JP2008199333A - Porous cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a porous cover which has little change in an inhibition degree to an article function regardless of a change in an arrangement angle. <P>SOLUTION: The porous cover 1 includes an aperture area 3 formed with many through holes 9 with a small diameter and a base area 5 surrounding the periphery of the aperture area 3 as shown in Fig.3(b), and many non-through holes 11 of a similar diameter are formed in the base area 5. Since the aperture area 3 is formed thinner than in the conventional example (Fig.3(a)), sound can easily transmit even when the porous cover 1 is arranged at an inner panel obliquely with respect to an in-vehicle speaker 65. In addition, since a speaker side of a rib 13 between holes is in a tapered shape with a large angle, a visual angle range α2 to the extent that a speaker side of the through holes 9 is closed and becomes invisible is larger than α1 in the conventional example, so that visual beauty brought about by the aggregated state of the through holes 9 can be acquired satisfactorily over a wide range. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a porous cover made of a synthetic resin suitable as a protective cover for an air discharge device such as a speaker cover (net) or an air purifier.

Generally, a mesh or mesh cover is provided as a protective cover on the front surface of the speaker. Examples of this type of cover include those made of fibers as disclosed in Patent Document 1, a resin punching sheet having a large number of through holes formed on the entire surface, a laminate of these, and a punching metal. It has been.
As disclosed in Patent Document 2, the speaker mounted in the vehicle is provided in various places such as a door portion, but since the cover covering the front surface is incorporated in the inner panel in the vehicle, the same as the inner panel. Easy to touch human body and objects. For this reason, a certain degree of rigidity is required, but the above-mentioned resin punching sheet is too thin to obtain the required rigidity.
In this respect, the punching metal is thin and strong enough, and is excellent in visual interior properties (hereinafter also referred to as “visual aesthetics”) brought about by the assembled state of small-diameter through-holes. There is a problem that the material is uncomfortable, and the processing of the shape along the three-dimensional curved surface of the inner panel is cumbersome and expensive.

In view of such a situation, a cover made of synthetic resin dedicated to an in-car speaker with a large thickness has been proposed. As shown in FIG. 2A in a sectional view, the cover 61 includes an opening region 53 in which a large number of through holes 51 are formed, a base region 55 surrounding the opening region 53, and the base It has a frame portion for attachment (not shown) provided on the periphery of the region 55, and is integrally formed in a curved plate shape as a whole.
A specific example of the dimensions will be described. The overall thickness (= thickness of the opening region 53) t≈2 mm, the thickness t1≈1.2 mm on the front side of the inter-hole rib 57, and the thickness t2≈0 of the inter-rib rib 57 on the speaker side. 8 mm, pitch between holes p≈1.63 mm, and hole diameter d≈1 mm.
The speaker side of the inter-hole rib 57 has a taper shape due to die cutting, and the taper degree (hereinafter also referred to as “θ”) is about 4 °. The symbol m indicates the boundary line between the mold core (speaker side) and the cavity.
A large number of non-through holes 59 are formed in the base region 55 from the viewpoint of ensuring strength and visual beauty.

JP-A-7-274274 JP 9-315235 A

In the case of a vehicle-mounted speaker, as shown in FIG. 13, the cover 61 covering the front surface depends on the shape of the inner panel 63, in other words, the interior of the vehicle, and as shown in FIG. In some cases, it may be inclined.
When the cover 61 having the conventional structure described above is inclined, the through-hole 51 in the opening region 53 is deep, so that the sound emitted from the speaker 65 is prevented from moving straight by the inter-hole ribs 57 as shown in FIG. There was a problem that the sound quality deteriorated due to lack of sound or the sound being trapped inside and obstructing directivity.

In addition, when arranged in an inclined manner, the aperture ratio of each through-hole 51 (the visual aperture ratio of the through-hole when viewed from an oblique direction) decreases, and a large number of small diameters in the aperture region as seen in punching metal. There was a problem that the visual aesthetics brought about by the aggregated state of the through holes were lowered. This deterioration in the visual aesthetics due to the cover is an important problem because it leads to a decrease in the aesthetics of the entire vehicle interior.
In this case, it is conceivable to newly manufacture a through-hole 51 having an oblique structure along the direction in which sound is emitted. Further, in the case of the oblique structure, even if the problem of sound can be dealt with, the decrease in visual aesthetics due to the decrease in the aperture ratio is still not solved.

  The present invention provides a porous cover having a small change in the degree of inhibition of the function of the article regardless of the change in the arrangement angle, for example, the degree of inhibition of the sound emitted from the speaker can be greatly reduced even when using the inclined arrangement. Main purpose.

  In order to achieve the above object, the invention according to claim 1 has an opening region in which a large number of through holes are present and a base region surrounding the opening region, and is attached so as to cover one surface side of the article. In the synthetic resin porous cover, the opening region is formed thinner by reducing the article side than the base region.

  According to a second aspect of the present invention, in the porous cover according to the first aspect, the article side in the cross-sectional shape of the opening region has a tapered shape that becomes narrower toward the article side. It is a sex cover.

  According to a third aspect of the present invention, in the porous cover according to the first or second aspect of the present invention, a porous part is integrally provided at the periphery of the base region so as to be opposed to the article. It is a sex cover.

  According to a fourth aspect of the present invention, in the porous cover according to any one of the first to third aspects, the article is a speaker and is attached to the front side thereof.

  The invention according to claim 5 is the porous cover according to any one of claims 1 to 3, wherein the article is an air discharge device having an air outlet, and is attached to the air outlet side. It is a porous cover characterized by this.

According to the present invention, it is possible to reduce the change in the function inhibition of the target article regardless of the degree of inclination, for example, even when the sound is arranged to be inclined with respect to the vehicle-mounted speaker. It is possible to improve the usability while maintaining the manufacturing advantage.
In addition, since the visual aperture ratio gradually decreases with respect to the change in the tilt angle, the visual aesthetics due to the assembly of the through holes can be maintained.

The porous cover which concerns on the 1st Embodiment of this invention is demonstrated according to FIG.1 and FIG.2 (c).
FIG. 1 is a plan view of the porous cover 1. The porous cover 1 according to the present embodiment is formed for an in-vehicle speaker, and is provided in a circular opening region 3, a base region 5 surrounding the opening region 3, and a periphery of the base region 5. And is integrally formed in a plate shape curved with a synthetic resin.
The opening area 3 is an area for protecting the front surface of a vehicle-mounted speaker as an article (not shown) and allowing sound to pass therethrough, and the base area 5 is an area for supporting the opening area 3 and ensuring the overall strength. . The frame portion 7 is a member for attaching to the inner panel and also serves as a sealing material, and contributes to improving the overall strength together with the base region 5. Although not shown, the frame portion 7 is formed with a groove for fitting to the inner panel over the entire circumference.
A large number of small-diameter through holes 9 are formed in the opening region 3, and a large number of non-through holes 11 having the same diameter are formed in the base region 5. FIG. 2C shows a cross section taken along line BB ′ of FIG.

As shown in FIG. 2C, the thickness t3 of the opening region 3 is 1 mm, which is about 1/2 of the conventional example, and the thickness t4 on the front side of the inter-hole rib 13 and the thickness t5 on the speaker side are each about 0.5 mm. Is set to
By reducing the thickness of the opening area 3 by reducing the speaker side, as shown in FIG. 3 (b), the degree of obstruction of the sound progressed by the inter-hole ribs 13 is reduced even if they are inclined, so that the conventional example (FIG. Compared with 3 (a)), the sound passes better.

Further, in the present embodiment, in view of the importance of the visual aesthetic as seen in punching metal, in order to obtain as much visual aesthetics as possible, as shown in FIG. Is set to θ = 30 °.
In this case, as shown in FIG. 3 (b), the viewing angle range α2 until the bottom surface side (speaker side) of the through hole 9 is blocked and cannot be seen is compared with α1 in the conventional example (FIG. 3 (a)). And a good visual aesthetic can be obtained over a wide range.
When the taper degree is increased on the speaker side of the inter-hole rib 13, the taper surface serves as a sound guide surface, so that the function of improving the sound passage in combination with the thinning is enhanced.

FIG. 2D shows a second embodiment, wherein the thickness t6 of the opening region 3 of the porous cover 1 ′ is about 0.8 mm, and the thickness t7 on the speaker side of the inter-hole ribs 15 is about 0.00 mm. It is set to 3 mm. That is, the thickness of the opening region 3 is further reduced as compared with the first embodiment, and the taper degree is θ = 45 ° accordingly. Reference numeral 17 denotes a through hole.
As a result, as shown in FIG. 3 (c), the passage of sound is improved compared to the conventional example (FIG. 3 (a)), and the viewing angle range α3 is equal to or higher than that of the first embodiment. It gets bigger. That is, the visual beauty by the porous shape can be made closer to the punching metal.
FIG. 2B is a comparative example in which the taper degree is θ = 4 ° as in the conventional method in the manufacturing method based on the technical idea of the present invention. The degree of obstructing the progress of sound and the level of visual aesthetics are as follows. It can be regarded as equivalent to the conventional example. Reference numeral 19 denotes a through hole.

Based on FIGS. 4 to 12, it is possible to improve visual aesthetics when the opening region 3 is thin and the taper degree of the inter-hole rib 13 on the speaker side is larger than that of the conventional example. explain.
In FIG. 4, the part A corresponds to the comparative example shown in FIG. 2B, the part B corresponds to the first embodiment, and the part C corresponds to the second embodiment.
The inclination of the test porous cover 67 in which these three portions are formed is changed stepwise while fixing the viewpoint on the viewing side.
FIG. 5 shows an inclination angle of 0 °, that is, a state in plan view. In this case, as shown in FIG. 6, the aperture ratios of the through holes 9, 17, 19 of the respective parts are the same.
Here, the “aperture ratio” is the ratio of the visual opening area of the through hole to the total area of each opening region. In other words, it is the degree of brightness on the bottom side (speaker side) of the through-hole that is visible.

FIG. 7 shows a state where the inclination angle is 25 °. In this case, as shown in FIG. 8, the aperture ratio of the first embodiment B and the second embodiment C is not so low, but in the comparative example A, the aperture ratio is extremely low at about 5%. It is falling. This means that when the depth of the through-hole is large, the visual aesthetic appearance due to the porous shape is rapidly reduced.
FIG. 9 shows a state where the inclination angle is 45 °. In this case, as shown in FIG. 10, in the comparative example A, the aperture ratio is 0%. In the first embodiment B and the second embodiment C, the aperture ratio is as low as about 10%, but the second embodiment C is about 2 times that of the first embodiment B. It has doubled.
FIG. 11 shows a state where the inclination angle is 55 °. In this case, as shown in FIG. 12, the aperture ratio is 0% in both the comparative example A and the first embodiment B, but there is a slight aperture ratio in the second embodiment C. .

From the change in the aperture ratio due to the change in the inclination angle of the test porous cover, the visual aesthetics of the porous shape are improved as the thickness of the opening region 3 is reduced and the taper degree on the speaker side is increased. It is easy to see that
In the above embodiment, two examples of taper degrees of 30 ° and 45 ° have been shown, but the purpose is not limited to this, and optimal angles and dimensions are appropriately set in consideration of the ease of sound passage and visual aesthetics. can do.

In each of the above-described embodiments, examples of use as a protective net for speakers, particularly in-vehicle speakers, have been described. Even if attached to the side, it exhibits special effects such as improving the gas passage performance.
Further, the porous cover of the present invention may be applied to the cover portion of the microphone. In this case, an unprecedented special effect such as improving the sound passage performance of the cover portion is exhibited.
That is, since the depth of the through hole 9 is shallower than that of the conventional example, the contact resistance with the air passing therethrough is reduced, and noise reduction of the air outlet can be realized.
In the configuration in which the taper degree on the article side of the inter-hole rib 13 is increased, the air resistance is further reduced by the tapered surface, which can contribute to further noise reduction.

  Although the embodiments of the present invention have been described in detail above, the specific configuration is not limited to the above-described embodiments, and there are design changes, material changes, and the like without departing from the scope of the present invention. It is included in the invention.

It is a top view of the porous cover which concerns on the 1st Embodiment of this invention. It is a figure which shows sectional drawing in a part of porous cover, (a) is sectional drawing of a prior art example, (b) is sectional drawing of the comparative example based on the manufacturing method of this invention, (c) is 1st Embodiment. (D) is sectional drawing of 2nd Embodiment. It is sectional drawing for demonstrating the degree which obstructs advancing of a sound, (a) is sectional drawing of a prior art example, (b) is sectional drawing of 1st Embodiment, (c) is 2nd Embodiment. It is sectional drawing. It is a top view of the porous cover for a test for investigating that the aperture ratio of an opening area changes with inclination angles. It is a top view of the porous cover for a test in case an inclination angle is 0 degree. It is a partial top view of each opening area | region in case an inclination angle is 0 degree. It is a perspective view of the porous cover for a test in case an inclination angle is 25 degrees. It is a fragmentary perspective view of each opening area | region in case an inclination angle is 25 degrees. It is a porous cover perspective view for a test in case an inclination angle is 45 degrees. It is a fragmentary perspective view of each opening area | region in case an inclination angle is 45 degrees. It is a perspective view of the porous cover for a test in case an inclination angle is 55 degrees. It is a fragmentary perspective view of each opening area | region in case an inclination angle is 55 degrees. It is principal part sectional drawing which shows the diagonal arrangement | positioning structure with respect to a vehicle-mounted speaker. It is sectional drawing for demonstrating the fault of the diagonal arrangement | positioning structure in the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'porous cover 3 Opening area | region 5 Base area | region 7 Frame part 9, 17 Through-hole 65 Speaker

Claims (5)

In a porous cover made of a synthetic resin, which has an open area where a large number of through holes exist, and a base area surrounding the open area, and is attached so as to cover one side of the article,
The porous cover, wherein the opening region is formed thinner by reducing the article side than the base region. The porous cover according to claim 1,
The porous cover, wherein the article side in the cross-sectional shape of the opening region has a tapered shape that becomes narrower toward the article side. The porous cover according to claim 1 or 2,
A porous cover having a frame portion integrally attached to the periphery of the base region so as to face the article. In the porous cover as described in any one of Claims 1-3,
A porous cover, wherein the article is a speaker and is attached to the front side thereof. In the porous cover as described in any one of Claims 1-3,
A porous cover, wherein the article is an air discharge device having an air outlet, and is attached to the air outlet.

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