JPH08262538A - Illumination device - Google Patents

Abstract

PURPOSE: To obtain an illumination device shining divergent light emitted from a light source and a moving quantity thereof is small and a high zooming effect (shining angle change effect) is obtained and it can be formed to be compact. CONSTITUTION: A prism 11 provided with an incident surface 11a which converges the light emitted mainly forward from the light source 10 by using a lens 14 and reflects the light emitted almost backward from the light source 10 mainly forward and on which the light emitted obliquely forward from the light source 10 is made incident, a total reflection surface 11b totally reflecting the light transmitted through the incident surface 11a forward and an emitting surface 11c emitting the light totally reflected on the total reflection surface 11b and a similar prism 12 are arranged so that the inclination thereof with respect to a shining optical axis O can be varied and the lens 14 is interposed from the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device used for a camera or the like, and more particularly to an illuminating device capable of changing an irradiation angle.

[0002]

2. Description of the Related Art A stroboscopic illumination device used for a camera or the like basically comprises a light source and optical members such as a reflecting mirror and a prism for guiding divergent light emitted from the light source to the front side.

In such an illuminating device, when the irradiation angle is far from the angle of view of the camera, the amount of irradiation light at the peripheral portion within the angle of view is insufficient, or, conversely, it is large outside the angle of view. That is, there is a problem that the light utilization efficiency is lowered due to the irradiation of the light.

Therefore, various illumination devices capable of changing the irradiation angle have been proposed in the past. The main ones are (1) As shown in JP-A-4-138439, sideways from a light source. Or a prism having a total reflection surface that reflects the light emitted rearward toward the front side,
And a member for moving the light source in the direction of the irradiation optical axis relative to the reflecting member arranged on the outside thereof, and (2) a reflecting mirror equipped with a light source, as disclosed in JP-A-6-160947. A condensing Fresnel lens having an aperture through which it can pass and another condensing Fresnel lens arranged on the front side of the condensing Fresnel lens and moving the light source and the reflecting mirror in the axial direction of the aperture, that is, the irradiation optical axis direction. , (3) Special Fairness 5-
As disclosed in JP-A-29895, JP-A-6-138522 and JP-B-62-51453,
The thing which changes the inclination of a reflecting mirror etc. is mentioned.

[0005]

However, in the above configuration (1), since the reflecting member is provided outside the prism, there is a problem that the device becomes large and the cost becomes high.

Further, in the above configuration (2), the light source and the reflecting mirror must be largely moved in order to make the irradiation angle variable, and two condenser Fresnel lenses having a large diameter are required. In addition, there is a problem that the size of the device is inevitable.

Further, in the above configuration (3), there is a problem that the degree of freedom in setting the light distribution characteristic is low because there is no means for independently controlling the light that directly goes from the light source to the subject.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an illuminating device which can be formed in a small size and can obtain a high zoom effect (irradiation angle changing effect) with a small moving amount. It is intended.

[0009]

A first illuminating device according to the present invention is a illuminating device which irradiates forward divergent light emitted from a light source as described above, and collects light mainly emitted forward from the light source. A lens that emits light, an incident surface on which light emitted obliquely forward from the light source enters, a total reflection surface that totally reflects the light that has passed through this incident surface to the front side, and a total reflection surface on this total reflection surface. A pair of prisms having an emission surface for emitting the reflected light and having a variable inclination with respect to the irradiation optical axis and sandwiching the lens from the outside, and a light emitted substantially rearward from the light source. It is characterized in that it is equipped with a reflecting mirror that reflects the light forward.

A second illuminating device according to the present invention is an illuminating device having a condenser lens, a pair of prisms, and a reflecting mirror similar to those described above, and a light reflecting member is provided outside each of the pair of prisms. It is characterized in that no member is arranged.

A third illuminator according to the present invention is provided with a condenser lens, a pair of prisms, and a reflecting mirror similar to those described above, and is further linked with a zoom mechanism of a photographing lens of a camera. It is characterized in that a driving member for changing the inclination of the pair of prisms is provided.

[0012]

In each of the illuminating devices of the present invention having the above-described structure, the light mainly emitted from the light source forward is condensed by the lens and always irradiates the central portion of the irradiation angle range. On the other hand, light emitted obliquely forward from the light source passes through the pair of prisms and is emitted forward.
By changing the tilt of this prism with respect to the irradiation optical axis,
The direction of the light emitted from it can be changed.

Therefore, if the inclination of the prism is set so that the light emitted from the prism irradiates the same position as the light emitted from the lens or a position close thereto, when the photographing lens of the camera is on the telephoto side. If the tilt of the prism is set so that the light emitted from the prism will illuminate the outside of the light emitted from the lens, the wide-angle suitable for the wide-angle side of the camera. It becomes the irradiation angle.

Since the light emitted from the light source substantially rearward is reflected by the reflecting mirror and enters the lens or prism, the light-collecting efficiency is kept high. Further, since the total reflection at the prism has a higher reflection efficiency than the reflection at the reflecting mirror, the lighting device of the present invention improves the utilization efficiency of the light emitted from the light source as compared with the lighting device using the conventional reflecting mirror. be able to.

As described above, since the illumination device of the present invention can change the irradiation angle by changing the inclination of the prism with respect to the irradiation optical axis, it is a device that largely moves the light source and the reflecting mirror in the irradiation optical axis direction. Compared with the above, a high zoom effect can be obtained with a small amount of movement, and the size can be reduced.

In the illumination device of the present invention, the light mainly emitted from the light source to the front and the light emitted obliquely to the front are directed in the desired directions by the lens and the prism, respectively, so that the irradiation angle can be efficiently increased. Can be changed.

In the second illuminating device according to the present invention, since the light reflecting member is not arranged outside the prism, a particularly remarkable miniaturization is achieved.

Further, in the third illumination device according to the present invention, since the driving member for changing the inclination of the prism is provided in association with the zoom mechanism of the photographing lens of the camera,
If the zoom operation of the taking lens is performed, the optimum irradiation angle can be automatically obtained accordingly.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1, 2 and 3 show a side view of a strobe lighting device according to a first embodiment of the present invention. The devices themselves shown in these figures are identical to each other.
2 shows a state at a wide irradiation angle, FIG. 2 shows a state at a narrow irradiation angle, and FIG. 3 shows a locus of light emitted from the light source 10 substantially rearward.

This strobe lighting device is provided with a straight tubular light source 10 such as a Xe (xenon) tube and a light source 10 arranged in front of the center of the light source 10 and along the longitudinal direction of the light source 10 (direction perpendicular to the paper surface). A pair of transparent prisms 11 and 12 extending
And a reflector 13 arranged from the rear to the side of the light source 10.
A cylindrical lens 14 extending along the longitudinal direction of the light source 10 and arranged in a state of being sandwiched between the prisms 11 and 12 in front of the light source 10, and the cylindrical lens 14
And a dustproof cover 15 placed in front of the prisms 11 and 12
It consists of and. 16 is a light emission control trigger.

The upper prism 11 has an entrance surface 11a, a total reflection surface 11b, an exit surface 11c, and a rotating shaft 11d extending in the prism longitudinal direction. The cross-sectional shape of the total reflection surface 11b may be an ellipse, an arc, a combination of a plurality of arcs, a plane, or a combination of a plurality of these. Similarly to the upper prism 11, the lower prism 12 also has an entrance surface 12a, a total reflection surface 12b, and an exit surface 12c.
And a rotating shaft 12d extending in the prism longitudinal direction. The reflecting mirror 13 can be formed of an aluminum plate, a mold component which is vapor-deposited with aluminum, or the like. As the cross-sectional shape, an ellipse, a hyperbola, a circular arc, a combination of a plurality of circular arcs, or a combination of a plurality of these can be adopted. The cylindrical lens 14 has an entrance surface 14a, which is a positive refracting surface, and an exit surface 14b.

As shown in FIGS. 1 and 2, the light mainly emitted from the light source 10 to the front enters a cylindrical lens 14, and is condensed by the cylindrical lens 14 in a plane parallel to the paper surface to the front side. It is ejected, passes through the dust-proof cover 15, and illuminates the subject. The light emitted from the light source 10 obliquely to the upper front side is incident on the incident surface 11a of the prism 11, passes through the incident surface 11a, and is totally reflected by the total reflection surface 11b. This total reflection surface
The light totally reflected by 11b is emitted from the emission surface 11c to the front side, and illuminates the subject on the opposite side, that is, the lower side with the irradiation optical axis O interposed therebetween. On the other hand, although not shown in the figure, the light emitted from the light source 10 obliquely to the front lower side is incident on the incident surface 12a of the prism 12, and after passing therethrough, is totally reflected by the total reflection surface 12b. The light totally reflected by the total reflection surface 12b is emitted from the emission surface 12c to the front side, and illuminates the subject on the opposite side, that is, the upper side with the irradiation optical axis O interposed therebetween.

The prisms 11 and 12 are respectively rotatable shafts 11d and
It is rotatable about 12d, and is rotated in conjunction with, for example, the zoom lens of the camera, or manually, and when this zoom lens is set to the wide-angle side, FIG.
When the zoom lens is set to the telephoto side at the rotation position shown in FIG. 2, the zoom lens is set to the rotation position shown in FIG.

FIG. 4 shows the relationship between the light irradiation range on the object plane P by the strobe lighting device and the photographing angle of view by the zoom lens of the camera. In the figure, W indicates the shooting angle of view when the zoom lens is set to the wide-angle side (hereinafter referred to as the wide angle of view), and T indicates the shooting angle of view when the zoom lens is set to the telephoto side ( This is hereinafter referred to as a tele angle of view).

In the state of FIG. 1, the cylindrical lens
The light emitted from 14 is slightly larger than the tele angle of view T in the area 1 in FIG. 4, that is, the direction of changing the irradiation angle (Y direction), and is perpendicular to the direction of changing the irradiation angle (X direction). ), An area slightly larger than the wide angle of view W is irradiated. Further, in the state of FIG. 1, the light emitted from the upper prism 11 is deviated to the area 2 in FIG. 4, that is, to the lower side of the tele view angle T in the Y direction, and the wide view angle W in the X direction. Irradiate a slightly larger area. On the other hand, in the state of FIG. 1, the light emitted from the lower prism 12 is deviated to the upper side of the telescopic field angle T in the region 3 in FIG. 4, that is, in the Y direction, and the wide field angle W in the X direction.
Irradiate a slightly larger area.

As described above, when the zoom lens of the camera is set to the wide-angle side, the light emitted from the prisms 11 and 12 and the cylindrical lens 14 is applied to a region substantially matching the wide angle of view W. Like Figure 5
The outline of the illuminance distribution in the Y direction at this time is shown. Curves 1, 2 and 3 in FIG. 5 show the illuminance distributions in the regions 1, 2 and 3 in FIG. 4, respectively, and the overall illuminance distribution is represented by a dashed line that combines them.

When the zoom lens of the camera is set to the telephoto side, the upper prism 11 is rotated clockwise in FIG. 1 about the rotation shaft 11d, and the lower prism 12 is rotated about the rotation shaft 12d. It is rotated counterclockwise and set to the rotation positions shown in FIG. 2, respectively.

In the state of FIG. 2, the light emitted from the cylindrical lens 14 irradiates the area 1 in FIG. 4 without changing from the state of FIG. Further, the light emitted from the upper prism 11 changes its direction in such a manner that the angle formed with the irradiation optical axis O becomes gradually smaller as the prism 11 rotates, and under the state of FIG. Irradiate almost the same area as the area. Similarly, the light emitted from the lower prism 12 irradiates a region substantially the same as the region 1 in FIG.

As described above, when the zoom lens of the camera is set to the telephoto side, the light emitted from the prisms 11 and 12 and the cylindrical lens 14 substantially coincides with the tele angle of view T in the Y direction. In the X direction, the area that substantially matches the wide field angle W is irradiated, and the illuminance in the irradiation range becomes higher. FIG. 6 shows an outline of the illuminance distribution in the Y direction at this time. Curves 1, 2 and 3 in this FIG.
Shows the illuminance distributions in regions 1, 2 and 3 in FIG. 4, respectively, and the overall illuminance distribution is represented by a dashed line that combines them.

In the embodiment described above, the exit surfaces 11c and 12c of the prisms 11 and 12 and the exit surface 14b of the cylindrical lens 14 are flat, but FIG.
As shown in, it is also possible to form the exit surfaces 11c, 12c and 14b in the form of vertical Fresnel lenses to collect light in the direction perpendicular to the direction in which the irradiation angle is changed.

The end faces of the prisms 11 and 12 facing the cylindrical lens 14 and the end face of the cylindrical lens 14 facing the prisms 11 and 12 are such that the light passing through them is totally reflected. It is preferable to perform mirror finishing.

Further, in this embodiment, as shown in FIG.
Light emitted substantially rearward from 10 is reflected by the reflecting mirror 13 and mainly enters the cylindrical lens 14, so that the light collection efficiency is kept high. However, the present invention is not limited to this, and the light reflected by the reflecting mirror 13 may mainly enter the prisms 11 and 12.

Further, it is possible to arrange the light source 10 so that its longitudinal direction extends vertically and change the irradiation angle in the X direction of FIG.

Next, a second embodiment of the present invention will be described with reference to FIGS. In these figures, the devices themselves are the same, and FIG. 8 shows a state at a wide irradiation angle, FIG. 9 shows a state at a narrow irradiation angle, and FIG. The locus of the emitted light is shown. Further, in these drawings, the same elements as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted unless otherwise necessary (the same applies hereinafter).

The strobe lighting device of the second embodiment uses prisms 21 and 22 different from those of the device of the first embodiment. Also in this case, the upper prism 21 is
21a, a total reflection surface 21b, and an exit surface 21c, the rotating shaft 21d is provided near the front edge of the surface facing the cylindrical lens 14 unlike the case of the first embodiment. ing. Similarly to the upper prism 21, the lower prism 22 has an entrance surface 22a, a total reflection surface 22b, an exit surface 22c, and a rotating shaft 22.
d and.

In these prisms 21 and 22, the inclinations of the total reflection surfaces 21b and 22b are set to be relatively small, so that the vertical dimension y _{p of the} front surface of the prism can be made small.
However, since the irradiation angle becomes too wide in this state, in order to correct this, the emission surfaces 21c and 22c are inclined and the emitted light is refracted so that the angle formed with the optical axis becomes small. Such prisms 21 and 22 are advantageous in downsizing the device.

Next, a third embodiment of the present invention will be described. FIG. 11 shows a side view of a strobe lighting device according to a third embodiment of the present invention. Also in this third embodiment device,
The upper prism 31 has an entrance surface 31a, a total reflection surface 31b, an exit surface 31c, and a rotating shaft 31d. Similarly to the upper prism 31, the lower prism 32 also has an entrance surface 32a, a total reflection surface 32b, an exit surface 32c, and a rotating shaft 32d.

On the other hand, the cylindrical lens 34 is largely extended vertically so that the front ends thereof are located in front of the exit surfaces 31c and 32c of the prisms 31 and 32, respectively. In the above-described first embodiment device, the cylindrical lens 14 and the prism
Since there is a gap between 11 and 12, it is necessary to provide a dustproof cover 15 in order to prevent the entry of dust and the like into this gap (the same applies to the device of the second embodiment). Since the cylindrical lens 34 also functions as a dustproof cover, it is not necessary to separately provide a dustproof cover. If so, the light emitted from the cylindrical lens 34 does not have to pass through a separate dustproof cover, so that the transmission efficiency is improved.

FIGS. 12 and 13 show a state in which the strobe lighting device of the third embodiment is actually incorporated in a camera. 12 shows a state at a wide irradiation angle, and FIG. 13 shows a state at a narrow irradiation angle. FIG. 14 is an exploded view of the mechanism for incorporating the strobe lighting device.

As shown in these figures, the cylindrical lens 34 is attached to the lens frame 35, and this lens frame 35 is fixed to the camera body 30. Alternatively,
The cylindrical lens 34 and the lens frame 35 may be integrally formed. 12 and 13, this lens frame 35
The side plate on the front side of is omitted. A pair of recesses 35a, 35a are provided on the upper rear surface of the lens frame 35, and the upper prism 31 is arranged in the lens frame 35 with the rotating shafts 31d, 31d housed in these recesses 35a, 35a. Further, a pair of recesses 35b, 35b are also provided in the lower rear portion of the lens frame 35, and the lower prism 32 is arranged in the lens frame 35 by accommodating the rotating shafts 32d, 32d in these recesses 35b, 35b. A case 40 is attached to the back side of the lens frame 35, and shaft holding portions 40a provided on the left and right sides of the case 40 close the open ends of the recesses 35a, 35a, 35b, 35b. As a result, the upper prism 31 and the lower prism 32 are held rotatably about the rotation shafts 31d and 32d, respectively.

An arm 36 is fixed to one rotation shaft 31d of the upper prism 31 and one rotation shaft 32d of the lower prism 32.
A prism drive lever 37 that engages with the arm 36 is fixed to the. A torsion spring 38 is fitted and inserted on the one rotating shaft 31d. One end of this torsion spring 38 is locked to the projection 35c of the lens frame 35, and the other end is an arm.
The upper prism 31 is locked by the protrusion 36a of the shaft 36, and is thereby biased to rotate counterclockwise in the drawing about the rotation shaft 31d. The prism drive lever 37 is biased by the arm 36 together with the lower prism 32 in a clockwise direction about the rotation shaft 32d by receiving the biasing force of the arm 36.

On the case 40, the light source 10 and the reflecting mirror 13 are attached using the silicon band 39, and the trigger 16 is attached. Two pins 40b and 40c are provided on the back surface of the case 40 so as to project therefrom. By accommodating these pins 40b and 40c in the long holes 41b and 41c, respectively, the cam plate 41 is arranged so as to be movable in the longitudinal direction of the long holes 41b and 41c.

The cam plate 41 has an inclined cam surface 41a at one end and a rack 41d at the other end. The lower end of the tip of the prism drive lever 37, which is rotationally biased as described above, elastically contacts the cam surface 41a. Further, the rack 41d has a gear rotated by a lens barrel drive ring 42 for operating a zoom lens of the camera.
43 meshed.

With the above arrangement, when the lens barrel drive ring 42 is in the rotation position for setting the zoom lens of the camera to the wide angle side, the cam plate 41 is positioned relatively far back in FIG. Therefore, the tip of the prism drive lever 37 that is in contact with the cam surface 41a of the cam plate 41 is lowered to a relatively low position, and the prisms 31 and 32 are set to the rotation position shown in FIG. Therefore, in this case, a wide irradiation angle can be obtained.

On the other hand, when the lens barrel drive ring 42 is rotated to set the zoom lens of the camera to the telephoto side, the cam plate is moved.
41 moves to the front side in FIG. Therefore, the prism drive lever that is in contact with the cam surface 41a of the cam plate 41
The tip of 37 is pushed up to a relatively high position, and the prism
Reference numerals 31 and 32 are set to the rotation positions shown in FIG. Therefore, in this case, a narrow irradiation angle can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. The stroboscopic illumination device of the fourth embodiment is different from the device of the first embodiment described above in that the cylindrical lens 14 is movable in the direction of the irradiation optical axis O. FIG. 15A shows a state in which the fourth embodiment device obtains a wide irradiation angle.
FIG. 16 shows a state in which the fourth embodiment device obtains a narrow irradiation angle. For comparison, FIG. 15B shows the first
The example apparatus shows a state of obtaining a wide irradiation angle.

In order to obtain a particularly wide irradiation angle, the upper prism 11 and the lower prism 12 are operated to a wider irradiation angle side than the state shown in FIG. 15B, as shown in FIG. It That is, the upper prism 11 is further rotated counterclockwise about the rotation shaft 11d, and the lower prism 12 is rotated.
Is further rotated clockwise around the rotating shaft 12d. Then, the illumination region by the upper prism 11 (region 2 in FIG. 4) and the illumination region by the lower prism 12 (region 3 in FIG. 4) move in a direction away from the center of the view angle, that is, in a direction in which the irradiation angle is further expanded. .

However, as it is, the areas 2 and 3 in FIG. 4 are separated from the area 1, and a dark portion with low illuminance is generated between the areas. Therefore, use the cylindrical lens 14 as the light source.
When it is moved in the direction of approaching 10, the area 1 becomes Y in FIG.
It spreads out in the direction and the dark areas disappear.

As shown in FIG. 16, when the upper prism 11 and the lower prism 12 are in a state where a particularly narrow irradiation angle is obtained and the cylindrical lens 14 is moved in the direction away from the light source 10, the area 1 Becomes narrower in the Y direction of FIG. 4, and a narrower irradiation angle can be obtained.

Generally, when the lens is moved in the direction away from the light source, the number of light rays incident on the lens is reduced and the amount of useless light is increased. However, in the apparatus of this embodiment, the light which does not enter the cylindrical lens 14 ( Since the light ray a in FIG. 16) enters the prisms 11 and 12, the light use efficiency does not deteriorate.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The strobe lighting device according to the fifth embodiment is
Compared with the device of the first embodiment described above, the upper prism 11
Another difference is that another function is added to the rotating mechanism of the lower prism 12. That is, the rotating mechanism of the upper prism 11 and the lower prism 12 is mechanically coupled with, for example, a parallax correction lever of a camera operated at the time of close-up photography, and the prism 11 at the time of close-up photography,
12 are rotated in the same direction. For example, during wide-angle photography, when the prisms 11 and 12 are both rotated counterclockwise in the drawing around the rotation shafts 11d and 12d, respectively, the irradiation range is moved downward as a whole.

[Brief description of drawings]

FIG. 1 is a side view showing a state of a lighting device according to a first embodiment of the present invention at a wide irradiation angle.

FIG. 2 is a side view showing a state of the first embodiment apparatus at a narrow irradiation angle.

FIG. 3 is a side view showing the state of the apparatus of the first embodiment at a wide irradiation angle together with a ray trace different from that in FIG.

FIG. 4 is an explanatory diagram illustrating a relationship between a shooting angle of view on a subject surface and a light irradiation range.

FIG. 5 is a schematic diagram showing an illuminance distribution on a subject surface at a wide irradiation angle.

FIG. 6 is a schematic diagram showing an illuminance distribution on a subject surface at a narrow irradiation angle.

FIG. 7 is a perspective view showing another example of a prism and a lens used in the present invention.

FIG. 8 is a side view showing a state of a lighting device according to a second embodiment of the present invention at a wide irradiation angle.

FIG. 9 is a side view showing the state of the second embodiment device at a narrow irradiation angle.

FIG. 10 shows a state of the apparatus of the second embodiment at a wide irradiation angle,
Side view showing together with ray trace different from FIG.

FIG. 11 is a side view showing an essential part of a lighting device according to a third embodiment of the present invention.

FIG. 12 is a partially cutaway side view showing a state of the third embodiment device incorporated in a camera at a wide irradiation angle.

FIG. 13 is a partially cutaway side view showing the state of the third embodiment device incorporated in the camera at a narrow irradiation angle.

FIG. 14 is an exploded perspective view of the device of the third embodiment.

FIG. 15 is a side view showing a state of a lighting device according to a fourth embodiment of the present invention at a wide irradiation angle, in comparison with the device of the first embodiment.

FIG. 16 is a side view showing a state of the fourth embodiment apparatus at a narrow irradiation angle.

FIG. 17 is a side view of a lighting device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 10 Light source 11, 21, 31 Upper prism 11a, 21a, 31a Incident surface 11b, 21b, 31b Upper prism total reflection surface 11c, 21c, 31c Upper prism exit surface 11d, 21d, 31d Rotation of upper prism Axis 12, 22, 32 Lower prism 12a, 22a, 32a Lower prism entrance surface 12b, 22b, 32b Lower prism total reflection surface 12c, 22c, 32c Lower prism exit surface 12d, 22d, 32d Lower side Rotating axis of prism 13 Reflector 14, 34 Cylindrical lens 15 Dust cover 16 Trigger 30 Camera body 35 Lens frame 36 Arm 37 Prism drive lever 38 Torsion spring 39 Silicon band 40 Case 41 Cam plate 42 Lens barrel drive ring

Claims (6)

[Claims] 1. A lighting device for irradiating a divergent light emitted from a light source to the front, a lens for condensing light mainly emitted to the front from the light source, wherein each light emitted obliquely to the front from the light source. An incident light incident surface, a total reflection surface that totally reflects the light that has passed through this incident surface to the front side, and an emission surface that emits the light totally reflected by this total reflection surface. The lens is arranged such that the lens is sandwiched from the outside with a variable inclination with respect to
An illuminating device comprising a pair of prisms and a reflecting mirror that mainly reflects the light emitted rearward from the light source mainly forward. 2. An illumination device for irradiating divergent light emitted from a light source to the front, a lens for condensing light mainly emitted from the light source to the front, each of which has light emitted obliquely to the front from the light source. An incident light incident surface, a total reflection surface that totally reflects the light that has passed through this incident surface to the front side, and an emission surface that emits the light totally reflected by this total reflection surface. The lens is arranged such that the lens is sandwiched from the outside with a variable inclination with respect to
A pair of prisms, and a reflection mirror that mainly reflects the light emitted rearward from the light source mainly to the front, and a light reflection member is not arranged outside each of the pair of prisms. Lighting equipment. 3. A lighting device for irradiating divergent light emitted from a light source to the front, wherein a lens for converging light mainly emitted from the light source to the front, and light emitted obliquely to the front from the light source. An incident light incident surface, a total reflection surface that totally reflects the light that has passed through this incident surface to the front side, and an emission surface that emits the light totally reflected by this total reflection surface. The lens is arranged such that the lens is sandwiched from the outside with a variable inclination with respect to
A pair of prisms, a reflecting mirror that mainly reflects the light emitted rearward from the light source mainly forward, and a driving member that changes the inclination of the pair of prisms in conjunction with the zoom mechanism of the photographing lens of the camera. An illumination device characterized by being provided. 4. The light source is a straight tubular arc tube having a longitudinal direction, the lens is a cylindrical lens extending in the longitudinal direction of the light source, and the prism is extending in the longitudinal direction of the light source. The lighting device according to claim 1, wherein the lighting device is a lighting device. 5. The pair of prisms are respectively arranged so that the light emitted from the emission surface irradiates the opposite side across the irradiation optical axis. The illumination device according to item 1. 6. The illumination device according to claim 1, wherein the lens is movable in the irradiation optical axis direction.