`
`1. Aprojection direction change device, comprising:
`
`a mirror that reflects light emitted from a projection lens unit of
`
`a projector;
`
`a mirror support part that rotatably supports the mirror around
`
`a first axis and a second axis;
`
`a first drive part that rotary drives the mirror around the first
`
`axis; and
`
`10
`
`a second drive part that rotary drives the mirror around the
`
`second axis,
`
`wherein an intersecting point of the first and second axes is
`
`positioned closer
`
`to the projection lens unit
`
`than a geometric
`
`barycenter of the mirror is.
`
`15
`
`2. The projection direction change device of claim 1,
`
`further
`
`comprising a mirror frame to which the mirror is attached,
`
`wherein the mirror support part rotatably supports the mirror
`
`frame to which the mirror has been attached around the first and
`
`20
`
`second axes, and
`
`wherein weight balance of the mirror frame has been adjusted so
`
`that a barycenter of the mirror frame to which the mirror has been
`
`attached is positioned closer to the intersecting point of the first and
`
`second axes than the geometric barycenter of the mirror is.
`
`25
`
`3. The projection direction change device of claim 2, wherein the
`
`weight balance of the mirror frame has been adjusted so that the
`
`27
`
`
`
`barycenter of the mirror frame to which the mirror has been attached
`
`is positioned at the intersecting point of the first and second axes.
`
`4, The projection direction change device of claim 8, wherein the
`
`mirror frame includes a rib for adjusting the weight balance.
`
`5. The projection direction change device of claim 2, wherein the
`
`mirror frame has a through hole for adjusting the weight balance.
`
`10
`
`6. The projection direction change device of claim 1, wherein the
`
`mirror has a hexagonal shape in which a side closer to the projection
`
`lens unit is shorter than a side that is opposite to the projection lens
`
`unit and is counter to the side closer to the projection lens unit.
`
`15
`
`7. The projection direction change device of claim 1,
`
`further
`
`comprising a mirror controller that indicates a drive amount of the
`
`mirror to the first and second drive parts.
`
`8. The projection direction change device of claim 7,
`
`further
`
`20
`
`comprising an attitude sensor that detects a state of an attitude of the
`
`mirror,
`
`wherein the mirror controller adjusts a drive amount of the mirror
`
`based on the state of an attitude.
`
`25
`
`9. The projection direction change device of claim 1,
`
`further
`
`comprising a position adjustment mechanism that allows the mirror to
`
`be displaced along a direction of projection from the projection lens
`
`28
`
`
`
`unit.
`
`and
`
`10. An image projection system comprising:
`
`the projection direction change device of claim 7;
`
`the projector that projects an image;
`
`an image output device that outputs an image to the projector:
`
`a controller that sends a command signal about the attitude of
`
`the mirror to the mirror controller and outputs an image output signal
`
`10
`
`synchronized with the command signal to the image output device.
`
`11. The image projection system of claim 10,
`
`wherein the projector includes a lens driver that moves some or all
`
`lenses in the projection lens unit along or in parallel with a projection
`
`15
`
`direction, and
`
`wherein the lens driver adjusts a projection function of the
`
`projector in collaboration with drive control of the mirror of the
`
`projection direction change device based on a command signal from the
`
`controller.
`
`20
`
`12. The image projection system of claim 11, wherein the lens
`
`driver performs zoom adjustment of the projection lens unit.
`
`13. The image projection system of claim 11, wherein the lens
`
`25
`
`driver performs focus adjustment of the projection lens unit.
`
`14. The image projection system of claim 11, wherein the lens
`
`29
`
`
`
`driver performs shift adjustment of the projection lens unit.
`
`30
`
`
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