A space flight simulator includes: a celestial-body-position output unit configured to output three-dimensional positions of extragalactic celestial bodies in space; an observation-position designation unit configured to allow an operator to designate a three-dimensional position and a posture of an observer in extragalactic space; a celestial-body-image arrangement unit configured to determine, based on the output from the celestial-body-position output unit, arrangement of an image of each extragalactic celestial body in a star field seen from the designated three-dimensional position and posture of the observer, and generate a star field image; a cosmic-expansion selection unit configured to allow the operator to perform selection as to whether a cosmic expansion effect is taken into account; a time designation unit configured to designate an observation time; and a cosmic-expansion correction unit configured to correct the three-dimensional position of each extragalactic celestial body based on the cosmic expansion effect and the designated observation time.

The present invention addresses the problem of providing a video display device that projects and displays video including starry sky images onto a target surface, that can reproduce the twinkling of stars and that can more faithfully reproduce an actual starry sky. Provided are a light source, a projection lens, a starry-sky projection negative plate, a twinkling negative plate with uneven light-transmitting properties, a starry-sky-end support unit that supports the starry-sky projection negative plate in a location onto which light from the light source is radiated, a twinkling-end support unit that supports the twinkling negative plate between the starry-sky projection negative plate and the projection lens or between the light source and the starry-sky projection negative plate, and an actuation mechanism that rotationally actuates, by power from an actuator, the starry-sky projection negative plate in a state of being supported by the starry-sky-end support unit and the twinkling negative plate in a state of being supported by the twinkling-end support unit. Light that has penetrated the starry-sky projection negative plate and the twinkling negative plate is radiated onto the target surface via the projection lens.

The present invention addresses the problem of providing a video display device that projects and displays video including starry sky images onto a target surface, that can reproduce the twinkling of stars and that can more faithfully reproduce an actual starry sky. Provided are a light source, a projection lens, a starry-sky projection negative plate, a twinkling negative plate with uneven light-transmitting properties, a starry-sky-end support unit that supports the starry-sky projection negative plate in a location onto which light from the light source is radiated, a twinkling-end support unit that supports the twinkling negative plate between the starry-sky projection negative plate and the projection lens or between the light source and the starry-sky projection negative plate, and an actuation mechanism that rotationally actuates, by power from an actuator, the starry-sky projection negative plate in a state of being supported by the starry-sky-end support unit and the twinkling negative plate in a state of being supported by the twinkling-end support unit. Light that has penetrated the starry-sky projection negative plate and the twinkling negative plate is radiated onto the target surface via the projection lens.

To provide a projection-type image display apparatus which projects an image on a dome screen and a dome type screen apparatus for image projection.

An image display apparatus 100 includes a dome screen 101, a support body 102 configured to support the dome screen 101 so that the dome screen 101 is rotatable around a horizontal axis, two projectors 103 and 104 and a display control apparatus 105, and a chair 106 on which a viewer sits is provided inside space. By rotating the dome screen 101, it is possible to expand a viewing field in a vertical direction.

In an image projection device including a laser beam source and a diffractive optical element provided on an optical path of a laser beam L from the laser beam source, a transparent member having a refractive index higher than that of an area ahead of an emission surface on the optical path of the laser beam L and a diffractive optical element is formed on an emission surface of the transparent member. The laser beam L is obliquely incident on the diffractive optical element. The diffractive optical element generates a diffraction image in an area which is not overlapped with zeroth order light LR of the laser beam L and an area occupied by a conjugate image, and is arranged in a direction to irradiate a screen with diffracted light forming the diffraction image while substantially eliminating the zeroth order light and the diffracted light forming the conjugate image.

[Technical Problem]

It was difficult to replicate the wide-ranging brightness magnitude of tiny stars through the starry sky reproduction apparatus to replicate the whole sky with details as deeply as the observation through astronomical telescopes.

[Solution to Problem]

According to the present invention, the starry sky reproduction apparatus is a laminating sheet that is pasted up N layers (N2) of light reducing effect sheet. Under the condition that M and L is integer number, magnitude is NM>L1, and when the laminating sheet is stacked L layers, the L-Layer light transmittable through hole will be formed. Light beam can go over the sheet passing through the hole. Additionally, M-Layer light transmittable through hole is formed under the condition that the laminating sheet is stacked M layers, and the hole is located in the different position of the L-Layer light transmittable through hole, then the L layer-transit beam, which passes through the L-Layer light transmittable through hole, and the M layer-transit beam, which passes through the M-Layer light transmittable through hole, can be observed as 2 different transmitted light with different brightness magnitude. That can be happened with the difference of the light redaction-ratio between the L and M beams.

[Technical Problem]

It was difficult to replicate the wide-ranging brightness magnitude of tiny stars through the starry sky reproduction apparatus to replicate the whole sky with details as deeply as the observation through astronomical telescopes.

[Solution to Problem]

According to the present invention, the starry sky reproduction apparatus is a laminating sheet that is pasted up N layers (N2) of light reducing effect sheet. Under the condition that M and L is integer number, magnitude is NM>L1, and when the laminating sheet is stacked L layers, the L-Layer light transmittable through hole will be formed. Light beam can go over the sheet passing through the hole. Additionally, M-Layer light transmittable through hole is formed under the condition that the laminating sheet is stacked M layers, and the hole is located in the different position of the L-Layer light transmittable through hole, then the L layer-transit beam, which passes through the L-Layer light transmittable through hole, and the M layer-transit beam, which passes through the M-Layer light transmittable through hole, can be observed as 2 different transmitted light with different brightness magnitude. That can be happened with the difference of the light redaction-ratio between the L and M beams.

The invention relates to an optical system for restoring a natural image combined with a digital image, in order to characterise and highlight the objects represented on the natural image. The optical system includes an objective lens, an eyepiece, a semi-reflective plate, a processing unit, capturing means and restoring means. The invention also relates to a method for producing such a digital image.

The invention relates to an optical system for restoring a natural image combined with a digital image, in order to characterise and highlight the objects represented on the natural image. The optical system includes an objective lens, an eyepiece, a semi-reflective plate, a processing unit, capturing means and restoring means. The invention also relates to a method for producing such a digital image.

A dynamic lunar eclipse lamp is provided, which includes a blocking piece including a transparent area and a circular opaque area, the opaque area is provided at a non-central position of the blocking piece; an imaging lens provided on one side of the blocking piece, one end of the imaging lens is provided with a Fresnel lens, a non-central position on the Fresnel lens is provided with an image, and the imaging lens is configured to project the image onto a non-central position on the blocking piece, a position of the image projected by the imaging lens corresponds to a position of the opaque area on the blocking piece; a rotary drive component connected to the Fresnel lens and configured to drive the Fresnel lens to rotate; and a light source component, the lamp is caused to form a lunar eclipse effect, a crescent or a half-moon display effect.