CN101320421A - Optical reading head - Google Patents
Optical reading head Download PDFInfo
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- CN101320421A CN101320421A CNA2008101344701A CN200810134470A CN101320421A CN 101320421 A CN101320421 A CN 101320421A CN A2008101344701 A CNA2008101344701 A CN A2008101344701A CN 200810134470 A CN200810134470 A CN 200810134470A CN 101320421 A CN101320421 A CN 101320421A
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- diffuseness
- light source
- read head
- optical read
- light
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Abstract
An optical pickup head is provided, which is utilized for picking up the image of an object. The optical pickup head comprises a shell body, a diffusion structure, an optical source module and a sensitization module. The diffusion structure is connected with the shell body. The optical source module is provided with a basal plate and a first optical source positioned on the facade of the basal plate. The facade of the basal plate is positioned on the external surface of the diffusion structure. The first optical source provides an initial light ray and casts the light ray into the diffusion structure. Then, the diffusion structure processes the initial light ray into an equalized light ray and transmits the processed light ray. The sensitization module is positioned inside the shell body to sense a reflected light ray which is produced when the equalized light ray is reflected by the object. Therefore, the invention can be applied to eliminate the identification dead corner resulted from strong reflected light ray, enhance the lighting efficiency, reduce the number of optical sources and consumption of electric power, improve the evenness of lighting and improve the allowed scope for inclined angle.
Description
Technical field
The present invention relates to a kind of optical read head.
Background technology
Fig. 1 is a kind of application synoptic diagram of traditional optical read head.As shown in Figure 1, optical read head 101 is used to read object 102, and wherein optical read head 101 comprises hollow housing 110, light source module 120 and illuminant module 140.Light source module 120 is fixed in the hollow housing 110 and light is provided.Light shines object 102 after hollow housing 110 internal reflections.Illuminant module 140 is fixed in the hollow housing 110, is used for the light that sensing is reflected by object 102.
The reflection of light can be divided into three kinds of forms, just direct reflection, scattered reflection and diffuse reflection.Direct reflection is meant that the incident angle of light equals reflection angle.The light that scattered reflection occurs in uneven surface and reflection surpasses an angle, and all catoptrical reflection angle more or less can be identical with incident angle.The reflection of diffuse reflection type occurs in coarse or rough surface, and its reflected light has many different angles.
Because the internal face of hollow housing 110 does not belong to minute surface, enters into illuminant module 140 so have veiling glare L10.Present employed illuminant module 140 includes the CMOS sensor, and its resolution is generally 100 * 100.(Field ofView, (the pattern diagonal angle/2/EFL) * 2, wherein EFL is the equivalent focal length of lens to the visible angle of the lens collocation CMOS sensor of illuminant module 140 FOV) to be about ArcTan.Light source module 120 is light emitting diode (LED) normally, and its emission wavelength is approximately the infrared ray of 800nm～950nm.The lens fixed sturcture of illuminant module 140 can be adjusted the capture distance of the image of lens to the object 102.The reflection characteristic of the lens fixed sturcture by adjusting illuminant module 140, the internal face of design hollow housing 110 and the position of adjusting light source module 120, promptly may command optical read head 101 is for the illuminating effect of object 102.
In an example, the picture of separating of camera lens is about 50 to 80lp/mm, refractive index Rl＞80%, and relatively clear aperture (f-number F/N) should not be too high in order to avoid increase the illumination burden.The angle of inclination of allowing that read head reads object will reach 30 to 40 degree, and the depth of field of camera lens (Deep of focus) is greater than ± 0.7mm.Object 102 can be an e-book, is printed on the two-dimensional bar code pattern above.Because the paper material of e-book is reflective easily, add that read head may reach 0 to 30 degree with the angle of inclination A of paper, or or even 0 to 40 degree when the user held read head and reads e-book.Therefore, must avoid the reflective high light that causes of paper to enter in the illuminant module 140 and cause can't the identification object problem.
In Fig. 1, allow such as be that the light that the light source module 120 of light emitting diode sends is beaten on the internal face of hollow housing 110 that for example is the taper nib, to increase the incident light intensity.But this case inventor finds to equal 24 when spending in incident angle, still have the reflection high light and enter into illuminant module 140, and the internal face (being commonly referred to reflex housing) with reflecting effect also can make veiling glare penetrate back illuminant module 140 and further reduce contrast.
Fig. 2 is the application synoptic diagram of the traditional optical read head of another kind.The optical read head of Fig. 2 is similar to Fig. 1, and difference is directly to beat on object 102 with the light as the LED 120 of light source module, and this situation is very easy to cause the high light of reflection to enter in the illuminant module 140 and further reduces contrast.
Therefore, the shortcoming of optical read head is to avoid to reflect identification dead angle that high light causes, can't effectively promotes illumination efficiency with the use amount and the power consumption that reduce LED and can't effectively improve the permissible range at angle of inclination in the prior art.In addition, the assembling of the optical read head of prior art is also quite complicated.
Summary of the invention
Therefore, purpose of the present invention is to provide a kind of optical read head, can eliminate the identification dead angle that strong reflection light is caused simultaneously, promotes the quantity and the power consumption of illumination efficiency with the minimizing light source, and the homogeneity of lifting illumination is to improve the angle of inclination permissible range.
For reaching above-mentioned purpose, the invention provides a kind of optical read head, be used to read the image of object.Optical read head comprises housing, diffuseness structure, light source module and illuminant module.Diffuseness structure is connected to housing.Light source module has substrate and is mounted to first light source of substrate front side.The front of substrate is fixed to the outside surface of diffuseness structure.First light source provides initial light to inject in the diffuseness structure.Diffuseness structure is exported after initial light is processed into uniform light.Illuminant module is fixed in the housing, is used for the reflection ray that the sensing uniform light is produced by the object reflection.
As the further preferred version of the present invention, the optical axis of described illuminant module is parallel to the axial direction of described diffuseness structure.
As the further preferred version of the present invention, described substrate is a flexible circuit board, and described first light source is electrically connected to described flexible circuit board.
As the further preferred version of the present invention, described light source module further comprises secondary light source, and described secondary light source is installed on the described flexible circuit board, and is electrically connected to described flexible circuit board.
As the further preferred version of the present invention, described first light source and/or described secondary light source directly are welded on the flexible circuit board.
As the further preferred version of the present invention, described substrate surpasses 360 degree around described diffuseness structure.
As the further preferred version of the present invention, described first light source is contained in the groove of described diffuseness structure, makes light vertical incidence that described first light source sends to described diffuseness structure.
As the further preferred version of the present invention, described diffuseness structure is hollow tube or solid cylinder.
As the further preferred version of the present invention, described diffuseness structure can move with respect to described housing.
As the further preferred version of the present invention, the front of described substrate is fixed to the outside surface of described diffuseness structure by viscose glue.
As the further preferred version of the present invention, the accidental light line reflection that first light source that the front of described substrate is used for directly not being incident upon described diffuseness structure is sent is in described diffuseness structure.
As the further preferred version of the present invention, described diffuseness structure further comprises parasitic light and eliminates section, is used to avoid parasitic light to enter described illuminant module.
As the further preferred version of the present invention, the equivalent focal length of described lens is less than or equal to 3 millimeters.
Therefore, adopt structure of the present invention, can significantly dwindle optical read head volume, portably use to make things convenient for the user.In addition, because the light that has adopted diffuser structure to make light source send can be realized homogenising in less space, make light source can install very near tested object, homogeneity by promoting illumination to be eliminating the identification dead angle that strong reflection light is caused simultaneously, thereby promotes quantity and the power consumption that illumination efficiency reduces light source; And light has been eliminated directivity through diffusion, makes reading device angle of inclination permissible range become big.And therefore most of light that light source sent can further effectively promote illumination efficiency and identification capability near vertically being incident in the diffuseness structure.Adopt structure of the present invention, it is also quite convenient to assemble.
In further technical scheme of the present invention, because light emitting diode directly is welded on the flexible circuit board, form so-called surface-mounted light emitting diode (Surface Mount LED), make the fixed form of light source module simplify more, and do not need complicated fixed form, as long as around diffuseness structure one circle, therefore, it is easier that the assembling of optical read head can become with flexible circuit board.
In further technical scheme of the present invention, the present invention also can add the parasitic light elimination section that is used to eliminate parasitic light, even shorten the length of diffuseness structure, also can reach the effect of eliminating parasitic light.The diffuseness structure of optical read head is shortened, make object distance can become shorter, need to strengthen visible angle (the Field of View of CMOS sensor this moment, FOV) just can sense onesize object, so can select the less lens of equivalent focal length for use, and obtain short image distance, therefore, the entire length of optical read head is effectively shortened.
For the present invention's foregoing can be become apparent, lift preferred embodiment below, and conjunction with figs., be described in detail below.
Description of drawings
Fig. 1 is a kind of application synoptic diagram of traditional optical read head.
Fig. 2 is the application synoptic diagram of the traditional optical read head of another kind.
Fig. 3 is the application synoptic diagram of optical read head in the first embodiment of the invention.
Fig. 4 is the application synoptic diagram of optical read head in the second embodiment of the invention.
The main element symbol description:
L1: initial light
L2: uniform light
L3: reflection ray
L4: less important light
1: optical read head
2: object
10: housing
11: the outer wall of housing
20: diffuseness structure
20A: the axial direction of diffuseness structure
21: the outside surface of diffuseness structure
22: parasitic light is eliminated section
23: the inwall of diffuseness structure
24,25: the groove of diffuseness structure
30: light source module
31: substrate
31A: the front of substrate
32: the first light sources
33: secondary light source
35: viscose glue
40: illuminant module
40A: the optical axis of illuminant module
41: lens
42: image sensor
43: infrared filter
44: lens barrel
50: motherboard
60: lead
Embodiment
Fig. 3 is the application synoptic diagram of optical read head in the first embodiment of the invention.As shown in Figure 3, the optical read head 1 of present embodiment is used to read the image of object 2.Object 2 is an e-book for example, is printed on for example pattern of two-dimensional bar code above.Optical read head 1 comprises housing 10, diffuseness structure 20, light source module 30 and illuminant module 40.
For brighter uniform light is provided, light source module 30 can further have secondary light source 33, and secondary light source 33 is installed on the substrate 31, and is electrically connected to substrate 31.Secondary light source 33 also can be a light emitting diode.In the groove 24 that first light source 32 and secondary light source 33 can be contained in diffuseness structure 20 and the groove 25, make its most light can vertical incidence to diffuseness structure 20.In the present embodiment, first light source 32 and secondary light source 33 all are installed on the same substrate 31, and in another example, secondary light source 33 can be installed on another substrate.And light source module 30 is including but not limited to a light emitting diode or a plurality of light emitting diode.A plurality of light emitting diodes can send identical light or different light.
For the infrared light light in addition that filtering first light source and the secondary light source sent, illuminant module 40 can further comprise infrared filter 43, and it is fixed in the housing 10, is used for the infrared light by reflection ray L3.For example, this infrared filter 43 can be selected the infrared light bandpass filter that can see through infrared light for use.
For the ease of the adjustment of focusing, diffuseness structure 20 can be designed so that its inwall 23 can slide with respect to the outer wall 11 of housing 10 or move.Perhaps, inwall 23 and outer wall 11 can have corresponding screw thread so that the adjustment of focusing.
In the present embodiment, the positive 31A of substrate 31 can be fixed to the outside surface 21 of diffuseness structure 20 by viscose glue 35, and assembling easily.In addition, the less important light L4 that sent of the positive 31A of substrate 31 first light source 32 that is used for directly not being incident upon diffuseness structure 20 reflexes in the diffuseness structure 20.
Fig. 4 is the application synoptic diagram of the optical read head of second embodiment of the invention.For the purpose of clear the demonstration, Fig. 4 does not demonstrate substrate and viscose glue.As shown in Figure 4, present embodiment is similar to first embodiment, and difference is that diffuseness structure 20 has parasitic light and eliminates section 22, is used to avoid parasitic light to enter illuminant module 40.Parasitic light elimination section 22 is designed to coniform usually, is used for avoiding parasitic light to enter into illuminant module 40.
In addition, in the present embodiment, illuminant module 40 comprises lens barrel 44, lens 41 and image sensor 42.Similarly, illuminant module 40 can further comprise infrared filter 43.Lens barrel 44 is fixed in the housing 10.Lens 41 are fixed in the lens barrel 44.Image sensor 42 is fixed in housing 10, and sees through lens 41 reception reflection ray L3.Infrared filter 43 can be fixed on parasitic light and eliminate between section 22 and the lens 41, and the reflection ray L3 that is used to offset except that parasitic light carries out filtering, and filtered reflection ray L3 is penetrated in the lens 41.As shown in Figure 4, infrared filter 43 can be fixed in the diffuseness structure 20.
Comparison diagram 3 and Fig. 4 are as can be known, structure shown in Fig. 3 adopts sufficiently long diffuser structure to eliminate parasitic light, and present embodiment has added the parasitic light elimination section 22 that is used to eliminate parasitic light, even therefore shorten the length of diffuseness structure 20, also can reach the effect of eliminating parasitic light.As seen, in the present embodiment, the length of learning read head 1 can effectively be shortened.
(Equivalent Focal Length is more than or equal to 5 millimeters EFL) to the equivalent focal length of the lens of traditional optical read head.Eliminate section 22 owing to adopted parasitic light, the diffuseness structure of optical read head is shortened, make object distance can become shorter, need to strengthen visible angle (the Field of View of CMOS sensor this moment, FOV) just can sense onesize object, thus the less lens of equivalent focal length can be selected for use, and obtain short image distance, therefore, the entire length of optical read head is effectively shortened.(Equivalent FocalLength EFL) can be less than or equal to 3 millimeters to the equivalent focal length of the lens 41 of the optical read head of present embodiment.
In sum, adopt the above embodiment of the present invention, can significantly dwindle optical read head volume, portably use to make things convenient for the user.In addition, because light source can be installed very near tested object, and therefore most of light that light source sent can effectively promote illumination efficiency and identification capability near vertically being incident in the diffuseness structure.In addition, light emitting diode can directly be welded on the flexible circuit board, form so-called surface-mounted light emitting diode (Surface Mount LED), make the fixed form of light source module simplify more, and do not need complicated fixed form, as long as flexible circuit board is enclosed around diffuseness structure one.Therefore, the assembling of optical read head can become quite easy.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1, a kind of optical read head (1) is used to read the image of object (2), it is characterized in that, this optical read head (1) comprises:
Housing (10);
Diffuseness structure (20) is connected to described housing (10);
Light source module (30), have substrate (31) and be mounted to first light source (32) in the front (31A) of described substrate (31), the front (31A) of described substrate (31) is fixed to the outside surface (21) of described diffuseness structure (20), described first light source (32) provides initial light (L1) to be incident upon in the described diffuseness structure (20), and described diffuseness structure (20) is processed into the output of uniform light (L2) back with described initial light (L1); And
Illuminant module (40) is fixed in the described housing (10), is used for the reflection ray (L3) that the described uniform light of sensing (L2) is produced by described object (2) reflection.
2, optical read head as claimed in claim 1 (1) is characterized in that, the optical axis (40A) of described illuminant module (40) is parallel to the axial direction (20A) of described diffuseness structure (20).
3, optical read head as claimed in claim 1 (1) is characterized in that, described substrate (31) is a flexible circuit board, and described first light source (32) is electrically connected to described flexible circuit board.
4, optical read head as claimed in claim 3 (1) is characterized in that, described light source module (30) further comprises secondary light source (33), and described secondary light source (33) is installed on the described flexible circuit board, and is electrically connected to described flexible circuit board.
5, optical read head as claimed in claim 4 (1) is characterized in that, described first light source (32) and/or described secondary light source (33) directly are welded on the flexible circuit board.
As claim 1 or 4 described optical read heads (1), it is characterized in that 6, described substrate (31) surpasses 360 degree around described diffuseness structure (20).
7, optical read head as claimed in claim 1 (1) is characterized in that, described first light source (32) is contained in the groove of described diffuseness structure (20), makes light vertical incidence that described first light source (32) sends to described diffuseness structure (20).
8, optical read head as claimed in claim 1 (1) is characterized in that, described diffuseness structure (20) is hollow tube or solid cylinder.
9, optical read head as claimed in claim 1 (1) is characterized in that, described diffuseness structure (20) can move with respect to described housing (10).
10, optical read head as claimed in claim 1 (1) is characterized in that, the front (31A) of described substrate (31) is fixed to the outside surface (21) of described diffuseness structure (20) by viscose glue (35).
11, optical read head as claimed in claim 1 (1), it is characterized in that the less important light (L4) that first light source (32) that the front (31A) of described substrate (31) is used for directly not being incident upon described diffuseness structure (20) is sent reflexes in the described diffuseness structure (20).
12, optical read head as claimed in claim 1 (1) is characterized in that, described diffuseness structure (20) further comprises parasitic light and eliminates section (22), is used to avoid parasitic light to enter described illuminant module (40).
13, optical read head as claimed in claim 12 (1) is characterized in that, the equivalent focal length of described lens (41) is less than or equal to 3 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101344701A CN100559385C (en) | 2008-07-23 | 2008-07-23 | A kind of optical read head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008101344701A CN100559385C (en) | 2008-07-23 | 2008-07-23 | A kind of optical read head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101320421A true CN101320421A (en) | 2008-12-10 |
| CN100559385C CN100559385C (en) | 2009-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2008101344701A Expired - Fee Related CN100559385C (en) | 2008-07-23 | 2008-07-23 | A kind of optical read head |
Country Status (1)
| Country | Link |
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| CN (1) | CN100559385C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621775A (en) * | 2012-03-29 | 2012-08-01 | 李卫伟 | Imaging and lighting device and optical identifying equipment |
| CN103186759A (en) * | 2013-04-17 | 2013-07-03 | 苏州斯普锐智能系统有限公司 | Barcode scanner with dynamic multi-angle illuminating system |
| CN103268466A (en) * | 2013-05-21 | 2013-08-28 | 苏州斯普锐智能系统有限公司 | Multi-angle lighting bar code scanner |
| CN106324819A (en) * | 2015-07-09 | 2017-01-11 | 承奕科技股份有限公司 | Anti-glare uniform-light light source and image capture device with same |
| CN109815768A (en) * | 2019-01-31 | 2019-05-28 | 福州符号信息科技有限公司 | A kind of bar code recognizing apparatus |
-
2008
- 2008-07-23 CN CNB2008101344701A patent/CN100559385C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621775A (en) * | 2012-03-29 | 2012-08-01 | 李卫伟 | Imaging and lighting device and optical identifying equipment |
| CN102621775B (en) * | 2012-03-29 | 2014-04-16 | 北京慧眼智行科技有限公司 | Imaging and lighting device and optical identifying equipment |
| CN103186759A (en) * | 2013-04-17 | 2013-07-03 | 苏州斯普锐智能系统有限公司 | Barcode scanner with dynamic multi-angle illuminating system |
| CN103186759B (en) * | 2013-04-17 | 2015-07-08 | 苏州斯普锐智能系统有限公司 | Barcode scanner with dynamic multi-angle illuminating system |
| CN103268466A (en) * | 2013-05-21 | 2013-08-28 | 苏州斯普锐智能系统有限公司 | Multi-angle lighting bar code scanner |
| CN103268466B (en) * | 2013-05-21 | 2016-03-02 | 苏州斯普锐智能系统有限公司 | A kind of barcode scanner of multi-angle illumination |
| CN106324819A (en) * | 2015-07-09 | 2017-01-11 | 承奕科技股份有限公司 | Anti-glare uniform-light light source and image capture device with same |
| WO2017005153A1 (en) * | 2015-07-09 | 2017-01-12 | 承奕科技股份有限公司 | Anti-glare light-equalizing light source and image capturing device having same |
| CN106324819B (en) * | 2015-07-09 | 2019-02-01 | 承奕科技股份有限公司 | The even radiant of anti-glare and the image capture unit for having the light source |
| CN109815768A (en) * | 2019-01-31 | 2019-05-28 | 福州符号信息科技有限公司 | A kind of bar code recognizing apparatus |
| CN109815768B (en) * | 2019-01-31 | 2023-02-21 | 福州符号信息科技有限公司 | Bar code reading equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100559385C (en) | 2009-11-11 |
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Granted publication date: 20091111 Termination date: 20170723 |