TELECONVERTER LENS AND ELECTRONIC DEVICE INCLUDING SAME

• US 20190317299A1
• Filed: 12/15/2017
• Published: 10/17/2019
• Est. Priority Date: 12/26/2016
• Status: Active Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Chang-keun
• Application Number:
  US16/468,726
• Publication Number:
  US 20190317299A1
• Time in Patent Office: Days
• CPC Class Codes: G02B 13/004 having four lenses
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/006 at least one element being a compound optical element, e.g. cemented elements
• CPC Class Codes: G02B 13/02 Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
• CPC Class Codes: G02B 15/06 by changing the front part
• CPC Class Codes: G02B 27/00 Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
• CPC Class Codes: G02B 9/34 having four components only
• CPC Class Codes: G02B 9/60 having five components only

Abstract

A tele-converter lens and an electronic device are provided. The tele-converter lens mounted at an object side of a main photographing lens includes: a first lens having a positive refractive power; a second lens having a refractive power and having at least one aspherical surface; and at least one lens having a refractive power, wherein the first lens, the second lens, and the at least one lens are sequentially arranged from the object side toward the main photographing lens.

Claims

1. A tele-converter lens mounted at an object side of a main photographing lens, the tele-converter lens comprising:

a first lens having a positive refractive power;

a second lens having a refractive power and having at least one aspherical surface; and

at least one lens having a refractive power,

wherein the first lens, the second lens, and the at least one lens are sequentially arranged from the object side toward the main photographing lens.

2. The tele-converter lens of claim 1, satisfying the following condition:

1.5<

TT/1stY<

2.0,

where TT denotes a total thickness on an optical axis of the tele-converter lens and 1stY denotes an effective diameter of the first lens.

3. The tele-converter lens of claim 1, satisfying the following condition:

0<

AT/LT<

0.45,

where AT denotes a sum of distances between lenses included in the tele-converter lens and LT denotes a sum of thicknesses of the lenses included in the tele-converter lens.

4. The tele-converter lens of claim 1, satisfying the following condition:

1.4≤

TEFL/EFLD≤

2.2

where EFLD denotes a focal length of the main photographing lens and TEFL denotes a focal length of an entire optical system including the tele-converter lens and the main photographing lens.

5. The tele-converter lens of claim 1, wherein the first lens has a meniscus shape of which object side surface is convex.

6. The tele-converter lens of claim 1, wherein a material of the second lens comprises a plastic resin.

7. The tele-converter lens of claim 1, wherein the second lens has a positive refractive power and has a meniscus shape of which object side surface is convex.

8. The tele-converter lens of claim 7, wherein the at least one lens comprises:

a third lens having a negative refractive power; and

a fourth lens having a positive refractive power.

9. The tele-converter lens of claim 8, wherein the third lens has a concave surface toward the main photographing lens, and an object side surface of the fourth lens is convex.

10. The tele-converter lens of claim 8, wherein the at least one lens further comprises a fifth lens located between the fourth lens and the main photographing lens, the fifth lens having a negative refractive power.

11. The tele-converter lens of claim 10, wherein the fourth lens has a convex surface toward the main photographing lens and an object side surface of the fifth lens is concave,

wherein the fourth lens and the fifth lens are cemented to each other to form a cemented lens.

12. The tele-converter lens of claim 1, wherein the second lens has a negative refractive power.

13. The tele-converter lens of claim 12, wherein the at least one lens comprises:

a third lens having a positive refractive power;

a fourth lens having a negative refractive power; and

a fifth lens having a positive refractive power.

14. The tele-converter lens of claim 13, wherein the third lens has a biconvex shape and the fourth lens has a biconcave shape,

wherein the third lens and the fourth lens are cemented to each other to form a cemented lens.

15. An electronic device comprising:

a photographing lens including at least one lens;

a tele-converter lens according to claim 1, the tele-converter lens being located at an object side of the photographing lens; and

an image sensor configured to convert an optical image formed by an optical system including the tele-converter lens and the photographing lens into an electric signal.