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US-12623440-B2 - Windshield for vehicle and method for manufacturing the same

US12623440B2US 12623440 B2US12623440 B2US 12623440B2US-12623440-B2

Abstract

A windshield for a vehicle and a method for manufacturing the windshield are provided in the disclosure. The windshield includes an outer glass panel, an inner glass panel, and an intermediate adhesive layer. An opaque masking layer is disposed on at least one surface of the windshield. The opaque masking layer includes a dark ceramic-ink layer and an ultraviolet-drying ink layer. The dark ceramic-ink layer has a first no-ink region, the ultraviolet-drying ink layer is located in the first no-ink region, the ultraviolet-drying ink layer has a light transmitting region. According to the disclosure, an optical quality of the light transmitting region can be ensured, a diopter of the light transmitting region is less than or equal to 200 mdpt.

Inventors

  • Lele TU
  • Hui Wang
  • Xianping Liu
  • Jinliang GUAN
  • Feng Cai

Assignees

  • FUYAO GLASS INDUSTRY GROUP CO., LTD.

Dates

Publication Date
20260512
Application Date
20230310
Priority Date
20200921

Claims (15)

  1. 1 . A windshield for a vehicle, comprising an outer glass panel, an inner glass panel, and an intermediate adhesive layer, the outer glass panel having a first surface toward an outside of the vehicle and a second surface toward an inside of the vehicle, the inner glass panel having a third surface toward the outside of the vehicle and a fourth surface toward the inside of the vehicle, the second surface being bonded with the third surface via the intermediate adhesive layer, and at least one of the outer glass panel or the inner glass panel being a bent glass panel that is formed by subjecting a flat glass panel to high-temperature heat treatment of at least 560° C. and bending process, wherein the windshield further comprises an opaque masking layer, wherein the opaque masking layer comprises a dark ceramic-ink layer and an ultraviolet-drying ink layer, wherein the dark ceramic-ink layer is disposed on at least one of the second surface or the fourth surface, the ultraviolet-drying ink layer is disposed on at least one of the second surface, the third surface, or the fourth surface, the dark ceramic-ink layer has a first no-ink region, and wherein the ultraviolet-drying ink layer is located in the first no-ink region, and the ultraviolet-drying ink layer has a light transmitting region, wherein the light transmitting region has a diopter less than or equal to 200 milli-diopter (mdpt), wherein Lab values of the dark ceramic-ink layer satisfy 4.5<L1<7.2, −2.3<a1<0.85, −1.5<b1<1.8, a total color difference ΔE between the ultraviolet-drying ink layer and the dark ceramic-ink layer satisfies ΔE<1, and the total color difference ΔE is calculated according to the following formula: Δ E =√{square root over (( L 2− L 1) 2 +( a 2− a 1) 2 +( b 2− b 1) 2 )}, wherein L2, a2, and b2 are Lab values of the ultraviolet-drying ink layer.
  2. 2 . The windshield of claim 1 , comprising at least one image acquisition device that is disposed at a side of the windshield inside the vehicle, wherein the image acquisition device is configured to perform image acquisition through the light transmitting region.
  3. 3 . The windshield of claim 2 , wherein the light transmitting region is larger than a region of the windshield in a field of view of the image acquisition device in outline by 1 mm to 5 mm.
  4. 4 . The windshield of claim 1 , wherein the dark ceramic-ink layer is formed by being disposed on the flat glass panel and subjected to high-temperature heat treatment of at least 560° C. and bending process, and the ultraviolet-drying ink layer is formed on the bent glass panel that is formed through high-temperature heat treatment of at least 560° C. and bending process or on another flat glass panel without being subjected to high-temperature heat treatment of at least 560° C. and bending process.
  5. 5 . The windshield of claim 1 , wherein the first no-ink region has a first boundary, the ultraviolet-drying ink layer has a second boundary, the light transmitting region has a third boundary, the second boundary is larger than or equal to the first boundary, and a distance between the second boundary and the third boundary is greater than or equal to 5 mm.
  6. 6 . The windshield of claim 5 , wherein the distance between the second boundary and the third boundary ranges from 10 mm to 80 mm.
  7. 7 . The windshield of claim 1 , comprising a dark ceramic-ink region at a periphery of the windshield, wherein the dark ceramic-ink region is coated with black ceramic-ink or brown ceramic-ink.
  8. 8 . The windshield of claim 1 , wherein the dark ceramic-ink layer is made from an organic solvent and an inorganic powder, a mass percent of the inorganic powder in the dark ceramic-ink layer ranges from 70% to 85%, and the inorganic powder comprises a glass glaze, a pigment, and an additive, wherein the glass glaze has an average particle-size ranging from 5 μm to 10 μm.
  9. 9 . The windshield of claim 1 , wherein the ultraviolet-drying ink layer is formed through ultraviolet curing at a temperature lower than or equal to 200° C.
  10. 10 . The windshield of claim 1 , wherein the ultraviolet-drying ink layer is made from an ultraviolet-curable resin, a diluted acrylate monomer, a pigment, a photoinitiator, and an additive.
  11. 11 . The windshield of claim 1 , wherein a thickness of the dark ceramic-ink layer is larger than 15 μm and a thickness of the ultraviolet-drying ink layer is larger than 15 μm, and a difference between the thickness of the dark ceramic-ink layer and the thickness of the ultraviolet-drying ink layer is less than or equal to 1 μm.
  12. 12 . The windshield of claim 1 , further comprising a transparent conductive film on at least one of the second surface, the third surface, or the fourth surface, wherein the transparent conductive film defines a film-free window that corresponds to the light transmitting region, and the film-free window is formed by at least partially removing the transparent conductive film.
  13. 13 . The windshield of claim 1 , wherein a blackness value of the dark ceramic-ink layer is about 1, a blackness value of the ultraviolet-drying ink layer is about 1, a thickness of the dark ceramic-ink layer ranges from 18 μm to 25 μm, and a thickness of the ultraviolet-drying ink layer ranges from 18 μm to 25 μm.
  14. 14 . The windshield of claim 1 , wherein a visible light transmittance of the light transmitting region is greater than or equal to 70%, and a haze of the light transmitting region is less than or equal to 5%.
  15. 15 . The windshield of claim 1 , wherein a visible light transmittance of the dark ceramic-ink layer is less than or equal to 1.5%, a visible light transmittance of the ultraviolet-drying ink layer is less than or equal to 1.5%, an ultraviolet transmittance of the dark ceramic-ink layer is less than or equal to 0.05%, and an ultraviolet transmittance of the ultraviolet-drying ink layer is less than or equal to 0.05%.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a continuation-in-part of International Application No. PCT/CN2021/127745, filed Oct. 30, 2021, which claims priority to Chinese Patent Application No. 202010992758.3, filed Sep. 21, 2020, the entire disclosures of which are hereby incorporated by reference. TECHNICAL FIELD This disclosure relates to the technology field of glass products, and particularly to vehicle glass configured to be mounted at an opening of a vehicle body. Specifically, this disclosure provides a windshield for a vehicle and a method for manufacturing the windshield. BACKGROUND With popularity of intelligent vehicle technologies such as assisted driving and autonomous driving, the number of cameras demanded has grown from only one to two, three or even more, and the requirement for image quality of cameras has also been enormously enhanced. For a front camera module (FCM) mounted on a windshield for a vehicle, a camera needs to obtain, through the windshield, a real-time view of the vehicle in a driving direction. Thus, for a light transmitting region of the windshield that allows the camera to observe an outside of the vehicle, requirements for visible light transmittance, diopter, radius of curvature, and the like become higher. Generally, most windshields for vehicles are printed with black ceramic-ink in appearance to form black edges at peripheries of the windshields. There are two main functions. First, a black edge formed by printing ceramic ink can cover a rubber seal strip disposed at an edge of a windshield to block direct sunlight on the rubber seal strip, so as to protect the rubber seal strip from aging caused by prolonged radiation of ultraviolet in sunlight, thereby avoiding damage to the rubber seal strip. Second, the black edge can cover the rubber seal strip and various accessories on an inner surface of the windshield, ensuring an overall appearance aesthetics. According to existing cameras, the diopter (the maximum optical distortion value allowed) of the light transmitting region of the windshield is required to be less than 400 milli-diopter (mdpt) for most vehicles, and not greater than 200 mdpt for some high-end vehicles. However, with continuous upgrade of vehicles in intelligence, automation, security, and the like, requirements for the quality, clarity, and accuracy of an image acquired by the camera are getting higher and higher, and the vehicle even is integrated with a sensor such as a laser radar, and thus, a diopter of a region corresponding to the camera is required to be not greater than 150 mdpt, even not greater than 100 mdpt. For a windshield mounted with a camera, the ceramic ink is printed to extend to a region where a camera support is mounted and to surround the light transmitting region, while no ceramic ink is printed in the light transmitting region. However, the windshield is manufactured through high-temperature heat treatment and bending process, such as heating to reach a temperature of greater than 600° C. A glass substrate is mainly heated by heat radiation of a heating element in a heating furnace. An absorption capacity of the ceramic ink to thermal radiation is remarkably different from an absorption capacity of the glass substrate to thermal radiation, especially the glass substrate is usually disposed with a transparent nano-film which is able to reflect thermal radiation, such as a transparent conductive film and an infrared reflecting film, and thus a temperature of a region printed with the ceramic ink is higher than a temperature of a region without ceramic ink, thereby causing a temperature gradient of tens of degrees Celsius between different parts of the glass substrate. As a result, the glass substrate has a dynamic difference in bending process, and therefore optical distortion or light distortion occurs around a border between the region printed with the ceramic ink and the region without the ceramic ink, and is relatively obvious within 30 mm from the border. In order to avoid image glow, image blurring, and other abnormalities caused by excessive natural light and stray light (e.g. stray light reflected from an instrument panel) entering an optical path system of the camera, a distance between a boundary of the ceramic ink and the light transmitting region is controlled to be relatively small, the diopter of the light transmitting region surrounded by the ceramic ink may be greater than 400 mdpt, causing the image obtained by the camera through the light transmitting region to fail to meet the requirements in quality, definition, and accuracy. In order to solve a problem that the glass substrate has optical distortion or light distortion around the border between the region printed with the ceramic ink and the region without the ceramic ink, Chinese Patent Application No. 201280018141.5, Chinese Patent Application No. 201380040121.2, and United States Patent No. 20110052886A1 disclose a polyvinyl butyral (P