Optical device for bar-code reading, method for manufacturing an optical device, and light projection/receiving package

A method for manufacturing an optical device for bar-code reading, comprising the steps of:

• fitting a light projection lens into a penetrating hole formed in a light receiving lens to penetrate a plane of incidence of light and a plane of outgoing of light in a manner freely movable along an optical axis of said light projection lens;
• fixing said light receiving lens after positioning said light receiving relative to a light receiving element;
• and
• fixing the light projection lens after positioning the light projection lens relative to said positioned and fixed light receiving lens.

A light projection/receiving package comprising:

• a die pad;
• a light emitting element and a light receiving element respectively mounted back to back on front and rear planes of said die pad;
• an optical path bending means provided on one plane of said die pad on which said light emitting element is mounted to bend an advancing direction of the emitted light from said light emitting element approximately at right angles;
• and
• a penetrating hole formed in said die pad to allow the light having the advancing direction bent by said optical path bending means to pass through towards the other plane of said die pad on which said receiving element is mounted.