JP2012068386A - Bar graph display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bar graph display device that is comfortable to watch.SOLUTION: A bar graph display device in which a plurality of light emitting units 21 are arranged in a row and successively lit according to a measured quantity comprises a case body 22 disposed so as to surround the light emitting units 21 and an optical member 23 that is made of a transmissive material and covers the case body 22 from above and on whose surface a convexo-concave part 24 made up of a plurality of minute fine parallel lines along the row of the light emitting units 21. Since irradiating rays from the light emitting units 21 entering from behind the optical member 23 are emitted each in a visual line direction from the convexo-concave part 24 made up of a plurality of minute fine parallel lines formed on the surface of the optical member 23, brilliance of the convexo-concave part 24 made up of a plurality of minute fine parallel lines disposed in a direction orthogonal to the light emitting units 21 arranged in a row achieves visibility of refracted light guided in a narrow area and in a belt shape, resulting in a fine-looking bar graph display device.

Description

  The present invention relates to a display device in which a display device such as an indicating instrument mounted on a vehicle such as an automobile, a motorcycle, a construction machine, or an agricultural machine is housed in a case body. The present invention relates to a display device configured to display a bar graph.

  As a display device mounted on a conventional vehicle or the like, a speedometer that displays the traveling speed of the vehicle, an engine tachometer that displays the engine speed, a fuel meter that displays the remaining amount of fuel in the vehicle, and a temperature of engine cooling water in the vehicle An indicator such as a water temperature gauge is displayed.

  In these indicator instruments for vehicles, the display format is generally adjusted along the scale on the dial according to the displacement of the vehicle speed, engine rotation instructions, fuel remaining amount, and the like. A display device (analog display device) composed of a pointer-type indicating instrument (analog indicating instrument) for instructing movement is generally known.

  In addition, with the advancement and diversification of automobiles and the like, not only the analog display instrument (analog display device) described above as a display format but also a digital display display instrument (7-segment display etc.) A digital display device) or an indicator (bar graph display device) that displays a zone display or a bar graph by a large number of segments arranged in parallel is employed.

  Specifically, when displaying the engine speed in a bar graph, a numerical value representing the engine speed is given on the dial, and a number of segments are arranged so as to match the numerical value so as to emit light as a bar graph. It is configured to be able to.

  As a display element constituting such a display unit, it can be formed by a display such as a liquid crystal display element, but a bar graph using a light emitting diode can be displayed brightly in color display. Various display devices using display have been proposed. (See Patent Document 1)

  In addition, the control of the light emission display by the light emitting diode is performed by, for example, processing the signal from the rotation sensor for detecting the engine rotation by the microcomputer and lighting the corresponding segment (light emitting diode) by the obtained data. The number of revolutions is displayed.

  In such a display device that displays the amount of change in the state of the vehicle in a bar graph, even if it is a case where responsiveness is required to increase and decrease rapidly, such as engine rotation, the display There is an advantage in that it can be immediately discriminated by the bar graph display in accordance with the increase or decrease of the change amount to be changed. In addition, since the overall liquid level can be well distinguished by displaying the bar graph so as to match the level level of the liquid level tank, such as the remaining amount of fuel, the display format of the bar graph Suitable as a display device to represent.

JP-A-1-154195 JP-A-9-39609

  By the way, the amount of change displayed on the bar graph is lighted in accordance with the size of the light emitting diode in a type (refer to Patent Document 1) in which a light emitting diode consisting of a large number of segments is directly turned on / off. Since it is illuminated, it is illuminated and displayed in a strip shape with a relatively small size.

  For this reason, in a bar graph display type display device using light emitting diodes that are lit and displayed in a strip shape, vertical dimension portions that substantially match the size of the light emitting portion of the light emitting diodes (vertical width dimension) are in a state of being lit. Therefore, light emission is displayed in a narrow state in the vertical direction. Thereby, since the display part by a bar graph seems to shine in strip | belt shape in a narrow area | region, there exists a problem that the light emission part location will be in the state which is hard to visually recognize.

  In this respect, for example, as described in Patent Document 2, a diffusing radiation lens (light guide member) is arranged to face each of the light emitting diodes continuously arranged in an arc shape on the circuit board. A resin sheet is disposed on the front side of the diffusing radiation lens by receiving the irradiation light into the diffusing radiation lens.

  In this case, in the display device described in the above-mentioned Patent Document 2, since the irradiation light from the light emitting diode is illuminated and displayed through the diffusion radiation lens as the light guide member, the diffusion radiation lens corresponding to the light emitting diode is used. Then, the surface portion located on the front side is illuminated, and at this time, the surface portion of the diffusing radiation lens is divided into strip-shaped blocks (segments) having a predetermined length arranged in an arc shape. Each bar is displayed with illumination, and a bar graph is displayed with a predetermined width of the band-like block. Since the bar graph is displayed over a wide area, it is possible to provide an easy-to-see bar graph display. There are benefits.

  However, since the diffused radiation lenses are arranged in strips along the light emitting diodes, there is a problem that the cost of parts is increased and the assembling work efficiency of this type of display device tends to be lowered. .

  Therefore, the present invention focuses on the above-mentioned problems, and an object thereof is to provide a bar graph display device that can reduce the cost and can improve the assembling work efficiency of the display device as compared with the conventional one, and is easy to see.

  In order to solve the above-described problems, the present invention provides a bar graph display device in which a plurality of light emitting units are arranged in a row and each light emitting unit is sequentially turned on according to a measurement amount so as to surround the light emitting units. An optical member made of a transparent material that covers the case body and has a plurality of fine parallel lines formed on the surface thereof along the rows of the light emitting parts, It is a bar graph display device characterized by comprising.

  With this configuration, the irradiation light from the light-emitting unit that is a light source is incident from the back side of the optical member, and the line-of-sight is formed from the plurality of fine parallel lines formed on the surface of the optical member. Since the light is emitted in the direction, the result is a narrow area and a band-like shape as a result of the concavo-convex parts consisting of a plurality of fine parallel lines provided in a direction orthogonal to the light emitting parts arranged in a row shine. The light is refracted and guided to be visible. That is, only the light that is refracted and guided toward the line of sight from the light emitting portion through the inside of the optical member can be seen at the portion that shines in a band shape, which is formed on the surface of the optical member with the light emitting portion as a reference. Dimensions of the light emitting part (vertical and horizontal dimensions) that appear in a line parallel to the arrangement direction of the light emitting parts and that a plurality of fine irregularities appear to shine with a predetermined width (width reaching the line of sight) and are emitted from the light emitting part. On the other hand, by increasing the vertical dimension of the concave and convex portion made of a plurality of fine parallel lines formed on the surface of the optical member, the irradiation light incident on the optical member can be made into a plurality of fine parallel rays. Each concavo-convex part shines and appears to shine in a band shape by being led through the line-shaped concavo-convex part while being refracted, and as a result, the size of the concavo-convex part that appears to be a band shape The dimensions of the light emitting part Since it looks elongated and large, the optical member can be molded integrally without securing the visibility and separately forming the light guide member as in the prior art, and the component cost can be reduced. There is an effect that the assembly work efficiency can be increased as compared with the conventional one.

  According to a second aspect of the present invention, in the bar graph display device according to the first aspect of the present invention, substantially half along the direction orthogonal to the plurality of light emitting units arranged in a row on the back surface of the optical member facing the light emitting unit. A convex lens portion having a circular convex shape is provided.

  By configuring in this way, the light from the light emitting part is made substantially parallel from the depth direction of the optical member to the front surface side at the convex lens part made of a semicircular convex shape provided at the back surface portion of the optical member. Since light can be introduced into the optical member, it is possible to prevent the light from diffusing in the optical member, and toward the concave and convex portions made of a plurality of fine parallel lines provided on the surface side of the optical member. Since each can guide light, it is possible to provide a bar graph display device having a good appearance, capable of shining the uneven portions made of fine parallel lines provided on the optical member while suppressing luminance unevenness. It is.

  In the present invention, in a bar graph display device in which a plurality of light emitting units are arranged in a row and each light emitting unit is sequentially turned on according to a measurement amount, a case body provided so as to surround the light emitting unit, and the case body A bar graph display device comprising: an optical member that covers and has a transparent material on a surface of which a plurality of fine parallel line-shaped concavo-convex portions are formed along the rows of the light emitting portions. Therefore, the irradiation light from the light emitting part which is a light source is incident from the back side of the optical member, and is directed toward the line-of-sight direction from the plurality of fine parallel lines formed on the surface of the optical member. As a result, the concavo-convex portions made up of a plurality of fine parallel lines provided in a direction orthogonal to the light emitting portions arranged in a row are shining so that the light is refracted in a narrow region and in a band shape. Being visible It can be, which can provide a good bar graph display device of appearance, thereby making it possible to achieve the intended purpose.

FIG. 1 is a front view showing a bar graph display device according to a first embodiment of the present invention. FIG. 2 is a front view of a main part formed by cutting out a part of FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a schematic cross-sectional view showing the bar graph display device of FIG. FIG. 5 is a perspective view showing a main part of FIG. FIG. 6 is a schematic cross-sectional view showing the main part of the bar graph display device according to the second embodiment of the present invention.

  As a bar graph display device which is an object of the present invention, an indicator instrument mounted on a motorcycle will be described in detail as an example.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 to FIG. 5 show a first embodiment of the present invention, and display various travel information such as a motorcycle speed, a travel distance, and a fuel gauge, for example, as an indicating instrument (display device) mounted on a motorcycle or the like. The first display D1, the second display D2 for instructing the engine rotation of the vehicle, the circuit board 3 disposed behind the displays D1 and D2, and the back side of the circuit board 3 are covered. A lower case 4 formed of a back cover and an upper case 5 provided with a see-through cover 5A capable of visually recognizing at least the display area of the displays D1 and D2.

  The first display D1 includes a display including a liquid crystal display panel 11 that digitally displays various travel information using 7-segment numerals, and the second display together with the first display D1. The display D2 is arranged on the circuit board 3.

  The second display D2 displays a predetermined area in a zone display or a bar graph by sequentially lighting and displaying segments composed of light emitting diodes, which will be described later, which are light emitting sections 21 in which a number of vehicle engine rotations are arranged in parallel. A bar graph display device is housed in the upper and lower cases 4 and 5.

  On the circuit board 3, a drive circuit (not shown) for driving the respective displays D1 and D2 is mounted, and the liquid crystal display panel 11 is placed behind the liquid crystal display panel 11 which is the first display D1. A light source 12 (light emitting diode) for transmitting illumination is disposed. Further, a light emitting unit 21 made of light emitting diodes arranged in a parallel state constituting a part of the second display D2 is mounted on the circuit board 3.

  By the way, in this embodiment, as 2nd display device D2, as above-mentioned, the light emission part 21 which consists of a several light emitting diode on the circuit board 3 is long along the physical quantity which consists of engine rotation, or the increase / decrease direction of a measuring object. In this way, a plurality of light emitting units 21 each composed of light emitting diodes are provided so as to be sequentially turned on in accordance with the measurement amount.

  A frame-shaped case body 22 made of a white synthetic resin is disposed on the circuit board 3 so as to surround the light emitting units 21 arranged in a row. In this embodiment, a holding frame 22 </ b> A that holds the liquid crystal display panel 11 that is the first display D <b> 1 using a part of the frame-shaped case body 22 is provided.

  An optical member 23 made of a transparent material made of synthetic resin is disposed on the upper surface side of the frame-shaped case body 22 along the region of the light emitting portion 21 made of a light emitting diode.

  The surface of the optical member 23 has a sawtooth shape which is a concavo-convex portion composed of a plurality of fine parallel lines in which the cross section, that is, the cross-sectional shape in a direction intersecting the longitudinal arrangement direction of the light emitting portions 21 is a triangular shape. A convex portion 24 is formed. In other words, on the surface of the optical member 23, a plurality of concave and convex portions (sawtooth convex portions) 24 formed of a plurality of fine parallel lines are formed along the row of light emitting diodes that are the light emitting portions 21. Yes.

  In this embodiment, the serrated convex portions 24 that are the concave and convex portions formed of two parallel lines are arranged at intervals of about 1 mm. In some cases, the gaps may be narrowed and formed as finer concave and convex portions (sawtooth convex portions) 24 having parallel lines. At this time, each ridge line and each of the serrated convex portions 24 may be formed. The valley lines extend so as to be parallel (equal intervals).

  A convex lens portion 25 having a substantially semicircular convex shape is integrally provided on the back surface of the optical member 23 facing the light emitting portion 21 along a direction orthogonal to the plurality of light emitting portions 21 arranged in a row. .

  A display window is provided on the surface side of the first and second displays D1 and D2 so as to cover the periphery of the display area of the liquid crystal display panel 11 that is each of the displays D1 and D2 and the periphery of the optical member 23. A display board 6 provided with a frame 6A is arranged, and in this embodiment, the display board 6 is assembled and held in a frame-like case body 22. At this time, an indicator portion 6B such as a display unit (× 1000 / min), a rotational numerical value (number) or a scale indicating the rotational speed of the engine rotation is formed on the surface of the display board 6 by means such as printing.

  As described above, according to the first embodiment, a plurality of light emitting units (light emitting diodes) 21 are arranged in a row on the circuit board 3, and the light emitting units (light emitting diodes) 21 are sequentially turned on according to the measurement amount. In the bar graph display device to be made, a frame-like case body 22 provided so as to surround the light-emitting portions (light-emitting diodes) 21, and the case body 22 is covered and the light-emitting portions (light-emitting diodes) 21 are arranged on the surface of the case body 22. And an optical member 23 made of a transparent material having a plurality of fine parallel line-shaped concavo-convex portions (saw-toothed convex portions) 24 formed thereon. Irradiated light from the portion (light emitting diode) 21 is incident from the back side of the optical member 23, and from a plurality of uneven portions (saw-toothed convex portions) 24 formed on the surface of the optical member 23, which are formed of a plurality of fine parallel lines. View each Since the light is emitted in the direction, as a result, a plurality of fine uneven lines (saw-toothed convex portions) 24 provided in a direction orthogonal to the light emitting portions (light emitting diodes) 21 arranged in a row. By shining, a bar graph display device having a good appearance can be visually recognized by being refracted and guided in a band shape along a direction that intersects (orthogonally) the increase / decrease direction in a narrow area along the increase / decrease direction. Can be provided.

  Specifically, when the engine speed is displayed in a bar graph, the light emission display 21 is controlled by the light emitting unit 21 formed of a light emitting diode. For example, a signal from a rotation sensor that detects engine rotation is calculated by a microcomputer, The engine speed is displayed by turning on the light-emitting diode corresponding to the light-emitting unit 21 based on the obtained data.

  That is, only the light that is refracted and guided in the direction of the line of sight from the light emitting part (light emitting diode) 21 in the lighting state through the medium of the optical member 23 can be seen in the portion that shines in a band shape according to the engine speed. In this case, the dark area in the bar graph of FIG. 1 represents the engine rotation.

  This is a lighting in which a plurality of fine concave and convex portions (saw-like convex portions) 24 in a parallel line located directly above the light emitting portion 21 in a lighting state are continuously arranged at a predetermined interval. Since only the width dimension (predetermined width) of the light-emitting portion 21 (light-emitting diode) in the state appears to shine as a width that directly reaches in the line-of-sight direction, it appears to be sequentially lit in a bar graph at predetermined intervals. (See Figure 1)

  At this time, the light emitting portion (light emitting diode) 21 irradiated from the light emitting portion (light emitting diode) 21 has a plurality of fine parallel lines formed on the surface of the optical member 23 with respect to the dimensions (vertical and horizontal dimensions). Since the vertical width dimension (the vertical dimension of the sawtooth convex portion 24 in FIG. 1) of the uneven portion (sawtooth convex portion) 24 is formed large, each of the irradiation light beams that enter the optical member 23 causes each of A plurality of concave and convex portions (sawtooth convex portions) 24 formed of a plurality of fine parallel lines shine. A part of the irradiation light beam guided to the concavo-convex portion 24 is derived while being guided by refraction in the line-of-sight direction, so that it appears in a vertically long state and shines in a band shape.

  As a result, the size of the uneven portion (saw-toothed convex portion) 24 that looks like a band appears to be elongated and larger in the vertical direction than the dimension of the light emitting portion (light emitting diode) 21, so that the visibility is ensured and the conventional manner is achieved. The optical member 23 can be integrally formed without dividing the optical member, and the cost of parts can be reduced. The effect of increasing the assembling work efficiency of the display device can be improved. is there.

  In the present embodiment, light is incident on the optical member 23 positioned right above the light emitting unit 21 by the light emitting unit (light emitting diode) 21 that emits light according to the number of rotations. Since a convex lens portion 25 having a substantially semicircular convex shape is integrally provided on the back surface along a direction orthogonal to the plurality of light emitting portions 21 arranged in a row, the convex lens portion 25 is provided as shown in FIG. Thus, it becomes possible to introduce light so as to be substantially parallel from the depth direction of the optical member 23 toward the front surface side. For this reason, it is possible to prevent the light from diffusing in the optical member 23 and optically. Since light can be respectively guided toward the uneven portions (sawtooth convex portions) 24 having a plurality of fine parallel lines provided on the surface side of the member 23, the light is provided on the optical member 23 while suppressing luminance unevenness. Fine flat It can illuminate brightly the uneven portion (sawtooth protrusions) 24 formed of a linear.

  FIG. 6 shows a second embodiment of the present invention. Here, the shape of the concavo-convex portion 24 formed of a sawtooth convex portion formed on the surface of the optical member 23 shown in the first embodiment is changed. Thus, the concave / convex portion 24A having a semi-cylindrical cross section is integrally formed on the surface of the optical member 23 as the concave / convex portions made of a plurality of fine parallel lines.

  By configuring in this way, a plurality of minute uneven portions 24A having a kamaboko shape formed of parallel lines and positioned immediately above the light emitting unit 21 in the lit state in substantially the same manner as in the first embodiment described above. However, since only the width dimension (predetermined width) of the light emitting units 21 (light emitting diodes) in the lighting state arranged continuously with a predetermined interval appears to shine as a width that reaches directly in the line-of-sight direction, It seems to light up sequentially in the form of a bar graph at intervals.

  At this time, with respect to the dimension (vertical and horizontal dimensions) of the light emitting part (light emitting diode) 21 irradiated from the light emitting part (light emitting diode) 21, a plurality of fine parallel lines having a kamaboko shape formed on the surface of the optical member 23. Since the vertical dimension of the concavo-convex part 24A is formed large, the concavo-convex part (concavo-convex part having a kamaboko shape) formed of a plurality of fine parallel lines by the irradiation light incident on the optical member 23 is formed. 24A shines. A part of the irradiated light beam guided to the uneven portion 24A is guided while being refracted and guided in the line-of-sight direction, so that it appears in a vertically long state and shines in a band shape.

  As a result, the size of the uneven portion (the uneven portion having a kamaboko shape) 24 that looks like a band appears to be longer than the size of the light emitting portion (light emitting diode) 21 in the vertical direction. The optical member 23 can be integrally formed without splitting the light guide member, and the component cost can be reduced, and the assembly work efficiency of the display device can be increased as compared with the conventional case. effective.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in each embodiment, the rotation of an engine such as a vehicle is used as a bar graph display device. Although an example of bar graph display or zone display has been described, a bar graph display device that displays various information such as a speedometer, a fuel gauge, and a water temperature gauge may be used. The illumination color is not limited to the same color, and a predetermined area may be switched to an alarm color, an eco display color, or the like. The height, spacing, shape, etc. of the convex portions of the concavo-convex portions 24, 24A made of a plurality of fine parallel lines can be deformed. Although it was a serrated convex part as an uneven part made of parallel lines, or an uneven part made of a kamaboko shape, it can also obtain a crying effect in the reverse kamaboko shape, The shape, thickness, and the like of the convex lens portion 25 having a substantially semicircular convex shape provided on the back surface of the optical member 23 may be appropriately set.

  Further, as described in detail in the above-described embodiment, the display device in the automobile has been described as an example. However, the present invention is not limited to the vehicle, but is applied to a bar meter display device such as a marine instrument or an agricultural machine or a construction machine. The same effect can be obtained.

D1 1st display D2 2nd display 3 Circuit board 4 Lower case 5 Upper case 5A Perspective cover 6 Display board 6A Display window frame 6B Indicator part 11 Liquid crystal display panel 12 Light source (light emitting diode)
21 Light Emitting Unit (Light Emitting Diode)
22 Case body 23 Optical member 24 Concavity and convexity (sawtooth convex part)
24A Concavity and convexity (concave and convex part consisting of kamaboko shape)
25 Convex lens

Claims (2)

  In a bar graph display device in which a plurality of light emitting units are arranged in a row and each light emitting unit is sequentially turned on according to a measurement amount, a case body provided so as to surround the light emitting unit, and a surface of the case body that covers the case body A bar graph display device comprising: an optical member made of a transparent material having a plurality of concave and convex portions formed of fine parallel lines along the row shape of the light emitting portions. A convex lens portion having a substantially semicircular convex shape is provided on a back surface of the optical member facing the light emitting portion along a direction orthogonal to the plurality of light emitting portions arranged in a row. Item 2. The bar graph display device according to Item 1.

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