JP2008174132A - Interior lighting system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large and thin interior lighting system for a vehicle capable of evenly lighting the whole interior and also improving an illumination stage effect. <P>SOLUTION: In this interior lighting system for the vehicle lighting the interior of the vehicle with a sunshine roof 10 arranged, a light guiding plate 20 that includes a light guiding member 22 having a structure that a light emitting surface 25 emitting light and an incident surface 26 on which light is made incident planarly intersect, and a light source 23 with a plurality of semiconductor light emitting elements arranged in parallel opposingly to the incident surface 26 of the light guiding member 22, is provided to the sunshine roof 10 with the light emitting surface directed to the interior side of the vehicle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle interior lighting device that illuminates the interior of a vehicle such as a passenger car on which a sunroof is installed.

  Many illumination lamps (room lamps, etc.) that illuminate the interior of a vehicle such as a passenger car are usually provided at or near the center of the ceiling surface in the vehicle interior (see, for example, Patent Document 1). In particular, indoor lamps installed in a wagon type vehicle or the like are large in size so as to illuminate a wide vehicle interior, and irradiate illumination light on a seat cushion surface, a floor surface, or the like in the vehicle interior.

  The illumination device as shown in Patent Document 1 uses an incandescent bulb as a light source, and the outside of the incandescent bulb is covered with a cover formed of a material such as a resin having diffuse transmission characteristics. . For this reason, a large thickness is required and the size is inevitably reduced. Therefore, it is difficult to uniformly illuminate the vehicle interior.

Accordingly, a light guide member having a configuration in which a light emitting surface that emits light and an incident surface on which the light is incident intersect each other, and a light source in which a plurality of semiconductor light emitting elements are arranged in parallel so as to face the incident surface of the light guide member There has also been proposed a vehicle interior light in which a light guide plate having a ceiling is attached to a ceiling and the interior of the vehicle is illuminated from the ceiling (see, for example, Patent Document 2). With the vehicular illumination lamp of Patent Document 1, it is possible to reduce the thickness and size of the vehicular lamp, and to uniformly illuminate the interior of the vehicle.
Japanese Utility Model Publication No. 54-3759 JP 2000-127847 A

  By the way, in vehicles, such as a passenger car in which a sunroof is installed, a vehicle interior illumination device for providing a light guide plate on the sunroof and illuminating the interior of the vehicle with the light guide plate has not existed conventionally. Therefore, the applicant of the present invention is advancing the research day by day, and if the light guide plate is provided on the sunroof, the design of the sunroof is improved, and a lighting device that illuminates the entire interior of the vehicle uniformly is obtained. At the same time, it was found that various lighting effects can be obtained.

  The present invention has been made in view of the above circumstances, and the object of the present invention is for a vehicle that is large and thin, can uniformly illuminate the entire vehicle compartment, and improves the lighting effect. The object is to provide a lighting device.

  A vehicle interior illumination device according to the present invention is a vehicle interior illumination device that illuminates the interior of a vehicle on which a sunroof is installed. A light guide plate having a light member and a light source in which a plurality of light emitting elements (for example, semiconductor light emitting elements) are arranged in parallel so as to face the incident surface of the light guide member, and the light emitting surface on the vehicle interior side The sunroof is provided so as to face.

  According to this configuration, a large-sized and thin illuminating device can be obtained by using the light guide plate that can be thinned as a whole sunroof and using this as a lighting fixture. And the whole interior of a vehicle can be illuminated uniformly using this illuminating device. In addition, when the light is arranged by changing the lighting order or location among a plurality of semiconductor light emitting elements, various lighting effects can be produced.

  In the above configuration, the light guide plate has a large number of conical recesses or protrusions on the entire back surface of the light guide member opposite to the light emitting surface, which diffuses the incident light toward the outside of the light emitting surface. It is possible to adopt a configuration provided over the entire area.

  According to this configuration, by providing a large number of conical concave portions or convex portions on the back surface opposite to the light emitting surface of the light guide member, the incident light is not necessarily diffused in the horizontal and vertical directions. The light can be diffused in all directions, so that the entire light emitting surface can emit light, the overall brightness is increased, and the interior of the vehicle can be felt bright. Moreover, an illumination effect and a three-dimensional effect are obtained by the conical concave portion or convex portion.

  The said structure can employ | adopt the structure provided with the glass roof formed with the said light-guide plate, and the shade provided so that it might overlap with the back side of this glass roof.

  According to this configuration, the light guide plate can be protected by the shade, and external light can be blocked by the shade, and light from the light guide plate can be prevented from leaking outside the vehicle.

  The said structure can employ | adopt the structure which consists of a glass roof with which the shade is not superimposed on the back side.

  According to this configuration, since the sunroof can be configured with the glass sunroof only by the light guide member, the manufacturing cost can be reduced and provided at a low cost.

  According to the present invention, it is possible to obtain an illumination effect that is large and thin, illuminates the entire passenger compartment uniformly, and makes the passenger compartment feel bright even with a small amount of light. In addition, since the entire sunroof can be made to emit light, the design of the sunroof can be improved. Furthermore, the light guide plate disposed on the sunroof provides a vehicle lighting device having an illumination effect and an illumination effect that has a three-dimensional effect on light.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is an overall plan view of a vehicle to which a vehicle illumination device according to the present invention is applied.

  In FIG. 1, a vehicle 1 according to the present embodiment is a three-row seat wagon type vehicle in which front seats 2, 2, first rear seats 3, 3, and second rear seat 4 are provided in the vehicle interior from the front side of the vehicle. It is. Further, the vehicle 1 is provided with front doors 5 and 5 corresponding to the front seats 2 and 2 and rear doors 6 and 6 corresponding to the first rear seats 3 and 3 on the side of the vehicle.

  The floor surface 7 in the passenger compartment is a flat surface extending substantially horizontally in the vehicle front-rear direction. On the floor surface 7, the left and right front seats 2, 2 and the first rear seats 3, 3 are separated from each other left and right, a central passage 8 is provided therebetween, and the front passage 2 is formed using the central passage 8. , 2 through the first rear seats 3 and 3 to the second rear seat 4 and vice versa.

  On the roof panel 9 of the vehicle 1, sunroofs 10 and 11 are installed at approximately the center and front of the roof panel 9 in the vehicle longitudinal direction.

  The sunroof 10 is a slide type sunroof that can be switched between a closed position that closes the sunroof opening 14 formed in the roof panel 9 and an open position that is slid rearward to open the sunroof opening 14. The movement of the sunroof 10 is guided by a pair of left and right roof guide rails 13 and 13 that are fixed to the inside of the roof panel 9 via a reinforcing frame 12 and extend in the vehicle longitudinal direction. FIG. 1 shows a state where the sunroof 10 is moved to the closed position and the sunroof opening 14 is closed.

  On the other hand, the sunroof 11 does not move in the vehicle front-rear direction, the rear end side pivots up and down with the front end side as a fulcrum, and the sunroof opening 15 formed in the roof panel 9 is closed, and the rear end This is a vertically-rotating sunroof that can be switched to an open position in which the part side is rotated upward to open the sunroof opening 15.

  The present invention can be applied to both the slide-type sunroof 10 and the vertically-rotated sunroof 11. However, in order to simplify the description, the present invention will be described as a case where the slide-type sunroof 10 is applied. Therefore, the present invention is not limited to the slide type sunroof.

  2 is an enlarged cross-sectional view of the roof portion along the line AA in FIG. 1 where the sunroof 10 is provided. In FIG. 2, the sunroof 10 is slidably attached to the pair of left and right roof rails 13 and 13 through a guide frame 16 having a rectangular frame shape. Reference numeral 17 denotes a skin panel that covers a portion of the roof panel 6 excluding the sunroof opening 14 and the sunroof opening 15 from the vehicle interior side.

  The sunroof 10 has a plate-like light guide plate 20 constituting a glass roof, and has a plate shape substantially the same size as the light guide plate 20, and is superimposed on the light guide plate 20. And a shade 19 having a light-shielding property integrated.

  As illustrated in FIGS. 3 to 5, the light guide plate 20 includes a housing 21, a light guide member 22, a light source 23, and the like.

  The housing 21 has a space in which the light guide member 22 and the light source 23 can be accommodated, and has a box-shaped synthetic resin housing main body 121 having an open surface, and a synthetic resin that is attached with the opening surface of the housing main body 121 closed. The lid body 122 is used. In addition, the housing body 121 and the lid body 122 are provided with opening windows 123 and 124 and light shielding portions 125 and 126, respectively, on surfaces facing each other. The opening windows 123 and 124 are windows for exposing the light guide member 22 accommodated in the housing 21, and the light shielding portions 125 and 126 are configured to prevent the light source 23 similarly accommodated in the housing 21 from being directly viewed from the outside. It is a cover of.

  The light guide member 22 is a plate material made of glass or synthetic resin (for example, polycarbonate resin, methacrylic resin, polymethyl methacrylate resin, etc.), the surface of which is a light emitting surface 25 that emits light, and the back surface thereof is One side end surface that is a reflection surface and intersects the light emitting surface 25 is an incident surface 26 on which light is incident, and the other side end surface is a reflection side end surface. In addition, on the back surface opposite to the light emitting surface 25, as shown in FIG. 6 in which a part of the back surface is enlarged, a large number of concave portions 27 having a small cone shape are provided over the entire surface. In this example, it is a conical recess, and the cross section shown in the figure forms a triangle. The concave portions 27 are provided at a predetermined pitch, for example, an equal pitch of 2 mm so that the light guide member 22 looks three-dimensionally and evenly with light light by the light emitted from the light emitting surface 25. Moreover, it is preferable that the diameter of the circle on the bottom surface of the conical shape is 0.4 mm. Furthermore, the inner surface of the light emitting surface 25 may be subjected to a textured process such as fine irregularities (texture pattern, embossing) or a reflective surface process.

  The light source 23 is composed of light emitting diodes (hereinafter referred to as LEDs) 28, 28... Which are a plurality of semiconductor light emitting elements that emit light in the same direction. The LEDs 28 are arranged in parallel in a row in the horizontal direction at a predetermined interval on the surface of the vertical wall plate-like printed board 29 extending in the horizontal direction so that the central axes of the LEDs 28 are in the horizontal direction. It is fixed. The printed circuit board 29 is a circuit board on which a lighting circuit that emits light from each of the LEDs 28, 28... Is printed, and the power line of the printed circuit board 29 is connected to a control circuit (not shown) on the vehicle body side to thereby each predetermined circuit. Can be turned on.

  Next, an example of the assembly procedure of the light guide plate 20 will be described. First, the light guide member 22 is disposed in the housing body 121. At this time, the incident surface 26 of the light guide member 22 is disposed on the light shielding part 125 side of the housing body 121. Next, the light source 23 is accommodated in the housing main body 121 together with the printed circuit board 29 along the incident surface 26 of the light guide member 22 at a position corresponding to the light shielding portion 125. Subsequently, the opening surface of the housing main body 121 is closed with the lid 122. At this time, the lid 122 is also arranged at a position where the light shielding portion 126 faces the light shielding portion 125 of the housing main body 121. As a result, the light source 23 and the printed circuit board 29 are covered with the light shielding portion 125 of the housing body 121 and the light shielding portion 126 of the lid body 122 so that they cannot be seen directly from the outside, and only the light guide member 22 has the opening windows 123 and 124. Assembled in an exposed state.

  Thereafter, the assembled light guide plate 20 is incorporated into the guide frame 16 together with the shade 19 to form a sunroof, which is incorporated into the roof portion of the vehicle body. In this case, the light guide plate 20 is assembled such that the light emitting surface 25 faces the vehicle interior side and the shade 19 overlaps the back surface opposite to the light emitting surface 25. Then, the guide frame 16 is attached to the roof guide rail 13 so that the light emitting surface 25 of the light guide plate 20 faces the vehicle interior side, and the power line of the printed circuit board 29 is connected to a control circuit (not shown) on the vehicle body side. The installation to the car body is completed. The light guide plate 20 incorporated in the sunroof 10 as a glass roof in this manner is used as an illumination device that illuminates the interior of the vehicle, and can be used as a large illumination device that emits light from substantially the entire interior of the glass roof. it can.

  FIG. 4 is an operation explanatory view of the light guide plate 20 constituting the glass roof. Next, the operation of the light guide plate 20 will be described with reference to FIG. The light guide plate 20 causes all the LEDs 28, 28... Of the light source 23 or a part thereof to emit light, and causes the light to enter the light guide member 22 from the incident surface 26. The light from each of the LEDs 28, 28... Spreads radially from the tip of the LED 28, and the plurality of LEDs 28, 28. Without incident.

  In this way, the light spread throughout the light guide member 22 is reflected and diffused by the irregular reflection surface 30 which is the back surface of the light guide member 22, and this reflected light is repeatedly reflected in the light guide member 22, Eventually, the light is emitted from the light emitting surface 25 to the outside (vehicle interior) to illuminate the vehicle interior. In this case, the irregular reflection surface 30 is formed with a large number of conical recesses 27, 27... Over the entire surface, so that light is irregularly reflected in multiple directions, and the vehicle interior is evenly distributed. Can be illuminated. These recesses 27 can also have an illumination effect by changing the cone shape.

  Furthermore, when the light source 23 in the light guide plate 20 is provided with alternately arranged blue LEDs, yellow LEDs, and white LEDs, and the LEDs 28, 28,... It is also possible to provide a production effect in which the light emission color is varied.

  The preferred embodiments of the present invention have been described above. However, the present invention can be variously modified and changed without departing from the concept of the claims.

  For example, in the above-described embodiment, the structure in which the conical concave portion 27 is provided on the irregular reflection surface 30 is disclosed, but similar irregular reflection can be obtained even if a convex portion is provided instead of the conical concave portion.

  In the embodiment described above, the LED is used as the semiconductor light emitting element, but other types of semiconductor light emitting elements can also be used.

  In the light guide plate 20 of the above embodiment, the incident surface 26 and the light source 23 are provided only on one end surface of the light guide member 22. However, the incident surface 26 and the light source 23 are provided on both end surfaces of the light guide member 22. May be.

  In the above embodiment, a glass roof made of the light guide plate 20 and a sunroof configuration in which the shade 19 is placed on the light guide plate 20 are arranged. However, for example, as shown in FIG. The sunroof 10 may be configured with only the glass roof 20. In this case, the structure can be simplified, and the cost can be reduced and provided at low cost. In FIG. 7, members denoted by the same reference numerals as those in FIGS. 1 to 6 are the same members as in FIGS. 1 to 6.

1 is an overall plan view of a vehicle to which a vehicle lighting device according to the present invention is applied. It is an expanded sectional view of the roof part along the AA line of FIG. It is the external appearance perspective view which looked at the light-guide plate shown in FIG.1 and FIG.2 from the back surface side. FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3. FIG. 4 is an exploded perspective view of the light guide plate shown in FIG. 3. It is operation | movement explanatory drawing of a light-guide plate. It is sectional drawing which shows one modification of a roof part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 9 Roof panel 10 Sunroof 11 Sunroof 13 Roof guide rail 14 Sunroof opening 15 Sunroof opening 19 Shade
20 Light guide plate 22 Light guide member 23 Light source 25 Light emitting surface 26 Incident surface 27 Recessed portion 28 LED (semiconductor light emitting element)
29 Printed circuit board 30 Reflecting surface

Claims (4)

In a vehicle interior lighting device that illuminates the interior of a vehicle in which a sunroof is installed,
A light guide member having a configuration in which a light emitting surface that emits light intersects with an incident surface on which the light is incident, and a light source in which a plurality of light emitting elements are arranged in parallel to face the incident surface of the light guide member. A vehicle interior lighting device, wherein the light guide plate is provided on the sunroof with the light emitting surface directed toward the interior of the vehicle.   The light guide plate is provided with a large number of conical concave portions or convex portions over the entire surface, which diffuses the incident light toward the outside of the light emitting surface on the back surface opposite to the light emitting surface of the light guide member. The vehicle interior lighting device according to claim 1.   The vehicle interior lighting device according to claim 1, wherein the sunroof includes a glass roof formed of the light guide plate and a shade provided so as to overlap the back side of the glass roof.   The vehicle interior lighting device according to claim 1, wherein the sunroof is a glass roof in which a shade is not superimposed on a back side.

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