JP2005340952A - Small-sized component mount structure and light source mount structure in mobile electronic apparatus, mobile electronic apparatus, and flexible wiring board arrangement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized component mount structure and a light source mount structure in a mobile electronic apparatus, the mobile electronic apparatus, and a flexible wiring board arrangement method capable of enhancing the mount density and contributes to a low profile of the apparatus. <P>SOLUTION: An FPC 23 mounted with a multi-color light emitting section 24 and a white color light emitting section 25 is fitted to a lower side of a support frame 32, a wiring board 33 is fitted to an upper side of the support frame 32, the multi-color light emitting section 24 is exposed from openings 32a, 33a formed to the support frame 32 and the wiring board 33, and the white color light emitting section 25 is deposited in the opening 32b formed to the support frame 32. A logo plate 22 is fitted to the support frame 32 in a way that tip faces 26a, 27a are respectively exposed from openings 21a, 21b of a rear cover 21 and the multi-color light emitting section 24 and the white color light emitting section 25 light up a prescribed part of the logo plate 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a small component mounting structure, a light source mounting structure, a portable electronic device, and a flexible wiring board arrangement method in a portable electronic device, and an LED (Light Emission Diode) or the like in a casing of the portable electronic device such as a cellular phone. The present invention relates to a small component mounting structure and a light source mounting structure in a portable electronic device mounted with a small component, a portable electronic device including the small component mounting structure, and a flexible wiring board arrangement method used in the small component mounting structure.

2. Description of the Related Art Conventionally, in a mobile phone as an electronic device, for example, a light source such as an LED for incoming notification or key top illumination is mounted on a wiring board disposed in a housing (for example, Patent Document 1 and Patent Document 2). Reference)), and the light is transmitted to the housing surface side.
For example, in a foldable mobile phone in which an emblem is arranged on the back side of the housing and a display panel is arranged on the front side, the light emitting unit 101 that displays the emblem in an incoming call or a call is shown in FIGS. As shown in the figure, a logo plate 103 attached to a rear cover 102 constituting a housing, and a multicolor light emitting unit 105 and a white light emitting unit 106 both mounted on a wiring board 104 are included.

The logo plate 103 includes, for example, a convex portion 107 having an oval cross section corresponding to an exclamation mark and a convex portion 108 having a small cross section on the flat plate portion 109. Are arranged so as to be fitted into an oval opening 102a and a small circular opening 102b formed in the rear cover 102 of the housing.
The multicolor light emitting unit 105 includes a red LED, a green LED, and a blue LED that respectively emit light in three primary colors, mainly illuminates the convex portion 107, and the white light emitting unit 106 includes a high-intensity white LED. The projection 108 is mainly illuminated.
The wiring board 104 on which the multicolor light emitting unit 105 and the white light emitting unit 106 are mounted is disposed on the upper surface (rear surface) side of the holding frame 109 and is held by the holding frame 109.
Further, an optical member group 110 including a light guide plate, a diffusion sheet, and a prism sheet is disposed on the lower surface (front surface) side of the holding frame 109, and the optical member group 110 is sandwiched between the holding frame 109. The liquid crystal display panel 111 is fixed via a frame-like double-sided adhesive sheet or the like.
JP2003-122260A (FIGS. 6 and 7) JP-A-11-225192 (FIG. 5)

  The problem to be solved is that in the above prior art, the multi-color light emitting unit 105 and the white light emitting unit 106 are mounted on the wiring board 104, and electronic components are also mounted on the lower surface (back side) side of the wiring board 104. Therefore, as shown in FIG. 9, the distance D0 between the upper surface of the wiring board 104 and the rear surface of the rear cover 102 is set to be relatively large, which hinders the thinning of the device.

  The present invention has been made in view of the above-described circumstances, and improves the mounting density and contributes to the thinning of the device. The compact component mounting structure, the light source mounting structure, the portable electronic device, and the portable electronic device It aims at providing the flexible wiring board arrangement method.

  In order to solve the above-described problem, the invention according to claim 1 relates to a small component mounting structure in which a small component is mounted on a casing of a portable electronic device, and has first and second surfaces facing each other. A first substrate is disposed on the first surface side of the holding base, a second substrate is disposed on the second surface side, and the small component is mounted on the second substrate. A base opening and a substrate opening are formed in the holding base and the first substrate, respectively. The holding base and the first and second substrates are located near the inner wall surface of the housing. The small component mounting area on the second substrate, the substrate opening of the holding substrate, and the substrate opening of the first substrate are overlapped with each other. It is characterized by being installed.

  According to a second aspect of the present invention, there is provided a small component mounting structure in the portable electronic device according to the first aspect, wherein the small component penetrates the base body opening and the substrate opening, and the second It is characterized by being mounted on the substrate.

  The invention according to claim 3 relates to a small component mounting structure in the portable electronic device according to claim 1 or 2, wherein at least a part of the small component is disposed in the base opening. It is mounted on the second substrate.

  According to a fourth aspect of the present invention, there is provided the small component mounting structure in the portable electronic device according to the first, second, or third aspect, wherein the second substrate is made of a flexible wiring board.

  According to a fifth aspect of the present invention, there is provided the small component mounting structure in the portable electronic device according to the fourth aspect, wherein the second base side of the holding base has a plate shape with the second substrate interposed therebetween. It is characterized in that parts are arranged.

  According to a sixth aspect of the present invention, there is provided a small component mounting structure in the portable electronic device according to any one of the first to fifth aspects, wherein the small component includes a point light source. The substrate opening and the substrate opening are arranged so that light emitted from a light source is emitted from a window provided in the housing.

  According to a seventh aspect of the present invention, there is provided a small component mounting structure in the portable electronic device according to the fifth or sixth aspect, wherein the plate-shaped component is an optical component constituting a liquid crystal display device.

  According to an eighth aspect of the present invention, there is provided a small component mounting structure in the portable electronic device according to the seventh aspect, wherein the optical component includes a light guide plate of a backlight device.

  A ninth aspect of the invention relates to a small component mounting structure in the portable electronic device according to the sixth, seventh, or eighth aspect, wherein the window portion is formed on the housing opening formed in the housing. It is characterized in that an illuminated plate that is illuminated by a shaped light source is fitted.

  According to a tenth aspect of the present invention, there is provided a small component mounting structure in a portable electronic device according to the ninth aspect, wherein the housing opening and the illuminated plate are molded so as to form a predetermined pattern. It is characterized by being.

  An eleventh aspect of the present invention relates to a small component mounting structure in the portable electronic device according to any one of the sixth to tenth aspects, wherein the point light source includes a light emitting diode.

  According to a twelfth aspect of the present invention, there is provided a small component mounting structure in a portable electronic device according to any one of the fourth to eleventh aspects, wherein the second portion of the holding base is located near the base opening. A wiring board insertion hole for inserting a connection wiring board made of a flexible wiring board connected to the substrate is formed, and the connection wiring board having one end inserted through the wiring board insertion hole is on the first surface side. It is characterized by being arranged.

  A thirteenth aspect of the present invention relates to a small component mounting structure in a portable electronic device according to the twelfth aspect, wherein the connection wiring board is connected to the backlight device constituting the liquid crystal display device. It is characterized by being connected to a board.

  According to a fourteenth aspect of the present invention, there is provided a light source mounting structure in which a point light source is mounted on a casing of a portable electronic device, and the first holding substrate having first and second surfaces facing each other. The first substrate is disposed on the surface side of the first substrate, the second substrate is disposed on the second surface side, the point light source is mounted on the second substrate, and the holding base and the first substrate are disposed on the second substrate. A substrate opening and a substrate opening are respectively formed in one substrate, and the holding substrate and the first and second substrates are arranged such that the substrate opening is disposed in the vicinity of the inner wall surface of the housing. And the mounting area of the point light source on the second substrate, the base opening of the holding base, and the substrate opening of the first substrate are overlapped with each other, and The point light source penetrates the substrate opening and the substrate opening, or at least a part of the point light source is The substrate opening and the substrate mounted on the second substrate in a state of being disposed in the substrate opening, and so that the light emitted from the point light source is emitted from the window provided in the housing. The substrate opening is arranged.

  According to a fifteenth aspect of the present invention, a portable electronic device includes the small component mounting structure in the portable electronic device according to any one of the first to thirteenth aspects.

  According to a sixteenth aspect of the present invention, there is provided a flexible wiring board arranging method used in a small component mounting structure in which a small component is mounted on a casing of a portable electronic device. A first substrate having a substrate opening corresponding to the substrate opening is disposed on the first surface side of the holding substrate having a substrate opening and a wiring board insertion hole formed in a predetermined portion. A second wiring board made of a flexible wiring board on which the small component is mounted is disposed on the second surface side, and a connection wiring board made of the flexible wiring board is disposed at one end of the wiring board insertion hole. It is characterized in that it is connected to the second substrate in a state of being inserted into the first substrate, at least an intermediate portion thereof is disposed on the first surface side, and the other end portion is connected to the first substrate.

  The invention according to claim 17 relates to a flexible wiring board arrangement method used in the small component mounting structure according to claim 16, wherein the small component penetrates the base opening and the substrate opening. It is mounted on the second substrate.

  The invention according to claim 18 relates to a flexible wiring board arrangement method used in the small component mounting structure according to claim 16 or 17, wherein at least a part of the small component is arranged in the base opening. In the state, it is mounted on the second substrate.

  The invention described in claim 19 relates to a flexible wiring board arrangement method used in the small component mounting structure according to claim 16, 17 or 18, wherein the wiring board insertion hole also serves as the base opening. It is said.

  The invention according to claim 20 relates to a flexible wiring board arrangement method used in the small component mounting structure according to claim 16, 17 or 18, wherein the wiring board insertion hole is formed in the vicinity of the base opening. It is characterized by that.

  The invention according to claim 21 relates to a flexible wiring board arrangement method used in the small component mounting structure according to any one of claims 16 to 20, wherein the small component has a point light source, The base opening and the substrate opening are arranged so that light emitted from the point light source is emitted from a window provided in the housing.

  The invention according to claim 22 relates to a flexible wiring board arrangement method used in the small component mounting structure according to any one of claims 16 to 21, and the second surface side of the holding base has A backlight device constituting a liquid crystal display device is provided with the second substrate interposed therebetween.

  The invention according to claim 23 relates to a flexible wiring board arrangement method used in the small component mounting structure according to claim 22, wherein the connection wiring board is connected to a connection wiring board connected to the backlight device. It is characterized by having.

According to the configuration of the present invention, the second substrate on which the small component is mounted is attached to the holding base from the second surface side of the holding base, and the small component includes, for example, the base opening and the substrate opening. By penetrating or at least part of it being disposed in the base opening, at least the total thickness of the holding base and the first substrate can be reduced, and the mounting density can be improved. This can contribute to the thinning of the device.
Further, by disposing the connection wiring board made of the flexible wiring board on the first surface side of the holding base, for example, it is not necessary to provide a notch at the end of the holding base, and the required holding base has a sufficient rigidity. Can be secured.

  The second substrate on which the small component is mounted is attached to the holding substrate from the second surface side of the holding substrate, and the small component penetrates the substrate opening and the substrate opening, or at least a part thereof. However, by arranging in the base opening, at least the total thickness of the holding base and the first substrate is reduced, and the purpose of improving the mounting density and contributing to the thinning of the device is realized. .

  FIG. 1 is an exploded perspective view for explaining the configuration of a light source mounting structure of a mobile phone according to a first embodiment of the present invention, FIG. 2 is a perspective view showing the configuration of the mobile phone, and FIG. FIG. 4 is a cross-sectional view for explaining the configuration of the light source mounting structure, and FIG. 5 is a cross-sectional view showing a partially broken configuration of the light source mounting structure.

As shown in FIG. 2, the cellular phone 1 of this example includes a foldable casing 2 and can perform homepage browsing by connecting to the Internet or connecting to the Internet, for example, in addition to the original call function. As shown in FIG. 3, the control unit 3 has a data communication function and controls each component of the mobile phone body, and the storage unit 4 stores processing programs executed by the control unit 3, various data, and the like. A wireless communication unit 6 that transmits and receives wireless radio waves via the antenna 5 and performs communication and data communication according to a predetermined protocol, and a light emitting unit 7 that has an LED and emits light at the time of an incoming call or a call, The LED driving unit 8 for driving the LEDs constituting the light emitting unit 7 and a liquid crystal display device disposed on the inner side when folded, for example, a character message, a function setting screen, a standby screen, etc. A display unit 9 to be displayed, an operation unit 11 including a number of various operation keys for inputting numbers and characters, a reception unit 12 having a speaker for outputting a reception voice, and transmission It is roughly composed of a transmission unit 13 having a microphone for inputting voice, a ringer generation unit 14 that generates a ring tone when an incoming call is received, and a vibration unit 15 for notifying an incoming call by vibration, for example.
The housing 2 includes an upper housing 18 and a lower housing 19 that are coupled to each other by a hinge portion 17. The hinge portion 17 can freely rotate the upper housing 18 and the lower housing 19. The mobile phone 1 is provided with a foldable structure.

The control unit 3 is composed of a CPU (central processing unit) or the like, executes various processing programs stored in the storage unit 4, and controls each component using various registers and flags secured in the storage unit 4. Various control processes are executed.
The storage unit 4 includes a semiconductor memory such as a ROM and a RAM, and is a light emission control processing program executed by the control unit 3, an operation control processing program, a communication control processing program, a display control processing program, and a program for browsing a homepage. Program storage area that stores various processing programs such as a mailer as a program for creating, sending and receiving e-mail, and various information such as setting information, communication history information, and phone book information And an information storage area in which various registers and flags used by the control unit 3 during program execution are secured.
The light emission control program describes a procedure for performing light emission control for causing each LED constituting the light emitting unit 7 to blink according to a preset blinking pattern at the time of an incoming call or a call and to display a desired illumination pattern. .

The light emitting unit 7 of this example has both an incoming call notification function for notifying that when an incoming call is received and an illumination display function for displaying a predetermined emblem in an illuminated manner.
As shown in FIGS. 1, 4, and 5, the light emitting unit 7 is mounted on a FPC (Flexible Printed Circuit) 23 together with a logo plate 22 attached to a rear cover 21 that constitutes the upper housing 18. It has a multicolor light emitting portion 24 having a high height and a white light emitting portion 25 having a relatively short height.

The logo plate 22 has, for example, a convex portion 26 having an oval cross section corresponding to the shape of an exclamation mark (exclamation mark) and a convex portion 27 having a small circular cross section formed on the flat plate portion 28. The convex portions 26 and 27 are fitted into an oval opening portion 21a and a small circular opening portion 21b formed in the rear cover 21 of the upper casing 18, respectively, and the front end surfaces 26a and 27a are respectively opened to the opening portions 21a and 21a. It arrange | positions so that the peripheral part of the upper surface of the flat plate part 28 may contact | abut to the inner wall face of the rear cover 21 so that it may expose from 21b.
In this example, a thin metal film is formed on the bottom surface of the logo plate 22 by half vapor deposition to enhance the decorativeness, and the white light emitting portion 25 is not visible when not lit.

The multi-color light emitting unit 24 includes a red LED, a green LED, and a blue LED that emit light in three primary colors.
The multicolor light emitting unit 24 is disposed so that the light emitting surface 24 a faces the side end surface 28 a on the convex portion 26 side of the flat plate portion 28 of the logo plate 22, and mainly illuminates the convex portion 26.
In this example, the light emitted from the multicolor light emitting portion 24 is incident on the side end surface 28a of the flat plate portion 28, and is repeatedly reflected on the boundary surface such as the bottom surface 28b. In addition, the light is emitted from the front end surface 26a in a state where the luminance is uniform, and the color mixture of each color light emitted from each LED (red LED, green LED, blue LED) is also promoted and visually recognized.

On the other hand, when it is arranged directly below the bottom surface 28b of the logo plate 22, the light emitted from the multicolor light emitting portion 24 travels substantially straight over a relatively short distance in the logo plate 22 directly upward. As a result, the luminance is not uniform, and the light emitted from the tip surface 26a is also viewed in an incomplete state, and the illumination display quality deteriorates. Resulting in.
As described above, the height of the multicolor light emitting unit 24 is slightly higher than the height of the white light emitting unit 25 so that the light emitted from the multicolor light emitting unit 24 is incident from the side end face 28a. Will be set.
In this example, the multicolor light emitting unit 24 can change various colors and light emission intensity by PWM (Pulse Width Modulation) control of the current in the LED driving unit 8.

The white light emitting unit 25 includes, for example, a single high-intensity white LED having a blue LED and a fluorescent plate mixed with a fluorescent material that emits yellow light by blue light emitted from the blue LED.
The white light emitting unit 25 is disposed in a region immediately below the convex portion 27 on the bottom surface 28b of the flat plate portion 28 of the logo plate 22 so that the light emitting surface 25a faces the main surface, and mainly illuminates the convex portion 27.
In this example, the white light emitting unit 25 can perform flash illumination display by the pulse current supplied from the LED driving unit 8.

  In the light source mounting structure 31 of this example, the FPC 23 on which the multicolor light emitting unit 24 and the white light emitting unit 25 are mounted is a lower surface (second housing 18 on which the display unit 9 is disposed) as the second surface of the holding frame 32. And a wiring board 33 on which various electronic components are mounted is attached to the upper surface (the rear surface of the upper housing 18) as the first surface of the holding frame 32. The color light-emitting portion 24 passes through the openings 32a and 33a formed in the holding frame 32 and the wiring board 33 and the tips thereof are exposed, and the white light-emitting portion 25 is disposed in the opening 32b formed in the holding frame 32. A predetermined portion of the logo plate 22 attached to the holding frame 32 so that the front end surfaces 26a and 27a are exposed from the openings 21a and 21b of the rear cover 21, respectively. As 25 to illuminate the structure it has been made.

As shown in FIG. 1, the FPC 23 is connected to the main wiring part 23a connected to the wiring board 33, the branch wiring parts 23b and 23c branched from the main wiring part 23a, and the branch wiring part 23b. A light source unit (not shown) connected to the illumination LED mounting portion 23d on which the light emitting portion 24 and the white light emitting portion 25 are mounted and the branch wiring portion 23c, and includes a plurality of backlight LEDs on the lower surface side (front side). ) Is mounted on the backlight LED mounting portion 23e.
The multicolor light emitting part 24 and the white light emitting part 25 are electrically connected to the wiring board 33 via the illumination LED mounting part 23d, the branch wiring part 23b, and the main wiring part 23a of the FPC 23.

Openings 32a and 32b are formed in predetermined portions of the holding frame 32, and an FPC insertion hole 32c for inserting the branch wiring portion 23b of the FPC 23 is formed in the vicinity of the opening 32b. In the region including the edges of the openings 32a and 32b on the lower surface side (front side) of the holding frame 32, a shallow concave portion 32d for fitting and attaching the illumination LED mounting portion 23d of the FPC 23 is formed. On the upper surface side (rear surface side) of the holding frame 32, a shallow concave portion 32e for fitting and attaching the main wiring portion 23a and the branch wiring portions 23b and 23c of the FPC 23 is formed.
The FPC 23 is inserted into the FPC insertion hole 32c in the vicinity of the opening 32a in which the white light emitting unit 25 is disposed, and the branch wiring portion 23b is not disposed on the lower surface side of the holding frame 32 but is disposed on the upper surface side. .

As a result, the branch wiring portion 23b is disposed on the lower surface side of the holding frame 32, and is connected to the backlight LED mounting portion 23e or the branch wiring portion 23c at the end on the side where the backlight LED is disposed. In such a case, it is necessary to provide a notch for passing the branch wiring portion 23b at the end of the holding frame 32 on the side where the backlight LED is disposed. Since it is not necessary to provide a notch in the holding frame 32, a predetermined rigidity of the holding frame 32 can be ensured.
As will be described later, a liquid crystal display panel 35 and an optical member group 36 constituting a liquid crystal display device are disposed on the lower surface side of the holding frame 32.
An opening 33 a for exposing the logo plate 22 is formed in a region corresponding to the region of the holding frame 32 where the openings 32 a and 32 b of the wiring substrate 33 are arranged.

The wireless communication unit 6 includes an RF circuit, a modulation / demodulation circuit, a baseband processing circuit, and the like. The wireless communication unit 6 modulates voice and data and transmits the radio wave via the antenna 7 and receives the radio wave via the antenna 7. Are used to perform voice communication and data communication according to a predetermined protocol.
The display unit 8 is disposed on a front side surface that is an inner side when the upper casing 18 is folded, and includes, for example, a transmissive liquid crystal display device. The liquid crystal display device includes a liquid crystal display panel 35, a backlight device that provides illumination light to the liquid crystal display panel 35, and a drive circuit that drives the liquid crystal display panel 35.

The liquid crystal display panel 35 is a transmissive liquid crystal display panel having a TFT (Thin Film Transistor) structure, for example, and has a TFT substrate on which a large number of TFTs and transparent pixel electrodes are formed, and a gap of several [μm] from the TFT substrate. A counter substrate fixed opposite to each other and having a colored layer (color filter) formed thereon, a liquid crystal layer sealed in the gap, a TFT substrate, and a pair of deflection plates disposed outside the counter substrate. Have.
The backlight device includes a light source unit including a plurality of (for example, four) LEDs as a point light source, and a light guide plate that receives light emitted from the light source unit and emits planar illumination light toward the liquid crystal display panel 35. An optical member group 36 including a diffusion sheet for correcting variation in luminance and a prism sheet for condensing illumination light incident from the light guide plate side, and the illumination light is applied to the liquid crystal display panel 35 from the back side. Irradiate and allow the observer to visually recognize the light transmitted through the liquid crystal display panel 35. The light source unit is electrically connected to the wiring board 33 via the backlight LED mounting portion 23e, the branch wiring portion 23c, and the main wiring portion 23a that constitute the FPC 23.
An optical member group 36 is disposed on the lower surface side of the holding frame 32, and the liquid crystal display panel 35 is interposed, for example, via a frame-shaped double-sided adhesive sheet in a state where the optical member group 36 is sandwiched between the holding frame 32. Is fixed.

  The operation unit 11 is a browser mode selection key for starting a browser and browsing a home page, a determination key used for determining an operation, a menu key for displaying an operation menu, and an input for switching a character input mode. Mode switch key, phone book key for registering and searching the phone book, call start key used for making a voice call, clear key to return the operation to the previous state, and various types of power on / off A function key group including a power key used for canceling the operation, a cursor key for moving the cursor on the display screen displayed on the display unit 8 in the vertical and horizontal directions, and for inputting numbers, for example. A numeric keypad group.

To assemble the cellular phone 1 of this example, first, the logo plate 22 is bonded to a predetermined portion on the upper surface side of the holding frame 32.
Next, on the lower surface side of the holding frame 32, the FPC 23 in which the multicolor light emitting part 24 and the white light emitting part 25 are mounted on the illumination LED mounting part 23 d is arranged so that the multicolor light emitting part 24 penetrates the opening 32 a. And it attaches to the holding frame 32 from the lower surface side of the holding frame 32 so that the white light emission part 25 is arrange | positioned in the opening part 32b.
Here, the illumination LED mounting portion 23d is fitted into the recess 32d, and the branch wiring portion 23b connected to the illumination LED mounting portion 23d is inserted into the FPC insertion hole 32c and is fitted into the recess 32e.

Next, the liquid crystal display panel 35 is fixed to the lower surface side of the holding frame 32 with the optical member group 36 sandwiched between the holding frame 32, for example, via a frame-shaped double-sided adhesive sheet.
Next, the FPC 23 having the logo plate 22 attached on the upper surface side and the multicolor light emitting portion 24 and the white light emitting portion 25 mounted on the lower surface side, the optical member group 36, and the liquid crystal display panel 35 are attached. From above the holding frame 32, the wiring board 33 is overlaid so that the tip of the multicolor light emitting portion 24 is exposed from the opening 33a and the convex portions 26 and 27 of the logo plate 22 are exposed. Assemble. Here, the end portion of the main wiring portion 23 a is connected to a connector (not shown) disposed at the end portion of the wiring board 33.
The multicolor light emitting part 24 and the white light emitting part 25 are electrically connected to the wiring board 33 via the illumination LED mounting part 23d, the branch wiring part 23b, and the main wiring part 23a of the FPC 23.
Next, the rear cover 21 is put on the wiring board 33 so that the front end surfaces 26a and 27a of the logo plate 22 are exposed from the openings 21a and 21b, respectively.

Here, the lower part of the relatively tall multicolor light emitting portion 24 is disposed in the opening portion 32a of the holding frame 32 (that is, the multicolor light emitting portion 24 includes the opening portion 32a of the holding frame 32 and the wiring board. The upper light emitting surface 24a is disposed to face the side end surface 28a of the flat plate portion 28 of the logo plate 22 disposed in the opening 33a of the wiring board 33. In addition, the relatively short white light emitting unit 25 is disposed in the opening 32a of the holding frame 32 (that is, the white light emitting unit 25 penetrates the opening 32a of the holding frame 32) and the light emitting surface. 25a is disposed opposite to the bottom surface 28b of the flat plate portion 28 of the logo plate 22 disposed in the opening 33a.
From the wiring board 33, the tip of the multicolor light emitting unit 24 of the multicolor light emitting unit 24 and the white light emitting unit 25 slightly protrudes. As a result, the distance D1 between the upper surface of the wiring board 33 and the rear surface of the rear cover 21 is shortened as compared with the case where the multicolor light emitting part 24 and the white light emitting part 25 are mounted on the wiring board 33. In this example, the distance is shortened by at least the total thickness (for example, 1.7 mm) of the wiring board 33 and the holding frame 32 as compared with the prior art, which contributes to thinning of the device.

After the power is turned on, the control unit 3 enters a standby mode for waiting for an input operation or an incoming call by the operator, and causes the display unit 9 to display a standby screen. In this state, when there is an incoming call, the control unit 3 controls the LED driving unit 8 to blink each LED constituting the multicolor light emitting unit 24 and the white light emitting unit 25.
In this example, the multicolor light-emitting unit 24 blinks with various colors or varying the light emission intensity by PWM control of the current in the LED drive unit 8.
The light emitted from the light emitting surface 24a on the upper side of the multicolor light emitting portion 24 toward the side logo plate 22 is incident on the logo plate 22 from the opposite side end surface 28a and is reflected by, for example, the bottom surface 28b. The light is emitted from the tip surface 26a of the convex portion 26 having an oval cross section and is visually recognized by an observer.
Further, the white light emitting unit 25 blinks by the pulse current supplied from the LED driving unit 8. The light emitted from the light emitting surface 25a at the tip of the white light emitting unit 25 toward the upper logo plate 22 enters the logo plate 22 from the region immediately below the convex portion 27 having a small circular cross section on the opposed bottom surface 28b. The light passes through the logo plate 22 and is emitted from the tip end surface 27a of the convex portion 27 and is visually recognized by an observer.
Thus, the light emitting unit 7 displays the emblem as an illumination.

Thus, according to the configuration of this example, the multicolor light emitting unit 24 and the white light emitting unit 25 are mounted on the FPC 23 and attached to the holding frame 32 from the lower surface side of the holding frame 32. Since the white light emitting part 25 penetrates the opening 32a of the holding frame 32, the multicolor light emitting part 24 and the white light emitting part 25 are wired through the opening 32a of the holding frame 32 and the opening 33a of the wiring board 33. Compared to the conventional technology mounted on the substrate 33, at least the total thickness of the holding frame 32 and the wiring substrate 33 can be reduced, and the mounting density can be improved and the device can be made thinner. it can.
Further, since the branch wiring portion 23b of the FPC 23 is disposed on the upper surface (rear surface) side of the holding frame 32, by arranging the branch wiring portion 23b on the lower surface (front surface) side, the end portion of the holding frame 32 (LED for backlight is disposed). Therefore, it is not necessary to provide a notch on the side where the liquid crystal display panel is provided, and the liquid crystal display panel can be securely held while ensuring the necessary rigidity.

FIG. 6 is a cross-sectional view for explaining the structure of a light source mounting structure for a mobile phone according to a second embodiment of the present invention.
The difference between this example and Example 1 described above is that the light emitting part is composed of a multicolor light emitting part and a white light emitting part, whereas the white light emitting part is omitted.
Since the other configuration is substantially the same as the configuration of the first embodiment described above, the description thereof will be simplified.

As shown in FIG. 6, the light emitting unit 7 </ b> A in this example includes a logo plate 22 attached to the rear cover 21 that constitutes the upper housing 18, and a multicolor light emitting unit 24 mounted on the FPC 23. ing.
The multicolor light emitting portion 24 has a red LED, a green LED, and a blue LED that respectively emit light in the three primary colors, and the light emitting surface 24a on the side end surface 28a on the convex portion 26 side of the flat plate portion 28 of the logo plate 22. Are arranged so as to face each other and illuminate the convex portions 26 and 27.

In the light source mounting structure 31A of this example, the FPC 23 on which the multicolor light emitting unit 24 is mounted is attached to the lower surface of the holding frame 32, and the wiring board 33 is attached to the upper surface of the holding frame 32. Passes through the openings 32a and 33a formed in the holding frame 32 and the wiring board 33 and the tips thereof are exposed, and the tip surfaces 26a and 27a are exposed from the openings 21a and 21b of the rear cover 21, respectively. The multi-color light emitting unit 24 is configured to illuminate a predetermined portion of the logo plate 22 attached to the.
At the time of an incoming call or a call, the light emitted from the light emitting surface 24a on the upper side of the multicolor light emitting unit 24 toward the side logo plate 22 enters the logo plate 22 from the opposite side end surface 28a. The light is reflected by the bottom surface 28b, is emitted from the front end surfaces 26a and 27a of the convex portions 26 and 27, and is visually recognized by an observer.

  According to the configuration of this example, substantially the same effect as that of the first embodiment described above can be obtained.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention.
For example, in the above-described embodiments, a case where a point light source such as an LED is mounted on a housing as a small component has been described. However, the present invention is not limited to a light source, and may be applied to a case where an infrared light receiving element or the like is mounted. The present invention is not limited to optical components, and is generally suitable for application to small components such as speakers and microphones that are generally mounted near the surface of a housing. Further, the light source is not limited to a point light source but may be a linear light source.
In addition, for example, an electronic camera unit that photographs surrounding scenery or a person may be provided to add a photographing function or a videophone function. Corresponding to this, a strobe light emitting function may be added to the light emitting unit for performing strobe light emission as necessary during photographing.

Moreover, you may provide an auxiliary | assistant display part in the back side of a housing | casing.
When an auxiliary wiring board is provided in addition to the main wiring board, the LED of the light emitting unit may be mounted on the auxiliary wiring board instead of the FPC.
In addition, the case where the present invention is applied to the light emitting section for incoming notification and illumination display has been described, but the present invention may be applied to, for example, an illuminating section that illuminates a key button of the operation section.
In addition, the case where the same illumination pattern is used for displaying the incoming call and the call is described. However, different illumination patterns may be adopted as a matter of course.
Further, the light emitting units are not limited to one place or two places, and may be provided at three places or more.

Further, the red LED, the green LED, and the blue LED of the multicolor light emitting unit are not limited to one each, and a plurality of them may be provided or may not be the same number. Moreover, you may make it use not only red, green, and blue but LED whose luminescent color is orange, yellow, and yellow-green. Moreover, you may arrange | position by adding white LED.
Further, the multicolor light emitting unit is not limited to three types (three colors) of LEDs, and may be composed of four or more types of LEDs, or may be two types. Further, instead of the multicolor light emitting unit, for example, one type of LED among red LED, green LED, and blue LED may be selected to be a single color light emitting unit.
In the above-described embodiments, the case where the shape of the exclamation mark is selected as the shape of the opening of the upper housing and the logo plate corresponding to the emblem has been described, but the shape is not limited to this.
Further, the light source of the light emitting unit may serve as the light source of the backlight.
In addition, the size of the opening formed in the holding frame can be adjusted within a range in which rigidity necessary for holding the wiring board, the liquid crystal panel, and the like is secured.

In the embodiment described above, the case where the insertion hole of the FPC 23 is provided separately from the opening 32b has been described. However, as shown in FIG. 7, in the light source mounting structure 31B, the white light emitting unit 25 is arranged on the holding frame 32B. In addition, an opening 32m serving also as an FPC insertion hole may be formed, and the FPC 23 may be inserted through the opening 32m. Further, the FPC 23 may be pulled out from the opening 32a. Thereby, the opening area formed in the holding frame 32 can be suppressed.
In the above-described embodiment, the case where the multicolor light emitting unit 24 as a small component penetrates the holding frame 32 and the wiring board 33 or the white light emitting unit 25 is disposed in the opening 32b of the holding frame 32 is described. However, of course, the tip surface of the small component may be disposed in the opening 33a.

  As a portable electronic device, in addition to a cellular phone, the present invention can be applied to a simple cellular phone (PHS) terminal, a personal digital assistant (PDA), and a portable computer.

It is a disassembled perspective view for demonstrating the structure of the light source mounting structure of the mobile telephone which is 1st Example of this invention. It is a perspective view which shows the structure of the mobile phone. It is a block diagram which shows the structure of the mobile phone. It is sectional drawing for demonstrating the structure of the light source mounting structure. It is sectional drawing which fractures | ruptures and shows the structure of the light source mounting structure partially. It is sectional drawing for demonstrating the structure of the light source mounting structure of the mobile telephone which is 2nd Example of this invention. It is sectional drawing for demonstrating the structure of the light source mounting structure of the mobile telephone which is a modification of 1st Example of this invention. It is explanatory drawing for demonstrating a prior art. It is explanatory drawing for demonstrating a prior art.

Explanation of symbols

1 Mobile phone (portable electronic device)
2 Housing 7, 7A Light emitting unit 8 LED driving unit 9 Display unit 18 Lower housing 19 Upper housing 21 Rear cover 21a, 21b Opening (part of window, housing opening)
22 Logo plate (part of window, illuminated plate)
23 FPC
23b Branch wiring part (connection wiring board)
23d LED mounting part for illumination (second board, flexible wiring board)
24 Multicolor light emitting part (small parts, point light source)
25 White light emitting part (small parts, point light source)
26, 27 Convex portion 28 Flat plate portion 31, 31A, 31B Light source mounting structure (small component mounting structure)
32, 32B Holding frame (holding base)
32a, 32b Opening (base opening)
32c FPC insertion hole (wiring board insertion hole)
32m opening (base opening, wiring board insertion hole)
33 Wiring board (first board)
33a opening (substrate opening)
35 Liquid crystal display panels (plate parts)
36 Optical members (plate-like parts)

Claims (23)

A small component mounting structure in which a small component is mounted on a casing of a portable electronic device,
A first substrate is disposed on the first surface side of a holding base body having first and second surfaces facing away from each other, and a second substrate is disposed on the second surface side. A component is mounted on the second substrate, and a base opening and a substrate opening are formed in the holding base and the first substrate, respectively.
The holding base and the first and second substrates are arranged such that the substrate opening is disposed in the vicinity of the inner wall surface of the housing, and the mounting area of the small component on the second substrate is A small component mounting structure in a portable electronic device, wherein the base opening of the holding base and the board opening of the first substrate are arranged so as to overlap each other.   2. The small component mounting structure in a portable electronic device according to claim 1, wherein the small component is mounted on the second substrate in a state of passing through the base opening and the substrate opening. .   The small size of the portable electronic device according to claim 1 or 2, wherein the small component is mounted on the second substrate in a state where at least a part of the small component is disposed in the base opening. Component mounting structure.   4. The small component mounting structure in a portable electronic device according to claim 1, wherein the second substrate is made of a flexible wiring board.   5. A small component mounting structure in a portable electronic device according to claim 4, wherein a plate-like component is disposed on the second surface side of the holding base with the second substrate interposed therebetween.   The small component has a point light source, and the base opening and the substrate opening are arranged so that light emitted from the point light source is emitted from a window provided in the housing. 6. A small component mounting structure in a portable electronic device according to claim 1, wherein the structure is a small component mounting structure.   7. The small component mounting structure in a portable electronic device according to claim 5, wherein the plate-like component is an optical component constituting a liquid crystal display device.   8. The small component mounting structure in a portable electronic device according to claim 7, wherein the optical component includes a light guide plate of a backlight device.   9. The portable electronic device according to claim 6, wherein the window is formed by fitting an illuminated plate illuminated by the point light source into a housing opening formed in the housing. Small component mounting structure in equipment.   10. The small component mounting structure in a portable electronic device according to claim 9, wherein the casing opening and the illuminated plate are shaped so as to form a predetermined pattern.   11. The small component mounting structure in a portable electronic device according to claim 6, wherein the point light source is a light emitting diode. 11.   A wiring board insertion hole for inserting a connection wiring board made of a flexible wiring board connected to the second substrate is formed in the vicinity of the base opening of the holding base, and one end of the wiring board insertion hole is formed in the wiring board insertion hole. 12. The small component mounting structure in a portable electronic device according to any one of claims 4 to 11, wherein the connection wiring board through which the portion is inserted is disposed on the first surface side.   13. The small component mounting structure in a portable electronic device according to claim 12, wherein the connection wiring board is connected to a connection wiring board connected to the backlight device constituting the liquid crystal display device. A light source mounting structure in which a point light source is mounted on a casing of a portable electronic device,
A first substrate is disposed on the first surface side of a holding base body having first and second surfaces facing away from each other, and a second substrate is disposed on the second surface side. A light source is mounted on the second substrate, and a base opening and a substrate opening are formed in the holding base and the first substrate,
The holding base and the first and second substrates are such that the substrate opening is disposed in the vicinity of the inner wall surface of the housing, and the point light source mounting region on the second substrate And the base opening of the holding base and the substrate opening of the first substrate are overlapped,
The point light source is mounted on the second substrate in a state of penetrating the base opening and the substrate opening, or at least a part of which is disposed in the base opening.
The light source in the portable electronic device, wherein the base opening and the substrate opening are arranged so that light emitted from the point light source is emitted from a window provided in the casing. Mounting structure.   A portable electronic device comprising the small component mounting structure in the portable electronic device according to any one of claims 1 to 13. A flexible wiring board arrangement method used in a small component mounting structure in which a small component is mounted on a casing of a portable electronic device,
A substrate opening corresponding to the substrate opening on the first surface side of the holding substrate having first and second surfaces facing each other and having a substrate opening and a wiring board insertion hole formed in a predetermined portion. A first substrate having a portion formed thereon, and a second substrate comprising a flexible wiring board on which the small component is mounted on the second surface side,
A connection wiring board made of a flexible wiring board is connected to the second substrate in a state where one end of the connection wiring board is inserted into the wiring board insertion hole, and at least an intermediate part thereof is arranged on the first surface side, and the other end A flexible wiring board arranging method used in a small component mounting structure, wherein the part is connected to the first substrate.   The flexible wiring used in the small component mounting structure according to claim 16, wherein the small component is mounted on the second substrate in a state of penetrating the base opening and the substrate opening. Board arrangement method.   18. The small component mounting structure according to claim 16, wherein the small component is mounted on the second substrate in a state where at least a part of the small component is disposed in the opening of the base body. Flexible wiring board placement method.   The flexible wiring board arrangement method used in the small component mounting structure according to claim 16, wherein the wiring board insertion hole also serves as the base opening.   The flexible wiring board placement method used in a small component mounting structure according to claim 16, 17 or 18, wherein the wiring board insertion hole is formed in the vicinity of the opening of the base.   The small component has a point light source, and the base opening and the substrate opening are arranged so that light emitted from the point light source is emitted from a window provided in the housing. The flexible wiring board arrangement method used in the small component mounting structure according to any one of claims 16 to 20, wherein the flexible wiring board arrangement method is used.   The backlight device which comprises a liquid crystal display device on both sides of the said 2nd surface of the said holding | maintenance base | substrate is arrange | positioned, The one of Claim 16 thru | or 21 characterized by the above-mentioned. The flexible wiring board arrangement method used in the described small component mounting structure. The flexible wiring board arrangement method used in the small component mounting structure according to claim 22, wherein the connection wiring board is connected to a connection wiring board connected to the backlight device.

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