CN2722277Y

CN2722277Y - Focusing module

Info

Publication number: CN2722277Y
Application number: CN 200420087147
Authority: CN
Inventors: 周明德; 周晋弘; 简信堂
Original assignee: Lite On Technology Corp
Current assignee: Lite On Technology Corp
Priority date: 2004-08-23
Filing date: 2004-08-23
Publication date: 2005-08-31
Anticipated expiration: 2014-08-23

Abstract

The utility model relates to a focusing module, which is applied in a scanner. A lens is fixed on the body, and a transmission device is arranged on one side of the body. The transmission device is used to drive the lens for linear displacement to adjust the output. An appropriate scanning focal length can avoid the problem of reducing the depth of field by enlarging the aperture of the lens to increase the scanning speed, and the optical transfer function will not be reduced, so as to achieve the goal of both scanning speed and scanning quality.

Description

Focusing module

Technical field

The utility model is relevant for a kind of Focusing module, is meant a kind of Focusing module that can focus automatically in the scanner of being applied to especially.

Background technology

Scanner can be transformed into digital format with images such as the photograph on real plane, figure, artistic illustrations, and be easy to that computing machine shows, compiles, stores, output etc.Along with the image development of science and technology, scanner has become the some of the indispensable computer system of household or office.

The image of can accurately remaking believes it is most of people one of most important demands when using scanner.Yet, when scanning quality good more, but relatively, high-resolution scanning work, tend to need be longer sweep time.In case will scan heap file, then to expend many times, quite inconvenience concerning the user.

And if will accelerate the sweep velocity of scanner the time in the past, effective method, strengthen the aperture of lens exactly, after but lens stop strengthens, its influence be the minimizing of the depth of field, make in the scanning system as film scanning (film scan), paper feed (Auto Document Feeder automatically, ADF) system, because its scanning position can be different with original correct scanning position, focal length is deviation to some extent, and causes its optical transfer function (Modulation Transfer Function, MTF, below only replace with MTF) decline to a great extent, influence quality of scanning.

Summary of the invention

The purpose of this utility model sweep velocity is provided to provide fast and takes into account quality of scanning.

In order to achieve the above object, the utility model provides a kind of Focusing module, and it is by the position of a gearing mobile lens, adjust the scanning focal length, therefore, when the increase lens stop improves sweep velocity, can't allow optical transfer function descend, and take into account sweep velocity and quality of scanning.

In order to achieve the above object, Focusing module provided by the utility model is applied in the scanner with photosensory assembly, this Focusing module is made of body, the lens and the gearing that are mounted on the body, and the lens that gearing can drive on the body produce linear displacement, with the relative distance between adjustment lens and photosensory assembly, thereby produce the effect of adjusting focal length.

That is to say that the utility model provides a kind of Focusing module, be applied in the one scan instrument that this scanner includes at least one photosensory assembly, this Focusing module includes: a body; One lens are mounted on this body; And a gearing, be connected with this body, produce linear displacement in order to these lens that drive on this body, adjust the relative distance of these lens and this photosensory assembly.

According to design of the present utility model, wherein this body comprises a stationary shaft, by this stationary shaft, this body is installed on this scanner.

According to design of the present utility model, wherein this body comprises a containing groove, in order to be installed with this lens.

According to design of the present utility model, wherein this body also comprises a fixed part, is fixedly arranged on a side of this containing groove, in order to these lens are fixed on this containing groove.

According to design of the present utility model, wherein this fixed part is fixedly arranged on this containing groove one side by a plurality of fixation kits.

According to design of the present utility model, wherein those described fixation kits are the screw thread bond.

According to design of the present utility model, wherein this fixed part is one lamellar and these lens can be clamped on this containing groove.

According to design of the present utility model, wherein this gearing comprises a motor, in order to power to be provided.

According to design of the present utility model, wherein this motor is a linear motor.

According to design of the present utility model, wherein this gearing also comprises a screw rod and a gear set, and this motor combines with this screw rod, and this gear set is located on this body, and this motor is in order to drive this screw rod running and this gear set of interlock.

According to design of the present utility model, wherein this gear set comprises an at least one gear and a tooth bar, and this gear and this tooth bar intermesh to produce the relation of related start.

According to design of the present utility model, wherein this gear and this motor engagement, and this tooth bar is fixed in this body.

According to design of the present utility model, this body also includes a stationary shaft, fixes for this tooth bar.

According to design of the present utility model, wherein this gearing also comprises an eccentric wheel that is incorporated into this motor, and for this body against, the drive by this motor makes this eccentric wheel rotation, this body of interlock produces linear displacement, adjusts the relative distance of these lens and this photosensory assembly.

According to design of the present utility model, wherein this gearing also comprises a belt, transmits the power that this motor provides by this belt, makes to drive this body generation linear displacement.

By Focusing module provided by the utility model, can adjust the focal length of scanning automatically, that is to say, improve sweep velocity even the aperture of lens strengthened, also can not make the depth of field reduce, make MTF to reduce, and can guarantee the quality that scans, and, this Focusing module simple in structure, be easy to make, in the product applicable to business-like scanner.

Description of drawings

Fig. 1 is the combination appearance figure of Focusing module of the present utility model;

Fig. 2 is the exploded perspective view of Focusing module of the present utility model; And

Fig. 3 is the use synoptic diagram of Focusing module of the present utility model.

Wherein, description of reference numerals is as follows:

The 100-body; The 110-containing groove; The 120-fixed part; The 121-fixation kit;

The 122-fixation kit; The 130-stationary shaft; The 200-lens; The 300-gearing;

The 310-motor; The 320-screw rod; The 330-gear set; 331-first gear;

332-second gear; 333-the 3rd gear; The 334-tooth bar; The 400-catoptron;

The 500-catoptron; The 600-photosensory assembly; The 700-light-passing board.

Embodiment

Please refer to Fig. 1 and Fig. 2, the Focusing module of preferred embodiment provided by the utility model mainly includes a body 100, lens 200 and a gearing 300.

This body 100 have a containing groove 110, a fixed part 120, with a stationary shaft 130.Wherein, fixed part 120 is to be locked in containing groove 110 outsides by fixation kit 121,122, wherein this fixation kit 121,122 can for example be the screw thread bond of screw etc., and lens 200 are to be installed in the containing groove 110, as illustrating among the figure, fixed part 120 is lamellar, and lens 200 are clamped and fastened in the containing groove 110, stationary shaft 130 then is positioned at a side of body 100, and the mode that body 100 can movable be pivoted is installed on the scanner.

300 of this gearings are mounted on body 100 outsides, make linear displacement to drive body 100.And in the present embodiment, gearing 300 include a motor 310, a screw rod 320, with a gear set 330.Its gear set 330 is by first gear 331, second gear 332, the 3rd gear 333 of mutually collocation, constituted with a tooth bar 334, wherein, first gear 331 and second gear 332 are to be arranged on the same axle center, and second gear 332, the 3rd gear 333, can do relative motion for being engaged with each other with the groove of tooth bar 334, and tooth bar 334 is to be installed on the stationary shaft of body 100; In addition, motor 310 is to be the axle center with screw rod 320, rotate in order to drive screw 320, and the screw thread of screw rod 320 also is meshed with the groove of first gear 331 and can does relative motion.

Therefore, when 320 runnings of motor 310 drive screws, first gear 331, second gear 332, the 3rd gear 333 of gear set 330 are relatively rotated, and the tooth bar 334 that is fixed on the stationary shaft 130 is moved, and make the lens 200 on the body 100 produce relative displacement along the direction of stationary shaft 130, reach the purpose of adjusting focal length.

And on practice, gearing 300 has numerous embodiments, except the above-mentioned enforcement aspect of utilizing gear set 330, screw rod 320, also can for example rotate, and body is resisted against on the eccentric wheel, when eccentric wheel is subjected to the motor drive by motor driven one eccentric wheel, body be will push against and level or linear displacement longitudinally made, in addition, also can utilize the direct telescopic moving of linear motor or utilize the traction of belt, all can reach identical effect.

For another shown in Figure 3, in the Focusing module provided by the utility model,, also comprise two catoptrons 400,500 in order to arrange in pairs or groups to produce the effect of reflect focalization with lens 200, being received from the light that scanning object reflects, and give reflect focalization to lens 200.

In addition, the utility model more comprises a photosensory assembly 600, this photosensory assembly 600 can be Charged Coupled Device (Charge Couple Device, CCD) or complementary matal-oxide semiconductor (Complementary Metal-Oxide Semiconductor, CMOS), can be in order to being received from the light that lens 200 are reflected, and export after being converted to simulating signal.

Therefore, when scanner carries out scanning operation, can earlier scanning object be placed in a side of the light-passing board 700 of scanner, opposite side at light-passing board 700 provides a light source then, this light source emits beam, its light can pass light-passing board 700 and shine on the scanning object, and the formation reflection ray, reflection ray then can pass light-passing board 700 and penetration mirror 400,500 reflect focalizations to lens 200, lens 200 again with ray cast to photosensory assembly 600,600 of photosensory assemblies can be converted into simulating signal, to export imaging in the computing machine to.

Wherein, when computing machine receive scanner scanning and simulating signal, will cooperate an image analysis software, judge the focal length of scanning, and come the position of mobile lens 200 by CD-ROM drive motor 310, thus adjust best focal length, so can obtain the scanning result of the best.

Therefore, by Focusing module provided by the utility model, can adjust the focal length of scanning automatically, that is to say, improve sweep velocity, also can not make the depth of field reduce, make MTF to reduce even the aperture of lens strengthened, and can guarantee the quality that scans, and, this Focusing module simple in structure, be easy to make, in the product applicable to business-like scanner.

Though this is novel with aforesaid preferred embodiment announcement as above; right its is not novel in order to limit this; anyly be familiar with correlation technique person; in not breaking away from these novel spirit and scope; can do a little change and retouching, therefore this novel scope of patent protection must with claims the person of being defined be as the criterion.

Claims

1. A focusing module, applied in a scanner, the scanner includes at least one photosensitive component, characterized in that the focusing module includes:

a body;

a lens assembled on the body; and

A transmission device is connected with the main body, drives the lens on the main body to generate linear displacement, and adjusts the relative distance between the lens and the photosensitive component.

2. The focusing module as claimed in claim 1, wherein the body comprises a fixed shaft, and the body is mounted on the scanner through the fixed shaft.

3. The focusing module as claimed in claim 1, wherein the body comprises a receiving groove for receiving the lens.

4 . The focusing module as claimed in claim 3 , wherein the body further comprises a fixing part for fixing the lens on the receiving groove, and the fixing part is fixed on one side of the receiving groove.

5 . The focusing module according to claim 4 , wherein the fixing part is fixed on one side of the accommodating groove through a plurality of fixing components.

6. The focusing module according to claim 5, wherein the fixing component is a threaded combination.

7 . The focusing module as claimed in claim 4 , wherein the fixing portion is in the shape of a thin plate, and the lens is clamped to the receiving groove. 7 .

8. The focusing module as claimed in claim 1, wherein the transmission device comprises a motor.

9. The focusing module as claimed in claim 8, wherein the motor is a linear motor.

10. The focusing module according to claim 8, wherein the transmission device further comprises a screw and a gear set, the motor is combined with the screw, the gear set is arranged on the body, and the motor drives the screw Run and link this gear set.

11 . The focusing module according to claim 10 , wherein the gear set comprises at least one gear and a rack, and the gear and the rack mesh with each other.

12. The focusing module as claimed in claim 11, wherein the gear is engaged with the motor, and the rack is fixed on the body.

13. The focusing module as claimed in claim 12, wherein the body further comprises a fixed shaft for fixing the rack.

14. The focusing module according to claim 8, wherein the transmission device further comprises an eccentric wheel combined with the motor and against which the body abuts, the motor drives the eccentric wheel to rotate, and the body generates a linear Displacement to adjust the relative distance between the lens and the photosensitive component.

15. The focusing module as claimed in claim 8, wherein the transmission device further comprises a belt, and the belt transmits the power provided by the motor to drive the body to generate linear displacement.