JPH11249014A5

JPH11249014A5 -

Info

Publication number: JPH11249014A5
Application number: JP1998050277A
Authority: JP
Filing date: 1998-03-03
Publication date: 2005-08-25

Description

また、Ｙ方向の光学系全体のパワーをＰｙとし、回転非対称な面の軸上主光線が当たる部分のＹ方向のパワーＰｙｎとするとき、
０＜｜Ｐｙｎ／Ｐｙ｜＜１００・・・（１１）
なる条件式を満足することが、収差補正上好ましい。上記条件式の下限０と上限１００の意味は条件式（１０）の場合と同様である。 Furthermore, when the power of the entire optical system in the Y direction is Py and the power in the Y direction of the portion of the rotationally asymmetric surface on which the axial chief ray strikes is Pyn, then:
0<|Pyn/Py|<100...(11)
It is preferable in terms of aberration correction to satisfy the following condition: The lower limit 0 and the upper limit 100 of the above condition have the same meanings as in the case of condition (10).

この実施例において、マスター光学系ＭＬである偏心プリズム部材１０としては、第１面１１、第２面１２、第３面１３の３つの光学面からなり、その間が屈折率が１より大きい透明媒質で満たされてなり、同軸屈折系であるアタッチメントレンズＡＬ１、ＡＬ２又はＡＬ３、物体側のフィルター類Ｆ１を通過した物体からの光が、第１透過面である第１面１１から屈折して入射し、第３面１３からなる第１反射面で全反射され、第２面１２からなる第２反射面で反射され、その後第３面１３が構成する第２透過面から屈折して射出するものであり、第３面１３は第１反射面と第２透過面を兼用している。また、その第１面１１、第２面１２、第３面１３の３面共、偏心した自由曲面からなる。 In this embodiment, the decentered prism member 10, which is the master optical system ML, consists of three optical surfaces: a first surface 11, a second surface 12, and a third surface 13. A transparent medium with a refractive index greater than 1 fills the spaces between them. Light from an object passes through the attachment lens AL1, AL2, or AL3, which is a coaxial refractive system, and the object-side filters F1. The light is refracted and incident from the first transmitting surface (first surface 11), totally reflected by the first reflecting surface (third surface 13), reflected by the second reflecting surface (second surface 12), and then refracted and emerges from the second transmitting surface (third surface 13). The third surface 13 serves as both the first reflecting surface and the second transmitting surface. Furthermore, all three surfaces (first surface 11, second surface 12, and third surface 13) are decentered free-form surfaces.

この実施例において、マスター光学系ＭＬである偏心プリズム部材１０としては、第１面１１、第２面１２、第３面１３の３つの光学面からなり、その間が屈折率が１より大きい透明媒質で満たされてなり、同軸屈折系であるアタッチメントレンズＡＬ１、ＡＬ２又はカバーガラスＦ３、フィルター類Ｆ１を通過した物体からの光が、第１透過面である第１面１１から屈折して入射し、第３面１３からなる第１反射面で全反射され、第２面１２からなる第２反射面で反射され、その後第３面１３が構成する第２透過面から屈折して射出するものであり、第３面１３は第１反射面と第２透過面を兼用している。また、その第１面１１、第２面１２、第３面１３の３面共、偏心した自由曲面からなる。 In this embodiment, the decentered prism member 10, which is the master optical system ML, consists of three optical surfaces: a first surface 11, a second surface 12, and a third surface 13. A transparent medium with a refractive index greater than 1 fills the spaces between them. Light from an object passes through the attachment lenses AL1 and AL2, or the cover glass F3, or the filters F1, which are coaxial refractive systems. It is refracted and incident from the first transmitting surface (first surface 11), totally reflected by the first reflecting surface (third surface 13), reflected by the second reflecting surface (second surface 12), and then refracted and emerges from the second transmitting surface (third surface 13). The third surface 13 serves as both the first reflecting surface and the second transmitting surface. Furthermore, all three surfaces (first surface 11, second surface 12, and third surface 13) are decentered free-form surfaces.

Claims

An imaging optical system having a master optical system provided with a removable or replaceable attachment optical system on the object side, and an imaging element disposed on an image plane,
an imaging optical system characterized in that the master optical system includes a prism member having at least three optical surfaces, the spaces between which are filled with a transparent medium having a refractive index greater than 1, the prism member having at least one reflecting surface, and at least the reflecting surface being formed into a rotationally asymmetric curved shape that corrects decentration aberrations.

An imaging optical system having, in order from the object side, a detachable or replaceable attachment optical system, a master optical system, and an imaging element disposed on an image plane,
an imaging optical system characterized in that the master optical system includes a prism member having at least three optical surfaces, the spaces between which are filled with a transparent medium having a refractive index greater than 1, the prism member having at least one reflecting surface, and at least the reflecting surface being formed into a rotationally asymmetric curved shape that corrects decentration aberrations.

An imaging device including a joint section for mounting an attachment section that is provided with optical members such as an optical system for converting an angle of view, an optical system for converting a direction of view, and a filter, a master lens section, and an imaging element that receives an object image,
An imaging device characterized in that the master lens section has a prism member, the prism member has at least an entrance surface, a reflecting surface, and an exit surface, and at least the reflecting surface is formed into a rotationally asymmetric curved shape that corrects decentration aberrations.

An imaging device including an attachment unit having optical members such as an optical system for converting an angle of view, an optical system for converting a direction of view, and a filter, a master lens unit disposed on the image side of the attachment unit, a joint unit for attaching the attachment unit to the master lens unit, and an imaging element for receiving an object image,
An imaging device characterized in that the master lens section has a prism member, the prism member has at least an entrance surface, a reflecting surface, and an exit surface, and at least the reflecting surface is formed into a rotationally asymmetric curved shape that corrects decentration aberrations.

3. The imaging optical system according to claim 1, wherein the imaging surface of the imaging element is disposed at an angle with respect to the optical axis of incidence.

10. The imaging optical system according to claim 1, 2, or 5,
the prism member has the reflecting surface and a second reflecting surface disposed opposite the reflecting surface,
A light ray that emerges from the object center, passes through the pupil center, and reaches the image center is defined as an axial chief ray; the direction of the axial chief ray until it reaches the first surface of the prism member is defined as the Z-axis direction; the interior of the decentered surface of the surface is defined as the Y-axis direction; and the axis that constitutes a Cartesian coordinate system together with the Y and Z axes is defined as the X-axis; a parallel beam that is separated by a small amount d in the Y direction from the axial chief ray is incident on the entrance surface side of the prism member; NA'yi is the sine of the angle that the two beams make in the Y-Z plane on the exit side of the prism member; NA'yi/d, which is the value obtained by dividing NA'yi by the width d of the parallel beam, is defined as the power Py in the Y direction of the prism member; and p is the optical path length of the axial chief ray from the surface of the prism member that is located closest to the object until it emerges from the surface of the prism member that is located closest to the image side.
0.1<p×Py<8 (1)
An imaging optical system characterized by satisfying the following:

7. The imaging optical system according to claim 6,
the only symmetry plane of the rotationally asymmetric curved surface is the Y-Z plane;
When the powers in the X direction near the intersections of the axial chief ray with the first reflecting surface and the second reflecting surface are Px1 and Px2, respectively,
|Px1|<|Px2| ...(5)
An imaging optical system characterized by:

8. The imaging optical system according to claim 7,
1<|Px2/Px1|<20...(6)
An imaging optical system characterized by:

7. The imaging optical system according to claim 6,
a second transmitting surface formed of a plane-symmetric curved surface having one plane of symmetry;
a plane of symmetry of the second transmitting surface and the only plane of symmetry of the rotationally asymmetric curved surface are the Y-Z plane,
When the power in the X direction near the intersection point of the axial chief ray with the second reflecting surface is Px2 and the power in the X direction near the intersection point of the axial chief ray with the second transmitting surface is Px3,
|Px3/Px2|<0.5...(7)
However, when there are a plurality of or an infinite number of planes of symmetry for the second transmitting surface, the plane that forms the smallest angle with the only plane of symmetry for the second reflecting surface is set as the plane of symmetry for the second transmitting surface.