Optical lens device

Patent metadata

Field	Value
Publication number	US-9753245-B2
Application number	US-201414904012-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jul 9, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

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.

First claim

The invention claimed is:

1. 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. The optical lens device according to claim 1 , wherein
the first member is embedded within the first edge section.

3. The optical lens device according to claim 2 , wherein
the first member is formed within the first edge section and has a transmittance that is smaller than a transmittance of the first convex lens section and a transmittance of the first edge section in the first lens so as to limit incident light received by the first lens.

4. The optical lens device according to claim 2 , wherein
an adhesive is applied on the surfaces of the first edge section and the second edge section on which the first lens and the second lens are stacked together and in contact with each other, and
the adhesive is made of a member having a linear expansion coefficient that is greater than a linear expansion coefficient of the second lens so as to promote a shape change of the second lens due to a temperature change of the second lens.

5. The optical lens device according to claim 2 , wherein
a surface of each of the first edge section and the second edge section in a direction along which the first lens and the second lens are stacked together has a plate shape.

6. The optical lens device according to claim 2 , wherein
the second lens comprises a second member having a linear expansion coefficient that is greater than a linear expansion coefficient of a remaining part excepting the second member in the second lens so as to promote a shape change of the second lens due to temperature change of the second lens so that the second member is formed in a section of the second lens excepting surfaces of the second lens.

7. The optical lens device according to claim 1 , wherein
an entirety of the first edge section is formed from the first member.

8. The optical lens device according to claim 7 , wherein
the first member is formed within the first edge section and has a transmittance that is smaller than a transmittance of the first convex lens section and a transmittance of the first edge section in the first lens so as to limit incident light received by the first lens.

9. The optical lens device according to claim 7 , wherein
an adhesive is applied on surfaces of the first edge section and the second edge section on which the first lens and the second lens are stacked together and in contact with each other, and
the adhesive is made of a member having a linear expansion coefficient that is greater than a linear expansion coefficient of the second lens so as to promote a shape change of the second lens due to a temperature change of the second lens.

10. The optical lens device according to claim 7 , wherein
a surface of each of the first edge section and the second edge section in a direction along which the first lens and the second lens are stacked together has a plate shape.

11. The optical lens device according to claim 7 , wherein
the second lens comprises a second member having a linear expansion coefficient that is greater than a linear expansion coefficient of a remaining part excepting the second member in the second lens so as to promote a shape change of the second lens due to temperature change of the second lens so that the second member is formed in a section of the second lens excepting surfaces of the second lens.

12. The optical lens device according to claim 1 , wherein
an adhesive is applied on the surfaces of the first edge section and the second edge section on which the first lens and the second lens are stacked together and in contact with each other, and
the adhesive is made of a member having a linear expansion coefficient that is greater than a linear expansion coefficient of the second lens so as to promote a shape change of the second lens due to a temperature change of the second lens.

13. The optical lens device according to claim 1 , wherein
a surface of each of the first edge section and the second edge section in a direction along which the first lens and the second lens are stacked together has a plate shape.

14. The optical lens device according to claim 1 , wherein
the second lens comprises a second member having a linear expansion coefficient that is greater than a linear expansion coefficient of a remaining part excepting the second member in the second lens so as to promote a shape change of the second lens due to temperature change of the second lens so that the second member is formed in a section of the second lens excepting surfaces of the second lens.

15. 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, a second edge section and a second member, the second edge section surrounding an outer periphery of the second concave lens section, and the second member being formed in the second edge 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 second member of the second lens has a linear expansion coefficient that is greater than a linear expansion coefficient of a remaining part excepting the second member in the second lens so as to promote a shape change of the second lens due to a temperature change of the second lens.

Assignees

• Denso Corp

Inventors

• Furutake Yasuki
• Takahata Toshihiko

Classifications

• G02B7/025

  using glue · CPC title

• G02B7/028 Primary

  with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation · CPC title

• G02B13/003

  having two lenses · CPC title

• G02B9/10

  one + and one - component · CPC title

• G02B19/0014

  at least one surface having optical power · CPC title