IPC 6 English version H04R !A-H04R 31/00

H04R-H04R03100

SECTION H– ELECTRICITY

H 04

ELECTRIC COMMUNICATION TECHNIQUE

H 04 R

LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (generating mechanical vibrations in general B 06 B; transducers for measuring particular variables G 01; transducers in clocks G 04; producing sounds with frequency not determined by supply frequency G 10 K; transducers in recording or reproducing heads G 11 B; transducers in motors H 02) [6]

Note

This subclass covers:

–

loudspeakers, microphones, gramophone pick-ups or like transducers producing acoustic waves or variations of electric current or voltage;

–

arrangements actuated by variations of electric current or voltage for cutting grooves in records;

–

circuits for the above-mentioned arrangements;

–

monitoring or testing the above-mentioned equipment.

Details of transducers (diaphragms H 04 R 7/00; characterised by the nature of the transducer, see the relevant group of main groups H 04 R 9/00 to H 04 R 23/00; mounting radio sets or communication systems in helmets A 42 B 3/30; mountings specially adapted for telephone equipment H 04 M 1/02)

Casings; Cabinets; Mountings therein (H 04 R 1/28 takes precedence)

Structural association of microphone with electric circuitry therefor (in deaf-aid sets H 04 R 25/00)

Arranging circuit leads; Relieving strain on circuit leads

Mouthpieces; Attachments therefor

Earpieces; Attachments therefor

Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection

Throat mountings for microphones

Mounting or connecting stylus to transducer with or without damping means

Holders for styli; Mounting holders on transducers

Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purposes H 04 R 5/00)

for obtaining desired frequency characteristic only (circuits for combining transducers having different responses H 04 R 3/00)

Structural combinations of separate transducers or of parts of the same transducer and responsive respectively to two or more frequency ranges

Spatial arrangement of separate transducers responsive to two or more frequency ranges

Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means

Combinations of transducers with horns, e.g. with mechanical matching means (horns in general G 10 K)

for obtaining desired directional characteristic only

by using a single transducer with sound reflecting, diffracting, directing or guiding means

by using a single aperture of dimensions not greater than the shortest operating wavelength

in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone

by combining a number of identical transducers

Combinations of transducers with fluid-pressure or other non-electrical amplifying means

Special adaptations for subaqueous use, e.g. for hydrophone

Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H 04 R 1/14)

Circuits for transducers (for stereophonic arrangements H 04 R 5/04; arrangements for producing a reverberation or echo sound G 10 K 15/08; amplifiers H 03 F)

for preventing acoustic reaction

for correcting frequency response

of electrostatic transducers

of electromagnetic transducers

of variable-resistance microphones

for distributing signals to two or more loud-speakers

Cross-over networks

Stereophonic arrangements (stereophonic pick-ups H 04 R 9/16, H 04 R 11/12, H 04 R 17/08, H 04 R 19/10)

Note

In this group, the following expression is used with the meaning indicated:

–

"stereophonic arrangements" covers quadraphonic or similar arrangements. [3]

Spatial or constructional arrangements of loud-speakers

027

Spatial or constructional arrangements of microphones, e.g. in dummy heads [3]

033

Headphones for stereophonic communication [3]

Circuit arrangements (combinations of amplifiers H 03 F 3/68; stereophonic systems H 04 S)

Diaphragms for electromechanical transducers (in general F 16 J 3/00); Cones (for musical instruments G 10)

characterised by the construction

Plane diaphragms

comprising a plurality of sections or layers

comprising superposed layers separated by air or other fluid

comprising superposed layers in contact

Non-planar diaphragms or cones

corrugated, pleated, or ribbed

Mounting or tensioning of diaphragms or cones

at the periphery

Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands

Clamping rim of diaphragm or cone against seating

Tensioning by means acting directly on free portion of diaphragm or cone

Damping by means acting directly on free portion of diaphragm or cone (air damping H 04 R 1/28)

Transducers of moving-coil, moving-strip, or moving-wire type

Details

Construction, mounting, or centering of coil

Loud-speakers

Microphones

Telephone receivers

Gramophone pick-ups using a stylus; Recorders using a stylus

comprising two or more styli or transducers (H 04 R 9/16 takes precedence)

signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

11/

Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly co-acting with electromagnet H 04 R 13/00)

11/

Loud-speakers

11/

Microphones

11/

Telephone receivers

11/

Gramophone pick-ups using a stylus; Recorders using a stylus

11/

comprising two or more styli or transducers (H 04 R 11/12 takes precedence)

11/

signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously

11/

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

13/

Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

13/

Telephone receivers

15/

Magnetostrictive transducers (magnetostrictive elements in general H 01 L 41/00)

15/

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

17/

Piezo-electric transducers; Electrostrictive transducers (piezo-electric or electrostrictive elements in general H 01 L 41/00; details of piezo-electric or electrostrictive motors, generators or positioners H 02 N 2/00)

17/

Microphones

17/

Gramophone pick-ups using a stylus; Recorders using a stylus

17/

comprising two or more styli or transducers (H 04 R 17/08 takes precedence)

17/

signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously

17/

Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

19/

Electrostatic transducers

19/

characterised by the use of electrets [3]

19/

Loud-speakers (H 04 R 19/01 takes precedence) [3]

19/

Microphones (H 04 R 19/01 takes precedence) [3]

19/

Gramophone pick-ups using a stylus; Recorders using a stylus (H 04 R 19/01 takes precedence) [3]

19/

comprising two or more styli or transducers (H 04 R 19/10 takes precedence)

19/

signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously

21/

Variable-resistance transducers (gaseous-resistance transducers H 04 R 23/00; magneto-resistive transducers H 04 R 23/00)

21/

Microphones

21/

Gramophone pick-ups using a stylus; Recorders using a stylus

23/

Transducers other than those covered by groups H 04 R 9/00 to H 04 R 21/00

23/

Transducers using more than one principle simultaneously

25/

Deaf-aid sets (constructions of transducers per se H 04 R 9/00 to H 04 R 23/00; structural combination with spectacle frames G 02 C 11/06)

25/

adapted to be supported entirely by ear

25/

comprising pocket amplifiers

27/

Public address systems (circuits for preventing acoustic reaction H 04 R 3/02; circuits for distributing signals to loud-speakers H 04 R 3/12; amplifiers H 03 F)

27/

Amplifying systems for the deaf

27/

Electric megaphones

29/

Monitoring arrangements; Testing arrangements

31/

Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor