JP2016199220A - Luminaire for vehicle cabin interior space - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire for a vehicle cabin interior space which enables optical control with a three dimentional physical relationship between lighting and a radiation surface divided in vertical and lateral directions.SOLUTION: A luminaire 1 for a vehicle cabin interior space has: a light source 11; a lens part 30 having a first surface 31, which is exposed to a vehicle cabin inner side and has a predetermined light emitting area, and a second surface 32 located at a back side of the first surface 31; and a transparent material 20 which is disposed spaced a predetermined distance away from the lens part 30 and includes: an incident part 21 into which light from the light source 11 enters; and an emission part 22 from which the light entered from the incident part 21 emits toward the second surface 32 of the lens part 30. The lens part 30 is integrally molded with the transparent material 20. The transparent material 20 has a light control part 25 which reflects the light entered from the incident part 21 to the emission part 22 side. The light control part 25a is formed at a front side of a position corresponding to the lens part 30. The luminaire 1 has a region 29, in which the light control part is not formed, at a position corresponding to an end part 30e of the lens part 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle interior lighting device.

  Conventionally, various structures have been adopted as a device for illuminating the interior of a car or the like (hereinafter referred to as “vehicle interior”). For example, a lighting device has been proposed in which a mirror provided in a sun visor can be used even in an environment where the surroundings are dark (for example, Patent Document 1).

  The illuminating device of Patent Document 1 includes a light source and a light guide plate, and the light guide plate is arranged and formed as a continuous surface that draws a curved ridge line in which a specular reflective surface is concave toward the light source, The light whose directivity is controlled by the light source disposed on the end face of the light guide plate is uniformly emitted from a wide area. An optical control surface is set on the back and front of the lens surface in order to suppress luminance and emit light from the entire lens surface.

JP 2009-87887 A

  However, in the illumination device of Patent Document 1, there is a luminance difference with the vicinity of the light source, and when the area of the light guide is increased, it is difficult to uniformly illuminate the entire light guide with one light source.

  Accordingly, the present invention has been made in view of the above problems, and provides a vehicle interior lighting device capable of optical control by dividing a three-dimensional positional relationship between an illumination and an irradiation surface into a vertical direction and a horizontal direction. The purpose is that.

  In order to solve the above problems, (1) a vehicle interior lighting device includes a light source, a first surface exposed to the vehicle interior side and having a predetermined light emitting area, and a second surface on the back surface side of the first surface. A lens unit having a predetermined space with respect to the lens, an incident unit that receives light from the light source, and an incident unit that emits light incident from the incident unit toward the second surface of the lens unit A light guide having a light emitting part, and a connecting part connecting the lens part and the light guide, the lens part being integrally formed with the light guide, and the light guide A light control unit configured to reflect the light incident from the incident unit toward the output unit, the light control unit being formed from a position corresponding to the lens unit, and an end of the lens unit; There is a region in which the light control unit is not formed at a position corresponding to.

(2) In the above (1), the region where the light control unit is not formed is provided in a region of ± 5 ° with the end of the lens unit as the center.
(3) In the above (1) or (2), the light guide is formed between the incident portion and the emission portion, and has a curved shape having a diffusing function, and at least the lens from the curved portion. A main body portion formed along the portion, and the main body portion includes a linear portion formed on the curved portion side from a position corresponding to an end portion on the curved portion side of the lens portion, and the curved portion The length of the part is formed in the range of 1 to 5 times the length of the straight line part.
(4) In the above (1) or (2), the main body portion has a linear portion formed on the bending portion side from a position corresponding to the end portion on the bending portion side of the lens portion, and the light control portion Is formed from the straight portion.
(5) The distance from the incident part to the emission part is in the range of 30 mm to 100 mm.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device for vehicle interiors which can optically control by dividing | segmenting the three-dimensional positional relationship of illumination and an irradiation surface into the vertical direction and a horizontal direction can be provided.

It is a figure which shows the positional relationship of the illuminating device for vehicle interior (henceforth "illuminating device") and the mirror which concern on embodiment of this invention. (A) is a figure for demonstrating the irradiation range in the vehicle width direction of an irradiation apparatus, (b) is a figure for demonstrating the irradiation range in the vehicle up-down direction of the illuminating device which concerns on embodiment of this invention. It is the figure which looked at the unit incorporating the irradiation apparatus which concerns on embodiment of this invention from the room inner side. (A) is the top view which looked at the irradiation apparatus which concerns on embodiment of this invention from the lens side, (b) is AA sectional drawing of (a). (A) is the front view of the irradiation apparatus which concerns on embodiment of this invention, (b) is the perspective view seen from right diagonally upward direction, (c) is the perspective view seen from diagonally left upward direction, (d) is a bottom face FIG. 4E is a perspective view seen from a slightly rear side of the right side surface. It is a figure for demonstrating the extraction direction of the metal mold | die of the illuminating device which concerns on embodiment of this invention. It is a figure for demonstrating the problem of the light guide part of the illuminating device which concerns on embodiment of this invention, and the edge part of a lens part. It is a figure for demonstrating the light control part formed in the light guide part of the illuminating device which concerns on embodiment of this invention. (A) is a figure for demonstrating the light guide part and lens part in the illuminating device which concerns on embodiment of this invention, (b) is a figure explaining a comparative example, (c) is a figure explaining a comparative example. .

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a positional relationship between a vehicle interior lighting device and a mirror according to an embodiment of the present invention. As shown in FIG. 1, a lighting device 1 according to an embodiment of the present invention is provided on a vehicle ceiling material 5 so that a mirror 3 provided on a sun visor 2 can be used even in a dark environment. It is. The user A lowers the sun visor 2, opens the opening / closing lid 3 a, and is irradiated with uniform light from the illumination device 1 when viewing the mirror 3.

FIG. 2A is a diagram for explaining an irradiation range in the vehicle width direction of the irradiation device, and FIG. 2B is a diagram for explaining an irradiation range in the vehicle vertical direction of the illumination device according to the embodiment of the present invention. .
As shown in FIGS. 2 (a) and 2 (b), the lighting device 1 has a three-dimensional positional relationship between the illumination and the irradiation surface (user) in the vehicle width direction (horizontal direction) X and the vertical direction of the vehicle (vertical direction). ) Optical control is possible by dividing into Y. Thus, by making the light emitting surface wide, it is possible to prevent shadows on the face when illuminating the user.

  FIG. 3 is a view of a unit in which the irradiation apparatus according to the embodiment of the present invention is incorporated as viewed from the indoor side. As shown in FIG. 3, the lighting device 1 is unitized by the cover member 10 and attached to the vehicle ceiling material so that the first surface 31 of the lens unit 30 is exposed to the vehicle interior side.

  Fig.4 (a) is the top view which looked at the irradiation apparatus which concerns on embodiment of this invention from the lens side, (b) is AA sectional drawing of (a). 5A is a front view of the irradiation apparatus according to the embodiment of the present invention, FIG. 5B is a perspective view seen from the upper right direction, FIG. 5C is a perspective view seen from the upper left direction, and FIG. Is a bottom view, and (e) is a perspective view as seen from slightly behind the right side.

  As shown in FIGS. 4 and 5, the lighting device 1 connects the light source 11, the light guide (light guide lens) 20, the lens unit (prism lens) 30, and the light guide 20 and the lens unit 30. It has the 1st connection part 40 and the 2nd connection part 41. FIG. Furthermore, the illuminating device 1 is provided with the cover member 10 as shown in FIG. The light in the horizontal direction is controlled by the light guide, and the control in the vertical direction is performed by the lens unit 30. In the lighting device 1, the light guide 20, the lens unit 30, the first connecting unit 40, and the second connecting unit 41 are integrally formed of resin.

  As the material of the lighting device 1, an inorganic material such as polycarbonate (PC), methacryl (PMMA), or glass can be used.

The light source 11 is constituted by a light emitting element such as a light emitting diode (LED), and is placed on the substrate 12.
The light guide 20 is disposed behind the lens unit 30 with a predetermined space from the lens unit 30. The light guide 20 is formed between the incident part 21, the emission part 22, the curved part 23 having a diffusing function, formed between the incident part 21 and the emission part 22, and has a rod shape. And at least a main body portion 24 formed linearly along the lens portion. Since the light guide 20 guides light in the longitudinal direction, even a long light emitting surface can emit light uniformly.

An incident portion 21 that receives light from the light source is formed at the end of the bending portion 23.
The main body portion 24 is formed along at least the lens portion 30, and includes an emission portion 22 that emits light incident from the incidence portion 21 toward the second surface 32 of the lens portion 30. The emitting portion 22 is a light emitting region, and is provided to be positioned below the center of the main body portion 24 so as to face the second surface 32 of the lens portion 30.

  The main body portion 24 is formed with a light control portion (lens cut) 25 that reflects the light incident from the incident portion 21 toward the emission portion 22 side. The cross section of the main body portion 24 is formed in a circular shape, and has a cutout portion 26 that is partially cut away so that the light control portion 25 can be easily formed. The light control part 25 is formed in the site | part which the output part 22 opposes, as shown in FIG.4 (b). The light control unit 25 controls the lateral diffusion of the lighting device 1. The light control unit 25 is formed by a prism, for example. The light that enters from the incident portion 21 is guided in the light guide 20, the light is controlled in the direction of the lens portion 30 by the light control portion 25, and the light is emitted from the emission portion 22 toward the second surface 32 of the lens portion 30. Emitted.

The main body portion 24 has a straight portion 28 formed on the curved portion 23 side from a position corresponding to the end portion on the curved portion 23 side of the lens portion 30, and the light control portion 25 continues from the straight portion 28 of the main body portion 24. Is formed. The light guided through the bending portion 23 and the main body portion 24 is reflected by the light control portion 25 and emitted from the emission portion 22 toward the lens portion 30.
The curved portion 23 has a curved shape in order to provide a diffusion function, and the radius of curvature at the inner diameter of the curved portion 23 is 25 mm to 100 mm, preferably 30 mm to 40 mm.

  The lens unit 30 includes a first surface 31 that is exposed to the vehicle interior side and has a predetermined light emitting area, a second surface 32 on the back side of the first surface 31, and an attachment unit for attaching the lens unit 30 to the cover member 10. 33. The lens unit 30 includes a region 30 a having a constant thickness and a region 30 b in which the thickness decreases as the distance from the light guide 20 increases. By widening the light emitting surface by the lens unit 30, it is possible to provide a lighting device that can be made to be a long and narrow design and that does not cast shadows on the face.

  The first surface 31 of the lens unit 30 has a curved cross-sectional shape. The first surface 31 of the lens unit 30 is not controlled in the vertical and horizontal directions of light, and optical control is performed at a portion other than the lens surface, so that the positional relationship and irradiation intensity do not affect the design. it can. The first surface 31 of the lens unit 30 may be subjected to surface processing such as a texture. Forming a texture on the first surface 31 of the lens unit 30 can improve the merchantability of the appearance, further reducing glare and luminance, and enabling uniform light emission.

  The lens unit 30 is formed such that a plurality of prisms for diffusing light on the second surface 32 extend in the longitudinal direction of the light guide 20. Vertical diffusion is controlled by a prism formed on the second surface 32 of the lens unit 30.

  The light guide 20 and the lens unit 30 are connected by a first connecting unit 40 and a second connecting unit 41. By fixing the lens by the first connecting portion 40 and the second connecting portion 41, it is possible to eliminate an optical loss and unevenness by eliminating an attachment structure to a part that is optically used.

  The first connecting part 40 is connected to the vicinity of the incident part 21 of the light guide 20. By connecting the first connecting portion 40 to the terminal closest to the incident portion 21, light that enters the first connecting portion 40 and is lost can be minimized. On the other hand, when the first connecting portion 40 is connected to the position closer to the main body portion 24 than the incident portion 21, light is refracted in the bending portion 23, and thus light leaks to the first connecting portion 40 side. , It becomes a loss of light. For this reason, it is preferable to connect the 1st connection part 40 to the vicinity of the incident part 21 in which the refraction of light is not advancing within the bending part 23. FIG.

  Moreover, it is preferable that the cross-sectional area of the 1st connection part 40 is 5 to 30% of the cross-sectional area of the curved part 23 of the light guide 20. FIG. If the cross-sectional area of the first connecting portion 40 is smaller than 5% of the cross-sectional area of the curved portion 23 of the light guide 20, the loss of light can be suppressed, but the strength becomes weak. On the other hand, if the cross-sectional area of the first connecting portion 40 is larger than 30% of the cross-sectional area of the curved portion 23 of the light guide 20, the strength increases, but the lost light cannot be suppressed. For this reason, it is good for the cross-sectional area of the 1st connection part 40 to be 5-30% of the cross-sectional area of the curved part 23 of the light guide 20. FIG.

  FIG. 6 is a view for explaining a mold drawing direction of the lighting device according to the embodiment of the present invention. As shown in FIGS. 4A and 6, the lens unit 30 is formed in a region that does not overlap the light guide 20 in the mold drawing direction (vertical direction). The light guide 20, the lens part 30, the first connection part 40, and the second connection part 41 can be integrally formed. This can reduce the die cost. By integrally forming the light guide 20, the lens unit 30, the first connecting unit 40, and the second connecting unit 41, the fixing structure of the lens unit 30 can be reduced and the number of parts can be reduced. .

FIG. 7 is a view for explaining problems of the light guide unit and the end of the lens unit of the illumination device according to the embodiment of the present invention. FIG. 8 is a diagram for explaining a light control unit formed in the light guide unit of the illumination device according to the embodiment of the present invention.
As illustrated in FIG. 8, the light guide 20 may be viewed directly from the gap S between the lens unit 30 and the cover member 10. When the light control unit 25 is formed from the front of the position corresponding to the lens unit 30 in the portion of the light guide 20 where the light guide 20 can be directly viewed from the gap between the lens unit 30 and the cover member 10, the light guide 20. The glare is generated by the action of the light control unit 25 formed in the above.

  A region 29 where the light control unit is not formed is provided at a position corresponding to the end 30e of the lens unit 30, and the light control units 25a and 25b are formed before and after the region. The region 29 where the light control unit is not formed is provided in a region of ± 5 ° (θ = 10 °) with the end of the lens unit 30 as the center. With this configuration, since the light emitted from the light guide 20 is not generated, the portion can be prevented from being dazzled even when the light guide 20 can be directly viewed.

FIG. 9A is a diagram for explaining the light guide unit and the lens unit in the illumination device according to the embodiment of the present invention, FIG. 9B is a diagram for explaining a comparative example, and FIG. 9C is a diagram for explaining the comparative example. It is.
As shown in FIG. 9A, the light guide 20 is formed with a curved portion 23 to provide a diffusion function. When the light guide 20 is entirely linear without providing the bending portion 23, the amount of light traveling in a straight line increases, and the light control unit 25 formed on the main body 24 of the light guide directs toward the lens unit 30. Therefore, the amount of light reflected through the main body 24 is increased. That is, when the connecting portion between the incident portion 21 and the main body portion 24 is linear, the light from the light source is uniformly transmitted through the light guide, so that the intensity of the light is likely to occur. By providing the curved portion 23, the light transmitted from the incident portion 21 through the light guide 20 is diffused, so that unevenness of the light emitted from the emitting portion 22 is reduced.

  The curved portion 23 is preferably formed with a radius of curvature of 25 mm to 100 mm, and more preferably a radius of curvature of 30 mm to 40 mm, in order to efficiently diffuse the light entering from the incident portion 21. It is good to be formed. If the radius of curvature is too smaller than 25 mm, light will go out of the light guide 20 from the curved portion 23. On the other hand, when the value of the radius of curvature is greater than 100 mm, the diffusion state at the curved portion 23 is reduced, and the amount of light that is not reflected by the light control portion 25 of the main body portion 24 but is linearly increased. For this reason, it is preferable that the value of the radius of curvature is the above-mentioned numerical value that secures the minimum angle at which the light guide phenomenon occurs without light coming out of the curved portion 23.

Further, as shown in FIG. 9A, the linear main body 24 has a linear portion 28 formed on the curved portion 23 side from a position corresponding to the end portion on the curved portion 23 side of the lens portion 30. The length of the curved portion 23 is preferably formed in the range of 1 to 5 times the length of the linear portion 28.
Specifically, the angle θ formed by the curved portion 23 is preferably 30 to 60 °, and when the radius of curvature is 30 mm, the length of the curved portion 23 is 20 mm to 40 mm. The straight portion 28 is preferably 10 mm or more. Therefore, the total length of the bending portion 23 and the straight portion 28 is preferably 30 mm to 50 mm, that is, the length 20 mm to 40 mm of the bending portion 23 + the straight portion 10 mm.
As shown in FIG. 9B, if the straight portion 28a to the second surface 32 of the lens portion 30 of the main body portion 24 is too long, the efficiency of the space deteriorates. Further, as shown in FIG. 9C, if the distance of the curved portion 23 ′ is too short, unevenness occurs because sufficient diffusion is not performed inside the curved portion 23 ′.

  Moreover, it is preferable that the distance from the incident part 21 to the output part 22 is the range of 30 mm-100 mm, More preferably, it is the range of 35 mm-50 mm. In order to uniformly diffuse the light beam in the main body 24 of the light guide 20 and reach the emission part 22 which is a light emitting area, the incidence part 21 and the emission part 22 are separated from each other by the above distance, thereby causing unevenness in the emission part 22. A light emitting state with no emission can be obtained. Although it is effective against unevenness as the distance from the incident portion 21 to the emission portion 22 is increased, a loss of space, component size, and light occurs.

  Note that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within a scope in which the object of the present invention can be achieved are included in the present invention. In the embodiment of the present invention, the vehicle interior light device is an example in which the mirror provided on the sun visor is used in an illumination device that can be used even in an environment where the surroundings are dark. Without being limited, the present invention can be applied to other lighting devices as long as the lighting device is used in the vehicle interior.

1 Illumination device 11 Light source 12 Substrate
20 light guide 21 incident part 22 exit part 23 bending part 24 body part 25 light control part 30 lens part 31 first surface 32 second surface 33 attachment part 40 first connection part 41 second connection part

Claims (5)

A light source;
A lens portion having a first surface exposed to the vehicle interior side and having a predetermined light emitting area, and a second surface on the back side of the first surface;
An incident portion that is disposed with a predetermined space with respect to the lens and that receives light from the light source, and an emission portion that emits light incident from the incident portion toward the second surface of the lens portion. A light guide having
A connecting portion for connecting the lens portion and the light guide,
The lens part is integrally molded with the light guide;
The light guide includes a light control unit that reflects light incident from the incident unit toward the emitting unit,
The light control unit is formed from the front of the position corresponding to the lens unit,
A vehicle interior lighting device having a region where the light control unit is not formed at a position corresponding to an end of the lens unit.   2. The vehicle interior lighting device according to claim 1, wherein a region where the light control unit is not formed is provided in a region of ± 5 ° centering on an end portion of the lens unit. The light guide is
A curved portion having a diffusing function, which is formed between the incident portion and the emitting portion, and
A main body portion formed along at least the lens portion from the curved portion,
The main body has a linear portion formed on the curved portion side from a position corresponding to an end portion on the curved portion side of the lens portion,
The length of the curved portion is formed in the range of 1 to 5 times the length of the linear portion,
The illumination device for a vehicle interior according to claim 1 or 2, wherein The main body has a linear portion formed on the curved portion side from a position corresponding to an end portion on the curved portion side of the lens portion,
The light control unit is formed from the straight portion,
The vehicle interior lighting device according to claim 3. The distance from the incident part to the emitting part is in the range of 30 mm to 100 mm.
The vehicle interior lighting device according to any one of claims 1 to 4, wherein the lighting device is for a vehicle room.

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