# US 10,502,954 B2 · Laminated glass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,954 B2 - Document ID: US10502954B2 - Status: Granted - Kind: B2 - Application number: 15/994,225 - Filed: 2018-05-31 - Published: 2018-12-06 - Granted: 2019-12-10 - Earliest claimed: 2017-06-02 - Assignees: AGC Inc. - Applicants: AGC Inc. - Inventors: Shunsuke Sadakane; Shunpei Oosumi - Web page: https://patentgrep.com/patent/US10502954B2 ## CPC - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - B32B 17/10036: {comprising two outer glass sheets} - B32B 17/10082: {Properties of the bulk of a glass sheet} - B32B 17/1011: {having predetermined tint or excitation purity} - B32B 17/10568: {varying in thickness} - B32B 17/10761: {containing vinyl acetal} - G02B 27/0018: {with means for preventing ghost images (anti-reflection coatings G02B1/11)} - B32B 2250/03: 3 layers - B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA - G02B 2027/012: {comprising devices for attenuating parasitic image effects} - G03B 21/62: Translucent screens - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - 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 A laminated glass includes first and second glass plates to be arranged on the inside and the outside of a vehicle, respectively; an interlayer located between the first and second glass plates and bonded to the first and second glass plates; and a display area used for a head up display, including a region having a wedge shape in a cross section, a thickness at an upper end of the region in a vertical direction being greater than a thickness at a lower end of the region. A difference, Δt [mm], between a thickness of the laminated glass at a thickest portion in the display area and a thickness at a thinnest portion, and a difference, ΔTv [%], between a visible light transmittance of the laminated glass at the thickest portion in the display area and a visible light transmittance at the thinnest portion, satisfy a relation of ΔTv≥2.2Δt. ## Claims ### Claim 1 A laminated glass comprising: a first glass plate to be arranged on an inner side of a vehicle; a second glass plate to be arranged on an outer side of the vehicle; an interlayer located between the first glass plate and the second glass plate and bonded to the first glass plate and the second glass plate; and a display area configured to be used for a head up display, wherein the display area includes a region having a wedge shape in a cross section, a thickness at an upper end of the region in a vertical direction being greater than a thickness at a lower end of the region, when the laminated glass is installed on the vehicle, wherein a difference in thickness, Δt [mm], between a thickness of the laminated glass at a thickest portion in the display area and a thickness of the laminated glass at a thinnest portion in the display area, and a difference in visible light transmittance, ΔTv [%], between a visible light transmittance of the laminated glass at the thickest portion in the display area and a visible light transmittance of the laminated glass at the thinnest portion in the display area, satisfy a relation of ΔTv≥2.2 Δt, and wherein a member with a lowest visible light transmittance per unit thickness from among the first glass plate, the second glass plate and the interlayer has a wedge shape in a cross section. ### Claim 2 (depends on 1) The laminated glass according to claim 1, wherein the difference in thickness, Δt [mm], and the difference in visible light transmittance, ΔTv [%], satisfy a relation of ΔTv≥2.4 Δt. ### Claim 3 (depends on 2) The laminated glass according to claim 2, wherein the difference in thickness, Δt [mm], and the difference in visible light transmittance, ΔTv [%], satisfy a relation of ΔTv≥2.6 Δt. ### Claim 4 (depends on 1) The laminated glass according to claim 1, wherein either or both of the first glass plate and the second glass plate has a wedge shape in a cross section. ### Claim 5 (depends on 1) The laminated glass according to claim 1, wherein the interlayer has a wedge shape in a cross section, and wherein a thickness of the interlayer at a thinnest portion in the display area is 0.65 mm or more. ### Claim 6 (depends on 1) The laminated glass according to claim 1, wherein the interlayer includes a polyvinyl butyral resin, and the first glass plate and the second glass plate are formed of a green glass. ### Claim 7 (depends on 1) The laminated glass according to claim 1, wherein an average value of a wedge angle in the region having a wedge shape in a cross section is 1.5 mrad or less. ### Claim 8 (depends on 1) The laminated glass according to claim 1, wherein an average value of a wedge angle in the region having a wedge shape in a cross section is 0.4 mrad or less. ### Claim 9 (depends on 1) The laminated glass according to claim 1, wherein a radius of curvature of the laminated glass in the vertical direction is 6000 mm or more. ### Claim 10 A laminated glass comprising: a first glass plate to be arranged on an inner side of a vehicle; a second glass plate to be arranged on an outer side of the vehicle; an interlayer located between the first glass plate and the second glass plate and bonded to the first glass plate and the second glass plate; and a display area configured to be used for a head up display, wherein the display area includes a region having a wedge shape in a cross section, a thickness at an upper end of the region in a vertical direction being greater than a thickness at a lower end of the region, when the laminated glass is installed on the vehicle, wherein a difference in thickness, Δt [mm], between a thickness of the laminated glass at a thickest portion in the display area and a thickness of the laminated glass at a thinnest portion in the display area, and a difference in visible light transmittance, ΔTv [%], between a visible light transmittance of the laminated glass at the thickest portion in the display area and a visible light transmittance of the laminated glass at the thinnest portion in the display area, satisfy a relation of ΔTv≥2.2 Δt, and wherein a wedge angle in an area from an upper end of the display area to an upper end of the laminated glass is less than a wedge angle in the region having a wedge shape in a cross section. ### Claim 11 (depends on 10) The laminated glass according to claim 10, wherein the difference in thickness, Δt [mm], and the difference in visible light transmittance, ΔTv [%], satisfy a relation of ΔTv≥2.4 Δt. ### Claim 12 (depends on 11) The laminated glass according to claim 11, wherein the difference in thickness, Δt [mm], and the difference in visible light transmittance, ΔTv [%], satisfy a relation of ΔTv≥2.6 Δt. ### Claim 13 (depends on 10) The laminated glass according to claim 10, wherein a member with a lowest visible light transmittance per unit thickness from among the first glass plate, the second glass plate and the interlayer has a wedge shape in a cross section. ### Claim 14 (depends on 13) The laminated glass according to claim 13, wherein either or both of the first glass plate and the second glass plate has a wedge shape in a cross section. ### Claim 15 (depends on 13) The laminated glass according to claim 13, wherein a member with a lowest visible light transmittance per unit thickness from among the first glass plate, the second glass plate and the interlayer has a wedge shape in a cross section, wherein the interlayer has a wedge shape in a cross section, and wherein a thickness of the interlayer at a thinnest portion in the display area is 0.65 mm or more. ### Claim 16 (depends on 10) The laminated glass according to claim 10, wherein the interlayer includes a polyvinyl butyral resin, and the first glass plate and the second glass plate are formed of a green glass. ### Claim 17 (depends on 10) The laminated glass according to claim 10, wherein an average value of a wedge angle in the region having a wedge shape in a cross section is 1.5 mrad or less. ### Claim 18 (depends on 10) The laminated glass according to claim 10, wherein an average value of a wedge angle in the region having a wedge shape in a cross section is 0.4 mrad or less. ### Claim 19 (depends on 10) The laminated glass according to claim 10, wherein a radius of curvature of the laminated glass in the vertical direction is 6000 mm or more.