1. A lens shifting device, comprising:
a first plate through which projected video light passes;
a second plate connected to the first plate via an elastic member and having a projection lens attached to a position into which the projected video light that passed through the first plate enters;
a slider disposed in the second plate and housed in the first plate to be movable in a predetermined direction intersecting a video optical axis where the projected video light advances; and
a guide shaft attached to the first plate in a state of being engaged with the slider to move the second plate according to rotation,
wherein the elastic member is disposed between the first plate and the second plate to connect the first plate and the second plate in a state of generating an elastic contraction force, and
wherein the lens shifting device further comprises:
a guide pin disposed in the second plate to project toward the first plate; and
a guide slit formed in the first plate to be long and thin in the predetermined direction, through which the guide pin is inserted when the first plate and the second plate are connected.
2. The lens shifting device according to claim 1, further comprising a projected portion formed in the second plate to be brought into contact with the first plate when the first plate and the second plate are connected, wherein the projection length of the projected portion is longer than the natural length of the elastic member.
3. A projection display device comprising the lens shifting device according to claim 1.
4. A projection display device comprising the lens shifting device according to claim 2.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A switch comprising:
an input terminal to which a high frequency signal is input;
a first switching unit connected between the input terminal and a first output terminal from which the high frequency signal input to the input terminal is output, and selectively outputting the high frequency signal input to the input terminal through the first output terminal; and
a second switching unit connected between the input terminal and a second output terminal from which the high frequency signal input to the input terminal is output, and selectively outputting the high frequency signal input to the input terminal through the second output terminal,
wherein the first switching unit includes:
a first impedance transformer installed on a first signal line between the input terminal and the first output terminal and transforming impedance;
a first bipolar transistor having an emitter grounded, a collector connected to the first signal line, and a base receiving a current according to a first control voltage applied thereto, the first control voltage controlling a switching operation in the first switching unit; and
a second bipolar transistor having a collector grounded, an emitter connected to the first signal line, and a base receiving the current according to the first control voltage applied thereto, and
the second switching unit includes:
a second impedance transformer installed on a second signal line between the input terminal and the second output terminal and transforming impedance;
a third bipolar transistor having an emitter grounded, a collector connected to the second signal line, and a base receiving a current according to a second control voltage applied thereto, the second control voltage controlling a switching operation in the second switching unit; and
a fourth bipolar transistor having a collector grounded, an emitter connected to the second signal line, and a base receiving the current according to the second control voltage applied thereto.
2. The switch of claim 1, wherein the first switching unit further includes a capacitor of which one end is connected to the base of the second bipolar transistor and the other end is grounded.
3. The switch of claim 1, wherein the second switching unit further includes a capacitor of which one end is connected to the base of the fourth bipolar transistor and the other end is grounded.