JPH0731070B2 - 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 printed and formed on a dial in order to equalize 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) In an indicating instrument, an illumination adjusting film is formed by printing on the rear surface of the dial in order to make the brightness of the display portion of the dial uniform during illumination. 48-1735
It is known from Japanese Patent Application Laid-Open No. 4 and No. 4 and a method of manufacturing an illumination adjusting film is known from Japanese Patent Application Laid-Open Nos. 60-123728 and 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. The dot pattern of this illumination adjustment film is 1 in each element of the virtual matrix.
It is configured by providing individual dots and changing the size of the dots according to the light blocking ratio.

(Problems to be Solved by the Invention) As described above, when the entire dot pattern is formed by positive, the dot becomes large at a place where the light blocking rate is large, and the dot 3 may be seen through from the front surface of the dial during illumination. . Therefore, in order to prevent this, as shown in FIG. 4, one dot 3 is provided in each element 2 of the virtual matrix 1, and the dot on the lower side of the light blocking rate is positive with the predetermined light blocking rate, for example, 50% as a boundary. Also, a means for forming the large dots by a negative may be considered.

However, in the means in which the size of the dot 3 in each element 2 of the virtual matrix 1 is changed in accordance with the light blocking rate, both ends of the light blocking rate, that is, 0% or 10
The dots near 0% become very small, and when this is printed on the dial by screen printing, there is a problem that the dot 3 part will be blurred or crushed and hinder the uniformity of brightness. . For example, when the dots 3 are formed as positive or negative, the dot diameter is about 0.2 mm, which is the limit of printing. Since dots smaller than this are difficult to print, the illuminance at both ends of the shading rate is uniform. Was difficult.

Therefore, it is an object of the present invention to provide a dot pattern of an illumination adjusting film in an indicating instrument, which makes it possible to make the lightness uniform at both end portions of the shading rate.

[Structure of the Invention] (Means for Solving the Problem) The present invention provides a virtual matrix in which the dot pattern of the illumination adjustment film formed by printing on the dial in order to make the brightness of the dial uniform when the indicator is illuminated. In the element formed by changing the size of dots in the element according to the shading rate, the dot pattern has the same size dot in a unit element having a plurality of vertical x horizontal elements. A first unit pattern provided for each of a plurality of elements, and a second unit in which the smallest dot in the dot pattern is provided in the unit element and the number of dots is smaller than that of the first unit pattern. And a pattern.

(Operation) With the above configuration, the lightness is made uniform by reducing the minimum number of dots in the dot pattern having the printable size at both end portions of the light blocking rate.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
The same parts as those in FIG. 4 are designated by the same reference numerals and the description of the same parts will be omitted.

FIG. 3 shows the first unit pattern 4. This unit pattern is defined as a unit element 2A which is a range of elements 2 of vertical × horizontal 2 × 2, and within this unit element 2A, the unit element 2A is included. Each element is provided with a dot 3A of the same size having an area calculated so as to obtain four dots having a light-shielding rate of 4 in the range. Then, the dot pattern in the printable range is configured using the first unit pattern 4. For example, if the vertical dimension of the unit element 2A is 1.33 mm × 1.33 mm, the diameter of the dot 3A 'in the positive light-shielding rate 8% portion is 0.213 m.
Since the diameter of the dot 3A 'in the area where the light-shielding rate is 86% and the size is negative is 0.281 mm, this is the smallest dot in this dot pattern, and the light-shielding rate is 8% to 86%.
Is the printable range. The range in which printing is difficult is configured by using the second unit pattern 4A described below.

FIG. 2 shows a second unit pattern 4A, which is formed by using the smallest dot 3A ′ in the first unit pattern 4, and the dot 3 in the unit element 2A.
It is constructed by reducing the number of A '. In other words, by setting the number of dots 3A 'in the unit element 2A to 3, the light blocking ratios of 6% and 89% are obtained, and by setting it to 2, the light blocking ratios of 4% and 93% are obtained, and one dot is obtained. By 2%
You can get 97%.

In this way, the dot pattern of the printable range is formed using the first unit pattern 4 shown in FIG. 3, and the dot pattern of the range difficult to print using the second unit pattern 4A shown in FIG. By constructing the dot pattern, the dot pattern having the range of 0 to 100% of the light blocking ratio shown in FIG. 1 can be obtained.

As described above, in the above embodiment, the printable range is configured by the first unit pattern 4 having four dots 3A of the same size in the unit element 2A, and the printable range is set in the unit element 2A.
Since it is composed of the second unit pattern 4A having the minimum number of dots 3A 'of 3, 2 or 1, the dots in the portions close to both ends of the shading rate are not blurred or crushed and It is possible to reliably obtain the range of 0 to 100%.

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 or the number of dots in the unit element in the first unit pattern may be appropriately selected.

[Advantages of the Invention] According to the present invention, the dot pattern of the illumination adjusting film formed by printing on the dial for equalizing the brightness of the dial when the indicator is illuminated illuminates the size of the dots in the elements of the virtual matrix. In what is formed by changing according to the light-shielding rate, the dot pattern is formed by providing dots of the same size for each of the plurality of elements in a unit element having a plurality of elements with the same vertical × horizontal dimension. 1 unit pattern and a second unit pattern in which the smallest dot in the dot pattern is provided in the unit element and the number of dots is smaller than that of the first unit pattern. It is possible to provide the dot pattern of the illumination adjustment film in the indicating instrument that makes it possible to make the lightness uniform at both end portions of the shading rate.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic explanatory view of a dot pattern, FIG. 2 is a schematic explanatory view of a second unit pattern, and FIG. 3 is a first unit pattern. And FIG. 4 is a schematic explanatory view of a conventional dot pattern. 1 ... virtual matrix 2 ... element 2A ... unit element 3A ... dot 3A '... smallest dot 4 ... first unit pattern 4A ... second unit pattern

Claims (1)

[Claims] 1. A dot pattern of an illumination adjusting film formed by printing on a dial to equalize the brightness of the dial when the indicator is illuminated, and the dot size within the elements of the virtual matrix is used as a shading rate. A unit in which the dot pattern has a plurality of elements having the same vertical × horizontal dimension, and dots of the same size are provided for each of the plurality of elements An instruction comprising a pattern and a second unit pattern in which the smallest dot in the dot pattern is provided in the unit element, and the number of dots is smaller than that in the first unit pattern. The dot pattern of the illumination adjustment film on the instrument.