JP2000310808A - Illumination device and photographic device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to extremely miniaturize the shape over the entire part of an illumination optical system and to vary an irradiation angle by disposing a motor having holding means for holding a magnet in a position offset in the center of the poles of the magnet from a straight line connecting the centers of outer magnetic poles and the center of rotation of the magnet. SOLUTION: A step motor is constituted by forming the magnet 101 to a hollow cylindrical shape, dividing the outer peripheral surface of the magnet 101 by n in a circumferential direction, thereby constituting magnetization parts and alternately magnetizing the magnetization parts to different poles. A coils 102 are arranged alongside the magnet 101 in its axial direction and the outer magnetic poles 118a and 118b and inner magnetic poles 118c and 118d of a stator 118 magnetized by the coils 102 are disposed to face the outer peripheral surface and inner peripheral surface of the magnet 101. Further, the holding means 101, 121 and 122 for holding the magnet in the position where the centers of the poles of the magnet 101 are offset from the straight line connecting the centers of the outer magnetic poles 118a and 118b and the center of rotation of the magnet 101 are disposed when the coils are nonconductive. As a result, the motor may be microminiaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a certifying device for photographing in a video camera, a film camera, a digital camera and the like used for photographing and a photographing device using the same, and more particularly, to downsizing and irradiation of the whole device. The irradiation angle is changed while improving the light collection efficiency of the light beam.

[0002]

2. Description of the Related Art Illumination devices (flash light emitting devices, strobe devices) used in photographing devices such as cameras are designed to efficiently converge light beams emitted in various directions from a light source within a required irradiation angle of view. ing.

In particular, in recent lighting devices, an optical member using total reflection such as a prism or a light guide is arranged in place of a Fresnel lens arranged to change an irradiation angle in front of a light source. This improves the light collection efficiency,
The size is reduced.

On the other hand, in an illumination device having a fixed irradiation range, an unnecessary range is illuminated in a telephoto state in which the irradiation range is narrow due to a high magnification zoom of a photographing device (photographing lens).
Energy loss increases, but to resolve this phenomenon,
2. Description of the Related Art Conventionally, various illumination angle variable illumination devices that perform illumination corresponding to a photographing range have been proposed.

The present applicant has proposed a lighting device to which the above two techniques are applied, for example, in Japanese Patent Application Laid-Open No. 4-138439.

In this publication, the relative position relationship between the optical prism and the light source is relatively changed with respect to the condensing optical system which performs total reflection by the optical prism, so that the reflection on the total reflection surface is improved.
There is one that changes the irradiation range by switching transmission.

Japanese Patent Application Laid-Open No. 8-262538 proposes an illuminating device in which an optical prism is divided into a plurality of parts, and the optical prisms arranged vertically are rotated to switch the irradiation range.

More specifically, when the upper, lower, and central three regions overlap, the most condensed state is formed, and then the distribution of the upper and lower light distribution is gradually shifted outward by rotating the optical prism. A method is adopted in which the irradiation range is shifted.

In recent years, in a photographing device such as a camera, the size and weight of the device itself have been reduced, while the photographing lens has been tending to have a high magnification zoom. In general, the F-number of a photographing lens is gradually becoming darker due to the miniaturization and high magnification of such a photographing apparatus. Therefore, when shooting without using the auxiliary light source (flash device), the shutter speed becomes slow, and an unsuccessful failure photograph may occur due to camera shake.

In order to overcome this situation, a photographing device such as a camera usually has a built-in lighting device (hereinafter, a strobe device) as an auxiliary light source. From the above situation, the use frequency of the auxiliary lighting device has been greatly increased as compared with the related art, and the light emission amount required for one photographing has also tended to increase.

From such a background, Japanese Patent Laid-Open Publication No.
No. 8439 discloses an upper and lower surface on which a light beam mainly emitted to the side of a light source is made incident on an optical member, then totally reflected and condensed in a certain direction on the front surface of the flash light emitting device. It consists of a surface that has a positive refractive power formed on the front and condenses light, and after condensing by each surface, the condensing optical system that emits to the subject side from the same exit surface, the optical prism and the light source By changing the positional relationship relatively, reflection and transmission on the total reflection surface are switched to change the irradiation range.

[0012]

Problems to be Solved by the Invention
In the method proposed in Japanese Patent Application Publication No. 9-205, it is necessary to appropriately set the surface shape for switching between total reflection and transmission in order to accurately change the irradiation angle.

On the other hand, an optical prism disclosed in Japanese Patent Application Laid-Open No. 8-262538 is divided into a plurality of optical prisms, the optical prisms arranged vertically are rotated, and the irradiation range is switched. Only the irradiation direction is shifted to the whole, and the light distribution characteristic itself is not changed. For this reason, it is difficult to obtain a uniform light distribution at each zoom point.

In particular, discontinuous points occur at the superimposed portions of the light distributions at the top and bottom and at the center, and the uniform distribution is not always obtained over the entire irradiation range. There may have been.

In addition, three optical prism members are required at the top, bottom, and center, and two optical prisms must be moved in synchronization with each other.

When the irradiation range is switched, a motor for changing the focal length of the photographing lens barrel or a connecting means for rotating the optical prism of the illuminating device or changing the position of the optical parts in conjunction with the movement of the photographing lens barrel is required. In some cases, the connecting means may result in a complicated mechanism, a loss of compactness, and a loss of freedom in the layout of the lighting device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an illumination device with a variable illumination angle capable of changing the illumination angle by extremely miniaturizing the overall shape of the illumination optical system, and an imaging device using the same.

In addition, the present invention provides an illumination device with a variable illumination angle capable of making the light distribution characteristics uniform at each zoom point and reducing the amount of movement associated with the variable illumination angle, and an imaging device using the same. The purpose is to provide.

In addition to the above, the present invention provides an illumination device with a variable illumination angle which has a simple mechanism which does not need to be mechanically linked from the taking lens barrel and which is extremely small, thin and lightweight. An object of the present invention is to provide a photographing device using the same.

It is another object of the present invention to provide an illumination device having a variable illumination angle capable of obtaining uniform light distribution characteristics at each zoom point by utilizing energy from a light source with high efficiency, and an imaging device using the same. And

[0021]

According to a first aspect of the present invention, there is provided a lighting device comprising: a magnet having an outer peripheral surface divided in a circumferential direction and alternately magnetized to different poles and rotatable about a rotation center; A coil disposed in the axial direction, an outer magnetic pole portion that is excited by the coil, an inner magnetic pole portion that faces the outer circumferential surface of the magnet, and an inner magnetic pole portion that faces the inner circumferential surface. A motor having holding means for holding the magnet at a position shifted from a straight line connecting the center and the rotation center of the magnet, light source means, and a part arranged in front of the light source means for totally reflecting part of the incident light beam An optical prism including a surface for controlling the emitted light, an optical panel disposed in front of the optical prism, a relative distance to the optical prism is changeable, and the optical panel is linked to the rotation of the motor. The optical pre It is characterized in that includes a changing means for changing the relative distance between the beam.

According to a second aspect of the present invention, there is provided a lighting device comprising: a motor;
A light source means, an optical prism arranged in front of the light source means for totally reflecting part of the incident light beam to control the emitted light, and an optical prism arranged in front of the optical prism to change a relative distance between the optical prism and the optical prism An optical panel, a rotating member that rotates in conjunction with the rotation of the motor, and has a cylindrical portion that is eccentric with respect to the center of rotation, and a rotation of the cylindrical portion that fits with the eccentric cylindrical portion of the rotating member. A driving member for changing a relative distance between the optical panel and the optical prism by movement is provided.

According to a third aspect of the present invention, there is provided a lighting device comprising: a magnet whose outer peripheral surface is divided in a circumferential direction and is alternately magnetized to different poles and rotatable around a rotation center; and a coil arranged in the axial direction of the magnet. And an outer magnetic pole portion which is excited by the coil and an inner magnetic pole portion which faces the outer peripheral surface of the magnet and an inner magnetic pole portion which faces the inner peripheral surface. The center of the magnet is defined by the center of the outer magnetic pole and the rotation center of the magnet. A motor having holding means for holding the magnet at a position deviated from a straight line connecting the light source means, a light source means, and a light flux from the light source means, which is arranged in an optical axis direction for reflecting or / and refracting to deflect. Two optical members, and the motor is used to change the relative positional relationship between the two optical members so as to make the emission angle of the light beam from one of the two optical members variable. That It is a symptom.

According to a fourth aspect of the present invention, there is provided a lighting device comprising: a magnet whose outer peripheral surface is divided in a circumferential direction and is alternately magnetized to different poles and rotatable around a rotation center; and a coil arranged in the axial direction of the magnet. And an outer magnetic pole portion which is excited by the coil and an inner magnetic pole portion which faces the outer peripheral surface of the magnet and an inner magnetic pole portion which faces the inner peripheral surface. The center of the magnet is defined by the center of the outer magnetic pole and the rotation center of the magnet. A motor having holding means for holding the magnet at a position shifted from a straight line connecting the light source means, a light source means, an optical prism disposed in front of the light source means, and an optical element disposed further in front of the optical prism. Having a panel, the motor allows the relative positional relationship between the optical prism and the optical panel to be displaceable,
It is characterized in that the emission angle of the light beam emitted from the optical panel is variable.

According to a fifth aspect of the present invention, there is provided a photographing apparatus including the illumination device according to any one of the first to fourth aspects.

The photographing apparatus according to the sixth aspect of the present invention is the first aspect of the present invention.
An imaging device having two or four lighting devices, wherein the optical panel exposes at least a part of a light emitting portion on an outer surface of the imaging device, and according to a situation where the imaging device is placed. It is characterized in that the irradiation angle of a light beam emitted from the lighting device is variable.

[0027]

1 to 13 are explanatory views of a first embodiment of the present invention. 1 to 4 are explanatory views showing driving means such as a motor used in this embodiment. FIG. 1 is an exploded perspective view of the motor, and FIG. 2 is an axial view of the motor after the step motor is assembled. FIG. 3 is a sectional view, and FIG.
FIG. 3 is a sectional view taken along line EE in FIG. 2. FIG. 4 is a sectional view showing the positional relationship between the stator and the magnet.

FIGS. 5 to 10 are schematic views of a main part of the flash light emitting device according to the first embodiment of the present invention. 5 and 6 are longitudinal sectional views of a main part of an optical system of the flash light emitting device.
FIG. 7 is a perspective view of a camera to which the flash light emitting device of the present invention is applied, and FIG. 8 is a perspective view of only the optical system of the flash light emitting device as viewed from the front. ing. FIGS. 5 and 6 also show ray trace diagrams of light rays emitted from the center of the light source.

FIGS. 11 to 13 are schematic views of a main portion showing the entire flash device according to the first embodiment of the present invention. 11 is a perspective view, FIG. 12 is a top view, and FIG. 13 is a bottom view.

1 to 3, reference numeral 101 denotes a rotor R
The rotor 101 is a cylindrical magnet, and the outer surface of the rotor 101 is divided into n parts in the circumferential direction (in the present embodiment, divided into four parts) to form a magnetized portion. , N poles are alternately magnetized.

Here, the magnetized portions 101a, 101b, 10
1c and 101d, the magnetized portions 101a and 101d
c is magnetized to the S pole, and the magnetized portions 101b and 101d are magnetized to the N pole. The magnet 101 is made of a plastic magnet material formed by injection molding. Thus, the thickness of the cylindrical shape in the radial direction can be made very thin.

The magnet 101 has a fitting portion 101e having a small inner diameter at the center in the axial direction. Reference numeral 107 denotes an output shaft serving as a rotor shaft. The output shaft 107 is fixed to the fitting portion 101e of the magnet 101 serving as a rotor by press-fitting. Since the magnet 101 is made of a plastic magnet molded by injection molding, it does not crack even when assembled by press-fitting, and can be easily manufactured even with a complicated shape having a fitting portion 101e having a small inner diameter in the axial center. Becomes Further, since the output shaft 107 and the magnet 101 are assembled and fixed by press-fitting, it is easy to assemble and can be manufactured at low cost. These output shafts 107
And the magnet 101 constitute a rotor.

In particular, Nd-
A plastic magnet formed by injection molding a mixture of a Fe-B-based rare earth magnetic powder and a thermoplastic resin binder such as polyamide is used. Thus, while the bending strength of the compression molded magnet is about 500 kgf / cm ² , for example, when a polyamide resin is used as a binder material,
A bending strength of at least 00 kgf / cm ² can be obtained, and a thin cylindrical shape that cannot be obtained by compression molding can be formed. As described later, the performance of the motor is enhanced by the thin cylindrical configuration.

Further, the shape for fixing the rotor shaft 107 can be integrated, and the shape for fixing the rotor shaft 107 can be integrated.
7 is obtained. Further, since the rotor shaft is excellent in strength, it does not break even when the rotor shaft is press-fitted.

At the same time, since the fixed portion of the rotor shaft 107 is integrally formed, the magnet 10
The coaxial accuracy of one part is improved, the runout can be reduced, the gap distance with the magnet stator part can be reduced, and the magnetic property of the injection molded magnet is 8 MGOe or more compared to the compression magnet. Is about 5 to 7 MGOe, but a sufficient output torque of the motor can be obtained.

In addition, since the injection molded magnet has a thin resin film formed on the surface and generates much less rust than the compression magnet, rust prevention treatment such as painting can be eliminated.

In addition, the quality can be improved without the adhesion of magnetic powder, which is a problem with the compression magnet, and the surface swelling which is likely to occur at the time of antirust coating.

Reference numeral 102 denotes a cylindrical coil. The coil 102 is arranged concentrically with the magnet 101 and arranged in the axial direction of the magnet 101. Coil 102
Has the same outer diameter as the outer diameter of the magnet 101.

Reference numeral 118 denotes a stator made of a soft magnetic material.
It consists of an outer cylinder and an inner cylinder. A coil 102 is provided between the outer cylinder and the inner cylinder of the stator 118, and the coil 102 is energized to excite the stator 118. The outer cylinder and the inner cylinder of the stator 118 have outer poles 118a, 118b and inner poles 118c, 1 at their tips.
18d.

The inner magnetic pole 118c and the inner magnetic pole 118d
Are 360 / <n / so that they are in phase with each other.
2> degrees, that is, 180 degrees.
The outer magnetic pole 118a faces the inner magnetic pole 118d, and the outer magnetic pole 118b faces the inner magnetic pole 118d. Outer magnetic poles 118a, 118 of stator 118
b is formed by a notch and a tooth extending in a direction parallel to the axis. This configuration allows the formation of magnetic poles while minimizing the diameter of the motor.

That is, if the outer magnetic poles 118a, 118b
Is formed by the unevenness extending in the radial direction, the diameter of the motor increases accordingly. In this embodiment, the outer magnetic pole 118 is formed by the notch hole and the tooth extending in the direction parallel to the axis.
a, 118b, the diameter of the motor can be minimized.

Outer magnetic poles 118a, 11 of stator 118
8b and the inner magnetic poles 118c and 118d
The magnet 101 is provided so as to sandwich one end of the magnet 101 so as to face the outer peripheral surface and the inner peripheral surface of one end of the magnet 101. One end of the output shaft 7 is rotatably fitted in the hole 118e of the stator 118.

Accordingly, the magnetic flux generated by the coil 102 is applied to the outer magnetic poles 118a and 118b and the inner magnetic pole 11
8c and 118d, the magnet 101 which is a rotor
, So that it effectively acts on the magnet, which is a rotor, to increase the output of the motor.

The magnet 101 is made of a plastic magnet material formed by injection molding as described above, so that the thickness of the cylindrical shape in the radial direction can be made extremely thin.

Therefore, the outer magnetic pole 118 of the stator 118
The distance between the inner magnetic poles 118a and 118b and the inner magnetic poles 118c and 118d can be made very small, and the magnetic resistance of the magnetic circuit formed by the coil 102 and the first stator can be made small. As a result, a large amount of magnetic flux can be generated with a small current, so that the output of the motor can be increased, the power consumption can be reduced, and the size of the coil can be reduced.

Reference numeral 120 denotes a cover as a cylindrical member made of a non-magnetic material. The outer magnetic poles 118a and 118b of the stator 118 are fitted to the inner diameter of the cover 120 and fixed with an adhesive or the like.

As for the output shaft 107, the fitting portion 107a has the cover 1
20 and the fitting portion 107b of the stator 1
18 so as to be rotatable.

FIG. 2 is a sectional view of the motor, and FIG.
(A), (b), (c), and (d) are cross-sectional views taken along line AA of FIG. Q1 in FIG. 3 represents the center of the outer magnetic pole 118a of the stator 118, and Q2 represents the stator 1
18 represents the center of the outer magnetic pole 118b, and Q3 represents the center of rotation of the magnet 101.

Reference numerals 121 and 122 denote positioning stators which are made of a soft magnetic material and are fixed to the inner diameter portion 120a of the cover 120.

The positioning stator 121 faces the outer peripheral surface of the magnet 101 and is located between the outer magnetic poles 118a and 118b of the stator 118 in the circumferential direction. As shown in FIG. 3, the positioning stator 121 is arranged between the outer magnetic poles 118a and 118b in the circumferential direction and the outer magnetic pole 1 is provided.
It is located near 18a. Positioning stator 122
Are located in the circumferential direction between the outer magnetic poles 118a and 118b and closer to the outer magnetic pole 118b.

The positioning stators 121 and 122 are not in contact with the stator 118 and the inner magnetic poles 118c and 11
8d, the outer magnetic poles 118a and 118
It is hardly magnetized as compared with 8b, and does not contribute to driving the magnet 101.

As shown in FIG. 3A, the stop positions of the magnet 101 when the coil 102 is not energized by the positioning stators 121 and 122 are magnetized portions 101a to 101d.
Center k1 to k4 of the outer pole of the stator 118
The center Q1 of 18a and 118b and the rotation center Q of the magnet
3 and stops at a position deviated from the straight line connecting the lines 3 and 3. When the coil 102 is energized from this position, the positioning stators 121 and 122 are not excited as described above and are not
a, 118b and the inner magnetic poles 118c, 118d are excited, and the force of the excited outer magnetic poles 118a, 118b acting on the magnetized portions 101a to 101d of the magnet 101 always goes in the rotation direction of the magnet 101. Therefore, the magnet 101 is started smoothly.

If the positioning stators 121 and 122 are not provided, the magnet 1 when the coil 102 is not energized
4 (a) and 4 (b)
Will be either. FIG. 4A shows the magnetized portions 101a and 10a.
The center K1, K2 of the pole of 1c is the outer magnetic pole 118a, 118
Since it is on a straight line connecting the centers Q1 and Q2 of b and the rotation center Q3 of the magnet 10, even if the coil 102 is energized, the electromagnetic force does not act in the direction of rotating the magnet 101.

In the case of FIG. 4B, it is possible to start by energizing the coil 102. However, unless the energization is changed at a certain timing, the coil 102 does not rotate stably. That is, when the outer magnetic poles 118a and 118b are excited to the N pole, for example, from the state of FIG. 4B, the magnet 101 stops at the same position as that of FIG. Even if the magnetic poles 118a and 118b are excited to the S pole, the electromagnetic force does not act in the direction in which the magnet is rotated as described with reference to FIG.

In the present embodiment, the positioning stator 121,
Reference numeral 122 denotes a holding unit for positioning the magnet 101. The positioning stators 121, 1
Since the motor 22 is located between the outer magnetic poles 118a and 118b of the stator 118, the motor 22 can be configured without increasing the size of the motor.

Next, the operation of the motor will be described. FIG. 3 (a)
In this state, the coil 102 is energized to make the outer magnetic poles 118a and 118b of the stator 118 N poles and the inner magnetic pole 11
When the magnetic poles 8c and 118d are excited to the S pole, the magnet 101 as the rotor rotates counterclockwise to the state shown in FIG.

Since the positioning stators 121 and 122 are hardly excited by the coil 102, they are substantially magnetized by the magnetized portions 101a to 101d of the magnet 1 and the stator 118.
Outer magnetic poles 118a, 118b, inner magnetic poles 118c, 1
The position of the magnet is determined by the excitation state of the 18d coil 102, and the state shown in FIG. 3B is obtained.

When the current supply to the coil 102 is stopped in this state, the state shown in FIG.

Next, the energization of the coil 102 is reversed so that the outer magnetic poles 118a and 118b of the stator 118 are set to S poles and the inner magnetic poles 118c and 118d are excited to N poles.
The magnet 101, which is a rotor, further rotates counterclockwise, and enters the state shown in FIG.

Thereafter, by sequentially switching the energizing direction to the coil 102, the magnet 101, which is a rotor, rotates to a position corresponding to the energizing phase. That is, the present motor can operate as a step motor.

Here, a description will be given of the fact that the step motor having such a configuration is optimal for miniaturizing the motor.

The basic structure of the step motor will be described. First, the magnet 101 is formed in a hollow cylindrical shape, and second, the outer peripheral surface of the magnet 101 is divided into n parts in the circumferential direction to form a magnetized part. Third, the magnets are alternately magnetized at different poles.
Fourth, the outer magnetic poles 118a and 11 of the stator 118 which are excited by the coil 102 are fourthly arranged.
8b and the inner magnetic poles 118c, 118d
Fifth, the outer magnetic poles 118a and 118b are constituted by cutout holes and teeth extending in a direction parallel to the axis.
When the power supply 02 is not energized, the holding means 101, 121, 122 hold the center of the pole of the magnet 101 at a position shifted from the straight line connecting the centers Q1, Q2 of the outer magnetic poles 118a, 118b and the rotation center Q3 of the magnet 101. It is prepared.

The diameter of this step motor is
It suffices that the diameter of the stator 118 is large enough to make the magnetic poles of the stator 118 face each other, and the length of the step motor only has to be the length of the magnet 101 plus the length of the coil 102. Will be. For this reason, the size of the step motor is determined by the diameter and length of the magnet 101 and the coil 102. If the diameter and length of the magnet and coil are made extremely small, the step motor can be made very small. It is.

At this time, the magnet 101 and the coil 1
If the diameter and the length of 02 are very small, it is difficult to maintain the accuracy as a step motor. However, this is because the magnet is formed in a hollow cylindrical shape, and the magnet formed in the hollow cylindrical shape is used. The problem of accuracy of the step motor is solved by a simple structure in which the outer magnetic poles 118a and 118b and the inner magnetic poles 118c and 118d of the stator face the outer peripheral surface and the inner peripheral surface.

At this time, not only the outer peripheral surface of the magnet,
If the inner peripheral surface of the magnet is divided in the circumferential direction and magnetized,
The output of the motor can be further increased.

When the motor is stopped and the coil is first energized by the holding means 101, 121, 122, the force of the magnetic flux generated from the coil acting on the magnet is not directed toward the center of rotation of the magnet, and the rotation is started stably. Will be able to

The motor includes a magnet having at least an outer peripheral surface divided in a circumferential direction and alternately magnetized to different poles and rotatable about a rotation center, and a coil is arranged in an axial direction of the magnet. The outer magnetic pole portion and the inner magnetic pole portion to be excited are opposed to the outer peripheral surface and the inner peripheral surface of the magnet, and the center of the magnet pole is shifted from a straight line connecting the center of the outer magnetic pole and the rotation center of the magnet. Since the motor is provided with the holding means for holding the motor at a position, a motor having a completely new configuration different from the conventional one can be obtained, and an optimum configuration can be obtained for miniaturizing the motor.

The diameter of the motor only needs to be large enough to make the magnetic pole of the stator face the diameter of the magnet, and the length of the step motor is a length obtained by adding the length of the coil to the length of the magnet. Would be a good thing. Therefore, the size of the step motor is determined by the diameter and the length of the magnet and the coil. If the diameter and the length of the magnet and the coil are made very small, the step motor can be made very small. .

When the motor is stopped and the coil is initially energized, the force acting on the magnet by the magnetic flux generated from the coil does not go to the center of rotation of the magnet, and the rotation can be started stably by the holding means. As a result, the number of parts is very small, such as a magnet, a coil stator, and an output shaft, so that a motor can be configured and cost can be reduced.

Further, the magnet is formed in a hollow cylindrical shape, and an outer magnetic pole and an inner magnetic pole are opposed to the outer peripheral surface and the inner peripheral surface of the hollow cylindrical magnet, thereby providing an effective output as a motor. You can get it.

The magnet 101 is made of a plastic magnet material formed by injection molding as described above, so that the thickness of the cylindrical shape in the radial direction can be made extremely thin.

Therefore, the outer magnetic pole 118 of the stator 118
The distance between the inner magnetic poles 118a and 118b and the inner magnetic poles 118c and 118d can be made very small, and the magnetic resistance of the magnetic circuit formed by the coil 102 and the stator 118 can be made small. As a result, a large amount of magnetic flux can be generated with a small current, so that the output of the motor can be increased, the power consumption can be reduced, and the size of the coil can be reduced.

The output shaft 107 is fixed to the fitting portion 101e of the magnet 101 as a rotor by press fitting.
Since the magnet 101 is made of a plastic magnet formed by injection molding, it does not crack even when it is assembled by press-fitting, and it is easy to manufacture even a complicated shape having a fitting portion 101e having a small inner diameter at the center in the axial direction. Become. Further, since the output shaft 107 and the magnet 101 are assembled and fixed by press-fitting, it is easy to assemble and can be manufactured at low cost.

In particular, Nd-
A plastic magnet formed by injection molding a mixture of a Fe-B-based rare earth magnetic powder and a thermoplastic resin binder such as polyamide is used. Thus, while the bending strength of the compression molded magnet is about 500 kgf / cm ² , for example, when a polyamide resin is used as a binder material,
A bending strength of at least 00 kgf / cm ² can be obtained, and a thin cylindrical shape that cannot be obtained by compression molding can be formed. The thin cylindrical configuration improves the performance of the motor as described later.

Further, the shape can be made freely, the shape for fixing the rotor shaft 107, which cannot be obtained by compression molding, can be integrated, and a sufficient fixing strength of the rotor shaft can be obtained. Further, since the rotor shaft 107 is excellent in strength, it does not break even when the rotor shaft 107 is press-fitted or the like.

At the same time, since the fixed portion of the rotor shaft 107 is integrally formed, the magnet portion 1 is fixed to the rotor shaft portion.
01 is improved, the runout can be reduced, the gap distance between the magnet 101 and the stator 118 can be reduced, and the magnetic properties of the compression molded magnet of 8 MGOe or more can be reduced. Although the magnetic characteristics are about 5 to 7 MGOe, a sufficient output torque of the motor can be obtained.

In addition, the injection molded magnet has a thin resin film formed on its surface, so that the generation of rust is significantly less than that of the compression magnet, so that rust prevention treatment such as painting can be eliminated.

In addition, quality improvement can be achieved without the adhesion of magnetic powder, which is a problem with the compression magnet, and without the surface swelling that tends to occur during rust-proof coating.

The above motor is represented by the symbol M in the description of the whole flash device from FIG. The motor having the configuration described in this embodiment can rotate only in one direction, but can be a step motor having a very small diameter and length and a large output.

Next, the optical system of the flash light emitting device (illumination device) will be described.

In FIG. 7, CB is a photographing device. 1
1 is an optical panel of a flash light emitting device (illumination device), 21 is a release button, 22 is an operation switch for switching various modes of the camera, 23 is a liquid crystal display window for notifying a user of the operation of the camera, and 24 is an outside. The viewing window of the photometric device that measures the brightness of the light, 25 is the viewing window of the viewfinder,
26 is a cartridge loading lid for loading a cartridge type film, 27 is a lens barrel having a photographic lens 27a, and 28 is a photographic apparatus main body. In addition, since each function except a flash light emitting device is a well-known technique, detailed description is omitted here. Note that the mechanical components in the lighting device of the present invention are not limited to the above-described configuration.

In FIG. 8, reference numeral 11 denotes an optical panel in which an opening is exposed on a part of the outer surface of the photographing apparatus. As shown in FIG.
a is formed and the central part is a plane. On the other hand, on the back side, a plurality of rows of cylindrical lenses 11 having a negative refractive power in a direction substantially perpendicular to the direction of the refractive power of the front Fresnel lens.
b is formed.

In the same figure, reference numeral 12 denotes an optical prism for mainly controlling the light distribution characteristics in the vertical direction. A plurality of rows of cylindrical lenses 12a having a positive refractive power are formed in the light emitting portion. I have. The optical panel 11 and the optical prism 12 are made of an optical resin material having a high transmittance such as an acrylic resin. Reference numeral 13 denotes a flash discharge tube (xenon tube) that emits flash light. In addition, the inner surface is formed of a metal material such as bright aluminum having a high reflectance.

In the above-described configuration, as in the case of a conventionally known technique, for example, when the camera is set to the “strobe auto mode”, after the release button 21 is pressed by the user, The central processing unit determines whether or not to cause the flash light emitting device SB to emit light based on the brightness of the external light measured by the photometric device and the sensitivity of the loaded film.

When the central processing unit determines that the flash light emitting device emits light in the shooting condition, the central processing unit issues a light emission signal and transmits the signal via a trigger lead wire (not shown) attached to the reflector 14. To cause the flash discharge tube 13 to emit light. As for the emitted light beam, the light beam emitted in the direction opposite to the irradiation optical axis passes through the reflector 13, and the light beam emitted in the irradiation direction directly enters the optical prism 12 disposed on the front surface.
The light passes through the optical panel 11, is converted into a predetermined light distribution characteristic, and is irradiated on the subject side.

At this time, the light distribution characteristics in the vertical direction with respect to the subject are substantially determined by the optical prism 12 and the surface 11b on the light source side of the optical panel 11, and the light distribution characteristics in the left and right directions are on the subject side of the optical panel 11. The light is controlled by the formed Fresnel lens 11a and converted into a desired light distribution characteristic.

The present invention is particularly applicable to the optical panel 11 and the optical prism 1 according to the focal length changed by zooming when the photographing lens 27a of the photographing device CB is a zoom lens.
2 is changed. With this configuration, the light distribution characteristics in the vertical direction correspond to the photographing lens 27a. Hereinafter, the method of setting the optimum shape will be described in detail with reference to FIGS.

FIGS. 5 and 6 are radial vertical sectional views of the flash discharge tube 13 of the flash light emitting device SB. Numeral 1 denotes an optical panel for controlling light distribution, and numeral 2 denotes a light distribution mainly in the vertical direction. An optical prism for control, 3 is a cylindrical flash discharge tube, and 4 is a substantially semi-cylindrical reflector concentric with the flash discharge tube 3. Also,
The opposing surfaces of the optical panel 1 and the optical prism 2 have substantially overlapping shapes. FIG. 2 shows a state where the two members 1 and 2 are closest to each other, and FIG. 2 shows a state where the two members 1 and 2 are separated by a certain distance. The state is shown. 5 and 6 also show the tracing of the representative light beam emitted from the center of the inner diameter of the flash discharge tube 3 at the same time. In FIGS. 5 and 6, the positional relationship between the optical panel 1 and the optical prism 2 and the configurations and shapes of all optical systems other than light rays are the same.

In the first embodiment described here, the irradiation range can be continuously changed while the light distribution characteristics in the vertical direction are kept uniform, and the opening height in the vertical direction is minimized. It is composed. Hereinafter, the characteristics of the shape and the behavior of the light beam at that time will be described in detail.

First, in FIG. 5, the inner and outer diameters of the glass tube of the flash discharge tube 3 are shown. This type of flash device S
Regarding the actual light emission phenomenon of the flash discharge tube B, it is often the case that the light is emitted to the full inner diameter in order to improve the efficiency, and it can be considered that the light is emitted almost uniformly throughout the inner diameter of the flash discharge tube. However, in the design stage, in order to efficiently control the light emitted from this light source, rather than considering the light flux of the entire inner diameter at the same time, it is assumed that a point light source is ideally located at the center of the light source. Design the shape, then
If the correction is made in consideration of the fact that the light source has a finite size, it is possible to design efficiently.

Based on this concept, the present invention also considers the center 3a of the light emitting portion of the light source 3 as a reference point for shape determination, and sets the shape of each portion of the optical prism 2 in the following manner.

First, as a material of the optical panel 1 and the optical prism 2, it is suitable to use an optical resin material such as an acrylic resin in terms of moldability, cost, and optical characteristics. However, in addition to such characteristics, in this type of illuminating device, it is necessary to perform settings in consideration of the fact that a large amount of heat is generated simultaneously with the generation of light from the light source 3.

That is, it is necessary to select the optical material and set the heat radiation space in consideration of the heat effect and the shortest light emission cycle generated in one light emission.

At this time, what is actually most susceptible to the heat is the incident surfaces 2a and 2b of the optical prism 2 located closest to the light source 3, and the minimum distance between the light source 3 and the incident surface is first determined. You need to decide first. In the present embodiment, the emission angle θbdr from the light source center 3a is the emission optical axis L
The minimum distance between the first incident surface 2a for controlling an angle component close to a by direct refraction and the light source 3 is d, and the second incident surface for receiving light for controlling the total reflection of the angle component distant from the emission optical axis La. The minimum distance between the light source 2b and the light source 3 is defined as e, and the distance is regulated.

The specific numerical values in the present embodiment are as follows.

The outer diameter φ2.0 and the inner diameter φ1.
3, d = 0.5, e = 0.55 Next, the optical prism 2
Incident surface 2 that guides incident light to total reflection surfaces 2c and 2c '
b, 2b 'are determined. This second incident surface 2b,
In order to minimize the shape of the optical prism 2 as the shape of 2b ', it is desirable that the shape is a plane parallel to the optical axis.
That is, of the light beam emitted from the light source 3, a component traveling in a direction different from the emission optical axis is refracted once on this incident surface, but the smaller the angle of this surface, the greater the effect of refraction.
This is because the incident light can be once guided in a direction away from the optical axis by refraction, and the total length of the optical prism 2 can be reduced.

The inclination of the second incident surfaces 2b and 2b 'is
It is determined by the molding conditions of the optical prism 2. The smaller this angle, the more severe the actual molding conditions,
The ideal shape of the maximum value Φ of the angles of the surfaces 2b and 2b 'with the optical axis desirably exists in the following range regardless of whether the incident surfaces 2b and 2b' are flat or curved.

0 ≦ Φ <2 ° (1) The above range is a seemingly difficult set value, but the distance between the second incident surfaces 2b and 2b ′ is short, and the surface shape is a smooth surface. Because of this, it is a possible value.

By restricting the inclination of the second incident surfaces 2b and 2b 'in this manner, the opening area in the vertical direction can be minimized without lowering the efficiency.

Next, a method of determining the shape of the incident surface of the first incident surface 2a will be described. In the present embodiment, the shape of the first incident surface 2a is defined by the following method in order to significantly change the light distribution characteristics with the minimum shape.

That is, the components of the light beam emitted from the center 3a of the light source 3 that are directly incident on the incident surface 2a are all converted so as to be parallel to the light axis when viewed in the cross section shown in the figure. That is, the incident surface 2a is connected to the flash discharge tube 3
It has a focal length of the length from the light source center 3a to the incident surface 2a in consideration of the glass thickness of the lens, and is constituted by a cylindrical surface in which spherical aberration is corrected.

The surface shapes of the second incident surfaces 2b and 2b 'and the shapes of the total reflection surfaces 2c and 2c' are formed in the present embodiment by the following method in order to form an optical system having a minimum shape. Stipulates.

That is, the components incident on the incident surfaces 2b and 2b 'of the light flux emitted from the center of the light source 3 are parallel to the emission optical axis when they are all reflected on the total reflection surface and viewed in the cross section shown in the figure. Has been converted to.

Next, out of the light emitted from the flash discharge tube 3, the luminous flux directed to the rear of the emission optical axis has the shape of the reflector 4 concentric with the flash discharge tube 3 as shown in FIG. Therefore, after being reflected by the reflector 4, the light is again incident on the flash discharge tube 3, passes through the approximate center of the flash discharge tube 3, and is guided forward of the emission optical axis. The state of light rays after returning to the center of the light source is the same as described above.

As described above, the light beam emitted from the center 3a of the light source 3 is refracted by the incident surface 2a of the optical prism 2 or refracted by the incident surfaces 2b and 2b 'and totally reflected surfaces 2c and 2c'. After being reflected by the light source, all of the illustrated cross sections are converted into components parallel to the emission optical axis, and are guided to the emission surface 2d.

At this time, the depth of the optical prism 2 is extended to such a length that the component closest to the direct incidence surface 2a among the components incident from the second incidence surfaces 2b and 2b 'can be totally reflected. It is composed.

Therefore, the components incident from the second incident surfaces 2b and 2b 'do not directly hit the light exit surface 2d, so that the efficiency is improved and the control can be performed with the minimum size.

When the inner diameter of the light source 3 is sufficiently small, or when the optical prism 2 can be considered to be sufficiently large with respect to the light source 3, light collection control can be performed with a considerably high efficiency by the above method. However, from the viewpoint of actual light distribution characteristics, the size of the inner diameter, which is the effective light emitting portion of the light source, is not so small as to be negligible. Due to this effect, all the light fluxes passing through the optical prism 2 are components parallel to the emission optical axis. , But is converted to a distribution that spreads in a certain range in the vertical direction.

In particular, a control surface near the light source, for example,
The reflected light flux at the rear end of the prism close to the light source even on the incident surface 2a that directly controls the light flux emitted from the light source and the total reflection surface 2c have a large effect. The light distribution has a spread.

Next, the position of the boundary surface of the incident surface 2a will be described. As described above, the conditions for efficiently forming the minimum optical system in consideration of the influence of heat on the resin material of the incident surface 2a and the minimum optical system include the first incident surface 2a and the second incident surface. It is desirable that the angle θbdr of a straight line LP connecting the coordinates of the intersection of 2b and 2b ′ and the center 3a of the light source 3 be within a certain range.

That is, if this angle is smaller than the predetermined angle, the distance to the first incident surface 2a increases, so that the light is hardly affected by the size of the light source. The angle of incidence on 2b and 2b 'increases, and loss due to surface reflection on the incidence surface is likely to occur.

On the other hand, if this angle is larger than the predetermined angle, the incident light flux from the first incident surface 1a which needs to be controlled on the surface close to the light source increases, and it is difficult to obtain a sufficient light collecting effect depending on the size of the light source. .

Therefore, the angle θbdr of the straight line LP is
It is desirable to be within the following numerical range.

That is, the boundary between the incident surface 2a for controlling the light directed toward the front of the optical prism 2 only by refraction and the incident surfaces 2b and 2b 'for guiding the light mainly emitted obliquely forward from the light source to the total reflection surface. Assuming that the inclination θbdr is a line segment connecting the line and the center of the light source, it is preferable that the inclination angle be in the range of 25 ° ≦ θbdr ≦ 45 ° (2) from the viewpoint of efficiency and light collection control.

Next, the incident surfaces 2b, 2b of the optical prism 2
The shape of the intersection between b ′ and the total reflection surfaces 2c and 2c ′ will be described.

In the first embodiment of the present invention, the shape is such that the intersection points directly intersect to form an acute angle, and the intersection point and the center position 3a of the light source substantially coincide with each other in the front-rear direction (optical axis direction). Is configured.

Such a configuration is effective for efficiently controlling the light distribution while minimizing the shape of the optical prism 2. That is, for example, if a surface having different characteristics, for example, a surface perpendicular to the optical axis is formed between the incident surfaces 2b, 2b 'and the total reflection surfaces 2c, 2c', the surface is regarded as an optical system. It does not function, and leads to an increase in the size of the optical prism 2 in the vertical and depth directions, which is not a desirable shape from the viewpoint of miniaturization.

On the other hand, in this embodiment, the position of this intersection and the position in the front-rear direction of the light source center 3a are made coincident. However, this is necessary in order to make the entire optical system as small as possible and not to lower the efficiency. The shape is closely related to the angle of total internal reflection within the prism and the shape of the reflector according to the light source.

In other words, when the total reflection in the optical prism 2 is set such that the angles of the incident surfaces 2b and 2b 'are around 0 ° and the optical prism 2 is made of a resin material, the refractive index is about 1.5. Extending the intersection of the prism surfaces further back,
A component is emitted after the prism without being totally reflected. This is more likely to occur as the inner diameter of the light source 3 increases, and a part of the component emitted from the front of the light source center 3a escapes from the total reflection surfaces 2c and 2c '.

In this embodiment, the total reflection surfaces 2c and 2c '
Although the reflecting surface for returning the light exiting back to the inside of the optical prism 2 is formed on the extension of the reflecting umbrella 4, the light is absorbed by the reflecting umbrella 4 and the surface is reflected by the emission and re-incidence. Light loss and the like are likely to occur.

Therefore, a configuration is adopted in which the reflector is extended to the maximum size that effectively functions as the reflector 4, and then the light is incident on the optical prism surface. The shape of the reflector of the present embodiment is a semi-cylindrical shape concentric with the flash discharge tube 3 as a light source, and the front end of the opening of the reflector is substantially aligned with the front-rear direction of the light source center 3a.

Also, the rear end of the optical prism 2 is arranged so as to be substantially coincident with the center 3a of the light source so that there is no gap with respect to the reflector 4.

As described above, the reason why the shape of the reflector is made concentric with the center of the light source and the front end thereof coincides with the center of the light source is as follows.
First, there is an effect on the glass part of the flash discharge tube.

In a very small light-emitting optical system such as the present embodiment, it is necessary to reflect the light beam directed backward from the light source by the reflector 4 and direct the light beam in the irradiation direction.
Since the entire optical system is downsized, it is impossible to control all the reflected light from the reflector 4 by turning the outside of the flash discharge tube 3 without passing through the inside of the flash discharge tube 3 in terms of space. It is necessary to take an optical path for re-entering the glass tube of the flash discharge tube.

At this time, the component re-entering the flash discharge tube 3 is affected by refraction and total reflection in the glass part of the flash discharge tube 3 and greatly affects the incident component to the optical prism 2 disposed in front. give. This tendency is remarkable especially when the thickness of the glass is large.As a result, if the shape of the light source and the shape of the reflector do not properly correspond to each other, the distribution of the reflected light from the reflector becomes wider than necessary. Become.

Therefore, when the reflector is formed in a cylindrical shape corresponding to the shape of the light source and concentric with the cylindrical glass portion of the flash discharge tube, the incident angle upon re-entering the flash discharge tube becomes small. Therefore, the loss due to surface reflection on the surface of the glass tube is small, and the component of the luminous flux after the re-incident that is totally reflected in the glass tube is reduced, so that the efficiency can be increased. In particular, when there is a small gap with respect to the light source, the angle change after reflection by the reflector is small, which is very effective.

The reason why the reflecting umbrella 4 is formed in a semi-cylindrical shape which substantially coincides with the position of the light source center 3a is that if the reflecting umbrella 4 is made longer, the reflecting umbrella will move forward.
Since light is trapped in the reflector, efficiency is reduced, which is not preferable.

On the other hand, if the reflector 4 is made shorter than the light source center 3a, the rear end of the optical prism 2 extends to the rear as described above, which not only causes a loss of light amount but also increases the size of the entire optical system. This is not a preferable configuration.

The reflecting surface of the reflecting umbrella 4 goes around to the rear of the total reflecting surfaces 2c and 2c 'of the optical prism 2 and almost to the front end of the flash tube 3 as a light source. It has substantially the same shape as the reflecting surfaces 2c and 2c '.

The reason is that the inner diameter of the glass tube, which is the light emitting portion of the flash discharge tube 3, also exists on the front side from the light source center 3a, but a part of the light beam emitted from the front side is partially reflected by the total reflection surface 2c.
This is to prevent the light from being totally reflected at 2c 'and not being reflected outside. In this way, by making the shape substantially the same as the total reflection surface and arranging it immediately behind the total reflection surface,
The effect is almost the same as that of the total reflection surfaces 2c and 2c ', and it is possible to efficiently provide a uniform distribution in a required irradiation range.

The optical prism 2 is formed by the method described above.
By defining the shape of (1), it is possible to form the smallest and most efficient light-collecting optical system in consideration of the heat generation condition of a given light source.

The variable irradiation angle mechanism according to the present invention is required by gradually diffusing the condensed light beam at a certain fixed rate based on the small condensing optical system (1, 2, 4). It is characterized in that it is controlled to match the light distribution characteristics.

For this reason, it is possible to extremely reduce the size in the most condensed state, which has conventionally caused a large size, and to linearly change the condensing operation. The characteristics required for the illumination angle variable illumination optical system can be efficiently achieved.

In addition, since the amount of movement due to the irradiation angle displacement at this time is extremely smaller than that of the conventional method, it is possible to design a space-efficient illumination optical system suitable for a small photographing apparatus. Can be configured at a low cost without requiring a large number of additional parts.

The most characteristic method of changing the irradiation angle according to the present invention will be described below with reference to FIGS.

FIG. 5 shows the most condensed state, and FIG.
Shows the state where the irradiation area is the widest. First,
On the light exit surface 2d of the optical prism 2, a cylindrical lens (a pattern surface having a refractive power) 2e having a positive refractive power with a focal length D and a spherical aberration corrected as an optical means is disposed at a pitch P with an axis of the flash discharge tube 3 at a pitch P. A plurality of rows are formed in parallel with the direction (perpendicular to the paper surface).

On the other hand, the surface of the optical panel 1 facing the optical prism 2 is a negative means as an optical means that overlaps with the plurality of cylindrical surfaces of the optical prism 2 (the refractive power is canceled out) in a state of being in close contact. A cylindrical lens 1a having a refractive power (pattern surface having a refractive power) 1a is formed at the same pitch P as the cylindrical lens 2e of the optical prism 2.

As shown in FIG. 5, when the optical prism 2 and the optical panel 1 are almost in close contact with each other, a cylindrical lens 2 e having a positive refractive power formed on the light exit surface 2 d of the optical prism 2 and the optical panel 1 are provided. The power of the cylindrical lens 1a having the negative refractive power is canceled out, and the light is emitted from the optical panel 1 while keeping the characteristics collected by the optical prism 2. This state corresponds to the most focused state with the variable irradiation angle.

Next, the diffusion state shown in FIG. 6 will be described.
FIG. 6 shows an optical panel 1 fixed to an external part of a photographing apparatus, in which a light emitting unit main body including an optical prism 2, a flash discharge tube 3, and a reflector 4 is integrally moved. In the figure, the maximum movement amount is set to L, and the optical panel 2 has been moved to a position substantially coincident with the focal length D of the cylindrical lens.

As shown, the optical panel 1 is different from that of FIG.
The luminous flux after emission is spread uniformly at a certain rate,
Even if the size of the light source is taken into consideration, it can be easily imagined that the light is uniformly illuminated with a certain spread over the required illumination irradiation area.

Next, the specific shape of the irradiation angle variable section for changing the degree of diffusion will be described with reference to FIGS. In order to clarify the explanation, the ray tracing diagram in FIG.
Only the component incident on the first incident surface 6a of FIG.
The light beams incident from the second incident surfaces 6b and 6b 'also exhibit substantially the same characteristics.

First, FIG. 9 shows that the refracting power of the cylindrical lens 6e formed on the light exit surface 6d of the optical prism 6 is made stronger than that of the first embodiment. To clarify the explanation, each cylindrical surface has a spherical aberration. Are not corrected.

On the other hand, FIG. 10 shows a case where the refractive power of the cylindrical lens 8e is weakened, and in this case also, the cylindrical lens 8e is constituted by a cylindrical surface whose spherical aberration is not corrected. As can be seen from the illustrated example, if the refractive power of the cylindrical lens 6e provided in the optical prism 6 as shown in FIG. 9 is too large, a component that causes total reflection on the light exit surface 6d is generated. That is, this is a component indicated by a dotted line in FIG. 9, and this component takes an optical path that returns to the light source side again, and many components do not exit from the light exit surface 6d again, and the efficiency is reduced.

In the example shown in FIG. 9, only the light beam emitted from the light source center 3a is shown. However, actually, light is emitted from the entire inner diameter of the flash discharge tube, and the amount of loss is further increased. .

On the other hand, as shown in FIG. 10, when the refractive power of the cylindrical lens 8e is weaker than necessary, the loss component due to total reflection is eliminated and the efficiency is improved. Performance is inadequate for the purpose of the present invention to cause irradiation changes. For this reason, it is desirable that the setting of the refractive power of the optical prism and the optical panel be within a predetermined range.

On the other hand, the amount of movement of the optical prism and the optical panel during zooming is not only limited by the mechanical space, but also by the accuracy of stopping the drive system, the accuracy of detecting the amount of movement, the hysteresis in the direction of movement, and the amount of movement. It is necessary to consider the amount of change in light distribution characteristics with respect to an error, and the like, and the configuration of the present invention can limit the range of a practical shape to some extent. Hereinafter, this desirable setting range will be described.

First, as shown in the first embodiment shown in FIG. 5 and FIG. 6, a case where an uneven cylindrical surface whose shape is substantially overlapped with the optical prism 2 and the optical panel 1 is formed on the opposing surfaces. In order to simplify the description, first, a case where a cylindrical surface is used as a cylindrical lens will be described.

The change in the irradiation angle in this case is substantially determined by the refractive power of the convex lens (positive lens) formed on the optical prism. As described above, the change in the irradiation angle is increased when the refractive power is increased, but the light component that cannot be emitted from the light exit surface 2d due to the total reflection increases. If the size of the light source is originally sufficiently smaller than the size of the entire optical system, the light is converted parallel to the emission optical axis like a light beam emitted from the center of the light source shown in the figure.

In this case, the condition that the total reflection occurs and the loss starts to occur is that the inclination around the small convex lens group (positive lens group) 52e provided on the light exit surface of the optical prism 52 is as follows.
Since the critical angle is exceeded, a necessary condition is that the inclination of the tangent line 2ep around the cylindrical lens 52e be less than the following range.

Here, assuming that the refractive index of the material of the optical prism 52 is N and the maximum value of the inclination of the tangent line 2ep of the small lens 52e to the optical axis La is αmax, αmax> 90 ° −Sin ⁻¹ (1 / N)... (3) is desirable.

However, the range shown here is a necessary condition, and since the light emitting portion of the flash discharge tube is not a point light source but has a certain size, the actual light exit surface of the optical prism is An angle component having a certain extent will arrive.

For this reason, even if the above range is satisfied, there is a possibility that a loss due to total reflection may occur, and the refractive power of the convex lens is the weakest refractive power capable of obtaining the required wide irradiation range. Setting the refractive index is desirable from the viewpoint of efficiency.

Next, a desirable setting area of the present invention will be described with reference to the first embodiment shown in FIGS.
As shown in the figure, when the maximum separation distance between the cylindrical lenses 2e and 1a is L, the pitch interval between the cylindrical lenses is P, and the paraxial focal length of the cylindrical lens 2e is D, the relationship between them is as follows. When it is regulated to, an efficient illumination angle variable illumination optical system having both size and optical performance can be formed.

First, the relative distance L between the optical prism 2 and the optical panel 1 for changing the irradiation angle is desirably in the following range when the unit is mm.

0.5.ltoreq.L.ltoreq.4.0 (4) The minimum value 0.5 of L shown here is a numerical value determined by a mechanical restriction accompanying the movement. That is, it is difficult as a practical problem to translate the panel surface having a relatively wide optical effective range and keep the panel interval uniform as in the present invention.

That is, a mechanical holding method is difficult, such as a partial inclination depending on the guide method, a hysteresis due to the reciprocating motion, and an inclination due to a difference in posture depending on the holding method. There has been a problem that optical characteristics are significantly different due to errors.

If the panel interval is narrower than necessary, a control method of the drive system and a special control method and detection method for detecting the panel interval amount are required, and it is difficult to configure the panel at low cost. I will.

For this reason, in the present invention, the minimum value of the full stroke required for varying the irradiation angle between the optical prism 2 and the optical panel 1 is set to 0.5 m
It is considered that the irradiation angle variable mechanism is inexpensive if it is at least larger than this value.

On the other hand, the maximum value L of 4.0 mm is a numerical value regulated by the size of the overall shape of the illumination optical system.
That is, miniaturization of the illumination optical system is important for the purpose of the present invention, and if the distance between the optical prism 2 and the optical panel is extended more than necessary, there arises a problem that the entire optical system becomes too large.

The movement amount permitted as the irradiation angle variable mechanism according to the method of the present invention is sufficient when the movement amount is sufficiently smaller than the movement amount of the conventional zoom strobe. This is contrary to certain miniaturization, and the attractiveness is considerably reduced. Therefore, the maximum value of the movement amount is restricted to the above value.

Next, the rate of change of the irradiation angle will be described. In order to regulate the change of the irradiation angle, it is desirable to regulate the relation between the refractive power of the cylindrical lens 2e using the paraxial focal length D and the pitch interval P of each lens by the following equation.

P / 2 ≦ D ≦ 2 × P (5) The above equation regulates the general shape of each cylindrical lens. The meaning of the above equation will be specifically described with reference to the shape shown in the first embodiment.

First, the paraxial focal length D indicating the refracting power of the cylindrical lens 2e is a part for controlling the condensing and diffusion of the illumination optical system, and the optical characteristics of the irradiation angle variable are almost determined by this part. The shorter the distance, the larger the change in irradiation angle with a small amount of movement, and the longer the focal length, the more smoothly the change in irradiation angle.

For this reason, there is a certain degree of freedom depending on the mechanical configuration of the zoom system to be employed, and there is no optimum value. That is, if the mechanical control system gives priority to miniaturization and it is possible to accurately control the position even if it costs a little, it is desirable to make the focal length D short, and to give priority to optical performance and cost, If the configuration is such that the conversion can be tolerated, it is reasonable to set the focal length to be long, so that the irradiation angle variable optical system can be configured more efficiently and efficiently.

On the other hand, in the actual control of the irradiation angle,
Similar to the focal length of the cylindrical lens, there is a close relationship with the pitch interval P corresponding to the size of the opening of each cylindrical lens.

That is, after the light emitted from the center of the light source is made substantially parallel to the optical axis by the optical prism 2, the degree of diffusion is adjusted by a cylindrical lens provided on the emission surface. The degree of diffusion changes depending on the width of the opening. If the opening is wide, it can be converted into a light distribution with a large degree of diffusion, and if the opening is narrow, only a light distribution with a small degree of diffusion can be obtained.

If the opening is wider than necessary, as described in the above description, the total reflection component on the lens surface increases, and it is not possible to perform efficient irradiation angle variation. Furthermore, if the opening is narrower than required, no matter how long the movement amount is, the required irradiation angle cannot be widened.

From the above, it is necessary to satisfy the condition of the range shown in the above equation (5) in order to realize this kind of illumination angle variable illumination device.

In the above equation, the relationship with the pitch interval P is shown based on the paraxial focal length D of the cylindrical lens. When the paraxial focal length D is equal to or less than P / 2, the change in the irradiation angle is reduced. This is a relational expression indicating that it is not preferable because the control is difficult because it is too large and the loss due to total reflection increases, and when the paraxial focal length is more than 2P, the irradiation angle change is small and the size becomes large, which is not preferable. .

On the other hand, on the object side of the optical panel 1, FIG.
As shown in FIG. 8, a Fresnel lens surface 11a is formed to collect light in the axial direction of the flash discharge tube.

In the first embodiment of the present invention, the relative movement between the optical prism and the optical panel allows light-condensing and diffusion to be efficiently performed on the radial cross section of the flash discharge tube shown in FIGS. In the axial direction of the discharge tube, the light source is too long, and it is difficult to efficiently collect light.

In this embodiment, the light is condensed in the axial direction of the flash discharge tube using the Fresnel lens 11a provided on the object side of the optical panel 11. As shown in the figure, the Fresnel lens surface is not formed entirely on the entire surface of the optical panel, but is formed only on a portion outside the effective arc length of the flash discharge tube.

This is because if it is within the effective arc length of the flash discharge tube, the light distribution characteristics in the vertical direction will be disturbed and the efficiency will be reduced. In addition, a Fresnel lens will be formed at the center of the flash discharge tube. However, the distance between the light source and the Fresnel lens surface is so short that efficient light collection cannot always be performed.

By providing Fresnel lenses on both sides of the optical panel as shown in FIG.
Since the angle of incidence of the light beam can be limited to some extent, it is possible to collect light efficiently.

However, the light collection in the axial direction of the flash discharge tube can hardly be changed by the relative movement between the optical prism and the optical panel as described above. For this reason, in the present embodiment, by forming the Fresnel lens shown in the figure, a shape that condenses light to the point where light distribution characteristics corresponding to the widest required irradiation range is obtained is determined.

As described above, the illumination device with a variable irradiation angle according to the present invention effectively functions in the cross section in the radial direction of the flash discharge tube in this embodiment when the light source is sufficiently small with respect to the optical system. However, the light source itself does not function effectively with respect to the optical system. Therefore, an ideal light source is a form close to a point light source, and the ideal shape is that the optical prism and the optical panel can also be formed in a rotationally symmetric shape.

However, although the ideal shape can be obtained only with a certain cross section as described above, the overall shape is superior to the conventional system due to the downsizing of the overall shape and the high efficiency utilizing total reflection. Light distribution characteristics and optical characteristics can be obtained.

Next, the set values of the illumination optical system according to the first embodiment will be described with reference to FIGS. 5 and 6 while applying specific numerical values.

First, the overall shape of the optical system will be described. In FIG. 6, the total length f of the optical system is f
= 9.4 mm, f = 7.9 mm in close contact, and the aperture g of the optical prism 2 is g = 10.0 mm. Compared with a conventional zoom strobe, the total volume is:
The size is reduced from 1/3 to 1/4.

Next, regarding the configuration of the diffusion section, the cylindrical pitch P of the optical prism is constant in the first embodiment, and P = 1.5 mm. Optical prism,
The maximum moving distance L of the light emitting unit including the flash discharge tube and the reflector to the optical panel is L = 1.5 mm, and the focal length D of each cylindrical lens is D = 1.75 mm.
The shape is set as constant.

Each of the above values satisfies the values near the center of the above-mentioned relational expressions (4) and (5), and thus has an almost ideal shape.

Also, the cylindrical lens surface having a negative refractive power formed on the optical panel 1 has a shape in which the irregularities are completely opposite to those of the cylindrical lens surface provided on the optical prism 2 as shown in FIG. When the lenses are brought into close contact with each other, the cylindrical lens has a shape in which the refracting power is just canceled, so that the light beam is emitted while maintaining the characteristics collected in the optical prism, and an extremely efficient optical system can be formed.

In the present embodiment, each cylindrical lens has an aspherical shape without spherical aberration. Therefore, components emitted from the center of the light source can be efficiently collected and diffused without being totally reflected on the cylindrical lens surface.

Further, by forming the cylindrical lens in such a shape that spherical aberration is corrected, an extremely efficient optical system can be formed when the light source is sufficiently small with respect to the optical prism.

The cylindrical lens provided integrally with the light exit portion of the optical prism may be formed separately from the optical prism.

In this embodiment, an anamorphic lens having a refractive power in the axial direction of the light source means 3 may be used instead of the optical prism and the cylindrical lens provided on the optical panel. Then, the refracting powers of the anamorphic lenses of the optical prism and the optical panel may be offset each other.

FIG. 11 is a perspective view of the strobe device of the present invention. 12 is a top view of FIG. 11, and FIG. 13 is a bottom view of FIG.

In the figure, M is the motor described above, 10 is a pinion gear attached to the output shaft of the motor M, 11
Is an eccentric shaft rotatably attached to a main body (not shown) at portions 11b and 11c, the center of rotation is the portions 11b and 11c, and the gear portion 11a is a pinion gear 1
0 is engaged. In addition, the rotation center 11b and 11
The cylindrical portion 11d is eccentric with respect to the portion c.

Reference numeral 12 denotes a photoreflector which is attached to a main body (not shown) and detects a hole 11e on the plane of the gear portion 11a of the eccentric shaft 11. Thereby, the rotational position of the eccentric shaft 11 can be known.

Reference numeral 13 denotes a 13ab part and 1
A drive lever rotatably attached at the portion 3b, which is slidably fitted to the eccentric cylindrical portion 11d of the eccentric shaft 11 by a fitting groove 13c provided on one arm. The pin 1 of the optical panel 1 is provided by the fitting groove 13d provided.
c is slidably fitted.

The optical panel 1 has a guide portion 1a having a circular hole and an auxiliary guide portion 1b having a long hole. The respective holes are a guide rod 14 and an auxiliary guide rod to which a main body (not shown) is fixed. The optical panel 1 is slidably fitted with the optical panel 15 and is configured to be movable in the direction of arrow A.

The rotation of the eccentric shaft 11 causes the drive lever 13 to rotate, and the optical panel 1 is positioned at the position corresponding to the amount of rotation by the arrow A.
The relative distance between the optical panel 1 and the optical prism 2 positioned in the direction is changed. Eccentric shaft 11,
Changing means is constituted by the drive lever 13 and the like. Eccentric shaft 1
1 corresponds to a rotating member in the claims, and the drive lever 13 corresponds to a drive member.

The photoreflector 12 detects the hole 11e on the plane of the gear portion 11a of the eccentric shaft 11 and controls the rotation amount of the motor M thereafter to position the optical panel 1 at a desired position and to adjust the irradiation angle. You can make changes.

The optical panel 1 is moved in the direction of arrow A by rotating the eccentric shaft 11 in one direction. For this reason, even if the control of the motor is poor, there is no collision between the parts, so that there are few failures.

Since the motor M has a very small diameter as described above, the motor M can be arranged along the inclined surface 2e of the optical prism 2 as shown in FIG. 12, and the lateral dimension N of the strobe device can be suppressed. . Further, since the length of the motor M is very small as described above, the height H of the strobe device can be kept small even if the motor M is disposed vertically when viewed from the front. You can do it. Since the irradiation angle of the strobe device can be changed by the motor having such a simple structure, the motor for changing the focal length of the photographing lens barrel or the optical prism of the illumination device can be rotated or linked with the movement of the photographing lens barrel. This eliminates the need for a complicated mechanism connecting means for changing the position of parts, and increases the degree of freedom in the layout of the lighting device.

Next, a second embodiment of the present invention will be described. 14 to 16 are schematic views of a main part of the motor according to the present invention.

FIG. 14 is an exploded perspective view of the step motor, FIG. 15 is a sectional view in the axial direction after the step motor is assembled, and FIG. 16 is a sectional view taken along line FF of FIG.

In this embodiment, the outer magnetic pole 1 of the stator 118 is
18a and 118b are further extended to constitute the holding means.

The outer magnetic poles 118a and 118b are connected to the magnetized portions 118a1 and 11a facing the inner magnetic poles 118c and 118d.
8b1 and extended partial extending portions 118a2 and 118b2 corresponding to the positioning stator. Extension 118a
2 and 118b2 do not face the inner magnetic poles 118c and 118d.
Almost no magnetization compared to a1 and 118b1, and no driving force is generated. As shown in FIG. 14, magnet 101 has magnetized portions 118a1 and 118b of outer magnetic poles 118a and 118b.
The magnetization phase is changed between a portion E facing 1 and a portion D facing the extending portions 118a2 and 118b2.

As a result, as shown in FIG. 16 (a), when power is not supplied to the coil 102, the portion E of the magnet 101 is magnetized by the coils 102 of the outer magnetic poles 118a and 118b.
2 is held at a position shifted from a straight line connecting the rotation center Q3 of the magnet 101 and the rotation center Q3. Extensions 118a2, 118b
2 does not face the inner magnetic poles 118c and 118d, so that the magnetized portions 118a1 and 118
Since no magnetizing force is generated compared to b1 and no driving force is generated, the magnetic flux generated from the coil 102 by energizing the coil 102 substantially passes between the magnetized portions 118a1 and 118b1 and the inner magnetic poles 118c and 118d. The acting force can stably start rotation without going to the center of rotation of the magnet.

The extension portions 118a2 and 118b2
Even when the current is supplied to the coil 02, it is hardly magnetized as compared with the magnetized portions 118a1 and 118b1, and a stable output can be obtained without substantially affecting the driving force generated by the current supplied to the coil 102.

Next, the operation of the step motor will be described. When the coil 102 is energized from the state of FIG. 16A to make the outer magnetic poles 118a and 118b of the stator 118 N poles and the inner magnetic poles 118c and 118d are magnetized to S poles, the magnet 101 which is a rotor rotates counterclockwise. Rotate, Figure 16
The state shown in FIG.

The extension portion 118 corresponding to the positioning stator
Since a2 and 118b2 are hardly excited by the coil 102, the magnetized portion of the magnet 101, the outer magnetic poles 118a and 118b of the stator 118, and the inner magnetic pole 1
The position of the magnet is determined by the excitation state of the coils 102 of 18c and 118d, and the state shown in FIG.

When the current supply to the coil 102 is stopped in this state, the coil 101 is stabilized by the magnetic force of the magnet 101 (FIG. 16C).
The state shown in is shown.

Next, the energization of the coil 102 is reversed so that the outer magnetic poles 118a and 118b of the stator 118 are set to S poles and the inner magnetic poles 118c and 118d are excited to N poles.
The magnet 101, which is a rotor, further rotates counterclockwise, and becomes a state shown in FIG.

Thereafter, by sequentially switching the energizing direction to the coil 102, the magnet 101 as a rotor rotates to a position corresponding to the energizing phase.

In this embodiment, the holding means is constituted by magnets and extending portions 118a2 and 118b2 integrally formed with the outer magnetic poles 118a and 118b of the stator 118. As a result, there are advantages in that the number of parts is reduced, the assembly is easy, and the cost can be reduced.

Further, as in the first embodiment, the diameter of the step motor only needs to be large enough to allow the magnetic poles of the stator to face the diameter of the magnet. It is sufficient that the length is the length obtained by adding the length of 102. For this reason, the size of the step motor is determined by the diameter and length of the magnet and the coil. If the diameter and length of the magnet and the coil are made very small, the step motor can be made very small.

At this time, if the diameters and lengths of the magnet and the coil are made very small, it becomes difficult to maintain the accuracy as a step motor. However, this is because the magnet is formed in a hollow cylindrical shape, The problem of the accuracy of the step motor is solved by a simple structure in which the outer magnetic pole and the inner magnetic pole of the stator are opposed to the outer peripheral surface and the inner peripheral surface of the cylindrical magnet.

At this time, not only the outer peripheral surface of the magnet,
If the inner peripheral surface of the magnet is divided in the circumferential direction and magnetized,
The output of the motor can be further increased. Quality improvement can be achieved without surface swelling.

[0211] In addition to the motor described above, a motor proposed in, for example, Japanese Patent Application Laid-Open No. 9-331666 may be used.

In the proposed motor, a rotor composed of permanent magnets which are equally divided in a circumferential direction and are alternately magnetized to different poles is formed in a cylindrical shape, and a first coil and a rotor are formed in the axial direction of the rotor. And a second coil are arranged in order, and the first outer magnetic pole and the first inner magnetic pole excited by the first coil are opposed to the outer peripheral surface and the inner peripheral surface of the rotor, and are excited by the second coil. The second outer magnetic pole and the second inner magnetic pole are configured to be opposed to the outer peripheral surface and the inner peripheral surface of the rotor, and the rotating shaft that is the rotor shaft is taken out of the cylindrical permanent magnet.

In the motor having such a structure, the first coil, the rotor, and the second coil are sequentially arranged in the axial direction of the rotor. Although it tends to be longer than this, a motor having a smaller diameter and a higher output than other types of motors can be used, and the size of the strobe device in the lateral direction N can be reduced.

Even if the type of motor is an ordinary type of DC motor or step motor, the optical panel 1 is moved in the direction of arrow A by rotating the eccentric shaft 11 in one direction, so that the motor control is poor. Even though the parts do not collide with each other, there are few failures, and the irradiation angle of the strobe device can be changed with a simple configuration,
A motor for changing the focal length of the taking lens barrel or a complicated mechanism for rotating the optical prism of the illuminating device or changing the position of the optical component in conjunction with the movement of the taking lens barrel eliminates the necessity of the connecting means. This has the effect of increasing the degree of freedom in device layout.

The motor according to the present invention is applicable to driving various optical members and members of optical equipment.

[0216]

According to the present invention, there are provided (a-1) an illumination device with a variable illumination angle capable of changing the illumination angle by extremely miniaturizing the overall shape of the illumination optical system, and an imaging device using the same. Can be achieved.

(A-2) An illumination device with a variable illumination angle capable of making the light distribution characteristics uniform at each zoom point and reducing the amount of movement due to the variable illumination angle, and an imaging device using the same. Can be achieved.

(A-3) An Irradiation Device with a Variable Irradiation Angle and a Simple Mechanism that Does Not Need to Take Mechanical Interlock from the Photographic Lens Barrel and That Is Extremely Small, Thin and Light An imaging device using the above can be achieved.

(A-4) To achieve an illumination device with a variable irradiation angle capable of obtaining uniform light distribution characteristics at each zoom point by using energy from a light source with high efficiency and a photographing device using the same. Can be.

(A-5) Since the irradiation angle of the strobe device can be changed by a motor having a simple configuration, the motor for changing the focal length of the photographing lens barrel or the optical prism of the illumination device is linked to the movement of the photographing lens barrel. This eliminates the need for connecting means of a complicated mechanism for rotating or changing the position of the optical component, and increases the degree of freedom of the layout of the lighting device.

(A-6) Since the diameter of the motor M is very small as described above, it can be arranged along the inclined surface 2e of the optical prism 2 as shown in FIG. Can be suppressed. Further, since the length of the motor M is very small as described above, the height H of the strobe device can be kept small even if the motor M is disposed vertically when viewed from the front. You can do it.

(A-7) The method of moving the optical panel 1 in the direction of the arrow A is performed by rotating the eccentric shaft 11 in one direction, so that even if the control of the motor is poor, the components will not collide with each other, so that there is little failure. .

(A-8) Since the irradiation angle of the strobe device can be changed with a simple configuration, the motor for changing the focal length of the taking lens barrel or the optical prism of the lighting device is rotated in conjunction with the movement of the taking lens barrel. There is an effect that the necessity of a connecting means of a complicated mechanism for changing the position of the optical component is eliminated, and the degree of freedom of the layout of the lighting device is increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a step motor according to the present invention.

FIG. 2 is a sectional view of the step motor shown in FIG. 1 in an assembled state.

FIG. 3 is an explanatory view of a rotation operation of a rotor of the step motor shown in FIG. 2;

FIG. 4 is a cross-sectional view illustrating a positional relationship between a stator and a magnet.

FIG. 5 is a longitudinal sectional view of a flash light emitting device in a discharge tube radial direction showing a light distribution in a focused state according to the first embodiment of the present invention.

FIG. 6 is a vertical sectional view of a flash light emitting device in a radial direction of a discharge tube showing a light distribution in a diffused state according to the first embodiment of the present invention.

FIG. 7 is a perspective view of a camera to which the flash light emitting device according to the first embodiment of the present invention is applied.

FIG. 8 is a perspective view including a partial cross section of a main part of an optical system of the flash light emitting device according to the first embodiment of the present invention, as viewed from the front;

FIG. 9 is a longitudinal sectional view of a flash light emitting device in a radial direction of a discharge tube for describing Embodiment 1 of the present invention.

FIG. 10 is a longitudinal sectional view of another flashlight emitting device in a radial direction of a discharge tube for describing Embodiment 1 of the present invention.

FIG. 11 is an overall perspective view of a strobe device according to the first embodiment of the present invention.

FIG. 12 is a top view of the entire flash device according to the first embodiment of the present invention.

FIG. 13 is an overall bottom view of the strobe device according to the first embodiment of the present invention.

FIG. 14 is an exploded perspective view of a step motor according to a second embodiment of the present invention.

15 is a cross-sectional view of the step motor shown in FIG. 14 in an assembled state.

FIG. 16 is an explanatory view of the rotation operation of the rotor of the step motor shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical panel 2 ... Optical prism 3 ... Flash discharge tube 4 ... Reflective umbrella 21 ... Release button 22 ... Camera mode changeover switch 23 ... Liquid crystal display window 24 ... ... Peep window of photometric device 25... Peep window of finder 26... Cartridge loading lid 27... Lens barrel 28... Photographing apparatus body 10... Pinion gear 11. Reflector 13 Drive lever 14 Guide rod 15 Auxiliary guide rod M Motor 101 Magnet 102 Coil 107 Output shaft 118 Stator 120 Cover 121, 122 ... Positioning stator

Claims (6)

[Claims] 1. A magnet whose outer peripheral surface is divided in a circumferential direction and is alternately magnetized to different poles and rotatable around a center of rotation, a coil arranged in an axial direction of the magnet, and excited by the coil. The outer magnetic pole portion facing the outer peripheral surface of the magnet and the inner magnetic pole portion facing the inner peripheral surface, and the center of the magnet is shifted from a straight line connecting the center of the outer magnetic pole and the rotation center of the magnet. A motor having holding means for holding the magnet at a position, light source means,
An optical prism that is disposed in front of the light source means and includes a surface that totally reflects part of the incident light beam and controls the emitted light; and an optical prism that is disposed in front of the optical prism and the relative distance to the optical prism can be changed. Optical panel and the rotation of the motor,
A lighting device, comprising: changing means for changing a relative distance between the optical panel and the optical prism. A motor, light source means, an optical prism arranged in front of the light source means for totally reflecting a part of the incident light beam to control the emitted light, and an optical prism arranged in front of the optical prism; An optical panel whose relative distance to the prism can be changed, a rotating member that rotates in conjunction with the rotation of the motor, and has a cylindrical portion that is eccentric with respect to the center of rotation, and an eccentric cylindrical portion of the rotating member. A lighting device, comprising: a driving member that fits and changes a relative distance between the optical panel and the optical prism by a rotational movement of the cylindrical portion. 3. A magnet whose outer peripheral surface is divided in a circumferential direction and is alternately magnetized to different poles and rotatable around a center of rotation, a coil arranged in an axial direction of the magnet, and excited by the coil. The outer magnetic pole portion facing the outer peripheral surface of the magnet and the inner magnetic pole portion facing the inner peripheral surface, and the center of the magnet is shifted from a straight line connecting the center of the outer magnetic pole and the rotation center of the magnet. A motor having holding means for holding the magnet at a position, light source means,
And two optical members arranged in the optical axis direction for reflecting and / or refracting and deflecting a light beam from the light source means, and displacing a relative positional relationship between the two optical members by the motor. An illuminating device, wherein an emission angle of a light beam from one of the two optical members is variable. 4. A magnet whose outer peripheral surface is divided in the circumferential direction and is alternately magnetized to different poles and rotatable around a center of rotation, a coil arranged in the axial direction of the magnet, and excited by the coil. The outer magnetic pole portion facing the outer peripheral surface of the magnet and the inner magnetic pole portion facing the inner peripheral surface, and the center of the magnet is shifted from a straight line connecting the center of the outer magnetic pole and the rotation center of the magnet. A motor having holding means for holding the magnet at a position, light source means,
An optical prism disposed in front of the light source means, and an optical panel disposed further in front of the optical prism,
A lighting device characterized in that a relative positional relationship between the optical prism and the optical panel is displaceable by the motor, and an emission angle of a light beam emitted from the optical panel is variable. 5. An imaging device comprising the lighting device according to claim 1. Description: 6. An imaging device having the illumination device according to claim 1, wherein the optical panel has at least a part of a light emitting portion exposed on an outer surface of the imaging device. An imaging device, wherein an irradiation angle of a light beam emitted from the lighting device is variable according to a situation where the device is placed.