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US 12,727,744 B2Granted
Beam-shaping lens, beam-shaping element, light source device for an endoscope, and endoscope
AssigneesSumita Optical Glass, Inc., Nirec Corporation
InventorsJun Otake, Hiroki Watanabe, Eiji Ototsuki, Yuichi Takenaga
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Abstract
A beam-shaping lens includes a first surface including a smooth-shaped concave surface; and a second surface including a convex surface substantially similar in shape to the concave surface. The beam-shaping lens converts a first light beam that is parallel light incident on the first surface and having a light intensity distribution that continuously increases from an outer periphery toward a center, into a second light beam that has a flatter light intensity distribution than that of the first light beam.
Claims9
A light source device for an endoscope comprising:
- a first light source unit;
- a first collimating optical system that converts light emitted from the first light source unit into a first light beam that is parallel light;
- and
- a first beam-shaping lens comprising a first surface comprising a smooth-shaped concave surface and a second surface comprising a convex surface substantially similar in shape to the concave surface, the first beam-shaping lens converting the first light beam incident on the first surface and having a light intensity distribution that continuously increases from an outer periphery toward a center, into a second light beam that has a flatter light intensity distribution than that of the first light beam,
- wherein the first collimating optical system comprises a zoom optical system comprising a first lens having a negative refractive power and a second lens having a positive refractive power, and configured to adjust positions of the first lens and the second lens in conjunction with each other.
2 more elements
Dependencies are inferred from the claim text.