Illumination device and illumination system

1. An illumination device, comprising: a light source unit having a light emitting panel; and a mounting unit attached to a non-light-emission surface of the light source unit, wherein the mounting unit includes a circuit board for controlling energization of the light emitting panel and a housing having a circuit board reception portion receiving the circuit board, and an attachment surface to attach to the non-light-emission surface of the light source unit, the circuit board includes a connection terminal configured to be connected to an external conductor for electrically interconnecting the circuit board and an external device, the connection terminal is arranged inward of an outer peripheral end of the attachment surface, the circuit board reception portion protrudes from the attachment surface toward the light source unit and a protruding dimension of the circuit board reception portion from the attachment surface is greater than a dimension of the external conductor along a protruding direction of the circuit board reception portion, and a clearance is provided between the non-light-emission surface of the light source unit and the attachment surface of the mounting unit to provide a space for accommodating the external conductor in a state that the external conductor is connected to the connection terminal and the mounting unit is attached to the light source unit.

2. The device of claim 1 , wherein the connection terminal and the external conductor are connected to each other by a connector of the connection terminal and a connector of the external conductor, the connector of the connection terminal being arranged to face toward the outside of the mounting unit.

3. The device of claim 2 , wherein the connector of the connection terminal is arranged to face the external device.

4. The device of claim 3 , wherein the connection terminal includes a power receiving portion for receiving electric power from the external device, a signal receiving portion for receiving a control signal from the external device, a power transmitting portion for transmitting the electric power received by the power receiving portion to another external device and a signal transmitting portion for transmitting the control signal received by the signal receiving portion or a signal generated pursuant to the control signal to the another external device, the power receiving portion and the signal receiving portion being arranged to adjoin to each other, the power transmitting portion and the signal transmitting portion being arranged to adjoin to each other.

5. The device of claim 3 , further comprising:

a lead-wire wiring adjustment portion for guiding a flexible lead wire making up the external conductor and for adjusting a direction in which the lead wire is led out to the outside of the illumination device,

wherein the lead-wire wiring adjustment portion includes a first guide for leading out the lead wire in a first direction toward which the connector of the connection terminal faces, a second guide for leading out the lead wire in a second direction orthogonal to the first direction and parallel to a surface of the mounting unit mounted to the light source unit, and a third guide for leading out the lead wire in a third direction opposite to the second direction.

6. The device of claim 2 , further comprising:

a lead-wire wiring adjustment portion for guiding a flexible lead wire making up the external conductor and for adjusting a direction in which the lead wire is led out to the outside of the illumination device,

wherein the lead-wire wiring adjustment portion includes a first guide for leading out the lead wire in a first direction toward which the connector of the connection terminal faces, a second guide for leading out the lead wire in a second direction orthogonal to the first direction and parallel to a surface of the mounting unit mounted to the light source unit, and a third guide for leading out the lead wire in a third direction opposite to the second direction.

7. The device of claim 1 , wherein the connection terminal includes a power receiving portion for receiving electric power from the external device and a power transmitting portion for transmitting the electric power received by the power receiving portion to another external device.

8. The device of claim 1 , wherein the connection terminal includes a signal receiving portion for receiving a control signal from the external device and a signal transmitting portion for transmitting the control signal received by the signal receiving portion or a signal generated pursuant to the control signal to another external device.

9. The device of claim 1 , further comprising:

a lead-wire wiring adjustment portion for guiding a flexible lead wire making up the external conductor and for adjusting a direction in which the lead wire is led out to the outside of the illumination device.

10. An illumination system comprising the illumination device of claim 1 .

11. The illumination device according to claim 1 , the attachment surface comprising a planar surface of said housing.

12. The illumination device according to claim 1 , the circuit board comprising a generally planar member, the circuit board reception portion comprising an aperture in the housing, the circuit board being received within the circuit board reception portion such that the circuit board extends in a plane generally parallel to the plane of the light emitting panel.

13. The illumination device according to claim 1 , each of the housing and the circuit board comprising a generally planar member, the circuit board being received within the circuit board reception portion and extending in a plane generally parallel to the plane of the housing.

14. The illumination device according to claim 1 , wherein the light emitting panel comprises an active light emitting panel as a light source.