TW466883B - An electroacoustic communications unit - Google Patents

Abstract

An electroacoustic communications unit with a receiver transducer in a housing. The communications unit has acoustic connections both from the front side of the diaphragm of the transducer and from its rear side to the area inwardly of the face of the unit for engagement with a user's ear as well as to the area outwardly of this engagement face. These four acoustic connections constitute the four branches of an acoustic balance bridge with the transducer as a generator. This configuration is particularly expedient, as it is hereby possible to reduce the inner air volume in the communications unit behind the diaphragm of the transducer to a size which is without importance for the size of the telephone in practice. Furthermore, variations in the degree of tightness of the engagement of the communications unit with the user's ear will only influence the frequency characteristic to a very limited degree.

Description

8 B 3 A7

_The present invention relates to an electric sound source, such as a mobile phone and a telephone handset, to maintain a connection with the ears of the user; it can also be a head-mounted ... especially in the field of mobile phones, the direction of its development, It's moving towards weight, less and more money. This is a great challenge for the producers and manufacturers of electronic and electro-acoustic components. ’They must integrate the microphone f and the sound generator barrel transducer together. Similarly, these transducers are also touched today-made in the past for size. The earphone electro-acoustic transducer used here has a thin film to generate a sound in the form of sound, which is on the audio side _ sound 詋 号 ^ This transducer is typically installed inside the phone casing -Band, there are some open-shaped sound communication channels, the shape of which has been carefully adjusted so that when it is connected with the user's ear, it can give the correct sound impedance and frequency conversion. Miscellaneous, sharp at the front makes a sound. In order for the flbUm to operate satisfactorily, the air chamber 'behind the film must have a fixed size, otherwise the film will get stuck and cannot vibrate. The gas money behind the film is too small, which will reduce the sensitivity of the transducer and cause its frequency characteristics to have a bad shape of f depressions. Therefore, printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Up to now, the reduction of mobile phones and telephone handsets must be equipped with this kind of health, and this size has become a limitation for designers and manufacturers. * Mobile phones and cell phones are thin-ear simulators to test their sound quality. This simulator is standardized, for example according to ffiC 318, IEC 711, or related standards. All of these standards are in accordance with the standard used in this paper. The paper standards are applicable to the Chinese National Standard (CNS) A4 (210 X 297 public love) _ 4-'^ 6 88 3' ^ 6 88 3 Print A7 I ------- B7___ V. Description of the invention (2.) |; Brother as the benchmark ', that is, the situation where the user leans the telephone or mobile phone on the ears is the grave standard. In order to ensure that their measurements are reproducible, these standards are based on a mechanical construction guide for financial training simulators, money sound effects editors, and a description of how to perform the test—including how Connect the phone to the ear simulator, especially the precise location and orientation of the phone simulator with respect to the county. This means that for any phone, and on a standard wire basis, we can define the fit between the phone and the ear simulator in a standardized test. According to the standard, ‘this saki will be together with the material. Therefore, the words "faces that fit the user's ears" in the following paragraphs, and the fitting surface of the communication unit and a standard material n are considered synonymous, because according to the foregoing, these faces are Are exactly the same. These types of standardized ear-dummy simulators' are all commercially available, such as models 4157, 4185, and 4195f! Made by Briiel & The typical mating surface is a circular area with a diameter of 25 (_), so the ear simulator has a ring-shaped mating surface with a diameter of 25 (_). An air chamber equal to the space of a human outer ear is provided on the inner side of the annular fitting surface of the ear strip wedge. This space is an entrance to the ear picking simulator, drunk cake, and Wei Wei. Ear Simulator (The size of the air chamber that the sound cuts will basically affect the earpiece of the communication sheet 70. Any sound loss around the sound can make this space increase to a considerable size. The sound load produces a noticeable change. The change in the sound load will cause the measurement results and the sound characteristics of the communication unit that I really want to avoid. Do not avoid the national standard (CNS) A4 specification (2lbT) ^ 7i57

---------; '' Outfit! (Please read the precautions on the back before filling out this page) -ο- Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 466 88 3 A7 ----------- V. Description of Invention (3.) symbol.裉 According to the standard ’To measure the characteristics of the communication list correctly and repeatedly, a close fitting relationship must be established between the communication unit and the ring lion face of the ear simulator. In use, the degree of close contact between the communication unit and the user's ear is determined by a considerable amount of change, so that the sound has a more or less loss and spreads around. These changes will affect the sound load of the earpiece transducer, and may further change the sound characteristics of the communication unit specifically according to the sensitivity of this unit to the impedance of the sound load. These changes will be noticed by the user when the sound quality of the communication unit changes. And this is what we don't want to see. Of course, the communication unit must have the ability to endure the amount of sound loss, that is, for a unit that allows the user to perceive its sound quality, or to provide a measurement result of the ear simulator, these results must be at their maximum possible. Inside the Fanyuan 'has nothing to do with the unit's fit-whether it fits with the user's ear or with the ear simulator. Because mobile phones are getting smaller and smaller, using the aforementioned method, a phone with a very small inner air chamber cannot be made, and immediately has a difference in sound loss. This is because the requirement for the difference in sound loss is a transducer. There must be a passage to the air chamber behind the transducer. A typical size is several cubic centimeters (cm3). A very large inner air chamber is unacceptable, as this will increase the size of this unit ', but if a large air chamber is not used, its sound opening must go through a smaller inner air chamber The way to the outside air of the phone is established. At this time, the transducer must have a passage from a small inner air chamber to an infinitely large air chamber so that it can reach this paper size and apply the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ) -6-

466 883 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (4.) To a function that can endure sound consumption. The structure of this small inner air chamber will form a resonance circuit composed of the acoustic inductance of these sound openings and the sound capacitance of the small inner air chamber. This resonance circuit will produce a deep and strong depression in the frequency response of the phone. Unfortunately, this depression is in the middle of the useful sound frequency and is determined by the shape of the opening and the inner air chamber. EP 364 93S describes a telephone handset with a handset transducer, in which the film front end is connected to the user's ear through the sound opening on the mobile phone, and it also mentions that the film front end and the inner part of the mobile phone The cabins are linked together in sound effects. DE 2 815 051 and US 4 239 945 describe many different headsets, in which a sound channel is provided between the front and rear ends of the film. The aforementioned communication channel includes the space of the user's external ear. Wo 98 / Issue 4 describes a mobile phone in which, on the inside of the phone surface connected to the user's ear, there is an acoustical communication channel leading to the front end of the film 'and a ship's back-end sakiyin communication path. ny gives the phone the ability to endure the amount of sound loss. Electrically, the listening: transducer is placed at a position away from the connection with the user's ear. "" All existing structures mentioned on the noodle surface have the affected room, which is located behind the membrane in the shell. Guilinfari Communication Newsletter㈣, from _ to the fine phase, one of the two connected systems It is connected from the front of the film through sound communication channels. These communication channels include (please read the note on the back of the 颉 before filling out this page)! I subscribe, — I b— > 1 a ο.

This paper size is in accordance with China National Standard (CNS) A4 (210 >: 297 Gongchu) -7- /! 〇6 8 8 3 Printed by the Shelley Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs B7 V. Invention Description (5 .) The inner area of the flower-connecting surface 1 refers to the ear of the user, and the area including the outer surface of the fitting surface 1 refers to the surrounding air. The four sound links are composed of four branches in the sound balance bridge and a transducer that acts as a generator. After adding a fourth sound communication channel between the front end of the membrane of the transducer and the air outside the communication unit, it can be determined to use a small inner air chamber to build a unit that can withstand sound loss. Because „is the effect of the sound resonance circuit, most of it can be offset. The principle is: the loss generated when the ear is attached to the user will pass through the contact of the front end of the film, and the frequency response There is a depression in the medium, but this effect will generate a corresponding peak at the same frequency response through the contact channel at the back of the film. Most of this compensation effect has nothing to do with how much sound is consumed. A sound This is how the “balance bridge” is established. The depressions in the frequency response curve will vary from phone to phone. This is because the communication path to the outside air of the phone has tolerances ^ but the effect of the sound balance bridge However, it is because the change of the sound loss will cause changes on the two branches of the bridge. Here, because the sound from the bridge is included. The two branches of the circuit caused by the loss are on the same acoustic resonance circuit, so their frequency and amplitude changes will cancel each other out, so that the sound bridge is still in a balanced state. The structure of the rear end, the user's ear, and the surrounding air are all connected with sound, which has its advantages, because it can use this to reduce the inner air chamber behind the film of the internal transducer of the phone to a comparison (first Read the note f on the back and fill in this page) -------- ^ --------

Du printed by the Consumer and Intellectual Property Bureau of the Ministry of Economic Affairs -------- B7___ V. Description of the invention (6.) The actual size of the phone is insignificant. This small air cell will inevitably produce a rather strong resonance, that is, it will generate at a relatively narrow frequency range, a considerable amplitude change, as described in the detailed text. Changes in frequency and amplitude are offset by each other. In use, the closeness of the communication unit to the user's ear must change. For every user, this change is happening all the time, and there is a considerable change from one user to another. According to the present invention, these changes will only affect the money tree in a small range. .0 is the miscellaneous end and the back end, which are all connected to the degree of change in the tightness, and they are included in the sound bridge. Of the two branches. Therefore, with the present invention, it is possible to construct a communication unit that can tolerate sound loss and only contains a relatively small inner air chamber. , Mobile phones and telephone handsets' wires all contain a shell composed of two shell plates and assembled along its edges. The tightness of this combination varies to some degree ’, but it ’s quite difficult and expensive to get it all together. ㈣In the present invention, the sound communication channel between the rear end of the transducer film and the surrounding air can propose a consistent implementation for this combination, and even make an & mouth on one of the edges of the combined shell plate. Discontinuities. If there is any sound loss between the combined shells and plates at this point, this sound loss will constitute a part of the sound connection, and most of the changes in this sound loss can be done. Can be offset by the present invention β This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) 1 ~--9- --I ------- IX -pack- -(Precautions on the back of the cage drawing and filling in this book) Order and description will be made with reference to the diagram to illustrate a preferred configuration of the present invention, where: Figure 1 is a cross-sectional view of the communication unit of the present invention Figure 1 is a simplified equivalent diagram of the sound effect structure of Figure 1. Figure 2 is a schematic diagram showing the position of a relatively large earpiece transducer in the communication unit of the present invention, and Figure 4 is a schematic diagram. To indicate the position of a relatively small handset transducer in the communication unit of the present invention. Figure—shown is a cross-section of a mobile phone. It is provided with a housing made up of two failure plates, a front shell plate 10, and a rear shell plate 11. The breakout contains a printed circuit board 12, which already has some electronic components indicated by diagonal lines. An earpiece transducer 20 shown in a schematic diagram has been mounted on the inside of the front case plate 10-for example, using a double-sided tape 13 that allows sound to be tightly sealed. This transducer has a thin film 21 shown in a schematic diagram, the front end 22 and the rear end 23 of which already have coils mounted thereon. The thin film is in a magnetic field, and the coil is loaded in a known manner so that the thin film can transfer Electrical signals are converted into sound signals in a known manner. The front end 22 of the film, its inner side faces the front shell plate 10, and the rear end of the membrane faces the inside of the phone. Figure 1 shows a space c around the transducer 20 and behind the front shell plate 10. In FIG. 1, the 'ear simulator 30 is shown by a dashed line, and the phone here is a schematic diagram showing a standardized test position relative to the ear simulator. The telephone at this time is attached to the ear simulator via a fitting surface 33. This area defines a seal printed on the employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs / / 466 88 3 A7 factory __B7 ___ V. Description of the invention (8.) The area 31 inside the bonding surface 33 and the bonding surface 33 33 outer area 32. Therefore, these two areas are separated from each other. The first sound communication path 41 'is passed from the film front end 22 of the transducer to the area 31 inside the bonding surface 33. This first sound communication path 41 is the main sound communication path from the film 21 to the user's ear. Between the film front end 22 and the front shell plate 10, there is a small space designed to be as small as possible, so that this space and its acoustic impedance can provide a resonance frequency together. This frequency falls outside the operating frequency of the phone 'so it only provides a short transmission line to the user's ear' and it will not affect the sound quality. The second sound communication path 42 passes through the space C from the rear end 23 of the membrane of the transducer, and then passes into the area 31 inside the bonding surface 33. Therefore, the first and second sound communication paths 41 and 42 They are respectively connected to the front end 22 and the rear end 23 of the film through the area 31. This area 31 represents the entrance of the ear simulator 'and the earphone entrance of the user. The β phone has a third sound communication channel 43. The rear end 23 of the membrane of the transducer passes through the space C and then passes to the sticker. The area u outside the joint surface 33. In the type shown, the contact guide extends to an opening between the two shell plates of the phone, the front shell plate 10 and the rear shell plate 11, but it can also be made into one of the shells. Independent openings on the board. The fourth sound communication path 44 'connects the film front end 22 of the transducer and the area 32 outside the bonding surface 33 together. Like the first-linkage path 41, the fourth-linkage path 44 is designed so that it can fit the Zhongguanjia Standard (CNS) A4 specification (210 κ 297 mm) at the front end of the film. 11-(Please read the precautions on the back before filling in this page w -Xiang! --- One order ---- 11- 466 88 A7 Invention Note (9.) printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 22 And the small space between the front shell plate 1G, the resonance frequency of the symbiotic-bribery outside the frequency range of the phone. The transducer 20 shown in Figure 1 is a relatively small unit located in the phone = shell. -Side-that is asymmetric design. Its first- and second-contact channels are collectively installed on the phone's towel center. For large handset transducers' Although the rotation shown here is also very practical, it is unique This structure is particularly suitable for small-sized transducers, because with the different positions of the transducers in the casing, we get a lot of freedom, and as the riding instructions, this * transducer can also be used Arranged at a position offset from the bonding surface 33, and can even be arranged relative to the outside It is in an inclined position. 3 shown in Fig. 2 is an equivalent circuit diagram of the sound effect structure described in Fig. 1. The transducer 20 shown here has become a generator with an internal acoustic impedance RG. The resistance technique shown here is represented by a purely intelligent resistance. The four sound communication channels 41, 42, 43, 44 shown here, each of which are respectively controlled by the inductors LI, L2, L3, and L4. It is constructed and connected in series with resistors R1, R2, R3, and R4. These inductances represent the air quality in each sound communication channel, and the resistance represents the friction loss in the communication channel. In the bonding surface 33 内 丘In area 31, the user's ear has a load impedance for the telephone. In an equivalent circuit, this impedance is represented by the resistance RL. In this equivalent circuit diagram, it is located behind the front shell plate, The space C around the transducer 20 is represented by capacitance (^). As can be seen from Figure 2, the impedance representing these four sound communication channels is constituted by a light-on bridge with four branches. And use the energy converter 20 as a generator. This space c , Plus its sound communication channels 42 and 43_ especially ^ Paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm> -12- (Please read the note on the back before filling this page)

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V. Description of the invention (10-) Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and the Consumer Cooperative, which means that their inductances L2 and L3 constitute two resonant circuits. Among them, each resonance circuit is fed by the rear end 23 of the film, and in the equivalent diagram, it is connected to the sound load via its end respectively. Obviously, if the size of the sound communication channels 42 and 43 is appropriately changed so that they have substantially the same resonance frequency and resonance bandwidth, these resonance effects displayed on the sound load RL will cancel each other out. . As a result, its sound output signal is essentially independent of the space C in the phone. Taking the mobile phone as an example, this means that it no longer needs to have an internal sound effect space, to tolerate the situation of sound loss, so that remote communication units can be made even smaller: even smaller. Fig. 3 is a schematic view showing the inside of the casing 10 before a mobile phone. The mating surface 33 for the user's ear is drawn here with an inner diameter of 25 millimeters (mm). The earpiece transducer 20a 'having an outer diameter of 20 mm (stomach) is provided so as to be offset from the fitting surface 33. The first and first sound communication channels 41 and 42 shown are placed near the center of the station surface 33, but the fourth sound communication channel 44 is set outside the bonding surface, but is located at Within the transducer's peripheral elements. For classmates, Figure 4 also shows the interior of the shell 10 before a mobile phone with a schematic diagram, which has a same bonding surface 33 ′ with a diameter of 25 mm (mm), which is similar to the situation in Figure 3. The earpiece transducer 20b here is a smaller type with a diameter of 15 mm (mm), so it conforms to Figure 1. As in the case of FIG. 3, the first and second sound communication channels 41 and 42 shown are located near the center of the bonding surface 33, respectively. As is the case with the fourth sound communication channel 44, it is also facing outward from the bonding surface here, but it is a Chinese paper standard (CNS) A4 standard (210 > = 297 mm>). 13--ΙΪΙΙΙΙΙ — — · II it (please read the precautions on the back before filling in this page) i 丨 f Order ·! 466883 B7 V. Description of the invention (11.) It is located outside the peripheral components of the transducer. As in the case of FIG. 1, the communication channels connecting the front shell plate 10 to the opening are made into a recessed or low-smoke shape in the front shell plate 10, and the recesses extend on the double-sided adhesive tape 13 (Please read the notes on the back before filling in this page) J a 0Γ Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs's Consumer Cooperatives' paper size applies to Chinese National Standard (CNS) A4 (210 X 29 ^^ ali 4 6 6 bb 3 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the components of the invention (I2.) Symbol description C Air chamber RL Sound load impedance RG Transducer sound impedance R1 Sound element resistance R2 of the first sound link Two Voices Contact the Voice of the Road Element resistance R3 Sound element resistance of the third sound contact channel R4 Sound element resistance of the fourth sound contact channel L1 Sound element inductance of the first sound contact channel L2 Sound element inductance of the second sound contact channel L3 Third sound contact sound Element Inductance L4 Fourth Sound Contact Sound Element Inductor 10 Front Shell Plate 11 Rear Shell Plate 12 Printed Circuit Board 13 Tape 20 Earpiece Transducer 20a Earpiece Transducer 20b Earpiece Transducer 21 Transducer Film 22 Transducer Membrane front end 23 Transducer Membrane back end 30 Ear simulator 31 Inside area of the fitting surface of the ear simulator The paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -14-1-(谙 先Read the idea on the back of the book and fill in this page.) -------- Order it ----.— Record

(Please read the precautions on the back before filling in this purchase) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210X297 mm) -14-2-

Claims (1)

Bu Qu ft 4 6 83 ABCS Xiu Fang Zheng Ming Ben Wu member Wu Hu whether n.rf φ is allowed within the month 〇-¾. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs I :. Patent case No. 88117185 patent application #Scope of amendment 1. An electro-acoustic communication unit comprising-a casing with a shell plate (10, 11) for interposing the interior and exterior of the casing,-an electro-acoustic conversion energy The transducer (20) has a film (21) including a front end (22) and a rear end (23) and used to generate a sound signal. The aforementioned transducer (20) has a center and is mounted on a shell plate ( 10) the inner side, and the front end of the film (22) is facing the shell plate (10), and there are sound communication channels (41, 42, 43, 44) between the inner and outer sides of the shell, and On the sound communication channel, a point of contact (33) between a communication unit and the user's ear (30) is also defined, and its sound contact includes:-located in the inner area of the film front end (22) and the bonding surface (33) (31) The first sound communication channel (41, LI, R1),-located at the back of the film (23) and the second sound communication channel (42, L2, R2) between the 'internal area (.31) of the bonding surface (33),-located at the rear end (23) of the film and the bonding surface (33 The third sound communication channel (43, L3, R3) between the outer area (32) of) is characterized in that it has an outer area (32) located at the front end of the film (22) and the bonding surface (33). The fourth sound between them (44, L4, R4). 2. The electro-acoustic communication unit according to item 1 of the scope of the patent application, characterized in that the first, first, third, and fourth audio contacts form a paper which is inferior to the Chinese National Standard (CNS) ) A4 size (210 X 297 mm) -15 (Please read the business matters on the back before filling in this page) / t 一-^ ii ------- --- n! ^-. 46 6 88 3 A8B8C8D8 Six, the patent application scope has four branches of sound bridge. 3. According to the electroacoustic communication unit described in item 1 of the scope of the patent application, its characteristics (please read the precautions on the back before filling this page.) Are the-, second, third, and fourth audio communication channels The sound impedance (U, Rl; L2, R2; L3, R3; L4, R4) can work together to make the communication unit and the user's ear (30) fit together to achieve the desired frequency characteristics . 4. The electro-acoustic communication unit according to item 3 of the scope of the patent application, which is characterized in that its acoustic bone impedance can cooperate together so that its frequency characteristics are basically attached to the communication unit and the user's ear (30). The closeness of time is irrelevant. 5. The electro-acoustic communication unit according to item 丨 in the scope of the patent application, characterized in that the center of the energy transfer! § is offset from the plane of the shell plate (10) relative to the communication unit and the user's ear (30) The center position of the bonding surface (33). 6. The electro-acoustic communication unit according to item 丨 of the patent application park, characterized in that its casing has two shell plates (10, 11), which are assembled along the edge, and the third acoustic communication channel ( (43, L3, R3) are set on their edges. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 7. According to the electro-acoustic communication unit described in item 6 of the patent application park, it is characterized by the 'third acoustic communication channel (43, L3, R3) is composed of one of the shell plates (10, 11) constituted by discontinuities in the edges. 8. The electro-acoustic communication unit according to item 1 of the scope of the patent application is characterized in that the space (c) in the communication unit forms part of the second sound communication channel (42) and the third sound communication channel (43). 'Let the second voice communicate. The paper size applies the Chinese National Standard (CNS) A4 specification (21〇 >; 297 public love) -16- 4 ϊ 6 88 3 .Α8 Β8 C8 D8 6. Scope of patent application (42) And the third sound contact 遒 (43) is adjusted to have substantially the same resonance frequency and resonance bandwidth. (Please read the precautions on the back before filling this page) Order --------- line. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs ^ Zhang's degree of M is applicable to China National Standard (CNS) A4 Specification (210 X 297 mm) -17-