# US 12,601,895 B2 · Imaging lens system and imaging device

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- Number: US 12,601,895 B2
- Document ID: US12601895B2
- Status: Granted
- Kind: B2
- Application number: 18/196,482
- Filed: 2023-05-12
- Published: 2023-09-07
- Granted: 2026-04-14
- Earliest claimed: 2017-11-10
- Assignees: Maxell, Ltd.
- Applicants: Maxell, Ltd.
- Inventors: Yutaka Makino; Takashi Sugiyama
- Web page: https://patentgrep.com/patent/US12601895B2

## CPC

- G02B 13/0035: {having three lenses}
- G02B 9/12: having three components only
- G02B 9/60: having five components only
- G02B 13/0045: {having five or more lenses}
- G02B 13/04: Reversed telephoto objectives
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens system and an imaging device capable of capturing a long-distance image in a central direction of an optical axis with high resolution and capturing a neighborhood image at a wide angle. An imaging lens system includes, in order from an object side: a first lens group including at least a first lens, a second lens, and a third lens; an aperture stop (STOP); and a second lens group including two or more lens and having a positive combined power, an image side of the first lens has a concave surface, a combined focal length of the first lens and the second lens is negative, the third lens is a lens having a positive power, an object side of the first lens has an aspherical surface, and an incident-side surface (object side) of the first lens has an inflection point.

## Claims

### Claim 1

An imaging lens system comprising, in order from an object side:
a front group including a first lens, and a second lens;
an aperture stop; and
a rear group including a third lens, a fourth lens, a fifth lens a sixth lens and a seventh lens and having a positive combined power, wherein
an image side of the first lens has a concave surface facing an image side of the imaging lens system,
a combined power of the first lens and the second lens is negative,
the third lens has a positive power,
an object side of the first lens has an aspherical surface,
an incident-side surface of the first lens, which is on the object side, has an inflection point,
the second lens has a negative power, and
the imaging lens system satisfies
0.31≤L1H/L1R≤0.65, where
L1H is a distance from an optical axis to the inflection point in a direction perpendicular to the optical axis of the first lens, and
L1R is an effective radius of the incident-side surface of the first lens.

### Claim 2 (depends on 1)

The imaging lens system according to claim 1, wherein
the first lens is closest to an object side in the front group, and
the imaging lens system satisfies
0.03≤L1SAG/L1R, where
L1SAG is sag amount at the inflection point on the incident-side surface of the first lens.

### Claim 3 (depends on 1)

The imaging lens system according to claim 1, wherein the imaging lens system satisfies
L1N≥1.75
where L1N is a refractive index of the first lens at a d-line.

### Claim 4 (depends on 1)

The imaging lens system according to claim 1, wherein the imaging lens system has an angle of view of 80 degrees or more.

### Claim 5 (depends on 1)

The imaging lens system according to claim 1, wherein the first lens is a concave meniscus lens having a convex shape on the object side facing the object side of the imaging lens system.

### Claim 6 (depends on 1)

The imaging lens system according to claim 1, wherein the imaging lens system satisfies
L1V≥38
where L1V is an Abbe number of the first lens at a d-line.

### Claim 7 (depends on 1)

The imaging lens system according to claim 1, wherein an image side of the seventh lens in the rear group is an aspherical surface having a concave shape facing the object side of the imaging lens system.

### Claim 8 (depends on 1)

The imaging lens system according to claim 1, wherein a lens closest to an object side in the rear group is the third lens and has a positive power.

### Claim 9 (depends on 1)

The imaging lens system according to claim 1, wherein the rear group includes a cemented lens.

### Claim 10 (depends on 1)

An imaging device comprising:
an imaging lens system according to claim 1; and
an imaging element for capturing an image formed in the imaging lens system.