JPH0194331A - Lens moving device - Google Patents

Abstract

PURPOSE:To reduce an arrangement space to miniaturize a machine body of a copying machine or the like and to reduce the cost by providing first and second long holes and engaging a member, which positions a lens, with the crossing hole part between them and mounting the lens on a first or second moving base. CONSTITUTION:First and second moving bases 60 and 70 are provided which are controlled to be moved back and forth in a first direction and a second different direction respectively while being kept in the overlapped state. A crossing hole part A1 between the first and second long holes 61 and 71 which are provided on the side of the first moving base and that of the second moving base respectively and cross each other is two-dimensionally moved in accordance with the movement control of the first and second moving bases 60 and 70. Consequently, a lens 8 which has a lens positioning member 81 engaged with the crossing hole part A1 and is mounted on the first and second moving bases 60 and 70 is moved to a required X, Y coordinate position on a face parallel with the optical axis in accordance with two-dimensional position movement of the crossing hole part A1. Thus, the lens is moved in a wide range in a small occupied area and an image is moved in a small space.

Description

Detailed Description of the Invention A. Purpose of the Invention [Industrial Application Field] The present invention provides an optical system including an imaging lens (lens barrel), in which the lens is moved to a required position parallel to the optical axis according to conditions. XφY
The present invention relates to a device that converts and moves (shifts) a coordinate position.

[Conventional technology]

For convenience, an image forming apparatus having a variable magnification function will be described as an example.

FIG. 9 is a schematic diagram of an example of an electrophotographic copying machine of moving optical system, rotating drum type, and transfer type having a variable magnification function and a double-sided copying function. 1 is a fixed document placement glass (hereinafter referred to as the document table), and the document 2 is placed on this document table with the image side to be copied facing downward in a so-called one-sided standard, which is easy to operate in the document A position. The document is then set by placing the document pressure bonding plate 3 over it.

In response to the copy start signal, the document illumination lamp 4 and the first movable mirror 5 are moved forward at a predetermined speed V along the lower surface of the document table l from the left side to the right side of the document table l, and the second movable mirror 6 and the first movable mirror 5 are moved forward at a predetermined speed V along the lower surface of the document table l. 3 mirror 7 is moved forward at the speed of repairing V, the downward image surface of the set document 2 on the document table is illuminated and scanned from the left side to the right side, and the illumination scanning light is directed downward. The reflected light from the document surface is reflected by the moving mirror 5#.
6-7→Imaging lens (in this example, a zoom lens barrel) 8→It is rotated in the direction of the arrow at a predetermined circumferential speed through fixed mirrors 9, 10, and 11, and is charged with positive or negative power by a charger 13. Imaging exposure (
As a result, an electrostatic latent image corresponding to the original image is formed on the surface of the drum 12.

The electrostatic latent image is stored in the first developing device 14A or the second developing device 14B.
The toner is developed sequentially, and the developed image is placed between the transfer charger 15 and the drum 1 at the position of the transfer charger 15 (transfer section) from the paper feed section to reduce oblique paper feeding, paper wrinkles, etc. The image is transferred onto a transfer paper P1 or P2 that is synchronously fed based on a so-called central reference.

The transfer paper P or P2 is fed from the first or second paper cassette) 18A-16B.
is edged out for one sheet by the paper feed roller 17A or 17B, and the sheet path 1 is edged by the pull-in roller pair 18A or 18B.
The sheet is drawn into 9A or 19B, rotated with the rotation of the drum 1 by a pair of registration rollers 20, and fed through a sheet path 21 between the drum 1 and the transfer charger 15 on a so-called center basis.

The transfer paper that has undergone the image transfer in the transfer charger 15 is transferred to the separation charger 2.
2, the sheet is sequentially separated from the first surface of the drum, and introduced into the image fixing device 24 by the m-feeding bag 7123, where it undergoes image fixation.
5 and is discharged by a pair of paper discharge rollers 26 to a tray 27 outside the machine as a one-sided copy. After the image has been transferred, the surface of the drum 12 is cleaned by a cleaning device 28 and is repeatedly used for image formation.

The moving members 4 to 7 that have reached a predetermined end point of forward movement in the imaging optical system are turned into backward movement, return to the initial start point of forward movement, and wait.

In the case of double-sided copying, the transfer paper that has been copied on one side after leaving the image fixing device 24 is introduced to the sheet path 30 side by the flapper 29,
The sheet is conveyed again through the sheet path 30 to the pair of registration rollers 20, and fed by the pair of registration rollers 20 to the image transfer section 15 through the sheet path 21, so that the image is transferred to the other side of the transfer paper. As in the case of single-sided copying, separation charger 22→conveying device 23→image fixing device 24
→ Sheet path 25 → Paper discharge roller pair 26, and the sheet is discharged to tray 27 as a double-sided copy.

In the above, the lens 8 of the imaging optical system is controlled to change its position to a required X-Y coordinate position in a horizontal plane parallel to the lens optical axis, and by this movement control, one side is placed on the document table 1. It becomes possible to copy images of originals of various sizes placed on a reference basis to a transfer sheet of a desired size fed to the transfer unit 15 on a center basis at various magnifications designated in advance.

Conventionally, a mechanism as shown in FIG. 1O has generally been adopted as a means for moving the lens 8. FIG. 1θ shows an enlarged plan view of the lens 8 portion of the imaging optical system shown in FIG.

31 is a lens stand, and this lens stand has two parallel guide rods 33 supported in the x-x direction perpendicular to the lens optical axis 〇-〇 between the chassis side plates 32-32 on the front side and the back side.・
A lead screw shaft 34 and a lens stand 31 side are supported by a lead screw shaft 33 so as to be freely slidable along the guide rods, and are rotatably supported by bearings between the side plates 32 and 32 parallel to the guide rods 33 and 33. The female screw members 35 and 35 are screwed together. The screw shaft 34 is connected to the first forward/reverse rotation motor 3
6 through a gear 37φ38, and as the screw shaft 34 is driven to rotate forward and backward, the lens stand 31 is rotated along the guide rods 33 and 33 in the x-x direction perpendicular to the lens optical axis 0-0. It is driven forward and backward.

39 is a Y parallel to the lens optical axis 0-O, with both ends rotatably supported by bearing members 40 on the lens stand 31.
A screw shaft 41 is disposed in the -Y direction, and 41 is a female threaded tube screwed onto the screw shaft.The lens 8, which is integral with this female threaded tube, is firmly attached to a seat and supported.

The screw shaft 39 is connected to the gear 4 by the second forward/reverse motor 42.
3 and 44, and as the screw shaft is driven to rotate forward and backward, the female thread cylinder 41, that is, the lens 8, is driven forward and backward in the Y-Y direction parallel to the lens optical axis 0-0. be done.

Therefore, in relation to the above-mentioned one-sided standard placement of the original, center-based feeding of the transfer paper, original size, selected transfer paper size, selected and specified variable magnification, etc., the first motor 36
The driving of the second motor 42 is controlled by a control system (not shown), so that the first motor 36 drives the lens stand 31 to move in the XX direction, and the second motor 42 drives the female threaded cylinder 41 in the YY direction. By combining the movement drives, the lens 8 is moved to a required X-Y coordinate position on a plane parallel to the optical axis.

45 is a cam plate that engages with the zoom ring of the lens 8 (in this example, the zoom lens barrel); 46 is the lens stand 31;
It is a slanted long groove member fixedly disposed on the top in a non-parallel manner with respect to the optical axis 0-0, and a bottle shaft 47 installed downward on one end side of the cam plate 45 is engaged with the long groove of the groove member 46. It's a combination. As the lens 8 is moved in the Y-Y direction by the drive of the second motor 42, the cam plate 45 is moved in a direction perpendicular to the optical axis O-O due to a change in the engagement position between the bottle shaft 47 and the inclined rim groove member 46. The lens 8 is moved forward and backward by the movement of the cam plate 45.
By controlling the forward and reverse rotation of the zoom ring, focusing is automatically performed when changing the magnification.

[The dark problem that the invention attempts to solve]

(1) In the lens moving means as described above, the lens 8
The movement in the x-x direction is performed by driving the lens stand 31 by the first motor 36, but as mentioned above, there are many other members 39 to 4 in addition to the lens 8 on the lens stand 31.
7 is mounted and arranged, and the total weight of the lens stand 31, which is an object to be moved, is quite heavy. Therefore, a large motor with a large torque is required as the drive motor 36, and the lens stand 3
1 support guide members 33, 33 and power transmission mechanisms 34, 37
・38 etc. also need to be made more robust, which leads to an increase in the overall size and cost of the means mechanism.

(2) Second motor 42 that drives lens 8 in the Y-Y direction
is mounted on the lens stand 31, which is a moving object, and the motor 42 and the power supply/control unit outside the lens stand 31 (
(not shown) is connected with a flexible electrical cord. Seventh, it is necessary to take measures to prevent the electric cord from getting caught in a moving object as the lens stand 31 moves, or from breaking due to repeated bending and stretching.

(3) In recent years, some copying machines have been added with various image editing functions. For example, the so-called image shift function is a function that changes the image at a desired position within the document surface onto the document surface within the transfer paper surface. The copying method is to move (shift) the position to a desired part position that does not correspond to the original position, and to give a specific example, as shown in FIG. For the image portion 2a, the image is transferred to the transfer paper P as shown in FIG. 11(b).
A copy 2b is made with the transfer sheet P shifted to the central position on the upper side, or a copy 2C is made with the transfer sheet P shifted to the central position on the lower side of the transfer paper P as shown in FIG. 11(c).

Image shift 2b as shown in FIG. 11(b) is performed by shifting the timing of feeding the transfer paper to the transfer section, and image shift 2c as shown in FIG. 11(C) is similarly achieved by shifting the timing of feeding the transfer paper to the transfer section. and move lens 8 to
This is done by controlling the movement by a predetermined amount in the -x direction.

] - The amount of movement range of the lens 8 in the x-x direction required to execute the image shift as described above is the same as the amount of movement range required for the lens 8 in the x-x direction when copying a conventional original image placed on one side with reference to the transfer paper surface fed with the center reference. However, it is necessary to ensure a sufficiently large movement range to enable a wide range of image shifting using the conventional lens movement means mentioned above. In this case, the cam plate 33-33 that guides the lens stand 31 in the x-x direction and the lead screw shaft 34 are designed to be quite long, that is, the distance between the chassis side plates 32 and 32 on the front side and the back side of the device is widened. It is necessary to take up a large space during the setting, which results in an increase in the size and cost of the machine such as a copying machine.

The present invention does not have the above-mentioned problems; in other words, it is small in size and requires only a small installation space within a machine such as a copying machine, and therefore the power supply and control system can reduce the size and cost of the machine such as a copying machine. It is highly practical and rational, with the advantages of ensuring electrical safety as there is no movement of electrical cords, and enabling a wide range of image shifting by increasing the movement range of the lens 8 in the X-X direction. The purpose of the present invention is to provide a lens moving device.

Summary: Structure of the Invention [Means for Solving the Problems] The present invention provides for a reciprocating movement of a first direction and a second direction different from the first direction while maintaining an overlapping state with each other. 1 and a second movable base, and the first and second movable bases are provided with first and second elongated holes that intersect with each other, and the position of the lens is set in the intersecting holes. The gist of the present invention is a lens moving device characterized in that a lens is mounted on a first or second moving stage by engaging determining members.

[For production]

The intersecting hole portion of the first and second elongated holes that intersect with the interposers provided on the first and second movable bases is formed in accordance with movement control of the first and second movable bases. It will move in two dimensions. Therefore, the lens mounted on the first or second movable table by engaging the member that determines the position of the lens in the intersecting hole is the first one.
In response to the above-mentioned two-dimensional positional movement of the intersecting hole portion accompanying movement control of the second moving table, the position is converted and moved to a required X and Y coordinate position on a plane parallel to the optical axis.

With this configuration, (1) the lens can be moved over a wide range with a smaller occupied area than the apparatus having the structure of the conventional example (FIG. 9, io), and the image can be moved in a small space.

■ Since the only moving object is the lens, the weight of the moving object can be reduced compared to conventional devices, and a small and inexpensive drive motor is sufficient.

■ Since the moving object does not have a drive device, there is no need for an electric cord directly connected to the moving object for power supply and control, which prevents the electric cord from getting caught in the moving object or from bending and fatigue due to repeated movement. Trouble such as wire breakage can be eliminated.

■ As a driving source for the two directions of movement, two
It is not necessary to use two drive sources, and a design configuration using only one drive motor is possible, which also reduces costs.

(2) By using two or more members to determine the position of the lens, the lens always faces in the direction of the optical axis, and the lens is prevented from tilting with respect to the optical axis when moving the lens.

〔Example〕

Example 1 (Figs. 1 to 5) Fig. 1 is a plan view of the apparatus of this embodiment, and Fig. 2 is an exploded perspective view of the main parts.

Reference numeral 50 denotes a horizontal support board immovably disposed between the chassis side plates 32 and 32 on the front side and back side of the device.

Reference numeral 60 denotes a first movable stage, which is a vertically elongated plate member long in the xx direction perpendicular to the lens optical axis 0-0.

There is a long slit (first elongated hole) 61 in the x-x direction on the board surface.
It is formed. This first movable table 60 is supported with its front end 63 near the chassis side plate on the front side in a direction parallel to the lens optical axis 0-0 [Y 50 is disposed with both ends supported - By supporting the Y-direction guide rod 51 so that it can slide freely along the rod, and having the rear end received on the upper surface of the support @ 50 via the roller 64 attached to the end, the support fi 50 is is disposed so as to be freely movable within the length range of the guide rod 51 in the Y-Y direction while remaining parallel to the top surface of the board.

Reference numerals 52-53 denote a pair of pulleys which are pivotally mounted on the support plate 50 in close proximity to the right and left ends of the Y-Y direction guide rod 51, respectively, and 54 is a suspension tensioner between the two pulleys. The wire is firmly latched 54a to a lug 63a integral with the front end 63 of the first moving platform 60. Then, the pulley 5 is
By rotating the wire 54 in the forward and reverse directions via the wires 2 and 53, the first moving table 60 is driven to move forward and backward in the Y-Y direction on the support plate 50 along the guide rod 51. be done.

70 is a second moving table, which is parallel to the lens optical axis 0-0.
It is a horizontally long plate member long in the X direction, and is located above the first moving table 60, which is long in the XX direction, in a relationship perpendicular to the first moving table 60 in a cross shape. On the plate surface of the second moving table 70, there are two parallel slits (second long holes) 71-71 long in the Y-X direction along both sides of the long side of the plate, and both parallel slits 71.
- An inclined slit (third elongated) 72 is formed between 71 and non-parallel to the Y-X direction. This second movable table 70 is attached to an xx direction guide rod 55 which is disposed with its right end 73 oriented perpendicular to the optical axis 〇-〇 and both ends supported on the support plate 50. Roller 7 is supported so that it can slide freely along the rod, and its left end is attached to that end.
By receiving it on the upper surface of the support plate 50 via 4,
It is disposed on the support plate 50 parallel to the upper surface of the plate and above the first movable table 60 so as to be freely movable within the length range of the guide rod 55 in the XX direction.

Reference numerals 56 and 57 refer to a pair of pulleys which are pivotally connected to the support plate 50L in close proximity to the lower and rear ends of the xx direction guide rod 55, respectively, and 58 is a pair of pulleys suspended between the two pulleys. It is a wire that is stretched around, and the wire is firmly engaged with a lug portion 73a that is integral with the right end portion 73 of the second movable table 70 58a. Then, the pulleys 56 and 5 are driven by a drive mechanism to be described later.
7, the wire 58 is rotated forward/reversely, so that the second movable table 70 moves along the guide rod 55 to the support plate 50.
It is moved forward and backward in the x-x direction above the first moving table 60 while keeping the top parallel to the top surface of the board.

FIGS. 3(A) and 3(B) show the above-mentioned first and second moving tables 6.
The wires 54 and 0-70 are moved forward and backward in the Y-X direction and the x-X direction along the guide rods 51 and 55, respectively.
This is an example of a drive mechanism that rotates 58 forward and backward.

100 is a forward/reverse rotating staping motor fixed on a support plate 50 with a rotating shaft 100a facing upward. 101
102 is a clutch gear that rotates integrally with the rotating shaft 100a of the motor 100, 102 is a first gear provided concentrically with the pulley 52 on the upper surface of the pulley 52 on the right end side around which the wire 54 is wound, and 103 is a first gear A second gear is provided concentrically and integrally with the lower surface of the pulley 56 on the front side around which the wire 58 is suspended, and the second gear 103 is connected to the first gear 102.
positioned higher than.

The clutch gear 101 is located between the first gear 102 and the second gear 103, and can freely slide vertically along the motor rotation shaft 100a, and in the free state, as shown in FIG. 3(A). It is located at the upper m1 position where it is received by the retaining pin 105 at the upper end of the rotating shaft by the pushing up force of the pushing up spring 104 as shown in FIG. In this first position state, the clutch gear lot is disconnected from the first gear 102 and is in mesh with the second gear 103 in correspondence with the second gear 103.

Therefore, in this state, the stepping motor lOO is driven in the forward or reverse direction, so that the forward or reverse driving force is transferred from the rotating shaft 100a+clutch gear 101 to the second
It is transmitted to the pulley 56 via the gear 103, and the wire 58
is rotated forward or backward. That is, the second moving table 7o
is driven forward and backward on the support plate 50 along the guide rod 55 in the XX direction.

lO6 is a connecting cylinder part 107 on the lower side of clutch gear 1ol.
Disk collar seat provided integrally with the clutch gear via the 108
is a clutch lever 51 that freely swings around the support shaft 108a.
09 is a fork portion provided at the tip of the clutch lever and acts on the upper surface of the disk flange 106; 110 is an electromagnetic solenoid plunger mounted and supported by a stationary member (not shown); The tip portion and the rear end portion of the clutch lever 108 are connected.

When the electromagnetic solenoid 1lob is energized, the clutch lever 10B changes from the state shown in Fig. 3(^) to the state shown in Fig. 3(B).
), the disc collar seat 106, that is, the clutch gear 101 is rotated counterclockwise around the support shaft 108a as shown in FIG. It is displaced to a second position that is lowered by a predetermined value than the first position. This second position state is maintained as long as the electromagnetic solenoid 110b is energized. In this second position state, the clutch gear 101 is disconnected from the second gear 103 and is in mesh with the gear 102 corresponding to the first gear lO2.

Therefore, in this state, when the stepping motor 100 is driven in the forward or reverse rotation, the driving force for the forward or reverse rotation is transferred from the rotating shaft 100a to the clutch gear 101 to the first
is transmitted to the boo 952 via the gear 102 and the wire 54
is rotated forward or backward. That is, the first moving table 60
is driven to move forward and backward on the support 5150 along the guide rod 51 in the Y-Y direction.

When the electromagnetic solenoid 110b is de-energized, the pressing force of the fork portion 109 against the disk flange 106 is released, and the clutch gear 101 is pushed up by the push-up spring 104 again to the position shown in FIG. 3(A). Switched to the first position state. In other words, the clutch is switched by turning on and off the power to the electromagnetic solenoid 110b, and the first and second clutches are switched.
One common drive motor 1 for the moving table 60φ70
00, the movement is selectively driven.

In this way, the first and second movable tables 60 and 70 maintain a cross-shaped orthogonal relationship with each other, and each moves along the Y axis parallel to the lens optical axis 〇-〇.
- By being controlled to move in the x-x direction perpendicular to the Y direction, the first long hole 61 on the first moving table 60 side and the second long hole of two parallel strips on the second moving table 70 side Holes 71, 71 and 3rd
Each intersecting hole portion A+ @AI @ consists of the elongated hole 72
A2 (Fig. 1) has both the first and second moving tables 60 and 70.
With the movement control, the two-dimensional position is moved with respect to the upper surface of the support gi 50, that is, with respect to a plane parallel to the lens optical axis O-0.

As shown in the second figure, the lens 8 is provided with circumferential protrusions 80 at the four corners of the lower surface of the lens barrel, and two lens positioning members that are fitted into the intersecting holes A and -A, respectively. It is equipped with downward-facing book bins 81. Reference numeral 83 denotes a zooming cam plate provided on the lower surface of the lens barrel, and the lens 8 is moved x-x by the guiding action of the elongated holes 83a, 83a of the cam plate and the bins 81, 81 projected from the elongated holes. It is free to slide in any direction. Further, zoom lens bins 84, 84 are engaged with the doglegged cam elongated holes 83b-83b of the cam plate, respectively. When the cam plate 83 is slid in the x-x direction with respect to the lens 8, the zoom lens bins 84φ84 are moved in the direction toward or away from each other through the doglegged cam elongated holes 83b and 83b. A zooming operation is performed. Also cam plate 83
A downward pin 82 for moving the cam plate is provided on the lower surface of the cam plate and is fitted into the intersecting hole A2.

The lens 8 has the three bottles 81, 81-82 projecting downwardly on the lower surface thereof fitted into the three intersecting holes A1, A and A2, respectively. [
MC @ featured) Sase.

With the above configuration, when the first movable base 60 is driven forward or backward in the Y-Y direction, the lens 8 slides on the second movable base 70 in its longitudinal direction, that is, the first The moving table 60 is moved forward or backward in the Y-Y direction, which is the same direction as the moving direction of the moving table 60. Further, when the second movable table 70 is driven forward or backward in the xx direction, the lens 8 accordingly moves forward or backward in the xx direction together with the second movable table 70 on which it is mounted. Moving. Therefore, by controlling the movement of the first moving table 60 and the second moving table 70 in the Y-Y direction and the x-x direction, the lens 8
moves in two dimensions with respect to the support l1150 plane, that is, with respect to a plane parallel to the optical axis 0-0. When moving this lens, the first elongated hole 61 on the first moving table 60 side,
Two parallel second elongated holes 71 and 71 on the second moving table 70 side
Since the positioning pins 81-81 on the lens 8 side are fitted into the two intersecting holes A and -A1, the optical axis of the lens 8 is always aligned in the predetermined optical axis 0-O direction ( Y
- a direction parallel to the Y direction) and moves, and does not tilt with respect to the predetermined optical axis 0-0 direction.

During variable-magnification copying, the 'it magnetic solenoid 110b (Fig. 3) is energized, the clutch gear 101 is held in mesh with the first gear 102 as shown in Fig. 3(B), and the motor 100 is As described above, the first moving table 60 rotates between the pulleys 52 and 53 and the wire 54 through forward or reverse rotation control.
By moving the lens 8 forward or backward in the Y-Y direction parallel to the optical axis 0-O along the guide rod 51 by the mechanism, the lens 8 is moved according to the desired magnification on the second moving table 70. It is moved to a position in the Y-Y direction. Also, in conjunction with the movement of this lens 8 in the Y-Y direction, the first elongated hole 61 on the first moving table 60 side is opened.
The zooming cam plate 8 of the lens 8 is inserted into the intersecting hole A2 formed by the third long hole 72, which is an inclined slit on the second movable table 70 side
3 is moved forward or night shift in the xx direction with respect to the lens 8. As the cam plate 83 moves, the zoom lens pins 84 and 84 of the lens 8 are removed by the dogleg-shaped cam elongated holes 83b and 83.
The lenses 8 are moved toward or away from each other at step b, and the lenses 8 are zoomed in accordance with a desired magnification ratio.

In case of the above-mentioned image shift etc., electromagnetic solenoid 1
The power to the lob is cut off and the clutch gear lot is
As shown in FIG. 3 (A), the second gear 103 is held in mesh with the second gear 103, and the second
As described above, the lens 8 is moved forward or backward along the re-guide rod 55 in the X-X direction perpendicular to the optical axis O-O by the mechanism of the pulleys 56 and 57 and the wire 58. is moved by the second moving stage 70 to a position in the xx direction corresponding to a desired image shift ψ, etc.

FIG. 4 is a schematic optical relationship diagram of the document table 1, lens 8, and photosensitive member 12 (the developing surface of the photosensitive drum) of the copying machine shown in FIG. In order to shift the image, the width L on the original platen 1 is
In order to focus the image of the object in O on the surface of the photoreceptor 12 at an arbitrary position in Lc, the lens 8 focuses the image of the original 2 placed on the original table l with one side reference (la is a one side reference ruler member). Photoreceptor 12
For the surface, the amount of movement X (8
-8) Although a larger amount of movement x' (a - a'') is required, the lens moving device of the present invention can be constructed with a size that is approximately half the width of the movable lens stand 31 larger than X'. Therefore, it is possible to significantly reduce the size of the device compared to the conventional device as shown in FIG. 1θ.

Generally, as shown in FIG. 5, if the center of the width fLa is located at a distance X# from the center 0 on the document table l, the center of the radius 1a is located at a distance X' from the center 0 on the photoreceptor 12. When forming an image in a certain way, the lens 8 is at the same magnification and from position 8 without image movement.

sentence) (==(mx+X)□ 1+m shi-(tH) ÷ It will move to position 8.

The amount of movement 1x*ly of the lens 8 is the sensor S shown in FIG.
The device control unit (not shown) controls the number of pulses of the stepping motor 100 from the position where the moving tables 70 and 60 reach x*Sy.
By counting the distances, the apparatus control unit can know the moving distance of each of the movable tables 70 and 60. Either of the first and second moving tables 60 and 70 for moving the lens 8 to the desired x-y coordinate position may be moved first, or only one of them may be moved as necessary. .

Example 2 (Fig. 697) Fig. 6 is a plan view of the apparatus of this example, and the same reference numerals are given to the same constituent members and parts as those of the above-mentioned Example 1, and the explanation thereof will be omitted.

This example device can move the first and second movable tables 60 and 70 at once.
Instead of the tension wire mechanism of Example 1, this is done using rotary feed screws 51A and 55A disposed on the support 950 in the Y-Y direction and the XX direction, respectively.

The front end 63 of the first movable table 60 is a female threaded cylinder and is screwed into the YY direction feed screw rod 51A. The right end portion 73 of the second moving table 70 is also a female threaded cylinder.
- It is screwed into the X direction screw rod 51A. 52A-56A
is a bevel gear fixed to the right end of the Y-Y direction feed screw rod 51A and the front end of the X-X direction screw rod 55A, respectively;
100A is a driving bevel gear rotated by a forward/reverse motor (not shown), which is disposed between the two full gears 52A and 56A. Figure 7 (A) shows these three bevel gears 52Aψ56A.
- Shows an enlarged view of the 100A portion. Drive bevel gear 1
Although not shown in the figure, 00A is oscillated to selectively mesh with bevel gears 52A and 56A by a clutch means including an electromagnetic solenoid or the like. By switching to the bevel gear 52A side, the forward or reverse driving force of the driving bevel gear 100A is applied to the Y-Y direction feed screw rod 51 via the bevel gear 52A.
A, the threaded rod is driven forward or backward, and the first
The moving table 60 is moved forward or backward in the Y-Y direction.

Also, by switching to the other bevel gear 56A side, x-
The x-direction feed screw rod 55A is driven in the forward or reverse direction to
The moving table 70 is moved forward or backward in the xx direction.

The left end of the second moving platform 70 is provided with a rail strip 74B in the xx direction on the support plate 50 instead of the two lowers 4 in Example 1,
A slider 74A integrated with the left end of the movable table 70 is mounted on the rail strip 74B to receive the slider 74A.

The board surface of the first moving table 60 has an x
- Two parallel slits long in the x direction (first long hole) 61
・61 is provided, and the first elongated holes 61, 61 with two parallel stripes on the first moving table 60 side, and the second elongated holes 71 with two parallel stripes on the second moving table 70 side. Four lens positioning pins 81 correspondingly provided on the lower surface side of the lens 8 are fitted into the four intersecting holes 18ffi A and 71, respectively.

The zooming of the lens 8 is carried out by the cam plate 83 being engaged with the pin 82 on the cam plate side in the intersecting hole A2 in the same manner as in Example 1, so that the first movable table 60 can be moved in the Y-Y direction. This is done by moving in the xx direction with respect to the lens 8 in conjunction with each other, but in this example, rack teeth 83c in the xx direction are provided on the upper surface side of the cam plate 83, and the rack 6
1iI83C, zoom ring 85 (first (
B) In the lens 8 of this example, pinion teeth 86 provided on the outer periphery of a cylindrical lens barrel are engaged with each other, and when the cam plate 83 moves in the xx direction, the zoom ring 85 engages with the outer periphery of the lens 8. In conjunction with this, the zoom lens bins 87 are moved toward or away from each other, and the lens 8 is zoomed in accordance with a desired magnification ratio.

Example 3 (FIG. 8) The figure is a plan view of the device of this example, and the same reference numerals are given to the same constituent members and parts as those of Example 1, and the explanation thereof will be omitted.

In the device of this example, the movement of the first moving table 60 is carried out by the same tension wire mechanism as in Example 1, and the movement of the second moving table 70 is carried out by the same rotating feed screw mechanism as in Example 2. It is.

Ml is a drive motor of the tension wire mechanism, and a gear Gl which is driven in forward and reverse directions by this motor and a gear G2 integrated with one pulley 52 on which a tension wire 54 is stretched are meshed.

M2 is a motor that drives the feed screw rod 55A in the forward and reverse directions, and the rotation shaft and the end of the feed screw rod 55A are connected to the joint 5.
It is connected via 5B.

The second elongated hole 71 provided on the plate surface of the second moving table 70 is only one in the case of the device of this example, compared to the two parallel strips in Example 1, and the second elongated hole 71 and the first One positioning pin 81 provided on the lens 8 is fitted into one intersecting hole A formed by the first elongated hole 61 on the movable table 60 side.

Even if only one lens positioning bin 81t is used, the lens 8 can be moved without any problem by separately providing another tilt prevention bin 88 to prevent the lens 8 from tilting with respect to the predetermined optical axis 0-O direction during the movement process. will be moved. The lens tilt prevention member does not have to be a bottle, but a lens guide rail etc.
Alternatively, a configuration may be adopted in which the second moving table is provided to prevent the lens from tilting.

Example 1 of the moving drive means for the first and second moving tables 60 and 70
Of course, mechanisms other than the pull wire mechanism and the feed screw rod mechanism as shown in 3 to 3 can be used.

Further, the moving directions of the first and second movable tables do not need to be orthogonal to each other.

C1 Effects of the Invention As described above, the lens moving device of the present invention is small in itself and requires less space for installation inside a machine such as a copying machine, and therefore can reduce the size and cost of the machine such as a copying machine. , there is no need to move electrical cords for power supply and control, ensuring electrical safety, and the lens has a large range of movement in the image shift direction (X-X direction), making it possible to shift images over a wide range. With this, the intended purpose is well achieved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the device of the first embodiment, Fig. 2 is an exploded perspective view of its main parts, Figs. Fig. 5 is a schematic optical relationship diagram of the document table, lens, and photoreceptor; Fig. 6 is a plan view of the second embodiment; Fig. 7 (A) is an enlarged plan view of the moving table drive mechanism. Figure 7 (B) is a perspective view of the lens barrel, Figure 8
9 is a schematic diagram of the configuration of an example of a copying machine, FIG. 1O is a plan view of an example of a conventional lens moving device, and FIGS. 11(a), (b)-( c) is an explanatory diagram of an example of image shift. 60-70 are the first and second moving tables, 61 and 71 are 0'
S1 and the second elongated hole, A is an intersecting hole formed by both of the elongated holes, 81 is a lens positioning pin fitted into the intersecting hole, and 8 is a lens (lens barrel).

Claims (1)

[Claims] 1. A first and a second movable platform are provided which are controlled to reciprocate in a first direction and a second direction different from the first direction while maintaining an overlapping state; The first and second moving table sides are provided with first and second elongated holes that intersect with each other, and a member for determining the position of the lens is engaged with the intersecting hole portion, so that the lens can be moved to the first or second moving table side. A lens moving device, characterized in that it is mounted on a second moving table. 2. The lens moving device according to claim 1, wherein the moving stage is provided with a member that holds the lens so that it does not tilt from the optical axis.