JPH02148116U

JPH02148116U -

Info

Publication number: JPH02148116U
Application number: JP5857789U
Authority: JP
Priority date: 1989-05-19
Filing date: 1989-05-19
Publication date: 1990-12-17

Description

[Brief explanation of the drawing]

第１図は本考案による象面湾曲補正装置の基本
構成例を示す図であつて、同図ａは象面湾曲補正
装置の概略構造を示す正面図、同図ｂはその側面
図である。第２図は本考案の実施例を示す象面湾
曲補正装置の正面図、第３図乃至第７図は本考案
の原理を説明するための図、第８図乃至第１１図
は本考案の前段技術を説明するための図である。１……積層型圧電アクチユエータ、２……ベー
ス部材、３……第１の変位拡大機構、３ａ，３ｂ
……変位部、４……第２の変位拡大機構、５……
コ字型状の保持部、ＣＬ……象面湾曲補正用シリ
ンドリカルレンズ、Ｒ……光軸。 FIG. 1 is a diagram showing an example of the basic configuration of an image plane curvature correction device according to the present invention, in which figure a is a front view showing a schematic structure of the image plane curvature correction device, and figure b is a side view thereof. Fig. 2 is a front view of an image plane curvature correction device showing an embodiment of the invention, Figs. 3 to 7 are diagrams for explaining the principle of the invention, and Figs. 8 to 11 are diagrams of the invention. FIG. 3 is a diagram for explaining the first-stage technique. DESCRIPTION OF SYMBOLS 1... Laminated piezoelectric actuator, 2... Base member, 3... First displacement magnification mechanism, 3a, 3b
...Displacement part, 4...Second displacement magnification mechanism, 5...
U-shaped holding part, CL...Cylindrical lens for correcting elephant curvature, R...Optical axis.

Claims

[Claims for Utility Model Registration] 1. A method for forming a substantially parallel light beam from a light source device as a long line image in a direction corresponding to the main scanning direction, and using a rotating polygon mirror having a deflection reflecting surface near the position where the line image is formed. In a scanning optical device that optically scans the surface to be scanned by deflecting the light beam and forming an image of the deflected light beam as a light spot on the surface to be scanned by an imaging optical system, the light beam is deflected by the deflection reflecting surface. A device for correcting field curvature in the main scanning direction or sub-scanning direction caused by the imaging optical system in synchronization with scanning, a cylindrical lens for correction disposed between a light source device and a rotating polygon mirror; and a displacement means for causing the cylindrical lens to perform a simple vibration in the optical axis direction in synchronization with optical scanning by the deflected light beam,
The displacement means includes a laminated piezoelectric actuator serving as a vibration source, a first displacement magnifying mechanism having displacement parts of two target structures that are symmetrically displaced in response to vibrations of the laminated piezoelectric actuator, and a plate-shaped elastic The cylindrical lens is held by a U-shaped holding part formed in the center, and the both ends are supported by both displacement parts of the first displacement amplification mechanism. a second displacement magnification mechanism that is elastically deformed by displacement of the displacement part and displaces the cylindrical lens in its optical axis direction, the first displacement magnification mechanism and the second displacement magnification mechanism being integrally molded with resin. A field curvature correction device in a scanning optical device, characterized in that it is configured by: 2. In the field curvature correction device in the scanning optical device according to claim 1, the first displacement magnification mechanism and the second
A field curvature correction device for a scanning optical device, characterized in that a displacement magnification mechanism and a displacement magnification mechanism are integrally molded from a reinforced fiber-containing thermoplastic resin.