JP6674277B2 - Lighting adapter - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside.

  2. Description of the Related Art Conventionally, in an imaging apparatus having an imaging function, for example, when performing an imaging operation in a low-luminance environment such as at night or in the shade, irradiation light is directed toward an external subject in order to obtain a sufficient exposure amount. In which a light-emitting unit for this purpose is incorporated in the apparatus body as a unit has been put to practical use.

  A light emitting unit provided in this type of conventional image pickup device includes a flash light emitting device using, for example, a flash discharge tube as a light source, and a light emitting diode (Light Emitting Diode; LED) as another light source. Has been put to practical use.

  When an imaging operation using the light emitting unit is performed using the conventional imaging apparatus having such a configuration, particularly when an object to be imaged is in an extremely close area (for example, when the distance to the object is about several centimeters, During so-called close-up imaging (when the object is at a distance), the illumination light emitted from the light emitting unit may not be appropriately applied to a desired subject. Specifically, for example, a structure such as a lens barrel provided on the front side (subject side) of the imaging apparatus blocks illumination light from the light emitting unit, and the like. It may not be possible to irradiate the illumination light uniformly. In such a case, the obtained image is partially in a state of insufficient light quantity.

  Therefore, in recent years, by attaching to an imaging device having a light emitting unit, the illumination light emitted from the light emitting unit of the imaging device to the outside is guided to the vicinity of the periphery of the imaging optical system to obtain diffuse illumination light. Japanese Patent Application Laid-Open Nos. 2005-258011, 2009-137298, and JP-A-2009-237298 disclose an illumination adapter that is an accessory device that enables uniform illumination light to be obtained for a subject even during imaging. Various proposals have been made.

  The lighting adapters disclosed in the above-mentioned Japanese Patent Application Laid-Open Nos. 2005-258011 and 2014-142564 are illumination adapters to be attached to an imaging device having a light emitting unit using a light emitting diode as a light source.

  The lighting adapter disclosed in the above-mentioned Japanese Unexamined Patent Application Publication No. 2009-237298 is a lighting adapter that is used by being attached to an imaging device having a flash light emitting device using a flash discharge tube as a light source of a light emitting unit.

JP 2005-258011 A JP 2014-142564 A JP 2009-237298 A

  However, the lighting adapters disclosed in JP-A-2005-258011, JP-A-2014-142564, and the like have a configuration in which a light emitting diode is used as a light source, as described above. Since a light emitting diode as a light source can obtain a smaller amount of light than, for example, a light source using a flash discharge tube as a light source, there is a possibility that a sufficient amount of illumination light cannot be obtained. If the amount of illumination light is small, for example, the shutter speed must be reduced in order to obtain an appropriate exposure amount for imaging, and this causes camera shake, subject shake, and the like. There is a problem.

  Further, the illumination adapter disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2009-237298 or the like has a configuration using a flash discharge tube as a light source, so that a sufficient amount of light can be obtained. However, when the illumination light from the light emitting unit of the imaging device is guided to the vicinity of the periphery of the imaging optical system to obtain the diffusion illumination light, a part of the diffusion illumination light is, for example, in the imaging optical system of the imaging device. Direct incidence may occur. In this case, intense light that has directly entered the imaging optical system becomes harmful light when forming an image including the subject, and causes flare and the like due to the harmful light, which is a factor of deteriorating the image quality of the acquired image. There is a problem.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a lighting adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside. In a structure that converts irradiated illumination light into diffused illumination light and guides the diffused illumination light to the vicinity of the imaging optical system, the diffused illumination light is prevented from directly entering the imaging optical system. An object of the present invention is to provide an illumination adapter that can irradiate an appropriate amount of illumination light uniformly to a close subject while suppressing the occurrence of flare and thereby suppressing the deterioration of the quality of an acquired image.

In order to achieve the above object, an illumination adapter according to one embodiment of the present invention is a lighting adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside, wherein illumination light from the light emitting unit is provided. A light introduction opening to be introduced, a reflection surface that reflects illumination light introduced from the light introduction opening toward the imaging optical axis of the imaging device, and a diffusion unit that diffuses the illumination light reflected by the reflection surface. A light guide means having an opening for exposing an imaging aperture of the imaging device; and an aperture provided around the aperture and reflecting the diffused illumination light guided from the light guide means to the subject side. A reflecting portion having a tapered reflecting surface formed so as to expand toward the light source ; the diffusing portion is disposed on a part of the tapered reflecting surface ; and the opening and the diffusing portion are further provided. On the subject side And and a reflecting body having a wall portion formed in the building so.

A lighting adapter according to another embodiment of the present invention is a lighting adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside, wherein a light introduction opening for introducing illumination light from the light emitting unit is provided. guide has a anti-reflecting surface for reflecting the illumination light introduced from the light introduction opening toward the imaging optical axis of the imaging device, a diffusion unit for diffusing the illumination light thus reflected in the reflected reflecting surface light Means, an opening for exposing an imaging opening of the imaging device, and a diffuse illumination light provided around the opening and reflected from the light guide means, reflected from the opening toward the object side to reflect the object toward the object side. a reflecting portion having a formed tapered reflective surface so as to extend, and a notch formed by cutting a part of the upper Symbol tapered reflecting surface for disposing the diffusing portion, the opening and the notch At the border with A rib-like wall portions which are, equipped with a reflecting body having a.

  According to the present invention, in a lighting adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside, the illumination light emitted from the light emitting unit is converted into diffused illumination light, In a structure that guides light to the vicinity of the imaging optical system, the diffuse illumination light is suppressed from directly entering the imaging optical system to suppress the occurrence of flare. An illumination adapter capable of uniformly irradiating an appropriate amount of illumination light toward a close subject can be provided.

1 is an external perspective view illustrating a lighting adapter according to an embodiment of the present invention and an imaging device to which the lighting adapter can be attached and used. FIG. 1 is an external perspective view illustrating a mounted state of a lighting adapter and an imaging device according to an embodiment of the present invention. Front view of the mounted state of the illumination adapter and the imaging device according to one embodiment of the present invention FIG. 3 is a sectional view taken along the line [4]-[4] in FIG. FIG. 3 is a sectional view taken along the line [5]-[5] in FIG. FIG. 1 is an exploded perspective view showing an exploded lighting adapter according to an embodiment of the present invention. FIG. 6 is a plan view of the lighting adapter of FIG. 6 when viewed from the back side. The top view which looked at the state which removed some components (mount member) from the lighting adapter of FIG. 6 from the back side. The perspective view from the back side in the lighting adapter of the state of FIG.

  Hereinafter, the present invention will be described with reference to the illustrated embodiments. Each drawing used in the following description is schematically shown, and in order to show each component in a size recognizable in the drawing, the dimensional relationship and scale of each member are different for each component. In some cases. Therefore, the present invention is limited to the illustrated form only with respect to the number of components, the shape of the components, the ratio of the sizes of the components, the relative positional relationship between the components, and the like described in each of the drawings. Not something.

  In one embodiment of the present invention, an optical image formed by an imaging optical system is converted into a photoelectric conversion element (for example, a charge coupled device (CCD) image sensor or a complementary metal oxide film (CMOS)). (Semiconductor) type image sensor or the like) (hereinafter, referred to as an image sensor), and sequentially converts the obtained image signal into image data of a predetermined form (for example, digital image data representing a still image or a moving image). An image display device (e.g., a liquid crystal display (LCD) or an organic electroluminescence (organic electroluminescence) device) that reproduces and displays a still image or a moving image based on the digital image data recorded on the storage medium while recording on the storage medium. EL; Organic Electro-Luminescence (OEL) display etc.) The body, illustrates the illumination adapter attached to the structure built together (so-called digital camera) imaging apparatus emitting portion for irradiating illumination light to the outside.

  In the present embodiment, the imaging optical axis of the imaging optical system is represented by reference symbol O. Here, as an imaging optical system of the imaging apparatus exemplified in the present embodiment, for example, a prism or the like is provided in an optical path from the subject side to the imaging element, and the prism or the like is used to realize the imaging optical system. A bending optical system configured by bending an optical path (optical axis) at an angle of 90 degrees is employed. Therefore, the optical axis of the imaging optical system includes an optical axis in a direction along an optical path incident from the subject side and an optical axis in a direction along an optical path toward the image sensor after being bent by the prism. In the description of the above, the imaging optical axis indicated by the reference sign O indicates the former, that is, the optical axis along the incident optical path from the subject side.

  In the imaging device according to the present embodiment, the surface facing the subject when the imaging device is used in the direction along the imaging optical axis O (hereinafter, simply referred to as the optical axis O) is referred to as the front surface of the imaging device. Similarly, in the direction along the optical axis O, the surface facing the user when using the imaging device is referred to as the back surface of the imaging device. Further, a surface of the operation member of the imaging device on which the shutter release button is provided is referred to as an upper surface of the imaging device. The surface facing the top surface of the imaging device is referred to as the bottom surface of the imaging device. Furthermore, the surfaces arranged on both sides of the imaging device in a normal use state are referred to as a left side surface and a right side surface. In this case, left and right when viewed from the subject side toward the front of the imaging device are distinguished as left and right, respectively.

  FIGS. 1, 2 and 3 are external views showing a lighting adapter according to an embodiment of the present invention and an imaging device to which the adapter can be attached and used. 1 is an external perspective view showing a state in which the illumination adapter of the present embodiment is removed from the imaging apparatus. 2 and 3 show a state in which the illumination adapter according to the present embodiment is mounted on the imaging device. FIG. 2 is a perspective view. FIG. 3 is a front view of the imaging apparatus as viewed from the front side.

  4 and 5 are cross-sectional views of a state (a state shown in FIGS. 2 and 3) in which the illumination adapter of the present embodiment is mounted on the imaging device. FIG. 4 shows a cross section along line [4]-[4] in FIG. FIG. 5 shows a cross section taken along line [5]-[5] in FIG.

  6 to 9 are views showing the lighting adapter of the present embodiment. FIG. 6 is an exploded perspective view showing the lighting adapter of the present embodiment in an exploded manner. FIG. 7 is a plan view when the lighting adapter of the present embodiment is viewed from the back side. FIG. 8 is a plan view when a part (mounting member) of the components of the lighting adapter of the present embodiment is removed and viewed from the back side. FIG. 9 is a rear perspective view of FIG.

  First, a schematic configuration of a lighting adapter according to an embodiment of the present invention and an imaging device to which the lighting adapter can be attached and used will be described below mainly with reference to FIGS.

  The illumination adapter 10 of the present embodiment is used by being attached to the imaging device 1 having the light emitting unit 5 for irradiating illumination light to the outside.

  As shown in FIG. 1, the imaging device 1 to which the illumination adapter 10 of the present embodiment is attached is configured by housing various components in a housing 2 having a substantially rectangular box shape as a whole. On the front surface of the housing 2, an imaging opening 4b is formed substantially at the center. The imaging aperture 4b is an aperture for introducing a light beam contributing to imaging into the interior. For this purpose, the optical axis O of the imaging optical system 41 (not shown in FIGS. 1 to 3; see FIG. 4) disposed inside the housing 2 passes through substantially the center of the imaging opening 4b. In addition, the relative position of the imaging aperture 4b with respect to the imaging optical system 41 is defined.

  The imaging opening 4b is provided with a protective window member 4 made of a transparent member made of a thin plate-like glass or acrylic resin. The protective window member 4 has a function of transmitting an imaging light beam to the imaging optical system 41 and a function of protecting components such as the internal imaging optical system 41.

  On the front surface of the imaging device 1, on the outer peripheral edge of the imaging opening 4b, an accessory mounting mount for mounting various accessory devices, such as the illumination adapter 10 of the present embodiment, to the imaging device 1. A portion 4a is provided (see FIG. 1; not shown in FIGS. 2 and 3). As a form of the accessory mounting mount 4a, for example, a bayonet type or a screw type mounting type is applied. In the present embodiment, a bayonet type mounting method is shown as an example (see FIG. 1).

  In the imaging device 1, a light emitting unit 5 is provided near one corner near the upper right surface. The light emitting section 5 includes, for example, a so-called flash light emitting device configured to include a flash discharge tube 51, an illumination light reflecting shade 52 (reflecting umbrella), a substantially rectangular illumination light irradiation window 53, and the like (see FIG. 4 and the like). It is of the form called.

  On the front surface of the imaging device 1, an illumination light irradiation window 53 of the light emitting unit 5 is disposed so as to be substantially flush with the outer surface. The illumination light irradiation window 53 is made of a substantially transparent resin member or the like so as to allow the illumination light to pass therethrough. The inner surface of the illumination light irradiation window 53 diffuses the illumination light generated by the flash discharge tube 51 into a predetermined irradiation range. A predetermined surface treatment is performed so as to obtain. An illumination light reflection shade 52 (reflection umbrella) is provided inside the illumination light irradiation window 53, and a flash discharge tube 51 is disposed at a substantially central portion thereof. The illumination light reflection shade 52 is formed so as to irradiate illumination light generated by the flash discharge tube 51 in one predetermined direction (that is, in the direction of the illumination light irradiation window 53 on the front side). The configuration of such a flash light emitting device itself is the same as that generally used in the past, and therefore, further detailed description will be omitted. The flash light emitting device includes a cylindrical discharge tube and a rectangular reflector having a pair of reflecting surfaces for reflecting the flash emitted from the discharge tube toward the subject.

  On the other hand, a plurality of operation members 3 are arranged on the upper surface of the imaging device 1. Examples of the plurality of operation members 3 include a power button for performing a power on / off operation, a release button for performing a shutter release operation, and a zoom lever for performing a zooming operation.

  On the other hand, on the front side of the imaging device 1, a grip portion 6 is disposed at a position on the left side so as to cover the left side surface from the front left side region. Further, on the left side surface of the imaging device 1, a strap attaching portion 7 for attaching a hanging string or the like is provided. Other configurations of the imaging device 1 are the same as those of the related art.

  The illumination adapter 10 of the present embodiment attached to the imaging device 1 having such a configuration is connected to the accessory mounting mount 4a of the imaging device 1 by bayonet coupling. To this end, a bayonet claw 21d (not shown in FIG. 1 or the like; see FIG. 7) corresponding to the accessory mounting mount 4a of the imaging device 1 is provided on the back side of the illumination adapter 10.

  The illumination adapter 10 of the present embodiment introduces the illumination light from the light emitting unit 5, reflects the illumination light toward the imaging optical axis O of the imaging device 1, and diffuses and reflects the reflected light. A light guiding means for converting the light into illumination light; and reflecting the diffused illumination light guided from the light guide means toward an object side (forward), and shielding the diffused illumination light from entering the imaging optical system. And the reflecting main body 12 which is formed.

  For this purpose, as will be described in detail later, the light guide means 11 includes a reflecting member 32 (not shown in FIG. 1; see FIG. 6 and the like) for reflecting the illumination light and a diffused illumination light by diffusing the reflected light. And a diffusion plate 33 serving as a diffusion member. In addition, the reflection main body 12 shields the opening 10 a that exposes the imaging opening 4 b, the tapered reflection surface 35 that reflects the diffused illumination light toward the subject side (forward), and the diffused illumination light to the imaging optical system 41. It has a wall 21c and the like.

  In a state where the illumination adapter 10 of the present embodiment is attached to the imaging device 1, the light guide unit 11 is disposed so as to cover the light emitting unit 5 of the imaging device 1, and the reflection main body 12 is used for imaging of the imaging device 1. It is in a state of being attached around the opening 4b. The mounted state is the state shown in FIGS.

  Next, a detailed configuration of the illumination adapter 10 of the present embodiment will be described below mainly with reference to FIGS. 4 to 9 (particularly, particularly, FIG. 6).

  As described above, the illumination adapter 10 of the present embodiment is mainly configured by the light guide means 11 and the reflection main body 12.

  The light guide means 11 has a substantially triangular shape when viewed from the front side (see FIG. 3), and has a housing portion having a thickness in the front-rear direction when attached to the imaging device 1 and having a space inside the main part. It is formed as a member.

  The reflection main body 12 has an opening 10a at a substantially central portion, is formed in an annular shape as a whole, and has a tapered reflection surface 35 having a shape in which the diameter increases from the periphery of the opening 10a toward the subject. Is configured.

  The whole of the illumination adapter 10 of the present embodiment is configured by combining a plurality of constituent members so that the light guide means 11 and the reflection main body 12 are integrated. Hereinafter, the configuration will be specifically described.

  That is, the basic part of the illumination adapter 10 is constituted by a plurality of constituent members including the mount member 21, the main body member 22, and the annular reflecting member 23. The light guide means 11 is mainly constituted by a part of the mount member 21 and a part of the main body member 22. The reflection main body 12 is mainly constituted by a part of the mount member 21, a part of the main body member 22, and an annular reflection member 23.

  The mount member 21 has a light introduction opening 21b which is a part of the light guide means 11, has an opening 21a (equivalent to the opening 10a) which is a part of the reflection main body 12, and a wall 21c, and has a rear surface. It has a bayonet claw 21d (see FIG. 7) for ensuring connection with the imaging device 1 on the side.

  The main body member 22 is configured by a housing part forming a part of the light guide unit 11 and an annular part forming a part of the reflection main body 12. The housing portion includes a reflection member 32, a diffusion plate 33 (diffusion portion), and the like inside, and allows the illumination light guided from the light guide means 11 to the reflection main body 12 to pass therethrough and fixedly supports the diffusion plate 33. This is a structural portion configured to have an opening 22b. In addition, the annular portion has an opening 22a (equivalent to the opening 10a) in a substantially central portion, and the housing portion (light guide means 11) is integrally held in a part of an outer peripheral edge portion. It is.

  The annular reflecting member 23 is configured to have an opening 23a (equivalent to the opening 10a) and a tapered reflecting surface 35 for reflecting the diffused illumination light guided from the light guiding means 11 toward the subject. Reflective part. As will be described in detail later, the diffusion plate 33 of the light guide 11 is disposed on a part of the reflection surface 35 of the annular reflection member 23 so as to be exposed. Around the opening 23a of the annular reflecting member 23, a wall 21c of the mounting member 21 is disposed so as to extend toward the subject (front).

  The mount member 21 and the main body member 22 are integrated by, for example, being fastened and fixed by a plurality of screws 36. Further, the main body member 22 and the annular reflection member 23 are connected so as to be integrated by using a mechanical joining means such as a snap fit.

  Each part will be described in detail. As described above, the housing, which is a main component of the light guide unit 11, includes a part of the mount member 21 and a part of the main body member 22. Among them, a substantially rectangular light introduction opening 21b for introducing illumination light from the light emitting unit 5 is provided in the housing of the light guide means 11. Here, the light introduction opening 21b is formed in the mount member 21.

  Therefore, when the illumination adapter 10 is attached to the imaging device 1, the light guide unit 11 is arranged on the front surface of the imaging device 1 so as to cover the light emitting unit 5. In this case, the light introduction opening 21b is arranged so as to face the illumination light irradiation window 53. Thus, the illumination light is emitted from the illumination light irradiation window 53 so that the irradiation direction (that is, the direction toward the front surface and substantially parallel to the optical axis O) is substantially aligned with the light introduction opening 21b. Therefore, the illuminating light emitted from the illuminating light irradiation window 53 of the light emitting section 5 is introduced into the light guiding means 11 from the light introducing opening 21b.

  The light introducing opening 21b is provided with a protective plate 24 made of a transparent or translucent member made of a thin flat glass or acrylic resin or the like. The protection plate 24 is a member having a function of protecting the internal components of the light guide unit 11. The protection plate 24 is fixed to the peripheral portion of the light introduction opening 21b of the mount member 21 using, for example, a sticking member such as a double-sided tape 25 or the like.

  On the other hand, a reflection member 32 (reflection surface) including a plurality of reflection plates (32a, 32b, 32c) is provided inside the housing of the light guide unit 11. The reflection member 32 is provided in the main body member 22. That is, inside the casing of the light guiding means 11, a thin plate surface on which a wall surface facing the light introduction opening 21b and a top surface side wall surface are subjected to a surface processing treatment (for example, mirror finish) capable of reflecting light. A reflection member 32 made of a resin member or the like is provided.

  The reflection member 32 is a member that reflects the illumination light introduced from the light introduction opening 21 b toward the imaging optical axis O of the imaging device 1. For this purpose, the reflection member 32 is constituted by a plurality of reflection plates (three in this embodiment; 32a, 32b, 32c; see FIGS. 6, 8 and 9). Needless to say, instead of using the reflecting member 32 as a plurality of reflecting plates, the inner wall surface of the housing of the light guide unit 11 where the reflecting member 32 is disposed may be, for example, silver-plated. And the like.

  Specifically, a first reflecting plate 32a (see FIG. 5) provided with a reflecting surface facing the lower surface side on the upper surface side wall surface in the housing portion of the light guide means 11, and a light introducing opening 21b in the housing portion. There is a second reflection plate 32b and a third reflection plate 32c provided on the wall surface facing the surface along. Here, the second reflection plate 32b has a reflection surface disposed at a predetermined inclination with respect to the light introduction opening 21b on a part of a wall surface facing a surface along the light introduction opening 21b. (See FIGS. 4 and 9). In this case, the second reflection plate 32b is disposed so that the reflection surface has a predetermined inclination toward the side where the imaging optical axis O of the imaging device 1 exists (see FIGS. 4 and 9). . Further, the third reflection plate 32c is disposed on a part of a wall surface facing a surface along the light introduction opening 21b so as to face the light introduction opening 21b (see FIG. 5).

  On the other hand, the housing of the light guide means 11 has a rectangular opening 22b for passing the illumination light reflected by the reflection member 32 toward the side having the optical axis O and for fixing and supporting the diffusion plate 33. Is provided.

  Further, the housing of the light guide 11 has a diffusion plate 33 which is a diffusion member for diffusing the illumination light reflected by the reflection member 32. The diffusing plate 33 is a diffusing member for diffusing the reflected light by transmitting the reflected light (illumination light) from the reflecting member 32.

  The diffusion plate 33 is a plate-like member formed of a translucent member of milky white or the like made of, for example, a thin plate made of glass or acrylic resin. The diffusion plate 33 is fixed to the main body member 22 so as to cover the opening 22b. In this case, for fixing the diffusion plate 33, for example, an adhesive member such as a double-sided tape 34 or the like is used.

  Further, the housing of the light guide means 11 has a light shielding member 26 which can be switched between a fully opened state in which the light introduction opening 21b is optically opened and a semi-light-shielded state in which the light introduction opening 21b is partially shielded. doing. The light blocking member 26 is provided near the light introduction opening 21b.

  The light-shielding member 26 is formed, for example, in the shape of a thin plate and slightly elongated in a substantially rectangular shape, and is rotatably supported on the main body member 22 so that the light-shielding member 26 is rotatable within a predetermined range with one end as a support shaft. For this purpose, a support hole 26a is formed at one end of the light shielding member 26. The support shaft of the opening state switching operation member 28 is inserted through the support hole 26a with the main body member 22 interposed therebetween. In other words, the support shaft of the opening state switching operation member 28 is fitted into the support hole 26a of the light shielding member 26 after passing through the through hole 22c of the main body member 22. The light-shielding member 26 and the opening state switching operation member 28 are integrated with the body member 22 by screws 29 and are rotatably disposed around the support shaft of the opening state switching operation member 28.

  The opening state switching operation member 28 is a dial-type or lever-type operation member capable of rotating or swinging the light-shielding member 26 within a predetermined range by rotating or swinging about a support shaft within a predetermined range. is there. Therefore, the opening state switching operation member 28 is rotated or swung with respect to the light guide unit 11 of the lighting adapter 10 such that a part thereof is exposed from the outer surface of the housing portion of the light guide unit 11. It is arranged freely.

  With this configuration, when the user manually rotates or swings the opening state switching operation member 28, the light blocking member 26 rotates within a predetermined range. Specifically, when the user manually turns or swings the opening state switching operation member 28 in one direction, the light shielding member 26 is turned on by the illumination light introduced from the light introduction opening 21b. 7A to 9C to a fully retracted state in which the light introduction opening 21b is optically opened (a position shown by a two-dot chain line in FIGS. 7 to 9). On the other hand, in the fully opened state, when the user manually turns or swings the opening state switching operation member 28 in the other direction, the light shielding member 26 shields a part of the light introduction opening 21b. As a result, it is possible to switch to a semi-light-shielding state in which a part of the illumination light introduced from the light introduction opening 21b is shielded (the position shown by the dotted line (dashed line in FIG. 7) and the solid line in FIGS. It is configured.

  With such a configuration, the opening state switching operation member 28 functions as an operation member that switches the light introduction opening 21b between a fully opened state and a semi-light-shielded state.

  The opening state switching operation member 28 and the light shielding member 26 are position-regulated so that the rotation or swing position is maintained at a plurality of predetermined positions (two positions in the present embodiment) within the operation range. It has a switching click mechanism 27 which is a mechanism.

  The switching click mechanism 27 includes a plurality of click protrusions 26b provided near the support hole 26a of the light shielding member 26, and a ball 30 provided on the side of the main body member 22 at a position facing the click protrusion 26b. An urging spring 31 is provided on the main body member 22 to urge the ball 30 toward the click convex portion 26b. In addition, about the structure of this switching click mechanism 27, the click mechanism which is a general well-known technique is applied. Therefore, the detailed illustration and description are omitted.

  As described above, in the illumination adapter 10 of the present embodiment, since the opening state switching operation member 28 and the light shielding member 26 are configured to include the switching click mechanism 27, the opening state switching operation member 28 The light shielding member 26 can be switched between a full open state and a semi-light-shielded state by a manual operation, and each state can be maintained in each state.

  The reflection main body 12 is mainly constituted by an annular reflection member 23. As described above, the annular reflecting member 23 has the opening 23a that forms a part of the opening 10a that exposes the imaging opening 4b of the imaging device 1. Around the opening 23a (the opening 10a), the diffused illumination light guided from the light guide 11 is reflected toward the subject (front), so that the diffused illumination light is directed from the opening 10a toward the subject (front). A tapered reflection surface 35 (reflection portion) formed so as to expand. Here, the annular reflecting member 23 (reflecting portion) is formed such that the normal to the reflecting surface 35 extends in a direction along the imaging optical axis O of the imaging device 1.

  Therefore, the annular reflecting member 23, which is a main component of the reflecting main body 12, is a reflecting portion configured to have the opening 23a and the reflecting surface 35.

  The reflective surface 35 is subjected to a surface treatment (for example, embossing) capable of diffusing the illumination light, and a coloring treatment (for example, painting or printing) such as white or milky white that easily reflects the illumination light. Etc.). Alternatively, the annular reflecting member 23 itself may be formed using a colored resin material such as white.

An opening 23b is formed in a part of the reflection surface 35 at a position corresponding to the opening 22b of the light guide 11 and the diffusion plate 33. The opening 23b has an area enough to expose the diffusion plate 33. The opening 23b is provided in a part of the reflection surface 35 as described above. Here, the reflection surface 35 is formed in a tapered shape expanding in diameter from the opening 23a, and is formed in an annular shape. Therefore, the reflection surface 35 itself is a curved surface in the circumferential direction of the opening 23b . On the other hand, the diffusion plate 33 is formed using a thin plate-shaped member. Therefore, the opening 23a is formed in a notch 23c in which a part of the reflection surface 35 is cut out, for example, as shown in FIG.

The configuration of the opening 2 3b portions fraction diffuser plate 33 is disposed, it is not limited to this embodiment, for example, using a spreading member having the same shaped surface to fit the surface shape of the reflecting surface 35 configured May be. In this case, the notch 23c becomes unnecessary.

  As another form, for example, in the annular reflecting member 23, only a part corresponding to the opening 23a is formed so as to have a form equivalent to a diffusing member (a form having a translucent light diffusing function). At the same time, a configuration is also conceivable in which the other portions are formed so as to have a form (a form having a light diffusion reflection function such as white color) similar to that of the reflection surface 35, and are formed integrally.

  With such a configuration, the reflected illumination light reflected by the reflection member 32 of the light guide unit 11 enters the diffusion plate 33 after passing through the opening 22b and the opening 23b, and is diffused by the diffusion plate 33. After that, the diffused illumination light is applied to a region surrounded by the reflection surface 35. The illumination light guided to the area surrounded by the reflection surface 35 is directly irradiated toward the subject (front) or diffused by the reflection surface 35 and reflected toward the subject (front). Is done.

  Further, in the annular reflecting member 23, the wall 21c of the mounting member 21 is provided at a boundary (between) between the opening 23a (the opening 10a) and the reflecting surface 35 (that is, the peripheral portion of the opening 23a). The projection is provided so as to extend toward the subject side (front).

  Here, in the example shown in the present embodiment, the wall portion 21c is the opening 21a of the mount member 21, the opening 22a of the main body member 22, and the opening 23a of the annular reflecting member 23, that is, the illumination. It is arranged over the entire periphery along the periphery of the opening 10 a of the adapter 10 (a portion at the boundary with the reflection surface 35).

  This wall portion 21c prevents the diffuse illumination light radiated from the diffusion plate 33 of the light guide means 11 to the area surrounded by the reflection surface 35 of the reflection main body 12 from directly entering the imaging optical system 41. It is a component provided for blocking.

Here, the diffuse illumination light emitted from the diffusion plate 33 and applied to a region surrounded by the reflection surface 35 (hereinafter, abbreviated as an inner region of the reflection surface 35) is, for example, an arrow indicated by a chain line in FIG. There are components indicated by 1), (2), (3) and the like. this house,
The arrow (1) indicates a light component that is diffused by the diffusion plate 33 and irradiates the inside area of the reflection surface 35 and then travels to the subject side (forward).
The arrow (2) indicates light that is diffused by the diffusion plate 33 and irradiates the area inside the reflection surface 35, then reflected by the reflection surface 35 facing the diffusion plate 33, and traveling toward the subject side (forward). Indicates the ingredients,
An arrow (3) indicates a light component that is diffused by the diffusion plate 33 and irradiates the inside area of the reflection surface 35, and then travels to the side opposite to the subject side (front).

  In this case, the light component indicated by the arrow (3) may directly enter the imaging optical system 41. When the illumination light directly enters the imaging optical system 41, flare or the like is generated, which becomes harmful light for forming an image including the subject.

  Therefore, in the illumination adapter 10 of the present embodiment, by providing the wall portion 21c on the periphery of the opening 10a, the light component serving as harmful light indicated by the arrow (3) in FIG. As a result, the illumination light is prevented from directly entering the imaging optical system 41.

  In FIG. 4, it is considered that the optical path of the light component indicated by the arrow (3) proceeds along a two-dot chain line indicated by an extension of the arrow (3) in FIG. 4 when the wall portion 21c does not exist. Can be On the other hand, in the illumination adapter 10 of the present embodiment, since the wall 21c is provided on an extension of the arrow (3) in FIG. 4, the light component traveling in the direction indicated by the arrow (3) is The light is reliably blocked by the wall 21c. Thus, in the illumination adapter 10 of the present embodiment, the diffused illumination light from the diffusion plate 33 is directly incident on the inside of the imaging optical system 41 by the wall 21c provided on the periphery of the opening 10a. Harmful light can be suppressed.

  As described above, the wall portion 21c is provided so as to protrude toward the subject side (forward). In this case, the extension height of the wall portion 21c (see reference numeral H shown in FIG. 4) is directly radiated toward the subject side (front) of the diffused illumination light radiated on the inner area of the reflection surface 35. The light component (arrow (1) in FIG. 4) and the light component (arrow (2) in FIG. 4) emitted toward the reflection surface 35 are set so as not to be blocked.

  At the same time, the extension height H of the wall portion 21c is set so as not to obstruct the angle of view (Angle of view; see AoV in FIG. 4) of the imaging optical system 41 in the imaging device 1, that is, The setting is made so as not to generate mechanical vignetting.

  In the illumination adapter 10 of the present embodiment, the wall 21c is provided over the entire periphery of the opening 10a, but the wall 21c is limited to such a configuration. There is no. The wall portion 21c only needs to be able to reliably block a light component of the diffused illumination light emitted from the diffusion plate 33 toward the imaging optical system 41. For this reason, the wall 21c does not necessarily need to be provided over the entire periphery of the opening 10a, but may be provided at least in the vicinity of the diffusion plate 33.

  In other words, in the configuration (see FIG. 6 and the like) in which the notch 23 c in which a part of the reflecting surface 35 of the annular reflecting member 23 is cut out in order to dispose the diffusion plate 33 is formed (see FIG. 6 and the like). At the boundary between the notch 23c and the opening 23a, that is, between the notch 23c and the opening 23a, the wall (21c) is formed in a rib shape along the circumferential direction within the range of the notch 23c. It may be configured to extend to the subject side. In other words, between the notch 23c and the diffusion plate (diffusion portion), the wall (21c) extends in the shape of a rib extending in the circumferential direction to the subject side beyond the range of the notch 23c. A configuration may be adopted. In the case of such a configuration, the wall portion (21c) may be formed integrally with (the notch portion 23c of) the annular reflecting member 23, or may be formed on the mount member 21 side similarly to the above-described embodiment. The form which forms a wall part (21c) may be sufficient.

  The illumination adapter 10 is composed of the light guide means 11 and the reflection main body 12, but in the illumination adapter 10 of the present embodiment, the mount member 21, the main body member 22, and the annular reflection member 23 are combined. Thus, the light guide means 11 and the reflection main body 12 are configured to be integrated.

  However, the configuration of the illumination adapter 10 is not limited to this example. For example, the light guide unit 11 and the reflection main body 12 are formed separately from each other, and are configured to be connected to each other. Is also good. Further, in this case, the portions corresponding to the mount member 21, the main body member 22, and the annular reflection member 23 may be configured as separate members, respectively, or each member (21, 22, 23) may be used. It is good also as a form which unifies the part corresponding to each and is comprised as one member.

  When the thus configured illumination adapter 10 of the present embodiment is attached to the imaging device 1, the illumination light emitted from the light emitting unit 5 of the imaging device 1 is indicated by a dashed line indicated by a symbol S in FIGS. Irradiated within range. This illumination light first exits the flash discharge tube 51 and is directly radiated forward as shown in FIGS. 4 and 5, and after being reflected by the illumination light reflector 52, is radiated forward. . After being transmitted and diffused through the illumination light irradiation window 53, the light is guided from the light introduction opening 21 b of the illumination adapter 10 into the housing of the light guide unit 11.

  The illumination light guided to the inside of the housing of the light guide means 11 is reflected in all directions by the reflection member 32, and the reflected light finally goes to the openings 22 b and 23 b and passes through the diffusion plate 33. After being converted into diffused illumination light, the light is guided to a region inside the reflection surface 35.

  Part of the diffused illumination light applied to the inner area of the reflection surface 35 is directly irradiated toward the subject side (front), and another part is diffused by the reflection surface 35 and reflected toward the subject side (front). Is done. Further, the other part is shielded from light by the wall 21c.

  As described above, according to the embodiment, in the illumination adapter 10 attached to the imaging device 1 having the light emitting unit 5 for irradiating the illumination light to the outside, the periphery of the opening 10a corresponding to the imaging opening 4b. Is provided with a wall 21c for blocking diffused illumination light directly incident on the imaging optical system 41.

  In this case, the extension height H of the wall portion 21c toward the subject side (front) is set so that the angle of view of the imaging optical system 41 is not vignetting, and at the same time, the diffusion height from the diffusion plate 33 to the imaging optical system 41 is reduced. It is set so that the diffused light (harmful light) going on can be reliably blocked. Thus, the wall portion 21c can reliably block the diffuse illumination light from the diffusion plate 33 from directly entering the imaging optical system 41.

  Therefore, even when performing close-up imaging using the illumination adapter 10, the occurrence of flare can be suppressed at all times, so that the image quality of the acquired image is suppressed from deteriorating, and an appropriate amount of illumination light is applied to the close subject. Irradiation can be performed uniformly. Therefore, with the use of the illumination adapter 10 of the present embodiment, a good image can always be obtained even during the close-up imaging operation.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications and applications can be made without departing from the spirit of the invention. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some components are deleted from all the components shown in the one embodiment, if the problem to be solved by the invention can be solved and the effect of the invention can be obtained, this configuration is deleted. The configuration can be extracted as an invention. Further, components of different embodiments may be appropriately combined. The invention is not limited by the specific embodiments thereof except as limited by the appended claims.

  The present invention is not limited to only an imaging device specialized in an imaging function, and other forms of electronic devices having an imaging function, such as a digital camera, a movie camera, a mobile phone, a smartphone, an electronic organizer, an electronic dictionary, It can be widely applied to various electronic devices with an imaging function, such as portable information terminals, personal computers, tablet-type terminal devices, game devices, television receivers, clocks, and navigation devices using GPS (Global Positioning System). it can.

DESCRIPTION OF SYMBOLS 1 ... Image pick-up device 2 ... Case 3 ... Operating member 4 ... Protective window member 4a ... Accessory mounting mount part 4b ... Image pick-up opening 5 ... Light emitting part 6 ... Grip part 7 ... Strap mounting part 10 Lighting adapter 10a Opening 11 Light guide 12 Reflecting body 21 Mounting member 21a Opening 21b Light introducing opening 21c Wall 21d Bayonet claw 22 Body member 22a Opening 22b Opening 22c Through hole 23 Annular reflecting member 23a Opening 23b Opening 23c Notch 24 Protective plate 25 Double-sided tape 26 Light-shielding member 26a Support hole 26b Click protrusion 27 Switch click mechanism 28 Open state switching operation member 29 Screw 30 Ball 32 Reflection member 32a First reflection plate 32b Second Reflector 32c ... Third reflecting plate 33... Diffusing plate 34... Double-sided tape 35... Reflecting surface 36. AoV: angle of view H: wall extension height O: imaging optical axis

Claims (8)

In a lighting adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside,
A light introduction opening for introducing illumination light from the light emitting unit, a reflection surface for reflecting the illumination light introduced from the light introduction opening toward an imaging optical axis of the imaging device, and an illumination reflected by the reflection surface Light guide means having a diffusion unit for diffusing light,
An opening for exposing an imaging opening of the imaging device; and a diffuse illumination light provided around the opening and guided from the light guide means, which is diffused toward the subject from the opening so as to expand toward the subject. A reflecting portion having a formed tapered reflecting surface, wherein the diffusing portion is disposed on a part of the tapered reflecting surface, and the object is provided at a boundary between the opening and the diffusing portion. A reflective body having a wall formed to extend to the side;
A lighting adapter characterized by comprising:   The lighting adapter according to claim 1, wherein the tapered reflecting surface is formed in an annular shape. The walls, the angle of view of the imaging apparatus without eclipsed, and an extending height does not block the irradiation toward the upper Symbol tapered reflective surface of the diffuse illumination light diffused by the diffusion unit It has been that was characterized by that claim 1 or claim 2 Symbol mounting lighting adapter. The reflecting portion, the claim 1 billed to claim 3 any one in serial mounting illumination adapter of which is characterized by having a surface for diffusing light. The diffusion portion, the upper Symbol tapered reflective surface and the claims 1 to illumination adapter according to claim 4 which is characterized by having the same shaped surface. The reflecting portion, either the normal of the tapered counter-reflecting surface is in the above claims 1 to 5 characterized in that it is formed so as to extend in the direction of imaging optical axis of the imaging device The lighting adapter according to one of the above. The opening is formed in a circular shape around an imaging opening of the imaging device,
The reflecting surface of the upper Symbol tapered, the illumination adapter according to any one of the claims 1 to 6 characterized in that it is formed so as the diameter increases from the opening portion. In a lighting adapter attached to an imaging device having a light emitting unit for irradiating illumination light to the outside,
A light introduction opening for introducing the illuminating light from the light emitting unit, and the anti-reflecting surface of the illumination light introduced from the light introduction opening for reflecting the imaging optical axis of the imaging device, thus reflected the reflected reflecting surface Light guide means having a diffusion unit for diffusing the illumination light,
An opening for exposing the imaging opening of the imaging device, and a diffuse illumination light provided around the opening and reflected from the light guide means, reflected from the opening to the subject side so as to spread toward the subject side. border of the reflecting portion, and a notch formed by cutting a part of the upper Symbol tapered reflecting surface for disposing the diffusing portion, and the opening and the notch having the formed tapered reflective surface A reflective body having a rib-shaped wall portion formed to extend toward the subject side;
A lighting adapter characterized by comprising:

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