# US 2024/0201366 A1 · Millimeter-wave-transmitting garnish

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- Number: US 2024/0201366 A1
- Document ID: US20240201366A1
- Status: Published application
- Kind: A1
- Application number: 18/556,806
- Filed: 2022-05-18
- Published: 2024-06-20
- Earliest claimed: 2021-05-31
- Assignees: Toyoda Gosei Co., Ltd.
- Applicants: Toyoda Gosei Co., Ltd.
- Inventors: Kozo HIROTANI; Kazuyoshi FUJIMOTO; Yosuke MARUOKA; Yutaka OTSUKA
- Web page: https://patentgrep.com/patent/US20240201366A1

## CPC

- G01S 13/931: of land vehicles
- H01Q 1/422: {comprising two or more layers of dielectric material (H01Q1/425 takes precedence)}
- H01Q 1/3233: {particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems}
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

A millimeter wave transmissive decoration is arranged forward of a millimeter wave radar device in an emission direction of millimeter waves. The millimeter wave transmissive decoration includes a layer structure including layers stacked in the emission direction. The layers include a decorative layer and a plastic layer. At least part of the decorative layer is made of a white plastic layer. The plastic layer is in contact with the white plastic layer. The white plastic layer is made of a polycarbonate plastic containing particles of titanium oxide having a rutile crystal structure. A thickness in the emission direction of the white plastic layer is less than or equal to 2.0 mm. A permittivity of the white plastic layer is less than or equal to 3.1. An L value in a Lab color space of the white plastic layer is greater than or equal to 80.

## Claims

### Claim 1

A millimeter wave transmissive decoration employed in a vehicle equipped with a millimeter wave radar device that emits and receives millimeter waves, the millimeter wave transmissive decoration being configured to be arranged forward of the millimeter wave radar device in an emission direction of the millimeter waves, the millimeter wave transmissive decoration comprising a layer structure that includes layers stacked in the emission direction, wherein
the layers include a decorative layer configured to decorate the vehicle and a plastic layer,
at least part of the decorative layer is made of a white plastic layer,
the plastic layer is in contact with the white plastic layer,
the white plastic layer is made of a polycarbonate plastic containing particles of titanium oxide having a rutile crystal structure,
a thickness in the emission direction of the white plastic layer is less than or equal to 2.0 mm,
a permittivity of the white plastic layer is less than or equal to 3.1, and
an L value in a Lab color space of the white plastic layer is greater than or equal to 80.

### Claim 2 (depends on 1)

The millimeter wave transmissive decoration according to claim 1, wherein the titanium oxide is added to the white plastic layer at an additive rate in a range of 1.8% to 8.2%.

### Claim 3 (depends on 1)

The millimeter wave transmissive decoration according to claim 1, wherein
the plastic layer includes a transparent plastic layer made of a polycarbonate plastic, and
the transparent plastic layer is in contact with a front surface of the white plastic layer in the emission direction.

### Claim 4 (depends on 1)

The millimeter wave transmissive decoration according to claim 1, wherein
the plastic layer includes a base made of acrylonitrile-ethylene-styrene copolymer plastic, and
the base is in contact with a rear surface of the white plastic layer in the emission direction.