JP2009016087A - Light guide member, illuminating device using the light guide member, and light guiding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide member which easily enables downsizing of the whole member (device) since the light guide member which can make light emit from the whole face in an emitting direction can be achieved and its large-sizing to obtain a light-emitting face (outgoing part) of a desired size is not necessary, to provide a light source device using the light guide member, to provide an illuminating device using the light guide member, and to provide a light guiding method using the light guide member. <P>SOLUTION: The light guide member has a molding part 12a which totally reflects light emitted from a light source 2 by guiding the light from the incident part 11 and which further reflects the totally reflected light on a reflecting face and emits it. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light guide member that enters and guides light from a light source from an incident portion and emits light from an output portion, a light source device using the light guide member, an illumination device using the light guide member, and the The present invention relates to a light guide method using a light guide member, for example, a light guide member suitable for use in a backlight of a liquid crystal display, a streetlight, a lighting device such as a home or factory, a light source device using the light guide member, and the light guide member And a light guide method using the light guide member.

  In recent years, devices using light sources such as LEDs (Light Emitting Diodes) and CCFLs (Cold Cathode Fluorescent Lamps) have been proposed that use a light guide plate to make the light from the light sources uniform and to irradiate the surface. (For example, refer to Patent Document 1).

In Patent Document 1, as shown in FIG. 18, a reflecting surface C having a critical angle for directing a light beam guided from the light emitting element A to the first light incident surface B1 toward the light emitting surface B2, At least one shape part B3 formed from a light exit surface D that emits the light beam reflected by the reflection surface C and a second light incident surface F that guides the light beam emitted from the light exit surface D is provided. A surface light emitting device including a light guide plate B provided is described.
JP 2002-222605 A

  However, in the light guide plate (light guide member) B of the surface light emitting device described in Patent Document 1, the shape portion B3 only has a function of guiding light from the light emitting element A into the light guide member B. Therefore, light could not be emitted from the shape portion B3, and therefore, the entire surface including the shape portion B3, that is, the shape portion B3 and the emission surface B2 could not emit light. Therefore, in order to obtain a light emitting surface of a desired size, the light emitting surface must be configured with a size excluding the shape portion B3, which inevitably increases the size of the entire apparatus.

  The present invention has been made in order to solve the above-described problems, and is formed so that light can be emitted even in a molded portion (a portion corresponding to a conventional shape portion), and can be emitted over the entire surface in the emission direction. An object of the present invention is to provide a light guide member, a light source device using the light guide member, an illumination device using the light guide member, and a light guide method using the light guide member.

  The light guide member of the present invention is characterized by comprising a molding part that guides the light from the light source from the incident part and totally reflects it, and further reflects the totally reflected light on the reflecting surface and emits it. And

  In the light guide member of the present invention, it is possible to realize a light guide member that can emit light over the entire surface in the emission direction.

  In the light guide method using the light guide member of the present invention, the light from the light source is guided from the incident portion and totally reflected by the forming portion, and the totally reflected light is reflected by the reflecting portion, and the forming is performed. It is made to radiate | emit from a part.

  In the light guide method using the light guide member of the present invention, a light guide capable of emitting light over the entire surface in the emission direction can be realized.

  According to the light guide member of the present invention or the light guide method using the light guide member, since the molding part can emit light, it is possible to realize a light guide member that can emit the emitted light over the entire surface in the emission direction. Therefore, it is not necessary to increase the size of the entire member (device) in order to obtain a light emitting surface (light emitting portion) having a desired size, and the size can be easily reduced. In addition, the light source device or the illumination device can be easily downsized by using the light guide member of the present invention or the light guide method using the light guide member.

(Embodiment 1)
Hereinafter, embodiments of the light guide member of the present invention will be described with reference to FIGS. 1 to 4.

  As shown in FIGS. 1 and 2, the light guide member 1 of the present invention applies light from the light source 2 to a light guide member body 10 made of a transparent or translucent resin material such as acrylic, polycarbonate, epoxy, or cycloolefin. An incident portion 11 is provided, and the light incident from the incident portion 11 is guided and totally reflected, and the totally reflected light is further reflected by the first reflecting portion 13 and / or the first reflecting portion serving as a reflecting surface. (2) A curved surface portion 12a is provided as a molding portion that reflects the light reflected by the reflective portion 14 and emits the light reflected by the reflective portion, and the light reflected by the curved surface portion 12a is further reflected by the first reflective portion. 13 and / or a flat surface portion 12b that is reflected and emitted by the second reflecting portion 14, and the curved surface portion 12a and the flat surface portion 12b are provided with the light emitting portion 12.

  In the above case, the first reflecting portion 13 shows a state (vertical state) that is not inclined with respect to the thickness direction z, and hereinafter, the first reflecting portion 13 in such a state is indicated by reference numeral 13a. In addition, the second reflecting portion 14 shows a state having an inclination with respect to the width direction (short direction) x, and hereinafter, the second reflecting portion 14 in such a state is denoted by reference numeral 14b.

  In the above configuration, the light source 2 includes a plurality of LED chips 21, and the plurality of LED chips 21 are arranged in a row at a predetermined interval on an elongated LED substrate 22. Thus, the light guide member 1 is disposed so as to contact the incident portion 11.

  Further, the incident portion 11 is provided in an elongated shape in the longitudinal direction y on one end side 10b of one surface (bottom surface) 10a of the light guide member main body 10, and has a predetermined shape on the elongated LED substrate 22 of the light source 2. A plurality of LED chips 21 arranged in a line at intervals are configured to contact each other.

  The emitting portion 12 extends to the curved surface portion 12a and the curved surface portion 12a, which is a molded portion having a shape for totally reflecting the light guided from the incident portion 11 into the light guide member body 10. The flat portion 12b is configured as described above.

  The curved surface portion 12a is located on one side surface (light source side surface) 15 of the light guide member body 10, and is provided so as to connect (connect) the incident portion 11 and the planar portion 12b. Further, the curved surface portion 12a (the curved surface of the curved surface portion 12a) is guided from the incident portion 11 into the light guide member body 10, and the incident angle causes total reflection with respect to the light incident on the curved surface portion 12a. The light is incident on the curved surface portion 12a so as to be totally reflected from the incident portion 11 into the light guide member body 10, and from a direction other than the incident portion 11. Since the light whose incident angle does not exceed the critical angle is included, the light whose incident angle does not exceed the critical angle is configured to be emitted outside the light guide member body 10 even in the curved surface portion 12. It will be.

  The first reflecting portion 13a is provided on a side surface on the side far from the incident portion 11 (on the side opposite to the connection side between the incident portion 11 and the planar portion 12b). Reflection function for reflecting the light guided to the inside of the light guide member main body 10, in particular, the light totally reflected by the curved surface portion 12 a is reflected to the emitting portion 12 composed of the curved surface portion 12 a and the flat surface portion 12 b. It has a function to make it.

  The second reflecting portion 14b is provided adjacent to the incident portion 11 and the first reflecting portion 13a at a position facing the emitting portion 12, and the curved surface is similar to the first reflecting portion 13a. It has a function of reflecting the light totally reflected by the portion 12a to the emitting portion 12 composed of the curved surface portion 12a and the flat surface portion 12b. Further, the second reflecting portion 14b is provided with an inclination so that the thickness z in the width direction x of the light guide member body 10 increases for a while as the light source 2 is approached. In this case, the effect of increasing the light reflected in the direction of the curved surface portion 12a can be provided.

  The first reflecting portion 13a and the second reflecting portion 14b are provided with a reflecting function by, for example, dot printing processing for printing ink having a reflecting effect in a dot shape, or vapor deposition of a metal such as aluminum or silver. It has been done.

  Next, in the light guide member 1 of the present invention configured as described above, the light emitted from the light source 2 is guided from the incident portion 11 of the light guide member body 10 into the light guide member body 10. The light guide operation until the light is emitted from the emission part 12 will be described.

  First, the light emitted from the light source 2 is incident from the incident portion 11 of the light guide member body 10 with which the light source 2 abuts, and the incident light is refracted by a difference in refractive index while the light guide member. The light is guided into the main body 10.

  The light guided to the inside of the light guide member main body 10 is directed (advanced) toward the curved surface portion 12a facing the incident portion 11, and the light guided by the curved surface portion 12a is totally reflected, The totally reflected light is further reflected by the first reflecting portion 13a and / or the second reflecting portion 14b, and the reflected light is emitted from the curved surface portion 12a and also emitted from the flat surface portion 12b. Then, the light is emitted from the entire surface of the emission part 12.

  Therefore, a light guide member that can emit the emitted light over the entire surface in the emission direction w1 or a light guide method using the light guide member can be realized. Therefore, in order to obtain a light emitting surface of a desired size, the entire member is large. Therefore, it is possible to easily reduce the size.

  Next, the magnitude | size of the said light guide member 1 is demonstrated using the code | symbol a to the code | symbol f described in FIG.

  In addition, the code | symbol a shows the intersection of the said incident part 11 and the 2nd reflection part 14b, the code | symbol b shows the intersection of the said incident part 11 and the curved surface part 12a, and the code | symbol c shows the said curved surface part 12a and the plane part 12b. The symbol d indicates the intersection between the flat surface portion 12b and the first reflecting portion 13a, and the symbol e indicates the intersection between the first reflecting portion 13a and the second reflecting portion 14b.

  The symbol f indicates the intersection of the extension line h of the first reflecting portion 13 a and the extension line i of the incident portion 11.

  The size of the light guide member 1 will be described using the above symbols a to f. For example, the size of the light guide member 1 is, for example, the dimension in the width direction x (the symbols b and f in FIG. 1). The distance in the longitudinal direction y is 19 mm, the dimension in the thickness direction z (the distance between the symbol d and the symbol f in FIG. 1) is 9 mm, and the dimension in the longitudinal direction y is arbitrary. The dimension of the incident portion 11 in the width direction x (the distance between the reference symbol “a” and the reference symbol “b” in FIG. 1) is 2 mm.

  Further, the inclination given to the second reflecting portion 14 is such that the dimension in the width direction x (the distance between the symbol a and the symbol f in FIG. 1) is 17 mm, whereas the dimension in the thickness direction z (in FIG. 1). The inclination angle β (about 8.4 °) with the distance between the reference symbol e and the reference symbol f) being 2.5 mm, and the thickness of the light guide member 1 decreases as the distance from the incident portion 11 increases. It was decided to be inclined.

  Next, the shape and function of the curved surface portion 12a of the light guide member 1 in the above case will be described in more detail.

  As shown in FIG. 3, the curved surface portion 12a has a curved surface shape such that the incident angle exceeds the critical angle with respect to all the light incident from the incident portion 11 into the light guide member main body 10, It is configured to totally reflect light.

  This critical angle will be explained in more detail. The critical angle in this case means that when light passes between substances having different refractive indexes, it tries to pass from a substance having a high refractive index to a substance having a low refractive index. When the incident angle exceeds a certain angle, it is an angle that causes a phenomenon of total reflection in which all light is reflected without causing refraction.

  In general, reflection using a reflective material or a reflection sheet causes a so-called reflection loss in which energy is lost between incident light and reflected light. However, in the case of the total reflection described above, there is no such reflection loss, and light is efficiently reflected. The route can be changed.

  In Embodiment 1 of the present invention, the shape of the curved surface portion 12a has a shape represented by an equiangular spiral with the light guide member 1 cut along a plane perpendicular to the longitudinal direction y. The equiangular spiral at this time is a curve that draws a spiral having a characteristic that the angle between the tangent of the curve at the point P and the line segment OP is always equal, where O is the origin and P is any point on the curve. It is.

  Accordingly, the condition for the total reflection of the light emitted from the LED chip 21 of the light source 2 is the minimum as the angle condition in which the angle between the LED chip 21 and an arbitrary point on the curve always causes the total reflection. It is designed to be as close to the critical angle as possible in the angle condition where the total reflection is the same as the critical angle, which is the incident angle, and the optimum shape to meet this condition is as described above. The light guide member 1 can be formed to be the thinnest by adopting the shape using the equiangular spiral having the characteristics.

  Note that the shape of the curved surface portion 12a shown in FIG. 3 is a schematic shape, and more precisely, has a shape determined by the following mathematical formula.

Here, the equiangular spiral will be described in more detail. The equiangular spiral has C as a constant, n ₀ as a refractive index of the light guide member 1, and 0 <α ≦ π / 2−sin ⁻¹ (1 / Assuming a constant angle α satisfying (n ₀ ), it can be expressed as r = exp (−θ / tan α + C) in polar coordinate display with a radius r and an angle θ with one point of the incident portion as the origin.

Then, the cross-sectional shape of the curved surface portion 12a adopting the shape using the equiangular spiral is a polar coordinate display (r, r) with one point of the incident portion 11 of the light guide member 1 as the origin O as shown in FIG. θ) r = exp (−θ / tan α + C) (1)
(1) It has the form represented by Formula.

Here, C is a constant, and α is the refractive index of the light guide member 1 is n ₀ .
α ₀ = π / 2−sin ⁻¹ (1 / n ₀ ) (2)
0 <α ≦ α ₀ ……………………………………………………………………………………………………………… (3)
Is an arbitrary value. Here, in the above equations (2) and (3), α ₀ is the maximum value that α can take.

  In the above equation (1), r = exp (−θ / tan α) where C = 0 is defined as a straight line connecting the origin O and an arbitrary point P on the curved surface portion 12a, and a tangent at the point P. Is a function whose angle is always α.

When the critical angle of the light guide member 1 is φ, φ = sin ⁻¹ (1 / n ₀ ) (4)
Therefore, the expression (3) is 0 <α ≦ π / 2−φ ………………………………………………………………………… (5)
Thus, it can be seen that the light from the origin O is incident on the curved surface portion 12a at an incident angle greater than the critical angle, that is, the light incident from the origin O is totally reflected.

In FIG. 3, the curved surface portion 12a has a shape according to the formula (1) in the range of α ≦ θ ≦ π / 2 + α, and is connected to the flat surface portion 12b at the point of θ = α, and θ = π / 2 + α. The point is connected to a plane perpendicular to the incident part 11. For example, if n ₀ = 1.49 and the refractive index of air is 1, the critical angle φ is about 42 °.

  The origin O of the equiangular spiral is set at the end 11a closest to the second reflecting portion 14b in the light emitting region of the light source 2, that is, the end 11a of the incident portion 11 on the first reflecting portion 13a side. It is preferable. By setting the end portion 11a, the total reflection condition can be ensured for all the light guided from the light source 2 and incident on the curved surface portion 12a.

  Furthermore, it is preferable that the curved surface portion 12a exists only in a range where θ in the polar coordinate display of the cross-sectional shape satisfies α ≦ θ ≦ π / 2 + α. More specifically, the light guide member 1 is located with respect to the incident portion 11. It is preferable that the curved surface portion 12a has a vertical surface and is continuous with the vertical surface at a position where θ in the polar coordinate display of the cross-sectional shape is θ = π / 2 + α.

  Further, it is preferable that the curved surface portion 12a is continuous to the flat surface portion 12b at a position where θ in the polar coordinate display of the cross-sectional shape becomes θ = α. Therefore, it is possible to smoothly connect to the adjacent surface from the curved surface portion 12a.

  By forming the curved surface portion 12a as described above, the light incident from the incident portion 11 is totally reflected by the curved surface portion 12a, and the first reflecting portion 13a or the second reflecting portion 14b, or the flat surface portion 12b. Head to. In this case, the first optical path 31 is formed by the optical path until the incident light is totally reflected by the curved surface portion 12a.

  Of the totally reflected light, most of the light traveling toward the plane portion 12b satisfies the total reflection condition and is totally reflected by the plane portion 12b, so that the first reflecting portion 13a or the second reflecting portion is reflected. It heads for the reflection part 14b.

  The light incident on the first reflecting portion 13a and the light incident on the second reflecting portion 14b are reflected by the first reflecting portion 13a and the second reflecting portion 14b, and enter the light guide member body 10. And the guided light travels toward the emitting portion 12. Light incident at an angle of incidence below the critical angle φ at the emitting portion 12 is emitted while being refracted by the light guide member 1, and the curved surface portion 12a emits light. In this case, the totally reflected light is further reflected, and the second optical path 32 is formed by the optical path until it is emitted from the emitting unit 12.

  In addition, light incident at an angle of incidence exceeding the critical angle φ in the emission part 12 is totally reflected again, guided to the inside of the light guide member main body 1, and after further reflection, the critical angle φ is given to the emission part 12. When the light is incident again at a lower incident angle, the light is emitted while being refracted from the light emitting portion 12.

  Next, it will be described with reference to FIG. 4 what optical path the light guided by the incident portion 11 follows in the light guide member 1. In FIG. 4, two types of typical optical paths, an optical path M (broken line) and an optical path N (one-dot chain line) are shown.

  First, in the optical path M, when the light incident from the incident part 11 goes to the curved surface part 12a (the optical path indicated by reference numeral M1 in FIG. 4), the curved surface part 12a is from the incident part 11 as described above. Is totally reflected by the curved surface portion 12a, and the totally reflected light is directed to the second reflecting portion 14b (an optical path indicated by symbol M in FIG. 4). Then, after being reflected by the second reflecting portion 14b, it goes to the first reflecting portion 13a (the optical path indicated by reference numeral M3 in FIG. 4), is reflected by the first reflecting portion 13a, and is reflected by the first reflecting portion 13a. Then, the light travels toward the plane portion 12b (the optical path indicated by reference numeral M4 in FIG. 4).

  In this case, the light traveling toward the flat surface portion 12b is totally reflected into the light guide member 1 and incident on the incident portion 11 because the incident angle satisfies the total reflection condition (beyond the critical angle). Heading (optical path indicated by symbol M5 in FIG. 4).

  Further, the light is totally reflected by the incident portion 11 and then travels toward the curved surface portion 12a (an optical path indicated by a symbol M6 in FIG. 4). The light traveling toward the curved surface portion 12a is the curved surface portion 12a, and the light incident from the incident portion 11 is incident at an angle below the critical angle. The light is emitted while being refracted (the optical path indicated by the symbol M7 in FIG. 4).

  Next, the optical path N will be described. The light incident from the incident portion 11 is first directed to the curved surface portion 12a (the optical path indicated by reference numeral N1 in FIG. 4) and totally reflected, similarly to the optical path M. . The totally reflected light travels toward the second reflecting portion 14b (the optical path indicated by reference numeral N2 in FIG. 4), is reflected by the second reflecting portion 14b, and is reflected by the second reflecting portion 14b. Is directed to the plane portion 12b (optical path indicated by reference numeral N3 in FIG. 4). The light traveling toward the plane portion 12b is emitted to the outside of the light guide member 1 while being refracted because the incident angle is lower than the total reflection condition at the plane portion (the optical path indicated by reference numeral N4 in FIG. 4). .

  As described above, the light guide member 1 in which the incident direction w2 of the light guided to the light guide member 1 and the emission direction w1 of the light emitted from the light guide member 1 are the same direction, and the curved surface portion 12a is formed. In the first embodiment, the light source 2 positioned in the incident portion 11 is configured such that the light incident from the incident portion 11 into the light guide member 1 is totally reflected by the curved surface portion 12a. Is not visually recognized from the emission direction w1, so there is no sense of incongruity.

  Furthermore, in the first embodiment described above, the curved surface portion 12a is such that the totally reflected light is reflected by the first reflecting portion 13a and / or the second reflecting portion 14b and emitted from the curved surface portion 12a. The light guide member 1 is emitted from the curved surface portion 12a, is also emitted from the flat surface portion 12b, and is emitted from the entire surface of the emission portion 12. Therefore, the light guide member 1 is entirely exposed to the emission direction w1. Can emit light.

  In addition, the curved surface portion 12a totally reflects the light incident from the incident portion 11, and reflects the totally reflected light by, for example, the first reflecting portion 13a and emits the light from the curved surface portion 12a. Therefore, even if the width of the light guide member 1 is narrow and the light guide distance in one direction is short, a sufficient light guide distance (reciprocating distance between the curved surface portion 12a and the first reflecting portion 13a) can be secured. In addition, it is possible to make the luminance uniform at the emitting portion 12, and when used as, for example, a lighting fixture, glare (glare) can be reliably prevented.

  Note that the light emitted from the flat surface portion 12b is also emitted after being reflected a plurality of times between the curved surface portion 12a and the first reflecting portion 13a in the same manner as described above. Can be made uniform.

  Furthermore, the light incident from the incident part 11 repeats reflection including total reflection inside the light guide member body 10 until it is incident on the emitting part 12 at an incident angle lower than the critical angle (multiple reflection). Not only the light guide distance in the width direction x but also the light guide distance in the longitudinal direction y can be sufficiently long.

  Accordingly, it is possible to make the luminance uniform between the LED chips 21 arranged in the longitudinal direction y. In the first embodiment, for example, even when the arrangement interval of the LED chips 21 is set to 20 mm. The luminance in the longitudinal direction y can be made uniform.

  And as shown in the above-mentioned Embodiment 1, by arranging the LED chip 21 only on one side, compared with the conventional general case where the LED chips are arranged on both sides, the same shape, and When the same size and the same number of LED chips are used, the LED chips 21 can be concentrated on one side, and the interval between the LED chips can be narrowed. Therefore, it is possible to suppress the luminance unevenness at the emitting portion 12 (to achieve uniform luminance).

  Incidentally, if the LED chips are arranged only on one side as in the first embodiment with a conventional arrangement interval when LED chips are arranged on both sides, the number of LED chips can be reduced. In addition, a desired luminance can be obtained at the emitting portion, and the cost can be reduced.

  And the said curved surface part 12a which is a shaping | molding part can aim at thickness reduction and weight reduction, ensuring a required critical angle by making the shape which used the equiangular spiral.

  In the first embodiment of the present invention, the case where the LED chips 21 are arranged on a straight line in a row at a predetermined interval on the LED substrate 22 has been described as an example. It may be arranged in rows or in a staggered manner.

  In addition to the LED chip 21, various types of light sources may be used as the light source 2. For example, a CCFL is used as an elongated planar light source, and the light from the CCFL is incident on the light guide member 1. 11 may be arranged so as to be incident, and a small EL (electroluminescence) may be used as a linear light source or a point light source, and is not limited to the first embodiment.

  When using the EL, for example, an organic EL having the same size as the LED chip 21 shown in the first embodiment of the present invention may be provided and arranged in a line as a point light source. You may arrange | position so that it may inject from the said incident part 11 as an elongate planar light source like CCFL.

  In any case of using any of the light sources, the curved surface portion 12a has a light incident on the incident portion 11 having an incident angle greater than a critical angle according to the size of the light source in the width direction x. The shape of the light guide member 1 that is designed to emit light over the entire surface is designed.

  Furthermore, in Embodiment 1 of the present invention, the shape of the curved surface portion 12a has been described with respect to the shape using the equiangular spiral, but the light from the incident portion 11 has an incident angle greater than or equal to the critical angle. As long as the shape of the curved surface portion 12a can be designed, for example, an elliptic curve may be used, a plurality of planes may be combined, or a single plane may be used, and the embodiment is limited to the first embodiment. Is not to be done.

  In addition, in Embodiment 1 of the present invention, the second reflecting portion 14 is inclined so that the size of the light guide member 1 in the thickness direction z increases as it approaches the light source 2 (incident portion 11). In addition, the case of the second reflecting portion 14b has been described as an example, but the second reflecting portion 14 may be provided in parallel to the planar portion 12b so that the thickness of the light guide member 1 is constant. Well, it is not limited to the first embodiment.

  In addition, when the 1st reflection part 13 is not provided with an inclination (when provided perpendicular to the plane part 12b), and when the 2nd reflection part 14 is also provided with no inclination (provided parallel to the plane part 12b). A large amount of light is emitted from the light source 2 side.

  In this case, the incident angle when light is incident on the flat surface portion 12b is less likely to violate the total reflection condition, so that a large amount of light is totally reflected on the flat surface portion 12b, and after being reflected a plurality of times, The light enters again, and is emitted after breaking the total reflection condition at the curved surface portion 12a.

  And in Embodiment 1 of this invention, in order to give the said 1st reflection part 13a and the 2nd reflection part 14b to a reflective function, it demonstrated using the dot printing process or the vapor deposition process of metals, such as aluminum and silver However, the reflection function may be provided by other processing, for example, a reflection plate may be provided or a reflection sheet may be attached, and is not limited to the first embodiment.

  Further, the first reflecting portion 13a and the second reflecting portion 14b have a reflecting function by different processing, or only one of the first reflecting portion 13a and the second reflecting portion 14b has a reflecting function. However, the present invention is not limited to the first embodiment.

  Moreover, the said 1st reflection part 13a and the 2nd reflection part 14b may use the reflective member which has a diffusivity, for example, MCPET (registered trademark of Furukawa Electric Co., Ltd.) which is a highly diffusive reflective sheet is used. Dot printing that prints ink with diffusion effect in the form of dots, embossing to create uneven patterns on the resin surface, V-groove processing to form V-shaped grooves, and a small triangular prism shape The first reflecting portion 13a and the second reflecting portion 14b may be directly provided with a large number of micro prism processes or a micro lens process having a large number of minute lens shapes, so that diffusibility may be provided. The present invention is not limited to the first embodiment.

  In this case, by using a reflecting member having diffusibility, there is an effect that the light emitted from the emitting portion 12 is made uniform and luminance unevenness is suppressed, and the emission variation in the emitting portion 12 of the light guide member 1 is obtained. Can be alleviated.

  In addition, when making the said 1st reflection part 13a and the 2nd reflection part 14b have a diffusivity, when the grade of a spreading | diffusion is changed with a position, the emitted light can be equalize | homogenized, especially the 2nd reflection part 14 is demonstrated. In the case of changing the degree of diffusion in the case of, for example, by partially embossing the region where the light amount is insufficient, or by changing the density of the microlens processing in the width direction x, Can be obtained, and the effect of reducing luminance unevenness can be obtained.

(Embodiment 2)
Next, another embodiment of the light guide member 1 of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As in the first embodiment, the light guide member 1 of the present invention is provided with an incident portion 11 that makes light from the light source 2 incident on a light guide member body 10 made of a transparent or translucent resin material. The light incident from the light is guided and totally reflected, and the totally reflected light is further reflected by the first reflecting portion 13 and / or the second reflecting portion 14 as a reflecting portion which is a reflecting surface. A curved surface portion 12a is provided as a molding portion that emits the light reflected by the light source, and the light totally reflected by the curved surface portion 12a is reflected by the first reflective portion 13 and / or the second reflective portion 14. Thus, a flat surface portion 12b for emitting light is provided, and the light emitting portion 12 is provided by the curved surface portion 12a and the flat surface portion 12b.

  In the above case, the first reflecting portion 13 is inclined with respect to the thickness direction z. Hereinafter, the first reflecting portion 13 in such a state is denoted by reference numeral 13b, and the second reflecting portion is also shown. Reference numeral 14 denotes a state having no inclination (planar) with respect to the width direction (short direction) x. Hereinafter, the second reflecting portion 14 in such a state is denoted by reference numeral 14a.

  Next, the magnitude | size of the said light guide member 1 is demonstrated using the code | symbol a to the code | symbol g described in FIG.

  In addition, the code | symbol a shows the intersection of the said incident part 11 and the 2nd reflection part 14a, the code | symbol b shows the intersection of the said incident part 11 and the curved surface part 12a, and the code | symbol c shows the said curved surface part 12a and the plane part 12b. The symbol d indicates the intersection between the plane portion 12b and the first reflecting portion 13b, and the symbol e indicates the intersection between the first reflecting portion 13b and the second reflecting portion 14a.

  The symbol g indicates the intersection of the perpendicular line j passing through the plane portion 12b and the extension line k of the second reflecting portion 14a passing through the symbol d which is the intersection point of the plane portion 12b and the first reflecting portion 13b. It is.

  When the above symbols a to f are used, the size of the light guide member 1 is, for example, a dimension in the width direction x (a distance between the symbol b and the symbol f in FIG. 1) is 19 mm and the thickness direction z 1 (the distance between the symbol d and the symbol f in FIG. 1) is 9 mm, the dimension in the longitudinal direction y is 70 mm, and the dimension in the width direction x of the incident portion 11 of the light guide member 1 (FIG. 1) is a distance of 2 mm.

  Furthermore, the inclination given to the first reflecting portion 13b is 9 mm in the dimension in the thickness direction z (the distance between the symbol d and the symbol g in FIG. 5), but the dimension in the width direction x (see FIG. 5). 5 and the inclination angle γ (about 16 °) in which the distance between the reference symbol e and the reference symbol g is 2 mm, and the inclination is inclined toward the inside of the light guide member body 10.

  Next, it will be described with reference to FIG. 5 what optical path the light guided by the incident portion 11 follows in the light guide member 1. FIG. 5 shows two typical optical paths, that is, an optical path S (broken line) and an optical path T (one-dot chain line).

  First, in the optical path S, the light incident from the incident portion 11 is directed toward the curved surface portion 12a (the optical path indicated by reference numeral S1 in FIG. 5), totally reflected by the curved surface portion 12a, and the totally reflected light. Is again directed to the curved surface portion 12a (optical path indicated by reference numeral S2 in FIG. 5), and is totally reflected again, and after being reflected by the first reflecting portion 13b, the second reflecting portion 14a, and the flat surface portion 12b, the curved surface portion 12a. (The optical path indicated by S3 to S5 in FIG. 5).

  The light traveling toward the curved surface portion 12a is the curved surface portion 12a, and the light incident from the incident portion 11 is incident at an angle below the critical angle. The light is emitted while being refracted (the optical path indicated by S6 in FIG. 5).

  Next, the optical path T will be described. As in the optical path S, the light incident from the incident section 11 is first directed to the curved surface section 12a (optical path indicated by reference numeral T1 in FIG. 5) and totally reflected. . The totally reflected light travels toward the second reflecting portion 14a (the optical path indicated by reference numeral T2 in FIG. 5), is reflected by the second reflecting portion 14, and is reflected by the second reflecting portion 14a. Is reflected by the first reflecting portion 13b (the optical path indicated by reference numeral T3 in FIG. 5) and travels toward the flat portion 12b (optical path indicated by reference numeral T3 in FIG. 4). The light traveling toward the flat portion 12b is emitted to the outside of the light guide member 1 while being refracted because the incident angle is lower than the total reflection condition at the flat portion (the optical path indicated by T4 in FIG. 5). .

  As described above, the light incident from the incident portion 11 is emitted from the entire surface of the emission portion 12 including the curved surface portion 12a and the flat surface portion 12b. Therefore, the light guide member 1 is moved in the emission direction w1. The entire surface can be illuminated.

  In the first embodiment of the light guide member of the present invention, the first reflecting portion 13a is parallel to the thickness direction z and the second reflecting portion 14b is inclined with respect to the width direction x. In the second embodiment, the first reflecting portion 13b is inclined with respect to the thickness direction z, and the second reflecting portion 14a is parallel to the width direction x. However, for example, the light guide member may be constituted by the first reflecting portion 13a parallel to the thickness direction z and the second reflecting portion 14a parallel to the width direction, and the thickness direction z The light guide member may be composed of the first reflecting portion 13b having an inclination relative to the second reflecting portion 14b and the second reflecting portion 14b having an inclination with respect to the width direction.

  In any case, the light guide member 1 that emits light over the entire surface can be realized by appropriately adjusting the inclination angle and the degree of diffusion of the first reflecting portion 13 and the second reflecting portion 14.

(Embodiment 3)
Next, an embodiment of a light source device using the light guide member 1 of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The light source device X using the light guide member 1 of the present invention includes a housing 4 having the light guide member 1 and the light source 2 described in the first embodiment inside, and an emitting portion 12 of the light guide member 1. And a diffusion section 6 for diffusing the light.

  In the above configuration, the light guide member 1 according to the second embodiment is provided as the first reflecting portion 13a of the light guide member 1 described in the first embodiment. As the second reflection portion 14b of the light guide member 1 described in the above, the light guide member 1 according to the second embodiment includes the reflectors 130 and 140 provided separately from each other.

  The casing 4 is made of a metal having high thermal conductivity such as aluminum and is formed into a bowl shape having a U-shaped cross section, and one side wall (light source side casing side wall) 41 of the casing 4 is formed. On the inner wall, a first external reflector (external reflector) 410, which is another reflector, is provided in the vertical direction (thickness direction y), and the second external reflector 411 is in the horizontal direction (width direction x). Further, the light source 2 is disposed on the inner wall of the bottom wall 42 so that the heat of the light source 2 is efficiently radiated by the housing 4 via the heat conductive sheet 420. In this case, the light guide member 1 is stably mounted by a locking mechanism (not shown) provided in the housing 5.

  The first external reflector 410 reflects the light emitted from the light guide member 1 or the light reflected by the second external reflector 42b into the diffuser 6 or the light guide member 1. For example, it is made of a metal plate having a reflecting function such as aluminum or silver. In this case, the first external reflection part 410 is processed to have a reflection function by the same processing method as the first reflection part 13a and the second reflection part 14b described in the first embodiment. Also good.

  In addition, the second external reflection unit 411 receives the light emitted from the light guide member 1 or the light reflected by the first external reflection unit 41a as the diffusion unit 6, the external reflection unit 411, or the light guide member 1. Like the first external reflection portion 410, it is provided to be reflected inside, and is made of a metal plate having a reflection function, such as aluminum or silver. In this case, the second external reflection part 411 is processed by the same processing method as the first reflection part 13a and the second reflection part 14b described in the first embodiment, similarly to the first external reflection part 410. Processing for having a reflection function may be performed.

  Further, the diffusion part 6 is a plate-like member made of a transparent or translucent resin material, and is detachably attached to the casing 4. Further, the diffusion part 6 includes the casing 4 and the diffusion part 6. The light guide member 1, the light source 2, and the like are accommodated in the accommodation portion 43 to be formed.

  Next, the optical path of the light guided by the incident portion 11 of the light guide member 1 in the light source device X will be described with reference to FIG. The same parts are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 7, two types of typical optical paths are described: an optical path M indicated by a broken line and an optical path N indicated by a one-dot chain line.

  First, in the optical path M, as described in the first embodiment, the light incident from the incident part 11 passes through the optical path indicated by reference numerals M1 to M6 as shown in FIG. The emitted light is emitted from 12a and travels toward the first external reflection unit 410 (the optical path indicated by reference numeral M7 in FIG. 7), and is reflected by the first external reflection unit 410 and travels toward the diffusion unit 6. (The optical path indicated by reference numeral M8 in FIG. 7), the light source device X emits light after being diffused by the diffusion unit 6.

  Next, the optical path N will be described. As shown in FIG. 6, the light incident from the incident part 11 is emitted from the flat part 12b through optical paths indicated by reference numerals N1 to N3, and the light is diffused. The light source device X emits light after being diffused by the unit 6.

  Therefore, the light emitted from the light guide member 1 is diffused over the entire surface of the diffusing unit 6 and the light source device X emits light.

  In the above configuration, by providing the light diffusing unit 6 in the light source device X, the directivity of the light emitted from the light guide member 1 can be relaxed, uniform light can be emitted, and the luminance can be made uniform. In addition, it is possible to reduce glare (glare).

  In the above-described configuration, each of the first reflecting portion 13a, the second reflecting portion 14b, the first external reflecting portion 410, and the second external reflecting portion 411 is given (has been) or not given (has been given). ) Will be described with reference to the explanatory diagrams of the simulation results shown in FIGS.

  8 and 9, the housing 4 and the heat diffusion sheet 42 a do not directly contribute to the reflection / diffusion function, and therefore are indicated by dotted lines, and the diffusing unit 6 receives light emitted from the light guide member 1. In order to understand how to go to the diffusing section 6, it is schematically separated from the housing 4 and indicated by a dotted line.

  First, when the first reflecting portion 13a, the second reflecting portion 14b, the first external reflecting portion 41a, and the second external reflecting portion 42a are not diffused, as shown in FIG. Light is guided into the light guide member main body 10 from the incident portion 11, and as described in detail in the first embodiment, the light guide member main body undergoes a plurality of reflections including total reflection at the curved surface portion 12a. Since the light is emitted from the entire 10 emission parts 12 and then enters the diffusion part 6, it functions as a light source device that emits light over the entire surface in the emission direction w1.

  Next, when the first reflecting portion 13a, the second reflecting portion 14b, the first external reflecting portion 41a, and the second external reflecting portion 41b are provided with a diffusive function in addition to the reflecting function, as shown in FIG. The light from the light source 2 is guided into the light guide member main body 10 from the incident portion 11 and undergoes multiple reflections including total reflection at the curved surface portion 12a as described in detail in the first embodiment. Since the light is emitted from the entire light emitting part 12 of the light guide member body 10 and then enters the diffusion part 6, it functions as a light source device that emits light over the entire surface in the light emitting direction w1.

  The processing for imparting diffusibility to the first reflecting portion 13a, the second reflecting portion 14b, the first external reflecting portion 41a, and the second external reflecting portion 41b is the dot exemplified in the first embodiment. Processing such as printing, embossing, V-groove processing, microprism processing, or microlens processing is directly applied to the first reflecting portion 13a, the second reflecting portion 14b, the first external reflecting portion 41a, and the second external reflecting portion 41b. The diffusivity may be given, or a reflective member having a diffusivity may be used, for example, using MCPET (registered trademark of Furukawa Electric Co., Ltd.) which is a highly diffusive reflective sheet. Also good.

  As described above, when the first reflecting portion 13a, the second reflecting portion 14b, the first external reflecting portion 41a, and the second external reflecting portion 41b are made diffusive in addition to the reflecting function, as shown in FIG. By the reflection phenomenon having diffusibility, the intensity of the amount of light incident on the diffusing portion 6 is alleviated, and more uniform diffusion is performed.

  Here, the case where the second reflecting portion 14, the first external reflecting portion 41a, and the second external reflecting portion 41b are given diffusivity or not, and the second reflecting portion 14 is inclined. The uniformity of light with and without the case will be described with reference to FIG.

  FIG. 10 is an explanatory diagram based on a simulation result obtained by measuring the uniformity of light in the light source device X using the light guide member 1 of the first embodiment, and includes four types of characteristic curves 1 to o. Characteristic curves are listed.

  The characteristic curve 1 is a characteristic curve when the second reflecting portion 14, the first external reflecting portion 41a, and the second external reflecting portion 41b are diffusive and have an inclination, and the characteristic curve m is the second characteristic curve m. The characteristic curve n is a characteristic curve when the reflection part 14, the first external reflection part 41a, and the second external reflection part 41b are not diffusive and have an inclination, and the characteristic curve n is the second reflection part 14 and the first external reflection part. The characteristic curve is a characteristic curve when the reflection part 41a and the second external reflection part 41b are diffusive and not inclined, and the characteristic curve o is the second reflection part 14, the first external reflection part 41a, and the second. It is a characteristic curve when the external reflection part 41b does not have diffusibility and does not have an inclination.

  In the graph of FIG. 10, the horizontal axis q represents the distance from the light source 2, and the vertical axis p represents the amount of light when the value of the vertical axis at the highest brightness point is 1 in each of the above four cases. Represents the uniformity of the light emitted from the light guide member 1.

  Furthermore, when the diffusibility is given, the simulation is performed for the case where the diffusibility is increased as the distance from the incident portion 11 increases. When the light guide member is actually manufactured, for example, the diffusibility can be increased by increasing the ratio of the diffusing particles contained in the ink when performing dot printing.

  From the graph of the simulation result, since the second reflecting portion 14, the first external reflecting portion 41a, and the second external reflecting portion 41b have diffusivity, the amount of change in the vertical axis is reduced, and the light guide member It can be seen that the light is uniformly emitted when 1 is inclined at the second reflecting portion 14.

  By configuring as described above, the light source device X guides the light from the light source 2 from the incident portion 11 of the light guide member main body 10 and totally reflects it at the curved surface portion 12a. The reflected light is further reflected by the first reflecting portion 13 and / or the second reflecting portion 14 to be emitted from the curved surface portion 12a and the flat surface portion 12b of the light guide member body 10, and the emitted light is diffused by the diffusion portion. 6 can be diffused.

  Therefore, by providing the light guide member 1 that emits light over the entire surface in the emission direction w1 and the diffusing unit 6, it is possible to provide the light source device X that has a function of emitting light uniformly by itself.

  In Embodiment 3 of the light source device of the present invention, the light source device X has been described using the plate-like diffusion unit 6, but the outer surface of the light source device X may be rounded, The inner surface of the light source device X may be shaped along the emission part 12 of the light guide member 1 and is not limited to the third embodiment. In any case, it is possible to provide a light source device that emits light over the entire surface and has improved uniformity.

  In the third embodiment of the light source device of the present invention, the light guide member 1 described in the second embodiment may be used, and is not particularly limited to the third embodiment.

  In FIG. 11, the process in which the light guided from the incident portion 11 into the light guide member 1 is emitted through a plurality of reflections including total reflection inside the light guide member body 10 is described in the second embodiment. The same parts are denoted by the same reference numerals, and the diffusing unit 6 is schematically shown so that the light emitted from the light guide member 1 is directed to the diffusing unit 6. 2 is separated from the housing 4 and indicated by a dotted line.

  In this case, the light guided from the incident portion 11 into the light guide member 1 is represented by the curved surface portion 12a and the flat surface portion as represented by the optical path S (broken line) and the optical path T (dashed line) shown in FIG. Since the light is emitted from 12b and enters the diffusing portion 6, a light source device that emits light over the entire surface in the emission direction w1 can be realized.

  Furthermore, in Embodiment 3 of the light source device of the present invention, the light source device X includes backlights for televisions, mobile phones, and other information display devices, standlights, light bulb-type lightings, and others, outdoor lights, indoor lights, etc. It is possible to apply to a light source device for general illumination.

  In Embodiment 3 of the light source device of the present invention, the light source device X has been described by taking as an example the case where it includes the diffusing unit 6. However, the present invention is not limited to this. When used for a backlight of an apparatus or the like, the diffusing unit 6 may be omitted. In this case, the light guide member 1 has directivity in the emission direction w2, but it is possible to provide a light source device that emits light over the entire surface in the emission direction w2.

(Embodiment 4)
Next, with respect to an embodiment of an illuminating device using the light guide member 1 of the present invention, FIG. Will be described with reference to FIG.

  The lamp for the straight tube fluorescent lamp is a lamp for a straight tube fluorescent lamp, that is, a fluorescent lamp fixture to which a straight tube fluorescent lamp discharge tube is attached, and the light guide member of the first embodiment and The same parts as those of the light source device of Embodiment 2 are denoted by the same reference numerals, and the description thereof is omitted.

  A plurality of illumination devices Y using the light guide member 1 of the present invention are arranged so as to abut on the incident portion 11 of the light guide member body 10 of the light guide member 1 described in detail in the first embodiment. A light source 2 is formed by mounting the LED chip 21 on the elongated LED substrate 22 at a predetermined interval, and a circuit unit 7 is formed by a power supply circuit that supplies power to the light source 2 and a control circuit that controls the power supply circuit. The housing portion 53 for housing the circuit portion 7, the light source 2, and the light guide member 1 is formed in the housing 5 made of aluminum having high heat dissipation, and the housing portion 53 of the housing 5 has the above-described housing portion 53. A diffusion plate (diffusion unit) 6 that accommodates the circuit unit 7, the light source 2, and the light guide member 1 and diffuses the light emitted from the light guide member 1 so as to close the opening surface of the housing unit 53 of the housing 5. Is attached in a detachable manner, and the casing 5 and the diffusing portion 6 are arranged at both ends in the longitudinal direction y. A pair of mounting pins 91a, which are detachably mounted on the bases 91, 92 for mounting the diffusing portion 6 and can be mounted on sockets (not shown) of lamps for current straight tube fluorescent lamps. 91b and 92a, 92b are provided respectively.

  The pair of mounting pins 91a, 91b and 92a, 92b are used to supply commercial power to the circuit unit 7 by being mounted on the socket of the lamp, and to mount the lighting device itself to the lamp.

  Further, a step is provided inside the bottom wall 52 of the casing 5, and one stage 521 includes a plurality of the light sources 2 including the LED chips 21 and the LED substrates 22. It is provided via the heat conductive sheet 52b so that it may contact | abut to the incident part 11 of the said light guide member 1 along the longitudinal direction y of one end. The heat conductive sheet 52 b conducts heat from the LED chip 21 to the housing 5.

  In the other stage 522, the circuit unit 7 including a circuit board 7b having a drive circuit 7a, a control circuit, and the like for driving the light source 2 transfers the heat from the circuit unit 7 to the casing 5. It is provided through a heat conductive sheet 52c that conducts to the heat.

  An insulation sheet 51b is provided on one side wall (light source side housing side wall) 51 of the housing 5, and the external reflection portion 51a is held so as to be inclined. By doing so, more light emitted from the light guide member 1 can be reflected in the direction of the diffusing portion 6 than when there is no inclination, and therefore re-enter the light guide member 1. In addition, there is an effect of improving luminance in the entire region K in the longitudinal direction y close to the light source side housing side wall 51 of the diffusing portion 6 as viewed from the emission direction w1.

  Next, the circuit configuration of the illumination device Y will be described with reference to FIG. One full-wave rectifier 71 is connected between the mounting pins 91a and 91b of the base 91 via an impedance element 710, and the other full-wave is connected between the mounting pins 92a and 92b of the base 92. The rectifying unit 72 is connected via the impedance element 720.

  The impedance element 710 is a resistor R1 and a capacitor C1, and the resistor R1 and the capacitor C1 constitute a parallel circuit and connected between the caps 91a and 91b. Similarly, the impedance element 720 is also a resistor. R2 and a capacitor C2. The resistor R2 and the capacitor C2 constitute a parallel circuit and are connected between the caps 92a and 92b.

  Further, one end of a light source circuit assembly unit 20 including a plurality of light source circuits 20 a including the resistor 20 a and the LED chip 21 as the light source 2 is connected to the anode side of the full wave rectification units 71 and 72. One end of a resistor 73a is connected to the anode side of the full-wave rectifying units 71 and 72.

  One end of a series circuit formed by connecting a transistor 73b and a resistor 73c in series is connected to the other end of the light source circuit assembly 20, and two diodes 73d are connected to the other end of the resistor 73a. One end of a series circuit connected in series is connected, and one end of a resistor 73e is connected to the other end of the resistor 73a. The other ends of the resistor 73c, the diode 73d, and the resistor 73e are connected to the cathode side of the full-wave rectifiers 71 and 72, respectively.

  The transistor 73b has a collector electrode connected to the light source circuit 20a and an emitter electrode connected to the resistor 73c. The base electrode of the transistor 73b is connected to a connection point between the resistor 73a and the resistor 73e. Has been. As described above, the constant current unit 73 is configured to keep the base voltage of the transistor 73b constant and keep the forward current of the LED chip 21 constant.

  As described above, according to the illuminating device Y according to the present invention, the light from the light source 2 is guided from the incident portion 11 of the light guide member 1 to be totally reflected, and the light that has been totally reflected is further The light is reflected by the first reflecting portion 13 and / or the second reflecting portion 14 and emitted to the outside of the light guide member 1, and the emitted light is diffused by the diffusing portion 6, whereby the emission direction w1 is reflected. Thus, it is possible to provide the illumination device Y that emits light over the entire surface.

  When the light source 2 is arranged on one side of the casing 5, the LED chips 21 are arranged on both sides of the casing 5 with the same size, the same shape, and the same arrangement interval. Compared to the above, the number of LED chips can be reduced.

  The light source 2 is disposed on one side of the housing 5, and the light guide member 1 does not emit the light guided from the incident portion 11 to the outside as it is. The position of the light source 2 is not visually recognized and the glare for the user can be reduced. Furthermore, since a long light guide distance can be ensured through a plurality of reflections (including total reflection), luminance unevenness can be suppressed.

  Furthermore, according to the illuminating device Y according to the present invention, the second reflecting portion 14 of the light guide member 1 is provided with an inclination, and the one stage provided on the inner side of the bottom wall 52 of the housing 5 By providing the light source 2, a space for accommodating the circuit unit 7 can be secured in the other step 522 inside the bottom wall 52 of the housing 5.

  Moreover, according to the illuminating device Y concerning this invention, since the said light source 2 and the said circuit part 7 are provided in the said housing | casing 5, the thin illuminating device Y can be implement | achieved while having favorable heat dissipation.

  Furthermore, according to the illumination device Y according to the present invention, the one full-wave rectifying portion 71 is interposed between the mounting pins 92 a and 92 b of the base 92 between the mounting pins 91 a and 91 b of the base 91. Since the other full-wave rectifying unit 72 is connected via the impedance elements 710 and 720, the lamps for various straight tube fluorescent lamps currently used, such as glow starter type fluorescent lamp fixtures, are used. When used, a large current from the power source is limited by the electric circuit element before being supplied to the glow starter, preventing a large current from being supplied to the glow starter, and also used for inverter type fluorescent lamp fixtures. In this case, the current flowing between the two pins of the base, that is, the electric circuit element can be detected, the voltage is normally applied to the LED, and the rapid start type fluorescent light is also applied. When used in instruments, electronic preheating current from the ballast it does not cause problems in the lighting or the like of only the LED is consumed flows into the electric circuit device.

  In Embodiment 4 of the lighting device of the present invention, the lighting device Y is applied to a backlight device for a television or a mobile phone, a stand light, a bulb-type lighting, and other general lighting devices such as an outdoor light and an indoor light. Is possible.

  Further, in Embodiment 4 of the lighting device of the present invention, the case 5 is described as an example in which the case 5 is formed of aluminum having high thermal conductivity (heat dissipation), but the present invention is not limited to this. Other metal such as copper, silver, titanium, or other metal having high thermal conductivity (heat dissipation) may be used, and the present invention is not limited to the fourth embodiment.

  Furthermore, in Embodiment 4 of the lighting device of the present invention, the impedance elements 710 and 720 have been described as configuring a parallel circuit with the resistor R1, the capacitor C1, the resistor R2, and the capacitor C2, respectively. It is not limited, and a series circuit may be configured. A circuit element of a resistor / capacitor and / or an inductance element may be used alone, or a parallel circuit or a series circuit combining the above circuit elements, or a combination of a parallel circuit and a series circuit. It may be configured and is not limited to the fourth embodiment.

  Furthermore, in Embodiment 4 of the illuminating device of the present invention, the light guide member 1 is described as an example in which the light guide member 1 is disposed inside the housing 5 as a single unit. However, the present invention is not limited to this. A plurality of the light guide members connected in the longitudinal direction y may be used, and the present invention is not limited to the fourth embodiment. In addition, when connecting the said small light guide member, it is preferable to use the adhesive material which has a refractive index comparable as this light guide member.

  In addition, by using a plurality of the above-described small light guide members, the light guides can be adapted to a plurality of types of housings, such as the current 20 W, 40 W, and 60 W straight tube fluorescent lamps. When the dimension of the member in the longitudinal direction y can be optimized and designed to be compatible with a plurality of types of casings, the light guide member can be used for different types of casings. It is only necessary to change the number, and it is not necessary to design a new one separately. At that time, if the dimension in the longitudinal direction y is the same as that of the light source 2 or an integral multiple thereof, the combination with the light source 2 becomes easy, and it is possible to prepare for a plurality of types of cases. More preferred.

  Furthermore, in the fourth embodiment of the illumination device of the present invention, the case where four light sources 2 are arranged in the longitudinal direction y has been described as an example. However, the present invention is not limited to this and may be used alone. A plurality other than four may be used, and is not limited to the fourth embodiment.

  In addition, when using a single light source, it is more efficient because there is less time and effort than arranging a plurality of light sources, assuming that the same number of LED chips are used in a casing of the same size. In the case of using a single light source, the size of the light source, particularly the dimension in the longitudinal direction y, is optimized so that it can be applied to a plurality of types of housings by simply changing the number of light sources arranged. When manufacturing a plurality of types of housings, the light source has dimensions that can accommodate a plurality of types of housings, so it is only necessary to change the number of the light sources disposed. Since no separate design is required, the overall cost can be reduced.

  In the fourth embodiment of the lighting device according to the present invention, the case where the lighting device Y that can be mounted on the lamp for a straight tube fluorescent lamp has been described. However, the present invention is not limited to this. For example, as shown in FIGS. 16 and 17, the present invention can be implemented with a lighting device that can be mounted on a light bulb-type lamp. The illumination device Z shown in FIGS. 16 and 17 emits light that contains the light guide member 1a and the light guide member 1b, the light source 2a, the light source 2b, and the circuit unit 7 that are the light guide member 1 described in the first embodiment. A case 55 having a flat square shape in the direction w1 and having an opening in the emission direction w1, a base 93 that can be mounted on a socket (not shown) of a lamp for a current light bulb, and heat generated from the light source 2 is released. The heat radiating fins 8 are provided, and the diffusion part 6 that diffuses the light emitted from the light guide member 1 is provided.

  Further, a step 560 and a step 570 for providing the LED chip 21a and the LED chip 21b are provided on the two opposing side walls 56 and 57 inside the casing 55, respectively, and the light guide member 1a and the light guide member are provided. 1b is provided such that the incident portion 11a and the incident portion 11b are in contact with the LED chip 21a and the LED chip 21b, respectively.

  In addition, between the said 2 light guide member 1 said 1st reflection part 13a, the 1st reflection part 13b, the reflective sheet 16 which has reflection and a diffusivity on both surfaces is inserted between the said light guide members 1a and 1b. , Have been affixed.

  In the above configuration, the light from the light source 2a and the light source 2b is guided from the incident portion 11a and the incident portion 11b of the light guide member 1a and the light guide member 1b, respectively, and in the light guide member 1a and the light guide member 1b. The light is emitted from the entire surface of the light guide member 1a and the light guide member 1b after being subjected to a plurality of reflections including total reflection, and the emitted light is incident on the diffusing unit 6. By being diffused, the illuminating device Y can emit light over the entire surface in the emission direction w1.

  Even in the above case, the illumination device Z is difficult to visually recognize the light source, and can emit light over the entire surface in the emission direction w1.

It is a schematic block diagram which shows embodiment of the light guide member of this invention. It is a principal part disassembled perspective view which shows embodiment of the light guide member of this invention. It is a principal part enlarged explanatory view for demonstrating the shape of the curved surface part (forming part) of FIG. It is explanatory drawing for demonstrating the optical path of embodiment of the light guide member of this invention. It is a schematic explanatory drawing for demonstrating the structure and optical path of other embodiment of the light guide member of this invention. It is a schematic block diagram which shows embodiment of the light source device using the light guide member of this invention. It is explanatory drawing for demonstrating the optical path of embodiment of the light source device using the light guide member of this invention. It is explanatory drawing based on the simulation result of the optical path of embodiment of the light source device using the light guide member of this invention. It is explanatory drawing based on the simulation result of the optical path of embodiment of the light source device using the light guide member of this invention. It is explanatory drawing based on the simulation result of the uniformity of the light radiate | emitted by embodiment of the light source device using the light guide member of this invention. It is explanatory drawing for demonstrating the optical path in the other form of embodiment of the light source device using the light guide member of this invention. It is a perspective view which shows the external appearance of embodiment of the illuminating device using the light guide member of this invention. It is a principal part disassembled perspective view which shows embodiment of the illuminating device using the light guide member of this invention. It is a schematic block diagram which shows embodiment of the illuminating device using the light guide member of this invention. It is an electric circuit diagram of an embodiment of an illumination device using the light guide member of the present invention. It is a schematic block diagram which shows the other form of embodiment of the illuminating device using the light guide member of this invention. (A) is a schematic top view of the illuminating device of FIG. 15, (b) is a schematic top view when the diffusion part and the light guide member of the illuminating device of FIG. 15 are removed. It is a partial expanded sectional view which shows the structure of the conventional surface emitting apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light guide member 1a Light guide member 1b Light guide member 2 Light source 2a Light source 2b Light source 4 Case 5 Case 6 Diffusion part 11 Incident part 11a Incident part 11b Incident part 12 Output part 12a Curved part (molding part)
12b Plane portion 13 First reflection portion (reflection portion)
14 Second reflection part (reflection part)
31 1st optical path 32 2nd optical path 41a 1st external reflection part (another reflection part)
41b Second external reflector (another reflector)
51a First external reflection part (another reflection part)
55 Case X Light source device Y Lighting device Z Lighting device

Claims (13)

  A light guide member comprising: a light-guiding member that guides light from a light source from an incident portion to totally reflect the light, and further reflects the totally reflected light by a reflecting surface to emit the light. A first optical path that guides light from the light source from the incident part and totally reflects the light from the molding part;
A light guide member, comprising: a second optical path that reflects the light totally reflected on the first optical path by a reflecting portion and emits the light from the molding portion. In the light guide member that guides light from the light source from the incident part and emits it from the emission part,
A molding part that totally reflects light guided from the incident part;
A reflection part that further reflects the light totally reflected by the molding part and emits the light from the molding part; and
A light guide member comprising: In the light guide member that guides light from the light source from the incident part and emits it from the emission part,
The light emitting member, wherein the light emitting part includes a forming part having an incident angle greater than a critical angle with respect to the light guided from the incident part.   5. The light guide member according to claim 3, wherein the light emitting part is formed by at least partially overlapping the light incident part and the molding part in a plane with respect to a light emitting direction of the light guide member. .   The said output part radiate | emits the light totally reflected in the said shaping | molding part in the same direction as the incident direction of the light from the said incident part, The any one of Claims 3-5 characterized by the above-mentioned. Light guide member.   The light guide member according to any one of claims 2 to 6, wherein the reflection portion is configured by a reflective member having diffusibility.   The light guide member according to any one of claims 1 to 7, wherein the forming portion has a shape using an equiangular spiral.   A light source device comprising: the light guide member according to any one of claims 1 to 8; and a light source. A diffusion unit for diffusing the light emitted from the light guide member;
The light source device according to claim 9, further comprising another reflecting portion that reflects light emitted from the light guide member.   An illumination device comprising the light guide member according to any one of claims 1 to 8.   The lighting device according to claim 11, further comprising another reflecting portion that reflects light emitted from the light guide member.   A light guide method characterized in that light from a light source is guided from an incident part and totally reflected by a shaping part, and the totally reflected light is reflected by a reflecting part and emitted from the shaping part.

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