JP2020042273A - Light emitting display device and air compressor - Google Patents

Abstract

To provide a light emitting display device that simplifies its configuration and is excellent in vibration resistance, and an air compressor.SOLUTION: A light emitting display device 1 comprises: a substrate part 30 on which LEDs 40 are disposed, and a case body 20. The case body 20 is attached to the substrate part 30 to cover a substrate surface 30a on which the LEDs 40 are disposed. On a ceiling face of the case body 20, a side face wall 20b having a certain height is formed, and a seal member 25 is provided between the side face wall 20b and an outer edge part of the substrate part 30a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a light-emitting display device and an air compressor, and more particularly, to a light-emitting display device and an air compressor having a substrate on which LEDs are provided and a case body on which the substrate is mounted.

  Conventionally, a seven-segment LED unit that emits and displays characters (alphabet) and numbers by a seven-segment structure in which LEDs (light emitting diodes: light-emitting diodes) are arranged at the center of each side of the character “8” of Arabic numerals has been used. It is known (see Patent Document 1).

  A general seven-segment LED unit includes a rectangular housing case with an open bottom, a board portion provided with a plurality of leads for supplying electricity to the LEDs, and seven LEDs arranged on the board portion. And the general configuration. Each LED is disposed on the substrate so as to be located at the center of each side of the character "8", and the leads are connected to the LEDs disposed on the substrate so as to be able to conduct electricity. You.

  On the ceiling surface of the housing case, seven openings corresponding to the positions where the LEDs are provided are provided. The opening is formed by an internal space penetrating the ceiling surface of the housing case. This space has a tapered cross-sectional shape that widens from the inner surface of the case to the outer surface of the case. The board portion provided with the LED and the lead is provided inside from the open bottom side of the housing case, and is attached in a state where the LED enters the bottom of the space in the opening. When the substrate is attached to the housing case, the space of the opening is filled with a light-guiding resin. When the LED is turned on, the light of the LED is emitted to the outside of the housing case through the light-guiding resin filled in the opening, so that predetermined characters and numerals can be displayed. I have.

JP 2001-327771 A

  In recent years, liquid crystal panel units have been increasingly used in place of 7-segment LED units due to the effects of diversification of display contents required for display screens and lower prices. The liquid crystal panel unit is capable of various displays not limited to characters and numbers. For this reason, at present, the sales and distribution amount of the 7-segment LED unit is decreasing, and the 7-segment LED unit tends to be higher in cost than the liquid crystal panel unit.

  On the other hand, since air compressors and the like used in construction sites and the like are often used outdoors, vibration resistance, water resistance, dust resistance, electric resistance, and the like are required. For this reason, it is not easy to use a liquid crystal panel unit, which is inferior in vibration resistance, water resistance, dust resistance, electric resistance, etc., in the light emitting display portion of the air compressor. Have been.

  On the other hand, since the 7-segment LED unit is a general-purpose product as described above, when the 7-segment LED unit is used in a light-emitting display device, the 7-segment LED unit is used to accommodate the general-purpose 7-segment LED unit. Structure tended to be complicated. Furthermore, when a general-purpose 7-segment LED unit is used, it is necessary to ensure vibration resistance, water resistance, dust resistance, electric resistance, and the like for the light-emitting display device. There is a problem that the difficulty of design increases.

  The present invention has been made in view of the above problems, and has as its object to provide a light emitting display device and an air compressor which are simplified in structure and have excellent vibration resistance and the like.

  In order to solve the above problem, a light emitting display device according to the present invention includes a substrate portion on which an LED is disposed, and a substrate surface on a side on which the LED is disposed, which is mounted on the light emitting display device. Is performed, a side wall having a fixed height is formed on a ceiling surface of the case body, and a seal member is provided between the side wall and an outer edge of the substrate unit. It is characterized by.

  The light-emitting display device according to the present invention has a structure in which the case main body is directly opposed to the LEDs arranged on the substrate since the substrate is attached to the case main body such that the substrate surface is covered. With this structure, the distance between the case main body and the LED can be reduced, so that the brightness of the LED visually recognized from the ceiling surface side of the case main body can be increased.

  Further, the light emitting display device according to the present invention includes an LED, a substrate unit, and a main body case. Therefore, there is no need to use a general-purpose 7-segment LED unit, which simplifies the structure and increases the degree of freedom in designing the light-emitting display device. Further, cost can be reduced.

  Further, in the above-described light emitting display device, the substrate portion may be a single-sided mounting substrate having a conductive portion provided on one surface.

  In the light emitting display device according to the present invention, the back surface can be insulated by forming the substrate portion as a single-sided mounting substrate having a conductive portion disposed on one surface. For this reason, the coating on the back side becomes unnecessary, and it becomes easy to secure dustproof and waterproof properties.

  In the light emitting display device described above, a sheet for protecting the surface may be attached to the case body.

  Further, an air compressor according to the present invention includes the above-described light emitting display device.

  Further, in the air compressor described above, the light emitting display device includes a display unit using the LED, a power button for driving the air compressor, a mode switching button for switching a driving mode, and a set driving mode. May be provided.

  The light-emitting display device and the air compressor according to the present invention have a structure in which the case main body is directly opposed to the LEDs provided on the substrate, since the substrate is attached to the case main body such that the substrate surface is covered. ing. With this structure, the distance between the case main body and the LED can be reduced, so that the brightness of the LED visually recognized from the ceiling surface side of the case main body can be increased.

  Further, a light emitting display device and an air compressor according to the present invention include an LED, a substrate, and a main body case. Therefore, there is no need to use a general-purpose 7-segment LED unit, which simplifies the structure and increases the degree of freedom in designing the light emitting display device. Further, cost can be reduced.

  Furthermore, in the light emitting display device and the air compressor according to the present invention, the back surface can be insulated by forming the substrate portion as a single-sided mounting substrate having a conductive portion disposed on one surface. For this reason, the coating on the back side becomes unnecessary, and it becomes easy to secure dustproof and waterproof properties.

1 is an external perspective view illustrating an air compressor provided with a light emitting display device according to an embodiment. (A) is a figure showing the front appearance of the light emitting display concerning an embodiment, and (b) is a figure showing the front appearance in the state where the sheet for surface protection was removed. 3A and 3B are a cross-sectional view and a partially enlarged view showing an AA cross section in FIG. 3A and 3B are a cross-sectional view and a partially enlarged view showing a BB cross section in FIG.

  Hereinafter, an example of a light emitting display device and an air compressor according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an air compressor 100 provided with a light emitting display device 1 according to the present invention. The air compressor 100 has a role of supplying compressed air to a driving tool such as a nailing machine using compressed air. A pair of air tanks 102a and 102b is provided below the housing 101 of the air compressor 100. In the air compressor 100, the air in the air tank is compressed by driving a motor (not shown), and the inside of the air tank is maintained at a constant high pressure. Air chucks 103a and 103b to which air hoses for supplying compressed air to the driving tool are attached are provided at the left and right front portions of the air compressor 100. In the vicinity of the air chucks 103a and 103b, pressure reducing valve adjustment handles 104a and 104b and pressure reducing valve removal pressure gauges 105a and 105b are provided. By operating the pressure reducing valve adjustment handles 104a and 104b, the pressure of the compressed air output from the air chucks 103a and 103b can be adjusted.

  On the front of the air compressor 100, a light emitting display device 1 is provided. As shown in FIGS. 2A and 2B, the light-emitting display device 1 is provided with a display unit 10 for 7-segment display at the upper center. The light-emitting display device 1 includes a power button 2 for driving the air compressor 100, a lighting lamp 5a for the power button, a mode switching button 3 for switching a driving mode and the like, and a set mode. To switch the voltage display to be displayed on the display unit 10, and to set a timer switching time for operating in the silent mode, and a display switching button 4 for determining the silent timer. A silent timer setting button 5, a lighting lamp 5b indicating a silent mode, and lighting lamps 5c to 5e indicating an "inspection", "warning", "diagnosis" state and the like of the air compressor are provided. In addition, in consideration of waterproofness and dustproofness of the light-emitting display device 1, the surface of the light-emitting display device 1 is disposed on the surface of the light-emitting display device 1 shown in FIG. A sheet 11 for surface protection as shown is attached.

  As shown in FIGS. 3 and 4, the light emitting display device 1 includes a case main body 20, a substrate unit 30, and a plurality of LEDs 40. As the LED 40, a small chip type LED is used. The LED 40 is disposed so as to be located at the center of each side of the letter “8” with respect to the front side 30 a of the substrate unit 30. Since the position of the character “8” on the board unit 30 is provided for three characters, if LEDs indicating a decimal point are added, 22 LEDs used for 7-segment display will be provided.

  The board unit 30 includes three LEDs (only the LED 40a of the lighting lamp 5c is shown) for the lighting lamps 5c to 5e indicating “inspection”, “warning”, and “diagnosis” states, and a lighting lamp indicating the set mode. There are provided three LEDs (not shown) for 3a to 3c, an LED (not shown) for a lighting lamp of a power button, and an LED (not shown) for a lighting lamp 5b indicating a silent mode. Further, as shown in FIGS. 3 and 4, the mode switch pressing terminal 2 a for detecting the mode switching by the mode switching button 3 and the power ON / OFF detection by the power button 2 are performed on the substrate unit 30. Power supply pressing terminal (not shown), a display switching pressing terminal 4b for determining the silent timer by the display switching button 4 and detecting the voltage display switching, and a timer time setting in the silent mode by the silent timer setting button 5. Is provided with a pressing terminal (not shown) for detecting the pressure.

  The rear surface 30b of the substrate unit 30 has a structure in which the entire surface (the entire rear surface) has no electric conductive portion. For this reason, waterproofness (water resistance) is ensured while coating is unnecessary. In addition, it is possible to reduce the risk of electric shock and the like on the back surface 30b of the substrate unit 30.

  The case body 20 has a shape in which an outer periphery of a substantially rectangular ceiling surface 20a is surrounded by a side wall 20b having a constant height, and a bottom surface side is opened by the side wall 20b. The board portion 30 on which the LEDs 40 and 40a are provided is housed inside the case body from the bottom side of the case body 20. The substrate portion 30 housed inside the case main body 20 has a front side 30a (the side on which the LEDs 40 are disposed) opposed to a lower side (the inside side of the case main body 20) of the ceiling surface 20a of the case main body 20. Thus, it is stored in the case main body 20.

  Below the ceiling surface 20a of the case body 20, a plurality of pedestals 20c for fixing the substrate 30 housed in the case body 20 are provided. On the bottom surface of the pedestal portion 20c, a screw hole to be screwed into the leg screw of the screw member 50 is formed. As a result, the board part 30 is fastened and fixed to the case body 20.

  Further, a seal member 25 is interposed between the side wall 20 b of the case body 20 and the outer edge of the substrate 30. The back surface 30b of the substrate unit 30 is waterproofed by preventing terminals from coming out. Further, since the seal member 25 is interposed between the side wall 20b and the outer edge of the substrate 30, the waterproofness and dustproofness of the case body 20 and the substrate 30 can be improved.

  A segment block portion 20d is formed on the lower surface of the ceiling surface 20a of the case body 20 at a position corresponding to the disposition position of the LED 40 so as to project over the LED 40. The segment block portion 20d is formed integrally with the case main body 20 with a predetermined thickness so that the lower surface (the bottom surface 20e) protrudes to a position near the upper surface 41 on the LED side. In addition, a gap d having a constant interval is secured between the bottom surface 20e of the segment block portion 20d and the top surface 41 of the LED 40, and the top surface 41 of the LED 40 and the bottom surface 20e of the segment block portion 20d are in contact with each other. Designed not to.

  A rectangular recess 20f is formed in the ceiling surface 20a of the case body 20 in which the segment block portion 20d is integrally formed. On the bottom surface of the recess 20f, a conduction path 51 corresponding to each side of the “8” is formed so as to face each LED 40.

  The conduction path 51 is a communication hole that connects the ceiling surface 20a of the case body 20 (more specifically, the bottom surface of the recess 20f) and the bottom surface 20e of the segment block portion 20d. The light of the LED 40 disposed on the substrate 30 can be guided to the outside of the case body 20 via the conduction path 51.

  The lower opening 51a of the conduction path 51 (the opening on the bottom surface 20e side of the segment block portion 20d) 51a has a rectangular opening having substantially the same vertical and horizontal dimensions as the upper surface 41 of the LED 40. On the other hand, the short side of the upper opening 51b (opening on the bottom side of the recess 20f) of the conduction path 51 has a width dimension substantially equal to the short side of the lower opening 51a, but the long side is represented by a seven-segment display. Are substantially equal to the length dimension (long dimension) of each side of the “8” in FIG. For this reason, as shown in FIG. 3, the conduction path 51 is formed in a tapered cross-sectional shape in which the long side width of the inside increases from the lower opening 51a to the upper opening 51b.

  Further, since the board portion 30 is attached to the case main body 20 via the pedestal portion 20c, as described above, the gap between the bottom surface 20e of the segment block portion 20d and the upper surface 41 of the LED 40 has a fixed interval. d will be secured. The gap d is determined in consideration of the light emission angle of the LED 40 so that the light at the time of light emission of the LED 40 is all guided to the lower opening 51a of the conduction path 51.

  For this reason, when the LEDs 40 are arranged at the center positions of the sides of the “8”, all the light of each LED 40 is opposed even if a light-shielding wall or the like is not provided between the adjacent LEDs 40. The conductive path 51 is guided into the conductive path 51 through the lower opening 51a. Therefore, the light of the LED 40 does not illuminate the other LED 40 or the like through the gap d, and the light may leak to another segment through another conduction path 51 for the other LED 40. Absent. The segment block portion 20d where the conduction path 51 is formed and the case body 20 are made of a black resin material to prevent light interference by the LED 40 and to prevent light reflection.

  In addition, a diffusion sheet 60 is provided on the bottom surface of the recess 20f to diffuse the light of the LED 40 guided to the upper opening 51b through the conduction path 51. The diffusion sheet 60 has vertical and horizontal dimensions corresponding to the rectangular plane of the recess 20f.

  As described above, since the conduction path 51 has a tapered cross section that widens from the lower opening 51a to the upper opening 51b, the upper opening 51b of the conduction path 51 is wider than the lower opening 51a. It will have an open area. However, since the size of the light emitting surface of the LED 40 serving as a light source is smaller than the opening area of the upper opening 51b, it is necessary to diffuse light so that the entire opening of the upper opening 51b emits light. By providing the diffusion sheet 60 on the bottom surface of the recess 20f, it is possible to cause the entire upper opening 51b to emit light while maintaining the brightness close to the light source of the LED 40. As a result, "8" of the 7-segment display is obtained. It is possible to uniformly emit light on one side of the character "" (the side on which the light emitting LED is disposed).

  Further, by providing the diffusion sheet 60, even when the air compressor 100 vibrates or the like, the light of the LED 40 can be visually recognized by the user in a stable state. Further, even when the air compressor 100 vibrates or the like, since a constant gap d is secured between the bottom surface 20e of the segment block portion 20d and the upper surface 41 of the LED 40, the upper surface 41 of the LED 40 and the segment There is no contact with the bottom surface 20e of the block portion 20d. Therefore, by securing the gap d, it is possible to prevent the LED 40 from being damaged due to vibration or the like, and also possible to prevent the visibility from being reduced due to vibration or the like by the diffusion sheet 60. Therefore, it is possible to improve the performance against vibration.

  A transparent rectangular resin plate member 62 is installed on the recess 20f where the diffusion sheet 60 is installed so as to be stacked on the diffusion sheet 60. The transparent resin plate member 62 is configured to have a vertical and horizontal dimension corresponding to the rectangular plane of the recess 20f, and is set to a height dimension such that an upper surface thereof is flush with the ceiling surface 20a at the time of installation. The transparent resin plate 62 guides the light diffused by the diffusion sheet 60 to the outside of the light emitting display device 1 without being shielded or the like. Further, by disposing the transparent resin plate member 62 in the recess 20f, it is possible to shorten the distance from the upper surface 41 of the LED 40 to the upper opening 51b of the conduction path 51, and to emit light while keeping the brightness of the LED 40 sufficiently. The light of the LED 40 can be led out of the display device 1.

  As described above, in the light emitting display device 1 according to the embodiment, the conduction path 51 is formed in the segment block portion 20d formed in the case body 20, and the bottom surface 20e of the segment block portion 20d and the upper surface 41 of the LED 40 are formed. The substrate part 30 is attached to the case main body 20 in a state in which a gap d is formed between the substrate part 30 and the base part 30. With such a configuration, the configuration is simplified as compared with the case of using a general-purpose 7-segment LED unit, so that the cost of the light-emitting display device can be reduced. In addition, since seven-segment display can be realized without using a seven-segment LED unit, the degree of freedom in designing a light-emitting display device is increased, and improvements such as thinning of the light-emitting display device are facilitated.

  Further, since it is possible to realize seven-segment display without using a seven-segment LED unit, it is easy to adjust the size of characters and numbers displayed by the seven segments. In particular, in the light emitting display device 1 described in the embodiment, the gap d is set in consideration of the light emitting angle of the LED 40 so that the light when the LED 40 emits light is guided to the lower opening 51 a of the conduction path 51. The interval is determined. For this reason, even when the arrangement interval of the LEDs 40 in the substrate unit 30 is narrow, the light of the LEDs 40 illuminates the other LEDs 40 and the like through the gap d, and the other conduction paths 51 for the other LEDs 40 Thus, light does not leak to other segments. For this reason, even when it is desired to reduce the size of characters, numerals, and the like displayed by the seven segments, and when it is necessary to reduce the arrangement interval of the LEDs 40 on the substrate unit 30, the light of the LEDs 40 is not affected by other light. The size of characters and numbers displayed by the seven segments can be easily changed (for example, reduced) without affecting (interfering) the illumination of the segments.

  Further, in the light emitting display device 1 according to the embodiment, by providing the diffusion sheet 60 on the bottom surface of the recess 20f, the entire upper opening 51b can emit light. It is possible to uniformly emit light on one side. Further, by providing the diffusion sheet 60, even when the air compressor 100 vibrates, the light of the LED 40 can be visually recognized by the user in a stable state.

  Further, since the gap d is formed between the bottom surface 20e of the segment block portion 20d and the top surface 41 of the LED 40, even when the air compressor 100 vibrates or the like, the LED 40 remains on the bottom surface of the segment block portion 20d. There is no contact with the LED 20e, and it is possible to prevent the LED 40 from being damaged by vibration or the like.

  Further, in the light emitting display device 1 according to the embodiment, the distance from the upper surface 41 of the LED 40 to the upper opening 51b of the conduction path 51 is shortened by installing the transparent resin plate 62 in the recess 20f of the case body 20. Therefore, even if the LED 40 is not a high-brightness product, it is easy to sufficiently secure the brightness, and the visibility of the light-emitting display device 1 can be improved.

  The back surface 30b of the substrate unit 30 is not particularly coated, but has no terminals or the like, and the entire back surface is insulated. Further, a seal member 25 is interposed between the side wall 20b and the outer edge of the substrate unit 30. For this reason, it becomes possible to enhance the waterproofness, dustproofness, and electric-proofness of the case body 20 and the board part 30.

  As described above, the light-emitting display device and the air compressor according to the present invention have been described in detail with reference to the drawings and an example, but the light-emitting display device and the air compressor according to the present invention are the same as those described in the above-described embodiment. Is not limited.

  For example, in the light-emitting display device 1 according to the embodiment, a 7-segment display configuration using LEDs has been described, but the configuration of the light-emitting display device is not limited to a configuration in which display is performed in 7 segments. If the configuration is such that the LED is disposed on the substrate portion, the conduction path is provided for the case main body, and the lower opening of the conduction path and the LED upper surface are opposed to each other, the substrate portion is attached to the case main body. An effect similar to that of the light-emitting display device 1 described in the embodiment can be obtained. For this reason, the same effect as the light emitting display device 1 according to the embodiment can be obtained even if the LED is not arranged on each side of the “8” formed by the 7 segments. There is no particular limitation on the arrangement position of the LEDs.

  In addition, instead of the LED display method using seven segments, a plurality of LEDs are arranged in a matrix on the board portion, and after the board portion is attached to the case body, the LEDs are formed by the conductive paths formed in a matrix. The light-emitting display device may be configured by a matrix LED system in which light is turned on and off outside the case body. Even when the light emitting display device is configured by such a matrix LED system, the same effect as the light emitting display device 1 described in the embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Light-emitting display device 2 ... Power button 2a ... Mode switching pressing terminal 3 ... Mode switching buttons 3a-3c, 5a-5e ... Lighting lamp 4 ... Display switching button 4b ... Display switching pressing terminal 5 ... Silent timer setting button 11 ... Sheet 10 (for surface protection) ... Display unit 20 ... Case body 20a ... Ceiling surface 20b ... Side wall 20c ... Pedestrian unit 20d ... Segment block unit 20e ... Bottom surface 20f (of segment block unit) ... Concave (of ceiling surface) Place 25 Sealing member 30 Substrate part 30a Front side (of substrate part) 30b Back side (of substrate part) 40, 40a LED
41 ... upper surface (of LED) 50 ... screw member 51 ... conduction path 51a ... lower opening (of the conduction path) (opening on LED side)
51b ... Upper opening (outer opening) (of the conduction path)
60 Diffusion sheet 62 Transparent resin plate 100 Air compressor 101 Enclosures 102a and 102b (of air compressor) Air tanks 103a and 103b Air chucks 104a and 104b Pressure reducing valve adjustment handles 105a and 105b Pressure reducing valve discharge pressure Total d ... gap

Claims (5)

A board portion on which the LEDs are arranged,
A case body on which the board unit is mounted so that the board surface on the side where the LEDs are provided is covered;
Has,
Side walls of a certain height are formed on the ceiling surface of the case body,
A light emitting display device, wherein a sealing member is provided between the side wall and an outer edge of the substrate portion.   The light emitting display device according to claim 1, wherein the substrate portion is a single-sided mounting substrate on which a conductive portion is disposed on one surface. The light-emitting display device according to claim 1, wherein a sheet for protecting a surface is attached to the case body.   An air compressor comprising the light-emitting display device according to any one of claims 1 to 3. The light emitting display device,
A display unit using the LED;
A power button to drive the air compressor,
A mode switching button for switching the driving mode,
The air compressor according to claim 4, further comprising: a lighting lamp indicating a set drive mode.

Images