JPS5933576A - Optical information reader - Google Patents

Abstract

PURPOSE:To read easily various print optical information with high accuracy, by providing plural light emitting means emitting a high luminance light of each emitting wavelength of plural different wavelength regions to a light source so as to eliminate the need for an infrared ray cut-off filter. CONSTITUTION:High luminance red LEDs 1, 1 are emitted with the operation of a changeover switch 12 by arranging a reader to a bar code label 4 printed with a heat-sensing printer. The red light emitted in this way is illuminated on the label 4 through an illuminating lens 3. The image of bar code in the orthogonal direction of each bar is formed on a reading line arranged with photo elements of an image sensor 9 through an optical system comprising a lens 7 and a diaphragm member 8 having different reflection factor according to the white and black bars on the label 4 through the irradiation of light and corresponding distribution of intensity of light to the bar code 5. On the other hand, in reading the bar code printing black bars in black ink on the label 4 colored on blue background, the infrared LEDs 2, 2 are emitted with the switching of the switch 12 and the image of bar code is image-formed similarly on the sensor 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides barcodes printed on recording media such as labels,
Optical If of characters etc.? This invention relates to an optical information reading device that reads N.

In this type of device, a tungsten lamp is used to irradiate illumination light 17 onto a label recording optical information such as a bar code or characters, and an information image is read by the reflected light. imaged on the surface of the eyelids U,
The image is converted into an electrical signal by reading the image using an electronic scanning system.

And, since this tungsten lamp for It(+ brightness produces ltQ bright light with many red 1-wavelength components, it should be printed with JRD's usual carbon-based black ink! - There is no problem when reading information. In the case of information printed by a Q-type printer, the light reflection E of the black background part has an infrared wavelength component of 1lli, making it impossible to distinguish it from the white background part and making it unreadable.

As a countermeasure, the light sensitivity of the 1FFL semiconductor image sensor (91) is high in the infrared wavelength region, so the light sensitivity of the red 1 wave can be compared to the visible light region. Sensitivity decreases, c, J to 1st generation sensitivity,
It has been customary to provide a V11 filter that cuts out infrared wavelength components.

However, when this infrared cut filter is provided, its cutoff property is sufficiently 11°Ii <ζ in the infrared wavelength region, and from near-red I light to visible light n
Although the IJ'ζ is quite low in the visible light range, it does not become zero in the visible light range, so if you make the luminance of the tungsten lamp convex, taking into account the low -1 minute effect due to its filtering effect, However, there were 111 problems in σ month, such as increasing the size of the light source and increasing the amount of heat generated by the light source.

The present invention has been developed in tandem with the above-mentioned problems, and uses an ordinary reading sensor and eliminates the need for an infrared cut filter. 4j and light printed on colored ground? It is possible to read y-related information as well.
I have a target.

Therefore, in the present invention, the electronic scanning type reading sensor is
1 set to the optical 1iY information reading device, 1 set (? 3!
! The light source of the /I light irradiation means is provided with a plurality of light emitting means each emitting high-intensity light of each emission wavelength in a plurality of different wavelength regions.

The following is the theory that misfire 191 is shown in the figure.
91.

Fig. 1 is a partially cutaway diagram of the structure, and ◯ indicates a red light emitting diode with a brightness of 11 used as a light source, and its emission spectrum has a peak value near G 60 nm. 2 is a high-brightness infrared light-emitting diode placed in parallel with the red light-emitting diode I, and its emission spectrum has a peak value around 925 nm. Reference numeral 3 denotes an illumination lens that converges the illumination light from the red light emitting dimer 1 and the red light emitting dimer 2 to make it uniform over a predetermined range. Reference numeral 4 denotes a label of the recording medium, on which a barcode 5 of optical pattern information is printed.

6 is flat jT + 7 reaction force / J gun, baryo 1' Jibel 4J
, and changes the direction of the light by reflecting it. 7 is a lens from Ver. 1-Travel 4, IIJ
The light is focused and passed through the diaphragm member 8 to a predetermined position.
A hard image is formed. Reference numeral 9 denotes an image center as a reading sensor, which has a one-dimensional resolution of 1024 bits by arranging a large number of Fume I-elements in a line, and includes a red light emitting diode '1 and a red light emitting diode 1: It has a spectral sensitivity higher than a predetermined level in a range including a region of 660 nm to 925 nm. , 10 is a hand-held case, and its internal compartment is connected to the data processing device via a signal cable 1j for receiving and receiving various electrical signals.

11 is the switching interval 11δ, and the light source red 1 to light emitting diode 1
, What switches the famous operation of red 1B light da/C ode 2 °
r, EJ game 10; J number et al. 11. It is linked to the switching operation of the switching swing I2, and the 3121st
Electrical connections are made as shown in ζ.

Figure 2 shows the special 1 diagram.・f image Unsa 9
Spectral sensitivity of 1 (1Δ and wavelength distribution of light emitting diode/Code 1) 1. Yee! I: +, + and light emitting diode (m -1'
2's lJ/li'C distribution characteristics 1 (IC and Hari 1-Drabel's Nos. (color) printed with a thermal printer)
This shows the reflectance characteristic C of Jl bar). Here, the emission spectrum distribution of the light emitting diode L2 is 660±30 nm, 1]25±:30 ++m, -, respectively.
Image sensor (1 peak?Ift is 700 nm
This is an example of the information printed by a thermal printer.
According to 14, since the reflectance of black in the infrared region becomes non-1:t, rr, the emission spectrum range of the illumination light from the source is G G fl tl nm wavelength. The area is controlled (IJ and readable by the red light component emitted by the red light emitting diode).

Next, the operation of the above configuration will be explained.

Now, place the reading device hand-held at the position shown in Fig. 1 on the thumb code label 4 printed by the thermal printer.
Place the two high-intensity red light emitting diodes 1 and ■ into the light-emitting state h! Make it. The red illumination light generated by this emission passes through the illumination lens 3 and is irradiated onto the barcode label 4.

Due to this light 11
Set the optical system of the image sensor 9 to iff+.
A code image of each bar in the orthogonal direction is imaged on the reading line where the elements are lined up.

(M means that the barcode is imaged by the electronic scanning reading operation by the electronic control circuit of the image sensor 9.
It is possible to change the luminescence vector of the red luminescent dimer l to 6 G O
Since it is around nm, the reflection characteristics from the part 21-5 printed with a thermal printer (J, '2nd
As shown in Figure 1j11, Barco 1''5 &)
,! The reflectance of the , tl bar is about 40% to 55%, and can be distinguished from the white bar, which has a reflectance of about 100%. At this time, the black bar's anti-JIJ;? As for 4, it is preferable to have a wavelength close to zero, but it is limited to a wavelength range where the sensitivity of the image sensor 9 is less reduced, and red light around 660 nm is the overall most suitable wavelength.

On the other hand, labels colored on a blue or green background 4'' Second,!
When reading a barcode with a Jλ1 bar printed with Jl ink (optical information), similarly place it in the position shown in FIG. As a result, infrared illumination light having a peak value at a wavelength near 925 nm ((J) is emitted. As a result, in this infrared illumination light, the anti-ff =
Since It becomes convex and the reflectance of the black bar becomes I15, a reflected image with a large cost thrust is imaged on the image sensor 9''. Therefore, this image sensor 9
Reading the electronic scanning ('F movement) can convert the bar to 1' image into an electrical signal, and the code can be read.

In this way, each light source that emits two types of light with different wavelengths is used as a barcode ((((Because it is used in light, in addition to a barcode printed with normal ink, a barcode I' printed with a thermal printer is used. can be read, as well as blue,
It is possible to stably read barcodes printed on a green background using IIN/Cink.

Furthermore, since a light emitting diode (,2) with an Irl5 brightness is used as a light source, the light source can be made smaller compared to the case where a Kungsgunfunzo is used. The emission *Jj b"t associated with the light emitting action can also be made very small, and the life of the light source can be extended and its maintenance can be simplified.

Next, FIG. 4 shows another embodiment of the present invention, in which the switching interval +? 811 A switches the connection to the power supply of +V and -■ in conjunction with the operation of the changeover switch 12. Therefore, when the changeover switch 12 is switched to the red side by 1M, the switching interval +1/i 118 is connected to the +V side, and the red light emitting diode 1 of 211^1 is activated to emit light. On the other hand, switch the selector switch ■2 to the infrared side 1
When M is produced, the disconnection Pt1ijlIfδ118 becomes -V side t[t becomes the connection state, and the two red 1 light emitting diodes 2 operate to emit light. According to this configuration ζ, the connection lines to each light emitting diode 1'1.2 can be made common to j1η.

In addition, in the embodiments related to the above, 1. The operation of two types of light emitting diodes, fJ-dore 1.2, is switched automatically depending on whether or not the optical 1+'l+lf can be read. Good too.

In addition, although the light-emitting dilard 1.2 of the 241i was shown in Section 1, in order to eliminate the need for the switching 11 and 18, both the light-emitting diodes (n-1' 1.2) were turned on simultaneously. Nishi'C is also 1: Yes.

Moreover, although the barcode 5 is used as the optical information as an example, it is also possible to use other numbers, characters, etc. as the object.

Furthermore, although a cotton-like one-dimensional image sensor has been exemplified as the C sensor, a planar C-image sensor may also be used.

In addition, although I have illustrated the precept 1) without using a reading device, please move the label 4 to the specified position! It may also be applied to a fixed type reading device.

Furthermore, although two types of emission wavelengths of the light source, near C66 (1 nm and near 925 nm), are used as an example, it is not limited to the two types mentioned in 1. Other wavelengths may also be used. Light emitting means with three or four different wavelengths may be used.

As described above, according to the present invention, a normal reading sensor is used, and the light source is provided with a plurality of light emitting means for emitting fli brightness light of each emission wavelength in a plurality of different wavelength regions. This eliminates the need for an infrared filter.
ζ Optical information printed with normal ink, optical information printed with a thermal printer, and optical information printed on a colored background can be read easily and with high precision.

[Brief explanation of drawings]

FIG. 1 shows a fourth embodiment of the present invention: ;, <゛・l' ty
B-section broken configuration diagram, Figure 2 is the grand view at 11, Figure 3 is Part 1
η (shows the configuration of J'71i #+'j diagram, Fig. 4
It is a p molecule II connection diagram showing the main part of another embodiment of the wooden invention. 1.2... Red light that serves as a light emitting means) ζda・Code. Infrared light emitter, fi-1", 3...) (((lighting,
4... As a recording medium, this barcode label, 5...
・Optical Ti'l? ti's Bayo 1 color 6...T
11-sided reflector, 7... Lens, 8... Aperture 1ili
Material, 9...read sensor, IO...choice, 11...1 horn exchange 1fL
12...Switch switch. Representative Patent Attorney Takashi Okabe 1 Figure 10 Figure 3 Figure 4

Claims (1)

[Scope of Claims] An irradiation means for irradiating light onto optically recorded information to be read; The information image by the reflected light is imaged at a predetermined reading position. 'p+ system and the reading part 1'I-: are arranged on the reading part 1"I-:, and the information image 1 image formed on the surface is transferred to the electronic scanning type I-1".
A-piece operation ゛C Someto element that converts into electric signal is cotton-like:
r, optical t with reading sensors arranged in a vertical configuration;
ri? In the tln1δ extraction device, ζ, 1((((As a light source for the emitting means, a plurality of light emitting means each emitting convex luminance light having a plurality of different wavelengths on top of each other are provided.'t47 Light as a sign? (Target 11 II information reading device.