JPH0845747A - Fixed structure for small transformers in electronic equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fixing structure for a small transformer in an electronic device that can be mounted and fixed with a small number of parts without screwing the small transformer to the base portion. [Structure] A small transformer 4 is laterally arranged on a base portion 1, and a U-shaped frame-shaped transformer holding portion 21 for holding and fixing a coil portion 4b of the small transformer 4 is provided on the base portion 1, while a small transformer is provided. 4, a notch 4c is formed on the transformer printed circuit board 4a fixed to the bottom surface of the transformer 4, and a pressing protrusion 2h fitted into the notch 4c is provided on the cover 2 to project the transformer retainer 21 and the pressing protrusion 2h. Thus, the small transformer 4 is fixed to the base portion 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing structure for mounting a small transformer incorporated in an electronic device such as a security hands-free intercom or a portable communication device on a base portion of the electronic device by a simple method.

[0002]

2. Description of the Related Art Conventionally, when a small transformer is built in and fixed in an electronic device such as a security hands-free intercom or a portable communication device, a recess for disposing the small transformer is provided in a base part and a cover part of the electronic device. The small transformer is fitted in these recesses, and the base portion and the cover portion are fitted to each other, whereby the small transformer is pressed and fixed by the base portion and the cover portion. However, in this way, with the structure in which the small transformer is pressed and fixed by the base portion and the cover portion of the electronic device, a large impact force is applied to the cover portion when it is pressed or when some impact is applied, There was a problem such as the cover breaking. In addition, the structure of a small transformer, which has been well known in the past, is fixed with screws by covering it with a mounting bracket, which requires a large number of parts and requires screwing work, which makes assembly difficult and costly. There was a problem of becoming.

[0003]

SUMMARY OF THE INVENTION According to the present invention, it is possible to prevent the cover from cracking due to an impact, to easily fix a small transformer to the base without screwing, to reduce the number of parts, and to reduce the cost. The object is to provide a fixing structure for a small transformer in a device.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above object, and a fixing structure for a small transformer in an electronic apparatus according to claim 1 is such that the small transformer is laterally arranged on a base portion. A U-shaped frame-shaped transformer holding portion for holding and fixing the coil portion of this small transformer is provided on the base portion, while a cutout portion is formed on the transformer printed circuit board fixed to the bottom surface of the small transformer. In addition, a pressing projecting piece that is fitted into the cutout part is provided on the cover part so that the small transformer is fixed to the base part by the transformer pressing part and the pressing projecting piece.

According to a second aspect of the present invention, there is provided a fixing structure for a small transformer in an electronic device, wherein a concave portion is formed at an upper side portion of the transformer holding portion for fixing the coil portion of the small transformer by applying elastic force. Is.

According to a third aspect of the present invention, there is provided a fixing structure for a small transformer in an electronic apparatus, wherein the small transformer, the base section having the transformer pressing section, and the cover section having the pressing projection are arranged in a small portable communication apparatus. It was done.

[0007]

According to the fixing structure of the small transformer in the electronic equipment of claim 1, after the small transformer is laid sideways, the coil portion of the small transformer is fitted into the U-shaped frame-shaped transformer holding portion of the base portion, and then, Since the pressing protrusion protruding from the cover portion is fitted and fixed in the cutout portion of the transformer printed circuit board fixed to the bottom surface of the small transformer, the small transformer can be firmly fixed to the base portion.

According to the fixing structure of the small transformer in the electronic device of the second aspect, since the concave portion is provided on the upper side of the transformer holding portion, the elastic force of the concave portion is applied to the coil portion of the small transformer in the pressing direction. Act towards. Therefore, the small transformer is firmly fixed to the base portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a fixing structure for a small transformer in an electronic device according to the present invention will be described below with reference to the drawings (see FIGS. 1 to 6). In this embodiment, the one applied to the security hands-free intercom will be described, but the present invention is not limited to this and can be applied to other electronic devices such as portable communication devices. First, the overall structure of the security hands-free intercom SI will be described with reference to FIG.

The security hands-free intercom SI includes a base portion 1, a cover portion 2 which is fixedly engaged with the base portion 1, and the base portion 1 and the cover portion 2.
And a printed circuit board 3 arranged inside. The printed circuit board 3 has a small-sized horizontal transformer 4 having a transformer printed circuit board 4a attached and fixed to the bottom surface thereof.
A call speaker 5 and a call microphone 6 are attached.

In addition to the above, the printed circuit board 3 also includes, as indicators, an emergency button indicator lamp 7 including an LED, an emergency indicator lamp 8, a gas indicator lamp 9, a current indicator lamp 10, and a call indicator. A lamp 11 and the like are attached, and as the switches, an emergency switch 12, an alarm stop switch 13, a call switch 14, a gas non-connection detection switch 15, an intercom ring volume switching switch 16 and the like are attached. A gas non-connection operation section 17 is provided on the front side of the gas non-connection detection switch 15, and a door phone ringing volume operation section 18 is provided on the front side of the doorphone ringing volume changeover switch 16.

Between the base portion 1 and the printed circuit board 3,
A connection terminal plate 19 such as a plurality of intercoms is provided and attached with a plurality of terminal screws 20. In the base part 1,
A U-shaped frame-shaped transformer holding portion 21 for fixing the coil portion 4b of the small transformer 4 is provided upright.

A decorative plate 23 is fitted into a concave portion 2a formed on the upper surface of the cover portion 2, and a spring 24 is provided in a circular concave portion 2b formed in the concave portion 2a and a circular hole 23a of the decorative plate 23. The internally installed emergency push button 25 is fitted. The recess 2b is formed at a position corresponding to the emergency button indicator light 7 and the emergency switch 12 attached to the printed circuit board 3. In addition, the cover portion 2 and the decorative plate 23
Has through holes 2c and 23c formed at positions corresponding to the alarm stop switch 13 attached to the printed circuit board 3, and the alarm stop push button 2 is provided in these through holes 2c and 23c.
6 is fitted.

Further, the decorative board 23 includes the printed circuit board 3
Which are attached to the emergency indicator lamp 8, the gas indicator lamp 9, and the energizing indicator lamp 10 are respectively attached to the emergency indicator section 2
7, a gas display unit 28, and an energization display unit 29 are provided, and the cover unit 2 includes the emergency display unit 27, the gas display unit 28,
The hole 2 for transmitting light of the emergency indicator lamp 8, the gas indicator lamp 9, and the electricity indicator lamp 10 is provided at a position corresponding to the electricity indicator portion 29.
j are formed respectively. In addition, the cover part 2 includes
A recess 2d into which the call operation plate 30 is fitted is formed, and the locking claw 30 provided on the call operation plate 30 is formed in the recess 2d.
A locking hole 2e for inserting a and a pair of holes 2f for fitting a pair of mounting projections 30b provided on the telephone operating plate 30 are formed. Reference numeral 30c is a protrusion for pressing the call switch 14. Furthermore, a pair of left and right fitting claws 2g (only one of which is shown) are provided on the lower edge of the cover 2 so as to be attached and fixed to the base 1.

FIG. 7 is a front view of the security hands-free intercom SI to which the mounting structure of this embodiment is applied. The security hands-free intercom SI is provided with an internal emergency An emergency push button 25 through which light from the lighting of the button indicator light 7 is transmitted to the surface portion, an emergency display portion 27, and a gas display portion 28.
An energization display unit 29 and an alarm stop push button 31 for operating the alarm stop switch 13 are provided in an exposed state. On the lower side, a call operation plate 30 and this call operation plate 3 are provided.
A call display portion 32 that transmits the lighting light of the call indicator lamp 11 is disposed in a part of 0 in an exposed state, and is provided in a substantially central portion in the longitudinal direction.
A plurality of speaker through holes 33 are formed.

FIG. 8 is a bottom view of the security hands-free intercom SI, and a gas non-connecting operation section 17 and a doorphone ringing volume operation section 18 are provided on the bottom surface thereof. In both cases, the operation units 17 and 18 are of a slide type. FIG. 9 shows a system configuration of the security hands-free intercom SI. The security hands-free intercom SI includes a doorphone 34 arranged at the entrance, a gas sensor 35 arranged at the ceiling, and an interior room. The external emergency push button 36 and the additional speaker 37, which are arranged in the, are connected via wirings L1, L2, L3, and L4, respectively. The security hands-free intercom SI and the gas sensor 35 have a power supply of AC100V ( (Not shown) is supplied.

Next, the fixing structure of the small transformer of this embodiment will be described with reference to FIGS. In this small transformer fixing structure, the small transformer 4 is laterally arranged on the base portion 1, and the U-shaped frame-shaped transformer holding portion 21 for holding and fixing the coil portion 4b of the small transformer 4 is provided at the base. It is formed at the end of the part 1. A cutout portion 4c is formed on the transformer printed circuit board 4a fixed to the back surface of the small transformer 4 (see FIG. 3), and the cutout portion 4c is formed on the outer surface of the recess 2d of the cover portion 2. The transformer 4 is fixed by fitting a pair of pressing projection pieces 2h formed therein.

On the other hand, on the upper side of the transformer holding portion 21, there is formed a concave portion 21a for fixing the small transformer by applying elastic force, and in the base portion 1, the small transformer 4 is housed. The recess 1a is formed on the end side, and the open portion 3a for inserting the small transformer 4 is formed at the end of the printed circuit board 3 (see FIG. 1). Next, a procedure for fixing the small transformer by the fixing structure of the small transformer will be described. First, the small transformer 4 is placed sideways in the recess 1a of the base portion 1, and the open portion 3a of the printed circuit board 3 is fitted into the small transformer 4. At this time, the U-shaped transformer holding portion 21 of the base portion 1
Then, the coil portion 4b of the small transformer 4 is fitted and fixed (see FIGS. 4, 5 and 6). Next, when the cover portion 2 is fixed to the base portion 1, a pair of pressing projection pieces 2h on the outer surface of the recess 2b of the cover portion 2 are projected from the cutout portion 4c of the printed circuit board 4a (see FIG. 2). , FIG. 4), the small transformer 4 is firmly fixed to the base portion 1 by the transformer pressing portion 21 and the pair of pressing projection pieces 2h.

In this way, the transformer pressing portion 21
The elastic force of the concave portion 21a formed on the upper side portion acts on the coil portion 4b of the small transformer 4 in the pressing direction,
The small transformer 4 is firmly fixed to the base 1 (see FIG. 5). In the present invention, the base 1
In addition, the small transformer 4 can be easily fixed, and the cover 2 can be prevented from cracking due to impact. Moreover, since the small transformer 4 can be fixed to the base portion 1 without being screwed, the mounting work is easy and the number of parts can be reduced, so that the cost can be reduced.

Next, the concealment structure of the gas non-connection detection switch 15 arranged at the bottom of the security hands-free intercom SI will be described with reference to FIGS. 10 to 16. Here, when the gas sensor 35 (see FIG. 9) is not connected to the terminal, a notification sound is emitted, but when the gas sensor 35 is not connected to the terminal, the gas unconnection detection switch 15 is turned on. If set, the notification sound will not be activated. As described above, the gas non-connection detection switch 15 is provided to turn off or turn off the notification sound by turning it off or on.

FIGS. 10 to 12 show a first example of the concealing structure of the gas non-connection detection switch 15, which is the bottom 1A of the base portion 1 in the portion where the gas non-connection detection switch 15 is arranged. An opening 40 for continuous switch operation is formed on the bottom 2A of the cover 2, and the opening 40
The chip 50 is arranged so as to be vertically movable. As shown in FIG. 11, the tip 50 is provided with a pair of downward elastic locking pieces 51 on the left and right upper ends of the tip 50, and the lower ends of the elastic locking pieces 51 are outwardly engaged. Stop projections 51a are formed respectively. On the side wall of the opening 40 on the side of the base portion 1 is a gap 1 for moving the elastic locking piece 51 of the chip 50 up and down inward of the opening 40.
s is provided, and locking projections 1t that lock the locking projections 51a of the elastic locking pieces 51 respectively are formed on the inner surface of the side wall at substantially the center in the vertical direction.

With the above configuration, as shown in FIGS. 10 and 11, when the chip 50 is located on the upper end side of the opening 40 and the gas non-connection detection switch 15 is hidden, the elastic locking piece 51 is engaged. It is locked on the upper side of the stop projection 51a,
This concealed state is retained. Next, as shown in FIG. 12, when the tip 50 is moved downward, when the tip 50 is pushed downward, the elasticity of the elastic locking piece 51 causes the locking projection 51 a to move the locking projection 51 a to the side wall of the opening of the base part 1. The tip 50 moves over the locking projection 1t of (1) and moves downward.

In this downwardly-moved state, the locking projection 51a of the elastic locking piece 51 is locked to the lower edge of the opening side wall of the base 1, and this state is maintained. At this time, since the gas non-connection detection switch 15 can be seen in the inner part of the opening 40, the switch 15 is switched by the tip of the driver or the like. After this switching is completed, the chip 50 is moved upward to cover the gas non-connection detection switch 15 with the chip 50.

13 and 14 show a second example of the concealing structure of the gas non-connection detection switch 15, in which the locking small convex portion 52a is formed at the upper end portion, and the sizes of the upper, lower, left and right are openings. A tip 52, which is formed slightly smaller than the portion 40, is provided with a pivot 53 provided at the lower end of the tip 52 so that the opening 40
It is pivotally attached so that it can be opened and closed vertically. On the upper wall surface of the opening 40 on the cover portion 2 side, the locking small convex portion 5 of the upper end portion of the chip 52 is formed.
A small recess 40a into which 2a is inserted is formed. With the above configuration, normally, as shown in FIG.
Is closed, and at this time, the locking small convex portion 52a of the tip 52 is engaged with the small concave portion 40a of the upper wall surface of the opening 40 to maintain the closed state of the tip 52.

Next, as shown in FIG. 13, when the tip 52 is tilted forward, the locking small convex portion 52a and the small concave portion 40a are formed.
The engagement state with the is released, the chip 52 is opened, and the gas non-connection detection switch 15 can be seen in the inner part of the opening 40. In this state, the gas non-connection detection switch 15 is switched by the tip of a driver or the like, and then the tip 52 is closed as shown in FIG. 14, and the locking small convex portion 52a is engaged with the small concave portion 40a. The closed state of the tip 52 is maintained.

FIGS. 15 and 16 show a modification of the concealing structure of the gas non-connection detection switch 15, in which the gas non-connection detection switch 15 is directed to the lower side of the back surface of the printed circuit board 3 toward the rear side. It is mounted in a projecting state, and a peep opening 1u is formed in the base portion 1 at a position corresponding to the gas non-connection detection switch 15. Normally, the security hands-free intercom SI is attached to the wall surface with the back surface of the base part 1 facing the wall surface side, so this peep opening 1u is the security hands-free intercom S.
Since it is located on the back surface side of I and on the wall surface side, the gas non-connection detection switch 15 cannot be seen from the outside in this attached state.

When the gas non-connection detection switch 15 is switched, the security hands-free intercom SI is removed from the wall surface, then the security hands-free intercom SI is turned to the back, and the tip of the drumber is inserted into the peep opening 1u. Then, the gas non-connection detection switch 15 is switched. Then, after switching, the security hands-free intercom SI is attached again to the wall surface.

[0028]

As described above, according to the fixing structure of the small transformer in the electronic device of the first aspect, the small transformer is placed sideways, and the U-shaped frame-shaped transformer holding portion provided on the base is provided with: The coil part of this small transformer is fitted and fixed, and the notch of the printed circuit board for the transformer fixed to the bottom of the small transformer is fitted with the pressing protrusion of the cover part to project and the small transformer is fixed to the base part. Therefore, the small transformer can be easily fixed to the base portion without screwing, and the cover portion can be prevented from cracking due to an impact at the time of mounting or using. The small transformer in the electronic device according to claim 2, wherein the small transformer can be fixed to the base portion without being screwed, so that the mounting work can be easily performed, the number of parts can be reduced, and the cost can be reduced. According to the fixing structure, the small transformer can be fixed to the base portion by the action of the elastic force of the concave portion of the upper side portion of the transformer holding portion, so that the small transformer can be firmly fixed to the base portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a security hands-free intercom to which a transformer fixing structure according to the present invention is applied.

FIG. 2 is a partial plan sectional view showing an embodiment of a fixing structure for a transformer according to the present invention.

FIG. 3 is a front view showing a printed circuit board of a transformer.

FIG. 4 is a plan view showing a main part of a fixing structure for a transformer according to the present invention.

FIG. 5 is a front vertical sectional view showing a state where a transformer is fixed.

FIG. 6 is a side vertical cross-sectional view showing a state where the transformer is fixed.

FIG. 7 is an external view of a security handsfree intercom.

FIG. 8 is a bottom view of the security handsfree intercom.

FIG. 9 is a system configuration diagram of a security hands-free intercom system.

FIG. 10 is a partial perspective view showing a first example of a switch part for not connecting a gas sensor.

FIG. 11 is a partial bottom view showing a closed state of the opening / closing mechanism of the switch unit of the first example.

FIG. 12 is a perspective view of essential parts showing an open state of the opening / closing mechanism of the switch unit of the first example.

FIG. 13 is a partial perspective view showing a second example of the gas sensor non-connection switch section.

FIG. 14 is a partial bottom view showing a closed state of the opening / closing mechanism of the switch unit of the second example.

FIG. 15 is a partial perspective view showing a modified example of the gas sensor non-connection switch section.

FIG. 16 is a partial vertical cross-sectional view of a switch section of the modification.

[Explanation of symbols]

 1 Base Part 2 Cover Part 2h Pressing Protrusion 4 Small Transformer 4a Printed Circuit Board for Transformer 4b Coil Part 4c Notch Part 21 Transformer Holding Part 21a Recessed Part

Claims (3)

[Claims] 1. A small transformer is laterally arranged on a base portion, and a U-shaped frame-shaped transformer holding portion for holding and fixing a coil portion of the small transformer is provided on the base portion, and at the bottom of the small transformer. A notch is formed on the fixed transformer printed circuit board, and a pressing projection that is fitted into the notch is provided on the cover so as to project from the base by the transformer pressing part and the pressing projection. A structure for fixing a small transformer in an electronic device, which is configured to fix the small transformer. 2. The electronic device according to claim 1, wherein a concave portion is formed on an upper side portion of the transformer pressing portion for fixing the coil portion of the small transformer by applying elastic force. Fixed structure of small transformer in. 3. The electronic device is a small-sized portable communication device, and the portable communication device is provided with the small transformer, a base portion having the transformer pressing portion, and a cover portion having the pressing protrusion. The fixing structure for a small transformer in an electronic device according to claim 1, wherein the fixing structure is a small transformer.