JPH0625678B2 - Dot pattern of illumination adjustment film in indicating instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention is an illumination formed by printing on a dial for equalizing the brightness of the display portion on the front of the dial when the indicator is illuminated. The present invention relates to the improvement of the dot pattern of the adjustment film.

(Prior Art) It is known from Japanese Patent Publication No. 53-2065 that an illumination adjusting film is formed by printing on the rear surface of the dial in order to make the brightness of the display part of the dial uniform during illumination. And
Further, a method for producing an illumination adjusting film is known from JP-A-60-123728 and JP-A-63-61117. Then, the illumination adjusting film is formed by a dot pattern in which the dot area in each element of the virtual matrix on the dial plate surface is changed according to the light blocking ratio necessary for equalizing the brightness. As a dot pattern of this illumination adjustment film, one dot is provided in each element of the virtual matrix,
At least the main part of the dot pattern is configured by changing the size of the dots according to the light blocking rate.

(Problems to be Solved by the Invention) As described above, if the entire dot pattern is formed by the positive, the dots may become large in a place where the light blocking rate is large, and the dots 3 may be seen through from the front surface of the dial during illumination. Therefore, in order to prevent this, as shown in FIG. 6, one dot 3 is provided in each element 2 of the virtual matrix 1, and a dot on the small light blocking rate is set at a predetermined light blocking rate, for example, 50%. A means for forming positive and large dots by a negative is conceivable.

However, if the dot pattern of the illumination adjustment film is formed by positive and negative with a predetermined light blocking rate as a boundary, the dots become smaller as the light blocking rate increases from the boundary portion, so that the dot is seen through from the front of the dial. Although it can be prevented, there is a problem that the boundary between the positive and the negative appears clearly as the boundary line 4 as shown in FIG. 7, and this is transmitted from the front surface of the dial plate, and the visibility is lowered.

Therefore, it is an object of the present invention to provide a dot pattern of an illumination adjustment film in an indicating instrument, which can prevent a decrease in visibility due to a boundary line by blurring the positive and negative boundary portions of the dot pattern.

[Structure of Invention]

(Means for Solving the Problem) In the present invention, the dot pattern of the illumination adjustment film is formed by changing the size of dots in the elements of the virtual matrix according to the light blocking rate, and the light blocking rate is defined with a predetermined light blocking rate as a boundary. In the case where the small side is formed positive and the large side is formed negative, in the boundary portion, dots of the same size alternate between positive and negative in a unit element having a plurality of elements with the same vertical x horizontal. It is formed by using a plurality of them.

(Operation) With the above configuration, the positive / negative boundary portion of the dot pattern is blurred by the positive / negative mixed pattern.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention,
The same parts as those in FIG. 7 and FIG. 7 are described with the same reference numerals.

FIG. 2 shows a unit element 5, which is formed from an element 2 having a vertical × horizontal dimension of 2 × 2. Each element 2 is provided with dots 3 of the same size having an area calculated in order to obtain an average light-shielding rate in the range of the unit element 5, and these four dots 3 are alternately positive and negative. Used to construct a positive / negative hybrid pattern.

The positive / negative of the unit element 5 shown in FIG. 2 forms a boundary pattern between the positive and the negative as shown in FIG. 1, for example, a dot pattern with a shading rate of 50% as shown in FIG.

In this way, in the above-described embodiment, since the positive / negative boundary portion is formed by using the positive / negative mixed pattern, there is no boundary line 4 as shown in FIG. 7 and the positive / negative boundary portion is blurred. As a result, it is possible to prevent the boundary portion between the positive and negative from being seen through from the front surface of the dial during illumination of the indicating instrument. In the positive / negative mixed pattern, since dots 3 of the same size are formed alternately in the positive / negative in the unit element 5 consisting of 2 × 2 vertical and horizontal elements 2, The light-shielding rate is uniform, and there is no problem in making the illuminance uniform. Moreover, in FIG.
4 dots 3 of the same size are formed positively in the unit element 5 in the 48% area, and the unit element 5 is formed in the 52% light-shielding area.
In the figure, four dots 3 of the same size are formed by a negative. However, in addition to the positive / negative mixed pattern, each element 2 may be provided with a dot having a size corresponding to the light blocking rate, and may be arbitrarily selected. Good.

FIGS. 3 and 4 show a second embodiment of the present invention, in which, as shown in FIG. 4, an element 2 of vertical × horizontal × 3 × 3.
The unit element 5A consisting of is used, and the dot 3 is provided in the unit element 5A by alternately using positive and negative as in FIG. Then, using the positive / negative mixed pattern of the unit element 5A, the dot pattern of the boundary portion is constructed in the same manner as in FIG. 1 as shown in FIG. In this embodiment, the area of the positive / negative mixed pattern is wider than that in FIG. 1, so that the boundary portion is more favorably blurred.

FIG. 5 shows a third embodiment of the present invention. In this example, a unit element 5B composed of an element 2 having a vertical × horizontal dimension of 4 × 4 is used, and two dots 3 are included in the unit element 5B. The positive and negative electrodes are alternately provided one by one, and the same effect as that of the above-described embodiment can be obtained by using this positive / negative mixed pattern.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the size of the unit element may be appropriately selected, and the positive / negative mixed pattern is formed at a predetermined light blocking rate which is the boundary portion between the positive and negative, and is also formed at the light blocking rate before and after this. May be.

〔The invention's effect〕

The present invention provides a dot pattern of an illumination adjustment film that can prevent the deterioration of the visibility due to the boundary line by forming the boundary portion between the positive and negative of the dot pattern by a positive / negative mixed pattern and blurring the boundary portion. can do.

[Brief description of drawings]

FIGS. 1 and 2 show a first embodiment of the present invention.
FIG. 3 is a schematic explanatory view showing a dot pattern, FIG. 2 is a schematic explanatory view showing a positive / negative mixed pattern of unit elements, FIGS. 3 and 4 show a second embodiment of the present invention, and FIG. FIG. 4 is a schematic explanatory view showing a dot pattern, FIG. 4 is a schematic explanatory view showing a positive / negative mixed pattern of unit elements, and FIG. 5 is a schematic explanatory view showing a positive / negative mixed pattern showing a third embodiment of the present invention. FIG. 6 and FIG. 7 are schematic explanatory views showing conventional dot patterns. 1 ... Virtual matrix 2 ... Element 3 ... Dot 5, 5A, 5B ... Unit element

Claims (1)

[Claims] 1. A dot pattern of an illumination adjusting film formed by printing on a dial for equalizing the illuminance of the dial when illuminating an indicating instrument, wherein a dot size within an element of a virtual matrix is used as a shading rate. According to the present invention, a plurality of elements having the same vertical × horizontal part are formed in the boundary portion in which the small side of the light blocking rate is formed as a positive and the large side is formed as a negative with the predetermined light blocking rate as a boundary. A dot pattern of an illumination adjustment film in an indicating instrument, wherein a plurality of dots of the same size are formed in a unit element having the same by alternately using positive and negative.