JP2016051616A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive luminaire capable of obtaining linear illumination light having even brightness.SOLUTION: A luminaire 1 includes a laser light source part 10, and a long member 30 irradiated with beam light emitted from the laser light source part. On a surface formed in the longitudinal direction of the long member, provided is a wavelength conversion member converting the beam light to light having a different wavelength. The laser light source part and the long member are set so that the optical axis of the beam light is inclined to a surface on which the wavelength conversion member 31 is provided, and so that the beam light is radiated to the wavelength conversion member.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to an illumination device using laser beam light.

  In recent years, illumination devices using a laser diode (LD) as a light source have been developed. When using laser beam light (hereinafter referred to as “beam light”) as a light source for illumination, it is devised to illuminate a wide range by once converting it into diffused light instead of using highly directional beam light as it is. ing.

  For example, Patent Document 1 includes a first diffusion unit that diffuses light emitted from a laser light source unit, and a first wavelength conversion unit that converts the diffused light into light having a different wavelength. There has been proposed an illumination device that can make the light intensity uniform regardless of the position from the laser light source unit by changing the distribution density of the diffuser applied around.

  Further, in Patent Document 2, a reflection unit that reflects beam light and a fluorescent unit including a phosphor that is excited by irradiation with the beam light reflected by the reflection unit are provided, and the reflection unit is rotated by a movable mechanism. Thus, a linear illumination device that scans a fluorescent portion with reflected beam light has been proposed.

JP 2010-056003 A JP 2010-015902 A

  However, the illumination device proposed in Patent Document 1 has a problem that it is difficult to control the distribution density of the diffuser when the diffusion intensity of the first diffusion portion is changed depending on the position, and the manufacturing cost is increased. . In addition, the illumination device of Patent Document 1 has a problem that the incident efficiency to the first diffusion portion is low. Furthermore, the illumination device proposed in Patent Document 2 also has a problem that the device for scanning the light beam is complicated and large in size, and the manufacturing cost is high.

  The present invention has been made in view of the above points, and provides a lighting device that can obtain linear illumination light that is small, inexpensive, and uniform in brightness.

  In order to solve the above-described problem, an illumination device according to an embodiment of the present invention includes a laser light source unit and a long member to which the beam light emitted from the laser light source unit is irradiated. A wavelength conversion member that converts the light beam into light of a different wavelength is provided on a surface formed in a direction, and the laser light source unit and the elongated member are provided with an optical axis of the light beam. It is set so that it inclines with respect to the given surface, and it is set so that the said beam light may be irradiated to the said wavelength conversion member.

  According to the illumination device according to the embodiment of the present invention, by irradiating the light beam obliquely to the surface on which the wavelength conversion member is provided, the light beam is irradiated to the entire longitudinal direction of the wavelength conversion member, and the wavelength is changed. The illumination light can be obtained by conversion. Thereby, the illuminating device can obtain linear illumination light with uniform brightness with a simple, small, and inexpensive configuration including a long member provided with a laser light source section and a wavelength conversion member.

It is a side view which shows typically the structure of the illuminating device which concerns on 1st Embodiment of this invention. It is a top view which shows typically the structure of the illuminating device which concerns on 1st Embodiment of this invention. It is a perspective view which shows typically the structure of the illuminating device which concerns on 2nd Embodiment of this invention. It is a side view which shows typically the structure of the illuminating device which concerns on 2nd Embodiment of this invention. It is the top view which showed typically the beam shape of the beam light directly irradiated with respect to the wavelength conversion member from the laser light source part of the illuminating device which concerns on 2nd Embodiment of this invention. It is the top view which showed typically the beam shape of the beam light reflected with respect to the wavelength conversion member from the reflection member of the illuminating device which concerns on 2nd Embodiment of this invention. It is a side view which shows typically the structure of the illuminating device which concerns on 3rd Embodiment of this invention. It is the top view which showed the beam shape of the beam light directly irradiated with respect to the wavelength conversion member from the laser light source part of the illuminating device which concerns on 3rd Embodiment of this invention. It is the top view which showed the beam shape of the beam light reflected with respect to the wavelength conversion member from the reflection member of the illuminating device which concerns on 3rd Embodiment of this invention. It is a side view which shows the structure of the illuminating device which concerns on 4th Embodiment of this invention. It is a side view which shows typically the structure of the illuminating device which concerns on 5th Embodiment of this invention. It is a top view which shows typically the structure of the illuminating device which concerns on 5th Embodiment of this invention. It is a perspective view which abbreviate | omits a part of structure of the illuminating device which concerns on 6th Embodiment of this invention, and is shown typically in a cross section. It is an end elevation which omits a part of composition of an illuminating device concerning a 6th embodiment of the present invention, and shows typically.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In addition, embodiment shown below illustrates the illuminating device for actualizing the technical idea of this invention. Therefore, the present invention does not specify the lighting device as described below in the embodiment described below. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the members described in the embodiments are not intended to limit the scope of the present invention only to those unless otherwise specified. It is just an example. In addition, the drawings referred to in the following description schematically show the present invention, and therefore the scale, spacing, positional relationship, etc. of each member are exaggerated, or some of the members are not shown. There is a case. Moreover, in the following description, the same name and code | symbol indicate the same or the same member in principle, and detailed description is abbreviate | omitted suitably.

<First Embodiment>
As shown in FIGS. 1A and 1B, the illumination device 1 is for generating linear illumination light. The illumination device 1 includes a laser light source unit 10, a collimating lens 20, and a long member 30.

  The laser light source unit 10 irradiates the beam light BL in the longitudinal direction of the long member 30 described later. The specific configuration of the laser light source unit 10 is not particularly limited as long as it can irradiate the beam light BL. For example, the substrate, the laser diode fixed on the substrate, and the heat radiated when the laser diode is driven are dissipated. It can be composed of a heat sink or the like. In addition, you may comprise the laser light source part 10 so that it may irradiate from the slit which controls a beam diameter. In addition, according to the embodiment of the present invention, laser light is synonymous with beam light, and can be replaced with an expression of beam light.

  As shown in FIG. 1A, the laser light source unit 10 is arranged such that the optical axis of the emitted light beam BL is inclined at a predetermined angle with respect to the surface of the long member 30 on which the wavelength conversion member 31 is provided. . Thereby, the beam light BL emitted from the laser light source unit 10 is irradiated in a state inclined at a predetermined angle with respect to the wavelength conversion member 31. Here, a specific arrangement relationship between the optical axis of the light beam BL and the surface on which the wavelength conversion member 31 is provided will be described later.

  The collimating lens 20 converts the beam light BL emitted from the laser light source unit 10 into parallel light. The specific configuration of the collimating lens 20 is not particularly limited as long as it can collimate the beam light BL. For example, a plano-convex lens can be used. Here, as shown in FIGS. 1A and 1B, the collimating lens 20 is illustrated as an example provided inside the laser light source unit 10, but the specific arrangement position of the collimating lens 20 is particularly limited. Instead, it may be provided outside the laser light source unit 10 (for example, between the laser light source unit 10 and the long member 30). Further, the slit 13 for controlling the beam diameter may be provided between the collimating lens 20 and the long member 30.

  As shown in FIG. 1B, the collimating lens 20 can reduce the width of the beam light BL to be a predetermined width by collimating the beam light BL, so that a narrower and longer linear illumination light can be obtained. it can.

  The long member 30 is irradiated with the beam light BL emitted from the laser light source unit 10. The long member 30 is formed in a long flat plate shape having a width equal to or wider than the diameter of the beam light BL as shown in FIG. 1B, and a thin plate-like member having a flat surface as shown in FIG. 1A. It consists of A wavelength conversion member 31 is provided on one surface (here, the entire upper surface) formed in the longitudinal direction of the long member 30.

  The wavelength conversion member 31 converts the beam light BL into light having a different wavelength. The wavelength conversion member 31 is specifically a phosphor, and is applied to the surface of the long member 30, that is, the surface to which the beam light BL is irradiated. Here, as shown in FIG. 1B, the wavelength conversion member 31 is illustrated as an example provided on the entire surface of the long member 30, but is provided at least in a range where the beam light BL is irradiated. What is necessary is just to be provided in a part of surface of the elongate member 30. By irradiating such a wavelength conversion member 31 with the beam light BL, a part of the beam light BL is changed to light of Lambertian light distribution at the same wavelength as the beam light, and a part of the beam light BL. Changes to light excited by the wavelength conversion member 31. Then, the illumination light can be obtained by the light converted from the beam light BL by the wavelength conversion member 31. As an example, white illumination light can be obtained by using a blue laser diode as the laser light source unit 10 and using a yellow phosphor as the wavelength conversion member 31. Further, the amount of the wavelength conversion member 31 may be adjusted so that a part of the beam light BL is reflected on the surface of the long member 30 without being subjected to wavelength conversion.

  Here, as shown in FIG. 1A, the surface on which the wavelength conversion member 31 is provided is in a state of being inclined at a predetermined angle (for example, about 2 degrees) with respect to the optical axis of the beam light BL. Specifically, the surface on which the wavelength conversion member 31 is provided is arranged such that one end side in the longitudinal direction close to the laser light source unit 10 is disposed at the lower end in the vertical direction of the diameter of the beam light BL and the long side far from the laser light source unit 10. The other end side in the direction is arranged at the upper end in the vertical direction of the diameter of the light beam BL. The “up and down direction” is a direction substantially perpendicular to the surface on which the wavelength conversion member 31 is provided, and the “upward direction” is a direction away from the surface on which the wavelength conversion member 31 is provided. It means that.

  By arranging the surface on which the wavelength conversion member 31 is provided and the optical axis of the light beam BL as described above, the light beam BL emitted from the laser light source unit 10 is converted in wavelength as shown in FIG. 1B. Irradiation is within the range of the member 31. Specifically, as shown in FIG. 1A, in the wavelength conversion member 31, one end in the longitudinal direction near the laser light source unit 10 is irradiated with the lower end of the beam light BL, and the other end in the longitudinal direction far from the laser light source unit 10. Is irradiated with the upper end of the light beam BL. The beam shape BP of the light beam BL irradiated to the wavelength conversion member 31 has an elongated elliptical shape in which the width on one end side and the other end side in the longitudinal direction is narrow and the center width in the longitudinal direction is thick. Thereby, the luminance distribution of the beam light BL irradiated to the wavelength conversion member 31 has the minimum light intensity at one end side and the other end side in the longitudinal direction, and the maximum light intensity at the center in the longitudinal direction.

  According to the illuminating device 1 having the above configuration, the light beam BL is irradiated over the entire longitudinal direction of the wavelength conversion member 31 by irradiating the light beam BL obliquely to the surface on which the wavelength conversion member 31 is provided. It is possible to obtain illumination light obtained by converting at least a part or all of the wavelengths. Thereby, the illuminating device 1 can obtain linear illumination light with uniform brightness with a simple, small, and inexpensive configuration including the long member 30 provided with the laser light source unit 10 and the wavelength conversion member 31. .

Second Embodiment
An illuminating device 1A according to the second embodiment of the present invention is an improved example for making the luminance distribution of the illuminating device 1 (see FIG. 1B) more uniform. As shown in FIGS. 2A and 2B, the lighting device 1 </ b> A according to the second embodiment illuminates the surface of the long member 30 on which the wavelength conversion member 31 is provided, as shown in FIGS. 2A and 2B. In addition to the configuration of the illumination device 1, the reflection member 40 is further provided at an angle different from that shown in FIG. Hereinafter, a specific configuration of the lighting device 1A will be described.

  1 A of illuminating devices provide the laser light source part 10 in the one end side of the elongate member 30, and provide the reflection member 40 in the other end side of the elongate member 30. As shown in FIG. In the illumination device 1A, the surface on which the wavelength conversion member 31 is provided is a beam light as shown in FIG. 2B, compared to the surface in the illumination device 1 on which the wavelength conversion member 31 is provided (see FIG. 1B). The inclination angle of BL with respect to the optical axis is shallow. Thereby, 1 A of illuminating devices are provided so that the laser light source part 10 may irradiate the wavelength conversion member 31 and the reflection member 40 with the beam light BL. Specifically, the illumination device 1A irradiates the wavelength conversion member 31 with light that is below the optical axis of the beam light BL from the laser light source unit 10, and is above the optical axis of the beam light BL from the laser light source unit 10. It is comprised so that the light which becomes may be irradiated to the reflection member 40. FIG.

  That is, the surface on which the wavelength conversion member 31 is provided is arranged such that one end side in the longitudinal direction near the laser light source unit 10 is disposed at the lower end in the vertical direction of the diameter of the beam light BL and the other in the longitudinal direction far from the laser light source unit 10. The end side is disposed at the center in the vertical direction of the diameter of the beam light BL. Note that the inclination angle of the surface on which the wavelength conversion member 31 is provided with respect to the optical axis of the light beam BL is, for example, the illumination device 1 (see FIG. 1A), the diameter of the light beam BL, and the wavelength conversion member viewed from the emission direction of the light beam. When the length of 31 is the same, it can be set as the half inclination angle (for example, about 1 degree) of the said illuminating device 1. FIG.

By arranging the surface on which the wavelength conversion member 31 is provided and the optical axis of the beam light BL as described above, the lower half of the optical axis of the beam light BL emitted from the laser light source unit 10 is the wavelength conversion member. Irradiation is within the range of 31. Specifically, as shown in FIG. 2B, in the wavelength conversion member 31, the lower end of the light beam BL is irradiated to one end side in the longitudinal direction near the laser light source unit 10, and the other end side in the longitudinal direction far from the laser light source unit 10. Is irradiated with the center of the light beam BL.
The beam shape BP1 irradiated to the wavelength conversion member 31 has a shape in which the width on one end side in the longitudinal direction is narrow and the width on the other end side is thick, as shown in FIG. 2C. As a result, the luminance distribution of the beam light BL irradiated to the wavelength conversion member 31 has the minimum light intensity on one end side in the longitudinal direction and the maximum light intensity on the other end side in the longitudinal direction. The beam shape BP1 shown in FIG. 2C shows only the lower half component of the light beam BL directly irradiated on the wavelength conversion member 31 from the laser light source unit 10, and the component of the light beam BL reflected by the reflecting member 40. Is not shown.

  After the reflection member 40 is emitted from the laser light source unit 10, the light beam BL that has not been irradiated on the surface of the long member 30 on which the wavelength conversion member 31 is provided is directed toward the surface on which the wavelength conversion member 31 is provided. It is for reflection. As shown in FIGS. 2A and 2B, the reflecting member 40 is disposed on the other end side in the longitudinal direction of the long member 30, and here, the reflecting member 40 includes two members, a first reflecting member 41 and a second reflecting member 42. Yes.

  The first reflecting member 41 is formed of a flat plate member having a width equal to or wider than the diameter of the beam light BL. And this 1st reflection member 41 is formed with the material which has reflectivity, or the reflective surface is formed by providing the material which has reflectivity on the surface (here the whole upper surface). For example, specifically, a metal plate such as aluminum or a glass plate formed with a metal film such as aluminum can be used.

  The first reflecting member 41 is provided on the other end side in the longitudinal direction of the long member 30. In addition, as shown in FIG. 2B, the reflecting surface of the first reflecting member 41 is arranged such that one end side close to the long member 30 is located on the center (optical axis) side in the vertical direction of the diameter of the beam light BL. In addition, the other end side of the reflecting surface is disposed on the upper end side in the vertical direction of the diameter of the beam light BL. Thereby, after the 1st reflection member 41 is radiate | emitted from the laser light source part 10, the upper half of the beam light BL which was not irradiated to the surface in which the wavelength conversion member 31 of the elongate member 30 was provided is 2nd reflection member. 42 is reflected.

  The 2nd reflection member 42 is provided along with the other end side of the 1st reflection member 41, as shown to FIG. 2A and 2B. The second reflecting member 42 is formed to have a width equal to or wider than the diameter of the beam light BL, and the surface is configured as a convex curved reflecting surface. The second reflecting member 42 is formed of a reflective material, or a reflective surface is formed by providing a reflective material on the surface (here, the entire convex surface which is the right surface). Yes. For example, specifically, a metal plate such as aluminum or a glass plate formed with a metal film such as aluminum can be used.

  Here, as shown in FIG. 2B, the shape of the second reflecting member 42 is formed in a cylindrical curved surface corresponding to a part of the cylinder. Further, the reflection surface of the second reflection member 42 is arranged so that the cylindrical axis direction (bus line direction) and the surface on which the wavelength conversion member 31 is provided are parallel to each other. That is, the second reflecting member 42 is not arranged to be inclined with respect to the surface on which the wavelength conversion member 31 is provided, and the cylindrical axis direction and the surface on which the wavelength conversion member 31 are provided are aligned in parallel. It is arranged to become. The shape of the second reflecting member 42 is not limited to the cylindrical curve, and may be formed in a cylindrical curved surface corresponding to an elliptic curve, a parabola, or a hyperbola.

  The illumination device 1 </ b> A provides such a reflection member 40 to reflect the upper half of the optical axis of the light beam BL not irradiated on the wavelength conversion member 31 to the wavelength conversion member 31 as shown in FIG. 2B. Moreover, the beam shape BP2 of the light beam BL is reversed from the state shown in FIG. 2C by being reflected by the reflecting member 40 (here, a total of two reflections). Therefore, the reflected light through the reflecting member 40 has a beam shape BP2 opposite to the beam shape BP1 when the wavelength converting member 31 is directly irradiated, as shown in FIG. 2D.

  Therefore, the beam shape BP2 reflected by the reflection member 40 to the wavelength conversion member 31 has a shape with a large width on the laser light source unit 10 side and a narrow width on the reflection member 40 side. As a result, the luminance distribution of the beam light BL reflected by the wavelength conversion member 31 has the maximum light intensity at one end in the longitudinal direction and the minimum light intensity at the other end in the longitudinal direction. Therefore, the luminance distribution is also opposite to the beam shape BP1. The beam shape BP2 shown in FIG. 2D shows only the component of the beam light BL reflected by the reflecting member 40, and the component of the beam light BL directly irradiated on the wavelength conversion member 31 from the laser light source unit 10 is shown. Illustration is omitted.

  Thus, the illuminating device 1A directly irradiates the wavelength conversion member 31 with the lower half from the optical axis of the beam light BL, and the reflection member 40 disposed on the other end side in the longitudinal direction of the long member 30 causes the beam light BL. The wavelength conversion member 31 is irradiated by reflecting the upper half from the remaining optical axis. That is, the illumination device 1A forms the beam shape BP2 of the beam light BL by the reflecting member 40 in consideration of the beam shape BP1 (see FIG. 2C) of the beam light BL irradiated to the wavelength conversion member 31. Then, the illuminating device 1A superimposes the beam light BL directly irradiated on the wavelength conversion member 31 and the beam light BL reflected by the reflection member 40 (see FIG. 2A), thereby forming the beam shape BP of the wavelength conversion member 31. Uniform irradiation is performed throughout. Thus, linear illumination light with uniform brightness is obtained.

<Third Embodiment>
In the illumination device 1A, the reflection surface of the second reflection member 42 has been described as a cylindrical curved surface. However, as shown in FIGS. 3A to 3C, the illumination device using the second reflection member 42A having a planar reflection surface. A configuration like 1B may be used. The lighting device 1B has the same configuration as the lighting device 1A (see FIG. 2A) except for the second reflecting member 42A.

  As shown in FIG. 3A, the lighting device 1B uses a second reflecting member 42A having a planar reflecting surface. As shown in FIG. 3C, the second reflecting member 42 </ b> A is installed so as to be inclined so that the position where the light intensity of the reflected beam light becomes maximum is one end side in the longitudinal direction of the wavelength conversion member 31. Therefore, the region of the beam light BL reflected from the second reflecting member 42 to the wavelength conversion member 31 is smaller than that of the lighting device 1A using the second reflecting member 42 having a curved reflecting surface (see FIG. 2D). However, it is possible to reflect the reflected light to the wavelength conversion member 31 so as to cover a range where the wavelength conversion member 31 is not directly irradiated or difficult to be irradiated.

  Therefore, as shown in FIG. 3B, the illumination device 1B has the beam light directly irradiated on the wavelength conversion member 31 and the beam light reflected and irradiated on the wavelength conversion member 31 as shown in FIG. 3C. It is possible to irradiate the entire wavelength conversion member 31 uniformly and obtain linear illumination light with sufficiently uniform brightness. The beam light directly irradiated on the wavelength conversion member 31 is irradiated as the beam shape BP1, and the beam light reflected and irradiated on the wavelength conversion member 31 is irradiated on the wavelength conversion member 31 as the beam shape BP2. Moreover, since the illuminating device 1B uses the flat plate-like second reflecting member 42A, the manufacturing cost can be further reduced as compared with the illuminating device 1A, and the installation area of the reflecting member 40A can be further reduced. 3B shows only the beam shape BP1, and FIG. 3C shows the beam shapes BP1 and BP2.

<Fourth embodiment>
An illuminating device 1C according to the fourth embodiment of the present invention is a further improvement example for making the luminance distribution of the illuminating device 1 (see FIG. 1A) uniform. As shown in FIG. 4, the lighting device 1 </ b> C has the same configuration as the lighting device 1 described above (see FIG. 1B) except that a curved long member 30 </ b> A is used instead of the flat plate-like long member 30. ing.

  As shown in FIG. 4, the long member 30 </ b> A is formed to be curved so that the incident angle of the beam light BL at one end and the other end is smaller than the center in the longitudinal direction. In addition, the surface of the long member 30A on which the wavelength conversion member 31 is provided is specifically arranged such that one end side in the longitudinal direction near the laser light source unit 10 is arranged at the lower end in the vertical direction of the diameter of the beam BL. The other end side in the longitudinal direction far from the light source unit 10 is arranged at the upper end in the vertical direction of the diameter of the beam light BL.

  The illumination device 1C uses such a curved long member 30A, so that the irradiation area of the beam light BL at both ends of the wavelength conversion member 31 is larger than that of the illumination device 1 (see FIG. 1B). In addition, the irradiation area of the light beam BL at the center of the wavelength conversion member 31 can be maintained with the size shown in FIG. 1B. Thereby, 1 C of illuminating devices can reduce the fall of the brightness | luminance of the both ends of the wavelength conversion member 31, and can make luminance distribution more uniform over the longitudinal direction of the wavelength conversion member 31. FIG.

<Fifth Embodiment>
As shown in FIGS. 5A and 5B, the lighting device 1D according to the fifth embodiment of the present invention uses a divided long member 30B composed of three pieces instead of the single long member 30. Has the same configuration as the illumination device 1 (see FIG. 1B).

  As shown in FIGS. 5A and 5B, the long member 30B has a surface on which the wavelength conversion member 31 is provided, which is divided into two along the optical axis of the light beam BL in the short direction, and in the short direction. One of the two parts is further divided into two in the longitudinal direction. Specifically, the surface of the long member 30B on which the wavelength conversion member 31 is provided has a first surface 30Ba that is the other side divided into two in the short-side direction, and one side that is divided into two in the short-side direction is further long. It consists of a second surface 30Bb on one side and a third surface 30Bc on the other side, which are divided into two in the direction.

  As shown in FIG. 5A, the first surface 30Ba, the second surface 30Bb, and the third surface 30Bc are arranged at different heights within the range of the diameter of the beam light BL in the vertical direction. That is, the first surface 30Ba has one end side in the longitudinal direction close to the laser light source unit 10 disposed at the lower end in the vertical direction of the diameter of the beam light BL, and the other end side in the longitudinal direction far from the laser light source unit 10 has the beam light BL. It is arrange | positioned at the upper end in the up-down direction of the diameter of. The second surface 30Bb is arranged such that one end side in the longitudinal direction close to the laser light source unit 10 is arranged at the center in the vertical direction of the diameter of the beam light BL, and the other end side in the longitudinal direction far from the laser light source unit 10 is the beam light BL. It is arrange | positioned at the upper end in the up-down direction of the diameter of. The third surface 30Bc is arranged such that one end side in the longitudinal direction near the laser light source unit 10 is disposed at the lower end in the vertical direction of the diameter of the beam light BL, and the other end side in the longitudinal direction far from the laser light source unit 10 is the beam light BL. It is arrange | positioned in the center in the up-down direction of the diameter of.

  Here, as shown in FIGS. 5A and 5B, the first surface 30Ba has an irradiation area that is halved with respect to the long member 30 of the illumination device 1 (see FIG. 1B) according to the first embodiment. That is, the first surface 30Ba, which is the other divided in the short direction, is irradiated from the lower end to the upper end of the diameter of the light beam BL from one end to the other end in the longitudinal direction of the first surface 30Ba. Installed. The second surface 30Bb close to the laser light source unit 10 is irradiated with the upper half from the optical axis of the beam light BL. That is, the second surface 30Bb, which is one of the two divided in the longitudinal direction, is installed so that one light that is half of the optical axis of the light beam BL is irradiated. And 3rd surface 30Bc far from the laser light source part 10 is arrange | positioned so that a lower half may be irradiated from the optical axis of the beam light BL. That is, the other third surface 30Bc divided into two in the longitudinal direction is installed so that the other light that is half of the optical axis of the light beam BL is irradiated. Accordingly, the first surface Ba is irradiated with light that is half (2/4) the irradiation area of the light beam BL, and the second surface Bb and the third surface Bc are light that is 1/4 of the irradiation area of the light beam BL. Each is installed to be irradiated. As shown in FIG. 5B, the illumination device 1D has the first surface 30Ba, the second surface 30Bb, and the third surface 30Bc arranged as described above, so that the luminance distributions of the respective surfaces are complemented as shown in FIG. A more uniform luminance distribution can be obtained than shown in FIG.

<Sixth Embodiment>
An illuminating device 1E according to the sixth embodiment of the present invention is an example in which the present invention is applied to a cylindrical arc tube. As illustrated in FIGS. 6A and 6B, the lighting device 1 </ b> E uses a long cylindrical member 30 </ b> C instead of the long member 30, and further includes a cover member 50. Further, the laser light source unit 10 (see FIG. 1A) (not shown) is installed so that the optical axis is inclined with respect to the generatrix at the center in the width direction of the cylindrical curved surface of the wavelength conversion member 31 provided on the long member 30C. . Therefore, the laser light source unit 10 (not shown) has an arrangement relationship in which the optical axis of the light beam BL is inclined with respect to the surface on which the wavelength conversion member 31 is provided, as in the case of the illumination device 1 described above. Yes.

  As shown in FIGS. 6A and 6B, the long member 30 </ b> C is formed in a long shape, and a cross section by a surface perpendicular to the longitudinal direction is formed in an arc shape that forms a part of the cylinder. Further, the long member 30C is integrated with a cover member 50 described later to constitute one circular tube. A wavelength conversion member 31 is provided on the inner surface of the arc formed in the longitudinal direction of the long member 30C, and the wavelength conversion is performed by irradiating the wavelength conversion member 31 with the beam light BL. Thus, illumination light can be obtained. Here, the wavelength conversion member 31 is provided on a part of the inner surface of the arc of the long member 30C in a cross-sectional view, but the wavelength conversion member 31 may be provided on the entire surface of the arc.

  As shown in FIGS. 6A and 6B, the cover member 50 is formed in an elongated shape, and a cross section is formed in an arc shape constituting a part of a cylinder. The cover member 50 covers the surface of the long member 30C on which the wavelength conversion member 31 is provided, and is formed separately from the long member 30C. The cover member 50 is made of a material having translucency, for example. Specific examples of materials include resins such as transparent acrylic, transparent polyethylene, and transparent ABS, or transparent glass. In addition, when it is set as the structure which provides the laser light source part 10 which is not shown in figure in the one end or the inside, the cover member 50 is preferably comprised with the material which has a light diffusivity, and, thereby, the beam light BL has directivity. It is possible to prevent light leaking with strong light beams. Specific examples of the material include a resin such as milk semi-acrylic, white polyethylene, white ABS, or white glass.

  The illumination device 1E includes the cover member 50 as described above, and is configured as a single cylinder, and emits linear illumination light by inclining the optical axis of the beam light with respect to the wavelength conversion member 31. It can be used as a small and inexpensive arc tube.

  The lighting device according to the present invention has been specifically described above by the mode for carrying out the invention. However, for example, the following configuration may be used. That is, the illumination devices 1A and 1B described above use two reflecting members, but if the light beam BL that has not been irradiated to the wavelength converting member 31 can be reflected again to the wavelength converting member 31, the reflecting member is It may be one (can be bent). Moreover, although it is preferable that all the above-described illumination devices 1, 1A, 1B, 1C, 1D, and 1E include the collimating lens 20, it is not necessary if the wavelength conversion member 31 can be irradiated with the light beam BL.

  Further, the illumination devices 1, 1A, 1B, 1C, and 1D described above may include a cover member like the illumination device 1E. In this case, for example, a cover member that covers the surface of the long members 30, 30 </ b> A, 30 </ b> B on which the wavelength conversion member 31 is provided and forms a single cylindrical object with the long members 30, 30 </ b> A, 30 </ b> B is used. be able to. Further, as a specific shape of the cover member in this case, for example, a cover member having a long shape and a U-shaped or arc-shaped cross section can be used. By providing such a cover member in the illumination devices 1A, 1B, 1C, and 1D, it can be used as a small and inexpensive straight tube type arc tube that emits linear illumination light.

  Further, instead of providing a cover member for the illumination devices 1, 1A, 1B, 1C, and 1D, for example, a cylindrical cover member is used, and the illumination devices 1A, 1B, 1C, and 1D are inserted into the cover member. However, it can also be used as an arc tube. In this case, the long members 30, 30A, 30B are inserted into the cylindrical cover member, and not only the surface side where the wavelength conversion member 31 of the long members 30, 30A, 30B is provided, but also the opposite surface. Is also configured to cover all.

  In addition, when combining the above-described cylindrical cover member and the illuminating device 1A including the reflecting member 40, or when combining the illuminating device 1B including the reflecting member 40A, the long member 30 is set to the angle inside the cover member. Place horizontally without a mark. And it is preferable to arrange | position the laser light source part 10 diagonally so that the optical axis of beam light BL may incline with respect to the surface in which the wavelength conversion member 31 of the said elongate member 30 was provided. Thereby, compared with the case where the elongate member 30 is arrange | positioned diagonally inside a cover member, the installation area | region of the elongate member 30 and the reflection members 40 and 40A can be made small.

  In addition, the lighting devices 1A, 1B, and 1C described above use the long flat plate-like long members 30 and 30A. However, the lighting devices 1A, 1B, and 1C are not limited to the long flat plate shape. A scale member can also be used. In this case, the wavelength conversion member 31 is provided on the bottom surface opposite to the opening, and a rectangular plate-like cover member is provided along the opening so as to cover the wavelength conversion member 31. It can be set as a lighting device.

  Furthermore, although the illuminating device 1E was demonstrated as a structure which provides the wavelength conversion member 31 on the upper surface of the elongate member 30C, wavelength conversion can be performed by mixing the phosphor which is the wavelength conversion member 31 in the elongate member 30C. It may be formed as a long member. In addition, by integrating the wavelength conversion member 31 and the long member 30C, the manufacturing process can be simplified and the number of members can be reduced.

1, 1A, 1B, 1C, 1D, 1E Illumination device 10 Laser light source 20 Collimating lens 30, 30A, 30B, 30C Long member 30Ba First surface 30Bb Second surface 30Bc Third surface 31 Wavelength converting member 40, 40A Reflection Member 41 First reflecting member 42, 42A Second reflecting member 50 Cover member BL Beam light BP Beam shape

Claims (8)

A laser light source unit, and a long member irradiated with the beam light emitted from the laser light source unit,
On the surface formed in the longitudinal direction of the long member, a wavelength conversion member that converts the beam light into light of a different wavelength is provided,
The laser light source section and the long member are set so that an optical axis of the beam light is inclined with respect to a surface on which the wavelength conversion member is provided, and the wavelength conversion member is irradiated with the beam light. Lighting device set to   The illuminating device according to claim 1, further comprising a collimating lens that collimates the beam light irradiated from the laser light source unit, and the wavelength conversion member is irradiated with the collimated light. In the case where the direction perpendicular to the surface provided with the wavelength conversion member is the vertical direction, and the direction away from the surface provided with the wavelength conversion member is the upward direction,
The surface on which the wavelength conversion member is provided is arranged such that one end side in the longitudinal direction close to the laser light source unit is disposed at the lower end in the vertical direction of the diameter of the beam light and the other in the longitudinal direction far from the laser light source unit. The lighting device according to claim 1, wherein an end side is disposed at an upper end in a vertical direction of a diameter of the beam light. The laser light source section provided on one end side in the longitudinal direction of the long member, and a reflection member provided on the other end side in the longitudinal direction of the long member, the laser light source section including the wavelength conversion member and the It is provided to irradiate the light beam to the reflecting member,
The lighting device according to claim 1, wherein the reflection member is installed so as to reflect the beam light emitted from the laser light source unit toward the wavelength conversion member. In the case where the direction perpendicular to the surface provided with the wavelength conversion member is the vertical direction, and the direction away from the surface provided with the wavelength conversion member is the upward direction,
The surface on which the wavelength conversion member is provided is arranged such that one end side in the longitudinal direction close to the laser light source unit is arranged at the lower end in the vertical direction of the diameter of the beam light, and the other end side in the longitudinal direction far from the laser light source unit is The illumination device according to claim 1, wherein the illumination device is disposed at an upper end in a vertical direction of the diameter of the beam light and is curved so that an incident angle of the beam light at one end and the other end is smaller than a center in a longitudinal direction. . The surface on which the wavelength conversion member is provided is divided into two along the optical axis of the light beam in the short direction, and one divided into two in the short direction is further divided into two in the long direction,
The first surface which is the other of the two divided in the short direction is installed such that the range from the lower end to the upper end of the diameter of the beam light is irradiated from one end to the other end in the longitudinal direction,
The second surface, which is one of the two divided in the longitudinal direction, is installed so that one light that is half of the optical axis of the beam light is irradiated,
3. The illumination device according to claim 1, wherein the other third surface divided into two in the longitudinal direction is installed so as to be irradiated with the other light that is half of the optical axis of the beam light. .   The illuminating device according to any one of claims 1 to 6, further comprising a translucent cover member that covers a surface side of the long member on which the wavelength conversion member is provided.   The lighting device according to claim 7, wherein the cover member is made of a light diffusing material.

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