Patent ID: 7554629

Claim:
A method of manufacturing a microlens substrate, the microlens substrate being provided with a plurality of microlenses, the method comprising the steps of: preparing a first substrate with concave portions, the first substrate having two major surfaces and a plurality of concave portions formed in one of the two major surfaces, each of the plurality of concave portions having a shape corresponding to that of each of the plurality of microlenses; preparing a base material substrate formed of a glass material having a glass transformation point lower than that of a constituent material constituting the first substrate, the base material substrate having two major surfaces including one major surface that faces the one major surface of the first substrate; and pressure-joining the first substrate to the base material substrate in a state that the first substrate and the base material substrate are heated while cooling the other major surface of the base material substrate, wherein in the pressure-joining step, the first substrate is joined to the base material substrate and the plurality of concave portions is filled with the glass material of the base material substrate which has been melted by the heat.