WO2011043292A1

WO2011043292A1 - Speaker-type vibration apparatus, and electronic apparatus provided with vibration function

Info

Publication number: WO2011043292A1
Application number: PCT/JP2010/067362
Authority: WO
Inventors: 瀧　良博; 義孝中嶋; 桐田　洋
Original assignee: 株式会社コト
Priority date: 2009-10-06
Filing date: 2010-10-04
Publication date: 2011-04-14

Abstract

Disclosed is a vibration apparatus which is suitable for an electronic apparatus, has excellent response characteristics and is low-cost, light-weight and compact. The speaker-type vibration apparatus (4) is provided with: a magnetic circuit having a magnetic space (14); a voice coil (16) disposed in the magnetic space (14); and a vibration plate (20) fixed to the voice coil (16). The vibrating plate (20) is provided with a hole (20b) and a weight (18) such that the resonance frequency is within a range of 30-300Hz.

Description

Speaker type vibration device and electronic device with vibration function

The present invention relates to a speaker-type vibration device and an electronic apparatus with a vibration function including the same.

2. Description of the Related Art Conventionally, information is presented to a user using vibration in a portable electronic device such as a mobile phone, a controller of a game machine, and the like. In a conventional electronic device having a vibration function, an eccentric motor is often used as a device for generating vibration (see, for example, Patent Document 1).

JP 2009-206857 A

However, due to the nature of rotating the eccentric weight, the eccentric motor has a delay of several tens of milliseconds with respect to the response to the signal, and the response to the strength of the signal is not good. In particular, when considering the responsiveness to an audio signal, the vibration delayed by 5 milliseconds or more does not harmonize the audio and the vibration and only gives an unpleasant feeling. In addition, the vibration device used in the so-called body acoustic device is expensive and heavy, and thus cannot be used for a portable device or a game machine.

The present invention has been made in view of such points, and an object of the present invention is to provide a vibration device that is suitable for electronic equipment, has excellent responsiveness, is inexpensive, lightweight, and compact.

A speaker-type vibration device according to the present invention includes a magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm fixed to the voice coil, and a weight is provided on the diaphragm. It is what was done.

Another speaker-type vibration device according to the present invention includes a magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm fixed to the voice coil, and the diaphragm has a hole. Is formed.

An electronic device with a vibration function according to the present invention includes a speaker including a magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, a diaphragm fixed to the voice coil, and the speaker-type vibration. And a signal processing circuit that receives an input signal related to sound and outputs a signal to each voice coil of the speaker and the speaker-type vibration device in accordance with the input signal. The signal processing circuit outputs another signal for audio based on the input signal that is the same as or based on the input signal to the voice coil of the speaker, and includes a frequency component of 30 Hz to 300 Hz from the input signal and the input signal. A signal synchronized with the signal is extracted or generated, and the signal is output to the voice coil of the speaker type vibration device.

According to the present invention, it is possible to provide a vibration device that is suitable for electronic equipment, has excellent responsiveness, is inexpensive, lightweight, and compact. In addition, it is possible to realize an electronic device with a vibration function including a vibration device with excellent response.

1 is a perspective view of an electronic device with a vibration function according to Embodiment 1. FIG. (A) is a plan view of the speaker-type vibration device, and (b) is a sectional view taken along line IIb-IIb in (a). It is a top view of the diaphragm which concerns on a modification. It is sectional drawing of the speaker-type vibration apparatus which concerns on a modification. It is a graph showing the vibration characteristic of a speaker and a speaker type vibration apparatus. It is a graph showing the sound pressure characteristic of a speaker and a speaker type vibration apparatus. It is explanatory drawing of a signal processing circuit. It is a block diagram which shows an example of a signal processing circuit. (A) is a waveform diagram of an input signal, (b) is a waveform diagram of a signal output from a low frequency transmitter, and (c) is a waveform diagram of an output signal output to a speaker-type vibration device. It is a block diagram which shows the other example of a signal processing circuit. (A) is a waveform diagram of an input signal, and (b) is a waveform diagram of an output signal output to a speaker-type vibration device. It is a block diagram which shows the other example of a signal processing circuit. It is a perspective view of the electronic device with a vibration function which concerns on Embodiment 2. FIG. FIG. 6 is a circuit diagram of an electronic device with a vibration function according to a fourth embodiment. (A) is a waveform diagram of a PWM signal generated by the signal processing circuit, and (b) and (c) are waveform diagrams of a drive signal supplied to the voice coil. (A) is a graph showing the sensitivity characteristics of the pachini body, (b) is a graph showing the vibration characteristics of the entire electronic device, and (c) is a graph showing the sensitivity characteristics that the user receives from the electronic device. It is a figure explaining the use condition of the electronic device with a vibration function which concerns on Embodiment 5. FIG.

<Embodiment 1>
As shown in FIG. 1, an electronic device with a vibration function (hereinafter simply referred to as an electronic device) 1 includes a housing 2 that can be held, a speaker 3, and a speaker-type vibration device (hereinafter simply referred to as a vibration device) 4. I have. Here, “grasping is possible” means that a human can hold it with one hand. However, the electronic device 1 is not limited to the one used in a gripped state, and may be used in a state of being stored in a breast pocket or the like. The speaker 3 and the vibration device 4 are attached inside the housing 2. The housing 2 is provided with a display device 5 and an input device 6 composed of a plurality of buttons. The type of the display device 5 is not limited at all, and for example, a liquid crystal display device, an organic EL display device, or the like can be used. The type of the input device 6 is not limited at all, and may be a device other than a button. For example, a touch pad, a joystick or the like can be used as the input device 6. The input device 6 may be integrated with the display device 5 as a touch panel. The electronic device 1 is only an example of the electronic device with a vibration function of the present invention. The electronic device with a vibration function according to the present invention may not include a display device and may not include an input device. The use of the electronic device with a vibration function is not limited at all, and may be a portable electronic device such as a portable game machine, a portable phone, and a portable music player, and connected to the game main body so that it can be wired or wirelessly communicated. It may be a game controller or the like.

The vibration device 4 generates low-frequency vibration while suppressing generation of sound by improving the diaphragm of the speaker. 2A is a plan view of the vibration device 4, and FIG. 2B is a cross-sectional view of the vibration device 4. FIG. The vibration device 4 includes a frame 11, a magnet 12 disposed at the bottom of the frame 11, and a center pole 13 placed on the magnet 12. The magnet 12 and the center pole 13 are formed in a disk shape. The frame 11 and the center pole 13 are made of pure iron, and a magnetic gap 14 is formed between the inner peripheral surface of the frame 11 and the outer peripheral surface of the center pole 13. The frame 11, the magnet 12, and the center pole 13 constitute a magnetic circuit having a magnetic gap 14. A voice coil 16 wound around a bobbin 15 is disposed in the magnetic gap 14. The voice coil 16 is fixed to the diaphragm 20 via the bobbin 15. A ring member 17 is fitted into the frame 11, and a peripheral edge portion 20 a of the diaphragm 20 is sandwiched between the ring member 17 and the frame 11. Thereby, the diaphragm 20 is fixed to the frame 11.

As shown in FIG. 2A, the diaphragm 20 has a plurality of holes 20b. The position, size, number, and the like of the holes 20b are not particularly limited. In the present embodiment, twelve round holes 20b are evenly arranged in the circumferential direction inside the peripheral edge 20a. The shape and dimensions of each hole 20b are the same, but they may be different. The diaphragm 20 has a flat plate-shaped central portion 20c and a mountain-shaped damper portion 20d located between the central portion 20c and the peripheral edge portion 20a. The hole 20b is formed in the damper portion 20d. The diaphragm 20 is formed in a substantially flat plate shape with the peripheral edge 20a supported. The hole 20b of the diaphragm 20 is formed for the purpose of shifting the resonance frequency to a low frequency band and suppressing the generation of sound pressure.

By the way, it is known that human skin is equipped with a Pacini body, a Meissner body, a Merkel board, and a Rufini body as mechanoreceptors. Among these, the Pacini body and the Meissner body are receptors that react quickly, and in particular, the Meissner body is known to have high sensitivity in the vicinity of 30 Hz, and the Pacini body has a high sensitivity in a low frequency band of 100 Hz to 300 Hz. . Experience has shown that applying a 30 Hz to 300 Hz vibration can effectively stimulate a rapidly responding receptor. It has been difficult to effectively output such a low frequency with a conventional speaker mounted on a portable electronic device or the like. However, in the speaker-type vibration device 4, the resonance frequency can be lowered by forming the hole 20 b in the diaphragm 20 or attaching a weight, so that the Patini body and the Meissner body are effectively stimulated. It has become possible to sufficiently output the low frequency that can be used. Specifically, it has become possible to sufficiently output a low frequency of 30 Hz to 300 Hz, which is said to effectively stimulate the Meissner body or Patini body.

In this embodiment, the resonance frequency is lowered by providing the diaphragm 20 with the round hole 20b. However, the same object can be achieved by other methods. For example, as shown in FIG. 3, a slit hole 20e may be provided in the diaphragm 20 instead of the round hole 20b. In the example shown in FIG. 3, slit holes 20 e extending radially are formed in the damper portion 20 d of the diaphragm 20. The cross-sectional shape of the diaphragm 20 is the same as that of the diaphragm 20 shown in FIG. Moreover, you may form diaphragm 20 itself with a porous body. In other words, the diaphragm 20 may be provided with a large number of small holes. Further, as shown in FIG. 4, the weight 18 may be fixed to the diaphragm 20 without providing the hole 20b. In the example shown in FIG. 4, a disk-shaped weight 18 is fixed on the central portion 20 c of the diaphragm 20. The fixing method of the weight 18 is not limited at all. For example, the weight 18 may be bonded to the diaphragm 20 or may be fitted into the diaphragm 20. Further, the diaphragm 20 may be provided with a hole 20b and the weight 18 may be fixed. In addition, the “hole” in the present specification is not limited to a hole surrounded by the periphery, and may be a hole in which a part of the periphery is opened. A hole may be formed in the weight 18. The weight 18 and the diaphragm 20 may be provided with holes penetrating them, and air may be allowed to flow between the upper side of the weight 18 and the lower side of the diaphragm 20 through these holes. That is, air escape holes may be formed in the weight 18 and the diaphragm 20.

Note that the hole 20b has a large effect of suppressing air vibrations, and thus has a large effect of suppressing sounds in the middle and high range. In addition, since the amplitude is large in the low sound range, the diaphragm 20 needs to swing greatly. In a normal speaker, a soft material that exhibits a damper effect is used around the diaphragm. However, since the vibration device 4 of the present embodiment uses an inexpensive and compact speaker, the diaphragm 20 is made of a single material, and the central portion 20c, the damper portion 20d, and the peripheral portion 20a are the same material. It is formed with. Therefore, in order to provide a damper effect without providing the hole 20b or the like, the diaphragm 20 needs to be softened or thinned. However, if the diaphragm 20 is too soft, the diaphragm 20 may not vibrate well. Further, if the diaphragm 20 is to be thinned, the diaphragm 20 tends to be expensive. Therefore, in this embodiment, by adopting a simple method of forming the hole 20b in the diaphragm 20, the resonance frequency is lowered and the amplitude of the diaphragm 20 is gained.

In this embodiment, the diaphragm 20 is made of PET (polyethylene terephthalate). However, the diaphragm 20 may be formed of other materials such as cotton impregnated with PEI (polyetherimide), paper, and phenol resin. The material of the diaphragm 20 is not particularly limited. The material of the weight 18 is not particularly limited. For example, a metal or the like can be used as the material of the weight 18. In this embodiment, the weight 18 is made of metal, the diaphragm 20 is made of resin, and the weight 18 and the diaphragm 20 are separate. However, the weight 18 may be integrated with the diaphragm 20. The weight 18 and the diaphragm 20 may be formed from the same material. The weight 18 and the diaphragm 20 may be integrally formed.

The speaker 3 is the same as the above-described vibration device 4 in which the diaphragm 20 is not provided with the hole 20b. Since the configuration other than the diaphragm 20 is the same as that of the vibration device 4, a detailed description of the speaker 3 is omitted.

FIG. 5 is a graph showing the vibration characteristics of the speaker 3 and the vibration device 4. The horizontal axis of the graph of FIG. 5 represents the frequency, with 30 Hz to 300 Hz being 10 Hz intervals, 300 Hz to 1 kHz being 100 Hz intervals, and 1 kHz to 10 kHz being 1 kHz intervals. The vertical axis represents the amplitude level. A shows the speaker 3, B shows the vibration device 4 in which the weight 18 is fixed to the vibration plate 20, and C shows the vibration device 4 in which the hole 20 b is formed in the vibration plate 20 and the weight 18 is fixed. From FIG. 5, it can be seen that, in the frequency band of 30 Hz to 300 Hz, the speaker 3 does not vibrate substantially while the vibration device 4 vibrates. The resonance frequency of B is about 210 Hz, the resonance frequency of C is about 190 Hz, and it can be seen that the resonance frequency is shifted to a lower frequency by further providing a hole 20 b in the diaphragm 20 to which the weight 18 is fixed. .

FIG. 6 is a graph showing the sound pressure characteristics of the speaker 3 and the vibration device 4. The horizontal axis of the graph in FIG. 6 represents frequency, and the vertical axis represents sound pressure. As in FIG. 5, A indicates the speaker 3, B indicates the vibration device 4 in which the weight 18 is fixed to the vibration plate 20, and C indicates the vibration device 4 in which the hole 20 b is formed in the vibration plate 20 and the weight 18 is fixed. . From FIG. 6, it can be seen that in the speaker 3 of A, the sound pressure rises from above 300 Hz, and the sound pressure is generated in a relatively wide frequency band. The A speaker 3 does not generate sound pressure in the frequency band of about 300 Hz or less, the B vibration device 4 does not generate sound pressure in the frequency band of about 3 kHz or less, and the C vibration device 4 has about 5 kHz. It can be seen that the sound pressure is suppressed in the following frequency bands. That is, it can be seen that the resonance frequency is lowered by providing the weight 18 on the diaphragm 20, the output of the midrange sound is suppressed, and the output of the midrange sound is further suppressed by providing the hole 20b.

A signal processing circuit 7 is provided inside the housing 2. As shown in FIG. 7, the signal processing circuit 7 receives an input signal S1 related to sound, and outputs a signal S2 to the speaker 3 (specifically, the voice coil 16 of the speaker 3) based on the input signal S1, and the vibration device 4 (specifically, the voice coil 16 of the vibration device 4) outputs a signal S3. The signal S2 is a signal related to sound for generating sound from the speaker 3, and the signal S3 is a signal for vibrating the vibration device 4. The signals S2 and S3 may be digital signals or analog signals.

FIG. 8 is a block diagram showing an example of the signal processing circuit 7. In this example, the input signal S1 is output to the speaker 3 as it is as the output signal S2.

On the other hand, the filter 32 extracts a component of a predetermined frequency band from the input signal S1, and the sound pressure measuring unit 33 measures the sound pressure per unit time (for example, average sound pressure) of the extracted component. The component extracted by the filter 32 is a component in a frequency band desired to be transmitted as vibration, and can be set arbitrarily. The type of the filter 32 is not limited at all. For example, a low-pass filter that extracts only components below a predetermined frequency, a specific frequency component decomposed by using FFT, or a plurality of frequency components is extracted. A filter or the like can be used. The component extracted by the filter 32 may be output to the sound pressure measurement unit 33 after being amplified by an amplifier or the like. In the present embodiment, components of a predetermined frequency band are extracted from the input signal S1, but instead of extraction by the filter 32, the frequency of the input signal S1 may be shifted to a predetermined frequency band. In this case, the sound pressure measurement unit 33 measures the sound pressure of the frequency-shifted signal.

The low frequency transmitter 31 outputs a low frequency signal that effectively stimulates the Pachiny body and the Meissner body, that is, a signal of 30 Hz to 300 Hz. The signal output from the low frequency transmitter 31 may be a sine wave signal or a rectangular wave signal.

The volume adjustment unit 34 adjusts the sound pressure of the signal output from the low-frequency transmitter 31 so as to be proportional to the sound pressure measured by the sound pressure measurement unit 33. Thereby, the adjusted signal S3 becomes a signal synchronized with the signal S2. Note that the adjustment method by the volume adjustment unit 34 is not limited to a method in which the sound pressure of the signal output from the low-frequency transmitter 31 is proportional to the sound pressure measured by the sound pressure measurement unit 33. For example, the sound pressure measurement unit Other methods such as a method of calculating the logarithm of the sound pressure measured at 33 and making it proportional thereto may be used.

9A to 9C show examples of waveform diagrams of each signal, FIG. 9A shows an input signal S1, FIG. 9B shows a signal output from the low-frequency transmitter 31, and FIG. 9 (c) represents the waveform of the output signal S3. In other words, FIG. 9A shows the original waveform, FIG. 9B shows the vibration waveform, and FIG. 9C shows the adjusted waveform.

In the example of the signal processing circuit 7 described above, the same signal as the input signal S1 is output to the speaker 3 as the output signal S2. However, the signal S2 output to the speaker 3 may not be the same as the input signal S1, and may be a signal subjected to some processing. That is, the output signal S2 may be another audio signal based on the input signal S1.

As described above, the signal S3 synchronized with the signal S2 output to the speaker 3 is output to the vibration device 4, and the vibration device 4 generates vibration corresponding to the sound output from the speaker 3.

The configuration of the signal processing circuit 7 is not limited to the above example. FIG. 10 is a block diagram illustrating another example of the signal processing circuit 7. Also in this example, the input signal S1 is output to the speaker 3 as it is as the output signal S2. The filter 35 extracts a component of a predetermined frequency band from the input signal S1, and amplifies it. That is, the input signal S1 is filtered. The frequency shift unit 36 shifts the frequency of the filtered signal to near the resonance frequency of the vibration device 4. Then, the frequency-shifted signal S3 is output to the vibration device 4. The signal S3 is a signal synchronized with the signal S2. Therefore, the vibration device 4 generates vibration corresponding to the sound output from the speaker 3. FIG. 11A illustrates an example of a waveform diagram of the input signal S1, and FIG. 11B illustrates an example of a waveform diagram of the output signal S3.

FIG. 12 is a block diagram showing another example of the signal processing circuit 7. Also in this example, the input signal S1 is output to the speaker 3 as it is as the output signal S2. The filter 35 performs filtering of the input signal S1 by selecting a part of the frequency band to be transmitted as vibration. The input level measurement unit 37 measures the input level of the filtered signal, that is, the sound pressure. The vibration generation unit 38 outputs an output signal S3 for vibration to the vibration device 4 with the sound pressure reaching a predetermined value or more as a trigger. The vibration generation unit 38 may output a vibration signal prepared in advance regardless of the input signal S1 to the vibration device 4, and generates a vibration signal from the input signal S1 and outputs it to the vibration device 4. You may make it do. Thus, in this example, when the input level of the filtered signal becomes a predetermined value or higher, the vibration device 4 is vibrated in synchronization with the input level. According to this example, when a music signal is input as the input signal S1, vibration occurs at an interval when the low-pitched portion extracted by the filter 35 reaches a sound pressure of a certain value or more at a certain interval. Therefore, it is possible to generate vibration that matches the rhythm of the music.

As described above, the electronic device 1 includes the display device 5 (see FIG. 1). The display device 5 displays an image synchronized with the sound output from the speaker 3. Since the sound of the speaker 3 and the vibration of the vibration device 4 are synchronized, the image of the display device 5, the sound of the speaker 3 and the vibration of the vibration device 4 are eventually synchronized with each other. For example, when an image in which a certain object collides with another object is displayed on the display device 5 as a moving image, a collision sound is output from the speaker 3 at the moment of the collision, and a vibration simulating the collision is applied from the vibration device 4. . Thereby, although it is the small electronic device 1, the expression full of the realism is realizable.

As described above, according to the vibration device 4, the low frequency (stimulating the Pacini body and the Meissner body while using the structure of an inexpensive and small speaker is devised by forming the hole 20 b in the diaphragm 20. For example, vibration of 30 Hz to 300 Hz) can be effectively generated. Since the vibration device 4 uses a speaker structure instead of an eccentric motor, the response to signal strength is high. Therefore, a vibration device that is small, light, inexpensive, and excellent in responsiveness can be realized.

In the vibration device 4 according to the present embodiment, the plurality of holes 20b are arranged in the circumferential direction inside the peripheral edge portion 20a of the diaphragm 20. As described above, by forming the plurality of holes 20b near the supported portion (that is, the peripheral edge portion 20a), it is possible to suppress the mid-range sound output from the diaphragm 20, and the diaphragm. By reducing the area of 20, the amplitude can be increased, and the resonance frequency can be shifted to a low frequency band with a stable configuration.

Further, according to the present embodiment, low-frequency vibration that stimulates the Pachiny body or the Meissner body is generated by a simple configuration in which a speaker with a small diameter is used and the weight 18 is added to the diaphragm 20. Can do. With such a configuration, it is possible to realize a vibration device that is small, lightweight, inexpensive, and excellent in responsiveness.

If the weight 18 is fixed to the center portion 20c of the diaphragm 20, the weight 18 can be disposed at a position relatively far from the support portion (that is, the peripheral edge portion 20a) of the diaphragm 20. Thereby, since the vibration of the diaphragm 20 is stably output without distortion, the resonance frequency can be shifted to a low frequency band with a simple configuration.

According to the electronic apparatus 1 according to the present embodiment, the sound from the speaker 3 and the vibration from the vibration device 4 can be synchronized, and a rich expression that cannot be realized only by sound can be realized. Conventionally, it has been difficult to express a low frequency sound having a frequency of 300 Hz or less with a small speaker. However, by using the speaker-type vibration device 4, the low frequency can be expressed in the form of vibration. As a result, the user can actually feel not only the high and middle sound range but also the low frequency sound by vibration, and even with the small electronic device 1, a realistic expression is possible. In addition, for example, a voice of a bird that could not be grasped as a vibration until now, a stream of a stream, and the like can be expressed as vibrations, and these can be realized through human vibration nerves. According to the electronic apparatus 1 according to the present embodiment, a completely new user interface can be realized.

Further, according to the electronic apparatus 1 according to the present embodiment, in addition to the sound from the speaker 3 and the vibration from the vibration device 4, the image on the display device 5 can be synchronized. The sensation that humans are susceptible to is first visual, then tactile, and then auditory. For example, when a golf game is played with the electronic device 1, a sense of reality is increased by synchronizing the image and sound at the moment of hitting the ball and giving a highly responsive vibration to the hand. By synchronizing these three types of feelings, a new user interface can be realized in portable electronic devices, game controllers, and the like.

<Embodiment 2>
As shown in FIG. 13, the electronic device 8 with a vibration function according to the second embodiment is such that a speaker and a vibration device are each made stereo. That is, the electronic device 8 according to the present embodiment includes a left speaker 3L and a right speaker 3R, a left vibration device 4L, and a right vibration device 4R. The configuration of each

speaker

3L, 3R is the same as that of the speaker 3 of the first embodiment, and the configuration of each

vibration device

4L, 4R is the same as that of the vibration device 4 of the first embodiment. Parts similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Stereo signals are input to the

speakers

3L and 3R and the

vibration devices

4L and 4R, respectively. Here, the “stereo signals” are a pair of signals synchronized with each other and input to the left and

right speakers

3L, 3R, etc. for the purpose of producing a three-dimensional effect. The left vibration device 4L generates vibration synchronized with the sound output from the left speaker 3L. The right vibration device 4R generates vibrations synchronized with the sound output from the right speaker 3R. For this reason, the pair of left and

right vibration devices

4L and 4R generate stereo-ized vibrations in the same manner as the pair of left and

right speakers

3L and 3R output stereo sound.

In conventional electronic devices, the stereo effect can be obtained exclusively with respect to sound, but according to the present embodiment, the stereo effect can also be obtained with respect to vibration. Therefore, a stereo sense can be obtained in both auditory sense and tactile sense, and a more realistic expression is possible.

The electronic apparatus 8 according to the present embodiment includes the display device 5, the

speakers

3L and 3R, and the

vibration devices

4L and 4R. However, the display device 5 is omitted, and the

speakers

3L and 3R and the vibration device are included. Only 4L and 4R may be provided. Further, the display device 5 and the

speakers

3L and 3R may be omitted, and only the

vibration devices

4L and 4R may be provided.

<Embodiment 3>
The electronic device with a vibration function according to the third embodiment applies not only a simple vibration but also a pseudo inertial force to a human skin mechanical receptor. As shown in FIG. 14, the electronic apparatus according to this embodiment includes a signal processing circuit 41 and a drive circuit 42 that drives the vibration device 4. As the vibration device 4, the various vibration devices described in the first embodiment can be used. That is, a vibration device in which a hole is formed in the vibration plate 20, a vibration device in which the weight 18 is fixed to the vibration plate 20, or a vibration device in which a hole is formed in the vibration plate 20 and the weight 18 is fixed is used. Can do.

The drive circuit 42 includes four transistors Tr1, Tr2, Tr3, Tr4 made of FET (Field Effect Transistor) and the like, and an H-type bridge circuit is configured by these transistors Tr1, Tr2, Tr3, Tr4. The direction of the current applied to the voice coil 16 of the vibration device 4 is determined by appropriately switching ON / OFF of the transistors Tr1, Tr2, Tr3, Tr4.

The signal processing circuit 41 receives a command from the CPU 40 and generates a PWM signal. FIG. 15A shows an example of a PWM signal generated by the signal processing circuit 41. The signal processing circuit 41 generates a plurality of pulses that gradually decrease after the pulse width gradually increases during one cycle. Here, the signal processing circuit 41 generates ten pulses P1 to P10 in one cycle. In the pulses P1 to P5, the pulse width gradually increases. On the other hand, in the pulses P6 to P10, the pulse width gradually decreases. As shown in FIG. 15C, while the pulses P1 to P5 are output, the transistors Tr1 and Tr4 are turned off and the transistors Tr2 and Tr3 are turned on. As a result, the voice coil 16 is attracted to one side, and the diaphragm 20 is deformed to one side. On the other hand, as shown in FIG. 15B, while the pulses P6 to P10 are output, the transistors Tr1 and Tr4 are turned on and the transistors Tr2 and Tr3 are turned off. As a result, the voice coil 16 is attracted to the other side, and the diaphragm 20 is deformed to the other side.

The diaphragm 20 is gradually deformed toward one side by receiving the pulses P1 to P5. However, when the transistors Tr1 to Tr4 are switched and the pulse P6 is received, the diaphragm 20 is rapidly deformed to the other side. That is, the vibration plate 20 changes the direction of deformation abruptly. Then, the pulses P6 to P10 cause the diaphragm 20 to gradually deform toward the other side while slowing the deformation speed. After the pulse P10, the transistors Tr1 to Tr4 are switched again, and the diaphragm 20 receives the pulse P1 again. At this time, the vibration plate 20 changes the direction of deformation from the other side to the one side, but the change in the direction is performed gently.

As described above, according to the present embodiment, the deformation of the diaphragm 20 from one side to the other side is abruptly performed, but the deformation from the other side to the one side is performed gently. Thereby, not only vibration but a pseudo inertial force toward the other side can be given to the user.

Note that the signal given to the diaphragm 20 is not limited to the examples shown in FIGS. If the forward signal and the backward signal of the deformation are asymmetrical, a difference can be provided in the deformation mode of the diaphragm 20 between the forward route and the backward route. Thereby, it becomes possible to give a pseudo inertia force to the mechanical receptor of human skin. The mechanoreceptors of human skin are sensitive to fast movements, but slow movements are difficult to perceive, so a sensory effect can be expected beyond this physical difference.

In order to give a stronger inertial force, it is effective to drive with a low frequency that effectively stimulates the Pacini body and the Meissner body, that is, 30 Hz to 300 Hz. Depending on the specific configuration of the apparatus, it is preferable to select a frequency that can enhance the asymmetry. However, when the vibration device 4 has poor responsiveness and cannot be driven asymmetrically at 30 Hz to 300 Hz, a frequency of less than 30 Hz may be used.

Also, a continuous signal may be added to give a strong inertial force. Furthermore, more effective stimulation can be given by making it possible to change the time for applying the inertial force. Specifically, for example, the operation of applying strong power when the voice coil moves to one side and applying weak power when moving the voice coil to the other side is repeated many times. Next, the operation of giving weak power when moving to one side and giving strong power when moving to the other side is repeated a few times. By repeating this, for example, it is possible to give the user a feeling of being pulled strongly after being pressed for a short time.

<Embodiment 4>
FIG. 16A is a graph showing an example of the sensitivity characteristic of the Pachiny body. As can be seen from FIG. 16 (a), the Patini body has a very high sensitivity to vibration of a predetermined frequency (200 Hz in this example, hereinafter referred to as a peak frequency), but as the frequency deviates from the peak frequency, the sensitivity Decreases rapidly. Depending on the application of the electronic device, it may be desired to maintain sensitivity over a relatively wide frequency range. In the fourth embodiment, a flat vibration sensitivity characteristic is given to an electronic device with a vibration function.

FIG. 16B is a graph showing an example of the overall vibration characteristics of the electronic device 1 including the housing 2, and shows how the acceleration generated in the electronic device 1 changes depending on the vibration frequency. In the example shown in FIG. 16B, the vibration characteristic waveform has peaks at a frequency smaller than 200 Hz and a frequency larger than 200 Hz. That is, the electronic device 1 has a resonance frequency smaller than 200 Hz and a resonance frequency larger than 200 Hz. For example, the natural frequency of the electronic device 1 can be adjusted and the vibration characteristics of the electronic device 1 can be set by appropriately selecting the weight 18, the shape, dimensions, or material of the housing 2. Can do.

The vibration sensitivity of the user is determined by both factors inherent in the human body (that is, how the human body reacts to vibration) and factors given from outside the human body (actual vibrations given from the outside). . Therefore, the vibration sensitivity of the user can be estimated by adding the sensitivity characteristics of the pachini body and the vibration characteristics of the electronic device 1 together. A waveform K3 in FIG. 16C is obtained by adding the waveform K1 in FIG. 16A and the waveform K2 in FIG. 16B, and has a relatively wide frequency band including the peak frequency of the Pachiny body. It has the characteristic that it is flat.

Thus, by setting the vibration characteristics (see FIG. 16B) of the electronic apparatus 1 appropriately in advance, it is possible to maintain high sensitivity over a wide frequency band including the peak frequency of the pachini body. It becomes. Specifically, the vibration characteristic is such that the acceleration is small in the peak frequency band (frequency band near 200 Hz) of the pachini body, and the acceleration is large in a frequency band smaller and larger than that frequency band (FIG. 16B). The electronic device 1 that exhibits flat vibration sensitivity characteristics (see FIG. 16C) can be realized.

<Embodiment 5>
The electronic device according to the fifth embodiment gives vibration to the user by so-called bone conduction. As illustrated in FIG. 17, the electronic device 50 according to the fifth embodiment includes a pipe-shaped housing (hereinafter simply referred to as a pipe) 51 and the vibration device 4 attached to the pipe 51. As the vibration device 4, the vibration device 4 of each of the above-described embodiments can be used.

The electronic device 50 according to the present embodiment is used when the user sandwiches the pipe 51 with the teeth 55. When the vibration device 4 generates vibration, the user feels the vibration through the teeth 55. For example, by generating a vibration simulating the vibration felt when chewing food from the vibration device 4, it is possible to give the user a sense of eating food. In addition, by causing the vibration device 4 to generate vibrations that simulate vibrations that are felt when smoking cigarette smoke, the user can be given a sensation of smoking cigarettes.

DESCRIPTION OF

SYMBOLS

1,8 Electronic device with a vibration function 2 Case 3 Speaker 4 Speaker type vibration device 5 Display device 6 Input device 7 Signal processing circuit 14 Magnetic gap 16 Voice coil 18 Weight 20 Diaphragm 20a Hole 20e Slit

Claims

A magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm fixed to the voice coil,
A speaker-type vibration device, wherein a weight is provided on the diaphragm.
The diaphragm is formed in a substantially flat plate shape with a peripheral edge supported.
The speaker-type vibration device according to claim 1, wherein the weight is provided at a center of the diaphragm.
A magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm fixed to the voice coil,
A speaker-type vibration device, wherein a hole is formed in the diaphragm and a weight is provided.
A magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm fixed to the voice coil,
A speaker-type vibration device, wherein a hole is formed in the diaphragm.
The diaphragm is formed in a substantially flat plate shape with a peripheral edge supported.
The speaker-type vibration device according to claim 4, wherein the diaphragm is formed with a plurality of holes arranged in a circumferential direction inside the peripheral edge.
6. The loudspeaker type vibration device according to claim 1, wherein the resonance frequency is 30 Hz to 300 Hz.
A speaker-type vibration device according to any one of claims 1 to 6;
A speaker including a magnetic circuit having a magnetic gap, a voice coil disposed in the magnetic gap, and a diaphragm fixed to the voice coil;
A signal processing circuit that receives an input signal related to sound and outputs a signal to each voice coil of the speaker and the speaker-type vibration device according to the input signal;
The signal processing circuit includes:
While outputting the other signal for voice based on the same or the input signal to the voice coil of the speaker,
Extracting or generating a signal including a frequency component of 30 Hz to 300 Hz and synchronized with the input signal from the input signal, and outputting the signal to the voice coil of the speaker-type vibration device.
An electronic device with a vibration function.
A pair of each of the speaker and the speaker-type vibration device is provided,
The electronic device with a vibration function according to claim 7, wherein stereo signals are respectively input to the both speakers and the both-speaker type vibration device.
With a grippable housing,
The electronic apparatus with a vibration function according to claim 7 or 8, wherein the speaker-type vibration device and the speaker are attached to the housing, and the signal processing circuit is housed in the housing.
A display device for displaying images;
The signal processing circuit causes the display device to display an image synchronized with sound output from the speaker and vibration output from the speaker-type vibration device. Electronic equipment with vibration function as described.
A speaker-type vibration device according to any one of claims 1 to 6;
A signal supply device that supplies a drive signal to the voice coil so that the voice coil reciprocates,
An electronic device with a vibration function, wherein a drive signal for moving the voice coil to one side is different from a drive signal for moving the voice coil to the other side.