A projection optical apparatus includes a first housing, a second housing accommodated in the first housing, and a projection system accommodated in the second housing. The projection system includes a first reflector deflecting the optical path of the projection system. The first housing has a plurality of first openings that cause the interior of the first housing to communicate with the exterior of the first housing. The second housing has a plurality of second openings that cause the interior of the second housing to communicate with the exterior of the second housing.

A projection optical apparatus includes a first housing, a second housing accommodated in the first housing, and a projection system accommodated in the second housing. The projection system includes a first reflector deflecting the optical path of the projection system. The first housing has a plurality of first openings that cause the interior of the first housing to communicate with the exterior of the first housing. The second housing has a plurality of second openings that cause the interior of the second housing to communicate with the exterior of the second housing.

There is provided a projection lens that is mounted on a housing of a projection device including an electro-optical element. The projection lens comprises an optical system through which light passes, a second holding unit through which light parallel to a second optical axis passes and which is moved rotationally with respect to the housing, a third holding unit through which light parallel to a third optical axis obtained from bending of the second optical axis passes and which is moved rotationally with respect to the second holding unit, an electric drive unit that electrically controls rotational movement of the second holding unit with respect to the housing, rotational movement of the third holding unit with respect to the second holding unit, or drive of the optical system, and a cover part that covers the electric drive unit.

A projection apparatus projects an image by an optical system having at least one optical characteristic being variable, and the projection apparatus includes a processor configured to perform a control of regulating a movement of a projection region to which the image is projected, based on the at least one optical characteristic in the optical system.

A passenger service unit is provided. The passenger service unit includes at least one projector configured to project an image onto one or more display surfaces, at least one sensor configured to indicate a current position of the one or more display surfaces, and a projector controller in communication with the at least one projector and the at least one sensor. The projector controller is programmed to receive a signal from the at least one sensor indicating a current position of a display surface and instruct the at least one projector to project at least one image onto the tray table based on the current position of the display surface.

A passenger service unit is provided. The passenger service unit includes at least one projector configured to project an image onto one or more display surfaces, at least one sensor configured to indicate a current position of the one or more display surfaces, and a projector controller in communication with the at least one projector and the at least one sensor. The projector controller is programmed to receive a signal from the at least one sensor indicating a current position of a display surface and instruct the at least one projector to project at least one image onto the tray table based on the current position of the display surface.

A projection lens has a first rotary tube, a first fixed tube at which the first rotary tube is rotatably mounted, a first protrusion portion that is provided at the first rotary tube and that protrudes from the first rotary tube, and a first abutment surface that is provided at the first fixed tube and that abuts upon the first protrusion portion. The projection lens includes a first engaging portion at which the first protrusion portion and the first abutment surface include first engaging portions that face each other in a direction of a first incidence-side optical axis and a first pressing portion that presses the first protrusion portion against the first abutment surface.

A projection lens has a first rotary tube, a first fixed tube at which the first rotary tube is rotatably mounted, a first protrusion portion that is provided at the first rotary tube and that protrudes from the first rotary tube, and a first abutment surface that is provided at the first fixed tube and that abuts upon the first protrusion portion. The projection lens includes a first engaging portion at which the first protrusion portion and the first abutment surface include first engaging portions that face each other in a direction of a first incidence-side optical axis and a first pressing portion that presses the first protrusion portion against the first abutment surface.

A first holding barrel, a first mirror bending a first optical axis of the first holding barrel at 90°, a second holding barrel, a second mirror bending a second optical axis of the second holding barrel at 90°, and a third holding barrel are disposed on an optical axis from a screen side to an image forming panel. A first connection member connects the first holding barrel including the first mirror to the second holding barrel to be rotationally movable in increments of 90°. A second connection member connects the second holding barrel and the second mirror to the third holding barrel to be rotationally movable in increments of 90°. An orientation of a display image of the image forming panel is changed based on rotational movement states of an optical axis of a first sensor and an optical axis of a second sensor to make an orientation of a projection image on the screen match an original image.

A first holding barrel, a first mirror bending a first optical axis of the first holding barrel at 90°, a second holding barrel, a second mirror bending a second optical axis of the second holding barrel at 90°, and a third holding barrel are disposed on an optical axis from a screen side to an image forming panel. A first connection member connects the first holding barrel including the first mirror to the second holding barrel to be rotationally movable in increments of 90°. A second connection member connects the second holding barrel and the second mirror to the third holding barrel to be rotationally movable in increments of 90°. An orientation of a display image of the image forming panel is changed based on rotational movement states of an optical axis of a first sensor and an optical axis of a second sensor to make an orientation of a projection image on the screen match an original image.