Lens member, method of manufacturing the same, communication module, lens array, and light-source module
There are provided a lens member, a method of manufacturing the lens member, a communication module, a lens array, and a light-source module, the lens member including a ready-made glass lens added with a mounting portion having a reference face as a plane for reference when the glass lens is mounted on a substrate. A lens member includes a glass ball lens to which sphericity processing has been previously performed, and a resin mounting portion 13 disposed on the glass ball lens. The mounting portion is molded by flowing the resin in a flowable state into a die including the glass ball lens disposed therein. The mounting portion includes a reference face that abuts on a mounting face in a case where the glass ball lens is surface-mounted, provided thereto.
1. A lens member to be surface-mounted to a substrate, the lens member comprising:
a glass lens that has been previously made; and
a mounting portion including a material different from the glass lens, provided by flowing the material in a flowable state into a mold in which the glass lens is disposed and fixing the material, the mounting portion housing therein at least a portion of the glass lens,
wherein the mounting portion has a polygonal column shape including a top face, a bottom face, and plural side faces,
wherein an incident face of the glass lens, where light to the glass lens is incident, and an emission face of the glass lens, where light from the glass lens is emitted, are exposed by way of openings provided on the top face and on the bottom face of the mounting portion, and
wherein one of the plural side faces of the mounting portion is a reference face that abuts on a mounting face in a case where the glass lens is surface-mounted to the substrate.
2. The lens member according to claim 1 , wherein the glass lens is circular when viewed in an optical axis direction.
3. The lens member according to claim 1 , wherein the glass lens is a glass ball lens including a glass ball to which sphericity processing has been performed.
4. The lens member according to claim 1 , wherein at least one of the plural side faces includes a hole passing to a surface of the glass lens, the hole being formed at a portion of the at least one of the plural side faces at which a thickness of the mounting portion becomes thin as a plane of an outer surface of the at least one of the plural side faces and the surface of the glass lens come close to each other.
5. The lens member according to claim 3 , wherein at least one of the plural side faces includes a hole passing to a surface of the glass lens, the hole being formed at a portion at which a thickness of the mounting portion becomes thin as a plane of an outer surface of the at least one of the plural side faces and the surface of the glass lens come close to each other.
6. The lens member according to claim 1 , wherein a hole passing from the reference face of the mounting portion to a surface of the glass lens is formed at a portion at which a thickness of the mounting portion becomes thin as the reference face and the surface of the glass lens come close to each other.
7. The lens member according to claim 3 , wherein a hole passing from the reference face of the mounting portion to a surface of the glass lens is formed at a portion at which a thickness of the mounting portion becomes thin as the reference face and the surface of the glass lens come close to each other.
8. The lens member according to claim 1 , wherein a shortest distance between a side face of the glass lens disposed in the mounting portion and a side face of the mounting portion is 0.1 mm or more.
9. The lens member according to claim 1 , wherein the mounting portion is formed so as to have a rectangular parallelepiped shape and includes a pair of side faces, parallel to each other, disposed so as to be perpendicular to an optical axis of the glass lens, a thickness of the glass lens in an optical axis direction being defined as D, and a distance of the mounting portion between the pair of side faces perpendicular to the optical axis of the glass lens, in the optical axis direction being defined as T, a value of T is a value of D or more.
10. The lens member according to claim 1 , wherein the mounting portion is formed so as to have a rectangular parallelepiped shape and includes a pair of side faces, parallel to each other, disposed so as to be perpendicular to an optical axis of the glass lens, a thickness of the glass lens in an optical axis direction being defined as D, and a distance of the mounting portion between the pair of side faces perpendicular to the optical axis of the glass lens, in the optical axis direction being defined as T, the following expression is satisfied:
0.2D≦T≦2.0D.
11. A method of manufacturing a lens member to be used for manufacturing the lens member according to claim 1 , comprising
providing a mounting portion including a reference face that abuts on a mounting face when the glass lens is surface-mounted, by flowing a material, different from the glass lens and having fluidity, into a mold in which the glass lens previously made is disposed and fixing the material.
12. A communication module comprising: the lens member according to claim 1 ; a light-emitting element; and a substrate including the lens member and the light-emitting element surface-mounted thereon, wherein light of the light-emitting element is incident on an optical communication cable through the lens member.