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Scanning optical system

Imported: 23 Feb '17 | Published: 22 Oct '02

Nobuo Mushiake, Shigeru Sawamura, Shunta Takimoto

USPTO - Utility Patents

Abstract

A scanning optical system is used to re-form an original image on a CCD line sensor. The optical system has an object side lens unit, a mirror and an image side lens unit. The object side lens unit condenses light from the object. The mirror is arranged between the object side lens to deflect the light having passed through the object side lens unit for scanning. An exit pupil of the object side lens unit coincide with an entrance pupil of the image side lens unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

This and other objects and features of this invention will become clear from the following description, taken in conjunction with the preferred embodiments with reference to the accompanied drawings in which:

FIG. 1 is a perspective view schematically showing a basic arrangement of first to fifth embodiments of the present invention;

FIG. 2 is a view of assistance in explaining the relationship between the image plane and the projection methods of an object side lens unit in the embodiments of FIG. 1;

FIG. 3 shows the lens arrangement of the first embodiment at a mirror rotation angle of 45 degrees;

FIG. 4 shows the lens arrangement of the first embodiment at a mirror rotation angle of 48.5 degrees;

FIG. 5 shows the lens arrangement of the first embodiment at a mirror rotation angle of 41.5 degrees;

FIG. 6 shows the lens arrangement of the second embodiment at a mirror rotation angle of 45 degrees;

FIG. 7 shows the lens arrangement of the second embodiment at a mirror rotation angle of 48.5 degrees;

FIG. 8 shows the lens arrangement of the second embodiment at a mirror rotation angle of 41.5 degrees;

FIG. 9 shows the lens arrangement of the third embodiment at a mirror rotation angle of 45 degrees;

FIG. 10 shows the lens arrangement of the third embodiment at a mirror rotation angle of 48.5 degrees;

FIG. 11 shows the lens arrangement of the third embodiment at a mirror rotation angle of 41.5 degrees;

FIG. 12 is a cross-sectional view in the sub scanning direction showing the lens arrangement of the fourth embodiment at a high magnification condition and at a low magnification condition;

FIG. 13 is a cross-sectional view in the main scanning direction showing the lens arrangement of the fifth embodiment at a mirror rotation angle of 45 degrees;

FIG. 14 is a cross-sectional view in the main scanning direction showing the lens arrangement of the fifth embodiment at a mirror rotation angle of 48.5 degrees;

FIG. 15 is a cross-sectional view in the main scanning direction showing the lens arrangement of the fifth embodiment at a mirror rotation angle of 41.5 degrees;

FIGS. 16A to

16C schematically show the arrangement of a scanning apparatus embodying the present invention;

FIGS. 17A to

17C schematically show the arrangement when film images are captured at unity magnification by the scanning apparatus of FIGS. 16A to

16C;

FIG. 18 shows the lens arrangement of a lens unit of a sixth embodiment used in the scanning apparatus of FIGS. 16A to

16C and

17A to

17C;

FIG. 19 shows the lens arrangement of a lens unit of a seventh embodiment used in the scanning apparatus of FIGS. 16A to

16C and

17A to

17C; and

FIG. 20 shows the lens arrangement of a lens unit of an eighth embodiment used in the scanning apparatus of FIGS. 16A to

16C and

17A to

17C.

Claims

1. A scanning optical system comprising:

2. A scanning optical system as claimed in claim 1, wherein said image side lens unit is telecentric or substantially telecentric to an image side.

3. A scanning optical system as claimed in claim 1, wherein said object side lens unit is telecentric or substantially telecentric to an object side.

4. A scanning optical system as claimed in claim 1, wherein said mirror is rotatable 360 degrees.

5. A scanning optical system comprising:

6. A scanning optical system comprising:

7. A scanning optical system comprising:

8. A scanning optical system comprising: