Projection system
AssigneeJVCKENWOOD Corporation
InventorsNobuki Nakajima, Hiroyuki Takada
Life of this patent
Estimating the term…
Abstract
A projection system includes a projection device configured to simultaneously project a first image light for a first image and a second image light for a second image; an eyeglass-type device which is to be worn by a user and configured to include a first optical module configured to transmit the first image light projected by the projection device and a second optical module configured to transmit the second image light projected by the projection device; and at least one light source unit configured to emit a source light of wavelengths that are in a visible light band and have a transmittance equal to or less than a predetermined value in both the first optical module and the second optical module.
Claims3
A projection system comprising:
- a projection device configured to simultaneously project a first image light for a first image and a second image light for a second image on a projection screen;
- an eyeglass-type device which is to be worn by a user and configured to include a first optical module configured to transmit the first image light projected by the projection device and a second optical module configured to transmit the second image light projected by the projection device;
- light source units configured to emit, in a direction different from a direction of the projection screen, a source light of wavelengths that are in a visible light band and have a transmittance equal to or less than a predetermined value in both the first optical module and the second optical module;
- and
- a controller configured to control a wavelength of the source light and to obtain information indicating a projection state of the projection device, wherein
- a first light source unit of the light source units disposed closer to the projection screen has the wavelength closer to a wavelength band which is difficult for the user to visually recognize, and a second light source unit of the light source units disposed away from the projection screen has the wavelength closer to a wavelength band which is easy for the user to visually recognize,
- the light source units are further configured to:
- reduce the wavelength of the source light as a projecting state of the projection device is dark;
- and
- emit a sub-source light of a wavelength having a higher transmittance in both the first optical module and the second optical module than the transmittance of the source light when the controller obtains information indicating that the projection device is in a non-projecting state, wherein
- the projection system further comprises a sensor configured to detect an emergency situation in a facility provided with the projection system, wherein
- when the sensor detects the emergency situation, the light source units are further configured to switch the light to be emitted from the source light to the sub-source light of the wavelength having the higher transmittance in both the first optical module and the second optical module than the transmittance of the source light.
Dependencies are inferred from the claim text.