JP6176930B2 - Lighting device for photography - Google Patents

Description

  The present invention relates to an illuminating device used with a photographing apparatus such as a digital still camera, and more particularly to an illuminating apparatus supported so as to surround the outer periphery of a photographing lens.

  In macro photography for photographing a subject at a close distance, an illuminating device having a ring-shaped or arc-shaped light emitting portion along the outer periphery of the photographing lens is often used. Patent Document 1 discloses an illumination device in which a light source such as a xenon tube is formed in an arc shape, and a plurality of the light sources are arranged along the outer periphery of the photographing lens to constitute a ring-shaped light emitting portion. .

JP 2001-215574 A

  However, in the illuminating device disclosed in Patent Document 1, as a light source, a glass tube of a light source that is generally manufactured as a straight tube type, such as a xenon tube, is bent into a circular arc shape by bending with high accuracy. The formed one (curved pipe type) is used. As a result, there is a problem that the cost of the light source increases and the lighting device becomes expensive. In addition, it is difficult to efficiently and uniformly irradiate the light emitted from the plurality of curved tube light sources toward the subject that is the subject of the macro photography, and the light use efficiency and the light distribution distribution are difficult. There is also a problem that sufficient performance cannot be obtained.

  Further, since this type of illumination device is carried and used with a camera (and an interchangeable photographing lens), it is desired to be as small as possible. However, since large electrical components such as a trigger coil for starting light emission (discharge) of the light source and a light receiving sensor for monitoring the light emission amount of the light source are arranged inside the illumination device, Miniaturization is difficult.

The present invention, without using a bend type light source, the light from the light source efficiently by utilizing can perform bright irradiation suitable for macro photography or the like, sufficiently compact while having a large electrical parts Provided a lighting device.

An illuminating device according to one aspect of the present invention can be disposed so as to surround the outer periphery of the photographing lens, and corresponds to the radial direction of the photographing lens in a state where the illuminating device is supported so as to surround the outer periphery of the photographing lens. The direction to be the radial direction of the illuminating device, the direction surrounding the outer periphery of the photographic lens is the circumferential direction of the illuminating device, the direction toward the object field photographed through the photographic lens is the light irradiation direction of the illuminating device, The direction along the optical axis of the photographing lens is the thickness direction of the illumination device. At this time, the illuminating device is provided so as to extend in the circumferential direction on the inner side in the radial direction of the light source, the first reflection unit that reflects the light from the light source in the light irradiation direction, and the light from the light source And a reflecting member provided with a second reflecting portion that reflects toward a region extending in a direction away from the light source in the circumferential direction of the first reflecting portion . The first reflecting portion includes a first region and a second region disposed on both sides of the first region in the circumferential direction, and the second reflecting portion is a second region disposed on one of both sides. A first surface that reflects a part of the light from the light source and a second surface that reflects a part of the light from the light source to a second region disposed on the other side of both sides. The first reflecting portion of the reflecting member and the back surface of the first reflecting portion are formed so as to be positioned closer to the light irradiation direction in the thickness direction as the distance from the light source in the circumferential direction increases. A connector to which a trigger coil for causing the light source to start light emission, a light receiving sensor for detecting the light emission amount of the light source, and a cable connected to the illumination device are connected to the space facing the back side of the reflecting member in the thickness direction. Among them, at least one is arranged.

According to the present invention, it is possible to provide an illumination device which can be carried out, the light irradiation suitable for macro photography or the like light efficiently utilized from the light source without using a bent-tube type light source.

  Furthermore, according to the present invention, large electrical components such as a trigger coil, a light receiving sensor, and a connector can be efficiently arranged in the space on the back surface side of the reflecting member, so that the lighting device can be sufficiently downsized. it can.

The perspective view which shows the illuminating device which is the reference example 1 of this invention, and the imaging device with which this illuminating device was mounted | worn. The exploded perspective view of the illuminating device of the reference example 1. FIG. The front view of the illuminating device of the reference example 1. FIG. Sectional drawing of the illuminating device of the reference example 1, and the one part enlarged view. The figure which shows the optical path of the light ray in the illuminating device of the reference example 1. FIG. The front view of the optical system of the illuminating device of the reference example 1, and the perspective view of the reflective umbrella used for this optical system, and a circular arc reflection member. The back view and sectional drawing of the prism panel used for the illuminating device of the reference example 1. FIG. The back view and sectional drawing of the diffusion panel used for the illuminating device of the reference example 1. FIG. The ray trace figure of the illuminating device of the reference example 1. FIG. The figure which shows the position of the cut surface of the illuminating device of the reference example 1. FIG. Sectional drawing corresponding to each cut surface shown in FIG. The figure which shows the light ray in the light emission part of the illuminating device of the reference example 1. FIG. The front view of the illuminating device which is the reference example 2 of this invention. Sectional drawing of the illuminating device of the reference example 2, and the one part enlarged view. The comparison figure of the reference example 1 and the reference example 2 (a front view and sectional drawing of a circular arc reflection member). The comparison figure of the reference example 1 and the reference example 2 (the perspective view which expanded a part of FIG. 15). The comparison figure of the reference example 1 and the reference example 2 (sectional drawing of an illuminating device). Sectional drawing which shows the internal structure of the illuminating device of the reference example 2. FIG. The ray trace figure of the illuminating device of the reference example 2. FIG. 1 is a perspective view showing an illumination apparatus that is Embodiment 1 of the present invention and a photographing apparatus equipped with the illumination apparatus. FIG. FIG. 3 is an exploded perspective view of the lighting device according to the first embodiment. FIG. 3 is a front view illustrating an internal configuration of the lighting apparatus according to the first embodiment. FIG. 3 is a partial enlarged cross-sectional view of the lighting device of the first embodiment. FIG. 3 is a perspective view of an arc reflecting member used in the lighting device according to the first embodiment. FIG. 3 is a cross-sectional view of the lighting apparatus according to the first embodiment. FIG. 4 is another cross-sectional view of the lighting device according to the first embodiment. FIG. 3 is a partial cross-sectional perspective view of the lighting apparatus according to the first embodiment. The figure which shows the emission range (light quantity distribution) of the emitted light from the reflector in the reference example 2 and Example 1. FIG. FIG. 3 is a front view illustrating a locking mechanism of the lighting apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a prism panel used in the illumination device according to the first embodiment. The figure which shows the prism diffusion panel used for the illuminating device which is Example 2 of this invention. The front view, top view, and bottom view which show the internal structure of the illuminating device which is Example 3 of this invention. FIG. 11 is a front view showing an internal configuration of a lighting device as a modification of Example 3. FIG. 34 is a cross-sectional view of the lighting device shown in FIG. 33. FIG. 10 is a partial cross-sectional view of a lighting device as another modification of the third embodiment. The perspective view of the illuminating device as another modification of Example 3. FIG. The front view, top view, and sectional drawing of the illuminating device as another modification of Example 3. FIG.

Embodiments of the present invention will be described below with reference to the drawings. First, prior to the description of the lighting device according to the embodiment of the present invention, a technique that is a premise of the lighting device according to the embodiment will be described as a reference example.
(Reference Example 1)
FIG. 1 shows an illuminating device 101 for macro photography that is Reference Example 1 of the present invention, and a photographic device (camera) in which the illuminating device 101 is attached (supported) to the distal end portion of a photographic lens 201 so as to surround the outer periphery thereof. 200. The illumination device 101 is detachably attached to the photographing lens 201. The photographing lens 201 may be provided integrally with the camera, or may be an interchangeable lens that is detachably attached to the camera. Further, the illumination device 101 may be configured to be detachably attached to the imaging device 200 instead of the imaging lens 201 as long as the illumination device 101 can be supported so as to surround the outer periphery of the imaging lens 201.

  The illuminating device 101 includes a microcomputer for controlling the light emission of the illuminating device 101, a main capacitor for storing a power source and luminescence energy, and the like, and is attached to a camera 200 accessory shoe (not shown) in a removable manner. It has. The lighting device 101 and the control unit 100 are connected by a connecting cord 102.

  As will be described in detail later, the illumination device 101 includes two light sources that emit light source light serving as illumination light for macro photography, and illumination optics that irradiates light from these two light sources toward a subject field (subject). The system is mounted. Further, the illumination device 101 may be equipped with an auxiliary light emitting unit that emits auxiliary light to a dark subject when the camera 200 performs autofocus.

  As shown in FIG. 1, the illumination device 101 may be mounted on the photographing lens 201 so that two light sources (built in a portion protruding in the radial direction from the ring-shaped portion) are arranged symmetrically. However, it may be mounted at a position rotated from this position in the circumferential direction of the photographic lens 201. In addition, it is possible to intentionally create a shadow or select a direction in which the shadow appears by emitting only one of the two light sources arbitrarily selected by the user.

  The light emission control of the illumination device 101 can be performed as follows, for example. First, immediately before the main shooting, a pre-flash that irradiates the subject with a constant amount of light for a predetermined time is performed, and the luminance distribution of the subject is measured by a photometric sensor mounted in the camera 200. Then, using the measured luminance distribution, a light emission amount in main light emission performed at the time of main photographing is determined in advance from a predetermined algorithm. Combining this light emission control with so-called multi-division metering enables more precise light control according to the subject's condition, and in particular, light control suitable for macro photography that is susceptible to light emission error. It can be carried out.

  Next, the configuration of the lighting device will be described in detail. In the following description, as shown in FIG. 1, the illumination device 101 is attached to the photographing lens 201 and is supported so as to surround the outer periphery of the photographing lens 201. The direction to go is set as the light irradiation direction L or the front of the lighting device 101. The light irradiation direction L includes not only a direction parallel to the optical axis (hereinafter referred to as a lens optical axis) AX of the photographing lens 201 but also a direction having a certain angle with respect to the lens optical axis AX. Also, the direction corresponding to the radial direction of the photographing lens 201 (the direction orthogonal to the lens optical axis AX) is the radial direction R of the illumination device 101, and the direction surrounding the outer periphery of the photographing lens 201 is the circumferential direction CC of the illumination device 101. . Furthermore, the direction in which the tangent of the outer periphery (circle) of the photographic lens 201 extends is referred to as a tangential direction T with respect to the circumferential direction CC. The direction along the optical axis AX of the photographing lens 201 is referred to as the thickness direction of the illumination device 101.

  FIGS. 2A and 2B show the disassembled illumination device 101 as viewed obliquely from the front. FIG. 3 shows the illumination device 101 as viewed from the front side (front side). 4A shows a cross section of the lighting device 101 when cut along line AA in FIG. 3, and FIG. 4B shows a circle in FIG. 4A. The part is shown enlarged. 5A shows the optical paths of light beams L1, L2, and L3 emitted from the light source 1, which will be described later, and FIG. 5B enlarges a part of FIG. 5A. As shown. In FIG. 6A, the reflector 2, the arc reflecting member 3, the prism panel 4 (not shown in FIG. 6A) and the diffusion panel 5 constituting the illumination optical system are shown from the front side. Show and show. In the left half of FIG. 6A, the prism panel 4 and the diffusion panel 5 are removed. In FIG.6 (b), the circular-arc reflection member 3 is expanded and it sees from diagonally forward.

  FIG. 7A shows the prism panel 4 as viewed from the back surface (incident surface) side. FIG.7 (b) has shown the cross section along the GG line in Fig.7 (a). FIG. 8A shows the diffusion panel 5 as viewed from the back surface (incident surface) side. FIG. 8B shows a cross section along the line KK in FIG. Further, FIG. 9 shows a light beam emitted from the light source 1 as viewed from the front side.

  The illumination device 101 includes a central axis (axis that coincides with the lens optical axis AX in use) BX, and has a symmetric configuration with respect to a central plane on which two light sources are arranged on both sides. For this reason, below, it demonstrates focusing on the structure of one (left side) in the symmetrical structure, and demonstrates the structure of the other (right side) as needed.

  As the light source 1, in this reference example, a straight tube type light source such as a discharge arc tube such as a xenon tube or a cold cathode tube is used. The light source 1 is arranged such that its longitudinal direction coincides with the tangential direction T. In this reference example, the light sources 1 are arranged on the left side and the right side, respectively, and their longitudinal directions coincide with the tangential direction T and are parallel to each other. As the light source 1, instead of the straight tube light source, a linear light source configured by arranging a plurality of LEDs in a straight line may be used, or a single light source that is not a curved tube type may be used. The lighting device 101 contains electrical components such as a trigger coil for starting light emission of the light source 1 and a light receiving sensor for monitoring the light emission amount from the light source 1.

  The reflector (condensing member) 2 has a reflecting surface 2 a that reflects light that travels in directions other than the direction of the arc reflecting member 3 and the prism panel 4 described later, out of the light diverged from the entire outer periphery of the light source 1. The reflecting surfaces 2a are provided on both sides of the light source 1 in the thickness direction and on both sides in the longitudinal direction of the light source 1, and reflect the light reflected here so as to be directed toward the arc reflecting member 3 or the prism panel 4. The light is emitted from a light exit opening formed between the tip portions of the reflecting surfaces 2a. In addition, the reflector 2 emits the light emitted from the light source 1 toward the arc reflecting member 3 and the prism panel 4 from the light exit opening without reflecting.

  The reflector 2 is formed integrally with the reflecting surface 2a with a highly reflective material such as bright aluminum so that light can be efficiently reflected, or a highly reflective metal material is deposited inside the resin body. The reflective surface 2a is formed. The reflection surface 2 a of the reflector 2 is formed in an elliptical shape having two focal points in a cross section orthogonal to the longitudinal direction (tangential direction T) of the light source 1.

  Here, the elliptical shape of the cross section of the reflector 2 (reflecting surface 2a) has one focal point located at the radial center of the light source 1 (on the light source side), and the other focal point of the arc reflecting member 3 described later. It is desirable to set so as to be positioned on one reflection surface (the first reflection surface side). With this setting, as shown in FIG. 5A, the light reflected by the reflector 2 is collected and can reach the light farther. In addition, by optimizing the elliptical shape as appropriate, the directivity of the light reflected by the reflector 2 can be adjusted, and the reflected light can reach far enough even if the reflector 2 is small. It becomes possible to emit light from a wide area (light emitting part) in the circumferential direction CC and the radial direction R.

  The cross-sectional shape of the reflecting surface 2a of the reflector 2 may be a quadratic curve other than an ellipse.

  The arc reflecting member 3 is manufactured by vapor-depositing a highly reflective metal material on a resin main body formed in a semicircular arc shape so as to have two ring shapes. One arc reflection member 3 is provided for each of the two light sources 1 (two in total), and each of the arc reflection members 3 has a reflection surface described below.

  As shown in FIGS. 6A and 6B, the arc reflecting member 3 is a reflecting surface formed to extend in the circumferential direction CC on the inner side in the radial direction R than the light source 1. The first reflecting surfaces 3c and 3d that reflect light (including light reflected by the reflector 2) in the light irradiation direction L are provided. The first reflecting surface has a light source side reflecting surface (first region) 3 c that is a portion facing the central portion in the longitudinal direction of the light source 1. Further, the first reflecting surface has two arc reflecting surfaces (second arcs) extending in an arc shape from the light source side reflecting surface 3c toward both sides in the circumferential direction CC, that is, away from the light source 1 in the circumferential direction CC. Area) 3d. In the following description, a space formed between the light source side and the arc reflecting surfaces 3c and 3d and the prism panel 4 arranged in the light emission direction L from them is referred to as an optical path region.

  The arc reflecting member 3 has two second reflecting surfaces 3a in addition to the light source side and the arc reflecting surfaces 3c and 3d. As shown in FIG. 9, the second reflecting surface 3a is a direction in which a part of the light traveling from the light source 1 toward the light source side reflecting surface 3c is separated from the light source 1 in the circumferential direction CC along the arc reflecting surface 3d. Reflected toward the optical path region extending to When the second reflecting surface 3a is not provided, the light emitted from the light source 1 is directed more toward the light source side reflecting surface 3c than the arc reflecting surface 3d. If this large amount of light is reflected by the light source side reflecting surface 3c in the light emission direction L, a large light amount difference between a portion close to the light source 1 and a portion away from the portion in the circumferential direction CC in the light emission portion described later. Occurs.

  For this reason, in the present reference example, the two second reflecting surfaces 3a are arranged between the light source side reflecting surface 3c and the two arc reflecting surfaces 3d like a partition wall that partitions them. In other words, the two second reflecting surfaces 3a are arranged so as to be symmetrical with respect to a central cross section that is separated from each other in the longitudinal direction of the light source 1 and passes through the center of the light source 1 in the longitudinal direction and orthogonal to the longitudinal direction. ing. The two second reflecting surfaces 3a are arranged so that the distance in the circumferential direction CC between the two second reflecting surfaces 3a becomes narrower as it approaches the light source 1 in the radial direction R.

  Of the light traveling from the light source 1 toward the light source side reflecting surface 3c, the light reflected by one surface of the two second reflecting surfaces 3a travels to the optical path region along the one arc reflecting surface 3d. In addition, of the light traveling from the light source 1 toward the light source side reflecting surface 3c, the light reflected by the other surface of the two second reflecting surfaces 3a travels to the optical path region along the other arc reflecting surface 3d. And the light which was not reflected by the two 2nd reflective surfaces 3a among the light which went to the light source side reflective surface 3c from the light source 1 arrives at the light source side reflective surface 3c. The positions and shapes of the two second reflecting surfaces 3a arranged between the light source side reflecting surface 3c and the two arc reflecting surfaces 3d are uniform in the amount of light emitted from the arc-shaped (ring-shaped) light emitting portion. It is decided to become. That is, by providing the second reflection surface 3b having an appropriate shape at an appropriate position, the light directed from the light source 1 toward the light source side reflection surface 3c is transmitted to the entire first reflection surfaces 3c and 3d (first and first). 2 regions).

  Then, the uniformly distributed light is reflected by the first reflecting surfaces 3c and 3d in the light emitting direction L, so that the arc-shaped light emitting portion facing the first reflecting surfaces 3c and 3d is also uniform. The amount of light is directed. Thus, the light from the two light sources 1 is uniformly distributed to the ring-shaped light emitting portion extending in the circumferential direction CC by the first reflecting surfaces 3c and 3d and the second reflecting surface 3a provided for each light source 1. The light is distributed and emitted in the light emission direction L. The arc reflecting member 3 will be described in more detail later.

  The prism panel (first optical member) 4 is disposed in the light emitting portion formed in the light irradiation direction L with respect to the arc reflecting member 3. The prism panel 4 is manufactured to have a semicircular arc shape with a transparent resin material having high transmittance such as acrylic resin, and the two prism panels 4 are combined in a ring shape and used.

  Here, in a cross section orthogonal to the longitudinal direction of the light source 1, the light emitted from the light source 1 (reflected in the vicinity of the light source 1 in the reflector 2 and once returned to the inside of the light source 1, and then the light source 1 again. Is divided into four types of light beams that follow different optical paths. FIG. 5A shows three types of light beams L1, L2, and L3 among these light beams. The light beam L1 is a light beam that is emitted from the light source 1 and reaches the prism panel 4 without being reflected by the first reflecting surface 3c (3d) of the arc reflecting member 3. The light ray L2 is a light ray that is emitted from the light source 1 and is not reflected by the reflector 2 but is reflected by the first reflecting surface 3c (3d) of the arc reflecting member 3 and reaches the prism panel 4. The light beam L3 is a light beam that is emitted from the light source 1, reflected by the reflector 2, and then reflected by the first reflecting surface 3c (3d) of the arc reflecting member 3 to reach the prism panel 4. Although not shown, another type of light beam L4 is emitted from the light source 1 and reflected by the reflector 2 and then reflected on the prism panel 4 without being reflected by the first reflecting surface 3c (3d) of the arc reflecting member 3. The rays that arrive.

  On the incident surface of the prism panel 4, a prism row composed of a plurality of fine prism portions is formed. Each prism part of the prism array extends along the longitudinal direction (tangential direction T) of the light source 1, and the light that has arrived after being reflected by the first reflecting surfaces 3 c and 3 d of the arc reflecting member 3 out of the light from the light source 1. Is transmitted in the light irradiation direction L. Each prism portion reflects at least light that has arrived without being reflected by the first reflecting surfaces 3c and 3d in the light irradiation direction L. Specifically, as shown in FIGS. 5A and 5B, each prism unit includes a first surface 4a on which the light beam L1 is incident and a second surface 4b on which the light beams L2 and L3 are incident. Have. A light ray L4 (not shown) also enters the first surface 4a. When the surface along the radial direction R is set as a reference surface as shown by a one-dot chain line in FIG. 5B, the angle formed by the first surface 4a with respect to the reference surface (90 ° in this reference example) is: The second surface 4b is larger than an angle θ formed with respect to the reference surface.

  The light rays L2 and L3 incident on the second surface 4b are refracted there and transmitted through the prism panel 4, and further refracted by the emission surface (plane) 4c and emitted in the light irradiation direction L (diffuse panel 5 side). To do. At this time, when the light beams L2 and L3 are incident on the second surface 4b at a position close to the light source 1, the second surface is illustrated as shown in FIGS. 5A and 5B using the light beam L2 as an example. 4b is incident at a small incident angle. For this reason, the light beam is refracted so as to be inclined in the radial direction R with respect to the central axis BX on the second surface 4 b and is emitted from the prism panel 4. Further, when the light beams L2 and L3 are incident on the second surface 4b at a position away from the light source 1, the light beam L3 is shown as an example in FIG. Incident at a large incident angle. For this reason, the light beam is refracted almost parallel to the central axis BX on the second surface 4 b and exits from the prism panel 4.

  On the other hand, the first surface 4a refracts the incident light ray L1 (L4) and directs it toward the second surface 4b. The second surface 4b at this time is formed so as to satisfy the total reflection condition with respect to the light ray L1 (L4). For this reason, the light ray L1 is totally internally reflected by the second surface 4b, passes through the prism panel 4, and is emitted from the emission surface 4c in the light irradiation direction L (on the diffusion panel 5 side). As described above, the prism portion increases the utilization efficiency of the light emitted from the light source 1 by directing the light beam L1 that is not reflected by the first reflecting surface of the arc reflecting member 3 in the light irradiation direction L. .

  The emission angle of the light beam from the prism panel 4 varies depending on the position in the circumferential direction CC where the light beam (L1, L4) is incident on the prism panel 4. When the inclination angles of the first and second surfaces 4 a and 4 b are the same in the entire prism array, the incident angle of the light beam on the first surface 4 a close to the light source 1 is the first surface 4 a far from the light source 1. It becomes larger than the incident angle of the light beam. For this reason, the exit angle of the former ray from the exit surface 4c is larger than the exit angle of the latter ray. Thus, the emission direction of the light beam (L1, L4) changes according to the distance between the incident position of the light beam (L1, L4) on the prism panel 4 and the light source 1. However, the entire light flux that is a bundle of the light beams is converted into a light flux having a uniform light amount distribution in a range from a direction parallel to the central axis BX to a direction slightly inward in the radial direction R.

  In this reference example, as shown in FIG. 5B, the inclination angle θ formed by the second surface 4b with respect to a reference surface (indicated by a one-dot chain line in the drawing) along the radial direction R in the entire prism array. It is constant at 42.5 °. In this case, the incident angle (angle formed with respect to the normal of the reference surface) of the light beams (L1, L4) to the prism panel 4 is set to 47.5 ° or more, so that the light beams can be transmitted from the first surface 4a. The light can be incident on the prism portion, totally reflected by the second surface 4 b, and emitted from the prism panel 4. On the other hand, by making the incident angle of the light beam (L2, L3) to the prism panel 4 smaller than 47.5 °, the light beam is incident from the second surface 4b into the prism portion and refracted without being totally internally reflected. Can be emitted from the prism panel 4.

  Note that the second inclination angle θ is not limited to 42.5 °, and 90 °, which is the angle formed by the first surface 4a with respect to the reference surface, is only an example. Good.

  In addition, the prism row constituted by the prism portions extending along the longitudinal direction of the light source 1 is not necessarily formed on the entire incident surface of the prism panel 4, and may be formed at least in a partial region near the light source 1. Good.

  The diffusion panel (second optical member) 5 is disposed in the light irradiation direction L with respect to the prism panel 4 in the light emitting part. The diffusion panel 5 is made of a transparent resin material having a high transmittance such as acrylic resin, and the two diffusion panels 5 are combined in a ring shape. As shown in FIGS. 5A and 5B, a plurality of cylindrical lens portions (light diffusion portions) 5a extending in an arc shape in the circumferential direction CC are formed concentrically on the incident surface of the diffusion panel 5. Yes. Each cylindrical lens portion 5a has a function of refracting and diffusing the incident light beam in the radial direction R. The light beam refracted by the cylindrical lens unit 5a exits from the exit surface 5b of the diffusion panel 5 and irradiates the object scene (subject).

  Thus, the diffusion panel 5 is emitted from the light source 1 and proceeds in the circumferential direction CC, and diffuses the light whose direction is changed to the light irradiation direction L by the arc reflecting member 3 and the prism panel 4 in the radial direction R. Accordingly, macro shooting is performed on the size of the radial direction R of the light irradiation range, which is the range on the subject side irradiated with the illumination light, while hardly changing the emission direction of the light emitted from the prism panel 4 in the circumferential direction CC. The light quantity distribution can be made uniform in the radial direction R while expanding to a range suitable for. The combination of the diffusing panel 5 and the prism panel 4 efficiently guides light from the light source 1 to a light irradiation range suitable for macro photography, and performs illumination with a uniform light distribution in the light irradiation range. be able to.

  6 is an elastic holding member for fixing the light source 1 to the reflector 2, and 7 is a back surface for holding the mounting boards 9 and 10 on which the above-described members constituting the illumination optical system and the above-described electrical components are mounted. It is a cover. 8 is a front cover having a circular opening that covers the light source 1 and the reflector 2 portion of the front surface of the lighting device 101 and exposes the light emitting portion where the two prism panels 4 and the diffusion panel 5 are respectively disposed. is there. An engaging portion for holding the prism panel 4 and the diffusion panel 5 is formed on the inner periphery of the opening of the front cover 8.

  The reflector 2 covered by the front cover 8 and the light source 1 inside the reflector 2 are arranged at a position where they cannot be seen through the diffusion panel 5 and the prism panel 4 from the front side of the illumination device 101.

  Next, the shape and the like of the arc reflecting member 3 will be described in detail with reference to FIGS. 6 (a) and 6 (b). The arc reflecting member 3 includes an incident opening 3f into which an outer surface near the light exit opening of the reflector 2 is fitted, and a light source side reflecting surface 3c and an arc reflecting surface 3d, which are first reflecting surfaces, formed on the surface by metal deposition. Arc-shaped bottom surface portion 3g. The light source side reflecting surface 3c is configured as a part of a conical surface having an inclination of 45 ° with respect to the reference surface along the radial direction R in the central section passing through the center in the longitudinal direction of the light source 1 described above. .

  In addition, the arc reflection surface 3d is basically positioned in the light emission direction L (the height toward the light emission direction L increases as the distance from the light source 1 (reflective umbrella 2) increases in the circumferential direction CC). In addition, it is formed as a surface inclined with respect to a reference surface along the radial direction R. However, in this reference example, as shown in FIGS. 11A to 11D which are cross-sectional views taken along lines AA, BB, CC, and DD in FIG. The position (height) in the light irradiation direction L is different between the inner circumference side and the outer circumference side in the radial direction R of 3d (the inner circumference side is higher). In addition, the arc reflecting surface 3d is formed as a twisted spiral surface whose height on the outer peripheral side increases as it moves away from the reflector 2 in the circumferential direction CC while the height on the inner peripheral side is high. This is for avoiding that the light concentrates on the outer peripheral side of the arc reflecting surface 3d and the light traveling toward the inner peripheral side decreases. That is, the height of the area on the inner peripheral side of the arc reflecting surface 3d is increased from the side close to the reflector 2 (light source 1), and the light that has reached this area is actively emitted from the light emitting section (prism panel 4). Lead to. As a result, light having a uniform light amount distribution is emitted in the light irradiation direction L from the arc-shaped (ring-shaped) light emitting portion.

  The arc reflecting member 3 also includes two partition wall portions 3h in which two second reflecting surfaces 3a disposed between the light source side reflecting surface 3c and the two arc reflecting surfaces 3d are formed by metal deposition. .

  Furthermore, the arc reflecting member 3 also has an outer peripheral wall portion 3i that extends along the outer peripheries of the two arc reflecting surfaces 3d and in which the outer peripheral reflecting surface 3b is formed by metal vapor deposition on the inner peripheral surface. As can be seen from FIG. 9, a part of the light reflected by the second reflecting surface 3a is reflected by the outer reflecting surface 3b and then travels to the optical path region along the arc reflecting surface 3d. Thereby, the light from the light source 1 can be made to reach | attain the optical path area | region farther from the light source 1 in the circumferential direction CC. In addition, there is also light that reaches the outer peripheral reflection surface 3b directly from the light source 1 or the reflector 2 and reflects there. The outer peripheral reflecting surface 3b can make this light reach the region of the prism panel 4 that is further away from the light source 1 in the circumferential direction CC.

  In addition, since the outer peripheral reflection surface 3b is provided, leakage of light emitted from the light source 1 to the outside of the arc reflection member 3 is also prevented.

  The arc reflecting member 3 is also provided with an inner peripheral wall portion 3j extending along the inner periphery of the light source side reflecting surface 3c and the two arc reflecting surfaces 3d. A reflection surface is also formed on the inner surface of the inner peripheral wall portion 3j by metal vapor deposition. The light emitting portion, which is an arc-shaped (ring-shaped) opening formed between the inner peripheral wall portion 3j and the outer peripheral wall portion 3i, has substantially the same shape as the arc-shaped outer shapes of the prism panel 4 and the diffusion panel 5. doing. Thereby, the light emitted from the light source 1 can be efficiently guided to the prism panel 4 and the diffusion panel 5.

  A portion of the outer peripheral wall 3 b close to the light exit opening of the reflector 2, that is, a portion from the light source 1 to the arc reflecting member 3 extends in the tangential direction of the outer peripheries of the arc-shaped prism panel 4 and the diffusing panel 5. ing. Thereby, it can utilize efficiently, without interrupting the light from the light source 1. FIG.

  Next, the description of the prism panel 4 will be supplemented. As described above, a plurality of prism portions extending along the longitudinal direction of the light source 1 are formed on the incident surface (surface on the light source 1 side) of the prism panel 4 so as to form a prism row. A first surface 4a that functions as a transmission surface is formed on the side close to the light source 1 in each prism portion, and a second surface that functions as a transmission surface and an internal total reflection surface behind it (side far from the light source 1). 4b is formed.

  As shown in FIG. 12, the light (light rays L5 and L6) directed to the optical path region far from the light source 1 after being distributed to both sides in the circumferential direction CC by the two second reflecting surfaces 3a of the arc reflecting member 3 Most of the light enters the prism portion from the first surface 4a. Then, total internal reflection is performed on the second surface 4b, the direction is largely changed, and the light is emitted in the light irradiation direction L. The light beam L5 is a light beam that has been reflected by the second reflecting surface 3a and has reached the first surface 4a without being reflected by the arc reflecting surface 3d. The light beam L6 is a light beam that has been reflected by the second reflecting surface 3a and further reflected by the arc reflecting surface 3d to reach the first surface 4a. The light that reaches the first surface 4a hardly returns to the arc reflecting member 3 again.

  In this way, almost all of the light reflected by the second reflecting surface 3a of the arc reflecting member 3 and guided to the optical path region far from the light source 1 is different from the light in the region close to the light source 1. The light enters the prism panel 4 (prism portion) from the first surface 4a. And this light is direction-converted by the 2nd surface 4b, and is inject | emitted in the light irradiation direction L efficiently. The light emitted from the prism panel 4 is incident on the cylindrical lens portion 5a formed in the diffusion panel 5 so as to extend in the circumferential direction CC. However, the light emitted from the region far from the light source 1 in the prism panel 4 is incident on the cylindrical lens. Less susceptible to the refractive power of the portion 5a. For this reason, the light is emitted from the diffusion panel 5 in the light irradiation direction L without largely changing the traveling direction at the time of emission from the prism panel 4.

  Therefore, if light can be uniformly incident on the incident surfaces (the first surface 4a and the second surface 4b) over the entire prism panel 4, the arc-shaped (ring-shaped) light emitting portion is uniform from the entire surface. Light can be emitted with a light amount distribution. Further, by setting the angle formed with respect to the reference surface of the first surface 4a formed on the light source 1 side to 90 °, the light emitted from the light source 1 can be guided in the light irradiation direction L very efficiently. become.

  Furthermore, the amount of light incident on each region of the prism panel 4 can be adjusted by appropriately changing the shape of the arc reflecting surface 3 d of the arc reflecting member 3. As a result, even if there is an element that makes the light amount non-uniform in the light emission characteristics of the light source 1 or the reflection characteristics of the reflector 2, light can be emitted from the entire light emitting portion with a uniform light amount distribution. .

  In this reference example, two arc-shaped light emitting portions are combined to form a ring-shaped light emitting portion. However, at the boundary portion between the two light emitting portions, the light from one light emitting portion complements the light from the other light emitting portion, so that the light irradiation region can be illuminated uniformly without any breaks. Can do.

  As described above, according to the present reference example, the light from the light source 1 is reflected by the first reflecting surfaces 3c and 3d of the ring reflecting member 3 without using a curved tube type light source. It is possible to form a light emitting part extending in the direction. In addition, by guiding a part of the light from the light source in the circumferential direction CC by the second reflecting surface 3a of the arc reflecting member 3, it is possible to emit light uniformly from the light emitting portion. Thereby, the illuminating device which can perform the uniform illumination suitable for macro imaging | photography etc. using the light from the light source 1 efficiently is realizable.

  In this reference example, the light emitting portion of the illumination device has a ring shape (circular shape), but it may be rectangular or polygonal. Also in this case, the direction corresponding to the radial direction of the photographing lens in use (for example, the direction in which the diagonal line of the rectangle or polygon extends) can be referred to as the radial direction of the lighting device, and the direction surrounding the outer periphery of the photographing lens is the lighting device. It can be said that the circumferential direction.

  Further, in the present reference example, the arc reflecting surface 3d of the arc reflecting member 3 has a smoothly changing height in the light irradiation direction L in the circumferential direction CC, but even if the height is changed stepwise. Alternatively, the width in the radial direction R may be changed along with the height. Further, in the present reference example, the arc reflecting surface 3d of the arc reflecting member 3 is formed as a twisted spiral surface, but may be a spiral surface having no twist.

Furthermore, in this reference example, two light sources 1 are arranged in the circumferential direction CC, and two illumination optical systems (reflector 2, first reflection surfaces 3 c and 3 d, second reflection) are provided for the two light sources 1. The case where the surface 3a, the prism panel 4 and the diffusion panel 5) are configured has been described. However, the number of light sources and illumination optical systems is not limited to two, and may be one or may be three or more.
Further, the arc reflecting member 3, the prism panel 4, and the diffusing panel 5 are not necessarily configured according to the number of the light sources 1, and may be configured as one component regardless of the number of the light sources. Furthermore, the structure which integrated the reflector 2 and the circular-arc reflection member 3 may be sufficient.
(Reference Example 2)
Next, a macro photography illumination device 111 that is a reference example 2 of the present invention will be described with reference to FIG. This reference example is different from the reference example 1 in the auxiliary light emitting part for focus adjustment described in the reference example 1, and a part (two places) on the circular line from which the light emitting part (14) for emitting illumination light extends. And the illumination optical system and the entire illumination device 111 are downsized. Specifically, the light emission part (14) is formed in two circular arc shapes arranged from the complete ring shape as in Reference Example 1 with the arrangement region of the auxiliary light emitting units 21 and 22 interposed therebetween.

  FIGS. 14A and 14B each show a cross section of the illumination device 111 of the present reference example, taken along line AA shown in FIG. Further, on the upper side of FIG. 15A, the arc reflecting member 3 used in the lighting device 101 described in Reference Example 1 is shown as viewed from the front side (front side), and below the arc of Reference Example 1 is shown. The cross section when the reflecting member 3 is cut along the line EE in the upper drawing is shown enlarged. On the other hand, FIG. 15B shows the arc reflecting member 13 used in the illumination device 111 described in the present reference example as viewed from the front (front), and below the arc reflecting member of the present reference example. 13 is an enlarged view of a section taken along line FF in the upper drawing. FIG. 16A shows an enlarged part of the arc reflecting member 3 of the reference example 1, and FIG. 16B shows an enlarged part of the arc reflecting member 13 of the reference example. It shows. Further, in FIGS. 17A, 17B, 18A, and 18B, the illuminating device 111 of this reference example is shown by BB, CC, DD, and E in FIG. The cross section when cut | disconnected by the -E line | wire is shown. FIG. 19 is a ray tracing diagram of the illumination device of this reference example.

  The illumination device 111 of the present reference example is also detachably mounted on the outer periphery of the distal end portion of the photographing lens 201 as shown in FIG. Moreover, the illuminating device 111 is provided with the control part (not shown) connected by the connection cable 112 demonstrated in the reference example 1. FIG. Also in this reference example, when the illumination device 111 is mounted on the photographing lens 201, as shown in FIG. 13, the direction toward the object field photographed through the photographing lens 201 is the light irradiation direction L of the illumination device 111. Or forward. A direction corresponding to the radial direction of the photographing lens 201 is a radial direction R of the illumination device 111, and a direction surrounding the outer periphery of the photographing lens 201 is a circumferential direction CC of the illumination device 111. Furthermore, the direction in which the tangent of the outer periphery (circle) of the photographic lens 201 extends is referred to as a tangential direction T with respect to the circumferential direction CC. Further, the direction along the optical axis AX of the photographing lens 201 is referred to as the thickness direction of the illumination device 111.

  Since the configuration of the illumination optical system of the illumination device 111 of the present reference example is basically the same as that of the reference example 1, detailed description of the illumination optical system is omitted. In addition, the same components as those of the reference example 1 among the components of the reference example are denoted by the same reference numerals as those of the reference example 1, and the description thereof is omitted. The illumination device 111 of the present reference example also includes a central axis (axis that coincides with the lens optical axis in use) BX, and has a symmetric configuration with respect to a central plane on which two light sources are arranged on both sides. For this reason, below, it demonstrates focusing on the structure of one (left side) in the symmetrical structure, and demonstrates the structure of the other (right side) as needed.

  Reference numeral 12 denotes a reflector as a condensing member, which reflects light traveling in a direction other than the direction of the arc reflecting member 13 (to be described later) and the prism panel 14 (to be described later) out of the light emitted from the entire outer periphery of the straight tube type light source 1. It has a reflective surface 12a. Also in this reference example, the light source 1 and the reflector 12 are disposed on both sides of the central axis BX.

  The reflecting surfaces 12a of the reflector 12 are provided on both sides of the light source 1 in the thickness direction and on both sides in the longitudinal direction of the light source 1, and reflect the reflected light so as to be directed toward the arc reflecting member 13 and the prism panel 14. The light is emitted from a light exit opening formed between the tip portions of the reflecting surfaces 12a. Further, the reflector 12 emits the light emitted from the light source 1 toward the arc reflecting member 13 and the prism panel 14 from the light exit opening without reflecting.

  In addition, unlike the reflector 2 of the reference example 1, the reflector 12 of the present reference example is reflected along the semi-cylindrical surface on the opposite side to the light exit opening on the outer peripheral surface of the light source 1 in order to reduce the size. It has a semi-cylindrical portion (hereinafter referred to as a semi-cylindrical portion) 12b having a surface. Thereby, the light emitted from the light source 1 toward the semi-cylindrical portion 12b is reflected by the semi-cylindrical portion 12b and returned to the light source 1 again, and then heads toward the light emission opening. The reflection surface 12a closer to the light exit opening than the cylindrical portion 12b has a quadratic curve shape such as an ellipse in a cross section orthogonal to the longitudinal direction (tangential direction T) of the light source 1. In the case of a shape having an elliptical cross section, as in Reference Example 1, one focal point is arranged at the radial center of the light source 1 and the other focal point is on a first reflecting surface (described later) of the arc reflecting member 13 ( It is desirable to arrange on the first reflecting surface side. The manufacturing method of the reflecting umbrella 12 is the same as that of the reflecting umbrella of Reference Example 1.

  Reference numeral 13 denotes an arc reflecting member. As with the arc reflecting member 3 of Reference Example 1, one arc reflecting member 13 is provided for each of the two light sources 1 (two in total). As shown in detail in FIG. 15B, the arc reflecting member 13 is a reflecting surface formed so as to extend in the circumferential direction CC on the inner side in the radial direction R than the light source 1, and the light from the light source 1 (reflected) 1st reflective surfaces 13c and 13d which reflect the light reflected in the light irradiation direction L are included. The first reflecting surface has a light source side reflecting surface (first region) 13 c that is a portion facing the central portion in the longitudinal direction of the light source 1. Further, the first reflecting surface has two arc reflecting surfaces (second arcs) extending in an arc shape from the light source side reflecting surface 13c toward both sides in the circumferential direction CC, that is, away from the light source 1 in the circumferential direction CC. Area) 13d. An optical path region (space) is formed between the light source side and the arc reflecting surfaces 13c and 13d and a prism panel 14 (to be described later) arranged in the light emission direction L from them.

  In the present reference example, the auxiliary light emitting units 21 and 22 are disposed between the arc reflecting surfaces 13d of the two arc reflecting members 13 provided for the two light sources 1 (two places sandwiching the central axis BX). Compared to the arc reflecting member 3 of Example 1, the arc reflecting surface 13d has a shorter length in the circumferential direction CC. Further, the radial width of the arc reflecting surface 13d (that is, the light emitting portion) is also narrower than that of the reference example 1. This is not just a reduction in size, but when an arc-shaped light emitting part is configured, the light concentrates on the outer peripheral side and tends to reduce the light traveling toward the inner peripheral side. There is an effect that unevenness in the amount of light can be eliminated from the side.

  Further, the arc reflecting member 13 of the present reference example also has two second reflecting surfaces 13a, like the arc reflecting member 3 of the reference example 1. As shown in FIG. 19, the second reflecting surface 13a is a direction in which a part of the light traveling from the light source 1 toward the light source side reflecting surface 13c is separated from the light source 1 in the circumferential direction CC along the arc reflecting surface 13d. Reflected toward the optical path region extending to The role and arrangement of the two second reflecting surfaces 13a are the same as in Reference Example 1.

  In this reference example, since the reflector 12 is downsized compared to the reference example 1, the positions of the two focal points of the reflecting surface 12a are closer than those of the reference example 1. For this reason, the entire optical path length can be shortened. Further, as compared in FIGS. 15A and 15B, in this reference example, as the reflector 12 is downsized, the width of the arc reflecting member 13 in the radial direction R is set to the arc reflection of the reference example 1. It becomes possible to make it narrower than the width of the member 3. Therefore, in this reference example, the volume of the illumination optical system can be reduced as compared with the reference example 1, and as a result, the entire illumination device 111 can be reduced in size.

  Reference numeral 14 denotes a prism panel (first optical member), which is disposed in a light emitting portion formed in the light irradiation direction L with respect to the arc reflecting member 13. The prism panel 14 is manufactured to have a semicircular arc shape using a milky white optical material having a diffusibility for diffusing light, and two prism panels 14 are used for the illumination device 111.

  Here, this reference example is also the same as the reference example 1 in that light emitted from the light source 1 is divided into four types of light beams that follow different optical paths in a cross section orthogonal to the longitudinal direction of the light source 1. Also, as described in the reference example 1, a prism array including a plurality of fine prism portions is formed on the incident surface of the prism panel 14 of this reference example. The operation of each prism portion with respect to the four types of light beams is as described in Reference Example 1.

  In the present reference example, the light transmitted through the prism panel 14 is diffused in the radial direction R due to the diffusibility of the prism panel 14, so that the diffusion panel 5 used in the reference example 1 is not necessary. Thereby, the lighting device 111 can be downsized (thinned) in the thickness direction.

  Reference numeral 17 denotes a back cover for holding the above-described members constituting the illumination optical system and a mounting substrate 19 described later. Reference numeral 18 denotes a front cover that covers a portion of the light source 1 and the reflector 12 in the front surface of the illuminating device 111 and has a circular opening that exposes the light emitting portion on which the two prism panels 14 are arranged. An engaging portion for holding the prism panel 14 is formed on the inner periphery of the opening of the front cover 18. The reflector 12 covered by the front cover 18 and the light source 1 inside the reflector 12 are arranged at a position where they cannot be seen through the prism panel 14 from the front side of the illumination device 111.

  On the mounting substrate 19, electrical components 20 such as a trigger coil for starting light emission of the light source 1 and a light receiving sensor for monitoring the light emission amount from the light source 1 are mounted.

  The auxiliary light emitting units 21 and 22 include an LED 24 serving as a light source and a condensing lens disposed on the front surface thereof, and condenses the light emitted from the LED 24 by the condensing lens and irradiates the subject. Reference numeral 23 denotes a lock release button that is operated when releasing the lock state of the lock mechanism for mounting to the taking lens provided in the illumination device 111.

  Next, the shape and the like of the arc reflecting member 13 will be described in detail with reference to FIG. 15B and FIG. The arc reflecting member 13 includes an incident opening 13f into which an outer surface near the light exit opening of the reflector 12 is fitted, and a light source side reflecting surface 13c and an arc reflecting surface 13d, which are first reflecting surfaces, formed on the surface by metal deposition. Arc-shaped bottom surface portion 13g. Similar to Reference Example 1, the light source-side reflecting surface 13c is a part of a conical surface having an inclination of 45 ° with respect to the reference surface along the radial direction R in the central section passing through the center of the light source 1 in the longitudinal direction. It is configured as.

  Further, similarly to the first reference example, the arc reflecting surface 13d is basically positioned in the light emitting direction L as it moves away from the light source 1 (reflecting umbrella 12) in the circumferential direction CC (toward the light emitting direction L side). It is formed as a surface inclined with respect to the reference surface along the radial direction R so that the height becomes higher. Further, in this reference example, as in Reference Example 1, FIGS. 14A and 17A are cross-sectional views taken along lines AA, BB, CC, and DD in FIG. ), (B) and FIG. 18A, the arc reflecting surface 13d is formed as a twisted helical surface.

  However, in this reference example, as shown in the lower diagram of FIG. 15B and FIG. 16B, the arc reflecting surface 13d has a central portion in the radial direction R (width direction) with respect to the portions on both sides thereof. It is formed by a curved surface that becomes concave toward the light emitting portion (light irradiation direction L). For comparison with the lower drawing of FIG. 15A and FIG. 16A, an arc reflecting surface 3d in Reference Example 1 is shown, and the arc reflecting surface 3d is formed as a flat surface. .

  The arc reflecting surface 13d is thus formed as a concave curved surface for the following reason. In this reference example, as the illumination optical system is downsized, the light source 1 is closer to the inner peripheral wall portion 13j of the arc reflecting member 13 than the arc reflecting member 3 of the reference example 1, so that the light from the light source 1 is a light emitting portion. It is difficult to wrap around to the back of the circumferential direction CC (region far from the light source 1). For this reason, the arc reflecting surface 13d is formed as a curved surface that is concave in the width direction to widen the space through which light passes, so that the light from the light source 1 can easily go around to the back of the light emitting portion. A uniform light amount distribution is obtained throughout.

  Note that the arc reflecting surface 13d does not necessarily have to be formed as a curved surface having the most concave center in the width direction, and the most concave portion may be biased to one side in the width direction. Further, the shape of the arc reflecting surface 13d in the width direction may change in the circumferential direction CC.

  The arc reflecting member 13 also includes two partition walls 13h in which two second reflecting surfaces 13a disposed between the light source side reflecting surface 13c and the two arc reflecting surfaces 13d are formed by metal deposition. .

  Further, the arc reflecting member 13 also has an outer peripheral wall portion 13i that extends along the outer peripheries of the two arc reflecting surfaces 13d and has an outer peripheral reflecting surface 13b formed on the inner peripheral surface by metal vapor deposition. As can be seen from FIG. 19, a part of the light reflected by the second reflecting surface 13a is reflected by the outer peripheral reflecting surface 13b and then travels to the optical path region along the arc reflecting surface 13d. In addition, there is also light that directly reaches the outer reflection surface 13b from the light source 1 or the reflector 12 and reflects here, and the outer reflection surface 13b separates this light from the light source 1 in the prism panel 14 in the circumferential direction CC. Can reach a certain area.

  The inner peripheral wall portion 13j extends along the inner periphery of the light source side reflecting surface 13c and the two arc reflecting surfaces 13d. An inner peripheral reflection surface is also formed on the inner surface of the inner peripheral wall portion 13j by metal vapor deposition. In this reference example, the width of the prism panel 14 is set to the width in the radial direction R of the light emitting portion which is an arcuate opening formed between the inner peripheral wall portion 13j and the outer peripheral wall portion 13i. It is getting bigger. However, the width of the light emitting portion in the radial direction R may correspond to the width of the prism panel 14.

  Also in this reference example, the portion of the outer peripheral wall portion 13b close to the light exit opening of the reflector 12, that is, the portion from the light source 1 to the arc reflecting member 13 is tangent to the outer periphery of the arc-shaped prism panel 14. Extending in the direction. Thereby, it can utilize efficiently, without interrupting the light from the light source 1. FIG.

  As described above, also in this reference example, similarly to the reference example 1, the light from the light source 1 is reflected by the first reflecting surfaces 13c and 13d of the arc reflecting member 13 without using the curved tube type light source. By doing so, the light emission part extended in the circumferential direction can be formed. In addition, by guiding a part of the light from the light source in the circumferential direction CC by the second reflecting surface 13a of the arc reflecting member 13, the light can be emitted uniformly from the light emitting portion. Thereby, the illuminating device which can perform the uniform illumination suitable for macro imaging | photography etc. using the light from the light source 1 efficiently is realizable.

  In the illumination device 111 of the present reference example, the reflector 12 is formed with a semi-cylindrical portion 12b along the outer peripheral surface of the light source 1, and by shortening the focal length of the elliptical shape, the diameter is larger than that of the reference example 1. Miniaturization in the direction is realized. Further, as compared with the reference example 1, the width of the arc reflecting member 13 in the radial direction R is narrowed so that the distance between the central axis BX and the light source 1 is shortened (the light source 1 is brought close to the lens optical axis). A reduction in size in the radial direction of 111 is realized.

  Further, in this reference example, the light emitting unit from which the illumination light from the light source 1 is emitted and the auxiliary light emitting units 21 and 22 are efficiently arranged on the same circular line, so that the illumination optical system and the illumination device 111 Miniaturization is realized. In addition, as the illumination optical system becomes smaller, a new space can be formed on the back side of the illumination optical system in the illumination device 111. In the present reference example, a mounting board 19 on which the electrical component 20 is mounted is disposed in this back space. In other words, the mounting substrate 19 similar to the mounting substrate 9 disposed on the upper side of the light emitting portion (outside in the radial direction R) in the reference example 1 is disposed in the back space, so that the light emission in the reference example 1 is achieved. The size of the lighting device 111 is reduced by eliminating the large protruding portion on the upper side of the portion.

  Hereinafter, Example 1 of the present invention as a modification of Reference Example 2 described above will be described. In the following description, although the light irradiation direction L, the radial direction R, the circumferential direction CC, the tangential direction T, and the central axis BX shown in Reference Example 2 are not shown, they have the same meaning and the same reference numerals. Use. Also, the thickness direction is used in the same meaning.

  Since the illumination device 131 of the present embodiment also has a symmetric configuration with respect to the central plane that includes the central axis BX and two light sources are arranged on both sides, the following description will focus on one configuration in the symmetric configuration. Then, the other configuration will be described as necessary.

  FIG. 20 shows the lighting device of this embodiment as viewed from the front (front), and FIG. 21 shows the exploded lighting device 131. Further, FIG. 22 shows the internal configuration of the lighting device 131 of this embodiment as viewed from the front, and FIG. 23 shows a part of the cross section of the lighting device 131 of this embodiment (in FIG. 25A). (Encircled part) is shown enlarged.

  FIG. 24 shows the arc reflecting member 33 of the present embodiment as viewed from an oblique direction. FIGS. 25A and 25B are cross sections of the illumination device 131 of the present embodiment, respectively, taken along lines AG-AG and AI-AI shown in FIG. FIGS. 26A and 26B are cross sections of the illumination device 131 of the present embodiment, respectively, taken along lines AJ-AJ and AH-AH shown in FIG. . Further, FIG. 27 shows a part of the lighting device 131 of the present embodiment cut along the line BD-BD shown in FIG.

  In these drawings, 1 is a light source, 32 is a reflector as a light collecting member, and 33 is an arc reflecting member as a reflecting member. Reference numeral 34 denotes a prism panel as an optical member (first optical member), and reference numeral 35 denotes a diffusion panel as an optical member (second optical member). Reference numeral 37 denotes a back cover, and reference numeral 38 denotes a front cover. These components basically have the same functions as the components having the same names shown in Reference Example 2 or Reference Example 1. However, the shape and arrangement are different from those of Reference Example 2 and Reference Example 1, and will be described below. Reference numerals 21 and 22 denote auxiliary light emitting units described in Reference Example 2, and description thereof will be omitted.

  The reflector 32 reflects a reflection surface that reflects light traveling in a direction other than the direction of the arc reflecting member 33 (described later) and the prism panel 34 (described later) out of the light emitted from the entire outer periphery of the straight tube type light source 1 in the thickness direction. In both sides of the light source 1 and both sides of the light source 1 in the longitudinal direction. Among these, as shown in FIG. 23, the reflecting surfaces 32a and 32b are two reflecting surfaces formed on the light irradiation direction L side and the opposite side from the light source 1 in the thickness direction. Between the front ends of the reflection surfaces 32a and 32b (and the reflection surfaces on both sides in the longitudinal direction of the light source 1), the light emitted from the light source 1 and reflected by each reflection surface and the light that has traveled without reflection are arcuate. A light exit opening 32d that exits in the direction of the reflecting member 33 or the prism panel 34 is formed.

  Note that the reflector 32 of the present embodiment also has a semi-cylindrical surface on the opposite side of the light emission opening 32d on the outer peripheral surface of the light source 1 in order to reduce the size, similarly to the reflector 12 of Reference Example 2. A semi-cylindrical portion 32c having a reflective surface is formed.

  In the cross section along the thickness direction shown in FIG. 23, the reflector 32 (reflecting surfaces 32a and 32b) has a diameter direction SS (SS in the figure) in the center of the light emission range emitted from the light emission opening 32d. It arrange | positions so that it may incline to the opposite side (backward) to the light irradiation direction L side toward the inner side of the direction R. RF in FIG. 23 indicates a reference plane along the radial direction R. The direction (SS) of the center of the emission range has an inclination angle α with respect to the reference plane RF.

  Furthermore, the reflection surfaces 32 a and 32 b of the reflector 32 have shapes along two planes (virtual planes) that are symmetrical with respect to the symmetry plane SS that passes through the light source 1. That is, the actual shapes of the reflecting surfaces 32a and 32b are different from each other as will be described later, but the surface shape serving as the base is symmetrical with respect to the symmetry plane SS. The virtual surface of the present embodiment is a quadratic curve such as an ellipse. And the reflector 32 is arrange | positioned so that the symmetry plane SS may incline toward the inner side of the radial direction R on the opposite side (back) from the light irradiation direction L side. That is, the symmetry plane SS has an inclination angle α with respect to the reference plane RF. When the virtual surface is elliptical, it is desirable that one of the focal points of the ellipse is located at the radial center of the light source 1 and the other focal point is on a light source side reflecting surface 33c of an arc reflecting member 33 described later.

  As described above, the arrangement of the reflector 32 in which the direction of the center of the light emission range or the symmetry plane SS is inclined backward is referred to as a backward inclined arrangement in the following description.

  FIG. 28B shows an example (experimental example) of an emission range of light emitted from the light emission opening 32d of the reflector 32 that is rearwardly inclined. HD in the figure indicates the emission range (light quantity distribution) in the longitudinal direction (left-right direction) of the light source 1. Further, VD in the figure indicates an emission range (light quantity distribution) in the thickness direction (front-rear direction). As for the thickness direction, 0 (deg) in the figure corresponds to the reference plane RF shown in FIG. 23, and the direction (SS) of the center of the emission range VD is behind (0 in the figure). (Shown as DOWN) has an inclination of 20 (deg). As for the longitudinal direction of the light source 1, the direction of the center of the emission range HD is 0 (deg).

  In FIG. 28A, the direction (SS) of the center of the light emission range VD emitted from the light emission opening is the reference plane RF in the cross section along the thickness direction of the reflector as in Reference Example 2. An example (experimental example) of the injection range in the case of arranging in a direction 0 (deg) along the direction is shown as a comparative example. In this case, the symmetry plane SS has no inclination with respect to the reference plane RF. As for the longitudinal direction of the light source 1, the direction of the center of the emission range HD is 0 (deg) as in the case of the backward tilt arrangement.

  Here, the arc reflecting member 33 has a light source side reflecting surface 33c facing the central portion in the longitudinal direction of the light source 1 and a circumferential direction CC from the light source side reflecting surface 33c, near the inner end in the radial direction R of the reflector 32. And two arc reflecting surfaces 33d extending in an arc shape toward both sides of the same. Since the reflector 32 is tilted backward as described above, the light source 1 is placed on the light source side reflecting surface 33c of the arc reflecting member 33 together with the reflector 32, as compared with the configuration of the reference example 2 shown in FIG. You can get closer. That is, the illumination optical system and further the illumination device 131 can be downsized in the radial direction R. Moreover, the light source side reflecting surface 33c can be made to be a reflecting surface having an inclination angle smaller than 45 ° with respect to the reference surface along the radial direction R by the rearward tilt arrangement of the reflector 32. For this reason, compared with the case where the light source side reflecting surface is a reflecting surface having an inclination angle of 45 ° as in Reference Example 2, the thickness of the arc reflecting member 33 can be reduced. As a result, as will be described later, it is possible to arrange another component having a relatively large volume on the back surface side of the arc reflecting member 33.

  By the way, since the reflector 32 approaches the light source side reflecting surface 33c of the arc reflecting member 33, the following problems occur. When the reflection surface 32b opposite to the light emission direction L is extended from the light source 1 in the same manner as in Reference Example 2, in order to avoid interference between the reflection surface 32b and the light source side reflection surface 33c, arc reflection is performed. It becomes necessary to move the member 33 backward. As a result, the thickness of the illumination optical system increases, leading to an increase in the size of the illumination device 131 in the thickness direction.

  In order to prevent such an increase in thickness, in this embodiment, in the radial direction R, the length Lb of the reflecting surface 32b from the light source 1 is changed from the light source 1 of the reflecting surface 32a provided on the light irradiation direction L side. It is shorter than the length La. As shown in FIG. 27, when the portion of the reflecting surface 32b that extends toward the arc reflecting surface 33d does not interfere with the arc reflecting surface 33d, the length Lb of the portion that extends toward the light source side reflecting surface 33c. You may shorten only. In this case, when the reflection surface 32b is viewed from the thickness direction, the inner front end portion in the radial direction R is formed in a concave shape.

  On the other hand, if the reflection surface 32a provided on the light irradiation direction L side is shortened to the length from the light source 1 to the length of the reflection surface 32b from the light source 1, the reflector 32 becomes the reflector 32 from the light source 1. The function of converging diverging light cannot be performed sufficiently. For this reason, as shown in FIG. 22, the reflection surface 32a is formed in an arc shape so as to extend the inner end portion in the radial direction R as far as possible inside the radial direction R, and along the outer periphery P of the light emitting portion. doing. The light emitting portion referred to here is an arc-shaped or ring-shaped region that is formed on the light irradiation direction L side with respect to the arc reflecting member 33 and emits light toward the object field. A panel 34 and a diffusion panel 35 are arranged. However, the width in the radial direction R of the light emission region in the present embodiment is narrower than the width in the radial direction R of the prism panel 34 and the diffusion panel 35, as in Reference Example 2. The width of the portion of the first reflecting surface (arc reflecting surface) 33d of the arc reflecting member 33 that is separated from the vicinity of the light source 1 in the circumferential direction CC is substantially the same.

  One arc reflection member 33 is provided for each of the two light sources 1 (two in total). As shown in detail in FIG. 24, the arc reflecting member 33 is a reflecting surface formed so as to extend in the circumferential direction CC on the inner side in the radial direction R than the light source 1. The first reflecting surfaces 33c and 33d are provided for reflecting the reflected light (including the reflected light) in the light irradiation direction. The first reflecting surface has a light source side reflecting surface (first region) 33 c that is a portion facing the central portion in the longitudinal direction of the light source 1. Further, the first reflecting surface has two arc reflecting surfaces (second arcs) extending in an arc shape from the light source side reflecting surface 33c toward both sides in the circumferential direction CC (so as to move away from the light source 1 in the circumferential direction CC). Region) 33d. An optical path region (space) is formed between the light source side and the arc reflecting surfaces 33c and 33d and a prism panel 34 (to be described later) arranged in the light emission direction L from them.

  The light source side reflecting surface 33c is configured as a part of a conical surface having an inclination of an angle smaller than 45 ° with respect to a reference surface along the radial direction R in a central section passing through the center in the longitudinal direction of the light source 1. Yes.

  In addition, the arc reflection surface 33d is basically positioned in the light emission direction L (the height toward the light emission direction L increases as the distance from the light source 1 (reflective umbrella 32) increases in the circumferential direction). The surface is inclined with respect to the reference plane along the radial direction R. In this embodiment, unlike Reference Example 2, as shown in FIGS. 25 (a), 25 (b) and FIGS. 26 (a), (b), the arc reflecting surface 33d is formed into a spiral surface (diameter without twist). A spiral surface along the direction R). However, the portion 33d ′ adjacent to the light source side reflection surface 33c across the second reflection surface 32a described later of the arc reflection surface 33d is 45 ° with respect to the reference surface, similarly to the light source side reflection surface 33c. It is constructed as part of a conical surface with a small angle of inclination. This is because, in order to efficiently reflect light from the light source 1 in the optical path region of the arc reflecting surface 33d that is further away from the light source 1 in the circumferential direction CC than the conical surface portion 33d ', a lock mechanism described later is used as an arc reflecting member. This is for forming a space to be disposed on the back surface side of the 33 conical surface portion 33d '. The arrangement space for the lock mechanism will be described in detail later.

  Further, in the arc reflecting surface 33d, a portion 33d ″ on the outer peripheral side of the conical surface portion 33d ′ extends along the reference plane in order to spread light to a portion away from the light source 1 in the optical path region extending in the circumferential direction CC. It is formed as a flat surface and widens the space facing this portion 33d ″. Further, by making the portion 33d ″ as a plane, it is possible to avoid the interference with the reflection surface 32b of the reflector 32 described above.

  Further, similarly to the reference example 2, the arc reflecting member 33 includes two second reflecting surfaces 33a formed so as to sandwich the light source side reflecting surface 33c. The second reflecting surface 33a directs a part of the light traveling from the light source 1 toward the light source side reflecting surface 33c toward an optical path region extending in the direction away from the light source 1 in the circumferential direction CC along the arc reflecting surface 33d. reflect.

  In addition, similarly to the arc reflecting member 13 of the reference example 2, the arc reflecting member 33 has an outer peripheral reflecting surface and an inner peripheral reflecting surface.

  In FIG. 21, reference numeral 31 denotes a cylindrical cover attached to the front end portion of the central cylindrical portion of the back cover 37 (the portion attached to the outer periphery of the photographing lens), and two circular arc reflections surround the outer periphery of the cylindrical cover 31. A member 33 is arranged. Reference numeral 39 denotes a mounting board on which electrical components such as a trigger coil for starting light emission of the light source 1 and a light receiving sensor for monitoring the light emission amount from the light source 1 are mounted as described in the reference example 2. .

  Reference numerals 42 denote locking hooks disposed at four locations in the circumferential direction CC in the vicinity of the cylindrical portion of the back cover 37. Hereinafter, the lock mechanism including the locking hook 42 will be described with reference to FIG. The lock mechanism is a mechanism for setting (locking) the illumination device 131 disposed on the outer periphery of the distal end portion of the photographic lens 201 to be held by the photographic lens 201.

  Each locking hook 42 rotates around the rotation shaft 42a in a direction protruding to the inside of the cylindrical portion of the back cover 37 (hereinafter referred to as a locking direction) and a direction of retreating therefrom (hereinafter referred to as a lock releasing direction). The back cover 37 is movably attached. FIG. 29A shows a locked state in which the locking hook 42 rotated in the locking direction protrudes inside the cylindrical portion of the back cover 37 and engages with an engagement groove (not shown) formed on the outer peripheral surface of the photographing lens 201. Is shown. In the locked state, the illuminating device 131 is fixed to the photographing lens 201 by the engagement between the locking hook 42 and the engaging groove portion of the photographing lens 201. FIG. 29B shows an unlocked state in which the locking hook 42 rotated in the unlocking direction is retracted from the inside of the cylindrical portion of the back cover 37 and detached from the engaging groove portion of the photographing lens 201.

  Reference numeral 45 denotes a lock spring as an urging member that urges the locking hook 42 in the locking direction. In this embodiment, one lock spring 45 is provided for the two locking hooks 42. Each lock spring 45 has a cylindrical portion attached to the back cover 37, and two arm portions extending from the cylindrical portion engage with separate locking hooks 42, respectively. Is pushing.

  Reference numeral 41 denotes an unlocking ring, which is disposed so as to be rotatable around the outer periphery of the cylindrical cover 31. Although not shown in the drawings, the lock release ring 41 is formed with a cam surface that rotates the locking hook 42 in the unlocking direction. As described above, a cam follower portion (not shown) is formed on the opposite side of the locking hook 42 with respect to the front end portion protruding or retracting from the inside of the cylindrical portion of the back cover 37 with the rotating shaft 42a interposed therebetween. Has been.

  Reference numeral 43 denotes a lock release button, which is operated so as to be pushed in the radial direction R by the user when the locked state of the locking hook 42 is released. Reference numeral 44 denotes a connecting member, which is a member for converting the movement of the unlocking button 43 in the radial direction R into rotation of the unlocking ring 41. The connecting member 44 is rotatably attached to the back cover 37, one end is inserted inside the lock release button 43, and the other end is rotatably connected to the lock release ring 41. .

  When the unlocking button 43 is pushed in the locked state and the connecting member 44 rotates with respect to the back cover 37, the rotation of the connecting member 44 is transmitted to the unlocking ring 41, and the unlocking ring 41 is It rotates relative to the back cover 37. When the unlocking ring 41 rotates, the cam surface described above pushes the cam follower portion provided on the locking hook 42 inward in the radial direction R, so that the locking hook 42 is unlocked against the urging force of the lock spring 45. Turn to. Thereby, the illumination device 131 can be detached from the photographing lens 201.

  Here, the relationship between the locking mechanism and the previously described arc reflecting member 33 will be described with reference to FIGS. 23, 25A, 26A, and 26B. As shown in these drawings, on the back surface side of the conical surface portion 33d ′ of the arc reflecting surface 33d of the arc reflecting member 33, the inner peripheral side portion in the radial direction R is on the outer peripheral side than the inner peripheral side portion. A retracting portion 33f is formed which is located on the light irradiation direction L side as compared with the above portion. In other words, in order to form the retracting portion 33f, the conical surface portion 33d ′ is provided on the arc reflecting surface 33d which is a spiral surface along the radial direction R. Of the lock mechanism, the unlocking ring 41, the lock spring 45, and the locking hook 42 are arranged in a region (space) facing the retracting portion.

  As described above, the arc reflecting member 33 itself can be thinned, and the retracting portion 33f is formed on the back surface side of the arc reflecting member 33, so that a large component such as a lock mechanism can be made thicker. Without increasing, it can be arranged on the back surface side of the arc reflecting member 33. Further, by arranging the lock mechanism on the back surface side of the arc reflecting member 33 in this way, it is possible to reduce the size of the lighting device 131 in the radial direction R.

  The prism panel 34 is disposed in a light emitting portion formed in the light irradiation direction L with respect to the arc reflecting member 33. The prism panel 34 is manufactured to have a semicircular arc shape with a transparent resin material having high transmittance such as acrylic resin, and the two prism panels 34 are used in combination in a ring shape. As shown in FIG. 30A, on the incident surface (surface on the light source 1 side) of the prism panel 34, as in the prism panel 4 described in Reference Example 1, a prism composed of a plurality of fine prism portions. Rows 34a and 34b are formed. Each prism part has the same function as the prism part of the prism panel 4 of Reference Example 1. That is, each prism portion transmits light, which has been reflected by the arc reflecting surface 33d of the arc reflecting member 33 out of the light emitted from the light source 1 (the reflector 32), in the light irradiation direction L, and at least the arc reflecting surface 33d. The light that has arrived without being reflected by is totally internally reflected in the light irradiation direction L.

  However, the prism row 34a in this embodiment and the prism row 34b provided at a position farther from the light source 1 in the circumferential direction CC than the prism row 34a are different in the extending direction of the prism portion constituting the prism row 34a. The boundary between the prism row 34 a and the prism row 34 b is a position of about 45 ° in the circumferential direction CC from the position corresponding to the center in the longitudinal direction of the light source 1. Each prism part (first prism part) constituting the prism row 34a is formed of the light source 1 as shown in FIG. 30C, which is a cross-sectional view taken along the line AO-AO in FIG. It is formed so as to extend along the longitudinal direction. On the other hand, each prism part (second prism part) constituting the prism row 34b has a diameter as shown in FIG. 30 (d) which is a cross-sectional view taken along the line AP-AP in FIG. 30 (a). It is formed to extend in the direction R. In the prism panel 34, such prism rows 34a and 34b are provided on both sides in the circumferential direction CC with the region 34c facing the light source side reflecting surface 33c of the arc reflecting member 33 in the prism panel 34 interposed therebetween. . And the area | region 34c which opposes the light source side reflective surface 33c, ie, the area | region close | similar to the center of the longitudinal direction of the light source 1 rather than the prism row | line | column 34a, is sectional drawing along the AN-AN line in Fig.30 (a). As shown in 30 (b), this is a region where no prism portion is provided. The exit surface of the prism panel 34 is a flat surface.

  In the region close to the light source 1 where the prism row 34a is formed, the light beam from the light source 1 is still before going into the back of the arc-shaped optical path region. For this reason, it is preferable to form the prism part which comprises the prism row 34a so that it may extend in the longitudinal direction of the light source 1 so that the incident angle of the light ray in the direction where this prism part extends may become small. Thereby, it can avoid that the light ray which went to each prism part will be reflected. In other words, the direction changing function by total internal reflection of the prism portion can be effectively applied to the light beam from the light source 1.

  On the other hand, in the region far from the light source 1 where the prism row 34b is formed, the light beam from the light source 1 wraps around the arc-shaped optical path region. For this reason, it is preferable to form the prism part which comprises the prism row 34b so that it may extend in the radial direction R for the same reason as the prism row 34a.

  In this embodiment, since the reflector 32 is tilted backward, most of the light rays incident on the region 34c facing the light source side reflection surface 33c are light rays reflected by the light source side reflection surface 33c. For this reason, the direction change by a prism part is unnecessary. Therefore, it is not necessary to form a prism portion in this region 34c.

  Similar to the diffusion panel 5 described in Reference Example 1, the diffusion panel 35 is an optical member in which a plurality of cylindrical lens portions 35a extending concentrically in the circumferential direction CC are formed on the incident surface. The diffusion panel 35 diffuses the light emitted from the prism panel 34 uniformly in the light irradiation range suitable for macro photography by the action of the cylindrical lens portion 35a.

  According to the present embodiment, similarly to Reference Examples 1 and 2, the light from the light source 1 is reflected by the first reflecting surfaces 33c and 33d of the arc reflecting member 33 without using a curved tube type light source. Thus, a light emitting portion extending in the circumferential direction can be formed. In addition, by guiding a part of the light from the light source 1 in the circumferential direction CC by the second reflecting surface 33a of the arc reflecting member 33, it is possible to emit light uniformly from the light emitting portion. Thereby, the illuminating device which can perform the uniform illumination suitable for macro imaging | photography etc. using the light from the light source 1 efficiently is realizable.

  In addition, since the reflector 32 is tilted backward, the illumination optical system can be reduced in size and thickness in the radial direction R. And by making the illumination optical system thinner, it becomes possible to arrange the lock mechanism in the newly formed space on the back side of the illumination optical system, compared with the case where these are arranged shifted in the radial direction, Further downsizing of the lighting device in the radial direction is possible.

  In this embodiment as well, as described in Reference Example 1, the light emitting portion of the lighting device may be rectangular or polygonal instead of ring-shaped.

  FIG. 31A shows a prism diffusion panel 74 as an optical member used in the illumination apparatus that is Embodiment 2 of the present invention. The prism diffusion panel 74 is used in place of the prism panel 34 and the diffusion panel 35 in the illumination device described in the first embodiment.

  The incident surface (surface on the light source 1 side) of the prism diffusion panel 74 is implemented as shown in the lower diagram of FIG. 31 (b) (cross-sectional view taken along line BB in FIG. 31 (a)). A prism row 74a similar to the prism rows 34a and 34b described in Example 1 is formed. In addition, a region 74c of the incident surface of the prism diffusing panel 74 that faces the light source side reflecting surface 33c described in the first embodiment is an upper diagram of FIG. 31B (A-A line in FIG. 31A). As shown in (a cross-sectional view), it is a region where no prism portion is provided.

  On the other hand, a plurality of cylindrical lens portions 74b extending concentrically in the circumferential direction CC are formed on the entire exit surface of the prism diffusion panel 74. Each cylindrical lens portion 74b has a convex shape toward the light emission direction L. The cylindrical lens unit 74b uniformly diffuses the light emitted from the prism diffusion panel 74 and traveling in the light irradiation direction L to a light irradiation range suitable for macro photography.

  As shown in FIG. 31C, a plurality of cylindrical lens portions 74d having a concave shape in the light exit direction L are formed on the exit surface of the prism diffusion panel 74 so as to extend concentrically in the circumferential direction CC. May be.

  Thus, in this embodiment, the prism diffusion panel 74 in which the prism array 74a for changing the direction of the light beam is formed on the incident surface and the cylindrical lens portions 74b and 74d for diffusing the light beam on the exit surface is used. Thereby, compared with the case where the two optical members of the prism panel 34 and the diffusion panel 35 are used in the thickness direction as in the first embodiment, the lighting device can be made thinner.

  Instead of the prism diffusing panel 74 of this embodiment, as described in Reference Example 2, a prism panel formed of a milky white optical material having diffusibility may be used.

  Subsequently, the relationship between the electrical component on the mounting substrate 39 and the arc reflecting member 33 in the lighting apparatus of the first embodiment (or the second embodiment) will be described as a third embodiment with reference to FIGS. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description is omitted.

  FIG. 32 shows the internal configuration of the illumination device 131 shown in FIG. The two mounting boards 39 provided separately for the two light sources 1 are respectively provided on the back side of the arc reflecting member 33 provided for the corresponding light source 1 (on the light emission direction L side in the thickness direction). Is arranged on the opposite side).

Reference numeral 55 denotes a trigger coil for starting light emission (discharge) of the light source 1, which is mounted on each of the two mounting boards 39 provided for the two light sources 1. A light receiving sensor 56 monitors (detects) the light emission amount of the light source 1 and is mounted on each of the two mounting boards 39. Reference numeral 57 denotes a connector to which a plurality of conductors in a connecting cable for connecting the lighting device to a control unit (not shown) described in Reference Example 2 is connected. The connector 57 is mounted on one of the two mounting boards 39. In the trigger coil 55, the electric charge from the trigger capacitor in the control unit flows through the connection cable and the connector 57. The output of the light receiving sensor 56 is sent to the control unit via the connector 57 and the connecting cable.
Note that the output of the light receiving sensor 56 may be output via a separate cable in the connection cable, not via the connector 57.

  In the first embodiment, the reflector 32 is tilted backward, whereby the thickness of the arc reflecting member 32 can be reduced, and another component having a certain volume is arranged on the back side of the arc reflecting member 33. Explained that it would be possible. In the first embodiment, the case where the “other constituent element” is the lock mechanism has been described. In the present embodiment, a case where “other components” are a trigger coil 55, a light receiving sensor 56, and a connector 57 as electrical components mounted on the mounting substrate 39 will be described. However, in the first embodiment, it has been described that the retracting portion 33f is provided on the back surface side of the portion of the arc reflecting member 33 close to the light source 1 in order to arrange the lock mechanism. On the other hand, in the present embodiment, the arrangement of the trigger coil 55, the light receiving sensor 56, and the connector 57 on the back surface side of the portion of the arc reflecting member 33 far from the light source 1 will be described.

  As described in the first embodiment, the arc reflection surface 33d is positioned in the light emission direction L (the height toward the light emission direction L increases as the distance from the light source 1 in the circumferential direction increases). It is formed as a surface inclined with respect to the reference plane along. For this reason, the back surface (hereinafter also referred to simply as the back surface of the arc reflecting member 33) 33k of the arc reflecting surface 33d of the arc reflecting member 33 is also formed on the same inclined surface and is separated from the light source 1 in the circumferential direction CC. The further away from the mounting substrate 39 is, the closer it is. Further, since the arc reflecting surface 33d is a spiral surface without twisting, the arc reflecting surface 33d is formed between the mounting substrate 39 and the back surface 33k of the arc reflecting member 33 as compared with the case where the arc reflecting surface 33d is formed as a twisting spiral surface as in Reference Example 2. The distance (height) can be increased. In addition, since the reflector 32 is tilted backward to reduce the thickness of the arc reflecting member 32, the height between the mounting board 39 and the back surface 33k of the arc reflecting member 33 is not tilted backward. It can be made larger than when the thickness of the arc reflecting member is not thin.

  For this reason, the mounting substrate is mounted on the back surface of the arc reflecting surface, which is a space between the back surface 33k of the arc reflecting member 33 having a large height and the mounting substrate 39 (a space facing the back surface of the arc reflecting member 33 in the thickness direction). Among the electrical components on 39, those having a large height can be arranged. That is, at least one of the trigger coil 55, the light receiving sensor 56, and the connector 57 having a large height among the electrical components can be arranged. Accordingly, the trigger coil 55, the light receiving sensor 56, and the connector 57 can be arranged so as to be shifted in the radial direction R with respect to the arc reflecting member 33, and the illuminating device can be prevented from being enlarged in the radial direction R. Further, even if the lighting device is thin, a sufficient space for mounting the trigger coil 55, the light receiving sensor 56, and the connector 57 can be secured as the space behind the arc reflecting surface, so that the thin shape of the lighting device is maintained. be able to.

  That is, according to the present embodiment, large electrical components such as the trigger coil 55, the light receiving sensor 56, and the connector 57 can be efficiently arranged in the space on the back surface side of the arc reflecting member 33, so that the lighting device is sufficiently small. Can be realized.

  By the way, since the trigger coil 55 generates noise when energized, if the trigger coil 55 and the light receiving sensor 56 are arranged close to each other, the light receiving sensor 56 is easily affected by the noise. For this reason, in this embodiment, the light source 1 is sandwiched between two arc reflecting surface back spaces formed between the back surface of the two arc reflecting surfaces 33d of each arc reflecting member 33 and the mounting substrate 39, that is, in the radial direction R. It effectively uses the space behind the two arc reflecting surfaces that can be formed on opposite sides. That is, the trigger coil 55 is disposed in one of the two arc-reflecting surface back spaces, and the light receiving sensor 56 is disposed on the other, so that the distance between the trigger coil 55 and the light receiving sensor 56 in the radial direction R is as large as possible. To do.

  In FIG. 32, the trigger coil 55 and the connector 57 are arranged in the space behind the arc reflecting surface above the light source 1 in the drawing, and the light receiving sensor 56 is arranged in the space behind the arc reflecting surface below the light source 1. .

  In FIG. 33 showing the modification, the light receiving sensor 56 and the connector 57 are arranged in the space behind the arc reflecting surface above the light source 1 in the drawing, and the trigger coil is placed in the space behind the arc reflecting surface below the light source 1. 55 is arranged.

  32 and 33, the arc reflecting member 33 (arc reflecting surface 33d) exists between the light receiving sensor 56 and the light source 1 whose light emission should be monitored. For this reason, in this embodiment, as shown in FIG. 34 (sectional view taken along line BV-BV in FIG. 33), a portion of the arc reflecting member 33 where the arc reflecting surface 33d is formed (the arc reflecting surface 33d). And a back surface 33k), a through hole 33h is formed. The through-hole 33h opens at the arc reflecting surface 33d and the back surface 33k. Then, the light receiving sensor 56 is mounted on the mounting substrate 39 after the direction of the light receiving sensor 56 is determined so that the light from the light source 1 reaches the light receiving portion (photodiode) 56a of the light receiving sensor 56 through the through hole 33h. The arrow with W in the figure indicates that the line connecting the light receiving portion 56a and the through hole 33h faces the light source 1 through the light exit opening of the reflector 32. According to this configuration, even when the light receiving sensor 56 is arranged in the space behind the arc reflecting surface, the light emission amount of the light source 1 by the light receiving sensor 56 can be monitored satisfactorily.

  FIG. 35 shows a modification of the configuration of FIG. In this modification, the light receiving sensor 56 is not mounted on the mounting substrate 39, and the light receiving portion 56 a is separated from the main body portion and connected to the main body portion via a cable 58 that passes through the connecting cable 112. The light receiving portion 56a is press-fitted and held together with a filter 56c for dimming light from the light source 1 into the cylindrical shield member 56b. The light receiving sensor 80 in which the light receiving portion 56a and the filter 56c are incorporated into the cylindrical shield member 56b is press-fitted into the through hole 33h formed in the arc reflecting member 33 and is held by adhesion. According to this configuration, it is possible to shorten the distance between the light receiving unit 56a and the light source 1 compared to the configuration illustrated in FIG. In addition, since the light receiving sensor 80 is held in the through hole 33h of the arc reflecting member 33, the emission amount monitor may become unstable due to the positional deviation between the through hole 33h and the light receiving sensor 80 as shown in FIG. Absent. Therefore, a better monitoring of the light emission amount of the light source 1 is possible.

  Further, FIG. 36 shows another modification. In this modification, a light receiving sensor 56 (including a light receiving portion) is mounted on the mounting substrate 39, and light from the light source 1 is received through an optical fiber 59 inserted into a hole formed in the semi-cylindrical portion 32c of the reflector 32. Guide to sensor 56. The optical fiber 59 is held by an elastic holding member 61 for fixing the light source 1 to the reflector 2 and a holding portion 33 m formed on the outer surface of the outer peripheral wall portion of the arc reflecting member 33. The optical fiber 59 may be inserted from the side surface of the reflector 32 (one surface in the longitudinal direction of the light source 1). According to this configuration, since it is not necessary to form the through hole 33h in the arc reflecting member 33 as in the configuration shown in FIGS. 34 and 35, it is possible to avoid slight unevenness of the illumination light due to the through hole 33h. Can do.

  FIG. 37 shows a configuration for reducing the influence of noise generated from the trigger coil 55 as compared with the configurations shown in FIGS. 32 and 33. The left figure of FIG. 37 has shown the cross section along the BX-BX line | wire in the center figure. Reference numeral 33 g denotes a wall portion that is integrally formed with the arc reflecting member 33 and covers the periphery of the trigger coil 55 on the mounting substrate 39. Covering the trigger coil 55 with the wall 33g increases the extension surface distance of the trigger coil 55, and the noise generated from the trigger coil 55 affects the light receiving sensor 56 as compared to the configuration shown in FIGS. This can be avoided more reliably.

  In the first to third embodiments, the configuration based on the lighting device of the reference example 2 has been described. However, the configuration described in the first to third embodiments may be applied to the lighting device described in the first reference example.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

  A photographing illumination device capable of uniform illumination at low cost can be provided.

DESCRIPTION OF SYMBOLS 1 Light source 32 Reflecting umbrella 33 Arc reflecting member 55 Trigger coil 56 Light receiving sensor 57 Connector 131 Illuminating device 201 Shooting lens

Claims (12)

An illumination device that can be arranged so as to surround the outer periphery of the taking lens,
In a state in which the illumination device is supported so as to surround the outer periphery of the photographing lens, a direction corresponding to the radial direction of the photographing lens is a radial direction of the illumination device, and a direction surrounding the outer periphery of the photographing lens is the illumination device And the direction toward the object scene photographed through the photographing lens as the light irradiation direction of the illumination device, and the direction along the optical axis of the photographing lens as the thickness direction of the illumination device,
A light source;
A first reflecting portion that is provided so as to extend in the circumferential direction inside the radial direction from the light source , and that reflects light from the light source in the light irradiation direction, and light from the light source to the first light source. among the circumferential direction of the reflecting portion and a reflective member having a second reflecting part for reflecting a region extending away from said light source,
The first reflecting portion includes a first region and a second region disposed on both sides of the first region in the circumferential direction,
The second reflecting portion includes a first surface that reflects a part of light from the light source to the second region disposed on one of the both sides, and the second surface disposed on the other of the both sides. A second surface that reflects a portion of the light from the light source to the region of
The first reflecting portion of the reflecting member and the back surface of the first reflecting portion are formed so as to be positioned in the light irradiation direction as the distance from the light source in the circumferential direction increases.
A trigger coil for causing the light source to start light emission, a light receiving sensor for detecting the light emission amount of the light source, and a cable connected to the lighting device are connected to a space facing the back side of the reflecting member in the thickness direction. A lighting device, wherein at least one of the connectors is arranged. It has a condensing member that directs the light diverging from the light source to the inside in the radial direction from the light source using a reflective surface,
The condensing member has the two reflection surfaces on the light irradiation direction side and the opposite side from the light source in the thickness direction, and has a light exit opening between the two reflection surfaces,
In the cross-section along the thickness direction, the light collecting member has a center direction of an emission range of light emitted from the light emission opening toward the inner side of the radial direction, and the light irradiation direction side. The lighting device according to claim 1, wherein the lighting device is arranged to be inclined to the opposite side. It has a condensing member that directs the light diverging from the light source to the inside in the radial direction from the light source using a reflective surface,
The condensing member has two reflecting surfaces on the light irradiation direction side and the opposite side from the light source in the thickness direction, and the two reflecting surfaces are symmetrical with respect to a symmetry plane passing through the light source. Has a shape along two surfaces,
2. The illumination according to claim 1, wherein the condensing member is arranged such that the symmetry plane is inclined inward in the radial direction and opposite to the light irradiation direction. apparatus. Said first region, the illumination device according to any one of claims 1 to 3, characterized in that it has a less than 45 ° angle of inclination relative to the radial direction.   5. The illumination device according to claim 1, wherein the light source is a straight tube type or a linear type light source whose longitudinal direction is a tangential direction with respect to the circumferential direction. 6. The reflecting member has two first reflecting portions on both sides of the light source in the circumferential direction,
The trigger coil is disposed in the space on one side of the two first reflecting portions of the reflecting member, and the light receiving sensor is disposed in the space on the other side. The illumination device according to any one of 1 to 5.   The lighting device according to claim 1, wherein a hole through which light from the light source passes toward a light receiving portion of the light receiving sensor is formed in the reflecting member.   The illumination device according to claim 1, wherein a hole for holding a light receiving portion of the light receiving sensor is formed in the reflecting member.   The illumination device according to claim 1, wherein light from the light source is guided to the light receiving sensor by an optical fiber. The trigger coil is disposed in the space;
The lighting device according to claim 1, wherein the reflecting member is provided with a wall portion that covers the trigger coil.   11. The photographic lens can be attached and detached, and is disposed so as to surround the outer periphery of the photographic lens by being attached to the photographic lens. The lighting device according to item. A first reflecting portion formed in an arc shape;
A light source disposed outside the first reflecting portion in the radial direction of the first reflecting portion;
A second reflector that reflects light from the light source in a circumferential direction of the first reflector and away from the light source;
An emission part for emitting the light reflected by the first reflection part,
The first reflecting portion includes a first region and a second region disposed on both sides of the first region in the circumferential direction,
The second reflecting portion includes a first surface that reflects a part of light from the light source to the second region disposed on one of the both sides, and the second surface disposed on the other of the both sides. A second surface that reflects a portion of the light from the light source to the region of
The first reflecting unit reflects light from the light source and light from the second reflecting unit in the direction of the emitting unit, and is positioned closer to the emitting unit as the distance from the light source in the circumferential direction increases. Is formed as
In order to detect a light emission amount of the light source, a trigger coil for causing the light source to start light emission in a space facing a surface of the first reflecting portion opposite to the emission portion side in the thickness direction. At least one of the light receiving sensor and the connector to which the cable connected to the lighting device is connected is disposed.