JP2014013350A - Illuminating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illuminating device able to emit uniform light to a subject while restricting increases in cost and size of a device.SOLUTION: An illuminating device comprises: a light source; and a light guide member configured to guide light emitted from the light source and emit it toward a subject. The light source has a first area and a second area in the longitudinal direction of a light emission area and is arranged such that the first area is not opposite the light guide member and the second area is opposite the light guide member. The light guide member includes: an emission face to which light emitted from the second area of the light source is made incident; a first alternation part by which the traveling direction of light made incident on the incident face is altered; a second alteration section by which the traveling direction of light whose traveling direction is altered by the first alteration part is altered to a direction toward the subject; and an emission face by which light whose traveling direction is altered by the second alteration part is emitted toward the subject.

Description

  The present invention relates to an illuminating device that can emit light in association with photographing by an imaging device.

  2. Description of the Related Art Some imaging devices such as digital still cameras have a function (macro shooting function) capable of shooting a subject at a very close distance from a shooting lens.

  When the illumination apparatus emits light in association with such macro photography function (hereinafter referred to as macro photography), the subject is uniformly irradiated with light so that unnecessary shadows do not occur on the subject. It is preferable. Therefore, an external strobe has been proposed as an illumination device that can irradiate light suitable for macro photography, and has a ring-shaped light emitting portion, and the ring-shaped light emitting portion can be attached around the tip of the lens barrel. (See Patent Document 1).

  In Patent Document 1, as shown in FIG. 9, arc-shaped xenon (Xe) tubes 14 and 15 are arranged on the left and right to form a ring shape.

JP 2001-215574 A

  However, with an external strobe as proposed in Patent Document 1, it is difficult to accurately perform a process of bending a cylindrical glass tube such as a xenon tube into an arc shape, resulting in poor manufacturing yield and high cost. There was a problem of becoming.

  SUMMARY An advantage of some aspects of the invention is that it provides a lighting device that can irradiate a subject with uniform light while suppressing cost and an increase in size of the device.

  In order to achieve the above object, an illumination device according to the present invention is a lighting device including a light source and a light guide member that guides light emitted from the light source and emits the light toward an object side. The light source has a first region and a second region in a longitudinal direction of a light emitting region, the first region and the light guide member do not face each other, and the second region and the light guide member Are arranged so as to face each other, and the light guide member includes an incident surface on which light emitted from the second region of the light source is incident, and a first direction that changes a traveling direction of the light incident on the incident surface. A changing unit, a second changing unit that changes the traveling direction of the light whose traveling direction has been changed by the first changing unit to a direction toward the object side, and a traveling direction that is changed by the second changing unit And an exit surface for emitting the emitted light to the object side.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can irradiate a to-be-photographed object uniformly can be provided, suppressing cost and the enlargement of an apparatus.

1 is a cross-sectional view showing a configuration of an optical system of a lighting device according to a first embodiment of the present invention. Sectional drawing explaining the light beam inject | emitted from the optical system of the illuminating device which concerns on the 1st Embodiment of this invention. Explanatory drawing of the structure which applied the optical system of the illuminating device which concerns on the 1st Embodiment of this invention to the ring light. The figure which shows the light emission distribution of the structure which applied the optical system of the illuminating device which concerns on the 1st Embodiment of this invention to the ring light. The figure which shows the irradiation state to the short distance plane of the structure which applied the optical system of the illuminating device which concerns on the 1st Embodiment of this invention to the ring light. Sectional drawing which shows the structure of the optical system of the illuminating device which concerns on the 2nd Embodiment of this invention. Sectional drawing explaining the light beam inject | emitted from the optical system of the illuminating device which concerns on the 2nd Embodiment of this invention. 1 is an overall view of a ring light to which an optical system of an illumination device according to a first embodiment of the present invention is applied. Explanatory drawing of the structure of the conventional ring light. The figure which shows the light emission distribution in the conventional ring light.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)
Hereinafter, with reference to FIGS. 1-5, the illuminating device which concerns on the 1st Embodiment of this invention is demonstrated. In addition, since the optical system of the present embodiment has a symmetrical shape at the center in the longitudinal direction of the light source 1, the cross-sectional views of the optical system shown in FIGS. It has become.

  First, the configuration of each part will be described based on the cross-sectional view showing the configuration of the optical system in FIG.

  The light source 1 is a cylindrical light source such as a xenon light-emitting discharge tube or a cold cathode tube. Circuit components necessary for light emission such as a trigger coil (not shown) and a main capacitor are electrically connected to the light source 1 so that the light source 1 emits light. The light source 1 may be configured by arranging a plurality of LEDs in an equivalent range instead of a cylindrical light source such as a xenon light-emitting discharge tube or a cold cathode tube.

  The light guide member 2 is made of a transparent resin material that transmits light, such as an acrylic material. The light guide member 2 guides light emitted from the light source 1 and emits it toward the object scene side at a position shifted from the light source 1. Is. The light guide member 2 is provided with an incident surface 2a, a first traveling direction changing surface 2b, a second traveling direction changing surface 2c, and an exit surface 2d. The incident surface 2 a is a surface that is disposed so as to face a part of the light source 1, and allows light emitted from the light source 1 to enter.

  The first traveling direction changing surface (first changing portion) 2b is a surface whose surface is mirror-finished with a metal vapor deposition film such as aluminum vapor deposition or silver vapor deposition, and reflects all light incident on this surface. , Change the traveling direction of light.

  The second advancing direction changing surface (second changing unit) 2c reflects the light reflected by the first advancing direction changing surface 2b and changed in the advancing direction in the exit surface 2d direction (the direction toward the object side). This is a surface on which a prism portion having an effect of reflecting light is formed. Here, the detail of the characteristic of the 2nd advancing direction change surface 2c is described. A plurality of continuous prism portions are formed on the second traveling direction changing surface 2c so as to face an exit surface 2d described later. The prism part includes a total reflection surface and a re-incidence surface, and travels in the light guide member 2 and only light having an angle component within a predetermined range among the light that reaches one total reflection surface of the prism part. The total reflection surface is totally reflected toward the exit surface 2d. On the other hand, light other than the angular component in a predetermined range that is not totally reflected by the total reflection surface is refracted by the prism portion and emitted once out of the light guide member 2, and then again through the re-incident surface of the adjacent prism portion. The light enters the light guide member 2.

  In addition, as shown in FIG. 1, the prism portion has a thickness that is gradually reduced in the direction orthogonal to the exit surface 2d toward the traveling direction of the light reflected by the first traveling direction changing surface 2b. .

  The exit surface 2d is a surface on the object side, which is emitted from the light source 1, passes through the light guide member 2, and emits the light whose direction of travel is changed by the second travel direction changing surface 2c to the object side. It is a surface to do.

  Details of how the light emitted from the light source 1 is guided to the object side will be described later with reference to FIG.

  The reflecting plate 3 is for reflecting light emitted from the inside of the cylindrical light source 1 in all directions and directing the light emitted from the light source 1 toward the object field side and the light guide member 2 side.

  Next, main light beams emitted from the light source 1 in the configuration of the optical system of the present embodiment will be described with reference to FIG.

  FIGS. 2A and 2B are diagrams for explaining main light fluxes of light emitted from the light source 1 and not directly incident on the light guide member 2 but directly emitted to the object field side. It is.

  FIG. 2A is a diagram illustrating a state in which a part of the light emitted from the light source 1 is directly emitted to the object side. As shown in FIG. 2A, since the light guide member 2 is not provided in front of the light source 1, when applied to an actual lighting device, it is covered with a component such as a cover plate made of a transparent resin member, and the user can It is preferable that the light source 1 is not touched directly.

  FIG. 2B shows that a part of the light emitted from the light source 1 does not enter the inside of the light guide member 2 and is reflected by the first traveling direction changing surface 2b of the light guide member 2 to be reflected in the object field. It is a figure which shows a mode that it injects to the side. As shown in FIG. 2 (b), when the light emitted from the vicinity of the central portion (first region) in the longitudinal direction of the light source 1 has an incident angle on the first traveling direction changing surface 2b of a predetermined angle or more, Reflected by the first traveling direction changing surface 2b. As a result, light emitted from the vicinity of the central portion of the light source 1 is condensed around the central portion, so that efficient light distribution can be achieved.

  FIGS. 2C and 2D show main light fluxes of light emitted from the light source 1 and incident on the light guide member 2 from the incident surface 2a of the light guide member 2 and emitted to the object side. FIG.

  FIG. 2C is a diagram illustrating a state in which a part of the light emitted from the light source 1 is incident on the incident surface 2a of the light guide member 2 and is reflected by the first traveling direction changing surface 2b. As shown in FIG. 2C, the light reflected by the first traveling direction changing surface 2b is guided toward the second traveling direction changing surface 2c and reflected by the second traveling direction changing surface 2c. Then, the light is emitted from the exit surface 2d toward the object side. Here, the second advancing direction changing surface 2c is composed of the plurality of continuous prism portions described above, and the light incident on the prism portion at a predetermined angle like the light ray n shown in FIG. Totally reflected and emitted from the exit surface 2d. Further, like the light beam m in FIG. 2C, the light that is not totally reflected by the prism portion is refracted by one prism portion and once guided out of the light guide member 2, and then the light of the adjacent prism portion. The light enters the light guide member 2 again through the re-incident surface.

  Moreover, as shown in FIG.2 (c), it turns out that the part which functions as a light emission point concentrates on the trough part vicinity (a part of total reflection surface) of each prism part of the 2nd advancing direction change surface 2c. . This is because, as shown in FIG. 2 (c), the plurality of continuous prism portions of the second traveling direction changing surface 2c are stepped steps. Therefore, the light emitted from the exit surface 2d has a feature that light emitting points are formed at intervals depending on the pitch A (mm) of the plurality of prism portions.

  FIG. 2D is a diagram showing a light beam in which a part of the light emitted from the light source 1 enters the incident surface 2 a of the light guide member 2 and is emitted from the exit surface 2 d via the light guide member 2. is there. As shown in FIG. 2 (d), the light emitted from the light source 1 is refracted by the incident surface 2a and the exit surface 2d of the light guide member 2 and is emitted to the object side.

  As described above, the main light beams emitted from the light source 1 and the light guide member 2 shown in FIGS. 2A to 2D can constitute a light source having a uniform and wide light emitting surface.

  Next, the numerical value which determines each preferable shape is demonstrated.

The angle α formed with the incident surface 2a of the first traveling direction changing surface 2b of the light guide member 2 shown in FIG. 1 is preferably set to a value that satisfies the relationship of the following expression 1.
45 ° ≦ α ≦ 65 ° ・ ・ ・ Equation 1
The light emitted from the light source 1 is reflected by the first traveling direction changing surface 2b, and if the angle α is small, the effect of reflecting the light from the light source 1 and condensing it in the vicinity of the center decreases, and the uniform light emitting surface do not become. Therefore, the lower limit angle at which the effect of condensing light near the center is sufficiently obtained is set to 45 °.

  In addition, light emitted from the light source 1 enters the incident surface 2a of the light guide member 2 and is reflected by the first traveling direction changing surface 2b, and if the angle α is large, the first traveling direction changing surface. The amount of light traveling toward the second traveling direction changing surface 2c is reduced by the reflection of 2b, and a uniform light emitting surface is not obtained. Therefore, the upper limit angle at which the amount of light traveling toward the second traveling direction changing surface 2c can be sufficiently obtained by the reflection of the first traveling direction changing surface 2b is set to 65 °.

Next, the angle β formed with the exit surface 2d of the second traveling direction changing surface 2c of the light guide member 2 shown in FIG. 2 is preferably set to a value that satisfies the relationship of the following Expression 2.
30 ° ≦ β ≦ 45 ° ・ ・ ・ Equation 2
When an optical resin material generally used for an illumination optical system is used, when the angle β exceeds 45 °, the number of light rays totally reflected by the total reflection surface of each prism portion is extremely reduced. That is, the number of light beams emitted from the exit surface 2d shown in FIG. 2C is extremely reduced. In addition, the number of refractions increases as the total reflection is reduced, and the amount of light loss due to surface reflection accompanying incident / exit to the light guide member 2 is extremely increased, so that a desirable optical system cannot be obtained. Further, when the angle β is 30 ° or less, the angle of the emitted light beam with respect to the exit surface 2d shown in FIG.

Next, the pitch A (mm) of the plurality of prism portions formed on the second traveling direction changing surface 2c of the light guide member 2 may be set to a value within a range that satisfies the relationship of Expression 3 below. preferable.
0.2 ≦ A ≦ 4.0 Formula 3
When the pitch A is 0.2 mm or less, the influence of the R surface near the apex of the prism portion formed when the second traveling direction changing surface 2c is formed becomes large, and the incident light flux of the second traveling direction changing surface 2c has. The function of separation and total reflection according to the angle cannot be effectively exhibited. In addition, if a forming method capable of reliably forming the edge of such a fine prism portion is used, the manufacturing cost of the second traveling direction changing surface 2c becomes very expensive, which is not practical. .

  On the other hand, on the second advancing direction changing surface 2c, as described above, the light emission points are concentrated on the ridge line portion (near the valley portion of the prism portion) corresponding to the pitch A. In other words, when the pitch A of the ridge portion is wide, the number of light emitting points is reduced, and the light emission intensity of each light emitting point is increased. From this point of view, the reason why the pitch A is set to 4.0 mm or less is that, as an illumination optical system for macro photography, it is suitable that the light emission amount at each light emission point is small and the number of light emission points is large. As another reason, the fact that the pitch becomes wider means that the thickness of the second traveling direction changing surface 2c is increased, which is not desirable from the viewpoint of miniaturization. Here, if the light guide member 2 is formed so as to have a large thickness, it is convenient for obtaining uniform light distribution characteristics, but the thickness of the second traveling direction changing surface 2c becomes thicker than necessary. The disadvantage of increasing the size of the member arises.

  In addition, the numerical value illustrated above was determined as a numerical value for forming an optimal optical system when the width in the longitudinal direction of the light source 1 and the width of the light emitting surface including the width of the emission surface 2d are constant. Is. However, by appropriately setting the width in the longitudinal direction of the light source 1 and the width of the light emitting surface, it is not limited to the numerical range exemplified above, and can be set to other numerical ranges. .

  FIG. 3 is a diagram illustrating a configuration when the optical system according to the present embodiment is applied to an illumination device having an approximately circular exit surface (hereinafter referred to as a ring light). The ring light of FIG. 3 can be attached to a lens barrel or the like so as to surround the lens barrel of the imaging apparatus. Also, as shown in FIG. 3, a pair of light sources 1 are arranged symmetrically with respect to a point O that is the center of a circular ring light. A light guide member 2 is disposed on a circumference overlapping with the pair of light sources 1. Two light guide members 2 are arranged in each light source 1, and two different light guide members 2 have the incident surfaces 2 a facing the vicinity of the end in the longitudinal direction of the light source 1 (second region). It arrange | positions so that a part of light emitted from the light source 1 may be light-guided. That is, two light guide members different from each other in the vicinity of both ends in the longitudinal direction of the light source 1 are arranged to face each other. As shown in FIG. 3, the light guide member 2 has an arc shape in which a cross section parallel to the longitudinal direction of the light source 1 is bent along a circle centered on the point O.

  The ring light main body 4 holds the light source 1, the light guide member 2, and the reflection plate 3 with a holding member or the like shown in the figure. Although not shown here, when applied to a ring light, a cover member such as a diffusing plate or a transparent acrylic plate is disposed facing the object side surface of the exit surface 2d of the light guide member 2. It is preferable that the photographer does not touch the light source 1 or the light guide member 2 directly.

  In FIG. 3, a space is provided between the left light guide member 2 and the right light guide member 2, but the left light guide member 2 and the right light guide member 2 may be adjacent to each other. It is. The conventional ring light shown in FIG. 9 has terminals to which lead wires for supplying energy for causing the xenon tubes to emit light are connected to both ends of the xenon tubes 14 and 15, respectively. A holding member for holding the xenon tubes 14 and 15 is provided. Therefore, the light emission region of the xenon tube 14 and the light emission region of the xenon tube 15 cannot be adjacent to each other, and a sufficient amount of light can be obtained in the region between the xenon tube 14 and the xenon tube 15 (upper and lower portions in FIG. 9). It is possible that there is not. On the other hand, in the ring light shown in FIG. 3, it is not necessary to bring the pair of light sources 1 close to each other when the left light guide member 2 and the right light guide member 2 are adjacent to each other. Easy to do.

  FIG. 8 is an overall view of a ring light to which the optical system according to this embodiment is applied. The ring light main body 4 described above is connected to the control unit main body 10 by a cable 20. Actually, it is preferable to cover the light source 1 and the light guide member 2 with a component such as a cover plate made of a transparent resin member so that the user cannot directly touch the light source 1, but the position of the light source 1 and the light guide member For easy understanding of the shape, FIG. 8 shows a state where it is not covered with a cover plate.

  Inside the control unit main body 10, there are a main capacitor for storing electric energy for causing the light source 1 to emit light, a battery storage unit for storing a battery for charging the main capacitor, a control unit for controlling light emission of the light source 1, and the like. Is provided. The cable 20 transmits the electrical energy accumulated in the control unit main body 10 to the ring light main body 4. Note that the ring light shown in FIG. 8 is an example, and a configuration in which an electronic component related to light emission such as a main capacitor is mounted on the ring light main body without including the control unit main body and the cable may be used.

  4 is a diagram of the light distribution in the ring light to which the optical system shown in FIG. 3 is applied, and shows the light distribution in the zx plane and the yz plane corresponding to the xyz axial direction shown in FIG. ing. In addition, the value of 0-90 in FIG. 4 represents the angle with respect to the axis | shaft (typical irradiation optical axis) of the Z direction which passes the point O shown in FIG. Also, the values of 3-1 to -1 in FIG. 4 represent relative values based on the emission intensity on the axis in the Z direction passing through the point O. For example, if the value is -1, Z passing through the point O This means that the emission intensity is one step lower than the direction axis.

  The light distribution distribution shown in FIG. 4 has a narrow light distribution range as compared with FIG. 10 showing the light distribution of the ring light of the conventional example described with reference to FIG. For example, the light distribution range required for the shooting angle of view at the time of macro shooting is about 30 ° with respect to a typical irradiation optical axis, and the light distribution shown in FIG. 4 is the conventional light distribution shown in FIG. It is more suitable for macro photography than the light distribution range of the ring light.

  In addition, since the optical system of the present embodiment has a narrower light distribution range than the ring light of the conventional example, the light distribution range of the optical system of the present embodiment is larger than that of the conventional ring light when the same light source is used. The inside emission intensity is large.

  As described above, the optical system of the present embodiment can irradiate the subject with uniform light more efficiently than the conventional ring light.

  FIG. 5 is a diagram illustrating an irradiation state when a plane (short-distance plane) close to the exit surface 2d of the light guide member 2 is irradiated. As shown in FIG. 5, the light irradiated to the near plane is substantially uniform, and if the configuration of the optical system of the present embodiment is applied, it is unnecessary for the subject at the time of macro photography while suppressing the cost and the enlargement of the apparatus. It is possible to irradiate the subject uniformly with light so as not to cause a shadow.

(Second Embodiment)
Hereinafter, with reference to FIG. 6, FIG. 7, the illuminating device which concerns on the 2nd Embodiment of this invention is demonstrated. In the present embodiment, the description of the same part as that in the first embodiment will be omitted, and the different part will be described.

  FIG. 6 is a cross-sectional view showing the configuration of the optical system of the present embodiment. Like the light guide member 2 of the first embodiment, the light guide member 5 is made of a transparent resin material that transmits light, such as an acrylic material, and guides light emitted from the light source 1 to light source 1. It is for emitting from the position where no exists to the object side. Specifically, the light guide member 5 causes the light emitted from the light source 1 to enter from the incident surface 5a, the first traveling direction changing surface (first changing portion) 5b, the second traveling direction changing surface ( The light is emitted from the exit surface 5d to the object side via the second change unit 5c. Unlike the first embodiment, the first traveling direction changing surface 5b includes a total reflection surface that totally reflects light having an angle included in a predetermined range among light incident from the incident surface 5a of the light guide member 5. It functions as a refracting surface that transmits and refracts light having an angle not included in a predetermined range and emits the light toward the object side.

  FIG. 7 is a cross-sectional view for explaining main light beams emitted from the light source 1 in the configuration of the optical system of the present embodiment.

  FIG. 7A is a diagram for explaining main light fluxes of light emitted from the light source 1 and not directly entering the light guide member 5 but directly emitted to the object side. As shown in FIG. 7A, light emitted from the vicinity of the central portion (first region) in the longitudinal direction of the light source 1 is emitted to the object side without passing through the light guide member 5.

  FIGS. 7B and 7C show main light fluxes of light emitted from the light source 1 and incident on the light guide member 5 from the incident surface 5a of the light guide member 5 and emitted to the object side. FIG.

  FIG. 7B is a diagram illustrating a state in which a part of the light emitted from the light source 1 is incident on the incident surface 5a of the light guide member 5 and reflected by the first traveling direction changing surface 5b. As shown in FIG. 7B, a part of the light emitted from the light source 1 is incident on the incident surface 5a of the light guide member 5 at an angle included in a predetermined range on the first traveling direction changing surface 5b. When incident, the light is totally reflected by the first traveling direction changing surface 5b and guided toward the second traveling direction changing surface 5c.

  FIG. 7C is a diagram illustrating a state in which a part of the light emitted from the light source 1 enters the light guide member 5 and is transmitted through the first traveling direction changing surface 5b. As shown in FIG. 7C, a part of the light emitted from the light source 1 is incident on the incident surface 5a of the light guide member 5, and the first traveling direction changing surface 5b is not included in a predetermined range. , The light is refracted and transmitted, and emitted toward the object side.

  Next, numerical values for determining preferable shapes will be described.

The angle γ formed with the incident surface 5a of the first advancing direction changing surface 5b of the light guide member 5 shown in FIG.
25 ° ≦ γ ≦ 60 ° ・ ・ ・ Equation 4
The light emitted from the light source 1 enters the incident surface 5a of the light guide member 5 and is reflected by the first traveling direction changing surface 5b. If the angle γ is small, the first traveling direction changing surface 5b Less light is reflected. For this reason, the amount of light traveling toward the second traveling direction changing surface 5c is reduced, and a uniform light emitting surface is not obtained. Therefore, the angle at which a sufficient amount of light traveling toward the second traveling direction changing surface 5c can be obtained by the total reflection of the first traveling direction changing surface 5b is set to 25 °.

  In addition, the light emitted from the light source 1 is incident on the incident surface 5a of the light guide member 5 and reflected by the first traveling direction changing surface 5b. The light is emitted from the emission surface 5d without going to the traveling direction changing surface 5c, and does not become a uniform light emitting surface. Accordingly, the angle at which a sufficient amount of light is reflected from the first traveling direction changing surface 5b and then directed to the second traveling direction changing surface 5c without going to the exit surface 5d is set to 60 °.

  The numerical values exemplified above are determined as numerical values for forming an optimal optical system when the width of the light source 1 in the longitudinal direction and the width of the light emitting surface including the width of the emission surface 5d are constant. Is. However, by appropriately setting the width in the longitudinal direction of the light source 1 and the width of the light emitting surface, it is not limited to the numerical range exemplified above, and can be set to other numerical ranges. .

  As described above, also in the present embodiment, the central intensity is increased and the subject can be efficiently irradiated by condensing the light in a necessary field angle range as compared with the conventional ring light. In addition, it is possible to irradiate the subject uniformly with light so as not to cause unnecessary shadows on the subject at the time of macro photography while suppressing cost and size increase of the apparatus.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  For example, in the above-described two embodiments, the example in which the present invention is applied to a ring light has been described.

  For example, in the above-described two embodiments, the example in which the light source is applied to a pair of ring lights has been described. However, the present invention can also be applied to an illumination device having one light source or three or more light sources.

  Further, for example, in the above-described two embodiments, the example in which the optical system has a bilaterally symmetric shape at the longitudinal center of the light source 1 has been described. However, the present invention can also be applied to an illumination device having an optical system that is not bilaterally symmetric. It is.

DESCRIPTION OF SYMBOLS 1 Light source 2 Light guide member 3 Reflector 4 Ring light main body 5 Light guide member 10 Control part main body

Claims (8)

A light source;
A light guide member that guides light emitted from the light source and emits the light to the object side;
A lighting device comprising:
The light source is
A first region and a second region are provided in the longitudinal direction of the light emitting region, the first region and the light guide member do not face each other, and the second region and the light guide member face each other. Arranged as
The light guide member is
An incident surface on which light emitted from the second region of the light source is incident;
A first changing unit that changes a traveling direction of light incident on the incident surface;
A second changing unit that changes the traveling direction of the light whose traveling direction has been changed by the first changing unit to a direction toward the object side; and
An illuminating device comprising: an exit surface that emits the light whose traveling direction has been changed by the second changing unit toward the object side.   The first changing unit changes a traveling direction of light emitted from the first region of the light source and reaching the first changing unit without entering the incident surface to a direction toward the object side. The lighting device according to claim 1, wherein:   The said 1st change part reflects the light emitted from the said 1st area | region of the said light source, and reaching the said 1st change part, without entering into the said entrance plane. Lighting equipment.   The first changing unit changes the traveling direction of the light incident on the incident surface and reaching the first changing unit at an angle included in the predetermined range in a direction toward the second changing unit. 2. The traveling direction of light incident on the incident surface and reaching the first changing portion at an angle not included in the predetermined range is changed to a direction toward the object side. The lighting device described in 1.   The first changing unit reflects light that has entered the incident surface and reaches the first changing unit at an angle included in the predetermined range, and is incident on the incident surface and included in the predetermined range. The illuminating device according to claim 4, wherein the light that has reached the first changing unit is transmitted at an angle that cannot be transmitted.   The said light source has the said 1st area | region in the longitudinal direction center part of the said light emission area | region, and has the said 2nd area | region in the longitudinal direction edge part vicinity of the said light emission area | region. The illumination device according to any one of the above.   The light source has the second region in the vicinity of both ends in the longitudinal direction of the light emitting region, and is arranged so that two light guide members different from each of the second regions face each other. The lighting device according to any one of claims 1 to 6. The lighting device according to any one of claims 1 to 7, wherein the light guide member has an arc shape in a cross section parallel to a longitudinal direction of the light emitting region.