JP2008021613A - Illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device in which brightness unevenness at light emission can be suppressed to be low when light from a light source is introduced into a light guide member and the light guide member emits the light. <P>SOLUTION: A pressing operation type on-vehicle switch 4 is installed at a grip support part of a steering wheel. In this switch 4, a contact between a fixed contact and a movable contact is allowed by elastic deformation of an elastic member 10, and these contacts become non-contact accompanied with elastic recovery of the elastic member 10. Positioning pins 18 are installed on the upper face of this elastic member 10, and a light guide 14 for switch illumination is mounted on the elastic member 10 in a positioning state by these positioning pins 18. Reflecting coatings 20 are installed at the outer peripheries of the positioning pins 18, the light introduced into the light guide 14 from an LED 9 is made to be reflected by the reflecting coatings 20, and the light is made to be spread over nearly the whole area of the light guide 14 even if the light guide 14 has an obstacle in light guiding of an insertion hole 15 or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an illumination device that guides light from a light source to a light guide member and irradiates the light.

Conventionally, a center cluster of a vehicle has been provided with a switch group that is operated when operating an air conditioner, a car navigation device, an audio device, and the like. In these in-vehicle switches, an illuminating device is provided on the rear surface of the operation unit to illuminate the periphery of the switch from the rear side when the interior of the vehicle is dark, such as at night, to improve the visibility of the switch position. As this type of lighting device, for example, as shown in Patent Document 1, light from a light source disposed on an end surface of a light guide is scattered or reflected by a fine uneven structure provided on the bottom surface of the light guide. There is a side view type in which the scattered light or reflected light is emitted with the upper surface of the light guide as the light emitting surface.
JP-A-8-194219

  By the way, in this type of vehicle field, space saving of component arrangement positions is required at a high level. Therefore, when this type of lighting device is employed in a vehicle, for example, as shown in FIG. A structure in which a hole 82 is provided in the light plate 81 and a switch 83 is disposed in the hole 82, and light from the light source 84 disposed in the corner of the light guide 81 is irradiated from two sides through the pair of guide portions 85. May be adopted. If this arrangement structure is used, it is possible to place the switch 83 in a space where only the light guide 81 is usually arranged, and it is possible to reduce the size of the lighting device accordingly.

  However, in the illuminating device shown in FIG. 11, since the light guide component is comprised by the light guide 81 and the two guide parts 85, there exists a problem with many components. Further, depending on the positional relationship between the hole 82 provided in the light guide 81 and the light source 84, there is a concern that the amount of light transmitted to the position hidden in the hole 82 when viewed from the light source 84 in the light guide 81 may be reduced. It is also necessary to take into account ensuring that the light spreads to the part. Therefore, there has been a demand for reliably distributing light to the back side portion of the hole 82 while reducing the number of parts of the light guide member and reducing the number of parts.

  An object of the present invention is to provide an illuminating device capable of reducing the number of parts of a light guide member that guides light to a light emitting surface at the time of light emission, and reducing luminance unevenness at the time of light emission.

  In order to solve the above problems, in the present invention, in a lighting device that guides light from a light source with a light guide member and irradiates the light from one surface of the light guide member, the light guide member is attached to a surrounding mounting component. The gist is to provide the light guide member with a locking portion serving as a positioning position when attaching to the light guide member, and to use the positioning locking portion as a light reflecting portion for securing the amount of light necessary for the irradiation.

  According to this configuration, when the light source irradiates light, the irradiation light is introduced into the light guide member, and the light guide member irradiates light from one surface with the irradiation light, and the irradiation device enters the illumination state in which the light is irradiated. . By the way, in this invention, since the latching part for positioning at the time of attaching a light guide member to an attachment component is shared as a light reflection part in a light guide member, the irradiation light introduced into the light guide member is this The optical path is changed so as to be reflected by the locking portion and reach the entire light guide member. Therefore, the light that can produce the light amount necessary for the illumination of the illumination device is distributed to the light guide member, and for example, it is difficult for the illumination device to illuminate in a state including luminance unevenness. Therefore, in the present invention, since the positioning locking portion and the light reflecting portion are shared, even if the light is distributed in the light guide member so as not to cause luminance unevenness during illumination of the lighting device. This can be satisfied without increasing the number of parts.

The gist of the present invention is that a locking projection that locks with the locking portion at the time of mounting is provided on the mounting component, and a reflective material that functions as the light reflecting portion is provided on the locking projection. .
According to this configuration, the light is reflected not only by the positioning locking portion but also by the reflecting material of the locking projection serving as the locking destination of the locking portion, so that the light is reflected in the light guide member. Efficiency increases, and this is highly effective in suppressing luminance unevenness.

The gist of the present invention is that a processing portion for disposing another member is formed on the light guide member, and the locking portion is disposed on the light guide member at a position opposite to the light source with respect to the processing portion. To do.
According to this configuration, when this type of processed portion is formed on the light guide member, when the light from the light source is introduced into the light guide member, the processed portion becomes an obstacle to the light guide, and the light becomes a light source in the processed portion. It becomes difficult to reach the opposite position. However, if the light in the light guide member is reflected by the light reflecting portion so that the light wraps around the light guide member on the side opposite to the light source of the processed portion, the light guide member is opposite to the light source of the processed portion. The amount of light supplied to the side position increases. Therefore, even in the structure in which the processed portion is provided on the light guide member, it is highly effective in suppressing luminance unevenness when the illumination device illuminates.

The gist of the present invention is that a second light reflecting portion for reflecting the light toward the light guide member is provided at an input position of the light emitted from the light source in the light guide member.
According to this configuration, since the light emitted from the light source is reflected by the second light reflecting portion, a large amount of light components that take a course in the direction toward the inside of the light guide member can be taken. Therefore, for example, even if the light source is arranged at the end portion position of the light guide member, if the light of the light source is reflected by the second reflecting portion, the light of the light source can be guided to the inside of the light guide member. Become. For this reason, the degree of freedom of the number of light sources and the arrangement position is increased, and the effect is also high from this viewpoint.

The gist of the present invention is that at least a part of the side surface of the light guide member is provided with a third light reflecting portion that reflects light passing through the light guide member into the light guide member.
According to this configuration, the light introduced into the light guide member is prevented from leaking to the outside from the side surface by the third light reflecting portion provided on the side surface of the light guide member. Therefore, since the light component introduced into the light guide member has less components leaking out from the side surface, it is possible to increase the amount of light components that contribute to illumination, which is effective in ensuring high brightness when the lighting device is illuminated. Is expensive.

The gist of the present invention is that a plurality of the locking protrusions are provided so as to support the light guide member on at least three sides of the light guide member.
According to this configuration, when the light guide member is attached to the attachment component, the light guide member is supported by the locking protrusions on at least three sides thereof. Therefore, since the light guide member is positioned on the attachment component in a state where the light guide member is supported at three points by the locking projection, it is possible to attach the light guide member to the attachment component in a state in which it is difficult to be displaced.

  In the present invention, it is used as an illumination source of the switch component by being arranged on the back side of the design part of the switch component, and is elastically deformed at the time of switch operation and movable contact at the opposite position of the substrate on which the fixed contact of the switch component is provided. The light guide member is positioned between the elastic member and the design portion by disposing the elastic member provided with the locking projection on at least one of the elastic member and the design portion as the mounting part. The gist is to do.

  According to this configuration, since the illumination device of the present invention is used as an illumination source for lighting the switch component from the back, it is possible to provide a switch component that is lit around in a state where luminance unevenness is low, and the switch position is visually recognized. There is an effect such as ensuring safety.

  According to the present invention, when light from a light source is introduced into a light guide member and the light guide member emits light, luminance unevenness at the time of light emission can be suppressed to a low level.

Hereinafter, an embodiment of a lighting device embodying the present invention will be described with reference to FIGS.
As shown in FIG. 4, a steering wheel 1 that is operated when changing the traveling direction of the vehicle is provided in the driver's seat of the vehicle. A switch group 3 is provided on the grip support portion 2 of the steering wheel 1 as an operation location to be operated when operating various devices such as a shift device, a direction indicating device, an in-vehicle air conditioner, a car navigation device, and an in-vehicle audio device. It has been. The switch group 3 is composed of a plurality of on-vehicle switches 4,... Provided for each switch function.

  As shown in FIGS. 1-3, the wall part 2a of the grip support part 2 consists of a resin material which has flexibility, and the several operation part 5 is provided in this wall part 2a for every switch function. As the on-vehicle switches 4,..., Push-type switches are used in which the switch contacts come into contact only while the operation unit 5 is being pushed, and the switch contacts become non-contact when the operation unit 5 is released. The wall portion 2a corresponds to the design portion, and the switch group 3 corresponds to the switch component.

  Each operation unit 5 of the in-vehicle switch 4 is formed with a design unit 6 that represents each switch function and is turned on by irradiation light from the back surface. The design portion 6 uses a transparent resin such as acrylic, styrene, or urethane, while the other portion of the operation portion 5 (substantially the entire area of the grip support portion 2) is made of a colored resin material such as black. It consists of a layered diffusing material, and has the function of diffusing light received by itself in multiple directions and emitting it outside as shown in FIG. Moreover, the design part 6 is integrally formed with the other part in the wall part 2a of the grip support part 2 by a manufacturing method such as two-color molding.

  As shown in FIGS. 1 to 3, a substrate 7 on which various electronic components of the switch group 3 are mounted is provided on the back surface of the operation portion 5 in the wall portion 2 a of the grip support portion 2. A fixed contact 8 of each switch 4 is formed on the substrate 7 by the number of operation portions 5. In addition, an LED (Light Emitting Diode) 9 for irradiating light to each switch 4 (each design portion 6) from the back surface of the wall portion 2a is mounted on the substrate 7. The LED 9 is arranged at a position closer to the outside of the substrate 7 in the direction of irradiating light upward. The LED 9 corresponds to a light source.

  A substantially flat elastic member 10 made of, for example, a rubber material (rubber rubber) is formed above the substrate 7. A protrusion 11 is integrally formed on the upper surface of the elastic member 10 at a position facing the operation portion 5 in the vertical direction. Further, on the back surface of the elastic member 10, a step portion 12 having a height lower than the outer periphery of the elastic member 10 is formed as shown in FIG. 3. In the stepped portion 12, the movable contacts 13 of the in-vehicle switch 4 are formed by the number of the operating portions 5 at positions facing the operating portion 5 (projections 11) in the vertical direction. The elastic member 10 corresponds to a mounting part, and the protrusion 11 corresponds to another member.

  When the operation unit 5 is pushed in each switch 4, the projection 11 located on the back surface of the operation unit 5 moves downward with the elastic deformation of the elastic member 10, and the movable contact located on the back surface of the projection 11. 13 contacts the fixed contact 8, and the in-vehicle switch 4 is turned on. On the other hand, when the hand is released from the operation unit 5 that has been pushed in, the elastic member 10 returns to its original shape by its own elastic force, and the movable contact 13 moves away from the fixed contact 8 along with this shape return, and the in-vehicle switch 4 is turned off. It becomes.

  Between the wall portion 2a of the grip support portion 2 and the elastic member 10, a light guide 14 that guides the light emitted from the LED 9 to the design portion 6 is provided. The light guide 14 is made of a transparent resin such as an acrylic resin, and has a substantially flat plate shape. The light guide 14 is formed in a smaller area than the elastic member 10, and an insertion hole 15 through which the middle protrusion 11 among the five protrusions 11 on the elastic member 10 passes is provided at the center thereof. The light guide 14 corresponds to a light guide member, and the insertion hole 15 corresponds to a processed portion.

  A large number of dot-like concave dots 16 are formed on the bottom surface 14a of the light guide 14 as shown in FIGS. The concave dots 16 are formed with fine dots in units of μm, and are disposed at positions where light is desired to be emitted on the upper surface of the light guide 14. The concave dots 16 have a tapered conical shape that converges from the bottom surface 14a of the light guide 14 toward the top surface 14b. In FIGS. 5A and 5B, the concave dots 16 are deformed larger than the actual size. The light guide 14 reflects the light incident from the LED 9 by the concave dots 16 on the bottom surface 14a (including diffusion, dispersion, refraction, total reflection, etc .; the same applies hereinafter), and causes the light from the LED 9 to emit light by using the top surface 14b as a light emitting surface. .

  As shown in FIG. 6A, a light guide portion 17 that guides light emitted from the LED 9 to the inside of the light guide 14 is formed at a position where the light of the LED 9 enters in the light guide 14. The light guide portion 17 is formed on the side surface (side end portion) 14c of the light guide 14 corresponding to the arrangement position of the LED 9, and the upper surface 14b and the side surface 14c of the light guide 14 are hollowed out to form a spherical surface. It is formed in a lens shape. As shown in FIG. 6A, the light guide unit 17 is directed toward the opposite side surface 14d opposite to the side surface 14c provided with the light guide unit 17 (see FIG. 6A). ) In the + y direction) and diffuses the light in the plane direction of the light guide 14 (the xy plane direction in FIG. 6B) as shown in FIG. Lead inside. The light guide unit 17 corresponds to the second light reflecting unit.

  As shown in FIGS. 1 to 3, a plurality of positioning pins 18 projecting toward the light guide 14 are formed on the upper surface of the elastic member 10. The positioning pin 18 serves as a locking portion when the light guide 14 is positioned and fixed to the elastic member 10 when the light guide 14 is incorporated into the grip support portion 2. The positioning pin 18 has a cylindrical shape and is integrally formed with the elastic member 10, and is disposed at a position opposite to the LED 9 with respect to the middle protrusion 11. The positioning pin 18 corresponds to a locking projection.

  On the other hand, the light guide 14 is formed with a notch 19 on three side surfaces 14d to 14f among the four side surfaces. The notch 19 is a portion where the positioning pin 18 of the elastic member 10 is locked, and the cross section is formed in an arc shape. Since the notch 19 is disposed at a position corresponding to the positioning pin 18, it is disposed at a position opposite to the LED 9 with respect to the insertion hole 15. The light guide 14 is positioned and fixed to the elastic member 10 by being supported by the positioning pins 18 on the three sides of the three side surfaces 14d to 14f. The notch 19 corresponds to a locking part (light reflecting part).

  A reflective coating 20 made of a metal material such as gold is applied around the positioning pin 18. As shown in FIG. 7, the reflective coating 20 functions to reflect light passing through the light guide 14 inward, and the light guide 14 has an insertion hole 15 that obstructs light guide. Even if it exists, it works to spread light over the entire light guide 14. Thus, when the reflective coating 20 is provided on the positioning pin 18, the wraparound rate of the light that wraps around the light guide 14 to the position opposite to the LED 9 of the insertion hole 15 is improved, and the amount of light at that position increases.

  A prism portion 21 as shown in FIG. 1 is formed on the side surfaces 14c to 14f of the light guide 14 over the entire circumference or part of the side surfaces 14c to 14f. The prism portion 21 has a shape in which a large number of polyhedrons (so-called prisms) 22 having a plurality of well-polished planes are formed along the side surfaces 14c to 14f of the light guide 14, and are introduced into the light guide 14 from the LEDs 9. Suppresses light leaking outside. The reflective coating 20 corresponds to a light reflecting portion (reflecting material), and the prism portion 21 corresponds to a third light reflecting portion.

Next, the operation of the illumination device of this example will be described.
For example, when a vehicle width lamp or a traveling light of the vehicle is turned on by the driver, the LED 9 is in a light emitting state and emits light upward. At this time, the light emitted from the LED 9 is irradiated to the end position of the light guide 14. Since the light guide portion 17 capable of reflecting light is formed at the input portion of the light guide 14 in the light guide 14, the light emitted from the LED 9 is directed toward the inside of the light guide 14 by the light guide portion 17 of the light guide 14. Is diffused and reflected. As a result, a component in which the light path direction of the LED 9 is directed toward the side surface 14d of the light guide 14 is generated, and the light emitted from the LED 9 is guided into the light guide 14 in all directions.

  The reflected light introduced into the light guide 14 is reflected upward by coming into contact with the plurality of concave dots 16 on the bottom surface of the light guide 14. At this time, the higher the density distribution of the concave dots 16, the more light is reflected upward. Thus, the light guide 14 is in a state where the light guide 14 emits light on the upper surface 14b by the light guided to the inside of the light guide 14, and the design portions 6,... Of each switch 4,. Become.

  Here, when the light guide 14 emits light, the component that abuts the positioning pin 18 in the light passing through the light guide 14 as shown in FIGS. 7 and 8 is caused by the reflection coating 20 around the positioning pin 18. Reflected toward the inside of the light guide 14. Thereby, in the light guide 14, the sneak ratio of the light that wraps around the position opposite to the LED 9 of the insertion hole 15 is improved, and the light component reaching that position increases.

  By the way, when the LED 9 serving as a light source is disposed at the end position of the light guide 14 and the insertion hole 15 for the switch is formed in the light guide 14, the insertion hole 15 is formed when light is introduced into the light guide 14. The light guide becomes an obstacle to light, and the light component reaching the position on the light guide 14 opposite to the LED 9 of the insertion hole 15 is reduced, and the luminance at that position is lowered. However, if the reflection coating 20 is provided on the positioning pin 18 to improve the light wraparound ratio as in this example, it is possible to spread the light over almost the entire light guide 14, and when the light guide 14 is surface-emitted. Is effective in reducing the luminance unevenness.

  Further, since the prism portion 21 is formed on the entire circumference or part of the side surfaces 14c to 14f of the light guide 14, when the light is guided to the light guide 14, the prism portion 21 causes the light to enter the inside of the light guide 14. Since it functions so as to be reflected, it becomes difficult for light in the light guide 14 to escape from the side surface of the light guide 14. As a result, the amount of light that converges in the light guide 14 increases, and the brightness when the light guide 14 emits light is also improved.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) A positioning pin 18 for positioning and fixing the light guide 14 to the elastic member 10 is provided at a position opposite to the LED 9 in the insertion hole 15 of the light guide 14, and a reflective coating 20 is applied to the outer periphery of the positioning pin 18. Thus, the light introduced into the light guide 14 is reflected in the direction toward the insertion hole 15. Therefore, even if the light guide 14 has a portion that obstructs light guiding, such as the insertion hole 15, the light spreads over almost the entire area of the light guide 14. Can be made difficult to occur.

  Further, even if the reflective coating 20 is not provided on the positioning pin 18, it is possible to reflect the light in the light guide 14 in the inward direction only by the notch 19 provided on the side surface of the light guide 14. Therefore, when the light reflecting structure is viewed from this point of view, the notch portion 19 that locks the positioning pin 18 also serves as the light reflecting portion, so that it is possible to satisfy the luminance unevenness suppression when the light guide 14 emits light. Even if the light in the light guide 14 is reflected and wraps around the back surface of the insertion hole 15, this can be satisfied without increasing the number of parts.

  (2) If the light reflection effect is produced only by the notch 19, when the reflection coating 20 is provided on the positioning pin 18, the light in the light guide 14 is reflected by both the notch 19 and the reflection coating 20. I will let you. Therefore, compared with the case where the light in the light guide 14 is reflected only by the notch 19, the light reflection efficiency can be increased and the luminance unevenness can be further suppressed.

  (3) The light guide part 17 which guides the irradiation light of the LED 9 to the inside of the light guide 14 is formed in the light guide 14 where the light is incident. Therefore, even if the LED 9 is disposed at a position closer to the outside of the light guide 14 and overlaps the light guide 14 in its thickness direction (z-axis direction in FIG. 6A), the light emitted by the LED 9 Can be introduced into the light guide 14. Moreover, if the structure which changes the advancing direction of light by providing the light guide part 17 is used, the number and arrangement position of LED9 can be changed freely, and the effect is high also from this viewpoint.

  (4) Since the prism portion 21 is provided on the entire circumference or part of the side surfaces 14c to 14f of the light guide 14, light leakage from the side surfaces 14c to 14f of the light guide 14 is suppressed by the prism portion 21. Accordingly, the component introduced from the side surfaces 14c to 14f of the light introduced into the light guide 14 is reduced, and the light guide 14 is highly effective in securing the light emission luminance.

  (5) When the light guide 14 is positioned and fixed to the elastic member 10, the light guide 14 is mounted in a state where the three sides of the light guide 14 are supported by a plurality of positioning pins 18 provided on the elastic member 10. Therefore, it is possible to attach the light guide 14 to the elastic member 10 in a state where it is difficult to shift the position of three-point support.

  (6) Since the illumination device of this example is used as an illumination source that illuminates the design unit 6 of the switch group 3 (vehicle-mounted switch 4) from the back, the vehicle-mounted switch 4 that can light the design unit 6 with low luminance unevenness is provided. It can be provided and is effective in ensuring the visibility of the switch position.

  (7) If the light guide 17 is provided in the light guide 14 and a structure in which the light emitted from the LED 9 is applied to the light guide 14 to spread the light to the light guide 14, this type of LED 9 having directivity in the light irradiation direction is provided. Even if it is used, only one LED 9 is required as a light source. Therefore, the number of light sources can be reduced as compared with the case where a light source is prepared for each of the switches 4,... Further, if the total number of LEDs 9 to be used can be reduced, power consumption can be reduced accordingly.

  (8) The concave dots 16 are formed on the bottom surface 14 a of the light guide 14, and the light introduced into the light guide 14 is reflected by the concave dots 16. Accordingly, it is possible to obtain as much light component as possible upward in the light component introduced into the light guide 14, and the light guide 14 can be caused to emit light with as high a luminance as possible.

In addition, this embodiment is not limited to the structure so far, You may change into the following aspects.
The shape of the light guide portion 17 is not necessarily limited to the lens shape, and may be a prism shape having a plurality of prisms (textures) 41 as shown in FIG. 9, or at a predetermined inclination angle as shown in FIG. A slope shape having an inclined slope 42 may be used.

-The arrangement position of the light guide part 17 is not limited to the edge part of the light guide 14, It can change freely according to the position of LED9 which is a light source.
The positioning pin 18 is not necessarily limited to a cylindrical shape, and the shape is not particularly limited as long as the light guide 14 can be positioned and the light in the light guide 14 can be reflected.

-It is not limited to forming the positioning pin 18 in the elastic member 10, For example, you may form the positioning pin 18 in the back surface of the wall part 2a of the grip support part 2. FIG.
The reflective coating 20 does not need to be provided on the entire outer periphery of the positioning pin 18 and may be formed only on a portion where light is desired to be reflected.

In the case where the concave dots 16 are provided on the bottom surface 14a of the light guide 14, the formation ratio can be appropriately changed in each place according to the luminance level of light.
The light guide 14 is not necessarily limited to the shape in which the switch insertion hole 15 is formed at the center, and may be a simple plate shape without the insertion hole 15, for example.

  -A light source is not necessarily limited to LED9, A lamp etc. may be used as other light sources. Further, the arrangement position and the number of the light sources are not limited to the combination of one at the end position of the light guide 14, and these can be changed as appropriate.

  The arrangement position and the number of the positioning pins 18 and the notches 19 are not limited to a combination of one each on the three side surfaces of the light guide 14 (three in total), and can be changed as appropriate.

-A process part is not limited to the insertion hole 15 for inserting the protrusion 11, A groove | channel, a hole, etc. for arrange | positioning various components may be sufficient.
The lighting device of this example is not limited to being used as a backlight for switch parts that illuminate the design portion 6 of the switch group 3 (vehicle-mounted switch 4) from the back, and can be used as an illumination source for various devices and apparatuses. is there.

Next, technical ideas that can be grasped from the above-described embodiment and other examples will be described below together with their effects.
(1) In any one of Claims 1-7, the said light source is arrange | positioned in the position near the outer side in the said light guide member. In this case, when the light source is arranged at a position closer to the outside in the light guide member, the light amount in the light guide member differs for each part, but the light in the light guide member is reflected by the light reflecting portion. For example, it is possible to spread light over almost the entire area of the light guide member by supplementing light to a portion having a small amount of light, which is highly effective in suppressing luminance unevenness.

  (2) In any one of Claims 1-7, the said light source overlaps the said light guide member in the thickness direction (z-axis direction of Fig.6 (a)) in the position near the outer side of the said light guide member. Arranged in a state. In this case, the size in the planar direction of the lighting device can be kept small.

  (3) In any one of Claims 1-7, the 4th light reflection part which reflects the light guide | induced to the inside of the said light guide member toward a light emission surface was provided in the bottom face of the said light guide member. In this case, since a large amount of light components reaching the light emitting surface can be obtained, the light emission luminance can be increased.

The disassembled perspective view of the illuminating device containing the switch mechanism in one Embodiment. The disassembled perspective view of the illuminating device of the state which assembled | attached the light guide to the elastic member. The longitudinal cross-sectional view of the illuminating device containing the switch mechanism. The top view of the steering wheel provided with various switches. (A) is sectional drawing of a light guide, (b) is a top view of a light guide. (A) is the side surface explaining the reflection state of the irradiation light of LED, (b) is a top view at that time. The top view showing the path | route of the light when the light in a light guide reflects with the positioning pin. The side view showing the state in which light reflects with a reflective coating. The longitudinal cross-sectional view of the illuminating device which expanded the light guide part vicinity in another example. The longitudinal cross-sectional view of the illuminating device which expanded the light guide part vicinity in another example. The top view of the conventional light guide.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Wall part as design part, 3 ... Switch group as switch part, 7 ... Board | substrate, 8 ... Fixed contact, 9 ... LED as light source, 10 ... Elastic member as attachment part, 11 ... Protrusion as other member DESCRIPTION OF SYMBOLS 13 ... Movable contact, 14 ... Light guide as a light guide member, 14c-14f ... Side surface, 15 ... Insertion hole as a process part, 17 ... Light guide part as a 2nd light reflection part, 18 ... Locking protrusion Positioning pin as a part, 19 ... Notch part as a locking part (light reflecting part), 20 ... Reflective coating as a light reflecting part (reflecting material), 21 ... Prism part as a third light reflecting part.

Claims (7)

In an illumination device that guides light from a light source with a light guide member and irradiates the light from one surface of the light guide member,
The light guide member is provided with a locking portion serving as a positioning position when the light guide member is attached to a surrounding mounting component, and the locking portion for positioning the light reflection for securing the light amount necessary for the irradiation. A lighting device characterized by being used as a part.   The locking projection that locks with the locking portion at the time of the mounting is provided on the mounting component, and a reflective material that functions as the light reflecting portion is provided on the locking projection. The lighting device described.   The processing portion for arranging another member is formed on the light guide member, and the locking portion is arranged at a position opposite to the light source with respect to the processing portion in the light guide member. Or the illuminating device of 2.   The second light reflecting portion for reflecting the light toward the inside of the light guide member is provided at an input position of the light emitted from the light source in the light guide member. The illuminating device as described in any one of these.   5. The third light reflecting portion is provided on at least a part of the side surface of the light guide member to reflect light passing through the inside of the light guide member into the light guide member. The illuminating device as described in any one of these.   The lighting device according to any one of claims 2 to 5, wherein a plurality of the locking protrusions are provided so as to support the light guide member on at least three sides of the light guide member.   By placing it on the back of the design part of the switch part, it is used as an illumination source of the switch part, and at the opposite position of the board on which the fixed contact of the switch part is provided, elastically deformed at the time of switch operation and provided with a movable contact An elastic member is disposed, and the light guide member is positioned between the elastic member and the design portion by providing the locking protrusion on at least one of the elastic member and the design portion as the attachment part. The lighting device according to any one of claims 2 to 6.

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