CN101242471B - Optical module and its alignment and assembly method - Google Patents
Optical module and its alignment and assembly method Download PDFInfo
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- CN101242471B CN101242471B CN2007100080311A CN200710008031A CN101242471B CN 101242471 B CN101242471 B CN 101242471B CN 2007100080311 A CN2007100080311 A CN 2007100080311A CN 200710008031 A CN200710008031 A CN 200710008031A CN 101242471 B CN101242471 B CN 101242471B
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- lens unit
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Abstract
The present invention provides an optical module and its aiming, assembling method, the optical module includes a case unit, a sensitive unit fixed in the case unit, and a lens unit which the focusing source is on the sensitive unit. The case unit has an opening formed on one side. The lens unit is placed on the case and displayed in the opening relative to the sensitive unit frame. In addition, when assembling, the lens unit is inserted in the case unit by the opening, when aiming, only retrieving the center position of the lens coinciding to the center position of the sensitization unit to the object position after deducting the repairing optical length, can complete optical alignment, and greatly echance accuracy and conveniences when assembled.
Description
Technical field
The present invention relates to a kind of optical module, but be meant a kind of optical module of sensing image and aligning thereof, assemble method especially.
Background technology
Consulting Fig. 1, is example with the optical module 1 of general optical profile type image-input device such as scanner, mainly comprises shell block unit 11, photosensitive unit 12, lens unit 13 and luminescence unit 14.This shell block unit 11 has an involutory shell 111 and pedestal 112 mutually, and is formed on the groove 113 of this shell 111.This photosensitive unit 12 has along a plurality of photo-sensitive cells 121 of linear array on this pedestal 112, and this photo-sensitive cell 121 is a kind of CMOS (Complementary Metal Oxide Semiconductor) image sensing scanners (ImageSensor Scanner).This lens unit 13 is that this photosensitive unit 12 is embedded in the groove 113 of this shell 111 relatively.This luminescence unit 14 is that relative glass platform 2 is arranged on this shell 111, and has a plurality of light-emitting diodes 141.
When the object transmitting illuminant on aforementioned light-emitting diode 141 relative these glass platform 2, light source can by the refraction of this object position and along this Z-direction see through this lens unit 13 and focal imaging in aforementioned photo-sensitive cell 121, at this moment, aforementioned photo-sensitive cell 121 can sense light signal, and captures the locational image of this object.
Because the accuracy of aforementioned photo-sensitive cell 121 focal positions is primary keys of the aforementioned optical profile type input unit resolution of decision, therefore, this photosensitive unit 12 is had relatively high expectations with these lens unit 13 needed alignment precisions, and mainly be that this shell 111, this pedestal 112 are combined into one in advance with this photosensitive unit 12 at present, then, theoretical value according to estimation, this lens unit 13 is installed in the groove 113 that is formed with desired depth, to set the relative position of this lens unit 13 and this photosensitive unit 12.At last, this lens unit 13 is fixed in this pedestal 112, promptly finishes and aim at and assembling with sealing.
But according to cost consideration, the lens unit 13 of this optical module 1 is many at present to be assembled manually directly to be positioned in this groove 113, the error of ignoring these lens unit 13 optical axis length own, approximately+/-400 microns, and the relative position that this lens unit 13 and this photosensitive unit are 12, mainly the degree of depth and the lens axis length by this groove 113 decides, therefore, excessive error usually has the not good situations of alignment precision such as excessive focusing or focusing deficiency, causes the resolution of this optical module 1 to promote.
Summary of the invention
The object of the present invention is to provide and a kind ofly can promote alignment precision and effectively improve the optical module of optical resolution and aligning, assemble method.
The invention is characterized in that this optical module comprises: photosensitive unit has at least one photo-sensitive cell of sensing light source; The shell block unit, two keepers of two ends have a shell that this photosensitive unit is set, mount a pedestal being fastened on this shell, running through this shell and this pedestal and a slice cover plate, this shell has an opening that is formed on a side and extends along its length, this pedestal has mutually involutory and defines first pair of component and second pair of component of slot, this second pair of component is that the first pair of component of this opening and this by this shell engages this opening of this cover closure; And lens unit, be plugged in this slot, and this photosensitive unit is interposed on this pedestal relatively, and be emerging in this opening, and have a plurality of lens pillars, but aforementioned lens pillar has graded index and focused ray, thereby refracts to the light path of this photosensitive unit after making light source be equivalent to focus on by the light path of an object position incident; Whereby, see through this opening and along optical axis direction this photo-sensitive cell to object position is deducted the center of revising behind the light path again and divide first center line is arranged, make this first central lines in second center line by this lens unit center.
The alignment methods of optical module of the present invention, comprise the following step: step 1: at least one photo-sensitive cell that captures this photosensitive unit along optical axis direction, and, calculate the actual total optical path distance of this photo-sensitive cell to this object position with a default object position.Step 2: apart from after deducting the correction light path, obtain to revise the total optical path distance with this actual total optical path.Step 3:, mark off vertically first center line of this optical axis with this correction total optical path distance half.Step 4: capture at least the first end points and at least the second end points of this lens unit along this optical axis direction, calculate length of lens.Step 5:, mark off vertically second center line of this optical axis with this length of lens half.Step 6: assemble this lens unit and this shell block unit, and make this second central lines in this first center line.
The assemble method of optical module of the present invention comprises the following step: step 1: this photosensitive unit is installed in this shell block unit; Step 2: the direction along vertical this optical axis places the opening of this lens unit by this shell block unit in this shell block unit; Step 3: second central lines that makes this lens unit is in this first center line, and the acquisition location.
Effect of the present invention is to reach the alignment methods that overlaps this first, second center line by the mode of side direction assembling, promotes alignment precision, reaches assembling, aligning efficient.
Description of drawings
Fig. 1 is the cutaway view of No. 6169564 cases of explanation U.S. Pat;
Fig. 2 is the three-dimensional exploded view of the preferred embodiment of explanation optical module of the present invention;
Fig. 3 is the assembled sectional view of the preferred embodiment;
Fig. 4 is the schematic diagram of the total optical path distance in the preferred embodiment;
Fig. 5-1, Fig. 5 the-the 2nd, MTF characteristic relation figure;
Fig. 6-1, Fig. 6 the-the 2nd, MTF characteristic relation figure;
Fig. 7-1, Fig. 7 the-the 2nd, the MTF characteristic relation figure of the preferred embodiment;
Fig. 8 is aligning, the assembling flow path figure of the preferred embodiment;
Fig. 9 is first assembling stereogram of the preferred embodiment;
Figure 10 is the cutaway view of the aforementioned assembling stereogram of the preferred embodiment;
Figure 11 is second assembling stereogram of the preferred embodiment; And
Figure 12 is the combination stereogram of the preferred embodiment.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Consult Fig. 2, Fig. 3, the preferred embodiment of optical module of the present invention is the optical system that is applied in optical input device, and a relative sheet glass 9 projection sources.This glass 9 has the end face 91 of a bearable object.This optical module comprises: shell block unit 3, photosensitive unit 4 and lens unit 5.
This shell block unit 3 is to extend along X-direction, and has a shell 31 probably taking the shape of the letter U, mounts a pedestal 32 being fastened on this shell 31, runs through two keepers 33 and a slice cover plate 34 of two ends of this shell 31 and this pedestal 32.This shell 31 has the opening 311 that is formed on a side and extends along this X-direction.This pedestal 32 has mutually involutory and defines first pair of component 322 and second pair of component 323 of slot 321, and this second pair of component 323 is liftoffly to engage with this first pair of component 322 by the opening 311 of this shell 31 is detachable.Aforementioned keeper 33 is to be resisted against on the member of fixing this glass 9.This cover plate 34 is openings 311 of detachable this shell 31 of liftoff sealing.
This photosensitive unit 4 is to be installed in this shell 31, and has a plurality of photo-sensitive cells 41 of arranging and can receive towards Z axle (being optical axis) direction light along this X-axis.Aforementioned photo-sensitive cell 41 is respectively CMOS (Complementary Metal Oxide Semiconductor) image sensing element (Image Sensor) at present embodiment.
This lens unit 5 is to be plugged in first, second slot 321 to 322,323 of components of this pedestal 32, consults Fig. 4, and has a plurality of lens pillars 51 of arranging along this X-axis.But aforementioned lens pillar 51 has graded index and focused ray, can make light path (object distance) L of light source by the incident of object position
0Refract to light path (image distance) L of this photo-sensitive cell 41 after being equivalent to focus on
0And light is length of lens Z along the distance of Z-direction by aforementioned lens pillar 51
0, whereby, aforementioned as can be known photo-sensitive cell 41 along the desirable total optical path of this Z-direction apart from TC=2L
0+ Z
0
Consult Fig. 3, Fig. 4, but because light source can be because the difference of incident medium refractive index, and cause the difference of image space, therefore, aforementioned photo-sensitive cell 41 is along the correction apart from the image space that refractive index causes of this glass 9 of the necessary consideration of TC ' of the actual total optical path of this Z-direction, this is revised light path Δ R and can be obtained by formula h (1-1/n), wherein h is a thickness of glass, and n is a glass refraction, or is obtained by easy actual measurement, that is to say that actual total optical path is apart from TC '=TC+ Δ R.
What deserves to be mentioned is, in the industry cycle, most important performance pointer is called " modulation transfer function " (Modulation Transfer Function in this optical module projection quality, MTF), be the generally acknowledged pointer of industry as the optical element resolving power, MTF (%) index is higher, represents image quality better.Therefore, consult the MTF performance plot (acquisition is from the NSG:NIPPON SHEET GLASS of SLA manufacturer) of Fig. 5-1, Fig. 5-2～Fig. 7-1, Fig. 7-2, can find, as long as object distance (object position) changes the relative position of (as Fig. 5-1, Fig. 5-2) or this lens unit 5 and this photosensitive unit 4 and changes (as Fig. 6-1, Fig. 6-2), then MTF (%) index will sharply descend, and that is to say lens unit of the prior art, as long as skew is arranged slightly, will influence MTF (%) index.But, consult Fig. 7-1, Fig. 7-2, if can make the position of 1/2Z0 at 1/2TC, even then the variable in distance of TC is in hundreds of microns scope, MTF (%) index still can reach near desirable theoretical value, keeps splendid optical imagery quality.
Below promptly be described as follows at the alignment methods and the number of assembling steps of the preferred embodiment of the present invention:
Step 61: consult Fig. 8, Fig. 9, this photosensitive unit 4 is installed in this shell 31, the first pair of component 322 with this pedestal 32 fixes on this shell 31 again, and the photo-sensitive cell 41 of this photosensitive unit 4 is emerging in the opening 311 of this shell 31 with this slot 321.
Step 62: consult Fig. 9, Figure 10 and Figure 11, with two sensitization coupling element (ChargeCoupled Device, CCD, figure does not show) see through the opening 311 of this shell 31, along this Z axle is that the optical axis direction acquisition is positioned at two photo-sensitive cells 41 of both sides, and is formed on two object position reference point 331 of aforementioned keeper 33.Because the present invention is with the benchmark of aforementioned keeper 33 as when assembling, therefore, aforementioned object position reference point 331 and the object position of presetting i.e. these 91 of glass 9 end faces have default optical path length Z
OR, whereby, can calculate this photo-sensitive cell 41 to this object position, promptly the actual total optical path of glass 9 end faces 91 is apart from TC '.
Step 63: revise light path Δ R with this actual total optical path apart from TC ', obtain to revise the total optical path distance, promptly desirable total optical path is apart from TC.
Step 64: first centre line L 1 that marks off vertical this Z axle with 1/2TC.
Step 65: consult Fig. 8, Fig. 9, with two sensitization coupling elements (Charge CoupledDevice, CCD, figure do not show) along this Z axle, be two first end points 52 and two second end points 53 that optical axis direction captures this lens unit 5, calculate the length of lens Z of this lens unit 5
0
Step 66: consult Fig. 8, Figure 10 and Figure 11, mark off second centre line L 2 of vertical this Z axle with 1/2Z0.
Step 67: draw this lens unit 5 with automation pick and place machine (figure does not show) and place in the slot 321 of this pedestal 32, make second centre line L 2 of this lens unit 5 coincide with this first centre line L 1 along the opening 311 of Y direction by this shell 31.
Step 68: consult Fig. 8, Figure 11, with bond in advance first pair of component 322 of this lens unit 5 and this pedestal 32 of viscose glue.
Step 69: by the opening 311 of this shell 31, this second pair of component 323 placed in this shell 31, and involutory, this lens unit 5 is stable in this first, second slot 321 to 322,323 of components with this first pair of component 322.
Step 70: consult Figure 12,, finish and aim at and assembling with the opening 311 of this this shell 31 of cover plate 34 involutions.
Consult Fig. 7, Figure 10, whereby, the present invention can make the position of 1/2Z0 at 1/2TC, so that actual total optical path apart from TC ' even variable in distance in hundreds of microns scope, MTF (%) index still can reach near the ideal theory value, that is to say, special aligning of the present invention, assemble method, allow 4 errors that have by a small margin of object position and this photosensitive unit, but still can keep splendid image quality, identical, after the refractive index of considering glass, though light source of the present invention is not equal to the light path that refracts to this photo-sensitive cell 41 after the focusing by the light path of object (this glass 9) position incident, still can not influence image quality of the present invention.
According to the above as can be known, optical module of the present invention and aligning thereof, assemble method have following advantages and effect:
1. 5 need of this lens unit are drawn merely and the action of putting (Pick﹠Place), therefore generally electronic component (SMT Pick﹠Place Machine) or crystal grain (Die) placement machine (SMT) were aimed at and assembling operation with interior finishing 10 seconds, not only can significantly simplify aligning, assembly program, the reduction activity duration, and effective improving production efficiency, significantly reduce cost, meet economic benefit.
And the present invention can obtain quite the optical system of high theoretical value near MTF (%), effective improving optical characteristic is so that high-resolution optical module product is achieved.
Claims (12)
1. the alignment methods of an optical module, this optical module comprises the shell block unit, is fixed on the photosensitive unit in this shell block unit, and make the lens unit of light-resource fousing at this photosensitive unit, this lens unit has a plurality of lens pillars, but aforementioned lens pillar has graded index and focused ray, thereby refract to the light path of this photosensitive unit after making light source be equivalent to focus on by the light path of an object position incident, this alignment methods comprises the following step:
Step 1: capture at least one photo-sensitive cell of this photosensitive unit along optical axis direction, and, calculate the actual total optical path distance of this photo-sensitive cell to this object position with a default object position;
Step 2: apart from after deducting the correction light path, obtain to revise the total optical path distance with this actual total optical path;
Step 3:, mark off vertically first center line of this optical axis with this correction total optical path distance half;
Step 4: capture at least the first end points and at least the second end points of this lens unit along this optical axis direction, calculate length of lens;
Step 5:, mark off vertically second center line of this optical axis with this length of lens half; And
Step 6: assemble this lens unit and this shell block unit, and make this second central lines in this first center line.
2. the alignment methods of optical module as claimed in claim 1, it is characterized in that, this step 1 is to be formed on this shell block unit and to have at least one object position reference point of default object distance with this object position, to know the distance of this object position reference point to this object position.
3. the alignment methods of optical module as claimed in claim 2 is characterized in that, this object position reference point has 2 points, is two ends that are formed on this shell block unit along this first center line.
4. the alignment methods of optical module as claimed in claim 2 is characterized in that, this step 1 is the images that capture first, second end points of this photo-sensitive cell, this object position and this lens unit with at least one sensitization coupling element with this step 4.
5. the alignment methods of optical module as claimed in claim 1 is characterized in that, this correction light path is to the image space that refractive index caused of incident medium and obtain according to light source.
6. the alignment methods of optical module as claimed in claim 1 is characterized in that, first end points of this lens unit and second end points have 2 points respectively, is the two ends that are formed on this lens unit along this second center line.
7. optical module is characterized in that it comprises:
Photosensitive unit has at least one photo-sensitive cell of sensing light source;
The shell block unit, two keepers of two ends have a shell that this photosensitive unit is set, mount a pedestal being fastened on this shell, running through this shell and this pedestal and a slice cover plate, this shell has an opening that is formed on a side and extends along its length, this pedestal has mutually involutory and defines first pair of component and second pair of component of slot, this second pair of component is that the first pair of component of this opening and this by this shell engages this opening of this cover closure; And
Lens unit, be plugged in this slot, and this photosensitive unit is interposed on this pedestal relatively, and be emerging in this opening, and have a plurality of lens pillars, but aforementioned lens pillar has graded index and focused ray, thereby refracts to the light path of this photosensitive unit after making light source be equivalent to focus on by the light path of an object position incident;
Whereby, see through this opening and along optical axis direction this photo-sensitive cell to object position is deducted the center of revising behind the light path again and divide first center line is arranged, make this first central lines in second center line by this lens unit center.
8. optical module as claimed in claim 7 is characterized in that, has default object distance between an object position of aforementioned keeper and this light source.
9. optical module as claimed in claim 7 is characterized in that, the photo-sensitive cell of this photosensitive unit is that Line Chart is as sensing member.
10. the assemble method of an optical module as claimed in claim 7 comprises the following step:
Step 1: this photosensitive unit is installed in this shell block unit;
Step 2: the direction along vertical this optical axis places the opening of this lens unit by this shell block unit in this shell block unit; And
Step 3: second central lines that makes this lens unit is in this first center line, and the acquisition location.
11. the assemble method of optical module as claimed in claim 10, it is characterized in that, the assemble method of this optical module also includes step 2-1, and this step 2-1 is after this lens unit places this shell block unit, in advance with fixed this lens unit of viscose glue and this shell block unit.
12. the assemble method of optical module as claimed in claim 10 is characterized in that, this step 2, the 3rd, and the relative position of this photosensitive unit and this lens unit is observed and calculated to the opening that sees through this shell block unit with the automation pick and place machine, and pick and place this lens unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100080311A CN101242471B (en) | 2007-02-05 | 2007-02-05 | Optical module and its alignment and assembly method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100080311A CN101242471B (en) | 2007-02-05 | 2007-02-05 | Optical module and its alignment and assembly method |
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| Publication Number | Publication Date |
|---|---|
| CN101242471A CN101242471A (en) | 2008-08-13 |
| CN101242471B true CN101242471B (en) | 2010-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100080311A Expired - Fee Related CN101242471B (en) | 2007-02-05 | 2007-02-05 | Optical module and its alignment and assembly method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI630432B (en) * | 2017-06-29 | 2018-07-21 | 致伸科技股份有限公司 | Multi-lens camera module and assembling process thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933181A (en) * | 1995-03-29 | 1999-08-03 | Futaba Denshi Kogyo K.K. | Photographic recording apparatus |
| CN1332381A (en) * | 2000-07-07 | 2002-01-23 | 日本板硝子株式会社 | Imaging device |
| US6597512B2 (en) * | 2000-09-22 | 2003-07-22 | Nippon Sheet Glass Co., Ltd. | Rod lens array for line scanning |
| CN1534327A (en) * | 2003-04-01 | 2004-10-06 | �Ҵ���˾ | Requlatable scanning module |
| CN1661415A (en) * | 2004-02-25 | 2005-08-31 | 东友科技股份有限公司 | Scanning module capable of fine adjusting optical path |
-
2007
- 2007-02-05 CN CN2007100080311A patent/CN101242471B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5933181A (en) * | 1995-03-29 | 1999-08-03 | Futaba Denshi Kogyo K.K. | Photographic recording apparatus |
| CN1332381A (en) * | 2000-07-07 | 2002-01-23 | 日本板硝子株式会社 | Imaging device |
| US6597512B2 (en) * | 2000-09-22 | 2003-07-22 | Nippon Sheet Glass Co., Ltd. | Rod lens array for line scanning |
| CN1534327A (en) * | 2003-04-01 | 2004-10-06 | �Ҵ���˾ | Requlatable scanning module |
| CN1661415A (en) * | 2004-02-25 | 2005-08-31 | 东友科技股份有限公司 | Scanning module capable of fine adjusting optical path |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2000-32214A 2000.01.28 |
| JP特开平4-117862A 1992.04.17 |
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Owner name: UNIVERSAL GLOBAL SCIENTIFIC INDUSTRIES CO., LTD. Owner name: HUANXU ELECTRONICS CO., LTD. Free format text: FORMER OWNER: HUANLONG ELECTRIC CO LTD Effective date: 20110214 |
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Effective date of registration: 20110214 Address after: 201203 Shanghai Zhangjiang hi tech park, Zhang Road No. 1558 Co-patentee after: Universal Global Scientific Industries Co., Ltd. Patentee after: Huanxu Electronics Co., Ltd. Address before: Taiwan Nantou County Chinese Patentee before: Huanlong Electric Co., Ltd. |
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