Light source module and optical lens

Abstract

To provide a light source module and an optical lens capable of easily making an area near a lens rim bright.SOLUTION: A light source module includes a first light-emitting element, a lighting body component, and an optical lens. The lighting body component has a bottom section and a cylindrical section, is formed from a cylindrical member in which one end in an axial direction is open, and houses a first light-emitting element. The optical lens has: a lens body having a front section as a light emission surface, a circumferential face section, a first total reflection surface section for totally reflecting light entering from a light incidence surface section toward the circumferential face section, and a second total reflection surface section that is provided in the circumferential face section and raises light totally reflected by the first total reflection surface section to the front surface section; and a cylindrical annular projection that is provided in a side opposite to the front surface section and is fitted to an opening provided in one end of the lighting body component.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a light source module and an optical lens that constitute a lighting device for use in, for example, a railway vehicle. [Background technology]

[0002] Known examples of lighting devices for railway vehicles include headlights and taillights that are equipped on railway vehicles. Headlights, referred to as front marker lights in relevant railway regulations, illuminate the front of the vehicle in the direction of travel at night, improving the driver's visibility and allowing the light to be confirmed from the front of the vehicle at night. Taillights, referred to as rear marker lights in relevant railway regulations, indicate the rear of the vehicle with light or reflection, thereby informing other vehicles traveling behind the vehicle of its presence.

[0003] Due to the differences in functions mentioned above, headlights and taillights differ in their main components, light distribution characteristics and light color. That is, headlights are required to have long-distance light distribution characteristics to illuminate the road ahead, and the light color is generally set to white. Meanwhile, taillights are sufficient to have short-distance light distribution characteristics that are visible from the outside, and the light color is set to red. Therefore, headlights and taillights are generally configured with separate lamps.

[0004] For example, Patent Document 1 describes a signaling lamp for railway vehicles that has multiple LED power sources, each of which has multiple LED elements and a wiring board, a lens that controls the distribution of light from the LED elements, and a holder that holds the lens. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-120221 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the lighting device described in Patent Document 1 has difficulty in illuminating the area of ​​the lens edge that does not face the LED power source on the light exit surface.

[0007] In view of the above circumstances, an object of the present invention is to provide a light source module and an optical lens that can easily illuminate the vicinity of the edge of the lens. [Means for solving the problem]

[0008] A light source module according to one aspect of the present invention includes one or more first light emitting elements, a lamp component, and an optical lens. The lighting component is formed of a cylindrical member having a bottom and a tubular portion, one end of which is open in the axial direction, and houses the first light emitting element. The optical lens has a lens body having a light incident surface portion into which light emitted from the first light-emitting element is incident, a front surface portion which is a light exit surface portion, a peripheral surface portion, a first total reflection surface portion which totally reflects the light incident from the light incident surface portion toward the peripheral surface portion, and a second total reflection surface portion provided on the peripheral surface portion which raises the light totally reflected by the first total reflection surface portion toward the front surface portion, and a cylindrical annular protrusion provided on the opposite side to the front surface portion and fitted into an opening provided at one end of the lamp component.

[0009] In the light source module, the light emitted from the first light emitting element is totally reflected by the first total reflection surface portion and the second total reflection surface portion, so that the light is emitted from the peripheral surface portion of the lens body toward the front surface portion. This makes it easy to illuminate the vicinity of the edge of the lens.

[0010] the lens body has a hole portion that is provided at the center of the lens body when viewed in the axial direction, the hole portion having an inner diameter that decreases from the front surface portion to the light incident surface portion and a side surface having a stepped shape; The first total reflection surface portion may be formed on a side surface of the hole portion and have a stepped shape having a first total reflection surface that totally reflects light incident from the light incident surface portion and a straight line portion extending from the first total reflection surface along the axial direction to the light incident surface portion.

[0011] the peripheral surface portion has an inclined surface that narrows from the front surface portion toward the light incident surface portion when viewed in a direction perpendicular to the axial direction, The second total reflection surface portion may be provided on the inclined surface.

[0012] The front surface may have a structure surface that diffuses light emitted from the first light emitting element.

[0013] The lamp may further include one or more second light emitting elements housed in the lamp component and configured to emit light passing through the lens body toward the front surface.

[0014] the first light emitting element faces a bottom of the hole, the light incident surface portion has a condenser lens facing the first light emitting element, The first light emitting element may emit light that passes through a bottom of the hole via the condenser lens and light that is totally reflected by the first total reflection surface.

[0015] A cross-sectional shape of the lens body perpendicular to the axial direction may be hexagonal.

[0016] The first light-emitting element is one, A plurality of the second light emitting elements may be provided around the first light emitting element.

[0017] the light incident surface portion has a condenser lens facing the first light emitting element, The first light emitting element may emit light that is totally reflected by the first total reflection surface portion via the condenser lens.

[0018] A cross-sectional shape of the lens body perpendicular to the axial direction may be rectangular.

[0019] the first light emitting element is a plurality of elements, The second light emitting element may be provided at a position facing a bottom of the hole and around the first light emitting element.

[0020] An optical lens according to one aspect of the present invention includes a lens body. The lens body has a light incident surface portion into which light emitted from a first light-emitting element is incident, a front surface portion which is a light exit surface portion, a peripheral surface portion, a first total reflection surface portion which totally reflects the light incident from the light incident surface portion toward the peripheral surface portion, and a second total reflection surface portion provided on the peripheral surface portion which raises the light totally reflected by the first total reflection surface portion toward the front surface portion. Effect of the Invention

[0021] According to the light source module of the present invention, the first total reflection surface portion and the second total reflection surface portion enable the emitted light of the first light-emitting element to be emitted from the peripheral surface portion of the lens body, making it easy to illuminate the area near the edge of the lens. [Brief description of the drawings]

[0022] [Figure 1] 1 is a schematic plan view of a lighting device according to a first embodiment of the present invention. [Diagram 2] 1 is a perspective view showing an example of the arrangement of a first light source module in a lighting device. FIG. [Diagram 3] 11 is a perspective view showing an example of the arrangement of a second light source module in the lighting device. FIG. [Figure 4] 1A is an overall view showing a third light source module in a lighting device, where (A) is an oblique view, (B) is a front view seen from the Z-axis direction, (C) is a rear view, (D) is a plan view, and (E) is a right side view. [Diagram 5] FIG. 4 is an exploded perspective view of a third light source module. [Figure 6] 1A is a perspective view, FIG. 1B is a right side view, FIG. 1C is a rear view, and FIG. 1D is a right sectional view of a third optical lens. [Figure 7] 11A is a front view, FIG. 11B is a right side view, and FIG. 11C is a right sectional view. [Figure 8] FIG. 2 is a front view of the lamp body housing a light source. [Figure 9] FIG. 2 is a rear perspective view of a light source module in the lighting device. [Figure 10] 4A and 4B are cross-sectional views of the third light source module, where (A) is a cross-sectional view taken along line A-A in FIG. 4B, and (B) is a cross-sectional view taken along line B-B in FIG. 4B. [Figure 11] 11 is an overall view showing a fourth light source module in a lighting device according to a second embodiment of the present invention, where (A) is an oblique view, (B) is a front view seen from the Z-axis direction, (C) is a right side view, and (D) is a rear view. [Figure 12] FIG. 13 is an exploded perspective view of the fourth light source module. [Figure 13] FIG. 11 is a rear perspective view of the light source module according to the second embodiment. [Figure 14] 11A and 11B are cross-sectional views of the fourth light source module, where (A) is a cross-sectional view taken along line AA in FIG. 11B, and (B) is a cross-sectional view taken along line BB in FIG. 11B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] 1 is a schematic plan view of an illumination device 100 according to a first embodiment of the present invention. In the figure, an X-axis, a Y-axis, and a Z-axis indicate three mutually orthogonal axial directions, and the Z-axis corresponds to the optical axis direction of the illumination device 100.

[0025] <First embodiment> [Overall configuration of lighting equipment] The lighting device 100 of this embodiment is configured as, for example, a front marker lamp or a rear marker lamp for a railway vehicle. The lighting devices 100 are attached to any position at the front of the leading vehicle or at the rear of the last vehicle, as a pair on the left and right with the optical axis direction (Z-axis direction) facing forward or backward. That is, FIG. 1 shows one of the pair of lighting devices.

[0026] As shown in FIG. 1, the lighting device 100 includes a plurality of light source modules 10 and a base member 20 that commonly supports the plurality of light source modules 10.

[0027] The light source modules 10 include a first light source module 11, a second light source module 12, and a third light source module 13. The first light source module 11 and the second light source module 12 function as headlights, and in particular, the first light source module 11 is for high beam and the second light source module is for low beam. The third light source module 13 functions as a taillight.

[0028] In this embodiment, a plurality of each of the first to third light source modules 11 to 13 are used, but the number and layout of the modules are not particularly limited. However, without being limited to this, each light source module may be used singly, or a single light source module may be combined with a plurality of light source modules. Furthermore, the plurality of light source modules 10 is composed of three types of light source modules 11 to 13, but may be composed of two types of light source modules, for example, a light source module for a headlight and a light source module for a taillight, or two types of light source modules for a low beam (headlight) and a high beam (headlight). Furthermore, the plurality of light source modules 10 may be composed of four or more types of light source modules.

[0029] The multiple light source modules 10 are attached on a base member 20 with their optical axes facing the Z-axis direction. The base member 20 is composed of a combination of a first base plate 21, a second base plate 22, and a third base plate 23. Each of the first to third base plates 21 to 23 is composed of a folded and pressed product of a metal plate such as an aluminum alloy or stainless steel.

[0030] FIG. 2 is a perspective view showing an example of the arrangement of the first light source module 11, and FIG. 3 is a perspective view showing an example of the arrangement of the second light source module 12. As shown in FIG.

[0031] The first base plate 21 supports six first light source modules 11. The first base plate 21 has a first support surface 211 (first planar portion) parallel to the XY plane, and a second support surface 212 (second planar portion) perpendicular to the YX plane and inclined at a predetermined angle with respect to the Y-axis direction. As shown in FIG. 2, two first light source modules 11 are attached to the first planar portion 211, and four first light source modules 11 are attached to the second planar portion 212. Each of the first light source modules 11 is supported by the first base plate 21 so that the optical axis direction is aligned in a direction perpendicular to the first support surface 211 (so that it is parallel to the Z-axis direction).

[0032] The second base plate 22 supports four second light source modules 12. The second base plate 22 has a first support surface 221 and a second support surface 222, and these support surfaces 221, 222 are parallel to the XY plane and are provided at positions shifted a predetermined distance in the Z-axis direction. As shown in Fig. 3, two second light source modules 12 are attached to each of the first support surface 221 and the second support surface 222. Each of the second light source modules 12 is supported by the second base plate 22 so that the optical axis direction is aligned in a direction perpendicular to the first support surface 221 (so that it is parallel to the Z-axis direction).

[0033] 1, the third base plate 23 is a plate material parallel to the XY plane, and corresponds to the main body of the base member 20 that commonly supports the first base plate 21 and the second base plate 22. The third base plate 23 is attached to a vehicle body (not shown). Eight third light source modules 13 are attached to the third base plate 23 in non-mounting areas of the first base plate 21 and the second base plate 22. Each of the third light source modules 13 is supported by the third base plate 23 so that the optical axis direction is aligned in a direction perpendicular to the third base plate 23 (so that it is parallel to the Z axis direction).

[0034] (Third light source module) Hereinafter, the third light source module (light source module) 13 will be described. Fig. 4 is an overall view showing the third light source module 13, in which (A) is a perspective view, (B) is a front view seen from the Z-axis direction, (C) is a rear view, (D) is a plan view, and (E) is a right side view. Fig. 5 is an exploded perspective view of the third light source module 13.

[0035] The third light source module 13 includes an optical lens 53, a lamp body 63 (lamp body component), and a light source 43 housed inside the lamp body 63 and having one or more first light emitting elements 431A.

[0036] <Optical lenses> FIG. 6 is an overall view of the optical lens 53, where (A) is a perspective view, (B) is a right side view, (C) is a rear view, and (D) is a right sectional view.

[0037] The optical lens 53 is formed of transparent glass or plastic material. The optical lens 53 has a lens body 530 having a roughly rectangular parallelepiped shape including a rectangular front surface portion 531 and a planar peripheral surface portion 532. The lens body 530 protrudes in the Z direction from one end of the lamp body 63 (61), and the front surface portion 531 and the peripheral surface portion 532 are each configured as a light emission surface that emits light from the light source 43 forward (in the Z-axis direction) and to its surroundings. The cross-sectional shape of the lens body 530 perpendicular to the Z-axis direction is a square shape, and the shape of the front surface portion 531 as viewed from the Z-axis direction is also a square shape. The front surface portion 531 has a structure surface 531A in which a plurality of fine pyramids or the like that diffuse the light emitted from the light source are arranged in the surface. A bottomed hole (cone) 533 is provided in the center of the front surface 531, which is recessed toward the lamp body 63 (61), and a lens surface 534 is provided on the bottom 533A of the hole 533 and its surroundings (side surface) 533B, and it also functions as a light guiding section that guides light emitted from the light source 43 to the front surface 531 and the peripheral surface 532.

[0038] The optical lens 53 further has an annular protrusion 535 that fits into an opening 613 provided at one end of the lamp body 63 (61). The annular protrusion 535 has a cylindrical shape and is integrally formed on the back surface of the lens body 530 on the opposite side to the front surface 531. The annular protrusion 535 has a cylindrical portion 536 that fits into the opening 613 of the lamp body 63 (61), and an annular groove portion 537 provided around the Z-axis direction (optical axis direction) along the outer circumferential surface of the cylindrical portion 536.

[0039] Furthermore, on the rear surface of the lens body 530, on the outer circumferential side of the annular protrusion 535, there is provided an annular abutment surface 538 parallel to the XY plane that abuts against the opening end 614, which is the one end of the lamp body 63 (61). An engagement recess 539 that engages with the engagement protrusion 615 (see FIG. 5) provided on the opening end 614 of the lamp body 63 (61) is provided in a part of the abutment surface 538 (see FIG. 6(C)). The engagement recess 539 is formed with a depth greater than the height of the engagement protrusion 615 from the opening end 614. A detailed description of the function of the optical lens as a light guiding section will be given later.

[0040] <Light body> The light body 61 is made of a metal material such as an aluminum alloy or stainless steel. The light body 61 is cylindrical with one end open and has a bottom, a bottom 611, a tubular portion 612, and an opening 613 (see FIG. 5). An annular protrusion 535 of the optical lens 53 fits into the opening 613, so that an abutment surface 538 of the optical lens 53 abuts against the open end 614. At this time, the optical lens 53 is positioned in its circumferential direction relative to the light body 61 by the engagement between the engagement protrusion 615 provided on the open end 614 and an engagement recess 539 provided on the abutment surface 538.

[0041] The lamp body 61 includes a plurality of fasteners S1 that are inserted from the cylindrical portion 612 toward the bottom of the groove portion 537 of the annular protrusion 535 in a direction perpendicular to the optical axis direction (Z-axis direction). The fasteners S1 are configured as fasteners that fix the annular protrusion 535 to the opening 613. The cylindrical portion 612 is provided with a plurality of insertion holes (screw holes) 616 through which the fasteners S1 penetrate. The fasteners S1 are inserted from the cylindrical portion 612 toward the bottom of the groove portion 611 in a direction perpendicular to the axial direction. The number and locations of the insertion holes 616 are not particularly limited, and may be provided in three or more locations at equal angular intervals, for example. This allows the annular protrusion 535 of the third optical lens 53 to be stably held in the opening 613 of the lamp body 61.

[0042] The interior of the lamp body 61 forms a space for accommodating the light source 43. The light source 43 is composed of a board unit having red LEDs 431A, 431B, which are a plurality of light-emitting elements, and a circuit board 432 supporting the red LEDs 431A, 431B. The circuit board 432 is roughly rectangular, and the red LEDs 431A, 431B are mounted at the center of the front side of the circuit board 432, and a connector part (not shown) to be connected to a power supply cable is mounted on the rear side of the circuit board 432. The inner peripheral surface of the cylindrical part 612 of the lamp body 61 is provided with a plurality of engagement parts 617 that engage with the peripheral edge of the circuit board 432 to position the third light source 43 in its circumferential direction.

[0043] 8 is a front view of the lamp body 61 showing the relationship between the engagement parts 617 and the light source 43. In this embodiment, as shown in the figure, the engagement parts 617 are provided at three locations on the inner circumferential surface of the cylindrical part 612 so as to engage with both ends of the upper side and the center of the lower side of the circuit board 42 of the light source 43. However, this is not limited thereto, and the engagement parts 617 may be provided at positions that engage with the four corners of the circuit board 42.

[0044] The bottom 611 of the lamp body 61 is provided with a window 618 through which the connector parts of the light source 43 positioned by the engagement portion 617 pass, and the outer surface side of the bottom 611 is provided with heat dissipation fins 619 for improving the heat dissipation properties of the light source 43.

[0045] The bottom portion 611 and the cylindrical portion 612 of the light body 61 have a first fixing portion 621 and a second fixing portion 622 connectable to the base member 20, respectively.

[0046] The first fixing portion 621 is a screw insertion hole provided in the bottom portion 611 directly below the window portion 618 as shown in Fig. 7(C), and is fixed by a screw to the first support surface 211 of the first base plate 21 shown in Fig. 2. In this case, an opening capable of accommodating the heat dissipation fin 619 of the lamp body 61 is provided in the first base plate 21, so that the rear surface of the bottom portion 611 is in close contact with the first base plate 211. Also, as shown in Fig. 7(C), a positioning protrusion 620 that fits into a hole formed directly above the opening of the first base plate 211 may be provided on the outer surface of the bottom portion 611. This allows the lamp body 61 to be stably fixed to the first base plate 21 perpendicular to the optical axis direction.

[0047] The second fixing portion 622 is a screw insertion hole provided in a part of the cylindrical portion 612 as shown in Fig. 7(C), and is screw-fixed to the second support surface 212 of the second base plate 21 shown in Fig. 2. In this case, the lamp body 61 can be fixed to the second base plate 22 parallel to the optical axis direction. A plurality of second fixing portions 622 may be provided. In this case, as shown in Fig. 7(C), the insertion hole 616 through which the fastener S1 for fixing the annular protrusion 535 of the first optical lens 51 to the opening 613 of the lamp body 61 is inserted may also be used as the second fixing portion 622.

[0048] As shown in FIG. 5, the third light source module 13 further includes an annular elastic member 70 mounted between the annular protrusion 535 of the optical lens 53 and the light source 43, and a heat transfer sheet 80 disposed between the light source 43 and the bottom 611 of the lamp body 61.

[0049] The elastic member 70 is an annular elastic sheet having an outer diameter and an inner diameter substantially equal to the outer diameter and the inner diameter of the annular protrusion 535, and is sandwiched between the tip of the annular protrusion 535 and the light source 43 (circuit board 432). The elastic member 70 is in close contact with the peripheral portion (four corners) of the circuit board 432 as shown in Fig. 8. This allows the light source 43 (circuit board 432) to be stably held inside the light body 61 when the optical lens 53 is attached to the light body 61.

[0050] The heat transfer sheet 80 is a circular sheet having almost the same shape as the inner surface of the bottom 611 of the lamp body 61. The heat transfer sheet 80 is made of a material having electrical insulation and thermal conductivity. As shown in FIG. 5, the heat transfer sheet 80 has an opening 81 through which the connector part of the light source 43 passes, and a number of notches 82 that accommodate a number of engagement parts 617 that position the light source 43 in its circumferential direction. This allows for good adhesion between the circuit board 432 and the bottom 611, thereby improving the heat dissipation of the light source 43.

[0051] <Light source> As described above, the light source 43 is configured as a board unit having red LEDs 431A, 431B which are a plurality of light-emitting elements, and a circuit board 432 which supports the plurality of red LEDs 431A, 431B, as shown in Fig. 5. The circuit board 432 is roughly circular, and the red LEDs 431A, 431B are mounted on the front side of the circuit board 432, and a connector part which is connected to a power supply cable is mounted on the rear side of the circuit board 432. The peripheral portion of the circuit board 432 is provided with a plurality of notches 434 which engage with a plurality of engagement portions 617 provided on the inner peripheral surface of the cylindrical portion 612 of the lamp body 63 (61).

[0052] [Details of the third light source module] As described above, the third light source module (light source module) 13 will be described. The optical lens 53 of the third light source module 13 will be described in detail below. Fig. 9 is a rear perspective view of the third light source module 13 in the illumination device 100, and Fig. 10 is a cross-sectional view of the third light source module 13, where (A) is the A-A cross section of Fig. 4(B) and (B) is the B-B cross section of Fig. 4(B).

[0053] As described above, optical lens 53 has lens body 530 and annular protrusion 535. Lens body 530 has light incident surface 534a on which light emitted from first light emitting element 431A and second light emitting element 431B is incident, front surface 531 which is a light emitting surface as described above, peripheral surface 532, first total reflection surface 5341B which totally reflects at least a part of the light incident from light incident surface 534a toward peripheral surface 532, and second total reflection surface 5321 which is provided on peripheral surface 532 and causes the light totally reflected by first total reflection surface 5341B to rise toward front surface 531.

[0054] The light incident surface portion 534a is formed on the opposite side of the front surface portion 531 in the lens body 530, facing the first light emitting element 431A and the second light emitting element 431B. The light incident surface portion 534a has a first condensing lens 5351 provided at a position facing the first light emitting element 431A, a second condensing lens 5352 at a position facing in the Z axis direction to the second light emitting element 431B located at the center of the lens body 530 in the Z axis direction among the plurality of second light emitting elements 431B, a light incident recess 5352B facing in the Z axis direction to the plurality of second light emitting elements 431B provided around the plurality of first light emitting elements 431A, and a light incident opposing surface 5352A provided between the plurality of light incident recesses 5352B (in the circumferential direction as viewed from the Z axis direction) (see FIG. 6 and FIG. 9).

[0055] Here, as shown in FIG. 5, FIG. 9, and FIG. 10, in this embodiment, four first light-emitting elements 431A are provided around the second light-emitting element 431B located at the center of the lens body 530 when viewed from the Z-axis direction. The four first light-emitting elements 431A are provided so as to face the first condensing lens 5351. As shown in FIG. 9 and FIG. 10, the first condensing lens 5351 and the second condensing lens 5352 are convex lenses protruding from the light incident surface portion 534a toward the first light-emitting element 431A side. This makes it possible to condense the light emitted from the first light-emitting element 431A and the second light-emitting element 431B as described later.

[0056] As shown in FIG. 4, FIG. 6, and FIG. 9, in this embodiment, the second light emitting element 431B is provided at the center of the lens body 530 (the center of the circuit board 432) when viewed from the Z-axis direction and around the first light emitting element 431A described above. In this embodiment, the number of second light emitting elements 431B provided at the center of the circuit board 432 is one, and the number of second light emitting elements 431B provided around the first light emitting element 431A is four. In this embodiment, the four first light emitting elements 431A are provided in the circumferential direction of a circle centered on the second light emitting element 431B provided at the center, and are equally spaced apart. Similarly, the four second light emitting elements provided around the four first light emitting elements 431A are provided in the circumferential direction of a circle centered on the second light emitting element 431B provided at the center, and are equally spaced apart.

[0057] 6 and 9, the light incident recesses 5352B provided between the multiple light incident opposing surfaces 5352A are formed to be recessed from the light incident surface portion 534a toward the front surface portion 531. The light incident recesses 5352B are provided at equal intervals along the circumferential direction and have the function of diffusing light emitted from the second light emitting element 431B.

[0058] Of course, the number and arrangement of the first light-emitting element 431A and the second light-emitting element 431B are not limited to this, and may be variously configured. For example, the number of the first light-emitting elements 431A may be eight instead of four around the second light-emitting element 431B provided at the center, and the number of the second light-emitting elements 431B around the first light-emitting element 431A may be eight instead of four.

[0059] Light L1 emitted from second light emitting element 431B provided at the center of circuit board 432 passes through lens body 530 and bottom 533A of hole 533 via first condenser lens 5352 facing second light emitting element 431B (see FIG. 10). Here, light L1 is emitted from second light emitting element 431B, travels straight in the Z-axis direction perpendicular to bottom 533A, and transmits through lens body 530.

[0060] Furthermore, light L1' emitted from second light-emitting element 431B provided around first light-emitting element 431A is incident on light incident surface portion 534a and passes through lens body 530. At this time, light L1' is diffused by structure surface 531A. That is, light L1, L1' emitted from second light-emitting element 431B as viewed from the Z-axis direction is emitted from the center and its periphery of lens body 530. Furthermore, light L1, L1' emitted from second light-emitting element 431B is not totally reflected by first total reflection surface portion 534A and second total reflection surface portion 5321 as described later.

[0061] 10(B), light L2 emitted from first light-emitting element 431A is collected by second collecting lens 5351 and travels in a direction parallel to the Z-axis direction (toward first total reflection surface portion 534A). Next, light L2 is totally reflected by first total reflection surface portion 534A to peripheral surface portion 532 of lens body 530, and the totally reflected light L2 is totally reflected by second total reflection surface portion 5321 provided on peripheral surface portion 532 to front surface portion 531.

[0062] First total reflection surface portion 534A will be described. First total reflection surface portion 534A is provided at the center of lens body 530 when viewed from the Z-axis direction, and is formed on side surface 533B of hole portion (cone portion) 533 having an approximately conical shape (more specifically, a stepped shape) whose inner diameter becomes smaller as it approaches light incident surface portion 534a from front surface portion 531. Specifically, first total reflection surface portion 534A has a stepped shape in which first total reflection surfaces 5341A and straight portions 5342A are alternately arranged along the Z-axis direction.

[0063] 9, first total reflection surface 5341A has a plurality of inclined surfaces inclined toward the center of lens body 530, and the inner diameters of first total reflection surfaces 5341A (inner diameters of hole 533 including first total reflection surface 5341A) of first total reflection surfaces 5341A become smaller toward light incident surface 534a from front surface 531. In addition, the inclination angles of first total reflection surfaces 5341A may be different from one another or may be the same.

[0064] 10, straight line portion 5342A is a side surface extending from a lower end of first total reflection surface 5341A along the Z-axis direction to light incident surface portion 534a. That is, first total reflection surface 5341A and straight line portion 5342A form a stepped shape. In this embodiment, there are multiple straight line portions 5342A, and the inner diameter of straight line portion 5342A (the inner diameter of hole portion 533 including straight line portion 5342A) becomes smaller from front surface portion 531 toward light incident surface portion 534a.

[0065] In other words, as described above, by forming first total reflection surface portion 534A, which totally reflects light L2 emitted from first light emitting element 431A, in a stepped shape, it is possible to suppress the radial spread of first total reflection surface 5341A. This makes it possible to increase front surface portion 531 (structure surface 531A) (light emitting area), which is the light emitting surface.

[0066] Next, second total reflection surface portion 5321 will be described. Second total reflection surface portion 5321 is provided on inclined surface 532A narrowing from front surface portion 531 of peripheral surface portion 532 toward light incident surface portion 534a when viewed from the X-axis direction or the Y-axis direction. As shown in Fig. 9(B) , inclined surface 532A is inclined from front surface portion 531 toward light incident surface portion 534a, and totally reflects light L2 emitted from first light emitting element 431A so as to rise toward front surface portion 531.

[0067] Thereby, the third light source module 13 can easily illuminate the peripheral portion S of the front surface portion 531 which is the edge of the lens. In other words, since the first light emitting element 431A and the second light emitting element 431B which are light sources are not provided directly below the peripheral portion S when viewed from the Z-axis direction, it was difficult to illuminate the peripheral portion S. In contrast, according to the present embodiment, the first total reflection surface portion 534A and the second total reflection surface portion 5321 totally reflect the emitted light L2 to illuminate the peripheral portion S. In addition, the appearance (design) of the front surface portion 531 which is the light emission surface can be improved (because if there is a part (peripheral portion S) that is not illuminated, it looks bad).

[0068] 10, in the case of this embodiment, the entire lens (periphery, etc.) can be illuminated more than in the conventional light source module. Also, the entire lens can be illuminated with a smaller number of light emitting elements than in the conventional light source module.

[0069] In the present embodiment, the inside of the hole 533 is an air space, but the present invention is not limited to this, and the hole 533 may be filled with a low refractive index material (for example, fluoride (magnesium fluoride (refractive index: about 1.38), calcium fluoride (refractive index: about 1.40))). This makes it possible to reduce the difference in refractive index with the lens body 530 (increase the critical angle), thereby making it possible to suppress the occurrence of total reflection of the light L1 emitted from the second light emitting element 431B provided at the center.

[0070] <Second embodiment> Regarding the fourth light source module 14 according to the second embodiment, the configuration different from that of the first embodiment will be mainly described, and the same configuration as that of the first embodiment will be assigned the same reference numerals and the description thereof will be omitted or simplified. FIG. 11 is an overall view showing the fourth light source module (fourth light source module) 14 in the lighting device according to the second embodiment of the present invention, (A) being a perspective view, (B) being a front view seen from the Z-axis direction, (C) being a right side view, and (D) being a rear view. FIG. 12 is an exploded perspective view of the fourth light source module 14. FIG. 13 is a rear perspective view of the fourth light source module 14 according to the second embodiment, and FIG. 14 is a cross-sectional view of the fourth light source module 14, (A) being a cross-section A-A of FIG. 11(B), and (B) being a cross-section B-B of FIG. 11(B).

[0071] The fourth light source module 14 differs from the third light source module 14 only in the configurations of the optical lens 53 and the light source 43, and the lamp body 63 is composed of lamp body parts common to the lamp body 61 of the third light source module 13. Similarly to the third light source module 13, the fourth light source module 14 also includes an elastic member 70 and a heat dissipation sheet 80. Here, the optical lens 54 and the light source 44 will mainly be described.

[0072] <Optical lenses> The optical lens 54 is made of transparent glass or plastic material. The optical lens 54 has a lens body 540 having a roughly rectangular parallelepiped shape including a rectangular front surface portion 541 and a planar peripheral surface portion 542. The lens body 540 protrudes in the Z direction from one end of the lamp body 63 (61), and the front surface portion 541 and the peripheral surface portion 542 are each configured as a light emission surface that emits light from the light source 43' forward (in the Z-axis direction) and around it. The cross-sectional shape of the lens body 540 perpendicular to the Z-axis direction is hexagonal, and the shape of the front surface portion 541 as viewed from the Z-axis direction is also hexagonal. The front surface portion 541 has a structure surface 541A in which a plurality of fine pyramids or the like that diffuse the light emitted from the light source are arranged in the surface. A bottomed hole (cone) 543 recessed toward the lamp body 63 (61) is provided in the center of the front surface 541, and lens surfaces 544 are provided on the bottom 543A of the hole 543 and its surroundings (side surfaces) 543B, and it also functions as a light guiding section that guides light emitted from the light source 43 to the front surface 531 and peripheral surface 532.

[0073] The optical lens 54 further has an annular protrusion 545 that fits into an opening 613 provided at one end of the lamp body 63 (61). The annular protrusion 545 has a cylindrical shape and is integrally formed on the back surface of the lens body 540 on the opposite side to the front surface 541. The annular protrusion 545 has a cylindrical portion 546 that fits into the opening 613 of the lamp body 63 (61) and an annular groove portion 547 provided around the Z-axis direction (optical axis direction) along the outer circumferential surface of the cylindrical portion 546.

[0074] Furthermore, on the rear surface of the lens body 540, on the outer circumferential side of the annular protrusion 545, there is provided an annular abutment surface 548 parallel to the XY plane that abuts against the opening end 614, which is the one end of the lamp body 63 (61). An engagement recess 549 that engages with an engagement protrusion 615 (see FIG. 12) provided on the opening end 614 of the lamp body 63 (61) is provided in a part of the abutment surface 548 (see FIG. 11(D)). The engagement recess 549 is formed with a depth greater than the height of the engagement protrusion 615 from the opening end 614. A detailed description of the function of the optical lens as a light guiding section will be given later.

[0075] <Light source> As described above, the light source 43' is composed of a board unit having red LEDs 441A, 441B which are a plurality of light-emitting elements, and a circuit board 442 which supports the plurality of red LEDs 441A, 441B, as shown in Fig. 12. The circuit board 442 is roughly circular, and the red LEDs 441A, 441B are mounted on the front side of the circuit board 442, and a connector part which is connected to a power supply cable is mounted on the rear side of the circuit board 442. The peripheral portion of the circuit board 442 is provided with a plurality of notches 444 which engage with a plurality of engagement portions 617 provided on the inner peripheral surface of the cylindrical portion 612 of the lamp body 63 (61).

[0076] [Details of the fourth light source module] As described above, there is a description of the fourth light source module (light source module) 14. Hereinafter, the optical lens 54 of the fourth light source module 14 will be described in detail.

[0077] As described above, optical lens 54 has lens body 540 and annular protrusion 545. Lens body 540 has light incident surface 544a on which light emitted from first light emitting element 441A and second light emitting element 441B is incident, front surface 541 which is a light emitting surface as described above, peripheral surface 542, first total reflection surface 5441B which totally reflects at least a part of the light incident from light incident surface 544a toward peripheral surface 542, and second total reflection surface 5421 which is provided on peripheral surface 542 and causes the light totally reflected by first total reflection surface 5441B to rise toward front surface 541.

[0078] The light incident surface portion 544a is formed on the opposite side of the front surface portion 541 in the lens body 540, facing the first light emitting element 441A and the second light emitting element 441B. The light incident surface portion 544a has a condenser lens 5451 provided at a position facing the first light emitting element 431A located at the center of the lens body 540 in the Z axis direction, a plurality of light incident opposing surfaces 5452B facing the second light emitting element 441B in the Z axis direction, a light incident recessed portion 5452B provided between the plurality of light incident opposing surfaces 5452A (in the circumferential direction as viewed from the Z axis direction), and a light inclined surface portion 5452C provided between the condenser lens 5451 and the plurality of light incident opposing surfaces 5452B and the plurality of light incident recessed portions 5452B as viewed from the Z axis direction (see FIGS. 11 and 13).

[0079] 11 to 13, in this embodiment, one first light-emitting element 441A is located at the center of the lens body 540 when viewed from the Z-axis direction. One first light-emitting element 441A is provided to face a second condenser lens 5451. As shown in FIGS. 2 and 6, the second condenser lens 5451 is a convex lens that protrudes from the light incident surface portion 544a toward the first light-emitting element 441A side. This makes it possible to condense light emitted from the first light-emitting element 441A, as described later.

[0080] As shown in Figs. 11 to 13, in this embodiment, eight second light emitting elements 441B are provided around the first light emitting element 441A as viewed from the Z-axis direction. As shown in Fig. 2, the eight second light emitting elements 441B are provided along the circumferential direction of a circle centered on the first light emitting element 441A and face the light incident surface facing portions 5452A. The eight second light emitting elements 441B are equally spaced from each other. As shown in Figs. 11 and 13, the light incident facing portions 5452A are provided along the circumferential direction at equal intervals and inclined at a predetermined angle in the XY plane, and have a function of controlling the angle at which light emitted from the second light emitting element 441B is refracted. In other words, the light incident facing portions 5452A have a function of refracting the light emitted from the second light emitting element 441B.

[0081] 13 and 14, the light inclination surface portion 5452C is provided in an annular shape, and is shaped like a letter V (widened toward the center of the lens body 540) as viewed from the X-axis direction. The light inclination surface portion 5452C has a function of controlling the light emitted from the second light-emitting element 441B to illuminate the center of the lens body 530 (as viewed from the Z-axis direction) of the front surface portion 542 (for example, the left two in L1′ of FIG. 14(A)).

[0082] 11 and 13, the light incident recesses 5452B provided between the multiple light incident opposing surfaces 5452A are formed to be recessed from the light incident surface portion 544a toward the front surface portion 542. The light incident recesses 5452B are provided at equal intervals along the circumferential direction and have the function of collecting light emitted from the second light emitting element 441B.

[0083] Of course, the number and arrangement of the first light emitting element 441A and the second light emitting element 441B are not limited to this, and may be variously configured. For example, the number of second light emitting elements 441B may be four instead of eight around the first light emitting element 441A provided at the center.

[0084] Light L1, which is a part of light emitted from first light-emitting element 441A provided at the center of circuit board 442, passes through lens body 540 and bottom 543A of hole 543 via second condenser lens 5451 facing first light-emitting element 441A (see FIG. 13). Here, light L1 is light that is emitted from first light-emitting element 441A, travels straight in the Z-axis direction perpendicular to bottom 533A, and passes through lens body 530.

[0085] Furthermore, light L1' emitted from second light-emitting element 441B provided around first light-emitting element 441A is incident on light incident surface portion 544a and passes through lens body 540. At this time, light L1' is diffused by structure surface 541A. That is, light L1, L1' emitted from second light-emitting element 441B as viewed from the Z-axis direction is emitted from the center and its periphery of lens body 540. Furthermore, light L1, L1' emitted from second light-emitting element 441B is not totally reflected by first total reflection surface portion 544A and second total reflection surface portion 5421 as described later.

[0086] Also, light L2, which is a part of the light emitted from first light emitting element 441A, travels straight along a direction inclined at a predetermined angle from the Z-axis direction, is collected by second collecting lens 5451, and travels in a direction parallel to the Z-axis direction (toward first total reflection surface portion 544A) as shown in FIG. 14(B). Next, light L2 is totally reflected by first total reflection surface portion 544A to peripheral surface portion 542 of lens body 540, and the totally reflected light L2 is totally reflected by second total reflection surface portion 5421 provided on peripheral surface portion 542 toward front surface portion 541. The light L1' incident on hole portion 543 and light L2 have different angles of incidence on first total reflection surface portion 544A. That is, light L2 is totally reflected by controlling the angle of incidence on first total reflection surface portion 544A by second collecting lens 5451.

[0087] First total reflection surface portion 544A will be described. First total reflection surface portion 544A is provided at the center of lens body 540 when viewed from the Z-axis direction, and is formed on side surface 543B of hole portion (cone portion) 543 having an approximately conical shape (more specifically, a stepped shape) whose inner diameter becomes smaller as it approaches light incident surface portion 544a from front surface portion 541. Specifically, first total reflection surface portion 544A has a stepped shape in which first total reflection surfaces 5441A and straight portions 5442A are alternately arranged along the Z-axis direction.

[0088] 14, first total reflection surface 5341A has a plurality of inclined surfaces inclined toward the center of lens body 540, and the inner diameters of first total reflection surfaces 5441A (inner diameters of hole portions 543 including first total reflection surfaces 5441A) of first total reflection surfaces 5441A become smaller toward light incident surface portion 544a from front surface portion 541. In addition, the inclination angles of first total reflection surfaces 5341A may be different from one another or may be the same.

[0089] 13, straight line portion 5442A is a side surface extending from a lower end of first total reflection surface 5441A to light incident surface portion 544a along the Z-axis direction. That is, first total reflection surface 5441A and straight line portion 5442A form a stepped shape. In this embodiment, there are multiple straight line portions 5442A, and the inner diameter of straight line portion 5442A (the inner diameter of hole portion 543 including straight line portion 5442A) becomes smaller from front surface portion 541 toward light incident surface portion 544a.

[0090] That is, as described above, by forming first total reflection surface portion 544A, which totally reflects light L2 emitted from first light emitting element 441A, in a stepped shape, it is possible to suppress the radial spread of first total reflection surface 5441A. This makes it possible to increase front surface portion 541 (structure surface 541A) (light emitting area), which is the light emitting surface.

[0091] Next, second total reflection surface portion 5421 will be described. Second total reflection surface portion 5421 is provided on inclined surface 542A narrowing from front surface portion 541 of peripheral surface portion 542 toward light incident surface portion 544a when viewed from the X-axis direction or the Y-axis direction. As shown in Fig. 13(B) , inclined surface 542A is inclined from front surface portion 541 toward light incident surface portion 544a, and totally reflects light L2 emitted from first light emitting element 441A so as to rise toward front surface portion 541.

[0092] As a result, the fourth light source module 14 can easily illuminate the peripheral portion S of the front portion 541, which is the edge of the lens, with only the first light emitting element 441A. In other words, since the first light emitting element 441A and the second light emitting element 441B, which are light sources, are not provided directly below the peripheral portion S when viewed from the Z-axis direction, it has been difficult to illuminate the peripheral portion S. In contrast, according to this embodiment, the first total reflection surface portion 544A and the second total reflection surface portion 5421 can totally reflect the emitted light L2 to illuminate the peripheral portion S. In addition, the appearance (design) of the front portion 541, which is the light emission surface, can be improved (because a non-illuminated portion (peripheral portion S) would look bad).

[0093] Furthermore, in the fourth light source module 14, the lens body 540 has a hexagonal shape (as viewed from the Z-axis direction). This makes the distance from the first light emitting element 441A provided at the center to the edge of the lens (peripheral portion S) shorter than in a quadrangle, so that the peripheral portion S can be illuminated more.

[0094] In addition, in the case of this embodiment, the entire lens (such as the periphery) can be illuminated more than in the conventional light source module. Also, compared to the conventional light source module, the number of light emitting elements is smaller, and the entire lens can be illuminated while increasing the central luminous intensity.

[0095] In this embodiment, the light emitting element is red, but of course, it is not limited to this and may be other colors. Also, in this embodiment, the third light source module 13 and the fourth light source module 14 are for taillights, but it is not limited to this and may be for headlights, etc. [Explanation of symbols]

[0096] 10…Light source module 11…First light source module 12…Second light source module 13…Third light source module 20...Base member 21…First base plate 22…Second base plate 23…Third base plate 43…Light source 53...Optical lens 63...Third light body 100…Lighting equipment 431A, 431B...Light emitting element 432...Circuit board 530…Lens body 531...Front part 532...peripheral part 534…Lens section 535…Ring protrusion 538…Abutment surface 539...Engagement recess 611…Bottom 612...Cylindrical part 613…Opening 615…Engagement protrusion 617…Engagement part 621...First fixed part 622…Second fixed part

Claims

1. one or more first light emitting elements; a lamp part formed of a cylindrical member having a bottom and a tubular part and an open end in an axial direction, the lamp part housing the first light emitting element; a lens body having a light incident surface portion on which light emitted from the first light emitting element is incident, a front surface portion which is a light exit surface portion, a peripheral surface portion, a first total reflection surface portion which totally reflects the light incident from the light incident surface portion toward the peripheral surface portion, and a second total reflection surface portion which is provided on the peripheral surface portion and which directs the light totally reflected by the first total reflection surface portion toward the front surface portion; A cylindrical annular protrusion is provided on the opposite side to the front surface and fitted into an opening provided at one end of the lamp body part; An optical lens having A light source module comprising:

2. 2. The light source module according to claim 1, the lens body has a hole portion that is provided at the center of the lens body when viewed in the axial direction, the hole portion having an inner diameter that becomes smaller as it approaches the light incident surface portion from the front surface portion and has a stepped side surface, The first total reflection surface portion is formed on a side surface of the hole portion and has a stepped shape including a first total reflection surface that totally reflects light incident from the light incident surface portion and a straight line portion that extends from the first total reflection surface to the light incident surface portion along the axial direction. Light source module.

3. 2. The light source module according to claim 1, the peripheral surface portion has an inclined surface that narrows from the front surface portion toward the light incident surface portion when viewed in a direction perpendicular to the axial direction, The second total reflection surface portion is provided on the inclined surface. Light source module.

4. 2. The light source module according to claim 1, The front surface has a structure surface that diffuses the light emitted from the first light emitting element. Light source module.

5. 3. The light source module according to claim 2, The lamp further includes one or more second light emitting elements that are housed in the lamp body and emit light that passes through the lens body toward the front portion. Light source module.

6. 6. The light source module according to claim 5, the first light emitting element faces a bottom of the hole, the light incident surface portion has a condenser lens facing the first light emitting element, The first light emitting element emits light that passes through the bottom of the hole via the condenser lens and light that is totally reflected by the first total reflection surface. Light source module.

7. 7. The light source module according to claim 6, The cross-sectional shape of the lens body perpendicular to the axial direction is hexagonal. Light source module.

8. 7. The light source module according to claim 6, The first light emitting element is one. The second light emitting element is provided in plurality around the first light emitting element. Light source module.

9. 6. The light source module according to claim 5, the light incident surface portion has a condenser lens facing the first light emitting element, The first light emitting element emits light that is totally reflected by the first total reflection surface portion via the condenser lens. Light source module.

10. 10. The light source module according to claim 9, The cross-sectional shape of the lens body perpendicular to the axial direction is a rectangle. Light source module.

11. 10. The light source module according to claim 9, The first light emitting element is a plurality of elements, The second light emitting element is provided at a position facing the bottom of the hole and around the first light emitting element. Light source module.

12. a lens body having a light incident surface portion on which light emitted from one or more first light emitting elements is incident, a front surface portion which is a light exit surface portion, a peripheral surface portion, a first total reflection surface portion which totally reflects the light incident from the light incident surface portion toward the peripheral surface portion, and a second total reflection surface portion which is provided on the peripheral surface portion and which directs the light totally reflected by the first total reflection surface portion toward the front surface portion; An optical lens comprising:

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