CN1069975C - Optical path device for image reading - Google Patents

Abstract

An optical path device for reading an image, comprising: the four reflection lenses are fixed at the upper, lower, front and rear corners in the host shell; the lens box comprises a light source, a first reflector, a lens and a light sensing element, wherein light emitted by the light source is projected to a file to be scanned arranged on the main machine shell, and then reflected light sequentially passes through the first reflector, each reflector, the lens and the light sensing element to form a continuous optical path. By installing each reflection lens on the set position of the main frame, the part of the optical path in the lens box is reduced, and the miniaturization of the lens box is achieved, and the purpose of the miniaturization of the scanner is achieved.

Description

Optical path device for image reading

The present invention relates to an optical path device for image reading, in particular to an optical path device for image reading that minimizes the size of the lens box and reduces the volume of the scanner.

Referring to FIG. 1, FIG. 1 is a schematic diagram of an optical path device of a known scanner 2, the optical path of which is included in the optical path device 21, and the optical path device 21 is covered with a housing 211, because the optical path device 21 The volume is quite large, and because the optical path device 21 requires an action space (scannable range) 22 in the scanner 2, and for scanning documents of the same length, the longer optical path device 21 must reserve more actions space 22 , so under the condition of documents to be scanned of the same size, the volume of the optical path device 21 determines the volume of the scanner 2 .

Under the current trend of thinness and shortness, in order to reduce the volume of the scanner, there is a method of reducing the volume of the optical path device, such as Taiwan Patent Publication No. 303037; referring to Figure 2, the optical path device 32 mainly includes; a light source unit 33 , a reflection unit 31 , a lens 35 , and a charge-coupled device 36 . Wherein the light source unit 33 can provide the "light" required for the imaging of the optical path device 32, and the reflection unit 31 mainly includes a first reflector 311 and a second reflector 312, which can make the "light" four times After four or more reflections, the "light" can be collected by the lens 35 and imaged on the charge-coupled device 36, and converted into a digital signal that can be stored and processed by a computer. Although the above method has reduced the required reflective mirrors to two, the optical path for light travel is still included in the optical path device 32, so the optical path device 32 is still large and occupies a considerable volume in the scanner.

In addition, the scanner 4 of Taiwan Patent Publication No. 312363 adopts a transmission device, and the devices in the lens box are respectively arranged on different modules to move simultaneously. With reference to Fig. 3, the scanner 4 mainly includes: a first base 47, a light source 43 and a first reflector 44 are placed therein; a second base 48, a lens 45 and a sensing element 46 are placed therein ; and a second reflector 411 and a third reflector 412 are respectively fixed on a casing 40 . Under the condition of the same optical path length, compared with the present invention, the volume of this invention is still larger than that of the present invention, and the detailed description will be described below.

As for scanners that use CIS (Contact Image Sensor) as a module, because the current CIS is limited in resolution (because of the limited technology of the columnar lens array), it is still necessary to use CCD (charge sensor) to increase the resolution. coupler) mode.

In order to solve the above problems, the present invention provides an optical path device for image reading, which is installed in a main body casing, including: four reflective mirrors, fixedly installed at the upper, lower, front and rear corners of the main body casing; A lens box, including a light source, a first reflector, a lens, and a photosensitive element, etc., after the light emitted by the light source is projected onto the components arranged on the main body casing, the reflected light passes through the first reflector in sequence The mirror, each of the reflecting mirrors, the lens and the photosensitive element form a continuous optical path. By installing each of the reflecting mirrors on the fixed position of the main body casing, the part of the optical path in the lens box is reduced, and the miniaturization of the lens box is achieved, thereby achieving the purpose of miniaturization and weight reduction of the scanner.

Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of an optical path device of a known scanner;

Fig. 2 is a schematic diagram of a scanner of Taiwan Patent Gazette Announcement No. 303037;

Fig. 3 is a schematic diagram of a scanner of Taiwan Patent Gazette Announcement No. 312363;

Figure 4 is a schematic diagram of the present invention; and

Fig. 5 is a schematic diagram of two L-shaped lamp tubes arranged in a "mouth" shape.

Referring to Fig. 4, Fig. 4 is a schematic diagram of the present invention, an optical path device for image reading, installed in a host housing 10, including: four reflecting mirrors 121, 122, 123, 124, fixedly mounted on At the four corners of the front, rear, up and down in the main body housing 10; a lens box 11, including a light source 13, a first reflector 14, a lens 15, and a photosensitive element 16, etc., the light projection emitted by the light source 13 After arriving at the components arranged on the main body housing 10, the reflected light passes through the first reflector 14, reflector mirrors 121, 122, 123, 124, the lens 15 and the photosensitive element 16 in sequence to form a continuous optical path path.

By means of the above method, the reflectors 121, 122, 123, 124 are mounted on the fixed position of the main body casing 10, so that the optical path between the reflectors is excluded from the lens box 11, so that the lens box 11 is minimized, and then To achieve the purpose of minimizing the scanner.

With reference to Fig. 3 and Fig. 4, known device 4 is compared with the present invention again, discusses from the angle of simplified structure, the present invention only utilizes a lens box, and known device 4 then utilizes two bases to move back and forth, therefore in structure The present invention is relatively simplified; the known device 4 uses two bases, so its control variables are also more complicated than the present invention. Secondly, as can be seen from the figure, the optical path length of the known device 4 is the sum of a horizontal length and a vertical length of the scanning device, while the optical path of the present invention has the sum of two horizontal lengths and two vertical lengths; therefore , under the same volume condition, the optical path of the present invention is longer, which reduces the distortion of the obtained image, that is, the image quality is improved; that is, when the known device 4 intends to achieve the same optical path as the present invention to improve the image quality , the volume needs to be increased.

In addition, in order to solve the problem of energy attenuation caused by the long travel distance of the lens, the applicant has already proposed methods such as supplementary light film and coating on the reflective lens (COATING) in the previous case to increase part of the brightness; in addition, it can also directly start from improving the brightness of the light source , with two L-shaped lamp tubes 5 correspondingly installed into a "mouth" font (referring to Figure 5), the bending part of the lamp tube can be used to reinforce the lack of brightness on both sides of the lamp tube, and the brightness of the light source can also be improved simultaneously. Moreover, the vertical width of the scanner can be reduced in this way, which also contributes to the reduction of the volume, because the general scanner lengthens the lamp tube in order to increase the brightness at both ends.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (5)

1, a kind of image reads the optical path device of usefulness, and it is installed in the host shell, it is characterized in that comprising:

Four eyeglasses are fixed at four corners in front and back up and down in this host shell;

One case for lens, include a light source, one first catoptron, a camera lens and a photoinduction element, behind the element that the ray cast that this light source sent is furnished to this host shell, reflected light passes through this first catoptron, respectively this reflecting optics, this camera lens and this photoinduction element in regular turn, to form a continuous light path path;

First catoptron on this case for lens and photoinduction element are becoming vertical mode to be provided with substantially with this optical path device direction of scanning, and can reduce this case for lens lateral length.

2, image as claimed in claim 1 reads the optical path device of usefulness, it is characterized in that, this eyeglass number is four.

3, image as claimed in claim 1 reads the optical path device of usefulness, it is characterized in that, first catoptron on this case for lens all reflects once with this eyeglass respectively.

4, image as claimed in claim 1 reads the optical path device of usefulness, it is characterized in that, this light source includes two fluorescent tubes.

5, image as claimed in claim 4 reads the optical path device of usefulness, it is characterized in that, described fluorescent tube is the L type, and described fluorescent tube installs side by side, and makes described light tube bending place light filling each other.

Images