Glass sheet composite, diaphragm using the same, and image projection structure

1. A glass sheet composite, comprising:

a first glass sheet;

a second glass sheet; and

a liquid layer sandwiched between the first glass sheet and the second glass sheet,

wherein:

the glass sheet composite has a loss coefficient greater than or equal to 1×10 −2 at 25° C., and an acoustic velocity of longitudinal wave greater than or equal to 5.0×10 3 m/s in a sheet thickness direction at 25° C.;

the liquid layer has a viscous coefficient of 1×10 −4 -1×10 3 Pa·s at 25° C., and a surface tension of 15-80 mN/m at 25° C.; and

the liquid layer comprises particles whose mean particle diameter is 0.3-1 μm.

2. The glass sheet composite as claimed in claim 1 , wherein the liquid layer comprises a medium, and a difference between a refractive index of the medium and a refractive index of the particles is greater than or equal to 0.15.

3. The glass sheet composite as claimed in claim 1 , wherein a volume ratio of the particles is 0.1-5 vol % when an entirety of the liquid layer in volume is taken as 100 vol %.

4. The glass sheet composite as claimed in claim 1 , wherein the particles include is a particle having an anisotropic shape.

5. The glass sheet composite according to claim 1 , wherein the particles are particles selected from the group consisting of hollow particles, porous particles, and a mixture thereof.

6. The glass sheet composite as claimed in claim 1 , wherein the liquid layer further comprises a light absorbing material.

7. The glass sheet composite as claimed in claim 1 , wherein a surface of at least one of the first glass sheet and the second glass sheet has a rugged structure.

8. A diaphragm, comprising:

the glass sheet composite as claimed in claim 1 ; and

a vibrating element.

9. An image projection structure, comprising:

the diaphragm as claimed in claim 8 .

10. An image projection structure, comprising:

the glass sheet composite as claimed in claim 1 .