JPH0583752U - Optical scaling device - Google Patents

Abstract

(57) [Summary] [Purpose] To easily adjust the eccentricity of the movable lens of the zoom lens mounted on the carriage. [Structure] Middle lens holding cylinder 310 of zoom lens 16
Arms 330 and 333 are provided on the front lens group holding cylinder 320. The guide shaft 3 is provided on the carriage 200.
50 is provided and the arm slides along this guide shaft. One end of the guide shaft is the shaft fixing plate 3
The shaft fixing plate is displaced by the eccentric pin 352.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical zooming device, which is mounted on a copying machine or the like, for zooming an image of an object and projecting it on a light receiving means.

[0002]

[Background technology]

 Recent copying machines and the like are equipped with a scaling device for scaling and copying an image of an original. FIG. 10 is a conceptual diagram of a conventional slit scanning type color copying machine. Below the transparent plate glass 11 on which the document is placed, the illumination light source 12, the scanning plate 23 having the slits 23a, and the scanning mirrors 13 and 14 are arranged. To the solid line position. In the meantime, the incident light from the slit 23a is reflected by the scanning mirrors 13, 14 and then passes through the zoom lens 16 as an imaging lens, the color separation means 15 and the fixed mirrors 14a, 14b, 14c. Is projected onto the photosensitive drum 17.

The color separation means 15 includes four filters of M (monochrome), B (blue), G (green), and R (red), and these filters can be selectively inserted in the optical path. Thus, a color-separated image is formed on the photosensitive drum 17.

Around the photosensitive drum 17, charging means 18, developing means 19a, 19b, 19c, 19d for yellow, magenta, cyan, and black, and a transfer means 20 are arranged. , The latent image of each color formed on the photosensitive drum 17 is developed and transferred to the paper 21. The sheet 21 is conveyed by the sheet conveying device 22.

The zoom lens 16 is provided with three lens groups L1, L2, and L3. By changing the distance between these lens groups and moving the entire system, the object-image distance is increased. The imaging magnification is changed without changing.

FIG. 9 shows an example of a method of changing the distance between the lens groups of the zoom lens 16. That is, the holding barrel 31 of the middle group lens L2 is fixed to the outer barrel 30 with a fixing screw 34, and pins 35 and 36 are erected on the holding barrels 32 and 33 of the front and rear group lenses L1 and L3. Is engaged with a cam mechanism (not shown), and the cam mechanism is operated by the drive source to move the front lens group and the rear lens group L1 and L3 in the optical axis direction (37 is the positioning of the outer cylinder). Is a pin).

The lenses forming the lens groups L1, L2 and L3 have an error in lens processing. Therefore, after the zoom lens 16 is incorporated in the carriage, it is necessary to adjust the eccentricity of the lens group with respect to the optical axis to correct the image plane tilt or the like. As the eccentricity adjustment, in the zoom lens of FIG. 9, a notch 38 is formed in the outer cylinder 30, and the middle group lens holding frame 31 is rotated in the notch 38 to adjust the eccentricity.

The zoom lens shown in FIG. 9 is a system in which the front lens group L1 and the rear lens group L3 having a small lens configuration are displaced, and the middle lens group L2, which is the main component of the variable power function, is fixed. , The variable power efficiency is poor. Therefore, as proposed in Japanese Patent Application No. 3-226639 and Japanese Patent Application No. 3-2 68108, there is also a method of displacing the middle group lens L2 and the rear group lens L3 and fixing the front group lens L1 to the outer cylinder 30. .. However, in this method, the middle group lens L2 cannot be mechanically rotated, and therefore the fixed front group lens L1 must be rotated to adjust the eccentricity. Since the adjustment range is narrow, a sufficient eccentricity adjustment is possible. There is a problem that you can not do.

[0009]

[Problems to be solved by the device]

 The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it possible to easily perform eccentricity adjustment of a movable lens of an optical variable power device equipped in a copying machine or the like.

[0010]

[Means for Solving the Problems]

 A first means of the present invention for solving the above-mentioned problems is an optical variable power device including a lens and a carriage on which the lens is mounted, and a guide member extending in a lens optical axis direction of the carriage, An arm member provided on the lens is provided, and the arm member is configured to move along the guide member. A second means of the present invention is characterized in that an eccentricity adjusting means for a movable lens forming a lens is provided at an end portion of the guide member. According to a third means of the present invention, the eccentricity adjusting means fixes a one end portion of the guide member, and an eccentric pin for displacing the fixing member to tilt the guide member with respect to the optical axis. And a fixing member for fixing the fixing member to the carriage.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described as an example in which it is applied to the zoom lens 16 of the slit scanning type copying machine shown in FIG. 6 and 7 show a mechanical structure for driving the zoom lens 16, and the copying machine main body 100 has two guide rails extending in the optical axis direction of the zoom lens as shown in FIG. 101, 101 are arranged, the drive wheels 201, 201 rotate along the guide rails 101, 101, and the carriage 200 moves.

A main motor 210 and a sub motor 220 are provided on the carriage 200. The main motor 210 serves as a drive source for moving the entire carriage 200 and at the same time moving the middle group lens L2. The sub motor 220 serves as a drive source for moving the rear lens group L3.

The rotation of the main motor 210 is transmitted to a disc-shaped cam 230 provided at the center of the carriage 200 via an intermediate gear 211. The cam 230 is rotatably attached to the carriage 200 by a rotary shaft 230a, and a spiral cam groove 231 shown in FIG. 6 is formed on the upper surface thereof. Further, as shown in FIG. 7, a bobbin portion 233 is formed in the lower part of the cam 230, and a synchronizing wire 240 is installed between the bobbin portion 233 and the pulleys 203 and 204 to rotate the cam 230. The rotary shafts 202 of the drive wheels 201, 201 rotate in synchronization.

The rotation of the auxiliary motor 220 is transmitted to the fan gear 222 via the reduction gear 221. The fan gear 222 is pivotally attached to the carriage 200 by a rotating shaft 222a, and a long hole 222b that engages with the pin 321 of the rear lens group L3 is formed at the tip of the fan gear 222 to rotate the sub motor 220. Accordingly, the rear lens group L3 is displaced in the optical axis direction.

At the center of the carriage 200, a cylindrical outer cylinder 250 as shown in FIG. 7 is arranged, and inside the outer cylinder 250, as shown in FIG. The lens L2 and the rear lens group L3 are inserted. These lens groups are housed in holding cylinders 300, 310, 320, respectively, and the front lens group holding cylinder 300 is fixed to the outer cylinder 250 with fixing screws or the like.

A pin 311 that engages with the above-mentioned cam groove 231 is projected on the middle group lens holding barrel 310, and the middle group lens holding barrel 310 is moved inside the outer barrel 250 by the rotation of the main motor 210. Is to be displaced in the optical axis direction. Further, the above-described pin 321 is provided to project from the rear lens group holding cylinder 320, and the rear lens group holding cylinder 320 guides the light inside the outer cylinder 250 as the main fan gear 222 driven by the sub motor 220 rotates. It is designed to be displaced in the axial direction.

As shown in FIG. 4, an arm 330 having a shaft hole 330 a is provided in a protruding manner at a side portion of the middle group lens holding cylinder 310, and a guide pin is provided at a side portion opposite to the arm 330. 3 31 is projected. Further, as shown in FIG. 5, an arm 333 having a shaft hole 333a is projected on the side of the rear lens group holding cylinder 320, and a guide pin 334 is projected on the opposite side thereof.

As shown in FIGS. 1, 4 and 7, cutout grooves 251 and 251 a extending in the lengthwise direction of the outer cylinder are formed on both sides of the outer cylinder 250, and the middle group is formed in the cutout groove 251. The arms 330 and 333 of the lens holding cylinder 310 and the rear lens group holding cylinder 320 are engaged, and the guide pins 331 and 334 are engaged in the notch groove 215a.

As shown in FIG. 1, a guide shaft 350 is provided on the outer side of the outer cylinder 250 corresponding to the arms 330 and 333, and the middle group lens holding cylinder 310 is attached to the guide shaft 350. The shaft holes 330a and 333a of the arms 330 and 333 of the rear lens group holding cylinder 320 are slidably inserted. The guide shaft 350 extends parallel to the optical axis of the zoom lens 16, one end 350a thereof is fixed to the rear wall of the carriage 200, and the other end 350b thereof is fixed to the front wall of the shaft fixing plate 351. It is fixed to.

The shaft fixing plate 351 is a U-shaped metal fitting, and as shown in FIGS. 2 and 3, a long hole 351a is formed in the upper surface portion and a shaft fitting hole 351b is formed in the front and rear surface portions. The shaft fixing plate 351 is fixed to the side wall of the carriage 200 with a fixing screw 353, and the other end portion 350b of the shaft penetrates the front wall of the carriage and is fitted into the fitting hole 351b.

An eccentric pin 352 is rotatably inserted into the elongated hole 351a of the shaft fixing plate 351. A rotation shaft 352a of the eccentric pin 352 is mounted on the upper surface of the front wall of the carriage, and the rotation shaft 352a is displaced from the center position of the elongated hole 351a. Therefore, when the eccentric pin 352 is rotated, the pin peripheral end interferes with the long side portion of the elongated hole 351a and the shaft fixing plate 351 is displaced in the left-right direction. The amount of this displacement (the amount of eccentricity adjustment) is about 1 mm, and the hard synthetic resin that constitutes the carriage front wall can absorb this level of response, so that the distance between the other end 350b of the shaft and the carriage front wall is increased. In addition, there is no need to intentionally add play to the design.

Next, an operation example of the above-described embodiment will be described. First, the rotation of the main motor 210 is transmitted to the disc-shaped cam 230 via the intermediate gear 211. When the cam 230 rotates, the pulleys 203 and 204, the rotary shaft 202 and the drive wheels 201 and 201 rotate via the synchronous wire 240, and the entire carriage 200 moves along the guide rails 101 and 101. .. When the cam 230 rotates, the pin 311 of the middle group lens holding barrel 310 is engaged with the cam groove 231, so that the middle group lens L2 is displaced inside the outer barrel 250 in the optical axis direction.

The sub motor 220 rotates independently of the main motor 210, and by rotating the fan gear 222 via the reduction gear 221, the slot 222 and the pin 321 of the rear lens group holding cylinder 320 are rotated. The rear group lens L3 is displaced in the optical axis direction inside the outer cylinder 250 by the engagement with. The rotation of the main motor 210 and the sub motor 220 is controlled by a controller (not shown).

When the middle group lens holding barrel 310 and the rear group lens holding barrel 320 are displaced, the respective arms 330 and 333 are pivotally supported by the guide shaft 350, so that the middle group lens holding barrel 310 and the rear group lens holding barrel 310 are moved. The group lens holding cylinder 320 moves along the guide shaft 350. Further, since the guide pins 331 and 334 move by being guided by the cutout grooves 251a of the outer cylinder 250, movements in the circumferential axis direction when the middle group lens holding cylinder 310 and the rear group lens holding cylinder 320 are displaced are restricted. To be done.

The eccentricity adjustment of the lens is performed in the projection inspection process before the zoom lens 16 is attached to the main body of the copying machine. In the projection inspection, a chart is arranged in front of the zoom lens 16 and a screen is arranged in the rear, and the chart image formed on the screen is taken into consideration by the following method. Correct troubles.

First, the fixing screw 353 of the shaft fixing plate 351 is loosened in advance, and the eccentric pin 352 is rotated to displace the shaft fixing plate 351 in the left-right direction. Since one end 350a of the guide shaft 350 is fixed to the rear wall of the carriage, when the shaft fixing plate 351 is displaced, the entire guide shaft 350 tilts with respect to the optical axis of the zoom lens 16 with the one end 350a as a fulcrum. .. At the same time, the middle group lens holding barrel 310 and the rear group lens holding barrel 320 also tilt via the arms 330 and 333, so that the middle group lens L2 and the rear group lens L3 are decentered with respect to the optical axis. After adjusting the eccentricity in this way, the shaft fixing plate 351 is fixed to the front wall of the carriage with the fixing screw 353.

The reason why the surface tilt can be corrected simply by tilting the lens as described above is that in a slit scanning type copying machine, the document size is regulated by the slit width, so that the image is balanced only on a predetermined line. Because it is good.

In this embodiment, the rear lens group L3 is also provided with the arm 333 and guided by the guide shaft 350. However, instead of the arm 333 being a guide pin or the like, the arm 333 may be arranged along the cutout groove 51. However, in this case, it is possible to adjust the decentering of only the middle lens group L2.

The above-described embodiment is an example of the present invention, and the configuration of the shaft fixing plate of the eccentricity adjusting means shown in FIGS. 2 and 3, the mounting position, the mounting structure of the eccentric pin, and other details are not necessary. Can be changed. The configurations of the carriage drive mechanism, the drive mechanism of each lens group, and the like are not limited to those shown in the figures, and can be arbitrarily changed. Further, the present invention can be applied not only to a copying machine, but also to an optical zooming device used in other information equipment, medical equipment, and the like.

[0030]

[Effect of the device]

 According to the present invention described above, in an optical variable magnification device including a zoom lens and a carriage, it is possible to easily adjust the eccentricity of a movable lens that constitutes the zoom lens, and especially for a slit scanning type optical device. It is useful as a variable power device.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an optical variable power device showing an embodiment of the present invention.

FIG. 2 is a schematic plan view showing an example of the eccentricity adjusting means of the present invention.

FIG. 3 is a schematic front view showing an example of the eccentricity adjusting means of the present invention.

FIG. 4 is a partial cross-sectional front view schematically showing a middle group lens housing cylinder and an outer cylinder according to an embodiment of the present invention.

FIG. 5 is a schematic front view of a rear lens group storage cylinder showing an embodiment of the present invention.

FIG. 6 is a schematic plan view of a carriage showing an embodiment of the present invention.

FIG. 7 is a schematic front view of a carriage showing an embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of a zoom lens structure showing an embodiment of the present invention.

FIG. 9 is a schematic explanatory view of a conventional zoom lens.

FIG. 10 is a schematic explanatory view of a conventional slit scanning copying machine.

[Explanation of sign]

 16 zoom lens 4 switch contact piece 200 carriage 210 main motor 220 sub motor 222 fan-shaped cam 230 disc-shaped cam 231 cam groove 250 outer cylinder 251 cutout groove 251a cutout groove 300 front group lens holding tube 310 middle group lens holding Tube 320 Rear group lens holding tube 330 Arm 333 Arm 350 Guide shaft 351 Shaft fixing plate 351a Long hole 352 Eccentric pin 353 Fixing screw

Claims (3)

[Scope of utility model registration request] 1. An optical variable magnification device comprising a lens and a carriage on which the lens is mounted, a guide member extending in a lens optical axis direction of the carriage, and an arm member provided on the lens. And an arm member that is configured to move along the guide member. 2. The optical variable power device according to claim 1, wherein an eccentricity adjusting means for a movable lens forming a lens is provided at an end portion of the guide member. 3. The eccentricity adjusting means includes a fixing member for fixing one end of the guide member, an eccentric pin for displacing the fixing member to tilt the guide member with respect to an optical axis, and the fixing member. The optical scaling device according to claim 2, further comprising a fixing member for fixing the carriage to the carriage.