CN2480915Y

CN2480915Y - Light filter structure for bar-code scanner

Info

Publication number: CN2480915Y
Application number: CN 01238982
Authority: CN
Inventors: 张玉君
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-23
Filing date: 2001-04-23
Publication date: 2002-03-06
Anticipated expiration: 2011-04-23

Abstract

A light filter structure for bar-code scanner is characterized in that: the light filter structure comprises a glass layer, a first light filter layer plated on the outer surface of the glass layer and a second light filter layer plated on the inner surface of the glass layer; the bar-code image light of articles is reflected through the first light filter layer and the second light filter layer to filter stray light, making the light entering into a prepositive device purely red, so as to make the sensing mechanism inside the prepositive device capable of reading bar-code image light accurately.

Description

The optical filtering structure of bar code scanner

The optical filtering structure of the relevant a kind of bar code scanner of the utility model refers to a kind of optical filtering structure with barcode image light that double filtration article bar code reflected especially.

Known, bar code scanner includes at present: a front device and a rearmounted device constitute, in order to scan and to read the bar code on the article.This front device roughly is made of one scan mechanism, a light source cell, an optical filtering mechanism and a sense mechanism, the aforementioned lights source unit is projected to light on the scanning mechanism, the light that light source cell throwed is reflexed on the bar code of article by scanning mechanism again, the image light that bar code reflected is then promptly received by sense mechanism after the optical mechanism optical filtering is handled after filtration, behind the light that the sense mechanism processing is received, change electric signal output into; And the electric signal that the inner set above-mentioned sense mechanism of processing of circuit of rearmounted device is exported is known scanned which kind of article that are to declare.

Because bar code scanner is during to bar code scan, the circuit gated sweep degree of accuracy all easily of the scanning mechanism of this front device, light source cell, sense mechanism and rearmounted device inside, but having optical filtering mechanism only is not easy in the control of image light filtration treatment, because the handled light of optical filtering mechanism not only will filter the image light that bar code reflects, the also essential veiling glare that filters some contexts, if this veiling glare filters incomplete or sordid words, to cause the interpretation out of true or the erroneous judgement of scanning machine, perhaps can't interpretation.

So the dealer has just proposed the design of multiple optical filtering mechanism, solve the disappearance that bar code scanner filters.First kind of optical filtering mechanism (as shown in Figure 1) formed by the optical filtering 2A that a red acryl 1A and is affixed on the sense mechanism 3A, this red acryl 1A can only allow red light pass through, by the veiling glare of being carried secretly in the optical filtering filter red light, receive by sense mechanism 3A more again;

This second kind of optical filtering mechanism (as shown in Figure 2) is by a red acryl 1B and paste an optical filtering 2B formed on red acryl 1B, aforesaid red acryl 1B can only allow red light pass through, by the veiling glare of being carried secretly in the optical filtering filter red light, receive by sense mechanism 3B more again;

This third optical filtering mechanism (as shown in Figure 3) is by a red acryl 1C, the one optical filtering 3C that the filter layer 2C and of plating one deck multilayer film is attached on the sense mechanism 4C on red acryl 1C inside surface forms, aforesaid red acryl 1C can only allow red light pass through, the veiling glare of being carried secretly in the filter red light one by one by filter layer 2C again, after refiltering once by optical filtering 3C again, promptly receive by sense mechanism 4C;

The image light time that the article bar code is reflected is being filtered by aforementioned three kinds of optical filtering mechanisms, all can't filter the veiling glare of being carried secretly in the image light effectively, and this veiling glare also is trapped in front device inside easily, it is incorrect to cause sense mechanism to read, maybe can't read, perhaps read error, and this optical filtering mechanism of three kinds also is not easy on making, and cost of manufacture increases relatively.

Fundamental purpose of the present utility model is to solve above-mentioned disappearance, avoids disappearance to exist, and a kind of optical filtering structure of bar code scanner is provided, and this optical filtering is constructed not only veiling glare filtration totally, and easy to make, can reduce cost of manufacture significantly.

In order to achieve the above object, the utility model filters structure by a glassy layer, and one deck is plated on first filter layer of aforementioned glassy layer outside surface and second filter layer that one deck is plated on aforementioned glassy layer inside surface constitutes.When the barcode image light of article reflexes to first filter layer, this first filter layer can filter the veiling glare of being carried secretly in the image light one by one, only allow red light pass through glassy layer, after red light is passed through glassy layer, enter second filter layer again, this second filter layer does not filter clean veiling glare with first filter layer once more and filters once more, allows the light that enters into front device inside be pure red light, so that the sense mechanism of front device inside can accurately read.

The purpose of this utility model is achieved in that

The characteristics of this optical filtering structure are that the outside surface at a glassy layer is coated with first filter layer and the glassy layer inside surface is coated with second filter layer, and this first filter layer and second filter layer only allow red barcode image light pass through.

This glassy layer is constituted by a clear glass.

This first and second filter layer is a multilayer film.

Relevant technology contents of the present utility model and structure now are described in detail as follows with regard to conjunction with figs.:

Fig. 1, known bar code scanner optical filtering organigram.

Fig. 2, another known bar code scanner optical filtering organigram.

Fig. 3, a known bar code scanner optical filtering organigram again.

Fig. 4, bar code scanner of the present utility model filter and construct partial schematic sectional view.

Fig. 5, bar code scanner of the present utility model filter and construct elevational schematic view.

Fig. 4, Fig. 5 are respectively bar code scanner optical filtering structure broken section of the present utility model and elevational schematic view.As shown in the figure: the optical filtering structure of bar code scanner of the present utility model, this bar code scanner includes: a front device 1 and a rearmounted device 2 constitute, in order to scan and to read the bar code on the article.

Above-mentioned front device 1 roughly includes: one scan mechanism (not shown), a light source cell (not shown), an optical filtering mechanism 3 and a sense mechanism 4 constitute, the aforementioned lights source unit is projected to light on the scanning mechanism, the light that light source cell throwed is reflexed on the bar code of article by scanning mechanism again, the image light 5 that bar code reflected is then promptly received by sense mechanism 4 after optical mechanism 3 optical filterings are handled after filtration, after sense mechanism 4 is handled the light that is received, change electric signal output into; And the electric signal that the inner set above-mentioned sense mechanism 4 of processing of circuit of rearmounted device is exported, and declare and know scanned which kind of article that are.

Because bar code scanner is during to bar code scan, the circuit gated sweep degree of accuracy all easily of the scanning mechanism of this front device 1, light source cell, sense mechanism 4 and rearmounted device 2 inside, but having optical filtering mechanism 3 only is not easy in the control of image light source 5 filtration treatment, because optical filtering mechanism 3 handled light not only will filter the image light 5 that bar code reflects, the also essential veiling glare that filters some contexts, if the veiling glare of this environment filters incomplete or sordid words, to cause the interpretation out of true or the erroneous judgement of scanning machine, perhaps can't interpretation.

Optical filtering structure 3 of the present utility model includes: a glassy layer 31, one deck is plated on first filter layer 32 of aforementioned glassy layer 31 outside surfaces and second filter layer 33 that one deck is plated on aforementioned glassy layer 31 inside surfaces constitutes, aforementioned glassy layer 31 is the long characteristic glass of an all-wave, can allow red light (the image light that bar code reflected) 5 all pass through;

This first and

second filter layer

32,33 is that a multilayer film is plated on above-mentioned glassy layer 31 surfaces externally and internallies, the veiling glare of can filter red light source 5 one by one being carried secretly, and only allow red light pass through;

When bar code scanner scans the bar code of article, the light source cell of scanning machine inside can be projected to light on the scanning mechanism, scanning mechanism is projeced into this light on the bar code of article more then, after the bar code of article is subjected to rayed at this moment, the image light (red light) 5 that is produced reflexes on the optical filtering structure 3 of scanning machine immediately, at image light 5 during through first filter layer 32, this first filter layer 32 can filter the veiling glare that the image light 5 that bar code reflected is carried secretly one by one, only allow the ruddiness of image light 5 pass through, ruddiness after filter through first filter layer 32 this moment can pass through glassy layer 31 completely, enter second filter layer 33 again, and the veiling glare that this second filter layer 33 does not filter first filter layer once more fully filters again, allow veiling glare filter fully totally, therefore entering the preceding device of scanning machine inside is a fully very clean ruddiness, allow front device inside not have the existence of veiling glare, even how this ruddiness reflects in front device 1 inside, this sense mechanism 4 is sensing all accurately.

Further, the utility model inside and outside surface on glassy layer 31 plates the

filter layer

32,33 that one deck can successively filter image light, enters into front device 1 inside except preventing veiling glare, allows the producer be easier to make, and also can reduce cost of manufacture significantly.

Claims

1. the optical filtering of a bar code scanner is constructed, it is characterized in that this optical filtering structure (3) is that outside surface at a glassy layer (31) is coated with first filter layer (32) and glassy layer (31) inside surface is coated with second filter layer (33), this first filter layer (32) and second filter layer (33) only allow red barcode image light pass through.

2. the optical filtering of bar code scanner according to claim 1 structure is characterized in that this glassy layer (31) is constituted by a clear glass.

3. the optical filtering of bar code scanner according to claim 1 structure is characterized in that this first and second filter layer (32,33) is a multilayer film.