JP2008004497A - Lens structure, and light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens structure enhanced in light utilization efficiency, and capable of achieving reduction of size and weight thereof by simplifying the whole structure thereof; and a light source device. <P>SOLUTION: This lens structure is provided with an outer lens body 22 having a parallel refraction lens part 29 emitting light having entered at an angle below a critical angle as parallel light. The lens structure is also provided with an inner lens body 23 refracting light exceeding the critical angle outside the light directly entering the parallel refraction lens part 29 at an angle below the critical angle, and entering the refracted light into the parallel refraction lens part 29 at an angle below the critical angle in the outside of the light having entered at the angle below the critical angle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens structure and a light source device.

  Light sources such as LEDs (light emitting diodes) and incandescent bulbs emit light radially to form a radiated light beam. For this reason, when such a light source is used for illumination or the like, it is necessary to condense light into parallel light parallel to one optical axis.

  As means for condensing the parallel light, one using a fullel lens as shown in FIG. 11, one using a paraboloid lens as shown in FIG. 12, a paraboloid lens as shown in FIG. Some use a parabolic reflector.

  That is, the light source device shown in FIG. 11 includes a casing 1 and a light source (for example, LED) 2 accommodated in the casing 1 as shown in FIG. The casing 1 includes a bottomed short cylindrical main body 1a and a substrate 1b that closes an opening of the main body 1a. And the said light source 2 is attached to the center part of the board | substrate 1b, and the Fullel lens 4 is formed in the inner surface of the bottom wall (lens member) 3 of the main-body part 1a. For this reason, when an electric current is supplied to the LED that is the light source 2, the LED emits light, and the light L 0 is incident on the Fullel lens 4. The light L0 incident on the Furnell lens 4 is bent into parallel light L01 parallel to the direction of the apparatus axis O and emitted from the bottom wall (lens member) 3 of the casing 1. Therefore, a light beam (parallel light flux) A1 having a circular cross section as shown in FIG. 11B is formed. In addition to the light source 2, circuit components (electronic components) are mounted on the substrate 1b.

  The light source device shown in FIG. 12 includes a light source 6 disposed on a substrate 5 and an internal total reflection parabolic lens 7 disposed in front of the light source 6. The internal total reflection type parabolic lens 7 reflects the light L0 incident from the light source side opening 8 on the inner surface, and converts the parallel light L01 parallel to the device axis O to the light source side opening. The light is emitted from the unit 9. Therefore, a light beam (parallel light beam) A2 having a circular cross section as shown in FIG. 12B is formed.

  In the light source device shown in FIG. 13, a light source 12 is disposed at the center of the parabolic reflector 11, and an internal total reflection type parabolic lens 13 is disposed in front of the light source 12. For this reason, the light L0 that has entered the parabolic lens 13 from the opening 14 on the light source side is reflected by the parabolic lens 13, and the parallel light L01 that is parallel to the axis of the parabolic lens 13 is reflected back. The light is emitted from the opening 15 on the light source side. Further, the light L from the light source 12 that does not enter the parabolic lens 13 from the light source side opening 14 is reflected by the parabolic reflecting mirror 11 and emitted as parallel light L3. For this reason, as shown in FIG.13 (b), the light beam (parallel light beam) A3 of a larger (wide range) than the light beam A2 shown in FIG.12 (b) is formed.

  However, as shown in FIG. 11, in the case of using the Furnell lens 4, when the light L0 from the light source 2 is incident on the Furnell lens 4 beyond the critical angle, the light L0 is totally reflected, It is not emitted as parallel light. For this reason, the light in the range of θ1 shown in FIG. 11A cannot be used.

  Further, as shown in FIG. 12, in the case where the parabolic lens 7 is used, the light in the range of θ2 that does not enter the parabolic lens 7 cannot be used, but the fullnel lens 4 shown in FIG. 11 is used. Compared to those, the range of θ2 that cannot be used is narrow, and light can be used effectively relatively. However, it is not preferable when an LED is used for the light source 6. That is, the LED has different light intensity depending on the angle. For this reason, when the intensity of light along the device axis O is 100%, the intensity of light decreases as the angle increases (the angle formed with respect to the axis O increases). Therefore, in the case where such a parabolic lens 7 is used, the light having a large intensity in the vicinity of the axis O corresponds to the central portion of the parallel light flux A2 as it is, and the intensity of the light away from the axis O. It is supposed that a lot of parallel light is composed of small ones. For this reason, the place where the intensity of light is strong (large) cannot be used. Further, the formed parallel light flux A2 could not be increased.

  When the parabolic lens 13 and the parabolic reflecting mirror 11 are combined as shown in FIG. 13, the parallel light beam A3 has a slightly larger diameter than that using only the parabolic lens 7 as shown in FIG. It becomes. However, in this case as well, since the parabolic lens 13 is used, it was not possible to use a place where the intensity of light was strong.

  For this reason, conventionally, a concentrator capable of improving the utilization efficiency of light has been proposed (Patent Document 1). The one disclosed in Patent Document 1 includes a plurality of reflecting surfaces (for example, a first reflecting surface, a second reflecting surface, a third reflecting surface, and a fourth reflecting surface that are inclined at a predetermined angle with respect to the parallel light to be formed. 4 reflection surfaces) and a lens portion provided on the inner diameter side of these reflection surfaces.

  In this case, the fourth reflection surface is positioned on the inner side of the first reflection surface with respect to the optical axis, the second reflection surface is positioned on the outer side of the first reflection surface with respect to the optical axis, and the third reflection is performed. The surface is positioned outside the first reflecting surface with respect to the optical axis.

The light incident on each reflecting surface is reflected by the reflecting surface and emitted as parallel light. That is, radiation light in a radiation angle range that deviates from the lens portion is received by the first reflection surface, radiation light in a radiation angle range that deviates from the first reflection surface is received by the fourth reflection surface, and radiation angle that deviates from the fourth reflection surface. The range of radiated light is received by the second reflecting surface, and the radiated light in the radiation angle range that deviates from the second reflecting surface is received by the third reflecting surface. This increases the light use efficiency.
JP 2005-209472 A

  However, in the thing of the said patent document 1 comprised so that the utilization efficiency for light could be aimed at, it was very complicated, and it was inferior to workability, and cost became high, and it was high-precision collector. It was difficult to provide. Further, this concentrator is composed of a block body made of a single translucent member, which is relatively large and heavy, and there is a problem in downsizing.

  In view of the above-described problems, the present invention provides a lens structure and a light source device that can improve the light use efficiency and simplify the overall configuration to achieve a reduction in size and weight.

  The lens structure of the present invention includes an outer lens body having a parallel bent lens portion that emits light incident below a critical angle as parallel light, and an outer critical angle of light that is directly incident on the parallel bent lens portion below the critical angle. And an inner lens body that causes the bent light to enter the parallel bent lens portion at a critical angle or less outside the light incident at a critical angle or less.

  According to the lens structure of the present invention, light exceeding the critical angle is bent by the inner lens body so as to be less than the critical angle. For this reason, the light directly incident on the critical angle or less from the light source and the light not directly incident on the critical angle or less from the light source can be emitted as parallel light by the parallel bending lens unit. In addition, light that is not directly incident below the critical angle is incident on the parallel bending lens portion outside the light that is incident below the critical angle, so that the cross-sectional area of the parallel luminous flux emitted from the outer lens body is incident. Can be increased.

  A fullnel lens can be used for the parallel bent lens portion of the outer lens body. Moreover, even if the inner lens body is disposed independently of the outer lens body, the inner lens body may be connected to the outer lens body.

  In addition, other lens structures include an outer lens body having a parallel bent lens portion that emits light incident at a critical angle or less as parallel light, and a critical lens outside the light directly incident on the parallel bent lens portion at a critical angle or less. A parabolic reflecting mirror that reflects light exceeding an angle and converts the reflected light into parallel light outside the light incident at a critical angle or less is provided.

  In other lens structures, light exceeding the critical angle is converted into parallel light by a parabolic reflector. For this reason, the light directly incident on the critical angle or less from the light source and the light not directly incident on the critical angle or less from the light source can be emitted as parallel light. In addition, since the light that does not directly enter below the critical angle is made parallel light outside the light incident below the critical angle, the cross-sectional area of the parallel light beam emitted from the outer lens body can be increased.

  The outer lens body may include a diffusion lens unit that diffuses parallel light. When the light is emitted as parallel light, the illumination light becomes a spot-like relatively small bundle of light. For this reason, if the diffusing lens part is provided, the illumination range can be enlarged.

  A light source device of the present invention includes a light source and a lens structure that emits radiated light from the light source as parallel light, and the lens structure according to any one of claims 1 to 5 is used for the lens structure. is there.

  According to the light source device of the present invention, when the radiated light from the light source enters the lens structure, the light incident on the parallel bent lens portion of the outer lens body at a critical angle or less enters the parallel bent lens portion as it is. It becomes parallel light. Further, the light that exceeds the critical angle with respect to the parallel bending lens portion is bent by the inner range member so as to be incident on the parallel bending lens portion at a critical angle or less. For this reason, most of the emitted light from the light source can be emitted as parallel light through the lens structure.

  Further, as the light source device, even if the light source is a point light source disposed on the axis of the lens structure, and the parallel light emitted from the lens structure is converged on a circular cross section, the light source is linear. It may be a light source, and the parallel light emitted from the lens structure may be converged to a rectangular cross section.

  According to the lens structure of the present invention, light incident directly below the critical angle from the light source and light not incident directly below the critical angle from the light source can be emitted as parallel light at the parallel bent lens portion. For this reason, the utilization efficiency of light is improved. In addition, the cross-sectional area of the parallel light beam emitted from the outer lens body can be increased. For this reason, the illumination range can be expanded and the illumination range can be illuminated brightly. Moreover, this lens structure can be comprised by the combination of an outer lens body and an inner lens body, and simplification of the whole structure can be achieved. Thereby, weight reduction and size reduction can be achieved, and the usage application is expanded. In addition, by using the inner lens body, it is possible to use light irradiated in a direction that cannot be used in the past, and light loss (loss) can be extremely reduced.

A Furnell lens can be used for the parallel bent lens portion of the outer lens body, and the parallel bent lens portion can be reliably configured, improving the reliability.

  Further, if the inner lens body is disposed independently of the outer lens body, there is an advantage that maintenance and inspection of the inner lens body and the outer lens body can be facilitated. That is, when one of the inner lens body and the outer lens body is damaged, the damaged one may be repaired or replaced, and the other can be used as it is.

  If the inner lens body is connected to the outer lens body, the number of parts can be reduced, and the assembling work can be simplified.

  According to another lens structure of the present invention, it is possible to emit, as parallel light, light that is directly incident on the critical angle or less from the light source and light that is not directly incident on the critical angle or less from the light source. For this reason, although there is a light loss (loss) compared to the inner lens body, the light utilization efficiency is relatively improved. In addition, since the parabolic reflector has a simpler configuration than the inner lens body, there is an advantage that it can be easily manufactured at low cost. Furthermore, the cross-sectional area of the formed parallel light flux can be increased, the illumination range can be expanded, and the illumination range can be illuminated brightly.

  In the case of having a diffusing lens portion, the illumination range can be made larger. For this reason, this lens structure is optimal for a luminaire (device) that needs to illuminate a relatively wide area.

  In the light source device of the present invention, most of the emitted light from the light source can be emitted as parallel light through the lens structure. For this reason, the utilization efficiency of the light from a light source can be improved, and bright illumination light can be obtained compared with the conventional product with the same light source. That is, when an illuminating device is configured using the plurality of light sources, the number of light sources may be small, and the cost can be reduced. In addition, the overall lighting device can be made compact.

  As a light source device, if the light source is a point light source arranged on the axis of the lens structure and the parallel light emitted from the lens structure is converged to a circular cross section, it is ideal for spot-like illumination It becomes. Further, if the light source is a linear light source and the parallel light emitted from the lens structure is converged on a rectangular cross section, it is optimal for a wide range of illumination.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

1 to 3 show a light source device according to a first embodiment of the present invention. This light source device parallels a light source 21 composed of a point light source 21a such as an LED (light emitting diode) and the radiated light from the light source 21a. And a lens structure 19 that emits light. The lens structure 19 includes an outer lens body 22 and an inner lens body 23 as the angle changing body 20. The outer lens body 22 and the inner lens body 23 are formed independently.

  The light source 21 a is disposed on the substrate 24, and an inner lens body 23 projects from the substrate 24 so as to surround the light source 21 a. The inner lens body 23 is configured by a ring body made of a translucent member. In this case, as shown in FIGS. 1 and 3, the inner lens body 23 has a tapered surface 23a whose outer diameter surface is reduced in diameter toward the opposite substrate side, and its distal end surface is reduced in diameter toward the substrate side. A tapered surface 23b is formed. In addition, the inner surface of the inner lens body 23 includes a convex curved surface 23c that is convex toward the inner diameter side, and a linear base surface 23d that is parallel to the axis O of the light source device. That is, the inner lens body 23 is composed of the thin base portion 25 and the main body portion 26 having a triangular cross section. In addition, as a translucent member formed in the inner lens body 23, synthetic resin, glass, or the like can be used.

  As shown in FIG. 1, the light L from the light source 21a is incident on the convex curved surface 23c of the inner lens body 23, thereby becoming the first bent light L1 in the main body 26 and the second bent light from the tapered surface 23a. The light is emitted as L2. In this case, the first bent light L1 is bent toward the axis O with respect to the light L incident on the convex curved surface 23c, and the second bent light L2 is bent toward the axis O with respect to the first bent light L1.

  The outer lens body 22 is also made of a translucent member, and is constituted by a disk-like body 31 that is parallel to the substrate 24 and the axis O passes through the center. A short cylindrical peripheral wall portion 32 extending from the substrate 24 is connected to the outer peripheral edge of the disk-shaped body 31. On the inner surface 31 a of the disk-shaped body 31, a large number of triangular ring bodies 27 having a triangular cross section are arranged as concentric circles, thereby forming a parallel bent lens portion 29 made up of a Furnell lens 30. The disc-like body 31 constituting the outer lens body 22 and the peripheral wall portion 32 are integrally formed to constitute the light source storage case 28. Further, as the translucent member formed on the outer lens body 22, synthetic resin, glass, or the like can be used.

  As described above, in the lens structure 19, the light L 0 incident on the outer lens body 22 through the opening 33 of the inner lens body 23 enters the Fullel lens 30 at a critical angle or less. Here, the critical angle is an angle reflected by the Fullel lens 30 when incident at an angle exceeding the critical angle. For this reason, light L0 (hereinafter sometimes referred to as direct light L0) incident on the outer lens body 22 through the opening 33 of the inner lens body 23 is converted into parallel light L01 parallel to the axis O by the outer lens body 22. And emitted.

  In addition, the light L (outside of the direct light L0) (outside the outer diameter) (light that enters the fullnel lens 30 beyond the critical angle) L enters the convex curved surface 23c of the inner lens body 23. Become. Therefore, as described above, the light L becomes the second bent light L2 and is emitted from the inner lens body 23. Then, the second bent light L2 enters the Furnell lens 30. In this case, the direct light L0 is incident on the inner fullernel lens 30a in the inner range H on the inner diameter side of the fullnel lens 30, and the second bent light L2 is on the outer fuller in the outer range H1 on the outer diameter side of the fullel lens 30. The light enters the flannel lens 30b. Further, the second bending light L2 incident on the inner Furnell lens 30a is less than the critical angle.

  The lens structure of the embodiment having the lens structure using only the outer lens body having the conventional Fullel lens shown in FIG. 11 without the inner lens body 23, and the inner lens body 23 and the outer lens body 22 is provided. This is shown in FIG. 4 for comparison. As can be seen from FIGS. 4B and 4C, the lens structure 19 according to the embodiment including the inner lens body 23 and the outer lens body 22 (described in FIG. 4A) is an inner lens body. The cross-sectional area of the parallel light beam A is larger by the outer range H1 than the one not having the value (the one shown in FIG. 4D). That is, when the diameter of the parallel light beam A1 shown in FIG. 4C is D and the diameter of FIG. 4B is D1, D1> D.

  As described above, in the present invention, the light that directly enters the critical angle or less from the light source 21a and the light that does not directly enter the critical angle or less from the light source 21a are emitted as parallel light by the parallel bending lens unit 29. it can. For this reason, the utilization efficiency of light is improved. In addition, the cross-sectional area of the parallel light flux A emitted from the outer lens body 22 can be increased. For this reason, the illumination range can be expanded and the illumination range can be illuminated brightly.

  The lens structure 19 can be configured by the combination of the outer lens body 22 and the inner lens body 23, and the overall configuration can be simplified. Thereby, weight reduction and size reduction can be achieved, and the usage application is expanded. In addition, by using the inner lens body 22, it is possible to use light irradiated in a direction that cannot be used conventionally, and light loss (loss) can be extremely reduced.

  Moreover, since the utilization efficiency of the light from the light source 21a can be improved, brighter illumination light can be obtained as compared with a conventional product having the same light source 21a. That is, when the lighting device is configured using the plurality of light sources 21, the number of light sources may be small, and the cost can be reduced. In addition, the overall lighting device can be made compact.

  If the light source 21a is a point light source arranged on the axis O of the lens structure 19 and the parallel light emitted from the lens structure 19 is converged on a circular cross section, it is optimal for spot-like illumination. Become. Further, since the Furnell lens 30 is used for the parallel bent lens portion 29 of the outer lens body 22, the parallel bent lens portion 29 can be reliably configured, and the reliability is improved.

  Since the inner lens body 23 is disposed independently of the outer lens body 22, there is an advantage that maintenance and inspection of the inner lens body 22 and the outer lens 23 are facilitated. That is, when one of the inner lens body 22 and the outer lens body 23 is damaged, the damaged one may be repaired or replaced, and the other can be used as it is.

  FIG. 5 shows a flashlight using the light source device shown in FIG. This flashlight is obtained by attaching a light source device shown in FIG. 1 to a tip of a bottomed cylindrical battery storage case 40. In this case, current is supplied from the battery 42 stored in the battery storage case 40 to the light source 21a, and the light source 21a emits light. Thereby, a parallel light flux A as shown in FIG. 4B is radiated from the outer lens body 22.

  In other words, the flashlight shown in FIG. 5 can improve the light use efficiency and can illuminate the illumination range brightly as compared with the flashlight using the same light source 21. be able to.

  Next, FIG. 6 shows a second embodiment. In this case, the inner lens body 23 is connected to the outer lens body 22. The inner lens body 23 is formed of a ring body having a flat triangular section, and protrudes from the inner surface 31a of the disk-shaped body 31 constituting the outer lens body 22 toward the substrate 24 side.

  Even in this case, the light L from the light source 21a is incident on the inner diameter surface 35 of the inner lens body 23 to become the first bent light L1 in the inner lens body 23, and from the outer diameter surface 36, the second bending light L1. The bent light L2 is emitted. That is, the first bent light L1 is bent toward the axis O with respect to the light L incident on the inner diameter surface 35, and the second bent light L2 is bent toward the axis O with respect to the first bent light L1.

  The light L0 from the light source 21a incident on the inner Flennel lens 30a (lens on the inner diameter side of the inner lens body 23) of the Frunnel lens 30 has a critical angle or less and is emitted as parallel light L01. Further, the light L incident on the inner diameter surface 35 of the inner lens body 23 is bent by the inner lens body 23 and enters the outer Fullel lens 30 b of the Fullel lens 30. This incident angle is equal to or less than the critical angle and is emitted as parallel light L3.

  For this reason, even the lens structure shown in FIG. 6 has the effects as shown in FIG. Further, since the inner lens body 23 is connected to the outer lens body 22, the number of parts can be reduced, and the assembling work can be simplified.

  In each of the above embodiments, the point light source 21a is used for the light source 21, but a linear light source 21b may be used for the light source 21, as shown in FIG. 7 showing the third embodiment. In this case, a U-shaped frame 51 having a front wall 50a and side walls 50b and 50c is provided. Then, by forming a pair of concave and convex portions 52, 52 along the longitudinal direction on the inner surface of the front wall 50a of the frame body 51, the Fullel lenses 30, 30 of the outer lens body 22 are formed. That is, the front wall 50 a constitutes the outer lens body 22 having the Furnell lenses 30 and 30. Note that both longitudinal openings of the frame 51 are closed by a lid wall (not shown).

  The inner lens body 23 shown in FIG. 7 is a flat horizontally elongated ring body having the same cross-sectional shape as the inner lens body 23 shown in FIG. That is, it includes a pair of long side portions 53 and 54 disposed along the longitudinal direction of the substrate 24 and an arc portion 55 that connects the end portions of the long side portions 53 and 54 in the longitudinal direction.

  For this reason, even in the light source device shown in FIG. 7, the light L from the light source 21b is incident on the convex curved surface 23c of the inner lens body 23 in the main body 26 as in the light source device shown in FIG. The first bent light L1 is emitted, and the second bent light L2 is emitted from the tapered surface 23a.

  Therefore, the light L0 incident on the outer lens body 22 through the opening 33 of the inner lens body 23 is incident on the Furnell lens 30 at a critical angle or less. Further, the light L outside the direct light L0 (light that enters the fullnel lens 30 beyond the critical angle) L is emitted from the inner lens body 23 as the second bent light L2. Then, the second bent light L2 is incident on the Furnell lens 30 at a critical angle or less.

  Also in the light source device shown in FIG. 7, the light L0 that is directly incident below the critical angle from the light source 21b and the light that is not directly incident below the critical angle from the light source 21b are emitted as parallel light by the parallel bending lens unit 29. Can do. For this reason, the utilization efficiency of light is improved. The illumination range can be expanded and the illumination range can be illuminated brightly. In particular, the light source 21 is a line light source 21b, and the parallel light emitted from the lens structure 19 is converged on a rectangular cross section, which is optimal for a wide range of illumination.

  Next, FIG. 8 which shows 4th Embodiment equips the outer surface 31b of the disk-shaped body 31 which comprises the outer lens body 22 with the diffused lens part 62. FIG. That is, as shown in FIG. 9, this diffusing lens portion 62 can be formed by forming a plurality of radial grooves 63 on the outer surface 31 b of the disk-shaped body 31. Thereby, an illumination range can be enlarged more. For this reason, this lens structure is optimal for a lighting fixture or the like that needs to illuminate a relatively wide area.

  Next, FIG. 10 showing the fifth embodiment uses a parabolic reflecting mirror 60 as the angle changing body 20. That is, the parabolic reflecting mirror 60 is housed in the housing case 28 constituting the outer lens body 22, and the light L incident on the inner diameter reflecting surface 61 is reflected to form parallel light L4. In this case, the parallel light L4 is incident on the outer lens body 22 outside the Furnell lens 30, and the parallel light L4 is maintained as it is without being bent by the outer lens body 22, as shown in FIG. As shown in b), the light beam is emitted from the outer lens body 22 as a parallel light beam A.

  For this reason, even in the light source device shown in FIG. 10, the light L0 incident directly below the critical angle from the light source 21a and the light L not incident directly below the critical angle from the light source can be emitted as parallel light. it can. Note that light in the range of θ3 cannot be used as compared with the one using the inner lens body 23, but the light use efficiency is sufficiently improved as compared with the case where the parabolic reflecting mirror 60 is not used. In addition, since the parabolic reflector 60 has a simpler configuration than the inner lens body 23, there is an advantage that it can be easily manufactured at low cost. Furthermore, the cross-sectional area of the formed parallel light flux A can be increased, the illumination range can be expanded, and the illumination range can be illuminated brightly. Further, since the reflected light is reflected by the parabolic reflecting mirror 60 and becomes the parallel light L4, it is not necessary to form a fullnel lens on which the reflected light is incident on the outer lens body 22, and the outer lens body 22 There is an advantage that processability is improved.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the light source 21 is an incandescent bulb, a halogen bulb, or the like in addition to the LED. Various incandescent lamps, discharge lamps such as fluorescent lamps and bulb-type fluorescent lamps can be used. Moreover, when using LED, various things, such as red, blue, green, can be used as a color to light-emit. Furthermore, if the outer lens body 77 is colored, the color of the emitted parallel light flux A can be changed. 6, 8, 10, etc. can be used for a flashlight as shown in FIG. 5, and the light sources shown in FIGS. 6, 7, 8, 10, etc. Even if it is an apparatus, you may provide the diffusion lens part 62. FIG.

  The light source device of each embodiment can be used for various lighting fixtures such as interior lights, table lamps, chandeliers, and pen lights, and indicator lamps (display boards) that display various characters and symbols. . Furthermore, it can be used for a side light, a direction indicator, an auxiliary direction indicator, an emergency flashing indicator light, and the like attached to a vehicle, and can also be used for a warning light of an emergency vehicle. Thus, it can be employed in various lighting fixtures, warning lights, and the like, and when employed in these, these various functions can be exhibited effectively and energy saving can be achieved.

  Moreover, when comprising a lighting fixture or a warning lamp, you may use one light source device or a several light source device. When using a plurality of light source devices, the same number of light source devices may be used, or the light source device shown in FIG. 1 may be combined with another different light source device shown in FIG. 6, for example. Further, as the light source device, the size, shape, thickness and the like of the outer lens body 22 and the like can be arbitrarily changed. For this reason, when using a some light source device, you may combine what differs in a magnitude | size, a shape, thickness, etc.

It is sectional drawing of the light source device which shows 1st Embodiment of this invention. It is a front view of the light source device of the said FIG. It is a cross-sectional perspective view of the light source device of FIG. FIG. 2 is a comparative view of the light source device of FIG. 1 and a conventional light source device. It is sectional drawing which shows the usage example of the light source device of the said FIG. It is sectional drawing of the light source device which shows 2nd Embodiment of this invention. It is sectional drawing of the light source device which shows 3rd Embodiment of this invention. It is sectional drawing of the light source device which shows 4th Embodiment of this invention. It is a front view of the light source device of the said FIG. 5 shows a fifth embodiment of the present invention, in which (a) is a cross-sectional view of the light source device, and (b) is a cross-sectional view of parallel light beams of the light source device. The prior art example of this invention is shown, (a) is sectional drawing of this light source device, (b) is sectional drawing of the parallel light beam of this light source device. The other conventional example of this invention is shown, (a) is sectional drawing of this light source device, (b) is sectional drawing of the parallel light beam of this light source device. FIG. 2 shows another conventional example of the present invention, in which (a) is a cross-sectional view of the light source device, and (b) is a cross-sectional view of parallel light beams of the light source device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 19 Lens structure 21 Light source 21b Light source 21a Point light source 21b Line light source 22 Outer lens body 23 Inner lens body 29 Parallel bending lens part 30 Furnell lens 60 Parabolic reflecting mirror 61 Inner diameter reflecting surface 62 Diffusing lens part

Claims (9)

  An outer lens body having a parallel bent lens portion that emits light incident below the critical angle as parallel light, and bending light that exceeds the critical angle outside the light directly incident on the parallel bent lens portion below the critical angle. A lens structure comprising: an inner lens body that causes the bent light to be incident on the parallel bent lens portion at a critical angle or less outside the light incident at a critical angle or less.   2. The lens structure according to claim 1, wherein a fullnel lens is used for the parallel bent lens portion of the outer lens body.   The lens structure according to claim 1 or 2, wherein the inner lens body is disposed independently of the outer lens body.   3. The lens structure according to claim 1, wherein the inner lens body is connected to the outer lens body.   An outer lens body having a parallel bent lens portion that emits light incident below the critical angle as parallel light, and light that exceeds the critical angle outside the light directly incident on the parallel bent lens portion below the critical angle is reflected. A lens structure comprising: a paraboloid reflecting mirror that converts the reflected light into parallel light outside the light incident at a critical angle or less.   6. The lens structure according to claim 1, wherein the outer lens body includes a diffusing lens portion that diffuses parallel light.   A light source device comprising: a light source; and a lens structure that emits radiated light from the light source as parallel light, wherein the lens structure according to any one of claims 1 to 6 is used for the lens structure.   The light source device according to claim 7, wherein the light source is a point light source disposed on an axis of the lens structure, and parallel light emitted from the lens structure is converged on a circular cross section.   The light source device according to claim 7, wherein the light source is a line light source, and parallel light emitted from the lens structure is converged on a rectangular cross section.

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