Light guide, light transmission module, electronic device, and manufacturing method of light guide

A light guide comprising:

• a core made of material having translucency;
• and
• an optical path conversion mirror portion formed with an optical path conversion mirror surface, on at least the core at an end, for reflecting a signal light from an optical element and converting the optical path of the signal light,
• wherein the signal light is transmitted through the core by the reflection at the optical path conversion mirror surface,
• wherein the optical path conversion mirror surface has an angle formed with a bottom surface of the core changing in an X-direction in a cross-sectional shape in which the optical path conversion mirror portion is cut at a YZ plane, the Y-direction being an optical axis direction of the optical element, the Z-direction being an advancing direction of the signal light of the light guide, and the X-direction being a direction perpendicular to both the Y-direction and the Z-direction;
• and
• wherein the optical path conversion mirror surface is formed such that the angle formed with the bottom surface of the core increases from one end towards the other end in the X-direction in the cross-sectional shape in which the optical path conversion mirror portion is cut at the YZ plane.

A light guide comprising:

• a core made of material having translucency;
• and
• an optical path conversion mirror portion formed with an optical path conversion mirror surface, on at least the core at an end, for reflecting a signal light from an optical element and converting the optical path of the signal light,
• wherein the signal light is transmitted through the core by the reflection at the optical path conversion mirror surface,
• wherein the optical path conversion mirror surface has an angle formed with a bottom surface of the core changing in an X-direction in a cross-sectional shape in which the optical path conversion mirror portion is cut at a YZ plane, the Y-direction being an optical axis direction of the optical element, the Z-direction being an advancing direction of the signal light of the light guide, and the X-direction being a direction perpendicular to both the Y-direction and the Z-direction;
• and
• wherein the optical path conversion mirror surface is formed to a curve, the shape of the curve changing from one end towards the other end in the X-direction in the cross-sectional shape in which the optical path conversion mirror portion is cut at the YZ plane.

A light guide comprising:

• a core made of material having translucency;
• and
• an optical path conversion mirror portion formed with an optical path conversion mirror surface, on at least the core at an end, for reflecting a signal light from an optical element and converting the optical path of the signal light,
• wherein the signal light is transmitted through the core by the reflection at the optical path conversion mirror surface,
• wherein the optical path conversion mirror surface has an angle formed with a bottom surface of the core changing in an X-direction in a cross-sectional shape in which the optical path conversion mirror portion is cut at a YZ plane, the Y-direction being an optical axis direction of the optical element, the Z-direction being an advancing direction of the signal light of the light guide, and the X-direction being a direction perpendicular to both the Y-direction and the Z-direction;
• and
• wherein if a center in the X-direction of the core is an origin, an area where the angle is a maximum exists on one side in the X-direction and an area where the angle is a minimum exists on the other side in the X-direction in the optical path conversion mirror portion with the origin as a reference.