Inventor

HIRATA KOJI

JP282 patents

⚠️ This page may combine multiple inventors who share the name “HIRATA KOJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HIRATA KOJI

HITACHI LTD

Multi-display apparatus

Optical projection apparatus, transmission type screen, and projection type image display apparatus

Projection lens system and projection image display apparatus using the same

Projection display apparatus and projection lens device for use therein

Rear projection type image display apparatus and transmission type screen used therein

Rear projection type image display apparatus and transmission type screen used therein

Rear-projection screen and a rear projection image display employing the rear-projection screen

Rear projection screen and method of producing the same

Rear-projection type image display apparatus and rear-projection type screen

Projection type image display apparatus

Projection type image display apparatus

Projection type image display apparatus

Projection type image display apparatus

Projection type image display

Optical projection apparatus, transmission type screen, and projection type image display apparatus

Optical projection apparatus, transmission type screen, and projection type image display apparatus

Optical projection apparatus, transmission type screen, and projection type image display apparatus

Projection lens system and projection image display apparatus using the same

Projector light source and projection type image display device using the same

Lamp operation controller and controlling method of lamp operation

Optical unit and projection-type image display apparatus using the same

Image display device, rear projection type screen used in image display device, Fresnel lens sheet, and method of making Fresnel lens sheet

Light source for projector and projection type image display apparatus using thereof

Projection lens apparatus and rear projection type image display apparatus using the same

Projection-type picture display apparatus and screen used thereby

Projection lens apparatus and projection type image display apparatus

Semiconductor device

High speed heterojunction bipolar transistor, and RF power amplifier and mobile communication system using the same

Liquid crystal display apparatus and optical device for use therein

Rear-projection screen and a rear projection image display employing the rear-projection screen

Temperature compensating lens system for projection television

Video projector with optical color balance

Optical system for projection type image display device

Projection lens system

MAXELL LTD

Head-up display apparatus

In-vehicle information display system and information display apparatus

Head-up display apparatus

Information display device

Information display device

Vehicular lighting apparatus

HIRATA KOJI

Solid-state light source device

Projection display system including lens group and reflecting mirror

Projection type image display apparatus

HITACHI CONSUMER ELECTRONICS

Oblique projection optical system and projection type display apparatus using the same

Oblique projection optical system and projection type display apparatus using the same

(unassigned)

Projection display apparatus and projection lens device for use therein

PANASONIC CORP

Hydrodynamic bearing device, motor, and disk driving apparatus

FUJITSU LTD

Sheet conveying method and apparatus

OTAKE YOSUKE

MRI apparatus with RF surface coil having at least three resonance frequencies

HITACHI MAXELL

Pinhole array and display device using same