# US 12,181,632 B2 · Imaging device and imaging apparatus

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- Number: US 12,181,632 B2
- Document ID: US12181632B2
- Status: Granted
- Kind: B2
- Application number: 17/297,020
- Filed: 2019-11-15
- Published: 2022-01-27
- Granted: 2024-12-31
- Earliest claimed: 2018-12-05
- Assignees: Sony Semiconductor Solutions Corporation
- Applicants: Sony Semiconductor Solutions Corporation
- Inventors: Tomohiko Baba
- Web page: https://patentgrep.com/patent/US12181632B2

## CPC

- G02B 13/0035: {having three lenses}
- G02B 9/12: having three components only
- G02B 13/004: {having four lenses}
- G02B 13/006: {at least one element being a compound optical element, e.g. cemented elements}
- G02B 13/04: Reversed telephoto objectives
- H04N 23/50: Constructional details
- H04N 23/60: Control of cameras or camera modules
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

In a lens based on one-group configuration, performance is improved, and a wide angle and a low height are achieved. An imaging lens includes first to third lenses. These first to third lenses are sequentially arranged from an object side to an image surface side without sandwiching air. Each surface of the first to third lenses has an aspherical shape. An imaging element is arranged on the image surface side of the imaging lens. A cover glass is attached on an imaging surface of the imaging element without an air gap. Another lens may be arranged between the imaging lens and the imaging element.

## Claims

### Claim 1

An imaging device, comprising:
an imaging lens that includes a first lens, a second lens, and a third lens sequentially arranged from an object side to an image side without sandwiching air between the first lens, the second lens, and the third lens, wherein
the first lens and the third lens both have a biconcave shape,
an optical path of light at a periphery of the imaging lens is longer than an optical path of the light at a center of the imaging lens based on the biconcave shape of each of the first lens and the third lens, and
each of a bonded surface of the first lens and the second lens and a bonded surface of the second lens and the third lens has an aspherical surface;
an imaging element on the image side of the imaging lens; and
a cover glass attached on an imaging surface of the imaging element without an air gap between the imaging element and the cover glass.

### Claim 2 (depends on 1)

The imaging device according to claim 1, wherein the first lens is a negative lens, the second lens is a positive lens, and the third lens is a negative lens.

### Claim 3 (depends on 1)

The imaging device according to claim 1, wherein the imaging lens satisfies Conditional Expression (a) below,
Conditional Expression (a): −10≤R1/f≤−0.1,
wherein
f: Focal length of the imaging lens,
R1: Curvature radius of a first surface, and
the first surface is a surface of the first lens on the object side.

### Claim 4 (depends on 1)

The imaging device according to claim 1, wherein the imaging lens satisfies Conditional Expression (b) below,
Conditional Expression (b): 0.05≤R2/f≤5,
wherein
f: Focal length of the imaging lens,
R2: Curvature radius of a second surface, and
the second surface is the bonded surface of the first lens and the second lens.

### Claim 5 (depends on 1)

The imaging device according to claim 1, wherein the imaging lens satisfies Conditional Expression (c) below,
Conditional Expression (c): −5≤R3/f≤−0.05,
wherein
f: Focal length of the imaging lens,
R3: Curvature radius of a third surface, and
the third surface is the bonded surface of the second lens and the third lens.

### Claim 6 (depends on 1)

The imaging device according to claim 1, wherein
the cover glass has a maximum chief ray angle of an incident light of more than 35°, and
the cover glass is configured to relax an emission angle to the imaging surface by 5° or more by refraction of the incident light.

### Claim 7 (depends on 1)

The imaging device according to claim 1, further comprising: a fourth lens between the imaging lens and the cover glass with air sandwiched between the fourth lens and the imaging lens.

### Claim 8

An imaging device, comprising:
an imaging lens that includes a first lens, a second lens, and a third lens sequentially arranged from an object side to an image side without sandwiching air between the first lens, the second lens, and the third lens, wherein
each of a bonded surface of the first lens and the second lens and a bonded surface of the second lens and the third lens has an aspherical surface, and
the imaging lens satisfies Conditional Expression (a) below,
Conditional Expression (a): −10≤R1/f≤−0.1,
wherein
f: focal length of the imaging lens,
R1: curvature radius of a first surface, and
the first surface is a surface of the first lens on the object side;
an imaging element on the image side of the imaging lens; and
a cover glass attached on an imaging surface of the imaging element without an air gap between the imaging element and the cover glass.