JP2007017509A - Mounting structure for display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure for a display device that is improved in heat dissipation and cooling effects, in a closed type controller. <P>SOLUTION: A casing 2 of a control device 1 is formed as a closed structure, and the casing 2 houses electronic and electrical component circuits 4 of a controller including the drive control circuit of a display device. A display panel 3 of the display device is mounted by a mounting member 5 on the front face of the casing 2, while keeping a predetermined gap 7. Since the predetermined gap 7 is provided between the display panel 3 and the casing 2, this part also contributes to heat dissipation, and heat dissipation can be carried out by the entire casing 2. Also the display panel can perform heat dissipation on the front face and the back faces, which increases the cooling effect. Thus, the controller can be made small in size. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mounting structure of a display device in a control device used in a bad environment such as a numerical control device.

A control device that controls various devices and machines, and in a control device having a display device, heat is generated from a semiconductor or display device disposed on a printed board or the like, and various measures are taken to dissipate this heat. It has been taken.
As a countermeasure, it is common to exhaust heat generated inside the equipment by introducing air from outside into the equipment such as a control device and exhausting it outside. For example, a first heat conductor having a coolant passage filled with a coolant is disposed between the back side of the liquid crystal display panel and the back surface of a printed board on which circuit components that generate heat are mounted. In the electronic device in which the second heat conductor having the refrigerant passage is disposed, air is introduced into the interior from the intake port, and the introduced air is discharged from the exhaust port. A cooling system is known (see Patent Document 1).

  In addition, in the wall-embedded liquid crystal panel, the front cover is mounted in a state of protruding in front of the mounting surface, and a plurality of ventilation openings for releasing heat are provided on the peripheral wall of the projection, and the ventilation openings are provided through the ventilation openings. In addition, there is also known an apparatus in which heat generated from a mounting component of a printed circuit board disposed inside the panel unit is radiated by introducing external air into the panel unit and exhausting the outside (see Patent Document 2). ).

JP 2004-233791 A JP 2003-75858 A

  As described above, in order to prevent the internal electronics, electrical components and elements from being heated and damaged or broken due to heat generated from semiconductors or display panels disposed inside the device, A general method is to take in external air, circulate the inside of the device, cool the inside of the device, and discharge the warmed air to the outside.

  On the other hand, in a control device such as a numerical control device that controls a machine tool, cutting powder flies around the control device, and cutting oil flies in a mist form. Since cutting oil contains chemical substances that affect electronic and electrical components, the control device used in such an environment takes external air into the interior and cools internal components and elements. It is not possible to make a complete sealed structure.

  As a heat dissipation method for electronic equipment that assumes this completely sealed structure, a method of cooling by dissipating heat from the surface of the housing of the device is used, and in order to increase heat dissipation efficiency, the surface area of the housing is increased. However, there is a problem in that even if the internal structure of the device is downsized, the housing becomes large and cannot be downsized.

In particular, in a control device having a display device, the display panel itself of the display device generates heat, and the display panel is disposed on the housing of the control device. The heat dissipation efficiency is worsened.
3A and 3B are diagrams showing an example of a completely sealed control device provided with a conventional display device. FIG. 3A is a perspective view, and FIG. 3B is a central portion in FIG. It is the cross-sectional top view cut | disconnected and seen from the top.
The housing 2 of the control device 1 is configured in a sealed structure, and a display panel 3 is attached to the outside of the front surface by an attachment member 5. Inside the housing 2, there is an electronic / electrical component circuit 4 constituted by a display panel control unit for driving and controlling the display panel and other printed circuit boards on which electronic, electrical components and elements of the control device 1 are mounted. The electronic / electrical component circuit 4 and the display panel 3 are connected by a connection cable 6 via an attachment member 5.

  In order to reduce the size of the control device 1, it is desirable to arrange the display panel 3 and a control circuit for driving and controlling the display panel in the vicinity of the display panel 3, and also a cable connecting the display panel 3 and the drive control circuit. Since it is desirable that the length is short, the electronic / electrical component circuit 4 including a control circuit for driving and controlling the display panel 3 is usually disposed at the rear position of the display panel 3.

Among the electronic / electrical components mounted on the printed board of the electronic / electrical component circuit 4, there are components that generate heat, such as semiconductor elements. The heat released from these heat generating components is only radiated from the surface of the housing 2 and cooled because the housing 2 is a sealed type.
On the other hand, the display panel 3 also generates heat. For example, when a liquid crystal display panel is used as the display panel 3, the backlight is disposed on the back surface of the liquid crystal display panel. Therefore, heat generated from the backlight is conducted through the casing 2 of the control device 1, and the casing 2 The heat dissipation effect from the housing 2 is reduced.
SUMMARY OF THE INVENTION An object of the present invention is to provide a display device mounting structure having an improved heat dissipation and cooling effect in a sealed control device having a display device.

  The present invention relates to a mounting structure of a display device provided in a control device, and the control device houses an electronic / electrical component circuit of the control device including a drive control circuit of the display device therein and has a sealed structure. The display panel of the display device is attached at a predetermined interval from the outer surface of the housing. Furthermore, the heat radiation effect is improved by disposing heat radiation fins in the space of the predetermined interval.

  Even if the housing of the control device is hermetically sealed and the display panel is attached to the housing, the display panel is attached with a space of a predetermined gap from the housing. Since the display panel can also dissipate heat from the front and back surfaces, the heat dissipation and cooling effects are improved. Therefore, the control device can be downsized.

FIG. 1 is a schematic diagram of a first embodiment of the present invention. FIG. 1A is a perspective view, and FIG. 1B is a cross-sectional plan view cut from the center of FIG. 1A and viewed from above. In addition, the same code | symbol is attached | subjected to the corresponding member in the prior art example shown in FIG.
The housing 2 of the control device 1 is configured in a sealed structure, and the display panel 3 is attached to the outside front by an attachment member 5. The attachment member 5 is formed in a gate shape, and the leg portion 5 a is fixed to the surface of the housing 2. Further, a reinforcing plate 5b for attaching the display panel 3 is provided between the two leg portions 5a and 5a. When the attachment member 5 is attached to the housing 2, there is a gap between the surface of the housing 2 and the reinforcing plate 5b. The reinforcing plate 5b is arranged so that 7 is formed. A display panel 3 such as a liquid crystal display panel is disposed on (outside) the reinforcing plate 5b. Since the gap 7 is formed so as to penetrate in the vertical direction, air passes through the gap 7 and cools the front surface of the housing 2 and the back surface of the display panel 3.

  Inside the housing 2, there is provided an electronic / electrical component circuit 4 constituted by a display panel control unit for driving and controlling the display panel 3 and electronic and electrical components of other control devices 1, a printed board mounted with elements, and the like. The electronic / electrical component circuit 4 and the display panel 3 are connected by a connection cable 6 via an attachment member 5.

  Heat generated from a heat generating component such as a semiconductor mounted on a printed board or the like of the electronic / electrical component circuit 4 is conducted to the housing 2 of the control device 1 and is radiated to the outside from the surface of the housing 2. In particular, in this embodiment, the display panel 3 of the display device provided on the outer surface of the housing 2 of the control device 1 is disposed with a gap 7 from the surface of the housing 2, so 2 is radiated from the entire outer surface.

The display panel 3 also generates heat, but the display panel 3 is not attached in close contact with the surface of the housing 2 of the control device 1 and is attached with a gap 7. The heat generated from the display panel 3 is radiated from the front surface and further radiated from the back surface of the display panel 3, and the heat is released to the outside by the air passing through the gap 7. As a result, the heat dissipation effect is improved as a whole of the control device 1, and the control device 1 is cooled.
Note that the gap 7 formed between the display panel 3 and the surface of the casing is set to a size that provides a heat dissipation and cooling effect.

  As described above, in the present embodiment, the gap 7 is provided on the outer surface of the housing 2 of the display panel 3 and the control device 1, and the entire outer surface of the housing 2 of the control device 1 forms a heat radiating surface. Therefore, the heat dissipation effect is improved, the housing 2 can be downsized, and the control device can be downsized. Further, the display panel 3 also has a cooling effect on the display panel 3 because the front and back surfaces thereof are heat dissipation surfaces.

FIG. 2 is a central sectional plan view of the control device according to the second embodiment of the present invention.
The difference between the second embodiment and the first embodiment is that a heat radiation fin 8 is provided in the gap 7 between the display panel 3 and the housing 2 in order to improve the heat radiation effect. 2 shows an example in which the heat radiating fins 8 are provided on the housing 2 side. However, the heat radiating fins 8 may be provided on the reinforcing plate 5b side to which the display panel 3 is attached. Both may be provided.

1 is a schematic diagram of a first embodiment of the present invention. It is a center section top view of a control device in a 2nd embodiment of the present invention. It is a schematic diagram of the control apparatus which has the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Housing | casing 3 Display panel 4 Electronic / electrical component circuit 5 Mounting member 5a Leg part 5b Reinforcement board 6 Cable 7 Gap 8 Radiation fin

Claims (2)

A display device mounting structure provided in the control device,
The control device houses the electronic / electrical component circuit of the control device including the drive control circuit of the display device inside, and is formed of a sealed housing.
The display device mounting structure is characterized in that the display panel of the display device is mounted at a predetermined interval from the outer surface of the housing. The display device mounting structure according to claim 1, wherein heat radiation fins are disposed in the space of the predetermined interval.

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