JP4573812B2 - Small module and mobile device with it - Google Patents

Description

  The present invention relates to a small module having a digital broadcast receiving function, which is used in a device such as a mobile phone or a personal computer having a TV receiving function.

In the terrestrial digital broadcasting currently being broadcast, it is possible to provide not only a stationary television but also a mobile device such as a mobile phone with a TV reception function. This service is called one-segment broadcasting, and this service has been started in April 2006 using the UHF band. In the domestic terrestrial digital broadcasting system, one channel is divided into 13 segments, and several segments are superimposed to transmit video, audio, etc., but only one segment is used for mobile applications. Broadcast. The digital radio scheduled to start in October 2006 is a radio broadcast that uses the VHF frequency band, and is a service that sends high-quality audio broadcasts and simple videos. The reception segment uses 1 or 3.
Since a device that receives this one-segment broadcasting needs to be small as represented by a mobile phone, smaller components are required.

  In order to receive one-segment broadcasting, a channel selection circuit for selecting a TV signal transmitted from a broadcasting station for each channel, and a demodulation function for demodulating a digitally modulated signal into a TS (transport stream) signal such as MPEG is required. A product in which these functions are integrated on a single substrate (or IC) is called a TV tuner module. When a TV reception function is provided for mobile use such as a cellular phone, the whip antenna is often used as the antenna. However, it may be difficult to receive all the broadcast bands with the whip antenna alone. In some cases, an RF switch that uses the antenna or changes the antenna length of the whip antenna is required. In particular, in the case of a device that can receive both one-segment broadcasting in the UHF band and digital radio broadcasting in the VHF band, an RF switch is required. Also, in the VHF band, there are many cases where there is an excessive analog broadcast signal adjacent to the UHF band, and in order to suppress performance degradation due to analog broadcast signal interference, an analog interference trap etc. is added, and an RF switch that switches it is necessary It becomes.

2. Description of the Related Art Conventionally, in a mobile application such as a cellular phone, a small module has been used in order to mount a circuit that realizes multiple functions in a device. This small module is described in, for example, Patent Document 1.
JP 2001-308268 A

  In the case of mobile devices, device miniaturization is a very important factor both in terms of design and cost. Therefore, adding a one-segment broadcasting TV tuner module and the above-described RF switch circuit to a device is a major obstacle to downsizing. In addition, mobile devices, particularly mobile phones that have a camera function have become mainstream, and these camera modules are indispensable. The camera module has a height of about 5 to 7 mm, which is considerably larger than the general height of 1.5 mm of the TV tuner module. On the main board of a mobile application device, it is necessary to mount modules and parts for providing these various functions, and it is an issue to keep them in a limited space.

  The present invention is effective for a device for mobile use having such various functions. The TV tuner module and components including the RF switch circuit are arranged on the main board of the device with a minimum occupation area. The present invention provides a small module that enables this.

  In order to solve the above problems, a small module according to the present invention includes a module substrate having a main surface, a TV tuner module having a digital TV broadcast channel selection function and a demodulation function, which is mounted only on the main surface of the module substrate, and A component including an RF switch circuit, a main board disposed on the main surface side of the module board or on the opposite side of the main surface, and a connector for electrically connecting the module board and the main board. The module board is held on the main board via a connector so that a predetermined space is formed between the module board and the main board.

  Moreover, the small module of this invention is good also as a structure by which the module board | substrate is electrically connected to the main board | substrate via the some connector.

  According to the small module of the present invention, the components including the TV tuner module and the RF switch circuit can be arranged on the main board of the device while minimizing the occupied area. By mounting such a small module on a mobile application device, it is possible to reduce the size of the mobile application device having various functions.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a perspective view of a module substrate in the first embodiment. In FIG. 1, a module substrate 1 includes a plurality of components (hereinafter collectively referred to as “components”) including at least a TV tuner module 2 having a digital TV broadcast channel selection function and a demodulation function and an RF switch circuit 3. Is mounted only on the main surface of module substrate 1 (upper surface 1a in the first embodiment). A connector (described later) is connected to the lower surface 1 b of the module substrate 1.

  FIG. 2 is a side view of the small module 4 in the first embodiment. The module substrate 1 is electrically connected to the main substrate 6 via the connector 5 on the lower side 1b of the module substrate 1. Further, it is held by the main board 6 so that a predetermined space 7 is formed between the main board 6 and the connector 5. In the present embodiment, the module substrate 1 is held on the main substrate 6 using two connectors 5, but is held on the main substrate 6 so that a predetermined space 7 is formed by one connector 5. The structure which can be taken is also possible. A space 7 corresponding to the height of the connector 5 is formed between the module substrate 1 and the main substrate 6, and other components 8 necessary for the mobile device are mounted on the main substrate 6 using the space 7. . Therefore, the occupied area on the main board 6 is only the width X of the connector 5, and components such as the TV tuner module 2 and the RF switch 3 do not affect the occupied area of the main board 6. If the height of the connector 5 is arranged near a relatively high component such as the camera module 9 mounted on the main board 6, an obstacle to miniaturization of the entire device can be minimized.

  In the case of the present embodiment, it is effective to reduce the width X of the connector 5 for electrical connection in order to efficiently reduce the occupied area of the main board 6 for providing the module board 1. There is a limit to downsizing the connector due to electrical factors such as a decrease in contact resistance and structural factors such as strength. Another method is to reduce the number of electrically connected wires. A voltage regulator circuit 10 is mounted on the module substrate 1. The regulator circuit 10 is a circuit for stably transforming a voltage. The TV tuner module 2 and the like often operate with a plurality of voltages of about three systems, and an appropriate voltage may be required for the RF switch 3 as well. In such a case, if a plurality of power supply lines are connected via the connector 5, the number of terminals of the connector 5 increases and the width X of the connector 5 cannot be reduced. However, by providing the regulator circuit 10 in the small module 4, The number of terminals of the connector 5 is reduced, and as a result, the occupied area for connecting the module board 1 in the main board 6 can be reduced.

  Since the TV tuner module 2 is small in size, the TV tuner module 2 is often relatively weak against shock. However, since the connector 5 performs electrical connection and mechanical support to the main board 6, the shock received by the main board 6 can be absorbed by the connector 5. . Thus, the additional effect of being excellent in impact resistance can also be obtained. Further, since the connection is made via the connector 5, it is easy to replace the component on the module substrate 1 when it is defective. Further, in the connection via the connector 5, the extra reflow process can be reduced in the soldering operation between the component and the main board 6, so that the cause of the soldering failure is reduced.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a side view of the small module according to the second embodiment. In the present embodiment, the same configurations as those of the small module in Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted. In the small module 11 of the present embodiment, as shown in FIG. 3, a shield plate is provided so as to cover parts including a TV tuner module 2 having a digital TV broadcast channel selection function and a demodulation function and an RF switch circuit 3. 12 is arranged. In recent years, devices for mobile applications have become multifunctional and various circuits have been developed on the same substrate. However, these circuits also operate at high speed, and thus radiate a lot of noise at frequencies close to the reception band of the TV tuner module 2. ing. These noises cause deterioration in sensitivity with respect to the TV tuner module 2. In order to remove this noise, providing the shield plate 12 is an effective measure. By providing the shield plate 12, the small module 11 can be disposed closer to the noise source (camera module 9 in the drawing), and the restriction on the arrangement on the main board 6 is reduced.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to FIGS. 4, 5, and 6. FIG. In the third embodiment, the same configurations as those of the small module in the first embodiment are denoted by the same reference numerals and description thereof is omitted. FIG. 4 is a perspective view of the module substrate in the third embodiment. In the present embodiment, a TV tuner module 2 having a digital TV broadcast channel selection function and a demodulation function and components including the RF switch circuit 3 are mounted only on the lower surface 1b which is the main surface of the module substrate. A connector (described later) is connected to the lower surface 1 b of the module substrate 1.

  FIG. 5 is a side view of the small module 13 according to the third embodiment. In the present embodiment, the module substrate 1 is electrically connected to the main substrate 6 via the connector 5 on the lower side 1 b of the module substrate 1. Further, it is held by the main board 6 so that a predetermined space 7 is formed between the main board 6 and the connector 5. In the small module 13 of the third embodiment, the space 7 is formed by subtracting the height of the component mounted on the module substrate 1 from the height of the connector 5. In this space 7, other parts 8 of the mobile device can be mounted. For this reason, as in the case of the other embodiments, the occupied area for connecting the module substrate 1 to the main substrate 6 is substantially only the width X of the connector 5, which hinders downsizing of the device. Factors can be minimized.

  Further, since the upper surface 1a of the module substrate 1 in the present embodiment is not mounted with components and is formed as a flat surface, as shown in FIG. 6, a casing (case) 14 of a device for mobile use or the like is brought into direct contact. This also makes it possible to reduce the restrictions in designing the device.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a side view of the small module 15 according to the fourth embodiment. In the present embodiment, the same configurations as those of the small module in Embodiment 3 are denoted by the same reference numerals, and description thereof is omitted. In the small module 15 of the present embodiment, as shown in FIG. 7, a shield is provided so as to cover parts including a TV tuner module 2 having a digital TV broadcast channel selection function and a demodulation function and an RF switch circuit 3. The plate 16 is arranged. In the present embodiment, the ground pattern 17 connected to the ground (not shown) of the mobile device body is provided on the upper surface 1a opposite to the component mounting surface of the lower surface 1b, which is the main surface of the module substrate 1. It is formed as a pattern of substrate wiring. With such a configuration, the shield plate 16 and the ground pattern 17 sandwich the components on the module substrate 1, so that noise from the upper side of the small module 15 is also reduced to noise N from the lower side. Resistance can also be obtained.

(Embodiment 5)
A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a side view of the small module 18 according to the fifth embodiment. FIG. 9 is a perspective view of a shield plate in the fifth embodiment. In the present embodiment, the same configurations as those of the small module in Embodiment 3 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 8, in the small module 18 of the present embodiment, a part of the shield plate 19 is soldered to the main board 6 with solder 20. As shown in FIG. 9, the shield plate 19 has protrusions 19 a and 19 b for soldering to the main board 6 and the module board 1. Four protrusions 19a and 19b are provided on the upper side and four on the opposite side, respectively. In particular, the lower protrusion 19b is soldered to the main board 6 to increase the fixing strength, and the ground side (earth / ground) of the main board 6 and the ground side of the small module 18 are electrically connected. Can also improve the shielding effect.

The heights of these protrusions 19a and 19b are substantially the same as the height of the connector 5 when they are aligned vertically, and these protrusions 19a and 19b are also useful for fixing and stabilizing the position of the connector 5. In FIG. 9, the connector 5 is arranged between the adjacent protrusions 19a and 19a for soldering with the module substrate 1, but a connector hole (not shown) is provided in the shield plate 19, There is no problem even if the connector 5 is protruded from the hole. In FIG. 9, a part of the shield plate 19 is bent to form a bent portion 19c. By forming the bent portion 19c, the bending strength of the shield plate 19 can be increased.
In addition, since all the shield plates 12, 16, and 19 in the third to fifth embodiments cover the regulator circuit 10, they also serve as the heat radiating plate of the regulator circuit 10.

  The small module of each of the embodiments described above can be used for a device for a mobile phone including a PHS in which a camera module is standard equipment. In addition to the mobile phone, the small module of each embodiment can be used for a smartphone (a mobile phone with a built-in computer and capable of processing other than calls), a PDA (personal digital assistant), a DSC (digital camera), an electronic notebook, and the like. Can be used.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The small module of the present invention makes it possible to arrange a TV tuner module and components including an RF switch circuit on the main board of the device while minimizing the occupied area, and for a mobile application device having various functions. Effective for miniaturization, mobile phones, smartphones (mobile phones with built-in computers and capable of processing other than calls), PDAs (personal digital assistants), DSCs (digital cameras), electronic notebooks, etc. It can be used for mobile applications.

It is a perspective view of the module board in Embodiment 1 of the present invention. It is a side view of the small module in Embodiment 1 of this invention. It is a side view of the small module in Embodiment 2 of this invention. It is a perspective view of the module board in Embodiment 3 of this invention. It is a side view of the small module in Embodiment 3 of this invention. It is a sectional side view of the small module including the housing | casing in Embodiment 3 of this invention. It is a side view of the small module in Embodiment 4 of this invention. It is a side view of the small module in Embodiment 5 of this invention. It is a perspective view of the shield board in Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Module board | substrate, 2 TV tuner module with TV broadcast channel selection function and demodulation function, 3 RF switch circuit, 4, 11, 15, 18 Small module, 5 Connector, 6 Main board, 7 Predetermined space, 10 Voltage regulator Circuit, 12, 16, 19 Shield plate, 17 Ground pattern, 19a, 19b Protrusion, 19c Bending part.

Claims (7)

A module substrate having a main surface;
A component including a TV tuner module having a digital TV broadcast channel selection function and a demodulation function and an RF switch circuit mounted only on the main surface of the module substrate;
A main board disposed on the main surface side of the module board;
A connector for electrically connecting the module substrate and the main substrate;
The module board is held on the main board via the connector so that a predetermined space is formed between the module board and the main board ,
The connector is disposed on the main surface of the module substrate;
The module substrate is electrically connected to the main substrate through the plurality of connectors,
Furthermore, a shield plate that covers at least a part of the component is provided,
The shield plate has a bent portion, a part of which is bent, and the shield plate is formed with protrusions for soldering to the main substrate and the module substrate, and the upper protrusion is formed on the module substrate. Small module with lower protrusion soldered to main board . 2. The small module according to claim 1, wherein a total height of the upper protrusion and the lower protrusion is substantially equal to a height of the connector. Equipped with a voltage regulator circuit to the module substrate, a small module of claim 1 or 2. The small module according to claim 3 , further comprising a shield plate that covers the regulator circuit, wherein the shield plate also serves as a heat sink of the regulator circuit. The small module according to any one of claims 1 to 4 , wherein a ground pattern is formed on the entire surface of the module substrate opposite to the main surface. The small module according to any one of claims 1 to 5 , which is used for a device for a mobile phone including a PHS. To any of claims 1 to 6 equipped with a small module according, mobile applications device.

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