JPH0222899Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a display device that is placed on a dashboard of an automobile or the like to display direction instructions, warnings, and the like.

[Prior Art] Conventionally, as shown in FIGS. 7a and 7b, for example, as shown in FIGS.
A translucent lens member 22 having the same shape and color is fitted so that the surface of the substrate 20 and the surface of the lens member 22 are flush with each other, and the lens member 22 is illuminated by a lamp 23. It has been known.

According to this display device, when indicating a direction, the lamp 2
3 is lit, a part of the light from the lamp 23 is transmitted through the arrow-shaped lens member 22, so that the lens member 22 itself appears to be shining brightly.

In the above display device, in order to prevent the lens member 22 from slipping out to the front side of the substrate 20 when the lens member 22 is fitted from the back side of the substrate 20,
A stepped engaging portion 24 is formed on the inner circumferential edge of the fitting hole 21, and the engaging portion 24 is formed on the outer circumferential edge of the lens member 22.
Similarly, a step-shaped engaged portion 25 that engages with is formed.

Here, in order to easily fit the lens member 22 into the fitting hole 21, the inner width of the fitting hole 21 is set to be slightly larger than the outer width of the lens member 22.
Therefore, there is a gap δ between the fitting hole 21 and the lens member 22.

[Problems to be solved by the invention] However, when there is such a gap δ, the bottom of the gap δ (a part of the stepped portion 25a of the engaged portion 25) may be visible depending on the viewing direction. , I had the following problem. That is, the thickness of this stepped portion 25a is t ₁
The wall thickness t ₀ of the portion other than the engaged portion 25 is approximately half, and when the lamp 23 is turned on, a large amount of light passes through the lens member 22 compared to other portions.
There was a problem where a part of the periphery of the image seemed to shine more than other parts.

As a means to solve such a problem, for example, it may be possible to make the wall thickness t ₁ of the stepped portion 25 a closer to the wall thickness t ₀ of other parts, but in this case, the wall thickness of the stepped portion 24 a of the fitting hole 21 A problem arises in that t ₂ becomes thin and the lens member 22 cannot be engaged and held.

In addition, the stepped portion 25a is painted and the lamp 23
It is conceivable to prevent the light from passing through, but this poses the problem of tedious work and increased production costs.

The purpose of this invention is to be able to securely hold the lens member, without increasing production costs, and to solve the problem of the conventional technology, that is, the problem that a part of the peripheral edge of the lens member appears to be more shiny than other parts. An object of the present invention is to provide a display device that can solve the problem.

[Means for solving the problem] In order to achieve the above object, in this invention, a fitting hole of a predetermined shape is formed in the substrate, and the lens member is inserted into the fitting hole so that the surface of the substrate and the surface of the lens member are connected to each other. In a display device configured to be fitted so that they are flush with each other and illuminated from the back side of the lens member by a lighting device, an engaging portion consisting of a plurality of stepped portions is formed on the inner peripheral edge of the fitting hole, and the An engaged portion consisting of a plurality of steps that engages with the engaging portion is formed on the outer peripheral edge of the lens member, and the first step on the front side of the lens member of the engaged portion is directed toward the back surface. It used to be characterized by being made by sloping the board so that the thickness of the board gradually decreases.

[Operation] Since the engaged portion is formed of a plurality of steps, the thickness t ₃ of the stepped portion located on the surface side of the lens member is greater than that of other portions other than the engaged portion. It is only slightly thinner than the plate thickness t ₀ (see Figure 4),
It can be seen that the amount of light transmitted from the lamps is almost the same, and there is not much difference in brightness.

In addition, regarding the engaging portion on the inner circumferential edge of the fitting hole, since the stepped portion on the front side of the lens member is sloped so that the plate thickness becomes thinner as it goes toward the back side, the engaging portion that engages with this portion On the contrary, the plate thickness of the stepped portion of the joining portion becomes thicker (see FIG. 4), making it possible to ensure sufficient mechanical strength for holding the lens member.

[Embodiment] An embodiment of this invention will be described below with reference to the drawings.

Figures 1a and 1b show an embodiment in which this invention is applied to a direction indicating display device. Reference numeral 1 in the figure is a substrate (endpaper), which is made of a synthetic resin colored black, for example, so that no light passes through.
A fitting hole 2 in the shape of an arrow is formed in this substrate 1, and a lens member 3, also formed in the shape of an arrow, is fitted into the fitting hole 2 from the back side of the substrate 1. This lens member 3 is made of a translucent synthetic resin colored green, for example. Lamps 4 for illuminating the lens are arranged at predetermined intervals on the back side of the lens member 3 (see FIG. 2). On both sides of the position where lamp 4 is placed,
Light shielding walls 5, 5 are provided so that the light from the lamp 4 irradiates only the lens member 3 side and prevents it from leaking to other parts.

Here, when the lamp 4 is turned on, a part of the light from the lamp 4 passes through the lens member 3, and the lens member 3 itself appears to be shining, indicating direction. is the same as
Next, the features of this idea will be explained.

3 to 6 show the fitting hole 2 and the lens member 3 in detail. As shown in detail in FIGS. 3, 4, and 6 (particularly FIG. 4), the inner peripheral edge of the fitting hole 2 has a first step 6a and a second step 6b.
An engaging portion 6 consisting of the lens member 3 is formed, and the lens member 3
Similarly, an engaged portion 7 consisting of a first step portion 7a and a second step portion 7b is formed on the outer peripheral edge of the first step portion 7a.
The stepped portion 6a and the first stepped portion 7a engage with each other, and the second stepped portion 6a engages with the first stepped portion 7a.
The stepped portion 6b and the second stepped portion 7b engage with each other to prevent the lens member 3 from slipping out from the fitting hole 2 toward the front surface of the substrate 1.

Here, as shown in detail in FIG. 4, the fitting hole 2 is formed to be slightly larger than the lens member 3, so that the lens member 3 can be easily fitted even if there is some dimensional error. I have to. Therefore, there is a gap δ between the fitting hole 2 and the lens member 3.
(This refers to the gap between the front surfaces of the substrate 1 and lens member 3.
There is also a gap on the back side, but this gap is not visible from the outside due to the substrate 1. ), and depending on the viewing direction, the bottom of this gap δ, that is, a portion 70a of the first step 7a can be seen from the outside. However, the plate thickness t ₃ at the portion 70 a is slightly thinner than the plate thickness t ₀ at the portion other than the engaged portion 7 .
In other words, the engaged portion 7 is formed by the two step portions 7a and 7b.
Therefore, the height of the stepped portion 7a (the height at the portion 70a) is only about 1/4 of the plate thickness t ₀ (for example, 3.0 mm) of the lens member 3 (for example, 0.7mm), and the plate thickness t ₃ (for example,
2.3 mm (3.0 mm−0.7 mm=2.3 mm)) is only slightly thinner than the plate thickness t ₀ of the lens member 3.
Therefore, the amount of light transmitted from the lamp 4 does not change much, and the problem that the part 70a of the step part 7a looks particularly brighter than other parts does not occur.

On the other hand, since the step part 7a is inclined so that the plate thickness becomes thinner from the part 70a of the step part 7a toward the part 70b that engages with the first step part 6a of the engaging part 6, the first step part 7a becomes thinner. On the contrary, the plate thickness becomes thicker in the stepped portion 6a (see FIG. 4), so that the lens member 3 can be reliably engaged and held.

In the prior art, one step 25a is used to connect the engaged portion 2.
5, and the stepped portion 24a that engages with the stepped portion 25a is formed thick so that the engaging portion 24 can engage and hold the lens member 22. Therefore, the stepped portion 25a is approximately half of the plate thickness _t0 . Therefore, the plate thickness t ₁ obtained by subtracting the height of the stepped portion 25 a was half the plate thickness t ₀ of the portion other than the engaged portion 25 (see FIG. 7a).
Therefore, the amount of light transmitted through the stepped portion 25a is larger than that at other portions, and there is a problem that a portion of the periphery of the lens member 22 appears brighter than other portions.
In this embodiment, as described above, the two step portions 7a,
This problem is solved by forming the engaged portion 7 with 7b and slanting the stepped portion 7a so that the thickness of the stepped portion 7a becomes gradually thinner.

Note that the portion 7 where the stepped portion 7a and the stepped portion 6a are connected
It is preferable that the length L of 0b is not set too long. The reason for this is that when the length L of the engaging portion 70b becomes longer, the flow of the molten resin during the molding process of the lens member 3 becomes poor, resulting in what is called a short shot.

The second step 7b of the lens member 3 is formed to fit within the second step 6b of the substrate 1 (see FIGS. 3 and 6), and is erected within the second step 6b. The stepped portion 7b is fixed within the stepped portion 6b by thermally welding pins 8, 8 (see FIG. 6) for heat welding. As a means for fixing the stepped portion 7b within the stepped portion 6b, in addition to this heat welding, for example, press fitting may be used.

Note that reference numeral 9 in FIG. 6 is a rib provided on the back surface of the substrate 1, which holds the lens member 3.

In the above embodiment, the case where the present invention is applied to a direction indicating display device is shown, but the present invention is not limited to this, and the present invention can also be applied to a warning display device, for example.

Further, the number of step portions 6a, 6b and step portions 7a, 7b is not limited to two, and may be three or more.

[Effects of the invention] As explained above, according to this invention, an engaging portion consisting of a plurality of steps is formed on the inner peripheral edge of the fitting hole,
Further, an engaged portion consisting of a plurality of steps that engages with the engaging portion is formed on the outer peripheral edge of the lens member, and further, the first stepped portion on the front side of the lens member of the engaged portion is placed on the back surface side. Since the plate is sloped so that the plate thickness becomes thinner and thinner as it approaches, it is possible to securely hold the lens member and eliminate the problems of the conventional technology without increasing the production cost.
That is, it is possible to solve the problem that a part of the peripheral edge of the lens member appears to shine more than other parts.

[Brief explanation of the drawing]

1 to 6 show an embodiment of this invention, in which FIG. 1a is a partial sectional view, FIG. 2b is a partial plan view, and FIG. 2 is a sectional view showing the arrangement position of the lamp
FIG. 3 is an enlarged plan view of the lens member, FIG. 4 is an explanatory diagram showing in detail the engaged state of the engaging part and the engaged part,
FIG. 5 is an enlarged side view of the lens member, FIG. 6 is an explanatory view showing a state in which the lens member is fixed to the fitting hole, and FIGS. 7a and 7b show the prior art.
Figure a is a partial sectional view, and Figure b is a partial plan view. 1... Board, 2... Fitting hole, 3... Lens member, 4...
Lamp, 6... Engaging portion, 6a... First step portion, 6b...
Second step portion, 7... Engaged portion, 7a... First step portion,
7b...second step part, 70a...portion visible from the outside.

Claims (1)

[Claims for Utility Model Registration] A fitting hole of a predetermined shape is formed in a substrate, a lens member is fitted into the fitting hole so that the surface of the substrate and the surface of the lens member are flush with each other, and the lens is illuminated by a lighting device. In the display device configured to illuminate from the back side of the member, an engaging portion consisting of a plurality of steps is formed on the inner circumferential edge of the fitting hole, and an engaging portion consisting of a plurality of steps is formed on the outer circumferential edge of the lens member. An engaged portion is formed of a plurality of stepped portions that fit together, and the first stepped portion of the engaged portion on the front side of the lens member is inclined so that the plate thickness becomes gradually thinner toward the back side. A display device characterized by: