JPS61245022A - Viewing plate - Google Patents

Abstract

PURPOSE:To reflect an external light reflected by the surface of a viewing plate, to the outside of a visual field, and also to execute a good visual confirmation for a long period of time by constituting the top part of an inclined face so that it is scarcely cracked, by forming a projecting part whose sectional shape is a saw tooth shape, in a minute parallel line, on the surface of the viewing plate, and chamfering the top part of its tip. CONSTITUTION:Many projecting parts 22 consisting of a vertical face 19 and an inclined face 21 are formed continuously on the surface of a viewing plate 14, and as for an external light irradiated from the rear of an operator 17, a part of its light is reflected by the surface of the viewing plate 14, but it is reflected to the outside of a visual field by the inclined face 21 provided on its surface, therefore, a dial 13 can be confirmed visually in a good condition. Also, a top part of the projecting part 22 formed on the surface of the viewing plate 14 is chamfered along the edge line direction, therefore, the curved top part 20 is scarcely cracked, it is suppressed that the surface of the viewing plate 14 is damaged, and its visibility is raised. Moreover, a light shielding plate 23 is buried along the vertical face 19 in the inside of the viewing plate 14, therefore, the reflected light which is reflected by the reverse side of the viewing plate 14 and travels to the top part 20 is absorbed, and the internal reflection is suppressed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a see-through plate disposed as a front cover of a display device, such as an indicating instrument, and in particular, the present invention relates to a see-through plate disposed as a front cover of a display device, such as an indicating instrument, and in particular, in the case of external light irradiating the surface of the see-through plate. This invention relates to a see-through plate that reflects light rays reflected on its surface out of the field of view in a direction other than the viewing direction.

[Related technology and problems thereof] Generally, display devices such as instruments and image display devices of automobiles, or various measuring instruments are disposed with a transparent plate covering the front surface of the display device.

This type of display device will be explained using automobile instruments as an example. Generally speaking, when a flat transparent plate made of a glass substrate or a synthetic resin substrate with translucent properties is used as a front cover for an indicating instrument such as a vehicle, external light shining onto the surface of the flat transparent plate is used. Since the surface of the see-through plate shines as it reflects in the direction of the driver's line of sight, there is a problem in that it becomes difficult to read display devices placed behind it, such as the dial of an indicator or a fluorescent display tube. Ta.

In order to solve these problems, various structures have been proposed in which the see-through plate covering the front of the instrument has an anti-glare function.

For example, Utility Model Application Publication No. 56-122 filed earlier by the applicant
As disclosed in No. 913, a large number of sloped surfaces with sawtooth cross sections are formed on the surface of the transparent plate, and a portion of external light is reflected by the sloped surfaces, and the reflected light is directed to the driver's line of sight. We are proposing a see-through plate that has an anti-glare function by guiding it out of the line of sight.

However, since the tops of the numerous serrated slopes provided on the surface of this transparent plate are sharp, the tops of the slopes may chip if the transparent plate is wiped or an object hits it. As a result, the surface of the viewing plate is easily scratched. Such a polarized part reflects external light and guides it in the direction of the line of sight, or it is used as an internal light source installed on the back side of the dial of an indicator, or as a self-luminous display such as a fluorescent display tube or a light emitting diode. When the irradiated light beam from the instrument passes from the inside of the indicator to the viewing plate and then to the outside, the light beam is focused on this polarized part, and the polarized part appears to shine due to this focused light beam, and the inside of the indicator is visible. This may impede the reading of displays, etc.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and it reflects external light rays reflected on the surface of the see-through plate out of the field of view in a direction other than the line-of-sight direction, and also cuts the top of the sloped surface into a chip. Therefore, it is an object of the present invention to provide a see-through plate that can be clearly viewed for a long period of time.

[Structure of the Invention] In order to achieve the above object, the present invention forms protrusions having an i-plane serration shape in fine parallel lines on the surface of a see-through plate, and chamfers the top of the tips of the protrusions. This prevents a portion of external light from being reflected on the see-through plate and traveling in the viewing direction, and also prevents the top of the tip of the protrusion from chipping to improve visibility.

[Example〕 Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 and FIG. 2 show one embodiment of the present invention, which will be explained here using an example of an indicating instrument such as an automobile. In the figure, an indicator body 12 is disposed inside an indicating instrument 11 such as a speedometer mounted on the instrument panel of a car, and a dial 13 is disposed on the front side of this instrument body 12. A see-through plate 14, which will be described later, is provided on the front side of the indicator 11 as a front cover for the indicator 11. A hood 15 is formed protruding from the periphery of the indicator 11 to absorb light reflected by the transparent plate 14 and block light from above. A light source 16 is provided that illuminates from the
i1B is turned on to illuminate the dial 13.

On the surface of the transparent plate 14, there is a vertical surface 19 substantially parallel to the line of sight direction 18 of the driver 17, and an inclined surface 2 extending from the top 20 of this vertical surface 19 and inclined at an angle θ with respect to the line of sight direction 18.
A protrusion 22 having a sawtooth cross-sectional shape consisting of
They are continuously formed into fine parallel lines so that the 0 ridgeline is in the horizontal direction. Further, the top portion 20 of the protrusion 22 is chamfered along the ridgeline direction to form a rounded shape. Roughly speaking, a light shielding plate 23 is embedded inside the transparent plate 14 along the vertical plane 19, and this light shielding plate 23 blocks the light beams with diagonal components from the vertical direction, and the light beams traveling straight, that is, horizontally. It is constructed so that light rays in this direction are transmitted through it.

The present invention configured in this manner will be described in detail. First, a large number of protrusions 22 each consisting of a vertical surface 19 and an inclined surface 21 are continuously formed on the surface of the transparent plate 14, and a portion of the external light irradiated from behind the driver 11 is transmitted to the surface of the transparent plate 14. However, since it is reflected out of the field of view by the inclined surface 21 provided on the surface thereof, the dial 13 can be read well.

In addition, the top 2 of the protrusion 22 formed on the surface of the transparent plate 14
0 is chamfered along the ridgeline direction, so the rounded top portion 20 is less likely to chip.

That is, the surface of the see-through plate 14 on which the protrusion 22 is formed is prone to dust, but even if the surface is wiped with a cloth, the top portion 20 is less likely to chip, and the surface of the see-through plate 14 is prevented from being scratched. The visibility of the board 14 is increased.

Further, a part of the external light incident on the transparent plate 14 is reflected on the back surface of the transparent plate 14 and travels to the vertical surface 19 and the inclined surface 21 forming the protrusion 22, and is repeatedly internally reflected at 20 points on the top of the transparent plate 14. I try to sleep. However, there is a vertical surface 1 inside the transparent plate 14.
Since the light shielding plate 23 is buried along the line 9, the transparent plate 1
4 and absorbs the reflected light that travels to the top 20, suppressing internal reflection. Therefore, it is possible to suppress the convergence of reflected light due to repeated internal reflections at the 20 locations on the top of the protrusion 22, and prevent the ridgeline locations on the top 20 from appearing lifted like a band. In addition, the light shielding plate 23 gives directionality to the internal light rays from the night light source 16, and by controlling the irradiation direction of the internal light, the light rays irradiated from the inside from all directions can be converted into horizontal components by the light shielding plate 23. Only the light rays or the light rays traveling in a straight line can pass through, thereby preventing the light rays entering the transparent plate 14 from converging on the top 20 portions of the protrusions 22 on the front side thereof.

[Other Embodiments] Although one embodiment of the present invention has been described in detail above, various modifications can be made within the scope of the gist of the present invention. For example, as shown in FIG. 3, the base 24 of the vertical surface 19 can also be chamfered into a rounded shape. In this way, the narrow base 24 can be easily molded, and dirt and the like attached to the base 24 can also be wiped off. Furthermore, as shown in FIG. 4, the chamfering of the top portion 20 is not limited to a rounded shape, but it is also possible to cut the top portion 20 parallel to the surface of the see-through plate 14 and chamfer it. Further, as shown in FIG. 5, in order to prevent light from condensing at 20 locations on the top 20, the chamfered top 20 may be colored with a light-blocking agent 25 such as black along the ridgeline.

Since the colored portion of the opaque agent 25 is thin like a line, there is no problem in reading the dial 13, and it is possible to prevent light from condensing at the top 20 locations. In this case, the light shielding plate 23 shown in FIGS. 1 to 4 is unnecessary.

In addition, in FIGS. 1 to 5, in order to suppress light condensation at the top 20, the light shielding plate 23 and the light-blocking agent 25 are provided at an angle of 4 degrees.
It is also possible to simply chamfer the top portion 20.

Further, in each of the above embodiments, the back surface of the transparent plate 14 is made flat, but the rear surface may also be formed with a protrusion 22, an inclined surface 21 may be formed downward from the top 20, or the transparent plate 14 may be colored. It is also possible to do so. Furthermore, the invention is not limited to instruments for vehicles, but can also be applied to other instruments and see-through plates used in display devices such as televisions.

[Effects of the Invention] As described in detail above, according to the present invention, by forming protrusions with a serrated cross section on the surface of the transparent plate in the form of fine parallel lines, external light can be directed to the surface of the transparent plate. Even if the reflected light is reflected by the camera, this reflected light can be guided out of the field of view in a direction other than the line of sight.The chamfered top of the tip of this protrusion prevents the sharp top from chipping or scratching, making it easy to see through. The display medium inside the board can be clearly seen.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing one embodiment of the present invention, and FIG.
The figure is a perspective view showing the main parts of the see-through plate, and FIGS. 3, 4, and 5 are perspective views showing the main parts of other embodiments of the see-through plate. 11...Instrument panel 12...Indication instrument 13...Dial board 14...See-through plate 18...Direction of sight 19
...Vertical surface 20...Top 21...Slanted surface 22...Protrusion 23...Shade plate patent Applicant: Representative of Nippon Seiki Co., Ltd.
Patent Attorney Mamoru Ushiki Figures 1 @ 2, 3 and 4 Figure II 5 Procedural amendment (voluntary) 1. Indication of the incident 1985 Patent Application No. 87306 2. Name of the invention Transparent plate 3. Amendment person who does

Claims (1)

[Scope of Claims] A see-through plate characterized in that protrusions having a serrated cross section are formed in fine parallel lines on the surface of the see-through plate, and the tops of the tips of the protrusions are chamfered.