Light-emitting element module, atomic oscillator, and electronic apparatus

An atomic oscillator comprising:

• a light-emitting element module, the light-emitting element module having:
• a Peltier device that includes a first substrate, and a second substrate causing a temperature difference from the first substrate, and a power terminal disposed on the first substrate;
• a light-emitting element that is disposed on a side of the second substrate of the Peltier device and of which temperature is adjusted by the Peltier device;
• a temperature sensor that is disposed on the side of the second substrate of the Peltier device;
• a package that includes a base and a lid joined to the base and accommodates the Peltier device and the temperature sensor;
• a heat dissipation member that is directly provided on an outer surface of the base and that is configured to dissipate heat from the base;
• a first external electrode that is disposed on an outer surface of the base and is electrically connected to the power terminal;
• a second external electrode that is disposed on the outer surface of the base and is electrically connected to the temperature sensor;
• and
• a third external electrode that is disposed on the outer surface of the base and is electrically connected to the light-emitting element;
• wherein the third external electrode is disposed between the first and second external electrodes when viewed in a first direction in which the light-emitting element and the Peltier device overlap each other;
• and
• wherein the heat dissipation member is located at a position closer to the first external electrode than the second external electrode when viewed in the first direction;
• an atomic cell that receives a light from the light-emitting element module so as to output a passed light;
• a light receiver that receives the passed light from the atomic cell so as to output a detection signal;
• and
• a controller that is configured to control the light-emitting element module based on the detection signal, the controller being configured to output a clock signal to an outside.

An electronic apparatus comprising:

• a light-emitting element module, the light-emitting element module having:
• a Peltier device that includes a first substrate, and a second substrate causing a temperature difference from the first substrate, and a power terminal disposed on the first substrate;
• a light-emitting element that is disposed on a side of the second substrate of the Peltier device and of which temperature is adjusted by the Peltier device;
• a temperature sensor that is disposed on the side of the second substrate of the Peltier device;
• a package that includes a base and a lid joined to the base and accommodates the Peltier device and the temperature sensor;
• a heat dissipation member that is directly provided on an outer surface of the base and that is configured to dissipate heat from the base;
• a first external electrode that is disposed on an outer surface of the base and is electrically connected to the power terminal;
• a second external electrode that is disposed on the outer surface of the base and is electrically connected to the temperature sensor;
• and
• a third external electrode that is disposed on the outer surface of the base and is electrically connected to the light-emitting element;
• wherein the third external electrode is disposed between the first and second external electrodes when viewed in a first direction in which the light-emitting element and the Peltier device overlap each other;
• and
• wherein the heat dissipation member is located at a position closer to the first external electrode than the second external electrode when viewed in the first direction;
• a signal receiver that receives an external signal;
• an atomic cell that receives a light from the light-emitting element module so as to output a passed light;
• a light receiver that receives the passed light from the atomic cell so as to output a detection signal;
• and
• a controller that is configured to control the light-emitting element module based on the detection signal, the controller being configured to output a clock signal to the signal receiver.