JP2007187976A - Projection screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection screen having a loudspeaker function and capable of being wound and stored. <P>SOLUTION: A loudspeaker formed from a piezoelectric film both side of which are laminated with electrode films is stacked to either of the back or front of the main body of a sheetlike screen and thereby the projection screen is obtained. In this case, it is preferable that the piezoelectric film is formed from a polyvinylidene fluoride resin and the electrode films is formed from vapor-deposited aluminum. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection screen having a speaker function and capable of being wound and stored.

  A projection screen for a conference or home theater is usually wound and stored in a storage case when not in use (see, for example, Patent Document 1). In such a projection screen, an external speaker is used as a sound wave generator, and a space for installing the speaker is required.

On the other hand, in recent years, a screen having a speaker function has been proposed in order to save a speaker installation space. For example, a vibration mode type panel type screen (for example, refer to Patent Document 2), a foamed plastic screen provided with a speaker integrally (for example, refer to Patent Document 3), and the like have been proposed. However, these screens cannot be wound and stored.
In addition, although it aims at a sound absorptivity, it is known to laminate | stack a fiber structure on a piezoelectric film (for example, refer patent document 4, patent document 5).

JP 2005-115340 A JP 2000-236595 A JP 2002-64898 A JP 2000-148155 A JP 2003-241765 A

  The present invention has been made in view of the above background, and an object thereof is to provide a projection screen having a speaker function and capable of being wound and stored.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have a speaker function by bonding a speaker made of a piezoelectric film having electrode films laminated on both sides thereof to a sheet-like screen body. In addition, the present inventors have found that a projection screen that can be wound and housed can be obtained, and have further intensively studied to complete the present invention.

Thus, according to the present invention, “a projection screen,
A projection screen, wherein a speaker made of a piezoelectric film having electrode films laminated on both sides thereof is bonded to at least one of a back surface and a front surface of a sheet-like screen main body. Is provided.

At this time, the piezoelectric film is preferably formed of a polyvinylidene fluoride resin. Moreover, it is preferable that the electrode film is formed of deposited aluminum. Moreover, it is preferable that the said electrode film is formed with a conductive polymer.
In the projection screen of the present invention, it is preferable that it can be wound and stored.

  According to the present invention, a projection screen having a speaker function and capable of being retracted and stored can be obtained.

Hereinafter, embodiments of the present invention will be described in detail.
In the present invention, the speaker is made of a piezoelectric film having electrode films laminated on both sides thereof. Here, examples of the piezoelectric film include polymer piezoelectric films such as polyvinylidene fluoride resin and polyvinylidene sianite resin, composite piezoelectric films, and piezoelectric ceramic plates that are polarized so as to vibrate in the plane direction. Is done. In particular, a piezoelectric film made of polyvinylidene fluoride (PVDF) that has been subjected to polarization treatment is excellent in flexibility, excellent in sensitivity characteristics, can be thinned and easily formed into an arbitrary shape, and the like. It has characteristics and is particularly preferable. The thickness of the piezoelectric film is preferably in the range of 40 to 250 μm.

  Electrode films are laminated on both sides of the piezoelectric film. The electrode film is preferably formed of aluminum deposited by a normal vapor deposition method, but may be formed of a conductive polymer. In that case, polyethylenedioxythiophene etc. are illustrated as a conductive polymer. The thickness of the electrode film is preferably in the range of 100 to 2000 mm.

In the projection screen of the present invention, the speaker is bonded to at least one (particularly preferably only the back surface) of the back surface and the front surface (surface for projecting an image) of the sheet-like screen body.
Here, the sheet-like screen main body is not particularly limited as long as it is in a sheet form, and examples thereof include a fabric-like fiber structure, a film, a metal foil, and a laminate thereof.

  The fiber constituting the fabric-like fiber structure is not particularly limited, and cotton, wool, hemp, viscose rayon fiber, polyester fiber, polyetherester fiber, acrylic fiber, nylon fiber, polyolefin fiber, cellulose acetate fiber, Ordinary fibers such as aramid fibers may be used. Of these, polyester yarns made of polyester fibers are particularly preferable in terms of tensile strength and dyeability.

  As such polyester, terephthalic acid is the main acid component, and alkylene glycol having 2 to 6 carbon atoms, that is, at least one selected from the group consisting of ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol and hexamethylene glycol. Examples include polyesters having a main glycol component of a particular glycol, particularly preferably ethylene glycol. Such a polyester may have a small amount (usually 30 mol% or less) of a copolymer component as required.

  In this case, examples of the bifunctional carboxylic acid other than terephthalic acid used include isophthalic acid, naphthalene dicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, P-oxybenzoic acid, 5 -Aromatic, aliphatic, and alicyclic bifunctional carboxylic acids such as sodium sulfoisophthalic acid, adipic acid, sebacic acid, and 1,4-cyclohexanedicarboxylic acid. Examples of the diol compound other than the glycol include aliphatic, alicyclic and aromatic diol compounds such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S, and polyoxyalkylene glycol. Can give.

  Such polyester may be synthesized by any method. For example, in the case of polyethylene terephthalate, terephthalic acid and ethylene glycol are directly esterified, or a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol, or terephthalic acid and ethylene oxide are used. And the first stage reaction to produce a glycol ester of terephthalic acid and / or its low polymer, and the first stage reaction product is heated under reduced pressure until the desired degree of polymerization is reached. It may be produced by a second stage reaction for condensation reaction.

  Further, in the polyester, a fine pore forming agent, a cationic dyeing agent, an anti-coloring agent, a heat stabilizer, a flame retardant, a fluorescent brightening agent, a matte, and the like are included in the polyester as long as the object of the present invention is not impaired. You may add 1 type, or 2 or more types of an agent, a coloring agent, an antistatic agent, a hygroscopic agent, an antibacterial agent, a negative ion generator.

  The fiber may be a short fiber or a long fiber. Among these, long fibers are preferable because a soft texture is easily obtained. Further, it may be a long fiber subjected to false twist crimping. At that time, the total fineness of the long fibers and the number of filaments are preferably in the range of the total fineness of 33 to 330 dtex and the number of filaments of 1 to 200. In addition, the cross-sectional shape of the single fiber is not particularly limited, and may be a normal round cross section, or a flat cross section, a constricted flat cross section, a triangular cross section, a square cross section, a 3-14 leaf cross section, or a hollow cross section.

The structure of the fabric-like fiber structure is not particularly limited, and may be a woven or knitted fabric or a nonwoven fabric knitted and woven by a normal method. For example, examples of the woven structure of the woven fabric include a three-layer structure such as plain weave, twill weave and satin weave, a change structure, a single double structure such as a vertical double weave and a horizontal double weave, and a vertical velvet. The type of knitted fabric may be a weft knitted fabric or a newly knitted fabric. Preferred examples of the weft knitting structure include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, floating knitting, one-sided knitting, lace knitting, bristle knitting, and the like. Single atlas knitting, double cord knitting, half tricot knitting, back hair knitting, jacquard knitting and the like are exemplified. The number of layers may be a single layer or a multilayer of two or more layers. The basis weight of the sheet-like screen body is preferably 500 g / m ² or less (more preferably 30 to 300 g / m ² ). If the basis weight is larger than 500 g / m ² , the sound wave generation function may be impaired.

  In such a sheet-like screen body, as long as the object of the present invention is not impaired, conventional dyeing finish processing, printing processing, water repellent processing, raising processing, ultraviolet shielding or antibacterial agent, deodorant, Various processes that provide functions such as insect repellents, phosphorescent agents, retroreflective agents, and negative ion generators may be additionally applied.

  Moreover, the film should just be able to project on a film, and what consists of organic polymers, such as polyester, is preferable, and a white polyester film is especially preferable. The metal foil is particularly preferably a glossy metal such as aluminum. The screen body may be coated with a resin. Examples of such resins include cellulose derivatives, styrene resins, styrene joints, acrylic resins, methacrylic resins, rosin ester resins, polyvinyl acetate resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate copolymers, polyesters. Examples thereof include a resin (polyethylene terephthalate resin), a polyurethane resin, a butyral resin, and a polyamide resin. Of these, acrylic resins are particularly preferable.

  As a method for bonding a speaker made of a piezoelectric film having electrode films laminated on both surfaces thereof to a sheet-like screen main body, for example, a method of bonding using an epoxy adhesive or the like is preferably exemplified.

  In the projection screen of the present invention, since the speaker made of a piezoelectric film having electrode films laminated on both sides thereof is laminated on the sheet-like screen body, it has not only a speaker function but also flexibility. The storage case can be wound and stored.

  Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.

[Example 1]
A plain woven fabric (weighing weight 130 g / m ² ) was woven using normal polyethylene terephthalate multifilament false twist crimped yarn 56 dtex / 72 fil for warp and weft to obtain a sheet-like screen body.
On the other hand, as a speaker, a flexible piezoelectric film (KF piezo film (trade name) manufactured by Kureha Chemical Co., Ltd.) in which aluminum (thickness: 500 mm) is deposited on both sides of a film made of polarized polyvinylidene fluoride resin is prepared. did.

Next, a projection screen was obtained by adhering the flexible piezoelectric film to the back side of the screen main body (the surface not projected) with a polyurethane-based adhesive.
Next, when the aluminum layer of the speaker and the headphone terminal of the portable music player were connected by a conductive wire to reproduce the music, the music was heard from the screen and had a speaker function.
Further, the projection screen can be wound and stored in a storage case.

  ADVANTAGE OF THE INVENTION According to this invention, the projection screen which has a speaker function and can be wound up and stored is provided, The industrial value is very large.

Claims (5)

A projection screen,
A projection screen, wherein a speaker made of a piezoelectric film having electrode films laminated on both sides thereof is bonded to at least one of a back surface and a front surface of a sheet-like screen main body.   The projection screen according to claim 1, wherein the piezoelectric film is made of a polyvinylidene fluoride resin.   The projection screen according to claim 1 or 2, wherein the electrode film is formed of vapor-deposited aluminum.   The projection screen according to claim 1, wherein the electrode film is formed of a conductive polymer.   The projection screen according to claim 1, which can be wound and stored.