JPH0648299U - Surface mount sound generator - Google Patents

Abstract

(57) [Summary] [Purpose] Enables surface mounting of a sounding body. [Structure] A leg 9 is provided on one surface of a casing 2 of a sounding body 1 having a solder connection terminal 5. Leg 9 is casing 2
Has a rising height to support the solder connection terminal 5 on the mounting surface, and the legs 9 are supported on the wiring board 10 to support the casing 2. To stabilize.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a surface-mounted sounding body that is surface-mounted as one of electric components on a wiring board.

[0002]

[Prior art]

 In surface mounting, cream solder is applied to the component connection positions on the wiring board, then electronic components such as resistors, capacitors, and semiconductor elements are mounted at each position, and the cream solder is heated and melted to electrically connect the components to each wiring. As shown in FIG. 3, the surface mounting component usually has solder connection terminals 12 on the bottom and side faces of the component 11. The component 11 having the solder connection terminal 12 on the side surface is provided on the same plane as the bottom surface of the component, and the component 11 having the solder connection terminal 12 on the bottom surface has a step on the bottom surface of the component 11 by the thickness of the terminal. Will be done.

The sounding body is an electric component having a built-in vibrator, and is roughly classified into a piezoelectric type and an electromagnetic type. However, both sounding units are more functional than the resistors and capacitors because of functional restrictions. Inevitably becomes large. Conventionally, it has been customary to attach a sounding body to a wiring board only by inserting a terminal into a hole opened in a wiring board for solder connection, and there has been almost no case where surface mounting is performed.

[0004]

[Problems to be solved by the device]

 The sounding body usually has a cylindrical casing, and when the solder connecting terminal 5 is provided on the bottom surface of the casing 2 as shown in FIG. Since a step of about 2 mm is formed, when this terminal 5 is mounted on the wiring board 10 and soldered, the stability of support cannot be obtained as shown in FIG. Particularly, in the surface mounting, since the terminals 5 are connected to the cream solder put on the wiring board 10, the entire bottom surface of the casing 2 does not always sit on the board in a stable manner. There is no guarantee that the surface mounting will be stable even if 5 is extended to the side of the casing 2 and the bottom surface and the terminal surface are flush with each other. When the sounding body 1 is not stably supported on the substrate 10, the sound pressure generated is unstable.

An object of the present invention is to provide a surface mount sounding body that can be stably mounted on a wiring board.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the surface-mounting speaker according to the present invention is a surface-mounting speaker that has a solder connecting terminal and legs in a casing and has a built-in vibrator. , Which connects the oscillator to an external circuit, is provided in pairs on one side of the casing, and the legs have a rising height that supports the casing at a fixed height position on the mounting surface. It is formed on the same surface as the connection terminals, and the rising height of the legs is set within the range of the rising height of the cream solder placed on the wiring on the mounting surface.

[0007]

[Action]

 When the legs of the casing are installed on the wiring board, a gap is formed between the substrate and the casing by the rising height of the legs, and the solder connection terminals are located in this gap. The distance between the wiring board and the solder connection terminal is suitably set in the range of 0.05 to 0.15 mm. The cream solder placed on the wiring board is attached to the solder connection terminals and solidified and fixed, and the casing is supported by the legs and stably mounted on the wiring board.

[0008]

【Example】

 An example in which the present invention is applied to a piezoelectric speaker will be described below with reference to the drawings. In FIG. 1, a sounding body 1 has a casing 2 in which a piezoelectric vibrator 3 is housed, and a pair of solder connection terminals 5 provided on a contact 4 is provided on the bottom surface of the casing 2. The casing 2 is a combination of a tubular body 6 and a bottom plate 7, the piezoelectric vibrator 3 has a peripheral edge portion supported by an annular edge 6a of the tubular body 6, and the pair of contacts 4 is a vibration plate of the piezoelectric vibrator 3. 3a and a piezoelectric element 3b provided on the lower surface of the vibrating plate 3a are brought into contact with each other and supported by the bottom plate 7, and their terminals are folded and fixed to the lower surface of the bottom plate 7. The terminal of the contactor is the solder connection terminal 5. A sound emitting hole 8 for sounding is opened on the upper surface of the cylindrical body 6.

In the present invention, legs 9 are provided so as to protrude from the peripheral portion of a bottom plate 7 forming the bottom surface of the casing 2 provided with the solder connection terminals 5. The legs 9 support the casing 2 in a stable manner, and the number and size of the legs 9 are not limited, but the legs 9 are divided into two or more, and further dispersed on the peripheral portion of the bottom plate 7 as shown in FIG. It is preferably formed integrally.

The rising height of the leg 9 is naturally limited in relation to the height of the cream solder applied on the wiring board 10. Since the solder connection terminal 5 is a thin plate of about 0.2 mm and is provided so as to overlap the bottom surface of the bottom plate 7 of the casing 2, the solder connection terminal 5 is provided between the bottom of the casing 2 and the solder connection terminal 5. Has a step of about 0.2 mm. On the other hand, the height of the cream solder placed on the wiring of the wiring board 10 is about 0. Since it is about 25 to 0.3 mm, the rising height of the leg 9 is set so that the distance between the mounting surface and the solder connection terminal 5 is 0.05 to 0.15 mm.

In the embodiment, the sounding body 1 is mounted at a predetermined position on the wiring of the wiring board 10, the solder connection terminal 5 is positioned on the cream solder arranged on the wiring, and the cream solder is heated by the heat treatment. The terminal 5 is melted and dipped, and the solder is solidified to complete the mounting. The procedure is exactly the same as the procedure for surface mounting general electrical components. According to the present invention, in the sounding body 1, the terminals 5 are solder-connected to the wiring on the substrate 10, and the casing 2 is supported on the legs 9 and stably fixed on the substrate 10.

In the above, the example applied to the piezoelectric type sounding body has been described, but the same can be applied to other sounding type such as electromagnetic type.

[0013]

[Effect of device]

 As described above, according to the present proposal, the sounding body is supported by the legs and stably fixed on the wiring board, and the solder connection terminals are within the rising height range of the cream solder arranged on the wiring. Since it is supported on the solder connection terminal, it can be embedded in the swell of the molten solder during mounting, and after solidification of the solder, it can be surely contacted and electrically connected to the wiring. Since the sounding body can be stably fixed on the board without applying pressure, the sound pressure during sounding can be stably maintained and the surface mounting of the sounding body can be realized.

[Brief description of drawings]

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

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a diagram showing an example of surface mount components.

FIG. 4 is a diagram showing a problem when a sounding body is surface-mounted.

[Explanation of symbols]

 1 Sounding body 2 Casing 3 Piezoelectric vibrator 4 Contact 5 Solder connection terminal 6 Cylindrical body 7 Bottom plate 8 Sound emission hole 9 Leg 10 Wiring board

Claims (1)

[Scope of utility model registration request] 1. A surface mount sounding body having a solder connecting terminal and legs in a casing, and a vibrator incorporated therein, the solder connecting terminal connecting the vibrator to an external circuit. , The pair of legs are provided on one surface of the casing, and the legs have a rising height that supports the casing at a certain height position on the mounting surface and are formed on the same surface as the solder connection terminals. The surface-mounted sound-producing body is characterized in that the solder connection terminals are set within the rising height range of the cream solder placed on the wiring of the mounting surface.