JP3397894B2 - Flash discharge device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash discharge device, and more particularly to a flash discharge device for condensing a luminous flux generated by a flash discharge tube and irradiating a subject.

[0002]

2. Description of the Related Art Conventionally, a so-called flash discharge device, that is, a so-called flash discharge device, has been generally put into practical use, which is an artificial light source for photography using electron flash by a xenon (Xe) discharge tube or the like. For example, in FIG.
Shows an example of a conventional flash discharge device,
It is a principal part longitudinal cross-sectional view which shows the upper half part of this flash discharge device.

As shown in FIG. 9, one example of this flash discharge device is xenon (X
e) A discharge tube 101 and a reflector 102 arranged behind the xenon discharge tube 101 so as to cover the discharge tube 101, and the luminous flux emitted from the xenon discharge tube 101 is reflected by the reflector 102. By being reflected, the light flux generated from the xenon discharge tube 101 is focused in one direction on the front side of the reflector 102, that is, on the subject side.

The light collecting property can be set by arbitrarily changing the shape of the reflector 102. That is, depending on the shape of the reflector 102,
The luminous flux emitted from the xenon discharge tube 101 can be set so as to be condensed within the photographing angle of view covered by the photographing lens used for photographing, but in this example, Most of the luminous flux emitted from the xenon discharge tube 101 is projected outside the photographing field angle of the photographing lens, so that the light collection efficiency is not so good.

Therefore, by devising the shape of the reflector 102, the luminous flux emitted from the xenon discharge tube 101 is efficiently condensed and the amount of effective reflected light of the reflector 102 is increased. Has been proposed and put to practical use.

For example, the stroboscopic flash device disclosed in Japanese Utility Model Publication No. 47-1568 has a Fresnel lens-like shape on its side surface so as to be substantially orthogonal to the longitudinal direction of the xenon discharge tube arranged behind the reflector. The required number of louver barrier ribs, each having a reflecting mirror surface made of gold or a gold metal film such as gold alumite, are formed on the surface of the unevenness and the surface of the unevenness, whereby the light flux emitted from the xenon discharge tube is condensed. In addition to the efficient use of the reflector, the louver partition wall having the reflecting mirror surface increases the amount of effective reflected light of the reflector.

On the other hand, as shown in another example of the conventional flash discharge device of FIG. 10, a single convex lens condenser lens 103A is arranged in front of a cylindrical xenon discharge tube 101A and a reflector 102A. A light flux emitted from the xenon discharge tube is reflected forward by the reflector 102A, and the light flux is condensed by the condenser lens 103A within the photographing angle of view of the photographing lens. ing.

FIG. 10 (A) is a vertical sectional view of another example of the conventional flash discharge device described above, and FIG. 10 (B) is a horizontal sectional view thereof. As shown in FIG. 10 (A), by disposing the condenser lens 103A in front of the xenon discharge tube 101A, the light flux vertically emitted from the xenon discharge tube 101A is captured by a camera. It is designed to efficiently collect light within the shooting angle of view of the lens.

Further, it is proposed and put into practical use that the shape of the condenser lens 103A is devised so that the light flux emitted from the xenon discharge tube 101A is efficiently condensed within the photographing field angle. Has been done. For example, Japanese Patent Laid-Open No. 1-23
The stroboscopic flash device disclosed in Japanese Patent No. 5931 has a cylindrical convex Fresnel lens surface on one of the front and back sides of the condenser lens, and a concentric convex Fresnel lens surface on the other side. Is arranged in front of the xenon discharge tube and the reflector.

On the other hand, FIG. 11 shows another example of a conventional flash discharge device. In this flash discharge device, a single condenser lens is moved in the front-back direction with respect to the optical axis in conjunction with the change in the shooting angle of view that is changed by the zoom lens of the camera with a zoom lens. The light collecting property of the luminous flux emitted from the xenon discharge tube is changed.

FIG. 11 is a diagram showing another example of a conventional flash discharge device in a camera with a zoom lens,
(A) is a vertical cross-sectional view showing the state on the wide-angle (WIDE: wide) side, and (B) is a vertical cross-sectional view showing the state on the telephoto (TELE: tele) side. As shown in FIGS. 11A and 11B, the flash discharge device shown in the above another example includes a xenon discharge tube 101B, a reflector 102B, and a condenser lens 103B formed by a single convex lens. The condensing property of the flash discharge device is changed by moving the condensing lens 103B along the optical axis direction according to the change of the photographing field angle of the photographing lens (zoom lens) of the camera. It was done like this.

[0012]

However, in another example of the above-mentioned conventional flash discharge device, as shown in FIG. 10 (B), the luminous flux emitted from the xenon discharge tube 101A in the left-right direction is as follows. The light cannot be effectively condensed, and a large amount of light flux is emitted outside the shooting angle of view of the shooting lens. Further, unless the condensing lens 103A itself is large, the condensing effect is small, and the condensing lens 103A must be arranged at a position apart from the xenon discharge tube 101A and the reflector 102A to some extent. However, there is a problem that the condensing effect does not appear remarkably.

That is, as shown in FIG.
Regarding the light flux emitted in the vertical direction of the xenon discharge tube 101A, the light source of the xenon discharge tube 101A serves as a point light source from the condenser lens 103A, so that the light is efficiently condensed. This is because the luminous flux emitted in the left-right direction of the xenon discharge tube 101A does not serve as a point light source, so that efficient focusing is not performed.

Therefore, in a device as another example of the conventional flash discharge device described above, a xenon discharge tube 101A is provided.
In order to efficiently collect the light flux radiated in the left-right direction, a large condenser lens is applied, and this large condenser lens is provided in front of the xenon discharge tube 101A with a sufficient space. There is a problem in that it is necessary to place the device in place, and the flash discharge device cannot be increased in size.

Further, according to the means disclosed in Japanese Utility Model Publication No. 47-1568, it is not possible to provide a large number of louver partitions, so that the luminous flux emitted in the longitudinal direction of the xenon discharge tube is condensed. Regarding sex, there is a problem that it cannot be performed very efficiently.

On the other hand, according to the means disclosed in Japanese Patent Laid-Open No. 1-235931, the luminous flux emitted in the longitudinal direction from the vicinity of the central portion of the xenon discharge tube is sufficiently condensed, but xenon is used. The luminous flux emitted from the end part of the discharge tube has a problem that the condensing property is not sufficient. In order to sufficiently collect the luminous flux emitted from the end part of the xenon discharge tube, It is necessary to increase the size of the lens, which causes a problem of increasing the size of the flash discharge device.

On the other hand, according to another example of the conventional flashlight discharge device interlocked with the zoom lens as shown in FIG. 11, the condensing lens 1 is used to change the condensing characteristic.
Since the moving distance of 03B must be increased, there is a problem that it is difficult to perfectly link the light-collecting property of the flash discharge device to a taking lens having a large zoom ratio, and There is a problem that the size of the apparatus itself increases according to the amount of movement of the lens.

An object of the present invention is to solve the above-mentioned conventional problems, to more efficiently collect a luminous flux generated from a flash discharge tube (xenon discharge tube) and irradiate it within a photographing angle of view, and at the same time, an apparatus. It is to provide a flash discharge device that contributes to miniaturization of itself.

[0019]

A first flash discharge device according to the present invention is a flash discharge device, wherein the flash discharge tube and one of the luminous fluxes generated by the flash discharge tube are arranged behind the flash discharge tube. A reflecting means for reflecting the light-emitting portion, and an axial direction of the flash discharge tube arranged in front of the flash discharge tube so as to collect the light flux generated from the flash discharge tube and the light flux reflected by the reflecting means. And a light refraction means having a shape in which a single convex lens is arranged in the radial direction of the flash discharge tube.
The size of the convex lens in the radial direction of the flash discharge tube is Dv, the distance from the center of the flash discharge tube to the principal point of the convex lens is L, and the half angle of the irradiation angle determined by the flash discharge tube and the reflecting means is θv, the condition of Dv = 2 × L × tan θv is satisfied, the size of the convex lens in the axial direction of the flash discharge tube is Dh, and the flash discharge emitted from the flash discharge tube to the convex lens is When the half angle of the radiation angle of the light flux in the axial direction of the tube is θh, the condition of Dh = 2 × L × tan θh is satisfied, and further, in the axial direction of the flash discharge tube,
The number of convex lenses is n, and the number is in the axial direction of the flash discharge tube.
The length of the light emitting part is Lw, and the light in the radial direction of the flash discharge tube is
Concentration of the axial luminous flux with respect to the bundle with an aperture ratio
It is characterized by satisfying the following conditions : n = Lw / (k × Dv) k <1, Dh <Dv

A second flash discharge device according to the present invention
Is a flash discharge device and the flash discharge device described above.
The luminous flux generated by the flash discharge tube is placed behind the electric tube.
In front of the flash discharge tube, a reflection means for reflecting a part
The light beam generated from the flash discharge tube and
In order to collect the light flux reflected by the reflection means, the flash
A shape with multiple convex lenses arranged in a row in the axial direction of the photodischarge tube
And has a single convex lens in the radial direction of the flash discharge tube.
And a light refraction means having a curved shape.
Let Dv be the size of the convex lens in the radial direction of the tube.
Distance from the center of the flash discharge tube to the main point of the convex lens
Distance L, irradiation determined by the flash discharge tube and the reflection means
When the half-angle of the angle is θv, the condition of Dv = 2 × L × tan θv is satisfied, and the above in the axial direction of the flash discharge tube is satisfied.
The size of the convex lens is Dh, and the convex lens is
Light emitted toward the lens in the axial direction of the flash discharge tube.
When the half angle of the radiation angle of the bundle is θh, the condition of Dh = 2 × L × tan θh is satisfied, and further in the radial direction of the flash discharge tube.
The radius of curvature of the convex lens in the above is R1, and the flash discharge tube is
Let R2 be the radius of curvature of the convex lens in the axial direction of
When R1 <R2 is satisfied, the radial direction of the flash arc tube of each convex lens is satisfied.
The feature is that the light collecting property in the direction is made higher than the light collecting property in the axial direction.
And Further, the third flash discharge device according to the present invention is
In a flash discharge device, a flash discharge tube and the above flash discharge tube
It is placed in front of, and with respect to the radial direction of this flash discharge tube.
Has a single convex lens shape and is in the axial direction of the above flash discharge tube.
Is formed by arranging multiple convex lenses in a row.
Light refraction means and light flux in the width direction that has entered the light refraction means
And a multi-prism that totally reflects a part of
Is characterized by.

[0021]

[0022]

[0023]

[0024]

[0025]

The present invention will be described below with reference to the illustrated embodiments. 1A and 1B are views showing a flash discharge device according to a first embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is a lateral sectional view. As shown in FIGS. 1 (A) and 1 (B), the flash discharge device of the first embodiment is a cylindrical flash discharge means or a flash discharge tube for converting electric energy accumulated in a capacitor into optical energy. A xenon (Xe) discharge tube 1 and a reflecting umbrella 2 which is arranged behind the xenon discharge tube 1 so as to cover the xenon (Xe) discharge tube 1 and which is a reflecting means for reflecting a part of a light beam generated from the xenon discharge tube 1. Is arranged in front of the xenon discharge tube 1, and a plurality of light beams are generated in the axial direction of the xenon discharge tube 1 so as to collect the light beam generated from the xenon discharge tube 1 and the light beam reflected by the reflector 2. The multi-lens 4 is a condensing lens having a shape in which convex lenses are arranged in a row, a condensing means, and a light refracting means.

The reflector 2 reflects the luminous flux emitted from the xenon discharge tube 1 in a desired direction, that is, in the direction in which the multilens 4 provided in front of the xenon discharge tube 1 is arranged. It is shaped like Then, the light flux reflected by the reflector 2 and incident on the multi-lens 4 is refracted in the multi-lens 4 and is set so as to be condensed within a photographing field angle of a photographing lens (not shown) of the camera. Has been done.

FIG. 2 is an enlarged view of the main part of the multi-lens 4, which is a top view (A) of the multi-lens 4,
It is a (B) front view and a (C) side view.

As shown in FIG. 2, the multilens 4 as the light refracting means has a single convex lens shape in the radial direction of the xenon discharge tube 1 (see FIGS. 1A and 2A).
(See (C)) Further, a plurality of convex lenses are arranged in a line in the axial direction of the xenon discharge tube 1 (see FIGS. 1B and 2A and 2B). .

Here, the size of the multi-lens 4 is set as follows. That is, FIG.
As shown in (A), the vertical height Dv of the multi-lens 4 is the distance L from the center of the xenon discharge tube 1 to the principal point of the multi-lens 4, and the xenon discharge tube 1 and the reflection Letting θv be an irradiation angle θv determined by the umbrella 2, that is, an angle that is ½ of the emission angle of the light beam vertically emitted from the xenon discharge tube 1 is given by the following equation (1).

Dv = 2 × L × tan θv (1) Therefore, as shown in the above equation (1), the xenon discharge tube 1
By decreasing the distance L from the center of the multi-lens 4 to the principal point of the multi-lens 4, the vertical height dimension Dv of the multi-lens 4 can also be set small, but there are problems in processing and the xenon discharge tube 1. The problem that the multi-lens 4 is melted by the heat generated (heat resistance),
The optimum value is determined by using the above equation (1) in consideration of the light collection efficiency of the luminous flux emitted from the xenon discharge tube 1.

Further, as shown in FIG. 1B, the widthwise dimension Dh of each condenser lens of the multi-lens 4 is as follows.
The distance L from the center of the xenon discharge tube 1 to the principal point of the multi-lens 4 is defined as an irradiation angle θh determined by the individual condenser lenses of the xenon discharge tube 1 and the multi-lens 4.
That is, if the angle of one half of the emission angle of the luminous flux emitted from the xenon discharge tube 1 to each condenser lens of the multi-lens 4 in the longitudinal direction is θh, the following (2)
Calculated by the formula.

Dh = 2 × L × tan θh (2) Therefore, from the above equations (1) and (2), the irradiation angles θv and θh
It is possible to condense a larger amount of light flux by increasing both of them. However, by increasing the irradiation angle θv, for example, there is a problem of space, and the irradiation angle θh is increased. Therefore, for example, problems such as interference between adjacent condensing lenses of the multi-lens 4 occur. Therefore, after taking these problems into consideration, the optimum values are obtained by using the above equations (1) and (2). Is determined.

As described above, according to the first embodiment, by arranging the multi-lens 4 in front of the xenon discharge tube 1, an example of a conventional flash discharge device (see FIG. 1).
0, see FIG. 11), the light flux generated from the xenon discharge tube 1 can be condensed more efficiently, and
Since the multi-lens 4 has a shape in which a plurality of convex lenses are arranged in a line in the axial direction of the xenon discharge tube 1, a light beam emitted outside the photographing view angle can be refracted and condensed within the photographing view angle. This enables the xenon discharge tube 1
It is possible to set a small interval between and the multi-lens 4. This can contribute to miniaturization of the flash discharge device itself.

3A and 3B are views showing a flash discharge device according to a second embodiment of the present invention. FIG. 3A is a vertical sectional view and FIG. 3B is a horizontal sectional view. In the second embodiment, the flash discharge device of the first embodiment described above is further downsized, and the basic structure is the same as that of the first embodiment.

That is, as shown in FIG. 3, in the flash discharge device of the second embodiment, a xenon discharge tube 1A which is a cylindrical flash discharge tube and a xenon discharge tube 1A which covers the xenon discharge tube 1A. A reflector 2A which is arranged at the rear and is a reflection means for reflecting a part of the light flux generated from the xenon discharge tube 1A, and a reflector 2A arranged in front of the xenon discharge tube 1A and generated from the xenon discharge tube 1A A multi-lens 4A, which is a condenser lens having a shape in which a plurality of convex lenses are arranged in the axial direction of the xenon discharge tube 1A so as to condense the light flux and the light flux reflected by the reflector 2A, which is a light refraction means. It consists of and.

By disposing the multilens 4A closer to the xenon discharge tube 1A side, the distance L between the xenon discharge tube 1A and the multilens 4 is set small. Therefore, the height dimension Dv of the multi-lens 4A and the multi-lens 4
The dimension Dh in the longitudinal direction of each condensing lens is set to a value smaller than that of the flash discharge device of the first embodiment.

In this case, the number n of the individual condenser lenses forming the multi-lens 4 is the length Lw of the light emitting portion of the xenon discharge tube 1, that is, the total length of the xenon discharge tube 1 in the longitudinal direction ( Arc length) Lw, n≈Lw / Dh (3) Substituting equation (2) shown in the first embodiment into this equation (3), n = Lw / 2 × L × tan θh It becomes (4). On the other hand, the number n of the individual condenser lenses forming the multi-lens 4 can also be set by the following equation (5).

N = Lw / k × Dv (5) Here, the above constant k is the ratio of the aperture ratio of the axial luminous flux to the luminous flux emitted vertically from the xenon discharge tube 1. It is a constant of whether light is emitted and usually takes a value of k <1. By substituting the equation (1) shown in the first embodiment into the equation (5), the relational expression (6) is established as follows: n = L / k × 2 × L × tan θv (6) Therefore, the height dimension Dv of the multi-lens 4A and the dimension D in the longitudinal direction of each condenser lens of the multi-lens 4A in the second embodiment.
The relationship with h is Dv> Dh. In this way, the number n of the individual condenser lenses forming the multi-lens 4A in the second embodiment is determined by the equations (4) and (6).

As described above, in the second embodiment described above, the balance of the converging properties of the luminous flux emitted from the xenon discharge tube 1A in the vertical direction and the horizontal direction is determined by the constant k.
It is possible to realize a flashlight discharge device having a more efficient light converging property by performing the setting by arbitrarily adjusting the value of.

Further, the distance between the multi-lens 4A and the xenon discharge tube 1A is set small, and the height dimension Dv and the longitudinal dimension Dh of the individual condenser lenses forming the multi-lens 4A are set small. Increasing the number n can make the flash discharge device more efficient and contribute to downsizing of the entire device.

Next, FIGS. 4 and 5 are views showing a flash discharge device according to a third embodiment of the present invention. In the third embodiment, in a camera with a variable magnification (zoom) lens capable of freely changing a shooting angle of view, a flash discharge device is interlocked with a change in the focal length (shooting angle of view) of the zoom lens. The light-collecting property can be changed, and the basic configuration is the same as that of the flash discharge devices of the above-described first and second embodiments.

In FIG. 4, the multi-lens 4B has a wide angle (WID
E: Wide) shows the state when moving to
(A) is a longitudinal sectional view, and (B) is a transverse sectional view. In addition, FIG. 5 shows that the multi-lens 4B has a telephoto (TE
It shows the state when moving to the (LE: Tele) side,
(A) is a longitudinal sectional view, and (B) is a transverse sectional view.

As shown in FIGS. 4 and 5, also in the flash discharge device of the third embodiment, as in the flash discharge devices of the first and second embodiments, a flash discharge tube having a cylindrical shape is used. A certain xenon discharge tube 1B, and a reflecting umbrella 2B which is disposed behind the xenon discharge tube 1B so as to cover the xenon discharge tube 1B and which is a reflecting means for reflecting a part of a light beam generated from the xenon discharge tube 1B. A plurality of convex lenses are arranged in the axial direction of the xenon discharge tube 1B so as to condense the light flux generated from the xenon discharge tube 1B and the light flux reflected by the reflector 2B. It is composed of a multi-lens 4B which is a condenser lens having an arrayed shape and is a light refracting means.

In the flash discharge device of the third embodiment, the flash discharge device 1B is arranged in front of the xenon discharge tube 1B in association with the change of the photographing angle of view of a zoom lens (not shown) which is a photographing lens of the camera. The multi-lens 4B
By changing the distance in the front-back direction with respect to the optical axis by changing means (not shown), the distance between the multi-lens 4B, which is the light collecting means, and the xenon discharge tube 1B, which is the flash discharge tube, can be changed. The irradiation angle of the luminous flux emitted from the xenon discharge tube 1B is changed according to the photographing field angle of the photographing lens.

According to the third embodiment thus constructed, the multi-lens 4 is provided in front of the xenon discharge tube 1B.
B is arranged so that the light flux emitted from the xenon discharge tube 1B is refracted by the multilens 4B so as to be condensed within the photographing angle of view.
The size of each B condenser lens can be reduced. As a result, when a condensing lens including a single convex lens is used as in the conventional flash discharge device (see FIG. 1).
1)), it is possible to reduce the amount of movement of the multi-lens 4B, and even with this small amount of movement, it is possible to obtain a desired irradiation angle according to the angle of view of the zoom lens.

FIG. 6 is an enlarged view of a main part of the multi-lens in the flash discharge device of the fourth embodiment of the present invention.
Shows a top view, (B) shows a front view, and (C) shows a side view. In the multi-lens 4C of the fourth example, the individual condensing lenses of the multi-lens 4C are set to have different radii of curvature in the height direction and the longitudinal direction. That is, as shown in FIG. 6 (A), the radius of curvature R2 in the longitudinal direction of each condensing lens of the multi-lens 4C and each condensing lens of the multi-lens 4C as shown in FIG. 6 (C). The curvature radius R1 in the height direction of the lens is set to satisfy the relationship of R1 <R2.

As a result, when the luminous flux emitted from the xenon discharge tube 1C arranged behind the multi-lens 4C is focused on the multi-lens 4C,
The converging property of the light beam condensed in the vertical direction of each condensing lens of the multi-lens 4C is set so as to be condensed more strongly than the condensing property of the light beam condensed in the longitudinal direction. There is.

This is because the photographing screen of the photographing lens is generally long in normal photography, and in this case, the photographing angle of view of the photographing lens is greater than the angle of view in the width (longitudinal) direction of the screen. Also, since the angle of view in the height (vertical) direction becomes narrower,
This is because the light condensing property of the flash discharge device can also be set so that the light converging property in the height direction is set to be stronger, so that efficient irradiation can be obtained.

As described above, according to the multi-lens 4C of the flash discharge tube of the fourth embodiment, the radius of curvature is set to be different in the height direction and the longitudinal direction of the multi-lens 4C, and the photographed image is set. By setting the light collecting properties to be different depending on the height direction and the width direction of the angle, the light flux emitted from the xenon discharge tube 1C can be more efficiently collected within the photographing field angle.

Regarding the setting of the radius of curvature of the multi-lens 4C, it depends on the direction in which the light flux emitted from the xenon discharge tube 1C is condensed.
The radius of curvature R1 in the height direction of C and the radius of curvature R in the width direction of C
The value of 2 can be changed according to the shooting situation. That is, apart from the above setting, for example, the radius of curvature R1> R2
Since it is easy to set as described above, it is possible to set the light collecting property with a higher degree of freedom.

FIG. 7 is an enlarged view of a main part of a multi-lens in the flash discharge device of the fifth embodiment of the present invention.
Shows a top view, (B) shows a front view, and (C) shows a side view.

As shown in FIG. 7, the multi-lens 4D in the flash discharge device of the fifth embodiment has a shape such as a cylindrical lens for the luminous flux emitted from the xenon discharge tube 1D in the height direction. Portion and b portion collect light, and the above xenon discharge tube 1D
A part of the light beam emitted in the width direction is totally reflected by the c portion and the d portion formed by, for example, a multi-prism.

As shown in FIG. 7C, a complete cylindrical surface is formed in the portion b on the outer side of the multi-lens 4D, and it is arranged behind the multi-lens 4D. The a portion on the side opposite to the formed xenon discharge tube 1D is also configured to form a cylindrical surface with a partly missing shape.

On the other hand, a part of the light flux in the width direction emitted from the xenon discharge tube 1D incident on the c portion and the d portion of the multi-lens 4D is designed to be totally reflected, and within the photographing angle of view. It is supposed to be irradiated.

With this structure, according to the multi-lens 4D in the flash discharge device of the fifth embodiment, the shape of the xenon discharge tube 1D in the height direction of the multi-lens 4D is a cylindrical surface. By
The luminous flux emitted from the xenon discharge tube 1D in the height direction can be efficiently collected, and a part of the luminous flux in the width direction of the multi-lens 4D is totally reflected so as to be within the photographing field angle. Since the irradiation is performed, the light flux emitted from the xenon discharge tube 1D can be condensed more efficiently in the width direction.

FIG. 8 shows a multi-lens in the flash discharge device of the sixth embodiment of the present invention. The flash discharge device of the sixth embodiment of the present invention is interlocked with the change of the photographing angle of view of the zoom lens in the camera with a zoom lens. The light condensing property can be changed according to the photographing angle of view.

FIGS. 8A and 8B are a top view and a side view of the multi-lens 4E in the flash discharge device of the sixth embodiment. FIG. 8A shows a wide-angle (WIDE: wide) state. 8B shows a state at the time of telephoto (TELE: Tele), FIGS. 8C and 8D are vertical sectional views of the multi-lens 4E, and FIG. 8C shows a state of the multi-lens 4E at wide angle. (D) shows the state of the multi-lens 4E at the time of telephoto.

As shown in FIGS. 8A and 8B, this sixth
The multi-lens 4E in the flash discharge device of the embodiment has lens surfaces 4Ea and 4Eb provided substantially perpendicular to the optical axis.
The outer shape portion 4Ec formed of an elastic body, the liquid substance 4Ed that is a shape changing unit that is filled inside the outer shape portion 4Ec and changes the outer shape, and the individual condensing lenses that form the multi-lens 4E. Plastic body 4E that retains its shape
It is composed of e.

Then, by interlocking with the change of the photographing angle of view of the zoom lens, the pressure is adjusted to the liquid substance 4Ed filled from one end of the multi-lens 4E, whereby the lens surfaces 4Ea and 4Eb are adjusted. The radius of curvature can be changed. Thus, the light flux emitted from the xenon discharge tube 1E of the flash discharge device is set by setting the radius of curvature of the lens surface of the multi-lens 4E according to the shooting angle of view in association with the change of the shooting angle of view of the zoom lens. The irradiation angle is changed so that the light is efficiently focused within the shooting angle of view.

With this structure, according to the multi-lens 4E in the flash discharge tube of the sixth embodiment, the multi-lens 4E is interlocked with the change of the photographing field angle by the zoom lens.
By changing the radius of curvature of the lens surfaces 4Ea and 4Eb of the multi-lens 4E, it is possible to change the light-collecting property of the multi-lens 4E. As a result, the luminous flux emitted from the xenon discharge tube 1E can be efficiently emitted to the subject within a desired shooting angle of view according to the change of the shooting angle of view of the zoom lens. At this time, since the irradiation angle can be changed in conjunction with the photographing field angle of the zoom lens without moving the multi-lens 4E in the optical axis direction with respect to the xenon discharge tube, the flash discharge device can be downsized. Can contribute to.

[Supplementary Notes] (1) In the flash discharge device, the flash discharge tube and the flash light discharge tube are disposed in the vicinity of the flash discharge tube and have a single cylindrical lens shape in the radial direction of the flash discharge tube. A flashlight discharger comprising: a plurality of rows of prism-shaped light refracting means arranged in the axial direction of the discharge tube.

(2) In the flash discharge device, a flash discharge tube, a reflecting means arranged behind the flash discharge tube for reflecting a part of a light beam generated by the flash discharge tube, and the flash discharge tube. Is arranged in front of the flash discharge tube, and has a shape in which a plurality of convex lenses are arranged in a row in the axial direction of the flash discharge tube so as to collect the light flux generated from the flash discharge tube and the light flux reflected by the reflecting means. A flash discharge device comprising:

(3) In the flash discharge device described in appendix 2, the plurality of convex lenses have a radial convex lens size of the flash discharge tube determined by an irradiation angle determined by the flash discharge tube and the reflecting means. A flash discharge tube in which the number of convex lenses in the axial direction of the tube is determined in relation to the dimension of the convex lens in the radial direction and the length of the flash discharge tube.

(4) In the flash discharge device described in appendix 2, the size (Dv) of the convex lens in the radial direction of the flash discharge tube is the distance from the center of the flash discharge tube to the principal point of the convex lens. (L) and the irradiation angle (θv) determined by the flash discharge tube and the reflection means, and is determined by the following formula: Dv = 2 × L × tan θv The number of convex lenses in the axial direction (n) is the radial direction. An equation obtained by dividing the length (Lw) of the light emitting portion in the axial direction of the flash discharge tube by a value corresponding to the size (Dv) of the convex lens of n = Lw / (k × Dv) = Lw / (2 × k × L × tan
θv) (k: flash light discharge device determined by (k: constant of how much aperture ratio the axial luminous flux is condensed with respect to the radial luminous flux)).

(5) In the flash discharge device, a xenon flash discharge tube, a reflecting means arranged behind the xenon flash discharge tube for reflecting a part of a light beam generated from the xenon flash discharge tube, and the above A shape in which a plurality of convex lenses are arranged in the axial direction of the xenon flash discharge tube so as to be arranged in front of the xenon flash discharge tube and refract the light flux generated from the xenon flash discharge tube and the light flux reflected by the reflecting means. And a light refracting means having a radius of curvature in the radial direction of the plurality of convex lenses so that the refracting power is different between the radial direction and the axial direction of the xenon flash discharge tube. A flash discharge device smaller than the radius.

(6) In the flash discharge device, a flash discharge tube, and a reflecting means arranged behind the flash discharge tube for reflecting a part of the luminous flux generated from the flash discharge tube,
Condensing means arranged in front of the flash discharge tube and having a shape in which a plurality of convex lenses are arranged in an axial direction so as to collect the light flux generated from the flash discharge tube and the light flux reflected by the reflecting means. And a changing means for changing the distance between the light collecting means and the flash discharge tube in association with a change in the focal length of the photographing lens in order to change the degree of focusing of the light flux.

(7) In the flash discharge device, a flash discharge tube, and a reflecting means arranged behind the flash discharge tube for reflecting a part of a light beam generated from the flash discharge tube,
Condensing means arranged in front of the flash discharge tube and having a shape in which a plurality of convex lenses are arranged in an axial direction so as to collect the light flux generated from the flash discharge tube and the light flux reflected by the reflecting means. And a shape change for changing the outer shape of the plurality of convex lenses in at least one of the radial direction and the axial direction of the flash discharge tube in order to change the degree of light collection by the light collecting means. A flash discharge device comprising:

[0068]

As described above, according to the present invention, by applying a multi-lens which is a light refracting means having a shape in which a plurality of convex lenses are arranged in a row in the axial direction of the flash discharge tube, it is possible to more efficiently It is possible to provide a flash discharge device that collects a light beam generated from a flash discharge tube (xenon discharge tube) and irradiates it within the shooting angle of view without waste, and contributes to downsizing of the device itself.

[Brief description of drawings]

FIG. 1 is a diagram showing a flash discharge device according to a first embodiment of the present invention, in which (A) is a longitudinal sectional view and (B) is a lateral sectional view.

FIG. 2 is an enlarged view of a main part of the multi-lens shown in FIG. 1, showing (A) a top view, (B) a front view, and (C) a side view.

3A and 3B are diagrams showing a flash discharge device according to a second embodiment of the present invention, in which FIG. 3A is a vertical sectional view and FIG. 3B is a horizontal sectional view.

FIG. 4 is a diagram showing a flash discharge device according to a third embodiment of the present invention, in which (A) is a multi-lens wide-angle lens (WIDE:
(B), which is a vertical cross-sectional view showing the state when moved to the (wide) side.
[FIG. 6] is a transverse cross-sectional view showing a state when the multi-lens moves to the wide-angle side.

5 is a diagram showing the flash discharge device of FIG. 4,
(A) is a longitudinal sectional view showing a state when the multi-lens is moved to the telephoto side, and (B) is a transverse sectional view showing a state when the multi-lens is moved to the telephoto side.

FIG. 6 is an enlarged view of a main part of a multi-lens in a flash discharge device according to a fourth embodiment of the present invention, in which (A) is a top view,
(B) is a front view and (C) is a side view.

FIG. 7 is an enlarged view of a main part of a multi-lens in the flash discharge device of the fifth embodiment of the present invention, (A) is a top view,
(B) is a front view and (C) is a side view.

FIG. 8 is a diagram showing a multi-lens in the flash discharge device of the sixth embodiment of the present invention, in which (A) is a wide-angle (WID
(E: Wide) top view and side view of the multi-lens, (B) is a top view and side view of the multi-lens when in telephoto (TELE: Tele), and (C) is a multi-view at wide angle. FIG. 3D is a vertical cross-sectional view showing the state of the lens, and FIG. 4D is a vertical cross-sectional view showing the state of the multi-lens at the time of telephoto.

FIG. 9 is a longitudinal sectional view of an essential part showing an example of a conventional flash discharge device, showing an upper half part.

FIG. 10 shows another example of a conventional flash discharge device, where (A) is a vertical sectional view and (B) is a horizontal sectional view.

FIG. 11 shows another example of a conventional flash discharge device, showing a flash device linked to a camera with a zoom lens, in which (A) is a vertical cross-sectional view showing a wide-angle (WIDE: wide) side state. FIG. 1B is a vertical sectional view showing a state on the telephoto side.

[Explanation of symbols]

1, 1A, 1B, 1C, 1D, 101, 101A, 10
1B ... Xenon (Xe) discharge tube (flash discharge tube, flash discharge means) 2, 2A, 2B, 2E, 102, 102A, 102B ...
... Reflecting umbrella (reflecting means) 4,4A, 4B, 4C, 4D, 4E ... Multi-lens (light refracting means) 103,103A, 103B ... Convex lens (condensing lens)

Claims (3)

(57) [Claims] 1. A flash discharge device comprising: a flash discharge tube; reflecting means arranged behind the flash discharge tube for reflecting a part of a luminous flux generated by the flash discharge tube; A plurality of convex lenses are arranged in the axial direction of the flash discharge tube so as to condense the light flux generated from the flash discharge tube and the light flux reflected by the reflecting means, which are arranged in the front. A light refracting means having a shape in which a single convex lens is arranged in the radial direction of the flash discharge tube, and the size of the convex lens in the radial direction of the flash discharge tube is Dv, from the center of the flash discharge tube When the distance to the principal point of the convex lens is L and the half angle of the irradiation angle determined by the flash discharge tube and the reflection means is θv, the condition of Dv = 2 × L × tan θv is satisfied, and The above convex projection in the axial direction Where Dh = 2 × L × tan θh, where Hh is the half angle of the emission angle of the luminous flux emitted from the flash discharge tube to the convex lens in the axial direction of the flash discharge tube. the filled, further, the number of the convex lens in the axial direction of the flash discharge tube n, Lw the length of the light emitting portion in the axial direction of the flash discharge tube, with respect to the radial direction of the light beam of the flash discharge tube, the axial direction Light of
A flash discharge device characterized by satisfying the respective conditions of n = Lw / (k × Dv) k <1 and Dh <Dv , where k is a constant of the aperture ratio at which the bundle is condensed. . 2. A flash discharge device comprising: a flash discharge tube; reflecting means arranged behind the flash discharge tube for reflecting a part of a luminous flux generated by the flash discharge tube; A plurality of convex lenses are arranged in the axial direction of the flash discharge tube so as to condense the light flux generated from the flash discharge tube and the light flux reflected by the reflecting means, which are arranged in the front. A light refracting means having a shape in which a single convex lens is arranged in the radial direction of the flash discharge tube, and the size of the convex lens in the radial direction of the flash discharge tube is Dv, from the center of the flash discharge tube When the distance to the principal point of the convex lens is L and the half angle of the irradiation angle determined by the flash discharge tube and the reflection means is θv, the condition of Dv = 2 × L × tan θv is satisfied, and The above convex projection in the axial direction Where Dh = 2 × L × tan θh, where Hh is the half angle of the emission angle of the luminous flux emitted from the flash discharge tube to the convex lens in the axial direction of the flash discharge tube. the filled, further, the curvature of the convex lens in the radial direction of the flash discharge tube
The radius is R1, the curvature half of the convex lens in the axial direction of the flash discharge tube.
When the diameter R2, and satisfy the condition of R1 <R2, the radial condenser of the flash light emission tube of the individual convex lenses Jikukata
The flash discharge device is characterized in that
Place 3. A flash discharge device comprising: a flash discharge tube; and a flash lens which is disposed in front of the flash discharge tube and has a single convex lens shape in a radial direction of the flash discharge tube. And a multi-prism that totally reflects a part of the light beam in the width direction incident on the light refracting means, the light refracting means having a shape in which a plurality of convex lenses are arranged in a row in the axial direction. Characteristic flash discharge device.