WO2005045500A1 - Objective lens system having three lenses - Google Patents

Objective lens system having three lenses Download PDF

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Publication number
WO2005045500A1
WO2005045500A1 PCT/US2004/036908 US2004036908W WO2005045500A1 WO 2005045500 A1 WO2005045500 A1 WO 2005045500A1 US 2004036908 W US2004036908 W US 2004036908W WO 2005045500 A1 WO2005045500 A1 WO 2005045500A1
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WO
WIPO (PCT)
Prior art keywords
lens element
optical system
lens
object side
aspheric
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.)
Ceased
Application number
PCT/US2004/036908
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English (en)
French (fr)
Inventor
Scott Christian Cahall
Carl Frederick Leidig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
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Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to JP2006538502A priority Critical patent/JP2007510955A/ja
Publication of WO2005045500A1 publication Critical patent/WO2005045500A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B13/004—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 four lenses
    • 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 -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
    • 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 -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only

Definitions

  • the present invention relates generally to optical systems and, more particularly, to optical systems having at least three lens elements useable with, for example, light sensitive receivers and/or sensors.
  • Optical systems useable with, for example, light sensitive receivers and/or sensors are known.
  • US 6,560,037 discloses a single element lens with an aperture stop adjacent to a distal surface of the lens element.
  • a single homogenous lens element such as that disclosed by US 6,560,037 does not affect the degree of optical imaging correction required to produce the best resolution on sensors employing hundreds of thousands of pixels.
  • Optical systems having two lens groups or lens elements are also known.
  • a typical reverse-telephoto lens configuration can be described as one where the first lens group or element is negative in power and the second lens group or element is positive in power, when proceeding sequentially from the most distal end of the lens to the sensor. This arrangement causes the back focus of the lens system to be longer than the focal length.
  • the reverse-telephoto configuration is a design form that allows for a generous space between the sensor and the lens element most proximal to the sensor; this space is often used to position additional optics like infrared rejecting filters or a sensor protective plate.
  • the reverse-telephoto lens configuration may help reduce the magnitude of the oblique ray angles incident on the sensor.
  • Other two lens element designs are disclosed that are not of the aforementioned reverse-telephoto configuration.
  • US 5,251,069; US 6,515,809; US patent application 2003/0016452; US patent application 2003/0048549 are such examples of non reverse-telephoto design forms comprised of two groups/elements. Although these latter design forms may not possess the same typical advantageous configuration of a reverse-telephoto lens, they emphasize other aspects of improvement like enhanced manufacturability, reduced cost or more compact size.
  • the non reverse-telephoto design forms may be preferable.
  • image quality will generally be less than what it could be with three or more lens groups/elements.
  • designs of three or more lens elements may be desirable to achieve a suitably high image resolution.
  • Optical systems having at least three lens elements are also known.
  • US 6,441,971 B2; US 6,282,033; US 6,414,802; US 6,476,982; and JP2002162561 disclose three and four lens element/group systems designed for imaging with sensors, generally with an aperture stop at or near the most distal surface of the lens from the sensor.
  • Designs like those disclosed in US 6,282,033, US 6,414,802, US 6,476,982, and JP2002162561 are generally of the type comprised of four or more discrete lens elements that are assembled into at least three groups with an aperture of F/4 or less. Although excellent image quality may often be obtained with a sufficient number of optical surfaces, designs like these are expensive because of the number of lens elements that need to be manufactured and assembled versus designs with fewer elements.
  • US 6,282,033 discloses a lens with an overall system length of about 8 mm and a focal length of about 4.5 mm. The ratio of the overall system length to focal length for this lens is then a little less than 2.
  • the preferred embodiment for US 6,282,033 is one comprising lenses all made from glass with spherical surfaces. The expense of making all elements from glass exceeds the cost of making elements from resin materials in high volume production.
  • the overall system lengths of disclosed lenses are as low as 15 mm for a focal length of 10 mm; consequently, the ratio of overall system length to focal length is approximately 1.5. These lenses are deficient in the area of minimizing the ratio of overall system length to focal length partly because of the use of many lens elements and the inability to compress the design into short lengths.
  • Other lens designs like those disclosed in US 6,441 ,971 , are comprised of just three lens elements and have a relatively high light-collecting aperture of F/2.8 and wide field of view. The use of just three lens elements facilitates a more compact design than the lenses employing more elements.
  • the designs disclosed in US 6,441,971 have a ratio of overall system length to focal length of approximately 1.25.
  • the disclosed designs utilize a positive power glass lens element in the most distal position from the sensor with index of refraction greater than those typical for most plastics and many glasses.
  • the refractive power of an air-material interface is greater when the index of refraction is higher and facilitates the design of a more compact system because lens thicknesses can generally be reduced; however, this design advantage comes at the expense of fabrication and material cost for the glass element(s).
  • Designs that use the less expensive plastic resins with Nd ⁇ 1.6 (e.g., acrylic, polycarbonate) or that include one lens element using the least expensive type glass (e.g. BK7) will generally have a lower overall cost.
  • the designs disclosed in US 6,441,971 are disadvantaged in that they do not solve a problem that is important to the function of many sensors; namely, a significant reduction in the angles of rays incident upon the sensor. These designs have angles that exceed 20 degrees.
  • any dichroic-type filters such as some infrared light rejection filters
  • oblique rays incident on a sensor with light-collecting lenses i.e., a microlenslet array
  • the chief ray angle is set by the lens exit pupil location.
  • Lenses with exit pupil locations approaching infinity provide chief ray angles approaching zero, and are commonly referred to as telecentric.
  • Practically, lenses with a high degree of telecentricity tend to come with increased complexity and increased overall length.
  • some compromise must be made between them and the degree of telecentricty for a given lens solution (while preferably keeping the maximum chief ray angle less than about 20 degrees).
  • an optical system in order from an object side to an image side, includes a first lens element having a positive power, a meniscus shape, and an object side surface.
  • the object side surface of the first lens element is convex toward the object side.
  • a second lens element has a negative power, a meniscus shape, and an object side surface.
  • the object side surface of the second lens element is concave toward the object side.
  • a third lens element has a positive power.
  • An aperture stop is positioned on or in front of an object side of the first lens element.
  • FIG. 1 is a schematic cross sectional view of a first example embodiment of the optical system
  • FIG. 2 is a schematic cross sectional view of a second example embodiment of the optical system
  • FIG. 3 is a schematic cross sectional view of a third example embodiment of the optical system
  • FIG. 4 is a schematic cross sectional view of a fourth example embodiment of the optical system
  • FIG. 5 is a schematic cross sectional view of a fifth example embodiment of the optical system
  • FIG. 6 is a schematic cross sectional view of a sixth example embodiment of the optical system ⁇
  • FIG. 7 is a schematic cross sectional view of a seventh example embodiment of the optical system
  • FIG. 8 is a schematic cross sectional view of an eighth example embodiment of the optical system
  • FIG. 9 is a schematic cross sectional view of a ninth example embodiment of the optical system
  • FIG. 10 is a schematic cross sectional view of a tenth example embodiment of the optical system
  • FIG. 11 is a through-focus MTF plot for the embodiment shown in FIG. 1
  • FIG. 12 is a through-focus MTF plot for the embodiment shown in FIG. 2
  • FIG. 13 is a through-focus MTF plot for the embodiment shown in
  • FIG. 3 is a through-focus MTF plot for the embodiment shown in
  • FIG. 4 FIG. 15 is a through-focus MTF plot for the embodiment shown in
  • FIG. 5 is a through-focus MTF plot for the embodiment shown in
  • FIG. 6 is a through-focus MTF plot for the embodiment shown in FIG. 7
  • FIG. 18 is a through-focus MTF plot for the embodiment shown in
  • FIG. 8 FIG. 19 is a through-focus MTF plot for the embodiment shown in
  • FIG. 9; and FIG. 20 is a through-focus MTF plot for the embodiment shown in
  • FIG. 10 DETAILED DESCRIPTION OF THE INVENTION
  • an optical system 10 includes three lens elements Ei, E 2 , and E 3 arranged in order, along an optical axis 15, from an object side 20 of the optical system 10 to an image side 30 of the optical system 10.
  • An aperture stop 40 is located on an object side of lens element E] and at least one baffle 50 is located between lens elements E] and E 2 .
  • a light sensitive receiver 60 for example, an image sensor or film, is located on an image side of lens element E 3 .
  • An additional element 70 for example, a cover plate and/or filter, is located between light sensitive receiver 60 and lens element E .
  • Typical filters include infrared light rejection filters and/or light blurring filters (e.g. low-pass filters, band pass filters, etc.).
  • the surface radii R of each lens element E l5 E 2 , and E 3 of optical system 10 are numbered beginning at the object side 20 and ending on the image side 30.
  • the thicknesses T n of the lens elements and the airspaces between the lens elements are both labeled as "thickness" and are listed on the same line as the surface preceding the thickness.
  • the first thickness in Table 1 corresponds to the thickness of lens element Ej.
  • the second thickness in Table 1 corresponds to the airspace between lens element E] and baffle 50.
  • All thicknesses provided in Tables 1-10 are in millimeters.
  • All indices and V- numbers (also known as Abbe numbers) are for the helium d line of the spectrum at a wavelength of 587.6 nm. Referring to FIGS. 1 and 2 and Tables 1 and 2, respectively, first and second example embodiments are shown.
  • Optical system 10 includes from object side 20 to image side 30 lens elements Ej, E , and E 3 .
  • Lens element E] is a spherical singlet lens element having a positive power and a meniscus shape convex toward the object side 20.
  • Lens element E 2 is a bi-aspheric singlet lens element having a negative power and a meniscus shape concave toward the object side 20.
  • Lens element E 3 is a spherical singlet lens element having a positive power.
  • Aperture stop 40 is located on the object side surface of lens element Ei. Alternatively, aperture stop 40 can be located spaced apart from the object side surface of lens element E].
  • Baffle 50 for example, a light vignetting aperture, is located between lens elements E] and E 2 . Alternatively, baffle 50 can be positioned on a surface of either or both of lens element E] and E 2 .
  • Lens elements Ej, E 2 , and E 3 are made from glass, resin material (e.g. plastic), and resin material, respectively.
  • lens elements E ls E 2 , and E 3 can be made from glass, resin material, and glass, respectively.
  • lens elements Ej, E , and E can be made from resin material, resin material, and glass, respectively.
  • Each lens element E], E 2 , and E 3 can be made from resin materials.
  • the resin material can be of the type having a glass transition temperature, T g > 300 °F.
  • Nanocomposite optical material can also be used in any one or all of lens elements Ei, E , and E 3 .
  • Lens element Ei, E 2 , and/or E 3 can be made from very low dispersion material (for example, Abbe V-number, V d > 65). For example, in the example embodiment shown in FIG.
  • lens element E ⁇ is spherical and made from very low dispersion material (Abbe V-number, V d > 65, and more preferably Abbe V-number V d > 80). Although similar to the embodiment shown in Fig. 1 and Table 1 , the use of a very low dispersion material for lens element El improves the polychromatic performance of optical system 10. Referring to FIG. 3 and Table 3, a third example embodiment is shown.
  • Optical system 10 includes from object side 20 to image side 30 lens elements Ei, E 2 , and E 3 .
  • Lens element Ej is a bi-aspheric singlet lens element having a positive power and a meniscus shape convex toward the object side 20.
  • Lens element E is a spherical singlet lens element having a negative power and a meniscus shape concave toward the object side 20.
  • Lens element E 3 is a bi- aspheric singlet lens element having a positive power.
  • Aperture stop 40 is located on the object side surface of lens element Ei.
  • aperture stop 40 can be located spaced apart from the object side surface of lens element Ei.
  • Baffle 50 for example, a light vignetting aperture, is located between lens elements Ei and E .
  • baffle 50 can be positioned on a surface of either or both of lens element E] and E 2 .
  • Lens elements Ej, E 2 , and E 3 are made from resin material (e.g. plastic), resin material, and resin material, respectively. However other material combinations are possible.
  • lens elements E l3 E 2 , and E 3 can made from resin material, glass, and resin material, respectively.
  • the resin material can be of the type having a glass transition temperature, T g > 300 °F.
  • Nanocomposite optical material can also be used in any one or all of / lens elements Ei, E 2 , and E 3 .
  • lens element Ej, E 2 , and/or E 3 can be made from very low dispersion material (for example, Abbe V-number, V d > 65).
  • the optical system 10 described in FIG. 3 Table 3, respectively, has a half field of view in object space of at least 25 degrees; a relative aperture of less than f/4; and a maximum index of refraction that is less than 1.60.
  • optical system 10 satisfies the condition L/f 0 ⁇ 1.25, where L is the overall system length from the most distal vertex to the image plane and f 0 is the effective focal length of the lens.
  • L is the overall system length from the most distal vertex to the image plane
  • f 0 is the effective focal length of the lens.
  • Optical system 10 includes from object side 20 to image side 30 lens elements Ej, E 2 , and E 3 .
  • Lens element Ej is a bi-aspheric singlet lens element having a positive power and a meniscus shape convex toward the object side 20.
  • Lens element E 2 is a bi-aspheric singlet lens element having a negative power and a meniscus shape concave toward the object side 20.
  • Lens element E 3 is a spherical singlet lens element having a positive power.
  • Aperture stop 40 is located on the object side surface of lens element Ei.
  • aperture stop 40 can be located spaced apart from the object side surface of lens element Ej.
  • Baffle 50 for example, a light vignetting aperture, is located between lens elements E] and E 2 .
  • baffle 50 can be positioned on a surface of either or both of lens element E] and E .
  • Lens elements Ei, E 2 , and E 3 are made from resin material (e.g. plastic), resin material, and resin material, respectively. However other material combination are possible.
  • lens elements Ei, E 2 , and E 3 can be made from resin material, resin material, and glass, respectively.
  • Nanocomposite optical material can also be used in any one or all of lens elements E ls E 2 , and E .
  • lens element E l3 E 2 , and/or E 3 can be made from very low dispersion material (for example, Abbe V-number, V d > 65).
  • the optical system 10 described in FIGS. 4 and 5 and Tables 4 and 5, respectively, has a half field of view in object space of at least 25 degrees; a relative aperture of less than f/4; and a maximum index of refraction that is less than 1.60. Additionally, the optical system 10 satisfies the condition L/fo ⁇ 1.25, where L is the overall system length from the most distal vertex to the image plane and f ⁇ is the effective focal length of the lens.
  • the resin material can be of the type having a glass transition temperature, T g > 300 °F.
  • T g > 300 °F glass transition temperature
  • all three lens elements Ei, E 2 , and E 3 are made from resin materials of the type having a glass transition temperature, T g > 300 °F, to allow for high temperature assembly operations, storage, or usage.
  • Optical system 10 includes from object side 20 to image side 30 lens elements E], E 2 , and E 3 .
  • Lens element Ej is an aspheric singlet lens element having a positive power and a meniscus shape convex toward the object side 20.
  • lens element Ej can be aspheric.
  • Lens element E 2 is an aspheric singlet lens element having a negative power and a meniscus shape concave toward the object side 20. Either or both surfaces of lens element E 2 can be aspheric.
  • Lens element E is an aspheric singlet lens element having a positive power. Either or both surfaces of lens element E 3 can be aspheric.
  • Aperture stop 40 is located on the object side surface of lens element Ej. Alternatively, aperture stop 40 can be located spaced apart from the object side surface of lens element Ei .
  • Baffle 50 for example, a light vignetting aperture, is located between lens elements E ⁇ and E 2 .
  • baffle 50 can be positioned on a surface of either or both of lens element E ⁇ and E 2 .
  • Lens elements Ej, E 2 , and E 3 are each made from resin materials (e.g. plastic). When a resin material is used, the resin material can be of the type having a glass transition temperature, T g > 300 °F.
  • Nanocomposite optical material can also be used in any one or all of lens elements Ei, E 2 , and E 3 .
  • lens element E ls E 2 , and/or E can be made from very low dispersion material (for example, Abbe V-number, V > 65).
  • the optical system 10 satisfies the condition L/fo ⁇ 1.25, where L is the overall system length from the most distal vertex to the image plane and f 0 is the effective focal length of the lens.
  • each example embodiment of optical system 10 has an overall system length L from the object side surface of lens element Ej to light sensitive receiver 60 is about 6 mm and the effective focal length f 0 for each of these example cases is about 5 mm, giving an L/f 0 ratio less than 1.20.
  • Each example embodiment covers a semi-field of view of at least 28 degrees, is F/2.8 or faster, has a relative illumination in the corner which is approximately 50% of the illumination at the center of the image (or more), has a maximum distortion magnitude less than 4%, and constrains the maximum chief ray angle at the light sensitive receiver 10 or sensor plane to less than about 20 degrees with respect to the sensor plane normal. Referring to FIG. 9 and Table 9, a ninth example embodiment is shown.
  • Optical system 10 includes from object side 20 to image side 30 lens elements Ei, E , and E 3 .
  • Lens element Ei is an aspheric singlet lens element having a positive power and a meniscus shape convex toward the object side 20.
  • the image side surface of lens element E] is aspheric; however either surface of lens element E] can be aspheric.
  • Lens element E is a bi-aspheric singlet lens element having a negative power and a meniscus shape concave toward the object side 20.
  • Lens element E 3 is an aspheric singlet lens element having a positive power.
  • the image side surface of lens element E 3 is aspheric; however either surface of lens element E 3 can be aspheric.
  • Aperture stop 40 is located spaced apart from the object side surface of lens element E ⁇ .
  • aperture stop 40 can be located on the object side surface of lens element Ej.
  • Baffle(s) 50 for example, a light vignetting aperture, is located between lens elements E ⁇ and E .
  • baffle 50 can be positioned on a surface of either or both of lens element Ei and E .
  • Another baffle(s) 50 for example, a light vignetting aperture and/or a glare stop, is located on an image side surface of lens element E 2 .
  • this baffle(s) 50 can be located between lens elements E 2 and E 3 or on a surface of lens element E 3 .
  • Lens elements Ej, E , and E 3 are each made from resin materials (e.g. plastic).
  • the resin material can be of the type having a glass transition temperature, T g > 300 °F.
  • Nanocomposite optical material can also be used in any one or all of lens elements E ls E , and E 3 .
  • lens element Ei, E 2 , and/or E 3 can be made from very low dispersion material (for example, Abbe V-number, V d > 65).
  • the optical system 10 described in FIG. 9 and Table 9 has a half field of view in object space of at least 25 degrees; a relative aperture of less than f/4; and a maximum index of refraction that is less than 1.60.
  • the optical system 10 satisfies the condition L/fo ⁇ 1.25, where L is the overall system length from the most distal vertex to the image plane and f 0 is the effective focal length of the lens.
  • the optical system 10 has an overall system length L from the aperture stop 40 to light sensitive receiver 60 is about 6.3 mm and the effective focal length f 0 is about 5.3 mm, giving an L/f 0 ratio less than 1.20.
  • This example embodiment covers a semi-field of view of at least 29 degrees, is F/2.8 or faster, has a relative illumination in the corner which is approximately 50% of the illumination at the center of the image (or more), has a maximum distortion magnitude less than 4%, and constrains the maximum chief ray angle at the light sensitive receiver 10 or sensor plane to less than about 22 degrees with respect to the sensor plane normal.
  • Optical system 10 includes from object side 20 to image side 30 lens elements E ⁇ , E 2 , and E 3 .
  • Lens element Ej is an aspheric singlet lens element having a positive power and a meniscus shape convex toward the object side 20.
  • the image side surface'of lens element Ej is aspheric; however either surface of lens element E] can be aspheric.
  • Lens element E 2 is a bi-aspheric singlet lens element having a negative power and a meniscus shape concave toward the object side 20.
  • Lens element E 3 is an aspheric singlet lens element having a positive power.
  • the image side surface of lens element E 3 is aspheric; however either surface of lens element E 3 can be aspheric.
  • Aperture stop 40 is located spaced apart from the object side surface of lens element Ei. Alternatively, aperture stop 40 can be located on the object side surface of lens element Ei.
  • Baffle(s) 50 for example, a light vignetting aperture, is located between lens elements E and E .
  • baffle 50 can be positioned on a surface of either or both of lens element E ⁇ and E .
  • Another baffle(s) 50 for example, a light vignetting aperture and/or a glare stop, is located on an image side surface of lens element E .
  • this baffle(s) 50 can be located between lens elements E 2 and E 3 or on a surface of lens element E 3 .
  • Lens elements Ej, E 2 , and E 3 are each made from resin materials
  • Nanocomposite optical material can also be used in any one or all of lens elements E ⁇ , E 2 , and E 3 .
  • lens element E ls E 2 , and/or E 3 can be made from very low dispersion material (for example, Abbe V-number, V d > 65).
  • the optical system 10 described in FIG. 10 and Table 10 has a half field of view in object space of at least 25 degrees; a relative aperture of less than f/4; and a maximum index of refraction that is less than 1.60.
  • the optical system 10 satisfies the condition L/fo ⁇ 1.25, where L is the overall system length from the most distal vertex to the image plane and fo is the effective focal length of the lens.
  • the optical system 10 has an overall system length L from the aperture stop 40 to light sensitive receiver 60 is about 7.13 mm and the effective focal length f 0 is about 6.0 mm, giving an L/fo ratio less than 1.20.
  • each spherical lens element described in the example embodiments is made from low index materials (N d ⁇ 1.6). As such, each spherical element can be made from either optical glass or resin material with only very minor curve changes to these elements while the other lens elements of optical system 10 remain fixed (if desired).
  • an optical system 10 to be prototyped with, for example, two glass spherical lens elements and one plastic lens element. Then, in production, the two glass spherical lens elements can be replaced with spherical plastic elements with no changes to the other optical element(s) and minor or no changes to the mounting hardware (barrel, spacers, etc.). In this manner, a manufacturer can switch between embodiments of the optical system 10 making use of the unique benefits of either optical glass elements or plastic resin elements, as desired, at any point in the product lifecycle, for minimal additional cost. Generally, for glass, the primary benefits would be 1) a more thermally stabile design, 2) a less-costly prototype, and 3) a quicker-to- produce prototype.
  • Lens elements Ei, E 2 , and/or E 3 having an aspheric surface(s) of optical system 10 are typically made from resin materials. Alternatively, these elements can be made from glass; however, cost issues may prohibit this. Lens elements E l5 E , and/or E having a-spherical surface(s) of optical system 10 can be made from either low index glass or resin material as is desired.
  • Suitable light sensitive receivers 60 include, for example, charged coupled devices (CCDs) and complementary metal-oxide sensors (CMOS).
  • optical system 10 described above is adapted to function with these types of light sensitive receivers (sensors) having active diagonal dimensions of less than about eight millimeters.
  • the optical system 10 described above can be scaled either up or down so as to function with light sensitive receivers (sensors) having larger or smaller active diagonal dimensions.
  • the optical system 10 described above lends itself to a variety of film and/or electronic imaging applications.
  • Optical system 10 is particularly suitable for use in consumer mobile imaging applications, for example, camera- enabled cellular phones and personal digital assistants (PDAs). The through-focus MTF plots shown in FIGS.
  • 11 -20 are polychromatic (486 nm at 0.35, 538 nm at 1.00, and 597 nm at 0.50) for the embodiments depicted in FIGS. 1-10 and Tables 1-10, respectively.
  • the MTF plots are shown for 33 line pairs/mm.

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JP2006538502A JP2007510955A (ja) 2003-11-04 2004-11-03 三個のレンズを有する対物レンズ系

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US51724203P 2003-11-04 2003-11-04
US60/517,242 2003-11-04
US10/974,630 US7061695B2 (en) 2003-11-04 2004-10-27 Three element optical system
US10/974,630 2004-10-27

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007094113A (ja) * 2005-09-29 2007-04-12 Fujinon Corp 単焦点レンズ
JP2007094114A (ja) * 2005-09-29 2007-04-12 Fujinon Corp 単焦点レンズ
JP2007094115A (ja) * 2005-09-29 2007-04-12 Fujinon Corp 単焦点レンズ
RU2304795C1 (ru) * 2005-12-27 2007-08-20 Открытое акционерное общество "Красногорский завод им. С.А. Зверева" Объектив
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US7061695B2 (en) 2006-06-13
TW200530653A (en) 2005-09-16

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