# US 2019/0170909 A1 · Method of forming film of lens and fresnel lens

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- Number: US 2019/0170909 A1
- Document ID: US20190170909A1
- Status: Published application
- Kind: A1
- Application number: 16/190,606
- Filed: 2018-11-14
- Published: 2019-06-06
- Earliest claimed: 2017-12-06
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: TAKAYUKI ABE
- Web page: https://patentgrep.com/patent/US20190170909A1

## CPC

- G02B 1/12: by surface treatment, e.g. by irradiation
- C03C 17/007: {containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase}
- G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)}
- G02B 5/003: {Light absorbing elements}
- C03C 2218/328: Partly or completely removing a coating
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A Fresnel lens includes a Fresnel lens body, grooves formed on the lens surface of the Fresnel lens body and having bottom surfaces and inclined surfaces and a light absorber formed over the inclined surfaces and the bottom surfaces in which a contact angle at an end portion of the light absorber with respect to the bottom surface is larger than 70 degrees is used. A method of forming a film of a lens includes coating inclined portions of a plurality of grooves formed on a lens surface with ink, fixing the ink and removing unnecessary portions of the ink by laser.

## Claims

### Claim 1

A Fresnel lens comprising:
a Fresnel lens body;
grooves formed on a lens surface of the Fresnel lens body and having bottom surfaces and inclined surfaces; and
a light absorber formed over the inclined surfaces and the bottom surfaces,
wherein a contact angle at an end portion of the light absorber with respect to the bottom surface is larger than 70 degrees.

### Claim 2

A Fresnel lens comprising:
a Fresnel lens body;
grooves formed on a lens surface of the Fresnel lens body and having bottom surfaces and inclined surfaces; and
a light absorber formed over the inclined surfaces and the bottom surfaces,
wherein a layer having a thinner thickness than thicknesses of other parts is provided at an end portion of the light absorber.

### Claim 3 (depends on 2)

The Fresnel lens according to claim 2,
wherein the thickness of the thin layer is 5 μm or less.

### Claim 4

A Fresnel lens comprising:
a Fresnel lens body;
grooves formed on a lens surface of the Fresnel lens body and having bottom surfaces and inclined surfaces; and
a light absorber formed over the inclined surfaces and the bottom surfaces,
wherein an end portion of the light absorber is a line having one or more flection points or a curve formed of an aggregation of points.

### Claim 5

A method of forming a film of a lens comprising:
coating inclined portions of a plurality of grooves formed on a lens surface with ink;
fixing the ink; and
removing unnecessary portions of the ink by laser.

### Claim 6 (depends on 5)

The method of forming the film of the lens according to claim 5,
wherein part of the unnecessary portions is allowed to remain in the step of removing the ink by the laser.

### Claim 7 (depends on 5)

The method of forming the film of the lens according to claim 5,
wherein a contact angle at an end portion of the ink is larger than 70 degrees in the step of removing the ink by the laser.

### Claim 8 (depends on 5)

The method of forming the film of the lens according to claim 5,
wherein the laser is a green laser.

### Claim 9 (depends on 5)

The method of forming the film of the lens according to claim 5,
wherein the ink is an ultraviolet curable ink containing a pigment component with a particle diameter of 10 nm to 1 μm.

### Claim 10 (depends on 9)

The method of forming the film of the lens according to claim 9,
wherein the pigment component contains carbon particles.

### Claim 11 (depends on 5)

The method of forming the film of the lens according to claim 5,
wherein the ink is a volatile-dye solvent ink.