An image display device is a self-luminous type device including a light emitting portion, and a casing portion of a display device unit has a heat dissipating structure portion through which a part of the image display device is exposed for heat dissipation. In manufacturing the display device unit, when performing simple and reliable assembly while securing a high heat dissipation characteristic, for example, by using characteristics of a silicon substrate, high accurate positioning is performed in a display device positioning portion.

A cooling device, a light-source device, an image projection apparatus, and a wavelength converter. The cooling device includes a housing having a storage space, the storage space storing a heater and a base on which the heater is disposed, a heatsink at least partially disposed in the storage space and thermally connected to a space outside the storage space to dissipate heat generated by the heater to outside of the storage space, and an airflow path forming member covering at least some of the heatsink and forming a path for the heatsink to receive air flow absorbing the heat generated by the heater. In the cooling device, the heater or the base at least partially protruding from the airflow path member when the airflow path member is viewed in a direction orthogonal to a face of the heater on which light strikes.

A cooling device, a light-source device, an image projection apparatus, and a wavelength converter. The cooling device includes a housing having a storage space, the storage space storing a heater and a base on which the heater is disposed, a heatsink at least partially disposed in the storage space and thermally connected to a space outside the storage space to dissipate heat generated by the heater to outside of the storage space, and an airflow path forming member covering at least some of the heatsink and forming a path for the heatsink to receive air flow absorbing the heat generated by the heater. In the cooling device, the heater or the base at least partially protruding from the airflow path member when the airflow path member is viewed in a direction orthogonal to a face of the heater on which light strikes.

A light source apparatus according to an aspect of the present disclosure includes a circuit substrate that has a first surface and a second surface provided at the side opposite from the first surface and has a first opening passing through the first and second surfaces, a first light emitter that is electrically coupled to the circuit substrate and emits first light having a first wavelength band, and a thermal diffuser provided at the second surface of the circuit substrate, and the first light emitter is provided at the thermal diffuser exposed in the first opening.

A light source apparatus according to an aspect of the present disclosure includes a circuit substrate that has a first surface and a second surface provided at the side opposite from the first surface and has a first opening passing through the first and second surfaces, a first light emitter that is electrically coupled to the circuit substrate and emits first light having a first wavelength band, and a thermal diffuser provided at the second surface of the circuit substrate, and the first light emitter is provided at the thermal diffuser exposed in the first opening.

A first cooling apparatus includes a first heat sink having multiple first fins having a U-shaped opening and an O-shaped opening which are provide therein, a first heat receiving member configured to be brought into abutment with a heat source, and a first heat pipe which extends from one end which is connected with the heat receiving member towards the other end, and the first heat pipe has a first extending portion which extends from the one end, a bent portion which is bent from the first extending portion and at least a part of which is disposed inside the U-shaped opening, and a second extending portion which extends from the bent portion and at least a part of which is disposed inside the O-shaped opening.

A first cooling apparatus includes a first heat sink having multiple first fins having a U-shaped opening and an O-shaped opening which are provide therein, a first heat receiving member configured to be brought into abutment with a heat source, and a first heat pipe which extends from one end which is connected with the heat receiving member towards the other end, and the first heat pipe has a first extending portion which extends from the one end, a bent portion which is bent from the first extending portion and at least a part of which is disposed inside the U-shaped opening, and a second extending portion which extends from the bent portion and at least a part of which is disposed inside the O-shaped opening.

A projection device includes a housing, a spacer plate, and a heat dissipation module. The spacer plate is disposed in the housing to divide the housing into a first space and a second space. The heat dissipation module includes a radiator, a heat dissipation plate, a driving element, and a tube. The radiator is located in the first space, and the heat dissipation plate is located in the second space. The first space has a first air inlet and a first air outlet. A first cooling air flow enters the first space from the first air inlet, flows through the radiator, and is discharged from the first air outlet. The second space has a second air inlet and a second air outlet. A second cooling air flow enters the second space from the second air inlet, and is discharged from the second air outlet.

A projection device includes a housing, a spacer plate, and a heat dissipation module. The spacer plate is disposed in the housing to divide the housing into a first space and a second space. The heat dissipation module includes a radiator, a heat dissipation plate, a driving element, and a tube. The radiator is located in the first space, and the heat dissipation plate is located in the second space. The first space has a first air inlet and a first air outlet. A first cooling air flow enters the first space from the first air inlet, flows through the radiator, and is discharged from the first air outlet. The second space has a second air inlet and a second air outlet. A second cooling air flow enters the second space from the second air inlet, and is discharged from the second air outlet.

A projection device includes at least one heat source and a heat dissipation module. The heat dissipation module is connected to the heat source and is configured to dissipate heat energy generated by the heat source. The heat dissipation module includes a tank, at least one radiator, at least one cold plate, a cooling fluid, and a connection pipe. The connection pipe connects the tank, the radiator, and the cold plate, so that the cooling fluid flows in the heat dissipation module. The tank includes a pressure sensing device configured to measure a liquid level of the cooling fluid in the tank. Also, a tank is provided. The projection device provided in the disclosure can learn the liquid level of the tank in real-time, and the design cost is low.