MXPA98001586A - Compac disc portable player - Google Patents

Abstract

The present invention relates to a portable CD player (41) characterized by an opposite pair of speakers (81) fixed on the player, and in that each speaker comprises a distributed mode acoustic radiator having a total transducer (9) and exclusively mounted there to vibrate the radiator causing its resonance

Description

COMPACT DISC PORTABLE PLAYER TECHNICAL FIELD The term refers to portable CD players and, more particularly, to players that include speakers that include panel elements that radiate acoustic waves. BACKGROUND OF THE TECHNIQUE In the document GB-- -2262861 a loudspeaker is suggested in • panel form or you can understand a multimodal radiator resonant element that is a unitary walled panel formed by two films of material with a spacing nucleus of lar-transversal cel construction, where the panel it is such that it has a proportion between the stiffness of -f lexion < B), in all orientations, and the cube of the mass of part1 per unit super fi elial area < jl.) of at least 10¡¡ a mounting device that supports the panel or • fixes it on a support body, in a non-amorphous way and an arctic lectrome drive device connected to the panel that serves to excite a multimodal resonance on the radiator panel in response to an electrical input within a working frequency band for the loudspeaker. US-A-5,349,575 to GOLDSTAR CO. presents a portable compact disc player comprising a thin body and a pair of loudspeakers arcuately detached on the body. PRESENTATION OF THE INVENTION Modalities of the present invention show members of nature, structure and configuration that can be obtained generally and / or specifically by means of the evaluation of the teachings of our F'CT publication co-pending No W097 / 09842 of the same date as the present one. Such members therefore have the ability to sustain and propagate energy input vibration by curving waves in operating area (s) < s) that extend transversely in relation to the thickness-frequently but not necessarily up to the edges of the member. s) t is con-figur n with or without rigidity ani otria :; -flexion to have resolvingly-distributed vibration components distributed over said area (s) in a manner beneficial to the acoustic connection to the ambient air, and have preferential predetermined locations or sites within said area for the device of conductor, particularly part (s) operatively active (s) or mobile) of the same e ffective (s) in relation to the activity of acoustic vibration in said area (s) and signals, usually electrical, which correspond to the acoustic content of such vibrational activity. Possibilities are proposed in the co-pending International Publication No. W097 / 09S42 for such members or in "passive" acoustic devices without transducer means, as for example for reverberation or for acoustic filtering or to acoustically "harmonize" a space or room * and in "active" acoustic devices with transducer means, such as for example in a wide range of sound sources or speakers when they are supplied with input signals for their conversion into said sound, or for example co or microphones when they are exposed to sound to be converted into other signals. This invention relates specifically to active acoustic devices, for example, in the form of loudspeakers for portable compact disc players. In the following description and in the re-indications, it is understood that the term "compact disk" encompasses analogue digitally coded discs such as, for example, digital video discs. Members as the above are referred to herein as radiators in a distributed manner and are characterized as in the above PCT application and / or otherwise as specifically provided herein. The invention is a portable compact disc player characterized by an opposite pair of loudspeakers in the form of a panel, and in that each loudspeaker comprises a member having the ability to sustain and propagate input vibrational energy by bending waves in at least one operative area that is obtained transversely of the thickness to have resonant mode vibration components) distributed in said at least one area and having predetermined e-fereneial locations or sites within said area for a transducer means., and that has a transducer fully and exlusively mounted in said member in one of said locations or places to vibrate the member to cause its resonance - forming an acoustic radiator that provides an acoustic output when resolved. of compact discs may comprise a body portion having a disc tray and a cover adapted for G? V on the disc plate, and the speakers may be mounted on the lid. Accordingly, the speakers may be hinged on the lid. Alternatively, the loudspeakers may each be housed in a slot in the lid for a loft motion between a stored position, in which the loudspeakers emitted substantially completely housed in the groove, and a position of use in which The speakers are positioned on opposite sides of the lid. Each radiator may comprise a rigid light panel having? X cell nucleus which is in opposite film layers. The radiator can be supported in a surrounding marero. A resilient suspension can be placed between the frame and the radiator.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated diagrammatically, by way of example, in the accompanying drawings, where Figure 1 is a diagram showing a loudspeaker of distributed mode of coexistence with that described and claimed in our International publication l co-pending No. W097 / 09842; Figure 2Ü is a partial section on line A-A of Figure 1; The -figure 2h. is a transverse view enlarged through a radiator of distributed mode of the type illustrated in figure 2a_ and showing two alternative constructions; Figure 3 is U.Y \? perspective view of a first modality of a portable CD player in one. storage position; Figure 4 is a perspective view of the player of Figure 3 in the utmost position of use; Figure 5 is an open view of part of the compact disc player of Figures 3 and 4; Figure 6 is a perspective view of a second embodiment of a portable compact disc player; and Figure 7 is an enlarged view of part of the compact disc player of Figure 6. PREFERRED MODALITIES FOR CARRYING OUT THE INVENTION With reference to Figure 1 of the drawings, a panel-shaped speaker is illustrated.; 81) of the type described and renamed in our international publication No, W097 / 09842 of the same date as the present one comprising a rectangular structure (1) carrying a resilient suspension (3) around its internal periphery which supports a panel < 2 > from ra.di < n i.An sound of distributed mode .. A transducer (9), for example in accordance with what is described in detail with reference to our pub lished publications on the co-pend lenses Nos. W097 / 09859, W097 / 09861, W097 / 09858 on the same date as the present one, is assembled totally and exclusively on the panel (2) in a predetermined location defined by the dimensions "x" and "y", whose location is calculated from conf rmity with what is described in our publication International co-pending No. W097 / 09842 on the same date as the present, to launch waves of inflection in the panel to cause the panel to resonate to radiate an acoustic output. The transducer < 9) is driven by a signal amplifier < 10), for example an audio amplifier, connected to the transducer by means of conductors < 28) «The a ?? < ? of ampli icator and the power requirements can be fully normal, similar to the speakers of co or convention type, being the sensitivity of the order of 86 • 88dB / watt under loading conditions. The amplifier load vte.ia is highly resistive to 6 ohms, handling a power of 20-80 watts. When the panel core and / or films are made of metal, they can be constructed to act as heat dissipation for the transducer to remove the coil of the transducer motor coil and thus improve power management. The figures ü and 2J? are typical partial cross sections through the loudspeaker < 81) of Figure 1. Figure 2a shows that the structure (1), periphery (3) and panel (2) are connected together by respective joints of adhesive bonding < twenty) . Suitable materials for the structure include extruded metal frame frames, for example, aluminum alloy or plastics. Suitable periphery materials include resilient materials such as foam rubber and foam plastic. Suitable adhesives for the joints (20) include epoxy, acrylic and cyanoacrylate adhesives, et. Figure 2Jl illustrates, on an enlarged scale, that the panel (2) is a rigid light panel having a core (22) for example of a rigid plastic foam (97) for example cross-linked polyvinyl loride or a cellular matrix ( 98), that is, a honeycomb matrix of sheet metal, plastic or the like, with the cells extending transversely in relation to the plane of the panel, and enclosed by opposite films (21), eg paper, cardboard, plastic or sheet or sheet metal. When the films are made of plastic, they are preferably reinforced with fibers, for example carbon, glass, Kevlar (MR) or the like, in a manner known per se to increase their modulus. Proposed materials for movie layers and reinforcements!;: 'include carbon, glass, Kevlar (MR), Nomex (MR), ie aramid ibra etc. , in various strata and textures, as well as paper, sheets of pressed paper, sheet, and several high-modulus synthetic plastic films, such as Mylar (MR), Kaptan (MR), polycarbonate, plastics or in plastics, polyester or related plastics, and plastics rested with fibers, etc. , as well as metal sheets or sheets. The Vectra grade research of liquid crystal polymer thermoplastics shows that they can be useful for the injection molding of 5 ultra-thin films or smaller sized envelopes, say up to about 30 cm in diameter. This material forms a Christian structure oriented in the direction of the injection, a preferred orientation, for the good propagation of the water energy from the point of activation to the perimeter of the panel. Incidentally, such molding for this or other thermoplastics allows the molding tool to carry location and registration features with, for example, slots or rings for the precise location of the transducer parts, for example, the motor coil and the suspension of magnets.

Additionally, with some weaker core materials, it is estimated that it would be useful to increase the thickness of the skin, as, for example, in an area or ring up to 150% of the diameter of the transducer? > to reinforce this, and to beneficially connect the vibration energy in the panel, a high frequency response will be improved with the softer foam materials of this shape. honeycombs 0 manufactured or corrugated sheet or sheet of aluminum alloy, or Kevlar (MR), not ex (MR), bound flat papers, and various synthetic plastic films, as well as expanded plastics or foams or materials of pulp, even airgel metals if they are of a sufficiently low density 5. Some suitable materials for the core layer effectively exhibit automatic film formation at the time of manufacture and / or otherwise have sufficient inherent stiffness to Use without lamination between the film layers A high performance cellular core material is known under the trade name "Rohacell" which can be adapted as a radiator pan that does not presents films In practical terms, the objective is a lightness and global rigidity suitable for a part -... la- purpose, which specifically includes optimization contributions of the film and film layers and transitions between them. Several of the formulations: preferred ions for the panel use metal skins and metal alloys, or alternatively, a carbon fiber reinforcement. Both these and also designs with an airgel alloy or metal honeycomb core have substantial radiofrequency screening properties that will be important in several EMC applications. Conventional cone or panel type speakers do not have any inherent EMC screening capabilities. In addition, the preferred form of piezo and electrodynamic transducers have negligible magnetic scattering or electron scattering fields. Conventional speakers have a large magnetic field, up to 1 meter apart unless specific compensating countermeasures are taken. When it is important to maintain the screening in one application, the electrical connection can be carried out on the conductive parts of an appropriate DML panel or an electrically conductive foam or a similar interface can be used for the edge assembly. The suspension (3) can cushion the edges of the panel (2) to avoid excessive movement of the edges of the panel. Additionally or alternatively, additional damping can be applied uvt, for example in the form of patches, fixed on the panel in selected positions to dampen an excessive movement to equally distribute the resonance in the panel. The patches can be made from an iturne-based material, as commonly used in conventional speaker enclosures or can be made from a resilient or rigid polymeric laminate material. Some materials, especially paper and cardboard, and some cores can be autoaggregated. When desired, damping can be increased in the 1. 0 construction of the panels using adhesives with resilient hardening instead of rigid hardening. Effectively said selective damping includes specific application on the panel including its material laniinado permanently) associated with the. Edges and spines can be especially important for dominant and less dispersed low frequency vibration panel modes. The edge fixing of the damping device can usefully lead to a panel with its fully framed sheet material, even though its spines may be relatively free, say for a desired extension to operation at low titers. The fixation can be by means of adhesive or self-adhesive materials. Other forms of useful damping, '?! especially in terms of more useful effects and / or medium and high frequencies can be achieved by means of suitable mass or masses fixed on the sheet material at predetermined effective average localized positions of said area. An acoustic panel in accordance with what is described above is bidirectional. The sound energy coming from the background is not strongly related in phase with the energy coming from the front. Therefore, the benefit of the overall addition of the acoustic power in the room, sound energy of uniform sequence distribution, reduced reflection and stationary wave effects and with the advantage of a superior reproduction of the space and natural environment in the reproduction is obtained of the recorded sounds. While the radiation from the acoustic panel is largely non-directional, the percentage of information related to phase is increased off-axis. For an improved approach to stereophonic image, the positioning of the loudspeakers, as frames, at the usual height of a standing person, confers the benefit of a slightly off-axis positioning for the person sitting normally, thus optimizing the stereo effect. In the same way, the left / right triangular geometry in relation to the person who is listening provides an additional angular component. As a result, a good stereo system can be obtained in this way. "There is an additional advantage for a group of listeners in comparison with conventional loudspeaker reproduction. The intrinsically scattered nature of acoustic panel sound radiation gives it a volume of sound that does not obey the law of the inverse square pair-to-distance for an equivalent point source. Due to the fact that the lowering of the intensity with the distance is much smaller than the precise by the law of the inverse square, then consequently in the case of the people who listen and are placed centrally and not optimally, the field The intensity of the loudspeaker promotes a superior stereo effect compared to conventional loudspeakers. This is due to the fact that people who listen placed out of center or suffer from the double problem due to the proximity to the nearest speaker; firstly, the excessive increase of the sound coming from the nearest speaker, and then the corresponding distribution of sound volume from the farthest speaker, There is also the advantage of a flat, panel-shaped speaker, light, visually attractive, of good sound quality and that requires only a translator and no transition to a full-range sound from each panel diaphragm. Figures 3 to 6 illustrate a portable personal compact disc player (41) of the type having a body (85) formed with a slit (82) through which the discs of the player and the buttons are loaded and removed. control (137) by which the player is operated. The player (41) is equipped with an opposite pair of loudspeakers (81) in -shaped form of thin members (40) articulated on opposite sides of the player- (41) pair found on each side of the player- in the form of sandwich. The loudspeakers (40) are sized to be exo-extensive with the player and are moved to be articulated from the closed position illustrated in Figure 3 towards the extended position illustrated in Figure 4 as indicated by the arrow "0" In the extended position, the body (85) of the player (41) tends to act as an acoustic screen separating the speakers (40) to improve channel separation. Each of the loudspeakers (40) in the form of a panel is in the form of a distributed-mode acoustic radiator of the type described above with reference to Figure 1 and Figure 2. Accordingly, each loudspeaker comprises a light, rigid panel (2) formed of a cellular number (22) buried by layers of film (21), the panel is mounted on a resilient suspension surrounding it (3), for example of rubber foam, which in turn is mounted in a light rectangular frame (1), for example, of plastic. A transducer (9), for example of the type described with reference to the co-pending International Publications Nos. W097 / 09859, W097 / 09861, W097 / 09858, is mounted on the panel (2) to send inflection waves to the panel for cause the panel to resonate producing an acoustic output ,, The transducers (9) are positioned in the respective panels (2) in predetermined locations, in accordance with what is stated in our International Application No. (our file P.5711). Figures 6 and 7 illustrate a portable compact disc player (41) of the type comprising a body (85) carrying an iscus carrier plate (86), operation buttons (137) and a tap (139) hinged as shown in FIG. illustrated by means of arrow "D" to close the platter by-tadisks. The player (41) is equipped with an opposite pair of loudspeakers (81) in the form of thin panel-like members which, as seen in (40) may be hinged on the sides of the cover (139) to be able to move from c nf rmity as indicated by arrow "E" from a closed position (not shown) to the extended position shown. Alternatively, as shown in (39) the loudspeaker loudspeakers (81) can be housed in a slot (not shown) in the cover (189) and slide in accordance with that indicated by the "F" arrow between extended positions. and retracted. Each of the loudspeakers in the form of a panel (39, 40) is in the form of a distributed-type acoustic radiator of the type described above with reference to figures 1 and 2. Accordingly, each loudspeaker comprises a lightweight panel , rigid (2) formed from a cell core (22) enclosed by layers of pe liu (21), the panel is mounted on 0 a resilient suspension surrounding it (3), for example foam rubber, mounted in turn, in a long rectangular frame (1), such as plastic. A transducer (9), for example of the type described with reference to our international publications copendievttes Nos. W097 / 09359, 5 W097 / 09861, W097 / 09858 is mounted on C? Ú? panel (2) to send waves of inflection to the panel to cause the panel to resonate producing an acoustic output. The transducers (9) are positioned in the respective logs (2) in predetermined locations in accordance with what is commented in our publication International co-pending No. W097 / 09842.

Claims (7)

1. EIV INDICATIONS 1. A portable compact disc player (41), characterized by an opposite pair of loudspeakers (81) in the form of a panel fixed on the player-, because each loudspeaker: comprises a member (2) having the capacity of sustain and propagate an input vibrational energy by bending waves at the other utmost operating area extending transversely relative to the pair thickness, having vibrating components of resonant triode 0 distributed over said at least one area and having locations or predetermined preferential sites within said area for a transducer device and having a transducer- (9) fully and exclusively mounted on said member in one of said locations or places to vibrate the member causing its resonance forming a radiator acoustic that provides an acoustic output when it resonates.
2. 2. A portable compact disc player according to claim 1, characterized by an 0 body portion (85) having a solid isosport (86) and a cover (139) adapted to be closed on the latin disc compartment and because loudspeakers (81) are mounted on the lid,
3. 3. A portable compact disc player according to claim 2, characterized in that the loudspeakers (81) are articulated on the lid.
4. 4. A portable CD player of according to claim 2, characterized in that the loudspeakers (81) are each housed in a slot in the cover (139) for a sliding movement between said stored position in which the loudspeakers are substantially fully housed in the groove, and a position of use in which the loudspeakers are positioned on opposite sides of the lid.
5. 5. A portable compact disc player according to any of the preceding claims, characterized in that C? CI? The radiator (2) comprises a rigid light panel having a cellular core (22) housed between opposing film layers (21).
6. 6. A portable compact disc player according to claim 5, characterized in that the radiator (2) is supported in a surrounding frame (1).
7. 7. A portable compact disc player according to claim 6, characterized by a resilient suspension (3) interposed between the frame and the radiator.