Substrate for mounting IC chip
An object of the present invention is to provide a substrate for mounting an IC chip which is a component for optical communication having an IC chip and an optical component integrally provided thereon, which can ensure a short distance between the IC chip and the optical component, which is excellent in electric signal transmission reliability and which can transmit optical signal through an optical path for transmitting optical signal. The substrate for mounting an IC chip of the present invention is a substrate for mounting an IC chip comprising: a substrate and, as serially built up on both faces thereof, a conductor circuit and an interlaminar insulating layer in an alternate fashion and in repetition; a solder resist layer formed as an outermost layer; and an optical element mounted thereto, wherein an optical path for transmitting optical signal, which penetrates the substrate for mounting an IC chip, is disposed.
1. A substrate for mounting an IC chip comprising:
an insulating substrate having a first surface and a second surface on an opposite side of the first surface;
a first built-up structure formed on the first surface of the insulating substrate and comprising a conductor circuit and an interlaminar insulating layer;
a second built-up structure formed on the second surface of the insulating substrate and comprising a conductor circuit and an interlaminar insulating layer;
a solder resist layer formed as an outermost layer over the first built-up structure;
an optical element mounted over the solder resist layer;
a resin layer formed between the solder resist layer and the optical element; and
an optical path for transmitting optical signal to or from the optical element and penetrating though the insulating substrate, first built-up structure, second built-up structure and solder resist layer.
2. The substrate for mounting an IC chip according to claim 1 , wherein the optical element is mounted on the solder resist layer.
3. The substrate for mounting an IC chip according to claim 2 , wherein said optical element is at least one of a light receiving element and a light emitting element.
4. The substrate for mounting an IC chip according to claim 1 , further comprising an electronic component mounted on a surface of one of the solder resist layer.
5. The substrate for mounting an IC chip according to claim 1 , further comprising a micro lens disposed on an end portion of the optical path for transmitting optical signal.
6. The substrate for mounting an IC chip according to claim 1 , wherein the optical path for transmitting optical signal has a cross-sectional diameter which is 100 to 500 μm.
7. The substrate for mounting an IC chip according to claim 1 , further comprising a plated-through hole connecting the conductor circuit of the first built-up structure and the conductor circuit of the second built-up structure through the insulating substrate and a via-hole connecting the conductor circuit in the first built-up structure and another conductor circuit in the first-built-up structure through the interlaminar insulating layer in the first built-up structure.