GB1519327A - Electromagnetic signal horns - Google Patents
Electromagnetic signal hornsInfo
- Publication number
- GB1519327A GB1519327A GB4159775A GB4159775A GB1519327A GB 1519327 A GB1519327 A GB 1519327A GB 4159775 A GB4159775 A GB 4159775A GB 4159775 A GB4159775 A GB 4159775A GB 1519327 A GB1519327 A GB 1519327A
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical receiver
- circuitry
- oct
- diaphragm
- light source
- Prior art date
- 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
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Electromagnets (AREA)
Abstract
1519327 Electromagnetic horns ROBERT BOSCH GmbH 10 Oct 1975 [12 Oct 1974] 41597/75 Heading G5J The vibration of a diaphragm 12 of an electromagnetic signal horn is controlled by a member 21 which extends into a light path 24 between a light source 22 and an optical receiver 23, to switch off the current to the excitation windings 16 of an electromagnet 15 on displacement of the armature 14 of the diaphragm 12. Preferably the switching is effected by thick-film circuitry 19 (Fig. 2, not shown) which comprises: an operational amplifier to boost the signal from an optical receiver in the form of a phototransistor, and a switching device, possibly a thyristor, but preferably a Darlington circuit suitably protected against transients, to supply the excitation windings. Suitable alternative circuitry may be provided if a photoresistor or photodiode is used as the optical receiver. A Zener diode/resistor voltage stabilizer may be used in connection with said circuitry, for use in motor vehicles. The light source may be an incandescent lamp but is preferably a L.E.D. The position of the optical arrangement is preferably adjustable by a screw 25.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742448679 DE2448679A1 (en) | 1974-10-12 | 1974-10-12 | ELECTROMAGNETIC SIGNAL HORN WITH CONTACTLESS CONTROLLED MEMBRANE MOVEMENT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1519327A true GB1519327A (en) | 1978-07-26 |
Family
ID=5928145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4159775A Expired GB1519327A (en) | 1974-10-12 | 1975-10-10 | Electromagnetic signal horns |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2448679A1 (en) |
| FR (1) | FR2287742A1 (en) |
| GB (1) | GB1519327A (en) |
| IT (1) | IT1043298B (en) |
-
1974
- 1974-10-12 DE DE19742448679 patent/DE2448679A1/en active Pending
-
1975
- 1975-10-02 FR FR7530253A patent/FR2287742A1/en not_active Withdrawn
- 1975-10-10 GB GB4159775A patent/GB1519327A/en not_active Expired
- 1975-10-10 IT IT2819275A patent/IT1043298B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1043298B (en) | 1980-02-20 |
| DE2448679A1 (en) | 1976-04-22 |
| FR2287742A1 (en) | 1976-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |