JP2002350939A - Illuminator and photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that it is difficult to miniaturize a zoom type illuminator or to satisfactorily narrow its irradiation range. SOLUTION: The illuminator which emits light from a light source 5 through an optical member is provided with, as the optical member, a first optical member 7 and a second optical member 8 in which optical element parts 7P, 7H, 8N and 8H having different optical characteristics from each other are alternately formed in a predetermined direction within the orthogonal plane of an optical axis. These first and second optical members are disposed facing each other in an optical axis direction, and are relatively moved in the predetermined direction to change the light irradiation range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device mounted on a photographing device or the like, and more particularly, to a lighting device capable of changing an irradiation range of illumination light.

[0002]

2. Description of the Related Art Conventionally, as a zoom strobe capable of changing an irradiation range (light distribution angle), for example, there is a zoom strobe shown in FIGS.

This zoom strobe is composed of a discharge tube 1, a reflection mirror 18 and a Fresnel lens 19. The Fresnel lens 19 or the reflection mirror 18 and the discharge tube 1 are moved in the direction of the optical axis AXL to thereby form a Fresnel lens 19. The distance between the light source and the reflector 18 and the discharge tube 1 in the optical axis direction is changed to change the light distribution angle.

[0004]

However, conventionally, in order to change the light distribution angle, a Fresnel lens 19 is required.
Needs to be moved in the optical axis direction of the reflecting mirror 18,
When the Fresnel lens 19 is separated from the reflecting mirror 18, in order to converge the light directly emitted from the discharge tube 1, it is necessary to particularly increase the size of the Fresnel lens 19. ing.

[0005] Further, it has not been possible in principle to simultaneously emit both the light directly emitted from the discharge tube 1 and the light emitted after being reflected by the reflecting mirror 18 as parallel light. It was difficult to narrow.

That is, since the position on the optical axis of the discharge tube 1 itself and the position of the light source image formed by the reflecting mirror 18 are different, no matter where the Fresnel lens 19 is disposed on the optical axis, the discharge tube 1 Both the directly emitted light and the light reflected by the reflector 18 cannot be made parallel at the same time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an illuminating device which is small in size, has good illumination efficiency, and is capable of sufficiently narrowing an irradiation range.

[0008]

In order to achieve the above object, the present invention relates to a lighting device for irradiating light from a light source through an optical member, wherein the optical members have different optical characteristics from each other. Are alternately formed in a predetermined direction within a plane orthogonal to the optical axis and a second optical member.
The first and second optical members are arranged to face each other in the optical axis direction, and are relatively moved in the predetermined direction to change the light irradiation range.

That is, by the relative movement of the first and second optical members in the plane orthogonal to the optical axis, the optical element portion of the first optical member and the optical element portion of the second optical member which are opposed on the optical path. By changing the combination with, the irradiation range of the illumination light is changed, so that the light use efficiency is high and the size is small, but the illumination range can be extremely narrowed. A lighting device with a large guide number is realized.

[0010] In the first and second optical members, the optical element portions having different optical characteristics from each other are combined with the linear direction as the predetermined direction in the direction orthogonal to the optical axis and the linear direction orthogonal to the linear direction or the predetermined direction. May be alternately formed in the rotation direction around the optical axis and in the radial direction (that is, in a staggered or lattice shape).

More specifically, for example, the first optical member has an optical element portion (a cylindrical lens-shaped portion or the like) having one of a converging function and a diverging function of light and a converging function and a diverging function. And the second optical member has the other of the converging function and the diverging function (such as a cylindrical lens-shaped part); The optical element portion having no diverging action can be formed alternately.

[0012]

1 to 10 show a lighting device according to a first embodiment of the present invention. First, FIG. 1 shows an example of a film camera or a digital camera equipped with the lighting device.

In FIG. 1, reference numeral 1 denotes a camera body, and 2 denotes a lens barrel. The lens barrel 2 holds a taking lens. Reference numeral 3 denotes a finder. 4 is a lighting device,
It is built in the upper right part of the camera body 1.

As shown in FIG. 2, the illuminating device 4 has a cylindrical light-emitting discharge tube 5 as a light source and a light beam radially emitted from the discharge tube 5 other than the front, for example, the rear (object side). (A direction opposite to the direction opposite to the object), a reflecting mirror 6 that converges and reflects the light beam to the subject side, and a light beam directly incident from the discharge tube 5 and a light beam reflected and incident by the reflecting mirror 6 are converged as a light beam of a predetermined shape, and the object The first and second optical members 7 and 8 for efficiently guiding the illumination light beam to the side are configured.

The first optical member 7, as shown in FIGS. 3 and 4, etc., has a plane incident surface 7C arranged above and below the discharge tube 5, and is arranged in front of the discharge tube 5, and 5 has a cylindrical lens surface 7R having a converging function in the longitudinal direction.
A reflecting surface 7TR disposed above and below the incident surface 7C; and a cylindrical lens surface 7R and upper and lower reflecting surfaces 7TR.
It is a prism-shaped member having an emission surface disposed in front of the TR.

As shown in FIG. 5, the exit surface of the first optical member 7 has a plane portion (optical element portion) 7H extending in a vertical direction with a predetermined left-right width and a predetermined left-right width. Further, a cylindrical lens portion (optical element portion) 7P in which a plurality of cylindrical lenses having a converging action in the vertical direction are arranged in the vertical direction is formed alternately in the horizontal direction.

The exit surface of the second optical member 8 has a planar shape as a whole. On the incident surface, a plane portion (optical element portion) 8H extending in a vertical direction with a predetermined left and right width, and a predetermined portion, respectively. Cylindrical lens portions (optical element portions) 8N in which a plurality of cylindrical lenses having a left-right width and having a converging action in the vertical direction are arranged in the vertical direction are formed alternately in the horizontal direction.

FIGS. 3 and 4 show the illuminating device 4 with a narrow light distribution angle (irradiation range). 3 shows a section A in FIGS. 5 and 6, and FIG. 4 shows a section B in FIGS. 5 and 6.

In FIG. 3, of the light emitted from the discharge tube 5, the light traveling toward the left side of the drawing (the side opposite to the subject side) is returned to the discharge tube 5 again by the reflecting mirror 6. Also,
Of the light emitted from the discharge tube 5 on the right side of the drawing (subject side), the light emitted at a large angle above and below the drawing is refracted by the incident surface 7C of the first optical member 7 and then reflected by the reflecting surface 7TR. , And is emitted from the plane portion 7H of the first optical member 7 as parallel light substantially parallel to the optical axis AXL.

Here, the light emitted from the discharge tube 5 to the upper right of the drawing is refracted by the incident surface 7C and further bent upward, so that the reflecting surface 7TR of the first optical member 7 is reflected.
Can be reduced in size.

The shape of the reflecting surface 7TR of the first optical member 7 is preferably a parabola or a cylindrical aspherical surface which is almost close to the parabola in order to maintain good parallelism of emitted light.

Further, in order to prevent the light which does not satisfy the condition of total reflection with respect to the reflecting surface 7TR of the first optical member 7 from being emitted from the reflecting surface 7TR and the light use efficiency is reduced, the reflecting mirror 6 is provided. , So as to cover a region near the optical axis at the rear part of the rear surface of the reflection surface 7TR.

Further, of the light emitted from the discharge tube 5 to the right side of the paper, light substantially along the optical axis AXL and light emitted at a small angle above and below the paper (that is, the optical axis AX)
The light in the vicinity of L) is refracted by the cylindrical lens portion 7R of the first optical member 7, becomes parallel light substantially parallel to the optical axis AXL, and is emitted from the plane portion 7H. In addition, it is preferable that the cylindrical lens portion 7R is formed with a hyperboloid.

Thus, all the light emitted from the center of the discharge tube 5 is converted into parallel light by the first optical member 7.

The light emitted from the flat portion 7H of the first optical member 7 is incident on the flat portion 8H of the second optical member 8 in FIG. From the camera to the subject side.

In FIG. 4, the light that is substantially totally reflected by the reflecting surface 7TR of the first optical member 7 or parallelized by the convergence function of the cylindrical lens surface 7R is emitted from the first optical member 7. The cylindrical lens portion 7P formed on the surface receives the convergence action and emits light.

However, in FIG. 4, the cylindrical lens portion 8N of the second optical member 8 faces the cylindrical lens portion 7P, and the cylindrical lens portion 8P.
The convergence effect of the cylindrical lens portion 7P is canceled by the diverging effect of N, and the second optical member 8
From the camera to the subject side.

As described above, in the state shown in FIGS. 3 to 6, all the light emitted from the discharge tube 5 becomes parallel light and is irradiated to the subject at a narrow light distribution angle.

The first optical member 7, the reflecting mirror 6, and the discharge tube 5 move from the state shown in FIGS. 5 and 6 to the state shown in FIGS. )
Can be slid together.

That is, as shown in FIGS. 5 and 6, the plane portions 7H and 8H of both optical members 7 and 8 completely overlap, and the cylindrical lens portions 7P and 8N of both optical members 7 and 8 completely overlap. 9 and 10, the plane portion 7H of the first optical member 7 and the cylindrical lens portion 8N of the second optical member 8 completely overlap, and the cylindrical lens of the first optical member 7 as shown in FIGS. The portion 7P and the flat portion 8H of the second optical member 8 can be slid so as to completely overlap each other.

FIGS. 7 and 8 show a C section and a D section in the state of FIGS. 9 and 10, respectively. This state shows the lighting device in a state where the light distribution is wide.

In FIG. 7, the light emitted from the discharge tube 5 and collimated by the first optical member 7 is emitted from the plane portion 7H of the first optical member 7 and The light is diverged in the vertical direction by the cylindrical lens portion 8N having a diverging action, and is emitted from the second optical member 8 to the subject side.

In FIG. 8, the light emitted from the discharge tube 5 and collimated by the first optical member 7 exits from the cylindrical lens portion 7P of the first optical member 7 to have a converging action. Receiving, cylindrical lens part 7P
The light is transmitted through the flat portion 8H of the second optical member 8 disposed to face the camera and is spread from the second optical member 8 toward the subject and is emitted.

As described above, in the state shown in FIGS. 7 to 10, all the light emitted from the center of the discharge tube 5 becomes divergent light and is applied to the subject at a wide light distribution angle.

As described above, in the present embodiment, the light distribution angle in the vertical direction is increased by relatively sliding the discharge tube 5, the reflecting mirror 6, the first optical member 7 and the second optical member 8. Can be changed.

When the first optical member 7 and the second optical member 8 are in an intermediate state between the states shown in FIGS. 3 to 6 and FIGS. 7 to 10, the second optical member 8 Since the amount of light diverging in the vertical direction out of the light emitted from the light source becomes half of the state shown in FIGS. 7 to 10, the light distribution angle in the vertical direction has an intermediate value between the above two states.

The light distribution is achieved by continuously changing the overlapping area of the converging cylindrical lens portion 7P of the first optical member 7 and the divergent cylindrical lens portion 8N of the second optical member 8. The angle can be changed continuously.

Then, the illumination device 4 is connected to the photographing lens 2.
Is mounted on a camera which is a zoom lens, and the first optical member 7 is slid in conjunction with the continuous change of the focal length, so that an optimum irradiation angle corresponding to the focal length can always be obtained.

(Second Embodiment) FIGS. 11 to 19 show:
9 shows a lighting device according to a second embodiment of the present invention. The basic configuration of the illumination device of the present embodiment is substantially the same as that of the first embodiment. However, in the present embodiment, a cylindrical lens portion 9P having a converging action on the exit surface of the first optical member 9 is provided. The plane portions 9H are formed in a staggered pattern (alternately in the vertical and horizontal directions), and the divergent cylindrical lens portion 10N and the plane portions 10H are also staggered on the incident surface of the second optical member 10. It differs from the first embodiment in that it is formed in a lattice shape.

FIGS. 12 and 13 show cross sections E and F of the illumination device shown in FIGS. 14 and 15 in a state where the light distribution angle is narrow, respectively.

In FIGS. 12 and 13, the cylindrical lens portion 9P of the first optical member 9 and the cylindrical lens portion 10N of the second optical member 10 are opposed to each other so as to completely overlap.

For this reason, the light emitted from the center of the discharge tube 5 is not diverged in the vertical direction in FIGS.

In FIGS. 12 and 13, the first
The flat portion 9H of the optical member 9 and the flat portion 10H of the second optical member 10 are disposed so as to completely overlap each other.

Therefore, no refraction occurs for light parallel to the optical axis AXL, and light emitted from the center of the discharge tube 5 is emitted as parallel light.

As described above, in the state shown in FIGS. 12 to 15, the light emitted from the center of the discharge tube 5 over the entire exit surface of the illuminating device in the vertical direction in FIG. 12 to FIG. The light is emitted at a narrow light distribution angle without diverging to the subject side.

Also in this embodiment, the first optical member 9, the reflecting mirror 6, and the discharge tube 5 are different from the second optical member 10 with respect to each other.
14 and 15 can be integrally slid in the left-right direction (linear direction) from the state of FIGS. 18 and 19.

FIGS. 16 and 17 show G and H cross sections of the illumination device shown in FIGS. 18 and 19 in the state where the light distribution angle is wide, respectively.

In FIGS. 16 and 17, the cylindrical lens portion 9P of the first optical member 9 and the plane portion 10H of the second optical member 10 are disposed so as to face each other and completely overlap each other. Further, the plane portion 9H of the first optical member 9 and the cylindrical lens portion 11N of the second optical member 10 are arranged to face each other and completely overlap.

For this reason, the light emitted from the center of the discharge tube 5 is diverged in the vertical direction of the paper of FIGS. 16 and 17 and emitted.

Thus, in the state shown in FIGS. 16 to 18, the light emitted from the center of the discharge tube 5 over the entire exit surface of the lighting device in the vertical direction of the paper of FIGS. The light is diverged toward the subject and emitted at a wide light distribution angle.

(Third Embodiment) FIGS. 20 to 27 show:
9 shows a lighting device according to a third embodiment of the present invention. This embodiment is similar to the second embodiment in that the first optical member 9
The cylindrical lens portion 9P and the flat portion 9H are arranged in a staggered pattern, and the cylindrical lens portion 11N and the flat portion 11H of the second optical member 11 are arranged in a staggered pattern. The second embodiment differs from the second embodiment in that the sliding direction of the reflecting mirror 6 and the first optical member 9 with respect to the second optical member 11 is up and down.

FIGS. 20 and 21 show I and J cross sections of the illumination device shown in FIGS. 22 and 23 in a state where the light distribution angle is narrow, respectively.

20 and 21, the cylindrical lens portion 9P of the first optical member 9 and the cylindrical lens portion 11N of the second optical member 11 are opposed to each other so as to completely overlap.

For this reason, the light emitted from the center of the discharge tube 5 is not diverged in the vertical direction of the paper of FIGS.

In FIG. 20 and FIG.
The flat portion 9H of the optical member 9 and the flat portion 11H of the second optical member 11 are disposed so as to be completely overlapped.

For this reason, no refraction occurs for light parallel to the optical axis AXL, and light emitted from the center of the discharge tube 5 is emitted as parallel light.

As described above, in the state shown in FIGS. 20 to 23, the light emitted from the center of the discharge tube 5 in the vertical direction of the paper of FIGS. The light is emitted at a narrow light distribution angle without diverging to the subject side.

FIGS. 24 and 25 show K and L cross sections of the illuminating device shown in FIGS. 26 and 27 in a state where the light distribution angle is wide, respectively.

In FIGS. 24 and 25, the cylindrical lens portion 9P of the first optical member 9 and the plane portion 11H of the second optical member 11 are disposed so as to face each other and completely overlap each other. Further, the plane portion 9H of the first optical member 9 and the cylindrical lens portion 11N of the second optical member 11 are arranged to face each other and completely overlap each other.

For this reason, the light emitted from the center of the discharge tube 5 is diverged in the vertical direction in FIGS. 24 and 25 and emitted.

As described above, in the state shown in FIGS. 24 to 27, the light emitted from the center of the discharge tube 5 in the vertical direction of the paper of FIGS. The light is diverged toward the subject and emitted at a wide light distribution angle.

(Fourth Embodiment) FIGS. 28 to 35 show:
14 shows a lighting device according to a fourth embodiment of the present invention. This embodiment shows a case where a discharge bulb 12 is used as a light source instead of the discharge tube as in the first to third embodiments.

The reflecting mirror 13 has a rotationally symmetric shape about the optical axis AXL. The first optical member 14 is formed in a substantially hemispherical shape, and its exit surface has an in-plane direction of a tangent plane of the discharge sphere 12 perpendicular to the optical axis AXL (the direction perpendicular to the optical axis among the radial directions of the discharge sphere 12). ), A cylindrical lens portion 14P in which a plurality of cylindrical lenses having a converging effect are arranged in a radial direction around the optical axis AXL, and a flat portion 14H extending in the radial direction are formed in a circumferential direction around the optical axis AXL ( (Rotational direction).

The second optical member 15 is formed in a substantially disk shape, and has a diverging effect on its incident surface in the in-plane direction of the tangent plane of the discharge sphere 12 perpendicular to the optical axis AXL. A cylindrical lens portion 15N in which a plurality of cylindrical lenses are arranged in a radial direction about the optical axis AXL.
And flat portions 15H extending in the radial direction are alternately formed in the circumferential direction around the optical axis AXL.

The second optical member 15 is rotatable about the optical axis AXL with respect to the first optical member 14.

FIGS. 28 and 29 show M and N cross sections of the illumination device shown in FIGS. 30 and 31, respectively, in which the light distribution is narrow.

In FIG. 28, the cylindrical lens portion 14P of the first optical member 14 and the cylindrical lens portion 15N of the second optical member 15 are arranged so as to completely overlap each other.

For this reason, the light emitted from the center of the discharge sphere 12 is not diverged in the in-plane direction of the optical axis orthogonal plane (tangential plane) including the vertical direction in FIG. Is emitted to the subject side.

In FIG. 29, the first optical member 1
4 and the flat portion 15H of the second optical member 15.
And are arranged so as to completely overlap with each other.

For this reason, no refraction occurs for light parallel to the optical axis AXL, and light emitted from the center of the discharge sphere 12 is emitted to the subject as parallel light.

As described above, in the states shown in FIGS. 28 to 31, the discharge sphere 1
The light emitted from the center of No. 2 is emitted at a narrow light distribution angle without being diverged to the object side.

FIGS. 32 and 33 show the O and P cross sections of the illuminating device shown in FIGS. 34 and 35 with the wide light distribution angle, respectively.

In FIG. 32, the cylindrical lens portion 14P of the first optical member 14 and the flat portion 15H of the second optical member 15 are disposed so as to completely overlap each other.

In FIG. 33, the first optical member 1
4 and the cylindrical lens portion 15N of the second optical member 15 are opposed to each other so as to completely overlap with each other.

Therefore, the light emitted from the center of the discharge sphere 12 is diverged in the in-plane direction of the optical axis orthogonal plane including the vertical direction of the paper and the direction perpendicular to the paper in FIGS. Is done.

As described above, in the state shown in FIGS. 32 to 35, the discharge sphere 1
Light emitted from the center of No. 2 is diverged to the object side and emitted at a wide light distribution angle.

As described above, in the present embodiment, the relative rotation of the first optical member 14 and the second optical member 15 changes the light distribution angle in the in-plane direction orthogonal to the optical axis. Can be done.

The first optical member 14 and the second optical member 15 are in the state shown in FIGS. 28 to 31 and in the state shown in FIGS.
Is in the middle state of the second optical member 15
The amount of light diverging out of the light emitted from FIG.
Is half of the state, the light distribution angle is an intermediate value between the two states.

Thus, the converging cylindrical lens portion 14P of the first optical member 14 and the second optical member 1
By making the overlapping area of the cylindrical lens portions 15N having the divergence of 5 continuously variable, the light distribution angle can be continuously changed.

When this illumination device is mounted on a camera whose photographing lens is a zoom lens and the first optical member 14 is rotated in conjunction with the continuous change of the focal length, the illumination device always corresponds to the focal length. An optimal irradiation angle can be obtained.

(Fifth Embodiment) FIGS. 36 to 43 show:
14 shows a lighting device according to a fifth embodiment of the present invention. The basic configuration of the illuminating device of this embodiment is substantially the same as that of the above-described fourth embodiment. However, in this embodiment, a cylindrical lens portion 16P having a converging function is formed on the exit surface of the first optical member 16. The flat portions 16H are formed in a staggered pattern (alternate in the circumferential direction and the radial direction), and the divergent cylindrical lens portion 17N and the flat portions 17H are also staggered on the incident surface of the second optical member 17. It differs from the first embodiment in that it is formed in a lattice shape.

FIGS. 36 and 37 show Q and R cross sections of the illuminating device shown in FIGS. 38 and 39, respectively, in which the light distribution angle is narrow.

In FIGS. 36 and 37, the cylindrical lens portion 16P of the first optical member 16 and the cylindrical lens portion 17N of the second optical member 17 are arranged so as to completely overlap each other.

For this reason, the light emitted from the center of the discharge sphere 12 is not diverged in the in-plane direction orthogonal to the optical axis and is emitted to the subject as parallel light.

In FIGS. 36 and 37, the first
The flat portion 16H of the optical member 16 and the flat portion 17H of the second optical member 17 are arranged so as to completely overlap each other.

For this reason, the light parallel to the optical axis AXL has no refraction effect, and the light emitted from the center of the discharge sphere 12 is emitted as parallel light.

Thus, in the state shown in FIGS. 36 to 39, the discharge sphere 1
The light emitted from the center of No. 2 is emitted at a narrow light distribution angle without being diverged to the object side.

Also in this embodiment, the second optical member 17 can be rotated with respect to the first optical member 16 from the state shown in FIGS. 38 and 39 to the state shown in FIGS. 42 and 43.

FIGS. 40 and 41 respectively show S and T cross sections of the illumination device shown in FIGS. 42 and 43 in a state where the light distribution angle is wide.

In FIGS. 40 and 41, the cylindrical lens portion 16P of the first optical member 16 and the flat portion 17H of the second optical member 17 are disposed so as to face each other and completely overlap each other. In addition, the plane portion 16H of the first optical member 16 and the cylindrical lens portion 17N of the second optical member 17 are arranged to face each other and completely overlap each other.

Therefore, the light emitted from the center of the discharge sphere 12 is diverged and emitted in the in-plane direction orthogonal to the optical axis.

Thus, in the state shown in FIGS. 40 to 43, the discharge sphere 1
The light emitted from the center of No. 2 is diverged to the object side and emitted at a wide light distribution angle.

In each of the above embodiments, since the optical element portions provided on the first and second optical members having a converging function or a diverging function are formed by cylindrical lenses, the shape is simple and easy to produce. There are advantages.

However, in order to further reduce the thickness, a cylindrical Fresnel lens may be used instead of the cylindrical lens.

In the first to third embodiments, the case where the first optical member, the reflecting mirror and the discharge tube are slidable with respect to the fixed second optical member has been described. The second optical member may be slidable with respect to the first optical member and the like.

In the fourth and fifth embodiments,
The case has been described where the second optical member is rotatable with respect to the fixed first optical member, the reflecting mirror, and the discharge sphere. However, the first optical member and the like are fixed with respect to the fixed second optical member. May be rotatable.

The first and second optical members described in each of the above embodiments are preferably made of a transparent resin such as acrylic having a good visible light transmittance or a glass mold.

In each of the above embodiments, the first optical member is provided with the converging optical element (cylindrical lens), and the second optical member is provided with the diverging optical element (cylindrical lens). Although the description has been given of the case where the optical element is provided, the optical element having a diverging function may be provided on the first optical member side, and the optical element having a converging function may be provided on the second optical member side.

Further, in each of the above-described embodiments, the illumination device suitable for the strobe device of the camera has been described. However, the illumination device of the present invention is considered to have a wide application range as an illumination device whose illumination range is desired to be variable. For example, it is conceivable that the present invention can be applied to, for example, indoor lighting when it is desired to change the lighting range depending on the situation.

[0100]

As described above, according to the present invention,
The relative movement of the first and second optical members in the plane orthogonal to the optical axis changes the combination of the optical element portion of the first optical member and the optical element portion of the second optical member that face each other on the optical path. In this way, the illumination range of the illumination light is changed, so that the light use efficiency is high and the illumination range can be made extremely small while the size is small. Lighting device with a large value can be realized.

If this illumination device is used as a photographing device, it is possible to realize a photographing device that is small in size and can appropriately set the irradiation range of the subject illumination light with zooming of the photographing lens.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a camera on which a lighting device according to a first embodiment of the present invention is mounted.

FIG. 2 is a perspective view of a main part of the lighting device according to the first embodiment.

FIG. 3 is a cross-sectional view of the lighting device of the first embodiment in a state where a light distribution angle is narrow.

FIG. 4 is a cross-sectional view of the illumination device of the first embodiment in a state where a light distribution angle is narrow.

FIG. 5 is a front view of the lighting device of the first embodiment in a state where a light distribution angle is narrow.

FIG. 6 is a bottom view of the lighting device of the first embodiment in a state where the light distribution angle is narrow.

FIG. 7 is a cross-sectional view of the lighting device of the first embodiment in a state where the light distribution angle is wide.

FIG. 8 is a cross-sectional view of the lighting device of the first embodiment in a state where the light distribution angle is wide.

FIG. 9 is a front view of the lighting device of the first embodiment in a state where the light distribution angle is wide.

FIG. 10 is a bottom view of the lighting device of the first embodiment in a state where the light distribution angle is wide.

FIG. 11 is a perspective view of a main part of a lighting device according to a second embodiment of the invention.

FIG. 12 is a sectional view of the illumination device of the second embodiment in a state where the light distribution angle is narrow.

FIG. 13 is a sectional view of the illumination device of the second embodiment in a state where the light distribution angle is narrow.

FIG. 14 is a front view of the lighting device of the second embodiment in a state where the light distribution angle is narrow.

FIG. 15 is a bottom view of the illumination device of the second embodiment in a state where the light distribution angle is narrow.

FIG. 16 is a sectional view of the illumination device of the second embodiment in a state where the light distribution angle is wide.

FIG. 17 is a cross-sectional view of the lighting device of the second embodiment in a state where the light distribution angle is wide.

FIG. 18 is a front view of the lighting device of the second embodiment in a state where the light distribution angle is wide.

FIG. 19 is a bottom view of the lighting device of the second embodiment in a state where the light distribution angle is wide.

FIG. 20 is a sectional view of the lighting device according to the third embodiment of the present invention in a state where the light distribution angle is narrow.

FIG. 21 is a cross-sectional view of the lighting device of the third embodiment in a state where the light distribution angle is narrow.

FIG. 22 is a front view of the lighting device of the third embodiment in a state where the light distribution angle is narrow.

FIG. 23 is a bottom view of the lighting device of the third embodiment in a state where the light distribution angle is narrow.

FIG. 24 is a cross-sectional view of the lighting device of the third embodiment in a state where the light distribution angle is wide.

FIG. 25 is a cross-sectional view of the lighting device of the third embodiment in a state where the light distribution angle is wide.

FIG. 26 is a front view of the lighting device of the third embodiment in a state where the light distribution angle is wide.

FIG. 27 is a bottom view of the lighting device of the third embodiment in a state where the light distribution angle is wide.

FIG. 28 is a sectional view of a lighting device according to a fourth embodiment of the present invention in a state where a light distribution angle is narrow.

FIG. 29 is a cross-sectional view of the lighting device of the fourth embodiment in a state where the light distribution angle is narrow.

FIG. 30 is a front view of the lighting device of the fourth embodiment in a state where the light distribution angle is narrow.

FIG. 31 is a bottom view of the illumination device of the fourth embodiment in a state where the light distribution angle is narrow.

FIG. 32 is a sectional view of the illumination device of the fourth embodiment in a state where the light distribution angle is wide.

FIG. 33 is a sectional view of the illumination device of the fourth embodiment in a state where the light distribution angle is wide.

FIG. 34 is a front view of the lighting device of the fourth embodiment in a state where the light distribution angle is wide.

FIG. 35 is a bottom view of the lighting device of the fourth embodiment in a state where the light distribution angle is wide.

FIG. 36 is a sectional view of a lighting device according to a fifth embodiment of the present invention in a state where a light distribution angle is narrow.

FIG. 37 is a cross-sectional view of the lighting device of the fifth embodiment when the light distribution angle is narrow.

FIG. 38 is a front view of the lighting device of the fifth embodiment in a state where the light distribution angle is narrow.

FIG. 39 is a bottom view of the lighting device of the fifth embodiment in a state where the light distribution angle is narrow.

FIG. 40 is a sectional view of the lighting device of the fifth embodiment in a state where the light distribution angle is wide.

FIG. 41 is a cross-sectional view of the lighting device of the fifth embodiment in a state where the light distribution angle is wide.

FIG. 42 is a front view of the lighting device of the fifth embodiment in a state where the light distribution angle is wide.

FIG. 43 is a bottom view of the lighting device of the fifth embodiment in a state where the light distribution angle is wide.

FIG. 44 is a cross-sectional view of a conventional lighting device in a direction perpendicular to a discharge tube.

FIG. 45 is a front view of a conventional lighting device.

FIG. 46 is a longitudinal sectional view of a discharge tube of a conventional lighting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Camera main body 2 ... Lens barrel 3 ... Finder 4 ... Illumination device 5 ... Emitting discharge tube 6,13,18,20,21 ... Reflection mirror, 7,9,14,16 ... First optical member 7P, 9P .., 14P, 16P... Cylindrical lenses having converging action 7H, 9H, 14H, 16H. Cylindrical lens portion 8H, 10H, 11H, 15H, 17H: planar portion 12: light emitting discharge sphere 19: Fresnel lens

Claims (13)

[Claims] 1. An illuminating device for irradiating light from a light source through an optical member, wherein, as the optical member, optical element portions having mutually different optical characteristics are alternately formed in a predetermined direction in a plane orthogonal to an optical axis. A first optical member and a second optical member, wherein the first and second optical members are opposed to each other in an optical axis direction, and are relatively moved in the predetermined direction to change a light irradiation range. A lighting device characterized by the above-mentioned. 2. The lighting device according to claim 1, wherein the predetermined direction is a linear direction. 3. In the first and second optical members, optical element portions having optical characteristics different from each other are alternately formed in a linear direction as the predetermined direction in an optical axis orthogonal direction and a direction orthogonal to the linear direction. The lighting device according to claim 2, wherein: 4. The lighting device according to claim 1, wherein the predetermined direction is a rotation direction around an optical axis. 5. In the first and second optical members, optical element portions having optical characteristics different from each other are alternately formed in the rotation direction as the predetermined direction in the direction orthogonal to the optical axis and in the radial direction. The lighting device according to claim 4, wherein: 6. An optical element having one of a converging function and a diverging function of light and an optical element having no converging and diverging functions are alternately formed on the first optical member. In addition, the second optical member has an optical element portion having the other of the converging action and the diverging action, and an optical element portion having no converging action and the diverging action formed alternately. The lighting device according to claim 1. 7. The optical element section, wherein the light source has a tube shape, and the first optical member has one of a light converging function and a light diverging function in a direction orthogonal to a longitudinal direction of the light source. And an optical element portion having neither a converging action nor a diverging action are alternately formed, and the second optical member has a converging action and a diverging action in a direction orthogonal to a longitudinal direction of the light source. 7. The lighting device according to claim 6, wherein the optical element having the other and the optical element having no convergence and divergence are alternately formed. 8. The apparatus according to claim 7, wherein the first optical member converts the light from the light source into substantially parallel light in a direction orthogonal to a longitudinal direction of the light source and emits the light.
The lighting device according to claim 1. 9. An optical element portion, wherein the light source has a spherical shape, and the first optical member has one of a light converging action and a light diverging action in a radial direction of the light source orthogonal to an optical axis. And an optical element part having no convergence action and no divergence action are formed alternately, and the entrance face of the second optical member has a convergence action and a divergence action with respect to an in-plane direction of a plane orthogonal to the optical axis. 7. The lighting device according to claim 6, wherein the optical element having the other and the optical element having no convergence and divergence are alternately formed. 10. The apparatus according to claim 7, wherein the first optical member converts light from the light source into substantially parallel light in a direction orthogonal to a longitudinal direction of the light source and emits the light. Lighting equipment. 11. The optical element having a converging or diverging action has a cylindrical lens shape, and the optical element having no converging or diverging action has a planar shape. 9. The lighting device according to any one of items 1 to 8. 12. The light source according to claim 1, wherein the first optical member converts light from the light source into substantially parallel light in a radial direction of the light source orthogonal to an optical axis and emits the light.
The lighting device according to any one of the above. 13. An imaging device comprising the lighting device according to claim 1. Description: