Decentered optical system, light transmitting device, light receiving device, and optical system
First Claim
1. A decentered optical system in which a substantially parallel light beam is used as the input light, comprising:
- a first optical element having positive power, a second optical element having a rotationally asymmetric decentered reflecting surface that is disposed decentered from and tilted on the optical axis of the input light, and at least one a third optical element formed by an optically active surface having a positive power in order along the optical path of the input light; and
further, an intermediate image is formed by these first and second elements and an exit pupil is formed by the first through third optical elements; and
a focusing device that focuses the light beam that has passed through the exit pupil onto at least one light receiving plane, whereby a principal ray and a subsidiary ray of the axial light beam incident on the exit pupil is almost parallel.
1 Assignment
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Accused Products
Abstract
The decentered optical system is configured by a first, a second and a third reflecting mirror disposed decentered, a focusing device, and a light receiver. The optical path is folded by the first, second, and third reflecting mirrors, aberration correction is carried out by a rotationally asymmetric reflecting surface, and an intermediate image is formed between the second and third reflecting mirrors and another reflecting mirror. The reflected light of the third reflecting mirror is made to form a substantially parallel light beam that forms an exit pupil. An image is formed on the light receiving surface by the focusing device. This decentered optical system is used in a light transmitting device, a light receiving device, and a light transmitting and receiving system, and carries out light tracking by detecting the position of the received light image.
51 Citations
34 Claims
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1. A decentered optical system in which a substantially parallel light beam is used as the input light, comprising:
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a first optical element having positive power, a second optical element having a rotationally asymmetric decentered reflecting surface that is disposed decentered from and tilted on the optical axis of the input light, and at least one a third optical element formed by an optically active surface having a positive power in order along the optical path of the input light; and
further,an intermediate image is formed by these first and second elements and an exit pupil is formed by the first through third optical elements; and
a focusing device that focuses the light beam that has passed through the exit pupil onto at least one light receiving plane, whereby a principal ray and a subsidiary ray of the axial light beam incident on the exit pupil is almost parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 28, 29, 30, 31, 32, 33, 34)
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13. A decentered optical system having a substantially parallel light beam as an input light, wherein:
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a first, second, and third optical element respectively having a positive power, a negative power, and a positive power are disposed in order along the optical path of the input light, and a decentered reflecting surface having a rotationally asymmetric surface disposed decentered from the optical axis of the input light is provided on the first and second optical element;
a substantially afocal optical system in which an intermediate image is formed on the optical path of the first through third optical elements and an exit pupil is formed on the image side of the third optical element;
a focusing device in which a substantially parallel light beam emitted from the exit pupil forms an image on the light receiving surface is provided on the optical path on the image side of the exit pupil; and
when the plane that includes the input light and the axial principal rays of the light beam reflected by the first and second optical elements serves as the Y-Z plane, the direction in which the axial principal ray progresses from the object side to the reflecting surface of the first optical element serves as the Z-axis, the direction perpendicular to the Z-axis in the Y-Z plane serves as the Y-axis, and the direction perpendicular to the Y-Z plane serves as the X-axis, then the maximum field angle θ
oy in the Y direction on the object side, the maximum field angle θ
ey in the Y direction in the exit pupil, the image height h of the intermediate image, and the diameter of the entrance pupil D0 satisfy the following formula;
1.5<
[{(θ
ey/θ
oy)+2}×
(h/tan θ
ey)]/D0<
10 - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification