JP6243149B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly to a display device configured to be ceiling-mountable or attachable to a wall surface or the like.

  Generally, in a display device that can be installed on a ceiling, wall surface, etc., such as a projector, a metal nut is generally inserted into a boss provided in a lower case constituting the housing, and is fixed to the ceiling side. It was fixed with brackets and screws or bolts.

  FIG. 1 shows a projector 101 in a suspended state using a known technique. FIG. 2A is an enlarged cross-sectional view of a fixed portion (region A in FIG. 1) between the ceiling mount 190 and the projector 101. Further, FIG. 2B is a perspective view of a nut 150 used for fixing.

  As shown in the figure, the projector 101 is arranged in the upside down state, and the ceiling hanging bracket 190 is fixed to the cabinet bottom surface 110 with screws 180. In this fixing structure, a nut 150 is incorporated in the cabinet bottom surface 110, and the nut 150 and the ceiling hanger 190 are fixed by screws 180. Specifically, a nut arrangement portion 120 (boss) is formed on the cabinet bottom surface 110. The nut placement portion 120 is cylindrical and has a placement hole 122 inside the cabinet, and a nut 150 is fitted into the placement hole 122. The center of the arrangement hole 122 in the figure is an opening 124 through which the tip 152 of the nut 150 can be inserted. The nut 150 includes a cylindrical tip portion 152 having a smaller outer diameter than the nut main body 151 at the tip of the cylindrical nut main body 151. A stepped portion 153 that is a boundary between the nut main body 151 and the tip end portion 152 comes into contact with the outer edge inner surface portion 126 of the opening 124 of the nut placement portion 120. Therefore, when the screw 180 is screwed into the screw hole 154 of the nut 150 and the ceiling hanging bracket 190 is fixed with the screw 180, the cabinet bottom surface 110 (nut placing portion 120) is moved by the screw 180 and the nut 150 (stepped portion 153). The structure is sandwiched and fixed.

  Various techniques for safety have been proposed as a structure for ceiling suspension. For example, there is a projector proposed for the purpose of preventing falling with a simple configuration (see Patent Document 1). Specifically, the technique disclosed in Patent Document 1 is a structure in which a conventional insert nut is press-fitted into a resin, even when a metal flange is provided between the insert nut and the resin and the boss cracks, A structure for holding the projector at the contact portion between the resin lower case and the flange is proposed. With this structure, it can handle chemical cracks caused by oils and fats.

JP 2007-240982 A

  By the way, in the structure shown in FIG. 1 and FIG. 2, for example, when oil or fat adheres to the insert nut in the manufacturing process, the boss portion of the lower case made of resin may crack due to resin deterioration and the projector may fall. . In addition, the projector may fall due to the same resin deterioration even when used in an extremely oily environment (such as a restaurant) as well as oil and fat adhesion to the insert nut in the manufacturing process. Further, even when a fire or the like is ignited, the projector may fall if the resin burns and melts. In addition, the technique disclosed in Patent Document 1 is insufficient for countermeasures in the harsh environment as described above or in a fire site, and another technique is required.

  This invention is made | formed in view of the above situations, Comprising: It aims at providing the technique which solves the said subject.

The display device according to the present invention includes a resin casing, a metal shield disposed inside the casing, and an insert nut that is inserted into the casing and can be used for fixing to an external predetermined member. The insert nut includes a fixing portion in the shape of a flange attached to the metal shield in a state where the insert nut is inserted into the housing, and the insert nut is screwed to the predetermined external member. Sometimes, the tip end portion of the insert nut is clamped between the casing and the external predetermined member, and the flange is clamped and suspended between the metal shield, the casing and the external predetermined member. In the lowered state, a structure that clamps the casing and the predetermined external member, and the flange connects the metal shield, the casing, and the external predetermined member. Dual suspension system of structural tightening Nde is formed, the fixing portion has a recess which is recessed toward the center to the outer edge of the flange-shaped, with the recess, and the metal shield the insert nut with a screw Fix it .
Further, the insert nut has a nut body, the fixing portion provided at one end of the nut body, and a nut tip convex portion provided at the other end of the nut body, and the insert nut is When the nut is fixed to the external predetermined member, the nut front end stepped portion at the boundary between the nut front end and the nut body may be tightened with the casing and the external predetermined member interposed therebetween.
In addition, the metal shield includes a nut arrangement portion that is formed in a convex shape toward the outside and to which the fixing portion of the insert nut is attached , and the nut arrangement portion is formed when the insert nut is fixed with the screw. You may provide the opening part for insert nut fixation formed in the position which corresponds to a recessed part .
An insulating sheet may be disposed inside the metal shield.
The display device may be a projector.

  According to the present invention, it is possible to provide a technology capable of preventing a projector mounted on a ceiling or on a wall surface from being dropped in a harsh environment where oil or grease adheres to an insert nut, or in a severe environment, and even in a fire. it can.

It is a perspective view which shows the projector with which the ceiling suspension metal fitting based on background art was attached. It is a figure which shows the nut used for fixing structure and fixing of a ceiling-hanging metal fitting and a projector based on background art. It is a perspective view which shows the projector with which the ceiling hanging bracket was attached based on embodiment. It is a perspective view which shows the projector of the state which removed the resin housing | casing based on embodiment. It is a perspective view which shows the metal shield of the state to which the nut with a flange based on embodiment was attached. It is a partial cross section perspective view which shows the fixing structure of a ceiling suspension metal fitting and a projector based on Embodiment. It is a perspective view which shows the nut with a flange used for fixation of a ceiling-hanging metal fitting and a projector based on Embodiment. It is a perspective view which shows the relationship between the nut with a flange and the throttle part for nut fixation based on embodiment. It is a perspective view for demonstrating the attachment structure by the nut with a flange based on embodiment. It is sectional drawing which shows typically the attachment structure by the nut with a flange based on embodiment. 1 is a perspective view of a projector according to an embodiment with a top cover removed. It is a perspective view which shows the state which fixed the power supply unit to the metal shield based on embodiment. It is a perspective view which shows the state which fixed the main board | substrate and the power supply unit to the metal shield based on embodiment. It is a perspective view which shows the state which fixed the main board | substrate, the power supply unit, and the optical mechanism to the metal shield based on embodiment.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

The outline of the present embodiment is as follows.
(1) A metal insert nut (a flanged nut 50 described later) is attached so as to overlap a metal shield (a metal shield 30 described later) inside the housing. Specifically, the insert nut is a flange type, the nut fixing portion of the shield is drawn in a direction opposite to the power supply board side, and the structure can secure a spatial distance from the power supply with an insulating sheet.
(2) The metal shield has a structure in which the metal fitting is fixed to the inlet metal fitting on the power supply board (power supply unit 16 to be described later), which is an incombustible material.
(3) The metal shield has a structure in which the main board, which is an incombustible material, and terminals are screw-fixed.
(4) The main substrate has a structure in which the magnesium portion of the optical mechanism (optical unit), which is an incombustible material, is screw-fixed.

  In the projector having the above features (1) to (4), the insert nut does not fall off from the metal shield in the suspended state even when the housing part is completely removed, and the metal shield is mutually fixed to each incombustible material. Therefore, there is no possibility that main parts constituting the projector fall from the ceiling or the wall surface. Since the above metal shield is a member for unnecessary radiation, it is fixed to the main components of the projector such as the power supply board, main board, and optical mechanism with screws. Even if there is no resin case, the metal, board, etc. The non-combustible materials are combined together to form a structure.

  FIG. 3 is a perspective view showing the projector 1 according to the embodiment, in which the ceiling hanging bracket 90 is attached by screws 80. The projector 1 has an outer surface covered with a resin casing 20 (a lower cover 21, an upper cover 22, and a front cover 23). In the drawing, the projector 1 is shown upside down. A structure for fixing the ceiling mount 90 with a screw 80 is provided in a predetermined area A1 of the lower cover 21 that covers the projector bottom surface 10 on the upper surface in the figure. Further, in this figure, the lens portion of the optical mechanism 17 is exposed facing the lower right side in the figure.

  The screws are fixed to the projector bottom surface 10 of the ceiling hanger 90 with the screws 80, for example, at four locations. Of the four fixing structures, a structure in which the metal shield 30 and the resin casing 20 are commonly fastened at one position is employed. Further, the remaining fixing structure is a fixing structure using only the resin casing 20. Note that, in all the four fixing structures, the characteristic fixing structure in the present embodiment may be employed. Details of these fixing structures will be described later.

  FIG. 4 is a perspective view showing the projector 1 according to the embodiment with the resin casing 20 removed. The illustrated projector 1 also shows a state in which it is inverted upside down. In this figure, the lens portion of the optical mechanism 17 faces the upper left direction. FIG. 5 shows a perspective view of the metal shield 30.

  As shown in the figure, the metal shield 30 is, for example, a member obtained by sheet-plating a steel plate (tinplate) plated with tin, and has a thickness of 0.3 mm. The metal shield 30 includes a shield bottom surface portion 31, a shield back surface portion 32, and a shield mechanical arrangement portion 33.

  As illustrated, the power supply unit 16 is attached to the shield bottom surface portion 31 disposed on the projector bottom surface 10. In addition, a shield back surface portion 32 that is bent and rises from an end portion of the shield bottom surface portion 31 is formed on the rear side of the shield bottom surface portion 31. The main board 15 is attached in the vicinity of the upper end portion of the shield back portion 32. A shield mechanism arrangement portion 33 for fixing the optical mechanism 17 is formed at the front end of the shield bottom surface portion 31.

  In a predetermined region of the shield bottom surface portion 31, a nut fixing throttle portion 34 to which the flanged nut 50 is attached is formed. A fixing structure for the projector 1 and the ceiling hanger 90 is configured by using the nut fixing throttling portion 34 and can be suspended in the direction of the arrow shown in the drawing. Hereinafter, this fixing structure will be described.

  FIG. 6 is a partial cross-sectional perspective view showing a fixing structure of the ceiling hanger 90 and the projector 1. FIG. 7 is a perspective view showing a flanged nut 50 used for fixing the ceiling hanging bracket 90 and the projector 1. The projector 1 is fixed to the fixing opening 92 of the ceiling hanging bracket 90 with a screw 80 using a flanged nut 50.

  As shown in the drawing, the flanged nut 50 includes a nut main body 51, a nut tip convex portion 52, and a flange portion 55, and is formed of metal. The nut body 51 is a cylindrical body, and a cylindrical nut tip convex portion 52 is integrally formed at the tip portion thereof. The outer diameter of the nut main body 51 is larger than the outer diameter of the nut tip convex portion 52, and a nut tip step portion 53 is formed at the boundary portion between the nut main body 51 and the nut tip convex portion 52. Further, a central hole 54 (screw hole) is formed at the tip of the nut tip convex portion 52 in the nut tip convex portion 52 and the nut body 51 in common. A screw thread portion 82 of the screw 80 is screwed into the center hole 54 (screw hole). A flange portion 55 is formed at the end of the nut body 51 opposite to the side where the nut tip convex portion 52 is formed. On the outer edge of the flange portion 55, an anti-rotation recess 56 that is recessed from the circumferential portion toward the center is formed at two opposing positions.

  As described above, the nut arrangement portion 24 is formed on the lower cover 21 of the resin casing 20. The nut arrangement portion 24 has a boss-like shape extending to the inside of the lower cover 21 at a position bulged by a predetermined amount from the main body portion of the lower cover 21. A nut arrangement hole 25 is formed at the center of the boss-shaped nut arrangement portion 24. The nut arrangement hole 25 is substantially the same as the outer diameter of the nut main body 51 of the flanged nut 50, and is formed so that the flanged nut 50 can be fitted from the inside.

  A tip opening 26 that communicates the inside and the outside is formed on the bottom surface of the nut arrangement hole 25 in the outer direction (upward direction in the drawing). The diameter of the tip opening 26 is substantially the same as the outer diameter of the nut tip projection 52, and when the flanged nut 50 is fitted into the nut placement hole 25, the nut tip projection 52 is inserted and arranged.

  On the bottom surface of the nut arrangement hole 25, the outer edge portion of the tip opening 26 is a contact surface 28, and when the flanged nut 50 is fitted in the nut arrangement hole 25, the nut tip step portion 53 comes into contact. ing.

  FIG. 8 is a perspective view of the nut fixing diaphragm 34 as viewed from the inside of the projector 1. The nut fixing squeezing part 34 of the metal shield 30 is formed so as to project outward in the drawing direction (downward in FIG. 8 and upward in the opposite direction to the power supply unit 16 in FIG. 4) in a trapezoidal section. Has been.

  A nut insertion opening 35 is formed in the nut fixing throttle portion 34. The diameter of the nut insertion opening 35 is substantially the same as the outer diameter of the nut arrangement hole 25, and the nut insertion opening 35 of the metal shield 30 with the resin housing 20 (lower cover 21) attached in the projector 1. And the nut arrangement hole 25 of the resin casing 20 coincide with each other. The nut main body 51 is inserted into the nut insertion opening 35, and the flange portion 55 abuts and locks in the vicinity of the nut insertion opening 35.

  When the flanged nut 50 is fitted, the flange portion 55 comes into contact with the inner tip portion (boss-shaped tip portion) of the nut arrangement hole 25, and insertion is restricted. Therefore, in a state in which the flanged nut 50 is completely inserted and fitted into the nut arrangement hole 25, the nut tip step portion 53 contacts the contact surface 28, and the flange portion 55 is the outer edge portion of the nut insertion opening 35. Abut.

  A pair of nut fixing openings 36 are formed on both sides of the nut insertion opening 35 so as to sandwich the nut insertion opening 35. Further, in a state where the insertion of the flanged nut 50 is fixed by the flange portion 55, the rotation prevention recessed portion 56 and the nut fixing opening 36 coincide with each other. As will be described next, the rotation prevention recess 56 prevents the rotation of the flanged nut 50 from being positioned.

  FIG. 9 is a view for explaining the mounting structure of the flanged nut 50. FIG. 9A shows a characteristic structure in the present embodiment, and corresponds to the structure of FIG. FIG. 9B shows a structure in which the flanged nut 50 is attached to the resin casing 20 without using the nut fixing throttle 34.

  As shown in FIG. 9A, positioning pins 29 a are formed inside the lower cover 21 of the resin housing 20. In a state where the resin casing 20 covers the projector 1, the pin 29 a is inserted through the nut fixing opening 36. The top of the pin 29 a protrudes from the nut fixing opening 36 and is disposed in the concave shape portion in the rotation prevention recess 56. A nut fixing boss 29b is formed on the opposite side of the pin 29a across the flanged nut 50 (nut insertion opening 35). Although not shown in FIG. 9A, it has the same structure as the nut fixing boss 29b of FIG. 9B. The screw hole 29c formed in the nut fixing boss 29b coincides with the other nut fixing opening 36, and the flange portion 55 (the flanged nut 50) is fixed by the countersunk screw 85 in a state where both of them coincide. . That is, the screw 85 functions to prevent the nut 50 with a flange from rotating and to prevent the nut 50 from falling off.

  FIG. 10 is a cross-sectional view schematically showing a mounting structure with a flanged nut 50. As illustrated, an insulating sheet 70 is disposed between the metal shield 30 and the power supply unit 16. In other words, since the nut fixing throttle portion 34 has a shape protruding in the direction opposite to the power supply unit 16 (the outside direction of the projector 1), it is easy to secure a space for disposing the insulating sheet 70. As described above, since the outer diameter of the flange portion 55 is larger than the diameter of the nut insertion opening 35, the flanged nut 50 does not penetrate the nut insertion opening 35 from the inside and come out to the outside.

  FIG. 11 is a perspective view of the projector 1 with the upper cover 22 removed. FIG. 12 is a perspective view showing a state in which the power supply unit 16 is fixed to the metal shield 30. FIG. 13 is a perspective view showing a state in which the main board 15 and the power supply unit 16 are fixed to the metal shield 30. FIG. 14 is a perspective view showing a state in which the main board 15, the power supply unit 16, and the optical mechanism 17 are fixed to the metal shield 30.

  For example, as shown in FIGS. 11, 12, and 14, the power supply unit 16 is screw-fixed to the metal shield 30 in an area X <b> 1 (inlet metal part) near the boundary between the shield bottom surface portion 31 and the shield back surface portion 32. As shown mainly in FIG. 13, the main board 15 is screw-fixed to the metal shield 30 in the vicinity of the region Y1 where the terminal opening is provided in the shield back surface portion 32. Further, as shown mainly in FIGS. 11 and 14, the optical mechanism 17 is screw-fixed to the metal shield 30 at a predetermined region Z1 at the tip of the shield mechanism arrangement portion 33 in a portion made of a magnesium alloy or the like. The

  Therefore, main components of the projector 1 are fixed to the metal shield 30. As a result, in a state where the projector 1 is suspended from the ceiling or the like by the ceiling bracket 90, the ceiling bracket 90 is fixed to the metal shield 30 and the resin housing 20 by the flanged nut 50 and the screw 80 in a normal state. Will be. Even if the resin casing 20 is burnt down by a fire or the fixing ability of the resin casing 20 is reduced due to the occurrence of a crack caused by a severe use environment, the metal shield 30 can be used without the resin casing 20 alone. Main components such as the main board 15 can be held. That is, the substantial weight of the projector 1 can be prevented from falling.

  Further, as shown in FIG. 9, since the flange portion 55 is structured so as not to come off, the metal shield 30 can be thinned. When the weight of the projector 1 is about 5 kg, as described above, Even if the thickness is about 0.3 mm, the desired performance can be sufficiently realized. In addition, when securing the ceiling suspension strength with a structure in which a nut corresponding to the flanged nut 50 is caulked directly to a sheet metal (a tin plate corresponding to the metal shield 30), a thickness of about 1.0 to 1.6 mm is required. there were. Thus, the thickness and weight can be greatly reduced.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations of the respective components and the like, and such modifications are within the scope of the present invention. For example, the flange portion 55 is used for fixing to the metal shield 30, but the present invention is not limited to this, and a structure having the same function, for example, a nut fixing like a structure protruding outward from the side surface of the nut body 51 is used. A structure that functions as a fixed portion by engaging with the outer edge of the nut insertion opening 35 of the throttle portion 34 may be used. In this embodiment, the structure in which the projector 1 is fixed to the ceiling has been described. However, the structure is not limited to this, and a predetermined display device (for example, a liquid crystal display device or the like) other than the projector 1 is used. The present invention can also be applied to a structure for fixing the device to a wall surface or the like.

1 Projector (display device)
DESCRIPTION OF SYMBOLS 10 Projector bottom surface 15 Main board 16 Power supply unit 17 Optical mechanism 20 Resin housing | casing 21 Lower cover 22 Upper cover 23 Front cover 24 Nut arrangement part 25 Nut arrangement hole 26 Tip opening 28 Contact surface 29a Pin 29b Nut fixing boss 29c Screw hole 30 Metal shield 31 Shield bottom part 32 Shield back part 33 Shield mechanical arrangement part 34 Nut fixing throttle 35 Nut insertion opening 36 Nut fixing opening 50 Nut with flange (insert nut)
51 Nut body 52 Nut tip projection (nut tip)
53 Nut tip step (Nut tip)
54 Center hole 55 Flange (fixed part)
56 Anti-rotation recess 70 Insulation sheet 80 Screw 82 Screw thread 85 Screw 90 Ceiling mount 92 Fixing opening

Claims (5)

A resin casing;
A metal shield disposed inside the housing;
An insert nut inserted into the housing and configured to be usable for fixing to an external predetermined member;
Have
The insert nut includes a fixing portion in the shape of a flange attached to the metal shield in a state inserted in the housing.
When the insert nut is screwed to the external predetermined member, the tip end portion of the insert nut is clamped between the casing and the external predetermined member, and the flange is connected to the metal shield and the casing. Tighten the body and the external predetermined member,
Two suspensions of a structure in which the casing and the external predetermined member are clamped in a suspended state, and a structure in which the flange is clamped by sandwiching the metal shield, the casing and the external predetermined member A system is formed ,
The fixing portion has a concave portion that is recessed toward the center side on the outer edge portion of the flange shape,
The display device , wherein the insert nut is fixed to the metal shield with a screw in the recess . The insert nut has a nut main body, the fixing portion provided at one end of the nut main body, and a nut tip convex portion provided at the other end of the nut main body,
When the insert nut is screwed to the external predetermined member, the nut front end step portion at the boundary between the nut front end convex portion and the nut main body is clamped with the casing and the external predetermined member interposed therebetween. The display device according to claim 1. The metal shield includes a nut arrangement portion that is formed to protrude outward and to which the fixing portion of the insert nut is attached .
The display device according to claim 1 , wherein the nut placement portion includes an insert nut fixing opening formed at a position coinciding with the recess when the insert nut is fixed with the screw. .   The display device according to claim 1, wherein an insulating sheet is disposed inside the metal shield.   The display device according to claim 1, wherein the display device is a projector.

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