CN2689459Y - Image sensors - Google Patents
Image sensors Download PDFInfo
- Publication number
- CN2689459Y CN2689459Y CNU2003201197885U CN200320119788U CN2689459Y CN 2689459 Y CN2689459 Y CN 2689459Y CN U2003201197885 U CNU2003201197885 U CN U2003201197885U CN 200320119788 U CN200320119788 U CN 200320119788U CN 2689459 Y CN2689459 Y CN 2689459Y
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- China
- Prior art keywords
- imageing sensor
- array
- signal
- receiving unit
- light receiving
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Abstract
Disclosed is an image sensor, comprising a diffraction grating array, a grating array, a light reception unit, and a signal processing circuit board. Light goes through the diffraction grating array, then makes a vertical incidence to the microlens array, and later makes an incidence to the light reception unit. The received light signal is converted to an electrical signal by the light reception unit, and the electrical signal is processed by the signal processing circuit board to form an image output signal. The image sensor has the advantages of simple structure and higher image picking quality by adopting the structure.
Description
[technical field]
The utility model is about a kind of imageing sensor, especially about a kind of imageing sensor that is used for the numerical camera mould in mobile phone or the PDA portable electron devices such as (Personal Digital Assistant, personal digital assistants).
[background technology]
Recently, along with CPU (Central Processing Unit, central processing unit) the significantly improving of performance, image processing techniques develops rapidly, electronic installations such as mobile phone, PDA or computer have all had very high Digital Image Processing ability, and the image data transmission between each device is also often carried out, and is also developed rapidly as the imageing sensor of image pick-up device thereupon.Along with electronic installations such as mobile phone, PDA are day by day popular, people are more and more to the application of image pickup function, and are also more and more higher to the requirement of the quality of captured image.
See also Fig. 1, the conventional images transducer mainly comprises over cap 10, microlens array 30, colorful optical filter array 50, light receiving unit 70 and signal processing circuit board 90.Wherein, over cap 10 is positioned at the front end of imageing sensor, generally adopts plate glass or transparent resin to make, and is not subjected to external force or pollutant effects in order to inner each element of protection imageing sensor.Microlens array 30 is the arrays that are arranged in two-dimensional space by a plurality of lenticules, and it can strengthen the light intensity of the light that is incident to light receiving unit 70.But colorful optical filter array 50 filtering part incident lights, it generally includes red, green and blue filter or green grass or young crops, purple and yellow filter, this filter arrays pixel of corresponding light receiving unit 70 is respectively arranged, to obtain color information, coloured image can obtain by making up from all output signals of pixel.Light receiving unit 70 is made up of a plurality of pixel elements of arranging in two-dimensional space, and each pixel is a photo-electric conversion element, and it converts the light signal that receives to the signal of telecommunication.Signal processing circuit board 90 is in order to driving pixel, and the signal of telecommunication that pixel produces is handled, and forms picture output signal.
During captured image, light passes over cap 10, after microlens array 30 converges; pass colorful optical filter array 50; be incident to light receiving unit 70, light receiving unit 70 converts the light signal that receives to the signal of telecommunication, obtains picture output signal after signal processing circuit board 90 is handled.
Because the numerical camera mould in the portable electron devices such as mobile phone or PDA is small-sized, slimming is its development trend, thereby its image distance is also very short, and the angle that makes picture side's chief ray becomes big, make the bigger light of part incident angle after microlens array 30 converges, be incident upon on the dead space of light receiving unit 70, the illumination of the fringe region of light receiving unit 70 is reduced, the picture quality that makes numerical camera mould pick up reduces.
Therefore, press for a kind of simple in structure, imageing sensor that the image pickup quality is higher is provided.
[summary of the invention]
The purpose of this utility model is to provide a kind of simple in structure, imageing sensor that the image pickup quality is higher.
To achieve these goals, the utility model provides a kind of imageing sensor, comprise array of diffraction gratings, microlens array, light receiving unit and signal processing circuit board, vertical incidence was to light receiving unit after light passed array of diffraction gratings, light receiving unit converts the light signal that receives to the signal of telecommunication, signal processing circuit board is handled the signal of telecommunication, forms picture output signal.
Compare with existing imageing sensor, the utility model imageing sensor changes the optical path direction of incident ray by array of diffraction gratings, make the bigger light of its incident angle also can enter in the active zone of light receiving unit, the light intensity of the light signal that the edge of light receiving unit receives is increased, thereby can improve its image quality.In addition, the utility model imageing sensor only increases array of diffraction gratings, and structure is simpler.
[description of drawings]
Fig. 1 is the light path schematic diagram of conventional images transducer.
Fig. 2 is the structural representation of the utility model imageing sensor.
Fig. 3 is the light path schematic diagram of the utility model imageing sensor.
Fig. 4 is the light vectogram of the array of diffraction gratings of the utility model imageing sensor.
[embodiment]
Please refer to shown in Figure 2ly, the utility model imageing sensor 100 mainly comprises over cap 110, infrared ray colour filter film 120, array of diffraction gratings 130, microlens array 140, colorful optical filter array 150, light receiving unit 170 and signal processing circuit board 190.
Over cap 110 is positioned at the upper end of imageing sensor 100, generally adopts plate glass or transparent resin to make, and is immobilizated in imageing sensor 100 inner each element in order to protection and is not subjected to external force or pollutant effects.These over cap 110 upper stratas are coated with infrared ray colour filter film 120, and this infrared ray colour filter film 120 is a multi-layer film structure, with the filtering infrared ray.These over cap 110 lower floors are provided with array of diffraction gratings 130.This array of diffraction gratings 130 is the circular grating of a plurality of tool concentric circles patterns.
Array of diffraction gratings 130 can change the optical path direction of incident ray.This array of diffraction gratings 130 can be set according to the light maximum incident angle that is incident to this grating, make the light that is positioned at this maximum angle of deflection scope after array of diffraction gratings 130 changes light path, but vertical incidence makes the bigger light of incident angle also can enter in the active zone of light receiving unit 170 to microlens array 140.Each circular grating of this array of diffraction gratings 130 all corresponding to the pixel of the light receiving unit 170 that vertically is positioned at its below, therefore has different diffraction characteristics and optical parameter.This array of diffraction gratings 130 can design according to coupled wave theory, is design basis with the vectogram of diffracted ray.Please in conjunction with consulting Fig. 3 and Fig. 4, the incident light vector is K
In, the light vector is K after array of diffraction gratings 130
Out, then K is arranged according to coupled wave theory
Out=K
In+ K.This K is the vector of diffraction grating, can be used as the design parameter of this array of diffraction gratings 130.
Microlens array 140 is the arrays that are arranged in two-dimensional space by a plurality of lenticules, and it can strengthen the light intensity of the light that is incident to light receiving unit 170.
But colorful optical filter array 150 filtering part incident lights it typically is red, green and blue primary filter or green grass or young crops, purple and yellow complementary color filter.This filter arrays 150 pixel of corresponding light receiving unit 170 is respectively arranged, and makes it obtain color information, and coloured image can obtain by making up from all output signals of pixel.
Signal processing circuit board 190 comprises that be A/D (Analog/Digital, the analog/digital) transducer of digital signal and the digital signal processing unit that utilizes digital signal formation picture output signal in order to drive pixel with the drive circuit of picked up signal electric charge, in order to the switching signal electric charge.
During the assembling camera, the utility model imageing sensor 100 is placed camera lens (figure does not show) rear, make array of diffraction gratings 130 be positioned at the focal plane position of lens imaging.During captured image, light passes over cap 110 behind infrared ray colour filter film 120 filtering infrared rays, image in the plane at array of diffraction gratings 130 places.After after the array of diffraction gratings 130 change light paths, vertical incidence is to microlens array 140.Light passes colorful optical filter array 150 then, is incident to light receiving unit 170, and light receiving unit 170 converts the light signal that receives to the signal of telecommunication, obtains picture output signal after signal processing circuit board 190 is handled.
Be appreciated that the colorful optical filter array 150 of the utility model imageing sensor 100 not only is confined to be arranged in the below of microlens array 140, also can be arranged in its top.If imageing sensor is not to be used for colour imaging, colorful optical filter array 150 can omit.
Claims (10)
1. imageing sensor, comprise a microlens array, one light receiving unit and a signal processing circuit board, this microlens array is arranged in two-dimensional space by a plurality of lenticules and is formed, this light receiving unit is arranged in two-dimensional space by a plurality of pixel elements and is formed, it is characterized in that: this imageing sensor further comprises an array of diffraction gratings, this array of diffraction gratings comprises a plurality of diffraction grating, this array of diffraction gratings, this microlens array, the setting of arranging successively from top to bottom of this light receiving unit and this signal processing circuit board, diffraction grating vertically is positioned at its corresponding pixel element top, vertical incidence was to microlens array after light passed array of diffraction gratings, be incident on the light receiving unit afterwards, light receiving unit converts the light signal that receives to the signal of telecommunication, signal processing circuit board is handled the signal of telecommunication, forms picture output signal.
2. imageing sensor as claimed in claim 1 is characterized in that: this imageing sensor further comprises an over cap, and it is positioned at the upper end of imageing sensor.
3. imageing sensor as claimed in claim 2 is characterized in that: this over cap adopts plate glass or transparent resin to make, and its upper strata is coated with infrared ray colour filter film.
4. imageing sensor as claimed in claim 1 is characterized in that: this array of diffraction gratings is the circular grating of a plurality of tool concentric circles patterns, and this circular grating can be set according to the light maximum incident angle that is incident to this grating.
5. imageing sensor as claimed in claim 1 is characterized in that: this imageing sensor further comprises a colorful optical filter array.
6. imageing sensor as claimed in claim 5 is characterized in that: this colorful optical filter array is red, green and blue filter or green grass or young crops, purple and yellow filter.
7. imageing sensor as claimed in claim 5 is characterized in that: this colorful optical filter array is positioned at above-mentioned microlens array below.
8. imageing sensor as claimed in claim 5 is characterized in that: this colorful optical filter array is positioned at above-mentioned microlens array top.
9. imageing sensor as claimed in claim 1 is characterized in that: each pixel of this light receiving unit is a photo-electric conversion element.
10. imageing sensor as claimed in claim 1 is characterized in that: this signal processing circuit board comprises that be the A/D converter of digital signal and the digital signal processing unit that utilizes digital signal formation picture output signal in order to drive pixel with the drive circuit of picked up signal electric charge, in order to the switching signal electric charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201197885U CN2689459Y (en) | 2003-12-19 | 2003-12-19 | Image sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201197885U CN2689459Y (en) | 2003-12-19 | 2003-12-19 | Image sensors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2689459Y true CN2689459Y (en) | 2005-03-30 |
Family
ID=34661931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201197885U Expired - Lifetime CN2689459Y (en) | 2003-12-19 | 2003-12-19 | Image sensors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2689459Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020052063A1 (en) * | 2018-09-10 | 2020-03-19 | 北京小米移动软件有限公司 | Camera module, processing method and apparatus, electronic device, and storage medium |
-
2003
- 2003-12-19 CN CNU2003201197885U patent/CN2689459Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020052063A1 (en) * | 2018-09-10 | 2020-03-19 | 北京小米移动软件有限公司 | Camera module, processing method and apparatus, electronic device, and storage medium |
| US11425299B2 (en) | 2018-09-10 | 2022-08-23 | Beijing Xiaomi Mobile Software Co., Ltd. | Camera module, processing method and apparatus, electronic device, and storage medium |
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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: 20131219 Granted publication date: 20050330 |