JP2006171291A - Illumination device and photographic device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an illumination device for AF auxiliary light or the like, necessary for a camera for photographing, which realizes high illumination efficiency, and to provide a photographic device that uses the same. <P>SOLUTION: In the illuminating device having a light source means, and an optical member and a reflecting member for radiating luminous flux from the light source means toward a subject, the light source means whose edge is dome-shaped and whose terminal part is positioned on an opposite side to the dome is arranged perpendicular to a radiation optical axis. At least either the luminous flux, which has been refracted by a 1st incident surface or the luminous flux which has been refracted by a 2nd incident surface and totally reflected on a total reflection surface among the emitted luminous fluxes from the center of the optical axis, is regulated so as to be nearly parallel with the optical axis at least on one cross section passing through the center of the light source of the light source means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera illumination device, and more particularly to a camera illumination device that effectively projects light emitted from a light source.

  2. Description of the Related Art Conventionally, an illumination device for a camera, for example, an illumination device used for irradiation of auxiliary light for autofocus (AF), includes a light-emitting lamp having a light-emitting source, a casing that holds the light-emitting lamp, and a light-emitting source of the light-emitting lamp. And a reflecting mirror that reflects the emitted light.

  In addition, since a so-called flashlight type lighting device has a long depth, there is a type in which a light emitting lamp is placed perpendicular to the optical axis.

  Among such illuminating devices, various types of illuminating devices have been conventionally proposed in which light beams emitted in various directions from a light source are condensed in a required and small angle of view efficiently.

  In particular, in place of the Fresnel lens that has been arranged on the front side (subject side) of the light source in recent years, an optical member using total reflection such as a prism and a light guide is arranged as disclosed in Patent Document 1, for example. By doing so, the thing which aimed at the improvement of condensing efficiency and size reduction is proposed.

Patent Document 2 proposes an illumination device that uses a light-emitting lamp as a light source, in which the terminal portion of the light source member is located rearward on the optical axis.
Japanese Patent Laid-Open No. 02-135605 JP 11-174534 A

  However, in many illumination devices of this type, a light-emitting lamp is used as the light source, and the terminal portion of the light source member is located on the rear side on the optical axis as seen in the back of Patent Document 2. Therefore, the depth direction has become larger.

  Further, in the type in which the above-described light emitting lamp is placed perpendicular to the optical axis, only the reflecting mirror has a cylindrical shape, and light cannot be irradiated efficiently.

  In addition, the method for fixing the cylindrical reflecting mirror and the position adjustment of the light emitting lamp were not described.

  Accordingly, in order to achieve the above object, the present invention includes a light source means, an optical member for irradiating a light beam from the light source means in the direction of the subject, and a reflecting member. In the illumination device in which the light source means has a dome shape at the tip and the terminal portion is located on the opposite side of the dome, and is arranged perpendicular to the irradiation optical axis, in at least one cross section passing through the light source center of the light source means, Of the emitted light beam from the center of the optical axis, at least one after being refracted by the first incident surface or after being refracted by the second incident surface and totally reflected by the total reflection surface is substantially parallel to the optical axis. It is characterized by being regulated as follows.

In order to achieve the above object, according to the invention described in claim 2 of the present application, in the illumination device according to claim 1, the diameter of the light source means is φ, and the minimum distance from the first incident surface is d. , Where e is the minimum distance from the second incident surface.
φ / 10 ≦ d ≦ φ / 2
φ / 10 ≦ e ≦ φ / 2
It is characterized by having a shape that satisfies the above relationship.

  In order to achieve the above object, according to the invention described in claim 3 of the present application, in the illumination device according to claim 1 or 2, the first reflecting surface has an inclination with respect to the emission optical axis of 2 ° or less. It is characterized by comprising a plane.

According to a third aspect of the present invention for achieving the above object, in the illumination device according to the first to third aspects, a light beam emitted from the light source means in the vicinity of an emission optical axis is the first incident light. Of the luminous flux incident on the surface, if the maximum value of the angle formed with the exit optical axis is θbdr,
25 ° ≦ θbdr ≦ 45 °
It is characterized by having a shape that satisfies the above relationship.

  In order to achieve the object, according to the invention described in claim 5 of the present application, in the illumination device according to claims 1 to 4, the reflecting member is formed in a semi-cylindrical shape around the center of the light source means. It is characterized by.

  In order to achieve the above object, according to the invention described in claim 6 of the present application, in the illuminating device according to claim 5, the reflecting member emits light in at least one section of the emitted light flux from the center of the light source. A portion that reflects so as to be substantially parallel to the axis is formed.

  In order to achieve the object, according to the invention described in claim 7 of the present application, in the illumination device according to claims 1 to 4, the reflecting member is formed in a hemispherical shape around the center of the light source means. It is characterized by being.

  In order to achieve the above object, according to the invention described in claim 8 of the present application, in the illumination device according to claims 1 to 4, the lighting device includes an electric substrate for controlling light emission of the light source means, A hole for inserting a part of the reflecting member is provided.

  In order to achieve the object, according to the invention described in claim 9 of the present application, in the illumination device according to claims 1 to 9, the light source means is a light emitting lamp.

  In order to achieve the object, according to the invention described in claim 10 of the present application, the photographing apparatus according to claim 10 includes the illumination device according to any one of claims 1 to 9.

  As described above, according to the present invention, by optimally designing each surface of the optical member and the reflecting mirror of the lighting device, the camera efficiently irradiates light while shortening the depth direction of the lighting device necessary for photographing. It becomes possible to do. Therefore, it is possible to reduce the size of the camera using the illumination device.

  Further, since the light emitting lamp and the reflecting mirror are fixed on the same electric substrate, it becomes possible to unitize with high accuracy.

  As described above, according to the present invention, the optical member of the lighting device and each surface of the reflecting mirror are optimally designed, so that the camera efficiently emits light while shortening the depth direction of the lighting device necessary for photographing. Irradiation became possible. Therefore, it is possible to reduce the size of the camera using the illumination device.

  In addition, since the light emitting lamp and the reflecting mirror are fixed on the same electric substrate, it is possible to make a unit with high accuracy.

  The lighting device according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic view of a main part of an embodiment when the illumination device of the present invention is provided on the upper side of a camera (imaging device).

  FIG. 2 is a perspective view of the illumination device of the present embodiment as viewed from the front. Moreover, FIG. 3 is the perspective view which looked at the illuminating device of this embodiment from back.

  In FIG. 1, reference numeral 1 denotes a camera body, and 2 denotes a lens barrel, which holds a photographing lens (not shown). Reference numeral 3 denotes a finder. Reference numeral 4 denotes an illuminating device used for irradiation of auxiliary light for autofocus (AF). The illuminating device 4 includes a light emitting lamp 5 having a dome-shaped tip that emits light as light source means, and a light beam emitted from the light emitting lamp 5 other than the front, for example, rearward (opposite to the subject side). The reflecting mirror 6 using internal reflection to collect and reflect the light toward the object side, the light beam directly incident from the light-emitting lamp 4 and the light beam reflected and incident by the reflecting mirror 6 are condensed as a light beam of a predetermined shape, It has an optical member (optical prism) 7 for guiding an illumination light beam that irradiates efficiently to the side.

  The reflecting mirror 6 is formed of a metallic material such as bright aluminum whose inner surface has a high reflectance. Moreover, the optical member 7 is comprised with the optical material with high transmittance | permeability, such as optical glass and an acrylic resin.

  The light emitting lamp 5 is disposed perpendicular to the optical axis. The optical member 7 has a rotationally symmetric shape around the optical axis, and a notch for the light-emitting lamp 5 exists on the incident surface side. The exit surface side of the optical member 7 is a flat surface.

  FIG. 4 is an xz sectional view of the optical system of the illumination device 4. FIG. 5 is a yz sectional view of the optical system of the illumination device 4. 4 and 5, the filament in the light emitting lamp 5 and the terminal portion extending from the light emitting lamp 5 are omitted. Each figure is shown with a ray trace added.

  First, in FIG. 4, the inner and outer diameters of the light-emitting lamp 5 are shown. The filament (not shown) of the light-emitting lamp 5 has a certain size, but in the design stage, in order to efficiently control the light emitted from the light-emitting lamp (light source) 5, it is ideally located at the light source center O. If it is assumed that there is a point light source, the shape of the optical system is designed, and then the correction considering the light source having a finite size is performed, it is possible to design efficiently.

  Based on this idea, the present invention also considers the center of the light emitting part of the light emitting lamp 5 as a reference value for determining the shape, and sets the shape of each part of the optical member 7 and the reflecting mirror 6 as follows.

  First, as the material of the optical member 7, it is optimal to use an optical resin material such as an acrylic resin in terms of moldability and cost. However, in this type of lighting device, a large amount of heat is generated simultaneously with the generation of light from the light source. In consideration of the influence of this heat, it is necessary to select an optical material and set a heat dissipation space.

  At this time, it is the first incident surface 7a and the second incident surfaces 7b and 7b 'of the optical member 7 closest to the light source that are actually most susceptible to heat. First of all, it is necessary to determine the minimum distance. In the present embodiment, d is the minimum distance between the incident surface 7a and the light source where the exit angle from the light source center O is close to the exit optical axis AXL by direct refraction, and the angle component away from the exit optical axis AXL is all. The distance between the second incident surface 7b on which light controlled by reflection is incident and the light source is defined as e, and the interval is regulated.

Here, if the distance between each incident surface and the light source is too large, the entire optical system becomes large. Therefore, if the diameter of the dome of the light-emitting lamp 5 is φ, the minimum distances are d and e,
φ / 10 ≦ d ≦ φ / 2
φ / 10 ≦ e ≦ φ / 2 (1)
It is desirable to be in the range.

  Next, a method of determining the incident surface shape of the first incident surface 7a will be described. Of the emitted light beam from the light source center O, all components directly incident on the incident surface 7a are converted to be parallel to the emitted optical axis when viewed in the cross section shown in the figure. That is, the incident surface 7a is formed of an aspheric lens surface having a focal length of a length from the light source center O to the incident surface 7a in consideration of the glass thickness of the light-emitting lamp 5 and correcting spherical aberration.

  Next, the shapes of the second incident surfaces 7b and 7b 'for guiding incident light to the total reflection surfaces 7c and 7c' of the optical member 7 are determined. In order to minimize the shape of the optical member 7 as the shape of the second incident surfaces 7b and 7b ', a plane parallel to the optical axis is desirable. That is, the component of the luminous flux emitted from the light-emitting lamp 5 that travels in a direction different from the emission optical axis is refracted once at this incident surface, but the smaller the angle of this surface, the greater the refraction effect. This is because the light can be once guided in the direction away from the optical axis, and the entire length of the optical member 2 can be kept short.

  The inclination of the second incident surfaces 2 b and 2 b ′ is determined by the molding conditions of the optical member 2. The smaller the angle is, the more severe the actual molding conditions are. However, the ideal shape of the maximum angle φ with respect to the optical axis of the surfaces 7b and 7b ′ is that the incident surfaces 7b and 7b ′ are flat or curved. Regardless, it should be in the following range.

0 ≦ φ <2 ° (2)
The above range is a setting value that seems to be difficult at first glance, but is a sufficiently possible numerical value because the distance between the second incident surfaces 7b and 7b 'is short and the surface shape is a smooth surface.

  Further, the shape of the total reflection surfaces 7c and 7c ′ is such that the components incident on the incident surfaces 7b and 7b ′ out of the emitted light beam from the light source center O are reflected on the total reflection surface and viewed from the cross section shown in the figure. It is converted to be parallel to.

  In this way, all light beams emitted forward from the light source center O of the light-emitting lamp 5 are converted into parallel light.

  On the other hand, of the light emitted from the light-emitting lamp 5, the light beam directed toward the rear of the light-emitting optical axis is emitted again after being reflected by the reflecting mirror 6 because the shape of the reflecting mirror 6 is concentric with the light-emitting lamp 5. The light enters the lamp 5 and passes through the light source center O of the light-emitting lamp 5 and is guided in front of the emission optical axis. The state of light rays after returning to the center of the light source is the same as described above.

  As described above, the light beam emitted from the light source center O is all refracted by the incident surface 7a of the optical member 7 or refracted by the incident surfaces 7b and 7b ′ and reflected by the total reflection surfaces 7c and 7c ′. The cross section shown in the figure is converted into a component parallel to the exit optical axis and guided to the exit surface 7d.

  Then, when the inner diameter of the light-emitting lamp 5 is sufficiently small, or when the optical member 7 can be regarded as sufficiently large with respect to the light-emitting lamp 5, the light collection control can be performed fairly efficiently by the above method. However, in terms of actual light distribution characteristics, the size of the inner diameter, which is an effective light emitting portion of the light source, is not so small as to be negligible. Due to this influence, all the light beams that have passed through the optical member 2 are components that are parallel to the emission optical axis. It is not converted to, but is converted into a distribution having a certain range in the vertical direction.

  In particular, the control surface near the light source, for example, the incident surface 7a that directly controls the light beam emitted from the light source, and the reflected light beam at the rear end of the prism near the light source even on the total reflection surfaces 7c and 7c ′ have this effect. In practice, the light distribution is broadened to some extent by the components controlled in this range.

  Next, the position of the boundary surface of the incident surface 7a will be described. As described above, in consideration of the influence of heat on the resin material of the incident surface 7a, the conditions for efficiently forming the minimum optical system include the first incident surface 7a and the second incident surface. It is desirable that the angle θbdr of the straight line connecting the coordinates of the intersection of 7b and 7b ′ and the light source center O is within a certain range.

  That is, if this angle is smaller than the predetermined angle, the distance to the first incident surface 7a is increased, and the condensing efficiency due to refraction increases because it is less affected by the size of the light source, but the second incident surfaces 7b, 7b. The incident angle to 'increases and loss due to surface reflection at the incident surface is likely to occur.

  On the other hand, if this angle is larger than the predetermined angle, the incident light flux from the first incident surface 7a that needs to be controlled on the surface close to the light source increases, and it is difficult to obtain a sufficient light collecting effect depending on the size of the light source.

That is, the boundary line between the incident surface 7a that controls light directed toward the front of the optical member 7 only by refraction and the incident surfaces 7b and 7b ′ that guide light emitted mainly obliquely forward from the light source to the total reflection surface; Assuming that the slope θbdr of the line connecting the light source center O is
25 ° ≦ θbdr ≦ 45 ° (3)
It is desirable from the viewpoint of efficiency and light collection control to be in this range.

  Next, as can be seen from FIG. 5, the optical member 7 has a rotationally symmetric shape about the optical axis AXL. Here, the optical member 7 is cut out in a cylindrical shape so that the light-emitting lamp 5 is arranged perpendicular to the optical axis.

  By defining the shape of the optical member 7 by the method as described above, it is possible to form a condensing optical system that is the smallest and most efficient in consideration of the heat generation conditions of a given light source.

  Next, a lighting device according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is an xz sectional view of the optical system of the illumination device 4. FIG. 7 is a yz sectional view of the optical system of the illumination device 4. 6 and 7, the filaments in the light emitting lamp and the terminal portions coming out of the light emitting lamp are omitted. Each figure is shown with a ray trace added.

  In FIG. 6, 8 is a light emitting lamp, 9 is a reflecting mirror, and 10 is an optical member (optical prism).

  First, all the components directly incident on the incident surface 10a of the emitted light beam from the light source center O are converted so as to be parallel to the emitted optical axis when viewed in the illustrated cross section. That is, the incident surface 10a is formed of an aspheric lens surface having a focal length of a length from the light source center O to the incident surface 10a in consideration of the glass thickness of the light-emitting lamp 8 and correcting spherical aberration.

  Next, in order to minimize the shape of the optical member 7 as the shape of the second incident surfaces 10b and 10b ′ for guiding incident light to the total reflection surfaces 10c and 10c ′ of the optical member 10, it is parallel to the optical axis. A flat surface is desirable. That is, the component of the luminous flux emitted from the light-emitting lamp 8 that travels in a direction different from the emission optical axis is refracted once at this incident surface. However, the smaller the angle of this surface, the greater the refraction effect. This is because the light can be once guided in the direction away from the optical axis, and the entire length of the optical member 2 can be kept short.

  Further, the shapes of the total reflection surfaces 10c and 10c ′ are such that the components incident on the incidence surfaces 10b and 10b ′ out of the emitted light beam from the light source center O are reflected from the total reflection surface and viewed from the cross section shown in the figure. It is converted to be parallel to.

  In this way, all light beams emitted forward from the light source center O of the light-emitting lamp 8 are converted into parallel light.

  Next, as shown in FIG. 7, the reflecting mirror 9 is provided with a reflecting portion 9 a that covers the dome side of the light-emitting lamp 8. The reflecting portion 9a has a shape that makes a large angle component with respect to the optical axis parallel to the optical axis in the light beam irradiated forward from the light source.

  Therefore, the light beam reflected by the reflecting portion 9a enters from the incident surfaces 10d and 10d 'of the optical member 10, and is irradiated as the light beam parallel to the optical axis.

  As shown in FIG. 7, the reflecting mirror 9 is provided with a concentric reflecting portion 9 b in the dome portion of the light-emitting lamp 8. Therefore, the light beam emitted from the dome portion of the light-emitting lamp 8 out of the light beam irradiated rearward from the light source is guided by the light source center O to the front of the emission optical axis after being reflected by the reflecting portion 9b. The state of light rays after returning to the center of the light source is the same as described above.

  From the above, the illumination device according to the second embodiment of the present invention can form a more efficient condensing optical system.

  Next, a lighting device according to a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is an xz sectional view of the optical system of the illumination device 4. FIG. 9 is a yz sectional view of the optical system of the illumination device 4. 8 and 9, the filaments in the light emitting lamp and the terminal portions coming out of the light emitting lamp are omitted. Each figure is shown with a ray trace added.

  In FIG. 8, 11 is a light emitting lamp, 12 is a reflecting mirror, and 13 is an optical member (optical prism).

  First, all the components directly incident on the incident surface 13a of the emitted light beam from the light source center O are converted so as to be parallel to the emitted optical axis when viewed in the illustrated cross section. That is, the incident surface 13a has an aspherical lens surface having a focal length of a length from the light source center O to the incident surface 13a in consideration of the glass thickness of the light-emitting lamp 11, and corrected for spherical aberration.

  Next, in order to minimize the shape of the optical member 13 as the shape of the second incident surfaces 13b and 13b ′ for guiding incident light to the total reflection surfaces 13c and 13c ′ of the optical member 13, it is parallel to the optical axis. A flat surface is desirable. That is, the component of the luminous flux emitted from the light-emitting lamp 11 that travels in a direction different from the emission optical axis is refracted once at this incident surface, but the smaller the angle of this surface, the greater the refraction effect. This is because the light can be once guided in the direction away from the optical axis, and the entire length of the optical member 2 can be kept short.

  Further, the shapes of the total reflection surfaces 13c and 13c ′ are such that the components incident on the incident surfaces 13b and 13b ′ out of the emitted light beam from the light source center O are reflected on the total reflection surface and viewed from the cross section shown in the figure. It is converted to be parallel to.

  In this way, all light beams emitted forward from the light source center O of the light-emitting lamp 11 are converted into parallel light.

  Next, as shown in FIG. 9, the reflecting mirror 12 is provided with a concentric spherical reflecting portion 12 a at the center of the light source of the light emitting lamp 11. Therefore, the light beam irradiated forward from the light source is reflected by the reflecting portion 12a and then substantially guided through the light source center O to the front of the emission optical axis. The state of light rays after returning to the center of the light source is the same as described above.

  From the above, the illumination device according to the third embodiment of the present invention can form a more efficient condensing optical system.

  Next, the illuminating device of the 4th Embodiment of this invention is demonstrated using FIG. 10 and 11 are exploded perspective views of the illumination device according to the fourth embodiment of the present invention as seen from the rear. The reflecting mirror of FIG. 10 is that of the first embodiment. The reflecting mirror of FIG. 11 is that of the third embodiment. 10 and 11 are different only in the reflecting mirror.

  In FIG. 10, reference numeral 14 denotes an electric board for controlling the light emission state of the light emitting lamp, and electric components such as resistors and capacitors are omitted. The optical system is the same as that of the illumination apparatus according to the first embodiment of the present invention, 5 is a light emitting lamp, 6 is a reflecting mirror, and 7 is an optical member (optical prism).

  Here, the electric substrate 14 has a hole portion 14a into which the terminal portion of the light emitting lamp 5 is inserted, and is electrically coupled by solder or the like. The electric board 14 has an arch-shaped opening i into which the reflecting mirror 6 is inserted, and the reflecting mirror 6 is press-fitted into the opening.

  11 has the same configuration as FIG. 10, 15 is an electric substrate for controlling the light emission state of the light emitting lamp, 11 is a light emitting lamp, 12 is a reflecting mirror, and 13 is an optical member (optical prism). The electric board 15 has an arch-shaped opening 15a into which the reflecting mirror 12 is inserted, and the reflecting mirror 12 is press-fitted into the opening.

  Each of the light emitting lamps is fixed to the electric substrate with solder or the like after adjusting the position of the filament.

  Therefore, according to the present embodiment, the light emitting lamp and the reflecting mirror are fixed on the same electric substrate, so that the positional relationship can be made with high accuracy. Therefore, an efficient condensing optical system as described in the description of the embodiment of the present invention can be unitized with high accuracy.

  Here, assuming that the light source is a point light source, it is desirable to match the shape described above. However, since the light source actually has a finite size corresponding to the filament of the light-emitting lamp, the shape is strictly regulated so far. Even if not, almost the same light distribution characteristics can be obtained.

  For example, even if a single or a plurality of planes or cylindrical surfaces approximating the above shape, or a quadratic surface such as an ellipse is used, there is a shape that can obtain substantially the same effect as the light distribution characteristics obtained by the above shape. .

  For this reason, the shapes of the incident surface, the reflecting surface, and the reflecting mirror of the optical member in the present invention are not limited to the above shapes, but are shapes that approximately satisfy the shapes of each surface of the optical member and the reflecting mirror. It shall be prescribed including.

  Further, by forming the optical member and the reflecting mirror with such an approximate shape, it is very easy to measure whether the actually processed product is as designed, compared to the case where the surface shape is an aspherical surface. There is an advantage that.

  The illumination optical system collimates all the light beams emitted from the light source center O to the optical axis. However, when the illumination optical system is used for illumination for reducing red-eye of a camera, etc. Alternatively, the light beam may be converted into a light beam having a certain angle.

1 is a schematic view of a main part of a camera equipped with the present invention. The perspective view seen from the front of the illuminating device of the 1st Embodiment of this invention. The perspective view seen from the back of the illuminating device of the 1st Embodiment of this invention. The xz sectional view of the illuminating device of the 1st Embodiment of this invention. Yz sectional drawing of the illuminating device of the 1st Embodiment of this invention. The xz sectional view of the illuminating device of the 2nd Embodiment of this invention. Yz sectional drawing of the illuminating device of the 2nd Embodiment of this invention. The xz sectional view of the illuminating device of the 3rd Embodiment of this invention. Yz sectional drawing of the illuminating device of the 3rd Embodiment of this invention. The disassembled perspective view seen from the back of the illuminating device of the 4th Embodiment of this invention. The disassembled perspective view seen from the back of the illuminating device of the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera body 2 Lens barrel part 3 Finder 4 Illuminating device 5 Light source means 6 Reflective mirror 7 Optical member 8 Light source means 9 Reflective mirror 10 Optical member 11 Light source means 12 Reflective mirror 13 Optical member 14 Electrical board 15 Electrical board

Claims (10)

A light source means, and an optical member and a reflecting member for irradiating the light flux from the light source means toward the subject,
The light source means has a dome-shaped tip and a terminal portion located on the opposite side of the dome,
In the lighting device arranged perpendicular to the irradiation optical axis,
In at least one section passing through the light source center of the light source means, out of the emitted light beam from the optical axis center, after being refracted by the first incident surface or after being refracted by the second incident surface and totally reflected by the total reflection surface An illuminating device characterized in that at least one of the above is regulated to be substantially parallel to the optical axis. When the diameter of the light source means is φ, the minimum distance from the first incident surface is d, and the minimum distance from the second incident surface is e,
φ / 10 ≦ d ≦ φ / 2
φ / 10 ≦ e ≦ φ / 2
The lighting device according to claim 1, wherein the lighting device is configured in a shape that satisfies the above relationship.   3. The lighting device according to claim 1, wherein the first reflecting surface is configured by a plane having an inclination with respect to an emission optical axis of 2 ° or less. Of the luminous fluxes that are emitted from the light source means in the vicinity of the emission optical axis and incident on the first incident surface, the maximum value of the angle formed with the emission optical axis is θbdr,
25 ° ≦ θbdr ≦ 45 °
The lighting device according to claim 1, wherein the lighting device is formed in a shape that satisfies the above relationship.   5. The illumination device according to claim 1, wherein the reflecting member is formed in a semi-cylindrical shape with the center of the light source means as an axis.   6. The illuminating device according to claim 5, wherein the reflecting member is formed with a portion that reflects so as to be substantially parallel to the optical axis in at least one cross section of the emitted light beam from the center of the light source.   5. The illumination device according to claim 1, wherein the reflecting member is formed in a hemispherical shape with the center of the light source means as an axis. An electric board for controlling light emission of the light source means;
The lighting device according to claim 1, wherein the electric board is provided with a hole for inserting a part of the reflecting member.   9. The photographing apparatus according to claim 1, wherein the light source means is a light emitting lamp.   An imaging device comprising the illumination device according to claim 1.

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