JP4793273B2 - LCD television receiver - Google Patents

Description

  The present invention relates to a casing of an electronic device assembled from two cases of an open box shape, in particular, a casing having a box-shaped rib surrounding a speaker arrangement portion, and a liquid crystal television receiver having such a casing. It is about.

  The prior art will be described with reference to the drawings by taking a liquid crystal television receiver as an example. FIG. 4 is a vertical cross-sectional view of a conventional liquid crystal television receiver at a speaker arrangement site, and FIG. As shown in FIGS. 4 and 5, the housing of the liquid crystal television receiver 1 includes a front case 2 having an open back box shape in which a liquid crystal module (not shown) and a main board are disposed, and an open back of the front case 2. It is comprised from the front open box-shaped rear case 3 fixed by fitting in a part. The front opening portion of the rear case 3 is formed thin so that a step is formed on the outer wall surface, and is fitted to the rear opening portion of the front case 2. At this time, each of the plurality of hook portions 2 a formed on the inner wall surface of the rear open portion of the front case 2 is formed of a plurality of long holes formed through the wall surface of the front open portion of the rear case 3. The front case 2 and the rear case 3 are united by engaging with each of the joint holes 3a.

  4 and 5, reference numeral 4 denotes a speaker. The speaker 4 is disposed at the right end inside the housing, and is disposed so that the opening of the diaphragm is opposed to the front surface of the front case 2. The sound emitted from the speaker 4 goes out of the housing from the front surface of the front case 2 and is viewed. For this reason, the housing is devised to efficiently guide the sound emitted from the speaker 4 to the front of the front case 2. That is, as shown in FIGS. 4 and 5, a sealed space is formed inside by close contact between the tips (open portions) of the sound leakage prevention ribs 21 and 31 erected integrally from the front case 2 and the rear case 3. The sound is made to resonate by creating a speaker 4 inside.

  The shape of the sound leakage prevention rib will be described using the rear case as an example. FIG. 6 is a perspective view of a rear case of a conventional liquid crystal television receiver as viewed from the open side. As shown in FIG. 6, the right end of the rear surface of the rear case 3 has two discontinuous slopes 3 c and 3 d whose depth decreases as the right side surface 3 b of the rear case 3 is approached. The sound leakage prevention rib 31 is formed integrally with the rear case 3, and forms a front open box shape with a thin U-shaped enclosure wall protruding forward from the inclined surfaces 3c and 3d. More specifically, the sound leakage prevention rib 31 extends over the slopes 3c and 3d of the rear case 3, and the upper and lower lateral ribs 31a and 31b extend one end horizontally along the inclination direction and reach the inner surface of the right side surface 3b. And a vertical rib 31c that extends vertically along the non-inclined direction of the inclined surface 3c of the rear case 3 and is connected to the other ends of the upper and lower horizontal ribs 31a and 31b.

  The open ends of the sound leakage prevention ribs 31, that is, the front ends of the horizontal ribs 31a and 31b and the vertical ribs 31c are flush with each other in a plane orthogonal to the right side surface 3e of the rear case 3. Therefore, as understood from FIG. 6, the protruding length of the sound leakage prevention rib 31 with respect to the slopes 3c and 3d of the rear case 3 is the extending direction (horizontal direction) of the lateral ribs 31a and 31b. The length of the vertical rib 31c is constant with the maximum protrusion length of the horizontal ribs 31a and 31b over the entire extending direction (vertical direction), while the left end is shortened as it goes to the maximum at the right.

  FIG. 7 is a longitudinal sectional view of a conventional rear case molding die, and FIG. 8 is a sectional view taken along line yy of FIG. When the rear case 3 is molded, as shown in FIGS. 7 and 8, the first mold 101 having the concave portion and the second mold 102 having the convex portion are combined in an uneven fitting manner. At this time, the concave portion and the convex portion are opposed to each other with a predetermined interval, and the cavity portion 103 is formed. The rear case 3 is made by filling and solidifying a molten resin material (hereinafter simply referred to as “material”) in the cavity 103. The material is injected and filled into the cavity 103 from the injection 101 a formed through the first mold 101.

  The second mold 102 is provided with a groove 104 having a corresponding shape for forming the sound leakage prevention rib 31 in the rear case 3. The groove 104 includes lateral grooves 104a and 104b (see FIG. 7) corresponding to the lateral ribs 31a and 31b of the sound leakage prevention rib 31, and a longitudinal groove 104c (see FIG. 8) corresponding to the longitudinal rib 31c of the sound leakage prevention rib 31. And so as to form a U-shape. That is, by filling the U-shaped groove 104 with a material, the sound leakage prevention rib 31 as shown in FIG. 6 is formed.

  However, since the groove depth of the vertical groove 104c is larger than that of the horizontal grooves 104a and 104b, as shown in FIG. 8, the material is filled without reaching the tip of the vertical groove 104c and solidifying. Shortage is likely to occur. For this reason, the completed rear case 3 has a problem that a molding defect occurs with a considerable probability and the material cost increases.

Patent Document 1 describes that four positioning ribs for supporting speaker flange portions from four corners are integrally formed on the outside of a sound conduit rib formed in a cabinet of a television receiver. However, the sound conduit rib does not create a sealed space in the cabinet and accommodates the speaker therein, and therefore functions differently from the sound leakage prevention rib described above. Further, the speaker system described in Patent Document 2 and the speaker box described in Patent Document 3 are not related to a housing of an electronic device in which the speaker is arranged.
JP 2000-307974 A JP-A-1-231498 JP 60-230794 A

The present invention has been made in view of the above problems, to provide a liquid crystal television receiver having a housing that can the be to eliminate the underfilling of sound leakage preventing rib reduce molding defects rate Objective.

In order to achieve the above object, a liquid crystal television receiver according to the present invention is integrally formed on a front case and a rear case made of resin, which are united to form a housing, A sound leakage prevention rib in the form of an open box, and is formed such that a rear opening portion of the sound leakage prevention rib of the front case and a front opening portion of the sound leakage prevention rib of the rear case are in close contact with each other In a liquid crystal television receiver having a housing in which a speaker is disposed in a space, the rear side end portion of the rear case has a slope whose depth decreases as the side surface of the rear case is approached. The sound leakage prevention ribs extend horizontally along the inclined direction of the inclined surface of the slope, and have upper and lower horizontal ribs whose one end reaches the side surface of the rear case, and the non-inclined direction of the inclined surface of the rear case. A longitudinal rib which is connected to the other end of the transverse ribs of the upper and lower vertically extending consists only the longitudinal ribs are formed integrally with the linear rib a plurality of extending in the longitudinal direction.

The housing of the electronic device according to the present invention includes a resin front case and a rear case which are united to form a housing, and a sound projecting integrally with the front case and the rear case to form an open box shape. Leakage prevention ribs, and the speaker is disposed in a sealed space formed by close contact between the back opening portion of the sound leakage prevention rib of the front case and the front opening portion of the sound leakage prevention rib of the rear case. In a case of an electronic device, a plurality of linear ribs extending in the front-rear direction of the sound leakage prevention rib are integrally provided on the outer surface of the sound leakage prevention rib.

The housing of the electronic device, the rear end of the rear case has a slope such as a depth closer to the side surface of the rear case is reduced, the sound leakage preventing rib of the rear case, Other than the upper and lower horizontal ribs that extend horizontally along the inclined direction to the slope and one end of which reaches the side of the rear case, and the vertical ribs that extend vertically along the non-inclined direction of the rear case slope. a longitudinal rib which is connected to the end, consists, or may be provided with the linear rib only in the longitudinal ribs.

According to the liquid crystal television receiver according to the present invention, the mold for molding the rear case has the corresponding horizontal groove and vertical groove for forming the horizontal rib and the vertical rib of the sound leakage prevention rib in the rear case. Since the longitudinal grooves are provided with a plurality of linear grooves extending in the front-rear direction for forming linear ribs, the groove width is enlarged at various points in the vertical direction of the longitudinal grooves. The flow of the material from the base of the longitudinal groove toward the tip is improved as compared with the case where there is no linear groove. For this reason, insufficient filling of the material is solved, and the defect rate of the rear case is reduced. In addition, as a result of filling and solidifying the linear groove, a plurality of linear ribs extending in the front-rear direction are formed on the outer surface of the longitudinal rib of the sound leakage prevention rib of the completed rear case. Thereby, reinforcement of a sound leakage prevention rib can be aimed at.

  Furthermore, in the sound leakage prevention ribs, the linear ribs are formed only on the vertical ribs that are considered to be most likely to be insufficiently filled, so the material cost can be reduced compared to the case where the linear ribs are formed even on the horizontal ribs. Can do.

Further, according to the housing of the electronic device according to the present invention, the mold for molding the rear case has a groove for forming a sound leakage prevention rib in the rear case, and the linear rib is formed in the groove. Since a plurality of linear grooves extending in the front-rear direction for formation are provided, the groove width is enlarged at some places in the groove. Therefore, the material flow from the root of the groove toward the tip is improved as compared with the case where there is no linear groove. For this reason, insufficient filling of the material is solved, and the defect rate of the rear case is reduced. In addition, as a result of filling and solidifying the linear groove, a plurality of linear ribs extending in the front-rear direction are formed on the outer surface of the sound leakage prevention rib of the completed rear case. Thereby, reinforcement of a sound leakage prevention rib can be aimed at.

Further, Oite the housing of the electronic device described above, the sound leakage preventing rib, forming a linear rib only in the vertical ribs that are considered likely to occur on the most underfilling Then, the case of forming the linear ribs to the transverse rib Compared to the above, the material cost can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following description, members common to those of the conventional liquid crystal television receiver shown in FIGS. 4 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1 is a longitudinal sectional view of a rear case molding die constituting a housing of a liquid crystal television receiver according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view taken along line xx of FIG. is there. As shown in FIG. 2, the second mold 102 has a linear groove 105 formed on the left side of the vertical groove 104c so as to extend in the front-rear direction (the vertical direction in the drawing of FIG. 2). Three linear grooves 105 are provided side by side in the vertical direction of the vertical groove 104c (the front-rear direction in FIG. 2). As shown in FIG. 1, the groove depth is shallower than the longitudinal groove 104c, and the lateral grooves 104a and 104b, which are considered to be less likely to be insufficiently filled with material, are not provided with linear grooves, but the transverse grooves 104a and 104b are not provided. Of course, a similar linear groove 105 may be formed.

  By forming this linear groove 105, as shown in FIG. 2, the groove width is enlarged at various points in the vertical direction of the vertical groove 104c, so that the flow of material from the root of the vertical groove 104c to the tip is increased. Compared with the case where the linear groove 105 is not provided, this is improved. For this reason, insufficient filling of the material is eliminated, and the defect rate of the rear case 3 is reduced.

  Further, as a result of filling and solidifying the linear groove 105 as well, as shown in FIG. 3, a plurality of lines extending in the front-rear direction are provided on the outer surface of the vertical rib 31c of the sound leakage prevention rib 31 of the completed rear case 3. The linear rib 31d is formed. Thereby, reinforcement of the sound leakage prevention rib 31 can be aimed at.

  In the sound leakage prevention rib 31, the portion where the linear rib 31 d is formed is sufficient only by the vertical rib 31 c considered to be most likely to be insufficiently filled. Therefore, the material cost can be reduced as compared with the case where the linear rib 31d is formed up to the lateral ribs 31a and 31b.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the case where the sound leakage prevention rib 31 for speaker placement is formed only at the right end portion of the rear case 3 has been described. The prevention rib may be formed, or the rear case 3 may have a similar sound leakage prevention rib formed on both left and right ends.

  In the above embodiment, a liquid crystal television receiver has been described as an example. However, the present invention may be a case of an electronic device that is formed by combining a front case and a rear case that are combined to form a case. It can be applied to anything. In this case, the rear case may be a lid that can be attached to or detached from the front case.

These are the longitudinal cross-sectional views of the rear case shaping metal mold | die which comprises the housing | casing of the liquid crystal television receiver which concerns on one Embodiment of this invention. These are the cross-sectional views in the xx line of FIG. These are the perspective views which looked at the rear case of the liquid crystal television receiver which concerns on the said embodiment from the open side. These are the longitudinal cross-sectional views in the speaker arrangement | positioning site | part of the conventional liquid crystal television receiver. FIG. 5 is a partially omitted horizontal sectional view taken along the one-dot chain line in FIG. 4. These are the perspective views which looked at the rear case of the conventional liquid crystal television receiver from the open side. These are the longitudinal cross-sectional views of the conventional rear case molding die. These are sectional drawings in the yy line of FIG.

Explanation of symbols

1 Liquid crystal television receiver (an example of electronic equipment)
2 Front case 3 Rear case 31 Sound leakage prevention ribs 31a, 31b Horizontal ribs 31c Vertical ribs 31d Linear ribs 101 (for rear case molding) First mold 102 (for rear case molding) Second mold 104 Groove 105 Linear groove

Claims (1)

A resin-made front case and rear case that are combined to form a housing;
A sound leakage prevention rib that protrudes integrally with the front case and the rear case and forms an open box shape,
Have
A liquid crystal television having a casing in which a speaker is disposed in a sealed space formed by closely contacting the back opening portion of the sound leakage prevention rib of the front case and the front opening portion of the sound leakage prevention rib of the rear case. In the receiver,
The rear side end portion of the rear case has an inclined surface whose depth decreases as the side surface of the rear case is approached,
The sound leakage prevention rib of the rear case is vertically extended along the non-inclined direction of the slope of the rear case, and upper and lower lateral ribs that extend horizontally along the inclined direction of the rear case and have one end reaching the side surface of the rear case. A vertical rib extending to and connected to the other ends of the upper and lower horizontal ribs,
A liquid crystal television receiver, wherein a plurality of linear ribs extending in the front-rear direction are integrally formed only on the vertical ribs.

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