JP2012201346A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device adapted to be thinned and miniaturized.SOLUTION: An illumination device 10 includes a substrate 1, a first illumination section 2 emitting first illumination light, and a second illumination section 3 emitting second illumination light in an area narrower than the first illumination section 2. The first illumination section 2 has a sheet-like light guide 12 along one side surface 1a of the substrate 1 and a first light source getting the first illumination light in such a way that light is introduced to the light guide 12 and transmitted in the surface direction. The second illumination section 3 has a second light source 13 mounted in the one side surface 1a of the substrate 1 and an optical path changing section 14 making light from the second light source 13 as the second illumination light by directing it in the inclination direction. The optical path changing section 14 has a light concentrating element 21 narrowing a light emitting area. The light concentrating element 21 is a Fresnel lens and is arranged by shifting an optical axis AX1 in a direction corresponding to the inclination direction with respect to an optical axis AX2 of the second light source 13 in such a way that it is positioned along the substrate 1.

Description

  The present invention relates to an illuminating device that can be used for a vehicle interior lamp or the like.

  As a lighting device used for a vehicle interior light or the like, a room lamp that illuminates a wide range (for example, the entire interior of the vehicle) and a map lamp that selectively illuminates a narrow range (for example, a driver or a passenger in a passenger seat) There is something with. As the map lamp, for example, a light source (LED or the like) inclined toward the driver seat and the passenger seat can be used (see, for example, Patent Document 1). However, the illuminating device having this structure has a problem that the entire thickness dimension becomes large because a large space is required for the light source in an inclined state.

  As an illuminating device, there is one that adopts a structure in which illumination light is directed in an inclined direction by changing an optical path of light that has passed through a light guide plate by a prism lens (see, for example, Patent Document 2). Since the illumination device having this structure employs a prism lens that changes the optical path, there is an advantage that the degree of freedom in designing the posture and arrangement of the light source is high.

JP 2008-094317 A JP 2010-149762 A

However, in the illuminating device, in order to obtain a sufficient inclination angle of the illumination light, it is necessary to install the light guide plate and the prism lens in an inclined manner. For this reason, since a plurality of light guide plates are required or a structure for fixing the light guide plate and the prism lens is required, it is difficult to reduce the thickness and size.
In addition, in order to obtain a sufficient coupling efficiency between the light source and the light guide plate, it is necessary to install a substrate on which the light source is mounted in accordance with the light guide plate. Therefore, the shape and arrangement of the substrate are factors that increase the thickness of the apparatus. There was sometimes. In addition, the illumination device requires separate switches for turning on and off the light source and adjusting the amount of light, so that the structure is complicated and it is difficult to reduce the thickness and size.
This invention is made | formed in view of the said situation, and it aims at providing the illuminating device which can be reduced in thickness and size.

In order to solve the above problems, the present invention provides the following configuration.
The present invention includes a substrate, a first illumination unit that emits first illumination light, and a second illumination unit that emits second illumination light in a narrower range than the first illumination unit, and the first illumination unit includes , A sheet-like light guide along one surface of the substrate, and a first light source that introduces light into the light guide and propagates it in the surface direction to obtain the first illumination light, and the second light source. The illumination unit changes the optical path of the second light source mounted on one surface of the substrate and the light from the second light source as the second illumination light in a direction inclined with respect to a direction perpendicular to the substrate. The optical path changing unit has a condensing element that narrows the light emission range, and the condensing element is a Fresnel lens, and is inclined with respect to the optical axis of the second light source. An illumination device characterized in that the optical axis position is shifted in a direction according to a direction and is in a posture along the substrate. Subjected to.
It is preferable that the condensing element is movable with respect to the second light source, and the displacement of the optical axis with respect to the optical axis of the second light source can be adjusted by the movement.
The optical path changing unit may include a photorefractive element that refracts the light and directs the light in the tilt direction.
The substrate preferably includes a detection sensor for detecting proximity or contact of the detection target.
The illumination device of the present invention may further include a cover unit that covers the substrate, the first illumination unit, and the second light source, and the cover unit may be integrated with the light collecting element.

According to the present invention, since the condensing element is provided with the optical axis position shifted from the optical axis of the second light source, the second illumination light inclined at a sufficient angle can be obtained. There is no need to place the elements at an angle. Moreover, since the Fresnel lens is used, the thickness dimension of the condensing element can be reduced. Therefore, the device can be reduced in thickness and size.
Moreover, since the condensing element is in a posture along the substrate, the apparatus can have a flat plate structure.
In addition, since both the first illuminating unit and the second illuminating unit are provided on one substrate and the light guide is provided along the substrate, a plurality of substrates are required, or the light guide is inclined. Compared with the case where arrangement is required, the apparatus configuration is simple, and from this point, it is suitable for thinning and miniaturization.
Since the lighting device of the present invention can be manufactured by a simple procedure of providing a light guide, a light source, etc. on one side of a substrate on which electronic components are mounted in advance, manufacturing is easy and cost reduction is possible. There is also an advantage of being.
In addition, since the second light source of the second illumination unit is provided on the substrate, even when a high-power light source is used, heat generated by the light source is dispersed throughout the substrate, preventing local temperature rise and ensuring stable operation. it can.

It is sectional drawing which shows the principal part of the illuminating device of 1st Embodiment of the illuminating device of this invention. It is sectional drawing which shows the 2nd illumination part of the illuminating device of FIG. It is sectional drawing which shows the 2nd light source and condensing element of the illuminating device of FIG. It is a whole sectional view of the illuminating device of FIG. 1, and is a figure which shows the A1-A1 cross section of FIG. It is a whole sectional view of the illuminating device of FIG. 1, and is a figure which shows the A2-A2 cross section of FIG. It is a top view of the illuminating device of FIG. It is sectional drawing which decomposes | disassembles and shows the 2nd illumination part of the illuminating device of FIG. 1, and is sectional drawing which follows the X direction of FIG. It is sectional drawing which decomposes | disassembles and shows the 1st illumination part of the illuminating device of FIG. 1, and is sectional drawing which follows the Y direction of FIG. It is sectional drawing of the 1st illumination part of the illuminating device of FIG. It is sectional drawing of an example of the board | substrate which can be used for the illuminating device of FIG. It is a top view of an example of the light guide which can be used for the illuminating device of FIG. It is a top view of the other example of the light guide which can be used for the illuminating device of FIG. It is sectional drawing which shows typically the principal part of 1st Embodiment of the illuminating device of this invention. It is a figure which shows typically the 2nd light source and condensing element of the illuminating device of FIG. It is a figure which shows a test device typically. It is a figure which shows illuminance distribution. It is a figure which shows illuminance distribution. It is a graph which shows a test result. It is sectional drawing which shows the principal part of 2nd Embodiment of the illuminating device of this invention. It is sectional drawing which shows operation | movement of the illuminating device of FIG. It is sectional drawing which shows operation | movement of the illuminating device of FIG. It is sectional drawing which shows the principal part of 3rd Embodiment of the illuminating device of this invention. It is sectional drawing which shows the principal part of 4th Embodiment of the illuminating device of this invention. It is sectional drawing which shows the principal part of 5th Embodiment of the illuminating device of this invention. It is sectional drawing which shows the principal part of 6th Embodiment of the illuminating device of this invention. It is sectional drawing which shows the principal part of 7th Embodiment of the illuminating device of this invention. It is sectional drawing which shows the principal part of 8th Embodiment of the illuminating device of this invention. It is sectional drawing which shows the condensing element and the photorefractive element of the illuminating device of FIG. It is an expanded sectional view which shows the condensing element and photorefractive element of the illuminating device of FIG.

The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 is a cross-sectional view showing the main part of the illumination device 10 according to the first embodiment of the present invention, and is a view showing a cross section (A1-A1 cross section) along the X direction in FIG. FIG. 2 is a cross-sectional view showing the second illumination unit 3 of the illumination device 10. FIG. 3 is a cross-sectional view showing the condensing element 21 of the illumination device 10. FIG. 4 is an overall cross-sectional view of the illumination device 10 and is a view showing a cross section A1-A1 of FIG. FIG. 5 is an overall cross-sectional view of the illumination device 10, and is a view showing a cross section A2-A2 of FIG. FIG. 6 is a plan view of the lighting device 10. FIG. 7 is an exploded cross-sectional view of the second illumination unit 3 of the illumination device 10, and is a cross-sectional view along the X direction of FIG. FIG. 8 is an exploded cross-sectional view of the first illumination unit 2 of the illumination device 10, and is a cross-sectional view along the Y direction of FIG. FIG. 9 is a cross-sectional view of the first lighting unit 2 of the lighting device 10. FIG. 10 is a cross-sectional view of an example of the substrate 1 that can be used in the lighting device 10. FIG. 11 is a plan view of an example of the light guide 12 that can be used in the lighting device 10. FIG. 12 is a plan view of another example of the light guide 12 that can be used in the lighting device 10. FIG. 13 is a cross-sectional view schematically showing the main part of the illumination device 10. FIG. 14 is a diagram schematically showing the second light source 13 and the condensing element 21.

First, with reference to FIG. 13 and FIG. 14, the outline | summary of the illuminating device 10 is demonstrated.
As shown in FIG. 13, the illumination device 10 includes a substrate 1, a first illumination unit 2 that emits first illumination light, and a second illumination unit 3 that emits second illumination light in a range narrower than the first illumination unit 2. And the cover part 4 which covers these is provided.
The first illumination unit 2 includes a sheet-like light guide 12 along one surface 1 a of the substrate 1 and a first light source 11 that introduces light into the light guide 12.
A light extraction portion 16 that scatters incident light and extracts (emits) it to the lower surface 12 d side of the light guide 12 can be formed on the upper surface 12 c of the light guide 12.

The second illumination unit 3 is a second light source 13 mounted on one surface 1 a of the substrate 1, and the light from the second light source 13 is converted into second illumination light LA inclined with respect to a direction V 1 perpendicular to the substrate 1. And an optical path changing unit 14.
The optical path changing unit 14 includes a condensing element 21 that narrows the emission range of light from the second light source 13.
The condensing element 21 is a Fresnel lens, and the position of the optical axis AX1 of the condensing element 21 is shifted from the position of the optical axis AX2 of the second light source 13. This shift direction is a direction according to the second illumination light LA. In the illustrated example, the optical axis AX1 of the light condensing element 21 is on the left side of the optical axis AX2 of the second light source 13, and thereby the second illumination light LA inclined leftward is obtained.

In the first illumination unit 2, the light L emitted from the first light source 11 enters the light guide 12 and propagates through the light guide 12. A part of the light propagating in the light guide 12 is scattered by the light extraction unit 16 and extracted to the lower surface 12d side. Since the light extraction part 16 is formed over the wide range of the upper surface 12c of the light guide 12, the 1st illumination light LC which is planar light emission is obtained.
The first illumination light illuminates a wide range (for example, the entire interior of the vehicle) where the illumination device 10 is installed.

  In the second illuminating unit 3, the light L <b> 1 emitted from the second light source 13 enters the condensing element 21 to narrow the emission range, and responds to a shift in the optical axis position between the condensing element 21 and the second light source 13. Are inclined and emitted as the second illumination light LA. In the illustrated example, since the optical axis AX1 of the condensing element 21 is on the left side of the optical axis AX2 of the second light source 13, the second illumination light LA inclined leftward is obtained.

FIG. 14 is a schematic diagram showing the relationship between the optical axis positions of the light collecting element 21 and the second light source 13 and the emitted light.
As shown in this figure, when the light L1 emitted from the second light source 13 enters the condensing element 21 having the optical axis AX1 at a position shifted to the left from the optical axis AX2 of the second light source 13, this optical axis. In response to the positional deviation, the light is emitted as the second illumination light LA inclined leftward with respect to the direction V1 perpendicular to the substrate 1.
The second illumination light selectively illuminates a narrow range (for example, the hand of a driver or a passenger in the passenger seat) compared to the first illumination light.

Next, the illumination device 10 will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 4 to 6, the illumination device 10 emits the second illumination light in a range narrower than the substrate 1, the first illumination unit 2 that emits the first illumination light, and the first illumination unit. It has the 2nd illumination part 3, the cover part 4 which covers these, and the flame | frame part 5 to which the cover part 4 is attached.
The illuminating device 10 can be installed, for example, on the ceiling of a vehicle and used as an interior lamp. As shown in FIGS. 4 and 5, the lighting device 10 can be installed in a vehicle by fixing the frame portion 5 to an interior material 6 of the vehicle, for example.

  As shown in FIGS. 5 and 6, the first illuminating unit 2 includes a sheet-like light guide 12 installed along one surface 1 a (lower surface or surface) of the substrate 1, and light to the light guide 12. The 1st light source 11 which introduces. The 1st illumination part 2 can be used as a room lamp which illuminates a wide range (for example, the whole vehicle interior).

The first light source 11 is composed of one or a plurality of light sources 11 a mounted on one surface 1 a of the substrate 1. In this example, as shown in FIG. 6, the first light source 11 includes a plurality of light sources 11 a, and these light sources 11 a are arranged along one end portion 12 a of the light guide 12.
The one end portion 12a provided with the light source 11a in this example is one of the four side portions of the light guide 12 having a substantially rectangular shape in plan view, and more specifically, one length of the light guide 12 having a substantially rectangular shape. It is an edge. The light source 11a can be installed in a partial range including the central portion in the length direction of the one end portion 12a. The number and positions of the light sources 11a are determined so that the brightness of the first illumination light introduced into the light guide 12 and surface-emitted does not vary.

As shown in FIGS. 8 and 9, the light source 11 a is installed with the light emitting surface 11 b facing the end surface 12 b of the one end portion 12 a of the light guide 12.
As the light source 11a, a light emitting diode (hereinafter referred to as LED) (light emitting element) can be used. In addition, the light emitting element used as the light source 11a is not limited to the LED but may be a cold cathode tube.

The light guide 12 is made of a transparent light transmissive resin, and for example, urethane resin, acrylic resin, polycarbonate resin, silicone resin, polystyrene resin, polyimide resin, polymethyl methacrylate (PMMA) elastomer, urethane acrylate, or the like is used. it can.
As shown in FIG. 9, when the thickness T1 of the light guide 12 is set equal to or greater than the height H1 of the light source 11a, the light introduction efficiency from the light source 11a is increased, and the luminance of the first illumination light is increased. And the illuminance can be increased.

As shown in FIG. 9, the lower surface 12d (the other surface or surface) of the light guide 12 is scattered on the upper surface 12c (one surface or the back surface) which is the surface of the light guide 12 on the substrate 1 side. It is possible to form a light extraction portion 16 that is extracted (emitted) to the side. The light extraction portion 16 can be formed in a part or all of the upper surface 12c. By forming the light extraction part 16 in a wide range, the light in the light guide 12 is extracted to the lower surface 12d side as surface light emission (first illumination light).
The light extraction portion 16 can be formed to emit light over the entire area of the light guide 12 by being uniformly formed over the entire area of the upper surface 12c. The 1st illumination part 2 functions as a planar light-emitting device.

  The light extraction unit 16 can be a plurality of microdot-like ink layers (hereinafter simply referred to as microdots) formed by printing, for example. The planar view shape of the minute dots may be arbitrary, such as a circle, an ellipse, or a polygon (such as a rectangle). The minute dots can be formed by a printing method such as a screen printing method, a gravure printing method, or a pad printing method.

As the ink constituting the fine dots, for example, white ink using titanium oxide as a pigment is suitable. Since titanium oxide functions as a white pigment, the ink exhibits a white color. When the titanium oxide content of the ink is 5 to 50% by mass or more, preferably 10 to 40% by mass or more, high luminance can be obtained.
Examples of titanium oxide include rutile type and anatase type, and rutile type titanium oxide is particularly preferable.
In order to emit white light, it is necessary to uniformly scatter the entire visible light. Here, considering the relationship between the wavelength to be scattered and the particle size of titanium oxide, the particle size of titanium oxide is preferably 10 nm to 0.5 μm.
The light extraction portion is not limited to the ink layer, and may be a notch formed on the surface of the light guide, or a rough surface portion formed by sandblasting or the like.

  As shown in FIGS. 4 and 5, the other surface 1b (upper surface or back surface) of the substrate 1 is provided with an electronic component 17 (such as a semiconductor element) for turning on and off the light sources 11 and 13 and adjusting the amount of light. 17a to 17c) are implemented. As the electronic component 17, a publicly known one can be used.

As shown in FIG. 10, the substrate 1 is preferably provided with a touch pad 30 (detection sensor). The touch pad 30 includes an input sensor 31 and a resist layer 32 (covering resin layer) formed on one surface thereof.
The input sensor 31 is a sensor that detects the proximity or contact of a detection target such as a human finger. Here, the input sensor 31 is a capacitance type input sensor, and has a configuration in which the wiring layer 34 is provided on one surface of the base material 33. Since the capacitance type input sensor 31 has a simple structure including a single substrate 33 and a wiring layer 34, it can be thinned.

  The base material 33 is a plate material made of a resin such as PET. The base material 33 may be a flexible substrate made of PEN (polyethylene naphthalate), polyimide, or the like, or a rigid substrate made of glass epoxy resin or the like.

The wiring layer 34 has, for example, a plurality of electrodes 34a. When an object to be detected such as a human finger approaches, an electrostatic capacity is formed between the object to be detected and the electrode 34a, and this capacitance is determined by an opposing area or a separation distance between the object to be detected and the electrode 34a. It depends on. For this reason, the detected object and the electrode 34a form a variable capacitance section.
A change in the capacitance of the variable capacitance unit is detected by a detection means (not shown), and an input operation by the detection target, its position, and the like are grasped by a control unit (not shown) based on the detected value.

The wiring layer 34 can be formed, for example, by heating a silver paste containing silver particles after screen printing on the substrate 33. The wiring layer 34 may be formed by etching a copper foil laminated on the base material 33.
The resist layer 32 secures electrical insulation between the wiring layers 34 and prevents oxidation, and the base material 33 and the wiring layer 34 are formed on one surface (surface on the light guide 12 side) side of the input sensor 31. It is formed to cover. For example, a general-purpose solder resist can be used as the resist layer 32.

As shown in FIGS. 5, 8, and 9, a mask 18 having a light shielding property can be provided on the lower surface side of the range including the first light source 11 and the one end 12 a of the light guide 12. The mask 18 in the illustrated example is formed from the first light source 11 to the one end 12 a of the light guide 12. The mask 18 is preferably made of a white material.
By providing the mask 18, the light from the first light source 11 can be prevented from leaking to the outside, and the efficiency of introducing the light into the light guide 12 can be increased. Moreover, it can prevent that the brightness | luminance in the 1st light source 11 and its vicinity becomes high locally.

As shown in FIGS. 1 to 4 and 6, the second illumination unit 3 includes a second light source 13 mounted on one surface 1 a of the substrate 1 and light from the second light source 13 perpendicular to the substrate 1. And an optical path changing unit 14 as second illumination light in a direction inclined with respect to the direction V1.
The 2nd illumination part 3 can be used as a map lamp (spot lamp) which selectively illuminates a narrow range (for example, a driver | operator's or passenger's passenger's hand).

As shown in FIGS. 1, 2, 4, and 6, the second light source 13 is mounted on one surface 1 a of the substrate 1. In this example, two second light sources 13 are provided on the substrate 1 apart from each other.
As the 2nd light source 13, a light emitting diode (henceforth LED) (light emitting element) can be used. The light emitting element used as the second light source 13 may be a cold cathode tube. The number of the second light sources 13 is not limited to the illustrated example, and may be 1 or 3 or more.

The light guide 12 is formed with an opening 15 that can accommodate the second light source 13.
As shown in FIG. 11, the shape of the opening 15 in plan view is not particularly limited, and may be a circle as shown in this figure, or may be another shape such as an ellipse or a rectangle. The opening 15 is not limited to a closed shape (see FIG. 11) surrounding the second light source 13, but may be an open shape reaching the edge 12e of the light guide 12 as shown in FIG.

As shown in FIG. 2, the opening 15 in this example is formed so as to gradually increase in diameter from the upper surface 12c toward the lower surface 12d. That is, the inner surface 15b of the peripheral edge portion 15a of the opening 15 is inclined so as to gradually move away from the second light source 13 from the upper surface 12c toward the lower surface 12d.
In the opening 15, the light reflected by the inner surface 15 b of the peripheral edge 15 a travels downward, so that the amount of second illumination light increases.

At least a part of the inner surface 15b of the peripheral edge portion 15a can be a reflecting surface that reflects light from the second light source 13. The entire inner surface 15b is preferably a reflective surface.
The reflective surface of the inner surface 15b is preferably one that can efficiently reflect light from the second light source 13. For example, the inner surface 15b can be made a reflective surface by using a paint (for example, mirror ink) containing metal powder. In order to make the inner surface 15b a reflecting surface, a metal thin film may be formed on the inner surface 15b by a known method.
By using the inner surface 15b as a reflecting surface, the light from the second light source 13 can be efficiently directed to the optical path changing unit 14 to increase the light use efficiency.

At least a part of the inner surface 15b of the peripheral edge portion 15a can also function as a light shielding surface that blocks light from the first light source 11. Accordingly, it is possible to prevent light from the first light source 11 propagating through the light guide 12 from leaking from the inner surface 15b, and it is possible to prevent the use efficiency of light from the first light source 11 from being lowered.
The reflection surface that reflects the light from the second light source 13 also functions as a light shielding surface that blocks the light from the first light source 11. In addition, when a reflecting surface is formed on the inner surface 15b, the light from the first light source 11 is also reflected in the light guide 12, and the utilization efficiency thereof can be increased.

  The opening 15 may be formed so as to gradually reduce the diameter from the upper surface 12c toward the lower surface 12d. In the opening portion 15 having this shape, the peripheral edge portion 15a functions as an aperture, and the light emission range from the second light source 13 can be reduced and the light condensing performance can be enhanced. Moreover, the opening part 15 can also be made into a fixed internal diameter.

As shown in FIGS. 2 and 3, the optical path changing unit 14 includes a light condensing element 21 that narrows the emission range of light from the second light source 13.
The condensing element 21 may be designed according to the spread angle of the light from the second light source 13 and the inclination angle of the light required for the light emitted from the condensing element 21. A part of a curved surface such as an object surface, a cylindrical surface, or an elliptical cylindrical surface may be a main shape, or a shape obtained by combining a plurality of these curved surfaces.

  As shown in FIG. 3, the light collecting element 21 in the illustrated example is a Fresnel lens in which a plurality of convex lenses are concentrically combined. And a second outer peripheral portion 21c formed on the outer peripheral side of the first outer peripheral portion 21b, and a third outer peripheral portion 21d formed on the outer peripheral side of the second outer peripheral portion 21c. The central portion 21a and the outer peripheral portions 21b to 21d are lenses having a curved surface on the lower surface 21e side.

The outermost peripheral part of the second outer peripheral part 21c is thinner than the innermost peripheral part of the third outer peripheral part 21d, the outermost peripheral part of the first outer peripheral part 21b is thinner than the innermost peripheral part of the second outer peripheral part 21c, and The outermost periphery is thinner than the innermost periphery of the first outer periphery 21b. Due to this structure, the condensing element 21 of this example is thinner than a normal convex lens.
The upper surface 21f of the condensing element 21 is a flat surface along one surface 1a of the substrate 1 and is substantially parallel to the surface 1a (see FIG. 2). For this reason, the condensing element 21 is in a posture along the substrate 1.

  It is preferable that the condensing element 21 can collimate the light from the second light source 13. In the example shown in FIG. 3, the emitted light L <b> 1 from the second light source 13 becomes the second illumination light LA that is parallel light by the condensing element 21. Note that the condensing element 21 is not necessarily parallelized as long as the light emission range from the second light source 13 can be sufficiently narrowed.

As shown in FIGS. 2 and 3, the position of the optical axis AX1 of the condensing element 21 is shifted from the position of the optical axis AX2 of the second light source 13.
The optical axis AX2 is a line along the traveling direction of light at the center of the light beam emitted from the second light source 13, and passes through the center of the second light source 13 in the illustrated example and is perpendicular to one surface 1a of the substrate 1. The optical axis AX1 is, for example, a line along the rotationally symmetric central axis of the condensing element 21 and passes through the center of the condensing element 21 in the illustrated example and is perpendicular to one surface 1a of the substrate 1.
In the illustrated example, the positional deviation of the optical axes AX1 and AX2 is an in-plane positional deviation along the one surface 1a of the substrate 1.

The direction of deviation of the optical axis AX1 of the condensing element 21 with respect to the optical axis AX2 of the second light source 13 is a direction corresponding to the inclination direction of the second illumination light.
As shown in FIG. 1, in the second illumination unit 3 (3 </ b> A) located on the left side, the optical axis AX <b> 1 of the condensing element 21 is on the left side with respect to the optical axis AX <b> 2 of the second light source 13. The second illumination light LA inclined leftward with respect to the correct direction V1 is obtained. In the second illumination unit 3 (3B) located on the right, the optical axis AX1 of the light condensing element 21 is on the right side of the optical axis AX2 of the second light source 13, and the second illumination light LB tilted to the right with respect to the direction V1. Is obtained.

As shown in FIGS. 2, 3, 6, and 7, the light collecting element 21 is fitted into the mounting opening 4 a formed on the lower plate 4 b of the cover 4 and fixed to the peripheral edge of the mounting opening 4 a. can do.
Since the condensing element 21 is installed in the attachment opening 4 a of the cover part 4, it does not protrude from the cover part 4. For this reason, the condensing element 21 is hardly damaged by an external force.

As shown in FIGS. 4 and 5, the cover portion 4 covers and protects the substrate 1, the first illumination portion 2, and the second light source 13, and includes a flat plate-like lower plate portion 4b and its peripheral edge. And a side plate portion 4c formed on the side plate. The cover portion 4 can be attached to the frame portion 5 by locking a locking claw portion 4d formed outward on the side plate portion 4c in the locking hole 5a of the frame portion 5.
The cover portion 4 is preferably made of a transparent material that can transmit light, and is made of, for example, resin or glass.

Next, the illumination light obtained by the 1st illumination part 2 and the 2nd illumination part 3 of the illuminating device 10 is demonstrated.
As shown in FIGS. 5, 6, and 9, in the first illumination unit 2, the light emitted from the first light source 11 (light source 11 a) is incident on the light guide 12 from the end surface 12 b of the one end portion 12 a, and The light propagates through the light guide 12 mainly toward the other end portion 12f (see FIGS. 5 and 6) while being reflected by the surface 12c, the lower surface 12d, and the like.
A part of the light propagating in the light guide 12 is scattered by the light extraction unit 16 and extracted to the lower surface 12d side. Since the light extraction part 16 is formed over the wide range of the upper surface 12c of the light guide 12, the 1st illumination light which is planar light emission is obtained.
Since the 1st illumination light illuminates the wide range (for example, the whole vehicle interior) where the illuminating device 10 is installed, the 1st illumination part 2 can be used as a room lamp.

As shown in FIGS. 1 to 4, in the second illumination unit 3, the light L <b> 1 (see FIG. 3) emitted from the second light source 13 is diffused light that spreads in the emission direction. The incident light is narrowed and the emission range is narrowed, and the light is emitted as the second illumination lights LA and LB inclined according to the deviation of the optical axis positions of the light collecting element 21 and the second light source 13.
In FIG. 1, in the second illumination unit 3 (3 </ b> A) located on the left side, the optical axis AX <b> 1 of the condensing element 21 is on the left side with respect to the optical axis AX <b> 2 of the second light source 13. On the other hand, the second illumination light LA inclined leftward is obtained. In the second illumination unit 3 (3B) located on the right, the optical axis AX1 of the light condensing element 21 is on the right side of the optical axis AX2 of the second light source 13, and therefore the second illumination light tilted to the right with respect to the direction V1. LB is obtained.
The angles of the second illumination lights LA and LB (inclination angle θ shown in FIGS. 1 and 14) with respect to the direction V1 perpendicular to the substrate 1 are, for example, not less than 1 ° and not more than 45 °.
The inclination angle of the second illumination light is, for example, an angle with respect to the direction V1 of the light traveling direction at the light flux center of the second illumination light.
1 and the like show that the second illumination lights LA and LB are inclined in the left-right direction, but the second illumination light may be inclined in a direction other than the illustrated direction. For example, the second illumination light may be inclined in a direction (front side or back side with respect to the paper surface) perpendicular to the paper surface in FIG.
The second illumination unit 3 is used as a map lamp (spot lamp) because the second illumination light selectively illuminates a narrow range (for example, the hand of the driver or passenger in the passenger seat) compared to the first illumination light. it can.

Hereinafter, with reference to FIGS. 15 to 18, it will be described that tilted light is obtained by shifting the optical axis positions of the condensing element 21 and the second light source 13.
As shown in FIG. 15, a test apparatus in which a light condensing element 21 (Fresnel lens having a focal length of 5.0 mm, an effective diameter of 50 mm, and a thickness of 0.5 mm) is arranged facing the second light source 13 (white light LED) is used. The second light source 13 is caused to emit light, and the illumination light 20 transmitted through the light condensing element 21 is projected onto the screen 19. The distance between the second light source 13 and the condensing element 21 was 5 mm, and the distance from the second light source 13 to the screen 19 was 70 cm.

FIG. 16 shows the illuminance distribution of the illumination light 20 when the optical axis AX1 of the light condensing element 21 coincides with the optical axis AX2 of the second light source 13. As shown in this figure, the illumination light 20 has the highest illuminance at the origin of this coordinate system.
FIG. 17 shows the illuminance distribution of the illumination light 20 when the optical axis AX1 of the light condensing element 21 is shifted from the optical axis AX2 of the second light source 13 by 2 mm. As shown in this figure, the portion with the highest illuminance of the illumination light 20 is shifted in the same direction as the shift of the optical axis AX1 of the condensing element 21 in comparison with FIG.

FIG. 18 is a graph showing the relationship between the light tilt angle (tilt angle θ shown in FIG. 14) due to the optical axis conversion and the deviation of the optical axis AX1 of the condensing element 21 with respect to the optical axis AX2 of the second light source 13. . The horizontal axis is the shift of the optical axis AX1 with respect to the optical axis AX2, and the vertical axis is the tilt angle of light.
As shown in this figure, the tilt angle and the optical axis deviation have a positive correlation. That is, the greater the deviation of the optical axis AX1 of the condensing element 21 from the optical axis AX2 of the second light source 13, the greater the light inclination angle.
From these test results, when the optical axis AX1 of the condensing element 21 is at a position shifted from the optical axis AX2 of the second light source 13, the light passing through the condensing element 21 is shifted in the direction of deviation by optical axis conversion. It can be seen that the angle of inclination is a value corresponding to the amount of deviation of the optical axis.

In the illuminating device 10, since the condensing element 21 of the second illumination unit 3 is provided with the position of the optical axis AX1 shifted from the optical axis AX2 of the second light source 13, the second illumination inclined at a sufficient angle. Light is obtained. This eliminates the need for the light collecting element 21 to be inclined. Moreover, the thickness dimension of the condensing element 21 can be made small by using a Fresnel lens. Therefore, the device can be reduced in thickness and size.
Moreover, since the condensing element 21 can be made into the attitude | position along the board | substrate 1, an apparatus can be made into a flat structure.
In the lighting device 10, since both the first lighting unit 2 and the second lighting unit 3 are provided on one substrate 1 and the light guide 12 is also provided along the substrate 1, a plurality of substrates is required. Compared with the case where an inclined arrangement of a light guide or the like is required, the apparatus configuration is simple, and from this point, it is suitable for thinning and miniaturization.

Since the lighting device 10 can be manufactured by a simple procedure of providing the light guide 12, the light sources 11, 13 and the like on the one surface 1a side of the substrate 1 on which the electronic component 17 is mounted in advance, it is easy to manufacture and low There is also an advantage that the cost can be reduced.
In addition, since the second illumination unit 3 is provided on the substrate 1, even when a high-power second light source 13 is used, the heat generated by the light source 13 is dispersed throughout the substrate 1 to prevent a local temperature rise and stable. Can be secured.
In particular, since both the first illuminating unit 2 and the second illuminating unit 3 are provided on one substrate 1, even when a high output light source 11 or 13 is used, the heat generated by the light sources 11 and 13 is generated on the substrate 1. It can be dispersed throughout to prevent local temperature rise and ensure stable operation.

  Note that the condensing element 21 may be inclined in a direction corresponding to the second illumination light with respect to the substrate 1 as long as the thinning and downsizing of the lighting device 10 can be achieved.

FIG. 19 is a cross-sectional view showing a part of a lighting apparatus according to the second embodiment of the present invention.
In the description of each embodiment below, the same reference numerals are assigned to the same components as those in the first embodiment, and the description thereof may be omitted.
In this embodiment, a movable housing recess 4g is formed on the inner surface of the attachment opening 4a of the cover 4. The movable housing recess 4g has an inner diameter that is larger than the outer diameter of the light collecting element 21, and allows the light collecting element 21 to move in the direction along the substrate 1.
For this reason, as shown in FIG. 20 and FIG. 21, the condensing element 21 is in contact with the upper surface 4h of the movable housing recess 4g and is restricted from moving in the height direction, and is moved along the substrate 1 in the left-right direction in the figure. It is movable.

This illuminating device can arbitrarily determine the position of the optical axis AX1 of the condensing element 21, and can adjust the amount of deviation of the optical axis AX1 of the condensing element 21 with respect to the optical axis AX2 of the second light source 13. Therefore, the inclination angle of the second illumination light can be arbitrarily set.
In addition, the moving direction of the condensing element 21 is not limited to the direction along the substrate 1 as long as the shift amount of the optical axis AX1 of the condensing element 21 with respect to the optical axis AX2 of the second light source 13 can be adjusted.

FIG. 22 is a cross-sectional view showing a part of a lighting apparatus according to the third embodiment of the present invention.
In this embodiment, the attachment opening 4 a is not formed in the cover 4, and the condensing element 21 is provided on the lower surface 4 e side of the lower plate portion 4 b of the cover 4. About another structure, it can be set as the same as the illuminating device 10 of 1st Embodiment shown in FIG.
This lighting device has a simple structure because the cover portion 4 does not have the attachment port portion 4a, and does not require an operation of fitting the optical path changing portion 14 into the attachment port portion 4a, and is easy to manufacture.

FIG. 23 is a cross-sectional view showing a part of a lighting apparatus according to the fourth embodiment of the present invention.
In this embodiment, the condensing element 21 is provided not on the lower surface 4e side of the lower plate portion 4b of the cover portion 4 but on the upper surface 4f (surface on the second light source 13 side) side. It is different from the illumination device of the embodiment. Other configurations can be the same as those in the third embodiment.
As in the third embodiment, this lighting device has an advantage that it is easy to manufacture and that the condensing element 21 is not exposed to the outside, so that it is not easily damaged by an external force.

FIG. 24 is a cross-sectional view showing a part of a lighting apparatus according to the fifth embodiment of the present invention.
This embodiment differs from the illumination device of the third embodiment shown in FIG. 22 in that the condensing element 21 is provided on both the lower surface 4e side and the upper surface 4f side of the lower plate portion 4b of the cover portion 4. . Other configurations can be the same as those in the third embodiment.
In 3rd-5th embodiment, the condensing element 21 may be a different body from the cover part 4, and can also be formed integrally.

FIG. 25 is a cross-sectional view showing a part of a lighting apparatus according to the sixth embodiment of the present invention.
The illuminating device of this embodiment has the same configuration as the illuminating device 10 shown in FIG. 2 and the like except that the condensing element 21 is integrated with the cover portion 4. Specifically, the peripheral part of the condensing element 21 is formed integrally with the peripheral part of the attachment port part 4a (the inner surface of the attachment port part 4a). The condensing element 21 and the cover part 4 can be produced by integral molding.
In this illuminating device, since the condensing element 21 is united with the cover part 4, there are few parts and manufacture is easy.

FIG. 26 is a cross-sectional view showing a part of a lighting apparatus according to the seventh embodiment of the present invention.
In this embodiment, the cover portion 4 is fixed to the substrate 1 via the positioning member 25, and thereby the condensing element 21 is positioned with respect to the second light source 13.
The positioning member 25 determines the distance of the condensing element 21 with respect to the second light source 13 (distance in the direction V1 perpendicular to the substrate 1), and may be, for example, an annular member made of resin. By appropriately selecting the height dimension of the positioning member 25, the distance of the light collecting element 21 from the second light source 13 can be arbitrarily set.
Other configurations can be the same as those in the sixth embodiment.

FIG. 27 is a cross-sectional view showing a part of a lighting apparatus according to the eighth embodiment of the present invention.
In the illumination device of this embodiment, the optical path changing unit 14 includes a condensing element 21 and a photorefractive element 22. Specifically, the optical path changing unit 14 has a structure in which the photorefractive element 22 is provided on the lower surface side (the side opposite to the second light source 13 side) of the condensing element 21.
As shown in FIGS. 28 and 29, the photorefractive element 22 has one or more prism portions 23 that refract light. In the illustrated example, a plurality of prism portions 23 are formed continuously on the upper surface 22 a of the photorefractive element 22. One surface (inner peripheral surface 23a) (see FIG. 29) of the prism portion 23 is inclined with respect to the direction V1.

The inclination direction of the inner peripheral surface 23a is determined according to the required inclination direction of the second illumination light. For example, the inner peripheral surface 23a of the prism portion 23 of the second illumination unit 3 (3A) located on the left in FIG. 1 is inclined so as to descend to the right as shown in FIGS. Yes. The outer peripheral surface 23b of the prism portion 23 can be a surface along the direction V1.
The lower surface 22b of the photorefractive element 22 is a flat surface along one surface 1a of the substrate 1 and is substantially parallel to the surface 1a (see FIG. 27). For this reason, the photorefractive element 22 is in a posture along the substrate 1.

As shown in FIGS. 27 and 28, the condensing element 21 and the photorefractive element 22 are fitted into the mounting opening 4a formed on the lower plate 4b of the cover 4 and fixed to the peripheral edge of the mounting opening 4a. be able to.
The light L1 emitted from the second light source 13 (see FIGS. 28 and 29) is narrowed in the emission range by the condensing element 21 (light L2), and is an inner peripheral surface that is an inclined surface of the prism portion 23 of the photorefractive element 22. 23a, and exits from the lower surface 22b as light L3 (second illumination light LA).

  In this illuminating device, since the optical path changing unit 14 includes the light refracting element 22, the light is refracted by the light refracting element 22, and second illumination light inclined at a larger angle is obtained. Therefore, the apparatus can be further reduced in thickness and size.

  DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 1a ... One surface of a board | substrate, 2 ... 1st illumination part, 3 ... 2nd illumination part, 4 ... cover part, 11 ... 1st light source, 12 ... light guide, 13 ... second light source, 14 ... light path changing portion, 15 ... opening, 15a ... periphery, 15b ... inner surface, 21 ... light collecting element , 22 ... Photorefractive element, 25 ... Positioning member, 30 ... Touch pad (detection sensor), AX1 ... Optical axis of the condensing element, AX2 ... Optical axis of the second light source, V1 ... A direction perpendicular to the substrate.

Claims (5)

A substrate, a first illumination unit that emits first illumination light, and a second illumination unit that emits second illumination light in a range narrower than the first illumination unit,
The first illumination unit includes a sheet-like light guide along one surface of the substrate, and a first light source that obtains the first illumination light by introducing light into the light guide and propagating the light in the surface direction. Have
The second illuminator includes a second light source mounted on one surface of the substrate, and the second illuminating light toward a direction inclined with respect to a direction perpendicular to the substrate with light from the second light source. And an optical path changing unit
The optical path changing unit has a condensing element that narrows an emission range of the light,
The condensing element is a Fresnel lens, and is provided with an optical axis position shifted in a direction corresponding to the tilt direction with respect to the optical axis of the second light source, and has a posture along the substrate. A lighting device characterized by the above.   The lighting device according to claim 1, wherein the condensing element is movable with respect to the second light source, and an amount of deviation of an optical axis with respect to an optical axis of the second light source can be adjusted by the movement.   The lighting device according to claim 1, wherein the optical path changing unit includes a photorefractive element that refracts the light and directs the light in the tilt direction.   The lighting device according to claim 1, wherein the substrate includes a detection sensor that detects proximity or contact of a detection target.   The cover part which covers the said board | substrate, a 1st illumination part, and a 2nd light source is further provided, The said cover part is integrated with the said condensing element, The any one of Claims 1-4 characterized by the above-mentioned. The lighting device according to item.