JPS5841554B2 - code reader - Google Patents

Description

[Detailed description of the invention] This invention relates to improvements in code reading devices.

In a code reading device using a code plate, for example, an electronic scale, as shown in FIG. is applied to the data reader 14 to read the data at the rest position of the code plate 11, which is processed in the usual manner and displayed in decimal notation.

As an example of the code plate 11 is shown in FIG.
It has a data code of multiple tracks (15 tracks in the illustrated example) consisting of a light-shielding part (dark part) 15 and a light-transmitting part (bright part) 16, and the light-shielding part 1 of this data code is divided in units of 1 g.
5 and the pattern of the light shielding part 16 are different.

The illustrated part is an enlarged data code from 720g to 739.9, and the code plate 11 moves in the left-right direction in the figure according to the weight of the article.

In the example shown, a unit of 1000g is two tracks TI
, T2, and a unit of 100 g consists of four tracks T3, T4.

T5, T6. The unit of 10g is four 1-rack T7°T8. T9. T10, and the unit of 1 g is five tracks T11. T12. T13. It is expressed as T14°T15.

The light from the light source 10 strikes the code plate 11 in FIG. 2 at right angles and as a linear beam that extends over the entire thickness of the code plate (spreading in the vertical direction).

On the other hand, the data reader 14 includes a slit plate 17 having a number of slits 1-81 to 815 (15 in this example) corresponding to each track T1 to T15 of the code plate 11, and a photo sensor arranged corresponding to each slit. It is composed of a transistor 18.

The output signal from phototransistor 18 is applied to a first code converter (not shown), which converts the code plate data into a binary coded decimal number.

The output signal from the first code converter is sent to a register (not shown) and then fed to a second code converter (not shown), which converts the binary coded decimal number into a decimal number. .

The decimal signal from the second code converter is fed to a display tube for visual display.

In this way, the weight of the article measured by the electronic scale is displayed.

In such a conventional code reading device, light from a light source passes through the code plate 11 as shown by line A-A' in FIG.
A stable reading condition can be obtained when the data code is between the boundaries of the data code. When the boundary line is in the boundary line, even if a slight displacement occurs in the code plate 11 (a slight movement in the horizontal direction in the figure), the read data fluctuates between the content before and the content after the boundary line.
Therefore, there is a drawback of causing an unstable reading state.

For example, when an item is placed on an electronic scale, the scale is unstable for a short period of time, so
When the weight of the article is on or very close to the above-mentioned boundary line, there is a drawback that the display flickers.

For example, in the case of an article whose weight is on the B-B' line, 732g and 733g are alternately displayed on the display tube many times, giving a bad impression to the purchaser.

This invention was made in order to eliminate such drawbacks, by adding an auxiliary code to the data code that does not include the boundary of the data hood, and only when the auxiliary code is illuminated, the data on the code board is displayed. A code reading device configured to read a code is provided.

The following is a third example of an example in which this invention is applied to an electronic scale.
This will be explained in detail with reference to the drawings.

However, it goes without saying that the present invention can be applied to other code reading devices other than electronic scales.

In FIG. 3, reference numeral 20 is an enlarged part of a code plate having a plurality of 1-rack data codes, which is composed of a light shielding part 21 and a light shielding part 22. As in the case of FIG. 15 data tracks T1 to T15
and the illustrated portion is the data code from 720g to 739g.

In the present invention, the code plate 20 having such a structure is provided with an auxiliary code, that is, a timing code 23 made of a transparent part that does not include the boundaries of the minimum unit data code, corresponding to each minimum unit data code, and the timing code The timing code is configured such that data on the code plate corresponding to the timing code is read only when the timing code 23 is illuminated by light.

The timing code 23 can be formed as a timing code plate by forming a part of the code plate 20, for example along one side edge as shown in the figure, or can be formed separately from the code plate 20 and used as a timing code plate. good.

The timing codes 23 are provided corresponding to the minimum unit of data code, 1g in this example, have a length slightly shorter than the length of the minimum unit data code, and include the boundary of the minimum unit as shown in the figure. It is placed in a state where there is no.

Since the present invention is configured as described above, the timing code plate has a small area before and after (left and right in the figure) the boundary of the minimum unit of the data code as the light shielding part 21, and therefore the boundary of the minimum unit of the data code. The data does not change at the point when the limit is exceeded, and the data changes only when the boundary of the minimum unit of the data code is sufficiently crossed.

For example, if the weight of the article is measured on the boundary line of the data code indicated by line DD' in FIG.
Since the timing code 23 is not exposed to light, new data (732g) cannot be read, and therefore the previous data (732g) cannot be read.
1g) remains displayed.

Therefore, even if the code plate 20 moves slightly from side to side, data does not fluctuate, and therefore the data display does not flicker.

As described above, according to the present invention, it is possible to read data extremely stably simply by providing an auxiliary code, and therefore the effect is remarkable when applied to code reading devices such as electronic scales.

In the above embodiment, the present invention is applied to an electronic scale, but it goes without saying that similar effects can be obtained when applied to other data reading devices using similar code plates.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically illustrating an example of a conventional code reading device, FIG. 2 is a plan view showing an enlarged example of the code plate shown in FIG. 1, and FIG. 3 is a code reading device according to the present invention. FIG. 2 is a schematic plan view showing an example of a code plate and an auxiliary code used in the device. In the figure, 20 is a code plate, 21 is a light shielding part of the code plate, and 22
is the transparent part of the code plate, T1-T15 is the data track,
23 is an auxiliary code.

Claims (1)

[Claims] 1. An auxiliary code that does not include data code boundaries is provided corresponding to each data code, and the data code can be read only when a signal from the auxiliary code is present. Code reader.