JPH04368050A - Projector - Google Patents

Abstract

PURPOSE:To simplify focusing of a picture by providing a means advancing an index member for focusing into a projection optical path in a way of making the member closely adhere to a film original to the projector. CONSTITUTION:In the stage of focus adjustment, a turning level set in the state of 2-dashed chain lines is turned counter clockwise, and a holder 22 is moved in a direction (a) while a lower face of a tip 22b is in slide contact with an index projection 23 because its shaft 22a is pressed onto a U-shaped section 25b of the lever 25. Furthermore, when the holder 22 is progressed into the direction (a) further, a lower projection 22c of the holder 22 strikes on the index projection 23. In this case, since one end 24a of a slot 24 of a case is formed wider than the other part, the shaft 22a of the holder 22 is detached from the press contact state with the U shaped part 25b of the lever 25, the holder 22 is turned clockwise around the index projection 23 by its self-weight till an index film 21 is press contact onto the film, the holder 22 reaches the state shown in solid lines thereby implementing focus adjustment. That is, the focusing state is obtained by a projection index on a Fresnel lens.

Description

【発明の詳細な説明】[Detailed description of the invention]

【０００１】0001

【産業上の利用分野】本発明はフイルム画像を画像読み
取り装置上へ投影するフイルム投影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 a film projection device for projecting a film image onto an image reading device.

【０００２】0002

【従来の技術】従来、フイルム投影装置は図６及び図７
に示すよう構成されている。すなわち図６に示すフイル
ム投影装置においては、投影光源２から発した光束が反
射鏡１で反射された光とともに集光レンズ３、４を通し
てフイルム保持部材５内のフイルムＦを照射し、照射さ
れたフイルムＦからの光像が投影レンズ６、フレネルレ
ンズ８を介して画像読み取り装置の原稿台ガラス９上に
投影される様構成されている。この装置においてピント
調整を行なう場合は装置使用者が投影像を視認しながら
ピント調整つまみ１１を回すことにより中間ギア１０を
介して投影レンズ６を保持している鏡筒７を上下させ所
定のピント合焦状態を得るものである。これを斜視図に
示したのが図７である。[Prior Art] Conventionally, a film projection device is shown in FIGS. 6 and 7.
It is configured as shown in . That is, in the film projection apparatus shown in FIG. 6, the light beam emitted from the projection light source 2, together with the light reflected by the reflecting mirror 1, passes through the condensing lenses 3 and 4 and irradiates the film F in the film holding member 5. It is configured such that a light image from the film F is projected onto a document table glass 9 of an image reading device via a projection lens 6 and a Fresnel lens 8. When adjusting the focus in this device, the user of the device turns the focus adjustment knob 11 while viewing the projected image to move the lens barrel 7 holding the projection lens 6 up and down via the intermediate gear 10 until a predetermined focus is achieved. This is to obtain a focused state. FIG. 7 shows this in a perspective view.

【０００３】0003

【発明が解決しようとする課題】しかしながら上記従来
装置では、装置使用者がピント調整しづらく、ピント合
焦状態不十分のまま、画像読み取りを行なうことにより
、いわゆるピンボケの画像になる場合があるという欠点
があった。つまり良好な画像品位を得る上では、図７に
示すように装置使用者がフルネルレンズ８上の投影画像
を視認しながらピント調整つまみ１１を回し、適宜良好
なピント合焦状態にする事が必要となるが、投影画像内
にピント合焦・非合焦の判断基準となる適当な画像エツ
ジ部の様な高コントラスト部があれば比較的容易に確実
な合焦状態が得られるが、その反対の投影画像内に適当
なエツジ部が少ないケースでは、装置使用者の熟練度に
よってはピント非合焦の状態となり良好な画像品位が得
られないというものである。[Problems to be Solved by the Invention] However, with the above-mentioned conventional device, it is difficult for the device user to adjust the focus, and if the image is read with insufficient focus, it may result in a so-called out-of-focus image. There were drawbacks. In other words, in order to obtain good image quality, it is necessary for the user of the device to turn the focus adjustment knob 11 while visually checking the projected image on the Fresnel lens 8, as shown in FIG. 7, to bring it into good focus as appropriate. However, if there is a high-contrast area in the projected image, such as an appropriate image edge area, which can be used as a criterion for determining whether the image is in-focus or out-of-focus, a reliable in-focus state can be obtained relatively easily. In the case where there are few suitable edge portions in the opposite projected image, depending on the skill level of the user of the device, the device may be out of focus and good image quality may not be obtained.

【０００４】また投影画像内に適当な画像エツジ部（高
コントラスト部）がある場合でも、ネガフイルム原稿を
投影時は、画像を反転させているため実画像の明るい所
は投影画像では暗くなってしまうため、ポジフイルム原
稿に比べるとピント調整作業が数段難しく、良好な画像
品位が得られない確率がさらに高まってしまう。Furthermore, even if there are appropriate image edges (high contrast areas) in the projected image, when projecting a negative film original, the image is inverted, so bright areas in the actual image become dark in the projected image. Therefore, the focus adjustment work is much more difficult than with positive film originals, and the probability of not being able to obtain good image quality is further increased.

【０００５】[0005]

【課題を解決するための手段】本発明はピント調整機構
を有し、フイルム原稿を画像読み取り装置上に投影する
フイルム投影装置において、ピント合わせ用の指標部材
をフイルム原稿に密着させる形で投影光路内に進入させ
る手段を設けることにより装置使用者がピント調整する
際に、明瞭な画像エツジ部を有する該指標の投影像の合
焦状態を見ながらピントの合焦・非合焦の判別が行なえ
る様にし、良好な合焦状態を得られる様にしたものであ
る。[Means for Solving the Problems] The present invention provides a film projection device that has a focus adjustment mechanism and projects a film original onto an image reading device, in which an index member for focusing is brought into close contact with the film original so that the projection optical path is By providing a means for entering the index, when adjusting the focus, the user of the device can determine whether the target is in focus or out of focus while looking at the focused state of the projected image of the target having a clear image edge. This makes it possible to obtain a good in-focus state.

【０００６】また、該指標部材を少なくともフイルム原
稿面への当接間際には、フイルム原稿面の略直角方向よ
り当接させる手段を設けることにより指標部材とフイル
ム原稿面との当接時の摺擦を防ぎ、フイルム原稿への傷
を防止しながら上記合焦状態の判別容易化を行なったも
のである。Furthermore, by providing means for bringing the index member into contact with the film document surface from a direction substantially perpendicular to the film document surface at least when the index member is about to contact the film document surface, the sliding effect when the index member and the film document surface come into contact is reduced. This facilitates the determination of the in-focus state while preventing scratches and scratches on the film original.

【０００７】[0007]

【実施例】以下、本発明の一実施例を図１〜図３を用い
て説明する。図１は本発明に係るフイルム投影装置のフ
イルム原稿セツト部周辺の拡大図、図２は本発明の指標
の例、図３は本発明のフイルム投影装置のピント調整時
の様子を示す斜視図である。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is an enlarged view of the periphery of the film original setting section of the film projector according to the present invention, FIG. 2 is an example of the index of the present invention, and FIG. 3 is a perspective view showing the state of the film projector according to the present invention during focus adjustment. be.

【０００８】図１において２１は指標フイルムで、該フ
イルムはホルダー２２に貼り付けられており、ホルダー
２２は筐体の指示突起２３に上下方向を指示されながら
、軸２２ａを筐体に設けられた長穴２４に係合させつつ
、回動軸２５ａを筐体に係合させた回動レバー２５の先
端のＵ時部２５ｂにより保持されている。図中２点鎖線
の状態にあるホルダー２２はその先端２２ｂ及び指標フ
イルム２１が図中２点鎖線で示した投影光路領域外に退
避している。ここでピント調整作業に入ると、不図示の
機構により、２点鎖線の状態にある回動レバー２５が図
中反時計回りに回動する。これによりホルダー２２は、
回動レバー２５のＵ時部２５ｂに軸２２ａが押される事
によりその先端２２ｂ下面を指示突起２３に摺擦させな
がら図中ａ方向に移動していく。さらにホルダー２２が
ａ方向へ進むとホルダー２２の下部突起２２ｃが指示突
起２３に付き当たる。ここで筐体の長穴２４の一端２４
ａは他の部分より幅広く形成されているので、ホルダー
２２の軸２２ａは回動レバー２５のＵ字部２５ｂとの当
接状態から離間しホルダー２２はその自重により指示突
起２３を支点として指標フイルム２１がフイルムＦに当
接するまで図中時計回りに回転し、図中実線状態となる
。従って指標フイルム２１はフイルムＦの略鉛直上方か
ら当接していく事になるので当接時の指標フイルム２１
とフイルムＦの摺擦を防ぐことが可能となる。この状態
での装置使用者のピント調整作業が終了すると、不図示
の機構により回動レバー２５は図中時計回りに回転させ
られる。これにて回動レバー２５の先端Ｕ字部２５ｂが
ホルダー２２の軸２２ａに当接し、さらに回動レバー２
５が回転するとホルダー２２は指示突起２３を支点とし
て引き起される様に図中反時計回りに回転する。これに
より指標フイルム２１とフイルムＦの当接状態は解除さ
れるが、この時も、指標フイルム２１はフイルムＦの鉛
直上方に移動するので、指標フイルム２１とフイルムＦ
の摺擦を防ぐことができる。さらに回動レバー２５が図
中時計回りに回転するとホルダー２は図中ｂ方向に移動
し、ついには図中２点鎖線の状態となる。先に述べた様
に、この状態ではホルダー２２の先端２２ｂ及び指標フ
イルム２１は図中２点鎖線で示した、投影光路領域外に
退避しているので、実際のフイルム投影像の読み取り動
作が可能となる。In FIG. 1, reference numeral 21 denotes an index film, which is attached to a holder 22, and the holder 22 has a shaft 22a provided in the housing while being directed up and down by an indicating protrusion 23 on the housing. It is held by a U-shaped portion 25b at the tip of a rotary lever 25 which has a rotary shaft 25a engaged with a housing while being engaged with an elongated hole 24. The tip 22b and the index film 21 of the holder 22, which is in the state shown by the two-dot chain line in the figure, are retracted outside the projection optical path region shown by the two-dot chain line in the figure. When the focus adjustment operation is started, a mechanism (not shown) rotates the rotary lever 25, which is indicated by a two-dot chain line, counterclockwise in the figure. As a result, the holder 22
When the shaft 22a is pushed by the U-shaped portion 25b of the rotating lever 25, the lower surface of the tip 22b slides against the indicating protrusion 23 while moving in the direction a in the figure. When the holder 22 further advances in the direction a, the lower protrusion 22c of the holder 22 comes into contact with the indicator protrusion 23. Here, one end 24 of the elongated hole 24 of the housing
Since a is formed wider than other parts, the shaft 22a of the holder 22 is separated from the state of contact with the U-shaped portion 25b of the rotating lever 25, and the holder 22 uses its own weight to move the index film around the indicator protrusion 23 as a fulcrum. 21 rotates clockwise in the figure until it comes into contact with the film F, as shown by the solid line in the figure. Therefore, since the index film 21 comes into contact with the film F from approximately vertically above, the index film 21 at the time of contact
This makes it possible to prevent the film F from being rubbed. When the user of the device completes the focus adjustment work in this state, the rotating lever 25 is rotated clockwise in the figure by a mechanism not shown. With this, the tip U-shaped portion 25b of the rotating lever 25 comes into contact with the shaft 22a of the holder 22, and the rotating lever 25 also comes into contact with the shaft 22a of the holder 22.
5 rotates, the holder 22 rotates counterclockwise in the figure so as to be pulled up using the indicator protrusion 23 as a fulcrum. This releases the contact state between the index film 21 and the film F, but at this time as well, the index film 21 moves vertically above the film F, so the index film 21 and the film F
can prevent rubbing. When the rotation lever 25 further rotates clockwise in the figure, the holder 2 moves in the direction b in the figure, and finally reaches the state shown by the two-dot chain line in the figure. As mentioned earlier, in this state, the tip 22b of the holder 22 and the index film 21 are retracted outside the projection optical path region shown by the two-dot chain line in the figure, so that the actual reading operation of the film projection image is possible. becomes.

【０００９】次に、指標フイルム２１に形成された指標
の例を図２に示す。Next, an example of indicators formed on the indicator film 21 is shown in FIG.

【００１０】図２の（イ）〜（ハ）に示す様に指標はピ
ント調整動作にピントの合焦・非合焦は判別しやすい様
に画像エツジが明瞭なものが好ましい。これらの指標の
うち（イ）を採用しピント調整時の様子を示したのが図
３である。ここで装置使用者はフレネルレンズ８上に投
影された投影画像内に重ね合わされた投影指標２５を視
認しながら、ピント調整ツマミ１１を適宜回転させ、ピ
ント合焦状態を得る。As shown in FIGS. 2A to 2C, it is preferable that the index has a clear image edge so that it is easy to distinguish between in-focus and out-of-focus during the focus adjustment operation. FIG. 3 shows the situation when adjusting the focus using index (a) among these indicators. Here, the user of the apparatus, while visually checking the projection index 25 superimposed on the projection image projected onto the Fresnel lens 8, appropriately rotates the focus adjustment knob 11 to obtain a focused state.

【００１１】図４は本発明の他の実施例を示す要部構成
図である。本実施例では筐体に軸３２ａを中心として揺
動可能に指示されたホルダー３２により保持された指標
フイルム３１はピント調整時にはその弾性力を利用して
フイルムＦ下面に当接している。フイルムＦ上の画像は
、フイルムＦの上面に形成されているため、このケース
では指標位置が実際のフイルム画像よりフイルムＦの厚
み（通常０．１ｍｍ程度）分だけズレた位置となるが、
フイルム投影装置の投影レンズ６の被写体深度がフイル
ムＦの厚み以上あれば、指標の投影像の合焦状態とフイ
ルム原稿の投影像の合焦状態は実用上等価と見なせるた
め、フイルム原稿の投影像を見てピント調整を行なう変
わりに指標の投影像を見てピント調整を行なうことに問
題はない。FIG. 4 is a block diagram of main parts showing another embodiment of the present invention. In this embodiment, the index film 31 held by a holder 32 which is pivoted in the housing about a shaft 32a is brought into contact with the lower surface of the film F by utilizing its elastic force during focus adjustment. Since the image on the film F is formed on the top surface of the film F, in this case, the index position is shifted from the actual film image by the thickness of the film F (usually about 0.1 mm).
If the depth of field of the projection lens 6 of the film projection device is equal to or greater than the thickness of the film F, the focused state of the projected image of the index and the focused state of the projected image of the film original can be considered to be practically equivalent, so that the projected image of the film original There is no problem in adjusting the focus by looking at the projected image of the index instead of adjusting the focus by looking at the image.

【００１２】又、本実施例において、画像読み取り時に
は不図示の機構によりホルダー３２が図中３２ａを中心
にｄ方向に回転し、図中２点鎖線の状態となり、投影光
路外に退避する。本実施例においてもフイルムＦのほぼ
鉛直下方から指標フイルム３１が当接、離間するので、
フイルムＦと指標フイルム３１の摺擦は最小限に押えら
れる。Further, in this embodiment, when reading an image, the holder 32 is rotated in the direction d about 32a in the figure by a mechanism not shown, and is retracted out of the projection optical path as shown by the two-dot chain line in the figure. In this embodiment as well, the index film 31 comes into contact with and separates from the film F from almost vertically below.
Abrasion between the film F and the index film 31 is kept to a minimum.

【００１３】図５はさらに他の実施例を示す要部構成図
である。本実施例では先に２つの実施例とは異なり、指
標フイルム４１を保持したホルダー４２は、フイルム投
影装置本体ではなく、フイルム投影装置本体に着脱可能
にセツトされているフイルム保持部材５に取付けられて
いる。すなわちホルダー４２はその一端にある軸４２ａ
を中心として揺動可能にフイルム保持部材５の軸受部５
ａに指示されており、実線のセツト状態、２点鎖線の退
避状態が可能となっている。本実施例の様に指標フイル
ムは、フイルム保持部材等のフイルム投影装置本体以外
に配設されていても、本発明の実施は可能である。FIG. 5 is a block diagram showing a main part of still another embodiment. In this embodiment, unlike the previous two embodiments, the holder 42 holding the index film 41 is attached not to the film projection apparatus main body but to the film holding member 5 which is detachably set in the film projection apparatus main body. ing. That is, the holder 42 has a shaft 42a at one end thereof.
The bearing portion 5 of the film holding member 5 is pivotable about the
a, and the set state shown by the solid line and the retreated state shown by the two-dot chain line are possible. The present invention can be practiced even if the index film is disposed outside the main body of the film projection apparatus, such as a film holding member, as in this embodiment.

【００１４】[0014]

【発明の効果】以上説明したように、本発明ではピント
調整機構を有し、フイルム原稿を画像読み取り装置上に
投影するフイルム投影装置において、ピント合わせ用の
指標部材をフイルム原稿に密着させる形で投影光路内に
進入させる手段を設けたものであるので、明瞭な画像エ
ツジ部が少なく、ピント調整しづらいフイルム原稿や、
画像を反転させているため全体的に暗く、コントラスト
にはっきりしないネガフイルム原稿においても明瞭な画
像構成を持つ投影指標を見ながら合焦状態を判断し、ピ
ント調整を行なうことが出来る。よってピント調整作業
の習塾度にかかわらずピンボケすることない良好な画像
品位が得られるという効果がある。As explained above, in the present invention, in a film projection device having a focus adjustment mechanism and projecting a film original onto an image reading device, the index member for focusing is brought into close contact with the film original. Since it is equipped with a means to enter the projection optical path, it can be used for film originals that have few clear image edges and are difficult to adjust the focus.
Since the image is inverted, it is possible to judge the in-focus state and adjust the focus while looking at the projection index, which has a clear image structure, even for negative film originals that are dark overall and have unclear contrast. Therefore, there is an effect that good image quality without blurring can be obtained regardless of the degree of skill in the focus adjustment work.

【００１５】また、該指標部材を少なくともフイルム原
稿面への当接間際には、フイルム原稿の略直角方向より
当接させる手段を設けているので、指標部材とフイルム
原稿面との当接時の摺擦を防ぎ、指標部材のフイルム原
稿への当接に伴なう摺擦傷を防ぎながら、上記合焦状態
の判別容易化が行なえるという効果も有する。Further, since a means is provided for bringing the index member into contact with the film document surface from a substantially perpendicular direction, at least when the index member is about to contact the film document surface, the index member is brought into contact with the film document surface in a substantially perpendicular direction. It also has the effect that the in-focus state can be easily determined while preventing rubbing and scratches caused by the contact of the index member with the film document.

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

【図１】本発明に係るフイルム投影装置の要部構成の一
実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the configuration of main parts of a film projection apparatus according to the present invention.

【図２】図１における指標の例を示す説明図である。FIG. 2 is an explanatory diagram showing an example of indicators in FIG. 1;

【図３】図１の構成を有するフイルム投影装置の斜視図
である。FIG. 3 is a perspective view of a film projector having the configuration shown in FIG. 1;

【図４】本発明に係るフイルム投影装置の要部構成の他
の例を示す構成図である。FIG. 4 is a configuration diagram showing another example of the configuration of main parts of the film projection device according to the present invention.

【図５】本発明に係るフイルム投影装置の要部構成の他
の例を示す構成図である。FIG. 5 is a configuration diagram showing another example of the configuration of main parts of the film projection device according to the present invention.

【図６】従来のフイルム投影装置の断面図である。FIG. 6 is a sectional view of a conventional film projection device.

【図７】従来のフイルム投影装置の斜視図である。FIG. 7 is a perspective view of a conventional film projection device.

【符号の説明】[Explanation of symbols]

２１　　指標フイルム ３１　　指標フイルム ４１　　指標フイルム ２２　　ホルダー 21 Indicator film 31 Indicator film 41 Indicator film 22 Holder

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】　　光源により照明される原稿からの画像
を、ピント調節機構を介して画像読み取り装置上に投影
する投影装置において、ピント調整用の指標部材を前記
原稿に当接する位置へ進入させる移動部材を設け、ピン
ト調節に際し、前記指標部材の像を前記読み取り装置上
に投影した事を特徴とする投影装置。1. In a projection device that projects an image from a document illuminated by a light source onto an image reading device via a focus adjustment mechanism, moving an index member for focus adjustment to a position where it comes into contact with the document; 1. A projection device comprising: a member, and an image of the index member is projected onto the reading device during focus adjustment.