JP4839095B2 - Ring light - Google Patents

Description

  The present invention relates to a ring light in which LEDs are installed in a circumferential direction, and more particularly, to a ring light used by being connected to a photographing lens.

  Generally, a ring light is used by being connected to a still camera that takes a still image (image) or a film camera (movie camera or video camera) that takes a moving image (video). Of these, the ring light for still cameras is often used as a strobe. In addition, a ring light for a video camera is conventionally relatively large and heavy, and is not suitable for connecting to a mobile camera such as a handy camera that is supposed to be carried by a cameraman. Conventionally, a ring light attached to a camera such as a digital camera is known (see, for example, Patent Document 1).

The ring light described in Patent Document 1 includes a ring-shaped substrate, an electric light source, a power source housed in a battery case, and a switch, and is devised to be small and light. Here, the electrical light source includes a plurality of LED lamp elements (hereinafter simply referred to as LEDs) and wiring thereof, and the plurality of LEDs are attached to the ring-shaped substrate in a row at intervals in the circumferential direction. .
Conventionally, a ring light in which a plurality of LEDs are arranged in a radial direction and arranged radially instead of arranging a plurality of LEDs in a line in the circumferential direction is also known.

In addition, when shooting a moving image instead of a still image, a plurality of LEDs must continue to emit light for a long period of time, and thus heat generated by the light emission of the LEDs must be efficiently released. Therefore, a ring light provided with a heat dissipation mechanism so as to continuously emit light is known.
JP 2003-177454 A (paragraphs 0009 to 0020, FIGS. 3 and 4)

  However, the LED provided in the ring light described in Patent Document 1 is a bullet-shaped LED and has a low power. For this reason, as shown in FIG. 9A, the ring light 101 is connected to a lens unit 110 provided with a camera lens, and the lens unit 110 is attached to a camera body 120 for photographing, so that an image of a subject is obtained. When the LED is caused to emit light for photographing (or an image), a plurality of dot-like light sources 901 arranged in a ring shape are formed. As a result, the lighting effect of the subject becomes uneven. Specifically, in order to capture a video (eye catch) in which a “uniform ring” is projected on a person's pupil for production, as shown in FIG. The image is captured in a state where a dot-shaped ring reflecting the dot-shaped light source 901 is reflected at 902.

  Further, in the case of a ring light in which a plurality of LEDs are arranged in the radial direction and arranged radially, it becomes a plurality of point light sources or a linear light source arranged radially. Therefore, the conventional ring light has a problem that it is difficult to form a ring-shaped light source (surface light source) as a whole.

Further, the conventional ring light having a heat dissipation mechanism has a problem that the ring light itself becomes large due to the heat dissipation mechanism.
Also, in the case of increasing the number of ring light LEDs themselves, increasing the arrangement density, or using high power SMD type (Surface Mount Device) LEDs to form a surface light source The amount of heat generated by the LED will increase. Therefore, when forming the surface light source, it is required to arrange the LEDs in consideration of the heat generated by the LEDs.
Furthermore, if the inner diameter of the ring light becomes too small due to the downsizing of the ring light, there will be a problem that when the wide lens for photographing is connected to the ring light, a mist (a lighting fixture enters the screen) occurs. .

  The present invention has been made in view of the above problems, and an object thereof is to provide a ring light capable of forming a surface light source.

  In order to achieve the above object, a ring light according to claim 1 of the present invention is a ring light having an annular substrate and a plurality of LEDs provided on one surface of the substrate. A first LED group consisting of the LEDs arranged in a row in the circumferential direction, and a second LED group consisting of the LEDs arranged in a row in the circumferential direction at a second interval on the inner circumference side of the first LED group; An annular diffusion plate, and the number of LEDs of the first LED group is the same as the number of LEDs of the second LED group, and the LEDs of the first LED group are the second LED group. It was decided to be arranged between two adjacent LEDs.

  According to this configuration, the ring light diffuses the light emitted from the LEDs belonging to both the LED groups by the diffusion plate. Here, the diffusion plate overlaps the first overlapping region, which is a region where light emitted from two adjacent LEDs of the first LED group overlaps, and the light emitted from two adjacent LEDs of the second LED group. It is installed over the second overlapping area that is the area.

According to this, the light emitted from two adjacent LEDs of the first LED group is incident on the diffuser plate, and the light emitted from the two adjacent LEDs of the second LED group is incident on the diffusion plate. Is done. Therefore, incident light can be diffused efficiently, and as a result, a surface light source can be formed. Here, since there is a predetermined width in the optical axis direction of the first overlapping region and the second overlapping region, the diffusion plate is located at a position closest to the LED among the predetermined widths of the first overlapping region and the second overlapping region. It is preferable to be disposed.
The ring light has the same number of LEDs in the first LED group as the number of LEDs in the second LED group, and the LEDs in the first LED group and the LEDs in the second LED group are alternately arranged. It becomes easy to form a light source.

  Further, in the ring light according to claim 2, in the ring light according to claim 1, the diffusion plate is a flat plate and is installed in parallel to one surface of the substrate.

  According to such a configuration, the ring light can be easily manufactured because the structure of the diffusion plate is simple. The ring light has a flat diffusion plate and is installed in parallel with one surface of the substrate. Therefore, the distance from the diffusion plate to the LEDs of the first LED group and the distance from the diffusion plate to the LEDs of the second LED group are: Will be equal. In addition, since the first interval and the second interval are different, the diffusion plate has a distance from one surface of the substrate, the length from the LED of the first LED group to the first overlapping region, and the second distance from the LED of the second LED group. It is preferably equal to the average value with the length to the overlapping region.

  The ring light according to claim 3 is the ring light according to claim 1, wherein the distance from the one surface of the diffuser plate is farther from the first LED group side than the second LED group side. It was decided to be installed at an inclination.

  According to this configuration, since the number of LEDs in the first LED group is equal to the number of LEDs in the second LED group, the length of the ring light from the LEDs in the first LED group to the first overlapping region is the length of the second LED group. Although it is longer than the length from the LED to the second overlapping region, the diffusion plate is inclined so as to be farther from the first LED group side than the second LED group side, so that the first overlapping region and the second overlapping region are surely Can be installed over. In addition, the first interval, the second interval, and the difference between the radius of the first LED group and the radius of the second LED group can be determined independently.

  The ring light according to claim 4 is the ring light according to claim 3, wherein the diffusion plate is irradiated from a predetermined LED of the first LED group and an LED of the second LED group adjacent to the LED. It was decided to be installed across the third overlapping region, which is a region where light overlaps, the first overlapping region, and the second overlapping region.

  According to this configuration, in addition to the positional relationship between the LEDs of the first LED group and the positional relationship between the LEDs of the second LED group, the ring light includes the predetermined LED of the first LED group and the second LED adjacent to the LED. Since the inclination of the diffusion plate can be determined based on the relative positional relationship between the two LEDs in the group, it becomes easy to form a surface light source.

According to the first aspect of the present invention, since the diffusion plate is provided at the position where the light emitted from the two adjacent LEDs is overlapped and incident, the surface light source can be formed.
According to the invention described in claim 2, since the structure of the diffusion plate is simple, the ring light can be easily manufactured.

According to the third aspect of the invention, since the diffusion plate is inclined, the diffusion plate can be reliably installed over the first overlapping region and the second overlapping region.
According to the invention described in claim 4, since the inclination of the diffusion plate can be determined reflecting the correlation between the inner peripheral side LED and the outer peripheral side LED, it becomes easy to form a surface light source.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
The configuration of the ring light according to the first embodiment will be described with reference to FIGS. 1 to 3.
FIG. 1 is a plan view of a ring light according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the ring light shown in FIG. 1 taken along the line AA, and FIG. It is a BB sectional view taken on the line of the ring light shown.

The ring light 1 is used by being connected to the lens unit 10. The lens unit 10 includes a camera lens 11, a light connection frame 12, and a filter unit 13.
The camera lens 11 is, for example, a wide lens for shooting a high-definition video, and the center thereof is coaxial with the center of the ring light 1.
The light connection frame 12 is an adapter disposed at the tip of the lens unit 10 for connection with the ring light 1.
The filter unit 13 holds various filters in front of the camera lens 11. Here, two filter units 13 are provided between the ring light 1 and the camera lens 11.
The lens unit 10 is used with its base end attached to the camera body 20 (see FIG. 6).

  As shown in FIGS. 1 to 3, the ring light 1 includes a substrate 2, a plurality of LEDs 3 (3 a, 3 b), a diffusion plate 4, a lens connection member 5, and a heat sink 6. A power cord (not shown) for feeding power to the LED 3 is connected to the top of the ring light 1 (upper side in FIG. 1). Thereby, when an operator operates the lens part 10, a power cord (not shown) does not get in the way.

  The board | substrate 2 is formed in the annular | circular shape, the some LED3 is provided in one surface, and the heat sink 6 is formed in the other surface. The substrate 2 is made of the same lightweight metal as the heat sink 6, such as aluminum. Further, the substrate 2 has an inner diameter and a lens connecting member 5 so that when the camera lens 11 is connected via the lens connecting member 5, the photographing range of the camera lens 11 is smaller than the inner diameter of the substrate 2. The arrangement position is determined.

The LED 3 is a high-intensity white LED, and is composed of, for example, an SMD type LED. A plurality (48 in FIG. 1) of LEDs 3 includes a first LED group composed of LEDs 3a arranged in a row in the circumferential direction with a first interval on the substrate 2, and a second interval on the inner peripheral side of the first LED group. And a second LED group composed of LEDs 3b arranged in a row in a circumferential direction.
The number of LEDs 3a and the number of LEDs 3b are the same. Moreover, LED3a is arrange | positioned between two adjacent LED3b (chidori arrangement). That is, a straight line connecting the LED 3 a and the intermediate position between the two LEDs 3 b adjacent to the LED 3 a coincides with the radial direction of the substrate 2.

  The diffusing plate 4 has an annular shape and diffuses the light emitted from the LEDs 3a and 3b. The diffuser plate 4 is adjacent to the first overlapping region where the light emitted from the two adjacent LEDs 3a intersects with each other. It is installed over a second overlapping region that is a region where light emitted from the two LEDs 3b intersect. The diffusion plate 4 is installed so as to be inclined so that the distance from one surface of the substrate 2 is farther from the first LED group side than from the second LED group side.

Here, the first overlapping region and the second overlapping region will be described with reference to FIG. 4A and 4B are explanatory diagrams of light emitted from the adjacent LEDs shown in FIG. 1, in which FIG. 4A shows the outer peripheral side, and FIG. 4B shows the inner peripheral side.
As shown in FIG. 4A, two adjacent LEDs 3a are arranged on the substrate 2 with a first interval Da. Each LED 3a emits light at a radiation angle θ. Thereby, the light irradiated from each LED3a crosses in the position of height (distance) Ha from each LED3a. The upper area in the figure including the position of the height Ha is the first overlapping area.

  Further, as shown in FIG. 4B, two adjacent LEDs 3b are arranged on the substrate 2 with a second interval Db (<Da). Each LED 3b emits light at a radiation angle θ. Thereby, the light irradiated from each LED3b crosses in the position of height (distance) Hb (<Ha) from each LED3b. The upper region in the drawing including the position of the height Hb is the second overlapping region.

As shown in FIGS. 2 and 3, the diffuser plate 4 includes an inner annular portion 41, an outer annular portion 42, and an annular portion 43.
The inner annular portion 41 has a proximal end connected to an inner peripheral side edge of the substrate 2, and is erected vertically along the inner periphery of the substrate 2. The height (width) of the inner annular portion 41 is the height up to the position closest to the LED 3b in the second overlapping region, which is a region where light emitted from two adjacent LEDs 3b intersects, that is, the height Hb. (See FIG. 4B).

  The outer annular portion 42 has a base end connected to the outer peripheral side edge portion of the substrate 2, and stands vertically along the outer periphery of the substrate 2. The height (width) of the inner annular portion 41 is the height to the position closest to the LED 3a in the first overlapping region, which is a region where light emitted from two adjacent LEDs 3a intersects, that is, the height Ha. (See FIG. 4A).

  The circular ring part 43 is a side part of a truncated cone having a predetermined inclination. The annular portion 43 has an inner peripheral side connected to the tip of the inner annular portion 41 and an outer peripheral side connected to the tip of the outer annular portion 42. A shape obtained by projecting the annular portion 43 onto the substrate 2 is a ring similar to that of the substrate 2. The annular portion 43 is made of a material that is transparent or translucent and transmits and diffuses the light of the LED 3, such as glass or synthetic resin. The inner annular portion 41 and the outer annular portion 42 are made of a material that is opaque (for example, black) and shields or absorbs light from the LED 3, such as a metal or a synthetic resin.

  Here, the inclination angle of the diffusion plate 4 will be described with reference to FIG. FIG. 5 is an explanatory diagram of the inclination angle of the diffusion plate. The LED 3b shown in FIG. 5 is a reference LED indicating one of the second LED groups, and the LED 3a shown in FIG. 5 is adjacent to the LED 3b which is this reference LED. For example, when the LED 3b is in the uppermost part (the position at 12 o'clock) in FIG. 1, the LED 3a is positioned in either the left or right direction of the LED 3b. FIG. 5 shows a cross section (cut surface) obtained by cutting the ring light 1 along a straight line (radial straight line) connecting the position of the LED 3 b as the reference LED and the center of the substrate 2. Therefore, the temporary distance when the LED 3b is projected on the cut surface is shown as the distance between the LED 3a and the LED 3b, and as the irradiation range indicating the light from the LED 3b, the LED 3b is placed at a correct distance from the LED 3a. The provisional irradiation range when temporarily arranged is illustrated. Therefore, in FIG. 5, the deviation | shift between LED3b and an irradiation range is shown.

The inclination angle of the diffusion plate 4 can be determined as follows, for example.
First, with respect to the LED 3b as the reference LED, the height to the second overlapping region is Hb at a position separated by a half value of the second interval Db (see FIG. 4B) toward the inner peripheral side in the horizontal direction. The point which is (refer FIG.4 (b)) is defined as an inner peripheral side end point.

  Next, with respect to the LED 3a, the height to the first overlapping region is Ha (see FIG. 4 (FIG. 4 (A)) at a position separated by a half value of the first interval Da (see FIG. a) Reference) is determined as the outer peripheral end point. Here, the position when the LED 3a is on the cut surface is defined as a horizontal base point. Then, a straight line connecting the inner peripheral side end point and the outer peripheral side end point is obtained. At this time, the angle α from the horizontal plane is defined as the inclination angle of the diffusion plate 4. The angle α is preferably 5 to 6 °.

  The diffusing plate 4 is installed over the third overlapping region, which is an overlapping region of light emitted from the LED 3a and the LED 3b adjacent to the LED 3a, the first overlapping region, and the second overlapping region. You may make it do. According to this, since the light overlapping region on the circumference of the average radius of the radius of the position where the LED 3a is disposed and the radius of the position where the LED 3b is disposed can be reflected on the substrate 2, the LED 3 When light is emitted, a surface light source with improved visual uniformity can be formed.

Returning to FIG. 1 to FIG.
The lens connection member 5 is a member that connects the ring light 1 and the light connection frame 12 of the lens unit 10 on the other surface side of the ring light 1. As shown in FIGS. 1 and 2, the lens connecting members 5 are respectively provided above and below in the vertical direction when connected to the lens unit 10. This corresponds to the horizontal field angle of the inner periphery of the ring light 1 (see the broken line in FIG. 3) and the vertical field angle (see the broken line in FIG. 2) corresponding to the aspect ratio (16: 9) for horizontally long high vision. This is for securing a sufficient strength to support the ring light 1. Furthermore, the arrangement position of the lens connecting member 5 on the substrate 2 is connected to a position where no blur occurs in the state where the filter unit 13 is provided in front of the camera lens 11.

  The heat sink 6 emits heat generated with light irradiation from the LED 3. Since the heat of the LED 3 is mainly generated at the base end of the LED 3, the heat can be efficiently radiated by forming the heat sink 6 on the other surface of the substrate 2. As a result, the LED 3 can emit light continuously, so that the ring light 1 can be used during moving image shooting. In the heat sink 6, the number (interval) and length of plates are determined based on the number of LEDs 3, the size of the substrate 2, the heat radiation efficiency, and the like. For example, as shown in FIG. 3, it is preferable that the number of plates of the heat sink 6 is about the number of LEDs 3, and the length of the plate is about the distance between the diffusion plate 4 and the substrate 2. Is preferred.

FIGS. 6A and 6B are explanatory views of the operation of the ring light shown in FIG. 1, wherein FIG. 6A shows the light emission of the ring light, and FIG. 6B shows the light emission of FIG.
As shown in FIG. 6A, the ring light 1 is connected to a lens unit 10 and the lens unit 10 is attached to a camera body 20 for shooting to shoot a video (or image) of a subject. When the LED 3 is caused to emit light, a ring-shaped light emitting surface (surface light source) 601 is formed. As a result, a uniform lighting effect is exerted on the subject. Specifically, in order to capture a video (eye catch) in which a “uniform ring” is projected on a person's pupil for production, as shown in FIG. Shooting can be performed with a ring 602 reflecting a ring-shaped light emitting surface (surface light source) 601 reflected.

  Since the center of the ring light 1 is coaxial with the center of the camera lens 11 (see FIGS. 1 to 3) of the lens unit 10, when used as illumination for illuminating a person's face, the corners of the eyes, nose, chin, etc. There is an effect that no shadow appears. In addition, since the LED 3 of the ring light 1 does not generate heat in the irradiation direction (tip), it can be used as a close-up light for photographing important cultural properties and insects and plants.

  According to the ring light 1 of the first embodiment, since the diffusion plate 4 is installed over the first overlapping region and the second overlapping region where light emitted from two adjacent LEDs 3 overlaps, a surface light source can be formed. . In addition, since the plurality of LEDs 3 are arranged in two rows in a ring shape, it is easier to form a surface light source than in the case where the LEDs 3 are arranged in one row. Also, the illuminance is improved by the two rows of LEDs 3 (3a, 3b), and sufficient illuminance can be secured as a lighting fixture for a broadcasting high-vision camera. Moreover, since the heat sink 6 is formed integrally with the substrate 2, heat generated by light emission can be efficiently released even when a high-luminance white LED is used for a long time.

(Second Embodiment)
7A and 7B are schematic views showing the configuration of a ring light according to the second embodiment of the present invention, where FIG. 7A is a plan view, and FIG. 7B is a cross-sectional view taken along the line CC in FIG. Show.
The ring light 1 </ b> A shown in FIG. 7 is used by being connected to the lens unit 10. The lens unit 10 is the same as that described with reference to FIGS.

The ring light 1A includes a substrate 2A, a plurality of LEDs 3 (3a, 3b), a diffusion plate 4A, a lens connection member 5A, and a heat sink 6A.
The substrate 2A and the heat sink 6A are the same as the substrate 2 and the heat sink 6 shown in FIG. The LEDs 3 provided in the ring light 1A are the same as the LEDs 3 shown in FIG. 1 except for the number (30 in FIG. 7A). Each of the ring lights 1A is provided with 15 LEDs 3a and 3b.

  The diffusing plate 4A is an annular flat plate and is the same as the diffusing plate 4 shown in FIGS. 1 to 3 except that the diffusing plate 4A is installed in parallel to the substrate 2A. That is, in the diffusion plate 4A, the distance from the LED 3a is the same as the distance from the LED 3b. As shown in FIG. 7B, the diffusing plate 4A includes an inner annular portion 41A, an outer annular portion 42A, and an annular portion 43A.

The inner annular portion 41A and the outer annular portion 42A are the same as the inner annular portion 41 and the outer annular portion 42 shown in FIGS. 2 and 3 except that the height (width) is equal to each other. is there.
The height of the inner annular portion 41A (distance from the LED 3a to the diffusion plate 4A) and the height of the outer annular portion 42A (distance from the LED 3b to the diffusion plate 4A) are the lengths from the LED 3a to the first overlapping region. And the average value of the length from the LED 3b to the second overlapping region is preferable. That is, the height (width) of the inner annular portion 41A and the outer annular portion 42A is preferably equivalent to a height corresponding to Ha (see FIG. 4A) and Hb (see FIG. 4B). The average height with the height to be.

  The lens connection member 5 </ b> A is a member that connects the ring light 1 </ b> A and the light connection frame 12 of the lens unit 10 on one surface side of the ring light 1. As shown in FIG. 7, the lens connecting member 5A has an annular portion along the inner periphery of the substrate 2A, and a plurality (3 in FIG. 7) for projecting from the annular portion and screwing to the substrate 2A. ) Projections.

  According to the second embodiment, the ring light 1A can be easily manufactured because the structure of the diffusion plate 4A is simpler than that of the diffusion plate 4 shown in FIGS. Therefore, it is possible to form the surface light source with a simple configuration.

(Third embodiment)
In the ring light according to the third embodiment of the present invention, the diffusion plate 4A (see FIG. 7) is an annular flat plate, and the LED 3b (see FIG. 7) extends from the LED 3a (see FIG. 7) to the first overlapping region. The ring light 1A shown in FIG. 7 is the same as the ring light 1A shown in FIG. 7 except that the length is higher than the LED 3a (see FIG. 7) by the difference between the LED 3b (see FIG. 7) and the second overlapping region. Since it is the same, illustration of the whole structure is abbreviate | omitted.

FIG. 8 is an explanatory diagram of light emitted from the LED provided in the ring light according to the third embodiment of the present invention and the LED adjacent to the LED.
As shown in FIG. 8, the LED 3b is arranged at a position higher than the LED 3a by the difference between the length Ha ′ and the length Hb ′. Here, the length Ha ′ is a length corresponding to the length Ha shown in FIG. 4A, and the length Hb ′ is a length corresponding to the length Hb shown in FIG. It is. That is, in the ring light substrate 2A of the third embodiment, the inner peripheral side is raised compared to the outer peripheral side. In FIG. 8, the surface of the substrate 2 </ b> A (see FIG. 7) is illustrated as having a step (step), but the substrate 2 </ b> A may be raised with a smooth gradient.

  Further, the LED 3a and the LED 3b closest to the LED 3a are provided apart from each other by a distance Dc on the substrate 2A (see FIG. 7). LED3a and LED3b irradiate light with radiation angle (theta). As a result, the light emitted from the LED 3a and the LED 3b intersects from the LED 3a at a height corresponding to the height (distance) Ha, that is, from the LED 3b at a height corresponding to the height (distance) Hb. The upper region in the figure including the position where the irradiated light intersects is the third overlapping region.

  Here, in the ring light of the third embodiment, the two adjacent LEDs 3a maintain the height relationship corresponding to the height Ha shown in FIG. Between the LEDs 3b, a height relationship corresponding to the height Hb shown in FIG. 4B is maintained. In addition, in the corresponding plan view (FIG. 7), the position where the irradiated light in the cross-sectional view shown in FIG. 8 intersects the radius of the position where the LED 3a is arranged on the substrate 2A and the arrangement of the LED 3b. It exists on the circumference of the average radius with the radius of the determined position.

  According to the third embodiment, the ring light 1A can be easily manufactured because the structure of the diffusion plate 4A is simpler than that of the diffusion plate 4 shown in FIGS. Moreover, the space | interval (1st space | interval) of LED3a, the space | interval (2nd space | interval) of LED3b, and the difference of the radius of a 1st LED group and the radius of a 2nd LED group can be designed independently.

  As mentioned above, although this invention was demonstrated based on each embodiment, this invention is not limited to these. For example, in order to prevent the ring light 1 from falling off the lens unit 10 during shooting, a drop prevention chain or the like is provided in the ring light 1 and the fall prevention chain or the like is connected to the camera body 20. May be used.

It is a top view of the ring light which concerns on the 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of the ring light shown in FIG. It is a BB sectional view taken on the line of the ring light shown in FIG. It is explanatory drawing of the light irradiated from adjacent LED shown in FIG. 1, (a) has shown the outer peripheral side, (b) has each shown the inner peripheral side. It is explanatory drawing of the inclination-angle of a diffusion plate. It is explanatory drawing of an effect | action of the ring light shown in FIG. 1, Comprising: (a) is light emission of a ring light, (b) has shown the mode that light emission of (a) was reflected on the pupil of a person, respectively. It is a schematic diagram which shows the structure of the ring light which concerns on the 2nd Embodiment of this invention, Comprising: (a) is a top view, (b) has each shown the CC sectional view taken on the line in (a). It is explanatory drawing of the light irradiated from LED provided in the ring light of the 3rd Embodiment of this invention, and LED adjacent to the said LED. It is explanatory drawing of the effect | action of the conventional ringlight, Comprising: (a) is light emission of a ringlight, (b) has shown the mode that light emission of (a) was reflected on the pupil of a person, respectively.

Explanation of symbols

1, 1A ring light 2, 2A substrate 3 (3a, 3b) LED
4, 4A Diffuser 41, 41A Inner ring part 42, 42A Outer ring part 43, 43A Annulus part 5, 5A Lens connection member 6, 6A Heat sink 10 Lens part 11 Camera lens 12 Light connection frame 13 Filter part 20 Camera Body

Claims (4)

In a ring light having an annular substrate and a plurality of LEDs provided on one surface of the substrate,
A first LED group consisting of the LEDs arranged in a circumferential direction in a row at a first interval;
A second LED group consisting of the LEDs arranged in a row in the circumferential direction at a second interval on the inner peripheral side of the first LED group;
An annular diffusion plate that diffuses light emitted from the LEDs belonging to both the LED groups,
The number of LEDs of the first LED group is the same as the number of LEDs of the second LED group, and the LEDs of the first LED group are arranged between two adjacent LEDs of the second LED group. And
The diffusion plate is a first overlapping region where light emitted from two adjacent LEDs in the first LED group overlaps and a region where light emitted from two adjacent LEDs in the second LED group overlaps. Installed across a second overlapping area,
A ring light characterized by that.   The ring light according to claim 1, wherein the diffusion plate is a flat plate and is installed in parallel with one surface of the substrate.   2. The ring light according to claim 1, wherein the diffusion plate is installed so as to be inclined such that a distance from one surface of the substrate is farther from the first LED group side than from the second LED group side.   The diffusion plate includes a third overlapping region, which is a region where light emitted from a predetermined LED of the first LED group and an LED of the second LED group adjacent to the LED overlaps, the first overlapping region, The ring light according to claim 3, wherein the ring light is installed over the second overlapping region.

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