Laminated glass

A laminated glass comprising:

• a first glass plate;
• a second glass plate;
• and an interlayer which is positioned between the first glass plate and the second glass plate and adheres to the first glass plate and the second glass plate,
• wherein a target projection area for use in a head-up display and on which P-polarized light can be incident from a direction of the first glass plate is defined in a part of the laminated glass, and a P-polarized light reflecting layer is provided in the target projection area,
• wherein a residual stress Δσ [MPa] in the target projection area satisfies an inequality by simultaneously satisfying following formulae (1), (2), and (3) with variables Rp, Ts, and t,
• (
• (
• 1
• -
• Rp
• )
• ×
• X
• ×
• Ts
• 2
• ×
• Rs
• )
• /
• Rp
• ≤
• 0.1
• (
• 1
• )
• X
• =
• sin
• ⁢
• δ
• (
• 2
• )
• Δ
• ⁢
• σ
• =
• δ
• /
• 2
• ⁢
• π
• ×
• (
• λ
• /
• C
• )
• /
• t
• (
• 3
• )
• wherein in a case where the P-polarized light is incident on the target projection area of the laminated glass from the direction of the first glass plate at an incident angle of 57 deg, a P-polarized light reflectance of the laminated glass is referred to as Rp, a P-polarized light transmittance is referred to as (1−Rp), a polarization conversion factor of the first glass plate and the second glass plate is referred to as X, an S-polarized light transmittance of the laminated glass is referred to as Ts, an S-polarized light reflectance of an outer main surface of the second glass plate is referred to as Rs, and a phase difference occurring inside the first glass plate and the second glass plate is referred to as δ;
• π is a circular constant, a wavelength λ of the P-polarized light is 555 [nm], a photoelastic coefficient C is configured as 2.8 [(nm/mm)/MPa], and a total thickness of the first glass plate and the second glass plate is referred to as t [mm].