ON-VEHICLE CAMERA LENS GLASS MATERIAL AND ON-VEHICLE CAMERA LENS

• US 20080231972A1
• Filed: 03/19/2008
• Published: 09/25/2008
• Est. Priority Date: 03/20/2007
• Status: Active Grant

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: HACHITANI, Yoichi, TACHIWANA, Kazuo
• Granted Patent: US 8,077,406 B2
• Time in Patent Office: Days
• US Class Current: 359/809
• CPC Class Codes: B60R 2300/802 for monitoring and displaying vehicle exterior blind spot views
• CPC Class Codes: C03C 3/068 containing rare earths
• CPC Class Codes: C03C 3/097 containing phosphorus, niobium or tantalum

Abstract

An on-vehicle camera lens glass material satisfies at least one of conditions in which a measurement result in water resistance based on a powder method prescribed by Japanese Optical Glass Industrial Standard is 1^st Class, a measurement result in Knoop hardness based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 6^th Class or higher, a measurement result in solarization based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 2% or less, and a measurement result in average linear expansion coefficient based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 100×10⁻⁷° C.⁻¹ or less.

Claims

1. An on-vehicle camera lens glass material used for an on-vehicle camera lens, wherein a measurement result in acid resistance based on a powder method prescribed by Japanese Optical Glass Industrial Standard is 1^st Class or 2^nd Class.

2. The on-vehicle camera lens glass material according to claim 1,

wherein the material satisfies at least one of following conditions:

a measurement result in water resistance based on a powder method prescribed by Japanese Optical Glass Industrial Standard is 1^st Class;

a measurement result in Knoop hardness based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 6^th Class or higher;

a measurement result in solarization based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 2% or less; and

a measurement result in average linear expansion coefficient based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 100×

10<sup>−

7</sup>°

C.<sup>−

1</sup> or less.

3. The on-vehicle camera lens glass material according to claim 1, wherein a total content of SiO₂ and ZrO₂ is 10% by weight or more.

4. The on-vehicle camera lens glass material according to claim 1, wherein the material includes transparent crystallized glass.

5. The on-vehicle camera lens glass material according to claim 1, wherein a content of SiO₂ is 60% by weight or more.

6. The on-vehicle camera lens glass material according to claim 1, wherein a total content of TiO₂, Nb₂O₅, Ta₂O₅, and ZrO₂ is 20% by weight or more.

7. The on-vehicle camera lens glass material according to claim 1, wherein the material contains:

0.1 to 45% by weight of SiO₂;

0.1 to 25% by weight of B₂O₃;

0.1 to 20% by weight of ZrO₂;

0 to 50% by weight of La₂O₃; and

to 30% by weight of Nb₂O₅.

8. The on-vehicle camera lens glass material according to claim 7, wherein the material further contains:

at least one of Al₂O₃, Li₂O, Na₂O, K₂O, MgO, CaO, SrO, BaO, ZnO, TiO₂, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, WO₃, Sb₂O₃, SnO₂, and F.

9. The on-vehicle camera lens glass material according to claim 1, wherein a refractive index with respect to line d is 1.70 or more.

12. An on-vehicle camera lens, wherein at least a first lens close to an object point is made of the on-vehicle camera lens glass material according to claim 1.

14. The on-vehicle camera lens according to claim 12, wherein a photocatalytic film is formed on at least a first surface, which is close to the object point, of the first lens.

16. The on-vehicle camera lens according to claim 12, wherein a hard coat film is formed on at least a first surface, which is close to the object point, of the first lens.

18. The on-vehicle camera lens according to claim 12, wherein a hard coat film and a photocatalytic film are formed on at least a first surface, which is close to the object point, of the first lens.

20. The on-vehicle camera lens according to claim 12, wherein at least one surface of the lens is formed as an aspheric surface.

10. An on-vehicle camera lens glass material used for an on-vehicle camera lens, wherein

a total content of TiO₂ and Nb₂O₅ is in a range of 0.1 to 0.3% by weight, and/or

a total content of CeO₂ and Fe₂O₃ is in a range of 0.1 to 1% by weight.

11. The on-vehicle camera lens glass material according to claim 10, wherein a refractive index with respect to line d is 1.70 or more.

13. An on-vehicle camera lens, wherein at least a first lens close to an object point is made of the on-vehicle camera lens glass material according to claim 10.

15. The on-vehicle camera lens according to claim 13, wherein a photocatalytic film is formed on at least a first surface, which is close to the object point, of the first lens.

17. The on-vehicle camera lens according to claim 13, wherein a hard coat film is formed on at least a first surface, which is close to the object point, of the first lens.

19. The on-vehicle camera lens according to claim 13, wherein a hard coat film and a photocatalytic film are formed on at least a first surface, which is close to the object point, of the first lens.

21. The on-vehicle camera lens according to claim 13, wherein at least one surface of the lens is formed as an aspheric surface.