sub-light guides 33B and 33C are arranged on both sides of a region A1A corresponding to a central dominant light guide 33A. Additionally, within the central radiation angle range A1, a pair of regions A1F and A1G corresponding to a pair of centrally distant sub-light guides 33F and 33G are arranged on both sides of a pair of regions A1D and A1E corresponding to a pair of centrally close sub-light guides 33D and 33E.

[0082] like Figure 10A as well as Figure 10B As shown, each light guide portion constituting the central light guide portion 33 (central main light guide portion 33A, central near secondary light guide portions 33D, 33E, and central far secondary light guide portions 33F, 33G) includes a central base end portion 34 that is combined with the central light incident portion 32 and a central emitting end portion 36 that has a central emitting surface 35 that emits light toward the lampshade 5.

[0083] like Figure 10BAs shown, in each light guide portion 33A, 33D, 33E, 33F, 33G of the central light guide portion 33, light that is refracted and incident from the respective corresponding incident regions 31A, 31D, 31E, 31F, 31G of the central incident surface 31 toward the corresponding central exit surface 35 is refracted and emitted from the corresponding central exit surface 35 toward the corresponding regions AlA, AlD, AlE, AlF, AlG (see FIG. 9) of the central emission angle range Al. That is, in each light guide portion 33A, 33D, 33E, 33F, 33G of the central light guide portion 33, light from the central LED 2A is guided and emitted only by refraction. Figure 12 ) being refracted and emitted from the central base end portion 34 or the vicinity thereof of the corresponding light guide portion 33D, 33E, 33F, 33G. The light of the portion that is not passed through the central exit surface 35 is also guided and emitted only by refraction.

[0084] The light that is refracted and incident from the central LED 2A to the incident regions 31D, 31E, 31F, 31G is not passed through the central exit surface 35 of the central exit end portion 36 of the corresponding light guide portion 33D, 33E, 33F, 33G, but is refracted and emitted from the central base end portion 34 or the vicinity thereof of the corresponding light guide portion 33D, 33E, 33F, 33G. The light of the portion that is not passed through the central exit surface 35 is also guided and emitted only by refraction.

[0085] In Figure 5 , the light path of the emitted light from the central LED 2A until the light is emitted from the lamp cover 5 via the central lens portion 4A is schematically shown by a double-dot chain line. In the central lens portion 4A, since each light guide portion guides light only by refraction, the light path length from the central LED 2A to the lamp cover 5 can be shortened.

[0086] The surface on the outer side of each light guide portion of the central light guide portion 33 (corresponding to the central exit surface 35) can also be formed as a Fresnel lens surface that realizes condensing in the up-down direction (a direction parallel to the central axis Cl) (see FIG. 9). Figure 6A

[0087] Next, the pair of side lens portions 4B, 4C will be described with reference to Figure 4 , Figure 11A and Figure 11B .

[0088] As Figure 4 ​As shown, when viewed parallel to the central axis C1, the pair of side lens sections 4B and 4C are linearly symmetrical with respect to the central light-emitting reference line L1. The pair of side lens sections 4B and 4C allow light from the corresponding side LEDs 2B and 2C to be incident through the side incident surface 41, and emit light into a pair of side radiation angle ranges A2 and A3. These side radiation angle ranges A2 and A3 each contain a pair of side light-emitting reference lines L2 and L3 that are tilted in opposite directions with an angle θ1 (θ1 = 60°) relative to the central light-emitting reference line L1. Each side radiation angle range A2 and A3 is defined by a central angle centered on the central axis C1.

[0089] The central angle of the central radiation angle range A1 and the central angles of each of the lateral radiation angle ranges A2 and A3 can be equal in size or different in size. The central angles of the central radiation angle range A1 and the lateral radiation angle ranges A2 and A3 are sometimes set to a predetermined angle within the range of 55° to 65°, and sometimes to a predetermined angle within the range of 50° to 70°. Furthermore, the central radiation angle range A1 and the lateral radiation angle ranges A2 and A3 can be circumferentially separated from each other on the inner surface of the lampshade 5, or they can partially overlap each other on the inner surface of the lampshade 5. Specifically, in the case where the central radiation angle range A1 and the lateral radiation angle ranges A2 and A3 are circumferentially separated on the inner surface of the lampshade 5, there is a case where the central angle of the central radiation angle range A1 is 70°, and the central angles of each of the lateral radiation angle ranges A2 and A3 are 55°.

[0090] like Figure 11A as well as Figure 11B As shown, each side lens portion 4B, 4C includes: a side light incident portion 42 having a side incident surface 41 for light from the corresponding side LEDs 2B, 2C to be incident; and a plurality of side light guide portions 43 branching from the side light incident portion 42 and extending toward the lampshade 5.

[0091] When observed parallel to the central axis C1, the illumination angle range occupied by the central incident surface 31 within the illumination angle range of the light from the central LED2A is the central illumination angle range QA (refer to...). Figure 10B The side illumination angle ranges QB and QC are the ranges of illumination from the light source (equivalent to the central angle range centered on the light source position Q) and the illumination angle ranges from each of the side LEDs 2B and 2C, respectively, and are corresponding to the side incident surface 41. Figure 11A , Figure 11B (This is equivalent to the range of the central angle centered on the light source position Q being equal in size.)

[0092] However, sometimes, one of the central illumination angle range QA and the side illumination angle ranges QB and QC is set to a specified size within the range of 90% to 110% of the other. In addition, sometimes, one is set to a specified size within the range of 95% to 105% of the other.

[0093] like Figure 11A As shown, the side lens section 4B of one side includes multiple side light guides 43, including a side dominant light guide 43A and a pair of side auxiliary light guides 43B and 43C. The side dominant light guide 43A contains a corresponding side emission reference line L2 and emits parallel emitted light HL that is parallel to the corresponding side emission reference line L2. When viewed parallel to the central axis C1, the pair of side auxiliary light guides 43B and 43C are arranged on both sides separated by the corresponding side dominant light guide 43A, emitting diffused emitted light KL that diffuses circumferentially towards the lamp cover 5.

[0094] like Figure 12 As shown, within the lateral radiation angle range A2, there is a pair of lateral sub-light guides 43B and 43C (refer to...). Figure 11A The corresponding pair of regions A2B and A2C are arranged on both sides of region A1A, which is separated from the side dominant light part 43A.

[0095] like Figure 11B As shown, the other side lens section 4C has multiple side light guides 43, including a side dominant light guide 43D and a pair of side auxiliary light guides 43E and 43F. The side dominant light guide 43D contains a corresponding side emission reference line L3 and emits parallel emitted light HL that is parallel to the corresponding side emission reference line L3. When viewed parallel to the central axis C1, the pair of side auxiliary light guides 43E and 43F are arranged on both sides separated by the corresponding side dominant light guide 43D, emitting diffused emitted light KL that diffuses circumferentially towards the lampshade 5.

[0096] like Figure 12 As shown, within the lateral radiation angle range A3, there is a pair of lateral sub-light guides 43E and 43F (refer to...). Figure 11B The corresponding pair of regions A3E and A3F are arranged on both sides of region A3D, which corresponds to the side dominant light part 43D.

[0097] like Figure 11A as well as Figure 11B As shown, each side light guide portion 43 (43A to 43F) includes a side base end portion 44, a side emission end portion 45, and a light guide reflective surface 46. The side base end portion 44 is combined with the side light incident portion 42. The side emission end portion 45 has a side emission surface 47 that emits light toward the lamp cover 5.

[0098] The light-reflecting surface 46 internally reflects the light incident to the side base end portion 44 from the corresponding incident regions 41A, 41B, 41C, 41D, 41E, 41F of the corresponding side incident surfaces 41 and guides the light to the side exit end portion 45. The light-reflecting surface 46 is an internal reflecting surface provided to the back surface of the outer side surface of each side light guide portion 43 (43A to 43F) on the center axis C1 side.

[0099] In Figure 5 , the broken lines schematically show the light paths of the radiated light from the side LEDs 2B, 2C until the light is emitted from the lamp cover 5 via the corresponding side lens portions 4B, 4C. In each side lens portion 4B, 4C, each light guide portion guides the light by reflection, and thus the light path length from each side LED 2B, 2C to the lamp cover 5 can be extended.

[0100] The outer side surface of each light guide portion of the side light guide portion 43 (corresponding to the side exit surface 47) can also be formed as a Fresnel lens surface that realizes condensing in the up-down direction (the direction parallel to the center axis C1) (see Figure 6A ).

[0101] The display lamp 1 of the present embodiment has the following effects.

[0102] That is, as Figure 4 indicated, by using the central LED 2A and the pair of side LEDs 2B, 2C, high-intensity light emission can be achieved. On the other hand, the distance from the central LED 2A to the lamp cover 5 is longer than the distance from the side LEDs 2B, 2C to the cylindrical lamp cover 5, and thus the light intensity of the central radiation angle range A1 tends to be lower than the light intensity of the side radiation angle ranges A2, A3. Therefore, in the display lamp 1, the radiated light from the central LED 2A is radiated to the central radiation angle range A1 by each central light guide portion 33 only by refraction (see Figure 5 and Figure 10B ). Thus, the light path length from the central LED 2A to the lamp cover 5 can be shortened, and the light path length from the central LED 2A to the lamp cover 5 can be made close to the light path length from the side LEDs 2B, 2C to the lamp cover 5. Thereby, uniform and bright light emission in the circumferential direction can be achieved.

[0103] In addition, as Figure 4 and Figure 10A indicated, the radiated light from the central LED 2A is radiated to the central radiation angle range A1 via the central lens portion 4A. The central lens portion 4A includes the plurality of central light guide portions 33 branched in a tree shape from the central light incident portion 32, and the plurality of central light guide portions 33 include the central main light guide portion 33A and the pair of central sub light guide portions 33B, 33C on both sides of the central main light guide portion 33A. Thus, within the central radiation angle range A1, the light intensity can be increased, and uniform light emission in the circumferential direction can be achieved.

[0104] As Figure 4 and Figure 12 illustrated, within the central radiation angle range Al, a pair of regions AlB, AlC corresponding to the pair of central sub light guide portions 33B, 33C are disposed on both sides across the region AlA corresponding to the central main light guide portion 33A. Therefore, the radiation light from the central LED 2A is well distributed in the central radiation angle range Al.

[0105] In addition, the pair of central sub light guide portions 33B, 33C includes a pair of central near sub light guide portions 33D, 33E and a pair of central far sub light guide portions 33F, 33G. Therefore, when viewed parallel to the central axis Cl, it is possible to homogenize the thickness of each of the branched sub light guide portions 33D, 33E, 33F, 33G, and it is possible to improve moldability.

[0106] In addition, as Figure 4 illustrated, the radiation light from each of the side LEDs 2B, 2C is radiated to the corresponding side radiation angle range A2, A3 via the corresponding side lens portion 4B, 4C. In addition, as Figure 11A and Figure 11B illustrated, each of the side light guide portions 43 of each of the side lens portions 4B, 4C guides light using internal reflection of the light guide reflection surface 46. Therefore, as Figure 5 illustrated, it is possible to lengthen the optical path length from each of the side LEDs 2B, 2C to the lamp cover 5 via the corresponding side lens portion 4B, 4C. As a result, with respect to the optical path length from the LED 2 to the lamp cover 5, it is possible to reduce the difference in the optical path length between the center and the side. Therefore, it will be possible to emit light uniformly in the circumferential direction.

[0107] In addition, as Figure 11A and Figure 11B illustrated, the side light guide portion 43 of each of the side lens portions 4B, 4C includes a side main light guide portion 43A, 43D that exits parallel exit light HL parallel to the corresponding side light emission reference line L2, L3, and a pair of side sub light guide portions 43B, 43C; 43E, 43F disposed on both sides across the corresponding side main light guide portion 43A, 43D that exit diffused exit light KL diffused in the circumferential direction of the lamp cover 5. Therefore, as Figure 5 illustrated, the radiation light from each of the side LEDs 2B, 2C is well distributed in the corresponding side radiation angle range A2, A3.

[0108] In addition, as Figure 4As shown, the distance D1 from the central LED 2A to the central incident surface 31 is longer than the distances D2 and D3 from each of the side LEDs 2B and 2C to their corresponding side incident surfaces 41. When viewed parallel to the central axis C1, the lens 4 includes a pair of inclined connecting portions 4E and 4F, which connect the central light incident portion 32 and each of the side light incident portions 42, respectively, and are inclined in opposite directions relative to the mounting surface (surface 3a or back surface 3b). Therefore, it is possible to integrally form a structure in which the distances from each of the LEDs 2A, 2B, and 2C to their corresponding lens portions 4A, 4B, and 4C (incident surfaces 31 and 41) are different in the center and on the sides. In addition, a portion of the mounting components of the mounting substrate 3, such as connectors 13 and 14, can be accommodated between the central lens portion 4A and the substrate 3.

[0109] Additionally, by adjusting the central illumination angle range QA corresponding to the central LED2A (refer to...) Figure 10B ) and the lateral illumination angle ranges QB and QC corresponding to each side LED 2B and 2C (refer to Figure 11A as well as Figure 11B The LEDs are of equal size and can effectively utilize the radiated light from each LED 2A, 2B, and 2C to achieve uniform circumferential light emission. This is especially effective when the distance D1 from the central LED 2A to the central incident surface 31 is longer than the distances D2 and D3 from each side LED 2B and 2C to the corresponding side incident surface 41.

[0110] In addition, such as Figure 5 As shown, when viewed parallel to the central axis C1, the light source (LED2) is positioned symmetrically with respect to the reference line J, which passes through the central axis C1 and is parallel to a pair of configuration surfaces (surface 3a and back surface 3b). Furthermore, the lens 4 has a shape symmetrical with respect to the reference line J. Therefore, a display lamp 1 that emits light uniformly in all directions can be realized with a practical structure.

[0111] In addition, such as Figure 12 As shown, when the central radiation angle range A1 and the side radiation angle ranges A2 and A3 are separated circumferentially around the central axis C1, a pseudo-rotating lamp is suitable for controlling the sequential lighting and extinguishing of adjacent LEDs 2 in the circumferential direction of the central axis C1.

[0112] Figure 13 This is a schematic cross-sectional view of the display lamp 1 according to another embodiment of the present invention. (See attached image.) Figure 13 As shown, when viewed parallel to the central axis C1, the lampshade 5 becomes a partially cylindrical shape with the surface 3a (configuration surface) of the substrate 3 as a chord. This embodiment is suitable for use as an indicator lamp that emits light uniformly over a 180° range.

[0113] The present application is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

[0114] Explanation of Reference Signs

[0115] 1: display lamp,

[0116] 2: LED (light source),

[0117] 2A: central LED,

[0118] 2B: side LED,

[0119] 2C: side LED,

[0120] 3: substrate (support member),

[0121] 3a: surface (arrangement surface),

[0122] 3b: back surface (arrangement surface),

[0123] 4: lens,

[0124] 4A: central lens portion,

[0125] 4B: side lens portion,

[0126] 4C: side lens portion,

[0127] 4E: inclined connecting portion,

[0128] 4F: inclined connecting portion,

[0129] 5: lamp cover,

[0130] 13: first connector,

[0131] 14: second connector,

[0132] 20: main body portion,

[0133] 21: first portion,

[0134] 22: second portion,

[0135] 23: connecting portion,

[0136] 24: first linking portion,

[0137] 25: second linking portion,

[0138] 31: central incident surface,

[0139] 31A, 31D, 31E, 31F, 31G: incident region,

[0140] 32: central light incident portion,

[0141] 33: central light guide portion,

[0142] 33A: central main light guide portion,

[0143] 33B: central sub light guide portion,

[0144] 33C: central sub light guide portion,

[0145] 33D: central proximal sub light guide portion,

[0146] 33E: central proximal sub light guide portion,

[0147] 33F: central distal sub light guide portion,

[0148] 33G: central distal sub light guide portion,

[0149] 35: central exit surface,

[0150] 36: central exit end portion,

[0151] 41: side surface,

[0152] 41A, 41B, 41C, 41D, 41E, 41F: incident region,

[0153] 42: side light incident portion,

[0154] 43: side light guide portion,

[0155] 43A: side main light guide portion,

[0156] 43B: side sub light guide portion,

[0157] 43C: side sub light guide portion,

[0158] 43D: side main light guide portion,

[0159] 43E: side sub light guide portion,

[0160] 43F: side sub light guide portion,

[0161] 45: side exit end portion,

[0162] 46: light guide reflection surface,

[0163] 47: side exit surface,

[0164] A1: central radiation angle range,

[0165] A1A, A1B, A1C, A1D, A1E, A1F, A1G: region,

[0166] A2: side radiation angle range,

[0167] A2A, A2B, A2C: regions,

[0168] A3: lateral radiation angle range,

[0169] A3D, A3E, A3F: regions,

[0170] AX: optical axis,

[0171] BN: reference normal line,

[0172] BU: base unit,

[0173] C1: central axis,

[0174] D1, D2, D3: distances,

[0175] DU: display unit,

[0176] J: reference line,

[0177] K: intersection,

[0178] L1: central light emission reference line,

[0179] L2: lateral light emission reference line,

[0180] L3: lateral light emission reference line,

[0181] PP: orthogonal plane,

[0182] Q: light source position,

[0183] QA: central radiation angle range,

[0184] QB: lateral radiation angle range,

[0185] QC: lateral radiation angle range,

[0186] θ1: inclination angle.

Claims

1. A display lamp which emits light in a radial manner away from a central axis toward the periphery of the central axis, wherein, having: a support member having a configuration surface parallel with respect to the center axis, a light source including a central LED and a pair of side LEDs, the central LED being configured on the configuration surface on a reference normal line passing through the center axis with respect to a normal line of the configuration surface, having an optical axis orthogonal to the configuration surface, the pair of side LEDs being configured on an intersection of an orthogonal plane including the reference normal line and orthogonal to the center axis and the configuration surface, being configured equidistantly apart from the central LED on both sides across the central LED, having an optical axis orthogonal to the configuration surface, a lens including a central lens portion and a pair of side lens portions, the central lens portion being for the light from the central LED to be incident and causing the light from the central LED to emit toward a radiation angle range defined by a center angle centered on the center axis, that is, a central radiation angle range centered on a central light emission reference line along the reference normal line, the pair of side lens portions each having a side incident surface for the radiation light from the corresponding side LED to be incident and causing the radiation light from the corresponding side LED to emit toward a pair of side radiation angle ranges, the pair of side radiation angle ranges each containing a pair of side light emission reference lines inclined to each other in an inclined angle of 60° with respect to the central light emission reference line on the orthogonal plane, a lamp cover surrounding the support member and the lens, being cylindrical or partially cylindrical centered on the center axis, and having a light-transmissive property; the central lens portion including a central light incident portion having a central incident surface for the light from the central LED to be incident and a plurality of central light guide portions branched from the central light incident portion in a dendritic manner, extending toward the lamp cover in the central radiation angle range, each of the central light guide portions including a central exit end portion having a central exit surface for the light to exit toward the lamp cover in the central radiation angle range, in each of the central light guide portions, the light refracted to be incident from a corresponding incident region of the central incident surface toward a corresponding central exit surface is refracted to be emitted from the corresponding central exit surface toward a corresponding region of the central radiation angle range.

2. The display lamp according to claim 1, wherein the plurality of central light guide portions include a central main light guide portion containing the central light emission reference line and emitting exit light parallel with the central light emission reference line, and a pair of central sub light guide portions configured on both sides across the central main light guide portion when viewed parallel to the center axis and emitting diffused exit light diffused toward a circumference of the lamp cover.

3. The display lamp according to claim 2, wherein in the central radiation angle range, a pair of regions corresponding to the pair of central sub light guide portions are configured on both sides across a region corresponding to the central main light guide portion.

4. The display lamp according to claim 3, wherein The pair of central sub light guide portions includes a pair of central near sub light guide portions and a pair of central far sub light guide portions, the pair of central near sub light guide portions are arranged on both sides across the central main light guide portion, and the pair of central far sub light guide portions are arranged on both sides across the pair of central near sub light guide portions, In the central emission angle range, a pair of regions corresponding to the pair of central far sub light guide portions are arranged on both sides across regions corresponding to the pair of central near sub light guide portions.

5. The display lamp according to any one of claims 1 to 4, wherein Each of the side lens portions includes a side light incident portion having the side incident surface for the light incident from the corresponding side LED, and a plurality of side light guide portions branched from the side light incident portion and extending toward the lamp shade side in the corresponding side emission angle range, Each of the side light guide portions includes a side base end portion combined with the corresponding side light incident portion, a side exit end portion having a side exit surface for the light to exit toward the lamp shade side in the corresponding side emission angle range, and a light guide reflection surface for internally reflecting the light incident from the corresponding incident region of the corresponding side incident surface toward the side base end portion and guiding the light toward the side exit end portion.

6. The display lamp according to claim 5, wherein The plurality of side light guide portions include a side main light guide portion containing the corresponding side light emission reference line and exiting the exit light parallel to the corresponding side light emission reference line, and a pair of side sub light guide portions arranged on both sides across the corresponding side main light guide portion when viewed parallel to the central axis and exiting the diffused exit light diffused toward the circumferential direction of the lamp shade.

7. The display lamp according to claim 5, wherein The distance from the central LED to the central incident surface is longer than the distance from each of the side LEDs to the corresponding side incident surface, The lens includes a pair of inclined connection portions respectively connecting the central light incident portion and each of the side light incident portions and being inclined opposite to each other with respect to the arrangement surface when viewed parallel to the central axis.

8. The display lamp according to claim 6, wherein The distance from the central LED to the central incident surface is longer than the distance from each of the side LEDs to the corresponding side incident surface, The lens includes a pair of inclined connection portions respectively connecting the central light incident portion and each of the side light incident portions and being inclined opposite to each other with respect to the arrangement surface when viewed parallel to the central axis.

9. The display lamp according to claim 5, wherein The central irradiation angle range in which the central incident surface occupies in the irradiation angle range of light from the central LED and the side irradiation angle range in which the corresponding side incident surface occupies in the irradiation angle range of light from each of the side LEDs are equal in size when viewed parallel to the central axis.

10. The display lamp according to any one of claims 6 to 8, wherein The central irradiation angle range in which the central incident surface occupies in the irradiation angle range of light from the central LED and the side irradiation angle range in which the corresponding side incident surface occupies in the irradiation angle range of light from each of the side LEDs are equal in size when viewed parallel to the central axis.

11. The display lamp according to any one of claims 1 to 4, 6 to 9, wherein The support member includes a substrate having a pair of arrangement surfaces opposite to each other on a front surface and a back surface, The light source is arranged in a line-symmetrical position with respect to a reference line passing through the central axis and parallel to the pair of arrangement surfaces when viewed parallel to the central axis, and the lens is a line-symmetrical shape with respect to the reference line.

12. The display lamp according to claim 5, wherein The support member includes a substrate having a pair of arrangement surfaces opposite to each other on a front surface and a back surface, The light source is arranged in a line-symmetrical position with respect to a reference line passing through the central axis and parallel to the pair of arrangement surfaces when viewed parallel to the central axis, and the lens is a line-symmetrical shape with respect to the reference line.

13. The display lamp according to claim 10, wherein The support member includes a substrate having a pair of arrangement surfaces opposite to each other on a front surface and a back surface, The light source is arranged in a line-symmetrical position with respect to a reference line passing through the central axis and parallel to the pair of arrangement surfaces when viewed parallel to the central axis, and the lens is a line-symmetrical shape with respect to the reference line.

14. The display lamp according to any one of claims 1 to 4, 6 to 9, 12, 13, wherein The central radiation angle range and each of the side radiation angle ranges are separated circumferentially around the central axis.

15. The display lamp according to claim 5, wherein The central radiation angle range and each of the side radiation angle ranges are separated circumferentially around the central axis.

16. The display lamp according to claim 10, wherein The central radiation angle range and each of the side radiation angle ranges are separated circumferentially around the central axis.

17. The display lamp according to claim 11, wherein The central radiation angle range and each of the side radiation angle ranges are separated circumferentially around the central axis.

18. The display lamp according to any one of claims 1 to 4, 6 to 9, 12, 13, wherein The lamp cover becomes a partial cylindrical shape having the arrangement surfaces as chords when viewed parallel to the central axis.

19. The display lamp according to claim 5, wherein When viewed parallel to the central axis, the lamp shade becomes partially cylindrical with the arrangement plane as a chord.

20. The display lamp of claim 10, wherein, When viewed parallel to the central axis, the lamp shade becomes partially cylindrical with the arrangement plane as a chord.

21. The display lamp of claim 11, wherein, When viewed parallel to the central axis, the lamp shade becomes partially cylindrical with the arrangement plane as a chord.

Images