US2336828A - Portable microphone and amplifier - Google Patents
Portable microphone and amplifier Download PDFInfo
- Publication number
- US2336828A US2336828A US378328A US37832841A US2336828A US 2336828 A US2336828 A US 2336828A US 378328 A US378328 A US 378328A US 37832841 A US37832841 A US 37832841A US 2336828 A US2336828 A US 2336828A
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- US
- United States
- Prior art keywords
- amplifier
- casing
- microphone
- diaphragm
- tubes
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/04—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception comprising pocket amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
Definitions
- This invention relates to telephony and relates more particularly to combined microphones and amplifiers Of a compact type which renders them' suitable for use in hearing aid devices and other small portable telephone systems.
- the microphone is of the crystaltype and is combined with a vacuum-tube type of amplifier which includes tubes of such size that they may be disposed in the same casing with the microphone together with the necessary transformers, choke condenser and the like, to mal re a completely self-contained construction which may be readily carried in the pocket or suspended by a clip from, for example, the vest or coat of the individual using the same.
- a vacuum-tube type of amplifier which includes tubes of such size that they may be disposed in the same casing with the microphone together with the necessary transformers, choke condenser and the like, to mal re a completely self-contained construction which may be readily carried in the pocket or suspended by a clip from, for example, the vest or coat of the individual using the same.
- the device in accordance with the invention, is substantially the same in size as the conventional microphone alone that is used with such hearing aid devices, and therefore, is no more conspicuous or unwieldly than such conventional microphones, and at the same time, ha a gain which is far greater than that of the so-called mechanical amplifiers which are commonly used with portable hearing aid devices.
- Fig. 1 is a view in front elevation of a typical form of the microphone amplifier embodying the invention
- Fig. 2 is a view in front elevation of the device in Fig. 1, shown with the front section of the casing thereof removed;
- Fig. 3 is a view in section of the device taken on line 3-3 of Fig. 2;
- Figs. 4 and 5 are a diagrammatic showing of typical amplifier circuits used in the device.
- the preferred form of the device is provided with a fiat generally tear-drop shape of casing II] which is provided with a grille opening I l in front of the microphone diaphragm l2, best shown in Fig. 1.
- the casing I0 is preferably formed in two parts, the front section l3 of which is removable in order to expose the microphone and the various elements forming the amplifier for the device.
- the microphone diaphragm H which is of the conical type is mounted in the upper center of the casing and, as shown in Fig. 3,
- the center of the diaphragm i2 is connected to one corner of the crystal 16 which is fixed to the back casingsection l5, so that upon vibration of the diaphragm in response to voice waves, the crystal will be subjected to a twisting movement which causes the generation of a signal voltage.
- the two tubes H and I8 of the amplifier which are of thenew small peanut type, and in the preferred form of the. invention may be the CK501 and CK503 pentode tubes, are also mounted in thecasing section 15 and are disposed partially behind the edge of the microphone diaphragm I2 in order to conserve space.
- the tubes l1 and I8 are retained in the casing by means of small C-shaped clips l9 and 20 which may be secured to the section 15 in any desired way, such as, for example, by screws 2
- also support a combined switch and rheostat element 22 which consists essentially of a strip of insulating material 23 having a resistance coil 24 with which a slider 25 may be brought into engagement.
- the slider has two resilient fingers 21 and 26, the former engaging the coil 24 and the latter engaging a metallic strip 28 mounted behind the coil 24 to complete the circuit between the batteries, not shown, and
- the slider 25 is terial on which are mounted a choke coil 32 and a transformer 33, these elements being connected by suitable wiring to the remainder of the elements, as will be presently described.
- the supporting plate 3! is detachably connected to the casing section l5 to facilitate assembly and repair, if required.
- the section I5 is also provided with a plurality of jack sockets 34 which are suitably connected in the circuit so that the batteries and the receiver may be readily connected to and disconnected from the microphone and amplifier. 1
- amplifier circuits Any suitable type of amplifier circuit may be used in the device and I have found that the circuits disclosed in Figs. 4 and 5 are entirely satisfactory.
- the amplifier circuits may, as
- Figs. 4 and 5 be of the impedance coupled type in which the microphone crystal I6 is connected between the filament 35 and the grid 36 of the tube IT.
- is fed to the choke. or impedance 32 and through a biocking condenser 31 to the grid 38 of the tube IS.
- the plate 39 of the tube I8 is coupled through the transformer 33 to th receiver 40 which is shown diagrammatically.
- the circuit disclosed in Fig. 5 differs from that disclosed in Fig. 4 in that it includes a condenser 4
- the voltage output of the amplifiers is controlled by means of the combined switch and rheostat Or voltage control 22 which by variation in the amount of the resistance interposed in the filament circuit of the tubes l1 and I8 varies the filament voltage supplied to the tubes l1 and l 8.
- the device preferably is provided with some I means for attaching it to the vest Lorr coat of the user, such as, for example, the spring urged clip element 42 which is fixed to the back of the casing section l5, thereby permitting it to be suspended, for example, from "the vest pocket or outer coat pocket of the wearer.
- the device permits the frequency response of the'microphone andthe receiver to be varied to produce'the most suitable frequencies to complement the defective hearing of the user and,
- a portable microphone and amplifier for hearing aid devices comprising a casing having a grille adjacent one end thereof, means for suspending the casing from the clothing of the user,
- a crystal microphone secured to the back of said casing having a diaphragm disposed within said casing behind said grille, an impedance coupled amplifier including miniature vacuum tubes, a transformer and a choke within said casing, means for securing said tubes at least in part behind said diaphragm, a series of jacket sockets in another end of said casing, a sub-panel extending from adjacent to said jack sockets to adjacent the diaphragm, said sub-panel supportsaid choke, a combined switch and volume control in said one end of said casing and a circuit connecting said microphone, amplifier, jack sockets and switch and volume control, whereby said microphone and amplifier may be connected to an independently supported source of electrical energy anda receiver.
- Aportable microphone and amplifier unit for hearing aid devices comprising a casing of relatively fiat form adapted to be worn by a user
- said casing having a back with means thereon for attaching the casing to the user's clothing, a microphone located within the casing and including a conical diaphragm facing toward the front of the 'casing, vacuum tubes located in said casing and disposed adjacent the marginal portions of said diaphragm and between said portions and the back of the casing, a sub-panel located in said casing beside said diaphragm and parallel to the back thereof and supporting a, choke coil and transformer and means on said casing for electrically connecting said sub-panel and the elements supported thereby to an independently supported source of energy and a. receiver.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Description
' Dec. 14, 1943. w, A, ZARTH 2,336,828
PORTABLE MICROPHONE AND AMPLIFIER Filed Feb. 11,1941 2 Sheets-Sheet 1 INVENTOR William H. 207/};
ATTORNEY Dec. 14, 1943. w. A. ZARTH 2,336,828
PORTABLE MICROPHONE AND AMPLIFIER Filed Feb. 11, 1941 2 sheets-sheet 2 INVENTOR I imam A. 2477/11 Patented Dec. 14, 1 943 PORTABLE MICROPHONE AMPLIFIER William A. Zarth, East Orange, N. J., assignor to Dictograph Products Company, Inc.,'
New
York, N. Y.', a corporation of Delaware Application February 11, 1941, Serial No. 378,328 7 '21 Claims.
This invention relates to telephony and relates more particularly to combined microphones and amplifiers Of a compact type which renders them' suitable for use in hearing aid devices and other small portable telephone systems.
In accordance with the invention, I have provided a small self-contained microphone and amplifier system which may be readily carried about from place to place and, in conjunction with a suitable pocket size power supply and receivers is particularly useful in hearing aid systems.
Preferably, the microphone is of the crystaltype and is combined with a vacuum-tube type of amplifier which includes tubes of such size that they may be disposed in the same casing with the microphone together with the necessary transformers, choke condenser and the like, to mal re a completely self-contained construction which may be readily carried in the pocket or suspended by a clip from, for example, the vest or coat of the individual using the same.
The device, in accordance with the invention, is substantially the same in size as the conventional microphone alone that is used with such hearing aid devices, and therefore, is no more conspicuous or unwieldly than such conventional microphones, and at the same time, ha a gain which is far greater than that of the so-called mechanical amplifiers which are commonly used with portable hearing aid devices.
For a better understanding of the present invention, reference may be had to the accompanying drawings in which:
Fig. 1 is a view in front elevation of a typical form of the microphone amplifier embodying the invention;
Fig. 2 is a view in front elevation of the device in Fig. 1, shown with the front section of the casing thereof removed;
Fig. 3 is a view in section of the device taken on line 3-3 of Fig. 2; and
Figs. 4 and 5 are a diagrammatic showing of typical amplifier circuits used in the device.
As best shown in Fig. 1, the preferred form of the device is provided with a fiat generally tear-drop shape of casing II] which is provided with a grille opening I l in front of the microphone diaphragm l2, best shown in Fig. 1. The casing I0 is preferably formed in two parts, the front section l3 of which is removable in order to expose the microphone and the various elements forming the amplifier for the device.
As shown. in Fig. 2, the microphone diaphragm H which is of the conical type is mounted in the upper center of the casing and, as shown in Fig. 3,
has its edge supported by suitable brackets Mon the back section of the casing l5.
The center of the diaphragm i2 is connected to one corner of the crystal 16 which is fixed to the back casingsection l5, so that upon vibration of the diaphragm in response to voice waves, the crystal will be subjected to a twisting movement which causes the generation of a signal voltage. I I
The two tubes H and I8 of the amplifier which are of thenew small peanut type, and in the preferred form of the. invention may be the CK501 and CK503 pentode tubes, are also mounted in thecasing section 15 and are disposed partially behind the edge of the microphone diaphragm I2 in order to conserve space. The tubes l1 and I8are retained in the casing by means of small C-shaped clips l9 and 20 which may be secured to the section 15 in any desired way, such as, for example, by screws 2|.
The screws 2| also support a combined switch and rheostat element 22 which consists essentially of a strip of insulating material 23 having a resistance coil 24 with which a slider 25 may be brought into engagement. The slider has two resilient fingers 21 and 26, the former engaging the coil 24 and the latter engaging a metallic strip 28 mounted behind the coil 24 to complete the circuit between the batteries, not shown, and
the remainder of the circuit. The slider 25 is terial on which are mounted a choke coil 32 and a transformer 33, these elements being connected by suitable wiring to the remainder of the elements, as will be presently described.
The supporting plate 3! is detachably connected to the casing section l5 to facilitate assembly and repair, if required. The section I5 is also provided with a plurality of jack sockets 34 which are suitably connected in the circuit so that the batteries and the receiver may be readily connected to and disconnected from the microphone and amplifier. 1
Any suitable type of amplifier circuit may be used in the device and I have found that the circuits disclosed in Figs. 4 and 5 are entirely satisfactory. The amplifier circuits may, as
shown in Figs. 4 and 5, be of the impedance coupled type in which the microphone crystal I6 is connected between the filament 35 and the grid 36 of the tube IT. The output from the plate 3| is fed to the choke. or impedance 32 and through a biocking condenser 31 to the grid 38 of the tube IS. The plate 39 of the tube I8 is coupled through the transformer 33 to th receiver 40 which is shown diagrammatically.
The circuit disclosed in Fig. 5 differs from that disclosed in Fig. 4 in that it includes a condenser 4| which is connected in parallel with the choke 32 to permit tuning of the circuit and the elimi ination of unwanted frequencies.
' The voltage output of the amplifiers is controlled by means of the combined switch and rheostat Or voltage control 22 which by variation in the amount of the resistance interposed in the filament circuit of the tubes l1 and I8 varies the filament voltage supplied to the tubes l1 and l 8.
The device preferably is provided with some I means for attaching it to the vest Lorr coat of the user, such as, for example, the spring urged clip element 42 which is fixed to the back of the casing section l5, thereby permitting it to be suspended, for example, from "the vest pocket or outer coat pocket of the wearer.
From the foregoing description of a typical vform of combined microphone and vacuum tube amplifier it will be apparent that I hav provided an efiicient yet extremely compact construetion which eliminates the need of a separate amplifier system.
The device permits the frequency response of the'microphone andthe receiver to be varied to produce'the most suitable frequencies to complement the defective hearing of the user and,
7 ing said transformer and be used in such circuits with equal facility, so long as the device is of a compact natur and is readily portable. Therefore, the form of the invention described above should be considered as illustrative and not as limiting the scope of the following claims. I
I claim:
1. A portable microphone and amplifier for hearing aid devices comprising a casing having a grille adjacent one end thereof, means for suspending the casing from the clothing of the user,
a crystal microphone secured to the back of said casing having a diaphragm disposed within said casing behind said grille, an impedance coupled amplifier including miniature vacuum tubes, a transformer and a choke within said casing, means for securing said tubes at least in part behind said diaphragm, a series of jacket sockets in another end of said casing, a sub-panel extending from adjacent to said jack sockets to adjacent the diaphragm, said sub-panel supportsaid choke, a combined switch and volume control in said one end of said casing and a circuit connecting said microphone, amplifier, jack sockets and switch and volume control, whereby said microphone and amplifier may be connected to an independently supported source of electrical energy anda receiver.
2. Aportable microphone and amplifier unit for hearing aid devices comprising a casing of relatively fiat form adapted to be worn by a user,
said casing having a back with means thereon for attaching the casing to the user's clothing, a microphone located within the casing and including a conical diaphragm facing toward the front of the 'casing, vacuum tubes located in said casing and disposed adjacent the marginal portions of said diaphragm and between said portions and the back of the casing, a sub-panel located in said casing beside said diaphragm and parallel to the back thereof and supporting a, choke coil and transformer and means on said casing for electrically connecting said sub-panel and the elements supported thereby to an independently supported source of energy and a. receiver.
. W. A. ZARTH.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US378328A US2336828A (en) | 1941-02-11 | 1941-02-11 | Portable microphone and amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US378328A US2336828A (en) | 1941-02-11 | 1941-02-11 | Portable microphone and amplifier |
Publications (1)
Publication Number | Publication Date |
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US2336828A true US2336828A (en) | 1943-12-14 |
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ID=23492686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US378328A Expired - Lifetime US2336828A (en) | 1941-02-11 | 1941-02-11 | Portable microphone and amplifier |
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2500301A (en) * | 1945-12-21 | 1950-03-14 | Paraphone Hearing Aid Inc | Molded chassis for hearing aid apparatus |
US2505551A (en) * | 1945-04-19 | 1950-04-25 | Zenith Radio Corp | Hearing and casing and guard |
US2530621A (en) * | 1947-05-26 | 1950-11-21 | E A Myers & Sons | Wearable hearing aid with inductive pick-up for telephone reception |
US2568167A (en) * | 1946-02-28 | 1951-09-18 | Zenith Radio Corp | Vibration-damping electromagnetic coupling unit for sound-amplifying apparatus |
US2585191A (en) * | 1947-07-21 | 1952-02-12 | Paravox Inc | Hearing aid apparatus having sectional casing |
US2761018A (en) * | 1949-03-02 | 1956-08-28 | Paravox Inc | Hearing aid having a molded chassis |
USD408414S (en) * | 1998-05-01 | 1999-04-20 | Labtec, Inc. | Microphone grille |
USD737253S1 (en) * | 2014-08-13 | 2015-08-25 | Clifford Allan Henricksen | Microphone with elastomeric support |
USD760204S1 (en) * | 2015-01-05 | 2016-06-28 | Gibson Brands, Inc. | Microphone |
USD760203S1 (en) * | 2015-01-05 | 2016-06-28 | Gibson Brands, Inc. | Microphone |
USD760704S1 (en) * | 2015-01-05 | 2016-07-05 | Gibson Brands, Inc. | Microphone |
USD790510S1 (en) * | 2015-11-04 | 2017-06-27 | Bankers Pen (1991) Inc. | Portable speaker |
USD973611S1 (en) * | 2020-07-09 | 2022-12-27 | Loose Cannon Systems, Inc. | Portable communication device |
-
1941
- 1941-02-11 US US378328A patent/US2336828A/en not_active Expired - Lifetime
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2505551A (en) * | 1945-04-19 | 1950-04-25 | Zenith Radio Corp | Hearing and casing and guard |
US2500301A (en) * | 1945-12-21 | 1950-03-14 | Paraphone Hearing Aid Inc | Molded chassis for hearing aid apparatus |
US2568167A (en) * | 1946-02-28 | 1951-09-18 | Zenith Radio Corp | Vibration-damping electromagnetic coupling unit for sound-amplifying apparatus |
US2530621A (en) * | 1947-05-26 | 1950-11-21 | E A Myers & Sons | Wearable hearing aid with inductive pick-up for telephone reception |
US2585191A (en) * | 1947-07-21 | 1952-02-12 | Paravox Inc | Hearing aid apparatus having sectional casing |
US2761018A (en) * | 1949-03-02 | 1956-08-28 | Paravox Inc | Hearing aid having a molded chassis |
USD408414S (en) * | 1998-05-01 | 1999-04-20 | Labtec, Inc. | Microphone grille |
USD737253S1 (en) * | 2014-08-13 | 2015-08-25 | Clifford Allan Henricksen | Microphone with elastomeric support |
USD760204S1 (en) * | 2015-01-05 | 2016-06-28 | Gibson Brands, Inc. | Microphone |
USD760203S1 (en) * | 2015-01-05 | 2016-06-28 | Gibson Brands, Inc. | Microphone |
USD760704S1 (en) * | 2015-01-05 | 2016-07-05 | Gibson Brands, Inc. | Microphone |
USD790510S1 (en) * | 2015-11-04 | 2017-06-27 | Bankers Pen (1991) Inc. | Portable speaker |
USD973611S1 (en) * | 2020-07-09 | 2022-12-27 | Loose Cannon Systems, Inc. | Portable communication device |
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