JPH0711084U - Small speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To complete the waterproof structure of small speakers used outdoors. [Structure] The speaker main body 1 in which a front surface of a diaphragm is covered with a plastic film is provided with front and rear small holes 5 and 6 for passing sound waves.
In a small speaker housed in a box 4 provided with
A thin waterproof film 10 is stretched over the rear part of the speaker body 1 in the box 4. The waterproof film 10 enables complete waterproofing without affecting the characteristics.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small speaker that is used outdoors.

[0002]

[Prior art]

 If the speaker is to be used outdoors, it must be waterproof to prevent rain. The small speaker shown in FIG. 2 is a conventional speaker manufactured for this purpose. To explain this, 1 is a speaker main body, which activates an electromagnetic circuit provided inside the housing 3 by a voice current given by a cord 2 to vibrate the diaphragm. A small hole 5 for passing sound waves is provided on the front surface of a box 4 that houses the speaker body 1, and a small hole 6 for adjusting the atmospheric pressure is provided on the rear surface. The front surface of the diaphragm of the speaker body 1 is covered with a plastic film (not shown) so as to cover the front portion of the speaker body 1.

Inside the box 4, the rear air chamber 7 formed at the back of the speaker body 1 is completely sealed, which means that the air inside expands and contracts due to changes in atmospheric pressure and temperature. The small hole 6 is provided in order to eliminate the problem. However, since it is uncomfortable for water to enter through the small holes 6, a seal plate 8 that allows air but does not allow water to pass through is attached to the inner surface of the small holes 6.

[0004]

[Problems to be solved by the device]

 As described above, in the conventional structure, it is necessary to attach the seal plate 8 through which the air passes but the water does not pass, to the inner surface of the small hole 6, so that there is a problem that the cost increases. The present invention has been made in view of this point, and an object of the present invention is to provide a small-sized speaker that can easily and reliably obtain a waterproof effect.

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides a small speaker in which a speaker body in which a front surface of a diaphragm is covered with a plastic film is housed in a box having small holes for passing sound waves on front and rear surfaces. A thin waterproof film is stretched over the rear part of the speaker main body in the box.

[0006]

[Action]

 With this configuration, the back of the speaker body is covered with a waterproof film, but since this waterproof film is thin, it vibrates according to the vibration of the diaphragm.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and the same members as those in FIG. Also in the present invention, the speaker body 1 is covered with a plastic film (not shown) on the front surface, and this is housed in a box 4 having small holes 6 for transmitting sound waves on the front and rear surfaces. A thin waterproof film 10 is stretched inside the ring-shaped packing material 9 for mounting the speaker body 1 at the rear part of the speaker body 1 in the box 4. Reference numeral 11 is a silicone rubber that holds the cord 2.

This small-sized speaker configured as described above absorbs a change in atmospheric pressure generated at the back of the speaker body 1 by expansion and contraction of the waterproof film 10 when the vibration plate is vibrated by receiving a voice current from the cord 2. Will be done. Therefore, the function as a speaker can be obtained in the same manner as the conventional one, and the characteristics are not affected. Even if water enters the inside of the box 4 through the small hole 6 at the rear of the box 4, the water is blocked by the waterproof curtain 10, so that the speaker body 1 will not get wet.

[0009]

[Effect of device]

 Since the present invention is a small-sized speaker configured as described above, it is possible to ensure waterproofing with a very simple structure. Since it is not necessary to attach a seal plate to the small hole at the rear part of the housing, unlike the conventional one, cost reduction can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional small speaker.

[Explanation of symbols]

 1 Speaker Main Body 3 Housing 4 Box 5 Small Hole 6 Small Hole 7 Rear Air Chamber 10 Waterproof Screen

Claims (1)

[Scope of utility model registration request] 1. A small speaker in which a speaker main body having a front surface of a diaphragm covered with a plastic film is housed in a box having small holes for passing sound waves in front and rear surfaces, and a thin waterproof film is provided at a rear portion of the speaker main body in the box. A small speaker with a stretched membrane.