JP2006091592A - Optical scanner and image forming apparatus - Google Patents

Optical scanner and image forming apparatus Download PDF

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JP2006091592A
JP2006091592A JP2004278528A JP2004278528A JP2006091592A JP 2006091592 A JP2006091592 A JP 2006091592A JP 2004278528 A JP2004278528 A JP 2004278528A JP 2004278528 A JP2004278528 A JP 2004278528A JP 2006091592 A JP2006091592 A JP 2006091592A
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imaging element
light
image forming
optical scanning
scanning device
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Yasuhiro Aritome
康弘 有留
Akio Hirano
彰士 平野
Hideki Konno
秀樹 今野
Jun Yoshida
準 吉田
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Ricoh Co Ltd
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Ricoh Co Ltd
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<P>PROBLEM TO BE SOLVED: To provide an optical scanner in which an image forming element is used in such image forming apparatus as a printer, a facsimile and a digital copying machine in which the imaging element is miniaturized, an easy forming shape which does not largely affect the image forming element is realized, the image forming element is easily and accurately positioned, the freedom of layout in designing is improved, and the cost is comparatively low, and to provide an image forming apparatus using the optical scanner. <P>SOLUTION: In the optical scanner in which luminous flux 8 emitted from a light source 1 is carried out conductor reflection on a deflector 2 which serves as a transmission body and a face to be scanned is optically scanned by using an image forming element 3, the image forming element 3 is located on the optical path of synchronized light and a passing port 6 forming the optical path for detecting the synchronized light is provided at a part other than the lens face of the image forming element 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、プリンタ、ファクシミリ、デジタル複写機等の画像形成装置において結像素子を使用する光走査装置、及びこれを使用する画像形成装置に関するものである。   The present invention relates to an optical scanning device using an imaging element in an image forming apparatus such as a printer, a facsimile machine, a digital copying machine, and the like, and an image forming apparatus using the same.

従来、光源から出射された光束が偏光器により反射され結像素子に入射したさい、結像素子に設けられた反射面により同期光を同期検知素子に戻すようにした光走査装置が知られている（例えば、特許文献１ないし８参照）。
特許文献１には、２枚以上の結像素子を有する光走査装置が開示されており、光源から出射された光束を偏光器により反射し、最初の素子を通過することにより光束が収束され、その収束された光束が２番目以降の結像素子端部に設けられた反射面により同期光を同期検知素子に戻すように構成されている。
特許文献２には、走査用レンズ、同期光検出装置及び１枚の結像素子を有する光走査装置が開示されており、光源から出射された光束を偏光器により反射し、その光束が結像素子端部に設けられた反射面により同期光を反射し、同期レンズを介し同期検知素子に戻すように構成されている。
特許文献３には、同期検知光学系及び１枚の結像素子を有する光走査装置が開示されており、光源から出射された光束を偏光器により反射し、その光束が結像素子端部に設けられた透過面により同期光を通過させ、同期レンズを介し同期検知素子に戻すように構成されている。 2. Description of the Related Art Conventionally, there is known an optical scanning device in which when a light beam emitted from a light source is reflected by a polarizer and is incident on an imaging element, synchronous light is returned to the synchronous detection element by a reflecting surface provided on the imaging element. (For example, see Patent Documents 1 to 8).
Patent Document 1 discloses an optical scanning device having two or more imaging elements, where a light beam emitted from a light source is reflected by a polarizer, and the light beam is converged by passing through the first element. The converged light beam is configured to return the synchronization light to the synchronization detection element by a reflection surface provided at the end of the second and subsequent imaging elements.
Patent Document 2 discloses an optical scanning device having a scanning lens, a synchronous light detection device, and a single imaging element. A light beam emitted from a light source is reflected by a polarizer, and the light beam is reflected by an imaging element. The synchronization light is reflected by the reflecting surface provided at the child end, and is returned to the synchronization detection element via the synchronization lens.
Patent Document 3 discloses an optical scanning device having a synchronous detection optical system and a single imaging element. A light beam emitted from a light source is reflected by a polarizer, and the light beam is reflected at the end of the imaging element. The synchronization light is allowed to pass through the provided transmission surface and returned to the synchronization detection element via the synchronization lens.

特許文献４には、１枚の結像素子を有する光走査装置が開示されており、光源から出射された光束を偏光器により反射し、その光束が干渉する結像素子端部をカットすることにより同期光を通過させ、同期レンズを介し同期検知素子に戻すように構成されている。
特許文献５には、光走査用レンズ及び１枚の結像素子を有する光走査装置が開示されており、光源から出射された光束を偏光器により反射し、その光束が結像素子端部に設けられた集光面により同期光を収束し、同期検知素子に入射するように構成されている。
特許文献６には、１枚の結像素子を有する光ビーム走査装置が開示されており、光源から出射された光束を偏光器により反射し、その光束が結像素子端部に設けられた反射面により同期光を反射し、同期レンズを介し同期検知素子に戻すように構成されている。
特許文献７及び８には、特許文献３の同期検知光学系と同様な光走査装置及び光走査装置用のレンズユニットを開示している。
特許文献１ないし３等に見られるように光源から出射された光束が偏光器により反射され結像素子に入射したさい、結像素子に設けられた反射面により同期光を同期検知素子に戻す方法が取られている。
特開平０９−１０１４７１号公報 特開平０９−２０３８７２号公報 特開平１０−１０４４５号公報 特開平１１−３１１７４９号公報 特開平０５−０５３０６７号公報 特開平０５−０９３８７７号公報 特開平０９−１９７３１７号公報 特許第２６９０６４２号 Patent Document 4 discloses an optical scanning device having a single imaging element, in which a light beam emitted from a light source is reflected by a polarizer and an end of an imaging element where the light beam interferes is cut. Thus, the synchronization light is allowed to pass through and returned to the synchronization detection element via the synchronization lens.
Patent Document 5 discloses an optical scanning device having an optical scanning lens and one imaging element. A light beam emitted from a light source is reflected by a polarizer, and the light beam is reflected at the end of the imaging element. The synchronization light is converged by the provided condensing surface and is incident on the synchronization detection element.
Patent Document 6 discloses a light beam scanning device having a single imaging element, in which a light beam emitted from a light source is reflected by a polarizer, and the light beam is reflected at the end of the imaging element. The sync light is reflected by the surface and returned to the sync detection element via the sync lens.
Patent Documents 7 and 8 disclose an optical scanning device similar to the synchronization detection optical system of Patent Document 3 and a lens unit for the optical scanning device.
As seen in Patent Documents 1 to 3, etc., when a light beam emitted from a light source is reflected by a polarizer and enters the imaging element, a method of returning the synchronizing light to the synchronization detecting element by a reflecting surface provided on the imaging element Has been taken.
Japanese Patent Laid-Open No. 09-101471 JP 09-203872 A Japanese Patent Laid-Open No. 10-10445 Japanese Patent Laid-Open No. 11-311749 JP 05-053067 A Japanese Patent Laid-Open No. 05-093877 JP 09-197317 A Japanese Patent No. 2690642

しかしながら、結像素子上に異なる形状の結像面を成形することは技術的課題が大きく、また周辺部におけるヒケやウネリの発生が結像素子の本来の目的とする被走査面上への光走査に影響することが懸念される。
また、特許文献１ないし３等に見られるように走査レンズと光センサ用レンズを一体化することにより、部品点数を削減することができ量産化も可能となるが、一体的に成形するには成形後の収縮、変形等を考慮しなければならず、金型設計や成形条件等で困難な問題が有り、また走査レンズ自体の精度が劣化するという問題もある。
そこで、本発明の目的は、上述した実情を考慮して、結像素子の小型化が図れ、結像素子に大きく影響することの無い容易な成形形状を実現し、また結像素子の位置決めを容易にかつ精度良くでき、設計でのレイアウトの自由度を向上させる比較的低コストの、プリンタ、ファクシミリ、デジタル複写機等の画像形成装置において結像素子を使用する光走査装置及びこれを使用する画像形成装置を提供することにある。 However, forming an imaging surface of a different shape on the imaging element has a great technical problem, and the occurrence of sink marks or undulations in the peripheral portion is the light on the surface to be scanned that is the original purpose of the imaging element. There is concern about affecting scanning.
Also, as can be seen in Patent Documents 1 to 3, etc., by integrating the scanning lens and the lens for the optical sensor, the number of parts can be reduced and mass production is possible. The shrinkage and deformation after molding must be taken into consideration, and there are difficult problems due to mold design and molding conditions, and there is also a problem that the accuracy of the scanning lens itself deteriorates.
Accordingly, an object of the present invention is to reduce the size of the imaging element in consideration of the above-described situation, to realize an easy molded shape that does not greatly affect the imaging element, and to position the imaging element. An optical scanning device that uses an imaging element in an image forming apparatus such as a printer, a facsimile machine, a digital copying machine, and the like, which can be easily and accurately performed, and which can improve the degree of freedom of layout in design, and the same, and the same An object is to provide an image forming apparatus.

上記の課題を解決するために、請求項１に記載の発明は、光源から出射され偏向器で反射された光束を、結像素子を使用して被走査面上で光走査させる光走査装置において、前記結像素子の光学面以外の部分に、同期光検知用の光束の光路となる同期光通過口を設けたことを特徴とする。
また、請求項２に記載の発明は、前記結像素子と同期光検知素子の間には集光用の同期レンズが配置されている請求項１記載の光走査装置を特徴とする。
また、請求項３に記載の発明は、前記結像素子のレンズ面以外の部分の前記通過口が、貫通した孔形状である請求項１又は２記載の光走査装置を特徴とする。
また、請求項４に記載の発明は、前記結像素子のレンズ面以外の部分の構造体の無い部位に、長孔形状部分が設けられる請求項１、２又は３記載の光走査装置を特徴とする。
また、請求項５に記載の発明は、前記結像素子がプラスチック成形されている請求項１ないし４のいずれか一項記載の光走査装置を特徴とする。
また、請求項６に記載の発明は、前記結像素子のレンズ面以外の部分に、断面形状がテーパ形状である孔が設けられる請求項１ないし５のいずれか一項記載の光走査装置を特徴とする。
また、請求項７に記載の発明は、請求項６記載の光走査装置を使用する画像形成装置を特徴とする。 In order to solve the above-mentioned problem, the invention described in claim 1 is an optical scanning device that optically scans a light beam emitted from a light source and reflected by a deflector on a surface to be scanned using an imaging element. In addition, a synchronization light passage opening serving as an optical path of a light beam for detecting synchronization light is provided in a portion other than the optical surface of the imaging element.
According to a second aspect of the present invention, there is provided the optical scanning device according to the first aspect, wherein a condensing synchronizing lens is disposed between the imaging element and the synchronizing light detecting element.
According to a third aspect of the present invention, there is provided the optical scanning device according to the first or second aspect, wherein the passage opening in a portion other than the lens surface of the imaging element has a penetrating hole shape.
According to a fourth aspect of the present invention, there is provided the optical scanning device according to the first, second, or third aspect, wherein a long hole-shaped portion is provided in a portion having no structure other than the lens surface of the imaging element. And
According to a fifth aspect of the present invention, there is provided the optical scanning device according to any one of the first to fourth aspects, wherein the imaging element is plastic molded.
According to a sixth aspect of the present invention, there is provided the optical scanning device according to any one of the first to fifth aspects, wherein a hole having a tapered cross section is provided in a portion other than the lens surface of the imaging element. Features.
According to a seventh aspect of the invention, there is provided an image forming apparatus using the optical scanning device according to the sixth aspect.

本発明によれば、偏光器により反射された光束の一部である同期光を同期光検知素子に入射させるために、結像素子レンズ面（光学面）以外の部分に設けた通過口を利用して通過させることで、結像素子に反射面や透過面を設ける必要が無くなり、比較的容易な成形方法で対応でき、結像素子単体のコスト低減に繋がる。
また同期レンズを設けることにより調整工数は必要になるが、装置レイアウトや結像素子形状に対応した同期レンズの取り付けが可能になるため、コンパクトな光走査装置を提供することが可能になる。 According to the present invention, a passage opening provided in a portion other than the imaging element lens surface (optical surface) is used to cause the synchronization light, which is a part of the light beam reflected by the polarizer, to enter the synchronization light detection element. Therefore, it is not necessary to provide a reflecting surface or a transmitting surface on the imaging element, and it can be handled by a relatively easy molding method, leading to a reduction in cost of the imaging element alone.
Further, the provision of the synchronization lens requires adjustment man-hours, but the synchronization lens corresponding to the device layout and the imaging element shape can be attached, so that a compact optical scanning device can be provided.

以下、図面を参照して、本発明の実施の形態を詳細に説明する。図１は本発明による光走査装置の実施の形態を示す概略図である。図１において、図示はしてないが画像形成装置に搭載されるこの光走査装置は光源１から出射された光束８を反射させる回転多面鏡としての偏光器２を有している。
光走査装置は、また、偏光器にて反射した光束が通過することにより収束され、被走査面９上を光走査することにより結像させる結像素子３を有し、光束がこの結像素子３の端部を通過するさいに被走査面９上の光走査直前に同期光の光束７を検出する同期光検知素子５と、同期光の光束７を収束する同期レンズ４と、を有している。
さらに、光走査装置の結像素子３の一端部には、同期光の光束７の干渉を防ぐために同期光用光路として結像素子３のレンズ面以外の部分に同期光通過口６が設けられている。
即ち、本発明は、光源１から出射され偏向器２で反射された光束を、結像素子３を使用して被走査面９上で光走査させる光走査装置において、結像素子３の光学面（レンズ面）以外の部分に、同期光検知用の光束１７の光路となる同期光通過口６を設けた構成が特徴的である。
光源１から出射された光束８を回転する偏光器２のミラー面にて反射させて結像素子３に照射し、この結像素子３内を通過した光束が素子特性により収束され、その収束された光束が被走査面９上を繰り返し光走査し、また被走査面９上の光走査開始点に収束した光束が到達する直前に、同期光の光束７を用いて同期光検知素子５により同期検知する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing an embodiment of an optical scanning device according to the present invention. In FIG. 1, although not shown, this optical scanning device mounted on an image forming apparatus has a polarizer 2 as a rotating polygon mirror that reflects a light beam 8 emitted from a light source 1.
The optical scanning device also has an imaging element 3 that converges when the light beam reflected by the polarizer passes and forms an image by optically scanning the surface to be scanned 9. A synchronizing light detecting element 5 for detecting the synchronizing light beam 7 immediately before the optical scanning on the surface 9 to be scanned, and a synchronizing lens 4 for converging the synchronizing light beam 7. ing.
Further, at one end portion of the imaging element 3 of the optical scanning device, a synchronizing light passage port 6 is provided at a portion other than the lens surface of the imaging element 3 as an optical path for the synchronizing light to prevent interference of the synchronizing light beam 7. ing.
That is, the present invention relates to an optical surface of the imaging element 3 in an optical scanning device that optically scans the light beam emitted from the light source 1 and reflected by the deflector 2 on the scanning surface 9 using the imaging element 3. A characteristic is that the synchronizing light passage port 6 serving as the optical path of the synchronizing light detecting light beam 17 is provided in a portion other than the (lens surface).
The light beam 8 emitted from the light source 1 is reflected by the mirror surface of the rotating polarizer 2 to irradiate the imaging element 3, and the light beam passing through the imaging element 3 is converged by the element characteristics and converged. The synchronized light beam is repeatedly scanned on the scanned surface 9 and is synchronized by the synchronizing light detecting element 5 using the synchronized light beam 7 immediately before the converged light beam reaches the light scanning start point on the scanned surface 9. Detect.

本発明では、光走査開始点の検知方法として、結像素子３のレンズ面以外の部分に同期光の光束７が通過可能な同期光通過口６を設けている。同期光の光束７はこの同期光通過口６に干渉すること無く通過し、結像素子３の同期光通過口６近傍に有る同期レンズ４を介して同期光検知素子５に入る。これによって同期光の光束７の同期検知を行なう同期光用光路を形成する。
本発明によれば、光源１から出射された光束８が偏光器２により反射される。この反射された光束が結像素子３により収束され、被走査面９上を光走査するさいの光走査開始点を検知する同期光の光路を結像素子３のレンズ面以外の部分に同期光通過口６として設ける。
そこを通過した同期光７が同期レンズ４を介し同期光検知素子５に入射されるので、結像素子３上に複雑な反射面や異なる形状の集光面を設ける必要が無く、さらに装置特性上の光束の干渉や形状の変更を行なうこと無く、所定の同期光検知素子５に光束を入射させることを可能とする。
ここで、結像素子３のレンズ面以外に設ける同期光通過口６の形状は、後述されるように、装置レイアウトや光路によって自由に設計して良い。
また、偏光器２で反射された同期光の光束７が結像素子３のレンズ面以外の部分に設けられた同期光の光路（同期光通過口）６を通過後、同期光検知素子５の入射に適した光束となるように、結像素子３と同期光検知素子５の間に光束収束のための同期レンズ４を配置する。
この同期レンズ４は入射面と出射面を備え、装置レイアウトや結像素子３の形状により同期レンズ５のパワー及び取り付け位置の変化が可能で、結像素子３のレンズ面以外の部分に設けられた同期光通過口６を介して出射される光束を受光し、同期光検知素子５に導く。
結像素子３の同期光通過口６の形状は従来の金型製作工法で容易に成形ができるので部品単体の低コスト化に結び付く。このさい、同期光通過口６を長穴形状とすることにより、偏光器２で反射され、結像素子３を通過した所定の入射角を持つ同期光の光束７と、結像素子３の構造部との干渉を防ぐことができる。 In the present invention, as a method for detecting the optical scanning start point, a synchronizing light passage port 6 through which the synchronizing light beam 7 can pass is provided in a portion other than the lens surface of the imaging element 3. The synchronizing light beam 7 passes without interfering with the synchronizing light passage port 6 and enters the synchronizing light detection element 5 through the synchronizing lens 4 in the vicinity of the synchronizing light passage port 6 of the imaging element 3. As a result, an optical path for synchronizing light for detecting the synchronization of the synchronizing light beam 7 is formed.
According to the present invention, the light beam 8 emitted from the light source 1 is reflected by the polarizer 2. The reflected light beam is converged by the imaging element 3, and the optical path of the synchronizing light for detecting the optical scanning start point when optically scanning the surface to be scanned 9 is synchronized with the portion other than the lens surface of the imaging element 3. It is provided as a passage port 6.
Since the synchronized light 7 passing there enters the synchronized light detecting element 5 via the synchronized lens 4, there is no need to provide a complicated reflecting surface or a condensing surface of a different shape on the image forming element 3, and the device characteristics are further improved. The light beam can be made incident on the predetermined synchronizing light detecting element 5 without interfering with the upper light beam or changing the shape.
Here, the shape of the synchronization light passage port 6 provided on a portion other than the lens surface of the imaging element 3 may be freely designed according to the apparatus layout and the optical path, as will be described later.
The synchronizing light beam 7 reflected by the polarizer 2 passes through the synchronizing light path (synchronizing light passage opening) 6 provided in a portion other than the lens surface of the imaging element 3, and then the synchronizing light detecting element 5. A synchronizing lens 4 for converging the light beam is disposed between the imaging element 3 and the synchronizing light detecting element 5 so that the light beam is suitable for incidence.
The synchronization lens 4 has an entrance surface and an exit surface, and the power and mounting position of the synchronization lens 5 can be changed depending on the apparatus layout and the shape of the imaging element 3. The synchronization lens 4 is provided on a portion other than the lens surface of the imaging element 3. The light beam emitted through the synchronized light passage port 6 is received and guided to the synchronized light detection element 5.
Since the shape of the synchronizing light passage port 6 of the imaging element 3 can be easily formed by a conventional mold manufacturing method, the cost of a single component is reduced. At this time, by forming the synchronization light passage opening 6 into an elongated hole shape, the synchronization light beam 7 having a predetermined incident angle reflected by the polarizer 2 and passed through the imaging element 3, and the structure of the imaging element 3. Interference with the part can be prevented.

図２は本発明による結合素子の第１の実施の形態を示す平面図である。図３は図２の結合素子の正面図である。図２及び図３において、結像素子３はプラスチック成形されている。
成形方法の一例としては、図示してないが、金型キャビティ内に円筒状のピンを設けることにより結像素子３のレンズ面以外の部分に貫通した円筒形状部分１０である同期光通過口６を生成する。
また、この場合に、金型キャビティ内に設けるピンは、キャビティ内に固定したピンでも良いし、成形品取り出し時にエジェクタピンとして使用する機構のピンでも良い。
図４は本発明による結合素子の第２の実施の形態を示す正面図である。図４には、同期光通過口６を形成する上述した長孔形状部分１１を有する結像素子３を示している。これによれば、偏光器２で反射され、結像素子３を通過した所定の入射角を持つ同期光の光束７と結像素子３の構造部との干渉を防ぐことができる。
図５は本発明による結合素子の第３の実施の形態を示す正面図である。図６は図５の線Ａ−Ａに沿う同期光通過口の断面図である。図５及び図６においては、テーパ形状部分１２を有する同期光通過口６を示している。結像素子３の成形時、金型のキャビティ内に配置するピン（図示せず）の先端側が小径、逆側が大径となるようにテーパ状に構成する。このテーパ状の通過口６は長穴状であってもよい。
これによって、結像素子３の成形時に発生し易いキャビティが取られることを防止でき、さらに同期光通過口６のピンを抜き取る動作時にかかる応力を低減し、その応力が影響する結像素子３のひずみや割れを防止できる。
また、テーパ形状の作成に関しては、テーパ形状に成形したピンを使用すれば良く、丸穴に比較しても成形性が向上する。 FIG. 2 is a plan view showing a first embodiment of a coupling element according to the present invention. FIG. 3 is a front view of the coupling element of FIG. 2 and 3, the imaging element 3 is plastic molded.
As an example of the molding method, although not shown, a synchronous light passage port 6 which is a cylindrical portion 10 penetrating a portion other than the lens surface of the imaging element 3 by providing a cylindrical pin in the mold cavity. Is generated.
In this case, the pin provided in the mold cavity may be a pin fixed in the cavity or a pin of a mechanism used as an ejector pin when taking out a molded product.
FIG. 4 is a front view showing a second embodiment of the coupling element according to the present invention. FIG. 4 shows the imaging element 3 having the above-described elongated hole-shaped portion 11 that forms the synchronization light passage opening 6. According to this, interference between the synchronous light beam 7 having a predetermined incident angle reflected by the polarizer 2 and passed through the imaging element 3 and the structure portion of the imaging element 3 can be prevented.
FIG. 5 is a front view showing a third embodiment of the coupling element according to the present invention. 6 is a cross-sectional view of the synchronous light passage opening along line AA in FIG. 5 and 6 show the synchronous light passage port 6 having the tapered portion 12. When the imaging element 3 is molded, the pin (not shown) arranged in the cavity of the mold is tapered so that the tip side has a small diameter and the opposite side has a large diameter. The tapered passage port 6 may have a long hole shape.
As a result, it is possible to prevent the occurrence of a cavity that is likely to occur when the imaging element 3 is molded. Further, the stress applied during the operation of extracting the pin of the synchronization light passage port 6 is reduced. Strain and cracking can be prevented.
Further, regarding the creation of the tapered shape, a pin molded into a tapered shape may be used, and the moldability is improved even when compared with a round hole.

本発明による光走査装置の実施の形態を示す概略図。1 is a schematic diagram showing an embodiment of an optical scanning device according to the present invention. 本発明による結合素子の第１の実施の形態を示す平面図。The top view which shows 1st Embodiment of the coupling element by this invention. 図２の結合素子の正面図。FIG. 3 is a front view of the coupling element of FIG. 2. 本発明による結合素子の第２の実施の形態を示す正面図。The front view which shows 2nd Embodiment of the coupling element by this invention. 本発明による結合素子の第３の実施の形態を示す正面図。The front view which shows 3rd Embodiment of the coupling element by this invention. 図５の線Ａ−Ａに沿う同期光通過口の断面図。FIG. 6 is a cross-sectional view of a synchronous light passage opening along line AA in FIG.

符号の説明Explanation of symbols

１ 光源
２ 偏光器
３ 結像素子
４ 同期レンズ
５ 同期光検知素子
６ 同期検知用の光路（同期光通過口）
７ 同期光の光束
８ 光源から放射される光束
９ 被走査面
１０ 円筒形状部分（同期光通過口）
１１ 長孔形状部分（同期光通過口）
１２ テーパ形状部分（同期光通過口）
DESCRIPTION OF SYMBOLS 1 Light source 2 Polarizer 3 Imaging element 4 Synchronous lens 5 Synchronous light detection element 6 Optical path for synchronous detection (synchronous light passage port)
7 Luminous flux of synchronous light 8 Luminous flux emitted from light source 9 Scanned surface 10 Cylindrical portion (synchronous light passage opening)
11 Slotted part (synchronous light passage port)
12 Tapered part (synchronous light passage)

Claims (7)

光源から出射され偏向器で反射された光束を、結像素子を使用して被走査面上で光走査させる光走査装置において、前記結像素子の光学面以外の部分に、同期光検知用の光束の光路となる同期光通過口を設けたことを特徴とする光走査装置。   In an optical scanning device that optically scans a light beam emitted from a light source and reflected by a deflector on a surface to be scanned using an imaging element, a portion for detecting synchronous light is provided on a portion other than the optical surface of the imaging element. An optical scanning device characterized in that a synchronous light passage serving as an optical path of a light beam is provided. 前記結像素子と前記同期光検知素子との間には集光用の同期レンズが配置されていることを特徴とする請求項１記載の光走査装置。   The optical scanning device according to claim 1, wherein a condensing synchronization lens is disposed between the imaging element and the synchronization light detection element. 前記結像素子の光学面以外の部分に設けた前記同期光通過口が、貫通した孔形状であることを特徴とする請求項１又は２に記載の光走査装置。   The optical scanning device according to claim 1, wherein the synchronization light passage opening provided in a portion other than the optical surface of the imaging element has a through hole shape. 前記結像素子の光学面以外の部分の構造体の無い部位に、長孔形状部分が設けられることを特徴とする請求項１、２又は３に記載の光走査装置。   4. The optical scanning device according to claim 1, wherein an elongated hole-shaped portion is provided in a portion where there is no structure other than the optical surface of the imaging element. 前記結像素子がプラスチック成形されていることを特徴とする請求項１乃至４の何れか一項に記載の光走査装置。   The optical scanning apparatus according to claim 1, wherein the imaging element is plastic-molded. 前記結像素子の光学面以外の部分に、断面形状がテーパ形状である孔が設けられることを特徴とする請求項１乃至５の何れか一項に記載の光走査装置。   6. The optical scanning device according to claim 1, wherein a hole having a tapered cross-sectional shape is provided in a portion other than the optical surface of the imaging element. 請求項６記載の光走査装置を使用することを特徴とする画像形成装置。

An image forming apparatus using the optical scanning device according to claim 6.

JP2004278528A 2004-09-24 2004-09-24 Optical scanner and image forming apparatus Pending JP2006091592A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002098921A (en) * 2000-07-17 2002-04-05 Canon Inc Optical scanner and image forming apparatus using the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002098921A (en) * 2000-07-17 2002-04-05 Canon Inc Optical scanner and image forming apparatus using the same

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