CN2459672Y - Scan projection light source structure for bar code machine - Google Patents
Scan projection light source structure for bar code machine Download PDFInfo
- Publication number
- CN2459672Y CN2459672Y CN 01210083 CN01210083U CN2459672Y CN 2459672 Y CN2459672 Y CN 2459672Y CN 01210083 CN01210083 CN 01210083 CN 01210083 U CN01210083 U CN 01210083U CN 2459672 Y CN2459672 Y CN 2459672Y
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- CN
- China
- Prior art keywords
- dazzling screen
- bar code
- projection source
- light source
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to a scan projection light source structure for a bar code machine. The utility model comprises a laser dipolar body, a collecting lens positioned in front the laser dipolar body and a first anti-dazzling screen positioned in front of the condensing lens. The utility model is characterized in that a second anti-dazzling screen is arranged in front of the first anti-dazzling screen, the second anti-dazzling screen is provided with a through hole, wherein, both sides of which are provided with shading parts that are opposite and are in an arc-shaped face. The scan projection light source sends out a beam with an arc-shaped cutting edge, and the utility model is the ideal scan projection light source for the bar code machine.
Description
The scanning projection source structure of the relevant a kind of barcode machine of the utility model refers to projection source with arc side cut of a kind of generation especially, when bar code is scanned, can form a desirable projection source.
There is good projection source that desirable scanning result is just arranged.General ray cast hot spot all is to present circle, or it is oval, the bar code major part then is to be printed as strip, if so read bar code reading catoptrical mode with spot scan, so desirable luminous point should be square, or rectangle, take second place and be ellipse, taking second place is circular light spot again, and when the luminous point of approaching more circle passed through bar code with scan mode, its signal that reflects presented similar sine wave, relatively keep off digital signals, under need the condition with width interpretation bar code recently, more undesirable, square or rectangle luminous point be equally with scan mode during by bar code, the resulting signal of its reflected light that reads, present and approach square wave, just, relatively help the interpretation bar code relatively near digital signals.
Second condition is, in order in a scope, to read bar code, we wish the only directional light that throws, and spot size will be suitable for reading our being seen bar code, therefore existing scan-type bar code reader adopts LASER Light Source more, volume because of product is little again, and most product all adopts laser diode again, below is that the unitized construction of light source describes (as shown in Figure 1 and Figure 2) at laser diode:
This laser diode 1, be one to be 30 ° of X-axis with the projection source angle, 10 ° of elements that project ellipse-shaped light of Y-axis, therefore according to noted earlier, for reaching the bigger distance range that reads, essential earlier with a collector lens 2, with the light furnishing near parallel beam, the light source that reads that ellipse-shaped light is a subideal was mentioned in the front, and laser diode 1 itself is exactly oval projection light, but remove to design a non-spherical lens according to the ellipse-shaped light of laser diode 1, be a kind of difficulty height, the mode that manufacturing cost is high, in addition the spot size of this moment is excessive, still is not suitable for reading bar code.
The circle that process collector lens 2 presents is near parallel light beam, because of spot size too big, must add first anti-dazzling screen 6 with circular hole 61, allow the desired light that passes through pass through, form a thinner light beam, the hot spot that so is incident upon on the object (bar code) becomes desirable small light spot.
The anti-dazzling screen that uses square or slot is arranged in the existing product, this anti-dazzling screen design square or slot has two shortcomings, one for producing the grating effect because of light by slit, and two for the light that form through slit can be out of shape because of distance, and these phenomenons all can be through experiment confirm.
Yet the utility model applicant in having an application to utilize cylindrical mirror at present, produces the projection source of a desirable thin-and-long in order to solve this problem, and this thin-and-long projection source can be as light by as the slit, along with distance changes and the hot spot of distortion.But cylindrical mirror is still desirable not to the utmost on resolution after finishing, and also has any problem technically with the cylindrical mirror that glass is made.
The fundamental purpose of the utility model is to solve above-mentioned disappearance, avoids disappearance to exist, and a kind of projection source structure of barcode machine is provided, and its beam shape is fit to barcode machine, and its light beam is can not be out of shape along with distance.
The purpose of this utility model is achieved in that
A kind of scanning projection source structure of barcode machine, this projection source structure includes: a laser diode, one is positioned at the collector lens in aforementioned laser secondary body the place ahead, one is positioned at first anti-dazzling screen in aforementioned collector lens the place ahead, its characteristics are: first above-mentioned anti-dazzling screen the place ahead disposes second anti-dazzling screen, have a through hole on it, these through hole both sides are provided with relative light shielding part.
Described light shielding part is an arcwall face.
Described light shielding part is designed to cover four fixed positions, upper and lower, left and right of circular hole.
Each light shielding part covers the about 1/6-1/8 of area of the circular hole of first anti-dazzling screen.
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1, known scanning projection source organigram.
Fig. 2, another kind of known scanning projection source organigram.
Fig. 3, the scanning projection source organigram of the utility model.
Fig. 4, the synoptic diagram during the scanning projection source laser radiation of the utility model.
Fig. 3 is the utility model scanning projection source organigram.As shown in the figure: the scanning projection source structure of the utility model barcode machine, include: a laser diode 1, one is positioned at the collector lens 2 in aforementioned laser diode 1 the place ahead, one is positioned at first anti-dazzling screen 3 in aforementioned collector lens 2 the place aheads, and one second anti-dazzling screen 4 that is positioned at aforementioned first anti-dazzling screen 3 the place aheads constitute, allow institute's scanned (bar code) last hot spot that is projected to can not look like light by (producing halation or astigmatism) as the slit, along with distance changes and is out of shape as the luminous point periphery.
Above-mentioned laser diode 1 is one to be that 30 ° of X-axis, Y-axis project an oval-shaped beam for 10 ° with the projection source angle, is light source required when the barcode machine (not shown) is provided scanned scanning;
This collector lens 2 is positioned at above-mentioned laser diode 1 the place ahead, and the oval-shaped beam that laser diode 1 is projected is gathered into oval parallel beam;
This first anti-dazzling screen 3 is positioned at or is attached at above-mentioned collector lens 2 the place aheads, has a circular hole 31 on it, utilizes the above-mentioned collector lens 2 of these circular hole 31 restrictions to be gathered into the spot size of oval parallel beam, is a circular small light spot output;
This second anti-dazzling screen 4, be positioned at above-mentioned anti-dazzling screen 3 the place aheads, has a through hole 41 on it, these through hole 41 both sides are provided with curved relative light shielding part 42,42 ', this light shielding part 42,42 ' is on being seated in above-mentioned circular hole 31 time, the area of this each light shielding part 42, the 42 ' circular hole that covers 31 is about 1/6～1/8, first anti-dazzling screen, 3 formed circular small light spots can be shaped to one and have the light beam output that arc is cut edge, and constitutes a brand-new scanning projection source structure in this way.
Fig. 3, Fig. 4 are respectively the synoptic diagram of the utility model scanning projection source structure and laser radiation.As shown in the figure: at barcode machine to scanned when carrying out bar code scan, the oval-shaped beam that this laser diode 1 is projected, project a parallel beam through collector lens 2, circular hole 31 through first anti-dazzling screen 3 projects a circular penlight again, this circular penlight is by having two arcwall face light shielding parts 42, during 42 ' through hole 41, this light shielding part 42,42 ' covers the partly light beam of process circular hole 31, form one and have the light beam of arc side cut (according to the characteristic of light, when light beam the time by tangent plane, can't as cutter cut neat, in fact still have diffraction and interference), this arc is cut edge and is throwed near more distance just more near straight line, after projection distance zooms out, the arc-shaped projection that its arc is cut edge is more and more obviously (as shown in Figure 4), therefore at certain apart from Nei Keda very high-res, apart from after zooming out, then being applicable to the bar code than low-res, is to be a more satisfactory projecting beam that reads bar code therefore.
Further, the above-mentioned light shielding part of being carried 42,42 ' also can be designed to cover four positions, upper and lower, left and right of circular hole 31 except being designed to cover circular hole 31 both sides.
Claims (4)
1, a kind of scanning projection source of barcode machine structure, this projection source structure includes: a laser diode (1), one is positioned at the collector lens (2) in aforementioned laser secondary body (1) the place ahead, one is positioned at first anti-dazzling screen (3) in aforementioned collector lens (2) the place ahead, it is characterized in that: above-mentioned first anti-dazzling screen (3) the place ahead disposes one second anti-dazzling screen (4), have a through hole (41) on it, this through hole (41) both sides are provided with relative light shielding part (42,42 ').
2, the scanning projection source of barcode machine according to claim 1 structure is characterized in that the light shielding part (42,42 ') of second anti-dazzling screen (4) is an arcwall face.
3, the scanning projection source of barcode machine according to claim 2 structure is characterized in that the light shielding part (42,42 ') of second anti-dazzling screen (4) is designed to cover four fixed positions, upper and lower, left and right of the circular hole (31) of first anti-dazzling screen (3).
4,, it is characterized in that the about 1/6-1/8 of circular hole (31) area of each light shielding part (42,42 ') first anti-dazzling screen (3) that cover of second anti-dazzling screen (4) according to the scanning projection source structure of claim 1 or 2 or 3 described barcode machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01210083 CN2459672Y (en) | 2001-01-08 | 2001-01-08 | Scan projection light source structure for bar code machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01210083 CN2459672Y (en) | 2001-01-08 | 2001-01-08 | Scan projection light source structure for bar code machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2459672Y true CN2459672Y (en) | 2001-11-14 |
Family
ID=33629703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01210083 Expired - Lifetime CN2459672Y (en) | 2001-01-08 | 2001-01-08 | Scan projection light source structure for bar code machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2459672Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761775A (en) * | 2018-06-20 | 2018-11-06 | 广州市钛码电子科技有限公司 | A kind of double pendulum index glass laser scanning device |
-
2001
- 2001-01-08 CN CN 01210083 patent/CN2459672Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761775A (en) * | 2018-06-20 | 2018-11-06 | 广州市钛码电子科技有限公司 | A kind of double pendulum index glass laser scanning device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20110108 Granted publication date: 20011114 |