JPH0293401A - Fresnel lens sheet - Google Patents

Fresnel lens sheet

Info

Publication number
JPH0293401A
JPH0293401A JP63245428A JP24542888A JPH0293401A JP H0293401 A JPH0293401 A JP H0293401A JP 63245428 A JP63245428 A JP 63245428A JP 24542888 A JP24542888 A JP 24542888A JP H0293401 A JPH0293401 A JP H0293401A
Authority
JP
Japan
Prior art keywords
lens
curved surface
lens sheet
fresnel lens
sheet
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.)
Granted
Application number
JP63245428A
Other languages
Japanese (ja)
Other versions
JP2895070B2 (en
Inventor
Hiroshi Sekiguchi
博 関口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP63245428A priority Critical patent/JP2895070B2/en
Publication of JPH0293401A publication Critical patent/JPH0293401A/en
Application granted granted Critical
Publication of JP2895070B2 publication Critical patent/JP2895070B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Overhead Projectors And Projection Screens (AREA)

Abstract

PURPOSE:To obtain a satisfactory picture quality by constituting a part of the lens surface of each lens unit of a Fresnel lens sheet of a curved surface or plural planes of an approximate curved surface. CONSTITUTION:By providing a curved surface part 4 on the lens surface, light beams emitted from the curved surface pat 4 are diffused, and an area 5 which the light beam does not transmit through becomes smaller than the case in which the lens surface is constituted of only a plane. Accordingly, intensity of a moire can be weakened. Also, a shape of the curved surface part 4 of the lens surface is formed so that the light beam is diffused without excess or shortage to the area which a projection light does not transmit through and becomes dark. By constituting a Fresnel lens sheet 7 in such a way and constituting a transmission type projection screen by combining it with a lenticular lens sheet 8, intensity of a generated moire pattern is reduced effectively and a satisfactory picture quality can be obtained.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明はレンズンート、特にレンチキュラーレンズシー
トと組み合わせて透過型投影スクリーンを構成するフレ
ネルレンズシートに関する。
DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to lens lenses, in particular to Fresnel lens sheets which are used in combination with lenticular lens sheets to form transmission projection screens.

(従来の技術) 透過型投影スクリーンとしてフレネルレンズとレンチキ
ュラーレンズを組み合わせて構成したものが広く利用さ
れている。この構成においてフレネルレンズシートを配
置する方法にはフレネルレンズ面を投写光源側に向ける
場合と観察側に向ける場合の2種類の方法があるが、光
源光のフレネルレンズ周辺部における損失が少なくでき
ることからフレネルレンズ面を観察側に向けて配置する
方法が主流となっている。
(Prior Art) A transmissive projection screen constructed by combining a Fresnel lens and a lenticular lens is widely used. There are two ways to arrange the Fresnel lens sheet in this configuration: one in which the Fresnel lens surface faces the projection light source side, and one in which it faces the observation side. The mainstream method is to arrange the Fresnel lens surface facing the observation side.

(発明が解決しようとする課題) しかしながら、フレネルレンズ面を競察側に向けて配置
したフレネルレンズシートにレンチキュラーレンズシー
トを組み合わせた構成の透過型投影スクリーンでは、モ
ワレパターンが発生して著しく画像品質を劣化させてし
まうという問題点があった。
(Problem to be Solved by the Invention) However, in a transmission projection screen configured by combining a Fresnel lens sheet with a lenticular lens sheet arranged with the Fresnel lens surface facing the viewing side, a moire pattern occurs and the image quality is significantly deteriorated. There was a problem that it caused deterioration.

第3図は上記の構成の透過型投影スクリーンを用いた投
写系を示す図であり、7はフレネルレンズシート、8は
レンチキュラーレンズシート、9は投写光源である。第
4図は第3図のフレネルレンズシート7を透過する投写
光の光路を含む拡大断面図である。フレネルレンズシー
ト7を構成する単位レンズlはレンズ面2と非レンズ面
3から成り、レンズ面2は厳密には円誰の表面の一部で
あるが、局所的には平面と考えることができる。
FIG. 3 is a diagram showing a projection system using the transmission type projection screen having the above-mentioned configuration, in which 7 is a Fresnel lens sheet, 8 is a lenticular lens sheet, and 9 is a projection light source. FIG. 4 is an enlarged sectional view including the optical path of the projection light passing through the Fresnel lens sheet 7 of FIG. The unit lens l constituting the Fresnel lens sheet 7 consists of a lens surface 2 and a non-lens surface 3, and although the lens surface 2 is strictly a part of the surface of a circle, it can locally be considered a plane. .

このような平面のレンズ面を有する従来のフレネルレン
ズシートにおいて、投写光は矢印の付いた実線で示した
ような光路を描くが、斜線部5で示すような光の透過し
ない領域があり、この領域は暗くなる。フレネルレンズ
全体では同心円状にフレネルレンズのレンズ単位のピッ
チごとに暗くなる領域があり、この暗くなる領域がレン
チキュラーシート8を透して見ると、レンチキュラー1
こよりサンプリングされて見えるためモワレパターンと
して認識される。これがモワレの発生するメカニズムで
ある。
In a conventional Fresnel lens sheet having such a flat lens surface, the projected light traces an optical path as shown by the solid line with an arrow, but there is an area where the light does not pass, as shown by the shaded area 5. The area becomes darker. In the entire Fresnel lens, there is a concentrically darkened region at each pitch of the lens unit of the Fresnel lens, and when this darkened region is seen through the lenticular sheet 8, the lenticular 1
Since this pattern appears to be sampled, it is recognized as a moiré pattern. This is the mechanism by which moiré occurs.

本発明は上記の事情に鑑み、レンチキュラーシートと組
み合わせて透過型投影スクリーンとして使用した場合に
、モワレパターンの発生を低減した良好な画質の得られ
るフレネルレンズシートの提供を目的とする。
In view of the above circumstances, it is an object of the present invention to provide a Fresnel lens sheet that reduces the occurrence of moire patterns and provides good image quality when used as a transmission projection screen in combination with a lenticular sheet.

〔発明の構成〕[Structure of the invention]

(課題を解決するための手段) 上記目的を達成するため、本発明のフレネルレンズシー
トは、フレネルレンズシートの各レンズ単位のレンズ面
の一部が曲面または曲面に近似される複数の平面からな
るように構成したものである。
(Means for Solving the Problems) In order to achieve the above object, a Fresnel lens sheet of the present invention is provided, in which a part of the lens surface of each lens unit of the Fresnel lens sheet is composed of a curved surface or a plurality of planes approximated to a curved surface. It is configured as follows.

さらにレンズ面の曲面または曲面に近似される複数の平
面から構成する部分としては、とくにレンズ単位の谷部
に近い領域を選ぶことが存効である。
Furthermore, it is particularly effective to select a region close to the valley of the lens unit as the curved surface of the lens surface or a portion composed of a plurality of planes approximated to the curved surface.

なお、曲面化する形状を非レンズ面に対して角を持たな
い程度に円弧状にしてしまうと、画像の解像度の劣化等
を生じるので好ましくない。
Note that it is not preferable to make the shape of the curved surface into an arc shape that has no angle with respect to the non-lens surface, as this will cause deterioration of image resolution.

レンズ面の一部を曲面または曲面に近似される複数の平
面にする方法としては、 ■曲面あるいは曲面に近似される複数の平面を有するバ
イトを使用して切削した金型■平面のレンズ面を形成す
るようなバイトを使用して金型を作成した後、ブラスト
加工することにより金型の山部の形状を曲面化させて作
成した金型 ■バイトの角度を徐々に変化させながら金型の山部を切
削する方法で作成した金型 のいずれかを使用してフレネルレンズシートを成形する
方法を用いることができる。
As a method to make a part of the lens surface into a curved surface or multiple planes approximated to a curved surface, ■ a mold cut using a cutting tool having a curved surface or multiple planes approximated to a curved surface ■ a flat lens surface After creating a mold using a cutting tool, the shape of the peak of the mold is curved by blasting ■The mold is created by gradually changing the angle of the tooling tool. It is possible to use a method of molding a Fresnel lens sheet using any of the molds created by cutting the peaks.

(作用) 上記のように構成した本発明のフレネルレンズシートは
、各レンズ単位のレンズ面を曲面または曲面に近似され
る複数の平面をレンズ単位の谷部に近い領域に形成した
ことにより、投写光が透過せずに暗くなっていた領域に
光線を曲げて暗くなる領域を小さくすることができる。
(Function) The Fresnel lens sheet of the present invention configured as described above has a curved lens surface of each lens unit or a plurality of planes approximated to a curved surface formed in an area near the valley of the lens unit, so that projection is possible. It is possible to reduce the size of the darkened area by bending the light beam into the darkened area where no light is transmitted.

このことにより観察者に認識されるモワレパターンの強
度を著しく低減することができる。
This makes it possible to significantly reduce the intensity of the moire pattern perceived by the observer.

(実施例) 以下に実施例をあげて、更に具体的に本発明を説明する
(Example) The present invention will be described in more detail with reference to Examples below.

’11図は本発明のフレネルレンズシートの一実施例で
あるレンズ面をレンズ単位の谷の近くの領域で曲面にし
たフレネルレンズシートの投写光を含む拡大断面図であ
る。このようにレンズ面に曲面部4を設けることにより
、曲面部から出た光は拡散され、光の透過しない領域5
はレンズ面が平面のみで構成されている場合に比較して
小さくなる。従ってモワレの強度を弱くすることができ
る。ここでレンズ面の曲面部4の形状は投写光が透過せ
ず暗くなる領域5に光が過不足なく拡散するような形状
とすればよい。
FIG. 11 is an enlarged sectional view including projected light of a Fresnel lens sheet, which is an embodiment of the Fresnel lens sheet of the present invention, in which the lens surface is curved in a region near the valley of the lens unit. By providing the curved surface portion 4 on the lens surface in this way, the light emitted from the curved surface portion is diffused, and the light does not pass through the area 5.
is smaller than when the lens surface is made up of only flat surfaces. Therefore, the intensity of moiré can be weakened. Here, the shape of the curved surface portion 4 of the lens surface may be such that the projected light is not transmitted and the light is diffused in the dark area 5 in just the right amount.

第2図は本発明のフレネルレンズシートの第2の実施例
であるレンズ面をレンズ単位の谷の近くの領域で曲面に
近似される複数の平面で構成するようにしたフレネルレ
ンズシートの投写光を含む拡大断面図である。このよう
にレンズ面の一部に曲面に近似される複数の平面で構成
される領域6を設けることにより、投写光の透過しない
領域5は複数の領域に分割され、その各々の領域の大き
さは小さくなる。この各々の領域の大きさを人間の目で
識別できない程度に小さくすることにより、投写光が透
過しない領域により発生するモワレは見えなくすること
ができる。このようにレンズ面の一部に曲面に近似され
る複数の平面で構成される領域6を設けることでも、レ
ンズ面の一部を曲面にした場合と同様の効果を得ること
ができる。
FIG. 2 shows a second embodiment of the Fresnel lens sheet of the present invention, in which the lens surface is composed of a plurality of planes approximated to a curved surface in the area near the valley of the lens unit. FIG. In this way, by providing a region 6 consisting of a plurality of planes approximated to a curved surface in a part of the lens surface, the region 5 through which the projection light does not pass is divided into a plurality of regions, and the size of each region is becomes smaller. By making the size of each area so small that it cannot be discerned by the human eye, moire caused by areas through which the projection light does not pass can be made invisible. By providing a region 6 composed of a plurality of planes approximated to a curved surface on a part of the lens surface in this way, the same effect as when a part of the lens surface is made into a curved surface can be obtained.

〔発明の効果〕〔Effect of the invention〕

本発明のフレネルレンズシートは以上説明したように構
成されているので、レンチキュラーレンズシートと組み
合わせて透過型投影スクリーンを構成し使用する場合に
、発生するモワレパターンの強度を効果的に低減し良好
な画質を得ることができるという効果を有する。
Since the Fresnel lens sheet of the present invention is constructed as described above, when used in combination with a lenticular lens sheet to construct a transmission type projection screen, it can effectively reduce the intensity of the moire pattern that occurs and provide a good image. This has the effect that image quality can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明のフレネルレンズシートの一実施例を示
す拡大断面図、第2図は本発明の第2の実施例を示す拡
大断面図、第3図はフレネルレンズシートのレンズ面を
観察側に向けて配置しレンチキュラーシートと組み合わ
せて構成した投写系を示す図、第4図は従来のフレネル
レンズシートを示す拡大断面図である。 1 レンズ単位、2 レンズ面、3 非レンズ面、4 
曲面部、5 投写光の透過しない領域、6 曲面に近似
される複数の平面から構成される領域、7 フレネルレ
ンズシート、8レンチキユラーレンズシート、9 投写
光源。
Fig. 1 is an enlarged sectional view showing one embodiment of the Fresnel lens sheet of the present invention, Fig. 2 is an enlarged sectional view showing the second embodiment of the invention, and Fig. 3 is an observation of the lens surface of the Fresnel lens sheet. FIG. 4 is an enlarged sectional view showing a conventional Fresnel lens sheet. 1 lens unit, 2 lens surface, 3 non-lens surface, 4
Curved surface portion, 5 Area through which projection light does not pass, 6 Area composed of a plurality of planes approximated to a curved surface, 7 Fresnel lens sheet, 8 Lenticular lens sheet, 9 Projection light source.

Claims (1)

【特許請求の範囲】 1、レンチキュラーレンズシートと組み合わせて透過型
投影スクリーンを構成するフレネルレンズシートにおい
て、該フレネルレンズシートの各レンズ単位のレンズ面
の一部が曲面または曲面に近似される複数の平面から構
成されていることを特徴とするフレネルレンズシート。 2、レンズ面の曲面または曲面に近似される複数の平面
から構成される部分がレンズ単位の谷部に近い領域であ
ることを特徴とする請求項1記載のフレネルレンズシー
ト。
[Claims] 1. In a Fresnel lens sheet that constitutes a transmission projection screen in combination with a lenticular lens sheet, a portion of the lens surface of each lens unit of the Fresnel lens sheet is a curved surface or a plurality of lenses that are approximated to a curved surface. A Fresnel lens sheet characterized by being composed of a flat surface. 2. The Fresnel lens sheet according to claim 1, wherein the curved surface of the lens surface or the portion composed of a plurality of planes approximated to the curved surface is a region close to the valley of the lens unit.
JP63245428A 1988-09-29 1988-09-29 Fresnel lens sheet Expired - Fee Related JP2895070B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63245428A JP2895070B2 (en) 1988-09-29 1988-09-29 Fresnel lens sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63245428A JP2895070B2 (en) 1988-09-29 1988-09-29 Fresnel lens sheet

Publications (2)

Publication Number Publication Date
JPH0293401A true JPH0293401A (en) 1990-04-04
JP2895070B2 JP2895070B2 (en) 1999-05-24

Family

ID=17133511

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63245428A Expired - Fee Related JP2895070B2 (en) 1988-09-29 1988-09-29 Fresnel lens sheet

Country Status (1)

Country Link
JP (1) JP2895070B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572955A1 (en) 1992-05-30 1993-12-08 HOME Co., Ltd. Connector, method for connecting structural members with connector and connection structure between structural members
US5466086A (en) * 1992-05-30 1995-11-14 Home Co., Ltd. Connector, method for connecting structural members with connector and connection structure between structural members
JP2017067831A (en) * 2015-09-28 2017-04-06 三菱電機株式会社 Lens and light-emitting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572955A1 (en) 1992-05-30 1993-12-08 HOME Co., Ltd. Connector, method for connecting structural members with connector and connection structure between structural members
US5466086A (en) * 1992-05-30 1995-11-14 Home Co., Ltd. Connector, method for connecting structural members with connector and connection structure between structural members
JP2017067831A (en) * 2015-09-28 2017-04-06 三菱電機株式会社 Lens and light-emitting device

Also Published As

Publication number Publication date
JP2895070B2 (en) 1999-05-24

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