(0)H04R:0/2:
IPC6
SECTION H - ELECTRICITY
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE...
H04R
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<<   >>   H04R001/00 - H04R001/46  

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.

 

 

 
 

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/ 00 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)

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/ 02 • Casings; Cabinets; Mountings therein (H 04 R 1/28 takes precedence)  

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

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/ 06 • Arranging circuit leads; Relieving strain on circuit leads  

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/ 08 • Mouthpieces; Attachments therefor  

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/ 10 • Earpieces; Attachments therefor  

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

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/ 14 • Throat mountings for microphones  

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/ 16 • Mounting or connecting stylus to transducer with or without damping means  

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/ 18 • • Holders for styli; Mounting holders on transducers  

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/ 20 • Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purposes H 04 R 5/00)  

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/ 22 • • for obtaining desired frequency characteristic only (circuits for combining transducers having different responses H 04 R 3/00)  

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

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

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/ 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  

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/ 30 • • • Combinations of transducers with horns, e.g. with mechanical matching means (horns in general G 10 K)  

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/ 32 • • for obtaining desired directional characteristic only  

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

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

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

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/ 40 • • • by combining a number of identical transducers  

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

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

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/ 46 • Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H 04 R 1/14)  
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