JP2014127332A - Linear illuminator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear illuminator which uses a long-size a light guide body capable of expressing the spacial spreading along the longitudinal direction by improving an illumination difference due to the boundaries at both end parts of a linear illumination pattern.SOLUTION: A linear illuminator includes a long-size light guide body, a case for housing the light guide body and a light source disposed at the end part in the longitudinal direction of the light guide body. Therein, a light-shielding wall having a curved shape concaved toward the light source side, with which an emission surface of the light guide body is covered, is provided at the end part of the light source side in the opening of the case, and a light-shielding wall with which an emission surface is covered and a light shape processed wall having a curved shape to be concaved toward such a direction that the wall surface is separated from the light source are provided at the other end part of the part opposite to the light source in the opening of the case.

Description

  The present invention relates to a linear illumination device using a long light guide mainly using an LED as a light source.

  At present, there are increasing opportunities to adopt LEDs for automobile lighting. Since the LED is a point light source with high directivity, it can be used as a light source for vehicle interior illumination or vehicle interior illumination by changing the illumination mode (illumination pattern) using a lens or a light guide. Among these, lighting for which a light source and an object to be illuminated (illuminated object) are set close to each other, for example, lighting inside a storage such as a glove box or cup holder, indoor foot lighting, or an operation unit such as a switch shown in FIG. For lighting, atmosphere lighting for the purpose of decoration / decoration such as instrument panel and trim, and various illuminations, the amount of light is not so required depending on the application. For this reason, by converting the light of the LED which emits point-like light into a linear shape by the light guide, it is possible to realize an illumination mode different from the conventional one and enhance the design. As a linear illumination device using such a linear light guide, for example, Patent Documents 1 to 5 are known.

Patent 4737241 Patent 4463246 JP 2009-269492 A JP2011-240811A

  When used as lighting for vehicles, particularly for interior lighting, such long linear light guides are used directly to prevent glare to the driver and passengers so as not to hinder driving. It is arranged inside the interior member and the case so that it cannot be visually recognized. For this reason, even if it converts into linear light with a light guide, a part of light will be light-shielded and reflected by an interior member or a case, and an illumination pattern will be disturbed. Furthermore, in the vehicle interior lighting applications as described above, since the linear illumination device and the illuminated member (illuminated area) are close to about 20 to 200 mm, the disturbed light is particularly illuminance unevenness, contrast difference, or bright line. It becomes easy to be visually recognized.

  On the other hand, the linear illumination device can illuminate the illuminated member linearly, and the illuminated illumination member can impress the observer with a spatial spread. Here, in the vehicle interior lighting application as described above, since the distance between the lighting device and the member to be illuminated is short, the light emitted from the lighting device reaches the member to be illuminated without much diffusion. For this reason, the light emission shape of the exit surface of the illumination device is easily reflected directly on the illuminated member. In the conventional linear illumination device, since the light guide is simply arranged in a rectangular open case, the shape of the opening is easily reflected as it is at both ends of the linear illumination device. As a result, the boundary of the illumination pattern (the boundary between the illumination area and the illuminated area) is easily visible at both ends of the linear illumination pattern, and the spatial spread to be expressed by the illumination pattern is interrupted by the boundary. On the contrary, there was a problem that gave a spatially narrow impression.

  Also, even if the opening of the case is not a rectangle but a curved shape whose width gradually decreases toward both ends, the difference in the orientation characteristics of the light that propagates through the light guide on the light source side and the other end side The illumination pattern is not symmetric between the two, and the other end side is distorted, and a high-quality illumination pattern cannot be obtained as a whole.

  Accordingly, an object of the present invention is to provide a linear illumination device using a long light guide that can express a spatial spread along the longitudinal direction by improving a difference in illuminance due to a boundary at both ends of the linear illumination pattern. Is to provide.

In order to solve the above problems, a linear illumination device of the present invention has an elongated and long light guide, a case for housing the light guide, and a light source provided at an end in the longitudinal direction of the light guide. The light guide body has one side surface along the longitudinal direction of the light guide body as an emission surface, and the case is opened along the longitudinal direction of the light guide body so that the emission surface of the light guide body is exposed. Furthermore, the light source side end in the longitudinal direction of the light guide in the opening is provided with a light shielding wall having a curved shape that covers the emission surface and is recessed toward the light source. A light-shielding wall that covers the light exit surface is provided at the other end on the opposite side, and further, a light-shaping wall having a curved shape whose wall surface is recessed toward the opening away from the light-shielding wall. Is the main feature.
According to the above configuration, it is possible to obtain a gradation-like illumination mode in which the width gradually decreases at both ends of the illumination pattern and the illuminance gradually decreases, and spatially along the linear illumination pattern with respect to the viewer You can impress with a wide spread. In addition, since the illumination pattern end is formed not by the light-shielding wall but by the light processing wall on the other end side, a high-quality illumination pattern in which the illumination pattern is balanced at both ends can be formed.

Furthermore, in the linear illumination device of the present invention, the curved shape of the light shielding wall on the light source side is curved larger than the curved shape of the light shaping wall, and the curved shape at the tip of the light shaping wall is curved on the light shielding wall on the light source side. The shape is reduced in the longitudinal direction of the light guide. Further, in the depth direction of the opening, it is further characterized in that the tip of the optical shape processing wall is disposed on the opening side farther from the emission surface than the light shielding wall on the light source side.
According to the above configuration, it is possible to more reliably form a higher quality illumination pattern in which the illumination pattern is balanced at both ends.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the linear illuminating device which can express the spatial expansion along a longitudinal direction and can form a high quality linear illumination pattern.

Schematic showing an example of application of linear illumination device to vehicle interior lighting Perspective view of linear illumination device (A) Front view of linear illumination device, (b) AA cross-sectional view, (c) Schematic diagram of illumination pattern (A) BB sectional view, (b) CC sectional view of the linear illumination device Schematic showing an example of arrangement of the linear lighting device on the vehicle interior panel

  The linear illumination device of the present invention will be described with reference to the drawings. Each figure shows each element in a simplified manner for explanation, and is different from an actual scale and size.

FIG. 1 is a schematic view showing an example in which the linear lighting device of the present invention is applied to vehicle interior lighting. Applications of the linear illumination device 1 of the present invention include a ceiling illumination 11 provided on an indoor ceiling, a door trim illumination 12 provided on a door trim to illuminate an armrest, a switch and / or a pocket under the door, and an instrument panel in the vehicle width direction. Examples include an instrument panel illumination 13 that extends and illuminates the inside of the glove box and the operation unit of the instrument panel, a storage illumination 14 that illuminates the console box and the cup holder, and a foot illumination 15 that illuminates the foot.
The present invention may be applied to applications other than those described above, and may be applied not only to vehicle interior lighting but also to vehicle exterior lighting and lighting other than vehicles.

The linear illumination device 1 of the present embodiment will be described with reference to FIGS.
FIG. 2 is a perspective view of the linear illumination device 1, and the linear illumination device 1 includes a long light guide 2, a light source 3, and a case 4 that accommodates these. The light source 3 is connected to a connector (not shown) for supplying power. For the sake of explanation, the region where the light guide 2 is exposed from the case 4, that is, the light emitting region where light is emitted is hatched.

<Light guide 2>
The light guide 2 has a long and thin outer shape, and a vertical cross section with respect to the longitudinal direction of the light guide is a quadrangle, and is formed of a transparent resin. The light guide 2 has an incident surface 21 at an end in the longitudinal direction of the light guide, a reflective surface 22 on one side parallel to the longitudinal direction, and an exit surface 23 on one side facing the reflective surface 22 along the longitudinal direction. , Is provided. In the present embodiment, the length of the light guide 2 in the longitudinal direction is about 500 mm, and the square cross section is a square having a side length of 5 mm. The light source 3 is disposed at the end in the longitudinal direction so as to face the incident surface 21, and the light emitted from the light source 3 and incident inside the light guide is aligned with the light source 3 in the longitudinal direction of the light guide along the longitudinal direction. Is guided to the other end surface 24 which is the opposite end. The guided light is reflected from the reflecting surface 22 toward the emitting surface 23 and is emitted from the emitting surface 23 to illuminate the object to be illuminated linearly. Next, the detail of each structure of the light guide 2 is demonstrated.

  The incident surface 21 is inclined so as to face the reflecting surface 22 so that the optical axis of the light source 3 is refracted toward the reflecting surface 22 when light is incident. When a highly directional LED is used as the light source 3, a lot of light is emitted in the optical axis direction. For this reason, when the incident surface 21 is configured with a plane perpendicular to the reflecting surface 22 and also perpendicular to the optical axis of the light source 3, the light on the optical axis of the light source 3 is not refracted into the light guide. Incident light reaches the other end surface 24 of the light guide 2 with almost no reflection inside the light guide. As a result, the amount of light emitted from the other end surface 24 side of the emission surface 23 is larger than the amount of light on the incident surface 21 side, and it becomes difficult to emit light uniformly from the light guide 2 in a linear shape. However, by inclining the incident surface 21 so as to face the reflecting surface 22, the light from the light source 3 is refracted toward the reflecting surface 22 when passing through the incident surface 21, and as a result, uniform linear light is obtained. Is possible. In order to obtain such an effect, although depending on the length of the light guide 2, the inclination angle of the incident surface 21 with respect to a surface perpendicular to the reflecting surface 22 is about 3 to 7 degrees (the incident surface 21 and the reflecting surface The angle of intersection with 22 may be about 87 to 83 degrees.

The reflecting surface 22 is a side surface along the longitudinal direction of the light guide, and grooves 25 that are V-shaped in the cross section along the longitudinal direction of the light guide are equidistant along the longitudinal direction of the light guide. Are arranged. The surface of the groove 25 that faces the incident surface 21 has irregularities on the surface, and has a function of reflecting / scattering the light guided from the incident surface 21 toward the exit surface 23. Further, the depth of the groove 25 is configured to become deeper as the distance from the incident surface 21 increases.
A stepped notch 26 is formed on the reflecting surface 22 on the end (other end surface 24) side opposite to the incident surface 21 in the light guide longitudinal direction. As will be described later, the notch 26 can be used as a fitting portion for preventing erroneous assembly with respect to the case 4, thereby improving productivity.

<Light source 3>
The light source 3 includes an LED 31 and is arranged so that its optical axis is parallel along the longitudinal direction of the light guide. A bulb or the like can also be used as the light source, but the light source used in the present invention needs to supply light far in the longitudinal direction for linear illumination, so a light bulb that emits light radially in all directions is less preferred. Absent. If it is LED31 with high directivity, since most light can be radiated | emitted to an optical axis direction, it can be used suitably for the linear illuminating device 1 of this invention. Examples of such LED 31 include a shell type, a surface mount type (top view), a side mount type (side view), and a COB (chip on board) type, and so on, depending on the size and desired characteristics. Can be adopted. Note that a connector (not shown) is connected to the light source 3, so that power is supplied and the LED 31 emits light.

<Case 4>
The case 4 is formed of a long box, and one side surface along the longitudinal direction of the light guide is opened so that the emission surface 23 of the light guide 2 is exposed, and the light guide 2 and the light source 3 are accommodated therein. Is done. The case 4 can be formed by resin injection molding. It can be reduced in weight by resin molding and can be suitably used for vehicle interior lighting.

As shown in FIG. 3, the light source 3 did not enter the light guide 2 from the light source 3 side end of the case 4 at the end of the light source 3 in the longitudinal direction of the opening. A light shielding wall 41 is provided to cover the emission surface 23 so that light does not leak. In order to prevent light leakage from the gap between the case 4 and the light guide 2, the light shielding wall 41 is disposed so that at least the tip thereof faces the light emitting surface 23 of the light guide 2. Further, the light shielding wall 41 has a curved shape in which the tip is recessed toward the light source 3 side, and shields light emitted from the emission surface 23 in a curved shape. Thereby, the edge part by the side of the light source 3 of the illumination pattern which illuminates a to-be-illuminated object can be curved.
Further, in the direction perpendicular to the light exit surface 23 of the light guide 2, the light shielding wall 41 is provided on the opening side of the light shielding wall 41 so that the illumination pattern formed in a curved shape by the light shielding wall 41 is shielded and reflected and not disturbed. The light source side wall part 42 is formed so as to be located on the light source 3 side with respect to the position deeper than the curved tip, that is, the tip of the light shielding wall 41 in the longitudinal direction.

Further, on the side opposite to the light source 3 in the longitudinal direction of the opening (on the other end surface 24 side), the portion facing the emission surface 23 of the light guide 2 of the case 4 radiates from the vicinity of the other end surface 24 of the light guide 2. A light shielding wall 43 is provided to cover the emission surface 23 so that the emitted light does not leak. Similar to the light-shielding wall 41 on the light source side, the light-shielding wall 43 is close to the light-emitting surface 23 of the light guide 2 so that light leakage from the gap between the case 4 and the light guide 2 is prevented. Are arranged. Further, the light shielding wall 43 is provided so as to cover the notch 26 provided in the light guide 2 and the protrusion 45 provided in the case 4.
In addition, a wall-shaped optical shape processing wall 44 substantially perpendicular to the light shielding wall 43 is provided on the opening side of the light shielding wall 43 in the direction perpendicular to the light exit surface 23 of the light guide 2. The optical shape processing wall 44 has a curved shape in which the wall surface is recessed toward the direction away from the light source 3, and blocks light emitted from the emission surface 23 in a curved shape. Thereby, the edge part of the other end side of the illumination pattern which illuminates the to-be-illuminated object can be curved.

Here, the operation of the light shielding walls 41 and 43 and the optical shape processing wall 44 of the present invention will be described. In FIG. 3, the outline of the light beam emitted from the light guide 2 is indicated by arrows X and Y, and the region of the illumination pattern formed by the linear illumination device 1 that has a predetermined illuminance or higher (outer shape / outline of the illumination pattern) ) Is indicated by Z. 3A to 3C indicate the approximate positions of the tips of the light shielding walls 41 and 43.
The light guided inside the light guide 2 is guided in a direction away from the light source 3. For this reason, the light emitted from the light guide 2 is somewhat reflected toward the light source 3 by the groove 25 of the reflection surface 22, but most of the light is emitted from the emission surface 23 in a direction away from the light source 3. Is done. For this reason, the optical path (propagation distance) of the light beam X on the light source side tends to be shorter than the optical path of the light beam Y on the other end side, and the light diffuses radially during propagation. Light toward the side tends to diffuse more easily. As shown in FIG. 3C, the illumination pattern formed by such light has a shape in which the other end side extends from the light source side, and the outline of the illumination pattern is easily blurred.
Furthermore, the amount of light emitted from the light guide 2 is more likely to be greater in the vicinity of the light shielding wall 43 on the other end side than in the vicinity of the light shielding wall 41 on the light source side. For this reason, the light-shielding wall 41 on the light source side is easy to form and process the illumination pattern into a predetermined shape depending on the shape, and conversely, the light-shielding wall 43 on the other end side has the same shape as the light-shielding wall 41 on the light source side. The illumination pattern is blurred and difficult to form in a predetermined shape, and it is difficult to balance the illumination pattern on the light source side and the other end side.

  Therefore, in the present invention, the optical shape processing wall 44 is located at a position farther from the light source 3 than the tip of the light shielding wall 43 in order to use light radiated in a direction further away from the light source 3 than the light shielding wall 43 on the other end side. Was provided. Furthermore, in order to prevent the outline of the illumination pattern on the other end side from being blurred compared to the light source side, the light shielding side 41 and the light shielding wall 43 on the other end side are covered in the depth direction of the opening of the case 4. The other end side of the illumination pattern is formed using the tip shape of the optical shape processing wall 44 that is close to the irradiated object. Thereby, it can suppress that the illumination pattern on the other end side extends too much and the outline blurs. Further, the wall surface of the optical shape processing wall 44 is a standing wall shape extending toward the irradiated member and a concave curved surface, so that it functions as a concave reflection surface for the light in the vicinity of the light shielding wall 43 with a large amount of light. It is possible to prevent the illumination pattern from becoming excessively blurred on the other end side than on the light source side.

Further, in order to balance the entire illumination pattern, particularly at both ends of the illumination pattern, the light-shielding wall 41 on the light source side is connected to the light-shaping wall 44 on the other end side in the direction perpendicular to the exit surface 23 of the light guide 2. It arrange | positioned in the position near the output surface 23 rather than the front-end | tip. As a result, the distance from the object to be irradiated can be made farther on the light shielding wall 41 than on the tip of the optical shape processing wall 44, and even on the light source side where the contour of the illumination pattern is difficult to blur, the contour can be blurred by the diffusion of light. It becomes possible.
In addition, by utilizing the fact that the illumination pattern on the other end side extends, the curved shape provided on the light shielding wall 41 and the light shape processing wall 44 that form both ends of the illumination pattern is light shaped on the light shielding wall 41. The wall 44 is configured to be curved more greatly. Thereby, the small curved shape light-shielded and formed by the optical shape processing wall 44 extends, and can be balanced with the illumination pattern on the light source side. Since the illumination pattern by the optical shape processing wall 44 is formed by extending the tip shape of the optical shape processing wall 44 in the longitudinal direction of the light guide, the tip shape of the optical shape processing wall 44 is the light shielding wall 41 on the light source 3 side. Is preferably reduced in the longitudinal direction of the light guide. As a result, the both ends of the illumination pattern can be easily balanced.

The illumination pattern formed in this way has an elongated linear shape along the linear illumination device 1, and both ends thereof are curved so that the direction of the short side is directed toward the distal end (origin) of the curved shape. A gradation-like illumination mode in which the width gradually decreases and the illuminance gradually decreases in a blurred manner toward the tip of the curved shape can be obtained. Therefore, it is possible to impress the viewer with a spatial spread along the linear illumination pattern.
In the present embodiment, the case where the distal end shape of the light shielding wall 41 on the light source 3 side and the distal end shape of the light shape processing wall 44 on the other end side are curved is illustrated, but the short illumination pattern as described above. Any shape that can gradually reduce the width in the direction may be used. Examples of such a shape can be a curved shape configured by combining curves such as a parabola, an ellipse, an arc, or a straight line.

  In addition to the above, the case 4 is formed with a protrusion 45 that is located closer to the light source 3 than the other end surface 24 of the light guide 2 and protrudes toward the notch 26 of the light guide 2. As shown in FIG. 3B, the protrusion 45 is formed so as to be positioned in the notch 26 in a state where the linear illumination device 1 is assembled. By comprising in this way, when the light guide 2 is attached in a different direction, the misassembly can be recognized by the interference between the protrusion 45 and the other end surface 24 of the light guide 2. Further, by providing such a structure at the end in the case 4, it is possible to suppress the influence on the optical properties of the light guide 2.

Further, the light reaching the other end surface 24 of the light guide 2 is reflected by the other end surface 24 or radiated from the other end surface 24 and then reflected by the case 4 to diffuse light and become stray light, thereby disturbing the illumination pattern. It is easy to have an adverse effect. For this reason, in this embodiment, the stray light is radiated to the outside of the linear illumination device 1 by providing the light shielding wall 43 covering the other end surface 24 and a part of the emission surface 23 on the other end side. It is preventing. Further, stray light is also generated by the notch 26 provided in the light guide 2 and the protrusion 45 of the case 4. Therefore, the stray light is provided by providing the light shielding wall 43 so as to cover the notch 26 and the protrusion 46. Can be shielded more reliably.
In order to reliably obtain this light shielding effect, the tip shape of the light shielding wall 43 is not curved like the light shaping wall 44 or the light shielding wall 41 on the light source 3 side, but is linear. Even if it does in this way, since the main body which forms an illumination pattern in the other end side is the optical shape processing wall 44 as mentioned above, the influence which it has on the shape of an illumination pattern can be minimized. As long as stray light from the other end surface 24, the cutout 26, and the protrusion 46 can be sufficiently blocked, for example, the shape of the light blocking wall 43 may be similar to that of the optical shape processing wall 44.

Next, a configuration for fixing and holding the light guide 2 inside the case 4 will be described. The case 4 is U-shaped in cross section having one side open and both side surfaces and a bottom surface, and a fixing portion 46 protrudes from the inner surface of the side surface of the case 4 so as to support the emission surface 23 of the light guide 2. The fixing portion 46 is disposed so as to be positioned between the two adjacent grooves 25 so as not to block the light reflected by the grooves 25 of the light guide 2 and radiated to the outside.
On the other hand, when the fixing portion 46 protruding from the side surface of the case 4 is subjected to resin injection molding, the fixing portion 46 is undercut, so that the moldability is deteriorated. For this reason, the moldability by injection molding improves by providing the non-molding part (hole) 47 in the side and bottom from the fixed part 46 to the bottom. The groove 25 of the light guide 2 reflects light while leaking light to the outside of the light guide. Therefore, in order to prevent light from leaking from the non-molded portion 47 serving as a hole, the non-molded portion 47 is preferably formed so as to be positioned between the adjacent grooves 25, similarly to the fixing portion 46.
With the above configuration, it is possible to prevent the light reflected by the groove 25 and optically controlled from being disturbed by the fixed portion 46 and / or leaking from the non-molded portion 47, and the illumination pattern is disturbed by the case 4 and the light is lost. Can be suppressed.

  An example in which the linear illumination device 1 configured as described above is attached to the back surface of the vehicle interior panel 5 is shown in FIG. A screw fixing rib protrudes from behind the bottom surface of the case 4 holding the light guide 2 and is fixed to the vehicle interior panel 5 with a screw. FIG. 5A is a perspective view seen from the back side, and also shows a cross-sectional view in the vicinity of the screw fixing rib. FIG.5 (b) is sectional drawing in the surface containing this screw | thread.

  The vehicle interior space is configured by a curved surface because it can be touched by passengers, and the vehicle interior panel 5 to which the linear illumination device 1 is attached is often inclined. Accordingly, it is necessary to attach the linear illumination device 1 to the inclined vehicle interior panel 5. Here, a harness 32 is connected to the light source 3 of the linear illumination device 1, and the harness 32 is routed along the vehicle interior panel 5 in order to facilitate wiring work. Further, by installing the connection direction for connecting the harness 32 to the light source 3 and the longitudinal direction of the light source 3 so as to follow the shape of the vehicle interior panel 5, the overall size can be reduced in the assembled state.

  Furthermore, in order to illuminate a predetermined region, it is necessary to adjust the direction of the optical axis emitted from the linear illumination device 1, and therefore, particularly when the light guide 2 having a quadrangular cross section exemplified in this embodiment is used, the exit surface It is necessary to adjust the radiation direction of light by arranging 23 toward a predetermined area. For this reason, it may be difficult to match the direction of the light guide body 2 having a quadrangular cross section with the longitudinal direction or the short direction of the light source 3 arranged to be inclined as described above. Therefore, in the present invention, as shown in FIG. 5B, the light guide 2 is attached by being rotated by about 45 degrees with respect to the longitudinal direction of the light source 3 and has a U-shaped cross section so as to accommodate the light guide 2. Both side surfaces and bottom surfaces, and further, ribs for fixing screws to be attached to the vehicle interior panel 5 are configured not to jump out of the outer shape of the light source 3 when viewed from the longitudinal direction of the linear illumination device 1. Thereby, the linear illuminating device 1 can be comprised compactly as a whole, and it is possible to radiate | emit light in a predetermined direction. In order to increase the reflector function by enlarging both side surfaces of the case 4 so as to obtain a predetermined illumination pattern, only the both side surfaces protrude from the outer shape of the light source 3 to enlarge the linear illumination device 1. Can be kept to a minimum.

  In the above embodiment, the case 4 is exemplified as a housing member different from the mounting member such as the interior member or the housing member on the vehicle side, but may be integrated with the mounting member on the vehicle side according to the mounting location. . As such an example, in the case of the instrument panel illumination 13, the case 4 is integrally formed on the back surface of the instrument panel member, or in the case of the storage illumination of the console part, the case 4 is integrated inside the storage member of the console part. Etc. can be exemplified. By providing the case 4 integrally on the back surface (inside) of the vehicle interior member, the number of parts can be reduced.

  The present invention is particularly applicable to vehicle interior lighting in which the linear illumination device and the object to be illuminated are close to each other and the distance between them is narrow. In addition, the present invention is not limited to vehicle interior lighting, and can be applied to vehicle exterior lighting or lighting other than a vehicle within a range not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Linear illuminating device 2 Light guide 3 Light source 4 Case 5 Car interior panel

Claims (5)

An elongated and long light guide, a case for housing the light guide, and a light source provided at an end in the longitudinal direction of the light guide,
The light guide body has one side surface along the light guide body longitudinal direction as an emission surface,
The case has an opening along the longitudinal direction of the light guide so that the exit surface of the light guide is exposed,
A light-shielding wall having a curved shape that covers the emission surface and is recessed toward the light source side is provided at an end of the opening on the light source side in the longitudinal direction of the light guide,
The other end of the opening opposite to the light source in the longitudinal direction of the light guide is provided with a light shielding wall that covers the emission surface, and the wall is further away from the light source on the opening side than the light shielding wall. An optical shape processing wall having a curved shape recessed toward the surface is provided,
A linear illumination device characterized by that. The linear illumination device according to claim 1, wherein a curved shape of the light shielding wall on the light source side is larger than a curved shape of the optical shape processing wall. The curved shape at the tip of the optical shape processing wall is a shape obtained by reducing the curved shape of the light shielding wall on the light source side in the longitudinal direction of the light guide.
The linear illumination device according to claim 1, wherein the linear illumination device is provided. The front end of the optical shape processing wall in the depth direction of the opening is arranged on the opening side farther from the light exit surface than the light shielding wall on the light source side. The linear illumination device according to item. The light guide is provided with a stepped notch on the other end side in the longitudinal direction of the light guide,
On the inner surface of the case facing the notch, a protrusion that protrudes into the notch is provided,
5. The linear illumination according to claim 1, wherein the light shielding wall on the other end side is provided so as to cover the emission surface, the notch, and the protrusion. apparatus.

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