OBJECTIVE LENS FOR ENDOSCOPIC DEVICE, ACTUATOR FOR FOCUSING, AND ENDOSCOPIC SYSTEM
First Claim
Patent Images
1. An objective lens for an endoscope, the objective lens comprising;
- a plurality of lenses;
a stop; and
an optical element disposed adjacent to the stop,wherein a focal length of the objective lens is variable according to a movement of the optical element in a direction different from an optical axis of the plurality of lenses.
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Accused Products
Abstract
An objective lens for an endoscope, an actuator for focusing the objective lens, and an endoscope system including the objective lens are provided. The objective lens for an endoscope includes a plurality of lenses and a stop, and an optical element disposed adjacent to the stop, wherein a focal length may be varied by moving the optical element in a direction different from an optical axis.
109 Citations
36 Claims
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1. An objective lens for an endoscope, the objective lens comprising;
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a plurality of lenses; a stop; and an optical element disposed adjacent to the stop, wherein a focal length of the objective lens is variable according to a movement of the optical element in a direction different from an optical axis of the plurality of lenses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An objective lens for an endoscope, comprising, sequentially from an object side of the objective lens, a front lens group having a negative refractive power, a stop, a rear lens group having a positive refractive power, and an optical element disposed between the front lens group and the stop or between the stop and the rear lens group,
wherein the optical element is moveable in a direction different from an optical axis to focus the objective lens, and the front lens group includes a first lens having a negative refractive power and a second lens having a positive refractive power, and the rear lens group includes a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power, wherein the objective lens satisfies the following equation: -
0.8≦
|ds/fG1|≦
1.8
<
Equation>where ds denotes a distance between a vertex of the first lens at the object side and the stop, and fG1 denotes a focal length of the front lens group. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An actuator for moving an optical element to focus an objective lens for an endoscope, comprising:
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a moveable holder to support the optical element; at least one guide hole formed in the holder; at least one guide shaft disposed in the at least one guide hole to guide a movement of the holder; and a driving unit to move the holder. - View Dependent Claims (26)
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27. An endoscope system comprising:
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a bending portion having a terminal end; an objective lens disposed at the terminal end of the bending portion; and an inserting portion connected to the bending portion at an end of the bending portion opposite the terminal end, wherein the objective lens includes a plurality of lenses, a stop, and an optical element disposed adjacent to the stop, and a focal length of the objective lens is variable according to a movement the optical element in a direction different from an optical axis of the plurality of lenses. - View Dependent Claims (28)
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29. An endoscope system comprising:
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a bending portion having a terminal end; an objective lens disposed at the terminal end of the bending portion; and an inserting portion connected to the bending portion at an end of the bending portion opposite the terminal end, wherein the objective lens comprises, sequentially from an object side of the objective lens, a front lens group having a negative refractive power, a stop, a rear lens group having a positive refractive power, and an optical element disposed between the front lens group and the stop or between the stop and the rear lens group, wherein the optical element is moveable in a direction different from an optical axis to focus the objective lens, and the front lens group includes a first lens having a negative refractive power and a second lens having a positive refractive power, and the rear lens group includes a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power, wherein the objective lens satisfies the following equation;
0.8≦
|ds/fG1|≦
1.8
<
Equation>where ds denotes a distance between a vertex of the first lens at the object side and the stop, and fG1 denotes a focal length of the front lens group. - View Dependent Claims (30, 31)
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32. An objective lens usable with an endoscope, comprising:
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a front lens group having a negative refractive power; a rear lens group having a positive refractive power; a stop disposed between the front and rear lens group; and an optical element disposed between the front lens group and the stop or between the stop and the rear lens group, the optical element being moveable in a direction different from an optical axis of the front lens group and the rear lens group wherein the front lens group, sequentially from an object side of the objective lens, further comprises a first lens having a negative refractive power and a second lens having a positive refractive power. - View Dependent Claims (33, 34, 35, 36)
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Specification