JPH01273087A - Display device - Google Patents

Abstract

PURPOSE:To improve freedom in terms of designing and to extend a display area by providing light entering parts in the peripheral edge of a light guide board equipped with a reflecting means on a rear surface oppositely arranged on the back of a surface lens, and making light from a light source incident on the light guide board. CONSTITUTION:When a LED 6 is turned on, light is made incident on the light guide board 4 from the light entering parts 24A and 24B, and propagates in the light guide board 4. A part of the light is projected on stipples 27 and a reflecting sheet 28 and reflected to the front surface and illuminates a mark part 20. The stipples 27 increase in density as distances from the light entering parts 24A and 24B increase, so that the entire mark part 20 is illuminated at an almost even brightness. On the other hand, in the daytime, sun light is reflected on the half-evaporated metallic film 21 of the mark part 20, and an illumination color is in a metallic tone. The light entering parts 24A and 24B can be increased and decreased in number and also changed in position if necessary, whereby the mark 20 is changeable in brightness to be applicable to a large display area. Consequently, a mark plate lamp 1 is improved in freedom in terms of designing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device suitable for application to mark plate lamps of automobiles, etc.

[Conventional technology]

Modern cars require fuel, brakes, oil doors, and safety belts to improve safety.

A display device is installed inside and outside the vehicle body to display the status of various lights, etc., or to display the vehicle body mark of the own army.
A display device disclosed in Japanese Patent No. 91 is known. In this method, a master display section is provided in the center of a disk-shaped display panel, and individual display sections are arranged radially around the display panel, and a light guide plate is provided at the center of the display panel facing the rear surface of the display panel. An insertion hole through which a master display light source is inserted is formed in the part, and a plurality of light emitting bodies made of light emitting diodes etc. are arranged in a ring shape around the light guide in correspondence with the light emitting windows of each individual display part. It was constructed as follows.

[Problem to be solved by the invention]

However, although such conventional display devices have the advantage of being able to perform various displays simultaneously, the master display light source must be placed in the center of the light guide plate, and there is little freedom in designing the light source position. There was a problem. Furthermore, when disposed at the center of the light guide plate, the number of light sources is restricted, which has the disadvantage that the display area becomes narrow. In other words, the display device itself is small, and if a large display device is to be obtained, a large light source is required and the device itself becomes large.

Therefore, the present invention solves the above-mentioned problems,
It is an object of the present invention to provide a display device which can improve the design freedom of the light source position with a simple configuration, has fewer restrictions on the number of light sources, and can expand the display range.

[Failure to solve the problem]

In order to achieve the above object, the present invention includes a body body, a substantially circular surface lens having a translucent display portion, the other portions being a light shielding portion, and a fringe fixed to the surface of the body body. a light guide plate, which is disposed opposite to the back surface of the front lens, has a light entrance part formed in a part of its periphery, and has a reflection means on its back surface; and a printed circuit board, which is disposed on the surface of the body main body. and a light source mounted on the printed circuit board so as to be located in the light input section, one end of which is connected to the electric circuit of the printed circuit board, and the other end of which is connected to the body main body through a cord lead-out hole provided in the center of the body main body. It consists of an external code led out to the back side.

[Effect]

In the present invention, any location on the periphery of the light guide plate is used as a light entrance portion of the light source, if necessary.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a front view showing an embodiment of the present invention applied to an internally illuminated mark plate lamp for an automobile, FIG. 2 is a right side view, and FIG. Figure 4 is the first
FIG. 5 is an enlarged sectional view taken along line V-V in FIG. 1. In these figures, the mark plate lamp 1 includes a main body 2, a front lens 3. Light guide plate 4. Printed circuit board 5° light source 6. It is composed of an external cord 7, etc., and is disposed at an appropriate location 2 on the surface of the vehicle body, such as a door 8 (FIG. 4), via a bushing 9, and is firmly fixed to a pair of left and right poles 10.

The body main body 2 is formed into a disc shape from a light-shielding white resin such as AB8, and a fitting wall 11 is integrally provided on the peripheral edge of the surface of the body 2 over the entire circumference, and a 7-shaped drainage groove 12 is provided. A support wall 13 for holding the back surface of the light guide plate 4 and a positioning wall 14 for the light guide plate 4 are formed near the inner side of the fitting wall 11 and protrude toward the front at the center of the surface. A cylindrical cord lead-out portion 15 is integrally provided to protrude rearward.

The surface lens 3 is formed into a disc shape that is slightly smaller than the body main body 2, and its surface is formed into a convex curved surface with a large curvature by heat press processing, and the peripheral edge is bent toward the back side over the entire circumference to form a fixed part. 16 is formed.

The fixing part 16 is provided protrudingly from the rear surface of its tip and is connected to the water cutting groove 12.
The fitting wall 11 has a 7-shaped cutout ridge 11 that engages with the fitting wall 11.
body 2 by ultrasonic welding.
It is fixed all the way around. A mark part (display part) 20 consisting of the letters AB is recessed in the center of the back surface of the front lens 3, and a metal half-deposited film 21 (FIG. 3) is formed on this mark part 20. The back surfaces other than 2o are covered with a light-shielding film layer (not shown) made of black paint or the like. The metal half-deposited film 21 reflects external light (sunlight) during the day to make the letters AE of the mark part 20 look gorgeous and improve visibility, giving it a metallic appearance, and is illuminated from the inside at night. It is composed of an Al film layer. Such an A7 film layer is formed thin (300 to 400 A) by vapor deposition or sputtering with appropriate gaps between the A7 particles that are in contact with each other and do not overlap, so that it has translucency. A suitably colored filter 23 is fixed to the back surface of the front lens 3 to protect the metal half-deposited film 21.

The light guide plate 4 is formed of a transparent resin such as acrylic resin into a plate shape having a larger area than the mark portion 20, and is closely attached to the center of the back surface of the front lens 3 via the filter 23, and the plate thickness is set at the upper end. It is the thickest and gradually becomes thinner towards the bottom. Further, a pair of left and right light entrance portions 24A, 24B consisting of insertion holes are formed on the upper end surface of the light guide plate 4, and a light emitting diode 6 as a light source is inserted into each of these light entrance portions 24A, 24B. Stipples 27 are formed on the back surface of the light guide plate 4 as reflecting means for reflecting the light 26 emitted from the light emitting diodes 6 and traveling through the light guide plate 4 toward the front surface. The stipples 27 consist of small conical recesses, and in order to uniformly illuminate the mark portion 20, the stipple density changes so that the stipples gradually become denser as the distance from the light emitting diode 6 increases.

A reflective sheet 28 is adhered to the back surface of the light guide plate 4, and this sheet 28 prevents the light traveling inside the light guide plate 4 from exiting to the back surface side, thereby making effective use of the light. .

The printed circuit board 5 is closely fixed to the surface of the body main body 2 by a plurality of protrusions 30, and the light emitting diodes 6 are mounted on the surface of the printed circuit board 5 at locations corresponding to the light entrance portions 24A and 24B.
are mounted respectively, and one end of the external cord 7 is connected to the center of the back surface.

The protrusion 30 is integrally provided on the surface of the main body 2 and inserted into a small hole in the printed circuit board 5, and its tip is sealed to prevent it from slipping out of the small hole. The external cord 7 is led out into the vehicle body through a center hole of the cord lead-out portion 15, that is, a cord lead-out hole 32. A bushing 31 is fitted and fixed to the opening on the front end side of the cord lead-out part 15 to prevent rainwater from entering from the cord lead-out part 15. Further, a gasket 34 is fitted to the base of the outer peripheral surface of the cord lead-out portion 15 for waterproofing the cord passage hole 33 (FIG. 4) provided in the door 8.

The bushing 9 is formed of EPT rubber or the like in an annular shape,
A covering part 35 is integrally provided on the outer peripheral part of the main body 2 and is bent in an abbreviated shape toward the surface side.
This covers the welded portion of the front lens 3 and improves the appearance quality of the mark plate lamp 1. The inner peripheral edge of the bushing 9 has a waterproof piece 39.40 (see Fig. 3, Fig. 5) for waterproofing the light source exchange hole 36 (Fig. 3) and the bolt insertion hole 37 (Fig. (Fig.) are each extended as one unit. The waterproof piece 39 is usually connected to the light source exchange hole 36.
When the light emitting diode 6 is replaced, it is removed from the replacement hole 36 when the light emitting diode 6 is replaced. In addition,
The connecting portion between the bushing 9 and the waterproof piece 39 is thin and forms a hinge portion 41 . On the other hand, an insertion hole 43 into which the bolt 10 is inserted is formed in the center of the waterproof piece 40. The bolt 10 is fixed to the body body 2 by cold tightening, but is not limited to this, and may be formed integrally with the body body 2 by insert molding or ultrasonically welded. good.

The portion of the main body 2 to which the bolt 10 is attached, that is, the bolt attachment portion, corresponds to the thin portion of the light guide plate 4, thereby making the mark plate 1 as a whole thinner. Further, a stopper rib 45 shown in FIG. 5 is integrally provided at the bolt attachment portion on the back surface of the main body 2 to prevent damage to the main body 2 due to over-tightening of the bolt 10. A drainage groove 46 (FIG. 4) is formed in the radial direction on the lower back surface of the bushing 9, so that rainwater accumulated between the body main body 2 and the door 8 can escape.

In the mark plate lamp 1 having such a configuration, when the light emitting diode 6 is turned on at night, the light enters the light guide plate 4 through the light entrance portions 24A and 24B and travels inside the light guide plate 4. A part of the O stippling 27 hits the stippling 27 and the reflective sheet 28 and is reflected toward the surface side, illuminating the mark portion 20.
Since the density increases as the distance from 4B increases and the amount of light irradiation per unit area becomes equal, the entire mark portion 20 can be illuminated with approximately uniform brightness.

The illumination color of the mark section 20 is determined by the filter 23.

On the other hand, in the daytime, sunlight is reflected by the metal nozzle vapor deposited film 21 of the mark part 20, giving a metallic illumination color.In the present invention, the light entering part 24A, 14B
are provided, so the number can be increased or decreased as needed, and the position can also be changed as needed, so the brightness of the mark section 20 can be changed freely. Therefore, there is an advantage that the degree of freedom in design is expanded, and it can still be applied to objects with a large display range.

Although the above embodiment has been described with reference to the case where the present invention is applied to a mark plate lamp, the present invention is not limited to this in any way, but can also be applied to a display device that displays a warning.

Furthermore, although the light emitting diode 6 was used as the light source in the above embodiment, a light bulb may be used instead.

〔Effect of the invention〕

As explained above, in the display device according to the present invention, a light entrance part is provided at the periphery of the light guide plate disposed opposite to the back side of the front lens, and the light emitted from the multiple light sources is input into the light guide plate through the light entrance part. As a result, the number of light entrance parts, in other words, the number of light sources, can be increased or decreased as necessary, and the formation of the light entrance part can be applied to the entire circumference, increasing the degree of freedom in design. The display range can be expanded, and the effect is great.

[Brief Description of the Drawings] Fig. 1 is a front view showing an embodiment of the present invention applied to a mark plate lamp, Fig. 2 is a right side view, and Fig. 3 is a 1 mm enlarged view of Fig. 1. 4 is a cross-sectional view taken along the line ■--IV in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line V--V in FIG. 1...Fist mark flat lamp, 2...Body body, 3...Surface lens, 4...Light guide plate, 5...Fist...Printed circuit board, 6...Light source, 7...・・External code, 2o・・・r -ri part, 24A, 24B・・
e. Light entrance part, 32... Code lead-out hole. Patent applicant: Koito Manufacturing Co., Ltd.

Claims (1)

[Claims] A body main body, a substantially circular front lens having a light-transmitting display portion, the other portion being a light shielding portion, and a peripheral edge fixed to the surface of the body main body, and a substantially circular front lens disposed opposite to the back surface of the front lens. a light guide plate having a light receiving section formed on a part of its periphery and a reflecting means provided on the back surface; a printed circuit board disposed on the surface of the body main body; A light source mounted on a board, and an external cord having one end connected to an electric circuit of the printed circuit board and the other end leading out to the back side of the body main body through a cord lead-out hole provided in the center of the body main body. A display device characterized by: