JPH0617416Y2 - Portable audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a portable audio device in which a device case also serves as a box for a built-in speaker.

(Prior Art) Conventionally, as a device of this type, there is a device in which a speaker is incorporated in a device case and acoustic adjustment of low-pitched sound is electrically performed by a built-in tone control circuit.

(Problems to be solved by the invention) However, in acoustic adjustment by means of electric circuits, there is a limit in performance due to the constraint condition of a small audio device case, and a good acoustic effect is achieved especially in the bass range. The drawback was that it was often insufficient to obtain.

Therefore, the present invention was made in order to solve the above-mentioned problems of the prior art, and is a portable audio device capable of adjusting the sound quality in the low frequency range without deterioration of the sound quality by a simple mechanical acoustic means. Is intended to provide.

(Means for Solving Problems) Next, the configuration of the present invention will be described. As shown in FIGS. 1 and 2, in a portable audio device, a device case incorporating a speaker also serves as the speaker box.
It has a pull-down push-down stowable carrying handle on its top plate.

A through hole is formed in the top plate at a position facing the handle, and the through hole penetrates through the equipment case.The through hole is closed by the carrying handle when the carrying handle is pushed down and opened when the carrying handle is pulled up. Has been done.

(Operation) With such a configuration, when the carrying handle is pushed down, the through hole of the top plate is closed, and when pulled out, the through hole is opened.

In the closed state, the device case operates almost as a sealed enclosure with respect to the built-in speaker. Therefore, the frequency characteristic in the low frequency range is cut, the clarity is improved, and the sound quality adjustment suitable for speech is performed.

In the open state, the device case acts as a bass reflex type enclosure for the built-in speaker. As a result, the bass frequency characteristics are raised, and a sound quality adjustment state suitable for music is obtained.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the box-shaped device case 10, a speaker 12 is attached to the inside of a front plate 11, and a carrying handle 14 is slidably pulled out and attached to a substantially central portion of an upper plate 13.

The carrying handle 14 comprises a slide shaft 15 at both ends and a handle 16 connecting these slide shafts. A trough-shaped recess 17 having a size for accommodating the handle 16 is formed in the upper surface plate 13, and a plurality of through holes 18 penetrating the inner and outer spaces of the device case 10 are arranged at equal intervals on the bottom surface of the recess 17. ing. When pulling out the stored handle 16,
A recess 19 for hooking a finger of the hand is formed adjacent to the recess 17.

An annular projection 20 is provided around the through hole 18. The outer circumference of the handle 16 is covered with a rubber elastic sleeve 21 that also serves as a slip stopper.

When the carrying handle 14 is pushed down and the handle 16 is housed in the recess 17, the protrusion 20 and the sleeve 21 contact each other, whereby the through hole 18 is completely closed.

When the speaker's speech signal is amplified from the speaker 12, increasing the intelligibility is an important factor. At this time, if the through hole 18 is closed, the device case 10 operates as a closed cabinet with respect to the speaker 12, and the low sound is suppressed.

On the other hand, when outputting a music signal from the speaker 12, a sound quality that is full of music is required rather than intelligibility.

In this case, if the carrying handle 14 is pulled up and the through hole 18 is opened, the device case 10 operates as a bass reflex type cabinet with respect to the speaker 12 and is radiated from the rear surface of the diaphragm of the speaker 12. A part of the sound is radiated through the through hole 18 in substantially the same phase as the sound from the front surface of the speaker 12, and the bass is sufficiently amplified and output.

(Effect of the Invention) As described above, according to the present invention, it is possible to easily and easily adjust the low range sound quality of the portable audio device by the vertical sliding operation of the handle. The built-in speaker can be used as a closed type or a bass reflex type cabinet, so that it has practically excellent effects.

[Brief description of drawings]

FIG. 1 is an external perspective view of a portable audio device embodying the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 10 ... Equipment case, 12 ... Speaker, 13 ... Top plate, 1
4 ... Handle, 16 ... Handle, 17 ... Recess, 18 ... Through hole, 20 ... Projection, 21 ... Sleeve.

Claims (1)

[Scope of utility model registration request] 1. A device case has a speaker built therein, which also serves as the speaker box, and has a pull-out type carrying handle on its top plate, and the device case is inside and outside at a position of the top plate facing the handle. A portable acoustic device having a through hole penetrating to the inside thereof, and the through hole being closed by the handle when the handle is pushed down.