JP2016194675A5

JP2016194675A5 -

Info

Publication number: JP2016194675A5
Application number: JP2016030654A
Authority: JP
Filing date: 2016-02-22
Publication date: 2019-02-28
Anticipated expiration: 2036-02-22

Description

そこで、本発明に係る光走査装置は、光束を偏向して被走査面を主走査方向に走査する偏向器と、偏向器によって偏向された光束を被走査面に導光する結像光学素子とを備え、結像光学素子のｆθ係数をｆ_θ、結像光学素子の焦点距離をｆ_ｓ、偏向器と軸上光束の主光線との交点を原点としたときの、軸上光束の主光線と結像光学素子の入射面及び出射面との交点の光軸方向における座標を各々Ｘ _１０及びＸ _２０、最軸外光束の主光線と結像光学素子の入射面及び出射面との交点の光軸方向における座標を各々Ｘ _１ｍａｘ及びＸ _２ｍａｘとするとき、
０．６５＜ｆ_θ／ｆ_ｓ＜１．００
０．３０＜（Ｘ_１ｍａｘ−Ｘ_１０）／（Ｘ_２０−Ｘ_１０）＜０．４９
−０．２４＜（Ｘ_２ｍａｘ−Ｘ_２０）／（Ｘ_２０−Ｘ_１０）＜−０．０６
なる条件式を満たすことを特徴とする。 Therefore, the optical scanning apparatus according to the present invention, a deflector for査run the scan surface in the main scanning direction to deflect a light beam, imaging optics for guiding the light beam deflected by the deflector on a surface to be scanned with the door, the fθ coefficient of the imaging optical element f _theta, focal length f _s of the imaging optical _element, when the origin of the intersection of the principal ray of the deflector and axial rays, the main on-axis light flux intersection of the ray and imaging each coordinate in the optical axis direction of the intersection between the entrance surface and the exit surface of the optical element X ₁₀ and X _20, the entrance surface and the exit surface of the principal ray and the imaging optical element of the most off-axis light flux When the coordinates in the optical axis direction are X _1max and X _2max , respectively,
0.65 <f _θ / f _s <1.00
_{_{_{0.30 <(X 1max -X 10)}}} / (X 20 -X 10) <0.49
−0.24 <(X _2max −X ₂₀ ) / (X ₂₀ −X ₁₀ ) <− 0.06
The following conditional expression is satisfied.

ｆ_θは、光走査装置１００の走査光学系のｆθ係数、ｆ_ｓは、光走査装置１００の走査光学系の焦点距離である。
Ｘ_１ｍａｘ、Ｘ_２ｍａｘ、Ｘ_１０及びＸ_２０は、図２に示されている座標である。すなわち、Ｘ_１ｍａｘ（ｍｍ）は、主走査方向における最軸外像高に到達する光束（最軸外光束）の主光線と、走査レンズ５の偏向器４側の光学面（入射面）との交点の光軸方向での座標である。Ｘ_２ｍａｘ（ｍｍ）は、最軸外光束の主光線と、走査レンズ５の被走査面６側の光学面（出射面）との交点の光軸方向での座標である。Ｘ_１０（ｍｍ）は、軸上像高に到達する光束（軸上光束）の主光線と、走査レンズ５の偏向器４側の光学面との交点の光軸方向での座標である。Ｘ_２０（ｍｍ）は、軸上光束の主光線と、走査レンズ５の被走査面６側の光学面との交点の光軸方向での座標である。なお、ここで原点は、偏向器４と軸上光束の主光線とが交わる点である。 f _θ is the fθ coefficient of the scanning optical system of the optical scanning device 100, and f _s is the focal length of the scanning optical system of the optical scanning device 100.
X _1max , X _2max , X ₁₀ and X ₂₀ are the coordinates shown in FIG. That is, X _1max (mm) is the principal ray of the light beam (the most off-axis light beam) reaching the most off-axis image height in the main scanning direction and the optical surface (incident surface) on the deflector 4 side of the scanning lens 5 . It is a coordinate in the optical axis direction of the intersection . X _2max (mm) is a coordinate in the optical axis direction of the intersection of the principal ray of the most off-axis light beam and the optical surface (exit surface) on the scanning surface 6 side of the scanning lens 5. X ₁₀ (mm) is the coordinate in the optical axis direction of the intersection of the principal ray of the light beam (axial light beam) reaching the axial image height and the optical surface on the deflector 4 side of the scanning lens 5. X ₂₀ (mm) is the coordinate in the optical axis direction of the intersection of the principal ray of the axial light beam and the optical surface on the scanning surface 6 side of the scanning lens 5. Here, the origin is the point where the deflector 4 and the principal ray of the axial light beam intersect.

Claims

光束を偏向して被走査面を主走査方向に走査する偏向器と、該偏向器によって偏向された光束を前記被走査面に導光する結像光学素子とを備える光走査装置であって、
前記結像光学素子のｆθ係数をｆ_θ、前記結像光学素子の焦点距離をｆ_ｓ、前記偏向器と軸上光束の主光線との交点を原点としたときの、該軸上光束の主光線と前記結像光学素子の入射面及び出射面との交点の光軸方向における座標を各々Ｘ _１０及びＸ _２０、最軸外光束の主光線と前記入射面及び前記出射面との交点の光軸方向における座標を各々Ｘ _１ｍａｘ及びＸ _２ｍａｘとするとき、
０．６５＜ｆ_θ／ｆ_ｓ＜１．００
０．３０＜（Ｘ_１ｍａｘ−Ｘ_１０）／（Ｘ_２０−Ｘ_１０）＜０．４９
−０．２４＜（Ｘ_２ｍａｘ−Ｘ_２０）／（Ｘ_２０−Ｘ_１０）＜−０．０６
なる条件式を満たすことを特徴とする光走査装置。 An optical scanning apparatus comprising a deflector for査run the scan surface in the main scanning direction to deflect the light beam, and an imaging optical element for guiding the light beam deflected by said deflector on the surface to be scanned ,
The fθ coefficient of said imaging optical element f _theta, focal length f _s of said imaging optical _element, when the origin of the intersection of the principal ray of the deflector and the axis light beam, of the shaft light flux mainly each coordinate in the optical axis direction of the intersection of the ray and the incident surface and the exit surface of said imaging optical element X ₁₀ and X _20, the light of intersection of the chief ray and the incident surface and the exit surface of the outermost off-axis light beam When the coordinates in the axial direction are X _1max and X _2max , respectively,
0.65 <f _θ / f _s <1.00
_{_{_{0.30 <(X 1max -X 10)}}} / (X 20 -X 10) <0.49
−0.24 <(X _2max −X ₂₀ ) / (X ₂₀ −X ₁₀ ) <− 0.06
An optical scanning device characterized by satisfying the following conditional expression:

前記結像光学素子の光軸上において、前記原点から前記出射面までの距離をＴ２、前記出射面から前記被走査面までの距離をＳｋとするとき、
０．２０≦Ｔ２／Ｓｋ≦０．３０
なる条件式を満たすことを特徴とする請求項１に記載の光走査装置。 When the distance from the origin to the exit surface on the optical axis of the imaging optical element is T2, and the distance from the exit surface to the scanned surface is Sk,
0.20 ≦ T2 / Sk ≦ 0.30
The optical scanning device according to claim 1, wherein the following conditional expression is satisfied.

前記結像光学素子の光軸上における肉厚をｄとするとき、
０．０５≦ｄ／ｆ_θ≦０．０８
なる条件式を満たすことを特徴とする請求項１又は２に記載の光走査装置。 When the thickness on the optical axis of the imaging optical element is d,
0.05 ≦ d / f _θ ≦ 0.08
The optical scanning device according to claim 1, wherein the following conditional expression is satisfied.

前記結像光学素子の副走査断面内における近軸横倍率をβｓとするとき、
３．０＜｜βｓ｜＜４．０
なる条件式を満たすことを特徴とする請求項１乃至３の何れか一項に記載の光走査装置。 When the paraxial lateral magnification in the sub-scan section of the imaging optical element is βs,
3.0 <| βs | <4.0
The optical scanning device according to any one of claims 1 to 3, characterized by satisfying the conditional expression composed.

請求項１乃至４の何れか一項に記載の光走査装置と、該光走査装置によって前記被走査面に形成される静電潜像をトナー像として現像する現像器と、現像された前記トナー像を被転写材に転写する転写器と、転写された前記トナー像を前記被転写材に定着させる定着器とを備えることを特徴とする画像形成装置。 An optical scanning apparatus according to any one of claims 1 to 4, a developing device for developing an electrostatic latent image formed on the surface to be scanned by the optical scanning apparatus as a toner image, the toner developed an image forming apparatus comprising: a transferring device for transferring an image onto a transfer material, and a fixing device for fixing the in the transfer material the toner image transferred.

請求項１乃至４の何れか一項に記載の光走査装置と、
外部機器から出力されたコードデータを画像信号に変換して前記光走査装置に入力するプリンタコントローラとを備えることを特徴とする画像形成装置。 An optical scanning device according to any one of claims 1 to 4,
Image forming apparatus characterized by converting the code data outputted from an external device into an image signal and a printer controller to be input to the optical scanning device.