JPH0157714U

JPH0157714U -

Info

Publication number: JPH0157714U
Application number: JP15451187U
Authority: JP
Priority date: 1987-10-07
Filing date: 1987-10-07
Publication date: 1989-04-11

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す斜視図、第
２図は同上のものの一部の拡大平面図、第３図は
ばねの別の例を示す第２図と同様な図、第４図は
別の実施例を示す平面図、第５図は一般的な光走
査装置の原理を示すための図、第６図は偏光面と
垂直な方向に沿つた断面の展開図、第７図ａは２
枚レンズからなる第２結像光学系の偏光面内での
寸法を示す図、第７図ｂは同上のものの偏光面と
垂直な面内での寸法を示す図、第８図ａは３枚レ
ンズからなる第２結像光学系の偏光面内での寸法
を示す図、第８図ｂは同上のものの偏光面と垂直
な面内での寸法を示す図、第９〜１２図は収差、
像面湾曲およびｆθ特性を示す図、第１３図は像
面湾曲を示す図。１……光源、２……第１結像光学系、３……回
転多面鏡、４……反射面、５，６……第２結像光
学系、６……トーリツク面を有するレンズ、７…
…走査面。 Fig. 1 is a perspective view showing one embodiment of this invention, Fig. 2 is an enlarged plan view of a part of the same as above, Fig. 3 is a view similar to Fig. 2 showing another example of the spring, and Fig. 4 is a view similar to Fig. 2 showing another example of the spring. The figure is a plan view showing another embodiment, FIG. 5 is a diagram showing the principle of a general optical scanning device, FIG. 6 is a developed view of a cross section along the direction perpendicular to the plane of polarization, and FIG. 7 a is 2
A diagram showing the dimensions in the polarization plane of the second imaging optical system consisting of a single lens, Figure 7b is a diagram showing the dimensions in a plane perpendicular to the polarization plane of the same as above, and Figure 8a shows three lenses. A diagram showing the dimensions of the second imaging optical system consisting of a lens in the plane of polarization, FIG. 8b is a diagram showing the dimensions of the same as above in a plane perpendicular to the plane of polarization, and FIGS.
FIG. 13 is a diagram showing curvature of field and fθ characteristics; FIG. 13 is a diagram showing curvature of field; DESCRIPTION OF SYMBOLS 1... Light source, 2... First imaging optical system, 3... Rotating polygon mirror, 4... Reflective surface, 5, 6... Second imaging optical system, 6... Lens having a toric surface, 7 …
...scan plane.

Claims

[Scope of utility model registration request]

a light source section, a first imaging optical system that forms a linear image of the light beam emitted from the light source section, an optical deflector having a deflection reflection surface near the linear image formed by the first imaging optical system;
A scanned medium is scanned by a light beam deflected by the deflector, and the deflector is disposed between the scanned medium and the deflector, and forms an image of the deflected light beam on the scanned medium, and A lens including a single lens having at least a toric surface that maintains an optically substantially conjugate relationship between the deflection reflection surface of the deflector and the scanned medium in a plane perpendicular to the deflection plane of the light beam deflected by the deflector. 2
In an optical scanning device having an imaging optical system, a single lens having a toric surface of the second imaging optical system can be moved within the deflection plane in a direction perpendicular to the optical axis of the second imaging optical system. An optical scanning device characterized by: