JP2676909B2 - Image reading device - Google Patents
Image reading deviceInfo
- Publication number
- JP2676909B2 JP2676909B2 JP1112977A JP11297789A JP2676909B2 JP 2676909 B2 JP2676909 B2 JP 2676909B2 JP 1112977 A JP1112977 A JP 1112977A JP 11297789 A JP11297789 A JP 11297789A JP 2676909 B2 JP2676909 B2 JP 2676909B2
- Authority
- JP
- Japan
- Prior art keywords
- image
- fresnel lens
- projection
- lens
- axis
- 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 - Fee Related
Links
Landscapes
- Variable Magnification In Projection-Type Copying Machines (AREA)
- Optical Systems Of Projection Type Copiers (AREA)
- Facsimiles In General (AREA)
- Facsimile Scanning Arrangements (AREA)
- Projection-Type Copiers In General (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は画像読取装置に関し、特にフィルムやシート
原稿等の透過型や反射型の画像を投影レンズにより所定
面上に投影し、該投影画像を画像読取り手段で読取る際
に好適な画像読取装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and in particular, a transmissive or reflective image of a film or sheet original is projected by a projection lens onto a predetermined surface, and the projected image is projected. The present invention relates to an image reading apparatus suitable for reading an image by an image reading unit.
（従来の技術） 従来よりフィルム等の透過型画像を投影レンズにより
所定面上に投影し、該投影画像を画像読取り手段で読取
るようにした画像読取装置が種々と提案されている。(Prior Art) Conventionally, various image reading apparatuses have been proposed in which a transmission image such as a film is projected onto a predetermined surface by a projection lens and the projected image is read by an image reading means.
第５図（Ａ）はこの種の画像読取装置の要部断面概略
図、第５図（Ｂ）は同図（Ａ）のＢ方向から見た要部概
略図である。FIG. 5 (A) is a schematic cross-sectional view of an essential part of this type of image reading apparatus, and FIG. 5 (B) is a schematic view of the essential part viewed from the direction B in FIG. 5 (A).
同図において１は投影装置であり、照明手段1bで照明
されたフィルム画像1aを投影レンズ1cによりミラー２を
介して透過型フルネルレンズ３近傍に空中像として投影
している。In the figure, 1 is a projection device, which projects a film image 1a illuminated by an illumination means 1b as an aerial image in the vicinity of a transmission type Fresnel lens 3 via a mirror 2 by a projection lens 1c.
そして透過型フルネルレンズ３近傍に形成された投影
画像を読取装置６を構成する読取り手段５で読取ってい
る。Then, the projection image formed in the vicinity of the transmission type Fresnel lens 3 is read by the reading means 5 which constitutes the reading device 6.
ここで透過型フルネルレンズ３は投影レンズ1cで投影
された投影画像に基づく光束が読取り手段５に効果的に
入射するような光学的作用を有している。Here, the transmission type Fresnel lens 3 has an optical function such that a light beam based on the projection image projected by the projection lens 1c is effectively incident on the reading means 5.
同図に示す画像読取装置において投影画像を読取る際
には、予め投影画像が所定面上にピントが合って投影さ
れているか否かのピント調製を行っている。When the projection image is read by the image reading apparatus shown in the same figure, focus adjustment is performed in advance to determine whether or not the projection image is projected on a predetermined surface in focus.
このときのピント調製としては挿脱可能な白色拡散板
７を例えば透過型フルネルレンズ３と読取装置６の透明
基板6aとの間に装着し、第５図（Ｂ）に示すように観察
者Ａが上方から観察しながら行っている。In order to adjust the focus at this time, an insertable / detachable white diffuser plate 7 is attached, for example, between the transmission type Fresnel lens 3 and the transparent substrate 6a of the reading device 6, and as shown in FIG. A is observing from above.
（発明が解決しようとする問題点） 第５図（Ｂ）に示すように白色拡散板７を用いて、該
白色拡散板７面上に形成される投影画像の結像状態（ピ
ント状態）を観察しながら調整する場合、一般に白色拡
散板７から拡散反射し、観察者Ａの眼に入射する光量は
少ない。この為白色拡散板７を用いると投影画像が暗く
なりピント調整が大変難しいという問題点があった。(Problems to be Solved by the Invention) As shown in FIG. 5 (B), a white diffusion plate 7 is used, and an image formation state (focus state) of a projection image formed on the surface of the white diffusion plate 7 is changed. When adjusting while observing, the amount of light that is diffusely reflected from the white diffuser plate 7 and is incident on the eyes of the observer A is small. Therefore, when the white diffuser plate 7 is used, the projected image becomes dark and it is very difficult to adjust the focus.
本発明は投影レンズによって所定面上に形成される投
影画像の結像状態を簡易な構成の反射軸外型フルネルレ
ンズを用いることにより、容易にしかも精度良く調整す
ることができ、投影画像を高精度に読取ることのできる
画像読取装置の提供を目的とする。According to the present invention, the image formation state of the projection image formed on the predetermined surface by the projection lens can be easily and accurately adjusted by using the off-axis reflection type Fresnel lens having a simple structure, and the projection image can be adjusted. An object is to provide an image reading device that can read with high accuracy.
（問題点を解決するための手段） 本発明の画像読取装置は照明手段により照明された画
像を投影レンズにより透過型フレネルレンズ近傍に投影
し、該透過型フレネルレンズ近傍に形成した投影画像を
読取り手段で読取る際、該投影画像が形成されている近
傍に挿脱可能な反射軸外型フレネルレンズを設け、該反
射軸外型フレネルレンズからの反射光束を利用して該投
影画像の結像状態を調べるようにしたことを特徴として
いる。(Means for Solving Problems) An image reading apparatus of the present invention projects an image illuminated by an illumination means by a projection lens in the vicinity of a transmission type Fresnel lens and reads a projection image formed in the vicinity of the transmission type Fresnel lens. When the image is read by means, an off-axis reflection type Fresnel lens that can be inserted / removed is provided in the vicinity of the projection image formed, and the reflected light from the off-axis Fresnel lens of the reflection type is used to form the imaged state of the projection image. The feature is that it was made to check.
（実施例） 第１図は本発明の画像読取装置の一実施例の要部概略
図である。(Embodiment) FIG. 1 is a schematic view of a main part of an embodiment of an image reading apparatus of the present invention.
同図に示す画像読取装置の基本構成は第５図（Ａ）の
画像読取装置と同様である。The basic configuration of the image reading apparatus shown in the same drawing is the same as that of the image reading apparatus shown in FIG.
即ち、同図において１は投影装置であり、照明手段1b
で照明された透過型のフィルム画像1aを投影レンズ1cに
よりミラー２を介し透過型フレネルレンス３近傍に空中
像として投影している。そして透過型フレネルレンズ３
近傍に形成された投影画像を読取装置６を構成する読取
り手段５で読取っている。That is, in the figure, reference numeral 1 is a projection device, and illumination means 1b
The transmission type film image 1a illuminated by is projected as an aerial image in the vicinity of the transmission type Fresnel lens 3 through the mirror 2 by the projection lens 1c. And transmission type Fresnel lens 3
The projection image formed in the vicinity is read by the reading unit 5 included in the reading device 6.
読取り手段５は例えば複数の集光レンズを一次元方向
に並べた読取りレンズ5aと複数の受光素子を一次元方向
に並べた受光部5bを有している。そして読取り手段５を
同図の矢印5cの方向に投影画像面に沿って移動させ該投
影画像の読取りを行っている。The reading means 5 has, for example, a reading lens 5a in which a plurality of condenser lenses are arranged in a one-dimensional direction and a light receiving section 5b in which a plurality of light receiving elements are arranged in a one-dimensional direction. Then, the reading means 5 is moved in the direction of the arrow 5c in the figure along the projection image plane to read the projection image.
尚、透過型フレネルレンズ３は投影レンズ1cで投影さ
れた投影画像に基づく光束が読取り手段５に効果的に入
射するようにしているが、本実施例においては光量が十
分であれば省略しても良い。The transmissive Fresnel lens 3 is designed so that the light flux based on the projection image projected by the projection lens 1c is effectively incident on the reading means 5, but in the present embodiment, it is omitted if the light quantity is sufficient. Is also good.
次に本実施例において投影装置１によって透過型フレ
ネルレンズ３近傍に形成された投影画像の結像状態（ピ
ント状態）を調整する場合を説明する。Next, a case will be described in which the image forming state (focus state) of the projection image formed in the vicinity of the transmissive Fresnel lens 3 by the projection device 1 is adjusted in the present embodiment.
このときは、まず入射光束を所定方向に多く反射（拡
散反射）させるような配光特性を有した所謂反射軸外型
フレネルレンズ４を透過型フレネルレンズ３と読取装置
６の透明基板6aとの間に挿脱可能に挿着する。At this time, first, a so-called off-axis Fresnel lens 4 having a light distribution characteristic that reflects (diffuses and reflects) the incident light beam in a predetermined direction is formed between the transmission Fresnel lens 3 and the transparent substrate 6a of the reading device 6. Insert it in a removable manner.
第２図（Ａ）はこのときの透過型フレネルレンズ３と
反射軸外型フレネルレンズ４との関係を上方から見た概
略図、第２図（Ｂ）は透過型フレネルレンズ３を通過
し、反射軸外型フレネルレンズ４で反射し、観察者Ａの
眼に入射する光束状態を示した概略図である。2 (A) is a schematic view of the relationship between the transmission type Fresnel lens 3 and the reflection off-axis type Fresnel lens 4 seen from above, and FIG. 2 (B) passes through the transmission type Fresnel lens 3, 6 is a schematic diagram showing a state of a light beam which is reflected by the off-reflecting Fresnel lens 4 and is incident on an eye of an observer A. FIG.
第２図（Ｂ）に示すように反射軸外型フレネルレンズ
４を用いることにより観察者Ａの眼に投影画像に基づく
光束が多く導光されるようにし、これにより反射軸外型
フレネルレンズ近傍に形成される投影画像のピント状態
の調整を良好に行っている。As shown in FIG. 2 (B), a large amount of light flux based on the projected image is guided to the eye of the observer A by using the off-reflecting Fresnel lens 4 for reflection, and thereby the Fresnel off-reflecting lens vicinity is provided. The focus state of the projected image formed on the image is adjusted well.
本実施例において反射軸外型フレネルレンズ４を透過
型フレネルレンズ３と透明基板6aとの間に挿着する方法
としては直接挿着しても良いが透過型フレネルレンズ３
をミラー２側に跳ね上げてから透明基板6a上に載置し、
その後透過型フレネルレンズ３を元の位置に戻すように
して行っても良い。In this embodiment, the off-axis Fresnel lens 4 may be directly attached to the transmission Fresnel lens 3 and the transparent substrate 6a, but the transmission Fresnel lens 3 may be used.
Is flipped up to the mirror 2 side and placed on the transparent substrate 6a,
After that, the transmission type Fresnel lens 3 may be returned to its original position.
反射軸外型フレネルレンズの形状としては平板の他
に、例えば第３図に示すように塩ビシートにフレネルパ
ターンを形成し、巻取収納式により、透明基板6a面上に
挿着するようにしても良い。As for the shape of the off-axis reflection type Fresnel lens, in addition to a flat plate, for example, a Fresnel pattern is formed on a PVC sheet as shown in FIG. Is also good.
又、反射軸外型フレネルレンズ４の上方に第４図に示
すように反射軸外型フレネルレンズ４の厚さｔの2.5〜
４倍程度の厚さ（例えば３倍の厚さ3t）を有するアクリ
ル板やガラス板（反射軸外型フレネルレンズ、アクリル
板、ガラス板等の材質の屈折率が1.5程度とした場合）
を設けて、これらの部材と一体的に透明基板6a面上に挿
脱させても良い。これによればフレネル反射面までの光
路長が透明基板6a面までの光路長と挿入前後で変化しな
い為、より高精度のピント調整が出来ると共にフレネル
反射面に付着しやすい粉塵等の清掃が容易になるので好
ましい。In addition, as shown in FIG. 4, above the off-reflection type Fresnel lens 4, the thickness t of the off-reflection type Fresnel lens 4 is 2.5 to
Acrylic plate or glass plate having about 4 times the thickness (for example, 3 times as thick as 3t) (when the refractive index of the material such as off-axis Fresnel lens, acrylic plate, glass plate is about 1.5)
May be provided, and these members may be integrally inserted into and removed from the surface of the transparent substrate 6a. According to this, since the optical path length to the Fresnel reflection surface does not change with the optical path length to the transparent substrate 6a surface before and after insertion, it is possible to perform more precise focus adjustment and easy cleaning of dust or the like that tends to adhere to the Fresnel reflection surface. Therefore, it is preferable.
（発明の効果） 本発明によれば前述の構成の反射軸外型フレネルレン
ズを投影画像の形成されている近傍にピント板として挿
脱可能に用いることにより、投影画像に基づく多くの光
束を観察者の眼に導光することが出来、高精度に投影画
像のピント状態を調整することができ、投影画像の読取
りを高精度に行うことのできる画像読取装置を達成する
ことができる。(Effect of the Invention) According to the present invention, a large number of light fluxes based on a projected image are observed by using the off-axis reflection type Fresnel lens having the above-mentioned configuration as a focusing plate in the vicinity of where the projected image is formed so as to be detachable. It is possible to achieve an image reading device that can guide light to the eyes of a person, can adjust the focus state of a projected image with high accuracy, and can read the projected image with high accuracy.
第１図は本発明の一実施例の要部概略図、第２図
（Ａ）、（Ｂ）は第１図の一部分の説明図、第３図、第
４図は各々第１図の反射軸外型フレネルレンズの他の一
実施例の概略図、第５図（Ａ）、（Ｂ）は従来の画像読
取装置の概略図である。 図中１は投影装置、1aは画像、1bは照明手段、1cは投影
レンズ、２はミラー、３は透過型フレネルレンズ、４は
反射軸外型フレネルレンズ、５は読取り手段、６は読取
装置、７は白色拡散板、6aは透明基板、である。1 is a schematic view of a main part of an embodiment of the present invention, FIGS. 2 (A) and 2 (B) are explanatory views of a part of FIG. 1, and FIGS. 3 and 4 are reflections of FIG. 1, respectively. FIGS. 5A and 5B are schematic diagrams of another embodiment of the off-axis type Fresnel lens, which is a schematic diagram of a conventional image reading apparatus. In the figure, 1 is a projection device, 1a is an image, 1b is an illumination means, 1c is a projection lens, 2 is a mirror, 3 is a transmissive Fresnel lens, 4 is a reflection off-axis Fresnel lens, 5 is a reading means, and 6 is a reading device. , 7 is a white diffuser, and 6a is a transparent substrate.
Claims (3)
ズにより透過型フレネルレンズ近傍に投影し、該透過型
フレネルレンズ近傍に形成した投影画像を読取り手段で
読取る際、該投影画像が形成されている近傍に挿脱可能
な反射軸外型フレネルレンズを設け、該反射軸外型フレ
ネルンレンズからの反射光束を利用して該投影画像の結
像状態を調べるようにしたことを特徴とする画像読取装
置。1. An image illuminated by an illuminating means is projected by a projection lens in the vicinity of a transmission type Fresnel lens, and when the projection image formed in the vicinity of the transmission type Fresnel lens is read by a reading means, the projection image is formed. An image characterized in that an off-axis reflection type Fresnel lens that can be inserted / removed is provided in the vicinity thereof and the image formation state of the projected image is examined by utilizing the reflected light flux from the reflection off-axis Fresnel lens. Reader.
シート状素材面上に形成されかつ巻取り収納可能に構成
されていることを特徴とする請求項１記載の画像読取装
置。2. The image reading apparatus according to claim 1, wherein the off-reflection Fresnel lens is formed on a surface of a flexible sheet material and can be wound and stored.
反射面側には該反射軸外型フレネルレンズの厚さの2.5
〜４倍の厚さの透明基板が一体的に設けられていること
を特徴とする請求項１記載の画像読取装置。3. The thickness of the off-axis Fresnel lens is 2.5 times the thickness of the off-axis Fresnel lens on the Fresnel reflection surface side.
The image reading apparatus according to claim 1, wherein a transparent substrate having a thickness of about 4 times is integrally provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1112977A JP2676909B2 (en) | 1989-05-02 | 1989-05-02 | Image reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1112977A JP2676909B2 (en) | 1989-05-02 | 1989-05-02 | Image reading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02293726A JPH02293726A (en) | 1990-12-04 |
| JP2676909B2 true JP2676909B2 (en) | 1997-11-17 |
Family
ID=14600305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1112977A Expired - Fee Related JP2676909B2 (en) | 1989-05-02 | 1989-05-02 | Image reading device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2676909B2 (en) |
-
1989
- 1989-05-02 JP JP1112977A patent/JP2676909B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02293726A (en) | 1990-12-04 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |