JP4467386B2 - Internal illumination display device and clock device - Google Patents

Description

  The present invention relates to an internally illuminated display device that illuminates a display plate with a light source provided therein, and a timepiece device.

  Some devices that display letters and numbers include an internally illuminated display device (see, for example, Patent Document 1). In this internally illuminated display device, a light source for illumination is provided on the inner side with respect to the display plate with characters or the like on the outer surface, and the surface of the display plate facing outward from the back side of the display plate by this light source is provided. It is illuminated so that characters on the display board can be visually recognized.

Further, in the display device disclosed in Patent Document 1, two display plates are provided, and the surface of the display plate is covered from the back side of the display plate by a fluorescent lamp provided inside the display plate. It is designed to illuminate. Further, in the display device disclosed in Patent Document 1, in order to illuminate the two display boards more evenly, two fluorescent lamps are arranged as light sources, and a plurality of sheets stacked between the display boards and the light sources are further provided. A light diffusing film is provided, and the outer shape of the light diffusing film is reduced as it approaches the light source.
Japanese Utility Model Publication No. 5-45778

  However, when a fluorescent lamp is used as a light source as in the device disclosed in Patent Document 1, a large amount of space is required for arranging the light source and the light diffusion film, and power consumption for operating the light source is low. Increase. Further, when two display boards are provided, it is necessary to arrange a light source so that these display boards are illuminated uniformly.

  Therefore, an object of the present invention is to illuminate two display boards evenly while making the light source more compact in an internally illuminated display device or the like having two display boards.

In order to solve the above problems, the internally illuminated display device according to the first aspect of the present invention has translucency, characters or numbers are displayed on the surface, and each surface is a front surface of the housing. orientation backside, and a pair of display plates, each of the back surface disposed opposite to each other oriented parallel,
A plurality of light emitting diodes and a light source substrate disposed in parallel with the pair of display plates between the pair of display plates in the center of the housing ;
The light emitted from the light emitting diode is incident from the back surface of the display plate to illuminate the surface of the display plate,
The light emitting diode has a lamp portion positioned outside the peripheral end portion of the light source substrate, and a front end of the lamp portion extends straight outward from the peripheral end portion of the light source substrate along the light source substrate. Is arranged to face the
The light emitting diode has a directivity with the strongest brightness in a straight direction along the longitudinal direction of the lamp portion from the tip of the lamp portion, and light from the light emitting diode is reflected by a side surface inside the casing. And illuminating the pair of display panels .

  According to the present invention, since the light emitting diode is used as the light source, the light source can be made compact. Since the light emitting diode is provided so that the lamp portion is located outside the peripheral end portion of the light source substrate, the light emitted from the lamp portion is not blocked by the light source substrate in each direction of the pair of display plates. Can lead. Thereby, when illuminating each of a pair of display board with a light emitting diode, illumination efficiency can be improved. Further, both of the pair of display panels can be illuminated more evenly.

The light emitting diodes are disposed such that the direction in which the tip of the ramp portion extends straight outwards along the light source substrate from the peripheral end portion of the light source substrate. Thereby, both of the pair of display panels can be illuminated more uniformly without biasing the light emitted from the light emitting diodes to one of the pair of display panels.
Further, since the light emitting diode has the directivity having the strongest brightness in the straight direction along the longitudinal direction of the lamp portion from the tip of the lamp portion, both the pair of display panels are illuminated more evenly. can do.

  In addition, the plurality of light emitting diodes can be radially arranged at equal intervals on the light source substrate. Thereby, the uniformity of the illumination as a light source can be given. Thereby, each of a pair of display board can be illuminated more uniformly, and it can make a display easy to see.

  In addition, the light source substrate can be disposed at a substantially middle position between the pair of display panels. Thereby, both of a pair of display boards can be illuminated more uniformly.

In addition, a diffuse reflection layer can be formed on the back surface of the display panel. As a result, among the light incident on the back surface of the display panel, the light that has not entered the display panel can be diffusely reflected. Thereby, when illuminating the surface of a display board, it can illuminate more uniformly.
In addition, a frame body can be provided corresponding to the position of the peripheral end portions of the pair of display panels, and a diffuse reflection layer can be formed on the inner surface of the frame body facing the light emitting diode. Thereby, the light of the light emitting diode can be diffused and reflected once on the inner surface of the frame and incident on the back surface of the display plate, so that the surface of the display plate can be illuminated more uniformly.

In addition, a timepiece device according to a second aspect of the present invention includes any one of the internally illuminated display devices in which the letters or numbers represent time.
Provided on one surface side of the pair of display panels, each provided with one short hand and one long hand for indicating the time by indicating the numeral, and the other surface side of the pair of display panels, Includes another short hand and another long hand for indicating the time by indicating the numeral, and a timepiece movement means for rotationally driving the short hand and the long hand.

  According to the timepiece device of the present invention, it is possible to illuminate both of the pair of display boards more evenly and make it easier to see the time display.

  According to the present invention, since the light emitting diode is used as the light source, the light source can be made compact. And when illuminating a display board with a light emitting diode, illumination efficiency can be improved. Further, both of the pair of display panels can be illuminated more evenly. Thereby, it can be made easy to see the display about any of a pair of display boards. In addition, since the pair of display panels is illuminated by one light source substrate provided with light emitting diodes, power consumption can be suppressed as a whole. In addition, since the illumination efficiency is good, the value of current flowing through each light emitting diode can be reduced, the life of each light emitting diode can be extended, and the display panel can be illuminated uniformly and brightly for a long period of time.

  An embodiment of the present invention will be described with reference to FIGS. An internal display device according to an embodiment of the present invention is applied to a timepiece device 30 according to an embodiment of the present invention. FIG. 1 is a front view illustrating a state in which the timepiece device 30 is viewed from the front direction. FIG. 2 is a side view illustrating a state in which the timepiece device 30 is viewed from the right side.

  As shown in FIGS. 1 and 2, the timepiece device 30 includes a timepiece unit 25 and a support column unit 26. The strut part 26 fixes and supports the timepiece part 25. The column part 26 is disposed along the vertical direction perpendicular to the ground G.

  The support portion 26 has a watch portion 25 attached to the upper end thereof, and supports the watch portion 25 from below. The lower part of the column part 26 is buried in the ground and fixed in the ground. The column portion 26 is embedded in the ground with a constant dimension along the longitudinal direction of the lower portion of the column portion 26 so that the column portion 26 is stably supported on the ground. Thereby, the support | pillar part 26 can support the timepiece part 25 attached to an upper end stably. Further, a solar cell 28 is provided on the upper portion of the clock unit 25 via a support unit 27, and a battery (not shown) as a power source of the clock unit 25 is charged.

  The clock unit 25 is provided with two clock panels for informing time, and a clock panel on the front side and a clock panel on the back side are provided. The timepiece on the front side is provided so that the time can be visually observed when the timepiece device 30 is viewed from the front direction as indicated by D1 in FIGS. On the other hand, as shown by D2 in FIG. 2, the timepiece on the back side is provided so that the time can be seen by looking at the timepiece device 30 from the backside.

  Next, the clock unit 25 will be described with reference to FIG. FIG. 3 shows the clock unit 25 in detail. FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 and includes a partial cross-section in a state in which the inside of the timepiece unit 25 is viewed from the left side.

  The timepiece unit 25 described below includes a first long hand 15, a first short hand 16, a second long hand 17, a second short hand 18, a first timepiece movement 19, and a second timepiece movement 20. Has been designed to function as a watch. When a member for functioning as a timepiece is removed from the timepiece unit 25, an embodiment of an internally illuminated display device according to the present invention can be implemented.

  As shown in FIG. 3, the clock unit 25 includes the first glass plate 11, the second glass plate 12, the outer frame 21, the first display plate 1, the second display plate 2, One long hand 15, first short hand 16, second long hand 17, second short hand 18, first timepiece movement 19, second timepiece movement 20, light source unit 7, and light source unit And an attachment plate 8.

  The timepiece on the front side includes a first glass plate 11, a first long hand 15, a first short hand 16, and a first timepiece movement 19. The timepiece on the back side includes a second glass plate 12, a second long hand 17, a second short hand 18, and a second timepiece movement 20. The light source unit 7 is shared by the front clock board and the back clock board.

  The outer frame 21 is configured by assembling a plurality of frames, and supports each member of the timepiece unit 25 from the outside. The outer frame 21 forms a frame and is provided in correspondence with the position of the peripheral end of the first display panel 1 and the position of the peripheral end of the second display panel 2. The outer frame 21 is attached to and supported by the column portion 26.

  A first glass plate 11 is attached to the front side end of the outer frame 21. A second glass plate 12 is attached to an end on the back side of the outer frame 21.

  The first glass plate 11 is formed of a transparent glass material, and the inside can be visually observed from the first glass plate 11. The second glass plate 12 is formed of a transparent glass material, and the inside of the second glass plate 12 can be visually observed. Instead of the glass plates 11 and 12, a transparent resin plate such as polycarbonate may be used.

  A first display plate 1 is provided on the inner side with respect to the first glass plate 11. On the surface of the first display plate 1, numbers and the like for indicating the time are displayed in combination with the first long hand 15 and the first short hand 16. The first long hand 15 and the first short hand 16 are provided so as to be located in a space between the first glass plate 11 and the first display plate 1.

  The first long hand 15 and the first short hand 16 are driven by a first timepiece movement 19 provided on the back side of the first display panel 1. A first rotating shaft portion 23 connected to the driving shaft of the first timepiece movement 19 is provided through the first display plate 1, and the driving force of the first timepiece movement 19 is the first rotation. It is transmitted to the first long hand 15 and the first short hand 16 by a rotation shaft corresponding to each needle of the shaft portion 23. Further, the timepiece movement 19 is connected to the first display plate 1 via a cylindrical support member 23 a provided around the first rotation shaft portion 23.

  The first rotating shaft portion 23 is provided with a rotating shaft corresponding to the first long hand 15 and a rotating shaft corresponding to the first short hand 16. These rotating shafts are driven by gears having different gear ratios by the driving shaft of the first timepiece movement 19. Thereby, the 1st long hand 15 and the 1st short hand 16 rotate with a different rotational speed with each rotating shaft.

  A second display plate 2 is provided inside the second glass plate 12. On the surface of the second display plate 2, numbers and the like for displaying time are displayed in combination with the second long hand 17 and the second short hand 18. The second long hand 17 and the second short hand 18 are provided between the second glass plate 12 and the second display plate 2.

  The second long hand 17 and the second short hand 18 are driven by a second timepiece movement 20 provided on the back side of the second display panel 2. A second rotating shaft portion 24 connected to the driving shaft of the second timepiece movement 20 is provided through the second display plate 2, and the driving force of the second timepiece movement 20 is the second rotation. It is transmitted to the second long hand 17 and the second short hand 18 by a rotation shaft corresponding to each needle of the shaft portion 24. The second timepiece movement 20 is connected to the second display plate 2 via a cylindrical support member 24 a provided around the second rotating shaft portion 24.

  The second rotating shaft portion 24 is provided with a rotating shaft corresponding to the second long hand 17 and a rotating shaft corresponding to the second short hand 18. These rotating shafts are driven by gears having different gear ratios by the driving shaft of the second timepiece movement 20. Thereby, the 2nd long hand 17 and the 2nd short hand 18 rotate with a different rotational speed in each rotating shaft.

  The first display panel 1 and the second display panel 2 are arranged so as to be parallel to each other, and are arranged so that the respective back surfaces 1b and 2b face each other. The first display panel 1 and the second display panel 2 are formed of a material having translucency with respect to the light of the light emitting diode 6. Moreover, the 1st display board 1 and the 2nd display board 2 consist of milky white acrylic resin called milky white acryl, and the back surface 1b of the 1st display board 1 and the back surface 2b of the 2nd display board 2 are as follows. A diffuse reflection layer is formed.

  Note that a light diffusing substance such as calcium carbonate, silica, titanium oxide or the like may be applied, or a satin finish may be applied to further enhance the function as a diffuse reflection layer. Moreover, the diffuse reflection layer is formed by painting the part into which the light radiated | emitted from the light emitting diode 6 in the inner surface of the outer side frame 21 may inject. At this time, as the coating material, a material mixed with the above-described light diffusing substance is preferable.

  The diffuse reflection layer diffuses and reflects the light emitted from the light emitting diode 6 that is not directly incident on the display plates 1 and 2 to illuminate the surfaces 1a and 2a of the display plates 1 and 2 more uniformly. can do.

  A light source unit 7 is provided between the first display panel 1 and the second display panel 2. The light source unit 7 is connected to the outer frame 21 via the light source unit mounting plate 8. The light source unit mounting plate 8 is provided so as to bridge between the mounting portion 21a of the outer frame 21 and the column portion 26 and the mounting portion 21b provided on the opposite side in the longitudinal direction. The short direction is narrower than the light source substrate 5 described later. The attachment portion 21a is a cylindrical member, and the support portion 26 inserted through the opening of the outer frame 21 (not shown) is fitted into the attachment portion 21a.

  The light source unit 7 includes a number of light emitting diodes 6 and a light source substrate 5 to which the light emitting diodes 6 are attached. As the light emitting diode 6, it is preferable to use a white LED (Light Emitting Diode). The light source board 5 is a control board for controlling the light emitting diode 6, and a circuit for operating the light emitting diode 6 is provided. As indicated by the straight line B, the light source substrate 5 is provided so that the light emitting diode 6 is positioned approximately in the middle between the first display panel 1 and the second display panel 2. The light source substrate 5 is connected to the light source unit mounting plate 8 by a support member 8a.

  The light emitted from the light emitting diode 6 is reflected by the inner surface of the outer frame 21 facing the light emitting diode 6 and is incident on the back surface 1 b of the first display panel 1. Among them, a part of the light incident on the back surface 1 b of the first display panel 1 enters the first display panel 1 and illuminates the surface 1 a of the first display panel 1. Of the light that has entered the back surface 1 b of the first display panel 1, the light that has not entered the display panel 1 is reflected, and then part of the light enters the back surface 1 b of the display panel 1 again and enters the display panel 1. Incident.

  The light emitted from the light emitting diode 6 is reflected by the inner surface of the outer frame 21 facing the light emitting diode 6 and is incident on the back surface 2 b of the second display panel 2. Among them, a part of the light incident on the back surface 2 b of the second display panel 2 enters the second display panel 2 and illuminates the surface 2 a of the second display panel 2. Of the light that has entered the back surface 2 b of the second display panel 2, the light that has not entered the display panel 2 is reflected, and then part of the light enters the back surface 2 b of the display panel 2 again and enters the display panel 2. Incident.

  When the clock unit 25 described above is viewed from the front, the surface of the inner first long hand 15, the first short hand 16, and the first display plate 1 can be viewed through the first glass plate 11. it can. Thereby, time can be known.

  Further, when the timepiece unit 25 is viewed from the back side, the inner surface of the second long hand 17, the second short hand 18, and the second display plate 2 can be visually observed through the second glass plate 12. Thereby, time can be known.

  Next, the light source substrate 5 and the light emitting diode 6 will be described in more detail with reference to FIGS. FIG. 4 is a plan view showing a state in which the light source substrate 5 and the light emitting diode 6 are viewed from vertically above the light source substrate 5 with respect to the substrate plane. As shown in FIG. 4, the light source substrate 5 is a substrate having a substantially circular shape centered on C.

  As shown in FIG. 4, a large number of light emitting diodes 6 are attached to the light source substrate 5. The light emitting diodes 6 are arranged radially about the center C of the substrate 5. The light emitting diodes 6 are arranged at substantially equal intervals along the peripheral end portion 5a of the light source substrate 5, and have uniformity as a light source.

  The light emitting diode 6 is provided such that the lamp portion 6 a is positioned outside the peripheral end portion 5 a of the light source substrate 5. The light emitting diode 6 is arranged so that the tip of the lamp portion 6 a faces a direction extending straight outward from the peripheral end portion 5 a of the light source substrate 5 along the light source substrate 5.

  When the light emitting diode 6 is provided so that the lamp portion 6 a is positioned outside the peripheral end portion 5 a of the light source substrate 5, the light emitted from the lamp portion 6 a is not blocked by the light source substrate 5 and the first display panel 1. And it can guide to the direction of the second display panel 2. Thereby, when illuminating the 1st display board 1 and the 2nd display board 2 with the light emitting diode 6, illumination efficiency can be improved.

  Further, when the light emitting diode 6 is arranged so that the tip of the lamp portion 6 a faces the direction extending straight outward from the peripheral end portion 5 a of the light source substrate 5 along the light source substrate 5, the light emitted from the light emitting diode 6 is emitted. The first display board 1 and the second display board 2 can be illuminated without biasing light to one of the first display board 1 side or the second display board 2 side.

  Next, desirable characteristics of the light emitted from the light emitting diode 6 will be described. FIG. 5 is a graph showing the directivity of light emission for an example of a light emitting diode. With the characteristics shown in FIG. 5, for example, the current supplied to the light emitting diode can be obtained as 20 mA under a temperature condition of 25 ° C.

  In FIG. 5, the horizontal axis corresponds to the radiation angle (Radiation Angle), and the vertical axis corresponds to the relative luminance (Relative Luminosity). From FIG. 5, it can be seen that the light directivity of the light emitting diode shown in this figure has the highest luminance in the direction of the radiation angle of 0 °, and has high directivity in the vicinity of this direction.

  That is, according to the light-emitting diode whose characteristics are shown in FIG. 5, the direction in which the light travels straight along the longitudinal direction of the lamp part from the tip of the lamp part has the strongest directivity, and the neighboring part in this direction is relatively It has high directivity with high brightness.

  As the light emitting diode 6, it is desirable to employ a light emitting diode having directivity shown in FIG. Thereby, when the light emitting diode 6 is arranged so that the tip of the lamp portion 6a faces the direction extending straight outward from the peripheral end portion 5a of the light source substrate 5 along the light source substrate 5, the direction of the light is particularly high. In combination with the characteristics, the first display panel 1 and the second display panel 2 can be illuminated more evenly.

  Next, the behavior of light emitted from the light emitting diode 6 in the clock unit 25 will be described with reference to FIG. As shown in FIG. 6, the light emitted forward from the light emitting diode 6 arranged along the peripheral end portion 5 a of the light source substrate 5 is reflected by the inner surface of the outer frame 21 facing the light emitting diode 6, and the timepiece unit The light is incident on the first display panel 1 and the second display panel 2 while being repeatedly reflected within 25, and the surface of the first display panel 1 and the surface of the second display panel 2 are illuminated.

  According to the embodiment of the present invention described above, since the light emitting diode 6 is used as the light source, the light source can be made compact. Since the light emitting diode 6 is provided so that the lamp portion 6a is located outside the peripheral end portion 5a of the light source substrate 5, the light emitted from the lamp portion 6a is not blocked by the light source substrate 5 and the light emitting diode 6 The light can be reflected from the inner surface of the opposed outer frame 21 and guided toward the first display panel 1 and the second display panel 2. Thereby, when illuminating the 1st display board 1 and the 2nd display board 2 with the light emitting diode 6, illumination efficiency can be improved.

  In addition, when the light emitting diode 6 is provided so that the lamp portion is positioned outside the peripheral end portion 5a of the substrate 5, the first display plate 1 and the second display plate 2 are provided as compared with the case where the light emitting diode 6 is not provided. More even illumination can be achieved.

  Further, when the light emitting diode 6 is arranged so that the tip of the lamp portion 6 a faces the direction extending straight outward from the peripheral end portion 5 a of the light source substrate 5 along the light source substrate 5, the light emitted from the light emitting diode 6 is emitted. The first display board 1 and the second display board 2 can be illuminated without biasing light to one of the first display board 1 side or the second display board 2 side. Thereby, the 1st display board 1 and the 2nd display board 2 can be illuminated more uniformly.

  Further, since the pair of display plates 1 and 2 are illuminated by the single light source substrate 5 provided with the light emitting diodes 6, the power consumption can be suppressed as a whole. Moreover, since the illumination efficiency is good, the luminance of each light emitting diode 6 can be suppressed. In other words, the current value flowing through each light emitting diode 6 can be reduced, and the life of each light emitting diode can be extended. The first display panel 1 and the second display panel 2 can be illuminated brightly for a uniform period. In addition, the light emitting diode 6 has a longer life than a fluorescent lamp, and does not cause a problem of harmful substances such as mercury at the time of disposal unlike a fluorescent lamp. Can be provided.

It is a front view of the timepiece device according to one embodiment of the present invention. It is a side view of a timepiece device. It is sectional drawing of a timepiece part. It is a top view which shows a light source substrate and a light emitting diode. It is a figure which shows the directivity of the light which a light emitting diode radiates | emits. It is a figure which shows the behavior of the light of the light emitting diode in a timepiece part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st display board 1a Front surface of 1st display board 1b Back surface of 1st display board 2 Second display board 2a Front surface of 2nd display board 2b Back surface of 2nd display board 5 Light source board 6 Light emitting diode 7 Light Source Unit 8 Light Source Unit Mounting Plate 11 First Glass Plate 12 Second Glass Plate 15 First Long Hand 16 First Short Hand 17 Second Long Hand 18 Second Short Hand 19 First Clock Movement 20 Second Timepiece movement 21 Outer frame 21a Mounting portion 23 First rotation shaft portion 23a Support member 24 Second rotation shaft portion 24a Support member 25 Clock portion 26 Supporting portion 27 Support portion 28 Solar cell 30 Clock device

Claims (7)

A pair of displays that are translucent, with letters or numbers displayed on the surface, and facing each other so that each surface faces the front and back of the housing and each back faces in parallel The board,
A plurality of light emitting diodes and a light source substrate disposed in parallel with the pair of display plates between the pair of display plates in the center of the housing ;
An internally illuminated display device in which light emitted from the light emitting diode is incident from the back surface of the display plate to illuminate the surface of the display plate,
The light emitting diode has a lamp portion positioned outside the peripheral end portion of the light source substrate, and a front end of the lamp portion extends straight outward from the peripheral end portion of the light source substrate along the light source substrate. Is arranged to face the
The light emitting diode has a directivity with the strongest brightness in a straight direction along the longitudinal direction of the lamp portion from the tip of the lamp portion, and light from the light emitting diode is reflected by a side surface inside the casing. And illuminating the pair of display panels . 2. The internally illuminated display device according to claim 1, wherein the light emitting diode has directivity with a relative luminance of 1 to 0.5 in a radiation angle range of 0 ° to 30 ° .   3. The internally illuminated display device according to claim 1, wherein the plurality of light emitting diodes are radially arranged on the light source substrate at equal intervals. 4.   The internally illuminated display device according to any one of claims 1 to 3, wherein the light source substrate is disposed at a substantially middle position between the pair of display plates. The internally illuminated display device according to any one of claims 1 to 4 , wherein a diffuse reflection layer is formed on a back surface of the display plate. The frame body corresponding to the position of the peripheral edge part of a pair of said display board is provided, The diffused reflection layer was formed in the inner surface of the said frame body facing the said light emitting diode. The internally illuminated display device according to any one of claims 5 to 5 . The internally illuminated display device according to any one of claims 1 to 6 , wherein the letters or numbers are used to represent time.
Provided on one surface side of the pair of display panels, each provided with one short hand and one long hand for indicating the time by indicating the numeral, and the other surface side of the pair of display panels, A timepiece device comprising: another short hand and another long hand for indicating the time by indicating the number, and a timepiece movement means for rotationally driving the short hand and the long hand.

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