JPH04115388A - Recording slip - Google Patents

Abstract

PURPOSE:To surely and accurately read out information by optically detecting the light quantity difference of returned light because almost all light advanced to a groove part between reflecting plates is dispersed/reflected by the reflecting plates and its reflection in an incident direction is sharply dropped. CONSTITUTION:A laser beam (alpha) with a prescribed polarizing face advanced to a prescribed area of the 1st polarizing plate 1 corresponding to the existence part of the reflecting plates 2 is partially absorbed/dispersed/reflected on the 1st polarizing plate 1, partially transmitted and then reached to the plate 2. The transmitted laser beam is reflected on the upper face of the plate 2 with a high reflection factor, reversely advanced again the 1st polarizing plate 1 and returned through the plate 1. On the other hand, a laser beam (beta) transmitted to the groove part 4 having no reflecting plate 2 through the plate 1 is passed through the groove part 4, and since the phase of the incident light is different from the grating phase of a polarizing plate 3 by pi/2, the incident light is dispersed/reflected on the plate 3, so that the reflection of the laser beam (beta) in the incident direction is sharply reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a record sheet that records information regarding various articles, outdoor facilities, individuals, etc.

[Conventional technology]

For example, in order to streamline and save labor in operations such as sales calculations, inventory management, and sorting, various types of information about these items are stored in boxes used to package various products and items for delivery. Bar code labels are affixed and are widely used.

[Problem to be solved]

By the way, such a barcode label is usually made of white paper or the like and has a black bar printed on it. However, this type of barcode label is
For example, if a portion of the bar fades and becomes thin due to the influence of sunlight (ultraviolet rays), there is a risk that the information recorded on the barcode label cannot be read reliably and accurately. As described above, barcode labels that are simply printed with black bars or the like on paper or the like have drawbacks in terms of durability, weather resistance, etc., and are particularly problematic when used outdoors.

In view of the above-mentioned conventional problems, the present invention is capable of recording information reliably and accurately for a long period of time without the risk of reading failures due to fading, etc. The purpose of this is to provide a record sheet from which information can be read.

[Means to solve the problem]

That is, in the record slip of the present invention, the first... a second polarizing plate, and a second polarizing plate having a shape corresponding to recorded information. It is provided with a reflecting plate that is sandwiched between the second polarizing plates and reflects incident light.

[Effect]

In the record slip of this invention, of the light incident on the first polarizing plate, only the light directed toward the reflecting plate is reflected with a high reflectance, and most of the light traveling toward between the reflecting plates is reflected on the second polarizing plate. The light can be transmitted and propagated without being reflected by the reflector, and information can thus be optically read from the difference in the amount of returned light that correlates with the presence or absence of a reflector.

〔Example〕

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

The record slip of the present invention is composed of a first polarizing plate 1, a reflecting plate 2, and a second polarizing plate 3.

The first polarizing plate 1 has a constant transmission axis direction, and in this embodiment has a polarizing plane 1a in the X direction perpendicular to the direction in which the reflection plate 2 is disposed (Y direction). For example, the Lλ of polyvinyl alcohol is A material of a predetermined thickness that has been given dichroism by stretching in the direction to align long chain polymers in the direction is used.

The reflecting plate 2 reflects the incident light toward the upper surface bordering the first polarizing plate 1 with a high reflectance. It is arranged and sandwiched between the second polarizing plates 1 and 3 according to the recorded information, and is made of a plate material such as aluminum (AI) or stainless steel whose upper surface is mirror-finished to increase reflectance. . The reflectors 2 are arranged with a width W and an interval t according to the recorded information, and as shown in FIG.
The groove portion 4 (hereinafter referred to as the groove portion 4) corresponds to the black bar portion of a conventional barcode label, and the reflective plate 2 portion corresponds to the white background portion.

The second polarizing plate 3 is made of the same material as the first polarizing plate 1, but its transmission axis direction is orthogonal to the first polarizing plate 1 in the Y direction, that is, the polarizing plane is aligned along the Y direction. It is configured to have

Therefore, in this embodiment, for example, as shown in FIG.
is emitted toward the first polarizing plate 1.

Then, for example, the first
The laser beam (α
) has a predetermined plane of polarization and is partially absorbed, scattered and reflected by the first polarizing plate 1 and partially transmitted before reaching the reflecting plate 2 . Then, the transmitted laser beam is reflected with a high reflectance on the upper surface of the reflecting plate 2, and then travels backward through the first polarizing plate 1 again, passing through the first polarizing plate 1 and returning.

Further, the laser light (β) that has passed through the first polarizing plate 1 toward the groove 4 where the reflection plate 2 does not exist, after passing through the groove 4,
Since the phase of the incident light and the lattice phase of the polarizing plate 3 differ by π/2, the incident light is scattered and reflected by the polarizing plate 3, and the reflection of the laser beam (β) in the incident direction is significantly reduced.

In this way, the width of the reflector 2 and the groove portion 4 can be optically determined from the difference in the amount of reflected light, which varies greatly depending on the presence or absence of the reflector 2.
The recorded information can be read from these data.

〔effect〕

As explained above, according to the record sheet according to the present invention, of the light incident on the first polarizing plate, only the light directed toward the reflecting plate is reflected with a high reflectance, and the groove between the reflecting plates Most of the light traveling in the opposite direction is scattered and reflected by the second reflector, and the reflection in the direction of incidence is greatly reduced. Therefore, by optically detecting the amount of light of the returning light, information can be reliably and accurately obtained. Unlike conventional barcodes printed with black bars, there is no risk of fading due to sunlight, making them suitable for long-term use outdoors.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing a record slip according to the present invention, and FIG.
The figure is a plan view showing the record slip according to the present invention, and FIG. 3 is an enlarged sectional view showing the operation of the record slip according to the present invention. 1a... Polarization plane, 1.3... 1st. 3rd polarizing plane, 2...reflector.

Claims (1)

[Claims] 1. First lenses arranged with their polarization planes shifted from each other by a predetermined angle
, a second polarizing plate; and a reflecting plate that is sandwiched between the first and second polarizing plates and has a shape according to recorded information, and that reflects incident light. vote.