CN201374756Y - Light guiding system for contact-type image sensor - Google Patents
Light guiding system for contact-type image sensor Download PDFInfo
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- CN201374756Y CN201374756Y CN200920007329U CN200920007329U CN201374756Y CN 201374756 Y CN201374756 Y CN 201374756Y CN 200920007329 U CN200920007329 U CN 200920007329U CN 200920007329 U CN200920007329 U CN 200920007329U CN 201374756 Y CN201374756 Y CN 201374756Y
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Abstract
A light guiding system used for a contact-type image sensor comprises a long light guide plate and an ultraviolet light source, wherein a sand sprayed layer with unequal density is arranged on the bottom surface of the long light guide plate; and the ultraviolet light source is arranged on one side of a short edge of the long light guide plate, the density of the sand sprayed layer increases in the direction far away from the ultraviolet light source, and after being scattered through the sand sprayed layer, the ultraviolet light produced by the ultraviolet light source is emitted from one side opposite to the sand sprayed layer in the long light guide plate.
Description
[technical field]
The utility model be relevant a kind of contact-type image sensor (contact image sensor, CIS), the light-conducting system of relevant especially a kind of contact-type image sensor.
[background technology]
Contact-type image sensor generally is used for photovoltaic such as scanner, facsimile machine and photocopier, is a kind of rather common image sensor.Contact-type image sensor mainly by light-emitting diode (lightemitting diode, LED), condenser lens, and photosensitive unit constitute.When carrying out scanning document, light-emitting diode as light source with irradiate light to file, incident ray through the reflection or transmission after, reverberation or transmitted light focus to photosensitive unit by condenser lens, by handling the current generated signal of photosensitive unit, can obtain the image information after file scans.
Tradition is used the contact-type image sensor of red blue green LED as light source, can be applied in the scanning of generic-document, but, red blue green LED originally must be substituted by ultraviolet light (ultraviolet light) light source if will be applied in the false proof layout that scans banknote or identity card the time.Contact-type image sensor is usually designed to strip as the usefulness that scans file, and for producing rectangular light belt, industry is generally taked the light guide plate design, and the light that red blue green LED produces evenly transmits to irradiate rectangular light belt in light guide plate.Yet the plastics of traditional light guide plate use can't pass through the irradiation of ultraviolet light for a long time, because plastics for a long time itself can rotten, variable color and easily crisp after UV-irradiation.And the lighting angle of ultraviolet light-emitting diodes is less, can't be applied in the purpose that scans false proof layout and reach only by red blue green LED originally is replaced into ultraviolet-ray diode.If the use ultraviolet-ray diode, total must redesign.
At present, adopt the contact-type image sensor of ultraviolet source, usually many ultraviolet-ray diodes are packaged in the elongated housing 10 shown in the 1st figure, and according to the desired size of client (as A4, A5, A6, A8), ultraviolet-ray diode is arranged in the form of array, must selects the ultraviolet-ray diode of ad eundem brightness during arrangement for use.Shown in the 2nd figure, ultraviolet-ray diode 22 forms a line in the y direction, is noted that, ultraviolet-ray diode 22 is lined up array format, the non-row that only limit to.In addition because the lighting angle of ultraviolet-ray diode is less, the light uniformity when improving bright dipping, ultraviolet-ray diode must be arranged very dense.
Present stage is difficult to control effectively the light uniformity of whole piece elongated light belt because be subject to the lighting angle of ultraviolet-ray diode and the relation of brightness.The design of the contact-type image sensor of above-mentioned employing ultraviolet source, the blanking bar that intrinsic interval (gap) produced when entire scan result still had and arranges because of ultraviolet-ray diode, cause the not good situation of the bright dipping time uniformity, thereby when causing scanning file, the image quality that is drawn is not good.
In addition, the about New Taiwan Currency of ultraviolet-ray diode is 15 at present, 3.5 of the about New Taiwan Currencies of red blue green LED, the expensive three to four-fold of the redder blue green LED unit price of ultraviolet-ray diode.The design of the contact-type image sensor of above-mentioned employing ultraviolet source, because need to use numerous ultraviolet-ray diode to line up array, maximum production cost can drop on the ultraviolet-ray diode.
In view of the disappearance of the contact-type image sensor of above-mentioned employing ultraviolet source, the technical staff explores and improves.
[summary of the invention]
One of the utility model purpose is to provide a kind of light-conducting system that contact-type image sensor uses ultraviolet source that is used for.
Another purpose of the utility model is to improve the not good situation of the contact-type image sensor bright dipping time uniformity.
Another purpose of the utility model is to reduce the quantity that contact-type image sensor uses ultraviolet-ray diode, to reduce production costs.
According to the above-mentioned purpose of the utility model, the utility model provides a kind of light-conducting system that is used for contact-type image sensor, and this light-conducting system comprises an elongated light guide plate and a ultraviolet source.Ultraviolet source is located at one of elongated light guide plate minor face side, and the bottom surface of elongated light guide plate has the sandblast layer that a density does not wait.The density distribution of sandblast layer is with increasing away from the direction of ultraviolet source, the ultraviolet light of ultraviolet source generation after the scattering of sandblast layer, in the elongated light guide plate with respect to the outgoing of one of sandblast layer side.
The utility model is one side, and the layer that sandblasts is divided into several zones, and each regional density increases in the ascending power mode according to the direction away from this ultraviolet source.In another execution mode, sandblast the layer density distribution with apart from the proportional relation of the length square of ultraviolet source.
The utility model on the other hand, this light-conducting system more comprises a lampshade and a reflector plate.Lampshade is located at around the ultraviolet source and is offered an opening, is used for the ultraviolet light that ultraviolet source produces is sent to a specific direction.Reflector plate has a reflecting surface towards this layer that sandblasts, and is used for the ultraviolet light that the light reflection ultraviolet light source produces.This elongated light guide plate has more a guiding angle surface, and guiding angle surface is formed in the elongated light guide plate with respect to one of this sandblast layer side, is used for the predetermined direction that leads of the ultraviolet light from the outgoing of elongated guide plate.
In the utility model, can adopt glass is the material of this elongated light guide plate, and can adopt ultraviolet-ray diode as this ultraviolet source.Because it is the material of this elongated light guide plate that the utility model adopts glass, compared to the plastics of traditional light guide plate use, the light guide plate of the utility model not can because of for a long time through UV-irradiation go bad, variable color, easily crisp.
In the utility model, the light-conducting system of contact-type image sensor only need use a ultraviolet-ray diode, therefore use numerous ultraviolet-ray diode to line up array compared to tradition, the utility model can reduce the quantity of using ultraviolet-ray diode greatly, and whole production cost greatly reduces.In the utility model, because of light-conducting system only need use a ultraviolet-ray diode, intrinsic interval when not having tradition and using numerous ultraviolet-ray diodes to arrange does not cause the not good situation of the bright dipping time uniformity to take place so can not produce blanking bar.Therefore, utilize the light-conducting system of the utility model contact-type image sensor, when scanning file, the raising that the image quality that is drawn is showing.In addition,, can reduce power consumption, have the advantage of environmental protection and energy saving because the light-conducting system of the utility model only need use a ultraviolet-ray diode.
[description of drawings]
Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated.
The 1st figure shows the schematic diagram of the elongated housing of contact-type image sensor.
The 2nd figure shows that traditional contact-type image sensor adopts the schematic diagram of the ultraviolet-ray diode that is arranged in array format.
The 3rd figure shows the schematic diagram of light-conducting system of the contact-type image sensor of the utility model.
4a figure shows that the density distribution of sandblast layer increases with the direction away from ultraviolet-ray diode.
4b figure shows that the sandblast layer is divided into several zones, and each regional density increases in the ascending power mode according to the direction away from ultraviolet-ray diode.
4c figure show sandblast the density distribution of layer with apart from the proportional relation of the length square of ultraviolet-ray diode.
The 5th figure shows that the light-conducting system of the utility model is in the schematic diagram in contact-type image sensor x-z cross section.
[embodiment]
See also the 3rd figure, this figure is the schematic diagram of light-conducting system of the contact-type image sensor of the utility model.The contact-type image sensor of the utility model is designed to strip for producing rectangular light belt, and light-conducting system is packaged in elongated housing 10 shown in the 1st figure, and wherein the light-conducting system shown in the 3rd figure is the schematic diagram of contact-type image sensor in the y-z cross section.This light-conducting system mainly comprises ultraviolet-ray diode 32, lampshade 34, elongated light guide plate 35, reaches reflector plate 355.Ultraviolet-ray diode 32 is arranged at one of elongated light guide plate 35 minor faces side, can produce to be used to scan the required ultraviolet light of special type file (as the false proof layout of banknote or identity card).The bottom surface of elongated light guide plate 35 has a sandblast layer 350 through blasting treatment, and the ultraviolet light that ultraviolet-ray diode 32 sends is after 350 scattering of sandblast layer, certainly with respect to the outgoing of one of sandblast layer 355 side.Because employed light source is ultraviolet source, elongated light guide plate 35 can adopt glass material, and light guide plate can go bad after UV-irradiation to avoid for a long time, variable color, easily crisp.After the size (as A4, A5, A6, A8) of foundation customer demand decision contact-type image sensor, select the high elongated housing 10 of corresponding length and width, and, carry out glass and cut this elongated light guide plate 35 of making according to the specification that elongated housing 10 is preset.Lampshade 34 is located at around the ultraviolet-ray diode 32 and is offered an opening, is used for the ultraviolet light that ultraviolet-ray diode 32 produces is sent to a specific direction, for example towards the direction of elongated light guide plate 35.Reflector plate 355 has a reflecting surface towards this layer that sandblasts, and is used for the ultraviolet light that light reflection ultraviolet diode 32 produces.Lampshade 34 and reflector plate 355 can adopt the metal material or the reflector plate of silver plating film.When scanning file, the ultraviolet light that ultraviolet-ray diode 32 sends can be directly through 350 scattering of sandblast layer, or through reflector plate 355 reflections again after 350 scattering of sandblast layer, from respect to the outgoing of one of sandblast layer 355 side.
See also 4a figure, this figure shows that the density distribution of sandblast layer 350 increases with the direction away from ultraviolet-ray diode 32.Because ultraviolet-ray diode 32 is a point source of light, apart from point source of light more at a distance, its optical density distributes more little.Generally speaking, the density of sandblast layer 350 is higher, can scattering light the more.The light uniformity when reaching bright dipping, in the elongated light guide plate 35 sandblast layer 350 apart from ultraviolet-ray diode 32 part far away that heals, its density height of should healing, the ultraviolet light that sends with balance ultraviolet-ray diode 32 is through the light quantity of sandblast layer 350 scattering.When ultraviolet light from respect to the bright dipping of one of sandblast layer 350 side the time, the brightness of bright dipping is evenly distributed.
See also 4b figure, this figure shows that sandblast layer 350 is divided into several zones, and wherein each regional density increases in the ascending power mode according to the direction away from ultraviolet-ray diode 32.In an embodiment, the layer that sandblasts 350 is divided into six zones, and the areal concentration near ultraviolet-ray diode 32 is 0, and all the other each regional density ratios are 1: 2: 3: 4: 5.
See also 4c figure, this figure show sandblast the density distribution of layer 350 with apart from the proportional relation of the length square of ultraviolet-ray diode 32.Because ultraviolet-ray diode 32 is a point source of light, the point source of light optical density distributes and becomes inverse square with distance, modern density distribution by the layer 350 that will sandblast is with the length of distance ultraviolet-ray diode 32, with square increase of this length, to make up for the influence that ultraviolet light falls sharply with distance.For example, sandblast layer 350 density distribution for shown in 4c figure, having the characteristic that is square increase with the length of distance ultraviolet-ray diode 32.
See also the 5th figure, this figure shows that the light-conducting system of the utility model is in the schematic diagram in contact-type image sensor x-z cross section.Shown in the 5th figure, elongated light guide plate 35 has a guiding angle surface 51, guiding angle surface 51 is formed in the elongated light guide plate 35 with respect to one of sandblast layer 350 side, has with the lead function of a predetermined direction of the ultraviolet light from 35 outgoing of elongated guide plate, so that ultraviolet light is incident to file to be scanned exactly.
Claims (15)
1, a kind of light-conducting system that is used for contact-type image sensor, its feature is at what, and this system comprises:
One elongated light guide plate, its bottom surface have the sandblast layer that a density does not wait; And
One ultraviolet source is located at one of this elongated light guide plate minor face side,
Wherein the density distribution of this sandblast layer is with increasing away from the direction of this ultraviolet source, the ultraviolet light of this ultraviolet source generation after this sandblast layer scattering, certainly in this elongated light guide plate with respect to the outgoing of one of this sandblast layer side.
2, light-conducting system according to claim 1, its feature are at what, and this system more comprises:
One lampshade is located at around this ultraviolet source and is offered an opening, is used for the ultraviolet light that this ultraviolet source produces is sent to a specific direction.
3, light-conducting system according to claim 1, its feature are at what, and this system more comprises:
One reflector plate has a reflecting surface towards this layer that sandblasts, and is used to reflect the ultraviolet light that this ultraviolet source produces.
4, light-conducting system according to claim 1, its feature is at what: this elongated light guide plate has more a guiding angle surface, this guiding angle surface is formed in this elongated light guide plate with respect to one of this sandblast layer side, is used for ultraviolet light with this elongated guide plate outgoing certainly predetermined direction that leads.
5, light-conducting system according to claim 1, its feature are at what: this layer that sandblasts is divided into several zones, and each regional density increases in the ascending power mode according to the direction away from this ultraviolet source.
6, light-conducting system according to claim 5, its feature are at what: this layer that sandblasts is divided into six zones, and the areal concentration near this ultraviolet source is essentially zero, and all the other each regional density ratios are 1: 2: 3: 4: 5.
7, light-conducting system according to claim 1, its feature are at what: this sandblast the density distribution of layer with apart from the proportional relation of the length square of this ultraviolet source.
8, light-conducting system according to claim 1, its feature are at what: the material of this elongated light guide plate is a glass.
9, light-conducting system according to claim 1, its feature are at what: this ultraviolet source is the diode that sends ultraviolet light.
10, a kind of light-conducting system that is used for contact-type image sensor, its feature is at what, and this system comprises:
One elongated glass light guide plate, its bottom surface has the sandblast layer that a density does not wait;
One ultraviolet-ray diode is located at one of this elongated glass light guide plate minor face side; And
One reflector plate has a reflecting surface towards this layer that sandblasts, and is used to reflect the ultraviolet light of this ultraviolet-ray diode generation,
Wherein the density distribution of this sandblast layer is with increasing away from the direction of this ultraviolet-ray diode, and the ultraviolet light of this ultraviolet-ray diode generations reflects after this sandblast layer scattering through this reflector plate again, certainly in this elongated glass light guide plate with respect to the outgoing of one of this sandblast layer side.
11, light-conducting system according to claim 10, its feature are at what: this layer that sandblasts is divided into several zones, and each regional density increases in the ascending power mode according to the direction away from this ultraviolet-ray diode.
12, light-conducting system according to claim 11, its feature are at what: this layer that sandblasts is divided into six zones, and the areal concentration near this ultraviolet-ray diode is essentially zero, and all the other each regional density ratios are 1: 2: 3: 4: 5.
13, light-conducting system according to claim 10, its feature are at what: this sandblast the density distribution of layer with apart from the proportional relation of the length square of this ultraviolet-ray diode.
14, light-conducting system according to claim 10, its feature are at what: this system more comprises:
One lampshade is located at around this ultraviolet-ray diode and is offered an opening, is used for the ultraviolet light that this ultraviolet-ray diode produces is sent to a specific direction.
15, light-conducting system according to claim 10, its feature is at what: this elongated glass light guide plate has more a guiding angle surface, this guiding angle surface is formed in this elongated glass light guide plate with respect to one of this sandblast layer side, is used for ultraviolet light with this elongated glass guide outgoing certainly predetermined direction that leads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920007329U CN201374756Y (en) | 2009-02-12 | 2009-02-12 | Light guiding system for contact-type image sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920007329U CN201374756Y (en) | 2009-02-12 | 2009-02-12 | Light guiding system for contact-type image sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201374756Y true CN201374756Y (en) | 2009-12-30 |
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ID=41500837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920007329U Expired - Lifetime CN201374756Y (en) | 2009-02-12 | 2009-02-12 | Light guiding system for contact-type image sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201374756Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102271210A (en) * | 2011-07-07 | 2011-12-07 | 威海华菱光电有限公司 | Contact image sensor |
| CN105141802A (en) * | 2015-09-16 | 2015-12-09 | 威海华菱光电股份有限公司 | Ultraviolet light transmission light source and image reading device |
-
2009
- 2009-02-12 CN CN200920007329U patent/CN201374756Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102271210A (en) * | 2011-07-07 | 2011-12-07 | 威海华菱光电有限公司 | Contact image sensor |
| CN102271210B (en) * | 2011-07-07 | 2017-02-08 | 威海华菱光电股份有限公司 | Contact image sensor |
| CN105141802A (en) * | 2015-09-16 | 2015-12-09 | 威海华菱光电股份有限公司 | Ultraviolet light transmission light source and image reading device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091230 |