JP2026008074A - Mobile terminal device - Google Patents

Abstract

To make sounds output from a speaker of a watch-type portable terminal device (1) easier to hear.
[Solution] The mobile terminal device 1 has a rounded cubic-shaped housing with a side periphery 2, a bottom 3, and a light-transmitting plate 4, and is equipped with various internal devices including a speaker 8 (not shown). The bottom 3 of the mobile terminal device 1 is integrally formed with belt attachment portions 51a, 51b, 52a, and 52b for attaching a belt 9. The side periphery 2 has a sound hole 21 formed above the belt 9, on the so-called 6 o'clock side. This allows sound from the sound hole to be output toward the user while the mobile terminal device 1 is worn on the wrist H, making the sound easier to hear. Furthermore, the user's face and upper body act as a sound barrier, making it difficult for others to hear when making a hands-free phone call. Furthermore, when holding the mobile terminal device 1 close to the ear to listen to a call, the sound hole 21 can be easily brought closer to the ear.
[Selected figure] Figure 5

Description

The present invention relates to a so-called watch-type mobile terminal device worn on the wrist, and to a mobile terminal device equipped with an internal speaker.

Small-sized portable terminal devices that are worn on the wrist, so-called watch-type portable terminal devices, have become widespread.
For example, there are watch-type (wrist-worn type, usually with a watch function but including those without) mobile terminal devices that are equipped with a function for communication via Bluetooth (registered trademark), allowing users to check emails received on their smartphone, make calls via their smartphone, and even output music played on their smartphone, all at their fingertips.
There are also watch-type portable terminal devices that are equipped with functions such as a call function, a music playback function, a communication function to the Internet, etc., and a voice output function based on the communication function.
In addition, with the growing awareness of health management, smartwatches and other watch-type portable terminal devices have become popular, which can be worn on a part of the body such as the wrist, finger, or leg to easily measure vital information while going about one's daily life, and which also have the above-mentioned functions (communication function, music playback function, etc.).

Such watch-type portable terminal devices commonly include a speaker and a sound hole for outputting sounds and voices.
In the case of a watch-type portable terminal device, a belt for attaching the device to the wrist and operation buttons are provided, so the sound hole for the speaker is provided on the main surface (display surface) of the device body, as shown in Patent Document 1, for example.
In addition, some smartwatches sold as products have speakers located away from the so-called 12 o'clock and 6 o'clock sides where the strap is located, i.e., on the 3 o'clock and 9 o'clock sides of the device body (hereinafter referred to as the left and right sides).

However, in the case of the portable terminal device described in Patent Document 1, since sound holes for speakers are provided on the main surface, there is a problem in that the display screen size becomes small.
On the other hand, in the case of smartwatches where the speakers are located on the left and right sides of the device body, it is possible to use the entire main surface widely, but the sound is emitted from the wrist toward the elbow or from the wrist toward the middle finger, and the sound is not emitted toward the user, making it difficult to hear the sound or voice.

JP 2009-5237 A

The purpose of this invention is to make it easier to hear the sound output from the speaker of a watch-type portable terminal device.

The invention of claim 1 provides a mobile terminal device comprising: a housing having a peripheral side portion, a bottom surface portion, and a light-transmitting plate disposed on the peripheral side portion facing the bottom surface; a speaker disposed inside the housing; a pair of first belt attachment portions disposed below the center of the thickness of the housing, on the 12 o'clock side (the upper side in a plan view) and a pair of second belt attachment portions disposed below the 6 o'clock side (the lower side) of an imaginary axis passing through the housing in a predetermined direction in a plan view; and sound holes formed in the peripheral side portion closer to the light-transmitting plate than the second belt attachment portions, for emitting sound output from the speaker.

According to the present invention, the sound hole through which the sound output from the speaker is emitted is formed closer to the translucent plate than the pair of second mounting portions located on the 6 o'clock side, making the sound output from the speaker easier to hear.

FIG. 2 is an external configuration diagram of a mobile terminal device. FIG. 2 is a perspective view of the mobile terminal device, focusing on its rear side. 2 is a cross-sectional view of the mobile terminal device taken along the line AA in the YZ plane. FIG. 2 is an explanatory diagram illustrating the appearance of a mobile terminal device attached to a belt. FIG. 10 is an explanatory diagram showing a state in which a mobile terminal device with a belt attached is worn on a wrist.

A preferred embodiment of a mobile terminal device 1 of the present invention will be described in detail below with reference to FIGS.
The mobile terminal device 1 in this embodiment is a so-called watch-type mobile terminal device that includes at least an antenna for communicating with the outside and is carried by being worn on the wrist.
The mobile terminal device 1 is assumed to have a basic function and configuration capable of outputting sounds and voices.
In addition, the mobile terminal device 1 may have additional functions such as a time display function, a function that allows communication via Bluetooth, thereby allowing the user to check emails received on the smartphone, a function to make calls via the smartphone, a function to output music played on the smartphone, etc. at the user's fingertips, a communication function via 4G (LTE) or 5G, a communication function via Wi-Fi, a call function or music playback function without using a smartphone, a pedometer function, and a function that allows the user to measure various vital information (biological information) such as heart rate information and blood oxygen concentration by being equipped with a vital sensor, and may also have one or more of the following functions.
Each of these functions is realized by a computer system arranged on a main board 75 (described later) and devices corresponding to the functions.
In the following embodiment, a mobile terminal device 1 will be described as an example, which is realized as a smart watch that not only has the basic function of being able to output sound, etc., but also acquires the user's vital information when worn on the wrist.

4, the mobile terminal device 1 of this embodiment has a rounded cubic housing having a side periphery 2, a bottom surface 3, and a light-transmitting plate 4 (so-called windshield), and includes various internal devices including a speaker 8 (not shown). The internal devices include devices and components (such as a liquid crystal display device, a sensor unit, and an antenna) corresponding to various functions of the mobile terminal device 1, such as a clock function and a vital sign information measurement function.
The bottom surface 3 of the mobile terminal device 1 is integrally formed with belt attachment portions 51a, 51b, 52a, and 52b for attaching a belt 9 with the Y direction in the figure as a predetermined direction.
A sound hole 21 is formed through the side periphery 2 of the portable terminal device 1, above the belt 9, on the side facing the user when the user bends their elbow with the portable terminal device 1 attached to their wrist H, for outputting sound or voice (hereinafter simply referred to as voice) from the speaker.

In this way, the sound hole 21 is formed on the so-called 6 o'clock side of the side periphery 2, rather than on the main surface (translucent plate 4) or on the side of the side periphery 2 perpendicular to the belt 9 (the so-called 3 o'clock side or 9 o'clock side), so that sound from the sound hole 21 is output toward the user while the mobile terminal device 1 is worn on the wrist H, making it easier to hear the sound.
In addition, the user's face and upper body act as a sound barrier, making it difficult for others to hear what is being said when using the hands-free telephone function. Furthermore, when holding the mobile terminal device 1 close to the ear to listen to a call, the sound hole 21 can be easily brought closer to the ear.

In order to output sound directly from the sound hole 21 , the speaker 8 disposed in the mobile terminal device 1 is disposed vertically so as to face the sound hole 21 .
The sound hole 21 has an elongated shape and is formed in an inverted tapered shape such that the opening area of the sound hole 21 is larger on the outside and inside than at the center in the axial direction.
This makes it difficult for dust or the like to get into the inside of the portable terminal device 1 through the sound hole 21, and the inverse tapered shape on the inside makes it easier to pick up sound from the speaker 8, and furthermore the inverse tapered shape on the outside makes it easier for the sound to spread to the outside, making it easier for the user to hear the sound.

(2) Details of the Embodiment FIG. 1 shows a mobile terminal device 1, in which (a) is a plan view, (b) is a front view, and (c) is a right side view.
As shown in FIG. 1, the portable terminal device 1 is formed into a thin cube shape by a side periphery 2, a bottom surface 3, and a light-transmitting plate 4 as a housing.
The mobile terminal device 1 has five faces curved outward except for the cubic-shaped light-transmitting plate 4, and the intersections of the five faces are rounded and chamfered, giving the device an overall rounded appearance.
In the following description, as shown in FIG. 1, the thickness direction of the mobile terminal device 1 is defined as the Z direction, the width direction as the X direction, and the length direction as the Y direction. In accordance with the orientation of the clock face, when viewed in a plan view, the right side (+X side) is defined as the 3 o'clock side, the left side (-X side) as the 9 o'clock side, the upper side (+Y side) as the 12 o'clock side, and the lower side (-Y side) as the 6 o'clock side.

The side periphery 2 constitutes the side periphery of the mobile terminal device 1, and is formed with a sound hole 21, a sound collection hole 22, and operation button holes 23, 23 that penetrate through the side periphery in the thickness direction.
Although the peripheral side portion 2 in this embodiment is made of a resin material, it may also be made of a metal material such as stainless steel or titanium, or ceramics.

The sound hole 21 is a through hole for outputting sound from a speaker 8 (not shown) disposed in the mobile terminal device 1 to the outside.
1(b), the sound hole 21 in this embodiment is formed on the 6 o'clock side (-Y side) surface of the side periphery 2. As a result, the sound coming out of the sound hole 21 is directed toward the wearer of the mobile terminal device 1, making it easier for the wearer to hear the sound.
The sound hole 21 is formed in an elliptical shape with a width equal to or greater than the size of the speaker 8, particularly the width (width in the X direction) of the speaker 8.
In this embodiment, the sound hole 21 is formed at approximately the center in the X direction and the center in the Z direction on the 6 o'clock side surface of the side periphery 2, in accordance with the position of the speaker 8 (see Figure 3) placed inside.
However, depending on the position of the speaker 8, it is also possible to displace the speaker 8 in either the Z direction or the X direction from the center with respect to the 6 o'clock side surface of the side periphery 2.
The sound hole 21 is formed long in the X direction in consideration of the spread of sound, and the detailed shape of the sound hole 21 will be described later.

The sound collection hole 22 is a through hole for collecting sound and the like with a microphone (not shown) disposed in the mobile terminal device 1 .
This sound collection hole 22 is formed on the 12 o'clock side opposite the sound hole 21 so that the microphone does not pick up the sound output from the sound hole 21.
The sound collection hole 22 is disposed on the +X side of the center in the X direction so that the mobile terminal device 1 can be brought closer to the face (mouth) when the mobile terminal device 1 is held on the left hand and brought closer to the face with the elbow bent. The internal microphone is also disposed on the +X side in line with the sound collection hole 22.

As shown in Figures 1(a) to (c), the operation button holes 23, 23 are through holes for exposing the surfaces of the operation buttons 61, 62, which are used to perform various operations on the mobile terminal device 1, to the outside of the side peripheral portion 2, and are formed in two places on the side surface on the 6 o'clock side.
The operation button holes 23 are formed in the same shape in consideration of convenience when attaching the operation buttons 61 and 62 and design, and therefore the operation button holes 23, 23 also have the same shape.
The operation buttons 61 and 62 can be assigned functions according to the various functions of the mobile terminal device 1. In this embodiment, the operation button 61 functions as a power button for turning the power of the mobile terminal device 1 on and off when pressed and held down, and functions as a button for returning the display screen of the liquid crystal display device 76 (see FIG. 3 ) of the mobile terminal device 1 to the home screen when pressed briefly while the power is on.
The operation button 62 is an SOS button to be pressed in an emergency. Because it is a button to be used in an emergency, the operation button 61 protrudes outward from the peripheral surface of the side peripheral portion 2, whereas the surface of the operation button 62 is located flush with or inside the peripheral surface of the side peripheral portion 2, as shown in FIG. 1( a).
In this embodiment, two operation button holes 23 are formed on the side periphery 2 on the 3 o'clock side to match the operation buttons 61 and 62, but it is also possible to form more operation buttons and operation button holes 23. In this case, all of them may be formed and arranged on the periphery surface on the 3 o'clock side of the side periphery 2, or some or all of them may be formed and arranged on the opposite side, on the 9 o'clock side.

The bottom surface portion 3 is the surface that comes into contact with the wrist H (see FIG. 4) when the mobile terminal device 1 is attached, and is formed as a separate body from the same material as the peripheral side portion 2. However, the peripheral side portion 2 and the bottom surface portion 3 can also be formed integrally.
FIG. 2 is a perspective view of the mobile terminal device 1, mainly showing its rear side.
As shown in FIGS. 1 and 2, two pairs of belt attachment portions 51a, 51b, 52a, 52b, a curved recess 31, a through hole for the charging portion 71, a through hole for the sensor portion 72, and a screw recess 32 are formed.

The belt attachment portions 51 a , 51 b , 52 a , and 52 b are members for attaching a belt 9 (see FIG. 4 ) to the mobile terminal device 1 , and are formed integrally with the bottom surface portion 3 from the same material.
A pair of belt attachment portions 51a, 51b are formed on the 6 o'clock side of the bottom surface portion 3 in the Y direction, and a pair of belt attachment portions 52a, 52b are formed on the 12 o'clock side.
A bottomed pin hole 51c is formed on the opposing side of each of the belt attachment portions 51a, 51b, and a bottomed pin hole 52c is formed on the opposing side of each of the belt attachment portions 52a, 52b.
The pin hole 51c is a hole for pinning the adapter 93 of the belt 9, and the pin hole 52c is a hole for pinning the fixed portion 92 of the belt 9 (see FIG. 4).
Although the pin holes 51c and 52c in this embodiment are bottomed holes, they may be formed as through holes that pass through the belt attachment portions 51a, 51b, 52a, and 52b, respectively.

The curved recesses 31 are curved recesses formed between the pair of belt attachment portions 51a, 51b and between the pair of belt attachment portions 52a, 52b, to prevent the fixing portions 92 of the attached belt 9 from getting caught.

An opening for the charging unit 71 is formed near the belt attachment parts 51a and 51b of the bottom surface part 3, and charging terminals of the charging unit 71 are exposed in this opening.
In addition, an opening for a sensor unit 72 that detects vital information (biological information) of the user wearing the mobile terminal device 1 is formed in approximately the center of the bottom portion 3, and a part of the sensor unit 72 is positioned so as to protrude from this opening.

The belt attachment portions 51a, 51b, 52a, and 52b are formed to protrude further toward the −Z side than the outer bottom surface of the bottom portion 3.
However, the belt attachment parts 51a, 51b, 52a, and 52b are formed so that the imaginary surfaces that contact the respective lower ends are on the +Z side of the lower end surface of the sensor part 72. This allows the sensor part 72 to more reliably contact the user's skin and enable accurate measurements.

The screw recesses 32 are formed at four locations in total: on both outer sides of the pair of belt attachment portions 51a, 51b and on both outer sides of the pair of belt attachment portions 52a, 52b.
Each screw-retaining recess 32 has a through-hole formed in its center, and the bottom surface portion 3 is screwed to the side peripheral portion 2 with a set screw 33. The screw-retaining recess 32 is a recess that hides the head of the set screw 33 used for fixing.
By forming the screw-fastening recess 32 nearby, the bottom portion 3 is fixed to the side peripheral portion 2 with a set screw 33 at a position just outside the belt attachment portions 51a, 51b, 52a, and 52b, thereby increasing the strength of the belt attachment portions 51a, 51b, 52a, and 52b.

The light-transmitting plate 4 corresponds to the crystal of a watch, and is made of various light-transmitting materials, such as glass materials such as sapphire glass and mineral glass, and plastic materials such as acrylic glass and polycarbonate.
The light-transmitting plate 4 is used over the entire main surface of the mobile terminal device 1, and is disposed on the upper surface of an inner flange portion 25 (see Figure 3) formed on the inner peripheral surface of the side peripheral portion 2 so as to protrude inward (toward the center), and is fixed thereto with an adhesive or the like.

Next, an outline of the internal configuration of the portable terminal device 1 and the shape of the sound hole 21 will be described.
FIG. 3 shows a cross section taken along line AA of FIG. 1B along the YZ plane of the mobile terminal device 1, and an enlarged cross section of the vicinity of the sound hole 21. In FIG.
As shown in Figure 3(a), inside the housing consisting of the side periphery 2, bottom surface 3, and light-transmitting plate 4, there are arranged, in order from the bottom surface 3 side, a charging unit 71, a sensor unit 72, a battery 74, a main board 75, and a liquid crystal display device 76, and the light-transmitting plate 4 is disposed above the liquid crystal display device 76 as a windshield.
Additionally, on the inner surface of the side periphery 2, a speaker 8, a waterproof membrane 81, a microphone (not shown), and various antennas for communication are arranged.
These components are connected directly or indirectly to the battery 74 via conductive sheets or the like.

The charging section 71 is a member for charging the battery 74 housed inside the mobile terminal device 1, and includes a charging terminal board and terminals.
The charging terminal board of the charging unit 71 in this embodiment is connected to the battery 74 by a connecting wire (not shown).
In addition, part of the terminal of the charging unit 71 is exposed to the outside through a through hole formed on the 6 o'clock side of the bottom portion 3, and the internal battery 74 is charged by connecting the exposed terminal of this charging unit 71 to a charging IC and a charger (not shown).
The charging section 71 is fixed to the inner surface of the bottom section 3 by the portion that is not exposed from the bottom section 3.

As described above, the sensor unit 72 is a substrate on which sensors are arranged to acquire vital information of the user wearing the mobile terminal device 1, and a portion of the sensor is arranged to pass through a square through-hole formed approximately in the center of the bottom portion 3.
The sensor unit 72 is positioned so as to protrude slightly from the bottom surface 3, and is positioned so as to be in closer contact with the user's skin (wrist H).
The sensor unit 72 is provided with a sensor corresponding to the vital sign detection function of the mobile terminal device 1, and is provided with at least one of various sensors that detect vital sign information such as the user's heart rate, pulse wave, respiratory rate, blood pressure, blood oxygen concentration (SpO2), body temperature, etc.
The sensor unit 72 is fixed to the inside surface of the bottom surface unit 3 inside the mobile terminal device 1 by screwing or taping.

The battery 74 is fixed in place by a battery holder (not shown).
The battery 74 is a power source that supplies power to the main board 75 and the sensor unit 72, and is a rechargeable battery such as a lithium ion battery or a nickel-metal hydride battery.

The main board 75 is provided with a control unit including a CPU, ROM, RAM, storage device, etc., as elements for realizing various functions and information processing provided by the mobile terminal device 1, such as a voice output function, a vital sign information acquisition function, a clock function, a communication function, a screen display function, etc., as well as elements and devices corresponding to each function. These elements and devices are distributed and arranged on both sides of the main board 75.
The ROM and storage device store various programs that enable the CPU to realize the functions of the mobile terminal device 1. For example, the CPU executes a vital sign information program to calculate vital sign information such as heart rate and blood oxygen concentration from data detected by the sensor unit 72, display it on the liquid crystal display device 76, send it to an external device via the communication unit, and receive instructions from the external device.

A liquid crystal display (LCD) 76 is disposed directly below the light-transmitting plate 4 .
Although the liquid crystal display device 76 is used in this embodiment, it is also possible to use an AMOLED (Active Matrix Organic Light-Emitting Diode, active matrix organic EL) module.
The liquid crystal display device 76 has a liquid crystal display for displaying the vital information detected in this embodiment, displaying various information corresponding to the clock function and image display function of the mobile terminal device 1, and displaying various information transmitted from external devices.
The liquid crystal display device 76 includes a liquid crystal display having a display function and various touch panels disposed above the liquid crystal display.
The touch panel is an input device that causes the liquid crystal display device 76 to function as an input device. The touch panel detects the position touched (pressed) by the user via the light-transmitting plate 4, and acquires inputs and instructions corresponding to various icons and the like displayed on the liquid crystal display corresponding to the touched position.

As described above, the speaker 8 and the waterproof membrane 81 are disposed on the inner surface of the side periphery 2 so as to face the sound hole 21 .
FIG. 3B is an enlarged cross-sectional view of the vicinity of the sound hole 21.
As shown in FIG. 3B, a sound hole 21 that is horizontally elongated (in the X direction) as shown in FIG. 1B is formed in the side periphery 2 of the portable terminal device 1 .
A recess 210 is formed on the inner surface of the side periphery 2 around the sound hole 21 in a shape that matches the outer shape of the speaker 8 .

The speaker 8 is placed vertically, with its sound output surface facing the sound hole 21 and a portion of its thickness (Y direction) inserted into the recess 210, and is fixed in place with adhesive or the like.
The speaker 8 is fixed with its outer circumferential surface abutting against the inner circumferential surface of the recess 210, and the sound output surface is positioned a predetermined distance from the bottom surface of the recess 210, thereby forming a sound space between the recess 210 and the speaker 8. A horizontally elongated sound hole 21 is formed in approximately the center of this sound space.
The waterproof film 81 is a film for preventing liquid from entering through the sound hole 21 , and is adhered to the bottom of the recess 210 so as to cover the entire through-hole formed by the sound hole 21 .

As shown in Figures 3(b) and 1(b), the opening area (cross-sectional area) of the sound hole 21 in the XZ plane is not uniform in the thickness direction (Y direction) of the side peripheral portion 2, but is formed so that it is narrowest in the central part in the thickness direction (hole central portion 211), and the outer reverse tapered portion 212 is formed in a reverse tapered shape, with the opening area increasing as it moves outward (towards the +Y side) from the hole central portion 211.
Similarly, an inner reverse tapered portion 213 is formed in a reverse tapered shape such that the opening area increases from the hole center portion 211 toward the inside (−Y side).
1(b), the inner oval portion represents the hole center portion 211, and the portion between the inner and outer oval portions represents the outer reverse tapered portion 212. In this way, both the openings of the outer reverse tapered portion 212 and the inner reverse tapered portion 213 are formed so as to expand from the hole center portion 211 not only in the lateral direction (X direction) but also in all circumferential directions, including the thickness direction (Z direction).

Next, the usage of the portable terminal device 1 configured as above will be described.
4A and 4B are explanatory diagrams showing the appearance of the mobile terminal device 1 with the belt 9 attached, with FIG. 4A being a perspective view from above the right front, and FIG. 4B being a left side view.
The belt 9 attached to the mobile terminal device 1 is made of nylon, but it is also possible to use leather, silicone, or metal belts. The belt 9 can also be a bracelet or strap type belt.

A fixing portion 92 that functions as a so-called end piece is disposed on one end side of the belt 9, and this fixing portion 92 is pinned to pin holes 52c (see FIG. 2) of the belt attachment portions 52a, 52b of the bottom portion 3.
Meanwhile, the other end of the belt 9 passes through the loop of a rectangular annular adapter 93 and is folded back so that the length can be adjusted and the belt 9 can be fixed by a hook-and-loop fastener (not shown) disposed inside the other end. The adapter 93, like the fixing part 92, is pinned to the pin holes 51c of the belt attachment parts 51a and 51b, thereby attaching the belt 9 to the mobile terminal device 1.

FIG. 5 shows a state in which the mobile terminal device 1 with the belt 9 attached is worn on the wrist H in use.
According to the portable terminal device 1 of this embodiment, the sound hole 21 is formed at the 6 o'clock position on the side periphery 2 , that is, on the upper side of the belt 9 .
This allows the user to naturally bend their elbow, thereby moving the sound hole 21 of the mobile terminal device 1 worn on the wrist H to a position facing the face F. Then, as shown by the dotted line P, the sound from the sound hole 21 can be output in the direction of the face F (ear).
Furthermore, when the portable terminal device 1 is held close to the ear to listen to a call, the sound hole 21 can be easily brought closer to the ear.
The user's face and upper body act as a sound barrier, making it difficult for others to hear what the user is saying when talking using hands-free telephone functionality.

On the other hand, the sound collection hole 22 for picking up the user's voice is formed on the side periphery 2 opposite the sound hole 21 (12 o'clock side), so that the microphone is less likely to pick up the voice output from the sound hole 21.
Furthermore, by providing the sound collection hole 22 on the +X side of the 12 o'clock side in the side periphery 2, the user's voice can be picked up at a position closer to the mouth.

Furthermore, in the portable terminal device 1 of this embodiment, as shown in FIG. 3, the speaker 8 is disposed vertically, so that a large area can be secured within the portable terminal device 1 for arranging devices and the like.
Furthermore, since the surface of the speaker 8 from which sound is output faces the sound hole 21, the sound output from the speaker 8 can be emitted directly from the sound hole 21.
Furthermore, since the sound hole 21 is arranged on the side periphery 2 rather than on the main surface of the mobile terminal device 1, a large display area d can be secured on the main surface.
Furthermore, as shown in FIGS. 1(b) and 4(a), the sound hole 21 has an elongated shape, which can prevent dust and the like from entering the interior.
Furthermore, as shown in Figure 3(b), a sound space is formed between the bottom surface of the recess 210 for the speaker 8 formed on the inner surface of the side peripheral portion 2 and the speaker 8, so that the sound output from the speaker 8 can be efficiently released to the outside through the sound hole 21.
Furthermore, since the sound hole 21 has the inner inverse tapered portion 213, the sound output from the speaker 8 can be emitted from the sound space to the outside of the mobile terminal device 1 more efficiently.
Furthermore, since the sound hole 21 is formed with the outer inverse tapered portion 212, the sound emitted from the portable terminal device 1 spreads more easily, making it easier for the user to hear the sound.

The above describes a mobile terminal device 1, which is one embodiment of the present invention. However, the present invention is not limited to the described embodiment, and various modifications can be made within the scope, embodiments, and modified examples set forth in the claims.
For example, in the embodiment described above, the portable terminal device 1 is formed in a square shape in a plan view, but it can also be formed in a circular shape. In this case, the sound hole 21 is also formed on the +Z side of the belt 9, at the 6 o'clock position, as in the embodiment.

In addition, in the embodiment described above, the side peripheral portion 2 and the bottom surface portion 3 are formed as separate bodies and are fixed together with a set screw 33 inserted through the screw-retaining recess 32, but it is also possible to form the side peripheral portion 2 and the bottom surface portion 3 as a single body.
In this case, it is desirable that a pair of belt mounting portions 51a, 51b and a pair of belt mounting portions 52a, 52b (hereinafter simply referred to as belt mounting portions 51, 52) for attaching the belt 9 be attached at the same position as the bottom surface portion 3 in the embodiment.

In both the embodiment in which the side periphery 2 and the bottom surface 3 are formed separately and the embodiment in which they are formed integrally, the belt attachment portions 51, 52 may be formed closer to the +Z side.
In this case, it is preferable that the belt attachment portions 51 and 52 are formed on the −Z side of the center of the overall thickness of the mobile terminal device 1 (center in the Z direction) in order to ensure an area for forming the sound hole 21 .
By forming the sound hole 21 on the +Z side more than in the embodiment, the sound can be brought closer to the user.

In the embodiment described above, the sound hole 21 has reverse tapered portions (inner reverse tapered portion 213 and outer reverse tapered portion 212) formed on both the inside and outside of the hole center portion 211.
However, it is more preferable to provide only the outer reverse tapered portion 212 than to provide only the inner reverse tapered portion 213, as this will spread the emitted sound.

The mobile terminal device 1 in the embodiment and modified examples described above can be configured as follows.
(1) Configuration 1
a housing having a side periphery, a bottom surface, and a light-transmitting plate disposed on the side periphery facing the bottom surface;
a speaker disposed inside the housing;
a pair of first belt attachment portions disposed on the 12 o'clock side, which is an upper side in a plan view, and a pair of second belt attachment portions disposed on the 6 o'clock side, which is a lower side, of a virtual axis in a predetermined direction passing through the housing in a plan view, at positions lower than the center in a thickness direction of the housing;
a sound hole formed in the side peripheral portion closer to the light-transmitting plate than the second belt attachment portion, through which sound output from the speaker is emitted;
A mobile terminal device comprising:
(2) Configuration 2
The sound hole is formed in an inverted tapered shape such that the opening area in a plane perpendicular to the axial direction of the sound hole gradually increases from a central portion in the axial direction toward the outside.
2. The mobile terminal device according to configuration 1.
(3) Configuration 3
The sound hole is formed in an inverted tapered shape such that the opening area in a plane perpendicular to the axial direction of the sound hole gradually increases from a central portion in the axial direction toward the inside.
3. The mobile terminal device according to claim 1, wherein the first and second inputs are connected to the first and second inputs.
(4) Configuration 4
The speaker is a flat speaker and is disposed in a vertical direction at a position facing the sound hole.
4. The mobile terminal device according to claim 1, 2, or 3.
(5) Configuration 5
A waterproof membrane is provided on the inner surface of the sound hole facing the speaker.
5. The mobile terminal device according to configuration 4.
(6) Configuration 6
a sensor portion for detecting a living body, the sensor portion penetrating the bottom surface portion and disposed in a protruding state;
Equipped with
Lower ends of the first belt attachment portion and the second belt attachment portion are located closer to the light-transmitting plate than a lower end of the sensor portion.
6. The mobile terminal device according to any one of configurations 1 to 5,
(7) Configuration 7
the side periphery and the bottom surface are formed separately,
The bottom surface portion is screwed to the side periphery at positions outside the first belt attachment portion and at positions outside the second belt attachment portion.
7. The mobile terminal device according to any one of configurations 1 to 6, wherein:
(8) Configuration 8
the first belt attachment portion and the second belt attachment portion are integrally formed with the bottom surface portion;
8. The mobile terminal device according to any one of configurations 1 to 7, wherein:

REFERENCE SIGNS LIST 1 Portable terminal device 2 Side peripheral portion 21 Sound hole 210 Recessed portion 211 Hole center portion 212 Outer reverse tapered portion 213 Inner reverse tapered portion 22 Sound collection hole 23 Operation button hole 25 Inner flange portion 3 Bottom surface portion 31 Curved recessed portion 32 Screw-fastening recessed portion 33 Setscrew 4 Light-transmitting plate 51a, 51b Belt attachment portion 52a, 52b Belt attachment portion 51c, 52c Pin holes 61, 62 Operation button 71 Charging portion 72 Sensor portion 74 Battery 75 Main board 76 Liquid crystal display device 8 Speaker 81 Waterproof membrane 9 Belt 92 Fixing portion 93 Adapter d Display portion F Face H Wrist

Claims (8)

a housing having a side periphery, a bottom surface, and a light-transmitting plate disposed on the side periphery facing the bottom surface;
a speaker disposed inside the housing;
a pair of first belt attachment portions disposed on the 12 o'clock side, which is an upper side in a plan view, and a pair of second belt attachment portions disposed on the 6 o'clock side, which is a lower side, of a virtual axis in a predetermined direction passing through the housing in a plan view, at positions lower than the center in a thickness direction of the housing;
a sound hole formed in the side peripheral portion closer to the light-transmitting plate than the second belt attachment portion, through which sound output from the speaker is emitted;
A mobile terminal device comprising: The sound hole is formed in an inverted tapered shape such that the opening area in a plane perpendicular to the axial direction of the sound hole gradually increases from a central portion in the axial direction toward the outside.
2. The mobile terminal device according to claim 1, wherein: The sound hole is formed in an inverted tapered shape such that the opening area in a plane perpendicular to the axial direction of the sound hole gradually increases from a central portion in the axial direction toward the inside.
2. The mobile terminal device according to claim 1, wherein: The speaker is a flat speaker and is disposed in a vertical direction at a position facing the sound hole.
2. The mobile terminal device according to claim 1, wherein: A waterproof membrane is provided on the inner surface of the sound hole facing the speaker.
5. The mobile terminal device according to claim 4. a sensor portion for detecting a living body, the sensor portion penetrating the bottom surface portion and disposed in a protruding state;
Equipped with
Lower ends of the first belt attachment portion and the second belt attachment portion are located closer to the light-transmitting plate than a lower end of the sensor portion.
2. The mobile terminal device according to claim 1, wherein: the side periphery and the bottom surface are formed separately,
The bottom surface portion is screwed to the side periphery at positions outside the first belt attachment portion and at positions outside the second belt attachment portion.
2. The mobile terminal device according to claim 1, wherein: the first belt attachment portion and the second belt attachment portion are integrally formed with the bottom surface portion;
2. The mobile terminal device according to claim 1, wherein: