A projector comprises as mounted on a chassis a light source, a projection lens for projecting light on a screen, dichroic mirrors positioned on an optical path from the light source for separating light into R, G and B, and a relay lens disposed on the longest of optical paths of R, G, B and interposed between the dichroic mirror and the projection lens for causing the light on the longest path to reach the projection lens. An adjusting mechanism is mounted on the chassis for moving the relay lens upward, downward, leftward or rightward in a plane orthogonal to the optical path thereof. The relay lens is moved for adjustment to make the corresponding irradiating light to be incident on the liquid-crystal panel within a minimum required range of irradiation.
The present invention provides an HMD system for reducing a harmful influence on eyes and for providing enhanced presence. A screen display portion is moved by means of a driving mechanism based on a control signal output from a video playback device. Furthermore, the screen display portion 2 is moved according to how a wearer has reacted. Therefore, an intention of a producer of video software can be reflected in the HMD. Therefore, even in a case of a two-dimensional video without bidirectional property and with inflexible video unfolding, enhanced presence can be reliably provided to the wearer. Because a relationship between positions of eyeballs and the screen display portion is not fixed, the harmful influence on eyesight can be reduced. Furthermore, because the system has a driving mechanism 3, a gyro sensor portion 4, and a control portion 5 for the screen display portion 2, the screen display portion can be moved arbitrarily in any direction and the above control can be carried out accurately.
A liquid crystal projector of three-color type has three liquid crystal elements for modulating three primary color light bundles into three color optical images respectively. A recombination prism combines modulated three color optical images, and a projection lens system projects the combined full-color image on a screen. The projection lens system is constituted of the front lens group and the first and second rear lens groups. The front lens group and the rear lens groups are mounted to frames that are formed integrally on a prism base plate to which the recombination prism is fixed.
A projection lens (46) comprises: a cylindrical exterior case (621) having a lens-shifting through-hole (625) on a side thereof and an inner circumferential step or inner flange (623); a lens (610) of which outer periphery (611) on a first side is abutted to the inner circumferential step or inner flange (623); a flexible or elastic spacer (660) abutted to an outer periphery (612) of a second side of the lens (610); and a retainer (670) holding the spacer (660), where the lens (610) is fixed on the exterior case (621).
In order to prevent dust from sticking to the LCD panel, to prevent the LCD panel from being heated and to suitably adjust the position of the LCD panel, a duct is provided between cooling means for a light source and cooling means for a LCD panel to send cooling air from the LCD panel side to the light source side. Therefore, a light incidence/reflection plane of the LCD panel is disposed in an almost hermetically closed space and an optical path from an integrator lens to the LCD panel is formed in the almost hermetically closed space.
In order to prevent dust from sticking to the LCD panel, to prevent the LCD panel from being heated and to suitably adjust the position of the LCD panel, a duct is provided between cooling means for a light source and cooling means for a LCD panel to send cooling air from the LCD panel side to the light source side. Therefore, a light incidence/reflection plane of the LCD panel is disposed in an almost hermetically closed space and an optical path from an integrator lens to the LCD panel is formed in the almost hermetically closed space.
