Light projection lens and mobile object

The light projection lens addresses the issue of non-uniform illumination in conventional vehicle lighting by shaping the light distribution to achieve a uniform and elongated light pattern on the road surface using a concave and diffusion section.

DE102020100417B4Active Publication Date: 2026-06-11PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2020-01-10
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Conventional lighting devices for mobile objects, such as vehicles, fail to illuminate road surfaces uniformly and often produce non-uniform light distribution, especially when integrated into side mirrors, which are elongated in shape.

⚗Method used

A light projection lens that controls light distribution to achieve a long, uniform light intensity on the road surface by using a concave section and diffusion section to shape the light emitted from a light source, such as an LED, ensuring even illumination.

🎯Benefits of technology

The light projection lens ensures that the light emitted has a long shape and uniform intensity on the illuminated surface, effectively addressing the non-uniformity issues of conventional lighting devices.

✦ Generated by Eureka AI based on patent content.

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Abstract

Light projection lens (130), comprising: an inner surface (131) at which light emitted from a light source (120) enters and which includes a first concave section (133) that is recessed in a direction in which the light emitted from the light source (120) enters; and an outer surface (132) from which the light that entered at the inner surface (131) exits, wherein in a cross-section parallel to an optical axis of the light emitted by the light source (120) the outer surface (132) and the first concave section (133) contained in the inner surface (131) have a difference in the radius of curvature in at least one section of the outer surface (132) and the first concave section (133), wherein in a cross-section perpendicular to the optical axis of the light emitted by the light source (120) the first concave section (133) has an elliptical shape, wherein the light exiting the outer surface (132) is less in quantity in one direction of the optical axis of the light emitted by the light source (120) than in a direction different from the direction of the optical axis, and wherein in a cross-section of the light projection lens (130), which is taken along a longitudinal axis direction of the first concave section (133), which has an elliptical shape as seen from the optical axis direction of the light projection lens (130), (i) the optical axis of the light projection lens (130) is defined as the Z1 axis, (ii) a direction from the outer surface (132) of the light projection lens (130) to the inner surface (131) of the light projection lens (130) is defined as the positive direction of the Z1 axis, (iii) a direction perpendicular to the Z1 axis is defined as the Y1 axis and (iv) a direction from a central section of the light projection lens (130) to an edge of the first concave section (133) of the light projection lens (130) is defined as the positive direction of the Y1 axis, where a value of a second derivative of a virtual curve Z1 = f(Y1), corresponding to the first concave section (133) in the inner surface (131) of the light projection lens (130), is positive in the central section of the light projection lens (130) within a positive region of the Y1 axis and decreases monotonically from the central section of the light projection lens (130) to the edge of the light projection lens (130), and the radius of curvature of the outer surface (132) is unchanging regardless of the position.
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