US 9,753,245 B2Granted

Optical lens device

AssigneeDenso Corporation

InventorsYasuki Furutake, Toshihiko Takahata

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Abstract

An optical lens device forms a condenser lens having a first lens of a positive focal length and a second lens of a negative focal length. The first and second lenses are stacked with their optical axis aligned. The first lens has a lens section, edge section and glass member having a linear expansion coefficient smaller than that of the lens section and the edge section to suppress shape change of the first lens due to temperature change of the first lens. The second lens, which is stacked with the first lens, is used for offsetting a change of the positive focal length generated in the first lens when the temperature varies. The glass member having a small linear expansion coefficient suppresses that shape change of the first lens which is not compensated by the second lens.

Claims15

Dependent claims

An optical lens device forming a condenser lens, comprising:

a first lens having a positive focal length, the first lens further comprising a first convex lens section, a first edge section and a first member, the first edge section surrounding an outer periphery of the first convex lens section;
and
a second lens having a negative focal length, the second lens further comprising a second concave lens section and a second edge section, the second edge section surrounding an outer periphery of the second concave lens section,
wherein the first lens is positioned over the second lens such that surfaces of the first edge section and the second edge section are in contact and an optical axis of the first lens and an optical axis of the second lens are aligned with each other, and
wherein the first member of the first lens has a linear expansion coefficient that is smaller than a linear expansion coefficient of a remaining part excepting the first member in the first lens so as to suppress a shape change of the first lens due to a temperature change of the first lens.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/904,012Filed 26 Jun 2014
Priority: JP 2013-1438419 Jul 2013
Published: US 2016/0154201 A12 Jun 2016
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G02B 7/028
For lenses: with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
G02B 7/025
For lenses: using glue
G02B 9/10
Having two components only: one + and one - component
G02B 13/003
Having at least one aspherical surface: having two lenses

Family

US 2016/0154201 A1Pre-grant publication · published 2 Jun 2016
US 9,753,245 B2This patent

From the US filing history. Foreign family members aren’t listed.

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