IMAGE-SCANNING DEVICE

• US 20100284045A1
• Filed: 03/26/2008
• Published: 11/11/2010
• Est. Priority Date: 07/13/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Kawano, Hiroyuki, Okamoto, Tatsuki, Nishimae, Junichi, Katsura, Tomotaka
• Granted Patent: US 8,482,813 B2
• Time in Patent Office: Days
• US Class Current: 358/474
• CPC Class Codes: G02B 3/005 arranged along a single direction only, e.g. lenticular sheets G02B3/0043 takes precedence
• CPC Class Codes: G02B 5/10 with curved faces
• CPC Class Codes: G03B 27/50 with slit or like diaphragm moving over original for progressive exposure G03B27/34 takes precedence ; projection optics per se G03B27/525
• CPC Class Codes: H04N 1/02845 using an elongated light source, e.g. tubular lamp, LED array
• CPC Class Codes: H04N 1/03 with photodetectors arranged in a substantially linear array
• CPC Class Codes: H04N 1/0305 with multiple folds of the optical path
• CPC Class Codes: H04N 1/0306 using a plurality of optical elements arrayed in the main scan direction, e.g. an array of lenses
• CPC Class Codes: H04N 1/193 using electrically scanned linear arrays , e.g. linear CCD arrays
• CPC Class Codes: H04N 1/1934 Combination of arrays
• CPC Class Codes: H04N 1/1935 Optical means for mapping the whole or part of a scanned line onto the array

Abstract

An image-scanning device having a large depth of field and being small in size. The image-scanning device includes a plurality of cells and an image pickup device that is located so as to correspond to the cells and that picks-up the formed images. Each cell includes a first lens having a first focal length; an aperture member located at the first focal length from the first lens; and a second lens located at a second focal length shorter than the first focal length, with respect to the image pickup device.

Claims

1. An image-scanning device characterized by comprising:

an illuminating device configured to illuminate an object being picked up which corresponds to an imaging target;

a plurality of image-forming optical systems configured to form images of the object being picked up;

an image pickup device configured to be located so as to correspond to the image-forming optical systems and to pickup the formed images; and

an image processing device configured to restore an original object being picked up from the images obtained by the image pickup device,

wherein the plurality of image-forming optical systems are arranged to be adjacent to each other in a main scanning direction with respect to the object being picked up, and form images of the object being picked up such that the object being picked up is inverted and reduced in size,

each of the image-forming optical systems includes a first optical element having a first focal length;

an aperture member located at a focus position in a rear side of the first optical element; and

a second optical element provided in a rear side of the aperture member and having a second focal length shorter than the first focal length, the first optical element, the aperture member, and the second optical element being disposed from a side of the object being picked up to a side of the image pickup device, and

in between two image-forming optical systems arranged to be adjacent to each other, the image pickup device includes a region in which the images picked up by the image pickup device are overlapped.

2. The image-scanning device according to claim 1, wherein each of the image-forming optical systems further includes a mirror disposed in an optical path traveling from the object being picked up to the image pickup device and configured to fold the optical path.

3. The image-scanning device according to claim 1, wherein the aperture member has a mirror at an opening of the aperture member, the mirror folding an optical path.

4. The image-scanning device according to claim 1, wherein at least one of the first optical element and the second optical element is a reflective-type mirror lens.

5. The image-scanning device according to claim 1, wherein at least one of the first optical element and the second optical element is molded into one piece between adjacent image-forming optical systems.

6. The image-scanning device according to claim 1, wherein the aperture member can be changed with an aperture member having an opening different in size.

7. The image-scanning device according to claim 1, wherein each of the image-forming optical systems further includes a light-shielding plate disposed between adjacent second optical elements.

8. The image-scanning device according to claim 1, wherein a size-reduction magnification is identical for all the image-forming optical systems and is 0.85 to 0.6×

.