JP2014135137A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus in which a printed circuit board equipped with an LED lamp and a front panel provided with a light passing hole are overlapped with each other, and which can widen a range in which light emitted from the LED lamp can be seen.SOLUTION: An electronic apparatus includes a printed circuit board 5 equipped with an LED lamp 402, and a front panel 6 arranged in a light emitting direction of the LED lamp 402, overlapped with the printed circuit board 5, and provided with a light passing hole 602 for allowing passage of light emitted from the LED lamp 402. An inner peripheral surface of the light passing hole 602 of the front panel 6 is provided with a reflection film 8.

Description

  The present invention relates to an electronic device in which a printed circuit board on which an LED lamp is mounted and a front panel provided with a light extraction hole are overlapped.

  Some inverter devices, which are a kind of electronic equipment, include an operation panel for setting operation of an inverter circuit.

  The operation panel is provided with display means using a 7-segment LED, an LED lamp, or the like (see, for example, Patent Document 1). The 7-segment LED is used to display the names and set values of control parameters that control the operation of the inverter circuit. The LED lamp is used for displaying on / off of a power source, an operation state of an inverter circuit, and the like.

  This type of operation panel includes a front panel provided on the outer surface of the inverter device, and a printed circuit board disposed in the inverter device so as to overlap the front panel. On the printed circuit board, input means such as a push switch is mounted in addition to a 7-segment LED or LED lamp which is a display means. The front panel is formed with a light extraction hole through which light emitted from a 7-segment LED or LED lamp passes, a pressing portion for pressing a pressing switch, and the like.

Japanese Patent Laid-Open No. 06-110408

  The LED lamp in the operation panel is provided such that the outgoing optical axis coincides with the front direction of the front panel. Therefore, a component having a large inclination from the output optical axis in the light emitted from the LED lamp (hereinafter also referred to as “emitted light”) is reflected from the inner peripheral surface of the light extraction hole and then from the front direction of the front panel. Light is emitted in an oblique direction with a large inclination.

  However, the LED lamp has high directivity of emitted light, and the light emitted in the direction in which the inclination from the outgoing optical axis is large is weak. For this reason, the intensity of the light reflected from the inner peripheral surface of the light extraction hole and emitted in an oblique direction from the front panel is low. In particular, when the front panel is a dark color such as black, most of the light incident on the inner peripheral surface of the light extraction hole is absorbed, so light that is reflected by the inner peripheral surface and exits from the front panel in an oblique direction. The strength of is further reduced. As a result, there is a problem that it is difficult to determine whether or not the LED lamp is lit when the front panel is viewed from an oblique direction.

  Note that the above problem occurs not only in the inverter device, but also in all electronic devices including an operation panel in which a printed circuit board on which an LED lamp is mounted and a front panel provided with a light extraction hole are overlapped.

  The present invention has been made in view of the above, and in an electronic device in which a printed circuit board on which an LED lamp is mounted and a front panel provided with a light extraction hole are arranged to overlap each other, light emitted from the LED lamp is emitted. The purpose is to widen the visible range.

  In order to achieve the above-mentioned object, an electronic device according to claim 1 of the present invention is disposed so as to overlap a printed circuit board on which an LED lamp is mounted, and the printed circuit board in a light emitting direction of the LED lamp, In an electronic apparatus including a front panel provided with a light extraction hole for allowing light emitted from the LED lamp to pass therethrough, a reflection film is provided on an inner peripheral surface of the light extraction hole of the front panel.

  According to a second aspect of the present invention, an electronic apparatus includes a printed circuit board on which an LED lamp is mounted and light emitted from the LED lamp, which is disposed so as to overlap the printed circuit board in the light emission direction of the LED lamp. In an electronic apparatus including a front panel provided with a light extraction hole through which light passes, a mirror finish is applied to the inner peripheral surface of the light extraction hole of the front panel.

  An electronic device according to a third aspect of the present invention is the electronic device according to the first or second aspect, wherein the front panel has a color opposite to a light emission color of the LED lamp.

  According to a fourth aspect of the present invention, in the electronic device according to any one of the first to third aspects, an uneven portion is provided on the inner peripheral surface of the light extraction hole of the front panel. Features.

  According to the present invention, part of the light emitted from the LED lamp is reflected by the reflective film provided on the inner peripheral surface of the light extraction hole, and is emitted in an oblique direction with a large inclination from the front direction of the front panel. Since the light reflected by the reflective film is less likely to have a decrease in intensity due to reflection, it is possible to suppress a decrease in the intensity of light emitted from the front panel in an oblique direction. Therefore, it is easy to see whether or not the LED lamp is lit even when the front panel is viewed from an oblique direction. That is, the electronic device according to the present invention can widen the range in which the light emitted from the LED lamp can be visually observed.

FIG. 1 is a block diagram showing a schematic configuration of an inverter device according to Embodiment 1 of the present invention. FIG. 2 is a front view showing a configuration example of an operation panel in the inverter device of the present embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an enlarged cross-sectional view of the first LED lamp and its periphery in FIG. FIG. 5 is a cross-sectional view showing the main part of the operation panel in the inverter device according to Embodiment 4 of the present invention. FIG. 6 is a cross-sectional view showing the main part of the operation panel in the inverter device according to Embodiment 5 of the present invention.

  Hereinafter, embodiments of an electronic device according to the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of an inverter device according to Embodiment 1 of the present invention. FIG. 2 is a front view showing a configuration example of an operation panel in the inverter device of the present embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG.

  In the present embodiment, as an electronic apparatus according to the present invention, an inverter device that supplies electric power to an AC motor that drives an electric pump or the like is cited. As shown in FIG. 1, the inverter device includes an inverter circuit 1, a control unit 2, an input unit 3, and a display unit 4.

  The inverter circuit 1 is a circuit that converts DC power or AC power supplied from a power source into AC power having a predetermined frequency and outputs the power, and is constructed of a semiconductor element such as an IGBT (Insulated Gate Bipolar Transistor). The frequency of the AC power output from the inverter circuit 1 is controlled by the inverter circuit control unit 202 of the control means 2.

  The control unit 2 controls the operation of the inverter device, and includes an input receiving unit 201, an inverter circuit control unit 202, a display control unit 203, and a memory 204. The input reception unit 201 receives an input signal from the input unit 3, causes the inverter circuit control unit 202 and the display control unit 203 to perform a control operation based on the input signal, and stores the input signal in the memory 204. The inverter circuit control unit 202 controls the inverter circuit 1 based on an input signal from the input unit 3, a control program stored in the memory 204, a set value of a control parameter, and the like. The display control unit 203 controls display by the display unit 4 based on an input signal from the input unit 3, a command from the inverter circuit control unit 202, and the like.

  The input means 3 is for inputting commands for starting and ending the inverter device, setting values of control parameters necessary for controlling the inverter circuit 1, and includes a plurality of switches such as a push switch and a rotary switch.

  The display means 4 displays the operating state of the inverter device, the set values of the control parameters, and the like, and includes a 7-segment LED 401, a first LED lamp 402, a second LED lamp 403, and the like. The 7-segment LED 401 is used to display the name and setting value of the control parameter. The LED lamps such as the first LED lamp 402 and the second LED lamp 403 are used to display the operating state of the inverter device such as power on / off and the operating state of the inverter circuit.

  The input means 3 and the display means 4 in this type of inverter device are integrated as an operation panel, and are arranged on the surface of a housing that houses the inverter circuit 1 and the like.

  As shown in FIGS. 2 and 3, the operation panel includes a printed circuit board 5, a front panel 6, and a top sheet 7.

  The printed circuit board 5 is a circuit board on which a pressing switch 301 as the input unit 3 and a display unit 4 (7-segment LED 401, first LED lamp 402, etc.) are mounted. The printed circuit board 5 emits emitted light from the 7-segment LED 401, the first LED lamp 402, and the like toward the outside of the inverter device, and the emitted optical axis LX of the first LED lamp 402 is the front of the operation panel. It arrange | positions so that it may correspond with a direction. The printed circuit board 5 may be a circuit board with a built-in control circuit as the control means 2 or may be a circuit board different from the control board on which the control circuit as the control means 2 is formed. Good.

  The front panel 6 is a cover member that is disposed so as to overlap the printed circuit board 5 in the light emitting direction of the first LED lamp 402 and the like. The front panel 6 is provided with a display window 601 that exposes the display surface of the 7-segment LED 401 and a light extraction hole 602 that allows light emitted from an LED lamp such as the first LED lamp 402 to pass therethrough. The front panel 6 is also provided with a pressing portion (not shown) for pressing the pressing switch 301, an insertion hole for inserting the shaft of the rotary switch, and the like. Further, the front panel 6 in the inverter device of the present embodiment is provided with a reflective film 8 on the inner peripheral surface of the light extraction hole 602. The reflective film 8 is provided by attaching a silver thin film to the inner peripheral surface of the light extraction hole 602.

  The top sheet 7 is a sheet-like member on which the function of a switch such as the push switch 301 and the role of an LED lamp such as the first LED lamp 402 are printed. In FIG. 2, “power supply” is described on the side of the first LED lamp 402. Thus, the first LED lamp 402 indicates that the power is on / off. In addition, the circle portion 710 described as “reset” in FIG. 2 is in a position overlapping the press switch 301, and when the circle portion 710 is pressed, the press switch 301 is turned on and the power supply is reset. That is, the circular portion 710 functions as a power reset key. Similarly, the four circular portions 711 to 714 at the lower right portion of the top sheet 7 in FIG. 2 function as setting keys when setting control parameters and the like.

  The front panel 6 in the inverter device of the present embodiment is provided with the reflective film 8 on the inner peripheral surface of the light extraction hole 602 as described above. The operational effects of providing the reflective film 8 will be described with reference to FIG.

  FIG. 4 is an enlarged cross-sectional view of the first LED lamp and its periphery in FIG.

As shown in FIG. 4, the first LED lamp 402 has an outgoing optical axis LX that coincides with the front direction of the operation panel (front panel 6). Outgoing light of the first LED lamp 402 has a high directivity, the strongest intensity of the light L ₀ emitted to the emission optical axis LX direction. The light L ₁ emitted in an oblique direction with a large inclination from the emission optical axis LX is weaker than the light L ₀ .

When the reflective film 8 is not provided on the inner peripheral surface of the light extraction hole 602 of the front panel 6, the light L ₁ emitted from the first LED lamp 402 is reflected when reflected by the inner peripheral surface of the light extraction hole 602. Part of it is absorbed and the strength decreases. For this reason, the light L _{1 that} has passed through the light extraction hole 602 has a very low intensity, and is difficult to view. Further, the light L ₁ having a low intensity reflected by the light extraction hole 602 is emitted in an oblique direction outside the field of view range LA in which the inner peripheral surface is extended in the front direction of the front panel 6. That is, when the reflective film 8 is not provided, it is difficult to determine whether or not the first LED lamp 402 is lit when the front panel 6 is viewed from an oblique direction outside the visual field range LA.

In contrast, if the reflective film 8 as in the present embodiment is provided, since the light L ₁ emitted from the first LED lamp 402 is reflected by the reflective film 8, is less reduced in strength due to reflections. Therefore, suppressing a decrease in the intensity of light exiting obliquely to the outside of the view range LA as light L _1. As a result, the light L ₁ can be viewed when the front panel 6 is viewed from the traveling direction of the light L ₁ . Therefore, in the inverter device of the present embodiment, the range in which the light emitted from the first LED lamp 402 can be viewed is wider than the visual field range LA, and the first panel is also seen when the front panel 6 is viewed from an oblique direction. It can be seen whether or not the LED lamp 402 is lit.

  As described above, the inverter device according to the present embodiment is provided with the reflective film 8 on the inner peripheral surface of the light extraction hole 602 through which the light emitted from the LED lamp passes, so that the range in which the light from the LED lamp can be visually observed. Can be wide.

  The reflection film 8 only needs to have a high reflectance with respect to light emitted from the LED lamp such as the first LED lamp 402. Therefore, the reflective film 8 is not limited to the above-described silver thin film, and may be provided by attaching a thin film such as aluminum. The reflective film 8 may be formed by a plating method instead of attaching a silver or aluminum thin film. In addition, the reflective film 8 may be provided by applying a paint having a high brightness such as a white paint.

  Furthermore, in the inverter device of the present embodiment, the color of the front panel 6 may be opposite to the emission color of the LED lamp such as the first LED lamp 402. In this case, the outer surface 603 of the front panel 6 shown in FIG. 4 has a color opposite to the emission color of the first LED lamp 402. Therefore, the light of the first LED lamp 402 can be made conspicuous, and the light emitted in the oblique direction of the front panel 6 can be further visually observed.

(Embodiment 2)
The inverter device of the present embodiment is obtained by mirror-finishing the inner peripheral surface of the light extraction hole 602 of the front panel 6 instead of providing the reflective film 8 described in the first embodiment. That is, after the sheet metal is pressed to form the front panel 6, the inner peripheral surface of the light extraction hole 602 is polished and mirror-finished to increase the reflectance of the inner peripheral surface. Thereby, the same effect as that of the inverter device described in the first embodiment can be obtained.

  In addition, when grind | polishing the internal peripheral surface of the light extraction hole 602, it is needless to say that not only a mirror surface but the surface which has the glossiness close | similar to a mirror surface may be used.

(Embodiment 3)
Unlike the first and second embodiments, the inverter device according to the present embodiment uses a material that is used for the front panel 6 in a color in which the light of the first LED lamp 402 is easily reflected. 6 makes it easy to see the light emitted in an oblique direction.

  When the front panel 6 is formed by resin molding, the degree of freedom of the color of the resin used is high, and the glossiness of the inner peripheral surface of the light extraction hole 602 can be increased. Therefore, if the front panel 6 is formed using a resin having a high brightness such as white and easily reflects light, a decrease in light intensity due to reflection on the inner peripheral surface of the light extraction hole 602 can be suppressed. Thereby, the effect similar to the inverter apparatus quoted in Embodiment 1 and Embodiment 2 is acquired.

  At this time, if the color of the front panel 6 is set to a color opposite to the emission color of the first LED lamp 402, the light of the first LED lamp 402 can be made conspicuous, and the visual observation becomes easier.

(Embodiment 4)
FIG. 5 is a cross-sectional view showing the main part of the operation panel in the inverter device according to Embodiment 4 of the present invention.

  As shown in FIG. 5, the inverter device of the present embodiment increases the inclination angle θ1 of the light extraction hole 602 formed in the front panel 6 so that the light in the first LED lamp 402 can be visually observed. Make it wide.

When the inclination angle θ1 of the light extraction hole 602 is increased, the visual field range LA is widened. Furthermore, after exiting from the first LED lamp 402, the maximum angle θ2 of the light L ₂ to Idemitsu without being reflected by the inner circumferential surface of the light emission hole 602 is increased. Note that the angle θ2 is an inclination angle of the first LED lamp 402 from the outgoing optical axis LX. Accordingly, the light emission hole 602 a reduction in the intensity of the light L ₂ due to the reflection on the inner peripheral surface can be prevented, and a reduction in the intensity of light exiting from the front panel 6 in the oblique direction can be prevented.

  Thus, by increasing the inclination angle θ1 of the light extraction hole 602 and reducing the component reflected from the inner peripheral surface of the light emitted from the first LED lamp 402, the light of the first LED lamp 402 is obtained. Can be widened.

  In addition, when the inclination angle θ1 of the light extraction hole 602 is increased as in the present embodiment, the reflective film 8 described in the first embodiment is provided, or the mirror finish described in the second embodiment is performed. In addition, the range in which the light from the first LED lamp 402 can be viewed can be widened.

In FIG. 5, the inclination angle θ < _b > 1 of the light extraction hole 602 is smaller than the angle θ < _b > ₂ of the light L < _b > ₂ emitted from the first LED lamp 402. It may be larger than θ2. In particular, if the inclination angle θ1 of the light extraction hole 602 is larger than the maximum emission angle of the light emitted from the first LED lamp 402, all of the light emitted from the first LED lamp 402 is within the light extraction hole 602. Since the light is emitted without being reflected on the peripheral surface, the range in which the light of the first LED lamp 402 can be visually observed can be further widened.

(Embodiment 5)
FIG. 6 is a cross-sectional view showing the main part of the operation panel in the inverter device according to Embodiment 5 of the present invention.

  As shown in FIG. 6, the inverter device of the present embodiment has an intermediate portion in the depth direction (in the direction of the emitted light axis LX of the first LED lamp 402) on the inner peripheral surface of the light extraction hole 602 of the front panel 6. An uneven portion 602a is provided. The front panel 6 is formed by pressing a sheet metal and then forming an uneven portion 602a on the inner peripheral surface of the light extraction hole 602 by etching and mirroring the inner peripheral surface.

Of the light passing through the light emission hole 602 is emitted from the first LED lamp 402, the light _{L 1} reflected by the inclined surface of the first LED lamp 402 side of the concavo-convex portion 602a is reflected by the inner circumferential surface Thereafter, the light exits from the front panel 6 in an oblique direction. Therefore, the range in which the light emitted from the first LED lamp 402 can be viewed can be widened.

On the other hand, the light L ₃ incident on the concave-convex portion 602a of the light emission hole 602 is reflected in a direction different from the direction of light reflection L3' when the relief portion 602a is assumed to be inclined. For this reason, it is possible to change the illuminance of the light emitted to the visual field range LA without changing the luminance of the first LED lamp 402.

  To adjust the illuminance of the first LED lamp 402 in the conventional inverter device, the luminance of the first LED lamp 402 is controlled, or the lighting time of the first LED lamp 402 and the like as in Patent Document 1 is set. It is necessary to control. That is, the illuminance of the first LED lamp 402 is electrically controlled. Therefore, there is a problem that the configuration of the display control circuit as the display control unit 203 of the control unit 2 shown in FIG. 1 is complicated, and the power consumption of the display control circuit is increased.

  On the other hand, in the inverter device of the fifth embodiment, the illuminance of the first LED lamp 402 is changed by the uneven portion 602a provided on the inner peripheral surface of the light extraction hole 602 of the front panel 6. That is, since the illuminance can be changed without electrical control, it is possible to prevent the configuration of the display control circuit from becoming complicated and the power consumption from increasing.

  As mentioned above, although the embodiment of the electronic device according to the present invention has been described, the present invention is not limited to the configuration shown in the above embodiment, and can be appropriately changed without departing from the gist thereof. Of course.

  For example, the present invention is not limited to an inverter device, but can be applied to various electronic devices including an operation panel in which a printed circuit board on which an LED lamp is mounted and a front panel provided with a light extraction hole are overlapped. In addition, the present invention is not limited to an electronic device having an operation panel in which the input unit 3 and the display unit 4 are integrated, but the power state of the power source such as the first LED lamp 402 and the operation state of the inverter circuit The present invention can also be applied to an electronic device including a display panel in which only LED lamps used for display such as these are integrated.

DESCRIPTION OF SYMBOLS 1 Inverter circuit 2 Control means 201 Input reception part 202 Inverter circuit control part 203 Display control part 204 Memory 3 Input means 301 Press switch 4 Display means 401 7 segment LED
402 1st LED lamp 403 2nd LED lamp 5 Printed circuit board 6 Front panel 601 Display window 602 Light extraction hole 602a Concavity and convexity 7 Surface sheet 8 Reflective film LX Emission optical axis LA Field of view L ₀ , L ₁ , L ₂ , L ₃ light

Claims (4)

A printed circuit board on which an LED lamp is mounted, and a front panel that is disposed so as to overlap the printed circuit board in the light emission direction of the LED lamp and is provided with a light extraction hole that allows light emitted from the LED lamp to pass therethrough. In the electronic equipment provided,
An electronic apparatus comprising a reflective film on an inner peripheral surface of a light extraction hole of the front panel. A printed circuit board on which an LED lamp is mounted, and a front panel that is disposed so as to overlap the printed circuit board in the light emission direction of the LED lamp and is provided with a light extraction hole that allows light emitted from the LED lamp to pass therethrough. In the electronic equipment provided,
An electronic apparatus, wherein a mirror finish is applied to an inner peripheral surface of a light extraction hole of the front panel.   The electronic device according to claim 1, wherein the front panel has a color opposite to an emission color of the LED lamp.   The electronic apparatus according to claim 1, wherein an uneven portion is provided on an inner peripheral surface of the light extraction hole of the front panel.

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