Device with glazing and associated thermal camera, and optimization methods

Patent metadata

Field	Value
Publication number	US-11962933-B2
Application number	US-202017790662-A
Country	US
Kind code	B2
Filing date	Dec 23, 2020
Priority date	Jan 3, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A device includes a vehicle glazing, including, in a peripheral zone, a through-hole including an insert and a thermal camera.

First claim

The invention claimed is:

1. A device, comprising:
a vehicle glazing of given thickness E1, the vehicle glazing having an outer main face oriented outward and an inner main face on a vehicle interior side, the vehicle glazing comprising, in a peripheral zone, a through-hole between the inner main face and the outer main face, the through-hole being delimited by a side wall of the vehicle glazing,
in said through-hole, an insert made of a material that is transparent in a range A of wavelengths in an infrared spectrum beyond 2.5 μm, ranging at least from 9.5 to 10.5 μm, the insert being of given thickness e, made of a material of refractive index n in the range A, with an input face oriented toward the vehicle interior and an output face, the input face fitting within a rectangle or square of width Wi and height Di with aspect ratio Di/Wi of at least 0.8 and of at most 1.2, with Di at most 35 mm, defining a center O which is an intersection of the diagonals of said rectangle,
a thermal camera, disposed on the inner main face side so as to receive an electromagnetic radiation after passing through said insert, the thermal camera comprising an input pupil, with a height p, and an infrared detection system in a range A and a lens, the camera being defined by:
an optical axis X′ passing through a center C of the pupil, C facing the insert,
a vertical viewing angle θ of at least 10°,

the thermal camera being of given volume defined by a point of contact T capable of touching the vehicle glazing first, or a plate on the inner main face of the vehicle glazing, or the insert, or a piece in a peripheral environment of said vehicle glazing, in position mounted in a vehicle,
an orthogonal reference frame (O, X, Y, Z) is defined in which X is an axis parallel to the optical axis X′, oriented toward the outer main face, Z is an axis normal to the optical axis, the axis Y is normal to X in a plane containing P0 oriented toward a top of the vehicle glazing, Z is normal to P0
T being in a plane P0 passing through O and C or Tv, which is a virtual point of contact, is defined as being a projection of T in said plane P0, w being the distance according to X and algebraic in the plane P0 from T or Tv and h is a distance according to Y in the plane P0 between C and T or Tv, the input main face of the insert having an inclination defined by an angle α with respect to X,
wherein a first straight line Dt1 is defined

y
=

-

tan
⁡
(

θ
2

)

⁢
x

+

(

cos
⁢

α
⁢

tan
⁡
(

θ
2

)

-

sin
⁢

α

)

[

D
i

⁢

1
-

1

n
2

⁢

cos
2

(

α
-

θ
2

)

-

2
⁢

e
n

⁢

cos
⁡
(

α
-

θ
2

)

]

2
⁢

1
-

1

n
2

⁢

cos
2

(

α
-

θ
2

)

Assignees

• Saint Gobain

Inventors

• Berard Mathieu
• Yavari Keihann

Classifications

• H04N5/33 Primary

  Transforming infrared radiation (cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20) · CPC title

• B60J1/02

  arranged at the vehicle front {, e.g. structure of the glazing, mounting of the glazing (on windscreen mounted antenna wire H01Q1/1271)} · CPC title

• B60R11/04

  Mounting of cameras operative during drive; Arrangement of controls thereof relative to the vehicle · CPC title

• B60R2011/0026

  Windows, e.g. windscreen · CPC title

• B32B17/1055 Primary

  characterized by the resin layer, i.e. interlayer · CPC title