CN-122029376-A - Projection lens and vehicle lamp

Abstract

The invention provides a projection lens and a vehicle lamp, which prevent the degradation of light distribution pattern accuracy and the generation of glare, which are mainly caused by abnormal refraction in the peripheral area of the lens. The projection lens (2) is provided with resin lenses (21-23) arranged in the lens barrel (20) along the direction of the lens optical axis (Lx), and projects light emitted from the light source (30) in a desired light distribution pattern. A light shielding ring (25) is disposed between adjacent lenses (21, 22) along the optical axis direction of the lenses to cover the peripheral edge area of the lenses. The light shielding ring (25) prevents abnormal refraction caused by light passing through a low-precision Area (AL) generated at the peripheral edge parts of the resin molded lenses (21-23), and prevents the precision of the light distribution pattern from being reduced and the glare from being generated.

Inventors

• UCHIDA NAOTO

Assignees

• 株式会社小糸制作所

Dates

Publication Date

20260512

Application Date

20241008

Priority Date

20231019

Claims (9)

1. 1. A projection lens in which a plurality of resin lenses are arranged in a lens barrel in the direction of the optical axis of the lens, and which projects light emitted from a light source in a desired light distribution pattern, The projection lens is provided with a light shielding ring which covers the peripheral edge area of the lens between adjacent lenses along the optical axis direction of the lens.
2. 2. The projection lens according to claim 1, wherein the peripheral edge region of the lens is a region including a low-precision region generated when the lens is resin molded, and the light shielding ring is shaped to cover at least the low-precision region.
3. 3. The projection lens according to claim 1, wherein the lens includes a lens effective region through which light of the light distribution pattern is transmitted, and a flange portion provided at a peripheral edge portion of the lens effective region, and the peripheral edge region of the lens is a region along a boundary between the lens effective region and the flange portion.
4. 4. The projection lens of claim 1 wherein the light shielding ring is configured to shield light to be transmitted through a peripheral region of the lens.
5. 5. The projection lens according to claim 1, wherein the light shielding ring is disposed between adjacent lenses, being sandwiched by the lenses in the lens optical axis direction.
6. 6. The projection lens of claim 1 wherein the projection lens is held to the lens barrel by welding or bonding.
7. 7. A projection lens in which at least one resin lens and at least one glass lens are arranged in a lens barrel in the direction of the optical axis of the lens, wherein light emitted from a light source is projected in a desired light distribution pattern, The projection lens is provided with a light shielding ring which covers the peripheral edge area of the resin lens between adjacent lenses along the optical axis direction of the lens.
8. 8. A vehicle lamp is provided with a light source and a projection lens for projecting light emitted from the light source in a desired light distribution pattern, wherein the projection lens is provided with at least one resin lens, the lens peripheral region of the resin lens includes a low-precision region, and a light shielding ring for covering the peripheral region of the resin lens is arranged between adjacent lenses along the optical axis direction of the lens.
9. 9. The vehicle lamp according to claim 8, wherein the light source is constituted by a plurality of divided light emitting elements in which a plurality of minute light emitting elements are arranged, and the ADB light distribution control is performed by controlling the light emission of the minute light emitting elements.

Description

Projection lens and vehicle lamp Technical Field The present invention relates to a projection lens including a plurality of lenses, and a vehicle lamp suitable for a headlight (headlight) that projects light of a desired light distribution pattern using the projection lens. Background As a headlight of a vehicle such as an automobile, a projection type headlight is proposed in which light from a light source is projected in a desired light distribution pattern by a projection lens. In such a lamp, in order to reduce lens aberration in a projection lens and to improve pattern accuracy of a light distribution pattern, the projection lens may be configured as a compound lens including a plurality of lenses. In order to reduce the weight of the projection lens, a projection lens formed of a resin has been proposed. Patent document 1 describes a projection lens composed of a plurality of lenses formed of resin. However, the resin lens is liable to generate a region (hereinafter referred to as "low-precision region") in which the molding precision of the lens shape is reduced in a peripheral region of the lens, i.e., a circumferential region along the lens circumference in the case of a circular lens, due to "shrinkage", "welding", or the like at the time of mold molding. In such a low-precision region, light refracted by the lens generates abnormal refraction that cannot be refracted as designed. If the abnormal refraction occurs, the headlight causes a problem that the pattern accuracy of the light distribution pattern is lowered. Or the light that generates abnormal refraction becomes a glare that blinds other vehicles. In recent years, a headlight for ADB (ADAPTIVE DRIVING Beam adaptive high Beam) light distribution control has been proposed, which controls light distribution so that other vehicles such as an oncoming vehicle and a preceding vehicle or pedestrians detected from an image or the like captured by a camera do not become dazzled. In order to reduce lens aberrations, such projection lenses for performing ADB light distribution control are often composed of a composite lens composed of a plurality of lenses, and therefore, the number of portions of the composite lens that are abnormally refracted increases, leading to a reduction in pattern accuracy and a significant occurrence of flare. Patent document 1 Japanese patent application laid-open No. 2017-204400 The technology of patent document 1 adopts a structure in which lenses are held by a frame-like holder (also referred to as a lens fitting) that supports peripheral portions of a plurality of lenses. Therefore, it is considered that the lens holder covers the peripheral region of the lens, thereby blocking light having abnormal refraction and solving the technical problem caused by abnormal refraction. However, in such a structure, a plurality of holders for holding a plurality of lenses are required, and a technical problem arises in that the structure of the compound lens becomes complicated. In order to reduce the size and weight of the lamp, it is conceivable to reduce or omit the structure of the holder, for example, to bond or weld the lens to the holder, but in the case of adopting such a structure, the peripheral region of the lens cannot be covered with the holder, and the technical problem caused by abnormal refraction cannot be solved. Disclosure of Invention The present invention aims to provide a projection lens capable of solving a technical problem caused by abnormal refraction in a lens peripheral region and forming a high-precision light distribution pattern which does not generate glare, and a vehicle lamp provided with the projection lens. In the projection lens of the present invention, a plurality of resin lenses are arranged in a lens barrel in the direction of the optical axis of the lens, light emitted from a light source is projected in a desired light distribution pattern, and a light shielding ring for covering the peripheral region of the lens is arranged between adjacent lenses in the direction of the optical axis of the lens. In addition, the projection lens of the present invention is configured such that at least one resin lens and at least one glass lens are arranged in the lens barrel in the lens optical axis direction, light emitted from the light source is projected in a desired light distribution pattern, and a light shielding ring for covering the peripheral edge area of the resin lens is arranged between adjacent lenses in the lens optical axis direction. In the present invention, the peripheral region of the lens is a region including a low-precision region generated when the lens is molded with resin, and the light shielding ring is shaped to cover at least the low-precision region. Preferably, the lens includes a lens effective region through which light of the light distribution pattern is transmitted, and a flange portion provided at a peripheral edge portion of the lens effective region, and the peri