JP6428276B2

JP6428276B2 - Light distribution device and flash device provided with the same

Info

Publication number: JP6428276B2
Application number: JP2015003435A
Authority: JP
Inventors: 金井　守康; 守康金井
Original assignee: Ricoh Imaging Co Ltd
Current assignee: Ricoh Imaging Co Ltd
Priority date: 2015-01-09
Filing date: 2015-01-09
Publication date: 2018-11-28
Anticipated expiration: 2035-01-09
Also published as: CN105785691A; JP2016128883A; CN105785691B

Description

本発明は、配光装置及びこれを備えたフラッシュ装置に関する。 The present invention relates to a light distribution device and a flash device including the same.

写真撮影の人工光源（フラッシュ装置）では、棒状の発光管（発光部）からの光束を所定の被写体範囲（所定の撮影レンズの画角範囲）内に自然に（ムラ無く）配光するため、発光管の被写体側に拡散板やフレネルレンズが配置されている。さらに、この拡散板やフレネルレンズに重ねるようにして、配光範囲を拡散するためのアタッチメントを設けることが知られている。 In an artificial light source for photography (flash device), the luminous flux from a rod-shaped arc tube (light emitting part) is distributed naturally (with no unevenness) within a predetermined subject range (a range of angle of view of a predetermined photographing lens). A diffusion plate and a Fresnel lens are disposed on the subject side of the arc tube. Furthermore, it is known that an attachment for diffusing the light distribution range is provided so as to overlap the diffusion plate or the Fresnel lens.

特許文献１には、フラッシュ装置（ストロボ装置）の発光部からの出射光を広角に拡散するための光拡散アダプタが開示されている。この光拡散アダプタは、前面部（光学作用面）の長手方向の両端部にフラッシュ装置への取付用の折曲部が形成された断面コ字形状をなしており、前面部の内面（光入射面）のうち折曲部を除いた領域と前面部の外面（光出射面）のうち折曲部に対応する領域にそれぞれ多数の四角錐状の突起を形成したものである（四角錐状の突起を前面部の内外に配置分けしたものである）。 Patent Document 1 discloses a light diffusion adapter for diffusing emitted light from a light emitting unit of a flash device (strobe device) to a wide angle. This light diffusing adapter has a U-shaped cross section in which bent portions for attachment to the flash unit are formed at both ends in the longitudinal direction of the front surface portion (optical action surface). A plurality of quadrangular pyramidal protrusions are formed in the region corresponding to the bent portion of the outer surface (light emitting surface) of the front surface portion and the outer surface of the front surface portion (light emitting surface). The projections are arranged on the inside and outside of the front part).

特許文献２には、フラッシュ装置（ストロボ装置）に内蔵された光学部材のうち、発光管（発光部）に近い側の面に拡散作用部を設け、発光管（発光部）から遠い側の面に集光レンズ部（フレネルレンズ）を設けることが開示されている。 In Patent Document 2, a diffusion action portion is provided on a surface near the arc tube (light emission portion) among optical members built in the flash device (strobe device), and a surface far from the arc tube (light emission portion). It is disclosed to provide a condensing lens part (Fresnel lens).

特開２００２−１６９２０２号公報JP 2002-169202 A 特開平６−１７５２０３号公報JP-A-6-175203

しかしながら、本発明者の鋭意研究によると、特許文献１と特許文献２は、次のような技術課題を有している。 However, according to the present inventors' earnest research, Patent Literature 1 and Patent Literature 2 have the following technical problems.

特許文献１にあっては、フラッシュ装置の発光部からの全光束が一律な拡散作用を受けるので、光量ロス（全反射や散乱によって目的の方向に射出しない光、所望の配光範囲外に達する光エネルギー）が多過ぎて、所望の配光範囲への光量が不足するという問題がある。 In Patent Document 1, since the total luminous flux from the light emitting unit of the flash device is subjected to a uniform diffusion action, light amount loss (light that does not exit in the target direction due to total reflection or scattering, reaches outside the desired light distribution range). There is a problem that the amount of light in the desired light distribution range is insufficient due to too much light energy.

特許文献２にあっては、拡散作用部よりも射出側に集光レンズ部が配置されているので、拡散作用部で一旦拡散された光が集光レンズ部で再び集光されてしまい、拡散作用部により光の照射範囲を広げる効果が弱められ、広い照射範囲を確保することができないという問題がある。また特許文献２は、発光管の左右方向（軸方向）に対して拡散作用部の配置が短すぎるので、左右方向（軸方向）への拡散作用が足りないという問題がある。 In Patent Document 2, since the condensing lens unit is arranged on the exit side of the diffusion unit, the light once diffused by the diffusion unit is condensed again by the condensing lens unit and diffused. There is a problem that the effect of expanding the irradiation range of light is weakened by the action part, and a wide irradiation range cannot be secured. Further, Patent Document 2 has a problem that the diffusion action in the left-right direction (axial direction) is insufficient because the arrangement of the diffusion action part is too short with respect to the left-right direction (axial direction) of the arc tube.

本発明は、以上の問題意識に基づいてなされたものであり、所望の配光範囲に自然に配光することができる配光装置及びこれを備えたフラッシュ装置を得ることを目的とする。 The present invention has been made on the basis of the above problem awareness, and an object thereof is to obtain a light distribution device capable of naturally distributing light within a desired light distribution range and a flash device including the same.

本発明の配光装置は、所定の軸方向に沿って配置された発光部からの光を所定の範囲に配光するための光学作用板を備えた配光装置であって、前記光学作用板は、前記発光部からの光の配光を変更するための配光変更構造を有していること；前記光学作用板の配光変更構造は、前記所定の軸方向に沿って前記発光部の有効発光長よりも外側の部分に設けられていること；及び前記光学作用板の配光変更構造は、前記所定の軸方向に垂直な方向に対し、前記光学作用板の有効光学範囲の内側の一部分の範囲にのみ配置されていること；を特徴としている。 The light distribution device of the present invention is a light distribution device including an optical action plate for distributing light from a light emitting unit arranged along a predetermined axial direction to a predetermined range, and the optical action plate Has a light distribution changing structure for changing the light distribution of the light from the light emitting unit; the light distribution changing structure of the optical action plate is arranged along the predetermined axis direction of the light emitting unit. The light distribution changing structure of the optical action plate is provided inside the effective optical range of the optical action plate with respect to a direction perpendicular to the predetermined axial direction. It is arranged only in a part of the range.

前記光学作用板の配光変更構造は、前記所定の軸方向に沿った有効光学範囲の一部分の範囲にのみ配置することができる。 The light distribution changing structure of the optical action plate can be arranged only in a part of the effective optical range along the predetermined axial direction.

前記光学作用板の配光変更構造は、前記光学作用板の光の入射面と出射面のいずれか一方の面のみに設けることができる。 The light distribution changing structure of the optical action plate can be provided on only one of the light incident surface and the light emission surface of the optical action plate.

前記光学作用板のうち前記配光変更構造が設けられていない側の面は、前記所定の軸方向と平行な軸に対して軸対称な形状を有することができる。 The surface of the optical action plate on the side where the light distribution changing structure is not provided may have an axisymmetric shape with respect to an axis parallel to the predetermined axial direction.

前記光学作用板のうち前記配光変更構造以外の前記垂直な方向の外側部分は、前記所定の軸方向と平行な軸に対して軸対称な形状を有することができる。 An outer portion of the optical action plate in the vertical direction other than the light distribution changing structure may have an axisymmetric shape with respect to an axis parallel to the predetermined axial direction.

前記光学作用板のうち前記配光変更構造以外の前記垂直な方向の外側部分は、前記所定の軸方向と平行な軸に対して軸対称な傾斜面（楔面）とすることができる。 An outer portion of the optical action plate other than the light distribution changing structure in the vertical direction can be an inclined surface (wedge surface) that is axisymmetric with respect to an axis parallel to the predetermined axial direction.

前記光学作用板のうち前記配光変更構造以外の前記垂直な方向の外側部分は、前記所定の軸方向と平行な軸に対して軸対称な曲面（シリンダ面）とすることができる。 An outer portion of the optical action plate other than the light distribution changing structure in the vertical direction can be a curved surface (cylinder surface) that is axisymmetric with respect to an axis parallel to the predetermined axial direction.

前記光学作用板の配光変更構造は、前記発光部からの光を拡散させる拡散面からなり、この拡散面は、前記光学作用板の中心部と周辺部とでその拡散力を異ならせることができる。 The light distribution changing structure of the optical action plate includes a diffusion surface that diffuses light from the light emitting portion, and the diffusion surface may have different diffusing forces between a central portion and a peripheral portion of the optical action plate. it can.

前記拡散面は、前記所定の軸方向に沿って見たとき、前記光学作用板の中心側より周辺側の拡散力を強くすることができる。 When viewed along the predetermined axial direction, the diffusing surface can increase the diffusing force on the peripheral side from the center side of the optical action plate.

前記拡散面は、四角錐状の多数の窪み又は突起から構成することができる。 The diffusion surface can be composed of a number of square pyramid-shaped depressions or protrusions.

前記光学作用板は、前記発光部からの光の光路上から挿脱可能とすることができる。 The optical action plate can be inserted and removed from the optical path of the light from the light emitting unit.

本発明のフラッシュ装置は、上述したいずれかの配光装置を備えることを特徴としている。 The flash device of the present invention is characterized by including any of the light distribution devices described above.

本発明のフラッシュ装置は、その一態様では、所定の軸方向に沿って配置された発光部と、この発光部からの光を所定の範囲に配光するための光学作用板とを備えたフラッシュ装置であって、前記光学作用板は、前記発光部からの光の配光を変更するための配光変更構造を有していること；前記光学作用板の配光変更構造は、前記所定の軸方向に沿って前記発光部の有効発光長よりも外側の部分に設けられていること；及び前記光学作用板の配光変更構造は、前記所定の軸方向に垂直な方向に対し、前記光学作用板の有効光学範囲の内側の一部分の範囲にのみ配置されていること；を特徴としている。 In one aspect, the flash device of the present invention includes a light emitting unit disposed along a predetermined axial direction, and an optical action plate for distributing light from the light emitting unit to a predetermined range. The optical action plate has a light distribution changing structure for changing the light distribution from the light emitting unit; the light distribution changing structure of the optical action plate is the predetermined light distribution structure. A light distribution change structure of the optical action plate is provided in a portion perpendicular to the predetermined axial direction; It is arranged only in a part of the inside of the effective optical range of the working plate.

本発明のフラッシュ装置は、別の態様では、所定の軸方向に延びる発光部と、この発光部からの光を反射するリフレクタと、少なくとも一方の面にフレネル形状をもつ仲介配光作用板と、この仲介配光作用板から照射された光を所定の範囲に配光するための光学作用板とを備えたフラッシュ装置であって、前記光学作用板は、前記発光部からの光の配光を変更するための配光変更構造を有していること；及び前記光学作用板の配光変更構造は、前記所定の軸に垂直な方向に対し、前記光学作用板の有効光学範囲の内側の一部分の範囲にのみ配置されていること；を特徴としている。 According to another aspect of the flash device of the present invention, a light emitting portion extending in a predetermined axial direction, a reflector that reflects light from the light emitting portion, an intermediary light distribution action plate having a Fresnel shape on at least one surface, A flash device including an optical action plate for distributing light emitted from the intermediary light distribution action plate to a predetermined range, wherein the optical action plate distributes light from the light emitting unit. A light distribution changing structure for changing; and the light distribution changing structure of the optical action plate is a part inside the effective optical range of the optical action plate with respect to a direction perpendicular to the predetermined axis. It is characterized by being arranged only in the range.

本発明によれば、所望の配光範囲に自然に配光することができる配光装置及びこれを備えたフラッシュ装置が得られる。 ADVANTAGE OF THE INVENTION According to this invention, the light distribution apparatus which can distribute light naturally in a desired light distribution range, and a flash apparatus provided with the same are obtained.

図１（Ａ）、（Ｂ）は、発光部の有効発光長を説明するための図であり、図１（Ａ）は発光部の軸方向の両端部からの光の遮光部が存在する場合、図１（Ｂ）は発光部の軸方向の両端部からの光の遮光部が存在しない場合をそれぞれ示している。また図１（Ｃ）は、図１（Ｂ）の発光部をリフレクタ（反射板）と組み合わせた場合の図であり、発光部を覆う部分のリフレクタの両端部は発光部より短い構造になっており、リフレクタよりはみ出た発光部の両端は図１（Ａ）と同様の遮光部とみなせる状態を示したものである。FIGS. 1A and 1B are diagrams for explaining the effective light emission length of the light emitting unit, and FIG. 1A shows a case where there are light shielding units from both ends in the axial direction of the light emitting unit. FIG. 1B shows a case where there are no light shielding portions from both ends of the light emitting portion in the axial direction. FIG. 1C is a diagram in the case where the light emitting portion of FIG. 1B is combined with a reflector (reflecting plate), and both ends of the reflector covering the light emitting portion have a structure shorter than the light emitting portion. In addition, both ends of the light emitting portion that protrudes from the reflector are in a state that can be regarded as a light shielding portion similar to that shown in FIG. 図２（Ａ）、（Ｂ）、（Ｃ）は、光学作用板の有効光学範囲を説明するための図であり、図２（Ａ）は光学作用板の遮光部によって光学作用板の有効光学範囲が規定される場合、図２（Ｂ）は発光部のリフレクタによって光学作用板の有効光学範囲が規定される場合、図２（Ｃ）は光学作用板の全面が有効光学範囲となる場合をそれぞれ示している。FIGS. 2A, 2B, and 2C are diagrams for explaining the effective optical range of the optical action plate. FIG. 2A shows the effective optics of the optical action plate by the light shielding portion of the optical action plate. When the range is defined, FIG. 2B shows the case where the effective optical range of the optical action plate is prescribed by the reflector of the light emitting unit, and FIG. 2C shows the case where the entire surface of the optical action plate becomes the effective optical range. Each is shown. 図３（Ａ）、（Ｂ）は、光学作用板の配光変更構造（拡散面）の一例を示す平面図、断面図である。3A and 3B are a plan view and a cross-sectional view showing an example of the light distribution changing structure (diffusion surface) of the optical action plate. 挿脱可能な光学作用板の離脱状態におけるフラッシュ装置の外観斜視図である。It is an external appearance perspective view of the flash apparatus in the detached state of the optical action plate which can be inserted or removed. 挿脱可能な光学作用板の離脱状態におけるフラッシュ装置の断面図である。It is sectional drawing of the flash apparatus in the detachment | leave state of the optical action plate which can be inserted or removed. 挿脱可能な光学作用板の挿入状態におけるフラッシュ装置の外観斜視図である。It is an external appearance perspective view of the flash apparatus in the insertion state of the optical action plate which can be inserted or removed. 挿脱可能な光学作用板の挿入状態におけるフラッシュ装置の断面図である。It is sectional drawing of the flash apparatus in the insertion state of the optical action plate which can be inserted or removed. 本発明の実施例１の光学作用板の配光変更構造（拡散面）を示す平面図である。It is a top view which shows the light distribution change structure (diffusion surface) of the optical action board of Example 1 of this invention. 本発明の実施例１の光学作用板の配光変更構造（拡散面）を示す断面図である。It is sectional drawing which shows the light distribution change structure (diffusion surface) of the optical action board of Example 1 of this invention. 図８のように構成された光学作用板による光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a figure which shows the illuminance ratio distribution of the light by the optical action board comprised as shown in FIG. 8 on the plane of 3 m of subject distance. 本発明の実施例２の光学作用板の配光変更構造（拡散面）を示す平面図である。It is a top view which shows the light distribution change structure (diffusion surface) of the optical action board of Example 2 of this invention. 図１０のように構成された光学作用板による光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a figure which shows the illuminance ratio distribution of the light by the optical action board comprised like FIG. 10 on the plane of 3 m of subject distance. 本発明の実施例３の光学作用板の配光変更構造（拡散面）を示す平面図である。It is a top view which shows the light distribution change structure (diffusion surface) of the optical action board of Example 3 of this invention. 図１２のように構成された光学作用板による光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a figure which shows the illuminance ratio distribution of the light by the optical action board comprised like FIG. 12 on the plane of 3 m of object distance. 本発明の実施例４の光学作用板の配光変更構造（拡散面）を示す平面図である。It is a top view which shows the light distribution change structure (diffusion surface) of the optical action board of Example 4 of this invention. 図１４のように構成された光学作用板による光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a figure which shows the illuminance ratio distribution of the light by the optical action board comprised like FIG. 14 on the plane of object distance 3m. 本発明の実施例５の光学作用板の配光変更構造（拡散面）を示す平面図である。It is a top view which shows the light distribution change structure (diffusion surface) of the optical action board of Example 5 of this invention. 図１６のように構成された光学作用板による光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a figure which shows the illuminance ratio distribution of the light by the optical action board comprised like FIG. 16 on the plane of 3 m of subject distance. 本発明の光学作用板が離脱状態にあるときのマスター光学系のみの光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a figure which shows the illuminance ratio distribution of the light of only a master optical system when the optical action board of this invention is in a detachment | leave state on the plane of object distance 3m. 本発明の優位性を示すための比較例であり、光学作用板の有効光学範囲の全範囲に配光変更構造（拡散面）を設けたときの光の照度比分布を被写体距離３ｍの平面上に示す図である。It is a comparative example for showing the superiority of the present invention, and shows the illuminance ratio distribution of light when a light distribution changing structure (diffusion surface) is provided in the entire effective optical range of the optical action plate on a plane with a subject distance of 3 m. FIG.

＜本発明の原理説明＞
まず、図１〜図３を参照して、特許請求の範囲の発明特定要素の文言を定義しつつ、本発明による配光装置及びこれを備えたフラッシュ装置の原理説明を行う。 <Description of Principle of the Present Invention>
First, with reference to FIG. 1 to FIG. 3, the principle of the light distribution device according to the present invention and the flash device including the same will be described while defining the wording of the invention specific elements in the claims.

本発明のフラッシュ装置は、所定の軸方向に延びる（沿って配置された）発光部１００と、この発光部１００からの光を所定の範囲に配光するための光学作用板（配光作用板、配光装置、第２の配光作用板）２００とを有している。光学作用板２００は、発光部１００の軸方向と平行な面内に位置する、同軸方向に長い平面視略矩形の板状部材からなっている。以下、光学作用板２００の発光部１００の軸方向と平行な方向を長手方向、該長手方向と直交する（垂直な）方向を短手方向と定義する。 The flash device of the present invention includes a light emitting unit 100 extending (arranged) in a predetermined axial direction, and an optical action plate (light distribution action plate) for distributing light from the light emitting part 100 to a predetermined range. , Light distribution device, second light distribution action plate) 200. The optical action plate 200 is formed of a plate-like member that is located in a plane parallel to the axial direction of the light emitting unit 100 and is substantially rectangular in plan view and long in the coaxial direction. Hereinafter, a direction parallel to the axial direction of the light emitting unit 100 of the optical action plate 200 is defined as a longitudinal direction, and a direction perpendicular (perpendicular) to the longitudinal direction is defined as a short direction.

発光部１００は、所定の軸方向に延びるキセノンランプ等の各種ランプ又は閃光管、所定の軸方向に並んで配置された複数のＬＥＤ光源（ＬＥＤチップが並んだ一体型ＬＥＤアレイ光源）から構成することができ、その光源には自由度がある（軸方向に延びる発光部が、光学作用板２００に向けて光を発することができればよい）。 The light emitting unit 100 includes various lamps such as a xenon lamp or a flash tube extending in a predetermined axial direction, and a plurality of LED light sources (an integrated LED array light source in which LED chips are aligned) arranged side by side in a predetermined axial direction. The light source has a degree of freedom (it is sufficient if the light emitting portion extending in the axial direction can emit light toward the optical action plate 200).

図１（Ａ）に示すように、発光部１００の軸方向の両端部からの光の遮光部が存在する場合、この遮光部によって「発光部１００の有効発光長」が規定される。図１（Ｂ）に示すように、発光部１００の軸方向の両端部からの光の遮光部が存在しない場合、発光部１００の全長（軸方向の両端部）によって「発光部１００の有効発光長」が規定される。また図１（Ｃ）のように図１（Ｂ）の発光部１００をリフレクタと組み合わせた例では発光部１００を覆う部分のリフレクタの両端部が発光部より短い構造になっている場合がある。この場合はリフレクタよりはみ出た発光部１００の両端から発する光は利用されないため、発光部１００を覆うリフレクタ部分の長さによって「発光部１００の有効発光長」が規定される。 As shown in FIG. 1A, when there are light shielding portions from both ends of the light emitting portion 100 in the axial direction, the “effective light emission length of the light emitting portion 100” is defined by the light shielding portions. As shown in FIG. 1B, when there are no light shielding portions from both ends in the axial direction of the light emitting unit 100, “effective light emission of the light emitting unit 100 is caused by the total length of the light emitting unit 100 (both ends in the axial direction). “Length” is defined. Further, in the example in which the light emitting unit 100 in FIG. 1B is combined with a reflector as shown in FIG. 1C, both ends of the reflector that covers the light emitting unit 100 may be shorter than the light emitting unit. In this case, since the light emitted from both ends of the light emitting unit 100 protruding from the reflector is not used, the “effective light emission length of the light emitting unit 100” is defined by the length of the reflector part covering the light emitting unit 100.

光学作用板２００は、透光性を有する材料で構成されており、その一部または全部が有効光学範囲となっている。本明細書で「光学作用板２００の有効光学範囲」とは、光学作用板２００のうち発光部１００の光源からの光が到達する範囲を意味している。 The optical action plate 200 is made of a light-transmitting material, and part or all of it is in the effective optical range. In this specification, the “effective optical range of the optical action plate 200” means a range in the optical action plate 200 where light from the light source of the light emitting unit 100 reaches.

図２（Ａ）では、光学作用板２００の短手方向（軸直交方向）の両端部の遮光部によって光学作用板２００の短手方向（軸直交方向）の有効光学範囲が規定されている。図２（Ｂ）では、発光部１００のリフレクタによって光学作用板２００の短手方向（軸直交方向）の有効光学範囲が規定されている。リフレクタと光学作用板２００は通常一定の間隔が確保されるので、光学作用板２００の入射面の有効光学範囲はリフレクタの開口部よりもやや広くなる。また、光学作用板２００の射出面の有効光学範囲は入射面の有効光学範囲よりも広くなる。なお、光学作用板２００の射出面の有効光学範囲は少なくとも光学作用板２００の厚さと屈折作用の影響を受ける。図２（Ｃ）では、光学作用板２００の有効光学範囲を規定する遮光部やリフレクタが存在せず、光学作用板２００の全面が有効光学範囲となっている。 In FIG. 2A, the effective optical range in the short direction (axial orthogonal direction) of the optical action plate 200 is defined by the light shielding portions at both ends in the short direction (axial orthogonal direction) of the optical action plate 200. In FIG. 2B, the effective optical range in the short direction (axial orthogonal direction) of the optical action plate 200 is defined by the reflector of the light emitting unit 100. Since the reflector and the optical action plate 200 are usually kept at a constant distance, the effective optical range of the incident surface of the optical action plate 200 is slightly wider than the opening of the reflector. Further, the effective optical range of the exit surface of the optical action plate 200 is wider than the effective optical range of the entrance surface. The effective optical range of the exit surface of the optical action plate 200 is affected at least by the thickness of the optical action plate 200 and the refractive action. In FIG. 2C, there is no light-shielding part or reflector that defines the effective optical range of the optical action plate 200, and the entire surface of the optical action plate 200 is the effective optical range.

光学作用板２００は、発光部１００からの光の配光（リフレクタやフレネルレンズ等を介して光学作用板２００に達した光の配光も含む）を変更するための配光変更構造２１０を有している（これを発明特定要素１と呼ぶことがある）。以下では、光学作用板２００の配光変更構造２１０を、発光部１００からの光を拡散させる拡散面とした場合を例示する。 The optical action plate 200 has a light distribution changing structure 210 for changing the light distribution from the light emitting unit 100 (including the light distribution reaching the optical action plate 200 via a reflector, a Fresnel lens, or the like). (This may be referred to as invention specific element 1). Hereinafter, a case where the light distribution changing structure 210 of the optical action plate 200 is a diffusion surface that diffuses light from the light emitting unit 100 will be exemplified.

図３（Ａ）、（Ｂ）は、光学作用板２００の配光変更構造（拡散面）２１０の一例を示しており、光学作用板２００の全面が有効光学範囲であること（図２（Ｃ））を前提としている。同図において、光学作用板２００の拡散面２１０は、矩形の領域に四角錐状の多数の窪み又は突起を配置した同一形状の部分が２つ設けられており、この２つの拡散面２１０が、短手方向（発光部１００が延びる所定の軸方向と直交する方向）の位置を同じくし、かつ、長手方向（発光部１００が延びる所定の軸方向）に離間して配置されている。 3A and 3B show an example of the light distribution changing structure (diffusion surface) 210 of the optical action plate 200, and the entire surface of the optical action plate 200 is in the effective optical range (FIG. 2C )). In the figure, the diffusing surface 210 of the optical action plate 200 is provided with two parts having the same shape in which a large number of square pyramid-shaped depressions or protrusions are arranged in a rectangular region. The positions in the short direction (the direction perpendicular to the predetermined axial direction in which the light emitting unit 100 extends) are the same, and are spaced apart in the longitudinal direction (the predetermined axial direction in which the light emitting unit 100 extends).

２つの拡散面２１０は、それぞれ、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長の内側と外側の部分に跨って配置されている。つまり光学作用板２００の拡散面２１０は、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長よりも外側の部分に延長させて設けられている（これを発明特定要素２と呼ぶことがある）。また光学作用板２００の拡散面２１０は、長手方向（発光部１００が延びる所定の軸方向）に沿った有効光学範囲の一部分の範囲のみに配置されている。 The two diffusing surfaces 210 are respectively disposed across the inner and outer portions of the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). That is, the diffusing surface 210 of the optical action plate 200 is provided so as to extend to a portion outside the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends) (this). May be referred to as invention specific element 2). Further, the diffusing surface 210 of the optical action plate 200 is disposed only in a part of the effective optical range along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends).

光学作用板２００の拡散面２１０は、短手方向（発光部１００が延びる所定の軸方向と直交する方向）に対し、光学作用板２００の有効光学範囲の内側の一部分の範囲にのみ配置されている（これを発明特定要素３と呼ぶことがある）。 The diffusing surface 210 of the optical action plate 200 is arranged only in a part of the inner side of the effective optical range of the optical action plate 200 with respect to the short side direction (direction orthogonal to the predetermined axial direction in which the light emitting unit 100 extends). (This may be called invention specific element 3).

光学作用板２００のうち拡散面２１０以外の短手方向（発光部１００が延びる所定の軸方向と直交する方向）の外側部分は、長手方向（発光部１００が延びる所定の軸方向）と平行な軸に対して軸対称な形状、例えば傾斜面（楔面）や曲面（シリンダ面）とすることができる。これにより、特に短手方向（発光部１００が延びる所定の軸方向と直交する方向）において広い照射範囲を確保する効果を顕著に得ることができる。 An outer portion of the optical action plate 200 in the short direction other than the diffusing surface 210 (a direction orthogonal to a predetermined axial direction in which the light emitting unit 100 extends) is parallel to the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). The shape may be axisymmetric with respect to the axis, for example, an inclined surface (wedge surface) or a curved surface (cylinder surface). Thereby, the effect which ensures a wide irradiation range can be acquired notably in a transversal direction (direction orthogonal to the predetermined axial direction where the light emission part 100 is extended).

光学作用板２００の配光変更構造（拡散面）２１０は、光学作用板２００の光の入射面と出射面のいずれか一方の面のみに設ける態様、及び、光学作用板２００の光の入射面と出射面の両面に設ける態様が可能である。前者の態様では、光学作用板２００のうち配光変更構造（拡散面）２１０が設けられていない側の面は、長手方向（発光部１００が延びる所定の軸方向）と平行な軸に対して軸対称な形状を有することができる。これにより、広い照射範囲を確保する効果を顕著に得ることができる。また前者の態様は、入射面と出射面の２面分の成形型を加工する必要がないので、製造面とコスト面で有利である。 The light distribution changing structure (diffusion surface) 210 of the optical action plate 200 is provided on only one of the light incident surface and the light exit surface of the optical action plate 200, and the light incident surface of the optical action plate 200. And an embodiment in which both sides of the light exit surface are provided. In the former mode, the surface of the optical action plate 200 on the side where the light distribution changing structure (diffusion surface) 210 is not provided is with respect to an axis parallel to the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). It can have an axisymmetric shape. Thereby, the effect which ensures a wide irradiation range can be acquired notably. In addition, the former mode is advantageous in terms of manufacturing and cost because it is not necessary to process a mold for two surfaces of the entrance surface and the exit surface.

本発明者は、鋭意研究の結果、上述した発明特定要素１−３を満足することにより、広い照射範囲を確保しつつ、所望の配光範囲により少ない光量ロスで高い照度の光をムラの少ない自然な配光することができることを見出した。すなわち、本発明のコンセプトは、縦断面（軸直交方向断面）と横断面（軸方向断面）の二次元的に配光ムラを考慮し、所望の範囲にだけムラなく光を到達させるために、配光変更構造（拡散面）２１０の配置を最適化した点にある。また光学作用板２００に入射する光を配光変更（拡散）する部分としない部分を適切に配分することで、光量ロスを減らし、高い照度の光を広範囲にわたって維持することができるのである。 As a result of diligent research, the present inventor has satisfied the above-described invention specific element 1-3, and while ensuring a wide irradiation range, the light distribution with high light intensity with less loss of light in the desired light distribution range is less uneven. It was found that natural light distribution can be achieved. That is, the concept of the present invention is to consider uneven light distribution two-dimensionally in a longitudinal section (axial orthogonal section) and a transverse section (axial section), in order to allow light to reach the desired range without unevenness. The arrangement of the light distribution changing structure (diffusion surface) 210 is optimized. In addition, by appropriately allocating the light incident on the optical action plate 200 as the portion that does not change (diffuse) the light distribution, it is possible to reduce the light loss and maintain high illuminance light over a wide range.

＜マスター光学系と光学作用板の挿脱機構を含むフラッシュ装置の構成説明＞
続いて、図４−図７を参照して、マスター光学系と光学作用板の挿脱機構を含む挿脱可能な光学作用板（一般にワイドパネルと呼ばれるもの）を有するフラッシュ装置の構成説明を行う。 <Description of the configuration of the flash unit including the insertion / removal mechanism for the master optical system and optical action plate>
Next, with reference to FIG. 4 to FIG. 7, the configuration of a flash device having a removable optical action plate (generally called a wide panel) including a master optical system and an optical action plate insertion / removal mechanism will be described. .

フラッシュ装置１０は、予めユニット化されたマスター光学系として、被写体に供給するための光を発する光源１１０（発光部１００）と、この光源１１０が発した光を反射するリフレクタ１２０（発光部１００）と、このリフレクタ１２０が反射した光、及び直接光源１１０を発した光を配光する仲介光学作用板（仲介配光作用板、第１の配光作用板）１３０とを有している。仲介光学作用板１３０の出射面（被写体側の面）には、フレネル面（フレネル形状）１３５が形成されている。 The flash device 10 includes a light source 110 (light emitting unit 100) that emits light to be supplied to a subject and a reflector 120 (light emitting unit 100) that reflects light emitted from the light source 110 as a master optical system that is unitized in advance. And a mediating optical action plate (mediation light distribution action plate, first light distribution action plate) 130 that distributes the light reflected by the reflector 120 and the light directly emitted from the light source 110. A Fresnel surface (Fresnel shape) 135 is formed on the exit surface (subject side surface) of the intermediate optical action plate 130.

光学作用板（配光作用板、配光装置、第２の配光作用板）２００は、マスター光学系からの光の光路上に位置する挿入位置（図６、図７）と、マスター光学系からの光の光路上から離脱した離脱位置（図４、図５）との間で挿脱可能となっている。光学作用板２００は、光軸方向（図５、図７の左右方向）にスライド自在なヒンジ軸２０５を中心にして回動可能になっている。図６、図７に示すように、ヒンジ軸２０５が光軸方向の前方端に移動すると、光学作用板２００がヒンジ軸２０５を中心に回動して仲介光学作用板１３０の前方に位置する挿入状態となる。図４、図５に示すように、ヒンジ軸２０５が光軸方向の後方端に移動すると、光学作用板２００がヒンジ軸２０５と一緒にマスター光学系の上方空間に収納された離脱状態となる。 An optical action plate (light distribution action plate, light distribution device, second light distribution action plate) 200 includes an insertion position (FIGS. 6 and 7) located on the optical path of light from the master optical system, and the master optical system. It is possible to insert / remove to / from the separation position (FIGS. 4 and 5) where the light is separated from the light path of the light. The optical action plate 200 is rotatable about a hinge shaft 205 that is slidable in the optical axis direction (left and right direction in FIGS. 5 and 7). As shown in FIGS. 6 and 7, when the hinge shaft 205 moves to the front end in the optical axis direction, the optical action plate 200 rotates about the hinge axis 205 and is positioned in front of the intermediate optical action plate 130. It becomes a state. As shown in FIGS. 4 and 5, when the hinge shaft 205 moves to the rear end in the optical axis direction, the optical action plate 200 is separated from the master optical system together with the hinge shaft 205.

＜光学作用板の配光変更構造（拡散面）のバリエーションの説明＞
続いて、具体的な実施例１−５を参照して、光学作用板２００の配光変更構造（拡散面）２１０のバリエーションについて説明する。 <Description of variations of light distribution change structure (diffusion surface) of optical action plate>
Next, variations of the light distribution changing structure (diffusion surface) 210 of the optical action plate 200 will be described with reference to specific Example 1-5.

（実施例１）
図８Ａ、図８Ｂは、それぞれ、本発明の実施例１の光学作用板２００の配光変更構造（拡散面）２１０Ａを示す平面図、断面図である（図１０、図１２、図１４、図１６では平面図のみを示して断面図を省略している）。図９は、図８Ａ、図８Ｂのように構成された光学作用板２００をマスター光学系に組み合わせた状態による光の照度比分布を示す図である。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。 (Example 1)
8A and 8B are a plan view and a cross-sectional view, respectively, showing a light distribution changing structure (diffusion surface) 210A of the optical action plate 200 of Embodiment 1 of the present invention (FIGS. 10, 12, 14, and FIG. 8). 16 shows only a plan view and omits a cross-sectional view). FIG. 9 is a diagram showing the illuminance ratio distribution of light in a state where the optical action plate 200 configured as shown in FIGS. 8A and 8B is combined with the master optical system. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram.

図８Ａ、図８Ｂに示すように、光学作用板２００の拡散面２１０Ａは、光学作用板２００の光の入射面に設けられており、光学作用板２００の光の出射面は平面となっている。光学作用板２００の拡散面２１０Ａは、矩形の領域に四角錐状の多数の窪み又は突起を配置した同一形状の部分が２つ設けられており、この２つの拡散面２１０Ａが、短手方向（発光部１００が延びる所定の軸方向と直交する方向）の位置を同じくし、かつ、長手方向（発光部１００が延びる所定の軸方向）に離間して配置されている。 As shown in FIGS. 8A and 8B, the diffusion surface 210A of the optical action plate 200 is provided on the light incident surface of the optical action plate 200, and the light emission surface of the optical action plate 200 is a flat surface. . The diffusing surface 210A of the optical action plate 200 is provided with two parts having the same shape in which a large number of quadrangular pyramid-shaped depressions or protrusions are arranged in a rectangular region, and the two diffusing surfaces 210A are arranged in the short direction ( The light emitting unit 100 is disposed at the same position in a direction orthogonal to the predetermined axial direction in which the light emitting unit 100 extends, and is spaced apart in the longitudinal direction (the predetermined axial direction in which the light emitting unit 100 extends).

２つの拡散面２１０Ａは、それぞれ、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長の内側と外側の部分に跨って配置されている。つまり光学作用板２００の拡散面２１０Ａは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長よりも外側の部分に設けられている。また光学作用板２００の拡散面２１０Ａは、長手方向（発光部１００が延びる所定の軸方向）に沿った有効光学範囲の一部分の範囲のみに配置されている。 Each of the two diffusion surfaces 210A is disposed across the inner and outer portions of the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). That is, the diffusing surface 210 A of the optical action plate 200 is provided in a portion outside the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). Further, the diffusing surface 210A of the optical action plate 200 is disposed only in a part of the effective optical range along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends).

光学作用板２００の拡散面２１０Ａは、短手方向（発光部１００が延びる所定の軸方向と直交する方向）に対し、光学作用板２００の有効光学範囲の内側の一部分の範囲にのみ配置されている。 The diffusing surface 210A of the optical action plate 200 is arranged only in a part of the inner side of the effective optical range of the optical action plate 200 with respect to the short side direction (direction orthogonal to the predetermined axial direction in which the light emitting unit 100 extends). Yes.

光学作用板２００のうち拡散面２１０Ａ以外の短手方向（発光部１００が延びる所定の軸方向と直交する方向）の外側部分は、長手方向（発光部１００が延びる所定の軸方向）と平行な軸に対して軸対称な曲面（シリンダ面）となっている。 An outer portion of the optical action plate 200 in a short direction (a direction orthogonal to a predetermined axial direction in which the light emitting unit 100 extends) other than the diffusion surface 210A is parallel to a longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). The curved surface (cylinder surface) is axisymmetric with respect to the axis.

図９に示すように、本発明の実施例１の光学作用板２００の配光変更構造（拡散面）２１０Ａによれば、広い照射範囲を確保しつつ、所望の配光範囲により少ない光量ロスで高い照度の光を自然に配光することができる。 As shown in FIG. 9, according to the light distribution changing structure (diffusion surface) 210 A of the optical action plate 200 according to the first embodiment of the present invention, while securing a wide irradiation range, with less light loss in a desired light distribution range. High illuminance light can be distributed naturally.

（実施例２）
図１０は、本発明の実施例２の光学作用板２００の配光変更構造（拡散面）２１０Ｂを示す図である。図１１は、図１０のように構成された光学作用板２００をマスター光学系に組み合わせた状態による光の照度比分布を示す図である。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。 (Example 2)
FIG. 10 is a diagram illustrating a light distribution changing structure (diffusion surface) 210B of the optical action plate 200 according to the second embodiment of the present invention. FIG. 11 is a diagram showing the illuminance ratio distribution of light in a state where the optical action plate 200 configured as shown in FIG. 10 is combined with the master optical system. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram.

図１０に示すように、光学作用板２００の拡散面２１０Ｂは、光学作用板２００の光の入射面に設けられており、光学作用板２００の光の出射面は曲面（シリンダ面）となっている。光学作用板２００の拡散面２１０Ｂは、実施例１の拡散面２１０Ａ（図８）と同様の形状で且つその長手方向のサイズ（幅）を小さくした（縮めた）ものである。光学作用板２００のうち拡散面２１０Ｂ以外の短手方向（発光部１００が延びる所定の軸方向と直交する方向）の外側部分は、平面となっている。 As shown in FIG. 10, the diffusion surface 210B of the optical action plate 200 is provided on the light incident surface of the optical action plate 200, and the light emission surface of the optical action plate 200 is a curved surface (cylinder surface). Yes. The diffusing surface 210B of the optical action plate 200 has the same shape as the diffusing surface 210A (FIG. 8) of the first embodiment, and the size (width) in the longitudinal direction is reduced (shrinked). The outer portion of the optical action plate 200 in the short direction other than the diffusion surface 210B (in the direction orthogonal to the predetermined axial direction in which the light emitting unit 100 extends) is a flat surface.

図１１に示すように、本発明の実施例２の光学作用板２００の配光変更構造（拡散面）２１０Ｂによれば、広い照射範囲を確保しつつ、所望の配光範囲により少ない光量ロスで高い照度の光を自然に配光することができる。 As shown in FIG. 11, according to the light distribution changing structure (diffusion surface) 210 B of the optical action plate 200 according to the second embodiment of the present invention, while securing a wide irradiation range, the light distribution loss can be reduced with a desired light distribution range. High illuminance light can be distributed naturally.

（実施例３）
図１２は、本発明の実施例３の光学作用板２００の配光変更構造（拡散面）２１０Ｃを示す図である。図１３は、図１２のように構成された光学作用板２００をマスター光学系に組み合わせた状態による光の照度比分布を示す図である。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。 Example 3
FIG. 12 is a diagram illustrating a light distribution changing structure (diffusion surface) 210C of the optical action plate 200 according to the third embodiment of the present invention. FIG. 13 is a diagram showing the illuminance ratio distribution of light in a state where the optical action plate 200 configured as shown in FIG. 12 is combined with the master optical system. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram.

図１２に示すように、光学作用板２００の拡散面２１０Ｃは、光学作用板２００の光の入射面に設けられている。光学作用板２００の光の出射面は、短手方向の中心部が平面となっており、短手方向の周辺部が傾斜面（楔面）となっている。光学作用板２００の拡散面２１０Ｃは、長手方向の中心の矩形の領域に四角錐状の多数の窪み又は突起を配置した拡散面２１０Ｃ１と、この拡散面２１０Ｃ１の長手方向の両端部に隣接する（連続する）矩形の領域に四角錐状の多数の窪み又は突起を配置した同一形状の２つの拡散面２１０Ｃ２とを有している。中心部の拡散面２１０Ｃ１は、周辺部の拡散面２１０Ｃ２よりも浅い（又は粗い）拡散面となっており、拡散面２１０Ｃの拡散力が、光学作用板２００の中心部と周辺部とで異なっている。より具体的に、拡散面２１０Ｃは、長手方向（発光部１００が延びる所定の軸方向）に沿って見たとき、光学作用板２００の中心部から周辺部に向かうに連れてその拡散力が強くなる（中心側より周辺側の拡散力が強くなる）。 As shown in FIG. 12, the diffusing surface 210 C of the optical action plate 200 is provided on the light incident surface of the optical action plate 200. The light exit surface of the optical action plate 200 has a flat central portion in the short direction, and a peripheral portion in the short direction is an inclined surface (wedge surface). The diffusing surface 210C of the optical action plate 200 is adjacent to the diffusing surface 210C1 in which a large number of quadrangular pyramid-shaped depressions or protrusions are arranged in the central rectangular region in the longitudinal direction, and to both ends of the diffusing surface 210C1 in the longitudinal direction ( It has two diffusing surfaces 210C2 having the same shape in which a large number of quadrangular pyramid-shaped depressions or protrusions are arranged in a rectangular region that is continuous. The central diffusion surface 210C1 is a shallower (or rougher) diffusion surface than the peripheral diffusion surface 210C2, and the diffusion force of the diffusion surface 210C differs between the central portion and the peripheral portion of the optical action plate 200. Yes. More specifically, when viewed along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends), the diffusing surface 210C has a diffusing force that increases from the center to the periphery of the optical action plate 200. (The diffusion power on the peripheral side becomes stronger than the central side).

拡散面２１０Ｃは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長の内側と外側の部分に跨って配置されている。つまり光学作用板２００の拡散面２１０Ｃは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長よりも外側の部分に設けられている。また光学作用板２００の拡散面２１０Ｃは、長手方向（発光部１００が延びる所定の軸方向）に沿った有効光学範囲の一部分の範囲のみに配置されている。 The diffusing surface 210C is disposed across the inner and outer portions of the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). That is, the diffusing surface 210 C of the optical action plate 200 is provided in a portion outside the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). Further, the diffusing surface 210C of the optical action plate 200 is disposed only in a part of the effective optical range along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends).

光学作用板２００の拡散面２１０Ｃは、短手方向（発光部１００が延びる所定の軸方向と直交する方向）に対し、光学作用板２００の有効光学範囲の内側の一部分の範囲にのみ配置されている。 The diffusing surface 210 C of the optical action plate 200 is arranged only in a part of the inner side of the effective optical range of the optical action plate 200 with respect to the short direction (a direction orthogonal to a predetermined axial direction in which the light emitting unit 100 extends). Yes.

光学作用板２００のうち拡散面２１０Ｃ以外の短手方向（発光部１００が延びる所定の軸方向と直交する方向）の外側部分は、平面となっている。 The outer portion of the optical action plate 200 in the lateral direction other than the diffusing surface 210C (the direction perpendicular to the predetermined axial direction in which the light emitting unit 100 extends) is a flat surface.

図１３に示すように、本発明の実施例３の光学作用板２００の配光変更構造（拡散面）２１０Ｃによれば、広い照射範囲を確保しつつ、所望の配光範囲により少ない光量ロスで高い照度の光を自然に配光することができる。 As shown in FIG. 13, according to the light distribution changing structure (diffusion surface) 210 C of the optical action plate 200 according to the third embodiment of the present invention, while securing a wide irradiation range, it is possible to reduce the light amount loss in a desired light distribution range. High illuminance light can be distributed naturally.

（実施例４）
図１４は、本発明の実施例４の光学作用板２００の配光変更構造（拡散面）２１０Ｄを示す図である。図１５は、図１４のように構成された光学作用板２００をマスター光学系に組み合わせた状態による光の照度比分布を示す図である。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。 (Example 4)
FIG. 14 is a diagram illustrating a light distribution changing structure (diffusion surface) 210D of the optical action plate 200 according to the fourth embodiment of the present invention. FIG. 15 is a diagram showing the illuminance ratio distribution of light when the optical action plate 200 configured as shown in FIG. 14 is combined with the master optical system. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram.

図１４に示すように、光学作用板２００の拡散面２１０Ｄは、光学作用板２００の光の入射面に設けられており、光学作用板２００の光の出射面は曲面（シリンダ面）となっている。光学作用板２００の拡散面２１０Ｄは、長手方向と短手方向の中心部を除いてこれを囲んだ枠状をなしている。 As shown in FIG. 14, the diffusion surface 210D of the optical action plate 200 is provided on the light incident surface of the optical action plate 200, and the light emission surface of the optical action plate 200 is a curved surface (cylinder surface). Yes. The diffusing surface 210D of the optical action plate 200 has a frame shape that surrounds the diffusing surface 210D except for the central portion in the longitudinal direction and the lateral direction.

拡散面２１０Ｄは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長の内側と外側の部分に跨って配置されている。つまり光学作用板２００の拡散面２１０Ｄは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長よりも外側の部分に設けられている。また光学作用板２００の拡散面２１０Ｄは、長手方向（発光部１００が延びる所定の軸方向）に沿った有効光学範囲の一部分の範囲のみに配置されている。 The diffusion surface 210D is disposed across the inner and outer portions of the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). That is, the diffusing surface 210 D of the optical action plate 200 is provided in a portion outside the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). Further, the diffusing surface 210D of the optical action plate 200 is disposed only in a part of the effective optical range along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends).

光学作用板２００の拡散面２１０Ｄは、短手方向（発光部１００が延びる所定の軸方向と直交する方向）に対し、光学作用板２００の有効光学範囲の内側の一部分の範囲にのみ配置されている。 The diffusion surface 210D of the optical action plate 200 is arranged only in a part of the inner side of the effective optical range of the optical action plate 200 with respect to the short side direction (direction orthogonal to the predetermined axial direction in which the light emitting unit 100 extends). Yes.

光学作用板２００のうち拡散面２１０Ｄ以外の短手方向（発光部１００が延びる所定の軸方向と直交する方向）の外側部分は、平面となっている。 An outer portion of the optical action plate 200 in the lateral direction (direction perpendicular to the predetermined axial direction in which the light emitting unit 100 extends) other than the diffusion surface 210D is a flat surface.

図１５に示すように、本発明の実施例４の光学作用板２００の配光変更構造（拡散面）２１０Ｄによれば、広い照射範囲を確保しつつ、所望の配光範囲により少ない光量ロスで高い照度の光を自然に配光することができる。 As shown in FIG. 15, according to the light distribution changing structure (diffusion surface) 210 D of the optical action plate 200 according to the fourth embodiment of the present invention, while securing a wide irradiation range, the light distribution loss can be reduced with a desired light distribution range. High illuminance light can be distributed naturally.

（実施例５）
図１６は、本発明の実施例５の光学作用板２００の配光変更構造（拡散面）２１０Ｅを示す図である。図１７は、図１６のように構成された光学作用板２００をマスター光学系に組み合わせた状態による光の照度比分布を示す図である。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。 (Example 5)
FIG. 16 is a diagram showing a light distribution changing structure (diffusion surface) 210E of the optical action plate 200 according to the fifth embodiment of the present invention. FIG. 17 is a diagram showing the illuminance ratio distribution of light in a state where the optical action plate 200 configured as shown in FIG. 16 is combined with the master optical system. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram.

図１６に示すように、光学作用板２００の拡散面２１０Ｅは、光学作用板２００の光の入射面に設けられており、光学作用板２００の光の出射面は、平面となっている。光学作用板２００の拡散面２１０Ｅは、長手方向の中心の矩形の領域に四角錐状の多数の窪み又は突起を配置した拡散面２１０Ｅ１と、この拡散面２１０Ｅ１の長手方向の両端部に隣接する（連続する）矩形の領域に四角錐状の多数の窪み又は突起を配置した同一形状の２つの拡散面２１０Ｅ２とを有している。中心部の拡散面２１０Ｅ１は、周辺部の拡散面２１０Ｅ２よりも短手方向の長さが大きく設定されている。中心部の拡散面２１０Ｅ１は、周辺部の拡散面２１０Ｅ２よりも浅い（又は粗い）拡散面となっており、拡散面２１０Ｅの拡散力が、光学作用板２００の中心部と周辺部とで異なっている。より具体的に、拡散面２１０Ｅは、長手方向（発光部１００が延びる所定の軸方向）に沿って見たとき、光学作用板２００の中心部から周辺部に向かうに連れてその拡散力が強くなる（中心側より周辺側の拡散力が強くなる）。 As shown in FIG. 16, the diffusion surface 210E of the optical action plate 200 is provided on the light incident surface of the optical action plate 200, and the light emission surface of the optical action plate 200 is a flat surface. The diffusing surface 210E of the optical action plate 200 is adjacent to the diffusing surface 210E1 in which a large number of square pyramid-shaped depressions or protrusions are arranged in a rectangular region at the center in the longitudinal direction, and both ends of the diffusing surface 210E1 in the longitudinal direction ( It has two diffusing surfaces 210E2 having the same shape in which a large number of quadrangular pyramid-shaped depressions or protrusions are arranged in a rectangular region that is continuous. The central diffusion surface 210E1 has a shorter length than the peripheral diffusion surface 210E2. The central diffusion surface 210E1 is a shallower (or rougher) diffusion surface than the peripheral diffusion surface 210E2, and the diffusion force of the diffusion surface 210E differs between the central portion and the peripheral portion of the optical action plate 200. Yes. More specifically, when viewed along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends), the diffusing surface 210E has a diffusing force that increases from the center to the periphery of the optical action plate 200. (The diffusion power on the peripheral side becomes stronger than the central side).

拡散面２１０Ｅは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長の内側と外側の部分に跨って配置されている。つまり光学作用板２００の拡散面２１０Ｅは、長手方向（発光部１００が延びる所定の軸方向）に沿って、発光部１００の有効発光長よりも外側の部分に設けられている。また光学作用板２００の拡散面２１０Ｅは、長手方向（発光部１００が延びる所定の軸方向）に沿った有効光学範囲の一部分の範囲のみに配置されている。 The diffusion surface 210E is disposed across the inner and outer portions of the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). That is, the diffusing surface 210 E of the optical action plate 200 is provided in a portion outside the effective light emission length of the light emitting unit 100 along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends). Further, the diffusing surface 210E of the optical action plate 200 is disposed only in a part of the effective optical range along the longitudinal direction (a predetermined axial direction in which the light emitting unit 100 extends).

光学作用板２００の拡散面２１０Ｅは、短手方向（発光部１００が延びる所定の軸方向と直交する方向）に対し、光学作用板２００の有効光学範囲の内側の一部分の範囲にのみ配置されている。 The diffusing surface 210E of the optical action plate 200 is arranged only in a part of the inner side of the effective optical range of the optical action plate 200 with respect to the short side direction (direction orthogonal to the predetermined axial direction in which the light emitting unit 100 extends). Yes.

光学作用板２００のうち拡散面２１０Ｅ以外の短手方向（発光部１００が延びる所定の軸方向と直交する方向）の外側部分は、平面となっている。 An outer portion of the optical action plate 200 in the lateral direction other than the diffusing surface 210E (a direction orthogonal to a predetermined axial direction in which the light emitting unit 100 extends) is a flat surface.

図１７に示すように、本発明の実施例５の光学作用板２００の配光変更構造（拡散面）２１０Ｅによれば、広い照射範囲を確保しつつ、所望の配光範囲により少ない光量ロスで高い照度の光を自然に配光することができる。 As shown in FIG. 17, according to the light distribution changing structure (diffusion surface) 210E of the optical action plate 200 according to the fifth embodiment of the present invention, while securing a wide irradiation range, the light distribution loss can be reduced with a desired light distribution range. High illuminance light can be distributed naturally.

図１８は、光学作用板２００が離脱状態にあるときのマスター光学系のみでの光の照度比分布を示している。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。マスター光学系のみでは狭い配光範囲を明るく照明する目的で設計されている。具体的には図１８の照度比分布図の中央付近７５％の範囲に限定した部分を照明することを目的としており、そのため中心部の照度レベルが高い配光特性となっている。 FIG. 18 shows the illuminance ratio distribution of light only in the master optical system when the optical action plate 200 is in the detached state. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram. Only the master optical system is designed to illuminate a narrow light distribution range brightly. Specifically, the purpose is to illuminate a portion limited to a range of 75% in the vicinity of the center of the illuminance ratio distribution diagram of FIG. 18, so that the light distribution characteristic has a high illuminance level at the center.

図１９は、本発明の優位性を示すための比較例であり、光学作用板２００の有効光学範囲の全範囲に均一な配光変更構造（拡散面）を設けたものをマスター光学系に組み合わせた状態の光の照度分布を示している。また下段と右側の折れ線グラフは、それぞれ、光の照度比分布図の横中央断面、縦中央断面を示したものである。同図の比較例では、配光時（拡散時）の光量ロスが大きくなりすぎて平均的な照度レベルが大きく低下している。さらに配光ムラが顕著に発生しており、光学作用板２００の拡散効果が中心部に到達する光の多くを拡散してしまうためとりわけ中心部の照度が極めて低くなってしまう。 FIG. 19 is a comparative example for showing the superiority of the present invention, in which a uniform light distribution changing structure (diffusion surface) is provided in the entire effective optical range of the optical action plate 200 and combined with the master optical system. The illuminance distribution of the light in the above state is shown. In addition, the lower and right line graphs respectively show the horizontal center section and the vertical center section of the light illuminance ratio distribution diagram. In the comparative example shown in the figure, the light intensity loss during light distribution (diffusion) becomes too large and the average illuminance level is greatly reduced. Further, light distribution unevenness occurs remarkably, and the diffusive effect of the optical action plate 200 diffuses much of the light reaching the central portion, so that the illuminance at the central portion becomes extremely low.

以上の実施形態では、光学作用板の配光変更構造を拡散面とした場合を例示して説明したが、光学作用板の配光変更構造を集光面とする態様も可能であり、光学作用板の配光変更構造の機能には自由度がある。 In the above embodiment, the case where the light distribution change structure of the optical action plate is a diffusion surface has been described as an example. However, an aspect in which the light distribution change structure of the optical action plate is a light collection surface is also possible. There is a degree of freedom in the function of the light distribution changing structure of the plate.

１０フラッシュ装置
１００発光部
１１０光源
１２０リフレクタ
１３０仲介光学作用板（仲介配光作用板、第１の配光作用板）
１３５フレネル面（フレネル形状）
２００光学作用板（配光作用板、配光装置、第２の配光作用板）
２０５ヒンジ軸
２１０２１０Ａ２１０Ｂ２１０Ｃ２１０Ｃ１２１０Ｃ２２１０Ｄ２１０Ｅ２１０Ｅ１２１０Ｅ２配光変更構造（拡散面） DESCRIPTION OF SYMBOLS 10 Flash apparatus 100 Light emission part 110 Light source 120 Reflector 130 Mediation optical action board (Mediation light distribution action board, 1st light distribution action board)
135 Fresnel surface (Fresnel shape)
200 Optical action plate (light distribution action plate, light distribution device, second light distribution action plate)
205 Hinge shaft 210 210A 210B 210C 210C1 210C2 210D 210E 210E1 210E2 Light distribution changing structure (diffusion surface)

Claims

A light distribution device including an optical action plate for distributing light from a light emitting unit arranged along a predetermined axial direction to a predetermined range,
The optical action plate has a light distribution changing structure for changing the light distribution of the light from the light emitting section;
The light distribution changing structure of the optical action plate is provided in a portion outside the effective light emission length of the light emitting unit along the predetermined axial direction; and Disposed only in a part of the inside of the effective optical range of the optical action plate with respect to a direction perpendicular to the predetermined axial direction;
A light distribution device characterized by the above.

The light distribution device according to claim 1.
The light distribution changing structure of the optical action plate is disposed only in a part of the effective optical range along the predetermined axial direction.

The light distribution device according to claim 1 or 2,
The light distribution changing structure of the optical action plate is a light distribution device provided on only one of the light incident surface and the light emission surface of the optical action plate.

The light distribution device according to claim 3.
The light distribution device, wherein a surface of the optical action plate on which the light distribution change structure is not provided has an axisymmetric shape with respect to an axis parallel to the predetermined axial direction.

The light distribution device according to any one of claims 1 to 4,
The light distribution device in which an outer portion in the vertical direction other than the light distribution changing structure of the optical action plate has an axisymmetric shape with respect to an axis parallel to the predetermined axial direction.

The light distribution device according to claim 5.
The light distribution device, wherein an outer portion in the vertical direction other than the light distribution changing structure of the optical action plate is an inclined surface that is axisymmetric with respect to an axis parallel to the predetermined axial direction.

The light distribution device according to claim 5.
The light distribution device in which an outer portion in the vertical direction other than the light distribution changing structure of the optical action plate is a curved surface that is axisymmetric with respect to an axis parallel to the predetermined axial direction.

The light distribution device according to any one of claims 1 to 7,
The light distribution changing structure of the optical action plate comprises a diffusion surface for diffusing light from the light emitting portion, and the diffusion surface has different diffusion powers at the central portion and the peripheral portion of the optical action plate. Optical device.

The light distribution device according to claim 8.
The light distribution device in which the diffusing surface has a diffusing force on a peripheral side that is stronger than a central side of the optical action plate when viewed along the predetermined axial direction.

The light distribution device according to claim 8 or 9,
The light diffusing surface is a light distribution device including a plurality of depressions or protrusions having a quadrangular pyramid shape.

The light distribution device according to any one of claims 1 to 10,
The optical distribution plate is a light distribution device that can be inserted and removed from an optical path of light from the light emitting unit.

A flash device comprising the light distribution device according to claim 1.

A light emitting section extending in a predetermined axial direction, a reflector for reflecting light from the light emitting section, an intermediate light distribution action plate having a Fresnel shape on at least one surface, and light emitted from the intermediate light distribution action plate A flash device including an optical action plate for distributing light within a predetermined range,
The optical action plate has a light distribution changing structure for changing the light distribution of the light from the light emitting unit; and the light distribution changing structure of the optical action plate is perpendicular to the predetermined axis. It is arranged only in a range of a part inside the effective optical range of the optical action plate with respect to the direction;
Flash device characterized by.