Abstract: A device (8) which includes an electroacoustic transducer (7) for the acoustic reproduction of sound signals to an ear (14) of a user (2) who assumes a user position at the device. The transducer is optimized for the acoustic reproduction of speech-signal sound waves and is equipped with arrangement means (25) for realizing a distinct directivity for the speech-signal sound waves emitted by the transducer. As a result of its directivity, the transducer directs the speech-signal sound waves which it emits preferentially to the ear of a user who is in the user posture.

Abstract: In an apparatus (1) having a housing (2) with a first housing wall (4) and having a printed circuit board (8) which extends parallel to the first housing wall (4), an electroacoustic transducer (10) is mounted on the printed circuit board (8) with the aid of a holder (14), the holder (14) being mounted so as to be movable transversely with respect to the printed circuit board (8) and a spring device (17) being provided to urge the holder (14) together with the transducer (10) towards the first housing wall (4) under a spring load, and a part of the holder (14), at the same time, forming a sealing device(15), which guarantees a nominal isolation between the front (11) and the rear (120 of the transducer (10).

Abstract: In an adapted to be used in an on-ear mode and in an off-ear mode a holder compartment (6)accommodates a first transducer (20)and a second transducer (25)and the holder compartment (6)is bounded by a bounding wall (7)formed with internal sound ports (10, 11)and at least one additional internal sound port (22), and an outer wall (3)formed with external sound ports (15, 16)is spaced at a distance from the bounding wall (7), and at least one additional external sound port (19)is provided between the bounding wall (7)and the outer wall (3), and the two transducers (20, 25)can be driven with useful signals of the same phase in the off-ear mode and with useful signals of opposite phase in the on-ear mode.

Abstract: An electroacoustic transducer (1) having an oscillator coil (15) which has two connecting leads (27, 28) is equipped with at least one retaining element (33, 34) for each connecting lead (27, 28), each retaining element (33, 34) being connected to a stationary component (2) of the transducer (1) and being held movable in relation to said stationary component (2), while said stationary component (2) borders a holding space (39, 40) through which a connecting lead (27, 28) being passed through.

Abstract: In an apparatus (1) having a housing (2) and having an electroacoustic transducer (14) accommodated in the inner housing space (9) and having at least one passage (28, 29) which traverses a housing wall (6, 7) and which, together with the inner housing space (9) and the rear volume (25) of the transducer (14), which rear volume (25) is open to the inner housing space (9), forms an absorption-circuit resonator which causes a dip (31) in the sound pressure versus frequency response(27), a compensator (32) for the compensation of the dip (31) in the sound pressure versus frequency response (27) is provided and includes the housing (2) being provided with a plurality of ducts (33, 34, 35, 36; 41) traversing the housing (2), each duct forming an acoustic friction.

Abstract: In an electroacoustic transducer (1) having a hollow cylindrical magnet system (8) and a contact holding assembly (22), retained in an inner zone (21), for holding spring contacts (37, 38), the contact holding assembly (22) includes two preferably identical contact holding elements (23, 24) which adjoin one another along two identically shaped bounding surfaces (26, 28), and each contact holding element (23, 24) has a holding chamber (29, 30) which opens towards its bounding surface (26, 28), each holding chamber (29, 30) accommodating a spring contact (37, 38) inserted into the holding chamber (29, 30) from the side of the bounding surface (26, 28).

Abstract: In an electroacoustic transducer (1) having a hollow cylindrical magnet system (8) and having contact holding means (22), which are retained in the inner zone (21), for holding spring contacts (37, 38), the contact holding means (22) consist of two preferably identical contact holding elements (23, 24) which adjoin one another along two identically shaped bounding surfaces (26, 28), and each contact holding element (23, 24) has a holding chamber (29, 30) which opens towards its bounding surface (26, 28), each holding chamber (29, 30) accommodating a spring contact (37, 38) inserted into the holding chamber (29, 30) from the side of the bounding surface (26, 28).

Abstract: In an apparatus (1) having an electroacoustic transducer (14) and having a printed circuit board (51) the electroacoustic transducer (14) has two terminal contact elements (36, 37) and the printed circuit board (51) has two mating contact elements (52, 53), which terminal contact elements (36, 37) have two terminal contact portions (38, 39) which are oriented parallel to the transducer axis (34) of the transducer (14) and which mating contact elements (52, 53) have two mating contact portions (56, 57) which are oriented parallel to the transducer axis (34), the terminal contact portions (38, 39) and the mating contact portions (56, 57) being held pairwise against each other in a direction transverse to the transducer axis (34) and thus forming at least parts of a retainer (72) with the aid of which the transducer (14) is secured to the printed circuit board (51).

Abstract: In a device (8) which includes an electroacoustic transducer (7) for the acoustic reproduction of sound signals to an ear (14) of a user (2) who assumes a user position at the device (8), the transducer (7) is optimized for the acoustic reproduction of speech-signal sound waves and is equipped with additional means (25) for realizing a distinct directivity for the speech-signal sound waves emitted by said transducer (7) and, as a result of its directivity, the transducer (7) directs the speech-signal sound waves which it emits preferentially to the ear (14) of a user (2) who is in the user posture.

Abstract: An electroacoustic transducer (1) having a voice coil (17) and having a diaphragm (19) with an annular intermediate zone (22) for securing the voice coil (17), the intermediate zone (22) having angularly spaced-apart trough portions (29) which are each bounded by a trough bottom wall (30) and two trough side walls (31, 32), and the voice coil (17) being secured to the trough bottom walls (30).

Abstract: An apparatus (1) is constructed for operation in an on-ear mode and an off-ear mode and includes a housing wall (6) having passages (15) to allow useful sound waves to pass through, and additional passages (16) to allow the passage of sound waves which are in phase opposition to the useful sound waves and includes, behind the housing wall (6), an electroacoustic transducer (7) having a diaphragm (12), the transducer (7) being accommodated in an acoustically substantially impervious holder compartment (17). Sound-pressure frequency response influencing structures (18, 19) are arranged both in the sound path between the frontside (13) of the diaphragm (12) and the passages (15), and in the sound path between the rearside (14) of the diaphragm (12) and the additional passages (16).

Abstract: In an electroacoustic transducer (1) having a diaphragm (19) and having a supporting means (25) for the diaphragm (19) the diaphragm (19) and the supporting structure (25) form a single part, and an annular outer zone (24) of the diaphragm (19) and a first annular zone (26) of the supporting structure (25) adjoin one another smoothly.

Abstract: In an electroacoustic transducer (1) including a substantially hollow cylindrical magnet system (9) which is substantially centro-symmetrical with respect to a transducer axis (2), a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) having two coil leads (20), and two contact terminals which, viewed in the direction of the transducer axis (2), are disposed inside the magnet system (9) and are each connected to one coil lead (20), the contact terminals are spring contacts (21, 22) which are formed with at least one bend and are preferably U-shaped, having two limbs (23, 24) extending transversely to the transducer axis (2) and including a first limb (23), which is mechanically connected to a contact holder (26) of the transducer (21), and a second limb (24) having contact faces (25) which are movable parallel to the transducer axis (2), the contact faces (25) of both spring contacts (21, 22) having different radial distances from the transducer axis (2).

Abstract: In an electroacoustic transducer (1) having a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) in the area of the rear volume (HV) and cooperating with a magnet system (9), and including a substantially annular closing member (30) for closing the rear volume (HV), the closing member (30) has an annular body (38) and a ring projection (39), which projects obliquely from the annular body (38) along its entire circumference and is movable against spring action, at least one passage (34, 35, 36, 37) of the closing member (30), this passage having been provided in order to realize an acoustic friction between the rear volume (HV) and the acoustic free space surrounding the transducer (1), terminating in the annular contact surface (32) of the annular body (38), this annular contact surface extending transversely to the transducer axis (2).

Abstract: The invention relates to the use of dibutyl malate as an attractant for domestically occurring flies, particularly of the species Musca domestica and Fannia canicularis, and to insect traps characterized by emanating dibutyl malate vapors. Preferably the dibutyl malate is diluted before evaporation with a liquid diluent or a solid diluent or carrier such that the concentration in or on the trap is below 10% by weight.

Abstract: The invention related to the use of monoalkyl citrates having an alkyl group of 7-10 carbon atoms as solubilizing agents in perfumery, cosmetics, personal care and household products consisting of oil-in-water emulsions as well as to hydrophobic cosmetic, personal care and household product ingredients containing such monoalkyl citrates. The emulsions preferably contain at least 0.01% w/w of monoalkyl citrate. Especially prefereed in monooctyl citrate.

Abstract: A process for imparting, enhancing or modifying the flowery odorous note in perfumes, perfume compositions or artificial essential oils, for use in a perfume composition, a perfumed article, a cologne, a foodstuff, an alcoholic or nonalcoholic beverage, a toothpaste, a medicinal product or a chewing gum, comprising the step of adding an organoleptic property modifying quantity of 1,1-Di(C.sub.1 -C.sub.6 -alkyl)-2-phenylethan derivatives of formula A, wherein R is a formyl-, hydroxymethyl-, formoxymethyl-, acetoxymethyl- or a nitrilo group and the total number of carbon atoms in both alkyl substituents together is at most 8. ##STR1## .

Abstract: Polyunsaturated cyclopentane derivatives of the general formula ##STR1## wherein R.sup.1 signifies a lower alkyl group with 1 to 3 carbon atoms and R.sup.2 signifies a hydroxymethyl, acetomethyl, or formyl group, and the wavy line on carbon atom 1 signifies epimeric forms have excellent aromatic properties and may be used in perfume compositions. The compounds in which R.sup.2 is hydroxymethyl have a pronounced sandalwood scent. Methods of production are also disclosed.

Abstract: A fixative for perfume compositions, 1-(2,6,6-trimethylcyclohexyl)-hexane-3-ol, itself odorless to many people, brings about a "rounding-off" of the perfume while increasing its intensity. The compound is made by condensation of citral with pentane-2-on, followed by cyclization and hydrogenation.

Abstract: A fixative for perfume compositions, 1-(2,6,6-trimethylcyclohexyl)-hexane-3-ol, itself odorless to many people, brings about a "rounding-off" of the perfume while increasing its intensity. The compound is made by condensation of citral with pentane-2-on, followed by cyclization and hydration.