JP3627837B2

JP3627837B2 - Mirror holding device for image reading device

Info

Publication number: JP3627837B2
Application number: JP22199497A
Authority: JP
Inventors: 秀彰松井; 和久須藤
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 1997-08-04
Filing date: 1997-08-04
Publication date: 2005-03-09
Anticipated expiration: 2017-08-04
Also published as: JPH1152494A

Description

【０００１】
【発明の属する技術分野】
本発明は複写機、プリンタ、普通紙ファクシミリ装置等の様に、光源、ミラーから成る画像読取り装置を備えた画像形成装置に関し、特に画像読取り装置を構成する平面ミラーの保持装置の改良に関する。
【０００２】
【従来の技術】
画像読取り装置は、コンタクトガラス上に載置した原稿に対して光を照射する為の光源と、原稿面からの反射光を所定方向に導くミラー、レンズ等から構成されている。これらの光学部品は、通常保持部材（走行体）により支持されており、保持部材の移動による振動、衝撃によって光学部品が位置ずれを起こしたり、脱落することがないようにその保持方法に種々の配慮がなされている。
従来の走査光学系に用いられる複数の平面ミラーは、アルミダイキャストのホルダーや、プレス加工された板状の保持部材の所定の取付部に平面ミラーをはめ込んだ状態で弾性部材によってミラー面を押圧することにより、所定の角度、位置で位置決め固定される。
このような保持部材としては、小型軽量化、コストダウン化を図る為に、プレス加工により形成された板状の保持部材に対して、平面ミラーの両端側を３点支持によって無調整にて取付け固定しているものが知られている（実公昭５９−１６８８４号公報）。
ところで、近年では画像読取り装置、画像形成装置の小型軽量化、コストダウン化が求められ、その結果、極限まで構成部品を小型化、軽量化することが必要とされている。しかし、ミラーの反射面の面積の小型化には、露光量、露光幅等の機能に基づく要請からおのずと制約があり、ある一定寸法よりも小さくすることはできない。そこで、ミラーを保持する保持部材を従来の穴形状から、切欠き形状にすることにより、機能低下を招かない小型化に成功した。
【０００３】
即ち、図６（ａ）（ｂ）（ｃ）及び図７（ａ）（ｂ）は従来の平面ミラーの保持部材の構成を示す説明図であり、図６は保持部材が穴形状の場合、図７は保持部材が切欠き形状である場合を示している。図６において、符号１はミラー保持部材であり、このミラー保持部材１の板面には、ミラー取付部としての穴形状部２が形成され、各穴形状部２の内周にはミラーを受ける突起部５と、弾性固定部材６と係合する段差（凹所）４が対向位置関係で形成されている。ミラー３は図６（ａ）（ｂ）に示す様にその長手方向両端部を穴形状部２内に差し入れてから、段差４内に弾性固定部材６を嵌着することによって、穴形状部２内に固定される。弾性固定部材６は、（ｃ）に示す様に金属板等を図示の様に、Ｕ字状或はＶ字状に成形すると共に、その一片６ａの適所に係合溝７を形成し、更に、両片６ａ、６ｂの端縁を９０度程度屈曲させて抜け止めとした構成を備えている。弾性固定部材６を段差４内に圧入した時に、係合溝７が段差４の対向し合う端縁に嵌合することにより弾性固定部材６は位置決めされる。
【０００４】
また、図７（ａ）（ｂ）のミラー取付部は、切欠き形状部２’であり、この切欠き形状部２７内にミラー３を差し込んだ状態でその両側面を突起部５と弾性固定部材６により押えることによりミラーを保持している。
このようにいずれのタイプの従来例においても、弾性固定部材６は係合溝７と段差４との係合によって、保持部材１に固定されるため、ミラー３が振動や衝撃に対してずれることはない。しかし、図６のミラー３は弾性固定部材６で押圧されて保持されているだけなので、矢印Ａ方向にずれることがあり、このようなずれが発生すると、ミラー取付部である穴形状部２の内周と接するミラー３の端部が破損する恐れがある。
又、図７の従来例の場合には、ミラー取付部が切り欠き形状部２’であるため、機械輸送時等の振動や衝撃で矢印Ｂの方向に飛び出し、ミラー３が脱落する可能性がある。
このような脱落、破損を防止する為に、特開平４−２０４９１０号公報（特許第２５１４４６９号）には、穴形状のミラー取付部内に差し込んだミラーの両面側に板バネを介在させた状態でミラーを挟圧保持するようにした技術が開示されているが、この従来例は、板バネから成る固定部材の形状が複雑になり、加工性、組付け性が悪くなり、特に切欠き形状のミラー保持部に対しては、有効な保持手段とはいえない。
【０００５】
【発明が解決しようとする課題】
本発明は上記に鑑みてなされたものであり、画像読取り装置の光学系を構成する平面ミラーを保持する保持部材の保持構造として、穴形状又は切欠き形状のミラー取付部内にミラーを嵌合した上で、板バネ状の弾性固定部材をミラー取付部内に圧入する構造を採用した場合に、振動、衝撃に起因してミラーがミラー取付部内から脱落したり、位置ずれを起こすことを有効に防止する様にした画像読取り装置のミラー保持装置を提供することを目的としている。
また、簡単な構成で組付け作業性もよく、安価で確実な横ずれ防止効果を備えた画像読取り装置のミラー保持装置を提供することを目的としている。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明は、板状のミラー保持部材に形成した穴形状又は切欠き形状のミラー取付部内に平板状のミラー端部を嵌合させた状態で、ミラーの非反射面とミラー取付部の内周面との間に板バネ状の弾性固定部材を圧入させることにより、ミラー取付部内にミラーを一定の位置精度を確保しつつ固定するミラー保持装置において、上記ミラー取付部の対向し合う内周面の一方には、ミラーの反射面側に当接する突起部が形成され、該内周面の他方には凹所が形成され、上記弾性固定部材は、帯状の板バネをＵ字状或はＶ字状に折り曲げ、折り曲げ部から２方向に伸びる第１及び第２の片の各先端縁を屈曲させて抜け止めとすると共に、第１の片の幅方向両端縁に前記凹所の対向し合う端縁に嵌合する係合溝を対向形成した構成を備え、上記ミラーの非反射面と上記弾性固定部材の第２の片との間であって、上記突起部と対向する位置を中心とした領域に、ミラーの面方向へのずれを防止するためのずれ防止手段を介在させたことを特徴とする。即ち、請求項１の発明によれば、機械輸送時やスキャナー走査時の振動や衝撃により、ミラーが穴や切欠き部よりずれ落ちたり横ずれして、穴の端面に当り、ミラー端部を破損することがなくなる。
請求項２の発明は、記ずれ防止手段を、接着剤としたことを特徴とする。
請求項３の発明は、上記ずれ防止手段を、両面テープとしたことを特徴とする。
請求項４の発明は、上記ずれ防止手段を、高摩擦抵抗部材としたことを特徴とする。
請求項２、３、４の発明によれば、ミラーと弾性固定部材の横ずれ防止をより確実にすることができる。
請求項５の発明は、上記ずれ防止手段は、上記ミラーの長手方向端縁を回避した手前側位置にて終端するように構成されていることを特徴とする。
請求項５の発明によれば、弾性固定部材を用いたミラーとミラー保持部材との固定作業性を向上することができる。
【０００７】
【発明の実施の形態】
以下、本発明の一形態例のミラー保持装置を添付図面に従って説明する。なお、図６、図７を併せて参照すると共に、同一部分には同一符号を付し、重複した説明は省略する。
図６、図７に示したように、ミラー取付部２、２’の対向し合う内周面の一方には、ミラー３の反射面３ｂ側に当接する突起部５が形成され、該内周面の他方には段差（凹所）４が形成されている。弾性固定部材６は、帯状の板バネをＵ字状或はＶ字状に折り曲げ、折り曲げ部から２方向に伸びる第１及び第２の片６ａ、６ｂの各先端縁を屈曲させて抜け止めとすると共に、第１の片６ａの幅方向両端縁に前記凹所４の対向し合う端縁に嵌合する係合溝７を対向形成した構成を備えている。
図１は本発明の特徴的な構成を示す斜視図であり、本発明では弾性固定部材６を穴形状部２、或は切欠き形状部２’内に圧入する際に、弾性固定部材６の第２の片６ｂがミラー３の非反射面３ａと接する位置に表面の摩擦抵抗が大きい高摩擦抵抗部材（例えば、ゴム、樹脂等の弾性材料）から成る板状のずれ防止手段８を介在させるようにした点が特徴的である。即ち、ミラー３の非反射面３ａと弾性固定部材６の第２の片６ｂとの間であって、突起部５と対向する位置を中心とした領域に、ミラーの面方向へのずれを防止するためのずれ防止手段８を介在させた点が特徴的である。
まず、図２は第１の形態例であり、この形態例では、弾性固定部材６の一つの片（第２の片）６ｂをミラー３の一面３ａ（非反射面）にあてがうことにより、ミラー３の他面（反射面）３ｂを穴形状部２又は切欠き形状部２’の内周縁の一部に圧接させ、もってミラー３を挟圧保持している。この形態例では、弾性固定部材６の一片６ｂがミラー３の一面と平行な姿勢となっているので、ミラー３の他面３ｂが接するミラー取付部２、２’の内周面（突起部５）と対向する位置を中心とした領域にずれ防止手段８を配置することにより、一片６ｂとミラーの一面３ａとの間の摩擦抵抗を増大せしめ、もって外力に起因したずれや脱落等を防止する。即ち、この形態例では、弾性固定部材６とミラー３とを平面で接触せしめ、かつミラー保持部材１の断面を含むようにずれ防止手段８を配置するので、後述する各形態例に比して、弾性固定部材６とミラー３との接触面が広くなる。このため、弾性固定部材６が、突起部５に作用する作用点に位置することとなり、確実に横ずれを防止することができる。
なお、この形態例に於て、ずれ防止手段８をミラー３の長手方向端部にまで延在させた場合、弾性固定部材６を圧入する時の作業性が悪くなるばかりか、圧入時に弾性固定部材６がずれ防止手段８の端縁をめくれさせ易くなるので、弾性固定部材６とミラー３とが面接触で押圧されなくなり、ズレ防止効果が半減してしまう。
従って、ずれ防止手段８の端縁は、図２に示す様に端縁の手前側適所で終端させるのが好ましい。
【０００８】
次に、図３の例では、弾性固定部材６の一片６ｂが湾曲しているので、ミラー３の一面３ａと一片６ｂとの接触する面積は狭くなっている。この形態例では、この接触領域にずれ防止手段８を介在させることにより、ミラー３と弾性固定部材６との間のすべりをなくし、強固な固定を実現している。
次に、図４の形態例では、弾性固定部材６の一片６ｂが、ミラー３の一面３ａと平行ではなく、一定の角度θを有して係合しているので、ずれ防止手段８を介在させる位置を、一片６ｂの先端部とミラーの長手方向端部との間の接近した領域にしている。この場合も、弾性固定部材６とミラー３との間の滑りと、それに起因したずれ、脱落を有効に防止するとともに、ミラー３を矢印Ａで示す押圧方向に確実に押圧することができるので、ミラーの保持力が必要十分となる。
【０００９】
なお、ずれ防止手段８としては、接着剤、両面テープ、ＥＴＰゴム等の高摩擦抵抗部材から成る板材、ポリエチレンフィルム等を使用することにより、ミラー３と弾性固定部材６との間の横ずれ防止をなくしたり、振動や衝撃でミラー３が破損したり脱落することを防止できる。
つまり、ずれ防止手段８を接着剤により構成する場合には、弾性固定部材６の一片６ｂとミラーの一面３ａとの間、つまり図２、図３、図４中に示したずれ防止手段８の存在領域内に接着剤を配置して固定を実現する。また、両面テープ、板材、フィルムを用いた場合にも同様である。なお、ずれ防止手段８として、接着剤、両面テープ、ＥＴＰゴム等の高摩擦抵抗部材から成る板材、ポリエチレンフィルム等を使用する場合には、図２の形態例の平面状の接触部にこれらを介在させることが有効であろう。
【００１０】
次に、図５はずれ防止手段を不適切に適用した場合の例を示す図であり、この例は、弾性固定部材６とミラー３との間にずれ防止手段８を配置しているのでは無く、ミラー保持部材１のミラー取付部２、２’の内周とミラー３との間にずれ防止手段を介在させている。このようにミラー取付部内周とミラー３とを直接ずれ防止手段８で固定させると、ミラー面の位置精度が悪くなるばかりか、接触面も突起部５との間の点接触になるため、振動や衝撃による横ずれを防止できない。特に、弾性固定部材６とミラー３との間の滑りは依然として解消されないこととなる。
従って、ずれ防止手段８の配置箇所としては、図２、図３、図４に示した位置が最適である。
【００１１】
【発明の効果】
請求項１のミラー保持装置においては、ミラーをミラー保持部材に設けたミラー取付部内に、弾性固定部材を用いて固定する際に、弾性固定部材とミラーとの接触部全体に渡って両者を固定する為のずれ防止手段を介在させているので、機械輸送時やスキャナー走査時の振動や衝撃によりミラーがミラー取付部からずれ落ちたり、横ずれしてミラー取付部内周縁に当り、ミラー端部が破損することを防止することができる。
請求項２、３、４のミラー保持装置においては、ずれ防止手段を、接着剤、両面粘着テープ、高摩擦抵抗部材等としているので、ミラー固定効果を高めることができる。特に、これらのずれ防止手段を、ミラーとミラー保持部材及びずれ防止手段が平面で接触し、押圧される位置（図２の形態例）に配置するように構成すれば、ミラーのズレがないようにすることができる。
請求項５のずれ防止手段においてはミラーの端部を回避した位置にミラーズレ防止手段を設けているので、ミラーと弾性部材との固定作業性の向上を図ることができる。また確実な効果が得られる。
【図面の簡単な説明】
【図１】本発明の弾性固定部材及びずれ防止手段の一例の構成を示す斜視図。
【図２】本発明の一例のミラー保持装置の保持状態説明図。
【図３】本発明の他の例のミラー保持装置の保持状態説明図。
【図４】本発明の他の例のミラー保持装置の保持状態説明図。
【図５】不適切な保持状態説明図。
【図６】（ａ）（ｂ）及び（ｃ）は従来例の説明図。
【図７】（ａ）（ｂ）は他の従来例の説明図。
【符号の説明】
１ミラー保持部材、２穴形状部、２’ 切欠き形状部、３ミラー、４段差、５突起部、６弾性固定部材、７溝、８ずれ防止手段。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming apparatus including an image reading apparatus including a light source and a mirror, such as a copying machine, a printer, and a plain paper facsimile apparatus, and more particularly to improvement of a holding device for a plane mirror constituting the image reading apparatus.
[0002]
[Prior art]
The image reading apparatus includes a light source for irradiating light on a document placed on contact glass, a mirror, a lens, and the like for guiding reflected light from the document surface in a predetermined direction. These optical components are normally supported by a holding member (running body), and there are various holding methods to prevent the optical components from being displaced or dropped due to vibration or impact caused by movement of the holding member. Consideration has been made.
A plurality of plane mirrors used in conventional scanning optical systems press the mirror surface with an elastic member in a state where the plane mirror is fitted in a predetermined mounting part of an aluminum die-cast holder or a pressed plate-shaped holding member. By doing so, it is positioned and fixed at a predetermined angle and position.
As such a holding member, in order to reduce the size and weight and reduce the cost, the both ends of the plane mirror are attached to the plate-like holding member formed by press processing without support by three-point support. What is fixed is known (Japanese Utility Model Publication No. 59-16884).
By the way, in recent years, it is required to reduce the size and weight of the image reading apparatus and the image forming apparatus and reduce the cost. As a result, it is necessary to reduce the size and weight of the components to the limit. However, the reduction in the area of the reflecting surface of the mirror is naturally limited due to requests based on functions such as exposure amount and exposure width, and cannot be made smaller than a certain size. Therefore, the holding member for holding the mirror has been changed from a conventional hole shape to a notch shape, thereby succeeding in downsizing without causing a function deterioration.
[0003]
6 (a), (b), (c) and FIGS. 7 (a) and 7 (b) are explanatory views showing the structure of a conventional flat mirror holding member, and FIG. 6 shows a case where the holding member has a hole shape. FIG. 7 shows a case where the holding member has a notch shape. In FIG. 6, reference numeral 1 denotes a mirror holding member. A hole shape portion 2 as a mirror mounting portion is formed on the plate surface of the mirror holding member 1, and a mirror is received on the inner periphery of each hole shape portion 2. The protrusion 5 and the step (recess) 4 that engages with the elastic fixing member 6 are formed in an opposing positional relationship. As shown in FIGS. 6A and 6B, the mirror 3 is inserted into the hole-shaped portion 2 at both ends in the longitudinal direction thereof, and then the elastic fixing member 6 is fitted into the stepped portion 4 so that the hole-shaped portion 2 is inserted. Fixed inside. The elastic fixing member 6 is formed by forming a metal plate or the like into a U shape or a V shape as shown in FIG. The end edges of both pieces 6a, 6b are bent about 90 degrees to prevent them from coming off. When the elastic fixing member 6 is press-fitted into the step 4, the engaging groove 7 is fitted to the opposing edges of the step 4 so that the elastic fixing member 6 is positioned.
[0004]
7 (a) and 7 (b) is a notch-shaped portion 2 ', and both sides of the mirror mounting portion are elastically fixed to the protrusion 5 in a state where the mirror 3 is inserted into the notch-shaped portion 27. The mirror is held by being pressed by the member 6.
As described above, in any type of conventional example, the elastic fixing member 6 is fixed to the holding member 1 by the engagement between the engaging groove 7 and the step 4, so that the mirror 3 is displaced with respect to vibration and impact. There is no. However, since the mirror 3 in FIG. 6 is only pressed and held by the elastic fixing member 6, the mirror 3 may be displaced in the direction of arrow A. When such a shift occurs, the hole-shaped portion 2 that is the mirror mounting portion There is a possibility that the end of the mirror 3 in contact with the inner periphery is damaged.
Further, in the case of the conventional example of FIG. 7, the mirror mounting portion is the notch-shaped portion 2 ′, so that the mirror 3 may drop off due to vibration or shock during machine transportation or the like, and the mirror 3 may fall off. is there.
In order to prevent such dropping and breakage, Japanese Patent Application Laid-Open No. 4-204910 (Patent No. 2514469) describes a state in which leaf springs are interposed on both sides of a mirror inserted into a hole-shaped mirror mounting portion. Although a technique has been disclosed in which the mirror is held under pressure, in this conventional example, the shape of the fixing member made of a leaf spring is complicated, and the workability and assemblability are deteriorated. It is not an effective holding means for the mirror holding unit.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above, and as a holding structure for holding a flat mirror constituting an optical system of an image reading apparatus, a mirror is fitted in a hole-shaped or notched-shaped mirror mounting portion. In the case of adopting a structure in which a leaf spring-like elastic fixing member is press-fitted into the mirror mounting part, it effectively prevents the mirror from falling off the mirror mounting part or causing displacement due to vibration and impact. It is an object of the present invention to provide a mirror holding device for an image reading apparatus.
It is another object of the present invention to provide a mirror holding device for an image reading apparatus that has a simple structure and good assembling workability, and that is inexpensive and has a reliable lateral shift prevention effect.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is a state in which a flat mirror end is fitted into a hole-shaped or notched-shaped mirror mounting portion formed in a plate-shaped mirror holding member. by press-fitting the plate spring-like elastic fixing member between the non-reflective surface and the inner peripheral surface of the mirror mounting portion, the mirror holding device for fixing while maintaining a constant positional accuracy of the mirror in the mirror mounting part, the One of the opposing inner peripheral surfaces of the mirror mounting portion is formed with a projection that contacts the reflecting surface of the mirror, and a recess is formed on the other inner peripheral surface. The leaf spring is bent into a U-shape or V-shape, and the leading edges of the first and second pieces extending in two directions from the bent portion are bent to prevent them from coming off, and the width direction of the first piece Engagement grooves that fit into opposite edges of the recess are opposed to both end edges A configuration in which form deviation of a between the second piece of the non-reflecting surface and the elastic fixing member of the mirror, in a region around the position opposed to the projections, the plane direction of the mirror It is characterized by interposing a slip prevention means for preventing the above. That is, according to the first aspect of the invention, the mirror is displaced or laterally displaced from the hole or notch due to vibration or impact during machine transportation or scanner scanning, and hits the end face of the hole and breaks the mirror end. There is no longer to do.
The invention of claim 2 is characterized in that the misregistration preventing means is an adhesive.
The invention of claim 3 is characterized in that the shift preventing means is a double-sided tape.
The invention of claim 4 is characterized in that the deviation preventing means is a high friction resistance member.
According to the second, third, and fourth aspects of the invention, it is possible to more reliably prevent the mirror and the elastic fixing member from being laterally displaced.
The invention according to claim 5 is characterized in that the deviation preventing means is configured to terminate at a near side position avoiding the longitudinal edge of the mirror.
According to the invention of claim 5, it is possible to improve the workability of fixing the mirror and the mirror holding member using the elastic fixing member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a mirror holding device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, while referring FIG. 6, FIG. 7 together, the same code | symbol is attached | subjected to the same part and the overlapping description is abbreviate | omitted.
As shown in FIGS. 6 and 7, a projection 5 is formed on one of the opposing inner peripheral surfaces of the mirror mounting portions 2 and 2 ′ so as to contact the reflecting surface 3b of the mirror 3, and the inner periphery A step (recess) 4 is formed on the other side of the surface. The elastic fixing member 6 is formed by bending a belt-shaped leaf spring into a U shape or a V shape, and bending each tip edge of the first and second pieces 6a and 6b extending in two directions from the bent portion to prevent the elastic fixing member 6 from coming off. In addition, a configuration is provided in which engaging grooves 7 that are fitted to opposite edges of the recess 4 are formed oppositely at both edges in the width direction of the first piece 6a.
FIG. 1 is a perspective view showing a characteristic configuration of the present invention. In the present invention, when the elastic fixing member 6 is press-fitted into the hole-shaped portion 2 or the notch-shaped portion 2 ′, the elastic fixing member 6 is shown in FIG. A plate-shaped displacement prevention means 8 made of a high friction resistance member (for example, an elastic material such as rubber or resin) having a large surface friction resistance is interposed at a position where the second piece 6b is in contact with the non-reflecting surface 3a of the mirror 3 . This is a characteristic point. That is, the shift in the mirror surface direction is prevented in a region between the non-reflecting surface 3a of the mirror 3 and the second piece 6b of the elastic fixing member 6 and centered on the position facing the protrusion 5. This is characterized in that a slip prevention means 8 is interposed.
First, FIG. 2 shows a first embodiment. In this embodiment, one mirror (second strip) 6b of the elastic fixing member 6 is applied to one surface 3a (non-reflecting surface) of the mirror 3 to obtain a mirror. The other surface (reflective surface) 3b of 3 is brought into pressure contact with a part of the inner peripheral edge of the hole-shaped portion 2 or the notch-shaped portion 2 ′, and the mirror 3 is held under pressure. In this embodiment, since one piece 6b of the elastic fixing member 6 is in a posture parallel to one surface of the mirror 3, the inner peripheral surface (projecting portion 5) of the mirror mounting portions 2, 2 ′ with which the other surface 3b of the mirror 3 contacts. ) Is disposed in a region centered on the position facing the other), thereby increasing the frictional resistance between the one piece 6b and the one surface 3a of the mirror, thereby preventing the displacement or dropout caused by the external force. . That is, in this embodiment, the elastic fixing member 6 and the mirror 3 are brought into contact with each other in a plane, and the displacement preventing means 8 is disposed so as to include the cross section of the mirror holding member 1. The contact surface between the elastic fixing member 6 and the mirror 3 becomes wider. For this reason, the elastic fixing member 6 will be located in the action point which acts on the projection part 5, and a lateral shift can be prevented reliably.
In this embodiment, when the slip prevention means 8 is extended to the end in the longitudinal direction of the mirror 3, not only the workability when the elastic fixing member 6 is press-fitted is deteriorated, but also the elastic fixing at the time of press-fitting. Since the member 6 can easily turn the edge of the shift preventing means 8, the elastic fixing member 6 and the mirror 3 are not pressed by surface contact, and the effect of preventing the shift is halved.
Therefore, it is preferable that the edge of the slip prevention means 8 is terminated at an appropriate position on the front side of the edge as shown in FIG.
[0008]
Next, in the example of FIG. 3, since the piece 6b of the elastic fixing member 6 is curved, the contact area between the one surface 3a of the mirror 3 and the piece 6b is narrow. In this embodiment, slipping between the mirror 3 and the elastic fixing member 6 is eliminated by interposing the slip prevention means 8 in this contact area, thereby realizing strong fixing.
Next, in the embodiment shown in FIG. 4, the piece 6b of the elastic fixing member 6 is not parallel to the one surface 3a of the mirror 3 but is engaged with a certain angle θ. The position to be made is a close area between the tip of the piece 6b and the longitudinal end of the mirror. In this case as well, slipping between the elastic fixing member 6 and the mirror 3, displacement due to it, and dropping off can be effectively prevented, and the mirror 3 can be reliably pressed in the pressing direction indicated by the arrow A. The holding power of the mirror becomes necessary and sufficient.
[0009]
In addition, as the slip prevention means 8, by using a plate material made of a high friction resistance member such as an adhesive, double-sided tape, ETP rubber, a polyethylene film, etc., the lateral slip prevention between the mirror 3 and the elastic fixing member 6 is prevented. It is possible to prevent the mirror 3 from being lost or damaged due to vibration or impact.
That is, when the slip prevention means 8 is formed of an adhesive, the slip prevention means 8 shown in FIGS. 2, 3 and 4 is provided between the piece 6b of the elastic fixing member 6 and the one surface 3a of the mirror. Fixing is achieved by placing an adhesive in the existing area. The same applies to the case where a double-sided tape, a plate material, or a film is used. In addition, when using the board | plate material which consists of high friction resistance members, such as an adhesive agent, a double-sided tape, ETP rubber | gum, a polyethylene film, etc. as a slip prevention means 8, these are attached to the planar contact part of the form example of FIG. It would be effective to intervene.
[0010]
Next, FIG. 5 is a diagram showing an example in which the deviation preventing means is improperly applied. In this example, the deviation preventing means 8 is not disposed between the elastic fixing member 6 and the mirror 3. In addition, a slip prevention means is interposed between the inner periphery of the mirror mounting portions 2, 2 ′ of the mirror holding member 1 and the mirror 3. When the inner periphery of the mirror mounting portion and the mirror 3 are fixed directly by the deviation preventing means 8, not only the positional accuracy of the mirror surface is deteriorated, but also the contact surface becomes a point contact with the protruding portion 5, so that vibration Cannot prevent lateral shift due to or impact. In particular, the slip between the elastic fixing member 6 and the mirror 3 is still not eliminated.
Therefore, the positions shown in FIG. 2, FIG. 3, and FIG.
[0011]
【The invention's effect】
In the mirror holding device according to claim 1, when the mirror is fixed in the mirror mounting portion provided on the mirror holding member using the elastic fixing member, both are fixed over the entire contact portion between the elastic fixing member and the mirror. As a means to prevent misalignment is included, the mirror may slip off the mirror mounting part due to vibration or shock during machine transportation or scanner scanning, or may be displaced laterally and hit the inner edge of the mirror mounting part, causing damage to the mirror end. Can be prevented.
In the mirror holding device according to the second, third, and fourth aspects, since the slip prevention means is an adhesive, a double-sided adhesive tape, a high friction resistance member, or the like, the mirror fixing effect can be enhanced. In particular, if these displacement prevention means are arranged in a position where the mirror, the mirror holding member and the displacement prevention means are in contact with each other and pressed (the embodiment shown in FIG. 2), there will be no mirror displacement. Can be.
In the shift prevention means of the fifth aspect, since the mirror displacement prevention means is provided at a position avoiding the end of the mirror, the workability of fixing the mirror and the elastic member can be improved. In addition, a certain effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of an example of an elastic fixing member and a slip prevention unit of the present invention.
FIG. 2 is an explanatory diagram of a holding state of a mirror holding device according to an example of the present invention.
FIG. 3 is an explanatory diagram of a holding state of a mirror holding device according to another example of the present invention.
FIG. 4 is an explanatory diagram of a holding state of a mirror holding device according to another example of the present invention.
FIG. 5 is an explanatory diagram of an inappropriate holding state.
FIGS. 6A, 6B, and 6C are explanatory diagrams of a conventional example.
7A and 7B are explanatory diagrams of another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mirror holding member, 2 hole shape part, 2 'notch shape part, 3 mirror, 4 level | step difference, 5 protrusion part, 6 elastic fixing member, 7 groove | channel, 8 deviation | shift prevention means.

Claims

Between the non-reflective surface of the mirror and the inner peripheral surface of the mirror mounting portion with the flat mirror end fitted in the hole-shaped or notched mirror mounting portion formed in the plate-shaped mirror holding member In the mirror holding device for fixing the mirror in the mirror mounting portion while ensuring a certain positional accuracy by press-fitting a leaf spring-like elastic fixing member to
One of the opposing inner peripheral surfaces of the mirror mounting portion is formed with a protrusion that contacts the reflective surface side of the mirror, and a recess is formed on the other of the inner peripheral surface,
The elastic fixing member bends the belt-shaped leaf spring into a U shape or a V shape, bends the leading edges of the first and second pieces extending in two directions from the bent portion, and prevents them from coming off. It has a configuration in which engagement grooves that are fitted to opposite edges of the recess are formed oppositely at both edges in the width direction of the first piece,
A shift between the non-reflecting surface of the mirror and the second piece of the elastic fixing member, in a region centering on a position facing the protrusion, to prevent the mirror from shifting in the surface direction. A mirror holding device for an image reading apparatus, characterized in that a prevention means is interposed.

2. The mirror holding device for an image reading apparatus according to claim 1, wherein the deviation preventing means is an adhesive.

2. The mirror holding device for an image reading apparatus according to claim 1, wherein the deviation preventing means is a double-sided tape.

2. A mirror holding device for an image reading apparatus according to claim 1, wherein said deviation preventing means is a high friction resistance member.

5. The image reading apparatus according to claim 1, wherein the deviation preventing means is disposed so as to terminate at a near side position avoiding a longitudinal edge of the mirror. Mirror holding device.