H
SECTION H — ELECTRICITY
 H04
ELECTRIC COMMUNICATION TECHNIQUE
 H04R
ELECTROMECHANICAL TRANSDUCERS (for performing mechanical work B06B; use of transducers as sensing elements for measuring G01, G04; construction or circuits of vibrators whose output is of frequency unrelated to that of the electric supply G10K; recording or reproducing heads incorporating transducers G11B; dynamo-electric machines H02K)
 H04R

Note(s)

This sub-class deals with (a) instruments capable of converting sonic, ultrasonic, or infrasonic waves, or other mechanical vibrations into variations of electric current or voltage or vice versa, (b) instruments actuated by variations of electric current or voltage for cutting grooves in records, (c) circuits for the instruments of (a) and (b), (d) deaf-aid sets, (e) public address systems, and (f) monitoring or testing the equipment of (a) to (e).

 H04R 1/00
Details of transducers covered by groups H04R 9/00-H04R 23/00 (diaphragms H04R 7/00; mountings specially adapted for telephone equipment H04M 1/02)
 H04R 1/02
·  Casings; Cabinets; Mountings therein (H04R 1/28 takes precedence)
 H04R 1/04
·  ·  Structural association of microphone with electric circuitry therefor (in deaf-aid sets H04R 25/00)
 H04R 1/06
·  Arranging circuit leads; Relieving strain on circuit leads
 H04R 1/08
·  Mouthpieces; Attachments therefor
 H04R 1/10
·  Earpieces; Attachments therefor
 H04R 1/12
·  Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
 H04R 1/14
·  Throat mountings for microphones
 H04R 1/16
·  Mounting or connecting stylus to transducer with or without damping means
 H04R 1/18
·  ·  Holders for styli; Mounting holders on transducers
 H04R 1/20
·  Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purposes H04R 5/00)
 H04R 1/22
·  ·  for obtaining desired frequency characteristic only (circuits for combining transducers having different responses H04R 3/00)
 H04R 1/24
·  ·  ·  Structural combinations of separate transducers or of parts of the same transducer and responsive respectively to two or more frequency ranges
 H04R 1/26
·  ·  ·  Spatial arrangement of separate transducers responsive to two or more frequency ranges
 H04R 1/28
·  ·  ·  Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
 H04R 1/30
·  ·  ·  Combinations of transducers with horns, e.g. with mechanical matching means (horns in general G10K)
 H04R 1/32
·  ·  for obtaining desired directional characteristic only
 H04R 1/34
·  ·  ·  by using a single transducer with sound reflecting, diffracting, directing or guiding means
 H04R 1/36
·  ·  ·  ·  by using a single aperture of dimensions not greater than the shortest operating wavelength
 H04R 1/38
·  ·  ·  ·  in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
 H04R 1/40
·  ·  ·  by combining a number of identical transducers
 H04R 1/42
·  Combinations of transducers with fluid-pressure or other non-electrical amplifying means
 H04R 1/44
·  Special adaptations for subaqueous use, e.g. for hydrophone
 H04R 1/46
·  Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H04R 1/14)
 H04R 3/00
Circuits for transducers (for stereophonic arrangements H04R 5/04; amplifiers H03F)
 H04R 3/02
·  for preventing acoustic reaction
 H04R 3/04
·  for correcting frequency response
 H04R 3/06
·  ·  of electrostatic transducers
 H04R 3/08
·  ·  of electromagnetic transducers
 H04R 3/10
·  ·  of variable-resistance microphones
 H04R 3/12
·  for distributing signals to two or more loud-speakers
 H04R 3/14
·  ·  Cross-over networks
 H04R 5/00
Stereophonic arrangements (stereophonic pick-ups H04R 9/16, H04R 11/12, H04R 17/08, H04R 19/10)
 H04R 5/00

Note(s)

In this group, the expression "stereophonic arrangements" covers quadraphonic or similar arrangements. [3]

 H04R 5/02
·  Spatial or constructional arrangements of loud-speakers
 H04R 5/027
·  Spatial or constructional arrangements of microphones, e.g. in dummy heads  [3]
 H04R 5/033
·  Headphones for stereophonic communication  [3]
 H04R 5/04
·  Circuit arrangements (combinations of amplifiers H03F 3/68; stereophonic systems H04S)
 H04R 7/00
Diaphragms for electromechanical transducers (in general F16J 3/00); Cones (for musical instruments G10)
 H04R 7/02
·  characterised by the construction
 H04R 7/04
·  ·  Plane diaphragms
 H04R 7/06
·  ·  ·  comprising a plurality of sections or layers
 H04R 7/08
·  ·  ·  ·  comprising superposed layers separated by air or other fluid
 H04R 7/10
·  ·  ·  ·  comprising superposed layers in contact
 H04R 7/12
·  ·  Non-planar diaphragms or cones
 H04R 7/14
·  ·  ·  corrugated, pleated, or ribbed
 H04R 7/16
·  Mounting or tensioning of diaphragms or cones
 H04R 7/18
·  ·  at the periphery
 H04R 7/20
·  ·  ·  Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
 H04R 7/22
·  ·  ·  Clamping rim of diaphragm or cone against seating
 H04R 7/24
·  ·  Tensioning by means acting directly on free portion of diaphragm or cone
 H04R 7/26
·  Damping by means acting directly on free portion of diaphragm or cone (air damping H04R 1/28)
 H04R 9/00
Transducers of moving-coil, moving-strip, or moving-wire type
 H04R 9/02
·  Details
 H04R 9/04
·  ·  Construction, mounting, or centring of coil
 H04R 9/06
·  Loud-speakers
 H04R 9/08
·  Microphones
 H04R 9/10
·  Telephone receivers
 H04R 9/12
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 9/14
·  ·  comprising two or more styli or transducers (H04R 9/16 takes precedence)
 H04R 9/16
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 9/18
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 11/00
Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly co-acting with electromagnet H04R 13/00)
 H04R 11/02
·  Loud-speakers
 H04R 11/04
·  Microphones
 H04R 11/06
·  Telephone receivers
 H04R 11/08
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 11/10
·  ·  comprising two or more styli or transducers (H04R 11/12 takes precedence)
 H04R 11/12
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 11/14
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 13/00
Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
 H04R 13/02
·  Telephone receivers
 H04R 15/00
Magnetostrictive transducers (magnetostrictive devices in general H01L 41/00)
 H04R 15/02
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 17/00
Piezo-electric transducers; Electrostrictive transducers (piezo-electric or electrostrictive devices in general H01L 41/00)
 H04R 17/02
·  Microphones
 H04R 17/04
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 17/06
·  ·  comprising two or more styli or transducers (H04R 17/08 takes precedence)
 H04R 17/08
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 17/10
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 19/00
Electrostatic transducers
 H04R 19/01
·  characterised by the use of electrets  [3]
 H04R 19/02
·  Loud-speakers (H04R 19/01 takes precedence)
 H04R 19/04
·  Microphones (H04R 19/01 takes precedence)
 H04R 19/06
·  Gramophone pick-ups using a stylus; Recorders using a stylus (H04R 19/01 takes precedence)
 H04R 19/08
·  ·  comprising two or more styli or transducers (H04R 19/10 takes precedence)
 H04R 19/10
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 21/00
Variable-resistance transducers (gaseous-resistance transducers H04R 23/00; magneto-resistive transducers H04R 23/00)
 H04R 21/02
·  Microphones
 H04R 21/04
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 23/00
Transducers other than those covered by groups H04R 9/00-H04R 21/00
 H04R 23/02
·  Transducers using more than one principle simultaneously
 H04R 25/00
Deaf-aid sets (constructions of transducers per se H04R 9/00-H04R 23/00; structural combination with spectacle frames G02C 11/06)
 H04R 25/02
·  adapted to be supported entirely by ear
 H04R 25/04
·  comprising pocket amplifiers
 H04R 27/00
Public address systems (circuits for preventing acoustic reaction H04R 3/02; circuits for distributing signals to loud-speakers H04R 3/12; amplifiers H03F)
 H04R 27/02
·  Amplifying systems for the deaf
 H04R 27/04
·  Electric megaphones
 H04R 29/00
Monitoring arrangements; Testing arrangements
 H04R 31/00
Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor