JP2008295595A - Headrest and manufacturing method thereof - Google Patents

Abstract

Provided is a headrest that can be easily manufactured by reducing the number of parts, and that a speaker can be easily inserted when foaming a cushion pad.
A headrest core is attached to an upper portion of a stay member. The headrest core 12 is embedded in a cushion pad 13 molded with a foamed resin material. An accommodation recess 13a is formed on the front surface of the cushion pad 13, and a film speaker 17 is embedded on the bottom surface thereof. The cushion plate 20 is fitted into the receiving recess 13a. The lead wire 19 connected to the film speaker 17 is introduced into the inside through an introduction hole 11b formed in the stay member 11, and is led out from the lower end opening of the leg portion 11a.
[Selection] Figure 4

Description

  The present invention relates to a headrest mounted on an upper portion of a backrest of a seat of an automobile, for example, and more particularly to a headrest with a speaker and a method for manufacturing the same.

  As a headrest with a speaker, one described in Patent Document 1 has been proposed. This headrest is configured by mounting side portions with built-in speakers on the left and right sides of the headrest body.

  Moreover, what was disclosed by patent document 2 is proposed as a motor vehicle seat provided with the speaker. A headrest is provided on the upper portion of the seat, and a headrest bracket serving as a core is embedded in a rear pad constituting the headrest. A recess is formed in the rear pad, and a speaker is accommodated in the recess, and the speaker is attached to the bracket by a bolt and a nut. Furthermore, the opening of the recess is shielded by a front pad, and the surface of the front pad is covered with a skin.

Furthermore, what was disclosed by patent document 3 is proposed as a pillow speaker apparatus for vehicle-mounted seats. In this pillow speaker device, a frame is housed inside an elastic body, an opening is provided on the front surface of the elastic body, the front surface of the opening is covered with a hard cover, and the speaker attached to the back surface of the cover The unit is accommodated in the opening, the cover is attached to the frame body with bolts and nuts, and the front surface of the resin cover is covered with a protective elastic body.
JP 2005-58287 A Japanese Utility Model Publication No. 2-92749 JP-A-5-262184

  However, since the headrest with a speaker described in Patent Document 1 uses an electrodynamic speaker provided with a magnetic circuit or the like, the number of speaker mounting parts increases and the weight and volume of the speaker increase. Therefore, a rigid mounting seat is required, and there is a problem that assembly to the headrest body is troublesome.

  Further, in an automobile seat provided with a speaker disclosed in Patent Document 2, a headrest bracket serving as a core body is embedded in a rear pad, and the speaker is accommodated in a recess formed in the rear pad, and the speaker is attached to the bracket. It is attached with bolts and nuts. For this reason, as with the headrest described in Patent Document 1, the number of speaker mounting parts increases, and the speaker weight and volume increase. Therefore, a rigid mounting seat is required, and manufacturing and assembly are possible. There was a problem of being troublesome.

  Furthermore, since the pillow speaker device for in-vehicle seats disclosed in Patent Literature 3 needs to attach a speaker to the cover and attach a cover to the frame, the speaker, like the headrest described in Patent Literature 1, is required. As the number of mounting parts increases and the weight and volume of the speaker increase, a rigid mounting seat is required, and there is a problem that manufacturing and assembly are troublesome.

  Since the speakers described in Patent Literatures 1 to 3 are of a three-dimensional electrodynamic type, when the speaker is inserted into the cushion pad constituting the headrest, the speaker is supported by a core material such as a bracket. Not only are the components necessary, but it is also necessary to devise measures to prevent the cushion pad from coming into contact with the diaphragm of the speaker. Therefore, there is a problem that it is very difficult to insert a speaker when molding the cushion pad.

  An object of the present invention is to provide a headrest that can be easily manufactured by reducing the number of mounting parts of the speaker, and that can be easily inserted when foaming a cushion pad, and a method for manufacturing the headrest. .

  In order to solve the above problem, the invention according to claim 1 is a headrest in which a bag-like skin is covered on the surface of a cushion pad formed by embedding the upper part of a stay member having a pair of legs. A film speaker is accommodated in the bottom of an accommodation recess formed in the front surface of the cushion pad, a cushion plate is accommodated in the accommodation recess so as to cover the surface of the film speaker, and the front surface of the cushion plate is covered by the skin The summary is as follows.

  According to a second aspect of the present invention, in the first aspect, the lead wire connected to the film speaker is introduced into an inside through an introduction hole formed in a pipe constituting the stay member, and from a lower end opening of the leg portion. The gist is derived.

  The gist of a third aspect of the present invention is that, in the first or second aspect, the film speaker is housed in an arc shape that is displaced rearward toward the center with respect to the horizontal direction or the vertical direction of the headrest.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a headrest core provided in an upper portion of the stay member is embedded in the cushion pad, and a front surface of the core and a film The gist is that the cushion pad is interposed between the speaker and the speaker.

  According to a fifth aspect of the present invention, in the film speaker according to any one of the first to fourth aspects, the outer peripheral edge of the bottom surface of the housing recess formed in the cushion pad is exposed and stored in the housing recess. The gist is that the back surface of the cushion plate is adhered to the exposed bottom surface with an adhesive.

  According to a sixth aspect of the present invention, an accommodation recess is formed on the front surface of the cushion pad with respect to the molding surface of the split mold that molds the front side of the cushion pad among the plurality of openable and closable split molds constituting the mold. Using a molding die provided with a recess molding portion, the upper portion of the stay member is accommodated in the cavity of the molding die, and a pair of leg portions are led out of the molding die, on the surface of the recess molding portion. A step of attaching a film speaker, a step of supplying a foamed resin raw material to the cavity of the mold and foaming the cushion pad, and a mold formed on the front surface of the cushion pad formed by opening the mold The gist is to include a step of housing the cushion plate in the housing recess and a step of covering the cushion pad and the surface of the cushion plate with a bag-like skin after the above step.

  According to the seventh aspect of the present invention, an accommodation recess is formed on the front surface of the cushion pad with respect to the molding surface of the split mold that molds the front side of the cushion pad among the plurality of openable and closable split molds constituting the mold. Using a molding die provided with a recess molding part, housing the upper portion of the stay member in the cavity of the molding die, and leading out the pair of legs to the outside of the molding die; Supplying a foamed resin raw material to foam the cushion pad; and housing the film speaker and the cushion plate in a housing recess formed on the front surface of the cushion pad formed by opening the mold. And a step of covering the surface of the cushion pad and the cushion plate with a bag-like skin after the above steps.

(Function)
In the present invention, since the front and rear surfaces of the film speaker are held by the cushion plate and the cushion pad, it is not necessary to attach the film speaker to a core member such as a stay member or a cushion core attached to the stay member. Mounting parts for mounting on the material are not required.

  According to the present invention, since a film speaker mounting part to the core material is not required, the number of parts can be reduced and manufacturing can be easily performed. Further, since the film speaker is housed in the bottom of the housing recess formed on the front surface of the cushion pad, the cushion speaker is mounted by mounting the film speaker on the surface of the recess molding portion formed on the molding surface of the molding die. The film speaker can be easily inserted into the cushion pad during foam molding.

Hereinafter, an embodiment in which the headrest of the present invention is embodied in a headrest provided on an upper part of a vehicle seat will be described with reference to FIGS.
First, the configuration of the headrest will be described with reference to FIGS. 4 and 5. This headrest is provided with a headrest core 12 made of a hard synthetic resin on an upper portion of a stay member 11 having a pair of leg portions 11 a, and the headrest core. The surface of a cushion pad 13 made of urethane foam formed by embedding 12 is covered with a bag-like skin 14 made of natural leather, fabric, synthetic leather or the like. A housing recess 13a is formed on the front surface of the cushion pad 13, and a piezoelectric film speaker 17 is housed on the bottom thereof. The film speaker 17 is constituted by a film of a piezoelectric element that vibrates with a change in voltage. As shown in FIG. 5, the film speaker 17 is embedded between the cushion pad 13 and the cushion plate 20 in an arc shape that is displaced rearward toward the center in the left-right direction. The leading end of the lead wire 19 connected to the film speaker 17 is introduced into the leg portion 11a from the introduction hole 11b formed in one leg portion 11a of the leg portion 11a, and then the lower end of the leg portion 11a. It is led out from the opening and connected to an amplifier (not shown) provided in the passenger compartment. The diameter of the introduction hole 11b is set so that a gap between the lead wire 19 and the lead wire 19 is small, so that the resin does not enter the stay member 11 during foam molding of the cushion pad 13 described later. A cushion plate 20 made of slab urethane is housed in the housing recess 13 a of the cushion pad 13.

  Next, based on FIG.1 and FIG.2, the shaping | molding die 21 used for the manufacturing method of the headrest comprised as mentioned above is demonstrated. As shown in FIG. 1, the molding die 21 connects a first die 22 and a second die 23 by a hinge mechanism 24 so as to be openable and closable, and a third die is connected to the first die 22 via a hinge mechanism 25. 26 is connected to the upper part of the second mold 23 via a hinge mechanism 27 so that the fourth mold 28 can be opened and closed. As shown in FIG. 2, a recess molding portion 29 for molding the accommodation recess 13 a in the cushion pad 13 is integrally formed on the molding surface 23 a inside the second mold 23. As shown in FIG. 2, the surface 29a of the recess forming portion 29 is formed in a gentle arc shape so as to be higher toward the center in the left-right direction, and the film speaker 17 is attached to the surface 29a with, for example, a double-sided adhesive tape It is possible.

Next, a method for manufacturing a headrest using the mold 21 configured as described above will be described.
First, as shown by a two-dot chain line in FIG. 6, the headrest core 12 is mounted on the upper portion of the stay member 11, and the lead wire 19 connected to the film speaker 17 is connected to the leg from the introduction hole 11b formed in the leg portion 11a. After being inserted into the portion 11a, it is led out from the tip opening of the leg portion 11a.

  Next, with the mold 21 in FIG. 1 opened, the film speaker 17 is attached to the recess molding portion 29 of the second mold 23 using the double-sided adhesive tape 30. Thereafter, the headrest core 12 is accommodated in the cavity K of the mold 21 and the pair of legs 11a of the stay member 11 is placed between the mold-matching surfaces between the third mold 26 and the fourth mold 28 by mold matching. Hold on.

Next, as shown in FIG. 1, a foamed resin raw material such as foamed urethane is supplied into the cavity K of the mold 21 from the resin injection hole 28 a formed in the fourth mold 28.
After the foamed resin material is foam-cured in the cavity K and the cushion pad 13 is foam-molded, the first mold 22 and the second mold 23 of the mold 21 are opened, and the third mold 26 and the second mold 23 are opened. The 4 mold 28 is opened and the cushion pad 13 is taken out from the cavity K together with the stay member 11. At this time, the back surface of the film speaker 17 is bonded to the cushion pad 13 with an adhesive force stronger than the adhesive force of the double-sided adhesive tape 30, and the lead wire 19 connected to the film speaker 17 is embedded in the cushion pad 13. Therefore, the recess forming portion 29 of the second mold 23 that has been adhered to the film speaker 17 by the double-sided adhesive tape 30 is separated from the film speaker 17.

  In this state, as shown in FIG. 3, the accommodation recess 13 a is molded by the recess molding portion 29 with respect to the cushion pad 13. As shown in FIG. 2, since the film speaker 17 is stuck so as to leave the outer peripheral edge of the surface 29a of the recess molding portion 29, the film speaker 17 does not exist on the bottom surface of the housing recess 13a. A square annular exposed bottom surface 13b is formed. After the adhesive is applied to the exposed bottom surface 13b, the cushion plate 20 is fitted into the housing recess 13a, and the cushion plate 20 is bonded to the cushion pad 13 with the adhesive. Thereafter, the outer peripheral surfaces of the cushion pad 13 and the cushion plate 20 are covered with the bag-shaped skin 14, thereby completing the headrest manufacturing operation shown in FIGS. 4 and 5.

Next, the operation of the headrest configured as described above will be described.
When a voltage is applied to the headrest film speaker 17 shown in FIGS. 4 and 5 from an amplifier (not shown) through a lead wire 19, the piezoelectric element constituting the film speaker 17 is vibrated, and sound is generated by this vibration. Since the front and rear surfaces of the speaker 17 are held by the cushion plate 20 and the cushion pad 13 that can be elastically deformed, vibration of the speaker is allowed.

According to the headrest of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the film speaker 17 is housed in the bottom of the housing recess 13a formed on the front surface of the cushion pad 13, and the front surface of the film speaker 17 is covered by the cushion plate 20 fitted in the housing recess 13a. Is retained. For this reason, unlike the structure in which the film speaker 17 is attached to, for example, the stay member 11 or a core material such as the headrest core 12 attached to the stay member 11, no attachment parts are required, and the number of parts is reduced and manufacture is facilitated. It can be carried out.

  (2) In the above embodiment, as shown in FIG. 4, the film speaker 17 is embedded in front of the headrest core 12 via the elastically deformable cushion pad 13, and the cushion plate 20 is disposed on the front surface of the film speaker 17. Since the contact is made, the vibration of the film speaker 17 when the sound is generated is appropriately allowed. Moreover, since the sound propagated rearward from the film speaker 17 is reflected forward by the front surface of the headrest core 12, the sound volume forward can be improved.

  (3) In the above embodiment, as shown in FIG. 1 and FIG. 2, the concave molding portion 29 is provided on the molding surface 23 a of the second mold 23, and the film speaker 17 is pasted on the surface 29 a of the concave molding portion 29. I tried to wear it. For this reason, the speaker 17 can be easily inserted into the bottom of the housing recess 13a formed in the cushion pad 13 when the cushion pad 13 is foam-molded.

  (4) In the above embodiment, since the film speaker 17 is embedded in the cushion pad 13 and the film speaker 17 itself has a property of being easily deformed, the human back is placed on the front surface of the cushion plate 20 of the headrest. Even if it is pressed, there is no feeling that foreign matter is buried, and the cushion function as a headrest can be properly maintained.

(5) In the above embodiment, since the film speaker 17 is used, the vibration area can be widened and sound can be generated over a wide range of the headrest.
(6) In the above embodiment, as shown in FIG. 5, since the film speaker 17 is housed in an arc shape that is displaced rearward toward the center in the left-right direction, the sound generated from the film speaker 17 is forward of the film speaker 17. It can be directed to the center. For this reason, an audible sound volume can be raised.

In addition, you may change the said embodiment as follows.
As shown in FIG. 7, a female connector terminal 35 connected to the lead wire 19 is inserted into the side surface of the cushion pad 13, and the cushion plate 20 is molded on the front surface of the cushion pad 13. You may make it form the engaging part 20a engaged with the groove part 13c. Although not shown, the second mold 23 is provided with a support for supporting the connector terminal 35. The connector terminal 35 is connected to a male connector terminal connected to a lead wire connected to an amplifier (not shown).

  As shown in FIG. 8, the connector terminal 35 is embedded in the cushion pad 13 so that the female connector terminal 35 connected to the lead wire 19 is exposed in the accommodation recess 13 a of the cushion pad 13. After forming the cushion pad 13, the film speaker 17 is accommodated in the accommodation recess 13 a, and the male connector terminal 36 connected to the film speaker 17 is connected to the connector terminal 35. Although not shown, a support portion for mounting the connector terminal 35 is formed in the recess forming portion 29 of the second mold 23.

  As shown in FIG. 9 (a), the film speaker 17 is embedded in a curved shape in an arc so that the center portion is rearward in the vertical direction, or in the horizontal direction as shown in FIG. 9 (b). The central portion may be curved and embedded in an arc shape that is displaced forward, or may be embedded in a flat shape as shown in FIG.

As shown in FIG. 10, for example, film speakers 17 may be embedded in two places at predetermined intervals in the left-right direction to generate stereo sound.
-Although not shown in the figure, by erected locking pins at a plurality of locations on the surface 29a of the recess forming portion 29, and locking each locking pin in a locking hole formed in the film speaker 17, The film speaker 17 may be mounted on the surface 29 a of the recess forming part 29.

-You may actualize to the headrest which abbreviate | omitted the said headrest core 12. FIG.
-You may embody in the headrest of various seats other than a vehicle seat.

The longitudinal cross-sectional view of the shaping | molding die used for manufacture of the headrest of this invention. The fragmentary perspective view of a shaping | molding die. The perspective view of the cushion pad and cushion plate explaining the manufacturing method of a headrest. The longitudinal cross-sectional view of a headrest. The plane sectional view of a headrest. The perspective view of a stay member, a headrest core, and a film speaker. The isolation | separation perspective view of the cushion pad and cushion plate which shows another embodiment of this invention. The perspective view which shows another embodiment of this invention. (A)-(c) is a perspective view which shows another example of the embedding form of a film speaker. The top view which shows another embodiment of this invention.

Explanation of symbols

  K ... cavity, 11 ... stay member, 11a ... leg, 11b ... introduction hole, 12 ... headrest core, 13 ... cushion pad, 13a ... accommodation recess, 13b ... exposed bottom, 14 ... skin, 17 ... film speaker, 19 DESCRIPTION OF SYMBOLS ... Lead wire, 20 ... Cushion plate, 21 ... Mold, 23a ... Molding surface, 29 ... Recess molding part, 29a ... Surface.

Claims (7)

In the headrest in which the upper part of the stay member having a pair of legs is embedded and the surface of the cushion pad is covered with a bag-like skin,
The film speaker is accommodated in the bottom of the accommodation recess formed on the front surface of the cushion pad, the cushion plate is accommodated in the accommodation recess so as to cover the surface of the film speaker, and the front surface of the cushion plate is covered with the skin Headrest characterized by that. 2. The lead wire connected to the film speaker according to claim 1, wherein the lead wire is introduced into an inside from an introduction hole formed in a pipe constituting the stay member and led out from a lower end opening of a leg portion. Headrest. 3. The headrest according to claim 1, wherein the film speaker is accommodated in an arc shape that is displaced rearward toward the center portion in the left-right direction or the up-down direction of the headrest. The headrest core provided in the upper part of the said stay member is embed | buried under the inside of the said cushion pad in any one of Claims 1-3, Between the front surface of this core and a film speaker, the said cushion pad A headrest characterized by having intervened. 5. The film speaker according to claim 1, wherein the outer peripheral edge of the bottom surface of the housing recess formed in the cushion pad is exposed and stored in the housing recess, and the cushion plate is formed on the exposed bottom surface. A headrest characterized in that the back surface of is bonded with an adhesive. Molding die provided with a recess molding part that forms a housing recess on the front surface of the cushion pad, compared to the molding surface of the split die that molds the front surface side of the cushion pad among a plurality of split molds that can be opened and closed constituting the molding die Using,
The upper part of the stay member is accommodated in the cavity of the molding die, a pair of leg portions is led out of the molding die, and a film speaker is attached to the surface of the recess molding portion;
Supplying a foamed resin raw material to the cavity of the mold and foaming the cushion pad;
Accommodating the cushion plate in an accommodation recess formed on the front surface of the cushion pad formed by opening the mold;
A method of manufacturing a headrest, comprising a step of covering the surface of the cushion pad and the cushion plate with a bag-like skin after the above step. Molding die provided with a recess molding part that forms a housing recess on the front surface of the cushion pad, compared to the molding surface of the split die that molds the front surface side of the cushion pad among a plurality of split molds that can be opened and closed constituting the molding die Using,
Containing the upper part of the stay member in the cavity of the mold, and leading out the pair of legs to the outside of the mold;
Supplying a foamed resin raw material to the cavity of the mold and foaming the cushion pad;
A step of accommodating the film speaker and the cushion plate in an accommodation recess formed on the front surface of the cushion pad formed by opening the mold;
A method of manufacturing a headrest, comprising a step of covering the surface of the cushion pad and the cushion plate with a bag-like skin after the above step.

Images