JPH10153826A - Variable magnification optical device for copying machine and assembling adjusting jig for movable mirror unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform the high accurate adjustment of squareness between a shaft line in a longitudinal direction and an optical axis by controlling the shaft line in the longitudinal direction along the reflection surface of a movable mirror unit so as to extend the shaft line at a right angle with respect to the optical axis of a movable lens unit. SOLUTION: The arrangement interval of a pair of positioning projection elements 80 and 81 is the same as that of the perpendicular supporting boards 45 and 46 of the movable mirror unit 41. Besides, when the unit 41 moves to an original point position, the respective trailing end parts 45a and 46a of the boards 45 and 46 abut on the elements 81 and 81. In such an abutting condition, the shaft line in the longitudinal direction along the third reflection mirror 16 and the reflection surface of the fourth reflection mirror is at a right angle with the optical axis of the image formation lens 15 of the unit 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable power optical device incorporated in a copying machine, and more particularly to a variable power optical device having a movable lens unit and a movable mirror unit for changing the magnification of a copied image mounted on a chassis. The present invention also relates to an assembling adjustment jig used for assembling the movable mirror unit to such a variable power optical device.

[0002]

2. Description of the Related Art A variable magnification optical apparatus of a copying machine includes a movable lens unit and a plurality of mirror units. The plurality of mirror units include both a movable mirror unit and a fixed mirror unit. The main part of such a variable power optical device is modularized and sold as an independent product, and is incorporated into a copying machine by a copying machine maker or the like. In this case, in a modularized variable power optical device, the movable lens unit and at least one movable mirror unit are mounted on a common chassis.

[0003]

The movable lens unit and the movable mirror unit are moved with respect to the chassis in a predetermined relative positional relationship, thereby changing the copy magnification of the copy image. The relative movement of the movable lens unit and the movable mirror unit is performed along the optical axis defined by the movable lens unit. In this case, in order to obtain a copy image without distortion, the longitudinal axis along the reflection surface of the movable mirror unit is Must be maintained perpendicular to the optical axis. Therefore, in the assembling process of the variable power optical device, skill is required particularly in adjusting the perpendicularity between the longitudinal axis along the reflecting surface of the movable mirror unit and the optical axis of the movable lens unit with high accuracy. It was troublesome work.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a variable magnification optical apparatus in which a movable lens unit and a movable mirror unit for changing the magnification of a copied image are mounted on a chassis, and a longitudinal section along a reflecting surface of the movable mirror unit. It is an object of the present invention to provide a variable power optical device capable of easily performing a high-precision adjustment of a squareness between a direction axis and an optical axis of a movable lens unit.

Another object of the present invention is to provide a variable-magnification optical device incorporated in a copying machine in which at least a movable mirror unit and a movable lens unit are mounted on a chassis for changing the magnification of a copied image. An assembly adjustment jig used for assembling the movable mirror unit to the variable magnification optical device, wherein a straight line between the longitudinal axis along the reflection surface of the movable mirror unit and the optical axis of the movable lens unit is provided. An object of the present invention is to provide an assembling adjustment jig capable of easily performing high-precision adjustment of an angle.

[0006]

A variable magnification optical apparatus according to a first aspect of the present invention is incorporated in a copying machine.
A movable lens unit and a movable mirror unit for changing the magnification of a copy image are mounted on a chassis. According to the present invention, the movable mirror unit abuts on a pair of positioning projection elements provided on the chassis at a predetermined position, and the longitudinal axis along the reflecting surface of the movable mirror unit is aligned with the optical axis of the movable lens unit. It is characterized in that it is regulated so as to extend at a right angle.

In the variable magnification optical apparatus according to the first aspect of the present invention, the predetermined position at which the movable mirror unit is brought into contact with the pair of positioning projection elements is preferably the origin position of the movable mirror unit. .

Further, in the variable power optical apparatus according to the first aspect of the present invention, preferably, at least one of the pair of positioning projection elements is configured so as to be able to finely adjust the projection length thereof. An example of the positioning projection element is a movable pin of a micrometer. According to such a configuration, the work of attaching the pair of positioning projection elements to the chassis becomes easy, and the manufacturing cost of the variable magnification optical device can be reduced.

Further, in the variable magnification optical apparatus according to the first aspect of the present invention, when at least one of the pair of positioning projection elements is configured to be able to finely adjust the length of the projection, such fine adjustment is performed. Is performed such that a straight line connecting the tips of the pair of positioning projection elements is perpendicular to the optical axis of the movable lens unit. At this time, a straight line connecting a pair of mounting holes formed in the chassis to be fixed to the machine frame of the copying machine is made to be perpendicular to the optical axis of the movable imaging unit, and the tips of the pair of positioning projection elements are It is preferable to perform the above-described fine adjustment so that the connecting straight line is parallel to the straight line between the pair of mounting holes.

An assembly adjusting jig according to a second aspect of the present invention comprises a variable power optical device incorporated in a copying machine having at least a movable mirror unit and a movable lens unit mounted on a chassis in order to change the magnification of a copied image. When configured as such, it is used for assembling the movable mirror unit with respect to the variable power optical device, and includes a flat portion on which the variable power optical device is mounted, and a predetermined portion from the flat portion. Comprising a pair of positioning elements provided at the height position, the movable mirror unit of the variable power optical device mounted on the flat portion abuts on the pair of positioning projection elements at its origin position,
The movable mirror unit is characterized in that a longitudinal axis along a reflection surface of the movable mirror unit is regulated so as to extend at right angles to an optical axis of the movable lens unit. The pair of positioning projection elements are preferably mounted on upright side walls that stand upright from the flats.

In the assembly adjusting jig according to the second aspect of the present invention, the predetermined position at which the movable mirror unit is brought into contact with the pair of positioning projection elements is preferably set to the origin position of the movable mirror unit.

Also, in the assembling adjusting jig according to the second aspect of the present invention, preferably, at least one of the pair of positioning projecting elements is configured so as to be able to finely adjust the protruding length, and such a positioning is performed. Examples of the protruding element include a movable pin of a micrometer. According to such a configuration, the work of attaching the pair of positioning projection elements to the chassis becomes easy, and the manufacturing cost of the variable magnification optical device can be reduced.

Further, in the assembling adjustment jig according to the second aspect of the present invention, when at least one of the pair of positioning projection elements is configured so as to be able to finely adjust the protruding length, such fine adjustment is not performed. This is performed so that a straight line connecting the tips of the pair of positioning projection elements is perpendicular to the optical axis of the movable lens unit.

Further, in the assembling adjustment jig according to the second aspect of the present invention, preferably, the chassis has a pair of mounting holes formed in the chassis so as to be fixed to the frame of the copying machine. The straight line connecting the pair of mounting holes is arranged so as to be perpendicular to the optical axis of the movable lens unit, and the upper surface of the flat portion is inserted through the pair of mounting holes when the variable magnification optical device is mounted. Are provided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a variable power optical apparatus according to the present invention will be described with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, there is shown a schematic configuration of an embodiment of a variable magnification optical apparatus according to the present invention, which is incorporated in an electrophotographic copying machine. Is done. FIG. 1 illustrates a state where the copy magnification is 1.0, and FIG. 2 illustrates a state where the copy magnification is 2.0.

In FIGS. 1 and 2, reference numeral 11 denotes a glass plate defining a document reading surface of a copying machine, and a document placed on the glass plate 11 is illuminated by a light source (not shown). The reflected light reflected by the original is guided to an imaging lens 15 by mirrors 12, 13 and 14, and
The light passing through the imaging lens 15 is reflected by mirrors 16, 17 and 1.
8, the document is guided to the photosensitive surface of the photosensitive drum 19, whereby the document is formed as an optical image on the photosensitive surface.

The mirror 12 functions as a scanning mirror, and is moved in the direction of arrow D along the lower side of the glass plate 11. A first reflection mirror 13 for deflecting the reading light from the glass plate 11 downward is disposed on the reflection optical path of the reading scanning mirror 12.
On the reflected light path, a second light for deflecting the reflected light in the horizontal direction.
Are provided. First reflection mirror 13
And the second reflection mirror 14 is integrated as a movable mirror unit, and is movable in the direction of arrow D,
The moving speed is half of the moving speed of the scanning mirror 12. The reflecting surfaces of the mirrors 12, 13, and 14 extend so as to cover various document size widths, and their longitudinal axes are perpendicular to the paper surface of FIGS.

An imaging lens 15 having a fixed focal length is arranged on the reflection optical path of the second reflection mirror 14, and this imaging lens 15 moves along its optical axis, that is, along the direction of arrow D. It is possible. The imaging lens 15 is a component of the movable lens unit as described later.

On the optical axis of the imaging lens 15 and on the side opposite to the second reflection mirror 14, a third reflection mirror 16 is provided. The transmitted light is deflected downward. Below the third reflection mirror 16, a fourth reflection mirror 17 for returning the reflected light in the horizontal direction toward the imaging lens 15 is provided. The third reflection mirror 16 and the fourth reflection mirror 17 are integrated as a movable mirror unit as described later, and are movable in the direction of arrow D. A fifth reflection mirror 18 is provided on the reflection optical path of the fourth reflection mirror 17, and this fifth reflection mirror 18 is a component of a fixed mirror unit as described later. The fifth reflection mirror 18 reflects the light reflected from the fourth reflection mirror 17 toward the photosensitive surface of the photosensitive drum 19. In addition, each mirror 16, 17, 18
Also extends to cover the various document size widths, the longitudinal axis of which is perpendicular to the plane of the paper of FIGS.

As apparent from FIGS. 1 and 2, the movable lens unit including the imaging lens 15 and the movable mirror unit including the third reflection mirror 16 and the fourth reflection mirror 17 are positioned at a predetermined relative position to each other. When moved in this relationship, the magnification of the copy image formed on the photosensitive surface of the photosensitive drum 19 is changed. Although FIG. 2 shows an example in which the copy magnification is twice, a copy magnification of 1 or less can be obtained by appropriately changing the relative positional relationship between the two units.

Referring to FIGS. 3 to 6, there is shown a specific configuration of a variable power optical apparatus according to the present invention. FIG. 3 is a plan view of a variable power optical device according to the present invention, FIG. 4 is a sectional view taken along line AA in FIG. 3, and FIG. 5 is a sectional view taken along line BB in FIG. FIG. 6 is a cross-sectional view showing an enlarged main part of the present invention.

The variable power optical device includes a rectangular metal chassis 21 which can be obtained by, for example, press molding. The variable power optical apparatus includes a movable lens unit 22 mounted on a chassis 21. The movable lens unit 22 includes the above-described imaging lens 15 as one of its components. The movable lens unit 22 is composed of a long box-shaped frame 22a, and an imaging lens 15 is installed on the box-shaped frame 22a.
Are arranged such that their optical axes are perpendicular to the longitudinal direction of the box-shaped frame 22a.

At one end of the box-shaped frame 22a, a sliding sleeve 23 is integrally extended from the connecting piece 2.
The sliding sleeve 23 is slidably fitted to a first guide rod 24 provided along one side edge of the chassis 21. On the other hand, as shown in FIG. 5, a sliding shoe 22b made of a suitable low-friction material, for example, polyacetal is attached to the bottom of the other end of the box-shaped frame 22a. And slidably engage with the upper surface of the box-shaped frame 22a and support the other end of the box-shaped frame 22a.
Thus, the movable lens unit 22 is movable on the chassis 21 along the first guide rod 24, that is, along the optical axis of the imaging lens 15. The sliding sleeve 23
Can be constructed as a tubular body made of a suitable metal material coated with a low friction material resin such as polyacetal.

The movable lens unit 22 is moved by a driving mechanism generally indicated by reference numeral 31. The driving mechanism 31 controls a pulse motor 32 mounted on the lower surface of the chassis 21 and on the first guide rod 24 side. The output shaft 33 of the pulse motor 32 penetrates the chassis 21 and protrudes from the upper surface thereof. A gear 34 is fixed to the protruding end of the output shaft 33. The gear 34 is rotatably provided on the upper surface of the chassis 21. Outer peripheral teeth 35 of pulley 35
a. On the other hand, driven pulleys 36 and 37 are rotatably supported on both ends of the first guide rod 24 on the upper surface side of the chassis 21, and a driven wire 38 is connected to the driven pulleys 36 and 37 and the driving pulley 35.
Is wound, and a part of the drive wire 38 is connected to the sliding sleeve 23.

In short, the driving mechanism 31 of the movable lens unit 22 includes a pulse motor 32, a gear 34, a driving pulley 3
5, driven pulleys 36 and 37 and a driving wire 38, and the driving wire 38
Is driven along the first guide rod 24, the sliding sleeve 23 is moved along the first guide rod 24, and accordingly, the movable lens unit 22 is moved to the optical axis of the imaging lens 15. Moved along. The moving direction of the movable lens unit 22 is determined by the pulse motor 3
Needless to say, it depends on the direction of driving rotation of No. 2.

As shown in FIG. 3, the detection dog 3 is provided on the connecting piece 23a which is integrally extended from the sliding sleeve 23.
9 are provided. On the other hand, a bracket 40 is arranged on the upper surface of the corner upper surface of the chassis 21 on the side closer to the driven pulley 37, and an origin detecting sensor, for example, a photo interrupter type sensor 40a is provided on the lower surface of the bracket 40. It is attached. When the detected dog 39 is detected by the photo interrupter type sensor 40a while the movable lens unit 22 is being moved toward the photo interrupter type sensor 40a, the movable lens unit 22 is stopped, and the stop position is set to the movable lens. This is the origin position of the unit 22.

The variable power optical apparatus further includes a movable mirror unit 41 mounted on the chassis 21. The movable mirror unit 41 is the third mirror described above as one of its components.
And the fourth reflection mirror 17. The movable mirror unit 41 is a plate-like frame 4
The plate-shaped frame 42 extends in parallel to the box-shaped frame 22 a of the movable lens unit 22.

Vertical support plates 45 and 46 are attached to both ends of the plate-shaped frame 42, respectively. As is apparent from FIG. 4, almost the lower half of each of the vertical support plates 45 and 46 is formed on the chassis 21. Through the rectangular opening 25 (FIG. 3), it projects to the lower surface side of the chassis 21. The vertical support plates 45 and 46 have substantially the same configuration as each other, and
Is used to support the reflection mirror 16 and the fourth reflection mirror 17.

More specifically, as best shown in FIG. 6, a long hole 71 inclined at an angle of 45 ° with respect to the horizontal direction is formed on the upper side of each of the vertical support plates 45, 46, Both end portions of the reflection mirror 16 are inserted through the elongated holes 71. As shown in FIG. 6, a wedge-shaped leaf spring 73 is pushed into each long hole 71 on the back side of the third reflection mirror 16, so that each of both ends of the third reflection mirror 16 is inserted into the corresponding long hole 71. It is held elastically.

As shown in FIG. 6, a pair of positioning projections 72 are formed on one side edge of each long hole 71, that is, a side edge facing the reflection surface of the third reflection mirror 16, and a wedge-shaped leaf spring is formed. The reflection surface of the third reflection mirror 16 comes into contact with the pair of positioning projections 72 when the 73 is pushed in, so that the reflection surface of the third reflection mirror 16 can be properly positioned. That is, the pair of positioning projections 72 are
5 and 46 are disposed at predetermined distances along the horizontal direction from the rear ends 45a and 46a, so that the reflecting surface of the third reflecting mirror 16 is located at the rear end 45 of the vertical support plates 45 and 46.
a, 46a are positioned at predetermined positions with reference positions.

On the other hand, on the lower side of each of the vertical support plates 45 and 46, there is formed a long hole 74 inclined at an angle of 45 ° with respect to the horizontal direction and perpendicular to the long hole 71 on the upper side thereof. Both ends of the fourth reflection mirror 17 are inserted through the long holes 74. As shown in FIG. 6, a wedge-shaped leaf spring 76 is pushed into each long hole 74 on the back side of the fourth reflection mirror 17, so that each of both ends of the fourth reflection mirror 17 is inserted into the corresponding long hole 74. It is held elastically.

As shown in FIG. 6, a pair of positioning projections 75 are formed on one side edge of each long hole 74, that is, on the side edge facing the reflection surface of the fourth reflection mirror 17, and a wedge-shaped leaf spring is formed. The reflection surface of the fourth reflection mirror 17 abuts on the pair of positioning projections 75 at the time of pushing in 76, whereby the reflection surface of the fourth reflection mirror 17 is properly positioned.

As best shown in FIG. 4, a pair of spaced uprights 42a is formed on both sides of one end of the plate-shaped frame 42, and the pair of spaced uprights 42a are formed with insertion holes aligned with each other. Is formed and the sliding ring element 43 is attached. The pair of sliding ring elements 43 is the chassis 2
1 is slidably fitted to a second guide rod 44 provided on the opposite side to the first guide rod 24.
On the other hand, as shown in FIGS. 3 and 4, a sliding shoe 42b made of a suitable low-friction material such as polyacetal is attached to the bottom of the plate-shaped frame 42 at the other end. The slidably engages the upper surface of the chassis 21 and supports the other end of the plate-like frame 42. Thus, the movable mirror unit 41 becomes movable along the second guide rod 44 on the chassis 21. The sliding ring element 43 can be formed of, for example, a copper sintered material impregnated with a lubricating oil.

The movable mirror unit 41 is moved by a drive mechanism generally indicated by reference numeral 51. The drive mechanism 51 controls a pulse motor 52 mounted on the lower surface of the chassis 21 and on the second guide rod 44 side. Include. The output shaft 53 of the pulse motor 52 is
1 and protrudes from the upper surface thereof, and a gear 54 is fixed to the protruding tip.

On the other hand, the drive gear 5
5 and a drive pulley 56 are provided.
The drive pulley 56 has a coaxial structure and an integral structure. As is apparent from FIG. 3, the diameter of the drive gear 55 is larger than the diameter of the drive pulley 56. Also, the chassis 21
A first intermediate gear 57 and a second intermediate gear 58
The intermediate gears 57 and 58 are coaxial and integrated, and the diameter of the first intermediate gear 57 is larger than the diameter of the second intermediate gear 58. Pulse motor 5
The gear 54 provided on the second output shaft 53 is engaged with the first intermediate gear 57, and the second intermediate gear 58 is engaged with the drive gear 55.

Further, as shown in FIG. 3, a bracket 61 is provided on a corner upper surface of the chassis 21 and above a corner upper surface where one end of the second guide rod 44 is close. A guide pulley 62 is pivotally supported by the bracket 61 in such a manner that its rotation axis is horizontal. A drive wire 63 is wound between the guide pulley 62 and the above-described drive pulley 56, and both ends of the drive wire 63 are connected to the plate-like frame 42 of the movable mirror unit 41.
More specifically, one end of the drive wire 63 is connected to a first connection point 47 of the plate-shaped frame 42 via a coil spring 64, and the drive wire 63 extending therefrom is connected to a guide pulley 62.
After being wound about １ ／ times, the drive wire 63 is preferably wound a plurality of times, and then the other end of the drive wire 63 is connected to the second connection point 48 of the plate frame 42.

In short, the driving mechanism 51 of the movable mirror unit 41 includes a pulse motor 52, a gear 54, and a driving gear 5.
5, a driving pulley 56, a first intermediate gear 57, a second intermediate gear 58, a guide pulley 62, and a driving wire 63.
When 3 is driven, the movable mirror unit 41 is moved along the second guide rod 44. The moving direction of the movable mirror unit 41 is determined by the pulse motor 5.
It goes without saying that the opening 25 formed in the chassis 21 has a width corresponding to the moving range of the movable mirror unit 41, depending on the driving rotation direction of the movable mirror unit 41.

As shown in FIG. 3, the movable mirror unit 4
The detection dog 65 is provided on the upper surface of one end of the plate-shaped frame 42, that is, the end on the side where the pair of sliding rings 43 is provided.
The detected dog 65 is detected by an origin detection sensor, for example, a photo interrupter type sensor 66 provided on the lower surface of the bracket 61. When the detected dog 65 is detected by the photo interrupter type sensor 66 while the movable mirror unit 41 is moved toward the photo interrupter type sensor 66, the movable mirror unit 41 is stopped, and the stop position is set to the movable mirror. This is the origin position of the unit 41.

The variable power optical apparatus further includes a fixed mirror unit 67 mounted on the chassis 21. The fixed mirror unit 67 includes the above-described fifth mirror 18 as one of its components. . As is clear from FIG. 4, the fixed mirror unit 67 includes a long frame 68 fixed to the lower surface of the chassis 21, and the long frame 68 is attached to the imaging lens 1 of the movable lens unit 22.
5 are arranged at right angles to the optical axis. The fifth reflection mirror 18 is attached to the long frame 68,
The reflection mirror 18 is tilted so as to reflect the light reflected from the fourth reflection mirror 17 toward the photosensitive drum 19 (FIGS. 1 and 2).

According to the present invention, the side wall 79 stands upright from the side adjacent to the opening 25, which is the side of the chassis 21, and the upright side wall 79 is preferably formed of the imaging lens 15 of the movable lens unit 22. It is arranged so as to be perpendicular to the optical axis. A pair of positioning projection elements 80 and 81 are detachably attached to the upright side wall 79 so as to project from the inner wall surface.

In this embodiment, as is apparent from FIG. 3, the interval between the pair of positioning projection elements 80 and 81 is the same as the interval between the vertical support plates 45 and 46 of the movable mirror unit 41. When the unit 41 is moved to its origin position, the vertical support plate 45
And 46 at their rear ends 45a and 46a, respectively, against a pair of positioning projection elements 80 and 81. In such a contact state, the longitudinal axis along the reflecting surfaces of the third reflecting mirror 16 and the fourth reflecting mirror 17 is aligned with the imaging lens 1 of the movable mirror unit 41.
5 is perpendicular to the optical axis. That is, the straight line connecting the tips of the pair of positioning projection elements 80 and 81 is set to be perpendicular to the optical axis of the imaging lens 15.

Therefore, if the vertical support plates 45 and 46 are fixed to the pair of positioning projections 80 and 81 with set screws and the like,
The movable mirror unit 41 can be easily assembled so that the longitudinal axis along the respective reflecting surfaces of the third reflecting mirror 16 and the fourth reflecting mirror 17 is perpendicular to the optical axis of the image lens 15. Becomes The pair of positioning projection elements 80 and 81 are removed after the movable mirror unit 41 is assembled.

In the present invention, it is preferable that the projection length of at least one of the pair of positioning projection elements can be finely adjusted. In this embodiment, as best shown in FIG. The positioning projection element 81 is configured as a movable pin of the micrometer 82. According to such a configuration, the projecting position of the positioning projection element 81 can be easily set such that the straight line connecting the tips of the pair of positioning projection elements 80 and 81 is perpendicular to the optical axis of the imaging lens 15. Therefore, the manufacturing cost of the variable power optical device can be reduced.

The movable mirror unit 41 is assembled so that the longitudinal axes along the respective reflecting surfaces of the third reflecting mirror 16 and the fourth reflecting mirror 17 are perpendicular to the optical axis of the imaging lens 15. After that, the micrometer 82 and the positioning projection element 80 are removed together.
That is, the variable power optical device is incorporated in a copying machine or the like with the macrometer 82 removed therefrom, and the micrometer is used for adjusting the assembly of the movable mirror unit in another variable power optical device. The cost of the micrometer 82 is not included in the component cost of the doubler itself.

In the present invention, when the chassis 21 is bored in a pair of mounting holes 83 and 84 for fixing the chassis 21 to a machine frame (not shown) of the copying machine, the pair of mounting holes 83
It is preferable that the straight line connecting the lines 84 and 84 is perpendicular to the optical axis of the imaging lens 15 of the movable lens unit. That is, the movable pin of the micrometer 82, that is, the positioning projection element 81, is provided so as to obtain the parallelism of the straight line connecting the tip of the pair of positioning projection elements 80 and 81 with the straight line connecting the pair of mounting holes 83 and 84. This is because it is only necessary to finely adjust the length of the protrusion, and such fine adjustment can be performed very easily.

According to another aspect of the present invention, the assembling adjustment of the movable mirror unit 41 of the variable magnification optical apparatus can be performed using an assembling jig 85 as shown in FIG. When the assembling jig 85 is used, the chassis 21 of the variable power optical device is used.
The upright side wall 79 is eliminated or its height is reduced. As is apparent from FIG. 7, the pair of positioning projection elements 80 and 81 are not provided on the chassis 21 but provided on the assembly jig 85 side.

More specifically, the assembling jig 85 is formed of a rigid material such as a metal material such as aluminum or a hard plastic material, and has a rectangular flat portion 86 on which the chassis 21 is mounted, and a rectangular flat portion 86. And an upright side wall 87 upright from one side of the portion 86. A leg portion 86a extends from a square at the bottom of the rectangular flat portion 86, whereby the rectangular flat portion 86 is positioned at a predetermined level above the desk surface, for example. A pair of positioning projection elements 80 and 81 are attached to the upright side wall 87 of the assembly jig 85. The mounting manner of the pair of positioning projection elements 80 and 81 to the upright side wall 87 of the assembly jig 85 is the mounting of the pair of positioning projection elements 80 and 81 to the upright side wall 79 of the chassis 21 in the above-described embodiment. It is substantially the same as the embodiment.

As is apparent from FIG. 7, a pair of positioning pins 88 and 89 are implanted on the upper surface of the rectangular flat portion 86 of the assembling jig 85 along the side opposed to the upright side wall 87. A rectangular opening 90 is formed in the rectangular flat portion 86 so as to approach the upright side wall 87. When the variable magnification optical device is set on the mounting jig 85 for mounting the movable mirror unit 41, each of the pair of positioning pins 88 and 89 is inserted through the pair of mounting holes 83 and 84 of the chassis 21. The portion protruding from the bottom surface of the chassis 21, that is, the lower portion of the movable mirror unit 41, the fixed mirror unit 67, the pulse motor 32, and the like are accommodated in the rectangular opening 90, and the lower surface of the chassis 21 is rectangular. The upper surface of the flat portion 86 is made to coincide with the upper surface.

When the assembling jig 85 shown in FIG. 7 is used, the chassis 21 is mounted on a copier frame (not shown).
It is assumed that a straight line connecting a pair of mounting holes 83 and 84 for fixing the movable lens unit 22 to the movable lens unit 22 is perpendicular to the optical axis of the imaging lens 15 of the movable lens unit 22.

After the variable-magnification optical device is installed on the assembling jig 85 in the manner described above for assembling the movable mirror unit 41, when the movable mirror unit 41 is moved to its original position. , The vertical support plates 45 and 46 respectively abut their rear end portions 45a and 46a against a pair of positioning projection elements 80 and 81, at which time the third
The longitudinal axis along the reflecting surfaces of the reflecting mirror 16 and the fourth reflecting mirror 17 is perpendicular to the optical axis of the imaging lens 15 of the movable mirror unit 41. That is, the straight line connecting the tips of the pair of positioning projection elements 80 and 81 is perpendicular to the optical axis of the imaging lens 15 of the movable lens unit 21.

Therefore, as in the case of the previously described embodiment, the respective rear end portions 4 of the vertical support plates 45 and 46 are provided.
5a and 46a are abutted against the pair of positioning projections 80 and 81, and the vertical support plates 45 and 46 are set with set screws.
Is fixed, the movable mirror unit 41 is easily arranged such that the longitudinal axis along the respective reflecting surfaces of the third reflecting mirror 16 and the fourth reflecting mirror 17 is perpendicular to the optical axis of the imaging lens 15. It is possible to assemble them.

Even in the case of the assembling jig 85 as shown in FIG. 7, it is preferable that the projection length of at least one of the pair of positioning projection elements can be finely adjusted.
In the embodiment shown in FIG. 7, the positioning projection element 81 is configured as a movable pin of the micrometer 82. According to such a configuration, as in the case of the previous embodiment, the positioning projection elements are arranged such that the straight line connecting the tips of the pair of positioning projection elements 80 and 81 is perpendicular to the optical axis of the imaging lens 15. There is an advantage that the projecting position of 81 can be easily set.

As described in the embodiment described above,
The movable mirror unit 41 is assembled by being brought into contact with a pair of positioning projections 80 and 81 at its origin position, and this is a preferable form in terms of implementing the present invention. However, in order to assemble the movable mirror unit 41 at right angles to the optical axis of the imaging lens 15, it is not necessarily required that the assembly be performed at the origin position of the movable mirror unit 41. It is also possible to abut the pair of positioning projections 80 and 81 at positions other than the origin position and to assemble them.

[0055]

As described above, according to the present invention, the right angle between the longitudinal axis along the reflecting surface of the movable mirror unit and the optical axis of the imaging lens can be easily determined in the assembling step of the variable power optical device. Since the setting can be performed, the manufacturing cost of the variable power optical device can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a variable power optical system according to an embodiment of a variable power optical device according to the present invention, showing a state where the magnification of the variable power optical system is 1 ×.

FIG. 2 is a schematic diagram similar to FIG. 1, showing a state in which the magnification of the variable magnification optical system is doubled.

FIG. 3 is a plan view schematically showing an embodiment of a variable power optical device according to the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a side view taken along line BB in FIG. 3;

FIG. 6 is an enlarged sectional view showing a main part of the present invention.

FIG. 7 is a perspective view showing an assembling adjustment jig according to the present invention used when assembling the movable mirror unit to the variable power optical device.

[Explanation of symbols]

 Reference Signs List 15 imaging lens 16/17 reflection mirror 21 chassis 22 movable lens unit 41 movable mirror unit 80/81 positioning projection element 82 micrometer 83/84 mounting hole 85 assembly adjustment jig 88/89 positioning pin

Claims (13)

[Claims] 1. A variable power optical device incorporated in a copying machine, wherein the variable power optical device includes at least a movable lens unit and a movable mirror unit mounted on a chassis for changing a magnification of a copied image. The unit abuts a pair of positioning projection elements provided on the chassis at a predetermined position so that a longitudinal axis along a reflection surface of the movable mirror unit extends at right angles to an optical axis of the movable lens unit. A variable power optical device characterized by being regulated by: 2. The variable magnification optical apparatus according to claim 1, wherein a predetermined position at which the movable mirror unit is brought into contact with the pair of positioning projection elements is an origin position of the movable mirror unit. Variable power optical device. 3. A variable power optical apparatus according to claim 1, wherein at least one of said pair of positioning projection elements is configured to be able to finely adjust a projection length thereof. Optical device. 4. The variable power optical device according to claim 3, wherein at least one of the pair of positioning projection elements is configured as a movable pin of a micrometer, and the projection length is finely adjusted. Variable power optical device. 5. The variable power optical device according to claim 3, wherein, for the fine adjustment, a straight line connecting the tips of the pair of positioning projection elements is perpendicular to the optical axis of the movable lens unit. Variable magnification optical device characterized by being performed as follows. 6. The variable magnification optical apparatus according to claim 3, wherein the fine adjustment is performed by fixing a straight line connecting tips of the pair of positioning projection elements to the frame of the copying machine. A variable power optical device characterized in that it is performed so as to be parallel to a straight line connecting a pair of mounting holes formed in a chassis. 7. A variable power optical system incorporated in a copying machine, wherein at least a movable mirror unit and a movable lens unit are mounted on a chassis for changing a magnification of a copied image. An assembling adjustment jig used for assembling the movable mirror unit to a device, comprising: a flat portion on which the variable power optical device is mounted; and a flat portion provided at a predetermined height from the flat portion. A movable mirror unit of the variable power optical device mounted on the flat portion abuts on the pair of positioning projection elements at a predetermined position, and extends along a reflection surface of the movable mirror unit. An assembly jig, wherein a direction axis is regulated so as to extend at right angles to an optical axis of the movable lens unit. 8. The assembling adjustment jig according to claim 7, wherein said pair of positioning elements are attached to an upright side wall standing upright from said flat portion. 9. The assembly adjusting jig according to claim 7, wherein the predetermined position at which the movable mirror unit is brought into contact with the pair of positioning projection elements is an origin position of the movable mirror unit. Characteristic assembly adjustment jig. 10. The assembling adjustment jig according to claim 7, wherein at least one of said pair of positioning projection elements is capable of finely adjusting its projection length. An assembling adjustment jig characterized in that: 11. The assembly adjusting jig according to claim 10, wherein at least one of said pair of positioning projection elements is configured as a movable pin of a micrometer, and a projection length thereof is finely adjusted. Assembly adjustment jig to do. 12. The method according to claim 7, wherein:
Item, the fine adjustment is performed such that a straight line connecting the tips of the pair of positioning projection elements is perpendicular to the optical axis of the movable lens unit. Assembly adjustment jig to do. 13. The method according to claim 7, wherein:
In the assembling adjustment jig, the chassis has a pair of mounting holes formed in the chassis for fixing the chassis to a machine frame of a copying machine, and a straight line connecting the pair of mounting holes is formed by the movable lens. A pair of positioning pins are provided so as to be perpendicular to the optical axis of the unit, and are provided on the upper surface of the flat portion so as to be inserted into the pair of mounting holes when the variable magnification optical device is mounted. An assembly adjustment jig characterized by the following.