CN2321022Y - Automatic focusing device - Google Patents
Automatic focusing device Download PDFInfo
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- CN2321022Y CN2321022Y CN 97216604 CN97216604U CN2321022Y CN 2321022 Y CN2321022 Y CN 2321022Y CN 97216604 CN97216604 CN 97216604 CN 97216604 U CN97216604 U CN 97216604U CN 2321022 Y CN2321022 Y CN 2321022Y
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Abstract
The utility model relates to a natural focusing device, which is arranged on an optical scanner and comprises a lens positioning and adjusting unit capable of adjusting the position of a lens, a CCD positioning and adjusting unit capable of adjusting the position of a Charge Coupled Device and a control unit capable of controlling the actions of the lens positioning and adjusting unit and the CCD positioning and adjusting unit, when the scanner is started up, the optical path and the focal length required by the imaging of the lens can be automatically adjusted, the lens and the CCD are moved to proper positions, so that the lens can accurately focus and image a target on the CCD, and the resolution of the optical scanner can be greatly improved.
Description
The utility model relates to a kind of automatic focusing mechanism that is used for optical scanning device, the lens unit, that " light " can be gathered into picture by a lamp source that " light " can be provided, a reflector element, that " light " reflection can be folded to " light " signal transformation can be become digital signal charge coupled cell (CCD) but and the computer of a processing digital signal form.
Office automation (OA, Office automation) luxuriant in the society of present data informationization is one trend, except the processing and storage that are used as great mass of data with computer, be used as the input media of data such as file, form and image by optical scanning device (scanner), because of can effectively improving the efficient of data input and processing, so also used in a large number at large, the standard that becomes computer one of is equipped with.
Existing optical scanner is when the former contribution B of scanning different specification size (as depicted in figs. 1 and 2), reach by switching the C of camera lens mechanism more than a group, camera lens D, the E that switches to different multiplying when different size be with correspondence, can make that focal length is correct and make image be projeced into just on the charge coupled cell A.Though these camera lenses D, E adopt total optical path identical and be arranged at the C of many camera lenses mechanism in the mode of a relevant cooperation position, make it can correctly image on the charge coupled cell A, yet, because this camera lens is a complex optics, it can produce the error of a little unavoidably in the process of grinding, processing, make required total optical path of each camera lens blur-free imaging and focusing length or a little difference slightly, so in the process that camera lens switches, situation shown in the dotted portion among Fig. 2 will take place, its image just can't accurately image on electric charge coupling element A.And even optical scanner only has a tool camera lens, also the error of often processing or installing because of camera lens has influence on the degree of accuracy of lens focus imaging.
For the unclear problem of imaging that this kind causes because of the error of camera lens on process or installation site, the general low traditional optical scanning machine (pure Optical Resolution is the following person of 300 * 600dpi) of separating the folding degree is all taked the mode of tolerable error; Yet for the high-order optical scanning device of high-res (pure Optical Resolution is more than 600 * 1200dpi), so the error on total optical path and the focal length (the 50 μ m even its error is only had an appointment) will have a strong impact on its scanning quality.To this, traditional practice is to utilize manual mode, is adjusted the relevant position of camera lens and charge coupled cell by optical scanning device inside; Yet, this kind practice because of needs with scanning machine whole disassemble to come just can carry out, very inconvenient, and remain to be improved.
The purpose of this utility model is to provide a kind of automatic focusing mechanism in order to overcome defective of the prior art, be arranged on the optical scanning device, can when using optical scanning device, do automatic adjustment in response to lens imaging required light path and focal length length automatically, camera lens and charge coupled cell are displaced into the appropriate location, make camera lens that target is accurately focused, imaged on the charge coupled cell.
The purpose of this utility model realizes by following technical measures: it includes camera lens location adjustment unit, can adjust the displacement of camera lens on " light " axle in right amount; One CCD locatees adjustment unit, can adjust the displacement of charge coupled cell (CCD) on " light " axle in right amount; And a control module can receive the digital signal that is transmitted by CCD and use the action that this camera lens of control is located adjustment unit and CCD location adjustment unit; When scanning machine when start is used, by scanning one with reference to object, control module can calculate imaging required best total optical path and focal length, and controls lens location adjustment unit and CCD location adjustment unit, respectively lens unit and CCD adjustment are positioned the appropriate location, make its total journey and focusing meet optimized requirement, to obtain best scanning effect.
Description of drawings:
When Fig. 1, Fig. 2 coexist cutaway for existing multi-lens optical scanning, the synoptic diagram of its " light " image formation state
Fig. 3 is arranged at a preferred embodiment figure on the multi-lens optical scanning machine for the utility model
Figure number explanation among the figure:
1 be optical scanning device, 2 for following lamp source, 3 for last lamp source, 4 for the original copy bearing glass,
5 for reflector element, 6 for lens unit, 7 for charge coupled cell (CCD), 8 be first camera lens,
9 be second camera lens, 20 for the camera lens switch unit, 21 for lens bracket, 22 for the camera lens slide-bar,
30 for camera lens location adjustment unit, 31 be first motor, 32 be first gear unit,
33 be first lead screw, 34 for bearing, 36 be the 3rd slide-bar, 40 for CCD locate adjustment unit,
41 be second motor, 42 be second gear unit, 43 be second lead screw, 44 for pedestal,
50 is that computer, 60 is with reference to object.
See also Fig. 3, be arranged at the preferred embodiment figure of a multi-lens optical scanning machine for automatic focusing mechanism of the present utility model.Optical scanning device 1 is the optical scanning device of camera lens more than, and it mainly includes one in order to last lamp source 3 that " light " is provided and lamp source 2 down; One desires the original copy bearing glass 4 of the former contribution (not shown) scanned in order to bearing; " light " that is penetrated by lamp source 2,3 after the reflection (or transmission) of former contribution (not shown),, is folded to and is incident upon a lens unit 6 so that the light path of " light " meets the required length of blur-free imaging by the several reflection of a reflector element 5; " light " is imaged on via the gathering of lens unit 6 on the charge coupled cell (Charge Coupled Device is called for short CCD) 7, and is transformed into the digital signal that the brain 50 of can powering is handled.And, lens unit 6 includes two first camera lens 8 and second camera lenses 9 that multiplying power is inequality, by the action of a camera lens switch unit 20, can drive the change action of 8,9 on these two camera lenses, can adapt to the former contribution that scans different size and the requirement of different resolutions.
Camera lens switch unit 20 includes a lens bracket 21, it has camera lens 8,9 in order to bearing, the both sides of lens bracket 21 are erected at respectively on the camera lens slide-bar 22, and the direction of camera lens slide-bar 22 can be switched lens bracket 21 along the direction of camera lens slide-bar 22 and is moved along the direction setting perpendicular to " light " axle.Two camera lenses 8,9 stagger and are arranged on the lens bracket 21, and focusing " light " axle that makes each camera lens 8,9 is not on same straight line; When the direction of lens bracket 21 vertical " light " axle in camera lens slide-bar 22 upper edges moves, can related moving lens 8,9 and make and only have a tool camera lens just can be positioned at the work that " light " is engaged in focusing on axially in the same time, to reach the purpose that camera lens switches.
Of the present utility model being characterised in that:
Set up at lens unit 6 places and to put camera lens location adjustment unit 30, can be used for adjusting the displacement of lens unit 6 on " light " axle; Set up at charge coupled cell (CCD) 7 places and to put CCD location adjustment unit 40, can be used for adjusting the displacement of charge coupled cell 7 on " light " axle; On original copy bearing glass 4, have additional one with reference to object 60 (it can be a focusing correction plate); And, other set up put one can be in order to controlling the control module of this camera lens location adjustment unit 30 and adjustment unit 40 actions of CCD location, and this control module is different from original drive controlling element in the former scanning machine 1.Control module is by scan reference object 60 resulting numerical informations, can be analyzed and required best total optical path value and focal length value when calculating scan manuscript spare by computer 50, and use controls lens and locate adjustment unit 30 and adjustment unit 40 actions of CCD location, respectively lens unit 6 and charge coupled cell 7 are adjusted to optimal position, make the total optical path and the focusing of its imaging meet optimized requirement, to obtain the scanning effect of the most perfect and high-res.
This camera lens location adjustment unit 30 includes: one first motor 31, one first gear unit 32, one first lead screw 33, a bearing 34, one first slide-bar 35, and one the 3rd slide-bar 36.Bearing has the camera lens switch unit 20 and the lens unit 6 of whole group on bearing 34; The both sides of bearing 34 are respectively arranged with first slide-bar 35 and the 3rd slide-bar 36, and first and third slide-bar 35,36 can slide bearing 34 along " light " direction of principal axis along the setting of " light " axle.One side of bearing 34 and bridging is engaged on first lead screw 33, and first lead screw 33 also is to be provided with along " light " axle.End at first lead screw 33 is combined with first gear unit 32, and is attached on first motor 31 by first gear unit 32.By the driving of first motor 31, but 33 rotations of transmission first lead screw, and drive bearing 34 moves along " light " direction of principal axis together with lens unit 6 and camera lens switch unit 20.
CCD location adjustment unit 40 includes: one second motor 41, one second gear unit 42, one second lead screw 43, an and pedestal 44.Bearing has charge coupled cell (CCD) 7 on pedestal 44, and the both sides of pedestal 44 mount respectively on first slide-bar 35 and the 3rd slide-bar 36, and pedestal 44 can be slided along the direction of slide-bar 35,36.Pedestal 44 and bridging is engaged on second lead screw 43, and second lead screw 43 is provided with along " light " axle; Be incorporated into second gear unit 42 at second lead screw, 43 1 ends, and be attached on second motor 41 by second gear unit 42.By the driving of second motor 41, but 43 rotations of transmission second lead screw, and it is mobile along " light " axle together with charge coupled cell (CCD) 7 to drive pedestal 44.
Now the utility model motion flow is further described: the utility model in use, when the user has just opened scanning machine 1 so that when carrying out scanning motion or using camera lens switch unit 20 just a certain camera lens to be switched on " light " axle with the action that scans, focus on, at first, focusing correction plate 60 will just be positioned at position to be scanned, make scanning machine 1 scan reference object 60 (focusing correction plate) in advance, scan resulting information material and then be admitted to interpretation in the computer 50.If the result that computer 50 is analyzed this information material assert that when the sharpness (resolution) of its imaging meets required standard, then computer 50 will send the formal scanning motion that a signalisation scanning machine 1 carries out former contribution.If the image data of scan reference object 60 gained back by analysis judges when its sharpness is not enough that then computer 50 will drive slightly moving lens unit 6 of camera lens location adjustment unit 30; Then, scan reference object 60 (focusing correction plate) obtains second image data again; Computer 50 is analyzed according to the image information data of this twice scanning gained then, and required best total optical path and focal length is long when calculating blur-free imaging; By this, control module just can drive camera lens location adjustment unit 30 and CCD location adjustment unit 40, and with after lens unit 6 and charge coupled cell (CCD) 7 adjustment, being positioned the appropriate location, send the formal scanning motion that a signalisation scanning machine 1 carries out former contribution again, to obtain best scanning effect.
Certainly, the above only is preferred embodiment of the present utility model, and it should not limit to practical range.Though the multi-lens optical scanning machine 1 shown in Fig. 3 is the optical scanning device of an original copy face movable type, yet or be the optical scanning device of an optical path device movable type (the original copy face is fixed).And for example, though the lens unit 6 shown in Fig. 3 contains two camera lenses 8,9, so lens unit 6 of the present utility model can be changed into and only have a camera lens (it can be zoom lens) or have plural camera lens.In addition, the multi-lens optical scanning machine 1 shown in Fig. 3 has two lamp sources 2,3, and so it also can only have a lamp source.
In sum, learn that the utility model is by scanning one with reference to object, and after calculating optimum pathway and focal length value by control module, drive the position that camera lens location adjustment unit and CCD location adjustment unit remove moving lens and CCD again, make the imaging effect optimization, can effectively improve existing optical scanning device, the error that is produced in processing and when installing because of camera lens, and problem such as the imaging that causes is unintelligible and resolution is not high.
Claims (6)
1. automatic focusing mechanism, include a lamp source that " light " can be provided, a lens unit, that the reflector element, that should " light " reflection be folded to can be gathered into " light " picture " light " signal transformation can be become digital signal charge coupled cell (CCD) but and the computer of a processing digital signal, it is characterized in that described automatic focusing mechanism also includes:
One can adjust the camera lens location adjustment unit of lens unit displacement in right amount, and described location adjustment unit includes: a motor, a lead screw, it is provided with along " light " axle, one gear unit connects described motor and lead screw, the power of motor can be conveyed to lead screw and make its rotation, an and bearing, described lens unit in bearing, and the one side bridges and is engaged on the lead screw, rotates by the motor driven lead screw, and driven and move along " light " direction of principal axis together with lens unit
One can adjust the CCD location adjustment unit of this charge coupled cell displacement in right amount, described CCD location adjustment unit includes: a motor, one lead screw, it is provided with along " light " axle, one gear unit, connect described motor and lead screw, the power of motor can be conveyed to lead screw and make its rotation, an and pedestal, described charge coupled cell (CCD) in bearing, and it bridges and is engaged on the lead screw, is driven by the rotation of motor driven lead screw, and move along " light " direction of principal axis together with charge coupled cell, and
One can receive the digital signal that is transmitted by charge coupled cell and use the control module that this camera lens of control is located adjustment unit and the adjustment unit action of CCD location, described control module includes: one with reference to object, this is a focusing correction plate with reference to object, bearing is in the original copy bearing glass, and one can be calculated to be required best total optical path and the focal length of picture, and the computer of controls lens location adjustment unit and CCD location adjustment unit.
2. automatic focusing mechanism according to claim 1, the both sides, bearing below that it is characterized in that described camera lens location adjustment unit respectively are provided with one along " light " axle can promote the slide-bar of the stability of bearing when moving.
3. automatic focusing mechanism according to claim 1 and 2, it is characterized in that described lens unit includes a plurality of camera lenses, and be provided with a camera lens switch unit, this camera lens switch unit includes camera lens slide-bar and lens bracket, device has this a plurality of camera lenses on lens bracket, and a plurality of camera lenses be branch be arranged and make each camera lens " light " axle on different straight lines, lens bracket is to be placed on the camera lens slide-bar, and the direction of camera lens slide-bar is perpendicular to " light " axle, lens bracket can be moved along the direction of camera lens slide-bar, and do the action of cutaway.
4. automatic focusing mechanism according to claim 1 and 2 is characterized in that the number of shots on the described lens unit is one.
5. automatic focusing mechanism according to claim 1 and 2 is characterized in that the number of shots on the described lens unit is two.
6. automatic focusing mechanism according to claim 1 and 2 is characterized in that the number of shots on the described lens unit is more than two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97216604 CN2321022Y (en) | 1997-05-27 | 1997-05-27 | Automatic focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97216604 CN2321022Y (en) | 1997-05-27 | 1997-05-27 | Automatic focusing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2321022Y true CN2321022Y (en) | 1999-05-26 |
Family
ID=33933462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97216604 Expired - Fee Related CN2321022Y (en) | 1997-05-27 | 1997-05-27 | Automatic focusing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2321022Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304901C (en) * | 2001-10-31 | 2007-03-14 | 金宝电子工业股份有限公司 | Camera autofocus method |
| CN100357779C (en) * | 2004-12-17 | 2007-12-26 | 鸿富锦精密工业（深圳）有限公司 | Automatic image focusing system and method |
| CN100438557C (en) * | 2003-03-11 | 2008-11-26 | 宇东科技股份有限公司 | light source fixed scanner and image compensation correction method thereof |
| CN100516962C (en) * | 2005-09-23 | 2009-07-22 | 鸿富锦精密工业（深圳）有限公司 | Multi-sectional focusing lens model group |
| US7590279B2 (en) | 2004-12-24 | 2009-09-15 | Saki Corporation | Appearance inspection apparatus for inspecting inspection piece |
| CN100549798C (en) * | 2004-02-20 | 2009-10-14 | 佳能株式会社 | Lens control device and camera |
-
1997
- 1997-05-27 CN CN 97216604 patent/CN2321022Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304901C (en) * | 2001-10-31 | 2007-03-14 | 金宝电子工业股份有限公司 | Camera autofocus method |
| CN100438557C (en) * | 2003-03-11 | 2008-11-26 | 宇东科技股份有限公司 | light source fixed scanner and image compensation correction method thereof |
| CN100549798C (en) * | 2004-02-20 | 2009-10-14 | 佳能株式会社 | Lens control device and camera |
| CN100357779C (en) * | 2004-12-17 | 2007-12-26 | 鸿富锦精密工业（深圳）有限公司 | Automatic image focusing system and method |
| US7590279B2 (en) | 2004-12-24 | 2009-09-15 | Saki Corporation | Appearance inspection apparatus for inspecting inspection piece |
| CN100516962C (en) * | 2005-09-23 | 2009-07-22 | 鸿富锦精密工业（深圳）有限公司 | Multi-sectional focusing lens model group |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |