WO2006100914A1

WO2006100914A1 - Portable device with built-in fm transmitter

Info

Publication number: WO2006100914A1
Application number: PCT/JP2006/304466
Authority: WO
Inventors: Hiroshi Miyagi; Takeshi Ikeda; Akira Okamoto
Original assignee: Niigata Seimitsu Co., Ltd.
Priority date: 2005-03-18
Filing date: 2006-03-08
Publication date: 2006-09-28
Also published as: TW200637179A

Abstract

A portable device with a built-in FM transmitter, in which an antenna is less likely to be damaged and an antenna receiving space is easily obtained. A portable music playback device has an audio playback device for generating an audio signal to be transmitted, a stereo modulation circuit and an FM modulation circuit that FM-modulate the audio signal to generate a carrier wave signal that can be received by an FM receiver, and a transmission circuit for transmitting the carrier wave signal through a transmission antenna (40). An audio signal generation circuit, the modulation circuits, and the transmission circuit are formed on a printed board (200). A loop-like conductor (40A) is formed along the outer peripheral surface of a housing (300) for receiving the printed board (200) and is used as a transmission antenna.

Description

Specification

Mobile device with built-in FM transmitter

Technical field

TECHNICAL FIELD [0001] The present invention relates to a portable device having an FM transmitter including an FM transmitter that transmits an FM-modulated signal.

Background art

[0002] Conventionally, mobile devices such as mobile phones with built-in FM transmitters are known (for example, see Patent Document 1). Audio can be output from an external FM receiver. This makes it possible to output sound generated by a portable device that does not have the power from an external speaker, or to improve sound quality and ensure volume compared to using a small built-in speaker. It becomes possible. Further, as an antenna connected to an FM transmitter built in a portable device, an externally attached rod-shaped antenna is known (for example, see Patent Document 2).

Patent Document 1: Japanese Unexamined Patent Publication No. 2001-197168 (Page 3-6, Fig. 1-5)

Patent Document 2: Japanese Patent Laid-Open No. 10-207972 (Pages 4-7, Fig. 1-9)

Disclosure of the invention

Problems to be solved by the invention

[0003] By the way, when the rod-shaped antenna is always externally attached as disclosed in Patent Document 2 described above, the rod-shaped antenna protrudes from the housing force, which may cause damage during storage or transportation. . Although there may be a case where such a rod-shaped antenna is built in, there is a problem that it becomes difficult to secure a space for housing the rod-shaped antenna in the housing as the apparatus is miniaturized.

[0004] The present invention was created in view of these points, and an object of the present invention is to provide a portable device with a built-in FM transmitter that can easily secure an antenna storage space with less risk of damage to the antenna. There is to do.

Means for solving the problem [0005] In order to solve the above-described problems, a portable device incorporating an FM transmitter according to the present invention includes an audio signal generation circuit that generates an audio signal to be transmitted, and an FM receiver by FM-modulating the audio signal. A modulation circuit that generates a carrier wave signal that can be received by a transmitter and a transmission circuit that transmits a carrier wave signal through a transmission antenna, and an audio signal generation circuit, a modulation circuit, and a transmission circuit are formed on one or more printed circuit boards. At the same time, a loop-shaped conductor formed along the outer peripheral surface of the housing that accommodates the printed circuit board is used as a transmitting antenna. Since the loop-shaped conductor formed along the outer peripheral surface of the housing is used as the transmission antenna, it is possible to prevent damage during storage or transportation that prevents the transmission antenna from protruding outside the housing. In addition, it is easier to secure a storage space for the transmission antenna than when the transmission antenna is stored in the housing.

[0006] Further, the outer peripheral surface described above is desirably the widest surface of the housing. As a result, a large transmitting antenna along the widest surface of the housing can be realized.

[0007] Further, it is desirable that the loop-shaped conductor described above can be rotated about a part of the loop-shaped conductor. As a result, the angle of the transmitting antenna can be adjusted according to the arrangement of the FM receiver, and the reception state on the FM receiver side can be improved.

[0008] In addition, it is desirable that the housing described above has a recess that is formed corresponding to the loop conductor and accommodates the loop conductor. Thereby, the convex part of the housing | casing surface which arises with a loop-shaped conductor when a transmitting antenna is tilted to the housing | casing side can be eliminated.

[0009] Further, the above-described casing is composed of first and second divided casings that are opened and closed according to the use state, and the loop conductor is one of the first and second divided casings. On the other hand, it is desirable that it be formed on the side that accommodates the printed circuit board on which the transmission circuit is mounted. This facilitates the connection between the transmission circuit and the transmission antenna, and simplifies the work process for wiring as well as the wiring itself.

[0010] In addition, the casing described above is provided with a liquid crystal display device having a rectangular display surface, and it is desirable that the loop-shaped conductor is formed in a peripheral region of the display surface of the liquid crystal display device. Usually, an area necessary for mounting the liquid crystal display device on the casing is secured around the rectangular display surface of the liquid crystal display device. Therefore, by arranging the loop-shaped conductor in this peripheral area, the peripheral area can be effectively used.

O

Brief Description of Drawings

1—

[FIG. 0] is a diagram showing a configuration of a portable music playback device of one embodiment.

FIG. 2 is a perspective view showing an appearance of a portable music player.

FIG. 3 is a perspective view showing an appearance of a portable music playback device.

FIG. 4 is a plan view showing the shape of a loop conductor.

FIG. 5 is a sectional view taken along line VI—VI in FIG.

6 is a cross-sectional view taken along line VII-VII in FIG.

FIG. 7 is an external perspective view of a portable music player having two divided housings.

FIG. 8 is an external perspective view of a portable music player having two divided housings. Explanation of symbols

Audio playback device

12 Output circuit

20 FM transmitter

22 Stereo modulation circuit

24 FM modulation circuit

26 Transmitter circuit

30 Operation unit

32 Display

34 Control unit

40 Transmit antenna

40A loop conductor

42 pin

44 recess

100 Portable music player

200 PCB

300 cases

300A, 300B split housing

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a portable music player according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is a diagram illustrating a configuration of a portable music playback device according to an embodiment. A portable music playback device 100 of the present embodiment shown in FIG. 1 includes an audio playback device 10, an output circuit 12, an FM transmitter 20, an operation unit 30, a display unit 32, and a control unit 34. Among these configurations, most of the configurations except the operation unit 30 and the display unit 32 are formed on a semiconductor substrate as a one-chip component using a CMOS process or a MOS process (however, they are formed by these processes). Except impossible drive mechanism). By using these processes, it is possible to reduce the size and power consumption of the components formed on the semiconductor substrate and the entire portable music playback device 100.

[0015] The audio reproduction device 10 is an audio signal generation circuit that reproduces and outputs an audio signal by expanding audio data recorded in a compressed format. For example, an MP3 (MPEG Audio Layer-3) player or an MD (Mini-disc) Compatible with players. Note that the audio playback device 10 according to the present embodiment needs at least a function for generating an audio signal to be transmitted, and is a CD (compact disc) player that plays an audio signal from uncompressed audio data or a portable device. The audio playback device 10 may be configured by a voice playback circuit such as a telephone. From the audio playback device 10, the left and right audio signals L and R are output separately. The output circuit 12 outputs a signal obtained by amplifying the audio signal output from the audio playback device 10 or adjusting the sound quality to an earphone (not shown) via the earphone terminal 106.

[0016] The FM transmitter 20 transmits, from the transmission antenna 40, a signal after performing FM modulation on the L signal and the R signal output from the audio playback device 10. For this purpose, the FM transmitter 20 includes a stereo modulation circuit 22, an FM modulation circuit 24, and a transmission circuit 26. The stereo modulation circuit 22 performs a stereo modulation process that combines the input L signal and R signal to generate a stereo composite signal (stereo composite signal). The FM modulation circuit 24 performs FM modulation processing on the stereo composite signal and generates a carrier wave signal that can be received by an external FM receiver (not shown) installed in the vicinity of the portable music player 100. To do. The transmitter circuit 26 increases the carrier signal generated by the FM modulator circuit 24. Widen and transmit from transmit antenna 40.

[0017] The operation unit 30 includes various keys and operation knobs for accepting operations by the user. For example, a “play” key and a “stop” key are provided to give various instructions to the playback operation of the audio signal by the audio playback device 10, and a volume is used to indicate the degree of amplification of the output circuit 12. It has “UP” key and “DOWN” key for setting. The display unit 32 displays the content of operations performed by the operation unit 30 and the content reproduced by the audio playback device 10 (for example, the name of the song being played (song name), the name of the artist who has sung this song, the elapsed playback time, etc.) Is displayed. The control unit 34 controls the entire portable music player 100. For example, the playback state by the audio playback device 10 is set, or the volume is set by using the output circuit 12.

2 and 3 are perspective views showing the external appearance of the portable music playback device 100. FIG. FIG. 2 shows a state in which the transmission antenna 40 is tilted, and FIG. 3 shows a state in which the transmission antenna 40 is upright. As shown in these drawings, a casing 300 of the portable music player device 100 houses therein a printed circuit board 200 in which the components shown in FIG. 1 are mounted and wired. In addition, a loop conductor 40A is formed along the outermost surface of the casing 300 and along the widest surface of the casing 300, and the loop conductor 40A is used as the transmitting antenna 40.

FIG. 4 is a plan view showing the shape of the loop conductor 40A. Fig. 5 is a cross-sectional view taken along line VI-VI in Fig. 4. 6 is a cross-sectional view taken along line VII-VII in FIG. As shown in FIGS. 4 to 6, the loop conductor 40A has a U-shape. The loop-shaped conductor 40A is supported in a state where the vicinity of the end portion is rotatable around the pin 42 as a rotation center. The casing 300 has a recess 44 formed on the outer peripheral surface where the loop-shaped conductor 40A is formed, corresponding to the loop-shaped conductor 40A. The recess 44 is for accommodating the loop-shaped conductor 40A. As shown in FIG. 2, the loop-shaped conductor 40A is accommodated when the loop-shaped conductor 40A is tilted to the housing 300 side. In FIG. 3, the force of the loop conductor 40A is shown in a state where the loop conductor 40A is almost perpendicular (90 degrees) to the outer peripheral surface of the housing 300. The angle of the loop conductor 40A is an arbitrary angle other than 90 degrees (For example, 30 degrees or 60 degrees) may be set. Such a loop-shaped conductor 4 OA is a transmitter circuit 26 mounted on the printed circuit board 200 housed in the housing 300. It is connected to the.

As described above, in the portable music playback device 100 of the present embodiment, the loop-shaped conductor 40A formed along the outer peripheral surface of the casing 300 is used as the transmission antenna 40, so that the transmission antenna 40 Can be prevented from being damaged when being stored or transported. In addition, as compared with the case where the transmission antenna 40 is accommodated in the housing 300, it is easy to secure a storage space for the transmission antenna 40. In particular, by forming the loop-shaped conductor 40A along the widest surface of the casing 300, the large transmitting antenna 40 can be realized.

[0021] Further, since the loop-shaped conductor 40A can rotate about a part of the rotation conductor, the angle of the transmission antenna 40 can be adjusted in accordance with the arrangement of the FM receiver. The reception state on the side can be improved. In addition, a recess 44 is formed on the outer peripheral surface of the housing 300 corresponding to the loop-shaped conductor 40A. Since the loop-shaped conductor 40A can be accommodated in the recess 44, the transmitting antenna 40 is mounted on the housing. The convex part of the surface of the housing 300 caused by the loop-shaped conductor 40A when tilted to the 300 side can be eliminated.

[0022] It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the above-described embodiment, the portable music playback device 100 having the single casing 300 has been described, but the present invention can also be applied to a portable music playback device having a plurality of divided casings.

FIG. 7 and FIG. 8 are external perspective views of a portable music playback device having two divided housings. FIG. 7 shows a state force when the two divided casings 300A and 300B are opened. FIG. 8 shows a state where the two divided casings 300A and 300B are closed. The loop-shaped conductor 40A as the transmission antenna 40 is one of the two divided housings 300A and 300B, and is formed on the side that accommodates the printed circuit board 200 on which the transmission circuit 26 is mounted. In the example shown in FIG. 7, a loop-shaped conductor 40A is formed in the divided casing 300A. This facilitates the connection between the transmission circuit 26 and the transmission antenna 40, and simplifies the work process for wiring as well as the wiring itself.

Further, in the above-described embodiment, the loop-shaped conductor 40A having a U-shape having a number of turns (the number of loops) of less than 1 has been described, but a loop-shaped conductor having a plurality of turns has a casing. You may make it form along the outer peripheral surface of 300. FIG.

[0025] In addition, the case 300 shown in FIGS. 2 and 3 and the divided cases 300A and 30OB shown in FIGS. 7 and 8 are provided with a display unit 32 composed of a liquid crystal display (LCD). Alternatively, a loop conductor that functions as a transmission antenna may be formed in the peripheral region of the liquid crystal display device. Usually, an area necessary for mounting the liquid crystal display device on the casing is secured around the rectangular display surface of the liquid crystal display device. Therefore, by arranging the loop conductor in this peripheral area, the peripheral area can be effectively used.

[0026] The loop conductor may be arranged around various operation keys included in the operation unit 30. For example, when the operation unit 30 with a numeric keypad and other operation keys such as a cellular phone is arranged on one surface of the housing 300 or the like, loop conductors are arranged around the keys. By doing so, the area around the operation unit 30 can be effectively used.

Industrial applicability

[0027] According to the present invention, since the loop-shaped conductor formed along the outer peripheral surface of the casing is used as the transmitting antenna, the transmitting antenna does not protrude outside the casing and is stored or transported. Can be prevented from being damaged. In addition, it is easier to secure the storage space for the transmission antenna than when the transmission antenna is stored in the housing.

Claims

The scope of the claims

[1] an audio signal generation circuit for generating an audio signal to be transmitted;

A modulation circuit for FM-modulating the audio signal to generate a carrier wave signal that can be received by an FM receiver;

A transmission circuit for transmitting the carrier signal through a transmission antenna;

The audio signal generation circuit, the modulation circuit, and the transmission circuit are formed on one or a plurality of printed circuit boards and a loop formed along an outer peripheral surface of a housing that houses the printed circuit boards A portable device with a built-in FM transmitter that uses a shaped conductor as the transmitting antenna.

[2] In claim 1,

The outer peripheral surface is the widest surface of the housing, and is a portable device with a built-in FM transmitter.

[3] In claim 1,

The loop-shaped conductor is a portable device with a built-in FM transmitter that can rotate about a part of the loop-shaped conductor.

[4] In claim 3,

The housing is a portable device with a built-in FM transmitter, which is formed corresponding to the loop-shaped conductor and has a recess for accommodating the loop-shaped conductor.

[5] In claim 1,

The casing has first and second divided casing forces that are opened and closed according to usage conditions.

The loop-shaped conductor is one of the first and second divided housings, and is formed on the side that accommodates the printed circuit board on which the transmission circuit is mounted. A portable device with a built-in FM transmitter .

[6] In claim 1,

The housing includes a liquid crystal display device having a rectangular display surface, and the loop-shaped conductor is formed in a peripheral region of the display surface of the liquid crystal display device, and is a portable device with a built-in FM transmitter.

[7] In claim 1, A CMOS process is a portable device with a built-in FM transmitter in which a structure corresponding to the audio signal generation circuit, the modulation circuit, and the transmission circuit is formed on a semiconductor substrate using a MOS process.

[8] In claim 1,

The audio signal generation circuit is an MP3 player, a portable device with a built-in FM transmitter.

[9] In claim 1,

The audio signal generation circuit is an MD player, a portable device with a built-in FM transmitter.

[10] In claim 1,

The audio signal generation circuit is a CD player.

[11] In claim 1,

The audio signal generation circuit is a mobile phone.