JPH0523404U - Vehicle display - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a vehicular display device in which heat generated from a fluorescent display tube is efficiently radiated to prevent reduction in display brightness. [Structure] A first opening 20a is provided in an upper portion of a case 20 having a substantially trapezoidal cross section. A second opening 20b is provided on the side surface of the case 20. Second opening 20
The fluorescent display tube 7 is fitted at the position of b. The electronic circuit board 8 of the fluorescent display tube 7 is housed in a housing portion 20c provided under the case 20, and the fluorescent display tube 7 and the electronic circuit board 8 are interconnected by a flat flexible cable 14. . A heat dissipation sheet 1 is provided on the back of the fluorescent display tube 7.
3 are closely arranged, and the heat dissipation plate 12 is attached to the back surface thereof. The reflecting mirror 10 is attached to the side surface on the side facing the second opening 20b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display device for a vehicle, more specifically, a fluorescent display tube for displaying information and an electronic circuit board for driving the fluorescent display tube are separately arranged, and a heat dissipation device is attached to the back surface of the fluorescent display tube. The present invention relates to a display device for a vehicle.

[0002]

[Prior Art]

 Conventionally, fluorescent display tubes have been widely used as vehicle display devices that digitally display vehicle speed and engine speed. The fluorescent display tube is a display device that utilizes the phenomenon of excitation and emission of a phosphor by a low-speed electron beam, and its basic structure is similar to that of a triode vacuum tube, and generally includes a front glass, a cathode (filament), a control grid, It is composed of an anode coated with a phosphor and a supporting substrate supporting the anode. Then, by the operation of the electronic circuit for driving the fluorescent display tube, the thermoelectrons emitted from the cathode which is electrically heated are diffused and accelerated by the control grid and collide with the fluorescent material coated on the anode to cause the fluorescent material to be discharged. Excited to emit light. Usually, the anode is printed in the shape of a segment, and the necessary segment is selected and displayed by an electronic circuit.

FIG. 5 shows the fluorescent display tube as a head-up display type vehicle display device. That is, the vehicle display device 1 is arranged in the dashboard 2, and the light emitted from the display image of the vehicle display device is provided on the inner surface of the windshield 3 through the opening 2a of the dashboard 2. It is reflected by the reflection processing unit 4 and guided to the driver's viewpoint 5. Therefore, when viewed from the viewpoint 5, the display image is visible as a virtual image X behind the windshield 3 (in front of the vehicle).

As shown in FIG. 6, the arrangement configuration of each component of the vehicular display device 1 in this case is such that the fluorescent display tube 7 and the reflecting mirror 10 are arranged substantially opposite to each other in the case 6, The fluorescent display tube 7 is attached to a circuit board 8 in which an electronic circuit for driving the fluorescent display tube 7 is incorporated, and a connector 9 for inputting power and information through a cord is attached to the circuit board 8 as a case. 6 is attached to the outside. When information or the like is input to the circuit board 8 through the connector 9, the fluorescent display tube 7 emits light, and the emitted display image is reflected by the reflecting mirror 10 and emitted from the opening of the case 6. Then, it is reflected by the reflection processing unit 4 of the windshield 3, reaches the driver's viewpoint 5, and is visually recognized as a display image.

[0005]

[Problems to be solved by the device]

 However, when the fluorescent display tube 7 is mounted on the electronic circuit board and mounted in the case 6 and turned on for a long time, the fluorescent display tube 7 generates a large amount of heat but does not radiate enough heat. There is a problem in that the body itself becomes hot and causes a decrease in display brightness.

An object of the present invention is to provide a vehicular display device in which heat generated from a fluorescent display tube is efficiently radiated to prevent a reduction in display brightness.

[0007]

[Means for Solving the Problems]

 In the vehicle display device according to the present invention, the fluorescent display tube and the electronic circuit board for driving the fluorescent display tube are separated from each other, and the fluorescent display tube is positioned at the opening provided in the case. It is characterized in that the heat dissipating device is closely attached to the back surface of the fluorescent display tube while being attached to the case.

[0008]

[Action]

 Based on the above configuration, when the fluorescent display tube is turned on via the electronic circuit in the electronic circuit board, the fluorescent display tube displays information and generates heat. This heat is absorbed by the heat dissipation device that is placed in close contact with the back surface of the fluorescent display tube and is efficiently dissipated to the outside. Therefore, the temperature rise of the fluorescent display tube is suppressed and the problem of lowering the display brightness does not occur.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same members as those of the vehicle display device described in the section of the related art are designated by the same reference numerals.

FIG. 1 shows a head-up display type display unit 11 as one embodiment of a vehicle display device according to the present invention. The display unit 11 has a case 20 having a substantially trapezoidal cross section, a rectangular first opening 20a is provided in an upper portion of the case 20, and a substantially rectangular second opening 20a is provided on a side surface of the case 20. Is provided with an opening 20b. The second opening portion 20b is where the display portion of the fluorescent display tube 7 is located, and the fluorescent display tube 7 is attached to the outer peripheral portion of the case 20 in which the second opening portion 20b is provided. The positioning protrusion 16 is provided, and the packing 15 is attached to the inside of the positioning protrusion 16 around the entire periphery of the opening 20b.

Then, the fluorescent display tube 7 is fitted into the second opening 20b so that the display portion thereof is positioned, and the front surface of the fluorescent display tube 7 is received by the packing 15 to prevent uneven contact that occurs during assembly. is doing. Further, the electronic circuit board 8 of the fluorescent display tube 7 is housed in a housing portion 20c provided on the lower side of the case 20, and the fluorescent display tube 7 and the electronic circuit board 8 are interconnected by a flat flexible cable 14. ing. Further, a heat dissipation sheet 13 is arranged in close contact with the back surface of the fluorescent display tube 7, and a heat dissipation plate 12 is attached to the back surface thereof.

In order to secure a large heat dissipation area on the outside of the heat sink 12, as shown in FIG. 2, there are provided a number of convex ridges 12 a, and screw holes are provided at the four corners of the heat sink 12. However, a gap is provided at a part of the lower side to pull out the cord of the connector 9. When the heat radiating plate 12 is screwed to the case 20 through the screw hole, the back surface of the fluorescent display tube 7 and the heat radiating plate 12 are in close contact with each other with the heat radiating sheet 13 sandwiched by the pressure of the packing 15.

As shown in FIG. 3, the end face 20bb of the second opening 20b is provided with an inclination toward the outside of the case 20, and the display light of the fluorescent display tube 7 is reflected by the end face 20bb. It is prevented from being visually recognized. The end surface 20bb may be inclined inside the case 20, as shown in FIG. Further, the side surface of the case 20 on the opposite side facing the second opening 20b is inclined, and the reflecting mirror 10 is attached so as to be in close contact with the inside of the side surface. Therefore, the light from the display image of the fluorescent display tube 7 is reflected by the reflecting mirror 10 and exits from the first opening 20a of the case 20, and is reflected by the reflection processing unit 4 of the wind shield 3 shown in FIG. It is guided to the person's viewpoint 5.

Since the present embodiment is configured in this manner, when the fluorescent display tube 7 is turned on via the electronic circuit in the electronic circuit board 8, the fluorescent display tube 7 displays information. It heats up. This heat is absorbed by the heat dissipating devices 12, 13 which are closely arranged on the back surface of the fluorescent display tube 7, and is efficiently dissipated to the outside of the case 20. Therefore, the temperature rise of the fluorescent display tube 7 is suppressed and the display brightness does not decrease.

[0015]

[Effect of the device]

 As described above, according to the present invention, the fluorescent display tube and the electronic circuit board for driving the fluorescent display tube are separated, and the heat dissipation device is closely attached to the fluorescent display tube. Since the generated heat can be efficiently dissipated, the temperature rise can be suppressed and the decrease in the brightness of the fluorescent display tube can be suppressed.

[Brief description of drawings]

FIG. 1 is a side view of a vehicle display device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a vehicle display device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a vehicle display device showing in detail a mounting portion of a fluorescent display tube.

FIG. 4 is a cross-sectional view of a vehicular display device in which a mounting portion of a fluorescent display tube is changed.

FIG. 5 is a diagram showing a state in which the vehicle display device is installed in a vehicle as a head-up display type.

FIG. 6 is a side view of a conventional vehicle display device using a fluorescent display tube.

[Explanation of symbols]

 7 Fluorescent Display Tube 8 Electronic Circuit Board 12 Heat Dissipator (Heat Sink) 13 Heat Dissipator (Heat Sink Sheet) 20 Case 20b Opening (Second Opening)

Claims (1)

[Scope of utility model registration request] 1. A fluorescent display tube and an electronic circuit board for driving the fluorescent display tube are separated from each other, and the fluorescent display tube is mounted on a case so that its display portion is located at an opening provided in the case. A display device for a vehicle, characterized in that a heat dissipation device is closely attached to the back surface of the fluorescent display tube while being attached.