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Plastic rod lens, rod lens array, rod lens plate, image sensor, and printer

A technology of plastic rod and rod lens, applied in the direction of lens, instrument, printing, etc., can solve the problem of no plastic rod lens, etc., and achieve the effect of small chromatic aberration and good color characteristics

Active Publication Date: 2008-07-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, there is no specific description of a plastic rod lens with small chromatic aberration

Method used

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  • Plastic rod lens, rod lens array, rod lens plate, image sensor, and printer
  • Plastic rod lens, rod lens array, rod lens plate, image sensor, and printer
  • Plastic rod lens, rod lens array, rod lens plate, image sensor, and printer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0219] The stock solution of each layer was prepared as shown in Table 2 below.

[0220] Table 2

[0221] Stock composition (mass%)

Physical properties after curing

PMMA

MMA

TDMA

BYZGR

8FM

Refractive index n

Abbe number v

K

Kmax.-Kmin.

Example 1

Tier 1

46

24

30

-

-

1.502

55.7

166.66

1.90

layer 2

46

29

15

5

5

1.497

54.7

164.76

layer 3

49

37

-

6

8

1.490

54.8

166.64

layer 4

47

23

-

10

20

1.484

54.2

166.18

layer 5

39

3

-

17

41

1.472

53.2

165.91

Comparative example 1

Tier 1

47

23

...

Embodiment 2

[0247] A plastic rod lens was manufactured in the same manner as in Example 1 except that the draw ratio was changed to 3.50 times and the relaxation rate was changed to 500 / 700.

[0248] The radius R of the obtained plastic rod lens is 0.187 mm, and the central refractive index is 1.497. The refractive index distribution in the range of 0.2R to 0.8R from the central axis to the outer periphery is similar to formula (5). In the case of a wavelength of 525nm, the refractive index The distribution constant g is 0.84mm -1 .

[0249] Next, it was the same as in Example 1, except that the distance between the plastic rod lenses was changed from 0.37 mm to 0.39 mm, and the adhesive was changed from "Araldite Rapid" to "s-dine 9607K" manufactured by SEKISUI FULLER Co., Ltd. Fabricated to produce a rod lens array.

[0250] The conjugate length Tc of the rod lens array at 525 nm is 10.0 mm, and the MTF at this time is 72.6%.

[0251] The Tc of the rod lens array was measured at each...

Embodiment 3

[0253] Except having changed the addition amount of the dye of the 4th layer as shown in the following Table 5, it manufactured similarly to Example 2, and manufactured the plastic rod lens and the rod lens array.

[0254] table 5

[0255] dye

Layer 4 (mass%)

Blue ACR

0.003

Blue 4G

0.003

MS Magenta HM-1450

0.003

MS Yellow HD-180

0.006

KAYASORB CY-10

0.003

[0256] The radius R of the obtained plastic rod lens is 0.187 mm, and the central refractive index is 1.497. The refractive index distribution in the range of 0.2R to 0.8R from the central axis to the outer periphery is similar to formula (5). In the case of a wavelength of 525nm, the refractive index The distribution constant g is 0.84mm -1 .

[0257] The conjugate length Tc of the rod lens array is 10.0mm in the case of 525mm, and the MTF at this time is 62.4%.

[0258] The Tc of the rod lens array was measured at each wavelength of 470 nm,...

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Abstract

The invention relates to a plastic rod lens provided with a cylindrical shape with a radius R. A refraction factor n is gradually reduced from center axis towards outer peripheral part. And the plastic rod lens meet following requirements (1) to (3): (1) v<1> is more than or equal to 43 and less than or equal to 60; (2) |{nXv / (n-1)}-{nXv / (n-1)}| is less than 5; (3) n<0>-n<1> is more than or equal to 0.01. In the above expressions, n<1>, n<0>, n, and n respectively represents the outer peripheral part, center, refraction factor n at any point A and any point B of the plastic rod lens; and v<1>, v, and v respectively represents the outer peripheral part, Abbe's number v at any point A and any point B of the plastic rod lens.

Description

technical field [0001] The present invention relates to a plastic rod lens and a rod lens array, a rod lens plate, an image sensor, and a printer that can be used as a light transmission path of a light-concentrating rod lens, an optical sensor, and the like. Background technique [0002] Generally speaking, a plastic rod lens is a lens element made of plastic, has a cylindrical shape, and the refractive index decreases continuously from the center to the outer periphery to form an equal magnification erect image. The plastic rod lens is mirror-ground so that its two ends become parallel planes perpendicular to the central axis, and multiple lenses are closely arranged and bonded into one body. In the form of a rod lens array, it is used as a variety of scanners and copiers such as manual scanners. , fax machines, etc., and are widely used in writing devices for LED printers, etc. The field of use of plastic rod lenses is expanding for reasons such as low cost and compact o...

Claims

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Application Information

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IPC IPC(8): G02B3/00B41J2/44B41J2/45B41J2/455G02B1/04
Inventor 阿部洋佐伯敬中川刚广田宪史
Owner MITSUBISHI CHEM CORP
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