Video projection apparatus

An image projection apparatus, comprising:

• a light modulation system;
• a projection optical system for projecting a two-dimensional image onto a surface to be projected with light from the light modulation system;
• image signal processing means for supplying an image signal to the light modulation system;
• a power supplying portion for supplying power to the light modulation system;
• a head portion that contains the projection optical system;
• a main body portion that contains the power supplying portion;
• a drive connection portion for connecting the head portion with the main body portion, in which the head portion and the main body portion can be relatively driven;
• and
• rotational angle detecting means for detecting a relative angle between the head portion and the main body portion.

An image projection apparatus, comprising:

• a light modulation system;
• a projection optical system for projecting a two-dimensional image onto a surface to be projected with light from the light modulation system;
• image signal processing means for supplying an image signal to the light modulation system;
• a power supplying portion for supplying power to the light modulation system;
• a head portion that contains the projection optical system;
• a main body portion that contains the power supplying portion;
• a drive connection portion for connecting the head portion with the main body portion, in which the head portion and the main body portion can be relatively driven;
• and
• distortion amount reducing means for detecting an angle between an optical axis of the projection optical system and the surface to be projected and reducing a distortion amount of the image projected onto the surface to be projected based on a result of the detection of the angle.

An image projection apparatus, comprising:

• a light modulation system;
• a projection optical system for projecting a two-dimensional image onto a surface to be projected with light from the light modulation system;
• image signal processing means for supplying an image signal to the light modulation system;
• a power supplying portion for supplying power to the light modulation system;
• a head portion that contains the projection optical system;
• a main body portion that contains the power supplying portion;
• and
• a drive connection portion for connecting the head portion with the main body portion, in which the head portion and the main body portion can be relatively driven,
• wherein provided that a length of the head portion based on a rotational axis of the drive connection portion in a direction orthogonal to the rotational axis of the drive connection portion is represented by L1, a distance between a center of gravity of the head portion and the rotational axis is 0.2 L1 or larger and 0.45 L1 or smaller.

An image projection apparatus, comprising:

• a light modulation system;
• a projection optical system for projecting a two-dimensional image onto a surface to be projected with light from the light modulation system;
• image signal processing means for supplying an image signal to the light modulation system;
• a power supplying portion for supplying power to the light modulation system;
• a head portion that contains the projection optical system;
• a main body portion that contains the power supplying portion;
• and
• a drive connection portion for connecting the head portion with the main body portion, in which the head portion and the main body portion can be relatively driven,
• wherein provided that a length of the head portion in a longitudinal direction thereof is represented by L1, a distance between a center of gravity of the head portion and the drive connection portion is 0.2 L1 or larger and 0.45 L1 or smaller.

An image projection apparatus, comprising:

• a light modulation system;
• a projection optical system for projecting a two-dimensional image onto a surface to be projected with light from the light modulation system;
• image signal processing means for supplying an image signal to the light modulation system;
• a power supplying portion for supplying power to the light modulation system;
• a head portion that contains the projection optical system;
• a main body portion that contains the power supplying portion;
• and
• a drive connection portion for connection the head portion with the main body portion, in which the head portion and the main body portion can be relatively driven,
• wherein provided that a weight of the head portion and a weight of the main body portion are represented by W1 and W2, respectively, the following conditional expression is satisfied:
• 1.5<W2/W1<3.