Digital camera with zoom lens
View Patent ↗A zoom lens including front and rear elements, the front elements is set up so that the front elements are disposed at a position to satisfy the formula: T 1 ≥ Ha 1 + HH 1 + L + HH 2 + f 2 ( f 1 - L ) f 1 + f 2 - L + f 1 2 m - f 1 , where a length from the top of the front elements on the optical axis to the front main point of the front elements: Ha 1 , a main point of the front elements: HH 1 , a length from the rear main point of the front elements to the front main point of the rear elements: L, a main point of the rear elements: HH 2 , a focal length of the front elements: f 1 , a focal length of the rear elements: f 2 , a length from the object at the time of photography to the front main point of the front elements: m, and a length from the top of the front elements on the optical axis to the imaging plane: T 1 .
1. A zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein a track of the front elements by zooming is set up so that the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a length from the object at the time of near photography to the front side main point of the front elements where the air conversion is carried out on the optical member not included in the front elements: m, and
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 .
2. A zoom lens according to claim 1 , wherein a track of the front elements by zooming is set up in such a manner that the front elements are disposed at a position that formulas set forth below are satisfied
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
T
1
≤
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
-
f
1
.
3. A zoom lens according to claim 1 , wherein a movement of only the rear elements, of the front elements and the rear elements, performs focusing.
4. A zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein a track of the front elements by zooming is set up in such a manner that of zooming areas, at a predetermined area including a predetermined direct magnification neighbor area wherein lateral magnification of the rear elements is direct magnification neighbor, the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
,
and of the zooming areas, at a predetermined zooming point or area excepting the predetermined area, the front elements are disposed at a position that formulas set forth below are satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
1
T
1
<
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a length from the object at the time of near photography to the front side main point of the front elements where the air conversion is carried out on an optical member not included in the front elements: m, and
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 .
5. A zoom lens according to claim 4 , wherein a track of the front elements by zooming is set up in such a manner that at the predetermined area, the front elements are disposed at a position that formulas set forth below are satisfied
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
T
1
≤
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
-
f
1
.
6. A zoom lens according to claim 4 , wherein a movement of only the rear elements, of the front elements and the rear elements, performs focusing.
7. A zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein tracks of the front elements and the rear elements by zooming are set up so that the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and the rear elements are disposed at a position that formula set forth below is satisfied:
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a length from a top of the rear elements on the optical axis to the front side main point of the rear elements: Ha 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a focal length of a whole system comprising the front elements and the rear elements in zoom positions where the air conversion is carried out on the optical member interposed between the front elements and the rear elements: f,
a length from the object at the time of near photography to the front side main point of the whole system where the air conversion is carried out on the optical member not included in the whole system: n
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 , and,
a length from the top of the rear elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the rear elements; T 2 .
8. A zoom lens according to claim 7 , wherein tracks of the front elements and the rear elements by zooming are set up in such a manner that the front elements are disposed at a position that formulas set forth below are satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
T
1
≤
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
-
f
,
and the rear elements are disposed at a position that formulas set forth below are satisfied
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
T
2
≤
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
-
f
,
9. A zoom lens according to claim 7 , wherein a movement of only the rear elements, of the front elements and the rear elements, performs focusing.
10. A zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein tracks of the front elements and the rear elements by zooming are set up in such a manner that of zooming areas, at a predetermined area including a predetermined direct magnification neighbor area wherein lateral magnification of the rear elements is direct magnification neighbor, the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and the rear elements are disposed at a position that formula set forth below is satisfied:
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and of the zooming areas, at a predetermined zooming point or area excepting the predetermined area, the front elements are disposed at a position that formulas set forth below are satisfied
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
1
T
1
>
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and the rear elements are disposed at a position that formulas set forth below are satisfied
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
T
2
<
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a length from a top of the rear elements on the optical axis to a front side main point of the rear elements: Ha 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a focal length of a whole system comprising the front elements and the rear elements in zoom positions where the air conversion is carried out on the optical member interposed between the front elements and the rear elements: f,
a length from the object at the time of near photography to the front side main point of the whole system where the air conversion is carried out on the optical member not included in the whole system: n
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 , and,
a length from the top of the rear elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the rear elements: T 2 .
11. A zoom lens according to claim 10 , wherein tracks of the front elements and the rear elements by zooming are set up in such a manner that at the predetermined area, the front elements are disposed at a position that formulas set forth below are satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
T
1
≤
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
-
f
,
and the rear elements are disposed at a position that formulas set forth below are satisfied
T
2
≥
H
a
2
+
H
H
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
T
2
≤
H
a
2
+
H
H
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
-
f
.
12. A zoom lens according to claim 6 , wherein a movement of only the rear elements, of the front elements and the rear elements, performs focusing.
13. An image taking apparatus comprising an imaging device and a zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein a track of the front elements by zooming is set up so that the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a length from the object at the time of near photography to the front side main point of the front elements where the air conversion is carried out on the optical member not included in the front elements: m, and
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 .
14. An image taking apparatus comprising an imaging device and a zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein a track of the front elements by zooming is set up in such a manner that of zooming areas, at a predetermined area including a predetermined direct magnification neighbor area wherein lateral magnification of the rear elements is direct magnification neighbor, the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
,
and of the zooming areas, at a predetermined zooming point or area excepting the predetermined area, the front elements are disposed at a position that formulas set forth below are satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
1
T
1
<
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a length from the object at the time of near photography to the front side main point of the front elements where the air conversion is carried out on the optical member not included in the front elements: m, and
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 .
15. An image taking apparatus comprising an imaging device and a zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity
a focal length of a whole system comprising the front elements and the rear elements in zoom positions where the air conversion is carried out on the optical member interposed between the front elements and the rear elements: f,
a length from the object at the time of near photography to the front side main point of the whole system where the air conversion is carried out on the optical member not included in the whole system: n
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 , and,
a length from the top of the rear elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the rear elements: T 2 .
16. An image taking apparatus comprising an imaging device and a zoom lens of two elements, which comprises a front elements lens having a negative refractivity and a rear elements lens having a positive refractivity in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein tracks of the front elements and the rear elements by zooming are set up in such a manner that of zooming areas, at a predetermined area including a predetermined direct magnification neighbor area wherein lateral magnification of the in sequence from an object side, in which an object of an arbitrary distance between infinite-point and a predetermined closest distance is formed on an imaging plane,
wherein tracks of the front elements and the rear elements by zooming are set up so that the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and the rear elements are disposed at a position that formula set forth below is satisfied:
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
where a length from a top of the front elements on the optical axis to the front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a length from a top of the rear elements on the optical axis to the front side main point of the rear elements: Ha 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 , rear elements is direct magnification neighbor, the front elements are disposed at a position that formula set forth below is satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and the rear elements are disposed at a position that formula set forth below is satisfied
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
and of the zooming areas, at a predetermined zooming point or area excepting the predetermined area, the front elements are disposed at a position that formulas set forth below are satisfied:
T
1
≥
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
1
T
1
<
Ha
1
+
HH
1
+
L
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
1
2
m
-
f
1
,
and the rear elements are disposed at a position that formulas set forth below are satisfied
T
2
≥
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
T
2
<
Ha
2
+
HH
2
+
f
2
(
f
1
-
L
)
f
1
+
f
2
-
L
+
f
2
n
-
f
,
where a length from a top of the front elements on an optical axis to a front side main point of the front elements: Ha 1 ,
a main point interval of the front elements: HH 1 ,
a length from a rear side main point of the front elements to a front side main point of the rear elements where an air conversion is carried out on an optical member not included in the front elements and the rear elements: L,
a main point interval of the rear elements: HH 2 ,
a length from a top of the rear elements on the optical axis to a front side main point of the rear elements: Ha 2 ,
a focal length of the front elements: f 1 ,
a focal length of the rear elements: f 2 ,
a focal length of the whole system comprising the front elements and the rear elements in zoom positions where the air conversion is carried out on the optical member interposed between the front elements and the rear elements: f,
a length from the object at the time of near photography to the front side main point of the whole system where the air conversion is carried out on the optical member not included in the whole system: n
a length from the top of the front elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the front elements and the rear elements: T 1 , and,
a length from the top of the rear elements on the optical axis to the imaging plane where the air conversion is carried out on the optical member not included in the rear elements: T 2 .