TWI253840B - Scanner - Google Patents

Abstract

The present invention relates to a scanner which replaces CCFL with LED as a light source so as to solve the problem of excessively long warm-up time of CCFL in the prior art. Meanwhile, objects as rod lens, reflectors, brightness enhancement films (BEF), or diffusers may be applied to enhance and even the brightness of the LED.

Description

1253840

[Technical Field to Which the Invention Is A] The present invention is a scanner, a source scanner. The home is an application of LED as light [Prior Art] The scanner is a device other than a keyboard and a mouse. You can use the scanner to input various pictures to create your own website to send out instead of the fax machine; you can also input the contents of newspapers or books, exempting them from showing us the extraordinary learning and entertainment aspects of the scanner, improving the efficiency from the scanner. The image is digitally illuminated to different degrees of reflection and darkness on the scanner glass plate, forming a strong and weak series of mirrors, focusing on the lens and converting to the corresponding electrical signal, that is, the analog A/D converter is converted into a computer. The interface of the identifiable, such as EPP (Enhanced is widely used in the computer's turn-in photos to build their own electronic albums; 'scanning handwritten letters and then using E~mai ^ to use the scanner to cooperate with the 软CR software keyboard to input Chinese characters. All the features, it keeps us at work,

In the process, the lamp emits light, the light on the manuscript, according to the different parts of the manuscript, and then through the CCD on one end, the CCD will optical signal k number 'these signals finally pass the J digit signal, and then through different Parallel Port) , USB (Universal Serial Bus) or SCSI (Small Computer

System Interface) is transferred to the computer. The A/D converter is a semiconductor element that converts an analog analog quantity (A n a 1 og) into a digital quantity (Digital). The electrical signal obtained from the CCD is an analog signal corresponding to the brightness of the image, that is, the change from dark to light of the image can be expressed by different potentials from low to high, which are continuously changing, so-called

1253840 V. INSTRUCTIONS (2) The analog quantity is lacking. For the scanner, the light source is very important, because the light on the CCD is all from the tube of the scanner. Abnormal light source or color cast 5 will directly affect the scanning results. Professional scanners or some end-use household or commercial scanners will detect the intensity of light emitted by the lamp before scanning, especially when the scanner is not started. The state scanner has _ a certain warm-up time. Only when the light intensity is enough to reach the light source detection sensor in the standard machine will the command pass, and then the scanner can scan at the best working state, because if the light is light The intensity will not be able to effectively show the dark part of the original Λ / τ ie ° and the traditional scanner uses the light source is mainly cold cathode fluorescent tube (CCFL). The main disadvantage of this type of lamp is that each time it is turned on When a preheating time as described above is required to slowly raise the brightness of the lamp to a stable state, this warm-up time At room temperature, it takes about 1 - 3 minutes, which is not only lengthy, but also unbearable to the user and often causes the user to mistake the system for a return and processing. This situation is particularly noticeable and severe in low temperature environments. How to provide effective and fast scanning and previewing while reducing the waiting time before cold-scanning in consideration of quality? It has become a common cause for everyone to pursue. [Inventive content] The main g of the present invention provides an LED as a light source. The scanner solves the shortcomings of the traditional scanner warm-up time. The scanner of the present invention uses the LED lamp set.

Page 6 1253840 V. Description of the invention (3) The light is emitted and irradiated onto the object to be scanned through the light-transmitting plate, and the reflected light of different intensity is formed according to the difference in brightness and darkness of different parts of the scanned object, and then reflected The light then passes through the light transmissive plate and reflects the light through the mirror set to the image sensor for sensing. The image sensor here is a charge coupled device (CCD). In addition, at least one cylindrical lens can be disposed adjacent to the LED light group, and the light emitted by the LED light group can be Appropriate refraction is achieved through the cylindrical lens to obtain sufficient and uniform brightness performance. In addition, the LED lamp group can be provided with a cylindrical lens to increase the uniform brightness performance, and the light emitted by the LED lamp group can be transmitted through the reflection by providing at least one reflection surface at a suitable position on the periphery thereof. The face focuses the discrete light reflections to achieve sufficient and uniform brightness performance. Furthermore, the scanner of the present invention can further provide more uniform light distribution by the LED lamp group by using at least one of the brightness enhancement sheets or the diffusion sheets at appropriate positions adjacent to the LED lamp group, thereby achieving the purpose of improving brightness. . In order to further understand the object, the structural features and the functions of the present invention, the following detailed description will be given with reference to the accompanying drawings: [Embodiment] Please refer to FIG. 1 for a schematic view of a first embodiment of the scanner of the present invention. As shown in the figure: This scanner includes a light transmissive plate 1 1 , an LED light group 1 2 , a reverse

1253840 V. Description of the Invention (4) The group of mirrors 1 3 and an image sensor 14 are composed. The LED light group 12 is composed of at least one LED lamp and is used as a light source to emit light. The light-transmitting plate 1 1 corresponds to the LED lamp group i 2 and the other side corresponds to the object to be scanned (not shown), and the light emitted by the LED lamp group 12 can pass through the light. The light panel 11 is irradiated to the object to be scanned. The mirror group 13 is composed of at least one mirror for receiving the light reflected from the L E D lamp group 12 after being incident on the object to be scanned, and is appropriately reflected and focused. The image sensor 1 4 'is a charge-dissipating device ([cd, C harge couple device) for receiving the light reflected from the mirror group 13' and converting the received optical signal into an analog signal. Output. CCD is an abbreviation of Charge Couple Device, which is called a charge-coupled device. It is a surface optoelectronic device made by microelectronic technology, which can realize photoelectric conversion function. CCDs are widely used in cameras, digital cameras and scanners, except that the camera uses a dot matrix cc D, which includes the X and = directions for capturing flat images, while the scanner uses linearity. Direction, y-direction scanning by the scanner's mechanical device i-conversion = there are many photosensitive cells on the wafer, they can turn different 2" different charges, thus forming a corresponding original light image two: sensitive fruit; they want to increase The resolution of the image must be increased (10). To; in fact, the performance of (10) determines the scanner's - the light source taken by the scanner is replaced by the LED light group

1253840

Cold cathode fluorescent tube, LED is the abbreviation of Light Emitting Diode. The LED is a light-emitting element that is made when it is energized. It is a light-emitting element made of a semiconductor material. The material uses 丨丨丨_v group chemical elements (such as gallium phosphide (GaP), gallium arsenide (GaAs), etc.). The electric sputum is converted into light, that is, a current is applied to the compound semiconductor, and the combination of electrons and holes is used to release excess energy in the form of light to achieve a luminous effect, which is a cold luminescence and has a lifetime of more than 100,000 hours. . Since the LED does not need to be warmed up (id丨丨ng time) and the reaction speed is fast, it can effectively solve the shortcoming of the cold cathode fluorescent lamp warming up time, thereby improving the speed of previewing and scanning, and greatly reducing the cold scanning. waiting time. Since the LED is usually a point source and the brightness is insufficient, the scanner usually requires a line source or a surface source to facilitate the scanning operation, so the scanner of the present invention has at least one column disposed adjacent to the LED group 12. The light emitted by the LED lamp group 12 can be properly refracted by the cylindrical lens 15 to obtain sufficient and uniform brightness performance. Therefore, the operating principle of the scanner of the present invention is that the object to be scanned (not shown) is placed on one side of the light-transmitting plate 1 1 and then the LED light group on the other side of the light-transmitting plate 1 1 . 12, that is, the light is emitted, and the emitted light is refracted and focused by the cylindrical lens 15, that is, it is irradiated to the upper object of the scanned object through the transparent plate 11 and forms a strong and weak reflection according to the difference in brightness and darkness of different parts of the scanned object. Light, then reflected light and then passed through the light-transmitting plate 11 and passed through the opposite

1253840 V. INSTRUCTION DESCRIPTION (6) The lens group 13 focuses the light reflection to the image sensor 14 for sensing. Please refer to FIG. 2, which is a schematic view of a second embodiment of the scanner of the present invention. As shown in the figure, the scanner of the present invention can increase and evenly illuminate the LED lamp set 1 by providing a cylindrical lens 15 . In addition to the luminance performance of 2, at least one reflecting surface 16 can be disposed at a suitable position on the periphery of the LED lamp group 12, and the light emitted by the LED lamp group 12 can be transmitted through the reflecting surface 16 Discrete light is reflected to focus, resulting in sufficient and uniform brightness performance. Referring to FIG. 3 again, it is a schematic diagram of a third embodiment of the scanner of the present invention. As shown in the figure, the scanner of the present invention can be disposed at least in the vicinity of the LED lamp group 12. More than one brightness enhancement film 17 (BEF, brightness enhancement film) or diffusion film (Diffuser), in order to make the light distribution of the LED lamp group 12 more uniform, to achieve the purpose of improving brightness. While the present invention has been described above with respect to the preferred embodiments thereof, it is not intended to limit the scope of the present invention, and the equivalents and modifications may be made without departing from the spirit and scope of the invention. The scope of the invention is covered by the scope of the invention, and the scope of patent protection of the invention is defined by the scope of the patent application attached to the specification.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a first embodiment of a scanner according to the present invention; FIG. 2 is a schematic view showing a second embodiment of the scanner of the present invention; and FIG. 3 is a third embodiment of the scanner of the present invention. A schematic of an embodiment.

[Description of Symbols] 11 Translucent Plate 12 LED Group 13 Mirror Set 14 Image Sensor 15 Cylindrical Lens 16 Reflector 17 Enhancer Page 11

Claims (1)

Ή1253 earn ri case number 93100842 曰 Amendment VI. Patent application scope 1. A scanner comprising: an LED lamp group consisting of at least one LED lamp for use as a light source; at least one column a lens disposed at an appropriate position adjacent to the LED lamp group for refracting light emitted by the LED lamp group; a light transmissive plate having one side corresponding to the LED lamp group and the other The side corresponds to the object to be scanned to be reflected to be received from the appropriate image line 'and 2 · If the device is 3. For Shen less a peripheral suitable discrete light 4 · such as Shen less a Film) object, so that The light emitted by the LED light group is scanned by the light-transmitting plate, and the lens group is composed of at least one mirror for connecting the light reflected by the LED light group to the object to be scanned, and And a sensor for receiving light reflected from the mirror group to convert the received optical signal into an analog signal and outputting the optical signal. The scanner of claim 1, wherein the image is scanned by a charge coupled device (CCD). The scanner of claim 1, further comprising a reflective surface that is disposed at a position of the LED light group through which the LED light group is emitted. Line reflection focusing. The scanner of claim 1 further includes a brightness enhancement sheet (BEF, Brightness Enhancement) disposed adjacent to the LED light group. Page 12 Case No. 93100842 Amendment VI. The scope of application for patents is used to focus the light emitted by the LED light group. 5. The scanner of claim 1, further comprising at least one diffuser (Di f fuser) disposed at an appropriate position adjacent to the LED light set for Focus on the light emitted by the LED light group. Page 13