JP4718405B2 - Lighting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device capable of securing a light amount of light emitted in a linear form by using a light source and a light guide means. <P>SOLUTION: In the illumination device 20, since a plurality of LED chips 33 are arranged in an emitting device 21, the plurality of LED chips 33 are sealed by using a sealing body 31 containing light scattering materials so as to form an independent convex part, and a linear light source 27 is formed by arranging an emitting device 21 installed on a substrate 30 so as to separate the outside of the sealing body 31 and to surround a slope 38 at one end of a light guide plate 22, the light emitted from the sealing body 31 can be enhanced in light coupling efficiency of the emitting device 21 and the light guide plate 22, and the light can be irradiated on an object at a suitable brightness. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an illuminating device that emits linear light used in, for example, a document reading device.

  As a conventional technique, a cold cathode tube (CCFL) is used as a light source used in a linear illumination device for reading an original of a color scanner. However, since the cold cathode tube contains mercury, which is a harmful substance, an illumination device using a light emitting diode (abbreviated as LED) that does not contain mercury as a light source has been realized.

  In the illumination device of the first conventional technique, an illumination device using an LED as a light source is disclosed. An illumination device using such an LED as a light source has a problem that the amount of light is weaker than that of a cold cathode tube. Therefore, an LED can be used in a document reading device using a contact image sensor, but a high-performance document reading device using a reduction optical system that has a deep subject depth and high-precision reading can emit light. Insufficient to use. For this reason, the illuminating device which uses LED with a large light quantity as a light source is desired.

As a method for increasing the output light amount of an illumination device that uses an LED as a light source, there is a method for increasing the light amount of the LED itself. As a method for increasing the light quantity of the LED, for example,
(1) An LED using an LED chip having a large chip area is used.
(2) A plurality of LEDs are used.
Etc. When an LED using an LED chip with a large chip area is used as in (1), the light emitting portion increases in area and the amount of light increases. However, the current injected for the internal resistance of the LED chip spreads throughout the light emitting portion. It will disappear. As a result, if the area is increased more than necessary, the light conversion efficiency with respect to the input power decreases. As a result, the heat generated by the LED chip increases, and the temperature of the LED chip itself, which is a semiconductor, increases. Although the emission wavelength of the LED is determined by the semiconductor band gap, the semiconductor band gap changes sensitively with temperature, so that the emission wavelength changes due to the temperature rise of the LED chip and the color of the light source changes. In addition, since the light emission efficiency varies depending on the temperature, it is difficult to keep the brightness of the light source constant. In addition, if heat dissipation is taken into consideration in order to reduce the temperature change, there is a problem that the price of the LED is increased.

  Further, as in (2), when a plurality of LEDs are used, it is difficult to cause light from the plurality of LEDs to enter a desired incident position on the light guide plate constituting the illumination device. In addition, when a plurality of LEDs are used, there is a difference in the incident position of light from each LED to the light guide plate. There is a problem that variation occurs in the color tone distribution of the light source inside, making it difficult to use as a light source for a scanner.

  In order to solve such a problem, a technique in which a package for mounting an LED is improved is disclosed. FIG. 16 is a front view showing an example of a conventional LED package 1. FIG. 17 is a perspective view showing another example of a conventional LED package 2. As shown in FIG. 16, the LED chip 3 is sealed with a resin 4, and the light emission angle is narrowed by forming the outer shape of the sealing resin 4 into a lens shape. However, since the light 5 emitted from the side surface of the LED chip 3 cannot enter the light guide plate, it is not suitable for the lighting device. As shown in FIG. 17, an LED chip (not shown) called a chip type LED is mounted on a circuit board 6 and sealed with a resin 7. Since light is emitted from all the upper and side surfaces of the resin 7, it is not suitable for coupling light to a light guide plate disposed on one side of the LED package 1.

  As an illumination device according to the second conventional technique for solving such a problem, an LED device in which a plurality of LED chips are mounted in one package and a light-scattering material is contained in a light-transmitting resin that covers the plurality of LED chips. A lighting device is disclosed in which light is efficiently incident on a light guide plate by closely attaching the LED device to a light incident end surface of the light guide plate (for example, see Patent Document 1).

  Moreover, the LED apparatus which narrows the directivity of the emitted light as an LED apparatus of the 3rd prior art is disclosed. FIG. 18 is a cross-sectional view showing a third conventional LED device 8. In the LED device 8, a sealing resin 10 that covers the LED chip 9 is provided as low as possible from the top of the reflector 11, and the reflector 11 narrows light having a wide directivity angle that comes out of the sealing resin 10. (For example, refer to Patent Document 2). FIG. 19 is a cross-sectional view showing the LED device 8a from which the sealing resin is removed from the LED device of the third prior art. When the light source 9a is in the center of the bottom of the reflector 11 and is not covered with resin, the emitted light 12 from the light source 9a is radiated to the upper surface of the LED device 8a through a path as shown in FIG. The radiation angle of the LED device 8a is determined by the opening angle φ1.

  Further, as a fourth conventional technique, an LED device configured by separating a sealing resin covering an LED chip and a reflector is disclosed. In this LED device, even the light emitted from the LED chip along the substrate surface is radiated upward by the reflector to narrow the directivity angle (see, for example, Patent Document 3).

JP 2001-343531 A JP 2004-274027 A JP 2004-327955 A

  In the LED device of the second prior art described above, since the sealing resin is filled up to the vicinity of the opening of the reflector, the light refracted on the surface of the sealing resin spreads as it is. As a result, the radiation angle becomes larger than the opening angle of the reflector. In particular, at the outer edge near the reflector of the sealing resin, it is curved in such a shape that the vicinity of the central axis becomes the bottom due to the surface tension before the resin is cured, and is cured as it is, so that the sealing resin acts as a concave lens, There is a problem that the radiation angle is further increased. This phenomenon is the same even when the sealing resin is filled with a light diffusing material, and the directivity of the LED device is widened, and a part of the light incident on the light guide plate leaks from the light guide plate in the vicinity of the incident position. As a result, there is a problem that the output light quantity of the lighting device is reduced.

  The LED devices of the third and fourth prior arts described above have been developed for the purpose of giving a predetermined radiation angle in the front direction of light emission and obtaining a uniform illumination effect without luminance unevenness. Therefore, it is not disclosed how to suitably realize an illumination device that emits linear light using such an LED device and a light guide. Therefore, as a result of intensive studies by the present inventors, the light to the light guide means exceeds the effect of eliminating luminance unevenness by using a resin for protecting the LED chip and a reflector for giving a predetermined directivity angle. It has been found that there is an effect of increasing the coupling efficiency.

  Therefore, the objective of this invention is providing the illuminating device which can ensure the light quantity of the light radiate | emitted linearly using a light source and a light guide means.

The present invention includes an emitting unit that emits light, an incident surface on which light that is emitted from the emitting unit is incident, and a light guide unit that has an emitting surface substantially perpendicular to the incident surface. A lighting device,
The emitting means includes
A light source;
A mounting table on which the light source is mounted;
A sealing body that has translucency, covers the outer periphery of the light source, and integrally seals the light source on the mounting table;
A reflector having light reflectivity, provided apart from the sealing body, surrounding the sealing body, and reflecting light emitted from the light source via the sealing body to the incident surface;
The light guiding means includes
A bottom surface that is continuous with the entrance surface and faces the exit surface;
The incident surface, the emission surface and the bottom surface, and having two side surfaces facing each other,
The two side surfaces are formed in a tapered shape so as to be separated from each other toward the exit surface from the bottom surface,
The sealing body includes a light scattering agent that increases an emission area of light emitted from a light source.

The present invention also includes an emitting unit that emits light, and a light guide unit that has translucency and has an incident surface on which light emitted from the emitting unit is incident and an exit surface that is substantially perpendicular to the incident surface. A lighting device comprising:
The emitting means includes
A light source;
A mounting table on which the light source is mounted;
A sealing body that has translucency, covers the outer periphery of the light source, and integrally seals the light source on the mounting table;
A reflector having light reflectivity, provided to surround the sealing body and spaced from the sealing body, and reflects light emitted from the light source through the sealing body to guide to the incident surface, An incident area of light from the light source on the incident surface includes a reflector that makes the incident area smaller than the incident surface;
The light guiding means includes
A bottom surface that is continuous with the entrance surface and faces the exit surface;
The incident surface, the emission surface and the bottom surface, and having two side surfaces facing each other,
The two side surfaces are formed in a tapered shape so as to be separated from each other toward the exit surface from the bottom surface,
The sealing body includes a light scattering agent that increases an emission area of light emitted from a light source.

  Furthermore, the invention is characterized in that the bottom surface facing the exit surface of the light guide means has at least one of light reflectivity and light diffusibility.

  Furthermore, the invention is characterized in that the reflector has an inclined surface whose diameter increases as it goes in the emission direction of the light source.

  Furthermore, the present invention is characterized in that an end facing the incident surface of the reflector is provided in close contact with the incident surface.

Furthermore, the present invention is characterized in that the incident surface has a convex portion that is convex toward the reflector.

Furthermore, the invention is characterized in that the convex portion has a pyramid shape or a conical shape.
Furthermore, the present invention is characterized in that an apex angle of the convex portion is larger than an opening angle of the reflector.

  Furthermore, the present invention is characterized in that the width of the bottom of the convex portion is larger than the width of the end facing the incident surface of the reflector.

  Furthermore, the invention is characterized in that the axis of the convex portion intersects the bottom surface facing the exit surface of the light guide means.

  Furthermore, the present invention is characterized in that an apex of the convex portion is arranged on the light source side from an end portion facing the incident surface of the reflector.

  Furthermore, the present invention is characterized in that the convex portion is arranged so as to be in contact with an inclined surface of the reflector.

Furthermore, the present invention is characterized in that a tip portion of the convex portion is formed in a flat shape.
Furthermore, the invention is characterized in that the reflector is white.

Furthermore, the present invention provides the reflector,
A reflector body made of resin;
It covers the surface of the reflector body and includes a plating layer made of silver or aluminum.

Furthermore, the present invention provides the reflector,
A reflector body made of resin;
Covering the surface of the reflector body, and an underlayer made of Mo (molybdenum), W (tungsten), Ti (titanium) or their eutectic metal;
It covers the surface of the underlayer and includes a plating layer made of silver or aluminum.

  Furthermore, the present invention is characterized in that the reflector further includes a dielectric layer that covers the surface of the plating layer and is made of a dielectric.

Furthermore, the invention is characterized in that the reflector is made of metal .

  Furthermore, the present invention is characterized in that the light scattering agent is a phosphor that absorbs a wavelength of light emitted from a light source and converts it into light having a longer wavelength.

Furthermore, the invention is characterized in that the light scattering agent is a light-transmitting fine particle.
Furthermore, the invention is characterized in that the sealing body is formed in a lens shape having an optical axis substantially the same as the light emission axis of the light source.

Furthermore, the present invention is characterized in that the light source includes a plurality of light emitting diodes.
Further, in the present invention, the light source includes a plurality of light emitting diodes,
Each of the light emitting diodes emits light of the same color.

Further, in the present invention, the light source includes a plurality of light emitting diodes,
Among the light emitting diodes, at least one light emitting diode emits light of a color different from that of the other light emitting diodes.

According to the present invention, the lighting device includes the emitting means and the light guiding means. The emission means includes a light source, a mounting table, a sealing body, and a reflector. The reflector has light reflectivity, is provided so as to be separated from the sealing body and surrounds the sealing body, and is configured to reflect light emitted from the light source through the sealing body and guide it to the incident surface. Is done. Therefore, the light emitted from the light source is guided to the incident surface of the light guide means by the reflector. The light guided to the incident surface is guided by the light guide means and emitted from the exit surface. By providing the reflector away from the sealing body in this way, the light coupling efficiency between the emitting means and the light guiding means can be increased for the light emitted from the sealing body. As a result, the amount of light emitted from the light source can be prevented from decreasing until it is emitted from the exit surface of the light guide means, and a desired amount of light is ensured. In addition, since the sealing body includes a light scattering agent that increases the emission area of light emitted from the light source, it is possible to increase the emission area of light emitted from the light source and make the light amount distribution in the emission area uniform. it can. Therefore, the light emitted from the exit surface of the light guide means can be made into planar light with a uniform amount of light. By using such an illuminating device, the object can be irradiated with light with suitable brightness. The light guide means includes a bottom surface that is continuous with the incident surface and faces the output surface, and two side surfaces that are continuous with the incident surface, the output surface, and the bottom surface and that face each other. It forms in the taper shape so that it may mutually separate as it goes to. Thereby, since the light reflected on the side faces toward the exit surface, the output light quantity can be increased.

According to the invention, the lighting device includes the emitting means and the light guiding means. The emission means includes a light source, a mounting table, a sealing body, and a reflector. The reflector has light reflectivity, is provided so as to be separated from the sealing body and surrounds the sealing body, and is configured to reflect light emitted from the light source through the sealing body and guide it to the incident surface. Is done. Therefore, the light emitted from the light source is guided to the incident surface of the light guide means by the reflector. The light guided to the incident surface is guided by the light guide means and emitted from the exit surface. By providing the reflector away from the sealing body in this way, the light coupling efficiency between the emitting means and the light guiding means can be increased for the light emitted from the sealing body. In addition, the reflector makes the incident area of the light from the light source on the incident surface enter smaller than the incident surface, so that the light emitted from the emitting means can surely enter the incident surface of the light guiding means. In addition, the optical coupling efficiency between the emitting means and the light guiding means can be increased. As a result, the amount of light emitted from the light source can be prevented from decreasing until it is emitted from the exit surface of the light guide means, and a desired amount of light is ensured. In addition, since the sealing body includes a light scattering agent that increases the emission area of light emitted from the light source, it is possible to increase the emission area of light emitted from the light source and make the light amount distribution in the emission area uniform. it can. Therefore, the light emitted from the exit surface of the light guide means can be made into planar light with a uniform amount of light. By using such an illuminating device, the object can be irradiated with light with suitable brightness. The light guide means includes a bottom surface that is continuous with the incident surface and faces the output surface, and two side surfaces that are continuous with the incident surface, the output surface, and the bottom surface and that face each other. It forms in the taper shape so that it may mutually separate as it goes to. Thereby, since the light reflected on the side faces toward the exit surface, the output light quantity can be increased.

  Furthermore, according to the present invention, the bottom surface facing the exit surface of the light guide means has at least one of light reflectivity and light diffusibility. Accordingly, when light incident from the incident surface is incident on the bottom surface, the light can be reflected or diffused. This prevents light from leaking from the bottom surface and allows light to be emitted from the exit surface. Therefore, the light incident on the incident surface can be efficiently emitted from the emission surface, and a desired amount of light can be obtained.

  Furthermore, according to the present invention, the reflector has an inclined surface whose diameter increases as it goes in the emission direction of the light source. As a result, the light incident on the reflector can be reliably guided in the emission direction of the light source. Therefore, the light emitted from the light source can be efficiently guided to the light guide means.

  Furthermore, according to this invention, the edge part which faces the entrance plane of a reflector, and the said entrance plane are closely_contact | adhered and provided. As a result, the light reflected by the reflector can be prevented from leaking from between the reflector and the incident surface, and can be reliably incident.

Furthermore, according to this invention, an entrance plane has a convex part which becomes convex toward a reflector. By providing such a convex portion, the incident angle of light incident on the incident surface can be increased, and the light incident from the incident surface can be confined to the light guide means. As a result, the amount of light emitted from the emission surface can be increased.

  Furthermore, according to the present invention, since the convex portion has a pyramid shape or a conical shape, the light incident from the incident surface can be preferably confined.

  Furthermore, according to the present invention, since the apex angle of the convex portion is larger than the opening angle of the reflector, total reflection near the convex portion can be increased, and incident light can be confined appropriately.

  Further, according to the present invention, since the width dimension of the bottom of the convex part is larger than the width dimension of the end part facing the incident surface of the reflector, the light from the reflector can be reliably incident on the convex part.

  Further, according to the present invention, since the axis of the convex portion is configured to intersect the bottom surface facing the exit surface of the light guide means, the amount of light that can be directly guided to the exit surface from the convex portion Can be more. This can reduce the attenuation of light up to the exit surface.

  Furthermore, according to this invention, the vertex of a convex part is arrange | positioned at the light source side from the edge part which faces the entrance plane of a reflector. Accordingly, it is possible to reduce the light scattered outside without entering the convex portion from the reflector, and it is possible to increase the light incident on the convex portion from the reflector.

  Furthermore, according to this invention, a convex part is arrange | positioned so that it may contact | connect on the inclined surface of a reflector. Accordingly, it is possible to reduce the amount of light scattered outside without being incident on the convex portion from the reflector.

  Furthermore, according to this invention, the front-end | tip part of a convex part is formed in flat shape. Thereby, the protruding dimension of the convex portion can be reduced. Thus, even when the projection is disposed closer to the light source than the end facing the incident surface of the reflector, the tip of the projection can be prevented from undesirably coming into contact with the sealing body.

  Furthermore, according to the present invention, since the reflector is made of white resin, it is possible to prevent the amount of reflected light from being attenuated by the color of the reflector. Thereby, the light emitted from the light source can be efficiently reflected.

  Furthermore, according to the present invention, the reflector main body can be easily formed of resin, and the surface of the reflector main body can be made light-reflective by plating with silver or aluminum. Thereby, it is possible to realize a reflector capable of reflecting light appropriately.

  Furthermore, according to this invention, a reflector main body can be easily formed with resin. In addition, it covers the surface of the reflector body and includes a base layer made of Mo, W, Ti or their eutectic metal and a base layer and a plated layer made of silver or aluminum. Property can be improved. As a result, the plating layer can be reliably formed rather than directly forming the plating layer on the reflector body made of resin. By providing such a plating layer, the surface of the reflector can have light reflectivity. Thereby, it is possible to realize a reflector capable of reflecting light appropriately.

  According to the invention, the reflector further includes a dielectric layer covering the surface of the plating layer and made of a dielectric. Since the plating layer is made of silver or aluminum as described above, the oxidation of the plating layer can be prevented by covering such a plating layer with a dielectric layer. Accordingly, it is possible to prevent the light reflecting function of the reflector from being deteriorated due to oxidation, and it is possible to extend the life of the reflector.

  Furthermore, according to the present invention, since the reflector is made of metal, a reflector having light reflectivity can be realized.

  Furthermore, according to the present invention, the light scattering agent is a phosphor that absorbs the wavelength of light emitted from the light source and converts it into light having a longer wavelength. Thereby, the light emitted from the sealing body can be turned into white light by the light emitted from the light source and the light whose wavelength is converted by the light scattering agent. Therefore, white light can be emitted from the emission surface to irradiate the object suitably.

  Furthermore, according to the present invention, the light scattering agent is a fine particle having translucency. Thus, a light scattering agent that scatters light from the light source can be realized.

  Furthermore, according to the present invention, the phosphor is formed in a lens shape having an optical axis substantially the same as the light emission axis of the light source. Thereby, the light emitted from the light source can be prevented from being scattered outside, and can be incident on the reflector and the incident surface.

  Furthermore, according to the present invention, since the light source includes a plurality of light emitting diodes, the light amount of the light source can be selected according to the number of light emitting diodes. Thereby, a desired light amount can be obtained.

  Furthermore, according to the present invention, since the light source includes a plurality of light emitting diodes, the light amount of the light source can be selected according to the number of light emitting diodes. Each light emitting diode emits light of the same color. Accordingly, the light emitted from the sealing body can be turned into white light by the light whose wavelength is converted by the light scattering agent and the light emitted from the light source.

  Furthermore, according to the present invention, since the light source includes a plurality of light emitting diodes, the light amount of the light source can be selected according to the number of light emitting diodes. Of the light emitting diodes, at least one light emitting diode emits light of a different color from the other light emitting diodes. Accordingly, the light emitted from the sealing body can be turned into white light by the light whose wavelength is converted by the light scattering agent and the light emitted from the light source.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. Portions corresponding to the matters described in the preceding forms in each embodiment are denoted by the same reference numerals, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

  FIG. 1 is a front view showing a lighting device 20 according to a first embodiment of the present invention. FIG. 2 is a plan view showing the lighting device 20. FIG. 3 is a side view showing the lighting device 20. The illumination device 20 includes an emission device 21 that emits light, and a light guide plate 22 that guides light from the emission device 21. The illuminating device 20 converts the light emitted from the emission device 21 into light having a linear emission region by the light guide plate 22, and irradiates the object in the linear irradiation region. First, the light guide plate 22 will be described, and then the emission device 21 will be described.

  The light guide plate 22 is a light guide means and has translucency, an incident surface 23 on which light emitted from the emitting device 21 is incident, an exit surface 24 that is substantially perpendicular to the incident surface 23, and an exit surface 24. , An opposite surface 26 facing the incident surface 23, and two side surfaces 28 that are substantially perpendicular to the incident surface 23 and the exit surface 24. In this embodiment, the light guide plate 22 is configured in a quadrangular prism shape extending along the optical axis direction X, which is the direction in which the optical axis of the light source 27 of the emission device 21 extends. The incident surface 23 is one end surface 23 in the optical axis direction X, and is a surface 23 including a radial direction Z and a width direction Y perpendicular to the optical axis of the emission device 21. The radial direction Z is a direction orthogonal to the width direction Y. The emission surface 24 is one end surface 24 in the radial direction Z, and is a surface 24 including the optical axis direction X and the width direction Y. In the present embodiment, the length dimension in the radial direction Z is configured to be larger than the length dimension in the width direction Y. The bottom surface 25 has at least one of light reflectivity and light diffusibility. The light guide plate 22 is made of a translucent resin such as acrylic and polycarbonate.

  Light emitted from the emission device 21 enters the light guide plate 22 from the incident surface 23. Since the light incident from the incident surface 23 is incident near the incident surface 23, the loss increases when light leaks from the side surface 28. Even if the light is incident from the incident surface 23, the ratio of the light leaking from the side surface 28 increases as the angle of incidence on the side surface 28 decreases. The component having a small incident angle to the side surface 28 of light is a component having a large incident angle in terms of the incident angle to the incident surface 23. Therefore, if there are many components having a large incident angle to the incident surface 23, the reflectance at the side surface 28 becomes low, and therefore leakage from the side surface 28 increases. Further, if the incident angle of the light emitted from the emitting device 21 to the incident surface 23 is large, the reflectance at the incident surface 23 also increases rapidly, so the proportion of the light incident on the light guide plate 22 decreases. Therefore, it is important to use the emission device 21 that can control the radiation angle. The light incident on the light guide plate 22 is directly emitted from the output surface 24, but most of the light is diffused and reflected by the bottom surface 25 of the light guide plate 22 and is emitted from the output surface 24. In particular, the light is reflected from the side surface 28 of the light guide plate 22 or the opposite surface 26 facing the entrance surface 23, and then reflected from the inside of the light guide plate 22 many times before being emitted from the exit surface 24 or from the bottom surface 25. There is much light that is diffused and reflected and emitted from the exit surface 24.

  The bottom surface 25 is configured to guide light incident on the bottom surface 25 to the upper exit surface 24 by a method such as forming a grating according to the shape of the mold for creating the light guide plate 22. The bottom surface 25 may be configured to have light diffusibility by, for example, printing a diffusing material and roughening the surface with sandblast. The side surface 28 is formed in a so-called taper shape so that the dimension in the width direction Y increases from the bottom surface 25 toward the emission surface 24 so that the light reflected by the side surface 28 is easily incident on the bottom surface 25. In other words, it is preferable to slightly incline from the perpendicular to the radial direction Z. As a result, the light reflected by the side surface 28 is directed toward the exit surface 24, so that the amount of output light can be increased. Further, the dimension of the incident surface 23 in the width direction Y is configured to be larger than the opening 29 of the emission device 21. As a result, all the light output from the emission device 21 can be incident on the light guide plate 22.

  The light exit surface 24 of the light guide plate 22 is configured to have a lens effect, and is configured so that light emitted from the output surface 24 has a linear irradiation region extending along the optical axis direction X. The emission surface 24 is formed in, for example, a semispherical shape that protrudes outward in the emission direction Z. By forming in this way, it is possible to illuminate an object, for example, a document by narrowing down to a linear shape.

  Further, the opposite surface 26 of the light guide plate 22 is configured to have light reflectivity. The opposite surface 26 is provided with a reflective film such as a metal thin film such as aluminum or silver, so that the light incident on the light guide plate 22 can be eliminated from the opposite surface 26 as it is.

  Next, the emission device 21 will be described. FIG. 4 is a perspective view showing the emission device 21. FIG. 5 is a plan view showing the emission device 21. The emission device 21 includes a light source 27, a substrate 30 on which the light source 27 is placed, a sealing body 31, and a reflector 32. The light sources 27 include a plurality of light emitting diode (Light Emitting Diode: LED) chips 33 in the present embodiment. Each LED chip 33 is placed on the substrate 30. The LED chip 33 is a chip size LED chip 33 having a chip size of, for example, about 0.3 mm square and excellent in conversion efficiency to light with respect to input power. By using a plurality of the LED chips 33, It is possible to realize the light source 27 that can increase the light amount of the emission device 21 with the best light conversion efficiency, reduce the amount of heat generation, and suppress the change in luminous intensity and chromaticity. The optimum value of the size of the LED chip 33 is considered to be determined by the shape of the electrode, the resistivity of the crystal from the electrode to the light emitting layer, and the like, but the above dimensions are the most efficient at present. Further, the shape in plan view is not limited to a square but may be a rectangle. Since the shape of the chip is determined by the crystal structure, it may be rectangular or square for cubic crystals, but may be hexagonal or triangular for hexagonal crystals such as sapphire and GaN substrates.

  The substrate 30 is a mounting table and has a main surface 34 on which each LED chip 33 is mounted. The substrate 30 has a substantially rectangular plate shape, and terminal electrodes 35 having conductive properties are provided on two opposite sides of the substrate 30. The main surface 34 is one surface 34 in the thickness direction of the substrate 30, and a plurality of metal pad portions 36 are arranged on the main surface 34. Each metal pad portion 36 is a thin metal film having conductivity, and is formed on the main surface 34 so as to cover different regions with a gap therebetween. The terminal electrode part 35 is electrically connected to the metal pad part 36. The lower surface of the LED chip 33 is bonded to the metal pad portion 36 of the main surface 34 with a conductive adhesive. The upper surface of the LED chip 33 and the metal pad portion 36 are electrically connected by wire bonding using a metal wire 37. Such connection between the LED chip 33 and the metal pad 36 is not limited to the metal wire 37, and a conductive paste, a fine metal ball (flip chip bonding), or the like may be used. In addition, when high power is applied to make the LED chip 33 have high luminance, the substrate 30 may be made of a material with high heat dissipation such as metal and ceramic.

  The sealing body 31 is made of a light-transmitting resin, covers the outer periphery of the light source 27, and seals the light source 27 and the substrate 30 integrally. The sealing body 31 seals the electrode of the LED chip 33 and the metal wire 37 that connects the wiring. As a result, the sealing body 31 protects the LED chip 33 and the metal wire 37 from mechanical shocks, and separates the semiconductor LED chip 33 from external oxygen and moisture to prevent deterioration due to a photochemical reaction. Can do. Alternatively, the LED chip 33 may be mounted on the lead frame, and the lead frame may be integrated by the sealing body 31. The sealing body 31 is formed in a lens shape having an optical axis substantially parallel to the light emission axis of each LED chip 33. Therefore, the sealing body 31 is formed to be an independent convex portion so as to protrude from the main surface 34. The material constituting the sealing body 31 is most preferable because, for example, a silicon resin does not change with respect to high-energy blue light and ultraviolet light, but an epoxy resin, a polycarbonate resin, an acrylic resin, a polyethylene resin, a polystyrene resin, or the like may be used. . When the plurality of LED chips 33 are integrally sealed, the light emitting materials from the individual LED chips 33 are sealed with a light-transmitting sealing resin containing a light scattering material (not shown) so that they cannot be seen separately. . As a result, the entire sealing body 31 can emit light uniformly. Such light emission is the same regardless of whether the light emission colors of the LED chips 33 are the same or different. When the emission colors of the LED chips 33 are different, the wavelength variation between the LED chips 33 can be equalized and light can be incident on the light guide plate 22, and the variation in the chromaticity distribution of the light source 27 can be suppressed. As the light scattering agent, for example, a phosphor that absorbs the wavelength of light emitted from each LED chip 33 and converts it into light having a longer wavelength is used. By sealing with a phosphor 31 having a particle size of about several tens of μm to several μm, for example, a YAG phosphor activated with Ce, the wavelength is converted by the emission color of the LED chip 33 and the phosphor. White light can be generated by mixing colors. Therefore, even if there is a wavelength variation between the LED chips 33, substantially white light can be incident on the light guide plate 22, and variations in the chromaticity distribution of the light source 27 in the light source 27 can be suppressed. When using a phosphor, the phosphor itself plays the role of a light scattering material, but in order to obtain optimum light mixing by controlling the scattering characteristics and spectral shape separately, a light scattering material is used separately from the phosphor. It is desirable to put in.

  As the light source 27, a light source 27 having high color rendering properties is desirable for reading a color document. However, a white light source 27 may be used for a normal document, and a single color document may be used for a specific color document. The LED chip 33 for realizing such a light source 27 will be described. As the white light source 27, a GaN-based LED chip 33 having a peak wavelength of 460 nm, in which a GaN-based blue light-emitting diode is sealed with a sealing body 31 containing a phosphor such as YAG: Ce, is used. Further, as the light source 27 with good color rendering properties, a green LED (GaN-based or the like), an InGaAsP / GaAs-based LED chip 33, and an InGaAlP / GaAs-based red LED RGB type LED are used. Here, the GaN-based LED chip 33 is a p-type composed of a GaxAlyInzN crystal (an element in which the anion is nitrogen and the cation is selected from Ga, In, or Al. X + y + z = 1) that has substantially the same lattice constant as GaN. , A semiconductor element composed of an n-type semiconductor. The InGaAsP / GaAs LED chip 33 is a GaxAlyInzP crystal whose substrate 30 is substantially GaAs and whose lattice constant is substantially the same as that of the substrate 30 (anion is phosphorus and a cation is selected from Ga, In, or Al). This is a semiconductor element composed of p-type and n-type semiconductors composed of x + y + z = 1). Here, the meaning that the substrate 30 and the lattice constant are substantially the same means that the lattice constant is different to the extent that dislocation does not occur due to internal stress.

  Further, for example, the sealing body 31 may include two types of phosphors: a phosphor that emits green light when excited by a blue LED and a blue LED, and a phosphor that emits red light when excited by a blue LED. . Such phosphors emitting green light include Eu-activated alkaline earth metal silicate phosphors and sialon phosphors, and phosphors emitting red light include nitride phosphors.

  As a light scattering agent, the wavelength is converted by the phosphor among the emitted light of the LED chip 33 by including a lot of fine particles (for example, several μm or less) having a small particle diameter, which is made of a light-transmitting silica together with the phosphor. It can be made to act as a light scattering material with respect to the light which was not made. Due to this scattering effect, wavelength variation in the light source 27 is suppressed, and by making this light incident on the light guide plate 22, variations in the chromaticity distribution of the light emitted from the emission surface 24 can be suppressed.

  When four blue LED chips 33 are used, a white light source is obtained by mixing yellow light generated by wavelength conversion by the phosphor and blue light transmitted without wavelength conversion by the phosphor, but there is almost no red wavelength component. Therefore, there is a problem that the red component of the original cannot be read well. In the present embodiment, at least one LED chip 33 is configured to emit light of a different color from the other LED chips 33. For example, three of the four LED chips 33 are InGaN-based blue LED chips 33, and the remaining one is an InGaAlP-based (GaAs substrate 30) red LED. Thus, it is possible to realize the emission device 21 that functions as a linear light source for an image sensor having excellent color reproducibility. Further, instead of using a red LED to emit red light, a phosphor that emits yellow light by absorbing blue light by using the LED chip 33 that emits light of the same color to each other, for example, with Ce An active YAG phosphor and a phosphor that absorbs blue light and emits red light, such as Eu-activated nitride phosphor, may be used in combination. By combining the phosphors in this way, it is possible to realize the emission device 21 that functions as a linear light source for an image sensor having excellent color reproducibility.

  The reflector 32 has light reflectivity, is provided apart from the sealing body 31 and surrounds the sealing body 31, reflects light emitted from the light source 27 through the sealing body 31, and guides the light. The light is guided to the incident surface 23 of the optical plate 22. The reflector 32 has a slope 38 that increases in diameter as it goes in the emission direction of the light source 27. In other words, the reflector 32 is provided on the main surface 34 so as to be separated from the outside of the sealing body 31 and surrounded by the inclined surface 38. As the shape of the opening of the reflector 32, a shape in which light efficiently enters the light guide plate 22, for example, an opening angle is selected. The shape of the reflector 32 is selected so that the incident area of the light from the light source 27 on the incident surface 23 is made smaller than the incident surface 23. The size of the opening of the reflector 32 is set so as to be completely covered by the incident end face of the light guide plate 22. The lower portion of the reflector 32 is a bottom surface 25 opening 29, and the main surface 34 and the metal pad portion 36 are exposed inside the bottom surface 25 opening 29. In the reflector 32, the upper surface opening 29 is formed in a flat plate shape. As described above, the surface of the reflector 32 is flattened, so that it can be brought close to or in close contact with the incident surface 23 of the light guide plate 22. As a result, the surface inside the opening of the emission device 21 can be made as highly reflective as possible, and the light reflected by the incident surface 23 is also reflected by the inner surface of the opening and finally enters the light guide plate 22. It is possible to increase the light use efficiency. Further, the radiation characteristic can be determined by the shape of the opening 29 of the reflector 32, and the incidence efficiency to the light guide plate 22 can be increased by narrowing the radiation region.

  The reflector 32 is required to have a surface and a surface having a high reflectivity with respect to the color of the light source 27 such as the slope 38. When the light source 27 is white, a white resin having a high reflectance with respect to the entire visible light, or a metal such as aluminum and silver is preferable. The white resin is preferably a polyamide-based resin containing titanium oxide powder. Alternatively, a reflector 32 may be used in which a metal layer having a high reflectance with respect to the color of the light source 27 is plated on the surface of a reflector body made of ordinary resin to form a plating layer. When a plating layer is provided on a reflector body made of a white resin, it is desirable that the metal to be plated has a high reflectance over the entire visible light region, and aluminum and silver are preferable. In order to plate aluminum and silver on the reflector body made of resin or ceramic, it is peeled off by depositing refractory metal Ti, W, Mo or their eutectic alloy as an underlayer on the surface to be plated. A good plating layer with no slag is obtained. Further, since the surface of aluminum and silver is likely to be oxidized, it is desirable to deposit a dielectric layer made of a dielectric as a protective film on the surface of the plating layer to cover the surface of the plating layer. In order to prevent reflection by the dielectric layer over the entire visible light, it is desirable that the thickness of the film be sufficiently thin with respect to blue light (wavelength λ) having the shortest wavelength among visible light. That is, the thickness of the dielectric layer is desirably λ / (4n) or less. Here, n represents the refractive index of the dielectric with respect to light having the wavelength λ.

  As a method for fixing the reflector 32 and the substrate 30. For example, an adhesive is used. In addition, in order to fix more securely, the board 30 and the reflector 32 are each provided with a fitting recess and a fitting protrusion, and the fitting protrusion is fitted into the fitting recess and fixed. Also good. Further, by providing a recess in the center of the main surface 34, mounting the LED chip 33 in the recess, and providing the sealing body 31 in the recess, the amount of resin constituting the sealing body 31 can be reduced. In the case of providing such a recess, the metal wire 37 for connecting to the electrode of the LED chip 33 is provided between the electrode of the LED chip 33 and the wiring provided on the main surface 34 outside the recess.

  FIG. 6 is a plan view showing an example of the reflector 32. As shown in FIG. 6, the shape of the opening 29 of the reflector 32 is not limited to a circle as shown in FIG. 5 and FIG. 6 (a), but an ellipse as shown in FIG. 6 (b), and FIG. 6 (c). Or the like, and may be appropriately designed according to the shape of the incident surface 23 of the light guide plate 22 and the light guide characteristics.

  Next, the radiation characteristics of the emission device 21 will be described. FIG. 7 is a cross-sectional view showing a part of the emission device 21 in an enlarged and simplified manner. When it can be considered that the light emitting area of the light source 27 is sufficiently small as in the LED chip 33, the radiation characteristic of the light source 27 has the highest light intensity vertically upward from the upper surface. The intensity decreases almost in proportion to the fourth power of. This vertically upward direction is the optical axis L1 of the light source 27. The angle θ at which the light intensity is halved is a half-width at half maximum, and the angle formed by the two directions at which the intensity is halved with respect to the maximum intensity without specifying the optical axis L1 is the full width at half maximum. When the radiation characteristics are equal on both sides of the optical axis, the center of the two directions is the optical axis L1. When the radiation characteristic of the light source 27 is expressed, it is often expressed only by the full width at half maximum. In the emission device 21 in which the sealing body 31 is separated from the reflector 32, the light emitted from the sealing body 31 exhibits the same behavior as the light emitted from the LED chip 33, and has the radiation characteristics. Therefore, the light emitted at an angle larger than θ shown in FIG. 7 is reflected by the reflector 32 and emitted in the optical axis direction of the light source 27. Thereby, the radiation characteristic can be easily adjusted by the angle φ of the reflector 32.

  Such an effect is obtained when the sealing body 31 is provided at a position sufficiently lower than the opening 29 of the reflector 32. However, the most significant effect is obtained when the entire reflector 32 is separated from the sealing body 31. Needless to say. If the inclined surface 38 of the reflector 32 is steep, in other words, if the angle φ is reduced, it becomes difficult to remove the mold after the reflector 32 is molded. Further, it becomes difficult to increase the reflectivity by applying vapor deposition and plating to the reflector 32 that makes the slope 38 of the reflector 32 steep. Therefore, since the radiation characteristic cannot be completely controlled only by the shape of the reflector 32, the shape of the reflector 32 is determined together with the shape of the sealing body 31.

  As described above, in the illumination device 20 according to the present embodiment, in order to obtain the linear light source 27 with a large light amount, a plurality of LED chips 33 are arranged on the emission device 21 so as to be independent convex portions. A plurality of LED chips 33 are sealed using a sealing body 31 including a light scattering material, and a reflector 32 is provided on the substrate 30 so as to isolate the outside of the sealing body 31 and surround the slope 38. The light emitting device 21 is disposed at one end of the light guide plate 22 to form a linear light source 27. Therefore, the light emitted from each LED chip 33 is guided to the incident surface 23 of the light guide plate 22 by the reflector 32. The light guided to the incident surface 23 is guided by the light guide plate 22 and emitted from the emission surface 24. By providing the reflector 32 apart from the sealing body 31, the light coupling efficiency between the emission device 21 and the light guide plate 22 can be increased for the light emitted from the sealing body 31. In other words, since the emitting device 21 includes the reflector 32 separated from the LED chip 33 and the sealing resin, the incident angle of light to the light guide plate 22 is limited by the reflector 32, and the vicinity of the incident position of the light guide plate 22. Thus, light leaking from the light guide plate 22 can be eliminated, and the amount of light emitted from the light guide plate 22 can be increased. By using such an illuminating device 20, it is possible to irradiate the object with light with suitable brightness. Accordingly, it is possible to realize the linear light source 27 using the LED having a large light amount for the scanner using the reduction optical system without using an environmental pollutant such as Hg.

  Further, by integrally sealing a plurality of LED chips 33 with a sealing body 31 containing a light scattering material, it is possible to equalize the wavelength variation between the LEDs and to make light incident on the light guide plate 22. Variations in the chromaticity distribution in the emitted linear light source can be suppressed. Further, when the phosphor is used as the light scattering material, the wavelength conversion of each LED is performed with the phosphor having the same component thickness, so that the emission color with no chromaticity variation is obtained and the same effect as described above is obtained.

  Next, a second embodiment of the present invention will be described. FIG. 8 is a front view showing a lighting device 20a according to the second embodiment of the present invention. FIG. 9 is a plan view showing the lighting device 20a. FIG. 10 is a side view showing the lighting device 20a. FIG. 11 is an enlarged front view showing a part of the lighting device 20a. In the illumination device 20a of the present embodiment, not only the emission device 21 of the first embodiment described above is used, but the light capturing efficiency is further improved by providing the convex portion 39 on the incident surface 23 of the light guide plate 22. Characterized by points.

  The shape of the convex portion 39 is matched to the opening shape of the reflector 32 of the emitting device 21. When the opening portion 29 is circular, it is conical or spherical, and when it is rectangular, it is a pyramid shape. The convex portion 39 (hereinafter also referred to as “incident convex portion”) 39 of the incident surface 23 is formed in a pyramid shape or a conical shape. The apex angle θ1 of the incident convex portion 39 is configured to be larger than twice the opening angle φ1 of the reflector 32. Further, the width dimension T1 of the bottom portion of the incident convex portion 39 is configured to be larger than the width dimension T2 of the end portion facing the incident surface 23 of the reflector 32. The apex 40 of the incident convex portion 39 is a position that does not contact the sealing body 31 and is disposed closer to the light source 27 than the opening 29 that is the end portion 29 facing the incident surface 23 of the reflector 32. An end 29 facing the incident surface 23 of the reflector 32 and the incident surface 23 are provided in close contact with each other. In the present embodiment, the incident convex portion 39 is disposed so as to be in contact with the inclined surface 38 of the reflector 32. As described above, when the opening ridge line of the output device 21 is disposed so as to be in close contact with the side wall of the incident convex portion 39 which is a part of the incident surface 23, the light reflected by the incident surface 23 is also a surface of the reflector 32 or the like of the output device 21. Since the light is reflected again and finally enters the light guide plate 22, light leakage can be minimized.

  In order to prevent light from leaking, it is sufficient to make the incident convex portion 39 completely enter the reflector 32 as T1 <T2, and the remaining incident surface 23 and the end portion of the reflector 32 are brought into contact with each other. If T1 = T2, the portion that is not the incident convex portion 39 also enters the inside of the emitting device 21, and the coupling efficiency is lowered. Since the effect of the incident convex portion 39 becomes more prominent as the radiation angle θ is larger, the presence or absence of the incident convex portion 39 does not significantly affect the light whose radiation angle θ is close to zero. As in the present embodiment, when T1> T2, the surface of the opening 29 of the light emitting device is in contact with the side surface 28 of the incident convex portion 39, and the entire incident surface 23 is configured by the incident convex portion 39.

  The incident convex portion 39 can be integrally molded so that the upper mold, the lower mold, and the joint surface become the apex 40 of the incident convex portion 39 when the light guide plate 22 is molded. The incident convex portion 39 has an apex 40 that decreases the opening angle φ1 to the inside of the reflector 32 of the output device 21, so that the angle of the light incident on the light guide plate 22 increases, and the incident light is all near the incident surface 23. Reflection increases and it becomes easier to confine in the light guide plate 22.

  FIG. 12 is a view showing another example of the illumination device 20a and is a front view showing a part thereof enlarged. Depending on the dimensional relationship between the reflector 32 and the incident convex portion 39, if the incident convex portion 39 has a conical apex 40 or the like, the tip portion 39a may abut against the sealing body 31. As shown in FIG. 12, the tip end portion 39a of the incident convex portion 39 may be cut and flattened.

  Further, the present embodiment is configured to include two emission devices 21. The other emitting device 21a is provided on the opposite surface 26 facing the incident surface 23, and the opposite surface 26 is also configured to function as the incident surface. As a result, the light guide plate 22 is relatively long, and the amount of light is insufficient with respect to the length of the light guide plate 22 only by the light from one emission device 21 as in the illumination device 20a of the first embodiment described above. Even if it is a case, desired light quantity can be entered into the light-guide plate 22 by providing the output device 21a in the other.

  As described above, in the present embodiment, the incident surface 23 has the convex portion 39 that is convex toward the reflector 32, so that the incident light incident on the incident surface 23 is provided by providing the incident convex portion 39. The angle can be increased, and the light incident on the light guide plate 22 from the incident surface 23 can be confined. As a result, the amount of light emitted from the emission surface 24 can be increased.

  Next, a third embodiment of the present invention will be described. FIG. 13: is a front view which shows the illuminating device 20b of the 3rd Embodiment of this invention. The illumination device 20b according to the present embodiment is similar to the illumination device 20 according to the first embodiment described above, and the diameter of the incident surface 23 is increased toward the one side in the radial direction Z with respect to the optical axis direction X. Thus, it is characterized in that it is formed in a tapered shape. In other words, the incident surface 23 is provided to be inclined so as to face the exit surface 24. The emission device 21 is provided on the incident surface 23 in the same manner as in the above-described embodiments.

  By inclining the incident surface 23 in this manner, the optical axis of incident light is directed toward the bottom surface 25, and the light can be quickly reflected from the bottom surface 25 and extracted from the emission surface 24. Such a configuration is effective when the light guide plate 22 is short and when the emission device 21 is provided not only on the incident surface 23 but also on the opposite side.

  Next, a fourth embodiment of the present invention will be described. FIG. 14 is a front view showing an illumination device 20c according to the fourth embodiment of the present invention. The illumination device 20c of the present embodiment is similar to the illumination device 20a of the second embodiment described above, and the incident convex portion 39 is provided so that the axis L2 of the incident convex portion 39 intersects the bottom surface 25. . Therefore, the shape of the incident convex portion 39 is asymmetric with respect to the optical axis direction X.

  Thus, the surface 23 of the incident convex portion 39 can be inclined with respect to the optical axis direction X by configuring the axis L2 of the incident convex portion 39 on the bottom surface 25. As a result, the optical axis L3 of the incident light is directed toward the bottom surface 25, and the light can be quickly reflected from the bottom surface 25 and extracted from the emission surface 24. Such a configuration is effective when the light guide plate 22 is short and when the emission device 21 is provided not only on the incident surface 23 but also on the opposite side.

  Next, a fifth embodiment of the present invention will be described. FIG. 15: is a front view which shows the illuminating device 20d of the 5th Embodiment of this invention. The illuminating device 20d of the present embodiment is similar to the illuminating device 20 of the first embodiment described above, and the end portion 29 facing the incident surface 23 of the reflector 32 and the incident surface 23 are provided in close contact with each other. It is characterized in that

  As described above, the end portion 29 facing the incident surface 23 of the reflector 32 and the incident surface 23 are provided in close contact with each other, so that light reflected by the reflector 32 leaks from between the reflector 32 and the incident surface 23. It is possible to prevent incidents and to make sure that they are incident. Further, it is not necessary for the entire surface of the emission device 21 to be in close contact with the incident surface 23, and at least only the opening 29 of the reflector 32 may be in close contact.

It is a front view which shows the illuminating device 20 of the 1st Embodiment of this invention. It is a top view which shows the illuminating device 20. FIG. It is a side view which shows the illuminating device 20. FIG. 3 is a perspective view showing an emission device 21. FIG. 3 is a plan view showing an emission device 21. FIG. 4 is a plan view showing an example of a reflector 32. FIG. It is sectional drawing which expands and shows a part of radiation | emission apparatus 21 in a simplified manner. It is a front view which shows the illuminating device 20a of the 2nd Embodiment of this invention. It is a top view which shows the illuminating device 20a. It is a side view which shows the illuminating device 20a. It is a front view which expands and shows a part of illuminating device 20a. It is a figure which shows the other example of the illuminating device 20a, Comprising: It is a front view which expands and shows a part. It is a front view which shows the illuminating device 20b of the 3rd Embodiment of this invention. It is a front view which shows the illuminating device 20c of the 4th Embodiment of this invention. It is a front view which shows the illuminating device 20d of the 5th Embodiment of this invention. It is a front view which shows an example of the LED package 1 of a prior art. It is a perspective view which shows the other example of the LED package 2 of a prior art. It is sectional drawing which shows the LED apparatus 8 of the 3rd prior art. It is sectional drawing which shows LED device 8a which removed sealing resin from the LED device of the 3rd prior art.

Explanation of symbols

20, 20a, 20b, 20c, 20d Illuminating device 21 Emitting device 22 Light guide plate 23 Incident surface 24 Ejecting surface 25 Bottom surface 27 Light source 29 Opening portion 30 Substrate 31 Sealing body 32 Reflector 33 LED chip 38 Slope 39 Incident convex portion

Claims (24)

An illuminating device comprising: an emitting unit that emits light; and a light-transmitting unit that has translucency and has an incident surface on which light emitted from the emitting unit is incident and a light guide unit that is substantially perpendicular to the incident surface. And
The emitting means includes
A light source;
A mounting table on which the light source is mounted;
A sealing body that has translucency, covers the outer periphery of the light source, and integrally seals the light source on the mounting table;
A reflector having light reflectivity, provided apart from the sealing body, surrounding the sealing body, and reflecting light emitted from the light source via the sealing body to the incident surface;
The light guiding means includes
A bottom surface that is continuous with the entrance surface and faces the exit surface;
The incident surface, the emission surface and the bottom surface, and having two side surfaces facing each other,
The two side surfaces are formed in a tapered shape so as to be separated from each other toward the exit surface from the bottom surface,
The said sealing body contains the light-scattering agent which enlarges the output area of the light radiate | emitted from a light source, The illuminating device characterized by the above-mentioned. An illuminating device comprising: an emitting unit that emits light; and a light-transmitting unit that has translucency and has an incident surface on which light emitted from the emitting unit is incident and a light guide unit that is substantially perpendicular to the incident surface. And
The emitting means includes
A light source;
A mounting table on which the light source is mounted;
A sealing body that has translucency, covers the outer periphery of the light source, and integrally seals the light source on the mounting table;
A reflector having light reflectivity, provided to surround the sealing body and spaced from the sealing body, and reflects light emitted from the light source through the sealing body to guide the incident surface, An incident area of light from the light source on the incident surface includes a reflector that makes the incident area smaller than the incident surface;
The light guiding means includes
A bottom surface that is continuous with the entrance surface and faces the exit surface;
The incident surface, the emission surface and the bottom surface, and having two side surfaces facing each other,
The two side surfaces are formed in a tapered shape so as to be separated from each other toward the exit surface from the bottom surface,
The said sealing body contains the light-scattering agent which enlarges the output area of the light radiate | emitted from a light source, The illuminating device characterized by the above-mentioned.   3. The lighting device according to claim 1, wherein a bottom surface of the light guide unit facing the emission surface has at least one of light reflectivity and light diffusibility.   The lighting device according to any one of claims 1 to 3, wherein the reflector has an inclined surface whose diameter increases as it goes in the emission direction of the light source.   The lighting device according to claim 1, wherein an end facing the incident surface of the reflector and the incident surface are provided in close contact with each other.   The illumination device according to claim 1, wherein the incident surface has a convex portion that is convex toward the reflector.   The lighting device according to claim 6, wherein the convex portion has a pyramid shape or a conical shape.   The lighting device according to claim 7, wherein an apex angle of the convex portion is larger than an opening angle of the reflector.   The lighting device according to claim 8, wherein a width dimension of a bottom portion of the convex portion is larger than a width dimension of an end portion facing the incident surface of the reflector.   The lighting device according to any one of claims 7 to 9, wherein the axis of the convex portion intersects a bottom surface facing the light exit surface of the light guide means.   The lighting device according to any one of claims 6 to 10, wherein a vertex of the convex portion is disposed on a light source side from an end portion facing an incident surface of the reflector.   The lighting device according to claim 11, wherein the convex portion is disposed so as to be in contact with an inclined surface of the reflector.   The lighting device according to claim 11, wherein a tip portion of the convex portion is formed in a flat shape.   The lighting device according to claim 1, wherein the reflector is white. The reflector is
A reflector body made of resin;
The lighting device according to claim 1, further comprising: a plating layer that covers a surface of the reflector body and is made of silver or aluminum. The reflector is
A reflector body made of resin;
Covering the surface of the reflector body, and an underlayer made of Mo (molybdenum), W (tungsten), Ti (titanium) or their eutectic metal;
The lighting device according to claim 1, further comprising: a plating layer that covers a surface of the base layer and is made of silver or aluminum.   The lighting device according to claim 15, wherein the reflector further includes a dielectric layer that covers a surface of the plating layer and is made of a dielectric.   The lighting device according to claim 1, wherein the reflector is made of metal.   The lighting device according to claim 1, wherein the light scattering agent is a phosphor that absorbs a wavelength of light emitted from a light source and converts the light into light having a longer wavelength.   The lighting device according to claim 1, wherein the light scattering agent is a light-transmitting fine particle.   The lighting device according to claim 1, wherein the sealing body is formed in a lens shape having an optical axis substantially the same as a light emission axis of a light source.   The lighting device according to claim 1, wherein the light source includes a plurality of light emitting diodes. The light source includes a plurality of light emitting diodes,
The lighting device according to claim 19, wherein each of the light emitting diodes emits light of the same color. The light source includes a plurality of light emitting diodes,
The lighting device according to claim 19, wherein at least one of the light emitting diodes emits light having a color different from that of the other light emitting diodes.

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