JP4291033B2

JP4291033B2 - Lighting device

Info

Publication number: JP4291033B2
Application number: JP2003117494A
Authority: JP
Inventors: 茂堂埜; 亮彦斎藤; 孝夫後藤
Original assignee: Panasonic Corp; Matsushita Electric Works Ltd
Current assignee: Panasonic Corp; Panasonic Electric Works Co Ltd
Priority date: 2003-04-22
Filing date: 2003-04-22
Publication date: 2009-07-08
Anticipated expiration: 2023-04-22
Also published as: JP2004327134A

Description

【０００１】
【発明の属する技術分野】
本発明は、配光を変更可能な照明装置に関するものである。
【０００２】
【従来の技術】
従来から、光源と、少なくとも一部が他の部位に対して可動とした可動部であって光源の光を配光する配光部材と、配光部材の可動部を駆動する駆動体とを備え、配光部材の可動部を駆動体によって動作させることにより配光を変更可能な照明装置が提供されている。
【０００３】
従来は、ヒンジなどを介して配光部材の他の部位と結合することにより可動とされた可動部を、駆動体としてのモータによって駆動していた（例えば、特許文献１及び特許文献２参照）。
【０００４】
【特許文献１】
特開平８−１８３３８５号公報（第２−４頁、第２図）
【特許文献２】
登録実用新案第２５７６１２４号公報（第２−３頁、第６図）
【０００５】
【発明が解決しようとする課題】
しかし、モータを保持するための構成やモータの回転力を可動部に伝えるための構成が必要であったため、構成が複雑になって製造コストが高くなっていた。
【０００６】
本発明は上記事由に鑑みてなされたものであり、その目的は、構成が簡易で製造コストを低減することができる照明装置を提供することにある。
【０００７】
【課題を解決するための手段】
請求項１の発明は、光源と、少なくとも一部が他の部位に対して可動とした可動部であって光源の光を配光する配光部材と、配光部材の可動部を駆動する駆動体とを備えた照明装置であって、駆動体を、可撓性を有する絶縁材料からなるシート形状の誘電部及び誘電部の表裏両面にそれぞれ設けられた可撓性を有する導電材料からなる電極部とを有する電歪型アクチュエータによって構成し、一方の電極部の弾性力を、他方の電極部の弾性力よりも強くしたことを特徴とする。
【０００８】
請求項２の発明は、請求項１の発明において、配光部材は複数個の可動部を有することを特徴とする。
【００１０】
請求項３の発明は、請求項１の発明において、配光部材の可動部は可撓性を有する材料からなり、配光部材の可動部の一部は他の部位よりも薄肉に形成されていることを特徴とする。
【００１１】
請求項４の発明は、請求項１の発明において、配光部材の可動部と他の部位との間には切れ目が設けられていることを特徴とする。
【００１２】
請求項５の発明は、請求項１の発明において、配光部材の可動部は、可撓性を有しかつ光を反射する材料からなることを特徴とする。
【００１３】
請求項６の発明は、請求項５の発明において、電極部のうち少なくとも１個は駆動体の表面に露出し、駆動体の表面に露出した電極部の少なくとも１個は光を反射する材料からなり配光部材の可動部として兼用されることを特徴とする。
【００１４】
請求項７の発明は、請求項１の発明において、配光部材の可動部は、可撓性を有する材料からなる基体の表面に光反射膜を形成してなることを特徴とする。
【００１５】
請求項８の発明は、請求項７の発明において、光反射膜は導電性を有する材料からなり駆動体の電極部として兼用され、基体は絶縁性を有する材料からなるシート形状であって表面に光反射膜が形成されて駆動体の誘電部として兼用されることを特徴とする。
【００１６】
請求項９の発明は、請求項８の発明において、基体の一部の厚み寸法を他の部位よりも小さくし、基体の厚み寸法を小さくした部位の裏面に電極部を設けたことを特徴とする。
【００１８】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００１９】
（実施形態１）
本実施形態は、図１に示すように、表面が光を反射する配光部材１と、配光部材１の裏面に接着剤Ｂを用いて貼着された駆動体２とを備える。
【００２０】
駆動体２は、可撓性を有する絶縁材料からなるシート形状の誘電部２１及び誘電部２１の両面にそれぞれ設けられた可撓性を有する導電材料からなる電極部２２とを有する電歪型アクチュエータである。両電極部２２の間には、直流電源Ｅと電源スイッチＳＷ１との直列回路と、放電抵抗Ｒと放電スイッチＳＷ２との直列回路とが、互いに並列に接続されている。
【００２１】
一般に、電歪型アクチュエータは、図２に示すように可撓性を有する絶縁材料からなるシート形状の誘電部Ａ１と、誘電部Ａ１の両面にそれぞれ設けられた可撓性を有する導電材料からなる電極部Ａ２とを有するものである。図３に示すように、両電極部Ａ２の間に直流電圧を加えると、各電極部Ａ２にそれぞれ電荷が蓄積されて両電極部Ａ２の間に静電引力が生じ、誘電部Ａ１が矢印で示すように厚み方向に押しつぶされて面方向に広がることによって駆動力が生じる。
【００２２】
さらに、本実施形態においては、図４に示すように一方の電極部２２は他方の電極部２２よりも厚く形成されていて、厚く形成された一方の電極部２２の弾性力は他方の電極部２２の弾性力よりも強くなっている。そして、電源スイッチＳＷ１をオンにして両電極部２２の間に電圧を加えたときには、誘電部２１が厚み方向に押しつぶされて面方向に広がることによる駆動力と、両電極部２２の弾性力の差とによって、駆動体２は図５に示すように厚い電極部２２に凹面が形成されるように曲がる。その後、電源スイッチＳＷ１をオフにしてから放電スイッチＳＷ２をオンにして両電極部２２にそれぞれ蓄えられた電荷を放電抵抗Ｒを通して逃がすと、駆動体２は各部の弾性力によって図４に示す形状に戻る。
【００２３】
配光部材１は、可撓性を有し光を反射する例えば薄い金属板からなり、図６に示すように、全体として両端の開口の大きさが異なる筒状に形成され、表面が内側面となっている。光源（図示せず）は配光部材１の表面側に配置され、配光部材１の表面が光源の光を配光する。駆動体２は厚い側の電極部２２が配光部材１の裏面の扇形の範囲に貼着されている。配光部材１の駆動体２が貼着された範囲が可動部１ａとなっている。また、配光部材１の周方向において可動部１ａと他の部位との境界の一方には、切れ目１１が設けられている。また、配光部材１の可動部１ａには、周方向に延びた長細い範囲を他の部位よりも薄肉にする溝１２が設けられている。
【００２４】
駆動体２を動作させると、配光部材１の可動部１ａは駆動体２の動作に伴って図６の矢印で示すように駆動される。ここで、配光部材１の可動部１ａには溝１２が設けられて一部が薄肉になっていることにより、可動部１ａをスムーズに変形させることができる。ここで、駆動体２の両電極部２２の間に電圧を加えたとき、配光部材１の可動部は駆動体２によって周方向にも押し広げられるから、切れ目１１を設けていない場合は可動部１ａの周囲にひずみが生じる。一方本実施形態においては、可動部１ａが周方向に広がっても配光部材１に設けられた切れ目１１が狭まるだけであるから、可動部１ａの周囲のひずみが防止される。また、切れ目１１が設けられていることにより、配光部材１の可動部１ａ以外の部位から可動部１ａが受ける力が弱まるから、可動部１ａがスムーズに動作することができる。
【００２５】
上記構成によれば、駆動体２を配光部材１に貼着するだけでよく、駆動体２を保持するための構成や駆動体２の力を配光部材１の可動部１ａに伝えるための構成を別途設ける必要がないから、駆動体としてモータを用いる場合に比べて構成が簡易になり、製造コストを低減することができる。
【００２６】
なお、配光部材１の複数箇所を可動部とし、それぞれを駆動体２によって駆動してもよい。この構成を採用すれば、配光をより多彩に変化させることができる。
【００２９】
（実施形態２）
図７に示すように、本実施形態の配光部材３の形状は実施形態１の配光部材１の形状と略同じになっているが、配光部材３の可動部３１が駆動体としても兼用されている点が実施形態１と異なる。詳しく説明すると、配光部材３の可動部３１は、図８に示すように、例えば天然ゴムやシリコンやポリイミドのような可撓性と絶縁性とを有する材料からなりシート形状に形成された基体４を備える。配光部材３の表面側となる基体４の表面には金属の薄膜のような導電性と可撓性とを有する材料からなる光反射膜５が設けられ、基体４の裏面には導電性を有する材料からなる電極部６が設けられている。つまり、光反射膜５が一方の電極部として兼用され、基体４が誘電部として兼用されている。
【００３０】
ここで、光反射膜５の弾性力は電極部６の弾性力よりも強くしてあり、図９に示すように電圧を加えたときには配光部材３の可動部３１は光反射膜５に凹面が形成されるように曲がる。その後、光反射膜５と電極部６とにそれぞれ蓄えられた電荷を逃がすと、可動部３１は各部の弾性力によって図８に示す形状に戻る。以上により、可動部３１は図７に矢印で示すように駆動される。
【００３１】
上記構成によれば、配光部材３の可動部３１が駆動体としても兼用されていることにより、実施形態１に比べて構成がより簡易になり、製造コストの更なる低減が可能である。
【００３２】
なお、図１０に示すように、基体４の一部の厚み寸法を他の部位よりも小さくする凹部４１を基体４の裏面に設けるとともに、電極部６を設ける範囲を凹部４１内としてもよい。この構成によれば、基体４の光反射膜５と電極部６とに挟まれた部位の厚み寸法を小さくしたことにより駆動体としての動作に必要な電圧が低くなっている上に、基体４の他の部位の厚みを維持することにより配光部材３の全体の強度の低下が防止されている。
【００３３】
ここで、光源側に位置する光反射膜５は、電極部６に比べて光源の交換などの際に人が接触する可能性が高いため、電圧を加える際は光反射膜５を低電圧側の電極とし電極部６を高電圧側の電極とすることが事故防止の観点から望ましい。
【００３４】
【発明の効果】
請求項１の発明は、光源と、少なくとも一部が他の部位に対して可動とした可動部であって光源の光を配光する配光部材と、配光部材の可動部を駆動する駆動体とを備えた照明装置であって、駆動体を、可撓性を有する絶縁材料からなるシート形状の誘電部及び誘電部の表裏両面にそれぞれ設けられた可撓性を有する導電材料からなる電極部とを有する電歪型アクチュエータによって構成し、一方の電極部の弾性力を、他方の電極部の弾性力よりも強くしたので、駆動体としてモータを用いる場合に比べて構成が簡易になり、製造コストを低減することができる。
【００３５】
請求項２の発明は、請求項１の発明において、配光部材は複数個の可動部を有するので、配光をより多彩に変化させることができる。
【００３７】
請求項３の発明は、請求項１の発明において、配光部材の可動部は可撓性を有する材料からなり、配光部材の可動部の一部は他の部位よりも薄肉に形成されているから、可動部の薄肉に形成された部位が曲がりやすくなることにより、可動部をより柔軟に変形させることができる。
【００３８】
請求項４の発明は、請求項１の発明において、配光部材の可動部と他の部位との間には切れ目が設けられているので、切れ目を設けない場合に比べ、配光部材の可動部が他の部位から受ける力が弱くなるから、より柔軟に可動部を動作させることができる。
【００３９】
請求項５の発明は、請求項１の発明において、配光部材の可動部は、可撓性を有しかつ光を反射する材料からなるので、配光部材の可動部を柔軟に変形させることができる。
【００４０】
請求項６の発明は、請求項５の発明において、電極部のうち少なくとも１個は駆動体の表面に露出し、駆動体の表面に露出した電極部の少なくとも１個は光を反射する材料からなり配光部材の可動部として兼用されるので、配光部材の可動部を別途に設ける必要がないから、構成をより簡易にすることができる。
【００４１】
請求項７の発明は、請求項１の発明において、配光部材の可動部は、可撓性を有する材料からなる基体の表面に光反射膜を形成してなるので、配光部材の可動部を柔軟に変形させることができる。
【００４２】
請求項８の発明は、請求項７の発明において、光反射膜は導電性を有する材料からなり駆動体の電極部として兼用され、基体は絶縁性を有する材料からなるシート形状であって表面に光反射膜が形成されて駆動体の誘電部として兼用されるので、構成がより簡易になり、製造コストをさらに低減することができる。
【００４３】
請求項９の発明は、請求項８の発明において、基体の一部の厚み寸法を他の部位よりも小さくし、基体の厚み寸法を小さくした部位の裏面に電極部を設けたので、基体の電極部に挟まれた部位の厚み寸法を小さくすることにより駆動体としての動作に必要な電圧を低くすることができ、同時に基体の他の部位の厚みを厚くすることができるから配光部材の可動部の機械的強度を犠牲にすることがない。
【図面の簡単な説明】
【図１】本発明の実施形態１を示す説明図である。
【図２】一般的な電歪アクチュエータを示す斜視図である。
【図３】同上の動作を示す説明図である。
【図４】本発明の実施形態１の駆動体を示す説明図である。
【図５】同上の駆動体の動作を示す説明図である。
【図６】同上を示す斜視図である。
【図７】本発明の実施形態２を示す説明図である。
【図８】同上の配光部材の可動部の光反射膜と電極部との間に電圧を加えていない状態を示す説明図である。
【図９】同上の配光部材の可動部の光反射膜と電極部との間に電圧を加えた状態を示す説明図である。
【図１０】同上の別の形態の要部を示す説明図である。
【符号の説明】
１配光部材
１ａ可動部
２駆動体
３配光部材
４基体
５光反射膜
６電極部
１１切れ目
１２溝
２１誘電部
２２電極部
３１可動部
４１凹部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device capable of changing light distribution.
[0002]
[Prior art]
Conventionally, a light source, a movable part at least partially movable with respect to another part, a light distribution member that distributes light of the light source, and a driver that drives the movable part of the light distribution member are provided. There is provided an illumination device capable of changing light distribution by operating a movable portion of a light distribution member by a driver.
[0003]
Conventionally, a movable part that is movable by being coupled to another part of the light distribution member via a hinge or the like is driven by a motor as a driving body (see, for example, Patent Document 1 and Patent Document 2). .
[0004]
[Patent Document 1]
JP-A-8-183385 (page 2-4, FIG. 2)
[Patent Document 2]
Registered Utility Model No. 2576124 (page 2-3, FIG. 6)
[0005]
[Problems to be solved by the invention]
However, since a configuration for holding the motor and a configuration for transmitting the rotational force of the motor to the movable portion are necessary, the configuration is complicated and the manufacturing cost is high.
[0006]
This invention is made | formed in view of the said reason, The objective is to provide the illuminating device which can simplify a structure and can reduce manufacturing cost.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a light source, a movable part at least partially movable with respect to another part, a light distribution member for distributing light from the light source, and a drive for driving the movable part of the light distribution member And an electrode made of a flexible conductive material provided on each of both the front and back surfaces of the dielectric part and a sheet-like dielectric part made of a flexible insulating material. And an elastic force of one electrode part is made stronger than an elastic force of the other electrode part .
[0008]
The invention of claim 2 is characterized in that, in the invention of claim 1, the light distribution member has a plurality of movable parts.
[0010]
According to a third aspect of the present invention, in the first aspect of the invention, the movable portion of the light distribution member is made of a material having flexibility, and a part of the movable portion of the light distribution member is formed thinner than other portions. It is characterized by being.
[0011]
The invention of claim 4 is characterized in that, in the invention of claim 1, a cut is provided between the movable portion of the light distribution member and another portion.
[0012]
According to a fifth aspect of the invention, in the first aspect of the invention, the movable portion of the light distribution member is made of a material that has flexibility and reflects light.
[0013]
According to a sixth aspect of the invention, in the fifth aspect of the invention, at least one of the electrode portions is exposed on the surface of the driver, and at least one of the electrode portions exposed on the surface of the driver is made of a material that reflects light. It is also used as a movable part of the light distribution member.
[0014]
According to a seventh aspect of the invention, in the first aspect of the invention, the movable portion of the light distribution member is formed by forming a light reflecting film on the surface of a base made of a flexible material.
[0015]
The invention according to claim 8 is the invention according to claim 7 , wherein the light reflecting film is made of a conductive material and is also used as an electrode portion of the driving body, and the base is a sheet shape made of an insulating material and is formed on the surface. A light reflecting film is formed and used also as a dielectric part of the driver.
[0016]
The invention of claim 9 is characterized in that, in the invention of claim 8 , the thickness of a part of the base is made smaller than that of the other part, and the electrode part is provided on the back surface of the part where the thickness of the base is made small. To do.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
(Embodiment 1)
As shown in FIG. 1, the present embodiment includes a light distribution member 1 whose surface reflects light, and a driver 2 attached to the back surface of the light distribution member 1 using an adhesive B.
[0020]
The driving body 2 includes an electrostrictive actuator having a sheet-shaped dielectric portion 21 made of a flexible insulating material and electrode portions 22 made of a conductive material having flexibility provided on both surfaces of the dielectric portion 21. It is. Between the two electrode portions 22, a series circuit of a DC power source E and a power switch SW1 and a series circuit of a discharge resistor R and a discharge switch SW2 are connected in parallel to each other.
[0021]
In general, an electrostrictive actuator is made of a sheet-shaped dielectric portion A1 made of a flexible insulating material as shown in FIG. 2, and a flexible conductive material provided on both surfaces of the dielectric portion A1. It has electrode part A2. As shown in FIG. 3, when a DC voltage is applied between both electrode parts A2, charges are accumulated in each electrode part A2, electrostatic attraction is generated between both electrode parts A2, and dielectric part A1 is indicated by an arrow. As shown, driving force is generated by being crushed in the thickness direction and spreading in the surface direction.
[0022]
Furthermore, in this embodiment, as shown in FIG. 4, one electrode part 22 is formed thicker than the other electrode part 22, and the elastic force of one electrode part 22 formed thick is the other electrode part. It is stronger than the elastic force of 22. When the power switch SW1 is turned on and a voltage is applied between the electrode portions 22, the driving force due to the dielectric portion 21 being crushed in the thickness direction and spreading in the plane direction, and the elastic force of the electrode portions 22 Due to the difference, the driving body 2 bends so that a concave surface is formed on the thick electrode portion 22 as shown in FIG. After that, when the power switch SW1 is turned off and the discharge switch SW2 is turned on to release the charges stored in the two electrode portions 22 through the discharge resistance R, the driving body 2 has the shape shown in FIG. Return.
[0023]
The light distribution member 1 is made of, for example, a thin metal plate that is flexible and reflects light. As shown in FIG. 6, the light distribution member 1 is formed into a cylindrical shape having different opening sizes at both ends, and the surface is an inner surface. It has become. A light source (not shown) is disposed on the surface side of the light distribution member 1, and the surface of the light distribution member 1 distributes the light of the light source. In the driver 2, the thicker electrode portion 22 is attached to the fan-shaped area on the back surface of the light distribution member 1. The range where the drive body 2 of the light distribution member 1 is attached is the movable portion 1a. In addition, a cut line 11 is provided on one of the boundaries between the movable portion 1a and another part in the circumferential direction of the light distribution member 1. Moreover, the movable part 1a of the light distribution member 1 is provided with a groove 12 that makes a long and narrow range extending in the circumferential direction thinner than other parts.
[0024]
When the driving body 2 is operated, the movable portion 1a of the light distribution member 1 is driven as indicated by the arrow in FIG. Here, since the movable portion 1a of the light distribution member 1 is provided with the groove 12 and is partially thinned, the movable portion 1a can be smoothly deformed. Here, when a voltage is applied between the two electrode portions 22 of the driving body 2, the movable portion of the light distribution member 1 is also expanded in the circumferential direction by the driving body 2, so that it is movable when the cut 11 is not provided. Distortion occurs around the part 1a. On the other hand, in this embodiment, even if the movable part 1a spreads in the circumferential direction, the cut 11 provided in the light distribution member 1 only narrows, so that distortion around the movable part 1a is prevented. In addition, since the cut 11 is provided, the force received by the movable portion 1a from a portion other than the movable portion 1a of the light distribution member 1 is weakened, so that the movable portion 1a can operate smoothly.
[0025]
According to the above configuration, it is only necessary to attach the driving body 2 to the light distribution member 1. The configuration for holding the driving body 2 and the force of the driving body 2 are transmitted to the movable portion 1 a of the light distribution member 1. Since there is no need to provide a separate configuration, the configuration is simplified compared to the case where a motor is used as the driving body, and the manufacturing cost can be reduced.
[0026]
Note that a plurality of locations of the light distribution member 1 may be movable parts, and each may be driven by the driver 2. If this configuration is adopted, the light distribution can be changed more variously.
[0029]
(Embodiment 2)
As shown in FIG. 7 , the shape of the light distribution member 3 of the present embodiment is substantially the same as the shape of the light distribution member 1 of the first embodiment, but the movable portion 31 of the light distribution member 3 can be used as a driver. The point which is shared is different from the first embodiment. More specifically, as shown in FIG. 8 , the movable portion 31 of the light distribution member 3 is a base made of a material having flexibility and insulation, such as natural rubber, silicon, or polyimide, and formed into a sheet shape. 4 is provided. A light reflecting film 5 made of a material having conductivity and flexibility such as a metal thin film is provided on the surface of the base 4 which is the surface side of the light distribution member 3, and the back surface of the base 4 is made conductive. An electrode portion 6 made of a material having the same is provided. That is, the light reflection film 5 is also used as one electrode part, and the base 4 is also used as a dielectric part.
[0030]
Here, the elastic force of the light reflecting film 5 is stronger than the elastic force of the electrode portion 6, and the movable portion 31 of the light distribution member 3 is concave on the light reflecting film 5 when a voltage is applied as shown in FIG. 9 . Bend to form. Thereafter, when the charges stored in the light reflecting film 5 and the electrode part 6 are released, the movable part 31 returns to the shape shown in FIG. 8 by the elastic force of each part. Thus, the movable portion 31 is driven as indicated by an arrow in FIG.
[0031]
According to the above configuration, since the movable portion 31 of the light distribution member 3 is also used as a driving body, the configuration is simpler than that of the first embodiment, and the manufacturing cost can be further reduced.
[0032]
As shown in FIG. 10 , a recess 41 that makes the thickness of a part of the base 4 smaller than other parts may be provided on the back surface of the base 4, and a range in which the electrode portion 6 is provided may be within the recess 41. According to this configuration, the voltage required for the operation as the driving body is reduced by reducing the thickness dimension of the portion sandwiched between the light reflecting film 5 and the electrode portion 6 of the base 4, and the base 4 By maintaining the thickness of the other parts, a decrease in the overall strength of the light distribution member 3 is prevented.
[0033]
Here, the light reflecting film 5 positioned on the light source side is more likely to come into contact with a person when exchanging the light source than the electrode unit 6, so when applying a voltage, the light reflecting film 5 is placed on the low voltage side. It is desirable from the viewpoint of preventing accidents that the electrode portion 6 is an electrode on the high voltage side.
[0034]
【The invention's effect】
The invention according to claim 1 is a light source, a movable part at least partially movable with respect to another part, a light distribution member for distributing light from the light source, and a drive for driving the movable part of the light distribution member And an electrode made of a flexible conductive material provided on each of both the front and back surfaces of the dielectric part and a sheet-like dielectric part made of a flexible insulating material. Since the elastic force of one electrode part is made stronger than the elastic force of the other electrode part, the structure is simplified compared to the case where a motor is used as the driving body. The manufacturing cost can be reduced.
[0035]
In the invention of claim 2, in the invention of claim 1, since the light distribution member has a plurality of movable portions, the light distribution can be changed more variously.
[0037]
According to a third aspect of the present invention, in the first aspect of the invention, the movable portion of the light distribution member is made of a material having flexibility, and a part of the movable portion of the light distribution member is formed thinner than other portions. Therefore, the movable part can be deformed more flexibly because the thin part of the movable part is easily bent.
[0038]
In the invention of claim 4, in the invention of claim 1, since the cut is provided between the movable portion of the light distribution member and another part, the light distribution member is movable as compared with the case where no cut is provided. Since the force that the part receives from other parts becomes weak, the movable part can be operated more flexibly.
[0039]
According to a fifth aspect of the present invention, in the first aspect of the invention, since the movable portion of the light distribution member is made of a material having flexibility and reflecting light, the movable portion of the light distribution member is flexibly deformed. Can do.
[0040]
According to a sixth aspect of the invention, in the fifth aspect of the invention, at least one of the electrode portions is exposed on the surface of the driver, and at least one of the electrode portions exposed on the surface of the driver is made of a material that reflects light. Since it is also used as the movable part of the light distribution member, it is not necessary to separately provide the movable part of the light distribution member, so that the configuration can be further simplified.
[0041]
According to a seventh aspect of the present invention, in the first aspect of the invention, the movable portion of the light distribution member is formed by forming a light reflecting film on the surface of the substrate made of a flexible material. Can be flexibly deformed.
[0042]
The invention according to claim 8 is the invention according to claim 7 , wherein the light reflecting film is made of a conductive material and is also used as an electrode portion of the driving body, and the base is a sheet shape made of an insulating material and is formed on the surface. Since the light reflecting film is formed and also used as the dielectric portion of the driver, the configuration becomes simpler and the manufacturing cost can be further reduced.
[0043]
In the invention of claim 9, in the invention of claim 8 , since the thickness of a part of the base is made smaller than the other part and the electrode part is provided on the back surface of the part where the thickness of the base is made small, By reducing the thickness dimension of the part sandwiched between the electrode parts, the voltage required for the operation as the driving body can be reduced, and at the same time, the thickness of the other part of the base can be increased. The mechanical strength of the movable part is not sacrificed.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing Embodiment 1 of the present invention.
FIG. 2 is a perspective view showing a general electrostrictive actuator.
FIG. 3 is an explanatory diagram showing the operation described above.
FIG. 4 is an explanatory diagram showing a driving body according to the first embodiment of the present invention.
FIG. 5 is an explanatory diagram showing the operation of the driving body.
FIG. 6 is a perspective view showing the same.
FIG. 7 is an explanatory view showing Embodiment 2 of the present invention.
FIG. 8 is an explanatory diagram showing a state in which no voltage is applied between the light reflecting film of the movable part of the light distribution member and the electrode part .
FIG. 9 is an explanatory view showing a state in which a voltage is applied between the light reflecting film and the electrode part of the movable part of the light distribution member .
FIG. 10 is an explanatory view showing the main part of another embodiment of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light distribution member 1a Movable part 2 Drive body 3 Light distribution member 4 Base | substrate 5 Light reflection film 6 Electrode part 11 Cut 12 Groove 21 Dielectric part 22 Electrode part 31 Movable part 41 Recess

Claims

An illuminating device comprising: a light source; a movable part at least partially movable with respect to another part; a light distribution member that distributes light from the light source; and a driver that drives the movable part of the light distribution member An electrostrictive type having a driving body having a sheet-shaped dielectric portion made of a flexible insulating material and electrode portions made of a conductive material having flexibility provided on both front and back surfaces of the dielectric portion. An illuminating device comprising an actuator, wherein the elastic force of one electrode part is made stronger than the elastic force of the other electrode part .

The lighting device according to claim 1, wherein the light distribution member has a plurality of movable parts.

The lighting device according to claim 1 , wherein the movable part of the light distribution member is made of a flexible material, and a part of the movable part of the light distribution member is formed thinner than other parts .

The lighting device according to claim 1, wherein a cut is provided between the movable portion of the light distribution member and another portion .

The lighting device according to claim 1 , wherein the movable portion of the light distribution member is made of a material that is flexible and reflects light .

At least one of the electrode portions is exposed on the surface of the driving body, and at least one of the electrode portions exposed on the surface of the driving body is made of a material that reflects light and is also used as a movable portion of the light distribution member. The lighting device according to claim 5 .

The movable portion of the light distribution member, the lighting apparatus according to claim 1, characterized in that by forming a light reflection film on a surface of a substrate made of a flexible material.

The light reflecting film is made of a conductive material and is also used as the electrode part of the driving body, and the base is a sheet made of an insulating material, and the surface is formed with a light reflecting film and is also used as the dielectric part of the driving body. lighting apparatus according to claim 7, characterized in that it is.

9. The lighting device according to claim 8 , wherein a thickness dimension of a part of the base is made smaller than other parts, and an electrode part is provided on a back surface of the part where the thickness dimension of the base is made small .