JP2010177196A - Illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device in which surface-like light emission of a surface-like light transmission part can be carried out without using a light guide plate even if in the case a directive light source is arranged at the end part of a pair of surface-like light transmission part to use this as the light source. <P>SOLUTION: On both ends of interior of flat face-shaped lens 13 which is at a pair of light exit of an illumination fixture 2, LEDs 17 as an illumination light source are vertically arranged. On the rear face of the lens 13, a light diffusion film 22 capable of having both light diffusion function and reflection function in combination is mounted. Moreover, a pair of light diffusion films 22 are mounted at the opposing position in parallel in a state of having a spacing. Irradiating light of the LEDs 17 is guided in an irradiation direction while being mutually reflected-back between the pair of light diffusion films, and by diffusion effect of the light diffusion film 22, diffused in the orthogonal direction to the irradiation direction of light, and surface emission from the lens 13 is carried out. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illuminating device that has a directional light source having directional light as an illumination light source, guides the light emitted from the light source to a planar light transmitting portion, and performs illumination by surface light emission from a light emitting surface.

  Conventionally, as an illuminating device using a light emitting diode (LED) as a light source, for example, a light emitting surface (planar light transmitting portion) of the illuminating device is used as a cover, and a plurality of LEDs are arranged horizontally with respect to the light emitting surface. The mainstream is a structure in which light is emitted from the light emitting surface by arranging the LEDs side by side in the direction and deriving the light (light emitting portion) of these LEDs from the light emitting surface that is the exit of the light. However, when the illumination device is observed from the outside when the LED is in the lighting state, each LED has a direction in which the base axis (irradiation axis) of the light irradiation direction is derived from the light emitting surface to the outside. Since they are arranged in almost the same direction (that is, in a direction orthogonal to the light emitting surface), the light emitting portion of the LED appears as light grains (bright spots). There was a problem that it looked bad.

  Usually, as a measure to make the irradiation light from the light emitting surface uniform, for example, a lens made of milky white resin or frosted glass is used, or a lens cut is formed on the lens to diffuse the light from the light source. Work is required to make it happen. However, in a light source having directivity such as an LED, since the directivity of light is strong, it is difficult to make the light emitting surface uniformly (surface light emission) even if these countermeasures are used. In addition, in order to maintain a uniform brightness of light above a certain level, a plurality of LEDs must be used. In this case, the more light emission area, the more LEDs are required. Therefore, it leads to the problem that the component cost required for LED increases.

  As an effective measure for solving this problem, for example, as shown in FIG. 11, an illumination device 83 (for example, Patent Document 1) using an edge light system in which an LED 81 (high luminance light emitting diode) and a light guide plate 82 are combined. See). In this illuminating device 83, a light guide plate 82 made of a highly transparent resin plate processed by blast molding or the like so as to have a light guide effect is used, and LEDs 81 are arranged on the edge portion (edge portion) of the light guide plate 82. The light of the LED 81 is incident on the edge portion. Then, the light of the LED 81 is diffused by the light guide plate 82, and this light is output as irradiation light that appears uniformly from the light emitting surface of the light emitting unit 84.

Japanese Patent Laid-Open No. 2002-229022

  By the way, since this kind of light guide plate 82 requires fine processing, printing, or the like on the resin, there is a current situation that the cost of parts is generally high. Therefore, when using such a light guide plate 82 to equalize the irradiation light of the lighting device 83, the number of LEDs 81 can be reduced, but this time the cost for preparing the light guide plate 82 is reversed. After all, there was a situation that does not lead to keeping the device cost of the lighting device 83 low. In addition, since this type of light guide plate 82 has a disadvantage that it is heavy, using the light guide plate 82 as a component for uniforming the luminance of illumination leads to a problem that the weight of the lighting device 83 becomes heavy.

  An object of the present invention is to allow surface emission of a light emitting surface without using a light guide plate even when a directional light source is arranged at an end portion of the light emitting surface and an illumination structure using this as a light source is taken. The object is to provide a lighting device.

  In order to solve the above problems, in the invention according to claim 1, the device case has a pair of planar light transmission portions as light outlets on both surfaces of the device case, and the end portions of the planar light transmission portions inside the device case. In addition, a directional light source having directional light is disposed, and the irradiation light emitted from the directional light source toward the other end of the planar light transmitting portion is transmitted from the planar light transmitting portion. In the illuminating device to be derived, a pair of translucent light adjusting members are arranged in parallel on the back surfaces of the pair of planar light transmitting portions, and the directional light source includes a plurality of light source bodies, and the planar shape Each of the light source bodies of the directional light source disposed on one side at each end of the light transmitting portion, and each of the light source bodies of the directional light source disposed on the other side facing them, Alternately in the direction orthogonal to the irradiation axis direction of the directional light source And the directional light source is disposed in a space between the pair of light adjustment members so that an irradiation axis thereof is parallel to the pair of light adjustment members, and the pair of light adjustment members A plurality of grooves extending in parallel are formed on the side of the pair of planar light transmission parts, and the opposing sides of the pair of light adjustment members are formed flat, and the pair of light adjustment members The groove direction of the groove and the irradiation axis direction of the directional light source are attached to the apparatus case so that the direction of the directional light source is the same direction, and the pair of light adjustment members are incident on the light adjustment member by the directional light source. It has a diffusion effect that diffuses light in the direction perpendicular to the irradiation axis of the directional light source by the plurality of grooves, and a reflection effect that turns back to the incident side, and the mutual reflection effect that the pair of light adjustment members have By the irradiation light, the planar shape Guiding effect of guiding to the other end of the transmission portion, and the combined effect of the diffusion effect, the gist to carry out illumination by means of a double-sided emission illuminate the pair of planar light transmitting portion over the entire surface.

  Here, the “irradiation axis of the light source” refers to the central axis of the light distribution (light flux) distribution from the light source. On this irradiation axis, the amount of light flux per unit area is approximately the maximum at a position equidistant from the light source. It has the property which becomes. The central axis does not necessarily mean a structural (geometric) symmetry axis in, for example, a light bulb or a bullet-type LED.

  According to this configuration, the illumination light source is arranged at the ends of the pair of planar light transmission parts so that the directional light source is reflected on the planar light transmission part (light emitting surface) and the appearance does not deteriorate. When the directional light source emits light, a part of the irradiation light is diffused in an orthogonal direction perpendicular to the irradiation axis of the directional light source due to the diffusion effect of the light adjusting member, and a pair of planar light transmissions is performed. Radiated from the outside. In addition, due to the light guide effect caused by arranging a pair of light adjusting members having a reflection effect facing each other, the irradiation light passed between the two is guided in the irradiation direction (irradiation axis direction), Most of the reflected light from the directional light source reaches the end on the opposite side of the case. For this reason, since the light of the directional light source spreads widely to the planar light transmission part (light emitting surface), for example, double-sided light emission that causes a pair of planar light transmission parts to emit light without using an expensive light guide plate Is possible.

  Furthermore, in the present invention, since the surface emitting light sources are arranged at both ends of the light emitting unit, both sides of the light emitting unit can be illuminated brightly. For this reason, for example, it is possible to make it difficult to take an illumination state in which only one side is bright and the other side is dark in the light emission direction of the light source.

  In addition, in the present invention, between the plurality of light source bodies arranged on one side at both ends of the planar light transmission part is illuminated by the light of the light source body arranged at a position facing these. For this reason, since light is supplemented by the opposing light sources between the adjacent light source bodies arranged on one side of both ends of the planar light transmitting portion, it is possible to further achieve uniform surface emission. .

  In addition, due to the light refraction and reflection action at the groove interface, the light incident on the light adjusting member is diffused in an orthogonal direction perpendicular to the light irradiation direction (irradiation axis direction). The irradiation light of the light source spreads in this orthogonal direction. In particular, when the grooves are regularly arranged so as to extend in parallel with the adjacent ones at an equal interval, the light is reflected regularly and guided to the other end by the light guide effect. It can reach far along the groove direction of the adjusting member. For this reason, since the light of the directional light source spreads in both the irradiation direction and the orthogonal direction, the light emitting surface can be illuminated more uniformly.

The invention according to claim 2 is summarized in that, in the illumination device according to claim 1, the pair of light adjusting members is a sheet material having a sheet shape.
According to this configuration, since the thickness of the light adjustment member can be reduced, the thickness size of the lighting device can be reduced.

  According to a third aspect of the present invention, in the illumination device according to the first or second aspect, the plurality of parallel grooves formed in the pair of light adjusting members are formed at equal distances from each other. It is a summary.

  In the invention which concerns on Claim 4, in the illuminating device as described in any one of Claims 1-3, the depth width of the groove | channel formed in the said pair of light adjustment member becomes small continuously toward the back. The gist is that the hole has a triangular shape in cross section and a groove angle between 60 degrees and 120 degrees is provided.

  In the invention which concerns on Claim 5, in the illuminating device as described in any one of Claims 1-4, as for a pair of said light adjustment member, while the surface side is formed with an acrylic resin, a back surface side is from a polyester film layer. The gist is that it has a double structure.

The invention according to claim 6 is summarized in that, in the illumination device according to any one of claims 1 to 5, the directional light source is configured by an LED.
In the invention which concerns on Claim 7, in the illuminating device as described in any one of Claims 1-6, the irradiation light of the said directional light source is surfaced from the said pair of planar light transmission part by the said pair of light adjustment member. The gist is to provide a plurality of functional units that emit light.

  According to this configuration, it can be applied as an illumination light source to a lighting device having a large light emitting area.

  According to the present invention, even when a directional light source is disposed at an end of a light emitting unit and an illumination structure using the directional light source as a light source is used, surface light can be emitted from the light emitting surface without using a light guide plate. .

The perspective view which shows the external appearance in the vehicle in which the illuminating device in one Embodiment was installed. The disassembled perspective view which shows the specific structure of an illuminating device. The perspective view which shows the external appearance of an illuminating device. The longitudinal cross-sectional view which shows the internal structure of an illuminating device. The schematic diagram which shows the arrangement position of LED which is a light source of an illuminating device. The top view which shows the external appearance of a light-diffusion film, and its partial enlarged view. The expansion perspective view which shows the surface shape of a light-diffusion film. It is explanatory drawing which shows the state which light diffuses and refracts in a light-diffusion film, (a) when an incident angle is smaller than a critical angle, (b) when an incident angle is larger than a critical angle, (c) is Explanatory drawing in case incidence takes the substantially same value as a critical angle. The longitudinal cross-sectional view which shows an example of the illuminating device in another example. The block diagram which shows an example of the illuminating device in another example. The longitudinal cross-sectional view which shows the structural example of the conventional illuminating device.

Hereinafter, an embodiment of a lighting device embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, an illumination lamp 2 is provided on the interior ceiling of the vehicle 1 as an instrument for illuminating the interior of the vehicle. The illumination lamp 2 is provided with a slide type operation switch 3 that is operated when the operation mode of the illumination lamp 2 is switched. The operation switch 3 can be operated in three positions: a door lighting position, an on position, and an off position. When the operation switch 3 is operated to the door lighting position, the illumination lamp 2 is turned on when the vehicle door 4 is opened. When the operation switch 3 is operated to the on position, the illumination lamp 2 is always turned on, and when the operation switch 3 is operated to the off position, the illumination lamp 2 is always turned off. The illumination lamp 2 corresponds to an illumination device.

  As shown in FIG. 2, the illumination lamp 2 is provided with a base member 6 having a rectangular plate shape as a base material portion of the main body case 5 of the illumination lamp 2. On the upper surface 6 a side of the base member 6, a cover 7 is attached and fixed as, for example, a screw 8 as an upper lid for closing the base member 6 from above. A screw mounting portion 9, which is a mounting destination of the screw 8 in the cover 7, is provided in a stepped portion 10 of the cover 7, and a screw that is screwed to the screw mounting portion 9 by mounting a screw lid 11 on the stepped portion 10. Designability is ensured so that 8 is not exposed to the outside. The main body case 5 corresponds to a device case. The outer surface side of the cover 7 corresponds to the surface of the device case, the outer surface side of the base member 6 corresponds to the back surface of the device case, and the upper surface 6a of the base member 6 corresponds to the inner surface of the bottom surface of the device case.

  As shown in FIGS. 2 and 3, the cover 7 has an opening by punching out the upper wall of the cover, which is the outer wall of the main body case 5, in a long rectangular shape from the center to the end on the side opposite to the screw. 12 is formed. A planar (plate-shaped) lens 13 is attached to the opening 12 as a light outlet of the illumination lamp 2. The illuminating lamp 2 of this example illuminates the surroundings by surface emission that irradiates light from the entire surface of the lens 13. The lens 13 has a diamond-cut shape, and assists in uniform surface emission so that the entire surface of the light emitting surface shines. The lens 13 is assembled to the cover 7 by locking a plurality of hooking portions 14 formed on the edge of the lens 13 to corresponding hooking holes 15 formed on the peripheral edge of the opening 12. Moreover, the illumination lamp 2 of this example is a single-sided light emitting type that emits light only from the cover 7 side. The lens 13 corresponds to a planar light transmission part.

  As shown in FIGS. 2, 4, and 5, a pair of light source units 16 are attached to both ends of the base member 6 in the width direction (X-axis direction in FIG. 2) of the illumination lamp 2 so as to face each other. Yes. These light source units 16 have a plurality of LEDs 17, 17... Arranged at regular intervals along the longitudinal direction of the illumination lamp 2 (Y-axis direction in FIG. 2), and a long and thin plate shape on which these LEDs 17, 17. LED substrate 18. The reason why the LED 17 is used as the light source of the illuminating lamp 2 is that the LED 17 has an advantage that it has a long life, and therefore, it is possible to save time and labor for replacing the light source. In addition, a pair of substrate terminals 19 and 19 (only one side is shown) for electrical connection of the LED 17 are provided at the end of the LED substrate 18 (front end in FIG. 2). The light source unit 16 corresponds to a directional light source, and the LEDs 17 correspond to a plurality of light source bodies in the directional light source.

  These light source units 16 and 16 are attached to the standing pieces 20 and 20 formed by bending at both ends in the width direction of the base member 6 in a vertical direction (vertical direction), for example, with an adhesive tape or the like. For this reason, the LED 17 emits light in a direction parallel to the light emitting surface of the lens 13 (hereinafter referred to as the light emitting direction Kc shown in FIG. 5). That is, the irradiation axis of the LED 17 is in a positional relationship perpendicular to the light emitting surface of the lens 13. The light emission direction Kc includes taking the irradiation axis of the LED 17 and also taking the direction perpendicular to the longitudinal direction of the illumination lamp 2. Moreover, the illumination structure of the illumination lamp 2 of this example guides the light of LED17 irradiated from the width direction edge part to the height direction (Z-axis direction of FIG. 2) of the illumination lamp 2, and uses it as illumination light from the lens 13. It is a method of drawing out. Further, the reason why the LED 17 takes the above-described arrangement position is to improve the appearance of lighting without the LED 17 itself being reflected in the lens 13. Furthermore, as shown in FIG. 5, the LED 17 is located on one side in the width direction of the illumination lamp 2 (X-axis direction in FIG. 2), and the LED 17 is located on the other side in the same width direction. They are staggered in the orthogonal direction Kh perpendicular to the light emission direction Kc.

  Further, on the upper surface of the base member 6 (inner surface when viewed in the case of the illumination lamp 2), a thin plate-like reflecting plate 21 having a light reflecting action on the surface is attached and fixed by, for example, an adhesive tape. The reflection plate 21 is disposed between the pair of light source units 16 facing each other with a predetermined distance from the lens 13 in the height direction of the illumination lamp 2. The reflecting plate 21 functions to reflect the irradiation light from the LED 17 toward the lens 13 and is made of, for example, PET (Polyethylene terephthalate). The reflecting plate 21 corresponds to a reflecting member.

  As shown in FIGS. 2, 4, 6, and 7, a light diffusion film 22 having a function of collecting and irradiating input light is attached to the back surface of the lens 13. The light diffusion film 22 is also called, for example, a prism sheet, and is formed of a thin resin sheet (resin film). More specifically, the front side (lens 13 side) is formed of an acrylic resin, and the back side (reflector 21 side) has a double structure composed of a polyester film layer. The light diffusing film 22 of the present example hooks a plurality of locking tongues 23 formed on its peripheral edge as shown in FIG. 2 with a predetermined interval (gap) between the reflecting plate 21 and the light diffusing film 22. The hole 15 is attached to the cover 7 by being inserted into a notch 24 at the periphery of the opening that continuously connects the holes 15. The light diffusion film 22 corresponds to a light adjusting member.

  As shown in FIGS. 6 to 8, thin grooves 25, 25... Extending along the film width direction (X-axis direction in FIG. 7) along the film width direction are formed on the surface of the light diffusion film 22. A plurality of elements are formed in an arrangement state arranged at equal intervals along the vertical direction (Y-axis direction in FIG. 7). These grooves 25,... Have a triangular cross-sectional shape whose depth width decreases continuously toward the back, and have a predetermined groove angle θ (for example, an angle between 60 degrees and 120 degrees). ing. Further, a plurality of ridges 26 having a triangular cross section formed by cutting the grooves 25 are formed between adjacent grooves. That is, the surface of the light diffusion film 22 has a shape in which grooves 25 and peaks 26 having a triangular cross section are alternately formed along the film length direction.

  Further, as shown in FIG. 6, the light diffusion film 22 covers a direction in which the extending direction of the groove 25 cut in itself (the groove direction Mc in the figure) is parallel to the light emission direction Kc of the LED 17. 7 is attached. Further, as shown in FIG. 4, a spatial region is formed between the reflecting plate 21 and the light diffusion film 22 by arranging them at a predetermined interval, and this spatial region passes light through which the irradiation light of the LED 17 passes. Region 27 is formed.

  Further, as shown in FIG. 2, a substrate 28 on which various electrical components of the illumination lamp 2 are mounted is fixedly attached to the inner surface of the base member 6 via a tape member 29. A switch circuit 30 is mounted on the substrate 28 to detect where the operation switch 3 has been operated. When the contact of the switch circuit 30 is switched according to the switch operation of the operation switch 3, the operation mode of the illumination lamp 2 enters any one of the three states of the door lighting state, the on state, and the off state.

  In addition, an internal wiring connection circuit 31 is mounted on the substrate 28 as a connection location on the substrate 28 for internal wiring (not shown) that connects the pair of light source units 16, 16 and the substrate 28. In addition, an external wiring connection circuit 32 is mounted on the substrate 28 as a connection location on the substrate 28 for external wiring (not shown) drawn from the inside of the illumination lamp 2 to the outside. Furthermore, a wiring through hole 33 is provided in the bottom wall of the base member 6 as a lead hole for external wiring. A bushing 34 for attaching and fixing an external wiring can be attached to the wiring through hole 33.

  Now, in this kind of light diffusion film 22, the incident light entering from its back surface (lower surface 22a: see FIG. 7) depends on the incident angle at that time, and the light on the boundary surface of the film 22 (boundary surface 35 in FIG. 8). There is a property that the diffusion component (refracted light) and the reflection component (reflected light) change. Here, when light enters from a medium with a high refractive index into a small medium, the incident light does not transmit through the boundary surface and is totally reflected is called total reflection. The incident angle (the angle formed with respect to the perpendicular to the boundary surface). ) If the angle exceeds a certain angle, total reflection occurs. This angle is known as the critical angle θx. When light travels from the light diffusion film 22 to the outer surface (in the air) side, it corresponds to the case where light enters from a medium having a large refractive index (light diffusion film 22) to a small medium (air). It may happen.

  As shown in FIG. 8A, the incident light applied to the boundary surface 35 has an incident angle α (θx smaller than the critical angle θx) when the angle formed with respect to the perpendicular La of the boundary surface 35 is an incident angle. > Α), a part of the incident light is refracted from the boundary surface 35 of the groove 25 and escapes upward with a refraction angle α1 (light diffusion effect), and a part of the incident light is incident on the boundary surface 35 at the same incidence. While being reflected at the angle α, the reflected light is reflected by the opposite boundary surface 36 that is the irradiation destination.

  Further, as shown in FIG. 8B, when the incident light with respect to the boundary surface 35 has an incident angle β (θx <β) larger than the critical angle θx, all the incident angles are the same at the boundary surface 35 of the groove 25. While being reflected by β, this reflected light is applied to the opposite boundary surface 36 that is the irradiation destination. If this reflected light reaches the boundary surface 36 at an incident angle β1 smaller than the critical angle θx, for example, a part of this reflected light is refracted from the boundary surface 36 of the groove 25 and the refraction angle β2 is on the upper side. And part of the reflected light is further reflected at the boundary surface 36 at the same β1 angle and reflected toward the inside of the film 22 (light reflection effect).

  Therefore, a part of the incident light incident from the back surface 22a of the light diffusing film 22 appears to spread in the film length direction on the front side of the light diffusing film 22 due to light exiting from the film surface due to the diffusion effect of this light. For this reason, in this example, as shown in FIG. 6, when attaching the light diffusion film 22 to the cover 7, the light emission direction Kc of the LED 17 and the groove direction Mc of the light diffusion film 22 are parallel to each other. One irradiation light of the LED 17 is projected as two illumination lights (see FIG. 7) by the light diffusion film 22. As a result, the number of light visible to the human eye increases on the surface side of the light diffusing film 22, so that the light emitting surface of the lens 13 can be extended in the longitudinal direction (Y-axis direction in FIGS. 3 and 7). It becomes.

  On the other hand, as shown in FIG. 8C, when the incident light with respect to the boundary surface 35 has an incident angle γ (θx ≦ γ <β) that is the same as or slightly larger than the critical angle θx, the boundary surface 35 of the groove 25. In FIG. 2, the light is totally reflected at the same incident angle γ and further totally reflected at the boundary surface 36, so that all components of incident light escape to the back side of the film 22 (light reflection effect). Therefore, in the light diffusing film 22 of this example, when the incident angle of light is slightly larger than the critical angle θx, there is no transmitted light and all the light is totally reflected, so that the reflection efficiency is very high. It can be said.

  In this example, the grooves 25, 25... Of the light diffusing film 22 are regularly cut straight along the film width direction, and as shown in FIG. 4, the reflector 21 and the light diffusing film 22 are parallel (horizontal) so as to face each other. The light passage region 27 is made by repeating the reflection between the light reflected by the light diffusion film 22 with a high reflectance. For this reason, in this example, the light (light guiding effect) for guiding the irradiation light of the LED 17 far is obtained by reflecting the irradiation light of the LEDs 17, 17... Therefore, the light from the LED 17 can be spread in the width direction of the illumination lamp 2 (X-axis direction in FIGS. 3 and 7), and the opposite side of the LED 17 can be brightly lit.

  Therefore, in this example, the light diffusing film 22 in which a plurality of fine grooves 25, 25... Are regularly arranged is used, and the light diffusion effect and the light guiding effect of the light diffusing film 22 are utilized to make the light of the LED 17 light. Is spread in the longitudinal direction and the width direction of the illumination lamp 2 to cause the lens 13 to emit light. For this reason, it becomes possible to light-emit the light of LED17 which takes the arrangement state along an edge light system, without using an expensive light-guide plate. Further, in this example, since the LEDs 17 are alternately arranged on the left and right, the gap between the LEDs 17 and 17 on the same arrangement side can be filled with the light of the LED 17 on the opposite side. Therefore, the light emission balance on the lens 13 is improved, and it is possible to cause the lens 13 to emit light with high uniformity.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) In the illuminating lamp 2 having the illumination structure of the type in which the LEDs 17 are arranged vertically and arranged at the end of the main body case 5, the light diffusion film 22 is attached to the back surface of the lens 13, and the groove 25 that the light diffusion film 22 has. The light of the LED 17 is guided to the plane of the lens 13 by the light diffusing effect in the orthogonal direction of the light and the light guiding effect that reflects the light passing through the region 27 between the light diffusing film 22 and the reflecting plate 21 and guides them away. Spread in the direction (X direction and Y direction). For this reason, since it becomes possible to spread the light of the LED 17 having directivity in a planar shape, the lens 13 can be surface-emitted using this light source.

  (2) Since the LEDs 17 that are the light sources of the illumination lamp 2 are arranged on both sides in the width direction of the main body case 5, both sides in the width direction of the illumination lamp 2 can be illuminated brightly. For this reason, for example, in the width direction of the illumination lamp 2, it is possible to make it difficult to take an illumination state in which only one side is bright and the other side is dark.

  (3) The LEDs 17 located on one side in the width direction of the illumination lamp 2 and the LEDs 17 located on the other side are alternately arranged in an orthogonal direction Kh perpendicular to the light emission direction Kc of the LED 17. . For this reason, the clearance gap between the LED17 located in the same side in the width direction of the illumination lamp 2 is illuminated by the light of LED17 which opposes. For this reason, since the illumination of this gap is supplemented, the effect of making the surface emission of the lens 13 uniform is enhanced.

  (4) A light diffusion film 22 in which grooves 25 and 25 are cut on the surface of the resin film is used as a component for causing the lens 13 to emit surface light from the LED 17. For this reason, this type of component that only needs to have a characteristic on the surface shape of the film enables surface emission of the lens 13 without using a light guide member. There is no.

  (5) Since the sheet-shaped light diffusion film 22 having a thin thickness is used as a component for causing the lens 13 to emit light emitted from the LED 17, the thickness of the illumination lamp 2 can be reduced.

  (6) The lamp type of the illumination lamp 2 is a one-side illumination type in which light is illuminated only from one side (upper surface) of the main body case 5. For this reason, since it is sufficient to provide a light transmission function only on one side of the illumination lamp 2, the structure of the illumination lamp 2 can be simplified.

Note that the embodiment is not limited to the configuration described so far, and may be modified as follows.
When the light diffusing film 22 made of a sheet material is used as the light adjusting member, this is not necessarily limited to the prism sheet, and for example, a light diffusing sheet or a light collecting sheet may be adopted. The light adjusting member is not necessarily limited to this type of resin sheet material, and for example, a resin plate or glass may be used.

  The light adjusting member is not necessarily limited to one having a plurality of regularly arranged grooves 25 and 25 on the surface, and the shape and material are not particularly limited as long as the light adjusting member has a light diffusion function and a reflection function.

  The light diffusion film 22 is not limited to one having a double structure in which the front side is an acrylic resin and the back side is a polyester film layer, and may be a single layer material. Moreover, when taking a double structure, these materials are not limited to an acryl and a polyester film, You may use materials other than these.

  -The illumination lamp 2 is not necessarily limited to a single-sided light emission type. For example, as shown in FIG. 9, for example, by replacing the reflecting plate 21 with a light adjustment member (that is, the light diffusion film 22) and making a part of the base member 6 a light-transmissive member such as a lens, It is good also as a double-sided light emission type from which light is drawn out from both the upper surface and lower surface of the main body case 5.

  The illuminating lamp 2 may be provided with a plurality of functional units that cause the light emitted from the LEDs 17 to emit light with a light diffusion film 22 and a reflector 21 as shown in FIG. 10, for example. In this case, even if the illumination lamp 2 is enlarged, this can be dealt with. In this example, the light diffusing film 22 and the reflecting plate 21 are not individually provided as shown in FIG. 10 between the LED 17 groups forming a group, but one light diffusing film is formed by a set of a plurality of LEDs 17. 22 and the reflector 21 may be shared. Further, although FIG. 10 shows a single-sided light emission type, it may be a double-sided light emission type or a combination of both.

The LEDs 17 are not limited to being disposed on both sides of the main body case 5 in the width direction, and may be disposed only on one side.
The LEDs 17 are not limited to being alternately arranged on the left and right in the width direction of the main body case 5, and may be arranged in the same position.

The directional light source is not necessarily limited to the one having a plurality of LEDs 17, and may be composed of a single LED 17 when high luminance can be obtained with one.
The directional light source is not necessarily limited to the plurality of LEDs 17 arranged, and any kind of directional light source may be used as long as the light emitted from the light source has directivity. For example, one LED may be used, or the line type light source may be an aperture type cold cathode tube.

The lens 13 is not necessarily limited to one having a flat surface, and may have a curved surface with a slightly rounded surface.
The reflecting member is not necessarily limited to the plate-shaped reflecting plate 21 and the shape thereof is not particularly limited as long as it can reflect light. Further, the material of the reflecting member is not limited to resin, and any material may be adopted as long as it has a light reflecting action.

  The illumination lamp 2 is not necessarily used for the interior lamp of the vehicle 1 but can be applied to various lamps.

  DESCRIPTION OF SYMBOLS 2 ... Illuminating lamp as an illuminating device, 5 ... Main body case as an apparatus case, 13 ... Lens as a planar light transmission part, 16 ... Light source unit as a directional light source, 17 ... As several light source bodies in a directional light source 21 ... Reflector plate as reflecting member, 22 ... Light diffusion film as light adjusting member, 26 ... Groove, Kc ... Light emitting direction, Kh ... Orthogonal direction, Mc ... Groove direction.

Claims (7)

Has a pair of planar light transmission parts as light outlets on both sides of the device case,
A directional light source in which the irradiation light has directivity is arranged at the end of the planar light transmitting portion inside the device case,
In the illuminating device for deriving the irradiation light irradiated from the directional light source toward the other end of the planar light transmitting portion from the planar light transmitting portion,
A pair of translucent light adjustment members are arranged in parallel on the back surfaces of the pair of planar light transmission parts,
The directional light source is composed of a plurality of light source bodies,
Each light source body of the directional light source disposed on one side at each end of the planar light transmitting portion, and each light source body of the directional light source disposed on the other side opposite to the light source body. And are alternately arranged in a direction orthogonal to the irradiation axis direction of the directional light source,
And in the space between the pair of light adjustment members, the directional light source is arranged so that its irradiation axis is parallel to the pair of light adjustment members,
A plurality of grooves extending in parallel are formed on the pair of planar light transmitting portions side of the pair of light adjusting members, and opposite sides of the pair of light adjusting members are formed flat, and the pair of light An adjusting member is attached to the device case in a direction in which the groove direction of the groove and the irradiation axis direction of the directional light source are in the same direction, and the pair of light adjusting members are adjusted by the directional light source. A diffusion effect of diffusing the incident light incident on the member in a direction perpendicular to the irradiation axis of the directional light source by the plurality of grooves, and a reflection effect of folding back to the incident side;
A light guide effect that guides the irradiation light to the other end of the planar light transmission part by the mutual reflection effect of the pair of light adjusting members,
And the illumination apparatus characterized by performing illumination by the double-sided light emission which makes the said pair of planar light transmission part shine over the whole surface by the compound effect of the said diffusion effect.   The lighting device according to claim 1, wherein the pair of light adjusting members is a sheet-like sheet material.   The lighting device according to claim 1 or 2, wherein the plurality of grooves extending in parallel formed in the pair of light adjusting members are formed at equal distances from each other.   The grooves formed in the pair of light adjusting members have a hole shape with a triangular cross section whose depth width decreases continuously toward the back, and a groove angle between 60 degrees and 120 degrees is given. The illumination device according to any one of claims 1 to 3.   5. The pair of light adjusting members has a double structure in which a front surface side is formed of an acrylic resin and a back surface side is formed of a polyester film layer. 6. Lighting equipment.   The lighting apparatus according to claim 1, wherein the directional light source includes an LED.   7. The apparatus according to claim 1, further comprising: a plurality of functional units that cause the pair of light adjusting members to emit surface light from the pair of planar light transmission portions by using the pair of light adjusting members. Lighting equipment.

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