Optical system that widens an image capture view angle
First Claim
Patent Images
1. An optical system for imaging an object, the optical system comprising:
- two or more imaging lenses having an anspherical convex surface and a spherical concave surface on which light emitted from the object is incident,a plurality of pairs of cemented lenses that receive light from the two or more imaging lenses;
a spherical lens that receives light from the plurality of cemented lenses, anda polarizer that receives light from the spherical lens to form an image,wherein;
θ
is a half view angle of the optical system,D is a distance from the object to the optical system,y(θ
) is an image height of the image,D(θ
)=1/(dy(θ
)/dθ
is a rate a rate of change of the view angle per image height,dy/dθ
is a rate of change of the image height per view angle,Θ
s is a switching view angle of the rate of change of the view angle per image height,dy/dθ
, is greater than 0 at a maximum view angle θ
max of the optical system,D(θ
)=1/(dy(θ
)/dθ
), satisfies D(θ
p)>
{(D(θ
max)−
D(0))/θ
maxθ
}θ
p+D(0), with θ
p which lies in a range of 0<
θ
<
θ
max, andY(θ
) satisfies 1.5<
(y(θ
s)/θ
s)/{(y(θ
max)−
y(θ
s))/(θ
max−
θ
s)}<
3.0.
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Abstract
Provided is a technology which is suitable for both widening an image capture view angle and securing an angular resolution across the entire image capture range. In an imaging optical system, a rate of change of an image height per view angle, i.e. dy/dθ, is greater than 0 at a maximum view angle θmax, a rate of change of a view angle per image height, i.e. D(θ)=1/(dy(θ)/dθ), satisfies an expression D(θp)>{(D(θmax)−D(0))/θmaxθ}θp+D(0), with θp which lies in a range of 0<θ<θmax, and it satisfies an expression 1.5<(y(θs)/θs)/{(y(θmax)−y(θs))/(θmax−θs)}<3.0 with a switching view angle θs of the rate of change D(θ) of the view angle per image height.
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Citations
6 Claims
-
1. An optical system for imaging an object, the optical system comprising:
-
two or more imaging lenses having an anspherical convex surface and a spherical concave surface on which light emitted from the object is incident, a plurality of pairs of cemented lenses that receive light from the two or more imaging lenses; a spherical lens that receives light from the plurality of cemented lenses, and a polarizer that receives light from the spherical lens to form an image, wherein; θ
is a half view angle of the optical system,D is a distance from the object to the optical system, y(θ
) is an image height of the image,D(θ
)=1/(dy(θ
)/dθ
is a rate a rate of change of the view angle per image height,dy/dθ
is a rate of change of the image height per view angle,Θ
s is a switching view angle of the rate of change of the view angle per image height,dy/dθ
, is greater than 0 at a maximum view angle θ
max of the optical system,D(θ
)=1/(dy(θ
)/dθ
), satisfies D(θ
p)>
{(D(θ
max)−
D(0))/θ
maxθ
}θ
p+D(0), with θ
p which lies in a range of 0<
θ
<
θ
max, andY(θ
) satisfies 1.5<
(y(θ
s)/θ
s)/{(y(θ
max)−
y(θ
s))/(θ
max−
θ
s)}<
3.0. - View Dependent Claims (4, 5, 6)
-
-
2. An optical system for imaging an object, the optical system comprising:
-
two or more imaging lenses having an anspherical convex surface and a spherical concave surface on which light emitted from the object is incident, a plurality of pairs of cemented lenses that receive light from the two or more imaging lenses; a spherical lens that receives light from the plurality of cemented lenses, and a polarizer that receives light from the spherical lens to form an image, wherein; θ
is a half view angle of the optical system,D is a distance from the object to the optical system, y(θ
) is an image height of the image,D(θ
)=1/(dy(θ
)/dθ
is a rate a rate of change of the view angle per image height,dy/dθ
is a rate of change of the image height per view angle,Θ
s is a switching view angle of the rate of change of the view angle per image height,dy/dθ
, is greater than 0 at a maximum view angle θ
max of the optical system,D(θ
)=1/(dy(θ
)/dθ
), satisfies D(θ
p)>
{(D(θ
max)−
D(0))/θ
maxθ
}θ
p+D(0), with θ
p which lies in a range of 0<
θ
<
θ
max,D(θ
) does not have a vertex, andy(θ
) satisfies 1.5<
(y(θ
s)/θ
s)/{(y(θ
max)−
y(θ
s))/(θ
max−
θ
s)}<
3.0.
-
-
3. An optical system for imaging an object, the optical system comprising:
-
two or more imaging lenses having an anspherical convex surface and a spherical concave surface on which light emitted from the object is incident, a plurality of pairs of cemented lenses that receive light from the two or more imaging lenses; a spherical lens that receives light from the plurality of cemented lenses, and a polarizer that receives light from the spherical lens to form an image, wherein; θ
is a half view angle of the optical system,D is a distance from the object to the optical system, y(θ
) is an image height of the image,D(θ
)=1/(dy(θ
)/dθ
is a rate a rate of change of the view angle per image height,dy/dθ
is a rate of change of the image height per view angle,Θ
s is a switching view angle of the rate of change of the view angle per image height,dy/dθ
, is greater than 0 at a maximum view angle θ
max of the optical system,D(θ
)=1/(dy(θ
)/dθ
), satisfies D(θ
p)>
{(D(θ
max)−
D(0))/θ
maxθ
}θ
p+D(0), with θ
p which lies in a range of 0<
θ
<
θ
max,y(θ
) satisfies 1.5<
(y(θ
s)/θ
s)/{(y(θ
max)−
y(θ
s))/(θ
max−
θ
s)}<
3.0,D(θ
) does not have a vertex, andthe optical system has at least one or more inflection points.
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Specification
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- Resources
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Current AssigneeHitachi Astemo Ltd. (Hitachi, Ltd.)
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Original AssigneeHitachi Automotive Systems Limited (Hitachi, Ltd.)
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InventorsMurata, Seiji, Betsui, Keiichi
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Primary Examiner(s)Beck, Leron
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Application NumberUS15/522,616Publication NumberTime in Patent Office1,288 DaysField of Search348135US Class CurrentCPC Class CodesG01C 3/06 Use of electric means to ob...G02B 13/00 Optical objectives speciall...G02B 13/0045 having five or more lensesG02B 13/06 Panoramic objectives; So-ca...G02B 13/18 with lenses having one or m...G02B 7/30 using parallactic triangle ...G02B 9/64 having more than six compon...G03B 15/00 Special procedures for taki...G03B 37/06 involving anamorphosis G03B...H04N 23/45 for generating image signal...
