JPH05153682A - Acoustic apparatus - Google Patents

Abstract

PURPOSE:To improve an acoustic characteristic by eliminating the influence of a sound being generated at the rear of a loudspeaker and coming out to the front part of a cabinet. CONSTITUTION:The acoustic apparatus 1 is constituted by arranging a circuit board 14, a loudspeaker 10, etc., in a cabinet 2, and on the inside surface of a front part 3a of the cabinet, a rib 23 for roughly surrounding an area in which has an insert-through hole 6 for inserting through an operating button 7, etc., in the front part is formed. Also, the rib 23 is allowed to abut on the front of a rubber pad 21 superposed and arranged on the front of the circuit board with a rubber key 22 formed integrally. Since the part having an opening 6 of the front part of the cabinet is closed up tightly against the rear part of the loudspeaker, it can be prevented that a sound emitted from the rear of the loudspeaker is emitted to the front from the opening 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel acoustic device. More specifically, it is intended to provide a novel acoustic device that has good acoustic characteristics by eliminating the influence of the sound coming out from the front part of the cabinet that wraps around from the rear of the speaker.

[0002]

2. Description of the Related Art In conventional audio equipment such as radio receivers, no attempt has been made to suppress the sound coming from behind the speaker.

[0003]

Therefore, in the conventional audio equipment, there is a hole formed in the front surface of the cabinet for the sound sneaking in between the front surface of the cabinet and the circuit board from the rear of the speaker. For example, there is a problem in that it comes out forward through a hole provided for inserting an operation button or the like.

The sound that wraps around from the rear of the speaker cancels the original sound because it has the opposite phase to the original sound that travels forward, and especially the sound in the low-pitched range is considerably large. There is a problem that the sound quality is degraded due to cancellation.

[0005]

In order to solve the above-mentioned problems, the acoustic device of the present invention has an insertion hole formed in the inner surface of the front surface of the cabinet for inserting an operation button in the front surface. A rib that substantially surrounds the formed region is formed, and the rib is brought into contact with the front surface of the circuit board.

[0006]

Therefore, in the audio device of the present invention, the sound sneaking in from the rear of the speaker hardly exits to the front of the cabinet, and the original sound is canceled by the sound in the opposite phase to that of the sound quality. It almost never decreases.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of the audio equipment of the present invention will be described below with reference to the embodiments shown in the accompanying drawings. In the illustrated embodiment, the present invention is applied to the radio receiver 1.

Reference numeral 2 denotes a cabinet, and a front cabinet 3 and a rear cabinet 4 are butted against each other from the front and the rear, and are joined together to form a cabinet 2 having a rectangular shape which is thin and has a horizontal shape when viewed from the front.

A relatively large opening 5 in the shape of a horizontally long rectangle is formed in the center of the front surface 3a of the front cabinet 3, and a large number of small openings 6, 6, ... Are formed. 6, ... Operation buttons 7, 7, ...
.. is movably supported in the depth direction.

Reference numeral 8 is a sound emission port that is long in the left-right direction and is formed so as to contact the upper side of the large opening 5.

Reference numeral 9 denotes a chassis arranged in the cabinet 2, which has a size to fit exactly in the cabinet 2.

Reference numeral 10 denotes a speaker, which is arranged and fixed at a substantially central portion on the front surface of the chassis 9 and has a slightly upward posture.

Reference numeral 11 denotes a rib integrally formed on the front surface of the chassis 9, which is located so as to surround the speaker 10 and extends above the speaker 10 to the upper end, and its front end is at the front side of the front end of the speaker 10. And is formed to be substantially parallel to the front surface of the front cabinet 3.
The upper end 11a of the rib 11 projects further toward the front side than the remaining portion.

Reference numeral 12 is a rubber packing attached to the front end of the rib 11 except the upper end.

Denoted by 13 are locking claw pieces integrally projecting from the upper and lower edges of the chassis 9 toward the front, and the front end portions of the engaging claw pieces are opposed to each other at the upper and lower sides, that is, ,
Locking claws 13a, 13a, ... Are integrated at the front end of the lower surface of the locking claw pieces 13, 13 located on the upper side and at the front end of the upper surface of the locking claw pieces 13, 13, 13 positioned on the lower side. Is formed in.

Reference numeral 14 is a circuit board arranged in the cabinet 2. A notch 15 that is long in the left-right direction is formed on the upper edge of the circuit board 14. Then, a desired circuit is formed on the circuit board 14 and various electronic components are mounted.

Reference numeral 16 denotes a liquid crystal display panel, which is a circuit board 1.
It is fixed to a position on the front surface of No. 4 which contacts the notch 15 from below.

A metal shield plate 17 is fixed to the rear surface of the circuit board 14 at a position corresponding to the liquid crystal display panel 16.

.. are engaging notches formed on both upper and lower edges of the circuit board 14. Two engaging notches are provided at the upper edge of the circuit board 14 with a large notch 15 interposed therebetween, and at the lower edge are the center and left and right sides. Three pieces are formed at positions near both ends, and a total of five pieces are formed.

The switch contacts 19 are formed on the front surface of the circuit board 14.

The circuit board 14 as described above is supported on the front side of the chassis 9. That is, the engaging notches 18, 18, ... Of the circuit board 14 and the locking claw pieces 13, 1 of the chassis 9
.. and the circuit board 14 is pushed toward the chassis 9, the locking claw pieces 13, 13, ... Bend outward and the locking claws 13a, 13a ,. Engage with the front edges of the engagement notches 18, 18, ..., By which the circuit board 14 is supported on the front side of the chassis 9.

By thus connecting the circuit board 14 and the chassis 9 to each other, the speaker 10 and the shield plate 17 on the back surface of the circuit board 14 face each other, and
The rib 11 of the chassis 9 contacts the back surface of the circuit board 14 via the packing 12, and the notch 1 of the circuit board 14 is formed at the upper end.
A space 20 having an opening 5 is formed. The speaker 10
Since, as described above, the speaker 10 and the shield plate 17 of the circuit board 14 are arranged slightly upward, the gap between the speaker 10 and the shield plate 17 of the circuit board 14 is formed so as to increase upward.

Reference numeral 21 denotes a rubber pad, which is formed in a shape and a size that substantially covers the front surface of the circuit board 14 except the part to which the liquid crystal display panel 16 is attached.

The rubber pad 21 has a large number of keys 22, 2
2, ... Are integrally formed. Key 22 is main part 2
2a and a deforming portion 22b integrally formed in a skirt shape from the periphery of the main portion 22a and integrally connected to the rubber pad 21, and a conductive material such as carbon is applied to the rear surface of the main portion 22a to form a short-circuit portion. 22c is formed.

The rubber pad 21 is used for the circuit board 14
The liquid crystal display panel 16 is covered by the front surface of the portion other than the attached portion. As a result, each key 22, 22, ...
The short-circuited portions 22c, 22c, ... Of are opposed to the contact portions 19, 19 ,. Therefore, when the main portion 22a of the key 22 is pressed from the front side, the deformable portion 2
2b is deformed, the main portion 22a moves rearward, the short-circuit portion 22c comes into contact with the contact portion 19, and the contact portion 19 is short-circuited to output a required signal. It should be noted that, except for the force pressing the main portion 22a, the main portion 22a returns to the original position by the elastic force accumulated by the deformation of the deforming portion 22b.

A chassis 9 assembled as above,
The circuit board 14 and the rubber pad 21 are arranged in the cabinet 2.

Then, the notch 15 of the circuit board 14 faces the sound output port 8 of the front cabinet 3, whereby the space 20 is opened forward at the sound output port 8 of the front cabinet 3.

The liquid crystal display panel 16 is exposed to the outside through the opening 5 of the front cabinet 3.

Further, the operation buttons 7, 7, ... Supported on the front cabinet 3 are the keys 2 of the rubber pad 21.
2, 22, ... Therefore, when the operation button 22 is pressed from the front side, the key 20 corresponding to the operation button 22 is pressed and the contact portion 19 corresponding to the key 22 is closed.

Reference numeral 23 is a rib integrally formed on the rear surface of the front surface portion 3a of the front cabinet 3, and is a rubber pad 21.
It is formed so as to correspond to the portion along the lower edge of the rubber pad 21, the portion along both left and right edges of the rubber pad 21, the portion along the upper edge of the rubber pad 21, and the portion along the upper ends of the left and right inner edges of the rubber pad 21.

Therefore, when the chassis 9, the circuit board 14 and the rubber pad 21 are arranged in the cabinet 2, the ribs 23 of the front cabinet 3 are pressed against the portions of the rubber pad 21 along the above-mentioned edges, whereby the front cabinet 3 is pressed.
The openings 6, 6, ... Formed in the cabinet 2 are sealed from portions other than the portion between the rubber pad 21 surrounded by the ribs 23 in the cabinet 2 and the front cabinet 3.

In the radio receiver 1 described above, the sound of the speaker 10 is first reflected by the back surface of the circuit board 14, specifically, the shield plate 17, and then the front surface of the chassis 9 and the circuit board 14. After repeating reflection with the rear surface, the sound is emitted forward from the sound emitting port 8 on the front surface.

Then, the sound emitted to the rear of the speaker 10 is
Although trying to go forward through the space inside the cabinet 2, the cabinet 2 is substantially sealed, and the front portion 3
The portion in which the openings 5, 6, 6, ... Of a are formed is sealed from the other portions in the cabinet 2 by the ribs 23 coming into contact with the rubber pad 21, and therefore is rotated from the rear of the speaker 10. The injected sound does not escape to the front through the gap between the openings 6, 6, ... And the operation buttons 7, 7 ,.

Therefore, the original sound emitted from the sound emitting hole 8 is not canceled by the sound emitted from the back side of the speaker 10 having the opposite phase, and high sound quality can be maintained.

[0035]

As is apparent from the above description, the audio equipment of the present invention is an audio equipment in which a circuit board, a speaker and the like are arranged in a cabinet, and the front surface is provided on the inner surface of the front portion of the cabinet. A rib is formed so as to substantially surround a region of the portion where an insertion hole for inserting an operation button is formed, and the rib is brought into contact with the front surface of the circuit board.

Therefore, in the audio device of the present invention, the sound sneaking in from the rear of the speaker hardly exits to the front of the cabinet, and the original sound is canceled by the sound in the opposite phase to that of the sound quality. It almost never decreases.

Although the above embodiment shows the present invention applied to a radio receiver, it does not mean that the scope of application of the present invention is limited to such a thing, and it can be applied to a wide range of other acoustic sounds. It can be applied to equipment.

In the above embodiment, the rib formed on the front surface of the cabinet is in contact with the circuit board through the rubber pad. However, by doing so, the sealing effect is considerably improved. It goes without saying that the ribs may be brought into direct contact with the front surface of the circuit board.

It should be noted that the specific shapes and structures shown in the above embodiments are merely examples for embodying the present invention, and the technical scope of the present invention is limitedly interpreted by these. It is not something that will be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a radio receiver to which the present invention has been applied.

FIG. 2 is a front view of a radio receiver.

3 is an enlarged cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a front view showing a state in which a front cabinet is removed.

5 is an enlarged cross-sectional view taken along the line VV of FIG.

FIG. 6 is a front view showing the chassis with a speaker attached.

7 is an enlarged cross-sectional view taken along the line VII-VII of FIG.

FIG. 8 is a rear view of the front cabinet.

FIG. 9 is a front view showing a state where a rubber pad is removed from FIG.

[Explanation of symbols]

 1 Audio Equipment 2 Cabinet 6 Insertion Hole (Insert Operation Button) 7 Operation Button 10 Speaker 14 Circuit Board 19 Switch Contact 21 Rubber Pad 22 Rubber Key 23 Rib

Claims (2)

[Claims] 1. An audio device in which a circuit board, a speaker and the like are arranged in a cabinet, and an insertion hole for inserting an operation button in the front part is formed in an inner surface of the front part of the cabinet. A rib that substantially surrounds the
An acoustic device characterized in that the rib is brought into contact with a front surface of a circuit board. 2. A contact portion of a switch is formed on the front surface of a circuit board, and a rubber pad integrally formed with a rubber key for turning on and off the contact portion is arranged on the front surface of the circuit board so as to be formed on the front portion of the cabinet. The acoustic device according to claim 1, wherein the ribs are configured to contact the front surface of the circuit board via the rubber pads.