JPH0651228A - Beam deflector - Google Patents

Beam deflector

Info

Publication number
JPH0651228A
JPH0651228A JP20764492A JP20764492A JPH0651228A JP H0651228 A JPH0651228 A JP H0651228A JP 20764492 A JP20764492 A JP 20764492A JP 20764492 A JP20764492 A JP 20764492A JP H0651228 A JPH0651228 A JP H0651228A
Authority
JP
Japan
Prior art keywords
polygon mirror
housing
resonance
optical deflector
mirror
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.)
Pending
Application number
JP20764492A
Other languages
Japanese (ja)
Inventor
Masaaki Yamada
山田  正明
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP20764492A priority Critical patent/JPH0651228A/en
Publication of JPH0651228A publication Critical patent/JPH0651228A/en
Pending legal-status Critical Current

Links

Landscapes

  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To reduce the noise of a beam deflector using a simple structure by forming integrally with a housing a resonance box whose resonance frequency is the same as the frequency of sounds caused by wind against a polygon mirror. CONSTITUTION:A cylindrical side wall 6 enclosing a polygon mirror 3 is provided on the outer peripheral portion of a drive motor 4 and a resonance box 9 whose bottom plate 7 located on the polygon mirror 3 has a through hole 8 formed at the center thereof is provided above the side wall 9. In a beam deflector 1, the drive motor 4 drives and rotates the polygon mirror 3 and thereby a laser beam is deflected and scanned at the reflecting surface 2 of the polygon mirror 3, and with such a flat polygon mirror 3 sounds are naturally caused by wind against it when the mirror 3 is rotated at high speeds, while the beam deflector 1 utilizes the resonance of the resonance box 9 and the internal loss of a housing 11 to reduce the sounds caused by wind against the polygon mirror 3, thereby reducing noise; i.e., the resonance box 9 of the beam deflector 1 has its resonance frequency set equal to the frequency of the sounds caused by wind against the polygon mirror 3.

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、レーザプリンタやバー
コードスキャナ等に利用される光偏向器に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical deflector used in laser printers, bar code scanners and the like.

【0002】[0002]

【従来の技術】現在、レーザプリンタやバーコードスキ
ャナ等でレーザ光を偏向走査するために利用している光
偏向器は、例えば、外周部に多数の反射面が連設された
円盤状の多面鏡を回転自在に軸支した構造などとなって
いる。ここで、このような光偏向器は、回転する多面鏡
の反射面に入射するレーザ光を偏向走査することができ
るが、扁平な多角柱状の多面鏡を高速回転させるために
必然的に発生する風切音が騒音となっている。
2. Description of the Related Art At present, an optical deflector used for deflecting and scanning a laser beam by a laser printer, a bar code scanner or the like is, for example, a disc-shaped multi-faced surface in which a large number of reflecting surfaces are continuously arranged on an outer peripheral portion. It has a structure in which a mirror is rotatably supported. Here, such an optical deflector can deflect and scan the laser light incident on the reflecting surface of the rotating polygonal mirror, but it is inevitably generated because the flat polygonal polygonal mirror is rotated at a high speed. Wind noise is noisy.

【0003】そこで、このような課題を解決するために
本出願人が特開平1-105907号公報に開示した光偏向器
は、多数の尖鋭なテーパ凹部を内面に形成したハウジン
グで多面鏡を密閉した構造となっている。このようにす
ることで、この光偏向器では、多面鏡が発生する風切音
はテーパ凹部内の吸音で減衰されるので、その騒音を低
減することができる。
Therefore, in order to solve such a problem, the optical deflector disclosed by the present applicant in Japanese Patent Application Laid-Open No. 1-105907 is such that a polygonal mirror is sealed by a housing having a large number of sharp tapered concave portions formed on the inner surface. It has a structure. By doing so, in this optical deflector, the wind noise generated by the polygon mirror is attenuated by the sound absorption in the taper recess, so that the noise can be reduced.

【0004】[0004]

【発明が解決しようとする課題】上記公報に開示された
光偏向器では、多面鏡を密閉するハウジングの内面に形
成した多数のテーパ凹部で風切音を吸音するようになっ
ている。
In the optical deflector disclosed in the above publication, wind noise is absorbed by a large number of tapered recesses formed on the inner surface of the housing that seals the polygonal mirror.

【0005】しかし、上述のように多数のテーパ凹部が
内面に形成されたハウジングを製作することは実際には
困難であり、その剛性も低下すると共に騒音の低減効果
も充分ではない。
However, it is actually difficult to manufacture a housing in which a large number of tapered recesses are formed on the inner surface as described above, the rigidity thereof is lowered, and the noise reduction effect is not sufficient.

【0006】[0006]

【課題を解決するための手段】請求項1記載の発明は、
外周部に多数の反射面が連設された多角柱状の多面鏡を
設け、この多面鏡を回転自在に軸支してハウジング内に
配置した光偏向器において、前記多面鏡の風切音の周波
数と共振周波数が同一の共鳴箱を前記ハウジングに一体
に形成した。
The invention according to claim 1 is
In an optical deflector having a polygonal polygonal polygonal mirror in which a number of reflecting surfaces are continuously provided on the outer peripheral portion and rotatably rotatably supporting the polygonal mirror in a housing, the frequency of the wind noise of the polygonal mirror. A resonance box having the same resonance frequency is formed integrally with the housing.

【0007】請求項2記載の発明は、請求項1記載の発
明において、多孔質プラスチックでハウジングを形成し
た。
According to a second aspect of the invention, in the first aspect of the invention, the housing is made of porous plastic.

【0008】請求項3記載の発明は、請求項1又は2記
載の発明において、所定の間隙を介して位置する二重壁
でハウジングを形成した。
According to a third aspect of the present invention, in the first or second aspect of the present invention, the housing is formed by a double wall positioned with a predetermined gap.

【0009】[0009]

【作用】請求項1記載の発明は、ハウジングと一体に形
成された共鳴箱が多面鏡の風切音を減衰することができ
るので、簡易な構造で光偏向器の騒音を良好に低減する
ことができる。
According to the invention described in claim 1, since the resonance box formed integrally with the housing can attenuate the wind noise of the polygon mirror, the noise of the optical deflector can be satisfactorily reduced with a simple structure. You can

【0010】請求項2記載の発明は、多孔質プラスチッ
クで形成されたハウジングは内部損失で多面鏡の風切音
を減衰することができるので、簡易な構造で光偏向器の
騒音を良好に低減することができる。
According to the second aspect of the present invention, since the housing made of porous plastic can attenuate the wind noise of the polygon mirror due to internal loss, the noise of the optical deflector can be satisfactorily reduced with a simple structure. can do.

【0011】請求項3記載の発明は、二重壁で形成され
たハウジングは二段階に多面鏡の風切音を減衰すること
ができるので、簡易な構造で光偏向器の騒音を良好に低
減することができる。
According to the third aspect of the present invention, the housing formed of the double wall can attenuate the wind noise of the polygon mirror in two steps. Therefore, the noise of the optical deflector can be satisfactorily reduced with a simple structure. can do.

【0012】[0012]

【実施例】請求項1及び2記載の発明の実施例を図1及
び図2に基づいて説明する。まず、この光偏向器1で
は、図1に例示するように、外周部に多数の反射面2が
連設された多角柱状の多面鏡3を設け、この多面鏡3が
駆動モータ4の回転軸5で回転自在に軸支されている。
そして、前記駆動モータ4の外周部には、前記多面鏡3
を包囲する円筒形の側壁6が設けられており、この側壁
6の上部には、前記多面鏡3上に位置する底板7の中心
に貫通孔8が形成された共鳴箱9が設けられている。こ
こで、この光偏向器1では、前記駆動モータ4と前記側
壁6と前記共鳴箱9とがボルトナット10で一体に締結
されてハウジング11を形成しており、このハウジング
11を形成する前記側壁6や前記共鳴箱9は、図2に例
示するように、内側の吸音層12内に多数の気泡13が
存在する多孔質プラスチックで形成されている。なお、
この光偏向器1では、前記側壁6の一部が透光板(図示
せず)で形成されており、この透光板を介して前記多面
鏡3の反射面2にレーザ光源と被走査面(共に図示せ
ず)とが対向するようになっている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claims 1 and 2 will be described with reference to FIGS. First, in this optical deflector 1, as shown in FIG. 1, a polygonal prism-shaped polygonal mirror 3 in which a large number of reflecting surfaces 2 are continuously provided on an outer peripheral portion is provided. 5 is rotatably supported.
The polygonal mirror 3 is provided on the outer peripheral portion of the drive motor 4.
Is provided with a cylindrical side wall 6, and a resonance box 9 in which a through hole 8 is formed at the center of a bottom plate 7 located on the polygon mirror 3 is provided above the side wall 6. . Here, in this optical deflector 1, the drive motor 4, the side wall 6, and the resonance box 9 are integrally fastened with a bolt nut 10 to form a housing 11, and the side wall forming the housing 11 is formed. 6 and the resonance box 9 are made of a porous plastic in which a large number of bubbles 13 are present in the sound absorbing layer 12 inside, as illustrated in FIG. In addition,
In this optical deflector 1, a part of the side wall 6 is formed of a light-transmitting plate (not shown), and a laser light source and a surface to be scanned are formed on the reflecting surface 2 of the polygon mirror 3 via the light-transmitting plate. (Both are not shown).

【0013】このような構成において、この光偏向器1
では、駆動モータ4が多面鏡3を回転駆動するので、こ
の多面鏡3の反射面2でレーザ光が偏向走査されること
になる。そして、このように扁平な多角柱状の多面鏡3
は高速回転する際に必然的に風切音を発生するが、この
光偏向器1では、共鳴箱9の共鳴とハウジング11の内
部損失とで多面鏡3の風切音を減衰して騒音を軽減する
ようになっている。このようにすることで、この光偏向
器1では、簡易な構造でハウジング11の剛性を低下さ
せることなく効果的に騒音を軽減することができる。
In such a structure, the optical deflector 1
Then, since the drive motor 4 rotationally drives the polygon mirror 3, the reflecting surface 2 of the polygon mirror 3 deflects and scans the laser light. Then, the polygonal polygonal mirror 3 having such a flat polygonal column shape
Generates a wind noise when it rotates at a high speed, but in this optical deflector 1, resonance of the resonance box 9 and internal loss of the housing 11 attenuate the wind noise of the polygon mirror 3 to generate noise. It is designed to reduce. By doing so, the optical deflector 1 can effectively reduce noise without lowering the rigidity of the housing 11 with a simple structure.

【0014】ここで、この光偏向器1の共鳴箱9は、そ
の共振周波数に近接した周波数帯域の音波を共鳴エネル
ギに変換することで減衰するので、その共振周波数が多
面鏡3の風切音の周波数と同等になるように設定してお
くことで、この多面鏡3の風切音を吸音することができ
る。より具体的には、この共鳴箱9の底板7の貫通孔8
の半径をa(cm)、その面積をS(cm2)、底板7の板厚を
d(cm)、内容積をV(cm3)、音速をC(m/s)とすると、
その共振周波数f(Hz)は、 f=(C/2π)√(S/ιV) ι=d+1.57a となる。そこで、平面形状が六角形の多面鏡3の回転速
度が10000(rpm)ならば風切音の周波数は1000(Hz)となる
ので、例えば、貫通孔8の半径a=0.2(cm)、底板7の
板厚d=0.3(cm)、内容積V=6.3(cm3)、音速C=340
(m/s)とすると、共鳴箱9の共振周波数f=1000(Hz)と
なる。
The resonance box 9 of the optical deflector 1 is attenuated by converting sound waves in a frequency band close to the resonance frequency into resonance energy, so that the resonance frequency is the wind noise of the polygon mirror 3. The wind noise of the polygonal mirror 3 can be absorbed by setting the frequency to be equal to the frequency. More specifically, the through hole 8 of the bottom plate 7 of the resonance box 9
Let a be the radius of a (cm), its area be S (cm 2 ), the thickness of the bottom plate 7 be d (cm), the internal volume be V (cm 3 ), and the sound velocity be C (m / s).
The resonance frequency f (Hz) is f = (C / 2π) √ (S / ιV) ι = d + 1.57a. Therefore, if the rotation speed of the polygonal mirror 3 having a hexagonal planar shape is 10000 (rpm), the frequency of wind noise is 1000 (Hz). Therefore, for example, the radius a of the through hole 8 is 0.2 (cm), 7 thickness d = 0.3 (cm), internal volume V = 6.3 (cm 3 ), sound velocity C = 340
(m / s), the resonance frequency of the resonance box 9 is f = 1000 (Hz).

【0015】また、この光偏向器1では、ハウジング1
1を形成した多孔質プラスチックが気泡13内の空気の
振動や摩擦等で物性的に音波を減衰するので、やはり多
面鏡3の風切音を吸音するようになっている。
Further, in this optical deflector 1, the housing 1
Since the porous plastic forming the element 1 physically attenuates the sound wave due to vibration and friction of the air in the bubble 13, the wind noise of the polygon mirror 3 is also absorbed.

【0016】つぎに、請求項1ないし3記載の発明の実
施例を図3に基づいて説明する。まず、この光偏向器1
4では、多面鏡3の外周に位置するハウジング15が所
定の間隙を介して位置する二重の側壁16,17で形成
されており、さらに、ここでは内側の側壁16に貫通孔
18が形成されることで共鳴箱19が形成されている。
なお、この光偏向器14では、前記ハウジング15の一
部が透光板20で形成されており、この透光板20を介
して前記多面鏡3の反射面2にレーザ光源と被走査面
(共に図示せず)とが対向するようになっている。ま
た、この光偏向器14でも、前記ハウジング15は多孔
質プラスチックで形成されている。
Next, an embodiment of the invention described in claims 1 to 3 will be described with reference to FIG. First, this optical deflector 1
4, the housing 15 located on the outer periphery of the polygonal mirror 3 is formed of double side walls 16 and 17 located with a predetermined gap, and the through hole 18 is formed in the inner side wall 16 here. As a result, the resonance box 19 is formed.
In the light deflector 14, a part of the housing 15 is formed by a light transmitting plate 20, and the laser light source and the surface to be scanned (on the reflecting surface 2 of the polygon mirror 3 via the light transmitting plate 20). (Both are not shown). Further, also in the optical deflector 14, the housing 15 is made of porous plastic.

【0017】このような構成において、この光偏向器1
4では、多面鏡3を外周から包囲する側壁16,17が
二重となっているので、これらの側壁16,17が多面
鏡3の風切音を二段階に減衰して騒音を軽減するように
なっている。しかも、この光偏向器14では、上述のよ
うな二重の側壁16,17が共鳴箱19を形成してお
り、ハウジング15が多孔質プラスチックで形成されて
いるので、この共鳴箱19の共鳴とハウジング15の内
部損失とでも多面鏡3の風切音を減衰して騒音を軽減す
るようになっている。
In such a structure, the optical deflector 1
In Fig. 4, since the side walls 16 and 17 that surround the polygonal mirror 3 from the outer periphery are doubled, these side walls 16 and 17 attenuate the wind noise of the polygonal mirror 3 in two stages to reduce the noise. It has become. Moreover, in the optical deflector 14, since the double side walls 16 and 17 as described above form the resonance box 19 and the housing 15 is made of porous plastic, the resonance of the resonance box 19 is suppressed. With the internal loss of the housing 15, the wind noise of the polygon mirror 3 is attenuated to reduce the noise.

【0018】[0018]

【発明の効果】請求項1記載の発明は、外周部に多数の
反射面が連設された多角柱状の多面鏡を設け、この多面
鏡を回転自在に軸支してハウジング内に配置した光偏向
器において、前記多面鏡の風切音の周波数と共振周波数
が同一の共鳴箱を前記ハウジングに一体に形成したこと
により、このハウジングと一体に形成された共鳴箱が多
面鏡の風切音を減衰することができるので、簡易な構造
で光偏向器の騒音を良好に低減することができる等の効
果を有するものである。
According to the first aspect of the invention, a polygonal polygonal polygonal mirror having a large number of reflecting surfaces continuously provided on the outer peripheral portion thereof is provided, and the polygonal polygonal mirror is rotatably rotatably supported in the housing. In the deflector, the resonance box having the same resonance frequency as the wind noise of the polygon mirror is integrally formed in the housing, so that the resonance box integrally formed with the housing causes the wind noise of the polygon mirror. Since the light can be attenuated, the noise of the optical deflector can be satisfactorily reduced with a simple structure.

【0019】請求項2記載の発明は、請求項1記載の発
明において、多孔質プラスチックでハウジングを形成し
たことにより、このハウジングは内部損失で多面鏡の風
切音を減衰することができるので、簡易な構造で光偏向
器の騒音を良好に低減することができる等の効果を有す
るものである。
According to a second aspect of the invention, in the first aspect of the invention, since the housing is formed of porous plastic, the housing can attenuate the wind noise of the polygon mirror due to internal loss. With a simple structure, it is possible to effectively reduce the noise of the optical deflector.

【0020】請求項3記載の発明は、請求項1又は2記
載の発明において、所定の間隙を介して位置する二重壁
でハウジングを形成したことにより、このハウジングは
二段階に多面鏡の風切音を減衰することができるので、
簡易な構造で光偏向器の騒音を良好に低減することがで
きる等の効果を有するものである。
According to a third aspect of the present invention, in the first or second aspect of the present invention, the housing is formed by a double wall positioned with a predetermined gap, so that the housing has two stages of wind of a polygon mirror. Since the cutting noise can be attenuated,
With a simple structure, it is possible to effectively reduce the noise of the optical deflector.

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

【図1】請求項1及び2記載の発明の実施例を示す縦断
側面図である。
FIG. 1 is a vertical cross-sectional side view showing an embodiment of the invention described in claims 1 and 2.

【図2】ハウジングを示す縦断側面図である。FIG. 2 is a vertical side view showing a housing.

【図3】請求項1ないし3記載の発明の実施例を示す横
断平面図である。
FIG. 3 is a cross-sectional plan view showing an embodiment of the invention described in claims 1 to 3.

【符号の説明】[Explanation of symbols]

1,14 光偏向器 2 反射面 3 多面鏡 9,19 共鳴箱 11,15 ハウジング 1,14 Optical deflector 2 Reflective surface 3 Polyhedral mirror 9,19 Resonance box 11,15 Housing

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 外周部に多数の反射面が連設された多角
柱状の多面鏡を設け、この多面鏡を回転自在に軸支して
ハウジング内に配置した光偏向器において、前記多面鏡
の風切音の周波数と共振周波数が同一の共鳴箱を前記ハ
ウジングに一体に形成したことを特徴とする光偏向器。
1. An optical deflector in which a polygonal prism-shaped polygonal mirror having a large number of reflecting surfaces continuously provided on an outer periphery thereof is provided, and the polygonal mirror is rotatably supported and arranged in a housing. An optical deflector, characterized in that a resonance box having the same resonance frequency as the wind noise is formed integrally with the housing.
【請求項2】 多孔質プラスチックでハウジングを形成
したことを特徴とする請求項1記載の光偏向器。
2. The optical deflector according to claim 1, wherein the housing is made of porous plastic.
【請求項3】 所定の間隙を介して位置する二重壁でハ
ウジングを形成したことを特徴とする請求項1又は2記
載の光偏向器。
3. The optical deflector according to claim 1, wherein the housing is formed by a double wall positioned with a predetermined gap.
JP20764492A 1992-08-04 1992-08-04 Beam deflector Pending JPH0651228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20764492A JPH0651228A (en) 1992-08-04 1992-08-04 Beam deflector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20764492A JPH0651228A (en) 1992-08-04 1992-08-04 Beam deflector

Publications (1)

Publication Number Publication Date
JPH0651228A true JPH0651228A (en) 1994-02-25

Family

ID=16543197

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20764492A Pending JPH0651228A (en) 1992-08-04 1992-08-04 Beam deflector

Country Status (1)

Country Link
JP (1) JPH0651228A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8199391B2 (en) * 2005-09-13 2012-06-12 Canon Kabushiki Kaisha Optical scanning apparatus having an air path for airflow generated by a rotating mirror
US9298121B2 (en) 2014-05-26 2016-03-29 Ricoh Company, Limited Optical scanning device and image forming apparatus
US9360790B2 (en) 2014-05-13 2016-06-07 Ricoh Company, Limited Optical scanning device and image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8199391B2 (en) * 2005-09-13 2012-06-12 Canon Kabushiki Kaisha Optical scanning apparatus having an air path for airflow generated by a rotating mirror
US9360790B2 (en) 2014-05-13 2016-06-07 Ricoh Company, Limited Optical scanning device and image forming apparatus
US9298121B2 (en) 2014-05-26 2016-03-29 Ricoh Company, Limited Optical scanning device and image forming apparatus
US9471028B2 (en) 2014-05-26 2016-10-18 Ricoh Company, Limited Optical scanning device and image forming apparatus

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