JPH076837U - Bar code reader reading window - Google Patents

Abstract

(57) [Abstract] [Purpose] The reading port can be sealed without using a transparent member, and the number of optical components can be reduced. As a means for sealing the reading window 1A, a lens 2 having a function of a light projecting lens or an image forming lens is used to directly seal the reading window 1A. It is not necessary and the number of optical components can be reduced accordingly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bar code reader for reading information recorded on a bar code label, and in particular, a bar code reader provided in a housing of the bar code reader for emitting / projecting light from an internal light source to the outside. It's about windows.

[0002]

[Prior art]

 As a barcode reader that optically reads information recorded on a barcode label, for example, the one shown in FIG. 4 is known. The bar code reader causes the reading light emitted from the light source 101 inside the housing 100 to be projected toward the bar code label 102 outside the housing 100, and at the same time, the reading light reflected by the bar code label 102 and returned. A reading port 100A for taking in is opened at the tip of the housing 100. Normally, the reading port 100A is sealed with a transparent member 103 so that dust and the like do not enter the housing 100.

[0003]

[Problems to be solved by the device]

 By the way, in such a bar code reader, in order to surely read the bar code symbol recorded on the bar code label, the reading light incident on the light receiving element 104 is attenuated as much as possible (or light intensity). I like to keep it down. Under these circumstances, it is desirable to use the transparent member 103 that is less likely to reflect or absorb the reading light, but reflection and absorption to some extent cannot be avoided. In view of the above-mentioned circumstances, the present invention can seal the reading port without using a transparent member, reduce the number of optical components, and improve the reading ability. It is intended to provide a reading window of a bar code reader.

[0004]

[Means for Solving the Problems]

 That is, this invention comprises a light source that emits reading light toward a bar code label and a light receiving element that captures the light reflected by the bar code label and returned to the inside, and recorded on the bar code label. In a bar code reader that reads information, as a light projecting lens that focuses the light from the light source toward the bar code label on the reading window where the light read from the light source is projected from the inside of the housing to the outside. And a function as an image forming lens for forming an image of the read light reflected by the barcode label and returning on the light receiving element.

[0005]

[Action]

 In this invention, as the means for sealing the reading window, a lens having a function of a light projecting lens or an image forming lens is used to directly seal the reading window, which does not require the light projecting lens or the image forming lens inside the housing. Therefore, the number of optical components can be reduced accordingly. Further, in this invention, since it is not necessary to use a transparent member merely for the purpose of preventing dust, attenuation of the reading light due to reflection / absorption is suppressed and the reading power is improved.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a bar code reader to which a reading window of a bar code reader according to a first embodiment of the present invention is applied, and a lens 2 having a shape as shown in FIG. 2 is fixed to the reading window 1A. ing. In the figure, reference numeral 1 is a housing, 3 is an LED as a light source, 4 is a charge coupled device (CCD) as a light receiving element, and 5 is a bar code label.

The lens 2 has a light projecting function and an image forming function in addition to a function as a means for sealing the reading window 1A. In this embodiment, the first lens 21 having the light projecting function and the image forming function are provided. And a second lens 22 having These first and second lenses 21 and 22 both have a length L that is substantially the same as the longitudinal dimension of the barcode label 5 to be read, and a thickness that is approximately half the lateral dimension of the barcode label 5. The side surface facing the barcode label 5 and the opposite side surface are formed in a shape having a predetermined intrinsic curvature. The surfaces of the first and second lenses 21 and 22 facing each other are bonded with an adhesive having the same refractive index as that of the first and second lenses 21 and 22.

Therefore, according to the first embodiment, the light projecting lens and the image forming lens are configured so that the first and second lenses 21 and 22 which are also dust-proof means function, so that the inside of the housing 1 It is not necessary to provide these lenses on the housing, and the housing 1 can be downsized and reduced in weight accordingly.

Next, a second embodiment according to the present invention will be described with reference to FIG. The reading window of the bar code reader of the second embodiment shown in FIG. 3 has a substantially prismatic shape, and is composed of first and second lenses 23 and 24, one surface of which faces each other, fixed by an adhesive. Lens 2 is fitted. Similar to the first embodiment, the first and second lenses 23 and 24 also have curved surfaces on the side surface facing the barcode label 5 and the side surface opposite to the side surface. That is, the first lens 23 has a function as a light projecting lens, and the second lens 24 has a function as an image forming lens. As in the first embodiment, the first lens 23 is provided in the housing 1 '. Has not been installed because the conventional projection lens and imaging lens are not required.

In the second embodiment, since the bar code is read by moving and scanning in the direction of arrow α in FIG. 3, the total length W of the first and second lenses 23 and 24 is the bar code label 5. It is possible to use a small size that is approximately the same as the dimension in the lateral direction. Therefore, according to the second embodiment, the width dimension of the housing 1'can be significantly reduced.

[0011]

[Effect of device]

 As described above, according to the present invention, as a means for sealing the reading window, the reading window is directly sealed by a lens having a function of a light projecting lens or an image forming lens, and thus the housing is normally kept. Since a light projecting lens and an image forming lens are not required inside and the number of optical components can be reduced accordingly, it is suitable for reducing the weight and size of the housing. Further, in this invention, since it is not necessary to use a transparent member merely for the purpose of preventing dust, attenuation of reading light due to reflection / absorption is suppressed accordingly, reading power is improved, and a highly reliable bar is provided. A code reader can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment.

FIG. 2 is a perspective view showing a main part of the first embodiment.

FIG. 3 is a schematic perspective view showing a second embodiment.

FIG. 4 is a sectional view showing a conventional barcode reader.

[Explanation of symbols]

 1 Housing 1A Reading Window 2 Lenses 21,23 First Lens 22,24 Second Lens

Claims (1)

[Scope of utility model registration request] 1. The information recorded on the bar code label is provided with a light source that emits reading light toward the bar code label and a light receiving element that receives the light reflected by the bar code label and returned. In a bar code reader for reading, a function as a light projecting lens for condensing light from the light source toward a bar code label in a reading window through which light read from the light source is projected from inside the housing to the outside. And a reading window of a bar code reader, which is sealed with a lens having a function as an imaging lens for forming an image of the reading light reflected by the bar code label and returning on the light receiving element.