Optical lens assembly
US-9857557-B1 · Jan 2, 2018 · US
Vehicle lamp
US10753563B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10753563-B2 |
| Application number | US-201916278877-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 19, 2019 |
| Priority date | Feb 22, 2018 |
| Publication date | Aug 25, 2020 |
| Grant date | Aug 25, 2020 |
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- Title
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Abstract
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A vehicle lamp includes a light source, and a projection lens which is configured to project light emitted from the light source. The projection lens includes two or more resin lenses and one or more glass lenses, and a refractive power ratio R (=Pr/Pt) of a total refractive power Pr of the resin lenses to a refractive power Pt of the entire projection lens satisfies a relationship of R<⅓.
First claim
Opening claim text (preview).
The invention claimed is: 1. A vehicle lamp comprising: a light source; and a projection lens configured to project light emitted from the light source, wherein the projection lens includes two or more resin lenses and one or more glass lenses, and a refractive power ratio R (=Pr/Pt) of a total refractive power Pr of the resin lenses to a refractive power Pt of the entire projection lens satisfies a relationship of R<⅓, wherein the projection lens is a triplet lens including a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, in an order from a side opposite to the light source, the first lens and second lens are formed of resin, and the third lens is formed of glass. 2. The vehicle lamp according to claim 1 , wherein the first lens and the second lens are formed of resin having substantially the same thermal expansion coefficient. 3. The vehicle lamp according to claim 1 , wherein light from the light source is projected and an ADB light distribution control is performed. 4. A vehicle lamp comprising: a light source; and a projection lens configured to project light emitted from the light source, wherein the projection lens includes two or more resin lenses and one or more glass lenses, and a refractive power ratio R (=Pr/Pt) of a total refractive power Pr of the resin lenses to a refractive power Pt of the entire projection lens satisfies a relationship of R<⅓, and wherein the projection lens includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a positive refractive power in an order from a side opposite to the light source, the first lens and the second lens are formed of resin, and the third lens and the fourth lens are formed of glass. 5. The vehicle lamp according to claim 4 , wherein the first lens and the second lens are formed of resin having substantially the same thermal expansion coefficient. 6. The vehicle lamp according to claim 4 , wherein light from the light source is projected and an ADB light distribution control is performed.
Assignees
Inventors
Classifications
the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions · CPC title
Light-emitting diodes [LED] · CPC title
for land vehicles · CPC title
by switching light sources (by switching incandescent light sources F21S41/162) · CPC title
- F21S41/25Primary
Projection lenses · CPC title
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Frequently asked questions
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- What does patent US10753563B2 cover?
- A vehicle lamp includes a light source, and a projection lens which is configured to project light emitted from the light source. The projection lens includes two or more resin lenses and one or more glass lenses, and a refractive power ratio R (=Pr/Pt) of a total refractive power Pr of the resin lenses to a refractive power Pt of the entire projection lens satisfies a relationship of R<⅓.
- Who is the assignee on this patent?
- Koito Mfg Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F21S41/25. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 25 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).