# US 12,000,029 B2 · Titanium copper foil, extended copper article, electronic device component, and auto-focus camera module

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- Number: US 12,000,029 B2
- Document ID: US12000029B2
- Status: Granted
- Kind: B2
- Application number: 17/291,706
- Filed: 2019-08-20
- Published: 2022-01-06
- Granted: 2024-06-04
- Earliest claimed: 2018-11-09
- Assignees: JX Metals Corporation
- Applicants: JX Metals Corporation
- Inventors: Kenta Tsujie
- Web page: https://patentgrep.com/patent/US12000029B2

## CPC

- C22C 9/00: Alloys based on copper
- C22F 1/08: of copper or alloys based thereon
- G02B 7/04: with mechanism for focusing or varying magnification
- G02B 7/09: adapted for automatic focusing or varying magnification
- G03B 13/36: Autofocus systems
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

Provided is a titanium copper foil which has required high strength when used as a spring, and has improved etching uniformity, and which can be suitably used as a conductive spring material for use in electronic device parts such as autofocus camera modules. The titanium copper foil contains from 1.5 to 5.0% by mass of Ti and from 10 to 3000 pm by mass of Fe, the balance being Cu and inevitable impurities, wherein the titanium copper foil has crystal orientation having A of from 10 to 40, in which A is represented by the following equation (1) when measuring a rolled surface by an X-ray diffraction method: A=β{220}/(β{200}+β{311}) Equation (1) in which the β{220}, the β{200}, and the β{311} represent half-value widths of X-ray diffraction peaks at a {220} crystal plane, a {200} crystal plane, and a {311} crystal plane, respectively.

## Claims

### Claim 1

A titanium copper foil comprising from 1.5% by mass to 5.0% by mass of Ti and from 10 ppm by mass to 3000 pm by mass of Fe, the titanium copper having a tensile strength of 1100 MPa or more in each of directions parallel to a rolling plane: a direction parallel to a rolling direction, a direction perpendicular to the rolling direction, and a direction of 45° relative to the rolling direction, and the balance being Cu and inevitable impurities, wherein the titanium copper foil has crystal orientation having A of from 10 to 40, in which A is represented by the following equation (1) when measuring a rolled surface by an X-ray diffraction method:
A=β{220}/(β{200}+β{311}) Equation (1)
in which the β {220}, the β {200}, and the β {311} represent half-value widths of X-ray diffraction peaks at a {220} crystal plane, a {200} crystal plane, and a {311} crystal plane, respectively.

### Claim 2 (depends on 1)

The titanium copper foil according to claim 1, wherein the A is from 12 to 38.

### Claim 3 (depends on 1)

The titanium copper according to claim 1, wherein a difference between a maximum value and a minimum value of tensile strengths in directions parallel to a rolling plane: a direction parallel to a rolling direction, a direction perpendicular to the rolling direction, and a direction of 45° relative to the rolling direction is 400 MPa or less.

### Claim 4 (depends on 1)

The titanium copper foil according to claim 1, wherein the titanium copper foil has a thickness of 0.1 mm or less.

### Claim 5 (depends on 4)

The titanium copper according to claim 4, further comprising one or more elements selected from Ag, B, Co, Mg, Mn, Mo, Ni, P, Si, Cr, and Zr in a total amount of 1.0% by mass or less.

### Claim 6 (depends on 1)

A copper rolled product comprising the titanium copper foil according to claim 1.

### Claim 7 (depends on 1)

An electronic device part comprising the titanium copper foil according to claim 1.

### Claim 8 (depends on 7)

The electronic device part according to claim 7, wherein the electronic device part is an autofocus camera module.

### Claim 9 (depends on 1)

An autofocusing camera module comprising: a lens; a spring member for elastically biasing the lens to an initial position in an optical axis direction;
and an electromagnetic driver configured to generate electromagnetic force for withstanding a biasing force of the spring member so that the lens can be driven in the optical axis direction, wherein the spring member comprises the titanium copper foil according to claim 1.