Abstract: A light source device includes: a combined body including light emitting portions including: a first light emitting portion including a first light emitting element, and a second light emitting portion provided separately from and along an outer periphery of the first light emitting portion in a plan view, the second light emitting portion including a plurality of second light emitting elements; and a lens disposed above the combined body. The first light emitting element and the plurality of second light emitting elements are arrayed in first and second directions that are perpendicular to each other. The first light emitting element and the plurality of second light emitting elements are controllable to be lit independently.

Abstract: A signal output circuit includes a slope control circuit, a capacitor, a noise detector circuit and a fail-safe circuit. The slope control circuit charges and discharges the capacitor, the first terminal of which is connected to an output terminal, according to the control signal level, and drives transistors using the voltage of the second terminal of the capacitor, thereby controlling the slope of the output single. The noise detector circuit detects noise superimposed on the output terminal. When noise is detected, the fail-safe circuit performs a forced drive operation on the transistor to output the output signal at a level corresponding to the level of the control signal is output, regardless of the transistor being driven by the slope control circuit.

Abstract: A protection circuit includes a periodicity determination device, an off circuit and a control device. The periodicity determination device directly or indirectly detects a noise superimposed on a first transistor including a control terminal and determines periodicity of the noise. The off circuit is connected to the control terminal of the first transistor and is configured to perform an off-operation of the first transistor. The control device enables the off-operation of the first transistor, performed by the off circuit, when the periodicity determination device determines that the noise has periodicity. The control device disables the off-operation of the first transistor, performed by the off circuit, when the periodicity determination device determines that the noise does not have periodicity. Accordingly, the protection circuit withdraws an ESD energy while stabilizing a circuit operation.

Abstract: A signal output circuit includes a slope control circuit, a capacitor, a noise detector circuit and a fail-safe circuit. The slope control circuit charges and discharges the capacitor, the first terminal of which is connected to an output terminal, according to the control signal level, and drives transistors using the voltage of the second terminal of the capacitor, thereby controlling the slope of the output single. The noise detector circuit detects noise superimposed on the output terminal. When noise is detected, the fail-safe circuit performs a forced drive operation on the transistor to output the output signal at a level corresponding to the level of the control signal is output, regardless of the transistor being driven by the slope control circuit.

Abstract: A protection circuit includes a periodicity determination device, an off circuit and a control device. The periodicity determination device directly or indirectly detects a noise superimposed on a first transistor including a control terminal and determines periodicity of the noise. The off circuit is connected to the control terminal of the first transistor and is configured to perform an off-operation of the first transistor. The control device enables the off-operation of the first transistor, performed by the off circuit, when the periodicity determination device determines that the noise has periodicity. The control device disables the off-operation of the first transistor, performed by the off circuit, when the periodicity determination device determines that the noise does not have periodicity. Accordingly, the protection circuit withdraws an ESD energy while stabilizing a circuit operation.