JP2003216070A - Optical device and optical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture an optical device having durability excellent in bending strength. <P>SOLUTION: An optical device 100 in which fiber shaped optical elements 10 each of which has a core part 12 and a gap part 13 guiding light in a pipe shaped clad part 11 and in which a medium 14 having a flow property is sealed in the clad part 11 so as to be movable are arranged in a textile shape is provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an optical device and an optical element.

[0002]

2. Description of the Related Art In recent years, display devices have been
Demand for machine interfaces is increasing more and more, and for example, display devices such as PDP (plasma display), FED (field emission display), ELD (electroluminescence display), LCD (liquid crystal display) have already been put into practical use. There is. The precision of these displays has advanced with the development of electronics, and both quality and price have already reached the maturity stage.

A conventional display that makes full use of electronics uses an electric field and a current for a display screen and applies an electric field and a current to a pixel on a plane, and therefore requires an electrode for X-axis and Y-axis addressing. Requires two-dimensional wiring. For this reason, there is a drawback in that the electric resistance due to the electrodes or the wirings thereof inevitably increases when the display panel is upsized.

In addition, for example, a display using electronics such as a large television for home use has a large volume and power consumption, and a response speed is insufficient when following a high definition signal. There is room for improvement.

On the other hand, various proposals have been made for a display utilizing photonics in view of the problems of the electronic type display, and for example, an optical waveguide type display utilizing photonics is disclosed in Japanese Patent Laid-Open No. 2001-175197. Has been done.

The optical device utilizing photonics disclosed in the above publication does not use an electric field or current on the display screen, apart from a semiconductor laser used as a light source, and can display an image only by photoexcitation. Therefore, high-contrast and high-quality display is possible. Also, unlike the conventional electronic display, it does not require electrode wiring, which was the biggest factor preventing the screen size from becoming large.Therefore, the screen size of this optical waveguide type display has few structural restrictions and is large. Screening is possible.

[0007]

Here, the above-mentioned Japanese Patent Laid-Open No. 20
The optical device described in JP-A-01-175197 includes a plurality of first optical waveguides (or optical fibers) and a plurality of second optical waveguides (or optical fibers) orthogonal or substantially orthogonal to the first optical waveguides. ) And an optical switch excited by the light intensity of the laser light guided in each optical waveguide is provided at the intersection of these optical waveguides, and the optical switch is reflected outside or inside the optical switch as an optical path changing means. It has a configuration in which a plate is provided. That is, in order to emit light from a specific pixel, it is essential to intersect optical waveguides (optical fibers) corresponding to horizontal scanning lines and vertical scanning lines with each other.

As described above, in the conventional display device, in order to display one line, electrical or optical wiring to a position corresponding to each pixel in one line is required. This complicates the device manufacturing process, and in particular, in order to enlarge the display area, it is necessary to form optical waveguides that intersect with each other over a wide range.
It was an obstacle to thinning the display and making it flexible.

Therefore, as a result of intensive studies conducted by the present inventors in view of the above problems, addressing to an arbitrary point in one line is provided with electric wiring to each pixel or a combination of a plurality of optical waveguides. To provide a flexible flat surface (or solid) without fixing such an optical element on a substrate or welding between the elements. The optical device is provided.

Further, in the past, when a flat panel display was constructed with a fiber-type waveguide optical element, light from the fiber was emitted in all directions, and it was difficult to fully utilize the introduced light. . In particular, when laser light is applied as incident light, there is a problem that the field of view becomes narrow because the light does not diffuse sufficiently. Furthermore, when a flat panel display is configured with a fiber-type waveguide optical element, there is a problem that external light is reflected and a sufficient contrast cannot be obtained.

Therefore, in the present invention, the emitted light introduced for displaying an image is efficiently emitted to widen the viewing angle,
(EN) Provided are an optical element and an optical device which have improved contrast and improved visibility.

[0012]

The optical device of the present invention has a tubular clad part having a core part for guiding light and a void part, and a fluid medium can move in the clad part. It is assumed that the thus-enclosed fiber-shaped optical element is arranged in at least one of the vertical line and the horizontal line of the fabric-like array.

The optical element of the present invention has a core portion for guiding light and a void portion in a tubular clad portion, and a fluid medium is enclosed in the clad portion so as to be movable in the clad portion. It is assumed that the fiber-shaped optical element has a structure in which one end surface of the clad portion is provided with a function of reflecting light and a function of scattering light.

According to the optical device of the present invention, without fixing the optical element on the substrate or welding between the elements,
A flexible flat (or three-dimensional) display can be formed, which has high durability against bending and a high degree of freedom in shape.

According to the optical element of the present invention, the light introduced for displaying an image is efficiently emitted and scattered in the viewing direction to widen the viewing angle and absorb unnecessary light from the outside. In addition, the contrast can be increased and the visibility can be improved.

Further, in the optical element and the optical device of the present invention, the tubular clad portion is formed by using a material having flexibility, so that it is made flexible, and these are arranged in a woven arrangement. As a result, it is possible to apply the present invention to an optical display which has excellent flexibility and can cope with shape changes such as bending.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the optical device and optical element of the present invention are not limited to the following examples.

FIG. 1 is a schematic configuration diagram of an essential part of an example of an optical device according to the present invention. The optical device 100 of the present invention is
A fiber-shaped optical element 10 having a core part for guiding light in a tubular clad part and a void part, in which a fluid medium is enclosed so as to be movable in the clad part, It is assumed that it has a woven structure constituted by being arranged in at least one of the line or the horizontal line and combined with the fibers 101 arranged in a line.

The structure of the optical element 10 constituting the optical device 100 will be described below. 2 (A) and 2 (B),
The schematic diagram of the principal part of an optical element of an example is shown. Here, FIG.
FIG. 2A is a schematic sectional view in a direction perpendicular to the waveguide of the optical element, and FIG. 2B is a schematic sectional view in a direction parallel to the waveguide. The optical element 10 includes a tubular clad portion 11 and a core portion 12 that guides light inside the clad portion 11. It is assumed that the clad portion 11 has a hollow space 13 inside which a fluid medium 14 is enclosed, and the medium 14 forms a core portion 12 that guides light. The medium 14 can take a stationary state and a moving state in the void portion 13.

As shown in FIG. 3, the void portion 13 of the optical element 10 is communicated with a medium moving means 32 for moving the medium 14 in the void portion 13, and at least one end surface side of the cladding portion 11 has A light introducing means 33 having a light source for introducing light is arranged inside.

As the medium moving means 32, for example, an air pump can be applied, and in this case, the void portion 13
The position of the medium 14 can be controlled by adjusting the internal pressure by introducing desired air into or removing air from the inside.

Further, the light L emitted from the light source of the light introducing means 33 is introduced into the core portion 12 of the optical element 10 and propagates. The light introducing unit 33 may be provided at both ends of the optical element 10 so as to be incident from both sides, or may be incident only from one end side. The light propagating through the core portion 12 is emitted to the outside at the interface of the medium 14 of the optical element 10.

Further, the clad portion 11 may have a structure in which two or more kinds of media 14 are enclosed. When an interface is formed between the media, the light traveling through the optical waveguide is diffusely reflected at the interface between the media. Also at this interface, light is emitted from the waveguide to the outside of the optical element.

The clad portion 11 and the core portion 12 constituting the optical element 10 are selected in size according to the size of the target pixel, and are made of a material which is not corroded by the medium 14. The optical element 10 and the fiber 101 that compose the optical device 100 of the present invention are preferably formed using a flexible material such as plastic. This makes it easy to form a fabric-like arrangement as shown in FIG. 1 and realizes a flexible display with a simple structure. As a result, the degree of freedom of the shape can be increased, and for example, it can be applied to a display that can be wound up when not in use, and a display for clothing, a hat, tableware (for example, a cup).

As the medium 14, a medium having fluidity so as to be movable in the space 13 and transparent to the incident light L is applied. Further, when a plurality of mediums 14 are enclosed in the void portion 13, adjacent media are selected so that their compatibility is low enough to form an interface at their boundaries. For example, a liquid such as water, an organic solvent such as alcohol or toluene, a liquid such as a fluorine-based solvent and a gas such as air, or liquids having low compatibility can be appropriately combined and used.

When the refractive index of the cladding portion 11 is n ₁ and the refractive index of the core portion 12 is n ₂ , it is desirable that the relationship n ₁ <n ₂ is established. Thereby, the incident light L can be effectively confined in the core portion 12, and the loss at the time of light transmission can be reduced.

The medium moving means 32 is not limited to the air pump, and any other conventionally known means can be used as long as it has a function of moving the medium 14 by pressurizing or depressurizing the space 13. can do. For example, by using a piezo element, the position of the medium 14 and the position of the interface between different media can be controlled at high speed and finely.

The means for moving the position of the medium 14 is not limited to controlling the pressure, and other conventionally known methods can be applied.

Further, in the optical element 10 of the present invention,
The configuration is not limited to the configuration in which the laser light source 23 is arranged outside the clad portion 11. For example, an optical fiber for light incidence is applied as the laser light source 23, and this is used as the optical element 1.
It may be configured to be inserted into the core portion from at least one end of 0.

As the fiber 101 constituting the optical device 100 shown in FIG. 1, any conventionally known material can be appropriately used as long as it is a flexible material. For example, polymer materials such as polymethylmethacrylate (PMMA) and nylon, and metal materials such as steel wires can be used. If the fiber 101 is a flexible material,
It may have a structure in which a plurality of fibers are twisted together, and may be made of, for example, silk thread or cotton thread. Further, the fiber 101 may be colored in order to improve the visibility of the light emitted from the optical element 10. Particularly in the case of forming a display, it is desirable that the fiber 101 be black in order to improve the contrast.

In the optical device 100 of the present invention, as shown in FIG. 4, both vertical lines and horizontal lines are
The optical element 10 may be used.

The optical element 10 constituting the optical device 100 of the present invention is not limited to the example shown in FIG.
Various configurations shown below can be adopted. Optical element 1
FIGS. 5A and 5B are schematic views of the main part of another example of No. 0. In this example, the core portion 12 is formed so as to be in contact with the entire inner wall of the tubular clad portion 11, and the void portion 13 is formed so as to penetrate the core portion 12, and in the void portion 13,
The medium 14 having the fluidity is enclosed.

In the optical element 10 having the configuration shown in FIG. 5, by controlling the position of the medium 14 and blinking the incident light, the light propagating through the core portion 12 flows into the medium 14 and the core portion 12 The condition of total internal reflection of light is broken and light is emitted to the outside of the cladding 11.

When the refractive index of the clad portion 11 is n ₁ and the refractive index of the core portion 12 is n ₂ , it is desirable that the relationship n ₁ <n ₂ is established. Thereby, the incident light L can be effectively confined in the core portion 12, and the loss at the time of light transmission can be reduced. Also, medium 1
When the refractive index of 4 is n ₃ , it is desirable that the relationship of n ₃ ≧ n ₂ is established. Thereby, the core portion 12 can be efficiently used.
The light can be extracted from.

Further, the optical element 10 is shown in FIG.
As shown in (B), the core portion 12 is arranged so as to be in contact with the inner wall of the cladding portion 11, and the void portion 13 is adjacent to the core portion 12 and is in contact with the inner wall of the cladding portion 11. You can also

Further, as shown in FIGS. 7A and 7B,
The core portion 12 is arranged in the clad portion 11 via the void portion 13, and the void portion 13 is formed between the peripheral surface of the core portion 12 and the inner wall surface of the cladding portion 11. Alternatively, the medium 14 may be enclosed.

Next, the optical element according to the present invention will be described. 8A and 8B are schematic views showing an example of the optical element of the present invention. 8A is a schematic cross-sectional view of the optical element in a direction perpendicular to the waveguide, and FIG. 8B is a schematic cross-sectional view in a direction parallel to the waveguide.

Optical element 20 shown in FIGS. 8A and 8B.
Is the outer peripheral surface of the clad portion 11 constituting the optical element 10 shown in FIG. 2 and FIGS. 5 to 7, and is the view direction when the optical device 100 as shown in FIG. 8
A reflection film 21 that reflects light in the visible range is formed on the surface opposite to the surface (in the direction indicated by the arrow in the figure), that is, on the outer peripheral surface of the clad via the optical waveguide. The reflective film 21 can be formed using a conventionally known material as long as it reflects light in the visible range. For example, a metal such as aluminum may be formed into a film by a vapor deposition method, or a colloidal solution of metal fine particles may be applied and dried. By forming the reflective film 21, the guided light can be effectively confined in the waveguide, and the light can be effectively used.

The optical element 20 shown in FIGS. 8A and 8B is the outer peripheral surface of the clad portion 11 which constitutes the optical element 10 shown in FIGS. In the case where the optical device 100 shown in FIG. 1 is configured, the light scattering means 22 that scatters the emitted light is formed on the surface side in the viewing direction (direction shown by the arrow in FIG. 8). The light-scattering means 22 is formed of a material having a function of scattering emitted light. White fine particles, for example, fine particles of titanium oxide are dispersed in a predetermined binder such as a polymer, and a coating material is applied and dried. It can be formed by adhering to the outer peripheral surface of the clad portion 11. By forming the light scattering means 22, the introduced light can be efficiently scattered in the display direction.

Further, the optical element 20 shown in FIGS. 8A and 8B has a selected wavelength on the outer peripheral surface of the clad portion 11 constituting the optical element 10 shown in FIGS. 2 and 5 to 7. The light absorbing means 23 that absorbs only the above light is formed. The light absorbing means 23 has a function of absorbing light other than light used for image display, and a dye such as a polymer other than light used for display is combined and dispersed in a binder such as a predetermined polymer. It can be formed by applying the above coating material, drying it, and adhering it to the outer peripheral surface of the clad portion 11. As the disperse dye, when the optical element 20 is used as a full-color display, the wavelengths of the three primary colors of light, that is, 450 nm, 545 nm, 61
It is desirable to use a combination of dyes that do not absorb 0 nm light. By forming the light absorbing means 23,
It is possible to prevent deterioration of visibility due to irregular reflection of light such as illumination from the outside.

[Examples] The optical devices and optical elements of the present invention will be described below with reference to specific examples.
The present invention is not limited to the following examples, and can be arbitrarily modified within the scope of the invention.

[Embodiment 1] FIG. 9 shows a schematic view of an example of the optical device of the present invention. The optical device 100 has a structure in which the optical element 10 having the structure shown in FIG. 2 and a flexible fiber 101 are combined in a woven array. The optical element 10 in this example has a transparent tube (inner diameter 0.8 mm, outer diameter 2.4 mm, NO
RTON's Daigon tube) was used. Toluene was enclosed as the medium 14 forming the core portion, and a light introducing means having a helium neon laser and a medium moving means by an actuator were installed outside. As the flexible fiber 101, a nylon fiber (outer diameter 1 m
m) was used. Laser light emitted from a laser light source from one end of the transparent tube through a predetermined optical fiber and condensed by a lens is introduced into the tube material portion of the transparent tube.

In the optical device as described above, the internal pressure of the transparent tube is controlled to move toluene to a desired position, and the helium neon laser switch is turned on / off in accordance with the position of toluene. Light was emitted from the individual optical elements 10 at the interface between toluene and air. Such an operation of folding and unfolding the optical device 100 in the vertical direction or the horizontal direction is performed.
After repeating 00 times, the optical device was inspected for damage. As a result, the arrangement of the optical elements 10 was not disturbed, and no damage was confirmed in the individual optical elements 10. With the configuration as described above, an optical display having excellent flexibility and durability could be obtained.

[Comparative Example 1] An optical element having the same structure as the optical element 10 applied to the optical device of [Example 1] is used, and a plurality of optical elements 10 are fused by heat to form a planar shape. An optical device was produced. The light introducing means and the medium moving means used were the same as those in [Example 1]. After repeating the operation of folding and unfolding such an optical device in the vertical direction or the horizontal direction 1000 times and then performing a damage inspection of the optical device, peeling occurred in the fused portion of the optical element 10, and It was confirmed that the 10 arrays had irregularities. That is, it was revealed that the flexibility and durability were inferior to the optical device of the above [Example 1].

Next, the optical element of the present invention will be described with reference to specific examples. Example 2 In this example, the optical element 20 shown in FIG. 8 was applied. As the waveguide type optical element 10 having a movable medium therein, the optical element having the configuration shown in FIG. 2 is applied. The optical element 10 is
A transparent tube (inner diameter 0.8 mm, outer diameter 2.4 mm, NORTON Daigon tube) was used as the clad portion. Toluene is enclosed as the medium 14 forming the core part, and light from a halogen lamp arranged outside is passed through a glass filter to 450 nm, 545 nm, 610 nm.
The light was collected by the lens and introduced into the core part, and the medium moving means by the actuator was installed. The reflective film 21 was formed by attaching aluminum to the peripheral surface of the transparent tube by sputtering. The light scattering means 22 is 1 g of α-alumina powder (manufactured by Wako Pure Chemical Industries) having an average particle size of 0.5 μm.
Was mixed with a solution of 2 g of polymethylmethacrylate and chloroform to prepare a coating solution, which was applied to the visible side surface of the clad portion shown in FIG. 8 and dried. The light absorbing means 23 is not formed alone, but the laser dye C102 (absorption wavelength 400 n
m), and Rhodamin 110 (absorption wavelength 500
nm) (both manufactured by Exiton Co.).
1 g each was added to provide a function as a light absorbing means.
Laser light emitted from a laser light source from one end of the transparent tube through a predetermined optical fiber and condensed by a lens is introduced into the tube material portion of the transparent tube.

In the above-mentioned optical element, laser light of 450 nm, 545 nm and 610 nm was made incident respectively from the light source, and as a result, light of each color was emitted from the optical element. In addition, by applying the optical element in the present embodiment, FIG.
When the optical device 100 having the structure as shown in FIG. 6 was produced and an image was displayed in a room illuminated by a fluorescent lamp, reflection of light on the surface of the display screen was suppressed, and the contrast could be improved. . Further, since the light scattering means 22 is provided, the light emitted from the optical element 10 is scattered from the display screen, and it is possible to confirm whether the light is on or off in the direction of 180 degrees of the element and to widen the viewing angle. It was

[Comparative Example 2] Reflective film 21 and light scattering means 2
2, and the light absorbing means 23 is not provided, and other configurations are
An optical element was produced in the same manner as in [Example 2] above. In such an optical element, the
Laser lights of 5 nm and 610 nm were respectively incident. As a result, the amount of light emitted from the optical element was significantly smaller than that of the optical element of Example 2 above. Further, light emission could not be confirmed in a direction deviated from the light emitting point of the optical element by about 60 degrees with respect to the viewer direction. Further, when the optical device in the comparative example is applied to manufacture the optical device 100 having the configuration as shown in FIG. 9 and the image is displayed in the room illuminated by the fluorescent lamp, the fluorescent lamp image is displayed. The result was reflected on the surface and the visibility was extremely poor.

[0048]

As described above, according to the optical device of the present invention, there is no need for electrical wiring, and there is no need for a structure for crossing optical waveguides for displaying one pixel.
It can be applied to various optical devices such as optical switches and image display devices with a simple structure.

According to the optical element and the optical device of the present invention, the medium enclosed in the core portion inside the tubular clad portion, that is, the void portion provided adjacent to the optical waveguide,
Alternatively, the light could be emitted to the outside of the cladding with high efficiency at the interface between the media. Moreover, the position where light is emitted can be controlled by moving the medium in the void, and the invention can be applied to various optical devices having a simple structure.

Further, the optical device of the present invention can be made to have excellent flexibility, and particularly excellent durability against bending fracture.

Further, according to the optical element of the present invention, it is possible to efficiently emit the light introduced for displaying an image. In addition, the viewing angle can be widened by providing the light scattering means. Further, by providing the light absorbing means, it is possible to absorb unnecessary light from the outside,
The contrast was increased and the visibility was improved.

Further, in the optical element and the optical device of the present invention, by forming the tubular clad portion using a material having flexibility, it is possible to make it flexible and to form these into a woven array. This has made it possible to apply it to optical displays that have excellent flexibility and can respond to shape changes such as bending.

[Brief description of drawings]

FIG. 1 shows a schematic configuration diagram of an example of an optical device of the present invention.

FIG. 2A is a schematic cross-sectional view in a direction perpendicular to an optical waveguide of a main part of an optical element constituting an optical device of the present invention. B shows a schematic cross-sectional view in the optical waveguide direction of the main part of the optical element that constitutes the optical device of the present invention.

FIG. 3 shows a schematic configuration diagram of an optical element constituting the optical device of the present invention.

FIG. 4 is a schematic configuration diagram of another example of the optical device of the present invention.

FIG. 5 is a schematic sectional view in a direction perpendicular to an optical waveguide in another example of the optical element A. B shows a schematic sectional view in the optical waveguide direction in another example of the optical element.

FIG. 6 is a schematic cross-sectional view in a direction perpendicular to an optical waveguide in another example of the optical element A. B shows a schematic sectional view in the optical waveguide direction in another example of the optical element.

FIG. 7 is a schematic sectional view in a direction perpendicular to an optical waveguide in another example of the optical element A. B shows a schematic sectional view in the optical waveguide direction in another example of the optical element.

8A is a schematic sectional view of the optical element of the present invention in a direction perpendicular to an optical waveguide. FIG. B shows a schematic cross-sectional view of the optical element of the present invention in the optical waveguide direction.

FIG. 9 is a schematic configuration diagram of an example of an optical device using the optical element of the present invention.

[Explanation of symbols]

10 ... Optical element, 11 ... Clad part, 12 ... Core part, 13 ... Void part, 14 ... Medium, 21 ... Reflective film,
22 ... Light scattering means, 23 ... Light absorbing means, 32 ... Medium moving means, 33 ... Light introducing means, 100 ... Optical device, 101 ... Fiber.

Continued front page    (72) Inventor Kenichi Kurihara             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Ken Kobayashi             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Hiroshi Iwamoto             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Toshinori Tsuboi             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 2H038 AA43 AA44 BA42                 2H050 AB43 AC63                 5C094 AA06 AA08 AA15 AA31 AA48                       AA56 BA65 BA96 CA19 CA23                       DA06 ED02 ED11 ED13 FA01                       FA02

Claims (12)

[Claims] 1. A tubular clad part has a core part for guiding light and a hollow space, and a fluid medium is enclosed in the clad part so as to be movable in the clad part. An optical device, wherein the fiber-shaped optical element thus obtained is arranged on at least one of a vertical line and a horizontal line of the woven fabric array. 2. A clad part has a core part for guiding light and a void part formed in contact with the core part, wherein the fluid medium is a void part. 2. The container is enclosed so as to be movable.
The optical device according to. 3. The core portion of the optical element is provided in the clad so as to contact the entire inner wall surface, and the void portion is formed through the core portion. 3. A porous medium is enclosed so as to be movable in the void portion.
The optical device according to. 4. The core part of the optical element is arranged in contact with a part of an inner wall in the clad part, and the void part is provided adjacent to the core part and in contact with an inner wall of the clad. The optical device according to claim 1 or 2, wherein the fluid medium is enclosed in the void portion so as to be movable in the void portion. 5. The core portion is provided in the clad portion,
A void portion is formed over the entire surface between the outer peripheral surface of the core portion and the inner wall surface of the clad portion, and the fluid medium is allowed to move in the void portion. The optical device according to claim 1, wherein the optical device is encapsulated. 6. The clad portion is filled with at least two or more media, an interface is formed at a boundary between adjacent media, and light is extracted from the interface to the outside of the clad portion. Claims 1 to 1 characterized in that
6. The optical device according to any one of 5. 7. The optical device according to claim 1, wherein the clad portion and the core portion of the optical element are formed of a flexible material. 8. One of a vertical line and a horizontal line forming the optical device forming the woven array has a core portion for guiding light in a tubular clad portion and a void portion. The optical device according to any one of claims 1 to 7, wherein a fluid medium is enclosed in the clad portion so as to be movable in the clad portion. . 9. Each of a vertical line and a horizontal line forming the optical device forming the woven array has a core portion for guiding light in a tubular clad portion and a void portion. The optical device according to any one of claims 1 to 7, wherein a fluid medium is enclosed in the clad portion so as to be movable in the clad portion, and the fiber element is a fiber-like optical element. 10. A fiber having a core part for guiding light and a void part in a tubular clad part, wherein a fluid medium is enclosed in the clad part so as to be movable in the clad part. A circular optical element, which is the outer peripheral surface of the clad portion, on the surface opposite to the viewing direction surface side,
An optical element comprising a reflection film that reflects guided light. 11. A fiber having a core part for guiding light and a void part in a tubular clad part, wherein a fluid medium is enclosed in the clad part so as to be movable in the clad part. An optical element in the form of a circular shape, wherein a light scattering means for scattering light is arranged on the outer peripheral surface of the clad portion on the side of the viewing direction surface. 12. A fiber comprising a tubular clad part, a core part for guiding light, and a void part, wherein a fluid medium is enclosed in the clad part so as to be movable in the clad part. An optical element in the form of a ring, wherein a light absorbing means for absorbing only light of a selected wavelength is formed on the outer peripheral surface of the clad.