CN1105984C - Optical scanning module components - Google Patents

Abstract

An optical scanning module is composed of a casing with window, a light sensor in the casing for converting the light from document to image signals, a lens set in the casing and consisting of two parallel tracks in front of said light sensor, two lenses installed to said two tracks in reverse slide mode, and a driver for driving two lenses in opposite directions to move any one lens to light path for focusing the light from document.

Description

Optical scanning module components

The invention relates to an optical scanning module assembly, in particular to an optical scanning module assembly with double lenses.

With the continuous development of computer software and hardware, as well as the demand and popularization of image input, optical scanners are being widely used. Among all kinds of optical scanners, flatbed scanners are the most common, and its scanning module assembly is installed under a transparent platform in a manner that can move back and forth, so as to scan a document placed on the transparent platform. Since the single-lens scanning module has only one resolution, it cannot meet the needs of users for different resolutions required by different files. Therefore, a lot of research is devoted to the development of a single type of scanning module with multiple lenses, so as to achieve the purpose of making a scanning device have multiple resolutions.

Please refer to Figure 1 and Figure 2. 1 and 2 are schematic diagrams of a conventional dual-lens scanning module 10 . The scanning module assembly 10 is installed in an optical scanner (not shown) for scanning an image of a document 12 . The scanning module assembly 10 includes a housing 14 on which a window 16 is arranged to receive light 18 transmitted from the document 12, and a light sensing device 20 is located in the housing 14 to pass the document 12 through The light 18 transmitted by a predetermined optical path is transformed into a corresponding image signal, and a lens group 22 is disposed in the casing 14 for focusing the light 18 onto the light sensing device 20 . The lens group 22 includes two parallel rails 24, 26, which are arranged in front of the light sensing device 20, and the two shells 32, 34 are respectively arranged on the two parallel rails 24, 26 in a slidable manner, and the two lenses 28, 30 are respectively Set in the two casings 32, 34, used to focus the light 18 on the light sensing device 20 in different focusing ways, and a driving device 36, set in the housing 14, used to drive the two in the same direction at the same time. The housings cover the lenses 28 , 30 of the housings 32 , 34 so that the light 18 is focused onto the light sensing device 20 through one of the lenses 28 or 30 .

Due to the requirements of different resolutions, the two lenses 28 and 30 provide different focusing methods to focus the light 18 transmitted from the document 12 on the light sensing device 20 to produce different resolutions. 30 interfere with each other so that light 18 passes through only one lens 28 or 30. Since the two shells 32, 34 move in the same direction, the two parallel rails 24, 26 need to occupy a large space in the housing 14 to avoid the mutual interference of the two lenses 28, 30, thus causing the scanning module 10 to be bulky. question.

The purpose of the present invention is to provide an optical scanning module assembly, which has a double-lens device moving in opposite directions, so as to solve the above-mentioned problem of bulky optical scanning module assembly.

The object of the present invention is achieved by providing an optical scanning module assembly used in an optical scanner to scan document images, which includes: a housing with a window for receiving the The light transmitted from the document; a light sensing device is set in the casing, which is used to convert the light transmitted from the document through a predetermined optical path into a corresponding image signal; a lens group is set in the Inside the casing, it is used to focus the light transmitted from the document onto the light sensing device. The lens group includes: two parallel rails, located in the casing and in front of the light sensing device; two lenses, with The way of sliding in reverse is respectively installed on the two parallel rails; and a driving device is arranged in the casing, and is used to move any lens in the two lenses to the optical path, so that the document transmitted The light from the document is focused on the photo-sensing device through the lens; wherein the two lenses can make the light from the document focus on the photo-sensing device in different focusing ways to produce different resolutions.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 and Fig. 2 are the schematic diagrams of existing dual-lens scanning module assembly;

Fig. 3 is the schematic diagram of scanning module assembly of the present invention;

Fig. 4 is the external view of Fig. 3 lens group;

5 and 6 are schematic diagrams of the scanning module assembly in FIG. 3 .

See Figure 3. It is a schematic diagram of the scanning module assembly 40 of the present invention. The scanning module assembly 40 is used in an optical scanner (not shown) for scanning an image of a document 42 . The scanning module assembly 40 includes a housing 44, which is provided with a window 46 for receiving the light 48 transmitted by the document 42, and a lens group 56 is arranged in the housing 44, and it includes a plurality of mirrors for To guide the light 48 into an optical path 52, a light sensing device 50 is arranged in the casing 44, and is used to convert the light 48 into a corresponding image signal, and a lens group 54 is arranged in the casing 44 for use in to focus the light 48 onto the light sensing device 50 . When the optical scanner scans the image of the document 42, the light 48 transmitted from the document 42 passes through the optical path 52 and the lens group 56, and is focused on the light sensing device 50 to be converted into a corresponding image signal.

Please refer to FIG. 4 , which is a schematic diagram of the lens group 54 . The lens group 54 includes two parallel rails 58, 60, which are arranged in front of the light sensing device 50, and two shells 62, 64, which are respectively arranged on the two parallel rails 58, 60 in a slidable manner, and the two lenses 74, 76 There are different focusing methods, which are respectively arranged in the two casings 62, 64, and a driving device 66 is arranged in the casing 44, which is used to drive the two casings 62, 64 to move any lens 74 or 76 in the two lenses. to light path 52. The light 48 transmitted from the document 42 can be focused on the light sensing device 50 in different focusing ways by the lens 74 or 76 to produce different resolutions.

The driving device 66 includes two runners 68, which are rotatably fixed to the two ends of the two parallel rails 58, 60, and an endless belt 70 is set on the two runners 68 to drive the two shells 62, 64, And a stepper motor 72 is used to drive the endless belt 70 . Since the two shells 62, 64 are installed on the corresponding two sides of the endless belt 70, when the stepper motor 72 rotates the endless belt 70, the two shells 62, 64 will be driven in opposite directions at the same time.

Please refer to FIG. 5 and FIG. 6 . FIG. 5 and FIG. 6 are schematic views of the scanning module 40 in FIG. 3 using the lens 74 or 76 . Figure 5 shows that when the lens 74 is used to focus, that is, when the casing 62 is driven to the left of the track 58, the casing 64 will be driven to the right of the track 60, and the light 48 from the document 42 passes through The lens 74 is focused onto the light sensing device 50 . Figure 6 shows that when the lens 76 is used to focus, that is, when the shell 64 is driven to the left of the track 60, the shell 62 will be driven to the right of the track 58, and the light 48 will be focused to the light transmission through the lens 76. Sensing device 50. Since the two casings 62, 64 are respectively located in opposite directions of the two parallel rails 58, 60, the lenses 74 and 76 will not interfere with each other, and the light 48 from the document 42 can only pass through the lenses 74 or 76 at the same time.

Compared with the existing dual-lens scanning module assembly, the dual lenses used in the scanning module assembly 40 are simultaneously driven in opposite directions by the driving device 66, thereby reducing the required space occupied by the two parallel tracks 58, 60, and also reducing The volume of the scanning module assembly 40 is determined.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the patent of the present invention.

Claims (6)

1. An optical scanning module assembly is used in an optical scanner to scan document images, and it includes: a housing provided with a window for receiving light from the document; A light sensing device, installed in the casing, is used to convert the light transmitted from the document through a predetermined optical path into a corresponding image signal; A lens group is arranged in the casing and is used to focus the light transmitted from the document to the light sensing device, and it is characterized in that the lens group includes: Two parallel tracks are arranged in the housing and located in front of the light sensing device; The two lenses are respectively installed on the two parallel rails in a reverse sliding manner; and a driving device, arranged in the casing, used to move any one of the two lenses to the optical path, so that the light from the document can be focused on the light sensing device through the lens; The two lenses can make the light from the file focus on the light sensing device in different focusing ways to produce different resolutions. 2. The optical scanning module assembly according to claim 1, wherein the two lenses are respectively installed in two casings, and the two casings are movably installed on the two parallel rails, and the driving The device drives the two lenses on the two parallel tracks through the two casings. 3. The optical scanning module assembly according to claim 1, wherein the driving device includes two wheels, which are rotatably fixed to the two ends of the two parallel tracks, and an endless belt is set on the The two rotating wheels are used to drive the two lenses, and when the endless belt is rotated, the two lenses will be driven simultaneously. 4. The optical scanning module assembly according to claim 3, wherein the two lenses of the driving device are installed on the corresponding two sides of the endless belt, so when the endless belt is rotated, the two lenses will move in the opposite direction. 5. The optical scanning module assembly according to claim 4, wherein the driving device further comprises a stepping motor, which is used to drive the endless belt. 6. The optical scanning module assembly according to claim 1, further comprising a lens set disposed in the casing, the lens set includes a plurality of reflectors for passing the light from the document through the The light path passes to the light sensing device.

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