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Image reading device

An image reading device and positive image technology, applied in image communication, optics, lenses, etc., can solve problems such as complex composition and poor optical characteristics

Active Publication Date: 2014-01-15
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, since an integrally formed lens array has inferior optical characteristics compared with SLA, in order to obtain good optical characteristics, conventional imaging optical elements combine a plurality of lens arrays in which a plurality of lenses are arranged in a matrix, and Aperture members for preventing stray light are arranged between the incident side and the outgoing side of the imaging optical element and each lens array, so the structure is complicated

Method used

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Experimental program
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no. 1 Embodiment approach ＞

[0035] refer to Figure 1 to Figure 5 A first embodiment in which an image reading device according to the present invention is applied to a CIS module will be described.

[0036] figure 1 It is a perspective view showing a CIS module as a first embodiment of the image reading device according to the present invention, figure 2 A diagram showing the configuration of the lens unit, image 3 is a plan view of the lens unit. Figure 4 is a diagram for explaining the configuration of the lens array, Figure 5 It is a figure for demonstrating the structure of a lens array and an aperture member.

[0037] The CIS module 1 is a device that reads an image printed on the original OB placed on the original glass GL as a reading object, and is arranged directly below the original glass GL. The CIS module 1 has a rectangular parallelepiped frame 2 extending longer than the reading range of the original OB in the X direction, and holds and arranges an illumination member 3 and a lens...

no. 1 Embodiment

[0072] set up

[0073] n: 6 (line pair / mm)

[0074] d: 3.5mm

[0075] Δd: 0.3mm

[0076] p: 0.35mm

[0077] R: 0.8mm

[0078] ap1, ap2: 0.2mm (the length of the long axis direction of the through holes 42a, 43a is 0.5mm)

[0079] t1: 0.5mm, and arrange the lens array 41 and each aperture member 42,43 so that the distance between the incident side aperture member 42 and the first lens surface 41a is 0.5mm, and the exit side aperture member 43 and the second lens The distance of the surface 41b is 0.85mm,

[0080] Get MTF: 100%

[0081] Uneven brightness in the X direction: 6.5%

[0082] Light transmission efficiency: 0.31% of lens unit 4.

[0083] On the other hand, when the first lens surface 41a and the second lens surface 41b are formed in a circular shape with a diameter of 0.72mm,

[0084] MTF: 88%

[0085] Uneven brightness in the X direction: 6.5%

[0086] Light conversion efficiency: 0.25%.

no. 2 Embodiment

[0088] set up

[0089] n: 6 (line pair / mm)

[0090] d: 3.5mm

[0091] p: 0.35mm

[0092] R: 0.8mm

[0093] ap1, ap2: 0.2mm (the length of the long axis direction of the through holes 42a, 43a is 0.5mm)

[0094] t1, t2: 0.5mm

[0095] da1: 2.1mm

[0096]da2: 2.125mm, and arrange the lens array 41 and each aperture member 42,43 so that the distance between the incident side aperture member 42 and the first lens surface 41a is 0.5mm, and the exit side aperture member 43 and the second lens The distance of the surface 41b is 0.85mm,

[0097] Get MTF: 95.2% (Δd: 0mm)

[0098] 74.1% (Δd: 0.3mm)

[0099] 38.9% (Δd: 0.5mm)

[0100] Brightness unevenness in the X direction: 2.9%

[0101] Light transmission efficiency: 0.677% of lens unit 4.

[0102] As above, in this embodiment, by satisfying the first condition, the size of the major diameter R of the first lens surface 41a and the second lens surface 41b in the Y direction can be maintained, and the brightness of the lens ...

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Abstract

The invention provides an iamge reading device including an imaging optical element that has a simple structure and exhibits a good optical property. By satisfying a first condition, the brightness of a lens array (41) can be obtained while retaining the long diameter of a first lens surface (41a) and a second lens surface (41b) in the Y direction, and the resolution of the lens array (41) can be improved by decreasing a lens pitch (p) in the X direction. Moreover, by satisfying a second condition, the MTF at the spatial frequency (line pairs / mm) of the lens array (41) can be definitely set to be greater than 0%. As a result, it is possible to provide a CIS module (1) that includes a lens unit (4) having a good optical property with a simple configuration.

Description

[0001] Cross references to related patent applications [0002] The entire disclosure of Japanese Patent Application No. 2012-139425 filed on Jun. 21, 2012 is expressly incorporated herein by reference. technical field [0003] The present invention relates to an image reading device including an imaging optical element that forms an image of reflected light from an object to be read to form an equal-magnification positive image. Background technique [0004] Conventionally, a contact image sensor (Contact Image Sensor) module (hereinafter, simply referred to as a "CIS module") is used as an image reading device in image scanners, facsimiles, copiers, bank terminals, and the like. In such a CIS module, the following operations are generally performed: Usually, an imaging optical element including SLA (Selphot (registered trademark) lens array) is arranged between the reading object and the optical sensor so that the reflection from the reading object The light is correctly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/031G02B3/00
CPCG02B3/0031G02B3/005G02B3/0068H04N1/0306G02B3/0037
Inventor 小林英和
Owner SEIKO EPSON CORP