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IPC 7
H04R-H04R03100

SECTION H – ELECTRICITY


H 04ELECTRIC COMMUNICATION TECHNIQUE


H 04 RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (generating mechanical vibrations in general B06B; transducers for measuring particular variables G01; transducers in clocks G04; producing sounds with frequency not determined by supply frequency G10K; transducers in recording or reproducing heads G11B; transducers in motors H02) [6]


Notes

(1)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.

(2)Attention is drawn to the Notes following the titles of class B81 and subclass B81B relating to "micro-structural devices" and "micro-structural systems". [7]


Subclass Index

TYPES OF TRANSDUCER 

With magnetic circuit: 

moving coil; moving armature; magnetisable diaphragm; magnetostriction 

H04R 9/00; H04R 11/00; H04R 13/00; H04R 15/00 

Without magnetic circuit: 

piezo-electric; electrostatic; with variable resistance 

H04R 17/00; H04R 19/00; H04R 21/00 

Other types 

H04R 23/00 

Details 

general; circuits; diaphragms and cones 

H04R 1/00; H04R 3/00; H04R 7/00 

APPLICATIONS 

Stereophonic arrangements; deaf-aid; public address systems 

H04R 5/00; H04R 25/00; H04R 27/00 

MONITORING, TESTING; MANUFACTURE 

H04R 29/00; H04R 31/00 



1/

00Details of transducers (diaphragms H04R 7/00; characterised by the nature of the transducer, see the relevant group of main groups H04R 9/00 to H04R 23/00; mounting radio sets or communication systems in helmets A42B 3/30; mountings specially adapted for telephone equipment H04M 1/02)

1/

02.Casings; Cabinets; Mountings therein (H04R 1/28 takes precedence)

1/

04..Structural association of microphone with electric circuitry therefor (in deaf-aid sets H04R 25/00)

1/

06.Arranging circuit leads; Relieving strain on circuit leads

1/

08.Mouthpieces; Attachments therefor

1/

10.Earpieces; Attachments therefor

1/

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

1/

14.Throat mountings for microphones

1/

16.Mounting or connecting stylus to transducer with or without damping means

1/

18..Holders for styli; Mounting holders on transducers

1/

20.Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purposes H04R 5/00; speech enhancement by processing of the speech signal G10L 21/02)

1/

22..for obtaining desired frequency characteristic only (circuits for combining transducers having different responses H04R 3/00)

1/

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

1/

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

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

1/

30...Combinations of transducers with horns, e.g. with mechanical matching means (horns in general G10K)

1/

32..for obtaining desired directional characteristic only

1/

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

1/

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

1/

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

1/

40...by combining a number of identical transducers

1/

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

1/

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

1/

46.Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H04R 1/14)


3/

00Circuits for transducers (for stereophonic arrangements H04R 5/04; arrangements for producing a reverberation or echo sound G10K 15/08; amplifiers H03F)

3/

02.for preventing acoustic reaction

3/

04.for correcting frequency response

3/

06..of electrostatic transducers

3/

08..of electromagnetic transducers

3/

10..of variable-resistance microphones

3/

12.for distributing signals to two or more loud-speakers

3/

14..Cross-over networks


5/

00Stereophonic arrangements (stereophonic pick-ups H04R 9/16, H04R 11/12, H04R 17/08, H04R 19/10)

Note

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

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

5/

02.Spatial or constructional arrangements of loud-speakers

5/

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

5/

033.Headphones for stereophonic communication  [3]

5/

04.Circuit arrangements (combinations of amplifiers H03F 3/68; stereophonic systems H04S)


7/

00Diaphragms for electromechanical transducers (in general F16J 3/00); Cones (for musical instruments G10)

7/

02.characterised by the construction

7/

04..Plane diaphragms

7/

06...comprising a plurality of sections or layers

7/

08....comprising superposed layers separated by air or other fluid

7/

10....comprising superposed layers in contact

7/

12..Non-planar diaphragms or cones

7/

14...corrugated, pleated, or ribbed

7/

16.Mounting or tensioning of diaphragms or cones

7/

18..at the periphery

7/

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

7/

22...Clamping rim of diaphragm or cone against seating

7/

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

7/

26.Damping by means acting directly on free portion of diaphragm or cone (air damping H04R 1/28)


9/

00Transducers of moving-coil, moving-strip, or moving-wire type

9/

02.Details

9/

04..Construction, mounting, or centering of coil

9/

06.Loud-speakers

9/

08.Microphones

9/

10.Telephone receivers

9/

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

9/

14..comprising two or more styli or transducers (H04R 9/16 takes precedence)

9/

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

9/

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


11/

00Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly co-acting with electromagnet H04R 13/00)

11/

02.Loud-speakers

11/

04.Microphones

11/

06.Telephone receivers

11/

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

11/

10..comprising two or more styli or transducers (H04R 11/12 takes precedence)

11/

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

11/

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


13/

00Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

13/

02.Telephone receivers


15/

00Magnetostrictive transducers (magnetostrictive elements in general H01L 41/00)

15/

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


17/

00Piezo-electric transducers; Electrostrictive transducers (piezo-electric or electrostrictive elements in general H01L 41/00; details of piezo-electric or electrostrictive motors, generators or positioners H02N 2/00)

17/

02.Microphones

17/

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

17/

06..comprising two or more styli or transducers (H04R 17/08 takes precedence)

17/

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

17/

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


19/

00Electrostatic transducers

19/

01.characterised by the use of electrets  [3]

19/

02.Loud-speakers (H04R 19/01 takes precedence)  [3]

19/

04.Microphones (H04R 19/01 takes precedence)  [3]

19/

06.Gramophone pick-ups using a stylus; Recorders using a stylus (H04R 19/01 takes precedence)  [3]

19/

08..comprising two or more styli or transducers (H04R 19/10 takes precedence)

19/

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


21/

00Variable-resistance transducers (gaseous-resistance transducers H04R 23/00; magneto-resistive transducers H04R 23/00)

21/

02.Microphones

21/

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


23/

00Transducers other than those covered by groups H04R 9/00 to H04R 21/00

23/

02.Transducers using more than one principle simultaneously


25/

00Deaf-aid sets (constructions of transducers per se H04R 9/00 to H04R 23/00; structural combination with spectacle frames G02C 11/06; processing of speech signals G10L 21/00)

25/

02.adapted to be supported entirely by ear

25/

04.comprising pocket amplifiers


27/

00Public address systems (circuits for preventing acoustic reaction H04R 3/02; circuits for distributing signals to loud-speakers H04R 3/12; amplifiers H03F)

27/

02.Amplifying systems for the deaf

27/

04.Electric megaphones


29/

00Monitoring arrangements; Testing arrangements


31/

00Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor (processes or apparatus specially adapted for the manufacture of micro-structural devices or systems, e.g. in combination with electrical devices, B81C)


  
 

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