JPH0545521U - Display board illuminator - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to variably adjust the emission brightness of the display units of different display colors to a desired state. [Structure] The display plate 4 includes a white light-transmitting display portion 14 and a red light-transmitting display portion 15. The case 2 is provided with a partially cut annular CCT 17 and a hollow cylindrical illumination box 18 inside. The lighting box 18 is a group of LED chips
It becomes a lighting guide for 19. The light rays of the CCT 17 cause the display unit 14 to emit light. The light rays of the LED chip group 19 are displayed on the display unit 15.
Light up. In addition, the LED chip group 19 changes the light emission brightness according to the variable adjustment signal of the brightness adjustment unit 23. [Effect] The display units 14 and 15 are independent light sources for each display color.
Since it is illuminated by 7 and 19, it is possible to adjust the emission brightness according to the display color.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an illuminating device for a display plate, which illuminates the display part of the translucent display plate through transmission.

[0002]

[Prior Art]

 Generally, in vehicle instrument devices installed in automobiles, motorcycles, etc., the scale of the display board and the display part such as numbers are provided so that the driver can visually recognize the displayed value even in dark surroundings such as at night. The pointer and the pointer that is rotating above the display plate are illuminated. The light-emitting display structure of this type of display plate is disclosed in, for example, Japanese Utility Model Publication No. Sho 53-86052, No. 60-170797, No. 62-146920, and the like. Is provided with a light source such as a light emitting diode (LED), a cold cathode tube (CCT), a filament type tungsten bulb (lamp), etc. behind the display plate to scatter the illumination light of this light source or to use acrylic resin. While the light guide plate made of a translucent synthetic resin material is used to guide light, the entire display area in a wide range is illuminated by transmission, so that only the display area shines.

By the way, normally, the display panel of the vehicular instrument device has to be formed with a plurality of display portions such as scales and numbers, and this display portion may have different display colors. For example, on the display plate of an engine tachometer, the scale in the low speed range is displayed in white to indicate a normal state, the scale in the high speed range is displayed in red to indicate a dangerous state, and at least two different display colors are displayed. There will be a display. At this time, in order to make display colors different on the display plate, a white-colored colored translucent ink and a red-colored colored translucent ink are formed by printing on a desired display portion.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, when the display parts of different display colors are transmitted and illuminated by a common light source, the brightness of all the display parts is desired because the transmissivity of each display part and the distance from the light source are different. It was difficult to get into the state.

Further, in the case of simply equalizing the luminance of all the display portions, a structure in which a light control printing layer or a light control filter for reducing the light transmittance by a desired ratio is disposed between the display plate and the light source. Is proposed. However, the desired state of brightness for the driver is not uniform depending on the frequency of visual recognition of the display unit, the importance of the display content, or the display color, due to personal desires and vehicle usage conditions. It is desirable to be able to variably adjust the brightness of each display unit. In the above-mentioned conventional example, all display units are transmitted and illuminated by a common light source, and only a fixed light control device is provided, so a monotonous display state I could only get it.

[0006]

[The purpose of the device]

 The present invention has been conceived by focusing on the problems of the conventional example, and an object thereof is to provide an illuminating device of a display plate capable of adjusting the brightness of a display section of a different display color to a desired state.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a display board illuminating device comprising a display board having a display part having a different display color on a transparent substrate and a light source provided behind the display board. The light sources are independently arranged according to the display colors of the parts.

[0008]

[Action]

 According to the present invention, the brightness of the light source can be independently adjusted in the display units having different display colors.

[0009]

【Example】

 1 to 3 show an engine tachometer of a vehicle instrument device to which an embodiment of the present invention is applied.

The instrument device 1 has a case 2 in which a movement 3 such as a movable wheel type movable magnet type instrument main body (commonly called “bobbin instrument”) is housed and fixed, and a display plate 4 is provided on the front side of the movement 3. An indicator 7 fixed to the indicator shaft 6 of the movement 3 is provided on the front side of the display plate 4 through the through hole 5 of the display plate 4, and a transparent see-through plate is provided in front of the display plate 4. 8 is disposed, and the peripheral edge of the display plate 4 is sandwiched and held between the opaque frame portion 9 of the transparent plate 8 and the case 2.

The display panel 4 has a substrate 10 made of a translucent synthetic resin material such as acrylic or polycarbonate, and a fine concavo-convex diffusion part 11 for uniformizing illumination light is formed on the rear surface of the substrate 10. The first colored transparent layer 12 of a white color is formed by printing on the front surface of the colored transparent layer 12, and the second colored transparent layer 13 of a red color is formed on the front surface of the colored transparent layer 12 in correspondence with the display position of the high rotation area. By printing and forming, a plurality of first display portions 14 such as scales for low and middle rotation areas, numbers and numbers for high rotation areas are left on the front surface of the first colored transmission layer 12, and a second colored transmission layer is formed. A black base color impermeable layer 16 is formed by printing or painting on the front surface of the layer 13 while leaving a second display portion 15 such as a scale in a high rotation area.

On the other hand, inside the case 2, a first light source 17 made of an annular CCT is arranged behind the display portion 14 of the display plate 4, and the light source 17 is interrupted at the lead-out portion of the electrode 17A. A hollow cylindrical lighting box 18 is erected at a space, and a printed circuit board 20 on which light sources 19 composed of a plurality of LED chips are juxtaposed is hooked at an intermediate position in the height direction of the lighting box 18. It is held in a horizontal state by means, and the display portion 15 of the display plate 4 is provided correspondingly at the front opening of the illumination box 18.

On the other hand, on the rear surface of the case 2, a flexible printed wiring board (FPC) 21 for additionally relaying various electric signals transmitted from an external device to the movement 3 inside the case 2 and other devices is additionally provided. The FPC 21 is provided with a tongue portion 22 that is partially deformable independently, and the conductive portion of the tongue portion 22 is soldered to the conductive portion of the printed circuit board 20. Then, on the instrument panel (not shown) of the vehicle, a brightness adjusting section 23 composed of a switch capable of adjusting the voltage of the volume and the like is installed together with the instrument device 1, and the variable adjusting signal of the brightness adjusting section 23 is connected to the signal line 24. It is input to the control circuit section 25 via the control circuit section 25, and the control circuit section 25 generates an electric signal for following and changing the emission brightness of the light source 19 according to the variable adjustment signal, and this signal is generated on the signal line 26, FPC21. Also, the light is transmitted to the light source 19 through the print substrate 20.

Therefore, in the illuminating device of the instrument device 1, when the display plate 4 is provided with the display portions 14 and 15 of different display colors by the two kinds of colored transmission layers 12 and 13 having different light transmittances, By making the display unit 14 emit light by using the first light source 17 and the second display unit 15 by emitting light by the second light source 19, both display units 14 and 15 can be operated independently of each other. Since light emission display is performed, the light emission display brightness of the display units 14 and 15 can be adjusted to a desired state by adjusting the light emission brightness of the light sources 17 and 19 according to the transmittance of the colored transmission layers 12 and 13.

Further, the driver is expected to have individual differences in his / her driving state and desires. For example, if the driver frequently uses the high rotation area of the engine, the emission brightness of the display unit 15 is displayed. It is hoped that the high-speed red region will be highlighted by making it higher than the light-emitting brightness of the part 14, and if the driver who rarely uses the high-speed region of the engine, the light-emitting brightness of the display part 15 By lowering the light emission luminance of the display unit 14 compared to the light emission luminance, it is desired that the reddish high rotation region is not noticeable. Even in such a case, the lighting device of the present embodiment can arbitrarily change the light emission brightness of the light source 19 by the driver variably operating the brightness adjustment unit of the instrument panel, so that the display unit It is possible to adjust 15 independently of the display unit 14 and obtain a desired light emission display state of the driver corresponding to each display color.

Further, in this embodiment, since the light source 19 of the display unit 15 is composed of the LED chip, there is an additional effect that it can contribute to the thinning of the measuring device 1.

The light sources 17 and 19 are not limited to CCTs and LEDs, and various types such as filament lamps can be used. Depending on the selection of the light source, the brightness of the light source of the display unit 14 can be adjusted. Alternatively, the brightness of both light sources of both display units 14 and 15 may be adjustable.

Further, in the above-mentioned embodiment, the lighting box 18 is formed integrally with the case 2, but as shown in FIG. 4, the lighting box 18 A, which is a separate body from the case 2, is fixed to the case 2 with screws. Alternatively, the light source 19A composed of a tungsten bulb may be used at this time.

In each of the above embodiments, the display plate is provided with the display portions of two kinds of display colors, but the present invention can be applied to the case where the display portions of three or more kinds of display colors are provided. That is, each display color or display color is divided into several sets, and each set is provided with an electrically independent light source, and each display unit is directly or by a light guide or reflector by this light source. It is only necessary to indirectly illuminate through the light source, etc., and by providing at least one of the light sources so that the brightness can be adjusted, it becomes easier to set the light emission brightness of the display unit to a desired state as compared with the related art.

Further, in each of the above-described embodiments, one embodiment of the present invention has been described by taking the vehicle instrument device as an example, but it goes without saying that the present invention can be applied to a display panel of another device.

[0021]

[Effect of the device]

 As described above in detail, the present invention provides a display plate illuminating device comprising a display plate having a display part of a different display color on a translucent substrate and a light source provided behind the display plate. By arranging the light sources independently according to the color, it is possible to provide a display plate illuminating device capable of adjusting the illumination balance of the display plate to a desired state.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an essential part of the same.

FIG. 3 is a sectional view with a block diagram added to a part of the same.

FIG. 4 is a cross-sectional view of an essential part of another embodiment of the present invention.

[Explanation of symbols]

 4 display board 11 translucent substrate 12 first colored transmission layer 13 second colored transmission layer 14 first display section 15 second display section 17 first light source 19, 19A second light source 23 brightness adjustment section

Claims (2)

[Scope of utility model registration request] 1. A illuminating device for a display plate, comprising: a display plate having a display unit of a different display color on a translucent substrate; and a light source provided behind the display plate. An illuminating device for a display board, characterized in that: 2. The illuminating device for a display plate according to claim 1, further comprising a brightness adjusting unit capable of changing brightness of at least one of the light sources.