Projector with a linearly adjustable zoom projection lens

1. A projector, comprising:

a case, having an opening provided thereon;

a zoom lens passed through a hole of the case and extended toward outside, the zoom lens having a zoom rod extended from one lateral of a column of the zoom lens, and moving the zoom rod being able to regulate a focal length of the zoom lens;

a zoom ring disposed within the case and nearby the opening, the zoom ring having an arc surface, an interior of the arc surface female-contacted with the lateral of the column, a groove provided in an interior of the arc surface to cooperate with the zoom rod, the zoom ring moved back and forth along the arc surface to control the zoom rod, a control rod disposed on an exterior of the arc surface, the opening elongated along the arc surface and a rectangular form; and

a control plate mounted on the case and laid over the opening movably, a lodging element provided on one side of the control plate, and movably contacted with the control rod, a handle provided on another side of the control plate and extended outside the surface of the projector,

wherein the handle accepts the force along the extending direction of the opening of rectangular shape so as to let the control plate move the lodging element along the extending direction of the opening of rectangular shape and further to move the control rod for continuously regulating the focal length of the zoom lens.

2. The projector of claim 1 , wherein two tracks are disposed on two different sides of the opening respectively along two long sides of the rectangular opening, two opposite laterals of the control plate are provided to cooperate with the tracks for attaching the case so as to lay over the opening from the outside of the case so as to let the control plate move along the tracks, the lodging element extends into the case from the outside of the case to contact with the control rod movably.

3. The projector of claim 1 , wherein two tracks are disposed on two different sides of the opening respectively along two long sides of the rectangular opening, two opposite laterals of the control plate are provided to cooperate with the tracks for attaching the case so as to lay over the opening from the outside of the case so as to let the control plate move along the tracks, the handle extends to the outside of the case from an inside of the case through the opening.

4. The projector of claim 1 , wherein the opening is provided on an upper surface of the case.

5. The projector of claim 4 , wherein the zoom ring female-connects to an upper lateral surface of the column of the zoom lens and is sandwiched between the opening and the zoom lens.

6. The projector of claim 5 , wherein the lodging element of the control plate extends downward, and the handle extends upward.

7. The projector of claim 1 , wherein the zoom lens extends toward a front exterior of the projector through the hole, the extending direction of the arc surface of the zoom ring and the extending direction of the long sides of the opening extending are both along the two long sides of the case, a zoom lens set of the zoom lenses moves along the zoom lens back and forth.

8. The projector of claim 1 , wherein the lodging element comprises two parallel barricades extending toward outside.

9. The projector of claim 8 , wherein a protruding member vertically extends from a peripheral of the arc surface of the zoom ring, the protruding member traverses and is orthogonal to the arc surface of the zoom ring and extended to the control rod, the control rod is a cylinder and traversed between two barricades so as to let the lodging element movably contact with the control rod.

10. A projector, comprising:

a case, an opening provided thereon;

a zoom lens having a zoom rod, the zoom rod extended from one lateral of a column of the zoom lens, being capable of regulating the focal length of the zoom lens;

a zoom ring having an arc surface, an interior of the arc surface female-contacted with the lateral of the column, a groove provided in the interior of the arc surface to cooperate with the zoom rod, a control rod disposed on an exterior of the arc surface; and

a control plate mounted on the case and laid over the opening accordingly, a lodging element provided on one side of the control plate, and movably contacted with the control rod, a handle being provided on another side of the control plate and capable of moving along the extending direction of long sides of the opening of rectangular shape so as to control the control rod and the zoom rod for regulating the focal length of the zoom lens.