Device for automatically adjusting angle of monitor on vehicle seat back

1. A device for automatically adjusting an angle of a monitor on a vehicle seat back, the device comprising:

a fixation bracket mounted on a front seat back upper-frame;

a first rotation bracket rotatably mounted on an upper portion of the fixation bracket via a first hinge pin;

a second rotation bracket rotatably mounted on a lower portion of the fixation bracket via a second hinge pin;

a monitor mounted on a front surface of the first rotation bracket such that the monitor faces in a rearward direction;

a motor mounted on a bottom surface of the second rotation bracket;

an angle adjustment bar integrally combined with a rear surface of the first rotation bracket;

a lead screw including: a lower portion rotatably connected to an output shaft of the motor, and an upper portion configured to pass through the second rotation bracket; and

an ascending and descending member having a threaded hole configured to engage with a threaded surface of the lead screw,

wherein a rotation of the lead screw is configured to cause the ascending and descending member to ascend and descend along the lead screw while being fastened by a hinge portion to an end portion of the angle adjustment bar.

2. The device of claim 1 , wherein a reinforcement bracket is mounted between the front seat back upper-frame and the fixation bracket.

3. The device of claim 2 , wherein the fixation bracket comprises:

a pair of upper lateral plates, to which the first rotation bracket is rotatably mounted about the first hinge pin;

a first mounting plate integrally combined with a front end portion of the pair of upper lateral plates and welded to the reinforcement bracket;

a pair of lower lateral plates, to which the second rotation bracket is rotatably mounted about the second hinge pin;

a second mounting plate integrally combined with a front end portion of the pair of lower lateral plates and welded to the front seat back upper-frame; and

a connection bar configured to connect upper end portions of the pair of upper lateral plates and the pair of lower lateral plates together.

4. The device of claim 1 , wherein the first rotation bracket comprises:

a monitor mounting plate on which the monitor is mounted; and

first rotation plates integrally respectively combined with both lateral end portions of the monitor mounting plate in a manner that protrudes frontward therefrom, the first rotation plates configured to be rotatably mounted on the fixation bracket via the first hinge pin, and

the angle adjustment bar is integrally combined with a rear surface of the monitor mounting plate in a manner that protrudes therefrom.

5. The device of claim 1 , wherein the second rotation bracket comprises:

a motor mounting plate having a through-hole through which the lead screw passes, the motor being mounted on a bottom surface of the motor mounting plate; and

a second rotation plates integrally respectively combined with both lateral end portions of the motor mounting plate in a manner that protrudes downward, the second rotation plates configured to be rotatably mounted on the fixation bracket via the second hinge pin.

6. The device of claim 1 , wherein when the lead screw and the angle adjustment bar make an angle of 90 degrees with respect to each other, a monitor mounting plate on which the monitor is mounted is held in a neutral position thereof.

7. The device of claim 6 , wherein, in a state where the monitor mounting plate is held in the neutral position, when the ascending and descending member ascends with the rotation of the lead screw in a first direction in the same position, and the angle adjustment bar is rotated rearward while pulling rearward the lead screw, the lead screw and an upper surface of the angle adjustment bar are configured to form an obtuse angle greater than 90 degrees with respect to each other and at the same time, the monitor mounting plate is rotated downward in the rearward direction.

8. The device of claim 6 , wherein, in a state where the monitor mounting plate is held in the neutral position, when the ascending and descending member descends with the rotation of the lead screw in a second direction in the same position, and the angle adjustment bar is rotated frontward while pulling rearward the lead screw, the lead screw and an upper surface of the angle adjustment bar are configured to form an acute angle smaller than 90 degrees with respect to each other and the monitor mounting plate is rotated upward in a frontward direction.

9. The device of claim 1 , further comprising:

a switch mounted in vicinity of a rear seat to adjust an angle of the monitor; and

a controller configured to perform a control that causes the motor to produce a rotary motion in a first direction or a second direction.

10. The device of claim 9 , wherein the controller is configured to receive a Hall sensor signal of a motor for rotating a front seat back frontward or a Hall sensor signal of the motor for reclining a rear seat back rearward, and, when it is determined that an angle by which the front seat back or the rear seat back is rotated frontward or reclined rearward is equal to or greater than a reference angle, the controller is configured to apply a drive signal to the motor for adjusting the angle of the monitor.