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Rod lens array and image sensor head using rod lens array

一种图像传感器、棒状透镜的技术，应用在透镜、图像通信、仪器等方向，能够解决难以谋求光学系统小型化等问题，达到抑制电力消耗、图像均匀、抑制条斑的效果

Active Publication Date: 2016-08-24
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the smaller the numerical aperture, the longer the conjugate length, making it difficult to miniaturize the optical system

Method used

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  • Rod lens array and image sensor head using rod lens array
  • Rod lens array and image sensor head using rod lens array
  • Rod lens array and image sensor head using rod lens array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0212] 43.5 parts by mass of polymethyl methacrylate (PMMA), 15.5 parts by mass of methyl methacrylate (MMA), 7.5 parts by mass of phenyl methacrylate (PhMA), 3.5 parts by mass of tert-butyl methacrylate (TBMA) , tricyclic methacrylate [5.2.1.0 2,6 ] 30 parts by mass of decyl ester (TCDMA), 0.25 parts by mass of 1-hydroxycyclohexyl phenyl ketone (HCPK), and 0.1 part by mass of hydroquinone (HQ) were heated to 70° C. and kneaded to obtain the first layer. Stock solution (uncured substance).

[0213] 44 parts by mass of PMMA, 17 parts by mass of MMA, 8 parts by mass of PhMA, 5.5 parts by mass of TBMA, 25.5 parts by mass of TCDMA, 0.25 parts by mass of HCPK, and 0.1 parts by mass of HQ are heated to 70°C and kneaded to form the second layer Use stock solution (uncured substance).

[0214]46 parts by mass of PMMA, 16.5 parts by mass of MMA, 11 parts by mass of PhMA, 8.5 parts by mass of TBMA, 12.5 parts by mass of TCDMA, 5.5 parts by mass of 2,2,3,3-tetrafluoropropyl methacrylat...

Embodiment 2

[0239] The cured filament was stretched to 2.34 times at a temperature of 145° C., and then relaxed at a temperature of 127° C. so that the relaxation rate became 0.71. Other conditions were the same as in Example 1. rod lens.

[0240] The radius r of the rod lens obtained in this way is 0.232mm, and the central refractive index n 0 When the wavelength is 525nm, it is 1.503, and the refractive index distribution in the range of 0.2r ~ 0.9r from the center to the outer periphery is similar to the above formula related to the refractive index distribution. When the wavelength is 525nm, the refractive index distribution constant g is 0.43mm -1 . Also, a dye-infused layer is formed from the outer periphery toward the center, and the effective radius r e is 0.220mm, and the numerical aperture NA of the lens is 0.142.

[0241] Using 684 obtained rod lenses, a one-row rod lens array having a lens length of 8.8 mm and an array pitch P of 0.468 mm (the gap between adjacent lenses b...

Embodiment 3

[0246] The cured filament was stretched to 4.11 times at a temperature of 145°C, and then relaxed at a temperature of 127°C so that the relaxation rate became 0.71. Other conditions were the same as in Example 1. rod lens.

[0247] The radius r of the rod lens obtained in this way is 0.175mm, and the central refractive index n 0 When the wavelength is 525nm, it is 1.503, and the refractive index distribution in the range of 0.2r ~ 0.9r from the center to the outer periphery is similar to the above formula related to the refractive index distribution. When the wavelength is 525nm, the refractive index distribution constant g is 0.57 mm -1 . Also, a dye-infused layer is formed from the outer periphery toward the center, and the effective radius r e It is 0.166mm, and the numerical aperture NA of the lens is 0.142.

[0248] Using 914 obtained rod lenses, a one-row rod lens array having a lens length of 6.7 mm and an array pitch P of 0.350 mm (a gap between adjacent lenses: 0 ...

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Abstract

The object of the present invention is to provide a rod lens array with a deep focal depth and a small focal depth spot. According to the present invention, there is provided a rod lens array or the like having at least one rod lens row between two substrates, and the rod lens row is obtained by subtracting a plurality of refractive indices from the center toward the outer periphery. Small cylindrical rod lenses are arranged such that the central axes of the rod lenses are substantially parallel to each other. The rod lens array is characterized in that the average value DOFave of the depth of focus DOF ​​is 0.9 mm or more, and the main rod lens array is The depth of focus spot DOFcv in the scanning direction is 12% or less.

Description

technical field [0001] The present invention relates to a rod lens array and an image sensor head using the rod lens array. More specifically, the present invention relates to a rod lens array mounted on an image sensor used in a flatbed scanner or manual scanner used in a copier or the like, and an image sensor head including such a rod lens array. Background technique [0002] As one of the microlenses, there is known a rod lens in which both end surfaces of a cylinder made of glass or plastic material are mirror-polished. The rod lens may be used not only in the form of a single body but also in the form of a rod lens array in which a plurality of rod lenses are arranged side by side in one or more rows and bonded and fixed. [0003] Such a rod lens array is widely used as a reading optical device for image sensors mounted in various scanners such as manual scanners, copiers, facsimile machines, and the like. [0004] Since copiers are being colored, rod lens arrays, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/26G02B3/00G03B27/50G03B27/54H04N1/028
CPCG02B3/0037G02B3/005H01L27/14627
Inventor 北村成史入江菊枝川原田泰
Owner MITSUBISHI CHEM CORP
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