公开(公告)号：US5493449A

公开(公告)日：1996-02-20

申请号：US294739

申请日：1994-08-23

申请人： Hiromitsu Yamakawa

发明人： Hiromitsu Yamakawa

IPC分类号： G02B9/36 ,  G02B13/24

CPC分类号： G02B13/24 ,  G02B9/36

摘要： An imagery lens system for image reading consists of first to fourth lens elements which are arranged in this order from the object side. The first and fourth lens elements respectively are double-convex lenses, and the second and third lens elements respectively are double-concave lenses. The following formulae are satisfied.0.35

摘要翻译： 用于图像读取的图像透镜系统由从物体侧依次排列的第一至第四透镜元件组成。 第一和第四透镜元件分别是双凸透镜，第二和第三透镜元件分别是双凹透镜。 满足以下公式。 0.35

公开(公告)号：US5343325A

公开(公告)日：1994-08-30

申请号：US954880

申请日：1992-09-30

申请人： Hiromitsu Yamakawa

发明人： Hiromitsu Yamakawa

IPC分类号： B41J2/44 ,  G02B13/00 ,  G02B13/18 ,  G02B26/12 ,  G02B27/00 ,  G02B26/08 ,  G02B9/04

CPC分类号： G02B27/0031 ,  G02B26/125

摘要： A compact scanning optical system for effecting a superior tilt surface correction and for reducing a field curvature. The system is provided with a focusing optical system which is composed of a first single lens and a second single lens, wherein the first single lens, with a positive refracting power in a plane of scan, has a toric surface from an image plane and the second single lens, with a negative refracting power in the scan plane, has an aspherical lens.

摘要翻译： 一种紧凑的扫描光学系统，用于实现优异的倾斜表面校正和减小场曲率。 该系统设置有由第一单透镜和第二单透镜组成的聚焦光学系统，其中在扫描平面中具有正折射率的第一单透镜具有来自图像平面的复曲面，并且 在扫描平面中具有负折射力的第二单透镜具有非球面透镜。

公开(公告)号：US4632520A

公开(公告)日：1986-12-30

申请号：US610435

申请日：1984-05-15

申请人： Hiromitsu Yamakawa

发明人： Hiromitsu Yamakawa

IPC分类号： G02B1/04 ,  G02B9/00 ,  G02B9/12 ,  G02B9/34 ,  G02B9/60 ,  G02B13/00 ,  G02B13/24 ,  G02B17/08

CPC分类号： G02B9/44 ,  G02B13/00 ,  G02B17/0856

摘要： A plastic objective lens system comprises at least one convex lens constituted of a plastic material exhibiting a relatively small absolute value of the coefficient of change in refractive index with temperature, and at least one concave lens constituted of a plastic material exhibiting an absolute value of the coefficient of change in refractive index with temperature, which is larger than the absolute value of the coefficient of the plastic material constituting the convex lens. A reflecting surface concave to the object and image side may be positioned at the rear of the convex lens and concave lens. The plastic objective lens system decreases fluctuation of the focal length and the conjugate distance due to a change in temperature while aberration is minimized.

摘要翻译： 塑料物镜系统包括至少一个凸透镜，该凸透镜由表现出相对较小的折射率与温度变化系数的绝对值相对较小的塑料材料构成，以及至少一个凹凸透镜，该透镜由表现出绝对值 折射率随温度变化的系数大于构成凸透镜的塑料材料的系数的绝对值。 对象物和像侧凹入的反射面可以位于凸透镜和凹透镜的后面。 塑料物镜系统由于温度变化而降低焦距的波动和共轭距离，同时使像差最小化。