Range finder structure allowing easier filling of the transparent filler

A range finder comprising:

• an optical lens mount including a pair of range finding lenses arranged side by side;
• an aperture mount including a pair of light guide spaces, the light guide spaces being arranged side by side corresponding to the range finding lenses, a pair of aperture holes for limiting the rays through the range finding lenses, the aperture holes being arranged side by side corresponding to the range finding lenses, and a partition wall separating the light guide spaces;
• and
• a sensor stage mounting including a semiconductor sensor chip thereon, the semiconductor sensor chip measuring the distance between an object and the image of the object formed thereon through the range finding lenses;
• wherein the optical lens mount, the aperture mount and the sensor stage being piled up and combined into a unit, whereby to form a module of the range finder;
• wherein a transparent filler fills a space inside the module of the range finder to seal the semiconductor sensor chip;
• and
• wherein the aperture mount comprises a channel of flow formed across the partition wall, the channel of flow connecting the light guide spaces arranged side by side wherein the channel of flow lies between the aperture holes and the range finding lenses.