# US 12,000,996 B2 · Low total track length lens assembly including seven lenses of +−+−++− refractive powers for large sensor format

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- Number: US 12,000,996 B2
- Document ID: US12000996B2
- Status: Granted
- Kind: B2
- Application number: 18/314,936
- Filed: 2023-05-10
- Published: 2023-11-16
- Granted: 2024-06-04
- Earliest claimed: 2019-08-21
- Assignees: Corephotonics Ltd.
- Applicants: Corephotonics Ltd.
- Inventors: Roy Rudnick; Michael Dror; Ephraim Goldenberg
- Web page: https://patentgrep.com/patent/US12000996B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/64: having more than six components
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Lens assemblies comprising from an object side to an image side, seven lens elements numbered L1-L7; an optical window; and an image sensor having a sensor diagonal length (SDL), wherein an exemplary lens assembly has a total track length TTL that includes the optical window an effective focal length EFL and a field of view (FOV), wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein FOV<90 degrees, wherein a normalized thickness standard deviation constant T_STD of at least four of the seven lens elements complies with T_STD<0.035, and wherein a focal length f1 of lens element L1 fulfills f1/EFL<0.95.

## Claims

### Claim 1

A lens assembly comprising: from an object side to an image side,
seven lens elements numbered L1-L7;
an optical window; and
an image sensor having a sensor diagonal length (SDL),
wherein the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view (FOV)<90 degrees, wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein a normalized thickness standard deviation constant T_STD of four of the seven lens elements complies with T_STD≤0.02971, wherein a focal length f1 of lens element L1 fulfills f1/EFL<0.95 and wherein lens element L1 is convex on the object side, and wherein TTL/SDL<0.63.

### Claim 2 (depends on 1)

The lens assembly of claim 1, wherein each element has a clear aperture (CA) and wherein a CA of lens elements L3 or L4 is the smallest of all CAs in the lens assembly.

### Claim 3 (depends on 1)

The lens assembly of claim 1, wherein TTL/EFL<1.090.

### Claim 4 (depends on 1)

The lens assembly of claim 1, wherein TTL/EFL<1.083.

### Claim 5 (depends on 1)

The lens assembly of claim 1, wherein TTL/SDL<0.61.

### Claim 6 (depends on 1)

The lens assembly of claim 1, wherein a central thickness CT of at least 6 of the 7 lens elements complies CT/TTL<0.07.

### Claim 7 (depends on 1)

The lens assembly of claim 1, wherein the T_STD of at least 5 of the 7 lens elements complies with T_STD≤0.064714.

### Claim 8 (depends on 1)

The lens assembly of claim 1, wherein the T_STD of at least 5 of the 7 lens elements complies with T_STD≤0.043499.

### Claim 9 (depends on 1)

The lens assembly of claim 1, wherein f1/EFL<0.9.

### Claim 10 (depends on 1)

The lens assembly of claim 1, wherein f1/EFL<0.85.

### Claim 11

A lens assembly comprising: from an object side to an image side,
seven lens elements numbered L1-L7;
an optical window; and
an image sensor having a sensor diagonal length (SDL),
wherein the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view (FOV)<90 degrees, wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein a normalized thickness standard deviation constant T_STD of four of the seven lens elements complies with T_STD≤0.02971, wherein a focal length f1 of lens element L1 fulfills f1/EFL<0.95, wherein lens element L1 is convex on the object side, and wherein a focal length f5 of lens element L5 fulfills |f5/EFL|>4.0.

### Claim 12 (depends on 11)

The lens assembly of claim 11, wherein a focal length f5 of lens element L5 fulfills |f5/EFL|>6.0.

### Claim 13 (depends on 11)

The lens assembly of claim 11, wherein a focal length f5 of lens element L5 fulfills |f5/EFL|>8.0.

### Claim 14 (depends on 1)

The lens assembly of claim 1, wherein a focal length f6 of lens element L6 fulfills f6/EFL|>15.0.

### Claim 15 (depends on 1)

The lens assembly of claim 1, wherein a focal length f6 of lens element L6 fulfills f6/EFL|>30.0.

### Claim 16 (depends on 1)

The lens assembly of claim 1, wherein a focal length f6 of lens element L6 fulfills f6/EFL|>45.0.

### Claim 17 (depends on 1)

The lens assembly of claim 1, wherein a normalized gap standard deviation constant G_STD of a gap between lens elements L1 and L2 complies with G_STD=0.005903.

### Claim 18 (depends on 1)

The lens assembly of claim 1, wherein SDL=12 mm and wherein FOV<82.1 degrees.

### Claim 19

A lens assembly comprising: from an object side to an image side,
seven lens elements numbered L1-L7, wherein the lens elements have, starting with lens element L1, a power sign sequence of positive-negative-positive-negative-positive-positive-negative;
an optical window; and
an image sensor having a sensor diagonal length (SDL),
wherein the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view (FOV)<90 degrees, wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein a normalized thickness standard deviation constant T_STD of four of the seven lens elements complies with T_STD≤0.02971, and wherein a focal length f1 of lens element L1 fulfills f1/EFL<0.95 and wherein lens element L1 is convex on the object side.