A high-frequency superposition module for an optical pickup that reduces the
number
of devices, facilitates scale-down and allows an oscillating circuit to be turned
off when a power supply for feeding a direct current to a laser diode is turned
off and an optical pickup using the high-frequency superposition module. An oscillating
circuit for feeding a high frequency to a laser diode comprises at least an active
element and passive elements such as capacitors, resistors, and inductors. A power
supply for feeding a direct current to the laser diode is also used as a power
supply for the oscillating circuit.
