JP2022029214A - Inner lens of vehicular lighting fixture, vehicular lighting fixture - Google Patents

Abstract

To uniformly emit light.SOLUTION: An inner lens of a vehicular lighting fixture according to the present invention comprises: a plurality of reflecting surfaces 26 provided in a back surface 25, and reflecting a portion of internally propagated light L1 as reflected light L2 to the side of a front surface 24; and an emitting surface 20 provided in the front surface 24, and emitting a portion of the reflected light L2 as emitted light L3 to the outside. The emitting surface 20 is divided into a plurality of minute emitting surfaces 21 and 210. At least a portion 21 of the plurality of minute emitting surfaces 21 and 210 is inclined at a predetermined angle θ1 or lower with respect to a fundamental surface 23. As a result, the inner lens of the vehicular lighting fixture according to the present invention can uniformly emit light.SELECTED DRAWING: Figure 6

Description

The present invention relates to an inner lens (light guide body) of a vehicle lamp. The present invention also relates to a vehicle lamp provided with an inner lens.

As a vehicle lighting tool that causes a long light guide body (inner lens) to emit light more uniformly, for example, there is one shown in Patent Document 1. The vehicle lighting equipment of Patent Document 1 includes a light guide body (inner lens) and a reflector. The light guide body guides the light emitted from the light source and emits the light reflected by a plurality of reflecting portions provided on the back side from the front side to emit light emitted from the light emitting portion provided on the front side. It is something to let. The reflector is arranged so as to face the back surface of the light guide body, and the light emitted from the back surface of the light guide body to the outside is reflected while being diffused toward the back surface of the light guide body by a plurality of diffusing portions. , The thing.

The vehicle lamp of Patent Document 1 can make a long light guide body (inner lens) emit light more uniformly.

Japanese Unexamined Patent Publication No. 2019-145326

It is important that the inner lens of such a vehicle lamp emits light uniformly. Further, in a vehicle lamp equipped with an inner lens, it is important that the inner lens emits light uniformly.

An object to be solved by the present invention is to provide an inner lens of a vehicle lamp capable of uniformly emitting light, and to provide a vehicle lamp capable of uniformly emitting light by the inner lens.

The inner lens of the vehicle lighting tool of the present invention is an inner lens of the vehicle lighting tool that propagates light by total internal reflection action, and is provided on the back surface to reflect a part of the light propagated inside. It has a plurality of reflecting surfaces that reflect light on the surface side, and an emission surface that is provided on the surface and emits a part of the reflected light to the outside as emission light, and the emission surface has a plurality of minute amounts. It is divided into emission surfaces, and at least a part of the plurality of minute emission surfaces is inclined at a predetermined angle or less with respect to the basic surface.

In the inner lens of the vehicle lamp of the present invention, it is preferable that the predetermined angle is the angle difference between the normal of the minute emission surface and the normal of the basic surface.

In the inner lens of the vehicle lamp of the present invention, the predetermined angle is an angle at which the brightness on the emission surface is about half or more of the brightness on the emission surface when a plurality of minute emission surfaces are not provided. Is preferable.

In the inner lens of the vehicle lamp of the present invention, it is preferable that the predetermined angle is about 17 degrees.

In the inner lens of the vehicle lamp of the present invention, a plurality of minute exit surfaces inclined at a predetermined angle or less with respect to the basic surface are about 60% or more of the total of the plurality of minute exit surfaces. It is preferable that there is.

In the inner lens of the vehicle lamp of the present invention, among the plurality of minute emission surfaces, the plurality of minute emission surfaces inclined at least by a predetermined angle or less with respect to the basic surface are each in a low stagger amount sequence. It is preferably distributed based on.

In the inner lens of the vehicle lamp of the present invention, among the plurality of minute emission surfaces, the plurality of minute emission surfaces inclined at least by a predetermined angle or less with respect to the basic surface are polygonal and flat. It is preferable to make a.

In the inner lens of the vehicle lighting tool of the present invention, among the plurality of minute emission surfaces, the plurality of minute emission surfaces inclined at least by a predetermined angle or less with respect to the basic surface form a plane as a reference minute. At least one of the angle at which the emission surface is tilted, the direction in which the mother point, which is the center of the reference minute emission surface, is shifted, the amount of deviation of the mother point, and the amount of protrusion of the reference minute emission surface are determined based on the low discrepancy amount sequence. Is preferable.

In the inner lens of the vehicle lighting tool of the present invention, it is preferable that the emitted light emitted from the emitting surface to the outside forms the light distribution of the tail lamp function or the light distribution of the stop lamp function.

The inner lens of the vehicle lamp of the present invention is preferably made of acrylic or polycarbonate.

In the inner lens of the vehicle lamp of the present invention, a reflective surface that reflects light emitted from the inner lens to the inside of the inner lens is arranged on at least the back surface side of the inner lens. preferable.

The vehicle lamp of the present invention is characterized by comprising a lamp housing and an outer lens forming a lamp chamber, and an inner lens of the vehicle lamp of the present invention.

The inner lens of the vehicle lamp of the present invention can emit light uniformly. Further, in the vehicle lamp of the present invention, the inner lens can emit light uniformly.

FIG. 1 is a front view showing an inner lens of a vehicle lamp and an embodiment of the vehicle lamp according to the present invention. FIG. 2 is a cross-sectional view (a sectional view taken along line II-II in FIG. 1) showing an inner lens and a lamp for a vehicle. FIG. 3 is a vertical sectional view (a sectional view taken along line III-III in FIG. 1) showing an inner lens and a lamp for a vehicle. FIG. 4 is a partially enlarged front view showing the inner lens. FIG. 5 is a partially enlarged cross-sectional view (VV line cross-sectional view in FIG. 4) of the inner lens showing the optical path. FIG. 6 is a partially enlarged cross-sectional explanatory view (enlarged cross-sectional explanatory view of the VI portion in FIG. 5) showing the relative relationship between the normal of the minute exit surface of the inner lens and the normal of the basic surface. FIG. 7 is an explanatory diagram showing the relative relationship between the diffusion angle and the luminance ratio of the minute emission surface when the inner lens is made of PMMA (acrylic). FIG. 8 is an explanatory diagram showing the relative relationship between the diffusion angle and the brightness ratio of the minute emission surface when the inner lens is composed of a PC (polycarbonate). FIG. 9 is an explanatory diagram showing the relative relationship between the diffusion angle and the normal angle difference of the minute emission surface when the inner lens is made of PMMA (acrylic). FIG. 10 is an explanatory diagram showing the relative relationship between the diffusion angle and the normal angle difference of the minute exit surface when the inner lens is composed of a PC (polycarbonate). FIG. 11 is a partially enlarged front view showing a minute ejection surface of the inner lens. FIG. 12 is an explanatory diagram showing a light distribution table for measuring the characteristics of the light distribution. FIG. 13 is an explanatory diagram showing a process of forming a minute emission surface from a reference minute emission surface. (A) is an explanatory front view showing a reference micro-exit plane. (B) is an explanatory front view showing a state in which the reference micro-exit surface is tilted. FIG. 14 is an explanatory diagram showing a process of forming a minute emission surface from a reference minute emission surface. (A) is an explanatory vertical cross-sectional view (CC line cross-sectional view in FIG. 13B) showing a state in which the reference micro-exit plane is tilted. (B) is an explanatory cross-sectional view (D-line cross-sectional view in FIG. 13 (B)) showing a state in which the reference micro-exit plane is tilted. FIG. 15 is an explanatory diagram showing a process of forming a minute emission surface from a reference minute emission surface. (A) is an explanatory front view showing a direction in which the mother point of the center of the reference micro-exit surface is shifted. (B) is an explanatory front view showing an amount of shifting the mother point of the reference micro-exit surface. FIG. 16 is an explanatory diagram showing a process of forming a minute emission surface from a reference minute emission surface. (A) is an explanatory vertical cross-sectional view (E-E line cross-sectional view in FIG. 15B) showing an amount of protrusion of a reference micro-exit surface. (B) is an explanatory cross-sectional view (FIG. FF cross-sectional view in FIG. 15B) showing the amount of protrusion of the reference microexit surface. FIG. 17 is an explanatory front view showing a state in which the mother points of a plurality of reference micro-exit surfaces are shifted from each other in the process of forming the micro-exit surface from the reference micro-exit surface. FIG. 18 is an explanatory front showing a state in which a plurality of micro-exit surfaces are formed by Voronoi division based on a mother point in which a plurality of reference micro-exit surfaces are shifted in a process of forming a micro-exit surface from a reference micro-exit surface. It is a figure. FIG. 19 is a block diagram showing an exit surface shape determining device, a mold processing device, a mold, and an inner lens that carry out the present invention. FIG. 20 is a front view showing a modified example of the vehicle lamp according to the present invention. FIG. 21 is a partially enlarged front view showing a modified example of the inner lens of the vehicle lamp according to the present invention. FIG. 22 is a partially enlarged vertical cross-sectional view of the inner lens showing the optical path (XXII-XXII line cross-sectional view in FIG. 21).

Hereinafter, three examples of the inner lens of the vehicle lamp and the embodiment (embodiment and modification) of the vehicle lamp according to the present invention will be described in detail with reference to the drawings. In this specification, the front, rear, top, bottom, left, and right are the inner lens of the vehicle lamp according to the present invention, and the front, rear, top, bottom, left, and right when the vehicle lamp is mounted on the vehicle. Is. Since the drawings are schematic views, the main parts are shown, parts other than the main parts are omitted, and a part of the hatching is omitted.

In the figure, X, Y, and Z constitute Cartesian coordinates (XYZ Cartesian coordinate system). The X-axis is an axis in the vertical direction, with the arrow direction being up and the direction opposite to the arrow being down. The Y-axis is an axis in the left-right (horizontal) direction, with the arrow direction on the right and the direction opposite to the arrow on the left. The Z-axis is an axis in the front-back (horizontal) direction orthogonal to the X-axis and the Y-axis, with the arrow direction being the back and the direction opposite to the arrow being the front. Further, in FIG. 12, the reference numeral “HL-HR” indicates the horizontal lines on the left and right of the light distribution table, and the reference numeral “VU-VD” indicates the vertical lines above and below the light distribution table.

(Explanation of the configuration of the embodiment)
1 to 19 show an inner lens of a vehicle lamp and an embodiment of the vehicle lamp according to the present invention. Hereinafter, the configuration of the inner lens of the vehicle lamp and the vehicle lamp according to this embodiment will be described. In the figure, reference numeral 1 is a vehicle lamp according to this embodiment, and reference numeral 2 is an inner lens (hereinafter, referred to as “inner lens”) of the vehicle lamp 1 according to this embodiment.

(Explanation of vehicle lamp 1)
In this example, the vehicle lighting fixture 1 is any one of a tail lamp, a stop lamp, or a tail stop lamp constituting the rear combination lamp. The vehicle lighting fixture 1 is installed on both the left and right sides of the rear part of the vehicle (not shown).

As shown in FIGS. 1, 2, and 3, the vehicle lamp 1 includes an inner lens 2, a housing (lamp housing) 3, an outer lens 4, a light source 5, and an inner housing 6. The front view of FIG. 1 is a view of the front side of the vehicle from the rear side.

(Explanation of housing 3)
The housing 3 is made of, for example, a light-impermeable member (resin member or the like). As shown in FIGS. 1, 2, and 3, the housing 3 is composed of two parts, a first housing portion 31 and a second housing portion 32, in this example. The housing 3 may be composed of one component.

The first housing portion 31 is arranged on the rear side of the vehicle lamp 1. The first housing portion 31 has a hollow shape. An opening 33 is provided on the front side (front side) of the first housing portion 31. A closing portion 34 is provided on the rear side of the first housing portion 31. The closed portion 34 is provided with a mounting hole 35.

The second housing portion 32 is arranged on the front side of the vehicle lighting fixture 1. The second housing portion 32 has a plate shape. A rectangular opening 36 is provided in the central portion of the second housing portion 32. A convex portion 37 is integrally provided on the front edge portion of the opening portion 36. A wall portion 38 is integrally provided at the edge portion on the rear surface side of the opening portion 36. The convex portion 37 and the wall portion 38 are provided on the entire circumference of the opening 36 in this example. The convex portion 37 may be partially provided.

A cover portion 39 is integrally provided on the entire circumference of the edge portion on the rear surface side of the second housing portion 32. The edge portion of the opening 33 of the first housing portion 31 is fitted in the cover portion 39 of the second housing portion 32. The first housing portion 31 and the second housing portion 32 are integrally attached. As a result, the housing 3 is configured.

(Explanation of outer lens 4)
The outer lens 4 is composed of, for example, a light-transmitting member (resin member or the like). As shown in FIGS. 1, 2, and 3, the outer lens 4 is a rectangle that is one size larger than the opening 36 of the second housing portion 32 and one size smaller than the convex portion 37 of the second housing portion 32. It forms a plate shape.

The outer lens 4 is red if the color of the light L1 from the light source 5 is white. On the other hand, the outer lens 4 does not need to be red if the light L1 from the light source 5 is red light or the inner lens 2 is red, and may be colorless and transparent.

The outer lens 4 is fitted in the convex portion 37 of the second housing portion 32. The outer lens 4 and the second housing portion 32 are integrally attached. As a result, the light chamber 40 is formed by the outer lens 4 and the housing 3. The inner lens 2 and the inner housing 6 are arranged in the light chamber 40. The inner lens 2 and the inner housing 6 are attached to the housing 3 directly or via other components.

The design surface of the outer surface of the outer lens 4 and the design surface of the outer surface of the second housing portion 32 are along the design surface from the rear portion to the side portion of the vehicle.

(Explanation of light source 5)
As shown in FIG. 2, the light source 5 is a socket type light source, and has a cylindrical portion 50 at the front end portion, a flange portion 51 at the intermediate portion, and a fin portion 52 at the rear end portion.

The cylindrical portion 50 is provided with a substrate (not shown), one or more light emitting elements (not shown), and the like. In this example, the light emitting device is a self-luminous semiconductor type light emitting device (semiconductor light emitting device) such as LED, OEL or OLED (organic EL). The light emitting element has a light emitting surface. The light emitting surface of the light emitting element emits light L1.

The flange portion 51 is detachably attached to the edge of the mounting hole 35 of the first housing portion 31 together with the mounting convex portion provided on the cylindrical portion 50. As a result, the light source 5 is detachably attached to the housing 3. A plurality of light sources 5, three in this example, are attached to the housing 3. The number of light sources 5 is not particularly limited.

The fin portion 52 is a heat radiating portion, and releases heat generated in the light emitting element to the outside via the cylindrical portion 50 and the flange portion 51.

(Explanation of inner lens 2)
The inner lens 2 is a light-transmitting member (resin member or the like), and in this example, it is made of a colorless transparent resin material such as PMMA (acrylic) or PC (polycarbonate) which has a red color. The inner lens 2 does not need to be red if the light L1 from the light source 5 is red light or the outer lens 4 is red, and may be colorless and transparent.

The inner lens 2 propagates the light L1 by the total internal reflection action. As shown in FIGS. 1 to 6, the inner lens 2 has a plate shape in this example. The inner lens 2 is composed of a light entering portion 28 and a light emitting portion 29. The light entering portion 28 and the light emitting portion 29 each have a plate shape, and are integrally configured via curved portions.

An incident surface 280 is provided on one side surface of the light entering portion 28 opposite to the curved portion. The incident surface 280 faces the light emitting surface of the light emitting element of the light source 5. The incident surface 280 causes the light L1 from the light source 5 to enter the incoming light portion 28, that is, the inside of the inner lens 2. The light L1 from the light source 5 incident on the inside of the inner lens 2 from the incident surface 280 is transferred from the incident surface 280 to the curved portion of the light emitting portion 29 via the incoming light portion 28 and the light emitting portion 29 due to the total reflection action of the inner lens 2. On the other hand, it is propagated (guided) to one side of the opposite side.

The plate-shaped inner lens 2 has a front surface 24 and a back surface 25. The front surface 24 and the back surface 25 face each other in parallel.

As shown in FIGS. 4 and 5, on the back surface 25, a plurality of (plural) reflecting surfaces 26 and a plurality (plural) connecting surfaces 27 are arranged in the vertical direction (direction in which the light L1 is propagated). It is provided in the direction of intersection). One reflecting surface 26 and one connecting surface 27 form one prism. The reflective surface 26 and the connecting surface 27 form a concave shape recessed from the back surface 25 to the front surface 24.

The plurality of reflecting surfaces 26 reflect the light L1 inside the light emitting portion 29 of the inner lens 2 as the reflected light L2 toward the surface 24 side. The plurality of reflecting surfaces 26 are inclined with respect to the back surface 25 and face the direction in which the light L1 is propagated. The plurality of connecting surfaces 27 are inclined to the draft of the mold with respect to the back surface 25.

An exit surface 20 is provided on the surface 24 (particularly, the surface 24 of the light emitting portion 29). As shown in FIG. 5, the exit surface 20 emits a part of the reflected light L2 from the plurality of reflecting surfaces 26 to the outside as the emitted light L3. As a result, the emission surface 20 forms a predetermined light distribution (not shown). In this example, the predetermined light distribution is the light distribution of the tail lamp function or the light distribution of the stop lamp function (hereinafter, may be simply referred to as “light distribution”).

(Explanation of inner housing 6)
As shown in FIGS. 2 and 3, the inner housing 6 is composed of two parts, a first inner housing portion 61 and a second inner housing portion 62, in this example. The inner housing 6 may be composed of one component.

The first inner housing portion 61 covers the back surface 25 side of the light receiving portion 28 and the light emitting portion 29 of the inner lens 2. The second inner housing portion 62 covers the surface 24 side of the light receiving portion 28 of the inner lens 2.

A reflective surface is provided on the surface of the first inner housing portion 61 and the second inner housing portion 62 facing the inner lens 2. The reflective surface reflects light (not shown) emitted from the inner lens 2 to the outside and re-enters the inner lens 2. The reflective surface is, for example, aluminum vapor deposition, aluminum coating, white coating, or the like. The reflective surface may be arranged at least on the back surface side of the light emitting portion 29 of the inner lens 2.

As a result, at least the back surface 25 (further, the back surface 25 of the light emitting portion 29) side of the inner lens 2 reflects the light emitted from the back surface 25 of the inner lens 2 to the inner side of the inner lens 2 from the back surface 25. A reflective surface to be inserted inside the lens 2 is arranged.

The inner housing 6 has a function of re-entering the light leaked from the inner lens 2 into the inner lens 2 to effectively use the light of the light source 5, and a function of covering the structure in the light chamber 40 to improve the appearance. It has.

(Explanation of the minute exit surfaces 21 and 210)
As shown in the front view of FIG. 11, the emission surface 20 of the inner lens 2 is divided into a plurality of (about 3500 in this example) minute emission surfaces (segments) 21 and 210. The number of minute exit surfaces 21 and 210 is not particularly limited.

The plurality of minute exit surfaces 21 and 210 each have a polygonal shape and form a flat surface. Further, a punching surface for die cutting is provided at the boundary between the adjacent minute ejection surfaces 21 and 210. This punched surface is also made of a flat surface like the minute exit surfaces 21 and 210. The punched surface is inclined with an arbitrary degree of punching.

The width dimension of the front view of the minute exit surfaces 21 and 210 is about 2 mm to about 5 mm in this example. Further, the height dimension of the minute exit surfaces 21 and 210 is about 0.1 mm to about 0.5 mm in this example. The width dimension of the front view of the punched surface is about 0.1 mm to about 0.3 mm in this example. As a result, when the punched surface is viewed from the front, it appears as a line, that is, a ridge line, as shown in FIG. Due to the width dimension and the height dimension, the minute exit surface 21, 210 and the punched surface are formed on the exit surface 20 of the inner lens 2 to be injection-molded. The dimensions of the minute exit surfaces 21 and 210 are not particularly limited.

The plurality of minute emission surfaces 21, 210 each have the emitted light L3 as a plurality of aiming points P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11 in the light distribution. Among P12, P13, P14, P15, P16, P17, P18, and P19 (hereinafter, simply referred to as "P1 to P19"), the light is emitted toward a predetermined aiming point.

The plurality of aiming points P1 to P19 include at least 19 photometric points in the measurement of light distribution characteristics (see the light distribution table shown in FIG. 12 below), and in this example, 19 photometric points. And. The plurality of minute emission surfaces 21 and 210 are assigned to the 19 photometric measurement points P1 to P19 at a predetermined ratio, respectively. That is, the number of the minute emission surfaces 21 and 210 that emit the emitted light L3 to the predetermined luminous intensity measurement point is allocated at a predetermined ratio. This predetermined ratio is a ratio according to the ratio of the minimum luminosity required at the 19 photometric measurement points P1 to P19.

(Explanation of light distribution)
Here, the luminous intensity measuring point of the light distribution characteristic of the tail lamp function or the luminous intensity measuring point of the light distribution characteristic of the stop lamp function will be described with reference to the light distribution table of FIG. The light distribution table shown in FIG. 12 has 19 luminous intensity measuring points P1 to P19 as shown below.

P1 is a point at 5 ° on the left (L) and 10 ° on the top (U).
P2 is a point on the right (R) 5 ° and on the top (U) 10 °.
P3 is a point at 20 ° on the left (L) and 5 ° on the top (U).
P4 is a point at 10 ° on the left (L) and 5 ° on the top (U).
P5 is a point of 0 ° on the left and right (HL-HR) and 5 ° on the top (U).
P6 is a point on the right (R) 10 ° and on the top (U) 5 °.
P7 is a point on the right (R) 20 ° and on the top (U) 5 °.
P8 is a point of 10 ° on the left (L) and 0 ° on the top and bottom (VU-VD).
P9 is a point of 5 ° on the left (L) and 0 ° on the top and bottom (VU-VD).
P10 is a point of 0 ° left and right (HL-HR) and 0 ° up and down (VU-VD).
P11 is a point on the right (R) of 5 ° and up and down (VU-VD) of 0 °.
P12 is a point on the right (R) of 10 ° and up and down (VU-VD) of 0 °.
P13 is a point at 20 ° on the left (L) and 5 ° on the bottom (D).
P14 is a point at 10 ° on the left (L) and 5 ° on the bottom (D).
P15 is a point of 0 ° on the left and right (HL-HR) and 5 ° on the bottom (D).
P16 is a point on the right (R) of 10 ° and on the bottom (D) of 5 °.
P17 is a point at 20 ° on the right (R) and 5 ° on the bottom (D).
P18 is a point at 5 ° on the left (L) and 10 ° on the bottom (D).
P19 is a point at 5 ° on the right (R) and 10 ° on the bottom (D).

The ratio (%) of the minimum luminous intensity of each luminous intensity measuring points P1 to P19 when the minimum luminous intensity of the luminous intensity measuring points P10 is 100% is as follows. The ratio (%) of the minimum luminous intensity below is a numerical value based on the regulations of Japan and Europe. Therefore, in the United States, the following minimum luminous intensity percentages (%) are different.
P1 is 20%.
P2 is 20%.
P3 is 10%.
P4 is 20%.
P5 is 70%.
P6 is 20%.
P7 is 10%.
P8 is 35%.
P9 is 90%.
P10 is 100%.
P11 is 90%.
P12 is 35%.
P13 is 10%.
P14 is 20%.
P15 is 70%.
P16 is 20%.
P17 is 10%.
P18 is 20%.
P19 is 20%.

Further, the minimum luminous intensity of each luminous intensity measuring point P1 to P19 in the light distribution of the tail lamp function is as follows. The unit is candela (cd).
P1 is 0.8cd (Japan, Europe), 0.4cd (US).
P2 is 0.8cd (Japan, Europe), 0.4cd (US).
P3 is 0.4cd (Japan, Europe), 0.3cd (US).
P4 is 0.8cd (Japan, Europe), 0.4cd (US).
P5 is 2.8cd (Japan, Europe), 0.8cd (USA).
P6 is 0.8cd (Japan, Europe), 0.4cd (US).
P7 is 0.4cd (Japan, Europe), 0.3cd (US).
P8 is 1.4cd (Japan, Europe), 0.8cd (US).
P9 is 3.6cd (Japan, Europe), 1.8cd (USA).
P10 is 4.0cd (Japan, Europe), 2.0cd (US).
P11 is 3.6cd (Japan, Europe), 1.8cd (USA).
P12 is 1.4cd (Japan, Europe), 0.8cd (US).
P13 is 0.4cd (Japan, Europe), 0.3cd (US).
P14 is 0.8cd (Japan, Europe), 0.4cd (US).
P15 is 2.8cd (Japan, Europe), 0.8cd (US).
P16 is 0.8cd (Japan, Europe), 0.4cd (US).
P17 is 0.4cd (Japan, Europe), 0.3cd (US).
P18 is 0.8cd (Japan, Europe), 0.4cd (US).
P19 is 0.8cd (Japan, Europe), 0.4cd (US).

Furthermore, the minimum luminous intensity of each luminous intensity measuring points P1 to P19 in the light distribution of the stop lamp function is as follows. The unit is candela (cd).
P1 is 12cd (Japan, Europe), 16cd (USA).
P2 is 12cd (Japan, Europe), 16cd (USA).
P3 is 6cd (Japan, Europe), 10cd (US).
P4 is 12cd (Japan, Europe), 16cd (USA).
P5 is 42cd (Japan, Europe), 40cd (USA).
P6 is 12cd (Japan, Europe), 16cd (USA).
P7 is 6cd (Japan, Europe), 10cd (USA).
P8 is 21cd (Japan, Europe), 30cd (USA).
P9 is 54cd (Japan, Europe), 70cd (USA).
P10 is 60cd (Japan, Europe), 80cd (USA).
P11 is 54cd (Japan, Europe), 70cd (USA).
P12 is 21cd (Japan, Europe), 30cd (US).
P13 is 6cd (Japan, Europe), 10cd (USA).
P14 is 12cd (Japan, Europe), 16cd (USA).
P15 is 42cd (Japan, Europe), 40cd (USA).
P16 is 12cd (Japan, Europe), 16cd (USA).
P17 is 6cd (Japan, Europe), 10cd (USA).
P18 is 12cd (Japan, Europe), 16cd (USA).
P19 is 12cd (Japan, Europe), 16cd (USA).

Then, based on the ratio of the minimum luminous intensity at the 19 luminous intensity measurement points P1 to P19, the plurality of (about 3500 in this example) minute exit surfaces 21, 210 are respectively as follows. , Will be allocated.
P1 is 20/690 (the sum of the ratios of the minimum luminosity at the above 19 photometric measurement points P1 to P19. The same applies hereinafter) × about 3500.
P2 is 20/690 x about 3500 pieces.
P3 is 10/690 x about 3500 pieces.
P4 is 20/690 x about 3500 pieces.
P5 is 70/690 x about 3500 pieces.
P6 is 20/690 x about 3500 pieces.
P7 is 10/690 x about 3500 pieces.
P8 is 35/690 x about 3500 pieces.
P9 is 90/690 x about 3500 pieces.
P10 is 100/690 x about 3500 pieces.
P11 is 90/690 x about 3500 pieces.
P12 is 35/690 x about 3500 pieces.
P13 is 10/690 x about 3500 pieces.
P14 is 20/690 x about 3500 pieces.
P15 is 70/690 x about 3500 pieces.
P16 is 20/690 x about 3500 pieces.
P17 is 10/690 x about 3500 pieces.
P18 is 20/690 x about 3500 pieces.
P19 is 20/690 x about 3500 pieces.

(Explanation of formation of minute exit surfaces 21 and 210)
The plurality of minute exit surfaces 21 and 210 are each distributed based on a low discrepancy sequence (super-uniform distribution sequence, low-discrepancy sequence, quasi-random number sequence). Here, the low-discrepancy sequence is not a "random number" but a low-discrepancy sequence, as opposed to the Monte Carlo method, which is a method for performing simulations and numerical calculations using "random numbers". Refers to a method for performing simulations and numerical calculations (also called quasi-Monte Carlo method or quasi-random numbers). Calculations and simulations based on such a low difference quantity sequence are performed by using the emission surface shape determining device 100 configured by a computer. Specifically, the exit surface shape determining device 100 has a configuration as shown in FIG.

Then, based on the three-dimensional data created by the exit surface shape determining device 100, the mold 300 is manufactured by the mold processing device 200 as shown in FIG. Using such a mold 300, the inner lens 2 of this embodiment is formed by, for example, injection molding.

Hereinafter, the exit surface shape determining device 100 will be described with reference to FIG. The emission surface shape determining device 100 includes a memory 120 such as a CPU (Central Processing Unit) 110, a RAM (Random Access Memory), a ROM (Read Only Memory), and a non-volatile memory, and is a GPU (Graphics) for performing image processing. Processing Unit) 130 is preferably provided. Further, the exit surface shape determining device 100 includes a data output unit 140 for transmitting / receiving data from an external device and outputting the formed emission surface shape data.

The emission surface shape determination device 100 calculates the shape data determination program stored in the memory 120 and the shape calculation data by the CPU 110 and the GPU 130, so that the shape of the emission surface 20 of the inner lens 2 as a reference can be obtained. Based on the data and the incident direction data of the light at each portion with respect to the shape data of the emission surface 20, the emission surface shape data formed from the minute emission surface shape data of the plurality of minute emission surfaces 21 is formed.

The emission surface shape data created at this time is determined by an operation based on a low difference quantity sequence. Then, the created exit surface shape data is output from the data output unit 140 to an external device. The data output unit 140 may be a connection unit connected to a portable memory, or may be a communication unit that communicates by wire or wirelessly.

Further, the external device may be a portable memory, and the emission surface shape data stored in such a memory may be read by the control unit of the mold processing apparatus 200. Further, when the above-mentioned external device is the mold processing apparatus 200, the control unit of the mold processing apparatus 200 directly receives the emission surface shape data from the data output unit 140 and converts the emission surface shape data into the emission surface shape data. Based on this, the mold processing apparatus 200 processes the mold. Then, the inner lens 2 having the exit surface 20 as in the present embodiment is formed by, for example, injection molding by the mold 300 created by the mold processing apparatus 200.

Hereinafter, the details of the plurality of minute emission surfaces 21 and 210 will be described. However, when the emission surface 20 having the minute emission surfaces 21 and 210 is actually produced by injection molding with the mold 300, the manufacturing error and the like are excluded. The actual emission surface 20 and the minute emission surfaces 21, 210 generally correspond to, for example, the minute emission surface shape data and the emission surface shape data of three-dimensional data. Therefore, in the following description, the actual emission surface 20 can be regarded as corresponding to the emission surface shape data, and the actual minute emission surfaces 21 and 210 correspond to the minute emission surface shape data. Can be regarded as.

The plurality of minute exit surfaces 21 and 210 (corresponding to the minute exit surface shape data; the same applies hereinafter) each have a polygonal shape and form a plane. Hereinafter, the formation of the minute exit surfaces 21 and 210 (corresponding to the minute exit surface shape data; the same applies hereinafter) will be described with reference to FIGS. 13 to 18.

The plurality of micro-exit surfaces 21 and 210 have angles θX and θY for tilting the reference micro-emission surface 22 forming a plane in a regular hexagonal shape, and directions X1 for shifting the mother point C which is the center of the reference micro-emission surface 22, respectively. The amount TX for shifting the mother point C of the minute emission surface 22 and the amount TZ for pushing out the reference minute emission surface 22 are determined based on the low discrepancy amount sequence. The reference microexit surface 22 forming a flat surface does not necessarily have to be a regular hexagonal flat surface as in this example. For example, it may be triangular, pentagonal, or icosagonal or larger. Further, the parameters determined based on the low discrepancy amount sequence do not have to be all of the tilt angles θX and θY, the direction X1 for shifting the mother point C, the amount TX for shifting the mother point C, and the protruding amount TZ. That is, at least one of these four parameters may be determined based on the low discrepancy quantity sequence.

First, as shown in FIGS. 13 (A) and 17, a plurality of emission surfaces 20 (corresponding to emission surface shape data; the same shall apply hereinafter) having a regular hexagonal shape and forming a plane (about 3500 in this example). Each of the reference micro-exiting surfaces 22 is divided. Next, the plurality of reference micro-emitting surfaces 22 are each aimed at a plurality of aiming points in the light distribution, that is, a predetermined luminous intensity measuring point among the 19 luminous intensity measuring points P1 to P19 ( Aim) and tilt.

For example, as shown in FIGS. 13 (B) and 14 (A), the optical axis Z1 of the reference micro emission surface 22 is the optical axis of the reference micro emission surface 22 before being tilted about the origin on the XZ surface. Tilt downward at an angle θX with respect to Z (Z axis). Further, as shown in FIGS. 13 (B) and 14 (B), the optical axis Z1 of the reference micro emission surface 22 is the optical axis of the reference micro emission surface 22 before being tilted about the origin on the YZ surface. Tilt to the right with respect to Z (Z axis) at an angle θY. The ratio of the number of the plurality of reference micro-exiting surfaces 22 aimed at the 19 photometric measurement points P1 to P19 and tilted is as described above.

Then, as shown in FIG. 15 (A), the direction X1 for shifting the mother point C of the reference minute exit surface 22 is set at an angle θ to the right (clockwise) with respect to the X axis with the origin as the center on the XY plane. Decide by shifting. Further, as shown in FIG. 15B, the mother point C of the reference microexit surface 22 is shifted by the amount (distance) TX from the origin on the shifting direction X1. As a result, as shown in FIG. 17, the mother points of the plurality of reference micro-exit surfaces 22 are the mother points of the reference micro-exit surface 22 after being shifted from the mother point C of the reference micro-exit surface 22 before being shifted. (The mother point of the minute exit surface 21) It shifts to C1.

Subsequently, the reference micro-exit surface 22 (corresponding to the reference micro-emission surface 22 shown by the solid line in FIGS. 14 (A) and 14 (B)) shown by the two-dot chain line in FIGS. 16 (A) and 16 (B). It protrudes from the origin by the amount (distance) TZ on the optical axis Z1 of the reference minute emission surface 22 after being tilted. As a result, as shown by the solid line in FIGS. 16A and 16B, the reference microexit surface 22 protrudes later.

As described above, a plurality of reference minute pieces tilted at predetermined angles θX and θY, the mother point C is shifted by a predetermined amount TX on a predetermined direction X1, and further, a predetermined amount TZ is projected. Voronoi division is performed on the exit surface 22 (see FIG. 17) based on the shifted mother point C1. As a result, as shown in FIG. 18, a plurality of minute exit surfaces 21, 210 (micro emission surface shape data) are formed, and the emission having the plurality of minute exit surfaces 21, 210 (micro emission surface shape data) is formed. The surface 20 (exit surface shape data) is formed.

When the mold 300 is processed by the mold processing apparatus 200 based on the emission surface shape data having the plurality of minute emission surface shape data as described above, the plurality of minute emission surfaces 21 and 210 as actual objects are obtained. An inner lens 2 having an exit surface 20 is formed.

(Explanation of predetermined angle θ1)
As shown in FIG. 6, at least a part 21 of the plurality of minute exit surfaces 21 and 210 is inclined with respect to the basic surface 23 at a predetermined angle θ1 or less. The predetermined angle θ1 is the angle difference between the normal line H1 of the minute exit surface 21 and the normal line H2 of the basic surface 23. Here, the basic surface 23 is the surface 24 (exit surface 20) of the inner lens 2 before the minute emission surfaces 21 and 210 are provided. Therefore, the basic surface 23 does not exist in the inner lens 2 provided with the minute emission surfaces 21 and 210.

The predetermined angle θ1 is about 2 minutes of the brightness on the emission surface 20 of the inner lens 2 (hereinafter referred to as “normal brightness”) when the plurality of minute emission surfaces 21 and 210 are not provided. An angle of 1 or more (see FIGS. 7 and 8). The predetermined angle θ1 is about 17 degrees (see FIGS. 9 and 10).

FIG. 7 shows the diffusion angle of the emitted light L3 on the minute emission surfaces 21 and 210 when the inner lens 2 is made of PMMA (acrylic) (hereinafter referred to as “diffusion angle of the minute emission surfaces 21 and 210”). It is explanatory drawing which shows the relative relationship with a luminance ratio. FIG. 8 is an explanatory diagram showing the relative relationship between the diffusion angle and the brightness ratio of the minute exit surfaces 21 and 210 when the inner lens 2 is composed of a PC (polycarbonate).

Here, the diffusion angles of the minute emission surfaces 21 and 210 are the front direction (parallel to the normal H2 direction of the basic surface 23) of the inner lens 2 (vehicle lighting tool 1) and the emission light L3 from the minute emission surfaces 21 and 210. Is the angle between the emission direction and the emission direction of.

In FIGS. 7 and 8, the basis for setting the brightness of the exit surface 20 of the inner lens 2 to about half or more of the normal brightness is the light distribution characteristic of the tail lamp function or the light distribution characteristic of the stop lamp function. It is based on the conditions necessary to satisfy.

Further, in FIGS. 7 and 8, the solid line indicates the measured value. The alternate long and short dash line shows the numerical values when the minute emission surfaces 21 and 210 are not provided. The wavy line shows a value that is half of the value when the minute emission surfaces 21 and 210 are not provided.

As is clear from FIGS. 7 and 8, when the inner lens 2 is made of PMMA (acrylic), the brightness ratio is about 2 when the diffusion angle of the minute exit surfaces 21 and 210 is about 6.5 degrees or less. It will be more than one-third. Further, when the inner lens 2 is composed of a PC (polycarbonate) and the diffusion angle of the minute exit surfaces 21 and 210 is about 8 degrees or less, the brightness ratio becomes about half or more.

FIG. 9 is an explanatory diagram showing the relative relationship between the diffusion angle and the normal angle difference of the minute exit surfaces 21 and 210 when the inner lens 2 is made of PMMA (acrylic). FIG. 10 is an explanatory diagram showing the relative relationship between the diffusion angle and the normal angle difference of the minute exit surfaces 21 and 210 when the inner lens 2 is composed of a PC (polycarbonate).

In FIGS. 9 and 10, since the diffusion angles of the minute exit surfaces 21 and 210 cannot be measured, the angle difference between the measurable normal line H1 of the minute exit surface 21 and the normal line H2 of the basic surface 23 (that is, that is). The predetermined angle θ1) shown in FIG. 6 is calculated.

The specific measured values in FIGS. 9 and 10 are measured for a plurality of minute exit surfaces 21 and 210, and the mean value + standard deviation × 2 (about 95% of the total falls within this numerical value range) is statistically measured. It is a value calculated in.

As is clear from FIGS. 9 and 10, when the inner lens 2 is made of PMMA (acrylic), the normal angle difference (that is, the figure) at a diffusion angle of about 6.5 degrees between the minute exit surfaces 21 and 210 is shown. The predetermined angle θ1) shown in 6 is about 16.98 degrees. Further, when the inner lens 2 is composed of a PC (polycarbonate), the normal angle difference (that is, the predetermined angle θ1 shown in FIG. 6) at a diffusion angle of about 8 degrees between the minute exit surfaces 21 and 210 is about. It is 17.38 degrees.

As a result, when the normal angle difference (that is, the predetermined angle θ1 shown in FIG. 6) is about 17 degrees or less, it becomes about half or more of the normal luminance. As a result, the predetermined angle θ1 to be tilted with respect to the basic surface 23 on at least a part 21 of the plurality of minute exit surfaces 21 and 210 is about 17 degrees at the maximum.

The plurality of minute exit surfaces 21 inclined at a predetermined angle θ1 or less with respect to the basic surface 23 are at least about 60% or more of the total of the plurality of minute exit surfaces 21 and 210. Therefore, the plurality of minute exit surfaces 21 inclined at a predetermined angle θ1 or less with respect to the basic surface 23 may be the entire plurality of minute exit surfaces, that is, 100.

(Explanation of operation of embodiment)
The vehicle lamp 1 and the inner lens 2 according to this embodiment have the above-mentioned configurations, and their actions will be described below.

Electric power (current) is supplied to the light emitting element of the light source 5 to light and light the light emitting element. Then, the light L1 emitted from the light emitting element is incident on the inside of the inner lens 2 from the incident surface 280 of the incoming light portion 28 of the inner lens 2.

The light L1 incident on the inside of the inner lens 2 is propagated from the incoming light portion 28 of the inner lens 2 to the light emitting portion 29 by the total reflection action inside the inner lens 2. A part of the light L1 propagating inside the inner lens 2 is reflected to the front surface 24 side as the reflected light L2 by the reflecting surface 26 on the back surface 25 side. A part of the reflected light L2 is emitted to the outside from a plurality of minute emission surfaces 21 and 210 of the emission surface 20 as the emission light L3.

As a result, red light is emitted from the vehicle lighting tool 1 and the inner lens 2 according to this embodiment to the rear of the vehicle to obtain a predetermined light distribution, that is, a light distribution of a tail lamp function or a light distribution of a stop lamp function. Be done.

(Explanation of the effect of the embodiment)
The vehicle lamp 1 and the inner lens 2 according to this embodiment have the above-mentioned configurations and actions, and the effects thereof will be described below.

Since the inner lens 2 according to this embodiment is obtained by dividing the emission surface 20 of the surface 24 into a plurality of minute emission surfaces 21 and 210, the plurality of minute emission surfaces 21 and 210 can be used from the emission surface 20. The emitted light L3 can be diffused in multiple directions and emitted. As a result, the light emitting surface 20 of the surface 24 of the vehicle lamp 1 and the inner lens 2 according to this embodiment can emit light uniformly.

In particular, the inner lens 2 according to this embodiment is provided on the back surface 25 because the emitted light L3 is diffused in multiple directions and emitted from the plurality of minute exit surfaces 21 and 210 of the emission surface 20 of the surface 24. The boundary line (boundary portion) between the reflecting surface 26 and the connecting surface 27 can be made difficult to see. Thereby, the vehicle lamp 1 and the inner lens 2 according to this embodiment can improve the appearance of the front view.

Moreover, in the inner lens 2 according to this embodiment, a high-luminance feeling (glittering feeling) can be obtained by the plurality of minute exiting surfaces 21 and 210 on the emitting surface 20 of the surface 24.

Since the inner lens 2 according to this embodiment has at least a part 21 of the plurality of minute exit surfaces 21 and 210 tilted with respect to the basic surface 23 at a predetermined angle θ1 or less, the reflected light L2. A part of the light can be emitted to the outside from the plurality of minute emission surfaces 21 and 210 of the emission surface 20, and the rest of the reflected light L2 can be reflected back to the inside of the inner lens 2. As a result, in the vehicle lighting tool 1 and the inner lens 2 according to this embodiment, the light L1 incident on the inside of the inner lens 2 from the incident surface 280 of the light input portion 28 of the inner lens 2 is completely collected inside the inner lens 2. Due to the reflection action, the light can be efficiently propagated from the entrance portion 28 of the inner lens 2 to the light emitting portion 29, so that the emission surface 20 of the surface 24 can emit light uniformly.

Since the inner lens 2 according to this embodiment is an angle difference between the normal line H1 of the minute exit surface 21 and the normal line H2 of the basic surface 23 where a predetermined angle θ1 can be measured, the angle difference is relative to the basic surface 23. It is possible to surely form the minute exit surface 21 inclined at a predetermined angle θ1 or less. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can improve the propagation efficiency of the light L1 inside the inner lens 2, so that the emission surface 20 of the surface 24 emits light uniformly. can.

In the inner lens 2 according to this embodiment, the predetermined angle θ1 is about half or more of the brightness on the emission surface 20 when the plurality of minute emission surfaces 21 and 210 are not provided. The angle. Thereby, the vehicle lighting tool 1 and the inner lens 2 according to this embodiment can satisfy the light distribution characteristic of the tail lamp function or the light distribution characteristic of the stop lamp function, and the emission surface 20 of the surface 24 is formed. It can emit light uniformly.

Since the inner lens 2 according to this embodiment has a predetermined angle θ1 of about 17 degrees, the minute emission surface 21 can be reliably formed, so that the emission surface 20 can emit light uniformly.

In the inner lens 2 according to this embodiment, the plurality of minute exit surfaces 21 inclined at a predetermined angle θ1 or less with respect to the basic surface 23 have the plurality of minute exit surfaces 21 and 210 with respect to the whole. It is about 60% or more. Thereby, the vehicle lighting tool 1 and the inner lens 2 according to this embodiment can satisfy the light distribution characteristic of the tail lamp function or the light distribution characteristic of the stop lamp function, and the emission surface 20 of the surface 24 is formed. It can emit light uniformly.

In the inner lens 2 according to this embodiment, among the plurality of minute emission surfaces 21 and 210, the plurality of minute emission surfaces 21 inclined at least at a predetermined angle θ1 or less with respect to the basic surface 23 are low. Since the distribution is based on the discrepancy quantity sequence, the minute emission surfaces 21 having the same emission direction of the emitted light L3 are distributed in a state of being scattered without being adjacent to each other. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can make the emission surface 20 emit light uniformly, and a high-luminance glittering feeling can be obtained.

In the inner lens 2 according to this embodiment, since the plurality of minute emission surfaces 21 and 210 each have a polygonal shape and form a plane, refraction control is easy and higher than the emission surface having a curved surface. Accurate refraction control is obtained, and the manufacturing cost is low.

In the inner lens 2 according to this embodiment, the plurality of minute emission surfaces 21 and 210 have angles θX and θY at which the reference minute emission surface 22 forming a plane in a regular hexagonal shape is tilted, respectively, at the center of the reference minute emission surface 22. The direction X1 for shifting a certain mother point C, the amount TX for shifting the mother point C, and the amount TZ for pushing out the reference microexit surface 22 are determined based on the low discrepancy amount sequence. As a result, in the vehicle lamp 1 and the inner lens 2 according to this embodiment, a plurality of minute exit surfaces 21 and 210 can be easily and surely molded on the emission surface 20 of the injection-molded inner lens 2. .. Moreover, in the vehicle lamp 1 and the inner lens 2 according to this embodiment, since the plurality of minute emission surfaces 21 and 210 are formed based on the low stagger amount sequence as described above, the emission surface 20 is made to emit light uniformly. Moreover, a high-brightness glittering feeling can be obtained.

In the inner lens 2 according to this embodiment, the emitted light L3 emitted to the outside from the emitting surface 20 forms the light distribution of the tail lamp function or the light distribution of the stop lamp function. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can obtain a tail lamp function or a stop lamp function that can satisfy the light distribution characteristics.

The inner lens 2 according to this embodiment is made of acrylic or polycarbonate. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can be manufactured at low cost.

The inner lens 2 according to this embodiment has a reflective surface of a first inner housing portion 61 arranged at least on the back surface 25 side to reflect light emitted from the inner lens 2 to the inside of the inner lens 2. Is. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can re-enter the light leaked from the inner lens 2 into the inner lens 2 to effectively utilize the light of the light source 5.

The inner lens 2 according to this embodiment forms a plurality of minute exit surfaces 21 and 210 in a plurality of light distributions, in this example, 19 aiming points, that is, luminosity measuring points P1 to P19. Is. As a result, in the vehicle lighting tool 1 and the inner lens 2 according to this embodiment, the plurality of minute emission surfaces 21 and 210 allow the light emitted from the plurality of minute emission surfaces 21 and 210 to be emitted from the plurality of minute emission surfaces 21 and 210 in the light distribution. It can be emitted to a luminous intensity measuring point having a predetermined aim among 19 luminous intensity measuring points P1 to P19. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can obtain a high-luminance feeling (glittering feeling) on the emission surface 20.

In the inner lens 2 according to this embodiment, a plurality of minute emission surfaces 21 and 210 are assigned to 19 luminous intensity measurement points P1 to P19 at a predetermined ratio, and the predetermined ratio is 19 luminous intensity measurements. It is a ratio according to the ratio of the minimum luminous intensity required at points P1 to P19. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment can surely obtain a predetermined light distribution even if the emission surface 20 is divided into a plurality of minute emission surfaces 21 and 210.

The inner lens 2 according to this embodiment has a plurality of minute exit surfaces 21 and 210 formed on the exit surface 20 of the surface 24 of the inner lens 2. As a result, the vehicle lamp 1 and the inner lens 2 according to this embodiment specify the light L3 emitted from the plurality of minute emission surfaces 21 and 210 among the 19 luminous intensity measurement points P1 to P19 in the light distribution. It can be refracted with high accuracy and emitted to the luminous intensity measurement point where the aim of the lens is set.

(Explanation of modified examples of vehicle lamps)
FIG. 20 shows a modified example of the vehicle lamp according to the present invention. Hereinafter, the vehicle lamp 1A of this modification will be described. In the figure, the same reference numerals as those in FIGS. 1 to 19 indicate the same substances.

As shown in FIG. 1, the vehicle lamp 1 according to the above embodiment is provided with an opening 36 having a horizontally long substantially rectangular shape in the second housing portion 32 of the housing 3. On the other hand, the vehicle lamp 1A of this modification is provided with an opening 360 composed of three horizontal lines and one vertical line in the second housing portion 320 of the housing 3A.

In the vehicle lighting tool 1A of this modification, the inner lens 2 according to the above embodiment used for the vehicle lighting tool 1 according to the above embodiment is used.

As a result, the vehicle lamp 1A of this modification can achieve the same effect as the vehicle lamp 1 of the above-described embodiment. In particular, since the vehicle lamp 1A of this modification uses the second housing portion 320 as a mask (shield) that covers a part of the emission surface 20 of the inner lens 2, the shape of the opening 360 is used. By changing to an arbitrary shape, the light emitting surface of the emission surface 20 of the inner lens 2 can be changed to an arbitrary shape. For example, a light emitting surface such as a character such as initials or a mark can be obtained.

(Explanation of the configuration, action, and effect of a modified example of the inner lens of a vehicle lamp)
21 and 22 show a modified example of the inner lens of the vehicle lamp according to the present invention. Hereinafter, the inner lens 2A of this modified example will be described. In the figure, the same reference numerals as those in FIGS. 1 to 20 indicate the same product.

The inner lens 2 according to the above embodiment has a plate shape. On the other hand, the inner lens 2A of this modification has a round bar shape with a circular cross section.

As a result, the inner lens 2A of this modification can achieve the same effect as the inner lens 2 according to the above embodiment. In particular, since the inner lens 2A of this modification has a round bar shape with a circular cross section, the emission surface 20, that is, the light emitting surface of the inner lens 2A has a linear shape. As a result, the inner lens 2A of the modified example is most suitable for use in the vehicle lamp 1A of the modified example having the housing 3A of the second housing portion 320 in which the opening 360 has a linear shape.

(Explanation of Examples other than the Embodiment and the Modified Example)
In the above-described embodiment and modification, any one of the tail lamp, the stop lamp, and the tail stop lamp constituting the rear combination lamp will be described. However, in the present invention, it can be applied to lamps other than the above-mentioned lamps. For example, a turn signal lamp at the rear of the vehicle, or a rear fog lamp. In the case of a lamp other than the above-mentioned lamp, the color of the lamp lens is other than red, for example, orange, yellow, white, or the like.

Further, in the above-described embodiment and modification, the number of minute exit surfaces 21 and 210 of the inner lenses 2 and 2A is about 3,500. However, in the present invention, the number of the minute exit surfaces 21 and 210 is not particularly limited as long as the minute exit surfaces 21 and 201 can be molded when the inner lenses 2 and 2A are injection-molded.

Further, in the above-described embodiment and modification, all of the plurality of minute exit surfaces 21 and 210 are distributed based on the low stagger amount sequence, respectively. However, in the present invention, among the plurality of minute exit surfaces 21 and 210, the plurality of minute exit surfaces 21 inclined at least at a predetermined angle θ1 or less with respect to the basic surface 23 each have a low amount of discrepancy. It may be distributed based on a column.

Furthermore, in the above-described embodiments and modifications, an example of the inner lens 2 made of PMMA (acrylic) or PC (polycarbonate) will be described. However, in the present invention, the inner lens 2 may be made of a light-transmitting resin material other than PMMA (acrylic) or PC (polycarbonate).

Furthermore, in the above-described embodiment and modification, a light source having a light emitting element is used as the light source 5. However, in the present invention, as the light source, a light source having a light output larger than that of the light emitting element may be used.

When this large amount of light source is used, the maximum luminous intensity required at the luminous intensity measuring points P1 to P19 of the light distribution may be exceeded. Therefore, the aiming points defined by the plurality of minute exit surfaces 21 and 210 as the aiming points are added to the 19 photometric measurement points P1 to P19, and a plurality of aiming points are further added as auxiliary aiming points. As a result, the luminosity at the 19 luminosity measurement points P1 to P19 (luminous intensity exceeding the required maximum luminosity) is dispersed around the luminosity measurement points, stays within the required maximum luminosity, and is required. It is possible to obtain a luminous intensity higher than the minimum luminous intensity. The auxiliary aiming points are provided at equal pitches of 1.25 ° with respect to the 19 photometric measurement points P1 to P19. However, the pitch of the auxiliary aiming points may be a pitch other than 1.25 °, or may be an unequal pitch.

When this large amount of light source is used and an auxiliary aiming point is provided, the auxiliary aiming points are increased with respect to the 19 luminous intensity measuring points P1 to P19 of the inner lenses 2 and 2A. Therefore, the luminous intensity between the 19 luminous intensity measuring points P1 to P19 of the light distribution changes smoothly, and the light distribution that is easy on the eyes can be obtained.

The present invention is not limited to the above embodiment. For example, numerical values in the positions of the photometric measurement points P1 to P19, the ratio (%) of the minimum luminous intensity of each luminous intensity measurement points P1 to P19, the minimum luminous intensity of each luminous intensity measurement points P1 to P19, and the number of minute emission surfaces 21 and 210 to be allocated. Is not limited to the above numerical values. That is, the above numerical values are examples, and are not limited, and are arbitrary.

1, 1A Vehicle lamp 2, 2A Inner lens 20 Emission surface 21 Micro emission surface (micro emission surface inclined at a predetermined angle or less with respect to the basic surface 23)
210 Micro-exit surface (micro-exit surface other than the micro-exit surface that is inclined at a predetermined angle or less with respect to the basic surface 23)
22 Reference micro emission surface 23 Basic surface 24 Surface 25 Back surface 26 Reflection surface 27 Connecting surface 28 Incoming surface 280 Incident surface 29 Light emitting part 3, 3A Housing (lamp housing)
31 1st housing part 32 2nd housing part 33 Opening part 34 Closing part 35 Mounting hole 36 Opening part 37 Convex part 38 Wall part 39 Cover part 4 Outer lens 40 Light chamber 5 Light source 50 Cylindrical part 51 Flange part 52 Fin part 6 Inner Housing 61 1st inner housing part 62 2nd inner housing part 100 Emission surface shape determining device 110 CPU
120 memory 130 GPU
140 Data output unit 200 Mold processing device 300 Mold C Reference microrefraction plane 22 base point C1 Micro emission surface 21 mother point HL-HR Left and right horizontal lines in the light distribution table H1 Normal of the minute emission surface 21 H2 Basic Normal of surface 23 L1 light L2 reflected light L3 emitted refracted light P1 to P19 aiming point (luminance measurement point)
TX Amount to shift the base point C of the reference micro exit surface 22 TZ Amount to protrude the reference micro exit surface 22 VU-VD Vertical lines above and below the light distribution table X X axis X1 Direction to shift the base point C of the reference micro exit surface 22 Y Y-axis ZZ-axis (optical axis of reference micro-exit surface 22 before tilting)
Optical axis of Z1 micro-exit surface 21 (optical axis of reference micro-exit surface 22 after tilting)
θ Angle at which the base point C of the reference micro-exit surface 22 is shifted θ1 Predetermined angle θX Angle at which the reference micro-emission surface 22 is tilted θY Angle at which the reference micro-emission surface 22 is tilted

Claims (12)

It is an inner lens of a vehicle lamp that propagates light by total internal reflection.
A plurality of reflective surfaces provided on the back surface and reflecting a part of the light propagating inside the surface to the front surface side as reflected light.
An emission surface provided on the surface and emitting a part of the reflected light to the outside as emission light.
Have,
The emission surface is divided into a plurality of minute emission surfaces.
At least a part of the plurality of minute exit surfaces is inclined at a predetermined angle or less with respect to the basic surface.
An inner lens for vehicle lighting that is characterized by this. The predetermined angle is the angle difference between the normal of the minute exit surface and the normal of the basic surface.
The inner lens of a vehicle lamp according to claim 1. The predetermined angle is an angle at which the brightness on the emission surface is about one half or more of the brightness on the emission surface when the plurality of minute emission surfaces are not provided.
The inner lens of a vehicle lamp according to claim 1 or 2. The predetermined angle is about 17 degrees.
The inner lens of a vehicle lamp according to any one of claims 1 to 3, wherein the inner lens is characterized by the above. The plurality of the minute exit surfaces inclined at a predetermined angle or less with respect to the basic surface are about 60% or more of the total of the plurality of the minute exit surfaces.
The inner lens of a vehicle lamp according to any one of claims 1 to 4, wherein the inner lens is characterized by the above. Among the plurality of the minute emission surfaces, the plurality of the minute emission surfaces inclined at least at least the predetermined angle with respect to the basic surface are distributed based on the low discrepancy quantity sequence.
The inner lens of a vehicle lamp according to any one of claims 1 to 5, wherein the inner lens is characterized by the above. Of the plurality of micro-exit surfaces, the plurality of micro-emission surfaces inclined at least at least at a predetermined angle or less with respect to the basic surface each form a flat surface in a polygonal shape.
The inner lens of a vehicle lamp according to any one of claims 1 to 6, wherein the inner lens is characterized by the above. Among the plurality of the minute emission surfaces, the plurality of the minute emission surfaces inclined at least at least by the predetermined angle or less with respect to the basic surface are the angles at which the reference minute emission surface forming a plane is tilted, the reference. At least one of the direction of shifting the mother point, which is the center of the minute emission surface, the amount of shifting the mother point, and the amount of pushing out the reference minute emission surface is determined based on the low discrepancy amount sequence.
The inner lens of a vehicle lamp according to any one of claims 1 to 7, wherein the inner lens is characterized by the above. The emitted light emitted to the outside from the emitting surface forms a light distribution of a tail lamp function or a light distribution of a stop lamp function.
The inner lens of a vehicle lamp according to any one of claims 1 to 8, wherein the inner lens is characterized by the above. Composed of acrylic or polycarbonate,
The inner lens of a vehicle lamp according to any one of claims 1 to 9, wherein the inner lens is characterized by the above. A reflective surface that reflects light emitted from the inner lens to the outside and puts it inside the inner lens is arranged on at least the back surface side of the inner lens.
The inner lens of a vehicle lamp according to any one of claims 1 to 10. The lamp housing and outer lens that form the lamp chamber,
The light source arranged in the lighting chamber, the inner lens of the vehicle lighting fixture according to any one of claims 1 to 11, and the inner lens.
To prepare
A lighting fixture for vehicles that is characterized by that.

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