JP2005079236A - Substrate-fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely fix a substrate against a load applied from the outside, without lowering the proper workability which is the advantage of a fixing means which carries out fixing by an elastic-deformable engagement claw. <P>SOLUTION: A substrate fixing device comprises a case main body 10 made of synthetic resin which is covered by a case cover 20. On the inner face of the case body 10, the elastic-deformable engagement claw 13 having a hook 131 at the end is integrally formed with the case body 10 in a protruding condition. The substrate P which is an object to be fixed is fixed inside the case body 10 by means of the engagement claw 13. On the internal wall of the case cover 20, a claw-pressing means (presser rib) 23 is formed which is located in face to face with a rear face of the engagement claw 13, when the case cover 20 is attached to the case body 10, and suppresses the amount of elastic deformation of the engagement claw 13 to be within such a range that the substrate P does not be slip out. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a substrate fixing device, and more particularly to a substrate fixing device that fixes a substrate such as a liquid crystal panel or a circuit substrate to a case member.

  The substrate fixing device will be described by taking the field of liquid crystal display elements as an example. Methods for fixing the liquid crystal panel to a case member such as an exterior case include screwing (for example, see Patent Document 1) and adhesive (for example, Patent Document). 2), locking claws (see, for example, Patent Document 3) and the like are generally employed.

  Among them, screw fixing is the most reliable, but the number of parts increases, the tightening work takes time, drilling to the board is necessary, screw receiving boss needs to be formed on the case, and fixing There is a problem such as a large space required.

  When using adhesives (including double-sided adhesive tape), it is less time-consuming than screw fixing, but it is difficult to be reliable because it is easily affected by the environment such as temperature and humidity, and during maintenance. There is a problem that it is difficult to remove.

  The locking claw includes a twisted claw made of a metal piece and an elastic locking claw made of synthetic resin. Both of them have good workability and maintainability, but metal twisting claws are particularly prone to metal fatigue due to repeated twisting, so elastic locking claws made of synthetic resin are preferable as far as design circumstances permit It can be said. An example thereof will be described with reference to an exploded perspective view of FIG. 3 and a partially enlarged sectional view of FIG.

  FIG. 3 shows an example in which the liquid crystal panel P, which is a fixed substrate, is fixed in the case main body 10 on which the case cover 20 is covered. The case body 10 is formed of a synthetic resin material, and a support frame 12 having a side frame with a predetermined thickness is integrally provided on the inner surface 11 of the case body 10. A display window 21 is formed on the case cover 20.

  The support frame 12 is provided to support the liquid crystal panel P in a floating state from the case body 10, and a backlight (not shown) of the liquid crystal panel P is disposed in a space 121 surrounded by the support frame 12. It is like that.

  In addition, a pair of elastically deformable locking claws 13, 13 for fixing the liquid crystal panel P are provided on the outside of the support frame 12 so as to face each other. Each latching claw 13 is integral with the case body 10 and includes a substantially inverted L-shaped flange 131 at the tip (head) thereof as shown in FIG.

  The height of each locking claw 13 is set so that the distance between the collar 131 and the support frame 12 is substantially equal to the thickness of the liquid crystal panel P in order to prevent the vertical shaking of the liquid crystal panel P. ing. Further, a tapered surface 132 is formed on the upper surface of the collar portion 131 so that the liquid crystal panel P can be easily inserted between the locking claws 13.

  According to this configuration, when the liquid crystal panel P is forcibly pushed from above the tapered surface 132 of the collar 131, the locking claws 13 and 13 are once spread outward, and when the liquid crystal panel P gets over the collar 131. Since the locking claws 13 return to their original positions, the liquid crystal panel P can be fixed by a so-called one-touch operation. Further, when it is necessary to remove the liquid crystal panel P for maintenance, the locking claws 13, 13 may be bent outward with a finger or the like.

  By the way, when the liquid crystal panel P is for in-vehicle use, for example, vibration and impact (load) are applied from all directions. According to the above-mentioned locking claws 13, 13 is strong against the load applied from the vertical direction in FIG. 4, but since the locking claws 13, 13 can be elastically deformed, against the load applied from the horizontal direction. weak. That is, when an excessive load is applied from the horizontal direction, the locking claw 13 may bend as shown by the dotted line in FIG. 4, and the liquid crystal panel P6 may be detached from the locking claw 13.

  In order to solve this problem, as an example, as shown in FIG. 5, there is a method of raising the strength of the locking claws 13 by raising the reinforcing ribs 14 on the back surface 134 side (anti-supporting frame side) of the locking claws 13. However, if it does in this way, since the latching nail | claw 13 itself will become hard, another problem that the insertion property of liquid crystal panel P will be impaired will arise. Such a problem similarly occurs even when the object to be fixed is, for example, a circuit board.

JP 2003-140117 A JP 2003-121815 A JP 2001-183633 A

  Therefore, the problem to be solved by the present invention is that the substrate can be securely fixed against a load applied from the outside without impairing the good workability which is an advantage of the fixing means by the elastically deformable locking claw. There is in doing so.

  In order to solve the above-mentioned problems, the present invention comprises a case body made of a synthetic resin on which a case cover is covered, and an elastically deformable locking claw having a flange at the tip is erected on the inner surface of the case body. In the substrate fixing device for fixing the substrate, which is an object to be fixed, in the case body by the locking claws, the engagement wall is provided on the inner peripheral wall of the case cover when the case cover is attached to the case body. Claw pressing means is provided to face the back surface of the pawl and press the amount of elastic deformation of the locking pawl within a range where the substrate cannot be removed.

  In the present invention, the claw pressing means includes a mode in which the thickness of the entire inner peripheral wall of the case cover facing the locking claw is increased, but the amount of resin used in the case cover is reduced and the molding is easy. From this point of view, it is preferable that the claw pressing means comprises a pressing rib formed on the inner peripheral wall of the case cover.

  Moreover, even if it is the said holding rib, it does not necessarily need to form over the whole height range of the said latching claw, and if the said claw is provided in the position facing at least the said collar part, the said subject can be solved.

  According to the present invention, in a state where the case cover is removed from the case main body, the locking claw can be elastically deformed as much as possible, so that the substrate can be fixed by a one-touch operation as in the conventional example. Further, even during maintenance, the fixing of the substrate can be released by expanding the locking claws as necessary. On the other hand, by covering the case body with the case cover after fixing the board, the amount of elastic deformation of the locking claw is limited to a range where the board cannot be removed by the claw pressing means on the case cover side. Even if is added, the substrate does not come off the locking claw.

  Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an enlarged cross-sectional view showing a main part of the substrate fixing apparatus of the present invention, and FIG. 2 is a perspective view showing a pressing rib on the case cover side which is the main part of the present invention. In the description of this embodiment, the same reference numerals are used for components that can be regarded as the same as or the same as those in the conventional example described with reference to FIGS.

  Also in this embodiment, the object to be fixed to the case member is the liquid crystal panel P, and the case member is the case body 10 having the detachable case cover 20. The case body 10 is formed of a synthetic resin material, and a support frame 12 having a side frame with a predetermined thickness is integrally provided on the inner surface 11 of the case body 10.

  The support frame 12 is for securing a space for arranging a backlight (not shown) on the back surface of the liquid crystal panel P. In the present invention, the support frame 12 is an optional component. That is, the liquid crystal panel P may be disposed on the inner surface 11 of the case body 10 while being supported by a backlight (not shown), or may be disposed directly in some cases.

  A locking claw 13 is erected on the outside of the support frame 12. Although only one locking claw 13 is shown in FIG. 1, in a normal design, at least a pair is opposed so as to grip two opposite sides of the liquid crystal panel P as shown in FIG. Arranged. An embodiment in which one side of the liquid crystal panel P is supported by a predetermined fixing means that does not elastically deform, and the other side facing the liquid crystal panel P is fixed by the locking claw 13 is also included in the present invention.

  The locking claw 13 is integral with the case body 10 and includes a substantially inverted L-shaped flange 131 at the tip (head) thereof. In this example as well, as in the conventional example described above, the height of each locking claw 13 is such that the gap between the collar 131 and the support frame 12 is in order to prevent the liquid crystal panel P from rattling in the vertical direction. It is set to be approximately equal to the thickness of the liquid crystal panel P. Further, it is preferable that a tapered surface 132 is formed on the upper surface of the collar portion 131 so that the liquid crystal panel P can be easily inserted between the locking claws 13 and 13.

  According to this configuration, when the liquid crystal panel P is forcibly pushed from above the tapered surface 132 of the collar 131, the locking claws 13 and 13 are once spread outward, and when the liquid crystal panel P gets over the collar 131. Since the locking claws 13 return to their original positions, the liquid crystal panel P can be fixed by a so-called one-touch operation.

  After fixing the liquid crystal panel P with the locking claws 13 in this manner, the case cover 20 is put on the case body 10, but the liquid crystal panel P is locked by the locking claws 13 due to a load (vibration or impact) applied from the outside. In order to prevent it from coming off, the present invention is provided with a claw pressing means on the case cover 20 side.

  This claw pressing means has an action of limiting the amount of elastic deformation of the locking claw 13 to a range in which the liquid crystal panel P cannot be removed. In this example, the claw holding means is integrated with the inner peripheral wall 22 of the case cover 20 as shown in FIG. The presser ribs 23 formed in are used as claw pressing means. As shown in FIG. 1, the pressing rib 23 is disposed at a position where the protruding surface 231 faces the back surface of the locking claw 13 with a predetermined interval when the case cover 20 is put on the case body 10. .

  In this case, the distance between the presser rib 23 and the locking claw 13 may be set as appropriate depending on the height of the locking claw 13 and the predicted elastic deformation amount when a load is applied. Further, the protruding surface 231 of the presser rib 23 may be formed in a size that can contact at least the side of the flange 131 of the locking claw 13 when the locking claw 13 is elastically deformed.

  Although the presser rib 23 is partially provided on the inner peripheral wall 22 of the case cover 20 corresponding to the locking claw 13, as another example, the entire inner peripheral wall 22 of the case cover 20 provided with the presser rib 23 is provided. A mode in which the thickness is increased by the protruding amount of the presser rib 23 is also included in the present invention.

  According to the present invention, the presser rib (claw pressing means) 23 effectively acts on the locking claw 13 only when the case cover 20 is put on the case main body 10. Therefore, at the time of assembling to fix the liquid crystal panel P to the case body 10 or performing maintenance by removing the case cover 20, good workability, which is an advantage of the fixing means by the elastically deformable locking claws 13, is impaired. Absent.

  In addition, in the said embodiment, although the presser rib 23 is formed in the substantially thin plate shape, the presser rib 23 should just be the thing which can hold down the collar part 131 side of the latching claw 13 as a minimum, The shape and size are not particularly limited. For example, it may be a boss-like protrusion.

  The present invention is not limited to the case where the liquid crystal panel is fixed to the elastically deformable locking claws provided in the case body as in the above embodiment, but the case body has a case cover. For example, the present invention can be widely applied when the object to be fixed is a circuit board or the like.

The expanded sectional view which shows typically the principal part of the board | substrate fixing apparatus of this invention. The perspective view which shows the pressing rib by the side of the case cover which is the principal part of this invention. The disassembled perspective view which shows the board | substrate fixing device which concerns on a 1st prior art example. The partial expanded sectional view of the said 1st prior art example. The partial expanded sectional view which shows a 2nd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case main body 12 Support frame 13 Locking claw 131 Gutter part 132 Tapered surface 20 Case cover 21 Display window 22 Inner peripheral wall 23 Pressing rib

Claims (3)

It has a case body made of synthetic resin that covers the case cover, and an elastically deformable latching claw having a flange at the tip is erected on the inner surface of the case body. In the substrate fixing device for fixing a certain substrate in the case body,
On the inner peripheral wall of the case cover, when the case cover is attached to the case body, it is arranged to face the back surface of the locking claw, and the elastic deformation amount of the locking claw is within a range where the substrate cannot be removed. A substrate fixing device comprising a claw pressing means for pressing the substrate.   The board fixing device according to claim 1, wherein the claw pressing means includes a pressing rib formed on an inner peripheral wall of the case cover.   The substrate fixing device according to claim 1, wherein the claw pressing unit is provided at a position facing at least the flange portion of the locking claw.

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