JPH0747905Y2 - Electronics - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device such as a communication device or an audio device, which has a speaker and has operation buttons (also referred to as key buttons), and particularly relates to an electronic device suitable for a small device such as a portable type. Is.

[Prior art]

In communication devices and audio equipment for portable use,
The use of semiconductors instead of electron tubes and the miniaturization of components have made products smaller and lighter, and handy types have been made compact enough to fit in the palm of your hand. As a general structure of such a microminiaturized device, as illustrated in FIG. 2, the front face of the device is provided with a display 1, an operation button 2, a speaker 3, a microphone 4 and the like necessary for operation and operation, It is typical that the protruding operation knob, antenna, etc. are arranged on the upper surface and the operation switch (PTT switch, etc.) is provided on the side surface. As a designing method for downsizing the equipment, it is a promising means to downsize the individual constituent members and to reduce the surface area of the front surface and the top surface of the equipment mainly by omitting the operation points or making multiple uses.

[Problems to be solved by the device]

In the above description, it is the most orthodox method to downsize the component parts of the device, but there is a restriction to downsize the display device because it causes misunderstanding of the display and reading is difficult. Although the operating button (keyboard) can be considerably downsized as a mechanism, it is restricted in terms of operability because a small operating button or a narrow interval easily causes an erroneous operation because it is pressed with a fingertip and operated. The speaker should have a diameter of about 20 cm because of the vibration characteristics of the diaphragm, but a portable device does not expect bass reproduction, so an effective diameter of about 10 cm is acceptable. Since it is a situation in which only the ones that can be used are used, further miniaturization of this is not desirable in terms of reproduced sound quality and conversion efficiency. Omission of operation points is the first consideration, so there is often no reconsideration, and multiplexing operation points has the advantage of saving space without reducing the range yesterday. , Etc. are already widely used, but the effect of reducing the dedicated area of the keyboard is achieved by multiplexing the key button operation of the keyboard. However, considering the complexity of the circuit for multiplexing and the operation of the shift key, there are many practical problems. Therefore, another type of miniaturization method is desired.

[Means for Solving the Problems]

A front grill (5) for a speaker (3) provided with a slit (51) for voice passage and a slit (52) for projecting the key button (21) in an electronic device having a built-in speaker and having key buttons for operation. ), A plurality of keyboard units (2a to 2n) in which key buttons (21) are arranged, and a slit (62) for passing a voice, and a printed circuit board for connecting a contact circuit by operating the key buttons (21) ( 6) and
A front grill / keyboard for a speaker (3), which is superposed so as to form a switch circuit and integrated by a pressing plate (7), is arranged on the front surface of the speaker.

【Example】

As an embodiment of the present invention, an exploded view of a structure in which a keyboard is assembled on the front surface of the speaker grill is shown in FIG. In FIG. 3, reference numeral 5 denotes a front grill, which may be a part of the front panel of the device or a decorative molding plate. In the drawings, the symbols common to those in FIGS. 1 and 2 are represented by the common symbols. The front grille 5 is provided with a slit 51 for passing a sound wave of the speaker 3 and a slit 52 for mounting the key button 21. Reference numerals 2a to 2n denote keyboard units having a structure in which a plurality of key buttons 21 are connected by a holding plate 22 and a contact surface 23 such as a conductive rubber is added. The contacts of the keyboard are formed by printed wiring on the surface of the flexible printed circuit board 6, and the ends of each wiring are gathered at the connection portion 61 and connected to an external circuit by a multi-connector.
Further, the flexible printed circuit board 6 is provided with slits 62 corresponding to the slits 51 of the front grille 5. The keyboard has key buttons 21 and slits 52 on the front grille 5.
The front grill and the keyboard are completed by inserting the flexible printed circuit board 6 which is the contact substrate so that the side having the printed wiring and the contact point toward the keyboard side, and further stacking and holding the pressing plate 7 together. Of. Since the restraining plate 7 may be the same as the conventional speaker mounting baffle plate, the increase in thickness due to the addition of the keyboard portion is only about 2 to 3 mm. It should be noted that the keyboard portion vibrates due to the sound wave of the speaker 3 to generate a flicker sound. As for the flexible printed circuit board 6 that is most apt to vibrate, the flexible printed circuit board 6 is placed on the holding plate 7. A slit is provided in the same shape as the slit 62, and the flexible printed circuit board 6 and the pressing plate 7 are integrally fixed beforehand with an adhesive, or the flexible printed circuit board 6 and the pressing plate 7 are tightened via a flexible cushion material such as paper or rubber to prevent flicker. Since it is not difficult, there is no practical problem.

[Effect of device]

As is apparent by comparing FIG. 1 showing the outer shape of the device according to the present invention with FIG. 2 showing the conventional type, in the device according to the present invention, the keyboard portion is erased from the surface portion of the conventional type device (or the speaker portion). May be considered to have been deleted)
It is possible to achieve a drastic downsizing equivalent to. Moreover, since the key buttons of the keyboard and the individual members of the speaker do not need to be particularly downsized, there is no negative effect on usability and performance. In addition, if there is no need to downsize the device, it is possible to increase the keyboard key buttons and key button intervals for ease of use, and if the speaker is upsized, there is an advantage that both conversion efficiency and sound quality can be improved. It is extremely advantageous for a membrane speaker, which has recently been put into practical use, to have a large vibration area.

[Brief description of drawings]

 FIG. 1 is an external view of an electronic device to which the present invention is applied. FIG. 2 is an external view of a conventional electronic device. FIG. 3 is an exploded view of the electronic device of the present invention. 1 ... Display device 2 ... Operation buttons 2a to 2n ... Keyboard unit 3 ... Speaker 4 ... Microphone 5 ... Front grill 6 ... Flexible printed circuit board 7 ... Suppressor plate 21 ... Key button 22 ... Holding Plate 23 …… Contact surface 51,52,62 …… Slit

Claims (1)

[Scope of utility model registration request] 1. An electronic device having a built-in speaker and a key button for operation, for a speaker (3) provided with a slit (51) for voice passage and a slit (52) for projecting the key button (21). It has a front grille (5), a plurality of keyboard units (2a to 2n) in which key buttons (21) are arranged, and a slit (62) for voice passage, and a contact circuit is connected by operating the key buttons (21). The front grill / keyboard for the speaker (3), which is formed by superimposing the printed circuit board (6) so as to form a switch circuit and is integrated by the pressing plate (7), is arranged in front of the speaker (3). Characteristic electronic equipment.