JP6985835B2 - Stands and television equipment - Google Patents

Description

The present invention relates to a stand and a television device, and more particularly to a stand and a television device used to hold a display device.

This type of stand is attached, for example, to the bottom of a thin display device such as a television or monitor to hold the display device.
Further, in order to make the display screen face the viewer, the display device is required to have a function of moving the orientation of the display screen to the left or right (also referred to as a swivel function) regardless of the size of the display screen. It is said that the presence or absence of this swivel function greatly affects the purchasing decisions of consumers.

In recent years, with the spread of IoT (Internet of Things) and the like, it is required to remotely control a display device from a remote location, and it is possible to rotate the display screen frequently.
When the drive mechanism is frequently started and stopped in order to rotate the display screen, the drive mechanism and the peripheral member are fastened due to the vibration of the drive mechanism and the peripheral member and the impact of the drive mechanism and the peripheral member. May loosen. For example, Patent Document 1 discloses a technique for preventing a component (screw for fixing a rotation angle sensor) that rotates with a drive shaft from falling off.

Japanese Unexamined Patent Publication No. 2008-279887

By the way, there is one with a gear attached to the lower end of the drive shaft. Even if the drive shaft and the gear are loosely fastened and the gear is separated from the drive shaft, it is necessary to move the gear together with the drive shaft. However, the screw described in Patent Document 1 may hinder the movement because the flat surface portion of the head is rubbed. Therefore, a configuration that maintains smooth movement of the gear is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stand and a television device for maintaining smooth movement of gears.

In order to solve the above problems, the first technical means of the present invention is a stand used for holding a display device, and the stand rotates with respect to the base portion and the base portion. The support unit includes a support unit for holding the display device, and the support unit has a drive shaft for rotating the display screen of the display device and a movable gear that rotates with the drive shaft, and the base. The portion has a fixed gear that meshes with the movable gear, and the movable gear has a support side protrusion that protrudes toward the base portion, and the distance from the tip of the support side protrusion to the base portion. Is characterized in that the length is set to maintain the engagement between the movable gear and the fixed gear when the movable gear comes into contact with the base portion.

The second technical means is characterized in that, in the first technical means, the base portion has a base-side protrusion protruding toward the support-side protrusion at a position corresponding to the support-side protrusion. be.

The third technical means is characterized in that, in the first or second technical means, the tooth width of the fixed gear is formed to be larger than the tooth width of the movable gear.

The fourth technical means is characterized by being a television device provided with a stand of any one of the first to the third.

According to the present invention, since the movable gear has a protrusion on the support side and can contact the base portion at a point, smooth movement of the movable gear is maintained even if the connection between the drive shaft and the movable gear is loosened. be able to. In addition, the distance from the tip of the support side protrusion to the base is set to a length that maintains the engagement between the movable gear and the fixed gear even if this distance becomes small, so the drive shaft and the movable gear can be fastened together. Even if it loosens, it is possible to maintain the engagement between the movable gear and the fixed gear and maintain the transmission of power.

It is a perspective view of the display device which installed the stand of one Embodiment of this invention. It is an exploded perspective view of a stand. It is an external perspective view of a support part and a base part. It is an exploded perspective view of a support part and a base part. It is a top view of the dustproof box. It is sectional drawing of the drive unit. It is external perspective view of the 1st and 2nd slide covers. It is a rear view of a support part. It is a figure for demonstrating the operation of a stand.

(Embodiment 1)
FIG. 1 is a perspective view of a display device in which a stand according to an embodiment of the present invention is installed. The stand 1 of the present embodiment has a one-legged structure, and is attached to the lower part of the center (also referred to as a panel center) of the display device (for example, a thin television) 2. In FIG. 1, the display device 2 is viewed from diagonally rear left, and the back surface 3 of the display device 2 is provided with, for example, a plurality of holes 4 for heat dissipation.

The display device 2 can change the orientation of the display screen by rotating in the horizontal direction by the swivel mechanism of the stand 1. The configuration and operation of the stand 1 will be described in detail below.

FIG. 2 is an exploded perspective view of the stand. The stand 1 includes a base portion (also referred to as a stand base) 10 and a support portion (also referred to as a stand support) 20. The base portion 10 and the support portion 20 are mainly made of, for example, resin.
The base portion 10 has a rotation support member 11 at a position corresponding to the panel center, and the front side of the display device, that is, the front of the rotation support member 11 is opened, for example, to form a frame shape and rotate. The rear part of the support member 11 is closed and formed in a plate shape.

The rotation support member 11 is made of, for example, a columnar metal, and can rotate with respect to, for example, the base portion 10. Although the rotation support member 11 shown in the figure is provided upright with respect to the base portion 10, it may be provided with an inclination with respect to the base portion 10. Further, the rotation support member 11 may be a fixed shaft or a member that supports the rotation shaft as long as it can rotate and support the display device.

The support unit 20 is rotatable integrally with the rotation support member 11 and has a drive unit 30 behind the display device 2.
As described above, since the drive unit 30 is provided not in the base portion 10 but in the support portion 20, it is possible to reduce design restrictions on the base portion 10. Further, if the drive unit 30 is provided on the back side of the display device, the drive unit 30 is difficult to see from the front side of the display device, which contributes to the provision of a display device with a stand having a high design including design. ..

The stand of this embodiment has a dustproof structure. FIG. 3 is an external perspective view of the support portion and the base portion, and FIG. 4 is an exploded perspective view of the support portion and the base portion. 5 is a plan view of the dustproof box, and FIG. 6 is a cross-sectional view of the drive unit. Further, FIG. 7 is an external perspective view of the first slide cover and the second slide cover, and FIG. 8 is a rear view of the support portion.

FIG. 3A shows the support portion 20 and the base portion 10 from diagonally left rearward, and the base portion 10 has a dustproof box 13 capable of accommodating the movable gear 38, the fixed gear 12, and the position detection plate 14 shown in FIG. The dustproof box 13 is arranged behind the rotation support member 11 described with reference to FIG. As shown in FIG. 4, the dustproof box 13 is formed in a cup shape, for example, has an upper opening 13c for receiving a movable gear 38 and a fixed gear 12, and a side surface 13b is erected around the upper opening 13c. At the lower end of the side surface 13b, a lower surface 13a through which the leg portion 12a of the fixed gear 12 can be inserted is provided.

As shown in FIG. 5, a rail-shaped base side protrusion 13d is formed on the lower surface 13a at a position corresponding to the support side protrusion of the movable gear 38 described later. Specifically, the base side protrusion 13d projects upward between the left and right side surfaces 13b, and is formed in an arc shape so as to follow the trajectory of the support side protrusion 38b of the movable gear 38.
As shown in FIG. 4, the fixed gear 12 has a trapezoidal portion 12b above the leg portion 12a, and a tooth profile that meshes with the movable gear 38 is formed on the side surface of the trapezoidal portion 12b. A position detection plate 14 is installed on the upper surface of the trapezoidal portion 12b. The position detection plate 14 is provided with white or silver marks at positions corresponding to, for example, a center position, a position 15 ° to the left, and a position 15 ° to the right.

The drive unit 30 has a flat plate-shaped unit base 31. In the unit base 31, for example, the lower surface 47 shown in FIG. 3B is directly connected to the upper surface of the rotation support member 11, and can rotate integrally with the rotation support member 11. On the other hand, the display screen 2 described with reference to FIG. 1 can be fixed to the upper surface 45 of the unit base 31.
As shown in FIGS. 3 (A) and 3 (B) and FIG. 8, the unit base 31 is provided with an opening 46 for a curved slide cover provided so as to penetrate the upper surface 45 and the lower surface 47, and FIG. The upward protrusion 64 of the first slide cover 60 and the upward protrusion 74 of the second slide cover 70 shown in FIG. 7 can be accepted from below, for example.

As shown in FIG. 8, the unit base 31 has a rectangular opening 47a for a photosensor behind the opening 46 for the slide cover. The opening 47a is also formed so as to penetrate the upper surface 45 and the lower surface 47. Further, half punch portions 48 and 49 are provided on both the left and right sides of the opening 47a for the photo sensor. The half punch portion 48 is located on the right side of the opening 47a for the photo sensor as seen in FIG. 8, protrudes downward from the lower surface 47 of the unit base 31, and is located at the end of the opening 63 of the first slide cover 60. Contact is possible. The half punch portion 49 is located on the left side of the opening 47a for the photo sensor as seen in FIG. 8, protrudes downward from the lower surface 47 of the unit base 31, and abuts on the end of the opening 73 of the second slide cover 70. It is possible.

As shown in FIG. 4, the drive shaft 39 is rotatably supported by the electric motor 33. The electric motor 33 is fixed to the unit base 31 with screws, for example. The electric motor 33 is, for example, an AC servomotor whose rotation amount, rotation direction, and rotation speed can be controlled, and the drive shaft 39 can be forward-reversed based on a drive signal from a control unit (not shown).
The drive shaft 39 is formed, for example, in a D-shaped cross section, and the shaft hole 38a of the movable gear 38 shown in FIG. 6 is also formed in a D-shaped cross section. For example, a set screw (not shown) is inserted into the set screw hole 38c. Thereby, the movable gear 38 is fixed to the drive shaft 39.

The movable gear 38 has a support-side protrusion 38b at the lower end thereof, which protrudes toward the base-side protrusion 13d of the dustproof box 13. The support side protrusion 38b is formed in a hemispherical shape (may be a conical shape), for example, and even if the movable gear 38 moves downward from the drive shaft 39, the base from the tip of the support side protrusion 38b (the apex of the hemisphere). The distance to the tip surface of the side protrusion 13d is formed to be long enough to maintain the engagement between the movable gear 38 and the fixed gear 12.
As shown in FIG. 6, the tooth width (length in the vertical direction in the drawing) of the fixed gear 12 is formed to be larger than the tooth width of the movable gear 38, and the movable gear 38 and the fixed gear 12 are engaged with each other. Easy to maintain.

The movable gear 38 is provided at the lower end of the drive shaft 39 and meshes with the fixed gear 12 below the unit base 31. The electric motor 33 is fixed to the upper surface 45 of the unit base 31 by using a spring guide ring 50 having a substantially cylindrical shape.
The spring guide ring 50 has a guide portion 53 that guides the electric motor 33 on the inner surface and guides the tension spring 55 on the outer surface, and a central hole (not shown) through which the drive shaft 39 is inserted in the center of the guide portion 53. Is formed. On the front side of the guide portion 53, a fixing portion 52 for fixing with a screw, for example, is provided on the upper surface 45 of the unit base 31, and on the rear side of the guide portion 53, a pressing portion 54 for pressing the printed circuit board 56 downward is provided. Has been done.

The tension spring 55 is for returning the positions of the first and second slide covers 60 and 70 divided into two, one end of the tension spring 55 is an upward protrusion 64 of the first slide cover 60, and the other end is a second. It is attached to each of the upward protrusions 74 of the slide cover 70.
The printed circuit board 56 has a photo sensor 57 installed in the center of the back surface, is pressed from above by the pressing portion 54 of the spring guide ring 50, and is fixed to the upper surface 45 of the unit base 31.

The photo sensor 57 can irradiate light toward the position detection plate 14 located below, and the photo sensor 57 detects the light reflected by the white and silver marks of the position detection plate 14, thereby rotating the drive unit 30. The moving position can be obtained.
The first slide cover 60 is arranged on the left side in a plan view, and the second slide cover 70 is arranged on the right side in a plan view, and can be interlocked with the rotation of the unit base 31.

As shown in FIG. 7A, the first slide cover 60 has a horizontal surface portion 61 that covers the upper opening 13c of the dustproof box 13 described with reference to FIG. 4, and the upward protrusion 64 is upward from the upper surface of the horizontal surface portion 61. Can project toward and hold the end of the tension spring 55. An opening 62 for a drive shaft for receiving the drive shaft 39 is provided on the front side of the upward protrusion 64 in a curved shape, and an opening 62 for a photo sensor for receiving the photo sensor 57 is provided on the rear side of the upward protrusion 64. The opening 63 is provided in a curved shape.

The first slide cover 60 is arranged below the unit base 31, and the upward protrusion 64 is loosely fitted into the opening 46 for the slide cover from below the unit base 31 so as to project above the unit base 31.
Further, as shown in FIG. 7B, the first slide cover 60 has an L-shaped downward projecting piece 65. The downward projecting piece 65 is formed from the front end to the side end of the horizontal plane portion 61, protrudes downward from the horizontal plane portion 61, and is formed so as to be in contact with the side surface 13b of the dustproof box 13 as shown in FIG. 3 (B). Has been done.

Like the first slide cover 60, the second slide cover 70 also has a horizontal surface portion 71 that covers the upper opening 13c of the dustproof box 13. The upward protrusion 74 projects upward from the upper surface of the horizontal surface portion 71. An opening 72 for a drive shaft for passing the drive shaft 39 is provided on the front side of the upward protrusion 74 in a curved shape, and an opening for a photo sensor for receiving the photo sensor 57 is provided on the rear side of the upward protrusion 74. 73 is provided in a curved shape. The second slide cover 70 is also arranged below the unit base 31, and the upward protrusion 74 is loosely fitted in the opening 46 for the slide cover.

Further, as shown in FIG. 7B, the second slide cover 70 also has an L-shaped downward projecting piece 75 formed from the front end to the side end of the horizontal surface portion 71, and is provided on the side surface 13b of the dustproof box 13. It is possible to contact.

FIG. 9 is a diagram for explaining the operation of the stand. In FIG. 9, the display device, the dustproof box 13, the tension spring 55, and the like are omitted in order to explain the relationship between the unit base 31 and the first and second slide covers 60 and 70.
In a state where the movable gear 38 is located substantially in the center of the fixed gear 12 and the display screen of the display device faces directly in front, the drive shaft 39 starts to rotate, for example, clockwise in a plan view as the electric motor 33 is driven. Then, one end of the unit base 31 (the left end of the unit base 31 seen in FIG. 9A) starts to move (rotate) forward.

After one end of the unit base 31 starts rotating, as shown in FIG. 9B, when the half punch portion 48 of the unit base 31 comes into contact with the end portion of the opening 63 for the photo sensor of the first slide cover 60. , The contact between the downward projecting piece 65 of the first slide cover 60 and the side surface 13b of the dustproof box 13 is released. Then, the first slide cover 60 starts rotating together with the unit base 31 while covering the upper opening 13c of the dustproof box 13 against the urging force of the tension spring 55.

On the other hand, when the first slide cover 60 covers the upper opening 13c of the dustproof box 13 in conjunction with the rotation of the unit base 31, the downward projecting piece 75 of the second slide cover 70 comes into contact with the side surface 13b of the dustproof box 13. As shown in FIG. 9B, even if the first slide cover 60 rotates together with the unit base 31, the second slide cover 70 does not rotate and the upper opening of the dustproof box 13 is opened. Continue to cover 13c.
Then, when the drive shaft 39 rotates, for example, clockwise in a plan view, the left end of the unit base 31 rotates as shown in FIG. 9A, so that the orientation of the display screen is changed to the left.

After that, based on the detection result of the photo sensor 57, when the drive shaft 39 rotates counterclockwise, for example, in a plan view, one end of the unit base 31 (the right end of the unit base 31 as seen in FIG. 9A) moves forward. Start moving (rotating) toward.
After one end of the unit base 31 starts to rotate, when the contact between the half punch portion 48 and the end portion of the opening 63 for the photo sensor is released, the first slide cover 60 is subjected to the urging force of the tension spring 55. While covering the upper opening 13c of the dustproof box 13, the downward projecting piece 65 moves toward the second slide cover 70 until it contacts the side surface 13b of the dustproof box 13.

As described above, since the first and second slide covers 60 and 70 that cover the upper opening 13c of the dustproof box 13 are installed in the unit base 31, it is possible to prevent dust from entering the dustproof box 13. ..
Further, since the movable gear 38 has the support side protrusion 38b and can be in contact with the base side protrusion 13d at a point, the movable gear 38 moves smoothly even if the connection between the drive shaft 39 and the movable gear 38 is loosened. Can be maintained. Further, the distance from the tip of the support side protrusion 38b to the tip of the base side protrusion 13d is set to a length that maintains the meshing between the movable gear 38 and the fixed gear 12 even if this distance becomes small, so that the drive can be driven. Even if the fastening between the shaft 39 and the movable gear 38 is loosened, the engagement between the movable gear 38 and the fixed gear 12 can be maintained, and the transmission of power can be maintained.

Further, if the dustproof box 13 is provided with the base side protrusion 13d, it is sufficient to smooth only the base side protrusion 13d, so that the manufacturing becomes easier as compared with the case where the lower surface 13a of the dustproof box 13 is completely smoothed.
Further, according to the operation shown in FIG. 9, it is divided into a first slide cover 60 that is interlocked with the rotation of the unit base 31 and a second slide cover 70 that is not interlocked with the rotation of the unit base 31. Therefore, the width (length in the left-right direction) of the unit base 31 can be shortened as compared with the case where the first and second slide covers 60 and 70 are integrally formed, and the drive unit 30 can be downsized. Can be done.

(Embodiments 2 and 3)
In FIG. 6, an example of fixing the movable gear 38 to the drive shaft 39 by using a set screw has been described. However, the present invention is not limited to this example. For example, when the drive shaft 39 is press-fitted into the shaft hole 38a and the movable gear 38 is fixed to the drive shaft 39, the set screw may be omitted. Alternatively, the set screw can be omitted by fixing the drive shaft 39 and the shaft hole 38a with an adhesive. When the set screw is omitted, even if the connection between the drive shaft 39 and the movable gear 38 is loosened, the movable gear 38 can be maintained smoothly and the movable gear 38 and the fixed gear 12 can be engaged with each other. Can be maintained and the transmission of power can be maintained.

1 ... stand, 2 ... display device, 3 ... back surface, 4 ... hole, 10 ... base part, 11 ... rotation support member, 12 ... fixed gear, 12a ... leg part, 12b ... trapezoidal part, 13 ... dustproof box, 13a ... bottom surface, 13b ... side surface, 13c ... upper opening, 13d ... base side protrusion, 14 ... position detection plate, 20 ... support unit, 30 ... drive unit, 31 ... unit base, 33 ... electric motor, 38 ... movable gear, 38a ... Shaft hole, 38b ... Support side protrusion, 38c ... Set screw hole, 39 ... Drive shaft, 45 ... Top surface, 46 ... Slide cover opening, 47 ... Bottom surface, 47a ... Photosensor opening, 48, 49 ... Half punch part, 50 ... spring guide ring, 52 ... fixed part, 53 ... guide part, 54 ... pressing part, 55 ... tension spring, 56 ... printed board, 57 ... photo sensor, 60 ... first slide cover, 61, 71 ... Horizontal portion, 62, 72 ... Opening for drive shaft, 63, 73 ... Opening for photo sensor, 64, 74 ... Upward protrusion, 65, 75 ... Downward protrusion, 70 ... Second slide cover.

Claims (6)

A stand used to hold a display device.
The stand includes a base portion and a support portion provided above the base portion, which rotates with respect to the base portion and holds the display device.
Said support portion,
Unit base and
A drive shaft that is rotatably supported by the unit base and extends downward from the unit base toward the base portion to rotate the display screen of the display device.
It has a movable gear that is fixed to the lower end of the drive shaft and rotates with the drive shaft.
Said base portion,
It has a fixed gear that meshes with the movable gear.
A support-side protrusion protruding toward the base portion is provided at the lower end of the movable gear, and the distance from the tip of the support-side protrusion to the base portion is such that the movable gear moves downward from the drive shaft. A stand characterized in that it is set to a length that maintains meshing between the movable gear and the fixed gear even when it is moved. The stand according to claim 1, wherein the base portion has a base-side protrusion protruding toward the support-side protrusion at a position corresponding to the support-side protrusion. The stand according to claim 1 or 2, wherein the tooth width of the fixed gear is formed to be larger than the tooth width of the movable gear. The movable gear has a shaft hole through which the drive shaft is inserted.
The stand according to any one of claims 1 to 3, wherein the distance from the tip of the support side protrusion to the base portion is shorter than the distance at which the drive shaft is inserted in the shaft hole. The stand according to any one of claims 1 to 4, wherein the shape of the support side protrusion is a hemispherical shape or a conical shape. A television device comprising the stand according to any one of claims 1 to 5.

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