Surveillance television camera
A surveillance television camera includes a base mounted on an installation surface, a rotating disc rotatably mounted on the base, a tilt shaft mounted on the installation disc for holding the surveillance television camera, the tilt shaft and the rotating disc being remotely controlled so as to be rotated, and a protecting cover mounted on the base mounted on the installation surface so as to cover the camera.
1. A surveillance television camera comprising:
a base mounted on an installation surface;
a rotating disc rotatably mounted on the base;
a tilt shaft mounted on the installation disc for holding the surveillance television camera, the tilt shaft and the rotating disc being remotely controlled so as to be rotated; and
a domed protecting cover mounted on the base mounted on the installation surface so as to cover the camera; and
a means for setting and limiting a rotational angle of said tilt shaft to be smaller when the domed protecting cover is attached to said base than when said domed protecting cover is detached from said base, whereby distortion of an image from said surveillance television camera by curvature of said domed protecting cover is prevented when said domed protecting cover is attached.
2. The surveillance television camera according to claim 1 , further comprising a dust protecting cover detachably mounted on the base so as to only cover a space defined between the base and the disc when the domed protecting cover is detached from the base, whereby dust is prevented from entering the surveillance television camera when the domed protective cover is detached.
3. The surveillance television camera according to claim 1 , further comprising a sensor detecting attachment or detachment of the domed protecting cover, thereby generating a signal, wherein a rotational angle of the tilt shaft is set and limited to a previously set rotational angle on the basis of the signal generated by the sensor.
4. The surveillance television camera according to claim 2 , further comprising a sensor detecting attachment or detachment of the domed protecting cover, thereby generating a signal, wherein said rotational angle of the tilt shaft is set and limited to a previously set rotational angle on the basis of the signal generated by the sensor.
5. The surveillance television camera according to claim 1 , wherein each of said domed and dust protecting cover is detachably attached to the base by bayonet connection.
6. The surveillance television camera according to claim 2 , wherein each of said domed and dust protecting cover is detachably attached to the base by bayonet connection.
7. The surveillance television camera according to claim 3 , wherein each of said domed and dust protecting cover is detachably attached to the base by bayonet connection.
8. The surveillance television camera according to claim 4 , wherein each of said domed and dust protecting cover is detachably attached to the base by bayonet connection.
9. The surveillance television camera according to claim 5 , wherein said domed protecting cover comprises a translucent cylindrical portion and a transparent dome-shaped portion and said bayonet connection is provided on said translucent cylindrical portion.
10. The surveillance television camera according to claim 3 , wherein said sensor comprises a limit switch on said base and a protrusion on said cylindrical portion of said protective cover wherein said protrusion engages said limit switch when said protective cover is attached to said base.
11. The surveillance television camera according to claim 2 , wherein said dust protecting cover is ring shaped.