JP4892986B2 - ID code reading method - Google Patents

Description

  The present invention relates to a method for reading an ID code formed on an end portion of a transparent substrate.

  Necessary for reading when a two-dimensional ID code printed on a transparent substrate product or member is read by a CCD camera at an appropriate time in each process, and the production process history is managed with the ID code. LED illumination is used as a light source for obtaining a sufficient amount of light.

  The apparatus has a structure in which a reading device such as a CCD camera is disposed above, an illumination light source such as LED (light emitting diode) illumination is disposed below, and the image is captured by the CCD camera through the transmission part of the object to be inspected. It is general (refer patent document 1).

  The LED illumination will be described below. The LED illumination as a backlight has a direct structure disposed on the back surface of the object to be inspected, and is composed of a light guide plate having a wedge-shaped cross section and a linear light source provided on the back surface of the light guide plate. Yes. For example, LEDs arranged in a linear shape are used as the linear light source. Then, by diffusing the LED light of the linear light source incident on the light guide plate, uniform light is emitted over the front surface of the light guide plate.

  In an illumination light source device (hereinafter referred to as illumination device), for example, a linear light source LED serving as a backlight of a liquid crystal display panel itself, a light guide plate such as a scattering layer, and a reflection plate are combined. Thickness that is equal to or greater than that of equipment is generally used, and ultra-thin lighting equipment is not used.

  When LED illumination is used as a light source, there is a problem that the LED illumination device itself is thick, and it is impossible to read a two-dimensional code because the LED illumination device cannot be installed in a gap narrower than the illumination device itself. The LED lighting device itself has a thin thickness of about 5 mm, and the LED lighting device cannot be used in a gap of 5 mm or less.

  FIG. 4 is a cross-sectional side view of a conventional ID code reading method apparatus. In the conventional apparatus, a light source for illumination is disposed on the apparatus base 30, and a CCD camera 20 of a solid-state image sensor for reading is disposed above the illumination light source 10 so as to face the illumination light source. A stage 3 for placing a transparent substrate is disposed in the gap, and a function of reading the ID code 2 formed on the transparent substrate on the stage is provided.

  In FIG. 4, there is an LED illumination light source 10 below the transparent substrate 1, and a considerable amount of space is required for the installation of the illumination light source. That is, in the case of an LED illumination light source, it is necessary to secure a space of 5 mm or more. When the apparatus becomes large and a space cannot be secured below the transparent substrate, the LED illumination light source cannot be arranged, and the ID code may not be read. In the conventional apparatus, one transparent substrate is inserted into the apparatus and the ID code is read for each transparent substrate. In the method of reading the ID code, it is necessary to carry out and carry in the transparent substrate from the cassette, which increases the time.

Generally, the transparent substrate is stored in a cassette. In the cassette, the transparent substrates are stored in a state where they are stacked in the horizontal direction, or stored in a state in which they stand vertically. The transparent substrate stored in a state of being stacked in the horizontal direction is placed through a step projecting on the side of the cassette, and stored in a manner in which the transparent substrate and the transparent substrate are not in contact with each other. The transparent substrates stored in the vertical state are stored in such a manner that the bottom plate of the cassette is provided with a concave groove, the transparent substrate is inserted into the groove, and they are in non-contact with each other in the upright state. There is a demand for a reading method in a state of being stored in a cassette.

  There are changes in the status of production methods such as the enlargement of the transparent substrate and the expansion of the range of use of the cassette, and the frequency of ID code reading increases. Therefore, it is desired to reduce the size of ID code readers and simplify the reading method. Has been.

The known literature is described below.
JP 2005-201646 A

  An object of the present invention is to read an ID code including a two-dimensional code printed on a product, a member, or the like at an appropriate time of each process, and to manage a production process history with the ID code. An ID code reading method that enables reading of ID codes printed on a transparent substrate or member arranged in a narrow gap or by placing a light source for obtaining a sufficient amount of light into a thin sheet shape It is to be.

The invention according to claim 1 of the present invention reads an ID code formed on an end of each transparent substrate in a cassette in a state where a plurality of transparent substrates are laminated or stand in a non-contact state. a method, so that the state I clamping the end portion of the transparent substrate for reading the ID code in the thin sheet light source and the prism mirror reflection portion, putting a thin sheet light source and the prism mirror reflection portion between the transparent substrate, sandwiched the The ID code reading method is characterized in that the ID code of the substrate is read by a reading device comprising a solid-state imaging device provided with a prism mirror reflecting portion .

  The invention according to claim 2 of the present invention is characterized in that the thin sheet light source is an elk luminescence panel (EL panel), and an ID code is read using the EL panel as a light source. ID code reading method.

  In the invention according to claim 3 of the present invention, the thin sheet light source has a thickness of 0.15 to 1.5 mm and is a plate-like or flexible sheet-like elk luminescence panel (EL panel). 3. The ID code reading method according to claim 1, wherein the ID code reading method is provided.

  By using the ID code reading method of the present invention, it is possible to read the ID code with a narrow gap in the cassette, and it is possible to provide an ID code reading method for efficiently reading the ID code with an easy method.

  By using the ID code reading method of the present invention, it becomes possible to read the ID code with a narrow gap in the cassette, and each cassette containing a transparent substrate is inserted into the apparatus to read the ID code. This eliminates the need to carry out and carry in the transparent substrate, greatly reducing the reading time.

  The ID code reading method of the present invention will be described below based on an embodiment.

FIG. 1 is an explanatory diagram of an embodiment of the ID code reading method of the present invention. The transparent substrate 1 is stored in such a manner that the bottom plate of the cassette 50 stands in a vertical direction and the transparent substrate is inserted into a concave groove with the bottom plate of the cassette placed in a non-contact state. Above that, a CCD camera 20 of a solid-state imaging device is arranged, and a light source of an EL panel 11 of a thin sheet light source is also arranged in parallel. In the reading device 25 composed of the CCD camera 20 and the EL panel, the distance between the CCD camera 20 and the EL panel is adjusted to the same distance as the distance between the transparent substrates, and the horizontal movement 22 in the parallel direction is made parallel to the substrate surface. A function of vertical movement 23 is provided. A CCD mirror 20 is provided with a prism mirror reflecting portion 21 at the tip of the CCD camera 20 so as to reflect an image by 90 degrees with a prism mirror or the like, and is devised to cope with a narrow interval.

  A method for reading the ID code 2 formed on the end of the transparent substrate will be described. The transparent substrate 1 is forested through a narrow gap and stored in the cassette 50, and the ID code 2 of the transparent substrate 1 is disposed between the light source of the thin panel light source EL panel 11 and the tip of the CCD camera 20 of the solid-state image sensor. It arrange | positions so that a formation edge part may be pinched | interposed. The ID code 2 is stopped in this state in a state where the front end of the CCD camera 20 is at the front position and the EL panel light source 11 is at the back position, and an ID code pattern of transmitted light is imaged. Next, the data content of the ID code 2 is read by a method of data processing and extraction from the image data. Next, the front ends of the EL panel light source 11 and the CCD camera 20 are moved up and down from the inner side of the transparent substrate to the outer side of the transparent substrate by the vertical movement 23, and after moving to the left and right are moved 22 to the outer side of the transparent substrate. By moving up and down 23 from the outside of the transparent substrate to the inside of the transparent substrate, the ID code pattern inside the transparent substrate is stopped at the imaging position, and then the ID code pattern of the transmitted light is imaged. This is an ID code reading method in which the operation is repeatedly executed.

  FIG. 2 is a sectional side view of an embodiment of the ID code reading method of the present invention.

  FIG. 2 is a cross-sectional side view of an apparatus for reading an ID code of the present invention. The apparatus of the present invention is an optimum reading apparatus when the arrangement space of the light source for illumination is narrow. As the light source for illumination, an elk luminescence panel (EL panel) was used as a thin sheet light source, and the EL panel was used as a light source.

  As shown in FIG. 2, in the ID code reader, an EL panel 11 serving as an illumination light source is disposed on a pedestal 30, and a solid-state image sensor for reading is positioned at a position facing the EL panel 11 above the EL panel illumination light source. A CCD camera 20 is disposed, a stage 3 on which a transparent substrate is placed is disposed in the gap between the EL panel 11 and the CCD camera 20, and a function of reading the ID code 2 formed on the transparent substrate 1 on the stage 3 is provided. In FIG. 2, there is an illumination light source of the EL panel 11 which is a thin sheet light source on the lower side of the transparent substrate, and if the illumination light source is installed, there is a space of a very narrow gap, for example, a gap of about 0.15 to 1.5 mm. Good. That is, in the case of an EL panel illumination light source, a space of 1.5 mm or less may be ensured. Even when the apparatus becomes ultra-small and only a narrow space can be secured below the transparent substrate, the illumination light source of the EL panel 11 can be arranged and the ID code can be read. In the apparatus of the present invention, one transparent substrate is inserted into the apparatus, and the ID code is continuously read for each transparent substrate, or the transparent substrate stored in a state where it stands in a cassette is provided for each cassette. It is also possible to read the ID code continuously for each transparent substrate.

Also, when storing a transparent substrate in a state of being stacked in a horizontal direction in a cassette, the transparent substrate is placed through a step protruding on the side surface of the cassette, and stored in a manner in which the transparent substrate and the transparent substrate are not in contact with each other. Therefore, in the reading method of FIG. 2, the direction of the CCD camera is arranged so as to be parallel to the EL panel 11, and the leading edge of the EL panel 11 and the CCD camera 20 is sandwiched in the space between the transparent substrates. After the arrangement, the ID code 2 is read. The ID code 2 is the tip of the CCD camera 20 at the upper position and the EL panel light source 11 at the lower position, and stops in this state, and images the ID code pattern of the transmitted light. Next, the ID code 2 is read by a method of processing and extracting from the image data. Next, the front ends of the EL panel light source 11 and the CCD camera 20 move horizontally from the inner side of the transparent substrate to the outer side of the transparent substrate by moving left and right, move up and down to the outer side of the transparent substrate at the next reading substrate position after stopping, The movement horizontally moves from the outside of the transparent substrate to the inside of the transparent substrate, stops the ID code pattern inside the transparent substrate at the imaging position, and then images the ID code pattern of the transmitted light. This is an ID code reading method in which the operation is repeatedly executed.

  FIG. 3 is a sectional side view of an EL panel for illumination used in the ID code reading method of the present invention.

  The thin sheet light source is an EL panel having a thickness of 0.15 to 1.5 mm, a plate shape or a flexible sheet shape, and transparency.

  In the ID code reading method of the present invention, an EL panel is used as an illumination light source. The EL panel will be described below. The EL panel is extremely thin, and its light emitting surface can be arbitrarily divided and blinked. The EL panel has a simple structure, a multilayer structure, and emits light when an AC power supply is applied to the layer. A light guide plate such as a scattering layer or a reflection plate is also unnecessary.

  The EL panel used in the present invention will be described below. FIG. 3 is a side sectional view of the EL panel. In the EL panel 40 shown in FIG. 3, an electrode 42 made of a conductive thin film is formed on a substrate 41 to be supported, a light emitting film 43 in which a fluorescent material is attached to plastic or ceramic is formed thereon, and a conductive film is formed thereon. The counter electrode 44 made of a conductive thin film is laminated and then sealed with a protective substrate 45. An electrode on the support substrate side and a counter electrode on the protection substrate side are formed through an AC power supply 46, and emitted light 47 having a predetermined light intensity is output from the surface on the protection substrate side.

  The supporting substrate 41 and the protective substrate 45 in FIG. 3 are made of transparent glass, and the thickness thereof is 0.5 to 1.0 mm, for example, 0.7 mm, or a resin substrate having flexibility and transparency, For example, a 0.1 mm-thick film is used, and the thickness of the EL panel is optimized by selecting the structure and thickness of the substrate material such as glass and glass, or glass and film, and film and film.

  In the EL panel, a top emission electroluminescence panel (top emission EL panel), a transparent electroluminescence panel (transparent EL panel), and a flexible electroluminescence panel (flexible EL panel) can be used.

  The top emission EL panel is an EL panel substrate in which an anode metal electrode is disposed on a supporting substrate, and a thin film including a light emitting film, an electron injecting protective layer, and a transparent electrode are formed in this order. Next, the EL panel has a layer structure in which the EL panel substrate is sealed with a sealing substrate such as glass. The EL panel has an advantage that light can be extracted from the sealing substrate side.

  The transparent EL panel is an EL panel substrate in which a cathode transparent electrode is disposed on a support substrate, and a thin film including a light emitting film, an electron injecting protective layer, and a transparent electrode are formed in this order on the support substrate. Next, the EL panel substrate is a transparent EL panel sealed with a sealing substrate such as glass. The transparent EL panel has an advantage that light can be extracted from both sides of the sealing substrate side and the support substrate side by using a glass substrate as the support substrate.

The flexible EL panel uses a flexible, transparent resin substrate such as polyethylene terephthalate or PC (polycarbonate) as the substrate, and Si ₃ N ₄ nitride or SiON on the substrate-side electrode of the electroluminescent panel. This is a flexible electroluminescent panel in which a passivation film made of such a ternary compound is formed to form an upper transparent electrode. The characteristics required for the support substrate are materials that satisfy the requirements such as no optical anisotropy, high transparency in the visible light region (400 to 700 nm), good heat resistance, and high flexibility. Any is fine.

  The thin film including the light-emitting film is configured in the order of hole injection film / hole transport film / light-emitting film / electron transport film / electron injection film, the hole injection film side is an anode, and the electron injection film side is It is a structure used as a cathode, and a hole injection film, a hole transport film, an electron transport film, and an electron injection film are appropriately selected and formed as necessary.

  A method for manufacturing the EL panel of the present invention will be described.

In the method for manufacturing an EL panel, when an anode is formed on a supporting substrate, one substrate is vapor-deposited with a metal material such as Au or Cr having a high work function in order to increase the efficiency of hole injection into the hole transport film ( (100 to 150 nm), and a thin hole transport film, a light emitting film, and a protective film are deposited on the film in this order, or a spin coat film is formed (total 100 to 200 nm). Further, an oxide sintered body of In ₂ O ₃ and SnO ₂ is co-sputtered (100 to 200 nm) on the thin film including these light emitting films to form a transparent electrode.

A transparent EL panel is formed by forming an ITO transparent electrode on a support substrate, which is a glass substrate, and depositing or spin-coating (100 to 200 nm in total) a hole transport film, a light-emitting film, and a protective film on the substrate. Furthermore, an oxide sintered body of In ₂ O ₃ and ZnO is formed on the thin film including these light emitting films by sputtering (ZnO target particle film—10 to 30 nm, In ₂ O ₃ target particle film—120 to 140 nm, total 150 nm). Then, a transparent electrode is formed.

  Examples of the light emitting film include quinolinol complexes represented by tris (8-quinolinol) aluminum (Alq3), polyparaphenylene vinylene (PPV) and polyfluorene (PF) which are π-conjugated polymers.

The film formation method of the transparent electrode is a film formation method of a sputtering method using an oxide sintered body mainly made of indium oxide as a target, and the flow rate ratio of Ar and O ₂ as a process gas is set to 20/1 to 300/1. And a film formation method under process conditions in which the pressure at the time of gas introduction is set to 0.05 to 3.0 Pa.

  In the transparent electrode film forming method, the resistance value of the obtained transparent electrode film is preferably 20 to 50Ω / □. The light transmittance in visible light is preferably 95% or more so as not to reduce the light extraction efficiency.

It is side sectional drawing of one Example of the ID code reading method of this invention. It is side sectional drawing of one Example of the ID code reading method of this invention. It is a sectional side view of the EL panel of the thin sheet light source of this invention. It is side sectional drawing of one Example of the conventional ID code reading method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... ID code 10 ... Illumination light source 11 ... EL panel 20 ... CCD camera 21 ... Reflection 22 such as prism mirrors ... Left / right movement 23 ... Vertical movement 25 ... Reading device 30 ... Base 40 ... EL panel 41 ... Support substrate 42 ... conductive electrode film 43 ... luminescent material 44 ... conductive counter electrode film 45 ... protective substrate 46 ... power supply 47 ... emitted light 50 ... cassette

Claims (3)

In the cassette, in a state in which a plurality of transparent substrates in a non-contact state is laminated or forest, a method of reading the ID code formed on an end portion of the transparent substrate of each sheet, the transparent substrate for reading the ID code like the end becomes a state I sandwiched a thin sheet light source and the prism mirror reflection portion, putting a thin sheet light source and the prism mirror reflection portion between the transparent substrate, the ID code of the sandwiched substrate, a prism mirror reflective portion An ID code reading method comprising: reading with a reading device comprising a solid-state imaging device provided .   2. The ID code reading method according to claim 1, wherein the thin sheet light source is an elk luminescence panel (EL panel), and an ID code is read using the EL panel as a light source.   The thin sheet light source is an elk luminescence panel (EL panel) having a thickness of 0.15 to 1.5 mm, having a plate shape or a flexible sheet shape, and having transparency. The ID code reading method according to claim 1 or 2.

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