Miniature telephoto lens assembly

• US 9,857,568 B2
• Filed: 01/30/2017
• Issued: 01/02/2018
• Est. Priority Date: 07/04/2013
• Status: Active Grant

• Current Assignee: Corephotonics Ltd. (Samsung Electronics Co. Ltd.)
• Original Assignee: Corephotonics Ltd. (Samsung Electronics Co. Ltd.)
• Inventors: Shabtay, Gal, Goldenberg, Ephraim, Dror, Michael
• Primary Examiner(s): Lester, Evelyn A
• Application Number:
  US15/418,925
• Publication Number:
  US 20170146777A1
• Time in Patent Office: 337 Days
• Field of Search: 359714, 359739, 359740, 359763, 359764
• CPC Class Codes: G02B 1/041 Lenses
• CPC Class Codes: G02B 13/002 having at least one aspherical surface
• CPC Class Codes: G02B 13/0045 having five or more lenses
• 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 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 27/646 compensating for small deviations, e.g. due to vibration or shake movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68
• CPC Class Codes: G02B 5/005 Diaphragms for cameras G03B9/02
• CPC Class Codes: G02B 9/00 Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - G02B15/00 takes precedence
• CPC Class Codes: G02B 9/60 having five components only
• CPC Class Codes: H04N 2101/00 Still video cameras
• CPC Class Codes: H04N 2201/00 Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

An optical lens assembly includes five lens elements and provides a TTL/EFL<1.0. In an embodiment, the focal length of the first lens element f1<TTL/2, an air gap between first and second lens elements is smaller than half the second lens element thickness, an air gap between the third and fourth lens elements is greater than TTL/5 and an air gap between the fourth and fifth lens elements is smaller than about 1.5 times the fifth lens element thickness. All lens elements may be aspheric.

Claims

1. A lens assembly, comprising:

a plurality of refractive lens elements arranged along an optical axis with a first lens element on an object side, wherein at least one surface of at least one of the plurality of lens elements is aspheric, wherein the lens assembly has an effective focal length (EFL), a total track length (TTL) of 6.5 millimeters or less, a ratio TTL/EFL of less than 1.0, a F number smaller than 3.2 and a ratio between a largest optical axis thickness L11 and a circumferential edge thickness L1e of the first lens element of L11/L1e<

4.

2. The lens assembly according to claim 1, wherein the ratio L11/L1e<

3.5.

3. The lens assembly according to claim 1, wherein the ratio L11/L1e<

3.2.

4. The lens assembly according to claim 1, wherein the ratio L11/L1e<

3.1.

5. The lens assembly according to claim 1, wherein the ratio L11/L1e<

3.0.