JP4831097B2 - Vehicle interior lighting device - Google Patents

Description

  The present invention relates to an improvement in a vehicle interior lighting device for a vehicle.

Conventionally, a bulb is used as a light source in a lighting device such as a room lamp or a map lamp provided on the ceiling of a vehicle interior, but the thickness of the lighting device cannot be reduced due to heat radiation of the bulb. In addition, the difficulty in reducing the size of the bulb itself has hindered the thickness reduction of the lighting device. Considering installation in a limited space such as a vehicle interior ceiling, the lighting device is preferably thin in terms of improvement in installation flexibility. Moreover, it is desired that the design surface is also thin. Therefore, Patent Document 1 discloses an illumination device that uses a smaller LED lamp as a light source. The illumination device of Patent Document 1 includes a direct illumination unit and an indirect illumination unit, and directly illuminates the interior of the vehicle and also indirectly illuminates the interior by illuminating the interior ceiling. On the other hand, although it does not illuminate the inside of a vehicle, the illuminating device provided in a vehicle interior using an LED lamp is disclosed by patent document 2. FIG. The illumination device of Patent Document 2 illuminates a box-shaped storage section in a vehicle compartment, and a hologram process or the like is performed on the lid. The decorativeness is enhanced by such hologram processing.
JP 2001-138808 A JP 2002-298615 A

The lighting device of Patent Document 1 is thinned by the use of an LED lamp and exhibits two types of lighting modes (direct lighting and indirect lighting). Moreover, since the separate light source according to each illumination aspect is provided, there exists room for further size reduction and thickness reduction.
Accordingly, an object of the present invention is to provide a configuration that achieves both contradictory effects of thinning and a sense of depth and a three-dimensional effect in a vehicle interior lighting device including two types of illumination modes, direct illumination and indirect illumination.

In order to solve the above problems, the present invention has the following configuration. That is,
A vehicle interior lighting device provided on a vehicle interior ceiling,
A base, an LED lamp mounted on the base, a light diffusing member provided on the light emission side of the LED lamp, and diffusing the light of the LED lamp;
An optical sheet provided around the LED lamp mounting portion of the base body and subjected to hologram processing or prism processing;
A transparent cover that covers the LED lamp, the light diffusing member, and the optical sheet; and a first light transmitting portion that directly emits light traveling toward the vehicle interior of the diffused light from the light diffusing member into the vehicle interior. A transparent cover having a second light transmission portion that emits light diffused in the diffused light that travels toward the optical sheet and is reflected by the optical sheet;
With
It is a vehicle interior lighting device in which the optical sheet is observed from the vehicle interior via the second light transmission portion.

  The vehicle interior lighting device of the present invention is thinned by using an LED lamp as a light source. The light from the LED lamp is diffused by the light diffusing member, and a part of the diffused light is emitted from the first light transmitting portion of the transparent cover into the vehicle compartment. This directly illuminates the interior of the vehicle. On the other hand, part of the diffused light of the LED lamp travels to the optical sheet side to illuminate the optical sheet, and the optical sheet reflects the received light. This reflected light is emitted from the second light transmitting portion of the transparent cover into the vehicle interior to indirectly illuminate the vehicle interior. Further, the optical sheet is observed from the vehicle interior through the second light transmission part. The light emitted from the second light transmitting portion is subjected to hologram processing or prism processing on the optical sheet. According to the hologram processing, a predetermined three-dimensional image is formed on the illuminated optical sheet. Further, according to the prism processing, light that illuminates the optical sheet is reflected or polarized in a specific wavelength range. With these optical sheets, an observer can obtain a specific three-dimensional effect, a sense of depth, and a sense of quality. Thereby, the vehicle interior lighting device of the present invention exhibits high designability. As described above, according to the configuration of the present invention, while being thin, it gives an observer a unique stereoscopic feeling, depth feeling, and luxury feeling, and indirectly illuminates the direct illumination that illuminates the vehicle interior and the optical sheet. Thus, a vehicle interior lighting device that provides good interior illumination and high design is provided by two types of illumination modes, indirect lighting that illuminates the interior of the vehicle.

(LED lamp)
In the vehicle interior lighting device of the present invention, an LED lamp is used as a light source. The LED lamp has various advantages such as small size, low driving power, low calorific value, and long life. The type of the LED lamp is not particularly limited, and various types of LED lamps such as a bullet type (lens type), a surface mount (SMD) type, and a chip on board (COB) type can be adopted. It is preferable to adopt the SMD type. This is because the SMD type is small and contributes to thinning of the apparatus. The emission color of the LED lamp can be arbitrarily selected. For example, an LED lamp having an emission wavelength in the visible region such as white, red, amber, green, and blue can be employed. It is also possible to use an LED lamp that converts part of the light of the LED chip with a phosphor and emits light in which the light of the LED chip and fluorescence are mixed. The phosphor can be contained in, for example, a sealing resin for LED lamps. A layer containing a phosphor may be provided on the surface of the sealing resin.

  An LED lamp in which a plurality of LED chips of the same type or different types are incorporated can also be used. For example, if an LED lamp (3 in 1 LED lamp) in which LED chips of red, green, and blue are mounted on one substrate is used and the light emission mode of each LED chip is controlled, a desired color can be emitted. Thereby, the illuminating device which light-emits a desired luminescent color is comprised. A plurality of the same or different kinds of LED lamps may be used. For example, by using a combination of a white LED lamp and an amber LED lamp, the emission color can be made daytime color or light bulb color.

  The LED lamp is mounted on the substrate. The shape of the substrate is usually a flat plate shape, but is not limited to this, and the shape of the substrate is appropriately determined in consideration of the shape of the mounting portion of the vehicle interior lighting device of the present invention, the thickness and weight of the entire device, and the like. be able to. For example, when the vehicle interior ceiling is curved, a part of the base body may be curved along this. The material of the substrate is not particularly limited and can be appropriately determined in consideration of weight, moldability, cost, and the like. In general, the LED lamp is mounted on a substrate such as a glass epoxy substrate (FR-4) or a flexible substrate (FPC, Flexible Printed Circuit), and attached to the base via the substrate. When using a some LED lamp, it is preferable to arrange | position so that an LED lamp may be located in a line. This is because linear light can be generated. The lighting states of the plurality of LED lamps can be individually controlled. For example, lighting and extinguishing can be repeated in the order in which the LED lamps are arranged. In addition, when using 3 in 1 LED lamp, a gradation effect can be produced by changing light emission color gradually along the arrangement order of the LED lamp.

  A light diffusing member is provided on the light emitting side of the LED lamp. The light diffusing member can be formed by including a light diffusing agent in the light transmissive material. As the light diffusing agent, glass beads or metal powder having a predetermined particle size can be employed. In addition, the light diffusing member can be formed by performing light diffusing treatment on the surface of the light transmissive layer formed of the light transmissive material. The light diffusion treatment here can be performed by a known method, and examples thereof include application of white paint, embossing, and blasting. The light diffusing member preferably covers substantially the entire light emitting side of the LED lamp. That is, it is preferable to form a dome so as to cover the LED lamp. This is because more of the light from the LED lamp can be diffused. When a plurality of LED lamps are used, the light diffusing member can be formed in a dome shape so as to cover the plurality of LED lamps collectively.

An optical sheet that has been subjected to hologram processing or prism processing is provided around a portion of the substrate on which the LED lamp is mounted (also referred to as “LED lamp mounting portion” in this specification). When using a hologram-processed optical sheet, a hologram (pseudo three-dimensional image) is observed by light that illuminates the optical sheet. As a result, the observer can feel a unique stereoscopic effect and depth. The hologram processing applied to the optical sheet may be a known method. The shape of the hologram to be formed is not particularly limited, and may be a desired geometric figure, geometric pattern, arbitrary character, photograph or the like. Examples of the material of the optical sheet subjected to the hologram processing include a thin metal plate such as aluminum and SUS, PET (polyethylene terephthalate), PP (polypropylene), and the like.
When a prism-treated optical sheet is used, light that illuminates the optical sheet is reflected or polarized in a specific wavelength range. As a result, a three-dimensional effect and a sense of depth peculiar to the observer are given. The prism treatment can be performed by a known method. For example, fine V-shaped grooves can be formed at equal intervals on the surface of the optical sheet. In addition, a large number of microlenses may be formed at equal intervals on the surface of the optical sheet. The material of the optical sheet subjected to the prism treatment may be a film or a tape made of a light transmissive material such as acrylic, PC (polycarbonate) resin, PET resin, in addition to the metal plate. Among them, it is preferable that the optical sheet is made of a light-transmitting material, and a desired geometric figure, geometric pattern, arbitrary character, image or other image is provided on the back side of the optical sheet. This is because the observer can further feel a specific three-dimensional effect and a sense of depth by observing a polarized image or the like through the optical sheet. A combination of hologram processing and prism processing may be applied to the optical sheet. For example, prism processing can be performed on the surface of the optical sheet on the vehicle interior side, and hologram processing can be performed on the opposite surface. A plurality of optical sheets subjected to different types of hologram processing or prism processing may be used.

  The optical sheet can be provided as follows. A hole having a shape along the LED lamp mounting portion of the base is provided in the optical sheet, and the optical sheet can be placed on the base so that the hole overlaps the LED lamp mounting portion. If it does in this way, an optical sheet will be provided so that an LED lamp may be surrounded, and it will become easy for an optical sheet to receive the light of the LED lamp diffused by the light-diffusion member. When using a plurality of optical sheets, they can be laminated in the same shape as described above.

  In one embodiment of the present invention, an optical sheet is light transmissive, and an EL light emitter is provided between the optical sheet and the substrate. According to such a configuration, the light from the EL luminous body travels to the vehicle interior side via the light-transmitting optical sheet. Thereby, the three-dimensional feeling and depth feeling peculiar to an optical sheet increase. In addition to the light that illuminates the optical sheet (light from the LED lamp), the observer observes the optical sheet with higher luminance by the light of the EL light emitter, and the specific three-dimensional effect and the sense of depth are more strongly felt. Increases the quality of the equipment. The type of the EL light emitter is not particularly limited, and may be an organic EL light emitter or an inorganic EL light emitter. The EL light emitter is preferably provided so as to face substantially the entire surface of the optical sheet between the optical sheet and the substrate. This is because the entire optical sheet is observed with uniform brightness, and a high-class feeling is increased. The emission color of the EL light emitter is not particularly limited. A plurality of EL light emitters of the same type or different types may be used. The lighting control of the EL light emitter may be performed separately from the LED lamp, or may be interlocked with the lighting control of the LED lamp.

The vehicle interior lighting device of the present invention includes a transparent cover that covers the LED lamp, the light diffusion member, and the optical sheet. The transparent cover includes a first light transmitting portion that directly emits light traveling toward the vehicle interior of the diffused light from the light diffusing member into the vehicle interior, and travels toward the optical sheet within the diffused light by the optical sheet. And a second light transmission part that emits the reflected light into the vehicle interior, and the optical sheet is observed from the vehicle interior via the second light transmission part. The material of the transparent cover is not particularly limited as long as it is a light transmissive material such as PMMA (polymethyl methacrylate) resin, PC resin, PET resin, or glass. In addition, you may comprise a 1st light transmissive part and a 2nd light transmissive part by another body.
Hereinafter, based on an Example, this invention is demonstrated in detail.

FIG. 1A shows a perspective view of a vehicle 100 including a vehicle interior lighting device 1 according to an embodiment of the present invention, and FIG. 1B shows a perspective view of an indoor ceiling of the vehicle 100. A cross-sectional view taken along line AA in FIG. 1B is shown in FIG. As shown in FIGS. 1A and 1B, the vehicle interior lighting device 1 is provided at the center of the interior ceiling of the vehicle 1. The shape of the vehicle interior lighting device 1 is a long plate shape having a length of about 700 mm, a width of about 200 mm, and a thickness of about 10 mm. The longitudinal direction of the vehicle interior lighting device 1 is parallel to the longitudinal direction of the vehicle 100, the front end of the vehicle interior lighting device 1 is located on the ceiling of the front seat of the vehicle, and the rear end of the vehicle interior lighting device 1 is the rear seat of the vehicle. Located on the ceiling.
As shown in FIG. 2, the vehicle interior lighting device 1 includes a base body 10, an LED lamp 11, a light diffusing member 12, an optical sheet 13, a transparent cover 20, a front seat map lamp 30, a rear seat map lamp 40, switches 16, 31, 41 is provided. The substrate 10 is made of ABS resin and has a plate shape having a length of about 700 mm, a width of about 200 mm, and a thickness of about 2.0 mm. Six LED lamps 11 are provided at equal intervals on a central line parallel to the longitudinal direction of the substrate 10 via a substrate 14. Each of the six LED lamps 11 is an SMD type white LED lamp, and is a 3 in 1 type including a red LED chip, a green LED chip, and a blue LED chip. The LED lamp 11 is turned on / off by a switch 16 provided at each of the front and rear portions of the vehicle interior lighting device 1. A light diffusing member 12 is provided on the light emitting side of the LED lamp 11 (that is, the vehicle interior side). The light diffusing member 12 is an acrylic resin containing a milky white pigment. The shape of the light diffusing member 12 is a dome shape that protrudes toward the vehicle interior side, and surrounds the six LED lamps 11 together. Note that each optical axis 11 a of the six LED lamps 11 intersects the apex of the light diffusing member 12.

Optical sheets 13 are placed on the left and right sides of the light diffusing member 12 of the base 10 and fixed to the base 10 by a stopper 15 made of ABS resin. The optical sheet 13 is an aluminum metal film having a length of about 650 mm, a width of about 80 mm, and a thickness of about 1.0 mm. FIG. 3 shows a perspective view of the optical sheet 13 taken out and viewed from the vehicle interior side. A geometrical hologram is formed on the surface 13a of the optical sheet 13 on the vehicle interior side by a known method.
The transparent cover 20 is made of colorless and transparent PMMA, and is provided so as to cover the base 10, the LED lamp 11, the light diffusing member 12, and the optical sheet 13 together (see FIG. 2). On the vehicle interior side of the transparent cover 20, a plating portion 21 is provided along the left and right side portions of the light diffusing member 12 in plan view. The plated portion 21 has a wood grain tone and does not transmit light. In the transparent cover 20, the central band region sandwiched between the plating portions 21 is the first light transmission portion 22, and the other region is the second light transmission portion 23. As shown in FIG. 2, in the transparent cover 20, a region facing the light diffusing member 12 becomes the first light transmitting portion 22, and a region facing the optical sheet 13 becomes the second light transmitting portion 23. A plurality of claws 24 projecting inward are provided at the edge of the transparent cover 20, and engage with the recesses on the side of the base 10. As shown in FIG. 1B, two front seat map lamps 30 and two lighting control switches 31 are provided at the front of the vehicle interior lighting device 1. A bullet-type white LED lamp (not shown) is provided in the front seat map lamp 30. Similarly, two rear seat map lamps 40 and two lighting control switches 41 are provided at the rear of the vehicle interior lighting device 1, and a bullet-type white LED lamp is provided inside the rear seat map lamp 40. (Not shown).

Next, the light emission aspect of the vehicle interior lighting device 1 will be described. First, when the LED lamp 11 is turned on, the light from the LED lamp 11 first reaches the light diffusion member 12 and diffuses. Of the diffused light, the light traveling on the vehicle interior side (the light indicated by the symbol A in FIG. 2) is directly emitted into the vehicle interior via the first light transmitting portion 22 of the transparent cover 20. Thereby, the vehicle interior is illuminated. On the other hand, of the diffused light, the light traveling on the optical sheet 13 side (the light indicated by the symbol B in FIG. 2) illuminates the optical sheet 13, and the optical sheet 13 reflects the received light. This reflected light is emitted from the second light transmitting portion 23 of the transparent cover 20 into the vehicle compartment. In addition, a part of the diffused light traveling to the second light transmitting portion 23 side is reflected on the optical sheet 13 side without entering the transparent cover 20 due to surface reflection. The optical sheet 13 receives such reflected light (light indicated by reference numeral C in FIG. 2), reflects it to the vehicle interior side, and emits it from the second light transmitting portion 23 of the transparent cover 20 into the vehicle interior. In this way, the optical sheet 13 is observed from the vehicle compartment. That is, the light emitted from the second light transmission part 23 indirectly illuminates the vehicle interior.
Furthermore, as shown in FIG. 3, a geometrical hologram 13a is formed on the surface of the optical sheet 13 on the vehicle interior side. An observer in the vehicle compartment visually recognizes the hologram 13 a through the second light transmission part 23 of the transparent cover 20. Thereby, a three-dimensional effect and a sense of depth peculiar to an observer are given. Although the vehicle lighting device 1 is as thin as about 10 mm in thickness, the vehicle lighting device 1 exhibits high designability due to such a unique three-dimensional feeling and depth feeling.

  It is also conceivable that a special cutting is provided on the outer lens (transparent cover) of the vehicle interior lighting device, or a solid lens is used to produce a three-dimensional effect and a sense of depth. However, in the vehicle interior lighting device 1 of the present embodiment, by using the optical sheet 13, it is not necessary to provide a special cutting or the like on the outer lens (transparent cover 20) or use a compression lens. Thereby, the transparent cover 20 can be made thin and weight reduction can be achieved. Moreover, it is easy to mold and is advantageous in terms of cost.

  The LED lamp 11 is a 3-in-1 type white LED lamp, which can emit full color light, and can perform various lighting control with color change. For example, not only monochromatic light emission but also different light emission colors in the front seat portion and the rear seat portion, or the light emission color gradually changes (gradation change) from the LED lamp 11 on the front seat side toward the LED lamp 11 on the rear seat side. The lighting can be controlled. Furthermore, the lighting timing of each LED lamp 11 is changed or the emission color is changed at a desired timing so that light flows from the front seat portion to the rear seat portion or from the rear seat portion to the front seat portion. can do.

4A shows a perspective view of a vehicle interior lighting device 5 which is another embodiment of the present invention, and FIG. 4B shows a cross-sectional view taken along line BB in FIG. 4A. In addition, the same code | symbol is attached | subjected to the member equivalent to the vehicle interior lighting device 1, and the description is abbreviate | omitted.
As shown in FIG. 4B, an EL light emitter 50 and an optical sheet 130 are laminated on the base 10 in this order on the left and right of the light diffusion member 12 of the base 10, respectively. The EL light emitter 50 is an organic EL white light emitter. The shape of the EL light emitter 50 is slightly smaller than that of the optical sheet 130, and the light emitting surface of the EL light emitter 50 faces the optical sheet 130. The EL light emitter 50 is turned on in conjunction with the lighting state of the LED lamp 11 by a control circuit (not shown). The optical sheet 130 is a colorless and transparent sheet made of PET. V-grooves having a depth of 0.03 mm are formed at a pitch of 0.3 mm on substantially the entire surface (front surface) on the vehicle interior side. It has become. As shown in FIG. 6, a geometric pattern 130 a is printed with a white paint on the surface (back surface) opposite to the vehicle interior of the optical sheet 130.

  In the vehicle interior lighting device 5, the light from the LED lamp 11 is diffused by the light diffusing member 12, and a part of the diffused light illuminates the optical sheet 130 from the vehicle interior side, and the light from the EL light emitter 50 is optical sheet 130. Is illuminated from the back side. Since the front surface of the optical sheet 130 is subjected to prism processing, the light that illuminates the optical sheet 130 is polarized. As a result, the observer observes the geometric pattern 130a on the back surface of the optical sheet 130 with a specific stereoscopic effect and a sense of depth. Thereby, although it is thin like the vehicle interior lighting device 1, a high design property is exhibited due to a specific three-dimensional effect and a sense of depth. In this embodiment, the lighting state of the EL light emitter 50 is linked to the lighting state of the LED lamp 11, but the present invention is not limited to this, and a switch for controlling the lighting state of the EL light emitter 50 is separately provided and manually controlled. May be.

  The vehicle interior lighting device of the present invention can be used for various vehicles.

The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.
The contents of papers, published patent gazettes, patent gazettes, and the like specified in this specification are incorporated by reference in their entirety.

FIG. 1A is a perspective view of a vehicle 100 including a vehicle interior lighting device 1 according to an embodiment of the present invention, and FIG. 1B is a perspective view of the vehicle interior lighting device 1. It is the sectional view on the AA line in FIG. 2 is a front perspective view of an optical sheet 13. FIG. 4A is a perspective view of a vehicle interior lighting device 5 according to another embodiment, and FIG. 4B is a cross-sectional view taken along line BB in FIG. 4A. 4 is a rear perspective view of the optical sheet 130. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Vehicle 1, 5 Vehicle interior illuminating device 10 Base | substrate 11 LED lamp 12 Light diffusing member 13, 130 Optical sheet 13a Hologram 130a Geometric pattern 14 Substrate 15 Stopper 16, 31, 41 Switch 20 Transparent cover 21 Plating part 22 1st light transmission Part 23 second light transmission part 30 front seat map lamp 40 rear seat map lamp 50 EL light emitter

Claims (6)

A vehicle interior lighting device provided on a vehicle interior ceiling,
A base, an LED lamp mounted on the base, a light diffusing member provided on the light emission side of the LED lamp, and diffusing the light of the LED lamp;
An optical sheet provided around the LED lamp mounting portion of the base body and subjected to hologram processing or prism processing;
A transparent cover that covers the LED lamp, the light diffusing member, and the optical sheet; and a first light transmitting portion that directly emits light traveling toward the vehicle interior of the diffused light from the light diffusing member into the vehicle interior. A transparent cover having a second light transmission portion that emits light diffused in the diffused light that travels toward the optical sheet and is reflected by the optical sheet;
With
A vehicle interior lighting device in which the optical sheet is observed from the interior of the vehicle through the second light transmission portion.   2. The vehicle interior lighting device according to claim 1, wherein the optical sheet is light transmissive, and an EL light emitter is provided between the optical sheet and the base body.   The vehicle interior lighting device according to claim 2, wherein the EL light emitter faces substantially the entire surface of the optical sheet between the optical sheet and the base body. A plurality of the LED lamps are provided, and the plurality of LED lamps are arranged in a line,
The optical sheet is disposed so as to surround the LED lamp,
The first light transmission part of the transparent cover is formed linearly along the plurality of LED lamps, and the second light transmission part is formed to surround the first light transmission part.
The vehicle interior lighting device according to any one of claims 1 to 3, wherein   5. The vehicle interior illumination according to claim 4, wherein one end of the first light transmission part is located on a ceiling of a front seat of the vehicle, and the other end of the first light transmission part is located on a ceiling of the rear seat of the vehicle. apparatus.   The vehicle interior lighting device according to claim 5, wherein a longitudinal direction of the first light transmission portion is parallel to a longitudinal direction of the vehicle.

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