JPH0228845B2 - SUPETSUKURUKAKUSANBANSAKUSEISOCHI - Google Patents
SUPETSUKURUKAKUSANBANSAKUSEISOCHIInfo
- Publication number
- JPH0228845B2 JPH0228845B2 JP15301487A JP15301487A JPH0228845B2 JP H0228845 B2 JPH0228845 B2 JP H0228845B2 JP 15301487 A JP15301487 A JP 15301487A JP 15301487 A JP15301487 A JP 15301487A JP H0228845 B2 JPH0228845 B2 JP H0228845B2
- Authority
- JP
- Japan
- Prior art keywords
- diffuser plate
- speckle
- light
- plate
- size
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 16
- 230000001427 coherent effect Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 238000004061 bleaching Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000005337 ground glass Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Landscapes
- Viewfinders (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【発明の詳細な説明】
〔技術分野〕
本発明はスペツクル拡散板作成装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an apparatus for producing a speckle diffuser plate.
スペツクル拡散板とはコヒーレント光束で照明
されたスリガラス等の第１の拡散板からの拡散光
束中に生じたスペツクルパターンを記録し得られ
た第２の拡散板である。
A speckle diffuser is a second diffuser plate obtained by recording a speckle pattern generated in a diffused light beam from a first diffuser plate such as ground glass illuminated with a coherent light beam.
そして、このスペツクル拡散板及びその製造方
法は従来から知られている。 This speckle diffuser plate and its manufacturing method are conventionally known.
しかしながら、従来の製造方法によるスペツク
ル拡散板は、スペツクルパターンのサイズが不均
一であり、又、回転対称な拡散特性をもつスペツ
クル拡散板を作成することも困難であつた。 However, speckle diffusers manufactured using conventional methods have non-uniform speckle patterns, and it is also difficult to produce speckle diffusers with rotationally symmetrical diffusion characteristics.
本発明の目的は、サイズがそろつたスペツクル
パターンを記録したスペツクル拡散板が作成可能
で、且つ回転対称な拡散特性を有する拡散板が作
成可能な、スペツクル拡散板作成装置を提供する
ことにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a speckle diffuser plate creation device that can create a speckle diffuser plate that records speckle patterns of uniform size and that can also create a diffuser plate that has rotationally symmetrical diffusion characteristics. .
上記目的を達成する為に、本発明に係るスペツ
クル拡散板作成装置は、第１の拡散板を照明する
コヒーレント光束中又はコヒーレント光束によつ
て照明された第１の拡散板からの拡散光束中に光
透過領域を有する遮光板を設け得られたスペツク
ルパターンを光感材上に記録し第２の拡散板とし
てスペツクル拡散板を得るスペツクル拡散板作成
装置に於いて、前記遮光板は、前記光透過領域と
して輪帯状開口を有するものであり、該輪帯状開
口に内接する円の直径をｄ、該輪帯状開口に内接
する円の内の最も離れた内接円同志の中心間距離
をＤとする時、１＜Ｄ／ｄ４なる関係を有する
ことを特徴としている。 In order to achieve the above object, the speckle diffuser plate producing apparatus according to the present invention provides a method for producing a speckle diffuser plate in a coherent light beam illuminating a first diffuser plate or in a diffuse light beam from a first diffuser plate illuminated by a coherent light beam. In a speckle diffuser plate producing apparatus that includes a light shielding plate having a light transmitting area and records the obtained speckle pattern on a photosensitive material to obtain a speckle diffuser plate as a second diffuser plate, the light shielding plate has a light transmitting area. It has an annular opening as a transmission area, and the diameter of the circle inscribed in the annular opening is d, and the distance between the centers of the furthest inscribed circles among the circles inscribed in the annular opening is D. It is characterized by having the relationship 1<D/d4.
以下添付図面を使用して本発明を説明する。 The present invention will be explained below using the accompanying drawings.
第１図は１眼レフレツクスカメラのピント板と
して使用されていた拡散板の断面図を示すもの
で、これら従来のピント板は通常機械的方法、す
なわちガラス板を荒摺りする方法、又は荒摺りさ
れた金属面の凹凸をプラスチツク板に転写する方
法等によつて作成されている。このため、これら
の拡散板は第１図に示すように凹凸の大きさにバ
ラツキが有り、又、凹凸の断面形状が非常に鋭い
角を有するため、拡散角度特性は第２図の１の如
くなる。すなわち、０度近辺で非常に高い拡散
光／入射光率を示し、角度が5゜近辺まで急速に拡
散光／入射効率が低下している。さらに角度が大
きくなつた領域では、絶対量は少ないものの、か
なり拡散光が残存する。これらの残存光は拡散板
の通常の使用法、たとえば、画像を投影するスク
リーンとしての使用法等においては、全く不必要
な光であり、光量ロスとなる。 Figure 1 shows a cross-sectional view of a diffuser plate used as a focusing plate in a single-lens reflex camera. It is created by a method such as transferring the unevenness of a rubbed metal surface onto a plastic plate. For this reason, these diffusion plates have unevenness in the size of the unevenness as shown in Figure 1, and the cross-sectional shape of the unevenness has very sharp angles, so the diffusion angle characteristics are as shown in Figure 2. Become. That is, the diffused light/incident light efficiency is extremely high near 0 degrees, and the diffused light/incident efficiency rapidly decreases as the angle approaches 5 degrees. In areas where the angle is further increased, a significant amount of diffused light remains, although the absolute amount is small. These residual lights are completely unnecessary light in the normal use of the diffuser plate, for example, in the use as a screen for projecting an image, and result in a loss in the amount of light.
これに対して、本発明の装置で実際に作成され
たスペツクル拡散板の拡散角度特性は第２図の点
線２で示すように中心から必要とする角度、即ち
5゜〜10゜付近まで拡散光が線形的に減少するか、
あるいは同図の破線３で示すようにある角度内に
殆んどの拡散光を集中するか、あるいは一点鎖線
４で示すように拡散特性を示すカーブの全体的形
状は従来のもの、実線１と余り変わらないが、す
その部分の拡散光を少なくすることによつて、中
央，中間部分の光量を上げたものとなる。本発明
の装置を用いて得られた拡散板の、従来の拡散板
に対して、共通に有する特性は、第２図の２に見
る如く角度の大きい拡散光が15゜付近で従来品の
ほぼ半分程度に低下し（第２図２には示されてい
ないが、20゜付近では従来品においては拡散光が
残存するのに対し、本発明によつて得られた拡散
板では殆んど０となる。）低下した分だけ逆に角
度の小さい領域での拡散光が増加している点にあ
る。そして、本発明の装置によつて作成されたス
ペツクル拡散板の好ましい例は第３図にその断面
を示した如くほぼ大きさδのそろつた、滑らかな
微小レンズが密に配列された構造のものである。
このような構成で、第２図の点線で示した特性を
得るには各微小レンズの高さｈがほぼ一定とする
と、レンズの直径δをある程度バラツかせ（微小
レンズ間のパワーをバラツかせ）ることによつて
得られ、又第２図の破線３の如き特性を得るには
微小レンズの直径δをそろえる（微小レンズ間の
パワーをそろえる）ことが望ましい。 On the other hand, the diffusion angle characteristic of the speckle diffuser actually created using the apparatus of the present invention is the required angle from the center as shown by the dotted line 2 in FIG.
The diffused light decreases linearly from around 5° to 10°, or
Or, as shown by the broken line 3 in the figure, most of the diffused light is concentrated within a certain angle, or the overall shape of the curve showing the diffusion characteristics is the conventional one, as shown by the dashed line 4, and the remainder is the same as the solid line 1. However, by reducing the amount of diffused light at the base, the amount of light at the center and middle areas is increased. The characteristic that the diffuser plate obtained using the device of the present invention has in common with the conventional diffuser plate is that, as shown in 2 in Fig. 2, the diffused light at a large angle is around 15 degrees, which is almost the same as that of the conventional product. (Although it is not shown in Figure 2, in the conventional product, diffused light remains at around 20 degrees, whereas in the diffuser plate obtained by the present invention, it is almost 0. ) The difference is that the amount of diffused light in the region with a small angle increases to compensate for the decrease. A preferable example of a speckle diffuser produced by the apparatus of the present invention has a structure in which smooth microlenses of approximately uniform size δ are densely arranged, as shown in the cross section of FIG. It is.
With such a configuration, in order to obtain the characteristics shown by the dotted line in Figure 2, if the height h of each microlens is approximately constant, the diameter δ of the lens should be varied to some extent (the power between the microlenses should be varied). In addition, in order to obtain the characteristics shown by the broken line 3 in FIG. 2, it is desirable to make the diameters δ of the microlenses the same (to make the powers between the microlenses the same).
この微小レンズの直径δはスペツクル拡散板を
作成する際に感光材上に形成されるスペツクルの
大きさに密接に関連する。従つて、上述の如き特
性のスペツクル拡散板はスペツクル拡散板を作成
する際に感光材上に形成されるスペツクルの大き
さを制御することによつて得られる。以下、スペ
ツクル拡散板を作成する際に感光材上に形成され
るスペツクルの大きさの制御法について第４図を
使用して説明する。 The diameter δ of this microlens is closely related to the size of speckles formed on the photosensitive material when producing the speckle diffuser plate. Therefore, a speckle diffuser plate having the characteristics described above can be obtained by controlling the size of speckles formed on a photosensitive material when producing the speckle diffuser plate. Hereinafter, a method for controlling the size of speckles formed on a photosensitive material when producing a speckle diffuser plate will be explained using FIG. 4.
４はコヒーレント光束５によつて照明されてい
る拡散板である、この拡散板４を２つの開口７，
８を有する遮光板６を介してレンズ９によつて感
光板１０上に投影する。この際感光板１０上に生
ずるパターンは第５図に示すようにスペツクルパ
ターンの中に干渉縞が重なつたものでスペツクル
パターンの平均的大きさδは第４図に於いて遮光
板上の開口の直径をｄ、レンズ９と感光材１０と
の距離をｑ、コヒーレントな光束の波長をλとし
てほぼ
δ＝λq／ｄ (1)
で与えられる。 4 is a diffuser plate illuminated by a coherent light beam 5. This diffuser plate 4 is connected to two apertures 7,
The image is projected onto a photosensitive plate 10 by a lens 9 through a light shielding plate 6 having a light shielding plate 8 . At this time, the pattern generated on the photosensitive plate 10 is a speckle pattern overlapping interference fringes as shown in FIG. 5, and the average size δ of the speckle pattern is as shown in FIG. It is approximately given by δ=λq/d (1) where d is the diameter of the aperture, q is the distance between the lens 9 and the photosensitive material 10, and λ is the wavelength of the coherent light beam.
このスペツクルパターンは第５図に示すように
ピツチＰなる干渉縞によつて分断されている。そ
してこのピツチＰは第４図に於いて二つの開口
７，８を通過した２本の光線１１1，１１2の交切
角の半分をαとして
ｐ＝λ／（2sinα） (2)
で与えられる。従つて、分断されたスペツクルの
大きさは２本の光線１１1，１１2の交切角度、す
なわち２つの開口７，８の間隔Ｄによつて決定さ
れる。第２図グラフ２〜４に示した如き良好な特
性を有する拡散板を得ようとした場合、個々の開
口の大きさによつて決まるスペツクルの平均的な
大きさと、異なつた開口を通過した光束同志の干
渉によつて分断されたスペツクルの大きさ（すな
わちピツチ）との比はある一定の範囲内におくべ
きことが本件発明者の実験によつて解つた。スペ
ツクルの大きさに対し干渉縞のピツチを余り小さ
く、細かく分断し過ぎると良好な拡散板が得られ
なかつた。一般に、空間中に生ずるスペツクルパ
ターンと、それを記録して得られる拡散板の拡散
特性とは、一意的な結びつきはなく、感材の記録
特性によつて大きく変化する。従つて、スペツク
ルの強度分布だけを見て、最終的に得られる拡散
板の特性をうんぬんすることはできない。ただ
し、われわれの用いた記録法、即ち銀塩ブリーチ
法とか、フオトレジストへの記録とか、表面の凹
凸としてスペツクルを記録する場合においては、
δとＰの比δ／Ｐを余り大きくしない方が良い結
果が得られた。これは、大ざつぱにいつてスペツ
クルの大きさに対し、干渉縞を余り細かくする
と、第５図に示したように、スペツクルの存在す
る部分には、干渉効果が現れるが、スペツクルの
存在しない部分には干渉縞がのらず（干渉縞が現
れるとしても暗い干渉縞である）、全体的に粒状
性を均一にする効果がうすれるためと思われる。
スペツクルの大きさδと分断されたスペツクルの
比、すなわち、干渉縞のピツチＰとの比は次の様
に与えられる。 This speckle pattern is divided by interference fringes of pitch P, as shown in FIG. This pitch P is given by p=λ/(2sinα) (2) where α is half of the intersection angle of the two rays 11 1 and 11 2 that passed through the two apertures 7 and 8 in Figure 4. It will be done. Therefore, the size of the divided speckle is determined by the intersection angle of the two light rays 11 1 and 11 2 , that is, the distance D between the two apertures 7 and 8. When trying to obtain a diffuser plate with good characteristics as shown in graphs 2 to 4 in Figure 2, the average size of the speckle determined by the size of each aperture and the light flux passing through different apertures The inventor's experiments have revealed that the ratio of the size of speckles (ie, pitch) divided by the interference of comrades should be within a certain range. If the pitch of the interference fringes is too small relative to the size of the speckles and the interference fringes are divided too finely, a good diffusion plate cannot be obtained. In general, there is no unique relationship between the speckle pattern generated in space and the diffusion characteristics of the diffuser plate obtained by recording it, and they vary greatly depending on the recording characteristics of the photosensitive material. Therefore, it is not possible to determine the characteristics of the final diffuser plate by looking only at the speckle intensity distribution. However, in the recording methods we used, such as silver salt bleaching, recording on photoresist, and recording speckles as irregularities on the surface,
Better results were obtained by not increasing the ratio δ/P too much. This is because if the interference fringes are made too fine compared to the size of the speckle, as shown in Figure 5, an interference effect will appear in the part where the speckle exists, but in the part where there is no speckle. This seems to be because no interference fringes appear (even if interference fringes do appear, they are dark interference fringes), and the effect of making the graininess uniform as a whole is diminished.
The ratio between the size δ of the speckle and the divided speckle, that is, the pitch P of the interference fringe, is given as follows.
第(2)式で示された角度αが小さい時
sinαＤ／（2q） (3)
であるから、スペツクルの平均的な大きさδと干
渉縞のピツチＰとの比は(1)，(2)式より、
δ／ｐＤ／ｄ
となる。すなわち、スペツクルの大きさと分断さ
れたスペツクルの大きさの比は開口の大きさｄと
２開口間の距離Ｄによつて与えられる。この為、
本件発明者等は種々の遮光板、すなわち、Ｄ，ｄ
が異なる遮光板を使用して第４図の配置で実験し
た処、１＜Ｄ／ｄ４である輪帯開口を備えた遮
光板を使用した場合、微小レンズの大きさのそろ
つた、且つ又拡散特性が回転対称な拡散板が得ら
れた。特にＤ／ｄ２〜３の遮光板を使用した場
合もつとも良い結果が得られた。 When the angle α shown in equation (2) is small, sinαD/(2q) (3), so the ratio between the average size δ of the speckle and the pitch P of the interference fringes is (1), (2 ), it becomes δ/pD/d. That is, the ratio of the size of the speckle to the size of the divided speckle is given by the size d of the aperture and the distance D between the two apertures. For this reason,
The inventors have developed various light shielding plates, namely D, d
We conducted an experiment with the arrangement shown in Figure 4 using light-shielding plates with different values, and found that when we used a light-shielding plate with an annular aperture where 1<D/d4, the size of the microlenses were uniform and the diffusion A diffuser plate with rotationally symmetrical characteristics was obtained. Particularly good results were obtained when a light shielding plate with D/d of 2 to 3 was used.
以下本発明の一実施例の光学配置を第６図を使
用して説明する。 The optical arrangement of one embodiment of the present invention will be explained below using FIG. 6.
１２はレーザー光源、例えばHe―Neレーザ
ー，Arイオンレーザー，Krイオンレーザー等か
らのコヒーレントな光束、１３は第１の透過型又
は反射型の拡散板１４を照明する時に望ましくは
結像レンズ１５の中心に収束させるような光束を
得るための照明用レンズ、１６は輪帯状の開口部
を有する遮光領域の存在する遮光板である。 12 is a coherent light beam from a laser light source, for example, a He--Ne laser, an Ar ion laser, a Kr ion laser, etc.; 13 is a coherent beam of light from an imaging lens 15, which is preferably used when illuminating the first transmission type or reflection type diffuser plate 14; An illumination lens 16 is used to obtain a light beam converged at the center, and 16 is a light-shielding plate having a light-shielding region having an annular opening.
ここで、遮光板１６の開口部は第７図に示す様
な形状を備えている。第７図に示される輪帯開口
２４に於いて、ｄは輪帯開口２４の縁に接する小
円（内接円）２５，２６の直径、Ｄはこの小円２
５，２６の円の中心間の距離である。 Here, the opening of the light shielding plate 16 has a shape as shown in FIG. In the orbicular opening 24 shown in FIG. 7, d is the diameter of small circles (inscribed circles) 25 and 26 that touch the edge of the orbicular opening 24, and D is the diameter of this small circle 2.
This is the distance between the centers of circles 5 and 26.
本実施例では上記小円２５，２６の直径ｄと上
記小円２５，２６間の距離Ｄとの比を
１＜Ｄ／ｄ４
なる関係にしている。 In this embodiment, the ratio between the diameter d of the small circles 25 and 26 and the distance D between the small circles 25 and 26 is set to the following relationship: 1<D/d4.
再び、第６図に戻つて、１７は拡散板１４の結
像レンズ１５による像、１８はスペツクルパター
ン記録用感光材である、このスペツクルパターン
記録用感光材１８上には第(1)式で求められる平均
的大きさδなるスペツクルパターンに第(2)式で求
められるピツチＰなる干渉縞が重ね合わさつたパ
ターンが形成される。 Returning again to FIG. 6, 17 is an image formed by the imaging lens 15 of the diffuser plate 14, and 18 is a speckle pattern recording photosensitive material. A pattern is formed in which interference fringes with a pitch P obtained by equation (2) are superimposed on a speckle pattern with an average size δ obtained by the equation (2).
この様な分断されたスペツクルパターンが記録
された感光材１８を処理することによつて均一な
サイズをもつスペツクルパターンと多方向に沿つ
て干渉縞が形成された拡散板が得られた。尚、感
光材の処理はその感光材の種類によつて処理が異
なる。すなわち、感光材が銀塩フイルムの際はよ
く知られた各種の、ブリーチ処理が採用され、ホ
トレジの場合はレジストにマツチした現像液処理
法を用いて、望ましい拡散板を得る。 By processing the photosensitive material 18 on which such a divided speckle pattern was recorded, a diffuser plate was obtained in which a speckle pattern having a uniform size and interference fringes were formed along multiple directions. Note that the processing of the photosensitive material differs depending on the type of the photosensitive material. That is, when the photosensitive material is a silver salt film, various well-known bleaching treatments are employed, and when photoresist is used, a developer processing method that matches the resist is used to obtain a desirable diffusion plate.
第８図，第９図は第６図と異なる光学配置を示
すもので第８図中レーザー光源からの光束２７は
コンデンサーレンズ２８、開口２９を通して拡散
板３０を照明する。コンデンサーレンズ２８から
の出射光の収束位置は感光材面上でスペツクルの
強度分布が一様である限り余り問題ではない。
又、第９図のように開口２９と拡散板３０を入れ
換えても良い。 8 and 9 show an optical arrangement different from that in FIG. 6. In FIG. 8, a light beam 27 from a laser light source illuminates a diffuser plate 30 through a condenser lens 28 and an aperture 29. The convergence position of the light emitted from the condenser lens 28 does not matter much as long as the speckle intensity distribution is uniform on the surface of the photosensitive material.
Alternatively, the opening 29 and the diffusion plate 30 may be replaced as shown in FIG.
尚、第７図には完全な輪帯開口が示されている
がこの開口部が多少変形したもの例えば１部が切
り欠けているものでも良い。 Although a complete annular opening is shown in FIG. 7, this opening may be slightly deformed, for example, a portion may be cut away.
以上のように、遮光板の光透過領域を輪帯開口
で形成し、輪帯開口に内接する円の直径をｄ，輪
帯開口に内接する円の内の最も離れた内接円同志
の円中心間距離をＤとすると、Ｄ／ｄが１より
大、４以下、好ましくは２〜３の間であつた際、
スペツクルパターンのサイズが均一で、回転対称
な拡散特性を有する良好な拡散板が得られる。
尚、第４図の装置によつて、感光材として銀塩フ
イルムを使用した際、ブリーチを行つた後、粒子
サイズ10μ，5μ，3μ程度のものなど各種の拡散板
が得られた。また山の高さは0.5〜1.0μ程度で、
これを１眼レフレツクスカメラのピント板として
使用した際、明るく（結像レンズのＦNo.にもよる
が、従来のマツト面に比較し３割から５割程度明
るさが増大する）、又、絞りを絞り込んでも周辺
光量の低下の少ないフアインダー像が得られた。
以上の説明では、作成されたスペツクル拡散板は
透過型であることを前提として行つたが、スペツ
クル拡散板上に金属を蒸着して反射型スペツクル
拡散板にしても良い。 As described above, the light transmission area of the light shielding plate is formed by the annular opening, the diameter of the circle inscribed in the annular opening is d, and the circle of the furthest inscribed circle among the circles inscribed in the annular opening is When the distance between centers is D, when D/d is greater than 1 and less than 4, preferably between 2 and 3,
A good diffusion plate having a uniform speckle pattern size and rotationally symmetrical diffusion characteristics can be obtained.
By the way, when a silver salt film was used as a photosensitive material using the apparatus shown in FIG. 4, after bleaching, various types of diffusion plates such as those having particle sizes of about 10 μm, 5 μm, and 3 μm were obtained. Also, the height of the mountain is about 0.5 to 1.0μ,
When this is used as a focusing plate for a single-lens reflex camera, it is bright (depending on the F No. of the imaging lens, the brightness increases by about 30% to 50% compared to a conventional matte surface), and Even when the aperture was stopped down, a finder image with little decrease in peripheral light intensity was obtained.
Although the above description has been made on the premise that the produced speckle diffuser plate is of a transmission type, a reflective speckle diffuser plate may be made by vapor depositing metal on the speckle diffuser plate.
以上、本発明によれば、第１の拡散板を照明す
るコヒーレント光束中又はコヒーレント光束によ
つて照明された第１の拡散板からの光束中に設け
られ、スペツクルパターンを記録される光感材上
に到達する拡散光束を制御する為の遮光板とし
て、輪帯状開口から成る光透過領域を備え、且つ
先に説明した如き１＜Ｄ／ｄ４なる開口形状を
輪帯状開口に与えることにより、サイズがそろつ
たスペツクルパターンを記録した拡散板を得るこ
とが可能で、且つ回転対称な拡散特性を有する拡
散板を作成出来るスペツクル拡散板作成装置が得
られる。
As described above, according to the present invention, the light sensor is provided in the coherent light flux illuminating the first diffuser plate or in the light flux from the first diffuser plate illuminated by the coherent light flux, and the speckle pattern is recorded. By providing a light transmission area consisting of annular openings as a light shielding plate for controlling the diffused light flux reaching the material, and by giving the annular openings an aperture shape of 1<D/d4 as described above, It is possible to obtain a speckle diffuser plate producing apparatus which can obtain a diffuser plate recording a speckle pattern of uniform size and which can produce a diffuser plate having rotationally symmetrical diffusion characteristics.
第１図は従来のスリガラス等の拡散板の断面
図、第２図は従来の拡散板、及び本発明の装置に
よつて作成された拡散板の配光特性図、第３図は
本発明の装置によつて作成された拡散板の断面
図、第４図は、スペツクルパターンの大きさ、干
渉縞のピツチ間隔を説明するための図、第５図は
第４図の光学配置によつて形成されるスペツクル
パターンを示す図、第６図は本発明の装置の実施
例を示す図、第７図は第６図に示された遮光板を
説明する図、第８図，第９図は第６図と構成が異
なる実施例を示す図。
１２はコヒーレントな光束、１３は照明用レン
ズ、１４は第１の拡散板、１５は結像レンズ、１
６は遮光板、１７は第１の拡散板の像、１８は感
光材である。
FIG. 1 is a cross-sectional view of a conventional diffuser plate made of ground glass, etc., FIG. 2 is a light distribution characteristic diagram of a conventional diffuser plate and a diffuser plate produced by the apparatus of the present invention, and FIG. FIG. 4 is a cross-sectional view of the diffuser plate created by the apparatus, and FIG. 5 is a diagram for explaining the size of the speckle pattern and the pitch interval of interference fringes. FIG. FIG. 6 is a diagram showing an embodiment of the apparatus of the present invention; FIG. 7 is a diagram explaining the light shielding plate shown in FIG. 6; FIGS. 8 and 9 6 is a diagram showing an embodiment different in configuration from FIG. 6. FIG. 12 is a coherent light beam, 13 is an illumination lens, 14 is a first diffuser plate, 15 is an imaging lens, 1
6 is a light shielding plate, 17 is an image of the first diffusion plate, and 18 is a photosensitive material.
Claims (1)
又はコヒーレント光束によつて照明された第１の
拡散板からの拡散光束中に光透過領域を有する遮
光板を設け得られたスペツクルパターンを光感材
上に記録し第２の拡散板としてスペツクル拡散板
を得るスペツクル拡散板作成装置に於いて、前記
遮光板は、前記光透過領域として輪帯状開口を有
するものであり、該輪帯状開口に内接する円の直
径をｄ、該輪帯状開口に内接する円の内の最も離
れた内接円同志の中心間距離をＤとする時、１＜
Ｄ／ｄ４なる関係を有することを特徴とするス
ペツクル拡散板作成装置。1. A light shielding plate having a light transmitting area is provided in the coherent light beam illuminating the first diffuser plate or in the diffused light beam from the first diffuser plate illuminated by the coherent light beam, and the resulting speckle pattern is exposed to light. In the speckle diffuser plate producing apparatus for recording on a material and obtaining a speckle diffuser plate as a second diffuser plate, the light shielding plate has an annular opening as the light transmission area, and the light shielding plate has an annular opening as the light transmitting area. When the diameter of the contacting circle is d, and the distance between the centers of the furthest inscribed circles among the circles inscribed in the annular opening is D, 1<
A speckle diffuser plate producing device characterized by having a relationship of D/d4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15301487A JPH0228845B2 (en) | 1987-06-19 | 1987-06-19 | SUPETSUKURUKAKUSANBANSAKUSEISOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15301487A JPH0228845B2 (en) | 1987-06-19 | 1987-06-19 | SUPETSUKURUKAKUSANBANSAKUSEISOCHI |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12652076A Division JPS5351755A (en) | 1976-10-21 | 1976-10-21 | Preparing apparatus for speckle diffusion plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6371803A JPS6371803A (en) | 1988-04-01 |
| JPH0228845B2 true JPH0228845B2 (en) | 1990-06-26 |
Family
ID=15553072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15301487A Expired - Lifetime JPH0228845B2 (en) | 1987-06-19 | 1987-06-19 | SUPETSUKURUKAKUSANBANSAKUSEISOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0228845B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2677136B1 (en) * | 1991-05-30 | 1994-07-08 | Sextant Avionique | LIGHT DIFFUSER AND MANUFACTURING METHOD THEREOF. |
| CA2168107C (en) * | 1993-07-27 | 2001-02-13 | Joel Petersen | Light source destructuring and shaping device |
| US6258443B1 (en) * | 1994-09-28 | 2001-07-10 | Reflexite Corporation | Textured retroreflective prism structures and molds for forming same |
| JP5097153B2 (en) * | 2009-03-09 | 2012-12-12 | 旭化成株式会社 | Diffusion sheet |
| JP5526370B2 (en) * | 2009-11-02 | 2014-06-18 | レーザーテック株式会社 | Illumination optical system, illumination method, and inspection apparatus |
-
1987
- 1987-06-19 JP JP15301487A patent/JPH0228845B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6371803A (en) | 1988-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4336978A (en) | Method for optically making a diffusion plate | |
| US4523807A (en) | Method for making a member having microstructure elements arranged thereon | |
| US4427265A (en) | Diffusion plate | |
| US4421398A (en) | Focussing plate | |
| JP3413519B2 (en) | Light homogenizing apparatus and manufacturing method thereof | |
| US5889612A (en) | Rear pojection screen | |
| JP3553929B2 (en) | Method for producing light diffusing material | |
| DK167782B1 (en) | REAR PROJECTION SCREEN AND PROCEDURE FOR PREPARING THE SAME | |
| US5085977A (en) | Focusing screen and a method of forming a microstructure array for use with a focusing screen | |
| US4309093A (en) | Camera having a diffusing plate with rotationally asymmetric light diffusion property | |
| US20020034012A1 (en) | Light control devices and methods implemented with kinoform diffusers having controllable diffusion characteristics | |
| US3988066A (en) | Light exposure apparatus for printing | |
| KR100448606B1 (en) | Manufacturing method of light diffusing screen | |
| JPS63761B2 (en) | ||
| JP2001074918A (en) | Light diffusing body and its production | |
| JPH0228845B2 (en) | SUPETSUKURUKAKUSANBANSAKUSEISOCHI | |
| US5386266A (en) | Projection exposure system | |
| JPS59131902A (en) | Forming method of speckle diffusion plate | |
| US3811770A (en) | Camera | |
| JP3280275B2 (en) | Method of manufacturing projection screen | |
| JPH0228844B2 (en) | KAKUSANBAN | |
| JP2914035B2 (en) | Ring light flux forming method and illumination optical device | |
| JPS6318174B2 (en) | ||
| JP3346629B2 (en) | Manufacturing method of reticle and reticle forming mold | |
| US6903851B2 (en) | Method for producing light scattering elements |