JPH062764U - Device structure with light emitting element mounting substrate - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the volume occupied by a circuit board in a device provided with a light emitting element for notification on the side opposite to the component mounting surface. A circuit board 3 is provided on the inner surface of a housing 2b so that one board surface is adjacently arranged and the other board surface has electronic components 4 and 5 mounted thereon. This circuit board 3 has a light emitting element L.
A hole 6 is formed at a position where the ED 1 is mounted, and the light emitting element LED1 is inserted into the hole 6 with the direction of light emission facing the housing 2b. A display window 2c is formed in the housing 2b at a position facing the hole 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a device in which a circuit board on which a light emitting element is mounted is installed.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, for example, electric devices such as an electric shaver have been provided with an external notification of the operating state so that the user can easily confirm the operating state. As this type of notification means, a light emitting element such as a light emitting diode is generally used and mounted on a circuit board.

3 and 4 are cross-sectional views of a circuit board showing a conventional component mounting state. In FIG. 3, all the other components 21 including the light emitting diode LED11 are mounted on the same surface of the circuit board 22, and the light emission direction of the light emitting diode LED11 is the mounting surface side of the other component 21. Therefore, the notification means is provided on the mounting surface side. In this case, the lower surface of the circuit board 22 can be arranged adjacent to the housing of this device.

In addition, FIG. 4 shows that the light emitting diode LED12 is mounted on the side opposite to the other components 23 and 24, so that the light emitting direction of the light emitting diode LED12 is different from the mounting surface side of the other components 23 and 24. It is the opposite. Therefore, when it is desired to provide the notification means on the side opposite to the mounting surface side, the notification means is mounted as shown in FIG.

[0005]

[Problems to be solved by the device]

 However, in the mounting method shown in FIG. 4, since the light emitting diode LED12 is mounted on the surface opposite to the other components 23 and 24, the mounting dimension of the light emitting diode LED12 is required between the circuit board 22 and the housing of the device, and especially the thickness It is difficult to meet the demands for downsizing of equipment because of restrictions on the size.

Further, the solder reflow for mounting the component is repeated twice, which may reduce the reliability of the component.

The present invention has been made in view of the above problems, and in a device provided with a light emitting element for notifying on the side opposite to the component mounting surface, a light emitting element mounting board in which the volume occupied by the circuit board is reduced is provided. It is an object to provide a device structure provided with the device.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides an apparatus having a housing and a circuit board in which one board surface is disposed adjacent to the inner surface of the housing, and an electronic component is mounted on the other board surface. , The circuit board is provided with a hole at a position where the light emitting element is mounted, and the light emitting element is inserted into the hole so that the light emitting direction is the one board surface side, and the housing is provided with the hole. A display window is formed at a position facing the.

[0009]

[Action]

 According to the present invention, since the light emitting device is inserted into the hole of the circuit board, one board surface is disposed adjacent to the inner surface of the housing. Further, the display window notifies the user that the light emitting element is turned on.

[0010]

【Example】

 FIG. 2 is a circuit block diagram showing an example of a charger to which a device including a light emitting device mounting substrate according to the present invention is applied. A rectifying bridge BD is connected to the AC power supply, and the primary winding L1 of the transformer T1 and the switching terminal of the transistor Q3 are connected in series between both terminals of the rectifying bridge BD. Further, the rectification bridge BD supplies power to the charging control circuit 11 via the resistor R3. The output terminal P1 of the charge control circuit 11 is connected to the base of the transistor Q3 and controls the on / off of the transistor Q3.

A diode D1 and a storage battery 12 are connected in series between both ends of the secondary winding L2 of the transformer T1.

The charging control circuit 11 controls this charger, and controls the on / off of the transistor Q3 to switch the primary winding L1 to switch the voltage induced in the secondary winding L2. It rectifies by the diode D1 and supplies a charging current to the storage battery 12 to charge it.

Further, a series circuit including a resistor R1, a light emitting diode LED1, and a transistor Q1 and a series circuit including a resistor R2, a light emitting diode LED2, and a transistor Q2 are connected in parallel between both electrodes of the storage battery 12. . The bases of the transistors Q1 and Q2 are connected to the output terminals P2 and P3 of the charging control circuit 11 via the resistors R4 and R5.

The light emitting diode LED1 indicates that charging is in progress, and the light emitting diode LED2 indicates that charging is complete.

That is, during charging, the output terminal P2 outputs the “H” level and the output terminal P3 outputs the “L” level to turn on the transistor Q1 and turn off the transistor Q2. Only the light is turned on, and the charging indication is displayed.

On the other hand, when the charging is completed, the output terminal P2 outputs the “L” level, the output terminal P3 outputs the “H” level, the transistor Q2 is turned on, and the transistor Q1 is turned off to emit light. The diode LED2 is turned on, the light emitting diode LED1 is turned off, and the charging completion display is performed.

At this time, the loss generated in the resistors R1 and R2 is 0.01 W when the battery voltage of the storage battery 12 is 4 V and the current flowing through the resistors R1 and R2 is 4 mA. Therefore, the chip resistors can be used as the resistors R1 and R2, and the charging circuit can be downsized and heat generation can be prevented.

As described above, since the light emitting diodes LED1 and LED2 are arranged not on the primary side of the transformer T1 but on the secondary side, the permissible loss is smaller than that in the case of arranging on the primary side. The circuit can be composed of parts and low withstand voltage parts, and it is possible to reduce the size and cost. Further, since the loss is small, it is possible to relatively easily increase the current supplied to the light emitting diodes LED1 and LED2 to brighten the lighting.

The anode of the light emitting diode LED2 may be connected between the resistor R1 and the light emitting diode LED1 to remove the resistor R2.

FIG. 1 is a sectional view showing a component mounting state of a device including a light emitting element mounting substrate according to the present invention. The outside of the main body of the device 1 including the light emitting element mounting substrate is formed of housings 2a and 2b made of synthetic resin or the like. On the circuit board 3, surface mount components 4 and 5 which constitute the charge control circuit 11 and the like are mounted. The circuit board 3 is constrained by the shape of the housing 2a determined by the efficient arrangement of the built-in members and the design, and the positions of the parts 4 and 5 are designed so that the respective parts 4 and 5 are mounted according to the shape. Has been done.

The light emitting diode LED1 is a surface-mounted component, and is mounted on the same side as the components 4 and 5. The hole 6 is provided at the mounting position of the light emitting diode LED1 in the circuit pattern of the circuit board 3, and the main body of the light emitting diode LED1 is inserted into the hole 6 so that the direction of light emission is set to the housing 2b side.

By forming the display window 2c at a position facing the light emitting diode LED1 of the housing 2b, the display portion of the device 1 including this light emitting element mounting substrate can be provided on the housing 2b side.

Further, since the light emitting diode LED1 is mounted on the same surface side as the other components 4 and 5, the solder reflow only needs to be performed once, and the reliability of the components does not deteriorate.

The display window 2c may be provided with a hole in that portion or may be covered with a transparent member.

[0025]

[Effect of device]

 As described above, the present invention relates to an apparatus having a housing and a circuit board in which one board surface is adjacently arranged on the inner side surface of the housing, and an electronic component is mounted on the other board surface. A hole is formed at a position where the light emitting element is mounted, and the above light emitting element is inserted into the hole so that the light emitting direction is the one substrate surface side, and the housing is at a position facing the hole. Since the display window is formed in the device, in a small-sized device whose thickness is restricted, it is possible to provide the notification means by the light emitting element while the surface opposite to the mounting surface of the component is adjacent to the inner surface of the housing. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a component mounting state of a device including a light emitting element mounting substrate according to the present invention.

FIG. 2 is a circuit block diagram showing an example of a charger to which a device including the light emitting element mounting substrate is applied.

FIG. 3 is a cross-sectional view of a circuit board showing a conventional component mounting state.

FIG. 4 is a cross-sectional view of a circuit board showing a conventional component mounting state.

[Explanation of symbols]

 1 Equipment equipped with light emitting element mounting substrate 2a, 2b Housing 2c Display window 3 Circuit board 4, 5 Surface mounting component 6 Hole 11 Charging control circuit 12 Storage battery BD Rectifying diode D1 Diode L1 Primary winding L2 Secondary winding LED1, LED2 Light emitting diode Q1 to Q3 Transistor R1 to R5 Resistor T1 Transformer

Claims (1)

[Scope of utility model registration request] 1. A device comprising: a housing; and a circuit board in which one board surface is disposed adjacent to an inner side surface of the housing, and an electronic component is mounted on the other board surface, wherein the circuit board includes a light emitting element. Holes are drilled at the mounting position,
The light emitting element is mounted in the hole so that the direction of light emission is directed to the one substrate surface side, and the housing has a display window formed at a position facing the hole. A device structure with a substrate.