Image Capture Device and Converter Lens Assembly Thereof

• US 20140168500A1
• Filed: 11/22/2013
• Published: 06/19/2014
• Est. Priority Date: 12/19/2012
• Status: Active Grant

• Current Assignee: Asia Optical International Limited (Asia Optical Company Incorporated), Sintai Optical Company Limited (Asia Optical Company Incorporated)
• Original Assignee: Asia Optical International Limited (Asia Optical Company Incorporated), Sintai Optical Company Limited (Asia Optical Company Incorporated)
• Inventors: Chen, Ming-Chung
• Granted Patent: US 9,268,117 B2
• Time in Patent Office: Days
• US Class Current: 348/345
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/009 having zoom function
• CPC Class Codes: G02B 13/18 with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration G02B13/002 takes precedence
• CPC Class Codes: G02B 9/60 having five components only

Abstract

An image capture device and a converter lens assembly thereof are provided. The image capture device includes a mobile phone and the converter lens assembly wherein the converter lens assembly is connected to the mobile phone. The converter lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power. The fourth lens is with positive refractive power. The converter lens assembly satisfies the condition: 1<|f₁/f₂|<2 and/or the condition: 1<|f₃₄₅/f₂|<2, wherein f₁ is the effective focal length of the first lens, f₂ is the effective focal length of the second lens, f₃₄₅ is the effective focal length of the combination of the third lens, the fourth lens and the fifth lens.

Claims

1. A converter lens assembly comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis, wherein:

the first lens is with positive refractive power;

the fourth lens is with positive refractive power; and

the converter lens assembly satisfies;

1<

|f₁/f₂|<

2 and/or 1<

|f₃₄₅/f₂|<

2 wherein f₁ is an effective focal length of the first lens, f₂ is an effective focal length of the second lens, and f₃₄₅ is an effective focal length of the combination of the third lens, the fourth lens and the fifth lens.

2. The converter lens assembly as claimed in claim 1, wherein the second lens is with negative refractive power and the third lens is with positive refractive power.

3. The converter lens assembly as claimed in claim 1, wherein the second lens is with positive refractive power and the third lens is with negative refractive power.

4. The converter lens assembly as claimed in claim 1, wherein the fifth lens is with positive refractive power.

5. The converter lens assembly as claimed in claim 1, wherein the fifth lens is with negative refractive power.

6. The converter lens assembly as claimed in claim 1, wherein the first lens is a biconvex lens, the second lens is a biconcave lens with negative refractive power, the third lens is a biconvex lens with positive refractive power, the fourth lens is a biconvex lens and the fifth lens is a convex-concave lens with negative refractive power.

7. The converter lens assembly as claimed in claim 1, wherein the first lens is a concave-convex lens, the second lens is a biconcave lens with negative refractive power, the third lens is a biconvex lens with positive refractive power, the fourth lens is a biconvex lens and the fifth lens is a convex-concave lens with positive refractive power.

8. The converter lens assembly as claimed in claim 1, wherein the first lens comprises two surfaces, at least one of which is an aspheric surface or both of which are aspheric surfaces.

9. The converter lens assembly as claimed in claim 1, wherein the second lens comprises two surfaces, at least one of which is an aspheric surface or both of which are aspheric surfaces.

10. The converter lens assembly as claimed in claim 1, wherein the third lens comprises two surfaces, at least one of which is an aspheric surface or both of which are aspheric surfaces.

11. The converter lens assembly as claimed in claim 1, wherein the third lens comprises two surfaces, both of which are spherical surfaces.

12. The converter lens assembly as claimed in claim 1, wherein the fourth lens comprises two surfaces, at least one of which is an aspheric surface or both of which are aspheric surfaces.

13. The converter lens assembly as claimed in claim 1, wherein the fifth lens comprises two surfaces, at least one of which is an aspheric surface or both of which are aspheric surfaces.

14. An image capture device comprising a mobile phone and the converter lens assembly as claimed in claim 1, wherein:

the converter lens assembly comprises a end, and the end is connected to the mobile phone.

15. The image capture device as claimed in claim 14, further comprising a zoom lens, wherein the zoom lens comprises an end, and the end is connected to the converter lens assembly.