Panasonic Intellectual Property Management Co., Ltd.

Tsutomu Yoshikawa

Masahiro Inata

Hideo Onishi

Kenji Ikeo

A phosphor wheel includes a disk-shaped member that is rotated about a rotation axis, and a phosphor layer disposed on an outer face of the disk-shaped member. The disk-shaped member has a hollow-box structure that forms an enclosed space. A coolant is sealed in the enclosed space. The coolant evaporates to a gas state from a liquid state at more than or equal to a predetermined temperature. In the liquid state, a volume of the coolant is smaller than a capacity of the enclosed space. A light conversion device includes the phosphor wheel described above.

Phosphor wheel and light conversion device including the same

A light conversion device includes a phosphor wheel, a circulation fan, a motor, a casing unit, and a heat absorber. The phosphor wheel has a first side on which a phosphor layer is formed. The circulation fan blows an air flow to the phosphor layer. The motor rotatably drives the phosphor wheel. The casing unit houses the phosphor wheel, the circulation fan, and the motor. In the casing unit, a circulation path of the air flow created by the circulation fan is formed. The heat absorber is in the shape of a cylinder. The heat absorber includes a fin structure including a plurality of fins arranged along a radial direction of the casing unit and provided so as to extend in a height direction of the cylinder. The air flow is supplied to the heat absorber to cool the air flow that has absorbed heat generated at the phosphor layer.

Light conversion device and projection display apparatus including same

The phosphor wheel device includes a phosphor wheel, a circulation fan, a motor and a casing unit. The phosphor wheel is disc-shaped, and includes an annular phosphor layer formed on a first face and a plurality of openings disposed on an inner circumferential side. The circulation fan is mounted to a second face opposite to the first face, and blows air through the openings to the phosphor layer side. The motor drives and rotates the phosphor wheel and the circulation fan. The casing unit accommodates the phosphor wheel, the circulation fan, and the motor, and includes a circulation path formed for an airflow generated by the circulation fan to circulate. The casing unit includes an outer cylindrical portion and an inner cylindrical portion disposed substantially concentrically inside the outer cylindrical portion. Both ends of the outer cylindrical portion communicate with both ends of the inner cylindrical portion.

Fluorescent substance wheel device, light conversion device provided with same, and projection display apparatus

A lens barrel: an optical system; a focusing manipulation unit capable of changing a focal position of the optical system in a normal photographing area and in a macro photographing area where the focal position can be changed for an object located at a position shorter than a shortest distance position of the normal photographing area; a photographing mode switching unit for switching between a normal photographing mode and a macro photographing mode; and an index ring having a normal scale and a macro scale, the normal scale indicating an object distance in the normal photographing mode, and the macro scale indicating the object distance in the macro photographing mode. Then, the photographing mode switching unit switches a display position of the index ring between the normal scale and the macro scale, and the focusing manipulation unit changes the focal position displayed on the index ring by rotation manipulation.

Lens barrel and imaging apparatus

The periodic magnetic field generator includes a flat-shaped first yoke, and a plurality of main permanent magnets, an auxiliary permanent magnet, and a side permanent magnet on the first yoke. The plurality of main permanent magnets are magnetized in a first direction of generating magnetic fields, the direction being perpendicular to the first yoke, and disposed such that orientations of the magnetization become opposite alternately in the first direction. The auxiliary permanent magnet is magnetized in a second direction perpendicular to side faces of the plurality of main permanent magnets, and placed between the side faces of the main permanent magnets. The side permanent magnet is magnetized in a third direction perpendicular to the first direction, and disposed so as to cover end faces of the main permanent magnets and the auxiliary permanent magnet, the end faces being perpendicular to the side faces of the main permanent magnets.

Growing community of inventors

Nara, Japan

Tsutomu Yoshikawa