Speaker-installed device and speaker output control method

Abstract

The present invention provides a device and a method for executing output control in accordance with characteristics of each of speaker coils of a speaker-installed device. A data processing unit for controlling output to a speaker coil executes control to which a coil temperature - resistance value correlation function is applied, the function having as a parameter a reference resistance R0 at a reference temperature T0. The data processing unit detects a resistance value of a region identification element installed in the speaker-installed device, and executes control in which, on the basis of the detected resistance value, a value of the reference resistance R0, which is a parameter of the coil temperature - resistance value correlation function, is set to a value corresponding to characteristics of a speaker coil of the speaker-installed device.

Description

Speaker-equipped device and speaker output control method

[0001] The present disclosure relates to a speaker-equipped device and a speaker output control method, and more particularly to a speaker-equipped device and a speaker output control method that can prevent damage to a device equipped with a speaker, such as a smartphone, due to a rise in speaker temperature.

[0002] For example, many electronic devices, such as smartphones, tablets, game consoles, and cameras, have built-in small speakers.

[0003] In such electronic devices, for example, if the built-in speaker is used at high output for a long time, the coil that drives the speaker (speaker coil) will heat up due to the current flowing through it, which may melt the adhesive that secures the coil wire together and cause the coil wire to separate.In addition, the heat may propagate to the diaphragm, causing the diaphragm to deform.

[0004] For example, Patent Document 1 (JP 2004-112707 A) discloses a control configuration for preventing such damage to equipment. Specifically, it discloses a configuration in which a temperature sensor is installed near the speaker and the output current to the speaker coil is reduced when the temperature detected by the temperature sensor exceeds a specified value. This control prevents the speaker from excessively increasing in temperature, making it possible to avoid damage to the equipment.

[0005] However, this configuration requires that the temperature sensor be installed near the speaker and that the temperature sensor be required to continuously detect the temperature, which poses problems for small electronic devices such as smartphones, such as securing space for the temperature sensor and the power consumption of the temperature sensor.

[0006] As a configuration that does not use a temperature sensor, a speaker protection algorithm function is known that estimates the temperature of a speaker coil based on the resistance value of the speaker coil and controls the output current to the speaker coil based on the estimated temperature.

[0007] This is an algorithm that feeds back the output voltage and current values ​​of the amplifier connected to the speaker coil to the signal processing unit, calculates the resistance value of the speaker coil, estimates the coil temperature based on the calculated coil resistance value, and reduces the output current to the speaker coil when the estimated temperature reaches a specified temperature. By controlling the output current to the speaker coil according to this algorithm, it is possible to prevent the speaker coil from overheating.

[0008] For example, if control is performed to reduce the output to the speaker coil when the speaker coil reaches 90°C, the coil resistance value (x Ω (ohms)) at 90°C is calculated in advance. In the actual control stage, the resistance value of the speaker coil is monitored while audio is being output from the speaker, and if it is detected that the coil resistance value has reached the coil resistance value (x ohms) equivalent to 90°C, control is performed to reduce the output to the speaker coil.

[0009] However, a problem with this control algorithm is that the relationship between coil resistance and temperature is not uniform for all devices and varies from device to device. In other words, the resistance of the speaker coil when it reaches 90°C is not uniform but varies.

[0010] Therefore, when output control is performed based on a single coil resistance value, it is possible that in some speakers, output reduction processing will be performed at temperatures below 80° C., while in other speakers, control will not begin until the temperature reaches above 100° C. In this way, when output control is performed based on a single coil resistance value, excessive output reduction processing will be performed in some devices, and in other devices, the output reduction processing may not be performed in time, resulting in damage to the devices.

[0011] Japanese Patent Application Laid-Open No. 2004-112707

[0012] The present disclosure has been made in consideration of the above-mentioned problems, for example, and aims to provide a speaker-equipped device and a speaker output control method that can estimate the speaker coil temperature in speaker-equipped devices such as smartphones with higher accuracy for each device, thereby enabling accurate output control for each speaker.

[0013] A first aspect of the present disclosure resides in a speaker-equipped device comprising: a speaker module having a speaker and a coil for driving the speaker; and a data processing unit that controls an output current to the coil by applying a coil temperature-resistance correlation function that is a correlation equation between the temperature and resistance of the coil, wherein the data processing unit detects the resistance of an area identification element attached to the speaker-equipped device, determines parameters of the coil temperature-resistance correlation function based on the detected resistance of the area identification element, and controls the output current to the coil by applying the coil temperature-resistance correlation function with the determined parameters set.

[0014] Furthermore, a second aspect of the present disclosure is a speaker output control method executed in a speaker-equipped device, the speaker-equipped device comprising: a speaker module having a speaker and a coil that drives the speaker; and a data processing unit that controls an output current to the coil by applying a coil temperature-resistance correlation function that is a correlation equation between the temperature and resistance of the coil, wherein the data processing unit detects the resistance of an area identification element attached to the speaker-equipped device, determines parameters of the coil temperature-resistance correlation function based on the detected resistance of the area identification element, and controls the output current to the coil by applying the coil temperature-resistance correlation function with the determined parameters set.

[0015] Further objects, features, and advantages of the present disclosure will become apparent from the following detailed description of the embodiments of the present disclosure and the accompanying drawings. Note that in this specification, a system refers to a logical collective configuration of multiple devices, and is not limited to devices that are located within the same housing.

[0016] According to the configuration of one embodiment of the present disclosure, an apparatus and a method for performing output control according to the characteristics of each speaker coil of a speaker-equipped device are realized. Specifically, for example, a data processing unit that controls the output to the speaker coils may be configured to calculate a reference temperature T ０ Reference resistance R ０ The data processing unit detects the resistance value of the area identification element attached to the speaker-mounted device, and calculates a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, based on the detected resistance value. ０ The control is performed by setting the value of to a value corresponding to the characteristics of the speaker coil of the speaker-equipped device. With this configuration, an apparatus and method for performing output control corresponding to the characteristics of each speaker coil of the speaker-equipped device are realized. Note that the effects described in this specification are merely examples and are not limiting, and additional effects may also be provided.

[0017] FIG. 1 is a diagram illustrating a configuration example of a smartphone, which is an example of a speaker-equipped device according to the present disclosure; FIG. 2 is a diagram illustrating a detailed configuration example of a speaker module; FIG. 3 is a diagram illustrating a correspondence relationship between the temperature of a coil (speaker coil) and the resistance value of the coil; ０ and the reference resistance R ０ 1 is a diagram explaining an example of a distribution of "coil temperature-resistance value correlation data" for a large number of smartphones. 2 is a diagram explaining problems when performing control using one "coil temperature-resistance value correlation equation." 3 is a diagram explaining problems when performing control using one "coil temperature-resistance value correlation equation." 4 is a diagram explaining problems when performing control using one "coil temperature-resistance value correlation equation." 5 is a diagram explaining problems when performing control using one "coil temperature-resistance value correlation equation ０ Coil resistance value (= reference resistance R ０ ) and stores the measurement results in the memory of the smartphone. ０ Coil resistance value (= reference resistance R ０ ) and stores it in memory. ０ Coil resistance value (= reference resistance R ０) and storing the measured resistance value in memory. FIG. 1 is a diagram illustrating an example of a distribution of "coil temperature-resistance value correlation data" for a large number of smartphones. FIG. 2 is a diagram illustrating an example of a classification process for speaker modules into three divided regions. FIG. 3 is a diagram illustrating a process for attaching a region identification element (Rcls0) having different resistance values ​​according to the speaker module classification result. FIG. 4 is a diagram illustrating an example of a region division pattern for regions L, T, and U. FIG. 5 is a diagram illustrating a process for attaching a region identification element (Rcls0) having different resistance values ​​according to the speaker module classification result. FIG. 6 is a diagram illustrating an example of a detailed configuration of a speaker module attached inside a smartphone (speaker-equipped device). FIG. 7 is a diagram illustrating an example of a circuit configuration inside a smartphone (speaker-equipped device) of the present disclosure. FIG. 8 is a diagram illustrating data stored in a memory. FIG. 9 is a diagram illustrating an example of control corresponding to each region executed by a smartphone (speaker-equipped device) of the present disclosure. FIG. 10 is a diagram illustrating an example of control for starting an output reduction process for a speaker coil to prevent a temperature rise in the speaker coil. FIG. 11 is a diagram illustrating a manufacturing sequence for a speaker module. FIG. 12 is a diagram illustrating a flowchart for an audio output control sequence in a smartphone (speaker-equipped device). 1 is a diagram illustrating a flowchart for explaining an audio output control sequence in a smartphone (device equipped with a speaker). FIG. 2 is a diagram illustrating a flowchart for explaining an audio output control sequence in a smartphone (device equipped with a speaker). FIG. 3 is a diagram illustrating an example of the correlation between coil temperature and coil resistance value. FIG. 4 is a diagram illustrating a specific example of using a "coil temperature-resistance value correlation function" that differs between the high temperature side and the low temperature side. FIG. 5 is a diagram illustrating an example of switching control when using a "coil temperature-resistance value correlation function" that differs between the high temperature side and the low temperature side. FIG. 6 is a diagram illustrating an example of region division mode for regions L, T, and U. FIG. 7 is a diagram illustrating an example of attachment of a low temperature side region identification element (Rcls0). FIG. 8 is a diagram illustrating an example of attachment of a high temperature side region identification element (Rcls1). FIG. 9 is a diagram illustrating an example of the internal circuit configuration of a smartphone (device equipped with a speaker) of a second embodiment. FIG. 10 is a diagram illustrating data stored in memory. FIG. 11 is a diagram illustrating an example of control corresponding to each region.Fig. 1 is a diagram illustrating a flowchart for explaining an audio output control sequence in a smartphone (device equipped with a speaker). Fig. 2 is a diagram illustrating a flowchart for explaining an audio output control sequence in a smartphone (device equipped with a speaker). Fig. 3 is a diagram illustrating an example of the hardware configuration of a device equipped with a speaker such as a smartphone.

[0018] Hereinafter, the speaker-equipped device and the speaker output control method of the present disclosure will be described in detail with reference to the drawings. The description will be made in accordance with the following items: 1. Configuration example of the speaker-equipped device 2. Reference temperature T ０ Coil resistance value (= reference resistance R ０ ) and storing it in memory 3. Processing executed during manufacturing of a speaker-equipped device according to the present disclosure 4. Configuration example of a speaker-equipped device according to the present disclosure 5. Processing sequence according to the present disclosure 5-1. Manufacturing sequence of a speaker module 5-2. Audio output control sequence in a smartphone (speaker-equipped device) 6. Example of output control processing using different "coil temperature-resistance correlation functions" with multiple reference resistors corresponding to multiple reference temperatures set 7. Sequence of output control processing using different "coil temperature-resistance correlation functions" with multiple reference resistors corresponding to multiple reference temperatures set 8. Hardware configuration example of a speaker-equipped device according to the present disclosure 9. Summary of configuration according to the present disclosure

[0019] 1. Configuration Examples of Speaker-Equipped Devices First, configuration examples of speaker-equipped devices will be described.

[0020] FIG. 1 is a diagram illustrating an example of the configuration of a smartphone, which is an example of a speaker-equipped device according to the present disclosure.

[0021] Note that the speaker-equipped device of the present disclosure is not limited to a smartphone, but includes various electronic devices such as a tablet terminal, a PC, a game console, etc. In the following embodiment, a smartphone will be described as an example of the speaker-equipped device of the present disclosure.

[0022] As shown in FIG. 1, a smartphone (device equipped with a speaker) 10 includes a display module 11, a camera module 12, a speaker module 20, a speaker sound output hole 23, and the like.

[0023] The speaker module 20 has a configuration in which a speaker unit 22 is housed inside a speaker enclosure 21. Note that the configuration of the smartphone 10 shown in Fig. 1 is an example, and the position and size of the speaker module 20 differ depending on the model.

[0024] Fig. 2 shows a detailed configuration example of the speaker module 20. As described with reference to Fig. 1, the speaker module 20 has a configuration in which a speaker unit 22 is housed inside a speaker enclosure 21. As shown in Fig. 2, the speaker unit 22 has a diaphragm 31 and a coil (speaker coil) 32, and power is supplied to the coil 32 via a coil power supply unit 33. This power supply drives the diaphragm 31, and audio output processing is performed.

[0025] However, when speaker unit 22 having such a configuration is used at high output for a long period of time, the coil portion may heat up due to the current flowing through coil 32, causing the adhesive that secures coil 32 together to melt and resulting in the coil 32 coming apart. Also, the heat may propagate to diaphragm 31, causing deformation of the diaphragm.

[0026] As explained above, one configuration for preventing damage to equipment due to heat generated by the coil 32 is a speaker protection algorithm function that measures the resistance value of the coil 32, estimates the temperature of the coil 32 based on the measured coil resistance value, and controls the output current to the coil 32 based on the estimated temperature.

[0027] Specifically, as described above, this algorithm feeds back to the signal processing unit the output voltage value and current value of the amplifier connected to the coil power supply unit 33 of the coil 32, calculates the resistance value of the coil 32, estimates the coil temperature based on the calculated coil resistance value, and when the estimated temperature reaches a specified temperature, reduces the output current to the coil 32. By controlling the output current to the coil 32 in accordance with this algorithm, it is possible to prevent the temperature of the coil 32 from rising excessively.

[0028] The correspondence relationship between the temperature of the coil (speaker coil) and the resistance value of the coil will be described with reference to Figure 3. Figure 3 is a graph with the temperature (T (°C)) of the coil (speaker coil) on the horizontal axis and the resistance (R (ohms (Ω))) of the coil (speaker coil) on the vertical axis. The solid line shown in the graph is data showing the correspondence relationship between the coil temperature and the coil resistance value, i.e., coil temperature-resistance value correlation data.

[0029] As can be seen from the graph, as the coil temperature rises, the coil resistance also increases. The temperature Ts shown on the horizontal axis of the graph in Figure 3 is an example of an output control start temperature (90°C). That is, this is an example of a control start temperature setting when control is performed to start processing to reduce the speaker coil output in order to prevent the speaker coil temperature from rising again when the speaker coil temperature reaches 90°C.

[0030] When such control is performed without using a temperature sensor, it is possible to perform control based on the resistance value of the speaker coil. As can be seen from the coil temperature-resistance value correlation data shown in the graph, the coil resistance value R at a coil temperature T (°C) = 90°C is R = 7.7 (ohms (Ω)). Therefore, if control is performed to reduce the output to the speaker coil when the coil resistance value R rises to R = 7.7 (ohms (Ω)), it becomes possible to suppress the temperature rise of the speaker coil. In other words, it becomes possible to perform control to maintain the temperature of the speaker coil at 90°C or below.

[0031] However, this control algorithm is based on the premise that the relationship between coil resistance and temperature is the same for all devices. In reality, however, the relationship between coil resistance and temperature is not uniform and varies from device to device. In other words, the resistance of the speaker coil when it reaches 90°C is not uniform but varies among smartphones equipped with speakers.

[0032] Therefore, when output control is performed based on a single coil resistance value, it is possible that in some speakers, output reduction processing will be performed at temperatures below 80° C., while in other speakers, control will not begin until the temperature reaches above 100° C. In this way, when output control is performed based on a single coil resistance value, there is a problem in that excessive output reduction processing will be performed in some devices, and in other devices, the output reduction processing will not be performed in time, resulting in damage to the devices.

[0033] As mentioned above, the solid line shown in the graph in Figure 3 is the "coil temperature-resistance value correlation data" that shows the correspondence between coil temperature and coil resistance value, but this is average data, and the "coil temperature-resistance value correlation data" for each smartphone, which is a speaker-equipped device, will be different data.

[0034] The solid line shown in the graph of Figure 3, i.e., the correspondence relationship between the temperature of the coil (speaker coil) and the resistance value of the coil, is shown below as (Equation 1). The following (Equation 1) is a formula for calculating the coil temperature T (°C) when the coil resistance value is R (ohms (Ω)).

[0035]

[0036] In the above formula (1), T ０ :Reference temperature R ０ :Reference temperature T ０ where α is a coil material parameter that is a fixed value depending on the coil material.

[0037] Referring to FIG. 4, the reference temperature T ０ and the reference resistance R ０ This article explains:

[0038] Reference temperature T ０ is a temperature that can be set arbitrarily. In the example shown in FIG. ０ = 25°C. Reference resistance R ０ is the reference temperature T ０ is the coil resistance value at , and is an actually measured value. Note that α is a fixed value according to the coil material, and if the coil is made of copper wire, for example, a coil material parameter α corresponding to copper is used.

[0039] In this way, the reference temperature T ０ and the reference resistance R ０ The "coil temperature-resistance correlation equation" shown in (Equation 1) above is generated using the coil material parameter α. However, the reference temperature T ０ The reference resistance R is the coil resistance value at ０ is not necessarily the same value for all smartphones.

[0040] During the manufacturing stage of the speaker unit or the smartphone, assembly errors of the components that make up each speaker or smartphone are unavoidable, and there are also individual differences in the amount of adhesive applied to the coil and the application configuration. ０ The reference resistance R is the coil resistance value at ０ As a result, the solid lines shown in the graphs of Figures 3 and 4, i.e., the "coil temperature-resistance value correlation data," also differ for each smartphone.

[0041] 5 is a diagram showing an example of the distribution of "coil temperature-resistance value correlation data" for a large number of smartphones. The "coil temperature-resistance value correlation data" for a large number of smartphones is distributed within the width of the "coil temperature-resistance value correlation data distribution area" shown as a gray area in FIG.

[0042] That is, when there are many smartphones that are speaker-equipped devices, the reference temperature T ０ = The coil resistance value (= reference resistance) at 25°C is R ０ min~R ０ The values ​​are distributed between max and min.

[0043] The previously explained (Equation 1) corresponds to only one solid line set at the center of the "coil temperature-resistance value correlation data distribution area" shown as a gray area in Figure 5, and problems will arise if control using the above (Equation 1) is performed on all smartphones.

[0044] A specific example will be described with reference to Fig. 6. The output control start temperature (90°C) is indicated by Ts on the horizontal axis of the graph in Fig. 6. That is, when the temperature of the speaker coil reaches 90°C, control is performed to start processing to reduce the output of the speaker coil in order to prevent the temperature of the speaker coil from rising.

[0045] This control is performed using the above (Equation 1). The above (Equation 1) corresponds to a single solid line set at the center of the "coil temperature-resistance value correlation data distribution area" shown as a gray area in FIG. 6. In this relational expression, the coil resistance value R at a coil temperature T (°C) of 90°C is R = 7.7 (ohms (Ω)). Therefore, when control is performed according to the above (Equation 1), if it is detected that the coil resistance value R has reached R = 7.7 (ohms (Ω)) during output to the speaker, control to reduce the output to the speaker coil will be initiated.

[0046] If control is exercised to reduce the output to the speaker coil when the coil resistance value R rises to R = 7.7 (ohms (Ω)), it should be possible to suppress the temperature rise of the speaker coil and control the speaker coil to maintain its temperature below 90°C.

[0047] However, if control is performed to reduce the output to the speaker coil when the coil resistance value R rises to R = 7.7 (ohms (Ω)), as can be seen from Figure 6, the control start temperature for speaker x will be 80°C, while the control start temperature for speaker y will be 108°C.

[0048] In this way, when output control is performed based on one coil resistance value, i.e., one relational expression, in some devices, excessive output reduction processing may be performed at low temperatures below the original control start temperature (e.g., 90°C), and in other devices, output reduction processing may not be performed at the original control start temperature (e.g., 90°C), which may result in damage to the device.

[0049] [2. Set the reference temperature T for each smartphone ０ Coil resistance value (= reference resistance R ０ Next, for each smartphone, the reference temperature T ０ Coil resistance value (= reference resistance R ０ ) and store it in memory will be described.

[0050] As a method for solving the above problem, an example of a conventional process will be described with reference to FIG. ０ Coil resistance value (= reference resistance R ０ ) is not uniform, that is, the reference temperature T ０ Coil resistance value (= reference resistance R ０ ) is different.

[0051] Therefore, as shown in Figure 7, the reference temperature T ０ Coil resistance value (= reference resistance R ０ ) is measured, and the reference resistance R ０ The value of (for example, R ０ min~R ０ The value (max range) is stored in the smartphone's memory.

[0052] The control unit (data processing unit) of each smartphone uses the reference temperature T stored in the memory when actually driving the speaker. ０ Reference resistance R ０ The value of is acquired, and this acquired value is substituted into the previously explained (Equation 1) to execute the control.

[0053] By performing this type of processing, control is achieved that utilizes the characteristics of each smartphone, i.e., the "coil temperature-resistance value correlation data" specific to each speaker, enabling highly accurate control, i.e., output reduction processing at the original control start temperature (e.g., 90°C).

[0054] In this way, the reference temperature T ０ Coil resistance value (= reference resistance R ０ ) is measured, and the reference resistance R ０ The value of (for example, R ０ min~R ０ The processing configuration for storing the range of values ​​(max) in the memory of the smartphone will be described with reference to FIG. 8.

[0055] 8 shows the smartphone 10, an inspection system 41, and a thermometer 42. Inside the smartphone 10, the speaker module 20, a data processing IC 51, and an amplifier IC 52 are shown.

[0056] The inspection system 41 monitors the temperature of the thermometer 42 and controls the temperature of the space in which the smartphone 10 is placed to a reference temperature (e.g., 25°C), and at this reference temperature, outputs a control signal to the data processing IC 51 of the smartphone 10 and outputs a test signal to the speaker module 20 via the amplifier IC 52.

[0057] The test system 41 calculates the resistance value of the coil (speaker coil) of the speaker module 20 based on the output voltage and output current from the amplifier IC 52 when the test signal is output. ０ (= 25°C) Coil resistance value (= reference resistance R ０ ) and writes the data to the memory (non-volatile memory) inside the data processing IC 51. This process is performed for each smartphone.

[0058] The flowchart shown in Fig. 9 is a flowchart for explaining the sequence of the above-mentioned processing. The processing of each step in the flowchart shown in Fig. 9 will be explained in order.

[0059] (Step S101) First, in step S101, the speaker module is attached to the smartphone body.

[0060] (Step S102) Next, in step S102, the inspection system 41 measures the temperature of the inspection environment using the thermometer 42, and sets the measured temperature as a reference temperature T ０ Let's say.

[0061] (Step S103) Next, in step S103, under the control of the inspection system 41, a test signal is output from the amplifier IC 52 inside the smartphone 10 to the speaker module 20. In other words, power is supplied to the coil.

[0062] (Step S104) Next, in step S104, the inspection system 41 calculates the resistance value R of the coil of the speaker module 20 from the voltage and current of the test signal.

[0063] (Step S105) Next, in step S105, the inspection system 41 determines whether the calculated resistance value R calculated in step S104 is a normal value. For example, if the value is not within a predetermined range due to a defect such as a broken coil, the resistance value is determined to be abnormal and the product is deemed to be defective. If the calculated resistance value R calculated in step S104 is within the predetermined range, the resistance value is determined to be normal, and the process proceeds to step S106.

[0064] (Step S106) Finally, in step S106, the inspection system 41 calculates the resistance value R calculated in step S104 as the reference resistance value R ０ The nonvolatile memory of the smartphone 10 stores the reference temperature T ０ Recorded and stored together (stored data = R ０ (T ０ ))do.

[0065] This process is performed for each smartphone. However, this method requires a reference resistance value R ０It is necessary to strictly manage the environmental temperature when measuring the temperature of the speaker module 20. Furthermore, as shown in Figure 8, the speaker module 20 is already installed inside the smartphone 10, and the temperature measured by the thermometer 42 is the temperature outside the smartphone 10. Therefore, there is also the problem that it is difficult to execute processing that accurately reflects the coil temperature of the speaker module 20.

[0066] 3. Processing Executed During Manufacturing of the Speaker-Equipped Device of the Present Disclosure Next, processing executed during manufacturing of the speaker-equipped device of the present disclosure will be described. That is, processing executed during manufacturing of the smartphone (speaker-equipped device) of the present disclosure will be described.

[0067] 10 is a diagram showing an example of the distribution of "coil temperature-resistance value correlation data" for a large number of smartphones, similar to the previously described FIG. 5. The "coil temperature-resistance value correlation data" for a large number of smartphones is distributed within the width of the "coil temperature-resistance value correlation data distribution region" shown in FIG.

[0068] That is, when there are many smartphones that are speaker-equipped devices, the reference temperature T ０ = The coil resistance value (= reference resistance) at 25°C is R ０ min~R ０ The values ​​are distributed between max and min.

[0069] In the process of the present disclosure, before the speaker module is attached to the smartphone, which is a speaker-equipped device, that is, during the manufacturing of the speaker module, a reference temperature T ０ = Measure the coil resistance value (= reference resistance) at 25°C.

[0070] Reference temperature T of each speaker module ０ Depending on the measurement results of the coil resistance value (=reference resistance) at 25°C, each speaker module is identified to which of the three divided regions shown in Figure 10, namely, Region L, Region T, and Region U, the speaker module belongs.

[0071] The number of divided regions is not limited to three, and various numbers of divided regions, such as two or more, can be set. In the example described below, an example in which the image is divided into three regions, region L, region T, and region U, will be described.

[0072] Region L is a region where the coil resistance value is relatively low in the "coil temperature-resistance value correlation data distribution region", and is, for example, a region where the coil resistance value is relatively low at a reference temperature (T ０ = 25°C) the reference resistance is the minimum value R ０ This is a region that includes the region where min is set.

[0073] The region T is a region in which the coil resistance value is relatively intermediate in the "coil temperature-resistance value correlation data distribution region", and is a region where ... ０ = 25°C) the reference resistance is the intermediate value R ０ It is a region that includes the region where

[0074] Region U is a region where the coil resistance value is high in the "coil temperature-resistance value correlation data distribution region", and is, for example, a region where the coil resistance value is high at a reference temperature (T ０ = 25°C) is the maximum reference resistance R ０ This is a region that includes the region where the maximum value is reached.

[0075] In this way, in the process of the present disclosure, before the speaker module is attached to the smartphone, which is a speaker-equipped device, that is, during the manufacturing of the speaker module, the reference temperature T ０ The coil resistance value (=reference resistance) at 25° C. is measured, and each speaker module is classified into one of the three divided areas shown in FIG. 10 according to the measurement results.

[0076] An example of the classification process of speaker modules into three divided regions will be described with reference to FIG.

[0077] 11 is a diagram illustrating the process before a speaker module is mounted on a smartphone, which is a speaker-equipped device, that is, during speaker module manufacturing. During the speaker module 120 manufacturing stage, the inspection system 110 is connected to the speaker module 120. That is, the inspection system 110 is connected to a setting that allows a test signal to be output from the inspection system 110 to the coil of the speaker module 120.

[0078] Thermometer 111 is installed near speaker module 120, and the temperature measured by thermometer 111 is input to inspection system 110. In the configuration previously described with reference to Fig. 8, the thermometer is installed near smartphone 10 to which the speaker module is assembled, but in the process of the present disclosure, thermometer 111 can be installed near speaker module 120 before it is assembled into the smartphone, making it possible to detect the coil temperature of speaker module 120 with higher accuracy.

[0079] The inspection system 110 monitors the temperature of the thermometer 111 and controls the temperature of the space in which the speaker module 120 is placed to a reference temperature (e.g., 25°C), and outputs a test signal to the coil of the speaker module 120 at this reference temperature.

[0080] The inspection system 110 calculates the resistance value of the coil (speaker coil) of the speaker module 120 at a reference temperature (e.g., 25°C) based on the output voltage and output current of this test signal. Furthermore, based on the calculated coil resistance value at the reference temperature (e.g., 25°C), the speaker modules are classified into the following three types of speaker modules: (1) Area L compatible speaker module 120L (2) Area T compatible speaker module 120T (3) Area U compatible speaker module 120U

[0081] Specifically, the classification process is performed as shown in the table at the bottom of Fig. 11. "(1) Area L compatible speaker module 120L" is a speaker module whose coil resistance value at the reference temperature (25°C) is in the range of 6.015 to 6.137 (Ω). "(2) Area T compatible speaker module 120T" is a speaker module whose coil resistance value at the reference temperature (25°C) is in the range of 6.138 to 6.262 (Ω). "(3) Area U compatible speaker module 120U" is a speaker module whose coil resistance value at the reference temperature (25°C) is in the range of 6.263 to 6.340 (Ω).

[0082] Furthermore, in the speaker module manufacturing stage, a process is executed in which area discrimination elements (Rcls0) having different resistance values ​​are mounted in parallel to the speaker unit 122 in the speaker module 120 according to the speaker module classification results, as shown in Figure 12. In other words, the elements are mounted in parallel to the coil (speaker coil) in the speaker unit 122.

[0083] Specifically, resistor mounting processing is performed for three different resistance values ​​(5 kΩ, 10 kΩ, 15 kΩ) according to the speaker module classification results as follows: For "(1) area L corresponding speaker module 120L," an area discrimination element 150L with a resistance value of 5 kΩ is mounted in parallel to the speaker unit 122. For "(2) area T corresponding speaker module 120T," an area discrimination element 150T with a resistance value of 10 kΩ is mounted in parallel to the speaker unit 122. For "(3) area U corresponding speaker module 120U," an area discrimination element 150U with a resistance value of 15 kΩ is mounted in parallel to the speaker unit 122.

[0084] That is, a "(1) area L-compatible speaker module 120L" whose coil resistance value at the reference temperature (25°C) is in the range of 6.015 to 6.137 (Ω) is fitted with an area discrimination element 150L with a resistance value of 5 kΩ. A "(2) area T-compatible speaker module 120T" whose coil resistance value at the reference temperature (25°C) is in the range of 6.138 to 6.262 (Ω) is fitted with an area discrimination element 150T with a resistance value of 10 kΩ. A "(3) area U-compatible speaker module 120U" whose coil resistance value at the reference temperature (25°C) is in the range of 6.263 to 6.340 (Ω) is fitted with an area discrimination element 150U with a resistance value of 15 kΩ. This type of resistor fitting process is performed during the manufacturing stage of the speaker module 120.

[0085] It should be noted that various division modes of the regions L, T, and U are possible. An example of the division mode of the regions L, T, and U will be described with reference to FIG. 13. First, the reference temperature T ０ The coil resistance value (=reference resistance) at the reference temperature T = 25°C is measured, and the distribution of variations in the coil resistance value is analyzed. ０ 1 shows the distribution data of coil resistance values ​​at 25°C.

[0086] In this way, the variation distribution of the coil resistance value is approximately normal. The median value of this normal distribution data (resistance value R = R ０ The region of ±σ of the resistance value is set as region T, and the regions on both sides of it are set as region L and region U. For example, in this way, the boundary of each region can be determined by using the variation distribution data of the coil resistance value.

[0087] It should be noted that the division into the regions L, T, and U may be performed in other ways. For example, the range of the variation distribution of the coil resistance value, that is, the minimum value R ０ min and the maximum coil resistance value R ０ max, this resistance value distribution R ０ min~R ０ The max region may be set to be equally divided.

[0088] In the example described with reference to FIG. 12 , the three types of area identification elements 150 to be attached according to the speaker module classification results are described as having three resistance values ​​of 5 KΩ, 10 KΩ, and 15 KΩ, but the resistance values ​​of 5 KΩ, 10 KΩ, and 15 KΩ are merely examples. The three resistance values ​​may be any resistance value that can be distinguished from each other, and various other settings are possible. For example, various settings are possible as long as the resistance values ​​are any combination that can be distinguished from each other, such as: 1 KΩ, 5 KΩ, 10 KΩ; 0.5 KΩ, 1 KΩ, 1.5 KΩ.

[0089] 12 has been described as a configuration in which the area identification elements 150L, ​​T, and U are connected in parallel to the speaker unit 122 inside the speaker enclosure 121, but various connection configurations for the area identification elements 150L, ​​T, and U are possible. For example, as shown in FIG. 14 , the area identification elements 150L, ​​T, and U may be installed on a flexible substrate outside the speaker enclosure 121. However, even in this example, the area identification elements 150L, ​​T, and U are connected in parallel to the speaker unit 122.

[0090] As described above, speaker modules 120 having the configurations shown in Fig. 12 and 13 are manufactured during the manufacturing stage of speaker module 120, that is, speaker modules 120L, T, U are manufactured to which area identification elements 150L, ​​T, U having different resistance values ​​(5 KΩ, 10 KΩ, 15 KΩ) corresponding to the coil resistance value at a reference temperature (e.g., 25°C) are connected. These speaker modules 120L, T, U are then attached to smartphones.

[0091] 4. Configuration Examples of the Speaker-Equipped Device of the Present Disclosure Next, configuration examples of the speaker-equipped device of the present disclosure will be described.

[0092] First, referring to Fig. 15 , a detailed configuration example of a speaker module 120 mounted inside a smartphone (speaker-equipped device) 100 will be described. The speaker module 120 has a configuration in which a speaker unit 122 is stored inside a speaker enclosure 121. As shown in Fig. 15 , the speaker unit 122 has a diaphragm 131 and a coil (speaker coil) 132, and power is supplied to the coil 132 via a coil power supply unit 133. This power supply drives the diaphragm 131 to output sound.

[0093] Furthermore, the speaker module 120 inside the smartphone (speaker-equipped device) 100 of the present disclosure has a configuration in which an area discrimination element (Rcls0) 150 is attached. The area discrimination element (Rcls0) 150 has a connection configuration that allows power to be fed from an area discrimination element power supply unit 151, and has a connection configuration in parallel with the speaker unit 122.

[0094] The area discrimination element (Rcls0) 150 is set to different resistance values ​​(5 KΩ, 10 KΩ, 15 KΩ) depending on the characteristics of the coil (speaker coil) 132 in the speaker unit 122. That is, as described above, area discrimination elements 150L, ​​T, U with different resistance values ​​(5 KΩ, 10 KΩ, 15 KΩ) depending on the coil resistance value at a reference temperature (e.g., 25°C) are attached.

[0095] Next, an example of the circuit configuration inside the smartphone (speaker-equipped device) 100 of the present disclosure will be described with reference to Fig. 16. As shown in Fig. 16, the smartphone (speaker-equipped device) 100 of this embodiment has a speaker module 120, a data processing unit (processor / controller) 160, an amplifier 161, an ADC (analog-to-digital converter) 162, a bias output unit 163, a pull-up resistor (Rpu0) 164, and a memory 165.

[0096] The speaker module 120 is configured to include a diaphragm 131, a coil (speaker coil) 132, and an area discrimination element (Rcls0) 150. As described above, the area discrimination element (Rcls0) 150 is a resistive element set to a resistance value (5 kΩ, 10 kΩ, or 15 kΩ) selected according to the coil resistance value of the coil (speaker coil) 132 at a reference temperature (e.g., 25° C.).

[0097] In this configuration, the data processing unit 160 supplies power to the coil (speaker coil) 132 of the speaker module 120 via the amplifier 161. This power supply causes the diaphragm 131 of the speaker module 120 to vibrate, and sound is output.

[0098] Before performing this audio output process, for example, when the smartphone 100 is started up, the data processing unit 160 calculates the resistance value of the area identification element (Rcls0) 150 in the speaker module 120 and stores the calculated resistance value in memory 165.

[0099] A predetermined current is supplied to the area discrimination element (Rcls0) 150 via an ADC (analog-digital converter) 162. The voltage of the output section of the ADC (analog-digital converter) 162 is maintained at a constant voltage by a pull-up resistor (Rpu0) 164 connected to a bias output section 163.

[0100] The data processing unit 160 calculates the resistance value of the area discrimination element (Rcls0) 150 based on the voltage and current supplied to the area discrimination element (Rcls0) 150.

[0101] As mentioned above, the area identification element (Rcls0) 150 is set to a resistance value (either 5KΩ, 10KΩ, or 15KΩ) selected according to the coil resistance value of the coil (speaker coil) 132 at a reference temperature (e.g., 25°C).

[0102] The data processing unit 160 writes the calculated resistance value (5 kΩ, 10 kΩ, or 15 kΩ) of the area discrimination element (Rcls0) 150 to the memory 165. After the process of calculating the resistance value of the area discrimination element (Rcls0) 150 and the process of writing to the memory are completed, the data processing unit 160 supplies power to the coil (speaker coil) 132 of the speaker module 120 via the amplifier 161, and starts audio output.

[0103] During the period in which this audio output is being performed, the data processing unit 160 measures changes in the voltage and current output to the coil (speaker coil) 132 via the amplifier 161, and calculates and monitors the resistance value of the coil (speaker coil) 132 based on the voltage and current output to the coil (speaker coil) 132.

[0104] Furthermore, the data processing unit 160 calculates the temperature of the coil (speaker coil) 132 based on the calculated resistance value of the coil (speaker coil) 132. The calculation of the coil temperature uses the previously explained (Equation 1), that is, the "coil temperature-resistance value correlation function" which is a correspondence relational expression between the coil temperature and the coil resistance value. However, the parameter R included in the previously explained (Equation 1) ０ , i.e., the reference temperature T ０ Coil resistance value (= reference resistance R ０ ) is stored in the memory 165 and corresponds to the region (regions L, T, U). ０ The value is

[0105] The data stored in the memory 165 will be described with reference to Fig. 17. Fig. 17 shows an example of data stored in the memory 165 of the smartphone 100. As shown in Fig. 17, the data stored in the memory includes the following data: (P) Resistance value of the element for area identification (Q) Correspondence data of the element resistance value for area identification and the reference resistance value (R) Coil temperature-resistance value correlation function

[0106] The "(P) area identification element resistance value" is the resistance value (either 5 KΩ, 10 KΩ, or 15 KΩ) of the area identification element (Rcls0) 150 calculated by the data processing unit 160 through the above-described processing. Note that the example shown in FIG. 17 shows an example in which 5 KΩ is recorded as the "(P) area identification element resistance value." This means that the resistance value of the coil 132 of the speaker module 120 at the reference temperature (25°C) is in the range of 6.015 to 6.137 (Ω), and that the speaker module corresponds to area L.

[0107] The "(Q) area identification element resistance value-reference resistance value correspondence data" and the "(R) coil temperature-resistance value correlation function" are data that are written in advance to the memory 165. Alternatively, the writing process may be executed under the control of the audio output application at a timing such as when the audio output application is started.

[0108] The "(Q) Area identification element resistance value-reference resistance value correspondence data" includes the "(P) area identification element resistance value" and the reference resistance R ０ The correspondence data between the reference resistance R ０ is the reference resistance R as a parameter included in the "(R) coil temperature-resistance value correlation function" ０ is.

[0109] For example, it is assumed that the resistance value of the area discrimination element (Rcls0) 150 calculated by the data processing unit 160 through the above-described process is 5 KΩ, and that 5 KΩ is recorded in the memory 165 as the “(P) area discrimination element resistance value.”

[0110] In this case, the data processing unit 160 calculates the reference resistance R associated with the "(P) area identifying element resistance value" = 5 KΩ from the "(Q) area identifying element resistance value - reference resistance value correspondence data." ０ = 6.076Ω (see FIG. 17). This is the reference resistance R applied to control the speaker module corresponding to the area L. ０ is the reference resistance R ０ This means that the resistance is 6.076Ω.

[0111] Furthermore, the data processing unit 160 calculates the reference resistance R ０= 6.076Ω is used as the reference resistance R as a parameter included in the “(R) coil temperature-resistance value correlation function” ０ That is, the reference resistance R ０ to R ０ = 6.076 Ω is substituted, and the calculation process of the coil temperature T based on the resistance value (R) of the coil (speaker coil) 132 is executed.

[0112]

[0113] In the above formula (1), T ０ :Reference temperature (=25℃) R ０ :Reference temperature T ０ Coil resistance value (= reference resistance R ０ = 6.076Ω) α: Coil material parameter that is a fixed value according to the coil material.

[0114] In the above formula (1), the reference temperature T ０ =25℃ Standard resistance R ０ =6.076Ω By setting the above parameters, it becomes possible to execute output control for the speaker module 120L corresponding to the area L with high precision.

[0115] An example of control corresponding to each area will be described with reference to Fig. 18. That is, from the "(Q) area discrimination element resistance value - reference resistance value correspondence data", the reference resistance R ０ The reference resistance R ０ is the reference resistance R, which is a parameter in the "(R) coil temperature-resistance value correlation function" ０ An example of control in which the coil temperature T is calculated and controlled using the above formula will be described with reference to FIG. 18.

[0116] In Fig. 18, the "(R) coil temperature-resistance value correlation function" for each of the regions L, T, and U is shown as a solid line within each region. For example, the "coil temperature-resistance value correlation function" within region L is the solid line shown within region L, and this solid line corresponds to the reference temperature T ０ =25℃ Standard resistance R ０= 6.076Ω This is the “coil temperature-resistance value correlation function” with the above parameters set.

[0117] The "coil temperature-resistance value correlation function" in the region T is the solid line shown in the region T, and this solid line corresponds to the reference temperature T ０ =25℃ Standard resistance R ０ = 6.2Ω This is the "coil temperature-resistance value correlation function" with the above parameters set.

[0118] Furthermore, the "coil temperature-resistance value correlation function" in region U is the solid line shown in region U, and this solid line corresponds to the reference temperature T ０ =25℃ Standard resistance R ０ = 6.326 Ω This is the "coil temperature-resistance value correlation function" with the above parameters set.

[0119] In this way, the data processing unit 160 of the smartphone (device equipped with a speaker) 100 of the present disclosure applies a "coil temperature-resistance value correlation function" that varies depending on the coil resistance value of the coil 132 of the speaker module 120 at a reference temperature (e.g., 25°C), calculates the temperature of the coil 132 of the speaker module 120, and controls the audio output for the speaker module 120. Specifically, for example, the data processing unit 160 controls the output current for the coil (speaker coil) 132 of the speaker module 120.

[0120] Referring to FIG. 19, an example will be described in which control is performed to start a process of reducing the output current to the speaker coil 132 in order to prevent the temperature of the speaker coil 132 from rising when the temperature of the speaker coil 132 reaches 90° C.

[0121] 19 shows the "coil temperature-resistance correlation function" for each of the regions L, T, and U. The solid lines in each region correspond to the "coil temperature-resistance correlation function" for each region.

[0122] For example, the data processing unit 160 of the smartphone 100 equipped with the speaker module 120L corresponding to the region L executes control based on the "coil temperature-resistance value correlation function" shown by the solid line in the region L in FIG. 19. That is, in the above (Equation 1), ０=25℃ Standard resistance R ０ = 6.076Ω Control is performed based on the "coil temperature-resistance value correlation function" for which the above parameters are set.

[0123] In this case, the data processing unit 160 of the smartphone 100 calculates the observed resistance value R of the coil 132 in the speaker module 120L. ＳＬ = 7.49 Ω, it is determined that the coil temperature T has reached the control start temperature of 90° C., and processing to reduce the output to the coil 132 in the speaker module 120L is started.

[0124] The speaker modules 120L corresponding to area L include speaker modules whose coil resistance values ​​at the reference temperature (25°C) are in the range of 6.015 to 6.137 (Ω), and the control start temperature range for speaker modules having coil resistance values ​​in this range is set to a temperature range that does not deviate significantly from 90°C, as shown in "Control start temperature range for speaker modules corresponding to area L" in Figure 19, thereby achieving more accurate output control.

[0125] Furthermore, the data processing unit 160 of the smartphone 100 equipped with the speaker module 120T corresponding to the region T executes control based on the "coil temperature-resistance value correlation function" shown by the solid line in the region T of FIG. 19. That is, in the above (Equation 1), ０ =25℃ Standard resistance R ０ = 6.2Ω Control is performed based on the "coil temperature-resistance value correlation function" for which the above parameters are set.

[0126] In this case, the data processing unit 160 of the smartphone 100 calculates the observed resistance value R of the coil 132 in the speaker module 120T. ＳＴ = 7.77Ω, it is determined that the coil temperature T has reached the control start temperature of 90°C, and processing to reduce the output to the coil 132 in the speaker module 120T is started.

[0127] Furthermore, the data processing unit 160 of the smartphone 100 equipped with the speaker module 120U corresponding to the region U executes control based on the "coil temperature-resistance value correlation function" shown by the solid line in the region U of FIG. 19. That is, in the above (Equation 1), ０ =25℃ Standard resistance R ０ = 6.326 Ω Control is performed based on the "coil temperature-resistance value correlation function" for which the above parameters are set.

[0128] In this case, the data processing unit 160 of the smartphone 100 calculates the observed resistance value R of the coil 132 in the speaker module 120U. ＳＵ = 7.85Ω, it is determined that the coil temperature T has reached the control start temperature of 90°C, and processing to reduce the output to the coil 132 in the speaker module 120U is started.

[0129] In this way, the data processing unit 160 of the smartphone 100 of the present disclosure determines which of the areas L, T, or U the speaker module 120 mounted on the smartphone 100 corresponds to based on the resistance value of the area identification element (Rcls0), and based on this determination result, changes the parameters set in the "coil temperature-resistance value correlation function" to calculate the coil temperature, and performs output control for the speaker module 120.

[0130] By performing such output control, it is possible to perform more accurate control according to the coil characteristics of the speaker module 120. That is, the reference temperature (T ０ ) at the reference resistance (R ０ ) can be reflected in the difference, allowing for more precise control.

[0131] 5. Processing Sequence of the Present Disclosure Next, a processing sequence of the present disclosure will be described.

[0132] The following processing sequences will be described with reference to the flowcharts shown in Figure 20 and subsequent figures: (1) Speaker module manufacturing sequence (2) Audio output control sequence in a smartphone (speaker-equipped device)

[0133] (5-1. Speaker Module Manufacturing Sequence) First, the speaker module manufacturing sequence will be described with reference to the flowchart shown in FIG.

[0134] This speaker module manufacturing sequence corresponds to the processing previously described with reference to Figures 11 to 14, and is processing executed under the control of the inspection system 110 shown in Figure 11. Below, the processing of each step in the flowchart shown in Figure 20 will be explained in order.

[0135] (Step S201) First, in step S201, the inspection system 110 shown in FIG. 11 outputs a test signal to the speaker module when the speaker module is assembled, and measures the resistance value R of the coil of the speaker module.

[0136] Specifically, the reference temperature T ０ At this temperature (for example, 25° C.), a test signal is output to the speaker module (power is supplied to the coil), and the resistance value R of the coil of the speaker module is measured.

[0137] (Step S202) Next, in step S202, the inspection system 110 shown in FIG. 11 detects a reference temperature T ０ It is determined which of the regions L, T, and U in the temperature-coil resistance correlation data the coil resistance value R of the speaker module in the table corresponds to.

[0138] The regions L, T, and U are the regions L, T, and U shown in FIG. 10. As shown in FIG. 11, the following region determination process is performed: (1) Reference temperature T ０ A speaker module whose coil resistance value R at (25°C) is in the range of 6.015 to 6.137 (Ω) is defined as a "speaker module 120L corresponding to area L." (2) Reference temperature T ０ A speaker module whose coil resistance value R at (25°C) is in the range of 6.138 to 6.262 (Ω) is defined as a "speaker module 120T corresponding to region T." ０ A speaker module whose coil resistance value R at 25° C. is in the range of 6.263 to 6.340 (Ω) is called a "region U compatible speaker module 120U."

[0139] (Step S203) Next, in step S203, the inspection system 110 shown in FIG. 11 determines whether the determination area of ​​the speaker module is area L, area T, or area U.

[0140] If the determination area of ​​the speaker module is "area L", proceed to step S211. If the determination area of ​​the speaker module is "area T", proceed to step S212. If the determination area of ​​the speaker module is "area U", proceed to step S213.

[0141] (Step S211) If it is determined in step S203 that the judgment area of ​​the speaker module is "Area L", in step S211, a 5KΩ resistor corresponding to "Area L" indicating that it is "Area L" is attached to the speaker module 120 as an area identification element (Rcls0).

[0142] That is, as shown in "(1) Speaker module 120L for area L" in FIG. 12, an area discrimination element 150L having a resistance value of 5 KΩ is attached in parallel to the speaker unit 122.

[0143] (Step S212) If it is determined in step S203 that the judgment area of ​​the speaker module is "Area T", in step S212, a 10KΩ resistor corresponding to "Area T" indicating that it is "Area T" is attached to the speaker module 120 as an area identification element (Rcls0).

[0144] That is, as shown in "(2) Area L corresponding speaker module 120T" in FIG. 12, an area discrimination element 150T with a resistance value of 10 KΩ is attached in parallel to the speaker unit 122.

[0145] (Step S213) If it is determined in step S203 that the judgment area of ​​the speaker module is "Area U", in step S213, a 15KΩ resistor corresponding to "Area U" indicating that it is "Area U" is attached to the speaker module 120 as an area identification element (Rcls0).

[0146] That is, as shown in "(3) Area U compatible speaker module 120U" in FIG. 12, an area identification element 150U having a resistance value of 15 KΩ is attached in parallel to the speaker unit 122.

[0147] In this manner, three types of speaker modules 120L, 120T, and 120U are manufactured, each equipped with area discrimination elements 150L, ​​150T, and 150U having three different resistance values ​​as shown in FIG.

[0148] These three types of speaker modules 120L, 120T, and 120U are attached to the smartphone 100 to manufacture the smartphone. That is, the smartphone 100 having the configuration described with reference to FIGS. 15 and 16 is manufactured.

[0149] (5-2. Audio Output Control Sequence in Smartphone (Device Equipped with Speaker)) Next, the audio output control sequence in a smartphone (device equipped with speaker) will be described.

[0150] Referring to Figure 21 and subsequent figures, we will explain the audio output control sequence in a smartphone (speaker-equipped device) executed by a smartphone 100 equipped with one of three types of speaker modules 120L, 120T, 120U equipped with area identification elements 150L, ​​150T, 150U having three different resistance values.

[0151] The processing of the flowcharts shown in Figures 21 and onwards is processing executed under the control of the data processing unit 160 of the smartphone 100 shown in Figure 16.

[0152] The process of each step in the flowchart shown in Fig. 21 will be described below in order. (Step S301) First, in step S301, the smartphone is started up.

[0153] (Step S302) Next, the data processing unit 160 of the smartphone 100 detects the resistance value of the area identification element (Rcls0) 150 in step S302.

[0154] 16 , a predetermined current is supplied to the area discrimination element (Rcls0) 150 mounted in the speaker module 120 via an ADC (analog-digital converter) 162. The voltage at the output of the ADC (analog-digital converter) 162 is maintained at a constant voltage by a pull-up resistor (Rpu0) 164 connected to a bias output unit 163.

[0155] The data processing unit 160 calculates the resistance value of the area discrimination element (Rcls0) 150 based on the voltage and current supplied to the area discrimination element (Rcls0) 150. The area discrimination element (Rcls0) 150 is set to a resistance value (5 kΩ, 10 kΩ, or 15 kΩ) corresponding to each of the areas (L, T, U) determined according to the coil resistance value of the coil (speaker coil) 132 at a reference temperature (e.g., 25°C).

[0156] (Step S303) Next, in step S303, the data processing unit 160 of the smartphone 100 determines whether the resistance value of the area identification element (Rcls0) 150 calculated in step S302 is 5 kΩ, 10 kΩ, or 15 kΩ.

[0157] If the resistance value of the area discrimination element (Rcls0) 150 is 5 KΩ, the process proceeds to step S311. If the resistance value of the area discrimination element (Rcls0) 150 is 10 KΩ, the process proceeds to step S321. If the resistance value of the area discrimination element (Rcls0) 150 is 15 KΩ, the process proceeds to step S331.

[0158] (Step S311) If it is determined in step S303 that the resistance value of the area identification element (Rcls0) 150 is 5 KΩ, the data processing unit 160 of the smartphone 100 writes the resistance value of the area identification element (Rcls0), 5 KΩ, to the ``(P) Area Identification Element Resistance Value'' recording area of ​​the memory in step S311.

[0159] The resistance value of 5 kΩ of the area identification element (Rcls0) means that the speaker module 120 of this smartphone 100 is a speaker module 120L that supports the "L area."

[0160] As previously described with reference to Fig. 17, the memory 165 stores the following data: (P) Resistance value of element for area discrimination (Q) Correspondence data of resistance value of element for area discrimination vs. reference resistance value (R) Coil temperature vs. resistance value correlation function

[0161] In step S311, a process is executed to record the resistance value of 5 KΩ of the area discrimination element (Rcls0) in the recording area of ​​"(P) Area Discrimination Element Resistance Value."

[0162] It should be noted that the "(Q) area identification element resistance value-reference resistance value correspondence data" and the "(R) coil temperature-resistance value correlation function" are data that are written in advance in the memory 165.

[0163] (Step S321) Also, if it is determined in step S303 that the resistance value of the area identification element (Rcls0) 150 is 10 KΩ, the data processing unit 160 of the smartphone 100 writes the resistance value of the area identification element (Rcls0), 10 KΩ, to the ``(P) Area Identification Element Resistance Value'' recording area of ​​the memory in step S321.

[0164] The resistance value of the region identification element (Rcls0) of 10 KΩ means that the speaker module 120 of this smartphone 100 is a speaker module 120T that corresponds to the "T region."

[0165] (Step S331) Furthermore, if it is determined in step S303 that the resistance value of the area identification element (Rcls0) 150 is 15 KΩ, the data processing unit 160 of the smartphone 100 writes the resistance value 15 KΩ of the area identification element (Rcls0) to the ``(P) Area Identification Element Resistance Value'' recording area of ​​the memory in step S331.

[0166] The resistance value of the region identification element (Rcls0) of 15 kΩ means that the speaker module 120 of this smartphone 100 is a speaker module 120U that supports the "U region."

[0167] (Step S312) In step S311, when the process of writing the resistance value 5KΩ of the area identification element (Rcls0) to the recording area of ​​the “(P) Area Identification Element Resistance Value” in the memory 165 is completed, the data processing unit 160 of the smartphone 100 executes the process of step S312.

[0168] As mentioned above, the resistance value of the area identification element (Rcls0) of 5 kΩ means that the speaker module 120 of this smartphone 100 is a speaker module 120L that corresponds to the "L area."

[0169] In step S312, the data processing unit 160 of the smartphone 100 calculates the reference resistance value R of the L region based on the resistance value 5 kΩ of the region identification element (Rcls0) written in the recording area of ​​the “(P) region identification element resistance value” of the memory 165. ０ is obtained from the "(Q) Area Identification Element Resistance Value-Reference Resistance Value Correspondence Data" in the memory. ０ is the reference resistance value R of the L region ０ = 6.076 Ω (see FIG. 17).

[0170] (Step S322) Also, in step S321, when the process of writing the resistance value of the area identification element (Rcls0) of 10 KΩ to the recording area of ​​``(P) Area Identification Element Resistance Value'' in the memory 165 is completed, the data processing unit 160 of the smartphone 100 executes the process of step S322.

[0171] As mentioned above, the resistance value of 10 KΩ of the area identification element (Rcls0) means that the speaker module 120 of this smartphone 100 is a speaker module 120T that corresponds to the "T area."

[0172] In step S322, the data processing unit 160 of the smartphone 100 calculates the reference resistance value R of the T region based on the resistance value 10 KΩ of the region identification element (Rcls0) written in the recording area of ​​the “(P) region identification element resistance value” of the memory 165. ０ is obtained from the "(Q) Area Identification Element Resistance Value-Reference Resistance Value Correspondence Data" in the memory. ０ is the reference resistance value R of the T region０ = 6.2Ω (see FIG. 17).

[0173] (Step S332) In step S331, when the process of writing the resistance value 15KΩ of the area identification element (Rcls0) to the recording area of ​​the "(P) Area Identification Element Resistance Value" in the memory 165 is completed, the data processing unit 160 of the smartphone 100 executes the process of step S332.

[0174] As mentioned above, the resistance value of the region identification element (Rcls0) of 15 kΩ means that the speaker module 120 of this smartphone 100 is a speaker module 120U that supports the "U region."

[0175] In step S332, the data processing unit 160 of the smartphone 100 calculates the reference resistance value R of the U region based on the resistance value 15 kΩ of the region identification element (Rcls0) written in the recording area of ​​the “(P) region identification element resistance value” of the memory 165. ０ is obtained from the "(Q) Area Identification Element Resistance Value-Reference Resistance Value Correspondence Data" in the memory. ０ is the reference resistance value R of the U region ０ = 6.326 (see FIG. 17) Ω.

[0176] (Step S340) Execute any one of steps S312, S322, and S332 to obtain the reference resistance value R corresponding to any one of the L region, T region, and U region from the "(Q) Region Identification Element Resistance Value-Reference Resistance Value Correspondence Data" in the memory 165. ０ When the acquisition process is completed, the data processing unit 160 of the smartphone 100 starts output control for the speaker module 120 in accordance with the coil temperature-resistance value correlation equation in step S340.

[0177] That is, the coil temperature T is calculated based on the resistance value (R) of the coil (speaker coil) 132 according to the following (Equation 1) described above, and the output of the speaker module 120 is controlled according to the calculation result.

[0178]

[0179] In the above formula (1), T０ : Reference temperature (e.g., 25°C) R ０ :Reference temperature T ０ Coil resistance value (= reference resistance R ０ ) α: Coil material parameter, which is a fixed value depending on the coil material.

[0180] In addition, the reference resistance R ０ The value of will be different for each of the three types of smartphones: smartphones compatible with area L, smartphones compatible with area T, and smartphones compatible with area U, and different controls will be executed for each.

[0181] The different reference resistances R of these three types of smartphones ０ and the values ​​of these different reference resistances R ０ A specific control process using the coil temperature-resistance correlation equation in which the value of is set will be described with reference to FIG.

[0182] In the case of a smartphone equipped with the area L compatible speaker module 120L in which the resistance value of the area identification element (Rcls0) 150 is 5 KΩ, the processing shown at the left end of FIG. 23 is executed.

[0183] In this case, the reference temperature T ０ The reference resistance value R of the speaker coil in ０ The value of is the reference resistance value R corresponding to the region L. ０ = 6.076 Ω.

[0184] In this case, the parameter R in the above (Equation 1) ０ The value of R ０ = 6.076Ω, and the calculation process of the coil temperature T is executed. By this coil temperature calculation process, the observed resistance value R of the coil 132 in the speaker module 120L is calculated as described above with reference to FIG. ＳＬ = 7.49 Ω, it is determined that the coil temperature T has reached the control start temperature of 90° C., and processing to reduce the output to the coil 132 in the speaker module 120L is started.

[0185] In addition, in the case of a smartphone equipped with a region T compatible speaker module 120T in which the resistance value of the region identification element (Rcls0) 150 is 10 KΩ, the processing shown in the center of Figure 23 is executed.

[0186] In this case, the reference temperature T ０ The reference resistance value R of the speaker coil in ０ The value of is the reference resistance value R corresponding to the region T. ０ = 6.2 Ω.

[0187] In this case, the parameter R in the above (Equation 1) ０ The value of R ０ = 6.2Ω, and the calculation process of the coil temperature T is executed. As described above with reference to FIG. 19, this coil temperature calculation process calculates the observed resistance value R of the coil 132 in the speaker module 120T. ＳＴ = 7.77Ω, it is determined that the coil temperature T has reached the control start temperature of 90°C, and processing to reduce the output to the coil 132 in the speaker module 120T is started.

[0188] Furthermore, in the case of a smartphone equipped with a region U compatible speaker module 120U in which the resistance value of the region identification element (Rcls0) 150 is 15 KΩ, the processing shown at the right end of Figure 23 is executed.

[0189] In this case, the reference temperature T ０ The reference resistance value R of the speaker coil in ０ The value of is the reference resistance value R corresponding to the region U. ０ = 6.326 Ω.

[0190] In this case, the parameter R in the above (Equation 1) ０ The value of R ０ = 6.326 Ω, and the calculation process of the coil temperature T is executed. As described above with reference to FIG. 19, this coil temperature calculation process calculates the observed resistance value R of the coil 132 in the speaker module 120U. ＳＵ= 7.86 Ω, it is determined that the coil temperature T has reached the control start temperature of 90° C., and processing to reduce the output to the coil 132 in the speaker module 120U is started.

[0191] In this way, the data processing unit 160 of the smartphone 100 of the present disclosure determines which of the areas L, T, or U the speaker module 120 mounted on the smartphone 100 corresponds to based on the resistance value of the area identification element (Rcls0), and based on this determination result, changes the parameters set in the "coil temperature-resistance value correlation function" to calculate the coil temperature, and performs output control for the speaker module 120.

[0192] By performing such output control, it is possible to perform more accurate control according to the coil characteristics of the speaker module 120. That is, the reference temperature (T ０ ) at the reference resistance (R ０ ) can be reflected in the difference, allowing for more precise control.

[0193] [6. Example of Executing Output Control Processing Using Different "Coil Temperature-Resistance Value Correlation Functions" in Which Multiple Reference Resistors Corresponding to Multiple Reference Temperatures are Set] Next, an example of executing output control processing using different "coil temperature-resistance value correlation functions" in Which multiple reference resistors corresponding to multiple reference temperatures are set will be described.

[0194] In the above-described embodiment, the "coil temperature-resistance value correlation function", that is, the parameter of the above-described (Equation 1), T ０ :Reference temperature R ０ :Reference temperature T ０ Coil resistance value (= reference resistance R ０ ) These parameters include the reference temperature T ０ =25℃, standard resistance R ０ =(Reference temperature T ０ = 25°C) This one combination was set and a processing example using only one "coil temperature-resistance value correlation function" was explained.

[0195] However, the correlation between the coil temperature and the coil resistance value may differ between high temperature and low temperature regions. An example of the correlation between the coil temperature and the coil resistance value will be described with reference to FIG.

[0196] The graph in Figure 24 is a graph in which the horizontal axis is the coil temperature and the vertical axis is the coil resistance. The solid line is the "coil temperature-resistance correlation function" corresponding to the previously explained (Equation 1). This "coil temperature-resistance correlation function" is ０ =25℃, standard resistance R ０ =(Reference temperature T ０ = 25°C) is one "coil temperature - resistance value correlation function" obtained by setting these parameters.

[0197] However, for example, the actual coil temperature-resistance correlation may show different slopes on the high temperature side and the low temperature side, as shown by the dotted line in the graph of Figure 24. Note that in Figure 24, the change in slope is shown to be greater than it actually is, in order to make it easier to understand.

[0198] In this way, the actual coil temperature-resistance correlation may show different slopes on the high temperature side and the low temperature side, as shown by the dotted lines in the graph of Figure 24. In such cases, it is considered ideal to use a "coil temperature-resistance correlation function" that is different on the high temperature side and the low temperature side, as shown in Figure 25.

[0199] The example shown in FIG. 25 is a diagram for explaining an example of using a "coil temperature-resistance value correlation function" in which the coil temperature differs between the low-temperature side and the high-temperature side. On the low-temperature side of the coil, as explained above, the reference temperature T ０ =25℃, standard resistance R ０ =(Reference temperature T ０ = 25°C) Control is performed using the "coil temperature-resistance value correlation function" in which this combination is set, that is, the "coil temperature-resistance value correlation function" shown by the following (Equation 1).

[0200]

[0201] In the above formula (1), T ０: Low temperature side reference temperature (25℃) R ０ : Low temperature side reference temperature T ０ (= 25°C) Coil resistance value (= low temperature reference resistance R ０ ) α: Coil material parameter, which is a fixed value depending on the coil material.

[0202] On the other hand, when the coil temperature is on the high temperature side, the high temperature side reference temperature T １ =60℃, high temperature side reference resistance R １ =(High temperature side reference temperature T １ = 60°C) (= high temperature reference resistance R １ ) Control is performed using the "coil temperature-resistance value correlation function" that sets this combination, that is, the "coil temperature-resistance value correlation function" shown in the following (Equation 2).

[0203]

[0204] In the above formula (2), T １ : High temperature side reference temperature (60℃) R １ : High temperature side reference temperature T １ (= 60°C) Coil resistance value (= high temperature reference resistance R １ ) α: Coil material parameter, which is a fixed value depending on the coil material.

[0205] The observation data when actually performing control, i.e., the data that can be detected by the data processing unit 160 of the smartphone 100, is the resistance value (R) of the coil (speaker coil) 132 of the speaker module 120, and switching between control applying the above (Equation 1) and control applying the above (Equation 2) is performed based on the detected resistance value (R) of the coil (speaker coil) 132.

[0206] Specifically, the switching control is performed as shown in Fig. 26. In the example shown in Fig. 26, when the resistance value (R) of the coil (speaker coil) 132 of the speaker module 120 detected by the data processing unit 160 of the smartphone 100 is less than 6.5Ω, the control applying the above (Equation 1) is performed, and in a region where the resistance value (R) of the coil (speaker coil) 132 is 6.5Ω or more, the control applying the above (Equation 2) is performed.

[0207] That is, when the resistance value (R) of the coil (speaker coil) 132 is less than 6.5Ω, the data processing unit 160 of the smartphone 100 executes control using the "coil temperature-resistance value correlation function" shown in (Equation 1) for the low temperature side, and when the resistance value (R) of the coil (speaker coil) 132 is 6.5Ω or more, the data processing unit 160 executes control using the "coil temperature-resistance value correlation function" shown in (Equation 2) for the high temperature side. By performing such control, it becomes possible to perform control that reflects the actual coil temperature-resistance value correlation.

[0208] In this embodiment, as described above, control is performed according to the area, that is, control is performed for each of the divided areas L, U, and T, which are set according to the resistance characteristics of the coil (speaker coil) 132 of the speaker module 120.

[0209] The area division into areas L, U, and T can be performed by using the distribution data of the coil resistance at each reference temperature as described above with reference to Fig. 13. An example of the area division into areas L, T, and U will be described with reference to Fig. 27.

[0210] First, for a large number of sample speaker modules, the low-temperature reference temperature T ０ The coil resistance value (=reference resistance) at the low-temperature side reference temperature T ０ 1 shows the distribution data of coil resistance values ​​at 25°C.

[0211] In this way, the variation distribution of the coil resistance value is approximately normal. The median value of this normal distribution data (resistance value R = R ０ The region of ±σ of the reference temperature T is set as region T, and the regions on both sides of the region are set as region L and region U. When control is performed using the "coil temperature-resistance value correlation function" shown in (Equation 1) for the low temperature side, this low temperature reference temperature T ０ The regions L, T, and U divided based on the coil resistance value distribution data at 25°C are used.

[0212] Furthermore, for a large number of sample speaker modules, the high temperature reference temperature T １The coil resistance value (=reference resistance) at the high-temperature side reference temperature T １ 1 shows the distribution data of coil resistance values ​​at 60°C.

[0213] In this case, the variation distribution of the coil resistance value is also approximately normal. The median value of this normal distribution data (resistance value R = R １ The region of ±σ of the temperature difference θ is set as region T, and the regions on both sides of the region are set as region L and region U. When control is performed using the "coil temperature-resistance value correlation function" shown in (Equation 2) for the high temperature side, this high temperature side reference temperature T １ The regions L, T, and U divided based on the coil resistance value distribution data at 60°C are used.

[0214] For example, the boundaries of each region can be determined by using the distribution data of variations in the coil resistance values ​​in this way.

[0215] It should be noted that the division into the regions L, T, and U may be performed in other ways. For example, the range of the variation distribution of the coil resistance value, that is, the minimum value R ０ min and the maximum coil resistance value R ０ max, this resistance value distribution R ０ min~R ０ The max region may be set to be equally divided.

[0216] In this embodiment, in the manufacturing stage of the speaker module 120, two reference temperatures, namely, a low-side reference temperature T ０ (=25℃), high temperature side reference temperature T １ (=60°C), the resistance value of the coil (speaker coil) 132 of each speaker module 120 is measured at each of these two reference temperatures, and a process is performed to classify the speaker modules into groups of regions L, T, and U in units of each reference temperature.

[0217] Furthermore, in the speaker module manufacturing stage, depending on the speaker module classification results, a process is performed in which a low-temperature side area identification element (Rcls0) and a high-temperature side area identification element (Rcls1) are installed in the speaker module 120, and these two resistors are mounted in parallel to the speaker unit 122, as shown in Figures 28 and 29.

[0218] FIG. 28 is a diagram showing an example of the installation of a low-temperature range identification element (Rcls0). As shown in FIG. 28, the following low-temperature range identification element (Rcls0) is installed. A low-temperature range identification element (Rcls0) 150La with a resistance value of 5 KΩ is installed in a "(1) range L-compatible speaker module 120L" whose coil resistance value at the low-temperature reference temperature (25°C) is in the range of 6.015 to 6.137 (Ω). A low-temperature range identification element (Rcls0) 150Ta with a resistance value of 10 KΩ is installed in a "(2) range T-compatible speaker module 120T" whose coil resistance value at the low-temperature reference temperature (25°C) is in the range of 6.138 to 6.262 (Ω). A low-temperature region identification element (Rcls0) 150Ua with a resistance value of 15 KΩ is attached to the "(3) Region U compatible speaker module 120U" whose coil resistance value at the low-temperature reference temperature (25°C) is in the range of 6.263 to 6.340 (Ω). This resistor attachment process is performed during the speaker module 120 manufacturing stage.

[0219] Furthermore, as shown in Figure 29, the following high temperature side zone identification element (Rcls1) is attached. A high temperature side zone identification element (Rcls1) 150Lb with a resistance value of 5 KΩ is attached to the "(1) Zone L compatible speaker module 120L" whose coil resistance value at the high temperature side reference temperature (60°C) is in the range of 6.889 to 7.028 (Ω). A high temperature side zone identification element (Rcls1) 150Tb with a resistance value of 10 KΩ is attached to the "(2) Zone T compatible speaker module 120T" whose coil resistance value at the high temperature side reference temperature (60°C) is in the range of 7.029 to 7.171 (Ω). A high temperature region identification element (Rcls1) 150Ub with a resistance value of 15 KΩ is attached to the "(3) Region U compatible speaker module 120U" whose coil resistance value at the high temperature reference temperature (60°C) is in the range of 7.172 to 7.317 (Ω). This resistor attachment process is performed during the speaker module 120 manufacturing stage.

[0220] 28 and 29 illustrate a configuration example in which the area identification element 150 is connected in parallel to the speaker unit 122 inside the speaker enclosure 121, but various connection configurations for the area identification element 150 are possible. For example, as previously described with reference to FIG. 14 , the area identification element 150 may be installed on a flexible substrate outside the speaker enclosure 121. However, even in this example, the area identification element 150 is configured to be connected in parallel to the speaker unit 122.

[0221] As described above, during the manufacturing stage of the speaker module 120, the speaker module 120 having the configuration shown in Figures 28 to 29 is manufactured, that is, the speaker modules 120L, T, U are manufactured in which low temperature side region identification elements (Rcls0) 150La, Ta, Ua having different resistance values ​​(5 KΩ, 10 KΩ, 15 KΩ) corresponding to the coil resistance value at the low temperature side reference temperature (25 ° C) and high temperature side region identification elements (Rcls1) 150Lb, Tb, Ub having different resistance values ​​(5 KΩ, 10 KΩ, 15 KΩ) corresponding to the coil resistance value at the high temperature side reference temperature (60 ° C) are connected. Then, these speaker modules 120L, T, U are attached to smartphones.

[0222] An example of the circuit configuration inside the smartphone (speaker-equipped device) 100b of this embodiment will be described with reference to Figure 30. As shown in Figure 30, the smartphone (speaker-equipped device) 100b of this embodiment has a speaker module 120, a data processing unit (processor / controller) 160, an amplifier 161, two ADCs (analog-to-digital converters) 162a, b, a bias output unit 163, two pull-up resistors (Rpu0, Rpu1) 164a, b, and a memory 165.

[0223] The speaker module 120 has a configuration in which a diaphragm 131, a coil (speaker coil) 132, a low temperature range identification element (Rcls0) 150a, and a high temperature range identification element (Rcls1) 150b are mounted.

[0224] As mentioned above, the low-temperature side region identification element (Rcls0) 150a is a resistive element set to a resistance value (either 5 KΩ, 10 KΩ, or 15 KΩ) selected according to the coil resistance value of the coil (speaker coil) 132 at the low-temperature side reference temperature (e.g., 25°C).

[0225] In addition, the high temperature side area identification element (Rcls1) 150b is a resistive element set to a resistance value (either 5KΩ, 10KΩ, or 15KΩ) selected according to the coil resistance value at the high temperature side reference temperature (e.g., 60°C) of the coil (speaker coil) 132.

[0226] In this configuration, the data processing unit 160 supplies power to the coil (speaker coil) 132 of the speaker module 120 via the amplifier 161. This power supply causes the diaphragm 131 of the speaker module 120 to vibrate, and sound is output.

[0227] During the period in which this audio output is being performed, the data processing unit 160 measures changes in the voltage and current output to the coil (speaker coil) 132 via the amplifier 161, and calculates and monitors the resistance value of the coil (speaker coil) 132 based on the voltage and current output to the coil (speaker coil) 132.

[0228] Before executing this audio output process, for example, when the smartphone 100 is started up, the data processing unit 160 calculates the resistance values ​​of two resistor elements in the speaker module 120, namely, the low-temperature side area identification element (Rcls0) 150a and the high-temperature side area identification element (Rcls1) 150b, and stores the calculated resistance values ​​in the memory 165.

[0229] A predetermined current is supplied to the low-temperature range identification element (Rcls0) 150a and the high-temperature range identification element (Rcls1) 150b via ADCs (analog-digital converters) 162a and 162b, respectively. The voltages at the outputs of the ADCs (analog-digital converters) 162a and 162b are maintained at a constant voltage by pull-up resistors (Rpu0, Rpu1) 164a and 164b connected to a bias output unit 163.

[0230] The data processing unit 160 calculates the resistance value of the low temperature range identification element (Rcls0) 150a based on the voltage and current supplied to the low temperature range identification element (Rcls0) 150a. Furthermore, the data processing unit 160 calculates the resistance value of the high temperature range identification element (Rcls1) 150b based on the voltage and current supplied to the high temperature range identification element (Rcls1) 150b. As mentioned above, these resistors are set to a resistance value (5 kΩ, 10 kΩ, or 15 kΩ) selected according to the coil resistance value of the coil (speaker coil) 132 at a reference temperature (e.g., 25°C).

[0231] The data processing unit 160 writes the calculated resistance values ​​(5 kΩ, 10 kΩ, or 15 kΩ) of the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b to the memory 165. After the calculation process of the resistance values ​​of the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b and the memory writing process are completed, the data processing unit 160 supplies power to the coil (speaker coil) 132 of the speaker module 120 via the amplifier 161 to start audio output.

[0232] The data stored in the memory 165 will be described with reference to Fig. 31. Fig. 31 shows an example of data stored in the memory 165 of the smartphone 100b. As shown in Fig. 31, the data stored in the memory includes the following data: (P) Resistance value of the element for area identification (Q) Correspondence data of the element resistance value for area identification and the reference resistance value (R) Coil temperature-resistance value correlation function

[0233] The "(P) area identification element resistance value" is the resistance value (5 kΩ, 10 kΩ, or 15 kΩ) of the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b detected by the data processing unit 160. Note that the example shown in Fig. 31 shows an example in which 5 kΩ is recorded as the "(P) area identification element resistance value" for both the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b.

[0234] This means that the resistance value of coil 132 of speaker module 120 at the low-temperature reference temperature (25°C) is in the range of 6.015 to 6.137 (Ω), and that the speaker module corresponds to region L on the low-temperature side. Furthermore, the resistance value of coil 132 of speaker module 120 at the high-temperature reference temperature (60°C) is in the range of 6.889 to 7.028 (Ω), and that the speaker module also corresponds to region L on the high-temperature side.

[0235] The "(Q) area identification element resistance value-reference resistance value correspondence data" and the "(R) coil temperature-resistance value correlation function" are data that are written in advance to the memory 165. Alternatively, the writing process may be executed under the control of the audio output application at a timing such as when the audio output application is started.

[0236] The "(Q) Area Identification Element Resistance Value-Reference Resistance Value Corresponding Data" stores the following data in association with each other: (a1) Resistance value of the low temperature side area identification element (Rcls0) (a2) Low temperature side reference temperature (T ０ = 25 ° C) ０ (b1) Resistance value of the high temperature range identification element (Rcls1) (b2) High temperature reference temperature (T １= 60 ° C) １ )

[0237] For example, assume that the resistance value of the low-temperature side region identifying element (Rcls0) detected by the data processing unit 160 is 5 KΩ. In this case, the data processing unit 160 calculates (a2) the low-temperature side reference temperature (T ０ = 25 ° C) ０ This is the reference resistance R applied to the control of the speaker module corresponding to the region L on the low temperature side. ０ is the reference resistance R ０ This means that the resistance is 6.076Ω.

[0238] Furthermore, the data processing unit 160 calculates the low-temperature side reference resistance R ０ = 6.076Ω is the low-temperature reference resistance R as a parameter included in the “(R) coil temperature-resistance value correlation function” ０ That is, the reference resistance R ０ to R ０ = 6.076 Ω is substituted, and the calculation process of the coil temperature T based on the resistance value (R) of the coil (speaker coil) 132 is executed.

[0239]

[0240] In the above formula (1), T ０ : Low temperature side reference temperature (=25℃) R ０ : Low temperature side reference temperature T ０ Coil resistance value (= low temperature side reference resistance R ０ = 6.076Ω) α: Coil material parameter that is a fixed value according to the coil material.

[0241] In the above formula (1), the low temperature reference temperature T ０ = 25°C Low temperature reference resistance R ０ =6.076Ω The above parameters are set, and output control for the speaker module 120L corresponding to the area L is executed.

[0242] However, this control, that is, the low-temperature side reference resistance R, which is a parameter of the "coil temperature-resistance value correlation function" shown in the above (Equation 1), ０ to R ０ The process of substituting ρ = 6.076 Ω and calculating the coil temperature T based on the resistance value (R) of the coil (speaker coil) 132 is performed when the coil temperature is on the low side. Specifically, as described above with reference to FIG. 26 , this is a control mode in the region where the coil resistance value obtained as the observation value of the data processing unit 160 is less than 6.5 Ω.

[0243] In the region where the coil resistance value obtained as the observation value of the data processing unit 160 is 6.5Ω or more, the data processing unit 160 calculates (b2) the high-temperature side reference temperature (T １ = 60 ° C) １ = 6.958 Ω.

[0244] That is, on the high temperature side, the reference resistance R １ , the reference resistance R １ The data processing unit 160 calculates the high temperature side reference resistance R １ = 6.958Ω is used as the parameter (high temperature reference resistance R １ That is, the reference resistance R １ to R １ = 6.958 Ω is substituted, and the calculation process of the coil temperature T based on the resistance value (R) of the coil (speaker coil) 132 is executed.

[0245]

[0246] In the above formula (2), T １ : High temperature side reference temperature (=60℃) R １ : High temperature side reference temperature T １ Coil resistance value (= high temperature side reference resistance R １ = 6.958 Ω) α: Coil material parameter that is a fixed value according to the coil material.

[0247] In the above (Equation 2), the high temperature reference temperature T １ =60℃ High temperature side reference resistance R １ =6.958Ω The above parameters are set, and output control on the high temperature side for the speaker module 120L corresponding to the area L is executed.

[0248] This control using the above (Equation 2) on the high temperature side is executed in the region where the coil resistance value obtained as the observed value by the data processing unit 160 is 6.5Ω or more, as previously described with reference to FIG.

[0249] An example of control corresponding to each area will be described with reference to Fig. 32. That is, from the "(Q) area discrimination element resistance value - reference resistance value correspondence data", the reference resistance R ０ The reference resistance R ０ is the reference resistance R, which is a parameter in the "(R) coil temperature-resistance value correlation function" ０ A control example in which the coil temperature T is calculated and controlled using the above formula will be described with reference to FIG.

[0250] 32 shows the "(R) coil temperature-resistance correlation function" as a solid line in each of regions L, T, and U. However, in all of regions L, T, and U, on the low temperature side where the coil resistance value is less than 6.5 Ω, the "coil temperature-resistance correlation function" for the low temperature side shown in (Equation 1) above is shown, and on the high temperature side where the coil resistance value is 6.5 Ω or more, the "coil temperature-resistance correlation function" for the high temperature side shown in (Equation 2) above is shown.

[0251] For example, the "coil temperature-resistance value correlation function" in region L is the solid line shown in region L, and this solid line represents the low-temperature side where the coil resistance value is less than 6.5 Ω, in the above (Equation 1), ０ = 25°C Low temperature reference resistance R ０ = 6.076Ω This is the "coil temperature-resistance value correlation function" for the low temperature side with the above parameters set.

[0252] Furthermore, on the high temperature side where the coil resistance is 6.5Ω or more, in the above (Equation 2), the high temperature side reference temperature T １ =60℃ High temperature side reference resistance R １= 6.958Ω This is the "coil temperature-resistance value correlation function" for the high temperature side with the above parameters set.

[0253] The "coil temperature-resistance value correlation function" in region T is the solid line shown in region T, and this solid line represents the low-temperature side where the coil resistance value is less than 6.5Ω, as expressed in the above (Equation 1): ０ = 25°C Low temperature reference resistance R ０ = 6.2Ω This is the "coil temperature-resistance value correlation function" for the low temperature side with the above parameters set.

[0254] Furthermore, on the high temperature side where the coil resistance is 6.5Ω or more, in the above (Equation 2), the high temperature side reference temperature T １ =60℃ High temperature side reference resistance R １ = 7.1 Ω This is the "coil temperature-resistance value correlation function" for the high temperature side with the above parameters set.

[0255] The "coil temperature-resistance value correlation function" in region U is the solid line shown in region U, and this solid line represents the low-temperature side where the coil resistance value is less than 6.5 Ω, in the above (Equation 1), ０ = 25°C Low temperature reference resistance R ０ = 6.326 Ω This is the "coil temperature-resistance value correlation function" for the low temperature side with the above parameters set.

[0256] Furthermore, on the high temperature side where the coil resistance is 6.5Ω or more, in the above (Equation 2), the high temperature side reference temperature T １ =60℃ High temperature side reference resistance R １ = 7.244Ω This is the "coil temperature-resistance value correlation function" for the high temperature side with the above parameters set.

[0257] In this way, the data processing unit 160 of the smartphone (device equipped with a speaker) 100b of this embodiment adds a different low-temperature reference resistance R according to the coil resistance value at the low-temperature reference temperature (25° C.) of the coil 132 of the speaker module 120 to the “coil temperature-resistance value correlation function” for the low-temperature side shown in the above (Equation 1) on the low-temperature side (observed coil resistance value = less than 6.5Ω). ０ The coil temperature is calculated by setting the value of , and output control for the speaker module 120 is executed.

[0258] Furthermore, on the high temperature side (observed coil resistance value = 6.5Ω or more), a different high temperature side reference resistance R according to the coil resistance value at the high temperature side reference temperature (60°C) of the coil 132 of the speaker module 120 is added to the "coil temperature-resistance value correlation function" for the high temperature side shown in (Equation 2) above. １ The coil temperature is calculated by setting the value of , and output control for the speaker module 120 is executed.

[0259] By performing such control, highly accurate control according to the actual coil temperature becomes possible. Note that, in the above-described embodiment, an example in which different "coil temperature-resistance value correlation functions" are applied to two temperature ranges, a low temperature side and a high temperature side, has been described, but a configuration in which different "coil temperature-resistance value correlation functions" are used in three or more temperature ranges may also be used.

[0260] [7. Regarding the sequence of output control processing using different "coil temperature-resistance value correlation functions" in which multiple reference resistors corresponding to multiple reference temperatures are set] Next, a description will be given of the sequence of output control processing using different "coil temperature-resistance value correlation functions" in which multiple reference resistors corresponding to multiple reference temperatures are set.

[0261] The flowcharts shown in Figures 33 to 35 are processes executed under the control of the data processing unit 160 of the smartphone 100b shown in Figure 30, and are a sequence of output control processes using different "coil temperature-resistance value correlation functions" in which multiple reference resistances corresponding to multiple reference temperatures are set.

[0262] The following describes the processing of each step in the flowcharts shown in Figures 33 to 35. (Step S401) First, in step S401, the smartphone is started up.

[0263] (Step S402) Next, in step S402, the data processing unit 160 of the smartphone 100 detects the resistance values ​​of the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b.

[0264] 30 , a predetermined current is supplied via ADCs (analog-to-digital converters) 162a and 162b to the low-temperature side zone identification element (Rcls0) 150a and the high-temperature side zone identification element (Rcls1) 150b mounted in the speaker module 120. In addition, the voltages of the output sections of the ADCs (analog-to-digital converters) 162a and 162b are maintained at a constant voltage by pull-up resistors (Rpu0,1) 164a and 164b connected to the bias output section 163.

[0265] The data processing unit 160 calculates the resistance values ​​of the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b based on the voltage and current supplied to the low temperature side area identification element (Rcls0) 150a and the high temperature side area identification element (Rcls1) 150b.

[0266] The low-temperature side region identification element (Rcls0) 150a is set to a resistance value (either 5KΩ, 10KΩ, or 15KΩ) corresponding to each region (L, T, U) determined according to the coil resistance value at the low-temperature side reference temperature (e.g., 25°C) of the coil (speaker coil) 132.

[0267] The high temperature side region identification element (Rcls1) 150b is set to a resistance value (either 5KΩ, 10KΩ, or 15KΩ) corresponding to each region (L, T, U) determined according to the coil resistance value at the high temperature side reference temperature (e.g., 60°C) of the coil (speaker coil) 132.

[0268] (Step S403) Next, in step S403, the data processing unit 160 of the smartphone 100 writes the resistance values ​​of the low temperature side area identification element (Rcls0) and the high temperature side area identification element (Rcls1) to the recording area of ​​the memory 165 for “(P) area identification element resistance value.”

[0269] As previously described with reference to Fig. 31, the memory 165 stores the following data: (P) Resistance value of element for area discrimination (Q) Correspondence data of resistance value of element for area discrimination vs. reference resistance value (R) Coil temperature vs. resistance value correlation function

[0270] In step S403, a process is executed to record the resistance values ​​of the low temperature side area identification element (Rcls0) and the high temperature side area identification element (Rcls1) in the recording area of ​​"(P) area identification element resistance value".

[0271] (Step S404) Next, the data processing unit 160 of the smartphone 100 starts driving the speaker in step S404 and executes a process of detecting the resistance value R of the coil (speaker coil) 132.

[0272] Specifically, power is supplied to the coil (speaker coil) 132 of the speaker module 120 via an amplifier 161 configured as shown in Fig. 30. This power supply causes the diaphragm 131 of the speaker module 120 to vibrate, and sound is output.

[0273] During the period in which this audio output is being performed, the data processing unit 160 measures changes in the voltage and current output to the coil (speaker coil) 132 via the amplifier 161, and calculates and monitors the resistance value of the coil (speaker coil) 132 based on the voltage and current output to the coil (speaker coil) 132.

[0274] (Step S405) Next, in step S405, the data processing unit 160 of the smartphone 100 determines whether the resistance value of the coil (speaker coil) 132 calculated in step S404 is equal to or greater than a specified threshold value.

[0275] This is a determination process based on the threshold value (6.5Ω) previously described with reference to FIG. 26 etc. If the resistance value (R) of the coil (speaker coil) 132 of the speaker module 120 detected by the data processing unit 160 of the smartphone 100 is less than 6.5Ω, control is executed using the "coil temperature-resistance value correlation function" shown in (Equation 1) for the low temperature side, and if the resistance value (R) of the coil (speaker coil) 132 is 6.5Ω or higher, control is executed using the "coil temperature-resistance value correlation function" shown in (Equation 2) for the high temperature side. The determination process of step S403 is a determination process for determining which of these control methods to execute.

[0276] If it is determined that the resistance value of the coil (speaker coil) 132 is less than the specified threshold value, the process proceeds to step S411. On the other hand, if it is determined that the resistance value of the coil (speaker coil) 132 is equal to or greater than the specified threshold value, the process proceeds to step S421.

[0277] (Step S411) If it is determined in step S405 that the resistance value of the coil (speaker coil) 132 is less than the specified threshold value, the processes of steps S411 and S412 are executed.

[0278] The result of the determination that the resistance value of the coil (speaker coil) 132 is less than the specified threshold value means that the coil temperature is on the low temperature side, and the low temperature side reference resistance value R determined based on the resistance value (5 kΩ, 10 kΩ, 15 kΩ) of the low temperature side region identification element (Rcls0) is ０ is set to the "low-temperature side coil temperature-resistance value correlation equation (Equation 1)" described above, and control is performed.

[0279] First, in step S411, the data processing unit 160 of the smartphone 100 determines the low temperature side reference resistance value R of one of the regions (L, T, U) corresponding to the recorded resistance value based on the resistance value (5 kΩ, 10 kΩ, 15 kΩ) of the low temperature side region identification element (Rcls0) written in the recording region of the “(P) region identification element resistance value” of the memory 165. ０ is acquired from the “(Q) Area Identification Element Resistance Value-Reference Resistance Value Correspondence Data” in the memory 165.

[0280] (Step S412) In step S411, the low temperature side reference resistance value R of any of the regions (L, T, U) is determined from the "(Q) region identification element resistance value-reference resistance value correspondence data" in the memory 165. ０ After obtaining the resistance value correlation equation (Equation 1) for the low temperature side, the data processing unit 160 of the smartphone 100 then starts output control for the speaker module 120 in step S412 in accordance with the coil temperature-resistance value correlation equation (Equation 1) for the low temperature side described above.

[0281] That is, the coil temperature T is calculated based on the resistance value (R) of the coil (speaker coil) 132 according to the following (Equation 1) described above, and the output of the speaker module 120 is controlled according to the calculation result.

[0282]

[0283] In the above formula (1), T ０ : Low temperature reference temperature (e.g., 25°C) R ０ : Low temperature side reference temperature T ０ Coil resistance value (= low temperature side reference resistance R ０ ) α: Coil material parameter, which is a fixed value depending on the coil material.

[0284] In addition, the low temperature side reference resistance R ０ The value of will be different for each of the three types of smartphones: smartphones compatible with area L, smartphones compatible with area T, and smartphones compatible with area U, and different controls will be executed for each.

[0285] The different low-temperature reference resistances R of these three types of smartphones ０ The specific control process using the low-temperature side coil temperature-resistance correlation equation, in other words, the following (Equation 1) described above, is similar to the process described above with reference to FIG. 23.

[0286] Next, with reference to the flowchart shown in FIG. 35, a process will be described in which it is determined in step S405 of the flow shown in FIG. 33 that the resistance value of the coil (speaker coil) 132 is equal to or greater than the specified threshold value.

[0287] (Step S421) If it is determined in step S405 that the resistance value of the coil (speaker coil) 132 is equal to or greater than the specified threshold value, the processes of steps S421 and S422 are executed.

[0288] The result of the determination that the resistance value of the coil (speaker coil) 132 is equal to or greater than the specified threshold value means that the coil temperature is on the high temperature side, and the high temperature side reference resistance value R determined based on the resistance value (5 kΩ, 10 kΩ, 15 kΩ) of the high temperature side region identification element (Rcls1) is １ is set to the "high temperature side coil temperature-resistance value correlation equation (Equation 2)" described above, and control is performed.

[0289] First, in step S421, the data processing unit 160 of the smartphone 100 determines the high temperature side reference resistance value R of one of the areas (L, T, U) corresponding to the recorded resistance value based on the resistance value (5 kΩ, 10 kΩ, 15 kΩ) of the high temperature side area identification element (Rcls1) written in the recording area of ​​the “(P) area identification element resistance value” of the memory 165. １ is acquired from the “(Q) Area Identification Element Resistance Value-Reference Resistance Value Correspondence Data” in the memory 165.

[0290] (Step S422) In step S421, the high temperature side reference resistance value R of any of the regions (L, T, U) is determined from the "(Q) region identification element resistance value-reference resistance value correspondence data" in the memory 165. １ After obtaining the resistance value correlation equation (Equation 2) for the high-temperature side, the data processing unit 160 of the smartphone 100 then starts output control for the speaker module 120 in step S422 in accordance with the resistance value correlation equation (Equation 2) for the high-temperature side.

[0291] That is, the coil temperature T is calculated based on the resistance value (R) of the coil (speaker coil) 132 according to the following (Equation 2) described above, and the output of the speaker module 120 is controlled according to the calculation result.

[0292]

[0293] In the above formula (2), T １ : Higher reference temperature (e.g., 60°C) R １ : High temperature side reference temperature T １ Coil resistance value (= high temperature side reference resistance R １ ) α: Coil material parameter, which is a fixed value depending on the coil material.

[0294] In addition, the high temperature side reference resistance R １ The value of will be different for each of the three types of smartphones: smartphones compatible with area L, smartphones compatible with area T, and smartphones compatible with area U, and different controls will be executed for each.

[0295] In this way, the data processing unit 160 of the smartphone (device equipped with a speaker) 100b of this embodiment adds a different low-temperature reference resistance R according to the coil resistance value at the low-temperature reference temperature (25° C.) of the coil 132 of the speaker module 120 to the “coil temperature-resistance value correlation function” for the low-temperature side shown in the above (Equation 1) on the low-temperature side (observed coil resistance value = less than 6.5Ω). ０ The coil temperature is calculated by setting the value of , and output control for the speaker module 120 is executed.

[0296] Furthermore, on the high temperature side (observed coil resistance value = 6.5Ω or more), a different high temperature side reference resistance R according to the coil resistance value at the high temperature side reference temperature (60°C) of the coil 132 of the speaker module 120 is added to the "coil temperature-resistance value correlation function" for the high temperature side shown in (Equation 2) above. １ The coil temperature is calculated by setting the value of , and output control for the speaker module 120 is executed.

[0297] By performing such control, highly accurate control according to the actual coil temperature becomes possible. As mentioned above, it is also possible to configure the system to use different "coil temperature-resistance value correlation functions" in three or more temperature ranges.

[0298] 8. Hardware Configuration Example of Speaker-Equipped Device According to the Present Disclosure Next, a hardware configuration example of a speaker-equipped device such as a smartphone according to the present disclosure will be described.

[0299] FIG. 36 is a diagram illustrating an example of the hardware configuration of a speaker-equipped device according to the present disclosure.

[0300] The hardware configuration shown in Fig. 36 will be described. A CPU (Central Processing Unit) 301 functions as a control unit or data processing unit that executes various processes according to programs stored in a ROM (Read Only Memory) 302 or a storage unit 308. For example, it executes processes according to the sequences described in the above-mentioned embodiments. A RAM (Random Access Memory) 303 stores programs and data executed by the CPU 301. The CPU 301, ROM 302, and RAM 303 are interconnected by a bus 304.

[0301] The CPU 301 is connected to an input / output interface 305 via a bus 304, and an input unit 306 including various switches, a UI, a keyboard, a mouse, a microphone, a camera, etc., and an output unit 307 including a display, a speaker, etc. are connected to the input / output interface 305. The CPU 301 executes various processes in response to commands input from the input unit 306, and outputs the processed results to the output unit 307, for example.

[0302] The storage unit 308 connected to the input / output interface 305 is made up of, for example, a flash memory, a hard disk, etc., and stores various data and programs executed by the CPU 301. The communication unit 309 functions as a transmitter / receiver for data communication via Wi-Fi communication, Bluetooth (registered trademark) (BT) communication, UWB communication, and other networks such as the Internet and a local area network, and communicates with external devices.

[0303] A drive 310 connected to the input / output interface 305 drives removable media 311 such as a magnetic disk, optical disk, magneto-optical disk, or semiconductor memory such as a memory card, and executes recording or reading of data.

[0304] [9. Summary of the Configuration of the Present Disclosure] The embodiments of the present disclosure have been described above in detail with reference to specific examples. However, it is obvious that those skilled in the art can modify or substitute the embodiments without departing from the gist of the present disclosure. In other words, the present invention has been disclosed in the form of examples and should not be interpreted as being limited. To determine the gist of the present disclosure, the claims should be taken into consideration.

[0305] The technology disclosed in this specification can be configured as follows: (1) A speaker-equipped device comprising: a speaker module having a speaker and a coil for driving the speaker; and a data processing unit that controls an output current to the coil by applying a coil temperature-resistance correlation function that is a correlation equation between the temperature and resistance of the coil, wherein the data processing unit detects the resistance of an area identification element attached to the speaker-equipped device, determines parameters of the coil temperature-resistance correlation function based on the detected resistance of the area identification element, and controls the output current to the coil by applying the coil temperature-resistance correlation function in which the determined parameters are set.

[0306] (2) The speaker-equipped device described in (1), wherein the coil temperature-resistance value correlation function is a function for calculating the coil temperature based on the coil resistance value, and the data processing unit detects the resistance value of the coil and calculates the coil temperature corresponding to the detected resistance value by applying the coil temperature-resistance value correlation function, and when the calculated coil temperature reaches a specified temperature, executes control to reduce the output current to the coil.

[0307] (3) The coil temperature-resistance correlation function is ０ and the reference temperature T ０ Reference resistance R corresponding to the coil resistance value at ０ as a parameter, and the data processing unit calculates a reference resistance R which is a parameter of the coil temperature-resistance value correlation function based on the resistance value of the area identification element. ０ The speaker-equipped device according to (1) or (2), wherein the value of

[0308] (4) The speaker-mounted device is configured to: ０ The data processing unit refers to the area discrimination element resistance value-reference resistance value correspondence data stored in the memory and calculates the reference resistance R corresponding to the resistance value of the area discrimination element. ０ and set the value as a parameter of the coil temperature-resistance value correlation function.

[0309] (5) The resistance value of the area identification element is a reference temperature T ０ The resistance value is determined based on the coil resistance value in the speaker-equipped device described in 3.

[0310] (6) The resistance value of the area identification element is a reference temperature T ０ The coil resistance value at the reference temperature T ０ The speaker-equipped device according to (3) or (4), wherein the element is set to different values ​​depending on whether the coil resistance is relatively low or high compared to the intermediate value of the coil resistance value in (3).

[0311] (7) The data processing unit calculates a reference temperature T ０ When the coil resistance value at is relatively low compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The value of the reference temperature T ０ When the coil resistance value at is relatively high compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The speaker-equipped device according to (6), wherein the value of is set to a large value.

[0312] (8) The resistance value of the area identification element is a reference temperature T０ (a) the reference temperature T of the coils mounted in a number of speaker-mounted devices ０ (b) a first resistance value corresponding to the L region when the resistance is relatively low compared to the intermediate value of the coil resistance values ​​in (a) to (c); (b) a second resistance value corresponding to the T region when the resistance is relatively approximately equal compared to the intermediate value; (c) a third resistance value corresponding to the U region when the resistance is relatively high compared to the intermediate value; and a speaker-equipped device as described in any one of (3) to (7), which is one of the three different resistance values ​​(a) to (c) above.

[0313] (9) The data processing unit calculates a reference temperature T ０ When the coil resistance value at is relatively low compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The value of the reference temperature T ０ When the coil resistance value at is approximately equal to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The reference temperature T of the coil mounted in the speaker-mounted device is set to an intermediate value. ０ When the coil resistance value at is relatively high compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The speaker-equipped device according to (8), wherein the value of is set to a large value.

[0314] (10) The speaker-equipped device according to any one of (1) to (9), wherein the data processing unit detects a resistance value of the coil attached to the speaker-equipped device, and controls an output current to the coil by applying different coil temperature-resistance correlation functions when the detected resistance value of the coil is less than a specified threshold value and when the detected resistance value is equal to or greater than a specified threshold value.

[0315] (11) The data processing unit calculates a low-temperature reference temperature T ０ and the low temperature reference temperature T０ The low-temperature reference resistance R corresponds to the coil resistance value at ０ a first correlation function including as a parameter a high-temperature side reference temperature T １ and the high temperature reference temperature T １ The high temperature reference resistance R corresponds to the coil resistance value at １ and a second correlation function including the first correlation function as a parameter.

[0316] (12) The speaker-equipped device according to (11), wherein the data processing unit detects a resistance value of the coil attached to the speaker-equipped device, and if the resistance value of the coil is less than a specified threshold value, calculates the coil temperature by applying the first correlation function, and if the resistance value of the coil is equal to or greater than a specified threshold value, calculates the coil temperature by applying the second correlation function.

[0317] (13) The speaker-equipped device according to any one of (1) to (12), wherein the area identification element is mounted inside the speaker module.

[0318] (14) The speaker-equipped device according to (13), wherein the area identification element is configured to be mounted in parallel to the speaker mounted in the speaker module.

[0319] (15) The coil temperature-resistance value correlation function is ０ and the reference temperature T ０ Reference resistance R corresponding to the coil resistance value at ０ The area discriminator is a function including a reference temperature T ０ The speaker-equipped device according to (13) or (14), wherein the element has a resistance value determined based on the measurement result of the coil resistance value in (14).

[0320] (16) A speaker output control method executed in a speaker-equipped device, the speaker-equipped device comprising: a speaker module having a speaker and a coil for driving the speaker; and a data processing unit that controls an output current to the coil by applying a coil temperature-resistance correlation function that is a correlation equation between the temperature and resistance of the coil, wherein the data processing unit detects a resistance value of an area identification element attached to the speaker-equipped device, determines parameters of the coil temperature-resistance correlation function based on the detected resistance value of the area identification element, and controls the output current to the coil by applying the coil temperature-resistance correlation function to which the determined parameters are set.

[0321] Furthermore, the series of processes described in this specification can be executed by hardware, software, or a combination of both. When executing processes by software, a program recording the processing sequence can be installed and executed in the memory of a computer incorporated in dedicated hardware, or the program can be installed and executed on a general-purpose computer capable of executing various processes. For example, the program can be pre-recorded on a recording medium. In addition to installing the program from the recording medium to the computer, the program can also be received via a network such as a LAN (Local Area Network) or the Internet and installed on a recording medium such as an internal hard disk.

[0322] The various processes described in this specification may not only be executed in chronological order as described, but may also be executed in parallel or individually depending on the processing capabilities of the devices executing the processes or as needed. Furthermore, in this specification, a system refers to a logical collective configuration of multiple devices, and is not limited to devices that are all located in the same housing.

[0323] As described above, according to the configuration of one embodiment of the present disclosure, a device and a method for performing output control according to the characteristics of each speaker coil of a speaker-equipped device are realized. Specifically, for example, a data processing unit that controls the output to the speaker coils may be configured to calculate a reference temperature T０ Reference resistance R ０ The data processing unit detects the resistance value of the area identification element attached to the speaker-mounted device, and calculates a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, based on the detected resistance value. ０ The control is performed by setting the value of , to a value corresponding to the characteristics of the speaker coil of the speaker-equipped device. With this configuration, an apparatus and method for performing output control corresponding to the characteristics of each speaker coil of the speaker-equipped device are realized.

[0324] 10 Smartphone (device equipped with speaker) 11 Display module 12 Camera module 20 Speaker module 21 Speaker enclosure 22 Speaker unit 23 Speaker sound output hole 31 Diaphragm 32 Coil (speaker coil) 33 Coil power supply unit 41 Inspection system 42 Thermometer 51 Data processing IC 52 Amplifier IC 110 Inspection system 111 Thermometer 120 Speaker module 121 Speaker enclosure 122 Speaker unit 131 Diaphragm 132 Coil (speaker coil) 133 Coil power supply unit 151 Area identification element power supply unit 160 Data processing unit (processor / controller) 161 Amplifier 162 ADC (analog-digital converter) 163 Bias output unit 164 Pull-up resistor (Rpun) 165 Memory 301 CPU 302 ROM 303 RAM 304 Bus 305 Input / output interface 306 Input unit 307 Output unit 308 Storage unit 309 Communication unit 310 Drive 311 Removable media

Claims

1. A speaker-equipped device comprising: a speaker module having a speaker and a coil for driving the speaker; and a data processing unit that controls an output current to the coil by applying a coil temperature-resistance correlation function, which is a correlation equation between the temperature and resistance of the coil, wherein the data processing unit detects the resistance of an area identification element attached to the speaker-equipped device, determines parameters of the coil temperature-resistance correlation function based on the detected resistance of the area identification element, and controls the output current to the coil by applying the coil temperature-resistance correlation function with the determined parameters set.

2. The speaker-equipped device according to claim 1, wherein the coil temperature-resistance value correlation function is a function for calculating the coil temperature based on the coil resistance value, and the data processing unit detects the resistance value of the coil and calculates the coil temperature corresponding to the detected resistance value by applying the coil temperature-resistance value correlation function, and when the calculated coil temperature reaches a specified temperature, executes control to reduce the output current to the coil.

3. The coil temperature-resistance correlation function is ０ and the reference temperature T ０ Reference resistance R corresponding to the coil resistance value at ０ as a parameter, and the data processing unit calculates a reference resistance R which is a parameter of the coil temperature-resistance value correlation function based on the resistance value of the area identification element. ０ 2. The speaker-equipped device according to claim 1, wherein the value of is determined.

4. The speaker-equipped device is ０ The data processing unit refers to the area discrimination element resistance value-reference resistance value correspondence data stored in the memory and calculates the reference resistance R corresponding to the resistance value of the area discrimination element. ０ 4. The speaker-equipped device according to claim 3, wherein the value of is acquired and set as a parameter of the coil temperature-resistance value correlation function.

5. The resistance value of the area identification element is set to a reference temperature T of the coil mounted in the speaker-mounted device. ０ 4. The speaker-mounted device according to claim 3, wherein the resistance value is determined based on the coil resistance value in 6. The resistance value of the area identification element is set to the reference temperature T of the coil attached to the speaker-mounted device. ０ The coil resistance value at the reference temperature T ０ 4. The speaker-mounted device according to claim 3, wherein the element is set to different values ​​depending on whether the coil resistance is relatively low or high compared to the intermediate value in the coil resistance value.

7. The data processing unit calculates a reference temperature T of the coil attached to the speaker-equipped device. ０ When the coil resistance value at is relatively low compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The value of the reference temperature T ０ When the coil resistance value at is relatively high compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ 7. The speaker-equipped device according to claim 6, wherein the value of is set to a large value.

8. The resistance value of the area identification element is set to the reference temperature T of the coil attached to the speaker-mounted device. ０ (a) the reference temperature T of the coils mounted in a number of speaker-mounted devices ０ (b) a first resistance value corresponding to the L region when the coil resistance is relatively low compared to the intermediate value of the coil resistance values ​​in the above (a) to (c); (b) a second resistance value corresponding to the T region when the coil resistance is relatively approximately equal compared to the intermediate value; (c) a third resistance value corresponding to the U region when the coil resistance is relatively high compared to the intermediate value.

9. The data processing unit calculates a reference temperature T of the coil attached to the speaker-equipped device. ０ When the coil resistance value at is relatively low compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The value of the reference temperature T ０ When the coil resistance value at is approximately equal to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ The reference temperature T of the coil mounted in the speaker-mounted device is set to an intermediate value. ０ When the coil resistance value at is relatively high compared to the intermediate value, a reference resistance R, which is a parameter of the coil temperature-resistance value correlation function, is calculated based on the resistance value of the region identification element. ０ 9. The speaker-equipped device according to claim 8, wherein the value of is set to a large value.

10. The speaker-equipped device according to claim 1, wherein the data processing unit detects the resistance value of the coil attached to the speaker-equipped device, and controls the output current to the coil by applying different coil temperature-resistance value correlation functions when the detected resistance value of the coil is less than a specified threshold value and when it is equal to or greater than a specified threshold value.

11. The data processing unit calculates the low-temperature reference temperature T ０ and the low temperature reference temperature T ０ The low-temperature reference resistance R corresponds to the coil resistance value at ０ a first correlation function including as a parameter a high-temperature side reference temperature T １ and the high temperature reference temperature T １ The high temperature reference resistance R corresponds to the coil resistance value at １ 11. The speaker-equipped device according to claim 10, wherein control is performed by selectively applying a second correlation function including the first correlation function as a parameter.

12. The speaker-equipped device according to claim 11, wherein the data processing unit detects the resistance value of the coil attached to the speaker-equipped device, and if the resistance value of the coil is less than a specified threshold value, applies the first correlation function to calculate the coil temperature, and if the resistance value of the coil is equal to or greater than the specified threshold value, applies the second correlation function to calculate the coil temperature.

13. The speaker-equipped device according to claim 1, wherein the area identification element is mounted within the speaker module.

14. The speaker-equipped device according to claim 13, wherein the area discrimination element is mounted in parallel to the speaker mounted in the speaker module.

15. The coil temperature-resistance correlation function is ０ and the reference temperature T ０ Reference resistance R corresponding to the coil resistance value at ０ The area discriminator is a function including a reference temperature T ０ 14. The speaker-equipped device according to claim 13, wherein the element has a resistance value determined based on the measurement result of the coil resistance value in the step (a).

16. A speaker output control method executed in a speaker-equipped device, the speaker-equipped device comprising: a speaker module having a speaker and a coil for driving the speaker; and a data processing unit that controls an output current to the coil by applying a coil temperature-resistance correlation function that is a correlation equation between the temperature and resistance of the coil, wherein the data processing unit detects the resistance of an area identification element attached to the speaker-equipped device, determines parameters of the coil temperature-resistance correlation function based on the detected resistance of the area identification element, and controls the output current to the coil by applying the coil temperature-resistance correlation function with the determined parameters set.

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