JP5225744B2 - LIGHTING DEVICE FOR AUTOMOBILE, LIGHT GUIDE AND MANUFACTURING METHOD THEREOF - Google Patents

Description

  The present invention relates to an automobile lighting device including a long light guide and a light source, a light guide, and a method for manufacturing the same.

  Patent Document 1 discloses a vehicle interior lighting device including an illuminator that extends linearly along the front-rear direction and illuminates a ceiling surface on left and right sides of a ceiling portion in a vehicle interior. The illuminator of the illumination device includes a light guide that extends linearly and a light emitting diode that introduces light into the light guide from an end of the light guide. This document describes that fine reflecting means may be formed without leaving a space with respect to the rear surface of the light guide.

In Patent Document 2, a light source is connected to an end face in the length direction of a rod-shaped light guide, and a V-shape having a surface that reflects and scatters incident light in another side face on one side of the light guide. A linear illumination device is disclosed in which a plurality of grooves are arranged in a row at intervals in the light guide length direction. Each V-shaped groove is linearly formed in the width direction perpendicular to the length direction in order to reflect the light traveling in the length direction of the light guide body in the side surface direction.
JP 2005-306233 A JP 2008-32759 A

  In the illumination device described in Patent Document 1, since the fine reflecting means is formed on the rear surface of the light guide without being spaced apart, only one of the both ends of the linear light guide is provided with a light emitting diode. In this case, a large amount of light is reflected from the rear surface of the light guide at the portion close to the light emitting diode and exits from the front surface. Therefore, the illumination device becomes darker as it is farther from the light emitting diode, and the brightness of the ceiling surface illuminated by the illumination device may become uneven.

  In the linear illumination device described in Patent Document 2, each V-shaped groove is linearly formed in the width direction of the rod-shaped light guide, and is arranged in a row in the length direction of the light guide. As a result, unevenness may occur in the illuminated irradiation site.

  In view of the above, an object of the present invention is to provide an automotive lighting device, a light guide, and a method for manufacturing the same, which can improve the appearance of an illuminated part to be illuminated.

In order to achieve the above object, an automotive lighting device of the present invention includes a long light guide obtained from a resin molding material , and a light source that causes light to enter the longitudinal end face of the light guide, A plurality of recesses formed in one or more shapes selected from a cone shape and a frustum shape on the side surface of the light guide body so as to taper toward the inside of the light guide body in the longitudinal direction. The light guide is disposed at a portion where the plurality of recesses are provided, and the light source side is opposite to the light source from the intermediate position in the longitudinal direction and the light source side from the intermediate position. The plurality of recesses are provided with the second portion as a second portion so that the average luminance of the second portion is larger than the average luminance of the first portion when the light source emits light. .
Further, the present invention is a long light guide used for an automobile lighting device, obtained from a resin molding material, and entering light from a light source from an end face in the longitudinal direction, and on the side surface of the light guide, A plurality of recesses having one or more shapes selected from a cone shape and a frustum shape are provided at intervals along the longitudinal direction so as to taper toward the inside of the light guide. In the portion where the plurality of recesses are provided, the light source side from the intermediate position in the longitudinal direction is the first part, and the side opposite to the light source from the intermediate position is the second part. The plurality of recesses are provided so that the average luminance of the second part is larger than the average luminance of the first part .

  That is, light incident on the end face in the longitudinal direction of the light guide from the light source is reflected by the conical surfaces of the plurality of recesses. Since each concave portion is tapered toward the inside of the light guide, the reflected light is emitted from the light guide. Moreover, since each recessed part is provided at intervals along the longitudinal direction of the light guide, light emitted from the light guide at a portion closer to the light source compared to the case where each recessed part is provided without being spaced. , And more light is emitted from the light guide at a portion far from the light source. Furthermore, since each recess has one or more shapes selected from a cone shape and a frustum shape, it is difficult for unevenness to occur in the irradiated region. Therefore, the appearance of the irradiated part is improved.

Furthermore, the present invention is an elongate light guide used for an automobile lighting device, in which light from a light source is incident from an end surface in a longitudinal direction, and a plurality of recesses are spaced along the longitudinal direction on the side surface. A method of manufacturing a long light guide provided, wherein the light source side from the intermediate position in the longitudinal direction is a first part in the portion of the light guide provided with the plurality of recesses, the intermediate position From the side opposite to the light source as a second part, a mold having a cavity for molding the long light guide is formed into a cone shape and a frustum shape so as to be tapered toward the inside of the cavity. And a plurality of the concave portions so that the average luminance of the second portion is larger than the average luminance of the first portion when the light source emits light. the cavitation a plurality of removable pin having a projection portion formed Along the longitudinal direction formed removably attached to the mold body at intervals, by filling a resin molding material for molding the light guide to the mold cavity, by the plurality of detachable pins characterized by forming a light guide having a plurality of recesses on the sides.

That is, the cavity for forming the long light guide has one or more shapes selected from a cone shape and a frustum shape so as to be tapered toward the inside at a portion that becomes a side surface of the light guide. And a plurality of recesses formed at intervals along the longitudinal direction. Accordingly, a plurality of recesses having one or more shapes selected from a cone shape and a frustum shape are formed on the side surface of the light guide body so as to taper toward the inside of the light guide body. At intervals. Therefore, the illuminating device provided with the light source that makes the light incident on the longitudinal end face of the manufactured light guide can improve the appearance of the irradiated part.
In addition, since a plurality of detachable pins are detachably attached to the mold body, the amount of light emitted from the light guide can be reduced without adjusting the mold body by attaching a detachable pin whose shape has been adjusted to the mold body. Can be partially adjusted.

Here, the cone shape referred to in the present invention includes an elliptical cone shape and a pyramid shape. The elliptical cone shape includes a cone shape. The frustum shape referred to in the present invention includes an elliptic frustum shape and a truncated pyramid shape. The elliptic frustum shape includes a truncated cone shape.
Filling the cavity with the resin molding material includes injecting the resin molding material into the cavity.

According to the invention which concerns on Claim 1, Claim 3 , Claim 4 , the illuminating device for motor vehicles which can improve the appearance of the irradiation site | part to illuminate, a light guide, and its manufacturing method can be provided.
In the invention which concerns on Claim 2, compared with the case where a recessed part is not roughened, the intensity | strength of the light emitted from a light guide can be made more uniform.
In the invention which concerns on Claim 5 , the intensity | strength of the light which comes out of a light guide can be made more homogeneous compared with the case where the convex part of an attachment / detachment pin is not roughened.

(1) Configuration of lighting device for automobile:
FIG. 1 is a side view of an essential part showing the interior of an automobile 1 employing an automobile lighting device 10 according to an embodiment of the present invention, FIG. 2 is a bottom view of a roof flyer 2 provided with the lighting device 10, and FIGS. FIG. 5 is a perspective view showing the external appearance of the illumination device 10, FIG. 6 is a rear view of the light guide 40, and FIG. 7 is a diagram showing the illumination device 10 in FIG. FIG. 8 is a perspective view showing a main part of the light guide 40, and FIG. 9A shows the light guide seen from the position A2-A2 in FIG. FIG. 9B is a cross-sectional view of the light guide viewed from the position A2-A2 in FIG. FIG. 9 shows a cross section of the light guide 40 with the recess 50 on the lower side.

An automobile 1 shown in FIG. 1 is a one-box type passenger automobile 1 designed and equipped for use on a road. Of course, the present invention is also applicable to sedan type passenger cars and the like.
The automobile 1 is provided with a front window and an instrument panel in front of the front seat 1a, and in front of the front door 1b, between the front and rear doors 1b and 1c, after the rear door 1c, and after the inset window thereafter. Pillars are provided to support the roof panel. Further, a door trim as an interior material is attached to the door 1b, 1c on the passenger compartment SP1 side, and a pillar trim (pillar garnish) is attached to the pillar as an interior member on the passenger compartment SP1 side. A roof liner (headliner) 2 is attached as an interior material to the vehicle compartment SP1 side of the panel, and a luggage side trim is attached as an interior material to the side panel of the cargo compartment SP2.

As shown in FIGS. 1 and 2, the automotive lighting device 10 is incorporated in the roof flyer 2 and is indirect lighting that illuminates the lower surface of the roof flyer 2, that is, the ceiling surface of the passenger compartment SP <b> 1. Of course, the automotive lighting device 10 may be provided on an interior material such as a door trim, a pillar trim, a luggage side trim, or directly on a vehicle body panel such as a door panel. Moreover, the automotive lighting device 10 may be a direct illumination that directly enters the eyes. The illuminating device 10 is provided in a long region and illuminates a long range in the automobile interior. Moreover, since the elongate light guide 40 is thin, it can be installed in a limited space of an automobile.
In the roof liner 2 of the present embodiment, lighting devices 10A and 10B with which the end surfaces 44 abut each other and lighting devices 10C and 10D with which the end surfaces 44 abut each other are installed symmetrically in the vicinity of the edge in the vehicle width direction. Yes. The light source units 30A and 30B of the illumination devices 10A and 10B are separated from each other, and the light source units 30C and 30D of the illumination devices 10C and 10D are disposed apart from each other. Of course, the front and rear lighting devices 10A and 10B may be integrated, the front and rear lighting devices 10C and 10D may be integrated, or three or more lighting devices may be arranged in series in the front and rear.

  The roof liner 2 covers the roof panel made of steel plate to decorate the passenger compartment and improve the safety of the passenger. Further, the roof flyer 2 also functions as a soundproofing material, for example, suppressing noise such as wind noise and rain sound during traveling from reaching the vehicle interior and absorbing noise that has entered the vehicle interior. The roof flyer 2 is usually incorporated with various accessories such as an assist grip and a sun visor.

  The roof liner 2 usually has a base material having shape retention and moldability, and a skin material that covers the passenger compartment side of the base material. The base material is formed into a shape suitable for being disposed along the roof panel of the automobile 1. For the base material, fibers can be gathered and molded by press molding or the like, or a resin molding material such as thermoplastic resin can be foamed and molded by injection molding or the like. Substrates formed from fibers containing binder fibers such as, substrates formed by adding glass fibers or carbon fibers to stabilize the dimensions, substrates using natural fibers, substrates made of resin foam, urethane A base material using a resin, a cardboard base material, or the like can be used. The skin material is a surface layer provided on the surface of the roof liner 2 on the side of the passenger compartment in order to decorate the passenger compartment SP1 and improve the touch feeling, and a nonwoven fabric, a woven fabric or a knit can be used. A skin material is laminated | stacked on this base material simultaneously with shaping | molding of a base material, or is affixed on this base material before shaping | molding of a base material, or after shaping | molding.

  Grooves 2a and 2a that are recessed obliquely upward are formed in the vicinity of both edges in the vehicle width direction of the roof liner 2 as shown in FIGS. These grooves 2 a and 2 a form a long space extending in parallel in the front-rear direction and accommodate the lighting device 10. The grooves 2a and 2a are formed integrally with the roof liner 2 so that it is not necessary to add another part. Since the roof liner 2 has rigidity for maintaining the shape, the depth of the groove 2a is limited, and only a limited narrow space can be secured. Further, the roof liner 2 is generally formed in a curved shape so as to bulge upward from the front to the rear in accordance with the shape of the roof panel. Therefore, the groove 2a is also formed in the roof liner 2 so as to be curved. The illuminating device 10 is accommodated in the long space of the groove 2a, and irradiates light inward in the vehicle width direction from above the molding 3 disposed below the groove 2a.

The basic part of the illumination device 10 is composed of a long light guide 40 and a light source 32. In the illumination device 10 of the present embodiment, the light source 32 is provided in the light source unit 30, the light guide 40 is accommodated in the long housing 20, and the molding 3 is attached to the housing 20. The mall 3 is arranged on the vehicle interior side of the lighting device 10 and improves the design of the vehicle interior SP1 so that the passenger in the vehicle interior SP1 cannot see the lighting device 10 directly.
Here, the long light guide includes a rod-shaped light guide, an elongated plate-shaped light guide, a cylindrical light guide, a linear light guide, a curved light guide, and the like. Includes shapes having recesses and protrusions.

The light guide 40 of the present embodiment has a long rod shape and is installed on the roof liner 2 with the longitudinal direction D1 facing the front and rear of the automobile 1.
As shown in FIG. 7, the end surface (light source side end surface 43) in the longitudinal direction D <b> 1 of the light guide 40 is a light receiving surface for light emitted from the light source 32. The side surface 45 of the light guide body 40 is provided with a plurality of concave portions 50 that are tapered toward the inside of the light guide body 40 at intervals along the longitudinal direction D1. The light guide 40 is formed from the light source side end face 43 with the side face 45 having these recesses 50 as the back face (first side face) and the side face 46 opposite to the back face 45 as the light emitting face (second side face). While the incident light is guided toward the end face 44 along the longitudinal direction D1, it is reflected little by little by the concave portions 50 of the back face 45 and emitted from the light emitting face 46 to the outside. Here, a direction from the back surface 45 toward the light emitting surface 46 is defined as a light emitting direction D2, and a direction orthogonal to the light emitting direction D2 and the longitudinal direction D1 is defined as D3 (vertical direction). In FIG. 7, the center of the traveling direction of the incident light from the light source side end face 43 is indicated by D4, and an example of the traveling direction of the outgoing light exiting from the light emitting surface 46 is indicated by D5. Of course, the center D4 in the traveling direction of the incident light is a direction along the longitudinal direction D1, and the traveling direction D5 of the reflected light is a direction along the light emitting direction D2. Each recess 50 has one or more shapes selected from a cone shape and a frustum shape so as to taper toward the inside of the light guide 40. From the viewpoint of the strength of the light guide, the shape of the recess is preferably an elliptical cone shape (including a conical shape) or an elliptical truncated cone shape (including a truncated cone shape). The recessed part 50 shown in FIGS. 5-9 is made into the cone shape recessed from the back surface 45 to the light emission direction D2.

  The light source 32 is disposed in the vicinity of the light source side end surface 43 of the light guide, and makes light incident on the light source side end surface 43. Here, since each concave portion 50 of the light guide is tapered toward the inside of the light guide 40, the light reflected by the conical surface 51 is emitted from the light guide 40. Moreover, since each recessed part 50 is provided at intervals along the longitudinal direction D <b> 1 of the light guide body 40, light emitted from the light guide body 40 is reduced in a portion near the light source 32 and in a portion far from the light source 32. The amount of light emitted from the light guide 40 increases. Furthermore, since each recessed part 50 is made into the cone shape, it is hard to produce a stripe nonuniformity in an irradiation site | part.

  The housing 20 is formed in an H-shaped section as shown in FIG. 3 and the like, and has a long outer shape along the groove 2a of the roof liner. The housing 20 includes an upper wall portion 21 and a lower wall portion 22 that are arranged substantially horizontally, and a partition portion 23 that vertically connects the upper wall portion 21 and the lower wall portion 22 in the middle. A first groove 24 is formed on the side, and a second groove 25 is formed on the vehicle exterior side from the partition portion 23. The upper wall portion 21 of the housing is formed with a plurality of openings 21a through which a housing mounting clip 29 is passed with a gap in the longitudinal direction (D1). On the lower wall portion 22 of the housing, a plurality of engagement protrusions 22a for attaching the molding 3 are formed at intervals in the longitudinal direction (D1). The cross-sectional shape of the housing 20 is substantially the same throughout the longitudinal direction. The light guide 40 is accommodated in the first groove 24, and the power supply wire harness 5 is accommodated in the second groove 25. The light guide 40 exposes the light emitting surface 46, and a back surface 45, an upper surface (third side surface) 47, and a lower surface (fourth side surface) 48 are surrounded by the walls 21, 22 and the partition portion 23. 20 is held.

  As shown in FIG. 3, the housing 20 is fixed to the roof liner 2 by a plurality of clips 29 arranged at intervals in the longitudinal direction (D1). As each clip 29, a known resin clip or the like having an engaging portion having elasticity at the tip 29a can be used. On the other hand, the roof liner 2 is formed with openings 2b into which the respective clips 29 are fitted. A reinforcing sheet metal 4 having an opening is disposed outside the roof liner 2 in the vicinity of the opening 2b. When the leading end 29 a of the clip is passed through the opening 21 a in the upper wall portion of the housing, the opening 2 b in the roof liner and the opening in the sheet metal 4, the housing 20 is attached to the roof liner 2 by the clip 29.

  For the housing 20, a molded product obtained by molding a resin molding material such as a thermoplastic resin by injection molding, extrusion molding, press molding, or the like, a molded product obtained by molding a metal such as aluminum or stainless steel by press molding, or the like is used. it can. As the resin constituting the resin molding material, polycarbonate or the like can be suitably used from the viewpoint of light reflectivity and dimensional stability, such as acrylonitrile butadiene styrene copolymer (ABS), polymer alloy of ABS and polycarbonate, etc. Can also be used. In the case where the housing 20 is a resin molded product, white, a light color close to white, or the like is preferably used as the color of the housing 20 from the viewpoint of reflecting light well. Moreover, you may provide the light reflection materials 26a and 26b in the 1st groove | channel 24 like the illuminating device 11 shown in FIG. In the example of the figure, the light reflecting materials 26a, 26b, and 26b are attached to the partition portion 23 and the wall portions 21 and 22, respectively, but only a part of these light reflecting materials 26a, 26b, and 26b is the first groove. 24 may be provided. As the light reflecting material, a film obtained by depositing a metal thin film on a resin film such as a thermoplastic resin can be used. When the light reflecting material is provided in the housing, the light reflectance of the housing is increased, so that the amount of light exiting from the light guide to the passenger compartment is increased, and the irradiated part is brightened.

  As shown in FIG. 4, the molding 3 attached to the housing 20 is formed with openings 3 c that are engaged with the engaging protrusions 22 a protruding downward from the lower wall portion 22 of the housing with a space in the longitudinal direction (D 1). ing. For the molding 3, a molded product obtained by molding a resin molding material such as a thermoplastic resin (including a thermoplastic elastomer) by extrusion molding, injection molding, press molding, or the like can be used. Moreover, you may use the resin molded product which laminated | stacked skin materials, such as a nonwoven fabric, a woven fabric, and a knitted fabric, for a mall. In the illustrated molding 3, a soft and cushioning resin molding material layer 3a is disposed on the front surface side (vehicle compartment side), and a hard molding shape retaining resin layer 3b is disposed on the back surface side. It is formed into two layers by two-color (two-layer) extrusion molding.

  The light source unit 30 includes a light source 32, a printed circuit board on which a circuit for driving the light source to be lit is formed, and the like. The light source unit 30 is electrically connected to a control circuit (not shown). For example, when an operation for turning on a switch provided on the instrument panel is received, the light source 32 is turned on and the switch is turned off. Is received, the light source 32 is turned off. Of course, the light source 32 may be turned on when the doors 1b and 1c are opened, and turned off when the doors 1b and 1c are closed.

As the light source 32, an LED (light emitting diode) that is light and compact, has directivity in the irradiation direction, and has a long lifetime can be suitably used. The light source 32 shown in FIG. 7 is not a bullet-type LED but a surface-mounted LED in which an LED chip is bonded on a substrate. The surface-mounted LED is preferable because it can be arranged in a narrow space as compared with the bullet-type LED.
Of course, an incandescent bulb, a halogen bulb, a fluorescent lamp, a discharge lamp, or the like can be used as the light source 32. In addition, various colors such as white, red, green, and blue can be adopted as the emission color of the light source, and the same illumination device 10 may be used in combination with light sources of different emission colors.

  The LED 32 is mounted on the substrate together with the connector of the wire harness 5 and the like. This substrate is attached to the case 31 of the light source unit 30. Locking recesses 34 and 34 into which the locking protrusions 40 a and 40 a of the light guide 40 are inserted are formed inside the case 31. By inserting the engaging convex portions 40a, 40a of the light guide into the engaging concave portions 34, 34 of the light source unit and engaging them, the light source unit 30 and the light guide 40 are coupled, and the light emitting surface of the LED 32 Is arranged to face the light source side end face 43 of the light guide. The distance C1 (see FIG. 7) between the light emitting surface of the LED 32 and the light source side end surface 43 may be a distance at which the light from the light source 32 is sufficiently incident on the light source side end surface 43. From the viewpoint of introduction into the light guide 40, 0.5 mm or less is preferable. When the distance C1 is 0.5 mm or less, the utilization efficiency of light emitted from the LED 32 can be sufficiently increased.

The light guide 40 of this embodiment is formed in a substantially quadrangular prism shape. As shown in FIG. 9, the length (thickness) T1 in the light emitting direction D2 and the length (width) W1 in the vertical direction D3 of the light guide 40 are substantially the same. On the other hand, as shown in FIGS. 6 and 7, the length L1 in the longitudinal direction D1 of the light guide 40 is 90 to 200 times longer than the lengths T1 and W1. That is, the ratio W1: L1 between the short side W1 and the long side L1 on the side surfaces 45 and 46 of the light guide 40 is 1:90 to 1: 200, and the short side T1 on the side surfaces 47 and 48 of the light guide 40 is The ratio T1: L1 with the long side L1 is set to 1:90 to 1: 200. Thus, the light guide 40 is a very long and thin rod-shaped member. Of course, a light guide having a ratio of the lengths T1, W1 and the length L1 outside these ranges can also be used in the automotive lighting device of the present invention.
The light guide 40 is a bar-like member having side surfaces 45, 46, 47, and 48 that are substantially flat. Of course, the light guide may have a shape in which part or all of the side surfaces are curved. Further, the light guide body may have a linearly extending shape or a bent shape as a whole.

  The total length L1 of the light guide 40 is designed to be slightly longer than the total length of the housing 20, and the light source side end face 43 protrudes from the housing 20 and is accommodated in the first groove 24 of the housing. The light source unit 30 of the present embodiment is attached to the light guide 40 so as to cover the light source side end face 43 coming out of the housing 20.

For the light guide 40, a transparent or substantially transparent molded product obtained by molding a transparent or substantially transparent resin molding material by injection molding, press molding, extrusion molding or the like can be used. As the resin constituting the resin molding material, a transparent material having transparency, such as a translucent acrylic resin, polycarbonate, or silicone resin, can be used. In the present embodiment, fine particles having light scattering properties are not added to the resin molding material. Thereby, when light is incident on the end face of the long light guide, it is possible to suppress as much as possible the attenuation of light that is noticeable in the light guide in which the light scattering fine particles are dispersed. It becomes easy to emit light substantially uniformly over the entire length of the light guide.
Of course, the light-scattering fine particles have transparency as long as most of the light incident from the end face of the long light guide is not scattered, that is, as long as the incident light is essentially reflected from the recess and emitted from the light emitting surface. It may be included in the light guide.

Each recess 50 provided in the light guide 40 has a circular opening 52 on the back surface 45 and is recessed in the light emitting direction D <b> 2 so as to taper to the middle of the light guide 40. When the plurality of concave portions 50 are viewed from the light emitting direction D2, it appears that the light emitting surface 46 is arranged in a dot shape.
The distance between the centers of the recesses 50 arranged on the back surface 45 (interval between adjacent recesses 50) L2 (see FIG. 5) is, for example, 5 to 19 mm, 1 to 3.8 times the width W1 of the light guide, The thickness is set to 1 to 3.8 times the thickness T1. When the distance L2 is greater than or equal to the lower limit, the light guide can be easily formed, and the processing cost of the light guide can be reduced. If the distance L2 is less than or equal to the above upper limit, unevenness in the brightness of the irradiated region is unlikely to occur.

  The depths H1 and H2 (see FIG. 9) of the recess 50 are preferably 0.02 to 0.6 times (2 to 60%) the thickness T1 of the light guide, and 0.05 to 0.5 times the thickness T1. Is more preferable. Further, the diameters DI1 and DI2 (see FIG. 5) of the opening portion 52 of the recess 50 are preferably 0.8 times (80%) or less of the width W1 of the light guide, and more preferably 0.7 times or less of the width W1. . By setting the depths H1 and H2 of the recesses and the diameters DI1 and DI2 within the above ranges, sink marks may occur when the light guide 40 is molded, or molding defects may occur due to an obstruction of the flow of the resin molding material. In addition, the light guide 40 can be made to have sufficient strength so as not to be cracked or deformed.

  The angle θ1 (see FIG. 9) formed between the back surface 45 of the light guide and the conical surface 51 of the recess 50 is preferably 30 to 50 °, more preferably 35 to 45 °, and particularly preferably 45 °. The apex angle θ2 of the conical recess 50 is 80 to 120 ° when θ1 = 30 to 50 °, and 90 to 110 ° when θ1 = 35 to 45 °. It is preferable to set the angle θ1 to be equal to or greater than the lower limit because the emission efficiency of light emitted from the light emitting surface 46 is sufficiently increased. It is preferable that the angle θ1 be less than or equal to the above upper limit because the light guide can be easily removed from the mold when a light guide having a recess is injection molded. In particular, when the angle θ1 is about 45 °, the reflection angle when the light traveling in the light guide 40 along the longitudinal direction D1 is reflected by the conical surface 51 of the concave portion is about 90 °. On the other hand, the amount of light emitted almost orthogonally increases. Thereby, the light which has directivity can be emitted from a light guide, and the irradiation distance of an illuminating device can be lengthened.

The conical surface 51 of the recess according to the present embodiment is roughened. In addition, the part except the recessed part 50 among the back surfaces 45 of a light guide is not roughened, and the end surfaces 43 and 44 and the side surfaces 46, 47, and 48 in the light guide 40 are also not roughened. When the concave portion 50 is roughened, the light reflected from the conical surface 51 is scattered and blurred, and the intensity of the light emitted from the light guide 40 is made more uniform than when the conical surface is not roughened. Can do. As a result, uneven illuminance is less likely to occur in the irradiated region, and illumination with high design is realized.
In the present embodiment, the concave portion 50 is roughened simultaneously with the molding of the light guide 40 by roughening the portion corresponding to the concave portion 50 of the mold for molding the light guide 40. Of course, the roughening of the concave part of the light guide is roughening by post-processing such as blasting by spraying blasting material such as sand, granular glass, granular alumina, granular metal, granular plastic, etc. But you can.

  The arithmetic average roughness Ra of the recess 50 is preferably Ra = 2 to 20 μm, and more preferably Ra = 3 to 10 μm. Here, Ra is the arithmetic mean roughness specified in JIS B0601-1994 (Product Geometric Characteristics Specification (GPS) -Surface Properties: Contour Curve Method-Terminology, Definitions and Surface Property Parameters 1994 Revised Version) . Ra is preferably equal to or more than the lower limit, since it is easy to process to a desired roughness. Ra is preferably not more than the above upper limit because the resin molding material hardly remains on the rough surface of the recess, the shape transfer property is improved, and the mold release property is also improved.

Further, as shown in FIGS. 7 and 9, assuming that the depth of the recess 50a relatively close to the light source 32 is H1, and the depth of the recess 50b relatively far from the light source 32 is H2, the relationship of H2 ≧ H1 is established. Each recess 50 is formed in the light guide 40. The light incident on the light source side end face 43 is reflected by the concave portion 50 and emitted to the outside as the distance from the light source 32 increases. By setting the depth of each recess 50 to H2 ≧ H1, the difference between the amount of light reflected by each recess 50 close to the light source 32 and the amount of light reflected by each recess 50 far from the light source 32 is reduced. The light guide 40 as a whole can emit light more uniformly.
Of course, even if the interval between the recesses adjacent to each other relatively close to the light source is wider than the interval between the recesses adjacent to each other relatively far from the light source, The difference from the amount of light emitted from the light emitting surface at a portion far from the light source can be reduced.

As shown in FIG. 6, the light guide 40 of the present embodiment has a light source 32 side from an intermediate position 40 m in the longitudinal direction D <b> 1 in a portion provided with a plurality of concave portions 50 (portions represented by reference numerals 41 and 42). The first part 41, the second part 42 from the intermediate position 40m opposite to the light source 32 is used, and the average luminance B2a of the second part 42 is higher than the average luminance B1a of the first part 41 when the light source 32 emits light. A plurality of recesses 50 are provided to increase the size. Here, the serial numbers of the concave portions 50 of the light guide are set to i = 1, 2,..., N (n is an integer of 2 or more) in order from the light source 32 side, and the serial numbers of the concave portions 50 included in the first portion 41 are set. , M (m is a positive integer less than n), and the serial numbers of the recesses 50 included in the second part 42 are m + 1, m + 2,. _i (cd / m ² ). The luminance of each concave portion i can be obtained by measuring the luminance at a position away from the concave portion i in the light emitting direction D2 by a predetermined distance (for example, 350 mm). The average luminance B1a of the first portion (cd / m ²⁾ _{is, B 1, B 2, ...} , represented by the sum of B _m. Second part of the average luminance B2a (cd / m ²⁾ _{is, B m + 1, B m} + 2, ..., represented by the sum of B _n. In the example of FIG. 6, since the center of the concave portion 50 of the n = 40 to the light-emitting surface 46 are provided at equal intervals, an m = 20, average luminance B1a becomes the sum of B ₁ .about.B _20, average luminance B2a is the sum of B ₂₁ .about.B _40.

If the chromaticity (especially hue) does not change before the light incident from the light source side end face 43 reaches the opposite end face 44, the average luminance of the first part 41 and the second part 42 should be the same. For example, it is felt to a person that the light guide 40 emits light uniformly throughout. However, the light guide 40 obtained from the resin molding material having transparency changes the chromaticity (especially hue) as the light travels from the light source side end face 43 to the opposite end face 44, and even if the average luminance is the same, The second part 42 is felt darker than the first part 41. For example, when the light guide 40 is an acrylic resin molded product, the ratio of the blue component decreases as the light travels from the light source side end face 43 to the opposite end face 44, and the second part 42 becomes the first part. It looks yellower than 41 and looks darker. When the light guide 40 is a polycarbonate molded product, the second portion 42 appears more noticeably yellow and darker.
When the average brightness B2a of the second part is higher than the average brightness B1a of the first part, the brightness of both parts 41 and 42 can be felt to the same person. Therefore, in order to obtain visually uniform brightness, a plurality of recesses 50 are provided in the light guide 40 so that B2a> B1a.

  The average luminance B2a of the second part is preferably 1.1 to 2 times, more preferably 1.2 to 1.8 times the average luminance B1a of the first part.

  The above-described automobile lighting device 10 may be arranged in the automobile 1 with the end faces 44 abutting each other as shown in FIG. 2 or the like, or may be arranged in the automobile 1 so as not to contact each other. When the end surfaces 44 of the plurality of lighting devices 10 are brought into contact with each other, light enters the end surface 44 of the other light guide from the end surface 44 of one light guide, and thus the amount of light emitted from both light guides Can be made more uniform throughout. Of course, even if the lighting device 10 is used alone, the long light guide 40 is provided with a plurality of conical or frustum-shaped concave portions at intervals along the longitudinal direction D1. The amount of light emitted from the body 40 can be made sufficiently uniform in practice.

(2) Manufacturing method of automobile lighting device:
Next, the manufacturing method of the illuminating device 10 for motor vehicles which has the light guide 40 which concerns on this embodiment is demonstrated.
10 is a vertical sectional view of the light guide manufacturing apparatus 100, FIG. 11 is an exploded view showing the light guide manufacturing apparatus 100, and FIG. 12A is a plan view showing the main part of the lower mold 122 as viewed from above. 12 (b) is a bottom view showing the main part of the lower mold 122 as viewed from below, and FIG. 13 is a perspective view showing the appearance of the detachable pins 130A and 130B.

The light guide manufacturing apparatus 100 is an injection molding machine that manufactures a long light guide 40 used in the automobile lighting device 10 by injection molding. The apparatus 100 includes a molding die 110 having a cavity CA1 for molding a long light guide 40, and an injection machine for injecting (filling) a resin molding material for molding the light guide 40 into the cavity CA1 of the molding die 110. 140.
The mold 110 includes a mold body 120 and a plurality of detachable pins 130 that are detachably attached to the mold body 120, and is usually a mold. Of course, the mold 110 may be formed of a material other than metal.

  The mold body 120 of the present embodiment has a pair of molds 121 and 122 that can be moved toward and away from each other in the vertical direction. The upper mold 121 is provided with a plurality of gates 121b for injecting a resin molding material from the injection machine 140 into the cavity CA1, and is connected to the injection machine 140. The lower mold 122 is formed with holes 123 for fitting the attachment / detachment pins 130 at intervals along the longitudinal direction D11 of the cavity CA1, and a pin fixing member 124 for fixing the attachment / detachment pins 130 inserted into the holes 123. Is provided. Both molds 121 and 122 may be reciprocally movable in the vertical direction, or only one of them may be reciprocally movable in the vertical direction. The gate may be provided in the lower mold, and the lower mold may be connected to the injection machine.

  The detachable pin 130 has a convex portion 135 having one or more shapes selected from a cone shape and a frustum shape so as to taper toward the inside of the cavity CA1. The detachable pin 130 of the present embodiment has a base portion 132 that becomes a lower portion when mounted on the lower mold 122 and a rod-shaped portion 134 that protrudes upward from the base portion 132, and a convex portion at the tip of the rod-shaped portion 134. A metal pin 135 is formed. When each detachable pin 130 is inserted into the hole 123 and fixed, only the convex portion 135 of each detachable pin protrudes into the cavity CA1. Accordingly, the mold surfaces 121a and 122a of the molds 121 and 122 and the convex portions 135 form the cavity CA1 to form the outer shape of the light guide 40. The convex portion 135 shown in FIGS. 10, 11, and 13 has a conical shape protruding from the lower mold surface 122a toward the upper mold surface 121a.

The conical surface of the convex portion 135 of this embodiment is roughened. In addition, the part except the convex part 135 among the attachment / detachment pins 130 is not roughened, and the mold surfaces 121a and 122a are not roughened. The roughening of the convex portion 135 can be performed by, for example, a roughing process that applies a file to the conical surface of the convex portion 135. Of course, the roughening of the convex part of the detachable pin may be roughened by blasting, spraying, etching, or the like in which a blast material is sprayed on the convex part. By roughening the convex portion 135, the fine irregular shape of the convex portion 135 is transferred to a transparent or substantially transparent resin molding material. This eliminates the need for a relatively difficult surface treatment for roughening the conical surface 51 of the minute recess after the light guide 40 is formed. Moreover, when the convex part 135 is roughened, the light reflected from the concave part 50 of the molded light guide 40 is scattered and scattered, and the light guide 40 is compared with the case where the convex part 135 is not roughened. The intensity of the emitted light can be made more uniform.
The arithmetic average roughness Ra of the convex portion 135 is preferably Ra = 2 to 20 μm, and more preferably Ra = 3 to 10 μm.

Further, as shown in FIG. 13, the convex portion 135A of the detachable pin 130A for forming the concave portion 50a relatively close to the light source 32 is the convex portion of the detachable pin 130B for forming the concave portion 50b relatively far from the light source 32. It is smaller than 135B. The height H11 and diameter DI11 of the convex portion 135A are adjusted to the depth and diameter of the concave portion 50a, and the height H12 and diameter DI12 of the convex portion 135B are adjusted to the depth and diameter of the concave portion 50b. By setting the height of each convex portion 135 to H12 ≧ H11, the difference between the amount of light reflected by the concave portion 50 near the light source 32 and the amount of light reflected by the concave portion 50 far from the light source 32 is reduced, The light guide 40 as a whole can emit light more uniformly.
Of course, even if the spacing between adjacent convex portions is adjusted, the difference between the amount of light emitted from the light emitting surface near the light source and the amount of light emitted from the light emitting surface far from the light source can be reduced. it can.

  As shown in FIG. 11, when the detachable pins 130 are fitted in the holes 123 of the lower mold and the detachable pins 130 are fixed to the lower mold 122 by the pin fixing members 124, the plurality of detachable pins 130 are elongated with respect to the mold body 120. It is detachably attached at intervals along the direction D11. Then, when the molds 121 and 122 are brought close to each other and clamped, a cavity CA1 shown in FIG. 10 is formed. When the injection machine 140 injects a liquid (including molten) resin molding material from the gate 121b into the cavity CA1, the cavity CA1 is filled with the liquid resin molding material. After that, when the molding die 110 is cooled or the like, and the resin molding material in the cavity CA1 is solidified or cured, the light guide 40 is injection molded. At this time, the shape of the convex portion 135 of each detachable pin is transferred to the back surface 45 of the light guide, and the light guide 40 having a plurality of concave portions 50 formed by the plurality of detachable pins 130 on the back surface 45 is formed. And if the type | molds 121 and 122 are opened and the light guide 40 is taken out, it can be used for manufacture of the illuminating device 10 for motor vehicles.

  According to the light guide manufacturing method described above, if a plurality of holes 123 are formed at intervals in the mold main body 120, the concave portion 50 having a desired shape can be obtained simply by changing the shape of the convex portion 135 of each detachable pin. It is possible to manufacture the light guide 40 having the following. Moreover, if the detachable pin without the convex part 135 is used together, the light guide 40 having the concave parts 50 having a desired interval can be manufactured. Therefore, it is possible to easily form a minute recess in the long light guide and to freely design the shape and interval of the recess of the light guide without remaking the mold body.

Then, as shown in FIG. 7, the light source unit 30 and the light guide 40 are coupled by inserting and engaging the locking convex portion 40a of the light guide into the locking concave portion 34 of the light source unit. The automobile lighting device 10 is formed.
Therefore, according to the manufacturing method mentioned above, the manufacturing method of the light guide which can improve the appearance of the irradiation site | part to illuminate, and the manufacturing method of the illuminating device for motor vehicles can be provided.

(3) Functions and effects of the automotive lighting device:
Hereinafter, the operation and effect of the automotive lighting device 10 will be described.
Light incident on the light source side end surface 43 of the light guide from the light source 32 is gradually reflected by the concave portions 50 while proceeding toward the opposite end surface 44. Here, since each recess 50 is tapered toward the inside of the light guide 40, the light reflected by the recess 50 is emitted from the light emitting surface 46. As shown in FIGS. 3 and 4, the light emitted from the light emitting surface 46 is irradiated to the inner side in the vehicle width direction through the gap between the roof liner 2 and the molding 3, illuminates the lower surface of the roof liner 2, which is the irradiation site, and reflect. Thereby, the illuminating device 10 functions as indirect illumination of vehicle interior SP1.

  Moreover, since each recessed part 50 is provided at intervals along the longitudinal direction D1 of a light guide, compared with the case where each recessed part is provided without leaving a space | interval, it is a light guide in the part close | similar to the light source 32. The light emitted from the light guide 40 is reduced, and the light emitted from the light guide 40 is increased in a portion far from the light source 32. Thus, when the light emitting surface 46 of the light guide is directly viewed, a plurality of pseudo point light sources 39 with uniform brightness are provided in the light guide 40 at intervals in the longitudinal direction D1, as shown in FIG. Looks like it has been.

  Here, as described in Japanese Patent Application Laid-Open No. 2008-32759, each V-shaped groove is linearly formed in the width direction of the rod-shaped light guide, and is arranged in a row in the length direction of the light guide. If it arrange | positions, the light reflected by each V-shaped groove | channel will become the linear light which faced the width direction. When an irradiation site is illuminated with such a plurality of linear lights, unevenness in the irradiation site may occur.

In the illuminating device 10 of this embodiment, since each recessed part 50 of a light guide is made into cone shape, the light reflected by each recessed part 50 does not become a linear form. Even if each concave portion of the light guide is not conical, the light reflected by each concave portion 50 does not become linear if the concave shape of the light guide is one or more selected from a cone shape and a frustum shape. This makes it difficult for unevenness to occur in the irradiated region and improves the appearance of the irradiated region. Further, when each concave portion of the light guide has one or more shapes selected from a cone shape and a frustum shape, a direction D4 in the light guide 40 from the light source side end surface 43 toward the opposite end surface 44 is provided. Since light from all directions is reflected and emitted from the light emitting surface 46 as well as the light traveling to, the light utilization efficiency is increased.
As described above, the automotive lighting device 10 can improve the appearance of the irradiated region to be illuminated.

  When the automotive lighting device is used as direct illumination, it appears that a plurality of pseudo point light sources are provided in the light guide at intervals in the longitudinal direction. When the device is used, a design such as illumination can be given to the passenger compartment or the outside of the vehicle.

(4) Modification:
The number of light sources that allow light to enter the end face of the long light guide is not limited to one, but may be plural. The light source may be provided on each of both end faces of the long light guide in addition to being provided only on one end face of the long light guide.
In addition to the arrangement in which the longitudinal direction is substantially horizontal, the arrangement of the long light guides may be an arrangement in which the longitudinal direction is different from horizontal such as vertical. Further, the light emission direction from the light guide body may be a direction different from the horizontal, such as vertical, in addition to being substantially horizontal.
The shape of the concave portion of the light guide may be an elliptical cone shape excluding a conical shape, a cone shape excluding an elliptical cone shape, or a frustum shape.

FIG. 16A is a perspective view showing a main part of the light guide 241 having the truncated conical recess 251, and FIG. 16B is a vertical sectional view of the light guide 241. Since the concave portion 251 is also tapered toward the inside of the light guide 241, the light reflected by each concave portion 251 is emitted from the light emitting surface 46 as a pseudo point light source. The recess 251 may have an elliptic frustum shape excluding the truncated cone shape, or may be a frustum shape excluding the elliptic frustum shape.
FIG. 16C is a perspective view showing a main part of the light guide 242 having a pyramid-shaped recess 252, and FIG. 16D is a rear view showing the main part of the light guide 242. Since the concave portion 252 is also tapered toward the inside of the light guide 242, the light reflected by each concave portion 252 is emitted from the light emitting surface 46 as a pseudo point light source. The recess 252 may have a pyramid shape other than a hexagonal pyramid, or may have a cone shape excluding the pyramid shape. In particular, when the concave portion has a polygonal pyramid shape of N pyramids (N is an integer of 5 or more), a pseudo point light source is favorably formed by the concave portion.
FIG. 16E is a perspective view showing the main part of the light guide 243 having the truncated pyramid-shaped recess 253, and FIG. 16F is a rear view showing the main part of the light guide 243. FIG. Since the concave portion 253 is also tapered toward the inside of the light guide 243, the light reflected by each concave portion 253 is emitted from the light emitting surface 46 as a pseudo point light source. The recess 253 may have a truncated pyramid shape other than the hexagonal truncated pyramid, or may have a truncated cone shape other than the truncated pyramid shape. In particular, when the concave portion has a polygonal truncated pyramid shape with an N-pyramidal frustum (N is an integer of 5 or more), a pseudo point light source is favorably formed by the concave portion.

Further, the long light guide may be a prismatic shape other than a quadrangular prism shape such as a triangular prism shape, an elliptical column shape such as a cylindrical shape, or a column that is not included in the prismatic shape and the elliptical column shape. It may be a body.
FIG. 17A is a vertical cross-sectional view of a rectangular columnar light guide 244. The light guide 244 has a recess 50 formed on the back surface 45, and a side surface 46 opposite to the back surface 45 is a light emitting surface. The cross-sectional shape of the light guide 244 is a trapezoid with the back surface 45 and the light emitting surface 46 as upper and lower bases. That is, the third side surface 47 and the fourth side surface 48 are inclined from the light emitting direction D2 so that the light emitting surface 46 side becomes wider. Thereby, since the light reflected by the side surfaces 47 and 48 is also emitted from the light emitting surface 46, the light incident from the light source side end surface can be efficiently guided to the light emitting surface 46.

  FIG. 17B is a vertical sectional view of the cylindrical light guide 245. The light guide 245 has a recess 50 formed on a cylindrical surface. Light incident on the end face in the longitudinal direction of the light guide 245 from the light source is gradually reflected by each concave portion 50 while traveling toward the opposite end face, and is emitted from the cylindrical surface to the outside. Here, since the cylindrical light guide 245 exhibits the function of a lens, the directivity of outgoing light is improved, and light can reach farther.

Furthermore, the plurality of recesses provided in the light guide need not all have the same shape, for example, two or more shapes selected from an elliptical cone shape, an elliptical truncated cone shape, a truncated pyramid shape, and a truncated pyramid shape. Concave portions may be mixed.
FIG. 18 is a rear view of the light guide 246 having variously shaped recesses. The light guide 246 includes a conical recess 50, a truncated cone-shaped recess 251, a pyramid-shaped recess 252, and a truncated pyramid-shaped recess 253. As a result, the light reflected by each recess forms a pseudo illumination according to the shape of the recess, so that when this illumination device is used in the interior or body of an automobile, the desired illumination effect can be imparted to the passenger compartment or outside the vehicle. Can do.

  In addition, a housing or the like is not provided in the automobile lighting device, and the effect of improving the appearance of the irradiated part to be illuminated can be obtained only with a long light guide and a light source, which are basic parts of the automotive lighting device.

(5) Example:
EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated concretely, this invention is not limited by an Example.

また、光源には、順電流値５２mAにて、照度１２．５〜２０．０lxのＬＥＤ（豊田合成株式会社製）を用いた。このＬＥＤを上記導光体サンプルの端部の一方のみに配置し、照明装置サンプルを組み立てた。 [Example 1]
The light guide sample was roughened so that the vertical cross-section was 5 × 5 mm square, the length L1 in the longitudinal direction was 750 mm, and the center-to-center distance L2 was 8 mm from the position 22 mm away from the light source side end surface on the back surface. An acrylic resin injection-molded product having 90 conical concave portions provided at equal intervals was used. The arithmetic average roughness of the conical surface of each recess was Ra = 5 μm. The serial numbers of the recesses are i = 1, 2,..., 90 in order from the light source side, the apex angles θ2 of the recesses i are all 90 °, the depths are as shown in Table 1, and the diameter of the opening is the depth. The corresponding diameter was used. That is, the height of each convex portion of the metal pin is the depth of each concave portion i, roughening processing to roughen the convex portion with a file, forming a mold using each metal pin after the roughening processing, A melted acrylic resin was injected and filled into the cavity, the mold was cooled, and a light guide sample was injection molded.

As the light source, an LED (manufactured by Toyoda Gosei Co., Ltd.) having a forward current value of 52 mA and an illuminance of 12.5 to 20.0 lx was used. This LED was disposed only on one end of the light guide sample to assemble a lighting device sample.

A color luminance meter BM-7 manufactured by Topcon Co., Ltd. was used as the measurement device for the luminance of the recess. The LED of the lighting device sample was caused to emit light, and the luminance B _i (cd / m ² ) at a position 350 mm away from each concave portion i in the light emitting direction D2 was measured with a color luminance meter.

[Example 2]
A light guide sample having a plurality of concave portions that were not roughened was formed in the same manner as in Example 1 except that each convex portion of the metal pin was not roughened.

[Measurement result]
FIG. 19 is a graph showing the measured luminance value B _i (cd / m ² ) of each recess i at i = 5, 25, 45, 65, 85 of each light guide sample. In the figure, Examples 1-1 to 1-3 show the results of Test Groups 1 to 3 in which the luminance of each recess i was measured three times using the light guide sample of Example 1, and Examples 2-1 to 2-3 has shown the result of the test groups 1-3 which measured the brightness | luminance of each recessed part i 3 times using the light-guide sample of Example 2. FIG. Even in the same embodiment, the brightness measurement value differs for each test section due to measurement variations. As shown in the figure, when a plurality of conical recesses tapered toward the inside of the light guide are provided on the side surface of the light guide at intervals along the longitudinal direction, end faces in the longitudinal direction It can be seen that light having a uniform luminance of 240 to 360 cd / m ² was emitted from the light emitting surface over the entire length of the light guide only by disposing the LED on only one of the light guides.

  In Example 2 in which the conical surface of the concave portion is not roughened, the luminance is lowered at the concave portion (i = 65 to 90) far from the light source. This is presumably because more light was reflected from the recesses (i = 1 to 64) near the light source than from the light emitting surface to the outside. On the other hand, in Example 1 in which the conical surface of the concave portion was roughened, the luminance did not decrease at the concave portion (i = 65 to 90) far from the light source. When the light emitting surface of the light guide sample was actually viewed, Example 1 appeared to emit light more uniformly than Example 2.

上記表２に示すように、平均輝度はＢ2a＞Ｂ1aとなったが、導光体全体にわたって均一に発光しているように見えた。これは、光が導光体サンプル内で光源側端面から反対側の端面へ進むうちに青色成分の割合が少なくなり、第二の部位の平均輝度を第一の部位の平均輝度よりも高くすることによって両部位が視覚的に同じ明るさと感じられるためと推察される。 FIG. 20 is a graph showing the measured luminance value B _i (cd / m ² ) of each recess i of the light guide sample in the test section 4 of Example 1. The average luminance B1a of the first part of the test group 4 (sum of B ₁ .about.B _45), a second average (sum of B ₄₆ .about.B ₉₀₎ luminance B2a sites, the first site of the chromaticity x, y and the chromaticity x, y of the second part are values shown in Table 2 below.

As shown in Table 2 above, the average luminance was B2a> B1a, but it appeared that light was emitted uniformly over the entire light guide. This is because the ratio of the blue component decreases as the light travels from the light source side end surface to the opposite end surface in the light guide sample, and the average luminance of the second region is made higher than the average luminance of the first region. This is presumably because both parts feel visually the same brightness.

Furthermore, the irradiation site illuminated by the illumination device samples of Examples 1 and 2 did not show unevenness of the stripes, seemed uniform brightness, and looked good. Therefore, it was confirmed that the automotive lighting device of this example improves the appearance of the irradiated part to be illuminated.
Note that the present invention is not limited to the above-described embodiments and modifications, but the configurations disclosed in the above-described embodiments and modifications are mutually replaced, the combinations are changed, known techniques, and the above-described configurations. Configurations in which the respective configurations disclosed in the embodiments and modifications are mutually replaced or combinations thereof are also included.

The principal part side view which shows an example of the interior of the motor vehicle which employ | adopted the illuminating device. The bottom view which shows an example of the roof flyer which provided the illuminating device for motor vehicles seeing from the bottom. FIG. 3 is a vertical sectional view showing the main part of the roof liner shown in FIG. FIG. 3 is a vertical sectional view showing the main part of the roof liner shown in FIG. The perspective view which shows the example of the external appearance of the illuminating device for motor vehicles. The rear view which shows an example of a light guide seeing from a back surface side. The horizontal sectional view which shows the illuminating device shown in FIG. 5 seeing from the position of A1-A1 of the figure. The perspective view which shows the principal part of the light guide shown in FIG. Sectional drawing which shows the light guide shown in FIG. 5 seeing from the position of A2-A2 and A3-A3 of the figure. The vertical sectional view showing an example of a light guide manufacturing device. FIG. 11 is an exploded view showing the light guide manufacturing apparatus shown in FIG. 10. The figure which shows the principal part of the lower mold | type shown in FIG. The perspective view which shows the external appearance of the attachment / detachment pin shown in FIG. The front view which shows an example of the mode of the light guide in the state which turned on the light source. The vertical sectional view which shows the principal part of a headliner in a sectional view in a modification. The figure which shows the various modifications of the recessed part of a light guide. The figure which shows the various modifications of a light guide. The figure which shows the modification of a light guide. The figure which shows the measurement result of the brightness | luminance of each recessed part in an Example. The figure which shows the measurement result of the brightness | luminance of each recessed part in an Example.

Explanation of symbols

1 ... Automobile, 2 ... Loulena, 3 ... Mall,
10 ... Lighting device for automobile,
20 ... Housing,
30 ... light source unit, 32 ... light source, 39 ... pseudo light source,
40, 241, 242, 243, 244, 245, 246 ... long light guide,
40a: locking convex part, 40m: intermediate position,
41 ... first part, 42 ... second part,
43 ... light source side end face, 44 ... end face,
45 ... back surface (first side surface), 46 ... light emitting surface (second side surface),
47 ... third side, 48 ... fourth side,
50, 251, 252, 253 ... concave portion, 51 ... conical surface,
100 ... Light guide manufacturing apparatus,
110 ... mold,
120 ... mold body, 121 ... upper mold, 122 ... lower mold,
130: Detachable pin, 135: Convex part,
140 ... injection machine,
CA1 ... cavity,
D1 ... longitudinal direction, D2 ... light emission direction,
D3: a direction orthogonal to the longitudinal direction and the light emitting direction,
D4: Center of incident light traveling direction, D5: Example of reflected light traveling direction,
D11: longitudinal direction of the cavity,

Claims (5)

A long light guide obtained from a resin molding material ;
A light source for allowing light to enter the longitudinal end face of the light guide,
A plurality of recesses formed in one or more shapes selected from a cone shape and a frustum shape on the side surface of the light guide body so as to taper toward the inside of the light guide body in the longitudinal direction. Along the space ,
In the portion where the plurality of recesses are provided, the light guide has the light source side as a first part from the intermediate position in the longitudinal direction, and the side opposite to the light source from the intermediate position as a second part. The automobile illumination device , wherein the plurality of recesses are provided so that an average luminance of the second part is larger than an average luminance of the first part when the light source emits light .   The automotive lighting device according to claim 1, wherein the concave portion is roughened. It is a long light guide that is used in an automotive lighting device, is obtained from a resin molding material, and receives light from a light source from an end face in a longitudinal direction,
A plurality of concave portions formed in one or more shapes selected from a cone shape and a frustum shape on the side surface of the light guide body so as to taper toward the inside of the light guide body in the longitudinal direction. Along the space ,
In the portion where the plurality of recesses are provided, the light source side from the intermediate position in the longitudinal direction is the first part, and the side opposite to the light source from the intermediate position is the second part. The light guide according to claim 1, wherein the plurality of recesses are provided so that the average luminance of the second portion is larger than the average luminance of the first portion . A long light guide that is used in an automotive lighting device and receives light from a light source from an end surface in a longitudinal direction, and a plurality of recesses are provided on a side surface at intervals along the longitudinal direction. A method of manufacturing a light guide,
In the portion where the plurality of recesses of the light guide are provided, the light source side from the intermediate position in the longitudinal direction is the first part, the side opposite the light source from the intermediate position is the second part,
A convex part having one or more shapes selected from a conical shape and a frustum shape so that the forming die having a cavity for forming the long light guide is tapered toward the inside of the cavity. A plurality of detachable pins having protrusions formed with the plurality of recesses so that the average brightness of the second part is larger than the average brightness of the first part when the light source emits light. It is formed by detachably attaching to the mold body at intervals along the longitudinal direction of
It is filled with a resin molding material for molding the light guide to the mold cavity, a light guide, which comprises forming a light guide having a side surface a plurality of recesses by the plurality of detachable pins Body manufacturing method. The method for manufacturing a light guide according to claim 4 , wherein the convex portion of the detachable pin is roughened.

Images