KR100267245B1 - Apparatus for adjustment lens position in shuttle type scanner - Google Patents

Abstract

PURPOSE: A device for controlling a lens position in a shuttle method scanner is provided to improve a precision, and to control a focus quickly by forming a deceleration implement structure at a cap lens and by controlling a transfer state of a lens holder finely. CONSTITUTION: A filter(2) is assembled at a lens assembly(7) after inserting the filter(2) into a lens holder(4). An electric charge coupling element board(8) is fastened at a frame(6). After a spring is inserted into an outside of the lens holder(4), the inserted spring is coupled with a coupling part(12) of the frame(6), and a cap lens(13) is coupled with the coupling part(12) by rotating the cap lens(13). After a coupled thing including the coupled the lens assembly(7) and an electric charge coupling element assembly(10) is coupled with a frame base(14). In this state, a spring clip(16) is inserted into a clip groove(15), and one side of a screw(18) is inserted into a penetration hole(20), and other side of the screw(18) is inserted into a coupling groove(22). A lamp board(25) is inserted into a reflecting mirror(24). After a lamp(27) is inserted into a penetration hole(26) of the reflecting mirror(24), a lamp assembly(28) is assembled. After this, the lamp assembly(28) is inserted into a bottom side of a cover lower(29).

Description

Apparatus for adjustment lens position in shuttle type scanner}

The present invention relates to a reduction optical system of a shuttle scanner, and more particularly, it is possible to finely adjust the position of the lens assembly mounted on the shuttle scanner, thereby accurately adjusting the focus and magnification of the image formed on the charge coupling device. It relates to a lens position adjusting device of a shuttle scanner.

In general, a shuttle scanner is a device that scans an image recorded on an original while reciprocating left and right in the direction orthogonal to the document's conveying direction. A lamp assembly including a lamp for scanning light onto a surface), a lens assembly including a lens for collecting reflected light reflected from an original, and a charge coupled device (CCD) for converting the reflected light collected by the lens into an electrical signal. A charge coupled device assembly including a charge coupled device). In addition, the lens assembly 1 is composed of a filter 2, a lens 3 and a lens holder 4, as shown in Figure 1, the lens holder 4 between the charge coupling element assembly and the lamp assembly It has a flowable structure. In addition, the lens assembly and the charge coupling device assembly have a structure that can be integrated and rotated.

The lens assembly 4 is a device for condensing the reflected light emitted from the lamp assembly and reflected from the data recording surface of the original to form an image in the charge coupling device, focusing the scanning area Y of the original 5 on the charge coupling device. In order to obtain an image Y 'adjusted to an arbitrary magnification by focusing (image forming), the position of the lens 3 must be finely adjusted so as to satisfy the focus formula as shown in Equation 1 below.

는 원고로부터 렌즈까지의 거리이고,

는 렌즈로부터 전하결합소자까지의 거리이며,

는 초점거리이다. 그리고,

는 배율을 나타낸다.here,

Is the distance from the original to the lens,

Is the distance from the lens to the charge-coupled device,

Is the focal length. And,

Represents the magnification.

The conventional scanner combines the lens holder 4 into which the filter 2 and the lens 3 are inserted into the frame 6 of the charge coupling device assembly, and then moves the lens holder 4 back and forth in the frame 6. In FIG. 2, the focus was adjusted while moving finely in the 'A' direction. Subsequently, when the focus adjustment is completed, the lens holder 4 and the frame 6 are bonded to each other, thereby preventing the flow of the lens holder 4.

By the way, such a conventional focusing operation causes the following problems.

(1) When adjusting the focus while moving the lens holder in the 'A' direction within the frame, since there is no other means for slowing down the movement of the lens holder, the precision of fine adjustment is low.

(2) In the case of adjusting the focus using a separate adjusting jig, it takes a considerable time to install and adjust the lens assembly to the jig, thereby reducing productivity.

Accordingly, an object of the present invention is to solve such problems, and an object of the present invention is to form a deceleration mechanism structure in a cap lens separate from a frame to finely adjust the conveying state of the lens holder, thereby improving accuracy and quickly focusing. It is to provide a lens position adjusting device of a shuttle scanner that can be adjusted.

1 is an exploded perspective view showing a conventional lens assembly,

2 is a view illustrating a focus adjustment state by a conventional lens assembly;

3 is an exploded perspective view of a scanner module according to the present invention;

4 is an exploded perspective view of the lens assembly shown in FIG. 3;

5 is a front sectional view of FIG. 4;

6A and 6B are conceptual views for obtaining the inclination of the engaging groove that satisfies the self-locking condition.

<Description of the code | symbol about the principal part of drawing>

1: lens assembly 2: lens

3: filter 4: lens holder

6: frame 11: spring

12: Joining portion of frame 13: Cap lens

33: step 34: coupling groove

35: turning

A first feature of the present invention for achieving the above object is that the lens holder is intrinsic, and includes a conveying means for reciprocating the lens holder in the frame, and an adhesive member for closely contacting the lens holder to the conveying means. .

In the first aspect of the present invention, the contact member is preferably a spring interposed between the lens holder and the frame.

In addition, the conveying means includes a cap lens formed with a projection on its inner surface and a coupling groove processed on the outer surface of the frame, and as the cap lens rotates, the projection is transferred along the coupling groove so that the distance between the lens and the charge coupling element is variable. do.

In particular, the coupling groove is machined at an inclination angle that satisfies the condition of the inclination angle <tan ^-1 (friction coefficient).

On the other hand, a second aspect of the present invention is a lens holder having a frame in which a charge coupling element is built, a lens coupled within the frame and focusing an image of an original on the charge coupling element, and rotation of the lens holder as the lens holder is rotated. And converting means for converting the motion into a linear motion to reciprocally convey the lens holder in the frame.

In the second aspect of the invention, the conversion means includes a projection formed on the inner surface of the frame and the coupling groove processed on the outer surface of the lens holder, the projection is transferred along the coupling groove as the lens holder rotates the lens and the charge coupling device It can also be configured to vary the separation interval of.

In addition, the converting means includes a female screw processed on the inner surface of the frame and a male screw processed on the outer surface of the frame, and configured to vary the separation distance between the lens and the charge coupling device as the lens holder rotates while the male screw and the female screw are engaged. You may.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description there are shown a number of specific details, such as components of the specific circuit, which are provided only to help a more general understanding of the present invention that the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a perspective view of the shuttle scanner module applied to the present invention, Figure 4 is an exploded perspective view of the main portion of FIG.

Briefly explaining the assembly process of the shuttle scanner module shown in Figures 3 and 4 as follows.

After inserting the filter (2) in the lens holder (4) and then fitted by fitting the lens (3) and fixed them in a heat fusion method assembled to the lens assembly (7). In addition, the charge coupling device board 8 is fastened to the frame 6 by the fastening member 9 to assemble the charge coupling device assembly 10, and then the spring 11 is inserted into the outside of the lens holder 4. Of the charge coupling device assembly 10 is coupled to the coupling portion 12 of the frame 6 and the cap lens 13 is rotated against the coupling portion 12 of the frame 6 to fix the coupling.

After the combination of the lens assembly 7 and the charge coupling device assembly 10 coupled through the above process to the frame base 14, the clip groove 15 formed in the coupling portion 12 of the frame 6 Fit the spring clip 16, one side of the screw 18 of the knob adjustment device 17 is in the through hole 20 formed in the support 19 of any one of the left and right support of the frame base 14 The other side of the screw 18 of the knob adjustment device 17 is fitted to the fitting coupling to the coupling groove 22 formed in the other support 21 of the frame base 14. Here, the stepped groove 23 having an inner diameter smaller than the outer diameter of the screw 18 is formed in the coupling groove 22 to prevent the screw 18 fitted to the coupling groove 22 is separated from the outside.

Meanwhile, the lamp board 25 is inserted into the reflector 24, and at least one lamp 27 is inserted into the through hole 26 of the reflector 24 and soldered to assemble the lamp assembly 28. Then, the assembled lamp assembly 28 is fitted to the bottom of the cover lower 29, and the frame base 14 assembly (lens assembly 7 and the charge coupling device assembly 10) is assembled into the lamp assembly. It is coupled to the upper end of the 28 and fastened to the fastening member 30.

When the assembly process is completed, the tilt deviation correction operation of the scanner module is performed. Then, the cover upper (Cover Upper) 31 is coupled to the cover lower 29, and the label 32 is attached to the predetermined position. Is complete.

On the other hand, referring to Figure 5 will be described in more detail the structure of the lens position adjustment device applied to the present invention.

Steps 33 are formed at one side of the lens holder 4 illustrated in FIGS. 3 and 4, and a spring 11 fitted to an outer surface of the lens holder 4 is supported by the step 33. In addition, as shown in FIG. 5, coupling grooves 34 and protrusions 35 are respectively machined on the outer surface of the coupling portion 12 and the inner surface of the cap lens 13 of the frame 6 to engage the coupling groove 34. As the cap lens 13 is rotated while the protrusion 35 is engaged, the cap lens 13 is fastened and fixed to the engaging portion 12 of the frame 6.

That is, the lens assembly 1, in which the lens holder 4, the lens 3, and the filter 2 are fusion-bonded, is installed to be slidable in the frame 6, and the spring 11 is a lens holder ( 4) and the frame 6 are interposed such that the lens holder 4 is in close contact with the cap lens 13. In addition, a scale of a predetermined form is displayed on the outer surface of the cap lens 13 so that the user can recognize the moving distance of the lens corresponding to the amount of rotation of the cap lens 13.

In particular, when the cap lens 13 is rotated in the direction 'B' of FIG. 4, the projection 35 processed on the inner surface of the cap lens 13 is coupled to the coupling groove 34 processed on the outer surface of the frame 6. Therefore, the lens holder 4 is decelerated in the 'C' direction. At this time, when the cap lens 13 is rotated once, the lens holder 4 is transferred by the reference pitch amount, and assuming that the reference pitch amount is 2 mm, the lens holder is rotated by 360 °. 4) is transferred by 2 mm, and the cap lens 13 may be rotated by 90 ° according to Equation 2 below to advance the feeding distance of the lens holder 4 by 0.5 mm.

)은 프레임(6)에 가공된 결합홈(34)의 미끄럼 면에 수직한 법선력(

)과, 경사면방향으로 유동 및 이탈하려는 힘(미끄럼작용력,

)으로 분리된다. 여기서, 결합홈(34)과 돌기(35)에 의한 마찰계수를

, 마찰력을

라고 가정하면, 셀프-락킹조건은 다음의 수학식 3의 조건을 만족하여야 한다.On the other hand, when the reference pitch amount of the lens holder 4 is determined by one rotation of the cap lens 13, the spring 11 can be used even when there is no external force by using the mutual relation for each action force shown in FIGS. 6A and 6B. Due to the repulsive force of the cap lens 13 can be processed into a self-locking (Self-Locking) structure to prevent the flow or escape from the frame (6). In more detail, the force acting in the axial direction (the 'X' direction of FIG. 2) by the spring 11 (repulsive force,

) Is the normal force perpendicular to the sliding surface of the coupling groove 34 processed in the frame (6)

) And force to flow and escape in the direction of the slope (sliding force,

Separated by). Here, the coefficient of friction by the coupling groove 34 and the projection 35

Friction

, The self-locking condition must satisfy the condition of the following equation (3).

Substituting Equation 4 below into this formula, the result is shown in Equation 5.

)와 결합홈(34) 및 돌기(35)의 경사각도(

)를 설정하면 캡 렌즈(13)를 회전시켜 임의의 위치에서 포커스를 일치시킨 후 별도의 조치를 취하지 않더라도 락킹효과를 얻을 수 있다.Therefore, the friction coefficient satisfying the above equation (5) (

) And the inclination angle of the coupling groove 34 and the projection 35 (

Is set, the cap lens 13 can be rotated to match the focus at an arbitrary position, and the locking effect can be obtained without any further action.

In addition, by displaying a predetermined scale on the outer surface of the cap lens 13, the user can easily determine the conveying distance of the lens holder 4 corresponding to the amount of rotation of the cap lens 13. For example, assuming that the lens holder 4 moves 2 mm when the cap lens 13 is rotated once, and there are 8 scales machined on the cap lens 13, the cap lens 13 is rotated by one scale. The lens holder 4 is moved by 0.25 mm. Therefore, the moving distance of the lens holder 4 can be adjusted more accurately.

On the other hand, although not shown, the coupling structure of the cap lens 13 and the frame 6 presented in the embodiment of the present invention may be modified in the following three cases.

(1) A female screw is machined on the inner surface of the cap lens 13, and a male screw is machined on the outer surface of the engaging portion 12 of the frame 6 and joined by respective screws, and the lens holder 4 is engaged by the spring 11. The lens holder 4 is reciprocated left and right in the frame 6 as the cap lens 13 is rotated in the state in which the cap lens 13 is in close contact with the cap lens 13.

(2) A male screw is machined on the outer surface of the lens holder 4, and a female screw is machined on the inner surface of the engaging portion 12 of the frame 6, and is coupled by respective screws. As the lens holder 4 is rotated, the lens The structure in which the focus of (3) is adjusted.

(3) process the engaging groove on the outer surface of the lens holder (4), and process the projection on the inner surface of the engaging portion 12 of the frame (6) is coupled by the projection and the coupling groove, as the lens holder (4) rotates The structure in which the focus of the lens 3 is adjusted.

Therefore, the focus state of the lens can be easily adjusted by the above-described respective coupling structures.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

As a result, according to the lens position adjusting apparatus of the shuttle scanner according to the present invention, there are advantages as follows.

(1) Fine adjustment of the lens position is possible without the need for a separate adjustment jig, enabling precise focus adjustment.

(2) By adjusting the position of the lens by fastening the cap lens to the frame, the productivity of the optical module is improved, and the quality can be stabilized by precise focus adjustment.

Claims (5)

A shuttle scanner comprising: a lens holder having a frame in which a charge coupling element is embedded, and a lens holder interposed in the frame and focusing an image of an original on the charge coupling element; A cap lens in which the lens holder is installed, and a protrusion formed on an inner surface thereof to reciprocate the lens holder in the frame; And An adhesion member for bringing the lens holder into close contact with the transfer means; As the cap lens rotates, the protrusion is moved along the coupling groove while being engaged with the coupling groove processed on the outer surface of the frame to vary the separation distance between the lens and the charge coupling device; The coupling groove

The lens position adjustment device of the shuttle scanner characterized in that the lens holder is fixed by being processed to the inclination angle that satisfies the condition of. The method of claim 1, wherein the contact member, Lens position adjusting device of the shuttle scanner characterized in that the spring interposed between the lens holder and the frame. The method of claim 1, wherein the cap lens, And a transmission member for transmitting the reflected light so that the reflected light reflected from the document reaches the lens. The method of claim 1, wherein the cap lens, And a scale divided at equal intervals on a front surface thereof so that an operator can identify the movement amount of the lens holder corresponding to the rotation amount of the cap lens. A frame in which a charge coupling device is formed, and a protrusion formed on an inner surface thereof; And A coupling groove having a shape corresponding to the protrusion on the outer surface thereof, the lens holder having a lens coupled to the frame and focusing the image of the document on the charge coupling element; The projection is moved along the coupling groove as the lens holder is rotated while the protrusion is engaged with the coupling groove so that a distance between the lens and the charge coupling device is varied; The coupling groove

The lens position adjustment device of the shuttle scanner characterized in that the lens holder is fixed by being processed to the inclination angle that satisfies the condition of.

Images