1. An improved mechanism for rotatable image-taking device, including: a rotatable mirror provided in front of a stationary image-taking device; and a reflective angle controlling mechanism provided to the rear of said mirror, wherein said mechanism comprises:
a support rod erected at the bottom face of said reflective angle controlling mechanism, and a central universal joint provided to the top thereof, wherein said central universal joint is pivoted to the center of the rear of said mirror;
a horizontal rotating device comprising: a first motor provided to the top thereof, a first rotating rod connected to a shaft of said first motor, a first universal joint rod with an end being pivotally connected to a side of said first rotating rod and another end being pivoted to the center of either a right side or left side of the rear of said mirror, a first detecting device provided to the bottom of said first rotating rod, wherein said first detecting device moves along with the rotation of said first rotating rod, so as to determine displacement along a horizontal-axis;
a vertical rotating device comprising: a second motor provided to one end thereof, a second rotating rod connected to a shaft of said second motor, a second universal joint rod with an end being pivotally connected to a side of said second rotating rod and another end being pivoted to the center of either an upper side or lower side of the rear of said mirror, a second detecting device provided to the other end of said second rotating rod, wherein said second detecting device moves along with the rotation of said second rotating rod, so as to determine displacement along a vertical-axis;
said mirror including: three universal joint supports, which are each provided to the center, either upper side or lower side, and either left side or right side of the rear of said mirror, for pivoting to the central, horizontal and vertical universal joints of said controlling mechanism.
2. The improved mechanism for the rotatable image-taking device of claim 1, wherein said detecting devices are either variable resistors, position encoders, or any angular sensing device.
3. The improved mechanism for the rotatable image-taking device of claim 1, wherein said mirror is one of a flat mirror, convex mirror, or concave mirror.
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 ballast stabilizer circuit, comprising:
a rectification unit configured to include diodes and full-wave rectify input commercial AC power;
a voltage switching control unit configured to receive the AC power full-wave rectified by the rectification unit, divide magnitudes of the AC power depending on phases of voltage, and perform switching control such that low-voltage portions of the divided voltages, having low phases, are used as heating power for heating filaments of a fluorescent tube, and high-voltage portions of the divided voltages, having high phases, are used as discharge voltage of the fluorescent tube;
a low-voltage switching unit connected to an output of the voltage switching control unit, and configured to switch on and off the heating power for heating the filaments of the fluorescent tube in response to an output signal of the voltage switching control unit;
and a high-voltage switching unit connected to the output of the voltage switching control unit and configured to form a Pulse-Width-Modulation (PWM) circuit for pulse-width-modulating the high-voltage portions and then applying the lighting power of the fluorescent tube, thereby switching on power for discharge of the fluorescent tube in response to the output signal of the voltage switching control unit,
wherein the voltage switching control unit comprises, inside the rectification unit:
resistors connected in series and configured to divide voltage magnitude according to phases of the full-wave rectified power based on resistance ratio;
a first transistor connected between the resistors at base terminal thereof and connected at a collector terminal to the rectification unit via a resistor, and at an emitter terminal thereof to the rectification unit;
a second transistor connected at a base terminal thereof to the collector terminal of the first transistor via resistors, and at an emitter terminal thereof to the rectification unit; and
a third transistor connected at a base terminal thereof to the collector terminal of the second transistor, and at a collector terminal thereof to the low-voltage switching unit and the high-voltage switching unit.
2. The ballast stabilizer circuit as set forth in claim 1, further comprising a negative feedback circuit located on an output side of the high-voltage switching unit, and configured to adjust brightness to a constant output by detecting an amount of discharge of the fluorescent tube and controlling output power depending on the detected amount of discharge, and to control a magnitude of the heating power applied to the filaments by controlling the low-voltage switching unit.
3. The ballast stabilizer circuit as set forth in claim 2, wherein the negative feedback circuit is constructed by dividing the sixth transistor into two separated transistors, one transistor of which switches on and off power for heating the filaments of the fluorescent tube, and a remaining transistor of which switches on and off the high voltage for the turning on of the fluorescent tube, and includes a resistor at the emitter terminal of the remaining transistor that switches on and off the high voltage for the turning on of fluorescent tube, thereby detecting current flowing through the resistor, and then decreasing the power applied to the one transistor that switches on and off the power for heating the filaments, when the fluorescent tube is turned on.
4. The ballast stabilizer circuit as set forth in claim 1, wherein the low-voltage switching unit comprises a fifth transistor and a sixth transistor that are connected at base terminals thereof to the collector terminal of the third transistor via diodes and resistors and switch on and off the heating power for heating the filament of the fluorescent tube.
5. The ballast stabilizer circuit as set forth in claim 1, wherein the high-voltage switching unit comprises a fourth transistor connected at a base terminal thereof to the collector terminal of the third transistor of the voltage switching control unit via a resistor, and the PWM circuit connected to the collector terminal of the fourth transistor and configured to pulse-width modulates input power in response to the operation of the fourth transistor and apply lighting power of the fluorescent tube.