USRE43592E1 - Photographic lens - Google Patents
Photographic lens Download PDFInfo
- Publication number
- USRE43592E1 USRE43592E1 US11/280,934 US28093405A USRE43592E US RE43592 E1 USRE43592 E1 US RE43592E1 US 28093405 A US28093405 A US 28093405A US RE43592 E USRE43592 E US RE43592E
- Authority
- US
- United States
- Prior art keywords
- lens element
- image
- lens
- line
- photographic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
Definitions
- the portable module camera is a camera used in a portable telephone, etc.
- the WEB camera is a camera used for transmission of image data via the Internet.
- Many photographic lenses used in these small electronic devices also emphasize smallness and portability and are constructed by using only one lens element.
- the number of lens elements be increased to two in order to obtain a sufficient optical performance so as to match the details detectable by the large number of image elements of recently developed image sensors.
- the use of a negative lens element combined with a positive lens element has been tried in the past as photographic lenses of a two-piece construction.
- few of such conventional photographic lenses of two-piece construction have a sufficient compactness in overall length.
- the need for development of photographic lenses suitable for use with compact image sensors having a high number of image elements i.e., photographic lenses which have improved optical performance without extending the overall length of the photographic lens, has increased.
- the development of small, yet high-performance, photographic lenses which are no larger in size than about 10 cm 3 , including the image sensor is desired.
- the object of the invention is to provide a photographic lens which enables the overall length of the lens to be shortened and, more particularly, to provide a lens having only two lens elements and which provides an improved optical performance at the periphery of the image field as compared to a photographic lens formed of a single lens element.
- FIG. 1 is a sectional view showing a photographic lens according to Embodiment 1;
- FIG. 2 is a sectional view showing a photographic lens according to Embodiment 2;
- FIG. 3 is a sectional view showing a photographic lens according to Embodiment 3;
- FIG. 4 is a sectional view showing a photographic lens according to Embodiment 4.
- FIG. 5 is a sectional view showing a photographic lens according to Embodiment 5.
- FIGS. 6(A)-6(C) show aberrations of the photographic lens of Embodiment 1, with FIG. 6(A) showing the spherical aberration, FIG. 6(B) showing the astigmatism, and FIG. 6(C) showing the distortion;
- FIGS. 7(A)-7(C) show aberrations of the photographic lens of Embodiment 2, with FIG. 7(A) showing the spherical aberration, FIG. 7(B) showing the astigmatism, and FIG. 7(C) showing the distortion;
- FIGS. 8(A)-8(C) show aberrations of the photographic lens of Embodiment 3, with FIG. 8(A) showing the spherical aberration, FIG. 8(B) showing the astigmatism, and FIG. 8(C) showing the distortion;
- FIGS. 9(A)-9(C) show aberrations of the photographic lens of Embodiment 4, with FIG. 9(A) showing the spherical aberration, FIG. 9(B) showing the astigmatism, and FIG. 9(C) showing the distortion; and
- FIGS. 10(A)-10(C) show aberrations of the photographic lens of Embodiment 5, with FIG. 10(A) showing the spherical aberration, FIG. 10(B) showing the astigmatism, and FIG. 10(C) showing the distortion.
- the present invention relates to a photographic lens which is mainly used in small electronic devices having an image sensor chip, such as found in a portable module camera, a WEB camera, and so on.
- the photographic lens according to the invention is formed of only two lens elements. In order from the object side, these are: a biconvex lens element having two aspherical surfaces, and a negative meniscus lens element having two aspherical surfaces and with its convex surface on the image side.
- the aspherical surface is a curved surface obtained by rotating a curve defined by Equation (A) around the optical axis Z 0 .
- the image-side aspherical surface of the meniscus lens element be shaped so that it has a positive refractive power near the optical axis and a negative refractive power near its periphery. This facilitates matching the imaging positions of the sagittal image plane light and the tangential image plane light.
- the photographic lens 1 A is formed of only two lens elements L 1 , L 2 arranged in order from the object side along the optical axis Z 0 .
- a stop St is provided on the object side of the first lens element L 1 .
- a cover glass LC may be arranged on the image side of the second lens element L 2 , as desired.
- the cover glass LC serves to protect the image pickup surface of an image sensor, such as a CCD array.
- the cover glass LC is shown as being positioned to the left side of the imaging plane 3 ; however, it actually is positioned with a surface in contact with an image sensor surface that is positioned at the image plane.
- Condition (1) If Condition (1) is not satisfied the on-axis distance between the two lens elements L 1 and L 2 increases, thus increasing the overall length of the lens. Also certain aberrations increase.
- Condition (2) If Condition (2) is not satisfied the sagittal image plane and the tangential image plane separate and distortion increases. Moreover, the amount of light in the periphery of an image will decrease.
- lens elements L 1 and L 2 of different optical material so as to satisfy Conditions (3) and (4), lateral color is favorably corrected.
- FIG. 1 illustrates a photographic lens according to Embodiment 1 of the present invention. As the components have already been discussed further discussion will be omitted.
- the focal length f of the photographic lens In the bottom portion of the Table is listed the focal length f of the photographic lens.
- Those surfaces that have an asterisk to the right of the surface number in Table 1 are aspherical, having a shape as set forth in Equations (A) and (B) above.
- Table 2 below lists the constants of the aspherical surfaces, where the letter “E” following a number indicates that the number which follows is the exponent to the base 10. For example, 1.0E-02 represents the number 1.0 ⁇ 10 ⁇ 2 .
- FIGS. 6(A)-6(C) show aberrations of the photographic lens of Embodiment 1, with FIG. 6(A) being the spherical aberration (in mm), FIG. 6(B) being the astigmatism (in mm) for both the sagittal S and tangential T image planes, and FIG. 6(C) being the distortion (in %).
- the aberrations are for the d line, and the half-image angle ⁇ is indicated.
- the solid line represents the sagittal image plane aberration and the dotted line represents the tangential image plane aberration.
- FIG. 2 illustrates a photographic lens according to Embodiment 2 of the present invention, which has a basic lens element structure similar to FIG. 1 . Thus, further discussion will be omitted.
- N d index of refraction
- Table 4 lists the constants of the aspherical surfaces, where the letter “E” following a number indicates that the number which follows is the exponent to the base 10. For example, 1.0E-02 represents the number 1.0 ⁇ 10 ⁇ 2 .
- FIGS. 7(A)-7(C) show aberrations of the photographic lens of Embodiment 2, with FIG. 7(A) being the spherical aberration (in mm), FIG. 7(B) being the astigmatism (in mm) for both the sagittal S and tangential T image planes, and FIG. 7(C) being the distortion (in %).
- the aberrations are for the d line, and the half-image angle ⁇ is indicated.
- the aberrations are favorably corrected, and each of Conditions (1) and (2) is satisfied.
- FIG. 3 illustrates a photographic lens according to Embodiment 3 of the present invention, which has a basic lens element structure similar to FIG. 1 . Thus, further discussion will be omitted.
- N d index of refraction
- Table 6 lists the constants of the aspherical surfaces, where the letter “E” following a number indicates that the number which follows is the exponent to the base 10. For example, 1.0E-02 represents the number 1.0 ⁇ 10 ⁇ 2 .
- FIGS. 8(A)-8(C) show aberrations of the photographic lens of Embodiment 3, with FIG. 8(A) being the spherical aberration (in mm), FIG. 8(B) being the astigmatism (in mm) for both the sagittal S and tangential T image planes, and FIG. 8(C) being the distortion (in %).
- the aberrations are for the d line, and the half-image angle ⁇ is indicated.
- the aberrations are favorably corrected, and each of Conditions (1) and (2) is satisfied.
- FIG. 4 illustrates a photographic lens according to Embodiment 4 of the present invention, which has a basic lens element structure similar to FIG. 1 . Thus, further discussion will be omitted.
- the focal length f of the photographic lens In the bottom portion of the Table is listed the focal length f of the photographic lens.
- Those surfaces that have an asterisk to the right of the surface number in Table 7 are aspherical, having a shape as set forth in Equations (A) and (B) above.
- Table 8 lists the constants of the aspherical surfaces, where the letter “E” following a number indicates that the number which follows is the exponent to the base 10. For example, 1.0E-02 represents the number 1.0 ⁇ 10 ⁇ 2 .
- FIGS. 9(A)-9(C) show aberrations of the photographic lens of Embodiment 4, with FIG. 9(A) being the spherical aberration (in mm), FIG. 9(B) being the astigmatism (in mm) for the both the sagittal S and tangential T image planes, and FIG. 9(C) being the distortion (in %).
- the aberrations are for the d line, and the half-image angle ⁇ is indicated.
- the aberrations are favorably corrected, and each of Conditions (1)-(4) is satisfied.
- FIG. 5 illustrates a photographic lens according to Embodiment 5 of the present invention, which has a basic lens element structure similar to FIG. 1 . Thus, further discussion will be omitted.
- the focal length f of the photographic lens In the bottom portion of the Table is listed the focal length f of the photographic lens.
- Those surfaces that have an asterisk to the right of the surface number in Table 9 are aspherical, having a shape as set forth in Equations (A) and (B) above.
- Table 10 lists the constants of the aspherical surfaces, where the letter “E” following a number indicates that the number which follows is the exponent to the base 10. For example, 1.0E-02 represents the number 1.0 ⁇ 10 ⁇ 2 .
- FIGS. 10(A)-10(C) show aberrations of the photographic lens of Embodiment 5, with FIG. 10(A) being the spherical aberration (in mm), FIG. 10(B) being the astigmatism (in mm) for both the sagittal S and tangential T image planes, and FIG. 10(C) being the distortion (in %).
- the aberrations are for the d line, and the half-image angle ⁇ is indicated.
- the aberrations are favorably corrected, and each of Conditions (1)-(4) is satisfied.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
f(ρ)=[Cρ2/{1+(1−K C2ρ2)1/2}]+A4ρ4+A6ρ6+A8ρ8+A10ρ10 Equation (A)
and
ρ2=x2+y2 Equation (B)
where Where
-
- ρ is measured in a direction perpendicular to the optical axis Z0; as per Equation (B), with x and y being coordinate points on respective X and Y coordinate axes that are each perpendicular to the optical axis Z0 and to one another,
- C(=1/R) is the reciprocal of the radius of curvature R of the aspherical surface near the optical axis,
- xX and y are coordinate points on the X and Y axis, respectively, which are each perpendicular to the optical axis Z0 and to each other;
- K is the eccentricity, and
- A4, A6, A8, A10 are the respective aspherical coefficients of ρ raised to the fourth, sixth, eighth and tenth powers, respectively.
2·dd2<dd1 Condition (1)
|R3>R4| Condition (2)
where,
-
- dd1 is the on-axis distance between the object-side surface and the image-side surface of the biconvex lens element,
- dd2 is the on-axis distance between the image-side surface of the biconvex lens element and the object-side surface of the negative meniscus lens element,
- R3 is the absolute value of the radius of curvature of the image-side surface of the biconvex lens element, and
- R4 is the absolute value of the radius of curvature of the object-side surface of the meniscus lens element.
νd1>50 Condition (3)
νd2<35 Condition (4)
where
-
- νd1 is the Abbe number, at the d line, of the biconvex lens element, and
- νd2 is the Abbe number, at the d line, of the meniscus lens element.
TABLE 1 | ||||
# | R | D | Nd | νd |
1 | ∞ | (stop) | 0.1 | |||
2* | 4.5248 | 2.46558 | (dd1) | 1.53105 | 55.5 | |
3* | −1.4766 | 1.03908 | (dd2) | |||
4* | −0.5828 | 1.10729 | 1.53105 | 55.5 | ||
5* | −0.8074 | 0 | ||||
6 | ∞ | 0.3 | 1.51633 | 64.2 | ||
7 | ∞ | 1.03326 | ||||
8 | ∞ | (Img) | ||||
f = 3.5 mm |
TABLE 2 | ||||||
# | C | K | A4 | A6 | A8 | A10 |
2 | 0.2210 | −27.3400 | 4.7168E−03 | −5.5410E−03 | 3.0989E−06 | 5.7558E−07 |
3 | −0.6772 | −1.4276 | −4.4337E−02 | −2.4288E−04 | −8.3349E−07 | −2.3121E−09 |
4 | −1.7160 | −0.4247 | 1.8005E−02 | 9.8555E−05 | 3.5042E−07 | 1.0007E−09 |
5 | −1.2385 | −0.6372 | 3.9521E−02 | 5.2552E−04 | 2.5703E−05 | 3.1260E−07 |
TABLE 3 | ||||
# | R | D | Nd | νd |
1 | ∞ | (stop) | 0.05 | |||
2* | 4.3883 | 2.74817 | (dd1) | 1.531029 | 55.5 | |
3* | −1.4487 | 1.05586 | (dd2) | |||
4* | −0.4913 | 0.88726 | 1.531029 | 55.5 | ||
5* | −0.6961 | 0 | ||||
6 | ∞ | 0.3 | 1.516312 | 64.2 | ||
7 | ∞ | 1.00383 | ||||
8 | ∞ | (Img) | ||||
f = 3.52 mm |
TABLE 4 | ||||||
# | C | K | A4 | A6 | A8 | A10 |
2 | 0.2279 | −16.9453 | 6.3449E−03 | −5.5390E−03 | 3.1005E−06 | 5.7561E−07 |
3 | −0.6903 | −1.4734 | −3.4053E−02 | −1.6542E−04 | −5.2226E−07 | −1.3722E−09 |
4 | −2.0353 | −0.4890 | 1.5330E−02 | 7.4376E−05 | 2.4721E−07 | 6.9815E−10 |
5 | −1.4365 | −0.6705 | 3.1650E−02 | 4.9449E−04 | 2.5647E−05 | 3.1272E−07 |
TABLE 5 | ||||
# | R | D | Nd | νd |
1 | ∞ | 0.05 | ||||
2* | 4.1399 | 2.54477 | (dd1) | 1.531029 | 55.5 | |
3* | −1.2428 | 0.87945 | (dd2) | |||
4* | −0.4995 | 1.15749 | 1.531029 | 55.5 | ||
5* | −0.6035 | 0 | ||||
6 | ∞ | 0.3 | 1.516312 | 64.2 | ||
7 | ∞ | 0.74984 | ||||
8 | ∞ | (Img) | ||||
f = 2.8 mm |
TABLE 6 | ||||||
# | C | K | A4 | A6 | A8 | A10 |
2 | 0.2416 | −16.7875 | 6.3491E−03 | −5.5390E−03 | 3.1005E−06 | 5.7561E−07 |
3 | −0.8046 | −0.9488 | −3.4059E−02 | −1.6547E−04 | −5.2245E−07 | −1.3727E−09 |
4 | −2.0019 | −0.4916 | 1.5323E−02 | 7.4362E−05 | 2.4722E−07 | 6.9822E−10 |
5 | −1.6571 | −0.7550 | 3.1674E−02 | 4.9464E−04 | 2.5648E−05 | 3.1273E−07 |
TABLE 7 | ||||
# | R | D | Nd | νd |
1 | ∞ | (stop) | 0.3944 | |||
2* | 2.2630 | 1.4900 | (dd1) | 1.53105 | 55.5 | |
3* | −0.6000 | 0.2516 | (dd2) | |||
4* | −0.3228 | 0.6979 | 1.583641 | 30.2 | ||
5* | −0.6211 | 0.0000 | ||||
6 | ∞ | 0.5500 | 1.516798 | 64.2 | ||
7 | ∞ | 0.8456 | ||||
8 | ∞ | (Img) | ||||
f = 2.1 mm |
TABLE 8 | ||||||
# | C | K | A4 | A6 | A8 | A10 |
2 | 0.4419 | −4.70921 | 1.2952E−02 | −4.6046E−02 | 6.0066E−05 | 2.6023E−05 |
3 | −1.6667 | −1.41564 | −1.4771E−01 | −2.0134E−03 | −1.6147E−05 | −1.0452E−07 |
4 | −3.0979 | −0.57437 | 5.9928E−02 | 8.1765E−04 | 6.7898E−06 | 4.5253E−08 |
5 | −1.6100 | −0.37642 | 1.5125E−01 | 4.3679E−03 | 4.9820E−04 | 1.4133E−05 |
TABLE 9 | ||||
# | R | D | Nd | νd |
1 | ∞ | (stop) | 0.3446 | |||
2* | 2.0860 | 1.4277 | (dd1) | 1.531029 | 55.5 | |
3* | −0.6000 | 0.3565 | (dd2) | |||
4* | −0.3489 | 0.7996 | 1.583599 | 30.5 | ||
5* | −0.6158 | 0.0000 | ||||
6 | ∞ | 0.5500 | 1.51678 | 64.2 | ||
7 | ∞ | 0.2803 | ||||
8 | ∞ | (Img) | ||||
f = 1.93 mm |
TABLE 10 | ||||||
# | C | K | A4 | A6 | A8 | A10 |
2 | 0.3916 | −26.9387 | 2.5715E−02 | −9.3289E−02 | 1.6142E−04 | 9.2758E−05 |
3 | −1.6091 | −0.9142 | −2.4149E−01 | −4.0915E−03 | −4.3428E−05 | −3.7265E−07 |
4 | −2.9153 | −0.6239 | 9.8149E−02 | 1.6608E−03 | 1.8262E−05 | 1.6129E−07 |
5 | −2.3267 | −0.5803 | 2.1490E−01 | 8.8441E−03 | 1.3388E−03 | 5.0377E−05 |
Claims (11)
2·dd2<dd1 Condition (1)
R3>R4 Condition (2)
nd1>50νd1>50 Condition (3)
νd2<35 Condition (4)
νd1>50 Condition (3)
νd2<35 Condition (4)
2·dd2<dd1 Condition (1)
|R3|>|R4| Condition (2)
νd1>50 Condition (3)
νd2<35 Condition (4)
νd1>50 Condition (3)
νd2<35 Condition (4)
νd1>50
νd2>=35
νd1>50
νd2>=35
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/280,934 USRE43592E1 (en) | 2001-09-07 | 2005-11-17 | Photographic lens |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001271624A JP3685486B2 (en) | 2001-09-07 | 2001-09-07 | Shooting lens |
JP2001-271624 | 2001-09-07 | ||
US10/225,358 US6650485B2 (en) | 2001-09-07 | 2002-08-22 | Photographic lens |
US11/280,934 USRE43592E1 (en) | 2001-09-07 | 2005-11-17 | Photographic lens |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/225,358 Reissue US6650485B2 (en) | 2001-09-07 | 2002-08-22 | Photographic lens |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE43592E1 true USRE43592E1 (en) | 2012-08-21 |
Family
ID=19097107
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/225,358 Ceased US6650485B2 (en) | 2001-09-07 | 2002-08-22 | Photographic lens |
US11/280,934 Expired - Lifetime USRE43592E1 (en) | 2001-09-07 | 2005-11-17 | Photographic lens |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/225,358 Ceased US6650485B2 (en) | 2001-09-07 | 2002-08-22 | Photographic lens |
Country Status (2)
Country | Link |
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US (2) | US6650485B2 (en) |
JP (1) | JP3685486B2 (en) |
Families Citing this family (23)
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US6927927B2 (en) * | 2001-11-27 | 2005-08-09 | Minolta Co., Ltd. | Taking lens system |
TWI261682B (en) * | 2002-04-16 | 2006-09-11 | Konica Corp | Miniature image-capturing lens, image-capturing unit and mobile terminal provided therewith |
JP2003329921A (en) | 2002-05-10 | 2003-11-19 | Seiko Epson Corp | Image pickup lens |
JP3717483B2 (en) * | 2003-02-19 | 2005-11-16 | フジノン株式会社 | Imaging lens |
KR100545068B1 (en) * | 2003-04-30 | 2006-01-24 | 삼성전기주식회사 | Camera Lens Using Imaging Device |
JP2004361440A (en) * | 2003-05-30 | 2004-12-24 | Seiko Precision Inc | Photographic lens and imaging apparatus using the same |
KR101012697B1 (en) | 2003-06-20 | 2011-02-09 | 삼성테크윈 주식회사 | Optical system for forming image |
JP2005037764A (en) | 2003-07-17 | 2005-02-10 | Olympus Corp | Image pickup optical system and imaging apparatus using same |
DE602004031340D1 (en) * | 2003-07-23 | 2011-03-24 | Konica Minolta Opto Inc | ILLUMINATING LENS AND PICTURE DEVICE |
DE10358374A1 (en) * | 2003-12-11 | 2005-07-07 | Vision & Control Gmbh | Electronic camera objective for e.g. machine-vision imaging, having greater depth of focus at f numbers exceeding specified value, combines condenser lens with correction lens |
CN1328609C (en) * | 2004-05-15 | 2007-07-25 | 清华大学 | Taking lens system |
CN1323306C (en) * | 2004-06-16 | 2007-06-27 | 清华大学 | Micro photographic lens system |
CN100462769C (en) * | 2004-08-18 | 2009-02-18 | 清华大学 | Minitype pick-up lens system |
CN100419488C (en) * | 2004-08-27 | 2008-09-17 | 清华大学 | Micro-camera lens system |
CN100462771C (en) * | 2004-09-08 | 2009-02-18 | 清华大学 | Micro-camera lens system |
CN100462770C (en) * | 2004-10-28 | 2009-02-18 | 清华大学 | Minisize camera lens system |
JP3857713B2 (en) | 2005-05-25 | 2006-12-13 | 株式会社エンプラス | Imaging lens |
JP2009008758A (en) | 2007-06-26 | 2009-01-15 | Fujinon Corp | Imaging device, camera module and portable terminal equipment |
CN102466855A (en) * | 2010-11-16 | 2012-05-23 | 一品光学工业股份有限公司 | Optical imaging lens with two lenses |
TWI422857B (en) * | 2010-12-15 | 2014-01-11 | Largan Precision Co Ltd | Photographing optical lens assembly |
WO2012100405A1 (en) | 2011-01-24 | 2012-08-02 | Ether Precision, Inc. | Two lens module including a plano-convex lens |
JP5585471B2 (en) * | 2011-01-28 | 2014-09-10 | コニカミノルタ株式会社 | Imaging lens and image processing apparatus |
CN106780378B (en) * | 2016-12-08 | 2017-12-05 | 中国人民解放军国防科学技术大学 | A kind of blind convolved image restored method that two lenses lens have been corrected for aberration |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09203858A (en) | 1996-01-25 | 1997-08-05 | Olympus Optical Co Ltd | Lens for read |
US5835288A (en) | 1996-05-13 | 1998-11-10 | Fuji Photo Optical Co., Ltd. | Imaging lens |
-
2001
- 2001-09-07 JP JP2001271624A patent/JP3685486B2/en not_active Expired - Fee Related
-
2002
- 2002-08-22 US US10/225,358 patent/US6650485B2/en not_active Ceased
-
2005
- 2005-11-17 US US11/280,934 patent/USRE43592E1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09203858A (en) | 1996-01-25 | 1997-08-05 | Olympus Optical Co Ltd | Lens for read |
US5917661A (en) | 1996-01-25 | 1999-06-29 | Olympus Optical Co., Ltd. | Reading lens system |
US5835288A (en) | 1996-05-13 | 1998-11-10 | Fuji Photo Optical Co., Ltd. | Imaging lens |
Also Published As
Publication number | Publication date |
---|---|
JP3685486B2 (en) | 2005-08-17 |
US6650485B2 (en) | 2003-11-18 |
JP2003075719A (en) | 2003-03-12 |
US20030117723A1 (en) | 2003-06-26 |
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