JP2005043688A - Variable irradiation angle strobe apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable radiation angle strobe apparatus, which can improve insufficient distribution of light in the peripheral part of the irradiation area in a wide-side condition. <P>SOLUTION: A diffusion control part consisting of a concave cylindrical lens having a light diffusion function only with respect to the longitudinal direction of a flash discharge tube or only with respect to the direction perpendicular to the longitudinal direction of the flash discharge tube is provided on one surface of a light control member. A first light concentration control part consisting of a convex lens having a light concentration function for concentrating the light only with respect to the direction perpendicular to the longitudinal direction of the flash discharge tube is provided to the central area of the other side, and a second light concentration control part consisting of an annular lens having a light concentration function for concentrating the light with respect to all directions is provided to another area of the other side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an irradiation angle variable strobe device that can vary the emission angle of light emission during wide-angle shooting and telephoto shooting, and more particularly to an irradiation angle variable strobe device that can prevent uneven light distribution that tends to occur during wide-angle shooting. Is.

  Conventionally, the irradiation angle of the emitted light emitted from the light emitting unit composed of a flash discharge tube as a light source, a reflector and a Fresnel lens as a light control member is controlled according to the focal length of the photographing lens used for photographing. Various so-called irradiation angle variable strobe devices configured as described above have been put into practical use or have been proposed.

  As for a conventional illumination angle variable strobe device, there is an apparatus that changes an illumination angle by moving a light control member arranged on the front surface of a reflector in a direction of contacting or separating the reflector (Patent Document 1). Or, conversely, there is also one in which the light control member is fixed and the irradiation angle is changed by moving the reflector in the direction of contacting and separating the reflector (Patent Document 2).

  In addition, there is also one that changes the irradiation angle by moving the flash discharge tube in the reflector (moving in the direction of contact with and away from the bottom of the reflector) and changing the positional relationship of the flash discharge tube with respect to the reflector. (Patent Document 3).

  However, in the case of the former method, since the irradiation angle is changed by moving the light control member or the reflector, there is a problem that a space for moving the light control member or the reflector is necessary and size reduction is restricted. On the other hand, in the case of the latter method, since the irradiation angle was changed by changing the positional relationship between the flash discharge tube and the reflector, the amount of movement of the flash discharge tube was limited by the size of the reflector, and the change in the irradiation angle There is a problem that there are few (especially the longitudinal direction of a flash discharge tube decreases). In order to solve these problems, there has been proposed one in which the light control member is moved toward and away from the reflector and the flash discharge tube is moved in the reflector to change the irradiation angle (Patent Literature). 4).

By the way, when these conventional illumination angle variable strobe devices are actually photographed by reducing the shape of the light emitting portion, thin lines of various colors (on the longitudinal end portion of the flash discharge tube as uneven light distribution ( So-called “rainbow spot”) may occur. Therefore, in order to prevent this, the applicant of the present invention is formed on the surface facing the flash discharge tube in a direction that coincides with the longitudinal direction of the flash discharge tube and is perpendicular to the longitudinal direction of the flash discharge tube. A concave cylindrical lens having a light diffusing action, having at least one apex on the other surface, and collecting light supplied from a flash discharge tube directly or via a reflector in all directions. A first light control member comprising an annular lens formed by connecting a plurality of curved lens surfaces concentrically with a lens curved surface having a light action by a wall surface portion; and the annular lens; An irradiation angle variable strobe device is proposed that includes a second light control member having a concave cylindrical lens formed in a direction orthogonal to the concave cylindrical lens on one opposing surface (Patent Document 5).
Japanese Utility Model Publication No. 53-62330 Japanese Unexamined Patent Publication No. 60-83921 Japanese Examined Patent Publication No. 62-51453 JP-A-2-291538 Japanese Patent Laid-Open No. 10-39377

  However, when the configuration in which the distance between the flash discharge tube and the light control member in the wide-side state is close like the irradiation angle variable strobe device of Patent Document 4, the irradiation angle in the wide-side state can be widened, Insufficient light distribution in the periphery of the irradiation area cannot be denied.

  The present invention has been made in consideration of the above disadvantages, and an object of the present invention is to provide an irradiation angle variable strobe device that can improve insufficient light distribution in the periphery of the irradiation region in the wide-side state. To do.

  An irradiation angle variable strobe device according to the present invention is made to solve the above problems, and includes a flash discharge tube inserted in a reflector and a light control member arranged in front of the reflector, An irradiation angle variable strobe device that varies an irradiation angle by changing a relative distance between a flash discharge tube and a light control member, wherein the light control member is arranged only in the longitudinal direction of the flash discharge tube or A diffusion control unit comprising a concave cylindrical lens having a light diffusing action only in the direction perpendicular to the longitudinal direction of the flash discharge tube is provided, and in the central region of the other surface, in the direction perpendicular to the longitudinal direction of the flash discharge tube A first condensing control unit composed of a convex lens having a condensing function for condensing only, and an annular lens having a condensing function for condensing in all directions on the other area of the other surface. Equipped with a second condensing control unit Characterized in that it comprises Te.

  According to the irradiation angle variable strobe device having the above-described configuration, when the flash discharge tube and the light control member come close to each other (in the wide side state), the flash discharge tube enters the light control member and enters the first light control member. Since the light emitted from the light collection control unit is collected by a larger light collection action than the second light collection control unit, the light collection focal point is short. Insufficient light distribution in the periphery of the irradiated area is compensated by the diffused light, and the amount of light in the entire irradiated area can be made uniform. Further, by using an integral lens instead of the Fresnel lens, there is no loss at the connecting surface of the Fresnel lens, and the efficiency is good.

  In addition, the prism action in the light control member can be suppressed and restricted by the action of diffusing the light incident on the light control member in the longitudinal direction of the flash discharge tube or the direction perpendicular to the longitudinal direction by the diffusion control unit. As a result, the occurrence of rainbow unevenness due to the prism action of the light control member is prevented, particularly in the wide-side state when downsizing.

  Further, in the irradiation angle variable strobe device according to the present invention, as described in claim 2, the light control member is in a region that does not cover the opening of the reflector when the light control member and the flash discharge tube approach. A third condensing control unit composed of a condensing lens having a condensing function with respect to the longitudinal direction of the flash discharge tube, and a condensing lens having a condensing function with respect to a direction orthogonal to the longitudinal direction of the flash discharge tube A configuration including the fourth light collection control unit can be employed.

  According to the irradiation angle variable strobe device having the above-described configuration, the third condensing control unit and the fourth condensing control unit have a condensing function, but do not cover the opening of the reflector in the wide side state. Since it is provided in a portion, in other words, a portion where light does not enter from the flash discharge tube, the irradiation angle in the wide state is not affected. That is, the widening of the irradiation angle in the wide side state is not hindered by the third light collection control unit and the fourth light collection control unit.

  However, when the flash discharge tube and the light control member are separated from each other (the tele-side state), light is incident from the flash discharge tube in the portion provided with the third light collection control unit and the fourth light collection control unit. The emitted light emitted to the outside through the third light collection control unit and the fourth light collection control unit is the length of the flash discharge tube by the third light collection control unit and the fourth light collection control unit. Since the light is condensed with respect to the direction and the direction orthogonal thereto, the light condensing degree in the tele-side state is increased.

  As described above, the irradiation angle variable strobe device according to the present invention is provided with the first condensing control unit composed of a convex lens having a condensing function for condensing light only in a direction orthogonal to the longitudinal direction of the flash discharge tube. Therefore, in the wide side state, the light that enters the light control member from the flash discharge tube and exits from the first light collection control unit of the light control member has a larger light collection effect than the second light collection control unit. Because the light is condensed, the focal point is short, and therefore, the condensing becomes diffused light from the focal point, and the diffused light improves the lack of light distribution in the periphery of the irradiated area, and the light quantity in the entire irradiated area is made uniform. Can be

  In addition, in the wide side state when the shape of the light emitting unit is reduced by having the action of diffusing incident light in the longitudinal direction of the flash discharge tube or the direction orthogonal to the longitudinal direction in the wide side state, the diffusion control unit In addition, the generation of rainbow unevenness due to the prism action of the Fresnel lens can be prevented, and the third condensing control unit and the fourth condensing control unit provided in a region where incident light cannot enter in the wide side state is provided on the tele side. By condensing incident light in the longitudinal direction of the flash discharge tube in the state and in a direction perpendicular thereto, the irradiation angle in the wide side state is widened and the condensing degree in the tele side state is increased. Can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the irradiation angle variable strobe device according to the present embodiment includes a flash discharge tube 1, a first reflector 2 having a bottomed shape into which the flash discharge tube 1 is inserted, and the first A second reflector 3 having a frame shape in which one reflector 2 can be inserted, and light control members 4 and 5 disposed on the front surface of the second reflector 3 are provided. The first reflector can be moved in the direction of moving to and away from the light control members 4 and 5 so as to move in and out of the reflector 3, and the flash discharge tube 1 can be moved to and away from the bottom 2a of the first reflector 2. 2 is configured to be movable.

  A concrete implementation of this is shown in FIG. Both ends of the flash discharge tube 1 are held by a rocking body 6. The first reflector 2 is held by the movable body 7. The second reflecting umbrella 3 is held by the housing 8. The housing 8 interpolates the movable body 7 and also serves as a housing as an irradiation angle variable strobe unit. The movable body 7 is slidably attached to a guide 9 provided in the housing 8 and is movable in a direction in which the movable body 7 contacts and separates from the light control members 4 and 5 (not shown, but attached to the front opening of the housing 8). It has become. The movable body 7 and the housing 8 are connected by an elastic body 10 such as a tension spring, and the movable body 7 is normally urged away from the light control members 4 and 5.

  On the other hand, the oscillating body 6 is attached to the movable body 7 so as to be able to oscillate, and includes a bifurcated arm portion that holds both ends of the flash discharge tube 1 while being inserted into the first reflector 2. The oscillating body 6 is disposed such that the center of oscillation and the axis of the flash discharge tube 1 are parallel to each other and the surface including both faces the light control members 4 and 5. Therefore, the flash discharge tube 1 moves in a circular arc when the oscillating body 6 oscillates within a predetermined angle range with respect to the movable body 7, but since the angular range is narrow, the moving direction of the movable body 7 (substantially) This is equivalent to a substantially linear movement along the direction perpendicular to the surfaces of the light control members 4 and 5. The rocking body 6 and the movable body 7 are connected by an elastic body (not shown) such as a coil spring, and the rocking body 6 is normally biased in a direction away from the light control members 4 and 5.

  The housing 8 is a part of the oscillating body 6 (a projecting piece formed on the opposite side of the flash discharge tube 1 across the oscillating center so that the oscillating body 6 oscillates as the movable body 7 moves. 6a) has a guide surface 8a that abuts and is inclined with respect to the moving direction of the movable body 7. The guide surface 8a is an inclined surface that is closer to the center as it approaches the light control members 4 and 5. Therefore, when the movable body 7 moves to the light control members 4 and 5, the flash discharge tube 1 is also reflected by the first reflection. When the movable body 7 moves relative to the umbrella 2 toward the light control members 4 and 5 and moves in a direction away from the light control members 4 and 5, the flash discharge tube 1 is oscillated by the guide surface 8a. 6 is released, and is moved relative to the first reflector 2 in the direction away from the light control members 4 and 5 (that is, the bottom 2a side of the first reflector 2) by the urging of the elastic body. It is like that.

  The housing 8 is provided with driving means 11 for moving the movable body 7. The driving means 11 includes a motor 12 having an output shaft along a direction orthogonal to the moving direction of the movable body 7, and a lever 13 screwed to the output shaft of the motor 12. The lever 13 is slidably attached to a guide 15 provided on a frame 14 for attaching the motor 12 to the housing 8 and is movable in a direction perpendicular to the moving direction of the movable body 7 in a state where the rotation is restricted. ing.

  The lever 13 includes an inclined surface 13 a that is separated from the light control members 4 and 5 as it moves toward the center, and the inclined surface 13 a contacts the back surface of the movable body 7. Accordingly, when the lever 13 moves to the center side by driving the motor 12, the movable body 7 is pushed forward and moved to the light control members 4 and 5, while the lever 13 moves reversely by reverse driving of the motor 12. The movable body 7 is configured to move in a direction away from the light control members 4 and 5 by the bias of the elastic body 10 when the pressing by the lever 13 is released.

  Therefore, according to such a configuration, when the motor 12 is driven to rotate forward from the tele-side state shown in FIG. 5 (a), the lever 13 is lowered to push the movable body 7 toward the light control members 4 and 5, thereby The movable body 7 moves to the light control members 4 and 5 side and enters the second reflector 3. Along with this, a part 6 a of the oscillating body 6 comes into contact with the guide surface 8 a and the oscillating body 6. Oscillates toward the light control members 4 and 5, so that the flash discharge tube 1 moves in a direction away from the bottom 2 a of the first reflector 2 (light control members 4 and 5 side). The tube 1 is in the wide side state closest to the light control members 4 and 5 (FIG. 5B).

  On the other hand, when the motor 12 is driven in reverse rotation from the wide side state shown in FIG. 5B, the lever 13 is raised, and the movable body 7 released from being pressed by the lever 13 is moved from the light control members 4 and 5 by the elastic member. A direction of moving away from the second reflector 3 and moving away from the light control members 4 and 5 by the elastic member when the swinging body 6 released from contact with the guide surface 8a is released. , The flash discharge tube 1 moves in a direction approaching the bottom 2 a of the first reflector 2, and as a result, the flash discharge tube 1 is farthest from the light control members 4, 5. (FIG. 5 (a)).

  The light control members 4 and 5 control the diffusion and collection of light supplied in front of the reflectors 2 and 3, and are arranged in order from the flash discharge tube 1 in front of the reflectors 2 and 3. The first light control member 4 and the second light control member 5 are configured.

  As shown in FIG. 6 (a), the first light control member 11 is a surface facing the flash discharge tube 1 (more precisely, in a direction perpendicular to the longitudinal direction of the flash discharge tube 1 in the left and right end regions). Recessed cylindrical as a diffusion control unit that is formed in a direction that coincides with the longitudinal direction of the flash discharge tube 1 and has a light diffusing action only in the direction orthogonal to the longitudinal direction of the flash discharge tube 1. On the other hand, as shown in FIG. 6 (b), the lens 16 is provided to collect light only in the direction perpendicular to the longitudinal direction of the flash discharge tube 1 in the central region of the other surface (opposite surface of the facing surface). A second light condensing unit that includes a convex lens 17 serving as a first light condensing control unit having a function and has a light condensing function for condensing the supplied light in all directions on another region of the same surface. An annular lens 18 is provided as a control unit.

  As shown in FIG. 6C, the second light control member 5 is a surface facing the flash discharge tube 1 and is orthogonal to the longitudinal direction of the flash discharge tube 1 in the central region and the left and right end regions. A concave cylindrical lens 19 as a diffusion control unit having a light diffusing action only in the longitudinal direction of the flash discharge tube 1 is provided in the middle region of the direction, and is the same surface, of the left and right end regions A third condensing control unit having a condensing action only in a direction orthogonal to the longitudinal direction of the flash discharge tube 1 in a region (four corner regions) excluding an intermediate region in a direction orthogonal to the longitudinal direction of the flash discharge tube 1 On the other hand, as shown in FIG. 6 (d), the light is condensed only in the longitudinal direction of the flash discharge tube 1 on the left and right end regions of the other surface (opposite surface of the facing surface). A condensing lens 21 is provided as a fourth condensing control unit having an action.

  The convex lens 17 is, for example, a single circular arc surface that is stronger than the condensing characteristic of the annular lens 18 and has no curvature in the longitudinal direction of the flash discharge tube 1 and has a predetermined curvature in a direction orthogonal to the longitudinal direction. Is a convex lens. The curvature is set within a radius of 50 mm to ∞.

  The annular lens 18 has two apexes 18a and 18b, and has a condensing function for condensing light supplied from the flash discharge tube 1 directly or via the reflectors 2 and 3 in all directions. A lens curved surface formed by concentrically subdividing a plurality of lens curved surface portions and connected by a wall surface portion, more specifically, the longitudinal center of the flash discharge tube 1 is orthogonal to the same direction. It is provided symmetrically about the center line that crosses.

  The condensing lens 20 has a curved lens surface that is stronger than the condensing characteristic of the annular lens 18 and has a condensing function only in a direction orthogonal to the longitudinal direction of the flash discharge tube 1. The lens is subdivided into a plurality of lens curved surface portions, and a belt lens formed by connecting the plurality of lens curved surface portions with a wall surface portion.

  The condensing lens 21 has a lens curved surface that is stronger than the condensing characteristic of the annular lens 18 and has a condensing function only in the longitudinal direction of the flash discharge tube 1, for example, in a direction orthogonal to the longitudinal direction of the flash discharge tube 1. The lens is subdivided into a plurality of lens curved surface portions, and a belt lens formed by connecting the plurality of lens curved surface portions with a wall surface portion.

  The irradiation angle variable strobe device according to the present embodiment has the above-described configuration. In the wide-side state, the light supplied from the flash discharge tube 1 to the light control members 4 and 5 directly or via the first reflector 2. Is diffused in the direction perpendicular to the longitudinal direction of the flash discharge tube 1 by the first concave cylindrical lens 16 and further collected in the direction perpendicular to the longitudinal direction of the flash discharge tube 1 by the convex lens 17. The light is condensed and condensed in all directions by the annular lens 18, and then diffused in the longitudinal direction of the flash discharge tube 1 by the second concave cylindrical lens 19 and then emitted to the outside. become. However, the condensing degree of the annular lens 18 is set to be low in order to widen the emission irradiation angle in the wide side state.

  On the other hand, in the tele-side state, the light supplied from the flash discharge tube 1 to almost the entire area of the light control members 4 and 5 by direct light or reflected light is elongated by the first concave cylindrical lens 16. Is diffused in the direction orthogonal to the direction, further emitted from the convex lens 17 and the annular lens 18, and then diffused in the longitudinal direction of the flash discharge tube 1 by the second concave cylindrical lens 19 and collected. The light lens 20 collects light in the direction perpendicular to the longitudinal direction of the flash discharge tube 1 and the light collection lens 21 collects light in the direction orthogonal to the longitudinal direction of the flash discharge tube 1.

  Therefore, according to the irradiation angle variable strobe device according to the present embodiment, the direct light and the reflected light of the flash discharge tube 1 enter the light control members 4 and 5 in the wide-side state, and the light control members 4 and 5 Since the light emitted from the convex lens 17 is condensed by a condensing action larger than that of the annular lens 18, the condensing focal point is short (see FIG. 7). Thus, the diffused light compensates for insufficient light distribution in the periphery of the irradiation region, and the light amount of the entire irradiation region can be made uniform (results are shown in FIGS. 8 to 11).

  Moreover, the prism action in the light control members 4 and 5 is suppressed / restricted by the action of diffusing the light incident on the light control members 4 and 5 in the direction perpendicular to the longitudinal direction of the flash discharge tube 1 by the concave cylindrical lens 16. As a result, the occurrence of rainbow unevenness due to the prism action of the light control members 4 and 5 is prevented, particularly in the wide-side state when downsized.

  The condensing lenses 20 and 21 have a condensing function, but do not cover the opening of the first reflector 2 in the wide-side state, in other words, light does not enter from the flash discharge tube 1. Since it is provided in the portion, the irradiation angle in the wide state is not affected. That is, the converging lenses 20 and 21 do not hinder the widening of the irradiation angle in the wide side state.

  However, in the portion where the condensing lenses 20 and 21 are provided, when the flash discharge tube 1 and the light control members 4 and 5 are separated from each other (tele-side state), light enters from the flash discharge tube 1. The emitted light emitted to the outside through the condensing lenses 20 and 21 is condensed by the condensing lenses 20 and 21 in the longitudinal direction of the flash discharge tube 1 and the direction perpendicular thereto. The degree of light collection in the tele-side state can be increased.

  Further, since the light control member is formed separately from the two light control members 4 and 5, in addition to suppressing the prism action, the light control member is emitted to the outside through the light control members 4 and 5. Of the light distribution characteristics, the light distribution characteristics in the direction perpendicular to the longitudinal direction of the flash discharge tube 1 can be controlled smoothly, thereby reducing the possibility of uneven light distribution in the same direction during actual shooting. You can also

  Further, since the annular lens 18 having two vertices 18a and 18b is configured, a wider light emission angle can be set in wide-angle shooting than in the annular lens having one vertex. become.

  Further, the condensing lens 20 is formed by removing an intermediate region in a direction orthogonal to the longitudinal direction of the flash discharge tube 1, which is originally in the middle of the direction orthogonal to the longitudinal direction of the flash discharge tube 1. In the region, that is, the region close to the flash discharge tube 1, the incident angle of light is small (that is, the light is incident on the light control members 4 and 5 in a substantially orthogonal state), so there is no necessity of intentionally collecting light. is there. And since the concave cylindrical lens 19 is extended in this area | region, the effect of preventing the rainbow nonuniformity which may generate | occur | produce also in a tele side state becomes high by progressing miniaturization of the shape of a light emission part.

  However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

  In the said embodiment, the light control members 4 and 5 are two, and the 1st condensing control part 17 and the 2nd condensing control part 18 are the reflecting umbrellas of the light control member 4 of the side close | similar to the reflecting umbrellas 2 and 3. 2 and 3, the diffusion control unit 19 and the third light collection control unit 20 are opposed to the reflecting umbrellas 2 and 3 of the light control member 5 on the side far from the reflecting umbrellas 2 and 3. The fourth light collection control unit 21 is provided on the surface opposite to the surface facing the reflectors 2 and 3 of the light control member 5, but these combinations are examples, and other It may be a combination.

  Further, there is no need for the two light control members 4 and 5, and one light control member 4 and 5 may be used. When there is one light control member 4, the diffusion control unit having a light diffusion action only in the longitudinal direction of the flash discharge tube 1 and the fourth light collection control unit are opposed to the reflectors 2 and 3 of the light control member 4. A mode in which the first to third light collection control units are provided on the opposite surface is provided.

  Moreover, in the said embodiment, although the opening part by the side of the light control members 4 and 5 is provided with the 2nd reflector 3 which is the shape expanded more than the opening part on the opposite side, this is not essential. . However, in the tele side state, it is possible to prevent a part of the light emitted from the first reflector 2 from leaking to the outside without passing through the light control members 4 and 5, and thus reducing the total amount of irradiation light. It is better to provide two reflecting umbrellas 3.

1 is a schematic exploded perspective view of a variable irradiation angle strobe device according to the present embodiment. FIG. 1 is a schematic configuration of an irradiation angle variable strobe device according to the embodiment; (a) a side view in a telephoto state (b) a side view in an intermediate state Disassembled perspective view of the irradiation angle variable strobe device of the same embodiment Assembly perspective view of the irradiation angle variable strobe device of the same embodiment The irradiation angle variable strobe device according to the embodiment, wherein (a) a sectional side view in a tele side state (b) a sectional side view in a wide side state It is a light control member of the embodiment, (a) a diagram showing a surface of the first light control member facing the reflector (b) a diagram showing the opposite surface (c) a (b) of the second control member (D) Front view of the opposite surface Optical path explanatory diagram in the wide-side state of the variable illumination angle strobe device of the same embodiment Light distribution characteristic diagram in the vertical center line of the same embodiment Light distribution characteristic diagram in the horizontal center line of the same embodiment Light distribution characteristic diagram in the right diagonal line of the same embodiment Light distribution characteristic diagram in the left diagonal line of the same embodiment

Explanation of symbols

1 Flash discharge tube 2 First reflector (reflector)
3 Second reflector (reflector)
4 Light Control Member 5 Light Control Member 16 Concave Cylindrical Lens (Diffusion Control Unit)
17 Convex lens (first condensing control unit)
18 Annular lens (second condensing control unit)
19 Concave cylindrical lens (diffusion controller)
20 Condensing lens (third condensing control unit)
21 Condensing lens (fourth condensing control unit)

Claims (2)

An irradiation angle variable that includes a flash discharge tube inserted in the reflector and a light control member disposed in front of the reflector, and changes an irradiation angle by changing a relative distance between the flash discharge tube and the light control member. In the strobe device, the light control member is formed of a concave cylindrical lens having a light diffusing action only on the longitudinal direction of the flash discharge tube or on the direction orthogonal to the longitudinal direction of the flash discharge tube. A diffusion control unit, a first condensing control unit comprising a convex lens having a condensing function for condensing light only in a direction perpendicular to the longitudinal direction of the flash discharge tube in a central region of the other surface; and An irradiation angle variable strobe device comprising a second condensing control unit composed of an annular lens having a condensing function for condensing light in all directions in another region of the other surface. The light control member comprises a condensing lens having a condensing function in the longitudinal direction of the flash discharge tube in a region not covering the opening of the reflector when the light control member and the flash discharge tube approach each other. 2. The third condensing control unit and a fourth condensing control unit comprising a condensing lens having a condensing function with respect to a direction orthogonal to the longitudinal direction of the flash discharge tube. Stroboscope with variable illumination angle.

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