JP7043227B2 - Underwater strobe device and its translucent cover - Google Patents

Description

The present invention relates to an underwater strobe device for irradiating an underwater subject with a flash of light to sharpen a photographed image and a translucent cover portion thereof.

In water, the wavelength component on the red side of sunlight is absorbed more strongly than the wavelength component on the blue side, so that the captured image obtained in water is bluish as a whole. For this reason, in underwater photography, underwater strobe devices that irradiate the subject with a strong flash of light and enable the acquisition of colorful and attractive images similar to those obtained on the ground are often used (patented). Document 1).

As shown in Patent Document 1, the underwater strobe device has a built-in discharge type light emitting unit and is generally used by being connected to an underwater camera via a flexible arm.

The flexible arm is configured to be bendable and to hold the underwater strobe device so that it can rotate vertically and horizontally. By operating this flexible arm, wide-angle shooting to shoot a wide range or a subject at a short distance Appropriate flash irradiation that flexibly corresponds to various shooting scenes such as macro shooting is possible.

Japanese Unexamined Patent Publication No. 2000-33074

Conventionally, the irradiation direction of the underwater strobe device can be freely adjusted by operating the flexible arm, but we would like to expand the irradiation range of the underwater strobe device so that a wider range can be clearly photographed. , There is a request.

In particular, in underwater photography, it is more difficult to operate at hand and the subject often moves more frequently than in land photography, so it tends to be more difficult to properly adjust the irradiation direction of the subject than in land photography. Therefore, it is desired to expand the irradiation range of the underwater strobe device so that the subject can be more appropriately irradiated with the flash.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a translucent cover portion of an underwater strobe device capable of irradiating a wider range and an underwater strobe device provided with the transmissive cover portion.

In order to solve the above-mentioned problems, the invention according to claim 1 comprises an underwater strobe device including a light emitting unit and a housing to which the light emitting unit is mounted, and connected to an underwater camera via a flexible arm. A translucent cover for an underwater strobe device, which is fixed to the front end of the housing and is formed to bulge outward of the housing to cover the front of the light emitting portion in a watertight state. A part of a circle having a cross-sectional shape formed into an arc shape as a whole and having a diameter dimension equal to or smaller than the width dimension of the housing in a direction orthogonal to the light emitting axis of the light emitting portion. The angle formed by the inner peripheral tangent line of the translucent cover portion and the flash of light emitted from the light emitting portion and traveling through the air layer in the floodlight cover portion approaches 90 degrees. It is characterized in that it is formed in such a manner .

The "curvature" is used as the reciprocal of the radius of curvature from the center of a circle whose part is a minute arc at an arbitrary position on the inner peripheral surface of the translucent cover portion to the minute arc.

The "width dimension of the housing" takes the maximum dimension of the housing in the direction orthogonal to the light emitting axis when the housing is non-circular when the housing is viewed along the light emitting axis of the light emitting portion.

In order to solve the above-mentioned problems, the invention according to claim 2 comprises an underwater strobe device including a light emitting unit and a housing to which the light emitting unit is mounted, and connected to an underwater camera via a flexible arm. A translucent cover for an underwater strobe device, which is fixed to the front end of the housing and is formed to bulge outward of the housing to cover the front of the light emitting portion in a watertight state. The cross-sectional shape of the portion is formed into an arc shape as a whole , and the angle formed by the inner peripheral tangent line of the translucent cover portion and the flash of light emitted from the light emitting portion and traveling through the air layer in the floodlight cover portion is formed. It is characterized in that it is formed so as to approach 90 degrees .

The invention according to claim 3 relates to the translucent cover portion according to claim 1 or 2, wherein the translucent cover portion is formed on a plurality of inner peripheral surface portions of the translucent cover portion. It is characterized by having an inner peripheral surface prism portion composed of unevenness.

The invention according to claim 4 relates to the inner peripheral surface prism portion according to claim 3, wherein the inner peripheral surface prism portion has a honeycomb structure in which hexagonal concave portions or convex portions are arranged in a grid pattern. It is characterized by.

In order to solve the above-mentioned problems, the invention according to claim 5 is an underwater strobe device provided with a translucent cover portion according to any one of claims 1 to 4, wherein the housing is described. It is characterized by comprising a separation prism portion having a prism plate fixed to the front end portion of the light emitting portion and changing the course of the flash of the light emitting portion and a prism support leg that supports the prism plate in a state of being separated from the front end portion of the housing. do.

In order to solve the above-mentioned problems, the invention according to claim 6 is an underwater strobe device provided with the translucent cover portion according to any one of claims 1 to 4, wherein the translucent device is provided. It is arranged on the outside of the cover portion and protrudes in the irradiation direction of the flash so as to partially block the diffusion of the flash emitted from the light emitting portion and transmitted through the translucent cover portion, and also toward the outer periphery of the translucent cover portion. It is characterized by having a hood portion provided so as to be rotatable.

Usually, the refractive index of the thick layer (for example, acrylic layer) of the translucent cover portion that watertightly covers the light emitting portion inside is larger than the refractive index of the air layer inside the translucent cover portion. For this reason, in the conventional translucent cover portion (for example, Patent Document 1) having a substantially flat structure, the components of the flashes emitted from the light emitting portion that are not orthogonal to the inner peripheral tangent line of the translucent cover portion, particularly. The components of the flash that travels toward the peripheral edge of the inner peripheral surface of the translucent cover portion are the inner peripheral tangent line of the translucent cover portion and the flash that is emitted from the light emitting portion and travels through the air layer in the floodlight cover portion. Since the angle formed by the light is close to 90 degrees, the angle of refraction toward the light emitting axis increases according to the angle formed with the tangent line of the inner peripheral surface of the translucent cover portion, and the irradiation range is caused by the convergence of light. Was easy to get narrow.

Here, the translucent cover portion according to claim 1 has a cross-sectional shape formed in an arc shape as a whole, and the inner peripheral surface portion is equal to or less than the width dimension of the housing in a direction orthogonal to the light emitting axis of the light emitting portion. It is formed in an arc shape having a curvature forming a part of a circle having a diameter dimension, and the curvature of the translucent cover portion is set to be larger than that of a conventional translucent cover portion (for example, Patent Document 1). .. For this reason, it is easy to ensure good orthogonality of the angle formed with the tangent line of the inner peripheral surface of the translucent cover portion even for the component of the flash that travels toward the peripheral edge of the inner peripheral surface of the translucent cover portion. It is possible to suppress the angle of refraction toward. As a result, in the translucent cover unit according to claim 1, the convergence of light can be suppressed as compared with the conventional translucent cover unit, and the irradiation range can be expanded.

Further, the translucent cover portion according to claim 2 has an overall arcuate cross-sectional shape, and the annular mounting portion of the translucent cover portion in a direction in which the inner peripheral surface portion is orthogonal to the light emitting axis of the light emitting portion. It is formed in an arc shape with a curvature forming a part of a circle having a diameter dimension equal to or less than the maximum dimension of the above, and the curvature of the translucent cover portion is higher than that of the conventional translucent cover portion (for example, Patent Document 1). It is set large. Therefore, regarding the component of the flash that travels toward the peripheral edge of the inner peripheral surface of the translucent cover portion, the inner peripheral surface tangent line of the translucent cover portion and the air emitted from the light emitting portion and inside the light projecting cover portion. Since the angle formed by the flash traveling through the layer is formed so as to approach 90 degrees, it is easy to ensure good orthogonality between the angle formed by the inner peripheral tangent line of the translucent cover portion and toward the light emitting axis. It is possible to suppress the angle of refraction. As a result, in the translucent cover unit according to claim 2, the convergence of light can be suppressed as compared with the conventional translucent cover unit, and the irradiation range can be expanded.

Therefore, according to the translucent cover unit according to claim 1 or 2, the flash can be spread over a wider range as compared with the conventional translucent cover, and a wider range can be clearly photographed. Is possible.

As a result, even in underwater photography where it is more difficult to operate at hand and the subject often moves compared to land photography, it is possible to irradiate the subject more appropriately, and it is easy to obtain a good image. It becomes.

For example, if a colored diffuser plate that diffusely reflects and diffuses light is used in front of the translucent cover portion or in place of the translucent cover portion, the flash of light in the light emitting portion is absorbed, and the irradiation range is expanded and the irradiation brightness is increased. It tends to drop. On the other hand, according to the translucent cover portion according to claim 1 or 2, the light convergence can be suppressed by the shape of the translucent cover portion, and therefore, the irradiation range is expanded while suppressing the absorption of the flash. Can be planned.

Further, in the translucent cover portion according to claim 1 or 2, since the curvature of the translucent cover portion is set to be larger than that of the conventional translucent cover portion, the translucent cover portion is larger than the conventional one. It is easy to secure a large distance from the inner space or the light emitting part to the inner peripheral surface part of the translucent cover part.

Therefore, according to the translucent cover portion according to claim 1 or 2, the distance from the translucent cover portion to the light emitting portion mounted on the front end portion of the housing tends to be larger than before, and the light emitting portion of the light emitting unit. It becomes easy to suppress the deterioration of the translucent cover portion due to the influence of the flash heat. Therefore, it becomes easy to maintain the intended effect of light transmission and diffusion of the underwater strobe device.

Since the translucent cover portion according to claim 3 has an inner peripheral surface prism portion formed by a plurality of irregularities formed on the inner peripheral surface portion, the flash emitted from the light emitting portion has an inner peripheral surface. The course is changed at the prism part.

Due to the unevenness of the prism portion on the inner peripheral surface, the flash of the light emitting portion can be collected in a specific direction or diffused and distributed in a circular shape, and the irradiation can be adjusted according to the purpose and effect of photography. The shape of the unevenness can be set according to the purpose and effect of shooting.

Conventionally, a translucent plate called a prism plate is arranged in front of or near the light emitting portion, and the irradiation effect is manipulated by collecting the flashes of the light emitting portion in a specific direction or diffusing the light in a circular shape.

According to the third aspect of the present invention, the effect of the prism plate can be obtained by the structure of the inner peripheral surface of the translucent cover portion without separately providing the prism plate, so that the structure of the underwater strobe device can be obtained. Can be simplified.

Further, since the inner peripheral surface prism portion is provided on the inner peripheral surface portion of the translucent cover portion, the influence of the flash heat of the light emitting portion is compared with the conventional prism plate fixed to the housing side of the underwater strobe device. It is possible to suppress the deterioration due to. Therefore, it becomes easy to maintain the intended effect of light transmission and diffusion of the underwater strobe device.

The translucent cover portion according to claim 4 has a hexagonal honeycomb structure in which the prism portions on the inner peripheral surface are arranged in a grid pattern, so that the unevenness that functions as a prism is densely arranged along the curved circumferential surface. It is easy to arrange them in a grid pattern, and it is easy to provide an inner peripheral prism portion on the translucent cover portion of the underwater strobe device according to claim 1 or 2.

According to the underwater strobe device according to claim 5, in addition to the effect according to any one of claims 1 to 4, the following effects can be obtained.

According to the underwater strobe device according to claim 5, since the prism plate is supported in a state of being separated from the front end portion of the housing, it is not easily affected by the heat of the flash of the light emitting portion and is not easily deteriorated. Therefore, it becomes easy to maintain the intended effect of light transmission and diffusion of the underwater strobe device.

Further, the underwater strobe device according to claim 5 includes the translucent cover portion according to any one of claims 1 to 4, and is compared with a conventional translucent cover portion (for example, Patent Document 1). Since the curvature of the translucent cover portion is set to be large, it becomes easier to secure a larger distance from the inner space of the translucent cover portion and the light emitting portion to the inner peripheral surface portion of the translucent cover portion than in the conventional case.

Therefore, according to the underwater strobe device according to claim 5, it is possible to support the prism plate in a state of being farther from the front end portion of the housing than before, and it is possible to suppress deterioration due to the influence of flash heat of the light emitting portion. It will be easy. Therefore, it becomes easier to maintain the intended light transmission and diffusion effects of the underwater strobe device.

According to the underwater strobe device according to claim 6, in addition to the effect according to any one of claims 1 to 4, the following effects can be obtained.

According to the underwater strobe device according to claim 6, the hood portion can be rotated and moved in the direction of the lens of the underwater camera to block the flash of light transmitted through the translucent cover portion and directed toward the underwater camera.

Therefore, the intensity of the light emitted from the underwater strobe device and reflected by the floating particles in the water and incident on the lens of the underwater camera is reduced, and the reflection of annoying white spots caused by the floating matter in the water is suppressed in the captured image. be able to.

FIG. 1 is a diagram showing a usage example of the underwater strobe device of the first embodiment. FIG. 2 is a perspective view of the underwater strobe device of the first embodiment. FIG. 3 is a partial cross-sectional view taken along the line 1A-A of the underwater strobe device of the first embodiment. FIG. 4 is a perspective view of a separation prism portion constituting the underwater strobe device of the first embodiment. FIG. 5 is a diagram showing an irradiation range of the translucent cover portion constituting the underwater strobe device of the first embodiment. FIG. 6 is a cutaway partial view of the underwater strobe device of the second embodiment, and is a view corresponding to a partial cross-sectional view taken along the line AA.

The underwater strobe device and the translucent cover portion thereof according to the present invention will be described in detail with reference to the accompanying drawings based on the first embodiment.

(First Embodiment)
The underwater strobe device is a device that irradiates an underwater subject with a flash to sharpen a captured image. As shown in FIG. 1, the underwater strobe device 10 of the present embodiment has a light emitting unit 11 having a xenon tube. It includes a housing 12, a translucent cover portion 20, a separation prism portion 30, and a hood portion 40, and is used by being connected to an underwater camera 60 via a flexible arm 50.

The flexible arm 50 is configured to be bendable and to hold the underwater strobe device 10 so as to be rotatable in the vertical and horizontal directions. By operating the flexible arm 50, wide-angle shooting for shooting a wide range or a short distance can be performed. Appropriate flash irradiation that flexibly corresponds to various shooting scenes such as macro shooting of shooting a subject is possible.

Reference numeral 70 is a signal cable, which transmits the setting information of the built-in flash of the underwater photographing camera 60 to the underwater strobe device 60, and enables the flash control of the underwater strobe device 10 based on the flash setting information. There is.

<Case>
As shown in FIG. 1, the housing 12 of the underwater strobe device 10 projects outward from the substantially cylindrical main housing portion 13 and the main housing portion 13 that watertightly covers the control circuit of the light emitting unit 11 and the like. It has a substantially semi-cylindrical battery housing portion 14 integrally formed with the main housing portion 13, and a housing front end portion 15 that covers the periphery of the opening on the irradiation direction end side of the main housing portion 13. is doing.

<Translucent cover part>
FIG. 2 is a perspective view of the underwater strobe device 10 shown in FIG. 1 as viewed from another direction.
The translucent cover portion 20 of the underwater strobe device 10 is made of an acrylic resin bulging outward in the axial direction of the main housing portion 13, and is located in front of the light emitting portion 11 shown in FIG. It is configured to cover in a watertight state.

FIG. 3 is a diagram showing a main part of the underwater strobe device 10, and is a partial cross-sectional view taken along the line AA of FIG.
As shown in FIG. 3, the cross-sectional shape of the translucent cover portion 20 is formed in an overall arc shape, and the inner peripheral surface portion thereof is a main housing portion in a direction orthogonal to the light emitting axis 22 of the light emitting portion 11. It is formed in an arc shape having a curvature forming a part of a virtual circle 25 having a diameter 101 which is equal to or less than the dimension of the width 102 of 13.

As shown in FIG. 3, the end portion of the translucent cover portion 20 is fixed to the first annular mounting portion 16 fixed to the main housing portion 13 on the front side of the main housing portion 13. The rubber annular tool 18 pressed and sandwiched by the first annular mounting portion 16 and the translucent cover portion 20 is interposed, and the watertight state is maintained.

<Separation prism part>
As shown in FIG. 3, the underwater strobe device 10 includes a separation prism portion 30 provided so as to overlap the light emitting portion 11 in the direction of the light emitting shaft 22.

FIG. 4 is a perspective view of the separation prism portion 30. The separation prism portion 30 is fixed to the front end portion 15 of the housing, and has a prism plate 31 and a prism support leg 32 that supports the prism plate 31 in a state of being separated from the front end portion 15 of the housing.

The prism plate 31 of the separating prism portion 30 is formed in a substantially disk shape, and has a prism structure capable of diffusing into a circular shape by changing the course of the flash of the light emitting portion 11. The prism structure of the prism plate 31 is a honeycomb structure in which irregularities are arranged in a grid pattern.

As shown in FIGS. 3 and 4, the prism support legs 32 of the separation prism portion 30 are configured to support the prism plate 31 in a state of being separated from the front end portion 15 of the housing, and the light emitting portion 11 is provided in the vicinity of the light emitting portion 11. It has fixed portions 34, 34 fixed so as to straddle, and support portions 33, 33 extending from the fixed portion 34 along the light emitting shaft 22 so as to be away from the light emitting portion 11 and supporting the prism plate 31. ..

<Food section>
As shown in FIG. 2, the hood portion 40 of the underwater strobe device 10 is arranged outside the translucent cover portion 20, is formed in a substantially semicircular plane shape, and is emitted from the light emitting portion 11 shown in FIG. It protrudes in the irradiation direction of the flash so as to partially block the diffusion of the flash transmitted through the translucent cover portion 20. The hood portion 40 is made of a black synthetic resin.

Further, as shown in FIG. 2, the hood portion 40 is provided in the second annular mounting portion 17 that rotatably meshes with the first annular mounting portion 16 mounted on the front end side of the main housing portion 13 and is transparent. The optical cover portion 20 is provided so as to be rotatable in the outer peripheral direction.

Next, the effect of the underwater strobe device 10 of the first embodiment will be described.
FIG. 5 is a diagram showing an irradiation range of the underwater strobe device 10 of the present embodiment.

First, the refractive index will be illustrated below.
Air layer: Approximately 1.00
Acrylic resin layer: Approximately 1.49
Water layer: Approximately 1.33

The translucent cover portion 20 of the underwater strobe device 10 is made of acrylic resin. Therefore, among the flashes emitted from the light emitting unit 11 and traveling through the air layer 105, the components that are not orthogonal to the inner peripheral surface tangent line 108 of the translucent cover unit 20 are in contact with the inner peripheral surface of the translucent cover unit 20 due to the difference in the refractive index described above. The angle of refraction toward the light emitting shaft 22 increases according to the angle formed with the line 108, and the irradiation range tends to be narrowed due to the convergence of light.

As shown in FIG. 3, the translucent cover portion 20 constituting the underwater strobe device 10 of the present embodiment has an outer peripheral surface and an inner peripheral surface both having an overall arcuate cross-sectional shape. Further, the inner peripheral surface portion of the translucent cover portion 20 has a curvature forming a part of a circle 25 having a diameter 101 which is equal to or less than the dimension of the width 102 of the main housing portion 13 in the direction orthogonal to the light emitting axis 22 of the light emitting portion 11. As shown in FIG. 5, the curvature of the translucent cover portion is set to be larger than that of the conventional translucent cover portion (for example, Patent Document 1).

Therefore, as shown in FIG. 5, the flash 81 traveling through the air layer 105 toward the inner peripheral surface peripheral edge portion of the translucent cover portion 20 also has a substantially flat conventional translucent cover portion (for example, Patent Document 1). In comparison, the angle θ1 formed with the inner peripheral tangent line 108 tends to approach 90 °.

Therefore, when focusing on the flash of light incident on the translucent cover portion 20 and traveling through the acrylic resin layer 106, it is easier to suppress the reduction of the refraction angle θ2 toward the light emitting axis 22 as compared with the conventional translucent cover portion. Become.

As a result, in the translucent cover portion 20, the convergence of light can be suppressed as compared with the conventional translucent cover portion, and the irradiation range can be expanded.

Reference numeral 83 in FIG. 5 is a flash of light that passes through the acrylic resin layer 82 of the translucent cover portion 20 and travels through the water layer 107. The flash 83 is slightly refracted in the diffusion direction away from the light emitting axis 22 due to the difference in the refractive index between the acrylic resin layer 106 and the water layer 107 outside the acrylic resin layer 106.

The difference between the refractive index of the acrylic resin layer 106 and the refractive index of the water layer 107 outside the acrylic resin layer 106 is not as remarkable as the difference between the refractive index of the acrylic resin layer 106 and the refractive index of the air layer 105 inside the acrylic resin layer 106. Therefore, the effect of suppressing the convergence of the irradiation range by the translucent cover portion 20 is dominated by the difference in the refractive index between the acrylic resin layer 106 and the air layer 105 inside the acrylic resin layer 106 and the curvature of the acrylic resin layer 106.

Therefore, according to the translucent cover portion 20 of the underwater strobe device 10, since the curvature is set to be larger than that of the conventional translucent cover portion 20, the effect of suppressing the convergence of the irradiation range works strongly, and the flash flashes in a wider range. Will be distributed. Therefore, according to the translucent cover portion 20 of the underwater strobe device 10, it is possible to clearly photograph a wider range.

As a result, even in underwater photography where it is more difficult to operate at hand and the subject often moves compared to land photography, it is possible to irradiate the subject more appropriately, and it is easy to obtain a good image. It becomes.

For example, when a colored diffuser plate that diffusely reflects and diffuses light is used in front of the translucent cover portion 20 or in place of the translucent cover portion 20, the light of the light emitting portion 11 is absorbed and the irradiation range is expanded. The brightness of the irradiation tends to decrease.

According to the translucent cover portion 20, the shape of the translucent cover portion 20 can suppress the convergence of the flash, so that the irradiation range can be expanded while suppressing the absorption of the flash.

Further, as shown in FIG. 5, the translucent cover portion 20 has a larger curvature than the conventional translucent cover portion 27, so that the inner space is larger than that when the conventional translucent cover portion 27 is used. It is easy to secure a large size.

Therefore, according to the translucent cover unit 20, it becomes easier to secure a larger distance from the translucent cover unit 20 to the light emitting unit 11 than in the conventional case, and the permeation of the translucent cover unit 20 due to the influence of the flash heat of the light emitting unit 11 can be prevented. It will be easy to suppress. Therefore, it becomes easy to maintain the intended effect of light transmission and diffusion of the underwater strobe device 10.

Further, according to the underwater strobe device 10, since the prism plate 31 is supported in a state of being separated from the front end portion 15 of the housing as shown in FIG. 3, the prism plate 31 is less likely to be affected by the heat of the flash of the light emitting portion 11. It will be difficult to change in quality.

Further, according to the underwater strobe device 10, the hood portion 40 shown in FIG. 2 is rotated and moved in the direction of the photographing lens 61 of the underwater camera 60 as shown in FIG. 1, and is transmitted through the translucent cover portion 20 for photographing. It is possible to block the flash of light toward the lens 61.

Therefore, the intensity of the light emitted from the underwater strobe device 10 and reflected by the floating particles in the water and incident on the photographing lens 61 of the underwater camera 60 is reduced, and the obtrusive white spots caused by the floating matter in the water in the photographed image are reduced. The reflection can be suppressed.

(Second Embodiment)
FIG. 6 is a cutaway partial view of the underwater strobe device of the second embodiment, and is a view corresponding to a partial cross-sectional view taken along the line AA of FIG. The same configurations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6, the underwater strobe device 100 of the second embodiment has a plurality of irregularities formed in a hexagonal honeycomb shape in a plan view on the inner peripheral surface portion of the translucent cover portion 200 and can change the path of light. It has an inner peripheral prism portion 202 composed of portions. The P portion in FIG. 6 is an enlarged schematic view of a part of the inner peripheral surface portion of the translucent cover portion 200.

The inner peripheral surface prism portion 202 is provided on the entire inner peripheral surface portion of the translucent cover portion 200 or partially, depending on the design of the flash irradiation effect.

Next, the effect of the underwater strobe device 100 of the second embodiment will be described.
According to the underwater strobe device 100 of the present embodiment, the prism plate 31 is formed by the structure of the inner peripheral surface portion of the translucent cover portion 200 without separately providing the prism plate 31 as in the underwater strobe device 10 of the first embodiment. The effect of the above can be obtained, and the structure of the underwater strobe device can be simplified.

Although the underwater strobe device and the translucent cover portion thereof according to the present invention have been described above based on the first embodiment and the second embodiment, the specific configuration is not limited to these embodiments. ..

The inner peripheral surface portion of the translucent cover portion is formed in an arc shape having a curvature forming a part of a circle having a diameter equal to or less than the maximum width dimension of the entire housing including the main housing portion and the battery housing portion. Anything is fine.

Further, the translucent cover portion is used for an underwater strobe device including a light emitting portion and a housing to which the light emitting portion is mounted, and is fixed to the front end portion of the housing and is formed to bulge outward of the housing. It is a translucent cover part of an underwater strobe device configured to cover the front of the light emitting part in a watertight state. It may be formed in an arc shape having a curvature forming a part of a circle having a diameter dimension that is equal to or less than the maximum dimension of the annular mounting portion of the translucent cover portion in the direction orthogonal to the axis.

Further, the inner peripheral prism portion may have an uneven structure such as a flyeye lens, a lens array, or a prism array whose optical path changes.

The underwater strobe device of the present invention and the translucent cover portion thereof are flash irradiation techniques for irradiating an underwater subject with a flash to sharpen a photographed image, and have wide industrial potential.

10, 100 ... Underwater strobe device 11 ... Light emitting part 12 ... Housing 13 ... Main housing part 14 ... Battery housing part 15 ... Housing front end part 16 ... First annular mounting part 17 ... Second annular mounting part 18 ... Rubber annular tool 20, 200 ... Translucent cover part 22 ... Light emitting shaft 30 ... Separation prism part 31 ... Prism plate 32 ... Prism support leg 33 ... Strut part 34 ... Fixed part 40 ... Hood part 50 ... Flexible arm 60 ... For underwater use Camera 70: Signal cable 81: Flash advancing through the air layer inside the translucent cover portion 82: Flash advancing through the acrylic resin layer of the translucent cover portion 83: Flash advancing through the water layer outside the translucent cover portion 101: Diameter 102 ... Width 105 of the main housing ... Air layer 106 ... Acrylic resin layer 107 ... Water layer 108 ... Inner peripheral surface tangent line 202 ... Inner peripheral surface prism portion

Claims (6)

The housing is provided with a light emitting unit and a housing to which the light emitting unit is mounted, and is used in an underwater strobe device connected to an underwater camera via a flexible arm, and is fixed to the front end of the housing and of the housing. A translucent cover portion of an underwater strobe device that is formed to bulge outward and is configured to cover the front of the light emitting portion in a watertight state.
The cross-sectional shape is formed in an arc shape as a whole, and
The inner peripheral surface portion is formed in an arc shape having a curvature forming a part of a circle having a diameter dimension equal to or smaller than the width dimension of the housing in a direction orthogonal to the light emitting axis of the light emitting portion.
It is characterized in that the angle formed by the inner peripheral tangent line of the translucent cover portion and the flash of light emitted from the light emitting portion and traveling through the air layer in the floodlight cover portion approaches 90 degrees . Translucent cover for underwater strobe device. The housing is provided with a light emitting unit and a housing to which the light emitting unit is mounted, and is used in an underwater strobe device connected to an underwater camera via a flexible arm, and is fixed to the front end of the housing and of the housing. A translucent cover portion of an underwater strobe device that is formed to bulge outward and is configured to cover the front of the light emitting portion in a watertight state.
The cross-sectional shape is formed in an arc shape as a whole, and
The inner peripheral surface portion is formed in an arc shape having a curvature forming a part of a circle having a diameter dimension that is equal to or less than the maximum dimension of the annular mounting portion of the translucent cover portion in the direction orthogonal to the light emitting axis of the light emitting portion.
It is characterized in that the angle formed by the inner peripheral tangent line of the translucent cover portion and the flash of light emitted from the light emitting portion and traveling through the air layer in the floodlight cover portion approaches 90 degrees . Translucent cover for underwater strobe device. The underwater according to claim 1 or 2, wherein the translucent cover portion has an inner peripheral surface prism portion formed of a plurality of irregularities formed on the inner peripheral surface portion of the translucent cover portion. Translucent cover for strobe device. The translucent cover portion of the underwater strobe device according to claim 3, wherein the inner peripheral prism portion has a honeycomb structure in which hexagonal concave portions or convex portions are arranged in a grid pattern. An underwater strobe device provided with the translucent cover portion according to any one of claims 1 to 4.
A separation prism portion having a prism plate fixed to the front end portion of the housing and changing the course of the flash of the light emitting portion and a prism support leg that supports the prism plate in a state of being separated from the front end portion of the housing is provided. An underwater strobe device featuring. An underwater strobe device provided with the translucent cover portion according to any one of claims 1 to 4.
The translucent cover portion is arranged outside the translucent cover portion and protrudes in the irradiation direction of the flash so as to partially block the diffusion of the flash emitted from the light emitting portion and transmitted through the translucent cover portion. An underwater strobe device including a hood portion that is rotatably provided in the outer peripheral direction.

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