CN2519559Y - Contact-type imaging sensor - Google Patents
Contact-type imaging sensor Download PDFInfo
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- CN2519559Y CN2519559Y CN 02212070 CN02212070U CN2519559Y CN 2519559 Y CN2519559 Y CN 2519559Y CN 02212070 CN02212070 CN 02212070 CN 02212070 U CN02212070 U CN 02212070U CN 2519559 Y CN2519559 Y CN 2519559Y
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- light
- light source
- lens
- contact
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Abstract
The utility model relates to a contact-type image sensor which solves the problems of prior contact-type image sensors under high-speed reading conditions such as lowered output signal, the difficulty effective output and recognition of characters, the deteriorated resolution of images, comprising at least the following parts: a light source which can send light and irradiate light on to a manuscript, a lens for collecting the manuscript reflected light, a light sensing part for receiving the collected light of the lens, and a frame for accommodating the light source, the lens, and the light sensing part. The light source is longitudinal. The utility model can be widely applied to the reading field of a plurality of images.
Description
Technical field: the utility model relates to a kind of image read-out, is a kind of contact-type image sensor specifically.
Background technology: Fig. 6 is the sectional drawing of existing contact-type image sensor.1 is light source among the figure, the 2nd, hold the framework of light source 1, the 3rd, lens, the 4th, the photoelectric sensor of receiver lens 3 light that converges, the 5th, the sensor base plate of the photoelectric sensor 4 that lift-launch is arranged in a straight line, the 6th, glass plate, the 7th, hold the framework of framework 2, lens 3, sensor base plate 5, glass plate 6, the 8th, original copy, the 9th, the image of the literal of putting down in writing on the original copy etc., the 10th, conveyance original copy 8 reaches for the correct set rubber roll of reading images of energy.The 11st, the socket that image information on the output original copy 8 and power supply and other input/output signal are used, the 12nd, the electronic unit that signal processing is used, the 13rd, the reflecting coating that light source is provided with below, the 14th, the reflector that on lens 3, sets in advance.
In above-mentioned contact-type image sensor, the light that light source 1 sends, see through glass plate 6, be radiated on the image (literal) 9 on the original copy 8, black region light at literal is absorbed, and in other white undercolor region of original copy, light almost 100% is reflected, these reverberation pass glass plate 6 again, collected by lens 3, shine the photosensitive area of the photoelectric sensor 4 on the sensor base plate 5, photoelectric sensor 4 is that many photosensitive areas and the light that can will shine each photosensitive area carry out opto-electronic conversion, and the drive circuit of signal output is formed.The light that receives converts telecommunications to after overdrive circuit output as image information, is outwards exported by socket 11 at last, rubber roll 10 rotation conveyance original copys 8, and the image information of being put down in writing on original copy 8 (literal) will be read continuously.
But in above-mentioned contact-type image sensor, it is closer that the position of light source and original copy is provided with, and lens also must be like this near being provided with, so the angle of emergence of the light that light source sends is than higher.When at a high speed reading the lens that used thickness is bigger under the situation, the optical axis of lens has increased from the distance of light source, thereby the strong beam position of the light that light source sends has also increased from the distance of the optical axis of lens.Owing to there is this problem, the light that sends from light source arrives effective light quantity minimizing of image (literal) position that will read, thereby causes reflection light quantity to reduce, and under situation about reading at a high speed, the signal of output reduces more serious that this problem becomes.
Because the light shooting angle of light source is bigger, also directly enter in the lens from lens some invalid light far away, it is difficult that effective output of literal etc. and identification become.The deterioration of the resolution of image becomes more outstanding when reading at a high speed.
Summary of the invention: technical problem to be solved in the utility model is: even provide a kind of when reading at a high speed, it reads precision and does not also worsen, and can carry out the contact-type image sensor that image information accurately reads.The utility model comprises following each several part at least: can send light and make illumination be mapped to light source on the original copy, collect the catoptrical lens of original copy, receive the framework that said lens converges the photographic department of light and can hold fixing above-mentioned light source, lens and photographic department, light source is the longitudinal type light source, and it can be located at the both sides of lens.The effect of utility model
The utility model is owing to used the longitudinal type light source, so have following effect: 1) because change light source into longitudinal type by lateral type, the shooting angle of light reduces than original, under the shooting angle that is about 45 degree, even the optical axis of lens increases from the distance of light source, also can access maximum intensity of illumination.
Because light source changes the longitudinal type light source into, even in the lens both sides light source is set, the sectional drawing of contact-type image sensor is also similar with existing contact-type image sensor, and it is light to make contact-type image sensor continue maintenance dose, small and exquisite characteristics
Description of drawings:
Fig. 1 is a sectional drawing of the present utility model.
Fig. 2 is the light source performance specification figure of existing common contact-type imageing sensor.
Fig. 3 is the light source of existing common contact-type imageing sensor and the key diagram of lens relation.
Fig. 4 is the utility model light source performance specification figure.
Fig. 5 is the sectional drawing of the utility model embodiment 2.
Fig. 6 is the sectional drawing of existing common contact-type imageing sensor.
In Fig. 1: the 101st, longitudinal type light source (longitudinal type LIGHT GUIDE), the 102nd, hold the framework of longitudinal type light source, 103 is 2 row lens, the 4th, the photoelectric sensor of receiver lens 3 light that converges, the 5th, sensor base plate, the 6th, glass plate, the 7th, framework, the 8th, original copy, the 9th, the image on the original copy 8 (literal), the 10th, rubber roll, the 11st, socket, the 12nd, electronic unit, the 13rd, reflecting coating, the 14th, reflector.
With reference to Fig. 2, the section structure of this light source is indulged to (H) narrow for horizontal (W).The ejaculation position of a light is arranged in addition, and miter angle is processed at this position usually, and all light all penetrate from this position.Though but penetrate the position is the structure of miter angle, the ejaculation angle of actual glazing is not 45 degree, penetrates angle usually and is greater than 45 degree.Because the luminescence chip of this light source is the end that is placed on light source, the reflecting surface that is called as reflectance coating that the light that luminescence chip sends is set in advance on the direction of propagation carries out irregular reference, penetrating the position ejaculation then, the angle of the light of ejaculation depends on the incidence angle when the light source interior lights incides the injection part site surface.Usually this is a kind of incident at random.In these incident lights, be directly incident on the light (being called direct reverberation) that penetrates the position and account for main component by the reflectance coating reflection.If but for the ejaculation angle that reduces light with the reflectance coating of light source bottom away from penetrating the position, the ejaculation efficient of light will reduce.In this case, if when using thicker lens as shown in Figure 3, depart from the main ejaculation position of the optical axis of lens and light source, causes the light quantity reduction that enters lens, and some unnecessary scattered lights also might enter lens, generation hot spot phenomenon.
With reference to Fig. 4, the utility model adopts the longitudinal type light source, and to incide the light that penetrates the position be not direct reverberation but indirect reference light accounts for main component in light source inside.Promptly be printed with reflectance coating in the bottom surface of light source, light incides the injection part surface behind the interreflection of the side of light source inside, thereby makes from the shooting angle of the light that penetrates the existing light source of light ratio that comes out at the position low.
Table 1 is the light source of existing light source and the utility model embodiment 1, near the surface of intensity distribution of measuring the optical axis of lens.Maximal illumination of the present utility model is compared with existing light source, its position deviation 1mm.If the section configuration with light source is that height H and width W are represented, just has this effect during H＞W.In embodiment 1 of the present utility model, the structure of light source is H=2W.
Table 1
Fig. 5 is the embodiment that light source 101 is provided with in the lens both sides, for the optical axis place at lens obtains stronger light quantity, in the lens both sides light source is set, and can make more light quantity shine the original copy surface.And because used the longitudinal type light source, even place light source in the lens both sides, the section structure of whole contact-type image sensor is also basic identical with existing contact-type image sensor.
In addition, owing to placed light source in the lens both sides, can make one of them light source be set to RGB 3 looks, another light source is set to infrared light, makes contact-type image sensor can carry out heterogeneous light reading.The different colored light that certain each light source is disposed use light-emitting diode usually, are arranged on an end of light source or the end at two ends, and it is suitable that it can be changed to easily.
In the embodiment of utility model embodiment shown in Figure 11, the focal position of lens is arranged on the optical axis position on glass plate 6 surfaces, but the focal position of lens can not exceed with glass plate yet, promptly also can portion disposed thereon.
In addition, glass plate 6 is for the conveyance original copy and prevent that foreign matter from falling into contact-type image sensor and causing bad characteristic setting.Not existing original copy conveyance and foreign matter to sneak under the situation of problem, also can not use glass plate 6.
When lens are respectively 1 row and 2 whens row, the difference to lens thickness is illustrated, wherein mainly is to serve as to lead to be illustrated with 2 row lens.But even use thin lens, because under the situation of using thin lens, the adjustment of the strong position of lens axis and light also realizes easily, therefore also can use thin lens.
Claims (2)
1, a kind of contact-type image sensor, at least comprise following each several part: can send light and make illumination be mapped to light source on the original copy, collect the catoptrical lens of original copy, receive the framework that said lens converges the photographic department of light and can hold fixing above-mentioned light source, lens and photographic department, it is characterized in that light source is the longitudinal type light source.
2, contact-type image sensor according to claim 1 is characterized in that the longitudinal type light source is located at the both sides of lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02212070 CN2519559Y (en) | 2002-01-05 | 2002-01-05 | Contact-type imaging sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02212070 CN2519559Y (en) | 2002-01-05 | 2002-01-05 | Contact-type imaging sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2519559Y true CN2519559Y (en) | 2002-10-30 |
Family
ID=33691808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02212070 Expired - Fee Related CN2519559Y (en) | 2002-01-05 | 2002-01-05 | Contact-type imaging sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2519559Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101990052A (en) * | 2010-12-03 | 2011-03-23 | 威海华菱光电有限公司 | Contact type image sensor |
-
2002
- 2002-01-05 CN CN 02212070 patent/CN2519559Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101990052A (en) * | 2010-12-03 | 2011-03-23 | 威海华菱光电有限公司 | Contact type image sensor |
| CN101990052B (en) * | 2010-12-03 | 2015-12-02 | 威海华菱光电股份有限公司 | A kind of contact-type image sensor |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20021030 Termination date: 20110105 |