CN1658010A

CN1658010A - scanner

Info

Publication number: CN1658010A
Application number: CN2004100050990A
Authority: CN
Inventors: 李达义; 张荣乔
Original assignee: Lite On Technology Corp
Current assignee: Lite On Technology Corp
Priority date: 2004-02-17
Filing date: 2004-02-17
Publication date: 2005-08-24

Abstract

The present invention relates to a scanner which can avoid the disadvantage of a traditional scanner using a cold cathode fluorescent lamp as a light source, which causes a long warm-up time. The scanner of the present invention uses a light emitting diode as a light source to greatly shorten the warm-up time, and is equipped with components such as a cylindrical lens, a reflective surface, a brightness enhancement sheet or a diffusion sheet to enhance and make uniform the brightness of the light emitting diode.

Description

Scanner

Technical field

The present invention relates to a kind of scanner, particularly a kind of scanner of using LED as light source.

Background technology

Scanner is the input equipment that is widely used in computing machine except that keyboard and mouse.You can utilize scanner input photo and set up the electronic album of oneself; Import various pictures and set up the website of oneself; Scanning hand-written letter sends to replace facsimile recorder with E-mail again; Can also utilize scanner to cooperate the content of OCR (Optical Character Recognition, i.e. optical character identification) software input newspaper or books, exempt the arduous of Chinese characters for keyboard inputting.All these has showed the function that scanner is out of the ordinary for us, and its let us has improved efficient at aspects such as office, study and amusements.

Process from the image digitazation of scanner, fluorescent tube emits beam, shine on the reflection contribution on the scanner glass plate, difference according to the local bright dark degree of contribution difference, form the strong and weak reflection ray that does not wait, then by a row catoptron, focus on the CCD of the camera lens other end, CCD is converted to corresponding electric signal with optical signalling, it is simulating signal, these signals finally are converted into the digital signal that computing machine can be discerned by A/D converter, then through different interfaces, EPP (EnhancedParallel Port, i.e. enhancement mode parallel port) for example, USB (Universal Serial Bus, be USB (universal serial bus)) or SCSI (Small Computer System Interface, i.e. computer system interface) be sent to computing machine.

A/D converter is the semiconductor element that analog simulation amount (Analog) is changed into digital quantity (Digital).The electric signal that obtains from CCD is the simulate signal corresponding to the image light and shade, and image is by secretly representing that to bright variation they are continually varyings with different potentials from low to high, promptly so-called emulation amount in other words.

Yet for scanner, light source is very important, because the light of being experienced on the CCD, all comes from the fluorescent tube of scanner self.Impure or the colour cast of light source can directly have influence on scanning result.Specialty scanner or family expenses or commercial scanner that some are high-end, before scanning, can detect the light intensity that fluorescent tube sends automatically, particularly when scanner just activates, because fluorescent tube does not enter steady state (SS), scanner has certain preheating time, have only the light intensity of working as enough to reach standard, the light source detection sensor in the machine just can send by instruction.And scanner at this moment could scan with the duty of the best, because if the fluorescent tube light intensity can't effectively show the dark portion details in the original copy inadequately.

And the lamp source that traditional scanner uses when the major defect of this kind fluorescent tube promptly is to start shooting at every turn, needs with briliancy with fluorescent tube slowly be promoted to stable status one period foregoing preheating time all based on cathode fluorescent tube (CCFL).This section takes about 1-3 minute and do not wait at normal temperatures preheating time, and be not only tediously long and make the user be difficult to stand, and often to cause the user to take for be that system works as machine and requires handling return, this situation under low temperature environment especially obviously and serious.

In view of this, how to take into account under the situation of quality, effectively and fast scanning and preview are being provided, and reducing the stand-by period before the cold machine scanning, becoming everybody the common target of pursuing then.

Summary of the invention

Fundamental purpose of the present invention is provides a kind of with the scanner of LED as light source, uses to solve the long shortcoming of conventional scanners warm-up period.

In order to reach above-mentioned purpose, scanner of the present invention utilizes LED lamp group to launch light, and pass light-passing board and shine on the object to be scanned, while is according to the difference of the different local bright dark degree of scanned object, form the strong and weak reflection ray that does not wait, reflection ray passes light-passing board again and by reflector group light reflect focalization to image sensor is carried out sensing then.Specifically, scanner of the present invention comprises: a LED lamp group, formed by at least more than one LED lamp, in order to as light source; One light-passing board, a side be corresponding to this LED lamp group, and opposite side is corresponding to object to be scanned, and the light that this LED lamp group is sent exposes to object to be scanned by this light-passing board; One reflector group is made up of at least more than one catoptron, exposes to the light that is reflected behind the object to be scanned in order to be received from this LED lamp group, and gives suitable reflect focalization; And an image sensor, in order to being received from the light that this reflector group reflects, and export after the optical signalling that receives is converted to analog electrical signal.

Image sensor herein is charge-coupled image sensor (CCD, Charge Couple Device).

In addition, the contiguous place of LED lamp group can be provided with at least more than one cylindrical lens, and then the light that sent of LED lamp group can be done suitable refraction and focus to this light-passing board by this cylindrical lens, to obtain briliancy performance enough and that homogeneity is good.

In addition, LED lamp group except that can by be provided with cylindrical lens with increase and the uniform brilliance performance, also can be by more than one at least reflecting surface being set in its peripheral appropriate position, make light that LED lamp group sent can be by reflecting surface with discrete light reflect focalization to this light-passing board, thereby obtain briliancy performance enough and that homogeneity is good.

And, scanner of the present invention also can be provided with more than one at least brightening piece or diffusion sheet by the contiguous appropriate position in LED lamp group, make light that LED lamp group sent can be by this brightening piece or diffusion sheet with discrete light focusing to this light-passing board, thereby the distribution of light that LED lamp group is sent is more even, reaches the purpose that improves brightness.Above-mentioned cylindrical lens, reflecting surface, brightening piece and diffusion sheet all are arranged between the optical path of this LED light lamp group and this light-passing board.

Description of drawings

Fig. 1 is the first embodiment synoptic diagram of scanner of the present invention;

Fig. 2 is the second embodiment synoptic diagram of scanner of the present invention; And

Fig. 3 is the 3rd embodiment synoptic diagram of scanner of the present invention.

Wherein, description of reference numerals is as follows:

11 light-passing boards

12 LED lamp groups

13 reflector group

14 image sensors

15 cylindrical lens

16 reflectings surface

17 brightening pieces

Embodiment

For making purpose of the present invention, structural attitude and function thereof have been obtained understanding further, now have been described with reference to the accompanying drawings as follows:

Please refer to shown in Figure 1ly, be the first embodiment synoptic diagram of scanner of the present invention, as shown in the figure:

This scanner includes a light-passing board 11, a LED lamp group 12, a reflector group 13 and an image sensor 14 and forms.

This LED lamp group 12 is made up of at least more than one LED lamp, in order to as light source, emits beam.

These light-passing board 11, one sides are corresponding to LED lamp group 12, and opposite side is corresponding to object (not shown) to be scanned, and then the light that sent of LED lamp group 12 can expose to object to be scanned by this light-passing board 11.

This reflector group 13 is made up of at least more than one catoptron, exposes to the light that is reflected behind the object to be scanned in order to be received from LED lamp group 12, and gives suitable reflect focalization.

This image sensor 14 is charge-coupled image sensor (CCD, Charge Couple Device), in order to being received from the light that reflector group 13 is reflected, and exports after the optical signalling that receives is converted to simulating signal.

CCD is the abbreviation of Charge Couple Device, is called charge-coupled image sensor, and it is the surface light electrical part that utilizes microelectric technique to make, and can realize photoelectric converting function.CCD is widely used in video camera, digital camera and scanner, that only use in the video camera is dot matrix CCD, comprise that promptly x, y both direction are used to absorb plane picture, and what use in the scanner is linear CCD, it has only direction of x, and the y scanning direction is finished by the mechanical hook-up of scanner.Many photosensitive units are arranged on the CCD chip, and they can convert different light to different electric charges, thereby form the charge image of corresponding original copy light image.If we want to increase the resolution of image, just must increase the photosensitive unit quantity on the CCD.In fact, the performance of CCD has determined the optical resolution of the x direction of scanner.

The light source that scanner of the present invention is taked replaces traditional cathode fluorescent tube with LED lamp group, and LED is the abbreviation of light emitting diode (Light Emitting Diode).Electronic component that can be luminous when LED is energising, it is the light-emitting component that semiconductor material is made, material uses III-V family's chemical element (as: gallium phosphide (GaP), gallium arsenide (GaAs) etc.), principle of luminosity is to convert electrical energy into light, just compound semiconductor is applied electric current, by combining of electronics and hole, superfluous energy can disengage with the form of light, reach luminous effect, it is luminous to belong to cold property, and the life-span reached more than 100,000 hours.

Since LED need not warm-up period (idling time) and reaction velocity very fast, so can effectively solve the long shortcoming of cathode fluorescent tube warm-up period, thereby improve the speed of preview and scanning, significantly reduce the stand-by period that cold machine scans.

Because LED is generally pointolite and luminance shortage, but scanner needs line source or area source to make things convenient for the carrying out of scanning operation usually, so scanner of the present invention is satisfied the contiguous place in LED lamp group 12, it is the cylindrical lens 15 that is provided with at least more than one between the optical path of LED lamp group 12 and this light-passing board, the light that sent of LED lamp group 12 then, can do suitable refraction by this cylindrical lens 15, to obtain briliancy performance enough and that homogeneity is good.

Therefore, the principle of work of scanner of the present invention is, earlier object (not shown) to be scanned is placed in a side of light-passing board 11, the LED lamp group 12 that is positioned at light-passing board 11 opposite sides then promptly emits beam, the light that is sent is after cylindrical lens 15 is reflected focusing, promptly passing light-passing board 11 shines on the scanned object, and according to the difference of the different local bright dark degree of scanned object, form the strong and weak reflection ray that does not wait, reflection ray passes light-passing board 11 again and by reflector group 13 light reflect focalization to image sensor 14 is carried out sensing then.

Please refer to shown in Figure 2, the second embodiment synoptic diagram for scanner of the present invention, as shown in the figure: scanner of the present invention except that can by be provided with cylindrical lens 15 with increase and the briliancy performance of even LED lamp group 12, also can be by peripheral appropriate position in LED lamp group 12, be that more than one at least reflecting surface 16 is set between the optical path of LED lamp group 12 and this light-passing board, the light that sent of LED lamp group 12 then, can show thereby obtain briliancy enough and that homogeneity is good by reflecting surface 16 with discrete light reflect focalization.

Please refer to shown in Figure 3 again, the 3rd embodiment synoptic diagram for scanner of the present invention, as shown in the figure: scanner of the present invention also can be by the contiguous appropriate position in LED lamp group 12, be that more than one at least brightening piece 17 (BEF are set between the optical path of LED lamp group 12 and this light-passing board, Brightness Enhancement Film) or diffusion sheet (Diffuser), so that the distribution of light that LED lamp group 12 is sent is more even, reach the purpose that improves brightness.

Though the present invention with aforesaid preferred embodiment openly as above; so it is not in order to limit practical range of the present invention; any those skilled in the art; the equalization of doing according to aforementioned preferred embodiment changes and modification; be all the scope of patent protection that claims of the present invention define and contain, therefore scope of patent protection of the present invention is as the criterion with the scope that claims were defined.

Claims

1. scanner, it includes:

One LED light lamp group is made up of at least more than one LED light lamp, in order to as light source;

One light-passing board, a side be corresponding to this LED light lamp group, and opposite side is corresponding to object to be scanned, and the light that this LED light lamp group is sent exposes to object to be scanned by this light-passing board;

One reflector group is made up of at least more than one catoptron, exposes to the light that is reflected behind the object to be scanned in order to be received from this LED light lamp group, and gives suitable reflect focalization; And

One image sensor in order to being received from the light that this reflector group reflects, and is exported after the optical signalling that receives is converted to analog electrical signal.

2. scanner as claimed in claim 1 is characterized in that, this image sensor is a charge-coupled image sensor.

3. scanner as claimed in claim 1, it is characterized in that, also include at least more than one cylindrical lens, this cylindrical lens is arranged to reflect and focuses on light that this LED light lamp group the sent contiguous appropriate position to this LED light lamp group of this light-passing board.

4. scanner as claimed in claim 3 is characterized in that, this more than one cylindrical lens is arranged between the optical path of this LED light lamp group and this light-passing board.

5. scanner as claimed in claim 1, it is characterized in that, also include at least more than one reflecting surface, this reflecting surface is arranged on the light that can this LED light lamp group of reflect focalization the be sent peripheral appropriate position to this LED light lamp group of this light-passing board.

6. scanner as claimed in claim 5 is characterized in that, this more than one reflecting surface is arranged between the optical path of this LED light lamp group and this light-passing board.

7. scanner as claimed in claim 1, it is characterized in that, also include at least more than one brightening piece, this brightening piece is arranged at and can focuses on light that this LED light lamp group the sent contiguous appropriate position to this LED light lamp group of this light-passing board.

8. scanner as claimed in claim 7 is characterized in that, this more than one brightening piece is arranged between the optical path of this LED light lamp group and this light-passing board.

9. scanner as claimed in claim 1, it is characterized in that, also include at least more than one diffusion sheet, this diffusion sheet is arranged at and can focuses on light that this LED light lamp group the sent contiguous appropriate position to this LED light lamp group of this light-passing board.

10. scanner as claimed in claim 9 is characterized in that, this more than one diffusion sheet is arranged between the optical path of this LED light lamp group and this light-passing board.